CN210898751U - Rotor shell structure, outer rotor motor and washing machine with same - Google Patents
Rotor shell structure, outer rotor motor and washing machine with same Download PDFInfo
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- CN210898751U CN210898751U CN201921626863.4U CN201921626863U CN210898751U CN 210898751 U CN210898751 U CN 210898751U CN 201921626863 U CN201921626863 U CN 201921626863U CN 210898751 U CN210898751 U CN 210898751U
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Abstract
The application provides a rotor housing structure, external rotor electric machine and have its washing machine includes: the heat dissipation structure comprises a plurality of twisted fan-blade-shaped air deflectors which are circumferentially arranged around the outer wall of the shaft hole; the included angle between the top of the twisted fan-shaped air deflector and the cross section is a first included angle a, and the included angle between the root of the twisted fan-shaped air deflector and the cross section is a second included angle b; the first included angle a is smaller than the second included angle b; the twisted fan blade-shaped air deflector is used for balancing the wind pressure borne by the surface of the rotor shell. According to the rotor shell structure, the outer rotor motor and the washing machine with the same, the twisted fan blade-shaped air deflector can balance the air pressure borne by the surface of the rotor shell, reduce airflow vortexes generated due to unequal air pressure, reduce the pressure pulsation of the surface of the rotor shell, and reduce the pneumatic noise of the motor.
Description
Technical Field
The application belongs to the technical field of washing machines, and particularly relates to a rotor shell structure, an outer rotor motor and a washing machine with the same.
Background
At present, with the development of science and technology and the improvement of the living standard of people, the washing machine is more and more popularized in the life of people; the direct-drive external rotor motor is applied to more and more washing machines due to the characteristics of energy conservation and high efficiency.
However, the direct-drive external rotor motor, due to its unique motor structure, may stir the air around the motor in a large range when the motor is running, resulting in large aerodynamic noise. And the heat radiation structure of washing machine direct drive formula external rotor electric machine rotor shell among the prior art is mostly the mode at rotor shell surface trompil, this kind of air inlet mode causes rotor shell surface to receive the wind pressure unbalance easily, the pressure oscillation that arouses the air produces great pneumatic noise, and the air intake among the prior art is always directly over stator winding, the air can directly produce the impact to the inside stator winding of motor, lead to stator winding vibration aggravation and produce great motor noise.
Therefore, how to provide a method for balancing the wind pressure on the surface of the rotor shell effectively, thereby reducing the airflow vortex generated by unequal wind pressure, reducing the pressure pulsation on the surface of the rotor shell and reducing the aerodynamic noise of the motor.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem that this application will be solved lies in providing a rotor housing structure, external rotor electric machine and have its washing machine, can effectual balanced rotor shell surface receive the wind pressure to reduce because of the unequal air current swirl that produces of wind pressure, reduce the pressure pulsation on rotor case surface, reduce the pneumatic noise of motor.
In order to solve the above problem, the present application provides a rotor case structure including: the heat dissipation structure comprises a plurality of twisted fan-blade-shaped air deflectors which are circumferentially arranged around the outer wall of the shaft hole; the included angle between the top of the twisted fan-shaped air deflector and the cross section is a first included angle a, and the included angle between the root of the twisted fan-shaped air deflector and the cross section is a second included angle b; the first included angle a is smaller than the second included angle b; the twisted fan blade-shaped air deflector is used for balancing the wind pressure borne by the surface of the rotor shell.
Preferably, the heat dissipation structure further comprises an axial air inlet and a circumferential air outlet, and the axial air inlet and the circumferential air outlet are arranged between two adjacent twisted fan blade-shaped air deflectors.
Preferably, the first included angle a is 5-25 degrees; the second included angle b is 30-65 degrees.
Preferably, the end wall of the shell also comprises a fixed part; the fixing part, the heat dissipation structure and the outer wall of the shaft hole are sequentially connected from the edge of the end wall of the shell to the center; the top of the twisted fan blade-shaped air deflector is connected with the fixed part, and the root of the twisted fan blade-shaped air deflector is connected with the outer wall of the shaft hole.
Preferably, the number of the twisted fan blade-shaped air deflectors is an odd number greater than 1.
Preferably, the heat dissipation structure further comprises a circumferential reinforcing rib; the circumferential reinforcing ribs are connected with all the twisted fan blade-shaped air deflectors.
Preferably, the circumferential reinforcing rib penetrates through the twisted fan blade air guide plate in the thickness direction of the twisted fan blade air guide plate.
Preferably, the circumferential reinforcing rib forms a first annular bulge on the inner surface of the twisted fan blade-shaped air deflector, and forms a second annular bulge on the outer surface of the twisted fan blade-shaped air deflector.
