CN2207580Y - Fuel gas alarm - Google Patents

Abstract

The utility model relates to a fuel gas alarm, which is composed of an electromagnetic valve and an electronic monitor unit, wherein, the electromagnetic valve can be automatically closed under the action of the energizing coil, a valve stem can be fastened with the locking hole of a transverse push rod through a clamping opening, and the self-locking function can be realized; the monitor is composed of a power supply circuit, a preheating circuit, a preheating display circuit, a voltage comparator circuit, a control circuit, a delaying timing circuit, an anti-jamming circuit, and an acoustic-optic alarm circuit. When the fuel gas leakage occurs, the test end of a sensor converts to a high level, and the control circuit can start an exhaust fan firstly and delays for a definite time; if the leakage is not eliminated, the control circuit can start the electromagnetic valve, and the gas source is cut off; meanwhile, an acoustic-optic alarm can send out the alarm, and the use is safe.

Description

Fuel gas alarm

The utility model relates to a kind of flammable gas alarm, is used for sewing of inflammable gas monitored automatically and reported to the police.

Inflammable gas such as coal gas, oil liquefied gas, rock gas etc. are all inflammable and explosive, easily poison, and therefore need strictness to prevent that it from sewing and stretch, and to avoid blast, fire and intoxication accident.Though there are various flammable gas alarms to hear generation at present, big multistability and sensitivity are relatively poor, and the wrong report phenomenon happens occasionally.

It is reliable that the purpose of this utility model provides a kind of sensitivity, can report to the police, again the flammable gas alarm that can monitor automatically.

The utility model is made up of a solenoid valve and an electronic monitor, solenoid valve comprises valve body, spool, valve rod, valve casing and bonnet, be provided with solenoid in the valve casing, it is characterized in that spool is provided with the top spring, valve rod is made up of upper and lower depression bar and a moving iron core that is in the solenoid magnetic field, upperpush rod and a horizontal push rod be with the lockhole cross-under, and can interlock with lockhole by bayonet socket and to close the valve self-locking, and laterally push rod the inner is fixed on the bonnet inwall with extension spring.This solenoid valve cuts out valve by pushing upperpush rod or making valve rod promote spool downwards by solenoid to the action of a magnetic field of moving iron core, meanwhile, the bayonet socket of upperpush rod automatically and lockhole interlock, make the valve rod self-locking.During release, need to promote horizontal push rod compression extension spring, valve rod is upwards resetted by top spring effect and opens valve; Electronic monitor is made up of power circuit, preheating, display circuit I, voltage comparator circuit II, time-delay timing circuit III, control circuit III and III ' anti-jamming circuit II, sound light alarming circuit VI, the input termination power E+ of preheating display circuit I, the preheating display circuit has two output terminals, an end EE sending and receiving optical diode LED ₁Positive pole, other end DD connects the input end of voltage comparator circuit.

Two output terminals of voltage comparator circuit II meet the time-delay input end AA of timing circuit and the input end BB of control circuit III respectively, the output terminal connection control circuit III of time-delay timing circuit ' input end CC; The output relay termination J of control circuit III ₁Coil, the control circuit III ' output relay termination J ₂Coil; J ₁Contact switch J _1-1The fan P that runs in, J ₂Contact switch J _2-1Meet solenoid valve D; Comparison amplifier IC in the positive-negative input end of anti-jamming circuit II and the time-delay timing circuit ₉The positive and negative terminal correspondence join output terminal B, the C of anti-jamming circuit and the oscillator IC in the sound light alarming circuit VI ₇, IC ₈Output terminal B ', C ' correspondence join, the input end A ' of sound light alarming circuit with the time-delay timing circuit in IC ₉Output terminals A join.

The utility model adopts dual warning output and time-delay timed sequence structure on circuit design, when inflammable gas generation leakage reaches demarcation concentration, start exhaust fan by the output of control circuit III earlier, it is outdoor that combustible gas is discharged, and do not get rid of if leak yet, gas concentration still surpasses calibration value, then delay time behind the certain hour, control circuit III ' output starts solenoid valve, and moving iron core moves downward, turn-off source of the gas, the valve rod self-locking; Start sound light alarming circuit simultaneously, send sound and light alarm.Behind the time-delay certain hour, the control circuit III ' output recover zero level, the coil blackout of solenoid valve, but the solenoid valve self-locking mechanism is locked, still is in the valve state that closes behind the coil blackout.After leakage failure is got rid of, by horizontal push rod, just can open valve, recover normal ventilation.

In sum, this fuel gas alarm circuit structure and electromagnetic valve structure are reasonable, can not report mistake by mistake, and coil is energising in the short period of time only, thus the unsafe factor of having avoided the heat because of long-term energising generation to cause.Behind the closed electromagnetic valve self-locking, safety and reliability.

Below in conjunction with description of drawings embodiment of the present utility model.

Fig. 1 is the structural drawing of solenoid valve in the utility model.

Fig. 2 is the circuit block diagram of watch-dog in the utility model.

Fig. 3 is a power circuit diagram.

Fig. 4 be preheating, demonstration, comparison, time-delay regularly, the connecting relation figure of each circuit such as anti-interference and control.

Fig. 5 is sound light alarming circuit figure.

As shown in Figure 1, solenoid valve has valve body 14, spool 13, valve casing 9, bonnet 8, valve rod is made up of upperpush rod 3, down-pressed pole 11 and moving iron core 7, solenoid 10 is arranged in the valve casing, spool has top spring 12, and upperpush rod has step-like bayonet socket 6, and button 2 is equipped with on the top, laterally push rod 1 is provided with lockhole 5, and the inner is fixed on the bonnet 8 with extension spring 4.Fig. 1 is in the valve state that closes, top spring 12 pressurizeds, and bayonet socket 6 is buckled in the lower edge of lockhole 5.When push rod 1 is promoted to the right, extension spring 4 pressurizeds, lockhole 5 moves to right, top spring 12 moves upward valve rod, bayonet socket 6 passes from lockhole, push rod 1 is locked and can not moves, this moment opening of valves.Downwards during pressing button 2, valve rod compression top spring 12 moves downward, and bayonet socket 6 passes lockhole downwards and is stuck in the lockhole lower edge, and push rod 1 resets, and valve cuts out again.

Fig. 3 is a power circuit, and civil power is through transformer B ₁Step-down, diode D ₁-D ₄Rectification, integrated stable voltage circuit IC ₁Voltage stabilizing, capacitor C ₁-C ₃After the filtering, provide stable DC voltage.Among Fig. 3, P is an air exhausting device, and D is a solenoid valve, and K is a hand switch.

As shown in Figure 4, preheating, display circuit I comprise preheat circuit and preheating display circuit.Preheat circuit is by R ₁, R ₂, R ₃, R ₄, C ₄And sensor QM forms.The preheating display circuit is by IC ₄, IC ₃, R ₆, R ₇, R ₈, R ₉, C ₅, C ₆Form.R ₁, R ₂, be IC ₂Negative input end and IC ₄The deviator resistance of positive input terminal, R ₃To C ₄Charging, the formation time constant is 10 minutes time-delay, sensor QM filament voltage is by IC ₁Output is directly supplied with.IC ₃, R ₈, R ₉, C ₅, R ₆, R ₇Form low-frequency oscillatory network, IC ₄Output terminal is through R ₆Meet IC ₃In-phase input end, diode D ₆Positive pole meets IC ₃Output terminal, luminotron LED ₁Through R ₅Ground connection, D ₅Positive pole meets IC ₂Output terminal, negative pole meets LED ₁Anodal.In this circuit, in the QM filament pre-heating process, sensor test end DD does not have test voltage, thereby produces the wrong report phenomenon can avoid preheating the time, this moment LED ₁Luminotron shows with the green glow flicker.After preheating finishes, IC ₃Output terminal transfers low level to, LED ₁The green glow wall is bright, simultaneously IC ₂The output high level is held to DD.Among Fig. 4, the voltage comparator circuit II is by IC ₅And peripheral cell R ₁₀, W, R ₁₁Form IC ₅Positive input terminal be connected with the test lead DD of sensor QM, and pass through R ₄Ground connection.R ₁₀, W is IC ₅The deviator resistance of negative input end.R ₁₂, BG ₁, J ₁Constitute air draft control circuit III, BG ₁Grounded emitter, collector connecting relay J ₁One end of coil, J ₁Another termination power+10V of coil.When the combustible gas leakage, when sensor QM test lead DD magnitude of voltage surpasses setting value, IC ₅Output terminal is a noble potential, and one the tunnel through triode BG ₁Drive relay J ₁Air exhausting device is connected in adhesive, makes combustible gas to outdoor discharge, and another road connects delay circuit, and it is by R ₁₃, C ₆, IC ₉Form, after the said exhaust fan is connected, through R ₁₃, C ₆The time-delay certain hour is not got rid of IC if leak ₅Output terminal still is in high level, IC so ₉The positive input terminal current potential will be greater than negative input end current potential, IC ₉Output terminal also transfer high level to, this moment one group through R ₁₄, R ₁₆Be divided to the sound light alarming circuit of Fig. 5, another is organized through triode BG ₄Drive relay J ₂Adhesive, the solenoid valve D of connection Fig. 3 moves downward moving iron core 7, depression bar 3,11 and the spool 13 of Fig. 1 solenoid valve, turn-offs source of the gas.Meanwhile, by BG ₃, R ₁₅, C ₇The timing circuit of forming begins regularly, R ₁₅And C ₇The decision timing is 10 seconds, surpasses setting-up time, BG ₄Base stage is passed through BG ₃Cause BG down, ₄Be in cut-off state, pass through relay J ₂Discharge and the cut-out power of electromagnetic valve, this moment, though coil 10 outages, combustible gas still can not leak again because valve has cut out self-locking.Among Fig. 4, by IC ₆, R ₁₉, R ₁₈, BG ₂, D ₇, D ₈Form anti-jamming circuit, IC ₆Positive input terminal and IC ₂Negative input end join IC ₆Negative input end and IC ₉Positive input terminal joins.Under non-alarm condition, IC ₆The output high level, BG ₂Base stage is through R ₁₉With IC ₆Output terminal joins, grounded emitter, and collector is through R ₁₈Be connected to power supply+5V.Anti-jamming circuit is mainly eliminated high-frequency interferencing signal, avoids power connection misoperation and the wrong report of moment.

