Silencing assembly and electronic expansion valve with same

Abstract

The utility model provides a noise reduction assembly and an electronic expansion valve with the noise reduction assembly, the noise reduction assembly comprises a noise reduction structure, the noise reduction structure is provided with a circulation area and a decomposition area, bubbles in fluid flowing through the noise reduction assembly can be decomposed through the decomposition area, the noise reduction structure comprises a first noise reduction block and a second noise reduction block which are both filter screen sintering blocks, the first noise reduction block and the second noise reduction block are arranged in a spaced mode in the flowing direction of fluid, the first noise reduction block and the second noise reduction block are each provided with a flowing area and a decomposition area, at least part of the flowing area arranged on the first noise reduction block corresponds to the noise reduction area arranged on the second noise reduction block, and at least part of the decomposition area corresponds to the noise reduction area arranged on the second noise reduction block. And at least part of the circulation area arranged on the second silencing block corresponds to the silencing area arranged on the first silencing block. By means of the technical scheme, the problem that in the prior art, the noise reduction effect of a noise reduction assembly is poor can be solved.

Description

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

[0002] The utility model relates to electronic expansion valve silencing technical field, specifically, relate to a silencing assembly and electronic expansion valve having the same. BACKGROUND

[0003] At present, in 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 provided 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. SUMMARY

[0005] The utility model provides a silencing assembly and an electronic expansion valve having the same to solve the problem of poor noise reduction effect of the silencing assembly in the prior art.

[0006] According to one aspect of the utility model, a silencing assembly is provided. The silencing assembly includes a silencing structure having a flow-through region and a decomposition region. Bubbles in the fluid flowing through the silencing assembly can be decomposed by the decomposition region. The silencing structure includes a first silencing block and a second silencing block. The first silencing block and the second silencing block are arranged in a flow direction of the fluid. The first silencing block and the second silencing block each have a flow-through region and a decomposition region. At least part of the flow-through region arranged on the first silencing block is arranged corresponding to the decomposition region arranged on the second silencing block. At least part of the flow-through region arranged on the second silencing block is arranged corresponding to the decomposition region arranged on the first silencing block.

[0007] The technical scheme provided by the utility model has the advantages that the sound-absorbing structure is provided with the flow-through area and the decomposition area on the first sound-absorbing block and the second sound-absorbing block, the larger bubbles in the two-phase fluid flowing through the decomposition area are decomposed into smaller bubbles in the decomposition area, so that the size of the bubbles in the fluid becomes uniform, thereby reducing the abnormal noise generated by the unstable and discontinuous large bubbles when flowing, and the impurities in the fluid can flow through the sound-absorbing assembly through the flow-through area, preventing the sound-absorbing assembly from being blocked, and the flow-through area provided on the first sound-absorbing block and the decomposition area provided on the second sound-absorbing block are correspondingly arranged, the flow-through area provided on the second sound-absorbing block and the decomposition area provided on the first sound-absorbing block are correspondingly arranged, that is, the projection of the flow-through area of the first sound-absorbing block on the second sound-absorbing block coincides with the decomposition area of the second sound-absorbing block, and the projection of the flow-through area of the second sound-absorbing block on the first sound-absorbing block coincides with the decomposition area of the first sound-absorbing block, so that the bubbles in the fluid mixed with impurities can flow through the flow-through area on the first sound-absorbing block or the second sound-absorbing block and then flow through the decomposition area on the first sound-absorbing block or the second sound-absorbing block again for decomposition.

[0008] Further, the first sound-absorbing block and the second sound-absorbing block are filter screen sintered blocks, the first sound-absorbing block is provided with a first through hole, and the second sound-absorbing block is provided with a plurality of second through holes, the first through hole forms the flow-through area on the first sound-absorbing block, and the second through hole forms the flow-through area on the second sound-absorbing block.

[0009] Further, the projection of the first through hole and the projection of the second through hole do not coincide in the flow direction of the fluid. Through the above arrangement, more fluid can flow through the decomposition area of the sound-absorbing assembly, and the sound-absorbing effect of the sound-absorbing assembly is improved.

[0010] Further, the pore size of the first sound-absorbing block and the second sound-absorbing block is 0.12-0.35mm. Through the above arrangement, the decomposition effect of the first sound-absorbing block and the second sound-absorbing block can be ensured while the influence of the first sound-absorbing block and the second sound-absorbing block on the fluid flow is reduced.

[0011] Further, the porosity of the first sound-absorbing block and the second sound-absorbing block is 45%-95%. Through the above arrangement, the noise reduction effect of the sound-absorbing structure can be improved while the smoothness of the fluid flow is ensured.

[0012] Further, the sound attenuation assembly further comprises a support structure, the support structure is arranged between the first sound attenuation block and the second sound attenuation block, and a gap is formed between the first sound attenuation block and the second sound attenuation block through the support structure. Through the above arrangement, impurities can flow through the first sound attenuation block and the second sound attenuation block, and the first sound attenuation block or the second sound attenuation block is prevented from being blocked by dirt.

[0013] Further, a support ring is arranged between the first sound attenuation block and the second sound attenuation block, and the support ring is arranged at the periphery of the second sound attenuation block. Through the above arrangement, the stability of the first sound attenuation block and the second sound attenuation block can be ensured.

[0014] Further, the support ring has a flow passage, the area of the flow passage is S2, the maximum projection area of the sound attenuation structure along the flow direction is S3, and S2 is greater than or equal to 0.8*S3. Through the above arrangement, the flow resistance of the fluid flowing through the support ring can be reduced while ensuring the supporting effect of the support ring on the first sound attenuation block.

[0015] Further, the sound attenuation assembly further comprises a fixing sleeve, both ends of the fixing sleeve have openings for the fluid to pass through, and the first sound attenuation block and the second sound attenuation block are arranged in the cavity of the fixing sleeve.

[0016] Further, the inner wall of the fixing sleeve has a limiting surface, one end of the first sound attenuation block is in limiting cooperation with the limiting surface, and the end of the fixing sleeve away from the first sound attenuation block is fixedly connected with the second sound attenuation block; and / or, the first sound attenuation block and the second sound attenuation block are fixedly connected with the fixing sleeve respectively.

[0017] Further, the end of the fixing sleeve away from the first sound attenuation block has a flange structure, and the flange structure is riveted with the end of the second sound attenuation block away from the first sound attenuation block.

[0018] According to another aspect of the utility model, an electronic expansion valve is provided, and the electronic expansion valve comprises the above sound attenuation assembly. By arranging the above sound attenuation assembly in the electronic expansion valve, the bubbles in the fluid before and after throttling of the electronic expansion valve can be made more uniform, the noise during fluid flow is reduced, and the use performance of the electronic expansion valve is improved.

[0019] Further, the electronic expansion valve has a valve body and a connecting pipeline, the valve body has a first valve port, the valve body is provided with a communication hole, the communication hole is connected with the connecting pipeline, and the sound attenuation assembly is arranged at the connection position of the communication hole and the connecting pipeline, in the valve body, or in the connecting pipeline. Through the above arrangement, the sound attenuation assembly can be conveniently disassembled.

[0020] Further, the electronic expansion valve further comprises a valve needle assembly corresponding to the first valve port, the first valve port has a straight section and a tapered section in communication with each other, the straight section is arranged away from the valve needle assembly, the tapered section has a first port and a second port arranged oppositely, the first port is arranged towards the valve needle assembly, the diameter of the tapered section gradually decreases from the first port to the second port, one end of the valve needle assembly towards the first valve port forms a sealing end, the diameter of the first port is greater than that of the sealing end, the diameter of the second port is less than or equal to that of the sealing end, and the valve needle assembly is movable relative to the first valve port to adjust the flow at the first valve port. Through the above arrangement, when the valve needle assembly moves at the first valve port, the distance between the sealing end and the inner wall of the first valve port can be adjusted, so that the sealing end of the valve needle assembly can cooperate with the first valve port to adjust the flow through the first valve port.

