Gas tank head part, thermostatic expansion valve and refrigerant filling method

Abstract

The invention provides an air tank head part, a thermostatic expansion valve and a refrigerant filling method, the air tank head part comprises a conduction part and an air tank head, the conduction part comprises a piston and a conduction rod which are fixedly connected, the air tank head is provided with a containing cavity and a through hole, the containing cavity comprises a refrigerant chamber, and the through hole and the refrigerant chamber are located on the two sides of the piston in the axial direction of the conduction rod; the air pressure change of the refrigerant chamber can push the whole piston and the conduction rod to generate displacement, and the air pressure change of the refrigerant chamber is fully converted into the displacement of the piston and the conduction rod, so that the sensitivity of the air box head part is improved.

Description

Technical Field

[0001] The present invention relates to thermal management technology, and particularly to an air box head component, a thermostatic expansion valve and a refrigerant filling method. Background Art

[0002] The air box head component includes an air box seat, an air box cover, heat transfer fins and a diaphragm. The diaphragm is located between the air box cover and the air box seat. The diaphragm and the air box cover cooperate to form a refrigerant chamber filled with refrigerant. At least part of the heat transfer fins contacts the diaphragm. During the operation of the air box head component, the refrigerant is heated to change the air pressure in the refrigerant chamber. The change in the air pressure in the refrigerant chamber causes the central part of the diaphragm to deform. The deformed diaphragm causes the heat transfer fins to displace, and the displaced heat transfer fins can change the position of the valve core of the expansion valve relative to the valve port. However, only the central part of the diaphragm deforms, and the change in the air pressure in the refrigerant chamber cannot be fully converted into the deformation amount of the diaphragm, resulting in a problem of low sensitivity of the air box head component. Summary of the Invention

[0003] The purpose of the present invention is to provide an air box head component, a thermostatic expansion valve and a refrigerant filling method, which have the advantage of high sensitivity.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] In a first aspect, the present invention provides an air box head component, including a conducting member and an air box head. The conducting member includes a piston and a conducting rod. The piston is fixedly connected to the conducting rod. The air box head has a receiving cavity and a through hole. The through hole communicates with the receiving cavity. At least part of the piston is located in the receiving cavity. The piston includes a first outer peripheral wall. The inner wall forming the receiving cavity includes a first inner peripheral wall. At least part of the first outer peripheral wall is slidably connected to the first inner peripheral wall. The receiving cavity includes a refrigerant chamber. Along the axial direction of the conducting rod, the through hole is located on one side of the piston, and the refrigerant chamber is located on the other side of the piston.

[0006] In a second aspect, the present invention provides a thermostatic expansion valve, comprising a gas box head component, a valve body and a valve core assembly. The gas box head component includes a conduction member and a gas box head. The conduction member includes a piston and a conduction rod. The piston is fixedly connected to the conduction rod. The gas box head has a receiving cavity and a through hole. The through hole communicates with the receiving cavity. At least a part of the piston is located in the receiving cavity. The piston includes a first outer peripheral wall. The inner wall forming the receiving cavity includes a first inner peripheral wall. At least a part of the first outer peripheral wall is slidably connected to the first inner peripheral wall. The receiving cavity includes a refrigerant chamber. Along the axial direction of the conduction rod, the through hole is located on one side of the piston, and the refrigerant chamber is located on the other side of the piston. The valve body is fixedly connected to the gas box head. The valve body has a low-pressure refrigerant flow path and a high-pressure refrigerant flow path. The through hole communicates with the low-pressure refrigerant flow path. At least a part of the conduction rod is located in the low-pressure refrigerant flow path. The high-pressure refrigerant flow path has a valve port that cooperates with the valve core assembly. The valve core assembly is drivingly connected to the conduction rod.

[0007] In a third aspect, the present invention provides a refrigerant filling method for filling a refrigerant into the gas box head component as in the first aspect. The method includes:

[0008] Driving the conduction member until the through hole communicates with the refrigerant chamber;

[0009] Filling the refrigerant into the communicating through hole and the receiving cavity until the air pressure in the through hole and the receiving cavity belongs to a preset air pressure range;

[0010] Driving the conduction member until the through hole filled with the refrigerant is located on one side of the piston along the axial direction of the conduction rod and the refrigerant chamber filled with the refrigerant is located on the other side of the piston along the axial direction of the conduction rod.

[0011] In a gas box head component provided by the present invention, it includes a conduction member and a gas box head. The conduction member includes a piston and a conduction rod that are fixedly connected. The gas box head has a receiving cavity and a through hole. The receiving cavity includes a refrigerant chamber. The through hole and the refrigerant chamber are located on both sides of the piston along the axial direction of the conduction rod. When the air pressure in the refrigerant chamber changes, it can push the entire piston and conduction rod to generate displacement. The change in the air pressure in the refrigerant chamber is fully converted into the displacement amount of the piston and the conduction rod, thereby improving the sensitivity of the gas box head component.

[0012] In a thermostatic expansion valve provided by the present invention, it includes a valve body, a valve core assembly, and a gas box head component. The valve body has a low-pressure refrigerant flow path and a high-pressure refrigerant flow path. A through hole communicates with the low-pressure refrigerant flow path. At least part of the conduction rod is located in the low-pressure refrigerant flow path. The temperature of the low-pressure refrigerant flow path is transmitted to the refrigerant chamber through the conduction rod and the piston, and the air pressure in the refrigerant chamber is changed. The change in the air pressure in the refrigerant chamber is fully converted into the displacement of the piston and the conduction rod. The high-pressure refrigerant flow path has a valve port that cooperates with the valve core assembly. The valve core assembly is drivingly connected to the conduction rod. The displacement of the conduction rod is fully converted into the displacement of the valve core assembly relative to the valve port, thereby improving the sensitivity of the opening of the thermostatic expansion valve to the temperature of the low-pressure refrigerant flow path.

