CN211573836U - DC brushless electric fan for dust collector - Google Patents
DC brushless electric fan for dust collector Download PDFInfo
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- CN211573836U CN211573836U CN202020153061.2U CN202020153061U CN211573836U CN 211573836 U CN211573836 U CN 211573836U CN 202020153061 U CN202020153061 U CN 202020153061U CN 211573836 U CN211573836 U CN 211573836U
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Abstract
The utility model discloses a brushless electric fan of direct current for dust catcher, include: a rotor assembly including a bearing assembly, a rotating shaft rotatably supported on the bearing portion; the movable impeller is fixedly assembled on the rotating shaft and comprises a front wheel disc, a rear wheel disc and a plurality of blades, the front wheel disc and the rear wheel disc are respectively provided with an inner surface, and the adjacent two blades, part of the inner surface of the front wheel disc and part of the inner surface of the rear wheel disc define an air flow channel with gradually enlarged sectional area from inside to outside; wherein the gas flow channel has an inlet end and an outlet end; the inner surface of the front wheel disc is arranged to be gradually close to the conical surface of the rear wheel disc from inside to outside, and the front-back height of the air flow channel at the inlet end is larger than the front-back height of the air flow channel at the outlet end. The inner surface of the front wheel disc is set to be a conical surface, so that each flow cross section in the impeller basically keeps stable in the radial direction, the vortex in a blade flow channel generated by overlarge change of the flow cross section is effectively eliminated, and the impeller efficiency is improved.
Description
Technical Field
The utility model relates to an electric fan technical field for the dust catcher, concretely relates to high-efficient electric fan of brushless direct current for dust catcher.
Background
Small household hand-held dust collectors are increasingly accepted by the market, the trend of miniaturization of electric fans is brought forward, low power, large suction power and high efficiency are basic performance requirements, and the existing brushless direct current electric fans cannot meet the trend or the requirements at the same time.
The existing brushless direct current electric fan has the disadvantages of complicated structure, more parts, difficult mold development, low electric fan assembly efficiency and high cost.
The brushless direct current fan has high rotating speed, and the service life of the bearing is the ceiling of the service life of the electric fan; in addition, the rotation speed is positively correlated with the noise, so that the rotation speed of the electric fan is reduced on the premise of ensuring that each aerodynamic performance parameter of the electric fan is not reduced, and the method is a new requirement for the direct current brushless motor.
Disclosure of Invention
In order to solve the technical problem, the utility model aims at providing a brushless direct current fan for dust catcher that the size is little, efficient and be convenient for produce.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: a brushless DC electric blower for a vacuum cleaner, comprising: the rotor assembly comprises a bearing assembly, a rotating shaft rotatably supported on the bearing assembly, and a rotor core fixedly arranged with the rotating shaft;
the movable impeller is fixedly assembled on the rotating shaft and comprises a front wheel disc, a rear wheel disc and a plurality of blades, wherein the middle part of the front wheel disc is provided with a suction port, the rear wheel disc is arranged opposite to the front wheel disc, the blades are arranged between the front wheel disc and the rear wheel disc, the front wheel disc and the rear wheel disc are respectively provided with an inner surface, the blades are sequentially arranged around the suction port at intervals along the circumferential direction, and the partial inner surfaces of the adjacent two blades and the front wheel disc and the partial inner surface of the rear wheel disc define an air flow channel with gradually enlarged sectional area from inside to outside; a stator assembly; an integrated circuit board; the wheel cover covers the movable impeller; wherein said gas flow channel has an inlet end and an outlet end; the inner surface of the front wheel disc is a conical surface gradually close to the rear wheel disc from inside to outside, and the front-back height of the airflow channel at the inlet end is larger than the front-back height of the airflow channel at the outlet end.
The inner surface of the front wheel disc is set to be a conical surface, so that each flow cross section in the impeller basically keeps stable in the radial direction, the vortex in a blade flow channel generated by overlarge change of the flow cross section is effectively eliminated, and the impeller efficiency is improved.
In the preferred scheme, the blades are fixed with the front wheel disc and the rear wheel disc in a riveting mode.
