CN204515991U - A kind of novel gas alarm - Google Patents
A kind of novel gas alarm Download PDFInfo
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- CN204515991U CN204515991U CN201520116239.5U CN201520116239U CN204515991U CN 204515991 U CN204515991 U CN 204515991U CN 201520116239 U CN201520116239 U CN 201520116239U CN 204515991 U CN204515991 U CN 204515991U
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Abstract
The utility model discloses a kind of novel gas alarm, it is characterized in that: comprise central processing unit, power circuit, gas detection sensor, signal conditioning circuit, key circuit, display circuit and warning circuit, power circuit is connected with central processing unit, gas detection sensor, signal conditioning circuit, gas detection sensor output terminal is connected with signal conditioning circuit, signal conditioning circuit output terminal is connected with central processing unit, and central processing unit is connected with key circuit, display circuit and warning circuit.The utility model global design volume is little, peripheral circuit simple, reduce system power dissipation, antijamming capability is strong.Not only can be applied to home alarm, and be easy to be expanded into intelligent residential district monitoring platform, have very wide market application foreground.
Description
Technical field
The utility model relates to coal gas detection technical field, especially relates to a kind of novel gas alarm.
Background technology
Along with the change of China's combustion gas and the carrying out of West-East National Gas Transmission Project, coal gas or rock gas have become the fuel of most family.In the gas poisoning caused because of gas leak every year, because all there are many examples in the anthracemia accident whole nation using water heater quality problems that are improper or product itself to cause.What is more, causes that the accident of gas explosion is quite a few sees because indoor gas concentration is too high.So, guard against gas poisoning like this with explode become people in the urgent need to.Household gas warner especially at present needed for because it is more simple to use, facilitate resident living.
And the research and development of gas alarm are also vital for preventing coal mining accident, according to authoritative department statistics, only last year, coal mining accident death toll was just up to 3786 people, also result in huge economic loss simultaneously.The especially big coal mining accident of China is also very serious, such as in Dec, 2005, and great especially gas and dust explosion accident occurs Liu Guantun colliery, Tangshan, and cause 108 miner's death, 29 people are injured, direct economic loss more than 4,800 ten thousand yuan.On September 1 the same year, there is gas explosion accident in defendance colliery, Shuangyashan Mining Administration of Heilongjiang Province east, 14 people are wrecked.September 5, there is especially big gas explosion accident in colliery, the village, Mining Group company Yongding, Datong, Shanxi Province, dead 31 people.September 27, there is especially big pernicious gas explosion accident in waterside town mineral bureau of Guizhou Province wood coombe colliery, 162 people are dead.This is a coal mining accident the most serious over nearly 40 years.November 5, The Small Well generation gas explosion accident is done in ore deposit, ore deposit, Liaoyuan, Jilin province mineral bureau Xi'an, and dead 31 people, cause serious financial consequences.November 25, there is especially big gas explosion in Inner Mongolia Autonomous Region wild goose coal industry company two ore deposit coal-face, and found that 14 people are dead at present, 37 people are missing.
No matter alarm is in daily life as can be seen here; or in the commercial production such as colliery, all play vital effect; so the inflammable gas in real-time Measurement accuracy surrounding environment; toxic and harmful is revealed, significant to the healthy and property safety of the protection people.In many fields of national economy, as being widely used in the enterprises such as oil field, mine, chemical industry and family, be also the big event of environmental protection.How to develop device that is reliable and stable, high performance price ratio, become the problem being badly in need of solving.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, provides a kind of novel gas alarm, the utility model global design volume is little, peripheral circuit is simple, reduce system power dissipation, antijamming capability is strong.Not only can be applied to home alarm, and be easy to be expanded into intelligent residential district monitoring platform, have very wide market application foreground.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of novel gas alarm, it is characterized in that: comprise central processing unit, power circuit, gas detection sensor, signal conditioning circuit, key circuit, display circuit and warning circuit, described power circuit and central processing unit, gas detection sensor, signal conditioning circuit connects, described gas detection sensor output terminal is connected with signal conditioning circuit, described signal conditioning circuit output terminal is connected with central processing unit, described central processing unit and key circuit, display circuit is connected with warning circuit.
Above-mentioned a kind of novel gas alarm, is characterized in that: described power circuit is the power circuit based on TPS79533 low pressure voltage stabilizer.