[0013] In a refrigerant filling method provided by the present invention, the conduction member is driven until the through hole communicates with the refrigerant chamber, and refrigerant is filled into the communicating through hole and the accommodating cavity until the air pressure belongs to a preset air pressure range. The conduction member is driven until the through hole filled with refrigerant and the refrigerant chamber are located on both sides of the piston along the axial direction of the conduction rod. Only by driving the conduction member can the refrigerant be filled into the refrigerant chamber. Therefore, this refrigerant filling method has the advantage of high filling efficiency. Description of the Drawings

[0014] Figure 1 is one of the three-dimensional structural schematic diagrams of the gas box head component of the present invention;

[0015] Figure 2 is the second three-dimensional structural schematic diagram of the gas box head component of the present invention;

[0016] Figure 3 is the cross-sectional structural schematic diagram of the gas box head component of the present invention;

[0017] Figure 4 is the cross-sectional structural schematic diagram of the inner wall forming the refrigerant chamber and at least part of the first outer peripheral wall of the gas box head component of the present invention with a gap therebetween;

[0018] Figure 5 is the cross-sectional structural schematic diagram of the conduction member of the gas box head component of the present invention;

[0019] Figure 6 is the first cross-sectional schematic diagram of the gas box head of the present invention along the radial direction of the conduction rod;

[0020] Figure 7 is the second cross-sectional schematic diagram of the gas box head of the present invention along the radial direction of the conduction rod;

[0021] Figure 8 is the second cross-sectional schematic diagram of the conduction member of the present invention along the radial direction of the conduction rod;

[0022] Figure 9 is the cross-sectional structural view of the gas box head of the gas box head component of the present invention;

[0023] Figure 10It is a cross-sectional structure diagram of the sealing ring of the air box head component of the present invention;

[0024] Figure 11 It is a schematic exploded structure diagram of the air box head component of the present invention;

[0025] Figure 12 It is a cross-sectional structure diagram of the thermostatic expansion valve of the present invention;

[0026] Figure 13 It is a cross-sectional structure diagram of the valve body of the thermostatic expansion valve of the present invention;

[0027] Figure 14 It is a schematic flow chart of the steps of the refrigerant filling method of the present invention;

[0028] 1. Conducting part; 2. Air box head; 3. Sealing ring; 4. Valve body; 5. Transmission rod; 6. Spool assembly; 7. Spring; 8. Nut; 11. Piston; 12. Conducting rod; 21. Air box cover; 22. Air box seat; 23. Accommodating cavity; 231. Refrigerant chamber; 2311. Second inner peripheral wall; 31. First outer wall; 32. First inner wall; 33. First end wall; 34. Second end wall; 41. Low-pressure refrigerant flow path; 42. Mounting hole; 43. High-pressure refrigerant flow path; 111. First outer peripheral wall; 112. Annular groove; 211. Second bottom wall; 212. Fourth inner peripheral wall; 221. Piston chamber; 222. Through hole; 223. Third bottom wall; 224. First inner peripheral wall; 225. Fifth inner peripheral wall; 226. Third inner peripheral wall; 431. Valve port; 432. Threaded hole; 1121. Second inner wall; 1122. Third end wall; 1123. Fourth end wall; x. Distance between the second bottom wall along the axial direction of the conducting rod and the first inner peripheral wall; y. Piston thickness along the axial direction of the conducting rod; A1. One cross-section of the refrigerant chamber along the radial direction of the conducting rod; A2. One cross-section of the piston along the radial direction of the conducting rod; A3. One cross-section of the piston chamber along the radial direction of the conducting rod. Detailed implementation manners

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0030] The current technology discloses a thermal management system applying a thermostatic expansion valve. The controlled objects of the thermal management system include, but are not limited to, at least one of a vehicle cockpit, a vehicle battery, an engine, and an electric motor. The system includes a thermostatic expansion valve, an evaporator, a compressor, a condenser, and a dryer. The thermostatic expansion valve includes a valve body. The valve body has a low-pressure refrigerant flow path with a low-pressure inlet side and a low-pressure outlet side. The inlet side is connected to the outlet of the evaporator, and the outlet side is connected to the inlet of the compressor. The valve body also has a high-pressure refrigerant flow path with a high-pressure outlet side and a high-pressure inlet side. The high-pressure outlet side is connected to the inlet of the evaporator, and the high-pressure inlet side is connected to the outlet of a liquid receiver. The inlet of the liquid receiver is connected to the outlet of the condenser. The thermostatic expansion valve, the evaporator, the compressor, the condenser, and the dryer form a circulation pipeline, and the refrigerant flows through this circulation pipeline to achieve thermal management.

[0031] The current thermostatic expansion valve further includes a gas box head component. The gas box head component is used to sense the temperature of the refrigerant in the low-pressure refrigerant flow path and adjust the opening degree of the thermostatic expansion valve based on the temperature of the refrigerant in the low-pressure refrigerant flow path, thereby controlling the flow rate of the refrigerant in the high-pressure refrigerant flow path. The gas box head component includes a gas box seat, a gas box cover, a heat transfer fin, a diaphragm, and a head.

[0032] The diaphragm is used to sense the temperature of the refrigerant in the low-pressure refrigerant flow path. The diaphragm is located between the gas box cover and the gas box seat. The gas box cover is fixedly connected to the gas box seat. The diaphragm and the gas box cover cooperate to form a refrigerant chamber filled with refrigerant. At least part of the heat transfer fin contacts the diaphragm. The heat transfer fin is drivably connected to the valve core of the thermostatic expansion valve and is used to adjust the opening degree of the thermostatic expansion valve according to the deformation amount of the diaphragm. The refrigerant in the low-pressure refrigerant flow path can transfer heat to the refrigerant in the refrigerant chamber through the diaphragm. When the temperature of the refrigerant in the low-pressure refrigerant flow path changes, the refrigerant is heated, causing a change in the air pressure in the refrigerant chamber. The change in the air pressure in the refrigerant chamber causes the central part of the diaphragm to deform. The deformed diaphragm causes the heat transfer fin to displace. The displaced heat transfer fin changes the position of the valve core relative to the valve port, thereby realizing that the change in the temperature of the refrigerant in the low-pressure refrigerant flow path causes a change in the opening degree of the thermostatic expansion valve. However, only the central part of the diaphragm deforms, and the change amount of the refrigerant chamber cannot be fully converted into the deformation amount of the diaphragm, resulting in the problem of low sensitivity of the gas box head component. It should be noted that the sensitivity of the gas box head component refers to the deformation amount of the diaphragm in response to the change in the air pressure in the refrigerant chamber, or it can also refer to the displacement amount of the heat transfer fin in response to the change in the air pressure in the refrigerant chamber.

[0033] Furthermore, it is easy for those skilled in the art to think that by increasing the size of the bellows head component (mainly the outer diameter of the diaphragm), the size of the central part of the diaphragm can be increased, thereby improving the sensitivity of the bellows head component. However, the increase in the size of the bellows head component is not proportional to the improvement in its sensitivity. Greatly increasing the size of the bellows head component can only slightly improve its sensitivity, thus resulting in a problem where the input and output are not proportional.