In the preferred scheme, electric fan include fore-stock and after-poppet, the preceding, the back tip of fore-stock respectively with the wheel casing and the after-poppet carries out the circumference cooperation fixed.
The front end and the rear end of the front support are respectively matched with the wheel cover and the rear support in the circumferential direction, so that the front support, the rear support and the wheel cover can jointly form an electric fan integral framework and an air flow channel.
In a further preferred scheme, the front support is provided with a plurality of stator blades which are uniformly distributed along the circumferential direction, each stator blade is of a three-dimensional curved surface structure, and the stator blades can diffuse the airflow flowing out from the outlet end of the airflow channel and then guide the airflow into the rear side of the front support.
In this further preferred scheme, stator blade adopts space ternary curved surface, when making things convenient for mould development, make full use of circumference space, effectively prolonged the diffusion segment length, promotes electric fan efficiency.
In a further preferred scheme, the front support comprises a front support shell positioned on the periphery and a front bearing chamber support frame positioned on the inner side of the front support shell, and a front bearing chamber is arranged in the middle of the front bearing chamber support frame; the rear support comprises an annular rear support shell positioned on the periphery and a rear bearing chamber support frame positioned on the inner side of the rear support shell, and a rear bearing chamber is arranged in the middle of the rear bearing chamber support frame; the bearing assembly has a portion that fits within the forward bearing chamber and the bearing assembly has a portion that fits within the rearward bearing chamber.
Further preferably, stator module include stator core and install winding on the stator core, be provided with a plurality of stator support columns on the rear end face of front bearing room support frame, be provided with a plurality of stator pressure platforms on the preceding terminal surface of rear bearing room support frame, stator core's preceding, rear end face respectively by stator support column on the fore-stock with stator pressure platform cooperation on the after-poppet is fixed.
Preferably, a support platform is arranged on the rear end face of the rear bearing chamber support frame, and the integrated circuit board is fixedly assembled on the support platform. Still further preferably, the electric fan further comprises a circuit board protective cover, a plurality of buckles are arranged at the rear end of the rear support shell, and the circuit board protective cover is assembled with the buckles to shield the integrated circuit board.
Preferably, the front end of the front support and the wheel cover are assembled by adopting gluing or ultrasonic welding and hot melting processes, and the rear end of the front support and the rear support are fixed through a plurality of threaded fasteners.
In a preferable scheme, an airtight ring is arranged at the joint of the wheel cover and the suction port of the front wheel disc. This setting of airtight circle can effectively restrain the gas that the movable vane wheel was thrown away and flow back again, promotes electric fan efficiency, reduces aerodynamic noise.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
Fig. 1 is an exploded view of an electric fan according to an embodiment of the present invention;
fig. 2 is an exploded view of the overall structure of the electric fan according to an embodiment of the present invention;
fig. 3 is a schematic view of a half-section of the overall structure of the electric fan according to an embodiment of the present invention;
fig. 4 is a schematic perspective view of a movable impeller according to an embodiment of the present invention;
fig. 5 is a schematic front view of a movable impeller according to an embodiment of the present invention;
fig. 6 is a front view semi-sectional view of a movable impeller according to an embodiment of the present invention;
fig. 7 is a schematic top half-sectional view of a movable impeller according to an embodiment of the present invention;
fig. 8 is a first perspective view of a front bracket according to an embodiment of the present invention;
fig. 9 is a second schematic perspective view of a front bracket according to an embodiment of the present invention;
fig. 10 is a first perspective view of a rear bracket according to an embodiment of the present invention;
fig. 11 is a second schematic perspective view of the rear bracket according to an embodiment of the present invention;
fig. 12 is a second perspective view of the rear bracket according to an embodiment of the present invention;
wherein: 100. an electric fan; 1. a wheel cover; 2. a movable impeller; 3. a front bracket; 4. a rotor assembly; 5. a stator assembly; 6. a rear bracket; 7. an integrated circuit board; 8. a circuit board shield; 11. a current collector; 41. a front bearing; 42. a rear bearing; 43. a rotating shaft; 44. a rotor core; 21. a suction port; 22. a front wheel disc; 23. a rear wheel disc; 24. a blade; 221. an inner surface; 231. an inner surface; 25. an air flow channel; 251. an inlet end; 252. an outlet end; 31. a stator blade; 32. a front carrier housing; 33. a front bearing housing support; 34. a front bearing chamber; 35. a stator support post; 36. tapping a threaded hole; 61. a rear bracket shell; 62. a rear bearing housing support; 621. a bearing housing support arm; 63. a rear bearing chamber; 64. a stator pressing table; 65. a countersink; 68. a through hole; 66. a support table; 67. buckling; 41. a front bearing; 42. a rear bearing; 43. a rotating shaft; 44. a rotor core; 91. a shaft bushing; 92. a spindle nose nut; 93. a gasket; 71. a limiting groove; 52. a sheet inserting groove; 53. and an insert terminal.
Detailed Description
For the purpose of illustrating the technical content, the constructional features, the achieved objects and the effects of the invention in detail, reference will be made to the following detailed description of the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1-1, a dc brushless electric fan 100 according to an embodiment of the present invention will be described, wherein the motor 100 can be used in a household cleaner or the like.
As shown in fig. 1 to 3, the electric blower 100 includes a wheel casing 1, a movable impeller 2, a front bracket 3, a rear bracket 6, an integrated circuit board 7 and a circuit board protective cover 8, which are sequentially arranged from front to back, and a rotor assembly 4 and a stator assembly 5 are jointly installed in the front bracket 3 and the rear bracket 6. The wheel casing 1 covers the movable impeller 2, the middle part of the wheel casing 1 is provided with a current collector 11, the current collector 11 adopts conical and circular arc transition, smoothness of airflow entering the movable impeller 2 can be improved, and a current collecting effect is improved. The rotor assembly 4 includes a front bearing 41, a rear bearing 42, a rotating shaft 43 rotatably supported on the front bearing 41 and the rear bearing 42, and a rotor core 44 fixedly provided with the rotating shaft 43. The rotor core 44 is made of a permanent magnet material and is bonded to the rotating shaft 43.
As shown in fig. 4-5, the movable impeller 2 includes a front disk 22 having a suction port 21 in the middle, a rear disk 23 disposed opposite to the front disk 22, and a plurality of blades 24 interposed between the front disk 22 and the rear disk 23. In this example, the blades 24 are fixed to the front disk 22 and the rear disk 23 by caulking. A plurality of blades 24 are circumferentially spaced around the suction port 21. Two adjacent blades 24 define an airflow channel 25 with gradually increasing cross-sectional area from inside to outside with a part of the inner surface 221 of the front disk 22 and a part of the inner surface 231 of the rear disk 23.
As shown in fig. 6, front disc 22 has an inner face 221 and rear disc 23 has an inner face 231. The whole front wheel disc 22 is set to be in a conical structure, the inner surface 221 of the front wheel disc 22 is set to be gradually close to the conical surface of the rear wheel disc 23 from inside to outside, and the inner surface of the rear wheel disc 23 is a horizontal plane.
As shown in fig. 7, the air flow passage 25 has an inlet end 251 and an outlet end 252, and the structure is such that the front-to-rear height (i.e., the axial direction along the axis of the rotating shaft) of the air flow passage 25 at the inlet end 251 is greater than the front-to-rear height of the air flow passage 25 at the outlet end 252. The conical front wheel disc 22 can basically keep each flow section in the movable impeller 2 stable in the radial direction, effectively eliminates the vortex in the flow channel 25 of the blade 24 caused by overlarge change of the flow section, and improves the efficiency of the movable impeller 2.
In this embodiment, an airtight ring (not shown) is disposed at the matching position of the wheel cover 1 and the suction port 21 of the movable impeller 2, and the airtight ring can effectively prevent the airflow thrown by the movable impeller 2 from flowing back from the suction port, thereby improving the efficiency of the electric fan and reducing the aerodynamic noise. The meridian surface shape design of wheel casing 1 cooperation movable vane wheel 2, save material, practice thrift the space, reduce the mould development degree of difficulty, the circular arc inner chamber of wheel casing 1 still with movable vane wheel 2 throw away the air current direction restraint for the axial, conveniently gets into next link.
