Thermostatic expansion valve

Abstract

The utility model provides a kind of thermal expansion valve, belong to thermal management technical field, including gas tank head, gas tank head includes gas tank cover, gas tank seat, diaphragm, gas tank cover is fixedly arranged with gas tank seat, diaphragm is located between gas tank cover and gas tank seat, diaphragm includes straight portion, corrugated portion and fixed portion, along the radial direction of gas tank head, corrugated portion is located between straight portion and fixed portion, fixed portion is fixedly arranged with gas tank cover and / or gas tank seat, gas tank cover is located the other side of diaphragm;The diameter of definition diaphragm is recorded as D1, the outer diameter of corrugated portion is D2, the outer diameter of straight portion is C, D1≤30mm, 1.0≤D2 / C≤2.5. By setting the diameter D1 of gas tank head diaphragm in D1≤30mm range, and the ratio of corrugated portion D2 and straight portion C is in the range of 1.0≤D2 / C≤2.5, so that the diameter of diaphragm is reduced, and then the diameter of gas tank head is reduced, to realize the miniaturization of thermal expansion valve.

Description

Technical Field

[0001] This utility model relates to the field of thermal management technology, specifically to a thermal expansion valve. Background Technology

[0002] Thermostatic expansion valves are important automatic control components in refrigeration systems. They use temperature changes in the gas chamber head (temperature sensing bulb) as a signal to control the axial movement of the valve core via a transmission rod, thereby adjusting the valve opening and changing the refrigerant flow rate. Currently, the diaphragm size of thermostatic expansion valve gas chamber heads is large, resulting in a relatively large gas chamber head size. Utility Model Content

[0003] The purpose of this invention is to provide a miniaturized thermostatic expansion valve, which aims to reduce the size of the thermostatic expansion valve while meeting performance requirements.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a thermostatic expansion valve, including a gas tank head. The gas tank head includes a gas tank cover, a gas tank seat, and a diaphragm. The gas tank cover is fixedly disposed with the gas tank seat, and the diaphragm is located between the gas tank cover and the gas tank seat. The diaphragm includes a straight portion, a corrugated portion, and a fixed portion. Along the radial direction of the gas tank head, the corrugated portion is located between the straight portion and the fixed portion. The fixed portion is fixedly disposed with the gas tank cover and / or the gas tank seat. The gas tank cover is located on the other side of the diaphragm. The diameter of the diaphragm is defined as D1, the outer diameter of the corrugated portion is D2, and the outer diameter of the straight portion is C. D1≤30mm, 1.0≤D2 / C≤2.5.

[0006] According to the thermal expansion valve provided by this utility model, by setting the diameter D1 of the diaphragm of the air box head within the range of D1≤30mm, and the ratio of the corrugated part D2 to the straight part C within the range of 1.0≤D2 / C≤2.5, the diameter of the diaphragm can be reduced, thereby reducing the diameter of the air box head. At the same time, the design of the straight part, corrugated part and fixed part of the diaphragm satisfies the durability of the diaphragm and the opening performance of the thermal expansion valve, realizing the miniaturization of the thermal expansion valve while meeting performance requirements. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of a thermostatic expansion valve provided in one embodiment of the present invention;

[0008] Figure 2 This is another three-dimensional structural schematic diagram of the thermostatic expansion valve provided in one embodiment of the present invention;

[0009] Figure 3 yes Figure 1The diagram shows a structural schematic of a thermostatic expansion valve from another angle.

[0010] Figure 4 yes Figure 3 The diagram shows a cross-sectional view of a thermal expansion valve along the AA direction.

[0011] Figure 5 yes Figure 1 The diagram shows a cross-sectional view of the gas box head of a thermal expansion valve.

[0012] Figure 6 yes Figure 1 The diagram shows a cross-sectional structure of a diaphragm for a thermal expansion valve.

[0013] Figure 7 yes Figure 6 The diagram shows an enlarged view of the structure of the diaphragm at position B of a thermal expansion valve.

[0014] Figure 8 yes Figure 1 The diagram shown is a top view of a diaphragm structure for a thermal expansion valve.

[0015] Figure 9 This is a diagram showing the pressure displacement parameters of the thermostatic expansion valve provided in this embodiment and an existing thermostatic expansion valve.

