Heat dissipation structure and motor

Abstract

The invention discloses a heat dissipation structure, and the structure comprises an inner wall surface which is attached to an object to be subjected to heat dissipation; the outer wall surface and the inner wall surface are arranged in a spaced mode, the outer wall surface and the inner wall surface form a closed cavity, the outer wall surface is provided with a plurality of protruding parts of cavity structures, and the closed cavity is communicated with the cavity structures; and the closed cavity is filled with the phase change working medium, and the phase change working medium conducts heat transfer through phase change when the temperature difference exists between the inner wall face and the outer wall face. According to the heat dissipation structure provided by the invention, the cavity structure is adopted, so that the heat generated in the heat dissipation object is absorbed through the inner wall surface, the heat is transferred to the outer wall surface so as to be dissipated to the external environment, and the transfer of the heat is realized through the state conversion of the phase change working medium; the phase change working medium is in full contact with the outer wall of the heat dissipation object in the cavity structure to achieve instant heat transfer, the structure is simple, and the heat dissipation efficiency is high. The invention further provides a motor comprising the heat dissipation structure.

Description

Technical Field

[0001] The present invention relates to the technical field of motor heat dissipation, and particularly relates to a heat dissipation structure and a motor. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy and is commonly used as a driving device to drive the movement of other equipment. During the operation of the motor when it is powered on, the copper conductor coils on the iron core or rotor disposed inside the motor will cause power loss due to having a certain resistance, and a part of the electrical energy will also be dissipated due to the magnetic hysteresis phenomenon and eddy current effect generated by the material and structure of the iron core. These dissipated electrical energies will be dissipated in the form of heat. The motor running for a long time will accumulate a large amount of heat, reducing the operating efficiency and lifespan of the motor. In the commonly used motor heat dissipation structures currently, setting up a fan structure is difficult to be properly installed due to the limitations of the motor structure and the usage position. Adding a heat dissipation fin structure has limited improvement in heat dissipation and will cause an increase in the weight of the motor, while adding a liquid cooling heat dissipation structure requires setting up an additional cooling system and pipelines, increasing the complexity and production cost of the motor product.

[0003] In the process of implementing the present invention, the inventor found that there is at least a technical problem of low heat dissipation efficiency in the existing heat dissipation structures. Therefore, how to provide a motor heat dissipation structure with high heat dissipation efficiency 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 to achieve efficient heat dissipation of the motor while ensuring the cost.

[0005] Another purpose of the present invention is to provide a motor provided with the above heat dissipation structure.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A heat dissipation structure, comprising:

[0008] An inner wall surface, which is disposed in contact with the object to be heat-dissipated;

[0009] An outer wall surface, which is spaced from the inner wall surface and forms a sealed cavity with the inner wall surface. The outer wall surface is provided with a plurality of protruding portions with cavity structures, and the sealed cavity communicates with the plurality of cavity structures;

[0010] A phase change working fluid, which is filled in the sealed cavity, and the phase change working fluid transfers heat through phase change when there is a temperature difference between the inner wall surface and the outer wall surface.

[0011] Preferably, in the above heat dissipation structure, the protruding portion is a heat dissipation fin protruding in the direction away from the heat dissipation object.

[0012] Preferably, in the above heat dissipation structure, a plurality of the heat dissipation fins are respectively arranged in several circumferential regions on the outer wall surface, and the heat dissipation fins in any one region are arranged at equal intervals and in parallel.

[0013] Preferably, in the above heat dissipation structure, a fan blade is further included, and the air flow blowing direction of the fan blade faces the heat dissipation fins.

[0014] Preferably, in the above heat dissipation structure, the inner wall surface is circumferentially attached to the outer periphery of the object to be cooled.

[0015] Preferably, in the above heat dissipation structure, the filling ratio of the phase change working fluid in the closed cavity is 10%-90%.

[0016] Preferably, in the above heat dissipation structure, the phase change working fluid is acetone or methanol.

[0017] Preferably, in the above heat dissipation structure, the material of the inner wall surface is copper or aluminum.

[0018] A motor is provided with the heat dissipation structure as described in any one of the above embodiments.

