CN210566445U

CN210566445U - Low resistance backflow preventer that leakproofness is good

Info

Publication number: CN210566445U
Application number: CN201921299486.8U
Authority: CN
Inventors: 李陈燕; 郑成超
Original assignee: Shanghai Yucheng Fluid Control Co ltd
Current assignee: Shanghai Yucheng Fluid Control Co ltd
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2020-05-19
Anticipated expiration: 2029-08-12

Abstract

The utility model discloses a low resistance backflow preventer with good sealing performance, which comprises a backflow preventer body, wherein the backflow preventer body comprises a main valve body and an auxiliary valve body, one side of the main valve body is fixedly provided with the auxiliary valve body through bolts, a rear check valve seat is arranged in the auxiliary valve body, one side of the rear check valve seat is provided with a rear check valve disc, an arc-shaped rubber pad is fixedly arranged at the joint position of the rear check valve seat and the rear check valve disc, the rear check valve disc is arranged at one side of the arc-shaped rubber pad in an arc-shaped structure, a drain valve seat is arranged at the bottom of the backflow preventer body, a valve rod is arranged in the drain valve seat in a sliding manner, a ring is fixedly arranged on the surface of the valve rod, a framework sealing ring is fixedly arranged in the ring, springs are symmetrically arranged between the ring and the drain valve seat, the stress is even when the arc structure is pressed, and the sealing performance is enhanced.

Description

Low resistance backflow preventer that leakproofness is good

Technical Field

The utility model relates to a backflow preventer technical field specifically is a low resistance backflow preventer that the leakproofness is good.

Background

The backflow preventer is a hydraulic control combination device which strictly limits the water in the pipeline to flow in one direction under the condition that the backflow pollution of tap water supply equipment, particularly domestic drinking water pipelines is serious and no device for effectively preventing backflow pollution is available. At present, the backflow preventer mainly comprises a low-resistance backflow preventer and a pressure-reducing backflow preventer, the head loss of the low-resistance backflow preventer according to the national standard is less than 3 meters, and the head loss of the pressure-reducing backflow preventer is less than 7 meters.

Along with the increase of backflow preventer service life, some closely consolidate the position and can begin to appear not hard up, and the condition above the great fluctuation can appear in valve front end pressure sometimes all can cause the sluicing phenomenon.

Disclosure of Invention

The utility model aims to provide a low resistance backflow preventer that leakproofness is good sets up back check valve disc and back check valve seat laminating position as arc structure to set up the rubber packing ring in arc structure hookup location, increase back check valve disc and back check valve seat area of contact, and the atress is even when the arc structure pressfitting, reinforcing sealing performance; the valve rod and the drain valve seat are applied with certain elastic acting force through the spring, the resistance force of the downstream water pressure is increased, and the backflow is prevented, so that the problems in the background art are solved.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a low resistance backflow preventer that leakproofness is good, includes backflow preventer body, backflow preventer body includes the main valve body and the auxiliary valve body, there is the auxiliary valve body main valve body one side through bolt fixed mounting, be provided with back non return disk seat in the auxiliary valve body, back non return disk seat one side is provided with back non return valve dish, back non return disk seat and back non return valve dish laminating position fixed mounting have the arc rubber pad, back non return valve dish is located arc rubber pad one side and is the arc structure setting, backflow preventer body bottom is provided with the sluicing disk seat, slidable mounting has the valve rod in the sluicing disk seat, valve rod fixed surface installs the ring, fixed mounting has the skeleton sealing washer in the ring, the spring is installed to the symmetry between ring and the sluicing disk seat.

Preferably, an O-shaped sealing ring is fixedly installed at the connecting position of the rear check valve seat and the rear check valve disc.

Preferably, a counter bore is formed in the circular ring, the framework sealing ring is fixedly installed in the counter bore, and the framework sealing ring is in interference fit with the valve rod.

Preferably, a guide sleeve is fixedly installed on one side, located on the drain valve seat, of the spring, a guide rod is fixedly connected to the bottom of the circular ring of the spring, and the guide rod is slidably installed in the guide sleeve.

Preferably, the rear check valve seat is provided with an arc-shaped bulge at the joint position of the arc-shaped rubber pad.

Preferably, one side of the rear check valve disc is positioned at the joint position of the arc-shaped rubber pad and is provided with a clamping groove.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the joint positions of the rear check valve disc and the rear check valve seat are both set to be arc-shaped structures, and rubber gaskets are arranged at the connection positions of the arc-shaped structures, so that the contact area of the rear check valve disc and the rear check valve seat is increased, the stress is uniform when the arc-shaped structures are pressed, and the sealing performance is enhanced;

2. certain elastic acting force is applied between the valve rod and the water drain valve seat through the spring, the resistance force of the downstream water pressure is increased, and backflow is prevented.

Drawings

FIG. 1 is a schematic view of the partial sectional structure of the present invention;

fig. 2 is a schematic view of the structure of the present invention;

fig. 3 is an enlarged schematic structural view of a portion a in fig. 1 according to the present invention;

fig. 4 is an enlarged schematic structural diagram of a portion B in fig. 1 according to the present invention.

In the figure: 1. a backflow preventer body; 2. a main valve body; 3. a sub-valve body; 4. a rear check valve seat; 5. a rear check valve disc; 6. an arc-shaped rubber pad; 7. a water drain valve seat; 8. a valve stem; 9. a circular ring; 10. a skeleton sealing ring; 11. a spring; 12. an O-shaped sealing ring; 13. a counter bore; 14. a guide sleeve; 15. a guide bar; 16. an arc-shaped bulge; 17. a clamping groove.

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. 1-4, the present invention provides a technical solution: a low-resistance backflow preventer with good sealing performance comprises a backflow preventer body 1, wherein the backflow preventer body 1 comprises a main valve body 2 and an auxiliary valve body 3, one side of the main valve body 2 is fixedly provided with the auxiliary valve body 3 through bolts, a rear check valve seat 4 is arranged in the auxiliary valve body 3, one side of the rear check valve seat 4 is provided with a rear check valve disc 5, the joint positions of the rear check valve seat 4 and the rear check valve disc 5 are fixedly provided with an arc-shaped rubber pad 6, the rear check valve disc 5 is arranged on one side of the arc-shaped rubber pad 6 and is in an arc-shaped structure, the joint surface of the rear check valve disc 5 and the rear check valve seat 4 is arranged in an arc-shaped structure and is provided with the arc; the backflow preventer body 1 is provided with a drain valve seat 7 at the bottom, a valve rod 8 is slidably mounted in the drain valve seat 7, a circular ring 9 is fixedly mounted on the surface of the valve rod 8, a framework sealing ring 10 is fixedly mounted in the circular ring 9, the framework sealing ring 10 is arranged, the deformation resistance is strong, and the sealing performance between the drain valve seat 7 and the valve rod 8 is enhanced; springs 11 are symmetrically arranged between the circular ring 9 and the drain valve seat 7, the springs 11 are arranged, certain elastic acting force is applied between the valve rod 8 and the drain valve seat 7, the resistance force of down-flow water pressure is increased, and backflow is prevented.

Specifically, an O-shaped sealing ring 12 is fixedly arranged at the connecting position of the rear check valve seat 4 and the rear check valve disc 5, and the O-shaped sealing ring 12 is arranged to increase the sealing performance.

Specifically, a counter bore 13 is formed in the ring 9, the framework sealing ring 10 is fixedly installed in the counter bore 13, the framework sealing ring 10 and the valve rod 8 are in interference fit, and the counter bore 13 is formed, so that the framework sealing ring 10 is convenient to fix.

Specifically, be located outlet valve seat 7 one side fixed mounting in the spring 11 and have uide bushing 14, and lie in ring 9 bottom fixedly connected with guide bar 15 in the spring 11, guide bar 15 slidable mounting sets up guide bar 15 slidable mounting in uide bushing 14 in the uide bushing 14, increases the stability of spring 11 effort.

Specifically, back non return disk seat 4 is located 6 laminating positions of arc rubber pad and is provided with arc arch 16, sets up arc arch 16, increases its laminating degree with arc rubber pad 6.

Specifically, back non return valve disc 5 one side is located 6 laminating positions of arc rubber pad and has been seted up draw-in groove 17, sets up draw-in groove 17, clamps 6 parcel formulas of arc rubber pad, and stability is high.

The structure principle is as follows: the jointing positions of the rear check valve disc 5 and the rear check valve seat 4 are both set to be arc-shaped structures, and arc-shaped rubber pads 6 are arranged at the connecting positions of the arc-shaped structures, so that the contact area of the rear check valve disc 5 and the rear check valve seat 4 is increased, the stress is uniform when the arc-shaped structures are pressed, and the sealing performance is enhanced;

certain elastic acting force is applied between the valve rod 8 and the drain valve seat 7 through the spring 11, the resistance force of downstream water pressure is increased, and backflow is prevented.

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

1. The utility model provides a low resistance backflow preventer that leakproofness is good, includes backflow preventer body (1), its characterized in that: the backflow preventer body (1) comprises a main valve body (2) and an auxiliary valve body (3), an auxiliary valve body (3) is fixedly arranged on one side of the main valve body (2) through a bolt, a rear check valve seat (4) is arranged in the auxiliary valve body (3), a rear check valve disc (5) is arranged on one side of the rear check valve seat (4), an arc-shaped rubber pad (6) is fixedly arranged at the joint position of the rear check valve seat (4) and the rear check valve disc (5), the rear check valve disc (5) is positioned at one side of the arc-shaped rubber pad (6) and is arranged in an arc-shaped structure, a water drain valve seat (7) is arranged at the bottom of the backflow preventer body (1), a valve rod (8) is arranged in the drain valve seat (7) in a sliding way, a circular ring (9) is fixedly arranged on the surface of the valve rod (8), the ring (9) internal fixed mounting has skeleton sealing washer (10), spring (11) are installed to the symmetry between ring (9) and sluicing valve seat (7).

2. A low resistance backflow preventer as claimed in claim 1, wherein the backflow preventer comprises: and an O-shaped sealing ring (12) is fixedly arranged at the connecting position of the rear check valve seat (4) and the rear check valve disc (5).

3. A low resistance backflow preventer as claimed in claim 1, wherein the backflow preventer comprises: a counter bore (13) is formed in the circular ring (9), the framework sealing ring (10) is fixedly installed in the counter bore (13), and the framework sealing ring (10) is in interference fit with the valve rod (8).

4. A low resistance backflow preventer as claimed in claim 1, wherein the backflow preventer comprises: a guide sleeve (14) is fixedly installed on one side, located on the drain valve seat (7), of the spring (11), a guide rod (15) is fixedly connected to the bottom of the circular ring (9) of the spring (11), and the guide rod (15) is slidably installed in the guide sleeve (14).

5. A low resistance backflow preventer as claimed in claim 1, wherein the backflow preventer comprises: and an arc-shaped bulge (16) is arranged at the joint position of the rear check valve seat (4) on the arc-shaped rubber pad (6).

6. A low resistance backflow preventer as claimed in claim 1, wherein the backflow preventer comprises: one side of the rear check valve disc (5) is positioned at the joint position of the arc-shaped rubber pad (6) and is provided with a clamping groove (17).