Thermal expansion valve

Abstract

A mounting seat comprises a first stepped hole part with a downward stepped surface, a plugging piece comprises a first stepped part with an upward stepped surface, the first stepped part is located in the first stepped hole part, and the first stepped part and the first stepped surface of the first stepped hole part directly or indirectly abut against each other for sealing in the longitudinal direction of the thermal expansion valve. The sealing reliability of the thermostatic expansion valve can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to a thermal expansion valve. Background Art

[0002] Thermal expansion valves are commonly found in air conditioning systems and can regulate the refrigerant flow in the system.

[0003] Figure 1 The present invention is a cross-sectional schematic diagram of a thermal expansion valve of the background technology.

[0004] like Figure 1 As shown, the thermal expansion valve includes a valve body component 01, a valve core 02, and an adjusting component 03. The valve body component 01 includes a valve body 011, an inlet pipe 012, an outlet pipe 013, and a valve cap 014. The valve body 011 includes a valve port 0111. After the fluid flows into the inlet pipe 012, it flows out from the outlet pipe 013 through the valve port 0111. The valve core 02 is arranged in the valve body 011 and can be displaced relative to the valve port 0111. The adjusting component 03 includes an adjusting seat 031, a spring 032, support member 033, support member 033 supports valve core 02, one end of spring 032 abuts against support member 033, the other end of spring 032 abuts against adjustment seat 031, adjustment seat 031 is threadedly connected with valve body 011, by twisting the straight hole 0311 at the lower end of adjustment seat 031, adjustment seat 031 can be displaced along the longitudinal direction of thermal expansion valve relative to valve body 011, so that valve core 02 can be displaced relative to valve mouth 0111 to set the static superheat of thermal expansion valve. After adjusting the static superheat of thermal expansion valve with this structure, valve cap 014 needs to be tightened, valve cap 014 covers part of valve body 011, valve cap 014 is provided with tip 0141, valve body 011 is provided with inclined portion 0112, after valve cap 014 is tightened, tip 0141 abuts against inclined portion 0112 to seal.

[0005] In this design, since the valve bonnet 014 partially covers the valve body 011, when the valve bonnet 014 is hit, the valve bonnet 014 is directly subjected to force, which may affect the sealing reliability of the abutment between the tip 0141 and the inclined portion 0112. This thermal expansion valve has room for improvement. Summary of the invention

[0006] The object of the present invention is to provide a thermal expansion valve, comprising a valve body component, a valve core component, and an adjusting component, wherein the valve body component comprises a valve body and a mounting seat, the valve body component comprises a valve mouth portion, the valve core component comprises a valve core, the valve core and the adjusting component are located in a valve cavity of the thermal expansion valve, along the longitudinal direction of the thermal expansion valve, the mounting seat supports the adjusting component, the adjusting component supports the valve core, and the adjusting component is capable of adjusting the displacement of the valve core relative to the valve mouth portion; the thermal expansion valve also comprises a blocking component, the blocking component is detachably fixedly connected to the mounting seat, the mounting seat comprises a first step hole portion with a step surface facing downward, the blocking component comprises a blocking member, the blocking member comprises a first step portion with a step surface facing upward, the first step portion is located in the first step hole portion, along the longitudinal direction of the thermal expansion valve, the first step portion and the first step surface of the first step hole portion are directly or indirectly sealed against each other.

[0007] The thermal expansion valve of the present application, the mounting seat includes a first step hole portion with a step surface facing downward, the sealing member includes a first step portion with a step surface facing upward, the first step portion is located in the first step hole portion, and along the longitudinal direction of the thermal expansion valve, the first step portion and the first step surface of the first step hole portion are directly or indirectly abutted and sealed, which can improve the sealing reliability of the thermal expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A cross-sectional schematic diagram of a thermal expansion valve is provided as background technology;

[0009] Figure 2 A cross-sectional schematic diagram of the thermal expansion valve provided by the present invention;

[0010] Figure 3 for Figure 2 A local enlarged schematic diagram of point I in the middle;

[0011] Figure 4 It is a schematic diagram of the cooperation between the mounting seat and some adjusting components;

[0012] Figure 5 for Figure 4 A schematic diagram of the structure of the middle adjustment component;

[0013] Figure 6 for Figure 4 A top view of

[0014] Figure 7 This is a schematic structural diagram of another blocking component provided by the present invention.

