CN213809020U - Backflow preventer - Google Patents

Abstract

The utility model relates to the technical field of valving, and a backflow preventer is disclosed, including the valve body of intaking, the inside of the valve body of intaking has a cover jar through hole retaining ring fixed mounting, there is the valve clack of intaking at the inside swing joint of cover jar, there is the reset spring of intaking at the right side fixed mounting of the valve clack of intaking, the right side and the cover jar fixed connection of reset spring of intaking, there is a water valve body on the right side of the valve body of intaking through bolt fixed mounting, there is PE water valve clack at the inside sliding connection of the valve body of intaking, there is a water reset spring at the right side fixed mounting of PE water raft lamella, on the right side and the play valve body fixed connection of water reset spring, there is the relief valve in the bottom of the valve body of intaking through nut fixedly connected with. This backflow preventer, through the use of PE play water valve clack, because the play water valve clack density of PE material is less, and the suspension is in the medium, so PE goes out water valve clack and moves and does not have frictional resistance when opening and close the delivery port, the loss of pressure that significantly reduces.

Description

Backflow preventer

Technical Field

The utility model relates to a valve gear technical field specifically is a backflow preventer.

Background

The backflow preventer is a non-return device installed on drinking water or other specific pipes to strictly prevent the downstream medium from flowing back to the upstream. The device mainly comprises a water inlet and outlet valve body, a water inlet and outlet valve clack, a cylinder sleeve, a return spring, a water drain valve, a detection valve and other accessory facilities.

At present, the backflow preventer on the market all opens the first order check valve under certain pressure loss, opens the second level check valve through the same pressure loss again, and pressure loss is great, and loss energy makes backflow preventer's life reduce again.

In order to solve the above problems, the inventors propose a novel backflow preventer having an advantage of reducing pressure loss well, so that the service life of the backflow preventer can be prolonged, thereby effectively improving the practicability of the device.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

To prior art's not enough, the utility model provides a backflow preventer possesses the advantage that can reduce loss of pressure betterly, has solved the great problem of loss of pressure.

(II) technical scheme

For the purpose that can reduce loss of pressure betterly that realizes the aforesaid, the utility model provides a following technical scheme: the backflow preventer comprises a water inlet valve body, wherein a sleeve cylinder is fixedly arranged inside the water inlet valve body through a hole retainer ring, a water inlet valve clack is movably connected inside the sleeve cylinder, a water inlet reset spring is fixedly arranged on the right side of the water inlet valve clack, the right side of the water inlet reset spring is fixedly connected with the sleeve cylinder, a water outlet valve body is fixedly arranged on the right side of the water inlet valve body through a bolt, a PE water outlet valve clack is slidably connected inside the water outlet valve body, a water outlet reset spring is fixedly arranged on the right side of the PE water outlet valve clack, a water outlet reset spring is fixedly connected on the right side of the water outlet reset spring with the water outlet valve body, a pressure relief valve is fixedly connected at the bottom of the water inlet valve body through a nut, a guide sleeve is fixedly arranged at the outlet end of the water inlet valve body, a retainer ring is fixedly arranged inside the water inlet valve body, detection valves are fixedly arranged at the tops of the water inlet valve body and the water outlet valve body, and dial plates are fixedly arranged on the right sides of the detection valves, the water inlet valve body is internally provided with a water drainage channel, the right side of the pressure release valve is fixedly provided with a pipe joint, the right side of the pipe joint is fixedly provided with a bent pipe, the left side of the pressure release valve is fixedly provided with an elbow, and the top of the elbow is fixedly provided with a steel pipe.

Preferably, the three detection valves respectively detect the pressure of the inlet cavity, the middle cavity and the outlet cavity, so that the pressure in the three cavities can be observed conveniently.

Preferably, an annular backflow cavity is formed between the water inlet valve body and the water inlet valve clack, and fluid can enter the middle cavity conveniently.

Preferably, the water drainage channel is communicated with an intermediate cavity in the water inlet valve body, so that fluid in the intermediate cavity can be discharged conveniently.

Preferably, the sleeve cylinder is provided with an overflowing hole, so that the countercurrent fluid can enter the sleeve cylinder. Superior food

And a sealing ring is fixedly arranged between the water inlet valve body and the water outlet valve body, and steps matched with each other are arranged between the water inlet valve body and the water outlet valve body, so that the connection tightness of the water inlet valve body and the water outlet valve body is ensured.

Preferably, the PE water outlet valve flap is made of PE materials, so that the PE water outlet valve flap floats in fluid, and friction force is reduced.

Preferably, the water inlet valve flap is made of PE material.

(III) advantageous effects

Compared with the prior art, the utility model provides a backflow preventer possesses following beneficial effect:

1. this backflow preventer, through the use of PE play water valve clack, because the play water valve clack density of PE material is less, and the suspension is in the medium, so PE goes out water valve clack and moves and does not have frictional resistance when opening and close the delivery port, the loss of pressure that significantly reduces.

2. This backflow preventer, through the use of intaking valve clack and retaining ring, because intake valve body passes through rubber and inclined plane dual seal with the valve clack of intaking, if the rubber seal became invalid, the inclined plane plays secondary seal's effect under backward flow medium pressure and spring action, and the retaining ring can restrict the position of intaking the valve clack.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1-water inlet valve body, 2-water inlet valve clack, 3-water inlet return spring, 4-set cylinder, 5-hole check ring, 6-PE water outlet valve clack, 7-water outlet return spring, 8-detection valve, 9-water outlet valve body, 10-pressure release valve, 11-guide sleeve, 12-check ring, 13-dial, 14-steel pipe, 15-elbow, 16-pipe joint, 17-elbow, 18-water drainage channel, 19-bolt and 20-nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the backflow preventer comprises a water inlet valve body 1, an annular backflow cavity is arranged between the water inlet valve body 1 and a water inlet valve clack 2 to facilitate fluid to enter a middle cavity, a sleeve cylinder 4 is fixedly arranged in the water inlet valve body 1 through a retainer ring 5, an overflowing hole is arranged in the sleeve cylinder 4 to enable the backflow fluid to enter the sleeve cylinder 4, the water inlet valve clack 2 is movably connected in the sleeve cylinder 4, the water inlet valve clack 2 is made of rubber materials and has a certain inclination, a water inlet reset spring 3 is fixedly arranged on the right side of the water inlet valve clack 2, the right side of the water inlet reset spring 3 is fixedly connected with the sleeve cylinder 4, a water outlet valve body 9 is fixedly arranged on the right side of the water inlet valve body 1 through a bolt 19, a sealing ring is fixedly arranged between the water inlet valve body 1 and the water outlet valve body 9, and mutually matched steps are arranged between the water inlet valve body 1 and the water outlet valve body 9,

the connection tightness of the water outlet valve body and the water outlet valve is ensured, the PE water outlet valve clack 6 is connected inside the water outlet valve body 9 in a sliding mode, the PE water outlet valve clack 6 is made of PE materials, the PE water outlet valve clack 6 floats in fluid, friction force is reduced, a water outlet reset spring 7 is fixedly installed on the right side of the PE water outlet valve clack 6, the right side of the water outlet reset spring 7 is fixedly connected with the water outlet valve body 9, a pressure release valve 10 is fixedly connected to the bottom of the water inlet valve body 1 through a nut 20, a guide sleeve 11 is fixedly installed at the outlet end of the water inlet valve body 1, a check ring 12 is fixedly installed inside the water inlet valve body 1, detection valves 8 are fixedly installed at the tops of the water inlet valve body 1 and the water outlet valve body 9, the three detection valves 8 respectively detect the pressure of an inlet cavity, an intermediate cavity and an outlet cavity, the pressure in the three cavities can be observed, a dial 13 is fixedly installed on the right side of the detection valve 8, a water drainage channel 18 is arranged inside the water inlet valve body 1, the water drainage channel 18 is communicated with the middle cavity in the water inlet valve body 1 to facilitate discharging of fluid in the middle cavity, a pipe joint 16 is fixedly installed on the right side of the pressure release valve 10, an elbow 17 is fixedly installed on the right side of the pipe joint 16, an elbow 15 is fixedly installed on the left side of the pressure release valve 10, and a steel pipe 14 is fixedly installed on the top of the elbow 15.

The working principle is as follows: when the backflow preventer is used, when fluid enters, the fluid pushes the water inlet valve clack 2, the water inlet valve clack 2 moves to push the water inlet reset spring 3 to move transversely in the sleeve cylinder 4, an annular backflow cavity is formed between the water inlet valve body 1 and the water inlet valve clack 2, the fluid enters the middle cavity through the backflow cavity to push the PE water outlet valve clack 6 to open transversely along the water outlet valve body 9, the fluid enters the water outlet valve body 9 through the opening gap and flows into a downstream pipeline, when the pressure at the outlet end rises suddenly, the fluid flows back to enter between the water inlet valve clack 2 and the cylinder sleeve 4 through the overflow hole of the bottom plate of the sleeve cylinder 4, and pushes the water inlet valve clack 2 under the combined action of the water inlet return spring 3, immediately closing the valve, opening the bottom pressure release valve 10 to release water, reducing the pressure of the middle cavity, closing the PE water outlet valve clack 6 under the action of backflow fluid pressure and the water outlet reset spring 7, and realizing the function of preventing the fluid from flowing backwards.

To sum up, this backflow preventer, through the use of PE play water valve clack 6, because the play water valve clack density of PE material is less, and the suspension is in the medium, so PE goes out water valve clack 6 and moves and does not have frictional resistance when opening and close the delivery port, the pressure loss that significantly reduces.

This backflow preventer, through the use of intaking valve clack 2 and retaining ring 12, because intake valve body 1 passes through rubber and inclined plane dual seal with intaking valve clack 2, if the rubber seal became invalid, the inclined plane plays the effect of secondary seal under backward flow medium pressure and spring action, and retaining ring 12 can restrict the position of intaking valve clack 2.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. Backflow preventer, including intake valve body (1), its characterized in that: the water inlet valve is characterized in that a sleeve cylinder (4) is fixedly arranged in the water inlet valve body (1) through a hole check ring (5), a water inlet valve clack (2) is movably connected in the sleeve cylinder (4), a water inlet reset spring (3) is fixedly arranged on the right side of the water inlet valve clack (2), the right side of the water inlet reset spring (3) is fixedly connected with the sleeve cylinder (4), a water outlet valve body (9) is fixedly arranged on the right side of the water inlet valve body (1) through a bolt (19), a PE water outlet valve clack (6) is slidably connected in the water outlet valve body (9), a water outlet reset spring (7) is fixedly arranged on the right side of the PE water outlet valve clack (6), the right side of the water outlet reset spring (7) is fixedly connected with the water outlet valve body (9), a pressure release valve (10) is fixedly connected to the bottom of the water inlet valve body (1) through a nut (20), and a guide sleeve (11) is fixedly arranged at the outlet end of the water inlet valve body (1), there is retaining ring (12) at the inside fixed mounting of the valve body of intaking (1), there are check valve (8) at the equal fixed mounting in top of the valve body of intaking (1) and outlet valve body (9), there are dial plate (13) at the equal fixed mounting in right side of check valve (8), sluicing passageway (18) have been seted up to the inside of the valve body of intaking (1), there are coupling (16) at the right side fixed mounting of relief valve (10), there are return bend (17) at the right side fixed mounting of coupling (16), there are elbow (15) at the left side fixed mounting of relief valve (10), there are steel pipe (14) at the top fixed mounting of elbow (15).

2. A backflow preventer according to claim 1, wherein: the three detection valves (8) respectively detect the pressure of the inlet cavity, the middle cavity and the outlet cavity.

3. A backflow preventer according to claim 1, wherein: an annular backflow cavity is formed between the water inlet valve body (1) and the water inlet valve clack (2).

4. A backflow preventer according to claim 1, wherein: the water drainage channel (18) is communicated with the middle cavity in the water inlet valve body (1).

5. A backflow preventer according to claim 1, wherein: the sleeve cylinder (4) is provided with an overflowing hole.

6. A backflow preventer according to claim 1, wherein: a sealing ring is fixedly arranged between the water inlet valve body (1) and the water outlet valve body (9), and steps matched with each other are arranged between the water inlet valve body and the water outlet valve body.

7. A backflow preventer according to claim 1, wherein: the PE water outlet valve clack (6) is made of PE materials.

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