CN104408864A - Air-suction-type plane cargo compartment fire disaster detector with dehumidifying and dedusting functions - Google Patents

Air-suction-type plane cargo compartment fire disaster detector with dehumidifying and dedusting functions Download PDF

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Publication number
CN104408864A
CN104408864A CN201410696274.9A CN201410696274A CN104408864A CN 104408864 A CN104408864 A CN 104408864A CN 201410696274 A CN201410696274 A CN 201410696274A CN 104408864 A CN104408864 A CN 104408864A
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CN
China
Prior art keywords
dehumidifying
detection cavity
cavity
filter
filter cartridge
Prior art date
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Pending
Application number
CN201410696274.9A
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Chinese (zh)
Inventor
付阳阳
陆松
管雨
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HEFEI KESIFU SECURITY TECHNOLOGY Co Ltd
Institute of Advanced Technology University of Science and Technology of China
Original Assignee
HEFEI KESIFU SECURITY TECHNOLOGY Co Ltd
Institute of Advanced Technology University of Science and Technology of China
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Application filed by HEFEI KESIFU SECURITY TECHNOLOGY Co Ltd, Institute of Advanced Technology University of Science and Technology of China filed Critical HEFEI KESIFU SECURITY TECHNOLOGY Co Ltd
Priority to CN201410696274.9A priority Critical patent/CN104408864A/en
Publication of CN104408864A publication Critical patent/CN104408864A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002Casings; Housings; Frame constructions
    • B01D46/0005Mounting of filtering elements within casings, housings or frames
    • B01D46/0008Two or more filter elements not fluidly connected positioned in the same housing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26Drying gases or vapours
    • B01D53/266Drying gases or vapours by filtration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00Cleaning by methods involving the use of air flow or gas flow
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00Fire alarms; Alarms responsive to explosion
    • G08B17/10Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light-emitting and receiving device
    • G08B17/107Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light-emitting and receiving device for detecting light-scattering due to smoke

Abstract

The invention relates to an air-suction-type plane cargo compartment fire disaster detector with dehumidifying and dedusting functions and solves the problem that an air-suction-type fire disaster detector cannot overcome influence of humidity and dust when compared with the prior art. The air-suction-type plane cargo compartment fire disaster detector comprises a filtering box and a membrane dehumidifying device, a filtering material is contained in the filtering box, the membrane dehumidifying device comprises a main temperature adjusting module, a membrane dehumidifying component and an auxiliary temperature adjusting module, the main temperature adjusting module is connected with the membrane dehumidifying component through a pipeline, the membrane dehumidifying component is connected with the auxiliary temperature adjusting module through a pipeline, an air incoming pipe is connected into the filtering box which is connected with the main temperature adjusting module, the auxiliary temperature adjusting module is connected with a detecting cavity through a cavity incoming pipe, and a cavity outgoing pipe is arranged on the detecting cavity. Through the dehumidifying and dedusting functions, detection accuracy is improved, and false alarm rate of a plane cargo compartment fire disaster detection system is lowered.

Description

A kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function
 
Technical field
The present invention relates to fire detector technical field, specifically a kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function.
 
