Well safety cut-off device

Abstract

The present invention relates to the technical field of oil and gas wells, and provides a well safety shutoff device, comprising a valve body assembly, the valve body assembly comprising a main valve body, a first valve seat, a gate plate, and a second valve seat, the first valve seat, the gate plate, and the second valve seat being sequentially arranged within the main valve body, an air guide channel being provided within the main valve body, a first air flow channel being provided within the first valve seat, a second air flow channel being provided within the second valve seat, a pressure relief hole being provided within the gate plate, the air guide channel being respectively connected to the first and second air flow channels, and the pressure relief hole being connected to the second air flow channel. High-pressure gas in the internal cavity of the first valve seat can be introduced into the second air flow channel of the second valve seat, thereby reducing the positive pressure exerted by the first and second valve seats on the gate plate, thereby reducing the frictional force exerted by the first and second valve seats on the gate plate, achieving low-torque opening under high pressure, reducing the positive pressure exerted by the valve seat when the valve is opened, and thereby extending the service life of the well safety shutoff device.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas wells, and in particular to a well safety cut-off device. Background Art

[0002] In the production of high-pressure gas wells, when the gas transmission pressure exceeds the set value, the pipeline ruptures and leaks, causing the gas transmission pressure to fall below the set value, or a fire occurs, the well safety shut-off device will quickly close the valve and cut off the wellhead gas source, thereby protecting the safety of station equipment, preventing major accidents from spreading, and achieving the purpose of safe production.

[0003] The current well safety shut-off devices are mainly pneumatically controlled and hydraulically controlled. However, when these well safety shut-off devices are opened at high pressure, the valve seat is subjected to excessive force, which affects the service life of the valve in the later stage. Regular air replenishment is also required, which is inconvenient for maintenance. In addition, when the power is lost on site, the hydraulic oil backflow causes the valve to slowly close, seriously affecting production output. Summary of the Invention

[0004] The present invention provides a well safety cut-off device for solving the technical problem in the prior art that the valve seat of the well safety cut-off device is subjected to excessive force when the valve is opened at high pressure, thereby reducing the positive pressure of the valve seat when the valve is opened and extending the service life.

[0005] The present invention provides a well safety shut-off device, comprising a valve body assembly, the valve body assembly comprising a main valve body, a first valve seat, a gate plate, and a second valve seat, the first valve seat, the gate plate, and the second valve seat being sequentially arranged in the main valve body, an air guide channel being provided in the main valve body, a first air flow channel being provided in the first valve seat, a second air flow channel being provided in the second valve seat, and a pressure relief hole being provided in the gate plate;

[0006] The air guide channel is connected to the first air flow channel and the second air flow channel respectively, and the pressure relief hole is connected to the second air flow channel.

[0007] According to the present invention, a well safety cut-off device further includes: a pilot component, the pilot component is connected to the main valve body, a pilot channel and a control valve for controlling the on-off of the pilot channel are provided in the pilot component, the air guide channel includes a first air guide section and a second air guide section, the two ends of the first air guide section are respectively connected to the first air flow channel and the pilot channel, and the two ends of the second air guide section are respectively connected to the pilot channel and the second air flow channel.

[0008] According to a well safety shutoff device provided by the present invention, the valve body assembly further includes a first auxiliary valve body and a second auxiliary valve body, wherein the first auxiliary valve body and the second auxiliary valve body are respectively installed on both sides of the main valve body.

[0009] According to a well safety shut-off device provided by the present invention, a sleeve is further provided in the main valve body, and the sleeve is arranged around the outside of the first valve seat. One end of the sleeve is connected to the first auxiliary valve body, and the other end of the sleeve is against the gate plate.

[0010] According to a well safety cut-off device provided by the present invention, a conducting hole is provided in the insert sleeve, and the conducting hole is used to connect the first air flow channel and the air guide channel.

[0011] According to a well safety shut-off device provided by the present invention, an annular groove is provided on the side of the first auxiliary valve body close to the sleeve, the bottom surface of the annular groove is flush with the inner side of the sleeve, an annular adjusting piece is suitable for being clamped in the annular groove, and an elastic piece is connected to the side of the annular adjusting piece away from the first auxiliary valve body, and the elastic piece is connected to the first valve seat.

[0012] According to the present invention, a well safety shut-off device further includes: a control component, the gate plate is provided with a connecting groove, a valve stem is installed in the connecting groove, the end of the valve stem extends out of the connecting groove and is connected to the control component, and is used to use the control component to drive the valve stem to perform a valve closing action.

