Expansion valve
By designing a movable silencing component in the electronic expansion valve, the position is automatically adjusted according to the refrigerant flow direction, thus solving the refrigerant cavitation noise problem and achieving noise reduction even at a small opening.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG DUNAN HETIAN METAL CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-28
AI Technical Summary
When the electronic expansion valve is in a small opening state, the refrigerant flowing through the valve port is prone to generating noise, especially due to cavitation noise caused by the refrigerant with a large degree of subcooling scouring the porous sound-absorbing structure.
An expansion valve was designed in which a silencing component is located between the valve port and the end cap. It automatically switches to the closed or open position according to the direction of refrigerant flow, so as to avoid the refrigerant with a high liquid phase ratio from scouring the porous silencing part, and to refine the bubbles through the porous silencing part when the bubble content is high.
It effectively reduces refrigerant noise, especially at small openings, avoiding noise generated by refrigerant cavitation with a high liquid phase ratio. It also refines bubbles and reduces noise when the refrigerant is undercooled.
Smart Images
Figure CN224175382U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of valve technology, and in particular to an expansion valve. Background Technology
[0002] An electronic expansion valve is a common throttling element. It is mainly used in refrigeration systems. By changing the valve opening, the flow and pressure of the refrigerant are controlled, thereby realizing the compression, cooling and evaporation cycle of the refrigerant.
[0003] During the operation of electronic expansion valves, discontinuous large bubbles can easily form in the refrigerant before or after throttling at the valve orifice, generating noise. To reduce the noise of electronic expansion valves, porous silencing structures are usually installed in the flow path of the valve. Although the silencing structure can reduce noise, when the electronic expansion valve is in a small opening state under certain operating conditions, the subcooling of the refrigerant before flowing into the valve orifice is relatively large. After flowing through the valve orifice, the highly subcooled pure liquid refrigerant becomes a gas-liquid two-phase state with a higher liquid phase ratio or a purely liquid refrigerant with a small subcooling. The high-velocity refrigerant can easily cause cavitation and generate noise by scouring the porous silencing structure. Utility Model Content
[0004] Therefore, it is necessary to provide an expansion valve to solve the problem that the refrigerant with a high degree of subcooling is prone to cavitation and noise generation when it flows through the valve port and washes over the porous silencing structure.
[0005] An expansion valve includes a valve body assembly, an end cap, and a silencer assembly. The valve body assembly has a valve port, a first side, and a second side, with the valve port located between and communicating with the first and second sides. The end cap and the silencer assembly are mounted together on the first and / or second sides. The end cap is fixed to the valve body assembly and forms a first channel with it. The silencer assembly is movably located between the valve port and the end cap, and has a porous silencing portion. The silencer assembly forms a second channel with the valve body assembly and has an open position and a closed position. When the flow direction of the working medium is from the valve port to the end cap, the silencer assembly moves to the closed position, the end cap closes the porous silencing portion, and the working medium flows along the second channel and the first channel. When the flow direction of the working medium is from the end cap to the valve port, the silencer assembly moves to the open position, the porous silencing portion opens, and the working medium can pass through the porous silencing portion and then flow along the first channel.
[0006] In one embodiment, the valve body assembly has a stepped surface facing the silencing assembly. When the silencing assembly moves to the open position, the silencing assembly abuts against the stepped surface, and the second channel is closed.
[0007] In one embodiment, the silencing assembly includes a connecting sleeve, with a second channel formed between the connecting sleeve and the valve body assembly; the porous silencing part is configured as a silencing block, which is installed on the connecting sleeve. The connecting sleeve has a first port facing the valve port and a second port facing away from the valve port. When the silencing assembly is in the open position, the second port is spaced apart from the end cap; when the silencing assembly is in the closed position, the second port is closed by the end cap.
[0008] In one embodiment, the connecting sleeve has a first through hole extending through both ends of itself, the first through hole forming a second channel; or, the connecting sleeve has a first notch, the first notch and the valve body assembly forming a second channel. Alternatively, the inner wall of the valve body assembly has a recess, the recess and the connecting sleeve forming a second channel.
[0009] In one embodiment, when the flow direction of the working medium is from the valve port to the end cap, after the working medium flows from the valve port, a portion of the working medium first enters the interior of the connecting sleeve through the first port, and another portion of the working medium flows to the first through hole or the first notch, and then the working medium flows through the first channel; when the flow direction of the working medium is from the end cap to the valve port, the working medium first passes through the first channel, then passes through the porous silencing part, and flows to the valve port.
