A type of backflow valve
By designing an intermittent contact connection between the floating body and the end cap of the backflow valve and a conical sealing cup structure, the problem of reduced sealing performance caused by scaling of the float ball in existing drain check valves has been solved, achieving effective backflow prevention and sealing of drain pipes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINGZHOU UNIV
- Filing Date
- 2025-10-20
- Publication Date
- 2026-07-17
Smart Images
Figure CN224514340U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a backflow valve, belonging to the technical field of sewage pipe auxiliary equipment. Background Technology
[0002] In building components, check valves are often installed on drainage pipes to prevent sewage from flowing back into the rooms when the drain pipe is blocked. Existing check valves, such as the domestic drain backflow preventer disclosed in utility model patent CN202882072U, while meeting certain usage requirements, suffer from several drawbacks. During operation, sewage directly impacts a float before falling; impurities in the sewage easily adhere to the float's surface; and over time, scale easily builds up on the float, leading to insufficient buoyancy or float jamming and failure to seal. Therefore, it is necessary to develop a new backflow valve to address these problems associated with existing domestic drain backflow preventers. Summary of the Invention
[0003] The purpose of this utility model is to provide a backflow valve with a compact structure and ingenious design to solve the problem of non-sealing caused by easy scaling on the surface of the float ball in existing domestic sewage check valves.
[0004] The technical solution of this utility model is: A backflow valve includes a floating body, a shielding cylinder, an end cap, and a connecting base; characterized in that: the floating body is movably mounted in the connecting base via a retainer; the shielding cylinder and the end cap are sequentially installed at the upper end of the connecting base; the floating body and the end cap are intermittently in contact; the shielding cylinder is equipped with a mesh; and two sets of sealing valve plates are symmetrically mounted in the middle of the mesh via a rotating pin.
[0005] The two sets of sealing valve plates always tend to fit into the mesh body under the action of gravity; when the two sets of sealing valve plates fit into the mesh body, they form a circular structure.
[0006] The end cap has a flow hole inside; the floating body is intermittently connected to the flow hole.
[0007] The connecting base has a four-way structure; both ends of the connecting base are sealed; a retainer is provided inside the upper end of the connecting base; the retainer includes an outer assembly ring, a guide inner ring, and a connecting rib; the outer assembly ring is installed inside the upper end of the connecting base; the guide inner ring is installed inside the outer assembly ring via the connecting rib; a floating body is movably installed inside the guide inner ring.
[0008] The floating body includes a floating body and a sealing cup; the floating body has a hollow internal structure; a guide rod is provided on the floating body; the guide rod is slidably connected to the inner guide ring; and a sealing cup is installed at the top of the guide rod.
[0009] The sealing cup has a conical structure.
[0010] The advantages of this utility model are: This backflow valve has a compact structure and ingenious design. During normal operation, under the action of the shielding cylinder, sewage can flow through the surrounding sealing cup of the floating body, thus avoiding the problem of dirt adhering to the sealing cup when sewage comes into contact with it, which would prevent it from sealing properly. It is particularly suitable for use in sewer pipes. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the isometric structure of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 for Figure 3 Schematic diagram of the structure in the AA direction; Figure 5 This is a schematic diagram of the exploded structure of this utility model; Figure 6 This is a schematic diagram of the structure of the floating body of this utility model; Figure 7 This is a cross-sectional structural diagram of the floating body of this utility model; Figure 8 This is a cross-sectional structural diagram of the shielding cylinder of this utility model; Figure 9 This is a schematic diagram of the end cap structure of this utility model; Figure 10 for Figure 9 A schematic diagram of the cross-sectional structure; Figure 11 This is a schematic diagram of the structure of the connecting base of this utility model; Figure 12 This is a schematic diagram of the structure of this utility model when it is in a sealed state.
[0012] In the diagram: 1. Connecting base; 2. Cage; 3. Floating body; 4. Shielding cylinder; 5. End cap; 6. Grid body; 7. Rotating pin; 8. Sealing valve plate; 9. Flow hole; 10. Assembly outer ring; 11. Guide inner ring; 12. Connecting rib; 13. Floating body; 14. Sealing cup; 15. Guide rod. Detailed Implementation
[0013] The backflow valve includes a floating body 3, a baffle cylinder 4, an end cap 5, and a connecting base 1 (see the instruction manual appendix). Figure 1 and 2 ).
[0014] Connector 1 has a four-way structure; both ends of connector 1 are sealed (see instruction manual appendix). Figure 1 , 2 (and 11); the backflow valve is installed on the drain pipe via the connecting base 1.
[0015] A retainer 2 is provided inside the upper end of the connecting base 1; the retainer 2 includes an outer mounting ring 10, a guide inner ring 11, and a connecting rib 12; the outer mounting ring 10 is installed inside the upper end of the connecting base 1; the guide inner ring 11 is installed inside the outer mounting ring 10 via the connecting rib 12; a floating body 3 is movably installed inside the guide inner ring 11 (see the attached instruction manual). Figure 2 and 4 The purpose of this connection between the base 1 and the cage 2 is to ensure that during operation, the floating body 3 can only move up and down under the guidance of the cage 2, and cannot produce other movements, thereby avoiding the problem of the floating body 3 deviating from its running trajectory when subjected to force.
