CN2103836U - Electronic gas monitor - Google Patents
Electronic gas monitor Download PDFInfo
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- CN2103836U CN2103836U CN 91214897 CN91214897U CN2103836U CN 2103836 U CN2103836 U CN 2103836U CN 91214897 CN91214897 CN 91214897 CN 91214897 U CN91214897 U CN 91214897U CN 2103836 U CN2103836 U CN 2103836U
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Abstract
The utility model discloses an electronic gas monitor, comprising an electrical source, a gas-electricity converting circuit, a sensitivity regulating circuit, a triggering oscillation circuit, a built-in alarm signal circuit, a protection controlling circuit, an initial characteristic compensating circuit, etc. The utility model has the advantages of high speed, simple structure and high sensitivity. False alarm can not be induced for switching on initially or power failure while in use. The electronic gas monitor is applicable for monitoring gas, smoking alarm for a fire at an initial period, and monitoring air pollutions in public occasions.
Description
The utility model belongs to a kind of by there is the alarm of cigarette or gas effect, more particularly to a kind of electronic gas monitor, it is monitored available for escaping gases such as natural gas, coal gas, liquefied petroleum gas, gasoline, carbon monoxide, hydrogen, alkanes, alcohols, ethers, benzene classes, and the alarm of preceding smog is formed available for the burning such as paper, timber, cotton, rubber, woolen, plastic products, grease, it may also be used for monitoring of public arena air pollution etc..
The fuel gas such as natural gas, coal gas, liquefied petroleum gas, huge numbers of families are just entered with the unique advantage such as its convenient, cleaning, pollution-free, replace the indispensable fuel of the three meals in a day such as honeycomb briquette, firewood charcoal, but, usually because improper use, midway is flame-out, pipeline leakage etc. and cause the accidents such as fire, blast, asphyxia, brought about great losses to the country and people's lives and properties.Chinese patent 90204979.8 discloses a kind of Domestic fuel gas leakage alarm, is mainly made up of gas sensor, electronic component and loudspeaker, and when meeting combustion gas, gas sensor sends alarm signal, by electronic component amplification and oscillating alarming circuit, makes loudspeaker sounding;In the utility model patent, due in gas-power conversion circuit output end and triggering IC2Between inserted with delay circuit, make device to the sensitivity decrease of fuel gas, late, when adjustable resistance W sets to zero, alarm just loses ability to work for reflection, while fragile probe measurement electrode, in addition, also depositing the deficiencies such as power failure false alarm in use.
The purpose of this utility model be to provide it is a kind of it is first be powered and had a power failure using midway will not report by mistake, fast to the reaction speed of fuel gas, sensitivity is high, electronic gas stable and reliable in work monitors assembling device.
What the utility model was realized in:A kind of electronic gas monitor, including power supply, gas-power conversion circuit for coupling with power supply and closing gas sensor, the signal detection coupled with gas-power conversion circuit and sensitivity adjusting circuit, with signal detection and sensitivity adjusting circuit are joining oscillating circuit is electronically activated, is with being electronically activated in place of warning circuit in the joining machine of oscillating circuit, its feature:
Described gas-power conversion circuit, by gas sensor a QM, a diode D1, a resistance R2With an electric capacity C11Composition;Diode D1Anode connects positive source, negative electrode and connects gas sensor QM measuring electrodes, the operating voltage for further stable gas sensor QM;Resistance R2One end ground connection, another termination gas sensor QM heating electrodes, for limiting heating electrode cold conditions surge current protection heating electrode;Electric capacity C11Positive termination gas sensor QM measuring electrodes output terminals A, other end ground connection, for filtering out clutter interference and the electric leakage interference of air-sensitive element internal;
Described signal detection and sensitivity adjusting circuit are by a variable resistor W and a diode D2Composition, the termination gas sensor QM measuring electrodes of variable resistor W mono- output terminals A, another terminating diode D2Anode, swing arm connect ic chip3'sEnd, for detecting gas sensor QM gas-electricity conversion signal, while carrying out sensitivity adjustment;Diode D2Anode connects variable resistor W, minus earth, and ic chip is ensured using forward voltage drop 0.7V characteristic3Input fundamental voltage during sensitivity minimization, monitor remains to normal work during for ensureing that variable resistor W swing arms are transferred to least significant end;
