Stepping motor double circulation liquid cooling heat dissipation structure and stepping motor

Abstract

This application relates to the industrial field of stepper motor heat dissipation, and provides a dual-circulation liquid cooling structure for a stepper motor and a stepper motor. The stepper motor includes a stator and a housing. The dual-circulation liquid cooling structure includes a coolant cooling circuit comprising an internal heat-conducting zone, an inlet channel, a return channel, and a gas-liquid mixing chamber. The internal heat-conducting zone is located between the housing and the stator, and is connected to both the inlet channel and the return channel. The gas-liquid mixing chamber is also connected to both the inlet channel and the return channel. A gas-liquid drive device is movably disposed in the gas-liquid mixing chamber. The gas-liquid drive device injects coolant into the inlet channel, and gas enters the gas-liquid mixing chamber. The gas in the gas-liquid mixing chamber is discharged to the external space. The dual-circulation liquid cooling structure for a stepper motor provided by this application can dissipate heat from the stepper motor through liquid cooling while ensuring normal operation.

Description

Technical Field

[0001] This application relates to the field of stepper motor heat dissipation technology, and in particular to a stepper motor dual-circulation liquid cooling structure and a stepper motor. Background Technology

[0002] Stepper motors, as actuators that convert electrical pulse signals into angular or linear displacement, offer advantages such as simple structure, precise control, and no cumulative error, and are widely used in CNC machine tools, 3D printers, industrial robots, automation equipment, and medical devices. With the trend towards miniaturization, high precision, and high load capacity in equipment, the power density of stepper motors is constantly increasing, leading to a sharp increase in heat generated by their stator windings during operation. If this heat cannot be effectively dissipated in a timely manner, the internal temperature of the motor will rise, causing the following problems: increased risk of permanent magnet demagnetization, accelerated aging of winding insulation, decreased positioning accuracy, and attenuation of output torque; in severe cases, it can even cause the motor to burn out. Therefore, an efficient and reliable heat dissipation structure is crucial for the stable operation and lifespan of stepper motors.

[0003] In existing technologies, stepper motor heat dissipation solutions mainly include two methods: air cooling and liquid cooling. Air cooling involves setting heat dissipation fins on the surface of the motor housing and using a fan to force convection to remove heat. It has a simple structure and low cost, but its heat dissipation efficiency is limited and cannot meet the heat dissipation requirements of high-power-density motors. Liquid cooling, on the other hand, involves setting coolant channels between the motor housing and the stator, using coolant circulation to carry heat to an external heat sink for heat exchange. It has the advantages of high heat dissipation efficiency and stable temperature rise control, and is gradually being used in high-performance stepper motors.

[0004] Existing liquid cooling systems for stepper motors typically use a water pump to drive the coolant circulation, with a cooling fan installed outside the coolant circulation loop to aid in heat dissipation. This increases the number of system components, leading to higher manufacturing costs and occupying more installation space. If the entire coolant circulation loop were located inside the stepper motor, the presence of multiple components could cause coolant leaks, and any maintenance required would necessitate the complete disassembly of the motor. Summary of the Invention

[0005] This application provides a dual-cycle liquid cooling structure for stepper motors, which can improve the technical problem that existing liquid cooling systems require additional water pumps and cooling fans, resulting in complex cooling structures and troublesome maintenance.

[0006] In a first aspect, embodiments of this application provide a dual-cycle liquid cooling structure for a stepper motor. The stepper motor includes a stator and a housing, the housing having an installation space, and the stator located inside the installation space. The dual-cycle liquid cooling structure for the stepper motor includes: A coolant cooling circuit includes an internal heat-conducting zone, a liquid inlet channel, a return channel, and a gas-liquid mixing chamber. The internal heat-conducting zone is located between the outer casing and the stator and is enclosed within the stator. Each of the internal heat-conducting zone, the liquid inlet channel, and the return channel has an inlet and an outlet. The inlet of the internal heat-conducting zone is connected to the outlet of the liquid inlet channel, and the outlet of the internal heat-conducting zone is connected to the inlet of the return channel. The gas-liquid mixing chamber has a coolant outlet, a coolant inlet, a gas outlet, and a gas inlet. The inlet of the liquid inlet channel is connected to the coolant outlet, the outlet of the return channel is connected to the coolant inlet, and the gas outlet is connected to the external space. A gas-liquid drive device is provided, wherein the gas-liquid drive device is disposed at one end of the gas-liquid mixing chamber near the return liquid channel, and the power output end of the gas-liquid drive device is movably disposed in the gas-liquid mixing chamber; the gas-liquid drive device is used to push the coolant in the gas-liquid mixing chamber into the liquid inlet channel through the coolant outlet; the gas-liquid drive device is also used to fill the gas-liquid mixing chamber with gas so that the gas can carry the heat in the gas-liquid mixing chamber to the external space when it is discharged to the external space; When the power output end of the gas-liquid drive device moves along the first direction, the power output end of the gas-liquid drive device forces the coolant in the gas-liquid mixing chamber into the liquid inlet channel through the coolant outlet, while external gas enters the gas-liquid mixing chamber through the gas inlet; when the power output end of the gas-liquid drive device moves along the second direction, the gas entering the gas-liquid mixing chamber is discharged to the external space through the gas outlet, so as to carry the heat of the coolant in the gas-liquid mixing chamber to the external space.