[0021] Further, the projection of the decomposed area of the first sound attenuation block of the sound attenuation assembly and the decomposed area of the second sound attenuation block in the flow direction collectively covers the cross section of the flow passage of the connecting pipeline. Through the above arrangement, the area of the decomposed area can be increased, and thus the noise reduction effect of the sound attenuation assembly can be improved.

[0022] Further, the total flow area of the sound attenuation 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 sound attenuation assembly on the fluid flow can be reduced, and the flow efficiency of the fluid can be improved.

[0023] Further, the first sound attenuation block of the sound attenuation assembly is arranged close to the first valve port, and the first valve port has a spacing with the first sound attenuation block, the distance between the port of the first valve port close to the first sound attenuation block and the first sound attenuation block is L1, and L1≥1mm. Through the above arrangement, the influence of the sound attenuation assembly on the fluid flow can be reduced.

[0024] Further, the flow area of the first valve port is S1, the projection area of the second sound attenuation block of the sound attenuation assembly in the flow direction is S4, and S4 / S1>2. Through the above arrangement, the smoothness of the fluid flow can be improved.

[0025] Further, the first sound attenuation block of the sound attenuation 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 sound attenuation block and the second sound attenuation block is L2, and π*R1*L2≥1.2*S5. Through the above arrangement, the flow efficiency of the fluid can be improved.

[0026] Further, the flow area of the first valve port is S1, the first sound attenuation block of the sound attenuation 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 sound attenuation assembly can be improved, and thus the flow efficiency of the fluid can be improved.

[0027] Further, the communication hole has a first hole section, a second hole section and a third hole section arranged in steps, the first hole section, the second hole section and the third hole section are sequentially communicated, the inner diameter of the first hole section is smaller than the inner diameter of the second hole section, a first stepped 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 stepped surface is formed between the second hole section and the third hole section, the first sound attenuation block of the sound attenuation assembly is arranged in the second hole section, a support ring is arranged between the first sound attenuation block and the second sound attenuation block of the sound attenuation assembly, the support ring is arranged in the third hole section, one end of the first sound attenuation block abuts against the first stepped surface, the other end of the first sound attenuation block is arranged towards the support ring, the end of the support ring close to the first sound attenuation block abuts against the second stepped surface, the second sound attenuation block is arranged in the third hole section, one end of the second sound attenuation block abuts against the support ring, the connecting pipeline is inserted in the third hole section, and the end of the second sound attenuation block away from the support ring abuts against the end surface of the connecting pipeline. Through the above arrangement, the stability of the sound attenuation assembly assembled in the communication hole can be improved, and the installation of the sound attenuation assembly and the electronic expansion valve is facilitated.

[0028] Further, the diameter of the first sound attenuation block is R2, the width of the first stepped surface is L3, and L3≥0.03*R2. Through the above arrangement, the limiting effect of the first stepped surface can be ensured, and the stability of the first sound attenuation block fixed in the communication hole is improved.

[0029] Further, the diameter of the second sound attenuation block is R3, the thickness of the support ring in the circumferential direction is L4, and L4≥0.02*R3. Through the above arrangement, the limiting effect of the second stepped surface can be ensured, and the stability of the second sound attenuation block fixed in the communication hole is improved.

[0030] Alternatively, the electronic expansion valve comprises a valve body and a valve needle assembly movably arranged in the valve body, the valve body has a first valve port, the valve needle assembly comprises a first valve needle structure and a second valve needle structure, the first valve needle structure is used for opening and closing the first valve port, the first valve needle structure has a second valve port therein, and the second valve needle structure is used for opening and closing the second valve port; the sound attenuation assembly is installed on the side of the second valve port away from the second valve needle structure.

[0031] Further, the first valve needle structure comprises a valve needle body, a sealing gasket and a limiting piece, the valve needle body is used for opening and closing the first valve port, the sealing gasket and the limiting piece are arranged in the cavity of the valve needle body, the sealing gasket has the second valve port, the limiting piece is fixedly connected with the valve needle body and limits the sealing gasket, and the sound attenuation assembly is fixedly connected with the valve needle body or the limiting piece.

[0032] Further, the sound attenuation assembly further comprises a fixing sleeve, both ends of the fixing sleeve have openings for fluid to pass through, the first sound attenuation block and the second sound attenuation block are arranged in the cavity of the fixing sleeve in a spaced manner, and one end of the fixing sleeve is in interference fit, welding or riveting with the limiting piece.

[0033] Further, a support ring is arranged between the first sound attenuation block and the second sound attenuation block.

[0034] Further, the limiting piece is annular, the limiting piece is arranged around the second valve port, an inner wall of the limiting piece has an inner annular step, an outer wall of the fixing sleeve has an outer annular step, and the outer annular step and the inner annular step are in limiting fit. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein in conjunction with the related discussion. The embodiments of the application, together with its advantages, can be understood by reference to the following description taken in conjunction with the accompanying drawings, of which:

[0036] Figure 1 Fig. 1 shows a structure schematic view of the sound attenuation assembly and the valve body cooperating with each other according to the first embodiment of the present application;

[0037] Figure 2 Fig. 1 shows a structure schematic view of the sound attenuation assembly according to the first embodiment of the present application;

[0038] Figure 3 Fig. 2 shows a partial enlarged view of A in Fig. 1; Figure 1

[0039] Figure 4 Fig. 3 shows a top view of the first sound attenuation block according to the first embodiment of the present application;

[0040] Figure 5 Fig. 4 shows a top view of the supporting ring according to the first embodiment of the present application;

[0041] Figure 6 Fig. 5 shows a top view of the second sound attenuation block according to the first embodiment of the present application;

[0042] Figure 7 Fig. 6 shows a structure schematic view of the second sound attenuation block according to the second embodiment of the present application;

[0043] Figure 8 Fig. 7 shows a structure schematic view of the electronic expansion valve according to the present application;

[0044] Figure 9 Fig. 8 shows a partial enlarged view of B in Fig. 7; Figure 8

[0045] Fig. 9 shows a structure schematic view of the electronic expansion valve according to another embodiment of the present application; Figure 10

[0046] Fig. 10 shows a partial enlarged view of C in Fig. 9; Figure 11 Figure 10

[0047] Figure 12 ​​​The utility model discloses a schematic diagram of the electronic expansion valve in the air conditioning system is shown.

[0048] Among them, the above-mentioned drawing includes the following figure mark:

[0049] 10, first sound elimination block, 11, first through hole,

[0050] 20, second sound elimination block, 21, second through hole,

[0051] 30, support ring,

[0052] 40, valve body,

[0053] 41, first valve port, 411, straight line section, 412, conical section, 4121, first port, 4122, second port,

[0054] 42, communication hole, 421, first hole section, 422, second hole section, 423, third hole section, 424, first step surface, 425, second step surface, 43, flow port,

[0055] 50, connecting pipeline,

[0056] 60, valve needle assembly, 61, first valve needle structure, 611, second valve port, 612, valve needle main body, 613, sealing pad, 614, limiting piece, 615, inner annular step, 62, second valve needle structure,

[0057] 70, fixed sleeve, 71, limiting surface, 72, flanging structure, 73, outer annular step,

[0058] 100, fluid flow circuit, 200, control valve, 300, first heat exchanger, 400, second heat exchanger. DETAILED DESCRIPTION

[0059] The technical scheme in the utility model embodiments will be described clearly and completely below in conjunction with the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of the utility model protection.

[0060] As Figures 1 to 3The utility model discloses an embodiment provides a sound attenuation assembly, sound attenuation assembly includes sound attenuation structure, and sound attenuation structure has the flow area and decomposition area, and the bubble in the fluid flowing through sound attenuation assembly can pass through decomposition area and decomposes, and sound attenuation structure includes: first sound attenuation block 10 and second sound attenuation block 20, first sound attenuation block 10 and second sound attenuation block 20 are spaced apart along the flow direction of fluid, and first sound attenuation block 10 and second sound attenuation block 20 are all provided with flow area and decomposition area, wherein, at least partial flow area arranged on first sound attenuation block 10 is correspondingly arranged with decomposition area arranged on second sound attenuation block 20, and at least partial flow area arranged on second sound attenuation block 20 is correspondingly arranged with decomposition area arranged on first sound attenuation block 10.

[0061] The utility model discloses a technical scheme, and sound attenuation structure first sound attenuation block 10 and second sound attenuation block 20 are all provided with flow area and decomposition area, and the larger bubble in the two-phase fluid flowing through decomposition area can be decomposed into smaller bubble in decomposition area, so that the bubble size in the fluid becomes uniform, thereby reducing the abnormal noise generated when the unstable and discontinuous large bubble flows, and the impurities in the fluid can flow through sound attenuation assembly through flow area, preventing sound attenuation assembly from being blocked, and in the application, at least partial flow area arranged on first sound attenuation block 10 is correspondingly arranged with decomposition area arranged on second sound attenuation block 20, and at least partial flow area arranged on second sound attenuation block 20 is correspondingly arranged with decomposition area arranged on first sound attenuation block 10, that is, the projection of at least partial flow area of first sound attenuation block 10 on second sound attenuation block 20 coincides with the decomposition area of second sound attenuation block 20, and the projection of at least partial flow area of second sound attenuation block 20 on first sound attenuation block 10 coincides with the decomposition area of first sound attenuation block 10, so that the bubble in the fluid mixed with impurities can still flow through the decomposition area on first sound attenuation block 10 or second sound attenuation block 20 after flowing through the flow area on first sound attenuation block 10 or second sound attenuation block 20. Compared with the technical scheme in the prior art, which needs to separately arrange a fixing structure to fix the sound attenuation structure and make the impurities flow through the fixing structure, the technical scheme provided by the application can increase the area for bubble decomposition in the sound attenuation assembly, improve the decomposition effect of the sound attenuation assembly, and thus improve the noise reduction capacity of the sound attenuation assembly.

[0062] Specifically, the first sound attenuation block 10 and the second sound attenuation block 20 are filter sintered blocks, the first sound attenuation block 10 is provided with a first through hole 11, and the second sound attenuation block 20 is provided with a plurality of second through holes 21, the first through hole 11 forms a flow-through area on the first sound attenuation block 10, and the second through hole 21 forms a flow-through area on the second sound attenuation block 20. The filter sintered block is woven by 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 with high strength and stability, which can effectively play a filtering effect. By providing the first through hole 11 on the first sound attenuation block 10 and the second through hole 21 on the second sound attenuation block 20, a hole with a larger diameter can be formed on the filter sintered block, so that impurities in the fluid cannot flow through the first sound attenuation block 10 and the second sound attenuation block 20, preventing the first sound attenuation block 10 and the second sound attenuation block 20 from being clogged.

[0063] Referring to Figures 3 to 6 In the first specific embodiment of the present application, the first sound attenuation block 10 and the second sound attenuation block 20 are coaxially arranged, the axis of the first through hole 11 coincides with the axis of the first sound attenuation block 10, and the plurality of second through holes 21 are annularly and spacedly arranged on the second sound attenuation block 20 around the axis of the second sound attenuation block 20. Through the above arrangement, it can be prevented that the fluid directly passes through the first through hole 11 and the second through hole 21, the fluid flowing through the first through hole 11 can pass through the part of the second sound attenuation block 20 except the second through hole 21, and the fluid flowing through the second through hole 21 can pass through the part of the first sound attenuation block 10 except the first through hole 11, so that more fluid can pass through the decomposition area for filtering, thereby improving the noise reduction effect of the sound attenuation assembly; and the plurality of second through holes 21 are annularly and spacedly arranged on the second sound attenuation block 20 around the axis of the second sound attenuation block 20, so that the fluid exerts more uniform force on the second sound attenuation block 20 when passing through the second sound attenuation block 20, thereby improving the stability of the sound attenuation structure.

[0064] Specifically in the present application, the projection of the first through hole 11 and the projection of the second through hole 21 do not coincide along the flow direction of the fluid, through the above arrangement, as many fluids as possible can pass through the decomposition area, thereby improving the sound attenuation effect of the sound attenuation assembly.

[0065] Referring to Figure 7 In the second specific embodiment of the present application, the plurality of second through holes 21 annularly and spacedly arranged around the axis of the second sound attenuation block 20 form a through hole group, the second sound attenuation 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 sound attenuation block 20, so that the number of second through holes 21 can be increased, and the force of fluid impact on each direction of the second sound attenuation block 20 is more balanced.

[0066] Specifically in the present application, the first through hole 11 and the second through hole 21 can be circular, regular polygonal or other shapes.

[0067] In the present application, the pore size of the first sound attenuation block 10 and the second sound attenuation block 20 is 0.12-0.35 mm. When the pore size of the first sound attenuation block 10 and the second sound attenuation block 20 is less than 0.12 mm, the pore size of the first sound attenuation block 10 and the second sound attenuation block 20 is too small, the spacing of the holes on the first sound attenuation block 10 and the second sound attenuation block 20 is too small, so that the first sound attenuation block 10 and the second sound attenuation block 20 will form greater resistance to the flow of fluid, affecting the flow of fluid; when the pore size of the first sound attenuation block 10 and the second sound attenuation block 20 is greater than 0.35 mm, the pore size of the first sound attenuation block 10 and the second sound attenuation block 20 is too large, the spacing of the holes on the first sound attenuation block 10 and the second sound attenuation block 20 is too large, the effect of decomposing large bubbles is poor, in the present application, by setting the pore size of the first sound attenuation block 10 and the second sound attenuation block 20 to 0.12-0.35 mm, the influence of the first sound attenuation block 10 and the second sound attenuation block 20 on the fluid flow can be reduced without affecting the decomposition effect of the first sound attenuation block 10 and the second sound attenuation block 20, preventing the first sound attenuation block 10 and the second sound attenuation block 20 from causing excessive throttling to the passing fluid, affecting the flow efficiency of the air conditioning system fluid. Specifically, the pore size of the first sound attenuation block 10 and the second sound attenuation block 20 can be set to 0.12 mm, 0.25 mm, 0.28 mm or 0.35 mm.