[0013] According to a well safety shutoff device provided by the present invention, the control assembly includes a mounting plate, a remote control valve closing mechanism, an emergency valve closing mechanism, a connecting rod locking mechanism, a locking block, and a driving rod, wherein the locking block is connected to the valve stem, the connecting rod locking mechanism is connected to the locking block, the middle portion of the driving rod is adapted to be rotatably mounted on the mounting plate via a locking shaft, one end of the driving rod is adapted to be connected to the mounting plate via an elastic member, and the other end of the driving rod is connected to the connecting rod locking mechanism;

[0014] Wherein, the output end of the remote valve closing mechanism is suitable for being connected to the driving rod through a connecting rod, and the output shaft of the emergency valve closing mechanism is suitable for being connected to the driving rod.

[0015] According to a well safety shut-off device provided by the present invention, the emergency valve closing mechanism includes one or more of a high-pressure valve closing mechanism, a low-pressure valve closing mechanism, a medium-pressure valve closing mechanism, a manual valve closing mechanism and a fire-proof blocking valve closing mechanism.

[0016] According to a well safety cut-off device provided by the present invention, the connecting rod locking mechanism is a frame-type structure, the locking block is arranged on the inner side of the connecting rod locking mechanism, and the connecting rod locking mechanism is fixed to the locking block by a fastener.

[0017] The well safety shut-off device provided in an embodiment of the present invention connects the first air flow channel of the first valve seat and the second air flow channel of the second valve seat by arranging an air guide channel in the main valve body, and connects the pressure relief channel of the gate plate with the second air flow channel. Before opening the well safety shut-off device, such a channel structure can be used to achieve the balance of air pressure on both sides of the gate plate, realize low-torque opening under high pressure, reduce the positive pressure of the valve seat when the valve is opened, and thus extend the service life of the well safety shut-off device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a cross-sectional view of the well safety cut-off device provided by the present invention;

[0020] Figure 2 This is a cross-sectional view from a top view of the valve body assembly in the well safety cut-off device provided by the present invention;

[0021] Figure 3 This is a cross-sectional view from the main perspective of the valve body assembly in the well safety cut-off device provided by the present invention;

[0022] Figure 4 This is a front view of the gate plate in the well safety cut-off device provided by the present invention;

[0023] Figure 5 It is a cross-sectional view of the second valve seat in the well safety cut-off device provided by the present invention;

[0024] Figure 6 It is a structural schematic diagram of the control component in the well safety cut-off device provided by the present invention.

[0025] Reference numerals:

[0026] 1. First auxiliary valve body; 2. Annular adjustment member; 3. Elastic member; 4. First valve seat; 5. Insert; 6. Gate; 7. Second valve seat; 8. Second auxiliary valve body; 9. Positioning pin; 10. Right-angle joint; 11. Upper valve cover; 12. Support seat; 13. Valve stem; 14. Lower valve cover; 15. Balance rod; 16. Main valve body; 17. High-pressure valve closing mechanism; 18. Locking shaft; 19. Manual valve closing mechanism; 20. Fire-blocking valve closing mechanism; 21. Manual support rod; 22. Low-pressure valve closing mechanism; 23. Medium-pressure valve closing mechanism; 24. Remote-controlled valve closing mechanism; 25. Elastic component; 26. Roller assembly; 27. Connecting rod locking mechanism; 28. Connecting rod; 29. Mounting plate; 30. Locking block; 31. Air guide channel; 32. First air flow channel; 33. Second air flow channel; 34. Pressure relief channel; 35. Through hole; 36. Connecting groove; 100. Valve body assembly; 200. Pilot assembly; 300. Control assembly; 400. Lifting assembly. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0030] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0032] The following combination Figures 1-6 The well safety shut-off device of the present invention is described. The well safety shut-off device includes a valve body assembly 100. The valve body assembly 100 includes a main valve body 16, a first valve seat 4, a gate plate 6 and a second valve seat 7. The first valve seat 4, the gate plate 6 and the second valve seat 7 are arranged in sequence in the main valve body 16. An air guide channel 31 is provided in the main valve body 16. A first air flow channel 32 connected to the cavity of the first valve seat 4 is provided in the first valve seat 4. A second air flow channel 33 is provided in the second valve seat 7. A pressure relief channel 34 is provided in the gate plate 6. The air guide channel 31 is connected to the first air flow channel 32 and the second air flow channel 33 respectively, and the pressure relief channel 34 is connected to the second air flow channel 33.

