CN103473880A - High-sensitivity smoke alarm - Google Patents
High-sensitivity smoke alarm Download PDFInfo
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- CN103473880A CN103473880A CN2013104355728A CN201310435572A CN103473880A CN 103473880 A CN103473880 A CN 103473880A CN 2013104355728 A CN2013104355728 A CN 2013104355728A CN 201310435572 A CN201310435572 A CN 201310435572A CN 103473880 A CN103473880 A CN 103473880A
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- 239000000779 smoke Substances 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000004744 fabric Substances 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 206010000369 Accident Diseases 0.000 abstract 1
- 239000004519 grease Substances 0.000 abstract 1
- 239000000123 paper Substances 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003412 degenerative effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a high-sensitivity smoke alarm. The high-sensitivity smoke alarm comprises a 6V direct-current power source, a smoke detection circuit, a smoke signal sampling and amplitude-stabilizing circuit, a phase inverter circuit and state indicating circuit and a buzzer driving circuit. The smoke detection circuit is composed of an infrared light-emitting diode D1, a photosensitive transistor VT1 and a resistor R1, and a selected model of the photosensitive transistor VT1 is 3DU1 or 3DU5. The smoke signal sampling and amplitude-stabilizing circuit is composed of a potentiometer RP, a switching diode D2 and an electrolytic capacitor C1; and the buzzer driving circuit is composed of an NPN transistor VT3 and a buzzer HA. The high-sensitivity smoke alarm is suitable for timely detection and alarm against smoke formed by fires at an initial stage caused to wood, paper, cloth, woolen products, rubber products, plastic products and grease and the like. Large fire accidents can be effectively avoided, and property loss or harm to lives caused by the fires can be effectively avoided or reduced.
Description
Technical field
The invention belongs to Smoke Detection technology and security against fire field, is about a kind of highly sensitive smoke alarm.Background technology
Highly sensitive smoke alarm of the present invention utilizes infrarede emitting diode and the ingenious combination of Photosensitive transistor as a kind of alarm that detects smog, and it is applicable to carry out in time detection alarm because of formed smog of during Initial Stage of Fire such as timber, paper, cloth, woolen, rubber, plastic products and greases.Can effectively avoid leading to larger fire failure, effectively avoid or reduce because fire causes the loss of property or life and endanger.That its circuit has is simple in structure, power consumption is little, and circuit is substantially without characteristics such as debugging.
Below describe highly sensitive smoke alarm of the present invention related relevant technologies content in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: highly sensitive smoke alarm of the present invention utilizes infrarede emitting diode and the ingenious combination of Photosensitive transistor as a kind of alarm that detects smog, and it is applicable to carry out in time detection alarm because of formed smog of during Initial Stage of Fire such as timber, paper, cloth, woolen, rubber, plastic products and greases.Can effectively avoid leading to larger fire failure, effectively avoid or reduce because fire causes the loss of property or life and endanger.That its circuit has is simple in structure, power consumption is little, and circuit is substantially without characteristics such as debugging.
The circuit working principle: highly sensitive smoke alarm consists of infrarede emitting diode D1, Photosensitive transistor VT1.When the clean non smoke of the environment be monitored, infrarede emitting diode D1 is luminous with the initial current mixed up in advance, after this infrared light is received by Photosensitive transistor VT1, collector and the resistance between emitter of Photosensitive transistor VT1 are very little, make the electric current in infrarede emitting diode D1 and Photosensitive transistor VT1 series circuit increase, the corresponding increase of the luminous intensity of infrarede emitting diode D1, the internal resistance of Photosensitive transistor VT1 further reduces.So circulation just forms strong positive feedback process, electric current until make to connect in the Smoke Detection circuit reaches maximal value, the pressure drop produced on resistance R 1 makes NPN transistor VT2 conducting through switching diode D2, NPN transistor VT3 cut-off simultaneously, and hummer HA does not work.
When in the environment be monitored, smog sharply increases, the rapid variation of air light transmission between infrarede emitting diode D1 and Photosensitive transistor VT1.The luminous flux that now Photosensitive transistor VT1 receives reduces, and Photosensitive transistor VT1 internal resistance increases, and the electric current in the series connection photosensitive circuit also reduces thereupon, and the luminous intensity of infrarede emitting diode D1 also weakens thereupon.So circulation has just formed degenerative process, make to connect electric current in photosensitive circuit until be reduced to the initial current value, the voltage on resistance R 1 also drops to below 1.2V, makes NPN transistor VT2 cut-off, NPN transistor VT3 conducting, hummer HA must establish beginning work by cable.Electrochemical capacitor C1 arranges for fixed ampllitude, can effectively prevent of short duration undesired signal.
