Expansion valve

Abstract

The expansion valve comprises a valve body assembly, a pressure reduction module and a noise reduction assembly, the valve body assembly is provided with a valve port, a first side and a second side, and the valve port is located between the first side and the second side and communicates with the first side and the second side; the pressure reduction module is arranged on the first side, the circulation sectional area of the first side at the pressure reduction module is reduced, and the silencing assembly is arranged on the second side; the expansion valve has 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 silencing assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to an expansion valve. BACKGROUND

[0002] An electronic expansion valve is a common throttling element, which is mainly used in a refrigeration system to control the flow and pressure of refrigerant by changing the opening size of the valve port of the electronic expansion valve, so as to realize the compression, cooling and evaporation cycle process of the refrigerant.

[0003] 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. Moreover, 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. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide an expansion valve capable of improving the noise reduction effect.

[0005] An expansion valve, which comprises a valve body assembly, a pressure reduction module and a noise reduction 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 the second side with the first side. The pressure reduction module is arranged at the first side, and the flow area of the first side is reduced at the pressure reduction module. The noise reduction assembly is arranged at the second side. The expansion valve has a first working condition. 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.

[0006] 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 is arranged on the main valve body, and the main valve body further comprises a first interface section and a second interface section which respectively communicate with the valve port. The first connecting pipe is connected with the first interface section to form the first side, and the second connecting pipe is connected with the second interface section to form the second side.

[0007] In one of the embodiments, the first interface section is arranged at one end of the main valve body along the axial direction of the main valve body, and the second interface section is arranged on the side wall of the main valve body. Alternatively, the first interface section is arranged on the side wall of the main valve body, and the second interface section is arranged at one end of the main valve body along the axial direction of the main valve body.

[0008] In one of the embodiments, the pressure reduction module is located at the first connector, or at the first interface section, or at the connection between the first connector and the first interface section; and the pressure reduction module has a through hole penetrating along the axial direction of the pressure reduction module, and the flow cross-sectional area of at least part of the through hole is smaller than the flow cross-sectional area of the first side.

[0009] In one of the embodiments, the through hole comprises a first through flow channel extending along the axial direction of the pressure reduction module at a constant diameter and penetrating through both ends of the pressure reduction module; or the through hole comprises a first through flow channel and at least one horn connected in communication, the first through flow channel extends along the axial direction of the pressure reduction module at a constant diameter, and the at least one horn is located at the end of the first through flow channel.

[0010] In one of the embodiments, the minimum flow cross-sectional area of the through hole is S1, and the flow cross-sectional area of the valve port is S2, and 0.8S2≤S1≤2S2.

[0011] In one of the embodiments, the extension length of the through hole is L1, and the inner diameter of the valve port is D, and 0.5D≤L1≤6D.

[0012] In one of the embodiments, the number of through holes is configured to be one or more, and when the number of through holes is configured to be more than one, the plurality of through holes are distributed at intervals on the pressure reduction module.

[0013] In one of the embodiments, the first connector is inserted into the first interface section, and the first interface section has a limiting surface arranged towards the first connector and spaced apart from the first connector; the pressure reduction module is provided with a limiting ring protruding radially outward along the pressure reduction module, and the limiting ring is clamped between the end surface of the first connector and the limiting surface along the axial direction of the limiting ring.

[0014] In one of the embodiments, the pressure reduction module is configured as a capillary tube, and the inner diameter of the capillary tube is d, and the inner diameter of the valve port is D, and 0.8D≤d≤1.5D; and / or, the extension length of the capillary tube is L2, the inner diameter of the valve port is D, and D≤L2≤100D.

[0015] In one of the embodiments, the pressure reduction module is configured as a first capillary tube; the first capillary tube is arranged at the first connector, and the first capillary tube is fixedly connected with the first interface section; or the first connector comprises a first sleeve, the first capillary tube is fixedly connected with the first interface section through the first sleeve, and the flow cross-sectional area of the first capillary tube is smaller than the flow cross-sectional area of the first sleeve, the first capillary tube and the first sleeve are an integral structure, or the first capillary tube and the first sleeve are a split structure and are fixedly connected.

[0016] In one of the embodiments, the first connector further comprises a second sleeve, the second sleeve is connected to the end of the first connector away from the first interface section, and the flow cross-sectional area of the first capillary is smaller than the flow cross-sectional area of the second sleeve, the first capillary and the second sleeve are in an integrated structure, or the first capillary and the second sleeve are in a separate structure and are fixedly connected.

[0017] In one of the embodiments, the pressure reduction module is configured as a second capillary, the second capillary is connected to the end of the first connector away from the first interface section, and at least part of the flow cross-sectional area of the second capillary is smaller than the flow cross-sectional area of the first connector.

[0018] In one of the embodiments, the expansion valve further comprises a connecting pipe, the connecting pipe comprises 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 with the second capillary, and the large-diameter section is sleeved with the end of the first connector away from the first interface section.

[0019] In one of the embodiments, the sound attenuation assembly is arranged in the second connector, or arranged in the second interface section, or arranged at the connection between the second connector and the second interface section.

[0020] In one of the embodiments, the sound attenuation assembly comprises at least one sound attenuation block, and the at least one sound attenuation block is configured as a porous structure.

[0021] In one of the embodiments, the sound attenuation assembly further comprises a support, and the at least one sound attenuation block is mounted to the second side through the support.

[0022] In one of the embodiments, the sound attenuation assembly comprises a plurality of sound attenuation blocks, and the plurality of sound attenuation blocks are arranged at intervals along the flow direction of the working medium.

[0023] Compared with the prior art, the expansion valve provided by the application is provided with a pressure reduction module at the first side, and the flow area of the first side at the pressure reduction module is reduced, so that when the expansion valve is in the first working condition, the refrigerant is throttled and reduced in pressure by the pressure reduction module before flowing through the valve port. Specifically, when the expansion valve is in a small opening state, the refrigerant is throttled by the pressure reduction module first, and changes from a large supercooling degree pure liquid state to a small supercooling degree pure liquid state or a gas-liquid two-phase state; then the refrigerant is throttled for the second time at the valve port, and changes from a small supercooling degree pure liquid state to a gas-liquid two-phase state, or the proportion of the gas phase refrigerant is increased after the gas-liquid two-phase state refrigerant is throttled at the valve port. In this way, the liquid phase proportion in the refrigerant flowing out of the valve port can be reduced through the two throttling of the pressure reduction module and the valve port, so that the cavitation phenomenon caused by the refrigerant washing the sound attenuation assembly can be alleviated. In addition, the greater the pressure difference before and after the refrigerant flows through the valve port, the greater the flow rate of the refrigerant flowing out of the valve port, and the refrigerant flowing into the valve port is throttled and reduced in pressure by the pressure reduction module first, so that the pressure difference before and after the refrigerant flows through the valve port can be reduced, thereby reducing the flow rate of the refrigerant flowing out of the valve port, so that the kinetic energy of the refrigerant can be reduced, the impact on the sound attenuation assembly can be weakened, and the noise can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 A cross-sectional view of the expansion valve in Embodiment One provided by the present application;

[0026] Figure 2 A cross-sectional view of the expansion valve in Embodiment One provided by the present application; Figure 1 An enlarged schematic view of A of FIG. 1; Figure 1 ; An enlarged schematic view of A of FIG. 2;

[0027] Figure 3 An enlarged schematic view of A of FIG. 3; Figure 1 An enlarged schematic view of A of FIG. 4; Figure 2 ; An axonometric view of the pressure reduction module in one of the embodiments provided by the present application;

[0028] Figure 4 A cross-sectional view of the expansion valve in Embodiment Two provided by the present application;

[0029] Figure 5 A cross-sectional view of the expansion valve in Embodiment Two provided by the present application; Figure 1 ; A cross-sectional view of the expansion valve in Embodiment Two provided by the present application;

[0030] Figure 6 A cross-sectional view of the expansion valve in Embodiment Two provided by the present application; Figure 2 ; A cross-sectional view of the expansion valve in Embodiment Two provided by the present application;

[0031] Figure 7A side view of the expansion valve provided in Example Three of the present application Figure 1 ;

[0032] Figure 8 A cross-sectional view of the expansion valve provided in Example Three of the present application Figure 7

