Anti-backflow device for polyurethane sewage pipeline

Abstract

The utility model relates to the technical field of environmental protection equipment, and provides a polyurethane sewage pipeline anti-backflow device which comprises a horizontally arranged pipeline, a lining arranged in the pipeline and a fixing assembly used for fixing the lining in the pipeline, and the lining is made of polyurethane; the lining comprises a pipe body, a fixing head and a sealing ring, the fixing head and the sealing ring are arranged at the two ends of the pipe body respectively, the diameter of the pipe body is gradually reduced in the direction from the sealing ring to the fixing head, the top of the pipe body abuts against the inner top wall of the pipeline, the fixing head abuts against the inner wall of the top of the pipeline, and the fixing head is fixed to the pipeline through a fixing assembly. The lower portion of the pipe body is arranged in an inclined mode to form an extrusion side for water flow extrusion. The outer diameter of the sealing ring is larger than that of the pipe body, and an annular groove for the sealing ring to be attached is formed in the inner circumferential wall of the pipeline in a surrounding mode. The anti-backflow device has the beneficial effects that the anti-backflow effect of the anti-backflow device is improved while the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of water environmental protection equipment, and in particular to a polyurethane sewage pipe backflow preventer. Background Art

[0002] At present, drainage pipes are usually set up underground in cities to drain rainwater in time. Some backflow preventers are set in the drainage pipes to reduce the possibility of backflow. For pipes with backflow prevention requirements, hydraulic down-opening weir gates, duckbill valves and other equipment are mostly used. The hydraulic down-opening weir gates are relatively expensive. If they are only used for the backflow prevention function of the pipeline, it will cause waste. As for the duckbill valve, it is low in cost and has a certain backflow prevention effect. However, during use, it is easy to cause the duckbill valve to fail to completely close, making the backflow prevention effect invalid and unable to meet production needs. Therefore, further improvement is needed. Utility Model Content

[0003] In order to reduce costs while improving the backflow prevention effect of the backflow preventer, the present application provides a polyurethane sewage pipe backflow preventer.

[0004] This application provides a polyurethane sewage pipe backflow preventer, which adopts the following technical solution:

[0005] A polyurethane sewage pipe backflow preventer comprises a horizontally arranged pipe, an inner liner arranged in the pipe and a fixing assembly for fixing the inner liner in the pipe, wherein the inner liner is made of polyurethane; the inner liner comprises a pipe body and a fixing head and a sealing ring respectively arranged at both ends of the pipe body, the diameter of the pipe body gradually decreases from the sealing ring toward the fixing head, the top of the pipe body abuts the inner top wall of the pipe, the fixing head abuts the top inner wall of the pipe, the fixing head is fixed to the pipe by the fixing assembly, the lower part of the pipe body is inclined to form an extrusion side for water flow extrusion; the outer diameter of the sealing ring is larger than the outer diameter of the pipe body, the inner circumferential wall of the pipe is provided with an annular groove for the sealing ring to fit, the top of the sealing ring has a fixing portion fixed to the pipe by the fixing assembly, and the extrusion side close to the sealing ring is provided with a telescopic portion.

[0006] By adopting the above technical solution, when water flows from the end of the pipe body with a relatively small diameter toward the extrusion side, it is a positive flow, thereby applying pressure to the extrusion side, driving the sealing ring to sag upward, widening the gap, and realizing the flow of water. When the water level at the end of the pipe body with a larger diameter is higher than the water level at the end of the pipe body with a smaller diameter, the water flows through the sealing ring and, under the action of the water pressure, causes the sealing ring to gradually adhere to the inner wall of the pipe, thereby preventing backflow. In addition, the inner lining is made of polyurethane, which has a relatively high resilience compared to the rubber backflow preventers in the prior art, and can relatively quickly prevent backflow, thereby reducing costs while improving the backflow prevention function of the backflow preventer.

[0007] Among them, the telescopic part is provided to facilitate reverse water flow through the sealing ring to apply pressure to the extrusion side, thereby increasing the seal between the liner and the pipeline and improving the anti-backflow effect of the liner.

[0008] Preferably, a guide surface is provided at the connection between the telescopic portion and the sealing ring.

[0009] By adopting the above technical solution, when the water flows in the forward direction, it is relatively easy to drive the sealing ring to lift up along the guide surface, thereby reducing the flow impact during the forward water flow.

[0010] Preferably, the telescopic portion includes a plurality of connected folding pieces, and two adjacent folding pieces are staggered and can be bent along the connection.

[0011] By adopting the above technical solution, a plurality of folding sheets are arranged in a staggered manner with two adjacent folding sheets, so that the cross-sections of the plurality of folding sheets are arranged in a broken line, so that the unconnected ends of the two adjacent folding sheets can move in a direction away from or close to each other, so as to realize the expansion and contraction of the telescopic part, thereby changing the area of ​​the extrusion side, and further improving the anti-backflow effect of the reverse water flow in the pipeline.

[0012] Preferably, the connection between adjacent folding sheets is arranged in an arc-shaped chamfer.