Described is electronically activated oscillating circuit by an ic chip3, two resistance R3、R4′, two electric capacity C4、C5Composition, by ic chip3Vc、R, Q ' end and C5、R4、C4、R3Astatic multivibrator is constituted, and by IC9Q ends output machine in alarm signal and defense controls circuit trigger signal;Whether this partial circuit, which works, is controlled by two:One isWhether the voltage levels at end, this voltage is touched fuel gas by gas sensor and is changed, and two be by IC4、C8、C10、R5The gas sensor QM initial characteristics compensation circuit control of composition, could only work when probe contacts to fuel gas and initial characteristic compensation time the two conditions enough;
Warning circuit is by an electric capacity C in described machine6With loudspeaker y compositions, electric capacity C6One end is connected on ic chip3Q ends, another termination loudspeaker y, the loudspeaker other end ground connection, work as IC3During work, loudspeaker sounding 1000Hz alarms;
The utility model also includes:
One with power supply and the joining initial characteristic compensation circuit of oscillating circuit being electronically activated, by ic chip4, two electric capacity C8、C110With resistance R5Composition;By ic chip4R,End andEnd and electric capacity C8, resistance R5Delay circuit is constituted, and electric visitor C is met in output end Q10Power supply disturbance is further filtered out, this circuit delay must could export DC voltage for 3~5 minutes to ic chip from being powered at its Q end3Power supply, the initial characteristic to compensate gas sensor QM;Ic chip4Vcc、Termination power positive pole, Q termination ic chips3VccEnd and electric capacity C10Anode, electric capacity C10The other end is grounded;
One with power supply and oscillating circuit joining protector control circuit being electronically activated, by bidirectional triode thyristor a BCR, two electricity visitor C7、C9, a resistance R6And two external connection end B1、B2Composition;Bidirectional triode thyristor BCR control poles G passes through electric capacity C7And ic chip3Q ends be connected, electric capacity C9And resistance R6Bidirectional triode thyristor BCR T is parallel to after being serially connected1、T2Two ends, T1End ground connection, T2Terminate external connection end B1, external connection end B2Connect AC power live wire;The power input and external connection end B of controlled protection electrical equipment (such as electric fan, smoke exhaust ventilator, electromagnet)2、B1It is connected, the oscillator signal when being alarmed in machine passes through electric visitor C7Triggering end G poles to bidirectional triode thyristor BCR turn on BCR, controlled electrical equipment energization work.Electric visitor C9, resistance R6For protecting bidirectional triode thyristor BCR.
The utility model has following features:
(1) in gas-power conversion circuit output end and triggering ic chip3'sOther circuits are not inserted between end, therefore, high to the monitoring sensitivity of combustible gas, reaction speed is fast;
(2) in power supply and triggering ic chip3VccBetween end, initial characteristic compensation circuit is inserted, initial characteristic is both compensate for, and do not influence sensitivity and the reaction speed of monitoring;The compensation time can arbitrarily adjust according to gas sensor, while not influenceing gas sensor condition of work;Make to have a power failure all without false alarm in just energization or use, be conducive to mixing up sensitivity by standard requirement during production, use is easier;
(3) diode D is sealed in after gas sensor and variable resistor W2, variable resistor W swing arms is transferred to smallest end, IC can be ensured3'sThere are 0.7V fundamental voltages at end, it is ensured that device normal work;
(4) protector control circuit, bidirectional triode thyristor output voltage is triggered without flip-flop with AC signal, is more beneficial for the inductive loads such as control ventilating fan, magnetic valve, smoke exhaust ventilator;Contactless using controllable silicon, no-spark is produced during break-make, it is to avoid when combustion gas reaches finite concentration.Start protector and produce electric spark, cause burning, blast etc. unexpected;
(5) sensitivity inspection can be set to adjust window, user can enter line sensitivity inspection tune according to product description oneself, be allowed to work in optimum state;
(6) simple in construction, small volume, cost are low.
Fig. 1 is the utility model circuit structure block diagram;
Fig. 2 is the utility model circuit structure diagram.
The utility model is further illustrated by embodiment below in conjunction with the accompanying drawings.
