Stop valve

Abstract

A stop valve (100). The stop valve (100) comprises a valve body (10) and a valve core assembly (2), wherein a first valve port (11) and a second valve port (12) are provided on the valve body (10); the valve core assembly (2) comprises a movable valve core (40) and a static valve core (50); the static valve core (50) is arranged in the valve body (10), and is located between the first valve port (11) and the second valve port (12); a first flow through-hole (22) is provided on the static valve core (50); the end of the movable valve core (40) that is close to the static valve core (50) abuts against the static valve core (50), and the movable valve core (40) can rotate relative to the static valve core (50); and when the movable valve core (40) rotates into a projection area of the first flow through-hole (22) in the axial direction of the static valve core (50), the movable valve core (40) covers the first flow through-hole (22).

Description

stop valve

[0001] Related applications

[0002] This application claims priority to the following Chinese patent applications filed on April 26, 2024, with application number 202420898395.0, entitled "Stop Valve with Motor"; filed on September 24, 2024, with application number 202422334562.1, entitled "Quick-Opening Stop Valve"; filed on November 8, 2024, with application number 202422721799.5, entitled "Stop Valve"; and filed on November 11, 2024, with application number 202422744621.2, entitled "An Electric Stop Valve", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of valve technology, and in particular to a gate valve. Background Technology

[0004] Gate valves are widely used in air conditioning system piping to control the opening and closing of pipelines. A gate valve typically consists of a valve body and a valve core. The valve body has at least two openings. The valve core moves within the valve body and abuts against the valve port, thus achieving connection or disconnection between the two openings. To facilitate valve core movement, air conditioning systems use flammable refrigerant. When the refrigerant production line leaks, the air conditioning circuit needs to be quickly shut off to cut off the refrigerant flow. However, because the valve core and valve body of gate valves in related technologies are usually threaded, when it is necessary to close or open the flow channel, the valve core needs to be rotated to move relative to the valve body. A hard seal is achieved through axial movement of the valve core and its abutment against the valve port. Therefore, the valve core often needs to be rotated thousands of degrees to move to the designated position. This process is slow and inefficient. Furthermore, the large contact area of ​​the threaded fit results in high friction, and the large torque can deform the valve core material to achieve a hard seal. Additionally, the threaded structure is prone to stripping, leading to threaded failure. Summary of the Invention

[0005] Based on this, this application provides a shut-off valve to address the aforementioned technical problems.

[0006] A shut-off valve includes a valve body and a valve core assembly. The valve body has a valve cavity, and a first valve port and a second valve port communicating with the valve cavity are provided on the valve body. The valve core assembly includes a moving valve core and a stationary valve core. The stationary valve core is disposed in the valve cavity and located between the first valve port and the second valve port. The stationary valve core has a first flow hole that communicates with the first valve port and the second valve port. The moving valve core abuts against the stationary valve core at one end near the stationary valve core and is rotatable relative to the stationary valve core. When the moving valve core rotates to the projection area of ​​the first flow hole in the axial direction of the stationary valve core, the moving valve core covers the first flow hole, and the first valve port and the second valve port are in an open state.

[0007] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description

[0008] To better describe and illustrate embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the currently described embodiments and / or examples, or the best mode of these inventions as currently understood.

[0009] Figure 1 is an exploded view of one embodiment of the shut-off valve provided in this application.

[0010] Figure 2 is a perspective view of one embodiment of the shut-off valve provided in this application.

[0011] Figure 3 is a cross-sectional view of one embodiment of the shut-off valve provided in this application.

[0012] Figure 4 is a schematic diagram of the valve core assembly of one embodiment of the shut-off valve provided in this application.

[0013] Figure 5 is a schematic diagram of the valve core rod of one embodiment of the gate valve provided in this application.

[0014] Figure 6 is a structural schematic diagram of the valve core rod from another angle of one embodiment of the gate valve provided in this application.

[0015] Figure 7 is a schematic diagram of the valve core shell of one embodiment of the gate valve provided in this application.

[0016] Figure 8 is a schematic diagram of the moving valve core and the stationary valve core of one embodiment of the gate valve provided in this application.

[0017] Figure 9 is a cross-sectional view of one embodiment of the shut-off valve provided in this application without a first sealing ring.

[0018] Figure 10 is a schematic diagram of the static valve core of one embodiment of the gate valve provided in this application.

[0019] Figure 11 is a schematic diagram of the gate valve structure provided in this application.

[0020] Figure 12 is a three-dimensional schematic diagram of the structure of the shut-off valve provided in this application.

[0021] Figure 13 is a perspective sectional view of the shut-off valve provided in this application.

[0022] Figure 14 is a schematic diagram of the internal structure of the valve body in the shut-off valve provided in this application.

[0023] Figure 15 is a cross-sectional view of one embodiment of the shut-off valve provided in this application.

[0024] Figure 16 is a partial enlarged view of the first embodiment at point A in Figure 15.

[0025] Figure 17 is a partial enlarged view of the second embodiment at point A in Figure 15.

[0026] Figure 18 is a partial enlarged view of the third embodiment at point A in Figure 15.

[0027] Figure 19 is a magnified view of part B in Figure 15.

[0028] Figure 20 is a cross-sectional view of another embodiment of the shut-off valve provided in this application.

[0029] Figure 21 is a partial enlarged view of one embodiment at point C in Figure 20.

[0030] Figure 22 is a partially enlarged view of another embodiment at point C in Figure 20.

[0031] Figure 23 is a schematic diagram of the structure of the shut-off valve in one embodiment of this application.

[0032] Figure 24 is a schematic diagram of the shut-off valve in Figure 23 of this application.

[0033] Figure 25 is an enlarged schematic diagram of part D in Figure 24.

[0034] Figure 26 is an enlarged schematic diagram of part E in Figure 24.

[0035] Figure 27 is a schematic diagram of the structure of the shut-off valve in one embodiment of this application.

[0036] Figure 28 is a schematic diagram of the valve core rod in one embodiment of this application.

[0037] Figure 29 is a schematic diagram of the structure of the shut-off valve in one embodiment of this application.

[0038] Figure 30 is a schematic diagram of the structure of a stop valve in one embodiment of this application.

[0039] Figure 31 is a schematic diagram of the shut-off valve in Figure 30.

[0040] Figure 32 is a longitudinal sectional view of the second sealing ring in one embodiment of this application.

[0041] Figure 33 is a longitudinal cross-sectional view of an irregularly shaped sealing ring in one embodiment of this application.

[0042] The symbols in the diagram represent the following meanings: 100, gate valve; 101, valve cavity; 102, first port; 103, second port; 104, assembly port; 105, retaining ring groove; 10, valve body; 11, first valve port; 12, second valve port; 13, second step; 131, third sealing groove; 14, connecting pipe section; 141, fluid passage; 142, limiting groove; 2, valve core assembly; 201, bottom; 20, valve core shell; 21, hollow cavity; 22, first flow hole; 23, second flow hole; 24. Positioning block; 64. Second sealing ring; 25. Protrusion; 26. Second anti-rotation part; 27. Second sealing groove; 30. Valve core rod; 301. Inner section; 3011. Top; 302. Sealing section; 303. Outer section; 3031. Drive mating part; 31. First sealing groove; 63. First sealing ring; 32. First step; 33. Mating protrusion; 40. Moving valve core; 41. Connecting section; 42. Sealing section; 43. Mating groove; 50. Stationary valve core; 51. First anti-rotation part; 61. 62. First sealing gasket; 65. Second sealing gasket; 66. Third sealing ring; 67. Sealing mating part; 68. Recessed area; 79. Wear-resistant part; 710. Bearing part; 81. Motor; 82. First connecting pipe; 83. Second connecting pipe; 84. Connector; 85. First filter structure; 86. First connecting part; 87.11. First clamping cavity; 88.12. First opening; 88.13. First fold; 88.14. Second fold; 89.11. First bending section; 80.12. Second filter structure; 861, second connecting part; 8651, second clamping cavity; 8612, second opening; 8613, third fold; 8614, fourth fold; 862, second filter screen; 8621, second bending section; 87, valve core shell limiting structure; 871, retaining ring; 88, oil replenishment structure; 882, second oil storage tank; 881, first oil storage tank; 883, lubricating oil storage cavity; 801, oil outlet; 802, oil injection hole; 803, sealing cap; 90, limiting member; 91, protrusion. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] This application provides a shut-off valve 100, which can drive the valve core rod 30 to rotate through an external drive source, and drive the moving valve core 40 to rotate through the connection between the valve core rod 30 and the moving valve core 40, so that the moving valve core 40 blocks the first flow hole 22 to achieve isolation between the first flow hole 22 and the second flow hole 23, thereby achieving more efficient and faster on / off control of the pipeline.

[0049] Please refer to Figures 1-3. The shut-off valve 100 includes a valve body 10 and a valve core assembly 2. The valve body 10 is constructed with an axially extending valve cavity 101. The valve body 10 is also provided with a first valve port 11 and a second valve port 12 that communicate with the valve cavity 101. The valve core assembly 2 is installed in the valve cavity 101. The valve core assembly 2 includes a moving valve core 40 and a stationary valve core 50. The stationary valve core 50 is disposed in the valve body 10 and is located between the first valve port 11 and the second valve port 12. A first flow hole 22 is provided on the stationary valve core 50. The end of the moving valve core 40 near the stationary valve core 50 abuts against the stationary valve core 50 and can rotate relative to the stationary valve core 50. When the moving valve core 40 rotates into the projection area of ​​the first flow hole 22 in the axial direction of the stationary valve core 50, the moving valve core 40 covers the first flow hole 22.

