A low-power and low-power-consumption emergency cut-off device and method

Abstract

The present invention discloses a low-power and low-power-consumption emergency cut-off device and method. The valve body and the valve cover are connected by high-strength bolts. The top cover is connected to the valve cover by threads. The upper cover is connected to the top cover by threads. The mounting base plate is connected to the upper cover by screws. The motor passes through the explosion-proof box and is connected to the mounting base plate. The small gear is connected to the motor shaft. The lead screw nut is connected to the large gear through the upper cover by bearings and is fixed using a locking nut. The handle nut is connected to the lead screw nut through a second key. The lead screw cap is connected to the lead screw nut. The protective cover is connected to the mounting base plate. The lead screw is connected to the sliding sleeve through an anti-rotation bracket. The valve stem passes through the sliding sleeve and is connected to the slider. The top cover is connected to the valve seat through a suspension core. The closing valve core is connected to the locking cap. The present invention can not only perform remote switch control under live conditions, but also automatically cut off when the pipeline pressure exceeds the set value or the upstream pipeline suddenly increases in pressure or the downstream pipeline suddenly loses pressure, achieving the purpose of protecting the natural gas transmission pipeline.

Description

Technical Field

[0001] The present invention relates to the field of safe operation of natural gas pipelines, and particularly relates to a low-power and low-power consumption emergency cut-off device and method. Background Art

[0002] A large number of natural gas production areas in China are mostly in deserts, wastelands and mountains, which makes it extremely difficult to conduct well inspections and management. The required labor is of high quality and large quantity, and the cost increases year by year. The digital management of natural gas wells has become a major trend to solve this problem. At present, although the on-site installed emergency cut-off device can achieve remote switching, it requires a large power supply. Once the solar panel loses power or the voltage drops, the entire pipeline control will be completely paralyzed and cannot play a role in protecting the natural gas pipeline. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-power and low-power consumption emergency cut-off device and method to overcome the defects of the prior art. The present invention can not only perform remote switching control when powered on, but also automatically cut off when there is no power and the pipeline pressure exceeds the set value or the upstream pipeline suddenly increases in pressure or the downstream pipeline suddenly loses pressure, so as to achieve the purpose of protecting the natural gas pipeline.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A low-power and low-power consumption emergency cut-off device includes a valve body. The high-pressure end of the valve body is connected to the upstream pipeline of the natural gas pipeline, and the low-pressure end of the valve body is connected to the downstream pipeline of the natural gas pipeline. A valve cover is connected to the valve body, a top cover is connected to the valve cover, an upper cover is connected to the top cover, a mounting base plate is connected to the upper cover, a motor is connected to the mounting base plate, a lead screw nut is inserted through the upper cover by a bearing, the output shaft of the motor is connected to a small gear by a first key, the small gear meshes with a large gear connected to the lead screw nut, the large gear and the lead screw nut are connected by a key and fixed with a locking nut, a lead screw matched with the lead screw nut is inserted inside the lead screw nut, the bottom of the lead screw is connected to a sliding sleeve through an anti-rotation bracket, a slider is arranged in the sliding sleeve, the slider is connected to a valve rod inserted through the sliding sleeve, the lower part of the valve rod passes through the top cover and is connected to a closing valve core, the lower part of the top cover is connected to a valve seat arranged in the valve body through a suspension core, the closing valve core is located inside the suspension core, a spring is arranged in the valve seat, a locking cap matched with the valve rod is arranged on the upper part of the closing valve core, a detection port is opened on the side wall of the top cover, a high-pressure stop valve is connected to the detection port, and a pressure sensor is arranged between the detection port and the high-pressure stop valve.

[0006] Further, the motor passes through an explosion-proof box and is connected to the mounting base plate.

[0007] Further, a handle nut is connected to the outside of the lead screw nut by a second key.

[0008] Furthermore, a lead screw cap is connected to the top of the lead screw nut.

[0009] Furthermore, the valve cover is connected to the valve body by a number of high-strength bolts, and a gasket ring is provided at the connection between the valve cover and the valve body.

[0010] Furthermore, a protective cover capable of protecting the large gear and the small gear is connected to the mounting base plate.

[0011] Furthermore, a first sealing ring is provided at the position where the valve stem passes through the top cover, a second sealing ring is provided at the connection between the top cover and the valve cover, a third sealing ring is provided at the connection between the valve seat and the valve body, a fourth sealing ring cooperating with the valve seat is provided on the closing valve core, and a fifth sealing ring cooperating with the closing valve core is provided at the lower end of the valve stem.