As shown in fig. 8 to 9, the front carrier 3 includes a ring-shaped front carrier housing 32 at the periphery, a front bearing chamber support frame 33 inside the front carrier housing 32, and a stator blade 31 therebetween. The middle of the front bearing chamber support frame 33 is provided with a front bearing chamber 34. The front end part of the front bracket 3 is circumferentially matched and fixed with the wheel cover 3, and the matching and fixing mode can be assembled by adopting gluing or ultrasonic welding and hot melting technology. The rear end face of the front bearing chamber support frame 33 is provided with 3 stator support columns 35 extending towards the rear side, and each stator support column 35 is provided with a self-tapping threaded hole 36.
In this example, the front bracket 3 has 8 stator blades 31 uniformly distributed in the circumferential direction, the stator blades 31 play roles of guiding and diffusing airflow, and simultaneously, the front bearing chamber support frame 33 and the front bracket shell 32 are connected into a whole, and the structure is also a key link for ensuring the efficiency of the electric fan and the position of an efficiency working point. Stator blade 31 has a three-dimensional curved surface structure, and stator blade 31 can diffuse the airflow flowing out from outlet end 252 of airflow passage 25 and guide the airflow to the rear side of front bracket 4.
As shown in fig. 10-12, the rear bracket 6 includes an annular rear bracket shell 61 at the periphery and a rear bearing chamber support frame 62 at the inner side of the rear bracket shell 61, the rear bearing chamber support frame 62 adopts a structure of three bearing chamber support arms 621 uniformly distributed at an interval of 120 °, and a rear bearing chamber 63 is arranged in the middle of the rear bearing chamber support frame 62. The front end face of the rear bearing chamber support frame 62 is provided with 3 stator pressure tables 64. The rear bearing housing support frame 62 is provided with a counterbore 65 that extends through each stator pressure land 654. The rear bearing housing support frame 62 is integrally coupled to the rear support housing 61. The stator pressing table 64 functions to press-fit the stator core on the stator assembly 5 and also functions to reinforce the rear bearing housing support frame 62. The bearing housing support 62 is perforated with through holes 68 near the bearing housing 6.5 and near the rear housing shell face. The through holes 68 can reduce the temperature rise of the bearing, reduce part of pneumatic noise, save materials and reduce the shrinkage in the molding process of injection molding products.
A support table 66 is provided on the rear end surface of the rear bearing housing support frame 62, and 3 fasteners 67 are provided on the rear end portion of the rear support housing 61. The support table 66 circumferentially positions and axially supports the integrated circuit board 7, and the integrated circuit board 7 is fixedly mounted on the support table 66. The clips 67 respectively provide a mounting guide and an assembly working surface for the circuit board protective cover 8, and the circuit board protective cover 8 is assembled with the 3 clips 67 to shield the integrated circuit board 7.
In this example, the front bracket 3 is circumferentially fitted at its front and rear ends to the wheel housing 1 and the rear bracket 6, respectively, and together form an integral skeleton of the electric fan 100 and an airflow passage. Wherein, the front end of fore-stock 3 and wheel casing 3 carry out circumference cooperation fixed, and its cooperation fixed mode can adopt gluing or ultrasonic welding and hot melt technology equipment. The front bracket 4 and the rear bracket 5 are coupled and assembled by 3 screws using self-tapping screw holes 36 fitted in the stator support column 35 and the countersunk hole 65.
As further shown in fig. 1, 2 and 3, the rotor assembly 4 includes a front bearing 41, a rear bearing 42, a rotating shaft 43 rotatably supported on the front bearing 41 and the rear bearing 42, and a rotor core 44 fixedly disposed with the rotating shaft 43. The front bearing 41 is fitted in the front bearing chamber 34 of the front bearing chamber support frame 33, and the rear bearing 42 is fitted in the rear bearing chamber 63 in the middle of the rear bearing chamber support frame 62. This will achieve a stable support of the shaft 43 inside the electric fan 100. The movable impeller 2 is assembled on the rotating shaft 43 of the rotor assembly 4 through a shaft bushing 91, a spindle head nut 92 and a gasket 93.
