A heat dissipation structure of an outer rotor motor

Abstract

The present invention discloses a heat dissipation structure of an outer rotor motor and an outer rotor motor, wherein the heat dissipation structure of the outer rotor motor includes: a rotor flange, an axial flow fan assembly and a stator flange, the axial flow fan assembly is arranged between the rotor flange and the stator flange, the stator flange is provided with ventilation holes, an arc-shaped anti-leakage element is arranged on the outer edge of the stator flange, the anti-leakage element is located on the outer side of the axial flow fan assembly, and the rotor flange is connected to the axial flow fan assembly. The heat dissipation structure of the outer rotor motor provided by the present application is provided with an arc-shaped anti-leakage element on the outer edge of the stator flange, and the anti-leakage element adopts the structural form of half-enclosed axial flow fan assembly, has the function of a collector, greatly reduces radial leakage loss, and thus improves the heat dissipation effect of the heat dissipation structure. In addition, the present application has a simple structure, occupies a small space, and is easy to process and install.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to a heat dissipation structure of an outer rotor motor. In addition, the present invention also relates to an outer rotor motor comprising the heat dissipation structure of the outer rotor motor. Background Art

[0002] The working principle of the axial flow fan is that the gas enters from the air collector, passes through the impeller to make the air flow gain energy, then passes through the guide vane to convert part of the deflected kinetic energy into static pressure energy, and finally passes through the diffuser to convert part of the axial airflow kinetic energy into static pressure energy. If the axial flow fan lacks a collector, the performance of the guide vane and diffuser structure will be greatly reduced. Due to the limitation of the design space, these structures are not allowed to exist alone. In addition, since there must be a gap between the stationary element and the rotating element, part of the air volume of the axial flow fan will leak to the outside through the gap, resulting in a decrease in flow pressure.

[0003] In summary, how to solve the problem of flow pressure reduction of axial flow fans is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a heat dissipation structure for an outer rotor motor, which greatly reduces radial leakage losses and improves the heat dissipation effect; the structure is simple, occupies a small space, and is easy to process and install.

[0005] Another object of the present invention is to provide an outer rotor motor including the heat dissipation structure of the outer rotor motor.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A heat dissipation structure of an outer rotor motor comprises: a rotor flange, an axial flow fan assembly and a stator flange, wherein the axial flow fan assembly is arranged between the rotor flange and the stator flange, the stator flange is provided with ventilation holes, an arc-shaped anti-leakage element is arranged on the outer edge of the stator flange, the anti-leakage element is located on the outer side of the axial flow fan assembly, and the rotor flange is connected to the axial flow fan assembly.

[0008] Preferably, a plurality of heat dissipation ribs are arranged on the side of the stator flange facing the axial flow fan assembly, and all of the heat dissipation ribs are arranged along the radial direction of the stator flange.

[0009] Preferably, an annular mounting groove is provided on the side of the stator flange facing the axial flow fan assembly.

[0010] Preferably, the stator flange is provided with mounting screw holes.

[0011] Preferably, the axial flow fan assembly includes a fan inner wall, fan blades and a fan outer wall, the outer sides of the fan blades are connected to the inner circumferential surface of the fan outer wall, and the inner sides of the fan blades are connected to the outer circumferential surface of the fan inner wall.

[0012] Preferably, a flow guiding device is arranged in the ventilation hole.

[0013] Preferably, the flow guiding device is a guide rib protruding along the inner wall of the ventilation hole.

[0014] Preferably, the arrangement direction of the ventilation holes and the arrangement direction of the guide ribs are consistent, and the arrangement directions of the ventilation holes and the guide ribs have an angle of 60 to 120° with the axial direction of the stator flange.

[0015] An outer rotor motor comprises a rotor assembly, a stator assembly and a controller. The outer periphery of the rotor assembly and the stator assembly is provided with a heat dissipation structure of the outer rotor motor described in any one of the above items.

