Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve seat structure and a noise reduction part, the valve seat structure is provided with a containing cavity, the containing cavity comprises a plurality of limiting cavity sections which are sequentially communicated in the installation direction of the noise reduction part, and the inner diameters of the limiting cavity sections are in a decreasing trend in the installation direction of the noise reduction part. The silencing part comprises a plurality of silencing blocks with different outer diameters, and any silencing block is correspondingly installed in a limiting cavity section with the inner diameter matched with the outer diameter of the silencing block in a limiting mode. According to the technical scheme provided by the utility model, the corresponding installation of a plurality of silencing blocks with different outer diameters is realized through the multi-section reducing division of the accommodating cavity, the condition of wrong installation sequence caused by the confusion of the plurality of silencing blocks can be avoided, and the improvement of the installation efficiency of the silencing part is facilitated.

Description

Technical Field

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

[0002] At present, the electronic expansion valve can be applied to the field of series reheat dehumidification. In this application, the electronic expansion valve is arranged between two indoor side heat exchangers. 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 the refrigerant flow.

[0003] In the electronic expansion valve in the related art, the sound-absorbing part is installed in the cavity inside the valve seat structure. The sound-absorbing part usually includes two or more sound-absorbing blocks, and each sound-absorbing block corresponds to different positions of the electronic expansion valve in the axial direction. However, when installing multiple sound-absorbing blocks, it is easy to confuse different sound-absorbing blocks, resulting in an incorrect installation sequence, which in turn affects the installation efficiency or the noise reduction effect of the sound-absorbing part. Summary of the Utility Model

[0004] The utility model provides an electronic expansion valve to solve the problem that the installation sequence is easily incorrect when installing multiple sound-absorbing blocks in the prior art.

[0005] To solve the above problems, the utility model provides an electronic expansion valve, which includes a valve seat structure and a sound-absorbing part. The valve seat structure has a receiving cavity, and the receiving cavity includes a plurality of limiting cavity segments that are sequentially communicated along the installation direction of the sound-absorbing part. The inner diameters of the plurality of limiting cavity segments show a decreasing trend in the installation direction of the sound-absorbing part. The sound-absorbing part includes a plurality of sound-absorbing blocks with different outer diameters, and any one of the sound-absorbing blocks is limited and correspondingly installed in the limiting cavity segment whose inner diameter is adapted to the outer diameter of the sound-absorbing block.

[0006] Further, the plurality of limiting cavity segments include a first limiting cavity segment and a second limiting cavity segment that are sequentially communicated along the installation direction of the sound-absorbing part. The radial dimension of the first limiting cavity segment is larger than that of the second limiting cavity segment; the plurality of sound-absorbing blocks include a first sound-absorbing block and a second sound-absorbing block. The first sound-absorbing block is arranged in the first limiting cavity segment and is in limiting cooperation with the inner wall of the first limiting cavity segment, and the second sound-absorbing block is arranged in the second limiting cavity segment and is in limiting cooperation with the inner wall of the second limiting cavity segment.

[0007] Further, the sound-absorbing part further includes a spacer block arranged between the first sound-absorbing block and the second sound-absorbing block. The outer periphery of the spacer block is in limiting cooperation with the inner wall of the first limiting cavity segment. The first sound-absorbing block, the spacer block, and the second sound-absorbing block are sequentially abutted. The inner diameter of the spacer block is smaller than the outer diameter of the second sound-absorbing block.

[0008] Further, one side of the second sound-absorbing block facing the spacer block protrudes from the second limiting cavity segment and extends into the first limiting cavity segment.

[0009] Furthermore, the side of the second silencer block facing away from the cushion block is flush with the opening of the second limiting cavity section facing away from the first limiting cavity section, and in the axial direction of the electronic expansion valve, the size of the second silencer block is larger than the size of the second limiting cavity section.

[0010] Further, the silencer is laser welded in the accommodating cavity, or the silencer is riveted in the accommodating cavity, or the silencer is press-fitted in the accommodating cavity.

[0011] Furthermore, the valve seat structure includes a valve seat portion and a transition portion, the transition portion is at least partially disposed in the valve seat portion, and the accommodating cavity is located in the valve seat portion or in the transition portion.

[0012] Furthermore, the valve seat portion includes a valve seat and a valve seat core located in the valve seat, the adapter portion at least partially extends into the valve seat, and the accommodating cavity is located in the valve seat core; the valve seat core is arranged in the valve seat, or the valve seat core and the valve seat are an integral structure.

[0013] Furthermore, the silencer is arranged in the accommodating cavity. In the installation direction of the silencer, the silencer has a first end and a second end arranged opposite to each other. The first end abuts in the accommodating cavity, and the second end protrudes out of the opening of the accommodating cavity and abuts against an end of the adapter extending into the valve seat.

[0014] Furthermore, the transition portion includes a first mating section and a second mating section that are connected to each other, the first mating section extends into the valve seat portion, and at least a portion of the second mating section is located outside the valve seat portion for transitioning to the first connecting pipe, the outer diameter of the first mating section is larger than the outer diameter of the second mating section, and the inner diameter of the first mating section is larger than the inner diameter of the second mating section.

[0015] Furthermore, the transition portion further comprises a fixing section connected to an end of the first matching section facing away from the second matching section, the fixing section extends into the valve seat portion, and an area surrounded by the fixing section forms an accommodating cavity.

[0016] Furthermore, a portion of the muffler protruding from the opening side of the fixing section away from the first matching section forms a riveted flange, and the riveted flange is used to rivet the muffler in the accommodating cavity.

[0017] By applying the technical solution of the utility model, an electronic expansion valve is provided, which includes a valve seat structure and a silencer part. The valve seat structure has a accommodating cavity, which includes a plurality of limiting cavity segments connected in sequence along the installation direction of the silencer part. The inner diameters of the plurality of limiting cavity segments tend to decrease in the installation direction of the silencer part. The silencer part includes a plurality of silencer blocks with different outer diameters. The limiting correspondence of any one of the silencer blocks is installed in a limiting cavity segment whose inner diameter is adapted to the outer diameter of the silencer block.

[0018] With this solution, by dividing the accommodation cavity into multiple sections with variable diameters (the first limiting cavity section and the second limiting cavity section), the corresponding installation of multiple sound-absorbing blocks with different outer diameters (the first sound-absorbing block and the second sound-absorbing block) can be achieved, which can avoid the situation of incorrect installation sequence caused by confusion of multiple sound-absorbing blocks, is conducive to improving the installation efficiency of the sound-absorbing part and ensuring the noise reduction effect of the sound-absorbing part. 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 a schematic structural diagram of the valve seat core 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 B in

[0025] Figure 6 shows Figure 5 a schematic structural diagram of the valve seat core in

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

[0027] 10, valve seat structure; 101, accommodation cavity; 1011, first limiting cavity section; 1012, second limiting cavity section; 102, valve orifice; 11, valve seat part; 111, valve seat; 112, valve seat core; 12, adapter part; 121, riveted flange; 122, fixed section; 123, first mating section; 124, second mating section;

[0028] 20, sound-absorbing part; 201, first end; 202, second end; 21, first sound-absorbing block; 22, second sound-absorbing block; 23, spacer block;

[0029] 31, first connecting pipe; 32, second connecting pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described 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 following description of at least one exemplary embodiment 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.

[0031] As Figures 1 to 6 shown, the electronic expansion valve includes a valve seat structure 10 and a silencing portion 20. The valve seat structure 10 has a receiving cavity 101. The receiving cavity 101 includes a plurality of limiting cavity segments that are sequentially communicated along the installation direction of the silencing portion 20. The inner diameters of the plurality of limiting cavity segments show a decreasing trend in the installation direction of the silencing portion 20. The silencing portion 20 includes a plurality of silencing blocks with different outer diameters. Any one of the silencing blocks is correspondingly installed and limited in a limiting cavity segment whose inner diameter is adapted to the outer diameter of the silencing block.

[0032] In this embodiment, through the multi-stage variable-diameter division (the first limiting cavity segment 1011 and the second limiting cavity segment 1012) of the receiving cavity 101, the corresponding installation of a plurality of silencing blocks (the first silencing block 21 and the second silencing block 22) with different outer diameters can be realized, which can avoid the situation of incorrect installation sequence caused by confusion of a plurality of silencing blocks, and is beneficial to improving the installation efficiency of the silencing portion 20 and ensuring the noise reduction effect of the silencing portion 20.

[0033] It should be noted that the installation direction of the silencing portion 20 in this embodiment is the direction parallel to the axial direction of the electronic expansion valve when the silencing portion 20 is installed in the receiving cavity 101.

[0034] Specifically, in this embodiment, the plurality of limiting cavity segments include a first limiting cavity segment 1011 and a second limiting cavity segment 1012 that are sequentially communicated along the installation direction of the silencing portion 20. The radial dimension of the first limiting cavity segment 1011 is larger than that of the second limiting cavity segment 1012; the plurality of silencing blocks include a first silencing block 21 and a second silencing block 22. The first silencing block 21 is arranged in the first limiting cavity segment 1011 and is in limiting cooperation with the inner wall of the first limiting cavity segment 1011. The second silencing block 22 is arranged in the second limiting cavity segment 1012 and is in limiting cooperation with the inner wall of the second limiting cavity segment 1012. As Figure 3 shown, the inner diameter of the first limiting cavity segment 1011 is adapted to the outer diameter of the first silencing block 21, and the inner diameter of the second limiting cavity segment 1012 is adapted to the outer diameter of the second silencing block 22.

[0035] Among them, a flow-through area and a decomposition area are provided on both the first sound-absorbing block 21 and the second sound-absorbing block 22. At least part of the flow-through area provided on the first sound-absorbing block 21 is correspondingly arranged with the decomposition area provided on the second sound-absorbing block 22, and at least part of the flow-through area provided on the second sound-absorbing block 22 is correspondingly arranged with the decomposition area provided on the first sound-absorbing block 21.

[0036] It can be understood that the number of sound-absorbing blocks included in the sound-absorbing part 20 is not limited to 2 in this embodiment, and the multi-segment variation division of the accommodation cavity 101 is not limited to the first limit cavity segment 1011 and the second limit cavity segment 1012 in the present utility model; the division of the accommodation cavity 101 can be determined according to the actual number of sound-absorbing blocks included in the sound-absorbing part 20, and the radial dimensions of the multiple limit cavity segments divided from the accommodation cavity 101 show a decreasing trend as a whole in the installation direction of the sound-absorbing part 20 to ensure the correct installation of the multiple sound-absorbing blocks of the sound-absorbing part 20.

[0037] As Figure 2 and Figure 5 shown, the sound-absorbing part 20 further includes a spacer block 23 arranged between the first sound-absorbing block 21 and the second sound-absorbing block 22. The outer periphery of the spacer block 23 is in limit fit with the inner wall of the first limit cavity segment 1011. The first sound-absorbing block 21, the spacer block 23, and the second sound-absorbing block 22 are sequentially abutted. The inner diameter of the spacer block 23 is smaller than the outer diameter of the second sound-absorbing block 22.

[0038] With such a setting, the interval between two adjacent sound-absorbing blocks is realized through the spacer block 23, avoiding the situation that the distance between the two sound-absorbing blocks is too small, which affects the sound-absorbing effect, and ensuring the reliability of the sound-absorbing part 20. On the other hand, by limiting the inner diameter of the spacer block 23 and the outer diameter of the second sound-absorbing block 22, the reliability of the abutment of the spacer block 23 with the first sound-absorbing block 21 and the second sound-absorbing block 22 at both ends in the axial direction of the electronic expansion valve is ensured. Preferably, the spacer block 23 in this embodiment is of an annular structure.

