Gas safety shut-off valve

Abstract

The utility model discloses a gas safety cut-off valve which comprises a valve body, one end of the valve body is provided with a gas inlet, the other end of the valve body is provided with a gas outlet, a cut-off piece is arranged in the gas outlet, and the cut-off piece comprises a cut-off pipe, a cut-off block and a reset spring. The cut-off block is located at the inner end of the cut-off pipe and can cut off the through hole of the cut-off pipe, and the reset spring drives the cut-off block to be away from the cut-off pipe. The stop valve has the effect of improving the safety of the stop valve.

Description

Technical Field

[0001] The present application relates to the technical field of shut-off valves, and in particular to a gas safety shut-off valve. Background Art

[0002] The core of high-pressure gas transmission safety is the stability of the transmission gas pressure. This is to ensure that during the gas transmission process, gas safety accidents caused by excessively high or low pressure in the pipeline are avoided. Currently, electronic monitoring of pipeline pressure is usually used to drive the gas shut-off mechanism to cut off the gas. The gas shut-off valve on the market detects changes in pressure. When the gas pressure in the valve body exceeds or falls below the normal value, the electronic monitoring will cut off the connecting hole in the valve body through the gas shut-off mechanism. However, when the connecting hose is separated from the gas outlet of the valve body, the gas will leak out from the gas outlet of the valve body, which will cause serious safety accidents. Utility Model Content

[0003] The purpose of the utility model is to provide a gas safety shut-off valve in view of the defects and shortcomings of the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] It includes a valve body, one end of which has an air inlet, the other end of which has an air outlet, a shutoff piece is provided in the air outlet, the shutoff piece includes a shutoff tube, a shutoff block and a return spring, the shutoff block is located at the inner end of the shutoff tube and can shut off the through hole of the shutoff tube, and the return spring drives the shutoff block away from the shutoff tube.

[0006] Preferably, a fixing frame is provided at the inner end of the cut-off tube, and a sliding rod is provided at the end of the cut-off block away from the cut-off tube. The sliding rod is inserted and slid in the fixing frame, and a limiting block is provided at the other end of the sliding rod. The return spring is sleeved on the circumference of the sliding rod, one end of the return spring abuts against one side of the limiting block, and the other end of the return spring abuts against one side of the fixing frame.

[0007] Preferably, a mounting sleeve is fixedly installed on the inner circumference of the air outlet, and the cut-off pipe is threadably connected to the mounting sleeve.

[0008] Preferably, a fixing ring is circumferentially provided on the inner circumference of the air outlet, the inner end of the mounting sleeve abuts against one side of the fixing ring, a spring clip is placed on the outer end of the mounting sleeve, and the spring clip is embedded and fixed on the inner wall of the air outlet.

[0009] Preferably, the inner side wall of the air outlet has a pressure sensing device.

[0010] Preferably, the pressure sensing device includes a pressure sensor, a driving rod, a compression spring and an installation box, one end of the driving rod is inserted and slid into the side wall of the installation box, the pressure sensor is located in the installation box, the inner end of the driving rod corresponds to the pressure sensor, and the compression spring is sleeved on the circumference of the driving rod, and the compression spring drives the driving rod away from the installation box.

[0011] Preferably, a sealing ring is provided between the mounting sleeve and the fixing ring.

[0012] In summary, this application includes at least one of the following beneficial technical effects:

[0013] When the cam is in the closed position, the spring will push the block away from the cut-off tube and the gas will flow into the hose. When the cam is in the closed position, the gas will flow out of the hose and the gas outlet will be prevented from flowing out.

[0014] 2. When the valve body is working, when the pressure of the gas in the valve body is too high, it will push the drive rod and squeeze the compression spring, so that the inner end of the drive rod contacts the pressure sensor, and the pressure sensor will command the control motor to start through the circuit board, thereby closing the valve and sealing the valve body, thereby improving the stability of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of the cut-off valve of the utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 It is an exploded schematic diagram of the truncation piece of the utility model.