[0034] Furthermore, due to the problem of low sensitivity of the bellows head component in the current thermostatic expansion valve, the sensitivity of the opening of the thermostatic expansion valve to the refrigerant temperature is low. It should be noted that the sensitivity of the opening of the thermostatic expansion valve to the refrigerant temperature refers to the amount of change in the opening caused by the change in the refrigerant temperature.

[0035] Furthermore, due to the problem of low sensitivity of the bellows head component in the current thermal management system, the cooling and heating capabilities of the thermal management system are weak.

[0036] Furthermore, the diaphragm is made of a flexible metal film with a relatively thin thickness to meet its own deformation requirements. However, the relatively thin diaphragm is prone to breakage. Moreover, at least one of the refrigerant and the coolant is mixed with impurities, and the impurities are likely to cause the diaphragm to rupture, thereby resulting in product scrapping.

[0037] Furthermore, the diaphragm is made of a film of an elastic material with its own elastic limit. When the deformation of the diaphragm exceeds the elastic limit, the diaphragm may have problems such as permanent deformation or even rupture.

[0038] Furthermore, the central part of the diaphragm is prone to deformation under pressure, while the edge part of the diaphragm is not easily deformed under pressure. When the diaphragm is squeezed by the refrigerant, the amount of deformation generated in the middle part of the diaphragm is greater than that generated in the edge part of the diaphragm. When the assembly error between the heat transfer sheet and the diaphragm is large, the displacement amount transmitted from the diaphragm to the heat transfer sheet will become smaller, thereby resulting in a problem of flow regulation failure.

[0039] Furthermore, the bellows cover, the bellows seat, and the diaphragm need to be coaxially installed to improve the transmission reliability of the bellows head component. However, all three parts need to be coaxially arranged, which also causes a problem of large assembly difficulty for the bellows head component.

[0040] Furthermore, the diaphragm and the heat transfer sheet do not make full contact, and the deformation amount of the diaphragm cannot be completely transmitted to the heat transfer sheet, which is very likely to cause the change in the opening of the thermostatic expansion valve to not stably reflect the change in the refrigerant temperature, resulting in a problem of unstable transmission.

[0041] Furthermore, the air box head component further includes a head, the air box cover has a hole, the hole communicates with the refrigerant chamber, the refrigerant can be filled into the refrigerant chamber through the hole, the head is welded or glued to the air box cover, the head plugs the hole, and the air box cover and the head form a sealed structure to facilitate filling the refrigerant into the refrigerant chamber and isolating the refrigerant from the outside. However, on the one hand, this sealed structure increases the number of components of the air box head component, thereby increasing the structural complexity of the air box head component; on the other hand, adopting the above-mentioned sealed structure also increases the complexity of the process of filling the refrigerant into the refrigerant chamber, thereby causing problems of high cost and low filling efficiency of the air box head component.

[0042] Based on the problems of the current technology, the present invention provides an air box head component, which includes a conducting member 1 and an air box head 2. The conducting member 1 includes a piston 11 and a conducting rod 12. The piston 11 is fixedly connected to the conducting rod 12. The air box head 2 has a receiving cavity 23 and a through hole 222. The through hole 222 communicates with the receiving cavity 23. At least a part of the piston 11 is located in the receiving cavity 23. The piston 11 includes a first outer peripheral wall 111. The inner wall forming the receiving cavity 23 includes a first inner peripheral wall 224. At least a part of the first outer peripheral wall 111 is slidably connected to the first inner peripheral wall 224. Along the axial direction of the conducting rod 12, the through hole 222 is located on one side of the piston 11, and the refrigerant chamber 231 is located on the other side of the piston 11. When the air pressure in the refrigerant chamber 231 changes, it can push the entire piston 11 and the conducting rod 12 to generate a displacement, that is, the first outer peripheral wall 111 slides relative to the first inner peripheral wall 224. The change in the air pressure in the refrigerant chamber 231 is fully converted into the displacement of the piston 11 and the conducting rod 12, thereby improving the sensitivity of the air box head component.

[0043] In order to enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0044] Embodiment 1

[0045] The following will be combined with Figures 1-11 , and will introduce in detail an air box head component provided by an embodiment of the present invention. The air box head component includes a conducting member 1, an air box head 2 and a sealing ring 3. The conducting member 1 includes a piston 11 and a conducting rod 12. The piston 11 and the conducting rod 21 are connected with limited position.

[0046] The air box head 2 has a receiving cavity 23 and a through hole 222. The through hole 222 communicates with the receiving cavity 23. At least part of the piston 11 is located in the receiving cavity 23. The piston 11 includes a first outer peripheral wall 111. The inner wall forming the receiving cavity 23 includes a first inner peripheral wall 224. At least part of the first outer peripheral wall 111 is slidably connected to the first inner peripheral wall 224. The receiving cavity 23 includes a refrigerant chamber 231. The through hole 222 is located on one side of the piston 11 along the axial direction of the conduction rod 12, and the refrigerant chamber 231 is located on the other side of the piston 11 along the axial direction of the conduction rod 12. When the air pressure in the refrigerant chamber changes, pressure is applied to the other side of the piston 11 along the axial direction of the conduction rod 12, and the entire piston 11 and the conduction rod 12 are pushed to generate a displacement relative to the air box head 2. By using the method of transmitting power between the refrigerant chamber 231 and the conduction rod 12 through the piston 11, the sensitivity of the air box head component is improved.

[0047] Further, the refrigerant chamber 231 is filled with a refrigerant, which is a material with a relatively large coefficient of thermal expansion, enhancing the sensitivity of the air pressure in the refrigerant chamber 231 to temperature.

[0048] Further, as Figure 3 shown, when the outer diameter of the piston 11 is reduced, the displacement of the piston 11 and the conduction rod 12 can be increased under the same pressure in the enlarged refrigerant chamber 231, thereby significantly enhancing the sensitivity of the air box head component, and achieving the effect of small input and large return.

[0049] Further, along the axial direction of the conduction rod 12, the piston 11 is separated between the through hole 222 and the refrigerant chamber 231. The first outer peripheral wall 111 contacts the first inner peripheral wall 224. The piston 11 seals the refrigerant in the refrigerant chamber 231, preventing the refrigerant from leaking from the refrigerant chamber 231 and also preventing impurities from entering the refrigerant chamber 231 through the through hole 222.

