Pneumatic stop valve

Abstract

The utility model discloses pneumatic stop valve, including valve body, be provided with upper cavity, lower cavity, liquid outlet cavity and liquid inlet pipe in, upper cavity is linked together with lower cavity, and liquid outlet cavity and liquid inlet pipe all are linked together with lower cavity, pneumatic assembly, including first air pipe, second air pipe, piston cylinder and piston, piston cylinder is detachably built -in in upper cavity, and the piston cylinder is provided with movable cavity, and the top surface of movable cavity is linked together with first air pipe, second air pipe sets up in the outside of valve body and its gas -outlet end extends to the bottom of piston, and piston is movably arranged in movable cavity, valve core structure is located in lower cavity and is connected with piston in one end, the scheme is through the air pressure and promotes the piston to go up and down movement to make valve core structure open or close the communication port of lower cavity and liquid outlet cavity fast.

Description

Technical Field

[0001] This utility model relates to the technical field of valves, and more particularly to pneumatic shut-off valves. Background Technology

[0002] A gate valve controls the flow of fluid in a pipeline. By opening or closing the valve, it can cut off the flow of fluid or regulate the flow rate.

[0003] In some related technologies, such as the patent with publication number CN119042392A, a pneumatic shut-off valve is disclosed, including: a valve body, in which a water passage chamber one and a water passage chamber two are opened, and a water passage port is opened on the side wall of the water passage chamber one; a switching assembly, which includes a guide mechanism disposed on the valve body and a switching valve inserted in the guide mechanism; and a pneumatic assembly, which includes a cylinder body disposed on the guide mechanism, a piston disposed inside the cylinder body and disposed on the switching valve, an upper cover mechanism disposed on the cylinder body and sleeved on the switching valve, and a spring disposed between the upper cover mechanism and the piston. By injecting air into the cylinder body, the piston moves along the inner wall of the cylinder body, driving the switching valve to move upward along the guide mechanism, and the spring stores energy. The switching valve moves away from the water passage port, connecting the water passage chamber one and the water passage chamber two, venting the gas in the cylinder body, resetting the spring, driving the piston to reset, thereby causing the switching valve to move downward, causing the switching valve to block the water passage port again, separating the water passage chamber one and the water passage chamber two.

[0004] There is a problem with this solution: after the gas in the cylinder is discharged, the piston and the switching valve are reset by the elastic return of the spring. The reset speed of the spring may be affected by the spring material, elastic coefficient, and assembly precision, resulting in a slow closing speed of the switching valve, especially during high-frequency operation, which may lead to a failure to respond quickly. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technical solutions, this utility model provides a pneumatic shut-off valve.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A pneumatic shut-off valve, the pneumatic shut-off valve comprising:

[0008] The valve body is provided with an upper cavity, a lower cavity, a liquid outlet channel, and a liquid inlet pipe; the upper cavity is connected to the lower cavity, and the liquid outlet channel and the liquid inlet pipe are both connected to the lower cavity;

[0009] A pneumatic assembly includes a first vent pipe, a second vent pipe, a piston cylinder, and a piston. The piston cylinder is detachably housed within the upper cavity and has a movable chamber. The top surface of the movable chamber is connected to the first vent pipe. The second vent pipe is located outside the valve body, and its outlet extends to the bottom of the piston. The piston is movably disposed within the movable chamber and positioned between the first vent pipe and the vent.

[0010] A valve core structure is located in the lower cavity and one end of it is connected to the piston. The piston can drive the valve core structure to move closer to or away from the connection between the liquid outlet channel and the lower cavity.

[0011] In a preferred embodiment of this utility model, the valve core structure includes a connecting rod and a valve core; one end of the connecting rod is connected to the piston, and the other end of the connecting rod is detachably connected to the valve core.

[0012] As a preferred embodiment of the present invention, the outer wall of the valve core is provided with an inclined surface from bottom to top outward.

[0013] In a preferred embodiment of the present utility model, the piston cylinder includes a cylinder barrel and a bottom cover; the bottom cover is detachably disposed on the cylinder barrel; the movable chamber is located between the cylinder barrel and the bottom cover, and a vent is provided at the connection between the cylinder barrel and the bottom cover for communicating with a second vent pipe;

[0014] The piston is located between the first vent pipe and the vent.

