CN2158555Y - Fire alarm - Google Patents
Fire alarm Download PDFInfo
- Publication number
- CN2158555Y CN2158555Y CN 93211827 CN93211827U CN2158555Y CN 2158555 Y CN2158555 Y CN 2158555Y CN 93211827 CN93211827 CN 93211827 CN 93211827 U CN93211827 U CN 93211827U CN 2158555 Y CN2158555 Y CN 2158555Y
- Authority
- CN
- China
- Prior art keywords
- thermistor
- circuit
- control circuit
- fire alarm
- warning
- Prior art date
- 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
Links
- 230000002265 prevention Effects 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 208000019595 distal arthrogryposis type 1A Diseases 0.000 description 1
- 208000037748 distal type 1A arthrogryposis Diseases 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Fire-Detection Mechanisms (AREA)
- Fire Alarms (AREA)
Abstract
The utility model belongs to a fire prevention alarm device, its circuit includes power supply circuit, control circuit and warning circuit, meets the reduction of hot back resistance according to thermistor, makes control circuit switch on work, reports to the police then. The utility model discloses low price, warning sensitivity remove the photosensitive element and install in the fire prevention region, and all the other components are all installed in a shell, and thermistor links to each other by wire and alarm, and the alarm can set up in frequent someone's places such as the room of on duty. The utility model discloses can reduce the loss that the conflagration brought effectively.
Description
The utility model belongs to a kind of fireproof alarming device.
The fire that is caused by various accidents happens occasionally, and brings tremendous loss for people's life and national wealth.Particularly current science and technology is relatively more flourishing, and various ornament materials are applied to the finishing in shop, hotel, family room, and these ornament materials mostly to be chemical material make, be easy to conflagration in case meet fire.And have a lot of departments awareness of the importance of fire prevention thin, some places even do not have fire-fighting equipment.At present the most frequently used fire prevention way is to be provided with spray, high pressure water plug etc. in needs fireproof place, and these ways are also just found just to work after fire has taken place, as finds laterly just may cause heavy losses.
The purpose of this utility model is a kind of fireproof alarming device of design, this device can be at the initial stage that fire takes place, do not wait on fire will the warning of burning, this warning device all can be installed in the place that reception room, duty room etc. often have the people except that temperature-sensing element, therefore can in time take measures, reduce the loss.
Circuit theory diagrams of the present utility model are as shown in drawings: mainly comprise power circuit (1), control circuit (2), warning circuit (3).Describe formation of the present utility model and principle in detail below in conjunction with accompanying drawing:
One, power circuit: form by transformer B, bridge rectifier filter circuit and 7809 stabipacks, for control circuit provides needed operating voltage.
Two, control circuit: by potentiometer R
1, thermistor R
T, triode BG
1, BG
2, resistance R
2, R
3, stabilivolt D
2And relay J is formed.Triode BG
1Base stage and potentiometer R
1Link to each other, emitter is through stabilivolt D
2Meet triode BG
2Base stage, BG
2The collector connecting relay coil, milliammeter A is serially connected in the control circuit.Adjust potentiometer R
1, R
T(thermistor) makes triode BG
1End, at R
2So last absence of voltage is stabilivolt D
2Not conducting, triode BG
2There is not base current, triode BG
2Not conducting, relay J is not inhaled.When burning things which may cause a fire disaster, Mr.'s smog, along with the rising of flue gas, the temperature of air also raises, as thermistor R
TThe thermistor of (in order to enlarge the fire prevention scope, 15K-18K Ω) can adopt the little resistance thermistor of hundreds of ohm when running into hot-air, with the form of a plurality of series connection, is distributed in each position of area of fire protection), resistance reduces, and is triode BG
1Bias current is provided, makes BG
1Conducting, and in resistance R
2Last generation voltage drop, stabilivolt D
2Puncture conducting, give triode BG
2Base current is provided, makes BG
2Conducting, collector current make the relay J adhesive by relay coil, and a normally opened contact of relay J is to be serially connected on the power supply of warning circuit, so its normally opened contact closure is connected alarm, makes the alarm sounding alarm.
