Electronic expansion valve

Abstract

The utility model relates to the field of refrigeration system especially relates to an electronic expansion valve. Electronic expansion valve includes valve pipe, valve seat, valve core and silencer, and valve seat is connected with valve pipe, and cooperation forms valve cavity, and the first interface, second interface and valve port are seted up on valve seat, and valve port is located between the first interface and second interface, and the first interface is communicated with valve cavity, and second interface is communicated with valve cavity through valve port, and the medium in valve cavity has the first flow direction from the first interface to second interface, valve core is movably arranged in valve cavity, and can move relative to valve port to adjust the flow of valve port, silencer is seted up between valve port and first interface and is located on the flow path of medium, and a plurality of silencer sound channels are seted up on silencer. Its advantage lies in, a plurality of silencer sound channels are seted up on silencer, can reduce flow velocity, refine bubble in advance before refrigerant enters valve port, effectively restrain the bubble breakage noise caused by the pressure sudden change before valve, realize continuous and obvious noise reduction effect.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration systems, and in particular to an electronic expansion valve. Background Technology

[0002] An electronic expansion valve typically includes a sleeve, a valve seat, and a valve core. The valve core is installed inside the valve seat, which has a valve cavity and a valve port passage. The valve core can move along the axial direction of the electronic expansion valve to regulate the flow rate of the electronic expansion valve.

[0003] The electronic expansion valve is a bidirectional flow valve. When the flow direction of the medium inside the valve is from the valve cavity to the valve port, the flow area of ​​the valve port channel is relatively small. Before the medium passes through the valve port channel for throttling, a sudden pressure change will occur near the valve port channel. When the medium contains air bubbles due to insufficient subcooling or other problems, the air bubbles will burst near the valve port channel, thus generating noise. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an electronic expansion valve.

[0005] An electronic expansion valve includes: a valve tube; a valve seat assembly connected to the valve tube and forming a valve cavity, the valve seat assembly having a first interface, a second interface, and a valve port, the valve port being located between the first interface and the second interface, the first interface communicating with the valve cavity, the second interface communicating with the valve cavity through the valve port, the medium in the valve cavity having a first flow direction from the first interface to the second interface; a valve core movably disposed in the valve cavity and movable relative to the valve port to adjust the flow rate at the valve port; and a silencing element disposed between the valve port and the first interface, wherein when the flow direction of the medium in the valve cavity is the first flow direction, the medium flows sequentially through the silencing element and the valve port, the silencing element comprising at least a multi-hole section, the silencing element having a clearance hole for the valve core to pass through.

[0006] With this configuration, the valve tube, valve seat, and valve core work together to form an electronic expansion valve structure. The movement of the valve core enables flow regulation between itself and the valve port located on the valve seat. The medium flows towards the valve port along the primary flow direction and is throttled at the valve port. A silencer is installed before the valve port, and this silencer has a porous section. This porous section reduces the flow rate and refines the air bubbles before the refrigerant enters the valve port, effectively suppressing the noise caused by sudden changes in upstream pressure leading to bubble rupture, achieving a continuous and significant noise reduction effect.

[0007] In one embodiment, the valve seat assembly includes a valve seat, and the silencer is connected to the valve seat.

[0008] In one embodiment, the valve seat has a mounting groove on the side facing the valve pipe, and the silencer is connected to the groove wall of the mounting groove.

[0009] In one embodiment, the valve core is axially movable relative to the relief hole, the relief hole being clearance-fitted with the valve core.

[0010] In one embodiment, the clearance between the relief hole and the valve core is 0.01mm-1.5mm on one side.

[0011] In one embodiment, the valve seat includes a body and a valve seat core, the body and the valve seat core are separately disposed, the valve port is constructed on the valve seat core, the silencing element is connected to the body, and the silencing element is located on the side of the valve port near the valve cavity.

[0012] In one embodiment, the valve seat includes a body and a valve seat core, the body and the valve seat core are separately disposed, the valve port is constructed on the valve seat core, the silencing element is connected to the valve seat core, and two silencing elements are provided, which are respectively connected to the two ends of the valve seat core in the axial direction.

[0013] In one embodiment, the valve seat core extends toward the valve tube, and a connecting hole is provided on the side wall of the valve seat core. The silencing component is configured as a first silencing component and a second silencing component, with the first silencing component disposed on the side of the connecting hole near the valve tube.

[0014] In one embodiment, the valve seat assembly includes a drive member, a valve seat, and a mounting member. The valve seat is connected to the drive member, the valve core passes through the drive member, the mounting member is disposed in the valve cavity and is fixedly connected to the valve seat, and the silencer is connected to the mounting member.

[0015] In one embodiment, the mounting component is configured as a sleeve, which is connected to the valve seat. The sleeve is hollow and communicates with the valve cavity, and the silencer is connected to the sleeve.

[0016] In one embodiment, a connecting hole is provided on the side wall of the sleeve, and the valve chamber communicates with the interior of the sleeve through the connecting hole. Along the axial direction of the sleeve, the end of the sleeve near the driving member abuts against the driving member.

[0017] In one embodiment, the silencing element is disposed on the side of the connecting hole near the valve port.

[0018] In one embodiment, the silencing component is integrally formed with the sleeve or is a separate component.

[0019] In one embodiment, the sleeve is integrally formed with the drive component.

[0020] In one embodiment, the mounting component is configured as a bracket, the bracket is connected to the valve seat assembly, the side of the bracket away from the valve port is spaced apart from the drive component, and the silencer is connected inside the bracket.

[0021] In one embodiment, at least two noise-reducing components are provided, and along the axial direction of the mounting component, two noise-reducing components are respectively connected to both ends of the mounting component.