[0015] Figure 2-Figure 7 The reference numerals in the figures are described as follows:

[0016] 1-valve body component, 10-valve cavity, 11-valve body, 111-valve port;

[0017] 12-mounting seat, 121-lower end surface of the mounting seat;

[0018] 122-first step hole portion, 123-first large diameter hole section, 124-first small diameter hole section;

[0019] 1241-first internal thread portion, 125-first step surface, 126-second step hole portion;

[0020] 127-limiting hole section, 128-second large diameter hole section, 129-second small diameter hole section;

[0021] 130-third step surface, 131-second step surface, 2-valve core component, 21-valve core;

[0022] 3-adjusting component, 31-adjusting rod, 311-base, 3111-second blind hole;

[0023] 3112-lower end surface of the base, 3113-second step portion;

[0024] 3114 - step wall of the second step portion, 3115 - step surface of the second step portion;

[0025] 312-rod portion, 3121-second external thread portion, 3122-extrusion deformation portion;

[0026] 32-spring seat, 320-through hole, 321-second internal threaded portion, 322-seat portion, 323-extension portion;

[0027] 33-limiting member, 34-sealing member, 35-bearing member, 351-recess, 36-spring;

[0028] 4 / 4A-blocking component, 41 / 41A-blocking piece, 411 / 411A-large diameter section;

[0029] 4111 / 4111A-lower end surface of the large diameter section, 4113-annular convex portion;

[0030] 4114-first blind hole, 412 / 412A-small diameter section, 4121-first external threaded portion;

[0031] 413 - first step portion, 4131 - step surface of the first step portion, 42 - gasket. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] The directional words such as "upper" and "lower" involved in this article are attached Figure 2 The positions of the components shown in the figure are defined only for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application; it should also be understood that the structural relationships such as connection, fixation, abutment, etc. described in this article, unless otherwise specified to reflect the inventive concept, should include direct and indirect methods.

[0034] The words "first", "second", etc. mentioned in this article are only for the convenience of describing two or more structures or components with the same or similar structures and / or functions, and do not imply any special limitation on the order and / or importance.

[0035] Please refer to Figure 2-Figure 6 , Figure 2 A cross-sectional schematic diagram of the thermal expansion valve provided by the present invention; Figure 3 for Figure 2 A local enlarged schematic diagram of point I in the middle; Figure 4 It is a schematic diagram of the cooperation between the mounting seat and some adjusting components; Figure 5 for Figure 4 A schematic diagram of the structure of the middle adjustment component; Figure 6 for Figure 4 Top view of the .

[0036] The present invention provides a thermal expansion valve, which is mainly used in refrigeration cycle systems such as air conditioning systems and can be used to adjust the flow rate of refrigerant. Figure 2 As shown, the thermal expansion valve includes a valve body component 1, a valve core component 2, and an adjusting component 3.

[0037] The valve body component 1 constitutes the main structure of the thermal expansion valve and can form the installation position of other components. As shown in Figure 2, the valve body component 1 includes a valve body 11 and a mounting seat 12. The valve body 11 and the mounting seat 12 are fixedly connected. In this embodiment, the valve body 11 and the mounting seat 12 are fixed by screwing, and the valve body 11 includes a valve mouth 111. The valve core component 2 includes a valve core 21, and the valve core 21 is located in the valve cavity 10 of the thermal expansion valve. The mounting seat 12 is cylindrical, and the adjustment component 3 is located in the valve cavity 10 of the thermal expansion valve. Along the longitudinal direction of the thermal expansion valve, the mounting seat 12 supports the adjustment component 3, and the adjustment component 3 supports the valve core 21. By adjusting the displacement of the adjustment component 3 along the longitudinal direction of the thermal expansion valve, the displacement of the valve core 21 relative to the valve mouth 111 can be adjusted. In this way, the static superheat of the thermal expansion valve can be adjusted according to the result of system operation.

[0038] In this embodiment, Figure 2 , Figure 3 , Figure 4As shown, the thermal expansion valve further includes a plugging component 4, which is detachably fixedly connected to the mounting seat 12. When the static superheat of the thermal expansion valve needs to be adjusted, the plugging component 4 is removed, so that the displacement of the adjusting component 3 along the longitudinal direction of the thermal expansion valve can be adjusted. After the adjustment, the plugging component 4 is fixedly connected to the mounting seat 12. The mounting seat 12 includes a first step hole portion 122 with a step surface facing downward, and the plugging component 4 includes a plugging member 4, which is at least partially located in the first step hole portion 122. Specifically, the plugging member 4 includes a first step portion 413 with a step surface facing upward, and the first step portion 413 is located in the first step hole portion 122. Along the longitudinal direction of the thermal expansion valve, the first step portion 413 directly or indirectly abuts against and seals the first step surface 125 of the first step hole portion 122.

