CN2769885Y

CN2769885Y - Gas leakage alarm closing device

Info

Publication number: CN2769885Y
Application number: CN 200520100572
Authority: CN
Inventors: 邱柏康
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-02-07
Filing date: 2005-02-07
Publication date: 2006-04-05
Anticipated expiration: 2015-02-07

Abstract

The utility model discloses a gas leakage alarming and closing device of which the host machine box can be provided with a gas valve electric opening and closing device and an outer detector. An internal circuit comprises a single chip computer which can be pre-written with a control program, and the pin end of the single chip microcomputer is correspondingly connected with a reset circuit, an oscillating circuit, a sound alarm circuit, a gas valve electrical opening and closing control circuit, a self-detecting alarm indicating circuit, a built-in alarm circuit, an alarming sensibility control circuit and an outer alarm circuit. The internal circuit is matched with the pre-written control program and has the functions of system detection and host machine self-check and fault alarm, and the alarming sensitivity control circuit comprises an integrating capacitor and a reference resistor used for arranging gas concentration on alarm points. The built-in alarm circuit and the outer alarm circuit can detect the faults of a built-in detector and the outer detector through respective comparators of the built-in and the outer alarm circuits. The utility model can have the functions of gas leakage alarm and double insurance and also has and functions of self-fault detection and alarm and intelligent control, so the utility model can immediately automatically fault detect the damage situation of devices.

Description

Gas leakage alarm closer

Technical field

The utility model relates to gas alarm stopping device, particularly gas leakage alarm closer.

Background technology

Combustion gas tool with fuel gas bottle or gas pipeline air feed, flexible pipe is aging to break and the kitchen range fault because connect, and usually for causing the leakage of combustion gas, combustion gas is inflammable and explosive and can cause people's poisoning, close in case leak as in time do not realized, often for leading to the serious great misfortune of the injury person and demolition of property.With regard to existing market, though existing multiple gas leakage safety shutoff is all different with the present invention; As the applying date is that the Chinese utility model patent ZL01229599.X (notification number is CN2492743Y) of 07 month 04 day calendar year 2001 discloses " cylinder for liquefied gas leak gas automatic alarm closuer ", it is to be directly installed on the shell of cylinder for liquefied gas valve body, and clutch end links to each other with handwheel on the cylinder for liquefied gas; And because existing liquefied gas bottle valve is the screw stop valve, the opening and closing valve is to realize by rotary screw, so be difficult to match with power motor as controlled valve, not that motor torsion is crossed the damage of senior general's valve, be exactly valve has been closed and motor is still burnt in work.

As the applying date is that the Chinese utility model patent ZL99250605.0 (notification number is CN2492743Y) on Dec 13rd, 2000 discloses " a kind of gas alarm shearing device " and than above-mentioned patent bigger improvement arranged, it comprises impulse electromagnetic valve, the surface of this device case is provided with the pilot lamp that can show several different gas concentrations, the circuit of this device is by testing circuit B, single-chip microcomputer C, panel shows and on-off circuit H, news are rung circuit E, driving circuit for electromagnetic valve F, remote signal driving circuit D forms, although this device can send the chimes of doom of different frequency, with the different gas concentration of acousto-optic indication, can remote control opening and closing solenoid valve, but also exist one to be that the combustion gas detector is single, use location to the combustion gas tool is restricted, and can't accomplish the effect of gas leakage alarm double insurance, when the combustion gas detector damaged, device promptly can't operate as normal; The 2nd, do not have the Based Intelligent Control effect that self-fault detect is reported to the police.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of two cover combustion gas detectors that have at above-mentioned prior art deficiency, has the gas leakage alarm closer of self-fault detect warning Based Intelligent Control effect.It can install to respectively on the easy position of leaking of combustion gas, plays the effect of gas leakage alarm double insurance, and the instant damaged condition of testing fixture voluntarily.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: gas leakage alarm closer, comprise host box, and be shaped on the built-in detector pore on this host box panel, and power connection, the pilot lamp that is connected on the described internal circuit is housed; Be provided with the internal circuit that contains power circuit that is fitted on the host line plate in host box, described power circuit includes current rectifying and wave filtering circuit and mu balanced circuit, and the technical measures of taking comprise:

A. described host box can be equipped with electronic opening/closing device of gas valve and external detector;

B. described internal circuit comprises the single-chip microcomputer that can write control program in advance, the leads ends correspondence that this single-chip microcomputer has is connected to reset circuit and oscillatory circuit, the leads ends that this single-chip microcomputer has also respectively correspondence be connected to described mu balanced circuit, audible alarm circuit, the electronic keying control circuit of gas valve, self-detection alarm indicating circuit contains the built-in warning circuit of built-in detector, the warning sensitivity control circuit, external warning circuit; This internal circuit cooperates the control program that writes in advance to have system's detection and the effect of main frame self check fault alarm; This warning sensitivity control circuit contains integrating condenser and is used to be provided with the reference resistance of alarm set point gas concentration, and the output resistance in this reference resistance and the built-in warning circuit, external warning circuit output resistance can replace respectively integrating condenser is charged;

C. described current rectifying and wave filtering circuit output voltage is VH, inserts the electronic keying control circuit of described audible alarm circuit and gas valve respectively; Described mu balanced circuit output voltage is VCC, inserts described built-in warning circuit, external warning circuit respectively, and inserts described single-chip microcomputer through reset circuit.

For optimizing technique scheme, the measure of being taked also comprises:

Above-mentioned single-chip microcomputer has reduced instruction, and the single-word instruction collection is with respect to multibyte sophisticated vocabulary effect; This single-chip microcomputer leads ends is respectively: external detector output resistance measuring junction RA0; Built-in detector output resistance measuring junction RA1; The discharge end RA2 of integrating capacitor C11; Warning sensitivity reference resistance measuring junction RA3; External breakdown detector indication output end RB0; Built-in detector oneself detection failure indication output end RB2; The electronic opening/closing device of gas valve control output end RB3; External detector detection signal input end RB4; Built-in detector lamp detection signal input end RB5; Gas leakage alarm indication output end RB6; Audible alarm output terminal RB7.

For scope that the utility model is implemented is wide,

A. above-mentioned audible alarm circuit is made up of resistance R 15, triode Q1, hummer SP, the SPK termination of resistance R 15 is gone into above-mentioned single-chip microcomputer pin RB7 end, the other end of resistance R 15 inserts the base stage of triode Q1, triode Q1 grounded emitter, triode Q1 collector series connection hummer SP inserts described output voltage V H;

B. above-mentioned self-detection alarm indicating circuit is made up of the light emitting diode L2 and the light emitting diode L3 of resistance R 12, resistance R 21, described pilot lamp; The ALED1 termination of resistance R 12 is gone into above-mentioned single-chip microcomputer pin RB6 end, and the other end of resistance R 12 is through light emitting diode L2 ground connection; The ALED2 termination of resistance R 21 is gone into above-mentioned single-chip microcomputer pin RB2 end, and the other end of resistance R 21 is through light emitting diode L3 ground connection;

C. the electronic keying control circuit of above-mentioned gas valve is made up of relay R LY1, diode D2, triode Q2, resistance R 16, the relay R LY1 that is in parallel with diode D2 is used to control the electronic opening/closing device keying of gas valve, the one termination is gone into above-mentioned output voltage V H, its other end connects triode Q2 collector, triode Q2 grounded emitter, triode Q2 base stage inserts above-mentioned single-chip microcomputer pin RB3 end through resistance R 16;

D. above-mentioned built-in warning circuit is by built-in detector U4, comparer UIB, resistance R 5, R8, R10, R14, capacitor C11, C12 form, comparer UI output DET1 termination is gone into above-mentioned single-chip microcomputer pin RB5 end, and and positive input between cross-over connection resistance R 10; Comparer UIB positive input connects capacitor C12, resistance R 14 ground connection parallel with one another through resistance R 8 one tunnel, and another road connects built-in detector U4; The single-chip microcomputer pin RA1 end that the A termination of built-in detector U4 is above-mentioned, the warning sensitivity control circuit that the B termination of built-in detector U4 is above-mentioned.