[0050] Further, the air box head component is composed of a conduction member 1, an air box head 2 and a sealing ring 3, reducing the number of parts of the air box head component and simplifying the structure of the air box head component, and also facilitating the preparation and assembly of the air box head component.

[0051] In a possible implementation manner, the inner wall forming the refrigerant chamber 231 includes a second inner peripheral wall 2311. The second inner peripheral wall 2311 is located on the circumferential side of the first inner peripheral wall 224. Along the radial direction of the conduction rod 12, the cross-sectional area of at least part of the refrigerant chamber 231 is larger than the cross-sectional area of the piston 11. The area of any cross-section of the refrigerant chamber 231 is greater than or equal to the area of any cross-section of the piston 11, as Figure 6 and Figure 8As shown, A1 shows one cross-section of the refrigerant chamber 231 along the radial direction of the conduction rod 12, and A2 shows one cross-section of the piston 11 along the radial direction of the conduction rod 12, where A1 > A2. In the refrigerant filling method applied to this gas tank head component, when at least part of the piston 11 slides into the refrigerant chamber 231, a gap is provided between the first outer peripheral wall 111 and the second inner peripheral wall 2311. The user can fill the refrigerant into this gap through the through hole 222 without removing the piston 11 from the accommodation cavity 23, thereby simplifying the refrigerant filling process and improving the filling efficiency. Compared with the prior art, there is no need to open holes on the gas tank head 2 and install a sealing head, thereby simplifying the number of parts and the structure of the gas tank head component.

[0052] Further, as Figure 9 shown, the second inner peripheral wall 2311 includes a fifth inner peripheral wall 225. The fifth inner peripheral wall 225 is located on the circumferential outer side of the first inner peripheral wall 224 and extends substantially radially outward of the conduction rod 12, thereby increasing the gap between the first outer peripheral wall 111 and the fifth inner peripheral wall 225 when filling the refrigerant. Specifically, the fifth inner peripheral wall 225 is a conical surface, and the end with a larger inner diameter of the fifth inner peripheral wall 225 is farther from the first inner peripheral wall 224 than the end with a smaller inner diameter of the fifth inner peripheral wall 225. Thus, the fifth inner peripheral wall 225 plays a role in guiding the flow when filling the refrigerant.

[0053] Further, as Figure 9 shown, the second inner peripheral wall 2311 further includes a third inner peripheral wall 226. The fifth inner peripheral wall 225 extends from the first inner peripheral wall 224 to the third inner peripheral wall 226. The third inner peripheral wall 226 is farther from the first inner peripheral wall 224 than the fifth inner peripheral wall 225. The third inner peripheral wall 226 is also a conical surface. The end with a larger inner diameter of the third inner peripheral wall 226 is farther from the fifth inner peripheral wall 225 than the end with a smaller inner diameter of the third inner peripheral wall 226. The taper of the third inner peripheral wall 226 is smaller than the taper of the fifth inner peripheral wall 225. The overall shape of the third inner peripheral wall 226 and the fifth inner peripheral wall 225 is similar to an elliptical surface, thereby making full use of the space of the gas tank head 2 and increasing the volume of the refrigerant chamber 231.

[0054] In a possible implementation, as Figure 9 shown, the inner wall forming the refrigerant chamber 231 further includes a second bottom wall 211. The second inner peripheral wall 2311 is located on the circumferential side of the second bottom wall 211. Along the axial direction of the conduction rod 12, the second bottom wall 211 is on the other side of the piston 11. The second bottom wall 211 is farther from the first inner peripheral wall 224 than the second inner peripheral wall 2311. The distance between the second bottom wall 211 and the first inner peripheral wall 224 is greater than the thickness of the piston 11. As Figure 5 and Figure 9As shown, the second bottom wall 211 is located on the sliding path of the piston 11 relative to the gas tank head 2. The second bottom wall 211 defines the sliding stroke of the piston 11 relative to the gas tank head 2. x represents the distance between the second bottom wall 211 and the first inner peripheral wall 224 along the axial direction of the conduction rod 12, and y represents the thickness of the piston 11 along the axial direction of the conduction rod 12, where x > y. In the refrigerant filling method of this gas tank head component, when the piston 11 slides towards the second bottom wall 211 until it abuts against the gas tank head 2, the entire piston 11 is located in the refrigerant chamber 231, and the first outer peripheral wall 111 disengages from the first inner peripheral wall 224, facilitating the filling of refrigerant into the refrigerant chamber 231 through the through hole 222.

[0055] Furthermore, along the axial direction of the conduction rod 12, the thickness of the piston 11 is not less than 2 mm. Under the pressure of the refrigerant, the piston 11 is not easily deformed, avoiding the problems of permanent deformation or even rupture of the piston 11, thereby improving the durability of the gas tank head component. Preferably, the thickness of the piston 11 is 2 mm, and the piston 11 with a thickness of 2 mm takes into account both mechanical strength and thermal conductivity.

[0056] Furthermore, as Figure 9 shown, the second inner peripheral wall 2311 further includes a fourth inner peripheral wall 212. The fourth inner peripheral wall 212 is located on the circumferential side of the second bottom wall 211. The fourth inner peripheral wall 212 is also a conical surface. The end with a larger inner diameter of the fourth inner peripheral wall 212 is farther from the second bottom wall 211 than the end with a smaller inner diameter of the fourth inner peripheral wall 212. The fourth inner peripheral wall 212 extends from the second bottom wall 211 towards the third inner peripheral wall 226. The end with a smaller inner diameter of the fourth inner peripheral wall 212 is farther from the third inner peripheral wall 226 than the end with a larger inner diameter of the fourth inner peripheral wall 212. As Figure 3 shown, the design of sequentially arranging the second bottom wall 211, the fourth inner peripheral wall 212, the third inner peripheral wall 226, and the fifth inner peripheral wall 225 makes the cross-section of the refrigerant chamber 231 along the longitudinal direction of the conduction rod 12 approximately elliptical, thereby making full use of the space of the gas tank head 2 and increasing the volume of the refrigerant chamber 231.