[0016] 10. Airbox head; 11. Airbox cover; 12. Airbox seat; 13. Diaphragm; 131. Straight part; 132. Corrugated part; 133. Fixing part; 134. Recess; 135. Protrusion; 136. First recess; 137. Second recess; 138. First protrusion; 14. Transmission part; 15. End cap; 20. Valve body; 201. First interface; 202. Second interface; 203. Third interface; 204. Fourth interface; 211. First flow channel; 212. Second flow channel; 213. Third flow channel; 214. Fourth flow channel; 221. First side; 222. Second side; 223. Third side; 224. Fourth side; 231. Top opening; 232. Bottom opening; 241. Valve chamber; 30. Transmission rod assembly; 40. Valve core assembly; 50. Adjustment seat assembly. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit its scope.

[0018] Thermostatic expansion valve is an important automatic control component of refrigeration system. It uses the temperature change of the gas box head (temperature sensing bulb) as a signal to control the axial movement of the valve core through the transmission rod, thereby adjusting the valve opening and realizing the function of changing the refrigerant flow.

[0019] Please refer to Figures 1 to 4 The diagram illustrates the structure of a thermostatic expansion valve, which includes a gas chamber head 10, a valve body 20, a transmission rod assembly 30, a valve core assembly 40, and an adjusting seat assembly 50. The gas chamber head 10 is located at the top of the valve body 20, which has an internal chamber. At least a portion of the transmission rod assembly 30 is located inside the valve body 20 and is situated between the gas chamber head 10 and the valve core assembly 40, providing a driving connection between them. The adjusting seat assembly 50 is located at the bottom of the valve body 20 and includes an adjusting seat 51 and an adjusting spring 52. The valve body 20 has a valve chamber wall forming a valve chamber 241. The adjusting seat 51 is threadedly connected to the valve chamber wall. One end of the adjusting spring 52 abuts against the adjusting seat 51, and the other end abuts against the valve core assembly 40.

[0020] In one embodiment, the valve body 20 includes a first interface 201, a second interface 202, a third interface 203, and a fourth interface 204. The valve body 20 also includes a first flow channel 211, a second flow channel 212, a third flow channel 213, and a fourth flow channel 214. The first interface 201 is one port of the first flow channel 211, the second interface 202 is one port of the second flow channel 212, the third interface 203 is one port of the third flow channel 213, and the fourth interface 204 is one port of the fourth flow channel 214. Fluid enters through the first interface 201, exits through the second interface 202 after the valve core assembly 40 moves axially downward, then enters through the third interface 203 and exits through the fourth interface 204. Alternatively, the second interface 202 and the fourth interface 204 can serve as inlets, and the first interface 201 and the third interface 203 as outlets. The first interface 201, the second interface 202, the third interface 203, and the fourth interface 204 are connected to external pipelines. When the thermostatic expansion valve of this embodiment is used in a thermal management system, the thermal management system includes a compressor, a condenser, and an evaporator. The refrigerant, pressurized by the compressor, liquefies in the condenser and is delivered to the valve body 20 through the first interface 201. Additionally, the refrigerant, after adiabatic expansion within the valve body 20, is sent to the evaporator, where it exchanges heat with the air flowing around the evaporator. The refrigerant returning from the evaporator enters the third flow channel 213 and the fourth flow channel 214 through the third interface 203 and returns to the compressor side.

[0021] Please refer to Figures 1 to 4As shown, the valve body 20 includes a first side portion 221, a second side portion 222, a compressor and a condenser located on the same side as the first side portion 221, an evaporator located on the same side as the second side portion 222, a third side portion 223, and a fourth side portion 224. The first side portion 221 and the third side portion 223 are disposed opposite to each other, and the second side portion 222 and the fourth side portion 224 are disposed opposite to each other. The first interface 201 and the fourth interface 204 are located on the first side portion 221, and the second interface 202 and the third interface 203 are located on the third side portion 223.

[0022] The valve body 20 also has a top opening 231 that extends from the top of the valve body 4 to the bottom of the valve body 20. The air box head 10 is at least partially located in the top opening 231 of the valve body 20. The valve body 20 also has a bottom opening 232 that extends from the bottom of the valve body 20 to the top of the valve body 20. The valve body 20 includes a valve chamber 241. The bottom opening 232 communicates with the valve chamber 241. The valve core assembly 40 is located in the valve chamber 241. A portion of the adjusting seat assembly 50 is located in the valve chamber 241 and is threadedly connected to the valve body 20. In the closed state, the valve chamber 241 communicates with the first flow channel 211.

[0023] The transmission rod assembly 30 is located in the chamber of the valve body 20, and its two ends are respectively connected to the air box head 10 and the valve core assembly 40. That is, the transmission rod assembly 30 can convert the force of the air box head 10 on the transmission rod assembly 30 into the force of the transmission rod assembly 30 on the valve core assembly 40, so that the valve core assembly 40 can move up and down. It should be noted that the air box head 10 may also not be installed on the valve body 20, but may be arranged outside the valve body 20 in the form of a temperature sensing bulb.

[0024] Reference Figure 5 As shown, the air tank head 10 includes an air tank cover 11, an air tank seat 12, a diaphragm 13, a transmission part 14, and a sealing head 15. The air tank cover 11 and the air tank seat 12 are fixedly disposed. The diaphragm 13 is located between the air tank cover 11 and the air tank seat 12, and both ends of the diaphragm 13 are fixedly disposed with respect to the air tank cover 11 and the air tank seat 12. Along the axial direction of the valve body 20, the transmission part 14 is located on the side of the diaphragm 13 near the air tank seat 12, and one end of the transmission part 14 near the air tank cover 11 abuts against the end of the diaphragm 14 near the air tank seat 12. Optionally, along the axial direction of the air tank head, at least a portion of the transmission part 14 is located between the diaphragm 13 and the air tank seat 12, and along the radial direction of the air tank head, there is a gap between the transmission part 14 and the air tank seat 12 that allows the transmission part 14 to move axially.

[0025] Combination Figures 5 to 8As shown, the diaphragm 13 includes a straight portion 131, a corrugated portion 132, and a fixing portion 133. The corrugated portion 132 is located between the straight portion 131 and the fixing portion 133. The fixing portion 133 is fixed between the air box cover 11 and the air box seat 12. The corrugated portion 132 includes N corrugations. From the top view, the corrugated portion 132 is annular. From the cross-section where the center line of the diaphragm 13 is located, the corrugated portion 132 is symmetrically arranged with respect to the center line of the diaphragm 13. The number of corrugations in the corrugated portion 132 is defined as one side of the center line of the diaphragm 13. Adjacent corrugations are connected to each other. N is a positive integer greater than or equal to 2. Under the condition that the diameter of the diaphragm 13 is the same, increasing the number of corrugations will lead to a decrease in the diameter of the straight portion 131, which will lead to an increase in the pressure on the diaphragm 13, which is not conducive to the durability of the diaphragm 13. In order to reduce the pressure on the diaphragm 13 and improve the durability of the diaphragm 13, the number of corrugations can optionally be 2 or 3. In cross-section, the straight part 131 is flat and the fixed part 133 is flat.

[0026] Specifically, the corrugated portion 132 includes recesses 134 and protrusions 135, with the number of corrugations matching the number of recesses 134. One or two protrusions 135 are provided, offering good deformability and easy vertical deformation under stress. This ensures that the axial displacement of the diaphragm 13 under stress is proportional to the applied force within a certain range. The process of the diaphragm 13 moving towards the air box cover 11 under stress until it contacts the air box cover 11 is the upper stroke; the process of the diaphragm 13 moving towards the air box seat 12 under stress until the transmission part 14 contacts the air box seat 12 is the lower stroke. During the upper stroke, the protrusions 135 contact the air box cover 11 first, resulting in a smaller movement at the edge of the diaphragm 13 and improving the durability of the diaphragm 13's edge during the upper stroke. The fixing part 133 is fixedly disposed with the air box cover 11 and / or the air box seat 12. By providing the fixing part 133, when the corrugated part 132 is subjected to force and deforms up and down, the fixing part 133 helps to stabilize the diaphragm 13, so that the diaphragm 13 has better pressure resistance in the air box head 10. The protruding direction of the protrusion 135 faces the air box cover 11, and the concave direction of the recess 134 is away from the air box cover 11.