[0022] In one embodiment, the silencer is fixedly connected to the valve core.

[0023] In one embodiment, the electronic expansion valve is configured to have a fully open state and a fully closed state in response to axial movement of the valve core. The valve seat assembly has a mounting groove for accommodating the muffler. The outer wall of the muffler can be clearance-fitted with the groove wall of the mounting groove. The clearance between the outer wall of the muffler and the groove wall of the mounting groove is 0.01mm-1.5mm on one side.

[0024] In one embodiment, the muffler does not detach from the mounting groove axially during the movement of the valve core.

[0025] In one embodiment, the distance between the silencer and the plane where the valve port is located is h, which satisfies: 0.25mm≤h≤6mm.

[0026] In one embodiment, the silencing component has multiple rectifier holes.

[0027] In one embodiment, the upper end face of the silencer near the valve tube is located below the axis of the first interface.

[0028] In one embodiment, the distance between the silencer and the plane where the valve port is located is h, and the inner diameter of the valve port is d, satisfying: (1 / 4)π×d^2≥dπh.

[0029] Compared to existing technologies, the electronic expansion valve provided by this utility model effectively reduces the flow rate, refines and eliminates air bubbles before refrigerant throttling by setting a silencing component with a multi-hole silencing channel close to the valve port, and cooperating with a flow guiding and fixing structure such as a sleeve and bracket. This suppresses the noise caused by air bubble rupture at the valve port due to sudden pressure changes. At the same time, the compact layout improves structural stability and assembly efficiency, thus achieving stable noise reduction of the electronic expansion valve. Attached Figure Description

[0030] Figure 1A schematic diagram of the structure of an embodiment of the electronic expansion valve provided by this utility model;

[0031] Figure 2 A schematic diagram of the structure of a second embodiment of the electronic expansion valve provided by this utility model;

[0032] Figure 3 A schematic diagram of the structure of the electronic expansion valve provided by this utility model in Embodiment 3;

[0033] Figure 4 A schematic diagram of the structure of Embodiment 4 of the electronic expansion valve provided by this utility model;

[0034] Figure 5 A schematic diagram of the structure of Embodiment 5 of the electronic expansion valve provided by this utility model;

[0035] Figure 6 A schematic diagram of the structure of Embodiment Six of the electronic expansion valve provided by this utility model;

[0036] Figure 7 A schematic diagram of the structure of Embodiment 7 of the electronic expansion valve provided by this utility model;

[0037] Figure 8 A schematic diagram of the structure of embodiment eight of the electronic expansion valve provided by this utility model;

[0038] Figure 9 A schematic diagram of the structure of Embodiment Nine of the electronic expansion valve provided by this utility model;

[0039] Figure 10 A schematic diagram of the structure of Embodiment 10 of the electronic expansion valve provided by this utility model;

[0040] Figure 11 A schematic diagram of the structure of Embodiment Eleven of the electronic expansion valve provided by this utility model;

[0041] Figure 12 A schematic diagram of the structure of embodiment 12 of the electronic expansion valve provided by this utility model;

[0042] Figure 13 This is a schematic diagram of one embodiment of the noise reduction component provided by this utility model.

[0043] The symbols in the diagram represent the following meanings:

[0044] 100. Electronic expansion valve; 10. Valve pipe; 20. Valve seat assembly; 21. Valve cavity; 211. Conical groove; 22. Valve seat; 221. First interface; 222. Second interface; 223. Valve port; 224. Mounting groove; 225. Main body; 226. Valve seat core; 227. Protrusion; 23. Drive component; 30. Valve core; 40. Silencing component; 41. First silencer component; 42. Second silencer component; 43. Clearance hole; 44. Multi-hole section; 441. Flow hole; 50. Sleeve; 51. Connecting hole; 60. Bracket; 70. Connecting pipe. Detailed Implementation

[0045] 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.

[0046] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] Please see Figures 1-12 This utility model provides an electronic expansion valve 100, in which a silencing component 40 is provided on the flow path of the medium before the medium enters the valve port 223 and is throttled, so as to reduce the noise of the medium by means of the silencing component 40.

[0051] The electronic expansion valve 100 includes a valve tube 10, a valve seat assembly 20, a valve core 30, and a silencer 40. The valve seat assembly 20 is connected to the valve tube 10 and forms a valve cavity 21. The valve seat assembly 20 has a first interface 221, a second interface 222, and a valve port 223. The valve port 223 is located between the first interface 221 and the second interface 222. The first interface 221 communicates with the valve cavity 21, and the second interface 222 communicates with the valve cavity 21 through the valve port 223. The medium in the valve cavity 21 has a flow path from the first interface 221 to the second interface 222. The first flow direction from port 221 to the second port 222; the valve core 30 is movably disposed in the valve cavity 21 and can move relative to the valve port 223 to adjust the flow rate at the valve port 223; the silencing component 40 is disposed between the valve port 223 and the first port 221. When the flow direction of the medium in the valve cavity 21 is the first flow direction, the medium flows through the silencing component 40 and the valve port 223 in sequence. The silencing component 40 includes a multi-hole section 44 and a clearance hole 43 is provided on the silencing component 40 for the valve core 30 to pass through.

[0052] It should be explained that the medium flows along the first flow direction, that is, it flows into the valve chamber 21 from the first port 221, passes through the silencer 40 and the valve port 223 in the valve chamber 21, and then flows out from the second port 222. This ensures that the medium can be rectified or have air bubbles in it refined by the porous structure on the silencer 40 before entering the valve port 223 to be throttled. However, as a bidirectional throttling valve, the electronic expansion valve 100 can also allow the medium to flow in the opposite direction, that is, in the opposite direction to the first flow direction, which is defined here as the second flow direction. When the medium flows along the second flow direction, the silencer 40 can also be located on the other side of the valve port 223.