Preferably, the thickness of the first annular bulge and the thickness of the second annular bulge are both 2 mm-5 mm.
Preferably, the width of the twisted fan blade air deflector is not uniformly increased from the root to the top.
Preferably, the securing portion is obliquely disposed relative to the cross-section in a direction away from the thermal structure.
Preferably, the diversion direction of the twisted fan blade-shaped air deflector is positively correlated with the rotation direction of the motor when the outer rotor motor of the washing machine dehydrates.
According to still another aspect of the present application, an outer rotor motor is provided, which includes a rotor housing structure as described above.
According to still another aspect of the present application, there is provided a washing machine including the outer rotor motor described above.
The end wall of the shell of the rotor shell structure is provided with a heat dissipation structure, and the heat dissipation structure comprises a plurality of twisted fan-blade-shaped air deflectors which are circumferentially arranged around the outer wall of the shaft hole; the twisted fan blade-shaped air deflector can balance the air pressure borne by the surface of the rotor shell, reduce airflow vortexes generated by unequal air pressure, reduce the pressure pulsation of the surface of the rotor shell and reduce the pneumatic noise of a motor; moreover, the twisted fan blade-shaped air deflector can also strengthen the structural strength of the rotor shell, improve the rigidity, avoid noise caused by resonance, ensure consistent air gaps between the stator and the rotor under the working condition of high rotating speed of the motor and reduce electromagnetic noise.
Drawings
Fig. 1 is a schematic structural diagram of a rotor housing structure according to an embodiment of the present application;
fig. 2 is a schematic view of a connection structure of the twisted fan blade air deflector and the connection shaft according to the embodiment of the present application;
FIG. 3 is a schematic view of a connection structure of a twisted fan blade air deflector on an end wall of a casing according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of the intake of air to the rotor housing structure of an embodiment of the present application;
fig. 5 is an air outlet schematic view of a rotor housing structure according to an embodiment of the present application;
fig. 6 is a sectional view of a rotor case according to an embodiment of the present application.
The reference numerals are represented as:
1. a housing end wall; 2. the outer wall of the shaft hole; 3. a heat dissipation structure; 31. a sheet twisted fan blade-shaped air deflector; 41. An axial air inlet; 42. a circumferential air outlet; 5. a fixed portion; 6. and (5) circumferential reinforcing ribs.
Detailed Description
Referring collectively to fig. 1-3, a rotor housing structure according to an embodiment of the present application includes: the heat dissipation structure comprises a shell end wall 1, wherein a heat dissipation structure 3 and a shaft hole are arranged on the shell end wall 1, a shaft hole outer wall 2 is arranged in the shaft hole, and the heat dissipation structure 3 comprises a plurality of twisted fan-blade-shaped air deflectors 31 which are circumferentially arranged around the shaft hole outer wall 2; the included angle between the top of the twisted fan-shaped air deflector 31 and the cross section is a first included angle a, and the included angle between the root of the twisted fan-shaped air deflector 31 and the cross section is a second included angle b; the first included angle a is smaller than the second included angle b; the twisted fan blade-shaped air deflector 31 is used for balancing the wind pressure on the surface of the rotor shell. The wind pressure generated by the circumferential velocity at the blade top is large and the wind pressure generated by the circumferential velocity at the blade root is small in the working process of the motor, the twisted fan blade-shaped wind deflector 31 is adopted in the technical scheme, the first included angle a is smaller than the second included angle b, and the twisted angle at the blade root is larger than the twisted angle at the blade top, so that the wind pressure borne by the surface of a rotor shell can be balanced, airflow vortexes generated by unequal wind pressures are reduced, the pressure pulsation on the surface of the rotor shell is reduced, and the pneumatic noise of the motor is reduced; moreover, the twisted fan blade-shaped air deflector 31 can also strengthen the structural strength of the rotor shell, improve the rigidity, avoid noise caused by resonance, ensure consistent air gaps between the stator and the rotor under the working condition of high rotating speed of the motor and reduce electromagnetic noise.
Referring to fig. 4-5 in combination, the present application also discloses some embodiments, the heat dissipation structure 3 further includes an axial air inlet 41 and a circumferential air outlet 42, and the axial air inlet 41 and the circumferential air outlet 42 are disposed between two adjacent twisted fan-blade air deflectors 31. The arrow direction in fig. 3 represents the axial air inlet direction, the arrow direction in fig. 4 represents the circumferential air outlet direction, and the axial air inlet 41 and the circumferential air outlet 42 can avoid the impact of the incoming air flow directly on the stator winding, reduce the air vortex generated in the stator winding, and reduce the vortex noise.
Furthermore, the twisted fan blade-shaped air deflector 31 is sheet-shaped, so that air can be cut in the rotating process of the motor, air noise is reduced, the overall weight of the rotor is reduced, energy loss in the rotating process of the rotor is reduced, and the efficiency of the motor is improved.