[0016] The floating body 3 includes a floating body 13 and a sealing cup 14; the floating body 13 has a hollow internal structure; a guide rod 15 is provided on the floating body 13; the guide rod 15 is slidably connected to the inner guide ring 11; and a conical sealing cup 14 is installed at the top of the guide rod 15. Because the floating body 13 has a hollow internal structure, when the connecting base 1 is filled with water, it will move upward under the action of buoyancy.
[0017] The purpose of designing the sealing cup 14 as a conical structure is to enable the sealing cup 14 to seal with the flow hole 9 on the end cap 5 through the conical surface during operation, so that it can fit more tightly with the flow hole 9 and the sealing performance is stronger.
[0018] A shielding cylinder 4 and an end cap 5 are sequentially installed on the upper end of the connecting base 1; the floating body 3 is intermittently connected to the end cap 5; a mesh body 6 is installed inside the shielding cylinder 4; two sets of sealing valve plates 8 are symmetrically installed in the middle of the mesh body 6 via rotating pins 7 (see the attached instruction manual). Figure 8 ).
[0019] Under the influence of gravity, the two sets of sealing valve plates 8 always tend to adhere to the mesh body 6; when the two sets of sealing valve plates 8 adhere to the mesh body 6, they form a circular structure (see the instruction manual appendix). Figure 8 ).
[0020] The end cap 5 has a flow hole 9 inside; the floating body 3 is intermittently connected to the flow hole 9 (see the instruction manual). Figure 10 ).
[0021] When the backflow valve is working, under normal circumstances, water flows downward through the flow hole 9 of the end cap 5 (see the instruction manual appendix). Figure 4When the water flows into contact with the sealing valve plate 8, it will continue to flow downwards through the surrounding mesh 6 under the action of the sealing valve plate 8, until it enters the connecting base 1 and is finally discharged through the drain pipe. During this process, since the sealing cup 14 of the floating body 3 is located directly below the sealing valve plate 8, the water flow will not come into contact with the sealing cup 14. This avoids the problem of dirt adhering to the sealing cup 14 when sewage comes into contact with it, which would prevent it from sealing properly.
[0022] When the drain pipe is blocked and sewage fills the connecting base 1, the floating body 3 will move upward under the action of buoyancy. During the upward movement of the floating body 3, it will first push open the sealing valve plate 8 (see the instruction manual appendix). Figure 12 Then it moves upward and finally seals the sealing cup 14 with the flow hole 9 of the end cap 5, thus avoiding the problem of sewage flowing back upward after passing through the end cap 5.
[0023] Once the sewer pipe is cleared and the sewage exits the connecting base 1, the floating body 3 and the sealing valve plate 8 will quickly reset under the action of gravity; the backflow valve can then enter the next working cycle.
[0024] To ensure that the sealing valve plate 8 can be quickly reset, a torsion spring can be installed on the rotating pin 7 so that it can be quickly reset under the action of the torsion spring force during operation.
[0025] This backflow valve has a compact structure and ingenious design. During normal operation, under the action of the shielding cylinder 4, sewage can flow around the sealing cup 14 of the floating body 3, thereby avoiding the problem of dirt adhering to the sealing cup 14 when sewage comes into contact with it, which would prevent it from sealing properly. It is particularly suitable for use in sewer pipes.
Claims
1. A backwater valve comprising a floating body (3), a blocking cylinder (4), an end cover (5) and a connecting base (1); characterized in that: The connecting base (1) is equipped with a floating body (3) through a retainer (2); a shielding cylinder (4) and an end cap (5) are installed sequentially at the upper end of the connecting base (1); the floating body (3) and the end cap (5) are intermittently connected in contact; a mesh body (6) is installed inside the shielding cylinder (4); two sets of sealing valve plates (8) are symmetrically installed in the middle of the mesh body (6) through a rotating pin (7).
2. A backwater valve according to claim 1, wherein: The two sets of sealing valve plates (8) always tend to fit with the grid body (6) under the action of gravity; when the two sets of sealing valve plates (8) fit with the grid body (6), they form a circular structure.
3. A backflow valve according to claim 1, characterized in that: The end cap (5) is provided with a flow hole (9) inside; the floating body (3) is intermittently connected to the flow hole (9).
4. A backwater valve according to claim 1, wherein: The connecting base (1) has a four-way structure; the two ends of the connecting base (1) are sealed; a retainer (2) is provided inside the upper end of the connecting base (1); the retainer (2) includes an outer ring (10), a guide inner ring (11) and a connecting rib (12); the outer ring (10) is installed inside the upper end of the connecting base (1); the guide inner ring (11) is installed inside the outer ring (10) through the connecting rib (12); a floating body (3) is movably installed inside the guide inner ring (11).
5. A backwater valve according to claim 4, wherein: The floating body (3) includes a floating body (13) and a sealing cup (14); the floating body (13) has a hollow structure inside; a guide rod (15) is provided on the floating body (13); the guide rod (15) is slidably connected to the inner guide ring (11); and a sealing cup (14) is installed at the top of the guide rod (15).
6. A backwater valve according to claim 5, wherein: The sealing cup (14) has a conical structure.