Leak-proof gate valve sealing structure

Abstract

The utility model relates to a sealing structure, in particular to a leakproof gate valve sealing structure. According to the technical scheme, the leakproof gate valve sealing structure comprises a valve body, valve seat rings, a gate plate, a sealing piece, a valve rod and the like, the left side and the right side of the interior of the valve body are communicated, a cylindrical cavity structure is arranged on the upper portion of the valve body, the valve seat rings are symmetrically and fixedly connected to the inner wall of the valve body, and the gate plate is slidably connected between the two valve seat rings. The two side walls of the flashboard are fixedly connected with sealing pieces in an embedded mode, the two side walls of the flashboard and the sealing pieces are all in close contact with the side face of the valve seat ring, the flashboard is located in the valve body, and the top of the flashboard is fixedly connected with a valve rod. The honeycomb holes are formed in the inner wall of the base, the inner surface of the base is subjected to surface modification treatment, a pit structure of 5-20 microns is formed in the inner surface of the base, and meanwhile, the surfaces of the honeycomb holes are subjected to laser texturing treatment, so that impurities can be attached to the top of the base and the interiors of the honeycomb holes more easily, and the effect of effectively adsorbing the impurities is achieved.

Description

Technical Field

[0001] This utility model relates to a sealing structure, and more particularly to a leak-proof gate valve sealing structure. Background Technology

[0002] Gate valves are common industrial valves, primarily used to fully open or close fluid passages. Their main advantages are low fluid resistance and suitability for operation in fully open or fully closed states. They are widely used in petroleum, chemical, power, water supply and drainage, and many other fields. The gate valve sealing structure refers to the design and components used to ensure that the gate valve effectively prevents the flow of media through the valve when closed. The sealing structure is a critical part of gate valve design, directly affecting the valve's sealing performance, service life, and overall reliability.

[0003] Patent CN208397337U discloses a quick-closing gate valve for oilfield gas extraction. This patent allows the gate valve to be opened and closed manually or by a cylinder, making it convenient to operate and use. In addition, a sealing rubber layer is provided on the outside of the gate valve plate, which improves the closing effect and effectively prevents oil and gas leakage. However, this patent still has shortcomings in actual use: during the oilfield gas extraction process, the formation water extracted along with natural gas may contain dissolved minerals, other chemicals, and impurities such as sand particles. The gate valve lacks an effective separation or filtration device, which causes minerals and other particles in the formation water to easily accumulate inside the valve, resulting in partial or complete blockage of the channel and seriously affecting the working performance of the valve.

[0004] Therefore, a leak-proof gate valve sealing structure needs to be designed to solve the above-mentioned technical problems. Utility Model Content

[0005] In order to overcome the shortcomings of the above-mentioned background technology, the present invention provides a leak-proof gate valve sealing structure.

[0006] The technical solution of this utility model is as follows: a leak-proof gate valve sealing structure, including a valve body, a valve seat ring, a gate, a sealing plate, a valve stem, a valve cover, a packing gland, a base, and a sealing ring. The valve body is internally connected on both sides, and a cylindrical cavity structure is provided in the upper part of the valve body. Valve seat rings are symmetrically fixed to the inner wall of the valve body, and a gate is slidably connected between the two valve seat rings. Sealing plates are also embedded and fixed to the two side walls of the gate. The two side walls of the gate and the sealing plates are in close contact with the sides of the valve seat rings. The gate is located inside the valve body. A valve stem is fixed to the top of the valve body, and a valve cover is fixed to the top of the valve body. A packing gland is threadedly connected to the middle of the valve cover. The lower part of the packing gland extends into the interior of the valve body. The valve stem passes through the middle of the packing gland, and its top protrudes from the top of the valve cover. In the initial state, the gate blocks the internal passage of the valve body, and its top surface forms a sealed space with the upper cavity of the valve body. This space is filled with graphite packing. The bottom of the packing gland compacts the graphite packing. A base is fixed to the bottom of the valve body. A sealing ring is fixed to the top of the base. The inner wall of the base has honeycomb holes.

[0007] In one embodiment, the valve cover is further provided with a yoke and upper and lower couplings. The yoke is fixed to the top of the valve cover. The yoke has a hollow interior and the upper and lower couplings are fixed to the top of the yoke. The bottom of the upper and lower couplings is fixed to the top of the valve stem.

[0008] In one embodiment, the device further includes an outer protective cylinder, an inner protective cylinder, a dual-axis hydraulic cylinder, a connecting rod, a spring, and a pressure plate. The outer protective cylinder is fixed to the top of the yoke, and the inner protective cylinder is fixed to the bottom of the outer protective cylinder. The dual-axis hydraulic cylinder is fixed to the top of the inner protective cylinder, and a connecting rod is fixed to the piston at the lower end of the dual-axis hydraulic cylinder. The bottom of the connecting rod passes through the top of the yoke and is fixed to the top of the upper and lower couplings. A spring is fixed to the outer wall of the inner protective cylinder, and a pressure plate is slidably connected to the inner wall of the outer protective cylinder. The pressure plate is always located at the top of the inner protective cylinder, and the outer wall of the pressure plate is in close contact with the inner wall of the outer protective cylinder, and the bottom of the pressure plate is in close contact with the top of the inner protective cylinder.

[0009] In one embodiment, the system further includes an operating lever, a handle, and a sealing shaft. The operating lever is fixedly connected to the piston at the upper end of the dual-axis hydraulic cylinder. The operating lever is threadedly connected to the pressure plate. The top of the operating lever extends through the top of the outer protective cylinder and is fixedly connected to a handle. The upper part of the operating lever is threadedly connected to a sealing shaft, and the bottom of the sealing shaft is in close contact with the top of the outer protective cylinder.

[0010] In one embodiment, the sealing sheet is made of PTFE (polytetrafluoroethylene).

[0011] In one embodiment, the base is made of 17-4PH stainless steel, and the inner surface of the base is modified with a surface modification technique to form 5-20μm pits, and the surface of the honeycomb holes is laser-textured.

[0012] Beneficial effects: 1. This utility model creates honeycomb holes on the inner wall of the base and performs surface modification treatment on the inner surface of the base to form a 5-20μm pit structure on the inner surface of the base. At the same time, laser texturing treatment is performed on the surface of the honeycomb holes so that impurities can more easily adhere to the top of the base and the inside of the honeycomb holes, thereby achieving the effect of effectively adsorbing impurities.

[0013] 2. This utility model activates a dual-shaft hydraulic cylinder, whose lower output shaft drives the connecting rod to retract upwards. The connecting rod drives the gate plate to move upwards through the valve stem, so that the gate plate changes from its initial state (i.e. blocking the left and right channels inside the valve body) to a state that no longer obstructs the flow of fluid, thereby gradually opening the gate valve. During this process, although the gate plate gradually separates from the valve seat ring, the sealing plate still maintains an absolute seal with the valve seat ring, effectively preventing the overflow of fluid inside the valve body. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the valve body, valve seat ring, and gate of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the sealing sheet, valve stem, and valve cover components of this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the valve body, valve seat ring, valve cover, and other components of this utility model.

[0018] Figure 5 This is a three-dimensional structural diagram of the base, sealing ring, and honeycomb holes of this utility model.

[0019] Figure 6 This is a three-dimensional structural diagram of the operating lever handle and sealing shaft of this utility model.