[0057] In a possible implementation, as Figure 3 shown, the gas tank head 2 includes a gas tank cover 21 and a gas tank seat 22. The gas tank cover 21 and the gas tank seat 22 are fixedly connected. The gas tank cover 21 includes the above-mentioned second bottom wall 211, and the gas tank seat 22 has the above-mentioned through hole 222. When assembling this gas tank head component, the piston 11 can be first placed between the gas tank cover 21 and the gas tank seat 22, and then the gas tank cover 21 and the gas tank seat 22 are fixedly connected, facilitating the assembly of the gas tank head component.

[0058] Furthermore, the fixed connection method between the gas tank head 2 and the gas tank seat 22 includes but is not limited to at least one of welding, riveting, and crimping.

[0059] Furthermore, as Figure 9As shown, a first inner peripheral wall 224, a fifth inner peripheral wall 225, and a third inner peripheral wall 226 are formed on the air box base 22, and a fourth inner peripheral wall is formed on the air box cover 21. When the air box head 2 and the air box base 22 are fixedly connected, the fifth inner peripheral wall 225, the third inner peripheral wall 226, and the fourth inner peripheral wall 212 form a second inner peripheral wall.

[0060] Further, as Figure 9 and Figure 11 shown, the air box cover 21 is a thin-walled part, and the air box base 22 is also a thin-walled part. The outer shapes of the air box cover 21 and the air box base 22 are a combination of an oblate circle and a cylinder.

[0061] In a possible implementation manner, as Figure 9 shown, the accommodation cavity 23 includes a piston chamber 221. A through hole 222 communicates with the piston chamber 221, and a refrigerant chamber 231 communicates with the piston chamber 221. The piston chamber 221 is located between the through hole 222 and the refrigerant chamber 231. The inner wall forming the piston chamber 221 includes the above-mentioned first inner peripheral wall 224. The first outer peripheral wall 111 is the outer peripheral wall of the piston 11, and the piston 11 is located in the piston chamber 221.

[0062] Further, along the radial direction of the conduction rod 12, at least part of the cross-sectional area of the refrigerant chamber 231 is larger than the cross-sectional area of the piston chamber 221. The area of any cross-section of the refrigerant chamber 231 is greater than or equal to the area of any cross-section of the piston chamber 221. As Figure 7 shown, A3 indicates one of the cross-sections of the piston chamber 221 along the radial direction of the conduction rod, and A3 < A1.

[0063] Further, the piston chamber is formed on the air box base 22. The piston chamber 221 is a straight hole, and the piston 11 and the piston chamber 221 are coaxially arranged. A hole-shaft assembly structure is adopted, reducing the number of parts that need to be coaxially arranged, and thus reducing the assembly difficulty.

[0064] In a possible implementation manner, as Figure 3 shown, the piston 11 and a part of the conduction rod 12 are located in the piston chamber 221. The piston chamber 221 is a blind hole. The inner wall forming the piston chamber 221 further includes a third bottom wall 223. The through hole 222 is formed on the third bottom wall 223. Along the axial direction of the conduction rod 12, the third bottom wall 223 is located on one side of the piston 11, and the third bottom wall 223 also defines the sliding stroke of the piston 11.

[0065] Further, the conduction rod 12 is located axially outside the piston 11. The conduction rod 12 extends along the axial direction of the piston 11. The through hole 222 is located axially outside the piston chamber 221. When the piston 11 slides relative to the air box head 2, the conduction rod 12 can telescopically move relative to the air box head 2, so as to facilitate the transmission of the piston 11 through the conduction rod 12.

[0066] Further, asFigure 7 and Figure 11 As shown in Figure 11 , there are at least two through holes 222. One through hole 222 is located on the axis of the conduction rod 12, and the remaining through holes 222 are arranged in a circular pattern centered on the through hole 222 located on the axis of the conduction rod 21, so that at least one of the refrigerant and the coolant can flow through the remaining through holes 222.

[0067] In a possible implementation, as Figure 3 and Figure 11 shown, the sealing ring 3 is connected to the piston 11 in a limiting manner. At least part of the sealing ring 3 contacts the outer wall of the piston 11, and at least part of the sealing ring 3 contacts the first outer peripheral wall 111. The sealing ring 3 is in a compressed state, further improving the tightness of the refrigerant chamber 231.

[0068] In a possible implementation, as Figure 5 shown, the piston 11 has an annular groove 112 formed on the first outer peripheral wall 111. At least part of the sealing ring 3 is located in the annular groove 112, and at least part of the sealing ring 3 contacts the inner wall forming the annular groove 112, thereby improving the connection stability between the sealing ring 3 and the piston 11.

[0069] Furthermore, the annular groove 112 is formed on the first outer peripheral wall 111. The sealing ring 3 includes a first outer wall 31, a first inner wall 32, a first end wall 33, and a second end wall 34. The inner wall forming the annular groove 112 includes a second inner wall 1121, a third end wall 1122, and a fourth end wall 1123. At least part of the first outer wall 31 contacts the first outer peripheral wall 111, at least part of the first inner wall 32 contacts the second inner wall 1121, at least part of the first end wall 33 contacts the third end wall 1122, and at least part of the second end wall 34 contacts the fourth end wall 1123, further improving the tightness of the refrigerant chamber 231.

[0070] In a possible implementation, as Figure 5 shown, the piston 11 and the conduction rod 12 are of an integral structure. The materials used to make the piston 11 and the conduction rod 12 are made of materials with good thermal conductivity, high mechanical strength, and good wear resistance, so that the integral structure of the piston 11 and the conduction rod 12 has the characteristics of good thermal conductivity, high mechanical strength, and good wear resistance, facilitating heat exchange of the refrigerant in the refrigerant chamber 231 through the piston 11 and improving the durability of the piston 11. Materials with good thermal conductivity, high mechanical strength, and good wear resistance include but are not limited to aluminum alloy, and the model of the aluminum alloy is 6061.

[0071] Embodiment 2

[0072] Next, in combination with Figures 12-13, a thermostatic expansion valve provided by an embodiment of the present invention will be introduced in detail. The thermostatic expansion valve includes a gas box head component as in Embodiment 1, and further includes a valve body 4, a transmission rod 5, a valve core assembly 6, a spring 7 and a nut 8.

