expansion valve

Abstract

The application relates to the technical field of valves, in particular to an expansion valve. The expansion valve comprises a valve body, a connecting pipe unit and a filter screen component. One end of the connecting pipe unit is connected to the valve body and communicates with the inside of the valve body. The filter screen component is installed in the connecting pipe unit and is used for filtering refrigerant flowing through the connecting pipe unit. The expansion valve provided by the application solves the problem that the internal structure of a traditional expansion valve is easily affected by impurities and is blocked during long-term operation.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to an expansion valve. Background Technology

[0002] The expansion valve is an important component in a refrigeration system. It controls the flow of refrigerant or achieves throttling by changing the opening of the valve port through a valve needle. However, the refrigerant in the system piping contains a certain amount of impurities. If these impurities enter the expansion valve, they can easily cause the internal structure of the expansion valve to jam during long-term operation. Utility Model Content

[0003] Therefore, it is necessary to provide an expansion valve to solve the problem that the internal structure of traditional expansion valves is easily affected and jammed by impurities during long-term operation.

[0004] This application provides an expansion valve, which includes a valve body, a connecting pipe unit, and a filter screen component. One end of the connecting pipe unit is connected to the valve body and communicates with the interior of the valve body. The filter screen component is installed inside the connecting pipe unit and is used to filter the refrigerant flowing through the connecting pipe unit.

[0005] In one embodiment, the filter component includes a filter screen with an area of ​​S, a mesh count of n, a wire diameter of d, and an effective area of ​​S1; the valve body has a valve port communicating with the connecting pipe unit, and the flow area of ​​the valve port is S2, wherein S1≥S2, and S1=(25.4 / nd). 2 ×S / (25.4 2 / n 2 ).

[0006] In one embodiment, the connecting unit includes a first connecting section and a second connecting section, with the two ends of the first connecting section connected to the valve body and the second connecting section, respectively; wherein the first connecting section and the second connecting section are separately arranged, and the filter screen is installed on the second connecting section.

[0007] In one embodiment, the maximum outer diameter of the second connecting pipe section is D1, the outer diameter of the valve body is D2, wherein D2 > D1; and / or, the inner diameter of the first connecting pipe section is D3, and the inner diameter of the connection between the second connecting pipe section and the filter screen component is D4, wherein D4 ≥ 2D3.

[0008] In one embodiment, the filter component includes a filter screen and a filter screen holder. The filter screen is installed on the filter screen holder and is installed on the connecting pipe unit through the filter screen holder. The connecting pipe unit is provided with a first limiting part, which is located at one end of the filter screen holder near the valve body and can abut against the filter screen holder along the axial direction of the connecting pipe unit.

[0009] In one embodiment, the sidewall of the second connecting pipe section protrudes towards its own axis to form the first limiting portion; or, along the axial direction of the connecting pipe unit, the sidewall of the second connecting pipe section gradually contracts towards the valve body to form the first limiting portion.

[0010] In one embodiment, the connecting unit further includes a connecting sleeve disposed between the first connecting segment and the second connecting segment, wherein the outer wall of the connecting sleeve is connected to the second connecting segment and the inner wall of the connecting sleeve is connected to the first connecting segment.

[0011] In one embodiment, the end face of the connecting sleeve away from the valve body forms the first limiting portion.

[0012] In one embodiment, the expansion valve further includes a silencing plate, which is configured as a porous component and is disposed within the connecting pipe unit; wherein the silencing plate is connected to the inner wall of the connecting pipe unit, or the silencing plate is connected to the inner wall of the filter screen seat, or the silencing plate is sandwiched between the filter screen seat and the first limiting portion along the axial direction of the connecting pipe unit.

[0013] In one embodiment, a flow channel is provided on the silencing plate, the flow channel passing through both ends of the silencing plate along its own axial direction; wherein, the sidewall of the flow channel is spaced apart from the sidewall of the silencing plate, or, the sidewall of the flow channel is at least partially connected to the sidewall of the silencing plate.

[0014] In one embodiment, the first connecting pipe section and the second connecting pipe section are welded together; wherein the filter screen holder is configured as a stainless steel component.

[0015] Compared with existing technologies, the expansion valve provided in this application, by incorporating a filter element within the connecting pipe unit connected to the valve body, effectively filters impurities in the refrigerant, preventing them from entering the valve body and causing structural jamming. This ensures the reliability of the expansion valve during use. Furthermore, since the expansion valve integrates its own filtration function, there is no need for the client to reinstall the filter structure, eliminating the need for welding and reducing costs. Attached Figure Description

[0016] 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.