[0033] Figure 9 A side view of the expansion valve provided in Example Three of the present application Figure 2 ;

[0034] Figure 10 A cross-sectional view of the expansion valve provided in Example Three of the present application Figure 9

[0035] 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 sleeve; 122, second sleeve; 13, second connecting pipe; 20, pressure reduction module; 201, through hole; 21, first through flow channel; 22, flared port; 23, limiting ring; 24, first capillary tube; 25, second capillary tube; 30, sound damping assembly; 31, bracket; 32, sound damping block; 40, sleeve; 50, valve needle assembly; 60, connecting pipe; 61, large diameter section; 62, small diameter section; 63, tapered transition section. DETAILED DESCRIPTION

[0036] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details. In other instances, well-known process steps have not been described in detail in order to avoid obscuring the present application.

[0037] It should be noted that when an element is referred to as being "on" or "fixed to" another element, it can be directly on or fixed to the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions as used herein are for the purpose of illustration only and do not indicate the only orientation of the present application.

[0038] ​​In addition, the terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply relative importance or a quantity of the indicated elements. Thus, a feature defined with "first", "second", etc. can include at least one of the features, explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically defined.

[0039] In the present application, unless otherwise explicitly and specifically defined, "on", "under", "above", and "over" of a first feature to a second feature can mean that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "on", "above", and "over" of a first feature to a second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. "Under", "below", and "underneath" of a first feature to a second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0040] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0041] Please refer to Figure 1 The present application provides an expansion valve 100, which comprises a valve body assembly 10, a pressure reduction module 20, and a sound attenuation 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 the first side 102 and the second side 103 and communicates the first side 102 and the second side 103. The pressure reduction module 20 is arranged on the first side 102, and the flow area of the first side 102 is reduced at the pressure reduction module 20. The sound attenuation assembly 30 is arranged on the second side 103. The expansion valve has a first working condition. In the first working condition, the system is in a heating mode. When the expansion valve is in the first working condition, the working medium flows from the first side 102 to the second side 103, and sequentially flows through the pressure reduction module 20, the valve port 101, and the sound attenuation assembly 30. The working medium can be refrigerant, and the expansion valve 100 includes but is not limited to an electronic expansion valve.

[0042] When the expansion valve 100 is closed at a large opening degree, the flow rate of the valve body is reduced, the supercooling degree of the refrigerant before flowing into the valve port 101 is increased, the refrigerant is in a high supercooling degree pure liquid state, and the refrigerant in the high supercooling degree pure liquid state becomes a gas-liquid two-phase state with a high proportion of liquid phase or a small supercooling degree pure liquid state after passing through the valve port 101. The higher the proportion of liquid phase in the refrigerant, the more likely cavitation occurs when the refrigerant flushes the silencing assembly 30, thereby generating noise. In addition, the higher the supercooling degree of the refrigerant before flowing into the valve port 101, the higher the proportion of liquid phase in the refrigerant after flowing out of the valve port 101, and the more likely cavitation occurs. Cavitation refers to the formation of bubbles in a liquid due to a decrease in pressure below the saturated vapor pressure of the liquid, and the rapid collapse of these bubbles when the pressure is restored, releasing a large amount of energy, forming a high temperature, high pressure and strong shock wave.

[0043] The expansion valve 100 provided by the present application reduces the proportion of liquid phase in the refrigerant flowing out of the valve port 101 by setting the pressure reduction module 20 at the first side 102 and reducing the flow area at the pressure reduction module 20, so that when the expansion valve 100 is in the first working condition, the refrigerant is throttled and reduced in pressure by the pressure reduction module 20 before flowing through the valve port 101. Specifically, when the expansion valve 100 is in a small opening degree state, the refrigerant first passes through the pressure reduction module 20 to be throttled from a large supercooling degree pure liquid state to a small supercooling degree pure liquid state or a gas-liquid two-phase state; then the refrigerant is throttled again at the valve port 101 from a small supercooling degree pure liquid state to a gas-liquid two-phase state, or the proportion of gas phase refrigerant is increased after the gas-liquid two-phase state refrigerant is throttled at the valve port 101. In this way, the two throttling processes of the pressure reduction module 20 and the valve port 101 can reduce the proportion of liquid phase in the refrigerant flowing out of the valve port 101, thereby alleviating the cavitation phenomenon caused by the refrigerant flushing the silencing assembly 30. In addition, the greater the pressure difference before and after the refrigerant flows through the valve port 101, the greater the flow rate of the refrigerant flowing out of the valve port 101. By throttling and reducing the pressure of the refrigerant flowing into the valve port 101 by 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 flow rate of the refrigerant flowing out of the valve port 101, thereby reducing the kinetic energy of the refrigerant and weakening the impact on the silencing assembly 30, which is conducive to reducing noise.