For the reference resistance of alarm set point gas concentration is set better, can realize reliable warning by the concentration adjustment reference resistance of judging combustion gas; Above-mentioned warning sensitivity control circuit comprises the resistance R 17 that is in series, above-mentioned reference resistance VR1, and its AN2 termination is gone into described single-chip microcomputer pin RA3 end; Its ACOM end DISCH termination of resistance R 5 in described built-in warning circuit is gone into above-mentioned single-chip microcomputer pin RA2 end, and reference resistance VR1 resistance is adjusted the may command warning sensitivity, and its ACOM end is also through capacitor C11 ground connection.

For optimizing external combustion gas detector better, make it to have same performance with built-in combustion gas detector, power supply in the above-mentioned external warning circuit, failure indicating circuit are by comparer UIA, resistance R 4, R7, R9, R11, capacitor C13, C14, diode D1 forms, comparer UIA output DET0 termination is gone into above-mentioned single-chip microcomputer pin RB0 end, and and positive input between cross-over connection resistance R 11, comparer UIA negative sense input VREF end also connects capacitor C14, diode D1 ground connection, and also meet above-mentioned filtering circuit output voltage V CC through resistance R 7; Comparer UIA positive input connects capacitor C13, resistance R 4 ground connection parallel with one another through resistance R 9, and connects the S terminal socket of the external detector that is used to peg graft.

For guaranteeing more reliably working of single-chip microcomputer, above-mentioned reset circuit is composed in series by the capacitor C8 of resistance R 13 and ground connection, and this resistance R 13 inserts above-mentioned single-chip microcomputer pin MCLR end with capacitor C8 contact; Above-mentioned oscillatory circuit comprises crystal oscillator CRY, and this crystal oscillator CRY two ends are connected with capacitor C9, the capacitor C10 of ground connection respectively, and this crystal oscillator CRY two ends also are connected to above-mentioned single-chip microcomputer pin OSC1 end and pin OSC2 end respectively.

Above-mentioned external detector comprises being provided with to be fitted in to pay pays the machine internal circuit on the machine circuit plate, this pair machine internal circuit is by external detector U5, resistance R 18, R19, R20, the light emitting diode L4 that is used for the power supply indication forms with the light emitting diode L5 that is used for indicating fault; The resistance R 19 of wherein, connecting with light emitting diode L5 inserts above-mentioned single-chip microcomputer pin RB0 end; The A end of above-mentioned external detector U5 connects above-mentioned single-chip microcomputer pin RA0 end, and also through resistance R 20 ground connection; The warning sensitivity control circuit ACOM end that the B termination of this external detector U5 is above-mentioned; 1 end of this external detector U5 connects above-mentioned filtering circuit output voltage V CC, and through resistance R 18, light emitting diode L4 ground connection.

For ease of the power supply indication, above-mentioned single-chip microcomputer pin TOCK1 end is gone into through above-mentioned mu balanced circuit GND termination, and the light emitting diode L1 of the described pilot lamp through being in series, resistance R 1 connect the Vin end of stabilivolt GND.

For ease of indication and observation and judgement, above-mentioned pilot lamp is light emitting diode L1, L2, L3, light emitting diode L1 selects for use green LED as power light, light emitting diode L2 selects for use red LED as the leakage alarm pilot lamp, and light emitting diode L3 selects for use yellow led as the fault alarm pilot lamp.

For further optimizing effect, above-mentioned single-chip microcomputer adopts PIC16C56 and compatible chip; Above-mentioned current rectifying and wave filtering circuit output voltage is that VH is direct current 12V, and above-mentioned mu balanced circuit output voltage is that VCC is direct current 5V.

Compared with prior art, host box of the present utility model can be equipped with electronic opening/closing device of gas valve and external detector; Internal circuit comprises the single-chip microcomputer that can write control program in advance, the leads ends correspondence that this single-chip microcomputer has is connected to reset circuit, oscillatory circuit, mu balanced circuit, audible alarm circuit, the electronic keying control circuit of gas valve, oneself's detection alarm indicating circuit, the built-in warning circuit that contains built-in detector, warning sensitivity control circuit, external warning circuit; This internal circuit cooperates the control program that writes in advance to have system's detection and the effect of main frame self check fault alarm; This warning sensitivity control circuit contains integrating condenser and is used to be provided with the reference resistance of alarm set point gas concentration; Built-in warning circuit, external warning circuit have the fault that detects built-in detector and external detector by comparer separately; The current rectifying and wave filtering circuit output voltage is VH, inserts the electronic keying control circuit of audible alarm circuit and gas valve respectively; The mu balanced circuit output voltage is VCC, inserts built-in warning circuit, external warning circuit respectively, and inserts single-chip microcomputer through reset circuit.By two cover combustion gas detectors, one is sleeved in the host box, another set ofly is connected with host box with the S clamped nipple by signal line, and it can install to respectively on the position of the easy leakage of combustion gas, plays the effect of gas leakage alarm double insurance; And has the effect of self-fault detect warning Based Intelligent Control, the instant damaged condition of testing fixture voluntarily.When wherein a cover damaged, yellow indicating fault lantern festival was not stopped glittering, and this moment, the utility model still was in intact duty, because another set of still operate as normal; If two covers damage simultaneously, promptly lose measuring ability to gas leakage, the utility model is then ceaselessly reported to the police with very brief buzzer and glittering red light, makes the utility model be in normal intact duty side up to fixing a breakdown and stops to report to the police.

Description of drawings

Fig. 1 is the utility model circuit theory block diagram;

Fig. 2 is the circuit theory conspectus among Fig. 1;

Fig. 3 is the utility model host box synoptic diagram.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

Fig. 1 to Fig. 3 illustrates, and gas leakage alarm closer comprises host box, is made up of the bonnet 1 of host box panel 9 and setting-in.Be shaped on built-in detector pore 5 on this host box panel 9, and power connection 4, the

pilot lamp

6,7,8 that is connected on the internal circuit is housed; In host box, be provided with the internal circuit that contains power circuit A that is fitted on the host line plate, power circuit A includes current rectifying and wave filtering circuit A1 and mu balanced circuit A2, indicate for ease of power supply, above-mentioned single-chip microcomputer pin TOCK1 end is gone into through mu balanced circuit GND termination, and the light emitting diode L1 of the pilot lamp through being in series, resistance R 1 connect the Vin end of stabilivolt GND; Host box interface 2 can be equipped with the electronic opening/closing device of gas valve, and host box interface 3 can be equipped with external detector; See Fig. 2, shown in Figure 3.

Internal circuit comprises the single-chip microcomputer that can write control program in advance, the leads ends correspondence that this single-chip microcomputer has is connected to reset circuit B1 and oscillatory circuit B2, the leads ends that this single-chip microcomputer has also respectively correspondence be connected to mu balanced circuit A2, audible alarm circuit D, the electronic keying control circuit of the gas valve of may command gas valve C, self-detection alarm indicating circuit E contains the built-in warning circuit H of built-in detector, warning sensitivity control circuit I can connect the external warning circuit of external detector F;

Single-chip microcomputer has reduced instruction, and the single-word instruction collection is with respect to multibyte sophisticated vocabulary effect; This single-chip microcomputer leads ends is respectively: external detector F output resistance measuring junction RA0; Built-in detector output resistance measuring junction RA1; The discharge end RA2 of integrating capacitor C11; Warning sensitivity reference resistance measuring junction RA3; External breakdown detector indication output end RB0; Built-in detector oneself detection failure indication output end RB2; The electronic opening/closing device of gas valve control output end RB3; External detector detection signal input end RB4; Built-in detector lamp detection signal input end RB5; Gas leakage alarm indication output end RB6; Audible alarm output terminal RB7; For guaranteeing more reliably working of single-chip microcomputer, reset circuit is composed in series by the capacitor C8 of resistance R 13 and ground connection, and this resistance R 13 inserts single-chip microcomputer pin MCLR end with capacitor C8 contact; Oscillatory circuit comprises crystal oscillator CRY, and this crystal oscillator CRY two ends are connected with capacitor C9, the capacitor C10 of ground connection respectively, and this crystal oscillator CRY two ends also are connected to single-chip microcomputer pin OSC1 end and pin OSC2 end respectively.Single-chip microcomputer adopts PIC16C56 and compatible chip; Current rectifying and wave filtering circuit A1 output voltage is that VH is direct current 12V, and mu balanced circuit A2 output voltage is that VCC is direct current 5V; See Fig. 1, shown in Figure 2.

Power circuit A is through becoming the three-way power of T1 transformation, rectification circuit B1 rectification, filter capacitor C1, C4 filtering, mu balanced circuit U2 voltage stabilizing generation circuit working with tapped transformer.One the tunnel is the interchange 12V power supply of the electronic opening/closing device of gas valve for the work of 12V alternating current generator; Exchange the rectification circuit B1 rectification generation VH of 12V voltage in current rectifying and wave filtering circuit A1 and supply the relay R LY1 among the electronic keying control circuit of the gas valve C, the hummer SP work among the audible alarm circuit D for the 12V direct supply; Obtain the power supply of about 6V from the centre tap of transformer, the VCC that is established as the control circuit power supply through rectification circuit B1 rectification, C1 filtering, the voltage stabilizing of U2 stabilivolt is the power supply of 5V work again.

This internal circuit cooperates the control program that writes in advance to have system's detection and the effect of main frame self check fault alarm; This warning sensitivity control circuit contains integrating condenser and is used to be provided with the reference resistance of alarm set point gas concentration, output resistance in this reference resistance and the built-in warning circuit, external warning circuit output resistance, can replace respectively integrating condenser is charged, the duration of charging that records is converted into the measured resistance value, directly judges the concentration of combustion gas by the big I of resistance value; Built-in warning circuit, external warning circuit have the fault that detects built-in detector and external detector by comparer separately;

Current rectifying and wave filtering circuit A1 output voltage is VH, inserts the electronic keying control circuit of audible alarm circuit D and gas valve C respectively; Mu balanced circuit A2 output voltage is VCC, inserts built-in warning circuit H, external warning circuit respectively, and inserts single-chip microcomputer through reset circuit B1.

Audible alarm circuit D is made up of resistance R 15, triode Q1, hummer SP, the SPK termination of resistance R 15 is gone into single-chip microcomputer pin RB7 end, and the other end of resistance R 15 inserts the base stage of triode Q1, triode Q1 grounded emitter, triode Q1 collector series connection hummer SP inserts output voltage V H;

Oneself's detection alarm indicating circuit E is made up of the light emitting diode L2 and the light emitting diode L3 of resistance R 12, resistance R 21, pilot lamp; The ALED1 termination of resistance R 12 is gone into single-chip microcomputer pin RB6 end, and the other end of resistance R 12 is through light emitting diode L2 ground connection; The ALED2 termination of resistance R 21 is gone into single-chip microcomputer pin RB2 end, and the other end of resistance R 21 is through light emitting diode L3 ground connection;

The electronic keying control circuit of gas valve C is made up of relay R LY1, diode D2, triode Q2, resistance R 16, the relay R LY1 that is in parallel with diode D2 is used to control the electronic opening/closing device keying of gas valve, the one termination is gone into output voltage V H, its other end connects triode Q2 collector, triode Q2 grounded emitter, triode Q2 base stage inserts single-chip microcomputer pin RB3 end through resistance R 16;

