CN2246295Y - Semiconductor fire detector - Google Patents
Semiconductor fire detector Download PDFInfo
- Publication number
- CN2246295Y CN2246295Y CN 95219649 CN95219649U CN2246295Y CN 2246295 Y CN2246295 Y CN 2246295Y CN 95219649 CN95219649 CN 95219649 CN 95219649 U CN95219649 U CN 95219649U CN 2246295 Y CN2246295 Y CN 2246295Y
- Authority
- CN
- China
- Prior art keywords
- signal
- semiconductor
- converter
- fire detector
- gas sensor
- 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
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- Fire-Detection Mechanisms (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The utility model relates to a semiconductor fire detector. An air permeable face mask covers a semiconductor gas sensor, and a signal processor is arranged in a bottom casing. The signal processor is composed of a load resistor, a signal regulator, an A/D converter and a singlechip. The semiconductor gas sensor is connected with the load resistor, the signal regulator, the A/D converter and the singlechip, and the output terminal of the semiconductor gas sensor is connected with an alarm device.
Description
The utility model relates to a kind of detector of fire alarm, particularly a kind of semiconductor fire detector.It determines whether to report to the police by the concentration of detection inflammable gas, organic liquor steam, smog etc. or the increase of concentration.
Commercial fire detector is divided into three major types basically, and promptly flame sensing, heat and flue gas are surveyed.At present, the smoke detector of fire detector with the most use in the daily life, and ion smoke detector dominates, combustible gas probe are then except traditional particular application, and be extensive day by day in domestic. applications.One of defective of ion smoke detector is a contaminated environment, and it has used radioactive material (as A
241) as α particle source; Its less stable of home-use combustible gas probe, in addition, such detector is to report to the police according to the concentration of flue gas, lower undoubtedly alarm threshold means frequent false alarm and bothers the user, and higher alarm threshold causes alarm velocity quite slow.
The purpose of this utility model is to provide a kind of semiconductor fire detector, and its sensing range is wide, response speed is fast, low price, reliability height.
Technical solution of the present utility model is: the semiconductor fire detector comprises drain pan, breathable gas mask, it is characterized in that breathable gas mask semiconductor gas sensor, signal processing apparatus is arranged in the drain pan, signal processing apparatus is made up of pull-up resistor, signal condition, A/D converter, single-chip microcomputer, semiconductor gas sensor connects pull-up resistor, signal condition, signal condition connects A/D converter, and A/D converter connects single-chip microcomputer, the output of single-chip microcomputer device taking alarm.
Signal condition is a signal follower.
Warning device is made up of light emitting diode and current-limiting resistance
After the utility model energy electricity, through time-delay, semiconductor gas sensor converts the concentration of inflammable gas, organic liquor steam, smog etc. to the voltage at pull-up resistor two ends, this electric signal converts the defeated people's signal of standard of A/D converter to through signal condition, convert digital signal to by A/D converter, digital signal is handled by single-chip microcomputer then, to determine whether to send alerting signal.Then deliver to the warning device warning if send alerting signal.
Single-chip microcomputer to the principle of work of signal Processing is:
(1) gather a concentration signal every the Δ t time, when adopting progressively the comparison expression A/D converter, this concentration signal is that the filtering by n sampled value obtains.
(2) in a up-to-date N concentration signal, establish the 1st (1=1,2 ..., N) individual concentration signal is V
1, if V
N〉=Vmax or V
N〉=KV
1And V
N〉=V
1+ Δ V
1(Δ V＞0, K＞1) to some 1 establishments, then sends alerting signal.(wherein Vmax is the concentration alarm threshold of setting, the alarm threshold that K and Δ V increase for the concentration that is provided with).
Advantage of the present utility model is: (1), owing to adopt low-cost semiconductor gas sensor makes the utility model cost low.When a plurality of the utility model are used in combination, for example, aiming at certainly in the flame snuffer especially, adopting a plurality of smoke detectors to detect condition of a fire generation area, having tangible price advantage.(2), determine whether to report to the police by the concentration of detection inflammable gas, organic liquor steam, smog etc. or the increase of concentration, thereby eliminate the influence that concentration, voltage, component aging, smoking etc. slowly change, reliability height, response speed are fast, and sensing range is wide.(3), both can be used for family, also can be used for places such as hotel, reference room, warehouse, movie theatre.
Fig. 1 is a diagrammatic cross-section of the present utility model.
Fig. 2 is a circuit theory sketch of the present utility model.
The utility model will be further described below in conjunction with embodiment.
Referring to Fig. 1, Fig. 2, the plastic face mask (1) that has bleeder vent (12) is covering semiconductor gas sensor (2), and its model is QM-N
5, signal processing apparatus (4) is housed in drain pan (3), signal processing apparatus (4) is made up of pull-up resistor (5), signal follower (6), A/D converter (7), single-chip microcomputer (8), and wherein the model of signal follower (6) is LM
324The model of A/D converter (7) is ADC0809, the model of single-chip microcomputer (8) is 875, semiconductor gas sensor (2) connects pull-up resistor (5), signal follower (6), signal follower (6) connects A/D converter (7), and A/D converter (7) connects single-chip microcomputer (8), the output sending and receiving optical diode (10) of single-chip microcomputer (8) and current-limiting resistance (11).
Claims (3)
1, a kind of semiconductor fire detector, comprise drain pan, breathable gas mask, it is characterized in that breathable gas mask (1) is covering semiconductor gas sensor (2), signal processing apparatus (4) is arranged in the drain pan (3), signal processing apparatus (4) is made up of pull-up resistor (5), signal condition (6), A/D converter (7), single-chip microcomputer (8), semiconductor gas sensor (2) connects pull-up resistor (5), signal condition (6), signal condition (6) connects A/D converter (7), A/D converter (7) connects single-chip microcomputer (8), the output device taking alarm (9) of single-chip microcomputer (8).
2, a kind of semiconductor fire detector according to claim 1 is characterized in that signal condition (6) is signal follower.
3, a kind of semiconductor fire detector according to claim 1 is characterized in that warning device (9) is made up of light emitting diode (10) and current-limiting resistance (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95219649 CN2246295Y (en) | 1995-08-17 | 1995-08-17 | Semiconductor fire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95219649 CN2246295Y (en) | 1995-08-17 | 1995-08-17 | Semiconductor fire detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2246295Y true CN2246295Y (en) | 1997-01-29 |
Family
ID=33867792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95219649 Expired - Fee Related CN2246295Y (en) | 1995-08-17 | 1995-08-17 | Semiconductor fire detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2246295Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294923B (en) * | 2008-05-29 | 2011-03-02 | 中国科学技术大学 | Capacitor type smoke detector |
-
1995
- 1995-08-17 CN CN 95219649 patent/CN2246295Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294923B (en) * | 2008-05-29 | 2011-03-02 | 中国科学技术大学 | Capacitor type smoke detector |
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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 |