CN2279609Y

CN2279609Y - Combustible gas leakage alarm controller with self-checking up function

Info

Publication number: CN2279609Y
Application number: CN 96224310
Authority: CN
Inventors: 何其纯; 何唯实
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-12-20
Filing date: 1996-12-20
Publication date: 1998-04-22
Anticipated expiration: 2006-12-20

Abstract

The utility model provides a combustible gas leakage alarm controller with self-checking up function, composed of a gas-sensitive sensor capable of sensing the variation of the concentration of combustible gas in the environment, a testing circuit, a comparator circuit, a light alarm circuit, a lamplight displayer, a gas safety valve and an exhaust fan. The utility model is characterized in that the utility model also comprises an alarm circuit which receives sound respectively from the comparison circuit, a control gas safety valve closing and locking circuit, and a self-checking circuit which checked the system itself whether the state of checking up the work is normal. The controller can automatically detect the leak of the combustible gas, send out sound and light alarm signals, cut off the air supply of the combustible gas, and open the exhaust fan to discharge gas. The utility model is a new generation product, which has the advantages of perfect function, fine selectivity and convenient operation.

Description

The combustible gas leakage alarm controller of band self-checking function

The utility model relates to family expenses combustible gas alarm control device, particularly a kind of combustible gas leakage alarm controller with self-checking function.

Piped gas, liquefied petroleum gas, rock gas generally become the optimal life fuel of town dweller.But in use, since use accidentally or equipment quality bad, as proofed sleeve break, come off, stove fire is put out in wind, soup overflows and puts stove fire out by water, switch gas leakage, forgets situation such as close, all can cause the leakage of inflammable gas, jeopardize major accidents such as people's life security and property.Therefore, an urgent demand development is a kind of can detect and produce the safety guard that controlling alarm is closed source of the gas to combustible gas leakage.The patent No. is 95218911.9 to disclose a kind of patented product of multi-functional combustible gas leakage alarm controller by name, mainly the automatic detection gas leak of forming by gas sensor, testing circuit, comparator circuit, language and optical alarm circuit, control circuit, AC power circuit, gas relief valve, vent fan etc., cut off gas source and open the alarm controller that vent fan turns round automatically automatically.This alarm controller has characteristics such as highly sensitive, that antijamming capability is strong, automaticity is high, usable range is wide.But this patent is improved part in addition inadequately on function, and native system is not had the self-checking circuit of self-checking function, and control circuit sends control signal and can not lock gas relief valve, and above-mentioned two kinds of functions are very important.

The purpose of this utility model provides a kind of situation of monitoring of environmental combustible gas leakage automatically, sound, visual alarm can have been sent automatically, and can cut off and lock source of the gas automatically, open vent fan automatically, and native system be had the combustible gas leakage alarm controller of self-checking function.

Technical solution of the present utility model is: this alarm controller comprises formations such as gas sensor that the induced environment combustable gas concentration changes, testing circuit, comparator circuit, optical alarm circuit, Lamplight displayer, gas relief valve, vent fan.This alarm controller also comprises and receives the sound alarm circuit that sends from comparator circuit respectively and the control gas relief valve is closed and the AC power circuit of lock-in circuit, the operation of control vent fan and whether normally system itself checked duty self-checking circuit.

Self-checking circuit of the present utility model is by testing button K switch 2, adjustable resistor W2 forms, testing button K switch 2 one termination adjustable resistor W2 one end wherein, the other end is connected to the output terminal of gas sensor MQ and the end of potentiometer W1, and the other end of adjustable resistor W2 is connected to the power end (12 volts of direct currents) of gas sensor MQ.

Control circuit of the present utility model and lock-in circuit, AC power circuit are made up of comparer IC3, controllable silicon SCR, bidirectional triode thyristor BCR, diode D1, D3, resistance R 1, R2, R7, capacitor C 4, reset switch K3.The negative terminal of comparer IC3 connects the negative terminal of IC2, the tie point of positive terminating diode D1, resistance R 7 and the capacitor C 4 of IC3, and the other end ground connection of capacitor C 4, the end of the other end of resistance R 7 and diode D1 also is attached to the output terminal of IC1.The output terminal of IC3 is connected to the control utmost point of controllable silicon SCR through diode D3, the anode of controllable silicon SCR is connected to an end of gas relief valve JF coil, the other end of JF coil is connected to the anode of 12 volts of direct supplys, the other end of controllable silicon SCR is connected to the end of reset switch K3, the other end ground connection of reset switch K3.The output terminal of IC3 is the end of connecting resistance R1 in addition, and the other end of R1 is connected to the end ground connection of an end and the bidirectional triode thyristor BCR of R2, and the other end is connected to the end of vent fan PS, and the other end of vent fan PS is connected to the live wire of 220 volts of AC power.

