Rotor housing structure, outer rotor motor and washing machine having the same

Abstract

The present application provides a rotor housing structure, including: a housing end wall, a heat dissipation structure is arranged on the housing end wall, the heat dissipation structure is formed by a plurality of sheet-shaped air guide plates arranged circumferentially around a rotating shaft, and a vent is formed between two adjacent air guide plates. According to the rotor housing structure of the present application, not only can the pressure pulsation generated during the rotation of the rotor be effectively reduced, the air noise can be reduced, and the heat dissipation of the motor can be accelerated.

Description

Technical Field

[0001] The present application belongs to the technical field of motor heat dissipation, and specifically relates to a rotor housing structure, an outer rotor motor, and a washing machine having the same. Background Art

[0002] At present, when an external rotor motor rotates at high speed, it is easy to stir the air around the rotor due to its large size, generating large air noise.

[0003] However, the rotor shell surface of the outer rotor motor of the washing machine in the prior art mostly adopts a grid structure or opens a rectangular or circular air inlet on the rotor shell surface, and adds reinforcing ribs on the rotor shell surface to enhance the structural strength. This rotor shell surface structure makes the wind pressure flowing through the rotor shell surface larger, and the turbulent boundary layer has a large attachment area on the rotor shell surface, resulting in large pressure pulsation and large aerodynamic noise, and this air inlet form will lead to poor heat dissipation.

[0004] Therefore, how to provide a rotor shell structure, an outer rotor motor and a washing machine having the same that can effectively reduce the pressure pulsation generated during the rotation of the rotor, reduce air noise, and accelerate the heat dissipation of the motor has become an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present application is to provide a rotor housing structure, an outer rotor motor and a washing machine having the same, which can not only effectively reduce the pressure pulsation generated during the rotation of the rotor, reduce air noise, but also accelerate the heat dissipation of the motor.

[0006] In order to solve the above problems, the present application provides a rotor housing structure, comprising:

[0007] The end wall of the shell is provided with a heat dissipation structure, which is formed by a plurality of sheet-like air guide plates circumferentially arranged around the rotating shaft, and a vent is formed between two adjacent air guide plates.

[0008] Preferably, it also includes a fixed part; the fixed part, the heat dissipation structure and the rotating shaft are connected in sequence from the edge of the end wall to the center position; the first end of the sheet-like air guide plate in the length direction is connected to the fixed part, and the second end is connected to the rotating shaft.

[0009] Preferably, the width of the air guide plate gradually increases from a position close to the rotation axis to a position far from the rotation axis.

[0010] Preferably, at least one side of the air guide plate in the width direction is provided with a splitter tooth, and the splitter tooth is used to split the airflow flowing through the surface of the rotor shell.

[0011] Preferably, the wind guide plate is arranged to be inclined relative to the horizontal direction.

[0012] Preferably, the plurality of air guide plates arranged circumferentially around the rotation axis are arranged equidistantly, and the number of the air guide plates is an odd number.

[0013] Preferably, it also includes a hub, which is arranged on the heat dissipation structure and is integrally connected to the sheet-like air guide plate.

[0014] Preferably, radial reinforcing ribs are provided on the heat dissipation structure.

[0015] Preferably, the radial reinforcing ribs penetrate the air guide plate in the thickness direction of the air guide plate.

[0016] According to another aspect of the present application, an outer rotor motor is provided, comprising a rotor housing structure, characterized in that the rotor housing structure is the above-mentioned rotor housing structure.

[0017] According to another aspect of the present application, a washing machine is provided, comprising a rotor housing structure, characterized in that the rotor housing structure is the above-mentioned outer rotor motor.

[0018] The rotor housing structure provided in the present application is provided with a heat dissipation structure on the housing end wall, and the heat dissipation structure is formed by a plurality of sheet-shaped air guide plates arranged circumferentially around the rotating shaft, and a vent is formed between two adjacent sheet-shaped air guide plates. The sheet-shaped air guide plates can cut the airflow and reduce air noise. In addition, the air guide plate structure of the present application reduces the overall weight of the rotor, reduces energy loss during the rotation of the rotor, and improves the efficiency of the motor. The present application can also effectively reduce the pressure pulsation generated during the rotation of the rotor, reduce air noise, and accelerate the heat dissipation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a rotor housing structure according to an embodiment of the present application;

[0020] Figure 2 This is a schematic structural diagram of an air guide plate according to an embodiment of the present application;

[0021] Figure 3 A cross-sectional view of an air guide plate according to an embodiment of the present application;

[0022] Figure 4 for Figure 3 Enlarged view of area A in the middle;

[0023] Figure 5 This is a cross-sectional view of the radial reinforcement rib according to an embodiment of the present application.