[0053] As configured above, the valve pipe 10, valve seat assembly 20, and valve core 30 cooperate to form the structure of the electronic expansion valve 100. The movement of the valve core 30 enables flow regulation between it and the valve port 223 opened on the valve seat assembly 20. The medium flows towards the valve port 223 along the first flow direction and is throttled at the valve port 223. In the first flow direction, a silencing component 40 is provided before the valve port 223, and the silencing component 40 is constructed with a porous section 44. The porous section 44 can rectify and refine the refrigerant bubbles in advance before the refrigerant enters the valve port 223, effectively suppressing the noise of bubble rupture caused by sudden changes in pressure before the valve, and achieving a continuous and obvious noise reduction effect.

[0054] In this embodiment, the perforated section 44 can be configured in various ways. The silencing component 40 is provided with the aforementioned clearance hole 43, which is coaxially arranged with the valve core 30. The clearance hole 43 allows the valve core 30 to pass through, avoiding interference with the axial movement of the valve core 30 along the electronic expansion valve 100 to cooperate with the valve port 223 for flow regulation.

[0055] The area surrounding the clearance hole 43 is the porous section 44, which has a porous structure that can form multiple noise reduction channels to rectify or refine the bubbles of the medium flowing down to the valve.

[0056] In one specific embodiment of this application, the porous segment 44 can be a filter sintered block; please refer to [link / reference]. Figure 13 The filter screen sintered block is woven from metal or alloy wires, and then sintered together by high-temperature heating to form a uniform block filter material with high strength and stability, effectively refining air bubbles. Furthermore, a flow hole 441 can be provided on the silencing component 40 outside the clearance hole 43 to avoid throttling at the location of the silencing component 40, thereby improving the flow capacity of the electronic expansion valve 100. Specifically, the flow hole 441 can be formed between the edge of the porous section 44 and the clearance hole 43; alternatively, a notch can be provided at the edge of the porous section 44, the form of the hole or notch is not limited.

[0057] In another embodiment of this application, the porous segment 44 can be formed by openings in a solid plate-like structure other than the relief hole 43 to create a rectifier hole. Specifically, the silencing member 40 includes a metal plate-like member, and the porous segment 44 can be formed in a location other than the relief hole 43 by stamping or laser cutting to form a silencing channel.

[0058] The valve seat assembly 20 includes a valve seat 22, which is fixedly connected to the valve tube 10 to form a valve cavity 21.

[0059] Furthermore, the valve seat assembly 20 also includes a drive member 23, which is connected to the end of the valve seat 22 near the valve tube 10. The drive member 23 can be threadedly engaged with the valve core 30 to allow the valve core 30 to move axially along the electronic expansion valve 100. In addition, in some embodiments, the drive member 23 can also facilitate the installation of the muffler 40, which will be described in detail below and will not be repeated here.

[0060] In this embodiment, the drive component 23 is a nut, which is threadedly engaged with the valve core 30.

[0061] The silencing component 40 also has multiple implementation methods, which will be described in detail here.

[0062] Please see Figure 1 In Embodiment 1, the silencer 40 is disposed at the valve port 223, and the valve seat 22 has an installation groove 224 on the side facing the valve pipe 10. The silencer 40 is connected to the groove wall of the installation groove 224. Thus, by directly installing the silencer 40 into the installation groove 224 at the valve port 223, the silencer structure is placed close to the valve port 223, shortening the distance between the silencer 40 and the valve port 223. This ensures timely removal of air bubbles before medium throttling, enhancing the immediacy of noise reduction. Simultaneously, the groove wall connection improves structural stability. The installation groove 224 is directly formed on the valve seat 22, resulting in a simple and stable structure. In this Embodiment 1, the silencer 40 can be directly fixed to the valve seat assembly 20 by press-fitting or welding.

[0063] In this first embodiment, the silencer 40 and the valve port 223 channel of the valve seat 22 are spaced apart on the plane facing the valve cavity 21, so as to avoid the throttling at the position of the silencer 40 due to the distance being too close, which would affect the flow performance of the electronic expansion valve 100 and achieve a balance between noise reduction and flow rate.

[0064] Furthermore, the plane of the silencer 40 facing the valve cavity 21 can be flush with the plane of the valve seat 22 facing the valve cavity 21 to make the flow of the medium smoother.

[0065] Please see Figure 2 In Embodiment 2, the valve seat 22 includes a separate main body 225 and a valve seat core 226. The valve seat core 226 is connected to the main body 225 and is located inside the main body 225. The valve port 223 is opened in the valve seat core 226. Thus, the valve seat 22 adopts a separate design, including the main body 225 and the valve seat core 226, which facilitates processing and assembly. It allows the valve seat core 226 to be independently optimized to improve the accuracy and durability of the valve port 223, while simplifying the installation process of the silencer 40 and improving production efficiency and maintenance convenience.

[0066] Understandably, this second embodiment is a split-type design. In other embodiments, the valve seat 22 can also be configured as a one-piece structure, thereby simplifying the assembly process and reducing costs. Furthermore, in other embodiments described below, the valve seat 22 can be provided with an integrated valve port 223, that is, the valve port 223 is directly opened on the one-piece valve seat 22. Alternatively, it can be configured as the split-type valve port 223 described above, that is, the valve seat 22 includes a main body 225 and a valve seat core 226, and the valve port 223 is opened on the valve seat core 226.