[0020] The components in the diagram are labeled as follows: 1-valve body, 2-valve seat ring, 3-gate, 4-sealing plate, 5-valve stem, 6-valve cover, 7-packing gland, 8-base, 9-sealing ring, 10-honeycomb hole, 11-yoke, 12-upper and lower coupling, 13-outer protective cylinder, 14-inner protective cylinder, 15-dual-shaft hydraulic cylinder, 16-connecting rod, 17-spring, 18-pressure plate, 20-operating lever, 21-handle, 22-sealing shaft. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0022] Example: A leak-proof gate valve sealing structure, such as... Figures 1-5As shown, the valve includes a valve body 1, a valve seat ring 2, a gate 3, a sealing plate 4, a valve stem 5, a valve cover 6, a packing gland 7, a base 8, and a sealing ring 9. The valve body 1 is internally connected on both sides. The upper part of the valve body 1 has a cylindrical cavity structure. The lower inner wall of the valve body 1 is symmetrically welded with valve seat rings 2. The valve seat rings 2 are made of stainless steel, which has strong corrosion resistance and high mechanical strength. A gate 3 is slidably connected between the two valve seat rings 2. The left and right side walls of the gate 3 are also embedded with sealing plates 4 bonded by high-strength epoxy structural adhesive. The sealing plates 4 are made of PTFE (polytetrafluoroethylene), which has excellent chemical corrosion resistance and is suitable for use in environments that handle various corrosive media. The left and right side walls of the gate 3 and the sealing plates 4 are in close contact with the sides of the valve seat rings 2. The gate 3 is located in the middle of the valve body 1. The valve stem 5 is welded to the top of the gate 3. The top of the valve body 1 is connected to the valve cover 6 through a flange. The middle of the valve cover 6 is threadedly connected to the packing gland 7. The lower part of the packing gland 7 extends into... Inside the valve body 1, the valve stem 5 passes through the middle of the packing gland 7, and its top protrudes through the top of the valve cover 6. In the initial state, the gate 3 blocks the left and right channels inside the valve body 1, and its top surface forms a sealed space with the upper cavity of the valve body 1. This space is filled with graphite packing, and the bottom of the packing gland 7 compacts the graphite packing. The bottom of the valve body 1 is connected to the base 8 through a flange. The base 8 is made of 17-4PH stainless steel. The inner surface of the base 8 is treated with surface modification technology, forming 5-20μm pits. A sealing ring 9 is fixed to the top of the base 8. The inner wall of the base 8 has honeycomb holes 10. The surface of the honeycomb holes 10 is laser-textured. Laser texturization can form tiny uneven structures on the surface of the honeycomb holes 10. These structures increase the surface area, making it easier for impurities to adhere to their surface. This helps to reduce the suspension of impurities in the fluid, thereby reducing the risk of contamination to the entire system. The honeycomb holes 10 are regular hexagonal in shape and arranged in an alternating double-layer structure.

[0023] like Figures 1-2 and Figures 5-6As shown, it also includes a yoke 11, upper and lower couplings 12, an outer protective cylinder 13, an inner protective cylinder 14, a dual-shaft hydraulic cylinder 15, a connecting rod 16, a spring 17, a pressure plate 18, an operating lever 20, a handle 21, and a sealing shaft 22. The top of the valve cover 6 is welded with the yoke 11, which has a hollow interior. The top of the yoke 11 is connected to the upper and lower couplings 12 by micro screws. The bottom of the upper and lower couplings 12 is keyed to the top of the valve stem 5. The top of the yoke 11 is connected to the outer protective cylinder 13 by screws. The bottom of the outer protective cylinder 13 is connected to the inner protective cylinder 14 by screws. The top of the inner protective cylinder 14 is fitted with the dual-shaft hydraulic cylinder 15 by screws. The piston at the lower end of the dual-shaft hydraulic cylinder 15 is keyed to the connecting rod 16. 6. The bottom of the connecting rod 16 passes through the top of the yoke 11 and is keyed to the top of the upper and lower couplings 12. A spring 17 is welded to the outer wall of the inner protective cylinder 14. A pressure plate 18 is slidably connected to the inner wall of the outer protective cylinder 13. The pressure plate 18 is always located at the top of the inner protective cylinder 14. The outer wall of the pressure plate 18 is in close contact with the inner wall of the outer protective cylinder 13, and the bottom of the pressure plate 18 is in close contact with the top of the inner protective cylinder 14. An operating rod 20 is keyed to the piston at the upper end of the dual-shaft hydraulic cylinder 15. The operating rod 20 is threadedly connected to the pressure plate 18. A handle 21 is welded to the top of the operating rod 20, which passes through the top of the outer protective cylinder 13. A sealing shaft 22 is threadedly connected to the upper part of the operating rod 20. The bottom of the sealing shaft 22 is in close contact with the top of the outer protective cylinder 13.

[0024] For pipeline installation and use in the petroleum, chemical, and power industries, workers must first ensure a safe connection between the structure and the pipeline. The specific steps are as follows: First, align the left end of the structure with the upstream pipeline opening and use a flange with a sealing ring 9 to tightly connect them, achieving a sealed connection. Then, use the same method to connect the right end of the structure to the downstream pipeline, completing the initial installation. After the structure is installed, if the gate valve needs to be opened, the user activates the dual-shaft hydraulic cylinder 15. At this time, the lower output shaft of the dual-shaft hydraulic cylinder 15 drives the connecting rod 16 to retract upwards. The connecting rod 16, through the valve stem 5, drives the gate plate 3 to move upwards. Simultaneously, the spring 17 and pressure plate 18 gradually reset. As the dual-shaft hydraulic cylinder 15 indirectly drives the gate plate 3 to move to its limit position, the gate plate 3 changes from its initial state (i.e., blocking the left and right channels inside the valve body 1) to a state that no longer obstructs fluid flow, meaning the gate valve gradually opens. During this process, the gate plate 3 gradually disengages from the valve seat ring 2, while the sealing plate 4 maintains an absolute seal with the valve seat ring 2, effectively preventing fluid overflow from inside the valve body 1. Furthermore, in the graphite packing… Under the action of [unclear], the possibility of fluid leakage is further reduced, ensuring that the internal passage of valve body 1 is unobstructed when gate 3 is fully in the raised open state, thereby allowing the upstream pipeline to continuously transport fluid to the downstream pipeline; when it is necessary to close the gate valve, the dual-shaft hydraulic cylinder 15 is activated again, causing its lower piston to drive the connecting rod 16 to extend downward, which in turn drives the gate 3 to move downward through the valve stem 5 until both sides of the gate 3 contact the valve seat ring 2 and remain in a sealed state. At the same time, the upper piston of the dual-shaft hydraulic cylinder 15 drives the operating rod 20 and handle 21 to move downward, causing the pressure plate 18 to slide downward on the operating rod 20 and squeeze the spring 17, causing it to contract. When the gate 3 reaches the limit position, it will completely block the internal passage of valve body 1, blocking the flow of fluid and realizing the valve closing operation; during the up and down movement of gate 3 and valve stem 5, the graphite packing inside valve body 1 is always in an active filling state. Even if there are small gaps between the contact surface of gate 3 and valve seat ring 2, the graphite packing can fill these gaps in time to prevent fluid leakage, ensure the anti-leakage sealing effect, and avoid possible dangers.

[0025] Because the fluid inside the valve body 1 may contain impurities, such as sulfide impurities in crude oil leading to FeS deposition, or soil particles and algae carried by groundwater remaining at the bottom of the valve body 1, the base 8 with the honeycomb aperture gradient interception function, due to the laser roughening of the honeycomb aperture 10 surface, is more susceptible to impurities adhering to its surface and gradually accumulating inside the honeycomb aperture 10. When cleaning the base 8, first use tools to remove the flange between the valve body 1 and the base 8, separate the two, then remove the base 8 and clean the internal impurities. After the base 8 is cleaned, reinstall it at the bottom, ensuring a good seal at the interface. When the dual-axis hydraulic cylinder 15 fails and cannot work, its internal clutch device will be activated, allowing the operating lever 20 to disengage from the upper piston of the dual-axis hydraulic cylinder 15. This allows the operating lever 20 and connecting rod 16 to rotate manually by rotating the handwheel, thereby driving the valve stem 5 and gate 3 to move up and down, realizing the opening or closing of the valve, flexibly responding to the situation of hydraulic cylinder failure.

