CN2722244Y - Air absorbing style smoke and gas mixed fire detector - Google Patents
Air absorbing style smoke and gas mixed fire detector Download PDFInfo
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- CN2722244Y CN2722244Y CN 200420079019 CN200420079019U CN2722244Y CN 2722244 Y CN2722244 Y CN 2722244Y CN 200420079019 CN200420079019 CN 200420079019 CN 200420079019 U CN200420079019 U CN 200420079019U CN 2722244 Y CN2722244 Y CN 2722244Y
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Abstract
The utility model relates to an air absorbing style smoke and gas mixed fire detector, belonging to the technical field of the fire fighting device; the detector comprises a light chamber and a fire destination gas sensor that are arranged in a housing, a light emission and reception element that is arranged in the light chamber, a circuitboard that is connected with the light emission and reception element and the destination gas sensor, and a light sealed detecting chamber that is formed by the housing; the light emission and reception element adopts an LED light emitting device and a light sensation receiving element that are used in ordinary smoke detector; the detecting chamber is provided with a baffle; the smoke and the destination gas are mixed and detected; the false alarm because of the dust and the aqueous vapor is effectively eliminated.
Description
Technical field
The utility model relates to a kind of combined fire detector, and especially a kind of air suction type smog and gas recombination fire detector belong to the fire fighting device technical field.
Background technology
Usually, the common smoke detector that uses in industry, commerce and the family utilizes the convection action of smog to accept smog passively.And the air suction type smoke detector with getter device can initiatively be drawn the air in protected space, has higher sensitivity, therefore needs the occasion (for example computing center, message center, communication relay station etc.) of special protection to be widely used at some.
But the shortcoming that causes false alarm below existing air suction type fire detector exists usually easily: the one, the lens combination in some air suction type fire detector is higher in humidity, during the temperature acute variation, the easy dewfall of eyeglass, thereby change the characteristic of optical system, cause reporting by mistake fire alarm; The 2nd, distinguish the limited in one's ability of fire hazard aerosol fog, koniology and water vapor, when containing dust and water vapor in the air, also might report fire alarm by mistake.In addition, existing air suction type smoke detector adopts laser instrument to do light source, costs an arm and a leg, and the user often hangs back.
Summary of the invention
The technical problems to be solved in the utility model is: at the shortcoming that above prior art exists, propose a kind of highly sensitive, air suction type smog and the gas recombination fire detector that can avoid false alarm and cost economy.
Said herein gas is meant at fire and forms the initial stage by the gas that comburant discharges, is called fire target gas.For example carbonaceous material discharges CO, CO2, CH4 before smog forms and in forming, and sulphur-containing substance discharges SO2, and itrogenous organic substance discharges NO or the like.At different object of protections, can use different target gas sensing devices, carry out detection separately or with smog is compound.Owing to do not contain object gas in dust and the water vapor, therefore detector of the present utility model can be got rid of effectively because the wrong report that dust and water vapor cause on principle.
In order to solve above technical matters, air suction type smog of the present utility model and gas recombination fire detector contain arrangement light chamber and target gas sensing device in the enclosure, the light that is installed in the light chamber transmits and receives element, transmit and receive the circuit board that element and target gas sensing device are connected with light, it is characterized in that: described shell constitutes the detecting chamber of optics sealing, and it is LED light-emitting component and the light activated element that uses in the common smoke detector that described light transmits and receives element.
The utility model further improves: the upper fixed in detecting chamber smog sensitizing range has the dividing plate of being in the light.This dividing plate and shell acting in conjunction add the optics leakproofness of detecting chamber, and background signal that the radiated element of decaying effectively causes on the receiving element sensitive direction and the background signal that is caused by ring mirror light have guaranteed high detection sensitivity.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is a system chart of the present utility model.
Fig. 2 is the structural representation of an embodiment of the utility model.
Fig. 3 is the left view of Fig. 2.
Fig. 4 is the vertical view of Fig. 2.
Fig. 5 is the physical dimension graph of a relation of Fig. 2 embodiment.
Fig. 6 is the main devices circuit theory diagrams of circuit board among Fig. 2 embodiment.