Background technology
Along with the fast development of Chinese Aviation Transportation industry, airfreight becomes one of important sources of civil aircraft income increase, meanwhile aircraft hold is because of different, the changes in environmental conditions large (pressure, temperature and humidity) of its type of merchandize and pose pattern and the feature such as electrical equipment is many, there is the fire risk larger compared with other airtight restricted clearances, once breaking out of fire accident brings huge loss by society, therefore the detection of aircraft hold and warning become more and more important.
Current aircraft hold detection difficult point is that rate of false alarm is high.According to FAA statistics, on average only having in every 200 fire alarms is for 1 time kidney-yang police, nothing once kidney-yang police in 66 fire alarms warning between domestic certain airline 1997-2002.Reason is: the smoke detector that 1, at present aircraft hold generally uses cannot distinguish the undesired signals such as the smoke particle that enters detecting chamber and dust, mist, fiber and fine hair.2, the factor such as different of the change of aircraft hold environment pressure, temperature and humidity and type of merchandize and pose pattern affects form and the transport process of smoke particle, and then affects the response characteristic of detector.In aircraft hold, pressure reduces with the rising of height of mushing, and seating plane is about ten thousand metres during height cruising flight, and the pressure in cargo hold is about 0.8 standard atmospheric pressure.The introduction of " China Science & Technology University's journal " magazine (in spring rain. the sensitivity of spot-type smoke detector under Tibet plateau environment. China Science & Technology University's journal [J] .2007,37 (3) .) under the hypobaric hypoxia environment of plateau, smoke particle mean grain size reduces, and can cause the sensitivity decrease of diffuse transmission type photodetector.3, the detector working method that aircraft hold uses is that the cigarettes such as passive open type enter, and not only needs longer wait flue gas to enter the detection time of detecting chamber, and adds the pollution level of radiated element and receiving element, and then more easily report by mistake.In order to reduce the rate of false alarm of the fire detecting system of aircraft hold, air suction type fire disaster detector is an effective approach.
Existing air suction type fire disaster detector is applied under aircraft hold particular surroundings exists following shortcoming:
1, due to aircraft, in flight course middle hold, temperature can acute variation, and for narrow body aircraft hold, do not install humidity control system, aloft minimum temperature, greatly about about 5 DEG C, has installed the temperature of humidity control system greatly between 5 DEG C ~ 26 DEG C.For the main hold of wide-bodied aircraft, the temperature of humidity control system is installed between 5 DEG C ~ 28 DEG C.For its Lower Deck Cargo CompAtment and bulk cargo hold, humidity control system is not installed, minimum temperature is greatly about about 5 DEG C in-flight, the temperature of humidity control system is installed greatly between 5 DEG C ~ 26 DEG C, the change combined action of adding pressure in moisture and cargo hold that the breathing of competent animals of aircraft hold transport and fresh fruit produce causes cargo hold humidity to increase, the change of temperature and humidity makes the eyeglass of some air suction type fire disaster detector very easily condense, thus its original optical characteristics changes, and causes wrong report; And the change of humidity can affect the reflection characteristic of light in detector, cause wrong report.Although application for a patent for invention " a kind of air suction type aircraft hold fire detecting arrangement based on complex probe technology " proposes a kind of tubulose dryer section using molecular sieve desiccant to compress to make as the moisture in filter wet device removing air, but the mode of this use drying agent is limited to the character of drying agent, and wayward dehumidifying degree specifically;
2, the diversity of aircraft dispatch cargo hold determines in it containing a large amount of dusts and fragment, air suction type fire disaster detector enters detection cavity by getter device draw air sample, long operation, the dust contained in air sample and fractionlet can accumulate on the inside surface of detection cavity, change its original optical characteristics, affect the signal that receiving element receives, easily cause wrong report; The dust etc. be simultaneously trapped on optical element can reduce detector sensitivity.The method of current head it off is by one or more strands of clean gas is imported detection cavity, gas in detection cavity above element flowing prevent the accumulation on its surface such as dust, but still fundamentally can not remove the long-term sticky fine dust floating over element surface.
How to develop a kind of there is dehumidifying, the air suction type fire disaster detector of dedusting function become the technical matters being badly in need of solving.
Summary of the invention
The object of the invention is the defect that cannot overcome humidity, dust impact in order to solve air suction type fire disaster detector in prior art, providing a kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function to solve the problems referred to above.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function, comprise detection cavity, control device, sampling pipe and the draft tube be connected with sampling pipe, described sampling pipe has several thieff hatchs, draft tube is provided with blower fan, described control device is connected with detection cavity, also comprise filter cartridge and membrane dehumidifier, filter cartridge is built with filter material, membrane dehumidifier comprises main temperature adjustment module, film dehumidifying component and from temperature adjustment module, main temperature adjustment module is connected with film dehumidifying component by pipeline, film dehumidifying component is connected with from temperature adjustment module by pipeline, described draft tube access filter cartridge, filter cartridge is connected with main temperature adjustment module by pipeline, and pass through to be connected into lumen with detection cavity from temperature adjustment module, detection cavity is provided with out lumen.
Also comprise dust collection by sound wave device, dust collection by sound wave device comprises cavity and amplifier, be horizontally installed with flexible sheet in the middle part of cavity, cavity is separated into low pressure chamber and high pressure chest by flexible sheet, and low pressure chamber has hole, high pressure chest is connected by high-voltage tube with entering between lumen, high-voltage tube is provided with valve A, the entrance of amplifier is fixedly mounted in high pressure chest, and flexible sheet activity is attached on the entrance of amplifier, detection cavity has air intake opening, and the outlet of amplifier is positioned at the air intake opening place of detection cavity.
Filter material in described filter cartridge is made up of single filter material and cascade filtration material, draft tube is connected on the single filter material place of filter cartridge, filter cartridge is positioned at single filter material place and is provided with one-level pipeline, filter cartridge is positioned at cascade filtration material place and is provided with secondary canalization, one-level pipeline is provided with valve B, secondary canalization is provided with valve C, one-level pipeline and secondary canalization converge rear access main temperature adjustment module.
The described lumen that goes out is connected into draft tube, described blower fan is connected with the gas outlet communicated with draft tube.
A kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function, in described detection cavity, semiconductor laser transmitter is installed, taper delustring element is installed in detection cavity and is positioned at the mirror image place of semiconductor laser transmitter, be positioned at taper delustring element two ends in detection cavity and be separately installed with photodiode receiver A and photodiode receiver B, the front end of photodiode receiver A and photodiode receiver B is equipped with diaphragm and condenser all successively, semiconductor laser transmitter is provided with lens, in detection cavity, beam shaping unit is installed, beam shaping unit is near lens side and be positioned at the both sides of the Laser emission line of semiconductor laser transmitter.
Described single filter material is polyfoam, and described cascade filtration material is HEPA.
 
beneficial effect
A kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function of the present invention, compared with prior art by damp proof, dust-proof effect, improves detection accuracy, reduces the rate of false alarm of aircraft hold fire detecting system.By the design of filter cartridge and membrane dehumidifier, dedusting and dehumidifying can be carried out to the gases at high pressure that blower fan produces, eliminate humidity to the impact of air suction type fire disaster detector optical characteristics, in addition, by regulating the opening degree of admission pressure, feed rate and valve D can the dehumidifying degree of controlling diaphragm dehydrating unit.By the design of dust collection by sound wave device, the vibration that strong sound wave can be utilized to produce evokes the particles such as the dust of detection cavity inside surface and element surface, by the purging of the gas of high cleanliness, take away the particles such as the dust of detection cavity inside surface and element surface delay, eliminate the particles such as dust to the impact of air suction type fire disaster detector response performance.Be applied to aircraft hold fire detecting system, can give full play to its anti-electromagnetic capability strong, the advantages such as compact conformation, lightweight, cost of manufacture is lower, efficient energy-saving, the many-sides such as the economic loss brought are reported in minimizing by mistake all will play important impetus.
 
accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Wherein, 1-thieff hatch, 2-sampling pipe, 3-gas flow detector, 4-draft tube, 5-blower fan, 6-filter cartridge, 7-membrane dehumidifier, 8-dust collection by sound wave device, 9-detection cavity, 10-control device, 11-enters lumen, 12-goes out lumen, 13-gas outlet, 61-single filter material, 62-cascade filtration material, 63-valve B, 64-valve C, 65-one-level pipeline, 66-secondary canalization, 71-main temperature adjustment module, 72-film dehumidifying component, 73-is from temperature adjustment module, 74-blows side airduct, 75-valve D, 81-cavity, 82-flexible sheet, 83-amplifier, 84-valve A, 85-high pressure chest, 86-low pressure chamber, 87-high-voltage tube, 91-semiconductor laser transmitter, 92-lens, 93-beam shaping unit, 94-photodiode receiver A, 95-photodiode receiver B, 96-condenser, 97-taper delustring element, 98-diaphragm, 99-air intake opening, 101-microprocessor, 102-rotational speed regulation module, 103-laser signal processing module, 104-Laser Driven module, 105-alarm module, 106-power module.
 