[0010] In one embodiment, the silencing assembly further includes a support, and the number of silencing blocks is configured to be multiple, with the multiple silencing blocks spaced apart along the flow direction of the working medium, and the support is disposed between two silencing blocks.
[0011] In one embodiment, one of the valve body assembly and the connecting sleeve is provided with a guide rail, and the other is provided with a guide groove. The guide rail and the guide groove are movable and engaged along the opening and closing direction of the muffler assembly.
[0012] In one embodiment, the end cap has a groove facing the silencing assembly. When the silencing assembly is in the closed position, the second port abuts against the bottom wall of the groove or seals the opening of the groove; when the silencing assembly is in the open position, the second port disengages from the groove.
[0013] In one embodiment, when the flow direction of the working medium is from the valve port to the end cap, the working medium can push the silencing component from the open position to the closed position; when the flow direction of the working medium is from the end cap to the valve port, the working medium can push the silencing component from the closed position to the open position.
[0014] In one embodiment, when the end cap and the silencing assembly are vertically arranged, the diameter of the valve port is d, the mass of the silencing assembly is m, and the flow direction of the working medium is from the end cap to the valve port, the pressure difference across the silencing assembly is y, and m < πd. 2 y / 4g, where 0.2Mpa≤y≤3.5Mpa.
[0015] In one embodiment, the valve body assembly includes a main valve body, a first connecting pipe and a second connecting pipe, and a 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 interface section is disposed on the side wall of the main valve body, and the second interface section is disposed at one end of the main valve body along its own axial direction. The first connecting pipe is connected to the first interface section to form a first side, and the second connecting pipe is connected to the second interface section to form a second side.
[0016] In one embodiment, the flow area of the valve port is S1, the flow area of the second channel is S2, and S1 < S2 ≤ 3S1.
[0017] In one embodiment, the end cap and valve body assembly are fixed by laser welding, brazing, or riveting.
[0018] Compared with the prior art, the expansion valve provided in this application has a silencing component that is movably located between the valve port and the end cap. When the refrigerant flows from the valve port to the end cap, the silencing component moves to the closed position, and the end cap closes the porous silencing section. Thus, when the expansion valve is at a small opening, the refrigerant with a higher flow rate has a larger subcooling before flowing into the valve port. After flowing through the valve port, the highly subcooled pure liquid refrigerant becomes a gas-liquid two-phase state with a higher liquid phase ratio or a pure liquid refrigerant with a smaller subcooling. The gas-liquid two-phase state with a higher liquid phase ratio or the pure liquid refrigerant with a smaller subcooling will not pass through the porous silencing section, that is, it cannot be flushed by the porous silencing section. Instead, it flows along the second channel. Therefore, it can avoid the gas-liquid two-phase state with a higher liquid phase ratio or the pure liquid refrigerant with a smaller subcooling being prone to cavitation and generating noise due to flushing the porous silencing section. Furthermore, when the working medium flows from the end cap to the valve port, the silencing component moves to the open position and the porous silencing section opens. Thus, when the refrigerant subcooling from the end cap to the valve port is insufficient and the refrigerant contains a high amount of air bubbles, the refrigerant can first pass through the porous silencing section, which refines the air bubbles in the refrigerant before flowing through the valve port for throttling, thereby helping to reduce refrigerant noise. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A front view of the expansion valve provided in this application;
[0021] Figure 2 A cross-sectional view of the expansion valve along its own axial direction in one embodiment provided in this application;
[0022] Figure 3 An enlarged schematic diagram of the silencing component provided in this application at point A when it is in the closed position;
[0023] Figure 4 An enlarged schematic diagram of the silencing component provided in this application at point A when it is in the open position;
[0024] Figure 5 A cross-sectional view of the expansion valve provided in this application along its own radial direction. Figure 1 ;
[0025] Figure 6 A cross-sectional view of the expansion valve provided in this application along its own radial direction. Figure 2 ;
[0026] Figure 7 An exploded view of the silencing assembly and end cap provided in this application;
[0027] Figure 8 A cross-sectional view of the expansion valve along its own axial direction in another embodiment provided in this application.
