Channel drainage pressure reduction check valve and operation method

Abstract

The invention belongs to the technical field of channel drainage, and particularly discloses a channel drainage pressure reduction check valve and an operation method.The channel drainage pressure reduction check valve comprises an outer sleeve, square pipes are fixedly installed on the two sides of the outer sleeve, an inner sleeve is movably installed in the outer sleeve, and sliding grooves are formed in the square pipes; a matching mechanism is installed in the outer sleeve and in cooperation with the interiors of the two sliding grooves, the matching mechanism comprises sliding blocks and a plugging ring, first connecting columns are symmetrically installed at the two ends of the plugging ring, and the plugging ring is connected with the two sliding blocks through the first connecting columns at the two ends correspondingly; a cover plate is arranged on the outer side of the outer sleeve, and side plates are fixedly installed on the two sides of the cover plate. By means of the matching mechanism, the inner sleeve can be fixed and supported, the inner pipeline is prevented from moving or deforming, and in the installation process, the position of the inner pipeline can be rapidly adjusted and positioned, so that the inner pipeline is located at the optimal position.

Description

Technical Field

[0001] The invention belongs to the field of channel drainage, and specifically discloses a channel drainage pressure reducing check valve and an operating method. Background Art

[0002] In order to reduce leakage losses and improve irrigation efficiency, the channel must be protected by concrete lining. The anti-seepage of channel concrete lining is one of the most commonly used water-saving irrigation engineering technical measures in my country's irrigation areas. However, after the canal section along the mountain or excavated is protected, in the rainy season or rainstorm, the groundwater outside the channel is blocked by the concrete protective layer and cannot be discharged in time, causing the groundwater level outside the channel to rise, often causing the lower part of the concrete protective layer and the bottom plate to crack and bubble, and even cause landslides in severe cases. Especially for rectangular channels, the squeezing of groundwater causes the protective layer to separate from the channel slope and tilt and overturn into the channel. The project installed a drainage pipe or reserved a drainage hole on the slope inside the channel, and set a channel drainage pressure reducing check valve inside the drainage hole. The channel drainage check valve can control the one-way flow of fluid in the pipeline, playing an important role in the channel, ensuring the safe operation of the channel and the water delivery efficiency.

[0003] The existing channel drainage pressure reducing check valve has an inner pipe that is very easy to move or deform under the action of water pressure. At the same time, during the installation process, the position of the inner pipe cannot be quickly located, and the installation process is relatively complicated. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a channel drainage pressure reducing check valve and an operating method to solve the problems in the prior art that the inner pipe is very easy to move or deform under the action of water pressure, and the position of the inner pipe cannot be quickly located during the installation process, resulting in a relatively complicated installation process.

[0005] To achieve the above objectives, the present invention provides a channel drainage pressure reducing check valve, comprising an outer sleeve, square tubes are fixedly installed on both sides of the outer sleeve, an inner sleeve is movably installed inside the outer sleeve, a slide groove is provided inside the square tube, a matching mechanism is arranged inside the outer sleeve and the interior of the two slide grooves, the matching mechanism comprises a sliding block and a sealing ring, the sealing ring is movably installed in the outer sleeve, the sliding block is slidably installed in the slide groove, first connecting columns are symmetrically installed at both ends of the sealing ring, the sealing ring is respectively connected to the two sliding blocks through the first connecting columns at both ends, the inner sleeve cooperates with the matching mechanism, a cover plate is arranged on the outside of the outer sleeve, and side plates are fixedly installed on both sides of the cover plate.

[0006] In the above technical solution, preferably, a positioning cross is installed on the inner wall of the inner sleeve and at one end close to the outlet, a stainless steel mesh is provided on the surface of the positioning cross, a spring is installed in the middle of the positioning cross, a pressure plate is installed at the other end of the spring, a positioning disk is provided at the middle end of the inner wall of the inner sleeve, a through hole is provided in the middle of the positioning disk, the pressure plate corresponds to the through hole, a filter tube is fixedly installed on the other end of the inner wall of the inner sleeve, and the surface of the filter tube is on the outside of the inner sleeve, a water inlet hole is provided on the end face of the filter tube, and the surface of the water inlet hole is wrapped with geotextile.

