Valve plate structure of gate valve for oil well

Abstract

The utility model relates to the technical field of oil well equipment, in particular to a valve plate structure of a gate valve for an oil well, which comprises a gate valve body, a valve cover is arranged at the top of the gate valve body, a valve rod is inserted in the center of the valve cover, and a valve plate driven to open and close by the valve rod is arranged in the gate valve body. Limiting plates of annular structures are arranged on the portions, located on the two sides of the sealing face of the valve plate, in the gate valve body, a plurality of abutting blocks are arranged on the corresponding sides of the limiting plates in a surrounding mode, telescopic pressing columns are arranged on the sides, connected with the limiting plates, of the abutting blocks, and a support is arranged on one side of the valve deck. And a clamping seat for limiting a hand wheel at the top end of the valve rod is arranged at the top end of the bracket. According to the valve plate structure of the gate valve for the oil well, through the design of the limiting plate, the position stability of the valve plate in the working state is enhanced, it is ensured that the sealing performance is continuous and effective, the leakage risk caused by deviation of the valve plate is reduced, and therefore the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well equipment, in particular to a valve plate structure of a gate valve used in an oil well. Background Art

[0002] Gate valves are a very important type of valve equipment in the oil and gas extraction industry, mainly used to control the opening and closing of fluids (such as crude oil and natural gas) in the production process of oil and gas wells. This type of valve is designed to withstand high pressure, corrosion resistance, and wear resistance in harsh working conditions to ensure the safety and efficiency of oil well operations.

[0003] Existing gate valves for oil wells often face the problem of valve plate deviation under the action of high-pressure fluid, resulting in sealing failure, which not only affects production efficiency, but may also cause serious safety accidents, especially in deep wells, high temperature and high pressure environments. This problem is more prominent. Although there are attempts in the prior art to improve the sealing performance by strengthening the valve body or improving the sealing material, the problem of unstable valve plate position has not been fundamentally solved. Utility Model Content

[0004] The utility model aims to provide a valve plate structure for an oil well gate valve, so as to solve the problem that the valve plate of the current oil well gate valve may deviate and fail to seal due to uneven force or external force impact.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a valve plate structure of a gate valve for an oil well, comprising a gate valve body, a valve cover is provided on the top of the gate valve body, a valve stem is inserted in the center of the valve cover, and a valve plate driven to open and close by the valve stem is provided inside the gate valve body, and both sides of the valve plate sealing surface inside the gate valve body are provided with limiting plates of annular structure, a plurality of pressure blocks are arranged around the corresponding side of the limiting plate, and a retractable pressure column is provided on the side where the pressure block is connected to the limit plate, and a bracket is provided on one side of the valve cover, and a clamping seat for limiting the handwheel at the top of the valve stem is provided at the top of the bracket.

[0006] Preferably, a plurality of recessed holes matching the pressure column structure are arranged around the corresponding side of the limit plate, and the inner ends of the recessed holes inside the limit plate are filled with elastic blocks, and the inner ends of the pressure columns extend into the recessed holes of the limit plate and are pressed against the elastic blocks.

[0007] Preferably, a rubber sealing ring is provided at the edge of the concave hole of the limiting plate, and the pressure column is also slidably inserted into the rubber sealing ring.

[0008] Preferably, a waterproof soft cover is provided on the outside of the connection end between the pressure column and the pressure block, and two ends of the waterproof soft cover are respectively connected to the pressure block and one side corresponding to the limiting plate.

[0009] Preferably, a support block is provided on one side of the bottom end of the valve cover, a sleeve is provided at the bottom of the support block, a pull shaft slidably inserted in the sleeve is provided at the bottom end of the bracket, and a tension spring is provided at the outer sleeve of the outer end of the pull shaft.

[0010] Preferably, the bracket is a telescopic structure consisting of an upper bracket and a lower bracket, and an extension rod is provided at the connection between the upper bracket and the lower bracket.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the valve plate structure of the oil well gate valve enhances the position stability of the valve plate in the working state through the design of the limit plate, ensures the continuous effectiveness of the sealing performance, reduces the risk of leakage caused by the deviation of the valve plate, and thus prolongs the service life of the equipment. The valve plate structure of the oil well gate valve is provided with limit plates on both sides of the valve plate sealing surface of the gate valve body, and a plurality of pressure blocks provided on the corresponding side of the limit plate can be extended and retracted through the pressure column and the elastic block to play a role of uniform and flexible pressure on the valve plate in the sealing state, so that the sealing position of the valve plate is more stable, and the deviation of the valve plate caused by external force is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of a valve plate structure of a gate valve for oil wells according to the utility model;

[0013] Figure 2 The utility model is a valve plate structure of a gate valve for oil wells Figure 1 The enlarged structural diagram at A in the middle;

[0014] Figure 3 It is a side view structural schematic diagram of a limit plate of a valve plate structure of a gate valve for oil wells according to the utility model;

[0015] Figure 4 The utility model is a schematic diagram of a support structure of a valve plate structure of a gate valve for oil wells.

