CN201724920U - Gas leakage alarm device - Google Patents
Gas leakage alarm device Download PDFInfo
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- CN201724920U CN201724920U CN2010202638635U CN201020263863U CN201724920U CN 201724920 U CN201724920 U CN 201724920U CN 2010202638635 U CN2010202638635 U CN 2010202638635U CN 201020263863 U CN201020263863 U CN 201020263863U CN 201724920 U CN201724920 U CN 201724920U
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Abstract
The utility model discloses a gas leakage alarm device, which comprises a gas concentration detection module, a CPU module, a power module and a communication module. The gas concentration detection module includes a sensor, the resistance value of the sensor increases along with rising of gas concentration, and one end of the sensor is grounded while the other end is connected in series with a reference resistor and connected with a transistor via the reference resistor. A control electrode of the transistor is connected with an output end of an operational amplifier, and other two electrodes of the transistor are connected between the reference resistor and a constant-voltage power supply. An in-phase input end of the operational amplifier is connected with a reference power supply, and an inverting input end of the operational amplifier is connected with the sensor and an intermediate node of the reference resistor. The transistor and the intermediate node of the reference resistor are connected with the CPU module to output voltage signals for the CPU module to determine the gas concentration, and the CPU module is in data interchange with a monitoring center via the communication module. The gas leakage alarm device can protect sensor elements and guarantee accuracy of detection results by designing a constant-voltage low-temperature gas concentration detection circuit.
Description
Technical field
The utility model belongs to the gas detection equipment technical field, specifically, relates to a kind of methane content that is used for detected gas, to judge whether to take place the gas leakage alarm device of gas leakage accident.
Background technology
Methane (CH4) combustion gas is flammable, explosiveness gas, easily causes great harm by the accident of its initiation.The generation of fuel gas buring, blast will possess 3 conditions: (1) concentration: generally easily blast between 5%～16%; (2) flach point: temperature is between 650～750 ℃; (3) Chong Zu oxygen: oxygen concentration is greater than 12%.Therefore, the accurate detection of gas concentration just becomes and effectively prevents and avoid causing the key issue of methane blast because of methane concentration transfinites.
At present, the method for detection gas concentration has a variety of, as radiant heat method, infrared spectrum Y-factor method Y, optical interferometry, ultrasonic Method for Measuring, gas sensory method, thermal barrier catalysis element detection method etc.The sensor that present stage is domestic to be used to detect the methane gas concentration mainly is to adopt thermal barrier catalysis element detection method, this class component has adopted modular design, it is little to have volume, the intrinsic safety height, characteristics such as good stability, therefore, be widely used in the circuit design of present gas leakage alarm device.
For existing gas leakage alarm device, its gas concentration testing circuit adopts usually based on the sensor of thermal barrier catalysis element forms resistance bridge, this element internal is core with the platinum filament, outside is carrier with the aluminium oxide, scribbles catalyzer on the carrier, when platinum filament is in the gas that contains methane by certain electric current and element, the surface can produce flameless burning, platinum filament resistance Yin Wendu is increased and increase, the bridge circuit out of trim, thus export a potential difference (PD).This potential difference (PD) within the specific limits, its size is directly proportional with the concentration of methane, so by gathering the content that this current potential extent can obtain methane in the current gas.Because this sensor, its inner catalysis element is under the bump of high concentration gas, active meeting is destroyed, and concentration is high more, destructiveness is big more, therefore, causes sensor shorter serviceable life, and just can occur the situation of indeterminacy gas concentration in use for some time, and then cause pick-up unit the situation of false alarm to occur.
The utility model content
The utility model is in order to solve the existing gas concentration testing circuit that adopts the resistance bridge structural design; the problem that the catalysis element of its sensor internal is vulnerable to destroy; a kind of gas leakage alarm device that adopts brand-new testing circuit structural design is provided; guaranteeing under the prerequisite that gas concentration accurately detects; effectively protect thermal barrier catalysis element activity under high concentration gas not to be destroyed, and then prolonged the serviceable life of sensor.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of gas leakage alarm device comprises gas concentration detection module, CPU module, power module and communication module; In described gas concentration detection module, include a sensor that resistance increases with the rising of gas concentration, described sensor one end ground connection, other end series connection reference resistance, and by reference resistance connection transistor; The described transistorized control utmost point connects the output terminal of an operational amplifier, and the two poles of the earth are connected between reference resistance and the constant voltage source in addition; The in-phase input end of described operational amplifier connects reference power supply, and inverting input connects the intermediate node of described sensor and reference resistance; The intermediate node of described transistor AND gate reference resistance connects the CPU module, and output voltage signal is judged gas concentration for the CPU module, and described CPU module connects communication module, carries out data interaction by communication module and Surveillance center.