[0012] A low-power and low-power-consumption emergency cut-off method. During normal production, there is a certain distance between the sealing surface of the closing valve core and the valve seat. The gas in the gas pipeline enters the valve cover through the high-pressure end of the valve body, and then passes through the hanging core and the side hole of the closing valve core to enter the low-pressure end, forming an air flow channel;

[0013] When it is necessary to cut off the gas pipeline, control the motor to rotate to drive the small gear, large gear, and lead screw nut to rotate. The lead screw moves downward, pushing the valve stem and the closing valve core downward to the valve seat. The closing valve core seals with the valve seat to cut off the gas pipeline;

[0014] When the pressure sensor detects that the pressure in the gas pipeline exceeds or is lower than the set value, control the motor to perform the valve closing action;

[0015] When the upstream gas pipeline suddenly pressurizes or the downstream gas pipeline suddenly loses pressure, without the motor acting, the slider moves downward in the sliding sleeve, driving the valve stem and the closing valve core downward to the valve seat. The closing valve core seals with the valve seat to cut off the gas pipeline.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] When the present invention is in use, when it is necessary to cut off the pipeline, the program gives a command to the motor, and the motor rotates to drive the small gear, the large gear, and the lead screw nut to rotate, and the lead screw moves downward, pushing the valve stem and the closing valve core to move down to the valve seat, and the closing valve core is sealed with the valve seat to cut off the pipeline; when the pressure sensor detects that the pipeline pressure exceeds or is lower than the set value, the program will automatically give a command to the motor to execute the valve closing action. When the upstream pipeline is suddenly pressurized or the downstream pipeline is suddenly depressurized, there is no need for the motor to move, and the slider moves down in the sleeve, driving the valve stem and the closing valve core to move down to the valve, and the closing valve core is sealed with the valve seat to cut off the pipeline. In this process, the key point is that when the pipeline is normally transmitting gas, a certain free stroke is left between the slider and the sleeve, and the valve stem and the closing valve core are in a suspended static equilibrium state under the action of air pressure. When the pipeline pressure fluctuates greatly, the slider can drive the valve stem and the closing valve core to move down to the valve seat. The present invention can not only perform remote switch control when powered, but also automatically cut off when the pipeline pressure exceeds the set value or the upstream pipeline suddenly increases pressure or the downstream pipeline suddenly loses pressure, thereby achieving the purpose of protecting the natural gas transmission pipeline.

[0018] In addition, when the shutoff device needs to be opened to restore the pipeline, the program gives the motor a command, and the motor rotates to drive the small gear, large gear, and screw nut to rotate, and the screw moves upward, pulling the valve stem and closing the valve core to move up a certain distance from the valve seat, so that the seal on the closing valve core is out of the valve seat, and the pipeline air flow channel is opened. In this process, the focus is on the use of two-stage lifting when lifting the closing valve core. When the motor pulls the valve stem upward, it first pulls open the seal between the valve stem and the closing valve core, so that a small channel for upstream and downstream airflow is opened. After the pipeline pressure is balanced for a period of time, the closing valve core is lifted again to disengage the seal between it and the valve seat. In this process, the power used by the motor is greatly reduced. The sealing ring at the lower end of the valve stem can be separated from the closing valve core with low voltage and low power, forming a small air flow channel first, and then the closing valve core can be easily lifted to form a large air flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Among them, 1. Motor; 2. Explosion-proof box; 3. Mounting base plate; 4. Protective cover; 5. Small gear; 6. First key; 7. Large gear; 8. Locking nut; 9. Handle nut; 10. Screw cap; 11. Screw; 12. Screw nut; 13. Second key; 14. Bearing; 15. Upper cover; 16. Anti-rotation bracket; 17. Sleeve; 18. Slider; 19. Pressure sensor; 20. High-pressure stop valve; 21. First sealing ring; 22. Top cover; 23. Second sealing ring; 24. Valve stem; 25. Valve cover; 26. Third sealing ring; 27. Valve body; 28. Valve seat; 29. ​​Spring; 30. Sealing gasket; 31. Suspension core; 32. High-strength bolt; 33. Fourth sealing ring; 34. Close valve core; 35. Locking cap; 36. Fifth sealing ring. Detailed implementation mode