[0007] The technical solutions described in this application embodiment have at least the following technical effects: The stepper motor dual-circulation liquid cooling structure provided in this application embodiment features a coolant cooling circuit consisting of an internal heat-conducting zone, a liquid inlet channel, a liquid return channel, and a gas-liquid mixing chamber. This allows the coolant to circulate between the inside and outside of the stepper motor, carrying heat generated inside the motor to the external space, thus facilitating heat dissipation. Furthermore, this application integrates the gas circulation section into the gas-liquid mixing chamber located outside the motor, avoiding the need for additional structures within the internal heat-conducting zone. This reduces the risk of coolant leakage and simplifies maintenance (no disassembly of the motor body is required). The application also incorporates a gas-liquid drive device that simultaneously powers the circulation of both coolant and gas. Compared to common solutions that separately install water pumps and fans, this application effectively reduces production costs and saves installation space. The working process of this application is as follows: When the power output end of the gas-liquid drive device moves along the first direction, the power output end pushes the coolant located on one side of the gas-liquid mixing chamber towards the inlet flow channel, thereby driving the coolant circulation in the entire coolant cooling circuit; simultaneously, external gas enters the gas-liquid mixing chamber through the gas inlet. When the power output end of the gas-liquid drive device moves along the second direction, the gas in the gas-liquid mixing chamber is discharged to the external space through the gas outlet, thereby carrying away the heat carried by the coolant in the gas-liquid mixing chamber to the external space.

[0008] In some embodiments, the gas-liquid drive device includes: The main body of the device is located at one end of the gas-liquid mixing chamber near the return liquid channel. The main body of the device has an active space and at least one mounting hole. The active space is connected to the gas-liquid mixing chamber. The mounting hole is located on the side wall of the main body of the device, and its two ends are respectively connected to the gas-liquid mixing chamber and the active space. A piston is movably and sealed within the active space, with one end of the piston extending into the gas-liquid mixing chamber, thereby isolating the gas-liquid mixing chamber from the active space. At least one first check valve is disposed within the mounting hole. The first check valve allows gas from the active space to enter the gas-liquid mixing chamber, and also prevents coolant from the gas-liquid mixing chamber from entering the active space. A dual-purpose positive and negative pressure air pump is installed at the gas inlet. The dual-purpose positive and negative pressure air pump is used to replenish and draw air into the activity space. The dual-purpose positive and negative pressure air pump is used to replenish the active space with air, thereby increasing the air pressure within the active space and pushing the piston to move along the first direction. This forces the coolant in the gas-liquid mixing chamber into the inlet channel through the coolant outlet. Simultaneously, the first one-way valve introduces a portion of the gas in the active space into the gas-liquid mixing chamber. The dual-purpose positive and negative pressure air pump is also used to draw air into the active space, thereby reducing the air pressure within the active space. This causes the piston to move along the second direction, allowing the gas in the gas-liquid mixing chamber located between the piston and the device body to enter the space between the piston and the gas outlet. This allows the gas between the piston and the gas outlet to enter the external space through the gas outlet.

[0009] In some embodiments, the gas-liquid drive device further includes a filter device disposed between the positive and negative pressure dual-purpose air pump and the gas inlet to prevent impurities from entering the active space.

[0010] In some embodiments, the piston is provided with at least one through hole, and the gas-liquid drive device further includes at least one second one-way valve, which is disposed in the through hole and allows the coolant between the piston and the device body to enter the gas-liquid mixing chamber located between the piston and the gas outlet.

[0011] In some embodiments, a drain hole and a gas communication hole are provided on the bottom wall of the main body of the device. One end of the drain hole and the gas communication hole are connected to the active space, and the other end of the gas communication hole is connected to the gas inlet. The gas-liquid drive device also includes a sealing plug and a connecting member. The sealing plug is detachably disposed in the drain hole. The connecting member has a communication space. The connecting member is disposed on the inner bottom wall of the main body of the device, and the communication space is connected to the gas communication hole.

[0012] In some embodiments, the stepper motor dual-circulation liquid cooling structure further includes: An information collection device, comprising a temperature sensor and a distance sensor, wherein the temperature sensor is disposed within the internal heat-conducting area, and the distance sensor is disposed on the connecting member; and A control unit, which is electrically connected to the temperature sensor, the distance sensor and the dual-purpose positive and negative pressure air pump; The control unit is used to control the positive and negative pressure dual-purpose air pump to not work when the temperature sensor detects that the temperature of the internal heat conduction zone is lower than the preset temperature; the control unit is also used to control the positive and negative pressure dual-purpose air pump to work when the temperature sensor detects that the temperature of the internal heat conduction zone is higher than the preset temperature, and to control the positive and negative pressure dual-purpose air pump to perform air replenishment or air intake operations according to the distance sensor.