[0067] In this second embodiment, the valve seat 22 still has a mounting groove 224, which is located on the side of the valve seat core 226 near the valve cavity 21. A step is provided on the side wall of the mounting groove 224, supporting and limiting the silencer 40, ensuring that the silencer 40 maintains a certain distance from the plane of the opening of the valve port 223 channel facing the valve cavity 21. The valve core 30 can pass through the clearance hole 43 on the silencer 40 and extend into the valve port 223 on the valve seat core 226. It should be explained that the valve port 223 channel refers to the channel structure formed in the valve seat 22 that allows the medium to flow and communicates with the valve port 223. The valve core 30 can extend into the valve port 223 channel through the valve port 223, and the medium can enter and exit the valve cavity 21 through the valve port 223 channel.

[0068] Further, please see Figure 3 In Embodiment 3, the valve seat 22 is similar to that in Embodiment 2, still including a separate main body 225 and a valve seat core 226. The valve seat core 226 is connected to the main body 225 and located inside the main body 225, with the valve port 223 opening in the valve seat core 226. The difference lies in the placement of the silencing component 40. The valve seat core 226 forms a mounting groove 224 facing the valve cavity 21, and the silencing component 40 is disposed within the mounting groove 224 of the valve seat core 226, and is axially spaced from the plane containing the opening of the valve port 223 facing the valve cavity 21. Specifically, a step is formed on the side of the valve seat core 226 facing the valve cavity 21, and the silencing component 40 is connected to the step. In this way, the relative position of the silencing component 40 and the valve port 223 can be precisely controlled, optimizing the fluid flow channel layout, ensuring noise reduction while avoiding interference with the movement of the valve core 30, and improving the reliability of the valve. Furthermore, the valve seat 22 has a through hole extending along the axial direction, the valve seat core 226 is installed in the through hole, and one end of the valve seat core 226 is directly connected to the valve cavity 21, while the other end extends into the connecting pipe 70.

[0069] Specifically, in this third embodiment, the distance h between the silencing component 40 and the plane containing the opening of the valve port 223 channel facing the valve cavity 21 satisfies: 0.25mm ≤ h ≤ 6mm. This limits the distance h between the silencing component 40 and the plane containing the opening of the valve port 223 channel facing the valve cavity 21 to within the range of 0.25mm to 6mm, ensuring that the silencing block is sufficiently close to the valve port 223 to effectively capture and refine the air bubbles before the valve, preventing bubble bursts and noise generation. Simultaneously, it avoids the throttling performance being affected by excessively close proximity, achieving a balance between noise reduction and flow rate.

[0070] In another embodiment, the distance between the silencer 40 and the plane where the opening of the valve port 223 is located on the side facing the valve cavity 21 is set as h, and the diameter of the valve port 223 is d. Then, (1 / 4)π×d^2≥dπh is satisfied, thereby ensuring that the upstream silencer 40 does not throttle.

[0071] Alternatively, in this third embodiment, two silencers 40 can be configured, each located at one end of the valve seat core 226. Specifically, the two silencers 40 are positioned on opposite sides of the valve port 223 along the axial direction of the electronic expansion valve 100, one end near the valve cavity 21 and the other near the second interface 222. This creates a dual noise reduction structure. Firstly, in the first flow direction, continuous noise reduction is applied to the refrigerant before and after throttling, significantly reducing the noise level throughout the flow path. Specifically, before the refrigerant flows through the valve port 223, the noise caused by the sudden pressure drop near the valve port 223 is mitigated. After the refrigerant flows through the valve port 223, if bubbles are generated due to throttling at the valve port 223, the downstream silencers 40 can further refine the bubbles, thereby reducing noise. On the other hand, when the medium needs to flow in reverse, the silencer 40 located near the second port 222 can also pre-buffer and refine the bubbles of the medium flowing down to the valve and then allow the medium to enter the valve port 223 and flow into the valve chamber 21.

[0072] Preferably, please continue to see Figure 3The silencer 40 is connected to the valve seat 22, and along the axial direction of the valve core 30, the plane of the silencer 40 near the valve pipe 10 is lower than the lowest axial position of the inner wall of the opening of the first interface 221 or the connected pipe 70. Thus, the silencer 40 is positioned below the lowest position of the inner wall of the opening of the first interface 221 or the connected pipe 70, allowing the medium flowing in from the first interface 221 to accumulate refrigerant through the aforementioned axial positional difference and guide the fluid towards the silencer 40 for a smooth flow, enhancing the bubble refinement effect and further reducing the noise from bubble bursting at the valve port 223. Simultaneously, the flow-guiding structure improves noise reduction efficiency. Furthermore, the side of the valve seat core 226 near the valve cavity 21 is lower than the bottom surface of the valve seat 22 forming the valve cavity 21, and at least one inner wall of the valve cavity 21 has a conical groove 211, further enhancing the flow-guiding effect of the valve seat assembly 20 to reduce noise. It should be explained that the aforementioned axial drop is not limited to the separate valve seat core 226 structure; the same limitation can also be applied to the integrally set valve seat 22.

[0073] Please see Figure 4 In this fourth embodiment, the valve seat core 226 extends toward the valve cavity 21 and is spaced apart from the drive member 23. A connecting hole 51 is provided on the valve seat core 226. The difference between the fourth and third embodiments is that the valve seat core 226 extends toward the valve cavity 21 and extends all the way to the lowest axial position of the inner wall above the opening of the first interface 221 or the connecting pipe 70 connected to it. In this way, the refrigerant is prevented from flowing downward and directly impacting the valve core 30. At the same time, an annular flow channel can be formed between the inner walls of the valve seat core 226 and the valve seat 22 to buffer and slow down the refrigerant and help reduce noise. Furthermore, a connecting hole 51 is provided on the side of the valve seat core 226 that protrudes toward the valve cavity 21 to prevent throttling at the silencer 40, thereby improving the flow capacity of the electronic expansion valve 100.