[0044] Further, the expansion valve 100 is configured as a bidirectional valve, and the expansion valve 100 further has a second working condition, in the second working condition, the system is in a refrigeration mode, when the expansion valve 100 is in the second working condition, the refrigerant flows from the second side 103 to the first side 102, and sequentially flows through the sound reduction assembly 30, the valve port 101 and the pressure reduction module 20. In the actual operation of the expansion valve, when the system is just started, or the refrigerant is insufficient, or the system lacks an economizer or the area of the outdoor heat exchanger is insufficient, the refrigerant may not be sufficiently subcooled before flowing through the valve port. Therefore, when the expansion valve 100 switches to the second working condition, the refrigerant is insufficiently subcooled before flowing through the valve port 101, and bubbles are easily generated in the refrigerant, at this time, the refrigerant can flow through the sound reduction assembly 30 first, and the noise is reduced by the sound reduction assembly 30.

[0045] Therefore, the expansion valve 100 provided by the present application can solve the noise problem caused by the high subcooling degree of the refrigerant in the first side 102 when the expansion valve 100 is in a small opening degree, and can solve the noise problem caused by the insufficient subcooling degree of the refrigerant entering from the second side 103 when the expansion valve 100 switches to the second working condition.

[0046] The valve body assembly 10 includes a main valve body 11, a first connecting pipe 12 and a second connecting pipe 13, the valve port 101 is arranged on the main valve body 11, specifically, the valve port 101 can be arranged on the main valve body 11, or the valve port 101 is arranged separately from the main valve body 11 and fixedly connected to the main valve body 11. The main valve body 11 further includes a first interface section 111 and a second interface section 112 which are respectively connected to the valve port 101; the first connecting pipe 12 is connected to the first interface section 111 to form the first side 102, and the second connecting pipe 13 is connected to the second interface section 112 to form the second side 103. The expansion valve 100 further includes a sleeve 40, the sleeve 40 is connected to one end of the main valve body 11 along the axial direction of the sleeve 40.

[0047] Optionally, according to the access direction of the expansion valve 100 and the needs of the system, the first interface section 111 is arranged on the side wall of the main valve body 11, and the second interface section 112 is arranged on the end of the main valve body 11 away from the sleeve 40 along the axial direction of the main valve body 11. Figure 1 As shown in FIG. 1, the first interface section 111 is arranged on the side wall of the main valve body 11, and the second interface section 112 is arranged on the end of the main valve body 11 away from the sleeve 40 along the axial direction of the main valve body 11. That is, the first side 102 is located on the side of the main valve body 11, and the second side 103 is located on the end of the main valve body 11 away from the sleeve 40 along the axial direction.

[0048] Alternatively, as shown in FIG. 2, the first interface section 111 is arranged on the end of the main valve body 11 away from the sleeve 40 along the axial direction of the main valve body 11, and the second interface section 112 is arranged on the side wall of the main valve body 11. Figure 6As shown, according to the access direction of the expansion valve 100 and the needs of system use, the first interface section 111 can be arranged at the end of the main valve body 11 away from the sleeve 40 along the axial direction of the main valve body 11, and the second interface section 112 can be arranged at 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 the axial direction, and the second side 103 is located at the side of the main valve body 11.

[0049] As shown in Figure 1 , the sound attenuation assembly 30 is arranged in the second connecting pipe 13, and can be arranged integrally with the second connecting pipe 13 or arranged separately and fixedly connected. Alternatively, the sound attenuation assembly 30 is arranged in the second interface section 112, and can be arranged integrally with the second connecting pipe 13 or arranged separately and fixedly connected. The sound attenuation assembly 30 can also be arranged at the connection between the second connecting pipe 13 and the second interface section 112.

[0050] The sound attenuation assembly 30 comprises at least one sound attenuation block 32, and the at least one sound attenuation block 32 is configured as a porous structure.

[0051] Optionally, in one embodiment, the sound attenuation block 32 is configured as a filter screen sintered block, and the number of sound attenuation blocks 32 is multiple, and the multiple sound attenuation blocks 32 are distributed at intervals along the flow direction of the refrigerant. It should be noted that the multiple sound attenuation blocks 32 refer to the number of sound attenuation blocks 32 being two or more.

[0052] The sound attenuation assembly 30 can further comprise a bracket 31, and the sound attenuation block 32 is installed on the second side 103 through the bracket 31. Specifically, the number of sound attenuation blocks 32 can be configured as two, and the two sound attenuation blocks 32 are respectively installed at the two ends of the bracket 31.

[0053] As shown in Figure 1 , the expansion valve 100 further comprises a valve needle assembly 50, the sleeve 40 and the main valve body 11 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.

[0054] The following describes various arrangement forms of the pressure reduction module 20

[0055] Embodiment one

[0056] Please refer to Figures 1 to 4 , the pressure reduction module 20 is located at the first connecting pipe 12, and is arranged integrally with the first connecting pipe 12 or arranged separately. Alternatively, the pressure reduction module 20 is located at the first interface section 111, and is arranged integrally with the first interface section 111 or arranged separately. Alternatively, the pressure reduction module 20 is located at the connection between the first connecting pipe 12 and the first interface section 111. Moreover, the pressure reduction module 20 has a through hole 201 penetrating through along the axial direction of the pressure reduction module 20, and at least part of the through hole 201 has a flow cross-sectional area smaller than that of the first side 102.

[0057] Optionally, in an embodiment, as shown in FIG. 2A, the through hole 201 comprises a first through flow channel 21 extending along the axis of the pressure reduction module 20 at a constant diameter and penetrating through both ends of the pressure reduction module 20. Figure 2

[0058] Alternatively, in another embodiment, as shown in FIG. 2B, the through hole 201 comprises a first through flow channel 21 extending along the axis of the pressure reduction module 20 at a constant diameter and at least one horn 22 located at the end of the first through flow channel 21. The horn 22 expands outwardly relative to the axis of the pressure reduction module 20. Figure 3

[0059] The minimum flow cross-sectional area of the through hole 201 is S1, and the flow cross-sectional area of the valve port 101 is S2. 0.8S2≤S1≤2S2. The refrigerant is throttled at the minimum flow cross-sectional area of the through hole 201. It can be understood that if S1 is too small, the refrigerant flow through the first through flow channel 21 will be too small, and if S1 is too large, it will be difficult to throttle the refrigerant. Therefore, by setting 0.8S2≤S1≤2S2, the refrigerant flow through the first through flow channel 21 is prevented from being too small while ensuring that the first through flow channel 21 has a throttling effect on the refrigerant. For example, S1 can be 0.8S2, S1 can be S2, S1 can be 1.5S2, or S1 can be 2S2.

[0060] The extension length of the through hole 201 is L1, and the inner diameter of the valve port 101 is D. 0.5D≤L1≤6D. It can be understood that since the through hole 201 penetrates through both ends of the pressure reduction module 20 along the axis of the pressure reduction module 20, if the extension length L1 of the through hole 201 is too small, i.e., the extension length of the pressure reduction module 20 along the axis is too small, it will affect the structural strength of the pressure reduction module 20. If L1 is too large, it will increase the processing difficulty of the first through flow channel 21. Therefore, by setting 0.5D≤L1≤6D, the structural strength of the pressure reduction module 20 is ensured while facilitating the processing of the first through flow channel 21. For example, L1 can be 0.5D, L1 can be D, L1 can be 1.5D, L1 can be 5D, or L1 can be 6D, etc.

[0061] Optionally, the number of through holes 201 is one, and one through hole 201 is located at the axis of the pressure reduction module 20. Alternatively, the number of through holes 201 can also be multiple, and multiple through holes 201 are distributed at intervals on the pressure reduction module 20. Specifically, the multiple through holes 201 can be uniformly distributed around the axis of the pressure reduction module 20.

[0062] As shown in FIG. 2A and FIG. 2B, the through hole 201 is arranged in the pressure reduction module 20. Figure 1 and Figure 2 ​​As shown, the first connecting pipe 12 is plugged into the first interface section 111, and the first interface section 111 has a limiting surface 111a arranged towards and spaced apart from the first connecting pipe 12; the pressure reduction module 20 is provided with a limiting ring 23 protruding radially outward, and the limiting ring 23 is clamped between the end surface of the first connecting pipe 12 and the limiting surface 111a along the axial direction.

[0063] In this way, the first connecting pipe 12, the first interface section 111 and the pressure reduction module 20 are conveniently assembled and fixed. Specifically, when assembling the first connecting pipe 12, the first interface section 111 and the pressure reduction module 20, the pressure reduction module 20 can be first assembled into the first interface section 111 so that one side of the limiting ring 23 abuts against the limiting surface 111a; then the first connecting pipe 12 is inserted into the first interface section 111 so that the end surface of the first connecting pipe 12 abuts against the other side of the limiting ring 23. The two sides of the limiting ring 23 can be respectively welded and fixed with the end surface of the first connecting pipe 12 and the limiting ring 23. Further, the limiting ring 23 is arranged at one end of the pressure reduction module 20 close to the valve port 101.

[0064] Please refer to Figures 5 to 10 The pressure reduction module 20 can also be configured as a capillary tube, the inner diameter of the capillary tube is d, the inner diameter of the valve port 101 is D, and 0.8D≤d≤1.5D. It can be understood that if d is too small, it will affect the flow of refrigerant entering the expansion valve 100, and if d is too large, the capillary tube may not be able to throttle the refrigerant. Therefore, by setting 0.8D≤d≤1.5D, the flow of refrigerant entering the expansion valve 100 can be ensured while the refrigerant is throttled.

[0065] The capillary tube has an extension length L2, the inner diameter of the valve port 101 is D, and D≤L2≤100D. The capillary tube can be configured in the following two forms.

[0066] Embodiment two

[0067] Please refer to Figure 5 and Figure 6 The pressure reduction module 20 is configured as a first capillary tube 24; the first capillary tube 24 is arranged at the first connecting pipe 12, and the first capillary tube 24 is fixedly connected with the first interface section 111, at this time, the first capillary tube 24 is configured as a part of the first connecting pipe 12.

[0068] Alternatively, the first connecting pipe 12 includes a first sleeve 121, the first capillary tube 24 is fixedly connected with the first interface section 111 through the first sleeve 121, and the flow area of the first capillary tube 24 is smaller than the flow area of the first sleeve 121. The first capillary tube 24 and the first sleeve 121 are an integral structure, or the first capillary tube 24 and the first sleeve 121 are a split structure and are fixedly connected.

[0069] Further, the first pipe 12 further comprises a second sleeve 122, the second sleeve 122 is connected to an end of the first pipe 12 away from the first interface segment 111, and a flow area of the first capillary tube 24 is smaller than a flow area of the second sleeve 122. The first capillary tube 24 and the second sleeve 122 are in an integrated structure, or the first capillary tube 24 and the second sleeve 122 are in a separate structure and are fixedly connected.

[0070] In the embodiment, the first capillary tube 24 is configured as a stainless steel tube, the first sleeve 121 and the second sleeve 122 are both copper tubes, and the first sleeve 121 and the second sleeve 122 are sleeved on the outer periphery of the first capillary tube 24 and are welded and fixed with the first capillary tube 24.

[0071] In one of the embodiments, as shown in Figure 5 , the first interface segment 111 is arranged on the side wall of the main valve body 11, and the first capillary tube 24 is connected to the first interface segment 111 through the first sleeve 121. That is, the first capillary tube 24 is connected to the side wall of the main valve body 11.

[0072] In another embodiment, as shown in Figure 6 , the first interface segment 111 is arranged on an end of the main valve body 11 away from the sleeve 40 along the axial direction of the main valve body 11, and the first capillary tube 24 is connected to the first interface segment 111 through the first sleeve 121. That is, the first capillary tube 24 is connected to the end of the main valve body 11 away from the sleeve 40 along the axial direction of the main valve body 11.

[0073] Embodiment three

[0074] Please refer to Figures 7 to 10 , the pressure reduction module 20 is configured as a second capillary tube 25, the second capillary tube 25 is connected to an end of the first pipe 12 away from the first interface segment 111, and a flow area of at least part of the second capillary tube 25 is smaller than a flow area of the first pipe 12.

[0075] Further, the expansion valve further comprises a connecting pipe 60, the connecting pipe 60 comprises a large-diameter segment 61, a small-diameter segment 62, and a tapered transition segment 63 connecting the large-diameter segment 61 and the small-diameter segment 62; the small-diameter segment 62 is sleeved and connected with the second capillary tube 25, and the large-diameter segment 61 is sleeved and connected with an end of the first pipe 12 away from the first interface segment 111.

[0076] In the embodiment, the large-diameter segment 61, the small-diameter segment 62, and the tapered transition segment 63 are configured as an integrated structure. The small-diameter segment 62 is sleeved on the second capillary tube 25 and is fixedly connected with the second capillary tube 25. The large-diameter segment 61 is sleeved on an end of the first pipe 12 away from the first interface segment 111 and is fixedly connected with the first pipe 12.

[0077] Further, the second capillary tube 25 is provided with a filter at an end away from the connecting pipe 60, or the filter can also be arranged at the connection between the connecting pipe 60 and the second capillary tube 25.

[0078] In one embodiment, as shown in Figure 7 and Figure 8 , the first interface section 111 is arranged on the side wall of the main valve body 11, the first connecting pipe 12 is connected to the first interface section 111, and the second capillary tube 25 is connected to an end of the first connecting pipe 12 away from the first interface section 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.

[0079] In another embodiment, as shown in Figure 9 and Figure 10 , the first interface section 111 is arranged on an end of the main valve body 11 away from the sleeve 40 along the axial direction of the main valve body 11, the first connecting pipe 12 is connected to the first interface section 111, and the second capillary tube 25 is connected to an end of the first connecting pipe 12 away from the first interface section 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.

[0080] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in contradictions.

[0081] The above-described embodiments only express several embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An expansion valve characterized by, The expansion valve comprises a valve body assembly (10), a pressure reduction module (20) and a sound attenuation 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 communicates the first side (102) and the second side (103); The pressure reduction module (20) is arranged at the first side (102), and the flow area of the first side (102) is reduced at the pressure reduction module (20), and the sound attenuation assembly (30) is arranged at the second side (103); The expansion valve has a first working condition, and when the expansion valve is in the first working condition, the working medium flows from the first side (102) to the second side (103), and sequentially flows through the pressure reduction module (20), the valve port (101) and the sound attenuation assembly (30).

2. The expansion valve according to claim 1, characterized by, The valve body assembly (10) comprises a main valve body (11), a first connecting pipe (12) and a second connecting pipe (13), the valve port (101) is arranged on the main valve body (11), and the main valve body (11) further comprises a first interface section (111) and a second interface section (112) which respectively communicate with the valve port (101); The first connecting pipe (12) is connected with the first interface section (111) to form the first side (102), and the second connecting pipe (13) is connected with the second interface section (112) to form the second side (103).

3. The expansion valve according to claim 2, wherein The first interface section (111) is arranged at one end of the main valve body (11) along the axial direction of the main valve body (11), and the second interface section (112) is arranged on the side wall of the main valve body (11). Alternatively, the first interface section (111) is arranged on the side wall of the main valve body (11), and the second interface section (112) is arranged at one end of the main valve body (11) along the axial direction of the main valve body (11).

4. The expansion valve according to claim 2 or 3, characterized in that, The pressure reduction module (20) is located at the first connecting pipe (12), or at the first interface section (111), or at the connection between the first connecting pipe (12) and the first interface section (111); Furthermore, along the axial direction of the pressure reduction module (20), the pressure reduction module (20) has a through hole (201) which penetrates through the pressure reduction module (20) along the axial direction of the pressure reduction module (20), and at least part of the through hole (201) has a flow area smaller than that of the first side (102).

