Wellhead gate valve for offshore oil exploitation

Abstract

The invention discloses a wellhead gate valve for offshore oil exploitation, and relates to the field of gate valves, the wellhead gate valve comprises a valve body, a valve plate is clamped on the inner side of the valve body, a sealing structure is arranged in the valve body, a connecting pipe is arranged on the left side of the valve body, and an intercepting assembly is arranged at the top end of the valve body. By arranging the valve seat, the electric push rod, the pressure sensor and the signal amplifier, operation of the pressure sensor is remotely controlled, the pressure on the inner side of the valve seat is detected regularly, and if the pressure value is not within the preset range, the valve plate is abraded, and a gap exists between the valve plate and the valve seat; at the moment, data detected by the pressure sensor are transmitted out through the signal amplifier, the remote client receives and processes signals and then controls an external power source of the electric push rod to be powered on for operation, the electric push rod drives the output end valve seat to move upwards in a small range, and the valve seat can be tightly attached to the valve plate. And adverse effects caused by abrasion of the valve plate are counteracted.

Description

Technical Field

[0001] The invention relates to the field of gate valves, in particular to a wellhead gate valve for offshore oil exploitation. Background Art

[0002] Submarine oil is one of the mineral resources buried in sedimentary rocks and bedrock below the bottom of the ocean. There are rich oil and natural gas resources in the vast seabed. my country has a vast sea area of ​​nearly 4.6 million square kilometers, a long coastline of more than 18,000 kilometers, and a wide shallow continental shelf. The Bohai Sea, the Yellow Sea, the East China Sea and the north and south wings of the South China Sea have large basins with large areas and thick sediments. The reserves of oil and natural gas are huge. my country's offshore oil exploitation has begun to take shape. In offshore oil exploitation, gate valves are important components. The gate valve is a gate plate of an opening and closing part. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface will be welded with metal materials to increase wear resistance, such as cladding 1Cr13, STL6, stainless steel, etc.

[0003] The valve plate of the existing traditional wellhead gate valve is easily worn against the valve seat when opening and closing, and the oil contacts the bottom of the valve plate when flowing, which easily causes wear on the bottom of the valve plate. After the bottom of the valve plate is worn, the sealing performance of the engagement with the valve seat is reduced, resulting in oil leakage when the gate valve is closed. Therefore, a wellhead gate valve for offshore oil exploitation is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to solve the problems that the valve plate of the existing traditional wellhead gate valve is easily worn against the valve seat when opening and closing, and the oil contacts the bottom of the valve plate when flowing, which is easy to cause wear of the bottom of the valve plate, so that the sealing performance of the valve plate engaged with the valve seat is reduced after the bottom of the valve plate is worn, resulting in oil leakage when the gate valve is closed, solid particles in the oil may damage the surface of the valve plate, resulting in failure of the valve plate seal and the hand wheel of the gate valve being exposed to the external environment. Since the gate valve is used in a marine environment, humidity, strong winds, etc. may easily damage the hand wheel, and the gap between the valve stem and the nut may be blocked, affecting the rotation of the valve stem. A wellhead gate valve for marine oil exploitation is provided.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a wellhead gate valve for offshore oil exploitation, comprising a valve body, a valve plate is engaged with the inner side of the valve body, a sealing structure is arranged inside the valve body, a connecting pipe is arranged on the left side of the valve body, an intercepting assembly is arranged on the top of the valve body, and a protective structure is arranged on the inner side of the connecting pipe.

[0006] The sealing structure includes a valve seat, a rubber sheet is connected to the side of the valve seat, a movable block is fixed to the bottom of the valve seat, an adjustment groove is opened on the outside of the valve seat, and a pressure sensor is installed inside the valve seat, a movable sleeve is movably arranged on the outside of the movable block, an electric push rod is arranged on one side of the movable sleeve, and a signal amplifier is installed on one side of the pressure sensor.

