Silencing assembly and electronic expansion valve provided with same

Abstract

A silencing assembly, comprising a silencing structure. The silencing structure is provided with a circulation area and a decomposition area. Bubbles in a liquid flowing through the silencing assembly can be decomposed by means of the decomposition area. The silencing structure comprises: a first silencing block (10) and a second silencing block (20), both of which are filter screen sintering blocks. The first silencing block and the second silencing block are arranged at an interval in a flowing direction of liquid. The first silencing block and the second silencing block are both provided with a circulation area and a decomposition area. At least part of the circulation area provided on the first silencing block is disposed corresponding to the decomposition area provided on the second silencing block; and at least part of the circulation area provided on the second silencing block is disposed corresponding to the decomposition area provided on the first silencing block. The silencing assembly can improve a noise reduction effect. Also disclosed is an electronic expansion valve provided with the silencing assembly.

Description

Silencing assembly and electronic expansion valve with same

[0001] The present application claims priority to the patent application No. 2024207391058 filed on April 10, 2024 in the China National Intellectual Property Office and entitled "Silencing assembly and electronic expansion valve with same"; the present application claims priority to the patent application No. 2024223236268 filed on September 23, 2024 in the China National Intellectual Property Office and entitled "Silencing assembly and electronic expansion valve with same". TECHNICAL FIELD

[0002] The present application relates to the technical field of electronic expansion valve silencing, in particular to a silencing assembly and an electronic expansion valve with same. BACKGROUND

[0003] At present, during the working process of the electronic expansion valve, the two-phase fluid passing through the electronic expansion valve will generate bubbles of different sizes before and after throttling. When the bubbles flow in the pipeline, discontinuous noise is generated, which affects the use experience of the electronic expansion valve.

[0004] In the prior art, a silencing structure is usually arranged on the electronic expansion valve. The larger bubbles in the fluid are broken and decomposed into smaller bubbles when flowing through the silencing structure, so as to realize the grooming of the bubbles and reduce the noise of the fluid flowing in the pipeline. The existing silencing structure is usually arranged at the connection between the electronic expansion valve and the pipeline. The silencing structure is fixed by a fixing structure, and a through hole is also arranged on the fixing structure, so that the impurities in the fluid can flow through the fixing structure to prevent the silencing structure from being clogged. However, when the fluid flows through the fixing structure, the fixing structure will be shaken due to the impact of the fluid, which will generate a certain noise. Moreover, this arrangement will make the silencing assembly unable to cover all the fluid flow channels, which will cause part of the fluid to flow through the fixing structure instead of the silencing structure when flowing through the silencing structure. As a result, part of the bubbles cannot be decomposed by the silencing assembly, which affects the noise reduction effect of the silencing assembly.

[0005] SUMMARY

[0006] The present application provides a silencing assembly and an electronic expansion valve with same to solve the problem of poor noise reduction effect of the silencing assembly in the prior art.

[0007] According to one aspect of the present application, a silencer assembly is provided, which includes a silencer structure, the silencer structure having a circulation area and a decomposition area, and bubbles in the fluid flowing through the silencer assembly can be decomposed through the decomposition area. The silencer structure includes: a first silencer block and a second silencer block, the first silencer block and the second silencer block are filter sintered blocks, the first silencer block and the second silencer block are spaced apart along the circulation direction of the fluid, and the first silencer block and the second silencer block are both provided with a circulation area and a decomposition area, wherein the circulation area at least partially provided on the first silencer block is corresponding to the decomposition area provided on the second silencer block, and the circulation area at least partially provided on the second silencer block is corresponding to the decomposition area provided on the first silencer block.

[0008] Using the technical solution provided in this application, a first muffler block and a second muffler block of the muffler structure are both provided with a circulation area and a decomposition area. Larger bubbles in the two-phase fluid flowing through the decomposition area are decomposed into smaller bubbles in the decomposition area, thereby making the bubble size in the fluid uniform, thereby reducing the abnormal noise generated by unstable, discontinuous large bubbles during flow. When impurities in the fluid cannot pass through the decomposition area, it is easy to cause the decomposition area to become dirty and clogged. By providing the circulation area, impurities can flow through the circulation area through the muffler assembly, preventing the muffler assembly from clogging. At least a portion of the circulation area provided on the first muffler block is provided to correspond to the decomposition area provided on the second muffler block, and at least a portion of the circulation area provided on the second muffler block is provided to correspond to the decomposition area provided on the first muffler block, so that the projection of at least a portion of the circulation area of ​​the first muffler block on the second muffler block overlaps with the decomposition area of ​​the second muffler block, and at least a portion of the projection of the circulation area of ​​the second muffler block on the first muffler block overlaps with the decomposition area of ​​the first muffler block. This allows bubbles in a fluid mixed with impurities to flow through the circulation area of ​​the first or second muffler block and then flow through the decomposition area of ​​the first or second muffler block for decomposition. Compared to traditional solutions that require a separate fixed structure to secure the muffler structure and allow impurities to flow through the fixed structure, this solution increases the area within the muffler assembly for bubble decomposition, improving the decomposition effect of the muffler assembly and, in turn, enhancing the noise reduction capability of the muffler assembly.

[0009] Furthermore, the first muffler block has a first through-hole, and the second muffler block has multiple second through-holes. The first through-hole forms a flow area on the first muffler block, and the multiple second through-holes form a flow area on the second muffler block. This arrangement allows for the formation of relatively large diameter holes in the filter sintered block, preventing impurities in the fluid from passing through the filter sintered block, thereby preventing the filter sintered block from becoming clogged.

[0010] Furthermore, along the flow direction of the fluid, the projection of the first through hole and the projection of the second through hole do not overlap. Through the above arrangement, more fluid can pass through the decomposition area of ​​the silencer assembly, thereby improving the silencer effect of the silencer assembly.

[0011] Furthermore, the pore size of the first and second muffler blocks is 0.12-0.35 mm. Through the above arrangement, the impact of the first and second muffler blocks on fluid flow can be reduced without affecting the decomposition effect of the first and second muffler blocks.

[0012] Furthermore, the porosity of the first and second muffler blocks is 45%-95%. Through the above arrangement, the noise reduction effect of the muffler structure can be improved while ensuring the smoothness of fluid circulation.

[0013] Furthermore, the muffler assembly further includes a support structure disposed between the first and second muffler blocks, with the support structure forming a gap between the first and second muffler blocks. This arrangement allows impurities to flow through the first and second muffler blocks, preventing clogging of the first or second muffler blocks.

[0014] Furthermore, a support ring is provided between the first and second muffler blocks, and the support ring is provided on the periphery of the second muffler block. Through the above arrangement, the stability of the first and second muffler blocks can be ensured.

[0015] Furthermore, the support ring has a flow channel with an area of ​​S2, and the maximum projected area of ​​the muffler structure along the flow direction is S3, where S2 ≥ 0.8 * S3. This arrangement reduces the flow resistance experienced by the fluid flowing through the support ring while ensuring the support ring's support for the first muffler block.

[0016] Furthermore, the silencer assembly also includes a fixing sleeve, both ends of the fixing sleeve have openings for fluid to pass through, and the first silencer block and the second silencer block are arranged in the cavity of the fixing sleeve at intervals.

[0017] Furthermore, the inner wall of the fixing sleeve has a limiting surface, one end of the first silencer block is limitedly matched with the limiting surface, and the end of the fixing sleeve away from the first silencer block is fixedly connected to the second silencer block; or, the first silencer block and the second silencer block are respectively fixedly connected to the fixing sleeve.

[0018] Furthermore, an end of the fixing sleeve away from the first silencer block has a flange structure, and the flange structure and an end of the second silencer block away from the first silencer block are riveted together.

