Throttling stop valve and refrigerating system

Abstract

The utility model relates to a throttling stop valve and a refrigerating system.The throttling stop valve comprises a flange, the flange is connected with a mounting plate in the refrigerating system, the throttling stop valve further comprises an elastic buffer part, the buffer part comprises a first part matched with the flange, and the first part is arranged in the axial direction of the throttling stop valve; the first part is arranged on the side, close to a mounting plate in the refrigerating system, of the flange. When the throttling stop valve is applied to the refrigerating system, as the elastic buffer piece is arranged between the flange of the throttling stop valve and the mounting plate of the refrigerating system, when fluid flows through the throttling stop valve to cause vibration of the throttling stop valve, the buffer piece can absorb the energy of the vibration; therefore, the noise caused by frequently knocking the mounting plate by the flange of the throttling stop valve is reduced.

Description

Technical Field

[0001] This application relates to the technical field of valves, and in particular to a throttling shut-off valve and a refrigeration system. Background Technology

[0002] Throttling shut-off valves are widely used in the piping of air conditioning systems to control the flow of fluid within the piping by controlling the opening and closing of the valve orifice. Air conditioning systems typically include a mounting plate for installing the throttling shut-off valve. The valve body has a flange connection structure adapted to this mounting plate. By fixing the flange connection structure to the mounting plate, the throttling shut-off valve can be installed in the air conditioning system.

[0003] However, in existing throttling shut-off valves, the throttling shut-off valve also includes a throttling valve core and an on / off valve core disposed in the valve cavity inside the valve body. The throttling valve core has a throttling channel with a very small opening to achieve the throttling effect, and the on / off valve core cooperates with the on / off valve port to open or close the valve. The valve body is provided with a first pipe fitting communicating with the valve cavity and a second pipe fitting that can be selectively communicated with the valve cavity through the on / off valve port; when the on / off valve port is open, the first pipe fitting and the second pipe fitting are connected, and the fluid is throttled through the throttling valve core; when the valve port is closed, the first pipe fitting and the second pipe fitting are disconnected.

[0004] When fluid flows from the first fitting through the throttling channel, that is, from the valve cavity through the throttling channel, the opening area of ​​the throttling channel is smaller than the cross-sectional area of ​​the valve cavity. This sudden reduction in the fluid flow area increases the fluid velocity, and the fluid pressure cannot be released. Consequently, the fluid impacts the valve body, causing vibration, which results in the vibration of the throttling shut-off valve. Similarly, when fluid flows from the second fitting through the throttling channel, the opening area of ​​the throttling channel is smaller than the cross-sectional area of ​​the second fitting, and the velocity of the fluid entering the valve cavity also increases, causing vibration of the throttling shut-off valve body. Furthermore, due to the gap between the flange connection structure and the mounting plate of the existing throttling shut-off valve, resonance ultimately occurs between the throttling shut-off valve and the mounting plate, producing abnormal noise. Utility Model Content

[0005] Therefore, it is necessary to provide a throttling shut-off valve and refrigeration system that can reduce noise.

[0006] A throttling shut-off valve includes a flange connected to a mounting plate in a refrigeration system. The throttling shut-off valve also includes a resilient buffer element, the buffer element including a first portion adapted to the flange along the axial direction of the throttling shut-off valve, the first portion being disposed on the side of the flange near the mounting plate in the refrigeration system.

[0007] In one embodiment, the flange is connected to the mounting plate via a connector, and the first part has a clearance hole that extends through the first part along the height direction of the first part, and the connector passes through the clearance hole;

[0008] And / or, the throttling shut-off valve further includes a valve body with a partially arc-shaped outer periphery, the flange being disposed on the outer peripheral wall of the valve body, the end of the first portion being provided with an arc-shaped wall, the arc-shaped wall being adapted to the outer peripheral wall of the valve body, and the arc-shaped wall abutting against the valve body.

[0009] In one embodiment, the buffer further includes a second portion protruding from the first portion, the second portion being located on the side of the first portion away from the flange and extending in a direction away from the flange.

[0010] In one embodiment, the length of the flange is L, and the length of the second part is L1, where 0.25L≤L1≤0.5L.

[0011] In one embodiment, the buffer further includes a third portion that protrudes from the second portion on the side opposite to the first portion.

