Valve seat structure and electronic expansion valve

Abstract

The utility model provides a valve seat structure and an electronic expansion valve, the valve seat structure comprises a valve seat part and a switching part, the switching part and the valve seat part are respectively used for switching a first connecting pipe and a second connecting pipe, the valve seat part is provided with a limiting cavity, and an opening of the limiting cavity is located on the bottom wall of the valve seat part; at least part of the switching part is arranged in the limiting cavity in a penetrating mode, and the switching part and the valve seat part form an annular welding seam at the opening of the limiting cavity. According to the technical scheme, furnace welding switching of the first connecting pipe is achieved through the switching part, the welding position of the switching part and the valve seat part is limited to the bottom of the valve seat part, and the situation that when the welding position is located on the side of the valve seat part, laser welding and other welding are prone to being interfered by the second connecting pipe, and therefore welding is not facilitated is avoided; welding of operators and realizability of corresponding welding equipment are facilitated, and convenience and reliability of welding are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, and in particular, to a valve seat structure and an electronic expansion valve. Background Technique

[0002] At present, an electronic expansion valve can be applied to the field of series reheat dehumidification. Since the electronic expansion valve is arranged between two indoor heat exchangers in this application, it is determined that under normal air-conditioning conditions, the pressure drop of the electronic expansion valve at a large opening degree should be small enough to ensure the overall machine capacity during normal refrigeration and heating. And since the electronic expansion valve is arranged on the indoor side, the requirement for noise is also relatively high. Based on this, a porous sound-absorbing part can be arranged at the valve port of the electronic expansion valve to reduce the noise of refrigerant flow.

[0003] A second pipe and a first pipe are respectively furnace welded to the side part and the bottom part of the valve seat part of the electronic expansion valve. In order to avoid the situation that the solder will affect the sound-absorbing part when the first pipe is directly furnace welded to the valve seat part, a transfer part is often set to realize the transfer between the first pipe and the valve seat part and furnace weld the first pipe on the transfer part, and the transfer part and the valve seat are connected by other welding methods (such as laser welding).

[0004] However, there is a situation where the first pipe and / or the second pipe interfere with the welding between the transfer part and the valve seat. For example, when the welding position is on the side wall of the valve seat part, the size, bending, etc. of the second pipe are likely to cause stop interference during the welding process. In order to avoid the interference of the first pipe and / or the second pipe on the welding, it is necessary to limit the welding position between the transfer part and the valve seat. Summary of the Utility Model

[0005] The utility model provides a valve seat structure and an electronic expansion valve to solve the problem that the first pipe and / or the second pipe interfere with the welding between the transfer part and the valve seat in the prior art.

[0006] To solve the above problems, according to one aspect of the utility model, the utility model provides a valve seat structure, including a valve seat part and a transfer part. The transfer part and the valve seat part are respectively used to transfer the first pipe and the second pipe. The valve seat part has a limiting cavity, and the opening of the limiting cavity is located at the bottom wall of the valve seat part; at least part of the transfer part is inserted into the limiting cavity, and the transfer part and the valve seat part form a circumferential weld at the opening of the limiting cavity.

[0007] Further, the transfer part includes a first matching section that is limitedly matched with the inner wall of the limiting cavity. The first matching section is at least partially inserted into the limiting cavity, and the bottom of the first matching section and the bottom of the valve seat part form a circumferential weld at the opening of the limiting cavity.

[0008] Further, the entire first mating section is inserted into the limiting cavity, the bottom wall of the first mating section is flush with the bottom wall of the valve seat portion, and a circumferential weld is formed between the bottom wall of the first mating section and the bottom wall of the valve seat portion where the opening is located.

[0009] Further, the bottom wall of the first mating section and / or the bottom wall of the valve seat portion has a circumferential groove at the circumferential weld.

[0010] Further, the bottom wall of the first mating section is spaced apart from the bottom wall of the valve seat portion in the axial direction of the valve seat structure.