[0039] In this arrangement, since the first step portion 413 that abuts and seals the first step surface 125 is located in the first step hole portion 122, the sealing portion is not easily affected by external impact, that is, the sealing portion is protected by the mounting seat 12, thereby ensuring the sealing reliability of the abutting portion, thereby improving the sealing reliability of the thermal expansion valve.

[0040] Specifically, combined Figure 3 , Figure 4 The first step hole portion 122 includes a first large diameter hole section 123, a first small diameter hole section 124 and the above-mentioned first step surface 125. The first step surface 125 connects the first large diameter hole section 123 and the first small diameter hole section 124. Along the longitudinal direction of the thermal expansion valve, the first large diameter hole section 123 is located below the first small diameter hole section 124. The sealing member 41 is in the shape of a bolt, and includes a large diameter section 411 and a small diameter section 412. The large diameter section 411 is located in the first large diameter hole section 123. The lower end surface 4111 of the large diameter section 411 does not protrude from the lower end surface 121 of the mounting seat 12. The small diameter section 412 is at least partially located in the first small diameter hole section 124. The large diameter section 411 and the small diameter section 412 form the above-mentioned first step portion 413. The first step portion 413 includes an annular protrusion 4113. The annular protrusion 4113 protrudes upward from the step surface 4131 of the first step portion 413 along the axial direction of the mounting seat 12. Along the axial direction of the mounting seat 12, the annular protrusion 4113 abuts against the first step surface 125 to achieve sealing.

[0041] Figure 7 This is a schematic structural diagram of another blocking component provided by the present invention.

[0042] Combination Figure 3 , Figure 7The blocking component 4A of this embodiment includes a blocking component 41A and a gasket 42. The blocking component 41A includes a large diameter section 411A and a small diameter section 412A. The large diameter section 411A is located in the first large diameter hole section 123. The lower end surface 4111A of the large diameter section 411A does not protrude from the lower end surface 121 of the mounting seat 12. The small diameter section 412A is located in the first small diameter hole section 124. The large diameter section 411A and the small diameter section 412A constitute the above-mentioned first step portion 413A. The gasket 42 is annular. The gasket 42 is covered with the small diameter section 412A. Along the axial direction of the mounting seat 12, the step surface 4131A of the first step portion 413A abuts against the gasket 42. The gasket 42 abuts against the first step surface 125 to achieve sealing.

[0043] In this embodiment, the mounting seat 12, the plugging member 41A and the gasket 42 are made of metal, and the hardness of the gasket 42 is lower than that of the mounting seat 12 and / or the plugging member 41A. With this arrangement, the gasket 42 is easily deformed after being squeezed by the mounting seat 12 and the plugging member 41A, which can improve the sealing reliability.

[0044] Furthermore, the aforementioned "detachably fixed connection" is specifically a threaded connection. As a specific embodiment, Figure 3 As shown, the hole wall of the first small diameter hole section 124 includes a first internal threaded portion 1241, and the outer wall of the small diameter section 412 includes a first external threaded portion 4121. The first internal threaded portion 1241 is threadedly matched with the first external threaded portion 4121, that is, the plugging member 41 is fixed to the sealing seat 12 by threads. During the thread tightening process of the plugging member 41, the annular protrusion 4113 in the first embodiment mentioned above continuously presses the first step surface 125, or the gasket 42 in the second embodiment mentioned above continuously presses the first step surface 125, thereby improving the sealing reliability. On the other hand, the large diameter section 411 includes a first blind hole 4114, the orifice of the first blind hole 4114 is located at the lower end surface 4111 of the large diameter section 411, and the cross-sectional profile of the first blind hole 4114 is non-circular. Such a configuration facilitates the insertion of an external tool into the first blind hole 4114 to thread tighten the plugging member 41.