[0039] Specifically, the side of the second sound-absorbing block 22 facing the spacer block 23 protrudes from the second limit cavity segment 1012 and extends into the first limit cavity segment 1011.

[0040] With such a setting, when the side of the second sound-absorbing block 22 facing the spacer block 23 is located in the second limit cavity segment 1012, it is avoided that the spacer block 23 cannot effectively abut and limit the second sound-absorbing block 22, and further, the situation that the second sound-absorbing block 22 is prone to crosstalk in the second limit cavity segment 1012 is ensured, and the abutment and limiting effect of the spacer block 23 on the second sound-absorbing block 22 is ensured.

[0041] Further, the side of the second sound-absorbing block 22 facing away from the spacer block 23 is flush with the opening on the side of the second limit cavity segment 1012 facing away from the first limit cavity segment 1011. In the axial direction of the electronic expansion valve, the size of the second sound-absorbing block 22 is larger than the size of the second limit cavity segment 1012.

[0042] This arrangement facilitates the design of the second muffler block 22 protruding from the second limiting cavity section 1012 and the corresponding processing of the second muffler block 22 and the second limiting cavity section 1012, which is beneficial to improving processing efficiency.

[0043] The silencer 20 is laser welded in the accommodating cavity 101, or riveted in the accommodating cavity 101, or pressed into the accommodating cavity 101. The silencer 20 is not limited to the aforementioned fixing method, as long as the silencer 20 can be fixed in the accommodating cavity 101.

[0044] The valve seat structure 10 includes a valve seat portion 11 and a transition portion 12. The transition portion 12 is at least partially disposed in the valve seat portion 11. The side portion of the valve seat portion 11 and the bottom of the transition portion 12 are respectively used to connect the second connecting pipe 32 and the first connecting pipe 31. Figures 1 to 3 In the illustrated embodiment, the accommodating cavity 101 is located in the valve seat portion 11. Specifically, the valve seat portion 11 includes a valve seat 111 and a valve seat core 112 located in the valve seat 111. The adapter portion 12 at least partially extends into the valve seat 111. The accommodating cavity 101 is located in the valve seat core 112. The valve seat core 112 is disposed in the valve seat 111. The connection between the adapter portion 12 and the first connecting pipe 31 and the connection between the valve seat portion 11 and the second connecting pipe 32 can be connected by furnace welding, brazing or other welding methods, preferably furnace welding.

[0045] In this arrangement, the adapter 12 allows the furnace welding object of the first pipe 31 to be changed from the valve seat 11 to the adapter 12. The adapter 12 and the first pipe 31 are furnace welded, and the muffler 20 located in the accommodating cavity 101 and the first pipe 31 are separated by the adapter 12. During furnace welding, the molten solder will not penetrate into the muffler 20, thereby avoiding the situation where the first pipe 31 directly abuts against the muffler 20. When the first pipe 31 and the valve seat 11 are furnace welded, the molten solder is easy to penetrate into the muffler 20 from the gap between the two, thereby affecting the noise reduction effect of the muffler 20, thereby ensuring the noise reduction effect of the muffler 20. On the other hand, in this embodiment, the first pipe 31 does not directly abut against the muffler 20, but realizes the abutment limit of the muffler 20 through the adapter 12, which is more stable and reliable than directly using the first pipe 31 to abut against the muffler 20, which is conducive to ensuring the installation efficiency and installation reliability.

[0046] Preferably, at least part of the outer wall of the valve seat core 112 has an interference fit with the inner wall of the cavity of the valve seat 111, and at least part of the outer wall of the adapter part 12 extending into the cavity of the valve seat 111 has an interference fit with the inner wall of the cavity of the valve seat 111, so as to ensure the reliability of installation of the valve seat core 112 and the adapter part 12 and the installation coaxiality requirements.

[0047] Optionally, in other embodiments not shown in the figures, the valve seat core 112 and the valve seat 111 may be an integral structure.

[0048] In such Figures 1 to 3 In the illustrated embodiment, the installation direction is the axial direction of the electronic expansion valve from the first limiting cavity section 1011 to the second limiting cavity section 1012. In the installation direction of the muffler 20, the muffler 20 has a first end 201 and a second end 202 that are arranged opposite to each other. The first end 201 abuts in the accommodating cavity 101, and the second end 202 protrudes out of the opening of the accommodating cavity 101 and abuts against an end of the adapter 12 extending into the valve seat 111. It can be understood that the first end 201 in this embodiment is an end of the second muffler block 22 that is away from the first muffler block 21 in the axial direction of the electronic expansion valve, and the second end 202 is an end of the first muffler block 21 that is away from the second muffler block 22 in the axial direction of the electronic expansion valve.

[0049] This arrangement facilitates the limited installation of the muffler 20, while ensuring the installation effect of the first muffler block 21 and the entire muffler 20. In this embodiment, one end of the adapter 12 extending into the valve seat 11 abuts against the second end 202 of the first muffler block 21 protruding from the accommodating cavity 101, so as to ensure the abutment and limited installation effect of the first muffler block 21 and the entire muffler 20, and avoid the situation where the muffler 20 is easy to move in the accommodating cavity 101 due to the adapter 12 and the first muffler block 21 not being tightly abutted.

[0050] It should be noted that when the number of the silencer blocks is not limited to two in the present embodiment, the two ends of the two silencer blocks farthest from each other along the axial direction of the electronic expansion valve are respectively the first end 201 and the second end 202 .

[0051] Preferably, the first end 201 abuts against the bottom wall of the accommodating chamber 101, that is, the end of the second silencer block 22 facing away from the first silencer block 21 is flush with the bottom wall of the second limiting chamber section 1012 facing away from the first limiting chamber section 1011, and in the axial direction of the electronic expansion valve, the size of the silencer part 20 is larger than the size of the accommodating chamber 101.

[0052] Such an arrangement facilitates the design of the muffler 20 protruding from the accommodating cavity 101 and the corresponding processing of the muffler 20 and the accommodating cavity 101, which is beneficial to improving the processing efficiency.

[0053] The valve seat portion 11 further comprises a valve cavity 102 , which is located at a side of the accommodating cavity 101 away from the adapter portion 12 and communicates with the accommodating cavity 101 . In this embodiment, the valve cavity 102 is located in the valve seat core 112 .

[0054] 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 high requirements for noise. Therefore, it is necessary to set a silencer structure (corresponding to the silencer part 20 in this embodiment) at the valve port (corresponding to the valve port 102 in this embodiment). In order to reduce the throttling of the porous silencer structure, the area of the porous silencer structure can be increased and a large-diameter electronic expansion valve can be used. In the related art, one end of the connecting pipe (corresponding to the first connecting pipe 31 in this embodiment) directly extends into the valve 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 connecting pipe is connected to the indoor heat exchanger connecting pipe, which determines that the inner diameter of the other end of the connecting pipe is smaller. The pipe diameters of the two ends of the electronic expansion valve connecting pipe are inconsistent and the span is large. The solution of the connecting pipe abutting the silencer mechanism makes the connecting pipe consist of three or more pipes with different diameters. This type of connecting pipe is difficult to process and has high cost.

[0055] In response to the above problem, in the present embodiment, the adapter portion 12 also includes a first mating section 123 and a second mating section 124 connected to each other, the radial dimension of the first mating section 123 is greater than the radial dimension of the second mating section 124 (the outer diameter of the first mating section 123 is greater than the outer diameter of the second mating section 124, and the inner diameter of the first mating section 123 is greater than the inner diameter of the second mating section 124), the first mating section 123 at least partially extends into the valve seat 111 and abuts against one end of the protruding accommodating cavity 101 of the first silencer block 21, and at least part of the second mating section 124 is located outside the valve seat portion 11 for connecting the first connecting pipe 31.

[0056] In this way, by limiting the dimensions (inner diameter and outer diameter) of the first matching segment 123 and the second matching segment 124, the adapter portion 12 can be adapted to valve seat portions 11 of different sizes. At the same time, the reduction in the radial dimension of the second matching segment 124 is equivalent to the formation of a shrinkage in the adapter portion 12 itself. Therefore, the end of the first connecting pipe 31 connected to the connecting portion 12 does not need to be reduced in diameter to adapt to the large-diameter valve seat portion 11. It is only necessary to select suitable raw materials according to the diameter of the electronic expansion valve to process the first connecting pipe 31, so as to reduce the processing difficulty of the first connecting pipe 31 and improve the processing efficiency.

[0057] It can be understood that one end of the first connecting pipe 31 is connected to the system pipeline, and the other end of the first connecting pipe 31 (the end connected to the valve seat 111) is shrinked, expanded or left unchanged according to the actual situation. Compared with the situation where the first connecting pipe 31 is directly connected to the valve seat portion 11, the end of the first connecting pipe 31 connected to the electronic expansion valve saves at least one expanding process through the adapter portion 12.

[0058] on the other hand, Figures 4 to 6 Another embodiment shown provides an electronic expansion valve, the installation direction of which is the axial direction of the electronic expansion valve with the first limiting cavity section 1011 facing the second limiting cavity section 1012. The difference from the above embodiment is that the accommodating cavity 101 in this embodiment is located in the adapter portion 12. Specifically, the adapter portion 12 in this embodiment further includes a fixed segment 122, which is connected to a side of the first matching segment 123 away from the second matching segment 124. The fixed segment 122 and the first matching segment 123 extend into the valve seat 111 of the valve seat portion 11, and the area surrounded by the fixed segment 122 forms the accommodating cavity 101.

[0059] In the installation direction of the silencer 20, the portion of the fixed section 122 that protrudes from the opening side of the silencer 20 away from the first mating section 123 forms a riveted flange 121 (it can also be understood that the riveted flange 121 is formed at the opening of the first limiting cavity section 1011 of the adapter 12), and the riveted flange 121 is used to rivet the silencer 20 in the accommodating cavity 101.

[0060] This arrangement facilitates the limited installation of the muffler 20, which is beneficial to ensuring the reliability of the electronic expansion valve. At the same time, the muffler 20 and the adapter 12 can be installed independently, and then the whole is installed together with the valve seat 11, which is beneficial to improving the assembly efficiency of the electronic expansion valve while ensuring the reliability of the installation of the muffler 20.

[0061] 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 "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0062] 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 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 relationship. 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 values 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.

[0063] In the description of the present utility model, 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", etc. are usually 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 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 cannot be construed as limiting the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0064] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. 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 drawings. 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 orientations 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.

[0065] In addition, it should be noted that the use of words such as "first", "second" etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus cannot be construed as limiting the protection scope of the present utility model.

[0066] 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 comprises a valve seat structure (10) and a silencer (20); the valve seat structure (10) has a housing chamber (101); the housing chamber (101) comprises a plurality of position-limiting chamber sections which are connected in sequence along the installation direction of the silencer (20); the inner diameters of the plurality of position-limiting chamber sections tend to decrease in the installation direction of the silencer (20); the silencer (20) comprises a plurality of silencer blocks with different outer diameters; any one of the silencer blocks is position-limited and correspondingly installed in a position-limiting chamber section whose inner diameter matches the outer diameter of the silencer block.