[0011] Further, the bottom of the first mating section protrudes from the opening of the limiting cavity, and the distance between the bottom wall of the first mating section and the bottom wall of the valve seat portion where the opening is located in the axial direction of the valve seat structure is H, where 0.1 mm ≤ H ≤ 1 mm.

[0012] Further, the adapter section further includes a second mating section provided on the bottom wall of the first mating section. The second mating section is used to connect and coaxial with the first connecting pipe, and at least part of the second mating section is located outside the limiting cavity and the radial dimension is smaller than that of the first mating section. The bottom wall of the first mating section is an outer stepped surface, which is located between the outer walls of the first mating section and the second mating section. The outer stepped surface protrudes from the limiting cavity to form a positioning reference surface, or the outer stepped surface is flush with the surface where the opening of the limiting cavity is located to form a positioning reference surface.

[0013] Further, the outer wall of at least part of the first mating section inserted into the limiting cavity is in interference fit with the inner wall of the limiting cavity.

[0014] Further, there is a circumferential stop projection in the adapter section. The circumferential stop projection is provided between the first mating section and the second mating section. The inner diameter of the circumferential stop projection is smaller than the inner diameter of the second mating section. The area surrounded by the circumferential stop projection forms a transfer port. One end of the first connecting pipe is arranged in the second mating section and is in stop fit with the circumferential stop projection. The transfer port is communicated with the opening of the first connecting pipe.

[0015] According to another aspect of the present invention, an electronic expansion valve is provided. The electronic expansion valve includes the above valve seat structure, and the adapter section and the valve seat portion are laser welded at the circumferential weld.

[0016] Further, the electronic expansion valve further includes a sound-absorbing section, and the sound-absorbing section is provided in the valve seat portion or the adapter section.

[0017] Applying the technical solution of the present invention, a valve seat structure is provided, which includes a valve seat portion and an adapter section. The adapter section and the valve seat portion are respectively used to connect the first connecting pipe and the second connecting pipe. The valve seat portion has a limiting cavity, and the opening of the limiting cavity is located at the bottom wall of the valve seat portion; at least part of the adapter section is inserted into the limiting cavity, and the adapter section and the valve seat portion form a circumferential weld at the opening of the limiting cavity.

[0018] With this solution, the furnace welding transition of the first connecting pipe is realized through the transition part, and the welding position of the transition part and the valve seat part is limited to the bottom of the valve seat part, avoiding the situation that is not conducive to welding, such as when the welding position is on the side of the valve seat part, laser welding and other welding are easily interfered by the second connecting pipe. This is convenient for the operation of the operator and the realization of the corresponding welding equipment, and improves the convenience and reliability of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0020] Figure 1 shows a schematic structural diagram of an electronic expansion valve provided by an embodiment of the present utility model;

[0021] Figure 2 shows Figure 1 an enlarged view of position A in;

[0022] Figure 3 shows Figure 2 an enlarged view of position B in;

[0023] Figure 4 shows a schematic structural diagram of an electronic expansion valve provided by another embodiment of the present utility model;

[0024] Figure 5 shows Figure 4 an enlarged view of position C in;

[0025] Figure 6 shows Figure 5 an enlarged view of position D in.

[0026] Among them, the above-mentioned drawings include the following reference numerals:

[0027] 1, annular groove;

[0028] 10, valve seat part; 102, valve cavity; 1031, limiting cavity;

[0029] 11, valve seat;

[0030] 12, valve seat core;

[0031] 20, transition part;

[0032] 201, outer stepped surface; 202, transition interface;

[0033] 21, first mating section;

[0034] 22, second mating section;

[0035] 23. Annular stop projection;

[0036] 24. Riveting flange;

[0037] 30. Sound-absorbing part;

[0038] 41. First connecting pipe;