Above-mentioned a kind of novel gas alarm, is characterized in that: described gas detection sensor adopts catalytic combustion method gas sensor TGS6812.
Above-mentioned a kind of novel gas alarm, is characterized in that: described signal conditioning circuit is based on the adjustable amplifying circuit of the differential gain of LM158.
Above-mentioned a kind of novel gas alarm, is characterized in that: the charactron that described display circuit is 3 74LS164 shift register chips and is connected with each shift register chip.
Above-mentioned a kind of novel gas alarm, is characterized in that: described warning circuit adopts the voice alarm circuit based on ISD1110 speech chip.
The utility model compared with prior art has the following advantages:
The utility model global design volume is little, peripheral circuit simple, reduce system power dissipation, antijamming capability is strong.Not only can be applied to home alarm, and be easy to be expanded into intelligent residential district monitoring platform, have very wide market application foreground.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is fuel gas alarm one-piece construction block diagram of the present utility model;
Fig. 2 is power circuit circuit theory diagrams of the present utility model;
Fig. 3 is gas detection sensor inner structure block diagram of the present utility model;
Fig. 4 is gas detection sensor of the present utility model and signal conditioning circuit circuit theory diagrams.
Embodiment
As shown in Figure 1, a kind of novel gas alarm, it is characterized in that: comprise central processing unit 1, power circuit 2, gas detection sensor 3, signal conditioning circuit 4, key circuit 5, display circuit 6 and warning circuit 7, described power circuit 2 is connected with central processing unit 1, gas detection sensor 3, signal conditioning circuit 4, described gas detection sensor 3 output terminal is connected with signal conditioning circuit 4, described signal conditioning circuit 4 output terminal is connected with central processing unit 1, and described central processing unit 1 is connected with key circuit 5, display circuit 6 and warning circuit 7.
In the present embodiment, described power circuit 2 is the power circuit based on TPS79533 low pressure voltage stabilizer.Physical circuit as shown in Figure 2, power module mainly exports 3.3V voltage by TPS79533 low pressure voltage stabilizer, its input voltage range is 2.7 ~ 5.5V, and has higher Power Supply Rejection Ratio, ultra-low noise, preferably voltage linear and load transient effect and less voltage drift.This power module adopts 5V direct supply directly to power, by voltage stabilizer voltage stabilizing to 3.3V, also can be powered by USB, if as front end node or be subject to such environmental effects, not easily in electrical equipment situation, 3 joint dry cell power supplies also can be adopted, in 3 kinds of simultaneous situations of power supply, circuit directly can be input as power supply with ceiling voltage, and other are conductively-closed then.This circuit has merged the application of 3 kinds of power supplys, and node is in all case arbitrarily placed.Change 3.3V operating voltage by TPS79533: the shunt capacitance of 0.1 μ F and 47 μ F parallel connections on increasing between input and GND, the electric capacity Absorbable organic halogens of 47 μ F exports, and makes incoming level more level and smooth.The small capacitances of 0.1 μ F is connected with GND, provides a path over the ground to high-frequency signal.Like this, larger filtering frequency range can be obtained by the parallel connection of 0.1 μ F and 47 μ F, two electric capacity as shunt capacitance, strengthen stability, improve noise and Ripple Suppression.Equally, between output with GND, also to increase same shunt capacitance, make output more stable, and can obtain and stablize pure voltage and export.Noise due to the internal reference voltage of voltage stabilizer is the main source of the noise of voltage stabilizer own.The PASS pin of TPS79 533 is connected on reference voltage by a 250k Ω resistance.The electric capacity of the 0.01 μ F that the resistance of so inner 250k Ω connects together with outside forms a low-pass filter to reduce noise and the output noise of reference voltage.
In the present embodiment, described gas detection sensor 3 adopts catalytic combustion method gas sensor TGS6812.TGS6812 is applicable to detect the inflammable gas such as hydrogen, methane and liquefied petroleum gas (LPG), sensor accuracy is high, durable, reliable and stable, response fast and the superperformance of linear convergent rate.So TGS6812 is the good solution detecting domestic gas, its inner general configuration block diagram as shown in Figure 3.TGS6812 is by the element D of inflammable gas sensitivity and form the insensitive reference element C of inflammable gas.When inflammable gas exists, will burn, and cause temperature to rise on D detecting element, the resistance of D element will increase, thus makes that output voltage is corresponding to be changed.Measure this magnitude of voltage, can in the hope of the concentration of inflammable gas by calculating.
