An upper air-tight valve with a leakage detection function

Abstract

The application relates to an upper air-tight valve with a leakage detection function, and belongs to the technical field of valves.The valve plate is arranged in a shell and is in sliding connection with the shell;the nut sleeve is connected with the valve plate;the lead screw is in threaded connection with the nut sleeve;the driving component is connected with the lead screw and is used for driving the lead screw to rotate;the cam component is in abutment with the valve plate and is used for tightly pressing the valve plate to seal; and the leakage detection part is arranged on the shell and is used for detecting gas leakage.The application combines the main sealing of the valve plate-sealing strip and the auxiliary compression sealing of the cam component to form a double-sealing mechanism.When the valve plate is driven by the driving component to the closed position, the cam component can further act to apply an additional mechanical compression force to the valve plate, greatly enhancing the specific pressure between the sealing pairs, effectively compensating for the sealing force drop caused by the wear of the sealing strip or the slight deformation of the valve body, so that the valve can still maintain high air tightness in long-term use.

Description

Technical Field

[0001] This application belongs to the field of valve technology, specifically relating to an airtight valve with leakage detection function. Background Technology

[0002] In industries such as grain storage, chemicals, and environmental protection, steel silos are commonly used for sealed fumigation of materials to kill pests or facilitate process reactions. During this process, the silo is filled with toxic and flammable fumigation gases such as phosphine. The upper and lower airtight valves are key equipment in the fumigation system; their core function is to completely disconnect the steel silo from external pipelines during fumigation operations, creating a sealed space to prevent the leakage of toxic gases and ensure operational and environmental safety.

[0003] Currently, most airtight valves on the market are in the form of gate valves or butterfly valves, and are driven by screw, cylinder, or electric actuators. Although these valves have basic shut-off functions, they suffer from insufficient sealing reliability in practical applications. After long-term use, the sealing material is prone to wear and aging, or the valve body may deform, leading to poor sealing. Minor leaks are difficult to detect during routine inspections, but they can continuously cause the release of toxic gases, posing a significant safety hazard.

[0004] Therefore, there is an urgent need in the field for an airtight valve with more reliable sealing performance and integrated intuitive and visual leak detection function to overcome the shortcomings of the prior art. Summary of the Invention

[0005] To solve the above problems, the technical solution adopted in this application is: An airtight valve with leakage detection function includes: The outer shell serves a supporting function; A valve plate, wherein the valve plate is disposed inside the housing and is slidably connected to the housing; Nut sleeve, connected to valve plate; Lead screw, wherein the lead screw is threadedly connected to the nut; The drive component, connected to the lead screw, is used to drive the lead screw to rotate; The cam component abuts against the valve plate to tighten and seal the valve plate. A leak detection unit, mounted on the housing, is used to detect gas leaks.

[0006] Furthermore, a sliding groove is provided on the outer casing, the valve plate is slidably connected to the sliding groove, a support strip is provided inside the outer casing, a sealing strip is provided on the support strip, and the sealing strip abuts against the valve plate.

[0007] Furthermore, the drive component includes a handwheel and an electric actuator, the electric actuator being connected to one end of the lead screw via a coupling, and the handwheel being connected to the other end of the lead screw via a coupling.

[0008] Furthermore, the electric actuator includes a motor and a speed reducer.

[0009] Furthermore, the valve plate is provided with a first limit switch and a second limit switch. The first limit switch and the second limit switch are electrically connected to the electric actuator. The first limit switch is used to limit the closed position of the valve plate, and the second limit switch is used to limit the open position of the valve plate.

[0010] Furthermore, the leak detection unit includes a three-way pipe, an observation window, and a colorimetric card. The three-way pipe is located on the outlet side of the outer casing, the observation window is installed on the bypass interface of the three-way pipe and forms a detection chamber, and the colorimetric card is located at the observation window. The colorimetric card is equipped with a chemical colorimetric reagent that is sensitive to the target gas.

[0011] Furthermore, the cam component includes a cam, a camshaft, a motor, and a position switch. The cam is disposed at the end of the camshaft, and the farthest end of the cam abuts against the valve plate. The camshaft is connected to the housing bearing. The output shaft of the motor is connected to the camshaft. The position switch is electrically connected to the motor.

[0012] Furthermore, the cams are in two sets, respectively located at both ends of the valve plate.

[0013] Compared with the prior art, the beneficial effects of this application are as follows: 1. This application provides an airtight valve with leakage detection function. This application combines the main seal of "valve plate-sealing strip" with the auxiliary compression seal of "cam element" to form a dual sealing mechanism. When the valve plate is driven to the closed position by the drive component, the cam element can further actuate to apply an additional mechanical clamping force to the valve plate, which greatly enhances the specific pressure between the sealing pairs and effectively compensates for the decrease in sealing force caused by seal strip wear or slight deformation of the valve body, thereby ensuring that the valve can maintain extremely high airtightness during long-term use.

