CN100516546C - Electric blower and electric vacuum cleaner using the electric blower - Google Patents

Abstract

There is provided an electric blower capable of satisfactorily enhancing the blowing efficiency of an impeller and an electric cleaner having the electric blower. In the electric blower of the present invention, an area of a passage cross-section perpendicular to a center line of a passage, defined by front shroud 2, rear shroud 3 and hub 6 of inducer 8 from inlet 5 to outlet 25 of impeller 1, is monotonically increased from inlet 5 to outlet 25. Accordingly, air flow speed depending on the flow rate in impeller 1 is gradually decreased throughout the whole passage from inlet 5 to outlet 25, so that acceleration or rapid deceleration of the air flow speed is prevented, thereby satisfactorily enhancing the blowing efficiency.

Description

Electric blower and electric vacuum cleaner using the electric blower

technical field

The present invention relates to an electric blower capable of improving the blowing efficiency of an impeller, and an electric vacuum cleaner using the electric blower.

Background technique

Up to now, electric blowers aiming at improving the blowing efficiency of the impeller have been proposed (for one example, refer to Japanese Patent Laid-Open Publication No. 2006-9669).

As shown in FIG. 10 , the impeller 40 in the above-mentioned electric fan is composed of a front shield surface 41 , a rear shield surface 42 and a plurality of blades 43 arranged between the two shields. The shape of the front shield surface 41 is set to be inclined, so that the distance from the front shield surface 41 to the rear shield surface (substrate) 42 becomes shorter as the distance from the center (that is, when moving toward the outer periphery) becomes shorter. (that is, a>b>c>d), and at the same time, the radial cross-sectional shape of the front shielding surface 41 is curved. In this way, as shown in FIG. 11( a), the variation of the cylindrical cross-sectional area of the flow path will be a linear increase in the radial direction from the inner diameter to the outer diameter of the impeller 40 (that is, from the flow path inlet to the flow path outlet). ; and as shown in FIG. 11( b ), the variation of the flow velocity in the radial direction from the flow path inlet to the flow path exit will be a linear decrease.

However, there is the following problem in the structure of the above-mentioned existing device, that is, since the front shielding surface is arranged in an opening shape at the entrance of the curved impeller 40 where the airflow sucked in turns from the rotation axis direction to the radial direction, only the front shielding surface If the distance between the surface 41 and the rear shielding surface 42 changes and the shape of the curved surface of the front shielding surface 41 cannot obtain a straight line relationship from the outer diameter of the impeller to the inlet, it is impossible to realize the flow path cut-off that can be expected to fully improve the blowing efficiency of the impeller. area.

Contents of the invention

The present invention aims to solve the above-mentioned problems in the prior art, and its purpose is to provide an electric fan that can sufficiently improve the blowing efficiency of the impeller from the inlet to the outlet, and an electric vacuum cleaner using the fan.

In order to solve the above-mentioned problems in the prior art, the electric fan impeller of the present invention is provided with a wind guide wheel with a hub, and the front shielding surface, the rear shielding surface and the wind guide wheel hub form an air flow path, and from the inlet In the cross section of the flow path perpendicular to the flow path between the outlet and the outlet, the cross-sectional area of the flow path increases monotonically from the inlet to the outlet.

In this way, the flow velocity generated by the flow inside the impeller gradually decelerates in the entire flow path area from the inlet to the outlet, without repeated acceleration and sudden deceleration, and the blowing efficiency can be sufficiently improved.

In addition, the electric vacuum cleaner using the above-mentioned electric blower can improve dust collection performance, and can realize comfortable dust collection.

The technical effect produced by the present invention is that the electric blower of the present invention and the electric vacuum cleaner adopting the electric blower are expected to fully improve the blowing efficiency.

