CN212845154U - Thing networking intelligent gas table alarm device - Google Patents
Thing networking intelligent gas table alarm device Download PDFInfo
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- CN212845154U CN212845154U CN202021483003.2U CN202021483003U CN212845154U CN 212845154 U CN212845154 U CN 212845154U CN 202021483003 U CN202021483003 U CN 202021483003U CN 212845154 U CN212845154 U CN 212845154U
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Abstract
The utility model relates to a thing networking intelligent gas table alarm device, including gas sensor, MCU monolithic controller and essential signal output circuit: the gas sensor is used for sending a detection concentration signal of leaked gas to the MCU; the MCU is used for sending a level signal to trigger the intrinsic signal output circuit after the gas concentration reaches a set threshold value; and the intrinsic signal output circuit outputs the current signal to the gas meter. The output signal is a two-wire three-state switch signal, 4mA represents that the alarm is connected but not in an alarm state, and 20mA represents that the alarm is connected and in an alarm state; 0mA represents a wire break state or an alarm is not connected, so that the function consumption is reduced, the active current signal with the two wires has the strongest anti-interference capability, and meanwhile, the two-wire current signal can transmit analog quantity, digital quantity, multi-state switching value and the like.
Description
Technical Field
The utility model relates to a thing networking intelligent gas table technical field, specifically speaking relates to a thing networking intelligent gas table alarm device.
Background
In the existing gas meter metering field, a cut-off valve is arranged in most gas meters, the gas meters can receive signals of an external gas alarm to realize a safety cut-off function, when gas leakage accidents occur, the gas volume concentration of gas leakage in air reaches the action threshold of the gas leakage alarm, the gas alarm sends out alarm signals to a safety cut-off membrane type gas meter, the gas meters actively cut off safety valves arranged in the gas meters, because the action threshold value of the gas alarm is far smaller than the gas explosion concentration threshold, the gas explosion of residences caused by the gas leakage accidents can be effectively prevented, under the condition that residences and population are more and more dense, if gas leakage occurs, fire or explosion is caused, the life and property safety of the masses can be seriously threatened, therefore, the gas safety of each household is ensured to be an indispensable ring in safety work, a large number of gas leakage alarm devices are also on the market, and meanwhile, a gas meter, as a gas metering device for household gas opening, must meet the intrinsic safety requirement, i.e., an electrical circuit in which electric sparks and thermal effects generated in normal operation or in a specified fault state cannot ignite a specified explosive mixture.
Chinese patent grant publication no: CN208126616U discloses a protection device and protection alarm device, which is characterized in that, the protection device is connected with the gas meter, the protection device includes: the detection module comprises a sensing circuit for detecting the gas concentration of the leaked fuel gas; the output module comprises a comparison circuit, an optical coupling circuit connected with the comparison circuit and an output circuit, and two ends of the output circuit are respectively connected with the optical coupling circuit and the gas meter; when the gas concentration transmitted by the sensing circuit is determined to be larger than a preset threshold value, the comparison circuit transmits a trigger signal to the output circuit through the optical coupling circuit, so that the gas meter closes a valve after detecting the trigger signal through the output circuit.
Above-mentioned patent passes through power module and steps down the commercial power and commutates and convert low pressure safety stabilization electric current into through power supply conversion circuit behind the filtering, for the protection device power supply has improved gas protection device's power consumption security, when can solving gas alarm and being connected with the gas table, the unsafe characteristic of gas alarm does not destroy the intrinsic safety of gas table self. However, when the gas meter identifies the passive switching value signal, an excitation power supply needs to be applied, the gas meter is mostly powered by a battery, the power consumption requirement is strict, and the gas meter cannot provide large electric energy to ensure the reliability of signal detection, so that the signal of the gas meter identification alarm is easily interfered by the outside.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the above-mentioned problem that exists among the prior art, provide a thing networking intelligent gas table alarm device, there are two kinds of states that shelter from and do not have infrared receiving tube when sheltering from through the testing light source and export sampling signal, through active current type essential safety output circuit output alarm state signal, output broken string, connect and report to the police three kinds of states.
In order to achieve the above purpose, the utility model adopts the following technical scheme.
The utility model provides an thing networking intelligent gas table alarm device, includes gas sensor, MCU monolithic controller and essential signal output circuit:
the gas sensor is used for sending a detection concentration signal of leaked gas to the MCU;
the MCU is used for sending a level signal to trigger the intrinsic signal output circuit after the gas concentration reaches a set threshold value;
the intrinsic signal output circuit outputs a current signal to the gas meter;
when the MCU single chip controller determines that the concentration of the gas transmitted by the gas sensor is greater than a preset threshold value, the MCU single chip controller triggers an output level signal to trigger an essential signal output circuit to output XmA current so as to send an alarm signal, and the gas meter closes a valve after receiving the alarm signal;
when the MCU single chip controller determines that the concentration of the gas transmitted by the gas sensor is smaller than a preset threshold value, the MCU single chip controller does not output a level signal, and the essential signal output circuit outputs YmA current to detect that the alarm works normally.
Gas sensor includes heating element and gas sensing resistor, be provided with heating resistor between the electrode terminal A and the electrode terminal B of sensor, direct current voltage 5V is connected to the electrode terminal A and the electrode terminal C of sensor, the electrode terminal B end of sensor is connected with the one end of resistance R1, there are resistance R1's the other end and heating resistor D ground connection, the electrode terminal B and the MCU monolithic controller of sensor are connected.
The intrinsic signal output circuit comprises a PNP type triode Q3, an emitting electrode of the PNP type triode Q3 is connected with one end of a voltage VCC and a resistor R3, a base electrode is connected with a collecting electrode of an NPN type triode Q2, a collecting electrode is connected with one end of a resistor R4, the other end of the resistor R3 is connected with the other end of a resistor R4 and then is connected with an emitting electrode of a PNP type triode Q1, a base electrode of the PNP type triode Q1 is connected with the voltage VCC, a collecting electrode is connected with a gas meter, a base electrode of the NPN type triode Q2 is connected with an MCU single chip controller, one end of the emitting electrode of the NPN type triode Q2 is connected with the base electrode of the NPN.
The resistance R3=174 Ω, the resistance R4=43 Ω.
The base electrode of the NPN type triode Q1 is connected with the cathode of a diode D2, the anode of the diode D2 is connected with the cathode of a diode D3, and the anode of the diode D3 is connected with a voltage VCC.
The collector of the NPN type triode Q1 is connected with the anode of a diode D1, and a fuse F1 and a resistor R1 are connected between the cathode of the diode D1 and the gas meter.
A voltage regulator diode TVI, TV2 and TV3 are connected in parallel between the collector of the NPN transistor Q1 and the emitter of the NPN transistor Q2.
Still include the circuit power supply, the circuit power supply obtains 12V, 5V and 3.3V's direct current voltage with the 220V alternating current through AD/DC converting circuit, 12V provides voltage for the VCC, 5V provides voltage for gas sensor, 3.3V provides voltage for MCU single chip controller.
The XmA =20mA and Y =4 mA.
The beneficial effect of this application is.
1. The output signal is a two-wire three-state switch signal, 4mA represents that the alarm is connected but not in an alarm state, and 20mA represents that the alarm is connected and in an alarm state; 0mA represents a broken wire state or an unconnected state of the alarm, whether the alarm is in a normal working state or not is convenient to detect, the connected state of the alarm is maintained through 4mA low current under the condition that no alarm is available, remote signal transmission is achieved, a two-wire active current signal is adopted, the active current signal has the strongest anti-interference capacity, and meanwhile, the two-wire current signal can transmit analog quantity, digital quantity, multi-state switching quantity and the like.
2. Through resistance-type semiconductor metal oxide (SnO 2) formula sensor, the essential element of sensor is gas sensitive resistor and heat tracing circuit, and heat tracing circuit is gas sensitive resistor heating for gas sensitive resistor obtains stable operating temperature condition, and gas sensitive resistor adsorbs reductive gases such as CH4 and makes it take place oxidation reaction, thereby changes gas sensitive resistor's resistance value, and gas sensitive resistor connects in series the fixed resistance, on being connected to the power, exports the voltage signal value that corresponds with gas concentration.
3. D1, F1, R1, TV1, TV2 and TV3 form a Zener safety gate circuit to ensure that the voltage and current values of output signals meet safety requirements, three voltage stabilizing diodes of TV1, TV2 and TV3 are used in parallel, and the output voltage can be ensured not to exceed 13V (the specification of the voltage stabilizing diodes is 13V) even if two voltage stabilizing diodes are in failure.
Drawings
Fig. 1 is a functional block diagram of the circuit of the present invention.
Fig. 2 is a schematic structural diagram of the gas sensor of the present invention.
Fig. 3 is a circuit diagram of a two-wire three-state switch signal implementation of the present invention.
Fig. 4 is a power supply circuit diagram of the present invention.
The reference numbers in the figures are: 1. gas sensor, 2, MCU monolithic controller, 3, essence signal output circuit.
