CN212321497U - High-safety gas detection device - Google Patents
High-safety gas detection device Download PDFInfo
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- CN212321497U CN212321497U CN202020750803.XU CN202020750803U CN212321497U CN 212321497 U CN212321497 U CN 212321497U CN 202020750803 U CN202020750803 U CN 202020750803U CN 212321497 U CN212321497 U CN 212321497U
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Abstract
The utility model discloses a high security gas detection device, include: the detection circuit comprises a sensor assembly and a divider resistor R1, wherein the sensor assembly comprises two gas sensors P connected in parallel, the gas sensors P detect the gas concentration in the area in real time, the resistance value of the gas sensors P is reduced along with the increase of the gas concentration, and the detection circuit outputs the voltage value of the divider resistor R1 as an output gas concentration detection voltage signal in real time; the comparison circuit compares the gas concentration detection voltage signal output by the detection circuit with a preset reference voltage value, and outputs a high-level voltage signal when the gas concentration detection voltage signal is higher than the reference voltage value; a transmission circuit responding to the high level voltage signal output by the comparison circuit and outputting a control signal; and the warning circuit responds to the control signal and warns. The effect of improving the detection safety of the detection device is achieved.
Description
Technical Field
The utility model belongs to the technical field of the check out test set and specifically relates to a high security gas detection device is related to.
Background
The popularization of the fuel gas improves the production efficiency and the life quality of people, but in the process of using the fuel gas, accidents such as fuel gas explosion, poisoning and the like caused by fuel gas leakage, waste gas and the like occur, and the serious threat is brought to the life and property safety of people. Therefore, the safe use of the fuel gas is always the most important of the work of the fuel gas main department, the gas sensor can effectively detect the existence condition of the gas to be detected in the environment, the gas sensor forms a detection alarm system through an interface circuit, and the gas leakage alarm system can give an alarm in time to avoid accidents.
The fuel gas or smoke alarm circuit in the prior art can refer to Chinese patent with an authorization publication number of CN205563913U, and discloses a smoke detection grading alarm, which comprises a smoke detection circuit, a reference voltage detection circuit, a voltage follower, an operational amplification circuit, a comparison circuit and a singlechip display module; the smoke detection circuit and the reference voltage detection circuit are connected in parallel, and a voltage follower is respectively connected in series with the output ends of the smoke detection circuit and the reference voltage detection circuit to serve as a buffer stage between the smoke detection circuit and the operational amplification circuit; the output of the smoke detection circuit and the output of the reference voltage detection circuit are sent to the operational amplification circuit through the voltage follower and then sent to the comparison circuit, and the comparison result is output to the single chip microcomputer display module to be processed and the grade of the second triode of the smoke is displayed on the display screen.
The defects of the prior art are as follows: usually, only one gas sensor is installed in the detection circuit, and when the sensing of one gas sensor is damaged or the sensitivity of one gas sensor is poor, a great potential safety hazard exists only by arranging one gas sensor.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a high security gas detection device has the effect that improves detection device and detect the security.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a high safety gas detection device comprising:
the detection circuit comprises a sensor assembly and a divider resistor R1, wherein the sensor assembly comprises two gas sensors P connected in parallel, the gas sensors P detect the gas concentration in the area in real time, the resistance value of the gas sensors P is reduced along with the increase of the gas concentration, and the detection circuit outputs the voltage value of the divider resistor R1 as an output gas concentration detection voltage signal in real time;
the comparison circuit compares the gas concentration detection voltage signal output by the detection circuit with a preset reference voltage value, and outputs a high-level voltage signal when the gas concentration detection voltage signal is higher than the reference voltage value;
a transmission circuit responding to the high level voltage signal output by the comparison circuit and outputting a control signal;
and the warning circuit responds to the control signal and warns.