Embodiment
Embodiment one
The system that the utility model air suction type smog and gas recombination fire detector are formed as shown in Figure 1.Its chief component and function are as follows:
1, air sampling pipeline---one through to protected position in smog and the gas detecting chamber, has several air sampling holes at protected position.During work, the swabbing action of blower fan produces negative pressure in pipeline, and the air at protected position is by in the thieff hatch upstream line, and enters detecting chamber by pipeline.
2, air strainer---in order to reduce the pollution of koniology to smoke detection, detection of gas and air-flow monitoring part sensitive element, filtration is absolutely necessary.Air strainer 6 is positioned at detecting chamber shell 10, near air intake opening 7 (referring to Fig. 2,3 and 4).For guaranteeing strainability and air by performance, filter element will regularly replace.
The object gas of 3, smog and gas detecting chamber---Fig. 2,3,4 illustrated embodiments is a carbon monoxide.By Fig. 2,3 and 4 as can be seen, and the complex probe chamber has one to make optics sealing shell 10 by black plastic, and extraneous light can not enter in the shell.Air intake opening 7 links to each other with pipeline with gas outlet 9, and is also light tight.Therefore, this detecting chamber is that optics is airtight, wherein is mounted with light chamber 1.The LED infrared emission component 2 and the infrared receiver component 4 that use in the common smoke fire detector are installed on the light chamber 1.This two elements 2,4 and all be installed on the circuit board 3 as the CO sensor 8 of target gas sensing device.Relevant function element such as amplifier and microprocessor etc. also are installed on circuit board 3 simultaneously.
3.1 the relay stations of smoke detection---some special protection occasion such as computer house, message center, communication etc. require very high for will reach early warning to smoke detection sensitivity.The smoke detection sensitivity of Fig. 2 embodiment can reach 0.005dB/m or higher, is about 100 times of general conventional smoke detector.Similar on its smoke detection mechanism principle to conventional smoke detector, employing be diffuse transmission type photoelectric smoke detection method and common infrared electro device.And the general laser diode that uses reaches high detection sensitivity in the existing air-breathing smoke detector, so price is high.The application makes conventional diffuse transmission type photo-detection method reach the high sensitivity of laser detection system by following approach.
3.1.1 the detecting chamber that optics is airtight---conventional optical detector of fire smoke utilizes the cross-ventilation effect that smog is diffused in the detector, for guaranteeing entering of smog, detecting chamber is made maze-type structure, is guaranteeing to prevent directly injecting of ambient light when smog enters.But surround lighting still can enter detecting chamber indirectly by the reflex of labyrinth cover blade.Because the detection sensitivity of conventional smoke detector is lower, is generally 0.2-0.7dB/m, the formed background signal of ambient light that enters detecting chamber by maze-type structure only accounts for the very small scale of the total dynamic range of signal.If but sensitivity improves, for example after 100 times, will be strengthened greatly by the formed background signal of the surround lighting that enters detecting chamber, even whole dynamic range that can seizing signal, detector can't be worked at all.Therefore the smoke detection of present embodiment has partly been adopted and has been made surround lighting can not enter closed structure fully.Shell 10 is the black plastic housings that optics is airtight among Fig. 2.
3.1.2 dividing plate is set in the detecting chamber---the infrared beam AOB that infrared emission component 2 sends among Fig. 2 can or repeatedly reflect (shown in CD) particularly forms certain intensity on the optical axial direction EOF of receiving element 4 in detecting chamber " brightness " by the inwall reflection (shown in BC) of shell 10, therefore under the situation of the pure air that does not have smog, infrared receiver component 4 still can " be seen " certain light, and this also is an important source of background signal.Before address, this background signal can occupy even exceed total dynamic range of signals under the sensitivity that exceeds 100 times of conventional smoke detectors, detector can't be worked.For reducing the reflection of shell 10 inwalls or repeatedly reflecting contribution to background signal, the application is provided with black dividing plate 5 above the O of smog sensitizing range.The inside dimension acting in conjunction of this dividing plate 5 and suitable shell 10 background signal that radiated element 2 causes on receiving element 4 sensitive direction EOF of having decayed effectively.
