Micro tubular condenser integrated on automobile hub unit

Abstract

The invention relates to a micro tubular condenser integrated on an automobile hub unit, which comprises a condensation elbow group bent in an arc shape as well as an air accumulation cavity and a liquid accumulation cavity which are respectively connected to two ends of the condensation elbow group, an air inlet pipe is arranged on the air accumulation cavity, and a liquid outlet pipe is arranged on the liquid accumulation cavity; lateral fixing plates are arranged on the two sides of the condensation bent pipe group, the air accumulation cavity and the liquid accumulation cavity are connected together through the lateral fixing plates, a plurality of inter-pipe fixing plates are arranged on the condensation bent pipe group in the length direction of the condensation bent pipe group, fixing holes and ventilation holes are formed in the inter-pipe fixing plates, and condensation bent pipes in the condensation bent pipe group are fixed through the fixing holes. The micro tube type condenser can be integrated in the hub, is small in occupied space, can perform sufficient heat exchange with external cooling air, is high in heat exchange performance, optimizes the utilization of internal space, effectively reduces the weight of the whole vehicle, reserves more space for the layout of other components of the hub motor, and improves the service life of the hub motor. And the hub motor driving system is pushed to advance towards the direction of higher integration level and better performance.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel hub motor heat dissipation, and in particular to a micro-tube condenser integrated in an automobile wheel hub unit. Background Art

[0002] The current mainstream cooling methods (air cooling, water cooling, and oil cooling) all have defects: air cooling has low efficiency, water cooling increases weight, and oil cooling has additional losses, making it difficult to balance efficiency and lightweight.

[0003] To address the heat dissipation issues associated with the in-wheel motor and its electronic control system, an immersion boiling cooling solution using an insulating coolant was proposed. The condenser, as a core component, dissipates heat through forced convection with the external cooling air. Given the compact size of the in-wheel motor, the integrated and miniaturized design of the condenser is key to ensuring the efficient operation of the entire cooling system. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a micro-tube condenser integrated into an automobile wheel hub unit, which can be integrated into the wheel hub, occupies a small space, can fully exchange heat with the external cooling air, and has high heat exchange performance.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: A micro-tube condenser integrated in an automobile wheel hub unit comprises an arc-shaped condensing bend group and an air accumulation chamber and a liquid accumulation chamber respectively connected to the two ends of the condensing bend group, wherein the air accumulation chamber is provided with an air inlet pipe, and the liquid accumulation chamber is provided with a liquid outlet pipe; lateral fixing plates are provided on both sides of the condensing bend group, and the air accumulation chamber and the liquid accumulation chamber are connected together by the lateral fixing plates; a plurality of inter-tube fixing plates are provided on the condensing bend group along its length direction, and the inter-tube fixing plates are provided with fixing holes and air vents, and the condensing bends in the condensing bend group are fixed by the fixing holes.

[0006] As an embodiment of the present invention, the condensing bend pipe group is curved and extended in an arc shape; the central angle of the condensing bend pipe group is 70°-110°.

[0007] As an embodiment of the present invention, the condensing elbow group is formed by a plurality of condensing elbows arranged in a rectangular array.

[0008] As an embodiment of the present invention, the condensation elbow is a circular tube with an outer diameter of 1.0-1.8 mm and a wall thickness of 0.1-0.2 mm; the diameter of the air vent is 0.7-0.9 mm.

[0009] As an embodiment of the present invention, the total number of condensing elbows in the condensing elbow group is 513, 658, 780 or 908.

[0010] As an embodiment of the present invention, ventilation holes are provided on the lateral fixing plate.

[0011] As an embodiment of the present invention, the lateral fixed plate is a fan-shaped plate corresponding to the side of the condensing bent pipe group, the inter-tube fixed plate is arranged along the radial direction of the condensing bent pipe group, and a plurality of first clamping plates are evenly arranged at both ends of the inter-tube fixed plate connected to the lateral fixed plate, and a first clamping groove corresponding to the first clamping plate is opened on the lateral fixed plate; the ventilation hole is arranged between the corresponding positions of the adjacent inter-tube fixed plates on the lateral fixed plate and between the corresponding positions of the inter-tube fixed plates on the lateral fixed plate and the end of the lateral fixed plate, and the ventilation hole is fan-shaped.

[0012] As an embodiment of the present invention, the air accumulation chamber and the liquid accumulation chamber have the same structure, including a second panel arranged on the outside, a third panel arranged on the inside, a first panel connected between the upper and lower ends of the second panel and the third panel, and a lateral fixed plate end connected to the front and rear sides of the second panel and the third panel, the third panel is provided with connection holes corresponding to each condensation bend pipe; a plurality of second clamping plates are evenly arranged at both ends of the third panel connected to the lateral fixed plate, and a second clamping groove corresponding to the second clamping plate is opened on the lateral fixed plate.

