Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve seat portion, a valve core portion, a valve core portion, a valve core portion, a valve core portion, a valve core portion, a valve core portion, a valve core portion and a valve core portion, and is characterized in that the valve seat portion is provided with a connector close to the end of the valve seat portion; the silencing assembly is arranged in the connecting opening, and the limiting part can axially limit the silencing assembly; and the connecting pipe is arranged on the outer side of the connecting opening in a sleeving mode, and filling materials are arranged between the limiting part and the connecting pipe. By means of the technical scheme, the problem that in the prior art, a silencing assembly is extremely prone to falling off from the interior of a connecting opening can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, and more specifically, to an electronic expansion valve. Background Art

[0002] An electronic expansion valve is a throttling element for regulating the refrigerant flow rate. As Figure 1 shown, the electronic expansion valve has a valve seat portion 100 and a connecting pipe 200. A valve port and a connecting port 110 are sequentially communicated on the valve seat portion. The connecting port 110 is close to the end of the valve seat portion 100. A silencing component 300 is arranged at the connecting port 110. The silencing component 300 can eliminate the noise generated when the fluid flows through the valve port. The connecting pipe 200 is sleeved outside the connecting port 110.

[0003] Among them, in the related art, the silencing component is usually limited by reducing the inner diameter of the end of the connecting port. However, with such a setting, there is a gap between the end of the connecting port and the connecting pipe, and there is no filling material between the end of the connecting port and the connecting pipe. The end of the connecting port is extremely prone to deformation, resulting in the silencing component falling off from the connecting port. Summary of the Utility Model

[0004] The utility model provides an electronic expansion valve to solve the problem that the silencing component in the prior art is extremely prone to falling off from the connecting port.

[0005] The utility model provides an electronic expansion valve, which includes: a valve seat portion having a connecting port provided at the end close to the valve seat portion, and a limiting portion at the end of the valve seat portion; a silencing component arranged in the connecting port, and the limiting portion can axially limit the silencing component; a connecting pipe sleeved outside the connecting port, and there is a filling material between the limiting portion and the connecting pipe.

[0006] Further, the limiting portion includes a limiting protrusion, the limiting protrusion is inclined towards the direction close to the center line of the valve seat portion, and there is a filling material between the outer side wall of the limiting protrusion and the inner wall of the connecting pipe.

[0007] Further, the limiting protrusion is fixedly welded to the connecting pipe, and there is solder between the outer side wall of the limiting protrusion and the inner wall of the connecting pipe.

[0008] Further, there is a gap between the outer side wall of the limiting protrusion and the inner wall of the connecting pipe. The valve seat portion includes a main body section and a connecting section. The diameter of the connecting section is smaller than that of the main body section. There is a first stepped surface between the main body section and the connecting section. A placement portion is provided between the first stepped surface and the outer side wall of the connecting pipe. The connecting section has a connecting port, the connecting pipe is sleeved on the connecting section, and there is a gap between the outer side wall of the connecting section and the inner wall of the connecting pipe. One end of the gap communicates with the placement portion, and the other end of the gap communicates with the interval. The placement portion is used for placing a welding ring.

[0009] Furthermore, the gap between the outer wall of the connecting section and the inner wall of the connecting pipe is set between 0.005 mm and 0.1 mm.

[0010] Furthermore, the angle between the limiting protrusion and the center line of the valve seat portion is set between 10° and 45°.

[0011] Furthermore, the outer wall of the limiting portion and the inner wall of the connecting pipe are fixed by brazing.

[0012] Furthermore, the inner side and / or the outer side of the end of the connecting pipe close to the valve seat portion has a chamfer.

[0013] Furthermore, the connecting pipe has a first straight section, a transition section and a second straight section connected in sequence. The first straight section is sleeved outside the connecting port. The diameter of the second straight section is smaller than that of the first straight section. The diameter of the transition section gradually decreases in the direction close to the second straight section.

[0014] Furthermore, the end of the connecting port away from the limiting portion has a second stepped surface. The silencing component includes: a first silencing member disposed in the connecting port, one end of the first silencing member abuts against the second stepped surface; a fixing sleeve, one end of the fixing sleeve abuts against the other end of the first silencing member, and the second stepped surface and the fixing sleeve cooperate to axially limit the first silencing member. A fixing groove is provided at the other end of the fixing sleeve; a second silencing member is disposed in the fixing groove.

[0015] Furthermore, the limiting protrusion is a riveting protrusion, the placing portion is a placing groove, the placing groove is provided on the first stepped surface, and the placing groove is used for placing a welding ring.

[0016] Applying the technical solution of the present utility model, the silencing component is disposed in the connecting port. The limiting portion at the end of the valve seat portion can limit the silencing component to prevent the silencing component from moving, and there is a filling material in the gap between the limiting portion and the connecting pipe. With the above structure, the filling material fills the gap between the limiting portion and the connecting pipe. The filling material can support the limiting portion to prevent the limiting portion from deforming, thereby ensuring the limiting effect of the limiting portion, preventing the silencing component from falling off from the connecting port, improving the service life of the valve seat portion, and ensuring the normal operation of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0018] Figure 1 Shows a partial structural schematic diagram of an electronic expansion valve provided by the prior art;

[0019] Figure 2Shows a partial structural schematic diagram of the electronic expansion valve provided by the present utility model;

[0020] Figure 3 Shows a structural schematic diagram of the welding ring and the placement groove provided by the present utility model;

[0021] Figure 4 Shows Figure 3 The partial enlarged view at position A in

[0022] Figure 5 Shows a structural schematic diagram of the welding ring and the gap provided by the present utility model.

[0023] Among them, the above-mentioned drawings include the following reference numerals:

[0024] 10. Valve seat part;

[0025] 11. Valve port;

[0026] 12. Connection port; 121. Second stepped surface;

[0027] 13. Limit projection;

[0028] 14. Main body section; 15. Connection section;

[0029] 16. First stepped surface; 161. Placement groove;

[0030] 20. Sound absorption component;

[0031] 21. First sound absorption part; 211. Flow hole;

[0032] 22. Fixed sleeve; 221. Through hole;

[0033] 23. Second sound absorption part;

[0034] 30. Connecting pipe;

[0035] 31. Spacing; 32. Gap;

[0036] 33. Chamfer;

[0037] 34. First straight section; 35. Transition section; 36. Second straight section;

[0038] 40. Valve needle assembly;

[0039] 1. Welding ring; 2. Solder;

[0040] 100. Valve seat part; 110. Connection port; 200. Connecting pipe; 300. Sound absorption component; 400. Solder. Detailed implementation manner

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0042] As Figures 2 to 5 shown, an embodiment of the present utility model provides an electronic expansion valve, which includes a valve seat portion 10, a silencing component 20, and a connecting pipe 30. The valve seat portion 10 has a connecting port 12, and the connecting port 12 is arranged near the end of the valve seat portion 10. The end of the valve seat portion 10 has a limiting portion. The silencing component 20 is arranged in the connecting port 12, and the limiting portion can axially limit the silencing component 20. The connecting pipe 30 is sleeved outside the connecting port 12, and there is a filling material between the limiting portion and the connecting pipe 30.

[0043] Applying the technical solution of the present application, the silencing component 20 is arranged in the connecting port 12, and the limiting portion at the end of the valve seat portion 10 can limit the silencing component 20 to prevent the silencing component 20 from moving around. Moreover, there is a filling material in the gap between the limiting portion and the connecting pipe 30. With the above structure, the filling material fills the gap between the limiting portion and the connecting pipe 30. The filling material can support the limiting portion to prevent the limiting portion from deforming, thereby ensuring the limiting effect of the limiting portion, preventing the silencing component 20 from falling off from the connecting port 12, improving the service life of the valve seat portion 10, and ensuring the normal operation of the electronic expansion valve.

[0044] Among them, in the present application, the valve seat portion 10 further has a valve port 11, and the valve port 11 and the connecting port 12 are connected in sequence.

[0045] Among them, in the present application, the electronic expansion valve further includes a valve needle assembly 40. The valve needle assembly 40 can block and open the valve port 11, and the silencing component 20 can reduce the noise generated when the fluid flows through the valve port 11.

[0046] As Figure 2 shown, the limiting portion includes a limiting protrusion 13. The limiting protrusion 13 is inclined towards the direction close to the center line of the valve seat portion 10, and there is a filling material between the outer side wall of the limiting protrusion 13 and the inner wall of the connecting pipe 30. With such a setting, it is convenient to process the limiting portion, the structure is simple, and at the same time, there is no need to set additional components at the connecting port 12 of the valve seat portion 10, reducing the use of components.

[0047] Optionally, the filling material can be an elastic member made of rubber material or a polyurethane foaming agent.

[0048] As Figure 1 shown, in the related art, the solder 400 is not filled between the end of the connection port 110 and the connection pipe 200, there is a gap between the end of the connection port 110 and the connection pipe 200, and the end of the connection port 110 is extremely likely to be deformed.