[0007] In the above technical scheme, preferably, a guide rod is provided inside the slide groove, and inclined blocks are fixedly installed above and below the guide rod, and a guide groove is provided in the middle of the sliding block, and the guide groove is movably inserted into the surface of the guide rod, and limiting grooves are provided inside the sliding block and above and below the guide groove, and the limiting groove cooperates with the inclined block, and the inclined block is inserted in the limiting groove, and a plug-in plate is installed in the middle of the limiting groove, and the surface of the plug-in plate movably passes through the sliding block, and the end of the plug-in plate located inside the limiting groove is provided with an inclined surface, and the inclined surface cooperates with the inclined block, and a clamping plate is installed at the end of the plug-in plate, and the end of the clamping plate is clamped on the outer surface of the inner sleeve, and the length of the slide groove is smaller than the length of the outer sleeve.

[0008] In the above technical scheme, preferably, a through groove is provided through the middle end of the sealing ring, and the through groove cooperates with the water inlet hole. An inner groove is opened inside the sealing ring, and a swivel is rotatably installed on the inner wall of the inner groove. Racks are provided at the upper and lower ends of the inner wall of the swivel, and two gears are symmetrically arranged inside the inner groove, and the two gears are respectively meshed with the two racks. A connecting strip is fixedly installed at the middle end of the top of the gear, and semicircular plates are fixedly provided at the ends of the connecting strip, and the two semicircular plates correspond to each other, and the two semicircular plates cooperate with the through groove, and second connecting columns are fixedly installed at the upper and lower ends of the surface of the swivel, and matching grooves are opened at the upper and lower ends of the sealing ring, and the second connecting column movably passes through the matching groove, and two clamping frames are symmetrically installed on the outer surface of the filter tube, and the two clamping frames are respectively matched with the two second connecting columns.

[0009] In the above technical solution, preferably, a positioning ring is fixedly installed on the surface of the cover plate close to the outer sleeve, and the inner diameter of the positioning ring corresponds to the outer diameter of the inner sleeve.

[0010] In the above technical solution, preferably, a sleeve is fixedly mounted on the surface of the side plate close to the square tube, and the sleeve cooperates with the guide rod.

[0011] In the above technical solution, preferably, a water outlet hole is provided on the bottom surface of the cover plate, and the water outlet hole is located in the positioning ring.

[0012] A method for operating a channel drainage pressure reducing check valve, the method steps are as follows: S1. First, the staff puts the end of the filter tube close to the surface of the plugging ring. At this time, the filter tube is between the two first connecting columns and the two second connecting columns, and the through groove at the end of the filter tube corresponds to the water inlet hole; S2, plug the matching mechanism into the outer sleeve and the two square tubes, then the two sliding blocks are respectively plugged and installed in the two square tubes, and the plugging ring is plugged into the outer sleeve. When the end face of the sliding block is close to the deepest part of the square tube, the end of the plugging ring is in the same plane as the end face of the inner sleeve, and at this time, under the squeezing effect of the inclined block on the plug-in plate, the clamping plate can extend outward, so that the end face of the clamping plate can be close to the surface of the inner sleeve, and under the action of the two clamping plates, the inner sleeve can be clamped and fixed; S3. When the staff rotates the inner casing clockwise, the second connecting column will drive the rotating ring to rotate under the cooperation of the clamping frame and the second connecting column. At this time, the two racks will drive the two gears to rotate at the same time. When the two gears rotate, the connecting strip will drive the semicircular plate to rotate sideways. At this time, the through groove in the middle of the plugging ring will not be blocked by the two semicircular plates, so that groundwater can flow from the through groove to the inner casing; S4. The cover plate and the side plate are installed on the end surface of the outer casing by bolts to achieve the sealing operation of the outer casing.