[0013] By adopting the above technical solution, the possibility of stress concentration at the connection is reduced, thereby reducing the possibility of damage to the folding sheet at the connection due to repeated folding, thereby reducing the possibility of reduced anti-backflow effect.

[0014] Preferably, both ends of the folding sheet are fixed to form a folding ring, and the distance between the outer peripheral wall of the folding ring at the bottom and the inner wall of the bottom of the pipe gradually increases in the direction away from the sealing ring.

[0015] By adopting the above technical solution, the two ends of the folding sheet itself are fixed to form a folding ring, which is relatively easy to process, and the distance between the outer peripheral wall of the folding ring at the bottom and the inner wall of the bottom of the pipe is gradually increased in the direction away from the sealing ring. For the telescopic part formed by the folding ring of the same width, the height of each crest and trough will be different, which can facilitate the forward water flow to pressurize the upwardly arched folding sheet and make it relatively easy to apply pressure to the reverse water flow to improve the anti-backflow effect.

[0016] Preferably, the length direction of the folded piece is parallel to the inclined direction of the extrusion side.

[0017] By adopting the above technical solution, the length direction of the folding sheet is parallel to the inclined direction of the extrusion side. When the water level of the reverse water flow is higher than the height of the forward water flow, when it passes through the sealing ring to squeeze the extrusion side and the telescopic part, the telescopic part is stretched, thereby changing the diameter of the tube body, so that the part of the tube body close to the sealing ring can abut against the inner wall of the pipe for further sealing, thereby improving the anti-backflow effect of the backflow preventer.

[0018] Preferably, the upper surface of the folded piece is arranged in an arc shape in a direction away from the inner wall of the bottom of the pipe.

[0019] By adopting the above technical solution, the telescopic part is arched toward the defense line of the inner wall of the bottom of the pipe so that the water flow exerts pressure on it to squeeze it upward, reducing the flow of the forward water flow affected by the telescopic part.

[0020] Preferably, the widths of the plurality of foldable pieces gradually decrease from the middle portion toward both sides of the telescopic portion.

[0021] By adopting the above technical solution, a transition connection is performed, which reduces the effect of the fitting between the sealing ring and the inner wall of the pipe due to the excessive width of the end of the telescopic portion.

[0022] In summary, the present invention has the following beneficial effects:

[0023] The polyurethane lining has a higher resilience than conventional rubber backflow preventers, enabling faster backflow prevention. This reduces costs while improving the backflow prevention function. Furthermore, the telescopic portion facilitates reverse water flow through the sealing ring to apply pressure to the extrusion side, thus increasing the seal between the lining and the pipe, thereby enhancing the lining's backflow prevention effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application;

[0025] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A;

[0026] Figure 3 This is a schematic diagram of the overall structure of Example 2 of the present application;

[0027] Figure 4 It is a side view structural diagram of Example 2 of the present application.

[0028] Explanation of the accompanying drawings: 1. Pipe; 11. Ring groove; 2. Liner; 21. Pipe body; 211. Extrusion side; 22. Fixed head; 23. Sealing ring; 3. Fixed assembly; 31. Fixed plate; 32. Bolt; 4. Telescopic part; 41. Folding piece; 5. Guide surface. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 , further details of this application are given.

[0030] The embodiment of the present application discloses a polyurethane sewage pipe backflow preventer.

[0031] Example 1:

[0032] A polyurethane sewage pipe backflow preventer, reference Figure 1 The invention comprises a horizontally arranged pipe 1, an inner liner 2 disposed within the pipe 1, and a fixing assembly 3 for fixing the inner liner 2 within the pipe 1. In this embodiment, the inner liner 2 is made of polyurethane, which has high elasticity, softness, and tensile strength. It can reduce the possibility of breakage caused by obvious creases when repeatedly squeezed by forward and reverse water flows, and can have a relatively long service life.

[0033] The liner 2 includes a pipe body 21, a fixing head 22, and a sealing ring 23, respectively disposed at both ends of the pipe body 21. The diameter of the pipe body 21 gradually decreases from the sealing ring 23 toward the fixing head 22. The top of the pipe body 21 abuts the inner top wall of the pipe 1, and the fixing head 22 abuts the top inner wall of the pipe 1. The fixing head 22 is fixed to the pipe 1 via a fixing assembly 3. The bottom of the pipe body 21 is inclined to form an extrusion side 211 for water flow extrusion. The outer diameter of the sealing ring 23 is larger than that of the pipe body 21. An annular groove 11 is provided around the inner circumferential wall of the pipe 1 for the sealing ring 23 to fit into. The top of the sealing ring 23 has a fixing portion that is fixed to the pipe 1 via the fixing assembly 3.

[0034] Reference Figure 1 、 Figure 2 A telescopic portion 4 is provided on the side of the extrusion side 211 near the sealing ring 23. A guide surface 5 is provided at the connection between the telescopic portion 4 and the sealing ring 23. In this embodiment, the telescopic portion 4 includes a plurality of connected folding pieces 41. Adjacent folding pieces 41 are staggered and can be bent along the connection. The connection between adjacent folding pieces 41 is configured with an arc-shaped chamfer. The two ends of the folding piece 41 are fixed to form a folded ring. The distance between the outer peripheral wall of the folded ring at the bottom and the inner wall of the bottom of the pipe 1 gradually increases in the direction away from the sealing ring 23.