[0049] As Figure 2 shown, in the present application, the limiting protrusion 13 is fixedly welded to the connection pipe 30, and there is solder 2 between the outer side wall of the limiting protrusion 13 and the inner wall of the connection pipe 30. With such a setting, there is solder 2 between the outer side wall of the limiting protrusion 13 and the inner wall of the connection pipe 30. Therefore, there is no gap between the outer side wall of the limiting protrusion 13 and the inner wall of the connection pipe 30, and the solder 2 can support the limiting protrusion 13, so that the deformation of the limiting protrusion 13 can be avoided, that is, the limiting protrusion 13 is prevented from deforming in a direction away from the center line of the valve seat portion 10, thereby preventing the silencing component 20 from being disengaged from the limiting portion, and at the same time, the connection strength between the limiting portion and the connection pipe 30 can be ensured, so that the ability of the limiting portion to bear heavy loads and impacts can be improved, the connection stability between the limiting portion and the connection pipe 30 can be maintained for a long time, and at the same time, the sealing performance between the valve seat portion 10 and the connection pipe 30 can be ensured to avoid fluid leakage.

[0050] As Figure 3 and Figure 4 shown, there is a gap 31 between the outer side wall of the limiting protrusion 13 and the inner wall of the connection pipe 30. The valve seat portion 10 includes a main body section 14 and a connection section 15. The diameter of the connection section 15 is smaller than that of the main body section 14. There is a first stepped surface 16 between the main body section 14 and the connection section 15. A placement portion is provided between the first stepped surface 16 and the outer side wall of the connection pipe 30. The connection section 15 has a connection port 12, and the connection pipe 30 is sleeved on the connection section 15. There is a gap 32 between the outer side wall of the connection section 15 and the inner wall of the connection pipe 30. One end of the gap 32 communicates with the placement portion, and the other end of the gap 32 communicates with the gap 31. The placement portion is used for placing the welding ring 1. With such a setting, the welding ring 1 in the placement portion can flow into the gap 31 through the gap 32 after melting, and thus the limiting protrusion 13 can be welded. With such a setting, it is convenient for the staff to weld the limiting protrusion 13, and the operation is simple. At the same time, during the welding process, the staff can place the welding ring 1 in the placement portion, which is convenient for positioning the welding ring 1 and avoiding dislocation of the welding ring 1. At the same time, the limiting protrusion 13 can block the flowing solder 2 and prevent the solder 2 from flowing onto the silencing component 20.

[0051] In a specific embodiment of the present application, the placement portion is a placement groove 161, and the placement groove 161 is provided on the first stepped surface 16. With such a setting, it is convenient to process the placement portion.

[0052] When the staff welds and fixes the connecting pipe 30 and the valve seat portion 10 and places the welding ring 1, the electronic expansion valve is usually inverted, that is, the connecting pipe 30 is located above the valve seat portion 10. Optionally, in other embodiments, the valve seat portion 10 may not be provided with the placement groove 161, and the welding ring 1 can be directly placed between the first stepped surface 16 and the connecting pipe 30.

[0053] Optionally, as Figure 5 shown, the staff can place the welding ring 1 in the interval 31.

[0054] During the actual welding process, the staff can select the model of the welding ring 1 according to the requirements.

[0055] Furthermore, the gap 32 between the outer side wall of the connecting section 15 and the inner wall of the connecting pipe 30 is set between 0.005 mm and 0.1 mm. In this application, the gap 32 between the outer side wall of the connecting section 15 and the inner wall of the connecting pipe 30 is the unilateral gap 32. When the gap 32 between the outer side wall of the connecting section 15 and the inner wall of the connecting pipe 30 is less than 0.005 mm, the gap 32 between the outer side wall of the connecting section 15 and the inner wall of the connecting pipe 30 is too small, which is not conducive to the flow of the solder 2, and the solder 2 is extremely easy to be blocked in the gap 32; when the gap 32 between the outer side wall of the connecting section 15 and the inner wall of the connecting pipe 30 is greater than 0.1 mm, the gap 32 between the outer side wall of the connecting section 15 and the inner wall of the connecting pipe 30 is too large, which will lead to an increase in the amount of the required solder 2 and cause waste of the solder 2; therefore, the gap 32 between the outer side wall of the connecting section 15 and the inner wall of the connecting pipe 30 is set between 0.005 mm and 0.1 mm, so that the solder 2 can climb to the interval 31 by capillary action, and at the same time, the amount of the solder 2 can be reduced to avoid waste of the solder 2.