Specific embodiments of the present invention are summarized as follows. The electric fan in the first solution of the present invention includes: an impeller provided with a front shielding surface, a rear shielding surface and a plurality of blades between the two shielding surfaces; a hub arranged inside the inlet of the impeller The wind deflector wheel; the air guiding part located at the periphery of the impeller; the casing surrounding the air guiding part and the impeller and having an air suction hole in the center; and the motor driving the impeller to rotate. In the flow path from the inlet to the outlet formed by the front shielding surface, the rear shielding surface, and the hub of the wind guide wheel, the cross-sectional area of the flow path perpendicular to the center of the flow path is from the inlet to the outlet monotonically increasing. In this way, the flow velocity generated by the flow inside the impeller will gradually decelerate in the entire flow path area from the inlet to the outlet, and there will be no repeated acceleration and sudden deceleration, so the blowing efficiency can be fully improved.

Specifically, the second aspect of the present invention is that the monotonous increase of the cross-sectional area of the channel described in the first aspect is substantially linear. In this way, the flow velocity component caused by the flow inside the impeller is decelerated at a constant ratio with respect to the flow direction of the cross-section of the rotating shaft, and sudden deceleration and the like do not occur.

Specifically, the third aspect is that the monotonous increase in the cross-sectional area of the flow path described in the first or second aspect is different between the inlet of the impeller and the end of the hub, and between the end of the hub and the outlet. In this way, the two parts from the inlet to the end of the hub and from the end of the hub to the outlet can be designed separately, which can not only make the cross-sectional area of the flow path on the inlet side increase monotonously, but also reduce the inhaled air flow from the direction of the rotating shaft. Losses caused by peeling, vortex, and secondary flow that occur when turning to the radial direction can also be achieved. The cross-sectional area of the flow path on the outlet side can be increased monotonously, and the peeling that occurs until the airflow is discharged in the radial direction can also be reduced. The loss caused by the rotational friction between the vortex and the surface of the impeller and the air (disc rotational friction loss) can be expected to improve the blowing efficiency.

Specifically, the fourth aspect is that in the third aspect, the rate of change of the monotonous increase in the flow path cross-sectional area from the impeller inlet to the hub end portion is smaller than the monotonous increase in the flow path cross-sectional area from the hub end portion to the outlet. big. In this way, when the inhaled air flow is affected by the separation, vortex, and secondary air flow that occur when it is rotated from the direction of the rotation axis to the radial direction, the actual air flow area becomes smaller, and the monotonous increase in the cross-sectional area of the flow path can be minimized. It is basically close to a straight line, so that the flow velocity component caused by the flow inside the impeller can be decelerated at a constant ratio with respect to the airflow direction of the section of the rotating shaft, thereby avoiding the phenomenon of sudden deceleration.

Specifically, in the fifth aspect, in the first aspect, the monotonous increase of the cross-sectional area of the flow path in the first aspect is different from the inlet of the impeller to the end of the hub, and from the end of the hub to the outlet, and is basically approximately in the same direction. In addition, there is a curve change part connecting the monotonous increase of the cross-sectional area of the flow path on the inlet side and the outlet side near the terminal part of the hub. In this way, the cross-sectional area of the flow path can be smoothly changed from the impeller inlet to the hub terminal and from the hub terminal to the outlet, that is, the flow velocity component generated by the flow can be smoothly decelerated.

Specifically, the sixth aspect is that, in any one of the first to fifth aspects, parallel portions parallel to the direction of the rotation axis are respectively provided on the front shield surface of the impeller and the inlet portion of the hub. In this way, all airflows drawn in the direction of the axis of rotation at the impeller inlet can be smoothly transformed into radial airflows.

A seventh aspect is specifically that, in any one of the first to sixth aspects, the wind deflector is made of resin, and the front shielding surface, the rear shielding surface, and the blades are made of metal plates. In this way, the flow path on the inlet side of the impeller, that is, the wind guide wheel, and the flow path on the outlet side, that is, the metal plate part (the flow path sandwiched by the front shielding surface and the rear shielding surface) can be manufactured separately. As a result, the manufacture of the impeller can be simplified.

The eighth aspect is specifically that the electric vacuum cleaner of the present invention is provided with any one of the electric fans in the first to seventh aspects. In this way, not only the suction performance can be improved, but also the user can perform a comfortable vacuuming operation.