[0039] 42. Second connecting pipe. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0041] As Figures 1 to 6 shown, an embodiment of the present invention provides a valve seat structure, including a valve seat portion 10 and a transition portion 20. The transition portion 20 and the valve seat portion 10 are respectively used to connect the first connecting pipe 41 and the second connecting pipe 42. The valve seat portion 10 has a limiting cavity 1031, and the opening of the limiting cavity 1031 is located at the bottom wall of the valve seat portion 10; at least a part of the transition portion 20 is inserted into the limiting cavity 1031, and the transition portion 20 and the valve seat portion 10 form a circumferential weld at the opening of the limiting cavity 1031, and the transition portion 20 and the valve seat portion 10 are laser welded at the circumferential weld.

[0042] In this embodiment, the furnace welding connection of the first connecting pipe 41 is realized through the transition portion 20, and the laser welding position of the transition portion 20 and the valve seat portion 10 is limited to the bottom of the valve seat portion 10, avoiding the situation that when the welding position is on the side of the valve seat portion 10, laser welding is easily interfered by the second connecting pipe 42 and other situations that are not conducive to welding, facilitating the welding of the operator and the realization of the corresponding welding equipment, and improving the convenience and reliability of welding.

[0043] As Figure 2 and Figure 5 shown, the transition portion 20 includes a first fitting section 21 that is in limit fit with the inner wall of the limiting cavity 1031. The first fitting section 21 is at least partially inserted into the limiting cavity 1031, and the bottom of the first fitting section 21 and the bottom of the valve seat portion 10 form a circumferential weld at the opening of the limiting cavity 1031.

[0044] This arrangement avoids the situation where the second connecting pipe 42 interferes with the welding when the laser welding position is formed on the side of the valve seat structure of the electronic expansion valve. At the same time, it is convenient for the limited installation of the adapter part 20, ensuring the reliability of the installation of the adapter part 20 and the reliability of the forming of the annular weld at the bottom of the valve seat part 10.

[0045] The valve seat portion 10 also has a valve cavity 102. It should be noted that, in the series reheat dehumidification system, the electronic expansion valve is arranged between the two indoor heat exchangers, which determines that under normal air-conditioning conditions, the pressure drop of the electronic expansion valve at a large opening is as small as possible to ensure the energy efficiency of the air-conditioning system, and the indoor side has a high requirement for noise. Therefore, it is necessary to set a silencer structure (corresponding to the silencer portion 30 of the electronic expansion valve in this solution) at the valve port (corresponding to the valve cavity 102 in this solution). In order to reduce the throttling of the porous silencer structure, the area of the multi-hole silencer structure can be increased and a large-diameter electronic expansion valve can be used. In the related art, the pipe (corresponding to the first pipe 41 in this embodiment) ) one end directly extends into the valve seat (corresponding to the valve seat 11 of the valve seat portion 10 in this solution) and directly abuts against the silencer portion 30, and the end of the pipe extending into the valve seat must have a larger outer diameter; and, in the series reheat dehumidification system, the electronic expansion valve is mainly used in 1-3p units, and the inner diameter of the corresponding indoor heat exchanger connecting pipe is smaller than that of the units above 3P. The other end of the electronic expansion valve pipe is connected to the indoor heat exchanger connecting pipe, which determines that the inner diameter of the other end of the pipe is smaller, the pipe diameters at both ends of the electronic expansion valve pipe are inconsistent and the span is larger, and the solution of the pipe abutting the silencer mechanism makes the pipe consist of three or more pipes with different diameters. This type of pipe is difficult to process and has high cost.

[0046] In response to the above problems, Figure 2 and Figure 5 As shown, the transition portion 20 also includes a second mating segment 22 arranged on the bottom wall of the first mating segment 21, the second mating segment 22 is used to transition the first connecting pipe 41 and is coaxial with the first mating segment 21, at least part of the second mating segment 22 is located outside the limiting cavity 1031 for transitioning the first connecting pipe 41, and the radial dimension of the second mating segment 22 is smaller than the radial dimension of the first mating segment 21.

