Integral Body Cover Gate Valve

Abstract

The present invention relates to the technical field of valves, and particularly to an integrated valve body and valve cover gate valve, which includes a valve body, an inlet end and an outlet end provided on the valve body, a valve cover provided on the valve body, a valve stem provided on the valve cover, a gate plate provided at the lower end of the valve stem, a mounting plate provided on the valve body, a lifting opening formed on the mounting plate, a medium perforation formed on the mounting plate, a sliding perforation formed on the valve body, a U-shaped seat provided on the valve body, a filter screen provided on the U-shaped seat, a fixing mechanism provided on the U-shaped seat, a first sealing member provided on the U-shaped seat, a plate-shaped opening longitudinally formed on the U-shaped seat, a closing plate provided on the U-shaped seat, a cleaning block provided on the side end face of the closing plate, a locking member provided on the closing plate, and a second sealing member provided between the closing plate and the U-shaped seat. The filter screen can filter impurities in the flowing medium, prevent the impurities from adhering to the gate plate and affecting the sealing performance of the valve, and facilitate the cleaning of the impurities.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a valve body and cover integrated gate valve. Background Art

[0002] A gate valve is a type of valve whose closing and opening member is a gate plate, and the movement direction of the gate plate is perpendicular to the fluid direction. The main structure of the gate valve includes parts such as a valve body, a valve seat, a valve cover, a gate plate, and a valve stem. The valve body is provided with a medium flow channel, the gate plate is provided with a sealing surface that forms a sealing fit with the valve seat, and the valve stem connects the gate plate and the actuator. A guiding mechanism is provided inside the valve body to ensure that the gate plate will not be unstable and deviate during movement, and to ensure the sealing reliability of the valve.

[0003] Gate valves are commonly used in conveying scenarios such as industrial pipelines, sewage treatment, water supply systems, natural gas systems, and the petroleum industry. Their main function is to cut off or regulate the medium transportation in the pipeline. However, when gate valves are applied to scenarios where the medium in sewage treatment or water supply systems contains impurities, it is difficult to filter the impurities in the medium. As a result, some impurities in the medium adhere to the gate plate, and after long-term use, it is easy to affect the sealing performance of the valve when the gate plate is closed. Although some gate valves are provided with a filter screen at the inlet end and can also filter the impurities, when cleaning the impurities on the filter screen, the gate valve needs to be removed from the pipeline for operation, and the cleaning process of the filter screen is relatively cumbersome. Summary of the Invention

[0004] The purpose of the present invention is to provide a valve body and cover integrated gate valve that can filter impurities in the medium and prevent the impurities from adhering to the gate plate and affecting the sealing performance of the valve in view of the defects and deficiencies of the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions: a valve body cover integrated gate valve, including a valve body, an inlet end and an outlet end provided on the valve body, a valve cover provided on the valve body, a valve stem that is liftably provided on the valve cover and located inside the valve body, a gate plate provided at the lower end of the valve stem, further including a mounting plate provided on the valve body inside the inlet end, a lifting opening formed on the mounting plate, a medium perforation formed on the mounting plate and communicating with the lifting opening for allowing the medium to pass through the mounting plate, a sliding perforation formed on the valve body and communicating with the lifting opening, a U-shaped seat that is liftably provided between the valve body and the gate plate and located inside the lifting opening and the sliding perforation, a filter screen provided on the U-shaped seat for filtering impurities in the medium when the medium passes through the mounting plate from the medium perforation, a fixing mechanism provided between the upper end of the U-shaped seat and the valve body for fixing or releasing the fixing of the U-shaped seat in the lifting opening and the sliding perforation, a first sealing member provided between the upper end of the U-shaped seat and the valve body and located inside the sliding perforation for sealing the gap between the U-shaped seat and the sliding perforation when the fixing mechanism fixes the U-shaped seat in the lifting opening and the sliding perforation, a plate-shaped opening longitudinally formed on the U-shaped seat, a closing plate that is liftably provided on the U-shaped seat and located inside the plate-shaped opening, a cleaning block provided on the side end face of the closing plate for scraping off some impurities on the surface of the filter screen when the closing plate descends in the plate-shaped opening, a locking member provided between the upper end of the closing plate and the U-shaped seat for fixing or releasing the fixing of the closing plate on the U-shaped seat after the closing plate ascends in the plate-shaped opening, and a second sealing member provided between the closing plate and the U-shaped seat for sealing the gap between the closing plate and the plate-shaped opening after the locking member fixes the closing plate on the U-shaped seat.

