CN201465266U - Fuel gas leakage alarm - Google Patents
Fuel gas leakage alarm Download PDFInfo
- Publication number
- CN201465266U CN201465266U CN2009201100834U CN200920110083U CN201465266U CN 201465266 U CN201465266 U CN 201465266U CN 2009201100834 U CN2009201100834 U CN 2009201100834U CN 200920110083 U CN200920110083 U CN 200920110083U CN 201465266 U CN201465266 U CN 201465266U
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Abstract
The utility model relates to a fuel gas leakage alarm, which belongs to the field of safe detection of fuel gas, and comprises a power supply circuit, an air-sensitive detector, a comparison circuit, a multiresonant circuit and an acousto-optic indicating circuit, a fuel gas sensor is utilized to detect leakage of gas, and converses voltage variation. The acousto-optic electric alarm circuit is controlled through comparison circuits, limiting amplitude circuits and the like. When fuel gas is leaked, the fuel gas leakage alarm indicates users to take measures for preventing accidents. Threshold can be flexibly arranged according to the use condition, the adjustment is flexible, and the precision is higher.
Description
Technical field
The utility model relates to combustible gas leakage alarm, belongs to inflammable gas safety detection field.
Background technology
Along with improving constantly of people's living standard, coal gas, rock gas, petroleum gas etc. use widely in family, because exist to be interrupted air feed, to use improper storage and pipeline, the factor of aspects such as combustion gas tool leakage, cause accidents such as fire, blast, poisoning be dead constantly to take place.So combustion gas is revealed warning device and is arisen at the historic moment, but can only can't regulate, thereby accommodation being narrower at one or two kind of gas alarm of having of present combustion gas leakage alarm; The interference that is subjected to the various assorted gas of smog and kitchen that has and produce malfunction or the air-sensitive detecting element is contaminated by smoke and malfunctioning attonity; Though what have has a jamming-proof temperature-compensation circuit, the circuit complexity increases failure rate, in fact fail to reach the purpose that reduces misoperation, and cost is higher; What have is integrated with kitchen range, costs an arm and a leg, and user's replacement cost is too high, is not easy to promote.
The utility model content
The purpose of this utility model is: the comparator circuit that adopts the operational amplifier design improves the reliability of combustible gas leakage alarm as testing circuit, and alarm circuit is simplified, and reduces the alarm cost.
To achieve these goals, the utility model has been taked following technical scheme: combustible gas leakage alarm, comprise power circuit, gas sensitive detector, comparator circuit, multi-resonant oscillating circuit and acousto-optic indicating circuit, it is characterized in that: described power circuit is by transformer T, commutation diode D1-D8, and three terminal regulator IC1, IC2 and filter capacitor C1, C2, C4, C5 form, produce positive and negative low-voltage dc power supply.Transformer T is converted into the low-voltage AC that two-way voltage equates with civil power, the two-way low-voltage AC is converted into positive and negative two-way low-voltage DC through two groups of full bridge rectifiers that are made of commutation diode D1-D4 and commutation diode D5-D8 respectively, the two-way low-voltage DC is respectively by meeting three terminal regulator IC1, IC2 respectively after filter capacitor C1, the C4 filtering, the output of three terminal regulator IC1, IC2 is again through filter capacitor C2, C5 filtering, the negative pole of one road low-voltage DC is connected with the positive pole of another road low-voltage DC as ground, forms positive and negative low-voltage dc power supply.Described gas sensitive detector is made up of gas sensor and resistance R 1 and potentiometer W1, be connected between positive source and the ground behind filament the two poles of the earth series resistor R1 of gas sensor, the positive pole of gas sensor test side connects positive source, connects the ground of power supply behind the negative pole serial connection potentiometer W1 of gas sensor test side.The buckle closure that filter membrane covers wherein is housed on the detecting head of gas sensor, and filter membrane is replaceable.Described comparator circuit is by operational amplifier IC3A, IC3B and resistance R 2, R3, R4, potentiometer