As shown in fig. 6, the ic board 7 is provided with a limiting groove 71, and the limiting groove 71 and the supporting base 66 act to support the ic board 7 on the rear bearing housing supporting frame 62. The stator assembly 5 is provided with an insert terminal 53 extending from the insert groove 52, and the dust collecting circuit board 7 is soldered with the insert terminal 53, so that the integrated circuit board 7 is firmly installed, and the effective area of the integrated circuit board 7 is ensured.
In this example, the fuselage diameter is 45mm and the axial nominal dimension is 57.5 mm. The nominal diameter of the movable impeller 2 is 34mm, the number of the movable impeller 2 is 7, the inlet nominal height of the blades 24 is 8.84mm, and the outlet nominal height is 4.97 mm; the inlet angle of each blade 2 is 15-20 degrees, the axial length of the blade root of the stator blade 31 with the outlet angle of 20-25 degrees is 8.43mm, the axial length of the blade top is 9.38mm, the inlet angle of the blade root is 25-30 degrees, the inlet angle of the blade top is 20-25 degrees, the outlet angle of the blade root is 45-50 degrees, and the outlet angle of the blade top is 45-50 degrees; stator blade 31 is under the condition of making things convenient for mould development, and furthest utilizes the circumference space, has improved the diffuser section length, promotes electric fan efficiency. The height of the iron core 51 of the stator assembly 5 is 9mm, and the outer diameter is 28 mm. The core of the rotor component is made of permanent magnet materials and is bonded on the rotating shaft, and the height of the magnet is 9 mm.
The IEC60312 standard is adopted for experiments, and compared with movable impellers with the same outer diameter size which are widely applied in engineering practice, the movable impeller 2 in the embodiment is adopted to improve the efficiency of the electric fan by 1.2-1.9% under the working condition that the electric fan only replaces the movable impeller. The whole machine absorbs 53.1W of work in 13 holes under the working voltage of 108W of rated power and 10.8V, and the efficiency is 49 percent; the highest point of the performance curve of the high-efficiency energy-saving vacuum pump reaches 54.2W, and the maximum efficiency is 50.2%. The efficiency of the existing other brushless direct current fans is less than 45% under the same working condition, and the efficiency of the existing brushless direct current fans is lower.
Therefore, the present case is through from electric fan overall structure, high-efficient movable vane wheel, stator blade, three main aspects are started, have researched and developed: the brushless direct current electric fan has the advantages of simple, compact and attractive structure, strong acting capacity of the movable impeller, high efficiency, low rotating speed, high utilization rate of circumferential space of the stator blade, long effective diffusion length, good diffusion effect, simple and convenient mold development and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A brushless DC electric blower for a vacuum cleaner, comprising:
a rotor assembly including a bearing assembly, a rotating shaft rotatably supported on the bearing assembly, and a rotor core fixedly disposed with the rotating shaft;
a stator assembly;
the movable impeller is fixedly assembled on the rotating shaft and comprises a front wheel disc, a rear wheel disc and a plurality of blades, wherein the middle part of the front wheel disc is provided with a suction port, the rear wheel disc is arranged opposite to the front wheel disc, the blades are arranged between the front wheel disc and the rear wheel disc at intervals in sequence around the suction port along the circumferential direction, the front wheel disc and the rear wheel disc are both provided with inner surfaces, and the inner surfaces of the front wheel disc and the rear wheel disc of two adjacent blades and the inner surfaces of the rear wheel disc define an air flow channel with gradually enlarged sectional area from inside to outside;
an integrated circuit board;
the wheel cover covers the movable impeller;
the air flow channel is characterized in that the air flow channel is provided with an inlet end positioned at the inner side and an outlet end positioned at the outer side; the inner surface of the front wheel disc is a conical surface gradually close to the rear wheel disc from inside to outside, and the front-back height of the airflow channel at the inlet end is larger than the front-back height of the airflow channel at the outlet end.
