CN2464578Y

CN2464578Y - Conbustion gas leakage alarm for vehicle

Info

Publication number: CN2464578Y
Application number: CN 01214075
Authority: CN
Inventors: 祝开三
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-07
Filing date: 2001-02-07
Publication date: 2001-12-12
Anticipated expiration: 2011-02-07

Abstract

The utility model relates to a combustion gas leakage alarm for a vehicle, which comprises gas-sensitive detection circuit connecting comparator IC2 and an amplifying circuit VT1. A time delay circuit IC4 is connected with the input end of the gas-sensitive detection circuit, and the output ends of the comparator and the amplifying circuit are connected with light emitting alarm circuits IC3, sound alarm circuits IC5 and gas source control circuits VT3 and J1 for closing gas pipelines. The model number of the IC1 is UA7806, the model number of the IC2 is UA741, and the model numbers of the IC3 and the IC4 are NE555. When combustible gas leaks, the utility model automatically sends out sound and light alarm, and simultaneously and automatically closes the gas source of the gas pipeline to prevent accidents from happening. The utility model has the advantages of simple structure and small size. The utility model can be used for leakage alarm for vehicles, natural gas, coal gas and liquefied gas bottles of household pipelines, and combustible gas of public mines and enterprises.

Description

Automobile-used combustible gas leakage alarm

The utility model relates to automobile-used combustible gas leakage alarm.

Under the prerequisite of China with reference to No. two standards in Europe and California, USA standard, more and more stricter to the exhaust emission control of travelling.Be the protection environment; increasing automobile adopts the alternative fuel of flammable liquid oxidizing gases as gasoline, and this not only effectively reduces discharging but also fuel saving expense, and this just need report to the police with the leakage of fire gases to automobile; avoid contaminated environment, avoid fire alarm to take place simultaneously.Existing annunciator can only be reported to the police, and warning function is few, can not close the source of the gas of gas pipeline.

The purpose of this utility model be to provide a kind of can be when fire gases take place to leak, sound and light is reported to the police, automobile-used combustible gas leakage alarm.

Technical scheme: see Fig. 1,

Automobile-used combustible gas leakage alarm comprises: gas-sensitive detecting circuit connects comparator and amplifying circuit, and comparator is connected luminous warning circuit with amplifying circuit, and power circuit connects gas-sensitive detecting circuit, comparator and amplifying circuit, luminous warning circuit respectively.

Time delay circuit is connected the input end of gas-sensitive detecting circuit, is connected with the audible alarm circuit at the mouth of comparator and amplifying circuit.

Be connected with at the mouth of comparator and amplifying circuit and close gas pipeline source of the gas control circuit.

The circuit working principle:

Gas-sensitive detecting circuit detects gas leakage, and comparator judges, amplifying circuit amplifying signal, the luminous warning of luminous warning circuit.Time delay circuit is connected the output that the input end of gas-sensitive detecting circuit is stablized gas-sensitive detecting circuit, the warning of sounding of audible alarm circuit.Closing gas pipeline source of the gas control circuit automatic guidance electromagnetic valve, cut off the gas pipeline source of the gas, is powerful guarantee to what prevent accident.

The utility model characteristics:

1, design has the start time delay circuit IC4 of source of stable pressure.

2, design has the low-power consumption sound light alarming circuit.

3, design has the control circuit of automatic self-closing gas pipeline source of the gas.

4, design has electric power polarity protection diode D1, prevents to connect anti-power supply and the faiture alarm device.

5, voltage range is wide, can be in direct current 8V to 18V reliable operation.

6, gas sensitivity height, lower limit can detect the 100ppm leakage value.

7, the annunciator volume is little, installs simple and convenient.Simple in structure, the circuit layout compact and reasonable, cost is low, and safety performance is good.

8, not only automobile can be used, and also can be used for family's pipe natural gas, coal gas, liquefied gas bottle and public ore deposit enterprise combustible gas leakage is reported to the police.

Description of drawings:

Fig. 1: automobile-used combustible gas leakage alarm functional-block diagram.

Fig. 2: embodiment 1 schematic circuit diagram.

Fig. 3: embodiment 2 schematic circuit diagram.

