Axial-flow type gas cut-off valve reliable in transmission

Abstract

The utility model belongs to the technical field of gas cut-off valves, and particularly relates to a reliable-transmission axial-flow type gas cut-off valve which comprises a valve body, a first rectangular frame is fixedly connected to the outer wall of the top of the valve body through screws, and a transmission chamber is fixedly connected to the outer wall of the top of the first rectangular frame through screws. An air cylinder is fixedly connected to the outer wall of one side of the transmission chamber through screws, and a piston rod of the air cylinder is fixedly connected with a square block. The air cylinder is adopted to drive the square block and is matched with a double-connecting-rod transmission structure between the square block and the connecting sleeve, compared with a traditional single transmission mode, power transmission is more stable, the problems of transmission clamping stagnation and looseness are effectively avoided, the reliability of valve opening and closing is improved, the limiting bolt can accurately limit the moving stroke of the square block, and the valve opening and closing reliability is improved. And the angle sensor monitors the rotation angle of the transmission shaft in real time, then the opening and closing state of the ball valve is fed back, data are transmitted to the controller, and workers can conveniently and remotely monitor the operation condition of the valve.

Description

Technical Field

[0001] This utility model relates to the field of gas shut-off valve technology, and in particular to an axial flow gas shut-off valve with reliable transmission. Background Technology

[0002] Axial flow gas shut-off valves are control devices used in gas transmission pipeline systems. They utilize an axial flow structure to quickly cut off or allow gas flow, and are widely used in petrochemical, natural gas transmission, and metallurgical industries. Their core function is to quickly close the valve and block gas transmission in emergencies such as abnormal pressure or leakage, ensuring production safety. Under normal operating conditions, they can precisely regulate gas flow to meet production process requirements. Due to their low flow resistance and fast response speed, these valves have become key control components in gas transmission systems.

[0003] However, existing axial flow gas shut-off valves have some shortcomings in practical use:

[0004] First, the transmission structure design is unreasonable, often using a single connecting rod or gear transmission, which is prone to jamming and loosening during transmission, resulting in valve opening and closing not being smooth and affecting the reliability of cutting off or conducting. In addition, the lack of effective limit and positioning mechanisms makes it impossible to accurately control the movement stroke of the cylinder, which in turn affects the rotation angle of the valve stem, leading to poor sealing of the ball valve and the risk of gas leakage.

[0005] In addition, the lack of components for real-time monitoring of valve status makes it impossible to obtain ball valve opening and closing position information in a timely manner, which is inconvenient for remote monitoring and troubleshooting, and reduces the safety and intelligence of equipment operation. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a reliable axial flow gas shut-off valve, overcoming the deficiencies of existing technologies and effectively solving the problems of unreliable transmission structure, inaccurate limit positioning, and lack of status monitoring function in existing axial flow gas shut-off valves.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A reliable axial flow gas shut-off valve includes a valve body. A first rectangular frame is fixedly connected to the top outer wall of the valve body by screws. A transmission chamber is fixedly connected to the top outer wall of the first rectangular frame by screws. A cylinder is fixedly connected to one outer wall of the transmission chamber by screws, and a block is fixedly connected to the piston rod of the cylinder. A limit bolt is screwed to the other outer wall of the transmission chamber. Connecting rods are rotatably connected to the top and bottom outer walls of the block, and a connecting sleeve is hinged between the two connecting rods. A valve stem is installed through the inner wall of the connecting sleeve, and the top outer wall of the valve stem is inserted into it.

[0009] Preferably, the block is located inside the transmission chamber, and one end of the limiting bolt is attached to the outer wall of the block.

[0010] Preferably, a ball valve is installed on the outer wall of the bottom of the valve stem, and the ball valve is located inside the valve body.

[0011] Preferably, a feed valve cover and a discharge valve cover are welded to the outer walls on both sides of the valve body, and a sealing ring is provided on the inner wall of one end of the feed valve cover and the discharge valve cover, and the sealing ring is interference fit with the ball valve.