[0027] It should be noted that when the number of corrugations is 2, the corrugated portion 132 is defined as including a first recess 136 and a second recess 137 in the recess 134, and the corrugated portion 132 is defined as including a first protrusion 138 in the convex portion 135. Along the radial direction of the diaphragm 13, the first protrusion 138 is located between the first recess 136 and the second recess 137, and the first protrusion 138 connects the first recess 136 and the second recess 137. The first recess 136 is located between the first protrusion 138 and the straight portion 131, and the first recess 136 connects the first protrusion 138 and the straight portion 131. The first recess 136 is provided outside the straight portion 131, and the first protrusion 138 is provided outside the first recess 136. By providing the first recess 136, the diaphragm 13 is less likely to come into contact with the gas box cover 11, which helps to extend the life of the thermal expansion valve. Along the radial direction of the diaphragm 13, the second recess 137 is located between the first protrusion 138 and the fixing part 133, and the second recess 137 connects the first protrusion 138 and the fixing part 133. The second recess 137 is provided between the first protrusion 138 and the fixing part 133. By providing the second recess 137, the diaphragm 13 is less likely to come into contact with the gas box cover 11, which helps to extend the life of the thermal expansion valve.

[0028] When the number of corrugations is 3, the corrugated portion 132 includes two protrusions 135 and three recesses 134. Along the radial direction of the diaphragm 13, a recess 134 is provided at each end of the corrugated portion 132. The two protrusions 135 are located in the middle of the corrugated portion 132, and a recess 134 is provided between the two protrusions 135. The two recesses 134 are connected by an arc-shaped protrusion 135, which facilitates the deformation of the diaphragm 13 in the axial direction. The recesses 134 provided between the protrusions 135 and the straight portion 131, such as the first recess 136, can limit the movement of the transmission portion 14 in the direction perpendicular to the axis.

[0029] Viewed from the cross-section of the diaphragm 13's centerline, the first convex portion 138, the first concave portion 136, and the second concave portion 137 are arc-shaped. The straight segment of the flat portion 131 and its extension are on the same straight line as the straight segment of the fixed portion 133 and its extension. Assembling the air box head 10 ensures a better fit between the fixed portion 133 and the diaphragm 13, which is beneficial for controlling the deformation of the diaphragm 13. (Refer to...) Figure 8 Viewed from above, the straight portion 131 is circular, the first protrusion 138, the first concave portion 136 and the second concave portion 137 are annular, and the fixing portion 133 is annular.

[0030] Along the axial direction of the diaphragm 13, the distance between the end of the recess 134 near the air box seat 12 and the end face of the fixing part 133 near the air box seat 12 is H1, and the distance between the end of the protrusion 135 near the air box cover 11 and the end face of the fixing part 133 near the air box cover 11 is H2. H1 is greater than H2, which increases the warpage of the recess 134, improves the stress dispersion effect, and enhances the durability of the edge position of the diaphragm 13 in the lower stroke.

[0031] like Figures 5 to 7 As shown, from the cross-section where the center line of the diaphragm 13 is located, the distance between the center line of the first recess 136 and the center axis of the straight portion 131 is denoted as A, the distance between the center line of the first protrusion 138 and the center axis of the straight portion 131 is denoted as B, the outer diameter of the straight portion 131 is denoted as C, the diameter of the diaphragm 13 is denoted as D1, D1≤30mm, the outer diameter of the corrugated portion 132 or along the radial direction of the diaphragm 13, the distance between the two ends of the connection between the second recess 137 and the fixing portion 133 is D2, 1.0≤D2 / C≤2.5, optionally, 1.4≤D2 / C≤2.1, 20mm≤D2≤23mm, 11.0mm≤C≤14.00mm; optionally, 20.8mm≤D2≤22.2mm, 11.60mm≤C≤13.00mm, 25.1mm≤D1≤26.6mm. The circumferential diameter of the air box head 10 is denoted as D3, and 25.2mm≤D3≤26.7mm. Setting the parameters D1, D2, and C within the above range can ensure the durability of the diaphragm 13 and the opening performance of the thermostatic expansion valve while reducing the diameter of the diaphragm 13 and thus the diameter of the air box head 10.

[0032] Viewed from the cross-section of the diaphragm 13's centerline, the distance between the end of the first protrusion 138 near the air box cover 11 and the end face of the straight portion 131 near the air box cover 11 is denoted as H2. The distance between the end of the first recess 136 and / or the second recess 137 away from the air box cover 11 and the end of the straight portion 131 away from the air box cover 11 is denoted as H1, where H1 is greater than H2. 0mm ≤ H2 ≤ 0.04mm, 0.22mm ≤ H1 ≤ 0.32mm. When the vertical stroke reaches this distance, the diaphragm 13 exhibits good durability.

