Expansion valve
By incorporating a pressure-reducing module into the expansion valve for pre-throttling, the noise problem of the electronic expansion valve at small openings is solved, resulting in lower noise and kinetic energy impact, and improved noise control.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT CO LTD
- Filing Date
- 2026-02-26
- Publication Date
- 2026-07-23
AI Technical Summary
When the refrigerant flows through the valve port at a small opening, the subcooling is relatively large, causing the refrigerant to become a two-phase gas-liquid state or a pure liquid state. This causes noise to be generated by scouring the silencing structure. In addition, the high flow velocity and high kinetic energy of the refrigerant cause abnormal noise by impacting the silencing block.
A pressure-reducing module is installed in the expansion valve. The refrigerant is first throttled and depressurized in the pressure-reducing module to reduce the subcooling and flow rate before passing through the valve port. The proportion of liquid phase of refrigerant is reduced by two throttling operations to alleviate cavitation. The refrigerant flow direction is adjusted under different operating conditions to solve the noise problem.
It effectively reduces the noise generated by the refrigerant flushing the silencer components, reduces the liquid phase ratio and flow rate of the refrigerant at the outlet valve, reduces noise and kinetic energy impact, and improves noise control effect.
Smart Images
Figure CN2026080153_23072026_PF_FP_ABST
Abstract
Description
Expansion valve
[0001] Related application
[0002] The present application claims priority to the Chinese patent application No. 202520100716.2, filed on January 14, 2025, and entitled "Expansion valve", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD
[0003] The present application relates to the technical field of valves, in particular to an expansion valve. BACKGROUND
[0004] An electronic expansion valve is a common throttling element, which is mainly used in a refrigeration system. The electronic expansion valve controls the flow rate and pressure of refrigerant by changing the opening size of the valve port, so as to realize the compression, cooling and evaporation cycle process of the refrigerant.
[0005] During the use of the electronic expansion valve, discontinuous large bubbles are easily generated in the refrigerant before or after throttling at the valve port, which generates noise. In order to reduce the noise of the electronic expansion valve, a porous noise reduction structure is usually arranged in the flow path of the electronic expansion valve in the related structure. Although the noise reduction structure can reduce the noise, when the electronic expansion valve is in a small opening state, the supercooling degree of the refrigerant before flowing into the valve port is large, and the large supercooling degree of the pure liquid refrigerant changes into a gas-liquid two-phase state with a high liquid phase proportion or a small supercooling degree of the pure liquid refrigerant after flowing through the valve port. The pure liquid refrigerant is easy to cavitate and generate noise when washing the porous noise reduction structure. In addition, the flow rate of the refrigerant after throttling at the valve port is high, and the kinetic energy is large. The high-speed refrigerant is easy to generate abnormal sound when washing the noise reduction block. SUMMARY
[0006] Therefore, it is necessary to provide an expansion valve capable of improving the noise reduction effect.
[0007] An expansion valve, the expansion valve comprising a valve body assembly, a pressure reduction module and a noise reduction assembly, the valve body assembly having a valve port, a first side and a second side, the valve port being located between the first side and the second side and communicating the second side with the first side; the pressure reduction module being arranged at the first side, and the flow area of the first side being reduced at the pressure reduction module; the noise reduction assembly being arranged at the second side; the expansion valve having a first working condition, and when the expansion valve is in the first working condition, the working medium flows from the first side to the second side, and sequentially flows through the pressure reduction module, the valve port and the noise reduction assembly.
[0008] In one of the embodiments, the valve body assembly comprises a main valve body, a first connecting pipe and a second connecting pipe, the valve port being arranged at the main valve body, and the main valve body further comprising a first interface section and a second interface section which respectively communicate with the valve port; the first connecting pipe being connected with the first interface section to form the first side, and the second connecting pipe being connected with the second interface section to form the second side.
[0009] In one embodiment, the first interface segment is disposed at one end of the main valve body along its own axial direction, and the second interface segment is disposed on the side wall of the main valve body; or, the first interface segment is disposed on the side wall of the main valve body, and the second interface segment is disposed at one end of the main valve body along its own axial direction.
[0010] In one embodiment, the pressure reduction module is located at the first connector, or at the first interface segment, or at the connection between the first connector and the first interface segment; and the pressure reduction module has a through hole extending along its own axial direction, and at least part of the through hole has a flow cross-sectional area smaller than the flow cross-sectional area of the first side.
[0011] In one embodiment, the through hole includes a first flow channel that extends along the axial direction of the step-down module at a constant diameter and passes through both ends of the step-down module; or, the through hole includes a first flow channel and at least one flared opening that are connected to each other, the first flow channel extending along the axial direction of the step-down module at a constant diameter, and at least one flared opening located at the end of the first flow channel.
[0012] In one embodiment, the minimum flow cross-sectional area of the through hole is defined as S1, and the flow cross-sectional area of the valve port is defined as S2, where 0.8S2≤S1≤2S2.
[0013] In one embodiment, the extension length of the through hole is defined as L1, and the inner diameter of the valve port is defined as D, where 0.5D≤L1≤6D.
[0014] In one embodiment, the number of through holes is configured to be one or more. When the number of through holes is configured to be more than one, the through holes are spaced apart on the step-down module.
[0015] In one embodiment, a first connector is inserted into a first interface segment, the first interface segment having a limiting surface facing the first connector and spaced apart from the first connector; the step-down module is provided with a limiting ring that protrudes outward along its own radial direction, the limiting ring being clamped between the end face of the first connector and the limiting surface along its own axial direction.
[0016] In one embodiment, the step-down module is configured as a capillary, and the inner diameter of the capillary is defined as d, the inner diameter of the valve port is defined as D, and 0.8D≤d≤1.5D; and / or, the extension length of the capillary is defined as L2, the inner diameter of the valve port is defined as D, and D≤L2≤100D.
[0017] In one embodiment, the step-down module is configured as a first capillary tube; the first capillary tube is disposed at the first connector and is fixedly connected to the first interface segment; or, the first connector includes a first assembly, the first capillary tube is fixedly connected to the first interface segment through the first assembly, and the flow cross-sectional area of the first capillary tube is smaller than the flow cross-sectional area of the first assembly, the first capillary tube and the first assembly are an integral structure, or, the first capillary tube and the first assembly are separate structures, and the two are fixedly connected.
[0018] In one embodiment, the first connector further includes a second assembly connected to the end of the first connector away from the first interface segment, and the flow cross-sectional area of the first capillary is smaller than the flow cross-sectional area of the second assembly. The first capillary and the second assembly are an integral structure, or the first capillary and the second assembly are separate structures, which are fixedly connected.
[0019] In one embodiment, the step-down module is configured as a second capillary connected to the end of the first connector away from the first interface segment; at least a portion of the flow cross-sectional area of the second capillary is smaller than the flow cross-sectional area of the first connector.
[0020] In one embodiment, the expansion valve further includes a connecting pipe, which includes a large-diameter section, a small-diameter section, and a tapered transition section connecting the large-diameter section and the small-diameter section; the small-diameter section is sleeved and connected to the second capillary tube, and the large-diameter section is sleeved and connected to the end of the first connecting pipe away from the first interface section.
[0021] In one embodiment, the silencing component is disposed within the second connector, or within the second interface segment, or at the connection between the second connector and the second interface segment.
[0022] In one embodiment, the noise reduction assembly includes at least one noise reduction block, which is configured as a porous structure.
[0023] In one embodiment, the silencing assembly further includes a bracket, and at least one silencing block is mounted on the second side via the bracket.
[0024] In one embodiment, the silencing assembly includes a plurality of silencing blocks, which are spaced apart along the flow direction of the working medium.
[0025] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description
[0026] To better describe and illustrate embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the currently described embodiments and / or examples, or the best mode of these inventions as currently understood.
[0027] Figure 1 is a cross-sectional view of an expansion valve in one embodiment provided in this application.