2. The brushless DC electric blower of claim 1, wherein the blades are fixed to the front and rear wheel discs by riveting.
3. The brushless dc electric blower for vacuum cleaner as claimed in claim 1, further comprising a front bracket and a rear bracket, wherein front and rear ends of the front bracket are circumferentially fitted and fixed to the wheel housing and the rear bracket, respectively.
4. The brushless DC electric blower of claim 3, wherein the front bracket has a plurality of stator blades uniformly distributed along the circumferential direction, the stator blades have a three-dimensional curved surface structure, and the stator blades can diffuse the airflow flowing out from the outlet end of the airflow channel and guide the airflow to the rear side of the front bracket.
5. The brushless DC electric fan as recited in claim 3, wherein said front bracket comprises a front bracket housing at the periphery and a front bearing chamber support frame at the inner side of said front bracket housing, a front bearing chamber is provided at the middle of said front bearing chamber support frame; the rear support comprises an annular rear support shell positioned on the periphery and a rear bearing chamber support frame positioned on the inner side of the rear support shell, and a rear bearing chamber is arranged in the middle of the rear bearing chamber support frame; the bearing assembly has a portion that fits within the forward bearing chamber and the bearing assembly has a portion that fits within the rearward bearing chamber.
6. The brushless DC electric fan as recited in claim 5, wherein said stator assembly comprises a stator core and a winding mounted on said stator core, said front bearing chamber supporting frame has a plurality of stator supporting columns on its rear end face, said rear bearing chamber supporting frame has a plurality of stator pressing platforms on its front end face, and said stator core has its front and rear end faces fixed by said front supporting column and said rear supporting frame respectively.
7. The brushless DC electric fan as claimed in claim 5, wherein a support base is disposed on a rear end surface of the rear bearing housing support, and the IC board is fixedly mounted on the support base.
8. The brushless dc electric blower of claim 7, further comprising a circuit board shield, wherein the rear end of the rear bracket housing has a plurality of clips, and the circuit board shield is assembled with the clips to shield the ic board.
9. The brushless DC electric fan of claim 3, wherein the front end of the front bracket is assembled with the wheel housing by gluing or ultrasonic welding and hot melting, and the rear end of the front bracket is fixed with the rear bracket by a plurality of threaded fasteners.
10. The brushless DC electric blower of claim 3, wherein an airtight ring is provided at the junction of the wheel cover and the suction port of the front wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020153061.2U CN211573836U (en) | 2020-02-05 | 2020-02-05 | DC brushless electric fan for dust collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020153061.2U CN211573836U (en) | 2020-02-05 | 2020-02-05 | DC brushless electric fan for dust collector |
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| Publication Number | Publication Date |
|---|---|
| CN211573836U true CN211573836U (en) | 2020-09-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020153061.2U Active CN211573836U (en) | 2020-02-05 | 2020-02-05 | DC brushless electric fan for dust collector |
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| CN (1) | CN211573836U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027795A (en) * | 2021-04-27 | 2021-06-25 | 广东威灵电机制造有限公司 | Fan and cleaning equipment |
| CN115733327A (en) * | 2022-12-21 | 2023-03-03 | 湖南国梦科技有限公司 | High-rotating-speed brushless dust collector motor |
-
2020
- 2020-02-05 CN CN202020153061.2U patent/CN211573836U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027795A (en) * | 2021-04-27 | 2021-06-25 | 广东威灵电机制造有限公司 | Fan and cleaning equipment |
| CN113027795B (en) * | 2021-04-27 | 2023-03-10 | 广东威灵电机制造有限公司 | Fan and cleaning equipment |
| CN115733327A (en) * | 2022-12-21 | 2023-03-03 | 湖南国梦科技有限公司 | High-rotating-speed brushless dust collector motor |
| CN115733327B (en) * | 2022-12-21 | 2023-09-12 | 湖南国梦科技有限公司 | High-rotation-speed brushless dust collector motor |
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