Variable frequency driver of vehicle-mounted air conditioner compressor
By combining a cooling component with a refrigerant pipe and a heat dissipation pipe, and using a design incorporating a shape memory alloy spring and a thermal expansion metal fin, the problem of poor heat dissipation in the frequency converter driver is solved, achieving efficient temperature control and optimized heat dissipation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-28
- Publication Date
- 2026-03-31
AI Technical Summary
The heat dissipation devices of existing frequency converters are ineffective and cannot effectively reduce the heat of internal power electronic components, leading to overheating of the equipment.
The cooling component uses a combination of refrigerant pipes and heat dissipation pipes to directly cool the inverter motherboard through the refrigerant pipes. It also uses shape memory alloy springs to adjust the contact area between the fins and the refrigerant, and combines the fan blades and swivel system to adjust the airflow. At the same time, it uses thermal expansion metal fins to adjust the position of the heat dissipation pipes and optimize the heat dissipation path.
It improves the cooling efficiency of the inverter motherboard, keeps the equipment operating within a stable temperature range, enhances heat dissipation, and extends the equipment's lifespan.
Smart Images
Figure CN121756848A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of variable frequency drive technology, specifically to a variable frequency drive for a vehicle air conditioning compressor. Background Technology
[0002] A variable frequency drive (VFD) is an electronic controller designed to change the frequency and voltage supplied to an AC motor, thereby achieving precise control of the motor speed. It mainly consists of a rectification (AC to DC), filtering, inversion (DC to AC), braking unit, drive unit, detection unit, and microprocessor unit. It adjusts the output voltage and frequency by switching its internal IGBTs, providing the required power voltage according to the actual needs of the motor, thus achieving energy saving and speed regulation. VFDs are widely used in industrial automation, HVAC water treatment, oil and gas, energy industries, and transportation, among other fields. They not only save energy and improve system efficiency but also improve the working environment, reduce noise levels, decrease mechanical stress in machines, and extend service life. The location of heat generation in a frequency converter is not completely fixed during use. The heat generation of a frequency converter mainly comes from its internal power electronic devices, such as IGBTs or MOSFETs. During different operations, current conversion and regulation, and frequency changes, losses are generated, which are dissipated in the form of heat energy. Existing heat dissipation devices often adopt a fixed installation method, which means that the path of air convection for heat exchange is unchanged, and heat dissipation can only rely on air circulation to cool down the inside of the driver, which is not very effective. Therefore, we propose a variable frequency drive for vehicle air conditioning compressors. Summary of the Invention
[0003] The purpose of this invention is to provide a variable frequency drive for a vehicle air conditioning compressor to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a vehicle air conditioning compressor inverter driver, comprising a compressor, wherein an inverter motor for driving the compressor is fixedly connected to the outer surface of the rear end of the compressor, and a housing is fixedly connected to the upper annular outer surface of the compressor, wherein an inverter main board is provided inside the housing; A cooling component is fixedly connected to the outer surface of the front end of the compressor. The cooling component includes a refrigerant pipe, which is fixedly connected to the output end of the front end of the compressor. The refrigerant pipe passes through the inside of the housing where the inverter motherboard is installed to cool the inverter motherboard. A heat dissipation assembly is connected to the upper outer surface of the box. The heat dissipation assembly includes a heat dissipation pipe that penetrates the box and is aligned with the frequency converter motherboard. A drive motor is fixed inside the heat dissipation pipe. A connector is fixedly connected to the output end of the drive motor. Fan blades are connected to the annular outer surface of the connector.
[0005] The cooling component also includes a cooling box, which is smaller than the box body. The box body is composed of an upper shell and a lower shell. Several sets of heat dissipation pins are fixedly connected to the lower end and the front and rear outer surfaces of the cooling box. The heat dissipation pins lift the cooling box. An installation cavity is opened inside the cooling box. The inverter motherboard is fixedly connected inside the installation cavity. The upper end of the installation cavity is open, and a cover plate is fixedly connected at a position aligned with the opening of the installation cavity. Several sets of heat dissipation pins are also fixedly connected to the upper end of the cover plate. Fins are provided on the left and right outer surfaces of the cooling box.
[0006] Both the fins and the ejector pins are in contact with the inner surface of the box.