Preferably, described transistor is a NPN type triode, the output terminal of the base stage concatenation operation amplifier of described triode, and collector connects constant voltage source, and emitter connects reference resistance.
Certainly, described transistor also can adopt the N-channel MOS pipe to carry out circuit design, and with the output terminal of the grid concatenation operation amplifier of described metal-oxide-semiconductor, drain electrode connects constant voltage source, and source electrode connects reference resistance.
Further, described sensor is the sensor based on the thermal barrier catalysis element.
In order to realize that the voltage signal of described gas concentration detection module output is carried out processing and amplifying, the intermediate node of described transistor AND gate reference resistance at first connects an operational amplification circuit, connects described CPU module by described operational amplification circuit.
In order to reach energy-conservation purpose of design, in described power module, be provided with battery and power management module, the power input of described power management module connects battery, control end connects the CPU module, the multiple power supplies output terminal respectively with described gas concentration detection module, the CPU module is corresponding with communication module is connected.When the CPU module enters dormant state, can be by the power supply of power management module cut-out, to cut down the consumption of energy to described gas concentration detection module and communication module.
Further again, crash in order to prevent CPU, preferably described CPU module is connected with watchdog circuit.
Further again, described gas leakage alarm device is provided with at least one road serial ports, and described serial ports is connected with the CPU module, is connected communication with peripheral hardware with convenient described gas leakage alarm device.
Further, described communication module is the wireless communication module based on wireless-transmission network.
Preferably, described wireless communication module is the GPRS wireless communication module.
Compared with prior art; advantage of the present utility model and good effect are: gas leakage alarm device circuit of the present utility model is simple in structure; gas concentration testing circuit by design constant pressure cryogenic degree; can effectively protect sensor element; it is worked under the environment of combustion gas high concentration also can not destroy the activity of its catalysis element; thereby prolonged its serviceable life, made testing result more accurate, system's operation is stable more, reliable.
After reading the detailed description of the utility model embodiment in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the internal circuit theory diagram of the gas leakage alarm device that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of gas concentration detection module among Fig. 1;
Fig. 3 is the schematic block circuit diagram of a kind of embodiment of power module among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.
Embodiment one, and referring to shown in Figure 1, the gas leakage alarm device of present embodiment mainly partly is made up of gas concentration detection module, CPU module, power module and communication module etc.Wherein, the gas concentration detection module sensor that adopts its resistance to increase with the rising of the gas concentration constant pressure cryogenic testing circuit that cooperates simple peripheral circuit to form is realized the detection to gas concentration; The CPU module is the control core of whole device, by gathering the voltage signal of gas concentration detection module output, judges whether the gas content in the current gas transfinites, and when transfiniting, in time produce alerting signal, transfer to Surveillance center, alarm by communication module; Power module is responsible in the device each and provides required operating voltage with electric loading.
Present embodiment is the concrete establishment structure that example illustrates described constant pressure cryogenic testing circuit with the sensor based on the thermal barrier catalysis element, referring to shown in Figure 2.With described sensor R2 one end ground connection, other end series connection reference resistance R1, and by reference resistance R1 connection transistor V1, and then by transistor V1 connection constant voltage source Vcc.Described transistor V1 can be a triode, also can be the on-off element that metal-oxide-semiconductor etc. has amplification characteristic, and present embodiment is that example describes with NPN type triode.As shown in Figure 2, the emitter with NPN type triode V1 connects reference resistance R1, collector connection constant voltage source Vcc, the output terminal of base stage concatenation operation amplifier U1.With the inverting input of operational amplifier U1-be connected to the intermediate node place of reference resistance R1 and sensor R2, the in-phase input end of operational amplifier U1+connection reference power supply Vref.
When sensor R2 was in the gas that contains methane, its inner platinum filament surface can produce flameless burning, so make platinum filament resistance Yin Wendu rising and increase, promptly the resistance of sensor R2 raises.At this moment, the voltage difference at sensor R2 two ends has trend of rising, transfers to after operational amplifier U1 and reference power supply Vref compare, and makes that the voltage magnitude by operational amplifier U1 output reduces.Because the NPN type triode V1 of this moment is operated in the amplification region; therefore; the amplitude of voltage signal Vo by the output of its emitter reduces; the electric current that flows through reference resistance R1 and sensor R2 reduces; and then the voltage difference that makes sensor R2 two ends keeps constant; avoid the rising of platinum filament temperature, the effect that just played effective protection sensor R2 element thus, prolongs its serviceable life.
Meanwhile, the amplitude size of the voltage signal Vo of the emitter output by NPN type triode V1 just with the gas concentration relation of being inversely proportional to, so, can judge the size of gas concentration indirectly by the amplitude size of detectable voltage signals Vo.To transfer to the CPU module by the voltage signal Vo of gas concentration detection module output, resolving to the detection data of reflection gas concentration content, and then be sent to Surveillance center, show by communication module.
When the CPU module detects gas concentration and transfinites, can send alerting signal to Surveillance center by communication module, carry out that height is alert to be reminded.
Certainly, also can adopt the N-channel MOS pipe to replace described NPN type triode V1, only need the grid of metal-oxide-semiconductor is connected to the output terminal of operational amplifier U1, drain electrode connects constant voltage source Vcc, source electrode connects reference resistance R1 and gets final product, and present embodiment is not limited in above giving an example.
Can transmit exactly in the line in order to ensure voltage signal Vo by described gas concentration detection module output, present embodiment preferably further is provided with operational amplification circuit between the output terminal of gas concentration detection module and CPU module, as shown in Figure 1, after by operational amplification circuit the voltage signal Vo of gas concentration detection module output being carried out the backward difference processing and amplifying, transfer to the CPU module again, so not only can prevent voltage signal in transmission course because of being subjected to the influence of undesired signal, and cause the CPU module to make false judgment, and can make the voltage signal size that is input to the CPU module proportional, thereby strengthened the accuracy of warning device testing result more with the gas concentration content that current detection arrives.
In order to reach energy savings, prolong the gas leakage alarm device purpose of design of working time, present embodiment has carried out specialized designs to the power module in the device, change traditional out-of-control power supply mode, and adopt power management module to come the electric energy output of battery is controlled, as shown in Figure 3.The power input of power management module is connected with battery, the direct supply Vin that battery is exported by power management module converts the output of multi-channel DC voltage to, such as Vout1, Vout2......, be respectively the electricity consumption electric in the device, such as electric loading such as gas concentration detection module, CPU module, communication module.The control end of power management module connects the CPU module, after warning device start operation, the CPU module is at first exported control signal, and the control power management module is exported each road DC voltage, for each the electricity consumption electric in the device, carry out the detection of gas concentration and the transmission of testing result.If it is lower that the CPU module detects current gas concentration, then determine long dormancy time, and output control signals to power management module, the control power management module cuts off the power supply to gas concentration detection module, operational amplification circuit and communication module, only the supply voltage of CPU standby operation is kept in output, control system enters dormant state, to cut down the consumption of energy.Then, the CPU module is carried out timing to dormancy time, behind the dormancy time of arrive setting, outputs control signals to power management module, controls it and exports each road DC voltage again, to wake each up with the electric loading operation that powers on, current gas concentration is detected.Described CPU module compares according to the ultimate value of detected gas concentration content and setting, and difference is big more, and the dormancy time of setting is long more; Difference is more little, and then the dormancy time of She Dinging is short more; During near the ultimate value set, the control power management module is continuously each electricity consumption electric up to detected gas concentration, with when gas concentration transfinites, can very first time output alarm signal, and alarm to Surveillance center.
Adopt this power supply design can be so that the energy consumption of whole device significantly reduces, thereby longer in the following working time of battery powered situation, the trouble of having avoided the staff frequently to change battery being caused have been saved the energy.
The CPU module of present embodiment changes tradition and adopts two single-chip microcomputers to carry out complete machine control, a Single-chip Controlling communication module part, the another one single-chip microcomputer is responsible for the acquisition tasks of concentration signal, two single-chip microcomputers intercom mutually and finish the design of complete machine control, and adopt single single-chip microcomputer to finish the unified control of complete machine, so that circuit structure is compact more, succinct.The single-chip microcomputer that present embodiment adopted is supported jtag port emulation and programming, and hyperchannel 10 bit A/D converters can satisfy the requirement of the precision and the resolution of most of test macro.Built-in EEPROM memory can be preserved significant data when system's power down.Referring to shown in Figure 1, also be provided with watchdog circuit in the periphery of described single-chip microcomputer, software adopts the state machine programming mode can reach system and never crashes.
In addition, warning device is connected communication with peripherals for convenience, and present embodiment also is provided with at least one road serial ports on the housing of warning device, as shown in Figure 1, with the two-way serial ports is example, connects the IO mouth or the serial ports of single-chip microcomputer, to realize the data interaction between warning device and the peripheral hardware.Such as by peripheral hardware the software program of warning device inside being upgraded, perhaps the gas concentration that writes down in the warning device being detected data, to download to peripheral hardware medium.
In the present embodiment, communication module can adopt wire transmission mode, also can adopt wireless transmission method.Present embodiment is that example describes to adopt wireless transmission method, the mode that specifically can adopt the wireless communication module based on wireless-transmission networks such as GPRS, CDMA, GSM to be connected with the CPU module is come the constructing system circuit, as shown in Figure 1, by wireless communication module the concentration testing result of CPU module output or alerting signal are sent to the Surveillance center of far-end in the mode of radio communication, to realize centralized displaying to concentration overload alarm information.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection domain of the present utility model.
