CN201340645Y - Household harmful gas detection and alarm device - Google Patents
Household harmful gas detection and alarm device Download PDFInfo
- Publication number
- CN201340645Y CN201340645Y CNU2009200833819U CN200920083381U CN201340645Y CN 201340645 Y CN201340645 Y CN 201340645Y CN U2009200833819 U CNU2009200833819 U CN U2009200833819U CN 200920083381 U CN200920083381 U CN 200920083381U CN 201340645 Y CN201340645 Y CN 201340645Y
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- CN
- China
- Prior art keywords
- circuit
- harmful gas
- transistor
- resistor
- alarm device
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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.)
- Expired - Fee Related
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- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The utility model relates to a household harmful gas detection and alarm device, which comprises a detection circuit, a regulation circuit, a control circuit and a drive phonetic circuit. Wherein, the detection circuit comprises a gas sensitive sensor Q1 and a resistor R1; the output ends of the gas sensitive sensor and the resistor are sequentially connected with the regulation circuit, the control circuit and the drive phonetic circuit into a whole. When no harmful gas exists in air, resistance between A and B is great and the current flows through a variable resistor RP is small, B is in low potential and E is also in low potential so that a transistor Q2 and a transistor Q3 are in open circuit state; when harmful gas exists in air, the resistance between A and B decreases rapidly and the current flows through the variable resistor RP increases, the electric potential of B increases and charges the capacitor C2 until the transistor Q2 and the transistor Q3 are saturated to be conducted so that the drive phonetic circuit U1 operates to make a sound. The household harmful gas detection and alarm device has the advantages of simple circuit, effective operation, timely alarm and safe effect.
Description
Technical field
The utility model relates to a kind of detection alarm device, and particularly a kind of family expenses harmful gas is surveyed alarm device.
Background technology
Nowadays, along with improving constantly of continuous progress in science and technology and people's living standard, the family expenses daily living article is also updated, thing followed liquefied gas, rock gas, carbon monoxide, methane, propane etc. all are inflammable gass, all contain objectionable constituent in these gases, when they reach finite concentration in air, will jeopardize people's health and safety, this is a problem anxious to be solved.
The utility model content
The purpose of this utility model is exactly in order to ensure personal safety, prevents trouble before it happens and provide that a kind of circuit is simple, the effective family expenses harmful gas of work is surveyed alarm device.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of family expenses harmful gas is surveyed alarm device, comprising: detection circuit, adjustment circuit, control circuit and driving phonation circuit is characterized in that:
Described detection circuit comprises: gas sensor Q
1And resistor R
1, its output terminal and the variohm RP, the capacitor C that adjust in the circuit
1And resistor R
2An end intersect at the B point simultaneously; Then through resistor R
2The other end and capacitor C
2Transistor Q in one end and the control circuit
2Base stage intersect at the E point; After the transistor Q in the control circuit
2And Q
3Collector and the U that drives phonation circuit
1Input end intersect at the K point, combining constitutes an integral body.
Principle of work of the present utility model is as follows: when not containing harmful gas in the air, the resistance of A, B point-to-point transmission is very big, and the electric current that flows through variohm RP is very little, and B point is an electronegative potential, and E point current potential is also very low equally, transistor Q
2And Q
3Not conducting; When containing harmful gas in the air, the resistance of A, B point-to-point transmission descends rapidly, and the electric current that flows through variohm RP increases, and B point current potential raises, to capacitor C
2Charging makes transistor Q until reaching
2And Q
3Saturation conduction drives phonation circuit U
1Work is sounded.Have that circuit is simple, work effectively, alarm in time, guarantee characteristics such as safety.
Description of drawings
Fig. 1 is the utility model electrical schematic diagram.
Wherein, 1 is detection circuit, and 2 for adjusting circuit, and 3 is control circuit, and 4 for driving phonation circuit.
Embodiment
See also shown in Figure 1ly, be the utility model specific embodiment, comprising: detection circuit 1, adjust circuit 2, control circuit 3 and drive phonation circuit 4, wherein, described detection circuit 1 comprises: gas sensor Q
1And resistor R
1, its output terminal and the variohm RP, the capacitor C that adjust in the circuit 2
1And resistor R
2An end intersect at the B point simultaneously; Then through resistor R
2The other end and capacitor C
2Transistor Q in one end and the control circuit 3
2Base stage intersect at the E point; After the transistor Q in the control circuit 3
2And Q
3Collector and the U that drives phonation circuit 4
1Input end intersect at the K point, combining constitutes an integral body.
In addition, the utility model is installed each circuit concentratedly in a printed board, places in the box, just can use.
Above embodiment only for explanation concrete imagination of the present utility model, circuit formation, technical characterictic and exploitativeness, meets the utility model application important document, so file an application according to Patent Law fully.
Claims (1)
1, a kind of family expenses harmful gas is surveyed alarm device, comprising: detection circuit (1), adjustment circuit (2), control circuit (3) and driving phonation circuit (4) is characterized in that:
Described detection circuit (1) comprising: gas sensor Q
1And resistor R
1, its output terminal and the variohm RP, the capacitor C that adjust in the circuit (2)
1And resistor R
2An end intersect at the B point simultaneously; Then through resistor R
2The other end and capacitor C
2Transistor Q in one end and the control circuit (3)
2Base stage intersect at the E point; After the transistor Q in the control circuit (3)
2And Q
3Collector and the U that drives phonation circuit (4)
1Input end intersect at the K point, combining constitutes an integral body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200833819U CN201340645Y (en) | 2009-01-13 | 2009-01-13 | Household harmful gas detection and alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200833819U CN201340645Y (en) | 2009-01-13 | 2009-01-13 | Household harmful gas detection and alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201340645Y true CN201340645Y (en) | 2009-11-04 |
Family
ID=41236188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200833819U Expired - Fee Related CN201340645Y (en) | 2009-01-13 | 2009-01-13 | Household harmful gas detection and alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201340645Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103544813A (en) * | 2012-07-12 | 2014-01-29 | 成都科盛石油科技有限公司 | Self-inspection harmful gas leakage alarm suitable for petroleum refinery |
-
2009
- 2009-01-13 CN CNU2009200833819U patent/CN201340645Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103544813A (en) * | 2012-07-12 | 2014-01-29 | 成都科盛石油科技有限公司 | Self-inspection harmful gas leakage alarm suitable for petroleum refinery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091104 Termination date: 20100220 |