Referring to fig. 5 in combination, the present application also discloses embodiments wherein the first included angle a is 5 to 25 °; the second included angle b is 30-65 degrees.
Further, the first included angle a is 10-20 degrees; the second included angle b is 45 degrees to 65 degrees, the air pressure of the end face of the rotor shell can be well balanced in the setting range of the included angle, the generation of eddy currents is reduced, and the pneumatic noise is reduced.
Further, the housing end wall 1 also includes a fixing portion 5; the fixing part 5, the heat dissipation structure 3 and the shaft hole outer wall 2 are sequentially connected from the edge of the end wall 1 of the shell to the center; the top of the twisted fan blade-shaped air deflector 31 in the length direction is connected with the fixed part 5, and the root is connected with the shaft hole outer wall 2.
Further, the axial and radial distances between adjacent twisted fan blade air deflectors 31 are the same.
Further, the plurality of twisted fan-blade-shaped air deflectors 31 circumferentially arranged around the shaft hole outer wall 2 are arranged at equal intervals, so that the ventilation volume of each axial air inlet 41 and each circumferential air outlet 42 is uniform, heat dissipation can be better achieved, and the twisted fan-blade-shaped air deflectors 31 are prevented from vibrating.
Further, the number of the twisted fan-blade air deflectors 31 is an odd number larger than 1, so that the problem of resonance of the twisted fan-blade air deflectors 31, which may be caused by designing the number of the twisted fan-blade air deflectors 31 to be an even number, can be avoided.
Further, the heat dissipation structure 3 further includes a circumferential reinforcing rib 6; the circumferential reinforcing ribs 6 are connected with all the twisted fan blade-shaped air deflectors 31, so that the structural strength of the rotor shell can be effectively enhanced.
Further, the circumferential reinforcing rib 6 is integrally connected with the twisted fan blade air guide plate 31, so that vibration of the twisted fan blade air guide plate 31 can be reduced.
Further, the circumferential reinforcing rib 6 penetrates the twisted fan blade air guide plate 31 in the thickness direction of the twisted fan blade air guide plate 31, and the circumferential reinforcing rib 6 forms a first annular protrusion on the inner surface of the twisted fan blade air guide plate 31 and a second annular protrusion on the outer surface of the twisted fan blade air guide plate 31.
Further, the thickness of the first annular bulge is 2 mm-5 mm.
Further, the thickness of the second annular bulge is 2 mm-5 mm.
Furthermore, the circumferential reinforcing ribs 6 are annular reinforcing ribs, the diameter of each annular reinforcing rib is 1/3-1/4 of the diameter of the outer end face of the rotor shell, and the structural strength of the rotor shell can be well enhanced.
Furthermore, the thickness of the twisted fan blade-shaped air deflector 31 is 2 mm-4 mm, so that the twisted fan blade-shaped air deflector has a good air cutting effect under the condition of ensuring the strength of the rotor shell, further reduces air noise, and reduces the whole weight of the rotor.
Further, the width of the twisted fan blade air guide plate 31 is not uniformly increased from the root to the tip.
Referring to fig. 6 in combination, the present application also discloses embodiments in which the fixing portion 5 is disposed obliquely with respect to the cross section in a direction away from the heat dissipation structure 3.
Furthermore, the included angle e between the fixed part 5 and the cross section is 3-8 degrees, the angle range is obtained through fluid simulation, and the pneumatic noise can be well reduced.
Furthermore, the twisted fan-blade-shaped air deflector 31 and the fixed part 5 are integrally processed, so that the connection strength between the twisted fan-blade-shaped air deflector and the fixed part can be enhanced, the vibration of the twisted fan-blade-shaped air deflector 31 is reduced, and the noise is reduced.
Furthermore, the twisted fan blade-shaped air deflector 31 is connected with the outer wall 2 of the shaft hole in a fillet mode, stress borne by the part when the motor runs at a high speed is dispersed by the aid of the technical scheme, strength of the rotor shell is further enhanced, and structural strength of the twisted fan blade-shaped air deflector 31 is guaranteed.
Furthermore, two sides of the twisted fan blade-shaped air deflector 31 are in a tidal shape or a wave shape, and when airflow flows through the surface of the rotor shell of the motor, the airflow is split, so that the problem of small air pressure flowing through the surface of the rotor shell is solved, the attachment area of a turbulent flow boundary layer on the surface of the rotor shell is reduced, pressure pulsation is reduced, and aerodynamic noise is reduced.
Further, the rotor shell is integrally machined and manufactured by metal.
Furthermore, the rotor shell is integrally made of plastics, so that the overall structural strength of the rotor shell can be enhanced, the vibration of the twisted fan blade-shaped air deflector 31 is reduced, and the noise is reduced.
