CN210780344U

CN210780344U - Rotor shell structure, outer rotor motor and washing machine with same

Info

Publication number: CN210780344U
Application number: CN201921627653.7U
Authority: CN
Inventors: 谷欢欢; 郭莉娟; 许金鑫; 张荣婷; 滕佳宾; 王竞杰; 宋云逸; 夏制; 刘一波; 张冬冬
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-06-16
Anticipated expiration: 2029-09-27

Abstract

The application provides a rotor housing structure, external rotor electric machine and have its washing machine includes: a housing end wall; the end wall of the shell comprises a heat dissipation part and a shaft hole, and the shaft hole is internally provided with a shaft hole outer wall; the heat dissipation part is arranged around the outer wall of the shaft hole in the circumferential direction, and the distance between any point of the heat dissipation part and the central axis of the shaft hole is smaller than the radius of the stator insulation framework; the heat dissipation part comprises a first heat dissipation area and a second heat dissipation area which are sequentially arranged towards the direction close to the center; a first ventilation opening is formed in the first heat dissipation area; and a second ventilation opening is formed in the second heat dissipation area. According to the rotor shell structure, the outer rotor motor and the washing machine with the same, the second ventilation opening is more favorable for increasing the air inlet flow, and the broadband fluid noise can be reduced; the first vent may direct fluid flow to reduce discrete peak noise induced by the fluid passing through the stator slots. And meanwhile, the first ventilation opening and the second ventilation opening are adopted, so that the fluid noise can be effectively reduced.

Description

Rotor shell structure, outer rotor motor and washing machine with same

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, in a direct-drive drum washing machine, an outer rotor type direct-drive motor in which a motor rotor is disposed at the periphery of a stator is generally adopted, and a heat dissipation part of the direct-drive outer rotor motor is generally designed with an air guide structure on a rotor end cover, and the stator and the rotor are cooled by using the air guide structure.

However, the heat radiating portion easily causes severe fluid noise, which results in a large noise of the motor.

Therefore, how to provide a rotor case structure capable of effectively reducing fluid noise, an outer rotor motor and a washing machine having the same become problems to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present invention is to provide a rotor housing structure, an outer rotor motor and a washing machine having the same, which can effectively reduce fluid noise.

In order to solve the above problem, the present application provides a rotor case structure including: a housing end wall; the end wall of the shell comprises a heat dissipation part and a shaft hole, and the shaft hole is internally provided with a shaft hole outer wall; the heat dissipation part is arranged around the outer wall of the shaft hole in the circumferential direction, and the distance between any point on the heat dissipation part and the central axis of the shaft hole is smaller than the radius of the stator insulation framework; the heat dissipation part comprises a first heat dissipation area and a second heat dissipation area which are sequentially arranged towards the direction close to the center; a first ventilation opening is formed in the first heat dissipation area; and a second ventilation opening is formed in the second heat dissipation area.

Preferably, the first ventilation openings and the second ventilation openings are arranged in a staggered mode along the circumferential direction.

Preferably, the first heat dissipation area further comprises air deflectors arranged circumferentially, and the first ventilation opening is arranged between two adjacent air deflectors.

Preferably, the air deflector is fan-shaped.

Preferably, the housing end wall further comprises a fixing portion; the fixing part, the first heat dissipation area, the second heat dissipation area and the shaft hole are sequentially arranged from the edge of the end wall to the center; the outer periphery side of the first heat dissipation area is connected with the fixed part, and the inner periphery side of the first heat dissipation area is connected with the second heat dissipation area; the peripheral side of the second heat dissipation area is connected with the first heat dissipation area, and the inner peripheral side of the second heat dissipation area is connected with the outer wall of the shaft hole.

Preferably, the heat dissipation part further includes a first circumferential reinforcing rib; the first circumferential reinforcing rib is arranged on the outer circumferential side of the first heat dissipation area.

Preferably, the heat dissipation portion further includes a second circumferential bead disposed between the first and second heat dissipation regions.

Preferably, the heat dissipation portion further includes a third circumferential bead provided on an inner circumferential side of the second heat dissipation region.

Preferably, the second heat dissipation area further comprises radial reinforcing ribs thereon.

Preferably, the inner surface of the radially stiffener housing end wall forms a first radial projection; a second radial projection is formed on the outer surface of the end wall of the housing.

Preferably, the number of the first vents is an odd number greater than 1.

Preferably, the number of the second ventilation openings is an odd number greater than 1.

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.

A housing end wall of a rotor housing structure provided herein; the end wall of the shell comprises a heat dissipation part and a shaft hole, and the shaft hole is internally provided with a shaft hole outer wall; the heat dissipation part is arranged around the circumference of the outer wall of the shaft hole, and the position of the heat dissipation part is closer to the outer wall of the shaft hole than the position of the stator insulation framework; the heat dissipation part comprises a first heat dissipation area and a second heat dissipation area which are sequentially arranged towards the center direction; a first ventilation opening is formed in the first heat dissipation area; and a second ventilation opening is formed in the second heat dissipation area. The second ventilation opening is more favorable for increasing the air inlet flow and reducing the broadband fluid noise; the first vent may direct fluid flow to reduce discrete peak noise induced by the fluid passing through the stator slots. And the first ventilation opening and the second ventilation opening are adopted simultaneously, so that the fluid noise can be reduced by about 11 dB.

Drawings

FIG. 1 is a schematic view of an inner surface structure of a rotor case structure according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a motor according to an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of the present application taken in the area C of FIG. 1;

FIG. 4 is a schematic view of an outer surface structure of a rotor case according to an embodiment of the present application;

FIG. 5 is a schematic view of an outer surface configuration of a prior art rotor housing;

FIG. 6 is a comparison graph of noise reduction effect frequency spectra of the rotor housing of the embodiment of the present application and the rotor housing structure of the prior art.

The reference numerals are represented as:

1. a housing end wall; 2. a heat dissipating portion; 21. a first heat dissipation area; 211. a first vent; 212. an air deflector; 22. a second heat dissipation area; 221. a second vent; 3. a fixed portion; 31. a first circumferential stiffener; 4. the outer wall of the shaft hole; 51. a first radial projection; 52. a second radial projection; 6. a stator positioning hole; 7. a stator; 8. a stator insulation framework; 9. air intake of the prior art.

Detailed Description

Referring collectively to fig. 1-2, according to an embodiment of the present application, a rotor housing structure includes: a housing end wall 1; the end wall 1 of the shell comprises a heat dissipation part 2 and a shaft hole, and a shaft hole outer wall 4 is arranged in the shaft hole; the heat dissipation part 2 is circumferentially arranged around the outer wall 4 of the shaft hole, and the distance between any point on the heat dissipation part 2 and the central axis of the shaft hole is smaller than the radius of the stator insulation framework 8; the heat radiating portion 2 includes a first heat radiating area 21 and a second heat radiating area 22 which are sequentially arranged toward the center direction; the first heat dissipation area 21 is provided with a first vent 211; the second heat dissipation area 22 is provided with a second ventilation opening 221. In the above technical solution, the second ventilation opening 221 can effectively increase the flow rate to cool the motor and reduce the broadband fluid noise; the first vent 211 is more conducive to directing the flow of fluid to reduce the discrete peak noise induced by the fluid passing through the stator slots. The simultaneous use of the first vent 211 and the second vent 221 may reduce the fluid noise by about 11 dB. When the motor is operated, air flow enters from the first ventilation opening 211 and the second ventilation opening 221, wherein the air flow entering from the second ventilation opening 221 flows outwards along the radial direction; meanwhile, a part of the air flow enters air through the first ventilation opening 211; another portion of the airflow is directed outwardly from the first ventilation opening 211 and also out through the first ventilation opening 211.

Referring to fig. 3 in combination, the present application also discloses some embodiments, the first ventilation openings 211 and the second ventilation openings 221 are arranged in a staggered manner along the circumferential direction, that is, an included angle exists between a connecting line of the two ventilation openings and the central point of the end wall 1 of the housing, the structure is easier to guide, so that when an airflow flowing from inside to outside breaks away from the inner ring and reaches the outer ring, the airflow resistance loss is smaller, and thus the noise of the regeneration airflow is reduced.

Furthermore, the size of the included angle between the connecting lines of the two air vents and the central point of the end wall 1 of the shell body is different from the optimal angle value under different rotating speeds of the motor, so that the included angle can be designed aiming at a certain rotating speed, and the noise of the regenerated airflow can be reduced more effectively.

Further, the first heat dissipation area 21 further includes air deflectors 212 arranged circumferentially, and the first ventilation opening 211 is arranged between two adjacent air deflectors 212.

Further, the shape of the air deflector 212 is a sector, and the sector structure can also effectively improve the rigidity of the rotor, so that the radiation noise related to the modal frequency of the rotor caused by the vibration deformation of the rotor is small, the frequency is relatively high, and the radiation noise caused by the vibration deformation of the rotor can be effectively reduced.

Further, the housing end wall 1 also comprises a fixing portion 3; the fixing part 3, the first heat dissipation area 21, the second heat dissipation area 22 and the shaft hole are sequentially arranged from the edge of the end wall to the center; the outer peripheral side of the first heat dissipation area 21 is connected to the fixed portion 3, and the inner peripheral side is connected to the second heat dissipation area 22; the outer peripheral side of the second heat dissipation region 22 is connected to the first heat dissipation region 21, and the inner peripheral side is connected to the shaft hole outer wall 4.

Further, the heat dissipation portion 2 further includes first circumferential reinforcing ribs 31; the first circumferential bead 31 is provided on the outer circumferential side of the first heat dissipation zone 21.

Further, the heat dissipation portion 2 further includes a second circumferential bead 32, and the second circumferential bead 32 is disposed between the first heat dissipation region 21 and the second heat dissipation region 22.

Further, the heat radiating portion 2 further includes a third circumferential rib 33, and the third circumferential rib 33 is provided on the inner circumferential side of the second heat radiating portion 22, so that the rigidity of the rotor case can be more effectively enhanced.

Further, the second heat dissipation area 22 further includes radial ribs thereon.

In the further technical scheme, the first circumferential reinforcing ribs 31, the second circumferential reinforcing ribs 32, the third circumferential reinforcing ribs 33 and the radial reinforcing ribs are arranged, so that the rigidity of the rotor shell can be effectively increased, the structural mode of the rotor is improved, and the radiation noise related to the modal frequency of the rotor caused by the vibration deformation of the rotor is reduced.

Referring to fig. 4 in combination, the present application also discloses embodiments wherein the radial ribs form a first radial projection 51 on the inner surface of the housing end wall 1; a second radial bulge 52 is formed on the outer surface of the end wall 1 of the shell, wherein the first radial bulge 51 can cut the air inlet airflow to enable the air inlet airflow to flow outwards in the radial direction under the action of centrifugal force when the motor runs, so that the noise generated inside the shell is reduced; the second radial projections 52 may more effectively increase the stiffness of the rotor housing.

Further, the first radial projection 51 and the second radial projection 52 have different thicknesses.

Further, the number of the first vents 211 is an odd number greater than 1.

Further, the number of the second ventilation openings 221 is an odd number greater than 1, which can prevent the rotor housing from generating large vibration and reduce noise.

Referring to fig. 5-6 in combination, the noise reduction effect spectrum comparison is performed on the rotor shell in the prior art and the rotor shell in the embodiment of the present application. Wherein, the air inlet 9 in the prior art in fig. 5 is a heat dissipation structure thereof, and the mixing scheme in fig. 6 is a technical scheme of the embodiment of the present application, obviously, the peak noise in the prior art scheme is higher than that in the technical scheme of the embodiment of the present application, and the broadband noise thereof is also significantly higher than that in the technical scheme of the embodiment of the present application, obviously, the present application effectively reduces the airflow noise. Moreover, the total value of the acoustic power in the technical solution of the embodiment of the present application is 62.6, and the total value of the acoustic power in the prior art is 73.8.

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

1. A rotor housing structure, comprising: a housing end wall (1); the end wall (1) of the shell comprises a heat dissipation part (2) and a shaft hole, and a shaft hole outer wall (4) is arranged in the shaft hole; the heat dissipation part (2) is arranged circumferentially around the outer wall (4) of the shaft hole, and the distance between any point on the heat dissipation part (2) and the central axis of the shaft hole is smaller than the radius of the stator insulation framework (8); the heat dissipation part (2) comprises a first heat dissipation area (21) and a second heat dissipation area (22) which are sequentially arranged towards the direction close to the center; a first ventilation opening (211) is formed in the first heat dissipation area (21); and a second ventilation opening (221) is formed in the second heat dissipation area (22).

2. The rotor housing structure according to claim 1, wherein the first ventilation openings (211) and the second ventilation openings (221) are circumferentially staggered.

3. The rotor housing structure according to claim 1, wherein the first heat dissipation area (21) further comprises circumferentially arranged air deflectors (212), and the first ventilation opening (211) is arranged between two adjacent air deflectors (212).

4. The rotor housing structure according to claim 3, characterized in that the air deflector (212) is fan-shaped.

5. The rotor housing structure according to claim 1, characterized in that the housing end wall (1) further comprises a fixing portion (3); the fixing part (3), the first heat dissipation area (21), the second heat dissipation area (22) and the shaft hole are sequentially arranged from the edge of the end wall to the center; the outer peripheral side of the first heat dissipation region (21) is connected to the fixing portion (3), and the inner peripheral side is connected to the second heat dissipation region (22); the outer peripheral side of the second heat dissipation area (22) is connected with the first heat dissipation area (21), and the inner peripheral side of the second heat dissipation area is connected with the shaft hole outer wall (4).

6. The rotor housing structure according to claim 4, wherein the heat radiating portion (2) further comprises a first circumferential reinforcing rib (31); the first circumferential bead (31) is provided on the outer circumferential side of the first heat dissipation region (21).

7. The rotor housing structure according to claim 5, characterized in that the heat dissipation portion (2) further comprises a second circumferential bead (32), the second circumferential bead (32) being disposed between the first and second heat dissipation regions (21, 22).

8. The rotor case structure according to claim 6, wherein the heat radiating portion (2) further includes a third circumferential bead (33), the third circumferential bead (33) being provided on an inner circumferential side of the second heat radiating section (22).

9. The rotor housing structure according to claim 1, characterized in that the second heat dissipation area (22) further comprises radial ribs thereon.

10. The rotor housing structure according to claim 9, characterized in that the radial bead forms a first radial projection (51) on the inner surface of the housing end wall (1); a second radial projection (52) is formed on the outer surface of the housing end wall (1).

11. The rotor housing structure according to claim 1, wherein the number of the first ventilation openings (211) is an odd number greater than 1.

12. The rotor housing structure according to claim 1, wherein the number of the second ventilation openings (221) is an odd number greater than 1.

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.