[0017] Figure 1 A schematic diagram of the structure of an expansion valve according to an embodiment of this application;

[0018] Figure 2 A schematic diagram of the structure of an expansion valve according to another embodiment of this application;

[0019] Figure 3 A schematic diagram of the installation of a sound-absorbing plate according to an embodiment of this application;

[0020] Figure 4 A schematic diagram of the installation structure of the muffler plate according to another embodiment of this application;

[0021] Figure 5 A schematic diagram of the installation structure of a sound-absorbing plate according to another embodiment provided in this application;

[0022] Figure 6 A schematic diagram of the structure of a sound-absorbing plate according to an embodiment of this application;

[0023] Figure 7 A schematic diagram of the structure of a sound-absorbing plate according to another embodiment of this application.

[0024] The symbols in the diagram represent the following meanings:

[0025] 100. Expansion valve; 10. Valve body; 101. Valve cavity; 102. Valve port; 20. Pipeline unit; 21. First pipeline section; 22. Second pipeline section; 23. Connecting sleeve; 24. First limiting part; 25. Second limiting part; 26. Mounting part; 30. Filter screen assembly; 31. Filter screen; 32. Filter screen holder; 40. Silencing plate; 401. Flow channel. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The expansion valve is an important component in a refrigeration system. It controls the flow of refrigerant or achieves throttling by changing the opening of the valve port through a valve needle. However, the refrigerant in the system piping contains a certain amount of impurities. If these impurities enter the expansion valve, they can easily cause the internal structure of the expansion valve to jam during long-term operation.

[0032] Please see Figures 1-7To address the problem of traditional expansion valves easily becoming jammed due to impurities during long-term operation, this application provides an expansion valve 100. The expansion valve 100 includes a valve body 10, a connecting pipe unit 20, and a filter screen component 30. One end of the connecting pipe unit 20 is connected to the valve body 10 and communicates with the interior of the valve body 10. The filter screen component 30 is installed inside the connecting pipe unit 20 and is used to filter the refrigerant flowing through the connecting pipe unit 20.

[0033] It is understood that by installing a filter element 30 in the pipe unit 20 connected to the valve body 10, this application can filter impurities in the refrigerant, preventing impurities from entering the valve body 10 and causing structural jamming, thereby effectively ensuring the reliability of the expansion valve 100 during use. Furthermore, since the expansion valve 100 integrates its own filtration function, there is no need for the client to reinstall the filter structure, eliminating the need for welding and reducing costs.

[0034] Specifically, the valve body 10 has a valve cavity 101 and a valve port 102 communicating with the connecting pipe unit 20. In this embodiment, there are two connecting pipe units 20, which serve as the inlet and outlet of the refrigerant in the expansion valve 100, respectively. One connecting pipe unit 20 is connected to the side wall of the valve body 10 and communicates with the valve cavity 101, while the other connecting pipe unit 20 is located at the valve port 102 and connected to the valve body 10, so as to achieve communication with the valve cavity 101 through the valve port 102. Preferably, filter screen components 30 can be provided in both connecting pipe units 20 to ensure that the refrigerant can achieve a filtering effect through the filter screen components 30 when flowing in both forward and reverse directions.

[0035] In one embodiment, such as Figures 1-5 As shown, the filter element 30 includes a filter screen 31 and a filter screen holder 32. The filter screen 31 is mounted on the filter screen holder 32 and is then mounted on the connecting pipe unit 20 via the filter screen holder 32. This reduces the installation difficulty of the filter screen 31 and improves the reliability of its installation. To further enhance the reliability of the filter screen holder 32's installation, it can be interference-fitted into the connecting pipe unit 20.

[0036] Specifically, the filter holder 32 is provided with a slot, the filter 31 is formed into a net bag shape, and one open end of the filter 31 is clamped in the slot, thereby realizing the fixed connection between the filter 31 and the filter holder 32.

[0037] In one embodiment, the area of ​​the filter screen 31 is S, the mesh count of the filter screen 31 is n, the wire diameter of the filter screen 31 is d, the effective area of ​​the filter screen 31 is S1, and the flow area of ​​the valve port 102 is S2, wherein S1≥S2, and S1=(25.4 / nd). 2 ×S / (25.4 2 / n 2It should be noted that filter screen 31 has a mesh structure. The mesh count of filter screen 31 refers to the number of mesh openings per inch (25.4 mm). These openings are typically square, so 25.4 / nd can be considered the aperture of the filter screen 31. S / (25.4) 2 / n 2 This can be considered as the number of mesh openings in filter screen 31. Furthermore, since filter screen 31 is partially sandwiched within filter screen holder 32, the area of ​​filter screen 31 here refers to the area of ​​filter screen 31 excluding the portion connected to filter screen holder 32, that is, the area of ​​the portion of filter screen 31 that can perform filtering function, and the effective area of ​​filter screen 31 refers to the total flow area of ​​the mesh openings on filter screen 31 that perform filtering function.

[0038] It is easy to understand that by setting S1≥S2, that is, the total flow area of ​​the filter screen 31 will be greater than the flow area of ​​the valve port 102, so the throttling of the refrigerant when it flows through the filter screen 31 can be avoided, thereby ensuring the flow performance of the refrigerant.

[0039] In one embodiment, the connecting unit 20 includes a first connecting section 21 and a second connecting section 22. The two ends of the first connecting section 21 are respectively connected to the valve body 10 and the second connecting section 22. The second connecting section 22 is used to connect to the system pipeline. The first connecting section 21 and the second connecting section 22 are separately arranged, and the filter screen component 30 is installed on the second connecting section 22. In this way, the connecting unit 20 is simple to manufacture and the filter screen component 30 is easy to assemble.

[0040] Specifically, when the first connecting section 21 and the second connecting section 22 are installed separately, they can be made of different materials. For example, the first connecting section 21 can be made of stainless steel to reduce costs, while the second connecting section 22 can be made of copper to facilitate connection with external system piping. Of course, the first connecting section 21 and the second connecting section 22 can also be made of the same material, such as both copper or stainless steel. Here, the first connecting section 21 can be a regular connecting pipe or a capillary tube, depending on the specific needs.

[0041] Furthermore, such as Figure 1 As shown, the maximum outer diameter of the second connecting pipe section 22 is D1, and the outer diameter of the valve body 10 is D2, where D2 > D1. This allows a positioning reference surface to be formed at the end of the valve body 10 facing the connecting pipe unit 20, facilitating the assembly of other components within the expansion valve 100.

[0042] Furthermore, such as Figure 1As shown, the inner diameter of the first connecting pipe section 21 is D3, and the inner diameter of the connection between the second connecting pipe section 22 and the filter element 30 is D4, where D4 ≥ 2D3. This improves the filtration area and effect of the filter element 30 while avoiding adverse effects on refrigerant flow, thus ensuring refrigerant flow performance and preventing throttling. It should be noted that the inner diameter of the connection between the second connecting pipe section 22 and the filter element 30 refers to the inner diameter of the portion of the filter element 30 that actually mates with the second connecting pipe section 22, that is, the inner diameter of the connection between the second connecting pipe section 22 and the filter holder 32.

[0043] Of course, in other embodiments, the first connecting section 21 and the second connecting section 22 can also be an integral structure, as long as the filter element 30 can be installed and the same filtration effect can be achieved. For ease of explanation, this application uses a separate structure for the first connecting section 21 and the second connecting section 22 as an example.

[0044] Based on this, in one embodiment, such as Figure 1 As shown, the first connecting pipe section 21 can be directly connected to the valve body 10 and the second connecting pipe section 22. For example, both ends of the first connecting pipe section 21 can be inserted into the valve body 10 and the second connecting pipe section 22 respectively, and an interference fit is achieved. Simultaneously, the connection between the first connecting pipe section 21 and the valve body 10 and the second connecting pipe section 22 is achieved using an integrated furnace welding method. To facilitate solder penetration, decorative inserts can be provided on the outer circumference of both ends of the first connecting pipe section 21.

[0045] In another embodiment, such as Figure 2 As shown, the connecting unit 20 also includes a connecting sleeve 23, which is disposed between the first connecting section 21 and the second connecting section 22. The outer wall of the connecting sleeve 23 is connected to the second connecting section 22, and the inner wall of the connecting sleeve 23 is connected to the first connecting section 21. This reduces the difficulty of fitting the first connecting section 21 and the second connecting section 22 together.