[0028] 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; 112, Second interface section; 12, First connecting pipe; 13, Second connecting pipe; 14, Guide rail; 15, Stepped surface; 20, End cap; 21, Groove; 30, Silencing assembly; 31, First port; 32, Second port; 33, Connecting sleeve; 331, Main body section; 332, Flanged edge; 332b, First notch; 333, Gap; 334, Guide groove; 304, Perforated silencing part; 34, Silencing block; 341, First silencing block; 341a, First through hole; 342, Second silencing block; 342a, Second through hole; 35, Bracket; 40, First channel; 50, Second channel; 51, Second through hole; 60, Sleeve. Detailed Implementation
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] Please see Figures 1 to 4This application provides an expansion valve 100, which includes a valve body assembly 10, an end cap 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 communicates with the first side 102 and the second side 103. The end cap 20 and the silencing assembly 30 are installed together on the first side 102 and / or the second side 103. The end cap 20 is fixedly connected to the valve body assembly 10 and forms a first channel 40 between it and the valve body assembly 10. The silencing assembly 30 is movably located between the valve port 101 and the end cap 20 and has a porous silencing portion 3. 04, and a second channel 50 is formed between the silencing component 30 and the valve body component 10. The silencing component 30 has an open position and a closed position. When the flow direction of the working medium is from the valve port 101 to the end cover 20, the silencing component 30 moves to the closed position, the end cover 20 closes the porous silencing part 304, and the working medium flows along the second channel 50 and the first channel 40 after being throttled by the valve port 101. When the flow direction of the working medium is from the end cover 20 to the valve port 101, the silencing component 30 moves to the open position, the porous silencing part 304 opens, and the working medium can pass through the porous silencing part 304 and then flow along the first channel 40 to the valve port 101.
[0035] It should be noted that the expansion valve 100 provided in this application may have the end cap 20 and the silencing component 30 installed only on the first side 102, or only on the second side 103, or both on the first side 102 and the second side 103. The working medium can flow bidirectionally between the valve port 101 and the end cap 20; that is, the flow direction of the working medium can be from the valve port 101 to the end cap 20, or from the end cap 20 to the valve port 101. The expansion valve 100 may include, but is not limited to, an electronic expansion valve, and the working medium may be refrigerant. The following description uses refrigerant as the working medium as an example to illustrate the operation of the expansion valve.
[0036] By setting the silencing component 30 to be movable between the valve port 101 and the end cap 20, when the refrigerant flows from the valve port 101 to the end cap 20, the silencing component 30 moves to the closed position, and the end cap 20 closes the porous silencing section 304. Thus, when the expansion valve 100 is at a small opening, the refrigerant has a large subcooling degree before flowing into the valve port 101. After flowing through the valve port 101, the high-velocity, high-subcooling pure liquid refrigerant becomes a gas-liquid two-phase state with a high liquid phase ratio or a pure liquid refrigerant with a small subcooling degree. The gas-liquid two-phase state with a high liquid phase ratio or the pure liquid refrigerant with a small subcooling degree will not pass through the porous silencing section 304, that is, it cannot be flushed to the porous silencing section 304, but flows along the second channel 50. Therefore, it can avoid the gas-liquid two-phase state with a high liquid phase ratio or the pure liquid refrigerant with a small subcooling degree from easily cavitating and generating noise due to flushing the porous silencing section 304. Furthermore, when the working medium flows from the end cap 20 to the valve port 101, the silencing component 30 moves to the open position, and the porous silencing part 304 opens. Thus, when the refrigerant subcooling from the end cap 20 to the valve port 101 is insufficient and the refrigerant contains a high amount of air bubbles, the refrigerant can first pass through the porous silencing part 304, which refines the air bubbles in the refrigerant, and then flow through the valve port 101 for throttling, thereby helping to reduce refrigerant noise.
[0037] The following describes the working process of the silencing component 30 between the valve port 101 and the end cover 20, based on the specific structure of the expansion valve 100 and its operating conditions.
[0038] Specifically, such as Figure 2 As shown, the expansion valve also includes a sleeve 60. The valve body assembly 10 includes a main valve body 11, a first connecting pipe 12, and a second connecting pipe 13. The sleeve 60 is sleeved on one end of the main valve body 11 along its own axial direction. The valve port 101 is disposed on the main valve body 11. The main valve body 11 also includes a first interface section 111 and a second interface section 112 that are respectively connected to the valve port 101. 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 on the end of the main valve body 11 away from the sleeve 60 along its own axial direction. 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.