[0016] The heat dissipation structure of the outer rotor motor provided by the present application is provided with an arc-shaped anti-leakage element on the outer edge of the stator flange. The anti-leakage element adopts the structural form of a semi-enclosed axial flow fan assembly and has the function of a collector, which greatly reduces radial leakage loss, thereby improving the heat dissipation effect of the heat dissipation structure. In addition, the present application has a simple structure, occupies a small space, and is easy to process and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of the outer rotor motor provided by the present invention;

[0019] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0020] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0021] Figure 4 A cross-sectional view of the heat dissipation structure of the outer rotor motor provided by the present invention;

[0022] Figure 5 A partial cross-sectional view of a rotor assembly and a stator assembly provided by the present invention;

[0023] Figure 6 This is an analysis diagram of the airflow direction of the heat dissipation structure of the outer rotor motor provided by the present invention.

[0024] Figure 1-6 middle:

[0025] 1-rotor assembly, 2-stator assembly, 3-controller, 4-rotor flange, 5-fan blades, 6-fan outer wall, 7-leakage prevention element, 8-radial gap, 9-mounting screw hole, 10-axial gap, 11-mounting groove, 12-fan inner wall, 13-rotor housing, 14-air inlet, 15-stator flange, 16-heat dissipation ribs, 17-guide ribs. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The core of the present invention is to provide a heat dissipation structure for an outer rotor motor, which greatly reduces radial leakage losses and improves the heat dissipation effect; the structure is simple, occupies a small space, and is easy to process and install.

[0028] Another core of the present invention is to provide an outer rotor motor including the heat dissipation structure of the outer rotor motor.

[0029] Please refer to Figures 1 to 6 A heat dissipation structure of an outer rotor motor includes: a rotor flange 4, an axial flow fan assembly and a stator flange 15, the axial flow fan assembly is arranged between the rotor flange 4 and the stator flange 15, the stator flange 15 is provided with ventilation holes, an arc-shaped anti-leakage element 7 is arranged on the outer edge of the stator flange 15, the anti-leakage element 7 is located on the outer side of the axial flow fan assembly, and the rotor flange 4 is connected to the axial flow fan assembly.

[0030] It should be noted that the rotor flange 4 is arranged on the outer periphery of the rotor, the stator flange 15 is arranged on the outer periphery of the stator, the rotor flange 4 is connected to the axial flow fan assembly, the rotor flange 4, the rotor assembly 1 and the axial flow fan assembly rotate synchronously, and the axial flow fan assembly is installed on the outer periphery of the rotor housing 13 through the rotor flange 4. When the rotor assembly 1 rotates, the rotation of the axial flow fan assembly can form an axial airflow on the outer periphery of the rotor assembly 1.

[0031] Since the axial flow fan assembly, the rotor assembly 1 and the rotor flange 4 are all rotating elements, and the stator flange 15 is a stationary element, there must be a certain gap between these structural parts. The gap between the rotor flange 4 and the cooling fan is the air inlet 14. The larger the gap, the better. The size of the gap can be adjusted by adjusting the position of the rotor flange 4. The anti-leakage element 7 is an arc-shaped plate. The shape of the anti-leakage element 7 matches the outer peripheral shape of the axial flow fan assembly, and the curvature is consistent. The anti-leakage element 7 is arranged on the outside of the axial flow fan assembly. There is a radial gap 8 between the anti-leakage element 7 and the axial flow fan assembly. The smaller the radial gap 8, the higher the efficiency.

[0032] The heat dissipation structure of the outer rotor motor provided by the present application is provided with an arc-shaped anti-leakage element 7 on the outer edge of the stator flange 15. The anti-leakage element 7 adopts the structural form of a semi-enclosed axial flow fan assembly and has the function of a collector, which greatly reduces radial leakage loss, thereby improving the heat dissipation effect of the heat dissipation structure. In addition, the present application has a simple structure, occupies a small space, and is easy to process and install.

