CN219432528U

CN219432528U - Low-resistance backflow preventer with air partition function

Info

Publication number: CN219432528U
Application number: CN202223590046.2U
Authority: CN
Inventors: 李连亮; 施金坡
Original assignee: Pulian Power Fluid Control Shanghai Co ltd
Current assignee: Pulian Power Fluid Control Shanghai Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-07-28
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses a low-resistance backflow preventer with an air partition function, and belongs to the technical field of backflow preventers. Comprising the following steps: the device comprises a main valve body, an auxiliary valve body, a water drain valve, a partition part, a diaphragm assembly, a valve rod and a water drain pressure auxiliary communicating pipe assembly. According to the utility model, the upper cavity of the P3 is communicated with the pressure cavity of the P3 by additionally leading the auxiliary communicating pipe assembly of the water discharge pressure, the upper cavity of the P3 drives the valve rod to press upwards by utilizing the pressure difference between the P1 cavity and the P3 cavity and the Bernoulli effect, the valve rod drives the water discharge valve clack and the auxiliary sealing of the spring force to disconnect the water discharge joint, accumulated water in the P2 is discharged, and the problem that the stability of the water discharge function of the existing backflow preventer is reduced is solved, or when the instantaneous flow speed is too fast, the phenomenon of transient water leakage occurs in the sealing of the water discharge device is solved; or the spring is deformed under long-term stress, the elasticity is reduced, and the water can not be drained, so that the service life of the product and the stability of the function are prolonged and improved.

Description

Low-resistance backflow preventer with air partition function

Technical Field

The utility model relates to a low-resistance backflow preventer with an air separation function, and belongs to the technical field of backflow preventers.

Background

The backflow preventer (backflow preventer) is a device which is composed of non-return components and can prevent the water flow in the water supply pipeline from flowing backwards. The backflow preventer is a water control combined device which is developed under the condition that the backflow pollution prevention device is not effective under the condition that the backflow pollution prevention device is seriously polluted by running water supply equipment, especially domestic drinking water pipelines, and the water control combined device strictly limits water in the pipelines to flow in one direction only, and has the function of preventing media in the pipelines from flowing backwards under any working condition so as to achieve the purpose of avoiding backflow pollution. At present, the backflow preventer is mainly divided into a low-resistance backflow preventer and a decompression type backflow preventer, wherein the head loss of the low-resistance backflow preventer is less than 3 meters according to the national standard, and the head loss of the decompression type backflow preventer is less than 7 meters.

The drain device (water drain valve) of the current low-resistance backflow preventer uses spring force to push the drain device back to achieve the purpose of draining, and along with the growth of the service life of the backflow preventer, some accessories can be aged as follows: the water draining device is in a closed state for a long time, the spring at the bottom of the water draining device can be reduced in elasticity due to the fact that the spring is kept in a compressed state for a long time, the ideal state can not be restored any more, the spring is disabled, mechanical death is caused, and the whole water draining switch is blocked and fails to drain water. Or when the instantaneous flow speed is too high, the disturbance of the water flow to the water drain device causes the phenomenon of short dripping of the sealing of the water drain device. The above problems become more apparent with the increase of the service life. Most products on the market today have difficulty avoiding the above problems. In addition, the existing backflow preventer drain connector is formed by combining a plurality of metal parts, and is long in processing time, difficult to control in matching precision and high in manufacturing cost.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the low-resistance backflow preventer with the air partition function solves the problem that the stability of a water draining function of the backflow preventer in the prior art is reduced due to the increase of the service life of a product, or the phenomenon that the water draining device is sealed by disturbance of water flow to the water draining device to generate transient drip when the instantaneous flow speed is too high; or the spring is deformed due to long-term stress, the elasticity is reduced, and the spring is more seriously likely to lose function and can not drain water.