[0068] In the present application, the porosity of the first sound attenuation block 10 and the second sound attenuation block 20 is 45%-95%. The porosity refers to the ratio of the volume of the pores in the material to the total volume, when the porosity of the first sound attenuation block 10 and the second sound attenuation block 20 is less than 45%, then the ratio of the volume of the pores in the first sound attenuation block 10 and the second sound attenuation block 20 to the total volume is too small, the decomposition efficiency of the sound attenuation assembly for bubbles is poor, and the flow resistance of the fluid is increased, affecting the flow of the fluid; when the porosity of the first sound attenuation block 10 and the second sound attenuation block 20 is greater than 95%, then the ratio of the volume of the pores in the first sound attenuation block 10 and the second sound attenuation block 20 to the total volume is too large, the effect of the first sound attenuation block 10 and the second sound attenuation block 20 on the refinement of the bubbles is poor, in the present application, by setting the porosity of the first sound attenuation block 10 and the second sound attenuation block 20 to 45%-95%, the flow of the fluid can be ensured to be smooth while the noise reduction effect of the sound attenuation structure is improved. Specifically, the porosity of the first sound attenuation block 10 and the second sound attenuation block 20 can be set to 45%, 50%, 80% or 95%.

[0069] Specifically, the sound attenuation assembly further comprises a support structure arranged between the first sound attenuation block 10 and the second sound attenuation block 20, and a gap is formed between the first sound attenuation block 10 and the second sound attenuation block 20 through the support structure. Through the above arrangement, a flow channel for impurities can be formed between the first through hole 11 and the second through hole 21, so that the impurities can flow through the first sound attenuation block 10 and the second sound attenuation block 20 without being blocked by the first sound attenuation block 10 and the second sound attenuation block 20, thereby improving the use performance of the sound attenuation assembly.

[0070] Further, a support ring 30 is arranged between the first sound attenuation block 10 and the second sound attenuation block 20, and the support ring 30 is arranged at the periphery of the second sound attenuation block 20. By arranging the support ring 30, the relative displacement of the first sound attenuation block 10 and the second sound attenuation block 20 can be limited by the support ring 30, preventing the first sound attenuation block 10 or the second sound attenuation block 20 from being displaced under the impact of the fluid, thereby ensuring the stability of the first sound attenuation block 10 and the second sound attenuation block 20.

[0071] Specifically, in the present application, the support ring 30 needs to avoid the first through hole 11 and the second through hole 21, so as to prevent the support ring 30 from stopping the flow of impurities in the sound attenuation assembly.

[0072] Specifically, the support ring 30 has a flow channel, the area of the flow channel is S2, the maximum projection area of the sound attenuation structure along the flow direction is S3, and S2≥0.8*S3. When the area S2 of the flow channel is less than 0.8*S3, the flow area of the flow channel of the support ring 30 is relatively small, and the fluid will be subjected to a relatively large flow resistance when passing through the support ring 30, which affects the flow of the fluid and reduces the flow rate of the fluid passing through the first sound attenuation block 10, the second sound attenuation block 20 and the support ring 30. In the present application, by setting S2≥0.8*S3, the flow resistance of the fluid flowing through the support ring 30 can be reduced while ensuring the supporting effect of the support ring 30 on the first sound attenuation block 10, thereby ensuring the smoothness of the fluid flow. Specifically, S2 can be set to 0.8*S3, 0.85*S3 or 0.9*S3.

[0073] In some embodiments, as shown in Figure 10 and Figure 11 The sound attenuation assembly further comprises a fixing sleeve 70, both ends of the fixing sleeve 70 have openings for the fluid to pass through, and the first sound attenuation block 10 and the second sound attenuation block 20 are arranged in the cavity of the fixing sleeve 70. Through the arrangement of the fixing sleeve 70, the first sound attenuation block 10 and the second sound attenuation block 20 can be installed and the relative position of the first sound attenuation block 10 and the second sound attenuation block 20 can be limited. Moreover, the arrangement of the fixing sleeve 70 makes the sound attenuation assembly a modular structure as a whole, which is convenient for overall installation at a position where fluid sound attenuation is required.

[0074] Further, a support ring 30 is arranged between the first sound attenuation block 10 and the second sound attenuation block 20, and the support ring 30 is also arranged in the fixing sleeve 70, and the first sound attenuation block 10 and the second sound attenuation block 20 are spaced apart by the support ring 30.

[0075] Specifically, the inner wall of the fixing sleeve 70 is provided with a limiting surface 71, one end of the first sound attenuation block 10 is limited and matched with the limiting surface 71, and the end of the fixing sleeve 70 away from the first sound attenuation block 10 is fixedly connected with the second sound attenuation block 20; and / or, the first sound attenuation block 10 and the second sound attenuation block 20 are fixedly connected with the fixing sleeve 70 respectively. In this way, the fixing of the first sound attenuation block 10 and the second sound attenuation block 20 can be realized.

[0076] In Figure 11 , the end of the fixing sleeve 70 away from the first sound attenuation block 10 has a flange structure 72, and the flange structure 72 is riveted and matched with the end of the second sound attenuation block 20 away from the first sound attenuation block 10. In this way, the axial limiting of the first sound attenuation block 10 is realized by the limiting surface 71, and the axial limiting of the second sound attenuation block 20 is realized by the flange structure 72.

[0077] Further, the first sound attenuation block 10, the support ring 30 and the second sound attenuation block 20 abut in sequence, so that in combination with the limiting of the fixing sleeve 70, the first sound attenuation block 10 and the second sound attenuation block 20 can be limited in two directions in the axial direction.

[0078] In some embodiments, the first sound attenuation block 10 and the second sound attenuation block 20 are respectively welded with the fixing sleeve 70. Alternatively, the first sound attenuation block 10 and the second sound attenuation block 20 are fixedly connected with the fixing sleeve 70 in a manner of interference fit.

[0079] Referring to Figure 8 and Figure 9 , according to the embodiments of the present application, an electronic expansion valve is also provided, and the electronic expansion valve comprises the above-mentioned sound attenuation assembly. By arranging the above-mentioned sound attenuation assembly in the electronic expansion valve, the bubbles in the fluid before and after throttling by the electronic expansion valve can be made more uniform, the noise during fluid flow is reduced, and the use performance of the electronic expansion valve is improved.

[0080] Specifically, the electronic expansion valve has a valve body 40 and a connecting pipeline 50, the valve body 40 has a first valve port 41, and the valve body 40 is provided with a communication hole 42, and the communication hole 42 is connected with the connecting pipeline 50.

[0081] In a specific embodiment of the present application, the sound attenuation assembly is arranged at the connection between the communication hole 42 and the connecting pipeline 50, so that the replacement of the sound attenuation assembly can be facilitated. When the sound attenuation structure of the sound attenuation assembly is dirty and blocked, the valve body 40 can be disassembled from the connecting pipeline 50 to realize the replacement of the sound attenuation assembly, and the replacement can be performed without disassembling the valve body 40, thereby improving the convenience of maintenance.

[0082] In another specific embodiment of the present application, the sound attenuation assembly is arranged in the valve body 40, which can facilitate the installation of the sound attenuation assembly, and when the electronic expansion valve is installed, the installation process of the sound attenuation assembly does not need to be additionally increased, and the installation efficiency is improved.

[0083] In another specific embodiment of the present application, the sound attenuation assembly is arranged in the connecting pipeline 50, so that the fluid in the connecting pipeline 50 can pass through the sound attenuation assembly to decompose the larger bubbles, and the noise reduction effect of the sound attenuation assembly can be improved.

[0084] Specifically, the valve body 40 is provided with a plurality of communication holes 42, and the sound attenuation assembly can be arranged at one or more communication holes 42, or can be arranged on all communication holes 42, to further reduce the noise of the fluid flowing through the electronic expansion valve.

[0085] Further, in the present application, the first sound attenuation block 10 can be arranged towards the first valve port 41, or the second sound attenuation block 20 can be arranged towards the first valve port 41.

