CN110556965A - Rotor shell structure, outer rotor motor and washing machine with same - Google Patents

Abstract

The application provides a rotor housing structure, 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 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 housing structure, outer rotor motor and washing machine with same

technical field

The application belongs to the technical field of washing machines, and in particular relates to a rotor shell structure, an outer rotor motor and a washing machine having the same.

Background technique

At present, in the direct drive drum washing machine, the outer rotor type direct drive motor is generally used, the motor rotor is arranged on the outer periphery of the stator. The wind structure cools the stator and rotor.

However, the heat dissipation part is likely to cause relatively serious fluid noise, resulting in relatively loud motor noise. .

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

Contents of the invention

Therefore, the technical problem to be solved in the present application 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 problems, the present application provides a rotor housing structure, including: the housing end wall; the housing end wall includes a heat dissipation part and a shaft hole, the shaft hole is provided with an outer wall of the shaft hole; the heat dissipation part surrounds the shaft hole outer wall 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 insulating skeleton; the heat dissipation part includes a first heat dissipation area and a second heat dissipation area arranged in sequence toward the center; Air vents; second air vents are provided on the second heat dissipation area.

Preferably, the first ventilation openings and the second ventilation openings are alternately arranged along the circumferential direction.

Preferably, the first heat dissipation area further includes circumferentially arranged air deflectors, and the first vent is disposed between two adjacent air deflectors.

Preferably, the shape of the wind deflector is fan-shaped.

Preferably, the end wall of the housing further includes a fixed part; the fixed 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 peripheral side of the first heat dissipation area is connected to the fixed part, and the inner peripheral side It is connected with the second heat dissipation area; the outer peripheral side of the second heat dissipation area is connected with the first heat dissipation area, and the inner peripheral side 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 peripheral side of the first heat dissipation area.

Preferably, the heat dissipation part further includes a second circumferential reinforcing rib, and the second circumferential reinforcing rib is arranged between the first heat dissipation area and the second heat dissipation area.

Preferably, the heat dissipation part further includes a third circumferential reinforcing rib, and the third circumferential reinforcing rib is arranged on the inner peripheral side of the second heat dissipation area.

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

Preferably, a first radial protrusion is formed on the inner surface of the end wall of the shell of the radial rib; a second radial protrusion is formed on the outer surface of the end wall of the shell.

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

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

According to still another aspect of the present application, an external rotor motor is provided, including a rotor housing structure, the rotor housing structure being the above rotor housing structure.

According to still another aspect of the present application, a washing machine is provided, including an outer rotor motor, and the outer rotor motor is the above outer rotor motor.

The shell end wall of the rotor shell structure provided by this application; the shell end wall includes a heat dissipation part and a shaft hole, and the shaft hole outer wall is arranged in the shaft hole; The insulating frame is close to the outer wall of the shaft hole; the heat dissipation part includes a first heat dissipation area and a second heat dissipation area arranged in sequence toward the center; a first ventilation opening is arranged on the first heat dissipation area; a second ventilation opening is arranged on the second heat dissipation area. The second vent is more conducive to increasing the air intake flow and can reduce broadband fluid noise; the first vent can guide the flow direction of the fluid and reduce the discrete peak noise caused by the fluid passing through the stator slot. Using the first vent and the second vent at the same time can reduce fluid noise by about 11dB.

Description of drawings

Fig. 1 is a schematic diagram of the inner surface structure of the rotor housing structure of the embodiment of the present application;

Fig. 2 is the schematic diagram of the motor structure of the embodiment of the present application;

Figure 3 is a partial enlarged view of area C in Figure 1 of the present application;

Fig. 4 is a schematic diagram of the outer surface structure of the rotor housing of the embodiment of the present application;

Fig. 5 is a schematic diagram of the outer surface structure of the rotor housing in the prior art;

Fig. 6 is a comparison diagram of the noise reduction effect spectrum of the rotor housing of the embodiment of the present application and the structure of the rotor housing of the prior art.

The reference signs are indicated as:

1. Shell end wall; 2. Heat dissipation part; 21. First heat dissipation area; 211. First air vent; 212. Air deflector; 22. Second heat dissipation area; 221. Second air vent; 3. Fixed part ; 31. Sheet-like twisted blade-shaped wind deflector; 4. Outer wall of shaft hole; 51. First radial protrusion; 52. Second radial protrusion; 6. Stator positioning hole; 7. Stator; 8. Stator Insulating skeleton; 9. The air inlet of the prior art.