[0033] In this embodiment, an air guide channel 31 is provided in the main valve body 16 to connect the first air flow channel 32 of the first valve seat 4 and the second air flow channel 33 of the second valve seat 7, and the pressure relief channel 34 of the gate plate 6 is connected to the second air flow channel 33. Before opening the well safety shut-off device, such a channel structure can be used to achieve the balance of air pressure on both sides of the gate plate 6, realize low torque opening under high pressure, reduce the positive pressure of the valve seat when the valve is opened, and thus extend the service life of the well safety shut-off device.

[0034] An annular platform is provided inside the main valve body 16 at the end close to the second valve seat 7 , wherein the side of the second valve seat 7 away from the gate plate 6 abuts against the annular platform and is suitable for fixing the position through the positioning pin 9 .

[0035] The sealing surfaces of the gate plate 6, the first valve seat 4 and the second valve seat 7 are sprayed with hard alloy to improve the hardness, wear resistance, strength, toughness, heat resistance and corrosion resistance of the sealing surfaces, thereby achieving the purpose of safe production.

[0036] like Figure 1 As shown, the well safety shut-off device also includes a pilot assembly 200, which is connected to the main valve body 16. A pilot channel and a control valve for controlling the on-off of the pilot channel are provided in the pilot assembly 200. The air guide channel 31 includes a first air guide section and a second air guide section. The two ends of the first air guide section are respectively connected to the first air flow channel 32 and the pilot channel, and the two ends of the second air guide section are respectively connected to the pilot channel and the second air flow channel 33. It can be understood that the control valve in the pilot assembly 200 can be used to control the on-off of the entire channel. When not in use, the control valve can close the pilot channel. When the entire well safety shut-off device needs to be opened, the control valve will open the pilot channel, so that the first air flow channel 32, the air guide channel 31, the pilot channel and the second air flow channel 33 are in a conducting state. In this way, the high-pressure gas in the internal cavity of the first valve seat 4 can be introduced into the second air flow channel 33 of the second valve seat 7, which can reduce the positive pressure of the first valve seat 4 and the second valve seat 7 on the gate plate 6, thereby reducing the friction force of the first valve seat 4 and the second valve seat 7 on the gate plate 6, reducing the lifting force for opening the entire well safety shut-off device, and achieving the purpose of high-pressure and low-torque valve opening.

[0037] In this embodiment, the control valve can adopt a high-pressure explosion-proof solenoid valve. When the well safety shut-off device needs to be opened, the pilot component 200 is instantaneously energized, so that the control valve opens the pilot channel to achieve control of the control valve.

[0038] The pilot assembly 200 and the main valve body 16 of the valve body assembly 100 can be connected by a right-angle joint 10. At this time, two channels are also provided in the right-angle structure, wherein the two channels are respectively used to connect the first gas guide section and the pilot channel, and the second gas guide section and the pilot channel, thereby realizing the penetration of the gas channel.

[0039] According to the well safety shut-off device provided by the present invention, the valve body assembly 100 further includes a first auxiliary valve body 1 and a second auxiliary valve body 8, which are respectively mounted on either side of the main valve body 16. It will be appreciated that the first auxiliary valve body 1 and the second auxiliary valve body 8 are utilized to connect other pipeline components. Specifically, one end of the first auxiliary valve body 1 and the second auxiliary valve body 8 are respectively fixed to either side of the main valve body 16 by fasteners, and the other end of the first auxiliary valve body 1 and the other end of the second auxiliary valve body 8 are respectively provided with flange structures, each of which is also provided with connection holes for connecting other pipeline components.

[0040] like Figure 2 As shown, the main valve body 16 is further provided with a sleeve 5, which surrounds the outside of the first valve seat 4. One end of the sleeve 5 is connected to the first auxiliary valve body 1, and the other end abuts the gate 6. The sleeve 5 can better secure the first valve seat 4 and the first auxiliary valve body 1. Specifically, the sleeve 5 can be assembled into the main valve body 16 using a clearance fit.

[0041] In order to connect the first airflow channel 32 and the air guide channel 31 , a conducting hole 35 is provided in the insert sleeve 5 . One end of the conducting hole 35 is connected to the airflow channel, and the other end of the conducting hole 35 is connected to the air guide channel 31 .

