A heat pipe cooling heat dissipation structure suitable for an electric spindle

Abstract

The application discloses a heat pipe cooling and radiating structure suitable for an electric spindle, which comprises a hollow cylinder type inner cavity arranged in the electric spindle, the inner wall surface of the inner cavity is V-shaped in the axial direction as a whole, the V-shaped vertex and both sides thereof are formed into an evaporation end of a heat pipe and are provided with a three-dimensional lattice structure body so as to improve mechanical strength and heat exchange area. Spiral flow channels are arranged on the inner wall surfaces of both sides of the V-shaped vertex area, the spiral direction of the flow channels is adapted to the rotating direction of the electric spindle, and the liquid heat exchange working medium is ensured to smoothly return to the V-shaped vertex area under the action of centrifugal force and the spiral flow channels. Through heat transfer, the liquid working medium is gasified into a gaseous state and diffused to a condensation end, and then condensed into a liquid state under the action of radiating fins, so that a circulating radiating process is formed. The heat pipe cooling and radiating structure not only improves the temperature uniformity of the electric spindle, but also can flexibly adjust the working medium and liquid charging amount according to actual requirements, and remarkably improves the working performance and reliability of the electric spindle.

Description

A heat pipe cooling structure suitable for electric spindles Technical Field

[0001] This invention belongs to the field of motor spindle cooling and heat dissipation technology, and relates to a temperature control technology for high-speed motor spindles, particularly a heat pipe cooling and heat dissipation structure suitable for electric spindles. Through innovative heat pipe design and heat dissipation scheme, it aims to solve the thermal management problem of high-speed motor spindles under high-speed and high-power operating conditions, and improve the temperature uniformity and machining accuracy of the spindle. Background Technology

[0002] The rapid development of industrial machine tools, especially in the field of high-precision machining, has placed increasingly stringent demands on the performance of electric spindles. The increasing requirements for higher speeds, speed control, low vibration levels, and high power in electric spindles necessitate the use of high-speed motors. As a core functional component of precision machine tools, the high-speed electric spindle optimizes transmission and improves work efficiency by cooperating with the spindle and mounting the motor within a motor sleeve. However, in practical applications, electric spindles generate a significant amount of heat during high-speed operation. Specifically, the main heat generation mechanisms of high-speed electric spindles during operation include motor heating, bearing friction, hydraulic friction, and electromagnetic heating. The presence of these heat sources leads to a significant increase in spindle temperature. Existing research and production practice show that spindle temperature variations have a direct impact on machining accuracy, with thermal errors accounting for 60-75% of the manufacturing errors in parts.

[0003] Currently, to meet the heat dissipation requirements of high-speed electric spindles, the industry has proposed various cooling solutions. Among these, a common method involves creating flow channels in the motor sleeve, with the cooling medium circulating around the sleeve to achieve cooling. The basic principle of this method is to use the flowing cooling medium to carry away the heat generated by the motor and spindle, thereby reducing the overall temperature of the spindle. However, while this method can reduce the temperature of the electric spindle to some extent, it has significant limitations. First, the cooling medium only flows on the outer wall of the motor sleeve and cannot directly act on the core parts of the spindle, thus not directly reducing the spindle's temperature; the internal temperature of the spindle remains high. Second, the temperature distribution across different parts of the spindle is uneven, resulting in significant temperature variations. Finally, under high-speed rotation, the flow of the cooling medium is affected by centrifugal force, limiting its heat dissipation effect.

[0004] Furthermore, while current cooling solutions can alleviate spindle temperature rise to some extent, their complex designs, high costs, and maintenance difficulties in practical applications negatively impact the overall performance and lifespan of the machine tool. For example, liquid cooling systems require additional pumps, piping, and cooling devices, increasing system complexity, energy consumption, and maintenance costs. Increasing the spindle surface area or using heat pipes for heat dissipation can lead to difficulties in recirculation of the working fluid under high-speed rotation due to centrifugal force affecting the fluid's flow. Moreover, traditional heat pipe designs struggle to balance strength and heat dissipation efficiency.