[0007] The interception assembly includes a first filter plate, a second filter plate is arranged on one side of the first filter plate, a first liquid inlet groove is opened at the bottom end of the connecting tube, a first liquid outlet groove is opened on one side of the first liquid inlet groove, a second liquid inlet groove is opened on one side of the first liquid outlet groove, and a second liquid outlet groove is opened on one side of the second liquid inlet groove, a collecting box is fixed to the bottom end of the connecting tube, a sealing plate is engaged with the bottom of the collecting box, and an interception net is engaged with the inner wall of the collecting box, a delivery pipe is arranged on one side of the sealing plate, and a mounting block is arranged on the outside of the sealing plate, a first sealing strip is arranged on the side of the sealing plate, a liquid pump is installed on the delivery pipe, and a hose is connected to one end of the delivery pipe.

[0008] The protective structure includes a protective cover, a second sealing strip is arranged at the top of the protective cover, and a sealing cover is movably arranged above the protective cover, a lock buckle is installed on the outer wall of the protective cover, a lifting block is arranged on the outer wall of the sealing cover, and moisture-absorbing cotton is arranged on the inner walls of the sealing cover and the protective cover.

[0009] Preferably, a valve stem is installed at the top of the valve plate, a handwheel is provided at the top of the valve stem, a valve cover is installed at the top of the valve body, a sealing seat is provided at the top of the valve cover, a nut is provided above the sealing seat, flanges are provided at both ends of the valve body and the connecting pipe, and the valve body and the connecting pipe are fixedly installed by flanges and bolts, and the nut and the valve stem are movably connected by threads.

[0010] Preferably, the valve seat and the adjusting groove are movably connected via a rubber sheet, and the rubber sheet, the valve seat and the adjusting groove are fixedly connected via glue, a limiting block is provided on the outer wall of the movable block, a limiting groove is provided on the inner wall of the movable sleeve, and the movable block and the movable sleeve are movably connected via the limiting block and the limiting groove.

[0011] Preferably, the number of the movable blocks and movable sleeves is two, the output end of the electric push rod is fixedly connected to the valve seat, and the electric push rod and the valve body are fixedly installed through a mounting frame, and the pressure sensor is electrically connected to the signal amplifier.

[0012] Preferably, the first filter plate and the second filter plate are fixed on the inner wall of the connecting pipe, and the first liquid inlet groove, the first liquid outlet groove, the second liquid inlet groove and the second liquid outlet groove penetrate to the bottom of the connecting pipe.

[0013] Preferably, the filter aperture of the first liquid outlet trough is larger than that of the second liquid outlet trough, and the filter aperture of the first liquid outlet trough is the same as that of the interception net. The collecting box is welded to the outer wall of the connecting pipe, and the sealing plate and the collecting box are sealed and installed by means of a first sealing strip, a mounting block and bolts.

[0014] Preferably, the liquid pump penetrates into the inner side of the collecting box, one end of the hose penetrates into the inner side of the valve body, and a sealing ring is provided between the hose and the valve body.

[0015] Preferably, the protective cover is movably connected to the sealing cover via a hinge, and the protective cover is fixedly connected to the sealing cover via a lock snap engagement, and the protective cover is fixed to the top of the valve body.

[0016] Preferably, the second sealing strip is fixedly connected to the protective cover by glue, and the moisture-absorbing cotton is fixedly connected to the protective cover and the sealing cover.

[0017] Compared with the prior art, the present invention has the following beneficial effects: First, the present invention remotely controls the operation of the pressure sensor by setting a valve seat, an electric push rod, a pressure sensor and a signal amplifier, and regularly detects the pressure inside the valve seat. If the pressure value is not within a predetermined range, it means that the valve plate is worn and a gap appears between the valve plate and the valve seat. At this time, the data detected by the pressure sensor is transmitted through the signal amplifier, and the remote client receives the signal, processes the signal, and controls the electric push rod to be powered on by an external power supply. The electric push rod drives the output end valve seat to move up slightly, so that the valve seat can fit tightly with the valve plate. After the valve plate is worn, the position of the valve seat can be adjusted to offset the adverse effects of the wear of the valve plate.

[0018] Second, the present invention provides a first filter plate, a second filter plate, a collecting box, a first liquid inlet tank, a second liquid inlet tank and an intercepting net. Driven by suction, the oil flows smoothly in the pipeline and the connecting pipe, and the impurities mixed therein are intercepted by the first filter plate and the second filter plate with different apertures. A small part of the unfiltered oil enters the collecting box through the first liquid inlet tank, but still flows out after being filtered through the first liquid outlet tank under the action of suction and thrust, and flows out after being filtered for the first time through the intercepting net and the second time through the second liquid outlet tank. Some of the oil is filtered by the first filter plate, falls through the second liquid inlet tank, enters the collecting box, and then is filtered out through the second liquid outlet tank. No matter how the oil flows, it will be filtered and processed before entering the gate valve, thereby preventing large particles of impurities from entering the valve body and causing impact and wear on the valve plate.

[0019] Third, the present invention provides a protective cover, a sealing cover, a second sealing strip and moisture-absorbing cotton. After the gate valve is adjusted, the sealing cover can be pulled by the lifting block to rotate through the hinge to fit with the protective cover, and then the lock buckle on the outer wall of the protective cover is engaged and fixed with the seat on the outer wall of the sealing cover, so that the sealing cover and the protective cover are tightly fixed through the second sealing strip, and the protective cover and the sealing cover are wrapped around the outside of the valve body, the sealing seat, the nut and the handwheel to protect them from erosion by strong wind and rain, and the moisture-absorbing cotton on the inner wall of the protective cover and the sealing cover absorbs a small part of the infiltrated moisture to reduce the influence of moisture on the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the front cross-section structure of the present invention; Figure 3 It is a schematic diagram of the sealing structure of the present invention; Figure 4 For the present invention Figure 3 A is an enlarged schematic diagram; Figure 5 It is a schematic diagram of the rubber sheet of the present invention; Figure 6 It is a schematic diagram of the interception component of the present invention; Figure 7 It is a schematic diagram of the oil flow of the present invention; Figure 8 It is a schematic diagram of the first liquid outlet tank of the present invention; Fig. 9 It is a schematic diagram of a sealing plate of the present invention; Fig.10 A schematic diagram of a protective cover according to the present invention; Fig.11 It is a schematic diagram of the moisture-absorbing cotton of the present invention.