[0035] Among them, the fixing component 3 specifically includes a fixing plate 31 and a bolt 32 that is threadedly connected to the fixing plate 31 and the pipe 1. The fixing plate 31 is arranged in an arc shape. There are two fixing plates 31 and they respectively abut against the inner wall of the sealing ring 23 and the lower surface of the fixing head 22. Several bolts 32 are arranged at intervals along the length direction of the fixing plate 31.

[0036] The embodiment of the present application discloses a polyurethane sewage pipe 1 backflow preventer. The principle of implementation is as follows: the inner lining 2 is made of polyurethane, which has a relatively high resilience compared to the prior art backflow preventers made of rubber, and can prevent backflow relatively quickly, thereby reducing costs while improving the backflow prevention function of the backflow preventer. The telescopic portion 4 is provided to facilitate reverse water flow through the sealing ring 23 to apply pressure to the extrusion side 211, thereby increasing the seal between the inner lining 2 and the pipe 1 after expansion, thereby improving the backflow prevention effect of the inner lining 2.

[0037] Example 2:

[0038] Reference Figure 3 、 Figure 4 The difference from Example 1 is that the length direction of the folded piece 41 is parallel to the inclination direction of the extrusion side 211, and it is located in the middle of the extrusion side 211. The upper surface of the folded piece 41 is arranged in an arc shape away from the bottom inner wall of the pipe 1. The width of the folded pieces 41 gradually decreases from the middle of the telescopic portion 4 toward both sides.

[0039] The length direction of the folding sheet 41 is parallel to the inclined direction of the extrusion side 211. When the water level of the reverse water flow is higher than the height of the forward water flow, it passes through the sealing ring 23 to squeeze the extrusion side 211 and the telescopic part 4, so that the telescopic part 4 is stretched, thereby changing the diameter of the tube body 21, so that the partial tube body 21 close to the sealing ring 23 can abut against the inner wall of the pipe 1 for further sealing, thereby improving the anti-backflow effect of the backflow preventer.

[0040] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A polyurethane sewage pipe backflow preventer, characterized by: The invention comprises a horizontally arranged pipe (1), an inner liner (2) arranged in the pipe (1), and a fixing assembly (3) for fixing the inner liner (2) in the pipe (1), wherein the inner liner (2) is made of polyurethane; the inner liner (2) comprises a pipe body (21) and a fixing head (22) and a sealing ring (23) respectively arranged at both ends of the pipe body (21); the diameter of the pipe body (21) gradually decreases from the sealing ring (23) toward the fixing head (22); the top of the pipe body (21) abuts against the inner top wall of the pipe (1), and the fixing head (22) abuts against the inner top wall of the pipe (1). ), the fixed head (22) is fixed to the pipe (1) through the fixing assembly (3), and the lower part of the pipe body (21) is inclined to form an extrusion side (211) for water flow extrusion; the outer diameter of the sealing ring (23) is larger than the outer diameter of the pipe body (21), and the inner peripheral wall of the pipe (1) is provided with an annular groove (11) for the sealing ring (23) to fit, and the top of the sealing ring (23) has a fixing portion fixed to the pipe (1) through the fixing assembly (3), and a telescopic portion (4) is provided on the side of the extrusion side (211) close to the sealing ring (23).

2. The polyurethane sewage pipe backflow preventer according to claim 1, characterized in that: A guide surface (5) is provided at the connection between the telescopic portion (4) and the sealing ring (23).

3. The polyurethane sewage pipe backflow preventer according to claim 1, characterized in that: The telescopic portion (4) comprises a plurality of connected folding sheets (41), wherein two adjacent folding sheets (41) are arranged in a staggered manner, and the two adjacent folding sheets (41) can be bent along the connection.

4. The polyurethane sewage pipe backflow preventer according to claim 3, characterized in that: The connection between the adjacent folding sheets (41) is arranged in an arc-shaped chamfer.

5. The polyurethane sewage pipe backflow preventer according to claim 3, characterized in that: The two ends of the folding sheet (41) are fixed to form a folding ring, and the distance between the outer peripheral wall of the folding ring at the bottom and the inner wall of the bottom of the pipe (1) gradually increases in the direction away from the sealing ring (23).

6. The polyurethane sewage pipe backflow preventer according to claim 3, characterized in that: The length direction of the folding sheet (41) is parallel to the inclination direction of the extrusion side (211).

7. The polyurethane sewage pipe backflow preventer according to claim 6, characterized in that: The upper surface of the folded sheet (41) is arranged in an arc shape in a direction away from the inner wall of the bottom of the pipe (1).

8. The polyurethane sewage pipe backflow preventer according to claim 3, characterized in that: The widths of the plurality of folding pieces (41) gradually decrease from the middle of the telescopic portion (4) toward both sides.

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