[0007] A shrink plate is fixedly connected to the outer surface of the end of the fin away from the box body, and the fin penetrates through the cooling box. The shrink plate matches the cooling box, and a shrink cavity is formed between the shrink plate and the cooling box. A flow groove is opened at the upper end of the inner surface of the cooling box at the position corresponding to the shrink cavity. The flow groove has a U-shaped structure design. A fixed tube is fixedly connected to the outer surface of the end of the flow groove away from the shrink cavity. A telescopic tube is slidably connected inside the fixed tube. A memory alloy spring is fixedly connected between the lower end of the inner surface of the telescopic tube and the cooling box.
[0008] The outer surface of the fins is provided with a through hole at the position where it connects to the shrink plate, and the number of fixed tubes and flow channels is several sets, which are located on both sides of the cooling box.
[0009] The heat dissipation assembly further includes a pipe opening on the outer surface of the upper housing. A pre-reserved groove is formed on the inner surface of the pipe opening. A first insert is slidably connected inside the first pre-reserved groove. The insert is fitted onto the annular outer surface of the heat dissipation pipe. A second insert is fixedly connected to the lower outer surface of the heat dissipation pipe. A first pre-reserved opening is formed on the cover plate corresponding to the second insert. A second pre-reserved groove is formed on the annular inner surface of the first pre-reserved opening. The second insert is located inside the second pre-reserved groove. The diameter of the pipe opening is the same as that of the first pre-reserved opening. A second pre-reserved opening is also formed on the outer surface of the upper housing, communicating with the first pre-reserved groove. A convection pipe is provided inside the second pre-reserved opening. A fourth insert is fitted onto the outer surface of the convection pipe. A third insert is fixedly connected to the lower outer surface of the convection pipe. A third pre-reserved opening is formed on the cover plate corresponding to the third insert, communicating with the second pre-reserved groove. The third insert is located inside the second pre-reserved groove.
[0010] Among them, insert one and insert four are made of thermally expanding metal.
[0011] The inserts two and three are made of thermally expanding metal.
[0012] The lower end of the connecting body has a cavity. A rotating rod is rotatably connected to the inner surface of the cavity via a rotating shaft. The end of the rotating rod away from the connecting body is fixedly connected to the fan blade. The annular outer surface of the rotating rod inside the cavity has a toothed groove. A turntable is rotatably connected to the inner surface of the cavity via a bearing. Teeth are fixedly connected to the turntable at positions corresponding to the toothed groove. A telescopic rod is fixedly connected to the lower outer surface of the turntable. A telescopic sleeve is fitted over the telescopic rod. The telescopic sleeve is fixedly connected to the inner surface of the cavity. A return spring is fixedly connected between the telescopic sleeve and the telescopic rod. Mercury is injected between the telescopic sleeve and the telescopic rod. The number of tooth grooves on the annular outer surface of the rotating rod is several sets, and they surround half a circle of the rotating rod.
[0013] This invention has at least the following beneficial effects: By utilizing the refrigerant generated during the compressor's operation, the refrigerant can be used to cool the inverter mainboard, thereby increasing the cooling effect and maintaining the inverter mainboard at a relatively stable operating temperature. Through the memory alloy spring, the contact area between the fins and the refrigerant can be adjusted after the local heat generation of the inverter mainboard increases, so that more refrigerant can be directed to the side of the inverter mainboard that is severely overheated, thus providing limited cooling to the high-heat area. The fan blades and the rotating rod are connected. When the telescopic sleeve is subjected to a large temperature, the expanding mercury will drive the telescopic rod to rotate the turntable. The rotating turntable drives the toothed rod to rotate through the teeth, thereby changing the windward area of the fan blades. Driven by the drive motor, the air volume is increased, and the heat dissipation effect is further enhanced. Through the expansion metal inserts one and four, the heat dissipation pipe and convection pipe are fixed relative to the surface of the upper shell after being heated and expanded. If the cooling box slides, the position of the heat dissipation pipe relative to the inverter motherboard will change, which can prioritize cooling the side of the inverter motherboard surface that is locally heated, thereby improving the cooling effect. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the refrigerant pipe and compressor of the present invention; Figure 3 This is a schematic diagram of the structure of the box body of the present invention; Figure 4 This is a schematic diagram of the cooling box and the inverter mainboard of the present invention; Figure 5 For the present invention Figure 4Enlarged structural diagram at point A in the middle; Figure 6 This is a cross-sectional structural diagram of the box body of the present invention; Figure 7 This is a schematic diagram of the structure of the heat sink and the insert of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point B; Figure 9 This is a schematic diagram of the convection tube structure of the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point C; Figure 11 This is a schematic diagram of the structure of the heat sink, the insert, and the fan blade of the present invention; Figure 12 This is a schematic diagram of the connecting body and rotating rod of the present invention; Figure 13 For the present invention Figure 12 Enlarged structural diagram at point D; Figure 14 This is a schematic diagram of the telescopic rod and telescopic sleeve of the present invention; Figure 15 This is an exploded structural diagram of the telescopic rod and telescopic sleeve of the present invention.