[0042] In this embodiment, an annular groove is provided on the side of the first sub-valve body 1 near the sleeve 5. The bottom of the annular groove is flush with the inner side of the sleeve 5. An annular adjusting member 2 is adapted to be engaged within the annular groove. An elastic member 3 is connected to the side of the annular adjusting member 2 facing away from the first sub-valve body 1. The elastic member 3 is connected to the first valve seat 4. It is understood that the first valve seat 4, gate plate 6, sleeve 5, second valve seat 7, and main valve body 16 are all machined components. Manufacturing tolerances can result in gaps between the first valve seat 4, gate plate 6, sleeve 5, and second valve seat 7 after assembly within the main valve body 16. The provision of the annular adjusting member 2 can avoid such gaps. The annular adjusting member 2 is manufactured separately after assembly to account for tolerances. The annular adjusting member 2 and elastic member 3 secure the first valve seat 4, gate plate 6, and second valve seat 7 to the interior of the main valve body 16, ensuring a tight connection between them. In other words, the annular adjusting member 2 and elastic member 3 work together to adjust the axial clearance, ensuring a reliable seal during valve opening and closing. In addition, the elastic member 3 can give the first valve seat 4 a pre-tightening force to press on the gate plate 6. At low pressure, the elastic member 3 can provide a very small pre-tightening force to achieve a sealing effect. As the pressure in the first valve seat 4 increases, the force between the first valve seat 4 and the gate plate 6 also increases, that is, the sealing pressure ratio increases, ensuring sealing under high pressure.

[0043] like Figure 1As shown, the well safety shutoff device provided in this embodiment further includes a control assembly 300. The gate plate 6 is provided with a connecting groove 36, in which the valve stem 13 is mounted. The end of the valve stem 13 extends out of the connecting groove 36 and is connected to the control assembly 300. The control assembly 300 is used to drive the valve stem 13 to close the valve. It can be understood that the control assembly 300 controls the movement of the valve stem 13, thereby achieving the valve closing effect.

[0044] The control assembly 300 is located on the upper portion of the valve body assembly 100 , wherein a lifting assembly 400 is also provided on the upper portion of the control assembly 300 .

[0045] like Figure 4 As shown, connecting grooves 36 are provided on both the upper and lower sides of the gate plate 6. The connecting grooves 36 can be configured as T-shaped in cross-section. The lower end of the valve stem 13 is engaged with the upper connecting groove 36, while the balance bar 15 is engaged with the lower connecting groove 36. The upper side of the main valve body 16 is also provided with the upper valve cover 11, support seat 12, and other components, while the lower side of the main valve body 16 is also provided with the lower valve cover 14. Specifically, each of the upper valve cover 11, support seat 12, and lower valve cover 14 is provided with a clearance channel to facilitate the insertion of the valve stem 13 and balance bar 15.

[0046] In this embodiment, the control assembly 300 includes a mounting plate 29, a remote control valve closing mechanism 24, an emergency valve closing mechanism, a connecting rod locking mechanism 27, a locking block 30 and a driving rod, the locking block 30 is connected to the valve stem 13, the connecting rod locking mechanism 27 is connected to the locking block 30, the middle part of the driving rod is suitable for being rotatably mounted on the mounting plate 29 through the locking shaft 18, one end of the driving rod is suitable for being connected to the mounting plate 29 through the elastic member 25, and the other end of the driving rod is connected to the connecting rod locking mechanism 27, wherein the output end of the remote valve closing mechanism is suitable for being connected to the driving rod through the connecting rod 28, and the output shaft of the emergency valve closing mechanism is suitable for being connected to the driving rod.

[0047] The well safety shutoff device is controlled by a locking block 30 controlling the valve stem 13. The mounting plate 29 serves as a positioning mechanism for rotating and fixing the drive rod. After the middle portion of the drive rod is rotatably mounted on the mounting plate 29 via the locking shaft 18, one end of the drive rod can be connected to the elastic member 25 via the roller assembly 26. The elastic member 25 can be connected to a transition piece provided on the mounting plate 29, and the other end is connected to the connecting rod locking mechanism 27. The remote valve closing mechanism and the emergency valve closing mechanism are both connected to the drive rod. The remote valve closing mechanism and the emergency valve closing mechanism can be used to drive the drive rod to rotate about the locking shaft 18, thereby driving the connecting rod locking mechanism 27 to slide. Since the locking block 30 is connected to the connecting rod locking mechanism 27, the position of the locking block 30 can be moved, so that the locking block 30 drives the valve stem 13 to operate and close the valve. After the remote valve closing mechanism and the emergency valve closing mechanism close the valve, the reset action of the elastic member 25 itself can reset the drive rod, thereby returning the connecting rod locking mechanism 27 and the locking block 30 to their initial positions.