[0086] In the present application, the decomposition area of the first sound attenuation block 10 of the sound attenuation assembly and the decomposition area of the second sound attenuation block 20 are collectively covered in the projection of the flow direction to cover the cross section of the flow passage of the connecting pipeline 50. Through the above arrangement, when the fluid in the connecting pipeline 50 flows through the sound attenuation assembly, the larger bubbles in the fluid will be decomposed by the decomposition area of the first sound attenuation block 10 or the decomposition area of the second sound attenuation block 20, preventing some large bubbles from flowing through the decomposition area, and further improving the noise reduction effect of the sound attenuation assembly.

[0087] Specifically, 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. When the total flow area of the sound attenuation area 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 sound attenuation assembly will produce a large pressure drop, affecting the flow efficiency of the fluid. In the present application, by arranging the total flow area of the decomposition area and the flow area to be greater than or equal to 50% of the flow area of the first valve port 41, the influence of the sound attenuation assembly on the fluid flow can be reduced, and the flow efficiency of the fluid can be improved.

[0088] Specifically, the first sound attenuation block 10 of the sound attenuation assembly is arranged close to the first valve port 41, and the first valve port 41 has a spacing from the first sound attenuation block 10. The distance between the port of the first valve port 41 close to the first sound attenuation block 10 and the first sound attenuation block 10 is L1, and L1≥1 mm. When the distance between the port of the first valve port 41 close to the first sound attenuation block 10 and the first sound attenuation block 10 is less than 1 mm, the distance between the port of the first valve port 41 close to the first sound attenuation block 10 and the first sound attenuation block 10 is too small, which is not conducive to the flow of fluid in the first valve port 41 and the sound attenuation assembly, and the fluid will be subjected to a greater flow resistance. In the present application, by setting L1≥1 mm, the influence of the sound attenuation assembly on the fluid flow can be reduced. Specifically, L1 can be set to 1 mm, 1.5 mm, 2 mm or 3 mm.

[0089] Specifically, the flow area of the first valve port 41 is S1, and the projection area of the second sound attenuation block 20 of the sound attenuation assembly along the flow direction is S4, and S4 / S1>2. When the ratio of S4 to S1 is less than or equal to 2, the projection area of the second sound attenuation block 20 along the flow direction is too small, and the fluid will be subjected to a greater flow resistance. In the present application, by setting the ratio of S4 to S1 to be greater than 2, the smoothness of fluid flow can be improved. Specifically, the ratio of S4 to S1 can be set to 2.5, 2.7 or 3.

[0090] Specifically, the first sound attenuation block 10 of the sound attenuation 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 sound attenuation block 10 and the second sound attenuation block 20 is L2, and π*R1*L2≥1.2*S5. The flow area of the first through hole 11 between the first sound attenuation block 10 and the second sound attenuation block 20 is π*R1*L2. When the flow area of the first through hole 11 between the first sound attenuation block 10 and the second sound attenuation block 20 is less than 1.2 times the flow area of the first through hole 11, the fluid will be subjected to a greater flow resistance when flowing through the sound attenuation assembly. In the present application, by setting π*R1*L2≥1.2*S5, the flow efficiency of the fluid can be improved. The ratio between the flow area of the first through hole 11 between the first sound attenuation block 10 and the second sound attenuation block 20 and the flow area of the first through hole 11 can be set to 1.2, 1.3 or 1.5.

[0091] Specifically, the flow area of the first valve port 41 is S1, the first sound attenuation block 10 of the sound attenuation 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 excessively throttle the fluid, causing the fluid to flow slowly at the electronic expansion valve. In the present application, by setting S5>0.4*S1, the flow speed of the fluid flowing through the sound attenuation assembly can be improved, thereby improving the flow efficiency of the fluid. Specifically, 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.

[0092] In an embodiment of the present application, the communication hole 42 has a first hole section 421, a second hole section 422, and a third hole section 423 arranged in steps, the first hole section 421, the second hole section 422, and the third hole section 423 are sequentially communicated, the inner diameter of the first hole section 421 is smaller than the inner diameter of the second hole section 422, a first step 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 step surface 425 is formed between the second hole section 422 and the third hole section 423, the first sound attenuation block 10 of the sound attenuation assembly is arranged in the second hole section 422, a support ring 30 is arranged between the first sound attenuation block 10 and the second sound attenuation block 20 of the sound attenuation assembly, the support ring 30 is arranged in the third hole section 423, one end of the first sound attenuation block 10 abuts against the first step surface 424, the other end of the first sound attenuation block 10 is arranged towards the support ring 30, the end of the support ring 30 close to the first sound attenuation block 10 abuts against the second step surface 425, the second sound attenuation block 20 is arranged in the third hole section 423, one end of the second sound attenuation block 20 abuts against the support ring 30, the connecting pipeline 50 is inserted into the third hole section 423, and the end of the second sound attenuation block 20 away from the support ring 30 abuts against the end surface of the connecting pipeline 50. Through the above arrangement, the communication hole 42 and the connecting pipeline 50 can limit the sound attenuation assembly through the first hole section 421, the second hole section 422, and the third hole section 423 to prevent the sound attenuation assembly from falling off when it is impacted by the fluid. Specifically, in the present application, the first sound attenuation block 10 is in interference fit with the second hole section 422, and the support ring 30 and the second sound attenuation block 20 are in interference fit with the inner wall of the third hole section 423, which can further improve the stability of the assembly of the sound attenuation assembly in the communication hole 42, and at the same time, this installation method is more convenient, without the need for welding and other steps, facilitating the installation of the sound attenuation assembly and the electronic expansion valve.

[0093] Specifically, the diameter of the first sound attenuation block 10 is R2, and the width of the first stepped surface 424 is L3, and L3≥0.03*R2. When L3<0.03*R2, the width of the first stepped surface 424 is too small, and the limiting effect of the first sound attenuation block 10 is poor. The outer periphery of the first sound attenuation block 10 is prone to deformation and fall off from the second hole section 422. In the present application, by setting L3≥0.03*R2, the limiting effect of the first stepped surface 424 can be ensured. Specifically, the ratio of the width of the first stepped surface 424 to the diameter of the first sound attenuation block 10 can be set to 0.03, 0.04, or 0.05.

[0094] Specifically, the diameter of the second sound attenuation block 20 is R3, and the thickness of the support ring 30 in the circumferential direction is L4, and L4≥0.02*R3. When L4<0.02*R3, the width of the support ring 30 is too small, and the limiting effect of the support ring 30 on the second sound attenuation block 20 is poor. The outer periphery of the second sound attenuation block 20 is prone to deformation and fall off from the third hole section 423, causing the gap between the first sound attenuation block 10 and the second sound attenuation block 20 to decrease. In the present application, by setting L4≥0.02*R3, the stability of the second sound attenuation block 20 in the third hole section 423 can be ensured. Specifically, the ratio of the thickness of the support ring 30 in the circumferential direction to the diameter of the second sound attenuation block 20 can be set to 0.02, 0.03, 0.04, or 0.05.

[0095] Specifically, the electronic expansion valve further comprises a valve needle assembly 60, which is arranged corresponding to the first valve port 41. The first valve port 41 has a straight section 411 and a tapered section 412 that are in communication with each other. The straight section 411 is arranged away from the valve needle assembly 60. The tapered section 412 has a first port 4121 and a second port 4122 arranged opposite to each other. The first port 4121 is arranged towards the valve needle assembly 60. The diameter of the tapered section 412 gradually decreases from the first port 4121 to the second port 4122. One end of the valve needle assembly 60 towards the first valve port 41 forms a sealing end. The diameter of the first port 4121 is greater than that of the sealing end. The diameter of the second port 4122 is less than or equal to that 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. In this way, the electronic expansion valve can adjust the distance between the end of the valve needle assembly 60 and the first valve port 41 to adjust the flow at the first valve port 41. Specifically, the sealing end of the valve needle assembly 60 can enter the first port 4121 and move towards 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 changes with the movement of the valve needle assembly 60 in the tapered section 412. In this way, the adjustment of the fluid flow can be realized.