[0045] Combination Figure 4 , Figure 5The adjusting component 3 is located above the blocking component 4. The adjusting component 3 specifically includes an adjusting rod 31 and a spring seat 32. The spring seat 32 has a through hole 320. The adjusting rod 31 is penetrated by the through hole 320, and the adjusting rod 31 is threadedly connected with the spring seat 32. By rotating the adjusting rod 31, the spring seat 32 can move axially relative to the adjusting rod 31 along the mounting seat 12. The mounting seat 12 further includes a second step hole portion 126 with the step surface facing upward. Along the axial direction of the mounting seat 12, the second step hole portion 126 is located above the first step hole portion 122. The second step hole portion 126 includes a limiting hole section 127. The cross-sectional profile of the limiting hole section 127 is non-circular. The spring seat 32 includes a seat portion 322 that cooperates with the limiting hole section 127. The seat portion 322 is at least partially located in the limiting hole section 127. The cross-sectional profile of the seat portion 322 is non-circular. The inner wall of the limiting hole section 127 cooperates with the outer wall of the seat portion 322 to limit the circumferential rotation of the spring seat 32 relative to the mounting seat 12. In this embodiment, Figure 6 As shown, the limiting hole section 127 is an inner hexagonal hole, and the seat portion 322 is an outer hexagonal structure.

[0046] Further, such as Figure 4 As shown, the second stepped hole portion 126 also includes a second large diameter hole section 128 and a second small diameter hole section 129, the above-mentioned limiting hole section 127 is located above the second large diameter hole section 128, the second small diameter hole section 129 is located below the second large diameter hole section 128, and the second small diameter hole section 129 is located above the first small diameter hole section 124. The above-mentioned regulating rod 31 specifically includes a base 311 and a rod 312, the maximum outer edge diameter of the base 311 is greater than the maximum outer edge diameter of the rod 312, the base 311 is at least partially located in the second small diameter hole section 129, the outer wall of the rod 312 includes a second external threaded portion 3121, and the hole wall forming the through hole 320 includes a second internal threaded portion 321, and the second external threaded portion 3121 is screwed with the second internal threaded portion 321. The upper section of the rod 312 includes a limiting portion, which can limit the spring seat 32 from upwardly separating from the rod 312, so as to prevent the displacement function of the regulating valve core 21 of the regulating component 3 from failing.

[0047] Further, such as Figure 5 As shown, the upper section of the rod 312 includes an extrusion deformation portion 3122, which is formed by extrusion of part of the second external thread portion 3121, and the extrusion deformation portion 3122 serves as the above-mentioned limiting portion. In the actual assembly process, the adjusting rod 31 and the spring seat 32 are first screwed together through threads, and then the second external thread portion 3121 of the upper section of the rod 312 is squeezed to deform part of the second external thread portion 3121. In this way, the spring seat 32 will not be screwed out upward through the threads. The structure is simple and easy to process.

[0048] Of course, in order to facilitate the external tool to screw the adjustment rod 31, the base 311 of the adjustment rod 31 includes a second blind hole 3111, the orifice of the second blind hole 3111 is located at the lower end surface 3112 of the base 311, and the cross-sectional profile of the second blind hole 3111 is non-circular. In this embodiment, the second blind hole 3111 is specifically a hexagonal hole. Further, the orthographic projection of the first small-diameter hole section 124 along the longitudinal direction of the thermal expansion valve can cover the orthographic projection of the second blind hole 3111 along the longitudinal direction of the thermal expansion valve, that is, the inner diameter of the first small-diameter hole section 124 is larger than the inner diameter of the second blind hole 3111. With this arrangement, when the external tool screws the adjustment rod 31, the first small-diameter hole section 124 will not interfere.

[0049] Further, such as Figure 4 As shown, the inner diameter of the second small-diameter hole section 129 is greater than the inner diameter of the first small-diameter hole section 124, and the mounting seat 12 further includes a third step surface 130 connecting the first step hole portion 122 and the second step hole portion 126. The base 311 of the adjustment rod 31 is placed on the third step surface 130, and the third step surface 130 can limit the downward displacement of the adjustment rod 31 along the axial direction of the mounting seat 12.

[0050] Furthermore, if Figure 4 , Figure 5 As shown, the second large diameter hole section 128 is located between the limiting hole section 127 and the second small diameter hole section 129. The adjusting component 3 also includes a limiting member 33, which is in a circular ring shape, and the limiting member 33 is covered with a rod portion 312, and the limiting member 33 is at least partially located in the second large diameter hole section 128. The limiting member 33 is fixedly connected to the mounting seat 12. In this embodiment, the two are fixed by riveting, and the limiting member 33 can limit the axial upward displacement of the adjusting rod 31 along the mounting seat 12.

[0051] Through the above arrangement, the axial displacement of the adjusting rod 31 along the mounting seat 12 is limited, that is, the adjusting rod 31 can be twisted by an external tool, but the adjusting rod 31 will not move axially too much and separate from the mounting seat 12, thereby affecting the adjustment function of the adjusting component 3.

