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WO2012132199A1 - Soufflante électrique et nettoyeur électrique utilisant celle-ci - Google Patents

Soufflante électrique et nettoyeur électrique utilisant celle-ci Download PDF

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Publication number
WO2012132199A1
WO2012132199A1 PCT/JP2012/001046 JP2012001046W WO2012132199A1 WO 2012132199 A1 WO2012132199 A1 WO 2012132199A1 JP 2012001046 W JP2012001046 W JP 2012001046W WO 2012132199 A1 WO2012132199 A1 WO 2012132199A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
frame
airflow
electric blower
impeller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/001046
Other languages
English (en)
Japanese (ja)
Inventor
渡邉　健一
宏昭 川崎
廣瀬　徹
村上　秀樹
祐一 吉川
香山　博之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Panasonic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2011067229A external-priority patent/JP2012202282A/ja
Priority claimed from JP2011067232A external-priority patent/JP2012202283A/ja
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of WO2012132199A1 publication Critical patent/WO2012132199A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/444—Bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the present invention relates to an electric blower used for a vacuum cleaner and the like and a vacuum cleaner using the same.
  • Motor of the electric blower used in a conventional electric vacuum cleaner is of a strong suction force and be of light weight are required in a small size.
  • brushless motors that improve the suction work rate and reduce the size and weight by rotating the electric blower at high speed (see, for example, Patent Document 1).
  • FIG. 12 is a partial cross-sectional view of an electric blower that cools air through a conventional motor.
  • a brushless motor of a conventional electric blower includes a rotor 101, a rotating shaft 102, a frame 105, a stator 115, a bearing 107 and a bearing 108, an impeller 109, an air guide 110, and a fan case 111. ing.
  • the rotor 101 is mounted on the rotating shaft 102.
  • the stator 115 includes a stator core 104 and a coil 103.
  • the frame 105 includes the rotor 101 and the stator 115.
  • the bearing 107 and the bearing 108 are rotatably connected to the frame 105 and the rotating shaft 102.
  • the impeller 109 is attached to the tip of the rotating shaft 102.
  • the impeller 109 includes a plurality of blades.
  • the air guide 110 is disposed on the outer periphery of the impeller 109.
  • the air guide 110 recovers the pressure of the air blown by the rotation of the impeller 109.
  • the air guide 110, the air flow of air flowing inside the air guide 110 is bent largely toward the rotary shaft 102.
  • the airflow moves to the inside of the brushless motor, to cool the stator 115 and the rotor 101.
  • the resin ring 112 is disposed at the air inlet of the fan case 111.
  • the main heat generating part of the motor is the armature, stator and commutator in the case of the universal motor, whereas the heat generating part when using the brushless motor is the stator.
  • air loss is reduced by blowing air along the outer periphery of the frame 105 of the motor.
  • FIG. 13 is a partial cross-sectional view of an electric blower that cools air through the periphery of a conventional motor.
  • the air guide 110 greatly bends the air blown by the rotation of the impeller 109 in the direction of the rotating shaft 102. As shown by the arrow in FIG. 13, this airflow flows through a ventilation hole (not shown) to a ventilation path 114 formed between the outer cylinder 113 and the frame 105.
  • the ventilation hole is provided in the bracket 106.
  • the coil 103 and the stator core 104 are the main heat generation points of the brushless motor.
  • the heat of the coil 103 and the stator core 104 is radiated to the air flowing through the ventilation path 114 via the frame 105.
  • pressure loss the pressure loss (hereinafter referred to as pressure loss) of the blast increases. Furthermore, since air passes through a small gap inside the brushless motor, further pressure loss occurs.
  • the air pressure loss in the ventilation path 114 can be kept low.
  • the heat generated in the coil 103 is radiated through the stator core 104 and the frame 105. For this reason, the heat dissipation efficiency is poor and the brushless motor cannot be sufficiently cooled. Therefore, if the pressure loss is reduced, the heat dissipation efficiency may be lowered.
