CN202495128U - Reflection type point pattern optical fiber temperature-sensitive fire detector - Google Patents
Reflection type point pattern optical fiber temperature-sensitive fire detector Download PDFInfo
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- CN202495128U CN202495128U CN2012201482351U CN201220148235U CN202495128U CN 202495128 U CN202495128 U CN 202495128U CN 2012201482351 U CN2012201482351 U CN 2012201482351U CN 201220148235 U CN201220148235 U CN 201220148235U CN 202495128 U CN202495128 U CN 202495128U
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Abstract
The utility model provides a reflection type point pattern optical fiber temperature-sensitive fire detector, which comprises a transmitting optical cable, a receiving optical cable and an outer pipe, wherein an optical fiber sleeve and a reflecting column are respectively sleeved in two ends of the outer pipe, the transmitting optical cable and the receiving optical cable which are parallel with the inner end surface of the optical fiber sleeve are inserted into the optical fiber sleeve, one end of the transmitting optical cable is connected with a light source modulated by a light source modulator, one end of the receiving optical cable is connected with a signal detecting processor, a head end surface of the reflecting column is arranged opposite to the inner end surface in the outer pipe, and is provided with a reflecting film, the top part of the head end surface is provided with a light shielding sheet, one end of the light shielding sheet is connected with a temperature sensing element, and the other end is extended to the middle between the head end surface and the inner end surface. During the manufacture of the reflection type point pattern optical fiber temperature-sensitive fire detector, a distance between the reflecting film and the end surfaces of the ends on the transmitting optical cable and the receiving optical cable which are parallel with the inner end surface is to be determined firstly, then lengths of other components are to be determined. The reflection type point pattern optical fiber temperature-sensitive fire detector designed by the utility model has the advantages of good positioning performance, high sensitivity, temperature warning value which can be set arbitrary within a range of 35 DEG C to 85 DEG C, simple structure, low production and maintenance costs, and high security.
Description
Technical field
The utility model relates to a kind of automatic fire alarm equipment; Relate in particular to a kind of reflective some type temperature detected by optical fiber fire detector; Specifically be applicable to the defective of eliminating electronic devices and components, reduce cost, improve sensitivity, maintain easily; The temperature alarming value can be provided with arbitrarily in 85 ℃ of 35 ℃ –, has great practicality.
Background technology
At present; The hygrosensor that is used for both at home and abroad on the automatic fire alarm mainly contains electronic type point type constant temperature fire detector, cable type linetype temperature-fixing fire detecting device, electronic type differential fire detector, Electronic Difference, linear optical fiber heat fire detector, and their defective is following:
The problem that electronic type point type constant temperature fire detector exists is:
because electric signal is arranged; Place inflammable and explosive, that electromagnetic radiation intensity is big is inappropriate for installation; It is aging to exist certain potential safety hazard
electronic devices and components to be prone to; Aging back is prone to produce wrong report even malfunctioning
detector cost is high; High
the actuation of an alarm temperature range of later maintenance cost is wide, causes sensitivity low.
The problem that cable type linetype temperature-fixing fire detecting device exists is:
because electric signal is arranged; Place inflammable and explosive, that electromagnetic radiation intensity is big is inappropriate for installation; It is aging to exist certain potential safety hazard
electronic devices and components to be prone to; Aging back is prone to produce wrong report even malfunctioning
detector cost is high; Mostly the positioning performance poor
that high
fire of maintenance cost produces the position is irrecoverable type, can not reuse.
The problem that the electronic type differential fire detector exists is:
because electric signal is arranged; Be inappropriate for installation in inflammable and explosive, the big place of electromagnetic radiation intensity; It is aging to exist certain potential safety hazard
electronic devices and components to be prone to; Aging back is prone to produce wrong report even malfunctioning
detector cost is high; High
the temperature-responsive time of maintenance cost is longer, and sensitivity is low.
The problem that Electronic Difference exists is:
because electric signal is arranged; Place inflammable and explosive, that electromagnetic radiation intensity is big is inappropriate for installation; It is aging to exist certain potential safety hazard
electronic devices and components to be prone to; Aging back is prone to produce wrong report even malfunctioning
panel detector structure is very complicated, cost is very high, and maintenance cost is very high.