[0015] In the diagram: 1. Compressor; 11. Inverter main board; 2. Housing; 20. Lower housing; 21. Upper housing; 24. Through hole; 25. Shrink chamber; 26. Shrink plate; 27. Mounting cavity; 28. Flow groove; 29. Fixing pipe; 3. Cooling assembly; 30. Refrigerant pipe; 31. Cooling box; 32. Heat dissipation pin; 33. Fin; 34. Memory alloy spring; 35. Telescopic tube; 36. Cover plate; 4. Heat dissipation assembly; 40. Pipe opening; 41. Insert fin 1; 42. Heat dissipation pipe; 43. Reserved slot one; 44. Reserved slot two; 45. Insert two; 451. Reserved opening one; 46. Convection pipe; 47. Insert three; 471. Reserved opening three; 48. Insert four; 49. Reserved opening two; 50. Drive motor; 51. Connector; 52. Fan blade; 53. Cavity; 54. Rotating rod; 55. Turntable; 56. Gear groove; 57. Tooth; 58. Telescopic rod; 59. Return spring; 60. Telescopic sleeve. Detailed Implementation
[0016] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] Example 1 Please see Figure 1-15 The present invention provides a technical solution: a variable frequency drive for a vehicle air conditioning compressor 1, including a compressor 1, a variable frequency motor for driving the compressor 1 is fixedly connected to the outer surface of the rear end of the compressor 1, a housing 2 is fixedly connected to the upper annular outer surface of the compressor 1, and a variable frequency main board 11 is provided inside the housing 2; A cooling component 3 is fixedly connected to the outer surface of the front end of the compressor 1. The cooling component 3 includes a refrigerant pipe 30, which is fixedly connected to the output end of the front end of the compressor 1. The refrigerant pipe 30 passes through the inside of the housing 2 where the inverter main board 11 is installed to cool the inverter main board 11. The inverter circuit board is cooled by using the refrigerant returning from the compressor 1 to prevent the inverter circuit board from overheating. A heat dissipation assembly 4 is connected to the upper outer surface of the housing 2. The heat dissipation assembly 4 includes a heat dissipation pipe 42, which penetrates the housing 2 and is aligned with the inverter mainboard 11. A drive motor 50 is fixed inside the heat dissipation pipe 42. A connector 51 is fixedly connected to the output end of the drive motor 50. A fan blade 52 is connected to the annular outer surface of the connector 51. The fan blade 52 further enhances the heat dissipation effect on the inverter circuit board, keeping the circuit board within a reasonable temperature range.
[0018] Please see Figure 3-5 The cooling assembly 3 also includes a cooling box 31, which is smaller in volume than the box body 2. The box body 2 is composed of an upper shell 21 and a lower shell 20. Several sets of heat dissipation pins 32 are fixedly connected to the lower end and the front and rear outer surfaces of the cooling box 31. The heat dissipation pins 32 lift the cooling box 31, positioning it near the center of the box body 2. An installation cavity 27 is provided inside the cooling box 31. The inverter main board 11 is fixedly connected inside the installation cavity 27. The upper end of the installation cavity 27 is open, and a cover plate 36 is fixedly connected at a position aligned with the opening of the installation cavity 27. The cover plate is fixedly connected by screws for easy disassembly. Several sets of heat dissipation pins 32 are also fixedly connected to the upper end of the cover plate 36. The left and right outer surfaces of the cooling box 31 are provided with fins 33. The fins 33 and the pins are in contact with the inner surface of the box body 2, which can provide effective support. When the refrigerant inside the refrigerant pipe 30 enters the box body 2, it passes through the gap between the heat dissipation pins 32 and the fins 33, and takes away the temperature of the surface of the cooling box 31. The refrigerant returns to the compressor 1 to complete a cycle, which quickly cools down the cooling box 31 and keeps the inverter main board 11 in a reasonable temperature range. The above structure can cool down the inverter main board 11 more directly and improve the cooling efficiency.