[0046] Specifically, when the first connecting pipe section 21 is set as a connector with a small aperture such as a capillary tube, the second connecting pipe section 22 usually needs to be narrowed multiple times to match the aperture of the first connecting pipe section 21 in order to connect with the first connecting pipe section 21, which increases the processing difficulty. However, by setting the connecting sleeve 23, the first connecting pipe section 21 and the second connecting pipe section 22 can be directly matched by the connecting sleeve 23 without having to perform multiple flaring or narrowing processes, resulting in higher overall processing and connection efficiency.

[0047] Similarly, the connecting sleeve 23 can also be interference-fitted with the first pipe section 21 and the second pipe section 22 respectively, thereby further improving the connection strength. At the same time, the first pipe section 21 can be connected to the valve body 10, the connecting sleeve 23 and the second pipe section 22 by integral furnace welding, so as to improve the welding efficiency.

[0048] It should be noted that, since the first connecting pipe section 21 and the second connecting pipe section 22 are set separately and welded together in this embodiment, in order to avoid the high temperature during welding causing the filter screen holder 32 to deform and thus causing the filter screen 31 to change position, the filter screen holder 32 can be made of stainless steel to ensure the structural stability of the filter screen holder 32.

[0049] Furthermore, such as Figure 1 and Figure 2 As shown, the connecting pipe unit 20 is provided with a first limiting part 24, which is located at the end of the filter screen seat 32 near the valve body 10 and can abut against the filter screen seat 32 along the axial direction of the connecting pipe unit 20. In this way, the filter screen 31 can be limited, preventing the filter screen 31 from moving towards the valve body 10 under the action of the refrigerant.

[0050] Optionally, in one embodiment, the sidewall of the second pipe section 22 protrudes in a direction close to its own axis to form a first limiting part 24. Here, the first limiting part 24 can be configured as a convex ring or a plurality of protrusions spaced apart circumferentially along the second pipe section 22.

[0051] Optionally, in one embodiment, along the axial direction of the connecting pipe unit 20, the sidewall of the second connecting pipe section 22 gradually contracts toward the valve body 10 to form a first limiting part 24. That is, the first limiting part 24 can be formed by a step caused by the change in inner diameter at the constriction.

[0052] In addition, when a connecting sleeve 23 is provided, a first limiting part 24 can also be formed on the end face of the connecting sleeve 23 away from the valve body 10, without the need for additional processing, making the setup simpler.

[0053] To limit the movement of the filter screen 31 away from the valve body 10, in one embodiment, such as Figure 2 As shown, the connecting pipe unit 20 is also provided with a second limiting part 25. The second limiting part 25 is located at the end of the filter screen seat 32 away from the valve body 10, and can abut against the filter screen seat 32 along the axial direction of the connecting pipe unit 20. In this way, the stability of the filter screen 31 installed in the second connecting pipe section 22 is further improved. Here, the second limiting part 25 can also be set as a protrusion, a protruding ring, or a constriction, etc.

[0054] Furthermore, the end of the connecting pipe unit 20 away from the valve body 10 is provided with a mounting part 26. The mounting part 26 can be formed by flaring or shrinking the end of the connecting pipe unit 20 to match the external pipeline size and improve installation efficiency.

[0055] In one embodiment, such as Figures 3-7 As shown, the expansion valve 100 also includes a silencing plate 40, which is configured as a porous component and is located inside the pipe unit 20 to reduce the noise of refrigerant flow inside the pipe unit 20.

[0056] Specifically, the sound-absorbing plate 40 can be configured as a filter sintered block, which is woven from metal wires or alloy wires. These wires are then sintered together at high temperature to form a uniform block-shaped filter material with high strength and stability, effectively achieving a filtering effect. Furthermore, the sintered block has a dense internal pore structure with multiple layers (three or more), resulting in even better sound absorption.

[0057] Among them, such as Figure 3 As shown, the silencer plate 40 can be connected to the inner wall of the pipe unit 20; or, as... Figure 4 As shown, the sound-absorbing plate 40 can be connected to the inner wall of the filter holder 32; or, as... Figure 5 As shown, the silencing plate 40 is clamped between the filter screen seat 32 and the first limiting part 24 along the axial direction of the pipe unit 20, and can be reasonably set according to actual needs.

[0058] Furthermore, in one embodiment, a flow channel 401 is provided on the muffler 40, and the flow channel 401 extends through both ends of the muffler 40 along its own axial direction. It is easy to understand that the flow channel 401 facilitates the flow of refrigerant, reduces the pressure drop generated when the refrigerant flows through the muffler 40, thereby improving the flow capacity of the expansion valve 100.