[0024] The reference numerals are:

[0025] 1. Shell end wall; 2. Rotating shaft; 3. Heat dissipation structure; 31. Sheet air guide plate; 4. Ventilation port; 5. Fixed part; 6. Diverter tooth; 7. Hub; 8. Radial reinforcement rib. DETAILED DESCRIPTION

[0026] See also Figure 1 As shown, according to an embodiment of the present application, a rotor housing structure comprises: a housing end wall 1, a heat dissipation structure 3 is arranged on the housing end wall 1, the heat dissipation structure 3 is formed by a plurality of sheet-like air guide plates 31 arranged circumferentially around a rotating shaft 2, and a vent 4 is formed between two adjacent sheet-like air guide plates 31, in order to facilitate cutting of air and reduce air noise during the rotation of the motor, and the structure of the sheet-like air guide plates 31 of the present application reduces the overall weight of the rotor, reduces energy loss during the rotation of the rotor, and improves the efficiency of the motor.

[0027] Furthermore, it also includes a fixed part 5; the fixed part 5, the heat dissipation structure 3 and the rotating shaft 2 are connected in sequence from the edge of the shell end wall 1 to the center position; the first end of the sheet-like air guide plate 31 in the length direction is connected to the fixed part 5, and the second end is connected to the rotating shaft 2.

[0028] Furthermore, the width of the sheet-shaped air guide plate 31 gradually increases from a position close to the rotating shaft 2 to a direction away from the rotating shaft 2 .

[0029] Furthermore, the thickness of the sheet-shaped air guide plate 31 is 2.5 mm to 5 mm.

[0030] Furthermore, the thickness of the sheet-shaped air guide plate 31 is uniformly set.

[0031] See also Figure 2 As shown, the present application also discloses some embodiments, in which a splitter tooth 6 is provided on at least one side in the width direction of the sheet-like air guide plate 31, which splits the airflow when passing through the surface of the motor rotor shell, thereby reducing the wind pressure passing through the surface of the rotor shell and reducing the attachment area of ​​the turbulent boundary layer on the surface of the rotor shell, thereby reducing pressure pulsation and further reducing aerodynamic noise.

[0032] Furthermore, the number of the diverter teeth 6 is an odd number.

[0033] Furthermore, the tooth pitch is set to T, T = (outer edge radius of the sheet-like air guide plate 31 - root radius of the sheet-like air guide plate 31) * (1% ~ 2%), the tooth height is set to h, h = (outer edge radius of the sheet-like air guide plate 31 - root radius of the sheet-like air guide plate 31) * (0.6% ~ 0.8%), and the sawtooth thickness is the same as the sheet-like air guide plate 31.

[0034] Furthermore, the splitter teeth 6 are V-shaped sawtooth shapes.

[0035] Furthermore, the splitter tooth 6 is tidal or wave-shaped.

[0036] See also Figure 3As shown, the present application also discloses some embodiments, in which the sheet-like air guide plate 31 is tilted relative to the horizontal direction, thereby increasing the gap of the air inlet of the sheet-like air guide plate 31, increasing the air intake volume inside the rotor, facilitating air exchange inside and outside the rotor, and solving the problems of low rotor intake air volume and untimely heat dissipation.

[0037] See also Figure 4 As shown, the present application also discloses some embodiments, in which the inclination angle a of the sheet-like air guide plate 31 and the horizontal plane is 6° to 8°. It is verified through simulation that this angle is beneficial to reducing motor noise. During the rotation of the motor, air can enter the interior of the motor through the gap between the inclination angles, thereby achieving a heat dissipation effect on the motor.

[0038] Furthermore, the sheet-like air guide plate 31 on the rotor shell is designed to be in the shape of a fan blade. During the high-speed rotation of the motor, the function of the diverter tooth 6 is to quickly divert a part of the wind pressure, reduce the noise caused by air turbulence, and reduce the noise generated by the friction between wind pressure and air. At the same time, the diverter tooth 6 is conducive to shearing the air, so that the air flows through the surface of the fan blade along the direction of the diverter tooth 6, and at the same time, it can also offset the vortex formed at the edge of the fan blade, thereby offsetting the noise generated by the vortex at the edge.

[0039] Furthermore, a plurality of lamellar air guide plates 31 circumferentially arranged around the rotating shaft 2 are arranged at equal intervals, and the number of the lamellar air guide plates 31 is an odd number, so as to prevent resonance of the lamellar air guide plates 31 during the rotation of the motor.