[0015] In a preferred embodiment of this utility model, the bottom cover has a through guide hole, and the valve core structure movably passes through the guide hole.

[0016] As a preferred embodiment of the present utility model, the cavity wall of the lower cavity is provided with an annular limiting protrusion extending from the bottom of the bottom cover.

[0017] As a preferred embodiment of the present utility model, a first sealing sleeve is provided between the outer wall of the cylinder and the cavity wall of the upper cavity, and the outer wall of the first sealing sleeve is interference-fitted with the inner wall of the upper cavity.

[0018] A second sealing sleeve is fitted between the bottom of the bottom cover and the top surface of the annular limiting protrusion, and / or a second sealing sleeve is fitted between the outer wall of the bottom cover and the cavity wall of the upper cavity.

[0019] In a preferred embodiment of this utility model, a third sealing sleeve is provided between the outer wall of the piston and the cavity wall of the movable cavity.

[0020] As a preferred embodiment of this utility model, multiple pneumatic shut-off valves are provided, and adjacent pneumatic shut-off valves are detachably connected.

[0021] The adjacent liquid outlet channels are interconnected.

[0022] In a preferred embodiment of this utility model, each of the pneumatic shut-off valves has a through-hole, and adjacent locking holes are connected.

[0023] The pneumatic shut-off valve also includes a locking element, which is inserted into each of the locking holes.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] When compressed air is introduced into the second vent pipe, the compressed air flows into the movable chamber through the vent, which quickly pushes the piston upward and moves the valve core structure away from the connection between the liquid outlet chamber and the lower chamber, thus quickly opening the connection. When the supply of compressed air to the second vent pipe stops and compressed air is output into the movable chamber through the first vent pipe, the piston quickly moves downward and blocks the connection between the liquid outlet chamber and the lower chamber through the valve core structure, thus quickly closing the connection. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is an overall structural diagram of an embodiment of the present utility model.

[0028] Figure 2 This is a structural cross-sectional view of the valve body according to an embodiment of the present utility model.

[0029] Figure 3 yes Figure 2 The main view.

[0030] Figure 4 This is an exploded view of the valve body and pneumatic components according to an embodiment of the present invention.

[0031] Figure 5 This is a structural cross-sectional view of the pneumatic component according to an embodiment of the present invention.

[0032] Figure 6 yes Figure 5 Exploded view of the structure.

[0033] Figure 7 This is an exploded view of the valve body and locking component according to an embodiment of the present invention.

[0034] Numbers in the diagram

[0035] 1. Valve body; 11. Upper cavity; 111. Annular limiting protrusion; 12. Inlet pipe; 13. Outlet channel; 14. First sealing sleeve; 15. Second sealing sleeve; 16. Connecting port; 17. Lower cavity;

[0036] 2. Pneumatic assembly; 21. First vent pipe; 22. Second vent pipe; 23. Piston cylinder; 231. Cylinder barrel; 232. Bottom cover; 233. Guide hole; 234. Moving chamber; 235. Vent port; 24. Valve core structure; 241. Connecting rod; 242. Valve core; 2421. Inclined surface; 25. Piston; 26. Vent chamber; 27. Third sealing sleeve;

[0037] 3. Locking hole;

[0038] 4. Locking components. Detailed Implementation

[0039] To make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following describes this application in further detail with reference to the accompanying drawings and embodiments.

[0040] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0041] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or indirectly on that other component.

[0042] When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to that other component.

[0043] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] 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 with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0045] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0046] The following describes in detail the specific structure of a pneumatic shut-off valve provided by an embodiment of this utility model, according to the appendix. Figure 1-6 As shown, the specific structure of the pneumatic shut-off valve includes a valve body 1 and a pneumatic assembly 2.

[0047] The valve body 1 is provided with an upper cavity 11, a lower cavity 17, an outlet cavity 13 and an inlet pipe 12. The outlet cavity 13 and the inlet pipe 12 are both connected to the lower cavity 17.