[0033] Viewed from the cross-section of the diaphragm 13's centerline, the distance between the two ends of the corrugated portion 132, located between the straight section 131 and the fixed portion 133, along the radial direction of the diaphragm 13, is L1, where 4.60mm ≤ L1 ≤ 6.90mm. The diaphragm 13 has three parts: the straight section 131, the corrugated portion 132, and the fixed portion 133. The diaphragm 13 has high overall rigidity, which can increase the contact area between the transmission portion 14 and the diaphragm 13, thereby improving the durability of the diaphragm 13.

[0034] In one embodiment, the diaphragm 13 is made of stainless steel. The diaphragm 13 uses a thin stainless steel plate with a thickness of 0.07 to 0.09 mm. The range of values ​​is as follows: 6.95 mm ≤ A ≤ 7.65 mm, 8.10 mm ≤ B ≤ 8.80 mm, 11.60 mm ≤ C ≤ 13.00 mm, 0.22 mm ≤ H1 ≤ 0.32 mm, 0 ≤ H2 ≤ 0.04 mm, and 25.1 mm ≤ D1 ≤ 26.6 mm. This range ensures that the diameter of the diaphragm 13 is reduced while maintaining its durability and the opening performance of the thermal expansion valve. In the prior art, in order to ensure the durability of the diaphragm 13 and the opening performance of the thermal expansion valve, the diameter of the gas box head 10 is generally between 31 mm and 35 mm. This embodiment can maintain the durability of the diaphragm 13 and the opening performance of the thermal expansion valve while reducing the diameter of the diaphragm 13 and thus the diameter of the gas box head 10.

[0035] Simulation can yield the pressure-displacement curve of diaphragm 13, thus reflecting the performance of diaphragm 13. For example... Figure 9 The figure shows the pressure-displacement curves before the diaphragm 13 is filled. Series 1 is the curve obtained in the prior art with the diameter D3 of the air box head 10 being 32 mm, D2 being 24.5 mm, C being 14.80 mm, plate thickness being 1 mm, and H1 being 0.35 mm. Series 2 to 6 are partial curves within the range of the diaphragm 13 in the embodiments of this application.

[0036] In one embodiment, the diaphragm 13 is made of stainless steel. The diaphragm 13 uses a thin stainless steel plate with a thickness of 0.07 to 0.09 mm. The thickness of the thin steel plate can ensure the durability of the diaphragm 13, with the following parameters: 6.95 mm ≤ A ≤ 7.65 mm, 8.10 mm ≤ B ≤ 8.80 mm, C = 11.80 mm, 0 ≤ H2 ≤ 0.04 mm, 0.24 mm ≤ H1 ≤ 0.30 mm, and 25.1 mm ≤ D1 ≤ 25.6 mm.

[0037] like Figure 9 As shown, in one embodiment, the diaphragm 13 is made of a 0.1 mm thick stainless steel sheet with dimensions D1 = 30 mm, D2 = 26 mm, C = 14 mm, H1 = 0.3 mm, H2 = 0.02 mm, and A = 8.25 mm and 9.5 mm, respectively. The resulting pressure-displacement curve is shown in the figure. Figure 9 As shown in series 7, the diaphragm 13 can reduce its diameter while ensuring its durability and the opening performance of the thermostatic expansion valve.

[0038] like Figure 9As shown, in one embodiment, the diaphragm 13 is composed of stainless steel. The diaphragm 13 uses a thin stainless steel sheet with a thickness of 0.08 mm, D1 = 25.3 mm, C = 11.80 mm, H1 = 0.27 mm, H2 = 0.02 mm, A = 7.05 mm, and B = 8.20 mm. The resulting pressure-displacement curve is shown below. Figure 9 As shown in Series 2, the diaphragm 13 can reduce its diameter while ensuring its durability and the opening performance of the thermostatic expansion valve.

[0039] In one embodiment, the diaphragm 13 is made of a 0.09mm thick stainless steel sheet with dimensions D1=26.6mm, C=13.00mm, H1=0.22mm, H2=0.02mm, A=7.65mm, and B=8.80mm. The resulting pressure-displacement curve is shown below. Figure 9 As shown in series 3.