[0028] Figure 2 is an enlarged schematic diagram of point A in Figure 1.
[0029] Figure 3 is a magnified schematic diagram of point A in Figure 1.
[0030] Figure 4 is an isometric view of the step-down module in one embodiment provided in this application.
[0031] Figure 5 is a cross-sectional view of the expansion valve in one embodiment provided in this application.
[0032] Figure 6 is a cross-sectional view of the expansion valve in one embodiment provided in this application.
[0033] Figure 7 is a side view of the expansion valve in one embodiment provided in this application.
[0034] Figure 8 is a cross-sectional view of the expansion valve shown in Figure 7.
[0035] Figure 9 is a second side view of the expansion valve in Figure 7.
[0036] Figure 10 is a cross-sectional view of the expansion valve shown in Figure 9.
[0037] Reference numerals: 100, Expansion valve; 10, Valve body assembly; 101, Valve port; 102, First side; 103, Second side; 11, Main valve body; 111, First interface section; 111a, Limiting surface; 112, Second interface section; 12, First connecting pipe; 121, First assembly; 122, Second assembly; 13, Second connecting pipe; 20, Pressure reducing module; 201, Through hole; 21, First flow channel; 22, Trumpet mouth; 23, Limiting ring; 24, First capillary tube; 25, Second capillary tube; 30, Silencing assembly; 31, Support; 32, Silencing block; 40, Sleeve; 50, Valve needle assembly; 60, Connecting pipe; 61, Large diameter section; 62, Small diameter section; 63, Conical transition section. Detailed Implementation
[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0039] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.
[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.
[0043] Referring to Figure 1, this application provides an expansion valve 100, which includes a valve body assembly 10, a pressure-reducing module 20, and a silencing assembly 30. The valve body assembly 10 has a valve port 101, a first side 102, and a second side 103. The valve port 101 is located between and connects the first side 102 and the second side 103. The pressure-reducing module 20 is disposed on the first side 102, and the flow cross-sectional area of the first side 102 is reduced at the pressure-reducing module 20. The silencing assembly 30 is disposed on the second side 103. The expansion valve has a first operating condition. In the first operating condition, the system is in heating mode, and when the expansion valve is in the first operating condition, the working medium flows from the first side 102 to the second side 103, and flows sequentially through the pressure-reducing module 20, the valve port 101, and the silencing assembly 30. The working medium can be refrigerant, and the expansion valve 100 includes, but is not limited to, an electronic expansion valve.
[0044] As the expansion valve 100 closes from its large opening, the flow rate of the valve body decreases, and the subcooling of the refrigerant before it flows into the valve port 101 increases. The refrigerant is in a highly subcooled pure liquid state. After passing through the valve port 101, the highly subcooled pure liquid refrigerant becomes a high-speed, liquid-to-gas two-phase state or a slightly subcooled pure liquid state. The higher the liquid phase ratio in the refrigerant, the easier it is for cavitation to occur when the refrigerant flows through the silencing component 30, thus generating noise. Furthermore, the higher the subcooling of the refrigerant before it flows into the valve port 101, the higher the liquid phase ratio in the refrigerant after it flows out of the valve port 101, and the easier it is for cavitation to occur. Cavitation refers to the phenomenon where, due to a pressure drop below the liquid's saturated vapor pressure, bubbles form inside the liquid. These bubbles collapse rapidly when the pressure recovers, releasing enormous energy and creating high temperature, high pressure, and strong shock waves.