Description of drawings

Fig. 1 is a half-sectional view of an electric blower in Embodiment 1 of the present invention,

Figure 2 is a top view of the impeller in the electric fan after being partially cut off,

Fig. 3 is a sectional view of the impeller in the electric fan,

Fig. 4 (a) is the relationship figure between the distance calculated from the inlet on the flow path center curve of the impeller of the electric fan and the flow path cross-sectional area perpendicular to the flow path center curve; Fig. 4 (b) is The relationship between the distance calculated from the inlet on the flow path center curve of the impeller and the flow velocity parallel to the flow path center curve,

Fig. 5 (a) is the relationship figure between the distance calculated from the inlet on the flow path center curve of the impeller of the electric fan in Embodiment 2 of the present invention, and the flow path cross-sectional area perpendicular to the flow path center curve; Fig. 5 (b) is the relationship diagram between the distance calculated from the inlet on the flow path center curve of the impeller and the flow velocity parallel to the flow path center curve,

Fig. 6 (a) is another kind of impeller from the distance of the inlet on the flow path center curve, and the relationship diagram between the flow path cross-sectional area perpendicular to the flow path center curve; The relationship between the distance of the inlet of the flow path center curve and the flow velocity parallel to the flow path center curve,

Fig. 7 (a) is the cross-section of the electric fan impeller in the embodiment of the present invention 3; Fig. 7 (b) is the distance from the inlet on the flow path center curve of this impeller, and the perpendicular to the flow path center curve The relationship between the cross-sectional area of the flow path,

Fig. 8 (a) is the exploded cross-sectional view of the shape of the electric fan impeller in Embodiment 4 of the present invention; Fig. 8 (b) is the distance from the inlet on the flow path center curve of the impeller, and the flow path center curve The relationship diagram between the cross-sectional areas of the flow paths perpendicular to each other,

Fig. 9 is a sectional view of the electric vacuum cleaner in Embodiment 5 of the present invention,

Fig. 10 is a sectional view of an impeller in an existing electric fan,

Fig. 11(a) is a graph showing the relationship between the diameter of the impeller and the cross-sectional area of the flow path cylinder; Fig. 11(b) is a graph showing the relationship between the diameter of the impeller and the radial flow velocity.

In the above drawings, 1 is the impeller, 2 is the front shielding surface, 3 is the rear shielding surface, 4 is the blade, 5 is the inlet, 6 is the hub, 7 is the inlet guide wing, 8 is the wind guide wheel, 9 is the static wing, 10 is a base plate, 11 is an air guide, 12 is an air suction hole, 13 is a casing, 14 is a motor, 16 is a rotating shaft, 25 is an outlet, 26 is a hub terminal part, 27 is a curve changing part, 28 is a parallel part, 30 is an electric fan.

Detailed ways

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it should be pointed out that such examples do not limit the scope of the present invention.

(Example 1)

The electric blower in Embodiment 1 of the present invention is shown in Fig. 1 to Fig. 4 .

As shown in Figures 1 and 2, the electric fan in this embodiment includes: an impeller 1 with a front shielding surface 2, a rear shielding surface 3 and a plurality of blades 4 between the two shielding surfaces 2 and 3 ; There is a round hammer-shaped hilltop-shaped hub 6 arranged in the inlet 5 of the impeller 1, and a wind guide wheel 8 with a 3-dimensional curved surface and an inlet guide vane 7 coupled with the blade 4; The air guiding parts 11 of a plurality of stationary wings 9 and their base plates 10 around them; the housing 13 that wraps the air guiding parts 11 and the impeller 1 inside, and is provided with a suction hole 12 facing the inlet 5 in the center; and An electric motor 14 for driving the impeller 1 to rotate.

The front shield surface 2 , the rear shield surface 3 of the impeller 1 and the hub 6 of the wind deflector 8 form an air flow path from the inlet 5 to the outlet 25 . The cross-sectional area of the flow path perpendicular to the flow path does not become smaller, but has a continuously expanding structure, that is, a monotonously increasing structure in a broad sense.

In this embodiment, the front shielding surface 2, the rear shielding surface 3 and the plurality of blades 4 constituting the impeller 1 are all made of metal plates, and these three components are connected together by means of riveting or the like. The wind deflector 8 is made of resin, and when the three members (the front shield surface 2, the rear shield surface 3, and the blade 4) made of metal plates are connected, they are inserted inside and connected together. The wind deflector 8 is connected to the impeller 1 at its hub end portion 26 , and each inlet guide vane 7 is connected to each blade 4 respectively.

