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, on which a heat dissipation structure and a shaft hole are provided, an outer wall of the shaft hole is provided inside the shaft hole, the heat dissipation structure is formed by a plurality of air guide plates circumferentially arranged around the outer wall of the shaft hole, the axial positions of the blade tips and blade roots of the air guide plates are different, the installation angles of the blade tips and blade roots are different, and a circumferential ventilation opening is provided between two adjacent air guide plates. According to the rotor housing structure of the present application, due to the different axial positions of the blade tips and blade roots, the heat dissipation structure forms a circumferential ventilation opening, avoiding the direct impact of the incoming air flow on the stator winding when the motor rotates, reducing the overall vibration intensity of the motor stator, and reducing the vibration noise.

Description

Technical Field

[0001] This application belongs to the technical field of washing machines, and particularly relates to a rotor housing structure, an outer rotor motor, and a washing machine having the same. Background Art

[0002] At present, a direct-drive outer rotor motor generates a large amount of heat during high-speed operation, and excessive motor temperature rise will cause damage to the motor winding. Therefore, the heat dissipation structure is very important for the outer rotor motor.

[0003] However, for the direct-drive outer rotor motor used in the existing washing machines, most of its heat dissipation structures are axial air inlets. When the motor rotates, the air flow velocity around the rotor increases, the pressure decreases, and the atmospheric pressure forcibly presses the air into the rotor interior. This air inlet method not only is not conducive to motor heat dissipation, but also the incoming air flow directly impacts the stator winding inside the motor, resulting in increased vibration of the stator winding and generating a large amount of motor noise.

[0004] Therefore, how to provide a rotor housing structure, an outer rotor motor, and a washing machine having the same that can achieve independent air inlet inside the rotor during motor rotation and avoid the direct impact of the incoming air flow on the stator winding has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] Therefore, the technical problem to be solved by this application is to provide a rotor housing structure, an outer rotor motor, and a washing machine having the same that can achieve independent air inlet inside the rotor during motor rotation and avoid the direct impact of the incoming air flow on the stator winding.

[0006] To solve the above problems, this application provides a rotor housing structure, including: a housing end wall, on which a heat dissipation structure and a shaft hole are provided, an outer wall of the shaft hole is provided inside the shaft hole, the heat dissipation structure is formed by a plurality of air guide plates circumferentially arranged around the outer wall of the shaft hole, the axial positions of the blade tips and blade roots of the air guide plates are different, the installation angles of the blade tips and blade roots are different, and a circumferential ventilation opening is formed between two adjacent air guide plates.

[0007] Preferably, the blade tip of the air guide plate is inclined towards the inside of the rotor housing.

[0008] Preferably, the included angle between the air guiding surface of the air guide plate and the plane perpendicular to the central axis of the shaft hole is 30° to 35°.

[0009] Preferably, the axial projection of the heat dissipation structure is a solid circle.

[0010] Preferably, the axial distance between the blade tip and blade root of the air guide plate is 10 mm to 25 mm.

[0011] Preferably, the air guide plate is a sheet-shaped air guide plate.

[0012] Preferably, the housing end wall further includes a fixing portion; the fixing portion, the heat dissipation structure and the shaft hole are sequentially connected from the edge of the housing end wall to the central position; the top of the air guide plate is connected to the fixing portion, and the root is connected to the outer wall of the shaft hole.

[0013] Preferably, the air guide plate is integrally connected to the fixing portion.

[0014] Preferably, the two side edges of the air guide plate are any one of tidal shape, curved shape, straight shape or wavy shape.

[0015] Preferably, the shapes and sizes of the air guide plates are the same.

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

[0018] The housing end wall of the rotor housing structure provided by the present application is provided with a heat dissipation structure and a shaft hole. An outer wall of the shaft hole is arranged in the shaft hole. The heat dissipation structure is formed by a plurality of air guide plates arranged circumferentially around the outer wall of the shaft hole. The axial positions of the blade tops and blade roots of the air guide plates are different, and a circumferential ventilation opening is formed between two adjacent air guide plates. Since the axial positions of the blade tops and blade roots are different, a circumferential ventilation opening is formed, avoiding the direct impact of the air inflow on the stator winding when the motor rotates, reducing the overall vibration intensity of the motor stator, and reducing the vibration noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the rotor housing structure of the embodiment of the present application;

[0020] Figure 2 is a cross-sectional view of the rotor housing structure of the embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the inner surface structure of the rotor housing of the embodiment of the present application;

[0022] Figure 4 is Figure 3 an enlarged view of area A in

[0023] Figure 5 is a schematic diagram of the twisted structure of the air guide plate of the embodiment of the present application.

[0024] The reference numerals are shown as:

[0025] 1, housing end wall; 2, outer wall of shaft hole; 3, heat dissipation structure; 31, sheet-shaped air guide plate; 32, circumferential ventilation opening; 4, fixing portion. Detailed implementation manners

[0026] Referring to Figure 1 As shown, according to an embodiment of the present application, a rotor housing structure includes: a housing end wall 1, a heat dissipation structure 3 and a shaft hole are provided on the housing end wall 1, a shaft hole outer wall 2 is provided in the shaft hole, the heat dissipation structure 3 is formed by a plurality of air guide plates 31 circumferentially arranged around the shaft hole outer wall 2, the axial positions of the blade tips and blade roots of the air guide plates 31 are different, the installation angles of the blade tips and blade roots are different, and a circumferential ventilation opening 32 is formed between two adjacent air guide plates 31. In the above technical solution, due to the different axial positions of the blade tips and blade roots, the axial distance between the blade tips and blade roots forms a circumferential air inlet and a circumferential air outlet, changing the direction of the fluid flow path, changing the original axial air inlet to a circumferential air inlet, avoiding the direct impact of the air incoming flow on the stator winding, reducing the stator vibration and thus reducing the vibration noise.

[0027] Referring to Figures 2 - 4 As shown, the present application also discloses some embodiments, the blade tips of the air guide plates 31 are inclined towards the inside of the rotor housing, which can more effectively increase the air incoming flow velocity, increase the air intake volume inside the rotor, and reduce the temperature rise during the operation of the motor.

[0028] Referring to Figure 5 As shown, the present application also discloses some embodiments, the angle a between the air guiding surface of the air guide plate 31 and the plane perpendicular to the central axis of the shaft hole is 30-35°, which can increase the contact area between the air guide plate and the air incoming flow during the rotation of the rotor, increase the air stirring volume, strengthen the air convection during the rotation of the motor, increase the air intake volume of the rotor, and accelerate the heat dissipation of the motor.

[0029] Further, the axial projection of the heat dissipation structure 3 is a solid circle, that is, there is no gap in the circumferential position between two adjacent air guide plates 31, and this structure can prevent external water vapor from entering the inside of the motor.

[0030] Further, the axial distance h between the blade tips and blade roots of the air guide plate 31 is 10 mm - 25 mm.

[0031] Further, the housing end wall 1 further includes a fixing part 4; the fixing part 4, the heat dissipation structure 3 and the shaft hole are sequentially connected from the edge of the housing end wall 1 to the central position; the top of the air guide plate 31 is connected to the fixing part 4, and the root is connected to the shaft hole outer wall 2.

[0032] Further, the air guide plate 31 is integrally connected to the fixing part 4.

[0033] Further, the air guide plate 31 and the fixing part 4 are integrally connected by plastic.

[0034] Further, the air guide plate 31 and the fixing part 4 are integrally connected by metal.

[0035] Further, it also includes a side wall of the housing, which is circumferentially arranged along the edge of the fixing part 4 and perpendicular to the end wall 1 of the housing. The fixing part 4 is integrally connected to the side wall of the housing, which can enhance the connection strength of the rotor housing, reduce the vibration of the air guide plate 31, and thus greatly reduce the noise.

[0036] Further, the air guide plate 31 is a sheet-shaped air guide plate, which strengthens the structural strength of the rotor housing, increases the connection strength at the position of the outer wall 2 of the shaft hole, and is conducive to cutting air during the rotation of the motor, reducing the air noise.

[0037] Further, the circumferential ventilation opening 32 includes a circumferential air outlet and a circumferential air inlet.

[0038] Further, a circumferential reinforcing rib is also provided on the heat dissipation structure 3, which can effectively enhance the stiffness of the rotor housing, reduce the vibration of the air guide plate 31, and thus reduce the noise.

[0039] Further, the width of the air guide plate 31 gradually increases in the direction away from the shaft hole.

[0040] Further, the two side edges of the air guide plate are any one of tide-shaped, curve-shaped, straight-shaped or wavy-shaped. The beneficial effect of the above solution is that when the two side edges of the air guide plate 31 are curve-shaped, tide-shaped or wavy-shaped, the airflow will be divided when flowing through the surface of the motor rotor housing, so that the wind pressure flowing through the surface of the rotor housing is smaller, and the attachment area of the turbulent boundary layer on the surface of the rotor housing is reduced, thereby reducing the aerodynamic noise.

[0041] Further, the shapes and sizes of the air guide plates 31 circumferentially arranged around the outer wall 2 of the shaft hole are the same, so that the air inflow and outflow volumes of each circumferential ventilation opening 32 on the entire heat dissipation structure 3 are uniform, preventing the housing vibration caused by uneven air volume from forming noise.

[0042] 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.

[0043] 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.

[0044] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0045] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and variations can be made without departing from the technical principle of the present application, and these improvements and variations should also be regarded as within the protection scope of the present application.

Claims

1. A rotor housing structure, characterized in that, Comprising: A housing end wall (1), on which a heat dissipation structure (3) and a shaft hole are provided. An outer wall of the shaft hole (2) is provided in the shaft hole. The heat dissipation structure (3) is formed by a plurality of air guiding plates (31) circumferentially arranged around the outer wall of the shaft hole (2). The axial positions of the blade tips and blade roots of the air guiding plate (31) are different, and the installation angles of the blade tips and blade roots are different. A circumferential ventilation opening (32) is provided between two adjacent air guiding plates (31); Each of the air guiding plates (31) is a sheet-like air guiding plate.

2. The rotor housing structure according to claim 1, characterized in that, The blade tip of the air guiding plate (31) is inclined towards the inside of the rotor housing.

3. The rotor housing structure according to claim 1, characterized in that, The included angle between the air guiding surface of the air guiding plate (31) and the plane perpendicular to the central axis of the shaft hole is 30° to 35°.

4. The rotor housing structure according to claim 3, wherein, The axial projection of the heat dissipation structure (3) is a solid circle.

5. The rotor housing structure according to claim 1, characterized in that, The axial distance between the blade tip and the blade root of the air guiding plate (31) is 10 mm to 25 mm.

6. The rotor housing structure according to claim 1, characterized in that, The housing end wall (1) further includes a fixing portion (4); the fixing portion (4), the heat dissipation structure (3) and the shaft hole are sequentially connected from the edge of the housing end wall (1) towards the central position; the top of the air guiding plate (31) is connected to the fixing portion (4), and the root is connected to the outer wall of the shaft hole (2).

7. The rotor housing structure according to claim 6, wherein The air guiding plate (31) is integrally connected to the fixing portion (4).

8. The rotor housing structure according to claim 1, characterized in that, The two side edges of the air guiding plate (31) are any one of tidal shape, curve shape, straight shape or wave shape.

9. The rotor housing structure according to claim 1, characterized in that, The shapes and sizes of all the air guiding plates (31) are the same.

10. 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 9.

11. A washing machine, comprising a rotor housing structure, characterized in that, The rotor housing structure is the outer rotor motor according to claim 10.

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