Embodiment
For making to have a better understanding and awareness architectural feature of the present invention and effect of reaching, coordinating detailed description in order to preferred embodiment and accompanying drawing, being described as follows:
As shown in Figure 1, a kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function of the present invention, the draft tube 4 comprising detection cavity 9, control device 10, sampling pipe 2 and be connected with sampling pipe 2.Sampling pipe 2 has several thieff hatchs 1, the material of sampling pipe 2 is PVC, and sampling pipe 2 is arranged in distance aircraft hold ceiling 50mm and return air inlet place.The object being arranged in return air inlet place is to prevent the convection current of air in cargo hold from forming different air stratification and goods accumulation mode hinders flowing freely of air, the thieff hatch 1 under making gas can not arrive ceiling.Thieff hatch 1 is evenly arranged on sampling pipe 2, and it is spaced apart 0.5m.Sampling pipe 2 one end is connected with draft tube 4, and the other end is equipped with end cap, and end cap is for balancing the Smoking Seusitivity of different sampled point 1.Draft tube 4 is provided with blower fan 5, by blower fan 5, gas in aircraft hold is sucked in thieff hatch 1.All right installing gas flow detector 3 in draft tube 4, for detecting the gas flow in draft tube 4.
Control device 10 and detection cavity 9 are connected to prior art content, for reading the test data in detection cavity 9.Control device 10 is processed data by BP neural network Fire Detection Algorithm, judges whether breaking out of fire, and result is exported to alarm module 105.Control device 10 is containing microprocessor 101, power module 106, rotational speed regulation module 102, Laser Driven module 104, laser signal processing module 103 and alarm module 105, and power module 106, rotational speed regulation module 102, Laser Driven module 104, laser signal processing module 103 are all connected with microprocessor 101 with alarm module 105.Alarm module 105 is for output alarm signal, power module 106 is powered for detector, rotational speed regulation module 102 can regulate the gettering rate of blower fan 5 automatically according to the feedback signal of gas flow rate detector 3, can also judge that whether filter cartridge 6 is blocked according to the feedback signal of gas flow rate detector 3.Laser Driven module 104 drives semiconductor laser 91 transmitted beam, and laser signal processing module 103 processes for the electric signal received photodiode receiver A94 and photodiode receiver B95.Microprocessor 101 is for the treatment of laser signal, air velocity monitor signal and the opening controlling various valve, and control device 10 can also pass through RS485 communication interface by data syn-chronization to other network-termination device.
Filter cartridge 6 is built with filter material, and for carrying out filtering dust to the gas sucked, membrane dehumidifier 7 is for carrying out dehumidification treatments to the gas sucked.Membrane dehumidifier 7 comprises main temperature adjustment module 71, film dehumidifying component 72 and from temperature adjustment module 73.The membrane material of film dehumidifying component 72 is poly (ether sulfone) film, and it forms hydrogen bond by the hydroxyl that carries and reactive, hydrophilic group and hydrone, and in air-flow, other gas componant cannot be adsorbed effectively in a large number on film surface, and then realizes the effect of Separation of Water steam.Poly (ether sulfone) film has that separating property is excellent, intensity is high, film silk is not easily broken, the feature of stable chemical performance, and in temperature environment jumpy, thermal behavior keeps the feature such as stable.The membrane module of film dehumidifying component 72 is hollow fiber form, and its shell material is ABS.Main temperature adjustment module 71 is connected with film dehumidifying component 72 by pipeline, and film dehumidifying component 72 is connected with from temperature adjustment module 73 by pipeline.For narrow body aircraft hold, do not install humidity control system, aloft minimum temperature, greatly about about 5 DEG C, installed the temperature of humidity control system greatly between 5 DEG C ~ 26 DEG C.For the main hold of wide-bodied aircraft, the temperature of humidity control system is installed between 5 DEG C ~ 28 DEG C.For its Lower Deck Cargo CompAtment and bulk cargo hold, humidity control system is not installed, minimum temperature is greatly about about 5 DEG C in-flight, the temperature of humidity control system is installed greatly between 5 DEG C ~ 26 DEG C, and the intake air temperature that membrane dehumidifier 7 is suitable for is 18 DEG C, the gases at high pressure temperature therefore needing main temperature adjustment module 71 to be discharged by blower fan 5 is adjusted to 18 DEG C.Gas after regulating enters the high-pressure side (middle part of film dehumidifying component 72) of film dehumidifying component 72, flow into the effect of the on high-tension side gas of film dehumidifying component 72 by poly (ether sulfone) film, the water vapor in air spreads to the low-pressure side (two ends of film dehumidifying component 72) of film dehumidifying component 72.The pipeline of certain film dehumidifying component 72 and main temperature adjustment module 71 and with the pipeline from temperature adjustment module 73, be arranged on high-pressure side or low-pressure side, the difference of the just effect on moisture extraction brought.In order