W2 constitutes, wherein operational amplifier IC3A is connected into voltage follower, the input of voltage follower connects the adjustable side of potentiometer W1 in the gas sensitive detector, the output of voltage follower connects the in-phase input end of operational amplifier IC3B through resistance R 4, the inverting input of operational amplifier IC3B connects the adjustable side of potentiometer W2 after resistance R 3, potentiometer W2 be connected in series with resistance R 2 and positive source and ground between, positive source connecting resistance R2, meet potentiometer W2 power supply, meet bi-directional voltage stabilizing pipe D between the output terminal of operational amplifier IC3B and the power supply ground
zDescribed multi-resonant oscillating circuit is made of IC4 and resistance R 5, R6 and capacitor C 6, C7, wherein IC4 is the NE555 chip, 8 pin of NE555 chip connect positive source, 8 pin and 7 pin indirect resistance R5,7 pin and 6 pin indirect resistance R6,6 pin and 2 foots connect, 2 foot meridian capacitor C6 ground connection, 5 foot meridian capacitor C7 ground connection, 1 pin ground connection, 4 pin connect the output terminal of operational amplifier IC3B.Described acousto-optic indicating circuit comprises dichromatic LED LED and loudspeaker Y, and dichromatic LED LED is connected between the output of the output of voltage follower and operational amplifier IC3B, and loudspeaker Y is connected between 3 pin and power supply ground of NE555 chip.
Described gas sensor adopts QM-N10, and described positive and negative low-voltage dc power supply is ± 15V bi-directional voltage stabilizing pipe D
zAdopt IN4735.
Described filter membrane is qualitative filter paper or nonwoven fabrics.
Compare with existing combustion gas body leakage alarm, the utlity model has following advantage:
1) adopts operational amplifier design integrated circuit, overcome the influence that temperature drift brings, avoid false-alarm.
2) adopt comparator circuit as testing circuit, can thresholding be set flexibly according to operating position, adjust flexibly, precision is higher.
3) adopt 555 timing circuits to realize the multi resonant oscillating circuit, can drive loudspeaker, the warning effect is better.
4) adopt homemade power circuit, can insert civil power and detect use for a long time.
5) the air-sensitive detector has the filter membrane buckle closure, can prevent the pollution of oil smoke to probe, avoids wrong report and malfunctioning.
Description of drawings
Fig. 1 is the combustible gas leakage alarm circuit theory diagrams.
Among the figure, 1, power circuit, 2, gas sensitive detector, 3, comparator circuit, 4, multi-resonant oscillating circuit, 5, the acousto-optic indicating circuit.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated:
As shown in Figure 1, this device is made up of power circuit, gas sensitive detector, comparator circuit, multi-resonant oscillating circuit and acousto-optic indicating circuit.
Power circuit is by transformer T, commutation diode D1-D8, and three terminal regulator IC1, IC2 and filter capacitor C1, C2, C4, C5 form.Power circuit generation ± 15V DC voltage.Gas sensitive detector is made up of special gas sensor QM-N10.IC3A, IC3B and resistance R 2, R3, R4, potentiometer W2 constitutes comparer, wherein, IC3A is voltage follower, is mainly comparer certain electric current is provided.IC3B is a homophase input threshold comparer.D
zBe the bi-directional voltage stabilizing pipe, burning voltage is ± 6V, its objective is the voltage limit of comparer output in ± 6V.LED is a dichromatic LED, plays indicative function.IC4 and R5, R6, C6, C7 constitute the multi resonant oscillator.Y is a loudspeaker, plays the audible alarm effect.
When no gas leakage, air-sensitive detecting element A, B point-to-point transmission resistance are very high, and about tens kilohms, therefore, the voltage of getting on the W1 potentiometer is lower, this voltage is delivered to the in-phase end of voltage comparator through voltage follower IC3A, with the input voltage of end of oppisite phase W2 relatively because the input voltage of in-phase end is less than the setting voltage of end of oppisite phase, comparer is output as-the 6V voltage signal, therefore, the green indicating lamp of light emitting diode is bright, represents no gas leakage.Simultaneously, comparer output-6V voltage is added to the 4th pin of multi resonant oscillator, makes multi resonant oscillator failure of oscillation, and loudspeaker is noiseless, represents no gas leakage.
