KR20150075008A - Cleaner - Google Patents

Abstract

Disclosed is a vacuum cleaner having an improved structure for improving cleaning performance. The vacuum cleaner according to the present invention includes a suction unit for generating a suction force for sucking air into the main body. The suction unit includes a rotatable impeller, an impeller cover having an inlet port, And a return channel coupled to the impeller cover to receive the impeller, wherein the return channel includes an inner frame and an outer frame located outside the inner frame to be spaced apart from the inner frame And a plurality of blades are disposed between the inner frame and the outer frame.

Description

Cleaner {CLEANER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner, and more particularly, to a vacuum cleaner having an improved structure for improving cleaning performance.

Generally, a vacuum cleaner sucks air containing dirt on a surface to be cleaned, separates and collects dirt from the air, and discharges the purified air to the outside of the main body.

Such a cleaner is divided into a canister type in which the main body and the suction nozzle are separated from each other by a predetermined pipe, and an up-right type in which the suction nozzle and the main body are provided in one.

In recent years, a robot cleaner has been spotlighted for automatically cleaning an area to be cleaned by suctioning foreign substances such as dust from the floor surface while traveling the area to be cleaned without user's operation.

The cleaner is a component that determines the suction force and may include an impeller, a diffuser, and a deswirler.

The air sucked into the main body flows through the impeller, the diffuser, and the superfluidizer in turn along the bent flow path several times. In this process, the pressure loss of the air increases, and the spacing between the impeller and the diffuser is designed to be narrow to compensate for the reduction of the suction force due to the pressure loss. However, as the gap between the impeller and the diffuser is narrowed, noise due to pressure perturbation may occur. In order to prevent noise, the size of the motor coupled to the impeller and the impeller can be increased, but the size of the cleaner is also increased, so that it does not meet the recent market trend requiring a compact product.

One aspect of the present invention provides a vacuum cleaner having an improved structure for improving a suction force.

Another aspect of the present invention provides a vacuum cleaner having an improved structure capable of miniaturization and compacting.

Another aspect of the present invention provides a vacuum cleaner having an improved structure to prevent noise.

Another aspect of the present invention provides a vacuum cleaner having an improved structure for facilitating manufacture.

The vacuum cleaner according to the present invention includes a suction unit for generating a suction force for sucking air into the main body. The suction unit includes a rotatable impeller, an impeller cover having an inlet port, And a return channel coupled to the impeller cover to receive the impeller, wherein the return channel includes an inner frame and an outer frame located outside the inner frame to be spaced apart from the inner frame And a plurality of blades are disposed between the inner frame and the outer frame.

The return channel may be directly connected to the impeller so that air passing through the impeller may be introduced.

The plurality of blades may form an inclination with respect to the axial direction (X) of the impeller.

The impeller rotates in a first direction (H) and the plurality of blades are inclined in a second direction (I) opposite to the first direction (H) with respect to the axial direction (X) of the impeller .

The plurality of blades may include a curved surface.

Wherein the plurality of blades are spaced apart from each other to form an exhaust passage through which the air having passed through the impeller moves, the exhaust passage having an inlet formed at one end portion facing the impeller and an outlet formed at another end portion spaced apart from the inlet portion And the air introduced into the discharge passage through the inlet is discharged to the outside of the suction unit through the outlet.

The impeller cover includes a guide portion coupled to the outer frame to guide the air passing through the impeller to the inlet, and the guide portion may have a curved surface.

The guide portion may be convex toward the outside of the impeller cover, and may have a curved surface having a radius of curvature of 1 mm or more.

Wherein the plurality of vanes face the outer surface of the inner frame and have a first surface including a starting point M and a starting point N facing the inner surface of the outer frame and forming the inlet with the starting point M, And a second surface including the second surface.

The straight line A connecting the starting point M of the first surface and the starting point N of the second surface may form an inclination of 5 to 85 에 with respect to the axial direction X of the impeller .

On one end of the first surface facing the impeller cover and on one end of the second surface facing the impeller cover on a cross section Q of the return channel cut in a horizontal direction Y perpendicular to the axial direction X of the impeller, And the straight line connecting the center of the return channel and the one end of the first surface facing the impeller cover is not less than 0 and not more than 80 ㅀ .

The starting point N of the second surface may be further extended toward the impeller cover than the starting point M of the first surface.

The plurality of blades may further include a connecting portion connecting a starting point (M) of the first surface and a starting point (N) of the second surface, and the connecting portion may include at least one of a curved surface and a flat surface.

The connecting portion may include a peak that further extends toward the impeller cover than at least one of a starting point (M) of the first surface and a starting point (N) of the second surface.

The suction unit may further include a motor provided inside the return channel, having a motor shaft coupled with the impeller to provide a driving force for rotating the impeller.

The vacuum cleaner according to the present invention includes a suction unit for generating a suction force for sucking air into the main body. The suction unit includes a rotatable impeller, an impeller cover having an inlet port, And a return channel coupled to the impeller cover to receive the impeller and directly connected to the impeller to allow air passing through the impeller to flow therethrough, wherein the return channel includes a plurality of units detachable from each other, Is formed.

And the plurality of units are separable so as to form an inclination with respect to the axial direction (X) of the impeller.

And the plurality of units are separable in a horizontal direction (Y) perpendicular to the axial direction (X) of the impeller.

The return channel may include an inner frame, an outer frame positioned outside the inner frame to be spaced apart from the inner frame, and a plurality of blades disposed between the inner frame and the outer frame, , And the plurality of units are separable in a horizontal direction (Y) perpendicular to the axial direction (X) of the impeller.

The plurality of blades may form a slope with respect to the axial direction (X) of the impeller, and may include a curved surface.

The return channel may further include at least one anti-rotation unit coupling the plurality of units.

The at least one anti-rotation unit may be formed inside the return channel to be spaced apart from each other.

Wherein the plurality of units includes a first unit positioned on an upstream side of a direction (G) in which air passing through the impeller moves, and a second unit positioned on a downstream side of a direction (G) And the at least one rotation preventing unit may include a protrusion provided inside one of the first unit and the second unit.

The at least one rotation preventing unit may further include a fastening part provided inside the other one of the first unit and the second unit and detachably coupled to the projection.

The vacuum cleaner according to the present invention includes a suction unit for generating a suction force for sucking air into the main body. The suction unit includes a rotatable impeller, an impeller cover having an inlet port, And a return channel coupled to the impeller cover to receive the impeller and directly connected to the impeller so that air passing through the impeller can be introduced into the impeller, A plurality of vanes may be disposed to form an inclination with respect to the base.

The plurality of blades may include a curved surface.

The impeller rotates in a first direction (H) and the plurality of blades are inclined in a second direction (I) opposite to the first direction (H) with respect to the axial direction (X) of the impeller .

Wherein the return channel includes an inner frame and an outer frame positioned outside the inner frame so as to be spaced apart from the inner frame, and the plurality of blades are disposed between the inner frame and the outer frame .

The bent shape of the flow path can be reduced and the pressure loss of the air can be reduced by arranging a plurality of vanes that form a slope in the return channel with respect to the axial direction X of the impeller to improve the suction force of the vacuum cleaner have.

By using a return channel that also serves as a diffuser, the gap between the return channel and the impeller can be increased above the gap between the existing diffuser and the impeller, thereby reducing the noise of the vacuum cleaner caused by pressure perturbations.

The suction force of the vacuum cleaner can be improved and the size of the vacuum cleaner can be reduced by using the return channel in which a plurality of vanes forming an inclination with respect to the axial direction X of the impeller are disposed.

By combining a plurality of detachable units to form a return channel, it is possible to improve the ease of manufacturing or mass production of the vacuum cleaner.