[0048] Specifically, one end of the inlet pipe 12 is connected to the lower cavity 17, and the outlet cavity 13 is located below the lower cavity 17. There is a connecting port 16 between the lower cavity 17 and the outlet cavity 13. In this way, the liquid first flows into the lower cavity 17, then flows from the lower cavity 17 into the outlet cavity 13, and finally flows out through the outlet cavity 13.

[0049] Specifically, when the pneumatic shut-off valve is in the closed state, the pneumatic assembly 2 is used to block the connection port 16 between the inlet pipe 12 and the outlet channel 13 of the lower cavity 17. At this time, liquid cannot flow from the inlet pipe 12 into the outlet channel 13. When the pneumatic shut-off valve is in the open state, the pneumatic assembly 2 is used to open the connection port 16 between the lower cavity 17 and the outlet channel 13, allowing liquid to flow from the inlet pipe 12 into the outlet channel 13. Therefore, only the pneumatic assembly 2 needs to be activated to control the flow of air to open or close the connection port 16 between the inlet pipe 12 and the outlet channel 13 of the lower cavity 17.

[0050] The pneumatic assembly 2 includes a first vent pipe 21, a second vent pipe 22, a piston cylinder 23, a valve core structure 24, and a piston 25. The piston cylinder 23 is detachably built into the upper cavity 11, and a movable chamber 234 is provided inside the piston cylinder 23. The top surface of the movable chamber 234 is connected to the first vent pipe 21. The second vent pipe 22 is located on the outside of the valve body 1, and its outlet end extends to the bottom of the piston 25. The piston 25 is movably disposed in the movable chamber 234 and is located between the first vent pipe 21 and the vent 235. One end of the valve core structure 24 is connected to the piston 25, and the piston 25 can drive the valve core structure 24 to move closer to or away from the communication port 16 between the lower cavity 17 and the liquid outlet channel 13.

[0051] It is understood that the cavity wall of the active cavity 234 in this embodiment of the present invention has a vent 235, and a venting cavity 26 for connecting the vent 235 and the second venting pipe 22 is provided between the piston cylinder 23 and the cavity wall of the upper cavity 11.

[0052] Specifically, the piston cylinder 23 has a movable chamber 234 inside, which is used to accommodate the piston 25 for vertical movement; that is, the movable chamber 234 serves as the movement space for the piston 25. The top surface of the movable chamber 234 is connected to the first vent pipe 21, which is connected to an external air source. The cavity wall of the movable chamber 234 has a vent 235, and the second vent pipe 22 is also connected to an external air source. Since a vent chamber 26 is provided between the piston cylinder 23 and the cavity wall of the upper cavity 11, gas can flow into the movable chamber 234. The piston 25 is movably disposed in the movable chamber 234, and its movement direction is consistent with the vertical direction. Therefore, the piston 25 can be driven to move up and down by generating a pressure difference. Since one end of the valve core structure 24 is connected to the piston 25, the movement of the piston 25 can drive the valve core structure 24 to move closer to or away from the connection port 16 between the lower cavity 17 and the liquid outlet channel 13, thereby controlling the flow of liquid.

[0053] Specifically, in the initial state, the piston 25 is located at the lower end of the movable chamber 234. At this time, the valve core structure 24 is close to the connection port 16 between the lower chamber 17 and the liquid outlet channel 13, completely blocking the channel and preventing liquid from passing through. When compressed air is introduced into the second vent pipe 22, the compressed air enters the movable chamber 234 through the second vent pipe 22 and the vent port 235, pushing the piston 25 upward. When the piston 25 moves upward, it can simultaneously drive the valve core structure 24 to move upward as well, thereby gradually moving away from the connection port 16 between the lower chamber 17 and the liquid outlet channel 13. When the liquid channel is opened, the liquid can flow from the inlet pipe 12 into the liquid outlet channel 13. At the same time, since the intake pressure output by the second vent pipe 22 is greater than the exhaust pressure of the first vent pipe 21, the piston 25 continues to rise under the action of the pressure difference. Conversely, when compressed air is stopped from being supplied to the second vent pipe 22 and compressed air is output from the first vent pipe 21, the compressed air enters the upper part of the movable chamber 234 through the first vent pipe 21, thereby rapidly pushing the piston 25 downward and causing the valve core structure 24 to move downward until it blocks the connection port 16 between the lower chamber 17 and the liquid outlet chamber 13, so that the liquid passage is closed and the liquid cannot pass through. At this time, the intake pressure output by the first vent pipe 21 is greater than the exhaust pressure of the second vent pipe 22, and the piston 25 remains in a downward state under the action of this pressure difference.