[0050] Thus, the first valve port 11 and the second valve port 12 on the valve body 10 are used for fluid inflow and outflow. When the moving valve core 40 blocks the first flow hole 22, the first flow hole 22 and the second flow hole 23 are isolated, and the shut-off valve 100 is in the closed state. When the moving valve core 40 releases the blockage of the first flow hole 22 with the rotation of the valve core rod 30, the shut-off valve 100 is in the open state. Therefore, the opening and closing of the shut-off valve 100 depends on whether the moving valve core 40 covers and blocks the first flow hole 22. The operation method of blocking the first flow hole 22 by rotating the moving valve core 40 is faster and more efficient than the operation method of the valve core and valve body 10 through threaded engagement and axial movement, effectively improving the opening and closing efficiency of the shut-off valve 100. It also has a low torque requirement for the external drive source, a small operating load, and avoids the risk of stripping of the threaded engagement structure. In addition, since the valve core assembly 2 does not need to move axially up and down to open and close the valve, the overall height of the shut-off valve 100 is reduced, saving installation space.

[0051] For example, in this embodiment, the external driving source is a motor 81, that is, the shut-off valve 100 also includes a motor 81. The motor 81 is connected to the moving valve core 40 and drives the moving valve core 40 to rotate so as to cooperate with the first flow hole 22.

[0052] The valve core assembly 2 also includes a valve core shell 20 and a valve core rod 30. The valve core shell 20 is connected to the valve body 10, and a hollow cavity 21 is constructed inside the valve core shell 20. A second flow hole 23 is provided on the cavity wall of the hollow cavity 21 formed by the valve core shell 20. The hollow cavity 21 is connected to the first valve port 11 through the first flow hole 22, and the hollow cavity 21 is connected to the second valve port 12 through the second flow hole 23. The valve core rod 30 is located inside the hollow cavity 21. One end of the valve core rod 30 is connected to the motor 81, and the other end is connected to the moving valve core 40. The valve core shell 20 and the valve core rod 30 are coaxially arranged. The valve core rod 30 can rotate around its own axis to drive the moving valve core 40 to rotate. As the valve core rod 30 rotates, the moving valve core 40 can block or open the first flow hole 22.

[0053] Thus, the first valve port 11 and the second valve port 12 on the valve body 10 are used for fluid inflow and outflow. Since the first flow hole 22 is connected to the first valve port 11 and the second flow hole 23 is connected to the second valve port 12, when the shut-off valve 100 is in the open state, the fluid flows in from the first valve port 11, passes through the first flow hole 22 and the second flow hole 23, and flows out of the valve body 10 from the second valve port 12. Because the valve core shell 20 and the valve core rod 30 are coaxially arranged, the valve core rod 30 can rotate freely within the valve core shell 20 along the axis of the valve core shell 20, thereby driving the moving valve core 40 to rotate and causing the moving valve core 40 to block or open the first flow hole 22.

[0054] Please refer to Figures 4-6 and 8. The moving valve core 40 has a mating groove 43, and the valve core rod 30 has a mating protrusion 33 at one end near the moving valve core 40. The mating protrusion 33 is inserted into the mating groove 43. The mating protrusion 33 and the mating groove 43 are engaged and limited to each other, so that the valve core rod 30 can drive the moving valve core 40 to rotate.

[0055] Specifically, in this embodiment, the moving valve core 40 is provided with two mating grooves 43 at intervals along the circumferential direction, and the valve core rod 30 is provided with two mating protrusions 33 at one end near the moving valve core 40, so as to achieve a more stable snap-fit ​​rotation between the two.

[0056] Please refer to Figure 8. Furthermore, the valve core assembly 2 also includes a stationary valve core 50, which is fixedly connected to the valve core housing 20, and the stationary valve core 50 has a first flow hole 22. In this way, the stationary valve core 50 and the valve core housing 20 can be processed and assembled separately, which reduces the difficulty of the process.

[0057] For example, both the stationary valve core 50 and the moving valve core 40 are made of ceramic material. Ceramic material has high hardness and is not easily deformed. It has a smooth surface and low friction. The moving valve core 40 can be rotated relative to the stationary valve core 50 with a very small torque, thereby closing the first flow hole 22. The closing torque requirement is low, which reduces the load on the motor 81.

[0058] Of course, in other embodiments, the stationary valve core 50 and the moving valve core 40 can also be made of other materials, such as brass, which facilitates processing, reduces costs, and because brass has lower hardness, the sealing effect is better after the stationary valve core 50 and the moving valve core 40 are hard sealed.

[0059] Understandably, the valve core shell 20 and the stationary valve core 50 can also be an integral structure, that is, the valve core shell 20 is directly integrally formed on the side near the first valve port 11 and abuts against the moving valve core 40. In this way, the first flow hole 22 can be directly opened on the valve core shell 20 without the need to set up the stationary valve core 50, which reduces the cost.

[0060] In this embodiment, at least a portion of the outer periphery of the stationary valve core 50 is circular, and the outer periphery of the stationary valve core 50 circumferentially abuts against the inner wall of the valve core shell 20. At least a portion of the outer periphery of the moving valve core 40 is circular, and the stationary valve core 50 and the moving valve core 40 are coaxially arranged. Because the outer periphery of the stationary valve core 50 abuts against the inner wall of the valve core shell 20, the connection between the stationary valve core 50 and the valve core shell 20 is tighter, ensuring that fluid can only pass through the first flow hole 22. Furthermore, because the moving valve core 40 and the stationary valve core 50 are coaxially arranged, the adaptability of the moving valve core 40 and the stationary valve core 50 is better. Since at least a portion of the outer periphery of the moving valve core 40 is circular, it can rotate freely within the projected area defined by the outer periphery of the stationary valve core 50. The axial projections of the two are more compatible, reducing interference.

[0061] Please refer to Figures 7 and 8. The outer periphery of the stationary valve core 50 is provided with at least one first anti-rotation portion 51, and the inner wall of the valve core housing 20 is provided with at least one second anti-rotation portion 26. The first anti-rotation portion 51 and the second anti-rotation portion 26 engage in a stop-locking cooperation, that is, the first anti-rotation portion 51 and the second anti-rotation portion 26 abut against each other and limit each other, thereby ensuring that the stationary valve core 50 does not rotate circumferentially during the frictional opening and closing operation with the moving valve core 40. Specifically, one of the first anti-rotation portion 51 and the second anti-rotation portion 26 can be a protrusion and the other a concave portion, or both can be protrusions, as long as they can abut against each other to form a stop-locking cooperation.

[0062] In this embodiment, the first anti-rotation part 51 is a protrusion protruding from the stationary valve core 50, and the second anti-rotation part 26 is a groove formed on the inner wall of the valve core housing 20.

[0063] For example, in this embodiment, the inner wall of the valve core housing 20 is provided with two second anti-rotation portions 26, and the outer periphery of the stationary valve core 50 is symmetrically provided with two first anti-rotation portions 51. The first anti-rotation portions 51 cooperate with the second anti-rotation portions 26 to improve the limiting strength and further ensure that the stationary valve core 50 will not rotate circumferentially when the moving valve core 40 rotates. Of course, the number of first anti-rotation portions 51 and second anti-rotation portions can be set to one or more, and can be selected according to actual needs.

[0064] Furthermore, at least two first flow holes 22 are provided, and at least two first flow holes 22 are rotationally symmetrical about the center of the stationary valve core 50. Having two or more first flow holes 22 increases the flow area, allowing more fluid to flow into the valve body 10 through the first flow holes 22, thus increasing the flow efficiency of the device. Since the moving valve core 40 blocks the first flow holes 22 by rotating the valve core rod 30, setting the first flow holes 22 to be rotationally symmetrical about the center of the stationary valve core 50 facilitates the moving valve core 40's ability to block the first flow holes 22 through rotation.

[0065] Furthermore, referring to Figure 10, the first flow hole 22 is fan-shaped. Understandably, the fan-shaped first flow hole 22 is more suitable for a stationary valve core 50 with at least a circular outer peripheral wall, which can maximize the flow area of ​​the first flow hole 22 under the same size constraints.

[0066] The moving valve core 40 includes a connecting section 41 and multiple sealing sections 42. All sealing sections 42 are connected to the connecting section 41. To accommodate the fan-shaped first flow hole 22, the sealing sections 42 are also fan-shaped. As the moving valve core 40 rotates, each sealing section 42 can cover one of the first flow holes 22, thus achieving complete isolation of the first flow hole 22. The fan-shaped first flow hole 22 is more suitable for the circular stationary valve core 50, maximizing the flow area of ​​the first flow hole 22 within the same size constraints. The matching shape of the sealing section 42 with the shape of the first flow hole 22 ensures a tight seal, preventing fluid leakage.

[0067] In other embodiments, the first flow hole 22 may be made in a circular, triangular or rectangular shape, as long as it can be covered and blocked by the blocking section 42.

[0068] In this embodiment, there are two first flow holes 22, which are symmetrically arranged with respect to the center of the stationary valve core 50. That is, the two first flow holes 22 are spaced 180° apart along the circumferential direction of the stationary valve core 50. The inner wall of the hollow cavity 21 formed by the valve core shell 20 is provided with at least one positioning block 24, and the line connecting the center of the positioning block 24 and the stationary valve core 50 forms a 90° angle with the line connecting the two first flow holes 22. Because the positioning block 24 can impede the further rotation of the valve core rod 30 by abutting against it, the moving valve core 40 will also stop rotating synchronously when the valve core rod 30 is limited. Furthermore, since the line connecting the positioning block 24 and the stationary valve core 50 forms a 90° angle with the line connecting the two first flow holes 22, the centerline of the moving valve core 40 also forms a 90° angle with the line connecting the two first flow holes 22 when the valve core rod 30 is abutting against the positioning block 24. Therefore, in this state, the moving valve core 40 is in an open (i.e., not blocking) state of the first flow hole 22, meaning the blocking section 42 does not cover the first flow hole 22, allowing fluid to flow between the first flow hole 22 and the second flow hole 23. Conversely, when the centerline of the moving valve core 40 coincides with the line connecting the two first flow holes 22, the moving valve core 40 is in a state of blocking the first flow hole 22. Therefore, it can be seen that the valve core rod 30 and the moving valve core 40 only need to rotate 90° to switch the shut-off valve 100 between the open and closed states, which is highly efficient and quick to open and close.