Claims (10)
1. a gas leakage alarm device comprises gas concentration detection module, CPU module, power module and communication module; It is characterized in that: in described gas concentration detection module, include a sensor that resistance increases with the rising of gas concentration, described sensor one end ground connection, other end series connection reference resistance, and by reference resistance connection transistor; The described transistorized control utmost point connects the output terminal of an operational amplifier, and the two poles of the earth are connected between reference resistance and the constant voltage source in addition; The in-phase input end of described operational amplifier connects reference power supply, and inverting input connects the intermediate node of described sensor and reference resistance; The intermediate node of described transistor AND gate reference resistance connects the CPU module, and output voltage signal is judged gas concentration for the CPU module, and described CPU module connects communication module, carries out data interaction by communication module and Surveillance center.
2. gas leakage alarm device according to claim 1 is characterized in that: described transistor is a NPN type triode, the output terminal of the base stage concatenation operation amplifier of described triode, and collector connects constant voltage source, and emitter connects reference resistance.
3. gas leakage alarm device according to claim 1 is characterized in that: described transistor is the N-channel MOS pipe, the output terminal of the grid concatenation operation amplifier of described metal-oxide-semiconductor, and drain electrode connects constant voltage source, and source electrode connects reference resistance.
4. gas leakage alarm device according to claim 1 is characterized in that: described sensor is the sensor based on the thermal barrier catalysis element.
5. according to each described gas leakage alarm device in the claim 1 to 4, it is characterized in that: the intermediate node of described transistor AND gate reference resistance connects an operational amplification circuit, connects described CPU module by described operational amplification circuit.
6. according to each described gas leakage alarm device in the claim 1 to 4, it is characterized in that: in described power module, comprise battery and power management module, the power input of described power management module connects battery, control end connects the CPU module, the multiple power supplies output terminal respectively with described gas concentration detection module, the CPU module is corresponding with communication module is connected.
7. gas leakage alarm device according to claim 5 is characterized in that: described CPU module is connected with watchdog circuit.
8. gas leakage alarm device according to claim 7 is characterized in that: described gas leakage alarm device is provided with at least one road serial ports, and described serial ports is connected with the CPU module.
9. according to each described gas leakage alarm device in the claim 1 to 4, it is characterized in that: described communication module is the wireless communication module based on wireless-transmission network.
10. gas leakage alarm device according to claim 9 is characterized in that: described wireless communication module is the GPRS wireless communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202638635U CN201724920U (en) | 2010-07-15 | 2010-07-15 | Gas leakage alarm device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202638635U CN201724920U (en) | 2010-07-15 | 2010-07-15 | Gas leakage alarm device |
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| CN201724920U true CN201724920U (en) | 2011-01-26 |
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| CN2010202638635U Expired - Fee Related CN201724920U (en) | 2010-07-15 | 2010-07-15 | Gas leakage alarm device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529090A (en) * | 2013-10-24 | 2014-01-22 | 沈阳添瀛通用设备有限公司 | Portable methane detection alarm |
| CN103632519A (en) * | 2012-08-29 | 2014-03-12 | 胡燕祝 | Combustible gas leakage monitoring and remote meter reading system |
| CN110953729A (en) * | 2019-12-17 | 2020-04-03 | 华帝股份有限公司 | Control method of gas water heater |
-
2010
- 2010-07-15 CN CN2010202638635U patent/CN201724920U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632519A (en) * | 2012-08-29 | 2014-03-12 | 胡燕祝 | Combustible gas leakage monitoring and remote meter reading system |
| CN103529090A (en) * | 2013-10-24 | 2014-01-22 | 沈阳添瀛通用设备有限公司 | Portable methane detection alarm |
| CN110953729A (en) * | 2019-12-17 | 2020-04-03 | 华帝股份有限公司 | Control method of gas water heater |
| CN110953729B (en) * | 2019-12-17 | 2021-09-17 | 华帝股份有限公司 | Control method of gas water heater |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: QINGDAO JERRY INDUSTRIAL TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: QINGDAO JARI AUTOMATION CO., LTD. Effective date: 20150727 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150727 Address after: 266071 Shandong Province, Qingdao city Shandong Road No. 27 East Building Room 101 Patentee after: QINGDAO JARI INDUSTRIAL CONTROL TECHNOLOGY CO., LTD. Address before: 266071 Shandong city of Qingdao province Shandong East Road No. 27 Patentee before: Qingdao Jari Automation Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110126 Termination date: 20150715 |
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| EXPY | Termination of patent right or utility model |