Electronic expansion valve and air conditioning system

Abstract

The present application provides an electronic expansion valve and an air conditioning system. The electronic expansion valve comprises a valve seat structure and a silencing portion; the valve seat structure is provided with an accommodating cavity; the accommodating cavity comprises a plurality of limiting cavity sections sequentially communicated in the mounting direction of the silencing portion, and the inner diameters of the plurality of limiting cavity sections tend to decrease in the mounting direction of the silencing portion; and the silencing portion comprises a plurality of silencing blocks having different outer diameters, and any silencing block is correspondingly limited and mounted in a limiting cavity section the inner diameter of which matches the outer diameter of the silencing block. In the technical solution provided by the present application, by dividing the accommodating cavity into the plurality of sections having varying diameters, the corresponding mounting of the plurality of silencing blocks having different outer diameters is achieved, avoiding the situation of a mounting sequence error caused by confusion of the plurality of silencing blocks, and improving the mounting efficiency of the silencing portion.

Description

Electronic expansion valve and air conditioning system

[0001] This application claims priority to the patent application with the application number 202421721836.6, the title of "Electronic expansion valve and air conditioning system having the same", filed on July 18, 2024, with the State Intellectual Property Office of China;

[0002] This application claims priority to the patent application with the application number 202421716453.X, the title of "Electronic expansion valve", filed on July 18, 2024, with the State Intellectual Property Office of China;

[0003] This application claims priority to the patent application with the application number 202421713508.1, the title of "Valve seat structure and electronic expansion valve", filed on July 18, 2024, with the State Intellectual Property Office of China. TECHNICAL FIELD

[0004] The present application relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve and an air conditioning system. BACKGROUND

[0005] Currently, electronic expansion valves can be used in series reheating dehumidification fields. In this application, the electronic expansion valve is arranged between two indoor heat exchangers. Since the electronic expansion valve is arranged on the indoor side, the requirement for noise is also higher. Therefore, 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.

[0006] In the related art, the electronic expansion valve has a sound-absorbing part installed in a cavity inside a valve seat structure. The sound-absorbing part usually includes two or more sound-absorbing blocks, each of which corresponds to a different position of the electronic expansion valve in the axial direction. However, when installing multiple sound-absorbing blocks, different sound-absorbing blocks can be confused, resulting in an incorrect installation sequence, which affects the installation efficiency or the noise reduction effect of the sound-absorbing part. SUMMARY

[0007] The present application provides an electronic expansion valve and an air conditioning system to solve the problem of incorrect installation sequence of multiple sound-absorbing blocks in the prior art.

[0008] To solve the above problem, the present application provides an electronic expansion valve, which includes a valve seat structure and a sound-absorbing part. The valve seat structure has a receiving cavity, which includes multiple limiting cavity sections sequentially connected in the installation direction of the sound-absorbing part. The inner diameters of the multiple limiting cavity sections show a decreasing trend in the installation direction of the sound-absorbing part. The sound-absorbing part includes multiple sound-absorbing blocks with different outer diameters. Any sound-absorbing block is limited to be installed in a limiting cavity section with an inner diameter matching the outer diameter of the sound-absorbing block.

[0009] Further, the plurality of limiting cavity sections include a first limiting cavity section and a second limiting cavity section sequentially communicated along the mounting direction of the sound attenuation portion, the radial dimension of the first limiting cavity section is greater than the radial dimension of the second limiting cavity section; the plurality of sound attenuation blocks include a first sound attenuation block and a second sound attenuation block, the first sound attenuation block is arranged in the first limiting cavity section and is in limiting cooperation with the inner wall of the first limiting cavity section, and the second sound attenuation block is arranged in the second limiting cavity section and is in limiting cooperation with the inner wall of the second limiting cavity section.

[0010] Further, the sound attenuation portion further includes a spacer block arranged between the first sound attenuation block and the second sound attenuation block, the outer periphery of the spacer block is in limiting cooperation with the inner wall of the first limiting cavity section, the first sound attenuation block, the spacer block and the second sound attenuation block sequentially abut, and the inner diameter of the spacer block is smaller than the outer diameter of the second sound attenuation block.

[0011] Further, the side of the second sound attenuation block facing the spacer block protrudes out of the second limiting cavity section and extends into the first limiting cavity section.

[0012] Further, the side of the second sound attenuation block away from the spacer block is flush with the opening of the side of the second limiting cavity section away from the first limiting cavity section, and in the axial direction of the electronic expansion valve, the size of the second sound attenuation block is greater than the size of the second limiting cavity section.

[0013] Further, the sound attenuation portion is laser welded in the accommodating cavity, or the sound attenuation portion is riveted in the accommodating cavity, or the sound attenuation portion is press-fitted in the accommodating cavity.

[0014] Further, the valve seat structure includes a valve seat portion and an adapter portion, the adapter portion is at least partially arranged in the valve seat portion, and the accommodating cavity is located in the valve seat portion or the adapter portion.

[0015] Further, 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 in an integrated structure.

[0016] Further, the sound attenuation portion is arranged in the accommodating cavity, and in the mounting direction of the sound attenuation portion, the sound attenuation portion has oppositely arranged first and second ends, the first end abuts in the accommodating cavity, and the second end protrudes out of the opening of the accommodating cavity and abuts with the end of the adapter portion extending into the valve seat.

[0017] Further, the adapter portion includes a first fitting section and a second fitting section connected to each other, the first fitting section extends into the valve seat portion, and at least part of the second fitting section is located outside the valve seat portion for adapting the first connecting pipe, the outer diameter of the first fitting section is greater than the outer diameter of the second fitting section, and the inner diameter of the first fitting section is greater than the inner diameter of the second fitting section.

[0018] Further, the adapter portion further includes a fixing section connected to the end of the first fitting section away from the second fitting section, the fixing section extends into the valve seat portion, and the area surrounded by the fixing section forms the accommodating cavity.

[0019] Further, the part of the fixed section protruding away from the opening side of the first fitting section of the sound attenuation part forms a riveting flange, and the riveting flange is used for riveting the sound attenuation part in the accommodating cavity.

[0020] The technical scheme of the present application provides an electronic expansion valve, which comprises a valve seat structure and a sound attenuation part. The valve seat structure has an accommodating cavity, and the accommodating cavity comprises a plurality of limiting cavity sections sequentially communicated along the mounting direction of the sound attenuation part. The inner diameters of the plurality of limiting cavity sections have a decreasing trend along the mounting direction of the sound attenuation part. The sound attenuation part comprises a plurality of sound attenuation blocks with different outer diameters, and any sound attenuation block is limited to be mounted in a limiting cavity section with an inner diameter matched with the outer diameter of the sound attenuation block.

[0021] By dividing the accommodating cavity into a plurality of sections with different diameters (the first limiting cavity section and the second limiting cavity section), the technical scheme can realize corresponding mounting of a plurality of sound attenuation blocks (the first sound attenuation block and the second sound attenuation block) with different outer diameters, so as to avoid installation errors caused by confusion of the plurality of sound attenuation blocks, and improve the installation efficiency of the sound attenuation part and ensure the noise reduction effect of the sound attenuation part. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve the purpose of explaining the present application. The present application is not limited by the accompanying drawings.

[0023] FIG. 1 shows a structural schematic view of an electronic expansion valve provided by Embodiment One of the present application;

[0024] FIG. 2 shows an enlarged view of position A in FIG. 1;

[0025] FIG. 3 shows a structural schematic view of a valve seat core in FIG. 2;

[0026] FIG. 4 shows an enlarged view of position B in FIG. 2;

[0027] FIG. 5 shows a structural schematic view of an electronic expansion valve provided by Embodiment Two of the present application;

[0028] FIG. 6 shows an enlarged view of position C in FIG. 5;

[0029] FIG. 7 shows a structural schematic view of a valve seat core in FIG. 5;

[0030] FIG. 8 shows an enlarged view of position D in FIG. 6;

[0031] FIG. 9 shows a structural schematic view of an electronic expansion valve provided by Embodiment Three of the present application;

[0032] FIG. 10 shows an enlarged view of position E in FIG. 9;

[0033] Fig. 11 shows a structural schematic diagram of an electronic expansion valve according to an embodiment of the present application;

[0034] Fig. 12 shows an enlarged view of the F position in Fig. 11;

[0035] Fig. 13 shows a structural schematic diagram of an air conditioning system according to another embodiment of the present application.

[0036] In the above drawings, the following reference signs are used: 10, valve seat structure; 101, accommodating cavity; 1011, first limiting cavity section; 1012, second limiting cavity section; 102, valve port cavity; 103, annular groove; 11, valve seat part; 1101, limiting cavity; 1102, abutting surface; 111, valve seat; 112, valve seat core; 12, adapter part; 121, riveted flange; 122, fixed section; 123, first mating section; 12301, outer stepped surface; 124, second mating section; 125, annular stop protrusion; 12501, adapter interface; 13, fixing ring; 20, sound damping part; 201, first end; 202, second end; 21, first sound damping block; 22, second sound damping block; 23, spacer block; 31, first connecting pipe; 32, second connecting pipe; 100, compressor; 200, indoor heat exchanger; 210, first heat exchanger; 220, second heat exchanger; 300, outdoor heat exchanger; 400, electronic expansion valve. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0038] As shown in Figs. 1 to 12, the electronic expansion valve 400 comprises a valve seat structure 10 and a sound damping part 20, the valve seat structure 10 has an accommodating cavity 101, the accommodating cavity 101 comprises a plurality of limiting cavity sections sequentially communicated in the mounting direction of the sound damping part 20, the inner diameters of the plurality of limiting cavity sections show a decreasing trend in the mounting direction of the sound damping part 20, the sound damping part 20 comprises a plurality of sound damping blocks with different outer diameters, and any sound damping block is limited to be mounted in a limiting cavity section with an inner diameter matching the outer diameter of the sound damping block.

[0039] In some embodiments, by dividing the accommodating cavity 101 into multiple sections with different diameters (the first limiting cavity section 1011 and the second limiting cavity section 1012), the corresponding installation of multiple sound attenuation blocks (the first sound attenuation block 21 and the second sound attenuation block 22) with different outer diameters can be achieved, which can avoid the installation sequence error caused by the confusion of multiple sound attenuation blocks, and is beneficial to improve the installation efficiency of the sound attenuation part 20 and ensure the noise reduction effect of the sound attenuation part 20.

[0040] It should be noted that the installation direction of the sound attenuation part 20 in the present application is the direction parallel to the axial direction of the electronic expansion valve 400 when the sound attenuation part 20 is installed in the accommodating cavity 101. The valve seat part 11 also has a valve port cavity 102, which is located on the side of the accommodating cavity 101 away from the adapter part 12 and communicates with the accommodating cavity 101, and the accommodating cavity 101 is located downstream of the valve port cavity 102.

[0041] Specifically, in some embodiments, the multiple limiting cavity sections include the first limiting cavity section 1011 and the second limiting cavity section 1012 which are sequentially communicated along the installation direction of the sound attenuation part 20, and the radial dimension of the first limiting cavity section 1011 is greater than that of the second limiting cavity section 1012; the multiple sound attenuation blocks include the first sound attenuation block 21 and the second sound attenuation block 22, the first sound attenuation block 21 is arranged in the first limiting cavity section 1011 and limited by the inner wall of the first limiting cavity section 1011, and the second sound attenuation block 22 is arranged in the second limiting cavity section 1012 and limited by the inner wall of the second limiting cavity section 1012. As shown in FIG. 3, the inner diameter of the first limiting cavity section 1011 is adapted to the outer diameter of the first sound attenuation block 21, and the inner diameter of the second limiting cavity section 1012 is adapted to the outer diameter of the second sound attenuation block 22. The second sound attenuation block 22 abuts against the bottom wall of the second limiting cavity section 1012 to limit the displacement of the sound attenuation part 20 towards the valve port cavity 102. In this way, by limiting the installation of the first sound attenuation block 21 and the second sound attenuation block 22 through the first limiting cavity section 1011 and the second limiting cavity section 1012, the stability of the installation of the sound attenuation part 20 in the accommodating cavity 101 can be further ensured, and the sound attenuation part 20 can be prevented from falling off under the impact of fluid. The electronic expansion valve 400 is usually arranged in a two-way flow air conditioning system, and by limiting the displacement of the sound attenuation part 20 towards the valve port cavity 102 and away from the valve port cavity 102, the stability of the installation of the sound attenuation part 20 in the valve seat structure 10 can be improved as much as possible, and the use effect of the electronic expansion valve 400 can be ensured.

[0042] In some embodiments, the sound attenuation part 20 has a flow-through region and a decomposition region, and bubbles in the fluid flowing through the sound attenuation part 20 can be decomposed through the decomposition region. Specifically, the first sound attenuation block 21 and the second sound attenuation block 22 are each provided with a flow-through region and a decomposition region, and at least part of the flow-through region provided on the first sound attenuation block 21 is correspondingly provided with the decomposition region provided on the second sound attenuation block 22, and at least part of the flow-through region provided on the second sound attenuation block 22 is correspondingly provided with the decomposition region provided on the first sound attenuation block 21. In this way, the projection of at least part of the flow-through region of the first sound attenuation block 21 on the second sound attenuation block 22 coincides with the decomposition region of the second sound attenuation block 22, and the projection of at least part of the flow-through region of the second sound attenuation block 22 on the first sound attenuation block 21 coincides with the decomposition region of the first sound attenuation block 21. In this way, bubbles in the fluid mixed with impurities can flow through the flow-through region on the first sound attenuation block 21 or the second sound attenuation block 22 and then flow through the decomposition region on the first sound attenuation block 21 or the second sound attenuation block 22 again for decomposition, thereby improving the decomposition effect of the sound attenuation assembly and further improving the noise reduction capability of the sound attenuation assembly.

[0043] In some embodiments, the first sound attenuation block 21 and the second sound attenuation block 22 are filter screen sintered blocks, the first sound attenuation block 21 has a first through hole, and the second sound attenuation block 22 has a plurality of second through holes, the first through hole forms a flow-through region on the first sound attenuation block 21, and the second through hole forms a flow-through region on the second sound attenuation block 22. The filter screen sintered block is woven from metal wires or alloy wires, and then the metal wires or alloy wires are sintered with each other to form a uniform block-shaped filter material through high-temperature heating, which has high strength and stability and can effectively play a filtering effect.

[0044] It can be understood that the number of sound attenuation blocks included in the sound attenuation part 20 is not limited to two in the present application, and the division of the plurality of sections of the accommodating cavity 101 is also not limited to the first limiting cavity section 1011 and the second limiting cavity section 1012 in the present application. The division of the accommodating cavity 101 can be determined according to the number of sound attenuation blocks included in the actual sound attenuation part 20, and the radial dimensions of the plurality of limiting cavity sections divided by the accommodating cavity 101 as a whole show a decreasing trend in the installation direction of the sound attenuation part 20, so as to ensure the correct installation of the plurality of sound attenuation blocks of the sound attenuation part 20.

[0045] As shown in FIGS. 2 and 5, the sound attenuation part 20 further includes a spacer 23 arranged between the first sound attenuation block 21 and the second sound attenuation block 22, the outer periphery of the spacer 23 is limitedly matched with the inner wall of the first limiting cavity section 1011, the first sound attenuation block 21, the spacer 23 and the second sound attenuation block 22 are sequentially abutted, and the inner diameter of the spacer 23 is smaller than the outer diameter of the second sound attenuation block 22.

[0046] In this way, the two adjacent sound-absorbing blocks are spaced by the spacer 23, avoiding the situation that the sound-absorbing effect is affected due to the too close distance between the two sound-absorbing blocks, ensuring the reliability of the sound-absorbing part 20. On the other hand, by limiting the inner diameter of the spacer 23 and the outer diameter of the second sound-absorbing block 22, the reliability of the abutment of the two ends of the spacer 23 with the first sound-absorbing block 21 and the second sound-absorbing block 22 in the axial direction of the electronic expansion valve 400 is ensured. The spacer 23 in the embodiment of the application is in a ring structure. In some other embodiments not shown in the figure, the spacer 23 is multiple and is distributed in a ring shape.

[0047] Specifically, the side of the second sound-absorbing block 22 facing the spacer 23 protrudes into the second limiting cavity section 1012 and extends into the first limiting cavity section 1011.

[0048] In this way, when the side of the second sound-absorbing block 22 facing the spacer 23 is located in the second limiting cavity section 1012, the spacer 23 cannot effectively abut and limit the second sound-absorbing block 22, which may cause the second sound-absorbing block 22 to move in the second limiting cavity section 1012, ensuring the abutting and limiting effect of the spacer 23 on the second sound-absorbing block 22.

[0049] Further, the side of the second sound-absorbing block 22 away from the spacer 23 is flush with the opening of the side of the second limiting cavity section 1012 away from the first limiting cavity section 1011. In the axial direction of the electronic expansion valve 400, the size of the second sound-absorbing block 22 is greater than the size of the second limiting cavity section 1012.

[0050] In this way, the design of the second sound-absorbing block 22 protruding into the second limiting cavity section 1012 and the corresponding processing of the second sound-absorbing block 22 and the second limiting cavity section 1012 are facilitated, which is conducive to improving the processing efficiency.

[0051] The sound-absorbing part 20 is laser welded in the accommodating cavity 101; or, the sound-absorbing part 20 is riveted in the accommodating cavity 101 (as shown in the second embodiment of FIGS. 5-8 and the third embodiment of FIGS. 9 and 10); or, the sound-absorbing part 20 is press-fitted in the accommodating cavity 101 (as shown in the first embodiment of FIGS. 1-4); or, the valve seat structure 10 further comprises a fixing ring 13 laser welded on one side of the accommodating cavity 101. The fixing ring 13 is arranged on the rear side of the sound-absorbing part 20 along the mounting direction of the sound-absorbing part 20, so that the fixing ring 13 can support the sound-absorbing part 20. The sound-absorbing part 20 can be prevented from moving away from the valve port cavity 102 by the fixing ring 13, ensuring the stability of the mounting of the sound-absorbing part 20, so as to limit and mount the sound-absorbing part 20 in the accommodating cavity 101 (as shown in the fourth embodiment of FIGS. 11 and 12). In this way, the sound-absorbing part 20 is prevented from being detached from the accommodating cavity 101, ensuring the reliability and stability of the mounting and fixing of the sound-absorbing part 20. It can be understood that the sound-absorbing part 20 is not limited to the foregoing fixing methods, as long as it can be fixed in the accommodating cavity 101.

[0052] The valve seat structure 10 comprises a valve seat part 11 and an adapter part 12, in the first embodiment as shown in Figs. 1-4 and the second embodiment as shown in Figs. 5-8, the adapter part 12 is at least partially arranged in the valve seat part 11, the side of the valve seat part 11 and the bottom of the adapter part 12 are respectively used for connecting the second connecting pipe 32 and the first connecting pipe 31, in the embodiment as shown in Figs. 1-3, the accommodating cavity 101 is arranged in the valve seat part 11, wherein the valve seat part 11 comprises a valve seat 111 and a valve seat core 112 arranged in the valve seat 111, the adapter part 12 is at least partially arranged in the valve seat 111, and the accommodating cavity 101 is arranged in the valve seat core 112; the valve seat core 112 is arranged in the valve seat 111. The connection between the adapter part 12 and the first connecting pipe 31 and the connection between the valve seat part 11 and the second connecting pipe 32 can be connected by furnace welding, brazing or other welding methods, and the furnace welding connection is preferred.

[0053] In this way, the furnace welding object of the first connecting pipe 31 is changed from the valve seat part 11 to the adapter part 12 through the adapter part 12, the adapter part 12 and the first connecting pipe 31 are furnace welded, the sound attenuation part 20 arranged in the accommodating cavity 101 is separated from the first connecting pipe 31 by the adapter part 12, and the molten solder during furnace welding cannot penetrate to the sound attenuation part 20, thereby avoiding the situation that when the first connecting pipe 31 is directly abutted with the sound attenuation part 20 and the first connecting pipe 31 is furnace welded with the valve seat part 11, the molten solder easily penetrates from the gap between the first connecting pipe 31 and the valve seat part 11 to the sound attenuation part 20, thereby affecting the noise reduction effect of the sound attenuation part 20, and the noise reduction effect of the sound attenuation part 20 is ensured.

[0054] It should be noted that in some embodiments, 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. In the first embodiment as shown in Figs. 1-4 and the second embodiment as shown in Figs. 5-8, the valve seat core 112 and the valve seat 111 are a split structure, at least part of the outer wall of the valve seat core 112 is interference fit with the inner wall of the cavity of the valve seat 111, so as to ensure the reliability and coaxiality requirements of the installation of the valve seat core 112, and when the accommodating cavity 101 is formed in the valve seat part 11, it can be formed in the valve seat core 112 and then assembled in the valve seat 111. In the third embodiment as shown in Figs. 9 and 10 and the fourth embodiment as shown in Figs. 11 and 12, the valve seat core 112 and the valve seat 111 can be regarded as an integral structure, so as to improve the processing efficiency and ensure the structural strength, and when the accommodating cavity 101 is formed in the valve seat part 11, it is directly integrally formed in the valve seat part 11. It can be understood that the integration or split of the valve seat core 112 and the valve seat 111 and the installation connection design of the split can be adaptively designed according to the actual situation, which will not be exemplified here.

[0055] The outer wall of the adapter 12 extending into the cavity of the valve seat 111 is in interference fit with the inner wall of the cavity of the valve seat 111 to ensure the reliability and coaxiality of the installation of the adapter 12.

[0056] In the first embodiment shown in FIGS. 1-4, the installation direction is the axial direction of the electronic expansion valve 400 in which the first limiting cavity section 1011 faces the second limiting cavity section 1012. In the installation direction of the sound attenuation portion 20, the sound attenuation portion 20 has oppositely arranged first and second ends 201 and 202. 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 the end of the adapter 12 extending into the valve seat 111. It can be understood that the first end 201 of the first embodiment is the end of the second sound attenuation block 22 facing away from the first sound attenuation block 21 in the axial direction of the electronic expansion valve 400, and the second end 202 is the end of the first sound attenuation block 21 facing away from the second sound attenuation block 22 in the axial direction of the electronic expansion valve 400.

[0057] In this way, the sound attenuation portion 20 is limited and installed, and the installation effect of the first sound attenuation block 21 and the sound attenuation portion 20 as a whole is ensured. In the first embodiment, the end of the adapter 12 extending into the valve seat 11 abuts against the second end 202 of the first sound attenuation block 21 protruding out of the accommodating cavity 101, so as to ensure the abutting limitation and installation effect of the first sound attenuation block 21 and the sound attenuation portion 20 as a whole, and avoid the situation that the adapter 12 is not tightly abutted against the first sound attenuation block 21, causing the sound attenuation portion 20 to easily move in the accommodating cavity 101. On the other hand, in the first embodiment, the first connecting pipe 31 does not directly abut against the sound attenuation portion 20, but abuts against the sound attenuation portion 20 through the adapter 12. Compared with directly using the first connecting pipe 31 to abut against the sound attenuation portion 20, the abutting limitation of the sound attenuation portion 20 is more stable and reliable, which is conducive to ensuring the installation efficiency and reliability.

[0058] It should be noted that when the number of sound attenuation blocks is not limited to two in the present application, the two ends of the two sound attenuation blocks farthest away from each other in the axial direction of the electronic expansion valve 400 are the first and second ends 201 and 202, respectively.

[0059] The first end 201 abuts against the bottom wall of the accommodating cavity 101, i.e., the end of the second sound attenuation block 22 facing away from the first sound attenuation block 21 is flush with the bottom wall of the side of the second limiting cavity section 1012 facing away from the first limiting cavity section 1011. In the axial direction of the electronic expansion valve 400, the size of the sound attenuation portion 20 is greater than the size of the accommodating cavity 101. In this way, the design of the sound attenuation portion 20 protruding out of the accommodating cavity 101 and the corresponding processing of the sound attenuation portion 20 and the accommodating cavity 101 are facilitated, which is conducive to improving the processing efficiency.

[0060] It should be noted that, in the series reheating dehumidification system, the electronic expansion valve is arranged between the two indoor side heat exchangers, which determines that the pressure drop of the electronic expansion valve at a large opening degree is as small as possible in the normal air conditioning working condition, so as to ensure the energy efficiency of the air conditioning system, and the requirement for noise of the indoor side is higher, therefore, the sound attenuation structure (corresponding to the sound attenuation part 20 in the application) needs to be arranged at the valve port (corresponding to the valve port cavity 102 in the application), in order to reduce the throttling of the porous sound attenuation structure, the area of the porous sound attenuation structure can be increased and a large-diameter electronic expansion valve is used, in the related technology, the connecting pipe (corresponding to the first connecting pipe 31 in the application) directly extends into the valve seat (corresponding to the valve seat 111 in the application) and directly abuts against the sound attenuation part 20, the connecting pipe extending into the valve seat needs to have a larger outer diameter; and in the series reheating dehumidification system, the electronic expansion valve is mainly used in 1-3P units, the inner diameter of the indoor heat exchanger connecting pipe corresponding to the electronic expansion valve is smaller than that of the 3P or more units, the other end of the electronic expansion valve connecting pipe is connected with the indoor heat exchanger connecting pipe, which determines that the inner diameter of the other end of the connecting pipe is small, the diameters of the two ends of the electronic expansion valve connecting pipe are inconsistent and the span is large, and the scheme of abutting the connecting pipe against the sound attenuation mechanism makes the connecting pipe consist of three or more different pipe diameters, which is difficult to process and has high cost.

[0061] To solve the above problems, the adapter 12 has a first connecting end and a second connecting end arranged oppositely, the first connecting end is connected with the valve seat part 11, and the second connecting end is communicated with the first connecting pipe 31, and the inner diameter of the first end is larger than that of the second end. By setting the inner diameter of the first end of the adapter 12 to be larger than that of the second end, the adapter 12 itself can form a variable-diameter structure to adapt to the valve seat structure 10 and the flow pipe of different sizes, and the first connecting pipe 31 does not need to be provided with a variable-diameter structure to adapt to the large-diameter valve seat structure 10, but only needs to select appropriate raw materials to process the connecting piece according to the diameter of the electronic expansion valve 400, so as to reduce the processing and connecting difficulty of the first connecting pipe 31, which is beneficial to improve the overall processing efficiency of the electronic expansion valve 400, and such limitation can also prevent the adapter 12 from throttling the fluid passing through the valve port cavity 102, and ensure the flow efficiency of the fluid.

[0062] In some embodiments, the adapter 12 includes a first fitting section 123 and a second fitting section 124 connected with each other, one end of the first fitting section 123 away from the second fitting section 124 forms the first connecting end, one end of the second fitting section 124 away from the first fitting section 123 forms the second connecting end, the radial dimension of the first fitting section 123 is larger than that of the second fitting section 124 (the outer diameter of the first fitting section 123 is larger than that of the second fitting section 124, and the inner diameter of the first fitting section 123 is larger than that of the second fitting section 124), and the outer wall of the first fitting section 123 and the outer wall of the second fitting section 124 have an outer stepped surface 12301 serving as a positioning reference surface therebetween.

[0063] By the above arrangement, the first and second fitting sections 123 and 124 of the adapter 12 can form a variable-diameter structure, realizing the connection of the valve seat structure 10 and the first connecting pipe 31, reducing the processing difficulty of the first connecting pipe 31, and by arranging the adapter 12 in a segmented structure, the outer stepped surface 12301 formed between the first and second fitting sections 123 and 124 can form a larger positioning reference surface, facilitating the positioning of the subsequent nut, rotor, sleeve and other parts during installation, and facilitating the overall assembly of the electronic expansion valve 400. In the traditional technical solution, the connecting pipe (corresponding to the first connecting pipe 31 of the present application) is inserted into the valve body (corresponding to the valve seat structure 10 of the present application), and the filter screen (corresponding to the sound attenuation part 20 of the present application) is positioned by the connecting pipe. The end face of the valve body towards the connecting pipe forms a positioning reference surface. In order to ensure the flow area of the filter screen, the diameter of the filter screen is also set to be relatively large. Correspondingly, the diameter of the end of the connecting pipe connected to the valve body is also set to be relatively large. In order to reduce the occupied space of the electronic expansion valve 400, the volume of the valve body of the electronic expansion valve 400 is usually set to be relatively small. Thus, the thickness of the side wall of the valve body needs to be reduced, which will result in a smaller area of the positioning surface, which is not conducive to the positioning of the parts during installation. Moreover, the connecting pipe needs to be connected to the valve body by welding. After welding, the soldering material is prone to accumulate on the positioning reference surface due to melting, affecting the positioning reference of the positioning reference surface. In the present application, the first connecting pipe 31 is connected to the second fitting section 124, which can prevent the soldering material from flowing to and accumulating on the outer stepped surface 12301, thereby ensuring the accuracy of the positioning of the outer stepped surface 12301.

[0064] The adapter 12 (first fitting section 123) is inserted into the valve seat 11, and the first connecting pipe 31 is inserted into the second fitting section 124, and the first connecting pipe 31 is connected to the second fitting section 124 by welding. Specifically, the welding method can be selected from furnace welding, brazing or laser welding, etc.

[0065] In the first embodiment shown in FIGS. 1-4 and the second embodiment shown in FIGS. 5-8, the first fitting section 123 at least partially extends into the valve seat 111 and abuts against one end of the first sound attenuation block 21 protruding into the cavity 101, and at least part of the second fitting section 124 is located outside the valve seat 11 for connecting the first connecting pipe 31. By limiting the size (inner diameter and outer diameter) of the first and second fitting sections 123 and 124, the adapter 12 can be adapted to different sizes of the valve seat 11, and at the same time, the reduction of the radial dimension of the second fitting section 124 corresponds to the self-reduction of the adapter 12, so the end of the first connecting pipe 31 connected to the adapter 12 does not need to be reduced in diameter to adapt to the large-diameter valve seat 11, and only needs to be processed according to the appropriate raw material of the electronic expansion valve 400 to select the appropriate raw material to process the first connecting pipe 31, thereby reducing the processing difficulty of the first connecting pipe 31 and improving the processing efficiency.

[0066] 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 subjected to necking treatment, flaring treatment or no treatment, which is determined according to the actual situation. Compared with the case where the first connecting pipe 31 directly communicates with the valve seat part 11, at least one flaring process is saved by the end of the first connecting pipe 31 connected to the electronic expansion valve 400 through the adapter part 12.

[0067] In the second embodiment shown in FIGS. 5 to 8, the installation direction is the axial direction of the electronic expansion valve 400 with the first limiting cavity section 1011 facing the second limiting cavity section 1012. The difference between the second embodiment and the first embodiment is that the accommodating cavity 101 in the second embodiment is located in the adapter part 12. Specifically, the adapter part 12 in the second embodiment further includes a fixed section 122 connected to the side of the first fitting section 123 away from the second fitting section 124. The fixed section 122 and the first fitting section 123 extend into the valve seat 111 of the valve seat part 11, and the area surrounded by the fixed section 122 forms the accommodating cavity 101.

[0068] In the installation direction of the sound attenuation part 20, the portion of the fixed section 122 protruding away from the opening side of the first fitting section 123 forms a riveting flange 121 (which can also be understood as the riveting flange 121 being formed at the opening of the first limiting cavity section 1011 of the adapter part 12) for riveting the sound attenuation part 20 in the accommodating cavity 101. In this way, the sound attenuation part 20 is conveniently installed and limited, which is conducive to ensuring the reliability of the electronic expansion valve 400. At the same time, the sound attenuation part 20 and the adapter part 12 can be independently installed, and then the whole is installed together with the valve seat part 11, which is conducive to improving the assembly efficiency of the electronic expansion valve 400 while ensuring the reliability of the installation of the sound attenuation part 20.

[0069] In the third embodiment shown in FIGS. 9 to 10 and the fourth embodiment shown in FIGS. 11 to 12, the difference from the first and second embodiments is that the outer side wall of the valve seat structure 10 has an abutting surface 1102, and the end face of the first end of the adapter part 12 abuts with the abutting surface 1102. In the third and fourth embodiments, the end of the valve seat part 11 is inserted into the first fitting section 123. Through the above arrangement, the abutting surface 1102 can limit the displacement of the adapter part 12 relative to the valve seat part 11, provide a positioning basis for the adapter part 12, and ensure that the adapter part 12 can be installed in place. The outer wall of the valve seat part 11 and the inner wall of the first fitting section 123 can be interference fit. In some embodiments, the adapter part 12 and the side wall of the valve seat part 11 are connected by laser welding. Laser welding can be accurately focused on a very small area, achieving high-precision welding, and the heat-affected zone generated by laser welding is relatively small, reducing the impact of welding work on the adapter part 12 and ensuring the structural performance of the adapter part 12 itself.

[0070] In the first embodiment shown in FIGS. 1-4 and the second embodiment shown in FIGS. 5-8, the valve seat part 11 has a limiting cavity 1101, an opening of the limiting cavity 1101 is located at a bottom wall of the valve seat part 11, the adapter part 12 is at least partially arranged in the limiting cavity 1101, and the adapter part 12 and the valve seat part 11 form an annular weld at the opening of the limiting cavity 1101. In this embodiment, the adapter part 12 and the valve seat part 11 are laser welded at the annular weld. In this way, the adapter part 12 is used to realize the furnace welding adapter of the first connecting pipe 31, which facilitates the welding of the operator and the implementation of the corresponding welding equipment, and improves the convenience and reliability of the welding.

[0071] Specifically, the first fitting section 123 is at least partially arranged in the limiting cavity 1101, and a bottom of the first fitting section 123 and the bottom of the valve seat part 11 form an annular weld at the opening of the limiting cavity 1101. In this way, the limiting installation of the adapter part 12 is facilitated, and the reliability of the installation of the adapter part 12 and the reliability of the formation of the annular weld at the bottom of the valve seat part 11 are ensured.

[0072] As shown in FIGS. 2 and 6, the bottom wall of the first fitting section 123 is an outer stepped surface 12301, which is located between the outer walls of the first fitting section 123 and the second fitting section 124. As shown in FIG. 6, the outer stepped surface 12301 protrudes out of the limiting cavity 1101 and forms a positioning reference surface, or as shown in FIG. 2, the outer stepped surface 12301 is flush with the surface where the opening of the limiting cavity 1101 is located and forms a positioning reference surface. In this way, compared with the case where the valve seat part 11 is directly connected to the first connecting pipe 31 and the end surface of the valve seat part 11 facing the one end of the first connecting pipe 31 is used as the positioning reference surface, the area of the positioning reference surface is increased, and due to the arrangement of the adapter part 12, the placement position of the welding ring for furnace welding of the first connecting pipe 31 is far away from the positioning reference surface, and during the furnace welding, the molten solder will not be laid on the positioning reference surface, which will not affect the positioning during the subsequent assembly and welding. The influence on the positioning reference surface is almost none. At least partially arranged in the limiting cavity 1101, the outer wall of the first fitting section 123 and the inner wall of the limiting cavity 1101 are in interference fit, which facilitates the limiting installation of the first fitting section 123. In this embodiment, the interference height between the first fitting section 123 and the inner wall of the limiting cavity 1101 can be adjusted according to the actual situation to avoid the case that the interference section is too long and the pressing is difficult.

[0073] In the embodiment one as shown in FIGS. 1-4, the first fitting section 123 is entirely disposed in the limiting cavity 1101, the bottom wall of the first fitting section 123 is flush with the bottom wall of the valve seat part 11, and an annular weld is formed between the bottom wall of the first fitting section 123 and the bottom wall of the valve seat part 11 where the opening is located. In the embodiment one, the annular weld is formed at the gap opening between the bottom wall of the first fitting section 123 and the bottom wall of the valve seat part 11 where the opening is located, and the operator can perform vertical welding on the annular weld from the bottom of the valve seat part 11 to ensure the reliability of the welding. It can be understood that the difference between the radial dimension of the annular weld and the radial dimension of the second fitting section 124 can be adjusted according to actual conditions, as long as the first connecting pipe 31 does not interfere with the welding process.

[0074] Further, in order to avoid the case that the height of the laser weld mark after welding is too high, the bottom wall of the first fitting section 123 and / or the bottom wall of the valve seat part 11 has an annular groove 103 at the annular weld. In this way, the area in the annular groove 103 can be used as the annular weld, and the laser weld mark after welding formed by welding is entirely or mostly located in the annular groove 103, thereby hiding the laser weld mark after welding, so that the laser weld mark after welding formed by laser welding does not protrude from the positioning reference surface or the part protruding from the positioning reference surface has little effect on the positioning reference effect of the positioning reference surface, and does not affect the positioning during the subsequent assembly and welding, thereby ensuring the reliability of the welding and the reliability of the positioning reference surface.

[0075] The cross-sectional shape of the annular groove 103 can be adaptively adjusted according to actual conditions, and is not limited to the triangular shape in the embodiment one shown in FIG. 4.

[0076] In other embodiments, the bottom wall of the first fitting section 123 is spaced apart from the bottom wall of the valve seat part 11 in the axial direction of the valve seat structure. For example, in the embodiment two as shown in FIGS. 5-8, the first fitting section 123 is partially disposed in the limiting cavity 1101, and the annular weld is formed between the side wall of the first fitting section 123 and the bottom wall of the valve seat part 11 where the opening of the limiting cavity 1101 is located; or, in another embodiment not shown in the figure, the first fitting section 123 is entirely disposed in the limiting cavity 1101, and the annular weld is formed between the bottom wall of the first fitting section 123 and the inner wall of the limiting cavity 1101, which facilitates the operator to perform inclined laser welding from the bottom of the valve seat part 11, is beneficial to the focusing during welding, and improves the convenience and reliability of the welding.

[0077] The opening of the bottom protruding limiting cavity 1101 of the first fitting section 123 in the second embodiment shown in FIGS. 5-8 is spaced apart from the bottom wall of the valve seat portion 11 in the axial direction of the valve seat structure by a distance H, where 0.1 mm≤H≤1 mm. By limiting H, the height of the laser welding trace after welding of the first fitting section 123 formed by welding can be avoided, so that the laser welding trace after welding formed by laser welding does not protrude from the positioning reference surface or the portion protruding from the positioning reference surface has little effect on the positioning reference effect of the positioning reference surface, which does not affect the positioning during subsequent assembly and welding.

[0078] Specifically, in the first embodiment shown in FIGS. 1-4 and the second embodiment shown in FIGS. 5-8, the adapter portion 12 further has an annular stop protrusion 125, which is disposed between the first fitting section 123 and the second fitting section 124 and protrudes inward in the radial direction of the adapter portion 12. The inner diameter of the annular stop protrusion 125 is smaller than the inner diameter of the second fitting section 124, and the area surrounded by the annular stop protrusion 125 forms an adapter port 12501. One end of the first connection pipe 31 is disposed in the second fitting section 124 and stop-fitted with the annular stop protrusion 125, and the adapter port 12501 is in communication with the opening of the first connection pipe 31. In the first embodiment and the second embodiment, one end of the first connection pipe 31 penetrates into the second fitting section 124 and abuts against the annular stop protrusion 125, the penetration depth of the first connection pipe 31 is limited by the annular stop protrusion 125, the outer diameter of the first connection pipe 31 is adapted to the inner diameter of the second fitting section 124, and the inner diameter of the first connection pipe 31 is adapted to the radial dimension of the adapter port 12501, which facilitates the limited installation of the first connection pipe 31 and the molding of the adapter port 12501, and at the same time, achieves smooth transition of the refrigerant flowing through the adapter port 12501 and the first connection pipe 31, thereby reducing refrigerant flow noise.

[0079] It should be noted that the adapter portion 12 can be a stretch part, a finished part, etc. In some embodiments, since multiple steps and flow channels need to be machined inside the adapter portion 12, and the adapter portion 12 needs to be press-fitted into the valve seat portion 11, the dimensional accuracy of the adapter portion 12 is required to be high, so the adapter portion 12 in some embodiments is a finished part. It can be understood that the adapter portion 12 can be finished as a whole, or first stamped and then finished (the stepped portion is finished), or first cold-headed and then finished, or formed by material turning, or made of a pipe, which is not exemplified here.

[0080] It should be noted that the first connecting pipe 31 can be processed by stamping or stretching process to reduce the processing difficulty of the first connecting pipe 31 and reduce the manufacturing cost of the first connecting pipe 31, and the second connecting pipe 32 is the same. In some embodiments of the present application, the first connecting pipe 31 is a straight hole structure along the extension direction of the first connecting pipe 31, which can simplify the structure of the first connecting pipe 31 and facilitate the processing and forming of the first connecting pipe 31. In some other embodiments of the present application, the first connecting pipe 31 includes a straight segment and a matching segment connected to each other along the extension direction of the first connecting pipe 31, the straight segment is a straight hole structure, the matching segment is an expanded hole structure or a reduced hole structure, the straight segment is connected to the adapter 12, and the matching segment is connected to the flow pipeline. In this way, the first connecting pipe 31 can be easily connected to the flow pipeline of the client. Specifically, the straight hole structure in the present application refers to that the inner diameter of the pipeline remains unchanged along the extension direction of the first connecting pipe 31; the expanded hole structure in the present application refers to that the inner diameter of the matching segment connected to the flow pipeline is larger than the inner diameter of the straight segment; and the reduced hole structure in the present application refers to that the inner diameter of the matching segment connected to the flow pipeline is smaller than the inner diameter of the straight segment.

[0081] The adapter port 12501 is a horn port, or the side of the adapter port 12501 away from the first connecting pipe 31 has a horn port, and the side with a smaller opening of the horn port is in communication with the first connecting pipe 31 and the radial dimension is adapted to the inner diameter of the first connecting pipe 31. In this way, by providing the horn port, on the one hand, it can be ensured that there is no burr at this position (the adapter 12 is a finished product, and burrs are easily generated when the straight channel is formed); on the other hand, the second connecting pipe 32 is also connected to the side wall of the valve seat part 11 of the electronic expansion valve 400. In the case that the fluid flows from the first connecting pipe 31 to the second connecting pipe 32, since the inner diameter of the first horn port gradually increases along the first connecting pipe 31 towards the valve port cavity 102, it provides a buffering effect for the fluid entering from the first connecting pipe 31, and vortex is not easily formed, the pressure gradually changes, the flow rate is reduced, the impact of high-speed airflow on the filter screen is reduced, that is, the flow rate of the refrigerant entering the valve port position is reduced, the turbulent kinetic energy is reduced, and thus the noise is reduced.

[0082] As shown in FIG. 13, another embodiment of the present application further provides an air conditioning system, the electronic expansion valve provided by the present application is applied to the air conditioning system shown in FIG. 13, the air conditioning system comprises a compressor 100, an indoor heat exchanger 200 and an outdoor heat exchanger 300 which are in communication with each other, the indoor heat exchanger 200 comprises a first heat exchanger 210 and a second heat exchanger 220, and the electronic expansion valve 400 is arranged between the first heat exchanger 210 and the second heat exchanger 220, the electronic expansion valve 400 is the electronic expansion valve 400 described above. When the air conditioning system is in a cooling and heating mode, the electronic expansion valve 400 is in a fully open state, and the first heat exchanger 210 and the second heat exchanger 220 can be regarded as an integral heat exchanger to release heat or absorb heat; when the air conditioning system is in a dehumidification mode, the second heat exchanger 220 is a condenser, and the refrigerant fluid releases heat through the second heat exchanger 220, and then flows out of the second heat exchanger 220 and enters the electronic expansion valve 400, the electronic expansion valve 400 can control the flow of the refrigerant fluid, so that the refrigerant fluid throttles and depressurizes through the electronic expansion valve 400 at a small flow rate, at this time the first heat exchanger 210 acts as an evaporator to absorb heat, and the fan drives the indoor humid air to pass through the heat-absorbing first heat exchanger 210 to make the water vapor condense, thereby achieving the dehumidification effect, at the same time, the indoor second heat exchanger 220 acts as a condenser to make the indoor air temperature rise, that is, the air passes through the first heat exchanger 210 to condense and dehumidify, and passes through the second heat exchanger 220 to warm up, and under the action of the fan, it is always circulated, thereby achieving the effect of dehumidification without temperature drop, and improving the user experience. Moreover, by applying the technical solution provided by the present application, the overall processing difficulty of the electronic expansion valve can be reduced, the overall manufacturing cost of the first connecting pipe 31 can be reduced, and the processing difficulty and manufacturing cost of the overall air conditioning system can be reduced.

[0083] Specifically, the first heat exchanger 210 and the second heat exchanger 220 are connected through a flow pipe, the electronic expansion valve 400 is arranged on the flow pipe, the first connecting pipe 31 of the electronic expansion valve 400 is connected with the flow pipe, and the minimum diameter at the valve port cavity 102 is greater than the inner diameter of the flow pipe, so that the flow of the fluid through the electronic expansion valve 400 can be ensured without obvious throttling, and the normal flow of the fluid between the first heat exchanger 210 and the second heat exchanger 220 can be ensured.

[0084] Specifically, in the air conditioning system provided by the present application, the inner diameter of the first connecting pipe 31 is greater than the inner diameter of the flow pipe. Through the above arrangement, when the first connecting pipe 31 is connected with the flow pipe, the pressure drop of the fluid flowing through the first connecting pipe 31 and the electronic expansion valve 400 provided by the present application can be avoided, thereby further ensuring the flow efficiency of the refrigerant fluid flowing through the electronic expansion valve 400.

[0085] The above merely provides some embodiments of the present application, but not for limiting the present application. For those skilled in the art, the present application can have various modifications and changes. Any modified, equivalent replaced, improved and the like, which is within the spirit and principle of the present application, should be included in the protection scope of the present application.

Claims

1. An electronic expansion valve characterized by, The electronic expansion valve comprises a valve seat structure (10) and a sound attenuation part (20), the valve seat structure (10) has a containing cavity (101) comprising multiple limiting cavity sections sequentially communicated along the mounting direction of the sound attenuation part (20), the inner diameters of the multiple limiting cavity sections have a decreasing trend along the mounting direction of the sound attenuation part (20), the sound attenuation part (20) comprises multiple sound attenuation blocks with different outer diameters, and any one of the sound attenuation blocks is limitedly mounted in the limiting cavity section with an inner diameter matched with the outer diameter of the sound attenuation block.

2. The electronic expansion valve according to claim 1, characterized in that The multiple limiting cavity sections comprise a first limiting cavity section (1011) and a second limiting cavity section (1012) sequentially communicated along the mounting direction of the sound attenuation part (20), the radial dimension of the first limiting cavity section (1011) is greater than that of the second limiting cavity section (1012); and the multiple sound attenuation blocks comprise a first sound attenuation block (21) and a second sound attenuation block (22), the first sound attenuation block (21) is arranged in the first limiting cavity section (1011) and limitedly matched with the inner wall of the first limiting cavity section (1011), and the second sound attenuation block (22) is arranged in the second limiting cavity section (1012) and limitedly matched with the inner wall of the second limiting cavity section (1012).

3. The electronic expansion valve according to claim 2, wherein The sound attenuation part (20) further comprises a spacer block (23) arranged between the first sound attenuation block (21) and the second sound attenuation block (22), the outer periphery of the spacer block (23) is limitedly matched with the inner wall of the first limiting cavity section (1011), the first sound attenuation block (21), the spacer block (23) and the second sound attenuation block (22) are sequentially abutted, and the inner diameter of the spacer block (23) is smaller than the outer diameter of the second sound attenuation block (22).

4. The electronic expansion valve according to claim 3, wherein The side of the second sound attenuation block (22) facing the spacer block (23) protrudes out of the second limiting cavity section (1012) and extends into the first limiting cavity section (1011).

5. The electronic expansion valve according to claim 4, wherein The side of the second sound attenuation block (22) away from the spacer block (23) is flush with the opening of the side of the second limiting cavity section (1012) away from the first limiting cavity section (1011), and in the axial direction of the electronic expansion valve, the size of the second sound attenuation block (22) is greater than that of the second limiting cavity section (1012).

6. The electronic expansion valve according to claim 1, wherein The sound attenuation part (20) is laser welded in the containing cavity (101), or the sound attenuation part (20) is riveted in the containing cavity (101), or the sound attenuation part (20) is press-fitted in the containing cavity (101), or the valve seat structure (10) further comprises a fixing ring (13) laser welded on one side of the containing cavity (101), the fixing ring (13) is arranged on the back side of the sound attenuation part (20) along the mounting direction of the sound attenuation part (20) to limit the mounting of the sound attenuation part (20) in the containing cavity (101).

7. The electronic expansion valve according to claim 1, wherein The valve seat structure (10) comprises a valve seat part (11) and an adapter part (12), the adapter part (12) is at least partially arranged in the valve seat part (11), and the accommodating cavity (101) is located in the valve seat part (11) or the adapter part (12).

8. The electronic expansion valve according to claim 7, characterized in that The valve seat part (11) comprises a valve seat (111) and a valve seat core (112) arranged in the valve seat (111), the adapter part (12) is at least partially arranged in the valve seat (111), and 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) is an integral structure with the valve seat (111).

9. The electronic expansion valve according to claim 7, wherein The adapter part (12) comprises a fixed segment (122), a first matching segment (123) and a second matching segment (124) connected in sequence, the fixed segment (122) and at least part of the first matching segment (123) are arranged in the valve seat part (11), at least part of the second matching segment (124) is located outside the valve seat part (11) for adapting the first connecting pipe (31), and the area surrounded by the fixed segment (122) forms the accommodating cavity (101).

10. The electronic expansion valve according to claim 9, characterized in that The fixed segment (122) protrudes from the opening side of the first matching segment (123) to form a riveting flange (121) for riveting the sound reduction part (20) in the accommodating cavity (101).

11. The electronic expansion valve according to claim 1, wherein The valve seat structure (10) comprises a valve seat part (11) and an adapter part (12) for adapting the first connecting pipe (31) and the second connecting pipe (32) respectively, the valve seat part (11) has a limiting cavity (1101), the opening of the limiting cavity (1101) is located at the bottom wall of the valve seat part (11), the adapter part (12) is at least partially arranged in the limiting cavity (1101), and the adapter part (12) and the valve seat part (11) form an annular weld at the opening of the limiting cavity (1101).

12. The electronic expansion valve according to claim 11, wherein The adapter part (12) comprises a first matching segment (123) which is limitedly matched with the inner wall of the limiting cavity (1101), the first matching segment (123) is at least partially arranged in the limiting cavity (1101), and the bottom of the first matching segment (123) and the bottom of the valve seat part (11) form the annular weld at the opening of the limiting cavity (1101).

13. The electronic expansion valve according to claim 12, wherein The first matching segment (123) is entirely arranged in the limiting cavity (1101), the bottom wall of the first matching segment (123) is flush with the bottom wall of the valve seat part (11), and the bottom wall of the first matching segment (123) and the bottom wall of the valve seat part (11) at the opening of the limiting cavity (1101) form the annular weld.

14. The electronic expansion valve according to claim 13, wherein The bottom wall of the first matching segment (123) and / or the bottom wall of the valve seat part (11) has an annular groove (103) at the annular weld.

15. The electronic expansion valve of claim 12, wherein, The bottom wall of the first matching segment (123) and the bottom wall of the valve seat part (11) are spaced in the axial direction of the electronic expansion valve.

16. The electronic expansion valve according to claim 15, wherein The bottom of the first fitting section (123) protrudes from the opening of the limiting cavity (1101), and the interval distance between the bottom wall of the first fitting section (123) and the bottom wall of the valve seat portion (11) where the opening of the limiting cavity (1101) is located in the axial direction of the electronic expansion valve is H, and 0.1mm≤H≤1mm.

17. The electronic expansion valve of claim 11, wherein, The adapter portion (12) and the valve seat portion (11) are laser welded at the annular weld.

18. The electronic expansion valve of claim 1, wherein, The valve seat structure (10) comprises a valve seat portion (11) and an adapter portion (12) for adapting a first connecting pipe (31) and a second connecting pipe (32) respectively, the accommodating cavity (101) is located in the valve seat portion (11), the valve seat portion (11) further has a valve port cavity (102) in communication with the accommodating cavity (101), the accommodating cavity (101) is located downstream of the valve port cavity (102), the adapter portion (12) has oppositely arranged first and second connecting ends, the first connecting end is connected with the valve seat portion (11), and the second connecting end is in communication with the first connecting pipe (31), and the inner diameter of the first connecting end is larger than that of the second connecting end.

19. The electronic expansion valve of claim 18, wherein, The adapter portion (12) comprises a first fitting section (123) and a second fitting section (124) connected with each other, one end of the first fitting section (123) away from the second fitting section (124) forms the first connecting end, one end of the second fitting section (124) away from the first fitting section (123) forms the second connecting end, the inner diameter of the first fitting section (123) is larger than that of the second fitting section (124), and an outer stepped surface (12301) serving as a positioning reference surface is formed between the outer wall of the first fitting section (123) and the outer wall of the second fitting section (124).

20. The electronic expansion valve of claim 19, wherein, The adapter portion (12) has an annular stop protrusion (125) therein, the annular stop protrusion (125) is arranged between the first fitting section (123) and the second fitting section (124) and protrudes inwardly in the radial direction of the adapter portion (12), the inner diameter of the annular stop protrusion (125) is smaller than that of the second fitting section (124), an adapter port (12501) is formed around the annular stop protrusion (125), one end of the first connecting pipe (31) is arranged in the second fitting section (124) and stop-fitted with the annular stop protrusion (125), and the adapter port (12501) is in communication with the opening of the first connecting pipe (31).

21. The electronic expansion valve of claim 18, wherein, The adapter portion (12) is inserted and fitted with the valve seat portion (11), the valve seat portion (11) has an abutting surface (1102) on the outer side wall thereof, the end surface of the first connecting end is abuttingly fitted with the abutting surface (1102), and the side wall of the adapter portion (12) and the valve seat portion (11) are connected by laser welding.

22. An air conditioning system comprising: The air conditioning system comprises a compressor (100), an indoor heat exchanger (200) and an outdoor heat exchanger (300) which are communicated with each other, the indoor heat exchanger (200) comprises a first heat exchanger (210) and a second heat exchanger (220), an electronic expansion valve (400) is arranged between the first heat exchanger (210) and the second heat exchanger (220), and the electronic expansion valve (400) is the electronic expansion valve according to any one of claims 1 to 21.

23. The air conditioning system of claim 22, wherein, The first heat exchanger (210) and the second heat exchanger (220) are connected through a flow passage pipe, the electronic expansion valve (400) is arranged on the flow passage pipe, a first connecting pipe (31) of the electronic expansion valve (400) is connected with the flow passage pipe, and a caliber of a valve port cavity (102) of the electronic expansion valve is greater than an inner diameter of the flow passage pipe.

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