CN2239551Y

CN2239551Y - Automatic-closing gas safety valve

Info

Publication number: CN2239551Y
Application number: CN 95222730
Authority: CN
Inventors: 宋秀峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-09
Filing date: 1995-10-09
Publication date: 1996-11-06
Anticipated expiration: 2005-10-09

Abstract

The utility model relates to an automatic closing gas safety valve, which is provided with a front valve casing 9, a rear valve casing 5, a gas inlet interface 11, and a gas outlet interface 8. The utility model is characterized in that the gas inlet interface is provided with a valve seat 12, a sealing strip 6 is arranged between the two valve casings, and a valve core 14 on the sealing strip 6 is seated on the valve seat by the force of a spring 4; when the gas inlet is communicated with the gas, and the valve core can not be pushed and can not be opened by the gas; when the pull rod 2 is pulled, the valve coreis moved towards the left, and the valve is opened; as the sealing strip is under the action of the gas pressure, the valve can be opened normally. When the gas is accidentally closed or cut off, or the gas outlet hose is broken, the pressure in the front cavity is dropped, and the valve is closed by the force of the spring; when the gas comes again, the valve can be opened, and the safety protection function can be realized.

Description

The automatic close-type safety valves for gas

The utility model relates to engineering element or parts, particularly valve, tap, cock.

Existing domestic gas system is that valve used on pipeline or the kitchen range all is manually to open and close, and under abnormal conditions, can not control automatically.For example after pipeline is stopped the supple of gas or steam suddenly; because it is the operator forgets throttle down, can cause combustion gas to leak outside in a large number when coming gas again, aging as flexible pipe in addition; come off; when breaking, because of no automatic safe protective device, combustion gas also can be leaked in a large number in indoor; indoor when having a large amount of combustion gas to exist; because the automatic startup of household electric appliance, manually start or when other naked lights are arranged, will cause very big infringement the people and property.

The purpose of this utility model is to overcome the problems referred to above, provide a kind of can be at the automatic close-type safety valves for gas of automatic self-closing gas pipeline under the abnormal conditions.

The purpose of this utility model realizes by following technological scheme.

Automatic close-type safety valves for gas of the present utility model, has preceding valve casing, the back valve casing that is connected with preceding valve casing, before, has cavity between the back valve casing, safety valve also has intake interface and the interface of giving vent to anger, it is characterized in that the intake interface place has valve seat, before, the elastic sealing strip that described cavity is divided into preceding cavity and back cavity is housed between the back valve casing, the said intake interface and the interface of giving vent to anger communicate with preceding cavity, has the spool that seals mutually with valve seat on the diaphragm seal, also have with the back valve casing and be slidingly matched, one end stretches out the pull bar that the back valve casing the other end links to each other with diaphragm seal in the cavity of back, the elastic element on diaphragm seal of suppressing with in the cavity of said back has vent on the back valve casing.

When combustion gas enters intake interface; gaseous-pressure can not be opened spool; having only when the people spurs pull bar opens spool; the cavity that combustion gas enters; pressure acts on and has overcome spring force on the diaphragm seal and valve is often left; this moment can be by the interface gas of giving vent to anger; when combustion gas is closed or accident is stopped the supple of gas or steam; or the hose fracture of the interface end of giving vent to anger and pressure are when descending; before air pressure in the cavity all can descend and spring pushes up back valve seat with spool and seals; even spool can not opened yet when coming gas again, therefore played the safety protection effect.

Below, in conjunction with the accompanying drawings and embodiments, automatic close-type safety valves for gas of the present utility model is explained in detail.

Fig. 1 is the structural representation of the utility model automatic close-type safety valves for gas;

Fig. 2 be the utility model automatic close-type safety valves for gas along the A among Fig. 1 to view;

Fig. 3 is the sectional view of the elastic sealing strip of safety valve.

As Fig. 1; 2; the automatic close-type safety valves for gas has preceding valve casing 9; it is a disc-shaped bodies; the core of preceding valve casing has intake interface 11; it can link to each other with suction valve 10; the inboard of interface 11 has valve seat 12; valve seat is a cone shape hole; and communicate with the inboard of interface 11; the interface 8 of on the circumference of preceding valve casing, giving vent to anger; it can join with gas outlet valve 13 or directly join with kitchen range; on preceding valve casing 9, back valve casing 5 is housed with screw thread or other fixation method; form a cavity between it and the preceding valve casing 9; circumference is fixed a resilient diaphragm seal 6 between preceding valve casing and the back valve casing; it can be by rubber; plastics or metallic material are made; cavity and back cavity before diaphragm seal 6 is divided into cavity; the center of diaphragm seal 6 has the spool 14 that stretches out; it is sealed and matched mutually and the inboard channel of interface 11 can be shut with valve seat 12 on the preceding valve casing 9; the center portion of back valve casing 5 is porose; preferably be fixed with (as with fixation methods such as screw thread or screws) the porose bonnet 3 in center in the hole; in the hole that is loaded on the back valve casing that pull bar 2 is slidingly matched or in the hole of bonnet 3; one end of pull bar 2 stretches in the cavity of back and with the center of diaphragm seal 6 and links to each other; for example with screw thread or as Fig. 1; sphere shown in 3 cooperates and links to each other; the other end of pull bar 2 stretches out the back valve casing; preferably have a ring or a handle 1 on it; in the cavity of back, on the pull bar 2 elastic element 4 is housed also; elastic element 4 can be as shown in Figure 1 a helical spring; also can be several little springs of circle distribution; the elastic force of elastic element 4 acts on the diaphragm seal 6; the spool 14 of diaphragm seal 6 is pressed on the valve seat 12 and interface 11 paths are sealed; the banking stop 7 that preferably has a metal in the back cavity side of diaphragm seal 6; when diaphragm seal is rubber or plastics system; it can play a protective role; on the valve casing of back, also have at least three limited posts 15; it matches diaphragm seal is spacing with annular projection on banking stop 7 or the diaphragm seal 6; make the unlikely disengaging valve seat of spool far away excessively, also porose 16 make cavity communicate with atmosphere on the back valve casing.

This valve preferably is connected to before the flexible pipe of gas cooker, suction valve 10 is the switch valves in the general burning line, one termination source of the gas, another termination safety valve of the present utility model, connect flexible pipe behind the gas outlet valve 13, also available multiple-way valve, gas outlet valve 13 also can omit certainly, available threeway or four-way are to connect a plurality of utensils of using.

The elastic force of elastic element 4 should design by supply gas pressure, make it enough pressure and sealed valve 12, simultaneously the elastic force of elastic element 4 should be less than the product of the active area of air pressure and diaphragm seal 6 when gas just commonly used, also should be taken into account simultaneously when supply gas pressure cross when low (as with Qihu too much and pressure when descending), this moment, flame was too small, extinguish easily and cause danger, the power of elastic element 4 should be able to overcome air pressure on diaphragm seal active force and valve 13 cuts out.

Bleed pressure just often, at first open suction valve 10 in the time of will be with combustion gas, this moment is because valve seat 12 holes are less, gaseous-pressure also is not enough to promote elastic element moves spool, combustion gas can not enter preceding cavity, with pulling rotating ring 1, spool 14 is moved to left, combustion gas this moment enters preceding cavity through the hole of valve seat 12, gaseous-pressure acts on the whole area of diaphragm seal 6, therefore overcome the elastic force of elastic element 4 and made spool be in left position, can use combustion gas this moment through giving vent to anger interface 8, and the gaseous-pressure of cavity descends before suction valve 10 cuts out, spool 14 leans on the elastic force seat of elastic element 4 on valve seat 12, promptly closed source of the gas automatically, even valve 10 gas leakage can not make spool open yet.

When the source of the gas accident is stopped the supple of gas or steam; no matter whether follow-up valve and air intake valve 10 close; because of being in passive state in the preceding cavity; the elastic force of spring 4 is pushed spool to valve seat and the closed valve seat hole; even when coming gas again, can not make the spool face of moving to left open valve, have only the people to spur ring 1 o'clock; just can open, therefore play the safety protection effect.

When flexible pipe comes off, break or seriously during situation such as gas leakage, pressure before will make this moment in the cavity descends, the elastic force of spring 4 will make spool be sitting on the valve seat and valve will cut out, and gas leakage is serious, and pressure descends fast, the time of then closing is also fast, even the people spurs ring 1, preceding cavity still can not be set up certain pressure, so this valve will be closed automatically.

Therefore, automatic close-type safety valves for gas of the present utility model in the time of opening, must spur pull bar air feed again by the people again after closing combustion gas, die as abnormal conditions such as source of the gas, can play during situations such as hose fracture and close source of the gas automatically and play the security insurance effect.

Claims

1, a kind of automatic close-type safety valves for gas, has preceding valve casing (9), the back valve casing (5) that is connected with preceding valve casing (9), has cavity between preceding valve casing and the back valve casing, safety valve also has intake interface (11) and the interface of giving vent to anger (8), it is characterized in that also having valve seat (12) in the intake interface (11), between preceding valve casing (9) and the back valve casing elastic sealing strip (6) that described cavity is divided into preceding cavity and back cavity is housed, said intake interface (11) and the interface of giving vent to anger (8) communicate with preceding cavity, has the spool (14) that seals mutually with valve seat (12) on the diaphragm seal (6), also have with back valve casing (5) and be slidingly matched, one end stretches out the pull bar (2) that the back valve casing the other end links to each other with diaphragm seal (6) in the cavity of back, the elastic element (4) on diaphragm seal (6) of suppressing with in the cavity of said back has vent (16) on the back valve casing (5).

2, automatic close-type safety valves for gas as claimed in claim 1 is characterized in that said elastic element (4) is for being sleeved on the spring on the pull bar (2).

3, automatic close-type safety valves for gas as claimed in claim 1 is characterized in that said elastic element (4) is the spring of several circle distribution.

4, automatic close-type safety valves for gas as claimed in claim 1 is characterized in that said back cavity has a banking stop (7) that abuts against on the diaphragm seal (6).

5, automatic close-type safety valves for gas as claimed in claim 1 is characterized in that the external part of said pull bar (2) has draw ring or handle (1).

6, automatic close-type safety valves for gas as claimed in claim 1 is characterized in that said pull bar (2) and being connected of diaphragm seal (6) are screw thread or spherical the cooperation.

7, automatic close-type gas combustion safety valve as claimed in claim 1 is characterized in that having limited post (15) on the said back valve casing (5).

8, automatic close-type safety valves for gas as claimed in claim 1 is characterized in that back valve casing (5) upward has bonnet (3) with pull bar (2) place of matching.