[0074] Please see Figure 4 The top of the valve seat core 226 is spaced apart from the drive component 23, so the refrigerant can enter the valve seat core 226 vertically through the opening at the top of the valve seat core 226. The silencer 40 is located at the open end of the valve seat core 226. Some media enter the valve seat core 226 horizontally through the connecting hole 51, and some media flow into the valve seat core 226 after being reduced in noise by the silencer 40 through the open end of the valve seat core 226. The two media with different flow directions merge in the valve seat core 226 and are buffered by the cavity between the valve seat core 226 and the silencer 40 before flowing to the valve port 223 for further noise reduction.

[0075] Furthermore, at least one end of the valve seat core 226 facing the valve cavity 21 in the axial direction is provided with a silencing element 40, and at least one connecting hole 51 is located between the silencing element 40 and the valve port 223. The silencing element 40 and the sleeve 50 are separately provided. The separate or integrated design provides manufacturing flexibility, facilitates structural optimization according to requirements, and improves production efficiency and noise reduction performance.

[0076] In this fourth embodiment, optionally, both the upper and lower ends of the valve seat core 226 are provided with silencing components 40, which also form a double noise reduction and optimize the noise reduction effect. Furthermore, when the medium flows in reverse, it can also play a role in pre-buffering and noise reduction for the medium.

[0077] The silencer 40 is specifically configured as a first silencer 41 and a second silencer 42. The first silencer 41 is installed on the upper end of the valve seat core 226 and has a clearance hole 43. The second silencer 42 is located at the lower end of the valve seat core 226. The first silencer 41 and the second silencer 42 are respectively located on the upper and lower sides of the valve port 223.

[0078] In addition to directly mounting the silencer 40 on the valve seat 22, this application can also mount a mounting component on the valve seat 22. The silencer 40 is fixedly connected to the valve seat 22 by being mounted on the mounting component, and independent machining simplifies the manufacturing process. Furthermore, the mounting component can provide additional noise reduction technical effects, which will be described in detail below. The silencer 40 can be configured as a sleeve 50 or a bracket 60.

[0079] Please see Figure 5 In Embodiment 5, a sleeve 50 is provided on the outer periphery of the valve core 30. The top end of the sleeve 50 is spaced apart from or abuts against the drive member 23. Preferably, the top end of the sleeve 50 abuts against the drive member 23, so the medium can no longer enter the interior of the sleeve 50 through the opening at one end of the sleeve 50 toward the valve tube 10. Therefore, a connecting hole 51 can be opened on the side wall of the sleeve 50 to allow the medium to enter the valve cavity 21. In Embodiment 5, the silencing member 40 is provided at the end of the sleeve 50 near the valve port 223, and along the axial direction of the sleeve 50, the silencing member 40 is located below the connecting hole 51. Therefore, the medium must pass through the connecting hole 51 and then through the silencing member 40. The medium will be initially decelerated at the connecting hole 51. After the medium is decelerated, it passes through the silencing member 40, resulting in less noise, which optimizes the noise effect.

[0080] Furthermore, the axis of the connecting hole 51 and the axis of the first interface 221 are staggered, so that when the medium enters from the first interface 221, it will not directly enter the inside of the sleeve 50 through the connecting hole 51, thereby preventing the medium from impacting the valve core 30 inside the sleeve 50.

[0081] In this fifth embodiment, preferably, the end of the sleeve 50 that is axially close to the valve tube 10 abuts against the drive member 23, and the end of the electronic expansion valve 100 that is axially away from the valve tube 10 abuts against the valve seat 22.

[0082] Optionally, the valve seat 22 is integrally formed, with a valve port 223 directly formed on the valve seat 22. The valve core 30 passes through the clearance holes 43 on the drive member 23 and the silencer 40 along the axial direction, respectively, and cooperates with the valve port 223 to achieve flow regulation. In other embodiments of this application, a separate valve seat core 226 can also be provided to form the valve seat 22 to abut against the end of the sleeve 50 away from the valve tube 10, according to actual needs.

[0083] There are multiple ways to fix the muffler 40 and the sleeve 50. For example, a step can be set on the inner wall of the sleeve 50 and the muffler 40 can be fixed on the step, or the muffler 40 and the sleeve 50 can be directly pressed together or welded together.

[0084] Furthermore, the clearance between the relief hole 43 and the valve core 30 on one side is 0.01mm-1.5mm. This allows the valve core 30 to move smoothly along the axial direction through the relief hole 43, reducing the difficulty of the machining process and allowing for certain machining tolerances. At the same time, it prevents the medium from directly passing through the relief hole 43 and the silencer 40 if the clearance is too large, thus preventing it from affecting the noise reduction effect of the silencer 40.

[0085] Understandably, in the context of multiple embodiments, when the valve core 30 and the silencer 40 are in clearance fit, the embodiment can inherit the above-mentioned single-sided clearance size optimization setting.

[0086] Please see Figure 6 In Embodiment Six, a sleeve 50 is provided on the valve seat 22. The structural features of the sleeve 50 are similar to those in Embodiment Five. The top end of the sleeve 50 abuts against the drive member 23, and the lower end of the sleeve 50 extends into the mounting groove 224 opened on the valve seat 22. The groove wall of the mounting groove 224 has a limiting effect on the sleeve 50. A connecting hole 51 is opened on the side wall of the sleeve 50. Since the top end of the sleeve 50 abuts against the drive member 23, the medium cannot enter the interior of the sleeve 50 through the top opening of the sleeve 50, but must enter the interior of the sleeve 50 through the connecting hole 51. At this time, the silencing member 40 is set on the lower side of the connecting hole 51 along the axial direction of the sleeve 50, thereby ensuring that the medium will inevitably pass through the silencing member 40 after passing through the connecting hole 51.