[0045] The expansion valve 100 provided in this application, by setting a pressure-reducing module 20 on the first side 102 and reducing the flow cross-sectional area of the first side 102 at the pressure-reducing module 20, ensures that when the expansion valve 100 is in its first operating condition, the refrigerant undergoes a first throttling and pressure reduction in the pressure-reducing module 20 before flowing through the valve port 101. Specifically, when the expansion valve 100 is in a small opening state, the refrigerant first undergoes throttling through the pressure-reducing module 20, changing from a highly subcooled pure liquid state to a slightly subcooled pure liquid state or a gas-liquid two-phase state; then the refrigerant undergoes a second throttling at the valve port 101, changing from a slightly subcooled pure liquid state to a gas-liquid two-phase state, or the gas-liquid two-phase refrigerant increases the proportion of gaseous refrigerant after throttling through the valve port 101. Thus, after two throttling processes by the pressure-reducing module 20 and the valve port 101, the proportion of liquid phase in the refrigerant flowing out of the valve port 101 can be reduced, thereby alleviating the cavitation phenomenon caused by the refrigerant scouring the silencer assembly 30. Furthermore, the greater the pressure difference before and after the refrigerant flows through the valve port 101, the greater the refrigerant flow velocity when flowing out of the valve port 101. By first throttling and reducing the pressure of the refrigerant flowing into the valve port 101 through the pressure reduction module 20, the pressure difference before and after the refrigerant flows through the valve port 101 can be reduced, thereby reducing the refrigerant flow velocity when flowing out of the valve port 101. This reduces the kinetic energy of the refrigerant, weakens the impact on the silencing component 30, and helps to reduce noise.
[0046] Furthermore, the expansion valve 100 is configured as a two-way valve and also has a second operating condition. In the second operating condition, the system is in cooling mode. When the expansion valve 100 is in the second operating condition, the refrigerant flows from the second side 103 to the first side 102, and flows sequentially through the silencer assembly 30, the valve port 101, and the pressure reduction module 20. During the actual operation of the expansion valve, when the system has just started, or when there is a shortage of refrigerant, or when the system lacks an economizer or the outdoor unit heat exchanger area is insufficient, the refrigerant may experience insufficient subcooling before flowing through the valve port. Thus, when the expansion valve 100 switches to the second operating condition, before the refrigerant flows through the valve port 101, if the refrigerant entering from the second side 103 has insufficient subcooling, bubbles are easily generated in the refrigerant. At this time, the refrigerant can first flow through the silencer assembly 30, and the noise is reduced by the silencer assembly 30.
[0047] Therefore, the expansion valve 100 provided in this application, by setting the pressure-reducing module 20 on the first side 102 and the silencing component 30 on the second side 103, when the expansion valve 100 is in the first operating condition, the refrigerant enters from the first side 102 and exits from the second side 103, specifically flowing through the pressure-reducing module 20, the valve port 101 and the silencing component 30 in sequence, thereby solving the noise problem caused by the high subcooling of the refrigerant on the first side 102 when the expansion valve 100 is at a small opening; when the expansion valve 100 switches to the second operating condition, the refrigerant switches to entering from the second side 103 and exiting from the first side 102, specifically flowing through the silencing component 30, the valve port 101 and the pressure-reducing module 20 in sequence, thereby solving the noise problem caused by the insufficient subcooling of the refrigerant entering from the second side 103.
[0048] The valve body assembly 10 includes a main valve body 11, a first connecting pipe 12, and a second connecting pipe 13. A valve port 101 is disposed on the main valve body 11. Specifically, the valve port 101 can be located on the main valve body 11, or the valve port 101 can be separately disposed from and fixedly connected to the main valve body 11. The main valve body 11 also includes a first interface section 111 and a second interface section 112 respectively communicating with the valve port 101. The first connecting pipe 12 is connected to the first interface section 111 to form a first side 102, and the second connecting pipe 13 is connected to the second interface section 112 to form a second side 103. The expansion valve 100 also includes a sleeve 40, which is connected to one end of the main valve body 11 along its axial direction.
[0049] For example, according to the access direction of the expansion valve 100 and the needs of the system, as shown in FIG1, the first interface section 111 is disposed on the side wall of the main valve body 11, and the second interface section 112 is disposed at the end of the main valve body 11 away from the sleeve 40 along its own axial direction. That is, the first side 102 is located on the side of the main valve body 11, and the second side 103 is located at the end of the main valve body 11 away from the sleeve 40 along its axial direction.