[0012] In one embodiment, the throttling valve further includes a valve body; the third part is at least two, and is arranged at intervals along the circumference of the valve body, or at intervals along the width direction of the flange.

[0013] In one embodiment, the height of the first part is H1, where 3mm ≤ H1 ≤ 6mm;

[0014] And / or, the height of the second part is H2, 3mm≤H2≤6mm;

[0015] And / or, the height of the third part is H3, where 3mm ≤ H3 ≤ 6mm.

[0016] In one embodiment, H1 = H2 = H3.

[0017] In one embodiment, the throttling shut-off valve further includes:

[0018] The valve body has a flange disposed on the outer peripheral wall of the valve body, a valve cavity is provided inside the valve body, and a valve port communicating with the valve cavity is opened on the inner peripheral wall of the valve body;

[0019] A throttling valve core is disposed at the end of the valve body. The throttling valve core has a first throttling channel, a second throttling channel, and a third throttling channel arranged sequentially and connected along the axial direction of the valve body. The first throttling channel is located at the end of the throttling valve core near the valve cavity and is connected to the valve cavity. The cross-sectional area of ​​the first throttling channel is smaller than the cross-sectional area of ​​the valve cavity, and the cross-sectional areas of the first throttling channel, the second throttling channel, and the third throttling channel gradually decrease along the axial direction of the valve body.

[0020] A shut-off valve core, at least partially disposed inside the valve body, is located at both ends of the valve cavity, along with the throttling valve core. The shut-off valve core is axially movable along the valve body. The shut-off valve core and the valve port are in a tightly abutting state and a separated state. When the shut-off valve core is separated from the valve port, the valve port is open. Axially, the shut-off valve core and the throttling valve core are located on opposite sides of the valve port. When the shut-off valve core is tightly abutting the valve port, the valve port is closed.

[0021] A first pipe fitting is disposed at the end of the valve body where the throttling valve core is located, and is disposed on the side of the throttling valve core away from the valve cavity. The first pipe fitting is connected to the valve cavity through the third throttling channel.

[0022] The second pipe fitting is located on the outer peripheral wall of the valve body and communicates with the valve cavity through the valve port.

[0023] This application also provides a refrigeration system, including a mounting plate and a throttling valve as described in any of the above embodiments. The throttling valve includes a flange and a buffer element, the flange being fixedly connected to the mounting plate and the buffer element being disposed between the flange and the mounting plate.

[0024] Compared with the prior art, when the throttling shut-off valve provided in this application is applied to a refrigeration system, because an elastic buffer is provided between the flange of the throttling shut-off valve and the mounting plate of the refrigeration system, when the fluid flows through the throttling shut-off valve and causes the throttling shut-off valve to vibrate, the buffer can absorb the energy of the vibration, thereby reducing the noise of the flange of the throttling shut-off valve frequently hitting the mounting plate. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a cross-sectional view of a throttling shut-off valve according to an embodiment of this application;

[0027] Figure 2 This is a top view of a buffer component according to an embodiment of this application;

[0028] Figure 3 This is a side view of a buffer component according to an embodiment of this application;

[0029] Figure 4 This is a bottom view of a buffer component according to an embodiment of this application;

[0030] Figure 5 This is a cross-sectional view of a throttling shut-off valve according to an embodiment of this application from another angle;

[0031] Figure 6 This is a perspective view of a throttling shut-off valve according to an embodiment of this application.

[0032] Attached label: 1. Throttling shut-off valve;

[0033] 10. Flange; 20. Buffer element; 21. First part; 22. Clearance hole; 23. Curved wall; 24. Second part; 25. Third part;

[0034] 30. Valve body; 31. Valve cavity; 32. Valve port; 50. Throttling valve core; 51. First throttling channel; 52. Second throttling channel; 53. Third throttling channel; 60. On / off valve core; 70. First fitting; 80. Second fitting;

[0035] 2. Mounting plate. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Please see Figures 1 to 6 This application provides a throttling shut-off valve 1, including a flange 10, which is connected to a mounting plate 2 in a refrigeration system. The throttling shut-off valve 1 also includes a resilient buffer 20, which includes a first part 21 adapted to the flange 10. Along the axial direction of the throttling shut-off valve 1, the first part 21 is located on the side of the flange 10 near the mounting plate 2 of the refrigeration system.