  • JP 2003-135320 A Japanese Patent Laid-Open No. 11-336696
  • the present invention provides an electric blower that can reduce the size by reducing pressure loss of air blowing and efficiently cooling a brushless motor, and an electric vacuum cleaner using the electric blower.
  • An electric blower of the present invention includes a rotating shaft, a bearing that supports the rotating shaft, a rotor connected to the rotating shaft, a stator that has a plurality of coils, and is disposed to face the rotor, and a stator.
  • a brushless motor is provided that includes an inner frame and a frame that holds the bearing. Furthermore, it has the outer cylinder provided in the outer periphery of the flame
  • the ventilation path is configured between the outer cylinder and the frame.
  • the ventilation path is provided so that the airflow generated by the impeller fan flows along the outer periphery of the frame by the fan case and the air guide.
  • a plurality of side ventilation holes and end portions of the coils are provided at positions overlapping in the vertical direction with respect to the longitudinal direction of the rotating shaft.
  • the electric blower of the present invention can efficiently cool the coil of the motor while suppressing the pressure loss of the air flowing around the outer periphery of the frame, the electric blower can be miniaturized while suppressing a decrease in the blowing efficiency.
  • FIG. 1 is a partial cross-sectional view of the electric blower according to the first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG. 1, showing an air guide and an impeller portion of the electric blower according to the first embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of the brushless motor according to the first embodiment of the present invention.
  • FIG. 4 is a partial cross-sectional view of the electric blower according to the second embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of a brushless motor according to the second embodiment of the present invention.
  • FIG. 6 is a partial cross-sectional view of the electric blower according to the third embodiment of the present invention.
  • FIG. 1 is a partial cross-sectional view of the electric blower according to the first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG. 1, showing an air guide and an impeller portion of the electric blow
  • FIG. 7 is a cross-sectional view taken along section 7-7 in FIG. 6 showing the air guide and impeller portion of the electric blower according to the third embodiment of the present invention.
  • FIG. 8A is a plan view of a frame end surface portion of the brushless motor according to the third embodiment of the present invention.
  • FIG. 8B is a plan view of a frame end surface portion of the brushless motor according to the third embodiment of the present invention.
  • FIG. 9 is a cross-sectional view of a brushless motor according to the third embodiment of the present invention.
  • FIG. 10 is a partial cross-sectional view of an electric blower according to the fourth embodiment of the present invention.
  • FIG. 11 is a cross-sectional view of a brushless motor according to the fourth embodiment of the present invention.
  • FIG. 12 is a partial cross-sectional view of an electric blower that cools air through a conventional motor.
  • FIG. 13 is a partial cross-sectional view of a conventional electric blower that cools air through the perip
  • FIG. 1 shows a partial cross-sectional view of an electric blower according to a first embodiment of the present invention.
  • the electric blower 22 in the first embodiment includes a brushless motor 116, an impeller 9, an air guide 10, a fan case 11, an outer cylinder 13, a ventilation path 14, and side ventilation holes. 15.
  • the brushless motor 116 includes the rotor 1, the rotating shaft 21, the stator 24 having the coil 3 and the stator core 4, the frame 5, the bearing 77 and the bearing 8.
  • the rotor 1 is arranged fixed to the rotating shaft 21.
  • the stator 24 includes a stator core 4 and a coil 3 wound around the stator core 4.
  • the stator 24 is disposed on the outer peripheral side of the rotor 1. As shown in FIG. 3, the coil 3 is divided into a first independent coil 26, a second independent coil 27, and a third independent coil 29 and is wound around the stator core 4.
  • the number of divisions of the coil 3 is not limited to three, that is, the first independent coil 26, the second independent coil 27, and the third independent coil 29 as in the embodiment of the present invention. It is good if you do.
  • each end of the both ends of the coil 3 exposed to the outside of the stator core 4 is called an end of the coil, Sometimes called the end.
  • the end of the coil is the same as the end of the coil and is referred to as the end of the coil 3.
  • the stator core 4 is included in the frame 5 by shrink fitting or the like.
  • the frame 5 and the bracket 6 connected to the frame 5 hold the bearing 77 and the bearing 8.
  • the bearing 77 and the bearing 8 support the rotating shaft 21 in a freely rotatable manner.
  • the impeller 9 has a plurality of blades and is fixed to the rotary shaft 21.
  • the air guide 10 is arranged around the impeller 9 and gradually reduces the airflow discharged from the impeller 9 by a diffuser that is an independent air passage of a plurality of channels provided in the air guide 10 to perform pressure recovery. .
  • the fan case 11 contains the impeller 9 and the air guide 10.
  • the fan case 11 has an air inlet for allowing air to flow into the center.
  • the resin ring 12 is disposed at the air inlet of the fan case 11. The resin ring 12 minimizes the gap between the fan case 11 and the impeller 9. This prevents air leakage.
  • the outer cylinder 13 is connected to the fan case 11 on the outer peripheral side of the frame 5.
  • the ventilation path 14 is configured between the outer cylinder 13 and the frame 5.
  • Air passage 14 the airflow generated by the impeller 9, the fan case 11 by the air guide 10 is provided so as to flow along the outer periphery of the frame 5. The airflow discharged from the impeller 9 is guided to the ventilation path 14 through the air guide 10.
  • a plurality of side ventilation holes 15 are provided on the outer peripheral surface of the frame 5 at positions where the ends of the coils 3 are exposed.
  • the side ventilation hole 15 and the end of the coil 3 are provided at a position overlapping in the vertical direction with respect to the longitudinal direction of the rotating shaft 21.
  • the end portion of the coil 3 indicates the end portion of the coil 3 wound around the stator core 4 exposed outside the stator core 4 as indicated by symbol A in FIG.
  • One of the main heat sources of the brushless motor 116 is the stator coil 3.
  • the coil 3 is directly cooled by this airflow. For this reason, the heat of the coil 3 is efficiently transmitted from the coil 3 to the air. Thereby, the coil 3 is cooled.
  • a plurality of side ventilation holes 15 may be provided for the end of the coil 3.
  • coil 3 is concentrated winding coil, the airflow from the impeller 9 can shed intensively to the coil 3 is a heat source. For this reason, it is possible to cool the brushless motor 116 more efficiently while ensuring the rigidity of the frame 5.
  • Rotating airflow is generated by the rotation of the impeller 9. This airflow strikes the end of the coil 3 from the side vent hole 15. The coil 3 is directly cooled by this airflow. For this reason, the coil 3 is efficiently cooled.
  • the airflow is a swirling airflow, the airflow that hits the end of the coil from the side ventilation holes tends to flow out to the outer periphery of the frame 5 immediately. Thereby, an increase in pressure loss can be suppressed. Therefore, it can suppress that the ventilation efficiency of the electric blower 22 falls.
  • the coil 3 can be efficiently cooled.
  • FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG. 1, showing an air guide and an impeller portion of the electric blower according to the first embodiment of the present invention.
  • the airflow discharged from the impeller 9 toward the outer periphery of the impeller 9 is gradually recovered in pressure by the air guide 10. Thereafter, the airflow flows as a swirling airflow into the ventilation path 14 provided inside the outer cylinder 13. Airflow is introduced inside the side ventilation holes 15 of the frame 5 by the swirling airflow generated in the ventilation path 14.
  • FIG. 3 is a cross-sectional view of the brushless motor according to the first embodiment of the present invention.
  • the stator 24 may have a configuration including a first independent coil 26 and a second independent coil 27 which are a plurality of independent concentrated winding coils.
  • the side ventilation hole 15 may be configured to be provided between the first independent coil 26 and the second independent coil 27 with respect to the vertical direction of the rotating shaft 21. In other words, side vents 15, the position of the gap formed between the ends of the plurality of coils 3 which are the concentrated winding is provided to fit.
  • the side ventilation hole 15 is provided between the first independent coil 26 and the second independent coil 27, so that the airflow entering the inside of the brushless motor 116 from the concave portion at the end of the coil 3. Will increase.
  • the coil 3 can be more efficiently cooled by the airflow.
  • the swirling airflow has three main airflows.