[0019] A shrink plate 26 is fixedly connected to the outer surface of the end of the fin 33 away from the box 2, and the fin 33 penetrates the cooling box 31. The shrink plate 26 matches the cooling box 31, and a shrink cavity 25 is formed between the shrink plate 26 and the cooling box 31. Coolant can be injected into the shrink cavity 25, the flow groove 28, and the fixed tube 29 to absorb heat and make uniform contact with the fin 33, which is conducive to heat transfer. A flow groove 28 is opened at the upper end of the inner surface of the cooling box 31 at the position corresponding to the shrink cavity 25. The flow groove 28 has a U-shaped structure design. A fixed tube 29 is fixedly connected to the outer surface of the end of the flow groove 28 away from the shrink cavity 25. A telescopic tube 35 is slidably connected inside the fixed tube 29. A memory alloy spring 34 is fixedly connected between the lower end of the inner surface of the telescopic tube 35 and the cooling box 31. When the inverter main board 11 is in different Under certain operating conditions, the heat generated by local components increases. The heat is transferred to the surface of the cooling box 31 through the air and absorbed by the coolant. The shape memory alloy spring 34 begins to extend due to heat, thereby pushing the telescopic tube 35 downward. This draws the coolant inside the contraction chamber 25 through the through hole 24 and then through the flow channel into the fixed tube 29 and the telescopic tube 35. This forces the contraction plate 26 to push the fins 33 outward under negative pressure. Since the fins 33 are in contact with the inner wall of the cooling box 31, the fin 33 on the side with the largest heat generation of the inverter resistor board will push the cooling box 31 to slide on the surface of the lower shell 20, squeezing the fins 33 on the other side. This leaves more space inside the box 2 for the fin 33 on the side with the largest heat generation of the inverter main board 11, allowing the fins 33 to come into contact with more refrigerant. This facilitates rapid cooling of the local area of the inverter main board 11, thereby improving the heat dissipation effect.
[0020] A through hole 24 is provided at the position where the outer surface of the fin 33 connects with the shrink plate 26. The through hole 24 facilitates the flow of coolant inside the shrink cavity 25. There are several sets of fixed pipes 29 and flow channels 28, which are located on both sides of the cooling box 31.
[0021] The heat dissipation assembly 4 also includes a pipe opening 40, which is formed on the outer surface of the upper housing 21. A pre-reserved groove 43 is formed on the inner surface of the pipe opening 40. A first insert 41 is slidably connected inside the pre-reserved groove 43. The first insert 41 is sleeved on the annular outer surface of the heat dissipation pipe 42, facilitating disassembly between the upper housing 21 and the lower housing 20. A second insert 45 is fixedly connected to the lower outer surface of the heat dissipation pipe 42. A pre-reserved opening 451 is formed on the cover plate 36 at a position corresponding to the second insert 45. A second pre-reserved groove 44 is formed on the annular inner surface of the pre-reserved opening 451. The second insert 45... Located inside the reserved slot 2 44, the diameter of the pipe opening 40 is the same as that of the reserved opening 1 451. The outer surface of the upper housing 21 also has a reserved opening 2 49, which communicates with the reserved slot 1 43. A convection pipe 46 is provided inside the reserved opening 2 49. A fourth insert 48 is fitted onto the outer surface of the convection pipe 46. A third insert 47 is fixedly connected to the lower outer surface of the convection pipe 46. A reserved opening 3 471 is provided on the cover plate 36 at a position corresponding to the third insert 47. The reserved opening 3 471 communicates with the reserved slot 2 44. The third insert 47 is located inside the reserved slot 2 44. Insert 1 (41) and Insert 4 (48) are made of thermally expanding metal. Since the cooling box 31 is slidable left and right inside the box 2, to avoid interference, the diameter of the pipe opening 40 is larger than the diameter of the heat dissipation pipe 42. The heat dissipation pipe 42 can slide on the surface of the pipe opening 40 via Insert 1 (41) and Insert 2 (45), ensuring that the refrigerant inside the box 2 does not leak out. When the drive motor 50 inside the heat dissipation pipe 42 controls the fan blades 52 to rotate, it draws external air into the cooling box 31, directly cooling the inverter motherboard 11. The air is then discharged through the convection pipe 46, forming effective air convection. The inserts 47 and 48 on the surface of the heat pipe 46 have the same function. Inserts 41 and 48 slide inside the reserved slot 43, and inserts 45 and 47 slide inside the reserved slot 2. When inserts 41 and 48 are thermally expanding metals, they expand after being heated and are squeezed and fixed relative to the reserved slot 43 to fix the heat pipe 42 and the upper shell 21. At this time, the cooling box 31 moves inserts 45 and 47 to slide inside the reserved slot 2, which will change the position of the heat pipe 42, and can directly dissipate heat from the components with large heat generation, thus improving the heat dissipation effect.
