CN205230281U - Combustible gas alarm with trouble self test function - Google Patents
Combustible gas alarm with trouble self test function Download PDFInfo
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- CN205230281U CN205230281U CN201520822569.6U CN201520822569U CN205230281U CN 205230281 U CN205230281 U CN 205230281U CN 201520822569 U CN201520822569 U CN 201520822569U CN 205230281 U CN205230281 U CN 205230281U
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Abstract
The utility model provides a combustible gas alarm with trouble self test function mainly comprises semiconductor gas sensor (1), amplifier circuit (2), digital analog converter (3), STC singlechip (4), failure detector circuit (5), audible alarm ware (6), host computer (7), serial communication module (8) and monitoring system (9). Each part is connected through auxiliary circuit. Sensor (1) is passed through amplifier circuit (2) with combustible gas thickness change changing into voltage signal and is enlargied, signal after enlargeing passes through digital analog converter (3) and is transformed into digital signals input singlechip (4) and carries out the analysis, failure detector circuit (5) are with circuit running state input singlechip (4) simultaneously, the analysis is carried out according to incoming signal in singlechip (4), then with signal transfer to audible alarm ware (6), it carries out the analysis simultaneously to spread into the signal into host computer (8) through serial communication (7), last host computer passes through the network with signal transmission to monitoring system (9) in order to realize the real -time supervision to whole production system.
Description
Technical field
A kind of flammable gas alarm with fault self-checking brake that the utility model relates to, particularly relates to electronic circuit and singlechip technology, can carry out Real-Time Monitoring, to ensure production and operation safety to the concentration of inflammable gas.
Background technology
Flammable gas alarm also claims gas leakage detection alarm instrument.When in industrial environment, everyday environments (as used the kitchen of rock gas), inflammable gas is revealed, when flammable gas alarm detects that inflammable gas concentration reaches the alarming value of alarm setting, flammable gas alarm will send sound, visual alarm, takes evacuating personnel, forces air draft, closes down the safety practices such as equipment to remind.Industrial fixed flammable gas alarm is made up of alarm controller and detector, controller mainly contains integrated circuit such as single-chip microcomputer at present and forms, detector is installed on the place that inflammable gas is the most easily revealed, its core component is built-in combustible gas sensor, and sensor detects the concentration of gas in air.The gas concentration that sensor detects by detector converts electric signal to, is transferred to controller single-chip microcomputer through amplifying, and when gas concentration meets or exceeds the alarm set point of single-chip microcomputer setting, alarm sends alerting signal, thus is ensured productive life safety.
Current reliability is the emphasis that alarm designs unit and commercial production unit are concerned about always.The alarm used in production line is after operation a period of time, and its fault is mainly manifested in the open circuit fault of heating system and the short circuit fault of sensor, so develop, a to have flammable gas alarm that is efficient and high reliability significant.
Summary of the invention
According to background technology, the purpose of this utility model is to provide a kind of flammable gas alarm, adopts reliable failure detector circuit, can detect sensor heater circuit whether open circuit and sensor self whether short circuit.And then realize monitoring the ruuning situation of alarm, guarantee commercial production safety.
To achieve these goals, the utility model is achieved through the following technical solutions:
A kind of flammable gas alarm with fault self-checking brake, be made up of semiconductor gas sensor (1), amplifying circuit (2), digital to analog converter (3), STC single-chip microcomputer (4), failure detector circuit (5), voice guard (6), host computer (7), serial communication modular (8) and monitoring system (9), it is characterized in that failure detector circuit is made up of broken circuit detection circuit (51) and sensor short circuit testing circuit (52).
Described failure detector circuit (5) is made up of broken circuit detection circuit (51) and sensor short circuit testing circuit (52) two parts, and connect in the near end of sensor in broken circuit detection circuit a resistance R
6.When sensor normally connects, resistance R
6with sensor (1) dividing potential drop, now there is faint voltage at resistance two ends, and single-chip microcomputer (4) can be detected by input interface; If sensor (1) power supply malunion is normal, then can produces open circuit, detect that resistance both end voltage is 0 thus fault detected.
In sensor short-circuit, (52) are by the base stage of sensor (1) signal loading to triode, control the on off state of triode.When sensor (1) normally works, output voltage is millivolt level, and triode is in cut-off state.When sensor (1) breaks down, output voltage becomes large, now triode ON, collector voltage becomes 0V, there is negative saltus step, so the collector of triode to be connected to the external interrupt pin of single-chip microcomputer (4), to be that negative edge triggers by down trigger pattern configurations, just can to detect by interrupt mode the fault that sensor occurs.
Accompanying drawing illustrates:
Fig. 1 is a kind of flammable gas alarm with fault self-checking brake
Fig. 2 is amplifying circuit
Fig. 3 is broken circuit detection circuit
Fig. 4 is sensor short circuit testing circuit
Embodiment:
The utility model is implemented with reference to the accompanying drawings, elaborates below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of flammable gas alarm with fault self-checking brake is made up of semiconductor gas sensor (1), amplifying circuit (2), digital to analog converter (3), STC single-chip microcomputer (4), failure detector circuit (5), voice guard (6), host computer (7), serial communication modular (8) and monitoring system (9).Each several part is connected by auxiliary circuit.Combustable gas concentration change transitions is that voltage signal is amplified by amplifying circuit (2) by sensor (1), signal after amplification is transformed into digital signal input single-chip microcomputer (4) by digital to analog converter (3) and analyzes, circuit operations conditions is inputted single-chip microcomputer (4) by simultaneous faults testing circuit (5), single-chip microcomputer (4) is analyzed according to input signal, then voice guard (6) is passed the signal to, import signal into host computer (8) by serial communication (7) to analyze simultaneously, last host computer transfers signals to monitoring system (9) to realize the Real-Time Monitoring to whole production system by network.
As shown in Figure 2, amplifying circuit is made up of power supply, slide rheostat, two resistance, two integrated operational amplifiers, semiconductor gas sensors.
Slide rheostat R
5access power supply VCC1 other end ground connection, slide plate access integrated operational amplifier (21) normal phase input end end; Resistance in series R after the inverting input of integrated operational amplifier (21) and output terminal short circuit
3finally access the inverting input of integrated operational amplifier (22); The input end of sensor (1) and sensor heater circuit parallel connection access power supply VCC2, sensor heater circuit output terminal access broken circuit detection circuit (51), sensor (1) output terminal accesses the normal phase input end of integrated amplifier (22) after connecting with sensor short circuit testing circuit (52); The output terminal of integrated amplifier (22) and resistance R
4its inverting input is accessed after series connection.
The principle of work of amplifying circuit (2) is as follows:
After sensor (1) access power supply, the voltage signal of its output terminal inputs through the in-phase input end of integrated operational amplifier (22), undertaken amplifying rear output by integrated operational amplifier (22), wherein the output terminal of integrated operational amplifier (22) and its inverting input are by resistance R
4form negative feedback; Meanwhile, integrated operational amplifier (11) output terminal output reference voltage and R
3the inverting input of series connection access integrated operational amplifier (22), the inverting input of integrated operational amplifier (21) and output terminal short circuit, normal phase input end access slide rheostat is to realize adjustable reference voltage.
As shown in Figure 3, sensor broken circuit detection circuit comprises power supply, semiconductor gas sensor, a resistance.
The input end of semiconductor gas sensor (1) and heater circuit parallel connection access power supply VCC2, resistance R
6ground connection and in parallelly with single-chip microcomputer input interface access heater circuit output terminal.
Broken circuit detection circuit principle of work is as follows:
When sensor normally connects, resistance R
6with sensor dividing potential drop, now resistance R
6there is faint voltage at two ends, and single-chip microcomputer can be detected by input interface; If probe power malunion Chang Zehui produces open circuit, resistance R detected
6both end voltage is 0, thus microprocessor detect is to fault.
As shown in Figure 4, sensor short circuit testing circuit is made up of power supply, three resistance, triodes.
R
1with R
2the base stage of access triode in parallel, R
1other end access sensor output, R
2other end ground connection.Transistor emitter ground connection, R
7the collector that finally access triode in parallel with singlechip interruption interface after access power supply.
Sensor short circuit testing circuit principle of work is as follows:
Connect sensor signal with near end two resistance R
1, R
2two resistance intermediate potentials are loaded into the base stage of triode, control the on off state of triode.Collector is by external power supply VCC3 and resistance R
7electric current is provided, when normal operation of sensor, output voltage is millivolt level, triode is in cut-off state, when the sensor fails, output voltage becomes large, and now transistor collector voltage becomes 0V, there is negative saltus step, so the collector of triode to be connected to the external interrupt pin of microcontroller, to be that negative edge triggers by down trigger pattern configurations, just can to detect by interrupt mode the fault that sensor occurs.
Claims (3)
1. one kind has the flammable gas alarm of fault self-checking brake, by semiconductor gas sensor (1), amplifying circuit (2), digital to analog converter (3), STC single-chip microcomputer (4), failure detector circuit (5), voice guard (6), host computer (7), serial communication modular (8) and monitoring system (9) composition, it is characterized in that: combustable gas concentration change transitions is that voltage signal imports amplifying circuit (2) into and amplifies by sensor (1), signal after amplification is transformed into digital signal input single-chip microcomputer (4) by digital to analog converter (3) and analyzes, circuit operations conditions is inputted single-chip microcomputer (4) by simultaneous faults testing circuit (5), single-chip microcomputer (4) is analyzed according to input signal, then voice guard (6) is passed the signal to, import signal into host computer (8) by serial communication (7) to analyze simultaneously, last host computer transfers signals to monitoring system (9) by network.
2. one kind has the flammable gas alarm of fault self-checking brake, it is characterized in that: amplifying circuit (2) is made up of power supply, slide rheostat, two resistance, two integrated operational amplifiers, semiconductor gas sensors, slide rheostat R
5access power supply VCC1 other end ground connection, slide plate access integrated operational amplifier (21) normal phase input end, resistance in series R after the inverting input of integrated operational amplifier (21) and output terminal short circuit
3finally access the inverting input of integrated operational amplifier (22), the input end of semiconductor gas sensor (1) and heater circuit parallel connection access power supply VCC2, heater circuit output terminal access broken circuit detection circuit (51), semiconductor gas sensor (1) output terminal accesses the normal phase input end of integrated operational amplifier (22) after connecting with sensor short circuit testing circuit (52), the output terminal of integrated operational amplifier (22) and resistance R
4its inverting input is accessed after series connection.
3. one kind has the flammable gas alarm of fault self-checking brake, it is characterized in that: be made up of broken circuit detection circuit (51) and sensor short circuit testing circuit (52), broken circuit detection circuit comprises power supply, combustible gas sensor, a resistance, the input end of semiconductor transducer (1) and heater circuit parallel connection access power supply VCC2, resistance R
6ground connection and in parallelly with single-chip microcomputer input interface access heater circuit output terminal; Sensor short circuit testing circuit is made up of power supply, three resistance, triodes, R
1with R
2the base stage of access triode in parallel, R
1other end access sensor output, R
2other end ground connection, transistor emitter ground connection, R
7the collector that finally access triode in parallel with singlechip interruption interface after access power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520822569.6U CN205230281U (en) | 2015-10-23 | 2015-10-23 | Combustible gas alarm with trouble self test function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520822569.6U CN205230281U (en) | 2015-10-23 | 2015-10-23 | Combustible gas alarm with trouble self test function |
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| Publication Number | Publication Date |
|---|---|
| CN205230281U true CN205230281U (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520822569.6U Expired - Fee Related CN205230281U (en) | 2015-10-23 | 2015-10-23 | Combustible gas alarm with trouble self test function |
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|---|---|
| CN (1) | CN205230281U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106408883A (en) * | 2016-10-18 | 2017-02-15 | 哈尔滨理工大学 | Combustible gas alarm system |
| CN111044573A (en) * | 2019-11-28 | 2020-04-21 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
| CN111220674A (en) * | 2020-01-16 | 2020-06-02 | 上海博取环境技术有限公司 | PH sensor fault monitoring device and monitoring method thereof |
| CN115158381A (en) * | 2022-07-11 | 2022-10-11 | 石家庄国祥运输设备有限公司 | Smoke detection control circuit and control method for air conditioning unit of railway vehicle |
-
2015
- 2015-10-23 CN CN201520822569.6U patent/CN205230281U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106408883A (en) * | 2016-10-18 | 2017-02-15 | 哈尔滨理工大学 | Combustible gas alarm system |
| CN111044573A (en) * | 2019-11-28 | 2020-04-21 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
| CN111044573B (en) * | 2019-11-28 | 2022-04-08 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
| CN111220674A (en) * | 2020-01-16 | 2020-06-02 | 上海博取环境技术有限公司 | PH sensor fault monitoring device and monitoring method thereof |
| CN115158381A (en) * | 2022-07-11 | 2022-10-11 | 石家庄国祥运输设备有限公司 | Smoke detection control circuit and control method for air conditioning unit of railway vehicle |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Beijing Petro-Chemical Industry College Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Beijing Institute of Petrochemical Technology Document name: Notification of Termination of Patent Right |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181023 |