[0021] In the figure: 1, valve body; 2, valve plate; 3, sealing structure; 301, valve seat; 302, rubber sheet; 303, adjusting groove; 304, movable block; 305, movable sleeve; 306, electric push rod; 307, pressure sensor; 308, signal amplifier; 4, valve stem; 5, valve cover; 6, sealing seat; 7, nut; 8, hand wheel; 9, connecting pipe; 10, flange; 11, interception assembly; 1101, first filter plate; 1102, first liquid inlet tank; 1103, first liquid outlet tank; 1104, second liquid inlet trough; 1105, second filter plate; 1106, second liquid outlet trough; 1107, collecting box; 1108, sealing plate; 1109, mounting block; 1110, first sealing strip; 1111, delivery pipe; 1112, liquid suction pump; 1113, hose; 1114, intercepting net; 12, protective structure; 1201, protective cover; 1202, sealing cover; 1203, second sealing strip; 1204, locking buckle; 1205, lifting block; 1206, moisture-absorbing cotton. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 5A wellhead gate valve for offshore oil production comprises a valve body 1, a valve plate 2 is engaged with the inner side of the valve body 1, a sealing structure 3 is arranged inside the valve body 1, a connecting pipe 9 is arranged on the left side of the valve body 1, an interception component 11 is arranged at the top of the valve body 1, a protective structure 12 is arranged on the inner side of the connecting pipe 9, the sealing structure 3 comprises a valve seat 301, a rubber sheet 302 is connected to the side of the valve seat 301, a movable block 304 is fixed to the bottom end of the valve seat 301, an adjusting groove 303 is opened on the outer side of the valve seat 301, a pressure sensor 307 is installed inside the valve seat 301, a movable sleeve 305 is movably arranged on the outer side of the movable block 304, an electric push rod 306 is arranged on one side of the movable sleeve 305, and a signal amplifier is installed on one side of the pressure sensor 307. The valve plate 2 is provided with a valve stem 4 at the top, a hand wheel 8 is provided at the top of the valve stem 4, a valve cover 5 is provided at the top of the valve body 1, a sealing seat 6 is provided at the top of the valve cover 5, a nut 7 is provided above the sealing seat 6, flanges 10 are provided at both ends of the valve body 1 and the connecting pipe 9, and the valve body 1 and the connecting pipe 9 are fixedly installed by the flange 10 and bolts, the nut 7 and the valve stem 4 are movably connected by threads, the valve seat 301 and the adjusting groove 303 are movably connected by the rubber sheet 302, and the rubber sheet 302 and the valve seat 301 and the adjusting groove 303 are fixedly connected by glue, the outer wall of the movable block 304 is provided with a limiting block, the inner wall of the movable sleeve 305 is provided with a limiting groove, and the movable block 304 and the movable sleeve 305 are movably connected by the limiting block and the limiting groove, and the movable There are two movable blocks 304 and movable sleeves 305. The output end of the electric push rod 306 is fixedly connected to the valve seat 301, and the electric push rod 306 is fixedly installed with the valve body 1 through a mounting frame. The pressure sensor 307 is electrically connected to the signal amplifier 308. By turning the hand wheel 8, the valve stem 4 is rotated on the inner side of the nut 7. When the valve stem 4 rotates, it drives the valve plate 2 to move up and down. The valve plate 2 is constantly engaged with the valve seat 301. The operation of the remotely controlled pressure sensor 307 is periodically tested for the pressure inside the valve seat 301. If the pressure value is within a predetermined range, the valve plate 2 is still tightly engaged with the valve seat 301. If the pressure value is not within the predetermined range, it means that the valve plate 2 is worn and a gap appears between the valve plate 2 and the valve seat 301. At this time, the pressure sensor The data detected by 307 is transmitted through the signal amplifier 308, and the remote client receives the signal. After processing the signal, the electric push rod 306 is controlled to be powered on by the external power supply. The internal technology of the electric push rod 306 is the existing technology. The electric push rod 306 drives the output end valve seat 301 to move up slightly, so that the valve seat 301 can fit tightly with the valve plate 2. After the valve plate 2 is worn, the position of the valve seat 301 can be adjusted to offset the adverse effects of the wear of the valve plate 2. At the same time, when the valve seat 301 moves up, the movable block 304 at its bottom moves in the movable sleeve 305 to provide support for its smooth upward movement. After the valve seat 301 moves, the rubber sheet 302 on the side of the valve seat 301 always blocks the gap between the valve seat 301 and the adjusting groove 303.Prevent oil from penetrating under the valve seat 301.

[0024] See also Figure 6-Figure 9A wellhead gate valve for offshore oil production, the interception component 11 includes a first filter plate 1101, a second filter plate 1105 is arranged on one side of the first filter plate 1101, a first liquid inlet trough 1102 is arranged on the bottom end of the connecting pipe 9, a first liquid outlet trough 1103 is arranged on one side of the first liquid inlet trough 1102, a second liquid inlet trough 1104 is arranged on one side of the first liquid outlet trough 1103, a second liquid outlet trough 1106 is arranged on one side of the second liquid inlet trough 1104, a collecting box 1107 is fixed to the bottom end of the connecting pipe 9, a sealing plate 1108 is clamped on the bottom of the collecting box 1107, and an interception net 1114 is clamped on the inner wall of the collecting box 1107, a delivery pipe 1111 is arranged on one side of the sealing plate 1108, and the outer wall of the sealing plate 1108 is provided with a sealing plate 1108. A mounting block 1109 is provided, a first sealing strip 1110 is provided on the side of the sealing plate 1108, a liquid pump 1112 is installed on the delivery pipe 1111, and one end of the delivery pipe 1111 is connected to a hose 1113, a first filter plate 1101 and a second filter plate 1105 are fixed on the inner wall of the connecting pipe 9, a first liquid inlet trough 1102, a first liquid outlet trough 1103, a second liquid inlet trough 1104 and a second liquid outlet trough 1106 are penetrated to the bottom of the connecting pipe 9, a filtering aperture of the first liquid outlet trough 1103 is larger than that of the second liquid outlet trough 1106, and the first liquid outlet trough 1103 has the same filtering aperture as the intercepting net 1114, a collecting box 1107 is welded to the outer wall of the connecting pipe 9, and the sealing plate 1108 and the collecting box 1107 are connected by the first sealing strip 1113. 110, mounting block 1109 and bolt sealing installation, the liquid pump 1112 penetrates the inner side of the collection box 1107, one end of the hose 1113 penetrates the inner side of the valve body 1, and a sealing ring is arranged between the hose 1113 and the valve body 1, and the connecting pipe 9 is fixedly connected to the valve body 1 of the gate valve through the flange 10 and bolts. In the process of offshore oil extraction, the oil first flows through the connecting pipe 9 and then enters the inside of the gate valve. Driven by suction, the oil flows smoothly in the pipeline and the connecting pipe 9, and the impurities mixed therein are intercepted by the first filter plate 1101 and the second filter plate 1105 with different apertures, and a small part of the unfiltered oil enters the collection box 1107 through the first liquid inlet groove 1102, but still under the action of suction and thrust, it passes through The oil flows out after being filtered in the first liquid outlet 1103, and flows out after being filtered for the first time through the interception net 1114 and for the second time through the second liquid outlet 1106. Some of the oil flows out after being filtered by the first filter plate 1101, falls through the second liquid inlet 1104, and enters the collection box 1107, and then flows out through the second liquid outlet 1106. No matter how the oil flows, it will be filtered and processed before entering the gate valve, thereby preventing large particles of impurities from entering the valve body 1 and causing impact wear on the valve plate 2. After the oil in the connecting pipe 9 is completely exhausted, the liquid pump 1112 on the delivery pipe 1111 is controlled to operate, so that the oil accumulated in the collection box 1107 flows into the valve body 1 through the delivery pipe 1111 and the hose 1113.After the oil in the collecting box 1107 is cleaned, the sealing plate 1108 can be opened to remove the impurities and clean them.

[0025] See also Figure 10-11 , a wellhead gate valve for offshore oil production, the protective structure 12 includes a protective cover 1201, a second sealing strip 1203 is arranged on the top of the protective cover 1201, and a sealing cover 1202 is movably arranged above the protective cover 1201, a lock buckle 1204 is installed on the outer wall of the protective cover 1201, a lifting block 1205 is arranged on the outer wall of the sealing cover 1202, and the inner walls of the sealing cover 1202 and the protective cover 1201 are both provided with moisture-absorbing cotton 1206, the protective cover 1201 and the sealing cover 1202 are movably connected by hinges, and the protective cover 1201 and the sealing cover 1202 are fixedly connected by the lock buckle 1204, the protective cover 1201 is fixed to the top of the valve body 1, the second sealing strip 1203 and the protective cover 1201 are fixedly connected by glue, and the moisture-absorbing cotton 1206 is arranged on the inner walls of the sealing cover 1202 and the protective cover 1201. The cotton 1206 is fixedly connected to the protective cover 1201 and the sealing cover 1202. After the gate valve is adjusted, the sealing cover 1202 can be pulled by the lifting block 1205 to rotate through the hinge to fit with the protective cover 1201, and then the lock buckle 1204 on the outer wall of the protective cover 1201 is engaged and fixed with the seat on the outer wall of the sealing cover 1202, so that the sealing cover 1202 and the protective cover 1201 are tightly fixed through the second sealing strip 1203, and the protective cover 1201 and the sealing cover 1202 are wrapped around the outside of the valve body 1, the sealing seat 6, the nut 7 and the hand wheel 8 to protect them from erosion by strong wind and rain, and the moisture-absorbing cotton 1206 on the inner wall of the protective cover 1201 and the sealing cover 1202 absorbs a small part of the infiltrated moisture to reduce the influence of moisture on the gate valve.