When gas leakage, gas sensor A, B point-to-point transmission resistance are lower, about hundreds of ohm, therefore, the voltage of getting on the W1 potentiometer is higher, this voltage is delivered to the in-phase input end of voltage comparator through voltage follower IC3A, with the input voltage of end of oppisite phase W2 relatively because the input voltage of in-phase end is greater than the setting voltage of end of oppisite phase, comparer is output as+voltage signal of 6V, therefore, the light emitting diode red led is bright, and expression has gas leakage.Simultaneously, comparer output+6V voltage is added to the 4th pin of multi resonant oscillator, makes the starting of oscillation of multi resonant oscillator, the loudspeaker sounding, and expression has gas leakage.
Selection of components
T1: power step-down transformer, specification: 220V/22V, 3-5W
D1-D8: diode, model: IN4004
IC1: three terminal regulator, model: W7815
IC2: three terminal regulator, model: W7915
IC3A, IC3B: operational amplifier, model: LM314
IC4: time-base integrated circuit, model: NE555
R1：4.7Ω；W1：4.7kΩ；R2：10kΩ；W2：10kΩ；R3：10kΩ；R4：10kΩ；
R5：5.1kΩ；R6：100kΩ；
C1：1000μF/25V；C2：1μF/25V；C3：0.01μF；C4：1000μF/25V；
C5：1μF/25V；C6：0.01μF；C7：0.01μF；C8：1000μF
LED: variable color light emitting diode, model: 2EF303
Y: loudspeaker, specification: 8 Ω/0.5W
Gas sensitive detector: QM-N10
D
z: bi-directional voltage stabilizing pipe, model: IN4735
Embodiment
All elements are contained on the P.e.c., are fixed in the plastic casing.Make a call to a circular hole in the plastic casing side, gas sensitive detector is drawn from circular hole.During debugging, plug inserts the 220V civil power, puts near the gas-cooker, opens gas-cooker, and allows combustion gas fully burn, and at this moment the dichromatic LED green light is lighted, and loudspeaker is sounding not.Then, gas-cooker is opened, made it not burn, after several seconds, the dichromatic LED red colored lamp is lighted excessively, and simultaneously, loudspeaker sends " pouting ... pout " alarm sound.If above-mentioned situation do not occur, can adjust W1 and W2 and make the circuit operate as normal.
Making the buckle closure of tubbiness according to the shape of gas sensitive detector detecting head, be empty in the middle of the buckle closure, covers the cavity in buckle closure inside with filter paper.Filter paper can be used qualitative filter paper, also can be with culinary anti-greasy filth nonwoven fabrics.Buckle closure is buckled on the detecting head of gas sensitive detector periodic replacement filter paper or buckle closure.