Built-in warning circuit H is by built-in detector U4, comparer UIB, resistance R 5, R8, R10, R14, capacitor C11, C12 form, comparer UIB output DET1 termination is gone into single-chip microcomputer pin RB5 end, and and positive input between cross-over connection resistance R 10; Comparer UIB positive input connects capacitor C12, resistance R 14 ground connection parallel with one another through resistance R 8 one tunnel, and another road connects built-in detector U4; The A termination single-chip microcomputer pin RA1 end of built-in detector U4, the B termination warning sensitivity control circuit of built-in detector U4.

For the reference resistance of alarm set point gas concentration is set better, can realize reliable warning by the concentration adjustment reference resistance of judging combustion gas; The warning sensitivity control circuit comprises resistance R 17, the reference resistance VR1 that is in series, and its AN2 termination is gone into single-chip microcomputer pin RA3 end; Its ACOM end DISCH termination of resistance R 5 in built-in warning circuit is gone into single-chip microcomputer pin RA2 end, and reference resistance VR1 resistance is adjusted the may command warning sensitivity, and its ACOM end is also through capacitor C11 ground connection.

For optimizing external combustion gas detector better, make it to have same performance with built-in combustion gas detector, power supply in the external warning circuit, failure indicating circuit G are by comparer UIA, resistance R 4, R7, R9, R11, capacitor C13, C14, diode D1 forms, comparer UIA output DET0 termination is gone into single-chip microcomputer pin RB0 end, and and positive input between cross-over connection resistance R 11, comparer UIA negative sense input VREF end also connects capacitor C14, diode D1 ground connection, and also meet filtering circuit output voltage V CC through resistance R 7; Comparer UIA positive input connects capacitor C13, resistance R 4 ground connection parallel with one another through resistance R 9, and connects the S terminal socket of the external detector that is used to peg graft.

External detector F comprises being provided with to be fitted in to pay and pays the machine internal circuit on the machine circuit plate, and this pair machine internal circuit is by external detector U5, resistance R 18, R19, R20, and the light emitting diode L5 that is used for the light emitting diode L4 of power supply indication and is used for indicating fault forms; The resistance R 19 of wherein, connecting with light emitting diode L5 inserts single-chip microcomputer pin RB0 end; The A end of external detector U5 connects single-chip microcomputer pin RA0 end, and also through resistance R 20 ground connection; The B termination warning sensitivity control circuit ACOM end of this external detector U5; 1 end of this external detector U5 connects filtering circuit output voltage V CC, and through resistance R 18, light emitting diode L4 ground connection.

For ease of indication and observation and judgement, pilot lamp is light emitting diode L1, L2, L3, pilot lamp 8 selects for use green LED as power light for light emitting diode L1, pilot lamp 6 selects for use red LED as the leakage alarm pilot lamp for light emitting diode L2, and pilot lamp 7 selects for use yellow led as the fault alarm pilot lamp for light emitting diode L3.

The utlity model has following characteristic:

1. have two cover combustion gas detectors and claim two probes again; One cover built-in detector is contained in the host box, another set of external detector is contained in the round plastic box and is connected with host box " S " terminal socket with " S " joint by signal line, it can directly install on the easy position of leaking of combustion gas, as gas kitchen ranges bottom or gas heater place, it has the double insurance effect.

2. have Based Intelligent Control, self-failure warning system; Can check the quality of the gas-sensing probe of the intact degree of alarm and built-in and external detector voluntarily.

When one of them gas-sensing probe damaged, yellow malfunction indicator lamp 7 just can not stopped glittering, and this moment, the utility model still was in intact duty, because wherein a probe is still in operate as normal.If another one probe also damages, alarm promptly can be lost the measuring ability to gas leakage like this, and at this moment, alarm is then ceaselessly reported to the police to the user with very brief tweeting sound and glittering red led 6, causes that the user notes.Treat that the user fixes a breakdown behind the gas-sensing probe that more renews, then reporting to the police stops; The utility model You Jin goes into normal intact duty.