[0006] Further improvement is: the upper end of the U-shaped seat passes through the sliding perforation and is located outside the valve body. The fixing mechanism includes two fixing seats provided on the valve body and located on the left and right sides of the upper end of the U-shaped seat, two transverse movement perforations horizontally penetrating through the two fixing seats, two square slots formed on the left and right ends of the U-shaped seat for corresponding to the positions of the transverse movement perforations after the U-shaped seat descends to a predetermined position, two limiting slide rods respectively slidably provided on the two fixing seats and located inside the transverse movement perforations for engaging with the square slots when the positions of the square slots and the transverse movement perforations correspond, two driving openings respectively horizontally formed on the upper end faces of the two fixing seats and communicating with the transverse movement perforations, and two vertical driving rods respectively vertically provided on the two limiting slide rods and in clearance fit with the driving openings.

[0007] Further improvement is: arc-shaped openings are respectively formed on the upper end faces of the two fixing seats. The arc-shaped openings communicate with the driving openings, the arc-shaped openings communicate with the transverse movement perforations, and the arc-shaped openings are in clearance fit with the vertical driving rods.

[0008] Further improvement is that: the lower end surfaces of the two limit slide bars are provided with abutting planes.

[0009] Further improvement is that: the first seal includes a first inclined hole formed in the valve body and communicating with the sliding through hole, and a first inclined block is provided on the circumferential side of the upper end of the U-shaped seat, and the first inclined block is an elastic block.

[0010] Further improvement is that: one end of the cleaning block is fixedly arranged on one side of the closing plate, the other end of the cleaning block is arranged to incline downward, and the other end of the cleaning block abuts against the side end face of the filter screen.

[0011] Further improvement is that: the locking member includes a locking seat arranged on the upper end face of the U-shaped seat and on one side of the closing plate, a threaded hole formed in the locking seat, a corresponding card hole formed in the closing plate for corresponding to the position of the threaded hole after the closing plate rises to a predetermined position in the plate-shaped opening, and a locking bolt threadedly connected to the locking seat and located in the threaded hole for engaging with the corresponding card hole after the positions of the corresponding card hole and the threaded hole correspond to each other. The screw part of the locking bolt has a clearance fit with the corresponding card hole.

[0012] Further improvement is that: the second seal includes a second inclined hole formed in the lower end face of the U-shaped seat and communicating with the plate-shaped opening, a connecting frame plate is arranged on the circumferential side of the closing plate, the connecting frame plate is located above the cleaning block, and a second inclined block is arranged on the upper end face of the connecting frame plate, and the second inclined block is an elastic block.

[0013] After adopting the above technical solution, the beneficial effects of the present invention are as follows: When the gate valve is applied to the application scenarios where the medium in the sewage treatment or tap water system contains impurities, the medium enters from the inlet end and passes through the mounting plate through the medium perforations. At this time, the filter screen filters the impurities in the medium, so that the filtered impurities flow out towards the outlet end, and it is not easy for some impurities in the medium to adhere to the gate plate. After long-term use, it is not easy to affect the sealing performance of the gate plate for the valve. When it is necessary to clean the impurities on the filter screen, first control the medium to stop entering the inlet end, and control the gate plate to close and seal the valve. Then, release the fixing of the closing plate on the U-shaped seat through the locking member, and push the closing plate to descend in the plate-shaped opening. During the descent of the closing plate, the cleaning block follows the closing plate to descend, so that the other end of the cleaning block scrapes the impurities on the surface of the filter screen downward until the lower end of the closing plate abuts against the U-shaped seat. At this time, the scraped impurities accumulate in the space between the lower end of the cleaning block and the U-shaped seat and the closing plate, so as to collect the scraped impurities. Then, release the fixing of the U-shaped seat in the lifting opening and the sliding perforation through the fixing mechanism, lift the U-shaped seat out of the lifting opening and the sliding perforation, and then pull the closing plate to rise in the plate-shaped opening, so as to process the scraped impurities and perform secondary cleaning on the filter screen. The impurities can be cleaned without disassembling the valve body, and the cleaning process of the filter screen is relatively simple, which can improve the filtering effect of the filter screen on impurities and reduce the phenomenon of impurity blockage of the filter screen.

[0014] Further effects: When it is necessary to install the filter screen on the mounting plate, put the U-shaped seat into the lifting opening from the sliding perforation until the U-shaped seat abuts against the mounting plate. At this time, fix the U-shaped seat in the lifting opening and the sliding perforation through the fixing mechanism, seal the gap between the U-shaped seat and the sliding perforation through the first sealing member, and then pull the closing plate to rise in the plate-shaped opening to prevent the closing plate from affecting the flow of the medium in the medium perforations. After pulling the closing plate up to the limit position, fix the closing plate on the U-shaped seat through the locking member to prevent the closing plate from descending in the plate-shaped opening, and seal the gap between the closing plate and the plate-shaped opening through the second sealing member.

[0015] Further effects: The cleaning block can not only scrape off some impurities attached to the filter screen, but also, after the lower end of the closing plate abuts against the U-shaped seat, accumulate the impurities at a specific position to prevent the phenomenon of impurities flowing randomly with the medium, which can improve the cleaning effect of the impurities on the surface of the filter screen.

[0016] Further effect: When it is necessary to fix the U-shaped seat in the lifting opening and the sliding perforation, press down the U-shaped seat so that it is completely installed in the lifting opening. At this time, when the position of the square slot corresponds to that of the transverse movement perforation, pull the two vertical drive rods respectively to drive the two limit slide rods to approach the U-shaped seat until the two limit slide rods are engaged with the square slot, thereby restricting the U-shaped seat from rising in the lifting opening and the sliding perforation to realize the fixing process of the U-shaped seat; when it is necessary to release the fixing of the U-shaped seat in the lifting opening and the sliding perforation, pull the two vertical drive rods respectively to drive the two limit slide rods to move away from the U-shaped seat until the two limit slide rods are disengaged from the square slot, so that the U-shaped seat can be pulled out from the lifting opening and the sliding perforation to realize the process of releasing the fixing of the U-shaped seat.

[0017] Further effect: When pulling the two vertical drive rods to drive the two limit slide rods to approach the U-shaped seat until the limit slide rods are engaged with the square slot, pull the two vertical drive rods again into the arc-shaped opening. Through the engagement and cooperation between the arc-shaped opening and the vertical drive rods, the lateral movement of the limit slide rods in the transverse movement perforation can be further restricted to maintain the fixing effect of the limit slide rods on the U-shaped seat.

[0018] Further effect: By making the abutting plane contact with the lower plane of the square slot, when the abutting plane presses on the lower plane of the square slot and the two vertical drive rods are pulled into the arc-shaped opening, the vertical drive rods drive the limit slide rods to rotate, so that the limit slide rods rotate in the transverse movement perforation, so that the arc-shaped surface of the limit slide rods further presses against the lower plane of the square slot to further improve the pressing down of the U-shaped seat and improve the fixing effect on the U-shaped seat.

[0019] Further effect: When the U-shaped seat is completely pressed on the mounting plate in the lifting opening, the first inclined block is in extrusion fit with the first inclined hole. At this time, the first inclined block is elastically deformed by extrusion, thereby sealing the gap between the U-shaped seat and the sliding perforation; and when the vertical drive rod drives the limit slide rod to rotate, so that the arc-shaped surface of the limit slide rod further presses down against the lower plane of the square slot, the first inclined block is further compressed and elastically deformed, thereby further improving the sealing performance between the U-shaped seat and the sliding perforation.

[0020] Further effect: When the closing plate rises in the plate-shaped opening to a position where the corresponding card holes and the threaded holes are in correspondence, turn the locking bolt on the locking seat until the locking bolt is inserted into the corresponding card hole and slightly presses against the side end face of the closing plate. The lifting of the closing plate is restricted by the extrusion between the locking bolt and the closing plate. The corresponding card holes can not only improve the restricting effect on the lifting of the closing plate, but also prevent the medium from impacting the closing plate and vibrating to drive the closing plate to lift slightly when the medium flows.

[0021] Further effect: When the closing plate is pulled up to the maximum limit within the plate-shaped opening, the second inclined block is in extrusion fit with the second inclined hole. As the locking bolt is inserted into the corresponding card hole, the second inclined block is pressed against the lower end surface of the U-shaped seat within the second inclined hole, thereby sealing the gap between the closing plate and the plate-shaped opening. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 is the structural schematic diagram of the present invention;

[0024] Figure 2 is the partial sectional view of the valve body, mounting plate, and U-shaped seat in the present invention;

[0025] Figure 3 is corresponding to Figure 2 another state diagram;

[0026] Figure 4 is corresponding to Figure 2 the enlarged view of part A;

[0027] Figure 5 is the structural schematic diagram of the fixed seat in the present invention;

[0028] Figure 6 is the structural schematic diagram of the U-shaped seat in the present invention;

[0029] Figure 7 is the structural schematic diagram of the closing plate in the present invention;

[0030] Figure 8 is corresponding to Figure 2 the enlarged view of part B;

[0031] Figure 9 is the partial sectional view of the valve body, mounting plate, lifting opening, medium perforation, and sliding perforation in the present invention;

[0032] Figure 10 is corresponding to Figure 2 the enlarged view of part C;

[0033] Figure 11 is the side sectional view of the valve body, mounting plate, lifting opening, medium perforation, and sliding perforation in the present invention;

[0034] Figure 12It is a side sectional view of the valve body, mounting plate, and closing plate in the present invention.

[0035] Explanation of reference numerals: valve body 1, inlet end 2, outlet end 3, valve cover 4, valve rod 5, gate plate 6, mounting plate 7, lifting opening 8, medium perforation 9, sliding perforation 10, U-shaped seat 11, filter screen 12, plate-shaped opening 13, closing plate 14, cleaning block 15, fixed seat 16, transverse movement perforation 17, square slot 18, limiting slide bar 19, driving opening 20, vertical driving rod 21, arc-shaped opening 22, abutting plane 23, first inclined hole 24, first inclined block 25, locking seat 26, threaded hole 27, corresponding clamping hole 28, locking bolt 29, second inclined hole 30, second inclined block 31, connecting frame plate 32. Detailed implementation manners

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Refer to Figures 1 to 12As shown in the figure, the technical solution adopted in this specific embodiment is as follows: a valve body 1 cover integrated gate valve, including a valve body 1, an inlet end 2 and an outlet end 3 provided on the valve body 1, a valve cover 4 provided on the valve body 1, a valve stem 5 that can be lifted and is located inside the valve body 1 on the valve cover 4, a gate plate 6 provided at the lower end of the valve stem 5, and further including a mounting plate 7 provided on the valve body 1 inside the inlet end 2, a lifting opening 8 opened on the mounting plate 7, a medium perforation 9 opened on the mounting plate 7 and communicating with the lifting opening 8 for allowing the medium to pass through the mounting plate 7, a sliding perforation 10 opened on the valve body 1 and communicating with the lifting opening 8, a U-shaped seat 11 that can be lifted and is located in the lifting opening 8 and the sliding perforation 10 on the valve body 1 and the gate plate 6, a filter screen 12 provided on the U-shaped seat 11 for filtering impurities in the medium when the medium passes through the mounting plate 7 from the medium perforation 9, a fixing mechanism provided between the upper end of the U-shaped seat 11 and the valve body 1 for fixing or releasing the fixing of the U-shaped seat 11 in the lifting opening 8 and the sliding perforation 10, a first sealing member provided between the upper end of the U-shaped seat 11 and the valve body 1 and located in the sliding perforation 10 for sealing the gap between the U-shaped seat 11 and the sliding perforation 10 when the fixing mechanism fixes the U-shaped seat 11 in the lifting opening 8 and the sliding perforation 10, a plate-shaped opening 13 longitudinally opened on the U-shaped seat 11, a closing plate 14 that can be lifted and is located in the plate-shaped opening 13 on the U-shaped seat 11, a cleaning block 15 provided on the side end face of the closing plate 14 for scraping off some impurities on the surface of the filter screen 12 when the closing plate 14 descends in the plate-shaped opening 13, a locking member provided between the upper end of the closing plate 14 and the U-shaped seat 11 for fixing or releasing the fixing of the closing plate 14 on the U-shaped seat 11 after the closing plate 14 rises in the plate-shaped opening 13, and a second sealing member provided between the closing plate 14 and the U-shaped seat 11 for sealing the gap between the closing plate 14 and the plate-shaped opening 13 after the locking member fixes the closing plate 14 on the U-shaped seat 11. The valve body 1 and the valve cover 4 are produced or cast separately during production. After the components such as the valve body 1, the valve cover 4, the valve stem 5, and the gate plate 6 are assembled, the valve cover 4 is installed on the valve body 1, and then the valve cover 4 is fixed on the valve body 1 by welding, so as to form an integral fixation of the valve body 1 and the cover body, which can improve the sealing performance between the valve body 1 and the valve cover 4. The mounting plate 7 is provided by welding or integrally formed with the valve body 1. The lifting opening 8 and the sliding perforation 10 can also be integrally formed with the valve body 1, or after the mounting plate 7 and the valve body 1 are integrally formed, the lifting opening 8 and the sliding perforation 10 are processed by equipment. The shape of the mounting plate 7 is the same as the inner wall shape of the valve body 1. In this application, the shape of the mounting plate 7 is circular. The number of the lifting opening 8, the sliding perforation 10, and the U-shaped seat 11 can be set to one or more. When only one is set, its volume is relatively large; if multiple are set, they need to be distributed equidistantly in a ring shape. The number of the connected components such as the filter screen 12, the fixing mechanism, and the first sealing member corresponds to the number of the lifting opening 8, the sliding perforation 10, and the U-shaped seat 11.

[0038] The upper end of the U-shaped seat 11 passes through the sliding perforation 10 and is located outside the valve body 1. The fixing mechanism includes two fixing seats 16 arranged on the valve body 1 and located on the left and right sides of the upper end of the U-shaped seat 11, two transverse movement perforations 17 transversely penetrating through the two fixing seats 16, two square slots 18 opened at the left and right ends of the U-shaped seat 11 for corresponding to the positions of the transverse movement perforations 17 after the U-shaped seat 11 descends to a predetermined position, two limiting sliding rods 19 respectively slidably arranged on the two fixing seats 16 and located in the transverse movement perforations 17 for engaging with the square slots 18 when the positions of the square slots 18 and the transverse movement perforations 17 correspond, two driving openings 20 respectively transversely opened on the upper end surfaces of the two fixing seats 16 and communicating with the transverse movement perforations 17, and two vertical driving rods 21 respectively vertically arranged on the two limiting sliding rods 19 and in clearance fit with the driving openings 20.

[0039]

[0039] The lower end of the fixing seat 16 is a square seat, and the upper end is an arc shape; the fixing seat 16 is fixed to the valve body 1 by welding or bonding or integral casting. The predetermined position for the U-shaped seat 11 to descend is the position where the pressed U-shaped seat 11 is completely installed in the lifting opening 8 and the lower end of the closing plate 14 abuts against the U-shaped seat 11. The corresponding number of the fixing seats 16 can also be one, and is arranged on one side of the U-shaped seat 11.

[0040] Arc-shaped openings 22 are respectively opened on the upper end surfaces of the two fixing seats 16. The arc-shaped openings 22 communicate with the driving openings 20, the arc-shaped openings 22 communicate with the transverse movement perforations 17, and the arc-shaped openings 22 are in clearance fit with the vertical driving rods 21.

[0041]

[0042] Abutting planes 23 are arranged on the lower end surfaces of the two limiting sliding rods 19. The setting position of the abutting planes 23 is at a lower position and does not exceed one-fourth of the height of the limiting sliding rods 19.

[0043] The first sealing member includes a first inclined hole 24 opened on the valve body 1 and communicating with the sliding perforation 10. A first inclined block 25 is arranged on the peripheral side of the upper end of the U-shaped seat 11, and the first inclined block 25 is an elastic block. The first inclined block 25 is a rubber block or a silica gel block. The first inclined hole 24 is in clearance fit with the first inclined block 25. The inclination angle of the first inclined hole 24 is the same as the inclination angle of the first inclined block 25. The first inclined hole 24 is a rectangular inclined hole, and the first inclined block 25 is also a rectangular inclined block. The first inclined block 25 is fixedly installed on the peripheral side of the U-shaped seat 11 by glue or adhesive.

[0043] ​One end of the cleaning block 15 is fixedly arranged on one side of the closing plate 14, the other end of the cleaning block 15 is arranged to incline downward, and the other end of the cleaning block 15 abuts against the side end face of the filter net 12. The cleaning block 15 is a rubber block or a nylon block. An avoidance opening is opened upward on the lower end face of the cleaning block 15. One end of the cleaning block 15 is fixedly installed on one side of the closing plate 14 by adhesion.

[0044] The locking member includes a locking seat 26 arranged on the upper end face of the U-shaped seat 11 and located on one side of the closing plate 14, a threaded hole 27 opened on the locking seat 26, a corresponding card hole 28 opened on the closing plate 14 for corresponding to the position of the threaded hole 27 after the closing plate 14 rises to a predetermined position within the plate-shaped opening 13, and a locking bolt 29 threadedly connected to the locking seat 26 and located within the threaded hole 27 for engaging with the corresponding card hole 28 after the positions of the corresponding card hole 28 and the threaded hole 27 correspond. The screw part of the locking bolt 29 has a clearance fit with the corresponding card hole 28.

[0045] The locking bolt 29 can be an internal hexagonal bolt or an external hexagonal bolt. The locking bolt 29 is controlled by an internal hexagonal wrench.

[0046] The second sealing member includes a second inclined hole 30 opened on the lower end face of the U-shaped seat 11 and communicating with the plate-shaped opening 13. A connecting frame plate 32 is arranged on the peripheral side of the closing plate 14. The connecting frame plate 32 is located above the cleaning block 15. A second inclined block 31 is arranged on the upper end face of the connecting frame plate 32. The second inclined block 31 is an elastic block. The second inclined block 31 is a rubber block or a silica gel block. The second inclined hole 30 has a clearance fit with the second inclined block 31. The inclination angle of the second inclined hole 30 is the same as the inclination angle of the second inclined block 31. The second inclined hole 30 is a rectangular inclined hole, and the second inclined block 31 is also a rectangular inclined block. The second inclined block 31 is fixedly installed on the upper end of the connecting frame plate 32 by glue or adhesive.