[0016] In the figure: 1. gate valve body; 2. valve plate; 3. limit plate; 4. pressure block; 5. valve cover; 6. valve stem; 7. clamping seat; 8. bracket; 9. support block; 91. connecting sleeve; 92. pull shaft; 93. tension spring; 10. pressure column; 11. elastic block; 12. rubber sealing ring; 13. waterproof soft sleeve. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-4The utility model provides a technical solution: a valve plate structure of a gate valve for an oil well, comprising a gate valve body 1, a valve cover 5 is arranged on the top of the gate valve body 1, a valve stem 6 is inserted in the center of the valve cover 5, and a valve plate 2 driven to open and close by the valve stem 6 is arranged inside the gate valve body 1, the valve plate 2 is made of high-strength corrosion-resistant alloy material, and a layer of wear-resistant and corrosion-resistant ceramic coating or high-performance plastic (such as polytetrafluoroethylene) is covered on the surface, and both sides of the sealing surface of the valve plate 2 inside the gate valve body 1 are provided with a limiting plate 3 of an annular structure, the limiting plate 3 is made of high-strength and corrosion-resistant material and is fixed in the gate valve body 1 by bolts or other fastening methods, a plurality of pressing blocks 4 are arranged around the corresponding side of the limiting plate 3, and a side where the pressing block 4 is connected to the limiting plate 3 is provided with a movable The telescopic pressure column 10, the connection between the pressure block 4 and the pressure column 10 is welded and fixed, and a bracket 8 is provided on one side of the valve cover 5, and a clamping seat 7 is welded and fixed on the top of the bracket 8. The clamping seat 7 is provided with a clamping interface that matches the handwheel structure at the top of the valve stem 6. When the gate valve body 1 of this structure drives the valve plate 2 to vertically extend into the internal sealing surface through the valve stem 6, the two side edges of the valve plate 2 will squeeze a number of pressure blocks 4. When the pressure blocks 4 are subjected to force, they will produce a certain degree of expansion and contraction on the side corresponding to the limit plate 3, until the valve plate 2 is pushed to a suitable position to form a seal inside the gate valve body 1, and the several pressure blocks 4 will perform uniform and flexible pressure on both sides of the valve plate 2 to limit the valve plate 2, thereby realizing precise control of the position of the valve plate 2 and ensuring The position stability of the valve plate 2 in the working state ensures the continuous effectiveness of the sealing performance, and solves the problem of the valve plate 2 in the prior art being offset and sealing failure due to uneven force or external force impact. At the same time, one side of the valve cover 5 can be mounted on the side of the handwheel at the top of the valve stem 6 through the mounting bracket 8 to make the clamping seat 7 clamped on the side of the handwheel at the top of the valve stem 6, so as to stabilize the valve stem 6 and prevent the valve stem 6 from rotating due to external force and causing slight displacement of the valve plate 2, further improving the sealing performance and working stability of the valve plate 2 under harsh working conditions. The corresponding side of the limit plate 3 is surrounded by a plurality of concave holes that match the structure of the pressure column 10, and the inner end of the concave hole inside the limit plate 3 is filled with an elastic block 11. The elastic block 11 can be made of soft rubber material, and the inner end of the pressure column 10 extends into the concave hole of the limit plate 3. The pressure column 10 is pressed against the elastic block 11, and the pressure block 4 of this structure will drive the pressure column 10 to extend into the concave hole inside the limiting plate 3 when subjected to the extrusion force of the valve plate 2. When the pressure column 10 extends, it will squeeze the elastic block 11, so as to realize the function of lateral expansion and contraction of the pressure block 4, so as to facilitate the opening and closing of the valve plate 2. A rubber sealing ring 12 is bonded and fixed at the edge of the concave hole of the limiting plate 3, and the pressure column 10 is also slidably inserted into the inside of the rubber sealing ring 12. The rubber sealing ring 12 of this structure can play a good sealing role at the edge of the concave hole of the limiting plate 3 to prevent the medium from flowing into the concave hole of the limiting plate 3, and can also ensure the normal activity of the pressure column 10. The outer sleeve of the connecting end of the pressure column 10 and the pressure block 4 is provided with a waterproof soft sleeve 13, and the waterproof soft sleeve 13 is made of fluororubber.It has excellent oil resistance, high temperature resistance and chemical resistance. The two ends of the waterproof soft cover 13 are respectively bonded and fixed to the corresponding side of the pressure block 4 and the limit plate 3. The pressure column 10 of this structure will simultaneously drive the waterproof soft cover 13 to move when it is extended and retracted, so that the waterproof soft cover 13 can further seal the concave hole of the limit plate 3. A support block 9 is fixed to one side of the bottom end of the valve cover 5 by screws, and a connecting sleeve 91 is welded and fixed to the bottom of the support block 9, and a pull shaft 92 that slides and penetrates inside the connecting sleeve 91 is welded and fixed to the bottom end of the bracket 8, and a tension spring 93 is provided on the outer sleeve of the outer end of the pull shaft 92. The bracket 8 of this structure can be The pull shaft 92 is driven to slide inside the sleeve 91 and the tension spring 93 is activated, so that the bracket 8 can drive the clamping seat 7 to quickly limit or disengage the handwheel at the top of the valve stem 6, making the operation process of stabilizing the handwheel of the valve stem 6 more convenient. The bracket 8 is a telescopic structure composed of an upper bracket and a lower bracket, and an extension rod is provided at the connection between the upper bracket and the lower bracket of the bracket 8. The upper bracket of the bracket 8 of this structure can be pulled to different lengths on the lower bracket through the extension rod and fixed with screws to conveniently adjust the use length of the bracket 8, ensuring that the bracket 8 can drive the clamping seat 7 to stabilize the handwheel at the top of the valve stem 6 raised and lowered to different heights.