[0013] In some embodiments, the stepper motor dual-cycle liquid cooling structure further includes a third one-way valve, which is disposed at the connection between the liquid inlet channel and the gas-liquid mixing chamber to prevent the coolant in the liquid inlet channel from moving toward the gas-liquid mixing chamber when the power output end of the gas-liquid drive device moves in the second direction.

[0014] In some embodiments, the coolant cooling circuit further includes a gas-liquid separation membrane disposed at the gas outlet to prevent the coolant in the gas-liquid mixing chamber from entering the external space through the gas outlet.

[0015] In some embodiments, the coolant is an electrically insulating liquid, which is at least one of transformer oil, fluorinated liquid, or synthetic ester oil.

[0016] Secondly, embodiments of this application provide a stepper motor, wherein the heat dissipation structure of the stepper motor includes the stepper motor dual-circulation liquid cooling heat dissipation structure as described in any one of claims 1 to 9. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the dual-cycle liquid cooling heat dissipation structure for the stepper motor and a three-dimensional structure of the stepper motor provided in the embodiments of this application; Figure 2 This is a schematic diagram of the dual-cycle liquid cooling structure for a stepper motor and a cross-sectional view of the stepper motor provided in the embodiments of this application. Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0019] The following are the labeling elements in the figure: 100. Stepper motor dual-circulation liquid cooling heat dissipation structure; 10. Coolant cooling circuit; 101. Internal heat conduction zone; 102. Inlet channel; 103. Return channel; 104. Gas-liquid mixing chamber; 1040. Coolant outlet; 1041. Coolant inlet; 1042. Gas outlet; 1043. Gas inlet; 20. Gas-liquid drive device; 21. Device body; 210. Working space; 213. Gas communication port; 22. Piston; 23. First one-way valve; 24. Dual-purpose positive and negative pressure air pump; 25. Filter device; 26. Second one-way valve; 27. Sealing plug; 28. Connecting component; 40. Information collection device; 41. Temperature sensor; 42. Distance sensor; 60. Third check valve; 70. Stepper motor; 71. Housing; 72. Stator. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0026] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0027] Stepper motors, as actuators that convert electrical pulse signals into angular or linear displacement, offer advantages such as simple structure, precise control, and no cumulative error, and are widely used in CNC machine tools, 3D printers, industrial robots, automation equipment, and medical devices. With the trend towards miniaturization, high precision, and high load capacity in equipment, the power density of stepper motors is constantly increasing, leading to a sharp increase in heat generated by their stator windings during operation. If this heat cannot be effectively dissipated in a timely manner, the internal temperature of the motor will rise, causing the following problems: increased risk of permanent magnet demagnetization, accelerated aging of winding insulation, decreased positioning accuracy, and attenuation of output torque; in severe cases, it can even cause the motor to burn out. Therefore, an efficient and reliable heat dissipation structure is crucial for the stable operation and lifespan of stepper motors.

[0028] In existing technologies, stepper motor heat dissipation solutions mainly include two methods: air cooling and liquid cooling. Air cooling involves setting heat dissipation fins on the surface of the motor housing and using a fan to force convection to remove heat. It has a simple structure and low cost, but its heat dissipation efficiency is limited and cannot meet the heat dissipation requirements of high-power-density motors. Liquid cooling, on the other hand, involves setting coolant channels between the motor housing and the stator, using coolant circulation to carry heat to an external heat sink for heat exchange. It has the advantages of high heat dissipation efficiency and stable temperature rise control, and is gradually being used in high-performance stepper motors.

[0029] First, existing stepper motor liquid cooling systems typically use a water pump to drive the coolant circulation, with a cooling fan installed outside the coolant circulation loop to aid in heat dissipation. This increases the number of system parts, leading to higher manufacturing costs and occupying more installation space. Finally, if the entire coolant circulation loop is located inside the stepper motor, the presence of multiple components in the loop could cause coolant leaks. Furthermore, any maintenance of the coolant cooling system would require disassembling the entire motor.

[0030] Based on this, in order to improve the problem that existing liquid cooling systems require additional water pumps and cooling fans, which leads to complex heat dissipation structures and troublesome maintenance, the embodiments of this application provide the following solutions.

[0031] Please refer to the following: Figures 1 to 3 This application provides a dual-circulation liquid cooling structure 100 for a stepper motor. The stepper motor 70 includes a stator 72 and a housing 71. The housing 71 has an installation space, and the stator 72 is located inside the installation space. The dual-circulation liquid cooling structure includes a coolant cooling circuit 10 and a gas-liquid drive device 20, wherein: The coolant cooling circuit 10 includes an internal heat-conducting zone 101, a liquid inlet channel 102, a return channel 103, and a gas-liquid mixing chamber 104. The internal heat-conducting zone 101 is located between the outer shell 71 and the stator 72 and is wrapped around the stator 72. The internal heat-conducting zone 101, the liquid inlet channel 102, and the return channel 103 each have an inlet and an outlet. The inlet of the internal heat-conducting zone 101 is connected to the outlet of the liquid inlet channel 102, and the outlet of the internal heat-conducting zone 101 is connected to the inlet of the return channel 103. The gas-liquid mixing chamber 104 has a coolant outlet 1040, a coolant inlet 1041, a gas outlet 1042, and a gas inlet 1043. The inlet of the liquid inlet channel 102 is connected to the coolant outlet 1040, the outlet of the return channel 103 is connected to the coolant inlet 1041, and the gas outlet 1042 is connected to the external space.