[0047] Working principle of the present invention: When the gate valve is applied to the application scenarios where the medium in the sewage treatment or water supply system contains impurities, the medium enters from the inlet end 2 and passes through the medium perforation 9 through the mounting plate 7. At this time, the filter screen 12 filters the impurities in the medium, so that the filtered impurities flow out towards the outlet end 3, and it is not easy for some impurities in the medium to adhere to the gate plate 6. After long-term use, it is not easy to affect the sealing performance of the gate plate 6 for the valve. When it is necessary to clean the impurities on the filter screen 12, first control the medium to stop entering the inlet end 2, and control the gate plate 6 to close and seal the valve. Then, unscrew the locking bolt 29 to disengage it from the corresponding card hole 28, so as to release the fixing of the closing plate 14 on the U-shaped seat 11, and push the closing plate 14 to descend in the plate-shaped opening 13. During the descent of the closing plate 14, the cleaning block 15 follows the closing plate 14 to descend, so that the other end of the cleaning block 15 scrapes down the impurities on the surface of the filter screen 12 until the lower end of the closing plate 14 abuts against the U-shaped seat 11. At this time, the scraped impurities accumulate in the space between the lower end of the cleaning block 15, the U-shaped seat 11 and the closing plate 14, so as to collect the scraped impurities. Then, pull the vertical driving rod 21 to drive the limit sliding rod 19 to slide away from the square slot 18 in the transverse translation perforation 17 until the U-shaped seat 11 is released from the lifting opening 8 and the sliding perforation 10, and then lift the U-shaped seat 11 out of the lifting opening 8 and the sliding perforation 10. Then, pull the closing plate 14 to rise in the plate-shaped opening 13, so as to process the scraped impurities and perform secondary cleaning on the filter screen 12. The impurities can be cleaned without disassembling the valve body 1. The cleaning process of the filter screen 12 is relatively simple, which can improve the filtering effect of the filter screen 12 on the impurities and reduce the phenomenon of impurity blockage of the filter screen 12;

[0048] When the filter screen 12 needs to be installed on the mounting plate 7, the U-shaped seat 11 is inserted into the lifting opening 8 through the sliding perforation 10 until the U-shaped seat 11 abuts against the mounting plate 7. At this time, by pulling the vertical driving rod 21, the limiting slide rod 19 is driven to move towards the U-shaped seat 11 in the transverse movement perforation 17 until the limiting slide rod 19 is engaged into the square slot 18. The contact plane 23 contacts the lower plane of the square slot 18. At this time, the position of the vertical driving rod 21 corresponds to that of the arc-shaped opening 22. The vertical driving rod 21 is pushed into the arc-shaped opening 22, thereby driving the limiting slide rod 19 to rotate in the transverse movement perforation 17, so that the arc surface of the limiting slide rod 19 further presses the lower plane of the square slot 18 to further press down the U-shaped seat 11 and improve the fixing effect on the U-shaped seat 11. At this time, the first inclined block 25 presses on the first inclined hole 24, thereby sealing the gap between the U-shaped seat 11 and the sliding perforation 10. Then, the closing plate 14 is pulled up in the plate-shaped opening 13 to prevent the closing plate 14 from affecting the flow of the medium in the medium perforation 9. After pulling the closing plate 14 up to the limiting position, the corresponding card hole 28 corresponds to the position of the threaded hole 27. The locking bolt 29 is screwed to abut against the closing plate 14 in the corresponding card hole 28, thereby fixing the closing plate 14 on the U-shaped seat 11 to prevent the closing plate 14 from descending in the plate-shaped opening 13, and the gap between the closing plate 14 and the plate-shaped opening 13 is sealed by the extrusion of the second inclined block 31 and the second inclined hole 30.

[0049] What the present invention aims to protect is the structure of the product. The models of each component are not the content protected by the present invention and are also well-known technologies. Any components that can achieve the above functions of the present invention on the market can be selected and applied as the valve body cover integrated gate valve. Therefore, the parameters such as the model of the components are not described in detail in the present invention. The contribution of the present invention lies in the scientific combination of each component.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and descriptions only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents. Those parts not described in detail in the present invention are all well-known technologies in the art.

Claims

1. The integral valve body cover gate valve includes a valve body, an inlet end and an outlet end provided on the valve body, a valve cover provided on the valve body, a valve stem that is liftably provided on the valve cover and located inside the valve body, and a gate plate provided at the lower end of the valve stem, and is characterized in that: It further includes a mounting plate disposed on the valve body at the inlet end, a lifting opening formed in the mounting plate, a medium perforation formed in the mounting plate and communicating with the lifting opening for allowing the medium to pass through the mounting plate, a sliding perforation formed in the valve body and communicating with the lifting opening, a U-shaped seat that can be lifted and is disposed between the valve body and the gate plate and located in the lifting opening and the sliding perforation, a filter screen disposed on the U-shaped seat for filtering impurities in the medium when the medium passes through the mounting plate from the medium perforation, a fixing mechanism disposed between the upper end of the U-shaped seat and the valve body for fixing or releasing the fixing of the U-shaped seat in the lifting opening and the sliding perforation, a first sealing member disposed between the upper end of the U-shaped seat and the valve body and located in the sliding perforation for sealing the gap between the U-shaped seat and the sliding perforation when the fixing mechanism fixes the U-shaped seat in the lifting opening and the sliding perforation, a plate-shaped opening longitudinally formed in the U-shaped seat, a closing plate that can be lifted and is disposed in the plate-shaped opening of the U-shaped seat, a cleaning block disposed on the side end face of the closing plate for scraping off some impurities on the surface of the filter screen when the closing plate descends in the plate-shaped opening, a locking member disposed between the upper end of the closing plate and the U-shaped seat for fixing or releasing the fixing of the closing plate on the U-shaped seat after the closing plate ascends in the plate-shaped opening, and a second sealing member disposed between the closing plate and the U-shaped seat for sealing the gap between the closing plate and the plate-shaped opening after the locking member fixes the closing plate on the U-shaped seat.

2. The integrated valve body cover gate valve according to claim 1, characterized in that: The upper end of the U-shaped seat passes through the sliding perforation and is located outside the valve body. The fixing mechanism includes two fixing seats disposed on the valve body and located on the left and right sides of the upper end of the U-shaped seat, two transverse movement perforations horizontally penetrating through the two fixing seats, two square slots formed in the left and right ends of the U-shaped seat for corresponding to the positions of the transverse movement perforations when the U-shaped seat descends to a predetermined position, two limiting sliding rods respectively slidably disposed on the two fixing seats and located in the transverse movement perforations for engaging with the square slots when the positions of the square slots and the transverse movement perforations correspond, two driving openings respectively horizontally formed on the upper end faces of the two fixing seats and communicating with the transverse movement perforations, and two vertical driving rods respectively vertically disposed on the two limiting sliding rods and having a clearance fit with the driving openings.

3. The valve body cover integrated globe valve according to claim 2, characterized in that: Arc-shaped openings are respectively formed on the upper end faces of the two fixing seats. The arc-shaped openings communicate with the driving openings, the arc-shaped openings communicate with the transverse movement perforations, and the arc-shaped openings have a clearance fit with the vertical driving rods.

4. The integrated valve body cover gate valve according to claim 3, characterized in that: The lower end faces of the two limiting sliding rods are provided with abutting planes.

5. The integrated valve body cover gate valve according to claim 1, wherein: The first sealing member includes a first inclined hole formed in the valve body and communicating with the sliding perforation. A first inclined block is disposed on the peripheral side of the upper end of the U-shaped seat, and the first inclined block is an elastic block.

6. The integrated valve body cover gate valve according to claim 1, characterized in that: One end of the cleaning block is fixedly disposed on one side of the closing plate. The other end of the cleaning block is inclined downward, and the other end of the cleaning block abuts against the side end face of the filter screen.

7. The integrated valve body cover gate valve according to claim 1, wherein: The locking member includes a locking seat disposed on the upper end surface of the U-shaped seat and located on one side of the closing plate, a threaded hole opened on the locking seat, a corresponding card hole opened on the closing plate for corresponding to the position of the threaded hole after the closing plate rises to a predetermined position within the plate-shaped opening, and a locking bolt threadedly connected to the locking seat within the threaded hole for engaging with the corresponding card hole after the positions of the corresponding card hole and the threaded hole correspond to each other. The screw portion of the locking bolt has a clearance fit with the corresponding card hole.

8. The integrated valve body cover gate valve according to claim 1, characterized in that: The second sealing member includes a second inclined hole opened on the lower end surface of the U-shaped seat and communicating with the plate-shaped opening. A connecting frame plate is provided on the peripheral side of the closing plate. The connecting frame plate is located above the cleaning block. A second inclined block is provided on the upper end surface of the connecting frame plate. The second inclined block is an elastic block.

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