Anti-freezing check valve for liquid conveying pipeline

Abstract

The anti-freezing check valve comprises a first valve body, a second valve body, a valve rod, a valve clack and a backflow hole, the second valve body is arranged on one side of the first valve body, a second through hole is formed in the first valve body, a first through hole is formed in the second valve body, and a second through hole is formed in the second valve body. The valve rod is arranged at the center positions in the first valve body and the second valve body in a penetrating mode, a spring is installed on the outer wall of one side of the valve rod, the valve clack is fixed to the outer wall of the valve rod, an annular sealing piece adheres to the surface of the valve clack, and the backflow hole is formed in the bottom of the second valve body. A through groove is formed in the position, below the backflow hole, of the bottom of the second valve body, and a blocking piece is arranged in the through groove. Residual water in the pipeline can be automatically emptied, the anti-freezing effect is achieved, the opening and blocking state of the backflow hole can be manually controlled according to the actual situation, and flexibility and convenience are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of check valves, in particular to an antifreeze check valve for a liquid delivery pipeline. Background Art

[0002] A check valve is also called a reverse flow valve, a non-return valve, a back pressure valve and a one-way valve. This type of valve automatically opens and closes by the force generated by the flow of the medium in the pipeline. It is an automatic valve.

[0003] In the water supply pipeline, in order to prevent the violent backflow of the pipeline liquid, a check valve is usually installed at the pump outlet, but the check valve will cause the liquid in the main pipeline to be stored in the pipeline for a long time. In the northern winter, the liquid stored in the pipeline for a long time will cause the pipeline to freeze and crack. Traditionally, to prevent the pipeline from freezing and cracking, a discharge ball valve can be installed at the lower part of the pipeline. However, for enterprises that have intermittent production in winter, frequent opening and closing of a large number of discharge ball valves requires a lot of manpower and is prone to operating errors, which brings many inconveniences to production and life. Therefore, we propose an antifreeze check valve for liquid delivery pipelines. Summary of the invention

[0004] The object of the present invention is to provide an antifreeze check valve for a liquid delivery pipeline to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an antifreeze check valve for a liquid delivery pipeline, comprising a first valve body, a second valve body, a valve stem, a valve disc and a reflux hole, the second valve body being arranged on one side of the first valve body, the interior of the first valve body being provided with a second through hole, the interior of the second valve body being provided with a first through hole, the valve stem being arranged at a central position inside the first valve body and the second valve body, and a spring being installed on an outer wall on one side of the valve stem, the valve disc being fixed on the outer wall of the valve stem, and an annular sealing sheet being adhered to the surface of the valve disc, the annular sealing sheet being tightly engaged with the first through hole, the reflux hole being arranged at the bottom of the second valve body, a through groove being arranged at the bottom of the second valve body below the reflux hole, and a baffle being arranged inside the through groove, a threaded seat being fixed at the bottom end of the second valve body at the through groove position, and a threaded rod being threadedly connected to the internal thread of the threaded seat, and the top end of the threaded rod being movably connected to the baffle.

[0006] Preferably, an external thread groove is provided on the outer wall of one end of the first valve body, and an internal thread groove is provided on the outer wall of one end of the second valve body, and the internal thread groove is tightly engaged with the external thread groove for disassembly and assembly of the first valve body and the second valve body.

[0007] Preferably, an O-ring is adhered to the connection between the first valve body and the second valve body, thereby improving the sealing performance of the connection between the first valve body and the second valve body.

[0008] Preferably, a filter tank is provided at one end of the second valve body away from the first valve body, and a filter screen is provided inside the filter tank, and the filter screen is connected to the second valve body by screws to prevent impurities from clogging the inside of the check valve.

[0009] Preferably, an arc-shaped piece is fixed to one end of the valve stem to better bear the impact of water flow and push the valve stem to move.

[0010] Preferably, a sealing ring is adhered to the edge of the valve flap surface, thereby further improving the sealing performance of the valve flap.

[0011] Preferably, a sealing groove is provided on the inner wall of the second valve body at the position of the sealing ring, and the sealing groove and the sealing ring cooperate with each other.

[0012] Preferably, a sealing gasket is adhered to the inner wall of the through groove, and the sealing gasket fits tightly with the baffle, thereby improving the sealing performance between the baffle and the through groove.

[0013] Preferably, a positioning groove is provided at the top of the reflux hole at the position of the through groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By rotating the threaded rod to drive the baffle to move down into the through groove, the setting of the sealing gasket improves the sealing between the baffle and the through groove. After the baffle moves down to the inside of the through groove, the reflux hole is in an open state, so that the liquid can slowly flow back through the reflux hole, automatically draining the remaining water in the pipeline to play an anti-freezing role. In addition, the small amount of water and the slow flow rate will not cause the water pump impeller to reverse, ensuring the safety and reliability of the water pump equipment. In addition, the opening and blocking states of the reflux hole can be manually controlled according to actual conditions, which is flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional enlarged structural schematic diagram of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the structure of middle B; Figure 3 It is a schematic diagram of the enlarged structure of the valve flap of the present invention from the side view; Figure 4 For the present invention Figure 1 The enlarged structural diagram at A in the middle; Figure 5 It is a schematic diagram of the enlarged structure of the filter screen of the present invention; Figure 6 It is a schematic diagram of a partially enlarged structure of the present invention.

[0016] In the figure: 1. first valve body; 2. second valve body; 3. first through hole; 4. valve stem; 5. arc-shaped sheet; 6. valve disc; 7. spring; 8. second through hole; 9. annular sealing sheet; 10. sealing groove; 11. sealing ring; 12. reflux hole; 13. positioning groove; 14. through groove; 15. sealing gasket; 16. baffle; 17. threaded seat; 18. threaded rod; 19. filter groove; 20. filter screen; 21. screw; 22. external thread groove; 23. internal thread groove; 24. O-ring. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0018] Example: As shown in the attached Figures 1 to 3 The antifreeze check valve for a liquid delivery pipeline shown in the figure comprises a first valve body 1, a second valve body 2, a valve stem 4, a valve flap 6 and a reflux hole 12, the second valve body 2 is arranged on one side of the first valve body 1, the first valve body 1 is provided with a second through hole 8, the second valve body 2 is provided with a first through hole 3, the valve stem 4 is penetrated at the center position of the first valve body 1 and the second valve body 2, and a spring 7 is installed on the outer wall of one side of the valve stem 4, the valve flap 6 is fixed on the outer wall of the valve stem 4, and an annular sealing sheet 9 is adhered to the surface of the valve flap 6, and the annular sealing sheet 9 is tightly engaged with the first through hole 3; Specifically, the liquid impacts the arc-shaped sheet 5 so that the valve stem 4 overcomes the elasticity of the spring 7 and drives the valve disc 6 to move to the right, and the valve disc 6 drives the annular sealing sheet 9 to move out of the first through hole 3, so that the liquid flows into the first valve body 1 through the first through hole 3 and then is discharged through the second through hole 8. When the liquid stops flowing, under the elastic action of the spring 7, the valve stem 4 drives the valve disc 6 to move to the left, and the annular sealing sheet 9 blocks the first through hole 3 to prevent the liquid from flowing back. The reflux hole 12 is arranged at the bottom of the second valve body 2, a through groove 14 is arranged at the bottom of the second valve body 2 below the reflux hole 12, and a baffle 16 is arranged inside the through groove 14, a threaded seat 17 is fixed to the bottom end of the second valve body 2 at the position of the through groove 14, and a threaded rod 18 is connected to the inner thread of the threaded seat 17, and the top end of the threaded rod 18 is movably connected to the baffle 16; Specifically, the threaded rod 18 is rotated to drive the baffle 16 to move down into the through groove 14. The setting of the sealing gasket 15 improves the sealing between the baffle 16 and the through groove 14. After the baffle 16 moves down into the through groove 14, the reflux hole 12 is in an open state, so that the liquid can slowly flow back through the reflux hole 12, automatically draining the remaining water in the pipeline, playing an anti-freezing role. In addition, the water volume is small and the flow rate is slow, which will not cause the water pump impeller to reverse, ensuring the safety and reliability of the water pump equipment. An external thread groove 22 is provided on the outer wall of one end of the first valve body 1, and an internal thread groove 23 is provided on the outer wall of one end of the second valve body 2, and the internal thread groove 23 is tightly meshed with the external thread groove 22; Specifically, when the check valve needs to be repaired and maintained, the first valve body 1 and the second valve body 2 are rotated so that the external thread groove 22 is separated from the internal thread groove 23, and the first valve body 1 and the second valve body 2 can be separated, thereby improving the convenience of repair and maintenance; An O-ring 24 is adhered to the connection between the first valve body 1 and the second valve body 2; A filter tank 19 is disposed at one end of the second valve body 2 away from the first valve body 1, and a filter screen 20 is disposed inside the filter tank 19, and the filter screen 20 is connected to the second valve body 2 via screws 21; Specifically, the filter 20 filters the liquid to remove impurities inside the liquid, thereby preventing the impurities from clogging the inside of the check valve. An arc-shaped piece 5 is fixed to one end of the valve stem 4; A sealing ring 11 is adhered to the edge of the valve disc 6; A sealing groove 10 is provided on the inner wall of the second valve body 2 at the position of the sealing ring 11, and the sealing groove 10 and the sealing ring 11 cooperate with each other; A sealing gasket 15 is adhered to the inner wall of the through groove 14, and the sealing gasket 15 is tightly fitted with the baffle 16; A positioning groove 13 is provided at the top of the reflux hole 12 at the position of the through groove 14 .

[0019] When the embodiment of the present application is in use: first, the check valve is composed of a first valve body 1 and a second valve body 2, the first valve body 1 and the second valve body 2 are threadedly connected by an external thread groove 22 and an internal thread groove 23, and the connection is sealed by an O-ring 24, and then, it flows into the interior of the second valve body 2 through the filter screen 20, and the filter screen 20 filters the liquid to filter out the impurities inside it to prevent the impurities from clogging the inside of the check valve, and then, the liquid impacts the arc-shaped sheet 5 so that the valve stem 4 overcomes the elasticity of the spring 7 and drives the valve flap 6 to translate to the right, and the valve flap 6 drives the annular sealing sheet 9 to move out of the first through hole 3, so that the liquid flows into the first valve body 1 through the first through hole 3 and then is discharged through the second through hole 8. When the liquid stops flowing, under the elastic action of the spring 7, the valve stem 4 drives the valve flap 6 to move to the left, and the annular sealing sheet 9 blocks the first through hole 3 to prevent Liquid refluxes, further, the sealing ring 11 blocks the sealing groove 10 to improve the sealing performance of the valve disc 6. In winter, when there is water in the pipeline, the threaded rod 18 is rotated to drive the baffle 16 to move down into the through groove 14. The setting of the sealing gasket 15 improves the sealing performance between the baffle 16 and the through groove 14. After the baffle 16 moves down to the inside of the through groove 14, the reflux hole 12 is in an open state, so that the liquid can slowly flow back through the reflux hole 12, automatically draining the remaining water in the pipeline to play an anti-freezing role. Moreover, the small amount of water and the slow flow rate will not cause the water pump impeller to reverse, thereby ensuring the safety and reliability of the water pump equipment. Moreover, when the check valve needs to be inspected and maintained, the first valve body 1 and the second valve body 2 are rotated to separate the external thread groove 22 from the internal thread groove 23, so that the first valve body 1 and the second valve body 2 can be disassembled, thereby improving the convenience of inspection and maintenance.

[0020] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

Claims

1. An antifreeze check valve for a liquid delivery pipeline, characterized in that: The invention comprises a first valve body (1), a second valve body (2), a valve stem (4), a valve flap (6) and a return hole (12), wherein the second valve body (2) is arranged on one side of the first valve body (1), the first valve body (1) is provided with a second through hole (8), the second valve body (2) is provided with a first through hole (3), the valve stem (4) is arranged at a central position inside the first valve body (1) and the second valve body (2), and a spring (7) is installed on the outer wall of one side of the valve stem (4), the valve flap (6) is fixed on the outer wall of the valve stem (4), and the valve flap (6) is provided on the outer wall of the valve stem (4). ) is adhered to the surface of the second valve body (2), the annular sealing sheet (9) is tightly engaged with the first through hole (3), the reflux hole (12) is arranged at the bottom of the second valve body (2), a through groove (14) is arranged at the bottom of the second valve body (2) below the reflux hole (12), and a baffle (16) is arranged inside the through groove (14), a threaded seat (17) is fixed to the bottom end of the second valve body (2) at the position of the through groove (14), and a threaded rod (18) is connected to the internal thread of the threaded seat (17), and the top end of the threaded rod (18) is movably connected to the baffle (16).

2. The antifreeze check valve for liquid delivery pipeline according to claim 1, characterized in that: An external thread groove (22) is provided on the outer wall of one end of the first valve body (1), and an internal thread groove (23) is provided on the outer wall of one end of the second valve body (2), and the internal thread groove (23) is tightly meshed with the external thread groove (22).

3. The antifreeze check valve for liquid delivery pipeline according to claim 1, characterized in that: An O-ring (24) is adhered to the connection between the first valve body (1) and the second valve body (2).

4. The antifreeze check valve for liquid delivery pipeline according to claim 1, characterized in that: A filter tank (19) is provided at one end of the second valve body (2) away from the first valve body (1), and a filter screen (20) is provided inside the filter tank (19), and the filter screen (20) is connected to the second valve body (2) via a screw (21).

5. The antifreeze check valve for liquid delivery pipeline according to claim 1, characterized in that: An arc-shaped piece (5) is fixed to one end of the valve stem (4).

6. The antifreeze check valve for liquid delivery pipeline according to claim 1, characterized in that: A sealing ring (11) is adhered to the edge of the surface of the valve flap (6).

7. The antifreeze check valve for a liquid delivery pipeline according to claim 1, characterized in that: A sealing groove (10) is provided on the inner wall of the second valve body (2) at the position of the sealing ring (11), and the sealing groove (10) and the sealing ring (11) cooperate with each other.

8. The antifreeze check valve for a liquid delivery pipeline according to claim 1, characterized in that: A sealing gasket (15) is adhered to the inner wall of the through groove (14), and the sealing gasket (15) is tightly fitted to the blocking piece (16).

9. The antifreeze check valve for a liquid delivery pipeline according to claim 1, characterized in that: A positioning groove (13) is provided at the top of the reflux hole (12) at the position of the through groove (14).

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