Fracturing gate valve with sand scraping function for fracturing wellhead device

Abstract

The application relates to the technical field of fracturing gate valves, and discloses a fracturing gate valve with sand scraping function for a fracturing wellhead device, which comprises a valve seat and a valve body, the valve seat is fixed to the top of the valve body, the inside of the valve body is provided with a valve plate and a buffer cavity, the buffer cavity is arranged in the inside of the valve body, and the valve plate is arranged in the inside of the buffer cavity; a sand cleaning system and a sand scraping part, the sand cleaning system and the sand scraping part are arranged in the inside of the valve body, the sand cleaning system is used for cleaning and brushing the sand particles deposited in the cavity of the valve body, and the sand scraping part is arranged on the two side faces of the valve plate. The fracturing gate valve can not only realize the double cleaning of source interception and surface scraping of the sand particles in the closing process of the gate valve through the cooperation of the sand cleaning system and the sand scraping part, but also can realize the detection of the filter plate blockage state and the high-pressure directional back-flushing unblocking through the cooperation of the flushing part and the pressure transmitter, and can solve the problem that the sand deposited at the bottom of the buffer cavity is difficult to discharge through the arrangement of the bottom sand discharging part.

Description

Technical Field

[0001] This invention relates to the field of fracturing gate valve technology, specifically to a fracturing gate valve with sand-scraping function for fracturing wellhead equipment. Background Technology

[0002] In the development of unconventional oil and gas resources, the commercial exploitation of reservoirs such as tight oil mainly relies on large-scale hydraulic fracturing technology. With the continuous evolution of fracturing processes, operational parameters have become increasingly stringent, specifically manifested in a sustained increase in the proppant concentration carried by the fracturing fluid and a significant increase in the amount of proppant injected per stage. Simultaneously, during the flowback phase after fracturing operations, the downhole flowback fluid still carries a large amount of un-anchored proppant particles and fine formation sand detached from formation pores.

[0003] During the fracturing operation cycle, the gate valve needs to be opened and closed frequently. Since the valve cavity is filled with sand-containing fluid, sand particles are easily adhered to the surface of the gate during the reciprocating lifting and lowering process. When the gate moves, the adhered sand particles are forcibly carried into the sliding fit gap between the valve plate and the valve disc, resulting in excessive wear of the sealing pair. This leads to faults such as incomplete closure of the gate valve and internal leakage and pressure surge, which seriously affect the operational safety of the fracturing wellhead and the service life of the gate valve. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a fracturing gate valve with a sand-scraping function for fracturing wellhead equipment. The main purpose is to solve the problem that when the valve cavity is filled with sand-laden fluid, sand particles easily adhere to the surface of the gate during its reciprocating motion. When the gate moves, these adhered sand particles are forcibly carried into the sliding fit gap between the valve plate and the valve disc, leading to excessive wear of the sealing pair. This, in turn, causes faults such as incomplete gate valve closure and internal leakage, seriously affecting the operational safety of the fracturing wellhead and the service life of the gate valve.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A fracturing gate valve with sand-scraping function for fracturing wellhead equipment includes: The valve seat and valve body are provided. The valve seat is fixed to the top of the valve body. The valve body is provided with a valve plate and a buffer chamber. The buffer chamber is opened inside the valve body and the valve plate is located inside the buffer chamber. The sand cleaning system and the sand scraping component are both located inside the valve body. The sand cleaning system is used to clean the sand particles that settle inside the valve body cavity. The sand scraping component is located on both sides of the valve plate. The sand scraping component scrapes the sand on the surface of the valve plate synchronously with the opening and closing action of the valve plate. The sand removal system includes: The rotating frame is rotatably connected to the main flow chamber of the valve body. A filter plate is fixedly connected inside the rotating frame. After the filter plate rotates to a vertical position, it is used to filter the fluid flowing through the main flow chamber of the valve body.

[0006] Furthermore, the sand removal system also includes: The self-locking geared motor is fixedly connected to the outer wall of one side of the valve body, and is used to drive the rotating frame to rotate along the axis. The filter plate has a raised structure, and a sealing ring is fixedly connected to the outer side of the rotating frame. The flushing component is located on the top outer wall of the valve body and is situated on the side of the filter plate away from the valve plate. It is used for flushing the filter plate. The bottom sand discharge component is located on the bottom outer wall of the valve body and is connected to the buffer chamber. It is used to discharge the sand particles deposited at the bottom of the buffer chamber.

[0007] Based on the aforementioned solution, the flushing components include: The liquid storage cylinder is fixedly connected to the top outer wall of the valve body. The outer side of the liquid outlet cylinder is fixedly connected to the liquid outlet pipe and the liquid inlet pipe, which are connected to the liquid storage cylinder. Both the liquid outlet pipe and the liquid inlet pipe are equipped with one-way valves. Two liquid guide holes are provided, both of which are located on the top inner wall of the valve body. The two liquid guide holes are used to connect the valve body to the liquid outlet pipe and the liquid inlet pipe, respectively. The first liquid guide cover and the filter component are both fixedly connected to the top inner wall of the valve body. The first liquid guide cover covers one end of the liquid guide hole connected to the liquid outlet pipe and faces the filter plate. The filter component is located at the liquid guide hole connected to the liquid inlet pipe. A piston block is slidably connected to the inside of the liquid storage cylinder. A second hydraulic cylinder is fixedly connected to the top outer wall of the liquid storage cylinder, and the telescopic end of the second hydraulic cylinder passes through the liquid storage cylinder and is fixed to the piston block.

[0008] As a further embodiment of the present invention, the filter component includes a second liquid guide cover fixedly connected to the inner wall of the top of the main flow cavity of the valve body, and the second liquid guide cover is inclined in the direction away from the valve plate. The bottom of the second liquid guide cover has a plurality of equally spaced through holes, and the bottom of the second liquid guide cover is fixedly connected to a plurality of baffles. The baffles have a one-sided opening structure, and the opening end faces the valve plate, and the baffles cover the through holes.

[0009] Furthermore, the bottom sand discharge component includes a sand discharge pipe, which is fixedly connected to the bottom outer wall of the valve body, and the top of the sand discharge pipe is connected to the inside of the buffer chamber. A solenoid valve is installed on the sand discharge pipe.

[0010] Based on the aforementioned solution, the sand-scraping component includes: Two scrapers are respectively set on both sides of the valve plate to scrape off the sand particles attached to the inside of the valve plate. Two limiting blocks are fixedly connected to the top of the valve plate, and the opposite sides of the two limiting blocks are flush with the two sides of the valve plate. Multiple through slots are evenly opened on both sides of the valve body. A sliding rod is slidably connected in the through slot, and the sliding rod is fixed to the scraper. The plug and spring are connected in a threaded connection to the end of the through groove away from the slide rod. The spring is located inside the through groove, and its two ends contact the plug and the slide rod respectively.

[0011] As a further embodiment of the present invention, two valve discs are installed in the main flow cavity of the valve body. The two valve discs are located on both sides of the valve plate, and recesses are provided on both sides of the valve plate.

[0012] Furthermore, a valve stem is fixedly connected to the top of the valve plate, and the bottom end of the valve stem passes through the valve seat. A first hydraulic cylinder is fixedly connected to the top of the valve seat, and the first hydraulic cylinder is used to drive the valve stem to move.

[0013] Based on the aforementioned scheme, a pressure transmitter is fixedly connected to one side of the outer wall of the valve body, and one end of the pressure transmitter passes through the valve body and is inserted into the valve body, with the pressure transmitter located between the filter plate and the valve plate.

[0014] As a further embodiment of the present invention, a spoke-type pressure sensor is fixedly connected to the top of the valve stem, and the detection end of the spoke-type pressure sensor is fixed to the extension end of the first hydraulic cylinder.

[0015] Compared with the prior art, the present invention provides a fracturing gate valve with sand-scraping function for fracturing wellhead equipment, which has the following beneficial effects: 1. This invention achieves dual cleaning of sand particles during the gate valve closing process by coordinating the sand removal system and the sand scraping component, thereby effectively preventing sand particles from being forcibly carried into the sealing gap between the valve plate and the valve disc. This fundamentally solves the problem of internal leakage and pressure leakage caused by abnormal wear of the sealing pair, and significantly improves the safety of fracturing operations and the service life of the gate valve.

[0016] 2. This invention uses a flushing component in conjunction with a pressure transmitter to detect the blockage status of the filter plate and perform high-pressure directional backflushing to clear the blockage, ensuring that the filter plate always has a stable filtration and interception capability.

[0017] 3. By setting up a bottom sand discharge component, the present invention solves the problem of sand accumulation at the bottom of the buffer chamber being difficult to discharge, thus ensuring the cleanliness of the fluid inside the buffer chamber.

[0018] 4. The present invention improves the natural sliding effect of sand particles on the filter plate surface by using raised filter plates, reduces the probability of sand accumulation and blockage in the central area of ​​the filter plate, maintains the normal flow capacity of fluid, and makes it easier for fluid to flush away residual sand particles when the filter plate is in a horizontal state, ensuring that there is no residue accumulation on the surface of the filter plate.

[0019] 5. This invention uses a spoke-type pressure sensor to monitor the downward resistance of the valve stem in real time. When the valve stem resistance exceeds a preset threshold, it is determined that there is still sand accumulation on the valve plate surface. The downward movement of the valve plate is paused and it is raised to continue flushing, effectively preventing damage to the sealing surface or valve stem jamming caused by forced closure due to unremoved sand. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a fracturing gate valve with sand-scraping function for a fracturing wellhead device proposed in this invention; Figure 2 This is a schematic cross-sectional view of the valve body of a fracturing gate valve with sand-scraping function for a fracturing wellhead device proposed in this invention. Figure 3 This is a schematic diagram of the flushing component and sand-removing system of a fracturing gate valve with sand-scraping function for a fracturing wellhead device proposed in this invention. Figure 4 This is a schematic diagram of the filter component structure of a fracturing gate valve with sand-scraping function for a fracturing wellhead device proposed in this invention; Figure 5 This is a schematic diagram of the vertical structure of the filter plate of a fracturing gate valve with sand-scraping function for a fracturing wellhead device proposed in this invention. Figure 6 This is a schematic diagram of the sand-scraping component of a fracturing gate valve with sand-scraping function for a fracturing wellhead device proposed in this invention. Figure 7 This invention proposes a fracturing gate valve with sand-scraping function for fracturing wellhead equipment. Figure 2 A cross-sectional schematic diagram; Figure 8 This is a schematic diagram of the conical filter plate structure of a fracturing gate valve with sand-scraping function for a fracturing wellhead device proposed in this invention. Figure 9 This is a schematic diagram of the centrally protruding disc-shaped filter plate structure of a fracturing gate valve with sand-scraping function for a fracturing wellhead device proposed in this invention.

[0021] In the diagram: 1. Valve seat; 2. Valve body; 3. Flushing component; 4. Sand scraping component; 5. Filter component; 6. Sand cleaning system; 7. Bottom sand discharge component; 8. Buffer chamber; 9. Valve disc; 10. Valve plate; 11. Cavity; 12. Valve stem; 13. Spoke-type pressure sensor; 14. First hydraulic cylinder; 15. Pressure transmitter; 301. Discharge pipe; 302. Inlet pipe; 303. Check valve; 304. Storage tank; 305. Second hydraulic cylinder; 306. Piston block; 307. Liquid guide hole; 308. First liquid guide cover; 401. Limiting block; 402. Scraper; 403. Plug; 404. Through groove; 405. Spring; 406. Slide rod; 502. Second liquid guide cover; 503. Baffle; 504. Through hole; 601. Self-locking geared motor; 602. Rotating frame; 603. Sealing ring; 604. Filter plate; 701. Sand discharge pipe; 702. Solenoid valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] Please see Figures 1-9 As shown, a fracturing gate valve with sand-scraping function for fracturing wellhead device includes a valve seat 1, a valve body 2, a valve stem 12, a first hydraulic cylinder 14, a sand-cleaning system 6, and a sand-scraping component 4, etc. During the use of gate valves, because the valve cavity is filled with sand-containing fluid, sand particles easily adhere to the surface of the gate plate during its reciprocating movement. These adhered sand particles are forcibly carried into the sliding fit gap between the valve plate 10 and the valve disc 9, causing excessive wear of the sealing pair. This leads to faults such as incomplete closure of the gate valve and internal leakage and pressure surge, seriously affecting the operational safety of the fracturing wellhead and the service life of the gate valve. Therefore, a sand cleaning system 6 is installed in conjunction with a sand scraping component 4 to clean the sand particles entering the valve cavity, as detailed below: The valve seat 1 is fixed to the top of the valve body 2. The valve body 2 is provided with a valve plate 10 and a buffer chamber 8. The buffer chamber 8 is opened inside the valve body 2, and the valve plate 10 is located inside the buffer chamber 8. Both the sand cleaning system 6 and the sand scraping component 4 are located inside the valve body 2. The sand cleaning system 6 is used to clean the sand particles that settle inside the valve body 2 cavity. The sand scraping component 4 is located on both sides of the valve plate 10. The sand scraping component 4 scrapes the sand on the surface of the valve plate 10 synchronously with the opening and closing action of the valve plate 10. like Figure 3 As shown, the sand cleaning system 6 includes a rotating frame 602, a self-locking geared motor 601, a flushing component 3, a bottom sand discharge component 7, etc. The rotating frame 602 is rotatably connected to the main flow cavity of the valve body 2. A filter plate 604 is welded inside the rotating frame 602. After the filter plate 604 is rotated to a vertical state, it is used to filter the fluid flowing through the main flow cavity of the valve body 2. The self-locking geared motor 601 is fixed to one side of the outer wall of the valve body 2 by bolts, and the self-locking geared motor 601 is used to drive the rotating frame 602 to rotate along the axis. During the closing process of valve plate 10, the self-locking reduction motor 601 is activated to drive the rotating frame 602 to rotate, turning the horizontal rotating frame 602 to a vertical position, thereby rotating the filter plate 604 to a vertical position to intercept and filter the sand-containing fluid entering the valve body 2. At this time, valve plate 10 is not completely closed, and a certain flow gap is still left (e.g., Figure 5 As mentioned above, most of the sand particles in the sand-containing fluid will be intercepted by the filter plate 604 on the side facing the liquid inlet direction. At this time, the filtered fluid will continuously flush the floating sand adhering to the surface of the valve plate 10. After the valve plate 10 is cleaned, the valve plate 10 will completely descend and close to complete the gate valve closing action. At this time, no adhering sand particles will be carried into the fitting gap between the valve plate 10 and the valve disc 9, which can reduce the occurrence of abnormal wear of the sealing pair from the source. It should be noted that the self-locking geared motor 601 is existing technology. The self-locking geared motor 601 is a speed reduction transmission device that integrates a self-locking function. Its core feature is that it achieves "reverse self-locking" through a mechanical structure (such as a worm gear) - that is, the output shaft (load end) can only be driven to rotate by the input shaft (motor end), and the load reaction force of the output shaft cannot make the input shaft rotate in the opposite direction. Furthermore, the self-locking geared motor 601 is equipped with an encoder, so the number of rotations and rotation angle of the output shaft of the self-locking geared motor 601 are controllable and highly accurate. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0026] A sealing ring 603 is bonded to the outside of the rotating frame 602. The sealing ring 603 contacts the inner wall of the valve body 2 to ensure the sealing performance between the rotating frame 602 and the inner wall of the valve body 2 during rotation, and to prevent sand-containing fluid from leaking from the mating gap between the rotating frame 602 and the valve body 2. It should be noted that the sealing ring 603 is existing technology. The sealing ring 603 is made of wear-resistant elastic rubber material, which has good deformation adaptability and erosion resistance. It can maintain the sealing effect for a long time in the sand-containing fluid environment. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0027] During continuous rinsing, the sand particles intercepted on the surface of filter plate 604 may completely clog it, causing the fluid flow resistance to increase continuously. A rinsing component 3 is also provided to rinse the filter plate 604. like Figure 2 and Figure 3 As shown, the flushing component 3 is disposed on the top outer wall of the valve body 2, and the flushing component 3 is located on the side of the filter plate 604 away from the valve plate 10. The flushing component 3 includes a liquid storage cylinder 304, two liquid guiding holes 307, a first liquid guiding cover 308, a piston block 306, etc. The liquid storage cylinder 304 is welded to the top outer wall of the valve body 2. The outer side of the liquid outlet cylinder 304 is welded with an outlet pipe 301 and an inlet pipe 302 that are connected to the liquid storage cylinder 304. A one-way valve 303 is installed on both the outlet pipe 301 and the inlet pipe 302. The one-way valve 303 ensures that the inlet pipe 302 only allows external fluid to enter the liquid storage cylinder 304, and the outlet pipe 301 only allows the fluid inside the liquid storage cylinder 304 to be discharged to the first liquid guide cover 308. It should be noted that the one-way valve 303 is existing technology. The one-way valve 303 uses the pressure difference of the medium to drive the valve core to move, allowing the fluid to flow in one direction, and automatically forcibly closes under reverse pressure, thereby preventing backflow. Those skilled in the art can set it according to actual needs, which will not be elaborated here. Both liquid guide holes 307 are opened on the top inner wall of the valve body 2. The two liquid guide holes 307 are used to connect the valve body 2 with the liquid outlet pipe 301 and the liquid inlet pipe 302 respectively. The first liquid guide cover 308 has a cover structure with open ends. The first liquid guide cover 308 is welded to the top inner wall of the valve body 2, and the first liquid guide cover 308 covers the liquid guide hole 307 connected to the liquid outlet pipe 301 with one end opening towards the filter plate 604. It should be noted that the pore size of the filter plate 604 can be adapted and adjusted according to the sand concentration and particle size range of the actual fracturing operation. Those skilled in the art can set it according to actual needs, which will not be elaborated here. The piston block 306 is slidably connected to the inside of the liquid storage cylinder 304. The top outer wall of the liquid storage cylinder 304 is fixed with a second hydraulic cylinder 305 by bolts. The telescopic end of the second hydraulic cylinder 305 passes through the liquid storage cylinder 304 and is fixed to the piston block 306. The second hydraulic cylinder 305 is used to drive the piston block 306 to move up and down. It should be noted that the piston block 306 is existing technology. Those skilled in the art can match the corresponding specifications of the product according to the volume of the liquid storage cylinder 304 and the required flushing pressure. This will not be elaborated here. When the second hydraulic cylinder 305 is activated to pull the piston block 306 upward, the external fluid opens the one-way valve 303 on the inlet pipe 302 through the inlet pipe 302 and flows into the storage cylinder 304 to complete the storage. When the filter plate 604 is clogged in the filtration state, the second hydraulic cylinder 305 is activated to push the piston block 306 downward rapidly. The fluid in the liquid storage cylinder 304 is squeezed, and the high-speed fluid enters the first liquid guide cover 308 along the liquid guide hole 307. Finally, it is sprayed out directionally from the opening of the first liquid guide cover 308 and is aimed at the surface of the filter plate 604 to perform high-pressure flushing. This washes away the sand particles that were originally intercepted and attached to the surface of the filter plate 604 and pushes them off to the edge area of ​​the filter plate 604, thereby ensuring that the filter plate 604 can maintain good filtration and interception capabilities. When the filter plate 604 is in a horizontal and unused state, the flushing component 3 is used to flush away the sand particles remaining on the surface of the filter plate 604. The flushed sand particles can be directly carried out of the valve body 2 by the fluid, ensuring that there is no residual sand particle accumulation on the surface of the filter plate 604, and will not hinder the rotating frame 602 from rotating to the working position next time.

[0028] However, the fluid entering the storage tank 304 may carry sand particles. If the sand particles settle and accumulate inside the storage tank 304 for a long time, it will easily increase the wear of the piston block 306 during the sliding process and may also cause the piston block 306 to jam. At the same time, the high-pressure fluid ejected will also carry out the sand particles deposited in the storage tank 304, which will cause additional wear to the filter plate 604. Therefore, a filter component 5 is provided on the top inner wall of the valve body 2. The filter component 5 is located at the liquid guide hole 307 connected to the liquid inlet pipe 302. like Figure 4As shown, the filter component 5 includes a second liquid guide cover 502 welded to the inner wall of the top of the main flow cavity of the valve body 2. The second liquid guide cover 502 is inclined away from the valve plate 10. The bottom of the second liquid guide cover 502 is provided with a plurality of equally spaced through holes 504. The bottom of the second liquid guide cover 502 is welded with a plurality of baffles 503. The baffles 503 have a one-sided opening structure, and the opening end faces the valve plate 10. The baffles 503 cover the through holes 504. The fluid enters the second liquid guide cover 502 through the through holes 504. At this time, the sand particles cannot pass through the through holes 504 and will slide back into the main flow cavity of the valve body 2 under the action of gravity. This ensures that the fluid entering the liquid storage cylinder 304 does not contain sand particles, effectively preventing the inner wall of the liquid storage cylinder and the piston block 306 from being worn and stuck by sand particles. It also prevents the secondary outflow of sand particles during the rinsing process from causing additional damage to the filter plate 604 and the valve plate 10. Meanwhile, the inclined second liquid guide cover 502 works in conjunction with the baffle 503. During normal operation, sand particles can slide down the inclined surface of the second liquid guide cover 502 under the action of gravity, and will not accumulate on the surface of the second liquid guide cover 502 to block the through hole 504, thus ensuring the stability of the filter component 5 in long-term operation.

[0029] refer to Figures 7-9 The filter plate 604 has a raised structure, which can be a raised arc structure, a raised cone structure, or a raised disc structure in the middle. When the filter plate 604 is in a vertical state, the raised surface allows the intercepted sand particles to slide down along the raised contour towards the edge of the filter plate 604, avoiding the accumulation of sand particles in the central area of ​​the filter plate 604, further reducing the probability of large-area blockage of the filter plate 604, and ensuring the normal flow capacity of the fluid. When the filter plate 604 is in a horizontal state, the fluid can directly flush the raised contours, making it easier to wash off the residual sand particles attached to the gaps of the raised contours, further improving the sand cleaning effect on the surface of the filter plate 604.

[0030] Furthermore, since the buffer chamber 8 is relatively deep, the sand particles deposited at the bottom of the buffer chamber 8 cannot be directly discharged from the valve body 2 in the manner described above. Therefore, a bottom sand discharge component 7 is also provided on the bottom outer wall of the valve body 2. The bottom sand discharge component 7 is connected to the buffer chamber 8 and is used to discharge the sand particles deposited at the bottom of the buffer chamber 8. refer to Figure 2 The bottom sand discharge component 7 includes a sand discharge pipe 701, which is welded to the bottom outer wall of the valve body 2. The top of the sand discharge pipe 701 is connected to the inside of the buffer chamber 8. A solenoid valve 702 is installed on the sand discharge pipe 701. During the flushing process, the solenoid valve 702 is opened, and the sand particles deposited in the buffer chamber 8 can be discharged directly to the outside of the valve body 2 along the sand discharge pipe 701 under the action of fluid pressure. This completes the directional cleaning of the sand accumulated at the bottom of the buffer chamber 8, avoids the accumulation of sand particles at the bottom of the buffer chamber 8, and ensures that the valve plate 10 can move up and down normally. It should be noted that the solenoid valve 702 is existing technology. The solenoid valve 702 is an industrial device controlled by electromagnetic force, which can be remotely controlled to open and close. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0031] Then, some tightly adhered sand particles remain on the surface of the valve plate 10. A flushing component 3 and a sand scraping component 4 are also provided to perform a secondary cleaning of the sand particles remaining on the surface of the valve plate 10 and inside the valve cavity. The specific cleaning process is as follows: The valve plate 10 has a wedge-shaped structure that is wider at the top and narrower at the bottom. Two valve discs 9 are installed in the main flow cavity of the valve body 2. The two valve discs 9 are located on both sides of the valve plate 10. When the valve plate 10 is fully closed, the wedge-shaped surface of the valve plate 10 and the valve discs 9 are sealed and fitted to achieve the closure of the gate valve. Both sides of the valve plate 10 are provided with concave cavities 11. When the valve plate 10 moves down to close, the fluid can enter the buffer cavity 8 through the concave cavity 11, which can effectively reduce the fluid resistance encountered by the valve plate 10 during the downward movement and make the opening and closing action of the valve plate 10 smoother. The top of the valve plate 10 is fixed with a valve stem 12 by bolts, and the bottom end of the valve stem 12 passes through the valve seat 1. The top of the valve seat 1 is fixed with a first hydraulic cylinder 14 by bolts. The first hydraulic cylinder 14 is used to drive the valve stem 12 to move. Activating the first hydraulic cylinder 14 drives the valve stem 12 to rise and fall vertically, which can drive the valve plate 10 to complete the opening and closing action. It should be noted that: the first hydraulic cylinder 14 and the second hydraulic cylinder 305 in this application are both actuators in the hydraulic system. The extension and retraction function is realized by the hydraulic system control in conjunction with the fracturing manifold. Furthermore, by cooperating with magnetic switches, proximity switches or photoelectric switches, the extension and retraction displacement of the piston rods of the first hydraulic cylinder 14 and the second hydraulic cylinder 305 can be precisely controlled. Those skilled in the art can set it according to actual needs, which will not be elaborated here. refer to Figure 5 and Figure 6 The sand-scraping component 4 includes two scrapers 402, two limiting blocks 401, multiple through grooves 404, a plug 403, and a spring 405, etc. Two scrapers 402 are respectively disposed on both sides of the valve plate 10 to scrape off the sand particles attached to the inside of the valve plate 10. Two limiting blocks 401 are welded to the top of the valve plate 10, and the opposite sides of the two limiting blocks 401 are flush with the two sides of the valve plate 10. Multiple through grooves 404 are evenly opened on both sides of the valve body 2. A slide rod 406 is slidably connected in the through groove 404, and the slide rod 406 is fixed to the scraper 402. A plug 403 is threadedly connected to the end of the through groove 404 away from the slide rod 406. A spring 405 is disposed inside the through groove 404, and the two ends of the spring 405 are in contact with the plug 403 and the slide rod 406 respectively. During the downward or upward movement of the valve plate 10, the spring 405 continuously pushes the slide rod 406 to move towards one side of the valve plate 10, thereby causing the scraper 402 to fit tightly against the surface of the valve plate 10. As the valve plate 10 moves up and down, the scraper 402 can directly scrape off the tightly adhered sand particles on the surface of the valve plate 10, thoroughly removing the residual sand on the surface of the valve plate 10 and preventing the valve plate 10 from bringing sand particles into the sealing mating surface. When the valve plate 10 is completely closed, the scraper 402 will move to contact the limiting block 401, limiting the position of the scraper 402. It should be noted that those skilled in the art will understand that spring 405 is a common consumable part, and its periodic replacement falls within the scope of routine equipment maintenance. In actual use, the frequency of use and lifespan of spring 405 are within a reasonable range and will not affect the overall stability of the equipment. When disassembling spring 405, only the plug 403 needs to be removed to remove spring 405 as a whole for replacement.

[0032] In actual operation, a pressure transmitter 15 is fixed to one side of the outer wall of the valve body 2 by bolts, and one end of the pressure transmitter 15 passes through the valve body 2 and is inserted into the valve body 2. The pressure transmitter 15 is located between the filter plate 604 and the valve plate 10. When the filter plate 604 is in the filtering working state, the pressure transmitter 15 can detect the fluid pressure between the filter plate 604 and the valve plate 10 in real time. When the surface of the filter plate 604 is blocked, the fluid flow cross-sectional area is reduced, and the fluid pressure between the filter plate 604 and the valve plate 10 will gradually decrease. When the pressure drops to the preset threshold, the flushing component 3 is activated to perform high-pressure backflushing to clear the blockage of the filter plate 604. It should be noted that the pressure transmitter 15 in this application is prior art. The pressure transmitter 15 can be of model ALDYL3151. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0033] A spoke-type pressure sensor 13 is fixed to the top of the valve stem 12 by bolts. The detection end of the spoke-type pressure sensor 13 is fixed to the extension end of the first hydraulic cylinder 14. The spoke-type pressure sensor 13 can detect the resistance encountered by the valve stem 12 during its descent in real time. When the resistance exceeds the preset threshold, it indicates that there is still sand accumulation on the surface of the valve plate 10. At this time, the descent of the valve plate 10 is paused, and the valve plate 10 is moved upward to continue flushing. This process is repeated until the resistance detected by the spoke-type pressure sensor 13 falls back to the preset threshold range. Then, the valve plate 10 is controlled to continue descending to complete the closing action. It should be noted that the spoke-type pressure sensor 13 in this application is prior art. The spoke-type pressure sensor 13 can be of model JLBU-1. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0034] Working principle of the invention: When the gate valve needs to be closed for fracturing operations, the first hydraulic cylinder 14 is activated, driving the valve stem 12 to push the valve plate 10 downward. At the same time, the self-locking reduction motor 601 is activated, driving the rotating frame 602 to rotate from the horizontal position to the vertical position, so that the filter plate 604 rotates the main passage of the valve body 2 to pre-filter the sand-containing fluid. As the valve plate 10 moves downward, the spring 405 continuously pushes the slide bar 406 to make the scraper 402 stick tightly to both sides of the valve plate 10. As the valve plate 10 moves downward, it scrapes off the firmly adhering residual sand particles on the surface. The scraped-off sand particles are carried away by the continuously flowing filter fluid. At this time, the valve plate 10 is not completely closed, and the main passage still retains a flow gap. The filtered fluid continues to flush the surface of the valve plate 10, washing away the sand particles adhering to the surface. During the flushing process, the filter plate 604 becomes clogged. The second hydraulic cylinder 305 is activated, which pushes the piston block 306 in the liquid storage cylinder 304 downwards quickly. The clean high-pressure fluid pre-stored in the liquid storage cylinder 304 is sprayed out from the first liquid guide cover 308 in a directional manner to perform high-pressure flushing on the surface of the filter plate 604, thus completing the unclogging of the filter plate 604. At the same time, the solenoid valve 702 is opened, and the accumulated sand flushed down in the buffer chamber 8 will be discharged directly to the outside of the valve body 2 through the sand discharge pipe 701 under the action of fluid pressure. After the rinsing is cleaned, the first hydraulic cylinder 14 is started to continue pushing the valve plate 10 downward until it is fully closed, thus completing the gate valve closing action. Subsequently, the self-locking geared motor 601 starts and drives the rotating frame 602 to rotate in the opposite direction, so that the filter plate 604 rotates to the horizontal retracted state; After the valve plate 10 is opened again, the second hydraulic cylinder 305 is activated, which pulls the piston block 306 in the liquid storage tank 304 upward. External fluid flows into the liquid storage tank 304 through the liquid inlet pipe 302 to replenish the liquid. At the same time, the fluid will flush the filter plate 604, washing off all the sand residue on the surface of the filter plate 604 and carrying it out of the valve body 2 by the flowing fluid.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A fracturing gate valve with sand-scraping function for fracturing wellhead equipment, characterized in that, include: Valve seat (1) and valve body (2), valve seat (1) is fixed to the top of valve body (2), valve body (2) is provided with valve plate (10) and buffer cavity (8) inside, buffer cavity (8) is opened inside valve body (2), and valve plate (10) is located inside buffer cavity (8); The sand cleaning system (6) and the sand scraping component (4) are both located inside the valve body (2). The sand cleaning system (6) is used to clean the sand particles that settle inside the valve body (2). The sand scraping component (4) is located on both sides of the valve plate (10). The sand scraping component (4) scrapes the sand on the surface of the valve plate (10) in sync with the opening and closing action of the valve plate (10). The sand cleaning system (6) includes: Rotary frame (602) is rotatably connected to the main flow cavity of valve body (2). Filter plate (604) is fixedly connected inside the rotating frame (602). After the filter plate (604) is rotated to a vertical state, it is used to filter the fluid flowing through the main flow cavity of valve body (2).

2. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 1, characterized in that, The sand removal system (6) also includes: The self-locking geared motor (601) is fixedly connected to the outer wall of one side of the valve body (2), and the self-locking geared motor (601) is used to drive the rotating frame (602) to rotate along the axis. The filter plate (604) is a raised structure, and a sealing ring (603) is fixedly connected to the outer side of the rotating frame (602). The flushing component (3) is located on the top outer wall of the valve body (2) and is located on the side of the filter plate (604) away from the valve plate (10) for flushing the filter plate (604). The bottom sand discharge component (7) is located on the bottom outer wall of the valve body (2) and is connected to the buffer chamber (8) to discharge the sand particles deposited at the bottom of the buffer chamber (8).

3. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 2, characterized in that, The flushing component (3) includes: The liquid storage cylinder (304) is fixedly connected to the top outer wall of the valve body (2). The liquid outlet cylinder (304) is fixedly connected to the outside of the liquid outlet cylinder (304) with a liquid outlet pipe (301) and a liquid inlet pipe (302) communicating with the liquid storage cylinder (304). A one-way valve (303) is installed on both the liquid outlet pipe (301) and the liquid inlet pipe (302). Two liquid guide holes (307) are provided on the top inner wall of the valve body (2). The two liquid guide holes (307) are used to connect the valve body (2) with the liquid outlet pipe (301) and the liquid inlet pipe (302), respectively. The first liquid guide cover (308) and the filter component (5) are both fixedly connected to the top inner wall of the valve body (2). The first liquid guide cover (308) covers the liquid guide hole (307) connected to the liquid outlet pipe (301) with one end opening towards the filter plate (604). The filter component (5) is located at the liquid guide hole (307) connected to the liquid inlet pipe (302). Piston block (306) is slidably connected to the inside of liquid storage cylinder (304). A second hydraulic cylinder (305) is fixedly connected to the top outer wall of the liquid storage cylinder (304), and the telescopic end of the second hydraulic cylinder (305) passes through the liquid storage cylinder (304) and is fixed to the piston block (306).

4. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 3, characterized in that, The filter component (5) includes a second liquid guide cover (502) fixedly connected to the inner wall of the top of the main flow cavity of the valve body (2), and the second liquid guide cover (502) is inclined in the direction away from the valve plate (10). The bottom of the second liquid guide cover (502) is provided with a plurality of equally spaced through holes (504). The bottom of the second liquid guide cover (502) is fixedly connected with a plurality of baffles (503). The baffles (503) have a one-sided opening structure, and the opening end faces the valve plate (10). The baffles (503) cover the through holes (504).

5. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 2, characterized in that, The bottom sand discharge component (7) includes a sand discharge pipe (701), which is fixedly connected to the bottom outer wall of the valve body (2), and the top of the sand discharge pipe (701) is connected to the inside of the buffer chamber (8). A solenoid valve (702) is installed on the sand discharge pipe (701).

6. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 1, characterized in that, The scraping component (4) includes: Two scrapers (402) are respectively set on both sides of the valve plate (10) to scrape off the sand particles attached to the inside of the valve plate (10); Two limiting blocks (401) are fixedly connected to the top of the valve plate (10), and the opposite sides of the two limiting blocks (401) are flush with the two sides of the valve plate (10). Multiple through slots (404) are evenly opened on both sides of the valve body (2). A slide rod (406) is slidably connected in the through slot (404), and the slide rod (406) is fixed to the scraper (402). The plug (403) and spring (405) are threadedly connected to one end of the through groove (404) away from the slide rod (406), and the spring (405) is located inside the through groove (404), with the two ends of the spring (405) contacting the plug (403) and the slide rod (406) respectively.

7. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 1, characterized in that, Two valve discs (9) are installed in the main flow cavity of the valve body (2). The two valve discs (9) are located on both sides of the valve plate (10). A cavity (11) is opened on both sides of the valve plate (10).

8. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 7, characterized in that, A valve stem (12) is fixedly connected to the top of the valve plate (10), and the bottom end of the valve stem (12) passes through the valve seat (1). A first hydraulic cylinder (14) is fixedly connected to the top of the valve seat (1), and the first hydraulic cylinder (14) is used to drive the valve stem (12) to move.

9. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 1, characterized in that, A pressure transmitter (15) is fixedly connected to one side of the outer wall of the valve body (2), and one end of the pressure transmitter (15) passes through the valve body (2) and is inserted into the valve body (2), and the pressure transmitter (15) is located between the filter plate (604) and the valve plate (10).

10. A fracturing gate valve with sand-scraping function for a fracturing wellhead device according to claim 8, characterized in that, A spoke-type pressure sensor (13) is fixedly connected to the top of the valve stem (12), and the detection end of the spoke-type pressure sensor (13) is fixed to the extension end of the first hydraulic cylinder (14).

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