[0012] Preferably, the valve stem has a positioning hole on its top outer wall, and the drive shaft is inserted into the inner wall of the positioning hole.

[0013] Preferably, a second rectangular frame is fixedly connected to the top outer wall of the transmission chamber by screws, and a controller is installed on the top outer wall of the second rectangular frame.

[0014] Preferably, the angle sensor is mounted on the bottom outer wall of the controller, and the angle sensor is also disposed through the top inner wall of the second rectangular frame.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The axial flow gas shut-off valve designed in this way has reliable transmission. It adopts a cylinder-driven block and a double-link transmission structure between the block and the connecting sleeve. Compared with the traditional single transmission method, the power transmission is more stable, effectively avoiding transmission jamming and loosening problems, improving the reliability of valve opening and closing. In addition, the limit bolt can precisely limit the movement stroke of the block, thereby controlling the rotation angle of the valve stem and ensuring that the ball valve can be fully closed or opened. With the sealing rings in the feed valve cover and discharge valve cover interfering with the ball valve, the sealing performance is greatly improved and the risk of gas leakage is eliminated.

[0017] 2. The axial flow gas shut-off valve designed here has reliable transmission. The valve stem and transmission shaft are precisely connected through the positioning hole, which is stable and firm and avoids separation or slippage during long-term use, thus ensuring power transmission efficiency. In addition, the angle sensor monitors the rotation angle of the transmission shaft in real time, and then feeds back the opening and closing status of the ball valve. The data is transmitted to the controller, which makes it easy for the staff to remotely monitor the operation of the valve, detect faults in time and deal with them in a timely manner, thereby improving the safety and intelligence of the equipment operation. Attached Figure Description

[0018] Figure 1 A three-dimensional schematic diagram of the overall structure of a reliable axial flow gas shut-off valve proposed in this utility model. Figure 1 ;

[0019] Figure 2A three-dimensional schematic diagram of the overall structure of a reliable axial flow gas shut-off valve proposed in this utility model. Figure 2 ;

[0020] Figure 3 for Figure 2 Enlarged schematic diagram of part A of the structure;

[0021] Figure 4 This is a schematic diagram showing the disassembled structure of the valve stem and drive shaft of an axial flow gas shut-off valve with reliable transmission proposed in this utility model.

[0022] Figure 5 This is a cross-sectional view of the overall structure of an axial flow gas shut-off valve with reliable transmission proposed in this utility model;

[0023] Figure 6 for Figure 5 An enlarged schematic diagram of part B of the structure.

[0024] In the diagram: 1. Valve body; 2. First rectangular frame; 3. Transmission chamber; 4. Cylinder; 5. Block; 6. Limit bolt; 7. Connecting rod; 8. Connecting sleeve; 9. Valve stem; 10. Transmission shaft; 11. Angle sensor; 12. Ball valve; 13. Feed valve cover; 14. Discharge valve cover; 15. Sealing ring; 16. Positioning hole; 17. Second rectangular frame; 18. Controller. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figures 1-6 Example 1: A reliable axial flow gas shut-off valve includes a valve body 1. A first rectangular frame 2 is fixedly connected to the top outer wall of the valve body 1 by screws. A transmission chamber 3 is fixedly connected to the top outer wall of the first rectangular frame 2 by screws. A cylinder 4 is fixedly connected to one side outer wall of the transmission chamber 3 by screws. A block 5 is fixedly connected to the piston rod of the cylinder 4. A limit bolt 6 is screwed to the other side outer wall of the transmission chamber 3. The block 5 is located inside the transmission chamber 3, and one end of the limit bolt 6 is attached to the outer wall of the block 5.