[0019] Preferably, in the above motor, the inner wall surface of the heat dissipation structure is attached to the outer wall of the rotating body, and the outer wall of the rotating body is a corrugated structure.

[0020] It can be seen from the above technical solutions that the present invention at least includes the following beneficial effects:

[0021] The heat dissipation structure provided by the present invention includes a sealed cavity formed by the spaced inner wall surface and outer wall surface, and further includes a phase change working fluid filled in the sealed cavity. Among them, the inner wall surface is attached to the object to be dissipated. Here, it should be noted that the inner wall surface can be an integral structure connected to the outer wall surface or the outer wall of the object to be dissipated. After the heat dissipation object generates heat, it will be immediately conducted to the position of the inner wall surface. At the same time, a phase change working fluid is filled and arranged in the sealed cavity. The fluid working fluid will be in full contact with the inner wall surface. After the inner wall surface receives the heat conducted by the heat dissipation object, it will heat up and become a high-temperature wall, and the heat will be transferred to the phase change working fluid with a lower temperature. The phase change working fluid evaporates after absorbing heat and takes away the heat of the inner wall surface to cool the heat dissipation object. The evaporated phase change working fluid will move in the sealed cavity to contact the outer wall surface. The outer wall surface is in contact with the external environment, and its temperature is lower than that of the evaporated phase change working fluid. The heat in the phase change working fluid will be transferred to the outer wall surface and then dissipated to the external environment, and the phase change working fluid will condense into a liquid state and return to the vicinity of the inner wall surface again to continuously cool the inner wall surface. In order to improve the heat dissipation efficiency of the outer wall surface, considering that the structure of the outer wall surface is not affected by the structure of the heat dissipation object, several convex parts with cavity structures are arranged on the outer wall surface. The gaseous phase change working fluid will move freely and fill each convex part, so as to obtain a larger contact area with the outer wall surface, and then the gaseous phase change working fluid will exchange heat and condense faster, improving the heat dissipation efficiency. The heat dissipation structure provided by the present invention forms a sealed cavity with a cavity structure on the outer wall of the heat dissipation object and fills a phase change working fluid in the sealed cavity. On the one hand, the sealed cavity with a cavity structure has a small weight gain for the equipment and a lower material cost. On the other hand, heat exchange is carried out through the phase change working fluid in the sealed cavity. With the help of the fluidity of the phase change working fluid in the liquid state, it fully exchanges heat with the heat dissipation object, and the point heat source appearing on the heat dissipation object can also be taken away by the heat exchange of the phase change working fluid. At the same time, the contact area between the gaseous phase change working fluid and the convex parts on the outer wall surface is large, and the heat exchange efficiency is high. After the entire heat dissipation structure is assembled, it can discharge the heat of the heat dissipation object by itself without external drive, which is more convenient and has a high heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic cross-sectional structure diagram of the heat dissipation structure provided by the embodiment of the present invention;

[0024] Figure 2 For Figure 1 the detailed drawing of the fins in area B in

[0025] Figure 3 Schematic diagram of the motor structure provided by the embodiment of the present invention;

[0026] Among them, 10 - sealed cavity; 110 - inner wall surface; 120 - outer wall surface; 130 - heat dissipation fins; 20 - rotating body. Specific embodiments

[0027] The core of the present invention lies in disclosing a heat dissipation structure to achieve efficient heat dissipation of the motor while ensuring the cost.

[0028] Another core of the present invention lies in providing a motor provided with the above heat dissipation structure.

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the content of the invention recorded in the claims in any way. Additionally, all the contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention recorded in the claims.