The problem that the linear optical fiber heat fire detector exists is:
panel detector structure is very complicated, cost is very high; Maintenance cost is also very high; Customer consumption do not rise
main cable fracture appears or come off after can cause all detectors to lose efficacy; Risk is big; Relatively poor
the temperature-responsive time of positioning performance of security lower
fire generation position is longer, and sensitivity is low.
The utility model content
The purpose of the utility model is to overcome the employing complex structure that exists in the prior art, defective and the problem that the production maintenance cost is very high, security is lower, positioning performance is relatively poor, sensitivity is lower; Provide a kind of simple in structure, the production maintenance cost is very low, security is higher, positioning performance is better, sensitivity is higher, the temperature alarming value can be provided with arbitrarily within the specific limits, reflective some type temperature detected by optical fiber fire detector.
For realizing above purpose; The technical solution of the utility model is: reflective some type temperature detected by optical fiber fire detector; Comprise the emission optical cable, receive optical cable and outer tube, an end of said emission optical cable with modulate through light modulator after light source be connected, an end of said reception optical cable is connected with the input processor; The other end of emission optical cable, reception optical cable all extends in the outer tube, and in outer tube, is provided with temperature-sensing element;
The inside at said outer tube two ends has been inserted in ferrule and reflection post respectively; Be inserted with the emission optical cable of ferrule inner face flush in the optical fiber cavity in the said ferrule, receive optical cable, the outer face of ferrule extends to the outside of outer tube, and the head end face of said reflection post is oppositely arranged with the inner face of ferrule in outer tube; The breech face of reflection post extends to the outside of outer tube; The head end face is provided with reflectance coating, and the top of reflectance coating is provided with light barrier, and the temperature-sensing element that is provided with on an end of light barrier and the reflection post side is connected; The other end extends between head end face, the inner face, and the nearly head end face of temperature-sensing element is provided with;
Said outer tube is the temperature sensitive type sleeve pipe, and said temperature-sensing element is a temperature-sensitive deformation element, and said emission optical cable, reception optical cable are with a kind of optical cable.
Said reflection post is provided with and the corresponding skewed slot of temperature-sensing element, and the high-end caudal part face of skewed slot is provided with, and the low side of skewed slot communicates with the bayonet socket that head end face top is offered, and card has light barrier in this bayonet socket.
The breech face of said reflection post is connected with limited post, and the end face diameter of limited post is greater than the end face diameter of reflection post.
The outer face of said ferrule is connected with spacing optical fiber tube, and the set inside of spacing optical fiber tube has No. two optical fiber cavities coaxial with an optical fiber cavity, and on the inwall of spacing optical fiber tube, is symmetrically arranged with a pair of optical fiber card article.
Said light source is LASER Light Source or led light source, and said emission optical cable, reception optical cable are quartzy optical cable or plastic optical fiber cable.
Said light source is the green LED light source, and said emission optical cable, reception optical cable are the communication stage plastic optical fiber cable.
The diameter of said emission optical cable, reception optical cable internal optical fiber is 1 millimeter, and the distance between said head end face, the inner face is 2.5 millimeters of 2 –, and an end of said light barrier is connected with temperature-sensing element, and the distance between the other end and the head end face is less than 2 millimeters.
The manufactured materials of said outer tube is a metal; The manufactured materials of said light barrier is a metal, and its thickness is smaller or equal to 0.1 millimeter; The manufactured materials of said ferrule, reflection post is plastics.
Compared with prior art, the beneficial effect of the utility model is:
1, the fire detector of taking in reflective some type temperature detected by optical fiber of the utility model fire detector is some type optic fibre fire detector, and wherein, temperature detected by optical fiber can be stopped the defective of electric signal, electronic devices and components temperature-sensitive, improves the security and the permanance of device; The positioning performance of some type temperature-sensitive is very good, the particular location of the generation of definite fire that can be very fast.Therefore the utility model can not only be stopped the defective of electric signal, electronic devices and components temperature-sensitive, and security is higher, positioning performance is better.