A kind of electronic gas monitor, including:By transformer B, diode D3~D5, electric capacity C1~C3, resistance R1, circuit of three-terminal voltage-stabilizing integrated IC1、IC2The power supply of composition, by gas sensor QM, diode D1, electric capacity C11, resistance R2Gas-power conversion circuit of composition, by variable resistor W, diode D2The signal detection of composition and sensitivity adjusting circuit, by ic chip3, resistance R3、R4, electric capacity C4、C5What is constituted is electronically activated oscillating circuit, by electric capacity C6, loudspeaker y composition machine in warning circuit, by bidirectional triode thyristor BCR, electric capacity C7、C9, resistance R6, external connection end B1、B2The defense controls circuit of composition, by ic chip4, electric capacity C8、C10, resistance R5The initial characteristic compensation circuit of composition;Circuit is equipped with the plastic casing that size is 105 × 75 × 50 in a printing version, and upper panel has nameplate, and the middle part left side is provided with power supply instruction D3, the right is provided with adjustment of sensitivity window, and loudspeaker playback window is arranged at bottom, and bottom right side is provided with fuel gas detection window etc..
In use, 220V50Hz mains supplies become 9V low tensions through transformer B decompressions, through diode D4(1A/100V), D5(1A/100V) rectification, electric capacity C1(1000 μ f/16V) is filtered, by resistance R1(2K), light emitting diode D3(LED) power supply instruction is constituted, by filtered low-voltage DC through circuit of three-terminal voltage-stabilizing integrated IC1After (model 7809) further voltage stabilizing, all the way through IC4(model NE555), electric capacity C8(100f), resistance R5After (1M) delay, ic chip is supplied3The V of (model NE555)ccWorking power is made at end, all the way through diode D1(2CP10) supplies the working power of gas sensor measuring electrode, another Lu Zaijing ic chips2(model 7805), electric capacity C2(100μf)、C3(0.1 μ f) further voltage stabilizing, filtering, through resistance R2Gas sensor heating electrode is supplied after (10 Ω) current limliting and makees heating power supply, gas sensor must possess the energy of the two power supplys supply, can just enter promoting the circulation of qi-electricity conversion.
By gas sensor QM, internal resistance and variable resistor W (4.7K), diode D2(2Cp10) constitutes divider, and exports d. c. voltage signal with variable resistor W swing arms, and sensitivity can be changed by changing swing arm position.Gas-electricity conversion regime is the change of gas sensor internal resistance, variable resistor W swing arm current potentials is changed, and variable resistor W swing arm and ic chip3'sEnd connects, and the potential change of swing arm will directly affect IC3Whether starting of oscillation, when gas sensor QM monitors certain density combustible gas, internal resistance declines rapidly, and W swing arm voltage will decline and rise with internal resistance, due to W swing arms and IC3'sEnd is connected, and swing arm voltage is exactlyTerminal voltage, when this voltage rises to Triggered Oscillation IC31/3 supply voltage when, by IC3, resistance R3(10K)、R4(100K), electric capacity C4(4700pf)、 C5The astatic multivibrator of (0.01 μ f) composition possesses condition of work and starting of oscillation, about 1KC (1000 weeks) audio signal is exported by Q ends, all the way through electric capacity C6(22 μ f/16), loudspeaker y alarm, all the way through electric capacity C7(22 μ f) gives the bidirectional triode thyristor BCR trigger signal voltage of G poles one, turns on bidirectional triode thyristor BCR, makes to be connected on output end B1Such as ventilating fan, magnetic valve it is controlled protection electrical equipment start working, automatic protection is realized, by electric capacity O9(01 μ f/400V), resistance R6The objective absorption circuit protection bidirectional triode thyristor BCR of (100 Ω) composition resistance.When gas sensor QM is in clean air, gas sensor QM internal resistances higher about 50K Ω, variable resistor W swing arm voltage are less than Triggered Oscillation IC31/3 supply voltage, i.e. 1/3Vcc, (W swing arms directly withIt is connected), oscillating circuit failure of oscillation, loudspeaker y is noiseless, and bidirectional triode thyristor BCR cut-offs, device is in monitoring state.
By ic chip4(NE555), electric capacity C8(100 μ f), resistance R5The initial characteristic compensation circuit of (1M) composition, one end couples with power supply, the other end (Q ends) and IC3Power end connection, to control Triggered Oscillation IC3Working power.Known by gas sensor initial characteristic:No matter fuel gas is whether there is, be initially powered 1~3 minute of gas sensor, internal resistance will decline, and then slowly go up in clean air, by 1~3 minute, can just go back up to normal operating conditions.After initial characteristic compensation circuit, the time delay of setting does not arrive, IC3It can not be worked due to no working power, regardless of gas sensor internal resistance,The voltage levels at end, device can not all work.When set time delay to when, caused by device is just only changed by gas sensor internal resistanceThe control of terminal voltage change.
