Air-to-air cooler using gravity heat pipe and motor using the same

Abstract

This invention relates to the field of motor cooling technology, aiming to solve the problems of insufficient heat exchange, difficulty in temperature control, and limited power density improvement in high-power-density motors due to their compact structure and conventional air-to-air cooling. It provides an air-to-air cooler using gravity heat pipes and a motor using this cooler. The cooler includes a housing connected to the motor. Inside the housing, a secondary air intake zone and a cooling zone are separated by a sealing baffle. The cooling zone has several spaced cooling pipes, with both ends of the cooling pipes penetrating the sealing baffle and the other end of the housing, respectively. The cooling zone is further divided into a first and a second air intake zone by a partition plate welded to the bottom surface of the housing and positioned away from the top of the housing. A skylight is opened at the top of the housing, housing an integrated gravity heat pipe assembly within a detachable steel plate. The heat pipe assembly consists of at least one row arranged in a staggered pattern, with the heat pipe spacing greater than the cooling pipe spacing. This invention enhances heat exchange to solve the problem of excessive motor temperature rise, and features a compact structure, low air resistance, easy maintenance, compatibility with various motor cooling types, and improved motor power density and operational stability.

Description

Technical Field

[0001] This invention relates to the field of motor cooling technology, and more specifically, to an air cooler using a gravity heat pipe and a motor using the cooler. Background Technology

[0002] In box-type motors, air-to-air cooling is a commonly used cooling method (common cooling type codes include IC611). The primary airflow circulates inside the motor, entering through the motor inlet and cooling the stator coil ends, rotor core, rotor copper bars, and straight sections of the stator coils before exiting through the motor outlet into the cooler. As the motor generates heat during operation, the circulation of the primary air removes the heat generated by the motor itself, and the temperature of the primary airflow also increases. The higher-temperature primary airflow exchanges heat with the air in the secondary airflow within the cooler, lowering the primary airflow temperature, and then re-enters the motor, thus completing the cycle.

[0003] The secondary air path is an open air path that draws in air from the atmosphere, exchanges heat with the secondary air path in the cooler, and then discharges the heated secondary air into the atmosphere. Usually, the power for both the primary and secondary air circulation can be achieved by using a fan coaxial with the motor rotor or by using an external auxiliary fan.

[0004] It is widely used in conventional air-cooled motors; however, with the increasing demand for higher power density and the increasingly compact design of motors, conventional cooling methods are less able to maintain the motor operating temperature within the allowable range (i.e., excessive motor temperature rise). Summary of the Invention

[0005] The present invention aims to provide an air-to-air cooler using gravity heat pipes and an electric motor using the cooler, in order to solve the problem that in the prior art, the heat exchange capacity of conventional air-to-air cooling methods for high power density motors is insufficient due to their compact structure, making it difficult to control the motor operating temperature within the allowable range and limiting the improvement of motor power density.

[0006] The embodiments of the present invention are implemented as follows: This invention provides an air cooler using a gravity heat pipe, which includes a cooler housing connected to a motor; The interior of the aforementioned cooler housing is divided into a secondary air intake zone and a cooling zone by a sealing baffle. The cooling zone is provided with a number of spaced cooling pipes. One end of each of the cooling pipes passes through the sealing baffle, and the other end of each cooling pipe passes through the end of the cooler housing away from the sealing baffle. The aforementioned cooling zone is divided into a first air intake zone and a second air intake zone by a partition plate. The partition plate is vertically welded to the inner bottom surface of the cooler housing, and the top of the partition plate is away from the top of the cooler housing. The top of the cooler housing is provided with a skylight, and a gravity heat pipe assembly is installed inside the skylight; the gravity heat pipe assembly is integrated into a steel plate, and the steel plate is detachably installed on the top of the cooler housing through the skylight. The aforementioned gravity heat pipe assembly includes at least one row of gravity heat pipes, with each row of gravity heat pipes arranged in an alternating pattern, and the distance between the gravity heat pipes is greater than the distance between a number of the aforementioned cooling pipes.

[0007] Due to the above technical solution, the secondary air intake area and the cooling area are separated by the sealing baffle, which avoids direct mixing of secondary and primary air and ensures efficient heat exchange of secondary air through the cooling pipe. The cooling area is further divided into the first air intake area and the second air intake area by the partition plate, which can guide the primary air to flow orderly through the cooling pipe area. Combined with the gravity heat pipe group that can be detachably installed through the skylight at the top, the gravity heat pipes are arranged in a staggered pattern with appropriate spacing to enhance the auxiliary cooling of primary air. The integrated design of the steel plate simplifies installation and maintenance. At the same time, the combination of the partition structure and the gravity heat pipe layout improves the heat exchange efficiency of the cooler while ensuring smooth airflow, reducing wind resistance, and adapting to the heat dissipation requirements of high power density motors.