[0039] Exemplarily, in one embodiment, such as Figure 2As shown, the end cap 20 and the silencing component 30 are both located on the second side 103, specifically on the second connecting pipe 13, the second interface section 112, or at the connection between the second connecting pipe 13 and the second interface section 112. The expansion valve 100 has heating and cooling modes. When the expansion valve is in heating mode, refrigerant enters the valve body assembly 10 from the first side 102, the silencing component 30 moves to the closed position, the end cap 20 closes the porous silencing part 304, and the refrigerant flows along the second channel 50 and the first channel 40 after being throttled by the valve port 101, and then flows out from the second side 103. When the expansion valve is in cooling mode, refrigerant enters the valve body assembly 10 from the second side 103, the silencing component 30 moves to the open position, the porous silencing part 304 opens, the refrigerant first flows through the first channel 40, then through the porous silencing part 304, flows through the valve port 101 for throttling, and then flows out from the first side 102.
[0040] Exemplarily, in another embodiment, such as Figure 8 As shown, the end cap 20 and the silencing assembly 30 are both located on the first side 102, specifically on the first connecting pipe 12, the first interface section 111, or the connection between the first connecting pipe 12 and the first interface section 111. The expansion valve 100 has heating and cooling modes. When the expansion valve is in heating mode, refrigerant enters the valve body assembly 10 from the second side 103, the silencing assembly 30 moves to the closed position, the end cap 20 closes the porous silencing part 304, and the refrigerant flows along the second channel 50 and the first channel 40 after being throttled by the valve port 101, and then flows out from the first side 102. When the expansion valve is in cooling mode, refrigerant enters the valve body assembly 10 from the first side 102, the silencing assembly 30 moves to the open position, the porous silencing part 304 opens, the refrigerant first flows through the first channel 40, then through the porous silencing part 304, flows through the valve port 101 for throttling, and then flows out from the second side 103.
[0041] In another embodiment, the first side 102 is provided with an end cap 20 and a silencing component 30, and the second side 103 is also provided with an end cap 20 and a silencing component 30. When refrigerant enters from the first side 102 and exits from the second side 103, the silencing component 30 in the first side 102 moves to the open position, and the silencing component 30 in the second side 103 moves to the closed position; when refrigerant enters from the second side 103 and exits from the first side 102, the silencing component 30 in the second side 103 moves to the open position, and the silencing component 30 in the first side 102 moves to the closed position.
[0042] Please see Figures 3 to 4When the working medium flows from valve port 101 to end cap 20, the working medium can push the silencer assembly 30 from the open position to the closed position; when the working medium flows from end cap 20 to valve port 101, the working medium can push the silencer assembly 30 from the closed position to the open position. That is, the pressure difference generated by the refrigerant at both ends of the silencer assembly 30 drives the silencer assembly 30 to switch between the open and closed positions.
[0043] Furthermore, in one embodiment, the end cap 20 and the silencing assembly 30 are vertically arranged, that is, the end cap 20 is located below the valve port 101 along the direction of gravity, the diameter of the valve port 101 is d, the mass of the silencing assembly 30 is m, and when the flow direction of the working medium is from the end cap 20 to the valve port 101, the pressure difference across the silencing assembly 30 is y, and m < πd. 2 y / 4g, where 0.2Mpa≤y≤3.5Mpa.
[0044] It should be noted that when the refrigerant flow direction changes from from valve port 101 to end cap 20 to from end cap 20 to valve port 101, the refrigerant applies a pressure F to the silencer assembly 30, and F = πd 2 y / 4, the weight of the muffler assembly 30 is G, and G = mg. In order to ensure that the working medium can push the muffler assembly 30 to open the first port 31, it is necessary to satisfy F > mg, that is, πd 2 y / 4 > mg, that is, by setting m < πd 2 y / 4g ensures that when the refrigerant flows from the end cap 20 to the valve port 101, it can push the silencer assembly to the open position.
[0045] Furthermore, in one embodiment, the valve body assembly 10 is provided with a stepped surface 15 facing the silencing assembly 30. When the silencing assembly 30 moves to the open position, the silencing assembly 30 abuts against the stepped surface 15, and the second channel 50 is closed. It is understood that the stepped surface 15 not only limits the maximum travel of the silencing assembly 30 from the closed position to the open position, but also closes the second channel 50 when the silencing assembly 30 abuts against the stepped surface 15. This ensures that the refrigerant flowing from the end cover 20 to the valve port 101 can only flow to the valve port 101 through the porous silencing part 304, and will not flow to the valve port 101 through the second channel 50. In this way, it can be ensured that the refrigerant flowing from the end cover 20 to the valve port 101 passes through the porous silencing part 304 to refine the air bubbles, thereby improving the noise reduction effect.
[0046] In one embodiment, the flow area of the valve port 101 is S1, the flow area of the second channel 50 is S2, and S1 < S2 ≤ 3S1. It is understood that by setting S1 < S2, the valve port 101 can be guaranteed to have a throttling effect; by setting S2 ≤ 3S1, it is possible to avoid uneven flow of refrigerant through the second channel 50 due to an excessively large flow area, which would generate turbulence within the second channel 50 and further scour the structural edges, causing excitation and noise.
[0047] It should be noted that the flow area of the first channel 40 can be a fixed value or it can vary along the axial direction of the silencing component 30. When the flow area of the first channel 40 varies along the axial direction of the silencing component 30, S2 refers to the minimum flow area of the first channel 40. In one embodiment, as... Figure 5 and Figure 7 As shown, one of the valve body assembly 10 and the connecting sleeve 33 is provided with a guide rail 14, and the other is provided with a guide groove 334. The guide rail 14 and the guide groove 334 are movablely engaged along the opening and closing direction of the muffler assembly 30. It can be understood that the engagement of the guide rail 14 and the guide groove 334 can guide the muffler assembly 30 to move more smoothly between the closed position and the open position.
[0048] The cross-section of the guide rail 14 can be configured as an arc, rectangle, or other polygon, and the shape of the guide groove 334 is adapted to the cross-sectional shape of the guide rail 14. The number of guide rails 14 can be one or more. When multiple guide rails 14 are configured, they are distributed circumferentially around the silencing assembly 30 to ensure more uniform force distribution on the silencing assembly 30. For example, multiple guide rails 14 can be evenly distributed circumferentially around the silencing assembly 30.
[0049] like Figures 3 to 7 As shown, the silencing assembly 30 includes a connecting sleeve 33, which is fixedly connected to the valve body assembly 10 and forms a second channel 50 between the connecting sleeve 33 and the valve body assembly 10; the porous silencing part 304 is configured as a silencing block 34, which is installed on the connecting sleeve 33. The connecting sleeve 33 has a first port 31 facing the valve port 101 and a second port 32 facing away from the valve port 101. When the silencing assembly 30 is in the open position, the end cap 20 opens the second port 32; when the silencing assembly 30 is in the closed position, the end cap 20 closes the second port 32.
[0050] Understandably, since the porous silencer block 34 is installed inside the connecting sleeve 33, when the end cap 20 closes the second port 32, the gas-liquid two-phase refrigerant with a high liquid phase ratio or pure liquid refrigerant with a small subcooling degree, after being throttled by the valve port 101, can flow into the connecting sleeve 33 from the first port 31 or into the second channel 50. Once the connecting sleeve 33 is full of refrigerant, it will no longer flush the silencer block 34 inside the connecting sleeve 33, but can only flow along the second channel 50, thus effectively preventing cavitation noise. When the silencer assembly 30 is in the open position, the end cap 20 opens the second port 32, allowing refrigerant with insufficient subcooling to enter the connecting sleeve 33 through the second port 32 and have its bubbles refined by the silencer block 34 inside the connecting sleeve 33.
[0051] The silencing block 34 can be configured as a filter sintering block. Optionally, in one embodiment, the connecting sleeve 33 has a first through hole extending through both ends of itself, and the first through hole constitutes a second channel 50.
[0052] Alternatively, in another embodiment, the connecting sleeve 33 has a first notch 332b, and a second channel 50 is formed between the first notch 332b and the valve body assembly 10.
[0053] Alternatively, in yet another embodiment, the inner wall of the valve body assembly 10 has a recess, which, together with the connecting sleeve 33, forms a second channel 50.