[0040] In one embodiment, the diaphragm 13 is made of a 0.07mm thick stainless steel sheet with dimensions D1=26.6mm, C=13.00mm, H1=0.32mm, H2=0.02mm, A=7.65mm, and B=8.80mm. The resulting pressure-displacement curve is shown below. Figure 9 As shown in series 4.

[0041] In one embodiment, the diaphragm 13 is made of a 0.09mm thick stainless steel sheet with dimensions D1=25.1mm, C=11.60mm, H1=0.22mm, H2=0.02mm, A=6.95mm, and B=8.10mm. The resulting pressure-displacement curve is shown below. Figure 9 As shown in series 5.

[0042] In one embodiment, the diaphragm 13 is made of a 0.07mm thick stainless steel sheet with dimensions D1=25.1mm, C=11.60mm, H1=0.32mm, H2=0.02mm, A=6.95mm, and B=8.10mm. The resulting pressure-displacement curve is shown below. Figure 9 As shown in series 6.

[0043] from Figure 9As can be seen from the data, the pressure-displacement curves of series 2, series 3, and series 6 obtained according to the parameter range of diaphragm 13 provided in the embodiments of this application are basically consistent with the pressure-displacement curves obtained by the prior art in series 1. They can better ensure the durability and opening performance of diaphragm 13 while miniaturizing the thermostatic expansion valve by reducing the overall diameter of diaphragm 13 in the prior art. The pressure-displacement curves of diaphragm 33 corresponding to the left side of curve 4 and the right side of curve 5 are relatively smoother, and the fluctuation amplitude of displacement with pressure change is more linear, which is beneficial to the flow control of thermostatic expansion valve.

[0044] It should be noted that the above-described embodiments only illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be pointed out that those skilled in the art can make several modifications without departing from the concept of this utility model, and these modifications all fall within the protection scope of this utility model.

Claims

1. A thermostatic expansion valve, characterized in that: The device includes an air tank head (10), which includes an air tank cover (11), an air tank seat (12), and a diaphragm (13). The air tank cover (11) is fixedly disposed with the air tank seat (12), and the diaphragm (13) is located between the air tank cover (11) and the air tank seat (12). The diaphragm (13) includes a straight portion (131), a corrugated portion (132), and a fixing portion (133). Along the radial direction of the air tank head (10), the corrugated portion (132) is located between the straight portion (131) and the fixing portion (133). The fixing portion (133) is fixedly disposed with the air tank cover (11) and / or the air tank seat (12). The air tank cover (11) is located on the other side of the diaphragm (13). The diameter of the diaphragm (13) is defined as D1, the outer diameter of the corrugated part (132) is D2, and the outer diameter of the straight part (131) is C. D1≤30mm, 1.0≤D2 / C≤2.

5.

2. The thermostatic expansion valve according to claim 1, characterized in that: 1.4≤D2 / C≤2.1, 20mm≤D2≤23mm, 11.0mm≤C≤14.00mm.

3. The thermostatic expansion valve according to claim 2, characterized in that: 20.8mm≤D2≤22.2mm, 11.60mm≤C≤13.00mm, 25.1mm≤D1≤26.6mm.

4. The thermostatic expansion valve according to any one of claims 1 to 3, characterized in that: The corrugated portion (132) includes a first protrusion (138), a first recess (136), and a second recess (137). Along the radial direction of the diaphragm (13), the first recess (136) is located on the side of the second recess (137) near the straight portion (131). One end of the first recess (136) is connected to the first protrusion (138), and the other end of the first recess (136) is connected to the straight portion (131). One end of the second recess (137) is connected to the first protrusion (138), and the other end of the second recess (137) is connected to the fixing portion (133). The protruding direction of the first protrusion (138) faces the air box cover (11), and the concave direction of the first recess (136) and the second recess (137) is away from the air box cover (11).

5. The thermostatic expansion valve according to claim 4, characterized in that: In the cross section where the center line of the diaphragm (13) is located, the first protrusion (138), the first concave portion (136) and the second concave portion (137) are arc-shaped, the straight portion (131) is flat, and the fixing portion (133) is flat. Along the axial direction of the diaphragm (13), the straight portion (131) and the fixing portion (133) are located within the same height range.