[0048] In this embodiment, the elastic member 25 and the elastic member 3 used above can both be springs. Of course, an elastic sheet energy mechanism can also be used, which is not limited in this embodiment.

[0049] The connecting rod 28 connected to the output end of the remote control valve closing mechanism 24 can be set to an L shape, one end of which is fixed to the output end of the remote control valve closing mechanism 24 by a fastener, and the other end of the connecting rod 28 is bent 90 degrees and connected to the driving rod, thereby realizing the control of the driving rod by the remote control valve closing mechanism 24.

[0050] According to the well safety shut-off device provided by an embodiment of the present invention, the emergency valve closing mechanism includes one or more of a high-pressure valve closing mechanism 17, a low-pressure valve closing mechanism 22, a medium-pressure valve closing mechanism 23, a manual valve closing mechanism 19 and a fire-proof blocking valve closing mechanism 20.

[0051] The high-pressure valve closing mechanism 17, the low-pressure valve closing mechanism 22, and the medium-pressure valve closing mechanism 23 can all be cylinder-driven structures, thereby utilizing the cylinder to drive the drive rod. The manual valve closing mechanism 19 includes a manual valve closing rod and a manual support rod 21. The manual valve closing rod is connected to the drive rod. The manual support rod 21 is perpendicularly connected to the manual valve closing rod. The guiding effect of the manual support rod 21 can push the manual valve closing rod forward, thereby driving the manual valve closing rod to move, thereby driving the drive rod to move.

[0052] The high-pressure valve closing mechanism 17, the low-pressure valve closing mechanism 22, and the medium-pressure valve closing mechanism 23 all collect pipeline pressure through the airway. The three cylinders of the high-pressure valve closing mechanism 17, the low-pressure valve closing mechanism 22, and the medium-pressure valve closing mechanism 23 independently detect pressure. When overpressure or underpressure occurs, they can be urgently cut off to achieve valve closing.

[0053] It is understandable that when the high-pressure valve closing mechanism 17, the low-pressure valve closing mechanism 22, the medium-pressure valve closing mechanism 23, the manual valve closing mechanism 19 and the fire-blocking valve closing mechanism 20 are provided at the same time, at least the following valve closing actions are provided:

[0054] 1. When the pressure is too high, the high-pressure valve closing mechanism 17 pulls the driving rod, causing the driving rod to rotate and drive the connecting rod locking mechanism 27 to slide horizontally, so that the position of the locking block 30 is moved to achieve valve closing.

[0055] 2. When the pressure is extremely low, the low-pressure valve closing mechanism 22 pushes the driving rod, causing the driving rod to rotate and drive the connecting rod locking mechanism 27 to slide horizontally, so that the position of the locking block 30 is moved to achieve valve closing.

[0056] 3. The medium-pressure valve closing mechanism 23 will pull the driving rod when the pressure is too high, so that the driving rod rotates and drives the connecting rod locking mechanism 27 to slide horizontally, so that the position of the locking block 30 is moved to achieve valve closing.

[0057] 4. The manual valve closing mechanism 19 can push the driving rod forward through the guiding effect of the manual support rod 21, so that the driving rod rotates and drives the connecting rod locking mechanism 27 to slide horizontally, so that the position of the locking block 30 is moved to achieve valve closing.

[0058] 5. When a fire occurs, the fire-proof blocking valve closing mechanism 20 will melt the fusible alloy and push the driving rod, which will rotate and drive the connecting rod locking mechanism 27 to slide horizontally, so that the position of the locking block 30 is moved to achieve valve closing.

