Leakage-proof wellhead gate valve for oil exploitation

Abstract

The utility model discloses an anti-leakage wellhead gate valve for oil exploitation, which belongs to the technical field of gate valves and comprises a gate valve, a liquid inlet and a liquid outlet are arranged on two sides of the gate valve, a first connecting cylinder is arranged at the top of the gate valve, and a second connecting cylinder is arranged at the top of the first connecting cylinder. A rotating rod penetrates through the middle parts of the first connecting cylinder and the second connecting cylinder; by arranging the connecting disc and matching the movable plate movably arranged on the connecting disc with the clamping block, fixing of the connecting rod on the rotating disc is achieved, the flashboard of the rotating disc is further locked, misoperation caused by vibration or pressure impact is prevented, early warning of internal pressure is facilitated by arranging the connecting cylinder, and when petroleum leaks, oil leakage is prevented. The sealing layer is extruded to drive the movable block to move, and the striking pigment smeared on the movable block is used for prompting inspectors to quickly discover, so that inspection and maintenance are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to a leak-proof wellhead gate valve for oil drilling. Background Technology

[0002] Gate valves, as a commonly used device for cutting off or opening fluids, are widely used in oil extraction and transportation.

[0003] During long-term use, excessive flow velocity and pressure in the medium of a gate valve may lead to leakage, affecting the efficiency of oil transportation. Furthermore, once a leakage occurs, it may be difficult for inspection personnel to detect it in a timely manner.

[0004] Therefore, we propose a leak-proof wellhead gate valve for oil extraction. Utility Model Content

[0005] In view of the shortcomings of the prior art, this utility model provides a leak-proof wellhead gate valve for oil extraction, which overcomes the shortcomings of the prior art and aims to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a leak-proof wellhead gate valve for oil extraction, comprising a gate valve, with an inlet and an outlet on both sides of the gate valve, a first connecting cylinder at the top of the gate valve, a second connecting cylinder at the top of the first connecting cylinder, a rotating rod penetrating through the middle of the first and second connecting cylinders, the rotating rod extending into the interior of the first connecting cylinder, the bottom of the rotating rod being connected to a valve stem via a bushing, a gate plate at the bottom of the valve stem, a rotating disk at the top of the rotating rod, a connecting disk fixedly mounted on the outer ring of the first connecting cylinder, a movable plate slidably mounted on the connecting disk, an installation cylinder on the outer ring of the first connecting cylinder, the installation cylinder communicating with the first connecting cylinder, and a through hole adapted to the valve stem being opened at the bottom of the first connecting cylinder, a cavity being opened inside the first connecting cylinder, the cavity being filled with sealing rubber, the installation cylinder being hollow inside, and a movable block being movably mounted on the surface of the installation cylinder, the surface of the movable block being coated with conspicuous pigment.

[0007] In a preferred embodiment, the present invention can be further configured such that: a sealing groove is provided on the inner bottom side of the gate valve corresponding to the gate plate, and a sealing ring is wrapped around the outer ring of the gate plate.

[0008] In a preferred embodiment, the present invention can be further configured such that: a clamping block is provided at the top of the movable plate, a connecting rod is provided in the middle of the rotating disk, the connecting rod is fixedly connected to the rotating rod, and the clamping block is provided corresponding to the connecting rod.

[0009] In a preferred embodiment, the present invention can be further configured as follows: a connecting sleeve is provided on the rotating rod, a first threaded groove is provided inside the connecting sleeve, a threaded ring is provided on the top outer ring of the second connecting cylinder, the connecting sleeve and the second connecting cylinder are threadedly connected, a second threaded groove is provided on the inner wall of the second connecting cylinder, and a sleeve is provided on the rotating rod, the sleeve being threaded.

[0010] In a preferred embodiment, the present invention can be further configured such that: the bottom of the first connecting cylinder is provided with an inner ring, which is fixedly threaded to the gate valve through the inner ring, and the connection is wrapped with a sealing sleeve.

[0011] The beneficial effects of this utility model are:

[0012] This utility model uses a connecting plate, and through the cooperation of a movable plate and a clamping block on the connecting plate, it fixes the connecting rod on the rotating disk, further locking the gate and preventing misoperation due to vibration or pressure impact.

[0013] The connecting cylinder facilitates early warning of internal pressure. When oil leaks, the sealing layer is squeezed to move the movable block. The conspicuous paint on the movable block is used to alert patrol personnel to quickly detect the leak, facilitating inspection and maintenance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the mounting cylinder structure of this utility model;

[0016] Figure 3 This is a cross-sectional view of the gate valve structure of this utility model;

[0017] Figure 4 This is a bottom view of the first connecting cylinder structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the rotating rod structure of this utility model.

[0019] In the diagram: 1. Gate valve; 2. Outlet; 3. Inlet; 4. First connecting cylinder; 5. Connecting plate; 6. Movable plate; 7. Clamping block; 8. Rotating plate; 9. Rotating rod; 10. Connecting sleeve; 11. Second connecting cylinder; 12. Connecting rod; 13. Mounting cylinder; 14. Movable block; 15. Sealing groove; 16. Threaded ring; 17. Sleeve; 18. Valve stem; 19. Gate plate; 20. Sealing ring; 21. Inner ring; 22. Cavity. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-5 A leak-proof wellhead gate valve for oil exploration includes a gate valve 1, with an inlet 3 and an outlet 2 on both sides of the gate valve 1. A first connecting cylinder 4 is welded to the top of the gate valve 1, and a second connecting cylinder 11 is provided on the top of the first connecting cylinder 4. The first connecting cylinder 4 and the second connecting cylinder 11 are integrally formed. A rotating rod 9 is provided through the middle of the first connecting cylinder 4 and the second connecting cylinder 11. The rotating rod 9 extends into the interior of the first connecting cylinder 4. The bottom of the rotating rod 9 is connected to a valve stem 18 through a bushing. A gate plate 19 is welded to the bottom of the valve stem 18. A rotating disk 8 is provided on the top of the rotating rod 9. A connecting disk 5 is welded to the outer ring of the first connecting cylinder 4. A movable plate 6 is slidably provided on the connecting disk 5. An installation cylinder 13 is provided on the outer ring of the first connecting cylinder 4.

[0022] The superimposed structure of the first connecting cylinder 4 and the second connecting cylinder 11 forms a multi-layered sealing cavity, which provides stable support for the rotating rod 9 and reduces the risk of leakage through layered pressure buffering. The operator locks the rotating disk 8 by pushing the movable plate 6 to the connecting rod 12 on the rotating disk 8. The mounting cylinder 13 serves as an auxiliary sealing monitoring channel; its internal cavity can provide real-time feedback on the sealing status, facilitating early warning of potential leaks.

[0023] A sealing groove 15 is provided on the bottom inner side of the gate valve 1 corresponding to the gate plate 19, and a sealing ring 20 is wrapped around the outer ring of the gate plate 19.

[0024] The nested combination of the sealing groove 15 and the sealing ring 20 forms the first dynamic sealing defense line. The trapezoidal cross-section design of the sealing groove 15 guides the fluid pressure to act on the sidewall of the sealing ring 20, enhancing its fit with the groove wall. The sealing ring 20 is made of high-temperature resistant fluororubber, which compensates for gaps through elastic deformation when the gate 19 rises and falls, adapting to pipeline pressure fluctuations. When the valve is closed, the sealing ring 20 expands outward under hydraulic pressure, forming a double seal in both the radial and axial directions, effectively blocking the penetration of particulate oil and gas media.

[0025] Clamping blocks 7 are symmetrically installed on the top of the movable plate 6, and a connecting rod 12 is provided in the middle of the rotating disk 8. The connecting rod 12 is welded and fixed to the top of the rotating rod 9, and the clamping blocks 7 are set corresponding to the connecting rod 12.

[0026] The clamping block 7 and the connecting rod 12 work together to achieve a dual locking mechanism for the valve. During normal operation, the rotating disc 8 drives the rotating rod 9 to rotate via the connecting rod 12 to control the gate 19. When the valve needs to be maintained in its current state for an extended period, the sliding movable plate 6 causes the clamping block 7 to engage with the groove in the connecting rod 12, forming a mechanical interlock to prevent misoperation due to vibration or pressure impact. The contact surface of the clamping block 7 has a toothed structure, which increases friction to ensure a secure lock.

[0027] A connecting sleeve 10 is fitted on the rotating rod 9. The connecting sleeve 10 has a first threaded groove inside. The top outer ring of the second connecting cylinder 11 has a threaded ring 16. The connecting sleeve 10 and the second connecting cylinder 11 are threadedly connected. The inner wall of the second connecting cylinder 11 has a second threaded groove. A sleeve 17 is fitted on the rotating rod 9. The sleeve 17 has threads.

[0028] The threaded linkage system between the connecting sleeve 10 and the second connecting cylinder 11 enables stroke control of the rotating rod 9. The external thread of the sleeve 17 engages with the second thread groove on the inner wall of the second connecting cylinder 11 to form a self-locking structure, preventing the high-pressure fluid from pushing the rotating rod 9 to displacement in the opposite direction.

[0029] The mounting cylinder 13 is connected to the first connecting cylinder 4, and the bottom of the first connecting cylinder 4 is provided with a through hole that is compatible with the valve stem 18. The first connecting cylinder 4 is provided with a cavity 22, which is filled with sealing rubber. The mounting cylinder 13 is hollow inside, and a movable block 14 is movably provided on the surface of the mounting cylinder 13. The surface of the movable block 14 is coated with eye-catching pigment.

[0030] Specifically, a portion of the movable block 14 extends into the interior of the mounting cylinder 13, where a spring is installed. The spring is fixedly connected to the movable block 14. A piston is installed inside the mounting cylinder 13, with one end fixedly connected to the spring and the other end extending into the interior of the first connecting cylinder 4. The movable block 14 of the mounting cylinder 13 serves as a leakage indicator, with its interior connected to the sealing cavity via a spring. In the event of a leak, pressure changes will push the movable block 14 outward, revealing a conspicuous mark and providing a visual warning.

[0031] The bottom of the first connecting cylinder 4 is provided with an inner ring 21, which is fixedly threaded to the gate valve 1 through the inner ring 21, and the connection is wrapped with a sealing sleeve.

[0032] Working principle:

[0033] When this gate valve 1 is in use, the operator rotates the rotating disc 8, which drives the rotating rod 9 to rotate through the connecting rod 12. The valve stem 18 rises vertically under the action of the thread, the gate plate 19 disengages from the sealing groove 15, and the fluid flows from the inlet 3 to the outlet 2, thus opening the gate valve 1.

[0034] When it is necessary to close the gate valve 1, the rotating disk 8 is rotated in the opposite direction, the valve stem 18 pushes the gate plate 19 to move down, the sealing ring 20 expands under pressure, fills the trapezoidal space of the sealing groove 15, and forms a double seal in the radial and axial directions.

[0035] By pushing the movable plate 6, the clamping block 7 is inserted into the groove of the connecting rod 12, locking the rotating disk 8 to prevent malfunctions caused by vibration, thus limiting the connecting rod 12 and further ensuring that the rotating disk 8 and the rotating rod 9 will not be deflected by force.

[0036] The sealing layer inside the first connecting cylinder 4 seals the valve stem 18 and the gate valve 1. When leakage occurs, the sealing layer squeezes the piston, and the piston is forced to push the movable block 14 outward, revealing a mark painted with a conspicuous color, which is easy for inspectors to find and for inspection.

[0037] Finally, it should be noted that in the description of this utility model, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leak-proof wellhead gate valve for oil extraction, characterized in that, Includes a gate valve (1), with an inlet (3) and an outlet (2) on both sides of the gate valve (1). A first connecting cylinder (4) is provided on the top of the gate valve (1), and a second connecting cylinder (11) is provided on the top of the first connecting cylinder (4). A rotating rod (9) is provided through the middle of the first connecting cylinder (4) and the second connecting cylinder (11). The rotating rod (9) extends into the interior of the first connecting cylinder (4). The bottom of the rotating rod (9) is connected to the valve stem (18) through a bushing. A gate plate (19) is provided at the bottom of the valve stem (18), and a rotating disk (8) is provided at the top of the rotating rod (9). A connecting plate (5) is fixedly provided on the outer ring of the connecting cylinder (4), and a movable plate (6) is slidably provided on the connecting plate (5). An installation cylinder (13) is provided on the outer ring of the first connecting cylinder (4). The installation cylinder (13) is connected to the first connecting cylinder (4), and a through hole adapted to the valve stem (18) is opened at the bottom of the first connecting cylinder (4). A cavity (22) is opened inside the first connecting cylinder (4), and the cavity (22) is filled with sealing rubber. The interior of the installation cylinder (13) is hollow, and a movable block (14) is movably provided on the surface of the installation cylinder (13). The surface of the movable block (14) is coated with eye-catching pigment.

2. The oil wellhead gate valve for preventing leakage as described in claim 1, characterized in that, The bottom inner side of the gate valve (1) is provided with a sealing groove (15) corresponding to the gate plate (19), and the outer ring of the gate plate (19) is wrapped with a sealing ring (20).

3. The oil wellhead gate valve for preventing leakage as described in claim 1, characterized in that, The top of the movable plate (6) is provided with a clamping block (7), and the middle of the rotating disk (8) is provided with a connecting rod (12). The connecting rod (12) is fixedly connected to the rotating rod (9), and the clamping block (7) is provided corresponding to the connecting rod (12).

4. The oil wellhead gate valve for preventing leakage as described in claim 1, characterized in that, A connecting sleeve (10) is provided on the rotating rod (9). A first threaded groove is provided inside the connecting sleeve (10). A threaded ring (16) is provided on the top outer ring of the second connecting cylinder (11). The connecting sleeve (10) and the second connecting cylinder (11) are threadedly connected. A second threaded groove is provided on the inner wall of the second connecting cylinder (11). A sleeve (17) is provided on the rotating rod (9). A thread is provided on the sleeve (17).

5. A leak-proof wellhead gate valve for oil extraction according to claim 1, characterized in that, The bottom of the first connecting cylinder (4) is provided with an inner ring (21), which is fixedly threaded to the gate valve (1) through the inner ring (21), and the connection is wrapped with a sealing sleeve.

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