  • the first airflow flows into the brushless motor 116 from the side vent hole 15, contacts the end of the coil 3, and flows out of the brushless motor again.
  • the second air flow is to pass through the ends of the coil 3, between the frame 5.
  • the third airflow is directed from the gap between the end portions of the coil 3 to the outside of the brushless motor 116 again through the inner peripheral side of the coil 3.
  • the frame 5 has an edge 16.
  • the edge 16 is located at an end of the side ventilation hole 15 on the upstream side with respect to the flow of the swirling airflow flowing through the frame 5.
  • the edge 16 has a sloped shape facing the outer peripheral side of the frame 5.
  • the swirling airflow flows along the shape of the frame 5. Further, the swirling airflow flows along the shape of the slope of the edge 16. For this reason, the swirl airflow is easily introduced from the side ventilation holes 15 to the inner peripheral side of the frame 5.
  • the air flow is increased in contact with the coil 3, the cooling performance of the brushless motor 116 can be improved.
  • the frame 5 has an edge 17.
  • the edge 17 is located at the end of the side ventilation hole 15 on the downstream side with respect to the flow of the swirling airflow flowing through the frame 5.
  • the edge 17 is bent and provided so as to protrude toward the outer peripheral side of the frame 5.
  • the inner corner of the fan case 11 facing the outer peripheral side of the air guide 10 may be a curved surface.
  • This curved surface may be provided so as to gradually change the airflow passing through the air guide 10. Thereby, the pressure loss of airflow can be reduced.
  • pressure loss can be reduced by making the inner corner of the fan case 11 facing the outer peripheral side of the air guide 10 a curved surface so that the airflow passing through the air guide 10 is gradually changed.
  • the electric blower 28 of the present embodiment is different from the electric blower described in the first embodiment, and the outer cylinder 213 includes a sound absorbing material 18.
  • FIG. 4 shows a partial cross-sectional view of the electric blower according to the second embodiment of the present invention.
  • the brushless motor 216 includes the rotor 1, the rotating shaft 21, the stator 24, the frame 205, the bearing 77, and the bearing 8.
  • the outer cylinder 213 is connected to the fan case 11 and provided on the outer peripheral side of the frame 205.
  • the sound absorbing material 18 is connected to the inside of the outer cylinder 213.
  • the sound-absorbing material 18 usually has sufficient rigidity to allow airflow to pass.
  • the ventilation path 214 is formed between the outer cylinder 213 and the sound absorbing material 18 and the frame 205.
  • the airflow discharged from the impeller 9 is guided to the ventilation path 214 through the air guide 10.
  • a plurality of side ventilation holes 215 are provided on the outer peripheral surface of the frame 205 at a position where the end of the coil 3 is exposed.
  • the arrows shown in FIG. 4 indicate the flow of airflow.
  • a part of the airflow passing through the side vent holes 215 and contacting the end of the coil 3 passes through the brushless motor 216 to cool the stator 24 and the rotor 1.
  • Most of this air flow, internal gaps of the brushless motor 216, is smaller than the air passage 214, the flow returns to the ventilation passage 214 again.
  • the sound absorbing material 18 is provided in the ventilation path 214, the dimension which a sufficient airflow flows is ensured. Further, the sound absorbing material 18 increases the proportion of the airflow flowing along the frame 5. The sound absorbing member 18, because the air flow is regulated to flow in a direction to approach the frame 205.
  • the airflow discharged from the impeller 9 is discharged as a swirling airflow through the air guide 10 and to the ventilation path 214 as in FIG. 2 of the first embodiment. Therefore, the airflow flows into the side vent holes 215 of the frame 5 by the whirling airflow.
  • FIG. 5 is a cross-sectional view of a brushless motor according to the second embodiment of the present invention.
  • the side ventilation holes 215 provided in the frame 205 are located at the end of the coil 3 that is concentrated winding, at the point where the vertical distance from the rotation axis is substantially the longest, that is, at the end of the coil 3. It arrange
  • the stator 24 may be provided with the stator core 4, the teeth 20, and the grooves 19.