In order to improve the sensitivity of alarm, adjust potentiometer R
1With thermistor R
T, make triode BG
1Certain electric current is arranged, this current flowing R
2In time, produces certain voltage and falls, and makes stabilivolt D
2Puncture conducting, electric current is little, although triode BG
2Conducting, but collector current does not reach the pull-up current of relay when the relay coil, so relay do not work, warning circuit is not also worked.When burning things which may cause a fire disaster, indoor temperature has rising slightly, and the resistance of thermistor will diminish, and gives triode BG
1Bigger bias current is provided, makes by triode BG
1Electric current increase corresponding R
2On voltage drop increase, by stabilivolt D
2Electric current sharply increase, again through triode BG
2Amplify, so triode BG
2Collector current bigger, the power supply of alarm, alarm equipment alarm are connected in the very fast adhesive of relay J.
Three, warning circuit: be made up of pronunciation integrated package, power supply and loudspeaker, a normally opened contact of relay J is concatenated on the power supply of warning circuit, and the integrated package that pronounces as used herein is 7561 pronunciation integrated packages, and its sound is like the chimes of doom of fire truck.
The utility model is a box structure, and thermistor socket, potentiometer switch and milliammeter all are located on the housing, and each thermistor connects, and is placed on the higher position of room, storehouse etc., connects plug with two leads and is plugged on the socket.Except that temperature-sensing element was temperature-sensitive resistance, alarm can be installed in the place that duty room etc. often has the people.
Using method of the present utility model is: this equipment is connect the 220V power supply, turn on the power switch, adjust potentiometer, make reometer indication certain numerical value (according to circumstances adjusting), this moment, alarm entered the state of alert, in case the condition of a fire is arranged, do not waited flare to catch fire, as long as temperature has rising slightly, the resistance of thermistor will descend, and this moment, alarm will pronounce to report to the police.
Major parameter of the present utility model:
C
1＝1000μF C
2＝0.1μF
R
T＝15－18KΩ R
2＝600Ω
R
3=100 Ω; D is the 2CP10 diode, D
2Be 2.7 volts of stabilivolts,
BG
1Be 3DG4 triode, DG
2Be the DA1A triode
The pronunciation integrated package adopts 9561 integrated packages, and operating voltage is 3V.
Advantage of the present utility model is: cost is low, and it is sensitive, easy to use to report to the police, reliable, in case there is fire in time to find, can reduce the loss that fire brings effectively.
Description of drawings:
Accompanying drawing is circuit theory diagrams of the present utility model
1, power circuit, 2, control circuit, 3, warning circuit
Claims (6)
1, a kind of fire alarm is characterized in that: its circuit comprises power circuit (1), control circuit (2), warning circuit (3).
2, fire alarm according to claim 1 is characterized in that: control circuit (1) is made up of transformer B, bridge rectifier filter circuit and stabipack.
3, fire alarm according to claim 1 is characterized in that: control circuit (2) is by potentiometer R
1, thermistor R
T, triode BG
1, BG
2, resistance R
2, R
3, stabilivolt D
2And relay J is formed triode BG
1Base stage and potentiometer R
1Link to each other, emitter is through stabilivolt D
2Meet BG
2Base stage, BG
2The coil of collector connecting relay J, milliammeter A is serially connected in the control circuit.
4, fire alarm according to claim 1 is characterized in that: warning circuit (3) is made up of pronunciation integrated package, power supply and loudspeaker Y, and a normally opened contact of relay J is concatenated on the power supply of pronunciation integrated package.
5, fire alarm according to claim 3 is characterized in that: thermistor R
TCan be composed in series by the thermistor of a plurality of little resistances, be provided with the thermistor socket on the alarm housing, thermistor can be plugged on the socket.
6, fireproof alarming according to claim 1 is characterized in that: the warning external form is a boxlike, and milliammeter A and potentiometer switch all are located on the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93211827 CN2158555Y (en) | 1993-04-26 | 1993-04-26 | Fire alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93211827 CN2158555Y (en) | 1993-04-26 | 1993-04-26 | Fire alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2158555Y true CN2158555Y (en) | 1994-03-09 |
Family
ID=33793321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93211827 Expired - Fee Related CN2158555Y (en) | 1993-04-26 | 1993-04-26 | Fire alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2158555Y (en) |
-
1993
- 1993-04-26 CN CN 93211827 patent/CN2158555Y/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 | ||
| 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 |