[0050] Alternatively, as shown in Figure 6, depending on the connection direction of the expansion valve 100 and the needs of the system, the first interface section 111 can be located at the end of the main valve body 11 away from the sleeve 40 along its own axial direction, and the second interface section 112 can be located on the side wall of the main valve body 11. That is, the first side 102 is located at the end of the main valve body 11 away from the sleeve 40 along its axial direction, and the second side 103 is located on the side of the main valve body 11.
[0051] As shown in Figure 1, the silencing component 30 is disposed within the second connecting pipe 13. Specifically, it can be integrally disposed with the second connecting pipe 13, or it can be disposed separately and fixedly connected. Alternatively, the silencing component 30 is disposed within the second interface section 112. Specifically, it can be integrally disposed with the second connecting pipe 13, or it can be disposed separately and fixedly connected. The silencing component 30 can also be disposed at the connection between the second connecting pipe 13 and the second interface section 112.
[0052] The noise reduction assembly 30 includes at least one noise reduction block 32, which is configured as a porous structure.
[0053] For example, the silencing block 32 is configured as a filter sintered block, and there are multiple silencing blocks 32, which are distributed at intervals along the refrigerant flow direction. It should be noted that multiple silencing blocks 32 means that the number of silencing blocks 32 is two or more.
[0054] The noise reduction assembly 30 may also include a bracket 31, through which the noise reduction blocks 32 are mounted on the second side 103. Specifically, the number of noise reduction blocks 32 may be configured to be two, and the two noise reduction blocks 32 are respectively mounted on both ends of the bracket 31.
[0055] As shown in Figure 1, the expansion valve 100 also includes a valve needle assembly 50. The sleeve 40 and the main valve body 11 surround and form a working space. The valve needle assembly 50 is movably installed in the working space and can extend into the valve port 101 to adjust the opening size of the valve port 101.
[0056] The following describes various arrangement configurations of the step-down module 20.
[0057] Example 1
[0058] Please refer to Figures 1 to 4. The step-down module 20 is located at the first connecting pipe 12, specifically configured to be integrally formed with the first connecting pipe 12 or separately. Alternatively, the step-down module 20 is located at the first interface section 111, specifically configured to be integrally formed with the first interface section 111 or separately. Alternatively, the step-down module 20 is located at the connection between the first connecting pipe 12 and the first interface section 111. Furthermore, the step-down module 20 has a through hole 201 extending along its own axial direction, and at least a portion of the through hole 201 has a flow cross-sectional area smaller than the flow cross-sectional area of the first side 102.
[0059] For example, as shown in FIG2, the through hole 201 includes a first through channel 21, which extends along the axial direction of the step-down module 20 with equal diameter and passes through both ends of the step-down module 20.
[0060] Alternatively, in another embodiment, as shown in FIG3, the through hole 201 includes a first through channel 21 and at least one flared opening 22 connected to each other. The first through channel 21 extends along the axial direction of the step-down module 20 with a constant diameter, and the at least one flared opening 22 is located at the end of the first through channel 21. The flared opening 22 expands outward relative to the step-down module 20.
[0061] The minimum flow cross-sectional area of the through-hole 201 is defined as S1, and the flow cross-sectional area of the valve port 101 is defined as S2, where 0.8S2≤S1≤2S2. The refrigerant is throttled at the minimum flow cross-sectional area of the through-hole 201. It is understandable that if S1 is too small, the refrigerant flow through the first passage 21 will be too small; if S1 is too large, it will be difficult to achieve a throttling effect on the refrigerant. Therefore, setting 0.8S2≤S1≤2S2 ensures that the first passage 21 has a throttling effect on the refrigerant while avoiding an excessively small refrigerant flow through it. For example, S1 could be 0.8S2, S1 = S2, S1 = 1.5S2, or S1 = 2S2.