In addition, the rear shield surface 3 of the impeller 1 and the annular portion 15 inside the hub 6 are fixed on the rotating shaft 16 of the motor 14 by nuts 18 after a spacer 17 is interposed therebetween.

The hub 6 in the front shielding surface 2, the rear shielding surface 3 and the wind guide wheel 8 constitutes the air flow path from the inlet 5 to the outlet 25 in the impeller 1, and the cross-sectional shape of this flow path in the direction of the rotating shaft 16 (i.e. the axial center cross-sectional shape) as shown in Figure 3.

In detail, the above-mentioned flow path is divided into a curve 19 on the front side and a curve 20 on the back side. The above-mentioned front side curve 19 is a curve on the side of the flow path obtained when the cross section of the front shielding surface 2 is taken along the direction of the rotation axis 16. The side curve 20 is a curve on the side of the flow path obtained when a section is taken of the hub 6 and the rear shielding surface 3 extending from the hub 6 . The channel center curve 21 basically passes through the center between the above two curves. After obtaining a plurality of flow path section defining straight lines 22 perpendicular to the flow path center curve 21, the area of the circular curved surface obtained when the flow path section defining straight lines 22 are rotated around the rotation axis 16 is the flow path at each position. Road cross-sectional area.

As shown in FIG. 4( a ), the cross-sectional area of the flow path at each position is set to increase monotonously along the flow path center curve 21 of the impeller 1 from the inlet 5 to the outlet 25 , and make the change approximately linear. Thus, the change in flow velocity from the inlet 5 to the outlet 25 will decrease linearly as shown in Fig. 4(b).

In addition, the front side curve 19 and the rear side curve 20 are equally divided into equal parts, and the corresponding dividing points 23 are connected to form a dividing line 24, and the curve passing through the midpoint of these dividing lines 24 is the stream. Road Center Curve 21.

The operation and effect of the electric blower having the above-mentioned constitution will be described below.

During work, as shown in Figure 1 and Figure 2, the impeller 1 coupled with the motor 14 rotates at a high speed (arrow A in Figure 2), and sucks air from the suction hole 12 on the housing 13 (arrow A in Figure 1 B); Air is sucked into the inlet 5 on the impeller 1 again, and the air flow is turned from the direction along the rotating shaft 16 through the internal flow path surrounded by the front shielding surface 2, the hub 6 and 2 inlet guide wings 7 To (as shown by arrow C) flow along the radial direction; then, through the internal flow path (arrow D) surrounded by the front shield surface 2, the rear shield surface 3 and two blades 4, from the outer edge of the impeller 1 Partial discharge.

The airflow discharged from the impeller 1 passes between the stationary vanes 9 of the air guide part 11, hits the outer peripheral wall of the casing 13 (arrow E), and then passes through the inner side of the air guide part 11 (arrow F); Then, while passing through the inside of the motor 14 (arrow G), the motor 14 is cooled; finally, it is discharged from the exhaust hole provided on the motor 14 to the outside of the motor 14 (arrow H).

At this time, since the area of the cross-section of the flow path orthogonal to the flow path from the inlet 5 to the outlet 25 formed by the front shielding surface 2, the rear shielding surface 3 and the hub 6 in the wind guide wheel 8 is monotonically increasing, so by The flow velocity component generated by the flow inside the impeller 1 (that is, the component in the cross-sectional direction of the rotating shaft 16) will gradually decelerate in the entire flow path area from the inlet 5 to the outlet 25 (Fig. 4(b)), and no emergency will occur. deceleration phenomenon.

As mentioned above, in the impeller 1 of the present embodiment, by making the flow path (from the inlet 5 to the outlet 25 constituted by the front shield surface 2, the rear shield surface 3 and the hub 6 of the wind guide wheel 8) The cross-sectional area of the flow path increases monotonously, which can make the flow velocity of the components caused by the flow inside the impeller 1 (that is, the components in the cross-sectional direction of the rotating shaft 16) gradually decelerate in the entire flow path area from the inlet 5 to the outlet 25, so Sudden deceleration does not occur, and a sufficient improvement in blowing efficiency can be expected.