3. the utility model simple installation, dependable performance, it is fit to gas pipeline supporting, and need not to change the pipeline present situation, and therefore, it is to all various gas supply pipeline systems: the user who comprises liquefied gas, rock gas, the coal gas installation that all suit.

4. the utility model is suitable for using the user of bottled gas very much, as long as the equipped electronic opening/closing device of gas valve can play the safeguard protection effect to the user.

Though the utility model illustrates and describes by the reference preferred embodiment,, those skilled in the art should understand, and in the scope of claims, can do the various variation on form and the details.

Claims

1, gas leakage alarm closer comprises host box, is shaped on the built-in detector pore on this host box panel, and power connection, the pilot lamp that is connected on the described internal circuit is housed; Be provided with the internal circuit that contains power circuit that is fitted on the host line plate in host box, described power circuit includes current rectifying and wave filtering circuit and mu balanced circuit, it is characterized in that:

B. described internal circuit comprises the single-chip microcomputer that can write control program in advance, the leads ends correspondence that this single-chip microcomputer has is connected to reset circuit, oscillatory circuit, mu balanced circuit, audible alarm circuit, the electronic keying control circuit of gas valve, oneself's detection alarm indicating circuit, the built-in warning circuit that contains built-in detector, warning sensitivity control circuit, external warning circuit; This internal circuit cooperates the control program that writes in advance to have system's detection and the effect of main frame self check fault alarm; This warning sensitivity control circuit contains integrating condenser and is used to be provided with the reference resistance of alarm set point gas concentration, and the output resistance in this reference resistance and the built-in warning circuit, external warning circuit output resistance can alternately cooperate the integrating condenser charging respectively;

2, gas leakage alarm closer according to claim 1 is characterized in that: described single-chip microcomputer has reduced instruction, and the single-word instruction collection is with respect to multibyte sophisticated vocabulary effect; This single-chip microcomputer leads ends is respectively: external detector output resistance measuring junction RA0; Built-in detector output resistance measuring junction RA1; The discharge end RA2 of integrating capacitor C11; Warning sensitivity reference resistance measuring junction RA3; External breakdown detector indication output end RB0; Built-in detector oneself detection failure indication output end RB2; The electronic opening/closing device of gas valve control output end RB3; External detector detection signal input end RB4; Built-in detector lamp detection signal input end RB5; Gas leakage alarm indication output end RB6; Audible alarm output terminal RB7.

3, gas leakage alarm closer according to claim 1 and 2 is characterized in that:

A. described audible alarm circuit is made up of resistance R 15, triode Q1, hummer SP, the SPK termination of resistance R 15 is gone into described single-chip microcomputer pin RB7 end, the other end of resistance R 15 inserts the base stage of triode Q1, triode Q1 grounded emitter, triode Q1 collector series connection hummer SP inserts described output voltage V H;

B. described self-detection alarm indicating circuit is made up of the light emitting diode L2 and the light emitting diode L3 of resistance R 12, resistance R 21, described pilot lamp; The ALED1 termination of resistance R 12 is gone into described single-chip microcomputer pin RB6 end, and the other end of resistance R 12 is through light emitting diode L2 ground connection; The ALED2 termination of resistance R 21 is gone into described single-chip microcomputer pin RB2 end, and the other end of resistance R 21 is through light emitting diode L3 ground connection;

C. the electronic keying control circuit of described gas valve is made up of relay R LY1, diode D2, triode Q2, resistance R 16, the relay R LY1 that is in parallel with diode D2 is used to control the electronic opening/closing device keying of gas valve, the one termination is gone into described output voltage V H, its other end connects triode Q2 collector, triode Q2 grounded emitter, triode Q2 base stage inserts described single-chip microcomputer pin RB3 end through resistance R 16;

D. described built-in warning circuit is by built-in detector U4, comparer UIB, resistance R 5, R8, R10, R14, capacitor C11, C12 form, comparer UIB output DET1 termination is gone into described single-chip microcomputer pin RB5 end, and and positive input between cross-over connection resistance R 10; Comparer UIB positive input connects capacitor C12, resistance R 14 ground connection parallel with one another through resistance R 8 one tunnel, and another road connects built-in detector U4; The described single-chip microcomputer pin of the A termination RA1 end of built-in detector U4, the described warning sensitivity control circuit of the B termination of built-in detector U4.