[0030] As Figure 1 and Figure 2 shown, the heat dissipation structure provided by the embodiment of the present invention includes a sealed cavity 10 formed by the spaced - apart inner wall surface 110 and outer wall surface 120, and also includes a phase - change working fluid filled in the sealed cavity. Among them, the inner wall surface 110 is arranged in contact with the object to be cooled. It should be noted here that the inner wall surface 110 can be an integral structure connected to the outer wall surface 120 or the outer wall of the object to be cooled. After the heat - generating object generates heat, it will immediately conduct the heat to the position of the inner wall surface 110. At the same time, a phase - change working fluid is filled and arranged in the sealed cavity 10. The fluid working fluid will be in full contact with the inner wall surface 110. After the inner wall surface 110 receives the heat conducted by the heat - generating object, it will heat up and become a high - temperature wall, and the heat will be transferred to the phase - change working fluid with a lower temperature. The phase - change working fluid evaporates after absorbing heat and takes away the heat of the inner wall surface 110 to cool the heat - generating object. The evaporated phase - change working fluid will move in the sealed cavity 10 to contact the outer wall surface 120. The outer wall surface 120 is in contact with the external environment and has a lower temperature compared with the evaporated phase - change working fluid. The heat in the phase - change working fluid will be transferred to the outer wall surface 120 and then dissipated to the external environment, and the phase - change working fluid will condense into a liquid state and return to the vicinity of the inner wall surface 110 again to continuously cool the inner wall surface 110. In order to improve the heat dissipation efficiency of the outer wall surface 120, considering that the structure of the outer wall surface 120 is not affected by the structure of the heat - generating object, several protruding parts with cavity structures are arranged on the outer wall surface 120. The gaseous phase - change working fluid will move freely and fill each protruding part, so as to obtain a larger contact area with the outer wall surface 120, and then enable the gaseous phase - change working fluid to exchange heat and condense faster, improving the heat dissipation efficiency.

[0031] The heat dissipation structure provided by the embodiment of the present invention forms a sealed cavity 10 with a cavity structure on the outer wall of the heat dissipation object, and fills a phase change working fluid in the sealed cavity 10. On the one hand, the sealed cavity 10 with the cavity structure has a relatively small weight increase and lower material cost. On the other hand, heat exchange is carried out through the phase change working fluid in the sealed cavity 10. By means of the fluidity of the phase change working fluid in the liquid state, it fully exchanges heat with the heat dissipation object, and the point heat sources that appear on the heat dissipation object can also be taken away by the heat exchange of the phase change working fluid. At the same time, the contact area between the gaseous phase change working fluid and the convex portions on the outer wall surface 120 is large, and the heat exchange efficiency is high. After the entire heat dissipation structure is assembled, it can discharge the heat of the heat dissipation object by itself without external drive, which is more convenient and has a high heat dissipation efficiency.

[0032] Furthermore, in the heat dissipation structure provided by the embodiment of the present invention, the convex portions on the outer wall surface 120 are to increase the surface area of the outer wall surface 120, thereby improving the heat dissipation effect between the phase change working fluid and the outer wall surface 120, and between the outer wall surface 120 and the external environment. It can protrude towards the heat dissipation object or away from the heat dissipation object. Preferably, the convex portions are heat dissipation fins 130 that protrude away from the heat dissipation object. The structural design in the direction away from the heat dissipation object is not affected by the heat dissipation object, and the fin structure is mature and easy to process. The cavity configuration of the heat dissipation fins 130 can also provide a larger contact surface for the phase change working fluid for heat dissipation.

[0033] On the basis of the above embodiment, preferably, the outer wall surface 120 is divided into several regions in the circumferential direction, and a plurality of heat dissipation fins 130 are arranged in each region. At the same time, in order to make the heat dissipation effect of each heat dissipation fin 130 more uniform, preferably, the heat dissipation fins 130 in any region are arranged at equal intervals and in parallel, so that the temperature gradient of the heat dissipation object is more uniform. It should be noted that there may be other components such as a distribution box in the region where the heat dissipation fins 130 are arranged on the outer wall surface 120, and the heat dissipation fins 130 at the corresponding positions are avoided and arranged around the distribution box.

[0034] It should be noted that in a specific embodiment of the present invention, the outer wall surface 120 is divided into four regions, so that the heat dissipation fins 130 are arranged in a parallel structure in four directions, rather than designed as a divergent structure along the radial direction. The structure of the heat dissipation fins 130 is more regular and the manufacturing is simpler, and the outer wall surface 120 of the four regions makes the heat dissipation structure easy to stack and transport stably.

[0035] It should be further noted that the shape and quantity of the heat dissipation fins 130 are adaptively designed according to the actual working conditions, and its structure is not limited to the standard fin structure.

[0036] To further optimize the above technical solution, in a specific embodiment of the present invention, there is also a fan blade, and the air flow direction when the fan blade rotates is towards the heat dissipation fins 130 to accelerate the heat dissipation efficiency between the heat dissipation fins 130 and the surrounding environment.