[0069] The valve core assembly 2 also includes a first sealing gasket 61 and a second sealing gasket 62. The first sealing gasket 61 is located at the end of the valve core rod 30 away from the first valve port 11 and is pressed against the inner wall of the hollow cavity 21 by the valve core rod 30. The second sealing gasket 62 is located at the end of the valve core shell 20 near the first valve port 11 and is located between the valve core shell 20 and the valve body 10, and is pressed against the valve body 10 by the valve core shell 20. Thus, the first sealing gasket 61 improves the sealing performance between the valve core rod 30 and the valve core shell 20, and the second sealing gasket 62 improves the sealing performance between the valve core shell 20 and the valve body 10, thereby enhancing the overall sealing performance of the shut-off valve 100.

[0070] In this embodiment, the inner wall of the valve body 10, which has a first valve port 11, narrows inward to form a second step 13. The narrowed section forms the first valve port 11 within the valve body 10. The second sealing gasket 62 is pressed tightly onto the second step 13 by the valve core shell 20, facilitating the placement of the second sealing gasket 62 to achieve a sealing effect. A first step 32 protrudes outward from the outer periphery of the valve core rod 30. The first sealing gasket 61 is disposed on the first step 32 and is pressed tightly against the valve core rod 30 and the valve core shell 20.

[0071] At least one first sealing groove 31 is provided on the outer periphery of the valve core rod 30, and a first sealing ring 63 is embedded in the first sealing groove 31. The outer periphery of the first sealing ring 63 abuts against the inner wall of the hollow cavity 21 formed by the valve core shell 20. The first sealing ring 63 further improves the sealing performance between the valve core rod 30 and the valve core shell 20.

[0072] For example, in this embodiment, two first sealing grooves 31 are formed along the axial direction on the outer periphery of the valve core rod 30, and a first sealing ring 63 is embedded in each of the two first sealing grooves 31. In other embodiments, in order to further improve the sealing between the valve core rod 30 and the valve core, more first sealing grooves 31 and first sealing rings 63 can be added, and the number is not limited to two.

[0073] The valve core housing 20 is connected to the valve body 10 by threads. Since the threaded connection lacks sufficient airtightness, the valve core assembly 2 also includes a second sealing ring 64. The second sealing ring 64 is located at the end of the valve core housing 20 furthest from the first valve port 11 and is pressed against the valve body 10 by the valve core housing 20, thereby ensuring a tight connection between the valve core assembly 2 and the valve body 10. It is understandable that the threaded connection makes subsequent disassembly and maintenance more convenient; the entire valve core assembly 2 can be removed from the valve body 10 simply by rotating it.

[0074] Furthermore, in order to facilitate the installation of the second sealing ring 64 and to achieve the sealing function of the second sealing ring 64, in some embodiments, a second sealing groove 27 is provided between the upper part of the valve core shell 20, which is relatively far away from the first valve port 11, and the valve body 10. The second sealing ring 64 is embedded in the second sealing groove 27 and abuts against the valve core shell 20 and the valve body 10 respectively.

[0075] It can be understood that the second sealing groove 27 can be formed by the radial inward concavity of the outer wall of the valve core shell 20 along the valve cavity 101, or by the radial inward concavity of the inner wall of the valve body 10 along the valve cavity 101, or by a portion of the outer wall of the valve core shell 20 and a portion of the inner wall of the valve body 10 enclosing the valve cavity 101 axially. The axially enclosing second sealing groove 27 can be formed by the L-shaped outer peripheral wall of the valve core shell 20 and the L-shaped inner peripheral wall of the valve body 10.

[0076] Referring to Figure 9, it can be understood that in some embodiments, the valve core shell 20 and the valve body 10 can also be connected by welding. Since the welded connection is tighter, the first sealing ring 63 is not required in this embodiment. This saves costs. It is understood that welding can improve the connection strength between the valve core shell 20 and the valve body 10. In this embodiment, laser welding is used.

[0077] Furthermore, the motor 81 is provided with a drive connection part, and the end of the valve core rod 30 facing away from the first valve port 11 is provided with a drive mating part 3031. Specifically, the drive connection part can be inserted and mated with the drive mating part 3031 to drive the valve core rod 30 to rotate along its own axis. One of the drive connection part and the drive mating part 3031 can be configured as a connecting protrusion, and the other can be configured as a connecting groove. Referring to Figure 4, in this embodiment, the drive mating part 3031 is a connecting groove, and the drive connection part corresponds to a connecting protrusion (not shown) that matches the shape of the connecting groove.

[0078] It is understood that in other embodiments, the drive mating part 3031 may also be configured as a connecting protrusion, and the drive connecting part may be configured as a connecting groove that matches the shape of the connecting protrusion.

[0079] It is understood that, in order to ensure that the drive connection part can drive the valve core rod 30 to rotate after being inserted into the drive mating part 3031, the inner or outer peripheral wall of the drive connection part or the drive mating part 3031 is non-circular. For example, referring to Figure 4, the inner peripheral wall of the drive mating part 3031 is polygonal.

[0080] Furthermore, one end of the valve stem needs to press firmly against the stationary valve core, while the other end needs to press firmly against the valve core shell at the top of the valve body. This ensures that the stationary and moving valve cores are always in contact, guaranteeing that fluid can only flow through the opening on the stationary valve core. However, because the valve stem is in direct contact with the valve core shell at the top of the valve body, there is significant friction between the valve stem and the valve core shell as the stem rotates and drives the moving valve core to rotate. Over time, this causes wear on the valve stem or valve core shell, leading to a decrease in pressure between the moving and stationary valve cores, a weakening of the contact effect, and ultimately, leakage.

[0081] Therefore, in some embodiments, referring to Figures 8, 10, 11, and 12, the shut-off valve provided in this application further includes an anti-wear component 71. The valve core housing 20 of the valve core assembly 2 is sleeved outside the valve core rod 30 and seals the valve cavity 101. The valve core rod 30 can rotate relative to the valve core housing 20. The anti-wear component 71 is disposed between the valve core rod 30 and the valve core housing 20, and the anti-wear component 71 is in a sealing fit with both the valve core rod 30 and the valve core housing 20.

[0082] Understandably, the valve core rod 30 is inserted inside the valve core housing 20 and can rotate relative to the valve core housing 20. The anti-wear component 71 is placed between the two, eliminating direct wear between the valve core rod 30 and the valve core housing 20, avoiding the reduction of pressure applied to the moving valve core 40 and the stationary valve core 50, ensuring that the two always maintain good contact, preventing leakage, and improving the service life of the shut-off valve.

[0083] For example, the valve core rod 30 includes a sealing section 302 and an inner section 301. The sealing section 302 passes through the valve core housing 20, and one end of the inner section 301 is connected to the sealing section 302, and the other end is connected to the moving valve core 40.

[0084] The direction from the side where the first valve port 11 is located towards the side where the motor 81 is located is defined as the height direction of the valve cavity 101. Along the height direction of the valve cavity 101, the sealing section 302 is located above the inner section 301. The inner section 301 has a top 3011, the valve core shell 20 has a bottom 201, and the anti-wear member 71 is disposed between the top 3011 and the bottom 201. The top 3011 faces away from the first valve port 11, and the bottom 201 faces the first valve port 11. It can be understood that during installation, the valve core shell 20 needs to be pressed against the valve core rod 30, and the valve core rod 30 applies pressure to the moving valve core 40 and the stationary valve core 50, so that the moving valve core 40 presses against the stationary valve core 50, and the stationary valve core 50 presses against the first valve port 11, thereby ensuring a good sealing effect. That is, the valve core shell 20 abuts against the inner section 301 of the valve core rod 30, thereby being able to press against the valve core rod 30. Since the moving valve core 40 and the stationary valve core 50 are clamped and rotated to open and close, there will be both axial rotation and axial load between the inner section 301 and the valve core shell 20.

[0085] This application places the anti-wear component 71 between the inner section 301 and the valve core shell 20 to bear the axial rotation and axial load between the two, eliminate direct wear between the two, avoid the reduction of pressure applied to the moving valve core 40 and the stationary valve core 50, and ensure that the two always maintain good contact, making leakage less likely and improving the service life of the gate valve.

[0086] For example, the anti-wear component 71 can be configured as a bearing component 711. The bearing component 711 can ensure smooth relative rotation between the valve core rod 30 and the valve core housing 20, and can also prevent wear between the two. Moreover, the presence of the bearing component 711 makes the rotation between the valve core rod 30 and the valve core housing 20 smoother and less strenuous, effectively reducing the torque of the valve core rod 30 and the valve core rotation.

[0087] Furthermore, along the height direction of the valve cavity 101, the top surface of the bearing member 711 is in a sealing fit with the bottom of the valve core shell 20, and the bottom surface of the bearing member 711 is in a sealing fit with the top 3011 of the inner section 301. In this embodiment, the sealing fit refers to the sealing structure formed by the abutment fit.

[0088] In this embodiment, bearing component 711 can be a thrust ball bearing. Ordinary deep groove ball bearings consist of an inner ring and an outer ring, and can only withstand loads in the diametrical direction. Thrust bearings consist of an upper ring and a lower ring, and compared to ordinary deep groove ball bearings, can better withstand axial loads.

[0089] Furthermore, the valve core rod 30 also includes an outer section 303, which is connected to the sealing section 302. In this embodiment, the outer section 303 extends at least partially beyond the valve body 10 to form a drive engagement portion 3031. That is, along the height direction of the valve body 10, the valve core rod 30 is divided into an upper outer section 303, a middle sealing section 302, and a lower inner section 301. One end of the outer section 303 is provided with a drive engagement portion 3031, which is used to cooperate with external tools for operation.

