A channel drainage pressure-reducing check valve and operating method

Abstract

The application belongs to the technical field of channel drainage, and specifically discloses a channel drainage pressure-reducing check valve and an operating method, which comprises an outer sleeve pipe, square pipes are fixedly installed on the two sides of the outer sleeve pipe, an inner sleeve pipe is movably installed in the inner part of the outer sleeve pipe, a sliding groove is formed in the inner part of the square pipe, a matching mechanism is arranged in the inner part of the outer sleeve pipe and matched with 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, the plugging ring is connected with the two sliding blocks through the first connecting columns at the two ends, respectively, a cover plate is arranged on the outer side of the outer sleeve pipe, and side plates are fixedly installed on the two sides of the cover plate. Through the matching mechanism, the inner sleeve pipe can be fixed and supported, the inner pipeline is prevented from moving or deforming, the position of the inner pipeline can be quickly adjusted and positioned during the installation process, and the inner pipeline is in the best position.

Description

Technical Field

[0001] This invention belongs to the field of channel drainage, and specifically discloses a channel drainage pressure reducing check valve and its operation method. Background Technology

[0002] To reduce seepage losses and improve irrigation efficiency, canals must be lined with concrete. Concrete lining for seepage prevention is one of the most widely used water-saving irrigation engineering techniques in my country's irrigation areas. However, after lining sections of canals along mountains or in excavated areas, groundwater outside the canal cannot drain in time during the rainy season or heavy rains due to the obstruction of the concrete lining layer. This causes the groundwater level outside the canal to rise, often resulting in cracking and blistering of the lower part and bottom slab of the concrete lining layer, and in severe cases, even landslides. Especially for rectangular canals, the pressure of groundwater causes the lining layer to detach from the canal slope and tilt and overturn into the canal. To address this, drainage pipes or drainage holes are installed on the inner slope of the canal, and drainage pressure-reducing check valves are installed inside the drainage holes. These check valves control the unidirectional flow of fluid in the pipes and play a crucial role in ensuring the safe operation and water conveyance efficiency of the canals.

[0003] Existing channel drainage pressure reducing check valves are prone to internal pipe movement or deformation under water pressure. Furthermore, the internal pipe position cannot be quickly located during installation, making the installation process quite complex. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a channel drainage pressure reducing check valve and its operation method to solve the problems in the prior art where the inner pipe is easily moved or deformed under water pressure, and the inner pipe cannot be quickly positioned during installation, making the installation process relatively complicated.

[0005] To achieve the above objectives, the present invention provides a channel drainage pressure reducing check valve, comprising an outer sleeve, square tubes fixedly installed on both sides of the outer sleeve, an inner sleeve movably installed inside the outer sleeve, and a sliding groove formed inside the square tube. A mating mechanism is installed inside the outer sleeve and mates with the two sliding grooves. The mating mechanism includes a sliding block and a sealing ring. The sealing ring is movably installed inside the outer sleeve, and the sliding block is slidably installed in the sliding groove. First connecting posts are symmetrically installed at both ends of the sealing ring, and the sealing ring is connected to the two sliding blocks respectively through the first connecting posts at both ends. The inner sleeve mates with the mating mechanism. A cover plate is provided on the outer side 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 near the outlet end, the surface of the positioning cross is provided with a stainless steel mesh, 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 plate is provided in the middle of the inner wall of the inner sleeve, a through hole is provided in the middle of the positioning plate, the pressure plate corresponds to the through hole, a filter tube is fixedly installed at 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 is provided on the end face of the filter tube, and the surface of the water inlet is wrapped with an outer geotextile.

[0007] In the above technical solution, preferably, a guide rod is provided inside the slide groove, and inclined blocks are fixedly installed above and below the guide rod. 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. Limiting grooves are provided inside the sliding block, above and below the guide groove. The limiting grooves cooperate with the inclined blocks, and the inclined blocks are inserted into the limiting grooves. A plug-in plate is installed in the middle of the limiting groove. The surface of the plug-in plate movably penetrates the sliding block. An inclined surface is provided at one end of the plug-in plate inside the limiting groove, and the inclined surface cooperates with the inclined block. A clamping plate is installed at the end of the plug-in plate, and the end of the clamping plate is clamped to the outer surface of the inner sleeve. The length of the slide groove is less than the length of the outer sleeve.