[0026] Working principle: When the present invention is used, the hand wheel 8 is turned to rotate the valve stem 4 inside the nut 7. When the valve stem 4 rotates, it drives the valve plate 2 to move up and down. The valve plate 2 is constantly engaged with the valve seat 301, thereby controlling the flow of oil. The remote control pressure sensor 307 is operated to regularly detect the pressure inside the valve seat 301. If the pressure value is within the predetermined range, the valve plate 2 and the valve seat 301 are still tightly engaged. If the pressure value is not within the predetermined range, it means that the valve plate 2 is worn and a gap appears between the valve plate 2 and the valve seat 301. At this time, the data detected by the pressure sensor 307 is transmitted through the signal amplifier 308, and the remote client receives the signal. After processing the signal, the control The electric push rod 306 is powered on by an external power supply, and the internal technology of the electric push rod 306 is the existing technology. The electric push rod 306 drives the output end valve seat 301 to move up slightly, so that the valve seat 301 can fit tightly with the valve plate 2. After the valve plate 2 is worn, the position of the valve seat 301 can be adjusted to offset the adverse effects of the wear of the valve plate 2. The connecting pipe 9 is fixedly connected to the valve body 1 of the gate valve through the flange 10 and bolts. During the offshore oil production process, the oil first flows through the connecting pipe 9 and then enters the inside of the gate valve. Driven by suction, the oil flows smoothly in the pipeline and the connecting pipe 9, and the impurities mixed therein are intercepted by the first filter plate 1101 and the second filter plate 1105 with different apertures. The oil flows down, and a small part of the unfiltered oil enters the collection box 1107 through the first liquid inlet groove 1102, but still flows out after being filtered through the first liquid outlet groove 1103 under the action of suction and thrust, and flows out after being filtered for the first time through the interception net 1114 and the second time through the second liquid outlet groove 1106. In addition, some oil is filtered by the first filter plate 1101, falls through the second liquid inlet groove 1104, enters the collection box 1107, and then flows out through the second liquid outlet groove 1106. No matter how the oil flows, it will be filtered and processed before entering the gate valve, thereby preventing large particles of impurities from entering the valve body 1 and causing impact wear on the valve plate 2. After the gate valve is adjusted, the sealing cover 1202 can be pulled by the lifting block 1205 to rotate through the hinge to fit with the protective cover 1201, and then the lock buckle 1204 on the outer wall of the protective cover 1201 is engaged and fixed with the seat on the outer wall of the sealing cover 1202, so that the sealing cover 1202 and the protective cover 1201 are tightly fixed through the second sealing strip 1203, and the protective cover 1201 and the sealing cover 1202 are wrapped around the outside of the valve body 1, the sealing seat 6, the nut 7 and the hand wheel 8 to protect them from erosion by strong wind and rain, and the moisture-absorbing cotton 1206 on the inner wall of the protective cover 1201 and the sealing cover 1202 absorbs a small part of the infiltrated moisture to reduce the influence of moisture on the gate valve.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A wellhead gate valve for offshore oil production, comprising a valve body (1), characterized in that: A valve plate (2) is engaged with the inner side of the valve body (1), and a sealing structure (3) is provided inside the valve body (1); a connecting pipe (9) is provided on the left side of the valve body (1), and an intercepting assembly (11) is provided at the top end of the valve body (1); and a protective structure (12) is provided on the inner side of the connecting pipe (9); The sealing structure (3) comprises a valve seat (301), a rubber sheet (302) is connected to the side of the valve seat (301), a movable block (304) is fixed to the bottom end of the valve seat (301), an adjustment groove (303) is provided on the outside of the valve seat (301), a pressure sensor (307) is installed inside the valve seat (301), a movable sleeve (305) is movably provided on the outside of the movable block (304), an electric push rod (306) is provided on one side of the movable sleeve (305), and a signal amplifier (308) is installed on one side of the pressure sensor (307); The interception assembly (11) comprises a first filter plate (1101), a second filter plate (1105) is arranged on one side of the first filter plate (1101), a first liquid inlet groove (1102) is provided at the bottom end of the connecting tube (9), a first liquid outlet groove (1103) is provided at one side of the first liquid inlet groove (1102), a second liquid inlet groove (1104) is provided at one side of the first liquid outlet groove (1103), a second liquid outlet groove (1106) is provided at one side of the second liquid inlet groove (1104), and a collecting box is fixed at the bottom end of the connecting tube (9). (1107), a sealing plate (1108) is engaged at the bottom of the collecting box (1107), and an intercepting net (1114) is engaged at the inner wall of the collecting box (1107), a delivery pipe (1111) is provided on one side of the sealing plate (1108), and a mounting block (1109) is provided on the outside of the sealing plate (1108), a first sealing strip (1110) is provided on the side of the sealing plate (1108), a liquid extraction pump (1112) is installed on the delivery pipe (1111), and one end of the delivery pipe (1111) is connected to a hose (1113); The protective structure (12) comprises a protective cover (1201), a second sealing strip (1203) is arranged at the top of the protective cover (1201), and a sealing cover (1202) is movably arranged above the protective cover (1201), a locking buckle (1204) is installed on the outer wall of the protective cover (1201), a lifting block (1205) is arranged on the outer wall of the sealing cover (1202), and moisture-absorbing cotton (1206) is arranged on the inner walls of the sealing cover (1202) and the protective cover (1201).