[0042] It is understandable that when the throttling valve 1 in this embodiment is applied to a refrigeration system, since an elastic buffer 20 is provided between the flange 10 of the throttling valve 1 and the mounting plate 2 of the refrigeration system, when the fluid flows through the throttling valve 1 and causes vibration of the throttling valve 1, the buffer 20 can absorb the energy of the vibration, thereby reducing the resonance effect between the flange 10 of the throttling valve 1 and the mounting plate 2, that is, reducing the noise of the flange 10 of the throttling valve 1 frequently striking the mounting plate 2. In addition, the external buffer 20 is not only easy to replace, but also allows for more intuitive observation of the wear condition of the buffer 20.

[0043] Indicatively, the material used to prepare the buffer 20 can be one or more of the following: natural rubber, synthetic rubber, thermoplastic elastomer, silicone rubber, polyvinyl chloride, etc. This application does not impose any restrictions on this, as long as the buffer 20 has a certain hardness and the hardness of the buffer 20 is less than the hardness of the flange 10 and the hardness of the mounting plate 2.

[0044] In one embodiment, flange 10 is connected to mounting plate 2 via a connector, see reference. Figure 2 and Figure 4 The first part 21 has a clearance hole 22 extending through the first part along its height. The connector passes through the clearance hole 22 to fix the buffer 20 between the flange 10 and the mounting plate 2. In other words, the connector passes through the clearance hole 22, so the first part 21 of the buffer 20 can also provide a buffering effect for vibrations between the flange 10 and the connector, and between the mounting plate 2 and the connector. Furthermore, the clearance hole 22 improves the fit between the first part 21 of the buffer 20 and the flange 10. In addition, the clearance hole 22 in the first part 21 also facilitates the installation and removal of the throttling valve 1 and the mounting plate 2.

[0045] Schematic illustration: the connector is a bolt, which provides a tighter and lower-cost fixation of the flange 10, buffer 20, and mounting plate 2. Furthermore, the connector can also be used with nuts to further increase the strength between the flange 10 and the mounting plate 2.

[0046] In one embodiment, see Figure 1 The throttling valve 1 also includes a valve body 30 with at least a partially arc-shaped outer periphery. A flange 10 is disposed on the outer peripheral wall of the valve body 30. The end of the first part 21 is provided with an arc-shaped wall 23 adapted to the outer peripheral wall of the valve body 30, and the arc-shaped wall 23 abuts against the outer peripheral wall of the valve body 30. That is, the end of the first part 21 with the arc-shaped wall 23 is located at the end of the flange 10 near the valve body 30. It can be understood that when fluid flows through the throttling valve 1 and causes the throttling valve 1 to vibrate, the end of the flange 10 connected to the valve body 30 experiences the greatest kinetic energy, and the kinetic energy gradually decreases along the length of the flange 10. The arc-shaped wall 23 allows the first part 21 to better adapt to the flange 10 and the valve body 30, thereby improving the absorption of the vibration energy of the throttling valve 1 by the buffer 20.

[0047] Furthermore, there are two flanges 10, symmetrically arranged around the valve body 30 along its diameter to improve the stability of the throttling valve 1 mounted on the mounting plate 2 of the refrigeration system. The number of buffer elements 20 is the same as the number of flanges 10, and they are arranged in a one-to-one correspondence to reduce the resonance effect between each flange 10 in the throttling valve 1 and the mounting plate 2. It is understood that the buffer elements 20 are also symmetrically arranged around the valve body 30 along its diameter to ensure that the first part 21 of the buffer element 20 is compatible with the flange 10.

[0048] In one embodiment, see Figure 3 The buffer 20 also includes a second portion 24 protruding from the first portion 21. The second portion 24 is located on the side of the first portion 21 away from the flange 10 and extends in a direction away from the flange 10. As described above, the end of the flange 10 connected to the valve body 30 experiences the greatest kinetic energy. The second portion 24 of the buffer 20 increases the thickness of the end of the buffer 20 near the flange 10, which can further decompose the vibration energy of the end of the flange 10 near the valve body 30, further reducing the impact force and frequency of the flange 10 on the mounting plate 2, thereby reducing noise generation.