[0096] As Figure 10 and Figure 11As shown, in another embodiment, the electronic expansion valve comprises a valve body 40 and a valve needle assembly 60 movably arranged in the valve body 40, the valve body 40 has a first valve port 41, the valve needle assembly 60 comprises 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 therein, and the second valve needle structure 62 is used to open and close the second valve port 611; the sound attenuation assembly is mounted on the side of the second valve port 611 away from the second valve needle structure 62.

[0097] In a specific embodiment, the flow area of the second valve port 611 is smaller than that of the first valve port 41. The side wall of the valve body 40 has a flow port 43, and one end of the valve body 40 has a communication hole 42. When the first valve port 41 is open, the communication hole 42 communicates with the flow port 43 through the first valve port 41, and when the second valve port 611 is open, the communication hole 42 communicates with the flow port 43 through the second valve port 611. The sound attenuation assembly is mounted on the end of the first valve needle structure 61 facing the communication hole 42, and the sound attenuation assembly corresponds to the second valve port 611.

[0098] The sound attenuation assembly is mounted on the end of the first valve needle structure 61 facing the communication hole 42 and corresponding to the second valve port 611. In this way, the fluid passing through the second valve port 611 needs to pass through the sound attenuation assembly, so that the relatively large bubbles in the fluid flowing through the sound attenuation assembly are broken into smaller bubbles or directly disappear, reducing the noise generated by the breaking of large bubbles.

[0099] In this electronic expansion valve, according to the use requirements, it can be switched to open the first valve port 41 or the second valve port 611, so that the electronic expansion valve has different working states. When the first valve port 41 is open, the fluid passes through the first valve port 41, and the first valve port 41 has a larger flow area than the second valve port 611, so that the large flow of fluid can be realized. When the first valve port 41 is closed and the second valve port 611 is open, the fluid passes through the second valve port 611. Since the flow area of the second valve port 611 is small, small flow can be realized, and the opening of the second valve port 611 can be adjusted by moving the position of the second valve needle structure 62, so that accurate flow adjustment can be realized.

[0100] The electronic expansion valve can be applied to an air conditioning system. In this case, the first valve port 41 is closed, the second valve port 611 is open, and the fluid passes through the second valve port 611. Since the gas-liquid mixed state fluid contains bubbles, when passing through the sound attenuation assembly, the first sound attenuation block 10 and the second sound attenuation block 20 break the large bubbles into small bubbles or directly make the bubbles disappear, thereby reducing the noise generated by the breaking of large bubbles.

[0101] The first valve needle structure 61 comprises a valve needle body 612, a sealing gasket 613 and a limiting piece 614, the valve needle body 612 is used for opening and closing the first valve port 41, the sealing gasket 613 and the limiting piece 614 are arranged in the cavity of the valve needle body 612, the sealing gasket 613 has the second valve port 611, the limiting piece 614 is fixedly connected with the valve needle body 612 and limits the sealing gasket 613, and the sound attenuation assembly is fixedly connected with the valve needle body 612 or the limiting piece 614.

[0102] The support ring 30 is arranged between the first sound attenuation block 10 and the second sound attenuation block 20, and the first sound attenuation block 10 and the second sound attenuation block 20 are spaced and limited by the support ring 30.

[0103] The sealing gasket 613 is made of a non-metal material, so that the sealing effect when the second valve port 611 is closed can be improved. The limiting piece 614 is used for fixing the sealing gasket 613. The sound attenuation assembly can be connected with the valve needle body 612 or the limiting piece 614 according to needs.

[0104] As shown in Figure 11 The sound attenuation assembly further comprises a fixing sleeve 70, both ends of the fixing sleeve 70 have openings for fluid to pass through, the first sound attenuation block 10 and the second sound attenuation block 20 are arranged in the cavity of the fixing sleeve 70 in a spaced manner, and one end of the fixing sleeve 70 is in interference fit, welding or riveting connection with the limiting piece 614.

[0105] The fixing sleeve 70 is arranged, so that the first sound attenuation block 10 and the second sound attenuation block 20 can be mounted, and the relative positions of the first sound attenuation block 10 and the second sound attenuation block 20 are limited. Moreover, the fixing sleeve 70 and the limiting piece 614 are connected, so that the sound attenuation assembly is fixed.

[0106] Specifically, the limiting piece 614 is annular, the limiting piece 614 is arranged around the second valve port 611, the inner wall of the limiting piece 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 in limiting fit. Through the fit of the outer annular step 73 and the inner annular step 615, the fixing sleeve 70 is limited in the radial direction and the axial direction, and the position of the sound attenuation assembly is accurately limited.

[0107] As shown in Figure 12As shown, in the air conditioning system with dehumidification function, the air conditioning system comprises a fluid flow circulation loop 100 and a control valve 200, the control valve 200 is arranged on the fluid flow circulation loop 100 and between a first heat exchanger 300 and a second heat exchanger 400, the air conditioning system has a refrigeration and heating mode and a non-cooling dehumidification mode, when the air conditioning system is in the refrigeration and heating mode, the control valve 200 is fully open, and the refrigerant fluid is not throttled, the first heat exchanger 300 and the second heat exchanger 400 can be regarded as an integral heat exchanger to release heat or absorb heat; when the air conditioning system is in the non-cooling dehumidification mode, the first heat exchanger 300 is a condenser, the refrigerant fluid releases heat through the first heat exchanger 300, 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 throttles and depressurizes through the control valve 200 at a small flow rate, at this time, the second heat exchanger 400 acts as an evaporator to absorb heat, and the fan drives the indoor humid air to pass through the heat-absorbing second heat exchanger 400, so that the water vapor condenses and dew forms, thereby achieving the dehumidification effect, and at the same time, the indoor first heat exchanger 300 acts as a condenser to make the indoor air temperature rise, that is, the air passes through the second heat exchanger 400 for dew condensation and dehumidification, and passes through the first heat exchanger 300 for temperature rise, and under the action of the fan, it is circulated all the time, thereby achieving the effect of non-cooling dehumidification.

[0108] In the conventional technical solution, the control valve 200 is usually arranged as a dehumidification electromagnetic valve, the dehumidification electromagnetic valve has a valve needle and a valve port, the valve needle can open or block the valve port to control the on-off of the refrigerant fluid flow through the valve port, in order to realize the small-flow circulation mode, the electromagnetic valve is provided with a valve piece with a throttling hole on the valve core, so that the electromagnetic valve can flow through the refrigerant fluid at a small flow rate in the full-closed mode. However, this arrangement mode causes the flow rate of the refrigerant fluid to be fixed at a certain value and cannot be adjusted, the matching value of the dehumidification amount and the heating amount cannot be accurately controlled, the indoor temperature changes when dehumidification is performed, the non-cooling dehumidification effect is poor, and because the throttling hole is usually formed by stamping, the throttling effect is unstable, the superheat fluctuates, the energy efficiency of the air conditioning dehumidification operation is affected, and obvious mechanical noise exists in the opening and closing process of the electromagnetic valve, which affects the user experience.