[0008] Optionally: The gravity heat pipe includes a heating section and a heat dissipation section. The heating section is located inside the cooler shell and corresponds to the space above the cooling pipe. The heat dissipation section is located outside the cooler shell. The heating section and the heat dissipation section are separated by the steel plate. The gravity heat pipe is filled with a heat exchange medium. The heat exchange medium achieves heat transfer through evaporation and condensation cycles.

[0009] This configuration, by dividing the gravity heat pipe into a heating section and a heat dissipation section and separating them with the steel plate, ensures that the heating section precisely corresponds to the upper space of the cooling pipe inside the cooler shell and directly and efficiently contacts the primary air to be cooled. The heat dissipation section is exposed to the outside of the shell and rapidly exchanges heat with the low-temperature ambient air. Combined with the evaporation and condensation circulation of the heat exchange medium inside the pipe, this configuration maximizes the utilization of the heat exchange space inside the cooler and enhances the auxiliary cooling effect of the primary air. It also effectively isolates the heating and heat dissipation areas with the help of the steel plate, avoiding interference from the crossflow of hot and cold air. At the same time, it simplifies the installation and positioning structure of the gravity heat pipe, significantly improves the overall heat exchange efficiency of the cooler, and has minimal impact on the original airflow resistance of the cooler.

[0010] Optionally, the above-mentioned heating section and the above-mentioned heat dissipation section are respectively provided with a number of heat-absorbing fins and heat-dissipating fins in the axial direction.

[0011] With this configuration, the heat-absorbing fins can increase the contact area between the heat-receiving section and the high-temperature primary air path, and accelerate the heat absorption and evaporation of the heat exchange medium. The heat dissipation fins can expand the heat exchange area between the heat-releasing section and the external cold air, and promote the condensation of the heat exchange medium. This can significantly enhance the heat exchange efficiency of the entire gravity heat pipe process, without interfering with the original air path and installation layout of the cooler, and improve the auxiliary heat dissipation capacity without increasing the size of the equipment.

[0012] Optionally: the gravity heat pipe group consists of two rows of gravity heat pipes, and the adjacent rows of gravity heat pipes are staggered along the length of the cooler shell, with the stagger distance being one-half to one times the diameter of a single gravity heat pipe.

[0013] With this configuration, the two rows of staggered gravity heat pipes can fully fill the top space of the cooler shell, avoiding dead zones in the primary air flow in the heat exchange area. The staggered distance is controlled between one-half and one times the diameter of a single pipe, which can ensure that the primary air flows smoothly through the heated sections of each gravity heat pipe and maximize the contact probability between the primary air and the heated sections, thereby improving the overall heat exchange uniformity and efficiency without increasing air resistance.

[0014] Optionally: The heat exchange medium is low-pressure water, the inside of the gravity heat pipe is a sealed negative pressure environment, and the negative pressure value meets the requirement that low-pressure water boils and evaporates at a temperature of 70℃±5℃.

[0015] This configuration allows for rapid absorption of heat from the primary air path within the cooler, significantly improving the heat absorption efficiency of the gravity heat pipes. Furthermore, the low-pressure water source is widely available, cost-effective, and offers stable heat exchange performance. The negative pressure sealing structure ensures the tightness of the medium circulation, preventing leakage from affecting the heat exchange effect. It also matches the normal operating temperature conditions of the motor, eliminating the need for additional heating or cooling, thus exhibiting strong adaptability.

[0016] Optionally, the cooling pipes are thin-walled metal pipes, and the cooling pipes are arranged in an array inside the cooler housing.

[0017] This design, with its thin-walled metal tubes, facilitates heat transfer between the primary and secondary air paths. The array arrangement fully utilizes the space within the cooler housing, ensuring uniform contact between the primary air path and the cooling tubes. This not only improves the basic heat exchange efficiency but also provides a stable heat exchange space for the heated section of the gravity heat pipes above, without adding extra flow resistance to the primary air path.

[0018] Optionally, a sealing strip is provided between the steel plate and the edge of the skylight of the cooler housing, and the sealing strip is made of heat-resistant silicone rubber.