The technical problems to be solved by the utility model are realized by adopting the following technical scheme:

a low resistance backflow preventer with air blocking function, comprising:

the main valve body is internally provided with a front check valve, and a P1 pressure cavity is formed between the front check valve and the main valve body;

the auxiliary valve body is connected with the main valve body, a rear check valve is arranged in the auxiliary valve body, and a P3 pressure cavity is formed between the rear check valve and the auxiliary valve body;

the water draining valve is arranged in the P2 pressure cavity, and the P2 pressure cavity is formed between the main valve body and the auxiliary valve body;

the partition part is arranged in the P2 pressure cavity and separates the P2 pressure cavity to form a drainage pressure auxiliary cavity;

the diaphragm assembly is arranged in the water discharge pressure auxiliary cavity and separates the water discharge pressure auxiliary cavity into a P1 upper cavity and a P3 upper cavity, and the P1 upper cavity is communicated with the P1 pressure cavity;

one end of the valve rod is connected with the water drain valve, and the other end of the valve rod penetrates through the partition part in a sealing way and is connected with the diaphragm assembly;

and one end of the water discharge pressure auxiliary communicating pipe assembly is communicated with the P3 pressure cavity, and the other end of the water discharge pressure auxiliary communicating pipe assembly is communicated with the P3 upper cavity.

As a preferred example, the partition is provided as an integral partition connected to the main valve body.

As a preferred example, the partition is provided as a removable diaphragm connected to the main valve body.

As a preferred example, the drain pressure auxiliary communication pipe assembly is integrally connected or detachably connected with the low-resistance backflow preventer.

As a preferred example, the auxiliary drainage pressure communication assembly includes an auxiliary drainage pressure communication pipe, and connection holes are respectively formed in one side of the upper cavity of P3 and the upper cavity of P3, and are respectively connected with pipe joints, and the two pipe joints are connected with the head and tail ends of the auxiliary drainage pressure communication pipe.

As a preferable example, the connection hole is provided as a threaded hole, the pipe joint is provided as a threaded adapter sleeve joint, and both ends of the drainage pressure auxiliary communicating pipe are respectively connected with the threaded adapter sleeve joint.

As a preferred example, a valve cover is arranged at the top of the main valve body; the diaphragm assembly comprises a diaphragm and a diaphragm pressing plate, the edge of the diaphragm is clamped and fixed between the valve cover and the main valve body, the diaphragm pressing plate respectively clamps the centers of the upper surface and the lower surface of the diaphragm, and the top of the valve rod is sequentially connected with the diaphragm and the diaphragm pressing plate.

As a preferred example, an O-ring is provided between the valve stem and the partition.

As a preferred example, the water release valve includes water release joint, water release spring, sealing washer and water release valve clack, the water release joint sets up in P2 pressure chamber bottom, is provided with the water release spring in the water release joint, and water release joint top is equipped with the water release mouth, the sealing washer cup joint in water release valve clack bottom, water release joint bottom pass through the sealing washer butt in water release mouth of water release joint, the top and the valve rod bottom of water release valve clack are connected.

As a preferred example, the drain connector is an integral structure connected to the main valve body.

The beneficial effects of the utility model are as follows:

(1) According to the low-resistance backflow preventer with the air isolation function, the P3 upper cavity is arranged, the other path of drainage pressure auxiliary communicating pipe assembly is led to communicate the P3 upper cavity with the P3 pressure cavity, the pressure difference between the P1 cavity and the P3 cavity and the Bernoulli effect are utilized to enable the P3 upper cavity to drive the valve rod to apply pressure upwards, the valve rod drives the drainage valve clack and the drainage joint to break sealing under the assistance of the elastic force of the spring, accumulated water in the P2 is drained, the problem that the stability of the drainage function of the existing backflow preventer is reduced is solved, or when the instantaneous flow speed is too fast, the phenomenon of transient drip appears in the sealing of the drainage device is solved; or the spring is deformed under long-term stress, the elasticity is reduced, and the water can not be drained, so that the service life of the product and the stability of the function are prolonged and improved.

(2) According to the utility model, the water draining joint of the backflow preventer is integrally arranged from the original split structure, so that the processing and assembling time is shortened, and the manufacturing cost is reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of a backflow preventer according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of the working principle of the backflow preventer according to the embodiment of the present utility model.

In the figure:

1. a drain joint; 2. a water discharge spring; 3. o-shaped sealing rings I; 4. a water discharge valve flap; 5. o-shaped sealing rings II; 6. adjusting the gasket; 7. a main valve body; 8. a first sealing ring; 9. a front check valve disc; 10. a spring seat; 11. a spring; 12. a second sealing ring; 13. a valve stem; 14. a valve seat; 15. a rear check valve disc; 16. an O-shaped sealing ring III; 17. an auxiliary valve body; 18. an O-shaped sealing ring IV; 19. a stud bolt; 20. a hexagonal nut; 21. a diaphragm lower pressure plate; 22. a membrane; 23. a diaphragm upper press plate; 24. a hexagonal thin nut; 25. an O-shaped sealing ring V; 26. a valve cover; 27. an inner hexagon bolt; 28. a pipe joint; 29. a communicating pipe; 30. a channel; 31. a P1 pressure chamber; 32. p1 upper cavity; 33. a P2 pressure chamber; 34. a P3 pressure chamber; 35. p3 upper cavity.

Detailed Description

The utility model will be further described with reference to the following detailed drawings and examples, in order to make the technical means, the creation features, the achievement of the objects and the effects of the utility model easily understood.

Examples:

as shown in fig. 1, an embodiment of the present utility model provides a low resistance backflow preventer with an air blocking function, comprising a main valve body 7, a sub valve body 17, a front check valve, a rear check valve, a drain valve, a blocking portion, a diaphragm assembly, a valve stem 13, and a drain pressure auxiliary communication pipe 29 assembly.

Wherein, the front check valve is arranged in the main valve body 7, and a P1 pressure cavity 31 is formed between the front check valve and the main valve body 7; the front check valve comprises a front check valve disc 9, a spring seat 10, a spring 11 and a sealing ring I8, the front check valve disc 9 is covered at the water outlet of the main valve body 7, a main valve shaft is transversely fixed on the front check valve disc 9, the spring seats 10 are fixed at the front end and the rear end of the main valve shaft, and the spring 11 is arranged between the spring seats 10.

In addition, in order to ensure tightness, a first sealing ring 8 is fixed between the front check valve disc 9 and the water outlet of the main valve body 7, and specifically, the first sealing ring 8 is installed on the front check valve disc 9.

The auxiliary valve body 17 is connected with the main valve body 7 through a stud 19 and a hexagon nut 20, an O-shaped sealing ring IV 18 is arranged at the joint of the main valve body 7 and the auxiliary valve body 17, a rear check valve is arranged in the auxiliary valve body 17, and a P3 pressure cavity 34 is formed between the rear check valve and the auxiliary valve body 17; similar to the front check valve, the rear check valve comprises a valve seat 14, a rear check valve disc 15, a spring seat 10, a spring 11 and a second sealing ring 12, wherein the valve seat 14 is arranged at the water inlet of the auxiliary valve body 17, an O-shaped sealing ring III 16 is arranged between the valve seat 14 and the auxiliary valve body 17, the rear check valve disc 15 is arranged on the right side of the valve seat 14, the second sealing ring 12 is arranged between the rear check valve disc 15 and the valve seat 14, an auxiliary valve shaft is transversely fixed on the rear check valve disc 15, the spring seats 10 are fixed at the front end and the rear end of the auxiliary valve shaft, and the spring 11 is arranged between the spring seats 10.

A P2 pressure cavity 33 is formed between a main valve body 7 and a secondary valve body 17, a valve groove is formed in the bottom of the P2 pressure cavity 33, a water drain valve is installed in the valve groove at the bottom of the P2 pressure cavity 33, the valve groove is formed on the main valve body 7, the water drain valve comprises a water drain connector 1, a water drain spring 2, a first O-shaped sealing ring 3, a second O-shaped sealing ring 5 and a water drain valve clack 4, the water drain connector 1 is installed at the bottom of the P2 pressure cavity 33, the water drain connector 1 is internally provided with the water drain spring 2, the first O-shaped sealing ring 3 is installed between the water drain connector 1 and the valve groove on the main valve body 7, a water drain port is formed in the top of the water drain connector 1, the second O-shaped sealing ring 5 is sleeved at the bottom of the water drain valve clack 4, the bottom of the water drain connector 1 is in butt joint with the water drain port of the water drain connector 1 through the second O-shaped sealing ring 5, and the top of the water drain valve clack 4 is connected with the bottom of a valve rod 13.

Preferably, the drain connector 1 is of an integral structure connected with the main valve body 7, and the drain connector 1 of the backflow preventer is integrally formed by an original split structure, so that the processing and assembling time is shortened, and the manufacturing cost is reduced.

The partition part is arranged in the top of the P2 pressure cavity 33 and separates the P2 pressure cavity 33 to form a drainage pressure auxiliary cavity, wherein the partition part can be arranged as an integral partition plate connected with the main valve body 7 or as a detachable partition plate connected with the main valve body 7, as shown in fig. 1, and the partition part is an integral partition plate connected with the main valve body 7 in the embodiment.

The diaphragm assembly is disposed in the auxiliary chamber for discharging water pressure and separates the auxiliary chamber for discharging water pressure to form an upper P1 chamber 32 and an upper P3 chamber 35, wherein the upper P1 chamber 32 is communicated with the upper P1 chamber 31 through a channel 30, and the channel 30 is formed on the main valve body 7 as shown in fig. 1.

Specifically, the top of the main valve body 7 is provided with a valve cover 26, and the valve cover 26 is connected with the main valve body 7 through an inner hexagon bolt 27; the diaphragm assembly comprises a diaphragm 22, a diaphragm upper pressing plate 23 and a diaphragm lower pressing plate 21, the edge of the diaphragm 22 is clamped and fixed between a valve cover 26 and the main valve body 7, the upper pressing plate and the lower pressing plate of the diaphragm 22 respectively clamp the centers of the upper surface and the lower surface of the diaphragm 22, the top of a valve rod 13 is sequentially connected with the diaphragm lower pressing plate 21, the diaphragm 22 and the diaphragm upper pressing plate 23, the top of the valve rod 13 is provided with threads, and a hexagonal thin nut 24 is screwed.

The valve rod 13, its bottom and the drain valve clack 4 spiro union of water discharge valve, the junction is equipped with adjusting washer 6 for adjust the elasticity of spiro union, and the top runs through the partition portion and is connected with the diaphragm subassembly, and the effect of valve rod 13 is equivalent to the piston rod, is provided with O type sealing washer five 25 between valve rod 13 top and the partition portion.

The drainage pressure auxiliary communicating pipe 29 assembly has one end communicated with the P3 pressure cavity 34 and the other end communicated with the P3 upper cavity 35. The drain pressure auxiliary communication pipe 29 assembly is integrally or detachably connected with the low-resistance backflow preventer body.

Specifically, in this embodiment, the drain pressure auxiliary communicating tube 29 assembly is detachably connected to the low resistance backflow preventer body, the drain pressure auxiliary communicating tube assembly includes a drain pressure auxiliary communicating tube 29, connecting holes are respectively provided on one side of the upper cavity 35 of P3 and the upper cavity 34 of P3, the connecting holes are respectively connected with a pipe joint 28, and the two pipe joints 28 are connected with the front end and the rear end of the drain pressure auxiliary communicating tube 29.

Preferably, the connection hole is configured as a threaded hole, the pipe joint 28 is configured as a threaded adapter sleeve joint, and both ends of the drain pressure auxiliary communication pipe 29 are respectively connected with the threaded adapter sleeve joint.

Working principle:

aiming at the defect of the water discharge stability of the existing product, the product adopts a backwater pressure to assist the water discharge valve to discharge water, a P3 upper cavity 35 is arranged, a pipeline is additionally led to be communicated with a P3 pressure cavity 34, when the medium water flows into the valve body, the medium water sequentially passes through a P1 pressure cavity 31, a P2 pressure cavity 33 and the P3 pressure cavity 34, when the medium water flows from the P1 pressure cavity 31 to the P2 pressure cavity 33, the pressure of the medium water pushes away a front check valve disc 9, the front check valve disc 9 drives a spring 11 to compress towards the medium water flow direction, and the resistance of the front check valve disc 9 and the reverse acting force of the spring 11 enable P1 to be more than P2 (refer to pressure). When the medium water flows from the P2 pressure chamber 33 to the P3 pressure chamber 34, the pressure of the medium water pushes away the rear check valve disc 15, the rear check valve disc 15 drives the spring 11 to compress in the direction of the medium water flow, and the resistance of the rear check valve disc 15 and the reverse acting force of the spring 11 make P2> P3 (refer to pressure), so that P1> P2> P3 can be known. The pressure of the P1 pressure cavity 31 is conducted to the P1 upper cavity 32 through the channel 30, the P1 upper cavity 32 drives the valve rod 13 to downwards press, and the valve rod 13 drives the water discharge valve clack 4 to seal with the water discharge joint 1. And because of Bernoulli effect (the phenomenon that when the fluid speed is increased, the pressure on the interface of the object and the fluid is reduced, otherwise, the pressure is increased), when the medium water flows through the P3 pressure cavity 34, the pressure of the cavity 35 on the P3 is reduced due to the flow rate of the fluid, the sealing force of the water drain is increased, and the sealing effect is better as the water flow is faster and the force is larger.

When water is stopped, the P1 pressure cavity 31 is in pressure loss, the valve rod 13 is driven by the upper cavity 35 of the P3 to press upwards due to the backwater pressure P3> P1, the valve rod 13 drives the water discharge valve clack 4 and the water discharge spring 2 to break the seal with the water discharge joint 1 under the assistance of the elasticity of the water discharge spring 2, the accumulated water in the P2 pressure cavity 33 is discharged, the P2 pressure cavity 33 is air at the moment, and the space between the P1 pressure cavity 31 and the P3 pressure cavity 34 is blocked by the air in the P2 pressure cavity 33.

The beneficial effects of the utility model are as follows:

according to the low-resistance backflow preventer with the air isolation function, the P3 upper cavity 35 is arranged, the other path of the drainage pressure auxiliary communicating pipe 29 component is led to communicate the P3 upper cavity 35 with the P3 pressure cavity 34, the pressure difference between the P1 pressure cavity 34 and the P3 pressure cavity 34 and the Bernoulli effect are utilized, the P3 upper cavity 35 drives the valve rod 13 to exert pressure upwards, the valve rod 13 drives the drainage valve clack 4 and the drainage joint 1 to break sealing under the assistance of the elastic force of the spring 11, accumulated water in the P2 pressure cavity 33 is discharged, and the problem that the stability of the existing backflow preventer is reduced or the phenomenon that the drainage device is sealed and has short drip when the instantaneous flow speed is too fast is solved; or the spring 11 is deformed for a long time, the elasticity is reduced, and the water can not be drained, so that the service life of the product and the stability of the function are prolonged and improved.

The foregoing description and shows the general principles, features and advantages of the utility model. It will be appreciated by persons skilled in the art that the present utility model is not limited to the embodiments described above, but is capable of numerous variations and modifications without departing from the essential spirit and scope of the utility model, which are intended to fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A low resistance backflow preventer with air blocking function, comprising:

2. The low-resistance backflow preventer with air blocking function according to claim 1, wherein the blocking portion is provided as an integral partition plate connected to the main valve body.

3. A low resistance backflow preventer with air blocking function according to claim 1 wherein the blocking portion is provided as a removable diaphragm connected to the main valve.

4. The low-resistance backflow preventer with air blocking function according to claim 1, wherein the drain pressure auxiliary communication pipe assembly is integrally or detachably connected with the low-resistance backflow preventer.

5. The low-resistance backflow preventer with air isolation function according to claim 1, wherein the water discharge pressure auxiliary communication assembly comprises a water discharge pressure auxiliary communication pipe, connecting holes are formed in one side of the upper cavity of the P3 and the upper cavity of the P3, the connecting holes are respectively connected with pipe joints, and the two pipe joints are connected with the head end and the tail end of the water discharge pressure auxiliary communication pipe.

6. The low-resistance backflow preventer with air blocking function according to claim 5, wherein the connection holes are provided as screw holes, the pipe joints are provided as screw adapter sleeve joints, and both ends of the water discharge pressure auxiliary communicating pipe are respectively connected with the screw adapter sleeve joints.

7. The low resistance backflow preventer with air blocking function according to claim 1, wherein the top of the main valve body is provided with a valve cover; the diaphragm assembly comprises a diaphragm and a diaphragm pressing plate, the edge of the diaphragm is clamped and fixed between the valve cover and the main valve body, the diaphragm pressing plate respectively clamps the centers of the upper surface and the lower surface of the diaphragm, and the top of the valve rod is sequentially connected with the diaphragm and the diaphragm pressing plate.

8. The low-resistance backflow preventer with air blocking function according to claim 7, wherein an O-ring is provided between the valve rod and the blocking portion.

9. The low-resistance backflow preventer with the air isolation function according to claim 1, wherein the water drain valve comprises a water drain connector, a water drain spring, a sealing ring and a water drain valve clack, the water drain connector is arranged at the bottom of the P2 pressure cavity, the water drain spring is arranged in the water drain connector, the water drain connector is provided with a water drain port at the top, the sealing ring is sleeved at the bottom end of the water drain valve clack, the bottom end of the water drain connector is abutted to the water drain port of the water drain connector through the sealing ring, and the top of the water drain valve clack is connected with the bottom of the valve rod.

10. The low resistance backflow preventer with air blocking function of claim 9, wherein the water discharge joint is an integral structure connected to the main valve body.