[0054] In the prior art, the piston 25 is pushed by a spring. The spring requires a certain amount of time to compress and release, resulting in a relatively slow response speed. In contrast, the present solution can introduce or expel compressed air instantly, which can make the piston 25 rise or fall rapidly.

[0055] It should be noted that both the first vent pipe 21 and the second vent pipe 22 in this embodiment of the present invention are equipped with one-way valves. A one-way valve is a valve that only allows compressed gas to flow in one direction, ensuring that compressed gas can only enter or exit from a specified direction, preventing reverse flow of compressed gas, thereby improving the accuracy of pneumatic control. For example, when compressed air is introduced into the movable chamber through the first vent pipe 21, the one-way valve built into the first vent pipe 21 ensures that compressed air can only enter the upper part of the movable chamber from the outside, preventing gas backflow and avoiding reverse gas flow caused by pressure fluctuations or misoperation.

[0056] In some specific embodiments, the piston cylinder 23 includes a cylinder barrel 231 and a bottom cover 232; the bottom cover 232 is detachably disposed on the cylinder barrel 231; the movable chamber 234 is located between the cylinder barrel 231 and the bottom cover 232; the vent 235 is located at the connection between the cylinder barrel 231 and the bottom cover 232; and the piston 25 is located between the first vent pipe 21 and the vent 235.

[0057] Specifically, the cylinder 231 and the bottom cover 232 are detachably connected, making the installation process of the entire pneumatic assembly 2 simpler and more efficient. During installation, internal components such as the piston 25 and the connecting rod of the valve core structure 24 can be assembled into the movable cavity 234 of the cylinder 231 first, and then the bottom cover 232 can be assembled into the cylinder 231 to complete the assembly. Furthermore, when maintenance or replacement of internal components of the pneumatic assembly 2 is required (such as the piston 25), the components inside the movable cavity 234 can be easily removed by simply removing and taking out the bottom cover 232. This design simplifies the overall maintenance process. For example, if the piston 25 seal is worn and needs replacement, the piston 25 can be directly removed for repair or replacement after removing the bottom cover 232, without needing to disassemble or replace the entire piston cylinder 23.

[0058] It is understood that the cavity wall of the movable cavity 234 in this embodiment of the present invention is provided with internal threads, and the outer side wall of the bottom cover 232 is provided with external threads. The bottom cover 232 is fixed by the engagement of the internal threads and the external threads.

[0059] In a further embodiment, the bottom cover 232 has a through guide hole 233, and the valve core structure 24 is movably inserted through the guide hole 233.

[0060] Specifically, the guide hole 233 serves to guide the movement of the valve core structure 24. The valve core structure 24 passes through the bottom cover 232 through the guide hole 233, ensuring that it can move up and down along the specified axis during movement, and preventing it from tilting or shaking during movement.

[0061] It is understood that the guide hole 233 in this embodiment of the present invention is cylindrical, and the connecting rod 241 of the valve core structure 24 is adapted to the shape of the guide hole 233. This arrangement can ensure that the valve core structure 24 always maintains axial symmetry during movement, thereby avoiding skewing or jamming caused by irregular shape.

[0062] In a further embodiment, since the piston cylinder 23 is detachably built into the upper cavity 11, the installation process of the entire pneumatic assembly 2 is more convenient and simple. It is understood that the outer wall of the cylinder 231 is provided with external threads, and the cavity wall of the upper cavity 11 is provided with internal threads. The external threads of the cylinder 231 and the internal threads of the upper cavity 11 engage to fix the entire piston cylinder 23.

