CN202995976U - Harmful gas leakage alarm - Google Patents
Harmful gas leakage alarm Download PDFInfo
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- CN202995976U CN202995976U CN 201220600481 CN201220600481U CN202995976U CN 202995976 U CN202995976 U CN 202995976U CN 201220600481 CN201220600481 CN 201220600481 CN 201220600481 U CN201220600481 U CN 201220600481U CN 202995976 U CN202995976 U CN 202995976U
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- triode
- resistance
- control chip
- gas
- potentiometer
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Abstract
The present utility model discloses a harmful gas leakage alarm. The alarm comprises a DC power supply, a gas-sensitive sensor, a potentiometer, an audio frequency control chip, a loudspeaker, a first triode, a second triode, a third triode, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor and a diode. If toxic gas is detected by the gas-sensitive sensor, the resistance decreases rapidly, the current of the potentiometer increases, the second capacitor is charged, the first triode and the second triode are all conducted, the resistance between a base electrode and a collector electrode of the second triode decreases, thus a cathode power supply is connected, the audio frequency control chip is started to work, and a sounding alarm is given out by the loudspeaker. The number of adopted components is small, costs are low, the volume is small, the alarm can be widely used for detecting household gas, carbon monoxide, methane, propane and other harmful gases, an alarm signal is given out when the harmful gas reaches a certain extent, and people can prompted to process hidden troubles.
Description
Technical field
The utility model relates to a kind of warning device, relates in particular to a kind of poisonous gas leakage alarm.
Background technology
Warning device to harmful gas is made of detector and controlling alarm main frame, be widely used in the petroleum chemical industry that oil, combustion gas, chemical industry, oil depot etc. have poisonous gas, in order to the leakage situation of hazardous area inside and outside sensing chamber, it is the important instrument that guarantees production and personal safety.When there was harmful gas in tested place, detector converts the gas signal to voltage signal or current signal is sent to alarming instrument, and instrument display goes out the percent concentration value of harmful gas lower explosive limit.The sound and light alarm signal prompt occurs when harmful gas concentration surpasses alarm setting value, and the operator on duty in time takes safety measures, and avoids blast accident to occur.
Harmful gas warning device complex structure of the prior art adopts components and parts more, and volume is large, mostly is used for chemical industry, and expensive, can't spread in family and use.
Summary of the invention
The purpose of this utility model provides a kind of poisonous gas leakage alarm with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
the utility model comprises direct supply, gas sensor, potentiometer, audio control chip, loudspeaker, the first triode, the second triode, the 3rd triode, the first electric capacity, the second electric capacity, the first resistance, the second resistance, the 3rd resistance and diode, the anodal while of described direct supply and the first end of described gas sensor, the first end of described gas sensor internal resistance silk, the collector of described the first triode, the electrode input end of described audio control chip be connected the first end of loudspeaker and connect, the negative pole of described direct supply is simultaneously and the first end of described the first resistance, the negative pole of described diode, the first end of described the first electric capacity, the first end of described the second electric capacity, the emitter of described the second triode be connected the emitter of the 3rd triode and connect, the second end of described the first resistance is connected with the second end of the resistance wire of described gas sensor inside, the second end while of described gas sensor and the first end of described potentiometer, the sliding end of described potentiometer, the second end of described the first electric capacity be connected the first end of the second resistance and connect, the second end of described potentiometer is connected with the positive pole of described diode, the second end of described the second resistance simultaneously with the base stage of described the first triode be connected the second end of the second electric capacity and be connected, the emitter of described the first triode is connected with the base stage of described the second triode, the collector of described the second triode is connected with the negative pole end of described audio control chip, the first audio frequency concussion end of described audio control chip and the audio frequency concussion of being connected are held and are connected with the two ends of described the 3rd resistance respectively, the audio signal output end of described audio control chip is connected with the base stage of described the 3rd triode, the collector of described the 3rd triode is connected with the second end of described loudspeaker.
Particularly, described the first triode, described the second triode and described the 3rd triode are NPN type triode.
The beneficial effects of the utility model are:
The components and parts that the utility model adopts are less, with low cost, small volume can be widely used in family and detect the harmful gases such as coal gas, carbon monoxide, methane, propane, send alerting signal when harmful gas acquires a certain degree, remind people to process potential safety hazard.
Description of drawings
Fig. 1 is circuit structure schematic diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
as shown in Figure 1: the utility model comprises direct supply, gas sensor QM, potentiometer RP, audio control chip IC, loudspeaker Y, the first triode VT1, the second triode VT2, the 3rd triode VT3, the first capacitor C 1, the second capacitor C 2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and diode VD, the anodal while of direct supply and the first end of gas sensor QM, the first end of gas sensor QM internal resistance silk, the collector of the first triode VT1, the electrode input end VDD of audio control chip IC is connected first end and is connected with loudspeaker Y, the negative pole of direct supply simultaneously and the first end of the first resistance R 1, the negative pole of diode VD, the first end of the first capacitor C 1, the first end of the second capacitor C 2, the emitter of the emitter of the second triode VT2 and the 3rd triode VT3 connects, and the second end of the first resistance R 1 is connected with the second end of the resistance wire of gas sensor QM inside, the second end while of gas sensor QM and the first end of potentiometer RP, the sliding end of potentiometer RP, the second end of the first capacitor C 1 be connected the first end of resistance R 2 and connect, the second end of potentiometer RP is connected with the positive pole of diode VD, the second end of the second resistance R 2 simultaneously with the base stage of the first triode VT1 be connected the second end of capacitor C 2 and be connected, the emitter of the first triode VT1 is connected with the base stage of the second triode VT2, the collector of the second triode VT3 is connected with the negative pole end VCC of audio control chip IC, the first audio frequency concussion end QS1 of audio control chip IC be connected audio frequency concussion end QS2 and be connected with the two ends of the 3rd resistance R 3 respectively, the audio signal output end of audio control chip IC is connected with the base stage of the 3rd triode VT3, the collector of the 3rd triode VT3 is connected with the second end of loudspeaker Y.The first triode VT1, the second triode VT2 and the 3rd triode VT3 are NPN type triode.