2, the fire detector of taking in reflective some type temperature detected by optical fiber of the utility model fire detector has utilized the principle of fiber reflection, that is: the light of emission optical cable emission is injected the reception optical cable after the reflectance coating reflection, simultaneously; Outer tube is given temperature-sensing element with the temperature conduction of surrounding environment, and when temperature rose, temperature-sensing element can produce deformation and bending gradually; Drive light barrier simultaneously and move down, and block reflectance coating, die down thereby cause receiving the light intensity that optical cable receives; And then the light intensity that causes delivering to the input processor dies down, and comes detecting temperature by intensity variations, and not only the reaction time is very short, sensitivity is higher; Can be in ± 1 ℃, and simple in structure with the alarm temperature error control, be convenient to produce and safeguard; Cost is lower, and in addition, outer tube in use is a full-closed structure; Not only can improve the sensitivity of temperature-sensing element temperature-sensitive in the pipe, and part in the ability better protect pipe, security is higher.Therefore not only sensitivity is higher, simple in structure for the utility model, and the temperature alarming value can be provided with arbitrarily in 85 ℃ of 35 ℃ –, and the production maintenance cost is very low, security is higher.
3, the light source in reflective some type temperature detected by optical fiber of the utility model fire detector is lasing light emitter or led light source; The emission optical cable, to receive optical cable be quartzy optical cable or plastic optical fiber cable, especially when light source be the green LED light source, the emission optical cable, effect is best when receiving optical cable and being the communication stage plastic optical fiber cable; The advantage of green light LED and the collocation of communication stage plastic optical fiber cable is following: at first; Under equal power condition, the furthest that green light LED transmits in the communication stage plastic optical fiber cable can reach 350 meters of one way 300 –; Secondly, the price of green light LED is very cheap, and WV is little; Can satisfy fire protection warning product regulation supply voltage is that 24V, product standby power supply must satisfy the requirement of supplying power continually and steadily more than 8 hours after the dispatch from foreign news agency outage, and LED utilizes the charge carrier spontaneous radiation recombination luminescence that is injected with the source region; Do not have threshold property, be not vulnerable to voltage fluctuation and temperature fluctuation influence, stability is stronger; But more than the continuous working 100,000 hours (about 11.5), the life-span is very long; Once more, the communication stage plastic optical fiber cable is attenuation coefficient≤0.2dB/m not only, and transmission range is longer; And the diameter of the optical fiber of its parcel is 1mm; There is enough big area to let optically-coupled as much as possible advance fibre core and transmits, can improve light intensity and transmission range, in addition; The communication stage plastic optical fiber cable is compared with the quartzy optical cable of communication stage commonly used, and price has only 1/10th; At last, can the be multiplexing a plurality of front end detection of 1 green light LED portion, thereby can further reduce cost.Therefore not only cost is very low, transmission range is long for the utility model, and stability by force, can satisfy in the fire protection warning product needs to transmission range.
4, launch optical cable, the end face that receives equal homogeneous end with inner face on the optical cable and the distance between the reflectance coating
in reflective some type temperature detected by optical fiber of the utility model fire detector according to specific formulae design; This formula can demonstrate the relation between receiving light power and
; Relation can be designed best
value scope and obtain the strongest receiving light power to guarantee the utility model according to this; Receiving light power is strong more; Sensitivity is high more naturally; Block light intensity through light barrier this moment again; Just can obtain the temperature of surrounding environment comparatively fast, more accurately, thereby improve the sensitivity of the utility model temperature-sensitive.Therefore the sensitivity of the utility model is higher.
5, fire detector mainly comprises outer tube, ferrule, reflection post, temperature-sensing element and reflectance coating in reflective some type temperature detected by optical fiber of the utility model fire detector; Not only amount of parts is less; It is clear to arrange; And manufactured materials is common materials, cheaply is easy to get, and is convenient to reduce the production maintenance cost.Therefore the utility model is not only simple in structure, and the production maintenance cost is very low.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the structural representation of ferrule among Fig. 1.
Fig. 3 is the structural representation of reflection post among Fig. 1.
Figure 4 is the utility model in
and
a schematic representation.