[0049] Furthermore, the second part 24 is provided with an arc-shaped wall 23 near the end of the valve body 30. The arc-shaped wall 23 is also adapted to the pipe wall of the valve body 30, so as to improve the absorption efficiency of the buffer 20 on the vibration energy of the throttling valve 1.

[0050] Furthermore, the length of flange 10 is L, and the length of the second part 24 is L1, where 0.25L ≤ L1 ≤ 0.5L. It is understandable that since the kinetic energy experienced by the portion of flange 10 away from valve body 30 is relatively small, there is no need to further improve the energy absorption efficiency of buffer 20 in this portion. In other words, if the length L of the second part 24 is greater than 0.5L, it would result in a waste of material in manufacturing buffer 20; if the length L of the second part 24 is less than 0.25L, it may not be possible to increase the energy absorption efficiency of buffer 20. Therefore, setting the length L1 of the second part 24 between 0.25L and 0.5L is more appropriate. This not only saves costs but also utilizes the second part 24 to improve the efficiency of buffer 20 in absorbing the vibration energy of flange 10.

[0051] Indicatively, the length of the second part 24 is L1, which is 0.25L, 0.3L, 0.35L, 0.4L, 0.45, 0.5L, or any other value in the range of 0.25L≤L1≤0.5L.

[0052] In one embodiment, see Figure 3The buffer 20 also includes a third part 25, which protrudes from the second part 24 on the side opposite to the first part 21. The third part 25 of the buffer 20 can provide effective support for the buffer 20, further increasing the thickness of the buffer 20 near the valve body 30 and improving noise reduction performance.

[0053] In one embodiment, there are at least two third portions 25, which are spaced apart sequentially along the width direction of the flange 10. Thus, when the throttling valve 1 is installed on the mounting plate 2 of the refrigeration system, the third portions 25 can provide more effective support for the buffer 20, thereby ensuring that the height of the buffer 20 is uniform.

[0054] In one embodiment, there are at least two third portions 25, which are arranged sequentially at intervals along the circumference of the valve body 30. In this way, the third portions 25 can better fit the valve body 30 and improve the absorption of the vibration energy of the throttling shut-off valve 1 by the buffer 20.

[0055] In one embodiment, the height of the first part 21 is H1, where 3mm ≤ H1 ≤ 6mm. This effectively absorbs the vibration energy of the throttling valve 1 without excessively occupying the space between the flange 10 and the mounting plate 2, thus avoiding any impact on the connection between them. Illustratively, the height H1 of the first part 21 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, or any other value within the range of 3mm ≤ H1 ≤ 6mm.

[0056] In one embodiment, the height of the second part 24 is H2, where 3mm ≤ H2 ≤ 6mm. This effectively absorbs the vibration energy of the throttling valve 1 without excessively occupying the space between the flange 10 and the mounting plate 2, thus avoiding any impact on the connection between them. Illustratively, the height H2 of the second part 24 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, or any other value within the range of 3mm ≤ H2 ≤ 6mm.

[0057] In one embodiment, the height of the third part 25 is H3, where 3mm ≤ H3 ≤ 6mm. This effectively absorbs the vibration energy of the throttling valve 1 without excessively occupying the space between the flange 10 and the mounting plate 2, thus avoiding any impact on the connection between them. Illustratively, the height H3 of the third part 25 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, or any other value within the range of 3mm ≤ H3 ≤ 6mm.

[0058] Furthermore, the height relationship between the first part 21, the second part 24, and the third part 25 of the buffer 20 is: H1 = H2 = H3. This improves the ability of the buffer 20 to absorb the energy of vibration from the throttling valve 1.

[0059] It should be noted that the height of the first part 21 (H1), the second part 24 (H2), and the third part 25 (H3) mentioned above all refer to the height of the buffer 20 before the throttling valve 1 is installed on the mounting plate 2 of the refrigeration system. When the throttling valve 1 is installed on the mounting plate 2 of the refrigeration system, it will compress the buffer 20 to a certain extent to ensure the firmness between the flange 10 and the mounting plate 2, thereby ensuring that the buffer 20 can absorb the vibration energy of the throttling valve 1.

[0060] In one embodiment, see Figure 1 , Figure 5 and Figure 6 The throttling shut-off valve 1 also includes:

[0061] The valve body 30 has a flange 10 located on the outer peripheral wall of the valve body 30. The valve body 30 has a valve cavity 31 inside and a valve port 32 connected to the valve cavity is opened on the inner peripheral wall of the valve body 30.

