CN210566337U

CN210566337U - Double check valve

Info

Publication number: CN210566337U
Application number: CN201921003041.0U
Authority: CN
Inventors: 唐庆红
Original assignee: Jiaxing Aidixi Heating And Ventilation Science & Technology Co ltd
Current assignee: Jiaxing Aidixi Heating And Ventilation Science & Technology Co ltd
Priority date: 2019-07-01
Filing date: 2019-07-01
Publication date: 2020-05-19
Anticipated expiration: 2029-07-01

Abstract

The utility model discloses a double check return valve capable of preventing sewage from flowing back under high pressure, which comprises a valve body, wherein the valve body is provided with a water inlet pipeline and a water outlet pipeline, the water inlet pipeline is connected with an upstream pipeline, the tail end of the upstream pipeline is connected with a central water chamber, the other side of the central water chamber is connected with a downstream pipeline, and the downstream pipeline is connected with the water outlet pipeline; the central water chamber comprises a first water chamber and a second water chamber communicated with the first water chamber, a conical spring ejector rod is plugged at an opening between the first water chamber and an upstream pipeline, the tail part of the conical spring ejector rod is connected with a conical spring, and the conical spring is fixed on an interlayer between the first water chamber and the second water chamber; and a spring ejector rod is plugged at an opening of the second water chamber communicated with the first water chamber, the tail part of the spring ejector rod is connected with a spring, and the spring is fixed on the right side boundary of the second water chamber. When the backflow prevention device is used, the backflow passage can be sealed by the conical spring ejector rod and the spring ejector rod, and the double non-return structure can better prevent sewage from flowing back under high pressure.

Description

Double check valve

Technical Field

The utility model belongs to the technical field of the check valve and specifically relates to a two check valves are related to.

Background

At present, a check valve is often arranged in a pipeline system for supplying water to a boiler with sewage discharge to prevent sewage from flowing back. However, the pressure difference between the drinking water side and the sewage side in the piping system with the water supply of the sewage boiler is often larger than the pressure difference that the ordinary check valve can bear, so when the pressure of the sewage part in the system is temporarily higher than the pressure in the drinking water system, the ordinary check valve cannot prevent the sewage from flowing back well, how to prevent the sewage from flowing back under the high pressure difference, and how to prevent the sewage from polluting the drinking water when the pressure difference is larger than the critical value becomes a problem that must be solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a double check return valve for preventing sewage from flowing back under high pressure is provided.

The technical scheme adopted by the utility model is that the double check valve comprises a valve body and an inner wall of the valve body, wherein the valve body is provided with a water inlet pipeline and a water outlet pipeline, the water inlet pipeline is connected with an upstream pipeline, the tail end of the upstream pipeline is connected with a central water chamber, the other side of the central water chamber is connected with a downstream pipeline, and the downstream pipeline is connected with the water outlet pipeline;

the central water chamber comprises a plastic sleeve seat, the plastic sleeve seat is in contact with the inner wall of the valve body, a first partition plate with a first communicating port is arranged at the communicating position of the plastic sleeve seat and an upstream pipeline, a first water chamber is arranged on the right side of the first partition plate, a second partition plate with a second communicating port is arranged on the right side of the first water chamber, a second water chamber is arranged on the right side of the second partition plate, the right side of the second water chamber is communicated with a downstream pipeline, a conical spring ejector rod is plugged at the first communicating port, the tail part of the conical spring ejector rod is connected with a conical spring, and the conical spring is fixed on the left side of the second partition plate;

and the second communicating port is plugged with a spring ejector rod, the tail part of the spring ejector rod is connected with a spring, and the spring is fixed on the right side boundary of the second water chamber.

The utility model has the advantages that: through the double non-return structure that conical spring ejector pin, conical spring, spring ejector pin and spring constitute for the pressure differential that the check valve can bear is higher, and non-return performance is better, and when the pressure of the side of intaking was higher than the play water side, conical spring and spring shrink, conical spring ejector pin and spring ejector pin retreat, and rivers can flow to play water side from the side of intaking smoothly. When the pressure of the water outlet side is higher than that of the water inlet side, the spring and the conical spring extend, the first communication port is blocked by the conical spring ejector rod, the second communication port is blocked by the spring ejector rod, and at the moment, the water flow on the water outlet side cannot flow back to the water inlet side.

Preferably, the first water chamber is provided with a sewage discharge pipeline, so that when the pressure difference borne by the double non-return structure reaches a critical value, sewage can flow away from the sewage discharge channel.

Preferably, the trapway is provided with a removable closure cap to allow controlled use of the trapway.

Preferably, the first partition plate is a large rubber gasket, so that the conical spring ejector rod is not easily abraded.

As the priority, the water inlet end of the upstream pipeline is close to the upper part of the valve body, the water outlet end of the upstream pipeline is close to the lower part of the valve body, the water inlet pipeline and the first communicating port are obliquely connected, the upstream pipeline with the inclination has better anti-reflux effect, and the water inlet effect is also better.

Preferably, a protective layer is arranged at the contact position of the spring ejector rod and the second communication port, so that the spring ejector rod is not easily abraded.

