CN104835283A - Smoke alarm - Google Patents
Smoke alarm Download PDFInfo
- Publication number
- CN104835283A CN104835283A CN201510283515.1A CN201510283515A CN104835283A CN 104835283 A CN104835283 A CN 104835283A CN 201510283515 A CN201510283515 A CN 201510283515A CN 104835283 A CN104835283 A CN 104835283A
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- resistance
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- operational amplifier
- gas
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/045—Circuits
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- Chemical & Material Sciences (AREA)
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- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Emergency Management (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Business, Economics & Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fire Alarms (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
The invention relates to a smoke alarm, and is characterized in that the smoke alarm includes a 9V direct current power supply, a smoke detection circuit, a voltage comparison circuit and an alarm drive circuit. The model that a gas-sensitive pipe HQ in the gas detection circuit selects is HQ-2; and the model that an operational amplifier IC1 in the voltage comparison circuit selects is LM324. The smoke alarm provided by the invention uses the gas-sensitive sensor as a detecting element, is suitable for detection and alarm of smoke generated when leather, wood, paper, cloth, woolen products, rubber products, plastic products, grease and the like catch fire, and can also be used for leak detection of volatile gas such as natural gas, coal gas, gasoline, carbon monoxide, hydrogen, alkanes, alcohols and so on.
Description
Technical field
The invention belongs to electronics and Smoke Detection alarm technique field, is about a kind of smoke alarm.
Background technology
Smoke alarm, also claims fire hazard aerosol fog alarm, smoke transducer, smoke sensing device etc.One is that independently product is battery-powered, or uses AC-powered (battery is as standby power supply), and it can send acousto-optic hint when reporting to the police, and it is referred to as free-standing smoke alarm; Another kind is connected by bus and powers, bus can be connected with multiple, network with fire alarm monitor, communication forms a warning system, on-the-spot voiceless sound during warning, host side acousto-optic is pointed out, this kind of smoke alarm unit of general title is smoke detector, smoke detector divide band geocoding or be not with geocoding.
Smoke alarm of the present invention utilizes gas sensor as a kind of smoke alarm of detecting element, and the smog that it is applicable to produce when leather, timber, paper, cloth, woolen, rubber, plastic products and grease etc. catch fire carries out detection alarm; Also can be used for the Leak Detection of the escaping gases such as rock gas, coal gas, gasoline, carbon monoxide, hydrogen, alkanes, alcohols.
Below describe necessity, the critical technology contents that smoke alarm of the present invention is involved in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: smoke alarm of the present invention utilizes gas sensor as a kind of smoke alarm of detecting element, the smog that it is applicable to produce when leather, timber, paper, cloth, woolen, rubber, plastic products and grease etc. catch fire carries out detection alarm; Also can be used for the Leak Detection of the escaping gases such as rock gas, coal gas, gasoline, carbon monoxide, hydrogen, alkanes, alcohols.
Circuit working principle: in smokeless environment, the resistance value between two electrode A of gas sensitive tube HQ (model: HQ-2), B is tens kilo-ohms, and when the smog in room being detected, its resistance can drop to several kilo-ohms.When the smog of indoor reaches certain concentration, gas sensitive tube HQ detects has smog to exist around, between two electrode A of gas sensitive tube HQ, B, resistance value reduces rapidly, the dividing potential drop that now operational amplifier IC1 is got by linear potentiometer increases thereupon, comparer in operational amplifier IC1 overturns rapidly, and the 1st pin of operational amplifier IC1 exports high level, makes NPN transistor VT1 conducting, NPN transistor VT1 collector can drive, as: the warning device such as flashlamp or voice.