[0056] Optionally, the gap 32 between the outer side wall of the connecting section 15 and the inner wall of the connecting pipe 30 can be set to 0.005 mm, 0.05 mm or 0.1 mm.

[0057] Wherein, the included angle α between the limiting protrusion 13 and the central line of the valve seat portion 10 is set between 10° and 45°. When the included angle α between the limiting protrusion 13 and the central line of the valve seat portion 10 is less than 10°, the included angle α between the limiting protrusion 13 and the central line of the valve seat portion 10 is too small, and the limiting effect of the limiting protrusion 13 on the silencing component 20 is poor, and the silencing component 20 is extremely likely to fall off from the connection port 12; when the included angle α between the limiting protrusion 13 and the central line of the valve seat portion 10 is greater than 45°, the included angle α between the limiting protrusion 13 and the central line of the valve seat portion 10 is too large. With such a setting, the processing difficulty of the limiting protrusion 13 will be increased, and during the process of processing the valve seat portion 10, the silencing component 20 is extremely likely to be damaged; therefore, the included angle α between the limiting protrusion 13 and the central line of the valve seat portion 10 is set between 10° and 45°, which can not only ensure the limiting effect of the limiting protrusion 13 on the silencing component 20, but also reduce the processing difficulty of the valve seat portion 10 and avoid damaging the silencing component 20 during the processing process.

[0058] Optionally, the included angle α between the limiting protrusion 13 and the central line of the valve seat portion 10 can be set to 10°, 25° or 45°.

[0059] Furthermore, the outer side wall of the limiting portion and the inner side wall of the connecting pipe 30 are fixed by furnace welding or brazing. With such a setting, the quality of the welded joint between the limiting portion and the connecting pipe 30 can be ensured, stress concentration can be reduced, and at the same time, brazing has good sealing performance to avoid leakage between the limiting portion and the connecting pipe 30.

[0060] Specifically, the inner side and / or the outer side of the end of the connecting pipe 30 close to the valve seat portion 10 has a chamfer 33. With such a setting, the burrs on the connecting pipe 30 can be removed, thus facilitating the flow of the solder 2.

[0061] Wherein, the connecting pipe 30 has a first straight section 34, a transition section 35 and a second straight section 36 connected in sequence. The first straight section 34 is sleeved outside the connection port 12, the diameter of the second straight section 36 is smaller than the diameter of the first straight section 34, and the diameter of the transition section 35 gradually decreases along the direction close to the second straight section 36. With such a setting, the inner diameter of the first straight section 34 is adapted to the outer diameter of the connection section 15, which is convenient for the connection of the connecting pipe 30 and the valve seat portion 10. At the same time, the transition section 35 can avoid the sudden change of the fluid flow velocity and ensure the normal flow of the fluid.

[0062] Further, one end of the connection port 12 away from the limiting portion has a second stepped surface 121. The silencing component 20 includes a first silencing member 21, a fixing sleeve 22, and a second silencing member 23. The first silencing member 21 is disposed within the connection port 12, and one end of the first silencing member 21 abuts against the second stepped surface 121. One end of the fixing sleeve 22 abuts against the other end of the first silencing member 21. The second stepped surface 121 and the fixing sleeve 22 cooperate to axially limit the first silencing member 21, and a fixing groove is provided at the other end of the fixing sleeve 22. And the limiting protrusion 13 contacts the fixing sleeve 22. The second silencing member 23 is disposed within the fixing groove. With such a setting, it is possible to avoid damaging the first silencing member 21 and the second silencing member 23 during the process of machining the limiting protrusion 13, so that the first silencing member 21 and the second silencing member 23 can normally perform the silencing work.

[0063] Specifically, a through hole 221 is provided on the fixing sleeve 22. With such a setting, it is possible to ensure the normal flow of the fluid and avoid blockage of the fluid at the silencing component 20.

[0064] Further, in the present application, a through hole 211 is provided in the middle of the first silencing member 21. The projection of the through hole 211 is located on the second silencing member 23. A plurality of through holes 221 are provided on the fixing sleeve 22. The plurality of through holes 221 are annularly arranged on the outer periphery of the second silencing member 23. The projection of the through hole 221 is located on the first silencing member 21. With such a setting, it is possible to ensure the silencing effect of the silencing component 20 while ensuring the smoothness of the fluid flow.

[0065] In a specific embodiment of the present application, the silencing component 20 can be fixed within the connection port 12 by riveting. The limiting protrusion 13 is a riveting protrusion. The riveting protrusion is welded and fixed to the connecting pipe 30. There is solder 2 between the outer side wall of the riveting protrusion and the inner wall of the connecting pipe 30. With such a setting, it is convenient to machine the limiting protrusion 13, reduce the processing difficulty of the staff, and the processing cost is low, avoiding the generation of additional costs.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0068] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0069] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationships of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientation of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0070] In addition, it should be noted that the use of words such as "first", "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0071] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electronic expansion valve, characterized in that, The electronic expansion valve includes: A valve seat portion (10), the valve seat portion (10) having a connection port (12), the connection port (12) being disposed near an end of the valve seat portion (10), and the end of the valve seat portion (10) having a limiting portion; A silencing component (20), disposed within the connection port (12), and the limiting portion being capable of axially limiting the silencing component (20); A connecting pipe (30), sleeved outside the connection port (12), and there being a filling material between the limiting portion and the connecting pipe (30).

2. The electronic expansion valve according to claim 1, characterized in that, The limiting portion includes a limiting protrusion (13), the limiting protrusion (13) being inclined towards the center line of the valve seat portion (10), and there being a filling material between an outer side wall of the limiting protrusion (13) and an inner wall of the connecting pipe (30).

3. The electronic expansion valve according to claim 2, wherein The limiting protrusion (13) is fixedly welded to the connecting pipe (30), and there is solder (2) between an outer side wall of the limiting protrusion (13) and an inner wall of the connecting pipe (30).

4. The electronic expansion valve according to claim 3, characterized in that, There is a gap (31) between an outer side wall of the limiting protrusion (13) and an inner wall of the connecting pipe (30). The valve seat portion (10) includes a main body section (14) and a connecting section (15), a diameter of the connecting section (15) being smaller than a diameter of the main body section (14), and there being a first stepped surface (16) between the main body section (14) and the connecting section (15). A placement portion is provided between the first stepped surface (16) and an outer side wall of the connecting pipe (30). The connecting section (15) has the connection port (12), the connecting pipe (30) is sleeved on the connecting section (15), and there is a clearance (32) between an outer side wall of the connecting section (15) and an inner wall of the connecting pipe (30). One end of the clearance (32) communicates with the placement portion, and the other end of the clearance (32) communicates with the gap (31). The placement portion is for placing a welding ring (1).

5. The electronic expansion valve according to claim 4, characterized in that, The clearance (32) between an outer side wall of the connecting section (15) and an inner wall of the connecting pipe (30) is set between 0.005 mm and 0.1 mm.

6. The electronic expansion valve according to claim 2, wherein, An angle between the limiting protrusion (13) and the center line of the valve seat portion (10) is set between 10° and 45°.

7. The electronic expansion valve according to claim 3, characterized in that, The outer side wall of the limiting portion and the inner side wall of the connecting pipe (30) are fixed by brazing.

8. The electronic expansion valve according to claim 1, characterized in that, The inner side and / or outer side of one end of the connecting pipe (30) close to the valve seat portion (10) has a chamfer (33).

9. The electronic expansion valve according to claim 1, wherein The connecting pipe (30) has a first straight section (34), a transition section (35), and a second straight section (36) connected in sequence. The first straight section (34) is sleeved outside the connection port (12), a diameter of the second straight section (36) being smaller than a diameter of the first straight section (34), and a diameter of the transition section (35) gradually decreasing in a direction close to the second straight section (36).

10. The electronic expansion valve according to claim 1, characterized in that, One end of the connection port (12) away from the limiting portion has a second stepped surface (121). The silencing component (20) includes: The first sound-absorbing member (21) is disposed within the connection port (12), and one end of the first sound-absorbing member (21) abuts against the second stepped surface (121). A fixing sleeve (22), one end of the fixing sleeve (22) abuts against the other end of the first sound-absorbing member (21), and the second stepped surface (121) cooperates with the fixing sleeve (22) to axially limit the first sound-absorbing member (21), and a fixing groove is provided at the other end of the fixing sleeve (22). A second sound-absorbing member (23) is disposed within the fixing groove.

11. The electronic expansion valve according to claim 4, wherein, The limiting protrusion (13) is a riveting protrusion, the placing portion is a placing groove (161), the placing groove (161) is provided on the first stepped surface (16), and the placing groove (161) is used for placing the welding ring (1).

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