[0008] In the above technical solution, preferably, a through groove is provided through the middle of the sealing ring, the through groove cooperates with the water inlet hole, an inner groove is opened inside the sealing ring, a rotating ring is rotatably installed on the inner wall of the inner groove, a rack is provided at both the upper and lower ends of the inner wall of the rotating ring, two gears are symmetrically arranged inside the inner groove, the two gears mesh with the two racks respectively, a connecting strip is fixedly installed at the middle of the top of the gear, a semi-circular plate is fixedly installed at the end of the connecting strip, the two semi-circular plates are opposite each other and cooperate with the through groove, a second connecting post is fixedly installed at both the upper and lower ends of the rotating ring surface, a mating groove is opened at both the upper and lower ends of the sealing ring, the second connecting post movably passes through the mating groove, and two snap-fit ​​frames are symmetrically installed on the outer surface of the filter tube, the two snap-fit ​​frames cooperate with the two second connecting posts respectively.

[0009] In the above technical solution, preferably, a positioning ring is fixedly installed on the surface of the cover plate near 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 installed on the side plate near the surface of the square tube, and the sleeve cooperates with the guide rod.

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

[0012] An operating method for a channel drainage pressure-reducing check valve, the steps of which are as follows:

[0013] S1. First, the staff will place the end of the filter tube close to the surface of the sealing ring. At this time, the filter tube is between the two first connecting posts and the two second connecting posts, and the through groove at the end of the filter tube corresponds to the water inlet.

[0014] S2. Insert the mating mechanism into the outer tube and the two square tubes. At this time, the two sliding blocks are respectively inserted into the two square tubes, and the sealing ring is inserted into the outer tube. When the end face of the sliding block is close to the deepest part of the square tube, the end of the sealing ring is on the same plane as the end face of the inner tube. At this time, under the squeezing action of the inclined block on the insertion 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 tube. Under the action of the two clamping plates, the inner tube can be clamped and fixed.

[0015] S3. When the staff rotates the inner sleeve clockwise, the second connecting column will drive the rotating ring to rotate under the cooperation of the snap-fit ​​frame and the second connecting column. At this time, the two racks will drive the two gears to rotate simultaneously. When the two gears rotate, the connecting strip will drive the semicircular plate to rotate to the side. At this time, the through groove in the middle of the sealing ring will not be blocked by the two semicircular plates, so that the groundwater can flow from the through groove into the inner sleeve.

[0016] S4. The cover plate and side plate are installed on the end face of the outer tube by bolts to achieve the sealing operation of the outer tube.

[0017] Compared with the prior art, the present invention has the following beneficial effects: with the cooperation of the outer sleeve, the matching mechanism and the inner sleeve, groundwater can be effectively drained, the concrete protective seepage layer is effectively protected, damage is greatly reduced, the service life of the project is extended, and a large amount of project maintenance and repeated construction costs are saved. At the same time, with the action of the matching mechanism, the inner sleeve 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 optimal position. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of the structure of the present invention;

[0020] Figure 3 For the present invention Figure 2 Another perspective structural diagram;

[0021] Figure 4 This is a schematic diagram of the internal structure of the inner sleeve of the present invention;

[0022] Figure 5 This is a top view of the outer sleeve structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the internal structure of the sealing ring of the present invention;

[0024] Figure 7 For the present invention Figure 2 Enlarged view of point A in the middle.