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] A small-power and low-power-consumption emergency cut-off device can also work under low voltage or no power. The high-voltage end on the left side of the device is connected to the upstream pipeline of the gas transmission pipeline, and the low-voltage end on the right side is connected to the downstream pipeline of the gas transmission pipeline. There is a sealing gasket ring 30 between the valve body 27 and the valve cover 25, which is connected by 10 high-strength bolts 32. The top cover 22 is connected to the valve cover 25 by thread, and there is a second sealing ring 23 between them. The upper cover 15 is connected to the top cover 22 by thread. The mounting base plate 3 is connected to the upper cover 15 by screws. The motor 1 passes through the explosion-proof box 2 and is connected to the mounting base plate 3. The small gear 5 is connected to the shaft of the motor 1. The lead screw nut 12 passes through the upper cover 15 through the bearing 14 and is connected to the large gear 7, and is fixed by using a lock nut 8. The handle nut 9 is connected to the lead screw nut 12 through the second key 13. The lead screw guard cap 10 is connected to the lead screw nut 12. The protective cover 4 is connected to the mounting base plate 3. The lead screw 11 is connected to the sliding sleeve 17 through the anti-rotation bracket 16. The valve stem 24 passes through the sliding sleeve 17 and is connected to the slider 18. There is a first sealing ring 21 between the valve stem 24 and the top cover 22. The top cover 22 is connected to the valve seat 28 through the suspension core 31. The closing valve core 34 is connected to the locking cap 35.

[0023] During normal production, the cut-off device is in the open state. There is a certain distance between the sealing surface of the closing valve core 34 and the valve seat 28. The pipeline gas enters the valve cover 25 through the high-voltage end of the valve body 27, and then passes through the suspension core 31 and the side hole of the closing valve core 34 into the low-voltage end, forming an air flow channel.

[0024] When it is necessary to cut off the pipeline, the program gives an order to the motor 1. The motor 1 rotates to drive the small gear 5, the large gear 7, and the lead screw nut 12 to rotate. The lead screw 11 moves downward, pushing the valve stem 24 and the closing valve core 34 downward to the valve seat 28. The fourth sealing ring 33 on the closing valve core 34 seals with the valve seat 28, cutting off the pipeline.

[0025] When the pressure sensor 19 detects that the pipeline pressure exceeds or is lower than the set value, the program will automatically give an order to the motor 1 to perform the valve closing action.

[0026] When the upstream pipeline suddenly increases in pressure or the downstream pipeline suddenly loses pressure, without the motor 1 acting, the slider 18 moves downward in the sliding sleeve 17, driving the valve stem 24 and the closing valve core 34 downward to the valve seat 28. The fourth sealing ring 33 on the closing valve core 34 seals with the valve seat 28, cutting off the pipeline. In this process, the key point is that when the pipeline is normally transporting gas, there is a certain free stroke between the slider 18 and the sliding sleeve 17. The valve stem 24 and the closing valve core 34 are in a floating static balance state under the action of air pressure. When the pipeline pressure fluctuates greatly, the slider 18 can drive the valve stem 24 and the closing valve core 34 downward to the valve seat 28.

[0027] When the pipeline is in a truncated state and it is necessary to open the truncating device to restore the pipeline, the program gives a command to motor 1. Motor 1 rotates to drive the pinion gear 5, the large gear 7, and the lead screw nut 12 to rotate. The lead screw 11 moves upward, pulling the valve stem 24 and the closing valve core 34 upward to leave the valve seat 28 by a certain distance. The fourth sealing ring 33 on the closing valve core 34 disengages from the valve seat 28, and the gas flow channel of the pipeline is opened. In this process, the key point is that a two-stage lifting is used when lifting the closing valve core 34. When the motor 1 pulls the valve stem 24 upward, the fifth sealing ring 36 between the valve stem 24 and the closing valve core 34 is first pulled open, so that a small channel for the upstream and downstream airflows is opened. After the pipeline pressure is balanced for a period of time, the closing valve core 34 is lifted a second time to disengage the fourth sealing ring 33 between it and the valve seat 28. In this process, the power consumption of the motor 1 is greatly reduced. A small voltage and low power can make the fifth sealing ring 36 at the lower end of the valve stem 24 disengage from the closing valve core 34, first forming a small air flow channel, and then the closing valve core 34 can be easily lifted to form a large air flow channel.