[0027] Through the above scheme, the valve body 1 is made of cast steel, which has high strength and corrosion resistance, providing a stable installation foundation for internal components. The first rectangular frame 2 is fixed to the top of the valve body 1 with screws to support the transmission chamber 3, ensuring that there is adequate installation and operating space between the transmission chamber 3 and the valve body 1. The transmission chamber 3 is a closed cavity structure to prevent dust and impurities from entering and affecting the operation of the transmission components. The cylinder 4 is a standard cylinder 4 of model SC63×200, which is pneumatically driven. The piston rod extends and retracts to drive the block 5 to move horizontally inside the transmission chamber 3. The limit bolt 6 is a high-strength bolt of model M16×50, which is screwed to the outer wall of the other side of the transmission chamber 3. The extension length can be adjusted by rotation to precisely limit the movement stroke of the block 5 and ensure transmission accuracy.

[0028] In the second embodiment, the top and bottom outer walls of the block 5 are rotatably connected with connecting rods 7, and a connecting sleeve 8 is hinged between the two connecting rods 7. A valve stem 9 is installed through the inner wall of the connecting sleeve 8, and the top outer wall of the valve stem 9 is inserted into it. A positioning hole 16 is opened on the top outer wall of the valve stem 9, and the transmission shaft 10 is inserted into the inner wall of the positioning hole 16.

[0029] Through the above scheme, the top and bottom of block 5 are rotatably connected to connecting rod 7 via pins. The two connecting rods 7 are symmetrically distributed, forming a parallelogram transmission mechanism, enabling the connecting sleeve 8 to rotate smoothly horizontally. The valve stem 9 is made of alloy structural steel with a chrome-plated surface to improve wear resistance and corrosion resistance. Its bottom is fixed to the ball valve 12 via a key connection. The positioning hole 16 is located at the center of the top of the valve stem 9, and its size matches the bottom structure of the transmission shaft 10. The transmission shaft 10 is connected to the positioning hole 16 via a plug-in connection, realizing synchronous rotation of the valve stem 9 and the transmission shaft 10 and avoiding relative slippage.

[0030] A ball valve 12 is installed on the bottom outer wall of the valve stem 9, and the ball valve 12 is located inside the valve body 1. The feed valve cover 13 and the discharge valve cover 14 are welded to the outer walls on both sides of the valve body 1, and a sealing ring 15 is provided on the inner wall of one end of the feed valve cover 13 and the discharge valve cover 14. The sealing ring 15 is interference-fitted with the ball valve 12.

[0031] Through the above-described design, the ball valve 12 is made of stainless steel, and the surface of the ball is precision ground to ensure sealing performance. The inlet valve cover 13 and the outlet valve cover 14 are both welded to the valve body 1, and their materials are the same as those of the valve body 1. Their internal channel diameter matches the flow port diameter of the ball valve 12 to ensure smooth gas flow. The sealing ring 15 is made of fluororubber, which has high temperature resistance, high pressure resistance, and corrosion resistance. Its interference fit with the sealing surface of the ball valve 12 is 0.5mm. When the ball valve 12 is closed, the sealing ring 15 is compressed and deformed, achieving a reliable seal and preventing gas leakage.

[0032] The top outer wall of the transmission chamber 3 is fixedly connected to a second rectangular frame 17 by screws, and a controller 18 is installed on the top outer wall of the second rectangular frame 17. An angle sensor 11 is installed on the bottom outer wall of the controller 18, and the angle sensor 11 is installed through the top inner wall of the second rectangular frame 17.

[0033] In the above scheme, the second rectangular frame 17 is fixed to the top of the transmission chamber 3 with screws to support the controller 18 and the angle sensor 11. The controller 18 is a programmable controller of model S7-1200, which operates by receiving, processing, and sending commands. It can interact with the control elements of the angle sensor 11 and the cylinder 4 and has remote communication capabilities. The angle sensor 11 is a precision angle sensor of model WDD35D4, with a measurement range of 0-360° and an accuracy of ±0.1°. It is installed through the top inner wall of the second rectangular frame 17, with its detection end in contact with the top of the transmission shaft 10, monitoring the rotation angle of the transmission shaft 10 in real time, and converting the data into an electrical signal for transmission to the controller 18.