[0087] Furthermore, the valve seat 22 is provided with a protrusion 227 at the first interface 221. The transversely arranged pipe 70 abuts against the protrusion 227 to improve positional stability and ensure that the pipe 70 does not extend excessively into the valve cavity 21. At the same time, the protrusion 227 can also abut against the outer wall of the sleeve 50 located inside the valve cavity 21, thus ensuring that the position of the sleeve 50 is fixed and preventing the position of the sleeve 50 from shifting after frequent impacts of the medium.

[0088] Please see Figure 7In embodiment seven, a sleeve 50 is still provided on the valve seat 22. The muffler 40 and the sleeve 50 are integrally formed, that is, the lower end of the sleeve 50 is directly integrally cast into a muffler 40. At least part of the muffler 40 is located above the mounting groove 224 of the valve seat 22. The muffler 40 is formed into a porous structure directly through die casting, thereby forming multiple muffler channels, simplifying the processing steps, reducing the assembly difficulty, and reducing the number of parts. Preferably, the top end of the sleeve 50 abuts against the drive member 23, and the lower end of the sleeve 50 extends into the mounting groove 224 opened on the valve seat 22. The groove wall of the mounting groove 224 has a limiting effect on the sleeve 50. Further, a connecting hole 51 is opened on the side wall of the sleeve 50. Since the top end of the sleeve 50 abuts against the drive member 23, the medium cannot enter the interior of the sleeve 50 through the top opening of the sleeve 50. Therefore, it can enter the interior of the sleeve 50 through the connecting hole 51. The silencer 40 has a relief hole 43, the valve port 223 is formed on the valve seat 22, and the valve core 30 passes through the relief hole 43 and the valve port 223 to achieve flow regulation.

[0089] Please see Figure 8 In embodiment eight, a bracket 60 is provided inside the valve cavity 21, that is, the mounting component is set as a bracket 60. The bracket 60 is connected to the valve seat 22, and both ends of the bracket 60 along its own axial direction are respectively connected to the valve cavity 21 and the valve port 223. The muffler 40 is connected inside the bracket 60. In this way, the muffler 40 is connected by the bracket 60, and the bracket 60 is recessed towards the second interface 222, providing a stable support structure, ensuring that the muffler 40 is accurately positioned, avoiding falling off or shifting, while simplifying the assembly process, reducing welding requirements, and improving production efficiency and structural reliability.

[0090] Specifically, the bracket 60 is preferably made of metal and is directly press-fitted into the inner wall of the valve seat 22 without the need for additional welding. In this embodiment eight, the assembly of the bracket 60 and the silencer 40 can be completed as a separate step off-line to improve production efficiency.

[0091] In this eighth embodiment, the valve seat 22 has a mounting groove 224, and a portion of the bracket 60 is disposed in the mounting groove 224, and its position is fixed through the mounting groove 224. The valve port 223 is located at the bottom of the mounting groove 224, and the bottom of the bracket 60 protrudes towards the valve port 223 and abuts against the mounting groove 224, thereby creating a gap h. This gap h can share the same technical feature as the h mentioned above. The upper part of the bracket 60 extends out of the mounting groove 224 and into the interior of the valve cavity 21, and the left horizontal pipe 70 can abut against the bracket 60. The upper end of the bracket 60 is spaced apart from the drive member 23, allowing the medium to smoothly enter the valve cavity 21 and flow from the valve cavity 21 to the interior space of the bracket 60, and then flow to the valve port 223 through the silencer 40.

[0092] The silencing component 40 can be fixed to the bracket 60 by welding or riveting.

[0093] Please see Figure 9 Compared to Embodiment 8, Embodiment 9 is provided with two layers of sound-absorbing components 40. The two sound-absorbing components 40 work together to further optimize the buffering and noise reduction effect.

[0094] Specifically, the bracket 60 is hollow inside, and two silencers 40 are both set inside the bracket 60 and spaced apart along the axial direction of the bracket 60. This allows the medium to be buffered and silenced by one layer of silencers 40, and then silenced again after a certain interval, resulting in better noise reduction effect.

[0095] Furthermore, the edge of the top opening of the bracket 60 extends radially inward to form an inward flange. The flange presses against the muffler 40 on the side near the valve cavity 21 to prevent the muffler 40 from coming off and falling into the valve cavity 21.

[0096] Please see Figure 10 In this embodiment ten, a sleeve 50 structure is provided inside the valve cavity 21, and the sleeve 50 structure is integrated with the drive component 23 as one unit. The sleeve 50 can be installed into the valve cavity 21 together with the drive component 23.

[0097] Specifically, in this embodiment, the silencer 40 is disposed at the valve port 223 facing the valve cavity 21. The valve seat 22 has a mounting groove 224 on the side facing the valve pipe 10, and the silencer 40 is connected to the groove wall of the mounting groove 224. The silencer 40 and the valve seat 22 are spaced apart on the plane where the valve port 223 is located, thus avoiding excessive distance that could affect throttling performance and achieving a balance between noise reduction and flow rate. The sleeve 50 extends from the drive member 23 towards the valve port 223 and abuts against the silencer 40, thereby axially pressing the silencer 40 to make its position more stable. Optionally, the plane of the silencer 40 facing the valve cavity 21 is flush with the plane of the valve seat 22 facing the valve cavity 21 to allow for smoother medium flow. Since the planes of the muffler 40, valve seat 22, and sleeve 50 are flush, the lower end of the sleeve 50 can abut against the muffler 40. Preferably, in this embodiment, the radially inner portion of the end of the sleeve 50 is pressed against the muffler 40, and the radially outer portion is pressed against the valve seat 22, so as to simultaneously achieve its own abutment and limit the movement of the muffler 40.