Figure 5 is the utility model in
and
. Figure
Among the figure: light source 1, light modulator 2, input processor 3, emission optical cable 4, receive optical cable 5, outer tube 6, temperature-sensing element 7, ferrule 8, inner face 81, outer face 82, an optical fiber cavity 83, reflection post 9, head end face 91, breech face 92, reflectance coating 10, light barrier 11, skewed slot 12, bayonet socket 13, limited post 14, spacing optical fiber tube 15, No. two optical fiber cavity 151, optical fiber card article 152.
Embodiment
Below in conjunction with description of drawings and embodiment the utility model is done further detailed explanation.
Referring to figure 1 – Fig. 5; Reflective some type temperature detected by optical fiber fire detector; Comprise emission optical cable 4, receive optical cable 5 and outer tube 6, an end of said emission optical cable 4 with modulate through light modulator 2 after light source 1 be connected, an end of said reception optical cable 5 is connected with input processor 3; The other end of emission optical cable 4, reception optical cable 5 all extends in the outer tube 6, and in outer tube 6, is provided with temperature-sensing element 7;
The inside at said outer tube 6 two ends has been inserted in ferrule 8 and reflection post 9 respectively; Be inserted with emission optical cable 4, reception optical cable 5 in the optical fiber cavity 83 in the said ferrule 8 with ferrule 8 inner faces 81 flush; The outer face 82 of ferrule 8 extends to the outside of outer tube 6; The head end face 91 of said reflection post 9 is oppositely arranged with the inner face 81 of ferrule 8 in outer tube 6, and the breech face 92 of reflection post 9 extends to the outside of outer tube 6, and head end face 91 is provided with reflectance coating 10; The top of reflectance coating 10 is provided with light barrier 11; The temperature-sensing element 7 that is provided with on one end of light barrier 11 and reflection post 9 sides is connected, and the other end extends between head end face 91, the inner face 81, and temperature-sensing element 7 near head end faces 91 settings;
Said outer tube 6 is temperature sensitive type sleeve pipes, and said temperature-sensing element 7 is temperature-sensitive deformation elements, and said emission optical cable 4, to receive optical cable 5 be with a kind of optical cable.
Said reflection post 9 is provided with and temperature-sensing element 7 corresponding skewed slots 12, and the high-end caudal part face 92 of skewed slot 12 is provided with, and the low side of skewed slot 12 communicates with the bayonet socket 13 that head end face 91 tops are offered, and card has light barrier 11 in this bayonet socket 13.
The breech face 92 of said reflection post 9 is connected with limited post 14, and the end face diameter of limited post 14 is greater than the end face diameter of reflection post 9.
The outer face 82 of said ferrule 8 is connected with spacing optical fiber tube 15, and the set inside of spacing optical fiber tube 15 has No. two optical fiber cavities 151 coaxial with an optical fiber cavity 83, and on the inwall of spacing optical fiber tube 15, is symmetrically arranged with a pair of optical fiber card article 152.
Said light source 1 is LASER Light Source or led light source, and said emission optical cable 4, to receive optical cable 5 be quartzy optical cable or plastic optical fiber cable.
Said light source 1 is the green LED light source, and said emission optical cable 4, to receive optical cable 5 be the communication stage plastic optical fiber cable.
Said emission optical cable 4, the diameter that receives optical cable 5 internal optical fibers are 1 millimeter; Distance between said head end face 91, the inner face 81 is 2.5 millimeters of 2 –; One end of said light barrier 11 is connected with temperature-sensing element 7, and the distance between the other end and the head end face 91 is less than 2 millimeters.
The manufactured materials of said outer tube 6 is a metal; The manufactured materials of said light barrier 11 is a metal, and its thickness is smaller or equal to 0.1 millimeter; The manufactured materials of said ferrule 8, reflection post 9 is plastics.
