CN2197525Y

CN2197525Y - Automatic shut-off valve for gas supply

Info

Publication number: CN2197525Y
Application number: CN 94215941
Authority: CN
Inventors: 岳新生; 李广玉
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-06-23
Filing date: 1994-06-23
Publication date: 1995-05-17
Anticipated expiration: 2004-06-23

Abstract

The utility model discloses an automatic shut-off valve for gas supply, comprising a control circuit and an electromagnetic self-locking valve, wherein, the electromagnetic self-locking valve is composed of a valve body, a valve seat, a valve core, an electromagnet, and a self-locking mechanism, and the control circuit is composed of a power supply circuit and an alarm circuit. The utility model still can realize the alarm function, the gas source cutting-off function, and the self-locking function, under the main failure condition because of the design of the power supply circuit. The utility model can be arranged on various inflammable gas pipelines, and the use is safe.

Description

Automatic shut-off valve for gas supply

The utility model relates to a kind of locking device, is the automatic closing-locking device of a kind of gas leakage.

In order to make coal gas, to turn-off source of the gas rapidly under nobody situation at the scene when liquefied gas pipeline takes place to leak, people have invented the safety valve that automatically shuts down source of the gas and self-locking, as notification number is CN2112041U, name is called the utility model patent of " self-locking coal gas, liquid gas safety valve ", when can realizing coal gas, gas leak, it turn-offs source of the gas and self-locking, but this safety valve complex structure, processing and installation are all inconvenient.

The purpose of this utility model is, for overcoming the deficiency of prior art, provides a kind of gas leakage simple in structure from closing the locking device.

The utility model can be realized with following mode:

Locking device comprises control circuit and electromagnetic self-locking valve, control circuit comprises power circuit and warning circuit, the sensor output terminal of warning circuit links to each other with the voltage comparator input end, the output terminal of voltage comparator connects AND NOT gate, the input end of phase inverter connects the AND NOT gate output terminal, inverter output links to each other relay J with the base stage of triode ₂Coil is connected on collector loop; The electromagnetic self-locking valve comprises valve body, valve seat, spool, electromagnet and self-locking mechanism.

In the power circuit through step-down, D ₁, D ₂The full-wave rectifying circuit of forming, the 9V power supply after the voltage stabilizing are through R ₁₁, D ₃Give battery E charging, battery E anode is through relay J ₁, normally closed some J _1-3Go into end with DC power convertor and link to each other DC power convertor output terminal and electromagnetic valve coil and capacitor C ₆Anodal linking to each other, when civil power was arranged, the VDC at capacitor C two ends was by rectifier bridge Q ₁Output terminal is supplied with.

The electromagnetic self-locking valve that comprises valve body, valve seat, spool, electromagnet and the mechanism of hiding certainly, spool is in valve body, its upper end connects valve rod, is with spring on the valve rod and withstands between spool and the valve interior wall, and positioning groove is arranged on the spool, self-locking mechanism is made up of electromagnet, dead bolt, spring, spring places between dead bolt and the bottom, and when spool was opened, dead bolt was stuck on the spool positioning groove from the side, spool is gone to the bottom sealing gasket is housed, and the inlet, outlet pipeline all communicates with the cavity of valve body lower portion.

Good effect of the present utility model:

When taking place, gas leakage can cut off and pin the gas inlet valve automatically, send the acoustooptic alarm signal simultaneously, reminds people is in time checked circuit failure, control circuit is also opened air bells exhauster simultaneously, on-the-spot leakage gas is taken away, and the utility model is battery-powered when having a power failure still can realize closing the valve auto-lock function, and filter of this device and magnetizer can leach the impurity in the coal gas, it is fully burnt, improve the thermal efficiency.

Fig. 1 is the utility model electromagnetic self-locking valve most preferred embodiment structural representation;

Fig. 2 adopts corrugated gasket structure schematic representation;

Fig. 3 is the control circuit electrical schematic diagram;

Fig. 4 is the power circuit electrical schematic diagram.

Below in conjunction with accompanying drawing in detail the utility model most preferred embodiment is described in detail:

Control circuit is made up of power circuit and warning circuit, and sensor is selected gas sensitive tube in the present embodiment for use, and IC1a is a voltage comparator, gas sensitive tube GM and RW ₂, R ₃Dividing potential drop, dividing point is through R ₆Link to each other with 13 pin of IC1a, IC1b is a delayer, and IC1c also is a delayer, IC2a right and wrong gate circuit, and IC2b and IC2c are phase inverters, work as capacitor C ₁Pass through R ₁Charge approaching+during 5V, the IC1b7 pin is that the IC2a13 pin is a high level, LED ₃Be the time-delay indication, it is about more than 3 minutes to delay time, and prevents that gas sensitive tube GM from switching on for the first time, and the electricity in the heated filament heating process is led and reduced, and produce mistake and close valve events, after time-delay 3 minutes, 7 pin of IC1b, IC2a ₁₃Pin all is a high level, waits for state of alarm, at this moment LED ₃Bright, gas sensitive tube GM electricity is led and is recovered normal, and 14 pin of IC1a are in low level, and the IC1c8 pin also is a low level, and 6 pin of inverter ic 2b are high level, and in like manner 8 pin of inverter ic 2c are low level, triode T ₁End, when gas leakage took place, 14 pin of IC1a, 1 pin of IC2a were high level simultaneously, and this moment, 13 pin, 2 pin of IC2a also were high level, and 9,10,11 pin of 12 pin of IC2a and IC2c are low level simultaneously, and the IC2c8 pin is a high level, amplifying tube T ₁Conducting, solid state relay J ₂Adhesive, the J of often making war _2-1Adhesive, electromagnetic coil 1 energising, electromagnet 6 makes dead bolt 7 actions, closes spool, cuts off source of the gas, and more than action takes place to continue approximately below 0.1 second, after 0.1 second, C ₂Pass through R ₂Charging, the IC1C10 pin is a high level, and 8 pin are also high, and the IC2b6 pin is a low level, and 12 pin of IC2a are high level, the IC2C8 pin is a low level, T ₁End relay contact J ₂-1 disconnects, and no longer gives electromagnetic coil 1 energising, but buttoned-up spool 3 can not open again, and after principal fault was got rid of, by manual unlocking spool 3, as long as gas leakage is arranged, 14 pin of IC1a were still kept high level, transistor T ₂, T ₃Conducting, buzzer 4 sends alarm signal, LED ₄Light warning, relay J ₃Contacting, lampblack exhauster 3 are connected with the mains until leakage gas is drained, and the IC1a14 pin recovers low level, C then ₂Through R ₂Discharge, IC1C10 pin, 8 pin low levels, IC2b6 pin high level is waited for next time and being reported to the police.

Power circuit 220V power supply is after step-down, full wave rectifier, at capacitor C ₃Anode has+12V voltage, relay contact J _1-1Adhesive goes out+9V voltage through 7809 voltage stabilizings, and 7805 output terminals get+5V voltage, at this moment J _1-2Normal adhesive battle, J _1-3Normally closed point disconnects, LED ₁Bright, illustrate that power supply unit is normal ,+9V power supply passes through R ₁₁, D ₃Give battery E charging with little electric current, D ₄Negative terminal is a high petential, and battery E can not discharge, and DC power convertor 2 is not worked yet, and is connected on the rectifier bridge Q of transformer secondary output ₁Export to capacitor C ₆Charging, generation+30V voltage, when mains failure, J _1-2The normal battle broken J _1-3Normally closed point closes LED ₂Bright, explanation is a powered battery, at this moment, and J _1-3Make contact, DC power convertor 2 are by battery E powered operation, to replenish capacitor C ₆The pressure drop that self discharge produces keeps C ₆Two ends still are+30V voltage.If this moment gas leakage, but warning circuit proper functioning still, the electromagnetic self-locking valve normally cuts out, locks.

Electromagnetic self-locking valve embodiment:

As shown in Figure 1, valve body 2 is threaded with valve seat 1, spool 3 moves up and down in valve body 2, spool 3 upper ends connect valve rod 5, be with spring 4 on the valve rod 5, spring 4 withstands between spool 3 and valve body 5 inwalls, positioning groove 16 is arranged on the spool 3, the inner chamber of the electromagnet 6 of self-locking mechanism is provided with dead bolt 7, spring 4 withstands between dead bolt 7 and the bottom 9, pulling valve rod 5, make on the spool 3 and carry, dead bolt 7 hole from the side stretches in the valve body 2, is stuck on the positioning groove 15, and seal ring 10 is arranged on the spool 3, make the inner Seal cage that forms in the valve body 2, advance,

outlet pipe

15,14 all communicate with Seal cage, and this is the normal opening state of electromagnetic self-locking valve, works as gas leakage, control circuit work, during electromagnetic coil 1 energising, electromagnet 6 moves right dead bolt 7 pressure springs 8, and dead bolt 7 breaks away from groove 16, spool 3 falls, the sealing gasket 11 of spool 3 bottoms drops on admission line 15 mouths of pipe, cuts off the air inlet source, and self-locking, after getting rid of the pipeline principal fault, need manually to open spool 3 again and can connect source of the gas, admission line also is equipped with magnetizer 14 and filter 13 to leach the impurity in the coal gas, improves combustion efficiency.

Sealing gasket 10 is O RunddichtringO or corrugated, and Fig. 2 is the structural representation that adopts corrugated sealing gasket.

Claims

1, a kind of gas leakage comprises control circuit and electromagnetic self-locking valve from closing the locking device, it is characterized in that:

The a control circuit comprises power circuit and warning circuit, the sensor output terminal of warning circuit links to each other with the voltage comparator input end, and the output terminal of voltage comparator connects AND NOT gate, and the input end of phase inverter connects the AND NOT gate output terminal, inverter output links to each other relay J with the base stage of triode ₂Coil is connected on collector loop;

B electromagnetic self-locking valve comprises valve body, valve seat, spool, electromagnet and self-locking mechanism.

2, locking device according to claim 1 is characterized in that: in the power circuit through step-down, D ₁, D ₂The full-wave rectifying circuit of forming, the 9V power supply after the voltage stabilizing are through R ₁₁, D ₃Give battery E charging, battery E anode is through relay J ₁, normally closed some J _1-3Go into end with DC power convertor and link to each other DC power convertor output terminal and electromagnetic valve coil and capacitor C ₆Anodal linking to each other, when civil power was arranged, the VDC at capacitor C two ends was by rectifier bridge Q ₁Output terminal is supplied with.

3, locking device according to claim 1, it is characterized in that: the electromagnetic self-locking valve that comprises valve body, valve seat, spool, electromagnet and self-locking mechanism, spool is in valve body, its upper end connects valve rod, being with spring on the valve rod withstands between spool and the valve interior wall, positioning groove is arranged on the spool, self-locking mechanism is made up of electromagnet, dead bolt, spring, spring places between dead bolt and the bottom, when spool is opened, dead bolt is stuck on the spool positioning groove from the side, and spool is gone to the bottom sealing gasket is housed, and the inlet, outlet pipeline all communicates with the cavity of valve body lower portion.

4, locking device according to claim 3 is characterized in that: sealing gasket is an O RunddichtringO or corrugated.