In addition, by setting the monotonous increase of the cross-sectional area of the flow path to be substantially linear as shown in FIG. The deceleration is performed at a constant ratio in the flow direction with respect to the section of the rotating shaft 16, so that sudden deceleration phenomena can be prevented.

(Example 2)

Next, Embodiment 2 of the present invention will be described according to FIG. 5 and FIG. 6 . Wherein, the basic structure of the electric blower is the same as that in Embodiment 1, so repeated description thereof will be omitted here.

In this embodiment, as shown in FIG. 5( a ), the flow path cross-sectional area of the impeller 1 varies within the range from the inlet 5 of the impeller to the hub end portion 26 and from the hub end portion 26 to the outlet 25. different from each other. Thus, the flow velocity from the inlet 5 to the outlet 25 parallel to the flow path center curve 21 of the impeller 1 will change as shown in FIG. 5( b ).

If this embodiment is adopted, the part from the inlet 5 to the hub terminal part 26 and the part from the hub terminal part 26 to the outlet 25 can be designed separately, which can not only realize the cross-sectional area of the flow path on the side of the inlet 5, but also reduce the intake air flow from the rotation. When the direction of the axis 16 is turned to the radial direction, the loss caused by the peeling, vortex, and secondary flow increases monotonously, and the cross-sectional area of the flow path on the outlet 25 side can also be reduced to the peeling that occurs until the radial direction is discharged. , vortex, and the rotational friction between the surface of the impeller 1 and the air (disc rotational friction loss), etc., the monotonous increase of losses can be expected to improve the blowing efficiency.

In this embodiment, the change rate of the monotonically increasing cross-sectional area of the flow path from the inlet 5 of the impeller 1 to the hub end portion 26 is greater than the monotonically increasing change rate of the flow path cross-sectional area from the hub end portion 26 to the outlet 25 .

In this way, when the inhaled air flow is affected by the separation, vortex, and secondary air flow that occur when it turns from the direction of the rotating shaft 16 to the radial direction, and the actual air flow area becomes smaller, the cross-sectional area of the flow path can be monotonically increased. The situation is basically close to a straight line, so that the flow velocity component (component along the direction of the cross section of the rotating shaft 16) caused by the flow inside the impeller 1 is decelerated at a constant ratio with respect to the airflow direction of the cross section of the rotating shaft 16, thereby avoiding emergencies. occurrence of deceleration.

In addition, as shown in Fig. 6 (a) (b), the monotonous increase of the cross-sectional area of the flow path in the impeller 1 of this embodiment can also be set such that the flow from the inlet 5 of the impeller 1 to the hub terminal portion 26 The part and the part from the hub end portion 26 to the outlet 25 can be different from each other, and they are approximately straight respectively; in addition, a curve change portion 27 is provided near the hub end portion 26, and this curve change portion 27 will be located at the entrance 5 One side is connected to a substantially linear flow channel cross-sectional area monotonously increasing portion on the outlet 25 side.

In this way, the cross-sectional area of the flow path will increase smoothly and monotonously from the inlet portion 5 of the impeller 1 to the hub end portion 26, and from the hub end portion 26 to the outlet 25, so that the flow velocity component due to the flow rate (along the The component in the cross-sectional direction of the rotating shaft 16) smoothly decelerates.

(Example 3)

Embodiment 3 of the present invention will be described below with reference to FIG. 7 . Wherein, the basic structure of the electric fan is the same as that in Embodiment 1, so repeated description thereof is omitted here.

As shown in Figure 7(a)(b), the front shielding surface 2 and the hub 6 in the impeller 1 of the present embodiment are respectively provided with a parallel portion 28 substantially parallel to the rotating shaft 16 near the end of the inlet 5, forming An annular suction channel parallel to the rotation axis 16.

In this way, the turbulent flow generated when the airflow is attracted towards the rotation axis 16 can be reduced at the inlet of the impeller 1, and all the airflow in the direction of the rotation axis 16 can be smoothly turned to the radial direction thereafter.