Through adopting above-mentioned technical scheme, when being detected the gas concentration in the region when higher, because two gas sensor P are parallelly connected, when one of them gas sensor P's resistance reduces, sensor assembly's total resistance reduces, consequently when one of them sensor P appears damaging or sensitivity reduces, detection circuitry also can export gas concentration detection voltage signal to comparison circuit, comparison circuit connects detection circuit and compares the gas concentration detection voltage signal that detection circuit exported with predetermined reference voltage value, be higher than reference voltage value output high level voltage signal, transmission circuit responds to high level voltage signal and output control signal, warning circuit responds to control signal and warns, through setting up the sensor assembly that connects in parallel each other, the function that improves detection device detection security has been realized.
The utility model discloses further set up to: the comparison circuit includes:
the circuit comprises a reference circuit and a comparator T, wherein the homodromous input end of the comparator T is connected with the output end of the detection circuit in series, and the inverting input end of the comparator T is connected with the output end of the reference circuit in series.
By adopting the technical scheme, when the voltage value of the equidirectional input end of the comparator T is higher than the voltage value of the reverse input end of the comparator T, a high-level voltage signal is output, the transmission circuit responds to the high-level voltage signal and outputs a control signal, when the voltage value of the equidirectional input end is lower than the voltage value of the reverse input end of the comparator T, a low-level voltage signal is output, the transmission circuit cannot respond to the low-level voltage signal, and the function of comparing the voltage value of the voltage-dividing resistor R1 with the reference voltage value is realized.
The utility model discloses further set up to: the reference circuit includes:
one end of the potentiometer RV1 is coupled with a power supply, and the other end of the potentiometer RV1 is grounded;
the regulation end of the operational amplifier K and the regulation end of the potentiometer RV1 are coupled in series with the same-direction input end of the operational amplifier K, the reverse input end of the operational amplifier K is coupled with the output end of the operational amplifier K, and the output end of the operational amplifier K is coupled with the reverse input end of the comparator T.
By adopting the technical scheme, the reference voltage value input by the reference voltage value input end of the comparator T is adjustable by adjusting the resistance value of the potentiometer RV1 and adjusting the voltage drop generated by the current through the potentiometer RV 1; the output end of the operational amplifier K is conducted with the inverting input end thereof by a wire to form a feedback circuit with a feedback resistance of almost zero, the voltage gain of the feedback circuit is basically 1, and the low-frequency characteristic is good.
The utility model discloses further set up to: further comprising:
and the delay circuit is coupled to the output end of the comparator T in series and outputs the high-level voltage signal to the transmission circuit in a delay way.
By adopting the technical scheme, after the comparison circuit outputs the gas concentration signal, the gas concentration signal is delayed for a certain time through the delay circuit and then is sent to the control circuit, and in the delay process, if the detection circuit always inputs the gas concentration detection voltage signal to the comparator T and the comparator T always outputs a high-level voltage signal, the gas is in a continuous leakage state, so that the detection device is not easy to generate false alarm operation.
The utility model discloses further set up to: the delay circuit comprises a first triode Q1, a first load resistor R4, a diode D1, a second load resistor R5 and a capacitor C, wherein a collector of the first triode Q1 is coupled in series with the first load resistor R4, a base of the first triode Q1 is coupled in series with an output terminal of the comparator T, an anode of the diode D1 is coupled in series with the first load resistor R4, a cathode of the diode D1 is coupled in series with the second load resistor R5, the capacitor C is coupled in series with the second load resistor R5, and the second load resistor R5 is coupled in series with an input terminal of the transmission circuit.
By adopting the technical scheme, after the comparator T outputs a high-level voltage signal, the first triode Q1 is switched on, because current passes through and voltage drop is generated in the first load resistor R4, the diode D1 is in a cut-off state, the power supply charges the capacitor C through the second load resistor R5 until the diode D1 is switched on, the delay circuit can transmit a signal to the transmission circuit at the moment, the comparator T outputs the high-level voltage signal all the time in the process, the gas is in a continuous leakage state, the transmission circuit responds to the transmission signal output by the delay circuit and sends out a control signal, and the warning circuit responds to the control signal and warns.
The utility model discloses further set up to: the transmission circuit comprises a second triode Q2, a relay KM and a loudspeaker E, wherein the relay KM comprises an electromagnetic coil M, the electromagnetic coil M is coupled with the loudspeaker E in series, a collector electrode of the second triode Q2 is coupled with the electromagnetic coil M in series, a base electrode of the second triode Q2 is coupled with a second load resistor R5 in series, and the electromagnetic coil M sends out a control signal after being electrified.