[0047] In this embodiment, the inner diameter of the second fitting section 22 is smaller than that of the first fitting section 21, and the outer diameter of the second fitting section 22 is smaller than that of the first fitting section 21. By defining the dimensions (inner diameter and outer diameter) of the first fitting section 21 and the second fitting section 22, the adapter section 20 can be adapted to valve seat sections 10 of different sizes. At the same time, the reduction of the radial dimension of the second fitting section 22 is equivalent to forming a necking in the adapter section 20 itself. Therefore, the end of the first connecting pipe 41 connected to the adapter section 20 does not need to be reduced in diameter to adapt to the large-diameter valve seat section 10 anymore. Only the appropriate raw material needs to be selected according to the diameter of the electronic expansion valve to process the first connecting pipe 41, so as to reduce the processing difficulty of the first connecting pipe 41 and improve the processing efficiency.

[0048] It can be understood that the other end of the first connecting pipe 41 is connected to the system pipeline. The necking treatment, flaring treatment or no treatment of the adapter section 20 are all determined according to the actual situation. Compared with the situation where the first connecting pipe 41 is directly connected to the valve seat section 10, at least one flaring process is saved for the end of the first connecting pipe 41 connected to the electronic expansion valve through the adapter section 20.

[0049] As Figure 2 and Figure 5 shown, the bottom wall of the first fitting section 21 is an outer stepped surface 201. The outer stepped surface 201 is located between the outer walls of the first fitting section 21 and the second fitting section 22. The bottom wall of the first fitting section 21 located between the outer walls of the first fitting section 21 and the second fitting section 22 is the outer stepped surface 201. The outer stepped surface 201 protrudes from the limiting cavity 1031 or is flush with the surface where the opening of the limiting cavity 1031 is located and forms a positioning reference surface.

[0050] With such a setting, compared with the situation where the valve seat section 10 is directly connected to the first connecting pipe 41 and the end face of the opening of the valve seat section 10 facing the first connecting pipe 41 is used as the positioning reference surface, the area of the positioning reference surface is increased. And due to the setting of the adapter section 20, the placement position of the welding ring for furnace welding of the first connecting pipe 41 is far from the positioning reference surface. During furnace welding, there will be no situation where the solder melts and spreads on the positioning reference surface, resulting in insufficient positioning reference dimensions and inaccurate positioning. There is almost no impact on the positioning reference and it will not affect the positioning during the subsequent assembly and welding.

[0051] Among them, the outer wall of the first fitting section 21 at least partially passing through the limiting cavity 1031 is in interference fit with the inner wall of the limiting cavity 1031.

[0052] With such a setting, it is convenient for the limiting installation of the first fitting section 21. Among them, the interference height between the first fitting section 21 and the inner wall of the limiting cavity 1031 can be adjusted according to the actual situation to avoid the situation where the length of the tightly fitted interference section is too long, resulting in high pressing difficulty.

[0053] In as Figures 1 to 3In the illustrated embodiment, the entire first mating section 21 is inserted into the limiting cavity 1031. The bottom wall of the first mating section 21 is flush with the bottom wall of the valve seat portion 10, and a circumferential weld is formed between the bottom wall of the first mating section 21 and the bottom wall of the valve seat portion 10 where the opening is located.

[0054] In this embodiment, the circumferential weld is formed at the gap opening between the bottom wall of the first mating section 21 and the bottom wall of the valve seat portion 10 where the opening is located. The operator can perform vertical welding on the circumferential weld from the bottom of the valve seat portion 10 to ensure the reliability of welding. It can be understood that the difference between the radial dimension of the circumferential weld and the radial dimension of the second mating section 22 can be adjusted according to the actual situation, as long as it is ensured that the first connecting pipe 41 does not interfere with the welding process.