[0059] The flow channel 401 can be configured as a through hole, in which case, for example... Figure 6 As shown, the sidewall of the flow channel 401 is spaced apart from the sidewall of the sound-absorbing plate 40. Alternatively, the flow channel 401 can be configured as a notch, forming the flow channel 401 between the notch and the inner wall of the second pipe section 22. In this case, as shown... Figure 7 As shown, the sidewall of the flow channel 401 is at least partially connected to the sidewall of the sound-absorbing plate 40, and the specific connection can be reasonably set according to actual needs.

[0060] 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.

[0061] 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, It includes a valve body (10), a connecting pipe unit (20) and a filter screen component (30), one end of which is connected to the valve body (10) and communicates with the interior of the valve body (10); The filter element (30) is installed inside the pipe unit (20) and is used to filter the refrigerant flowing through the pipe unit (20).

2. The expansion valve according to claim 1, characterized in that, The filter element (30) includes a filter screen (31), the area of ​​the filter screen (31) is S, the mesh number of the filter screen (31) is n, the wire diameter of the filter screen (31) is d, and the effective area of ​​the filter screen (31) is S1. The valve body (10) has a valve port (102) that communicates with the connecting pipe unit (20). The flow area of ​​the valve port (102) is S2, where S1≥S2 and S1=(25.4 / nd). 2 ×S / (25.4 2 / n 2 ).

3. The expansion valve according to claim 1, characterized in that, The connecting unit (20) includes a first connecting section (21) and a second connecting section (22), with the two ends of the first connecting section (21) connected to the valve body (10) and the second connecting section (22) respectively. The first connecting pipe section (21) and the second connecting pipe section (22) are separately arranged, and the filter screen component (30) is installed on the second connecting pipe section (22).

4. The expansion valve according to claim 3, characterized in that, The maximum outer diameter of the second connecting pipe section (22) is D1, and the outer diameter of the valve body (10) is D2, wherein D2 > D1; And / or, the inner diameter of the first connecting pipe section (21) is D3, and the inner diameter of the connection between the second connecting pipe section (22) and the filter screen component (30) is D4, wherein D4≥2D3.

5. The expansion valve according to claim 3, characterized in that, The filter component (30) includes a filter screen (31) and a filter screen base (32). The filter screen (31) is installed on the filter screen base (32) and is installed on the connecting pipe unit (20) through the filter screen base (32). The connecting pipe unit (20) is provided with a first limiting part (24), which is located at one end of the filter screen seat (32) near the valve body (10) and can abut against the filter screen seat (32) along the axial direction of the connecting pipe unit (20).

6. The expansion valve according to claim 5, characterized in that, The sidewall of the second connecting pipe section (22) protrudes in a direction close to its own axis to form the first limiting part (24). Alternatively, along the axial direction of the connecting pipe unit (20), the sidewall of the second connecting pipe section (22) is gradually narrowed toward the valve body (10) to form the first limiting part (24).

7. The expansion valve according to claim 5, characterized in that, The connecting unit (20) further includes a connecting sleeve (23), which is located between the first connecting section (21) and the second connecting section (22). The outer wall of the connecting sleeve (23) is connected to the second connecting section (22), and the inner wall of the connecting sleeve (23) is connected to the first connecting section (21).

8. The expansion valve according to claim 7, characterized in that, The first limiting part (24) is formed on the end face of the connecting sleeve (23) away from the valve body (10).

9. The expansion valve according to claim 5, characterized in that, The expansion valve also includes a silencing plate (40), which is configured as a porous component and is located within the connecting pipe unit (20). The silencing plate (40) is connected to the inner wall of the connecting pipe unit (20), or the silencing plate (40) is connected to the inner wall of the filter screen seat (32), or the silencing plate (40) is sandwiched between the filter screen seat (32) and the first limiting part (24) along the axial direction of the connecting pipe unit (20).

10. The expansion valve according to claim 9, characterized in that, The sound-absorbing plate (40) has an overflow channel (401) which passes through both ends of the sound-absorbing plate (40) along its own axial direction; The sidewall of the flow channel (401) is spaced apart from the sidewall of the sound-absorbing plate (40), or the sidewall of the flow channel (401) is at least partially connected to the sidewall of the sound-absorbing plate (40).

11. The expansion valve according to claim 5, characterized in that, The first connecting pipe section (21) and the second connecting pipe section (22) are welded and fixed together; The filter holder (32) is made of stainless steel.

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