[0025] In the diagram: 1. Outer sleeve; 2. Square tube; 3. Inner sleeve; 4. Slide groove; 5. Mating mechanism; 6. Guide rod; 7. Sliding block; 8. Inclined block; 9. Insert plate; 10. Clamping plate; 11. First connecting post; 12. Sealing ring; 13. Through groove; 14. Inner groove; 15. Rotary ring; 16. Gear; 17. Connecting strip; 18. Semicircular plate; 19. Rack; 20. Second connecting post; 21. Mating groove; 22. Positioning cross; 23. Spring; 24. Pressure plate; 25. Positioning disc; 26. Filter tube; 27. Snap-fit ​​frame; 28. Cover plate; 29. ​​Side plate; 30. Sleeve; 31. Positioning ring; 32. Water outlet. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0028] like Figure 1 - Figure 7The illustrated channel drainage pressure reducing check valve includes an outer sleeve 1, with square tubes 2 fixedly installed on both sides of the outer sleeve 1. An inner sleeve 3 is movably installed inside the outer sleeve 1. The square tubes 2 have internal grooves 4. A mating mechanism 5 is installed inside the outer sleeve 1 and mates with the two grooves 4. The mating mechanism 5 includes sliding blocks 7 and sealing rings 12. The sealing rings 12 are movably installed inside the outer sleeve 1, and the sliding blocks 7 are slidably installed in the grooves 4. First connecting posts 11 are symmetrically installed at both ends of the sealing rings 12, and the sealing rings 12 are connected to the two sliding blocks 7 respectively through the first connecting posts 11 at both ends. The inner sleeve 3 cooperates with the cooperating mechanism 5. The outer sleeve 1 is provided with a cover plate 28, and side plates 29 are fixedly installed on both sides of the cover plate 28. The cooperating 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 into the two square tubes 2. The sealing ring 12 is inserted into the outer sleeve 1. With the cooperation of the outer sleeve 1, the cooperating mechanism 5 and the inner sleeve 3, the groundwater can be effectively discharged, and the concrete protective seepage prevention layer is effectively protected. At the same time, under the action of the cooperating mechanism 5, the stability and safety of the inner sleeve 3 during the working process are also guaranteed.

[0029] A positioning cross 22 is installed on the inner wall of the inner sleeve 3 near the outlet. The surface of the positioning cross 22 is covered with stainless steel mesh. 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 disc 25 is installed in the middle of the inner wall of the inner sleeve 3. A through hole is provided in the middle of the positioning disc 25. The pressure plate 24 corresponds to the through hole. A filter pipe 26 is fixedly installed at the other end of the inner wall of the inner sleeve 3, and the surface of the filter pipe 26 is on the outside of the inner sleeve 3. A water inlet hole is provided on the end face of the filter pipe 26. The surface of the water inlet hole is covered with an outer geotextile. The groundwater is filtered by the outer geotextile. Then the groundwater flows into the interior of the inner sleeve 3 through the filter pipe 26. A spring 23 with preload is installed between the pressure plate 24 and the positioning cross 22. The pressure plate 24 is automatically pushed open under 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 seepage prevention of the channel.

[0030] A guide rod 6 is provided inside the slide groove 4. 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 inserted into the surface of the guide rod 6. Limiting grooves are provided inside the sliding block 7, both above and below the guide groove. The limiting grooves cooperate with the inclined block 8, and the inclined block 8 is inserted into the limiting groove. A connecting plate 9 is installed in the middle of the limiting groove, and the surface of the connecting plate 9 movably passes through the sliding block 7. An inclined surface is provided at one end of the connecting 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 connecting plate 9, and the end of the clamping plate 10 is clamped to 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. After the mating 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 on the same plane as the end face of the outer sleeve 1. At this time, under the squeezing action of the inclined block 8 on the plug 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. Thus, the device can ensure the stability of the inner sleeve 3 inside the outer sleeve 1 and avoid the phenomenon of the inner sleeve 3 shaking during operation. At the same time, under the action of the mating mechanism 5, the installation and disassembly of the inner sleeve 3 are also very convenient.