[0059] like Figure 6 As shown, the connecting rod locking mechanism 27 is a frame-shaped structure, and the locking block 30 is disposed inside the connecting rod locking mechanism 27. The connecting rod locking mechanism 27 is fixed to the locking block 30 by fasteners. The connecting rod locking mechanism 27 is generally formed by several rods connected by fasteners. The connecting rod locking mechanism 27 encloses the locking block 30 at the center. When the connecting rod locking mechanism 27 moves, it can effectively drive the locking block 30 to adjust its position.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A well safety cut-off device, characterized in that: The valve body assembly (100) comprises a main valve body (16), a first valve seat (4), a gate plate (6) and a second valve seat (7), wherein the first valve seat (4), the gate plate (6) and the second valve seat (7) are sequentially arranged in the main valve body (16), an air guide channel (31) is provided in the main valve body (16), a first air flow channel (32) communicating with a cavity of the first valve seat (4) is provided in the first valve seat (4), a second air flow channel (33) is provided in the second valve seat (7), and a pressure relief channel (34) is provided in the gate plate (6); The air guide channel (31) is respectively connected to the first air flow channel (32) and the second air flow channel (33), and the pressure relief channel (34) is connected to the second air flow channel (33); The invention also includes: a pilot assembly (200), the pilot assembly (200) being connected to the main valve body (16), a pilot channel and a control valve for controlling the on / off of the pilot channel being provided in the pilot assembly (200), the air guide channel (31) comprising a first air guide section and a second air guide section, the two ends of the first air guide section being respectively connected to the first air flow channel (32) and the pilot channel, and the two ends of the second air guide section being respectively connected to the pilot channel and the second air flow channel (33); The valve body assembly (100) further comprises a first auxiliary valve body (1) and a second auxiliary valve body (8), wherein the first auxiliary valve body (1) and the second auxiliary valve body (8) are respectively mounted on both sides of the main valve body (16).

2. The well safety cut-off device according to claim 1, characterized in that: A sleeve (5) is further provided in the main valve body (16), and the sleeve (5) is arranged around the outside of the first valve seat (4). One end of the sleeve (5) is connected to the first auxiliary valve body (1), and the other end of the sleeve (5) is against the gate plate (6).

3. The well safety cut-off device according to claim 2, characterized in that: A conducting hole (35) is provided in the insert sleeve (5), and the conducting hole (35) is used to connect the first air flow channel (32) and the air guide channel (31).

4. The well safety cut-off device according to claim 2, characterized in that: An annular groove is provided on a side of the first auxiliary valve body (1) close to the insert sleeve (5), and the bottom surface of the annular groove is flush with the inner side of the insert sleeve (5). An annular adjusting member (2) is adapted to be clamped in the annular groove, and an elastic member (3) is connected to a side of the annular adjusting member (2) away from the first auxiliary valve body (1), and the elastic member (3) is connected to the first valve seat (4).

5. The well safety cut-off device according to any one of claims 1 to 4, characterized in that: Also includes: A control assembly (300) is provided in which the gate plate (6) is provided with a connecting groove (36), a valve stem (13) is installed in the connecting groove (36), an end of the valve stem (13) extends out of the connecting groove (36) and is connected to the control assembly (300), and is used to use the control assembly (300) to drive the valve stem (13) to perform a valve closing action.

6. The well safety cut-off device according to claim 5, characterized in that: The control assembly (300) includes a mounting plate (29), a remote control valve closing mechanism (24), an emergency valve closing mechanism, a connecting rod locking mechanism (27), a locking block (30) and a driving rod, wherein the locking block (30) is connected to the valve stem (13), the connecting rod locking mechanism (27) is connected to the locking block (30), the middle portion of the driving rod is suitable for being rotatably mounted on the mounting plate (29) through a locking shaft (18), one end of the driving rod is suitable for being connected to the mounting plate (29) through an elastic member (25), and the other end of the driving rod is connected to the connecting rod locking mechanism (27); The output end of the remote control valve closing mechanism (24) is adapted to be connected to the driving rod via a connecting rod (28), and the output shaft of the emergency valve closing mechanism is adapted to be connected to the driving rod.

7. The well safety cut-off device according to claim 6, characterized in that: The emergency valve closing mechanism comprises one or more of a high-pressure valve closing mechanism (17), a low-pressure valve closing mechanism (22), a medium-pressure valve closing mechanism (23), a manual valve closing mechanism (19) and a fire-proof blocking valve closing mechanism (20).

8. The well safety cut-off device according to claim 6, characterized in that: The connecting rod locking mechanism (27) is a frame-type structure, the locking block (30) is arranged on the inner side of the connecting rod locking mechanism (27), and the connecting rod locking mechanism (27) is fixed to the locking block (30) via a fastener.

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