[0054] In one embodiment, the connecting sleeve 33 includes a main body segment 331 and a flange 332. Along the refrigerant flow direction, the flange 332 is positioned relative to the main body segment 331 and close to the valve port 101. A first through hole or a first notch 332b is provided on the flange 332. The main body segment 331 is spaced apart from the valve body assembly 10 and forms a gap 333. The gap 333 communicates with the first through hole or the first notch 332b to form a second channel 50.
[0055] Thus, when the flow direction of the working medium is from valve port 101 to end cap 20, after the working medium flows from valve port 101, a portion of the working medium first enters the connecting sleeve 33 through the first port 31, and the other portion of the working medium flows to the first through hole or the first notch 332b, and then the working medium flows through the first channel 40; when the flow direction of the working medium is from end cap 20 to valve port 101, the working medium first passes through the first channel 40, then passes through the porous silencing part 304, and flows to valve port 101.
[0056] The number of first through holes or first notches 332b is configured to be multiple, and the first through holes or first notches 332b are distributed at intervals along the circumference of the connecting sleeve 33, for example, they can be evenly distributed. Specifically, one end of the flange 332 is connected to the main body segment 331, and the other end extends outward along the radial direction of the main body segment 331. In this embodiment, the minimum flow area S2 of the second channel 50 is the sum of the flow areas of the multiple first through holes, or the sum of the flow areas of the multiple first notches 332b.
[0057] The silencing assembly 30 also includes a support 35. Multiple silencing blocks 34 are configured, spaced apart along the flow direction of the working medium, with the support 35 positioned between them. Thus, as the refrigerant passes through the silencing assembly 30, each silencing block 34 refines the air bubbles in the refrigerant, thereby improving the refining effect. The support 35 provides support between two silencing blocks 34. "Multiple silencing blocks 34" refers to two or more silencing blocks 34.
[0058] Exemplarily, in one embodiment, such as Figure 4 As shown, two silencers 34 are configured, namely a first silencer 341 and a second silencer 342. Along the flow direction of the working medium, the first silencer 341 is positioned closer to the valve port 101 than the second silencer 342. The first silencer 341 has a first through-hole 341a, and the second silencer 342 has a second through-hole 342a. The projection of the first through-hole 341a along the refrigerant flow direction coincides with the portion of the second silencer 342 that is not the second through-hole 342a; similarly, the projection of the second through-hole 342a along the refrigerant flow direction coincides with the portion of the first silencer 341 that is not the first through-hole 341a.
[0059] In one embodiment, such as Figure 3 and Figure 4 As shown, the end cap 20 has a groove 21 facing the muffler assembly 30. When the muffler assembly 30 is in the closed position, the second port 32 abuts against the bottom wall of the groove 21 or blocks the opening of the groove 21; when the muffler assembly 30 is in the open position, the second port 32 disengages from the groove 21. That is, the end cap 20 opens or closes the muffler assembly 30 through the bottom wall of the groove 21.
[0060] Specifically, when the muffler assembly 30 is in the closed position, the second port 32 of the connecting sleeve 33 extends into the groove 21. The groove 21 can close the second port 32 by sealing the outer wall of the second port 32 with its own opening, or by abutting the end of the second port 32 with its own bottom wall.
[0061] Furthermore, the end cap 20 is fixed to the valve body assembly 10 by laser welding, brazing, or riveting.
[0062] Optionally, the second channel 50 can be configured as a second through hole 51 or a second notch opened on the side wall of the end cover 20. Of course, the second channel 50 can also be configured as a recess located on the inner wall of the valve body assembly 10.
[0063] 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.
[0064] 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 patent application. 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 scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.
Claims
1. An expansion valve, characterized in that, The expansion valve includes a valve body assembly (10), an end cap (20), and a silencer 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 with the first side (102) and the second side (103). The end cap (20) and the silencing assembly (30) are installed together on the first side (102) and / or the second side (103). The end cap (20) is fixedly connected to the valve body assembly (10) and forms a first channel (40) between the end cap (20) and the valve body assembly (10). The silencing assembly (30) is movably located between the valve port (101) and the end cap (20). The silencing assembly (30) has a porous silencing part (304), and forms a second channel (50) between the silencing assembly (30) and the valve body assembly (10). The silencing assembly (30) has an open position and a closed position. When the flow direction of the working medium is from the valve port (101) to the end cap (20), the silencing component (30) moves to the closed position, the end cap (20) closes the porous silencing part (304), and the working medium flows along the second channel (50) and the first channel (40); when the flow direction of the working medium is from the end cap (20) to the valve port (101), the silencing component (30) moves to the open position, the porous silencing part (304) opens, and the working medium can pass through the porous silencing part (304) and then flow along the first channel (40).