[0098] Please see Figure 11In this eleventh embodiment, a sleeve 50 is also provided. The sleeve 50 is integrated with the drive component 23 and can be installed into the valve cavity 21 together with the drive component 23. The silencer 40 is fixedly connected to the sleeve 50. Optionally, the silencer 40 is fixedly connected to the inner wall of the sleeve 50, and the silencer 40 is located on the side of the valve port 223 facing the valve cavity 21. Thus, the silencer 40 is fixed to the valve seat assembly 20 by being fixedly connected to the sleeve 50.

[0099] Furthermore, a mounting groove 224 can be formed on the side of the valve seat 22 facing the valve pipe 10, and the end of the sleeve 50 near the valve port 223 is confined to the groove wall of the mounting groove 224. The silencer 40 and the valve seat 22 are spaced apart on the plane where the valve port 223 channel faces the opening of the valve cavity 21, thereby avoiding the throttling performance being affected due to excessive distance, and achieving a balance between noise reduction and flow rate. Optionally, the plane of the silencer 40 facing the valve cavity 21 is flush with the plane of the valve seat 22 facing the valve cavity 21, so as to make the flow of the medium smoother.

[0100] Please see Figure 12 In this embodiment 12, the silencer 40 is not fixedly connected to the valve seat assembly 20, but is connected to the valve core 30. The silencer 40 and the valve core 30 are separately configured, which facilitates processing and assembly. The electronic expansion valve 100 is configured to have a fully open state and a fully closed state in response to the axial movement of the valve core 30. Optionally, the valve seat assembly 20 is provided with a mounting groove 224 that can accommodate the silencer 40. During the movement of the valve core 30, the silencer 40 will not completely disengage from the mounting groove 224 in the axial direction, so as to ensure that the refrigerant can flow sufficiently through the silencer 40 for noise reduction in the first flow direction.

[0101] A mounting groove 224 is provided on the valve seat 22, and a valve port 223 is provided at the bottom of the mounting groove 224. When the valve core 30 moves downward and abuts against the valve port 223, the muffler 40 will also move into the mounting groove 224. In this embodiment, when the valve core 30 is in the fully closed state, the upper surface of the muffler 40 will be lower than the valve port 223 of the mounting groove 224.

[0102] It should be explained that during the process of the electronic expansion valve 100 being fully open or fully closed, the distance between the silencer 40 and the plane where the valve port 223 channel faces the opening of the valve cavity 21 always meets the setting of h mentioned above, that is: 0.25mm≤h≤6mm.

[0103] Since the valve core 30 is directly connected to the silencer 40, there is no gap between the valve core 30 and the silencer 40, and they move synchronously along the axial direction of the electronic expansion valve 100. Similarly, the outer wall of the silencer 40 and the groove wall of the mounting groove 224 can slide with a clearance fit, and the single-sided gap between the outer wall of the silencer 40 and the mounting groove 224 meets the requirement of 0.01mm-1.5mm. This also facilitates the movement of the silencer 40 along the axial direction within the mounting groove 224, prevents interference between the outer wall of the silencer 40 and the groove wall of the mounting groove 224, allows for machining tolerances, reduces process difficulty, and also takes into account the flow of the medium, ensuring that the medium does not flow directly to the valve port 223 through the gap due to excessive gap.

[0104] Furthermore, the installation of the aforementioned muffler 40 can be completed by welding, riveting, or press-fitting. The muffler 40 has multiple rectifier holes, which act as sound-absorbing channels to optimize noise reduction.

[0105] The above embodiments define the axial positional relationship between the muffler 40 and the valve seat assembly 20. For example, in Embodiment 1, the plane of the muffler 40 facing the valve cavity 21 is defined to be flush with the plane of the valve seat 22 facing the valve cavity 21. In other flexible and applicable embodiments, the axial positional relationship between the muffler 40 and the valve seat assembly 20 is not limited to the specific embodiments.

[0106] Compared with the prior art, the electronic expansion valve 100 provided by this utility model effectively reduces the flow rate, refines and eliminates air bubbles before the refrigerant is throttled by setting a sound-absorbing component 40 with a multi-hole sound-absorbing channel close to the valve port 223, and cooperating with the flow guiding and fixing structure such as the sleeve 50 and the bracket 60. This suppresses the noise of air bubble rupture caused by sudden pressure changes at the valve port 223. At the same time, the compact layout improves the structural stability and assembly efficiency, thus achieving stable noise reduction of the electronic expansion valve 100.

[0107] The valve seat 22 of this application includes a main body 225 and a valve seat core 226, which can be integrated, separate, or combined.

[0108] 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.

[0109] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that, include: Valve tube (10); A valve seat assembly (20) is connected to the valve pipe (10) and forms a valve cavity (21). The valve seat assembly (20) is provided with a first interface (221), a second interface (222) and a valve port (223). The valve port (223) is located between the first interface (221) and the second interface (222). The first interface (221) is connected to the valve cavity (21). The second interface (222) is connected to the valve cavity (21) through the valve port (223). The medium in the valve cavity (21) has a first flow direction from the first interface (221) to the second interface (222). The valve core (30) is movably disposed within the valve cavity (21) and can move relative to the valve port (223) to regulate the flow rate at the valve port (223); A silencer (40) is disposed between the valve port (223) and the first interface (221). When the flow direction of the medium in the valve cavity (21) is the first flow direction, the medium flows through the silencer (40) and the valve port (223) in sequence. The silencer (40) includes at least a porous section (44). The silencer (40) is provided with a clearance hole (43) for the valve core (30) to pass through.

