CN104361722A - Natural gas detection alarm ventilation circuit - Google Patents
Natural gas detection alarm ventilation circuit Download PDFInfo
- Publication number
- CN104361722A CN104361722A CN201410717280.8A CN201410717280A CN104361722A CN 104361722 A CN104361722 A CN 104361722A CN 201410717280 A CN201410717280 A CN 201410717280A CN 104361722 A CN104361722 A CN 104361722A
- Authority
- CN
- China
- Prior art keywords
- triode
- natural gas
- resistance
- gas
- transformer
- 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.)
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
Abstract
The invention discloses a natural gas detection alarm ventilation circuit which comprises a gas-sensitive detection circuit, a UA555 chip, a triode T1, a diode D1, a silicon controlled rectifier (SCR), a ventilator, a loudspeaker, a power supply circuit, a capacitor C2, a resistor R3, a resistor R4 and a resistor R5, wherein the gas-sensitive detection circuit comprises a gas-sensitive sensor MQ-4, a slide rheostat W, a resistor R1, a resistor R2 and a capacitor C1; the power supply circuit comprises a 220V-to-9V transformer, a battery pack, a current transformer, a singlechip, a driving diode and a relay KM. The natural gas detection alarm ventilation circuit can be used for automatically detecting natural gas in a room and making an alarm, and then the ventilator can be powered on to ventilate the room; as the battery pack and the 220V-to-9V transformer are adopted in the power supply circuit for supplying power, the reliability of a power supply is ensured.
Description
Technical field
The present invention relates to a kind of detection of natural gas warning ventilation circuit.
Background technology
In rock gas, methane itself is nontoxic, but sulfuretted hydrogen is to the toxic effect of human body.When Air Hydrogen Sulfide concentration reaches 0.02 gram/cubic metre, just can cause temporary transient calomel poisoning, occur feeling sick, dizzy, headache, the symptom such as tired.When Methane in Air content reaches more than 10%, the content of oxygen just reduces relatively, makes people occur weakness, the hypoxic conditions such as dizzy.During gas-firing, improper ventilation also can occur poisoning.Rock gas produces a large amount of carbon dioxide and water vapor in the process of burning, and the content of oxygen reduces relatively.Under oxygen-deficient condition, the methyl hydride combustion in rock gas is incomplete, just can produce a certain amount of carbon monoxide.Carbon monoxide can make human body severe depletion of oxygen, suffocates poisoning.Rock gas is inflammable gas, unless you give your whole attention to it, will have the danger of Fire explosion.In air, the concentration of rock gas is in the scope of 5% ~ 10% (volume), and meeting kindling material will explode.Rock gas to everybody life bring fast clean while, the worry also brought to us or even tragedy, so in use procedure, must take care.Except carrying out safety notice that Gas Company specifies, we are necessary to design a kind of device, when after generation natural gas leaking, can and alarm, as much as possible reduce the loss and casualties.Therefore be necessary to design a kind of can the warning ventilation circuit of rock gas in sensing chamber.
Summary of the invention
In order to overcome existing the problems referred to above, the object of the present invention is to provide a kind of can in sensing chamber rock gas and the detection of natural gas of automatic alarm and ventilation is reported to the police ventilation circuit.
In order to solve the problem, the present invention is by the following technical solutions: a kind of detection of natural gas is reported to the police ventilation circuit, it is characterized in that: comprise gas-sensitive detecting circuit, UA555 chip, triode T1, diode D1, silicon controlled rectifier SCR, scavenger fan, loudspeaker, power circuit and electric capacity C2, resistance R3, resistance R4 and resistance R5, described gas-sensitive detecting circuit comprises gas sensor MQ-4, slide rheostat W, resistance R1, resistance R2 and electric capacity C1, be connected with power circuit after the heating wire series connection slide rheostat W of gas sensor MQ-4, the test side A of gas sensor MQ-4 is connected with power circuit, test side B is connected with the base stage of triode T1, the collector of triode T1 is connected with UA555 chip, the output terminal of UA555 chip successively series resistor R4 is connected with the control end of silicon controlled rectifier SCR with after diode D1, described scavenger fan and loudspeaker parallel connection, silicon controlled rectifier SCR is as their power switch.
Further, described power circuit comprises 220V and turns 9V transformer, electric battery, current transformer, single-chip microcomputer, driving triode and relay K M, described 220V turns 9V transformer and electric battery and is detection of natural gas ventilation circuit of reporting to the police and provides 9V operating voltage, turn the normally closed contact of 9V transformer voltage output terminal serial connection relay K M at 220V, in electric battery loop, be connected in series the normally opened contact of relay K M; Described current transformer is arranged on line, and its signal output part is connected with described single-chip microcomputer, and single-chip microcomputer is connected with driving the base stage of triode, drives triode to drive relay K M.
Further, a protection branch road in parallel on described silicon controlled rectifier SCR, described protection branch road comprises resistance R5 and the electric capacity C3 of series connection.
The invention has the beneficial effects as follows:
1, can rock gas in an automatic sensing chamber, and report to the police, start scavenger fan and carry out ventilation;
2, power circuit adopts electric battery and 220V to turn 9V transformer-supplied, ensure that power supply reliability.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is described further:
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are elaborated:
As shown in Figure 1, specific embodiments of the invention comprise gas-sensitive detecting circuit, UA555 chip, triode T1, diode D1, silicon controlled rectifier SCR, scavenger fan, loudspeaker, power circuit and electric capacity C2, resistance R3, resistance R4 and resistance R5.
Described gas-sensitive detecting circuit comprises gas sensor MQ-4, slide rheostat W, resistance R1, resistance R2 and electric capacity C1, be connected with power circuit after the heating wire series connection slide rheostat W of gas sensor MQ-4, the test side A of gas sensor MQ-4 is connected with power circuit, test side B is connected with the base stage of triode T1, the collector of triode T1 is connected with UA555 chip, and the output terminal of UA555 chip successively series resistor R4 is connected with the control end of silicon controlled rectifier SCR with after diode D1; Described scavenger fan and loudspeaker parallel connection, silicon controlled rectifier SCR is as their power switch.Electric capacity C1 and electric capacity C2 is the amplitude in order to stable detection signal.
Described power circuit comprises 220V and turns 9V transformer, electric battery, current transformer, single-chip microcomputer, driving triode and relay K M, described 220V turns 9V transformer and electric battery and is detection of natural gas ventilation circuit of reporting to the police and provides 9V operating voltage, turn the normally closed contact of 9V transformer voltage output terminal serial connection relay K M at 220V, in electric battery loop, be connected in series the normally opened contact of relay K M; Described current transformer is arranged on line, and its signal output part is connected with described single-chip microcomputer, and single-chip microcomputer is connected with driving the base stage of triode, drives triode to drive relay K M.
In order to protect silicon controlled rectifier SCR, a protection branch road in parallel on described silicon controlled rectifier SCR, described protection branch road comprises resistance R5 and the electric capacity C3 of series connection.
Principle of work of the present invention is: under normal circumstances, detection of natural gas warning ventilation circuit is turned after civil power is changed by 9V transformer by 220V provides 9V voltage, if civil power power-off, after the current transformer be then arranged on civil power detects, signal is sent to single-chip microcomputer, single-chip microcomputer drives relay K M by triode Q2, the normally closed contact of relay disconnects, and normally opened contact closes, by electric battery for it provides voltage.
Detection of natural gas is reported to the police after ventilation power on circuitry, gas sensor MQ-4 bulk resistance changes along with the change of indoor concentration of natural gas, at ordinary times, if indoor do not have rock gas or concentration of natural gas lower, resistance between gas sensor two test side A, B is larger, make B point current potential lower than 1V, now, triode Q1 ends, 6 pin of IC are high level, 3 pin are low level, and silicon controlled rectifier SCR is in off-state, and scavenger fan and alarm do not work.
Once indoor concentration of natural gas exceedes permissible value, the resistance value at gas sensor A, B two ends reduces rapidly, and B point current potential is raised, triode Q1 conducting, 6 pin of IC are low level, and 3 pin export high level, silicon controlled rectifier SCR conducting, scavenger fan and alarm work simultaneously.Just quit work until indoor rock gas recovers permissible value.
The above is the preferred embodiment of the present invention, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also regarded as protection scope of the present invention.
Claims (3)
1. a detection of natural gas warning ventilation circuit, it is characterized in that: comprise gas-sensitive detecting circuit, UA555 chip, triode T1, diode D1, silicon controlled rectifier SCR, scavenger fan, loudspeaker, power circuit and electric capacity C2, resistance R3, resistance R4 and resistance R5, described gas-sensitive detecting circuit comprises gas sensor MQ-4, slide rheostat W, resistance R1, resistance R2 and electric capacity C1, be connected with power circuit after the heating wire series connection slide rheostat W of gas sensor MQ-4, the test side A of gas sensor MQ-4 is connected with power circuit, test side B is connected with the base stage of triode T1, the collector of triode T1 is connected with UA555 chip, the output terminal of UA555 chip successively series resistor R4 is connected with the control end of silicon controlled rectifier SCR with after diode D1, described scavenger fan and loudspeaker parallel connection, silicon controlled rectifier SCR is as their power switch.
2. detection of natural gas warning ventilation circuit according to claim 1, it is characterized in that: described power circuit comprises 220V and turns 9V transformer, electric battery, current transformer, single-chip microcomputer, driving triode and relay K M, described 220V turns 9V transformer and electric battery and is detection of natural gas ventilation circuit of reporting to the police and provides 9V operating voltage, turn the normally closed contact of 9V transformer voltage output terminal serial connection relay K M at 220V, in electric battery loop, be connected in series the normally opened contact of relay K M; Described current transformer is arranged on line, and its signal output part is connected with described single-chip microcomputer, and single-chip microcomputer is connected with driving the base stage of triode, drives triode to drive relay K M.
3. detection of natural gas warning ventilation circuit according to claim 1 and 2, is characterized in that: a protection branch road in parallel on described silicon controlled rectifier SCR, described protection branch road comprises resistance R5 and the electric capacity C3 of series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410717280.8A CN104361722A (en) | 2014-11-29 | 2014-11-29 | Natural gas detection alarm ventilation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410717280.8A CN104361722A (en) | 2014-11-29 | 2014-11-29 | Natural gas detection alarm ventilation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104361722A true CN104361722A (en) | 2015-02-18 |
Family
ID=52528980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410717280.8A Pending CN104361722A (en) | 2014-11-29 | 2014-11-29 | Natural gas detection alarm ventilation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104361722A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110223468A (en) * | 2019-05-30 | 2019-09-10 | 百度在线网络技术（北京）有限公司 | Intelligent sound alarm method, device, system, computer equipment and storage medium |
| CN113007449A (en) * | 2021-03-16 | 2021-06-22 | 河北省天然气有限责任公司 | Intelligent natural gas overhead pipe support and natural gas overhead pipe over-current alarm method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63313049A (en) * | 1987-06-16 | 1988-12-21 | Nippon Denso Co Ltd | Gas alarm device |
| CN202512706U (en) * | 2012-03-02 | 2012-10-31 | 成都掌握移动信息技术有限公司 | Gas leak alarm |
| CN203223405U (en) * | 2013-05-06 | 2013-10-02 | 傅华英 | Intelligent exhaust control system |
| CN203523128U (en) * | 2013-10-14 | 2014-04-02 | 济南合力达电力科技有限公司 | Central control-based fire emergency lamp equipped with own cell |
| CN204288451U (en) * | 2014-11-29 | 2015-04-22 | 济南职业学院 | Detection of natural gas warning ventilation circuit |
-
2014
- 2014-11-29 CN CN201410717280.8A patent/CN104361722A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63313049A (en) * | 1987-06-16 | 1988-12-21 | Nippon Denso Co Ltd | Gas alarm device |
| CN202512706U (en) * | 2012-03-02 | 2012-10-31 | 成都掌握移动信息技术有限公司 | Gas leak alarm |
| CN203223405U (en) * | 2013-05-06 | 2013-10-02 | 傅华英 | Intelligent exhaust control system |
| CN203523128U (en) * | 2013-10-14 | 2014-04-02 | 济南合力达电力科技有限公司 | Central control-based fire emergency lamp equipped with own cell |
| CN204288451U (en) * | 2014-11-29 | 2015-04-22 | 济南职业学院 | Detection of natural gas warning ventilation circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110223468A (en) * | 2019-05-30 | 2019-09-10 | 百度在线网络技术（北京）有限公司 | Intelligent sound alarm method, device, system, computer equipment and storage medium |
| CN113007449A (en) * | 2021-03-16 | 2021-06-22 | 河北省天然气有限责任公司 | Intelligent natural gas overhead pipe support and natural gas overhead pipe over-current alarm method |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20150218 |