[0031] A through groove 13 is provided through the middle of the sealing ring 12. The through groove 13 cooperates with the water inlet hole, allowing groundwater to flow through the through groove 13 to the water inlet hole and then into the filter pipe 26. An inner groove 14 is provided inside the sealing ring 12. A rotating ring 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 rotating ring 15. Two gears 16 are symmetrically arranged inside the inner groove 14, meshing with the two racks 19 respectively. A connecting strip 17 is fixedly installed at the middle of the top of the gears 16. A semi-circular plate 18 is fixedly installed at the end of the connecting strip 17. The two semi-circular plates 18 correspond to each other and cooperate with the through groove 13. Second connecting posts 20 are fixedly installed at both the upper and lower ends of the rotating ring 15. The sealing ring 12 has... A mating groove 21 is provided, and the second connecting column 20 moves through the mating groove 21. Two snap-fit ​​frames 27 are symmetrically installed on the outer surface of the filter pipe 26. The two snap-fit ​​frames 27 are respectively mated with the two second connecting columns 20. The through groove 13 is sealed by two semi-circular plates 18, which can prevent groundwater from directly seeping in. When the staff rotates the inner sleeve 3 clockwise, the second connecting column 20 will drive the rotating ring 15 to rotate under the cooperation of the snap-fit ​​frames 27 and the second connecting columns 20. At this time, the two racks 19 will drive the two gears 16 to rotate at the same time. When the two gears 16 rotate, the connecting strip 17 will drive the semi-circular plate 18 to rotate to the side. At this time, the through groove 13 in the middle of the sealing ring 12 will not be blocked by the two semi-circular plates 18, so that the groundwater can flow from the through groove 13 to the inner sleeve 3.

[0032] A positioning ring 31 is fixedly installed on the surface of the cover plate 28 near 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.

[0033] A sleeve 30 is fixedly installed on the side plate 29 near the surface of the square tube 2. The sleeve 30 cooperates with the guide rod 6. When the end face of the square tube 2 is blocked, the sleeve 30 has a squeezing effect on the sliding block 7, ensuring the stability of the sliding block 7 inside the slide groove 4. At the same time, it also improves the protection of the inner sleeve 3 by the cooperating mechanism 5.

[0034] The bottom surface of the cover plate 28 is provided with a water outlet 32, which is located inside the positioning ring 31. The groundwater flowing into the positioning ring 31 will be discharged through the water outlet 32.

[0035] An operating method for a channel drainage pressure-reducing check valve, the steps of which are as follows:

[0036] S1. First, the staff will place 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 posts 11 and the two second connecting posts 20, and the through groove 13 at the end of the filter tube 26 corresponds to the water inlet.

[0037] S2. Insert the mating mechanism 5 into the outer tube 1 and the two square tubes 2. At this time, the two sliding blocks 7 are respectively inserted into the two square tubes 2, and the sealing ring 12 is inserted into the outer tube 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 on the same plane as the end face of the outer tube 1. At this time, under the squeezing action of the inclined block 8 on the insertion 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 tube 3. Under the action of the two clamping plates 10, the inner tube 3 can be clamped and fixed.

[0038] S3. When the staff rotates the inner sleeve 3 clockwise, the second connecting post 20 will drive the rotating ring 15 to rotate under the cooperation of the snap-fit ​​frame 27 and the second connecting post 20. At this time, the two racks 19 will drive the two gears 16 to rotate simultaneously. When the two gears 16 rotate, the connecting strip 17 will drive the semi-circular plate 18 to rotate to the side. At this time, the through groove 13 in the middle of the sealing ring 12 will not be blocked by the two semi-circular plates 18, so that the groundwater can flow from the through groove 13 into the inner sleeve 3.

[0039] S4. The cover plate 28 and the side plate 29 are installed on the end face of the outer sleeve 1 by bolts to achieve the sealing operation of the outer sleeve 1.

[0040] Working principle: First, during the construction of the retaining wall at the location of the sump according to the design requirements, a hole is reserved to match the outer casing 1 and the square tubes 2 on both sides. Alternatively, a matching hole can be manually excavated before the final setting of the concrete for the slope retaining wall. Then, after the final setting of the slope retaining wall concrete, the outer casing 1 and square tubes 2 are installed. The space between the outer wall of the outer casing 1 and square tubes 2 and the concrete retaining layer is filled and compacted with expansive cement fine mortar or expansive cement paste. About 3 days after the outer casing is installed, the depth to be installed is measured with a tape measure to determine if it is sufficient. If not, some sand can be removed from the hole, or it can be compacted with a wooden stick. If there is still too much space, some sand can be backfilled appropriately. After the depth is appropriate, wipe the sand off the inside of the outer sleeve, and then insert the inner sleeve 3 of the check valve. Next, the worker places the end of the filter tube 26 close to the surface of the sealing ring 12. At this point, the filter tube 26 is positioned between the two first connecting posts 11 and the two second connecting posts 20, and the two snap-fit ​​frames 27 are respectively engaged with the two second connecting posts 20. The next step is to insert the engaging mechanism 5 into the outer sleeve 1 and the two square tubes 2. At this point, the two sliding blocks 7 are respectively inserted into the two square tubes 2, and the sealing 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 sealing ring 12 is at the end face of the outer sleeve 1. On the same plane, and under the squeezing action of the inclined block 8 on the plug 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 time, the two semi-circular plates 18 are in a closed state to the through groove 13, which can prevent groundwater from directly seeping in. When the worker rotates the inner sleeve 3 clockwise, under the cooperation of the snap-fit ​​frame 27 and the second connecting post 20, the second connecting post 20 will drive the rotating ring 15 to rotate. At this time, the two racks 19 will drive the two gears 16 to rotate simultaneously. When the two gears 16 rotate, the connecting strip 17 will drive the... The semicircular plate 18 rotates to the side, at which point the through groove 13 in the middle of the sealing ring 12 is not blocked by the two semicircular plates 18. Then, the workers use 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 a squeezing effect on the sliding block 7, ensuring the stability of the sliding block 7 inside the sliding groove 4. The positioning ring 31 can be fitted onto the outside of the inner sleeve 3. Finally, the groundwater will flow into the inner sleeve 3 through the through groove 13. The geotextile wrapping filters the groundwater. Then, the groundwater flows into the interior of the inner sleeve 3 through the filter pipe 26. And by installing a spring 23 with preload between the pressure plate 24 and the positioning cross 22, the pressure plate 24 will automatically open under a slight water pressure difference. The groundwater will be discharged into the channel along the gap. This design can effectively discharge groundwater without affecting the channel's seepage prevention.

[0041] The foregoing has shown and described 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. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A channel drainage pressure reducing non-return valve comprising an outer sleeve (1), characterised in that, Both sides of the outer sleeve (1) are fixedly provided with square tubes (2), the inner side of the outer sleeve (1) is movably provided with an inner sleeve (3), the inner side of the square tube (2) is provided with a sliding groove (4), the inner side of the outer sleeve (1) is movably provided with a matching mechanism (5) matched with the two sliding grooves (4), the matching mechanism (5) comprises a sliding block (7) and a sealing ring (12), the sealing ring (12) is movably arranged in the outer sleeve (1), the sliding block (7) is slidably arranged in the sliding groove (4), both ends of the sealing ring (12) are symmetrically provided with a first connecting column (11), the sealing ring (12) is connected with the two sliding blocks (7) through the first connecting columns (11) at both ends, the inner sleeve (3) is matched with the matching mechanism (5), the outer side of the outer sleeve (1) is provided with a cover plate (28), both sides of the cover plate (28) are fixedly provided with side plates (29). The inner wall of the inner sleeve (3) is provided with a positioning cross (22) close to one end of the outlet, the surface of the positioning cross (22) is provided with a stainless steel mesh, the middle of the positioning cross (22) is provided with a spring (23), the other end of the spring (23) is provided with a pressure bearing plate (24), the middle end of the inner wall of the inner sleeve (3) is provided with a positioning disc (25), the middle of the positioning disc (25) is provided with a through hole, the pressure bearing plate (24) corresponds to the through hole, the other end of the inner wall of the inner sleeve (3) is fixedly provided with a filter pipe (26), and the surface of the filter pipe (26) is on the outer side of the inner sleeve (3), the end surface of the filter pipe (26) is provided with a water inlet hole, and the surface of the water inlet hole is wrapped with an outer wrapping geotextile.

2. A channel drainage pressure-reducing non-return valve according to claim 1, characterized in that The inner side of the sliding groove (4) is provided with a guide rod (6), the upper and lower sides of the guide rod (6) are fixedly provided with inclined blocks (8), the middle of the sliding block (7) is provided with a guide groove, the guide groove is movably inserted into the surface of the guide rod (6), the inner side of the sliding block (7) is provided with a limiting groove above and below the guide groove, the limiting groove is matched with the inclined block (8), the inclined block (8) is inserted into the limiting groove, the middle of the limiting groove is provided with an insertion plate (9), the surface of the insertion plate (9) is movably inserted into the sliding block (7), one end of the insertion plate (9) in the limiting groove is provided with an inclined surface matched with the inclined block (8), the end of the insertion plate (9) is provided with a clamping plate (10), the end of the clamping plate (10) is clamped to the outer surface of the inner sleeve (3), and the length of the sliding groove (4) is less than the length of the outer sleeve (1).

3. A channel drain pressure relief non-return valve according to claim 2, wherein The middle end of the blocking ring (12) is provided with a through groove (13), the through groove (13) is matched with the water inlet hole, the inside of the blocking ring (12) is provided with an inner groove (14), the inner wall of the inner groove (14) is rotatably provided with a rotating ring (15), the upper and lower ends of the inner wall of the rotating ring (15) are provided with a rack (19), the inside of the inner groove (14) is symmetrically provided with two gears (16), the two gears (16) are respectively engaged with the two racks (19), the middle end of the top of the gear (16) is fixedly provided with a connecting strip (17), the end of the connecting strip (17) is fixedly provided with a semicircular plate (18), the two semicircular plates (18) correspond to each other, and the two semicircular plates (18) are matched with the through groove (13), the upper and lower ends of the surface of the rotating ring (15) are fixedly provided with a second connecting column (20), the upper and lower ends of the blocking ring (12) are provided with a matching groove (21), the second connecting column (20) movably penetrates the matching groove (21), and the outer surface of the filter pipe (26) is symmetrically provided with two clamping frames (27). The two clamping frames (27) are respectively matched with the two second connecting columns (20).

4. The channel drain pressure relief check valve according to claim 1, wherein The surface of the cover plate (28) close to the surface of the outer sleeve (1) is fixedly provided with a positioning ring (31), and the inner diameter of the positioning ring (31) corresponds to the outer diameter of the inner sleeve (3).

5. A channel drain pressure relief check valve according to claim 2, wherein The surface of the side plate (29) close to the surface of the square tube (2) is fixedly provided with a sleeve (30), and the sleeve (30) is matched with the guide rod (6).

6. A channel drain pressure relief non-return valve according to claim 4, wherein The bottom end surface of the cover plate (28) is provided with a water outlet hole (32), and the water outlet hole (32) is located in the positioning ring (31).

7. An operating method of a channel drainage pressure reducing check valve, using the channel drainage pressure reducing check valve of claim 3, the method steps are as follows: S1, first, the staff approaches the surface of the blocking ring (12) with the end of the filter pipe (26), at this time, the filter pipe (26) is between the two first connecting columns (11) and the two second connecting columns (20), and the through groove (13) of the end of the filter pipe (26) corresponds to the water inlet hole; S2, 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 into the two square tubes (2), the blocking ring (12) is inserted into the outer sleeve (1), when the end surface of the sliding block (7) approaches the deepest part of the square tube (2), the end of the blocking ring (12) is in the same plane as the end surface of the outer sleeve (1), and at this time, under the extrusion of the inclined block (8) to the insertion plate (9), the clamping plate (10) can extend outward, so that the end surface of the clamping plate (10) can approach 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. S3、When the staff rotates the inner sleeve (3) clockwise, the second connecting column (20) will drive 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) 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 to the side. At this time, the through slot (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 into the inner sleeve (3) from the through slot (13); S4, the cover plate (28) and the side plate (29) are installed on the end face of the outer sleeve (1) by bolts, realizing the plugging operation of the outer sleeve (1).

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