1 is a view showing an appearance of a vacuum cleaner according to an embodiment of the present invention;
2 is a plan view showing a state in which the outer housing of the second housing of the vacuum cleaner according to the embodiment of the present invention is removed;
3 is a plan view showing a state in which the outer housing and the dust container of the first housing and the second housing of the vacuum cleaner according to the embodiment of the present invention are removed;
4 is a perspective view illustrating a suction unit of a vacuum cleaner according to an embodiment of the present invention.
5 is an exploded perspective view of the suction unit of the vacuum cleaner according to the embodiment of the present invention.
6 is a top view of a suction unit of a vacuum cleaner according to an embodiment of the present invention.
7 is a view showing a plurality of vanes provided on a return channel in a suction unit of a vacuum cleaner according to an embodiment of the present invention;
8 is a view illustrating a suction unit of a vacuum cleaner according to an embodiment of the present invention, in which a plurality of blades and at least one sub-
9 is a front view of the suction unit of the vacuum cleaner according to the embodiment of the present invention.
10 is an enlarged cross-sectional view of a part of the suction unit of the vacuum cleaner according to the embodiment of the present invention.
Fig. 11 is a view of the suction unit of the vacuum cleaner according to the embodiment of the present invention, showing the first unit of the return channel
12 shows a suction unit of a vacuum cleaner according to an embodiment of the present invention,
13A and 13B are cross-sectional views showing the coupling structure of the first unit and the second unit of the return channel in the suction unit of the vacuum cleaner according to the embodiment of the present invention
14 is a view showing a structure including a nosecone in a suction unit of a vacuum cleaner according to an embodiment of the present invention
15 is a view showing the appearance of a vacuum cleaner according to another embodiment of the present invention
16 is a cross-sectional view showing the main body of the vacuum cleaner according to another embodiment of the present invention
17 is a perspective view showing a suction unit of a vacuum cleaner according to another embodiment of the present invention.
18 is an exploded perspective view of the suction unit of the vacuum cleaner according to another embodiment of the present invention.
19 is an enlarged perspective view of a suction unit of a vacuum cleaner according to another embodiment of the present invention.
20 is a sectional view of the suction unit of the vacuum cleaner according to another embodiment of the present invention
21 is an enlarged cross-sectional view of a part of the suction unit of the vacuum cleaner according to another embodiment of the present invention
22 is an enlarged cross-sectional view of another portion of the suction unit of the vacuum cleaner according to another embodiment of the present invention;
23 is a view showing a part of a plurality of vanes arranged between an inner frame and an outer frame in a vacuum cleaner according to another embodiment of the present invention
24A to 24P schematically show various shapes of connection portions of the plurality of blades of Fig. 23 from the side; Fig.
25 is a side view of the suction unit of the vacuum cleaner according to another embodiment of the present invention
26 is a cross-sectional view of an enlarged view of a plurality of vanes inclined in the same direction as the direction of rotation of the impeller, according to another embodiment of the present invention.
27 is a cross-sectional view of an enlarged view of a plurality of vanes inclined in a direction opposite to the rotating direction of the impeller, according to another embodiment of the present invention.
28 is a perspective view showing a first embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention.
29 is a perspective view showing a second embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention.
Fig. 30 is a sectional view showing a second embodiment of the cooling structure of Fig. 29
31 is a sectional view showing a third embodiment of the cooling structure of a vacuum cleaner according to another embodiment of the present invention
32 is a sectional view showing a fourth embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention
33 is a cross-sectional view showing a fifth embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention
34 is a cross-sectional view showing a first embodiment of the arrangement structure of a plurality of vanes in a vacuum cleaner according to another embodiment of the present invention
Fig. 35 is a partial plan view of Fig. 34 taken along the horizontal direction (Y)
36 is a view showing a second embodiment of the arrangement structure of a plurality of vanes in a vacuum cleaner according to another embodiment of the present invention
37 is a view showing a third embodiment of the arrangement structure of a plurality of vanes in a vacuum cleaner according to another embodiment of the present invention
38 is a sectional view of the suction unit of the vacuum cleaner according to another embodiment of the present invention
39 is a cross-sectional view illustrating a main body of a vacuum cleaner according to another embodiment of the present invention
40 is a perspective view showing a suction unit of a vacuum cleaner according to another embodiment of the present invention;
41 is an exploded perspective view of the suction unit of the vacuum cleaner according to another embodiment of the present invention.
42 is an enlarged perspective view of a suction unit of a vacuum cleaner according to another embodiment of the present invention.
43 is a sectional view of the suction unit of the cleaner according to another embodiment of the present invention
FIG. 44 is an enlarged cross-sectional view of a suction unit of a vacuum cleaner according to another embodiment of the present invention; FIG.
45 is an enlarged cross-sectional view of a plurality of wings of a cleaner according to another embodiment of the present invention;
FIG. 46 is a view showing the inclination of the impeller of the straight line A connecting the starting point M of the first surface and the starting point N of the second surface with respect to the axial direction X and the suction force of the cleaner according to the embodiment of the present invention Graph showing the relationship between
Fig. 47 is a cross-sectional view showing a cross section Q on which a return channel is cut in a horizontal direction Y perpendicular to the axial direction X of the impeller, and a straight line B connecting one end of the first surface and one end of the second surface ) And the straight line C connecting the center of the return channel and one end of the first surface and the suction force of the vacuum cleaner according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The terms "tip", "rear end", "upper", "lower", "upper" and "lower", etc. used in the following description are defined with reference to the drawings, Is not limited.

1 is a view showing an appearance of a vacuum cleaner according to an embodiment of the present invention.

As shown in FIG. 1, the vacuum cleaner may include a robot cleaner 1000. The robot cleaner 1000 may include a main body forming an outer appearance and a housing 300 forming at least a part of an outer appearance of the main body.

The housing 300 may include a first housing 400 formed on the front side and a second housing 500 formed on the rear side of the first housing 400. A connecting member 600 connecting the first housing 400 and the second housing 500 may be positioned between the first housing 400 and the second housing 500.

The second housing 500 may be coupled with a dust collecting unit 530 configured to store dust. The dust collecting unit 530 may include a suction unit 100 that provides power for sucking dust, and a dust collecting box 510 that stores sucked dust.

The dust collecting container 510 may be provided with a grasping portion 511 which is recessed to be grasped by a user. The user can grasp the grasping portion 511 and rotate the dust collecting container 510 to separate the dust collecting container 510 from the second housing 500. [ The user can remove accumulated dust in the dust collecting container 510 by separating the dust collecting container 510. A driving unit for driving the main body may be provided on a side surface of the second housing 500. The drive unit may include a drive wheel 540 for running the main body and a roller (not shown) provided so as to be rotatable to minimize the running load of the main body. The driving wheel 540 may be coupled to both sides of the second housing 500.

The first housing 400 may be provided with a brush unit (not shown) configured to sweep dust on the floor. A bumper 700 for relieving noise and impact generated when the robot cleaner 1b bumps against a wall surface during traveling of the robot cleaner 1b may be coupled to a front portion of the first housing 400. [ Further, a separate buffer member 710 may be coupled to the bumper 700.

An entrance shutoff sensor 720 may protrude from the upper surface of the first housing 400. The entrance blocking sensor 720 detects the infrared ray and can prevent the robot cleaner 1b from entering the predetermined section. The entrance blocking sensor 720 may be provided on both sides of the first housing 400.

FIG. 2 is a plan view showing a state where the outer housing of the second housing of the vacuum cleaner according to the embodiment of the present invention is removed, FIG. 3 is a side view of the first and second housings of the vacuum cleaner according to the embodiment of the present invention, Fig. 6 is a plan view showing a state where the housing and the dust container are removed. Fig.

As shown in FIGS. 2 and 3, a power supply unit 550 for supplying power for driving the main body can be coupled to the inside of the second housing 500. The power supply unit 550 may include a battery (not shown), a main board 551, and a display unit (not shown) positioned above the main board 551 and displaying the state of the robot cleaner 1000 have. The power source unit 550 may be disposed behind the dust collecting unit 530.

The battery (not shown) is provided with a rechargeable secondary battery. When the main body completes the cleaning process and is coupled to a docking station (not shown), the battery is charged with power from a docking station (not shown).

When the dust collecting container 510 is removed, a blowing fan (not shown) for sucking the dust and moving the dust container 510 into the dust collecting container 510 may be provided. Dust is accumulated in the dust collecting box 510 due to the operation of the blowing fan, and the user can easily remove the dust by separating the dust collecting box 510.

The suction unit 100b may be located inside the suction unit housing (not shown). The suction unit 100b may be coupled to the side surface of the dust collecting container 510. [ According to one embodiment of the present invention, the driving wheel 540 may be disposed on each side of the dust collecting container 510 and the suction unit 100b. That is, the driving wheel 540 may include a first driving wheel 541 and a second driving wheel 542. The first driving wheel 541 may be disposed on the side of the suction unit 100b and the second driving wheel 542 may be disposed on the side of the dust collecting container 510. [

Accordingly, the dust collecting container 510, the suction unit 100b, and the driving wheel 540 can be disposed in the lateral direction of the main body. That is, the dust collecting container 510, the suction unit 100b, and the driving wheel 540 may be arranged close to a straight line.

Details of the suction unit 100b will be described later.

FIG. 4 is a perspective view illustrating a suction unit of a vacuum cleaner according to an embodiment of the present invention, and FIG. 5 is an exploded perspective view of a suction unit of a vacuum cleaner according to an embodiment of the present invention. 6 is a top view of a suction unit of a vacuum cleaner according to an embodiment of the present invention.

4 to 6, the robot cleaner 1000 may include a suction unit 100b for generating a suction force for sucking outside air into the main body.

The suction unit 100b may include an impeller 110, an impeller cover 120, and a return channel 130b.

The impeller cover 120 may have an air inlet 121 formed therein.

The rotatable impeller 110 may be provided inside the impeller cover 120.

The impeller 110 is connected to the motor 140 and rotates to suck air into the suction unit 100b.

The impeller 110 may be a centrifugal fan that sucks air in the axial direction X of the impeller 110 and discharges the air in a radial direction.

The impeller 110 may include a first plate 111, a second plate 112, and a plurality of rotating blades 113.

The first plate 111 and the second plate 112 may be arranged to face each other and a plurality of rotating blades 113 may be disposed between the first plate 111 and the second plate 112 have.

The upper surface of the plurality of rotary blades 113 is coupled to the first plate 111 located above the plurality of rotary blades 113 and the lower surface of the plurality of rotary blades 113 is coupled to a lower portion of the plurality of rotary blades 113 And the second plate 112 is positioned. Therefore, the first plate 111, the second plate 112, and the plurality of rotary vanes 113 can rotate integrally.

The first plate 111 may have an opening 114 corresponding to the inlet 121 of the impeller cover 120. The air that has passed through the inlet 121 can be introduced into the impeller 110 through the opening hole 114. [

One end of the motor shaft 141 may be fixed to the second plate 112. Accordingly, the first plate 111, the second plate 112, and the plurality of rotary blades 113 can rotate integrally with the motor shaft 141 as a center.

A plurality of rotary blades 113 positioned between the first plate 111 and the second plate 112 may be formed to define a flow path 115 so as to be spaced apart from each other. The air that has passed through the opening hole 114 and flows into the impeller 110 moves along the flow path 115 and is transferred to the discharge path 161 formed in the return channel 130b.

The impeller 110 may include a 3D impeller including a body and a blade having a shape that is gradually lowered in the radial direction.

The shape of the impeller 110 may be variously modified and is not limited to the above example.

The return channel 130b serves to convert the kinetic energy of the air drawn into the suction unit 100b by the impeller 110 into pressure energy. Specifically, the air introduced into the impeller 110 through the opening hole 114 is transmitted to the return channel 130b after rotating. The return channel 130b collects the air that has passed through the impeller 110 and converts the dynamic pressure to a static pressure. In addition, the return channel 130b may prevent noise that may occur during the passage of air through the suction unit 100b. That is, the return channel 130b may serve both as a diffuser and as a deswirler.