[0019] Working principle: When using the valve plate structure of the oil well gate valve, first turn the hand wheel at the top of the valve stem 6 to make the valve plate 2 extend vertically into the sealing surface inside the gate valve body 1. When the valve plate 2 vertically enters the inside of the gate valve body 1, its two side edges will contact a number of pressing blocks 4. When the pressing block 4 is squeezed by the valve plate 2, it will drive the pressure column 10 to extend into the concave hole inside the limit plate 3. When the pressure column 10 extends, it will squeeze the elastic block 11. In this way, the pressing block 4 will produce lateral expansion and contraction. Until the valve plate 2 is pushed to a suitable position to form a seal inside the gate valve body 1, a number of pressing blocks 4 can be flexibly pressed under the elastic force of the elastic block 11. The valve plate 2 is limited on both sides, and the rubber sealing ring 12 and the waterproof soft sleeve 13 can seal the edge of the concave hole of the limiting plate 3. At the same time, the operator can adjust the bracket 8 to a suitable length to align the clamping seat 7 with the handwheel at the top of the valve stem 6, and then pull the bracket 8. When the bracket 8 is subjected to force, it will drive the pulling shaft 92 to slide inside the connecting sleeve 91 and cause the tension spring 93 to move. In this way, the bracket 8 can drive the clamping seat 7 to quickly limit the handwheel at the top of the valve stem 6 under the elastic force of the tension spring 93, so that the valve stem 6 is not easy to loosen when subjected to force, further ensuring the stability of the position of the valve plate 2, thereby completing a series of tasks.

[0020] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve plate structure for a gate valve for an oil well, comprising a gate valve body (1), a valve cover (5) being provided on the top of the gate valve body (1), a valve stem (6) being inserted through the center of the valve cover (5), and a valve plate (2) being provided inside the gate valve body (1) and being driven to open and close by the valve stem (6), characterized in that: The gate valve body (1) is provided with a limiting plate (3) of an annular structure on both sides of the sealing surface of the valve plate (2), and a plurality of pressure blocks (4) are arranged around the corresponding side of the limiting plate (3), and a retractable pressure column (10) is arranged on the side where the pressure block (4) is connected to the limiting plate (3), and a bracket (8) is provided on one side of the valve cover (5), and a clamping seat (7) for limiting the hand wheel at the top of the valve stem (6) is provided at the top of the bracket (8).

2. The valve plate structure of a gate valve for oil wells according to claim 1, characterized in that: A plurality of concave holes matching the structure of the pressure column (10) are arranged around one side corresponding to the limit plate (3), and the inner ends of the concave holes inside the limit plate (3) are filled with elastic blocks (11), and the inner ends of the pressure columns (10) extend into the concave holes of the limit plate (3) and are in pressing contact with the elastic blocks (11).

3. The valve plate structure of a gate valve for oil wells according to claim 2, characterized in that: A rubber sealing ring (12) is provided at the edge of the concave hole of the limiting plate (3), and the pressure column (10) is also slidably inserted into the inside of the rubber sealing ring (12).

4. The valve plate structure of a gate valve for oil wells according to claim 2, characterized in that: The outer sleeve of the connection end between the pressure column (10) and the pressure block (4) is provided with a waterproof soft sleeve (13), and the two ends of the waterproof soft sleeve (13) are respectively connected to the pressure block (4) and the corresponding side of the limit plate (3).

5. The valve plate structure of a gate valve for oil wells according to claim 1, characterized in that: A support block (9) is provided on one side of the bottom end of the valve cover (5), a sleeve (91) is provided at the bottom of the support block (9), and a pull shaft (92) is provided at the bottom end of the bracket (8) and is slidably inserted into the sleeve (91), and a tension spring (93) is provided at the outer sleeve of the outer end of the pull shaft (92).

6. The valve plate structure of a gate valve for oil wells according to claim 1, characterized in that: The bracket (8) is a telescopic structure consisting of an upper bracket and a lower bracket, and an extension rod is provided at the connection between the upper bracket and the lower bracket of the bracket (8).

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