4, gas leakage alarm closer according to claim 3 is characterized in that: described warning sensitivity control circuit comprises the resistance R 17 that is in series, described reference resistance VR1, and its AN2 termination is gone into described single-chip microcomputer pin RA3 end; Its ACOM end DISCH termination of resistance R 5 in described built-in warning circuit is gone into described single-chip microcomputer pin RA2 end, and reference resistance VR1 resistance is adjusted the may command warning sensitivity, and its ACOM end is also through capacitor C11 ground connection.

5, gas leakage alarm closer according to claim 4, it is characterized in that: the power supply in the described external warning circuit, failure indicating circuit are by comparer UIA, resistance R 4, R7, R9, R11, capacitor C13, C14, diode D1 forms, comparer UIA output DET0 termination is gone into described single-chip microcomputer pin RB0 end, and and positive input between cross-over connection resistance R 11, comparer UIA negative sense input VREF end also connects capacitor C14, diode D1 ground connection, and also meet described filtering circuit output voltage V CC through resistance R 7; Comparer UIA positive input connects capacitor C13, resistance R 4 ground connection parallel with one another through resistance R 9, and connects the S terminal socket of the external detector that is used to peg graft.

6, gas leakage alarm closer according to claim 4 is characterized in that: described reset circuit is composed in series by the capacitor C8 of resistance R 13 and ground connection, and this resistance R 13 inserts described single-chip microcomputer pin MCLR end with capacitor C8 contact; Described oscillatory circuit comprises crystal oscillator CRY, and this crystal oscillator CRY two ends are connected with capacitor C9, the capacitor C10 of ground connection respectively, and this crystal oscillator CRY two ends also are connected to described single-chip microcomputer pin OSC1 end and pin OSC2 end respectively.

7, gas leakage alarm closer according to claim 6, it is characterized in that: described external detector comprises being provided with to be fitted in to pay pays the machine internal circuit on the machine circuit plate, this pair machine internal circuit is by external detector U5, resistance R 18, R19, R20, the light emitting diode L4 that is used for the power supply indication forms with the light emitting diode L5 that is used for indicating fault; The resistance R 19 of wherein, connecting with light emitting diode L5 inserts described single-chip microcomputer pin RB0 end; The A end of described external detector U5 connects described single-chip microcomputer pin RA0 end, and also through resistance R 20 ground connection; The described warning sensitivity control circuit of the B termination ACOM end of this external detector U5; 1 end of this external detector U5 connects described filtering circuit output voltage V CC, and through resistance R 18, light emitting diode L4 ground connection.

8, gas leakage alarm closer according to claim 7, it is characterized in that: described single-chip microcomputer pin TOCK1 end is gone into through described mu balanced circuit GND termination, and the light emitting diode L1 of the described pilot lamp through being in series, resistance R 1 connect the Vin end of stabilivolt GND.

9, gas leakage alarm closer according to claim 8, it is characterized in that: described pilot lamp is light emitting diode L1, L2, L3, light emitting diode L1 selects for use green LED as power light, light emitting diode L2 selects for use red LED as the leakage alarm pilot lamp, and light emitting diode L3 selects for use yellow led as the fault alarm pilot lamp.

10, gas leakage alarm closer according to claim 9 is characterized in that: described single-chip microcomputer adopts PIC16C56 and compatible chip; Described current rectifying and wave filtering circuit output voltage is that VH is direct current 12V, and described mu balanced circuit output voltage is that VCC is direct current 5V.