[0040] Furthermore, it also includes a hub 7, which is arranged on the heat dissipation structure 3 and is integrally connected to the sheet-like air guide plate 31, plays the role of a circumferential reinforcement rib, and can reduce the vibration of the sheet-like air guide plate 31 and reduce vibration noise.

[0041] See also Figure 5 As shown, the present application also discloses some embodiments, in which radial reinforcing ribs 8 are provided on the heat dissipation structure 3 .

[0042] Furthermore, radial reinforcing ribs 8 are provided on the sheet-like air guide plate 31 .

[0043] Furthermore, the radial reinforcing ribs 8 are arranged at equal distances.

[0044] Furthermore, the radial reinforcing ribs 8 penetrate the sheet-like air guide plate 31 in the thickness direction of the sheet-like air guide plate 31 .

[0045] Furthermore, the thickness of the radial reinforcement ribs 8 is designed in a gradient manner. At the end close to the rotating shaft 2, the radial reinforcement ribs 8 are thicker and penetrate the sheet-like air guide plate 31, while at the end away from the rotating shaft 2, the radial reinforcement ribs 8 are thinner, thereby improving the structural rigidity of the rotor housing.

[0046] Furthermore, noise reduction holes are provided on the sheet-like air guide plate 31, and the direction of the noise reduction holes follows the direction of the air streamline when the motor rotates. After the air flows through the holes, small vortices are formed, which interact with the original sound field to reduce noise.

[0047] Furthermore, noise reduction grooves are provided on the upper surface of the sheet-like air guide plate 31. The noise reduction groove structure is a dimple similar to the surface structure of a golf ball, which conforms to the principles of aerodynamics. When the motor rotates, these dimples can reduce air resistance and noise.

[0048] Furthermore, the thickness is designed in a gradient, where the radial reinforcement ribs 8 are thicker at the end close to the rotating shaft 2 and penetrate the sheet-like air guide plate 31, and are thinner at the end away from the rotating shaft 2. The radial reinforcement ribs 8 are evenly distributed around the rotating shaft 2.

[0049] According to an embodiment of the present application, an outer rotor motor includes a rotor housing structure, characterized in that the rotor housing structure is the above-mentioned rotor housing structure.

[0050] According to an embodiment of the present application, a washing machine includes a rotor housing structure, characterized in that the rotor housing structure is the above-mentioned outer rotor motor.

[0051] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0052] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A rotor housing structure, characterized in that: include: A shell end wall (1) is provided with a heat dissipation structure (3), the heat dissipation structure (3) being formed by a plurality of sheet-like air guide plates (31) arranged circumferentially around a rotating shaft (2), with a vent (4) formed between two adjacent sheet-like air guide plates (31); and further comprising a fixing portion (5); the fixing portion (5), the heat dissipation structure (3) and the rotating shaft (2) being connected in sequence from the edge of the shell end wall (1) to the center; the first end of the sheet-like air guide plate (31) in the length direction is connected to the fixing portion (5), and the second end is connected to the rotating shaft (2); the fixing portion, the heat dissipation structure (3) and the shell are arranged to rotate synchronously; the sheet-like air guide plate (31) is arranged to be inclined relative to the horizontal direction, and is inclined downward from the second end to the first end.

2. The rotor housing structure according to claim 1, characterized in that: The width of the sheet-shaped air guide plate (31) gradually increases from a position close to the rotation axis (2) to a position far from the rotation axis (2).

3. The rotor housing structure according to claim 1, characterized in that: At least one side of the sheet-shaped air guide plate (31) in the width direction is provided with a splitter tooth (6), and the splitter tooth (6) is used to split the airflow flowing through the surface of the rotor shell.

4. The rotor housing structure according to claim 1, characterized in that: The plurality of sheet-like air guide plates (31) arranged circumferentially around the rotating shaft (2) are arranged at equal intervals, and the number of the sheet-like air guide plates (31) is an odd number.

5. The rotor housing structure according to claim 1, characterized in that: It also comprises a wheel hub (7), wherein the wheel hub (7) is arranged on the heat dissipation structure (3) and is integrally connected to the sheet-shaped air guide plate (31).

6. The rotor housing structure according to claim 1, characterized in that: The heat dissipation structure (3) is provided with radial reinforcing ribs (8).

7. The rotor housing structure according to claim 6, characterized in that: The radial reinforcing ribs (8) penetrate the sheet-like air guide plate (31) in the thickness direction of the sheet-like air guide plate (31).

8. An outer rotor motor, comprising a rotor housing structure, characterized in that: The rotor housing structure is the rotor housing structure according to any one of claims 1 to 7.

9. A washing machine, comprising an outer rotor motor, characterized in that: The outer rotor motor is the outer rotor motor described in claim 8.

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