Above-mentioned " suitable shell sizes " can obtain (referring to Fig. 5) by formula (1):
Z＝(2-4)Xtgθ (1)
Z in the formula: the vertical range of light chamber surface to the shell;
X: center, light chamber is to the horizontal range (to radiated element opposite inwall) of shell;
θ: the angle of radiated element optical axial S and surface level
By above two measures, background signal can be limited in total dynamic range 20% in, thereby guaranteed high detection sensitivity.
3.2 CO gas is surveyed---CO gas sensor 8 is positioned at detecting chamber optical detection immunity region (seeing Fig. 2,3 and 4), therefore can not influence smoke detection itself.Because the appearance of CO gas generally early than smog, therefore comes detection of fires to guarantee high detection sensitivity from principle with this object gas.
Also can realize after the signal of carbon monoxide and smoke signal are compound reporting to the police.
In the above two kinds of cases, owing to do not contain carbon monoxide in the dust and in the water vapor, so the extraction of carbon monoxide signal just can be eliminated the wrong report fire alarm that is caused by dust and water vapor.
4, air-flow monitoring---the purpose of air-flow monitoring is to confirm the normal operating conditions of extract system.Fan trouble, pipeline obstruction etc. cause gas velocity low in case for example bleed for a certain reason, promptly give a warning, and can work effectively to guarantee total system.The air-flow monitoring element is positioned at the pipeline of the gas outlet 9 or air intake opening 7 outsides of detecting chamber.The said flow monitoring element can be the flow rate detection element of any principle.
The effect of 5, the blower fan of bleeding---the blower fan of bleeding is the rotation by self blade, causes negative pressure, forces the air in protected space to flow into sampling pipe, enters detecting chamber.
6, signal Processing and warning indication---this part is carried out analog to digital conversion and signal Processing after smoke signal and object gas signal are amplified, size and fire alarm with two paths of signals shows again, simultaneously the air-flow monitor signal is handled, when fault occurs, sent diagnostic message.
As shown in Figure 6, as CO sensitive element (model FICAR02442) N3 of target gas sensing device, its signal output part forms output signal voltage and delivers to the P2 mouth of microprocessor μ P1 (PIC16F877A) on resistance R 8.The triode V3 and the resistance R 6 that are controlled by microprocessor uP1 provide constant working current to infrared-emitting diode V2 (TSUS5201).The infrared light of infrared-emitting diode V2 emission is after being detected indoor smoke particle scattering, receive by infrared photodiode V1 (BPV10F) as the smoke detection device, form photocurrent, this photocurrent produces photovoltage on resistance R 5, be sent to the P4 mouth of microprocessor μ P1 after amplifier N2 (model C A3130) amplifies.Microprocessor uP1 carries out analog to digital conversion and data processing to the smoke signal of P4 mouth and the carbon monoxide signal of P2 mouth, provides result of determination according to certain criterion and logical relation.Owing to realize the microprocessor that complex probe is controlled on the equal connection circuit plate of output terminal of the signal output part of target gas sensing device and smoke detection signal, so the user can pass through setting program, selects following working method:
A) smog is reported to the police separately---when at the appointed time reaching predetermined value in the section, sends the increment of smoke signal fire alarm;
B) object gas is reported to the police separately---and when the increment of object gas signal at the appointed time reaches predetermined value in the section, send fire alarm, or when the absolute value of object gas signal reaches predetermined value, send object gas poisoning alarm;
C) combinde alarms---at the appointed time send compound fire alarm when reaching predetermined value in the section when smoke signal and object gas signal with the result.
Among Fig. 6, R7 is the thermistor that is used for flow monitoring, provides constant working current by three terminal regulator N1 and resistance R 1.Flow monitoring voltage on the R7 is sent to the P1 mouth of microprocessor uP1.Air velocity is low when pipeline (Fig. 2) lining, and the heat that flow monitoring resistance R 7 is pulled away reduces, and the temperature of R7 raises, and resistance descends, and the flow monitoring voltage of output reduces, and microprocessor uP1 judges that in view of the above the air velocity in the pipeline is undesired.
7, communication interface---this part can be with the full detail of system, sends other detector or upper system for example pulpit, disaster relief centers etc. to by the content of agreement and form.
Experiment showed, that the air suction type smog of present embodiment and gas recombination fire detector have can avoid false alarm, highly sensitive, the outstanding advantage of cost economic dispatch.
Claims (4)
1. air suction type smog and gas recombination fire detector, contain arrangement light chamber and target gas sensing device in the enclosure, the light that is installed in the light chamber transmits and receives element, contain functional circuit and microprocessor circuit plate with light transmits and receives that element and target gas sensing device be connected, it is characterized in that:
Described shell constitutes the detecting chamber of optics sealing;
It is LED light-emitting component and the light activated element that common smoke detector uses that described light transmits and receives element.
2. according to described air suction type smog of claim 1 and gas recombination fire detector, it is characterized in that: the airtight detecting chamber of the described optics sensitizing range upper fixed dividing plate that is in the light.
3. according to described air suction type smog of claim 1 and gas recombination fire detector, it is characterized in that: the microprocessor of realizing complex probe control on the equal connection circuit plate of the signal output part of described target gas sensing device and the output terminal of smoke detection signal.
4. according to described air suction type smog of claim 2 and gas recombination fire detector, it is characterized in that: described dividing plate and shell inside dimension satisfy following relational expression:
Z＝(2-4)X?tgθ
Z in the formula: the vertical range of light chamber surface to the shell;
X: center, light chamber is to the horizontal range of shell;
θ: the angle of radiated element optical axial and surface level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420079019 CN2722244Y (en) | 2004-08-27 | 2004-08-27 | Air absorbing style smoke and gas mixed fire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420079019 CN2722244Y (en) | 2004-08-27 | 2004-08-27 | Air absorbing style smoke and gas mixed fire detector |
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| CN2722244Y true CN2722244Y (en) | 2005-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200420079019 Expired - Fee Related CN2722244Y (en) | 2004-08-27 | 2004-08-27 | Air absorbing style smoke and gas mixed fire detector |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101140293B (en) * | 2006-09-05 | 2011-12-07 | 能美防灾株式会社 | Fire detector |
| CN102564959A (en) * | 2012-01-09 | 2012-07-11 | 武汉理工大学 | Device for detecting combustion flue gas amount of combustible material |
| CN103366495A (en) * | 2013-07-11 | 2013-10-23 | 合肥工业大学 | Air-breathing high-sensitivity smoke particle detector and application thereof |
| CN106887107A (en) * | 2017-04-18 | 2017-06-23 | 国网安徽省电力公司电力科学研究院 | A kind of gas recombination detector for cable fire |
| CN109959591A (en) * | 2017-12-22 | 2019-07-02 | 日立-Lg数据存储韩国公司 | Combine the sensor of dust sensor and gas sensor |
| US11506586B2 (en) | 2020-08-17 | 2022-11-22 | Carrier Corporation | Photoelectric smoke sensor tube |
-
2004
- 2004-08-27 CN CN 200420079019 patent/CN2722244Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101140293B (en) * | 2006-09-05 | 2011-12-07 | 能美防灾株式会社 | Fire detector |
| CN102564959A (en) * | 2012-01-09 | 2012-07-11 | 武汉理工大学 | Device for detecting combustion flue gas amount of combustible material |
| CN102564959B (en) * | 2012-01-09 | 2014-08-13 | 武汉理工大学 | Device for detecting combustion flue gas amount of combustible material |
| CN103366495A (en) * | 2013-07-11 | 2013-10-23 | 合肥工业大学 | Air-breathing high-sensitivity smoke particle detector and application thereof |
| CN106887107A (en) * | 2017-04-18 | 2017-06-23 | 国网安徽省电力公司电力科学研究院 | A kind of gas recombination detector for cable fire |
| CN109959591A (en) * | 2017-12-22 | 2019-07-02 | 日立-Lg数据存储韩国公司 | Combine the sensor of dust sensor and gas sensor |
| US11506586B2 (en) | 2020-08-17 | 2022-11-22 | Carrier Corporation | Photoelectric smoke sensor tube |
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| 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 |