2. The electronic expansion valve according to claim 1, wherein, The plurality of position-limiting cavity segments include a first position-limiting cavity segment (1011) and a second position-limiting cavity segment (1012) which are connected in sequence along the installation direction of the muffler (20), and the radial dimension of the first position-limiting cavity segment (1011) is greater than the radial dimension of the second position-limiting cavity segment (1012); the plurality of muffler blocks include a first muffler block (21) and a second muffler block (22), the first muffler block (21) is arranged in the first position-limiting cavity segment (1011) and is position-limited with the inner wall of the first position-limiting cavity segment (1011), and the second muffler block (22) is arranged in the second position-limiting cavity segment (1012) and is position-limited with the inner wall of the second position-limiting cavity segment (1012).

3. The electronic expansion valve according to claim 2, characterized in that, The silencer (20) further comprises a cushion block (23) arranged between the first silencer block (21) and the second silencer block (22); the outer periphery of the cushion block (23) is limitedly matched with the inner wall of the first limiting cavity section (1011); the first silencer block (21), the cushion block (23) and the second silencer block (22) are abutted in sequence; the inner diameter of the cushion block (23) is smaller than the outer diameter of the second silencer block (22).

4. The electronic expansion valve according to claim 3, characterized in that, The second muffler block (22) protrudes the second limiting cavity section (1012) on one side toward the cushion block (23) and extends into the first limiting cavity section (1011).

5. The electronic expansion valve according to claim 4, characterized in that, The side of the second silencer block (22) facing away from the cushion block (23) is flush with the opening of the second limiting cavity section (1012) facing away from the first limiting cavity section (1011), and in the axial direction of the electronic expansion valve, the size of the second silencer block (22) is larger than the size of the second limiting cavity section (1012).

6. The electronic expansion valve according to claim 1, characterized in that, The silencer (20) is laser welded in the accommodating cavity (101), or the silencer (20) is riveted in the accommodating cavity (101), or the silencer (20) is press-fitted in the accommodating cavity (101).

7. The electronic expansion valve according to claim 1, wherein The valve seat structure (10) comprises a valve seat portion (11) and a transition portion (12), wherein the transition portion (12) is at least partially disposed inside the valve seat portion (11), and the accommodating cavity (101) is located inside the valve seat portion (11) or inside the transition portion (12).

8. The electronic expansion valve according to claim 7, characterized in that, The valve seat portion (11) comprises a valve seat (111) and a valve seat core (112) located in the valve seat (111); the adapter portion (12) at least partially extends into the valve seat (111); the accommodating cavity (101) is located in the valve seat core (112); the valve seat core (112) is arranged in the valve seat (111), or the valve seat core (112) and the valve seat (111) are an integral structure.

9. The electronic expansion valve according to claim 8, wherein The silencer (20) is arranged in the accommodating cavity (101), and in the installation direction of the silencer (20), the silencer (20) has a first end (201) and a second end (202) arranged opposite to each other, the first end (201) abuts against the accommodating cavity (101), and the second end (202) protrudes out of the opening of the accommodating cavity (101) and abuts against an end of the adapter (12) extending into the valve seat (111).

10. The electronic expansion valve according to claim 7, wherein, The transition portion (12) comprises a first mating section (123) and a second mating section (124) which are connected to each other, wherein the first mating section (123) extends into the valve seat portion (11), and at least a portion of the second mating section (124) is located outside the valve seat portion (11) for transitioning to a first connecting pipe (31), and an outer diameter of the first mating section (123) is greater than an outer diameter of the second mating section (124), and an inner diameter of the first mating section (123) is greater than an inner diameter of the second mating section (124).

11. The electronic expansion valve according to claim 10, wherein, The transition portion (12) further comprises a fixing section (122) connected to an end of the first matching section (123) facing away from the second matching section (124); the fixing section (122) extends into the valve seat portion (11); and the area surrounded by the fixing section (122) forms the accommodating cavity (101).

12. The electronic expansion valve according to claim 11, characterized in that, A portion of the fixing section (122) that protrudes from the opening side of the first matching section (123) and that of the muffler (20) forms a riveted flange (121), and the riveted flange (121) is used to rivet the muffler (20) into the accommodating cavity (101).

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