2. A wellhead gate valve for offshore oil production according to claim 1, characterized in that: A valve stem (4) is mounted on the top of the valve plate (2), a hand wheel (8) is arranged on the top of the valve stem (4), a valve cover (5) is mounted on the top of the valve body (1), a sealing seat (6) is arranged on the top of the valve cover (5), a nut (7) is arranged above the sealing seat (6), flanges (10) are arranged at both ends of the valve body (1) and the connecting pipe (9), and the valve body (1) and the connecting pipe (9) are fixedly mounted by means of the flange (10) and bolts, and the nut (7) and the valve stem (4) are movably connected by means of threads.

3. The wellhead gate valve for offshore oil production according to claim 1, characterized in that: The valve seat (301) and the adjusting groove (303) are movably connected via a rubber sheet (302), and the rubber sheet (302), the valve seat (301) and the adjusting groove (303) are fixedly connected via glue; a limit block is provided on the outer wall of the movable block (304); a limit groove is provided on the inner wall of the movable sleeve (305); and the movable block (304) and the movable sleeve (305) are movably connected via the limit block and the limit groove.

4. A wellhead gate valve for offshore oil production according to claim 1, characterized in that: The movable block (304) and the movable sleeve (305) are provided in two pieces, the output end of the electric push rod (306) is fixedly connected to the valve seat (301), and the electric push rod (306) and the valve body (1) are fixedly mounted via a mounting frame, and the pressure sensor (307) is electrically connected to the signal amplifier (308).

5. The wellhead gate valve for offshore oil production according to claim 1, characterized in that: The first filter plate (1101) and the second filter plate (1105) are fixed to the inner wall of the connecting tube (9), and the first liquid inlet groove (1102), the first liquid outlet groove (1103), the second liquid inlet groove (1104) and the second liquid outlet groove (1106) extend through the bottom of the connecting tube (9).

6. A wellhead gate valve for offshore oil production according to claim 1, characterized in that: The filtering aperture of the first liquid outlet trough (1103) is larger than that of the second liquid outlet trough (1106), and the filtering aperture of the first liquid outlet trough (1103) is the same as that of the interception net (1114); the collecting box (1107) is welded to the outer wall of the connecting pipe (9), and the sealing plate (1108) and the collecting box (1107) are sealed and installed via a first sealing strip (1110), a mounting block (1109), and bolts.

7. The wellhead gate valve for offshore oil production according to claim 1, characterized in that: The liquid pump (1112) penetrates the inner side of the collection box (1107), one end of the hose (1113) penetrates the inner side of the valve body (1), and a sealing ring is provided between the hose (1113) and the valve body (1).

8. The wellhead gate valve for offshore oil production according to claim 1, characterized in that: The protective cover (1201) and the sealing cover (1202) are movably connected via a hinge, and the protective cover (1201) and the sealing cover (1202) are fixedly connected via a lock (1204), and the protective cover (1201) is fixed to the top of the valve body (1).

9. A wellhead gate valve for offshore oil production according to claim 1, characterized in that: The second sealing strip (1203) is fixedly connected to the protective cover (1201) by glue, and the moisture-absorbing cotton (1206) is fixedly connected to the protective cover (1201) and the sealing cover (1202).

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