[0090] In this embodiment, the upper part of the outer section 303 extends to the outside of the valve body 10 and forms a drive engagement part 3031. The drive engagement part 3031 is connected to an external drive member (i.e., the motor 81) to drive the valve core rod 30 to rotate. Exemplarily, in this embodiment, the drive engagement part 3031 is configured as a connecting protrusion protruding from the valve cavity 101, and the drive connection part of the motor 81 is configured as a connecting groove matching the shape of the connecting protrusion. Specifically, the connecting protrusion can be a polygonal prism.

[0091] In one embodiment, the outer section 303, the sealing section 302, and the inner section 301 are integrated into a single structure. The valve core rod 30 has a more robust structure and is easier to manufacture.

[0092] In one embodiment, the shut-off valve 100 further includes a limiting member 90. This limiting member 90 is disposed within the valve cavity 101, sleeved outside the inner connecting section 301, and abuts against the inner wall of the valve cavity 101. By limiting the position of the valve core rod 30 through the limiting member 90, even if wear occurs at the wear-resistant part 71, the limiting member 90 can further limit the tightness of the valve core rod 30 against the stationary valve core 50, thereby extending its service life.

[0093] Furthermore, the outer side of the limiting member 90 is provided with at least one protrusion 91, and the inside of the valve cavity 101 is provided with a recess that mates with the protrusion 91. After the protrusion 91 is engaged with the recess, the limiting member 90 is prevented from rotating relative to the valve cavity 101.

[0094] Of course, this is not the only option. A protrusion 91 may also be provided inside the valve cavity 101, which abuts against the protrusion 91 on the limiting member 90 to restrict the rotation of the limiting member 90. Multiple protrusions 91 may be provided on the outer side of the limiting member 90, and multiple recesses or protrusions 91 may be provided inside the valve cavity 101. The specific choice can be made according to actual needs.

[0095] For example, the limiting member 90 can be an integral part of the valve body 10 or a separate structure from the valve body 10. In this embodiment, it is preferably made separately and has a sheet-like structure. The material of the limiting member 90 can be a wear-resistant material such as ceramic, and there is no limitation here.

[0096] In one embodiment, the shut-off valve further includes a third sealing ring 65. The third sealing ring 65 is disposed between the stationary valve core 50 and the first valve port 11, and the third sealing ring 65 is in sealing engagement with both the stationary valve core 50 and the first valve port 11.

[0097] Understandably, the stationary valve core 50 and the first valve port 11 abut against each other and require a good sealing fit to prevent leakage between them. By adding a third sealing ring 65, the sealing effect between the stationary valve core 50 and the first valve port 11 is enhanced, further preventing the possibility of leakage between them and improving the sealing performance and pressure resistance of the gate valve.

[0098] Furthermore, a second step 13 is formed on the cavity wall of valve cavity 101 near the first valve port 11, protruding into valve cavity 101. The first valve port 11 is formed at the second step 13, and a third sealing ring 65 is disposed between the stationary valve core 50 and the second step 13. The side of the third sealing ring 65 near the first valve port 11 is in sealing engagement with the second step 13. The addition of the second step 13 can further enhance the sealing effect between the stationary valve core 50 and the first valve port 11.

[0099] Furthermore, the second step 13 has a third sealing groove 131, and the third sealing ring 65 is at least partially embedded in the third sealing groove 131 to form a sealing fit with the static valve core 50 and the first valve port 11 respectively.

[0100] It is understandable that the embedding method can achieve all-round sealing and limiting. In other words, on the basis of sealing, it also limits the third sealing ring 65, effectively preventing the third sealing ring 65 from shifting under high pressure and further reducing the possibility of leakage.

[0101] For example, the third sealing ring 65 can be a rubber ring, an O-ring, etc. The specific choice can be made according to actual needs.

[0102] It is understood that in other embodiments, the second step 13 may also be provided with a protruding structure. The protruding structure can form a space with the inner wall of the valve body 10 to accommodate the third sealing ring 65.

[0103] Furthermore, in this embodiment, the first sealing ring 63 is disposed between the sealing section 302 and the valve core shell 20. The first sealing groove 31 is specifically formed on the outer side wall of the sealing section 302, and the two sides of the first sealing ring 63 respectively seal with the first sealing groove 31 and the valve core shell 20. It can be understood that the number of first sealing rings 63 corresponds to the number of first sealing grooves 31.

[0104] Similarly, in this embodiment, the number of first sealing grooves 31 can also be set to one or more. In this embodiment, the sealing section 302 is set to two seals, which ensures good sealing without causing excessive cost.

[0105] It is understandable that the first sealing ring 63 can be a rubber ring, O-ring, etc. The specific choice can be made according to actual needs.

[0106] Furthermore, a second sealing ring 64 is provided between the valve core housing 20 and the valve cavity 101. A second sealing groove 27 is provided on the valve core housing 20 near the upper part, and the second sealing ring 64 is placed in the second sealing groove 27. The two sides of the second sealing ring 64 respectively seal with the second sealing groove 27 and the inner wall of the valve cavity 101.

[0107] For example, the second sealing ring 64 can be a rubber ring, an O-ring, etc. The specific choice can be made according to actual needs.

[0108] Furthermore, in this embodiment, along the axial direction of the valve body 10, a protrusion 25 is provided on the top of the valve core shell 20, and the top surface of the protrusion 25 protrudes beyond the top surface of the valve body 10. When the external connection section 303 is connected to the motor 81, the motor 81 applies pressure to the valve core shell 20 through the protrusion 25, which in turn applies pressure to the valve core rod 30, and the valve core rod 30 applies pressure to the valve core, ensuring good crimping of the valve core and avoiding the possibility of leakage. For example, the number of protrusions 25 is set to two, and they are symmetrically arranged, resulting in more stable applied pressure.

[0109] Referring to Figures 8 and 12, the moving valve core 40 is provided with a mating groove 43, and the inner section 301 of the valve core rod 30 forms a mating protrusion 33. The mating protrusion 33 can be inserted into the mating groove 43 and engaged with the mating groove 43 for limiting, so that the rotation of the valve core rod 30 can drive the moving valve core 40 to rotate.

[0110] In this embodiment, the moving valve core 40 is provided with two mating grooves 43 at intervals along the circumferential direction, and the inner section 301 of the valve core rod 30 is provided with two mating protrusions 33, thereby achieving a more stable snap-fit ​​rotation between the two.

[0111] Referring to Figures 10 and 2, the outer periphery of the stationary valve core 50 is provided with a first anti-rotation part 51, and the inner wall of the valve cavity 101 is provided with a second anti-rotation part 26. That is, the first anti-rotation part 51 and the second anti-rotation part are in anti-rotation cooperation, thereby preventing the stationary valve core 50 from rotating relative to the valve cavity 101.

[0112] It should be noted that in this application, the shut-off valve 100 is further configured with a first port 102 and a second port 103 communicating with the valve cavity 101 for fluid inflow or outflow. The valve body 10 has an axially extending valve cavity 101 and a radially extending fluid channel 141. One end of the fluid channel 141 communicates with the valve cavity 101 through a second valve port 12, and the other end forms the second port 103. One end of the valve cavity 101 is powered by a motor 81 and connected to the valve core assembly 2 inside the valve cavity 101, and the other end forms the first port 102. A first valve port 11 is formed between the first port 102 and the second valve port 12. That is, the first port 102, the first valve port 11, the second valve port 12, and the second port 103 are arranged at intervals and connected sequentially, wherein the first valve port 11 and the second valve port 12 are connected and disconnected through the valve core assembly 2.

[0113] Furthermore, when foreign objects in the fluid adhere to the valve core, the resistance to the valve core's movement increases, preventing the shut-off valve from achieving its full open / close function and increasing the risk of fluid leakage. Simultaneously, if foreign objects adhere to related structures that mate with the valve core, such as the sealing structure at the valve core, it will also affect the sealing effect and lead to fluid leakage.

[0114] Therefore, referring to Figures 13 to 22, this application also provides an embodiment. The main difference between this embodiment and the above embodiment is that the shut-off valve 100 further includes a first connecting pipe 82 and a first filter structure 85. As shown in Figures 13, 14, 15, and 20, the first connecting pipe 82 is connected to the first port 102 of the valve body 10, facilitating the connection between the valve body 10 and an external pipeline. The external pipeline delivers fluid into the first connecting pipe 82, which then delivers it into the first port 102. Furthermore, the first filter structure 85 is located on the side of the stationary valve core 50 near the first port 102 to filter impurities in the fluid, preventing impurities from entering the valve cavity 101 from the first port 102. This prevents impurities from affecting the fit of the moving valve core 40, the stationary valve core 50, and other internal structures, thus preventing fluid leakage. For example, if impurities adhere to the moving valve core 40, and the motor torque remains unchanged, the resistance to rotation of the moving valve core 40 increases, making it impossible to completely block the first flow hole 22, resulting in sealing failure. Therefore, a first filter structure 85 is provided to avoid such a situation. Specifically, the first filter structure 85 is provided with a first connecting part 851, which is assembled in the valve body 10 and / or the first pipe 82. The first filter structure 85 is assembled through the first connecting part 851.

[0115] Furthermore, the shut-off valve 100 also includes a second filter structure 86, which has a second connection part 861 and is installed on the side of the stationary valve core 50 near the second port 103 through the second connection part 861 to remove impurities in the fluid and prevent impurities in the fluid entering the valve cavity 101 from the second port 103 from affecting the internal structure of the valve cavity 101, thereby preventing fluid leakage.

[0116] In summary, along the fluid flow direction, the moving valve core 40 and the stationary valve core 50 are located between the first filter structure 85 and the second filter structure 86. By setting the first filter structure 85 and the second filter structure 86, foreign objects can be prevented from entering the valve chamber 101, thereby protecting the normal operation of various components such as the stationary valve core 50 and the moving valve core 40 in the valve chamber 101 and preventing fluid leakage.

