CN202871031U - Simple toxic gas warning device - Google Patents
Simple toxic gas warning device Download PDFInfo
- Publication number
- CN202871031U CN202871031U CN 201220478090 CN201220478090U CN202871031U CN 202871031 U CN202871031 U CN 202871031U CN 201220478090 CN201220478090 CN 201220478090 CN 201220478090 U CN201220478090 U CN 201220478090U CN 202871031 U CN202871031 U CN 202871031U
- Authority
- CN
- China
- Prior art keywords
- triode
- resistance
- control chip
- gas sensor
- potentiometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Alarm Devices (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The utility model discloses a simple toxic gas warning device including a DC power source, a gas 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. When toxic gas is detected by the gas sensor, a resistance value decreases sharply, current of the potentiometer increases, the second capacitor charges, the first triode and the second triode are both connected, negative electrode power source is connected since resistance between a base electrode and a collector electrode of the second triode is decreased, the audio frequency control chip starts to work, so that the loudspeaker is made to give out sound warnings. Components and parts adopted in the utility model are comparatively less, the cost is low and the size is comparatively small. The simple toxic gas warning device can be widely applied to household detection of harmful gases such as coal gas, carbon monoxide, methane, propane and the like. When concentration of the harmful gases reaches to a certain degree, warning signals are given out to remind people to handle potential safety hazards.
Description
Technical field
The utility model relates to a kind of warning device, relates in particular to a kind of easy toxic gas alarm device.
Background technology
Toxic air alarm device 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 the sensing chamber, it is the important instrument that guarantees production and personal safety.When tested place had poisonous gas, 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 toxic gas lower explosive limit.The sound and light alarm signal prompt occurs when concentration of toxic gases surpasses alarm setting value, and the operator on duty in time takes safety measures, and avoids blast accident to occur.
Toxic gas alarm 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 the family and use.
Summary of the invention
The purpose of this utility model provides a kind of easy toxic gas alarm device 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 while of described direct supply 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 of described audio control chip concussion end 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, and 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, when harmful gas acquires a certain degree, send alerting signal, 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 while of direct supply 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, 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 of audio control chip IC concussion end QS1 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, and 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 (such as carbon monoxide, liquefied gas, methane and propane etc.) or concentration in the 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 equal conducting of the second 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 arrive 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. easy toxic gas alarm device, it 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 while of described direct supply 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 of described audio control chip concussion end 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, and the collector of described the 3rd triode is connected with the second end of described loudspeaker.
2. easy toxic gas alarm device 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 201220478090 CN202871031U (en) | 2012-09-19 | 2012-09-19 | Simple toxic gas warning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220478090 CN202871031U (en) | 2012-09-19 | 2012-09-19 | Simple toxic gas warning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202871031U true CN202871031U (en) | 2013-04-10 |
Family
ID=48037729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220478090 Expired - Fee Related CN202871031U (en) | 2012-09-19 | 2012-09-19 | Simple toxic gas warning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202871031U (en) |
Cited By (3)
| 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 |
| CN104252768A (en) * | 2013-06-25 | 2014-12-31 | 成都旋极历通信息技术有限公司 | Harmful gas alarm device for airplane storage room |
| CN107642379A (en) * | 2017-08-22 | 2018-01-30 | 西安科技大学 | A kind of Management Information System for Coal Mine Safety |
-
2012
- 2012-09-19 CN CN 201220478090 patent/CN202871031U/en not_active Expired - Fee Related
Cited By (3)
| 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 |
| CN104252768A (en) * | 2013-06-25 | 2014-12-31 | 成都旋极历通信息技术有限公司 | Harmful gas alarm device for airplane storage room |
| CN107642379A (en) * | 2017-08-22 | 2018-01-30 | 西安科技大学 | A kind of Management Information System for Coal Mine Safety |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103293280B (en) | A kind of gas testing device | |
| CN202871031U (en) | Simple toxic gas warning device | |
| CN101975804A (en) | Semiconductor gas sensor and temperature compensation method | |
| CN202995976U (en) | Harmful gas leakage alarm | |
| CN206349592U (en) | A kind of multifunction wiring board | |
| CN103810819A (en) | Harmful gas leakage warner | |
| CN202331724U (en) | Detector for hazardous gas | |
| CN102384360B (en) | Mine lamp with functions of displaying carbon monoxide concentration in digitized way, detecting carbon monoxide concentration and alarming | |
| CN103440736B (en) | general toxic gas alarm device | |
| CN202994711U (en) | Gas measurement warning device based on singlechip | |
| CN202093009U (en) | Intelligent toxic and harmful gas detector | |
| CN204833620U (en) | Gas leakage alarm device | |
| CN106290089A (en) | A kind of high-precision miniaturization particulate matter sensors | |
| CN201935890U (en) | toxic gas alarm circuit | |
| CN201111689Y (en) | Combustible gas alarm | |
| CN104835283A (en) | Smoke alarm | |
| CN203465183U (en) | Gas measuring device, voltage stabilizing circuit and gas calibration device | |
| CN201518011U (en) | Gas sensor harmful gas detector | |
| CN204632040U (en) | Smoke alarm | |
| CN107749149A (en) | A kind of detection alarm for being used for flammable toxic gas in environment | |
| CN102682579A (en) | Intelligent memory type gas leakage alarming control device | |
| CN203982546U (en) | A kind of suction-type coal gas leakage detection instrument | |
| CN203606338U (en) | Inspection well gas measurement device with Bluetooth | |
| CN207352751U (en) | A kind of detection alarm for being used for flammable toxic gas in environment | |
| CN203310742U (en) | Gas calibration device |
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: 20130410 Termination date: 20130919 |