CN203405902U - Smoke alarm - Google Patents
Smoke alarm Download PDFInfo
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- CN203405902U CN203405902U CN201320373888.4U CN201320373888U CN203405902U CN 203405902 U CN203405902 U CN 203405902U CN 201320373888 U CN201320373888 U CN 201320373888U CN 203405902 U CN203405902 U CN 203405902U
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- resistance
- diode
- transformer
- triode
- smoke alarm
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Abstract
A smoke alarm comprises a transformer, a gas sensor, a first resistor, a first diode, a second resistor, a first triode, a bidirectional thyristor and a speaker, wherein the output end of the transformer is connected with the input end of the gas sensor, the output end of the gas sensor is connected with one end of the first resistor, the other end of the first resistor is connected with the anode end of the first diode, the cathode end of the first diode is connected with one end of the second resistor, the other end of the second resistor is connected with the base electrode of the first triode, the collection electrode of the first triode is connected with the output end of the transformer by a bias resistor, the emitter electrode of the first triode is connected with one end of the bidirectional thyristor, the other end of the bidirectional thyristor is connected with one end of the speaker, and the other end of the speaker is connected with the output end of the transformer. The smoke alarm can timely alarm when the combustible gas is generated.
Description
Technical field
The utility model relates to a kind of smoke alarm.
Background technology
Along with the increase of fire, power consumption for Modern Family, the frequency that family fire occurs is more and more higher.Once family fire occurs, be easy to occur putting out a fire to save life and property not in time, fire distinguisher lacks and people on the scene is panic, the unfavorable factor such as slow of escaping, and finally causes great life and property loss.The main cause of family fire is off one's guard, does not take preventive measures in time.The statistics demonstration of fire department, in all fire ratios, family fire has accounted for 30% left and right of national fire.The reason diversity that family is on fire, may note the place obtaining at us, also may just be hidden in we basic just note less than place.So fire prevention is the problem that each family must note constantly.If can take in advance simple fire prevention measure according to the actual conditions of every family, some tragedies are completely avoidable.
Summary of the invention
For above-mentioned technical matters, fundamental purpose of the present utility model is, provide a kind of when there is inflammable gas can and the smoke alarm of alarm.
Smoke alarm, comprise transformer, gas sensor, the first resistance, the first diode, the second resistance, the first triode, bidirectional thyristor and loudspeaker, the output terminal of transformer is connected with the input end of gas sensor, the output terminal of gas sensor is connected with one end of the first resistance, the other end of the first resistance is connected with the anode tap of the first diode, the cathode terminal of the first diode is connected with one end of the second resistance, the other end of the second resistance is connected with the base stage of the first triode, the collector of the first triode is connected with the output terminal of transformer by a biasing resistor, the first transistor emitter is connected with one end of bidirectional thyristor, one end that the other end of bidirectional thyristor is connected with loudspeaker connects, the other end of loudspeaker is connected with the output terminal of transformer.
Further, also comprise that first electric capacity and is with the 3rd resistance, one end of the first electric capacity is connected with the cathode terminal of the first diode, the other end ground connection of the first electric capacity, one end of the 3rd resistance is connected with the base stage of the first triode, the other end ground connection of the 3rd resistance.
Further, also comprise second diode and the second electric capacity, the second diode is connected between described biasing resistor and the output terminal of transformer, and one end of described the second electric capacity is connected with the cathode terminal of the second diode, the other end ground connection of the second electric capacity.
Further, also comprise a light emitting diode, this light emitting diode is connected in parallel on the two ends of loudspeaker.
Further, described the first resistance is slide rheostat.