[0032] The gas-liquid drive device 20 is disposed at one end of the gas-liquid mixing chamber 104 near the return liquid channel 103, and the power output end of the gas-liquid drive device 20 is movably disposed in the gas-liquid mixing chamber 104. The gas-liquid drive device 20 is used to push the coolant in the gas-liquid mixing chamber 104 into the liquid inlet channel 102 through the coolant outlet 1040. The gas-liquid drive device 20 is also used to fill the gas-liquid mixing chamber 104 with gas so that the gas can carry the heat in the gas-liquid mixing chamber 104 to the external space when it is discharged to the external space.

[0033] When the power output end of the gas-liquid drive device 20 moves along the first direction, the power output end of the gas-liquid drive device 20 forces the coolant in the gas-liquid mixing chamber 104 into the liquid inlet channel 102 through the coolant outlet 1040, while external gas enters the gas-liquid mixing chamber 104 through the gas inlet 1043. When the power output end of the gas-liquid drive device 20 moves along the second direction, the gas entering the gas-liquid mixing chamber 104 is discharged to the external space through the gas outlet 1042, so as to carry the heat of the coolant in the gas-liquid mixing chamber 104 to the external space.

[0034] It is understood that the internal heat-conducting zone 101 is a component used to absorb the heat generated by the stator 72; for example, the internal heat-conducting zone 101 can be a tubular copper shell or a tubular aluminum alloy shell, etc. The liquid inlet channel 102 is a component used to guide the cooled liquid into the internal heat-conducting zone 101; for example, the liquid inlet channel 102 can be a metal pipe or a plastic pipe, etc. The liquid return channel 103 is a component used to guide the cooled liquid after heat absorption into the gas-liquid mixing chamber 104; for example, the liquid return channel 103 can be a metal pipe or a plastic pipe, etc. The gas-liquid mixing chamber 104 is a region used for mixing gas and coolant and carrying away heat from the mixture; for example, the gas-liquid mixing chamber 104 can be a metal pipe or a plastic pipe, etc. The gas-liquid drive device 20 is a device for providing power for coolant circulation and for injecting gas into the gas-liquid mixing chamber 104; for example, the gas-liquid drive device 20 includes a device body 21, a piston 22, a first one-way valve 23, a dual-purpose positive and negative pressure air pump 24, a filter device 25, a second one-way valve 26, a sealing plug 27, and a connecting member 28, etc. The first direction is from the gas-liquid mixing chamber 104 near the return channel 103 towards the gas-liquid mixing chamber 104 near the inlet channel 102. The second direction is from the gas-liquid mixing chamber 104 near the inlet channel 102 towards the gas-liquid mixing chamber 104 near the return channel 103.

[0035] As can be seen from the above, the stepper motor dual-circulation liquid cooling structure 100 provided in this application embodiment, by setting a coolant cooling circuit 10 composed of an internal heat-conducting zone 101, a liquid inlet channel 102, a return liquid channel 103, and a gas-liquid mixing chamber 104, allows the coolant to circulate between the inside and outside of the stepper motor 70, thereby carrying the heat generated inside the stepper motor 70 to the external space of the motor, thus facilitating the heat to enter the external space. Furthermore, this application integrates the gas circulation part into the gas-liquid mixing chamber 104 located outside the motor, avoiding the need for additional structures in the internal heat-conducting zone 101, thereby reducing the risk of coolant leakage and simplifying maintenance operations (without disassembling the motor body). This application also provides a gas-liquid drive device 20, which simultaneously powers the circulation of coolant and gas. Compared with the common solution of separately setting water pumps and fans, this application effectively reduces production costs and saves installation space. The working process of this application is as follows: When the power output end of the gas-liquid drive device 20 moves along the first direction, the power output end pushes the coolant located on one side of the gas-liquid mixing chamber 104 towards the liquid inlet channel 102, thereby driving the coolant circulation in the entire coolant cooling circuit 10; at the same time, external gas enters the gas-liquid mixing chamber 104 through the gas inlet 1043. When the power output end of the gas-liquid drive device 20 moves along the second direction, the gas in the gas-liquid mixing chamber 104 is discharged to the external space through the gas outlet 1042, thereby carrying away the heat carried by the coolant in the gas-liquid mixing chamber 104 to the external space.