[0052] As a specific implementation scheme, Figure 4 and Figure 5As shown, the base 311 of the adjustment rod 31 includes a second step portion 3113 with a step surface facing upward, and the adjustment component 3 also includes a seal 34, which is annular and is sleeved on the step wall 3114 of the second step portion 3113. As an exemplary illustration, the seal 34 is made of rubber or plastic, and elastically abuts between the step wall 3114 of the second step portion 3113 and the hole wall of the second small-diameter hole section 129. The seal 34 acts as a first seal to prevent the refrigerant from leaking out. The step surface 3115 of the second step portion 3113 can limit the downward displacement of the seal 34 along the axial direction of the mounting seat 12.

[0053] like Figure 4 As shown, the second step hole portion 126 also includes a second step surface 131 connecting the second large diameter hole section 128 and the second small diameter hole section 129. The above-mentioned limit member 33 is placed on the second step surface 131. The limit member 33 is located above the sealing member 34. The limit member 33 can limit the axial upward displacement of the sealing member 34 along the mounting seat 12.

[0054] Through the above arrangement, the displacement of the limiting member 33 along the axial direction of the mounting seat 12 is limited. Figure 4 As shown, the limiting member 33 is restricted in the second small-diameter hole section 129 , which can improve the sealing reliability of the limiting member 33 .

[0055] Please continue to refer to Figure 2 In the embodiment of the accompanying drawings, the regulating component 3 further includes a bearing member 35 and a spring 36. The bearing member 35 has a recessed portion 351 with an opening facing upward, and the lower end of the valve core 21 is adapted to the recessed portion 351. One end of the spring 36 abuts against the bearing member 35, and the other end of the spring 36 abuts against the seat portion 322 of the spring seat 32. The spring seat 32 further includes an extension portion 323 extending upward from the seat portion 322 along the axial direction of the mounting seat 12. The spring 36 is sheathed over the extension portion 323. The spring 36 is limited in the radial direction of the mounting seat 12 by providing the extension portion 323, thereby improving the working stability of the spring 36.

[0056] The above is only a specific implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A thermal expansion valve, characterized in that: The thermal expansion valve comprises a valve body component, a valve core component, and an adjusting component, wherein the valve body component comprises a valve body and a mounting seat, the valve body component comprises a valve port, the valve core component comprises a valve core, the valve core and the adjusting component are located in a valve cavity of the thermal expansion valve, along the longitudinal direction of the thermal expansion valve, the mounting seat supports the adjusting component, the adjusting component supports the valve core, and the adjusting component can adjust the displacement of the valve core relative to the valve port; The thermal expansion valve also includes a sealing component, which is detachably fixedly connected to the mounting seat, and the mounting seat includes a first step hole portion with a step surface facing downward. The sealing component includes a sealing piece, and the sealing piece includes a first step portion with a step surface facing upward. The first step portion is located in the first step hole portion, and along the longitudinal direction of the thermal expansion valve, the first step portion and the first step surface of the first step hole portion are directly or indirectly abutted and sealed.

2. The thermal expansion valve according to claim 1, characterized in that: The mounting seat is cylindrical, the first step hole portion includes a first large diameter hole section, a first small diameter hole section and the first step surface, the first step surface connects the first large diameter hole section and the first small diameter hole section, the blocking member includes a large diameter section and a small diameter section, the large diameter section is located in the first large diameter hole section, the lower end surface of the large diameter section does not protrude from the lower end surface of the mounting seat, the small diameter section is at least partially located in the first small diameter hole section, the large diameter section and the small diameter section form the first step portion, the first step portion includes an annular protrusion, the annular protrusion protrudes upward from the step surface of the first step portion along the axial direction of the mounting seat, and the annular protrusion abuts against the first step surface along the axial direction of the mounting seat.

3. The thermal expansion valve according to claim 1, characterized in that: The mounting seat is cylindrical, the first step hole portion includes a first large diameter hole section, a first small diameter hole section and the first step surface, the first step surface connects the first large diameter hole section and the first small diameter hole section, the blocking component includes a large diameter section and a small diameter section, the large diameter section is located in the first large diameter hole section, the lower end surface of the large diameter section does not protrude from the lower end surface of the mounting seat, the small diameter section is at least partially located in the first small diameter hole section, the large diameter section and the small diameter section form the first step portion, the blocking component also includes a gasket, the gasket is annular, the gasket sleeves the small diameter section, along the axial direction of the mounting seat, the step surface of the first step portion abuts against the gasket, and the gasket abuts against the first step surface.

4. The thermal expansion valve according to claim 3, characterized in that: The mounting seat, the blocking member, and the gasket are made of metal, and the hardness of the material of the gasket is smaller than that of the mounting seat and / or the blocking member.

5. The thermal expansion valve according to any one of claims 2 to 4, characterized in that: The hole wall of the first small-diameter hole section includes a first internal threaded portion, the outer wall of the small-diameter section includes a first external threaded portion, the first internal threaded portion is threadedly matched with the first external threaded portion, the large-diameter section includes a first blind hole, the orifice of the first blind hole is located at the lower end surface of the large-diameter section, and the cross-sectional profile of the first blind hole is non-circular.

6. The thermal expansion valve according to claim 1, characterized in that: The mounting seat also includes a second step hole portion with a step surface facing upward, the second step hole portion is located above the first step hole portion, the second step hole portion includes a second large-diameter hole section, the adjusting component is located above the blocking component, the adjusting component includes an adjusting rod and a limiting member, the limiting member is sleeved around the adjusting rod, the limiting member is at least partially located in the second large-diameter hole section, the limiting member is fixedly connected to the mounting seat, and the limiting member can limit the axial upward displacement of the adjusting rod along the mounting seat.

7. The thermal expansion valve according to claim 6, characterized in that: The second step hole portion further includes a second small-diameter hole section, the second small-diameter hole section is located below the second large-diameter hole section, the adjustment rod includes a second step portion with a step surface facing upward, the adjustment component further includes a sealing member, the sealing member is annular, the material of the sealing member is rubber or plastic, the sealing member is sleeved on the step wall of the second step portion, the sealing member elastically abuts between the step wall of the second step portion and the hole wall of the second small-diameter hole section, and the step surface of the second step portion can limit the axial downward displacement of the sealing member along the mounting seat; The second stepped hole portion also includes a second stepped surface connecting the second large-diameter hole section and the second small-diameter hole section. The limiting member is disposed on the second stepped surface. The limiting member is located above the sealing member. The limiting member can limit the axial upward displacement of the sealing member along the mounting seat.

8. The thermal expansion valve according to claim 7, characterized in that: The adjusting component also includes a spring seat, which has a through hole. The adjusting rod includes a base and a rod. The maximum outer edge diameter of the base is larger than the maximum outer edge diameter of the rod. The base is at least partially located in the second small-diameter hole section. The second step portion is located at the base. The limiter sleeves the rod. The outer wall of the rod includes a second external threaded portion. The hole wall forming the through hole includes a second internal threaded portion. The second external threaded portion is screwed with the second internal threaded portion. The upper section of the rod includes a limiting portion, which can limit the spring seat from upwardly detaching from the rod.

9. The thermal expansion valve according to claim 8, characterized in that: The upper section of the rod portion includes an extrusion deformation portion, the extrusion deformation portion is formed by extruding a portion of the second external thread portion, and the extrusion deformation portion serves as the limiting portion; The base comprises a second blind hole, the opening of the second blind hole is located at the lower end surface of the base, and the cross-sectional profile of the second blind hole is non-circular.

10. The thermal expansion valve according to claim 8, characterized in that: The mounting seat further comprises a third step surface connecting the first step hole portion and the second step hole portion, the base is disposed on the third step surface, and the third step surface can limit the downward displacement of the adjustment rod along the axial direction of the mounting seat.

11. The thermal expansion valve according to claim 8, characterized in that: The second step hole portion also includes a limiting hole segment, which is located above the second large-diameter hole segment, and the cross-sectional profile of the limiting hole segment is non-circular. The spring seat includes a seat portion, which is at least partially located in the limiting hole segment, and the cross-sectional profile of the seat portion is non-circular. The inner wall of the limiting hole segment cooperates with the outer wall of the seat portion to limit the circumferential rotation of the spring seat relative to the mounting seat.

12. The thermal expansion valve according to claim 11, characterized in that: The regulating component also includes a bearing member and a spring, the bearing member has a recess, the lower end of the valve core is adapted to the recess, one end of the spring is against the bearing member, and the other end of the spring is against the seat, and the spring seat also includes an extension portion extending upward from the seat along the axial direction of the mounting seat, the spring sleeve is wrapped around the extension portion, and the extension portion can limit the radial displacement of the spring.

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