[0037] Further, in the heat dissipation structure provided by the embodiment of the present invention, the inner wall surface 110 surrounds and fits against the outer periphery of the object to be dissipated, so as to achieve full wrapping of the heat dissipation object and improve the heat dissipation effect.

[0038] Further, in the heat dissipation structure provided by the embodiment of the present invention, it is preferred that the filling ratio of the phase change working fluid in the closed cavity 10 is 10%-90%, so that the phase change working fluid can come into good contact with the inner wall surface 110 for morphological changes, and at the same time has sufficient gaseous movement space.

[0039] It should be noted that due to the connection structure of the closed cavity 10, the heat dissipation structure provided by the embodiment of the present invention can be set and used at any angle, and only the filling ratio of the phase change working fluid needs to be adjusted so that it can be in full contact with the inner wall surface 110.

[0040] Further, in the heat dissipation structure provided by the embodiment of the present invention, the phase change working fluid is used to transfer heat through morphological changes, and it can be a common refrigerant or refrigerant, or can also be a medium such as water, acetone, methanol, etc.

[0041] Further, in the heat dissipation structure provided by the embodiment of the present invention, it is preferred that the material of the inner wall surface 110 is a metal with good heat transfer performance such as copper or aluminum.

[0042] As Figure 3 shown, the embodiment of the present invention also provides a motor, and the outer periphery of the motor is provided with the heat dissipation structure provided by any of the above embodiments.

[0043] Further, in the above embodiment, the inner wall surface 110 of the heat dissipation structure is arranged to fit against the outer wall of the rotating body 20 of the motor to dissipate the heat in the rotating body 20 to the environment. In order to increase the contact area between the inner wall surface 110 and the rotating body 20 so that the heat in the rotating body 20 is transferred more quickly, it is preferred that the outer wall of the rotating body 20 is an uneven structure, a corrugated structure or a fin structure to increase the heat dissipation area and thus improve the heat dissipation efficiency of the rotating body 20.

[0044] The terms "first", "second", "left side" and "right side" in the description, claims and drawings of the present invention are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0045] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat dissipation structure, characterized in that, Comprising: An inner wall surface (110), arranged in contact with the object to be cooled; An outer wall surface (120), arranged at a distance from the inner wall surface (110) and forming a sealed cavity (10) with the inner wall surface (110), the outer wall surface (120) being provided with a plurality of convex portions having cavity structures, and the sealed cavity (10) communicating with the plurality of cavity structures; A phase change working fluid, filled in the sealed cavity (10), the phase change working fluid performing heat transfer through phase change when there is a temperature difference between the inner wall surface (110) and the outer wall surface (120).

2. The heat dissipation structure according to claim 1, characterized in that, The convex portion is a heat dissipation fin (130) protruding in a direction away from the heat dissipation object.

3. The heat dissipation structure according to claim 2, characterized in that, A plurality of the heat dissipation fins (130) are respectively arranged in a plurality of regions in the circumferential direction of the outer wall surface (120), and the heat dissipation fins (130) in any one region are arranged at equal intervals and in parallel.

4. The heat dissipation structure according to claim 2, characterized in that, It further includes a fan blade, and the air flow blowing direction of the fan blade faces the heat dissipation fin (130).

5. The heat dissipation structure according to claim 1, characterized in that, The inner wall surface (110) surrounds and fits on the outer periphery of the object to be cooled.

6. The heat dissipation structure according to claim 1, characterized in that, The filling ratio of the phase change working fluid in the sealed cavity (10) is 10% - 90%.

7. The heat dissipation structure according to claim 1, characterized in that, The phase change working fluid is acetone or methanol.

8. The heat dissipation structure according to claim 1, characterized in that, The material of the inner wall surface (110) is copper or aluminum.

9. A motor, characterized in that, A heat dissipation structure as described in any one of claims 1 - 8 is provided.

10. The motor according to claim 9, characterized in that, The inner wall surface (110) of the heat dissipation structure is arranged in contact with the outer wall of the rotating body (20), and the outer wall of the rotating body (20) is a corrugated structure.

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