Preferably, the protective layer is a rubber gasket, so that the anti-abrasion effect is better.

Preferably, an upper non-return switch is arranged between the water inlet pipeline and the upstream pipeline, so that the water flow on the water inlet side can be freely controlled.

Preferably, a lower non-return switch is arranged between the water outlet pipeline and the downstream pipeline, so that the water flow at the water outlet side can be freely controlled.

Preferably, a sealing ring is arranged between the plastic sleeve seat and the inner wall of the valve body, so that the double non-return structure has better sealing performance.

Preferably, the sealing ring is an O-shaped ring, so that the sealing performance is better.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a general schematic view of the present invention;

as shown in the figure: 1. a valve body; 2. a water inlet; 3. a water outlet; 4. a blowdown line; 5. an upper non-return switch; 6. a lower non-return switch; 7. a closure cap; 8. a spring; 9. a spring ejector rod; 10. a protective layer; 11. a conical spring; 12. a first separator; 13. a conical spring ejector rod; 14. an O-shaped ring; 15. a plastic sleeve seat; 16. a downstream pipeline; 17. a water outlet pipeline; 18. an upstream line; 19. a water inlet pipe; 20. a central water chamber; 21. a first water chamber; 22. a second water chamber; 23. a second separator; 24. a second communication port; 25. the upper part of the valve body; 26 the lower part of the valve body; 27. the inner wall of the valve body; 28. the first communication port.

Detailed Description

The invention is further described below with reference to the accompanying drawings in combination with the embodiments so that those skilled in the art can implement the invention with reference to the description, and the scope of the invention is not limited to the embodiments.

As shown in fig. 1-2, the utility model discloses a double check valve, which comprises a valve body 1 and a valve body inner wall 27, wherein the valve body 1 is provided with a water inlet pipe 19 and a water outlet pipe 17, the water inlet pipe 19 is connected with an upstream pipeline 18, the end of the upstream pipeline 18 is connected with a central water chamber 20, the other side of the central water chamber 22 is connected with a downstream pipeline 16, and the downstream pipeline 16 is connected with the water outlet pipe 17;

central authorities hydroecium 20 includes plastic sleeve seat 15, plastic sleeve seat 15 and the contact of valve body inner wall 27, there is a first baffle 12 that opens and have first intercommunication mouth 28 in plastic sleeve seat 15 and the 18 intercommunication departments of upper reaches pipeline, first baffle 12 right side is first hydroecium 21, there is the second baffle 23 of opening second intercommunication mouth 24 in first hydroecium 21 right side, second baffle 23 right side is second hydroecium 22, second hydroecium 22 right side and the 16 intercommunication of low reaches pipeline, the stopper of 28 departments of first intercommunication mouth has conical spring ejector pin 13, conical spring ejector pin 13 end connection has conical spring 11, conical spring 11 fixes on second baffle 23 left side.

The second communicating port 24 is plugged with a spring ejector rod 9, the tail of the spring ejector rod 9 is connected with a spring 8, and the spring 8 is fixed on the right side boundary of the second water chamber 22.

Through the double non-return structure that conical spring ejector pin 13, conical spring 11, spring ejector pin 9 and spring 8 constitute for the pressure differential that the check valve can bear is higher, and non-return performance is better, and when the pressure of the side of intaking was higher than the play water side, conical spring 11 and spring 8 shrink, conical spring ejector pin 13 and spring ejector pin 9 retreat, and rivers can flow to the play water side from the side of intaking smoothly. When the pressure of the water outlet side is higher than that of the water inlet side, the spring 8 and the conical spring 11 extend, the first communication port 28 is blocked by the conical spring ejector rod 13, the second communication port 24 is blocked by the spring ejector rod 9, and at the moment, the water flow on the water outlet side cannot flow back to the water inlet side.

The first water chamber 21 is provided with a sewage discharge pipeline 4, so that when the pressure difference borne by the double non-return structure reaches a critical value, sewage can flow away from the sewage discharge channel 4.

The sewer 4 is provided with a detachable closing cover, so that the use of the sewer is controllable.

The first clapboard 12 is a large rubber gasket, so that the conical spring ejector rod is not easy to wear.

The water inlet end of the upstream pipeline 18 is close to the upper part 25 of the valve body, the water outlet end is close to the lower part 26 of the valve body, the water inlet pipeline 19 and the first communicating port 28 are connected in an inclined mode, the backflow preventing effect of the inclined upstream pipeline 18 is better, and the water inlet effect is also better.

The contact part of the spring ejector rod 9 and the second communication port 24 is provided with a protective layer 10, so that the spring ejector rod 9 is not easily abraded.

The protective layer 10 is a rubber gasket, so that the anti-abrasion effect is better.

An upper non-return switch 5 is arranged between the water inlet pipeline 19 and the upstream pipeline 18, so that the water flow on the water inlet side can be freely controlled.

A lower non-return switch 6 is arranged between the water outlet pipe 17 and the downstream pipeline 16, so that the water flow on the water outlet side can be freely controlled.