[0117] As shown in Figures 4 to 6, in a specific embodiment, the first filter structure 85 includes a first filter screen 852, which is connected to a first connecting portion 851 and performs a filtering function. Further, the first connecting portion 851 is bent to form a first clamping cavity 8511 and a first opening 8512 communicating with the first clamping cavity 8511. The bending process eliminates the need for drilling, making the first connecting portion 851 more structurally intact. The first filter structure also includes the first filter screen 852, the edge of which extends from the first opening 8512 into the first clamping cavity 8511, and the cavity wall of the first clamping cavity 8511 clamps the edge of the first filter screen 852. During assembly, the edge of the first filter screen 852 is first inserted into the first clamping cavity 8511. External force is used to bring the cavity walls of the first clamping cavity 8511 closer together to clamp the first filter screen 852, thus fixing the first filter screen 852. The distance between the cavity walls of the first clamping cavity 8511 can be flexibly adjusted according to the thickness of the first filter screen 852.

[0118] In a further embodiment, the first filter screen 852 is configured as a mesh surface that unfolds radially along the valve cavity 101, which has a simple structure and is easy to manufacture. In other embodiments, the first filter screen 852 protrudes along the axial direction of the valve cavity 101 toward the side away from the stationary valve core 50, in order to avoid interference with the stationary valve core 50 and to increase the filtration area of ​​the first filter screen 852, thereby enhancing the filtration effect. More specifically, the mesh surface of the first filter screen 852 can be configured as a smooth curved surface, which helps to reduce dead angles and promotes smooth fluid flow.

[0119] As shown in Figures 13, 15 and 20, in an optional embodiment, the first connecting pipe 82 passes through the first port 102 and is inserted into the valve cavity 101. The structure is simple, the assembly is convenient, the external space is reduced, and the assembly is compact.

[0120] As shown in Figure 16, in one embodiment, along the axial direction of the valve cavity 101, the first connecting portion 851 is located between the end faces of the second step 13 and the first connecting pipe 82. The first connecting portion 851 is welded to at least the second step 13 or the first connecting pipe 82. This arrangement ensures that the end faces of both the second step 13 and the first connecting pipe 82 provide a limiting effect on the first connecting portion 851, facilitating its positioning. The first connecting portion 851 can be welded to the second step 13, or to the first connecting pipe 82, or both the second step 13 and the first connecting pipe 82 can be welded to the first connecting portion 851 simultaneously.

[0121] During assembly, the first filter structure 85 is welded and fixed first, and then the stationary valve core 50 is installed from the assembly port 104. The welding slag of the first filter structure 85 can be cleaned before the stationary valve core 50 is installed to avoid the welding slag from having an adverse effect on the internal parts of the valve cavity 101, such as the stationary valve core 50.

[0122] At this time, the edge of the first filter screen 852 is provided with a first bent section 8521 to adapt to the connection of the first connecting part 851 between the end face of the second step 13 and the first pipe 82. The first opening 8512 is radially toward the cavity wall of the valve cavity 101. The first bent section 8521 extends from the first opening 8512 into the first clamping cavity 8511. The cavity wall of the first clamping cavity 8511 clamps the first bent section 8521. Along the thickness direction of the first bent section 8521, at least one side of the first connecting part 851 is used to connect the second step 13 or the first pipe 82.

[0123] As shown in Figure 17, in another embodiment, the third sealing ring 65 has a sealing engagement portion 651, which protrudes from the third sealing groove 131 and presses against the stationary valve core 50 and the second step 13; the sealing engagement portion 651 is connected to the first connecting portion 851. That is, after the first filter structure 85 and the third sealing ring 65 are connected to form a whole and then installed into the valve cavity 101, the assembly of the first filter structure 85 will not affect the internal structure of the valve cavity 101. The third sealing ring 65 serves to assemble the first filter structure 85 while achieving a sealing function. In this embodiment, the arrangement of the first connecting portion 851 is similar to the structure shown in the embodiment of Figure 16, and will not be described again here.

[0124] In a specific embodiment, the third sealing ring 65 and the first filter structure 85 are injection molded into an integral structure, which is simple to assemble. That is, the first connecting part 851 and the first bending section 8521 are respectively injection molded into the sealing mating part 651, without the need to drill holes in the third sealing ring 65, thus ensuring the sealing performance of the third sealing ring 65.

[0125] As shown in Figure 18, in another embodiment, the inner wall of the first connecting pipe 82 is press-fitted with the first connecting portion 851 so that the first filter structure 85 is tightly installed in the first connecting pipe 82, preventing it from shrinking and falling off the inner wall of the first connecting pipe 82 after encountering supercooled fluid, thus ensuring assembly reliability. At this time, the first connecting pipe 82 abuts against the second step 13, and the second step 13 limits the insertion length of the first connecting pipe 82 relative to the valve body 10, which is beneficial for the assembly positioning of the first connecting pipe 82.

[0126] In this embodiment, the structure of the first connecting part 851 and the first filter screen 852 is similar to that in the embodiment shown in FIG16, except that: the first opening 8512 is arranged axially away from the moving valve core 40 along the valve cavity 101; the first filter screen 852 does not need to be provided with a first bending section 8521 to be assembled with the first clamping cavity 8511; the first filter screen 852 extends directly into the first clamping cavity 8511 from the first opening 8512; and the outer peripheral wall of the first connecting part 851 is press-fitted with the inner wall of the first connecting pipe 82.

[0127] In a specific embodiment, the first connecting portion 851 is bent to form a first fold 8513 and a second fold 8514 connected to the first fold 8513. The first fold 8513 is press-fitted with the first connecting pipe 82. The length of the first fold 8513 is greater than that of the second fold 8514. The portion of the first fold 8513 located at the first opening 8512 that is longer than the second fold 8514 is pressed radially inward along the valve cavity 101 onto the first filter screen 852 to enhance the limiting assembly of the first filter screen 852.

[0128] As shown in Figures 13, 15, and 20, in an optional embodiment, a connecting pipe section 14 is formed on the side wall of the valve body 10 in a direction away from the valve cavity 101, so as to facilitate communication with an external pipeline through the connecting pipe section 14. The arrangement of the connecting pipe section 14 can extend the distance between the connection position with the external pipeline and the valve body 10, reducing the impact of the connection on the internal structure of the valve cavity 101. A fluid channel 141 communicating with the valve cavity 101 is constructed inside the connecting pipe section 14, through which fluid is transported into the valve cavity 101. A second port 103 is formed at the end of the connecting pipe section 14. A second filter structure 86 is installed on the connecting pipe section 14 through a second connecting part 861, and is at least partially located in the fluid channel 141.

[0129] In a specific embodiment, the second filter structure 86 includes a second filter screen 862, which is connected to the second connecting portion 861 and performs a filtering function. Further, the second connecting portion 861 is bent to form a second clamping cavity 8651 and a second opening 8612 communicating with the second clamping cavity 8651. The bending process eliminates the need for drilling, making the second connecting portion 861 more structurally intact. The second filter structure 86 also includes the second filter screen 862, the edge of which extends from the second opening 8612 into the first clamping cavity 8511, where the cavity wall of the first clamping cavity 8511 clamps the edge of the second filter screen 862. During assembly, the edge of the second filter screen 862 is first inserted into the second clamping cavity 8651. External force is used to bring the cavity walls of the second clamping cavity 8651 closer together to clamp the second filter screen 862, thus fixing the second filter screen 862. The distance between the cavity walls of the first clamping cavity 8511 can be flexibly adjusted according to the thickness of the second filter screen 862.

[0130] In a further embodiment, the second filter screen 862 is configured as a mesh surface that unfolds radially along the fluid channel 141, which has a simple structure and is easy to manufacture. In two other embodiments, the second filter screen 862 protrudes axially along the fluid channel 141, which increases the filtration area of ​​the second filter screen 862 and enhances the filtration effect. More specifically, the mesh surface of the second filter screen 862 can be configured as a smooth curved surface, which helps to reduce dead angles and promotes smooth fluid flow.

[0131] As shown in Figure 19, in a further embodiment, the second filter structure 86 is completely located within the fluid channel 141. That is, the second filter structure 86 does not protrude outwards from the second opening 103, which helps protect the second filter structure 86 and also avoids interference between the connecting pipe section 14 and the external connection. In this case, the second connecting portion 861 is press-fitted with the inner wall of the connecting pipe section 14 to ensure a secure assembly of the second filter structure 86. This helps the second filter structure 86 resist fluid impact and prevents it from contracting and detaching from the fluid channel 141 when encountering supercooled fluid.

[0132] It should be noted that when the second filter structure 86 is completely located within the fluid channel 141, the length of the second filter structure 86 along the axial direction of the fluid channel 141 is less than the length of the fluid channel 141, so as to avoid the second filter structure 86 being too long and affecting the normal operation of the internal parts of the valve chamber 101.

[0133] In a more specific embodiment, along the axial direction of the fluid channel 141, the second connecting part 861 is located between the second filter screen 862 and the second port 103, that is, the second connecting part 861 is closer to the second port 103. During assembly, the assembly status of the second connecting part 861 and the connecting pipe section 14 can be directly observed from the second port 103, making the operation simpler.

[0134] As shown in Figures 15 and 19, in some embodiments, the end of the connecting pipe section 14 is connected to a connector 84 for connection to an external pipe fitting. As shown in Figures 20 to 22, in other embodiments, the end of the connecting pipe section 14 may also be connected to a second connecting pipe 83.

[0135] As shown in Figures 20 to 22, in an optional embodiment, the end of the connecting pipe section 14 is connected to a second connecting pipe 83, which passes through the second port 103 and is inserted into the fluid channel 141; the second connecting part 861 is at least connected to the second connecting pipe 83, and the second filter structure 86 can be assembled into the fluid channel 141 according to the position of the second connecting pipe 83 or be assembled into the fluid channel 141 following the second connecting pipe 83.