Sound alarm circuit of the present utility model is made up of comparer IC2, triode BG2, diode D2, resistance R 11, R19, R20, capacitor C 5, sounder Y.The end of the positive terminating diode D2 of comparer IC2 wherein, the tie point of resistance R 11 and capacitor C 5, the other end ground connection of capacitor C 5, the other end of resistance R 11 is in parallel with the end of diode D2, the negative terminal of comparer IC2 is connected with the negative terminal of IC3, the output terminal of IC2 is connected to an end of base stage and the resistance R 20 of triode BG2 through resistance R 19, the other end ground connection of R20, the collector of triode BG2 is connected to the anode of 12 volts of direct currents, the emitter of BG2 is connected to the anode of sounder Y, the negativing ending grounding of sounder Y.

The utility model compared with the prior art, have highly sensitive, antijamming capability is strong, robotization is higher, safe and reliable, self-checking function is arranged, can monitor out combustible gas leakage automatically, also send sound, visual alarm automatically, cut off (locking) inflammable gas source of the gas automatically, open the vent fan emission gases automatically.Be that a kind of function is very perfect, selectivity is good, combustible gas leakage alarm controller easy to operate.

Below in conjunction with accompanying drawing the utility model is illustrated:

Fig. 1 is a block diagram of the present utility model;

Fig. 2 is a circuit structure diagram of the present utility model;

Fig. 3 is a safety valve synoptic diagram of the present utility model.

As shown in Figure 1: this block diagram is made of jointly power circuit, gas sensor, self-checking circuit, testing circuit, comparator circuit, sound alarm circuit, sounder optical alarm circuit, Lamplight displayer, control circuit, lock-in circuit, gas relief valve, AC power circuit, vent fan, gas source, gas appliance etc.

As shown in Figure 2: principle of work of the present utility model is: in pure air, gas sensor MQ conductivity is low, potentiometer W1 and thermistor R15 two ends are low-voltage, comparer IC1 output terminal also is an electronegative potential, LED 1 positive pole obtains positive potential luminous (green), LED2 do not work (redness).Comparer IC2 output terminal also is an electronegative potential, not conducting of BG2, and sounder Y does not send pulsed sound.Comparer IC output terminal is an electronegative potential also, and controllable silicon SCR is triggering and conducting not, and gas relief valve is not worked, not conducting of bidirectional triode thyristor BCR, and vent fan PS does not work.

When having gas such as coal gas to leak when environment, the conductivity of gas sensor MQ increases, potentiometer W1 and thermistor R15 both end voltage increase, when reaching certain value, gas concentration (can select its sensitivity) by regulating W1, the IC1 output terminal is a noble potential, it is shinny that LED 2 positive poles obtain positive potential, and LED1 does not work.Comparer IC2 output terminal also is a noble potential, triode BG2 conducting, and the pulsed sound clear, loud, that rhythm is clearly demarcated is sent in sounder Y work.After making the IC1 output terminal be electronegative potential by R11, C5 delay circuit, it is noble potential that the IC2 output terminal should be kept half a minute, makes sounder Y continue a period of time of reporting to the police.The output terminal of comparer IC3 also is a noble potential, the controllable silicon SCR conducting, gas relief valve JF work, close the gas pipe source of the gas, and be in the lock state, have only and manually open reset switch K3, gas relief valve recovers original off position, the pipe source of the gas that turns on the gas-fire, bidirectional triode thyristor BCR conducting simultaneously, vent fan PS obtains 220 volts of power supply entry into service exhausts.After making the IC output terminal be electronegative potential by resistance R 7 capacitor C 4 delay circuits, the IC3 output terminal should keep that the time is noble potential more than 2 minutes, and vent fan PS is remained in operation exhaust a period of time.

Self-checking circuit is to check whether the duty of alarm controller own normal, has non-fault to take place, have only through checking, the non-fault of illustrative system own, duty just often, just relieved use of user.When pressing testing button K switch 2, potentiometer W1 and thermistor R15 both end voltage increase in the testing circuit, make its value of increasing be equal to the value that increases of gas sensor MQ induction finite concentration gas by regulating adjustable resistor W2, making the IC1 output terminal is noble potential, sound, optical alarm circuit work, send sound, visual alarm, control circuit work, gas source is closed in gas relief valve work, vent fan PS obtains 220 volts of power supplys, entry into service exhaust.

Usually in energising moment, because the characteristic of semiconductor of gas sensor MQ, violent variation can appear in its conductivity, after several minutes, and its conductivity is basicly stable, enters normal condition.This inherent characteristic of gas sensor, can make circuit send the false alarm signal one time in the moment of switching on as not taking measures, eliminating this false positive signal is to realize, make comparer IC1 to remain electronegative potential output in the gas sensor stabilization process by resistance R 4, capacitor C 3, comparer IC4 compensating circuit.

As shown in Figure 3: the gas relief valve JF that alarm controller adopted comprises valve body 1, seal membrane 2, and valve gap 3, coil assembly 4, lid 5, moving iron core 6, axle 7 is formed.During ventilation, seal membrane is upwards backed down, make coal gas flow to the gas outlet from air intake opening by air intake opening gas pipe internal pressure.When gas relief valve obtained voltage, coil assembly 4 had electric current to pass through, and formed magnetic field, and moving iron core 6 moves downward, makes seal membrane 2 to push down the connector of air intake opening and gas outlet under the action of a magnetic field, thereby closes source of the gas automatically.

The valve body of safety valve is to constitute with the aluminium foundry goods, and parts all are fixed in the main body of aluminium diecasting.Seal membrane is to make with the butyronitrile rubber material of anti-aging corrosion resistance gas, guarantees the serviceable life of gas relief valve.

The gas sensor MQ that the utility model is selected can only choose coal gas or liquefied petroleum gas (LPG) according to different use occasions, and rock gas is a kind of gas sensor of different model of gas sensitization wherein.

Claims

1, a kind of combustible gas leakage alarm controller with self-checking function, comprise formations such as gas sensor that the induced environment combustable gas concentration changes, testing circuit, comparator circuit, optical alarm circuit, Lamplight displayer, gas relief valve, vent fan, it is characterized in that: also comprise receiving the sound alarm circuit that sends from comparator circuit respectively; The control gas relief valve is closed and lock-in circuit, controls the alternating circuit of vent fan operation, and whether normally system itself is checked duty self-checking circuit

2, controller according to claim 1, it is characterized in that: said self-checking circuit is made up of testing button K switch 2 and adjustable resistor W2, testing button K switch 2 one termination adjustable resistor W2 one end, the other end is connected to the output terminal of gas sensor MQ and the end of potentiometer W1, and the other end of adjustable resistor W2 is connected to the power end of gas sensor MQ.

3, controller according to claim 1, it is characterized in that: said control circuit and lock-in circuit, AC power circuit is by comparer IC3, controllable silicon SCR, bidirectional triode thyristor BCR, diode D1, D3, resistance R 1, R2, R7, capacitor C 4, reset switch K3 forms, the negative terminal of comparer IC3 connects the negative terminal of IC2, the anode of IC3 is with an end that connects diode D1 and resistance R 7 and capacitor C 4, the other end ground connection of capacitor C 4, the end of the other end of resistance R 7 and diode D1 also is attached to the output terminal of IC1, the output terminal of IC3 is connected to the control utmost point of controllable silicon SCR through diode D3, the anode of controllable silicon SCR is connected to an end of gas relief valve JF coil, the other end of JF coil is connected to the anode of 12 volts of direct supplys, the negative electrode of controllable silicon SCR is connected to the end of reset switch K3, the other end ground connection of K switch 3, the output terminal of IC3 in addition connecting resistance R1 to the control utmost point of bidirectional triode thyristor BCR and an end of resistance R 2, the other end ground connection of R2, the anode of BCR is connected to the end of vent fan PS, another termination AC power of vent fan, the plus earth end of BCR.

4, controller according to claim 1, it is characterized in that: sound alarm circuit is by comparer IC2, triode BG2, diode D2, resistance R 11, R19, R20, capacitor C 5, sounder Y forms, the tie point of the end of the positive terminating diode D2 of comparer IC2 and resistance R 11 and capacitor C 5 wherein, the other end ground connection of capacitor C 5, the other end of resistance R 11 is in parallel with the end of diode D2, the negative terminal of comparer IC2 is connected with the negative terminal of IC3, the output of IC2 is connected to an end of base stage and the resistance R 20 of triode BG2 through resistance R 19, the other end ground connection of R20, the collector of BG2 connects 12-volt dc power supply, emitter is connected to the anode of sounder Y, the negativing ending grounding of sounder Y.