A kind of manufacturing approach of above-mentioned reflective some type temperature detected by optical fiber fire detector, this manufacturing approach may further comprise the steps successively:
The first step: confirm earlier emission optical cable 4, receive on the optical cable 5 end face and the distance between the reflectance coating 10
with inner face 81 equal homogeneous ends;
equals the distance between the head end face 91 of inner face 81 and reflection post 9 of ferrule 8, and
confirms according to following two formula:
，
Wherein,
is for receiving the light intensity that optical cable 5 receives;
is the light intensity of emission optical cable 4 emissions;
for emission optical cable 4, receive on the optical cable 5 and the end face of inner face 81 equal homogeneous ends and the distance between the reflectance coating 10;
is the radius of emission optical cable 4, reception optical cable 5 internal optical fibers;
is the maximum aperture angle of optical fiber;
is the reflectivity of reflectance coating 10;
is light source kind and the light source modulation parameter with optical fiber coupling situation, and the light that
sends for emission optical cable (4) is incident upon reflectance coating (10) and goes up 2 times of spot radius;
Confirm the length of light barrier 11, ferrule 8, reflection post 9 and outer tube 6 again according to
;
Second step: will launch optical cable 4 earlier, receive in the optical fiber cavity 83 in the optical cable 5 reeve ferrules 8; Emission optical cable 4, the end face that receives optical cable 5 and inner face 81 flush of ferrule 8; Ferrule 8 is inserted an end of outer tube 6, after the insertion, inner face 81 is positioned at the inside of outer tube 6 again;
The 3rd step: earlier reflectance coating 10 is attached on the head end face 91 of reflection post 9; On the side of reflection post 9, temperature-sensing element 7 is set again, an end of nearly head end face 91 is pasted light barrier 11 on temperature-sensing element 7 then, and the other end of light barrier 11 extends between head end face 91, the inner face 81; Light barrier 11 is positioned at the top of reflectance coating 10; To reflect the other end that post 9 inserts outer tube 6 again, after the insertion, head end face 91 is positioned at the inside of outer tube 6; With the closed at both ends of outer tube 6, can accomplish the manufacturing of reflective some type temperature detected by optical fiber fire detector this moment at last.
In the said first step; The diameter of emission optical cable 4, reception optical cable 5 internal optical fibers is 1 millimeter; Said
is 2.5 millimeters of 2 –; One end of said light barrier 11 is connected with temperature-sensing element 7, and the distance between the other end and the head end face 91 is less than 2 millimeters.
The principle of the utility model is explained as follows:
One, confirming of
:
Referring to Fig. 4; Visible by figure; The light that sends of emission optical cable 4 is incident upon reflectance coating 10 after passing distance
(promptly launch optical cable 4, receive on the optical cable 5 and the end face of inner face 81 equal homogeneous ends and the distance between the reflectance coating 10); After the film 10 that is reflected reflects; Reflected light is incident upon and receives optical cable 5;
among the figure is for receiving the light intensity that optical cable 5 receives;
is the light intensity of emission optical cable 4 emissions;
for emission optical cable 4, receive on the optical cable 5 and the end face of inner face 81 equal homogeneous ends and the distance between the reflectance coating 10;
is the radius of emission optical cable 4, reception optical cable 5 internal optical fibers;
is the maximum aperture angle of optical fiber;
is the reflectivity of reflectance coating 10;
is light source kind and the light source modulation parameter with optical fiber coupling situation, and the light that
sends for emission optical cable (4) is incident upon reflectance coating (10) and goes up 2 times of spot radius; Then have
Visible by above-mentioned formula;
is big more; Light intensity is big more, and detector is sensitiveer.Behind the utility model selected light, optical cable, reflectance coating 10;
,
,
,
,
,
are definite value; The value that will improve
this moment; Just must change
; Relation between the two sees also Fig. 5; Visible by Fig. 5; When
value is got surely a certain scope;
can reach maximum, and sensitivity is the highest.The best engineering usable range that the utility model combines this formulae design to go out
value is 2 – 2.5mm;
maximum that obtain this moment, sensitivity is the highest.