In the present embodiment, described signal conditioning circuit 4 is based on the adjustable amplifying circuit of the differential gain of LM158.When in atmosphere, be subject to the impact of environment temperature, sensor also has offset output, so application LM158 designs the amplifying circuit of differential adjustable gain to suppress zero point drift, specific design circuit as shown in Figure 4.By regulating deflection machine R4, being input as 0 by the differential of the differential amplifier circuit formed with LM158 after making, the error that environment degree of preventing causes can be reduced, further temperature impact is compensated.Stable output can be made at 0 ~ 3V by regulator potentiometer R11, the concentration of being convenient to carry out the standard that changes into calculates.
In the present embodiment, the charactron that described display circuit 6 is 3 74LS164 shift register chips and is connected with each shift register chip.74LS164 is unidirectional 8 bit shift register of TTL, can realize serial input, parallel output, can carry out static state display by 8 bit shift register 74LS164.
In the present embodiment, described warning circuit 7 adopts the voice alarm circuit based on ISD1110 speech chip.Its monolithic recording playback time 10s, and there are unique recording control and the two kinds of playbacks controls of edge/level triggers, greatly improve the dirigibility of control.After recording playback operation terminates, ISD1110 enters low-power consumption energy-saving mode automatically, has EEPROM unit information can when without the need to preserving the voice messaging recorded when back-up source in its sheet.
Alarm of the present utility model is mainly installed on the indoor that kitchen, bathroom etc. use combustion gas, and energising (direct current or interchange) is after 3 minutes, and namely this equipment enter duty.When the detecting devices on this alarm detects (on display circuit 6, numerical value is more than 3000) when indoor gas concentration reaches certain numerical value, namely loudspeaker on warning circuit 7 carry out audible alarm, until gas detection sensor 3 detects (on display circuit 6, numerical value is lower than 3000) when indoor gas concentration is reduced to certain numerical value stop audible alarm just now.This alarm also has the key circuit 5 of a hand-reset, if it does not automatically reset after each equipment alarm, can it be made to reset by pressing keys circuit 5 manually.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solutions of the utility model.
Claims (6)
1. a novel gas alarm, it is characterized in that: comprise central processing unit (1), power circuit (2), gas detection sensor (3), signal conditioning circuit (4), key circuit (5), display circuit (6) and warning circuit (7), described power circuit (2) and central processing unit (1), gas detection sensor (3), signal conditioning circuit (4) connects, described gas detection sensor (3) output terminal is connected with signal conditioning circuit (4), described signal conditioning circuit (4) output terminal is connected with central processing unit (1), described central processing unit (1) and key circuit (5), display circuit (6) is connected with warning circuit (7).
2. according to a kind of novel gas alarm according to claim 1, it is characterized in that: described power circuit (2) is the power circuit based on TPS79533 low pressure voltage stabilizer.
3. according to a kind of novel gas alarm according to claim 1, it is characterized in that: described gas detection sensor (3) adopts catalytic combustion method gas sensor TGS6812.
4. according to a kind of novel gas alarm according to claim 1, it is characterized in that: described signal conditioning circuit (4) is based on the adjustable amplifying circuit of the differential gain of LM158.
5. according to a kind of novel gas alarm according to claim 1, it is characterized in that: the charactron that described display circuit (6) is 3 74LS164 shift register chips and is connected with each shift register chip.
6. according to a kind of novel gas alarm according to claim 1, it is characterized in that: described warning circuit (7) adopts the voice alarm circuit based on ISD1110 speech chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520116239.5U CN204515991U (en) | 2015-02-14 | 2015-02-14 | A kind of novel gas alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520116239.5U CN204515991U (en) | 2015-02-14 | 2015-02-14 | A kind of novel gas alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204515991U true CN204515991U (en) | 2015-07-29 |
Family
ID=53713940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520116239.5U Expired - Fee Related CN204515991U (en) | 2015-02-14 | 2015-02-14 | A kind of novel gas alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204515991U (en) |
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2015
- 2015-02-14 CN CN201520116239.5U patent/CN204515991U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 Termination date: 20210214 |
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| CF01 | Termination of patent right due to non-payment of annual fee |