[0062] The extension length of the through hole 201 is defined as L1, and the inner diameter of the valve port 101 is defined as D, where 0.5D≤L1≤6D. It is understandable that since the through hole 201 extends through both ends of the pressure-reducing module 20 along its axial direction, a small extension length L1, meaning a small axial extension length of the pressure-reducing module 20, will affect its structural strength. An excessively large L1 will increase the processing difficulty of the first flow channel 211. Therefore, by setting 0.5D≤L1≤6D, the structural strength of the pressure-reducing module 20 is ensured while facilitating the processing of the first flow channel 21. For example, L1 could be 0.5D, L1 = D, L1 = 1.5D, L1 = 5D, or even L1 = 6D.
[0063] For example, the number of through holes 201 is configured to be one, and the one through hole 201 is located on the axis of the buck module 20. Alternatively, the number of through holes 201 can also be configured to be multiple, and the multiple through holes 201 are distributed at intervals on the buck module 20. Specifically, they can be evenly distributed around the axis of the buck module 20.
[0064] As shown in Figures 1 and 2, the first connector 12 is inserted into the first interface segment 111. The first interface segment 111 has a limiting surface 111a that faces the first connector 12 and is spaced apart from the first connector 12. The step-down module 20 is provided with a limiting ring 23 that protrudes outward along its own radial direction. The limiting ring 23 is sandwiched between the end face of the first connector 12 and the limiting surface 111a along its own axial direction.
[0065] This facilitates the assembly and fixation of the first connecting pipe 12, the first interface section 111, and the step-down module 20. Specifically, when assembling the first connecting pipe 12, the first interface section 111, and the step-down module 20, the step-down module 20 can be first inserted into the first interface section 111, with one side of the limiting ring 23 abutting against the limiting surface 111a; then, the first connecting pipe 12 is inserted into the first interface section 111, with the end face of the first connecting pipe 12 abutting against the other side of the limiting ring 23. The two sides of the limiting ring 23 can be welded and fixed to the end face of the first connecting pipe 12 and the limiting ring 23, respectively. Further, the limiting ring 23 is located at the end of the step-down module 20 near the valve port 101.
[0066] Please refer to Figures 5 to 10. The pressure-reducing module 20 can also be configured as a capillary tube, with the inner diameter of the capillary tube defined as d and the inner diameter of the valve port 101 defined as D, where 0.8D≤d≤1.5D. It is understandable that if d is too small, it will affect the refrigerant flow rate into the expansion valve 100; if d is too large, the capillary tube may have difficulty throttling the refrigerant. Therefore, by setting 0.8D≤d≤1.5D, the refrigerant flow rate into the expansion valve 100 can be avoided while ensuring that the refrigerant has a throttling effect.
[0067] The capillary extension length is defined as L2, and the inner diameter of the valve port 101 is defined as D, where D≤L2≤100D. The capillary can be configured in two ways.
[0068] Example 2
[0069] Please refer to Figures 5 and 6. The step-down module 20 is configured as a first capillary tube 24. The first capillary tube 24 is located at the first connector 12 and is fixedly connected to the first interface segment 111. At this time, the first capillary tube 24 is configured as a part of the first connector 12.
[0070] Alternatively, the first connector 12 includes a first assembly 121, the first capillary 24 is fixedly connected to the first interface segment 111 through the first assembly 121, and the flow cross-sectional area of the first capillary 24 is smaller than the flow cross-sectional area of the first assembly 121. The first capillary 24 and the first assembly 121 are an integral structure, or the first capillary 24 and the first assembly 121 are separate structures, which are fixedly connected.
[0071] Furthermore, the first connector 12 also includes a second assembly 122, which is connected to the end of the first connector 12 away from the first interface segment 111. The flow cross-sectional area of the first capillary 24 is smaller than the flow cross-sectional area of the second assembly 122. The first capillary 24 and the second assembly 122 are either an integral structure or separate structures, but are fixedly connected.
[0072] The first capillary tube 24 can be configured as a stainless steel tube, and the first kit 121 and the second kit 122 are both copper tubes. The first kit 121 and the second kit 122 are respectively sleeved on the outer periphery of the first capillary tube 24 and welded to the first capillary tube 24 for fixation.