[0005] In summary, while current cooling technologies have alleviated the thermal problems of high-speed electric spindles to some extent, many shortcomings remain. Issues such as large spindle temperature variations, severe thermal deformation, and unstable machining accuracy remain prominent. Therefore, effectively reducing spindle temperature rise while ensuring high precision and high power output is a pressing technical problem that needs to be solved. Summary of the Invention

[0006] (I) Purpose of the Invention

[0007] To address the shortcomings and deficiencies of existing high-speed motor spindle cooling methods, such as large spindle temperature variations, uneven temperature distribution, low heat dissipation efficiency, and complex design, this invention aims to provide a heat pipe cooling structure suitable for electric spindles. This structure primarily utilizes a built-in cylindrical heat pipe structure within the spindle, combined with designs such as spiral flow channels, conical walls, and lattice structures to optimize the working fluid flow path, enhance heat conduction efficiency, and achieve heat transfer from the heat pipe to its end, ultimately cooled by fins. This results in uniform spindle temperature distribution and efficient heat dissipation, thereby reducing machining errors caused by temperature variations.

[0008] (II) Technical Solution

[0009] To achieve the objective of this invention and solve its technical problems, the present invention adopts the following technical solution:

[0010] A heat pipe cooling structure for electric spindles is provided to effectively dissipate heat and maintain the uniformity of spindle temperature during high-speed operation. The electric spindle includes a motor spindle concentrically fixed within a motor rotor and extending axially. Both ends of the motor spindle are rotatably supported by end caps at both ends of a motor sleeve and extend beyond the motor sleeve. Specifically:

[0011] The internal machining of the motor spindle forms a hollow cylindrical cavity that extends axially and is closed at both ends. The two ends of the hollow cylindrical cavity extend axially outside the motor sleeve, and the hollow cylindrical cavity is formed as a heat pipe structure.

[0012] The inner wall of the hollow cylindrical cavity is V-shaped along the axial direction. The space on one side of the V-shaped apex forms the first heat pipe cavity section, and the space on the other side forms the second heat pipe cavity section. Both the first heat pipe cavity section and the second heat pipe cavity section are conical structures with a small inner diameter at the outer end and a large inner diameter at the inner end.

[0013] The V-shaped apex of the hollow cylindrical inner cavity and the area near its axial sides form the evaporation end of the heat pipe structure and form a three-dimensional lattice structure. The three-dimensional lattice structure is designed to improve the mechanical strength of the space region where it is located and increase the heat exchange area of ​​the evaporation end of the heat pipe structure.

[0014] The inner wall surfaces of the first heat pipe inner cavity section and the second heat pipe inner cavity section are respectively formed with a first spiral flow channel and a second spiral flow channel. The spiral directions of the first spiral flow channel and the second spiral flow channel are opposite, and their respective spiral directions are adapted to the rotation direction of the electric spindle when it is working.

[0015] The hollow cylindrical inner cavity has two ends that extend axially out of the motor sleeve to form the condensation end of the heat pipe structure, and multiple heat dissipation fins are formed around each of their outer walls.

[0016] The hollow cylindrical inner cavity is filled with heat exchange medium. When the motor spindle rotates at high speed, the liquid heat exchange medium flows back to the V-shaped apex region under the combined action of the centrifugal force of high-speed rotation, the transport force of the spiral flow channel, and the support reaction force of the conical wall. The gaseous heat exchange medium, after absorbing heat and vaporizing, diffuses to the condensation end of the heat pipe structure and condenses into liquid under the action of the heat dissipation fins, forming a recurring heat dissipation process.

[0017] (III) Technical Effects

[0018] Compared with the prior art, the present invention has the following beneficial and significant technical effects:

[0019] (1) This invention improves the heat dissipation efficiency of the heat pipe by setting a hollow cylindrical inner cavity inside the motor spindle and arranging a V-shaped heat pipe structure inside the cavity, so that heat can be concentrated and conducted to the evaporation end of the heat pipe in the high-temperature area of ​​the spindle. The precise positioning of the V-shaped apex and the design of the spiral flow channel ensure that the liquid working fluid effectively flows back under the action of centrifugal force and the internal structure of the heat pipe, and achieves the uniform temperature effect of the spindle through the reciprocating flow of the working fluid, reducing the thermal error caused by uneven temperature, and significantly improving the working stability and machining accuracy of the electric spindle.