[0136] As shown in Figure 21, in a specific embodiment, the connecting pipe section 14 is recessed inward along the axial direction of the fluid channel 141 at the end face where the second port 103 is located to form a limiting groove 142; the second connecting portion 861 is located between the bottom of the limiting groove 142 and the end face of the second connecting pipe 83 facing the fluid channel 141, and the second connecting portion 861 is welded to either the limiting groove 142 or the second connecting pipe 83. Thus, the bottom of the limiting groove 142 and the end face of the second connecting pipe 83 both limit the second connecting portion 861, facilitating its positioning. The second connecting portion 861 can be welded to the bottom of the limiting groove 142, or welded to the second connecting pipe 83, or the second connecting portion 861 can be welded to the bottom of the limiting groove 142 on one side along the axial direction of the fluid channel 141, and to the second connecting pipe 83 on the other side.

[0137] At this time, the edge of the second filter screen 862 is provided with a second bent section 8621 to adapt to the connection between the second connecting part 861 located at the bottom of the limiting groove 142 and the end face of the second connecting pipe 83. The second opening 8612 is radially toward the inner wall of the connecting pipe section 14. The second bent section 8621 extends from the second opening 8612 into the second clamping cavity 8651. The cavity wall of the second clamping cavity 8651 clamps the second bent section 8621. Along the thickness direction of the second bent section 8621, at least one side of the second connecting part 861 is used to connect the bottom of the limiting groove 142 or the second connecting pipe 83.

[0138] As shown in Figure 22, in other embodiments, at least the second connecting pipe 83 may abut against the bottom of the limiting groove 142, and the bottom of the limiting groove 142 may at least have a positioning function for the assembly of the second connecting pipe 83. In this case, the inner wall of the second connecting pipe 83 is interference-fitted with the second connecting portion 861 to ensure that the second filter structure 86 is firmly assembled, which is beneficial for resisting fluid impact and preventing the second filter structure 86 from contracting when encountering supercooled fluid and falling off from the second connecting pipe 83.

[0139] At this time, the second opening 8612 is axially away from the valve chamber 101 along the fluid channel 141. The second filter screen 862 does not need to be assembled with the second bending section 8621 and the second clamping cavity 8651. The second filter screen 862 extends directly into the second clamping cavity 8651 from the second opening 8612. The outer peripheral wall of the second connecting part 861 is press-fitted with the inner wall of the second connecting pipe 83. Radially along the fluid channel 141, the second connecting pipe 83 is located between the connecting pipe section 14 and the second filter structure 86.

[0140] In a specific embodiment, the second connecting portion 861 is bent to form a third fold 8613 and a fourth fold 8614 connected to the third fold 8613. The third fold 8613 is press-fitted with the second connecting pipe 83. The length of the third fold 8613 is greater than that of the fourth fold 8614. The portion of the third fold 8613 located at the second opening 8612 that is longer than the fourth fold 8614 is pressed radially inward along the fluid channel 141 onto the second filter screen 862 to enhance the limiting assembly of the second filter screen 862.

[0141] For example, in this application, the first sealing ring, the second sealing ring, the third sealing ring, and other sealing elements are all O-rings.

[0142] On the one hand, during use, the threaded locking of the valve core assembly is prone to loosening during rotation, affecting the sealing performance; on the other hand, in actual use, due to the frequent rotation of the valve core rod and moving valve core, the grease on the seals will be consumed and evaporated, resulting in a reduction in the service life of the seals; this can easily affect the service life and reliability of the gate valve.

[0143] Therefore, referring to Figures 23-33, in some embodiments, the upper end face of the valve core shell 20 of this application is lower than the upper end face of the valve body 10, and a valve core shell limiting structure 87 for limiting the upward movement of the valve core shell 20 is also provided in the valve cavity 101 of the valve body 10 located above the valve core shell 20.

[0144] Understandably, on the one hand, when the valve core shell 20 is pushed back to the valve core shell limiting structure 87, the valve core shell limiting structure 87 limits and blocks the valve core shell 20, preventing the valve core shell 20 from continuing to push back towards the outlet of the valve body 10; on the other hand, the valve core shell limiting structure 87 also has a certain protective function. Specifically, once the thread seal of the valve core shell 20 fails, without the valve core shell limiting structure 87, the valve core shell 20 will fly out directly. The setting of the valve core shell limiting structure 87 can block the valve core shell 20, avoiding the safety hazards caused by the valve core shell 20 flying out directly.

[0145] In this embodiment, the distance between the lower end face of the valve core shell limiting structure 87 and the upper end face of the valve core shell 20 is defined as L, where L is the allowable upward deviation of the valve core shell 20, which refers to the maximum distance that the valve core shell 20 can push upward. Of course, in other embodiments, the distance between the lower end face of the valve core shell limiting structure 87 and the upper end face of the valve core shell 20 may also be less than the allowable upward deviation of the valve core shell 20.

[0146] The allowable upper difference L is related to the thread stroke of the valve core shell 20. When the simulated upward movement of the valve core shell 20 exceeds the thread stroke of the valve core shell 20, the valve core shell thread will disengage. In actual application, the allowable upper difference L needs to be determined according to the specifications of the applicable valve core shell, and then the position of the valve core shell limiting structure 87 is determined.

[0147] In this embodiment, the thread travel of the valve core shell is 4±0.3mm, that is, the allowable upper difference L value is 4±0.3mm.

[0148] Understandably, when the distance between the lower end face of the valve core shell limiting structure 87 and the upper end face of the valve core shell 20 is too large, the valve core shell limiting structure 87 cannot effectively limit the valve core shell 20 in a timely manner, causing the valve core shell 20 to sway up and down, making it impossible to completely avoid safety hazards and affecting the service life of the gate valve. Setting the distance between the lower end face of the valve core shell limiting structure 87 and the upper end face of the valve core shell 20 as the allowable upper difference of the valve core shell 20 can achieve effective limiting of the valve core shell 20 while maximizing the function of the valve core shell limiting structure 87.

[0149] In this embodiment, the valve core shell limiting structure 87 is configured as a retaining ring 871. A retaining ring groove 105 is provided circumferentially on the inner wall of the valve body 10. The outer circumferential side of the retaining ring 871 is engaged in the retaining ring groove 105 and forms an abutment with the retaining ring groove 105. The inner circumferential side of the retaining ring 871 is located outside the retaining ring groove 105. It can be understood that the outer circumferential side of the retaining ring 871 is located in the retaining ring groove 105, realizing the fixed connection between the retaining ring 871 and the valve body 10. The inner circumferential side of the retaining ring 871 extends out of the retaining ring groove 105. When the valve core shell 20 moves upward and abuts against the lower end face of the retaining ring 871, it can prevent the valve core shell 20 from moving further upward, thereby limiting the valve core shell 20. In this embodiment, the structure of the retaining ring 871 and the retaining ring groove 105 is simple and reliable. The annular design of the retaining ring 871 can provide blocking force in the entire annular direction, which can realize the full circumferential limitation of the valve core shell 20.

[0150] Of course, in other embodiments, the valve core shell limiting structure 87 may also take other forms, such as multiple limiting blocks that are circumferentially distributed along the inner wall of the valve body 10.

[0151] Furthermore, the depth of the retaining ring groove 105 is not less than 1 / 2 and not greater than 4 / 5 of the ring diameter of the retaining ring 871, and the height of the retaining ring groove 105 is not greater than the ring diameter of the retaining ring 871. Specifically, in this embodiment, the depth of the retaining ring groove 105 is 1 / 2 of the ring diameter of the retaining ring 871, and the height of the retaining ring groove 105 is the same as the ring diameter of the retaining ring 871. Of course, in other embodiments, the depth of the retaining ring groove 105 can also be 2 / 3, 3 / 5, or 4 / 5 of the ring diameter of the retaining ring 871, and the height of the retaining ring groove 105 can also be slightly less than the ring diameter of the retaining ring 871.

[0152] Understandably, if the depth of the retaining ring groove 105 is too large, the portion of the retaining ring 871 protruding from the groove will be too small to effectively limit the valve core shell 20. If the depth of the retaining ring groove 105 is too small, the connection between the retaining ring 871 and the valve body 10 will be unstable, posing a risk of detachment from the valve body 10 due to impact from the valve core shell 20. Setting the depth of the retaining ring groove 105 to be no less than 1 / 2 and no more than 4 / 5 of the diameter of the retaining ring 871 ensures both a stable connection with the valve body 10 and effective blocking of the valve core shell 20. Similarly, if the height of the retaining ring groove 105 is too large, it will affect the stability of the connection between the retaining ring 871 and the valve body 10. If it is too small, the shape of the retaining ring 871 will be deformed by compression, posing a safety hazard in effectively blocking the valve core shell 20. Setting the height of the retaining ring groove 105 to be the same as the diameter of the retaining ring 871 ensures both the unchanged shape of the retaining ring 871 and a stable connection with the valve body 10.

[0153] Furthermore, to extend the service life of the seals, in some embodiments, the shut-off valve is also provided with an oil replenishment structure 88. The oil replenishment structure 88 is located within a preset diameter range on the outer periphery of the first sealing ring 63, the second sealing ring 64, or the third sealing ring 65, and is used to replenish oil to the first sealing ring 63 or the second sealing ring 64.

[0154] As shown in Figure 23, in one embodiment, a second sealing ring 64 is provided between the valve core shell 20 and the inner sidewall of the valve body 10, and a second sealing groove 27 is provided between the outer sidewall of the valve core shell 20 and the inner sidewall of the valve body 10. The oil replenishment structure 88 is a first oil storage groove 881 provided on the outer sidewall of the valve core shell 20 or the inner sidewall of the valve body 10 within a preset diameter range on the outer periphery of the second sealing ring 64.

