CN2258614Y - Gas-leakage dc low-voltage alarm cutting off controller - Google Patents

Abstract

The utility model provides a gas-leakage dc low-voltage alarm closing controller, which comprises a gas-leakage detection circuit, a comparison driving circuit, an electronic switch circuit, an audible and visual alarm circuit, an electromagnetic valve circuit, and a dc power supply circuit, wherein the output of the gas-leakage detection circuit is connected with the input of the comparison driving circuit, the output of the comparison driving circuit is connected with the input of the electronic switch circuit, and the output of the electronic switch circuit is respectively connected with the input of the audible and visual alarm circuit and the input of the electromagnetic valve circuit. When gas leakage is generated, the utility model can not only alarm, but also actuate the valve to close automatically. Therefore, the utility model has safety.

Description

Gas leakage dc low-voltage Alerts Off controller

The utility model relates to a kind of alarm, particularly relates to a kind of gas leakage dc low-voltage Alerts Off controller.

Existing Fuel Gas Leak Alarm only has the function of sending sound, light warning when gas leakage concentration reaches predetermined value, can not close gas check valve automatically, blocks source of the gas and guarantees safety.Chinese patent 90211217.1 discloses the leaking gases alarm a kind of and logotype of gas leakage alarm security personnel reduction valve, the function of warning and valve-off when having gas leakage concurrently, but electric main is all used in its realization and the control power supply partly of closing the valve function, it is dangerous that high pressure closes valve first, moreover running into power failure or inconvenient place of using alternating current, this alarm just can not use.

The purpose of this utility model is to provide a kind of use low-voltage dc power supply, and has the undervoltage warning function, the gas leakage dc low-voltage Alerts Off controller that also can use alternating current to power behind step-down rectifier.

The utility model gas leakage dc low-voltage Alerts Off controller comprises the gas leakage testing circuit, compare driving circuit, electronic switching circuit, sound light alarming circuit and electromagnetic valve circuit, and DC power supply circuit, its annexation is, the output of gas leakage testing circuit connects the input of comparison driving circuit, relatively driving circuit output connects the electronic switching circuit input, electronic switching circuit output connects sound light alarming circuit and electromagnetic valve circuit input respectively, and DC power supply circuit connects sound light alarming circuit and electromagnetic valve circuit.Wherein leak gas testing circuit by gas sensor QM, integrated operational amplifier A1, light emitting diode D1, resistance R 1～R3, adjustable resistance W1 and diode D2 constitute; Compare driving circuit by operational amplifier A 2～A4, capacitor C 1, C2, resistance R 4～R13 constitutes; Electronic switching circuit is made up of triode BG1～BG3; Sound light alarming circuit is made up of hummer FMQ and light-emitting diodes D3 pipe; Electromagnetic valve circuit is made up of magnet coil L and diode D4, button switch K; DC power supply circuit is by triode BG4～BG5, diode D5～D7, and resistance R 14～R16, adjustable resistance W2 and direct supply EC form.

The principle of work of the utility model gas leakage dc low-voltage Alerts Off controller is, when gas leakage reach finite concentration by the gas leakage testing circuit in the observation circuit output voltage formed of QM and R2 when being higher than the threshold voltage of setting by R3 and W1, A1 exports noble potential and exports the comparison driving circuit to by D2.Relatively R8～R10 and A3, A4 form two voltage comparator circuits in the driving circuit, when A1 output noble potential, the in-phase input end current potential of A3, A4 is higher than the inverting input current potential, and A3, A4 all export noble potential, exports BG2 and BG3 in the electronic switching circuit to by R12, R13 respectively, the BG2 conducting is amplified, drive FMQ and D3, sound and light alarm takes place, also conducting amplification of BG3 simultaneously, form pulse current and make magnet coil L energising, drive connected closed electromagnetic valve.In order to make the electric energy of no longer a large amount of electric consumption EC behind the closed electromagnetic valve, this controller is provided with by what resistance R 11, capacitor C 2, triode BG1 formed and blocks delay circuit, when A4 output noble potential, the BG3 conducting, when driving closed electromagnetic valve, this noble potential charges to G2 by R11, through the t1 time, the current potential of C2 rises to when being enough to make the BG1 conducting, and BG3 ends, and blocks the electric current among the L.Because gas sensor QM is after energising several minutes, it is stable that its parameter just can reach, and closes valve for preventing energising initial stage mistake, forms the initial time delay circuit by A2, C1, R4～R7 and BG1, when power connection is initial, EC charges to C1 by R4, and R4 voltage is added to the A2 in-phase input end near EC voltage, A2 exports noble potential, drive the BG1 conducting by R7, BG3 is ended, solenoid valve is failure to actuate.Raise with C1 voltage, R4 voltage reduces, and when A2 in-phase input end voltage was lower than inverting input voltage, A2 exported electronegative potential, and BG1 ends, and initial time delay finishes, and circuit enters normal operating conditions.For guaranteeing the reliable and stable work of controller, EC must have enough voltage, for this reason, by BG4, BG5, D5～D7, R14～R16 and W2 form undervoltage warning circuit.When EC voltage is lower than setting, R16, D6, the not conducting of D7 branch road, BG5 ends, and EC gives BG4 base stage power supply conducting by W2, and D5 sends the undervoltage warning signal, prompting EC inductive charging.