[0022] Example 2 The second insert 45 and the third insert 47 are made of thermally expanding metal. Here, thermal expansion refers to metal that expands significantly when heated. In this embodiment, after the second insert 45 and the third insert 47 expand when heated, they will be fixed to the cover plate 36. If the cooling box 31 moves, the heat pipe 42 will remain in the same position as the inverter motherboard 11 and continue to dissipate heat from the original components. The thermally expanding metal can be a cadmium alloy.
[0023] The lower end of the connecting body 51 has a cavity 53. A rotating rod 54 is rotatably connected to the inner surface of the cavity 53 via a rotating shaft. The end of the rotating rod 54 away from the connecting body 51 is fixedly connected to the fan blade 52. A toothed groove 56 is formed on the annular outer surface of the rotating rod 54 inside the cavity 53. A turntable 55 is rotatably connected to the inner surface of the cavity 53 via a bearing. Teeth 57 are fixedly connected to the turntable 55 at positions corresponding to the toothed groove 56. A telescopic rod 58 is fixedly connected to the lower outer surface of the turntable 55. A telescopic sleeve 60 is fitted over the telescopic rod 58 and is fixedly connected to the inner surface of the cavity 53. A return spring 59 is fixedly connected between the telescopic rods 58. Mercury is injected between the telescopic sleeve 60 and the telescopic rods 58. When the temperature released by the inverter main board 11 is high enough, the mercury between the telescopic sleeve 60 and the telescopic rods 58 begins to expand and push the telescopic rods 58 to slide, thereby causing the turntable 55 to rotate. In turn, the tooth groove 56 and tooth 57 drive the rotating rod 54 to rotate, changing the windward area of the blades to achieve the effect of adjustable air volume. The return spring 59 ensures that the telescopic rods 58 can be effectively reset inside the telescopic tube 35. At the same time, the return spring 59 can also be made of shape memory alloy, such as TiNi shape memory alloy or CuZnAl shape memory alloy. The number of grooves 56 on the annular outer surface of the rotating rod 54 is several sets, and they are arranged around the rotating rod 54 in half a circle. The number of grooves 56 is set to limit the maximum rotation angle of the fan blade 52 by half a circle, thereby increasing the stability of the structure.
[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A kind of vehicle-mounted air conditioner compressor variable frequency driver, including compressor (1), the rear end outer surface of the compressor (1) is fixedly connected with the variable frequency motor of driving compressor (1), the upper end annular outer surface of the compressor (1) is fixedly connected with box body (2), it is characterized by: The box (2) is internally provided with a variable frequency mainboard (11); The front end outer surface of the compressor (1) is fixedly connected with a cooling assembly (3), the cooling assembly (3) comprises a refrigerant pipe (30), the refrigerant pipe (30) is fixedly connected with the output end of the front end of the compressor (1), the refrigerant pipe (30) passes through the inside of the box (2) in which the variable frequency mainboard (11) is installed, and the variable frequency mainboard (11) is cooled. The upper end outer surface of the box (2) is connected with a heat dissipation assembly (4), the heat dissipation assembly (4) comprises a heat dissipation pipe (42), the heat dissipation pipe (42) penetrates the box (2) and is aligned with the variable frequency mainboard (11), a driving motor (50) is fixedly arranged in the heat dissipation pipe (42), the output end of the driving motor (50) is fixedly connected with a connecting body (51), and the annular outer surface of the connecting body (51) is connected with a fan blade (52).
2. The inverter drive for an on-board air-conditioning compressor according to claim 1, characterized by: The cooling assembly (3) further comprises a cooling box (31), the volume of the cooling box (31) is smaller than that of the box (2), the box (2) is formed by splicing an upper shell (21) and a lower shell (20), the lower end and the front and rear outer surfaces of the cooling box (31) are fixedly connected with a plurality of groups of heat dissipation needles (32), the heat dissipation needles (32) lift up the cooling box (31), an installation cavity (27) is formed in the inside of the cooling box (31), the variable frequency mainboard (11) is fixedly connected in the installation cavity (27), the upper end of the installation cavity (27) is open, a cover plate (36) is fixedly connected to the position aligned with the opening of the installation cavity (27), the upper end of the cover plate (36) is also fixedly connected with a plurality of groups of heat dissipation needles (32), and the left and right outer surfaces of the cooling box (31) are provided with fins (33).
3. The inverter drive for an on-board air-conditioning compressor according to claim 2, characterized by: The fins (33) and the thimbles are in contact with the inner surfaces of the box (2).
4. The inverter drive for an on-board air conditioner compressor according to claim 3, characterized by: The outer surface of the end of the fin (33) away from the box (2) is fixedly connected with a contraction plate (26), the fin (33) penetrates the cooling box (31), the contraction plate (26) is matched with the cooling box (31), a contraction cavity (25) is formed between the contraction plate (26) and the cooling box (31), a flow-through groove (28) is formed in the inner surface of the upper end of the cooling box (31) and at the position corresponding to the contraction cavity (25), the flow-through groove (28) is designed in a U-shaped structure, the outer surface of the end of the flow-through groove (28) away from the contraction cavity (25) is fixedly connected with a fixed pipe (29), a telescopic pipe (35) is slidably connected in the inside of the fixed pipe (29), and a memory alloy spring (34) is fixedly connected between the inner surface of the lower end of the telescopic pipe (35) and the cooling box (31).
5. The inverter drive for an on-board air conditioner compressor according to claim 4, characterized by: A through hole (24) is formed in the position, where the outer surface of the fin (33) is connected with the contraction plate (26), the number of the fixed pipes (29) and the flow-through grooves (28) is a plurality of groups, and the fixed pipes (29) and the flow-through grooves (28) are respectively located at the two sides of the cooling box (31).
6. The inverter drive for an on-board air conditioner compressor according to claim 2, characterized by: The heat dissipation assembly (4) further comprises a pipe mouth (40) formed on the outer surface of the upper shell (21), an inner surface of the pipe mouth (40) is formed with a reserved groove I (43), the reserved groove I (43) is slidably connected with a first insertion piece (41), the first insertion piece (41) is sleeved on the annular outer surface of a heat dissipation pipe (42), a lower end of the outer surface of the heat dissipation pipe (42) is fixedly connected with a second insertion piece (45), the cover plate (36) is formed with a reserved opening I (451) at a position corresponding to the second insertion piece (45), an annular inner surface of the reserved opening I (451) is formed with a reserved groove II (44), the second insertion piece (45) is located in the reserved groove II (44), the diameter of the pipe mouth (40) is consistent with that of the reserved opening I (451), the outer surface of the upper shell (21) is further formed with a reserved opening II (49), the reserved opening II (49) is communicated with the reserved groove I (43), the reserved opening II (49) is internally provided with a convection pipe (46), an outer surface of the convection pipe (46) is sleeved with a fourth insertion piece (48), a lower end of the outer surface of the convection pipe (46) is fixedly connected with a third insertion piece (47), the cover plate (36) is formed with a reserved opening III (471) at a position corresponding to the third insertion piece (47), the reserved opening III (471) is communicated with the reserved groove II (44), and the third insertion piece (47) is located in the reserved groove II (44).
7. The inverter drive for an on-board air conditioning compressor of claim 6, wherein: The first insertion piece (41) and the fourth insertion piece (48) are made of thermal expansion metal.
8. The inverter drive for an on-board air conditioner compressor according to claim 6, characterized by: The second insertion piece (45) and the third insertion piece (47) are made of thermal expansion metal.
9. The inverter drive for an on-board air conditioner compressor according to claim 2, characterized by: A lower end of the connecting body (51) is formed with a cavity (53), an inner surface of the cavity (53) is rotatably connected with a rotating rod (54) through a rotating shaft, one end of the rotating rod (54) away from the connecting body (51) is fixedly connected with a fan blade (52), an annular outer surface of the rotating rod (54) located in the cavity (53) is formed with a gear slot (56), the inner surface of the cavity (53) is rotatably connected with a rotating disc (55) through a bearing, the rotating disc (55) is fixedly connected with a gear tooth (57) at a position corresponding to the gear slot (56), a lower end of the outer surface of the rotating disc (55) is fixedly connected with an extension rod (58), an outer portion of the extension rod (58) is sleeved with an extension sleeve (60), the extension sleeve (60) is fixedly connected with the inner surface of the cavity (53), a reset spring (59) is fixedly connected between the extension sleeve (60) and the extension rod (58), and mercury is injected between the extension sleeve (60) and the extension rod (58).
10. The inverter drive for an on-board air conditioner compressor according to claim 2, characterized by: The gear slot (56) on the annular outer surface of the rotating rod (54) is in several groups and surrounds half a circle of the rotating rod (54).