And a sealing ring 14 is arranged between the plastic sleeve seat 15 and the inner wall 27 of the valve body, so that the double non-return structure has better sealing property.

The sealing ring 14 is an O-shaped ring, so that the sealing performance is better.

When the water-saving type water-saving device is used, the upper stop reverse switch 5 and the lower check switch 6 are opened, the sealing cover 7 on the sewage discharge pipeline 4 is covered, water flow is introduced from the water inlet 1, when the water pressure of the water inlet 1 is greater than the water pressure of the water outlet 2, the conical spring ejector rod 13 leaves from the opening of the large rubber gasket 12 under the pushing of the water pressure, and the water flow enters the first water chamber 21. When the water pressure reaches a certain degree, the tail end of the conical spring ejector rod 13 is contacted with the top end of the spring ejector rod 9, the conical spring ejector rod 9 is pushed by the water pressure to move backwards, and water flow enters the second water chamber 22 from the first water chamber 21 and then leaves the water outlet 2 through the downstream pipeline 16.

When the water pressure of the water outlet 2 is greater than the water pressure of the water inlet 1, but the pressure difference between the water inlet 1 and the water outlet 2 is not greater than a critical value, the conical spring ejector rod 13 and the spring ejector rod 9 can completely block a water flow channel, so that sewage cannot flow back.

When the pressure difference between the water inlet 1 and the water outlet 2 is equal to the critical value, the double check structure can not well prevent the sewage from flowing back, at the moment, the sealing cover 7 on the sewage discharge pipeline 4 needs to be opened, the sewage flows out from the sewage discharge pipeline 4, in the process, the water pressure of the water outlet 2 is continuously reduced, and the pressure difference between the water outlet 2 and the water inlet 1 is also continuously reduced until the double check structure returns to the normal sealing state.

When the upper non-return switch 5 is rotated to close the upstream pipeline 18, and the water is cut off suddenly, the downstream pipeline 16 is normally opened at the moment, the sewage at the water outlet 2 flows back under the action of water pressure and flows back to the central water chamber 20 from the downstream pipeline 16, and at the moment, due to the existence of the sewage discharge pipeline 4, the sewage flows away from the sewage discharge pipeline 4 and cannot enter the upstream pipeline 18 due to siphon.

Claims

1. The utility model provides a double check valve, includes valve body (1) and valve body inner wall (27), its characterized in that: the valve body (1) is provided with a water inlet pipeline (19) and a water outlet pipeline (17), the water inlet pipeline (19) is connected with an upstream pipeline (18), the tail end of the upstream pipeline (18) is connected with a central water chamber (20), the other side of the central water chamber (20) is connected with a downstream pipeline (16), and the downstream pipeline (16) is connected with the water outlet pipeline (17);

the central water chamber (20) comprises a plastic sleeve seat (15), the plastic sleeve seat (15) is in contact with the inner wall (27) of the valve body, a first partition plate (12) with a first communication port (28) is arranged at the communication position of the plastic sleeve seat (15) and an upstream pipeline (18), a first water chamber (21) is arranged on the right side of the first partition plate (12), a second partition plate (23) with a second communication port (24) is arranged on the right side of the first water chamber (21), a second water chamber (22) is arranged on the right side of the second partition plate (23), the right side of the second water chamber (22) is communicated with a downstream pipeline (16), a conical spring ejector rod (13) is plugged at the first communication port (28), the tail part of the conical spring ejector rod (13) is connected with a conical spring (11), and the conical spring (11) is fixed on the left side of the second partition plate (23);

the second communicating opening (24) is plugged with a spring ejector rod (9), the tail part of the spring ejector rod (9) is connected with a spring (8), and the spring (8) is fixed on the right side boundary of the second water chamber (22).

2. A double non-return valve according to claim 1, characterized in that: and a sewage discharge pipeline (4) is arranged on the first water chamber (21).

3. A double non-return valve according to claim 2, characterized in that: the sewage draining pipeline (4) is provided with a detachable closing cover (7).

4. A double non-return valve according to claim 1, characterized in that: the first partition plate (12) is a large rubber gasket.

5. A double non-return valve according to claim 1, characterized in that: the water inlet end of the upstream pipeline (18) is close to the upper part (25) of the valve body, the water outlet end of the upstream pipeline is close to the lower part (26) of the valve body, and the upstream pipeline is obliquely connected with the water inlet pipeline (19) and the first communication port (28).

6. A double non-return valve according to claim 1, characterized in that: and a protective layer (10) is arranged at the contact position of the spring ejector rod (9) and the second communication port (24).

7. A double non-return valve according to claim 6, characterized in that: the protective layer (10) is a rubber gasket.

8. A double non-return valve according to claim 1, characterized in that: an upper non-return switch (5) is arranged between the water inlet pipeline (19) and the upstream pipeline (18).

9. A double non-return valve according to claim 1, characterized in that: a lower non-return switch (6) is arranged between the water outlet pipeline (17) and the downstream pipeline (16).

10. A double non-return valve according to claim 1, characterized in that: and a sealing ring (14) is arranged between the plastic sleeve seat (15) and the inner wall (27) of the valve body.