[0073] The gas box head 2 is fixedly connected to the valve body 4. The valve body 4 has a low-pressure refrigerant flow path 41, a mounting hole 42 and a high-pressure refrigerant flow path 43. The mounting hole 42 communicates with the low-pressure refrigerant flow path 41, and the mounting hole 42 also communicates with the high-pressure refrigerant flow path 43. A through hole 222 communicates with the low-pressure refrigerant flow path 41. At least part of the conduction rod 12 is located in the low-pressure refrigerant flow path 41. The transmission rod 5 is limit-connected to the conduction rod 12. At least part of the transmission rod 5 is located in the mounting hole 42. When the coolant flows through the low-pressure refrigerant flow path 41, it can enter the through hole 222 and the piston chamber 221. The coolant can exchange heat with the refrigerant in the refrigerant chamber 231 through the conduction rod 12 and the piston 11, or can also exchange heat with the refrigerant in the refrigerant chamber 231 through the piston 11.

[0074] The high-pressure refrigerant flow path 43 has a valve port 431. One port of the high-pressure refrigerant flow path 43 communicates with the valve port 431, and the valve port 431 also communicates with the other port of the high-pressure refrigerant flow path 43. The valve core assembly 6 is slidably connected to the valve body 4. The valve core assembly 6 cooperates with the valve port 431. At least part of the valve core assembly 6 is located in the high-pressure refrigerant flow path 43. At least part of the valve core assembly 6 is also located axially outside the valve port 431. The sliding direction of the valve core assembly 6 relative to the valve body 4 is the same as the axis of the valve port 431. When the valve core assembly 6 slides relative to the valve body 4, the valve core assembly 6 can adjust the opening degree of the valve port 431. The sliding direction of the valve core assembly 6 relative to the valve body 4 is the same as the sliding direction of the transmission rod 5 relative to the gas box head 2. At least part of the transmission rod 5 abuts against the valve core assembly 6. The valve core assembly 6 is drivingly connected to the conduction rod 12 through the transmission rod 5. When the transmission rod 5 is displaced relative to the gas box head 2, it can push the valve core assembly 6 away from the valve port 431, that is, the opening degree of the valve port 431 becomes larger.

[0075] At least part of the spring 7 is located in the high-pressure refrigerant flow path 43. The spring 7 is located between the valve core assembly 6 and the nut 8. One end of the spring 7 contacts the valve core assembly 6, and the other end of the spring 7 contacts the nut 8. The spring 7 is used to drive the valve core assembly 6 and the transmission rod 5 to keep in contact with each other. The spring 7 is also used to provide a spring force for balancing the damping force received by the piston 11, so that the piston 11 can better sense the volume change of the refrigerant.

[0076] Furthermore, in the case of the volume of the refrigerant chamber, reducing the outer diameter of the piston 11, that is, increasing the area of the region enclosed by the first outer circumference 111, can significantly improve the sensitivity of the thermostatic expansion valve, and thus achieve the effect of small investment and large return. Moreover, applying this thermostatic expansion valve to a thermal management system can significantly improve the refrigeration and heating capacity of the system and can more easily increase the refrigeration tons of the system.

[0077] At least a part of the nut 8 is located in the high-pressure refrigerant flow path 43. The nut 8 is threadedly connected to the valve body 4, and the screw rotation direction of the nut 8 relative to the valve body 4 is along the axial direction of the valve port 431. The sliding direction of the valve core assembly 6 relative to the valve body 4, the sliding direction of the transmission rod 5 relative to the gas tank head 2, the axial direction of the valve port 431, and the screw rotation direction of the nut 8 relative to the valve body 4 are the same. When the nut 8 rotates relative to the valve body 4 in a screw manner, the nut 8 can approach or move away from the valve port 431, and the spring force of the spring 7 on the valve core assembly 6 is adjustable, thereby better adjusting the balance state between the piston 11 damping and the spring force.

[0078] Specifically, as Figure 13 shown, the high-pressure refrigerant flow path 43 also has a threaded hole 432. The threaded hole 432 communicates with the valve port 431, the axial direction of the threaded hole 432 is the same as the axial direction of the valve port 431, and at least a part of the nut 8 is threadedly connected to the threaded hole 432.

[0079] In a possible implementation manner, the transmission rod 5 is made of a heat-insulating material to prevent heat exchange between the low-pressure refrigerant flow path 41 and the high-pressure refrigerant flow path 43 through the transmission rod 5.

[0080] Embodiment III

[0081] Next, in combination with Figure 14 , a refrigerant filling method provided by an embodiment of the present invention will be introduced in detail, which is used for filling refrigerant into the gas tank head component as in Embodiment I. The method includes:

[0082] S101: Drive the conduction member 1 until the through hole 222 communicates with the refrigerant chamber 231;

[0083] Among them, the above-mentioned driving of the conduction member 1 refers to driving the conduction member 1 to slide relative to the gas tank head 2. After driving the conduction member 1 in S101, the piston 11 is not separated between the through hole 222 and the refrigerant chamber 231, avoiding the piston 11 from obstructing the filling of the refrigerant through the through hole 222 into the refrigerant chamber 231.

[0084] In a possible implementation manner, the "drive the conduction member 1 until the through hole 222 communicates with the refrigerant chamber 231" in the above S101 includes:

[0085] Drive the conduction member 1 until a gap is provided between the inner wall of the formed refrigerant chamber 231 and at least a part of the first outer peripheral wall 111, and the through hole 222 communicates with the gap between the inner wall of the formed refrigerant chamber 231 and at least a part of the first outer peripheral wall 111;

[0086] Among them, as shown in 4, after driving the driving and conducting member 1, the first outer peripheral wall 111 is separated from the first inner peripheral wall 224, one side of the piston 11 along the axis of the conducting rod 12 abuts against the fourth inner peripheral wall 212, at least part of the piston 11 is located in the refrigerant chamber 231, at least part of the first outer peripheral wall 111 and the second inner peripheral wall 2311 are arranged with a gap, and further the through hole 222, the piston chamber 221 and the refrigerant chamber 231 are communicated.

[0087] In a possible implementation manner, the driving and conducting member 1 is driven by clamping the conducting rod 12.

[0088] Furthermore, in this method, a tooling fixture can be used to clamp the conducting rod 12, and a motor is used to drive the tooling fixture, the conducting rod 12 and the piston 11.

[0089] S102: Evacuate the communicated through hole 222 and the accommodation chamber 23;

[0090] Among them, by evacuating the through hole 222 and the accommodation chamber 23, impurities in the through hole 222 and the accommodation chamber 23 are removed. The impurities in the through hole 222 and the accommodation chamber 23 include but are not limited to at least one of moisture, lubricating oil, and non-condensable gas.