[0019] According to another aspect of the present application, an electronic expansion valve is provided. The electronic expansion valve includes the aforementioned silencer assembly, a valve body, a guide sleeve, a valve needle assembly, and a nut structure. The guide sleeve is mounted within the valve body, the valve needle assembly and the nut structure are threadedly engaged, and at least a portion of the valve needle assembly is positioned within the guide sleeve for guidance by the guide sleeve. By providing the aforementioned silencer assembly within the electronic expansion valve, bubbles in the fluid before and after throttling through the electronic expansion valve can be more uniform, reducing noise during fluid flow and improving the performance of the electronic expansion valve.

[0020] Furthermore, the electronic expansion valve has a connecting pipeline, a valve body has a first valve port, a connecting hole is provided on the valve body, the connecting hole is connected to the connecting pipeline, and the silencer assembly is provided at the connection between the connecting hole and the connecting pipeline, or in the valve body, or in the connecting pipeline. This arrangement facilitates assembly and disassembly of the silencer assembly.

[0021] Furthermore, the valve needle assembly is disposed corresponding to the first valve port, and the first valve port has a straight section and a tapered section that are interconnected. The straight section is disposed away from the valve needle assembly, and the tapered section has a first port and a second port disposed opposite each other. The first port is disposed toward the valve needle assembly, and the diameter of the tapered section gradually decreases from the first port toward the second port. The end of the valve needle assembly facing the first valve port forms a sealing end. The diameter of the first port is greater than the diameter of the sealing end, and the diameter of the second port is less than or equal to the diameter of the sealing end. The valve needle assembly is capable of moving relative to the first valve port to adjust the flow rate at the first valve port. With this arrangement, when the valve needle assembly moves within the first valve port, the distance between the sealing end and the inner wall of the first valve port can be adjusted. In this way, the sealing end of the valve needle assembly can cooperate with the first valve port to adjust the flow rate through the first valve port.

[0022] Furthermore, the projections of the decomposition area of ​​the first and second muffler blocks of the muffler assembly in the flow direction cover the cross-section of the flow channel of the connecting pipe. This arrangement can increase the area of ​​the decomposition area, thereby improving the noise reduction effect of the muffler assembly.

[0023] Furthermore, the total flow area of ​​the silencer area and the flow area is greater than or equal to 50% of the flow area of ​​the first valve port. Through the above arrangement, the influence of the silencer component on the fluid flow can be reduced, and the fluid flow efficiency can be improved.

[0024] Furthermore, the first muffler block of the muffler assembly is disposed proximate to the first valve port, with a gap between the first valve port and the first muffler block. The distance between the port of the first valve port proximate to the first muffler block and the first muffler block is L1, where L1 is ≥ 1 mm. This arrangement can reduce the impact of the muffler assembly on fluid circulation.

[0025] Furthermore, the flow area of ​​the first valve port is S1, the projected area of ​​the second silencer block of the silencer assembly along the flow direction is S4, and S4 / S1>2. Through the above arrangement, the smoothness of fluid flow can be improved.

[0026] Furthermore, the first muffler block of the muffler assembly has a first through hole, the flow area of ​​the first through hole is S5, the diameter of the first through hole is R1, the distance between the first muffler block and the second muffler block is L2, and π*R1*L2≥1.2*S5. This arrangement can improve the flow efficiency of the fluid.

[0027] Furthermore, the flow area of ​​the first valve port is S1, and the first muffler block of the muffler assembly has a first through hole, the flow area of ​​the first through hole is S5, and S5>0.4*S1. Through the above arrangement, the flow velocity of the fluid when flowing through the muffler assembly can be increased, thereby improving the flow efficiency of the fluid.

[0028] Furthermore, the connecting hole has a first hole section, a second hole section and a third hole section arranged in a stepped manner. The first hole section, the second hole section and the third hole section are connected in sequence. The inner diameter of the first hole section is smaller than the inner diameter of the second hole section. A first step surface is formed between the first hole section and the second hole section. The inner diameter of the second hole section is smaller than the inner diameter of the third hole section. A second step surface is formed between the second hole section and the third hole section. The first silencer block of the silencer assembly is arranged in the second hole section. A support ring is arranged between the first silencer block and the second silencer block of the silencer assembly. The support ring is arranged in the third hole section. One end of the first silencer block abuts against the first step surface. The other end of the first silencer block is arranged toward the support ring. The end of the support ring close to the first silencer block abuts against the second step surface. The second silencer block is arranged in the third hole section. One end of the second silencer block abuts against the support ring. The connecting pipe is inserted in the third hole section. The end of the second silencer block away from the support ring abuts against the end face of the connecting pipe. Through the above arrangement, the stability of the assembly of the silencer assembly in the communicating hole can be improved, and the installation of the silencer assembly and the electronic expansion valve can be facilitated.

[0029] Furthermore, the diameter of the first muffler block is R2, the width of the first step surface is L3, and L3≥0.03*R2. Through the above configuration, the limiting effect of the first step surface can be ensured, and the stability of the first muffler block fixed in the connecting hole can be improved.

[0030] Furthermore, the diameter of the second muffler block is R3, the circumferential thickness of the support ring is L4, and L4≥0.02*R3. Through the above arrangement, the limiting effect of the second step surface can be ensured, and the stability of the second muffler block fixed in the connecting hole can be improved.

[0031] Alternatively, the guide sleeve has a first valve port, the valve needle assembly includes a first valve needle structure and a second valve needle structure, the first valve needle structure is used to open and close the first valve port, the first valve needle structure has a second valve port, and the second valve needle structure is used to open and close the second valve port; the silencer assembly is installed on the side of the second valve port facing away from the second valve needle structure.

[0032] Furthermore, the first valve needle structure includes a valve needle body, a sealing gasket and a limiter. The valve needle body is used to open and close the first valve port. The sealing gasket and the limiter are both arranged in the cavity of the valve needle body. The sealing gasket has a second valve port. The limiter is fixedly connected to the valve needle body and limits the sealing gasket. The silencer assembly is fixedly connected to the valve needle body or the limiter.

[0033] Furthermore, the silencer assembly also includes a fixed sleeve, both ends of which have openings for fluid to pass through, the first silencer block and the second silencer block are arranged at intervals in the cavity of the fixed sleeve, and one end of the fixed sleeve and the limit member are interference fit or welded or riveted.

[0034] Furthermore, a support ring is provided between the first silencer block and the second silencer block.

[0035] Furthermore, the limiting member is annular and is arranged around the second valve port. The inner wall of the limiting member has an inner annular step, and the outer wall of the fixing sleeve has an outer annular step. The outer annular step and the inner annular step are limited and matched. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0037] FIG1 is a schematic structural diagram showing the cooperation between a muffler assembly and a valve body provided in a first embodiment of the present application;

[0038] FIG2 shows a schematic structural diagram of a noise reduction assembly provided in the first embodiment of the present application;

[0039] FIG3 shows a partial enlarged view of point A in FIG1 ;

[0040] FIG4 shows a top view of the first muffler block provided in the first embodiment of the present application;

[0041] FIG5 shows a top view of the support ring provided in the first embodiment of the present application;

[0042] FIG6 shows a top view of the second muffler block provided in the first embodiment of the present application;

[0043] FIG7 shows a schematic structural diagram of a second muffler block provided in a second embodiment of the present application;

[0044] FIG8 shows a schematic structural diagram of an electronic expansion valve provided by the present application;

[0045] FIG9 shows a partial enlarged view of point B in FIG8 ;

[0046] FIG10 shows a schematic structural diagram of an electronic expansion valve provided in one embodiment of the present application;

[0047] FIG11 shows a partial enlarged view of point C in FIG10 ;

[0048] FIG12 shows a schematic diagram of the application of the electronic expansion valve provided in the present application in an air-conditioning system.

