CN110680229A - Electric fan and electric dust collector equipped with same - Google Patents

Abstract

The present invention provides an electric fan and an electric vacuum cleaner in which noise caused by vibration of a stator is reduced. The electric fan of the present invention comprises: a motor having a rotor iron core and a stator iron core; a rotating shaft arranged to be rotatable; the rotor iron core integrally formed near one end of the rotating shaft; a rotor near the other end of the rotor; a pair of bearings mounted on the rotating shaft between the rotor core and the rotor; a casing holding the pair of bearings; and a fan casing covering the rotor, The stator iron core is configured by connecting a plurality of divided iron cores having the same shape, and a bobbin serving as an insulating member covering each of the divided iron cores is arranged in the divided iron core, and there is a gap between the adjacent bobbins. connected connector.

Description

Electric blower and electric vacuum cleaner equipped therewith

technical field

The present invention relates to an electric fan and an electric vacuum cleaner equipped with the same.

Background technique

In recent years, cordless vacuum cleaners and self-propelled electric vacuum cleaners, which have been rapidly increasing in demand, are used to obtain sufficient output even with low-voltage battery drives and reduce vibration and noise. Electric fans using DC brushless motors are used.

In addition, in order to achieve downsizing of an electric vacuum cleaner, downsizing of an electric fan is also required. Regarding downsizing of the electric fan, the outer diameter of the fan can be reduced by increasing the speed of the electric fan. Therefore, there is an example in which the rotational speed of the brushless motor is set to about 80,000 revolutions per minute or more.

As an electric fan for conventional electric vacuum cleaners, there is, for example, an electric fan disclosed in Japanese Patent Application Laid-Open No. 2016-153636 (Patent Document 1).

The electric blower disclosed in Patent Document 1 describes "comprising: a rotating shaft provided rotatably; a bearing portion provided at substantially the center of the axial direction of the rotating shaft; a centrifugal impeller provided at one end of the rotating shaft; The bearing portion of the rotating shaft is provided on the rotor core on the opposite side of the centrifugal impeller; the stator core is arranged so as to face the circumference of the rotor core; the ring member provided on the other end of the rotating shaft, the ring member It is composed of a non-magnetic material with a larger specific gravity than the above-mentioned rotor core.".

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2016-153636

SUMMARY OF THE INVENTION

The problem to be solved by the invention

The electric fan of Patent Document 1 can reduce the unbalance amount of the rotating body (rotor assembly) and reduce the vibration of the rotating body for balance adjustment by a ring member provided at the shaft end and a centrifugal impeller, and can perform a high speed of 80,000 revolutions per minute or more. Rotation and miniaturization of the electric fan. In addition, by reducing the rotational vibration, the operation sound of the vacuum cleaner is also reduced.

Here, when the electric fan operates, the electromagnetic force generated between the rotor iron core and the stator iron core periodically changes with the rotation of the rotor iron core. Due to this periodically changing electromagnetic force, the stator core may vibrate and noise may be generated.

In order to solve the above-mentioned problems, an object of the present invention is to provide a device capable of suppressing vibration generated from a stator portion and reducing noise, particularly noise at harmonics of the rotational frequency (integer multiples of the rotational frequency) with a simple structure. Electric blower and electric vacuum cleaner.

Technical solutions for solving problems

In order to solve the above-mentioned problems, one of the representative electric fans of the present invention is achieved by including: a motor having a rotor iron core and a stator iron core; a rotating shaft provided so as to be rotatable; and an integral part near one end of the rotating shaft A shaped rotor core; a rotor mounted near the other end of the rotating shaft; a pair of bearings mounted on the rotating shaft between the rotor core and the rotor; a housing holding the pair of bearings; and a fan casing covering the rotor The stator core is formed by connecting a plurality of divided cores of the same shape, and the divided cores have an annular yoke, a magnetic pole protruding from the yoke to the inner diameter side, and teeth formed at the tip end of the magnetic pole In the split core, a bobbin serving as an insulating member covering each split core is disposed, and a connecting portion is provided for connecting the tooth portions by the adjacent bobbins.