[0036] In some embodiments, please refer to the following: Figures 1 to 3 The pneumatic-hydraulic drive device 20 includes a device body 21, a piston 22, at least one first check valve 23, and a dual-purpose positive and negative pressure air pump 24, wherein: The main body 21 of the device is located at one end of the gas-liquid mixing chamber 104 near the return liquid channel 103. The main body 21 of the device has an active space 210 and at least one mounting hole. The active space 210 is connected to the gas-liquid mixing chamber 104. The mounting hole is located on the side wall of the main body 21 of the device, and its two ends are connected to the gas-liquid mixing chamber 104 and the active space 210, respectively.

[0037] The piston 22 is movably and sealed within the active space 210, and one end of the piston 22 extends into the gas-liquid mixing chamber 104, thereby isolating the gas-liquid mixing chamber 104 from the active space 210.

[0038] At least one first check valve 23 is disposed in the mounting hole. The first check valve 23 is used to allow gas in the active space 210 to enter the gas-liquid mixing chamber 104. The first check valve 23 is also used to prevent coolant in the gas-liquid mixing chamber 104 from entering the active space 210.

[0039] A dual-purpose positive and negative pressure air pump 24 is installed at the gas inlet 1043. The dual-purpose positive and negative pressure air pump 24 is used to replenish and draw air into the activity space 210.

[0040] The dual-purpose positive and negative pressure air pump 24 is used to replenish the active space 210 with air, thereby increasing the air pressure in the active space 210 and pushing the piston 22 to move along the first direction. This forces the coolant in the gas-liquid mixing chamber 104 into the liquid inlet channel 102 through the coolant outlet 1040. At the same time, the first one-way valve 23 introduces part of the gas in the active space 210 into the gas-liquid mixing chamber 104. The dual-purpose positive and negative pressure air pump 24 is also used to draw air into the active space 210 to reduce the air pressure in the active space 210. This causes the piston 22 to move along the second direction. At the same time, the gas in the gas-liquid mixing chamber 104 located between the piston 22 and the device body 21 can enter between the piston 22 and the gas outlet 1042, thereby allowing the gas between the piston 22 and the gas outlet 1042 to enter the external space through the gas outlet 1042.

[0041] It is understood that the main body 21 is the primary component for assembling the gas-liquid drive device 20; for example, the main body 21 can be a metal cylinder. The piston 22 is a component for providing circulating power to the coolant; for example, the piston 22 includes a first piston section 22 and a second piston section 22. The first piston section 22 is sealed within the active space 210, and a portion of the first piston section 22 extends into the gas-liquid mixing chamber 104. A portion of the first piston section 22 within the gas-liquid mixing chamber 104 is connected to the second piston section 22. The first one-way valve 23 is a component that allows gas to enter the gas-liquid mixing chamber 104 and prevents coolant from entering the active space 210. The dual-purpose positive and negative pressure air pump 24 is a component for both charging and suction operations into the active space 210. The speed at which the dual-purpose positive and negative pressure air pump 24 replenishes air into the active space 210 is greater than the speed at which the first one-way valve 23 replenishes air into the gas-liquid mixing chamber 104.

[0042] With this configuration, the dual-purpose positive and negative pressure air pump 24 injects cold air into the active space 210, increasing the air pressure inside the active space 210. This pushes the piston 22 to move along the first direction, causing the coolant in the coolant cooling circuit 10 to circulate. Simultaneously, some of the gas in the active space 210 enters the coolant in the gas-liquid mixing chamber 104 below the piston 22 through the first one-way valve 23, allowing the cold air to come into contact with the hot coolant and remove the heat from the coolant. The dual-purpose positive and negative pressure air pump 24 draws air from the active space 210 to reduce the pressure inside the active space 210. This causes the piston 22 to move along the second direction under the combined action of the coolant pressure in the gas-liquid mixing chamber 104 and the negative pressure in the active space 210. This allows the coolant and gas below the piston 22 to enter above the piston 22, and the gas is directly discharged from the gas outlet 1042 to the external space, ultimately carrying the heat from the coolant to the external space. The device described above serves as both a power unit for coolant circulation and a gas injection device, simplifying the dual-circulation liquid-cooled heat dissipation structure 100 for the stepper motor and reducing production costs. Furthermore, the solution achieves dual-circulation mechanical linkage: each reciprocating motion of the piston 22 synchronously completes both liquid-cooled and gas-cooled circulations, eliminating the need for additional control system coordination, avoiding timing mismatch issues, and improving heat dissipation efficiency. In addition, the first one-way valve 23 in this solution allows gas to enter the gas-liquid mixing chamber 104 while preventing coolant backflow into the active space 210, ensuring the long-term operational reliability of the air pump and piston 22.

[0043] Optionally, in some embodiments, please refer to Figures 1 to 3 The gas-liquid drive device 20 also includes a filter device 25, which is located between the positive and negative pressure dual-purpose air pump 24 and the gas inlet 1043 to prevent impurities from entering the active space 210.

[0044] It is understood that the filter device 25 is a device for filtering the gas entering the activity space 210; for example, the filter device 25 may be a synthetic fiber filter paper or a sintered stainless steel (316L) filter element, etc.

[0045] With this configuration, this application provides a filter device 25 between the dual-purpose positive and negative pressure air pump 24 and the gas inlet 1043 to prevent small solid particles in the air from entering the active space 210, thereby preventing them from entering the first one-way valve 23 and the coolant. Specifically, if solid particles enter the first one-way valve 23, it may cause the first one-way valve 23 to jam and fail; if solid particles enter the active space 210, it may aggravate the wear between the piston 22 and the device body 21.

[0046] Optionally, please refer to Figures 1 to 3The piston 22 has at least one connecting hole. The gas-liquid drive device 20 also includes at least one second check valve 26. The second check valve 26 is disposed in the connecting hole. The second check valve 26 allows the coolant between the piston 22 and the device body 21 to enter the gas-liquid mixing chamber 104 located between the piston 22 and the gas outlet 1042.

[0047] It is understood that the second one-way valve 26 is a component used to guide the coolant and gas below the piston 22 into the area above the piston 22.

[0048] With this configuration, by opening a connecting hole on the piston 22 and installing a second one-way valve 26 within the connecting hole, the coolant located between the piston 22 and the device body 21 (i.e., the low-temperature coolant cooled by the gas-liquid mixing chamber 104) can enter the gas-liquid mixing chamber 104 between the piston 22 and the gas outlet 1042 through the connecting hole and the second one-way valve 26 when the piston 22 moves in the first direction, preparing for the next liquid cooling cycle. When the piston 22 moves in the second direction, the second one-way valve 26 can prevent the coolant from flowing back between the piston 22 and the device body 21. Through this structure, the present application effectively avoids thermal mixing between the cooled low-temperature coolant and the high-temperature coolant to be cooled, thereby maintaining the thermal stratification effect of the coolant in the gas-liquid mixing chamber 104, ensuring that the coolant entering the internal heat conduction zone 101 each time is the coolant with the lowest temperature, significantly improving the overall heat dissipation efficiency of the system. At the same time, this structure makes full use of the reciprocating motion of the piston 22, requiring no additional drive components, resulting in a compact structure and low cost.

[0049] For example, please refer to Figures 1 to 3 The bottom wall of the main body 21 of the device is provided with a drain hole and a gas communication hole 213. One end of the drain hole and the gas communication hole 213 are connected to the active space 210, and the other end is connected to the gas inlet 1043. The gas-liquid drive device 20 also includes a sealing plug 27 and a connecting member 28. The sealing plug 27 is detachably installed in the drain hole. The connecting member 28 has a communication space. The connecting member 28 is installed on the inner bottom wall of the main body 21 of the device, and the communication space is connected to the gas communication hole 213.

[0050] It is understood that the sealing plug 27 is a component used to block the drain hole; for example, the sealing plug 27 can be a rubber plug or a plastic plug, etc. The connecting member 28 is a component used to improve the connection between the external space and the active space 210; for example, the connecting member 28 can be a metal tube or a plastic tube, etc.

[0051] With this configuration, by opening a drain hole on the bottom wall of the main body 21 and installing a removable sealing plug 27, this application allows maintenance personnel to drain the accumulated liquid by removing the sealing plug 27 when the first one-way valve 23 experiences a minor leak due to long-term operation, causing coolant to enter the active space 210. This eliminates the need to disassemble the entire gas-liquid drive device 20, significantly improving the maintainability of the system. Simultaneously, this application also creates an independent gas passage within the active space 210 by opening a gas communication hole 213 and installing a connecting member 28. Even if liquid accumulates at the bottom of the active space 210, gas can still enter and exit the active space 210 through the communication space of the connecting member 28, ensuring that the positive and negative pressure dual-purpose air pump 24 can normally perform gas replenishment and suction operations, maintaining the reciprocating motion of the piston 22, thereby ensuring the normal operation of the dual-circulation cooling system in the event of liquid leakage.

[0052] In some embodiments, please refer to Figures 1 to 3 The stepper motor dual-cycle liquid cooling structure 100 also includes: Information collection device 40, including temperature sensor 41 and distance sensor 42, wherein temperature sensor 41 is disposed within internal heat-conducting zone 101, and distance sensor 42 is disposed on connecting member 28; and The control unit is electrically connected to the temperature sensor 41, the distance sensor 42, and the dual-purpose positive and negative pressure air pump 24. The control unit is used to control the positive and negative pressure dual-purpose air pump 24 to not work when the temperature sensor 41 detects that the temperature of the internal heat conduction zone 101 is lower than the preset temperature; the control unit is also used to control the positive and negative pressure dual-purpose air pump 24 to work when the temperature sensor 41 detects that the temperature of the internal heat conduction zone 101 is higher than the preset temperature, and to control the positive and negative pressure dual-purpose air pump 24 to perform air replenishment or air intake operations according to the distance sensor 42.

[0053] It is understood that temperature sensor 41 is a device used to detect the temperature of the internal heat-conducting zone 101. Distance sensor 42 is a device used to detect the distance between the connecting member 28 and the piston 22. The control unit is a component used to control the positive and negative pressure dual-purpose air pump 24 based on the temperature detected by temperature sensor 41 and the distance detected by distance sensor 42; for example, the control unit can be a microcontroller or a PLC (programmable logic controller), etc.

[0054] With this configuration, by setting up the control unit, temperature sensor 41 and distance sensor 42, the stepper motor dual-circulation liquid cooling structure 100 can only operate when the internal temperature of the stepper motor 70 is too high, thereby saving the operating time of the stepper motor dual-circulation liquid cooling structure 100.

[0055] Optionally, in some embodiments, please refer to Figures 1 to 3The stepper motor dual-circulation liquid cooling structure 100 also includes a third one-way valve 60, which is located at the connection between the liquid inlet channel 102 and the gas-liquid mixing chamber 104 to prevent the coolant in the liquid inlet channel 102 from moving towards the gas-liquid mixing chamber 104 when the power output end of the gas-liquid drive device 20 moves in the second direction.

[0056] It is understood that the third check valve 60 is a component used to prevent the coolant in the coolant cooling circuit 10 from flowing back.

[0057] With this configuration, this application achieves precise control of the coolant flow direction by installing a third one-way valve 60 at the connection between the inlet channel 102 and the gas-liquid mixing chamber 104. When the power output end of the gas-liquid drive device 20 moves along the first direction, the third one-way valve 60 opens, allowing the cooled coolant in the gas-liquid mixing chamber 104 to enter the inlet channel 102; when the power output end moves along the second direction, the third one-way valve 60 closes, preventing the coolant in the inlet channel 102 from flowing back into the gas-liquid mixing chamber 104. Through the above structure, this application effectively avoids thermal mixing between the low-temperature coolant in the inlet channel 102 and the high-temperature coolant to be cooled in the gas-liquid mixing chamber 104, thereby maintaining the thermal stratification effect of the coolant and ensuring that the coolant entering the internal heat conduction zone 101 each time is the coolant with the lowest temperature, significantly improving the overall heat dissipation efficiency of the system.

[0058] Optionally, please refer to Figures 1 to 3 The coolant cooling circuit 10 also includes a gas-liquid separation membrane disposed at the gas outlet 1042 to prevent the coolant in the gas-liquid mixing chamber 104 from entering the external space through the gas outlet 1042.

[0059] It can be understood that the gas-liquid separation membrane is a component used to prevent the coolant in the gas-liquid mixing chamber 104 from entering the external space through the gas outlet 1042; for example, the gas-liquid separation membrane can be a sintered polyethylene membrane, a sintered polypropylene membrane, or a polytetrafluoroethylene composite membrane, etc.

[0060] In some embodiments, please refer to Figures 1 to 3 The coolant is an electrically insulating liquid, which is at least one of transformer oil, fluorinated liquid, or synthetic ester oil.

[0061] This configuration, by making the coolant an electrically insulating liquid, ensures that even if there is an accidental leak during coolant circulation, it will not cause a short circuit risk to the stator 72 of the stepper motor 70, electrical connectors, or other live components, thereby improving the safety and reliability of the system.

[0062] Please see Figures 1 to 3This application also provides a stepper motor 70, the heat dissipation structure of which includes the stepper motor dual-circulation liquid cooling heat dissipation structure 100 of any of the above embodiments.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-cycle liquid cooling heat dissipation structure for a stepper motor, characterized in that, The stepper motor includes a stator and a housing, the housing having an installation space, and the stator located inside the installation space. The stepper motor's dual-cycle liquid cooling structure includes: A coolant cooling circuit includes an internal heat-conducting zone, a liquid inlet channel, a return channel, and a gas-liquid mixing chamber. The internal heat-conducting zone is located between the outer casing and the stator and is enclosed within the stator. Each of the internal heat-conducting zone, the liquid inlet channel, and the return channel has an inlet and an outlet. The inlet of the internal heat-conducting zone is connected to the outlet of the liquid inlet channel, and the outlet of the internal heat-conducting zone is connected to the inlet of the return channel. The gas-liquid mixing chamber has a coolant outlet, a coolant inlet, a gas outlet, and a gas inlet. The inlet of the liquid inlet channel is connected to the coolant outlet, the outlet of the return channel is connected to the coolant inlet, and the gas outlet is connected to the external space. A gas-liquid drive device is provided, wherein the gas-liquid drive device is disposed at one end of the gas-liquid mixing chamber near the return liquid channel, and the power output end of the gas-liquid drive device is movably disposed in the gas-liquid mixing chamber; the gas-liquid drive device is used to push the coolant in the gas-liquid mixing chamber into the liquid inlet channel through the coolant outlet; the gas-liquid drive device is also used to fill the gas-liquid mixing chamber with gas so that the gas can carry the heat in the gas-liquid mixing chamber to the external space when it is discharged to the external space; When the power output end of the gas-liquid drive device moves along the first direction, the power output end of the gas-liquid drive device forces the coolant in the gas-liquid mixing chamber into the liquid inlet channel through the coolant outlet, while external gas enters the gas-liquid mixing chamber through the gas inlet; when the power output end of the gas-liquid drive device moves along the second direction, the gas entering the gas-liquid mixing chamber is discharged to the external space through the gas outlet, so as to carry the heat of the coolant in the gas-liquid mixing chamber to the external space.

2. The stepper motor dual-circulation liquid cooling structure as described in claim 1, characterized in that, The gas-liquid drive device includes: The main body of the device is located at one end of the gas-liquid mixing chamber near the return liquid channel. The main body of the device has an active space and at least one mounting hole. The active space is connected to the gas-liquid mixing chamber. The mounting hole is located on the side wall of the main body of the device, and its two ends are respectively connected to the gas-liquid mixing chamber and the active space. A piston is movably and sealed within the active space, with one end of the piston extending into the gas-liquid mixing chamber, thereby isolating the gas-liquid mixing chamber from the active space. At least one first check valve is disposed within the mounting hole. The first check valve allows gas from the active space to enter the gas-liquid mixing chamber, and also prevents coolant from the gas-liquid mixing chamber from entering the active space. A dual-purpose positive and negative pressure air pump is installed at the gas inlet. The dual-purpose positive and negative pressure air pump is used to replenish and draw air into the activity space. The dual-purpose positive and negative pressure air pump is used to replenish the active space with air, thereby increasing the air pressure within the active space and pushing the piston to move along the first direction. This forces the coolant in the gas-liquid mixing chamber into the inlet channel through the coolant outlet. Simultaneously, the first one-way valve introduces a portion of the gas in the active space into the gas-liquid mixing chamber. The dual-purpose positive and negative pressure air pump is also used to draw air into the active space, thereby reducing the air pressure within the active space. This causes the piston to move along the second direction, allowing the gas in the gas-liquid mixing chamber located between the piston and the device body to enter the space between the piston and the gas outlet. This allows the gas between the piston and the gas outlet to enter the external space through the gas outlet.

3. The stepper motor dual-cycle liquid cooling structure as described in claim 2, characterized in that: The gas-liquid drive device also includes a filter device, which is disposed between the positive and negative pressure dual-purpose air pump and the gas inlet to prevent impurities from entering the active space.

4. The stepper motor dual-cycle liquid cooling structure as described in claim 2, characterized in that: The piston has at least one through hole, and the gas-liquid drive device further includes at least one second one-way valve. The second one-way valve is disposed in the through hole and allows the coolant between the piston and the device body to enter the gas-liquid mixing chamber located between the piston and the gas outlet.

5. The stepper motor dual-cycle liquid cooling structure as described in claim 2, characterized in that: The bottom wall of the main body of the device is provided with a drain hole and a gas communication hole. One end of the drain hole and the gas communication hole are connected to the active space, and the other end of the gas communication hole are connected to the gas inlet. The gas-liquid drive device also includes a sealing plug and a connecting member. The sealing plug is detachably disposed in the drain hole. The connecting member has a communication space. The connecting member is disposed on the inner bottom wall of the main body of the device, and the communication space is connected to the gas communication hole.

6. The stepper motor dual-circulation liquid cooling structure as described in claim 5, characterized in that, The stepper motor dual-circulation liquid cooling structure also includes: An information collection device, comprising a temperature sensor and a distance sensor, wherein the temperature sensor is disposed within the internal heat-conducting area, and the distance sensor is disposed on the connecting member; and A control unit, which is electrically connected to the temperature sensor, the distance sensor and the dual-purpose positive and negative pressure air pump; The control unit is used to control the positive and negative pressure dual-purpose air pump to not work when the temperature sensor detects that the temperature of the internal heat conduction zone is lower than the preset temperature; the control unit is also used to control the positive and negative pressure dual-purpose air pump to work when the temperature sensor detects that the temperature of the internal heat conduction zone is higher than the preset temperature, and to control the positive and negative pressure dual-purpose air pump to perform air replenishment or air intake operations according to the distance sensor.

7. The stepper motor dual-cycle liquid cooling structure as described in claim 1, characterized in that: The stepper motor dual-cycle liquid cooling structure also includes a third one-way valve, which is located at the connection between the liquid inlet channel and the gas-liquid mixing chamber to prevent the coolant in the liquid inlet channel from moving towards the gas-liquid mixing chamber when the power output end of the gas-liquid drive device moves in the second direction.

8. The stepper motor dual-cycle liquid cooling structure as described in claim 1, characterized in that: The coolant cooling circuit also includes a gas-liquid separation membrane disposed at the gas outlet to prevent the coolant in the gas-liquid mixing chamber from entering the external space through the gas outlet.

9. The stepper motor dual-cycle liquid cooling structure as described in claim 1, characterized in that: The coolant is an electrically insulating liquid, which is at least one of transformer oil, fluorinated liquid, or synthetic ester oil.

10. A stepper motor, characterized in that, The heat dissipation structure of the stepper motor includes the stepper motor dual-circulation liquid cooling structure as described in any one of claims 1 to 9.

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