[0019] With this design, the silicone rubber sealing strip can effectively seal the gap between the steel plate and the edge of the skylight, preventing the leakage of high-temperature primary air inside the cooler shell or the intrusion of external cold air, thus avoiding heat exchange efficiency loss. In addition, the temperature resistance of silicone rubber is suitable for the high-temperature environment inside the cooler, and it can maintain the sealing performance for a long time. At the same time, it simplifies the sealing structure and does not affect the disassembly and maintenance of the gravity heat pipe assembly.

[0020] An electric motor that uses the cooler includes the aforementioned air cooler using gravity heat pipes; The bottom of the aforementioned cooler housing is connected to the motor body; The motor body has a primary airflow power source inside, and a secondary airflow power source is connected to the tail end of the motor body's shaft. The motor body includes a stator and a rotor. The motor body has a motor air inlet and a motor air outlet on the side near the cooler housing. The motor air inlet and the motor air outlet are respectively connected to the second air inlet area and the first air inlet area. The primary air path driven by the aforementioned primary air path power source circulates internally along the aforementioned motor air outlet, the aforementioned first air inlet area, the aforementioned second air inlet area, the aforementioned motor air inlet, and the aforementioned motor body; The secondary air path, driven by the power source, passes through the secondary air path inlet, the secondary air path inlet zone, the cooling pipe in the second inlet zone, and the cooling pipe in the first inlet zone in sequence inside the cooler to complete multi-stage heat exchange.

[0021] Due to the aforementioned technical solution, the cooler housing is directly connected to the bottom of the motor body. The motor air inlet and outlet are respectively connected to the second and first air inlets of the cooling zone. This allows the primary airflow to circulate orderly along the path of "motor body, motor outlet, first air inlet, second air inlet, motor inlet, motor body" under the drive of the primary airflow power source. This provides targeted cooling for heat-generating components such as the motor stator and rotor. Simultaneously, the secondary airflow power source at the tail end of the motor body's shaft drives secondary air through the cooling pipes to complete multi-stage heat exchange, efficiently removing the heat transferred by the primary airflow. The overall structure ensures precise connection and coordinated operation between the cooler and the motor body's airflow, simplifying the overall equipment layout while significantly improving motor heat dissipation efficiency and meeting the operational requirements of high-power-density motors.

[0022] Optionally: the primary airflow power source is an internal fan coaxial with the rotor of the motor body, and the secondary airflow power source is an external fan, which is coaxially connected to the rotor of the motor body.

[0023] With this configuration, both the internal and external fans are coaxial with the rotor of the motor body, eliminating the need for additional independent drive components. This simplifies the overall structure of the motor body, reduces equipment costs and failure rates. Simultaneously, the synchronous rotor drive enables the airflow to adaptively match the motor body's speed (i.e., heat generation power). The higher the load and the faster the motor body's speed, the stronger the airflow's heat dissipation capacity, ensuring that the heat dissipation efficiency adapts to the motor body's heat generation requirements in real time without consuming additional energy.

[0024] Optionally: The secondary air path driven by the power source of the above-mentioned secondary air path is an open air path, and the secondary air path is circulated along the atmosphere, the air inlet of the above-mentioned secondary air path, the air inlet area of ​​the above-mentioned secondary air path, the second air inlet area of ​​the above-mentioned second air inlet area, the first air inlet area of ​​the above-mentioned first air inlet area, the air outlet of the cooler, and the atmosphere.

[0025] With this configuration, the open secondary air path can directly draw in low-temperature air from the atmosphere. After passing through multiple air intake zones and exchanging heat with the primary air in the cooler, the air is discharged, continuously utilizing the low ambient temperature to remove heat. Furthermore, the design of multiple air intake zones ensures that the secondary air is evenly distributed within the cooler, improving the heat exchange efficiency with the primary air. At the same time, the open circulation eliminates the need for a closed air path, simplifying the structure while ensuring continuous heat dissipation, thus meeting the heat dissipation requirements of the motor body during long-term operation.

[0026] In summary, the air cooler using gravity heat pipes and the motor using the cooler disclosed in this invention have the beneficial effects of enhancing heat exchange to solve the problem of excessive temperature rise in high power density motors, having a compact structure, low wind resistance, convenient maintenance, adaptability to multiple cooling types of motors, and improving motor power density and operational stability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a front sectional view of an air cooler using a gravity heat pipe and an electric motor using the cooler, according to an embodiment of the present invention. Figure 2 This is a side view of an air cooler using a gravity heat pipe and an electric motor using the cooler, according to an embodiment of the present invention. Figure 3 This is a front sectional view of an air cooler using a gravity heat pipe in an embodiment of the present invention; Figure 4 This is a side sectional view of an air cooler using a gravity heat pipe in an embodiment of the present invention; Figure 5 This is a schematic diagram of another embodiment of an air cooler using a gravity heat pipe and an electric motor using the cooler, according to an embodiment of the present invention.