Invention effect

ADVANTAGE OF THE INVENTION According to this invention, the vibration of a motor stator part can be suppressed, and the reduction of noise, especially the reduction of the harmonic noise of a rotation frequency, and the electric vacuum cleaner provided with this can be provided.

Problems, structures, and effects other than those described above will become clear from the description of the following embodiments.

Description of drawings

Fig. 1(a) is an external view of an electric blower according to an embodiment of the present invention.

Fig. 1(b) is a vertical cross-sectional view of an electric fan according to an embodiment of the present invention.

Fig. 2(a) is a plan view of a stator core according to an embodiment of the present invention.

Fig. 2(b) is a perspective view of a split core constituting a stator core according to an embodiment of the present invention.

Fig. 3(a) is an exploded perspective view of the split core and the bobbin constituting the stator according to the embodiment of the present invention.

Fig. 3(b) is a perspective view after fitting the divided cores and the bobbins constituting the stator according to the embodiment of the present invention.

3( c ) is an external perspective view of a bobbin fitted to a split core constituting a stator according to an embodiment of the present invention, and a field coil is wound.

Fig. 4(a) is an external perspective view of the stator according to the embodiment of the present invention as viewed from the side of the fan case.

Fig. 4(b) is a cross-sectional view of the stator according to the embodiment of the present invention.

Fig. 4(c) is an external perspective view of the stator according to the embodiment of the present invention as viewed from the opposite side of the fan casing.

FIG. 5 is a plan view seen from the stator side of the bobbin 10 according to the embodiment of the present invention.

Fig. 6(a) is an external view after fitting the two split cores.

Fig. 6(b) is an enlarged cross-sectional view of the tooth portion.

FIG. 7 is an external view of a bobbin fitted to a split core.

FIG. 8 is a frequency analysis result illustrating the noise reduction effect of the stator teeth restraint.

Fig. 9(a) is a perspective view showing an electric vacuum cleaner equipped with an electric fan according to an embodiment of the present invention and used as a rod type.

Fig. 9(b) is a side view showing the electric vacuum cleaner equipped with the electric fan according to the embodiment of the present invention, and the electric vacuum cleaner is used as a portable type.

Fig. 10 is a vertical cross-sectional view of a cleaner body on which the electric blower of the present embodiment is mounted.

Detailed ways

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In this embodiment example, the rotor is described using a centrifugal impeller.

Example 1

The electric blower 200 will be described with reference to the external view of the electric blower shown in FIG. 1( a ) and the vertical cross-sectional view of the electric blower shown in FIG. 1( b ). The electric fan 200 is roughly divided into a fan unit 201 and a motor unit 202 . The fan section 201 includes a centrifugal impeller 1 serving as a rotor, a fan casing 2 that accommodates the centrifugal impeller 1 , and a guide blade 3 having a plurality of diffuser blades 3 a and a plurality of return blades provided on the back surface of the diffuser blades 3 a Guide vane 3b. The fan case 2 is provided with an air intake port 2a. On the inner surface of the fan case 2 , an airtight holding member 2 b using an elastic body is integrally formed with the fan case 2 . In this embodiment, the airtight holding member 2b and the fan case 2 are integrally formed by insert molding.

The centrifugal impeller 1 is made of thermoplastic resin, and is directly connected to the rotating shaft 4 . Here, in this embodiment, the centrifugal impeller 1 serving as a rotor is press-fitted and fixed to the rotating shaft 4 , but a screw may be provided at the end of the rotating shaft 4 and the centrifugal impeller 1 may be fixed with a fixing nut.

The motor unit 202 includes the rotor core 6 fixed to the rotating shaft 4 accommodated in the casing 5 , and the stator 7 fixed to the casing 5 .

The rotor core 6 is formed on the end portion of the rotating shaft 4 opposite to the end portion to which the centrifugal impeller 1 is fixed, and is composed of a rare earth-based bonded magnet. Rare earth based bonded magnets are produced by mixing rare earth magnetic powder and an organic binder. As the rare earth-based bonded magnet, for example, a samarium iron nitrogen magnet, a neodymium magnet, or the like can be used. The rotor core 6 is integrally formed with the rotating shaft 4 . In this embodiment, the rotor core 6 uses permanent magnets, but it is not limited to this, and for example, a reluctance motor, which is a type of reluctance motor capable of high-speed rotation of 80,000 revolutions per minute or more, may be used.

The stator 7 is arranged on the outer peripheral side of the rotor core 6 , and is fixed to the casing 5 with fixing screws 8 . The stator 7 is provided with a stator core 9 ( FIG. 2 ) formed by laminating electromagnetic steel sheets in the direction of the rotation axis, and two winding frames 10 and 11 are arranged around the stator core 9 , and the winding frames 10 and 11 are interposed therebetween. The field winding 12 is wound. Field winding 12 is electrically connected to a circuit portion (not shown) of electric fan 200 .

Bearings 13 and 14 are provided between the centrifugal impeller 1 and the rotor core 6, and the rotating shaft 4 is rotatably supported. Between the bearing 13 and the bearing 14, the spring 15 is arrange|positioned in a compressed state, and the bearing 13 and 14 are preloaded. The bearings 13 and 14 and the spring 15 are enclosed in the bearing cover 16 . A ring 17 for balance adjustment is attached to the end of the rotating shaft 4 rather than the rotor core 6 . By rotating the rotating body and cutting the back surface of the centrifugal impeller 1 and the ring 17 , it is possible to perform balance correction on both surfaces. The balance adjustment ring 17 is produced from a metal material having a larger specific gravity than the rotor core 6 , for example, by a sintered product or machining of a copper material.

A positioning sleeve 18 for the bearing 14 is arranged between the rotor core 6 and the bearing 14 . The housing 5 is made of a synthetic resin material, and has a support portion 19 to which a bearing cap 16 enclosing the bearings 13 and 14 is fixed. The bearing cover 16 is made of a non-magnetic metal material, and is integrated with the resin case 5 by insert molding. Further, the bearing cover 16 is preferably made of a material with high thermal conductivity such as aluminum alloy.

A screw hole 20 extending in the direction of the rotation axis is formed at the end of the support portion 19 of the resin case 5 . The fixing screws 21 can be screwed into the threaded holes 20 , and the guide wings 3 are fixed to the resin case 5 by screwing the fixing screws 21 . The casing 5 is provided with an opening 22 and an exhaust port 23 for discharging air to the outside of the electric fan 200 so that air flows into the casing 5 . The stator core 9 and the bobbin 11 of the stator 7 arranged at the end of the casing 5 are fixed to the casing 5 by the fixing screws 8 .

Next, the flow of air in electric fan 200 will be described. When the motor unit 202 is driven to rotate the centrifugal impeller 1 as a rotor, air flows into the centrifugal impeller 1 from the air intake port 2 a of the fan casing 2 . The inflowing air is pressurized and accelerated in the centrifugal impeller 1 , and flows out from the outer periphery of the centrifugal impeller 1 . The air flow out of the centrifugal impeller 1 is guided by the guide vanes 3 .

The guide vane 3 is provided with a plurality of diffuser vanes 3a, and the airflow is decelerated between the vanes of the diffuser vanes 3a, thereby converting the kinetic energy of the airflow into pressure energy, thereby increasing the pressure. The air flow that has flowed out from between the diffuser blades 3 a flows back into the guide blades 3 b from the flow paths formed by the inner surface of the fan casing 2 and the guide blades 3 .

The diffuser blade 3a protrudes into the airtight holding member 2b of the fan case 2, thereby maintaining the airtightness between the fan case 2 and the diffuser blade 3a. Thereby, the leakage between the diffuser blades 3a of the guide vanes 3 can be prevented, and the fan efficiency can be improved. In addition, although the diffuser with vanes was used in this Example, a diffuser without a vane may be used.

The airflow passing through the return guide vanes 3 b flows into the casing 5 from the openings 22 of the casing 5 , and cools the cooling fins 24 of the bearing cover 16 , thereby cooling the bearings 13 and 14 via the bearing cover 16 . In addition, the rotor core 6 , the stator core 9 , the field winding 12 and the like are cooled and discharged to the outside. Thereby, each part in the casing 5 is cooled. A part of the air flow that has passed through the return guide vanes 3b is discharged to the outside from the exhaust port 23 of the casing 5 .

The stator 7 of the motor unit 202 according to an embodiment of the present invention will be described with reference to FIGS. 2 to 7 . 2( a ) is a plan view of the stator core 9 according to the embodiment of the present invention, FIG. 2( b ) is a perspective view of the split core 25 constituting the stator core 9 , and FIG. 3( a ) is a split constituting the stator 7 An exploded perspective view of the iron core 25, the bobbin 10, and the bobbin 11, FIG. 3(b) is a perspective view of the split iron core 25, the bobbin 10, and the bobbin 11 being fitted, FIG. 3(c) It is an external perspective view of the bobbin 10, the bobbin 11 and the wound field winding 12 fitted to the split iron core 25. FIG. 4(a) is an external perspective view of the stator 7 viewed from the side of the fan casing 2, (b) is a sectional view of the stator 7, FIG. 4(c) is an external perspective view of the stator 7 viewed from the opposite side of the fan casing 2, FIG. 5 is a plan view of the bobbin 10 viewed from the stator 7 side, and FIG. 6(a) ), and FIG. 6(b) is an enlarged cross-sectional view of the stator teeth. FIG. 6( a ) is an external view in which two split cores are fitted, and FIG. 6( b ) is an enlarged cross-sectional view of a tooth portion. FIG. 7 is an external view of the bobbin 10 being wound around the split iron core 25 .

First, the stator core 9 constituting the stator 7 according to an embodiment of the present invention will be described with reference to FIG. 2 . The stator core 9 of one Example of this invention is comprised by connecting the divided cores 25 of the same shape. The divided iron cores 25 are formed by stacking electromagnetic steel sheets in the direction of the rotation axis, and the electromagnetic steel sheets are fixed to each other by the caulking portion 26 . The split core 25 includes a yoke portion 27 , a magnetic pole portion 28 , and a tooth portion 29 . A slit portion 30 for inserting the field winding 12 is formed by the space surrounded by the yoke portion 27 , the magnetic pole portion 28 , and the tooth portion 29 of each of the divided cores 25 .

A substantially rectangular groove portion 31 for connecting the split cores 25 to each other is provided at an end portion in the circumferential direction of the yoke portion 27 , and a substantially rectangular projection portion 32 is provided at the other end portion. The stator core 9 is integrally formed by fitting the divided cores 25 . Further, in the stator 7 , the bobbins 10 and 11 are arranged on the respective split cores 25 (see FIG. 3( b )), and the field coil 12 is wound around the magnetic pole portions 28 of the split cores 25 via the bobbins 10 and 11 . After that (see FIG. 3( c )), the divided cores 25 are connected and integrally formed. A through hole 33 for fixing to the casing 5 is provided on the outer diameter side of the center in the circumferential direction of the yoke 27 of the split core 25 , and is fixed to the casing 5 together with the bobbin 11 with the fixing screw 8 .

By using the stator core 9 as the divided core 25, compared with the case where the stator core 9 is provided as an integral core, the material utilization rate of the electromagnetic steel sheet can be improved, and the material cost can be reduced. In addition, since the periphery of the magnetic pole portion 28 around which the field coil 12 is wound is open, the winding process can be easily performed, and the productivity can be improved. In addition, since the field winding 12 can be easily wound neatly, the length of the field winding 12 can be shortened, and the efficiency of the electric fan 200 can be improved.