Through adopting above-mentioned technical scheme, electric capacity C charges and accomplishes the back, and second triode Q2 switches on, and supply current flows through speaker E and relay KM, and speaker E plays the warning effect to the staff that is located in the detection area, and the staff that conveniently is located in the detection area in time inspects the gas switch.
The utility model discloses further set up to: the warning circuit comprises a microprocessor and a display, the microprocessor responds to a control signal output by the transmission circuit and warns through the display, the relay KM comprises a normally open contact S, the normally open contact S responds to a control signal sent by the electromagnetic coil M, and the microprocessor is connected in series with the normally open contact S.
By adopting the technical scheme, after the electromagnetic coil M is electrified, the normally open contact S is closed, the warning circuit is conducted, the microprocessor receives the control signal and outputs the control signal to the display, the function of displaying the gas concentration voltage signal on the display is achieved, and the observation of a worker is facilitated.
The utility model discloses further set up to: the gas sensor P is a QM-N5 type gas sensor P.
By adopting the technical scheme, the QM-N5 has the advantages of high sensitivity, high response speed, large output signal, long service life, stable and reliable work and improvement on the detection safety of the detection device.
To sum up, the utility model discloses a beneficial technological effect does:
1. when the gas concentration in the detected area is high, because the two gas sensors P are connected in parallel, when the resistance value of one gas sensor P is reduced, the total resistance value of the sensor assembly is reduced, therefore, when one gas sensor P is damaged or the sensitivity is reduced, the detection circuit can also output a gas concentration detection voltage signal to the comparison circuit, the comparison circuit is connected with the detection circuit and compares the gas concentration detection voltage signal output by the detection circuit with a preset reference voltage value, a high-level voltage signal is output above the reference voltage value, the transmission circuit responds to the high-level voltage signal and outputs a control signal, the warning circuit responds to the control signal and warns, and the function of improving the detection safety of the detection device is realized by arranging the sensor assemblies which are connected in parallel with each other;
2. through setting up delay circuit, realized making detection device be difficult for sending the function of false detection alarm signal.
Drawings
FIG. 1 is a circuit schematic of a highlight detection circuit and a comparison circuit;
FIG. 2 is a circuit schematic of the highlighted delay circuit, transmission circuit and alert circuit;
FIG. 3 is a schematic circuit diagram highlighting the series coupling of the sensor and divider resistor R1;
FIG. 4 is a circuit schematic of a salient reference circuit.
Reference numerals: 1. a detection circuit; 2. a comparison circuit; 21. a reference circuit; 3. a delay circuit; 4. a transmission circuit; 5. an alarm circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, for the utility model discloses a high security gas detection device, including detection circuitry 1, comparison circuit 2, delay circuit 3, transmission circuit 4 and warning circuit 5.
Referring to fig. 1, the detection circuit 1 includes a sensor assembly and a voltage dividing resistor R1, the sensor assembly includes two gas sensors P connected in parallel, the gas sensors P are of type QM-N5 (fig. 3 is a schematic circuit diagram of the gas sensors P and the voltage dividing resistor R1 coupled in series), one end of the gas sensors P is coupled to a power supply, the other end of the gas sensors P is coupled to the voltage dividing resistor R1 in series, and the other end of the voltage dividing resistor R1 is grounded.
Referring to fig. 1 and 4, the comparison circuit 2 includes a comparator T and a reference circuit 21, a non-inverting input terminal of the comparator T being coupled in series with the gas sensor P, an inverting input terminal of the comparator T being coupled in series with an output terminal of the reference circuit 21, outputting a high-level voltage signal when a voltage at the non-inverting input terminal of the comparator T is higher than a voltage at the inverting input terminal of the comparator T, and outputting a low-level voltage signal when the voltage at the non-inverting input terminal of the comparator T is lower than the voltage at the inverting input terminal of the comparator T; the reference circuit 21 is a reference circuit 21 with an adjustable reference voltage value. The reference voltage value is adjustable, so that the sensitivity of the detection device can be adjusted.