Furthermore, the flow guiding direction of the twisted fan-blade-shaped air deflector 31 is positively correlated with the motor rotating direction during the outer rotor motor dehydration of the washing machine, that is, the flow guiding direction of the twisted fan-blade-shaped air deflector 31 is the air entering from the outside to the inside of the rotor shell during the motor dehydration rotation, so that the air inlet amount can be increased, and the heat dissipation can be accelerated.
According to an embodiment of the application, an outer rotor motor comprises a rotor shell structure, and the rotor shell structure is the rotor shell structure.
According to an embodiment of the application, the washing machine comprises an outer rotor motor, and the rotor shell structure is the outer rotor motor.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (14)
1. A rotor housing structure, comprising: the heat dissipation structure comprises a shell end wall (1), wherein a heat dissipation structure (3) and a shaft hole are arranged on the shell end wall (1), a shaft hole outer wall (2) is arranged in the shaft hole, and the heat dissipation structure (3) comprises a plurality of twisted fan-blade-shaped air deflectors (31) which are circumferentially arranged around the shaft hole outer wall (2); the included angle between the top of the twisted fan-shaped air deflector (31) and the cross section is a first included angle a, and the included angle between the root of the twisted fan-shaped air deflector (31) and the cross section is a second included angle b; the first included angle a is smaller than the second included angle b; the twisted fan blade-shaped air deflector (31) is used for balancing the wind pressure borne by the surface of the rotor shell.
2. The rotor housing structure according to claim 1, wherein the heat dissipation structure (3) further comprises an axial air inlet (41) and a circumferential air outlet (42), and the axial air inlet (41) and the circumferential air outlet (42) are disposed between two adjacent twisted fan-shaped air deflectors (31).
3. The rotor housing structure of claim 1, wherein the first included angle a is 5 ° to 25 °; the second included angle b is 30-65 degrees.
4. The rotor housing structure according to claim 1, characterized in that the housing end wall (1) further comprises a fixing portion (5); the fixing part (5), the heat dissipation structure (3) and the shaft hole outer wall (2) are sequentially connected from the edge of the end wall (1) of the shell to the center; the top of the twisted fan blade-shaped air deflector (31) is connected with the fixed part (5), and the root of the twisted fan blade-shaped air deflector is connected with the outer wall (2) of the shaft hole.
5. The rotor housing structure according to claim 1, characterized in that the number of twisted fan blade air deflectors (31) is an odd number greater than 1.
6. The rotor housing structure according to claim 1, characterized in that the heat dissipating structure (3) further comprises a circumferential reinforcement rib (6); the circumferential reinforcing ribs (6) are connected with all the twisted fan blade-shaped air deflectors (31).
7. The rotor housing structure according to claim 6, wherein the circumferential reinforcing rib (6) penetrates the twisted fan blade air guide plate (31) in a thickness direction of the twisted fan blade air guide plate (31).
8. The rotor casing structure according to claim 7, wherein the circumferential reinforcing rib (6) forms a first annular protrusion on an inner surface of the twisted fan blade air guide plate (31) and a second annular protrusion on an outer surface of the twisted fan blade air guide plate (31).
9. The rotor housing structure of claim 8, wherein the first annular protrusion and the second annular protrusion each have a thickness of 2mm to 5 mm.
10. The rotor housing structure according to claim 1, wherein the width of the twisted fan blade air guide plate (31) is unevenly increased from the root portion to the tip portion.
11. A rotor housing structure according to claim 4, characterised in that the fixing portion (5) is arranged obliquely with respect to the cross-section in a direction away from the heat dissipation structure (3).
12. The rotor housing structure according to claim 1, wherein the flow guiding direction of the twisted fan blade air deflector (31) is positively correlated to the motor rotation direction when the outer rotor motor of the washing machine is spinning.
13. An external rotor electric machine comprising a rotor housing structure, characterized in that the rotor housing structure is a rotor housing structure according to any one of claims 1 to 12.
14. A washing machine comprising an outer rotor motor, wherein the outer rotor motor is the outer rotor motor according to claim 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921626863.4U CN210898751U (en) | 2019-09-27 | 2019-09-27 | Rotor shell structure, outer rotor motor and washing machine with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921626863.4U CN210898751U (en) | 2019-09-27 | 2019-09-27 | Rotor shell structure, outer rotor motor and washing machine with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210898751U true CN210898751U (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921626863.4U Active CN210898751U (en) | 2019-09-27 | 2019-09-27 | Rotor shell structure, outer rotor motor and washing machine with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210898751U (en) |
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2019
- 2019-09-27 CN CN201921626863.4U patent/CN210898751U/en active Active
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