[0013] A hub motor heat dissipation system comprises an annular evaporator and the above-mentioned condenser, wherein the annular evaporator is arranged inside the hub motor, and the condenser is arranged at the upper front position outside the hub motor.

[0014] An automobile wheel hub unit comprises an automobile wheel hub, a wheel hub motor, an electronic control chip and the above-mentioned wheel hub motor heat dissipation system.

[0015] The beneficial effects of adopting the above technical solution are: The micro-tube condenser provided by the present invention is designed in the shape of a quarter-circle curved tube. By precisely adapting to the arc-shaped geometric features of the hub motor and the automobile hub, it is integrated with the internal space of the automobile hub, completely breaking the space limitations of traditional condensers. While ensuring that the heat exchange function is not affected, it compresses the space occupied by the condensing device to the extreme by virtue of its curved surface layout that fits the annular evaporator. This miniaturized design lays a solid foundation for the compact design of the hub motor system. It not only optimizes the internal space utilization, but also reduces unnecessary structural redundancy, effectively reducing the weight of the entire vehicle. At the same time, it also leaves more space for the layout of other components of the hub motor, pushing the hub motor drive system towards a higher degree of integration and better performance.

[0016] The lateral fixing plates are designed with ventilation holes to create a hollow structure. This not only ensures rigid fixation of the inter-tube fixing plates, but also creates a lateral flow channel for cooling air. During the operation of the in-wheel motor vehicle, cooling air from the external environment can enter through the vents above the condenser and on the outside of the vehicle's wheel hub, and exit through the vents on the inside of the wheel hub, performing heat exchange. This structure directs the cooling air around the vehicle's wheel hub to directly exchange heat with the outer surface of the condenser elbow. The airflow disturbance effect in the hollowed-out area increases the effective heat exchange area, breaking through the limitation of traditional fixing plates that only provide mechanical fixation, and significantly improving the heat exchange performance of the condenser.

[0017] The inter-tube fixing plate features evenly distributed circular holes with diameters ranging from 0.7-0.9mm. This ensures stable fixation of the condenser elbow while optimizing the cooling air flow path. Compared to traditional fixing plates with fewer holes, this micro-aperture design reduces obstruction to cooling air volume and velocity, enabling more efficient heat exchange between the airflow and the condenser elbow, effectively improving the condenser's heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a structural schematic diagram from another angle of the present invention.

[0020] Figure 3 It is a schematic diagram of the decomposition structure of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the present invention after removing the condensation elbow group.

[0022] Figure 5 It is a structural schematic diagram of the condensing elbow group in the present invention.

[0023] Figure 6 yes Figure 5 A partial enlarged schematic diagram of point A in the middle.

[0024] Figure 7 It is a structural schematic diagram of the air inlet flange and the air accumulation cavity in the present invention.

[0025] Figure 8 yes Figure 7 A partial enlarged schematic diagram of point B in the middle.

[0026] Figure 9 It is a structural schematic diagram of the inter-tube fixing plate in the present invention.

[0027] Figure 10 yes Figure 9 A partial enlarged schematic diagram of point C in the middle.

[0028] Figure 11It is a connection diagram of the annular evaporator and the condenser in the present invention.

[0029] Among them: 1 air accumulation chamber, 2 liquid accumulation chamber, 3 condensation elbow group, 4 lateral fixing plate, 401 first card slot, 402 second card slot, 5 ventilation hole, 6 inter-tube fixing plate, 601 fixing hole, 602 air vent, 603 first card plate, 7 air inlet pipe, 8 air inlet flange, 9 liquid outlet pipe, 10 liquid outlet flange, 11 first panel, 12 second panel, 13 third panel, 1301 connecting hole, 1302 second card plate, 14 hub motor, 15 motor winding, 16 airtight container, 17 coolant, 18 bubble pump, 19 bubble, 20 electronic control chip, 21 steam outlet, 22 liquid return port. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clear, the invention is described clearly and completely below in conjunction with specific embodiments.