2. The electronic expansion valve according to claim 1, characterized in that, The valve seat assembly (20) includes a valve seat (22), and the silencer (40) is connected to the valve seat (22).

3. The electronic expansion valve according to claim 2, characterized in that, The valve seat (22) has an installation groove (224) on the side facing the valve pipe (10), and the silencer (40) is connected to the groove wall of the installation groove (224).

4. The electronic expansion valve according to claim 2, characterized in that, The valve core (30) is axially movable relative to the relief hole (43), and the relief hole (43) is clearance-fitted with the valve core (30).

5. The electronic expansion valve according to claim 4, characterized in that, The clearance between the clearance hole (43) and the valve core (30) is 0.01mm-1.5mm.

6. The electronic expansion valve according to claim 2, characterized in that, The valve seat (22) includes a main body (225) and a valve seat core (226), the main body (225) and the valve seat core (226) are separately disposed, the valve port (223) is constructed on the valve seat core (226), the silencing component (40) is connected to the main body (225), and the silencing component (40) is located on the side of the valve port (223) near the valve cavity (21).

7. The electronic expansion valve according to claim 2, characterized in that, The valve seat (22) includes a main body (225) and a valve seat core (226). The main body (225) and the valve seat core (226) are separately disposed. The valve port (223) is constructed on the valve seat core (226). The silencer (40) is connected to the valve seat core (226). There are two silencers (40), which are respectively connected to the two ends of the valve seat core (226) in the axial direction.

8. The electronic expansion valve according to claim 7, characterized in that, The valve seat core (226) extends toward the valve tube (10), and a connecting hole (51) is provided on the side wall of the valve seat core (226). The silencing component (40) is configured as a first silencing component (41) and a second silencing component (42). The first silencing component (41) is located on the side of the connecting hole (51) near the valve tube (10).

9. The electronic expansion valve according to claim 1, characterized in that, The valve seat assembly (20) includes a drive member (23), a valve seat (22) and a mounting member. The valve seat (22) is connected to the drive member (23), the valve core (30) passes through the drive member (23), the mounting member is disposed in the valve cavity (21) and is fixedly connected to the valve seat (22), and the silencer (40) is connected to the mounting member.

10. The electronic expansion valve according to claim 9, characterized in that, The mounting component is configured as a sleeve (50), which is connected to the valve seat (22). The sleeve (50) is hollow and communicates with the valve cavity (21). The silencer (40) is connected to the sleeve (50).

11. The electronic expansion valve according to claim 10, characterized in that, A connecting hole (51) is provided on the side wall of the sleeve (50). The valve chamber (21) is connected to the interior of the sleeve (50) through the connecting hole (51). Along the axial direction of the sleeve (50), the end of the sleeve (50) near the drive member (23) abuts against the drive member (23).

12. The electronic expansion valve according to claim 11, characterized in that, The silencing component (40) is disposed on the side of the connecting hole (51) near the valve port (223).

13. The electronic expansion valve according to claim 11, characterized in that, The silencing component (40) is integrally or separately disposed from the sleeve (50).

14. The electronic expansion valve according to claim 10, characterized in that, The sleeve (50) and the drive component (23) are integrally formed.

15. The electronic expansion valve according to claim 9, characterized in that, The mounting component is configured as a bracket (60), which is connected to the valve seat assembly (20). The side of the bracket (60) away from the valve port (223) is spaced apart from the drive component (23), and the silencer (40) is connected inside the bracket (60).

16. The electronic expansion valve according to claim 9, characterized in that, The silencing element (40) is provided in at least two parts, and along the axial direction of the mounting element, the two silencing elements (40) are respectively connected to the two ends of the mounting element.

17. The electronic expansion valve according to claim 1, characterized in that, The silencer (40) is fixedly connected to the valve core (30).

18. The electronic expansion valve according to claim 17, characterized in that, The electronic expansion valve is configured to have a fully open state and a fully closed state in response to the axial movement of the valve core (30). The valve seat assembly (20) is provided with a mounting groove (224) that can accommodate the muffler (40). The outer wall of the muffler (40) can be clearance-fitted with the groove wall of the mounting groove (224). The single-sided clearance between the outer wall of the muffler (40) and the groove wall of the mounting groove (224) is 0.01mm-1.5mm.

19. The electronic expansion valve according to claim 18, characterized in that, During the movement of the valve core (30), the silencer (40) will not detach from the mounting groove (224) in the axial direction.

20. The electronic expansion valve according to any one of claims 1-19, characterized in that, The distance between the silencer (40) and the plane where the valve port (223) is located is h, which satisfies: 0.25mm≤h≤6mm.

21. The electronic expansion valve according to any one of claims 1-19, characterized in that, The silencing component (40) has multiple rectifier holes.

22. The electronic expansion valve according to any one of claims 1-19, characterized in that, The upper end face of the silencer (40) near the valve pipe (10) is located on the lower side of the axis of the first interface (221).

23. The electronic expansion valve according to any one of claims 1-19, characterized in that, The distance between the plane where the silencing component (40) and the valve port (223) are located is h, and the inner diameter of the valve port (223) is d, which satisfies: (1 / 4)π×d^2≥dπh.

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