Technical scheme: smoke alarm, it comprises 9V direct supply, Smoke Detection circuit, voltage comparator circuit, alarm drive circuit, it is characterized in that:
Smoke Detection circuit: it is made up of gas sensitive tube HQ, resistance R1 and linear potentiometer RP, the model that gas sensitive tube HQ selects is HQ-2,1st pin of gas sensitive tube HQ and the 3rd pin connection circuit positive pole VCC, 2nd pin of gas sensitive tube HQ is by resistance R1 connection circuit positive pole VCC, the 5th pin connection circuit ground GND of gas sensitive tube HQ, 4th pin of gas sensitive tube HQ and the 6th pin connect one end of linear potentiometer RP, the other end connection circuit ground GND of linear potentiometer RP;
Voltage comparator circuit: it is made up of operational amplifier IC1, resistance R2 and resistance R3, the model that operational amplifier IC1 selects is LM324,3rd pin of operational amplifier IC1 connects the movable end of linear potentiometer RP, one end of the 2nd pin connecting resistance R2 of operational amplifier IC1 and one end of resistance R3, the other end of the other end of resistance R2 and the 4th pin connection circuit positive pole VCC of operational amplifier IC1, resistance R3 and the 11st pin connection circuit ground GND of operational amplifier IC1;
Alarm drive circuit: it is made up of resistance R4, NPN transistor VT1 and hummer HA, the base stage of NPN transistor VT1 connects the 1st pin of operational amplifier IC1 by resistance R4, the collector of NPN transistor VT1 connects the negative pole of hummer HA, the emitter circuit ground GND of the positive pole connection circuit positive pole VCC of hummer HA, NPN transistor VT1;
9V DC power anode is connected with circuit anode VCC, and 9V DC power cathode is connected with circuit ground GND.
Accompanying drawing explanation
Accompanying drawing is the embodiment circuit working schematic diagram that the invention provides a smoke alarm.
Embodiment
According to smoke alarm circuit working schematic diagram shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in each several part circuit described in summary of the invention, and components and parts technical parameter described in embodiment requires and circuit production main points are carried out enforcement and can be realized the present invention, is further described correlation technique of the present invention below in conjunction with embodiment.
The technical parameter of components and parts and selection requirement thereof
HQ is gas sensitive tube, and select the gas sensitive tube being applicable to detecting smog, its model is HQ-2;
IC1 is operational amplifier, and the model selected is LM324, and it adopts 14 pin dual-in-line plastic package forms; Comprise four groups of identical operational amplifiers of form at its internal circuit, except power sharing, four groups of amplifiers are separate, only used 1 in four groups of operational amplifier LM324 in the present embodiment;
VT1 is NPN transistor, and the model selected is 3DK9 or selects 2SC9013;
RP is linear potentiometer, and the resistance of employing is 100K Ω, power is 1/2W solid potentiometer;
Resistance all uses metalfilmresistor, and the resistance of resistance R1 is 82 Ω, power is 1/2W; Resistance R2 resistance is 43K Ω; The resistance of resistance R3 is 22K Ω; The resistance of resistance R4 is 3.3K Ω;
HA is hummer, and selecting circuit is built-in with the hummer of audio generating circuit, and operating voltage is 9V;
DC is 9V direct supply, can use 9V D.C. regulated power supply, requires working current >=200mA.
Circuit production main points and circuit debugging
Because the circuit structure of smoke alarm is fairly simple, as long as the electronic devices and components performance selected is intact, and the components and parts annexation to specifications in accompanying drawing is welded, physical connection line and welding quality are through carefully checking correctly, and circuit of the present invention only needs to carry out simple debugging and can normally work;
When circuit debugging, gas sensitive tube HQ is put into certain density smog gas sample and detect bottle or sample sack, the resistance of adjustment linear potentiometer RP, makes gas sensitive tube HQ be in criticality alarm state;
Linear adjustment potentiometer RP can change comparator threshold current potential in operational amplifier IC1, for adjusting the sensitivity of smoke detection system;
When circuit is just started working, gas sensitive tube HQ can generate heat a period of time, and that is because the dirt on heating circuit voltage burning-off gas sensing resistance surface, belongs to normal phenomenon;
Enable smoke alarm cover the wider of room or storehouse to detect, normal conditions smoke alarm should be placed in higher position and be advisable.
Circuit components layout of the present invention, circuit structure design, its shape and size etc. of outward appearance are not all gordian techniquies of the present invention; neither application claims protection guardian technique content; because not affecting specific implementation process of the present invention, therefore do not illustrate one by one in the description.