Technical scheme: highly sensitive smoke alarm, it comprises 6V direct supply, Smoke Detection circuit, smoke signal sampling and fixed amplitude circuit, phase inverter and condition indication circuit, buzzer drive circuit, it is characterized in that:
The Smoke Detection circuit: it is comprised of infrarede emitting diode D1, Photosensitive transistor VT1 and resistance R 1, the anodal VCC of the anodal connection circuit of infrarede emitting diode D1, the negative pole of infrarede emitting diode D1 connects the collector of Photosensitive transistor VT1, and the emitter of Photosensitive transistor VT1 is by resistance R 1 connection circuit ground GND;
Smoke signal sampling and fixed amplitude circuit: it is comprised of potentiometer RP, switching diode D2 and electrochemical capacitor C1, the negative pole of the termination infrarede emitting diode D1 of potentiometer RP and the collector of Photosensitive transistor VT1, the positive pole of the activity termination switching diode D2 of potentiometer RP, the other end connection circuit ground GND of potentiometer RP, the negative pole of switching diode D2 connects positive pole and phase inverter and the condition indication circuit of electrochemical capacitor C1, the negative pole connection circuit ground GND of electrochemical capacitor C1;
Phase inverter and condition indication circuit: it is comprised of NPN transistor VT2, LED and resistance R 2, the base stage of NPN transistor VT2 connects the negative pole of switching diode D2, the collector of NPN transistor VT2 passes through the negative pole of resistance R 2 sending and receiving optical diode LED, the anodal VCC of the anodal connection circuit of LED;
Buzzer drive circuit: it is comprised of NPN transistor VT3 and hummer HA, the base stage of NPN transistor VT3 connects the collector of NPN transistor VT2, the collector of NPN transistor VT3 connects the negative pole of hummer HA, the anodal VCC of the anodal connection circuit of hummer HA, the emitter connection circuit ground GND of NPN transistor VT3;
The 6V DC power anode is connected with circuit anode VCC, and the 6V DC power cathode is connected with circuit ground GND.
The accompanying drawing explanation
Accompanying drawing is the embodiment circuit working schematic diagram that the invention provides a highly sensitive smoke alarm.
Embodiment
According to highly sensitive smoke alarm circuit working schematic diagram shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in embodiment requires and the circuit production main points are implemented to realize the present invention, below in conjunction with embodiment, correlation technique of the present invention is further described.
The selection of components and parts and technical parameter thereof
D1 is infrarede emitting diode;
D2 is switching diode, and the model of selecting is 1N4148;
LED is light emitting diode, selects ￠ 5 red light emitting diodes;
VT1 is the Photosensitive transistor, and the model of selecting is 3DU1 or 3DU5 etc.;
VT2 and VT3 are NPN transistor, and the model of selecting is 2SC9013, β >=150;
Resistance is all used metalfilmresistor, and resistance R 1 resistance is 3.3K Ω; Resistance R 2 resistances are 430 Ω;
RP is potentiometer, selects the linear potentiometer that resistance is 2.7K Ω;
C1 is electrochemical capacitor, and its capacity is 100 μ F/16V;
HA selects the CPB14A12-4.0 type to carry source of sound minisize dc piezoelectric buzzer, and its parameter is: physical dimension is ￠ 14mm * 7.5mm, and operating voltage is 4～9V, working current≤18mA.
Circuit production main points and circuit debugging
Because of the circuit structure of highly sensitive smoke alarm fairly simple, as long as the electronic devices and components performance of generally selecting is intact, and the components and parts annexation in accompanying drawing is welded to specifications, physical connection line and welding quality are after careful inspection is correct, circuit of the present invention does not need to carry out any debugging substantially, and connecting the 6V direct supply can work;
When circuit debugging, finite concentration smog is placed between infrarede emitting diode D1 and Photosensitive transistor VT1, adjust the potentiometer RP in smoke signal sampling and fixed amplitude circuit, make the Smoke Detection circuit in more satisfactory critical conditions;
In order to detect smog, can to cover room wider, the highly sensitive smoke alarm of making can be placed in to a place that collection smog space is arranged; Cut and be not arranged on the more intense position of cross-ventilation, the difficult zones of circulating of air such as corner can be installed;
The low weight characteristics according to smog, the setting height(from bottom) of highly sensitive smoke alarm requires in the 2.3m left and right, on the wall of the low 30cm of ceiling.
Claims (1)
1. a highly sensitive smoke alarm, it comprises 6V direct supply, Smoke Detection circuit, smoke signal sampling and fixed amplitude circuit, phase inverter and condition indication circuit, buzzer drive circuit, it is characterized in that:
Described Smoke Detection circuit is comprised of infrarede emitting diode D1, Photosensitive transistor VT1 and resistance R 1, the model that Photosensitive transistor VT1 selects is 3DU1 or 3DU5, the anodal VCC of the anodal connection circuit of infrarede emitting diode D1, the negative pole of infrarede emitting diode D1 connects the collector of Photosensitive transistor VT1, and the emitter of Photosensitive transistor VT1 is by resistance R 1 connection circuit ground GND;
Described smoke signal sampling and fixed amplitude circuit are comprised of potentiometer RP, switching diode D2 and electrochemical capacitor C1, the negative pole of the termination infrarede emitting diode D1 of potentiometer RP and the collector of Photosensitive transistor VT1, the positive pole of the activity termination switching diode D2 of potentiometer RP, the other end connection circuit ground GND of potentiometer RP, the negative pole of switching diode D2 connects positive pole and phase inverter and the condition indication circuit of electrochemical capacitor C1, the negative pole connection circuit ground GND of electrochemical capacitor C1;
Described phase inverter and condition indication circuit are comprised of NPN transistor VT2, LED and resistance R 2, the base stage of NPN transistor VT2 connects the negative pole of switching diode D2, the collector of NPN transistor VT2 passes through the negative pole of resistance R 2 sending and receiving optical diode LED, the anodal VCC of the anodal connection circuit of LED;
Described buzzer drive circuit is comprised of NPN transistor VT3 and hummer HA, the base stage of NPN transistor VT3 connects the collector of NPN transistor VT2, the collector of NPN transistor VT3 connects the negative pole of hummer HA, the anodal VCC of the anodal connection circuit of hummer HA, the emitter connection circuit ground GND of NPN transistor VT3;
Described 6V DC power anode is connected with circuit anode VCC, and the 6V DC power cathode is connected with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310435572.8A CN103473880B (en) | 2013-09-23 | 2013-09-23 | High-sensitivity smoke alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310435572.8A CN103473880B (en) | 2013-09-23 | 2013-09-23 | High-sensitivity smoke alarm |
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| Publication Number | Publication Date |
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| CN103473880A true CN103473880A (en) | 2013-12-25 |
| CN103473880B CN103473880B (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310435572.8A Active CN103473880B (en) | 2013-09-23 | 2013-09-23 | High-sensitivity smoke alarm |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106197837A (en) * | 2016-06-15 | 2016-12-07 | 安徽江淮汽车股份有限公司 | A kind of vehicle engine oil pressure alarm system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1489128A (en) * | 1974-09-13 | 1977-10-19 | Nohmi Bosai Kogyo Co Ltd | Smoke detectors |
| US4063227A (en) * | 1975-09-08 | 1977-12-13 | Cega, Inc. | Smoke detector |
| JPS5890159A (en) * | 1981-11-26 | 1983-05-28 | Nittan Co Ltd | Ionization-type smoke sensor |
| JPH0573786A (en) * | 1991-09-10 | 1993-03-26 | Matsushita Electric Works Ltd | Photoelectric smoke sensor |
| CN202534096U (en) * | 2012-01-11 | 2012-11-14 | 泉州雷航电子有限公司 | Smoke detector |
| CN203455916U (en) * | 2013-09-23 | 2014-02-26 | 何林 | Smoke alarm with high sensitivity |
-
2013
- 2013-09-23 CN CN201310435572.8A patent/CN103473880B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1489128A (en) * | 1974-09-13 | 1977-10-19 | Nohmi Bosai Kogyo Co Ltd | Smoke detectors |
| US4063227A (en) * | 1975-09-08 | 1977-12-13 | Cega, Inc. | Smoke detector |
| JPS5890159A (en) * | 1981-11-26 | 1983-05-28 | Nittan Co Ltd | Ionization-type smoke sensor |
| JPH0573786A (en) * | 1991-09-10 | 1993-03-26 | Matsushita Electric Works Ltd | Photoelectric smoke sensor |
| CN202534096U (en) * | 2012-01-11 | 2012-11-14 | 泉州雷航电子有限公司 | Smoke detector |
| CN203455916U (en) * | 2013-09-23 | 2014-02-26 | 何林 | Smoke alarm with high sensitivity |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106197837A (en) * | 2016-06-15 | 2016-12-07 | 安徽江淮汽车股份有限公司 | A kind of vehicle engine oil pressure alarm system |
| CN106197837B (en) * | 2016-06-15 | 2018-12-14 | 安徽江淮汽车集团股份有限公司 | A kind of vehicle engine oil pressure alarm system |
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| CN103473880B (en) | 2015-09-02 |
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Effective date of registration: 20161214 Address after: In Dazu County, Chongqing city 402366 beam town streets 1 groups Patentee after: Qin Qin Address before: A road 400000 Chongqing Jiulongpo District of Shiqiaopu Science Park Patentee before: CHONGQING RADIO & TV UNIVERSITY |
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