[0063] Because the lower cavity 17 has an annular limiting protrusion 111 corresponding to the bottom of the bottom cover 232, the annular limiting protrusion 111 is used to connect with the bottom cover 232, and the limiting ring provides precise positioning for the entire piston cylinder 23. For example, during assembly, when the entire piston cylinder 23 is moved downward and contacts the limiting ring, the limiting ring locks the piston cylinder 23, preventing it from moving further downward and thus preventing it from deviating. This ensures that the piston cylinder 23 is located in the designated position within the upper cavity 11, thereby guaranteeing the assembly accuracy of the entire pneumatic assembly 2.

[0064] It is understood that the annular limiting protrusion 111 in this embodiment of the present invention is annular in shape.

[0065] In a further embodiment, a first sealing sleeve 14 is fitted between the outer wall of the cylinder 231 and the cavity wall of the upper cavity 11; a second sealing sleeve 15 is fitted between the bottom of the bottom cover 232 and the top surface of the annular limiting protrusion 111 and / or a second sealing sleeve 15 is fitted between the outer wall of the bottom cover 232 and the cavity wall of the upper cavity 11.

[0066] Specifically, the first sealing sleeve 14 is disposed between the outer wall of the cylinder 231 and the cavity wall of the upper cavity 11. This is configured to seal the gap between the cylinder 231 and the upper cavity 11, preventing gas from leaking out from the gap. That is, before compressed air enters the movable cavity 234 from the second vent pipe 22, the first sealing sleeve 14 can prevent gas from escaping from the gap between the cylinder 231 and the cavity wall. The second sealing sleeve 15 is disposed between the bottom of the bottom cover 232 and the top surface of the annular limiting protrusion 111. Its function is also to prevent compressed air from leaking out from the gap between the bottom cover 232 and the annular limiting protrusion 111. Before compressed air enters the movable cavity 234 from the second vent pipe 22, the second sealing sleeve 15 prevents compressed gas from escaping from the gap between the bottom cover 232 and the annular limiting protrusion 111. The first sealing sleeve 14 and the second sealing sleeve 15 work together to form a double seal, preventing the piston 25 from failing to rise stably due to the leakage of compressed gas.

[0067] It is understood that the first sealing sleeve 14 and the second sealing sleeve 15 in this embodiment of the present invention are both made of materials with elastic properties (such as rubber, polytetrafluoroethylene, etc.). Sealing sleeves made of such materials have good sealing performance and wear resistance, and can maintain the sealing effect under high pressure conditions.

[0068] In some specific embodiments, a third sealing sleeve 27 is fitted between the outer wall of the piston 25 and the cavity wall of the movable cavity 234.

[0069] Specifically, in the pneumatic system, the movement of the piston 25 requires precise air pressure control. Any gas leakage can easily cause the air pressure to drop, thereby affecting the movement accuracy of the piston 25. Therefore, by fitting the third sealing sleeve 27 between the outer wall of the piston 25 and the cavity wall of the movable cavity 234, when the piston 25 moves up and down in the movable cavity 234, the third sealing sleeve 27 tightly fits the outer wall of the piston 25 and the cavity wall of the movable cavity 234, forming a dynamic sealing barrier. By utilizing the sealing effect of the third sealing sleeve 27, it can be ensured that the air pressure in the movable cavity 234 remains stable when the piston 25 moves up and down, thereby ensuring that the piston 25 can move smoothly along the predetermined trajectory.

[0070] It is understood that the third sealing sleeve 27 of this utility model embodiment is made of a material with elastic properties (such as rubber, polytetrafluoroethylene, etc.).

[0071] In some specific embodiments, the valve core structure 24 includes a connecting rod 241 and a valve core 242; one end of the connecting rod 241 is connected to the piston 25, and the other end of the connecting rod 241 is detachably connected to the valve core 242.

[0072] Specifically, one end of the connecting rod 241 is connected to the piston 25, which can transmit the power of the piston 25 to the valve core 242. Therefore, when the piston 25 moves up and down under the action of the pneumatic assembly 2, the power is transmitted to the valve core 242 through the connecting rod 241, so that the valve core 242 can move closer to or away from the communication port 16 between the lower cavity 17 and the liquid outlet 13. The connecting rod 241 ensures that the movement and direction of the piston 25 and the valve core 242 can be synchronized.