Claims (1)
1. a smoke alarm, it comprises 9V direct supply, Smoke Detection circuit, voltage comparator circuit, alarm drive circuit, it is characterized in that:
Described Smoke Detection circuit is made up of gas sensitive tube HQ, resistance R1 and linear potentiometer RP, the model that gas sensitive tube HQ selects is HQ-2,1st pin of gas sensitive tube HQ and the 3rd pin connection circuit positive pole VCC, 2nd pin of gas sensitive tube HQ is by resistance R1 connection circuit positive pole VCC, the 5th pin connection circuit ground GND of gas sensitive tube HQ, 4th pin of gas sensitive tube HQ and the 6th pin connect one end of linear potentiometer RP, the other end connection circuit ground GND of linear potentiometer RP;
Described voltage comparator circuit is made up of operational amplifier IC1, resistance R2 and resistance R3, the model that operational amplifier IC1 selects is LM324,3rd pin of operational amplifier IC1 connects the movable end of linear potentiometer RP, one end of the 2nd pin connecting resistance R2 of operational amplifier IC1 and one end of resistance R3, the other end of the other end of resistance R2 and the 4th pin connection circuit positive pole VCC of operational amplifier IC1, resistance R3 and the 11st pin connection circuit ground GND of operational amplifier IC1;
Described alarm drive circuit is made up of resistance R4, NPN transistor VT1 and hummer HA, the base stage of NPN transistor VT1 connects the 1st pin of operational amplifier IC1 by resistance R4, the collector of NPN transistor VT1 connects the negative pole of hummer HA, the emitter circuit ground GND of the positive pole connection circuit positive pole VCC of hummer HA, NPN transistor VT1;
Described 9V DC power anode is connected with circuit anode VCC, and 9V DC power cathode is connected with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510283515.1A CN104835283A (en) | 2015-05-28 | 2015-05-28 | Smoke alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510283515.1A CN104835283A (en) | 2015-05-28 | 2015-05-28 | Smoke alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104835283A true CN104835283A (en) | 2015-08-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510283515.1A Pending CN104835283A (en) | 2015-05-28 | 2015-05-28 | Smoke alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104835283A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107170181A (en) * | 2017-06-14 | 2017-09-15 | 成都雷纳斯科技有限公司 | A kind of smog sensor circuit structure |
| CN110274935A (en) * | 2019-07-03 | 2019-09-24 | 西安交通大学 | The preparation method of alcohol alarm device and its indium oxide gas sensor |
| CN116071898A (en) * | 2023-04-06 | 2023-05-05 | 湖南孚谷时代科技有限公司 | Independent low-power consumption combustible gas alarm |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2059006U (en) * | 1989-10-21 | 1990-07-04 | 青岛崂山城阳电容器厂 | Gas alarming device |
| JP2001194330A (en) * | 2000-01-13 | 2001-07-19 | Yazaki Corp | Gas alarm unit and gas alarming method |
| CN103413402A (en) * | 2013-08-26 | 2013-11-27 | 黄勇 | Combustible gas and smog leakage reminding device |
| CN103440736A (en) * | 2013-09-11 | 2013-12-11 | 周芸 | Universal toxic gas alarm device |
| CN204632040U (en) * | 2015-05-28 | 2015-09-09 | 黄月华 | Smoke alarm |
-
2015
- 2015-05-28 CN CN201510283515.1A patent/CN104835283A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2059006U (en) * | 1989-10-21 | 1990-07-04 | 青岛崂山城阳电容器厂 | Gas alarming device |
| JP2001194330A (en) * | 2000-01-13 | 2001-07-19 | Yazaki Corp | Gas alarm unit and gas alarming method |
| CN103413402A (en) * | 2013-08-26 | 2013-11-27 | 黄勇 | Combustible gas and smog leakage reminding device |
| CN103440736A (en) * | 2013-09-11 | 2013-12-11 | 周芸 | Universal toxic gas alarm device |
| CN204632040U (en) * | 2015-05-28 | 2015-09-09 | 黄月华 | Smoke alarm |
Non-Patent Citations (1)
| Title |
|---|
| 任致程: "《经典智能电路300例》", 31 January 2003, 机械工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107170181A (en) * | 2017-06-14 | 2017-09-15 | 成都雷纳斯科技有限公司 | A kind of smog sensor circuit structure |
| CN110274935A (en) * | 2019-07-03 | 2019-09-24 | 西安交通大学 | The preparation method of alcohol alarm device and its indium oxide gas sensor |
| CN116071898A (en) * | 2023-04-06 | 2023-05-05 | 湖南孚谷时代科技有限公司 | Independent low-power consumption combustible gas alarm |
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Application publication date: 20150812 |