5. The expansion valve according to claim 4, wherein The through hole (201) comprises a first through flow channel (21) which extends along the axial direction of the pressure reduction module (20) and penetrates through both ends of the pressure reduction module (20) with a constant diameter. Alternatively, the through hole (201) comprises a first through flow channel (21) and at least one horn (22) which are connected in communication, the first through flow channel (21) extends along the axial direction of the pressure reduction module (20) with a constant diameter, and at least one horn (22) is located at the end of the first through flow channel (21).

6. The expansion valve according to claim 4, wherein The minimum flow area of the through hole (201) is S1, the flow area of the valve port (101) is S2, and 0.8S2≤S1≤2S2.

7. The expansion valve of claim 4, wherein The through hole (201) has an extension length L1, and the valve port (101) has an inner diameter D, and 0.5D≤L1≤6D.

8. The expansion valve of claim 4, wherein The number of the through holes (201) is one or more, and when the number of the through holes (201) is more than one, the through holes (201) are distributed at intervals on the pressure reduction module (20).

9. The expansion valve of claim 4, wherein The first connector (12) is inserted into the first interface section (111), and the first interface section (111) has a limiting surface (111a) facing and spaced from the first connector (12). The pressure reduction module (20) is provided with a limiting ring (23) protruding radially outward, and the limiting ring (23) is clamped axially between the end surface of the first connector (12) and the limiting surface (111a).

10. The expansion valve according to claim 2 or 3, characterized by The pressure reduction module (20) is configured as a capillary tube, and the capillary tube has an inner diameter d, the valve port (101) has an inner diameter D, and 0.8D≤d≤1.5D. And / or, the capillary tube has an extension length L2, the valve port (101) has an inner diameter D, and D≤L2≤100D.

11. The expansion valve according to claim 10, wherein The pressure reduction module (20) is configured as a first capillary tube (24). The first capillary tube (24) is arranged at the first connector (12), and the first capillary tube (24) is fixedly connected with the first interface section (111). Alternatively, the first connector (12) comprises a first sleeve (121), the first capillary tube (24) is fixedly connected with the first interface section (111) through the first sleeve (121), the flow area of the first capillary tube (24) is smaller than that of the first sleeve (121), and the first capillary tube (24) and the first sleeve (121) are in an integrated structure or a split structure and are fixedly connected.

12. The expansion valve of claim 11, wherein, The first connector (12) further comprises a second sleeve (122), the second sleeve (122) is connected to one end of the first connector (12) away from the first interface section (111), the flow area of the first capillary tube (24) is smaller than that of the second sleeve (122), and the first capillary tube (24) and the second sleeve (122) are in an integrated structure or a split structure and are fixedly connected.

13. The expansion valve of claim 10, wherein, The pressure reduction module (20) is configured as a second capillary tube (25), and the second capillary tube (25) is connected to one end of the first connector (12) away from the first interface section (111). At least part of the flow area of the second capillary tube (25) is smaller than that of the first connector (12).

14. The expansion valve of claim 13, wherein, The expansion valve further comprises a connecting pipe (60), and the connecting pipe (60) comprises 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 connected with the second capillary (25) in a sleeved manner, and the large-diameter section (61) is connected with one end of the first connecting pipe (12) away from the first interface section (111) in a sleeved manner.

15. The expansion valve of claim 2, wherein, The sound attenuation assembly (30) is arranged in the second connecting pipe (13), or arranged in the second interface section (112), or arranged at the connection between the second connecting pipe (13) and the second interface section (112).

16. The expansion valve of claim 1, wherein The sound attenuation assembly (30) comprises at least one sound attenuation block (32), and the at least one sound attenuation block (32) is configured as a porous structure.

17. The expansion valve of claim 16, wherein, The sound attenuation assembly (30) further comprises a support (31), and the at least one sound attenuation block (32) is mounted to the second side (103) through the support (31).

18. The expansion valve of claim 16, wherein, The sound attenuation assembly (30) comprises a plurality of sound attenuation blocks (32), and the plurality of sound attenuation blocks (32) are arranged at intervals along the flow direction of the working medium.

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