Detailed ways

As shown in Figures 1-2, according to an embodiment of the present application, a rotor housing structure includes: a housing end wall 1; the housing end wall 1 includes a heat dissipation part 2 and a shaft hole, and a shaft is arranged in the shaft hole The outer wall of the hole 4; the heat dissipation part 2 is arranged circumferentially around the shaft hole outer wall 4, 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 insulating skeleton 8; the heat dissipation part 2 includes the first The heat dissipation area 21 and the second heat dissipation area 22 ; the first heat dissipation area 21 is provided with a first ventilation opening 211 ; the second heat dissipation area 22 is provided with a second ventilation opening 221 . In the above technical solution, the second vent 221 can effectively increase the flow rate to cool the motor and reduce broadband fluid noise; the first vent 211 is more conducive to guiding the flow direction of the fluid and reducing the discrete peak noise caused by the fluid passing through the stator slot . Using the first vent 211 and the second vent 221 at the same time can reduce fluid noise by about 11 dB. When the motor is running, the airflow enters from the first ventilation opening 211 and the second ventilation opening 221, wherein the airflow entering from the second ventilation opening 221 flows radially outwards; ; Another part of the airflow flows outward from the first vent 211 and also flows out through the first vent 211 .

As shown in FIG. 3 , the present application also discloses some embodiments. The first ventilation opening 211 and the second ventilation opening 221 are alternately arranged along the circumferential direction, that is, the line connecting the two ventilation openings and the center point of the housing end wall 1 exists. The included angle, the structure is easier to guide the flow, so that when the airflow flowing from the inside to the outside leaves the inner ring and reaches the outer ring, the loss of airflow resistance is small, thereby reducing the regenerative airflow noise.

Further, the size of the included angle between the two vents and the center point of the housing end wall 1 has different optimal angle values at different speeds of the motor, so the included angle can be designed for a certain speed, which can be more effective The reduction of regenerative airflow noise.

Further, the first heat dissipation area 21 further includes air deflectors 212 disposed in the circumferential direction, and the first ventilation opening 211 is disposed between two adjacent air deflectors 212 .

Furthermore, the shape of the wind deflector 212 is fan-shaped, and the fan-shaped structure can also effectively improve the rotor stiffness. The radiation noise related to the modal frequency of the rotor caused by the vibration deformation of the rotor is relatively small and the frequency is relatively high, which can effectively reduce the Radiated noise caused by rotor vibration deformation.

Further, the housing end wall 1 also includes a fixed part 3; the fixed part 3, the first heat dissipation area 21 and 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 and the fixed The part 3 is connected, and the inner peripheral side is connected with the second heat dissipation area 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 is connected with the shaft hole outer wall 4 .

Further, the heat dissipation part 2 also includes a first circumferential reinforcing rib 31 ; the first circumferential reinforcing rib 31 is disposed on the outer peripheral side of the first heat dissipation area 21 .

Further, the heat dissipation part 2 further includes a second circumferential reinforcing rib 32 , and the second circumferential reinforcing rib 32 is arranged between the first heat dissipation area 21 and the second heat dissipation area 22 .

Further, the heat dissipation part 2 further includes a third circumferential reinforcing rib 33, which is arranged on the inner peripheral side of the second heat dissipation area 22, which can more effectively strengthen the rigidity of the rotor casing.

Further, the second heat dissipation area 22 also includes radial reinforcing ribs.

In the above further technical solution, setting the first circumferential reinforcing rib 31, the second circumferential reinforcing rib 32, the third circumferential reinforcing rib 33 and the radial reinforcing rib can effectively increase the rigidity of the rotor shell and improve the rotor structural mold. state, thereby reducing the radiated noise related to the modal frequency of the rotor caused by the vibration deformation of the rotor.

Referring to FIG. 4 , the present application also discloses some embodiments. The radial reinforcing ribs form a first radial protrusion 51 on the inner surface of the housing end wall 1; Radial projections 52, wherein the first radial projection 51 can cut the airflow at the air inlet when the motor is running, so that it can flow radially outward through the action of centrifugal force, reducing the noise generated inside the housing; the second radial projection 52 can increase the rigidity of the rotor shell more effectively.

Further, the thicknesses of the first radial protrusion 51 and the second radial protrusion 52 are different.

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

Further, the number of the second vents 221 is an odd number greater than 1, which can prevent the rotor casing from vibrating greatly and reduce noise.

Referring to FIGS. 5-6 , the present application compares the frequency spectrum of the noise reduction effect of the rotor housing in the prior art and the rotor housing of the embodiment of the present application. Among them, the air inlet 9 of the prior art in Fig. 5 is its heat dissipation structure, and the hybrid solution in Fig. 6 is the technical solution of the embodiment of the application. Obviously, the peak noise in the prior art solution is higher than the technical solution of the embodiment of the application, and its broadband noise It is also significantly higher than the technical solution of the embodiment of the present application. Obviously, the present application effectively reduces the airflow noise. Moreover, the total sound power of the technical solution of the embodiment of the present application is 62.6, and the total sound power of the prior art solution is 73.8.

According to an embodiment of the present application, an external rotor motor includes a rotor housing structure, and the rotor housing structure is the above rotor housing structure.

According to an embodiment of the present application, a washing machine includes an outer rotor motor, and the rotor housing structure is the above outer rotor motor.

Those skilled in the art can easily understand that, on the premise of no conflict, the above-mentioned advantageous modes can be freely combined and superimposed.

The above are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the protection scope of the application. Inside. The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the technical principle of the application. These improvements and modifications should also be It is regarded as the scope of protection of this application.

Claims (14)

1. A rotor housing structure, characterized in that it comprises: a housing end wall (1); the housing end wall (1) includes a heat dissipation part (2) and a shaft hole, and a shaft The outer wall of the hole (4); the heat dissipation part (2) is arranged circumferentially around the outer wall of the shaft hole (4), and the distance between any point on the heat dissipation part (2) and the central axis of the shaft hole is smaller than that of the stator insulating frame (8) radius; the heat dissipation part (2) includes a first heat dissipation area (21) and a second heat dissipation area (22) arranged in sequence towards the center; the first heat dissipation area (21) is provided with a first vent ( 211); the second heat dissipation area (22) is provided with a second vent (221). 2. The rotor housing structure according to claim 1, characterized in that, the first ventilation openings (211) and the second ventilation openings (221) are alternately arranged along the circumferential direction. 3. The rotor housing structure according to claim 1, characterized in that, the first heat dissipation area (21) further includes a circumferentially arranged wind deflector (212), and the first vent (211) is arranged Between two adjacent wind deflectors (212). 4. The rotor housing structure according to claim 3, characterized in that, the shape of the wind 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 fixed part (3); the fixed part (3), the first heat dissipation area (21) 1. 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 part (3), and the inner peripheral side is connected to the second heat dissipation area. The area (22) is connected; the outer peripheral side of the second heat dissipation area (22) is connected to the first heat dissipation area (21), and the inner peripheral side is connected to the outer wall (4) of the shaft hole. 6. The rotor housing structure according to claim 4, characterized in that, the heat dissipation part (2) further comprises a first circumferential reinforcing rib (31); the first circumferential reinforcing rib (31) is arranged on The outer peripheral side of the first heat dissipation area (21). 7. The rotor housing structure according to claim 5, characterized in that, the heat dissipation part (2) further comprises a second circumferential reinforcing rib (32), and the second circumferential reinforcing rib (32) is arranged on Between the first heat dissipation area (21) and the second heat dissipation area (22). 8. The rotor housing structure according to claim 6, characterized in that, the heat dissipation part (2) further comprises a third circumferential reinforcing rib (33), and the third circumferential reinforcing rib (33) is arranged on The inner peripheral side of the second heat dissipation area (22). 9. The rotor housing structure according to claim 1, characterized in that, the second heat dissipation area (22) further includes radial reinforcing ribs. 10. The rotor housing structure according to claim 9, characterized in that, the radial reinforcing rib forms a first radial protrusion (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, characterized in that, the number of the first ventilation openings (211) is an odd number greater than one. 12. The rotor housing structure according to claim 1, characterized in that, the number of the second vents (221) is an odd number greater than one. 13. An external rotor motor, comprising a rotor housing structure, characterized in that the rotor housing structure is the rotor housing structure described in any one of claims 1-12. 14. A washing machine comprising an outer rotor motor, characterized in that the outer rotor motor is the outer rotor motor as claimed in claim 13.