to maintain the stability that in detection cavity, smokescope is measured, a part of gas of discharging from film dehumidifying component 72 high-pressure side after dehumidifying enters from temperature adjustment module 73, from temperature adjustment module 73, the gas of discharging from high-pressure side is adjusted to 25 DEG C, gas after regulating directly enters into lumen 11, enters detection cavity 9 by entering lumen 11.Can also connect a side-blown airduct 74 from entering lumen 11, side-blown airduct 74 is connected on the low-pressure side of film dehumidifying component 72, and side-blown airduct 74 is provided with valve D75, and valve D75 is for regulating air inflow and the feed rate of sweep gas.Another part gas of discharging from film dehumidifying component 72 high-pressure side after dehumidifying enters the low-pressure side of film dehumidifying component 72 as the side-blown airduct 74 that sweep gas is passed through to connect into lumen, the water vapor of film dehumidifying component 72 low-pressure side can be taken away by sweep gas in time, and can enter draft tube 4 from opposite side opening.In addition can by the dehumidifying effect regulating the admission pressure of suction gas and feed rate and valve D75 opening degree to carry out controlling diaphragm dehumidifying component 72.
Draft tube 4 accesses filter cartridge 6, and the gas of suction is first through the filtering dust of filter cartridge 6.Filter cartridge 6 is connected with main temperature adjustment module 71 by pipeline, and the gas after filtering dust is delivered to membrane dehumidifier 7 and carried out dehumidification treatments.Pass through to be connected into lumen 11 with detection cavity 9 from temperature adjustment module 73, the gas after dedusting, dehumidification treatments enters detection cavity 9 and detects.Detection cavity 9 is provided with out lumen 12, and the gas detected passes through lumen 12 and discharges detection cavity 9.
Along with the accumulation of time, the dust assembled in detection cavity 9 can get more and more, thus affects detection accuracy, produces wrong report.In order to the dust in detection cavity 9 effectively can be removed, dust collection by sound wave device 8 can also be comprised.Dust collection by sound wave device 8 comprises cavity 81 and amplifier 83, and cavity 81 material is aluminium alloy, for fixing flexible sheet 82.Be horizontally installed with flexible sheet 82 in the middle part of cavity 81, flexible sheet 82 can be embedded on cavity 81.Flexible sheet 82 material is the titanium alloy of high strength, cavity is separated into low pressure chamber 86 and high pressure chest 85 two chambers by flexible sheet 82, low pressure chamber 86 has hole, high pressure chest 85 is connected by high-voltage tube 87 with entering between lumen 11, high-voltage tube 87 is provided with valve A84, whether flows through dust collection by sound wave device by the gas after the opening of valve A84 controls dehumidifying.Pass into the gases at high pressure into lumen 11 in high pressure chest 85, low pressure chamber 86 is identical with ambient atmosphere, and its pressure is always a standard atmospheric pressure.Amplifier 83 material is stainless steel.Amplifier 83 inlet diameter is little, and outlet diameter is large.The entrance of amplifier 83 is fixedly mounted in high pressure chest 85, and flexible sheet 82 activity is attached on the entrance of amplifier 83.Detection cavity 9 has air intake opening 99, the outlet of amplifier 83 is positioned at air intake opening 99 place of detection cavity 9.Gases at high pressure enter high pressure chest 85 by high-voltage tube 87, low pressure chamber 86 air pressure is lower than high pressure chest 85, due to the existence of pressure reduction, flexible sheet 82 bends to low pressure chamber 86, flexible sheet 82 is separated with the entrance of amplifier 83, and gases at high pressure enter amplifier 83 from flexible sheet 82 and the space of amplifier 83 entrance and air intake opening 99 through detection cavity 9 enters detection cavity 9.The discharge of gas makes high pressure chest 85 internal pressure reduce, flexible sheet 82 relies on the elasticity of self to recover the inlet contact with amplifier 83, the strong sound wave relying on this to-and-fro movement to be formed produces vibration to detection cavity 9 inside surface, thus the dust dropped on for a long time in detection cavity 9 on components and parts can be upspring, enter out lumen 12 by high-pressure blast, thus carry out dedusting.Certainly in order to ensure the dust removing effects for detection cavity 9, the quantity of dust collection by sound wave device 8 can be 2 or multiple.
Require that when carrying out dedusting to detection cavity 9 gas is high clean air, the filter material therefore in filter cartridge 6 can be made up of single filter material 61 and cascade filtration material 62.Single filter material 61, for being polyfoam, can remove in air sample the pollutants such as dust, fiber and the powder being more than or equal to 20um.Cascade filtration material 62 is HEPA, and can remove the particulate that diameter is more than 0.3um, removal efficiency can reach more than 99.7%.Draft tube 4 is connected on single filter material 61 place of filter cartridge 6, filter cartridge 6 is positioned at single filter material 61 place and is provided with one-level pipeline 65, filter cartridge 6 is positioned at cascade filtration material 62 place and is provided with secondary canalization 66, by one-level pipeline 65 blowout is ordinary high pressure gas, may be used for test; Secondary canalization 66 blows out the gases at high pressure for high cleanliness, may be used for cleaning detection cavity 9.One-level pipeline 65 is provided with valve B63, secondary canalization 66 is provided with valve C64, one-level pipeline 65 and secondary canalization 66 converge rear access main temperature adjustment module 71, thus export membrane dehumidifier 7 to, enter detection cavity 9.
In order to ensure the gas circulation in whole detector, draft tube 4 can be connected into by going out lumen 12, blower fan 5 be connected with the gas outlet 13 communicated with draft tube 4.Such formation draft tube 4, enter lumen 11, go out lumen 12, the circulation of gas outlet 13 trend.
Semiconductor laser transmitter 91 is installed in detection cavity 9, semiconductor laser transmitter 91 for wavelength be 850nm, power is 5mW, working temperature: the infrared laser of-40 DEG C ~+85 DEG C, its volume is little, lightweight, low in energy consumption, stable performance.Diffusing to be mistakened as and make acquisition of signal in order to avoid chamber wall, the whole blacking of detection cavity inwall is to improve extinction effect.In order to further increase detection accuracy, being provided with taper delustring element 97 and being positioned at the mirror image place of semiconductor laser transmitter 91 in detection cavity 9, cone delustring element 97 is for scatter measuring beam and direct projection is absorbed by inwall to the inwall of detection cavity 9.Be positioned at taper delustring element 97 two ends in detection cavity 9 and be separately installed with photodiode receiver A94 and photodiode receiver B95, the front end of photodiode receiver A94 and photodiode receiver B95 is equipped with diaphragm 98 and condenser 96 all successively, diaphragm 98 is for limiting scattered beam size, and condenser 96 is for converging the light beam of scattering.Semiconductor laser transmitter 91 is provided with lens 92, beam shaping unit 93 is installed in detection cavity 9, lens 92 and shaping unit 93 convert the light of Laser emission to directional light, and beam shaping unit 93 is near lens 92 side and be positioned at the both sides of the Laser emission line of semiconductor laser transmitter 91.When detection cavity 9 works, Laser Driven module 104 generation current drives semiconductor laser luminescence 91, light beam scioptics 92 and shaping unit 93 convert directional light to, if have smog in air sample, scattering is there is in directional light under the effect of smoke particle, these scattered light parts are received by photodiode through condenser 96 and diaphragm 98, part by cone delustring element 97 scatter and direct projection on the inwall of detection cavity 9, attracted by inwall.Scattered light signal is converted into electric signal transmission to laser signal processing module 103 by photodiode receiver A94 and photodiode receiver B95, laser signal processing module 103 pairs of signals amplify, and compare with reference signal, and result is transferred to microprocessor 101.Microprocessor 101 utilizes BP neural network Fire Detection Algorithm to process signal, and compares analysis with the threshold value preset, and the result after process is flowed to alarm module 105.
When reality uses, when valve C64, valve A84 are in closed condition, when valve B63 is in opening, this detector is in test pattern; When valve B63 be in closed condition, valve C64, valve A84 be in opening time, this detector is in detection cavity 9 cleaning model.
Under test pattern (normal mode of operation): the air sample in aircraft hold is drawn into sampling pipe 2 from thieff hatch 1 by blower fan 5, suck draft tube 4 through blower fan 5.Gas in draft tube 4 enters in filter cartridge 6, part gas enters membrane dehumidifier 7 after first order filter material 61 filters, detection cavity 9 is entered after being dehumidified by membrane dehumidifier 7, if containing smoke particle in the air sample in detection cavity 9, the light beam that laser is sent is produced scattering by smoke particle, scattered light is transported to control device 10 after light signal being converted into electric signal after being received by photodiode receiver A94 and photodiode receiver B95, control device 10 judges whether breaking out of fire, and result is exported to warning device 105.After detection completes, gas passes through lumen 12 and enters draft tube 4, and the gas outlet 13 finally by blower fan drains into aircraft hold.
In a cleaning mode, gas in draft tube 4 enters in filter cartridge 6, successively after single filter material 61 and cascade filtration material 62 filter, enter membrane dehumidifier 7, by membrane dehumidifier 7 dehumidify laggard enter sound wave dust arrester 8, gas enters detection cavity 9 through dust collection by sound wave device 8, flexible sheet 82 now in dust collection by sound wave device 8 moves due to pressure reduction change, evokes the dust in detection cavity 9, thus removes the particles such as the dust on detection cavity 9 inside surface.By high-pressure blast, the particles such as dust being blown into out lumen 12, entering the draft tube 4 of detector by going out lumen 12, the gas outlet 13 finally by blower fan 5 drains in aircraft hold.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; the just principle of the present invention described in above-described embodiment and instructions; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in claimed scope of the present invention.The protection domain of application claims is defined by appending claims and equivalent thereof.

Claims (6)

1. one kind has the air suction type aircraft hold fire detector of dehumidifying and dedusting function, comprise detection cavity (9), control device (10), sampling pipe (2) and the draft tube (4) be connected with sampling pipe (2), described sampling pipe (2) has several thieff hatchs (1), draft tube (4) is provided with blower fan (5), described control device (10) is connected with detection cavity (9), it is characterized in that: also comprise filter cartridge (6) and membrane dehumidifier (7), filter cartridge (6) is built with filter material, membrane dehumidifier (7) comprises main temperature adjustment module (71), film dehumidifying component (72) and from temperature adjustment module (73), main temperature adjustment module (71) is connected with film dehumidifying component (72) by pipeline, film dehumidifying component (72) is connected with from temperature adjustment module (73) by pipeline, described draft tube (4) access filter cartridge (6), filter cartridge (6) is connected with main temperature adjustment module (71) by pipeline, pass through to be connected into lumen (11) with detection cavity (9) from temperature adjustment module (73), detection cavity (9) is provided with out lumen (12).
2. a kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function according to claim 1, it is characterized in that: also comprise dust collection by sound wave device (8), dust collection by sound wave device (8) comprises cavity (81) and amplifier (83), cavity (81) middle part is horizontally installed with flexible sheet (82), cavity is separated into low pressure chamber (86) and high pressure chest (85) by flexible sheet (82), (86) have hole to low pressure chamber, high pressure chest (85) is connected by high-voltage tube (87) with entering between lumen (11), (87) are provided with valve A(84 with high-voltage tube), the entrance of amplifier (83) is fixedly mounted in high pressure chest (85), flexible sheet (82) activity is attached on the entrance of amplifier (83), detection cavity (9) has air intake opening (99), the outlet of amplifier (83) is positioned at air intake opening (99) place of detection cavity (9).
3. a kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function according to claim 1, it is characterized in that: the filter material in described filter cartridge (6) is made up of single filter material (61) and cascade filtration material (62), draft tube (4) is connected on single filter material (61) place of filter cartridge (6), filter cartridge (6) is positioned at single filter material (61) place and is provided with one-level pipeline (65), filter cartridge (6) is positioned at cascade filtration material (62) place and is provided with secondary canalization (66), (65) are provided with valve B(63 to one-level pipeline), (66) are provided with valve C(64 to secondary canalization), one-level pipeline (65) and secondary canalization (66) converge rear access main temperature adjustment module (71).
4. a kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function according to claim 1, it is characterized in that: the described lumen (12) that goes out is connected into draft tube (4), described blower fan (5) is connected with the gas outlet (13) communicated with draft tube (4).
5. a kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function according to claim 1, it is characterized in that: in described detection cavity (9), semiconductor laser transmitter (91) is installed, taper delustring element (97) is installed in detection cavity (9) and is positioned at the mirror image place of semiconductor laser transmitter (91), be positioned at taper delustring element (97) two ends in detection cavity (9) and be separately installed with photodiode receiver A(94) and photodiode receiver B(95), photodiode receiver A(94) and photodiode receiver B(95) front end diaphragm (98) and condenser (96) are housed all successively, semiconductor laser transmitter (91) is provided with lens (92), beam shaping unit (93) is installed in detection cavity (9), beam shaping unit (93) is near lens (92) side and be positioned at the both sides of the Laser emission line of semiconductor laser transmitter (91).
6. a kind of air suction type aircraft hold fire detector with dehumidifying and dedusting function according to claim 3, it is characterized in that: described single filter material (61) is polyfoam, described cascade filtration material (62) is HEPA.
CN201410696274.9A 2014-11-27 2014-11-27 Air-suction-type plane cargo compartment fire disaster detector with dehumidifying and dedusting functions Pending CN104408864A (en)

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