[0073] In one embodiment, as shown in FIG5, a first interface segment 111 is disposed on the side wall of the main valve body 11, and a first capillary tube 24 is connected to the first interface segment 111 through a first assembly 121. That is, the first capillary tube 24 is connected to the side wall of the main valve body 11.
[0074] In another embodiment, as shown in FIG6, the first interface segment 111 is disposed at the end of the main valve body 11 away from the sleeve 40 along its own axial direction, and the first capillary 24 is connected to the first interface segment 111 through the first fitting 121. That is, the first capillary 24 is connected to the end of the main valve body 11 away from the sleeve 40 along its own axial direction.
[0075] Example 3
[0076] Please refer to Figures 7 to 10. The step-down module 20 is configured as a second capillary 25, which is connected to the end of the first connector 12 away from the first interface segment 111. At least part of the flow cross-sectional area of the second capillary 25 is smaller than the flow cross-sectional area of the first connector 12.
[0077] Furthermore, the expansion valve also includes a connecting pipe 60, which includes a large-diameter section 61, a small-diameter section 62, and a tapered transition section 63 connecting the large-diameter section 61 and the small-diameter section 62; the small-diameter section 62 is sleeved and connected to the second capillary tube 25, and the large-diameter section 61 is sleeved and connected to the end of the first connecting pipe 12 away from the first interface section 111.
[0078] The large-diameter section 61, the small-diameter section 62, and the tapered transition section 63 are configured as an integral structure. The small-diameter section 62 is sleeved on the outside of the second capillary tube 25 and is fixedly connected to the second capillary tube 25. The large-diameter section 61 is sleeved on the end of the first connector 12 away from the first interface section 111 and is fixedly connected to the first connector 12.
[0079] Furthermore, a filter is provided at the end of the second capillary 25 away from the connecting tube 60, or the filter may be provided at the connection between the connecting tube 60 and the second capillary 25.
[0080] In one embodiment, as shown in Figures 7 and 8, a first interface segment 111 is disposed on the side wall of the main valve body 11, a first connecting pipe 12 is connected to the first interface segment 111, and a second capillary tube 25 is connected to the end of the first connecting pipe 12 away from the first interface segment 111. That is, the second capillary tube 25 is connected to the side wall of the main valve body 11 through the first connecting pipe 12.
[0081] In another embodiment, as shown in Figures 9 and 10, a first interface segment 111 is disposed at the end of the main valve body 11 away from the sleeve 40 along its own axial direction. A first connecting pipe 12 is connected to the first interface segment 111, and a second capillary tube 25 is connected to the end of the first connecting pipe 12 away from the first interface segment 111. That is, the second capillary tube 25 is connected to the end of the main valve body 11 away from the sleeve 40 through the first connecting pipe 12.
[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0083] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. An expansion valve, characterized in that, The expansion valve includes a valve body assembly, a pressure reducing module, and a silencing assembly. The valve body assembly has a valve port, a first side, and a second side. The valve port is located between the first side and the second side and communicates with the first side and the second side. The step-down module is disposed on the first side, and the flow cross-sectional area of the first side at the step-down module is reduced; the noise reduction component is disposed on the second side. The expansion valve has a first operating condition, and when the expansion valve is in the first operating condition, the working medium flows from the first side to the second side, and flows sequentially through the pressure reduction module, the valve port and the silencer assembly.
2. The expansion valve according to claim 1, wherein, The valve body assembly includes a main valve body, a first connecting pipe and a second connecting pipe, and the valve port is disposed on the main valve body. The main valve body also includes a first interface section and a second interface section respectively connected to the valve port. The first connector is connected to the first interface segment to form the first side, and the second connector is connected to the second interface segment to form the second side.
3. The expansion valve according to claim 2, wherein, The first interface segment is disposed at one end of the main valve body along its own axial direction, and the second interface segment is disposed on the side wall of the main valve body; Alternatively, the first interface segment may be disposed on the side wall of the main valve body, and the second interface segment may be disposed at one end of the main valve body along its own axial direction.