The return channel 130b may be coupled with the impeller cover 120 to define an impeller receiving space 134 therein for receiving the impeller 110 therein.

The return channel 130b may be disposed below the impeller 110.

The return channel 130b may be directly connected to the impeller 110 so that air passing through the impeller 110 can be directly introduced into the return channel 130b.

The return channel 130b is detachable. That is, the return channel 130b may be formed by combining a plurality of units 139a and 139b which are detachable from each other.

The plurality of units 139a and 139b are detachable to form an inclination with respect to the axial direction X of the impeller 110. [ The plurality of units 139a and 139b may be separated in the horizontal direction Y perpendicular to the axial direction X of the impeller 110. [

The plurality of units 139a and 139b may include a first unit 139a and a second unit 139b.

The first unit 139a is located on the upstream side of the direction G in which the air passing through the impeller 110 moves and the second unit 139b is located on the upstream side in the direction G in which the air passing through the impeller 110 moves. As shown in FIG.

The first unit 139a can engage with the impeller cover 120. The second unit 139b may be coupled to the lower portion of the first unit 139a so as to be detachable.

The first unit 139a and the second unit 139b may be combined to form a step.

The second unit 139b may have a wider width than the first unit 139a. That is, the second unit 139b may protrude further outward in the horizontal direction Y, which is perpendicular to the axial direction X of the impeller 110, than the first unit 139a.

The plurality of units 139a and 139b are not limited to the first unit 139a and the second unit 139b.

The return channel 130b may include an inner frame 131, an outer frame 132 and a plurality of blades 160. [

The outer frame 132 may be located outside the inner frame 131 along the outer circumferential surface of the inner frame 131 and may be coupled with the impeller cover 120 to form an impeller accommodation space 134 for receiving the impeller 110 have.

The return channel 130b may be positioned below the impeller 110 and a seating portion 133 may be formed on the upper surface of the inner frame 131 to mount the impeller 110 thereon. That is, the seating portion 133 on which the impeller 110 is mounted may be formed on the upper surface of the inner frame 131 of the first unit 139a.

The inner frame 131 and the outer frame 132 may be integrally formed.

The plurality of blades 160 may be arranged long between the inner frame 131 and the outer frame 132. The plurality of blades 160 may be formed to be long between the inner frame 131 and the outer frame 132 along the axial direction X of the impeller 110. The plurality of blades 160 can form the discharge flow path 161 extending in the axial direction X of the impeller 110 and can raise the additional static pressure to improve the suction performance of the suction unit 100b .

A detailed description of the plurality of blades 160 will be described later.

The suction unit 100b may further include a printed circuit board 210 and a support unit 200.

The printed circuit board 210 may be positioned below the return channel 130b in the axial direction X of the impeller 110. That is, the printed circuit board 210 may be positioned below the return channel 130b so as to be adjacent to the outlet 135 of the discharge flow path 161. [ The printed circuit board 210 may be positioned at the inner lower portion of the return channel 130b so as not to block the discharge path 161. [

The support unit 200 may be positioned below the printed circuit board 210 in the axial direction X of the impeller 110. The support unit 200 supports the motor 140 and the printed circuit board 210 provided in the return channel 130b at the lower portion of the return channel 130b.

The support unit 200 can be coupled to at least one protrusion 220 formed inside the return channel 130b by the fixing member 960. [

The width of the return channel 130b may be wider than the width of the impeller 110.

The width of the return channel 130b across the outer frame 132 in the horizontal direction Y perpendicular to the axial direction X of the impeller 110 The width of the impeller 110 across the impeller 110 in the horizontal direction Y perpendicular to the axial direction X of the impeller 110 Quot;). ≪ / RTI >

The width (Z) of the impeller may correspond to 70% to less than 100% of the width (W) of the return channel. Specifically, the diameter of the second plate 112 of the impeller 110 may correspond to 70% or more and less than 100% of the diameter of the outer frame 132 of the return channel 130b.

When the width Z of the impeller and the width W of the return channel are equal, that is, when the width Z of the impeller corresponds to 100% of the width W of the return channel, the air passing through the impeller 110 Is difficult to be transmitted to the discharge passage 161 formed in the return channel 130b.

The distance between the second plate 112 of the impeller 110 and the outer frame 132 of the return channel 130b may be 4 mm or more and 8 mm or less. This can be variously modified depending on the shape and size of the suction unit 100b.

The suction unit 100b may further include a motor 140 that provides the impetus for the impeller 110 to rotate.

The motor 140 may include a BLDC motor, a DC motor, and an AC motor.

The motor 140 may be provided inside the return channel 130b. Specifically, the motor 140 may be provided inside the inner frame 131.

The motor 140 may include a motor shaft 141. One end of the motor shaft 141 is connected to the second plate 112 of the impeller 110 and the other end of the motor shaft 141 is connected to the motor 140.

A motor shaft through hole 136 is formed in the seat 133 of the inner frame 131 so that one end of the motor shaft 141 is connected to the second plate 112 of the impeller 110 located above the inner frame 131. [ May be formed.

FIG. 7 is a view showing a plurality of vanes provided on a return channel in a suction unit of a vacuum cleaner according to an embodiment of the present invention, FIG. 8 is a view illustrating a suction unit of a vacuum cleaner according to an embodiment of the present invention, A plurality of wings provided on the return channel and at least one sub-wing. 7 and 8, the outer frame 132 of the return channel 130b is omitted for convenience of explanation. Reference numerals not shown refer to Figs. 1 to 6.

As shown in FIGS. 7 and 8, a plurality of vanes 160 may be disposed in the return channel 130b.

The plurality of blades 160 may be formed long between the inner frame 131 and the outer frame 132 along the axial direction X of the impeller 110, as described above.

The plurality of blades 160 may be disposed on the return channel 130b to form an inclination with respect to the axial direction X of the impeller 110. [ Specifically, the plurality of blades 160 may be arranged to form a slant between the inner frame 131 and the outer frame 132. [

The plurality of blades 160 may be spaced apart from each other and disposed between the inner frame 131 and the outer frame 132. The plurality of vanes 160 spaced apart from each other can form a discharge passage 161 through which the air passing through the impeller 110 moves.

The discharge flow path 161 may include an inlet 137 and an outlet 135. The inlet 137 of the discharge passage 161 is connected to the upper end of the discharge passage 161 facing the impeller 110 so that the air having passed through the impeller 110 can be introduced into the discharge passage 161 through the inlet 137 . The outlet 135 of the discharge passage 161 is formed at the lower end of the discharge passage 161 so that air moving along the discharge passage 161 can be discharged to the outside of the suction unit 100b through the outlet 135 .

The distance between the vanes 160 can be increased toward the outlet 135 of the discharge passage 161. That is, the width of the discharge flow path 161 can be wider as it gets closer to the outlet 135.

The plurality of blades 160 may include a first surface 162 and a second surface 163.

The first surface 162 may face the outer surface of the inner frame 131 and the second surface 163 may face the inner surface of the outer frame 132. The first surface 162 may include a starting point M located at the upper end of the first surface 162. The second surface 163 may include a starting point N located at an upper end of the second surface 163. The starting point N of the second surface 163 may form the inlet 137 of the discharge flow path 161 together with the starting point M of the first surface 162.

The plurality of vanes 160 forming the inlet 137 of the discharge flow passage 161 can be inclined by 0 to 90 degrees with respect to the axial direction X of the impeller 110. [ Specifically, the angle? Formed by the second surface 163 of the plurality of blades 160 forming the inlet 137 of the discharge flow passage 161 with respect to the axial direction X of the impeller 110 is 0 占More than 90..

Or an angle formed by a tangent of the plurality of vanes 160 forming the inlet 137 of the discharge passage 161 with respect to the axial direction X of the impeller 110 may be 0 to 90 degrees .

The plurality of vanes 160 forming the outlet 135 of the discharge passage 161 can be inclined by 0 to 90 degrees with respect to the axial direction X of the impeller 110. [ Specifically, the angle? Formed by the second surface 163 of the plurality of blades 160 forming the outlet 135 of the discharge flow passage 161 with respect to the axial direction X of the impeller 110 is 0 占More than 90..

The angle θ formed by the tangents of the plurality of vanes 160 forming the outlet 135 of the discharge passage 161 with respect to the axial direction X of the impeller 110 may be 0 to 90 ° .

The first surface 162 of the plurality of vanes 160 may be coupled to the outer surface of the inner frame 131 and the second surface 163 of the plurality of vanes 160 may be coupled to the inner surface of the outer frame 132. [ .

The plurality of blades 160 may include a curved surface.

The direction in which the plurality of blades 160 are tilted is related to the rotating direction of the impeller 110. More specifically, when the impeller 110 rotates in the first direction H, the plurality of vanes 160 are arranged in a direction opposite to the first direction H with respect to the axial direction X of the impeller 110, Can be inclined along two directions (I).

The number of the plurality of vanes 160 of the return channel 130b may be related to the number of the plurality of vanes 113 of the impeller 110. [ Specifically, when the number of the plurality of vanes 160 and the number of the plurality of the vanes 113 are divided into another one, the value may be an infinite prime number.

At least one of the plurality of vanes 160 and the plurality of vanes 113 may be an odd number. As an example, the number of the plurality of vanes 160 of the return channel 130b may be 13 to 23 and an odd number of 23 or less. However, the number of the plurality of blades 160 is not limited to the above example.

The return channel 130b may further include at least one sub wing 800. [

At least one sub-wing 800 serves to reduce noise that may occur during the passage of air through the suction unit 100b.

At least one sub blade (800) may be formed on the discharge passage (161).

At least one sub-wing 800 may be provided between the plurality of blades 160 so as to have the same inclination as the plurality of blades 160 forming the discharge flow path 161.

At least one sub-wing 800 may be formed in at least one of the inlet 137 and the outlet 135 of the discharge flow passage 161.