[0033] On the basis of the above embodiment, as a further preference, a plurality of heat dissipation ribs 16 are arranged on the side of the stator flange 15 facing the axial flow fan assembly, and all the heat dissipation ribs 16 are arranged along the radial direction of the stator flange 15. The heat dissipation ribs 16 protrude along the stator flange 15 toward the axial flow fan assembly. When the rotor assembly 1 rotates, the winding of the stator assembly 2 generates heat, which is transferred to the heat dissipation ribs 16 through heat conduction. At this time, the axial flow fan assembly rotates to absorb air, and the fluid flows in from the air duct inlet between the rotor flange 4 and the axial flow fan assembly, and flows out from the air duct outlet between the axial flow fan assembly and the heat dissipation ribs 16, and the heat of the corresponding stator assembly 2 is removed through convection heat exchange. There is an axial gap 10 between the axial flow fan assembly and the stator flange 15. When the axial gap 10 is set as small as possible, the height of the heat dissipation ribs 16 of the stator flange 15 can be increased to improve the heat dissipation capacity.

[0034] The stator assembly 2 and the rotor assembly 1 are axially assembled. In order to improve the sealing between the stator assembly 2 and the rotor assembly 1, based on the above embodiment, as a further preferred embodiment, an annular mounting groove 11 is provided on the side of the stator flange 15 facing the axial flow fan assembly. The end of the rotor assembly 1 is an annular structure, and the rotor assembly 1 is inserted into the annular mounting groove 11, which can improve the waterproof and dustproof performance.

[0035] In order to facilitate the installation of the outer rotor motor, based on the above embodiment, as a further preferred embodiment, the stator flange 15 is provided with a mounting screw hole 9. The mounting screw hole 9 is provided through the stator flange 15, and the stator flange 15 can be fixed to the external structure by the mounting bolts in the mounting screw hole 9.

[0036] Regarding the structural form of the axial flow fan assembly, based on the above embodiment, as a further preferred embodiment, the axial flow fan assembly includes a fan inner wall 12, blades 5 and a fan outer wall 6, the outer side of the blades 5 is connected to the inner circumference of the fan outer wall 6, and the inner side of the blades 5 is connected to the outer circumference of the fan inner wall 12. The fan blades 5 are curved arc blades or straight blade blades. It can be seen from experimental results that the performance of the curved arc blades is better than that of the straight blade blades. The straight blade blades have no requirements for steering, can rotate forward or reverse, and have stronger adaptability.

[0037] In order to enhance the guiding property of the airflow and increase the flowability of the airflow along the ventilation hole, based on the above embodiment, as a further preferred embodiment, a guide device is provided in the ventilation hole. Preferably, the guide device is a guide rib 17 protruding along the inner wall of the ventilation hole. The guiding direction of the guide rib 17 is the same as the setting direction of the ventilation hole. After the airflow flows out from the guide rib 17, the heat dissipation rib 16 provides a downward deflection guide for the airflow, forcing part of the radial flow to be transformed into axial flow, which greatly improves the efficiency of the axial flow fan.

[0038] On the basis of the above embodiment, as a further preference, the setting direction of the ventilation holes is consistent with the setting direction of the guide rib 17, and the setting direction of the ventilation holes and the setting direction of the guide rib 17 have an angle of 60 to 120° with the axial direction of the stator flange 15.

[0039] At the impeller inlet NN section, the airflow flows into the impeller at an absolute speed c1. Since the impeller moves with a circumferential speed u1, the gas enters the impeller at a relative speed w1 relative to the impeller. Similarly, at the impeller outlet MM, the gas flows out at a relative speed w2. The outlet gas moves with a circumferential speed u2, and the airflow flows out at an absolute speed c2. The inlet and outlet impeller speed triangles are shown in the figure. The impeller inlet direction angle β1 is the angle between the circumferential speed u1 and the relative speed w1, and the impeller inlet direction angle β2 is the angle between the circumferential speed u2 and the relative speed w2. Generally, β2 is required to be greater than β1, and the efficiency will be better, otherwise the efficiency will drop sharply.

