CN2151319Y

CN2151319Y - Conversely impact pneumatic valve

Info

Publication number: CN2151319Y
Application number: CN 93230379
Authority: CN
Inventors: 杨兆旭
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-09
Filing date: 1993-03-09
Publication date: 1993-12-29
Anticipated expiration: 2003-03-09

Abstract

The utility model discloses a valve for automatic control. The valve for automatic control is a conversely impact type pneumatic valve which is driven by compressed air. The anti-structure of a normal pneumatic valve is adopted by the valve for automatic control, i.e.a film sheet is positioned on the top of a film sheet seat, and a valve core and a valve core seat are positioned inside a medium material feeding cavity inside a valve body. When the pressure of a medium exceeds a specified pressure, the sealed performance of the valve core and the valve core seat is better, and thus, the defect of the normal pneumatic valve is overcome. The utility model has the advantages of simple structure, convenient operation, high reliability, long service life, and convenient manufacture and maintenance.

Description

Conversely impact pneumatic valve

The utility model discloses a kind of automatic control valve, is the backflushing type pneumatic valve by compressed air-driven.

Production at present and the diaphragm type pneumatic valve that uses, its structure and working principle are roughly the same, it is the top that pressure spring is positioned at diaphragm seat and diaphragm, valve rod one end and diaphragm seat, diaphragm are fixed as one, the valve rod the other end is equipped with spool, under the effect of pressure spring, the valve core case sealing on spool and the valve body contacts, and spool and valve core case are positioned at the discharging chamber of valve body.When need were opened valve, pressurized air entered air chamber, acted on the diaphragm, promote to move on the diaphragm seat by diaphragm, and make spool separate valve open with valve core case, medium by the gap between spool and valve core case, enters the discharging chamber to outlet then by feed cavity in the valve body.When the needs throttle down, pressurized air stops air feed, and diaphragm seat and diaphragm promote the valve rod spool and move down under the effect of pressure spring, and spool is contacted with the valve core case sealing.The pneumatic valve of this structure, in use have the following disadvantages, the first, this pneumatic valve sealing is unreliable, and this valve all has a maximum pressure medium that can seal when design, it is design pressure, when the pressure of medium surpassed the design pressure of regulation, then the active force that acts on the spool of medium reached the counter-force that is enough to overcome pressure spring, then promotes to move on the spool, medium then by entering the discharging chamber in the space to outlet, makes the valve seal failure.The second, diaphragm is changed trouble, and working life is short.Because diaphragm is installed in diaphragm seat bottom, valve rod passes diaphragm, is fixed as one with diaphragm seat and diaphragm, and diaphragm is provided with the hole during fabrication, must earlier the diaphragm seat be taken off when changing diaphragm simultaneously, makes when keeping in repair than trouble.

The purpose of this utility model is to provide a kind of backflushing type pneumatic valve, and reliable operation is not subjected to the variation of pressure medium and influences the stability of work, makes simply, easy to maintenance, prolongs working life of diaphragm.

In order to achieve the above object, the utility model has adopted following technical measures:

The backflushing type pneumatic valve, be grouped into by air chamber part and valve body, the centre is connected as a single entity through connecting sleeve, diaphragm is housed in the air chamber, the diaphragm seat, valve rod and pressure spring, valve rod one end is connected with the diaphragm seat, the other end is equipped with spool, spool is positioned at valve body, and spool and valve core case are divided into feed cavity and discharging chamber with valve body, and its difference diaphragm 3 is positioned at the top of diaphragm seat 4, corresponding with compressed air inlet port 1 set on the air chamber cover, pressure spring 5 is equipped with in diaphragm seat 4 bottoms, and valve rod 7 upper ends are connected with diaphragm seat 4, and valve rod 7 is contained in air chamber and the valve body connecting sleeve, valve rod 7 lower end fixed spools 11, spool 11 is positioned at valve body feed cavity 12 with valve core case 10.

Above mentioned spool 11, seal face contacts throttle down with the lower end surface sealing of valve core case on it.

In order to further specify characteristics of the present utility model, described below in conjunction with accompanying drawing:

Fig. 1 backflushing type pneumatic valve configurations schematic representation;

Among the figure: 10 valve core cases, 11 spools, 12 feed cavity, 13 body caps of 1 compressed air inlet port, 2 air chambers, 3 diaphragms, 4 diaphragm seats, 5 pressure springs, 6 connecting sleeves, 7 valve rods, 8 valve bodies, 9 discharging chambeies.

The course of work of the present utility model as shown in drawings. Be illustrated as the situation of this pneumatic operated valve closed condition, in the air chamber of this valve, compression spring is in its pre-compressed state, it is used in the preact masterpiece on the diaphragm seat, and the diaphragm seat is upwards drawn, and the diaphragm seat is passed to spool with the power that makes progress by valve rod, make the upper surface of spool be close to the lower surface of valve core case, the sealing contact, medium can not pass through, thereby valve is closed. When needs are opened valve, the compressed air of certain pressure is entered in the air chamber by air inlet of air chamber, compressed gas acts on the diaphragm, make diaphragm produce downward thrust, when thrust during even as big as the counter-force that overcomes spring and other resistance sum then the diaphragm seat be pushed down, band valve rod and spool move down, spool is separated with valve core case, valve open, medium then by the space of feed cavity between spool and valve core case, advance Enter the discharging chamber to outlet. When the compressed air in the air chamber released, Compress Spring made again on the diaphragm seat and moves, and the pulling spool is adjacent on valve core case, and valve is namely closed.

The utility model has following advantage compared with the prior art:

1, reliable operation

Spool of the present utility model and valve core case are positioned at feed cavity, and when pressure medium surpassed authorized pressure, the thrust that medium acts on the spool was more big, and it is more reliable that spool and valve core case seal, and sealability is just more good.

Spool and valve core case are positioned at the discharging chamber in the prior art, when pressure medium surpasses design pressure, just can back down spool, make seal failure.

2, manufacturing, easy to maintenance

Diaphragm of the present utility model is positioned at the top of diaphragm seat, replacing, easy for installation.

In the prior art, diaphragm is positioned at the bottom of diaphragm seat, changes trouble is installed.

3, long service life

Diaphragm of the present utility model is an integrated type, is placed on diaphragm seat top, convenient processing and manufacture, long service life.

The diaphragm of prior art is placed on diaphragm seat bottom, and valve rod passes with the diaphragm seat and is connected, thereby must be provided with machining hole on the diaphragm, makes complexity, reduces the intensity of diaphragm simultaneously, and working life is short.

Embodiment:

But adopt the valve of the principle design specification of backflushing type pneumatic valve, following mask body is introduced three kinds:

Embodiment 1:

Air chamber structure is an aluminum casting, and valve body is a copper casting, and connection mouth is that pipe thread connects, and is fit in the pipe-line system of medium and small caliber and lower pressure.

Embodiment 2:

Air chamber is stamped to form by steel plate, and diaphragm is a flat garden diaphragm, is fit in enormous quantities the manufacturing.

Embodiment 3:

Valve body adopts stainless cast steel part, and the flanged dish of connection mouth uses in the pipe-line system of suitable big caliber and elevated pressures.

Claims

1, a kind of backflushing type pneumatic valve, be grouped into by air chamber part and valve body, the centre is connected as a single entity through connecting sleeve 6, diaphragm 3 is housed in the air chamber 2, diaphragm seat 4, valve rod 7 and pressure spring 5, valve rod one end is connected with the diaphragm seat, the other end is equipped with spool 11, spool is positioned at valve body 8, spool 11 is divided into feed cavity 12 and discharging chamber 9 with valve core case 10 with valve body, it is characterized in that diaphragm 3 is positioned at the top of diaphragm seat 4, corresponding with compressed air inlet port 1 set on the air chamber cover, pressure spring 5 is equipped with in diaphragm seat 4 bottoms, and valve rod 7 upper ends are connected with diaphragm seat 4, and valve rod 7 is contained in air chamber and the valve body connecting sleeve, valve rod 7 lower end fixed spools 11, spool 11 is positioned at valve body feed cavity 12 with valve core case 10.

2, backflushing type pneumatic valve according to claim 1 is characterized in that the last seal face of spool contacts with the lower end surface sealing of valve seat.