[0018] In the figure: 1. Valve body; 2. Valve seat; 3. Valve cover; 4. Motor; 5. Reduction gear set; 6. Screw; 7. Sealing cover; 8. Air inlet; 9. Air outlet; 10. Step groove; 11. Fixing ring; 12. Mounting sleeve; 13. Spring clip; 14. Ring groove; 15. Cut-off piece; 16. Cut-off tube; 17. Cut-off block; 18. Return spring; 19. Bracket; 20. Disc; 21. Sliding rod; 22. Limit block; 23. Sealing ring; 24. First groove; 25. Second groove; 26. Third groove; 27. Pressure sensing device; 28. Pressure sensor; 29. ​​Drive rod; 30. Compression spring; 31. Mounting box; 32. Protective cover; 33. Fixing bracket. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] The embodiment of the present application discloses a gas safety shut-off valve.

[0021] Reference Figure 1 , including a valve body 1, a valve seat 2, a valve cover 3, a motor 4, a reduction gear set 5, a screw 6 and a sealing cover 7. The valve body 1 is fixedly connected to the valve seat 2 through the valve cover 3. The motor 4 and the reduction gear set 5 are correspondingly installed in the valve seat 2. The top end of the screw 6 is transmission connected to the sealing cover 7. The bottom end of the screw 6 passes through the valve cover 3 and is transmission connected to the reduction gear set 5. The sealing cover 7 can cover and seal the valve port of the valve body 1 under the push of the screw 6. One end of the valve body 1 has an air inlet 8, and the other end of the valve body 1 has an air outlet 9.

[0022] A stepped groove 10 is provided on the inner circumference of the outer end of the air outlet 9. The bottom end of the stepped groove 10 is a fixed ring 11. A mounting sleeve 12 is inserted and fixed in the stepped groove 10. One end of the mounting sleeve 12 abuts against one side of the fixed ring 11. A spring clip 13 is placed on the outer end of the mounting sleeve 12. The valve body 1 is provided with a ring groove 14 on the circumferential side wall of the stepped groove 10 for the spring clip 13 to be embedded.

[0023] Reference Figure 1 and Figure 3A truncation piece 15 is placed in the mounting sleeve 12. The truncation piece 15 includes a truncation tube 16, a truncation block 17, and a reset spring 18. The inner end of the truncation tube 16 is threaded and rotatably connected to the inner circumference of the mounting sleeve 12. The inner end of the truncation tube 16 is integrally provided with a fixing bracket 33. The fixing bracket 33 includes four brackets 19 and a disc 20. One end of the four brackets 19 is uniformly and integrally provided on the inner end of the truncation tube 16 in the circumferential direction. The bracket 19 is "L"-shaped. The other end of the four brackets 19 is uniformly and integrally provided on the circumferential side of the disc 20. The truncation block 17 is located between the four brackets 19 and between the disc 20 and the truncation tube 16. A through-hole is provided through the side wall of the disc 20. A sliding rod 21 is integrally provided on one side of the truncation block 17. The sliding rod 21 is inserted and slidably inserted into the through-hole. The sliding rod 21 is fixed to the limiting block 22 by a bolt at the end away from the truncation block 17. The return spring 18 is sleeved on the circumferential side of the sliding rod 21. One end of the return spring 18 abuts against one side of the disc 20, and the other end of the return spring 18 abuts against one side of the limiting block 22.

[0024] Place one end of the mounting sleeve 12 against one side of the fixing ring 11, then place one side of the spring clip 13 against the outer end of the mounting sleeve 12 and clip it to the inner circumference of the gas outlet 9, then the hose can be installed and fixed to the outer end of the gas outlet 9. When the valve body 1 is working, the flow rate of the gas outlet 9 of the valve body 1 is small, and the return spring 18 will pull the cut-off block 17 away from the cut-off tube 16 through the sliding rod 21, so that the gas will enter the hose through the cut-off tube 16. When the hose and the gas outlet of the valve body 1 are in contact, the gas will enter the hose. After the port 9 is disconnected, the flow rate of the gas at the gas outlet 9 of the valve body 1 increases, so that the force acting on the cut-off block 17 is greater than the elastic force of the return spring 18, causing the cut-off block 17 to approach the cut-off tube 16. During this process, the amount of gas flowing out of the cut-off tube 16 becomes smaller and smaller, and the force acting on the cut-off block 17 becomes larger and larger, until the cut-off block 17 completely closes the cut-off tube 16, so that the gas in the valve body 1 will not flow out from the gas outlet 9, preventing gas leakage from affecting the surrounding outside world.

[0025] A sealing ring 23 is placed between the mounting sleeve 12 and the fixing ring 11. The sealing ring 23 can improve the sealing between the mounting sleeve 12 and the fixing ring 11, and can prevent the gas from leaking out from between the mounting sleeve 12 and the gas outlet 9, thereby ensuring the flow rate in the gas outlet 9.