In addition, by providing the caulked portions 26 of the respective split cores 25 at both end sides of the yoke portion 27 and at three locations of the magnetic pole portion 28, the rigidity of the split core 25 alone is improved. The substantially rectangular grooves 31 and the substantially rectangular protrusions 32 at the circumferential ends of the respective divided cores 25 allow the divided cores 25 to be firmly connected to each other without welding or the like, and the integral stator core 9 can be improved. rigidity. Here, in this embodiment, the circumferential ends of the split iron cores 25 are connected by the substantially quadrangular grooves 31 and the substantially quadrangular protrusions 32, but may be substantially trapezoidal, triangular, or elliptical. , as long as the split cores 25 can be firmly connected to each other.

Next, the stator 7 according to an embodiment of the present invention will be described with reference to FIGS. 3 to 7 . Two bobbins 10 and 11 are arranged around the split iron core 25 according to an embodiment of the present invention. The bobbin 10 and the bobbin 11 are made of insulating synthetic resin material, and are fitted to prevent direct contact between the field winding 12 and the split core 25 . In addition, the split iron core 25 shown in FIG.3(a) integrates the laminated electromagnetic steel sheets, and is shown.

The bobbin 10 and the bobbin 11 may be formed easily and have electrical insulating properties, heat resistance and rigidity to a certain extent. For example, polybutylene terephthalate resin (PBT), Polyethylene terephthalate resins (PET) and resins containing glass fibers therein, and the like.

The bobbin 10 covers a part of the inner peripheral surface 27a on the inner diameter side of the yoke part 27 of the split core 25, a part of the inner diameter side of the upper surface 27b, and the magnetic pole part 28 in the direction indicated by the arrow A shown in FIG. The side surface 28a and the upper surface 28b and the side surface 29a and the upper surface 29b of the tooth part 29 are integrally formed. In addition, the coil guide 34 when the field coil 12 is wound is formed on the bobbin 10 . Fitting parts 35 and 36 are provided at the circumferential ends of the bobbins 10 covering the teeth 29 so as to connect the bobbins 10 to each other as shown in FIG. 5 . When the split cores 25 are joined, the fitting portions 35 and 36 are connected and constrained in the circumferential and radial directions. Thereby, the rigidity of the integral stator 7 can be improved.

The bobbin 11 covers a part of the outer peripheral surface 27c on the outer diameter side of the yoke portion 27 of the split core 25, the lower surface 27d, and the lower surface ( Not shown), the lower surface 29c of the tooth portion 29 is integrally formed. In addition, the bobbin 11 is provided with a coil guide 37 for winding the field coil 12 , and a mounting hole 38 for fixing the stator 7 is formed in the casing 5 (see FIG. 4( c )).

As shown in FIGS. 3( b ) and 3( c ), by fitting the bobbin 10 and the bobbin 11 to the split core 25 , the slit portion 30 is covered by the bobbin 10 and the bobbin having insulation properties. 11 is covered, so that the field winding 12 and the split iron core 25 do not come into direct contact with each other, so that electrical insulation can be performed. As a result, the field coil 12 can be wound around the split iron core 25 with strong tension, so that the split iron core 25 and the bobbin 10 and the bobbin 11 can be strongly adhered and integrated.

Winding guides 34 and 37 are formed on the bobbins 10 and 11, respectively, which serve as guides when the magnetic pole portion 28 is wound around the field winding 12, so that the field winding 12 can be prevented from being exposed on the side of the tooth portion 29, and the field winding 12 can be Strong tension winding.

The stator 7 is formed by fitting the bobbin 10 and the bobbin 11 to the split cores 25, winding the field coil 12, and then inserting the split cores 25 (FIG. 3(c)) into each other from the rotation axis direction. (Figure 5). At this time, since the fitting parts 35 and 36 of the bobbin 10 are also connected together, the rigidity of the integral stator 7 ( FIG. 4( c )) can be improved.

As shown in FIG. 5 , in the fitting parts 35 and 36 of the bobbin 10 , fitting parts 35 a and 35 b are formed on the fitting part 35 side, and fitting parts 36 a and 36 b are formed on the fitting part 36 side. As shown in FIG. 6, the circumferential direction is connected by the connection of the fitting parts 35a and 36a, and the radial direction is connected by the connection of the fitting parts 35b and 36b. Thereby, the teeth portions 29 are integrated, and the rigidity of the teeth portions 29 can be improved.

The fitting parts 35 and 36 of the bobbin 10 are not limited to the shapes shown in FIG. 5 , as long as the split core 25 can be inserted in the direction of the rotation axis, and the fitting parts 35 and 36 are firmly connected in the circumferential direction and the radial direction. That's it. For example, a substantially square groove shape, a substantially square projection shape, a substantially trapezoidal shape, a substantially triangular shape, a substantially elliptical shape, and the like may be employed.

As shown in FIG. 7 , a chamfer 39 is given to one end portion in the rotation axis direction of the fitting portions 35 and 36 of the bobbin 10 . When D is the intersection of the fitting portions 35 and 36 and the chamfer 39, the length from the other end to the intersection D with the chamfer 39 is L1, and the thickness of the stator core 9 is L2, It becomes L1<L2. That is, the length ( L1 ) in the rotation axis direction of the portion where the fitting portions 35 and 36 of the bobbin 10 are connected is shortened compared to the thickness L2 of the stator core 9 .

As a result, the stator 7 inserts and connects the divided cores 25 from the rotation axis direction, so that the grooves 31 and the protrusions that connect the divided cores 25 are located in front of the fitting parts 35 and 36 of the bobbin 10 . part 32 is connected. Moreover, since the chamfer 39 is formed in the end surface of the bobbin 10, the fitting parts 35 and 36 of the bobbin 10 can be smoothly connected, and the bobbins 10 can be connected together. Therefore, the manufacturing process of the stator 7 can be performed easily, and productivity can be improved.

Here, in this embodiment, the chamfer 39 of the bobbin 10 is an R-shaped chamfer, but it may be a straight chamfer or the like, as long as L1<L2 can be satisfied.

When the electric fan 200 is operated, an attractive force and a repulsive force are generated on the teeth 29 of the stator 7 by the electromagnetic force generated between the rotor core 6 and the teeth 29 of the stator 7 , and as the rotor core 6 rotates, Periodically varying forces are applied to the teeth 29 . Due to this periodically changing force, the stator core 9 vibrates, and the harmonic (integer multiple of the rotation frequency) noise of the rotation frequency is likely to be generated.

In the present embodiment, the bobbins 10 and 11 are formed by strongly adhering to the stator core 9 , and the fitting portions 35 and 36 can restrain the circumferential and radial directions of the teeth 29 and suppress the vibration of the stator 7 . , which can reduce the harmonic noise of the rotation frequency.

In addition, the length L1 of the bobbin 10 and the thickness L2 of the stator core 9 are set to L1<L2, and the chamfer 39 is formed on the end face of the bobbin 10. Therefore, the split cores 25 are connected first, and then the windings are connected. The rack 10 is good in assemblability. Therefore, the vibration generated from the stator part 29 can be suppressed by a simple structure, and the reduction of noise can be achieved.

FIG. 8 is a diagram showing the noise reduction effect of the teeth 29 of the bobbin 10 of the present invention constraining in the circumferential direction and the radial direction, and is the result of frequency analysis of the operating sound. The horizontal axis represents the frequency, the vertical axis represents the sound pressure level, the solid line represents the result of constraining the tooth portion of the present embodiment, and the broken line represents the result of removing the constraint of the tooth portion. It can be seen that the rotation frequency noise and the noise of the harmonics of the rotation frequency increase when the teeth 29 are not restrained, but the teeth of the stator 7 are restrained by the fitting parts 35 and 36 of the bobbin 10 of the present embodiment. 29. Harmonic noise is greatly reduced. By reducing the harmonic noise, the auditory feeling becomes good.

According to the electric fan 200 of the present embodiment described above, by using the stator core 9 as the split core 25, the material utilization rate of the electromagnetic steel sheet can be improved, and the material cost can be reduced. In addition, the winding process of winding the field winding 12 can be easily performed, and productivity can be improved. In addition, since the field winding 12 can be easily wound neatly, the length of the field winding 12 can be shortened, and the efficiency of the electric fan 200 can be improved.

In addition, by providing the caulking portion 26 in each of the divided iron cores 25, the rigidity of the divided iron core 25 alone is improved. In addition, the grooves 32 and the protrusions 33 at the circumferential ends of the split cores 25 can firmly connect the split cores 26 to each other without welding or the like, thereby improving the rigidity of the integral stator core 9 .

In addition, the coil guides 34 and 37 are formed on the bobbins 10 and 11, respectively, so that the field coil 12 can be prevented from being exposed on the tooth portion 29 side, and the field coil 12 can be wound with strong tension, so that the split core 25 can be wound. The bobbin 10 and the bobbin 11 are strongly adhered and integrated.

In addition, by connecting the fitting portions 35 and 36 of the bobbin 10, the circumferential direction and the radial direction of the tooth portion 29 can be connected, and the tooth portion 29 can be integrated. Thereby, the rigidity of the teeth part 29 can be improved, the vibration generated from the stator part 29 can be suppressed by a simple structure, and the reduction of noise can be aimed at.

In addition, the length L1 of the bobbin 10 and the thickness L2 of the stator core 9 are set to L1<L2, and the chamfer 39 is formed on the end face of the bobbin 10. Therefore, the split cores 25 are connected first, and then the windings are connected. Since the rack 10 has good assemblability, productivity can be improved.

Next, an electric vacuum cleaner 400 according to an embodiment of the present invention will be described with reference to the drawings with reference to FIGS. 9 and 10 .

In addition, in the following, the case where it is applied to the rechargeable vacuum cleaner 400 which can be appropriately switched between a stick type and a portable type and can be used will be described as an example, but it can be applied to various types of vacuum cleaners such as stick type only, portable type only.

Fig. 9 shows an electric vacuum cleaner equipped with the electric fan according to the present embodiment, Fig. 9(a) is a perspective view when the electric vacuum cleaner is used as a stick type, and Fig. 9(b) is a side view when the electric vacuum cleaner is used as a portable type. .

As shown in FIG. 9( a ), the vacuum cleaner 400 includes a vacuum cleaner body 410 that accommodates a dust collecting chamber 401 for collecting dust and an electric fan 200 ( FIG. 1 ) that generates a suction air flow necessary for collecting dust, and is expandable and contractible with respect to the vacuum cleaner body 410 A telescopic tube 402 provided on the ground, a handle portion 403 provided at one end of the telescopic tube 402 , and a switch portion 404 for turning on and off the electric fan 200 provided in the handle portion 403 are constituted.

The vacuum cleaner 400 shown to Fig.9 (a) is a stick state, and the expansion-contraction tube 402 is a state. In addition, the suction port body 405 is attached to the other end of the cleaner body 410 , and the cleaner body 410 and the suction port body 405 are connected by the connection part 406 .

The electric vacuum cleaner 400 shown in FIG.9(b) is a portable state, and the telescopic tube 402 is accommodated in the vacuum cleaner main body 410, and the handle part 403 is a state close to the telescopic tube 402 side. Moreover, the carrying handle part 407 which becomes a handle in a carrying state is provided between the handle part 403 and the dust collecting chamber 401 which are close to the upper surface side of the cleaner body 410 . Moreover, the suction port body (gap nozzle) 408 is attached to the other end part of the cleaner main body 410, and the cleaner main body 410 and the suction port body 408 are connected by the connection part 406.

In the electric vacuum cleaner 400 described above, by operating the switch portion 404 of the handle portion 403, the electric fan 200 (refer to FIG. 1 ) housed in the cleaner body 410 operates to generate an intake air flow. Then, the dust is sucked from the suction mouth bodies 405 and 408 and collected in the dust collecting chamber 401 of the cleaner body 410 through the connection part 406 .

Fig. 10 is a vertical cross-sectional view of a cleaner body on which the electric blower of the present embodiment is mounted. In addition, FIG. 10 is a portable state, and is the state which removed the suction port body 408 from the cleaner main body 410. As shown in FIG.

As shown in FIG. 10 , inside the cleaner body 410, there are provided an electric fan 200 that generates a suction force, a battery unit 420 that supplies power to the electric fan 200, and a driving circuit 430.

The air sucked from the suction mouth bodies 405 and 408 (refer to FIGS. 9(a) and 9(b) ) is sent to the front of the electric blower 200 through the flow path 440 (refer to FIG. 9(a) ) provided in the cleaner body 410 the dust collection chamber 401, and the dust is collected in the dust collection chamber 401. Then, the air after dust separation in the dust collecting chamber 401 passes through the electric fan 200 and the driving circuit 430, and is discharged to the outside from an exhaust port (not shown) formed in the cleaner body 410.

By mounting the electric blower 200 of the present embodiment in the vacuum cleaner, the harmonic noise of the rotation frequency of the vacuum cleaner 100 can be reduced, and the vacuum cleaner having a good sense of hearing can be obtained.

In addition, this invention is not limited to the above-mentioned Example, Various modification examples are included. For example, the above-described embodiments are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of a certain embodiment may be replaced with the configuration of another embodiment, and the configuration of another embodiment may be added to the configuration of a certain embodiment. In addition, a part of the structure of each embodiment can be added, deleted, or replaced with other structures.

Description of reference numerals

1 Centrifugal impeller

2 fan housing

3 guide wings

4 axis of rotation

5 shell

6 rotor core

7 Stator

8 Set screws

9 Stator core

10, 11 Winding frame

12 Field winding

13, 14 Bearings

15 spring

16 Bearing cap

17 gimbal

18 Sleeves

19 Housing support

20 tapped holes

21 Set screws

22 Housing opening

23 Housing exhaust port

24 Cooling fins

25 split core

26 Riveting part

27 Yoke

28 Magnetic pole part

29 teeth

30 slit

31 Groove

32 Protrusions

33 Through hole

34, 37 Winding guide

35, 36 Fitting part

38 Mounting holes

39 Chamfer

200 Electric fans

201 Fan Department

202 Motor Department

400 Electric Vacuum Cleaner Body.

Claims (4)

1. An electric blower, comprising:

a motor having a rotor core and a stator core;

a rotating shaft provided to be rotatable;

the rotor core integrally formed in the vicinity of one end of the rotating shaft;

a rotor mounted near the other end of the rotating shaft;

a pair of bearings mounted on the rotating shaft between the rotor core and the rotor;

a housing holding the pair of bearings; and

a fan housing covering the rotor, the fan housing,

the stator core is formed by connecting a plurality of divided cores having the same shape,

the split core has an annular yoke, a magnetic pole portion protruding from the yoke to an inner diameter side, and a tooth portion formed at a tip end portion of the magnetic pole portion,

the divided cores are provided with bobbins as insulating members covering the respective divided cores, and each of the divided cores has a connecting portion connecting the teeth portions by adjacent bobbins.

2. The electric blower of claim 1,

the connecting portion has a portion that contacts the tooth portion in the circumferential direction and the radial direction.

3. The electric blower of claim 1 or 2,

the length of the connection part is smaller than the thickness of the stator core.

4. An electric vacuum cleaner, characterized in that:

an electric blower according to any one of claims 1 to 3 is mounted thereon.

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