[0034] Working principle: Under normal operating conditions, gas enters the valve body 1 through the feed valve cover 13, flows through the ball valve 12, and is output from the discharge valve cover 14. When the valve needs to be closed, the controller 18 sends a command to the cylinder 4. Under the drive of air pressure, the piston rod of the cylinder 4 retracts, causing the block 5 to move closer to the limit bolt 6. The connecting rods 7 at the top and bottom of the block 5 rotate synchronously, pushing the connecting sleeve 8 to rotate horizontally, which in turn drives the valve stem 9 to rotate. The ball valve 12 at the bottom of the valve stem 9 then rotates to the closed position. At this time, the ball valve 12 is press-fitted with the sealing ring 15 in the feed valve cover 13 and the discharge valve cover 14 to achieve a seal and cut off the gas flow. The limit bolt 6 limits the maximum movement distance of the block 5 to ensure that the ball valve 12 is completely closed.

[0035] When the valve needs to be opened, the controller 18 sends a reverse command, the piston rod of cylinder 4 extends, driving block 5 to move in the opposite direction. Connecting rod 7 pulls connecting sleeve 8 to rotate, valve stem 9 rotates in the opposite direction, ball valve 12 opens, and gas flow resumes. During the rotation of valve stem 9, drive shaft 10 rotates synchronously with valve stem 9 through positioning hole 16. Angle sensor 11 monitors the rotation angle of drive shaft 10 in real time and transmits the data to controller 18. Controller 18 determines the opening and closing status of ball valve 12 based on the angle data. If an abnormality occurs, controller 18 can automatically send a command to close the valve and issue an alarm signal to ensure safe system operation.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A reliable axial flow gas shut-off valve, comprising a valve body (1), characterized in that, The valve body (1) has a first rectangular frame (2) fixedly connected to the top outer wall by screws, and a transmission chamber (3) is fixedly connected to the top outer wall of the first rectangular frame (2) by screws. A cylinder (4) is fixedly connected to one side outer wall of the transmission chamber (3) by screws, and a block (5) is fixedly connected to the piston rod of the cylinder (4). A limit bolt (6) is screwed to the other side outer wall of the transmission chamber (3). A connecting rod (7) is rotatably connected to the top and bottom outer walls of the block (5), and a connecting sleeve (8) is hinged between the two connecting rods (7). A valve stem (9) is installed through the inner wall of the connecting sleeve (8), and a transmission shaft (10) is inserted into the top outer wall of the valve stem (9). An angle sensor (11) is installed on the top outer wall of the transmission shaft (10).

2. The axial flow gas shut-off valve with reliable transmission according to claim 1, characterized in that, The block (5) is located inside the transmission chamber (3), and one end of the limiting bolt (6) is attached to the outer wall of the block (5).

3. The axial flow gas shut-off valve with reliable transmission according to claim 1, characterized in that, A ball valve (12) is installed on the bottom outer wall of the valve stem (9), and the ball valve (12) is located inside the valve body (1).

4. The reliable axial flow gas shut-off valve according to claim 1, characterized in that, The valve body (1) has a feed valve cover (13) and a discharge valve cover (14) welded to the outer walls on both sides respectively. A sealing ring (15) is provided on the inner wall of one end of the feed valve cover (13) and the discharge valve cover (14). The sealing ring (15) is interference-fitted with the ball valve (12).

5. A reliable axial flow gas shut-off valve according to claim 1, characterized in that, The valve stem (9) has a positioning hole (16) on its top outer wall, and the drive shaft (10) is inserted into the inner wall of the positioning hole (16).

6. The axial flow gas shut-off valve with reliable transmission according to claim 1, characterized in that, The top outer wall of the transmission chamber (3) is fixedly connected to a second rectangular frame (17) by screws, and a controller (18) is installed on the top outer wall of the second rectangular frame (17).

7. The axial flow gas shut-off valve with reliable transmission according to claim 1, characterized in that, The angle sensor (11) is installed on the bottom outer wall of the controller (18), and the angle sensor (11) is installed through the top inner wall of the second rectangular frame (17).

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