Embodiment 1: see Fig. 2, the model of IC1 is UA7806, and the model of IC2 is UA741, and the model of IC3, IC4 is NE555.12V power supply be connected in series rectifier diode D1, source switch K1, three-terminal voltage-stabilizing device IC1 input end, three-terminal voltage-stabilizing device IC1 mouth be connected in series resistance R 1 and light-emitting diode D2, C1 is that power supply moves back lotus root electric capacity, is connected to three-terminal voltage-stabilizing device IC1 mouth; Three-terminal voltage-stabilizing device IC1 mouth connects C pin, resistance R 3,7 pin of comparator IC2 and the collecting electrode of aerotron VT1 of gas sensor Q1; Resistance R 3, potential device W1, resistance R 4 series connection, resistance R 2 connects the B end of gas sensor Q1, the swing arm of potential device W1 connects input 2 pin of comparator IC2, the B end of gas sensor Q1 connects input 3 pin of IC2, comparator IC2 mouth 6 pin connect the base stage of aerotron VT1, the emitter of aerotron VT1 connects capacitor C 2, resistance R 5,4 of IC 3,8 pin, 7 pin connecting resistance R5 of IC 3, the point of connection of R6,6 of IC 3,2 pin connecting resistance R6, the point of connection of capacitor C 3,3 pin connecting resistance R7 of IC 3, the anodal connecting resistance R7 of light-emitting diode D3, the negative pole of 12V power supply connects three-terminal voltage-stabilizing device IC1 ground terminal, capacitor C 1 negative pole, the D end of gas sensor Q1, resistance R 2, R4,4 pin of IC2, capacitor C 2 negative poles, capacitor C 3,1 pin of IC 3, the negative pole of light-emitting diode D3.

Principle of work: the 12V power supply by three-terminal voltage-stabilizing device IC1 voltage stabilizing, provides 6V constant voltage power suspply to circuit through rectifier diode D1, source switch K1, and light-emitting diode D2 lights, the indication energized.Wherein R1 is the current-limiting resistance of D2, and C1 is that power supply moves back lotus root electric capacity, stabilizing circuit work.Resistance R 2, R3, R4, potential device W1 form resistance and divide the position network.Wherein the equivalent resistance at the A of R2 and gas sensor Q1, B two ends carries out the branch position.R3, R4, W1 are that the benchmark of IC2 divides the position network, and W1 is used for fine setting.IC2 is an op amp that voltage is wide, forms the alarm set point initialization circuit with R2, R3, R4, W1, Q1.When A, B two ends equivalent resistance and the R2 resistance of gas sensor Q1 carries out dividing potential drop, this voltage is given the 3rd pin of IC2, and R3, R4, W1 give IC2 a benchmark comparative voltage, and this voltage is delivered to the 2nd pin of IC2, owing to there is not gas leakage, Q1 is stored in A, B two ends equivalent resistance is bigger, and therefore, IC2 the 3rd pin voltage ratio the 2nd pin is low, the 6th pin output active potential of IC2, approach zero,, thereby do not work so time-base integrated circuit IC3 must not be electric.When Q1 detected gas leakage, the equivalent resistance at the A of Q1, B two ends sharply reduced, and after the R2 dividing potential drop, caused the 3rd pin current potential of IC2 to increase, at this moment, because the 6th pin of IC2 output high potential approaches power line voltage.Amplify through aerotron VT1 electric current, supply with basis set and become the oscillating circuit of IC circuit 3, resistance R 5, R6, capacitor C 3 compositions to make IC3 produce vibration,,, drive the luminous warning of light-emitting diode D3 by resistance R 7 current limlitings by the square-wave signal of one several hertz of the 3rd pin outputs.

The start time delay circuit comprises: 7 pin of time base integrated package IC4,6 pin connect the point of connection of resistance R 8 and capacitor C 4,3 pin of IC4 connect the A end of gas sensor Q1,2 pin of IC4 connect resistance R 9, the 1 pin ground connection of capacitor C 4, resistance R 9 and IC4,4 pin of IC4,8 pin and resistance R 8 are connected the mouth of three-terminal voltage-stabilizing device IC1.The start time delay circuit makes the current supply generation time-delay of A, B end with the R2 of gas sensor Q1.Its purpose is stored resistance value at tens of kilo-ohms because of gas sensor Q1, send electricity back resistance to increase in time and sharply drops to hundreds of Europe, increases again then and tends towards stability.Design start time delay circuit is in order to avoid cause the flase alarm of start during the initial stage.

Embodiment 2: Fig. 3 increases on the basis of embodiment 1: audible alarm circuit and cut-out gas pipeline source of the gas control circuit.

The audible alarm circuit comprises: by IC 5 models is the audible alarm circuit that SO22-9561, electric current amplifying triode VT2, loud speaker Y, power supply decoupling capacitance C5, diode D4, D5, resistance R 10 etc. are formed; Diode D4, D5 series connection, D4 connects the emitter of aerotron VT1,4 pin of diode D5 negative pole, IC5, loud speaker Y, capacitor C 5 positive poles link together, 1,2 pin connecting resistance R10 of IC 5, the 3 pin ground connection of IC5,5 pin of IC5 connect the base stage of aerotron VT2, the grounded emitter of VT2, the collecting electrode of VT2 meets loud speaker Y, capacitor C 5 negativing ending groundings.Principle of work: when the automobile no leak,, D4 is set, the D5 purpose is for IC5 is provided with power voltage-drop, prevents that the pronunciation of IC5 mistake from reporting to the police owing to during IC2 output active potential, still have a little voltage.During gas leakage, when power supply when D4, D5 supply with IC5, by IC5 the 5th pin output signal, promote loud speaker Y pronunciation through aerotron VT2.