[0062] A throttle valve core 50 is located at the end of the valve body 30. The throttle valve core 50 contains a first throttle channel 51, a second throttle channel 52, and a third throttle channel 53 arranged sequentially and connected along the axial direction of the valve body 30. The first throttle channel 51 is located at the end of the throttle valve core 50 near the valve cavity 31 and is connected to the valve cavity 31. The cross-sectional area of ​​the first throttle channel 51 is smaller than the cross-sectional area of ​​the valve cavity 31, and the cross-sectional areas of the first throttle channel 51, the second throttle channel 52, and the third throttle channel 53 gradually decrease along the axial direction of the valve body 30. The throttle valve core 50 is used to throttle the fluid between the valve cavity 31 and the first pipe.

[0063] The on / off valve core 60 is at least partially located inside the valve body 30, and the on / off valve core 60 and the throttling valve core 50 are respectively located at both ends of the valve cavity 31. The on / off valve core 60 can move along the axial direction of the valve body 30. The on / off valve core 60 and the valve port 32 have a tightly abutting state and a separated state. When the on / off valve core 60 and the valve port 32 are separated, the valve port 32 is exposed, that is, the valve port 32 is in the open state. At this time, along the axial direction of the valve body 30, the on / off valve core 60 and the throttling valve core 50 are respectively located on both sides of the valve port 32. When the on / off valve core 60 and the valve port 32 are tightly abutting, the valve port 32 is covered by the on / off valve core 60, and the valve port 32 is in the closed state.

[0064] The first pipe fitting 70 is located at the end of the valve body 30 where the throttling valve core 50 is located, and is located on the side of the throttling valve core 50 away from the valve cavity 31. The first pipe fitting 70 is connected to the valve cavity 31 through the third throttling channel 53.

[0065] The second pipe fitting 80 is located on the outer peripheral wall of the valve body 30 and communicates with the valve cavity 31 through the valve port 32. That is, the second pipe fitting 80 is located at the valve port 32 of the valve body 30. In the axial direction of the valve body 30, the first pipe fitting 70 and the second pipe fitting 80 are respectively located at both ends of the valve cavity 31.

[0066] It is understandable that regardless of whether the fluid flows into the valve chamber 31 from the first fitting 70 or the second fitting 80, it will cause the throttling shut-off valve 1 to vibrate. The buffer 20 in this embodiment can absorb the energy of this vibration, thereby reducing noise. Among them, one of the first fitting 70 and the second fitting 80 is the inlet pipe, and the other is the outlet pipe.

[0067] Specifically, the end of the on / off valve core 60 facing away from the throttle valve core 50 is defined as the first end, and the end closer to the throttle valve core 50 is defined as the second end. The side wall of the first end of the on / off valve core 60 is sealed to the inner wall of the valve cavity 31, and the second end is threaded to the inner wall of the valve cavity 31. The user rotates the on / off valve core 60 to move the on / off valve core along the axial direction of the valve body 30, thereby controlling the opening and closing of the valve port 32. It can also be understood that when the valve port 32 is in the open state, the second pipe 80 is connected to the first pipe 70 through the valve port 32 and the valve cavity 31; when the valve port 32 is in the closed state, since the valve port 32 is blocked by the on / off valve core 60, the second pipe 80 is disconnected from the valve cavity 31.

[0068] This application also provides a refrigeration system, including a mounting plate 2 and a throttling valve 1 as described in any of the above embodiments. The throttling valve 1 includes a flange 10 and a buffer 20. The flange 10 is fixedly connected to the mounting plate 2, and the buffer 20 is disposed between the flange 10 and the mounting plate 2. When fluid flows through the throttling valve 1 and causes the throttling valve 1 to vibrate, the buffer 20 can absorb the energy of the vibration, thereby reducing the noise from the flange 10 of the throttling valve 1 frequently striking the mounting plate 2, and thus reducing the noise during the operation of the refrigeration system.

[0069] 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.

[0070] 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. A throttling shut-off valve, comprising a flange (10) for connection to a mounting plate (2) in a refrigeration system, Its features are, The throttling shut-off valve also includes a resilient buffer (20), the buffer (20) including a first portion (21) adapted to the flange (10) along the axial direction of the throttling shut-off valve, the first portion (21) being disposed on the side of the flange (10) near the mounting plate (2) in the refrigeration system.