Detailed Description
Example 1
As shown in fig. 1 to 4, an alarm device for an internet of things intelligent gas meter comprises a gas sensor 1, an MCU monolithic controller 2 and an essential signal output circuit 3:
the gas sensor 1 is used for sending a detection concentration signal of leaked gas to the MCU 2;
the MCU 2 is used for sending a level signal to trigger the intrinsic signal output circuit 3 after the gas concentration reaches a set threshold value;
the intrinsic signal output circuit outputs a current signal to the gas meter;
when the MCU monolithic controller 2 determines that the concentration of the gas transmitted by the gas sensor 1 is greater than a preset threshold value, the MCU monolithic controller 2 triggers an output level signal to trigger the essential signal output circuit 3 to output XmA current so as to send an alarm signal, and the gas meter closes a valve after receiving the alarm signal;
when the MCU singlechip controller 2 determines that the gas concentration transmitted by the gas sensor 1 is smaller than a preset threshold value, the MCU singlechip controller 2 does not output a level signal, and the essential signal output circuit 3 outputs YmA current to detect that the alarm works normally.
The intrinsic signal output circuit 3 comprises a PNP type triode Q3, an emitter of the PNP type triode Q3 is connected with one end of a voltage VCC and one end of a resistor R3, a base is connected with a collector of an NPN type triode Q2, a collector is connected with one end of a resistor R4, the other end of the resistor R3 is connected with an emitter of a PNP type triode Q1 after being connected with the other end of a resistor R4, a base of the PNP type triode Q1 is connected with the voltage VCC, the collector is connected with a gas meter, a base of the NPN type triode Q2 is connected with the MCU single chip controller 2, one end of the emitter of the NPN type triode Q2 is connected with the base of the NPN type triode Q1, then the.
The resistance R3=174 Ω, the resistance R4=43 Ω.
The base electrode of the NPN type triode Q1 is connected with the cathode of a diode D2, the anode of the diode D2 is connected with the cathode of a diode D3, and the anode of the diode D3 is connected with a voltage VCC.
The collector of the NPN type triode Q1 is connected with the anode of a diode D1, and a fuse F1 and a resistor R1 are connected between the cathode of the diode D1 and the gas meter.
A voltage regulator diode TVI, TV2 and TV3 are connected in parallel between the collector of the NPN transistor Q1 and the emitter of the NPN transistor Q2.
The XmA =20mA and Y =4 mA.
Still include the circuit power supply, the circuit power supply obtains 12V, 5V and 3.3V's direct current voltage with the 220V alternating current through AD/DC converting circuit, 12V provides voltage for the VCC, 5V provides voltage for gas sensor 1, 3.3V provides voltage for MCU monolithic controller 2.
The voltage at the two ends of the resistor R3 is clamped at about 0.7V, when the resistor R3 is 174 omega, the current flowing through the resistor R3 is about 4mA, at the moment, if no alarm is output, the PNP type triode Q3 is cut off, and when the output loop is switched on, the output current, namely the current flowing through the resistor R3 is about 4 mA; the alarm is connected but not in an alarm state, when the gas sensor 1 detects that the gas concentration is higher than a set alarm point, the MCU single chip controller emits high voltage to enable the NPN type triode Q2 to be conducted, so that the PNP type triode Q3 is conducted, at the moment, current passes through the resistor R4, the voltage at two ends of the resistor R4 is equal to the voltage at two ends of the resistor R3 and is about 0.7V, when the resistor R4 is 43 omega, the current flowing through the resistor R4 is about 16mA, when an output circuit is connected, the sum of the currents flowing through the resistor R3 and the resistor R4 is about 20mA, the alarm is connected and in an alarm state, and the gas meter is automatically closed to cut off gas leakage.
The output signal is a two-wire three-state switch signal, 4mA represents that the alarm is connected but not in an alarm state, and 20mA represents that the alarm is connected and in an alarm state; 0mA represents a broken wire state or an unconnected state of the alarm, whether the alarm is in a normal working state or not is convenient to detect, the connected state of the alarm is maintained through 4mA low current under the condition that no alarm is available, remote signal transmission is achieved, a two-wire active current signal is adopted, the active current signal has the strongest anti-interference capacity, and meanwhile, the two-wire current signal can transmit analog quantity, digital quantity, multi-state switching quantity and the like.
Through resistance-type semiconductor metal oxide (SnO 2) formula sensor, the essential element of sensor is gas sensitive resistor and heat tracing circuit, and heat tracing circuit is gas sensitive resistor heating for gas sensitive resistor obtains stable operating temperature condition, and gas sensitive resistor adsorbs reductive gases such as CH4 and makes it take place oxidation reaction, thereby changes gas sensitive resistor's resistance value, and gas sensitive resistor connects in series the fixed resistance, on being connected to the power, exports the voltage signal value that corresponds with gas concentration.
D1, F1, R1, TV1, TV2 and TV3 form a Zener safety gate circuit to ensure that the voltage and current values of output signals meet safety requirements, three voltage stabilizing diodes of TV1, TV2 and TV3 are used in parallel, and the output voltage can be ensured not to exceed 13V (the specification of the voltage stabilizing diodes is 13V) even if two voltage stabilizing diodes are in failure.
In the description of the present invention, it should be noted that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (8)
1. The utility model provides an thing networking intelligent gas table alarm device, includes gas sensor (1), MCU monolithic controller (2) and essential signal output circuit (3), its characterized in that:
the gas sensor (1) is used for sending a detection concentration signal of leaked gas to the MCU (microprogrammed control Unit) single chip controller (2);
the MCU (MCU) single chip controller (2) is used for sending a level signal to trigger the intrinsic signal output circuit (3) after the gas concentration reaches a set threshold value;
and the intrinsic signal output circuit outputs the current signal to the gas meter.
2. The alarm device of the internet of things intelligent gas meter according to claim 1, wherein: gas sensor (1) includes heating element and gas resistance, be provided with heating resistor between the electrode terminal A of sensor and the electrode terminal B, direct current voltage 5V is connected to the electrode terminal A and the electrode terminal C of sensor, the electrode terminal B of sensor holds the one end of connecting resistance R1, resistance R1's the other end and heating resistor D ground connection, the electrode terminal B of sensor is connected with MCU monolithic controller.
3. The alarm device of the internet of things intelligent gas meter according to claim 2, characterized in that: the intrinsic signal output circuit (3) comprises a PNP type triode Q3, an emitter of the PNP type triode Q3 is connected with one end of a voltage VCC and one end of a resistor R3, a base is connected with a collector of an NPN type triode Q2, a collector is connected with one end of a resistor R4, the other end of the resistor R3 is connected with an emitter of the PNP type triode Q1 after being connected with the other end of a resistor R4, a base of the PNP type triode Q1 is connected with the voltage VCC, the collector is connected with a gas meter, a base of the NPN type triode Q2 is connected with an MCU single chip controller (2), one end of the emitter of the NPN type triode Q2 is connected with the base of the NPN type triode Q1, then the.
4. The alarm device of the internet of things intelligent gas meter according to claim 3, wherein: the resistance R3=174 Ω, the resistance R4=43 Ω.
5. The alarm device of the internet of things intelligent gas meter according to claim 3, wherein: the base electrode of the NPN type triode Q1 is connected with the cathode of a diode D2, the anode of the diode D2 is connected with the cathode of a diode D3, and the anode of the diode D3 is connected with a voltage VCC.
6. The alarm device of the internet of things intelligent gas meter according to claim 3, wherein: the collector of the NPN type triode Q1 is connected with the anode of a diode D1, and a fuse F1 and a resistor R1 are connected between the cathode of the diode D1 and the gas meter.
7. The alarm device of the internet of things intelligent gas meter according to claim 3, wherein: a voltage regulator diode TVI, TV2 and TV3 are connected in parallel between the collector of the NPN transistor Q1 and the emitter of the NPN transistor Q2.
8. The alarm device of the internet of things intelligent gas meter according to claim 1, wherein: still include the circuit power supply, the circuit power supply obtains 12V, 5V and 3.3V's direct current voltage with the 220V alternating current through AD/DC converting circuit, 12V provides voltage for VCC, 5V provides voltage for gas sensor (1), 3.3V provides voltage for MCU monolithic controller (2).
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| CN202021483003.2U CN212845154U (en) | 2020-07-24 | 2020-07-24 | Thing networking intelligent gas table alarm device |
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| CN202021483003.2U CN212845154U (en) | 2020-07-24 | 2020-07-24 | Thing networking intelligent gas table alarm device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295344A (en) * | 2021-04-28 | 2021-08-24 | 成都秦川物联网科技股份有限公司 | Method for detecting gas leakage by ultrasonic wave |
| CN114324478A (en) * | 2022-01-05 | 2022-04-12 | 慕思健康睡眠股份有限公司 | Liquid leakage detection device and system |
-
2020
- 2020-07-24 CN CN202021483003.2U patent/CN212845154U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295344A (en) * | 2021-04-28 | 2021-08-24 | 成都秦川物联网科技股份有限公司 | Method for detecting gas leakage by ultrasonic wave |
| CN113295344B (en) * | 2021-04-28 | 2023-03-24 | 成都秦川物联网科技股份有限公司 | Method for detecting gas leakage by ultrasonic wave |
| CN114324478A (en) * | 2022-01-05 | 2022-04-12 | 慕思健康睡眠股份有限公司 | Liquid leakage detection device and system |
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