[0013] Compared with the prior art, the present invention has the following beneficial effects: with the cooperation of the outer casing, the matching mechanism and the inner casing, groundwater can be effectively discharged, the concrete masonry anti-seepage layer is effectively protected, damage is greatly reduced, the service life of the project is extended, and a large amount of project repair and maintenance and repeated construction costs are saved. At the same time, under the action of the matching mechanism, the inner casing can be fixed and supported to prevent the inner pipe from moving or deforming. During the installation process, the installation is simple and convenient, and the position of the inner pipe can be quickly adjusted and positioned so that the inner pipe is in the best position. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the structure of the present invention; Figure 3 For the present invention Figure 2 Another perspective structural diagram; Figure 4 It is a schematic diagram of the internal structure of the inner sleeve of the present invention; Figure 5It is a schematic diagram of the top view of the outer sleeve structure of the present invention; Figure 6 It is a schematic diagram of the internal structure of the blocking ring of the present invention; Figure 7 For the present invention Figure 2 Enlarged view of point A in the middle.

[0015] In the figure: 1. outer sleeve; 2. square tube; 3. inner sleeve; 4. slide groove; 5. matching mechanism; 6. guide rod; 7. sliding block; 8. inclined block; 9. plug-in plate; 10. clamping plate; 11. first connecting column; 12. sealing ring; 13. through groove; 14. inner groove; 15. swivel; 16. gear; 17. connecting strip; 18. semicircular plate; 19. rack; 20. second connecting column; 21. matching groove; 22. positioning cross; 23. spring; 24. pressure plate; 25. positioning plate; 26. filter tube; 27. snap-on frame; 28. cover plate; 29. ​​side plate; 30. sleeve; 31. positioning ring; 32. water outlet. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] like Figure 1 - Figure 7 The channel drainage pressure reducing check valve shown in the figure comprises an outer sleeve 1, square tubes 2 are fixedly installed on both sides of the outer sleeve 1, an inner sleeve 3 is movably installed inside the outer sleeve 1, a slide groove 4 is opened inside the square tube 2, a matching mechanism 5 is arranged inside the outer sleeve 1 and inside the two slide grooves 4, the matching mechanism 5 comprises a sliding block 7 and a blocking ring 12, the blocking ring 12 is movably installed in the outer sleeve 1, the sliding block 7 is slidably installed in the slide groove 4, first connecting columns 11 are symmetrically installed at both ends of the blocking ring 12, and the blocking ring 12 is respectively connected to the two sliding blocks 7 through the first connecting columns 11 at both ends. The inner sleeve 3 cooperates with the matching mechanism 5, a cover plate 28 is provided on the outside of the outer sleeve 1, and side plates 29 are fixedly installed on both sides of the cover plate 28. The matching mechanism 5 is inserted into the outer sleeve 1 and the two square tubes 2. At this time, the two sliding blocks 7 are respectively inserted and installed in the two square tubes 2, and the sealing ring 12 is inserted into the outer sleeve 1. Under the mutual cooperation of the outer sleeve 1, the matching mechanism 5 and the inner sleeve 3, the groundwater can be effectively discharged, and the concrete protective masonry anti-seepage layer is effectively protected. At the same time, under the action of the matching mechanism 5, the stability and safety of the inner sleeve 3 during the working process are also guaranteed.

[0019] A positioning cross 22 is installed on the inner wall of the inner sleeve 3 and at one end close to the outlet. A stainless steel mesh is provided on the surface of the positioning cross 22. A spring 23 is installed in the middle of the positioning cross 22. A pressure plate 24 is installed on the other end of the spring 23. A positioning disk 25 is provided at the middle end of the inner wall of the inner sleeve 3. A through hole is provided in the middle of the positioning disk 25. The pressure plate 24 corresponds to the through hole. A filter tube 26 is fixedly installed on the other end of the inner wall of the inner sleeve 3, and the surface of the filter tube 26 is located on the outside of the inner sleeve 3. A water inlet hole is provided on the end face of the filter tube 26. The surface of the water inlet hole is wrapped with an outer geotextile. The groundwater is filtered through the outer geotextile, and then the groundwater flows from the filter tube 26 to the inside of the inner sleeve 3. A spring 23 with pre-pressure is installed between the pressure plate 24 and the positioning cross 22. The pressure plate 24 is automatically pushed open when subjected to a slight water pressure difference, and the groundwater is discharged into the channel along the gap. This design can effectively discharge groundwater without affecting the anti-seepage of the channel.

[0020] A guide rod 6 is provided inside the slide 4, and an inclined block 8 is fixedly installed above and below the guide rod 6. A guide groove is provided in the middle of the sliding block 7, and the guide groove is movably plugged into the surface of the guide rod 6. A limiting groove is provided inside the sliding block 7 and above and below the guide groove. The limiting groove cooperates with the inclined block 8, and the inclined block 8 is plugged into the limiting groove. A plug-in plate 9 is installed in the middle of the limiting groove, and the surface of the plug-in plate 9 movably penetrates the sliding block 7. An inclined surface is provided at one end of the plug-in plate 9 inside the limiting groove, and the inclined surface cooperates with the inclined block 8. A clamping plate 10 is installed at the end of the plug-in plate 9, and the end of the clamping plate 10 is clamped on the outer surface of the inner sleeve 3. The length of the slide 4 is less than the length of the outer sleeve 1. After the matching mechanism 5 and the inner sleeve 3 are installed inside the outer sleeve 1, when the end face of the sliding block 7 is close to the deepest part of the square tube 2, the end of the sealing ring 12 is in the same plane with the end face of the outer sleeve 1, and at this time, under the squeezing effect of the inclined block 8 on the plug-in plate 9, the clamping plate 10 can extend outward, so that the end face of the clamping plate 10 can be close to the surface of the inner sleeve 3. Under the action of the two clamping plates 10, the inner sleeve 3 can be clamped and fixed, so that the device can ensure the stability of the inner sleeve 3 inside the outer sleeve 1, and avoid the shaking of the inner sleeve 3 during work. At the same time, under the action of the matching mechanism 5, the installation and disassembly of the inner sleeve 3 is also very convenient.

[0021] A through groove 13 is provided at the middle end of the sealing ring 12, and the through groove 13 cooperates with the water inlet hole. Groundwater can flow to the water inlet hole through the through groove 13, and then flow into the filter tube 26 from the water inlet hole. An inner groove 14 is provided inside the sealing ring 12, and a swivel 15 is rotatably installed on the inner wall of the inner groove 14. Racks 19 are provided at the upper and lower ends of the inner wall of the swivel 15. Two gears 16 are symmetrically arranged inside the inner groove 14, and the two gears 16 are respectively meshed with the two racks 19. A connecting strip 17 is fixedly installed at the middle end of the top of the gear 16, and a semicircular plate 18 is fixedly provided at the end of the connecting strip 17. The two semicircular plates 18 correspond to each other, and the two semicircular plates 18 cooperate with the through groove 13. Second connecting columns 20 are fixedly installed at the upper and lower ends of the surface of the swivel 15. The upper and lower ends of the sealing ring 12 A matching groove 21 is provided, and the second connecting column 20 movably passes through the matching groove 21. Two clamping frames 27 are symmetrically installed on the outer surface of the filter tube 26. The two clamping frames 27 are respectively matched with the two second connecting columns 20. The through groove 13 is closed by two semicircular plates 18, which can prevent direct leakage of groundwater. When the staff rotates the inner sleeve 3 clockwise, under the cooperation of the clamping frame 27 and the second connecting column 20, the second connecting column 20 will drive the rotating ring 15 to rotate. At this time, the two racks 19 will simultaneously drive the two gears 16 to rotate. When the two gears 16 rotate, the connecting strip 17 will drive the semicircular plate 18 to rotate sideways. At this time, the through groove 13 in the middle of the sealing ring 12 will not be blocked by the two semicircular plates 18, so that groundwater can flow from the through groove 13 to the inner sleeve 3.

[0022] A positioning ring 31 is fixedly installed on the surface of the cover plate 28 close to the outer sleeve 1. The inner diameter of the positioning ring 31 corresponds to the outer diameter of the inner sleeve 3. Under the action of the positioning ring 31, when the cover plate 28 is sealed on the surface of the outer sleeve 1, the end of the inner sleeve 3 is inserted into the positioning ring 31. The positioning ring 31 can further ensure the stability and safety of the inner sleeve 3 during use, and the groundwater discharged from the inner sleeve 3 can flow into the positioning ring 31.

[0023] A sleeve 30 is fixedly installed on the surface of the side plate 29 close to the square tube 2. The sleeve 30 cooperates with the guide rod 6. When the end face of the square tube 2 is sealed, the sleeve 30 has a squeezing effect on the sliding block 7 to ensure the stability of the sliding block 7 inside the slide groove 4, while also improving the protection of the matching mechanism 5 to the inner sleeve 3.

[0024] A water outlet hole 32 is provided on the bottom surface of the cover plate 28 . The water outlet hole 32 is located in the positioning ring 31 . Groundwater flowing into the positioning ring 31 will be discharged from the water outlet hole 32 .

[0025] A method for operating a channel drainage pressure reducing check valve, the method steps are as follows: S1. First, the staff brings the end of the filter tube 26 close to the surface of the sealing ring 12. At this time, the filter tube 26 is between the two first connecting columns 11 and the two second connecting columns 20, and the through groove 13 at the end of the filter tube 26 corresponds to the water inlet hole; S2, plug the matching mechanism 5 into the outer sleeve 1 and the two square tubes 2, at this time, the two sliding blocks 7 are respectively plugged and installed in the two square tubes 2, and the blocking ring 12 is plugged into the outer sleeve 1. When the end face of the sliding block 7 is close to the deepest part of the square tube 2, the end of the blocking ring 12 is in the same plane as the end face of the outer sleeve 1, and at this time, under the squeezing effect of the inclined block 8 on the plug-in plate 9, the clamping plate 10 can extend outward, so that the end face of the clamping plate 10 can be close to the surface of the inner sleeve 3, and under the action of the two clamping plates 10, the inner sleeve 3 can be clamped and fixed; S3. When the staff rotates the inner casing 3 clockwise, the second connecting column 20 drives the rotating ring 15 to rotate under the cooperation of the clamping frame 27 and the second connecting column 20. At this time, the two racks 19 drive the two gears 16 to rotate at the same time. When the two gears 16 rotate, the connecting bar 17 drives the semicircular plate 18 to rotate sideways. At this time, the through groove 13 in the middle of the blocking ring 12 will not be blocked by the two semicircular plates 18, so that the groundwater can flow from the through groove 13 to the inner casing 3; S4. The cover plate 28 and the side plate 29 are installed on the end surface of the outer sleeve 1 by bolts to achieve the plugging operation of the outer sleeve 1.

[0026] Working principle: First, at the location of the sump according to the design requirements, during the masonry construction, a hole that matches the outer casing 1 and the square tubes 2 on both sides is reserved. You can also manually dig a hole that matches it before the concrete of the slope masonry is finally set. Then, after the concrete of the slope masonry is finally set, install the outer casing 1 and square tube 2. The outer wall of the outer casing 1 and square tube 2 and the concrete masonry layer are filled and squeezed densely with expansive cement fine mortar or expansive cement pure slurry. About 3 days after the outer casing is installed, use a tape measure to measure the installation depth to make sure it is sufficient. If not, take out some sand in the hole, or use a wooden stick to press it tightly. If there is space, you can also backfill some sand appropriately. , after the depth is appropriate, wipe the sand and soil on the inside of the outer sleeve clean, and then the inner sleeve 3 of the check valve can be installed. Then the staff will put the end of the filter tube 26 close to the surface of the sealing ring 12. At this time, the filter tube 26 is between the two first connecting columns 11 and the two second connecting columns 20, and the two clamping frames 27 are respectively matched with the two second connecting columns 20. In the next step, the staff will plug the matching mechanism 5 into the outer sleeve 1 and the two square tubes 2. At this time, the two sliding blocks 7 are respectively plugged and installed in the two square tubes 2, and the sealing ring 12 is plugged into the outer sleeve 1. When the end face of the sliding block 7 is close to the deepest part of the square tube 2, the end of the sealing ring 12 is at the end face of the outer sleeve 1. The inner sleeve 3 is in the same plane, and at this time, under the extrusion of the inclined block 8 on the plug-in plate 9, the clamping plate 10 can extend outward, so that the end face of the clamping plate 10 can be close to the surface of the inner sleeve 3. Under the action of the two clamping plates 10, the inner sleeve 3 can be clamped and fixed. At this moment, the two semicircular plates 18 are in a closed state with respect to the through groove 13, which can prevent direct leakage of groundwater. When the staff rotates the inner sleeve 3 clockwise, under the cooperation of the clamping frame 27 and the second connecting column 20, the second connecting column 20 will drive the swivel 15 to rotate. At this time, the two racks 19 will simultaneously drive the two gears 16 to rotate. When the two gears 16 rotate, the connecting strip 17 will drive The semicircular plate 18 rotates to the side, and at this time, the through groove 13 in the middle of the sealing ring 12 will not be blocked by the two semicircular plates 18. Then the staff uses bolts to seal the end face of the outer sleeve 1 with the cover plate 28 and the side plate 29. At this moment, the sleeve 30 has an extrusion effect on the sliding block 7 to ensure the stability of the sliding block 7 inside the slide groove 4, and the positioning ring 31 can be sleeved on the outside of the inner sleeve 3. Finally, the groundwater will flow into the inner sleeve 3 through the through groove 13, and the geotextile is wrapped to filter the groundwater. Then the groundwater flows from the filter tube 26 to the inside of the inner sleeve 3, and a spring 23 with pre-pressure is installed between the pressure plate 24 and the positioning cross 22. The pressure plate 24 is automatically pushed open when subjected to a slight water pressure difference, and the groundwater is discharged into the channel along the gap. This design can effectively discharge groundwater without affecting the anti-seepage of the channel.

[0027] 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 to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A channel drainage pressure reducing check valve, comprising an outer sleeve (1), characterized in that: Square tubes (2) are fixedly installed on both sides of the outer sleeve (1), an inner sleeve (3) is movably installed inside the outer sleeve (1), a slide groove (4) is opened inside the square tube (2), a matching mechanism (5) is arranged inside the outer sleeve (1) to match the insides of the two slide grooves (4), the matching mechanism (5) comprises a sliding block (7) and a blocking ring (12), the blocking ring (12) is movably installed in the outer sleeve (1), the sliding block (7) is slidably installed in the slide groove (4), first connecting columns (11) are symmetrically installed at both ends of the blocking ring (12), the blocking ring (12) is respectively connected to the two sliding blocks (7) through the first connecting columns (11) at both ends, the inner sleeve (3) matches the matching mechanism (5), and a cover plate (28) is arranged on the outside of the outer sleeve (1), and side plates (29) are fixedly installed on both sides of the cover plate (28).

2. A channel drainage pressure reducing check valve according to claim 1, characterized in that: A positioning cross (22) is installed at one end of the inner wall of the inner sleeve (3) close to the outlet, and a stainless steel mesh is provided on the surface of the positioning cross (22). A spring (23) is installed in the middle of the positioning cross (22), and a pressure plate (24) is installed at the other end of the spring (23). A positioning plate (25) is provided at the middle end of the inner wall of the inner sleeve (3), and a through hole is provided in the middle of the positioning plate (25). The pressure plate (24) corresponds to the through hole. A filter tube (26) is fixedly installed at the other end of the inner wall of the inner sleeve (3), and the surface of the filter tube (26) is located outside the inner sleeve (3). A water inlet hole is provided on the end surface of the filter tube (26), and the surface of the water inlet hole is wrapped with an outer geotextile.

3. A channel drainage pressure reducing check valve according to claim 2, characterized in that: A guide rod (6) is arranged inside the slide groove (4), and inclined blocks (8) are fixedly installed above and below the guide rod (6). A guide groove is arranged in the middle of the sliding block (7), and the guide groove is movably plugged into the surface of the guide rod (6). Limiting grooves are arranged inside the sliding block (7) and above and below the guide groove. The limiting grooves match the inclined blocks (8), and the inclined blocks (8) are plugged into the limiting grooves. A plug-in board (9) is arranged in the middle of the limiting groove, and the surface of the plug-in board (9) movably passes through the sliding block (7). An inclined surface is arranged at one end of the plug-in board (9) located inside the limiting groove, and the inclined surface matches the inclined block (8). A clamping plate (10) is arranged at the end of the plug-in board (9), and the end of the clamping plate (10) is clamped on the outer surface of the inner sleeve (3). The length of the slide groove (4) is less than the length of the outer sleeve (1).

4. A channel drainage pressure reducing check valve according to claim 3, characterized in that: A through groove (13) is provided through the middle end of the sealing ring (12), and the through groove (13) cooperates with the water inlet hole. An inner groove (14) is provided inside the sealing ring (12), and a swivel (15) is rotatably mounted on the inner wall of the inner groove (14). Racks (19) are provided at both the upper and lower ends of the inner wall of the swivel (15). Two gears (16) are symmetrically arranged inside the inner groove (14), and the two gears (16) are respectively meshed with the two racks (19). A connecting strip (17) is fixedly mounted on the middle end of the top of the gear (16), and the connecting strip (17) is fixedly mounted on the middle end of the top of the gear (16). A semicircular plate (18) is fixedly provided at the end of the filter tube (7), the two semicircular plates (18) correspond to each other, and the two semicircular plates (18) match with the through groove (13), the upper and lower ends of the surface of the rotating ring (15) are fixedly installed with second connecting columns (20), the upper and lower ends of the sealing ring (12) are provided with matching grooves (21), the second connecting column (20) movably passes through the matching grooves (21), and the outer surface of the filter tube (26) is symmetrically installed with two clamping frames (27), and the two clamping frames (27) respectively match with the two second connecting columns (20).

5. A channel drainage pressure reducing check valve according to claim 2, characterized in that: A positioning ring (31) is fixedly mounted on the surface of the cover plate (28) close to the outer sleeve (1); the inner diameter of the positioning ring (31) corresponds to the outer diameter of the inner sleeve (3).

6. A channel drainage pressure reducing check valve according to claim 3, characterized in that: A sleeve (30) is fixedly mounted on the surface of the side plate (29) close to the square tube (2), and the sleeve (30) cooperates with the guide rod (6).

7. A channel drainage pressure reducing check valve according to claim 5, characterized in that: A water outlet hole (32) is provided on the bottom surface of the cover plate (28), and the water outlet hole (32) is located inside the positioning ring (31).

8. A method for operating a canal drainage pressure reducing check valve, using the canal drainage pressure reducing check valve according to claim 4, the method steps are as follows: S1. First, the staff brings the end of the filter tube (26) close to the surface of the sealing ring (12). At this time, the filter tube (26) is located between the two first connecting columns (11) and the two second connecting columns (20), and the through groove (13) at the end of the filter tube (26) corresponds to the water inlet hole; S2, inserting the matching mechanism (5) into the outer sleeve (1) and the two square tubes (2), at which time the two sliding blocks (7) are respectively inserted and installed in the two square tubes (2), and the blocking ring (12) is inserted into the outer sleeve (1). When the end face of the sliding block (7) is close to the deepest part of the square tube (2), the end of the blocking ring (12) is in the same plane as the end face of the outer sleeve (1), and at this time, under the squeezing action of the inclined block (8) on the plug-in plate (9), the clamping plate (10) can extend outward, so that the end face of the clamping plate (10) can be close to the surface of the inner sleeve (3), and under the action of the two clamping plates (10), the inner sleeve (3) can be clamped and fixed; S3. When the staff rotates the inner casing (3) clockwise, the second connecting column (20) drives the rotating ring (15) to rotate under the cooperation of the clamping frame (27) and the second connecting column (20). At this time, the two racks (19) drive the two gears (16) to rotate at the same time. When the two gears (16) rotate, the connecting bar (17) drives the semicircular plate (18) to rotate sideways. At this time, the through groove (13) in the middle of the sealing ring (12) will not be blocked by the two semicircular plates (18), so that groundwater can flow from the through groove (13) into the inner casing (3); S4. The cover plate (28) and the side plate (29) are mounted on the end surface of the outer casing (1) by means of bolts, thereby sealing the outer casing (1).

Images