[0155] Specifically, as shown in Figures 24-26, along the axial direction of the valve cavity, the oil replenishment structure 88 is provided on the first oil storage groove 881 on the outer side wall of the valve core shell 20 on both sides of the second sealing groove 27; the first oil storage groove 881 is a U-shaped groove with its opening facing the second sealing groove 27.

[0156] Of course, in other embodiments, the oil replenishment structure 88 may simply be a first oil reservoir 881 on the outer wall of the valve core housing 20 above or below the second sealing groove 27. Alternatively, it may be a first oil reservoir 881 located within the second sealing groove 27 on the inner wall of the valve body 10. The specific location can be determined according to the situation and is not limited here. The oil replenishment structure 88 may also be presented in other structural forms, as long as it can perform the function of replenishing oil.

[0157] Understandably, when the grease attached to the second sealing ring 64 evaporates due to frequent agitation, the grease in the first oil reservoir 881 designed on the upper and lower sides of the second sealing groove 27 on the outer side wall of the valve core housing 20 can be replenished in time, which can give the second sealing ring 64 a longer service life compared to the conventional structure.

[0158] Furthermore, in this embodiment, a plating layer is added to the outer wall of the valve core rod 30. The plating layer can further improve the surface finish of the valve core rod 30, reduce friction, and thus improve the service life of the main rod.

[0159] As shown in Figures 23 and 28, in one embodiment, two first sealing rings 63 are spaced apart along the axial direction of the valve core rod 30, and first sealing grooves 31 are opened opposite to each other on the circumferential side wall of the valve core rod 30 and the inner side wall of the valve core shell 20. The first sealing rings 63 are respectively placed in one of the first sealing grooves 31, and at least one oil replenishing structure 88 is provided between the two first sealing rings 63.

[0160] In this embodiment, the oil replenishment structure 88 is a second oil reservoir 882 formed on the outer wall of the valve core rod 30 between the two first sealing rings 63. In this embodiment, the first sealing ring 63 and the second sealing ring 64 are O-rings.

[0161] Understandably, the valve core rod 30 uses a soft-seal double-O structure. Since the valve core rod 30 rotates more frequently during actual use, at least one second oil reservoir 882 is added between the two first sealing rings 63. During assembly, grease can be injected into the second oil reservoir 882. During operation, the grease in the second oil reservoir 882 will continuously replenish the surface of the first sealing ring 63 to reduce the friction between the first sealing ring 63 and the outer wall, thereby improving its service life and preventing wear between the first sealing ring 63 and the upper and lower stop structures due to grease loss on the surface of the first sealing ring 63.

[0162] As shown in Figure 29, in one embodiment, at least one second oil reservoir 882 is respectively provided on the outer wall of the valve core rod 30 outside the two first sealing rings 63. Referring to Figure 7, in this embodiment, there is one second oil reservoir 882 on each side of the two first sealing rings 63. Of course, in other embodiments, the number of second oil reservoirs 882 on each side may be the same or different, and the number may be one or two, etc.

[0163] Understandably, adding at least one second oil reservoir 882 to the outside of each of the two first sealing rings 63 can store more grease. During the operation of the valve core rod 30, the grease in the second oil reservoir 882 is more likely to continuously replenish the surface of the first sealing ring 63, thereby reducing the friction between the first sealing ring 63 and the outer wall and thus improving the service life of the first sealing ring 63.

[0164] As shown in Figure 30, in one embodiment, the second oil reservoir 882 is disposed on the side wall where the valve core housing 20 contacts the valve core rod 30. The position of the second oil reservoir 882 on the valve core rod 30 can be located between the two first sealing rings 63. As shown in Figure 31, in one embodiment, the second oil reservoir 882 can also be located outside the two first sealing rings 63. Alternatively, it can be disposed both between the two first sealing rings 63 and on the outside.

[0165] As shown in Figure 32, in one embodiment, the oil replenishment structure 88 is a lubricating oil storage cavity 883 disposed in the first sealing ring 63. Multiple oil outlet holes 801 and an oil injection hole 802 communicating with the lubricating oil storage cavity 883 are evenly distributed on the circumferential sidewall of the first sealing ring 63. A sealing cap 803 is provided in the oil injection hole 802. The diameter of the oil outlet hole 801 is less than 1 mm.

[0166] It is understandable that the valve core rod 30 rotates many times during actual use. During the rotation of the valve core rod 30, the lubricating oil in the lubricating oil storage chamber 883 flows out from the oil outlet 801 and continuously replenishes the surface of the first sealing ring 63.

[0167] As shown in Figure 33, in one embodiment, the first sealing ring 63 and / or the second sealing ring 64 are irregularly shaped sealing rings. The four sides of the irregularly shaped sealing ring are all W-shaped. The annular channel formed by the concave area 602 on the four sides of the irregularly shaped sealing ring and the side wall of the first sealing groove 31 or the side wall of the second sealing groove 27 on the valve core rod 30 and the valve core shell 20 is the oil replenishment structure 88.

[0168] It should be further noted that in some embodiments, when other sealing elements are provided, an oil replenishment structure 88 can be provided on the periphery of the sealing elements, including but not limited to the periphery of the first sealing ring 63, the second sealing ring 64, the third sealing ring 65, etc. The specific structure of the oil replenishment structure 88 can be selected according to the requirements, and will not be detailed here. It can also be understood that other sealing elements can be irregularly shaped sealing rings.

[0169] 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.

[0170] 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 protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A shut-off valve, characterized in that, The shut-off valve includes: A valve body having a valve cavity, wherein the valve body has a first valve port and a second valve port communicating with the valve cavity; and A valve core assembly includes a moving valve core and a stationary valve core. The stationary valve core is disposed in the valve cavity and located between the first valve port and the second valve port. The stationary valve core has a first flow hole that connects the first valve port and the second valve port. The moving valve core abuts against the stationary valve core at one end and is rotatable relative to the stationary valve core. When the moving valve core rotates to the projection area of ​​the first flow hole in the axial direction of the stationary valve core, the moving valve core covers the first flow hole, and the first valve port and the second valve port are in a disconnected state.

2. The shut-off valve according to claim 1, wherein, The valve core assembly further includes a valve core shell and a valve core rod. The valve core shell is connected to the valve body, and a hollow cavity is constructed inside the valve core shell. A second flow hole is provided on the cavity wall of the hollow cavity formed by the valve core shell. The hollow cavity can communicate with the first valve port through the first flow hole, and the hollow cavity can communicate with the second valve port through the second flow hole. The valve core rod is located at least partially within the hollow cavity. One end of the valve core rod is connected to an external drive source, and the other end is connected to the moving valve core. The valve core shell and the valve core rod are coaxially arranged. The valve core rod can rotate around its own axis under the drive of the external drive source to drive the moving valve core to rotate.

3. The shut-off valve according to claim 2, wherein, At least a portion of the outer periphery of the stationary valve core is circular, and the outer periphery of the stationary valve core abuts against the inner wall of the valve core shell circumferentially; at least a portion of the outer periphery of the moving valve core is circular, and the stationary valve core and the moving valve core are coaxially arranged. At least two first flow holes are provided, and at least two first flow holes are rotationally symmetrical about the center of the stationary valve core; The first flow hole is fan-shaped, and the moving valve core includes a connecting section and multiple sealing sections. The multiple sealing sections are located on the outer periphery of the connecting section and are all connected to the connecting section. The sealing sections are also fan-shaped. As the moving valve core rotates, each sealing section covers one of the first flow holes.

4. The shut-off valve according to claim 3, wherein, Two first flow holes are provided and are symmetrically arranged with respect to the center of the stationary valve core; at least one positioning block is protruding on the inner wall of the valve core shell forming the hollow cavity. As the valve core rod rotates, the valve core rod abuts against the positioning block. The line connecting the midpoint of the positioning block and the center of the stationary valve core forms a 90° angle with the line connecting the midpoints of the two first flow holes.

5. The shut-off valve according to claim 2, wherein, The outer periphery of the stationary valve core is provided with at least one first anti-rotation portion, and the inner wall of the valve core shell is provided with at least one second anti-rotation portion, wherein the first anti-rotation portion is embedded in the second anti-rotation portion; and / or, The movable valve core has a mating groove, and the valve core rod has a mating protrusion at one end near the movable valve core, the protrusion being inserted into the mating groove; and / or The shut-off valve further includes a motor, which is connected to the moving valve core; and / or The valve core shell and the valve body are connected by welding.

6. The shut-off valve according to claim 2, wherein, The valve core housing is disposed within the valve body, and the valve core rod is disposed within the valve core housing and cooperates with the valve core housing to form the valve core assembly; the valve core assembly further includes a first sealing gasket and a second sealing gasket, the first sealing gasket being located at the end of the valve core rod away from the first valve port and pressed against the inner wall of the hollow cavity by the valve core rod, and the second sealing gasket being located at the end of the valve core housing near the first valve port, and located between the valve core housing and the valve body, and pressed against the valve body by the valve core housing; and / or, At least one first sealing groove is provided on the outer periphery of the valve core rod, and a first sealing ring is embedded in the first sealing groove. The outer periphery of the first sealing ring abuts against the inner wall of the hollow cavity of the valve core shell.

7. The shut-off valve according to claim 2, wherein, The valve core shell is threadedly connected to the valve body. The valve core assembly also includes a second sealing ring, which is located at the end of the valve core shell away from the first valve port and is pressed against the valve body by the valve core shell.

8. The shut-off valve according to claim 7, wherein, A second sealing groove is provided between the upper part of the valve core shell, which is relatively far from the first valve port, and the valve body. The second sealing ring is embedded in the second sealing groove and abuts against the valve core shell and the valve body respectively. Wherein, the second sealing groove is formed by the outer side wall of the valve core shell being concave in the radial direction of the valve cavity; or, the second sealing groove is formed by the inner side wall of the valve body being concave in the radial direction of the valve cavity; or, the second sealing groove is formed by a portion of the outer side wall of the valve core shell and a portion of the inner side wall of the valve body enclosing the valve cavity along the axial direction.