Claims (1)
1. a kind of electronic gas monitor, couple including power supply, with power supply and gas-power conversion circuit containing gas sensor, couple with gas-power conversion circuit signal detection and sensitivity adjusting circuit, with signal detection and sensitivity adjusting circuit it is joining be electronically activated oscillating circuit, with warning circuit in the joining machine of oscillating circuit is electronically activated, it is characterised in that:
Described gas-power conversion circuit is by a gas sensor (QM), a diode (D1), a resistance (R2) and an electric capacity (C11) composition, diode (D1) anode connects positive source, negative electrode and connect gas sensor (QM) measuring electrode, resistance (R2) one end is grounded, another termination gas sensor (QM) heats electrode, electric capacity (C11) just terminating gas sensor (QM) measuring electrode output end (A), other end ground connection;
Described signal detection and sensitivity adjusting circuit are made up of a variable resistor (W) and a diode (D2), termination gas sensor (QM) the measuring electrode output ends of variable resistor W mono- (A), another terminating diode (D2) anode, swing arm meet integrated package (IC3)End, diode (D2) anode connects variable resistor (W), minus earth;
Described is electronically activated oscillating circuit by an integrated package (IC3), two resistance (R3)、(R4), two electric capacity (C4、C5) composition, by integrated package (IC3) (Vc、R, Q ') hold and (C5、R4、C4、R3) composition astatic multivibrator, and by (IC3) Q ends output machine in alarm signal and protector control circuit trigger signal;
Warning circuit is by an electric capacity (C in described machine6) and loudspeaker (y)Composition, electric capacity (C6) a termination integrated package (IC3) Q ends, another termination loudspeaker (y), loudspeaker (y) the other end ground connection;
Also include:
One with power supply and the joining initial characteristic compensation circuit of oscillating circuit being electronically activated, by integrated package (IC4), two electric capacity (C8、C10) and a resistance (R5) composition, by integrated package (IC4) R,VccEnd and electric capacity (C8), resistance (R5) composition delay circuit, integrated package (IC4) Vcc、Termination power positive pole, Q termination ic chips3VccEnd and electric capacity (C10) anode, electric capacity (C10) other end ground connection;
One with power supply and the joining protector of oscillating circuit being electronically activated controlling circuit, by a bidirectional triode thyristor (BCR), two electric capacity (C7、C9), a resistance (R6) and two external connection end (B1、B2) constitute, bidirectional triode thyristor (BCR) control pole passes through electric capacity (C7) and integrated (IC3) Q ends be connected, electric capacity (C9) and resistance (R6) be serially connected after be parallel to bidirectional triode thyristor (BCR) (T1、T2) two ends, T1End ground connection, T2Terminate external connection end B1, external connection end B2Connect AC power live wire.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 91214897 CN2103836U (en) | 1991-08-26 | 1991-08-26 | Electronic gas monitor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 91214897 CN2103836U (en) | 1991-08-26 | 1991-08-26 | Electronic gas monitor |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2103836U true CN2103836U (en) | 1992-05-06 |
Family
ID=4923045
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 91214897 Granted CN2103836U (en) | 1991-08-26 | 1991-08-26 | Electronic gas monitor |
Country Status (1)
Country | Link |
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CN (1) | CN2103836U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102897196A (en) * | 2012-11-05 | 2013-01-30 | 蔡方舟 | Method and device for preventing subway train from running after objects are clamped between door of subway train and platform screen door |
CN105006094A (en) * | 2015-07-13 | 2015-10-28 | 苏州经贸职业技术学院 | Simple smoke alarm low in false alarm rate |
-
1991
- 1991-08-26 CN CN 91214897 patent/CN2103836U/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102897196A (en) * | 2012-11-05 | 2013-01-30 | 蔡方舟 | Method and device for preventing subway train from running after objects are clamped between door of subway train and platform screen door |
CN105006094A (en) * | 2015-07-13 | 2015-10-28 | 苏州经贸职业技术学院 | Simple smoke alarm low in false alarm rate |
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Legal Events
Date | Code | Title | Description |
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C06 | Publication | ||
PB01 | Publication | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |