CN104021651A - Coal gas alertor circuit - Google Patents
Coal gas alertor circuit Download PDFInfo
- Publication number
- CN104021651A CN104021651A CN201410264838.1A CN201410264838A CN104021651A CN 104021651 A CN104021651 A CN 104021651A CN 201410264838 A CN201410264838 A CN 201410264838A CN 104021651 A CN104021651 A CN 104021651A
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- pin
- circuit
- alertor
- coal gas
- gas
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention relates to a coal gas alertor circuit. The coal gas alertor circuit comprises a gas-sensitive sensor, a trigger, a loud speaker, a relay and a power source. A chip of the trigger is 74LS121, a pin 1 and a pin 4 are connected with an adjustable resistor, a pin 5 is connected with the positive electrode of the power source after being connected with a resistor, a pin 7 is connected with the negative electrode of the power source, a pin 14 is connected with the positive electrode of the power source and a pin 6 is used for outputting signals. The pin 6 of the 74LS121 outputs the signals to the base of an audion Q2 and the collector of the Q2 is connected with the loud speaker B. The coal gas alertor circuit is simple and reliable, low in cost and simple in structure.
Description
Technical field
The present invention relates to electronic technology technical field, relate in particular to a kind of gas leak detector circuit.
Background technology
Fuel gas alarm has been widely used in chemical plant, gas station, steel plant and multiple fields such as civilian at present, taking sound and light alarm as main.But burning in coal room, if due to careless manipulation, in people's sleep procedure, produce anthracemia even causing death's accident still have generation, therefore a kind of gas leak detector with degassing function arises at the historic moment.And existing alarm adopts Single-chip Controlling conventionally, complex structure, cost is high.
Summary of the invention
In view of the shortcoming of above-mentioned prior art, the invention provides a kind of gas leak detector circuit with degassing function, only use integrated circuit (IC) chip and discrete component, provide cost savings, reliability is high.
The present invention adopts following technical scheme: comprise gas sensor, trigger, loudspeaker, relay and power supply, wherein trigger chip adopts 74LS121, its 1 pin and 4 pin connect an adjustable resistance, 5 pin connect positive source after connecing a resistance, 7 pin connect power cathode, 14 pin connect positive source, 6 pin output signals; The 6 pin output signals of described 74LS121 are to the base stage of triode Q2, and the collector of Q2 connects loudspeaker B.
Preferably, described gas sensor is QM-N5.
The invention has the beneficial effects as follows: circuit is simple and reliable, cost is low, simple in structure.
Brief description of the drawings
Fig. 1 is invention circuit diagram.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, when the gas alarm circuit with exhaust is reported to the police to the super concentration of coal gas, can automatically open scavenger fan, exhale pernicious gases in time, Accident prevention occurs.It is made up of Detection Circuit, audio power amplifier circuit, fan motor control circuit.
At ordinary times, gas sensor QM does not contact harmful gas, between two electrodes, is high impedance, and circuit is not reported to the police.In the time that harmful gas reaches finite concentration, QM two resistance between electrode are very little, now triode Q1 conducting, and chip 74LS121 work, loudspeaker sends chimes of doom.Colleague, Q3 is also driven conducting, and relay K A coil obtains electric, its closing of contact, scavenger fan work.The resistance that changes potentiometer RP can make this circuit report to the police under the harmful gas concentration requiring.
In use procedure, should avoid gas sensor by grease, contamination by dust, in order to avoid lose alarm function.
Be more than preferred embodiments of the present invention, but protection scope of the present invention is not limited to this.Any those of ordinary skill in the art are in the disclosed technical scope of the present invention, and the conversion of expecting without creative work or replacement, within all should being encompassed in protection scope of the present invention.Therefore protection scope of the present invention should be as the criterion with the protection domain that claim was limited.
Claims (2)
1. a gas leak detector circuit, it is characterized in that: comprise gas sensor, trigger, loudspeaker, relay and power supply, wherein trigger chip adopts 74LS121, its 1 pin and 4 pin connect an adjustable resistance, 5 pin connect positive source after connecing a resistance, 7 pin connect power cathode, and 14 pin connect positive source, 6 pin output signals;
The 6 pin output signals of described 74LS121 are to the base stage of triode Q2, and the collector of Q2 connects loudspeaker B.
2. gas leak detector circuit according to claim 1, is characterized in that: described gas sensor is QM-N5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410264838.1A CN104021651A (en) | 2014-06-16 | 2014-06-16 | Coal gas alertor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410264838.1A CN104021651A (en) | 2014-06-16 | 2014-06-16 | Coal gas alertor circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104021651A true CN104021651A (en) | 2014-09-03 |
Family
ID=51438381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410264838.1A Pending CN104021651A (en) | 2014-06-16 | 2014-06-16 | Coal gas alertor circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104021651A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092097A (en) * | 2016-11-22 | 2018-05-29 | 郑州工业应用技术学院 | There is the power outlet of waterproofing protection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05174271A (en) * | 1991-12-24 | 1993-07-13 | Matsushita Electric Works Ltd | Gas leakage alarm and its monitoring device |
| CN201629027U (en) * | 2010-01-29 | 2010-11-10 | 陕西科技大学 | Household gas leakage alarm and processing device |
| CN202339615U (en) * | 2011-12-02 | 2012-07-18 | 成都酷玩网络科技有限公司 | Domestic small-sized coal gas alarm with exhausting function |
| CN203376840U (en) * | 2013-08-26 | 2014-01-01 | 黄勇 | Combustible gas and smoke leakage warning device |
-
2014
- 2014-06-16 CN CN201410264838.1A patent/CN104021651A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05174271A (en) * | 1991-12-24 | 1993-07-13 | Matsushita Electric Works Ltd | Gas leakage alarm and its monitoring device |
| CN201629027U (en) * | 2010-01-29 | 2010-11-10 | 陕西科技大学 | Household gas leakage alarm and processing device |
| CN202339615U (en) * | 2011-12-02 | 2012-07-18 | 成都酷玩网络科技有限公司 | Domestic small-sized coal gas alarm with exhausting function |
| CN203376840U (en) * | 2013-08-26 | 2014-01-01 | 黄勇 | Combustible gas and smoke leakage warning device |
Non-Patent Citations (3)
| Title |
|---|
| 刘良福等: "基于AT89C51的燃气泄漏报警与应急处理器", 《微计算机信息》 * |
| 康华光等: "《电子技术基础 数字部分》", 31 July 2000, 《高等教育出版社》 * |
| 罗莹: "家庭煤气泄漏检测报警及控制装置", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092097A (en) * | 2016-11-22 | 2018-05-29 | 郑州工业应用技术学院 | There is the power outlet of waterproofing protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140903 |