[0091] In a possible implementation manner, the through hole 222 and the accommodation chamber 23 are evacuated until the air pressure in the through hole 222 and the accommodation chamber 23 is less than the vacuum air pressure, and the vacuum air pressure can be 10 Pa.

[0092] In a possible implementation manner, an air pump is used to evacuate the through hole 222 and the accommodation chamber 23.

[0093] In a possible implementation manner, there are at least two through holes 222. Evacuating the through hole 222 and the accommodation chamber 23 includes:

[0094] Inert gas is filled into the through hole 222 and the accommodation chamber 23 through some of the through holes 222, and at the same time, the through hole 222 and the accommodation chamber 23 are evacuated through some other through holes 222;

[0095] Among them, the filling amount of the inert gas is greater than the volume of the through hole 222 and the accommodation chamber 23, and the temperature of the inert gas is greater than 100 degrees Celsius. The evacuation amount of the through hole 222 and the accommodation chamber 23 is also greater than the volume of the through hole 222 and the accommodation chamber 23. Furthermore, the vast majority of impurities in the through hole 222 and the accommodation chamber 23 are removed.

[0096] Then, the through hole 222 through which the inert gas is filled and the accommodation chamber 23 are evacuated through the through hole 222 until the air pressure in the through hole 222 and the accommodation chamber 23 is less than the vacuum air pressure.

[0097] S103: Fill the through - hole 222 and the accommodation chamber 23 that have been evacuated with refrigerant until the air pressure in the through - hole 222 and the accommodation chamber 23 is within a preset air - pressure range;

[0098] Among them, the preset air - pressure range includes an upper air - pressure value and a lower air - pressure value. The upper air - pressure value is greater than the lower air - pressure value. The upper air - pressure value is greater than the standard atmospheric pressure, and the lower air - pressure value is also greater than the standard atmospheric pressure. So that under normal working conditions, at least part of the piston 11 can stay in the piston chamber 221 and at least part of the first outer peripheral wall 111 contacts the first inner peripheral wall 224. The upper air - pressure value is also less than the sum of the standard atmospheric pressure and the limit pressure of the spring 7 to avoid the problem that the dynamic balance adjustment of the spring 7 to the piston 11 fails.

[0099] In a possible implementation, the above - mentioned S103 "Fill the through - hole 222 and the accommodation chamber 23 that have been evacuated with refrigerant until the air pressure in the through - hole 222 and the accommodation chamber 23 is within a preset air - pressure range" includes:

[0100] Fill the through - hole 222 and the accommodation chamber 23 that have been evacuated with refrigerant at a preset inflation speed and for a preset inflation time, then detect the actual air pressure in the through - hole 222 and the accommodation chamber 23, and judge whether the actual air pressure is within the preset air - pressure range. If so, enter S104; if not, iterate S103.

[0101] In a possible implementation, the filling amount of the refrigerant is greater than the volume of the through - hole 222 and the accommodation chamber 23 to ensure that the through - hole 222 and the accommodation chamber 23 are fully filled with refrigerant.

[0102] In a possible implementation, fill the through - hole 222 and the accommodation chamber 23 that have been evacuated with refrigerant through the through - hole 222.

[0103] In a possible implementation, the density of the inert gas is less than the density of the refrigerant. There are at least two through - holes 222. The above - mentioned "Fill the through - hole 222 and the accommodation chamber 23 that have been evacuated with refrigerant through the through - hole 222" includes:

[0104] Adjust the placement angle of the air - box head 2 until the evacuated through - hole 222 and the accommodation chamber 23 are arranged in sequence from top to bottom;

[0105] Fill the adjusted through - hole 222 and the accommodation chamber 23 with refrigerant through some of the through - holes 222. At the same time, discharge the overflowing inert gas and refrigerant through some other through - holes 222 until the air pressure in the through - hole 222 and the accommodation chamber 23 is within the preset air - pressure range;

[0106] Among them, as Figure 4As shown, when the through hole 222 and the accommodation chamber 23 are arranged in sequence from top to bottom, the through hole 222, the piston chamber 221, and the refrigerant chamber 231 are arranged in sequence from top to bottom. Specifically, the third bottom wall 223, the first inner peripheral wall 224, the fifth inner peripheral wall 225, the third inner peripheral wall 226, the fourth inner peripheral wall 212, and the second bottom wall 211 are arranged in sequence from top to bottom. Since the density of the refrigerant is greater than that of the inert gas, the refrigerant can settle to the refrigerant chamber 231, and the inert gas floats to the through hole 222, further reducing the impurity content rate of the refrigerant after filling.

[0107] In a possible implementation manner, an air pump is used to fill the evacuated through hole 222 and the accommodation chamber 23 with the refrigerant.

[0108] S104: Drive the conduction member 1 until the through hole 222 filled with the refrigerant is located on one side of the piston 11 along the axial direction of the conduction rod 12, and the refrigerant chamber 23 filled with the refrigerant is located on the other side of the piston 11 along the axial direction of the conduction rod 12.

[0109] Among them, the above S104 is equivalent to resetting the conduction member 1, and finally obtaining the air box head component filled with the refrigerant. After driving the conduction rod 12, the piston 11 is separated between the through hole 222 and the refrigerant chamber 231, and the first outer peripheral wall 111 contacts the first inner peripheral wall 224, thereby obtaining the air box head component filled with the refrigerant. The refrigerant is located in the sealed refrigerant chamber 231 to ensure that the refrigerant is isolated from the outside.

[0110] In a possible implementation manner, the jig in S101 is used to clamp the conduction rod 12 and the motor is used to reset the conduction member 1.

[0111] In a possible implementation manner, it is also necessary to conduct spot checks on the air box head components filled with the refrigerant. The method further includes:

[0112] Conduct low-temperature storage tests and high-temperature storage tests on the air box head components filled with the refrigerant. Among them, the temperature during the low-temperature storage test is -55 °C, and the temperature during the high-temperature storage test is 135 °C.

[0113] In a possible implementation manner, the method further includes:

[0114] Before S101, take out the conduction member 1 and the air box seat 22, place the piston 11 in the piston chamber 221, and pass the conduction rod 12 through the through hole 222;

[0115] Then take out the air box cover 21, place the air box cover 21 on the air box seat 22, so that the end with the larger inner diameter of the third inner peripheral wall 226 is aligned with the end with the larger inner diameter of the fourth inner peripheral wall 212;

[0116] Finally, the larger-diameter end of the third inner peripheral wall 226 and the larger-diameter end of the fourth inner peripheral wall 212 are fixedly connected, thereby obtaining the assembled air box head 2 and the conduction member 1. Specifically, the fixed connection method between the larger-diameter end of the third inner peripheral wall 226 and the larger-diameter end of the fourth inner peripheral wall 212 includes but is not limited to at least one of welding, crimping, and riveting.

[0117] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although the present specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify the present invention or make equivalent substitutions, and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An air box head component, comprising a conducting member (1) and an air box head (2), wherein the conducting member (1) includes a piston (11) and a conducting rod (12), the piston (11) is fixedly connected to the conducting rod (12), the air box head (2) has a receiving cavity (23) and a through hole (222), the through hole (222) communicates with the receiving cavity (23), at least part of the piston (11) is located in the receiving cavity (23), the piston (11) includes a first outer peripheral wall (111), the inner wall forming the receiving cavity (23) includes a first inner peripheral wall (224), and at least part of the first outer peripheral wall (111) is slidably connected to the first inner peripheral wall (224). The receiving cavity (23) includes a refrigerant chamber (231). Along the axial direction of the conducting rod (12), the through hole (222) is located on one side of the piston (11), and the refrigerant chamber (231) is located on the other side of the piston (11).

2. The air box head component according to claim 1, characterized in that, The inner wall forming the refrigerant chamber (231) includes the second inner peripheral wall (2311), the second inner peripheral wall (2311) is located on the circumferential side of the first inner peripheral wall (224), and along the radial direction of the conducting rod (12), the cross-sectional area of at least part of the refrigerant chamber (231) is larger than the cross-sectional area of the piston (11).

3. The air box head component according to claim 2, characterized in that, The inner wall forming the refrigerant chamber (231) further includes a second bottom wall (211), the second inner peripheral wall (2311) is located on the circumferential side of the second bottom wall (211), along the axial direction of the conducting rod (12), the second bottom wall (211) is located on the other side of the piston (11), the second bottom wall (211) is farther from the first inner peripheral wall (224) relative to the second inner peripheral wall (2311), and the distance between the second bottom wall (211) and the first inner peripheral wall (224) is greater than the thickness of the piston (11).

4. The air box head component according to claim 3, characterized in that, The air box head (2) includes an air box cover (21) and an air box seat (22), the air box cover (21) is fixedly connected to the air box seat (22), the air box cover (21) includes the second bottom wall (211), and the air box seat (22) has the through hole (222).

5. The air box head component according to any one of claims 1 to 4, characterized in that, The receiving cavity (23) includes a piston chamber (221), the through hole (222) communicates with the piston chamber (221), the refrigerant chamber (231) communicates with the piston chamber (221), the inner wall forming the piston chamber (221) includes the first inner peripheral wall (224), and the piston (11) is located in the piston chamber (221).

6. The air box head component according to claim 5, wherein, The piston (11) and part of the conducting rod (12) are located in the piston chamber (221), the inner wall forming the piston chamber (221) further includes a third bottom wall (223), the through hole (222) is formed in the third bottom wall (223), and along the axial direction of the conducting rod (12), the third bottom wall (223) is located on one side of the piston (11).

7. The air box head component according to any one of claims 1 to 6, characterized in that, The gas box head component further includes a sealing ring (3), the sealing ring (3) is connected to the piston (11) in a limiting manner, and at least part of the sealing ring (3) is in contact with the first outer peripheral wall (111).

8. The air box head component according to claim 7, characterized in that, The piston (11) has an annular groove (112), the annular groove (112) is formed on the first outer peripheral wall (111), at least part of the sealing ring (3) is located in the annular groove (112), and at least part of the sealing ring (3) is in contact with the inner wall forming the annular groove (112).

9. The air box head component according to any one of claims 1 to 8, characterized in that, The piston (11) and the conduction rod (12) are of an integral structure, and the materials for making the piston (11) and the transmission rod (5) include aluminum alloy.

10. A thermostatic expansion valve, comprising a gas box head component, a valve body (4) and a valve core assembly (6), the gas box head component includes a conduction member (1) and a gas box head (2), the conduction member (1) includes a piston (11) and a conduction rod (12), the piston (11) is fixedly connected to the conduction rod (12), the gas box head (2) has a receiving cavity (23) and a through hole (222), the through hole (222) communicates with the receiving cavity (23), at least part of the piston (11) is located in the receiving cavity (23), the piston (11) includes a first outer peripheral wall (111), the inner wall forming the receiving cavity (23) includes a first inner peripheral wall (224), at least part of the first outer peripheral wall (111) is slidably connected to the first inner peripheral wall (224), the receiving cavity (23) includes a refrigerant chamber (231), along the axial direction of the conduction rod (12), the through hole (222) is located on one side of the piston (11), and the refrigerant chamber (231) is located on the other side of the piston (11), the valve body (4) is fixedly connected to the gas box head (2), the valve body (4) has a low-pressure refrigerant flow path (41) and a high-pressure refrigerant flow path (43), the through hole (222) communicates with the low-pressure refrigerant flow path (41), at least part of the conduction rod (12) is located in the low-pressure refrigerant flow path (41), the high-pressure refrigerant flow path (43) has a valve port (431) cooperating with the valve core assembly (6), and the valve core assembly (6) is in transmission connection with the conduction rod (12).

11. A refrigerant filling method for filling refrigerant into the gas box head component according to any one of claims 1 to 9, the method comprising: Driving the conduction member (1) until the through hole (222) communicates with the refrigerant chamber (23); Filling the refrigerant into the communicated through hole (222) and the receiving cavity (23) until the air pressure in the through hole (222) and the receiving cavity (23) belongs to a preset air pressure range; Driving the conduction member (1) until the through hole (222) filled with the refrigerant is located on one side of the piston (11) along the axial direction of the conduction rod (12) and the refrigerant chamber (23) filled with the refrigerant is located on the other side of the piston (11) along the axial direction of the conduction rod (12).

12. The refrigerant filling method according to claim 11, wherein "Driving the conductive member (1) until the through hole (222) communicates with the refrigerant chamber (23)" includes: Driving the conductive member (1) until a clearance is provided between the inner wall of the refrigerant chamber (231) formed and at least a part of the first outer peripheral wall (111), and the through hole (222) communicates with the clearance between the inner wall of the refrigerant chamber (231) formed and at least a part of the first outer peripheral wall (111).

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