At least one sub-wing 800 may have a lower height than the plurality of blades 160 in the axial direction X of the impeller 110. Preferably, at least one sub-wing 800 may have a height of less than 50% of the plurality of blades 160 in the axial direction X of the impeller 110.

At least one sub-wing 800 may have different heights in the axial direction X of the impeller 110. Alternatively, at least one sub-wing 800 may have the same height in the axial direction X of the impeller 110.

At least one sub-wing 800 may include a first side 162a and a second side 163a.

The first surface 162a may face the outer surface of the inner frame 131 and the second surface 163a may face the inner surface of the outer frame 132. [

The first surface 162a of at least one sub blade unit 800 may be coupled to the outer surface of the inner frame 131 and the second surface 163a may be coupled to the inner surface of the outer frame 132. [

Alternatively, the first surface 162a of at least one sub-wing 800 may be coupled to the outer surface of the inner frame 131, and the second surface 163a may be spaced from the inner surface of the outer frame 132. [

Alternatively, the first surface 162a of at least one sub wing 800 may be spaced apart from the outer surface of the inner frame 131, and the second surface 163a may be coupled to the inner surface of the outer frame 132.

9 is a front view of a suction unit of a vacuum cleaner according to an embodiment of the present invention.

As shown in FIG. 9, the plurality of vanes 160 may have a height of 80% or more of the suction unit 100b in the axial direction X of the impeller 110. Specifically, the second surface 163 of the plurality of vanes 160 may have a height of 80% or more of the suction unit 100b in the axial direction X of the impeller 110. The height E of the suction unit 100b indicates the distance from the upper end of the impeller cover 120 to the lower end of the return channel 130b in a state where the impeller cover 120 and the return channel 130b are coupled to each other.

The plurality of vanes 160 corresponding to the inlet 137 of the discharge passage 161 are spaced apart from each other by a predetermined distance in the axial direction X of the impeller 110 at the upper end of the height E of the suction unit 100b . The starting point N of the second surface 163 forming the inlet 137 of the discharge flow path 161 is set to the axial direction X of the impeller 110 at the upper end of the height E of the suction unit 100b, As shown in FIG.

The plurality of vanes 160 corresponding to the outlet 135 of the discharge passage 161 can be located at the same position in the axial direction X of the impeller 110 and the lower end of the height E of the suction unit 100b . The second surface 163 forming the outlet 135 of the discharge passage 161 is positioned at the same position in the axial direction X of the impeller 110 with the lower end of the height E of the suction unit 100b can do.

10 is an enlarged cross-sectional view of a suction unit of a vacuum cleaner according to an embodiment of the present invention. Reference numerals not shown refer to Figs. 1 to 9.

10, the starting point N of the second surface 163 of the plurality of vanes 160 is extended further toward the impeller cover 120 than the starting point M of the first surface 162 . That is, the starting point N of the second surface 163 may be formed at a higher position in the axial direction X of the impeller 110 than the starting point M of the first surface 162.

The starting point N of the second surface 163 may be located at a position corresponding to 10% or more and 70% or less of the height of the flow path 115 formed in the impeller 110 in the axial direction X of the impeller 110 have. The height of the flow path 115 formed in the impeller 110 indicates the distance between the first plate 111 and the second plate 112.

FIG. 11 is a bottom view of a first unit of a return channel in a suction unit of a vacuum cleaner according to an embodiment of the present invention, FIG. 12 is a suction unit of a vacuum cleaner according to an embodiment of the present invention, Lt; RTI ID = 0.0 > a < / RTI > second channel of the return channel. 13A and 13B are sectional views showing a coupling structure of a first unit and a second unit of a return channel in a suction unit of a vacuum cleaner according to an embodiment of the present invention. Reference numerals not shown refer to Figs. 1 to 10.

As shown in FIGS. 11 to 13B, the return channel 130b may further include at least one anti-rotation unit 900 for coupling the plurality of units 139a and 139b.

At least one anti-rotation unit 900 may be formed inside the return channel 130b to be spaced apart from each other. At least one anti-rotation unit 900 may be spaced apart from each other by a certain distance.

At least one anti-rotation unit 900 may include a projection 910 and a fastening portion 920.

The projection 910 may be provided inside any one of the first unit 139a and the second unit 139b. More specifically, the projection 910 includes a first unit 139a and a second unit 139b, The inner frame 131 may be provided on the inner frame 131.

The fastening portion 920 may be provided inside the other one of the first unit 139a and the second unit 139b. Specifically, the fastening portion 920 may be provided on the inner frame 131 of the other one of the first unit 139a and the second unit 139b. The protrusion 910 may be detachably coupled to the coupling portion 920.

Preferably, the projection 910 may be provided inside the first unit 139a. The projections 910 may be provided on the inner frame 131 of the first unit 139a so as to protrude downward along the axial direction X of the impeller 110. [ The projection 910 may be formed integrally with the inner frame 131 of the first unit 139a.

The projection 910 may have a circular projection shape, but is not limited thereto.

A rib 911 protruding toward the inner side of the inner frame 131 may be formed on the projection 910. The rib 911 may be connected to the protrusion 910 such that the degree of protrusion toward the inner side of the inner frame 131 decreases toward the downward direction along the axial direction X of the impeller 110. The rib 911 may be integrally formed with the projection 910.

The fastening portion 920 may be provided inside the second unit 139b. The fastening portion 920 may be provided on the inner surface of the inner frame 131 of the second unit 139b.

The protrusion 910 formed in the first unit 139a may be coupled to the coupling part 920 provided in the second unit 139b. At this time, one end of the rib 911 downwardly directed along the axial direction X of the impeller 110 can be coupled and fixed to a coupling groove (not shown) provided on the inner surface of the coupling portion 920.

The inner frame 131 of the first unit 139a may include an extension portion 131a protruding downward along the axial direction X of the impeller 110. [ The extension 131a may have a circular projection shape having a diameter smaller than that of the inner frame 131. However, the shape of the extended portion 131a is not limited to the circular projection. The extension portion 131a may be coupled to the inside of the second unit 139b. The extension portion 131a can be coupled to the inner side of the inner frame 131 of the second unit 139b.

The projection 910 of the first unit 139a may be provided on the extension 131a.

The projection 910 of the first unit 139a may form a part of the extension 131a.

At least one fixing portion 930 protruding toward the outside of the first unit 139a may be provided on the outer surface of the extension portion 131a. That is, at least one of the fixing portions 930 may protrude outward toward the radial direction of the first unit 139a. At this time, at least one of the fixing portions 930 does not block the discharge flow path 161.

At least one fixing portion 930 may be coupled to the fixing groove 940 provided in the inner frame 131 of the second unit 139b. The fixing groove 940 may be provided on the inner surface of the inner frame 131 of the second unit 139b. At least one fixing portion 930 may be detachably coupled to the fixing groove 940. The number of the fixing grooves 940 and the number of the at least one fixing portions 930 may be equal to each other.

Thus, the first unit 139a and the second unit 139b of the return channel 130b can be detachably coupled by at least one anti-rotation unit 900. [ Further, the engagement of the first unit 139a and the second unit 139b can be further strengthened by the engagement of the at least one fixing portion 930 and the fixing groove 940. [

FIG. 14 is a view showing a structure including a nosecone in a suction unit of a vacuum cleaner according to an embodiment of the present invention. Reference numerals not shown refer to Figs. 1 to 13B.

As shown in FIG. 14, the suction unit 100b may further include a NOSE CONE 950. The nosecone 950 can be designed to be streamlined so that the aerodynamic resistance is small. The nosecone 950 may be provided on the second plate 112 of the impeller 110 to correspond to the position of the opening hole 114 formed in the first plate 111 of the impeller 110. The nosecone 950 can be coupled to one end of the motor shaft 141 fixed to the second plate 112. The nosecon 950 is installed on the second plate 112 of the impeller 110 to reduce the resistance of the air introduced into the impeller 110 through the opening hole 114 to improve the suction efficiency of the suction unit 100b .

15 is a view showing the appearance of a vacuum cleaner according to another embodiment of the present invention.

15, the vacuum cleaner 1 may include a suction unit 11 for sucking foreign substances by the suction force of air, and a main body 10 for collecting foreign substances sucked by the suction unit 11 .

A connection hose 12 and a connection pipe 13 are connected between the main body 10 and the suction unit 11 so that the suction force generated in the main body 10 can be transmitted to the suction unit 11, A handle 14 may be provided between the connection pipe 13 and the connection pipe 13 so that the user can grip the same.

The connecting hose 12 is formed of a flexible tube or the like and one end of the connecting hose 12 is connected to the main body 10 and the other end of the connecting hose 12 is connected to the handle 14, 11 can freely move around the main body 10 within a predetermined radius. The connection pipe 13 may be formed to have a predetermined length. One end of the connection pipe 13 is connected to the suction unit 11 and the other end of the connection pipe 13 is connected to the handle 14 so that the user can clean the foreign matter on the floor while standing.

FIG. 16 is a cross-sectional view illustrating a main body of a vacuum cleaner according to another embodiment of the present invention, and FIG. 17 is a perspective view illustrating a suction unit of a vacuum cleaner according to another embodiment of the present invention. FIG. 18 is an exploded perspective view of a suction unit of a vacuum cleaner according to another embodiment of the present invention, and FIG. 19 is an enlarged perspective view of a suction unit of a vacuum cleaner according to another embodiment of the present invention. FIG. 20 is a sectional view of a suction unit of a vacuum cleaner according to another embodiment of the present invention, and FIG. 21 is an enlarged sectional view of a suction unit of a vacuum cleaner according to another embodiment of the present invention.

16 to 21, a connecting hose 12 is connected to the front of the main body 10 and the air sucked by the suction unit 11 flows into the main body 10 along the connecting hose 12 Lt; / RTI > An exhaust unit 15 may be formed at a rear upper portion of the main body 10 so that the air filtered by the dust collecting apparatus 20 provided inside the main body 10 can be exhausted to the outside of the main body 10. [ The inside of the main body 10 is provided with a dust collecting chamber 10a in which a dust collecting apparatus 20 is installed, a suction chamber 10b in which a suction unit 100 and an exhaust passage 16 are provided, and a power cord (not shown) (Not shown).