Adopted such scheme, while there is inflammable gas in environment, the electricity of gas sensor is led increase, by the first resistance, take out voltage, voltage flow to the first triode through the first diode and the second resistance, the first triode conducting, make also conducting of bidirectional thyristor, thereby after the loudspeaker acquisition drive current that makes to connect with bidirectional thyristor, work, produce the sound of high-decibel, realize and reporting to the police.After inflammable gas disappears, circuit returns to virgin state, reports to the police and automatically stops.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present utility model;
Embodiment
With reference to Fig. 1, a kind of smoke alarm of the present utility model, comprises transformer T1, gas sensor M, the first resistance R 1, the first diode D1, the second resistance R 2, the first triode Q1, bidirectional thyristor Q2 and loudspeaker Y.The output terminal of transformer T1 is connected with the input end of gas sensing M device, the output terminal of gas sensor M is connected with one end of the first resistance R 1, the first resistance R 1 is slide rheostat, the other end of the first resistance R 1 is connected with the anode tap of the first diode D1, the cathode terminal of the first diode D1 is connected with one end of the second resistance R 2, the other end of the second resistance R 2 is connected with the base stage of the first triode Q1, the collector of the first triode Q1 is connected with the output terminal of transformer by a biasing resistor R4, the first triode Q1 emitter is connected with one end of bidirectional thyristor Q2, one end that the other end of bidirectional thyristor Q2 is connected with loudspeaker Y connects, the other end of loudspeaker Y is connected with the output terminal of transformer T1.Also comprise that first capacitor C 1 and is with the 3rd resistance R 3, one end of the first capacitor C 1 is connected with the cathode terminal of the first diode D1, the other end ground connection of the first capacitor C 1, one end of the 3rd resistance R 3 is connected with the base stage of the first triode Q1, the other end ground connection of the 3rd resistance R 3.Also comprise a second diode D2 and the second capacitor C 2, the second diode D2 is connected between described biasing resistor R4 and the output terminal of transformer T1, one end of described the second capacitor C 2 is connected with the cathode terminal of the second diode D2, the other end ground connection of the second capacitor C 2.Also comprise a light emitting diode G, this light emitting diode G is connected in parallel on the two ends of loudspeaker Y.By sending out diode and loudspeaker, while having inflammable gas to occur, can carry out sound and light alarm.
Claims (5)
1. smoke alarm, it is characterized in that, comprise transformer, gas sensor, the first resistance, the first diode, the second resistance, the first triode, bidirectional thyristor and loudspeaker, the output terminal of transformer is connected with the input end of gas sensor, the output terminal of gas sensor is connected with one end of the first resistance, the other end of the first resistance is connected with the anode tap of the first diode, the cathode terminal of the first diode is connected with one end of the second resistance, the other end of the second resistance is connected with the base stage of the first triode, the collector of the first triode is connected with the output terminal of transformer by a biasing resistor, the first transistor emitter is connected with one end of bidirectional thyristor, one end that the other end of bidirectional thyristor is connected with loudspeaker connects, the other end of loudspeaker is connected with the output terminal of transformer.
2. smoke alarm according to claim 1, it is characterized in that: also comprise that first electric capacity and is with the 3rd resistance, one end of the first electric capacity is connected with the cathode terminal of the first diode, the other end ground connection of the first electric capacity, one end of the 3rd resistance is connected with the base stage of the first triode, the other end ground connection of the 3rd resistance.
3. smoke alarm according to claim 1, it is characterized in that: also comprise second diode and the second electric capacity, the second diode is connected between described biasing resistor and the output terminal of transformer, one end of described the second electric capacity is connected with the cathode terminal of the second diode, the other end ground connection of the second electric capacity.
4. smoke alarm according to claim 1, is characterized in that: also comprise a light emitting diode, this light emitting diode is connected in parallel on the two ends of loudspeaker.
5. smoke alarm according to claim 1, is characterized in that: described the first resistance is slide rheostat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320373888.4U CN203405902U (en) | 2013-06-25 | 2013-06-25 | Smoke alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320373888.4U CN203405902U (en) | 2013-06-25 | 2013-06-25 | Smoke alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203405902U true CN203405902U (en) | 2014-01-22 |
Family
ID=49941826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320373888.4U Expired - Fee Related CN203405902U (en) | 2013-06-25 | 2013-06-25 | Smoke alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203405902U (en) |
-
2013
- 2013-06-25 CN CN201320373888.4U patent/CN203405902U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 Termination date: 20140625 |
|
| EXPY | Termination of patent right or utility model |