[0049] The above drawings include the following reference numerals: 10, first silencer block; 11, first through hole; 20, second silencer block; 21, second through hole; 30, support ring; 40, valve body; 41, first valve port; 411, straight segment; 412, tapered segment; 4121, first port; 4122, second port; 42, communicating hole; 421, first hole section; 422, second hole section; 423, third hole section; 424, first step surface; 425, second step surface; 43, flow port; 50, connecting pipeline; 60, valve needle assembly; 61, first valve needle structure; 611, second valve port; 612, valve needle body; 613, sealing gasket; 614, limiter; 615, inner annular step; 62, second valve needle structure; 70. Fixed sleeve; 71. Limiting surface; 72. Flanged structure; 73. Outer annular step; 80. Guide sleeve; 100. Fluid circulation circuit; 200. Control valve; 300. First heat exchanger; 400. Second heat exchanger. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] As shown in Figures 1 to 3, an embodiment of the present application provides a silencer assembly, which includes a silencer structure. The silencer structure has a circulation area and a decomposition area. Bubbles in the fluid flowing through the silencer assembly can be decomposed through the decomposition area. The silencer structure includes: a first silencer block 10 and a second silencer block 20. The first silencer block 10 and the second silencer block 20 are arranged at intervals along the circulation direction of the fluid. The first silencer block 10 and the second silencer block 20 are both provided with a circulation area and a decomposition area, wherein the circulation area at least partially provided on the first silencer block 10 is corresponding to the decomposition area provided on the second silencer block 20, and the circulation area at least partially provided on the second silencer block 20 is corresponding to the decomposition area provided on the first silencer block 10.

[0052] Applying the technical solution provided by the present application, the first muffler block 10 and the second muffler block 20 of the muffler structure are both provided with a circulation area and a decomposition area. Larger bubbles in the two-phase fluid flowing through the decomposition area will be decomposed into smaller bubbles in the decomposition area, so that the bubble size in the fluid becomes uniform, thereby reducing the abnormal noise generated by unstable, discontinuous large bubbles during flow. When impurities in the fluid cannot pass through the decomposition area, it is easy to cause the decomposition area to be blocked. By providing the circulation area, the impurities can flow through the circulation area through the muffler assembly, preventing the muffler assembly from being blocked. At least part of the circulation area provided on the first muffler block 10 is provided corresponding to the decomposition area provided on the second muffler block 20, and at least part of the circulation area provided on the second muffler block 20 is provided corresponding to the decomposition area provided on the first muffler block 10, so that the projection of at least part of the circulation area of ​​the first muffler block 10 on the second muffler block 20 coincides with the decomposition area of ​​the second muffler block 20, and at least part of the projection of the circulation area of ​​the second muffler block 20 on the first muffler block 10 coincides with the decomposition area of ​​the first muffler block 10. This allows bubbles in the fluid mixed with impurities to flow through the circulation area of ​​the first or second muffler block 10, 20, and then flow through the decomposition area of ​​the first or second muffler block 10, 20 for decomposition. Compared to traditional technical solutions that require a separate fixed structure to fix the muffler structure and allow impurities to flow through the fixed structure, this technical solution increases the area within the muffler assembly for bubble decomposition, improves the decomposition effect of the muffler assembly, and thus enhances the noise reduction capability of the muffler assembly.

[0053] In one embodiment, the first silencer block 10 and the second silencer block 20 are filter mesh sintered blocks, which are woven from metal wires or alloy wires. The metal wires or alloy wires are then sintered to each other through high-temperature heating to form a uniform block filter material with high strength and stability, and can effectively achieve a filtering effect.

[0054] In one embodiment, the first muffler block 10 and the second muffler block 20 can be stainless steel filter mesh sintered blocks. Stainless steel has low cost, adopts sintering process, is reliable after molding, and has good compatibility with fluids.

[0055] The first muffler block 10 has a first through-hole 11, and the second muffler block 20 has a plurality of second through-holes 21. The first through-hole 11 forms a flow area on the first muffler block 10, and the plurality of second through-holes 21 form a flow area on the second muffler block 20. By providing the first through-hole 11 on the first muffler block 10 and the plurality of second through-holes 21 on the second muffler block 20, larger diameter holes can be formed in the filter sintered block, preventing impurities in the fluid from passing through the first and second muffler blocks 10, 20, thereby preventing the first and second muffler blocks 10, 20 from becoming clogged.

[0056] As shown in Figures 3 to 6, in one embodiment, the first muffler block 10 and the second muffler block 20 are coaxially arranged. The axis of the first through-hole 11 coincides with the axis of the first muffler block 10, and a plurality of second through-holes 21 are annularly spaced around the axis of the second muffler block 20. This arrangement prevents fluid from directly passing through the first through-hole 11 and the plurality of second through-holes 21. Fluid flowing through the first through-hole 11 can pass through the second muffler block 20 except for the plurality of second through-holes 21, while fluid flowing through the plurality of second through-holes 21 can pass through the first muffler block 10 except for the first through-hole 11. This allows more fluid to be filtered through the decomposition area, thereby improving the noise reduction effect of the muffler assembly. The plurality of second through-holes 21 are annularly spaced around the axis of the second muffler block 20, ensuring that the fluid exerts a more uniform force on the second muffler block 20 when passing through it, thereby improving the stability of the muffler structure.

[0057] In some embodiments, along the flow direction of the fluid, the projection of the first through hole 11 does not overlap with the projections of the plurality of second through holes 21. Through the above arrangement, as much fluid as possible can pass through the decomposition area, thereby improving the silencing effect of the silencing assembly.

[0058] As shown in Figure 7, in one embodiment, a plurality of second through holes 21 arranged in a ring-shaped manner around the axis of the second silencer block 20 form a through hole group. The second silencer block 20 has a plurality of through hole groups, and the plurality of through hole groups form a concentric circle structure, that is, the plurality of through hole groups are distributed layer by layer along the radial direction of the second silencer block 20. In this way, the number of second through holes 21 can be increased, so that the force of fluid impact on the second silencer block 20 in all directions is more balanced.

[0059] In some embodiments, the first through hole 11 and each second through hole 21 may be configured to be in a circular shape, a regular polygonal shape, or the like.

[0060] In some embodiments, the pore size of the first and second muffler blocks 10, 20 is 0.12-0.35 mm. When the pore size of the first and second muffler blocks 10, 20 is less than 0.12 mm, the pore size of the first and second muffler blocks 10, 20 is too small, and the spacing between the holes in the first and second muffler blocks 10, 20 is too small. As a result, the first and second muffler blocks 10, 20 will create greater resistance to the circulation of the fluid, affecting the flow of the fluid. When the pore size of the first silencer block 10 and the second silencer block 20 is greater than 0.35mm, the pore size of the first silencer block 10 and the second silencer block 20 is too large, the spacing between the holes on the first silencer block 10 and the second silencer block 20 is too large, and the effect of decomposing large bubbles is poor. In this application, by setting the pore size of the first silencer block 10 and the second silencer block 20 to 0.12-0.35mm, it is possible to reduce the impact of the first silencer block 10 and the second silencer block 20 on the fluid flow without affecting the decomposition effect of the first silencer block 10 and the second silencer block 20, prevent the first silencer block 10 and the second silencer block 20 from causing excessive throttling of the passing fluid, and prevent affecting the circulation efficiency of the fluid in the air-conditioning system. Among them, the pore size of the first silencer block 10 and the second silencer block 20 can be set to 0.12mm, 0.25mm, 0.28mm or 0.35mm.