Claims

1. A low-power and low-power-consumption emergency cut-off device, characterized in that, It includes a valve body (27). The high-pressure end of the valve body (27) is connected to the upstream pipeline of the gas transmission pipeline, and the low-pressure end of the valve body (27) is connected to the downstream pipeline of the gas transmission pipeline. A valve cover (25) is connected to the valve body (27), a top cover (22) is connected to the valve cover (25), an upper cover (15) is connected to the top cover (22), a mounting base plate (3) is connected to the upper cover (15), a motor (1) is connected to the mounting base plate (3), a lead screw nut (12) is inserted through the upper cover (15) via a bearing (14). The output shaft of the motor (1) is connected to a small gear (5) through a first key (6). The small gear (5) meshes with a large gear (7) connected to the lead screw nut (12). The large gear (7) and the lead screw nut (12) are connected by a key and fixed with a lock nut (8). A lead screw (11) that mates with it is inserted inside the lead screw nut (12). The bottom of the lead screw (11) is connected to a sliding sleeve (17) through an anti-rotation bracket (16). A slider (18) is arranged in the sliding sleeve (17). The slider (18) is connected to a valve stem (24) inserted through the sliding sleeve (17). The lower part of the valve stem (24) passes through the top cover (22) and is connected to a closing valve core (34). The lower part of the top cover (22) is connected to a valve seat (28) arranged in the valve body (27) through a suspension core (31). The closing valve core (34) is located inside the suspension core (31). A spring (29) is arranged in the valve seat (28). A lock nut (35) that mates with the valve stem (24) is arranged on the upper part of the closing valve core (34). A detection port is opened on the side wall of the top cover (22), and a high-pressure stop valve (20) is connected to the detection port. A pressure sensor (19) is arranged between the detection port and the high-pressure stop valve (20); The motor (1) passes through an explosion-proof box (2) and is connected to the mounting base plate (3); A handle nut (9) is connected to the outside of the lead screw nut (12) through a second key (13).

2. The small-power and low-power-consumption emergency cut-off device according to claim 1, wherein A lead screw cap (10) is connected to the top of the lead screw nut (12).

3. The low-power and low-power-consumption emergency cut-off device according to claim 1, characterized in that, The valve cover (25) is connected to the valve body (27) through a number of high-strength bolts (32), and a sealing gasket ring (30) is arranged at the connection between the valve cover (25) and the valve body (27).

4. A low-power and low-power-consumption emergency cut-off device according to claim 1, characterized in that, A protective cover (4) that can protect the large gear (7) and the small gear (5) is connected to the mounting base plate (3).

5. A low-power and low-power-consumption emergency cut-off device according to claim 1, characterized in that, A first sealing ring (21) is arranged at the position where the valve stem (24) passes through the top cover (22), a second sealing ring (23) is arranged at the connection between the top cover (22) and the valve cover (25), a third sealing ring (26) is arranged at the connection between the valve seat (28) and the valve body (27), a fourth sealing ring (33) that mates with the valve seat (28) is arranged on the closing valve core (34), and a fifth sealing ring (36) that mates with the closing valve core (34) is arranged at the lower end of the valve stem (24).

6. A low-power and low-power-consumption emergency cutoff method, which uses a low-power and low-power-consumption emergency cutoff device described in claim 1, and is characterized in that, During normal production, there is a certain distance between the sealing surface of the closing valve core (34) and the valve seat (28). The gas in the gas transmission pipeline enters the valve cover (25) through the high-pressure end of the valve body (27), and then passes through the suspension core (31) and the side holes of the closing valve core (34) to enter the low-pressure end, forming an air flow channel; When it is necessary to cut off the gas pipeline, control the motor (1) to rotate, driving the pinion gear (5), the large gear (7), and the lead screw nut (12) to rotate. The lead screw (11) moves downward, pushing the valve stem (24) and the closing valve core (34) downward to the valve seat (28). The closing valve core (34) seals with the valve seat (28), cutting off the gas pipeline. When the pressure sensor (19) detects that the pressure of the gas pipeline exceeds or is lower than the set value, control the motor (1) to perform the valve closing action. When the upstream gas pipeline suddenly increases in pressure or the downstream gas pipeline suddenly loses pressure, without the motor (1) acting, the slider (18) moves downward within the sliding sleeve (17), driving the valve stem (24) and the closing valve core (34) downward to the valve seat (28). The closing valve core (34) seals with the valve seat (28), cutting off the gas pipeline.

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