[0020] (2) By designing a spiral flow channel and a V-shaped conical wall on the inner wall of the heat pipe, this invention can more rationally control the direction of liquid working fluid recirculation during the high-speed rotation of the electric spindle of the rotating component. The spiral flow channel design is coordinated with the spindle rotation direction, effectively utilizing centrifugal force and fluid dynamics, so that the condensed liquid working fluid can smoothly recirculate to the evaporation end region of the heat pipe, thereby enhancing the circulation efficiency of the working fluid and significantly improving the overall heat dissipation performance of the heat pipe.

[0021] (3) The heat pipe structure of the present invention, through precise design, utilizes the uniformity of heat pipe temperature to make the overall temperature of the motor spindle more uniform. By rationally arranging the V-shaped structure and spiral flow channel, the liquid working fluid inside the heat pipe can flow back efficiently and absorb heat evenly at the evaporation end. Due to the uniform temperature effect of the heat pipe, the overall temperature distribution of the spindle is more uniform, thereby reducing thermal errors caused by uneven temperature and improving the stability and machining accuracy of the electric spindle in high-precision machining.

[0022] (4) The present invention has flexible temperature rise control capability, and the temperature rise of the spindle can be controlled according to different application requirements, such as changing the working fluid, changing the liquid volume, and changing the fin air cooling or air cooling method. This adjustability enables the present invention to adapt to a variety of different working environments, ensuring that the spindle can maintain the best working condition under various working conditions.

[0023] (5) The arrangement of the three-dimensional lattice structure used in this invention can improve strength and increase heat exchange area. The reasonable arrangement of the lattice structure effectively supports the flow of working fluid inside the heat pipe and improves heat transfer efficiency. The combination of the thermal conductivity and mechanical support of the lattice structure enables the heat pipe to operate stably for a long time under complex working conditions, further improving the reliability and service life of the electric spindle. Attached Figure Description

[0024] Figure 1 is a cross-sectional schematic diagram of the high-speed electric spindle involved in this invention;

[0025] Figure 2 is a schematic diagram of the heat pipe cooling structure applicable to electric spindles according to the present invention.

[0026] Figure 3 is a schematic diagram of the dot matrix structure arrangement of the V-shaped vertex region in this invention;

[0027] Figure 4 shows a schematic diagram of a common three-dimensional lattice structure. In the figure: (A) is a BCC structure, (B) is an FCC structure, (C) is an arched lattice structure, and (D) is a needle-wing structure.

[0028] Figure 5 is an enlarged view of the location of the heat dissipation fins in this invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1 is the motor spindle, 2 is the rear bearing, 3 is the front bearing assembly, 4 is the motor rotor, 5 is the motor stator, 6 is the motor sleeve, 7 is the heat dissipation fins, 8 is the spiral flow channel, 9 is the three-dimensional dot matrix structure, and 10 is the tool holder and cutting tool. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0032] This invention aims to provide a heat pipe cooling structure suitable for electric spindles. It mainly optimizes the working fluid flow path and enhances heat conduction efficiency by incorporating a cylindrical heat pipe structure inside the spindle, combined with designs such as spiral flow channels, conical walls, and lattice structures. This allows heat inside the electric spindle to be transferred from the heat pipe to its end, and finally cooled by fins, achieving uniform temperature distribution and efficient heat dissipation of the spindle, thereby reducing machining errors caused by temperature changes.

[0033] As a specific example, as shown in Figure 1, the heat pipe cooling structure of the present invention, applicable to electric spindles, is used to effectively dissipate heat and maintain the temperature uniformity of the motor spindle 1 during high-speed operation of the electric spindle. The electric spindle includes a motor spindle 1 that is concentrically fixed in the motor rotor 4 and extends axially. The motor rotor 4 is concentrically and rotatably disposed in the motor stator 5. Both ends of the motor spindle 1 are rotatably supported on the end caps at both ends of the motor sleeve 6 by the rear bearing 2 and the front bearing assembly 3 and extend outside the motor sleeve 6. One end of the motor spindle 1 is fixedly provided with a tool holder and a cutting tool 10, and wherein:

[0034] The heat pipe cooling structure of this invention for electric spindles mainly involves arranging V-shaped cylindrical heat pipes inside the motor spindle 1. The heat pipes contain spiral flow channels 8, three-dimensional lattice structures 9, etc. As shown in Figures 1 and 2, the interior of the motor spindle 1 is machined into a hollow cylindrical cavity extending axially and closed at both ends. Both ends of the hollow cylindrical cavity extend axially beyond the outside of the motor sleeve 6, and the hollow cylindrical cavity forms a heat pipe structure, meaning the heat pipe is formed inside the motor spindle 1. The inner wall of the hollow cylindrical cavity is V-shaped along the axial direction. The space on one side of the apex of the V-shape constitutes the first heat pipe cavity segment, and the space on the other side constitutes the second heat pipe cavity segment. Both the first and second heat pipe cavity segments are tapered structures with a smaller inner diameter at the outer axial end and a larger inner diameter at the inner axial end. In some preferred embodiments, the V-shaped apex of the hollow cylindrical cavity does not correspond to the center of the shaft, but should be positioned in the region of highest heat generation along the axial direction of the motor spindle 1. This region of highest heat generation is determined through thermal analysis and / or numerical simulation of the heat source distribution of the motor spindle. By placing the V-shaped apex at this location, the heat absorption effect of the heat pipe structure on the main heat source can be maximized, improving heat dissipation efficiency. Simultaneously, the inclination angles on both sides of the V-shaped structure can be optimized based on the length of the motor spindle, the heat source distribution characteristics, and the working fluid flow characteristics to ensure optimal reflux of the liquid working fluid under the action of centrifugal force, gravity, and the spiral flow channel on the inner wall, and to ensure that the gaseous working fluid can effectively diffuse to the condensation end after evaporation.

[0035] As shown in Figure 3, the V-shaped apex of the hollow cylindrical cavity and its axial sides near it form the evaporation end of the heat pipe structure, and a three-dimensional lattice structure 9 of suitable size and shape is formed therein. The three-dimensional lattice structure 9 is designed to improve the mechanical strength of the space region it occupies and increase the heat transfer area of ​​the evaporation end of the heat pipe structure. As shown in Figure 4, the three-dimensional lattice structure can adopt a body-centered cubic (BCC) structure, face-centered cubic (FCC) structure, arched lattice structure, or needle-fin structure with periodic lattice structures. The unit size, rod diameter, and arrangement of the lattice structure are designed through topology optimization to achieve the best balance between mechanical strength, heat transfer efficiency, and fluid resistance, and are specifically selected based on factors such as the type, viscosity, and filling volume of the working fluid. The lattice structure here can fill the large area of ​​suspension, improve strength, and at the same time, increase the heat transfer area of ​​the evaporation end, thereby improving the heat transfer power to a certain extent. Preferably, the porosity and pore size of the three-dimensional lattice structure can be precisely controlled by adjusting the size and shape of the unit cell, which is beneficial for customized design to meet the heat exchange requirements under different operating conditions. In addition, these periodic lattice structures also have good fluid permeability and capillary action.

[0036] As shown in Figures 1 and 2, spiral channels 8 are formed on the inner walls of the first and second heat pipe sections, respectively. The spiral directions of the left and right spiral channels 8 are opposite, and the spiral directions are adapted to the rotation direction of the electric spindle during operation. The rotation direction of the electric spindle during operation must be considered during the design. By selecting appropriate spiral directions on both sides, the condensed working fluid flows to the V-shaped tip position under the combined action of high-speed centrifugal force, the transport force of the rotating spiral channels, and the reaction force of the conical wall.

[0037] As shown in Figures 1 and 2, the two ends of the hollow cylindrical inner cavity that extend axially outside the motor sleeve form the condensation end of the heat pipe structure, and suitable heat dissipation fins 7 are arranged on the outer wall surface at the end position of the heat pipe. The number, spacing, thickness, height, etc. of the heat dissipation fins 7 can be determined by the heat generation power of the electric spindle, the heat power of the heat pipe, and the selection of air cooling or air cooling of the fins.