As shown in Figure 1: gas sensor QM is the N-type semiconductor element, is a kind of low-power consumption, highly sensitive gas sensor, and its inside has-individual heater strip and a pair of exploring electrode.When not containing toxic gas (as carbon monoxide, liquefied gas, methane and propane etc.) or concentration in air when very low, the resistance of gas sensor QM is very large, the electric current that flows through potentiometer RP is very little, the first triode VT1 and the second triode VT2 all are in the strong attitude of cut-off, audio control chip IC is the chip of model KD9561, because the resistance of negative electricity source VCC is larger, warning circuit is not worked, and loudspeaker Y is sounding not; If the concentration of toxic gas is increased to certain value, the resistance of gas sensor QM sharply descends, the electric current that flows through potentiometer RP increases sharply, the second capacitor C 2 begins charging, and the current potential of the first triode VT1 base stage rises, when reaching the conducting current potential of the first triode VT1, the first triode VT1 and the second equal conducting of triode VT2, the base stage of the second triode and the resistance decreasing of inter-collector make VCC connect negative power supply, and audio control chip IC starts working, and impels loudspeaker Y sounding alarm.When the concentration of toxic gas descended and arrives certain value, the second capacitor C 2 was by the second resistance R 2, potentiometer RP and diode VD discharge, and the base potential of the first triode begins to descend.Last the first triode VT1 and the second triode VT2 come back to cut-off state, and audio control chip IC quits work, and loudspeaker Y stops sounding.
In foregoing circuit, regulator potentiometer RP can regulate the sensitivity of warning, the 3rd triode VT3 amplifies the alarm sound signal, thereby drive loudspeaker and send alarm sound, the value that changes the 3rd resistance R 3 can change the oscillation frequency of audio control chip IC inside, thereby changes the dullness of alarm sound.If change gas sensor QM into light activated element or humidity-sensitive element etc., other element need not change, and can directly repack light control alarm circuit and humidity alarm circuit etc. into.
Claims (2)
1. a poisonous gas leakage alarm, is characterized in that: comprise direct supply, gas sensor, potentiometer, audio control chip, loudspeaker, the first triode, the second triode, the 3rd triode, the first electric capacity, the second electric capacity, the first resistance, the second resistance, the 3rd resistance and diode, the anodal while of described direct supply and the first end of described gas sensor, the first end of described gas sensor internal resistance silk, the collector of described the first triode, the electrode input end of described audio control chip be connected the first end of loudspeaker and connect, the negative pole of described direct supply is simultaneously and the first end of described the first resistance, the negative pole of described diode, the first end of described the first electric capacity, the first end of described the second electric capacity, the emitter of described the second triode be connected the emitter of the 3rd triode and connect, the second end of described the first resistance is connected with the second end of the resistance wire of described gas sensor inside, the second end while of described gas sensor and the first end of described potentiometer, the sliding end of described potentiometer, the second end of described the first electric capacity be connected the first end of the second resistance and connect, the second end of described potentiometer is connected with the positive pole of described diode, the second end of described the second resistance simultaneously with the base stage of described the first triode be connected the second end of the second electric capacity and be connected, the emitter of described the first triode is connected with the base stage of described the second triode, the collector of described the second triode is connected with the negative pole end of described audio control chip, the first audio frequency concussion end of described audio control chip and the audio frequency concussion of being connected are held and are connected with the two ends of described the 3rd resistance respectively, the audio signal output end of described audio control chip is connected with the base stage of described the 3rd triode, the collector of described the 3rd triode is connected with the second end of described loudspeaker.
2. poisonous gas leakage alarm according to claim 1, it is characterized in that: described the first triode, described the second triode and described the 3rd triode are NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220600481 CN202995976U (en) | 2012-11-15 | 2012-11-15 | Harmful gas leakage alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220600481 CN202995976U (en) | 2012-11-15 | 2012-11-15 | Harmful gas leakage alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202995976U true CN202995976U (en) | 2013-06-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220600481 Expired - Fee Related CN202995976U (en) | 2012-11-15 | 2012-11-15 | Harmful gas leakage alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202995976U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810819A (en) * | 2012-11-15 | 2014-05-21 | 成都万维图新信息技术有限公司 | Harmful gas leakage warner |
| CN103886721A (en) * | 2014-03-28 | 2014-06-25 | 卫斌鹏 | Domestic coalbed methane leakage alarming device |
-
2012
- 2012-11-15 CN CN 201220600481 patent/CN202995976U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810819A (en) * | 2012-11-15 | 2014-05-21 | 成都万维图新信息技术有限公司 | Harmful gas leakage warner |
| CN103886721A (en) * | 2014-03-28 | 2014-06-25 | 卫斌鹏 | Domestic coalbed methane leakage alarming device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20131115 |