Can report to the police when the advantage of the utility model gas leakage dc low-voltage Alerts Off controller is gas leakage, can order about valve again and close automatically, adopt low-voltage direct safe and reliable.

Describe the utility model embodiment in detail below in conjunction with accompanying drawing

Fig. 1: the utility model circuit block diagram

Fig. 2: the utility model circuit connection diagram.

This reality has novel gas leakage dc low-voltage Alerts Off controller to comprise gas leakage testing circuit, comparison driving circuit, electronic switching circuit, sound light alarming circuit and electromagnetic valve circuit, and DC power supply circuit.Annexation is, the output of gas leakage testing circuit connects the input of comparison driving circuit, and relatively driving circuit output connects sound light alarming circuit and electromagnetic valve circuit input respectively, and DC power supply circuit output connects sound light alarming circuit and electromagnetic valve circuit input.Wherein leak gas testing circuit by gas sensor QM, operational amplifier A 1 (TL084), and light emitting diode D1, resistance R 1～R3, adjustable resistance W1 and diode D2 constitute; Compare driving circuit by operational amplifier A 2～A4 (TL084), capacitor C 1, C2, resistance R 4～R13 constitutes; Electronic switching circuit is made of triode BG1～BG3; Sound light alarming circuit is made of hummer FMQ and light emitting diode D3; Electromagnetic valve circuit is by magnet coil L, and diode D4 and button switch K constitute; DC power supply circuit is by triode BG4, BG5, diode D5～D7, and resistance R 14～R16, adjustable resistance W2 and direct supply EC constitute.It is connected to, and the QM-fire end connects the EC positive pole, and another fire end is by R1 ground connection, and QM-exports termination EC positive pole, another output termination A1 in-phase input end.D1 and R1 also connect minus earth.R2 one termination QM and A1 link, other end ground connection.R3 one termination EC positive pole, ground connection behind the other end series connection W1, R3 and termination A1 inverting input during W1 is connected.The D2 positive pole connects A1 output, and the D2 negative pole connects R8, A3 and A4 in-phase input end.The in-phase input end of A2 meets C1 and is connected middle-end with R4, another termination of C1 EC positive pole, R4 other end ground connection.The A2 inverting input meets R5 and is connected middle-end with R6, another termination of R5 EC positive pole, R6 other end ground connection.R7 one termination A2 output, another termination R11 and C2 one end and BG1 base stage.The in-phase input end of A3 and A4 is connected, and is connected to the end of R9 and R10, another termination EC positive pole of R9, K10 other end ground connection.R12 one termination A3 output, another termination BG2 base stage.R13 is connected between A4 output terminal and the BG3 base stage.The BG1 collector connects the BG3 base stage, its grounded emitter.The BG2 collector connects the D3 negative pole, its grounded emitter.The BG3 collector connects L and K one end, grounded emitter, and the D4 positive pole meets L and is connected middle-end with K, FMQ one termination EC, another termination D3 positive pole, the D3 negative pole connects the BG2 collector.The D4 negative pole and the L other end are with being connected to positive source.The other end ground connection of K.The termination EC positive pole of R14, R16, W2, another termination of R14 D5 positive pole, the D5 negative pole connects the BG4 collector.W2 one termination BG4 base stage.The BG5 collector connects the BG4 base stage and is connected middle-end with W2.Another termination of R16 D6 negative pole, the D6 positive pole connects R15 one end and D7 positive pole, D7 minus earth.BG4, BG5 grounded emitter.

Claims (2)

1, a kind of gas leakage dc low-voltage Alerts Off controller, it is characterized in that comprising the gas leakage testing circuit, compare driving circuit, electronic switching circuit, sound light alarming circuit and electromagnetic valve circuit, and DC power supply circuit, its annexation is, the output of gas leakage testing circuit connects the input of comparison driving circuit, relatively driving circuit output connects the electronic switching circuit input, and electronic switching circuit output connects sound light alarming circuit and electromagnetic valve circuit input respectively, and DC power supply circuit connects sound light alarming circuit and electromagnetic valve circuit.

2, gas leakage dc low-voltage Alerts Off controller as claimed in claim 1, the testing circuit that it is characterized in that leaking gas be by gas sensor QM, integrated operational amplifier A1, and light emitting diode D1, resistance R 1～R3, adjustable resistance W1 and diode D2 constitute; Compare driving circuit by operational amplifier A 2～A4, capacitor C 1, C2, resistance R 4～R13 constitutes; Electronic switching circuit is made of triode BG1～BG3; Sound light alarming circuit opens FMQ by hummer and light emitting diode D3 constitutes; Electromagnetic valve circuit is by magnet coil L, and diode D4 and button switch K constitute; DC power supply circuit is by triode BG4, BG5, diode D5～D7, and resistance R 14～R16, adjustable resistance W2 and direct supply EC constitute.

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