[0038] The hollow cylindrical cavity is filled with heat exchange medium. As shown in Figures 1, 2, and 3, when the electric spindle is working, the high-speed rotation causes the liquid working medium inside the heat pipe to concentrate in the V-shaped apex region. The V-shaped apex region is located at the maximum heating point of the electric spindle. Heat is transferred from the wall to the lattice structure. The lattice structure heats the liquid working medium, causing it to evaporate and boil into a gaseous state. The gas diffuses to the fins at both ends of the heat pipe, and after pre-cooling, it condenses back into a liquid state. Under the combined action of centrifugal force, the transport force of the rotating spiral groove, and the reaction force of the conical wall, the liquid working medium flows back to the apex of the V-shape. This cycle repeats, efficiently removing heat and achieving temperature uniformity of the electric spindle.

[0039] In some preferred embodiments, the hollow cylindrical inner cavity of the motor spindle 1, the three-dimensional lattice structure 9, the spiral flow channels 8, and the heat dissipation fins 7 are integrally formed by 3D printing. The shape of the three-dimensional lattice structure 9 can also be designed as honeycomb, mesh, or dendritic to maximize the specific surface area. The porosity, pore size, and distribution of the lattice structure are designed according to the type, viscosity, and surface tension of the heat transfer medium to optimize capillary action and phase change heat transfer. This three-dimensional lattice structure can improve the strength and stiffness of the structure while maintaining a high specific surface area, reducing deformation and damage during high-speed rotation, thereby ensuring the long-term reliable operation of the heat pipe structure.

[0040] In some preferred embodiments, the pitch, depth, and width of the spiral channel 8 in this invention vary along the axial direction. The pitch can gradually increase from the apex of the V-shape towards both ends, while the depth and width can gradually decrease from the apex of the V-shape towards both ends. This design can reduce the resistance of the liquid during the reflux process while ensuring sufficient transport capacity, thereby improving reflux efficiency. Simultaneously, the cross-sectional shape of the spiral channel can be designed as trapezoidal or semi-circular to further optimize fluid dynamics performance. Furthermore, the pitch of the spiral channel 8 is optimized according to the rotational speed of the motor spindle. Specifically, at high speeds, the pitch is reduced to enhance the transport efficiency of the liquid heat exchange medium; while at low speeds, the pitch is appropriately increased to avoid excessive blockage of liquid flow and ensure that the liquid heat exchange medium can smoothly reflux to the V-shaped apex region.

[0041] In some preferred embodiments, the heat exchange medium in this invention is selected as a low-boiling-point, high-latent-heat working medium. The amount of working medium filled can be adjusted between 30% and 70% of the heat pipe's inner cavity volume, and is specifically optimized according to the operating speed of the electric spindle, ambient temperature, and heat dissipation requirements. Simultaneously, nanoparticles can be added to the heat exchange medium to improve thermal conductivity, such as carbon nanotubes or metal oxide nanoparticles.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat pipe cooling structure for an electric spindle, the electric spindle comprising a motor spindle concentrically fixedly sleeved in a motor rotor and extending axially, wherein both ends of the motor spindle are rotatably supported by end caps at both ends of a motor sleeve and extend outside the motor sleeve, characterized in that: The internal machining of the motor spindle forms a hollow cylindrical cavity extending axially and closed at both ends. Both ends of the hollow cylindrical cavity extend axially beyond the outside of the motor sleeve, and the hollow cylindrical cavity forms a heat pipe structure. The inner wall of the hollow cylindrical cavity is V-shaped axially. The space on one side of the V-shaped apex forms a first heat pipe cavity segment, and the space on the other side forms a second heat pipe cavity segment. Both the first and second heat pipe cavity segments are conical structures with a smaller inner diameter at the outer axial end and a larger inner axial end. The V-shaped apex of the hollow cylindrical cavity and the surrounding area on both axial sides form the evaporation end of the heat pipe structure and have a three-dimensional lattice structure. The three-dimensional lattice structure is designed to improve the mechanical strength of its spatial region and increase the heat exchange area of ​​the heat pipe structure's evaporation end. The first heat pipe cavity... The inner walls of the first and second heat pipe sections are respectively formed with a first spiral flow channel and a second spiral flow channel. The spiral directions of the first and second spiral flow channels are opposite, and their respective spiral directions are adapted to the rotation direction of the electric spindle during operation. The two ends of the hollow cylindrical inner cavity that extend axially outside the motor sleeve form the condensation ends of the heat pipe structure, and multiple heat dissipation fins are formed around their respective outer walls. The hollow cylindrical inner cavity is filled with heat exchange medium. When the motor spindle rotates at high speed, the liquid heat exchange medium flows back to the V-shaped apex region under the combined action of the centrifugal force of high-speed rotation, the transport force of the spiral flow channel, and the support reaction force of the conical wall. The gaseous heat exchange medium that absorbs heat and vaporizes diffuses to the condensation end of the heat pipe structure and condenses into liquid under the action of the heat dissipation fins, forming a recurring heat dissipation process.