[0029] Icons: 1-Cooler housing, 2-Sealing baffle, 3-Secondary air intake zone, 4-Cooling zone, 5-Cooling pipe, 6-First air intake zone, 7-Second air intake zone, 8-Skylight, 9-Gravity heat pipe assembly, 10-Steel plate, 11-Gravity heat pipe, 12-Heating section, 13-Heat dissipation section, 14-Heat exchange medium, 15-Heat absorption fins, 16-Heat dissipation fins, 17-Motor body, 18-Primary air path power source, 19 - Secondary airflow power source, 20- Stator, 21- Rotor, 22- Motor air inlet, 23- Motor air outlet, 24- Inner fan, 25- Outer fan, 26- Left side heat exchange zone, 27- Middle heat exchange zone, 28- Right side heat exchange zone, 29- Motor air outlet, 30- First air inlet, 31- Second air inlet, 32- First baffle, 33- Second baffle, 34- Secondary airflow inlet, 35- Partition plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] Example 1 See Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment proposes an air cooler using a gravity heat pipe, including a cooler housing 1 connected to a motor; The interior of the cooler housing 1 is divided into a secondary air intake zone 3 and a cooling zone 4 by a sealing baffle 2. The interior of the cooling zone 4 is provided with several spaced cooling pipes 5. One end of each cooling pipe 5 passes through the sealing baffle 2, and the other end of each cooling pipe 5 passes through the end of the cooler shell 1 away from the sealing baffle 2. The cooling zone 4 is divided into a first air inlet zone 6 and a second air inlet zone 7 by a partition plate 35. The partition plate 35 is vertically welded to the inner bottom surface of the cooler housing 1, and the top of the partition plate 35 is away from the top of the cooler housing 1. A skylight 8 is provided on the top of the cooler housing 1, and a gravity heat pipe assembly 9 is provided inside the skylight 8; the gravity heat pipe assembly 9 is integrated on a steel plate 10, and the steel plate 10 can be detachably installed on the top of the cooler housing 1 through the skylight 8. The gravity heat pipe assembly 9 includes at least one row of gravity heat pipes 11, with each row of gravity heat pipes 11 arranged in an alternating pattern, and the distance between the gravity heat pipes 11 is greater than the distance between a number of cooling pipes 5.

[0033] Due to the above technical solution, the secondary air intake zone 3 and the cooling zone 4 are separated by the sealing baffle 2, which can prevent the secondary air from directly mixing with the primary air and ensure that the secondary air can efficiently exchange heat through the cooling pipe 5. The cooling zone 4 is further divided into the first air intake zone 6 and the second air intake zone 7 by the partition plate 35, which can guide the primary air to flow orderly through the area of ​​the cooling pipe 5. With the gravity heat pipe group 9 that can be detached and installed by the top skylight 8, the gravity heat pipe 11 with staggered arrangement and appropriate spacing can enhance the auxiliary cooling of the primary air, and the integrated design of the steel plate 10 can simplify the installation and maintenance. At the same time, the combination of the partition structure and the layout of the gravity heat pipe 11 can improve the heat exchange efficiency of the cooler, ensure smooth airflow, reduce wind resistance, and adapt to the heat dissipation requirements of high power density motors.

[0034] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The gravity heat pipe 11 includes a heating section 12 and a heat dissipation section 13. The heating section 12 is located inside the cooler shell 1 and corresponds to the space above the cooling pipe 5. The heat dissipation section 13 is located outside the cooler shell 1. The heating section 12 and the heat dissipation section 13 are separated by a steel plate 10. The gravity heat pipe 11 is filled with a heat exchange medium 14. The heat exchange medium 14 achieves heat transfer through evaporation and condensation cycles. By dividing the gravity heat pipe 11 into the heating section 12 and the heat dissipation section 13 and separating them with a steel plate 10, the heating section 12 precisely corresponds to the cooling space inside the cooler shell 1. The upper space of tube 5 is in direct and efficient contact with the primary air to be cooled. The heat dissipation section 13 is exposed to the outside of the shell and quickly exchanges heat with the low-temperature ambient air. Combined with the evaporation and condensation circulation of the heat exchange medium 14 inside the tube, it can maximize the use of the heat exchange space inside the cooler and enhance the auxiliary cooling effect of the primary air. It can also effectively isolate the heated and dissipated areas with the help of the steel plate 10, avoid the interference of hot and cold air flow, simplify the installation and positioning structure of gravity heat pipe 11, significantly improve the overall heat exchange efficiency of the cooler, and have minimal impact on the original airflow resistance of the cooler.

[0035] The heating section 12 and the heat dissipation section 13 are respectively provided with a number of heat-absorbing fins 15 and heat dissipation fins 16 along their axial directions. The heat-absorbing fins 15 can increase the contact area between the heating section 12 and the high-temperature primary air path and accelerate the heat absorption and evaporation of the heat exchange medium 14. The heat dissipation fins 16 can expand the heat exchange area between the heat dissipation section 13 and the external cold air and promote the condensation of the heat exchange medium 14. This can significantly enhance the heat exchange efficiency of the gravity heat pipe 11 throughout the entire process, without interfering with the original air path and installation layout of the cooler, and improve the auxiliary heat dissipation capacity without increasing the size of the equipment.

[0036] See Figure 1 , Figure 2 , Figure 3 and Figure 4 In the gravity heat pipe group 9, there are two rows of gravity heat pipes 11, and the adjacent rows of gravity heat pipes 11 are staggered along the length of the cooler shell 1. The stagger distance is one-half to one times the diameter of a single gravity heat pipe 11. The two rows of staggered gravity heat pipes 11 can fully fill the top space of the cooler shell 1, avoiding the formation of dead flow corners in the heat exchange area of ​​the primary air. The stagger distance is controlled at one-half to one times the diameter of a single pipe, which can ensure that the primary air flows smoothly through the heating section 12 of each gravity heat pipe 11, and maximize the contact probability between the primary air and the heating section 12, thereby improving the overall heat exchange uniformity and efficiency without increasing the air resistance.

[0037] The heat exchange medium 14 is low-pressure water, and the inside of the gravity heat pipe 11 is a sealed negative pressure environment. The negative pressure value meets the boiling and evaporation of low-pressure water at a temperature of 70℃±5℃. This can quickly absorb the heat from the primary air path in the cooler, greatly improving the heat absorption efficiency of the gravity heat pipe 11. In addition, low-pressure water is widely available, low in cost, and has stable heat exchange performance. The negative pressure sealing structure can ensure the tightness of the medium circulation and avoid leakage from affecting the heat exchange effect. At the same time, it matches the normal temperature conditions of motor operation, without the need for additional heating or cooling, and has strong adaptability.

[0038] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The cooling pipe 5 is a thin-walled metal pipe. The cooling pipe 5 is arranged in an array inside the cooler shell 1. The thin-walled metal pipe material is conducive to heat conduction between the primary air path and the secondary air path. The array arrangement can make full use of the space inside the cooler shell 1, ensure uniform contact between the primary air path and the cooling pipe 5, improve the basic heat exchange efficiency, and also reserve a stable heat exchange space for the heated section 12 of the gravity heat pipe 11 above, without adding extra flow resistance to the primary air path.

[0039] A sealing strip (not shown in the figure) is provided between the steel plate 10 and the edge of the skylight 8 of the cooler shell 1. The sealing strip is made of heat-resistant silicone rubber. The silicone rubber sealing strip can effectively seal the gap between the steel plate 10 and the edge of the skylight 8, prevent the leakage of high-temperature primary air inside the cooler shell 1 or the intrusion of external cold air, and avoid heat exchange efficiency loss. Moreover, the temperature resistance of silicone rubber is suitable for the high-temperature environment inside the cooler, and can maintain the sealing performance for a long time. At the same time, it simplifies the sealing structure and does not affect the disassembly and maintenance of the gravity heat pipe assembly 9.

[0040] Example 2 See Figure 1 , Figure 2 , Figure 3 and Figure 4 Based on Embodiment 1, this embodiment proposes a motor that uses the cooler, which includes the above-mentioned air cooler using gravity heat pipes. The bottom of the cooler housing 1 is connected to the motor body 17; The motor body 17 has a primary air path power source 18 inside, and a secondary air path power source 19 is connected to the tail end of the rotating shaft of the motor body 17. The motor body 17 includes a stator 20 and a rotor 21. The motor body 17 has a motor air inlet 22 and a motor air outlet 23 on the side near the cooler housing 1. The motor air inlet 22 and the motor air outlet 23 are respectively connected to the second air inlet zone 7 and the first air inlet zone 6. The primary air path driven by the primary air path power source 18 circulates internally along the motor air outlet 23, the first air inlet zone 6, the second air inlet zone 7, the motor air inlet 22, and the motor body 17. The secondary air path driven by the secondary air path power source 19 passes through the secondary air path inlet 34, the secondary air path inlet zone 3, the cooling pipe 5 in the second inlet zone 7 and the cooling pipe 5 in the first inlet zone 6 in sequence inside the cooler to complete multi-stage heat exchange.

[0041] Due to the above technical solution, the cooler housing 1 is directly connected to the bottom of the motor body 17. The motor air inlet 22 and the motor air outlet 23 are respectively connected to the second air inlet zone 7 and the first air inlet zone 6 of the cooling zone 4. The primary air path is driven by the primary air path power source 18 and circulates in an orderly manner along "motor body 17, motor air outlet 23, first air inlet zone 6, second air inlet zone 7, motor air inlet 22, motor body 17". This can specifically cool the heat-generating components such as the motor stator 20 and rotor 21. At the same time, the secondary air path power source 19 at the end of the motor body 17 shaft drives the secondary air to complete multi-stage heat exchange through the cooling pipe 5, which can efficiently remove the heat transferred by the primary air. The overall structure enables the cooler and the motor body 17 air path to be precisely connected and work together. While simplifying the overall layout of the equipment, it greatly improves the motor heat dissipation efficiency and adapts to the operating requirements of high power density motors.

[0042] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The primary airflow power source 18 is an internal fan 24 coaxial with the rotor 21 of the motor body 17, and the secondary airflow power source 19 is an external fan 25. The external fan 25 is coaxially connected with the rotor 21 of the motor body 17. Both the internal fan 24 and the external fan 25 are coaxial with the rotor 21 of the motor body 17, eliminating the need for additional independent drive components. This simplifies the overall structure of the motor body 17 and reduces equipment costs and failure rates. At the same time, the synchronous drive of the rotor 21 enables the airflow to adaptively match the speed (i.e., heat generation power) of the motor body 17. The higher the load and the faster the speed of the motor body 17, the stronger the heat dissipation capacity of the airflow, ensuring that the heat dissipation efficiency is adapted to the heat generation requirements of the motor body 17 in real time without consuming additional energy.

[0043] The secondary air path driven by the power source 19 is an open-type air path. The secondary air path circulates along the atmosphere, through the secondary air path inlet 34, the secondary air path inlet zone 3, the second inlet zone 7, the first inlet zone 6, the cooler outlet, and the atmosphere. It is used to remove the heat transferred by the primary air path. The open-type secondary air path can directly introduce low-temperature air from the atmosphere. After passing through the multiple inlet zones and fully exchanging heat with the primary air in the cooler, it is discharged. It can continuously utilize the low-temperature resources of the environment to remove heat. Moreover, the design of multiple inlet zones ensures that the secondary air is evenly distributed in the cooler, improving the heat exchange efficiency with the primary air. At the same time, the open circulation does not require the closure of the air path, which simplifies the structure while ensuring continuous heat dissipation and adapts to the heat dissipation requirements of the motor body 17 during long-term operation.

[0044] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The motor body 17 is cooled by an IC616 fan. The primary airflow power source 18 is an internal fan 24, and the secondary airflow power source 19 is an independently set external auxiliary fan (not shown in the figure). The airflow of the external auxiliary fan is 1.2 to 1.5 times that of the internal fan 24. For the IC616-cooled motor body 17, the independent external auxiliary fan is used as the secondary airflow power source 19, and its airflow is 1.2 to 1.5 times that of the internal fan 24. This can ensure that the secondary airflow is stable and controllable through independent drive, and is not affected by the speed fluctuation of the rotor 21 of the motor body 17. At the same time, the airflow ratio can make the secondary air fully accept the heat transferred by the primary airflow, avoid the heat exchange bottleneck caused by insufficient secondary airflow, significantly improve the overall heat dissipation efficiency of the motor, and meet the heat dissipation requirements of the high power density motor body 17.

[0045] The motor body 17 uses IC666 cooling. The primary air path power source 18 is an independently set first external auxiliary fan (not shown in the figure), and the secondary air path power source 19 is an independently set second external auxiliary fan (not shown in the figure). The wind speed adjustment of the first and second external auxiliary fans is synchronized. For the IC666 cooling type motor body 17, the primary and secondary air paths are driven by independent first and second external auxiliary fans, which can eliminate the dependence on the rotor 21 of the motor body 17. This allows the air path wind speed to flexibly adapt to the heat dissipation requirements of the motor body 17 under different loads. The synchronized wind speed adjustment of the two ensures that the rate of heat carrying by the primary air and the heat dissipation by the secondary air are accurately matched, avoiding heat exchange efficiency loss caused by air path wind speed imbalance. This significantly improves the heat dissipation stability and controllability, and adapts to the efficient and stable heat dissipation requirements of high power density motors.

[0046] Example 3 See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Based on Embodiment 1 and Embodiment 2, in this embodiment, the gravity heat pipe group 9 consists of four rows of gravity heat pipes 11 arranged in an alternating pattern, and the distance between the gravity heat pipes 11 is greater than the distance between several cooling pipes 5.

[0047] The cooling zone 4 is divided into a left heat exchange zone 26, a middle heat exchange zone 27 and a right heat exchange zone 28. The motor air outlet 29 of the motor body 17 is connected to the middle heat exchange zone 27. The first air inlet 30 and the second air inlet 31 are respectively provided on the side walls at both ends of the motor body 17. The first air inlet 30 and the second air inlet 31 are respectively connected to the left heat exchange zone 26 and the right heat exchange zone 28. A first baffle plate 32 and a second baffle plate 33 are provided between the left heat exchange zone 26, the middle heat exchange zone 27 and the right heat exchange zone 28, and the tops of the first baffle plate 32 and the second baffle plate 33 are interconnected.

[0048] The primary air path enters the central heat exchange zone 27 through the motor outlet 29 of the motor body 17. It first contacts the heat exchange tube to achieve heat exchange. The primary air path with reduced temperature moves to both sides and crosses the first baffle 32 and the second baffle 33 respectively. During this process, it continues to exchange heat with the welding heat pipe. The primary air path with reduced temperature falls to the left heat exchange zone 26 and the right heat exchange zone 28 on both sides and exchanges heat with the welding heat pipe again. Finally, the primary air path with continuous cooling enters the interior of the motor body 17 through the first air inlet 30 and the second air inlet 31, completing the circulation of the primary air path.

[0049] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The principle of an air cooler using gravity heat pipes and the motor using this cooler: 1. Structural Adaptation Principle: The bottom of the cooler shell 1 is directly connected to the motor body 17. The motor air inlet 22 and the motor air outlet 23 are respectively connected to the second air inlet zone 7 and the first air inlet zone 6 of the cooler. At the same time, the cooler is divided into a secondary air inlet zone and a cooling zone 4 by a sealing baffle 2 and a partition plate 35. This avoids the mixing of primary air (motor internal circulation air) and secondary air (atmospheric air) and ensures that the two types of air paths are accurately convection in the cooler, laying a structural foundation for heat exchange. In addition, the top skylight 8 of the cooler can be detached to install the gravity heat pipe group 9 without modifying the main structure of the motor, which has strong adaptability.

[0050] 2. Air circulation principle: The primary air is driven by the power source inside the motor body 17 and circulates along the "motor interior (cooling stator 20, rotor 21), motor air outlet 23, cooler first air inlet zone 6, second air inlet zone 7, motor air inlet 22, motor interior", continuously carrying the motor heat into the cooler; the secondary air is driven by the tail end of the motor shaft or an independent fan and flows along the "atmosphere, cooler secondary air inlet zone, cooling pipe 5 (first air inlet zone 6, second air inlet zone 7), atmosphere", completing basic heat exchange with the primary air through the cooling pipe 5. At the same time, when the primary air passes through the upper part of the cooling pipe 5, it exchanges heat again with the heated section 12 of the gravity heat pipe 11, forming a "basic + auxiliary" two-stage cooling.

[0051] 3. Enhanced heat exchange principle: The array arrangement of cooling pipes 5 expands the basic heat exchange area between primary and secondary air. Gravity heat pipes 11 absorb heat from the primary air quickly through the evaporation and condensation circulation of the heat medium inside the pipe and dissipate it to the atmosphere through the external heat release section 13. The staggered arrangement of heat pipes and fin design further improve heat exchange efficiency, ultimately achieving a closed loop of "primary air carrying heat, initial cooling by cooling pipes 5, deep cooling by gravity heat pipes 11, and primary air returning to the motor body 17", thus solving the problem of excessive temperature rise in high power density motors.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air cooler using a gravity heat pipe, characterized in that: Includes a cooler housing (1) connected to the motor; The interior of the cooler housing (1) is divided into a secondary air intake area (3) and a cooling area (4) by a sealing baffle (2). The cooling zone (4) is provided with a number of spaced cooling pipes (5), one end of each cooling pipe (5) penetrates the sealing baffle (2), and the other end of each cooling pipe (5) penetrates the end of the cooler housing (1) away from the sealing baffle (2). The cooling zone (4) is divided into a first air inlet zone (6) and a second air inlet zone (7) by a partition plate (35). The partition plate (35) is vertically welded to the inner bottom surface of the cooler housing (1), and the top of the partition plate (35) is away from the top of the cooler housing (1). The top of the cooler housing (1) is provided with a skylight (8), and a gravity heat pipe assembly (9) is provided inside the skylight (8); the gravity heat pipe assembly (9) is integrated on a steel plate (10), and the steel plate (10) is detachably installed on the top of the cooler housing (1) through the skylight (8); The gravity heat pipe group (9) includes at least one row of gravity heat pipes (11), and the rows of gravity heat pipes (11) are arranged in an alternating manner, and the distance between the gravity heat pipes (11) is greater than the distance between the cooling pipes (5).

2. An air cooler using a gravity heat pipe according to claim 1, characterized in that: The gravity heat pipe (11) includes a heating section (12) and a heat dissipation section (13). The heating section (12) is located inside the cooler shell (1) and corresponds to the space above the cooling pipe (5). The heat dissipation section (13) is located outside the cooler shell (1). The heating section (12) and the heat dissipation section (13) are separated by the steel plate (10). The gravity heat pipe (11) is filled with a heat exchange medium (14). The heat exchange medium (14) achieves heat transfer through evaporation and condensation cycles.

3. An air cooler using a gravity heat pipe according to claim 2, characterized in that: The heating section (12) and the heat dissipation section (13) are respectively provided with a plurality of heat-absorbing fins (15) and heat-dissipating fins (16) in the axial direction.

4. An air cooler using a gravity heat pipe according to claim 1, characterized in that: The gravity heat pipe group (9) has two rows of gravity heat pipes (11), and the adjacent rows of gravity heat pipes (11) are staggered along the length of the cooler shell (1), with the stagger distance being one-half to one times the diameter of a single gravity heat pipe (11).

5. An air cooler using a gravity heat pipe according to claim 2, characterized in that: The heat exchange medium (14) is low-pressure water, and the interior of the gravity heat pipe (11) is a sealed negative pressure environment, and the negative pressure value meets the requirement that low-pressure water boils and evaporates at a temperature of 70℃±5℃.

6. An air cooler using a gravity heat pipe according to claim 1, characterized in that: The cooling pipe (5) is a thin-walled metal pipe, and the cooling pipe (5) is arranged in an array inside the cooler housing (1).

7. An air cooler using a gravity heat pipe according to claim 1, characterized in that: A sealing strip is provided between the steel plate (10) and the edge of the skylight (8) of the cooler housing (1). The sealing strip is made of heat-resistant silicone rubber.

8. An electric motor using the cooler, comprising the air cooler using a gravity heat pipe as described in any one of claims 1-7, characterized in that: The bottom of the cooler housing (1) is connected to the motor body (17); The motor body (17) is provided with a primary air path power source (18) inside, and a secondary air path power source (19) is connected to the tail end of the rotating shaft of the motor body (17). The motor body (17) includes a stator (20) and a rotor (21). The motor body (17) has a motor air inlet (22) and a motor air outlet (23) on the side near the cooler housing (1). The motor air inlet (22) and the motor air outlet (23) are respectively connected to the second air inlet area (7) and the first air inlet area (6). The primary air path driven by the primary air path power source (18) circulates within the motor air outlet (23), the first air inlet area (6), the second air inlet area (7), the motor air inlet (22), and the motor body (17); The secondary air path driven by the power source (19) passes through the secondary air path inlet (34), the secondary air path inlet area (3), the cooling pipe (5) in the second inlet area (7), and the cooling pipe (5) in the first inlet area (6) in sequence inside the cooler to complete multi-stage heat exchange.

9. A motor using the cooler according to claim 8, characterized in that: The primary airflow power source (18) is an inner fan (24) coaxial with the rotor (21) of the motor body (17), and the secondary airflow power source (19) is an outer fan (25), which is coaxially connected with the rotor (21) of the motor body (17).

10. A motor using the cooler according to claim 8, characterized in that: The secondary air path driven by the power source (19) is an open air path, and the secondary air path is circulated along the atmosphere, the air inlet of the secondary air path, the air inlet area (3) of the secondary air path, the second air inlet area (7), the first air inlet area (6), the air outlet of the cooler, and the atmosphere.

Images