2. The throttling shut-off valve according to claim 1, characterized in that, The flange (10) is connected to the mounting plate (2) via a connector. The first part (21) has a clearance hole (22) that extends through the first part (21) along the height direction of the first part (21). The connector passes through the clearance hole (22). And / or, the throttling shut-off valve further includes a valve body (30) with at least a portion of its outer peripheral side being arc-shaped, the flange (10) being disposed on the outer peripheral wall of the valve body (30), the end of the first portion (21) being provided with an arc-shaped wall (23), the arc-shaped wall (23) being adapted to the outer peripheral wall of the valve body (30), and the arc-shaped wall (23) abutting against the valve body (30).

3. The throttling shut-off valve according to claim 1, characterized in that, The buffer (20) further includes a second part (24) protruding from the first part (21), the second part (24) being located on the side of the first part (21) away from the flange (10) and extending in a direction away from the flange (10).

4. The throttling shut-off valve according to claim 3, characterized in that, The length of the flange (10) is L, and the length of the second part (24) is L1, where 0.25L≤L1≤0.5L.

5. The throttling shut-off valve according to claim 3, characterized in that, The buffer (20) further includes a third part (25) which protrudes from the second part (24) on the side opposite to the first part (21).

6. The throttling shut-off valve according to claim 5, characterized in that, The throttling valve also includes a valve body (30); the third part (25) is at least two, and is arranged sequentially at intervals along the circumference of the valve body (30), or sequentially at intervals along the width direction of the flange (10).

7. The throttling shut-off valve according to claim 6, characterized in that, The height of the first part (21) is H1, 3mm≤H1≤6mm; And / or, the height of the second part (24) is H2, 3mm≤H2≤6mm; And / or, the height of the third part (25) is H3, 3mm≤H3≤6mm.

8. The throttling shut-off valve according to claim 7, characterized in that, H1 = H2 = H3.

9. The throttling shut-off valve according to any one of claims 1 to 8, characterized in that, The throttling shut-off valve also includes: The valve body (30) has a flange (10) on its outer peripheral wall, a valve cavity (31) inside the valve body (30), and a valve port (32) communicating with the valve cavity is opened on the inner peripheral wall of the valve body (30). A throttle valve core (50) is disposed at the end of the valve body (30). The throttle valve core (50) has a first throttle channel (51), a second throttle channel (52) and a third throttle channel (53) arranged sequentially and connected along the axial direction of the valve body (30). The first throttle channel (51) is located at the end of the throttle valve core (50) near the valve cavity (31). The first throttle channel (51) is connected to the valve cavity (31). The cross-sectional area of ​​the first throttle channel (51) is smaller than the cross-sectional area of ​​the valve cavity (31). The cross-sectional areas of the first throttle channel (51), the second throttle channel (52) and the third throttle channel (53) gradually decrease along the axial direction of the valve body (30). A shut-off valve core (60) is at least partially disposed inside the valve body (30). The shut-off valve core (60) and the throttling valve core (50) are respectively disposed at both ends of the valve cavity (31). The shut-off valve core (60) is capable of moving along the axial direction of the valve body (30). The shut-off valve core (60) and the valve port (32) have a tightly abutting state and a separated state. When the shut-off valve core (60) and the valve port (32) are separated, the valve port (32) is in an open state. In the axial direction of the valve body (30), the shut-off valve core (60) and the throttling valve core (50) are respectively located on both sides of the valve port (32). When the shut-off valve core (60) and the valve port (32) are tightly abutting, the valve port (32) is in a closed state. A first pipe fitting (70) is disposed at the end of the valve body (30) where the throttling valve core (50) is located, and is disposed on the side of the throttling valve core (50) away from the valve cavity (31). The first pipe fitting (70) is connected to the valve cavity (31) through the third throttling channel (53). The second pipe fitting (80) is disposed on the outer peripheral wall of the valve body (30) and communicates with the valve cavity (31) through the valve port (32).

10. A refrigeration system, characterized in that, Includes a mounting plate and a throttling valve as described in any one of claims 1 to 9. The throttling valve includes a flange and a buffer element. The flange is fixedly connected to the mounting plate, and the buffer element is disposed between the flange and the mounting plate.

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