4. The expansion valve according to claim 2 or 3, wherein, The step-down module is located at the first connector, or at the first interface segment, or at the connection between the first connector and the first interface segment; Furthermore, along the axial direction of the step-down module, the step-down module has a through hole extending along its own axial direction, and at least a portion of the through hole has a flow cross-sectional area smaller than that of the first side.
5. The expansion valve according to claim 4, wherein, The through hole includes a first flow channel, which extends along the axial direction of the step-down module at a constant diameter and passes through both ends of the step-down module; Alternatively, the through hole includes a first through channel and at least one flared opening, the first through channel extending at the same diameter along the axial direction of the step-down module, and at least one flared opening located at the end of the first through channel.
6. The expansion valve according to claim 4, wherein, The minimum flow cross-sectional area of the through hole is defined as S1, and the flow cross-sectional area of the valve port is defined as S2, where 0.8S2≤S1≤2S2.
7. The expansion valve according to claim 4, wherein, The extension length of the through hole is defined as L1, and the inner diameter of the valve port is defined as D, where 0.5D≤L1≤6D.
8. The expansion valve according to claim 4, wherein, The number of through holes can be configured as one or more. When the number of through holes is configured as multiple, the multiple through holes are distributed at intervals on the step-down module.
9. The expansion valve according to claim 4, wherein, The first connector is inserted into the first interface segment, and the first interface segment has a limiting surface that faces the first connector and is spaced apart from the first connector. The step-down module is provided with a limiting ring that protrudes outward along its own radial direction, and the limiting ring is clamped between the end face of the first pipe and the limiting surface along its own axial direction.
10. The expansion valve according to claim 2 or 3, wherein, The pressure reduction module is configured as a capillary tube, and the inner diameter of the capillary tube is defined as d, and the inner diameter of the valve port is defined as D, where 0.8D≤d≤1.5D; And / or, the extension length of the capillary is defined as L2, the inner diameter of the valve port is defined as D, and D≤L2≤100D.
11. The expansion valve according to claim 10, wherein, The step-down module is configured as a first capillary tube; The first capillary tube is disposed at the first connector, and the first capillary tube is fixedly connected to the first interface segment; Alternatively, the first connector may include a first assembly, the first capillary may be fixedly connected to the first interface segment via the first assembly, and the flow cross-sectional area of the first capillary may be smaller than the flow cross-sectional area of the first assembly. The first capillary and the first assembly may be an integral structure, or the first capillary and the first assembly may be separate structures, which may be fixedly connected.
12. The expansion valve according to claim 11, wherein, The first connector further includes a second assembly, which is connected to the end of the first connector away from the first interface segment. The flow cross-sectional area of the first capillary is smaller than that of the second assembly. The first capillary and the second assembly are an integral structure, or the first capillary and the second assembly are separate structures that are fixedly connected.
13. The expansion valve according to claim 10, wherein, The step-down module is configured as a second capillary tube, which is connected to the end of the first connector that is away from the first interface segment. At least a portion of the flow cross-sectional area of the second capillary is smaller than the flow cross-sectional area of the first connecting tube.
14. The expansion valve according to claim 13, wherein, The expansion valve further includes a connecting pipe, which includes a large-diameter section, a small-diameter section, and a tapered transition section connecting the large-diameter section and the small-diameter section; The smaller diameter section is sleeved and connected to the second capillary tube, and the larger diameter section is sleeved and connected to the end of the first connector that is furthest from the first interface section.
15. The expansion valve according to claim 2, wherein, The silencing component is disposed within the second connecting pipe, or within the second interface segment, or at the connection between the second connecting pipe and the second interface segment.
16. The expansion valve according to claim 1, wherein, The noise reduction assembly includes at least one noise reduction block, and at least one of the noise reduction blocks is configured as a porous structure.
17. The expansion valve according to claim 16, wherein, The silencing assembly also includes a bracket, and at least one of the silencing blocks is mounted on the second side via the bracket.
18. The expansion valve according to claim 16, wherein, The silencing assembly includes multiple silencing blocks, which are spaced apart along the flow direction of the working medium.