  • the groove 19 may be configured to communicate with both end faces of the stator core 4 in the direction of the rotation shaft 21.
  • the stator core 4 is made of a magnetic material.
  • the stator core 4 has teeth 20 that protrude toward the inner peripheral side of the coil 3.
  • a coil 3 is wound around the teeth 20.
  • the groove 19 is an outer peripheral surface of the stator core 4 and is provided on a rotating shaft 21 passing through the center of the teeth 20 and a vertical extension line.
  • the groove 19 is not limited to this, and may be any size and shape that does not cause a problem as the magnetic circuit of the stator core 4. Further, if the groove 19 forms a passage between the frame 205 and the stator core 4 and communicates with the end faces on both sides of the stator core 4, the same effect can be obtained in other shapes. Is obtained.
  • the frame 5 may be provided with the edge 16 and the edge 17 described in the first embodiment. Thereby, since the airflow which contacts the coil 3 increases further, cooling performance improves.
  • FIG. 6 shows a partial cross-sectional view of an electric blower according to the third embodiment of the present invention.
  • the electric blower 33 includes a side ventilation hole 315 and an end ventilation hole 30. Further, the side ventilation holes 315 are arranged at positions of gaps formed between the ends of the plurality of coils 3.
  • the electric blower 33 includes a brushless motor 316, an outer cylinder 313, a ventilation path 314, a side ventilation hole 315, and an end ventilation hole 30.
  • the brushless motor 316 includes a rotor 1, a rotating shaft 21, a stator 24, a frame 305, a bracket 6 connected to the frame 305, a bearing 77, and a bearing 8.
  • the frame 305 includes a side ventilation hole 315 and an end surface ventilation hole 30.
  • Outer tube 313 is connected to the fan case 11 is provided on the outer peripheral side of the frame 305.
  • the ventilation path 314 is formed between the outer cylinder 313 and the frame 305.
  • a plurality of side ventilation holes 315 are provided on the outer peripheral surface of the frame 305 at a position where the end of the coil 3 is exposed.
  • a part of the airflow flowing along the frame 305 is one of the main heat sources of the brushless motor 316 by hitting the end of the coil 3 through the side ventilation holes 315.
  • the coil 3 is directly cooled. Thereby, the coil 3 can be cooled efficiently.
  • the airflow passing through the inside of the brushless motor 316 and most of the airflow entering the inside of the motor from the side ventilation holes 315 are discharged to the end surface ventilation holes 30 provided on the frame end surface.
  • the airflow entering the motor from the side ventilation holes 315 located on the downstream side the inside of the brushless motor 316 can be smoothly passed. This reduces the pressure loss of the airflow. For this reason, the opportunity for the airflow to touch the end of the coil 3 increases.
  • the shortest length from the center of the rotating shaft 21 to the inner peripheral surface of the end surface ventilation hole 30 is shorter than the length from the center of the rotating shaft 21 to the end of the inner peripheral surface of the coil 3. That is, the end surface ventilation hole 30 is provided at a position where at least the inner peripheral side of the end portion of the coil 3 is exposed when viewed from the rotation axis direction. As a result, a component is created in which the airflow entering from the side ventilation holes on the outer peripheral surface of the frame escapes to the end surface ventilation holes 30 on the end face of the frame so as to get over the crest at the end of the coil 3.
  • FIG. 7 is a cross-sectional view taken along section 7-7 in FIG. 6 showing an air guide and an impeller portion of an electric blower according to a third embodiment of the present invention.
  • the airflow discharged from the impeller 9 toward the outer periphery is gradually recovered by the air guide 10. Thereafter, the airflow flows as a whirling airflow to the ventilation path 314 inside the outer cylinder 313.
  • the swirl airflow generated inside the ventilation path 314 introduces the airflow inside the side ventilation holes 315 provided in the frame 305.
  • FIG. 8A is a plan view of a frame end surface portion of the brushless motor 316 according to the third embodiment of the present invention.
  • FIG. 8A is an example showing a case where the end surface ventilation holes 30a are substantially the same size
  • FIG. 8B is an example showing a case where the end surface ventilation holes 30b are circular in two sizes.
  • the end face ventilation hole 30a has a fan shape.
  • the fan-shaped long arc is arranged so as to be located substantially on the same circumference from the rotating shaft 21.
  • the frame 305 includes a first end face 300 provided in the direction of the impeller 9 and a second end face 301 provided on the side facing the first end face 300.
  • one or more end surface ventilation holes 30 a are provided on the second end surface 301 of the frame 305.
  • the shortest length from the center of the rotating shaft 21 to the inner peripheral surface of the end surface ventilation hole 30a may be shorter than the length from the center of the rotating shaft 21 to the end of the inner peripheral surface of the coil 3.
  • the end face ventilation hole 30a is provided at a position where at least the inner peripheral side of the coil 3 of the stator 24 is exposed when viewed from the direction of the rotary shaft 21.
  • FIG. 8B shows a configuration in which an end surface ventilation hole 30b having a large radius and an end surface ventilation hole 30b having a small radius are combined. Thereby, it becomes easy to control the path through which the airflow entering from the side vent holes 315 passes to the end face vent holes 30b. This is because the ease of airflow and the flow path of the airflow vary depending on the size of the end face ventilation holes 30b.
  • the main path of the air stream becomes longer because the air stream is mainly a swirling air stream.
  • the phase difference in the arrangement angle between the side ventilation holes 315 and the end face ventilation holes 30 is reduced, the main path is reduced. Thereby, the balance of the pressure loss with respect to an airflow and the effect which cools the edge part of the coil 3 can be adjusted.
  • FIG. 9 is a cross-sectional view of a brushless motor according to the third embodiment of the present invention.
  • the side ventilation holes 315 provided in the frame 305 are aligned with the positions of the gaps formed between the ends of the plurality of coils 3 that are concentratedly wound.
  • a plurality of side ventilation holes 315 and end portions of the coil 3 are provided at positions overlapping in the vertical direction with respect to the longitudinal direction of the rotating shaft 21.
  • the swirling airflow has three main airflows.
  • the first airflow flows into the brushless motor 316 from the side ventilation holes 315, contacts the end of the coil 3, and flows out of the brushless motor 316 again.
  • the second airflow passes between the end of the coil 3 and the frame 305.
  • the third airflow passes from the gap between the end portions of the coil 3 further through the inner peripheral side of the coil 3 and again to the outside of the brushless motor 316.
  • the frame 305 has an edge 16.
  • the edge 16 is located at the end of the side ventilation hole 315 on the upstream side with respect to the flow of the swirling airflow flowing through the frame 305.
  • the edge 16 has a sloped shape facing the outer peripheral side of the frame 305.
  • the swirling airflow flows from the side vent holes 315 to the inner peripheral side of the frame 305.
  • the swirling airflow flows along the shape of the frame 305.
  • the swirling airflow flows along the shape of the slope of the edge 16. For this reason, the airflow easily flows into the inner peripheral side of the frame 305. Thereby, the airflow which contacts the coil 3 increases and the cooling performance of the brushless motor 316 improves.
  • the frame 305 has an edge 17.
  • the edge 17 is positioned at the downstream end of the side ventilation hole 315 with respect to the flow of the swirling airflow flowing through the frame 305.
  • the edge 17 is bent and provided so as to protrude toward the outer peripheral side of the frame 305.
  • the swirling airflow is easily introduced from the side ventilation holes 315 to the inner peripheral side of the frame 305. For this reason, the airflow which contacts the coil 3 increases further, and the cooling performance of the brushless motor 316 improves.
  • the corner inside the fan case 11 facing the outer peripheral side of the air guide 10 shown in FIG. 1 may be a curved surface.
  • This curved surface may be provided so as to gradually change the airflow passing through the air guide 10. Thereby, the pressure loss of airflow can be reduced.
  • the electric blower 43 according to the present embodiment is characterized in that the outer cylinder 413 includes a sound absorbing material 418. Further, the side ventilation hole 415 is arranged so as to face the mountain portion which is the position of the mountain at the end portion of the coil 3 and has the longest vertical distance from the rotation axis. .
  • the same constituent elements as those described as the constituent elements of the electric blower are denoted by the same reference numerals, and the description thereof is omitted.
  • FIG. 10 is a partial cross-sectional view of an electric blower according to the fourth embodiment of the present invention.
  • the electric blower 43 includes an outer cylinder 413, a sound absorbing material 418, and a ventilation path 414.
  • the ventilation path 414 is provided between the outer cylinder 413 and the sound absorbing material 418 and the frame 405.
  • the outer cylinder 413 is connected to the fan case 11 and provided on the outer peripheral side of the frame 405.
  • the sound absorbing material 418 is connected to the inside of the outer cylinder 413.
  • the sound absorbing material 418 normally has sufficient rigidity to allow airflow to pass.
  • the airflow discharged from the impeller 9 is guided to the ventilation path 414 through the air guide 10.
  • a plurality of side ventilation holes 415 are provided on the outer peripheral surface of the frame 405.
  • a plurality of side ventilation holes 415 and end portions of the coil 3 are provided at positions overlapping in the vertical direction with respect to the longitudinal direction of the rotating shaft 21. That is, the side ventilation hole 415 is provided so that the end of the coil 3 on the outer peripheral surface of the frame 405 is exposed when viewed from the longitudinal direction of the rotating shaft 21.
  • the airflow that passes through the inside of the brushless motor 416 is discharged to the end face ventilation hole 430. Further, the airflow entering the brushless motor 416 is discharged to the end surface ventilation hole 430 from the side ventilation hole 415 provided at the position where the end of the coil 3 on the downstream side of the airflow flowing through the ventilation path 414 is exposed. . Therefore, the airflow can pass through the brushless motor 416 smoothly. Thereby, the pressure loss of an airflow becomes low and the opportunity for an airflow to touch the edge part of the coil 3 increases.
  • the end face ventilation hole 430 is provided at a position where at least the inner peripheral side of the end of the coil 3 of the stator is exposed when viewed from the direction of the rotating shaft 21.
  • the airflow entering from the side ventilation hole 415 where the end of the coil 3 on the side of the impeller 9 is exposed mainly flows to the end surface ventilation hole 430 on the end surface of the frame so as to get over the peak portion of the end of the coil 3. Ingredients are generated.
  • an airflow component that flows in from the side ventilation holes 415 located on the end face ventilation hole 430 side of the frame end face, crosses the mountain portion at the end of the coil 3 and flows to the end face ventilation holes 430 is also generated.
  • the ventilation path 414 includes a sound absorbing material 418, but ensures a dimension that allows a sufficient air flow.
  • the sound absorbing material 418 restricts the airflow so as to flow in a direction approaching the frame 405.
  • the sound absorbing material 418 increases the proportion of airflow along the frame 405.
  • the airflow discharged from the impeller 9 is discharged as a swirling airflow through the air guide 10 to the ventilation path 414. This swirl airflow causes the airflow to flow into the side vent holes 415 of the frame 405.
  • FIG. 11 is a cross-sectional view of a brushless motor according to the fourth embodiment of the present invention.
  • the side vent holes 415 provided in the frame 405 are arranged so as to face the mountain portion that is the position of the mountain at the end of the coil 3 that has the longest vertical distance from the rotation axis. ing.
  • stator core 4 has teeth 20 that protrude toward the inner peripheral side of the stator core 4.
  • the coil 3 is wound with a tooth 20.
  • the groove 19 is provided on the outer peripheral surface of the stator core 4.
  • the groove 19 is provided on an extension line in the radial direction passing through the center of the tooth 20.
  • the groove 19 is configured to communicate with the end faces on both sides of the stator core 4 in the longitudinal direction of the rotating shaft 21. A part of the airflow that enters the brushless motor 416 from the side ventilation holes 415 passes through the grooves 19 provided on the outer periphery of the stator core 4. Thereby, the cooling effect of the brushless motor 416 can be enhanced.
  • channel 19 demonstrated the example provided in the cylindrical stator core 4 so that it may become a V-groove shape.
  • the groove 19 has a size and a shape that does not cause a problem as a magnetic circuit of the stator core 4, and forms a passage that communicates with the frame 405 on both end faces of the stator core 4. If it is such, the same effect can be obtained with any shape.
  • the frame 405 may be provided with the edge 16 and the edge 17 described in the first embodiment. Thereby, since the airflow which contacts the coil 3 increases further, cooling performance improves.
  • the cooling efficiency of the brushless motor can be increased while suppressing an increase in air pressure loss.
  • the present invention is useful as household electrical appliances, industrial equipment, etc. using an electric blower.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

La présente invention a trait à une soufflante électrique (22) qui comprend : un moteur sans balai (116) ; un tuyau extérieur (13) ; des trous d'écoulement d'air de face latérale (15) ; une roue (9) qui est dotée d'ailettes ; un guidage d'air (10) ; un boîtier de ventilateur (11) ; et un cheminement de l'air (14). Les trous d'écoulement d'air de face latérale (15) et les extrémités de bobines (3) sont agencés à des positions auxquelles les trous d'écoulement d'air de face latérale (15) et les extrémités de bobines (3) sont situés dans la direction longitudinale de l'arbre rotatif (21) de manière à être verticalement superposés les uns sur les autres.
PCT/JP2012/001046 2011-03-25 2012-02-17 Soufflante électrique et nettoyeur électrique utilisant celle-ci Ceased WO2012132199A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2011067229A JP2012202282A (ja) 2011-03-25 2011-03-25 電動送風機およびそれを用いた電気掃除機
JP2011067232A JP2012202283A (ja) 2011-03-25 2011-03-25 電動送風機およびそれを用いた電気掃除機
JP2011-067229 2011-03-25
JP2011-067232 2011-03-25

Publications (1)

Publication Number Publication Date
WO2012132199A1 true WO2012132199A1 (fr) 2012-10-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3343043A1 (fr) * 2016-12-28 2018-07-04 Nidec Corporation Dispositif soufflant et aspirateur comprenant celui-ci
EP3613991A4 (fr) * 2017-04-19 2020-04-08 Mitsubishi Electric Corporation Soufflante électrique, aspirateur et sèche-mains
TWI789564B (zh) * 2019-12-04 2023-01-11 鼎朋企業股份有限公司 吸塵裝置的抽風馬達
WO2024115989A1 (fr) * 2022-11-29 2024-06-06 Dyson Technology Limited Moteur à aimant permanent sans balais

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11125198A (ja) * 1997-10-22 1999-05-11 Matsushita Electric Ind Co Ltd 電動送風機
JP2010209770A (ja) * 2009-03-10 2010-09-24 Mitsubishi Electric Corp 電動送風機及び電動掃除機

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11125198A (ja) * 1997-10-22 1999-05-11 Matsushita Electric Ind Co Ltd 電動送風機
JP2010209770A (ja) * 2009-03-10 2010-09-24 Mitsubishi Electric Corp 電動送風機及び電動掃除機

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3343043A1 (fr) * 2016-12-28 2018-07-04 Nidec Corporation Dispositif soufflant et aspirateur comprenant celui-ci
EP3613991A4 (fr) * 2017-04-19 2020-04-08 Mitsubishi Electric Corporation Soufflante électrique, aspirateur et sèche-mains
EP3865712A1 (fr) * 2017-04-19 2021-08-18 Mitsubishi Electric Corporation Ventilateur électrique à deux bouches d'aspiration avec refroidissement du moteur par de l'air prélevé en aval du ventilateur
US11700980B2 (en) 2017-04-19 2023-07-18 Mitsubishi Electric Corporation Electric blower, vacuum cleaner, and hand drying device
TWI789564B (zh) * 2019-12-04 2023-01-11 鼎朋企業股份有限公司 吸塵裝置的抽風馬達
WO2024115989A1 (fr) * 2022-11-29 2024-06-06 Dyson Technology Limited Moteur à aimant permanent sans balais

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