2. The heat pipe cooling structure for electric spindles according to claim 1, characterized in that, The V-shaped apex of the hollow cylindrical inner cavity is located in the region where the motor spindle generates the most heat along the axial direction. This region of highest heat generation is determined by thermal analysis and / or numerical simulation of the heat source distribution of the motor spindle in order to maximize the heat absorption effect of the heat pipe structure on the main heat source.

3. The heat pipe cooling structure for electric spindles according to claim 2, characterized in that, The tilt angles on both sides of the V-shaped structure are optimized based on the length of the motor spindle, the heat source distribution characteristics, and the working fluid flow characteristics. This ensures that the liquid working fluid achieves the best reflux effect under the action of centrifugal force, gravity, and the spiral flow channel on the inner wall, and ensures that the gaseous working fluid can effectively diffuse to the condensation end after evaporation, thereby improving the overall heat dissipation performance and temperature uniformity.

4. The heat pipe cooling structure for electric spindles according to claim 1, characterized in that, The three-dimensional lattice structure adopts a body-centered cubic structure, face-centered cubic structure, arched lattice structure, or needle-wing structure with periodic lattice structure. The unit size, rod diameter, and arrangement of the lattice structure are designed with topology optimization to achieve the best balance between mechanical strength, thermal conductivity, and fluid resistance.

5. The heat pipe cooling structure for electric spindles according to claim 4, characterized in that, The porosity and / or pore size of the three-dimensional lattice structure are precisely controlled by adjusting the size and shape of the unit cells to allow for customized design for heat exchange requirements under different operating conditions.

6. The heat pipe cooling structure for electric spindles according to claim 1, characterized in that, The hollow cylindrical inner cavity of the motor spindle, the three-dimensional lattice structure, the first spiral flow channel, the second spiral flow channel, and each heat dissipation fin are integrally formed by 3D printing. The shape of the three-dimensional lattice structure is designed as honeycomb, grid, or dendritic to maximize the specific surface area. The porosity, pore size, and distribution of the lattice structure are designed according to the type, viscosity, and surface tension characteristics of the heat exchange medium to optimize capillary action and phase change heat transfer effect.

7. The heat pipe cooling structure for electric spindles according to claim 1, characterized in that, The pitch, depth, and width of the first and second spiral channels vary along the axial direction. The pitch gradually increases from the V-shaped apex to both ends, while the depth and width gradually decrease from the V-shaped apex to both ends. The cross-sectional shape of the spiral channels is designed as trapezoidal or semi-circular.

8. The heat pipe cooling structure for electric spindles according to claim 7, characterized in that, The pitch of the first and second spiral channels is optimized according to the rotational speed of the motor spindle. At high speeds, the pitch is reduced to enhance the transport efficiency of the liquid heat exchange medium. At low speeds, the pitch is increased to avoid excessive blockage of the liquid flow and to ensure that the liquid heat exchange medium can flow back smoothly to the V-shaped apex region.

9. The heat pipe cooling structure for electric spindles according to claim 1, characterized in that, The number, spacing, thickness, and / or height of the heat dissipation fins are optimized based on the heat generation power of the electric spindle and the heat transfer capacity of the heat pipe structure.

10. The heat pipe cooling structure for electric spindles according to claim 1, characterized in that, The heat exchange medium is selected from low boiling point and high latent heat. The liquid volume of the medium is adjusted between 30% and 70% of the inner volume of the heat pipe, and is specifically optimized according to the working speed of the electric spindle, ambient temperature and heat dissipation requirements.

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