[0055] Furthermore, in order to avoid the situation where the height of the laser welding mark after welding is too high, the bottom wall of the first mating section 21 and / or the bottom wall of the valve seat portion 10 has a circumferential groove 1 at the circumferential weld. With this setting, the area within the circumferential groove 1 can be used as the circumferential weld, and the laser welding mark after welding will be entirely or mostly located within the circumferential groove 1, achieving the hiding of the laser welding mark after welding. The laser welding mark formed by laser welding will not protrude from the positioning reference surface or the protruding part has almost no impact on the positioning reference effect of the positioning reference surface, and will not affect the positioning during subsequent assembly and welding, so as to ensure the reliability of welding and the reliability of the positioning reference surface.

[0056] Preferably, the cross-sectional shape of the circumferential groove 1 can be adaptively adjusted according to the actual situation, and is not limited to the triangular shape in this embodiment.

[0057] On the other hand, in other embodiments, the bottom wall of the first mating section 21 and the bottom wall of the valve seat portion 10 are spaced apart in the axial direction of the valve seat structure.

[0058] In another embodiment as shown in Figures 4 to 6 In another embodiment, a part of the first mating section 21 is inserted into the limiting cavity 1031, and the circumferential weld is formed between the side wall of the first mating section 21 and the bottom wall of the valve seat portion 10 where the opening of the limiting cavity 1031 is located; or, in another embodiment not shown in the figure, the entire first mating section 21 is inserted into the limiting cavity 1031, and the circumferential weld is formed between the bottom wall of the first mating section 21 and the inner wall of the limiting cavity 1031, which is convenient for the operator to tilt the laser welding from the bottom of the valve seat portion 10, is beneficial for focusing during welding, and improves the convenience and reliability of welding.

[0059] Specifically, as shown in Figures 4 to 6As shown, the bottom of the first mating section 21 in this embodiment protrudes from the opening of the limiting cavity 1031. The distance between the bottom wall of the first mating section 21 and the bottom wall of the valve seat portion 10 where the opening is located in the axial direction of the valve seat structure is H, and 0.1 mm ≤ H ≤ 1 mm. By limiting H, it is possible to prevent the height of the laser welding mark after welding formed by welding from protruding from the bottom wall of the first mating section 21, so that the laser welding mark formed by laser welding will not protrude from the positioning reference surface or have almost no influence on the positioning reference effect of the protruding part on the positioning reference surface, and it will not affect the positioning during subsequent assembly and welding.

[0060] Specifically, an annular stop protrusion 23 is provided inside the adapter portion 20. The annular stop protrusion 23 is arranged between the first mating section 21 and the second mating section 22 and protrudes inward in the radial direction of the adapter portion 20. The inner diameter of the annular stop protrusion 23 is smaller than the inner diameter of the second mating section 22. The area surrounded by the annular stop protrusion 23 forms an adapter opening 202. One end of the first connecting pipe 41 is arranged inside the second mating section 22 and is in stop cooperation with the annular stop protrusion 23, and the adapter opening 202 is communicated with the opening of the first connecting pipe 41.

[0061] In this embodiment, one end of the first connecting pipe 41 penetrates into the second mating section 22 and abuts against the annular stop protrusion 23. The penetration depth of the first connecting pipe 41 is limited by the annular stop protrusion 23. The outer diameter of the first connecting pipe 41 is adapted to the inner diameter of the second mating section 22, and the inner diameter of the first connecting pipe 41 is adapted to the radial dimension of the adapter opening 202, which is convenient for the limited installation of the first connecting pipe 41 and the formation of the adapter opening 202. At the same time, it realizes the smooth transition of the refrigerant flowing through the adapter opening 202 and the first connecting pipe 41, and reduces the flow noise of the refrigerant.

[0062] It should be noted that the adapter portion 20 can be a stretching part, a precision machining part, etc. In this embodiment, since multiple steps and flow channels need to be machined inside the adapter portion 20, and the adapter portion 20 needs to be press-fitted into the valve seat portion 10, there are relatively high requirements for the dimensional accuracy of the adapter portion 20. Therefore, the adapter portion 20 in this embodiment is preferably a precision machining part. It can be understood that the adapter portion 20 can be integrally precision machined, or first stamped and then precision machined (the stepped portion is precision machined), or first cold-headed and then precision machined.

[0063] Preferably, the adapter opening 202 is a flared opening, or the side of the adapter opening 202 facing away from the first connecting pipe 41 has a flared opening. The side with a smaller opening of the flared opening is communicated with the first connecting pipe 41 and the radial dimension is adapted to the inner diameter of the first connecting pipe 41.

[0064] With such a setting, by providing a flared opening, on the one hand, it can ensure that there are no burrs here (the adapter part 20 is a precision-machined part, and burrs are likely to be generated here in the case of a direct flow channel); on the other hand, a second connection pipe 42 is also connected to the side wall of the valve seat part 10 of the electronic expansion valve. When the fluid enters from the first connection pipe 41 and exits from the second connection pipe 42, since the inner diameter of the first flared opening gradually increases along the direction of the first connection pipe 41 towards the valve cavity 102, it provides a buffering effect for the fluid entering from the first connection pipe 41, is not prone to form vortices, realizes a gradual change in pressure, reduces the flow rate, and reduces the impact of the high-speed air flow on the filter screen, that is, reduces the flow rate of the refrigerant entering the valve port position, reduces the turbulent kinetic energy, and thus reduces the noise.

[0065] Another embodiment of the present invention provides an electronic expansion valve, which includes a sound absorption part 30 and the above-mentioned valve seat structure, and the sound absorption part 30 is arranged in the valve seat part 10 or the adapter part 20. Specifically, the valve seat part 10 includes a valve seat 11 and a valve seat core 12 located inside the valve seat 11, at least part of the adapter part 20 extends into the valve seat 11, and the sound absorption part 30 is arranged inside the valve seat core 12 or the adapter part 20.

[0066] Preferably, the valve seat 11 and the valve seat core 12 are separately arranged, the valve seat core 12 is press-fitted into the valve seat 11, the outer wall of at least part of the valve seat core 12 is in interference fit with the inner wall of the cavity of the valve seat 11, and the outer wall of at least part of the adapter part 20 extending into the valve seat 11 is in interference fit with the inner wall of the cavity of the valve seat 11 (the inner wall of the limiting cavity 1031) to ensure the reliability of the installation of the valve seat core 12 and the adapter part 20 and the requirements for installation coaxiality. Or in other embodiments not shown in the drawings, the valve seat 11 and the valve seat core 12 are of an integral structure.

[0067] Among them, the connection between the adapter part 20 and the first connection pipe 41 and the connection between the valve seat part 10 and the second connection pipe 42 can be connected by furnace welding, brazing or other welding methods, and furnace welding connection is preferred.

[0068] In Figures 1 to 3 In the shown embodiment, the valve seat core 12 has a receiving cavity for installing the sound absorption part 30, and the sound absorption part 30 is press-fitted into the receiving cavity of the valve seat core 12.

[0069] In Figures 4 to 6 In another shown embodiment, the adapter part 20 has a receiving cavity for installing the sound absorption part 30, a riveting flange 24 is arranged around the outer periphery of the opening of the receiving cavity, the sound absorption part 30 is riveted and pressed into the receiving cavity of the adapter part 20 by the riveting flange 24, and the valve seat core 12 is press-fitted into the valve seat 11 by the adapter part 20.

[0070] 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 forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. 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 authorization specification. 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.

[0072] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words 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 invention and simplifying the description. Without contrary description, these orientation words 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 invention; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0073] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0074] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the protection scope of the present utility model.