2. The expansion valve according to claim 1, characterized in that, The valve body assembly (10) has a stepped surface (15) facing the silencing assembly (30). When the silencing assembly (30) moves to the open position, the silencing assembly (30) abuts against the stepped surface (15), and the second channel (50) is closed.
3. The expansion valve according to claim 1, characterized in that, The silencing assembly (30) includes a connecting sleeve (33), and the connecting sleeve (33) and the valve body assembly (10) form the second channel (50); The porous silencing part (304) is configured as a silencing block (34), which is installed on the connecting sleeve (33). The connecting sleeve (33) has a first port (31) facing the valve port (101) and a second port (32) facing away from the valve port (101). When the silencing component (30) is in the open position, the second port (32) is spaced apart from the end cap (20). When the silencing component (30) is in the closed position, the second port (32) is closed by the end cap (20).
4. The expansion valve according to claim 3, characterized in that, The connecting sleeve (33) has a first through hole that passes through both ends of itself, and the first through hole constitutes the second channel (50); Alternatively, the connecting sleeve (33) may have a first notch (332b), and the first notch (332b) and the valve body assembly (10) may form a second channel (50); Alternatively, the inner wall of the valve body assembly (10) has a recess that surrounds the connecting sleeve (33) to form the second channel (50).
5. The expansion valve according to claim 4, characterized in that, When the flow direction of the working medium is from the valve port (101) to the end cap (20), after the working medium flows from the valve port (101), a part of the working medium first enters the interior of the connecting sleeve (33) through the first port (31), and the other part of the working medium flows to the first through hole or the first notch (332b), and then the working medium flows through the first channel (40). When the working medium flows from the end cap (20) to the valve port (101), the working medium first passes through the first channel (40), then through the porous silencing part (304), and flows to the valve port (101).
6. The expansion valve according to claim 3, characterized in that, The silencing assembly (30) further includes a bracket (35), and the number of silencing blocks (34) is configured to be multiple. The multiple silencing blocks (34) are spaced apart along the flow direction of the working medium, and the bracket (35) is located between two of the silencing blocks (34).
7. The expansion valve according to claim 3, characterized in that, One of the valve body assembly (10) and the connecting sleeve (33) is provided with a guide rail (14), and the other is provided with a guide groove (334). The guide rail (14) and the guide groove (334) are in movable cooperation along the opening and closing direction of the muffler assembly (30).
8. The expansion valve according to claim 3, characterized in that, The end cap (20) has a groove (21) which is disposed toward the noise reduction assembly (30); When the silencing component (30) is in the closed position, the second port (32) abuts against the bottom wall of the groove (21) or blocks the opening of the groove (21); when the silencing component (30) is in the open position, the second port (32) disengages from the groove (21).
9. The expansion valve according to claim 1, characterized in that, When the flow direction of the working medium is from the valve port (101) to the end cap (20), the working medium can push the silencing component (30) from the open position to the closed position; when the flow direction of the working medium is from the end cap (20) to the valve port (101), the working medium can push the silencing component (30) from the closed position to the open position.
10. The expansion valve according to claim 9, characterized in that, When the end cap (20) and the silencing assembly (30) are vertically arranged, the diameter of the valve port (101) is d, the mass of the silencing assembly (30) is m, and when the flow direction of the working medium is from the end cap (20) to the valve port (101), the pressure difference across the silencing assembly (30) is y, and m < πd 2 y / 4g, where 0.2Mpa≤y≤3.5Mpa.
11. The expansion valve according to claim 1, characterized in that, 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 disposed on 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 interface section (111) is disposed on the side wall of the main valve body (11), and the second interface section (112) is disposed at one end of the main valve body (11) along its own axial direction. The first connector (12) is connected to the first interface segment (111) to form the first side (102), and the second connector (13) is connected to the second interface segment (112) to form the second side (103).
12. The expansion valve according to claim 1, characterized in that, The flow area of the valve port (101) is S1, the flow area of the second channel (50) is S2, and S1 < S2 ≤ 3S1.
13. The expansion valve according to claim 1, characterized in that, The end cap (20) is fixed to the valve body assembly (10) by laser welding, brazing, or riveting.