CN101749461A

CN101749461A - Screw-thread backflow prevention device being free from being equipped with external conduit

Info

Publication number: CN101749461A
Application number: CN200810154056A
Authority: CN
Inventors: 刘永
Original assignee: 刘永; 刘庆
Current assignee: Tianjin Guowei Feeding & Drainage Equipment Ment Manufacturing Co., Ltd.
Priority date: 2008-12-15
Filing date: 2008-12-15
Publication date: 2010-06-23
Anticipated expiration: 2028-12-15
Also published as: CN101749461B

Abstract

The invention provides a screw-thread backflow prevention device being free from being equipped with an external conduit, which comprises an inlet water non-return water escape valve, an outlet water check valve and a connection port, wherein the inlet water non-return water escape valve, the outlet water check valve and the connection port are communicated with each other; a diaphragm is arranged inside a control chamber of the water escape valve, the diaphragm is flatly paved on the top end surface of a press plate to be covered by a lower cover and to be tightened onto a valve body of the water escape valve through bolt so as to form a control cavity, and water of a water inlet of the inlet water no-return valve flows through a through hole on the valve body and also flows through a through hole on the valve body of the water escape valve to enter the control cavity. The screw-thread backflow prevention device as the advantages that the backflow prevention device of the above structure is of a combination device which strictly limits that the pressure medium inside the pipeline flows in a single direction, the structure is compact, and the installation space can be saved; and the backflow medium inside the pipeline or the medium staying at the critical backflow state can be guided outside the pipe under any working conditions, and the air separation can be formed without any external accessory, so the device is free from the malicious damage, can ensure the safety of the water supply and can prevent the pollution.

Description

The screw thread type backflow preventer that need not join conduit outward

Technical field

The present invention relates to a kind of valve mechanism, particularly a kind of screw thread type backflow preventer.

Background technique

Present backflow preventer safety check adopts " Y " type direct current type structure, structure is longer, a lot of improvement projects can not be carried out as scheduled owing to dimensional problem, drain valve adopts the structure in " post " shape cavity configuration or " cucurbit " shape chamber, single-iris structural type is adopted in the control room, and all control bypass tubes all adopt plug-in pipe arrangement.This structure makes its loss of head be generally 7-9 rice on the one hand, do not obtain to break through because there is the important structure design problem, so can't reduce its loss of head, under existing water supply conditions as use this infrastructure product, because loss of head greatly then has too many user can not drink tap water, this is the major reason that this series products can not be promoted, on the other hand when diaphragm has damage, be difficult to judge whether refluence water enters the upstream by bypass line, be unfavorable for water supply security, bypass tube is a weak spot, loses easily, destroyed, or utilized by the bad person and to poison, be the unsolved so far fatal problem of this series products, national governments know the significance of this type product perfectly well, but can't guarantee resident's water safety, make whole urban water supply bring great potential safety hazard because of the deadly defect of this series products.

Summary of the invention

For solving the problem that exists in the above-mentioned technology, the present invention can reach really energy-conservation, safe, anti-pollution by a kind of screw thread type backflow preventer that need not join conduit outward is provided, and takes up an area of little purpose.

A kind of screw thread type backflow preventer that need not join conduit outward, a kind of screw thread type backflow preventer that need not join conduit outward, this backflow preventer includes into water non-return drain valve and goes out Water Check Valve, described part is communicated with, it is characterized in that: described water inlet non-return drain valve includes valve body one (1), valve plate one (4), spring one (3), valve rod one (2); The valve rod one (2) of described water inlet safety check is separately positioned on valve body one (1) water inlet oral area, described valve plate one (4) moves right during open valve, valve plate one (4) is moved to the left and is close to valve seat during cut-off valve, be provided with diaphragm (11) in its control room, sealing gasket (12), cover and be fastened on the into valve body lower portion of water non-return drain valve with lower cover (10), form control chamber, the water of the water intake of water inlet non-return drain valve directly enters the control room epicoele by the through hole on this valve body one (1) and by through hole on the water outlet non-return drain valve valve body, and does not need by any external pipe arrangement; The valve body one (1) of water inlet non-return drain valve is with valve body two (8) the fastening and connections of described water outlet non-return drain valve; There are valve plate two (7) and sealing base thereof in the centre of valve body one (1) and valve body two (8), and described safety check valve plate two (7) moves right during open valve, and safety check valve plate two (7) is moved to the left and is close to sealing base during cut-off valve; ,

Effect of the present invention is that the backflow preventer of this structure is a kind of strict composite set that ducted pressure medium is made one-way flow that limits, it can satisfy under any operating mode all and ducted refluence medium or the medium that is in critical refluence " can be led " to go out outside the pipe, guarantee water supply security, prevent to pollute.The low water head loss is guaranteed in straight-through type, big area of passage design; The super-short structure guarantees to save installing space; Two diaphragms control room guarantees when diaphragm damages to guarantee that upper and lower cavity do not scurry logically, and is beneficial to and observes and change rapidly diaphragm.

Description of drawings

Fig. 1 is the sectional view of structure of the present invention;

Fig. 2 is the sectional view of drain valve structure of the present invention.

Embodiment

Reaching embodiment in conjunction with the accompanying drawings is illustrated the screw thread type backflow preventer structure that need not join conduit outward of the present invention.

The screw thread type backflow preventer that need not join conduit outward is the structure that the technical field important breakthrough is arranged.

As shown in Figure 1, 2, arrow is represented the media flow direction among Fig. 1.A kind of screw thread type backflow preventer, this backflow preventer include into water non-return drain valve, go out Water Check Valve and interface, it is characterized in that: with described water inlet non-return drain valve valve body one (1) and to go out the valve body two (8) of Water Check Valve fastening and be communicated with; The valve rod one (2) of described water inlet non-return drain valve is separately positioned on valve body one (1) water intake, and described valve plate one (4) moves right during open valve, and valve plate one (4) is moved to the left and is close to pedestal during cut-off valve; The water of the water intake of water inlet non-return drain valve is by the through hole on this valve body one (1) and enter the control room, and do not need by any external pipe arrangement, when pressure water action on diaphragm (11), all can promote diaphragm (11) and realize making knee-action, close or open discharge opening.

Valve plate one (4) and valve plate two (7) move right during open valve, and two valve plates are moved to the left and are close to pedestal separately during cut-off valve; , during proper flow, medium from entrance point flow through into water non-return drain valve, go out the Water Check Valve valve port, flow to the waterexit end, diaphragm this moment (11) promotes water inlet sealing gasket (12) and closes, two groups of safety check are normally opened, and supply water forward.

Shown in figure two, valve plate one (4) and valve plate two (7) are moved to the left and are close to pedestal separately when cutting off the water cut-off valve; This moment, two water promotion diaphragms (11) that are used as between the valve plate of non-return moved downward, and promoted sealing gasket (12) and opened, and began to sluice.

Claims

1. the screw thread type backflow preventer that need not join conduit outward, this backflow preventer includes into water non-return drain valve and goes out Water Check Valve, described part is communicated with, and it is characterized in that: described water inlet non-return drain valve includes valve body one (1), valve plate one (4), spring one (3), valve rod one (2); The valve rod one (2) of described water inlet safety check is separately positioned on valve body one (1) water inlet oral area, described valve plate one (4) moves right during open valve, valve plate one (4) is moved to the left and is close to valve seat during cut-off valve, be provided with diaphragm (11) in its control room, sealing gasket (12), cover and be fastened on the into valve body lower portion of water non-return drain valve with lower cover (10), form control chamber, the water of the water intake of water inlet non-return drain valve directly enters the control room epicoele by the through hole on this valve body one (1) and by through hole on the water outlet non-return drain valve valve body, and does not need by any external pipe arrangement; The valve body one (1) of water inlet non-return drain valve is with valve body two (7) the fastening and connections of described water outlet non-return drain valve; There are valve plate two (7) and sealing base thereof in the centre of valve body one (1) and valve body two (8), and described safety check valve plate two (7) moves right during open valve, and safety check valve plate two (7) is moved to the left and is close to sealing base during cut-off valve.

2. the screw thread type backflow preventer that need not join conduit outward according to claim 1, it is characterized in that: described water inlet non-return drain valve control chamber is below this method valve body, diaphragm is opened pressure release downwards, upwards close and stop pressure release, the sealing surface that the drain valve sealing gasket is contacted is an one with water inlet non-return drain valve valve body.

3. the screw thread type backflow preventer that need not join conduit outward according to claim 1, it is characterized in that: the check valve plate that its inside has two non-returns to use, water inlet non-return drain valve safety check valve plate one (1) with go out that the bottom has one as the hole that sluices between the Water Check Valve valve plate two (7), this Kong Youyi hydraulic control mechanism controlled and closed and open pressure release.

4. the screw thread type backflow preventer that need not join conduit outward according to claim 1 is characterized in that: the water of the water intake of water inlet non-return Decompression valves enters the control room epicoele by the through hole on this valve body one (1), need not plug-in accessory.

5. the screw thread type backflow preventer that need not join conduit outward according to claim 1, it is characterized in that: the bottom discharge opening of described water outlet non-return drain valve (a figure part) is scraggly out-of-flatness cylndrical surface, can go into air from a large amount of benefits in the discharge opening joint, bottom of collection bucket (9) and water outlet non-return drain valve to guarantee air, sluice smoothly thereby make, (figure two parts), with the surface of contact of diaphragm pressure ring be interrupted surface of contact, smooth and easy guarantee to sluice.