[0061] In one embodiment, the first and second muffler blocks 10 and 20 are sintered filter blocks with densely populated internal pores and at least three layers. Compared to single-layer or double-layered rectifiers, these blocks achieve a more refined and effective flow straightening effect, capable of vaporizing discontinuous large bubbles (plug flow). The muffler blocks cover the entire flow channel cross-section, achieving complete refinement and uniformity of the bubbles (fine bubble flow).

[0062] In some embodiments, the porosity of the first and second muffler blocks 10, 20 is 45%-95%. Porosity refers to the ratio of the volume of pores in a material to the total volume. When the porosity of the first and second muffler blocks 10, 20 is less than 45%, the ratio of the volume of pores in the first and second muffler blocks 10, 20 to the total volume is too small, the muffler assembly has a poor efficiency in decomposing bubbles, and the flow resistance of the fluid is increased, affecting the circulation of the fluid. When the porosity of the first and second muffler blocks 10, 20 is greater than 95%, the ratio of the volume of pores in the first and second muffler blocks 10, 20 to the total volume is too large, and the first and second muffler blocks 10, 20 have a poor effect on refining bubbles. In this application, by setting the porosity of the first and second muffler blocks 10, 20 to 45%-95%, the noise reduction effect of the muffler structure can be improved while ensuring the smoothness of fluid circulation. The porosity of the first muffler block 10 and the second muffler block 20 can be set to 45%, 50%, 80% or 95%.

[0063] In some embodiments, the muffler assembly further includes a support structure disposed between the first muffler block 10 and the second muffler block 20. The support structure forms a gap between the first muffler block 10 and the second muffler block 20. This arrangement allows a passage for impurities to flow between the first through-hole 11 and the second through-hole 21, allowing impurities to flow through the first muffler block 10 and the second muffler block 20 without being blocked by the first muffler block 10 and the second muffler block 20, thereby improving the performance of the muffler assembly.

[0064] Furthermore, a support ring 30 is provided between the first muffler block 10 and the second muffler block 20, and the support ring 30 is provided on the periphery of the second muffler block 20. By providing the support ring 30, the relative displacement of the first muffler block 10 and the second muffler block 20 can be limited by the support ring 30, preventing the first muffler block 10 or the second muffler block 20 from being displaced under the impact of the fluid, thereby ensuring the stability of the first muffler block 10 and the second muffler block 20.

[0065] In some embodiments, the support ring 30 needs to be arranged to avoid the first through hole 11 and the second through hole 21 to prevent the support ring 30 from blocking impurities from flowing in the silencer assembly.

[0066] In one embodiment, the support ring 30 has a circulation channel, the area of ​​the circulation channel is S2, the maximum projected area of ​​the silencer structure along the circulation direction is S3, and S2 ≥ 0.8 * S3. When the area of ​​the circulation channel S2 is less than 0.8 * S3, the circulation area of ​​the circulation channel of the support ring 30 is small, and the fluid will encounter greater flow resistance when passing through the support ring 30, affecting the circulation of the fluid and reducing the flow rate of the fluid when passing through the first silencer block 10 and the second silencer block 20 support ring 30. By setting S2 ≥ 0.8 * S3, the flow resistance encountered by the fluid when flowing through the support ring 30 can be reduced while ensuring the support effect of the support ring 30 on the first silencer block 10, thereby ensuring the smoothness of the fluid circulation. Among them, S2 can be set to 0.8 * S3, 0.85 * S3 or 0.9 * S3.

[0067] In some embodiments, as shown in Figures 10 and 11, the silencer assembly further includes a fixing sleeve 70 having openings at both ends for fluid passage. The first silencer block 10 and the second silencer block 20 are spaced apart within the cavity of the fixing sleeve 70. The installation of the fixing sleeve 70 enables the installation of the first silencer block 10 and the second silencer block 20, defining their relative positions. Furthermore, the installation of the fixing sleeve 70 makes the silencer assembly a modular structure, facilitating its installation in locations where fluid silencing is required.

[0068] Furthermore, a support ring 30 is provided between the first silencer block 10 and the second silencer block 20 . The support ring 30 is also provided in the fixing sleeve 70 . The first silencer block 10 and the second silencer block 20 are separated by the support ring 30 .

[0069] In one embodiment, the inner wall of the fixing sleeve 70 has a limiting surface 71, and one end of the first muffler block 10 is limitedly engaged with the limiting surface 71, so that the end of the fixing sleeve 70 away from the first muffler block 10 is fixedly connected to the second muffler block 20; or, the first muffler block 10 and the second muffler block 20 are respectively fixedly connected to the fixing sleeve 70. In both cases, the first muffler block 10 and the second muffler block 20 can be fixedly connected.

[0070] In Figure 11, the end of the fixing sleeve 70 away from the first muffler block 10 has a flange structure 72, and the flange structure 72 is riveted to the end of the second muffler block 20 away from the first muffler block 10. In this way, the first muffler block 10 is axially limited by the limiting surface 71, and the second muffler block 20 is axially limited by the flange structure 72.

[0071] Furthermore, the first silencer block 10, the support ring 30 and the second silencer block 20 are abutted in sequence. In this way, combined with the limiting function of the fixing sleeve 70, the first silencer block 10 and the second silencer block 20 can be limited in two axial directions.

[0072] In some embodiments, the first muffler block 10 and the second muffler block 20 are respectively welded to the fixing sleeve 70. Alternatively, the first muffler block 10 and the second muffler block 20 are fixedly connected to the fixing sleeve 70 by interference fit.

[0073] 8 and 9 , an embodiment of the present application provides an electronic expansion valve, which includes the above-mentioned silencer assembly. By providing the above-mentioned silencer assembly in the electronic expansion valve, the bubbles in the fluid before and after throttling through the electronic expansion valve can be made more uniform, the noise during fluid flow can be reduced, and the performance of the electronic expansion valve can be improved. The electronic expansion valve also includes a valve body 40, a guide sleeve 80, a valve needle assembly 60, and a nut structure. The guide sleeve 80 is installed in the valve body 40, the valve needle assembly 60 and the nut structure are threadedly matched, and at least a portion of the valve needle assembly 60 is located in the guide sleeve 80 to be guided by the guide sleeve 80. By providing a separate guide sleeve 80 to guide the valve needle assembly 60, the valve needle assembly 60 can move smoothly and will not shake due to the radial impact of the fluid on the valve needle assembly 60, thereby improving the structural stability and reliability of the electronic expansion valve.

[0074] In one embodiment, the electronic expansion valve has a connecting pipeline 50 , the valve body 40 has a first valve port 41 , and the valve body 40 is provided with a communicating hole 42 , which is connected to the connecting pipeline 50 .

[0075] In one embodiment, the silencer assembly is arranged at the connection between the connecting hole 42 and the connecting pipe 50, so that the replacement of the silencer assembly can be facilitated. When the silencer structure of the silencer assembly becomes dirty and clogged, the valve body 40 can be removed from the connecting pipe 50 to achieve replacement of the silencer assembly. There is no need to disassemble the valve body 40 for replacement, thereby improving the convenience of maintenance.

[0076] In one embodiment, the silencer assembly is disposed within the valve body 40 , which facilitates installation of the silencer assembly. When installing the electronic expansion valve, there is no need to add an additional installation step for the silencer assembly, thereby improving installation efficiency.

[0077] In one embodiment, the silencer assembly is disposed in the connecting pipe 50. With this arrangement, the fluid in the connecting pipe 50 can decompose larger bubbles through the silencer assembly, thereby improving the noise reduction effect of the silencer assembly.

[0078] In one embodiment, a plurality of communication holes 42 are provided on the valve body 40, and the silencer assembly can be provided separately at one or more of the communication holes 42, or can be provided at all of the communication holes 42, to further reduce the noise of the fluid when flowing through the electronic expansion valve.

[0079] Furthermore, in the present application, the first silencer block 10 may be arranged toward the first valve port 41 , and the second silencer block 20 may also be arranged toward the first valve port 41 .

[0080] In some embodiments, the projections of the decomposition areas of the first muffler block 10 and the second muffler block 20 of the muffler assembly in the flow direction collectively cover the cross-section of the flow channel of the connecting pipe 50. This arrangement allows larger bubbles in the fluid within the connecting pipe 50 to be decomposed by the decomposition areas of the first muffler block 10 or the second muffler block 20 as it flows through the muffler assembly, preventing some large bubbles from flowing through the decomposition areas and thereby enhancing the noise reduction effect of the muffler assembly.

[0081] In some embodiments, the total flow area of ​​the decomposition region and the flow area is greater than or equal to 50% of the flow area of ​​the first valve port 41. When the total flow area of ​​the silencing region and the flow area is less than 50% of the flow area of ​​the first valve port 41, the fluid flowing through the first valve port 41 to the silencing assembly will produce a large pressure drop, affecting the flow efficiency of the fluid. In the present application, by setting the total flow area of ​​the decomposition region and the flow area to be greater than or equal to 50% of the flow area of ​​the first valve port 41, the impact of the silencing assembly on fluid flow can be reduced, thereby improving the flow efficiency of the fluid.

[0082] In some embodiments, the first muffler block 10 of the muffler assembly is arranged near the first valve port 41, and there is a gap between the first valve port 41 and the first muffler block 10. The distance between the port of the first valve port 41 near the first muffler block 10 and the first muffler block 10 is L1, and L1 ≥ 1mm. When the distance between the port of the first valve port 41 near the first muffler block 10 and the first muffler block 10 is less than 1mm, the distance between the port of the first valve port 41 near the first muffler block 10 and the first muffler block 10 is too small, which is not conducive to the flow of fluid in the first valve port 41 and the muffler assembly, and the fluid will be subject to a large flow resistance. In this application, by setting L1 ≥ 1mm, the influence of the muffler assembly on the fluid flow can be reduced. Among them, L1 can be set to 1mm, 1.5mm, 2mm or 3mm.

[0083] In some embodiments, the flow area of ​​the first valve port 41 is S1, and the projected area of ​​the second silencer block 20 of the silencer assembly along the flow direction is S4, where S4 / S1>2. When the ratio of S4 to S1 is less than or equal to 2, the projected area of ​​the second silencer block 20 along the flow direction is too small, and the fluid will be subject to a large flow resistance. In the present application, by setting the ratio of S4 to S1 to be greater than 2, the smoothness of the fluid flow can be improved. Among them, the ratio of S4 to S1 can be set to 2.5, 2.7, or 3.

[0084] In some embodiments, the first muffler block 10 of the muffler assembly has a first through hole 11, the flow area of ​​the first through hole 11 is S5, the diameter of the first through hole 11 is R1, the distance between the first muffler block 10 and the second muffler block 20 is L2, π*R1*L2≥1.2*S5, π*R1*L2 is the flow area of ​​the first through hole 11 between the first muffler block 10 and the second muffler block 20, when the flow area of ​​the first through hole 11 between the first muffler block 10 and the second muffler block 20 is less than 1.2 times the flow area of ​​the first through hole 11, the fluid will encounter a greater flow resistance when flowing through the muffler assembly. In the present application, by setting π*R1*L2≥1.2*S5, the flow efficiency of the fluid can be improved. The ratio of the flow area of ​​the first through hole 11 between the first muffler block 10 and the second muffler block 20 to the flow area of ​​the first through hole 11 can be set to 1.2, 1.3 or 1.5.

[0085] In some embodiments, the flow area of ​​the first valve port 41 is S1, and the first muffler block 10 of the muffler assembly has a first through hole 11. The flow area of ​​the first through hole 11 is S5, and S5>0.4*S1. When S5≤0.4*S1, the flow area of ​​the first through hole 11 is too small, which will over-throttle the fluid, causing the fluid to flow slowly at the electronic expansion valve. In this application, by setting S5>0.4*S1, the flow velocity of the fluid when flowing through the muffler assembly can be increased, thereby improving the flow efficiency of the fluid. Among them, the ratio of the flow area of ​​the first through hole 11 to the flow area of ​​the first valve port 41 can be set to 0.45 times, 0.5 times, or 0.6 times.

[0086] In some embodiments, the communicating hole 42 has a first hole section 421, a second hole section 422, and a third hole section 423 arranged in a stepped manner. The first hole section 421, the second hole section 422, and the third hole section 423 are connected in sequence. The inner diameter of the first hole section 421 is smaller than the inner diameter of the second hole section 422. A first stepped surface 424 is formed between the first hole section 421 and the second hole section 422. The inner diameter of the second hole section 422 is smaller than the inner diameter of the third hole section 423. A second stepped surface 425 is formed between the second hole section 422 and the third hole section 423. The first silencer block 10 of the silencer assembly is arranged in the second hole section 422. The first silencer block 10 is arranged in the second hole section 422. A support ring 30 is provided between the block 10 and the second silencer block 20 of the silencer assembly. The support ring 30 is provided in the third hole section 423. One end of the first silencer block 10 abuts against the first step surface 424. The other end of the first silencer block 10 is provided toward the support ring 30. The end of the support ring 30 close to the first silencer block 10 abuts against the second step surface 425. The second silencer block 20 is provided in the third hole section 423. One end of the second silencer block 20 abuts against the support ring 30. The connecting pipe 50 is inserted into the third hole section 423. The end of the second silencer block 20 away from the support ring 30 abuts against the end face of the connecting pipe 50. Through the above arrangement, the communicating hole 42 and the connecting pipe 50 can achieve the limitation of the silencer assembly through the first hole section 421, the second hole section 422 and the third hole section 423 to prevent the silencer assembly from falling off when impacted by fluid.

[0087] In one embodiment, the first silencer block 10 and the second hole section 422 are interference fit, and the support ring 30 and the second silencer block 20 and the inner wall of the third hole section 423 are interference fit, which can further improve the stability of the silencer assembly in the connecting hole 42. At the same time, this installation method is more convenient and does not require welding and other steps, which facilitates the installation of the silencer assembly and the electronic expansion valve.

[0088] In one embodiment, the diameter of the first muffler block 10 is R2, and the width of the first stepped surface 424 is L3, where L3 ≥ 0.03*R2. When L3 < 0.03*R2, the width of the first stepped surface 424 is too small, resulting in a poor position-limiting effect on the first muffler block 10. The outer periphery of the first muffler block 10 is easily deformed and may fall out of the second hole section 422. In this application, by setting L3 ≥ 0.03*R2, the position-limiting effect of the first stepped surface 424 can be ensured. The ratio of the width of the first stepped surface 424 to the diameter of the first muffler block 10 can be set to 0.03, 0.04, or 0.05.

[0089] In one embodiment, the diameter of the second muffler block 20 is R3, and the circumferential thickness of the support ring 30 is L4, where L4 ≥ 0.02*R3. When L4 < 0.02*R3, the width of the support ring 30 is too small, and the support ring 30 has a poor retaining effect on the second muffler block 20. The outer edge of the second muffler block 20 is easily deformed and falls out of the third hole section 423, resulting in a decrease in the spacing between the first muffler block 10 and the second muffler block 20. In this application, by setting L4 ≥ 0.02*R3, the stability of the second muffler block 20 within the third hole section 423 can be ensured. The ratio of the circumferential thickness of the support ring 30 to the diameter of the second muffler block 20 can be set to 0.02, 0.03, 0.04, or 0.05.

[0090] In some embodiments, the valve needle assembly 60 is disposed corresponding to the first valve port 41. The first valve port 41 has a straight section 411 and a tapered section 412 that are interconnected. The straight section 411 is disposed away from the valve needle assembly 60, and the tapered section 412 has a first port 4121 and a second port 4122 that are disposed opposite each other. The first port 4121 is disposed toward the valve needle assembly 60, and the diameter of the tapered section 412 gradually decreases from the first port 4121 toward the second port 4122. The end of the valve needle assembly 60 that faces the first valve port 41 forms a sealed end. The diameter of the first port 4121 is larger than the diameter of the sealed end, and the diameter of the second port 4122 is smaller than or equal to the diameter of the sealed end. The valve needle assembly 60 is movable relative to the first valve port 41 to adjust the flow rate at the first valve port 41. With this configuration, the electronic expansion valve can adjust the distance that the end of the valve needle assembly 60 enters the first valve port 41 to adjust the flow rate at the first valve port 41.

[0091] In one embodiment, the sealing end of the valve needle assembly 60 can enter the first port 4121 and move toward the second port 4122. Since the diameter of the tapered section 412 gradually decreases from the first port 4121 to the second port 4122, the distance between the outer diameter of the sealing end and the inner diameter of the tapered section 412 will change with the movement of the valve needle assembly 60 in the tapered section 412, thereby enabling the regulation of the fluid flow.

[0092] As shown in Figures 10 and 11, in one embodiment, the guide sleeve 80 has a first valve port 41, the valve needle assembly 60 includes a first valve needle structure 61 and a second valve needle structure 62, the first valve needle structure 61 is used to open and close the first valve port 41, the first valve needle structure 61 has a second valve port 611, and the second valve needle structure 62 is used to open and close the second valve port 611; the silencer assembly is installed on the side of the second valve port 611 facing away from the second valve needle structure 62.

[0093] In one embodiment, the flow area of ​​the second valve port 611 is smaller than that of the first valve port 41. The sidewall of the valve body 40 has a flow port 43, and one end of the valve body 40 has a connecting hole 42. When the first valve port 41 is open, the connecting hole 42 communicates with the flow port 43 through the first valve port 41. When the second valve port 611 is open, the connecting hole 42 communicates with the flow port 43 through the second valve port 611. A silencer assembly is mounted on the end of the first valve needle structure 61 that faces the connecting hole 42, and the silencer assembly corresponds to the second valve port 611.

[0094] The silencer assembly is installed at one end of the first valve needle structure 61 facing the connecting hole 42 and corresponding to the second valve port 611, so that the fluid passing through the second valve port 611 needs to pass through the silencer assembly, thereby decomposing the larger bubbles in the fluid flowing here into smaller bubbles or directly making the bubbles disappear through the silencer assembly, thereby reducing the noise generated by the rupture of large bubbles.

[0095] In this electronic expansion valve, depending on usage requirements, the first valve port 41 can be switched to open or the second valve port 611 can be switched to open, thereby enabling different operating states. When the first valve port 41 is open, fluid passes through the first valve port 41. The first valve port 41 has a larger flow area than the second valve port 611, enabling high-flow fluid flow. When the first valve port 41 is closed and the second valve port 611 is open, fluid passes through the second valve port 611. Due to the smaller flow area of ​​the second valve port 611, low-flow fluid flow can be achieved. Furthermore, the opening of the second valve port 611 can be adjusted by moving the position of the second valve needle structure 62, thereby achieving precise flow regulation.

[0096] The electronic expansion valve can be used in air conditioning systems. In this case, the first valve port 41 is closed and the second valve port 611 is open, allowing fluid to pass through the second valve port 611. Because the gas-liquid mixed fluid contains bubbles, the first and second muffler blocks 10 and 20 break down large bubbles into small bubbles or directly eliminate them when passing through the silencer assembly, thereby reducing the noise generated when large bubbles burst.

[0097] Among them, the first valve needle structure 61 includes a valve needle body 612, a sealing gasket 613 and a limiter 614. The valve needle body 612 is used to open and close the first valve port 41. The sealing gasket 613 and the limiter 614 are both arranged in the cavity of the valve needle body 612. The sealing gasket 613 has a second valve port 611. The limiter 614 is fixedly connected to the valve needle body 612 and limits the sealing gasket 613. The silencer assembly is fixedly connected to the valve needle body 612 or the limiter 614.

[0098] A support ring 30 is provided between the first muffler block 10 and the second muffler block 20 , and the support ring 30 is used to space and limit the first muffler block 10 and the second muffler block 20 .

[0099] The sealing gasket 613 is made of a non-metallic material, which can improve the sealing effect when closing the second valve port 611. The sealing gasket 613 is fixed by the stopper 614. The silencer assembly can be connected to the valve needle body 612 or the stopper 614 as needed.

[0100] As shown in Figure 11, the silencer assembly also includes a fixed sleeve 70, both ends of which have openings for fluid to pass through, the first silencer block 10 and the second silencer block 20 are arranged at intervals in the cavity of the fixed sleeve 70, and one end of the fixed sleeve 70 and the limit member 614 are interference fit or welded or riveted.

[0101] The fixing sleeve 70 is provided to secure the first and second muffler blocks 10 and 20 and to define the relative positions of the first and second muffler blocks 10 and 20. Furthermore, the connection between the fixing sleeve 70 and the stopper 614 secures the muffler assembly.

[0102] In one embodiment, the stopper 614 is annular and disposed around the second valve port 611. The inner wall of the stopper 614 has an inner annular step 615, and the outer wall of the fixing sleeve 70 has an outer annular step 73. The outer annular step 73 and the inner annular step 615 cooperate to limit the position of the fixing sleeve 70. The cooperation between the outer annular step 73 and the inner annular step 615 limits the radial and axial position of the fixing sleeve 70, precisely defining the position of the silencer assembly.

[0103] As shown in FIG12 , in an air-conditioning system with a dehumidification function, the air-conditioning system includes a fluid circulation circuit 100 and a control valve 200. The control valve 200 is arranged on the fluid circulation circuit 100 and is arranged between the first heat exchanger 300 and the second heat exchanger 400. The air-conditioning system has a cooling and heating mode and a non-cooling and dehumidifying mode. When the air-conditioning system is in the cooling and heating mode, the control valve 200 is fully opened and the refrigerant fluid is not throttled. The first heat exchanger 300 and the second heat exchanger 400 can be regarded as a whole heat exchanger to release or absorb heat; when the air-conditioning system is in the non-cooling and dehumidifying mode, the first heat exchanger 300 is a condenser, and the refrigerant fluid passes through the first heat exchanger 300. The heat exchanger 300 releases heat, and the refrigerant fluid flows out of the first heat exchanger 300 and enters the control valve 200. The control valve 200 can control the flow of the refrigerant fluid, so that the refrigerant fluid passes through the control valve 200 at a smaller flow rate for throttling and pressure reduction. At this time, the second heat exchanger 400 absorbs heat as an evaporator, and the fan drives the indoor humid air to pass through the second heat exchanger 400 that absorbs heat, so that the water vapor condenses, which has a dehumidification effect. At the same time, the first heat exchanger 300 in the room acts as a condenser to increase the indoor air temperature, that is, the air passes through the second heat exchanger 400 for condensation and dehumidification, and passes through the first heat exchanger 300 for heating, and circulates under the action of the fan, thereby achieving the effect of dehumidification without cooling.