9. The shut-off valve according to claim 6 or 8, wherein, The shut-off valve is also provided with an oil replenishing structure, which is located within a preset diameter range on the outer periphery of the sealing element. The sealing element is configured as a first sealing ring or a second sealing ring, and the oil replenishing structure contains lubricating grease.

10. The shut-off valve according to claim 9, wherein, The oil replenishment structure is a first oil reservoir located on the outer wall of the valve core housing or the inner wall of the valve body within a preset diameter range on the outer periphery of the second sealing ring; or, Two first sealing grooves are provided at intervals along the axial direction of the valve core rod, and a first sealing ring is embedded in each first sealing groove. At least one oil replenishing structure is provided between the two first sealing rings. The oil replenishing structure is a second oil storage groove opened on the outer side wall of the valve core rod between the two first sealing rings.

11. The shut-off valve according to claim 1, wherein, The valve core assembly further includes a valve core housing and a valve core rod, the valve core housing being connected to the valve body, and the valve core rod being at least partially inserted into the valve core housing; The shut-off valve also includes an anti-wear component, which is disposed between the valve core rod and the valve core shell, and the anti-wear component abuts against the valve core rod and the valve core shell respectively.

12. The shut-off valve according to claim 11, wherein, Along the height direction of the valve cavity, the valve core rod includes a sealing section and an inner section. The sealing section passes through the valve core shell. One end of the inner section is connected to the sealing section, and the other end is connected to the moving valve core. The inner section has a top facing away from the first valve port, and the valve core shell has a bottom facing the first valve port. The anti-wear member is disposed between the top and the bottom.

13. The shut-off valve according to claim 12, wherein, The wear-resistant component is a bearing component, wherein along the height direction of the valve cavity, the top surface of the bearing component abuts against the bottom of the valve core shell, and the bottom surface of the bearing component abuts against the top of the inner section; and / or, The valve core rod also includes an outer section, which is connected to the sealing section. One end of the outer section is provided with a drive engagement part that connects to an external drive source.

14. The shut-off valve according to any one of claims 12-13, wherein, The shut-off valve further includes a limiting member disposed within the valve cavity; the limiting member is sleeved on the outer periphery of the inner connecting section and abuts against the inner wall of the valve cavity; the outer side of the limiting member is provided with at least one protrusion, and the inner wall of the valve cavity is provided with a recess that cooperates with the protrusion.

15. The shut-off valve according to any one of claims 11-13, wherein, The valve cavity wall near the first valve port has a second step protruding into the valve cavity, and the shut-off valve also includes a third sealing ring disposed between the stationary valve core and the first valve port. The second step has a third sealing groove, and the third sealing ring is at least partially embedded in the third sealing groove to form a sealing fit with the static valve core and the first valve port respectively.

16. The shut-off valve according to claim 1, wherein, The valve body is also configured with a first port and a second port communicating with the valve cavity, and the first port, the first valve port, the second valve port and the second port are spaced apart and connected in sequence, and the valve cavity has an axial direction; the shut-off valve also includes a first connecting pipe, a first filter structure and a second filter structure; The first connecting pipe is connected to the first port of the valve body; The first filter structure is located on the side of the static valve core near the first port. The first filter structure is provided with a first connecting part, which is assembled in the valve body and / or the first connecting pipe. The second filter structure is provided with a second connecting part and is installed on the side of the static valve core near the second port through the second connecting part; Along the fluid flow direction, the moving valve core and the stationary valve core are located between the first filter structure and the second filter structure.

17. The shut-off valve according to claim 16, wherein, The valve cavity wall near the first port protrudes inward to form a second step, and the stationary valve core is installed and abuts against the side of the second step facing the valve cavity. The outer diameter of the stationary valve core is larger than the inner diameter of the second step. The first connecting pipe passes through the first port and is inserted into the valve cavity; along the axial direction of the valve cavity, the first connecting portion is located between the second step and the end face of the first connecting pipe, and the first connecting portion is welded to at least the second step or the first connecting pipe.

18. The shut-off valve according to claim 17, wherein, The first connecting portion is bent to form a first clamping cavity and a first opening communicating with the first clamping cavity. The first opening is radially toward the cavity wall of the valve cavity. The first filter structure further includes a first filter screen. The edge of the first filter screen is provided with a first bent section. The first bent section extends into the first clamping cavity from the first opening. The cavity wall of the first clamping cavity clamps the first bent section. Along the thickness direction of the first bend, at least one side of the first connecting portion is used to connect the second step or the first connecting pipe.

19. The shut-off valve according to claim 16, wherein, The valve cavity wall near the first port protrudes inward to form a second step, and the stationary valve core is installed and abuts against the side of the second step facing the valve cavity. The outer diameter of the stationary valve core is larger than the inner diameter of the second step. The shut-off valve also includes a third sealing ring; the end face of the second step facing the moving valve core is recessed inward along the axial direction to form a third sealing groove, the third sealing groove accommodates the third sealing ring, and along the axial direction of the valve cavity, the third sealing ring is pressed between the stationary valve core and the bottom of the third sealing groove; The third sealing ring is partially embedded in the third sealing groove, and the portion protruding from the third sealing groove constitutes a sealing connection part; the sealing connection part is pressed between the static valve core and the second step, and the sealing connection part is connected to the first connecting part.

20. The shut-off valve according to claim 19, wherein, The first connecting portion is bent to form a first clamping cavity and a first opening communicating with the first clamping cavity, the first opening being radially toward the cavity wall of the valve cavity; The first filter structure further includes a first filter screen, the edge of which is provided with a first bent section, the first bent section extending from the first opening into the first clamping cavity, and the cavity wall of the first clamping cavity clamping the first bent section; The first connecting part and the first bent section are respectively injection molded into an integral structure with the sealing mating part.

21. The shut-off valve according to claim 16, wherein, The valve cavity wall near the first port protrudes inward to form a second step, and the stationary valve core is installed and abuts against the side of the second step facing the valve cavity. The outer diameter of the stationary valve core is larger than the inner diameter of the second step. The inner wall of the first connecting pipe is press-fitted with the first connecting part, and the first connecting pipe is inserted into the valve cavity and abuts against the second step.

22. The shut-off valve according to claim 21, wherein, The first connecting portion is bent to form a first clamping cavity and a first opening communicating with the first clamping cavity. The first opening is arranged axially away from the moving valve core along the valve cavity. The first filter structure also includes a first filter screen, which extends into the first clamping cavity from the first opening. The outer peripheral wall of the first connecting portion is press-fitted with the inner wall of the first connecting pipe.

23. The shut-off valve according to claim 17, 19, or 21, wherein, The valve body sidewall forms a connecting pipe section in the direction away from the valve body, and the connecting pipe section is constructed with a fluid channel communicating with the valve cavity. The end of the connecting pipe section forms the second port. The second filter structure is installed on the pipe section via the second connection portion and is at least partially located in the fluid channel.

24. The shut-off valve according to claim 23, wherein, The second filter structure is located entirely within the fluid channel, and the second connection part is interference-fitted with the inner wall of the pipe section; The second filtration structure further includes a second filter screen connected to the second connecting portion, and the second connecting portion is located between the second filter screen and the second port along the axial direction of the fluid channel.

25. The shut-off valve according to claim 24, wherein, Along the axial direction of the fluid channel, the length of the second filter structure is less than the length of the fluid channel.

26. The shut-off valve according to claim 23, wherein, The valve body sidewall is provided with a connecting pipe section protruding outward, and the connecting pipe section is constructed with a fluid channel communicating with the valve cavity. The end of the connecting pipe section forms the second port. The shut-off valve further includes a second filter structure and a second connecting pipe. The second filter structure is configured with a second connecting portion, which is at least connected to the second connecting pipe. The second connecting pipe passes through a second port and is inserted into the fluid channel.

27. The shut-off valve according to claim 26, wherein, The connecting pipe section is recessed inward along the axial direction of the fluid channel at the end face where the second port is located to form a limiting groove; The second connecting part is located between the bottom of the limiting groove and the end face of the second connecting pipe facing the fluid channel. The second connecting part is welded to at least the bottom of the limiting groove or the second connecting pipe. Alternatively, the second connecting part is interference-fitted with the inner wall of the second connecting pipe, and at least the second connecting pipe abuts against the bottom of the limiting groove. Along the radial direction of the fluid channel, the second connecting pipe is located between the connecting pipe section and the second filter structure.

28. The shut-off valve according to claim 1, wherein, The valve core assembly further includes a valve core housing and a valve core rod, the valve core housing being connected to the valve body, and the valve core rod at least partially passing through the valve core housing; Along the height direction of the valve cavity, the upper end face of the valve core shell is lower than the upper end face of the valve body. A valve core shell limiting structure is also provided in the valve cavity located above the valve core shell, and the valve core shell limiting structure is connected to the valve body.

29. The shut-off valve according to claim 28, wherein, The distance between the lower end face of the valve core shell limiting structure and the upper end face of the valve core shell is defined as L, where L is the allowable upward deviation of the valve core shell, and the allowable upward deviation refers to the maximum distance that the valve core shell can push upward.

30. The shut-off valve according to claim 29, wherein, The valve core shell limiting structure is configured as a retaining ring. A retaining ring groove is formed by an inward recess on the circumferential direction of the side wall of the valve cavity. The outer circumferential side of the retaining ring is engaged in the retaining ring groove and abuts against the retaining ring groove. The inner circumferential side of the retaining ring is located outside the retaining ring groove.

31. The shut-off valve according to claim 30, wherein, The depth of the retaining ring groove is not less than 1 / 2 and not greater than 4 / 5 of the retaining ring diameter, and the height of the retaining ring groove is not greater than the retaining ring diameter.

Images