CN2046249U - Domestic automatic gas alarm - Google Patents
Domestic automatic gas alarm Download PDFInfo
- Publication number
- CN2046249U CN2046249U CN 88203135 CN88203135U CN2046249U CN 2046249 U CN2046249 U CN 2046249U CN 88203135 CN88203135 CN 88203135 CN 88203135 U CN88203135 U CN 88203135U CN 2046249 U CN2046249 U CN 2046249U
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- China
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- circuit
- pin
- resistance
- point
- voltage comparator
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model relates to a household fuel gas automatic audible and visual alarm, which is suitable for the household to prevent the gas poisoning and keep freshness of the indoor air in favor to the physical and mental health, and being a music doorbell at the same time. The controlling system is mainly composed of a gas sensitive conversion probe head circuit, a voltage amplification comparison circuit, an electric relay executive circuit, a music doorbell circuit and a regulated power supply.
Description
The invention belongs to a kind of family expenses warning device.
The large, medium and small city of China and some rural area, coal or oil liquefied gas are requisite fuel in the family life.These fuel are in combustion process, often because of burning insufficient or other is former thereby discharge many harmful gas contaminated airs, infringement people's health, even threat to life.
At present, the vent fan of selling on the market can play some and improve the contaminated effect of room air, is by rule of thumb but open or close vent fan, has certain blindness, sometimes Wu Wei consumed power.
Purpose of the present invention is to provide a kind of household fuel gas acousto-optic autoalarm.Its suitable family uses, guards against gas poisoning, keeps room air fresh, in order to health, but and double as music door-bell.It can be monitored automatically to coal gas, oil liquefied gas harmful gases such as (being carbon monoxide, methane, butane) in the room air, when the content concn of these gases reaches 1000ppm, during also far below dangerous concentrations, at once sound and light alarm, and open vent fan automatically, treat to close automatically behind the indoor air purification.If desired, it can also close the solenoid valve of gas range air supply pipe automatically, or is used for the leak detection of gas piping.
The invention is characterized in: its control system is changed several parts such as probe circuit, voltage amplification comparator circuit, relay executive circuit, music doorbell circuit, stabilized voltage supply and is formed by air-sensitive.Its principle as shown in Figure 1.
Among the figure, marked change makes P with the concentration of the harmful gas in the surrounding environment in the internal resistance of gas sensitive tube A
1The current potential of point changes, and when the concentration of harmful gases such as airborne carbon monoxide rose, the internal resistance of gas sensitive tube diminished, and makes P
1The current potential of point rises.Be higher than P when rising to
2The point current potential the time, integrated circuit voltage amplification comparer BG307 reverses immediately, output noble potential, make triode B
2Conducting, the relay adhesive, music doorbell circuit CW8403 begins automatic warning, and vent fan is also connected because of circuit and is opened, and harmful gas concentration reduces in air, and resistive is big in the gas sensitive tube, makes P
1The current potential of point returns to and is lower than P originally
2Till the point.P
2The current potential of point is by R
3Regulate given, as threshold value, with P
1The current potential of point compares at any time.Under normal circumstances, P
2The current potential of point is higher than P
1The current potential of point.Voltage amplification comparer B
1So the output electronegative potential is B
2End, relay keeps off-state.Regulate R
3, given P
2The potential value that point is different, the sensitivity that can control alarm changes within a large range.
The designed coal gas autoalarm of the utility model is highly sensitive, dependable performance, power consumptive province (less than 1.5W), production cost is low, easy for installation, multi-usage, widely applicable, real for preventing gas poisoning, keep room air fresh, the necessary article of Modern Family.
Claims (1)
1, a kind of household fuel gas autoalarm, of the present utility model being characterised in that: its control system is changed several main parts such as probe circuit, voltage amplification comparator circuit, relay executive circuit, music doorbell circuit, stabilized voltage supply and is constituted by air-sensitive, the annexation in the circuit between each element is: the internal resistance of gas sensitive tube A and resistance R
1, R
2, potentiometer R
3And resistance R
4Connect and compose the alternating current bridge circuit, P
1Point and P
2Point is two output terminals of electric bridge, potentiometer R
3Moving point be connected resistance R with the 1 pin inverting input of voltage comparator B G307
1Hot end be connected with the 2 pin in-phase input ends of voltage comparator B G307, voltage comparator output terminal 9 pin are by current-limiting resistance R
5With transistor B
2Base stage be connected; Voltage comparator B
19 pin output noble potential, relay adhesive exhaust fan is connected, music door-bell is reported to the police; 9 pin output electronegative potential, transistor B
2Be in cut-off state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88203135 CN2046249U (en) | 1988-02-05 | 1988-02-05 | Domestic automatic gas alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88203135 CN2046249U (en) | 1988-02-05 | 1988-02-05 | Domestic automatic gas alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2046249U true CN2046249U (en) | 1989-10-18 |
Family
ID=4838016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88203135 Withdrawn CN2046249U (en) | 1988-02-05 | 1988-02-05 | Domestic automatic gas alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2046249U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101727173A (en) * | 2008-10-29 | 2010-06-09 | 鸿富锦精密工业（深圳）有限公司 | Economizer |
-
1988
- 1988-02-05 CN CN 88203135 patent/CN2046249U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101727173A (en) * | 2008-10-29 | 2010-06-09 | 鸿富锦精密工业（深圳）有限公司 | Economizer |
| CN101727173B (en) * | 2008-10-29 | 2013-11-06 | 鸿富锦精密工业（深圳）有限公司 | Economizer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |