CN2237766Y

CN2237766Y - Relief safety valve for liquified gas cylinder

Info

Publication number: CN2237766Y
Application number: CN 95217578
Authority: CN
Inventors: 李广玉; 岳新生
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-21
Filing date: 1995-07-21
Publication date: 1996-10-16
Anticipated expiration: 2005-07-21

Abstract

The utility model relates to a pressure reducing security valve for liquid gas storage tank, which comprises a pressure reducing valve and a safety valve which is a solenoid valve controlled by an electronic circuit, a locating slot is arranged on a valve core, a lock-tongue that the action is controlled by the output of the electronic circuit, is vertically provided with the valve core, the valve core is controlled by the lock-tongue, when the liquefied gas leaks out, the lock-tongue can close the outlet of the liquid gas storage tank and send out audible and visual alarm signals simultaneously. The utility model achieves the goal of one valve with dual-purpose, reliably preventing the fire and fatal accidents.

Description

Liquefied gas tank decompression safety valve

The utility model is the liquefied gas tank decompression safety valve that a kind of gas leakage can be closed source of the gas automatically.

When coal gas or liquefied gas pipeline take place to be leaked, can cut off source of the gas automatically under the Wu Ren situation at the scene, prevent the generation of the person and property accident, people have invented all devices that automatically shuts down source of the gas that is used on the pipeline, but these devices are used on the liquefied gas tank, because its interface is too much, install complicated, and be difficult for promoting, and the generation liquid gas overflows before suction port, also can't close the total valve of liquefied gas tank.

The purpose of this utility model is, for overcoming the deficiency of prior art, and provides a kind of liquefied gas tank that is used for, the liquefied gas tank decompression safety valve that can reduce pressure and close automatically when working as gas leak.

Following mode can realize the utility model:

Form and comprise reduction valve and safety valve, safety valve is the solenoid valve by electronic circuit control, spool one end of solenoid valve has sealing gasket, the other end is equipped with pressure spring, have locating slot on the spool, dead bolt and spool Vertical direction are provided with, and electromagnet places the both sides up and down of dead bolt, and valve cage communicates with air outlet and decompression valve port during unlatching; Rectifier bridge D ₅～D ₈Output through relay J _1-1Normally closed point and capacitor C ₃Positive pole is connected, J _1-1The normal battle is connected with electromagnetic valve coil.

The utility model one valve is dual-purpose, when normally using coal gas, is reduction valve, when gas leak takes place, can close the liquefied gas tank valve automatically, can prevent the generation of fire and gas poisoning effectively.

Fig. 1 is the utility model structural representation;

Fig. 2 is the control circuit electrical schematic diagram.

Embodiment:

Valve body 1 and valve seat 2,13 are connected by flange plate, suction port is threaded with liquefied gas tank, the pressure adjusting spring 5 of reduction valve is adjusted the gas pressure of suction port by connecting rod 3, air outlet 14 is connected with stove and accessory, spool one end of solenoid valve has sealing gasket 6, the other end is equipped with pressure spring 8, have locating slot on the spool 7, dead bolt 11 and spool 7 Vertical direction settings, electromagnet 12 places the both sides up and down of dead bolt 11, and spool 7 is fixed on desired location by dead bolt 11 when normally opening, and valve cage 9 communicates with air outlet 14 and decompression valve port 15, liquid gas reduces pressure through valve port 15 from suction port 16, valve cage 9 flow to stove and accessory from the air outlet; Power supply 220V is through transformer B step-down, rectifier bridge D ₁～D ₄, D ₅～D ₈Rectification, capacitor C ₁～C ₃Filtering produces two groups of voltages, one group of output 6V VDC after 7806 voltage stabilizer voltage stabilizings, and for control circuit work, another organizes D ₅～D ₈Output through relay J _HNormally closed point and capacitor C ₃Positive pole is connected, at C ₃On charge to+44V, as the standby power supply of closing solenoid valve, J _1-1The normal battle is connected with line solenoid valve, and in the present embodiment, electronic sensor is gas sensitive element GM, the output of CM and voltage comparator ic ₁In-phase input end be connected IC ₁Output terminal and phase inverter Q ₁Base stage link to each other Q ₁Collector electrode be connected to voltage comparator ic ₂Inverting input, IC ₂Output connect two current amplifier IC ₃With IC ₄In-phase input end, IC ₃Output drive buzzer, IC ₄Output drive relay J ₁Coil, LED ₁Be the power supply indication, LED ₂Be alarm indication, switched on initial 3～5 minutes that gas sensitive element GM has an electricity to lead the increase process, the each point potential change is as follows in this process: a＞b among Fig. 2, the c point is a high petential, Q ₁Conducting, the d point is 3V, capacitor C ₄Enter charged state, at this moment d) e, the f point is a low potential, LED ₂Not luminous, g point low potential, buzzer do not ring, h point low potential, relay J ₁The contact be failure to actuate, when GM enters normal state when being high resistant, the each point potential change is as follows: a (b, c point low potential, Q ₁End, d point 6V, the C4 end of charging, e point current potential 3.5V, the f point, g point, h point each point still are low potential, and circuit enters treats state of alarm, and when the liquid gas that leaks in the air reached finite concentration, the GM electricity was led to increase to and is made a point current potential be higher than the b point, c point high petential, Q ₁Conducting, the d point is 3V, i.e. e＞d, this moment, the f point was a high petential, LED ₂Bright, g point high petential, buzzer rings, h point high petential, relay J ₁Normal adhesive battle, capacitor C ₃Electromagnetic valve coil is discharged, electromagnet 12 is inhaled moving dead bolt 11, dead bolt 11 withdrawals, spool 7 drives sealing gasket 6 under the effect of pressure spring 18, the valve port 15 that will reduce pressure is obturaged, cut off the liquefaction source of the gas, after having got rid of disappointing fault, manually opened spool 7 again, sealing gasket 6 breaks away from decompression valve port 15, and suction port 16 communicates with air outlet 14.

Claims

1, a kind of liquefied gas tank decompression safety valve is formed and is comprised reduction valve and safety valve, it is characterized in that:

A. safety valve is the solenoid valve by electronic circuit control, spool one end of solenoid valve has sealing gasket, the other end is equipped with pressure spring, have locating slot on the spool, dead bolt and spool Vertical direction are provided with, electromagnet places the both sides up and down of dead bolt, and valve cage communicates with air outlet and decompression valve port during unlatching;

B. rectifier bridge D ₅～D ₈Output through relay J _1-1Normally closed point and capacitor C ₃Positive pole is connected, J _1-1The normal battle is connected with electromagnetic valve coil.

2, valve according to claim 1 is characterized in that: the electronic sensor in the described electronic control circuit is a signal input part, the output of sensor and voltage comparator ic ₁Input be connected IC ₁Output and phase inverter Q ₁Input be connected Q ₁Output and voltage comparator ic ₂Input be connected IC ₂Output drive two current amplifier IC ₃, IC ₄