[0109] The electronic expansion valve provided in the application can be arranged in the air conditioning pipeline as a dehumidification electronic expansion valve, when the air conditioner is in the normal refrigeration and heating mode, the valve needle assembly 60 is arranged away from the first valve port 41, at this time, the electronic expansion valve is in the fully open state; when the air conditioning system is in the dehumidification mode, the electronic expansion valve is switched to the small-flow throttling state, part of the valve needle assembly 60 enters the first valve port 41, and there is a certain gap between the inner wall of the first valve port 41 and the sealing end, the fluid can flow through the gap at a small flow rate to realize the throttling effect of the electronic expansion valve and realize the dehumidification function.

[0110] Specifically, the thickness of the first sound attenuation block 10 is L5, the diameter of the first through hole 11 is R1, and the flow area of the first valve port 41 is S1. L5*R1 is greater than or equal to 0.75S1. 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 smaller, which causes greater throttling effect on the fluid, and cannot meet the flow requirement of the electronic expansion valve in the throttling state. Through the above setting, the flow effect of the fluid flowing through the sound attenuation assembly can be ensured, and the application requirement of the electronic expansion valve in the air conditioning dehumidification mode can be met. Specifically, L5*R1 can be set to 0.75S1, S1 or 1.25S1.

[0111] Specifically, the diameter of the first sound attenuation block 10 is R2, and the flow area of the first valve port 41 is S1. R2 is greater than or equal to 2S1. When R2 is less than 2S1, the diameter of the first sound attenuation block 10 is too small. When the fluid passes through the first sound attenuation block 10 for bubble decomposition, the diameter of the first sound attenuation block 10 is small, which cannot match the flow of the fluid at the first valve port 41, and causes large flow resistance to the fluid, reducing the flow efficiency of the fluid. In the present application, R2 is greater than or equal to 2S1, which can ensure the decomposition area of the first sound attenuation block 10 and reduce the flow resistance of the fluid. Specifically, R2 can be set to 2S1, 2.2S1 or 2.5S1.

[0112] Specifically, 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. In the case where the flow area of the first valve port 41 is determined, the more the number of second through holes 21, the lower the risk of dirty blocking of the second sound attenuation block 20, and the better 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 risk that many second through holes 21 are dirty and blocked. In the present application, the ratio of the number of second through holes 21 to the flow area of the first valve port 41 is greater than or equal to 1.5, which can reduce the risk of dirty blocking of the second sound attenuation block 20, prevent the electronic expansion valve from causing large flow resistance to the fluid during flow regulation of the fluid, and further ensure the flow efficiency of the fluid and the operation effect of the air conditioning system.

[0113] The electronic expansion valve provided by the present application can meet the requirements of the indoor electronic expansion valve when the air conditioning system is in cooling, heating and dehumidification modes. Compared with the traditional scheme, the electronic expansion valve provided by the present application has the following advantages:

[0114] 1. When the dehumidification electromagnetic valve is running in the dehumidification working condition, the flow rate is fixed at a certain flow rate and cannot be adjusted, the dehumidification amount and the condensation heat release amount cannot be accurately matched, resulting in a significant reduction in the effect of dehumidification without temperature drop, and the throttling opening of the dehumidification electronic expansion valve can be accurately adjusted according to the control logic of the whole machine manufacturer, thereby improving the effect of dehumidification without temperature drop and improving the user experience;

[0115] 2. When the dehumidification electromagnetic valve is in the full-off mode, a small flow rate needs to be realized through the throttling small hole size on the internal throttling piece, the throttling small hole is mostly stamped, and the size precision is poor, when the dehumidification electromagnetic valve is running in the dehumidification working condition, the unstable throttling of the dehumidification electromagnetic valve causes the fluctuation of the superheat degree, affecting the dehumidification operation efficiency, and the use of the dehumidification 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;

[0116] 3. Since it is used on the indoor side, the noise of the dehumidification electromagnetic valve when turning on and off is relatively obvious, and the use of the electronic expansion valve can effectively reduce the mechanical noise;

[0117] 4. The flow rate of the electronic expansion valve when fully open and in the small opening flow rate mode can be accurately controlled according to the requirements of the air conditioning machine, one valve can be used for multiple specifications of machine models, one dehumidification electronic expansion valve can be used for different refrigerating capacity models, the standardization of key parts is improved, and the applicability of the electronic expansion valve is improved.

[0118] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0119] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the techniques, methods and devices should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0120] In the description of the utility model, it is understood that the orientation words such as '' front, back, up, down, left, right '' '' horizontal, vertical, perpendicular, horizontal '' and '' top, bottom '' and the like indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, in the absence of the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore can not be understood as the limitation of the protection scope of the utility model;The orientation words '' inside, outside '' refer to the inside and outside relative to the contour of each component.

[0121] For the convenience of description, spatial relative terms such as '' above'', '' above'', '' upper surface'', '' upper '' and the like can be used here to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawing. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as '' above '' or '' above '' other devices or structures will be positioned '' below '' or '' below '' other devices or structures. Thus, the exemplary term '' above '' can include both '' above '' and '' below '' orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used here is interpreted accordingly.

[0122] In addition, it should be noted that the use of '' first'', '' second '' and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore can not be understood as the limitation of the protection scope of the utility model.

[0123] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, for those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A sound attenuation assembly, characterized by, The sound attenuation assembly comprises a sound attenuation structure having a flow-through region and a bubble decomposition region, bubbles in fluid flowing through the sound attenuation assembly being able to be decomposed by the bubble decomposition region, the sound attenuation structure comprising: a first sound attenuation block (10) and a second sound attenuation block (20), the first sound attenuation block (10) and the second sound attenuation block (20) being spaced apart along a flow direction of the fluid, the first sound attenuation block (10) and the second sound attenuation block (20) each being provided with the flow-through region and the bubble decomposition region, wherein at least part of the flow-through region provided on the first sound attenuation block (10) is correspondingly provided with the bubble decomposition region provided on the second sound attenuation block (20), and at least part of the flow-through region provided on the second sound attenuation block (20) is correspondingly provided with the bubble decomposition region provided on the first sound attenuation block (10); the first sound attenuation block (10) and the second sound attenuation block (20) being filter screen sintered blocks, the first sound attenuation block (10) being provided with a first through hole (11), and the second sound attenuation block (20) being provided with a plurality of second through holes (21), the first through hole (11) forming the flow-through region on the first sound attenuation block (10), and the second through holes (21) forming the flow-through region on the second sound attenuation block (20).

2. The sound attenuation assembly of claim 1, wherein, the first sound attenuation block (10) and the second sound attenuation block (20) being coaxially arranged, an axis of the first through hole (11) coinciding with an axis of the first sound attenuation block (10), and the plurality of second through holes (21) being annularly and spaced apartly arranged on the second sound attenuation block (20) around the axis of the second sound attenuation block (20).

3. The sound attenuation assembly of claim 1, wherein, in the flow direction of the fluid, a projection of the first through hole (11) does not coincide with a projection of the second through hole (21).

4. The sound attenuation assembly of claim 1, wherein, a pore size of the first sound attenuation block (10) and the second sound attenuation block (20) being 0.12-0.35mm.

5. The sound attenuation assembly of claim 1, wherein, a porosity of the first sound attenuation block (10) and the second sound attenuation block (20) being 45%-95%.

6. The sound attenuation assembly of claim 1, wherein, the sound attenuation assembly further comprising a support structure, the support structure being arranged between the first sound attenuation block (10) and the second sound attenuation block (20), and a space being formed between the first sound attenuation block (10) and the second sound attenuation block (20) by the support structure.

7. The sound attenuation assembly of claim 6, wherein, a support ring (30) being arranged between the first sound attenuation block (10) and the second sound attenuation block (20), the support ring (30) being arranged at a peripheral edge of the second sound attenuation block (20).