(Example 4)

Next, Embodiment 3 of the present invention will be described according to FIG. 8 . Wherein, the basic structure of the electric fan is the same as that in Embodiment 1, so repeated description thereof is omitted here.

The upper figure in Fig. 8(a) shows the wind deflector, and the lower figure shows the state when the impeller is not inserted into the wind deflector.

In this embodiment, the wind deflector 8 constituting the impeller 1 is made of resin, and the front shield surface 2, the rear shield surface 3, and the blades 4 are made of metal plates. In this way, after the impeller is inserted into the wind deflector, the cross-sectional area of the flow path at the hub terminal portion 26 can be obtained from a cross-section parallel to the direction of the rotating shaft 16 . In other words, when the rear shield surface 3 and the rotating shaft 16 are in a vertical positional relationship, the flow path section in the hub terminal portion 26 defines a straight line 22 (both on the side of the inlet guide vane 7 and the side of the blade 4 ). It is perpendicular to the rear shielding surface 3 .

In this way, the inlet 5 side of the impeller 1, that is, the flow path in the wind deflector 8, and the flow path in the outlet 25 side, that is, the metal plate part (by the front shielding surface 2 and The flow path sandwiched by the rear shielding surface 3) can be made separately, so that the impeller 1 can be made simply and conveniently.

(Example 5)

FIG. 9 shows an electric vacuum cleaner in Embodiment 5 of the present invention.

As shown in FIG. 9 , the main body 29 of the vacuum cleaner is provided with an electric blower 30 , which sucks the airflow and dust through the suction head 31 and accumulates the dust in the dust collection chamber 32 .

In addition, the electric blower 30 here is the electric blower shown in any one of the above-mentioned embodiments 1 to 4, so as to realize an electric vacuum cleaner that can not only improve dust collection performance, but also reduce energy consumption.

To sum up, since the electric blower in the present invention is expected to fully improve the blowing efficiency, it can not only be used in electric vacuum cleaners, but also be widely used in other household appliances, industrial equipment and other occasions. In addition, the present invention can also be applied to compressors, steam turbines, liquid pumps, and the like from a viewpoint similar to that of an electric fan.

Claims (8)

1. An electric fan, characterized in that it comprises: An impeller with a front shielding surface, a rear shielding surface and a plurality of blades located between the two shielding surfaces; a wind deflector with a hub located inside the inlet of said impeller; an air guiding member located on the periphery of the impeller; a housing that encloses the air guide member and the impeller and has an air suction hole in the center; and an electric motor driving the rotation of said impeller, In the flow path from the inlet to the outlet of the impeller formed by the front shield surface, the rear shield surface, and the hub of the wind guide wheel, the cross-sectional area of the cross-section orthogonal to the center of the flow path increases from the There is a monotonous increase from the inlet to the outlet. 2. The electric blower according to claim 1, wherein the monotonous increase of the cross-sectional area of the flow path is substantially linear. 3. The electric blower as claimed in claim 1 or 2, characterized in that: the monotonous increase of the cross-sectional area of the flow path is between the inlet of the impeller and the end of the hub, and between the end of the hub and the outlet. Are not the same. 4. The electric fan as claimed in claim 3, characterized in that: compared with the monotonous increase of the flow path cross-sectional area from the hub end to the outlet, the monotonous increase of the flow path cross-sectional area from the impeller inlet to the hub end portion The increased rate of change is larger. 5. The electric fan as claimed in claim 1, wherein the monotonous increase of the cross-sectional area of the flow path is different from the inlet of the impeller to the end of the hub and between the end of the hub and the outlet, and are substantially rectilinear respectively; In addition, a curve changing portion that couples the monotonous increase of the cross-sectional area of the flow path on the inlet side and the outlet side is provided near the terminal portion of the hub. 6. The electric fan according to claim 1 or 2, characterized in that: the front shielding surface of the impeller and the inlet part of the hub are respectively provided with parallel parts parallel to the direction of the rotation axis. 7. The electric blower according to claim 1 or 2, characterized in that: the wind guide wheel is made of resin, and the front shielding surface, rear shielding surface and blades are made of metal plates. 8. An electric vacuum cleaner, characterized in that the electric blower according to any one of claims 1-7 is provided therein.

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