[0075] 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, the present utility model can have various modifications and variations. 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. A valve seat structure, characterized in that, It includes a valve seat part (10) and an adapter part (20). The adapter part (20) and the valve seat part (10) are respectively used to connect a first connecting pipe (41) and a second connecting pipe (42). The valve seat part (10) has a limiting cavity (1031), and the opening of the limiting cavity (1031) is located on the bottom wall of the valve seat part (10); at least part of the adapter part (20) is inserted into the limiting cavity (1031), and a circumferential weld is formed between the adapter part (20) and the valve seat part (10) at the opening of the limiting cavity (1031).

2. The valve seat structure according to claim 1, characterized in that, The adapter part (20) includes a first fitting section (21) that is in limiting fit with the inner wall of the limiting cavity (1031). The first fitting section (21) is at least partially inserted into the limiting cavity (1031), and the bottom of the first fitting section (21) and the bottom of the valve seat part (10) form the circumferential weld at the opening of the limiting cavity (1031).

3. The seat structure according to claim 2, wherein, The whole of the first fitting section (21) is inserted into the limiting cavity (1031), the bottom wall of the first fitting section (21) is flush with the bottom wall of the valve seat part (10), and the circumferential weld is formed between the bottom wall of the first fitting section (21) and the bottom wall of the valve seat part (10) where the opening is located.

4. The valve seat structure according to claim 3, characterized in that, The bottom wall of the first fitting section (21) and / or the bottom wall of the valve seat part (10) has a circumferential groove (1) at the circumferential weld.

5. The valve seat structure according to claim 2, wherein, The bottom wall of the first fitting section (21) is spaced from the bottom wall of the valve seat part (10) in the axial direction of the valve seat structure.

6. The valve seat structure according to claim 5, characterized in that, The bottom of the first fitting section (21) protrudes from the opening of the limiting cavity (1031), and the spacing distance H between the bottom wall of the first fitting section (21) and the bottom wall of the valve seat part (10) where the opening is located in the axial direction of the valve seat structure satisfies 0.1mm ≤ H ≤ 1mm.

7. The valve seat structure according to claim 2, characterized in that The adapter part (20) further includes a second fitting section (22) provided on the bottom wall of the first fitting section (21). The second fitting section (22) is used to connect the first connecting pipe (41) and is coaxial with the first fitting section (21). At least part of the second fitting section (22) is located outside the limiting cavity (1031) and its radial dimension is smaller than the radial dimension of the first fitting section (21). The bottom wall of the first fitting section (21) is an outer stepped surface (201), and the outer stepped surface (201) is located between the outer walls of the first fitting section (21) and the second fitting section (22). The outer stepped surface (201) protrudes from the limiting cavity (1031) to form a positioning reference surface, or the outer stepped surface (201) is flush with the surface where the opening of the limiting cavity (1031) is located to form a positioning reference surface.

8. The valve seat structure according to claim 7, characterized in that, The outer wall of the first fitting section (21) at least partially inserted into the limiting cavity (1031) is in interference fit with the inner wall of the limiting cavity (1031).

9. The valve seat structure according to claim 7, wherein The adapter portion (20) has an annular stop projection (23) therein. The annular stop projection (23) is disposed between the first mating section (21) and the second mating section (22) and protrudes inwardly in the radial direction of the adapter portion (20). The inner diameter of the annular stop projection (23) is smaller than the inner diameter of the second mating section (22). The area surrounded by the annular stop projection (23) forms an adapter opening (202). One end of the first connecting pipe (41) is disposed within the second mating section (22) and is in stop cooperation with the annular stop projection (23). The adapter opening (202) is in communication with the opening of the first connecting pipe (41).

10. An electronic expansion valve, characterized in that, The electronic expansion valve includes the valve seat structure according to any one of claims 1 to 9. The adapter portion (20) and the valve seat portion (10) are laser welded at the circumferential weld.

11. The electronic expansion valve according to claim 10, wherein, The electronic expansion valve further includes a sound damping portion (30). The sound damping portion (30) is disposed within the valve seat portion (10) or the adapter portion (20).

Images