8. The sound attenuation assembly of claim 7, wherein, the support ring (30) having a flow-through channel, an area of the flow-through channel being S2, a maximum projection area of the sound attenuation structure along the flow direction being S3, and S2≥0.8*S3.

9. The sound attenuation assembly of claim 1, wherein, the sound attenuation assembly further comprising a fixing sleeve (70), both ends of the fixing sleeve (70) being provided with openings for fluid to pass through, and the first sound attenuation block (10) and the second sound attenuation block (20) being spaced apartly arranged in a cavity of the fixing sleeve (70).

10. The sound attenuation assembly of claim 9, wherein, The inner wall of the fixing sleeve (70) has a limiting surface (71), one end of the first sound attenuation block (10) is in limiting fit with the limiting surface (71), and the end of the fixing sleeve (70) away from the first sound attenuation block (10) is fixedly connected with the second sound attenuation block (20); and / or, the first sound attenuation block (10) and the second sound attenuation block (20) are respectively fixedly connected with the fixing sleeve (70).

11. The sound attenuation assembly of claim 9, wherein, The end of the fixing sleeve (70) away from the first sound attenuation block (10) has a flange structure (72), and the flange structure (72) is in riveting fit with the end of the second sound attenuation block (20) away from the first sound attenuation block (10).

12. An electronic expansion valve characterized by The electronic expansion valve comprises the sound attenuation assembly according to any one of claims 1 to 11.

13. The electronic expansion valve according to claim 12, wherein The electronic expansion valve has a valve body (40) and a connecting pipeline (50), the valve body (40) has a first valve port (41), the valve body (40) is provided with a communication hole (42), the communication hole (42) is connected with the connecting pipeline (50), and the sound attenuation assembly is arranged at the connection position of the communication hole (42) and the connecting pipeline (50), or in the valve body (40), or in the connecting pipeline (50).

14. The electronic expansion valve according to claim 13, wherein The electronic expansion valve further comprises a valve needle assembly (60), the valve needle assembly (60) is arranged corresponding to the first valve port (41), the first valve port (41) has a straight line segment (411) and a tapered segment (412) in communication with each other, the straight line segment (411) is arranged away from the valve needle assembly (60), the tapered segment (412) has a first port (4121) and a second port (4122) arranged oppositely, the first port (4121) is arranged towards the valve needle assembly (60), the diameter of the tapered segment (412) gradually decreases from the first port (4121) to the second port (4122), one end of the valve needle assembly (60) towards the first valve port (41) forms a sealing end, the diameter of the first port (4121) is greater than the diameter of the sealing end, the diameter of the second port (4122) is less than or equal to the diameter of the sealing end, and the valve needle assembly (60) can move relative to the first valve port (41) to adjust the flow at the first valve port (41).

15. The electronic expansion valve of claim 13, wherein, The projection of the decomposition area of the first sound attenuation block (10) of the sound attenuation assembly and the decomposition area of the second sound attenuation block (20) in the flow direction covers the cross section of the flow passage of the connecting pipeline (50).

16. The electronic expansion valve of claim 14, wherein, 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).

17. The electronic expansion valve of claim 13, wherein The first sound attenuation block (10) of the sound attenuation assembly is arranged close to the first valve port (41), and there is a spacing between the first valve port (41) and the first sound attenuation block (10), the distance between the port of the first valve port (41) close to the first sound attenuation block (10) and the first sound attenuation block (10) is L1, and L1≥1mm.

18. The electronic expansion valve of claim 13, wherein, The flow area of the first valve port (41) is S1, and the projection area of the second sound attenuation block (20) of the sound attenuation assembly along the flow direction is S4, S4 / S1>2.

19. The electronic expansion valve of claim 13, wherein, The first sound attenuation block (10) of the sound attenuation 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, and the distance between the first sound attenuation block (10) and the second sound attenuation block (20) is L2, π*R1*L2≥1.2*S5.

20. The electronic expansion valve of claim 13, wherein, The flow area of the first valve port (41) is S1, and the first sound attenuation block (10) of the sound attenuation assembly has a first through hole (11), the flow area of the first through hole (11) is S5, S5>0.4*S1.

21. The electronic expansion valve of claim 13, wherein, The communication hole (42) has a first hole section (421), a second hole section (422) and a third hole section (423) arranged in steps, the first hole section (421), the second hole section (422) and the third hole section (423) are sequentially communicated, the inner diameter of the first hole section (421) is smaller than the inner diameter of the second hole section (422), a first step 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 step surface (425) is formed between the second hole section (422) and the third hole section (423), the first sound attenuation block (10) of the sound attenuation assembly is arranged in the second hole section (422), a support ring (30) is arranged between the first sound attenuation block (10) and the second sound attenuation block (20) of the sound attenuation assembly, the support ring (30) is arranged in the third hole section (423), one end of the first sound attenuation block (10) abuts against the first step surface (424), the other end of the first sound attenuation block (10) is arranged towards the support ring (30), one end of the support ring (30) close to the first sound attenuation block (10) abuts against the second step surface (425), the second sound attenuation block (20) is arranged in the third hole section (423), one end of the second sound attenuation block (20) abuts against the support ring (30), the connecting pipeline (50) is inserted in the third hole section (423), and one end of the second sound attenuation block (20) away from the support ring (30) abuts against the end face of the connecting pipeline (50).

22. The electronic expansion valve of claim 21, wherein, The diameter of the first sound attenuation block (10) is R2, and the width of the first step surface (424) is L3, L3≥0.03*R2.

23. The electronic expansion valve of claim 21, wherein, The diameter of the second sound attenuation block (20) is R3, and the thickness of the support ring (30) along the circumference is L4, L4≥0.02*R3.

24. The electronic expansion valve of claim 12, wherein, The electronic expansion valve comprises a valve body (40) and a valve needle assembly (60) movably arranged in the valve body (40), the valve body (40) has a first valve port (41), the valve needle assembly (60) comprises a first valve needle structure (61) and a second valve needle structure (62), the first valve needle structure (61) is used for opening and closing the first valve port (41), the first valve needle structure (61) has a second valve port (611) therein, and the second valve needle structure (62) is used for opening and closing the second valve port (611); the sound attenuation assembly is mounted on a side of the second valve port (611) away from the second valve needle structure (62).

25. The electronic expansion valve of claim 24, wherein, The first valve needle structure (61) comprises a valve needle body (612), a sealing gasket (613) and a limiting piece (614), the valve needle body (612) is used for opening and closing the first valve port (41), the sealing gasket (613) and the limiting piece (614) are arranged in a cavity of the valve needle body (612), the sealing gasket (613) has the second valve port (611), the limiting piece (614) is fixedly connected with the valve needle body (612) and limits the sealing gasket (613), and the sound attenuation assembly is fixedly connected with the valve needle body (612) or the limiting piece (614).

26. The electronic expansion valve of claim 25, wherein, The sound attenuation assembly further comprises a fixing sleeve (70), both ends of the fixing sleeve (70) have openings for fluid to pass through, the first sound attenuation block (10) and the second sound attenuation block (20) are arranged in a cavity of the fixing sleeve (70) at intervals, and one end of the fixing sleeve (70) is in interference fit, welding or riveting with the limiting piece (614).

27. The electronic expansion valve of claim 26, wherein, A supporting ring (30) is arranged between the first sound attenuation block (10) and the second sound attenuation block (20).

28. The electronic expansion valve of claim 26, wherein, The limiting piece (614) is annular, the limiting piece (614) is arranged around the second valve port (611), an inner wall of the limiting piece (614) has an inner annular step (615), an 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 in limiting fit.

Images