[0073] Furthermore, the detachable connection between the valve core 242 and the connecting rod 241 facilitates the maintenance and replacement of the valve core 242. Since the valve core 242 is prone to wear after prolonged operation, this solution only requires replacing the valve core 242 individually, without replacing the entire connecting rod 241 or piston 25. For example, when the valve core 242 becomes worn or damaged, it can be simply disassembled from one end of the connecting rod 241 and removed, then a new valve core 242 can be installed. Therefore, it is not necessary to replace the entire valve core structure 24, thereby reducing maintenance costs.

[0074] It is understood that the outer side wall of the connecting rod 241 in this embodiment of the present invention is provided with external threads, the valve core 242 is provided with threaded holes, one end of the connecting rod 241 is inserted into the threaded hole and its external threads engage with the internal threads of the threaded hole to fix the valve core 242. This connection method facilitates quick disassembly and installation and is particularly suitable for use environments that require frequent replacement of the valve core 242.

[0075] In a further embodiment, the outer wall of the valve core 242 is provided with an inclined surface 2421 that extends outward from bottom to top.

[0076] Specifically, when the valve core 242 is driven by the piston 25, it descends to close the connection port 16 between the lower cavity 17 and the liquid outlet channel 13. As the inclined surface 2421 of the valve core 242 gradually contacts the connection port 16 between the lower cavity 17 and the liquid outlet channel 13, the contact between the valve core 242 and the connection port 16 is a gradual process, rather than an instantaneous hard contact. This causes the contact area between the valve core 242 and the connection port to gradually increase, thereby achieving a gradual seal. This design can effectively reduce the impact force caused by instantaneous contact, protecting the valve core 242 and the connection port 16 between the lower cavity 17 and the liquid outlet channel 13 from damage. In addition, when the inclined surface 2421 contacts the connection port 16 between the lower cavity 17 and the liquid outlet channel 13, it can evenly distribute the pressure across the entire contact surface, thereby improving the sealing performance and avoiding poor sealing caused by excessive local pressure.

[0077] In some specific embodiments, multiple pneumatic shut-off valves are provided, and adjacent pneumatic shut-off valves are detachably connected; adjacent liquid outlet channels 13 are interconnected.

[0078] Specifically, by interconnecting the outlet chambers 13 of multiple pneumatic shut-off valves, liquid can flow from one pneumatic shut-off valve to another, and finally enter the outlet chamber 13. This ensures that the liquid flows uniformly among the multiple pneumatic shut-off valves and flows to the commonly connected outlet chamber 13, and finally flows out from the outlet chamber 13. This arrangement allows the liquid to flow freely among the multiple shut-off valves and ensures that the outlet flow of each pneumatic shut-off valve is consistent, thereby achieving uniform distribution of the liquid.

[0079] Furthermore, each pneumatic shut-off valve in this embodiment can be controlled independently. That is, by individually controlling the pneumatic components 2 of each pneumatic shut-off valve, the connection port 16 between the lower cavity 17 and the liquid outlet 13 can be opened or closed. This setting can ensure that the flow rate of each pneumatic shut-off valve can be precisely adjusted according to actual needs.

[0080] Since the outlet chambers 13 of each pneumatic shut-off valve are interconnected, combined control can be achieved. For example, when it is necessary to increase the flow rate, all pneumatic shut-off valves can be activated simultaneously; when it is necessary to reduce the flow rate, some pneumatic shut-off valves can be closed. Through combined control, the flow rate of the liquid can be precisely adjusted within a certain range to meet different needs.

[0081] Specifically, each pneumatic shut-off valve has a through-hole 3, and adjacent locking holes 3 are connected; the pneumatic shut-off valve also includes a locking element 4, which is inserted into each locking hole 3.

[0082] Specifically, when the locking holes 3 of each pneumatic shut-off valve are connected to the corresponding locking holes 3 of the adjacent pneumatic shut-off valve, only one locking piece 4 needs to be inserted into each locking hole 3 at the same time. This can effectively prevent the pneumatic shut-off valve from loosening due to vibration or pressure changes during use, and ensure that the connection between each pneumatic shut-off valve can remain stable during long-term use, avoiding leakage or functional failure caused by loosening.

[0083] Furthermore, when it is necessary to maintain or replace each pneumatic shut-off valve, simply remove the locking part 4 from each locking hole 3, and then each pneumatic shut-off valve can be quickly disassembled. This simplifies the disassembly process of each pneumatic shut-off valve. Moreover, since each pneumatic shut-off valve can be disassembled independently, maintenance personnel can maintain or replace a specific pneumatic shut-off valve individually.

[0084] It is understood that each locking hole 3 in this embodiment of the present invention is a screw hole, and each locking element 4 is a bolt. That is, the locking element 4 is inserted into each screw hole at the same time, and its external thread engages with the internal thread of each screw hole to fix each pneumatic shut-off valve. Moreover, when disassembling, it is only necessary to twist the bolt until the bolt is disengaged from each screw hole to separate each pneumatic shut-off valve.

[0085] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A pneumatic shut-off valve, characterized in that, The pneumatic shut-off valve includes: The valve body includes an upper cavity, a lower cavity, a liquid outlet channel, and a liquid inlet pipe; the upper cavity is connected to the lower cavity, and the liquid outlet channel and the liquid inlet pipe are both connected to the lower cavity. A pneumatic assembly includes a first vent pipe, a second vent pipe, a piston cylinder, and a piston. The piston cylinder is detachably built into the upper cavity and has a movable chamber. The top surface of the movable chamber is connected to the first vent pipe. The second vent pipe is located outside the valve body, and its outlet extends to the bottom of the piston. The piston is movably disposed within the movable chamber. A valve core structure is located in the lower cavity and one end of it is connected to the piston. The piston can drive the valve core structure to move closer to or away from the connection between the liquid outlet channel and the lower cavity.

2. The pneumatic shut-off valve according to claim 1, characterized in that, The valve core structure includes a connecting rod and a valve core; one end of the connecting rod is connected to the piston, and the other end of the connecting rod is detachably connected to the valve core.

3. The pneumatic shut-off valve according to claim 2, characterized in that, The outer wall of the valve core is provided with an inclined surface from bottom to top outward.

4. The pneumatic shut-off valve according to claim 1, characterized in that, The piston cylinder includes a cylinder barrel and a bottom cover; the bottom cover is detachably disposed on the cylinder barrel; the movable chamber is located between the cylinder barrel and the bottom cover, and a vent is provided at the connection between the cylinder barrel and the bottom cover for communicating with the second vent pipe; The piston is located between the first vent pipe and the vent.

5. The pneumatic shut-off valve according to claim 4, characterized in that, The bottom cover has a through guide hole, and the valve core structure moves through the guide hole.

6. The pneumatic shut-off valve according to claim 4, characterized in that, The cavity wall of the lower cavity is provided with an annular limiting protrusion extending from the bottom of the bottom cover.

7. The pneumatic shut-off valve according to claim 6, characterized in that, A first sealing sleeve is fitted between the outer wall of the cylinder and the cavity wall of the upper cavity, and the outer wall of the first sealing sleeve is interference-fitted with the inner wall of the upper cavity. A second sealing sleeve is fitted between the bottom of the bottom cover and the top surface of the annular limiting protrusion, and / or a second sealing sleeve is fitted between the outer wall of the bottom cover and the cavity wall of the upper cavity.

8. The pneumatic shut-off valve according to claim 1, characterized in that, A third sealing sleeve is fitted between the outer wall of the piston and the wall of the movable cavity.

9. The pneumatic shut-off valve according to claim 1, characterized in that, Multiple pneumatic shut-off valves are provided, and adjacent pneumatic shut-off valves can be detachably connected. The adjacent liquid outlet channels are interconnected.

10. The pneumatic shut-off valve according to claim 9, characterized in that, Each of the pneumatic shut-off valves has a through locking hole, and adjacent locking holes are connected. The pneumatic shut-off valve also includes a locking element, which is inserted into each of the locking holes.

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