[0104] In the traditional technical solution, the control valve 200 is usually set as a dehumidification solenoid valve. The dehumidification solenoid valve has a valve needle and a valve port. The valve needle can open or block the valve port to control the on and off of the refrigerant fluid flowing through the valve port. In order to achieve a small flow circulation mode, the solenoid valve will be provided with a valve plate with a throttling hole on the valve core to enable the solenoid valve to flow a small flow of refrigerant fluid when the solenoid valve is in the fully closed mode. However, this setting method will cause the flow rate of the refrigerant fluid to be fixed at a certain value and cannot be adjusted. It is impossible to accurately control the matching value of the dehumidification amount and the heating amount. It will cause the indoor temperature to change during dehumidification, and the effect of dehumidification without cooling is poor. In addition, because the throttling hole is usually formed by stamping, it is easy to cause the throttling effect to be unstable, resulting in fluctuations in superheat, affecting the energy efficiency of the air conditioning dehumidification operation. There will also be obvious mechanical noise during the opening and closing process of the solenoid valve, affecting the user experience.

[0105] The electronic expansion valve provided in the present application can be used as a dehumidification electronic expansion valve and arranged in the air-conditioning pipeline. When the air-conditioning is in normal cooling and heating mode, the valve needle assembly 60 is arranged away from the first valve port 41, and the electronic expansion valve is in a fully open state. When the air-conditioning system is in dehumidification mode, the electronic expansion valve switches to a throttling state with a small flow rate, and part of the valve needle assembly 60 enters the first valve port 41. There is a certain gap between the inner wall of the first valve port 41 and the sealing end. The fluid can flow in the gap at a smaller flow rate to realize the throttling effect of the electronic expansion valve and realize the dehumidification function.

[0106] In one embodiment, the thickness of the first muffler block 10 is L5, the diameter of the first through hole 11 is R1, the flow area of ​​the first valve port 41 is S1, L5*R1 ≥ 0.75S1, L5*R1 is the side projection area of ​​the first through hole 11, when the side projection area of ​​the first through hole 11 is less than 0.75 times the flow area of ​​the first valve port 41, the flow area at the first through hole 11 is small, which will cause a greater throttling effect on the fluid and fail to meet the flow requirements of the electronic expansion valve in the throttling state. Through the above setting, the flow effect of the fluid when flowing through the muffler assembly can be guaranteed, meeting the application requirements of the electronic expansion valve in the air conditioning dehumidification mode. Among them, L5*R1 can be set to 0.75S1, S1 or 1.25S1.

[0107] In one embodiment, the diameter of the first muffler block 10 is R2, and the flow area of ​​the first valve port 41 is S1. R2 ≥ 2S1. When R2 < 2S1, the diameter of the first muffler block 10 is too small. When the fluid passes through the first muffler block 10 to decompose bubbles, the diameter of the first muffler block 10 is too small and cannot match the flow rate of the fluid at the first valve port 41. This will produce a large flow resistance to the fluid and reduce the flow efficiency of the fluid. In this application, by setting R2 ≥ 2S1, the area of ​​the decomposition area of ​​the first muffler block 10 can be guaranteed and the flow resistance of the fluid can be reduced. Among them, R2 can be set to 2S1, 2.2S1, or 2.5S1.

[0108] In some embodiments, the ratio of the number of second through holes 21 to the flow area of ​​the first valve port 41 should be greater than or equal to 1.5. When the flow area of ​​the first valve port 41 is determined, the greater the number of second through holes 21, the lower the risk of the second silencer block 20 being clogged by dirt, thereby ensuring the flow efficiency of the fluid. When the ratio of the number of second through holes 21 to the flow area of ​​the first valve port 41 is less than 1.5, the number of second through holes 21 is too small, and there is a greater risk of the second through holes 21 being clogged by dirt. In this application, by setting the ratio of the number of second through holes 21 to the flow area of ​​the first valve port 41 to be greater than or equal to 1.5, the risk of the second silencer block 20 being clogged by dirt can be reduced, and the electronic expansion valve can be prevented from generating a large flow resistance to the fluid during the flow regulation process of the fluid, thereby ensuring the flow efficiency of the fluid and the operation effect of the air-conditioning system.

[0109] The electronic expansion valve provided in this application can simultaneously meet the requirements of the indoor electronic expansion valve for the cooling, heating, and dehumidification functions of the air conditioning system. Compared with traditional solutions, the electronic expansion valve has the following advantages:

[0110] 1. When the dehumidification solenoid valve is running in dehumidification mode, the flow rate is fixed at a certain flow rate and cannot be adjusted. It is impossible to accurately match the dehumidification capacity and condensation heat release, resulting in a significant reduction in the effect of dehumidification without cooling. The throttling opening of the electronic expansion valve can be accurately adjusted according to the control logic of the whole machine manufacturer, thereby improving the effect of dehumidification without cooling and enhancing the user experience;

[0111] 2. When the dehumidification solenoid valve is in fully closed mode, the small flow rate needs to be controlled by the throttling hole on the internal throttling plate. The throttling hole is mostly stamped and has poor dimensional accuracy. When the dehumidification solenoid valve is running, the throttling of the dehumidification solenoid valve is unstable, resulting in fluctuations in superheat and affecting the dehumidification efficiency. The use of this electronic expansion valve can accurately control the flow rate. The internal related parts are processed and matched with high precision, and the throttling stability is high.

[0112] 3. Since the dehumidification solenoid valve is used indoors, it makes obvious noise when it is turned on and off. The use of this electronic expansion valve can effectively reduce mechanical noise.

[0113] 4. The flow rate of the electronic expansion valve in both fully open and small-open flow modes can be precisely controlled according to the requirements of the air conditioner, making it applicable to air conditioners of different specifications. This means that air conditioners with different cooling capacities can use a single electronic expansion valve, promoting standardization of key components and improving the applicability of electronic expansion valves.

[0114] The foregoing description is merely a few embodiments of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A silencer assembly, characterized in that: The muffler assembly includes a muffler structure having a circulation area and a decomposition area. Bubbles in the fluid flowing through the muffler assembly can be decomposed through the decomposition area. The muffler structure includes: A first silencer block (10) and a second silencer block (20), wherein the first silencer block (10) and the second silencer block (20) are filter mesh sintered blocks, the first silencer block (10) and the second silencer block (20) are spaced apart along the flow direction of the fluid, and the first silencer block (10) and the second silencer block (20) are both provided with the flow area and the decomposition area, wherein the flow area at least partially provided on the first silencer block (10) is provided correspondingly to the decomposition area provided on the second silencer block (20), and the flow area at least partially provided on the second silencer block (20) is provided correspondingly to the decomposition area provided on the first silencer block (10).

2. The sound-absorbing assembly according to claim 1, wherein: The first muffler block (10) has a first through hole (11), and the second muffler block (20) has a plurality of second through holes (21); the first through hole (11) forms a flow area on the first muffler block (10), and the plurality of second through holes (21) form a flow area on the second muffler block (20).

3. The sound-absorbing assembly according to claim 2, wherein: The first muffler block (10) and the second muffler block (20) are coaxially arranged, the axis of the first through hole (11) coincides with the axis of the first muffler block (10), and a plurality of second through holes (21) are arranged on the second muffler block (20) at annular intervals around the axis of the second muffler block (20); along the flow direction of the fluid, the projection of the first through hole (11) does not coincide with the projection of the second through hole (21).

4. The sound-absorbing assembly according to claim 1, wherein: The pore size of the first silencer block (10) and the second silencer block (20) is 0.12-0.35 mm; the porosity of the first silencer block (10) and the second silencer block (20) is 45%-95%.

5. The sound-absorbing assembly according to claim 1, wherein: The muffler assembly further comprises a supporting structure, wherein the supporting structure is arranged between the first muffler block (10) and the second muffler block (20), and a gap is formed between the first muffler block (10) and the second muffler block (20) by the supporting structure.

6. The sound-absorbing assembly according to claim 5, characterized in that: A support ring (30) is provided between the first sound-absorbing block (10) and the second sound-absorbing block (20), and the support ring (30) is provided on the periphery of the second sound-absorbing block (20).

7. The sound-absorbing assembly according to claim 6, wherein: The support ring (30) has a circulation channel, the area of ​​the circulation channel is S2, the maximum projection area of ​​the silencer structure along the circulation direction is S3, and S2≥0.8*S3.

8. The sound-absorbing assembly according to claim 1, wherein: The muffler assembly further comprises a fixing sleeve (70), both ends of the fixing sleeve (70) having openings for fluid to pass through, and the first muffler block (10) and the second muffler block (20) are arranged at intervals in the cavity of the fixing sleeve (70).

9. The sound-absorbing assembly according to claim 8, wherein: The inner wall of the fixing sleeve (70) has a limiting surface (71), one end of the first silencer block (10) is limitedly matched with the limiting surface (71), and one end of the fixing sleeve (70) away from the first silencer block (10) is fixedly connected to the second silencer block (20); or, the first silencer block (10) and the second silencer block (20) are respectively fixedly connected to the fixing sleeve (70).

10. The sound-absorbing assembly according to claim 8, wherein: The end of the fixing sleeve (70) away from the first silencer block (10) has a flange structure (72), and the flange structure (72) and the end of the second silencer block (20) away from the first silencer block (10) are riveted together.

11. An electronic expansion valve, characterized in that: The electronic expansion valve includes the silencer assembly according to any one of claims 1 to 10, and the electronic expansion valve also includes a valve body (40), a guide sleeve (80), a valve needle assembly (60) and a nut structure, the guide sleeve (80) is installed in the valve body (40), the valve needle assembly (60) and the nut structure are threadedly matched, and at least a portion of the valve needle assembly (60) is located in the guide sleeve (80) so as to be guided by the guide sleeve (80).

12. The electronic expansion valve according to claim 11, characterized in that: The electronic expansion valve has a connecting pipeline (50), the valve body (40) has a first valve port (41), a connecting hole (42) is provided on the valve body (40), the connecting hole (42) is connected to the connecting pipeline (50), and the silencer component is provided at the connection between the connecting hole (42) and the connecting pipeline (50), or in the valve body (40), or in the connecting pipeline (50).

13. The electronic expansion valve according to claim 12, characterized in that: The valve needle assembly (60) is arranged corresponding to the first valve port (41), and the first valve port (41) has a straight section (411) and a tapered section (412) that are interconnected. The straight section (411) is arranged away from the valve needle assembly (60), and the tapered section (412) has a first port (4121) and a second port (4122) that are relatively arranged. The first port (4121) is arranged toward the valve needle assembly (60), and the diameter of the tapered section (412) gradually decreases from the first port (4121) to the second port (4122). The valve needle assembly (60) forms a sealing end at one end toward the first valve port (41), the diameter of the first port (4121) is larger than the diameter of the sealing end, and the diameter of the second port (4122) is smaller than or equal to the diameter of the sealing end. The valve needle assembly (60) can move relative to the first valve port (41) to adjust the flow at the first valve port (41).

14. The electronic expansion valve according to claim 13, characterized in that: The total flow area of ​​the decomposition area and the flow area is greater than or equal to 50% of the flow area of ​​the first valve port (41).

15. The electronic expansion valve according to claim 12, characterized in that: The set of projections of the decomposition area of ​​the first muffler block (10) and the decomposition area of ​​the second muffler block (20) of the muffler assembly in the flow direction covers the cross section of the flow channel of the connecting pipe (50).

16. The electronic expansion valve according to claim 12, characterized in that: The first muffler block (10) of the muffler assembly is arranged close to the first valve port (41), and there is a gap between the first valve port (41) and the first muffler block (10). The distance between the port of the first valve port (41) close to the first muffler block (10) and the first muffler block (10) is L1, and L1 is ≥ 1 mm.

17. The electronic expansion valve according to claim 12, characterized in that: The flow area of ​​the first valve port (41) is S1, the projected area of ​​the second silencer block (20) of the silencer assembly along the flow direction is S4, and S4 / S1>2.

18. The electronic expansion valve according to claim 12, characterized in that: The first muffler block (10) of the muffler assembly has a first through hole (11), a flow area of ​​the first through hole (11) is S5, a diameter of the first through hole (11) is R1, a distance between the first muffler block (10) and the second muffler block (20) is L2, and π*R1*L2≥1.2*S5.

19. The electronic expansion valve according to claim 12, characterized in that: The flow area of ​​the first valve port (41) is S1, the first silencer block (10) of the silencer assembly is provided with a first through hole (11), the flow area of ​​the first through hole (11) is S5, and S5>0.4*S1.

20. The electronic expansion valve according to claim 12, characterized in that: The communicating hole (42) comprises a first hole section (421), a second hole section (422) and a third hole section (423) which are arranged in a stepped manner. The first hole section (421), the second hole section (422) and the third hole section (423) are connected in sequence. The inner diameter of the first hole section (421) is smaller than the inner diameter of the second hole section (422). A first stepped surface (424) is formed between the first hole section (421) and the second hole section (422). The inner diameter of the second hole section (422) is smaller than the inner diameter of the third hole section (423). A second stepped surface (425) is formed between the second hole section (422) and the third hole section (423). The first muffler block (10) of the muffler assembly is arranged in the second hole section (422). The first muffler block (10) and the muffler A support ring (30) is provided between the second muffler block (20) of the component, the support ring (30) is provided in the third hole section (423), one end of the first muffler block (10) abuts against the first stepped surface (424), the other end of the first muffler block (10) is provided toward the support ring (30), the end of the support ring (30) close to the first muffler block (10) abuts against the second stepped surface (425), the second muffler block (20) is provided in the third hole section (423), one end of the second muffler block (20) abuts against the support ring (30), the connecting pipe (50) is inserted in the third hole section (423), and the end of the second muffler block (20) away from the support ring (30) abuts against the end face of the connecting pipe (50).

21. The electronic expansion valve according to claim 20, characterized in that: The diameter of the first silencer block (10) is R2, the width of the first step surface (424) is L3, and L3 is greater than or equal to 0.03*R2; the diameter of the second silencer block (20) is R3, and the thickness of the support ring (30) in the circumferential direction is L4, and L4 is greater than or equal to 0.02*R3.

22. The electronic expansion valve according to claim 11, characterized in that The guide sleeve (80) has a first valve port (41), and the valve needle assembly (60) includes a first valve needle structure (61) and a second valve needle structure (62), the first valve needle structure (61) is used to open and close the first valve port (41), the first valve needle structure (61) has a second valve port (611), and the second valve needle structure (62) is used to open and close the second valve port (611); the silencer assembly is installed on the side of the second valve port (611) facing away from the second valve needle structure (62).

23. The electronic expansion valve according to claim 22, characterized in that: The first valve needle structure (61) includes a valve needle body (612), a sealing gasket (613) and a limiting member (614). The valve needle body (612) is used to open and close the first valve port (41). The sealing gasket (613) and the limiting member (614) are both arranged in the cavity of the valve needle body (612). The sealing gasket (613) has the second valve port (611). The limiting member (614) and the valve needle body (612) are fixedly connected and limit the sealing gasket (613). The silencer assembly is fixedly connected to the valve needle body (612) or the limiting member (614).

24. The electronic expansion valve according to claim 23, characterized in that The silencer assembly further comprises a fixing sleeve (70), both ends of the fixing sleeve (70) have openings for fluid to pass through, the first silencer block (10) and the second silencer block (20) are arranged at intervals in the cavity of the fixing sleeve (70), one end of the fixing sleeve (70) and the limiting member (614) are interference fit or welded or riveted; the limiting member (614) is annular, the limiting member (614) is arranged around the second valve port (611), the inner wall of the limiting member (614) has an inner annular step (615), the outer wall of the fixing sleeve (70) has an outer annular step (73), and the outer annular step (73) and the inner annular step (615) are limitedly fitted.

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