Fig. 5 is sound light alarming circuit figure, among the figure A ' end, B ' end C ' end respectively with Fig. 4 in R ₁₄Output terminals A and D ₇D ₈Output terminal B, C join.Among Fig. 5, by IC ₇, R ₂₃, R ₂₂, R ₂₀, C ₈Form low-frequency oscillation, by IC ₈, R ₂₄, R ₂₅, R ₂₁, C ₉, form the higher-order of oscillation, red luminotron LED ₂Positive pole is connected to IC ₇Output terminal, negative pole is through R ₂₆Ground connection; R ₂₇, BG ₅, D ₉, B ₂, FM forms sound circuit, BG ₅Base stage is through R ₂₇Meet IC ₈Output terminal, emitter is through D ₉Ground connection, collection earth polar and B ₂Join.Through R ₂₂, R ₂₀, R ₂₁, R ₂₄, low frequency signal is modulated in the high-frequency signal LED ₂Luminous synchronous with buzzer FM sounding, promptly send sound and light alarm simultaneously.

Among Fig. 4, Fig. 5, IC ₂-IC ₉Constitute by two LM324 type integrated packages, wherein IC ₅, IC ₂, IC ₇, IC ₈, be one, IC ₃, IC ₄, IC ₆, IC ₉Be another piece.

Claims (1)

1. Flammable gas alarm, form by solenoid valve and electronic monitor, solenoid valve comprises in valve body, spool, valve rod, valve casing, bonnet, the valve casing and is provided with solenoid, it is characterized in that spool is provided with the top spring, valve rod is made up of upper and lower depression bar and a moving iron core, upperpush rod and a horizontal push rod be with the lockhole cross-under, and can interlock with lockhole by bayonet socket and to close the valve self-locking, and laterally push rod the inner is fixed on the bonnet inwall with extension spring; Electronic monitor by power circuit, preheating, display circuit I, voltage comparator circuit II, time-delay timing circuit IV, control circuit III and III ', anti-jamming circuit

   

   , the sound light alarming circuit VI forms, the input termination power E+ of preheating, display circuit I, preheating, display circuit have two output terminals, an end EE sending and receiving optical diode LED ₁Positive pole, other end DD connects the input end of voltage comparator circuit; Two output terminals of voltage comparator circuit II connect respectively the input end BB of time-delay input end AA of timing circuit and control circuit III, the output terminal connection control circuit III of time-delay timing circuit ' input end CC, the output relay termination J of control circuit III ₁Coil, the control circuit III ' output relay termination J ₂Coil; J ₁Contact switch J _1-1The fan P that runs in, J ₂Contact switch J _2-1Meet solenoid valve D; Comparison amplifier IC in the positive and negative input end of anti-jamming circuit V and the time-delay timing circuit ₉Positive and negative end correspondence join output terminal B, the C of anti-jamming circuit and the oscillator IC in the sound light alarming circuit VI ₇, IC ₈Output terminal B ', C ' correspondence join, the input end A ' of sound light alarming circuit with the time-delay timing circuit in IC ₉Output terminals A join.

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