Referring to fig. 4, the reference circuit 21 includes a reference resistor R2, an operational amplifier K, and a potentiometer RV1, the potentiometer RV1 is coupled to the power supply, a common input terminal of the operational amplifier K is coupled in series to a regulation terminal of the potentiometer RV1, an inverting input terminal of the operational amplifier K is coupled to an output terminal of the operational amplifier K, an output terminal of the operational amplifier K is coupled to the reference resistor R2, and a reference resistor R2 is coupled in series to an inverting input terminal of the comparator T. The reference voltage value input by the reference voltage value input end of the comparator T is adjustable by adjusting the resistance value of the potentiometer RV1 and adjusting the voltage drop generated by the current through the potentiometer RV 1; the output end of the operational amplifier K is conducted with the inverting input end thereof by a wire to form a feedback circuit with a feedback resistance of almost zero, the voltage gain of the feedback circuit is basically 1, and the low-frequency characteristic is good.
Referring to fig. 1 and 2, the delay circuit 3 includes a first transistor Q1, a first load resistor R4, a diode D1, a second load resistor R5, and a capacitor C, wherein the first load resistor R4 is coupled to a power supply, a collector of the first transistor Q1 is coupled in series with the first load resistor R4, a base of the first transistor Q1 is coupled in series with an output terminal of the comparator T, an emitter of the first transistor Q1 is coupled in series with a first resistor R3, and the first resistor R3 is grounded; the cathode of the diode D1 is coupled in series with the first load resistor R4, the anode of the diode D1 is coupled in series with the second load resistor R5, the second load resistor R5 is coupled with the power supply, the capacitor C is coupled in series with both the diode D1 and the second load resistor R5, the capacitor C is set to ground, and the second load resistor R5 is coupled in series with the input terminal of the transmission circuit 4.
Referring to fig. 2, the transmission circuit 4 includes a second transistor Q2, a relay KM and a speaker E, the relay KM includes a solenoid M, the speaker E is coupled to a power source, the solenoid M is coupled to the speaker E in series, a collector of the second transistor Q2 is coupled to the solenoid M in series, a base of the second transistor Q2 is coupled to a second load resistor R5 in series, a second resistor R7 is coupled to an emitter of the second transistor Q2 in series, the second resistor R7 is grounded, and the solenoid M sends a control signal when energized.
Referring to fig. 2, warning circuit 5 includes microprocessor and display, and microprocessor responds the control signal of transmission circuit 4 output and warns through the display, and relay KM includes normally open contact S, and microprocessor and normally open contact S series coupling, normally open contact S and power coupling, microprocessor ground connection setting.
The implementation principle of the embodiment is as follows:
the reference voltage value input by the reverse input end of the comparator T is adjustable by adjusting the resistance value of the potentiometer RV 1; after the gas sensors P detect that the concentration of gas is increased, the resistance value between the ends of the gas sensors P is reduced, as the two gas sensors P are connected in parallel, as long as the resistance of one gas sensor P is reduced, the total resistance value of the sensor assembly is reduced, the voltage divided by the voltage dividing resistor R1 is increased, so that the voltage of the same-direction input end of the comparator T is higher than the voltage of the reverse input end of the comparator T, at the moment, the comparator T outputs a high-voltage level signal, the first triode Q1 is conducted, and a power supply coupled with the first load resistor R4 generates voltage drop through the first load resistor R4; the diode D1 is serially coupled to one end of the first load resistor R4, the voltage is higher, the diode D1 is cut off, the power supply charges the capacitor C through the second load resistor R5, the voltage at one ends of the diode D1 and the second load resistor R5 is gradually increased until the diode D1 is conducted, the charging time of the capacitor C is the delay time of the delay circuit 3, the second triode Q2 is conducted while the diode D1 is conducted, the loudspeaker E gives out sound to alarm, the current flows in the electromagnetic coil M, the normally open contact S is closed, the circuit connected with the microprocessor is conducted, and the microprocessor displays a gas alarm signal through the display; the QM-N5 has high sensitivity, fast response speed, large output signal, long service life, stable and reliable work and improved detection safety.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. A high security gas detection device, characterized by, includes:
the detection circuit (1) comprises a sensor assembly and a divider resistor R1, the sensor assembly comprises two gas sensors P connected in parallel, the gas sensors P detect the gas concentration in the area in real time, the resistance value of the gas sensors P is reduced along with the increase of the gas concentration, and the detection circuit (1) outputs the voltage value of the divider resistor R1 as an output gas concentration detection voltage signal in real time;
the comparison circuit (2) compares the gas concentration detection voltage signal output by the detection circuit (1) with a preset reference voltage value, and outputs a high-level voltage signal when the gas concentration detection voltage signal is higher than the reference voltage value;
a transmission circuit (4) which responds to the high-level voltage signal output by the comparison circuit (2) and outputs a control signal;
and the warning circuit (5) responds to the control signal and warns.
2. A high safety gas detection device according to claim 1, wherein the comparison circuit (2) comprises:
the circuit comprises a reference circuit (21) and a comparator T, wherein the same-direction input end of the comparator T is connected with the output end of the detection circuit (1) in series, and the reverse-direction input end of the comparator T is connected with the output end of the reference circuit (21) in series.
3. A high safety gas detection device according to claim 2, wherein the reference circuit (21) comprises:
one end of the potentiometer RV1 is coupled with a power supply, and the other end of the potentiometer RV1 is grounded;
the regulation end of the operational amplifier K and the regulation end of the potentiometer RV1 are coupled in series with the same-direction input end of the operational amplifier K, the reverse input end of the operational amplifier K is coupled with the output end of the operational amplifier K, and the output end of the operational amplifier K is coupled with the reverse input end of the comparator T.
4. The high-safety gas detection device according to claim 2, further comprising:
and the delay circuit (3) is coupled in series with the output end of the comparator T and outputs the high-level voltage signal to the transmission circuit (4) in a delay way.
5. A high safety gas detection device according to claim 4, wherein the delay circuit (3) comprises a first transistor Q1, a first load resistor R4, a diode D1, a second load resistor R5 and a capacitor C, wherein the collector of the first transistor Q1 is coupled in series with the first load resistor R4, the base of the first transistor Q1 is coupled in series with the output of the comparator T, the anode of the diode D1 is coupled in series with the first load resistor R4, the cathode of the diode D1 is coupled in series with the second load resistor R5, the capacitor C is coupled in series with the second load resistor R5, and the second load resistor R5 is coupled in series with the input of the transmission circuit (4).
6. A high safety gas detection device according to claim 5, wherein the transmission circuit (4) comprises a second transistor Q2, a relay KM and a speaker E, the relay KM comprises a solenoid M, the solenoid M is coupled in series with the speaker E, a collector of the second transistor Q2 is coupled in series with the solenoid M, a base of the second transistor Q2 is coupled in series with a second load resistor R5, and the solenoid M sends out a control signal when energized.
7. A high safety gas detection device according to claim 6, wherein the warning circuit (5) comprises a microprocessor and a display, the microprocessor is responsive to the control signal outputted from the transmission circuit (4) and is warned by the display, the relay KM comprises a normally open contact S, the normally open contact S is responsive to the control signal sent by the solenoid coil M, and the microprocessor is coupled in series with the normally open contact S.
8. The high-safety gas detection device as claimed in claim 1, wherein the gas sensor P is a QM-N5 type gas sensor P.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020750803.XU CN212321497U (en) | 2020-05-06 | 2020-05-06 | High-safety gas detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020750803.XU CN212321497U (en) | 2020-05-06 | 2020-05-06 | High-safety gas detection device |
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| CN212321497U true CN212321497U (en) | 2021-01-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115497259A (en) * | 2022-11-17 | 2022-12-20 | 无锡优耐特能源科技有限公司 | Modular false alarm prevention combustible gas leakage alarm device |
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2020
- 2020-05-06 CN CN202020750803.XU patent/CN212321497U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115497259A (en) * | 2022-11-17 | 2022-12-20 | 无锡优耐特能源科技有限公司 | Modular false alarm prevention combustible gas leakage alarm device |
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