6. The thermostatic expansion valve according to claim 4, characterized in that: Along the axial direction of the diaphragm (13), the end of the first protrusion (138) near the air box cover (11) is lower than or flush with the end face of the straight portion (131) near the air box cover (11), and the distance between the end of the first protrusion (138) near the air box cover (11) and the end of the straight portion (131) near the air box cover (11) is H2, and the distance between the end of the first recess (136) and / or the second recess (137) away from the air box cover (11) and the end of the straight portion (131) away from the air box cover (11) is H1, where H1 is greater than H2.

7. The thermostatic expansion valve according to claim 6, characterized in that: 0.22mm≤H1≤0.32mm, 0≤H2≤0.04mm.

8. The thermostatic expansion valve according to claim 7, characterized in that: Along the radial direction of the diaphragm (13), the distance between the center line of the first recess (136) and the center axis of the straight portion (131) is denoted as A, and the distance between the center line of the first protrusion (138) and the center axis of the straight portion (131) is denoted as B. 6.95mm≤A≤7.65mm, 8.10mm≤B≤8.80mm; the thickness of the diaphragm (13) is greater than or equal to 0.07mm and less than or equal to 0.09mm.

9. The thermostatic expansion valve according to claim 8, characterized in that: The diaphragm (13) is made of stainless steel and has a thickness of 0.08 mm, D1=25.3 mm, C=11.80 mm, H1=0.27 mm, H2=0.02 mm, A=7.05 mm, and B=8.20 mm.

10. The thermostatic expansion valve according to claim 8, characterized in that: The diaphragm (13) is made of stainless steel and has a thickness of 0.09 mm, wherein D1=26.6 mm, H1=0.22 mm, H2=0.02 mm, A=7.65 mm, B=8.80 mm, C=13.00 mm, or D1=25.1 mm, C=11.60 mm, H1=0.22 mm, H2=0.02 mm, A=6.95 mm, B=8.10 mm.

11. The thermostatic expansion valve according to claim 8, characterized in that: The diaphragm (13) is made of stainless steel and has a thickness of 0.07 mm, wherein D1=26.6 mm, C=13.00 mm, H1=0.32 mm, H2=0.02 mm, A=7.65 mm, B=8.80 mm, or D1=25.1 mm, C=11.60 mm, H1=0.32 mm, H2=0.02 mm, A=6.95 mm, B=8.10 mm.

12. The thermostatic expansion valve according to any one of claims 1 to 11, characterized in that: The thermal expansion valve further includes a valve body (20), which includes a first interface (201), a second interface (202), a third interface (203), and a fourth interface (204). The valve body (20) also includes a first side portion (221), a second side portion (222), a third side portion (223), and a fourth side portion (224). The first side portion (221) is opposite to the third side portion (223), and the second side portion (222) is opposite to the fourth side portion (224). The first interface (201) and the fourth interface (204) are located on the first side portion (221), and the second interface (202) and the third interface (203) are located on the third side portion (204). 223), the valve body (20) includes a first flow channel (211), a second flow channel (212), a third flow channel (213) and a fourth flow channel (214), the first interface (201) is the port of the first flow channel (211), the second interface (202) is the port of the second flow channel (212), the valve body (20) also includes a valve chamber (241), the first flow channel (211) and the second flow channel (212) can be connected through the valve chamber (241), the third interface (203) is the port of the third flow channel (213), the fourth interface (204) is the port of the fourth flow channel (214), the third flow channel (213) and the fourth flow channel (214) are connected.

13. The thermostatic expansion valve according to claim 12, characterized in that: The thermostatic expansion valve further includes a transmission rod assembly (30), a valve core assembly (40), and an adjusting seat assembly (50). The valve body (20) has a top opening (231), and the air box head (10) is at least partially located within the top opening (231). The valve body (20) has a bottom opening (232), and the adjusting seat assembly (50) is located within the bottom opening (232) of the valve body (20). The valve core assembly (40) and the adjusting seat assembly (50) are at least partially located within the valve chamber (241). The transmission rod assembly (30) is at least partially located inside the valve body (20). The transmission rod assembly (30) drives the air box head (10) and the valve core assembly (40) to move. The air box head (10) enables the transmission rod assembly (30) to drive the valve core assembly (40) to move.

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