[0014] 2. This application provides an airtight valve with leakage detection function, which integrates a leakage detection unit based on chemical colorimetry. This design, by setting a three-way detection chamber with an observation window and chemical colorimetric reagent on the valve outlet side, converts invisible gas leaks into visible color changes. Operators do not need expensive instruments; they only need to periodically inspect and observe the valve, comparing the results with a colorimetric card, to quickly and qualitatively determine the leakage status.

[0015] 3. This application provides an airtight valve with leakage detection function, which adopts a redundant design with both manual and electric dual drive. The electric actuator meets the needs of automated remote control and improves operation efficiency; while the handwheel provides reliable operation guarantee in case of power failure or emergency, ensuring system safety. Attached Figure Description

[0016] Figure 1 This is a front view of the device described in this application; Figure 2 This is a diagram of the internal structure of the device in this application; Figure 3 This is a top view of the device described in this application.

[0017] In the diagram: 1. Outer shell, 10. Slide groove, 11. Support bar, 12. Sealing bar, 2. Valve plate, 21. First limit switch, 22. Second limit switch, 3. Nut sleeve, 4. Lead screw, 5. Drive component, 51. Handwheel, 52. Electric actuator, 6. Cam component, 61. Cam, 62. Camshaft, 63. Motor, 64. Position switch, 7. Leakage detection unit, 71. T-pipe, 72. Observation window, 73. Color card. Detailed Implementation

[0018] The present application will be further described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present application.

[0019] Example 1: like Figures 1 to 3 As shown, this application provides an airtight valve with leakage detection function, mainly used in steel silo fumigation systems in industries such as grain storage and chemical processing. It ensures that toxic gases do not leak when the valve is closed and has an intuitive and simple leakage detection function. This embodiment of the airtight valve with leakage detection function mainly includes a housing 1, a valve plate 2, a nut sleeve 3, a lead screw 4, a drive component 5, a cam component 6, and a leakage detection unit 7.

[0020] The outer casing 1 constitutes the main flow channel of the valve, and its inner side walls are provided with sliding grooves 10. The valve plate 2 is inserted into the sliding groove 10 and slidably connected to the sliding groove 10, allowing the valve plate 2 to move up and down along the sliding groove 10 to open and close the valve. A support strip 11 is also fixedly installed in the internal channel of the outer casing 1, and a sealing strip 12 is embedded in the support strip 11. When the valve plate 2 slides to the closed position, its edge tightly abuts against the sealing strip 12, forming the first seal. Specifically, the support strip 11 is made of hot-pressed steel plate and is used to support the sealing strip 12. The sealing strip 12 is made of rubber and can be embedded in the support strip 11; when the valve plate 2 slides, it is sealed by the sealing strip 12.

[0021] The nut sleeve 3 is fixedly connected to one side of the valve plate 2. The lead screw 4 passes through the nut sleeve 3 and forms a threaded pair with it. The drive component 5 is used to drive the lead screw 4 to rotate, thereby driving the valve plate 2 to move linearly through the nut sleeve 3. In this embodiment, the drive component 5 includes an electric actuator 52 and a handwheel 51. The electric actuator 52 specifically includes a motor and a reducer, and its output shaft is connected to the upper end of the lead screw 4 through a coupling to realize electric drive. The handwheel 51 is connected to the lower end of the lead screw 4 through another coupling so as to be manually operated in case of power failure or maintenance.

[0022] To precisely control the stroke of valve plate 2, a first limit switch 21 and a second limit switch 22 are installed on valve plate 2. The first limit switch 21 is used to limit the closed position of valve plate. When valve plate 2 moves to the fully closed position and contacts sealing strip 12, the first limit switch 21 is triggered, sending a signal to electric actuator 52 to stop its operation. The second limit switch 22 is used to limit the opening position of valve plate. When valve plate 2 opens to the preset maximum opening degree, the second limit switch 22 is triggered, similarly stopping electric actuator 52 to prevent over-opening.

[0023] To further ensure the sealing reliability of the valve in the closed state, a cam component 6 is also provided. The cam component 6 includes a cam 61, a camshaft 62, a motor 63, and a position switch 64. The camshaft 62 is mounted on the housing 1 via a bearing seat, and the cam 61 is fixedly mounted at its end. The output shaft of the motor 63 is connected to the camshaft 62 to drive its rotation. When the valve plate 2 is driven to the closed position by the lead screw, the motor 63 starts, driving the camshaft 62 to rotate, causing the farthest end of the cam 61 to rotate and press against the leeward side of the valve plate 2, thereby applying an additional clamping force to the valve plate 2, making the seal between it and the sealing strip 12 more reliable. The position switch 64 is used to detect the rotational position of the cam 61. When the cam 61 rotates to the clamping position or the loosening position, the position switch 64 is triggered, controlling the motor 63 to stop operating. As a preferred embodiment, the cam 61 can be configured in two sets, corresponding to the upper and lower ends of the valve plate 2 respectively for clamping, thereby making the sealing force more uniform and the sealing effect better. Specifically, the position switch 64 is a Hall switch or other similar detection switch mechanism used to detect the position of the cam 61.