Claims

1. A leak-proof gate valve sealing structure, characterized in that: The valve body (1) includes a valve body (1), a valve seat ring (2), a gate (3), a sealing plate (4), a valve stem (5), a valve cover (6), a packing gland (7), a base (8), and a sealing ring (9). The valve body (1) is internally connected to the left and right sides. A cylindrical cavity structure is provided on the upper part of the valve body (1). The valve seat rings (2) are symmetrically fixed to the inner wall of the valve body (1). A gate (3) is slidably connected between the two valve seat rings (2). Sealing plates (4) are also embedded and fixed to the two side walls of the gate (3). The two side walls of the gate (3) and the sealing plates (4) are in close contact with the sides of the valve seat rings (2). The gate (3) is located inside the valve body (1). A valve stem (9) is fixed to the top of the gate (3). 5) A valve cover (6) is fixedly connected to the top of the valve body (1). A packing gland (7) is threadedly connected to the middle of the valve cover (6). The lower part of the packing gland (7) extends into the interior of the valve body (1). The valve stem (5) passes through the middle of the packing gland (7) and its top protrudes from the top of the valve cover (6). In the initial state, the gate (3) blocks the internal channel of the valve body (1). Its top surface and the upper cavity of the valve body (1) form a sealed space. The space is filled with graphite packing. The bottom of the packing gland (7) compacts the graphite packing. A base (8) is fixedly connected to the bottom of the valve body (1). A sealing ring (9) is fixedly connected to the top of the base (8). A honeycomb hole (10) is opened on the inner wall of the base (8).

2. The leak-proof gate valve sealing structure as described in claim 1, characterized in that: It also includes a yoke (11) and an upper and lower coupling (12). The top of the valve cover (6) is fixedly connected to the yoke (11). The inside of the yoke (11) is a hollow structure. The top of the yoke (11) is fixedly connected to the upper and lower coupling (12). The bottom of the upper and lower coupling (12) is fixedly connected to the top of the valve stem (5).

3. The leak-proof gate valve sealing structure as described in claim 2, characterized in that: It also includes an outer protective cylinder (13), an inner protective cylinder (14), a dual-shaft hydraulic cylinder (15), a connecting rod (16), a spring (17), and a pressure plate (18). The outer protective cylinder (13) is fixed to the top of the yoke (11), the inner protective cylinder (14) is fixed to the bottom of the outer protective cylinder (13), the dual-shaft hydraulic cylinder (15) is fixed to the top of the inner protective cylinder (14), and the connecting rod (16) is fixed to the piston at the lower end of the dual-shaft hydraulic cylinder (15). The bottom of the connecting rod (16) is inserted into the top of the yoke (11) and fixed to the top of the upper and lower couplings (12). A spring (17) is fixed to the outer wall of the inner protective cylinder (14). A pressure plate (18) is slidably connected to the inner wall of the outer protective cylinder (13). The pressure plate (18) is always located at the top of the inner protective cylinder (14). The outer wall of the pressure plate (18) is in close contact with the inner wall of the outer protective cylinder (13), and the bottom of the pressure plate (18) is in close contact with the top of the inner protective cylinder (14).

4. The leak-proof gate valve sealing structure as described in claim 3, characterized in that: It also includes an operating lever (20), a handle (21) and a sealing shaft (22). The upper piston of the dual-axis hydraulic cylinder (15) is fixedly connected to the operating lever (20). The operating lever (20) is threadedly connected to the pressure plate (18). The top of the operating lever (20) extends out of the top of the outer protective cylinder (13) and is fixedly connected to the handle (21). The upper part of the operating lever (20) is threadedly connected to the sealing shaft (22). The bottom of the sealing shaft (22) is in close contact with the top of the outer protective cylinder (13).

5. The leak-proof gate valve sealing structure as described in claim 4, characterized in that: The sealing sheet (4) is made of PTFE (polytetrafluoroethylene).

6. The leak-proof gate valve sealing structure as described in claim 5, characterized in that: The base (8) is made of 17-4PH stainless steel. The inner surface of the base (8) is modified with surface modification technology, forming 5-20μm pits. The surface of the honeycomb holes (10) is laser-textured.

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