[0040] In addition to the heat dissipation structure of the outer rotor motor described above, the present invention further provides an outer rotor motor, including a rotor assembly 1, a stator assembly 2 and a controller 3, wherein the heat dissipation structure of the outer rotor motor disclosed in any of the above embodiments is arranged on the periphery of the rotor assembly 1 and the stator assembly 2. The structures of other parts of the outer rotor motor can be referred to the prior art, and will not be described in detail herein.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] The heat dissipation structure of the outer rotor motor and the outer rotor motor provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A heat dissipation structure of an outer rotor motor, characterized in that: include: A rotor flange (4), an axial flow fan assembly and a stator flange (15), wherein the axial flow fan assembly is arranged between the rotor flange (4) and the stator flange (15), the stator flange (15) is provided with ventilation holes, an arc-shaped anti-leakage element (7) is arranged on the outer edge of the stator flange (15), the anti-leakage element (7) is located on the outer side of the axial flow fan assembly, and the rotor flange (4) is connected to the axial flow fan assembly; The rotor flange (4) is arranged on the outer periphery of the rotor, the stator flange (15) is arranged on the outer periphery of the stator, the rotor flange (4), the rotor assembly (1) and the axial flow fan assembly rotate synchronously, the axial flow fan assembly is installed on the outer periphery of the rotor housing (13) through the rotor flange (4), and when the rotor assembly (1) rotates, the rotation of the axial flow fan assembly can form an axial airflow on the outer periphery of the rotor assembly (1); A plurality of heat dissipation ribs (16) are arranged on the side of the stator flange (15) facing the axial flow fan assembly, and all the heat dissipation ribs (16) are arranged along the radial direction of the stator flange (15); the heat dissipation ribs (16) protrude along the stator flange (15) toward the axial flow fan assembly, and when the rotor assembly (1) rotates, the winding of the stator assembly (2) generates heat, which is transferred to the heat dissipation ribs (16) through heat conduction. The axial flow fan assembly rotates to absorb air, and the fluid flows into the air duct inlet between the rotor flange (4) and the axial flow fan assembly, and flows out from the air duct outlet between the axial flow fan assembly and the heat dissipation ribs (16), and the heat of the corresponding stator assembly (2) is removed through convection heat exchange; The stator flange (15) is provided with an annular mounting groove (11) on the side facing the axial flow fan assembly, the end of the rotor assembly (1) is an annular structure, and the rotor assembly (1) is inserted into the annular mounting groove (11); A flow guide device is arranged in the ventilation hole; The flow guide device is a guide rib (17) protruding along the inner wall of the ventilation hole; The arrangement direction of the ventilation holes is consistent with the arrangement direction of the guide rib (17), and the arrangement direction of the ventilation holes and the arrangement direction of the guide rib (17) have an angle of 60 to 120 degrees with the axial direction of the stator flange (15).

2. The heat dissipation structure of the outer rotor motor according to claim 1, characterized in that: The stator flange (15) is provided with mounting screw holes (9).

3. The heat dissipation structure of the outer rotor motor according to claim 1, characterized in that: The axial flow fan assembly comprises a fan inner wall (12), fan blades (5) and a fan outer wall (6), wherein the outer side of the fan blades (5) is connected to the inner circumference of the fan outer wall (6), and the inner side of the fan blades (5) is connected to the outer circumference of the fan inner wall (12).

4. An outer rotor motor, comprising a rotor assembly (1), a stator assembly (2) and a controller (3), characterized in that: The outer periphery of the rotor assembly (1) and the stator assembly (2) is provided with a heat dissipation structure of the outer rotor motor according to any one of claims 1 to 3.

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