Closing gas pipeline source of the gas control circuit comprises: be made up of resistance R 11, electric current amplifying triode VT3, relay J 1, absorption diode D6.The base stage of aerotron VT3 connects resistance R 11, resistance R 11 connects the emitter of aerotron VT1, the grounded emitter of aerotron VT3, the collecting electrode of aerotron VT3 connect the anodal and relay J 1 of diode D6, the mouth of another termination three terminal regulator IC1 of diode D6 negative pole and relay J 1.Principle of work: when gas leakage, when being detected by Q1, control circuit is supplied with the VT3 bias current by R11, make its JK1 contact that drives the J1 relay send on-off signal, this signal enabling electromagnetic valve action reaches automatic self-closing gas pipeline source of the gas, prevents the purpose that accident takes place.

Claims

1, automobile-used combustible gas leakage alarm, comprise: gas-sensitive detecting circuit connects comparator and amplifying circuit, comparator is connected luminous warning circuit with amplifying circuit, power circuit connects gas-sensitive detecting circuit, comparator and amplifying circuit, luminous warning circuit respectively.

2, automobile-used combustible gas leakage alarm according to claim 1, its feature comprises: 12V power supply be connected in series rectifier diode D1, source switch K1, three-terminal voltage-stabilizing device IC1 input end, three-terminal voltage-stabilizing device IC1 mouth be connected in series resistance R 1 and light-emitting diode D2, C1 is that power supply moves back lotus root electric capacity, is connected to three-terminal voltage-stabilizing device IC1 mouth; Three-terminal voltage-stabilizing device IC1 mouth connects C pin, resistance R 3,7 pin of comparator IC2 and the collecting electrode of aerotron VT1 of gas sensor Q1; Resistance R 3, potential device W1, resistance R 4 series connection, resistance R 2 connects the B end of gas sensor Q1, the swing arm of potential device W1 connects input 2 pin of comparator IC2, the B end of gas sensor Q1 connects input 3 pin of IC2, comparator IC2 mouth 6 pin connect the base stage of aerotron VT1, the emitter of aerotron VT1 connects capacitor C 2, resistance R 5,4 of IC 3,8 pin, 7 pin connecting resistance R5 of IC 3, the point of connection of R6,6 of IC 3,2 pin connecting resistance R6, the point of connection of capacitor C 3,3 pin connecting resistance R7 of IC 3, the anodal connecting resistance R7 of light-emitting diode D3, the negative pole of 12V power supply connects three-terminal voltage-stabilizing device IC1 ground terminal, capacitor C 1 negative pole, the D end of gas sensor Q1, resistance R 2, R4,4 pin of IC2, capacitor C 2 negative poles, capacitor C 3,1 pin of IC 3, the negative pole of light-emitting diode D3; The model of IC1 is UA7806, and the model of IC2 is UA741, and the model of IC3 is NE555.

3, automobile-used combustible gas leakage alarm according to claim 2, its feature comprises: time delay circuit is connected the input end of gas-sensitive detecting circuit, comprise: 7 pin of time base integrated package IC4,6 pin connect the point of connection of resistance R 8 and capacitor C 4,3 pin of IC4 connect the A end of gas sensor Q1,2 pin of IC4 connect resistance R 9, the 1 pin ground connection of capacitor C 4, resistance R 9 and IC4,4 pin of IC4,8 pin and resistance R 8 are connected the mouth of three-terminal voltage-stabilizing device IC1, and the model of IC4 is NE555.

4, automobile-used combustible gas leakage alarm according to claim 3, its feature comprises: the mouth at comparator and amplifying circuit is connected with the audible alarm circuit; Be connected with at the mouth of comparator and amplifying circuit and close gas pipeline source of the gas control circuit.

5, automobile-used combustible gas leakage alarm according to claim 4, its feature comprises:

The sound warning circuit comprises: IC 5 models are SO22-9561, diode D4, D5 series connection, D4 connects the emitter of aerotron VT1,4 pin of diode D5 negative pole, IC5, loud speaker Y, capacitor C 5 positive poles link together, 1, the 2 pin connecting resistance R10 of IC5, the 3 pin ground connection of IC5,5 pin of IC5 connect the base stage of aerotron VT2, the grounded emitter of aerotron VT2, the collecting electrode of aerotron VT2 meets loud speaker Y, capacitor C 5 negativing ending groundings;

Closing gas pipeline source of the gas control circuit comprises: the base stage of aerotron VT3 connects resistance R 11, resistance R 11 connects the emitter of VT1, the grounded emitter of aerotron VT3, the collecting electrode of aerotron VT3 connects the anodal and relay J 1 of diode D6, the mouth of another termination three terminal regulator IC1 of diode D6 negative pole and relay J 1.