[0026] Reference Figure 2The valve body 1 is provided with a first groove 24 on the outside of the air outlet 9, and a second groove 25 is provided at the bottom of the first groove 24. The valve body 1 is provided with a third groove 26 at the bottom of the second groove 25. The first groove 24, the second groove 25 and the third groove 26 connect the inside of the air outlet 9 with the outside world. A pressure sensing device 27 is placed on the inner wall of the air outlet 9. The pressure sensing device 27 includes a pressure sensor 28, a driving rod 29, a compression spring 30 and an installation box 31. The vertical section of the driving rod 29 is in the shape of a "cross". The lower end of the driving rod 29 is inserted into the third groove 26, and the circular plate in the middle of the driving rod 29 Abutting the bottom of the second groove 25, the upper end of the drive rod 29 passes through the side wall of the mounting box 31 and is inserted into the mounting box 31. The pressure sensor 28 is mounted and fixed to the inner wall of the mounting box 31. The upper end of the drive rod 29 corresponds to the pressure sensor 28. A compression spring 30 is sleeved around the upper end of the drive rod 29. One end of the compression spring 30 abuts the circular plate in the middle of the drive rod 29, and the other end abuts the outer wall of the mounting box 31. The mounting box 31 is fixed to the first groove 24 by bolts. A protective cover 32 is fixed to the outer side of the valve body 1, sealing the pressure sensing device 27. When the gas pressure in the valve body 1 is too high, it pushes the drive rod 29 and compresses the compression spring 30, causing the inner end of the drive rod 29 to contact the pressure sensor 28. The pressure sensor 28 then commands the control motor 4 through the circuit board to start, thereby closing the valve.

[0027] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A gas safety shut-off valve, comprising a valve body (1), wherein one end of the valve body (1) has an air inlet (8), and the other end of the valve body (1) has an air outlet (9), characterized in that: A cutoff piece (15) is provided in the air outlet (9), and the cutoff piece (15) comprises a cutoff tube (16), a cutoff block (17) and a return spring (18). The cutoff block (17) is located at the inner end of the cutoff tube (16) and can cut off the through hole of the cutoff tube (16). The return spring (18) drives the cutoff block (17) away from the cutoff tube (16).

2. A gas safety shut-off valve according to claim 1, characterized in that: A fixing frame (33) is provided at the inner end of the cut-off tube (16), and a sliding rod (21) is provided at the end of the cut-off block (17) away from the cut-off tube (16). The sliding rod (21) is inserted and slidably arranged in the fixing frame (33), and a limiting block (22) is provided at the other end of the sliding rod (21). The return spring (18) is sleeved on the circumference of the sliding rod (21), and one end of the return spring (18) abuts against one side of the limiting block (22), and the other end of the return spring (18) abuts against one side of the fixing frame (33).

3. A gas safety shut-off valve according to claim 1, characterized in that: A mounting sleeve (12) is fixedly mounted on the inner circumference of the air outlet (9), and the cut-off tube (16) is threadably connected to the mounting sleeve (12).

4. A gas safety shut-off valve according to claim 3, characterized in that: A fixing ring (11) is circumferentially provided on the inner circumference of the air outlet (9), the inner end of the mounting sleeve (12) abuts against one side of the fixing ring (11), and a spring clip (13) is placed on the outer end of the mounting sleeve (12), and the spring clip (13) is embedded and fixed on the inner side wall of the air outlet (9).

5. A gas safety shut-off valve according to claim 1, characterized in that: The inner side wall of the air outlet (9) is provided with a pressure sensing device (27).

6. A gas safety shut-off valve according to claim 5, characterized in that: The pressure sensing device (27) includes a pressure sensor (28), a driving rod (29), a compression spring (30) and an installation box (31). One end of the driving rod (29) is inserted and slid into the side wall of the installation box (31). The pressure sensor (28) is located in the installation box (31). The inner end of the driving rod (29) corresponds to the pressure sensor (28). The compression spring (30) is sleeved on the circumference of the driving rod (29). The compression spring (30) drives the driving rod (29) away from the installation box (31).

7. A gas safety shut-off valve according to claim 4, characterized in that A sealing ring (23) is provided between the mounting sleeve (12) and the fixing ring (11).

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