Claims (3)
1. combustible gas leakage alarm, comprise power circuit, gas sensitive detector, comparator circuit, multi-resonant oscillating circuit and acousto-optic indicating circuit, it is characterized in that: described power circuit is by transformer T, commutation diode D1-D8, and three terminal regulator IC1, IC2 and filter capacitor C1, C2, C4, C5 forms, transformer T is converted into the low-voltage AC that two-way voltage equates with civil power, the two-way low-voltage AC is converted into positive and negative two-way low-voltage DC through two groups of full bridge rectifiers that are made of commutation diode D1-D4 and commutation diode D5-D8 respectively, the two-way low-voltage DC is respectively by filter capacitor C1, meet three terminal regulator IC1 after the C4 filtering respectively, IC2, three terminal regulator IC1, the output of IC2 is again through filter capacitor C2, C5 filtering, the negative pole of one road low-voltage DC is connected with the positive pole of another road low-voltage DC as ground, forms positive and negative low-voltage dc power supply; Described gas sensitive detector is made up of gas sensor and resistance R 1 and potentiometer W1, be connected between positive source and the ground behind filament the two poles of the earth series resistor R1 of gas sensor, the positive pole of gas sensor test side connects positive source, connect the ground of power supply behind the negative pole serial connection potentiometer W1 of gas sensor test side, the buckle closure that filter membrane covers is housed, and filter membrane is replaceable on the detecting head of gas sensor; Described comparator circuit is by operational amplifier IC3A, IC3B and resistance R 2, R3, R4, potentiometer W2 constitutes, wherein operational amplifier IC3A is connected into voltage follower, the input of voltage follower connects the adjustable side of potentiometer W1 in the gas sensitive detector, the output of voltage follower connects the in-phase input end of operational amplifier IC3B through resistance R 4, the inverting input of operational amplifier IC3B connects the adjustable side of potentiometer W2 after resistance R 3, potentiometer W2 and resistance R 2 are serially connected with between positive source and the ground, positive source connecting resistance R2, meet potentiometer W2 power supply, meet bi-directional voltage stabilizing pipe D between the output terminal of operational amplifier IC3B and the power supply ground
ZDescribed multi-resonant oscillating circuit is made of IC4 and resistance R 5, R6 and capacitor C 6, C7, wherein IC4 is the NE555 chip, 8 pin of NE555 chip connect positive source, 8 pin and 7 pin indirect resistance R5,7 pin and 6 pin indirect resistance R6,6 pin and 2 foots connect, 2 foot meridian capacitor C6 ground connection, 5 foot meridian capacitor C7 ground connection, 1 pin ground connection, 4 pin connect the output terminal of operational amplifier IC3B; Described acousto-optic indicating circuit comprises dichromatic LED LED and loudspeaker Y, and dichromatic LED LED is connected between the output of the output of voltage follower and operational amplifier IC3B, and loudspeaker Y is connected between 3 pin and power supply ground of NE555 chip.
2. combustible gas leakage alarm as claimed in claim 1 is characterized in that: described gas sensor adopts QM-N10, and described positive and negative low-voltage dc power supply is ± 15V bi-directional voltage stabilizing pipe D
ZAdopt IN4735.
3. combustible gas leakage alarm as claimed in claim 1 or 2 is characterized in that: described filter membrane is qualitative filter paper or nonwoven fabrics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201100834U CN201465266U (en) | 2009-07-16 | 2009-07-16 | Fuel gas leakage alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201100834U CN201465266U (en) | 2009-07-16 | 2009-07-16 | Fuel gas leakage alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201465266U true CN201465266U (en) | 2010-05-12 |
Family
ID=42392614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201100834U Expired - Lifetime CN201465266U (en) | 2009-07-16 | 2009-07-16 | Fuel gas leakage alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201465266U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093136A (en) * | 2016-06-06 | 2016-11-09 | 深圳市谷粒科技有限公司 | A kind of application algorithm of semiconductor gas sensor |
| CN106991796A (en) * | 2017-05-17 | 2017-07-28 | 广西南宁卓耀电子科技有限公司 | A kind of combustible gas alarm circuit |
| CN109115840A (en) * | 2018-07-12 | 2019-01-01 | 赵秀卿 | Single line carrier type space tester |
-
2009
- 2009-07-16 CN CN2009201100834U patent/CN201465266U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093136A (en) * | 2016-06-06 | 2016-11-09 | 深圳市谷粒科技有限公司 | A kind of application algorithm of semiconductor gas sensor |
| CN106093136B (en) * | 2016-06-06 | 2019-09-17 | 深圳市谷粒科技有限公司 | A kind of processing method of semiconductor gas sensor |
| CN106991796A (en) * | 2017-05-17 | 2017-07-28 | 广西南宁卓耀电子科技有限公司 | A kind of combustible gas alarm circuit |
| CN109115840A (en) * | 2018-07-12 | 2019-01-01 | 赵秀卿 | Single line carrier type space tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100512 Effective date of abandoning: 20090716 |