A dust collecting device 20 for collecting dust sucked into the dust collecting chamber 10a through the connection hose 12 may be installed in the dust collecting chamber 10a. In the present embodiment, a cyclone device for separating foreign substances in the air sucked by the dust collecting device 20 by centrifugal force is used, but a dust container for collecting dust may also be used. In addition, the cover 21 can be hinged to the upper portion of the dust collecting chamber 10a so that the dust collecting apparatus 20 can be attached and detached.

The vacuum cleaner 1 may include a suction unit 100 for generating a suction force for sucking outside air into the main body 10. The suction unit 100 may be installed inside the suction chamber 10b.

The suction unit 100 may include an impeller 110, an impeller cover 120, and a return channel 130.

The impeller cover 120 may have an air inlet 121 formed therein. The suction port 121 is connected to the discharge port 22 of the dust collecting apparatus 20 by the connection pipe 17 to generate a suction force to the dust collecting apparatus 20.

The rotatable impeller 110 may be provided inside the impeller cover 120.

The impeller 110 may be a centrifugal fan that sucks air in the axial direction of the impeller 110 and discharges the air in a radial direction.

The impeller 110 may include a first plate 111, a second plate 112, and a plurality of rotating blades 113.

The first plate 111 and the second plate 112 may be arranged to face each other and a plurality of rotating blades 113 may be disposed between the first plate 111 and the second plate 112 have.

The upper surface of the plurality of rotary blades 113 is coupled to the first plate 111 located above the plurality of rotary blades 113 and the lower surface of the plurality of rotary blades 113 is coupled to a lower portion of the plurality of rotary blades 113 And the second plate 112 is positioned. Therefore, the first plate 111, the second plate 112, and the plurality of rotary vanes 113 can rotate integrally.

The first plate 111 may have an opening 114 corresponding to the inlet 121 of the impeller cover 120. The air that has passed through the inlet 121 can be introduced into the impeller 110 through the opening hole 114. [

One end of the motor shaft 141 is fixed to the second plate 112. Accordingly, the first plate 111, the second plate 112, and the plurality of rotary blades 113 can rotate integrally with the motor shaft 141 as a center.

A plurality of rotary blades 113 positioned between the first plate 111 and the second plate 112 may be formed to define a flow path 115 so as to be spaced apart from each other. The air that has passed through the opening hole 114 and flows into the impeller 110 moves along the flow path 115 and is transferred to the discharge path 161 formed in the return channel 130.

The impeller 110 may include a 3D impeller including a body and a blade having a shape that is gradually lowered in the radial direction.

The shape of the impeller 110 may be variously modified and is not limited to the above example.

The return channel 130 serves to convert the kinetic energy of the air sucked by the impeller 110 into pressure energy. The return channel 130 is connected to the impeller 110 through an impeller 110, (134) can be formed.

The return channel 130 may be disposed below the impeller 110.

The return channel 130 may be directly connected to the impeller 110 so that air passing through the impeller 110 can be directly introduced.

The return channel 130 may include an inner frame 131 and an outer frame 132.

The return channel 130 may be positioned below the impeller 110 and a seating portion 133 on which the impeller 110 is mounted may be formed on the upper surface of the inner frame 131.

The seating portion 133 may include a protrusion 133a protruding upward toward the impeller cover 120. [ The projecting portion 133a may be formed along the edge of the seating portion 133. The impeller 110 may be seated on the seat portion 133 so as to be positioned inside the projection 133a.

The protrusion 133a may have a curved surface.

The projecting portion 133a may have a convex curved surface toward the outside of the inner frame 131. [

The outer frame 132 may be located outside the inner frame 131 along the outer circumferential surface of the inner frame 131 and may be coupled with the impeller cover 120 to form an impeller accommodation space 134 for receiving the impeller 110 have.

The inner frame 131 and the outer frame 132 may be integrally formed.

A plurality of vanes 160 may be disposed in the return channel 130.

The plurality of blades 160 may be formed long between the inner frame 131 and the outer frame 132 along the axial direction X of the impeller 110. Accordingly, the plurality of vanes 160 can form the discharge passage 161 extending in the axial direction X of the impeller 110, and the suction performance of the suction unit 100 can be improved.

The plurality of blades 160 may be disposed on the return channel 130 to form an inclination with respect to the axial direction X of the impeller 110. Specifically, a plurality of vanes 160 can be disposed between the inner frame 131 and the outer frame 132. [

The plurality of blades 160 may be spaced apart from each other and disposed between the inner frame 131 and the outer frame 132. The plurality of vanes 160 spaced apart from each other can form a discharge passage 161 through which the air passing through the impeller 110 moves.

The discharge flow path 161 may include an inlet 137 and an outlet 135. The inlet 137 of the discharge passage 161 is connected to the upper end of the discharge passage 161 facing the impeller 110 so that the air having passed through the impeller 110 can be introduced into the discharge passage 161 through the inlet 137 . The outlet 135 of the discharge passage 161 is formed at the lower end of the discharge passage 161 so that air moving along the discharge passage 161 can be discharged to the outside of the suction unit 100 through the outlet 135 .

The degree of separation between the plurality of vanes 160 can be increased toward the outlet 135 of the discharge passage 161. That is, the width of the discharge flow path 161 can be wider as it gets closer to the outlet 135.

The plurality of blades 160 may include a first surface 162 and a second surface 163.

The first surface 162 may face the outer surface of the inner frame 131 and the second surface 163 may face the inner surface of the outer frame 132. The first surface 162 may include a starting point M located at the upper end of the first surface 162. The second surface 163 may include a starting point N located at an upper end of the second surface 163. The starting point N of the second surface 163 may form the inlet 137 of the discharge flow path 161 together with the starting point M of the first surface 162.

The first surface 162 of the plurality of vanes 160 may be coupled to the outer surface of the inner frame 131 and the second surface 163 of the plurality of vanes 160 may be coupled to the inner surface of the outer frame 132. [ .

The first surface 162 of the plurality of vanes 160 may also be coupled to the outer surface of the protrusion 133a. That is, the starting point M of the first surface 162 may also be coupled to the outer surface of the convex projection 133a toward the outside of the inner frame 131. [

The plurality of blades 160 may further include a connecting portion 164 connecting the starting point M of the first surface 162 and the starting point N of the second surface 163. The description of the various shapes of the connecting portion 164 will be described later.

The plurality of blades 160 may have a curved surface.

The direction in which the plurality of blades 160 are tilted is related to the rotating direction of the impeller 110. More specifically, when the impeller 110 rotates in the first direction H, the plurality of vanes 160 are arranged in a direction opposite to the first direction H with respect to the axial direction X of the impeller 110, Can be inclined along two directions (I).

The impeller cover 120 may include a guide portion 122. Specifically, the guide portion 122 serves to guide the air that has passed through the flow path 115 of the impeller 110 to the inlet 137 of the discharge path 161.

The guide part 122 stays in the space 191 formed between the impeller 110 and the return channel 130 until the air having passed through the flow path 115 is introduced into the inlet 137 of the discharge path 161 To have a curved surface. The guide portion 122 may have a convex curved surface toward the outside of the impeller cover 120. [

The guide portion 122 may have a curved surface having a curvature radius of 1 mm or more.

Air that has passed through the flow path 115 provided in the impeller 110 is introduced into the discharge flow path 161 provided in the return channel 130 along the guide part 122.

The moving direction of the air can be changed with respect to the guide portion 122. Specifically, the air that has passed through the opening hole 114 and flows into the impeller 110 moves in the horizontal direction along the flow path 115, and the air that has passed through the flow path 115 collides with the guide portion 122 And moves in the vertical direction toward the discharge flow path 161.

One end of the downwardly directed guide portion 122 can be coupled to the outer frame 132.

The suction unit 100 may further include a motor 140 that provides the impetus for the impeller 110 to rotate.

The motor 140 may include a BLDC motor, a DC motor, and an AC motor.

The motor 140 may be provided inside the return channel 130. Specifically, the motor 140 may be provided inside the inner frame 131.

The motor 140 may include a motor shaft 141. One end of the motor shaft 141 is connected to the second plate 112 of the impeller 110 and the other end of the motor shaft 141 is connected to the motor 140.

A motor shaft through hole 136 is formed in the seat 133 of the inner frame 131 so that one end of the motor shaft 141 is connected to the second plate 112 of the impeller 110 located above the inner frame 131. [ May be formed.

The air discharged to the outlet 135 formed at one end of the discharge flow path 161 is formed in the lower part of the suction unit 100 through the internal flow path 41 formed inside the case 40 surrounding the suction unit 100 And is discharged through a discharge port 42 which is a discharge port. The air discharged through the discharge port (42) is exhausted to the exhaust section (15) via the exhaust passage (16). Here, the exhaust flow path 16 refers to a flow path through which the air discharged from the discharge port 42 of the suction unit 100 reaches the exhaust part 15.

The space formed between the dust collecting device 20 and the suction unit 100 may form a part of the exhaust flow path 16.

The exhaust passage 16 can be bent at least once. The exhaust flow path 16 extends from the discharge port 42 of the suction unit 100 to a space between the dust collecting apparatus 20 and the suction unit 100. The first flow path 16a extends from the first flow path 16a, A second flow path 16b formed between the apparatus 20 and the suction unit 100 and a third flow path 16c connecting the second flow path 16b and the discharge part 15. [

An exhaust filter 18 for separating foreign matter not removed by the dust collecting device 20 may be provided on the exhaust flow path 16. The exhaust filter 18 is preferably disposed on the first flow path 16a or the second flow path 16b. This is because when the exhaust filter 18 is installed on the first flow path 16a or the second flow path 16b, a sufficient distance can be secured from the exhaust filter 18 to the exhaust part 15, Since the noise generated when passing through the exhaust pipe 15 can be sufficiently reduced and exhausted through the exhaust unit 15. It is also possible to secure a sufficient area of the exhaust filter 18 by providing the exhaust filter 18 in the first flow path 16a or the second flow path 16b having a relatively large sectional area, 18) in the case where the pressure loss is small.

An opening (not shown) that can be opened and closed by a door (not shown) may be formed on the bottom surface of the main body 10 to facilitate replacement of the exhaust filter 18. [

22 is an enlarged cross-sectional view showing another portion of a suction unit of a vacuum cleaner according to another embodiment of the present invention.

As shown in Fig. 22, connecting the starting point M of the first surface 162 coupled to the inner frame 131 and the starting point N of the second surface 163 coupled to the outer frame 132 The straight line A may form an inclination of 5 to 85 에 with respect to the axial direction X of the impeller 110.

As described above, the guide portion 122 may be convex toward the outside of the impeller cover 120, and may have a curved surface having a radius of curvature of 1 mm or more. The guide portion 122 may have a curved surface having a quadratic curve shape.

23 is a view showing a part of a plurality of vanes disposed between an inner frame and an outer frame in a vacuum cleaner according to another embodiment of the present invention, And schematically showing various shapes on the side.

23 to 24P, the connecting portion 164 of the plurality of blades 160 may have various shapes.

The connection portion 164 may include at least one of a curved surface and a flat surface.

The connecting portion 164 may include curved surfaces having different curvatures.

The connecting portion 164 may include a curved surface having an inflection point.

The connecting portion 164 may include a plane having a constant inclination.

The connecting portion 164 may include a plurality of planes having different slopes. That is, the plane forming the connecting portion 164 can be bent.

The connecting portion 164 may include a curved surface and a flat surface at the same time.

The starting point N of the second surface 163 may extend further upward toward the impeller cover 120 than the starting point M of the first surface 162. That is, the starting point N of the second surface 163 may be formed at a higher position in the axial direction X of the impeller 110 than the starting point M of the first surface 162.

Or the starting point N of the second surface 163 may extend upwardly toward the impeller cover 120 by the same amount as the starting point M of the first surface 162. That is, the starting point N of the second surface 163 and the starting point M of the first surface 162 may have the same height in the axial direction X of the impeller 110.

The connecting portion 164 includes a peak S extending further upward toward the impeller cover 120 than at least one of the starting point M of the first surface 162 and the starting point N of the second surface 163 can do. Preferably, the peak S may further extend upwardly toward the impeller cover 120 than the starting point M of the first surface 162.

FIG. 25 is a side view of a suction unit of a vacuum cleaner according to another embodiment of the present invention, and FIG. 26 is a perspective view of a vacuum cleaner according to another embodiment of the present invention in which a portion of a plurality of blades, which are inclined in the same direction as the rotating direction of the impeller, Fig. FIG. 27 is an enlarged cross-sectional view of a portion of a plurality of blades which are inclined in a direction opposite to a rotating direction of an impeller in a vacuum cleaner according to another embodiment of the present invention. FIG.

25 to 27, on the end face Q on which the return channel 130 is cut in the horizontal direction Y perpendicular to the axial direction X of the impeller 110, A straight line B connecting the upper end 162b of the face 162 and the upper end 163b of the second face 163 is formed between the center O of the return channel 130 and the upper face 162a of the first face 162 The angle? Formed with the straight line C connecting the end portion 162b may be equal to or larger than 0 mm and equal to or smaller than 80 mm. More specifically, when the impeller 110 rotates in the first direction H, a straight line connecting the upper end 162b of the first surface 162 and the upper end 163b of the second surface 163 B is inclined from the center O of the return channel 130 and the upper end 162b of the first face 162 to the first direction H toward the straight line C by 0 to 80 어 Can be. When the impeller 110 rotates in the first direction H, the straight line B (B) connecting the upper end 162b of the first face 162 and the upper end 163b of the second face 163 Is inclined by 0 to 80 ㅀ toward the second direction I with respect to a straight line C connecting the center O of the return channel 130 and the upper end 162b of the first surface 162 .

The upper end 162b of the first face 162 facing upward and the upper end 162b of the second face 162 facing upward are formed on the end face Q of the return channel 130 cut in the horizontal direction Y perpendicular to the axial direction X of the impeller 110 The upper end 163b of the second surface 163 may be connected in a straight line or a curved line.

28 is a perspective view illustrating a first embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention. Hereinafter, Figs. 28 to 33 show a high appearance by turning the suction unit 100 upside down. The upper portion of the return channel 130 indicates the inlet 137 side of the discharge flow passage 161 and the lower portion of the return channel 130 indicates the outlet 135 side of the discharge flow passage 161. [

As shown in FIG. 28, the suction unit 100 may further include a printed circuit board 210 and a support unit 200.

The printed circuit board 210 may be positioned below the return channel 130 in the axial direction X of the impeller 110. That is, the printed circuit board 210 may be positioned below the return channel 130 so as to be adjacent to the outlet 135 of the discharge flow path 161. The printed circuit board 210 may be located at the inner lower portion of the return channel 130 so as not to block the discharge flow path 161.

The support unit 200 may be positioned below the printed circuit board 210 in the axial direction X of the impeller 110. The support unit 200 supports the motor 140 and the printed circuit board 210 provided in the return channel 130 at a lower portion of the return channel 130.

The support unit 200 may be coupled to at least one protrusion 220 (see FIG. 18) formed in the return channel 130.

At least one protrusion 220 may be formed inside the return channel 130 to be located outside the motor 140. In addition, at least one protrusion 220 may be formed integrally with the return channel 130.

The support unit 200 may include a metal material.

The support unit 200 may include a body 201 and a cooling fin 202.

The body 201 may be disposed on the inner lower side of the return channel 130 to support the motor 140 and the printed circuit board 210 provided in the return channel 130. [ The body 201 may be disposed at an inner lower portion of the return channel 130 so as not to block the discharge flow path 161.

The cooling fin 202 may be formed at the end of the support unit 200 so as to be adjacent to the outlet 135 of the discharge passage 161. [ The cooling fin 202 may be formed at the edge of the body 201. The cooling fin 202 may protrude radially toward the outside of the body 201.

The cooling fin 202 may be disposed below the outlet 135 of the discharge flow passage 161 so as not to interfere with the flow of the air discharged to the outlet 135 of the discharge flow passage 161.

Heat generated in the printed circuit board 210 and the motor 140 may be transmitted to the cooling fin 202 via the body 201. The air discharged to the outlet 135 of the discharge passage 161 can cool the heat transferred to the cooling fin 202 in the process of passing through the cooling fin 202. [

The cooling fins 202 serve to extend the discharge flow path 161 in the axial direction X of the impeller 110 and contribute to the suction force of the suction unit 100. [

The cooling fin 202 may be integrally formed with the body 201.

The cooling fin 202 may be disposed on all or a part of the outlet 135 of the discharge flow passage 161 depending on the amount of heat generated by the printed circuit board 210 and the motor 140. [

FIG. 29 is a perspective view showing a second embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention, and FIG. 30 is a sectional view showing a second embodiment of the cooling structure of FIG. Hereinafter, a description overlapping with Fig. 28 will be omitted.

29 and 30, the support unit 200 may be disposed below the printed circuit board 210 so as not to close the outlet 135 of the discharge passage 161. [

The body 201 of the support unit 200 may have a circular shape and the cooling fin 202 may be formed along the circumference of the body 201. [ The cooling fin 202 may be disposed on the entire outlet 135 of the discharge flow passage 161. That is, the cooling fin 202 may be disposed below the outlet 135 of the discharge flow passage 161.

As the number of cooling fins 202 increases, the cooling efficiency may increase.

31 is a sectional view showing a third embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention. The contents overlapping with those in Fig. 28 to Fig. 30 will be omitted.

The support unit 200 may be formed inside the return channel 130 to support the motor 140 and the printed circuit board 210, as shown in Fig. That is, the cooling fin 202 protruding from the body 201 of the support unit 200 toward the outer side of the body 201 may face the inner surface of the outer frame 132. The cooling fin 202 may abut or engage with the inner surface of the outer frame 132.

The support unit 200 may be positioned below the printed circuit board 210 to support the motor 140 and the printed circuit board 210. At this time, the outer frame 132 of the return channel 130 may be further extended toward the lower side of the return channel 130 so that the cooling fin 202 contacts the inner surface of the outer frame 132. That is, one end of the outer frame 132, which faces downward of the return channel 130, may be disposed on the same line as the support unit 200.

32 is a cross-sectional view illustrating a fourth embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention. 28 to 31 will be omitted.

As shown in FIG. 32, the support unit 200 can be received inside the return channel 130. The support unit 200 may be located on the inner lower side of the return channel 130 to support the motor 140. The printed circuit board 210 may be provided under the support unit 200.

The cooling fin 202 protruding from the body 201 of the support unit 200 toward the outer side of the body 201 may face the inner surface of the outer frame 132. The cooling fin 202 may abut or engage with the inner surface of the outer frame 132.

The outer frame 132 of the return channel 130 may be further extended toward the lower side of the return channel 130. Specifically, one end of the outer frame 132 facing downward of the return channel 130 may be disposed on the same line as the printed circuit board 210.

33 is a sectional view showing a fifth embodiment of a cooling structure of a vacuum cleaner according to another embodiment of the present invention. The contents overlapping with those in Fig. 28 to Fig. 32 will be omitted.

As shown in FIG. 33, a plurality of support units 200 may be disposed under the return channel 130. Specifically, the plurality of support units 200 may be disposed on the upper and lower portions of the printed circuit board 210 in the axial direction X of the impeller 110, respectively. The cooling fin 202 of the support unit 200 facing the motor 140 may extend from the body 201 so as to face the inner surface of the outer frame 132. [ The cooling fin 202 of the support unit 200 provided under the printed circuit board 210 may protrude toward the outside of the body 201. The cooling fin 202 of the support unit 200 provided under the printed circuit board 210 may be exposed to the outside of the return channel 130.

Fig. 34 is a sectional view showing a first embodiment of the arrangement structure of a plurality of vanes in a vacuum cleaner according to another embodiment of the present invention, and Fig. 35 is a partial view of Fig. 34 cut in the horizontal direction Y. Fig. 35 to 37 show a part of a section Q cut by the return channel 130 in the horizontal direction Y perpendicular to the axial direction X of the impeller 110. [

34 and 35, a plurality of blades 160 may be disposed between the inner frame 131 and the outer frame 132 of the return channel 130. [ The plurality of blades 160 may be disposed between the inner frame 131 and the outer frame 132 to form an inclination with respect to the axial direction X of the impeller 110. [

The plurality of blades 160 may be disposed between the inner frame 131 and the outer frame 132 so as to be spaced apart from the outer frame 132. Specifically, the first surface 162 of the plurality of vanes 160 may be coupled to the outer surface of the inner frame 131, and the second surface 163 may be spaced from the inner surface of the outer frame 132.

The second surface 163 of the plurality of vanes 160 may be entirely spaced from the inner surface of the outer frame 132 from the inlet 137 to the outlet 135 of the discharge passage 161.

Alternatively, the second surface 163 of the plurality of blades 160 may be spaced apart from the inner surface of some outer frame 132 from the inlet 137 to the outlet 135 of the discharge flow passage 161. The second surface 163 of the plurality of vanes 160 may be spaced apart from the inner surface of the outer frame 132 as it approaches the outlet 135 of the discharge path 161. [ The second surface 163 adjacent to the inlet 137 of the discharge passage 161 is coupled to the inner surface of the outer frame 132 and the second surface 163 adjacent to the outlet 135 of the discharge passage 161, May be spaced apart from the inner surface of the outer frame 132.

The degree of separation between the inner surface of the outer frame 132 and the second surface 163 may vary along the axial direction X of the impeller 110.

The plurality of blades 160 may be integrally formed with the inner frame 131.

As the second surface 163 is separated from the inner surface of the outer frame 132, the peeling phenomenon of the air generated in the discharge path 161 can be reduced, and the suction force of the suction unit 100 can be improved.

36 is a cross-sectional view showing a second embodiment of the arrangement structure of a plurality of vanes in a vacuum cleaner according to another embodiment of the present invention.

36, the plurality of blades 160 may be disposed between the inner frame 131 and the outer frame 132 so as to form an inclination with respect to the axial direction X of the impeller 110. As shown in FIG.

The plurality of blades 160 may be disposed between the inner frame 131 and the outer frame 132 so as to be spaced apart from the inner frame 131. Specifically, the second surface 163 of the plurality of vanes 160 is coupled to the inner surface of the outer frame 132, and the first surface 162 can be spaced from the outer surface of the inner frame 131. [

The first surface 162 of the plurality of blades 160 may be spaced apart from the outer surface of the inner frame 131 all the way from the inlet 137 to the outlet 135 of the discharge flow passage 161.

Alternatively, the first surface 162 of the plurality of vanes 160 may be spaced apart from the outer surface of some of the inner frames 131 from the inlet 137 to the outlet 135 of the discharge passage 161.

The outer surface of the inner frame 131 and the degree of separation of the first surface 162 may be different along the axial direction X of the impeller 110.

The plurality of blades 160 may be integrally formed with the outer frame 132.

37 is a cross-sectional view showing a third embodiment of the arrangement structure of a plurality of vanes in a vacuum cleaner according to another embodiment of the present invention.

37, the plurality of vanes 160 may include a first vane 165 and a second vane 166 disposed between the inner frame 131 and the outer frame 132. As shown in FIG. The first wing 165 is coupled to the outer surface of the inner frame 131 and the second wing 166 is coupled to the inner surface of the outer frame 132.

One end of the first wing 165 facing the inner surface of the outer frame 132 may be spaced apart from one end of the second wing 166 facing the outer surface of the inner frame 131. [

The first wing 165 and the second wing 166 may be alternately positioned with respect to each other.

A portion of the second wing 166 facing the outer surface of the inner frame 131 on the end face Q cut from the return channel 130 in the horizontal direction Y perpendicular to the axial direction X of the impeller 110 One end is not located on the straight line J connecting the one end of the first wing 165 toward the inner surface of the outer frame 132 and the center O of the return channel 130.

38 is a sectional view of a suction unit of a vacuum cleaner according to another embodiment of the present invention. The description overlapping with Figs. 15 to 36 is omitted.

38, the return channel 130 may be positioned below the impeller 110, and a seating portion 133 on which the impeller 110 is seated may be formed on the upper surface of the inner frame 131 have.

The seating portion 133 may have a flat surface. That is, the protrusion 133a (refer to FIG. 20) formed along the edge of the seating portion 133 may be omitted.

FIG. 39 is a cross-sectional view illustrating a main body of a vacuum cleaner according to another embodiment of the present invention, and FIG. 40 is a perspective view illustrating a suction unit of a vacuum cleaner according to another embodiment of the present invention. FIG. 41 is an exploded perspective view of a suction unit of a vacuum cleaner according to another embodiment of the present invention, and FIG. 42 is an enlarged perspective view of a suction unit of a vacuum cleaner according to another embodiment of the present invention. 43 is a sectional view of a suction unit of a vacuum cleaner according to another embodiment of the present invention. Hereinafter, a description overlapping with those already described in Figs. 15 to 38 will be omitted.

39 to 43, the suction unit 100a of the vacuum cleaner 1a may include an impeller 110a, a return channel 130a, and a cover 170. As shown in Fig.

The upper surface of the cover 170 may have an air inlet 121a. A rotatable impeller 110a and a return channel 130a may be disposed inside the cover 170. [

The return channel 130a may be disposed below the impeller 110a.

The return channel 130a may be directly connected to the impeller 110a so that air passing through the impeller 110a may be directly introduced.

The suction unit 100a may further include a motor 140a and a motor housing 150. [

The motor 140a provides a driving force for rotating the impeller 110a and is provided inside the motor housing 150. [ The motor housing 150 is located below the return channel 130a and can be coupled with the cover 170 to form a receiving space 180 in which the impeller 110a and the return channel 130a can be received.

At least one outlet 135a may be formed in the motor housing 150. The outlet 135a may be formed at the lower end of the motor housing 150, but the position of the outlet 135a is not limited thereto.

A plurality of vanes 160a may be disposed between the return channel 130a and the cover 170 along the outer circumferential surface of the return channel 130a. The plurality of blades 160a can form an inclination with respect to the axial direction X of the impeller 110a. More specifically, when the impeller 110a rotates in the second direction I, the plurality of vanes 160a are inclined relative to the axial direction X of the impeller 110a in the direction opposite to the second direction I, Can be inclined along one direction (H).

The plurality of blades 160a may be elongated in the axial direction X of the impeller 110a so as to form an inclination along the second direction I.

The plurality of vanes 160a may be fixed to the extension portion 151 extending toward the outside of the motor housing 150 to face the return channel 130a. Specifically, the lower ends of the plurality of vanes 160a can be fixed to the extending portion 151 so as to be positioned between the return channel 130a and the extending portion 151. [

The plurality of blades 160a can form a convex curved surface toward the first direction H which is the same as the rotational direction of the impeller 110a.

The plurality of blades 160a may include a first surface 190 and a second surface 200. [ The first surface 190 may be coupled to the outer surface of the return channel 130a and the second surface 200 may be coupled to the inner surface of the cover 170. The upper end 200a of the second surface 200 may extend further upward than the upper end 190a of the first surface 190. [

The air that has flowed into the intake port 121a and has passed through the flow path 115a provided in the impeller 110a is moved into the motor housing 150 along the discharge flow path 161a formed by the plurality of vanes 160a, Thereby cooling the motor 140a inside the housing 150. [ Thereafter, the air is radially discharged through at least one outlet 135a provided in the motor housing 150.

The cover 170 may include a guide portion 122a for guiding the air that has passed through the flow path 115a of the impeller 110a to the discharge path 161a.

44 is an enlarged cross-sectional view of a suction unit of a vacuum cleaner according to another embodiment of the present invention.

44, a straight line A connecting the starting point M of the first surface 190 of the plurality of vanes 160a to the starting point N of the second surface 200 is formed by the impeller 110a, A slope of not less than 5 mm and not more than 85 mm can be formed with respect to the axial direction (X).

45 is an enlarged cross-sectional view of a plurality of wings of a vacuum cleaner according to another embodiment of the present invention.

45, on the end face Q cut off the return channel 130a in the horizontal direction Y perpendicular to the axial direction X of the impeller 110a, the upwardly facing first face 190 A straight line B connecting the upper end 190b of the second face 200 and the upper end 200b of the second face 200 is formed between the center O of the return channel 130a and the upper end 190b of the first face 190 ) May be between 0 ㅀ and 80 ㅀ.

46 shows the inclination of the impeller of the straight line A connecting the starting point M of the first surface and the starting point N of the second surface with respect to the axial direction X and the suction force of the vacuum cleaner according to the embodiment of the present invention . ≪ / RTI >

46, a straight line A connecting the starting point M of the first surface 162,190 of the plurality of blades 160,160a to the starting point N of the second surface 163,200 is connected to the impeller 110,110a, It is possible to confirm that the suction force of the suction units 100 and 100a increases as the inclination of 5 to 85 를 is formed with respect to the axial direction X of the suction units 100 and 100a.

Fig. 47 is a cross-sectional view showing a cross section Q on which a return channel is cut in a horizontal direction Y perpendicular to the axial direction X of the impeller, and a straight line B connecting one end of the first surface and one end of the second surface And the straight line C connecting the center of the return channel and one end of the first surface and the suction force of the vacuum cleaner according to an embodiment of the present invention.

As shown in the graph of Fig. 47, on the section Q cut off the return channels 130 and 130a in the horizontal direction Y perpendicular to the axial direction X of the impellers 110 and 110a, A straight line B connecting the upper ends 162b and 190b of the surfaces 162 and 190 and the upper ends 163b and 200b of the second surfaces 163 and 200 connects the center O of the return channels 130 and 130a, The angle? Formed with the straight line C connecting the upper ends 162b and 190b of the upper and lower ends 162 and 190 may be 0 or more and 80 or less.

The straight line B connecting the upper ends 162b and 190b of the upwardly facing first surfaces 162 and 190 and the upper ends 163b and 200b of the second surfaces 163 and 200 connects the center of the return channels 130 and 130a And the straight line C connecting the upper ends 162b and 190b of the first surface 162 and the upper surface 162 of the first surface 162 are closer to 0 ㅀ, the suction force and efficiency are superior.

&Quot; - "and" + "in the expression of the angle [theta] represent the relationship with the rotational direction of the impeller 110. [ That is, a straight line B connecting the upper ends 162b and 190b of the first surfaces 162 and 190 and the upper ends 163b and 200b of the second surfaces 163 and 200 connects the center O of the return channels 130 and 130a, + "When inclined toward the same direction as the rotational direction of the impellers 110 and 110a with respect to the straight line C connecting the upper ends 162b and 190b of the first and second surfaces 162 and 190. On the other hand, a straight line B connecting the upper ends 162b and 190b of the first surfaces 162 and 190 and the upper ends 163b and 200b of the second surfaces 163 and 200 connects the center O of the return channels 130 and 130a, Quot; - "when inclined toward the direction opposite to the rotation direction of the impellers 110 and 110a with respect to the straight line C connecting the upper ends 162b and 190b of the first and second surfaces 162 and 190.

The suction units 100, 100a, and 100b described above can be applied regardless of the types of the cleaners 1, 1 a, and 1000. That is, the suction unit 100 is applicable to a robot cleaner, a Canister type cleaner, and an up-right type cleaner.

The foregoing has shown and described specific embodiments. However, it should be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the technical idea of the present invention described in the following claims .

1.1a: Cleaner 10: Body
10a: House Truth 10b: Suction chamber
11: Suction part 12: Connection hose
13: Connector 14: Handle
15: exhaust part 16: exhaust air flow
16a: first flow path 16b: second flow path
16c: third flow path 17: connection piping
18: exhaust filter 20: dust collecting device
21: dust collecting device cover 22: discharge port of the dust collecting device
40: Case 41: Inner channel
42: outlet 100, 100a, 100b: suction unit
110, 110a: impeller 111: first plate
112: second plate 113: rotating blade
114: aperture hole 115, 115a:
120: Impeller cover 121, 121a:
122, 122a: guide part 130, 130a, 130b: return channel
131: Inner frame 132: Outer frame
133: seat part 134: impeller accommodation space
135, 135a: Outlet 136: Motor shaft through hole
140, 140a: motor 141: motor shaft
150: motor housing 151: extension
160, 160a: wings 161, 161a:
162, 190, 162a: first surface 162b, 190b:
163, 200, 163a: second surface 163b, 200b: upper end
164: connection 170: cover
180: accommodation space 191: space
1000: robot cleaner 133a:
137: inlet 200: support unit
201: body 202: cooling pin
210: printed circuit board 220: projection
165: first wing 166: second wing
300: housing 400: first housing
410: Obstacle detection sensor 500: Second housing
510: dust collecting box 530: dust collecting unit
540: driving wheel 541: first driving wheel
542: second driving wheel 550: power source unit
551: main board 600: connecting member
700: bumper 710: buffer member
720: Entry blocking sensor 511:
139a: first unit 139b: second unit
131a: extension part 800:
900: rotation preventing unit 911: rib
920: fastening part 930:
940: Fixing groove 950:
960: Fixing member

Claims (28)

A vacuum cleaner comprising a suction unit for generating a suction force for sucking air into the main body,
The suction unit includes:
A rotatable impeller;
An impeller cover having an inlet port formed therein; And
And a return channel coupled to the impeller cover to receive the impeller therein,
The return channel includes:
Inner frame (INNER FRAME); And
And an outer frame (OUTER FRAME) positioned outside the inner frame to be spaced apart from the inner frame,
Wherein a plurality of blades are disposed between the inner frame and the outer frame. The method according to claim 1,
Wherein the return channel is directly connected to the impeller so that air passing through the impeller can be introduced. The method according to claim 1,
Wherein the plurality of blades form a slope with respect to an axial direction (X) of the impeller. The method of claim 3,
The impeller rotates in a first direction (H)
Wherein the plurality of blades form a slope along a second direction (I) opposite to the first direction (H) with respect to an axial direction (X) of the impeller. The method according to claim 1,
Wherein the plurality of blades include a curved surface. The method according to claim 1,
Wherein the plurality of vanes are spaced apart from each other to form an exhaust passage through which the air having passed through the impeller moves,
The discharge passage
An inlet formed at one end facing the impeller; And
And an outlet formed at the other end to be spaced apart from the inlet,
And the air introduced into the discharge passage through the inlet is discharged to the outside of the suction unit through the outlet. The method according to claim 6,
Wherein the impeller cover includes a guide portion coupled to the outer frame to guide air passing through the impeller to the inlet,
Wherein the guide portion has a curved surface. 8. The method of claim 7,
Wherein the guide portion is convex toward the outside of the impeller cover and has a curved surface having a radius of curvature of 1 mm or more. The method according to claim 6,
Wherein the plurality of blades
A first surface facing the outer surface of the inner frame and including a starting point (M); And
And a second surface facing the inner surface of the outer frame and including a starting point (N) forming the inlet with the starting point (M). 10. The method of claim 9,
The straight line A connecting the starting point M of the first surface and the starting point N of the second surface forms a slope of not less than 5 ㅀ and not more than 85 에 with respect to the axial direction X of the impeller Cleaner. 10. The method of claim 9,
On a section (Q) of the return channel cut in a horizontal direction (Y) perpendicular to the axial direction (X) of the impeller,
And a straight line (B) connecting one end of the first surface facing the impeller cover and one end of the second surface is a straight line connecting the center of the return channel and one end of the first surface facing the impeller cover And the angle (?) With the center axis (C) is equal to or larger than 0 mm and equal to or smaller than 80 mm. 10. The method of claim 9,
Wherein the starting point (N) of the second surface further extends toward the impeller cover than a starting point (M) of the first surface. 10. The method of claim 9,
Wherein the plurality of blades further include a connecting portion connecting a starting point (M) of the first surface and a starting point (N) of the second surface,
Wherein the connection portion includes at least one of a curved surface and a flat surface. 14. The method of claim 13,
Wherein the connection portion includes a maximum point extending further toward the impeller cover than at least one of a starting point (M) of the first surface and a starting point (N) of the second surface. The method according to claim 1,
Wherein the suction unit further comprises a motor provided inside the return channel, having a motor shaft coupled with the impeller to provide a driving force for rotating the impeller. A vacuum cleaner comprising a suction unit for generating a suction force for sucking air into the main body,
The suction unit includes:
A rotatable impeller;
An impeller cover having an inlet port formed therein; And
And a return channel coupled to the impeller cover to receive the impeller therein and directly connected to the impeller so that air passing through the impeller can be introduced,
Wherein the return channel is formed by combining a plurality of units detachable from each other. 17. The method of claim 16,
Wherein the plurality of units are separable so as to form an inclination with respect to an axial direction (X) of the impeller. 17. The method of claim 16,
Wherein the plurality of units are separable in a horizontal direction (Y) perpendicular to an axial direction (X) of the impeller. 17. The method of claim 16,
The return channel includes:
Inner frame (INNER FRAME);
An outer frame (OUTER FRAME) positioned outside the inner frame to be spaced apart from the inner frame; And
And a plurality of vanes disposed between the inner frame and the outer frame,
Wherein the plurality of units are separable in a horizontal direction (Y) perpendicular to an axial direction (X) of the impeller. 20. The method of claim 19,
Wherein the plurality of blades form a slope with respect to an axial direction (X) of the impeller, and include curved surfaces. 20. The method of claim 19,
Wherein the return channel further comprises at least one anti-rotation unit coupling the plurality of units. 22. The method of claim 21,
Wherein the at least one anti-rotation unit is formed inside the return channel to be spaced apart from each other. 22. The method of claim 21,
Wherein the plurality of units include:
A first unit positioned on an upstream side of a direction (G) in which air passing through the impeller moves; And
And a second unit located on a downstream side of a direction (G) in which air passing through the impeller moves,
Wherein the at least one rotation preventing unit includes a projection provided inside one of the first unit and the second unit. 24. The method of claim 23,
Wherein the at least one rotation preventing unit is provided inside the other of the first unit and the second unit and further comprises a fastening part detachably coupled to the projection. A vacuum cleaner comprising a suction unit for generating a suction force for sucking air into the main body,
The suction unit includes:
A rotatable impeller;
An impeller cover having an inlet port formed therein; And
And a return channel coupled to the impeller cover to receive the impeller therein and directly connected to the impeller so that air passing through the impeller can be introduced,
Wherein a plurality of blades forming an inclination with respect to an axial direction (X) of the impeller are disposed in the return channel. 26. The method of claim 25,
Wherein the plurality of blades include a curved surface. 26. The method of claim 25,
The impeller rotates in a first direction (H)
Wherein the plurality of blades form a slope along a second direction (I) opposite to the first direction (H) with respect to an axial direction (X) of the impeller. 26. The method of claim 25,
The return channel includes:
Inner frame (INNER FRAME); And
And an outer frame (OUTER FRAME) positioned outside the inner frame to be spaced apart from the inner frame,
Wherein the plurality of blades are disposed between the inner frame and the outer frame.

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