[0031] like Figures 1-4 A micro-tube condenser integrated in a car hub unit is shown, which includes an arc-shaped condensing bend group 3 and an air accumulation chamber 1 and a liquid accumulation chamber 2 respectively connected to the two ends of the condensing bend group 3, the air accumulation chamber 1 is provided with an air inlet pipe 7, the liquid accumulation chamber 2 is provided with a liquid outlet pipe 9, the air inlet pipe 7 and the liquid outlet pipe 9 are respectively connected to the steam outlet 21 and the return liquid port 22 of the annular evaporator, the air inlet pipe 7 is provided with an air inlet flange 8, model CF25 flange, the liquid inlet pipe 9 is provided with a liquid outlet flange 10, model CF16 flange; lateral fixing plates 4 are provided on both sides of the condensing bend group 3, the air accumulation chamber 1 and the liquid accumulation chamber 2 are connected together by the lateral fixing plates 4, a plurality of inter-tube fixing plates 6 are provided on the condensing bend group 3 along its length direction (i.e., the arc direction), the inter-tube fixing plates 6 are provided with fixing holes 601 and air vents 602, and the fixing holes 601 are used to fix the condensing bends in the condensing bend group 3.

[0032] The gas accumulation chamber 1 is used to store and buffer the steam discharged from the steam outlet 21 of the annular evaporator before it enters the condensing elbow group 3. The condensing elbow group 3 is used to perform convective heat exchange between the steam inside the condensing elbow group 3 and the outside air, so that the steam in the condensing elbow group 3 undergoes a phase change and becomes condensate that flows back into the annular evaporator. The liquid accumulation chamber 2 is used to store the condensate cooled in the condensing elbow group 3 before it enters the annular evaporator through the liquid return port 22. The lateral fixing plate 4 is used to fix the gas accumulation chamber 1, the liquid accumulation chamber 2, and the inter-tube fixing plate 6 into a whole.

[0033] In this embodiment, three inter-tube fixing plates 6 are provided, which are evenly arranged between the air accumulation chamber 1 and the liquid accumulation chamber 2 to fix the upper part, middle part and lower part of the condensation bend pipe group 3 respectively.

[0034] like Figure 5 and Figure 6 As shown, the condensing elbow group 3 is composed of a plurality of condensing elbows arranged in a rectangular array, and the two ends of the condensing elbows in the condensing elbow group 3 are arranged flush with each other.

[0035] The condensing bend pipe group 3 is curved and extended in an arc shape; the central angle of the condensing bend pipe group 3 is 70°-110°, preferably 90°.

[0036] In this embodiment, the condensation bend is a circular tube with an outer diameter of 1.0-1.8 mm, preferably 1.1 mm, and a wall thickness of 0.1-0.2 mm, preferably 0.1 mm; the diameter of the air vent 602 is 0.7-0.9 mm, preferably 0.8 mm. The total number of condensation bends in the condensation bend group 3 is approximately 513-908, for example, 513, 658, 780 or 908. Preferably, 780. When the total number of condensation bends is 780, a 26*30 rectangular array is adopted, wherein 26 are arranged vertically along the lateral fixing plate 4, and 30 are arranged along the radial direction of the lateral fixing plate 4. The structure of the condensation bend ensures the maximum heat dissipation of the condenser to the outside world.

[0037] like Figures 1-4 As shown, ventilation holes 5 are provided on the lateral fixing plate 4. By providing the ventilation holes 5 to realize a hollow structure design, the function of lateral ventilation can be realized, so that the lateral wind can fully exchange heat with the condensing bend pipe group 3.

[0038] like Figures 1-4 、 Figure 9 and Figure 10 As shown, the lateral fixing plate 4 is a fan-shaped plate corresponding to the side of the condenser bend group 3. The inter-tube fixing plate 6 is arranged along the radial direction of the condenser bend group 3. Multiple first clamping plates 603 are evenly arranged at both ends of the inter-tube fixing plate 6 connected to the lateral fixing plate 4. Multiple first clamping grooves 401 corresponding to the first clamping plates 603 are evenly opened on the lateral fixing plate 4 along the radial direction. The ventilation holes 5 are arranged between the corresponding positions of adjacent inter-tube fixing plates 6 on the lateral fixing plate 4, and between the corresponding positions of the inter-tube fixing plates 6 on the lateral fixing plate 4 and the ends of the lateral fixing plate 4. The ventilation holes 5 are large fan-shaped through holes. Alternatively, the ventilation holes 5 can be multiple evenly distributed small through holes.

[0039] like Figure 7 and Figure 8As shown, the gas accumulation chamber 1 and the liquid accumulation chamber 2 have the same structure, including a second panel 12 disposed on the outside, a third panel 13 disposed on the inside, a first panel 11 connected between the upper and lower ends of the second and third panels 12, 13, and the ends of the lateral fixing plate 4 connected to the front and rear sides of the second and third panels 12, 13. The third panel 13 is provided with connection holes 1301 corresponding to each condensing elbow, and the ends of the condensing elbows are fixedly connected to the connection holes 1301. The ends of the third panel 13 connected to the lateral fixing plate 4 are evenly provided with multiple second clamping plates 1302. The lateral fixing plate 4 is provided with multiple second clamping grooves 402 corresponding to the second clamping plates 1302 along the radial direction to facilitate the installation and positioning of the third panel 13. The connections between the panels in the gas accumulation chamber 1 and the liquid accumulation chamber 2, as well as between the panels and the lateral fixing plate 4, are welded together, so that the gas accumulation chamber 1 and the liquid accumulation chamber 2 are completely enclosed and the condensing elbow group 3 can be connected to the annular evaporator. In order to ensure good overall structural strength and stability of the condenser, the inter-tube fixing plate 6 and the side plate fixing plate 4 are also fixed by welding.

[0040] like Figure 11 As shown, the present invention also provides a hub motor heat dissipation system, which includes an annular evaporator and the micro-tube condenser. The annular evaporator is arranged inside the hub motor 14, and the condenser is arranged at the front and upper position of the outside of the hub motor 14 (that is, the outside of the car wheel hub), where the front refers to the forward direction of the car. Placing the condenser at the oblique upper position in front of the hub motor 14 is conducive to the cooling air entering the condensation elbow group 3 from above and outside the condenser.

[0041] In the hub motor heat dissipation system, solving the heating of high-power motors and the integrated thermal management of motors and electronic control chips are key issues. In the present invention, immersion boiling cooling is adopted for the electronic control chip, which causes it to boil through direct contact with the insulating cooling medium, thereby achieving efficient cooling. However, the space of the car hub is limited, and the heat generated by high-power motors is huge. Traditional condensers are difficult to integrate and have low heat exchange efficiency. The miniaturized design of the condenser has significant advantages. It can accurately adapt to the narrow space of the hub, breaking through the space limitations of traditional condensers and achieving deep integration with the hub motor system. At the same time, by optimizing the structure and layout, the contact area with the outside air can be increased as much as possible within a limited space, which can effectively improve the heat exchange efficiency and provide a better solution to the heat dissipation problem of the hub motor.

[0042] Therefore, to overcome the drawbacks of the condenser's difficulty integrating into the vehicle's wheel hub and its limited heat exchange area with the outside air, the present invention designs a micro-tube condenser with a quarter-circle curved tube shape, perfectly adapting to the arc of the vehicle's wheel hub. This maximizes the length of the condenser's fine tubes to allow for sufficient phase change and increases the heat exchange area with the outside air. The hollowed-out structure of the lateral fixing plate 4 allows the condenser's curved tube group 3 to exchange heat with the lateral wind, and the evenly distributed 0.8mm diameter air holes 602 on the inter-tube fixing plate 6 increase the air volume between the tubes and reduce wind resistance, maximizing the heat exchange between the condenser and the outside air.

[0043] The annular evaporator is an annular, airtight container 16 disposed within the hub motor 14 and used to encapsulate a cooling medium. Coolant 17 is contained in the lower portion of the airtight container 16, and a steam outlet 21 is disposed at the upper portion of the container, as well as a liquid return port 22 at the lower portion. A bubble pump 18 is disposed on the inner wall of the airtight container 16. Due to gravity, the cooling medium 17 is located in the lower half of the container 16. To promote heat transfer in the upper half, the bubble pump 18 is used to transport the cooling medium to the upper portion of the container. The bubble pump 18 utilizes the buoyancy generated by the rising bubbles to transport the cooling medium upward, thereby providing relatively uniform cooling for the entire hub motor 14. An electronic control chip 20 is disposed on the inner wall of the airtight container 16 and is positioned near the cooling medium.

[0044] During operation, the heat generated by the hub motor 14 and the electronic control chip is absorbed by the cooling medium in the annular evaporator, causing the liquid cooling medium to undergo a phase change and evaporate into steam. The steam then enters the gas accumulation chamber 1 through the steam outlet 21, the CF25 flange, and the air inlet pipe 7. Due to the change in pressure, the steam in the gas accumulation chamber 1 enters the condensing elbow group 3. The steam in the group condenses into coolant through convection heat exchange with the external cooling air, enters the liquid accumulation chamber 2, and then flows back into the airtight container 16 through the liquid outlet pipe 9, the liquid outlet flange 10, and the liquid return port 22, thus completing the circulation of the cooling medium.

[0045] It should be noted that the phase change cooling fluid is an insulating cooling fluid, and the insulating fluid Novec 7100 is preferably used as the cooling fluid, but is not limited to electronic fluorinated liquid, and can be selected according to the operating temperature range of the hub motor 14 and the electronic control chip.

[0046] The present invention is used for highly integrated cooling of hub motors. The designed micro-tube condenser makes two-phase flow circulation cooling possible in cooling high-power hub motors 14. Compared with traditional condensers, it can achieve stable cooling of the hub motor 14 when it is running.

[0047] In addition, the present invention also provides an automobile wheel hub unit, which includes an automobile wheel hub, a wheel hub motor 14, an electronic control chip 20 and the wheel hub motor heat dissipation system.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A micro-tube condenser integrated into an automobile wheel hub unit, characterized by: It comprises an arc-shaped condensing bend group (3) and an air accumulation chamber (1) and a liquid accumulation chamber (2) respectively connected to both ends of the condensing bend group (3); the air accumulation chamber (1) is provided with an air inlet pipe (7), and the liquid accumulation chamber (2) is provided with a liquid outlet pipe (9); lateral fixing plates (4) are provided on both sides of the condensing bend group (3), and the air accumulation chamber (1) and the liquid accumulation chamber (2) are connected together through the lateral fixing plates (4); the condensing bend group (3) is provided with a plurality of inter-tube fixing plates (6) along its length direction, and the inter-tube fixing plates (6) are provided with fixing holes (601) and air vents (602), and the condensing bends in the condensing bend group (3) are fixed through the fixing holes (601).

2. The micro-tube condenser integrated into an automobile hub unit according to claim 1, characterized in that: The condensing elbow group (3) is composed of a plurality of condensing elbows arranged in a rectangular array.

3. The micro-tube condenser integrated into an automobile hub unit according to claim 2, characterized in that: The condensing bend pipe group (3) is curved and extended in an arc shape; the center angle of the condensing bend pipe group (3) is 70°-110°.

4. The micro-tube condenser integrated into an automobile hub unit according to claim 3, characterized in that: The condensation elbow is a circular tube with an outer diameter of 1.0-1.8 mm and a wall thickness of 0.1-0.2 mm; the diameter of the air vent (602) is 0.7-0.9 mm.

5. The micro-tube condenser integrated into an automobile hub unit according to claim 4, characterized in that: The total number of condensing bends in the condensing bend group (3) is 513, 658, 780 or 908.

6. The micro-tube condenser integrated into an automobile wheel hub unit according to any one of claims 1 to 5, characterized in that: The lateral fixing plate (4) is provided with ventilation holes (5).

7. The micro-tube condenser integrated into an automobile hub unit according to claim 6, characterized in that: The lateral fixing plate (4) is a fan-shaped plate corresponding to the side of the condensing bend tube group (3); the inter-tube fixing plate (6) is arranged along the radial direction of the condensing bend tube group (3); a plurality of first clamping plates (603) are evenly arranged at both ends of the inter-tube fixing plate (6) connected to the lateral fixing plate (4); and a first clamping groove (401) corresponding to the first clamping plate (603) is opened on the lateral fixing plate (4); the ventilation hole (5) is arranged between the corresponding positions of the adjacent inter-tube fixing plates (6) on the lateral fixing plate (4) and between the corresponding positions of the inter-tube fixing plates (6) on the lateral fixing plate (4) and the end of the lateral fixing plate (4); the ventilation hole (5) is fan-shaped.

8. The micro-tube condenser integrated into an automobile hub unit according to claim 1, characterized in that: The gas accumulation chamber (1) and the liquid accumulation chamber (2) have the same structure, including a second panel (12) arranged on the outside, a third panel (13) arranged on the inside, a first panel (11) connected between the upper and lower ends of the second panel (12) and the third panel (13), and an end of a lateral fixing plate (4) connected to the front and rear sides of the second panel (12) and the third panel (13), wherein the third panel (13) is provided with connection holes (1301) corresponding to each condensation bend pipe; a plurality of second clamping plates (1302) are evenly provided at both ends of the third panel (13) connected to the lateral fixing plate (4), and a second clamping groove (402) corresponding to the second clamping plate (1302) is opened on the lateral fixing plate (4).

9. A hub motor heat dissipation system, characterized by: It comprises an annular evaporator and a condenser according to any one of claims 1 to 8, wherein the annular evaporator is arranged inside the hub motor (14), and the condenser is arranged at the upper front position outside the hub motor (14).

10. An automobile wheel hub unit, characterized in that: It comprises an automobile wheel hub, a wheel hub motor (14), an electronic control chip (20), and the wheel hub motor heat dissipation system according to claim 9.

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