[0024] One of the core improvements of this application is the inclusion of a leak detection unit 7. This leak detection unit 7 is installed on the outlet side of the housing 1 and is used to monitor the valve for leaks in real time during fumigation. The leak detection unit 7 includes a three-way pipe 71, an observation window 72, and a colorimetric card 73. The three-way pipe 71 is connected in series to the valve's outlet pipe. The observation window 72, typically made of a high-strength transparent material such as tempered glass, is installed on the bypass port of the three-way pipe 71, thus forming a sealed detection chamber together with the three-way pipe. This detection chamber is filled with a chemical colorimetric reagent sensitive to the target toxic gas (such as phosphine) (e.g., silica gel particles impregnated with silver nitrate or mercuric bromide). The colorimetric card 73 is fixedly installed next to the observation window 72. The colorimetric card 73 is printed with standard color levels corresponding to the color changes of the chemical colorimetric reagent at different gas concentrations (e.g., from white for safety, to light yellow for minor leaks, and dark brown for severe leaks).

[0025] Work process: When the valve needs to be closed, the drive component 5 operates, driving the lead screw 4 to rotate and moving the valve plate 2 downwards until its edge presses against the sealing strip 12, and the first limit switch 21 confirms that it is fully closed. Subsequently, the motor 63 of the cam component 6 starts, driving the cam 61 to rotate and press it against the back of the valve plate, forming a double seal. During fumigation, the operator can periodically observe the color of the chemical colorimetric reagent in the detection chamber through the observation window 72 and compare it with the colorimetric card 73. If the color does not change, it indicates that the valve is well sealed and there is no leakage; if the color turns yellow or brown, it indicates that toxic gas has passed through the main seal of the valve, causing a leak, and immediate measures need to be taken. The entire detection process requires no electricity, is intuitive and reliable, and provides great convenience for on-site safety inspections.

[0026] Of course, the above embodiments are not intended to limit this application, and this application is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this application should also fall within the protection scope of this application.

Claims

1. An airtight valve with leakage detection function, characterized in that: include: The outer shell (1) serves as a support; Valve plate (2), the valve plate (2) is disposed inside the outer shell (1), and the valve plate (2) is slidably connected to the outer shell (1); Nut sleeve (3) is connected to valve plate (2); Lead screw (4), which is threadedly connected to nut sleeve (3); The drive component (5) is connected to the lead screw (4) and is used to drive the lead screw (4) to rotate; The cam (6) abuts against the valve plate (2) to tighten the valve plate (2) for sealing; A leak detection unit (7) is installed on the housing (1) for detecting gas leaks.

2. The airtight valve with leakage detection function according to claim 1, characterized in that: The outer shell (1) is provided with a sliding groove (10), the valve plate (2) is slidably connected to the sliding groove (10), the outer shell (1) is provided with a support strip (11), the support strip (11) is provided with a sealing strip (12), and the sealing strip (12) abuts against the valve plate (2).

3. The airtight valve with leakage detection function according to claim 1, characterized in that: The drive component (5) includes a handwheel (51) and an electric actuator (52). The electric actuator (52) is connected to one end of the lead screw (4) via a coupling, and the handwheel (51) is connected to the other end of the lead screw (4) via a coupling.

4. The airtight valve with leakage detection function according to claim 3, characterized in that: The electric actuator (52) includes a motor and a speed reducer.

5. The airtight valve with leakage detection function according to claim 1, characterized in that: The valve plate (2) is provided with a first limit switch (21) and a second limit switch (22). The first limit switch (21) and the second limit switch (22) are electrically connected to the electric actuator (52). The first limit switch (21) is used to limit the closed position of the valve plate (2), and the second limit switch (22) is used to limit the open position of the valve plate (2).

6. The airtight valve with leakage detection function according to claim 1, characterized in that: The leak detection unit (7) includes a three-way pipe (71), an observation window (72), and a colorimetric card (73). The three-way pipe (71) is located on the outlet side of the outer casing (1). The observation window (72) is installed on the bypass interface of the three-way pipe (71) and forms a detection chamber. The colorimetric card (73) is located at the observation window (72) and is provided with a chemical colorimetric reagent that is sensitive to the target gas.

7. The airtight valve with leakage detection function according to claim 1, characterized in that: The cam component (6) includes a cam (61), a camshaft (62), a motor (63), and a position switch (64). The cam (61) is located at the end of the camshaft (62), and the farthest end of the cam (61) abuts against the valve plate (2). The camshaft (62) is connected to the housing (1) bearing. The output shaft of the motor (63) is connected to the camshaft (62). The position switch (64) is electrically connected to the motor (63).

8. The airtight valve with leakage detection function according to claim 7, characterized in that: The cams (61) are in two sets, respectively located at both ends of the valve plate (2).

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