Two, the design of light barrier:
An end of light barrier 11 is connected with temperature-sensing element 7 in the utility model, and the other end extends between head end face 91, the inner face 81, in the use; When temperature-sensing element 7 rose deformation gradually to bending because of temperature, the light barrier 11 that temperature-sensing element 7 drives the stickup of one of which ends moved down, and is incident upon the light on the reflectance coating 10 with minimizing; Be equal to and reduced reflectivity; Thereby reduce to receive the light intensity that optical cable 5 receives, and then the light intensity that causes delivering to input processor 3 dies down, just can detect temperature by intensity variations this moment; When temperature arrives the setting threshold values, just report to the police.
For guaranteeing to realize design effect, light barrier 11 required thicknesses are no more than 0.1mm, and metal (like steel, aluminium, copper, silver, zinc, manganese and alloy thereof) has rigidity, is difficult for deformation.Simultaneously; By on can know; The best engineering usable range of
value is 2 – 2.5mm; Thereby the distance between the other end of light barrier 11 and the head end face 91 if surpass 2 millimeters, then can influence 11 pairs of catoptrical occlusion effects of light barrier less than 2 millimeters.
Three, green light LED and communication stage plastic optical fiber cable:
1, green light LED:
The advantage of light signal: green light LED is green light LED; What it transmitted in the communication stage plastic optical fiber cable is light signal; Even if having high voltage or very strong terrestrial magnetic field also can not influence around the communication stage plastic optical fiber cable to the light signal generating in the optical cable; Comparatively speaking, electric signal but is easy to receive high voltage or terrestrial magnetic field and disturbs, and causes distorted signals and produces wrong report; In addition; Electric signal is inappropriate for installation in the place inflammable and explosive, that electromagnetic radiation intensity is big, has certain potential safety hazard, and the electronic devices and components that produce electric signal also are prone to aging; And be prone to produce wrong report even malfunctioning in aging back, the green light LED that the utility model adopts can both be avoided these defectives.
Stability: the green light LED utilization is injected with the charge carrier spontaneous radiation recombination luminescence in source region; Do not have threshold property, spectral concentration is than the high several magnitude of LASER Light Source, and stability is stronger; And LASER Light Source is the stimulated radiation recombination luminescence; Have optical resonator, be easy to receive voltage fluctuation and temperature fluctuation influence, it is very serious to cause LASER Light Source light decay and temperature to be floated.Therefore the stability of green light LED is far above LASER Light Source.
Price advantage: general 20 milliwatts of power of the green light LED that the utility model adopts, WV is about 3V, and working current is less than 10 milliamperes; 1 green light LED can multiplexing a plurality of reflection type optical fiber smoke transducers, its market price be 0.09 yuan/individual, and the LASER Light Source of 20 milliwatts; High voltage supply; About 150 milliamperes of working current, its market price are 20 milliwatt green light LED market price more than 1500 times, and volume is very big.
The fire protection warning product requirement: the supply voltage of national regulation fire protection warning product is 24V; High pressure can not be provided; And the standby power supply of mandatory provisions product must satisfy after dispatch from foreign news agency outage supplies power more than 8 hours continually and steadily, and LASER Light Source not only needs high voltage supply, and in the consideration practicality and cheaply under the condition; If the light source of detector 1 adopts LASER Light Source, then be difficult to its standby power supply of assurance and after the dispatch from foreign news agency outage, can supply power continually and steadily 8 hours.
Serviceable life: but more than the green light LED life-span continuous working 100,000 hours (about 11.5), but LASER Light Source continuous workings 7500 hours (about 1 month) at most.
Therefore the LASER Light Source of comparing, the utility model take green light LED as light source 1; Not only can satisfy the fire protection warning product requirement, stability is stronger; And serviceable life is longer, and especially price is very cheap, has improved the cost performance of the utility model greatly.
2, communication stage plastic optical fiber cable:
The inside of communication stage plastic optical fiber cable is wrapped with communication stage optical fiber, in practical application, need peel off a bit of protective sleeve in communication stage plastic optical fiber cable surface is convenient to continue except positions such as joints, and all the other positions all are shown as the communication stage plastic optical fiber cable.Replace the electric wire in the existing product with the communication stage plastic optical fiber cable, low energy consumption, the low pollution, cost is lower, meets the industry policy of country's " light advance copper moves back and energy-saving and emission-reduction ".
Fibre diameter compares: smoke fire detector utilizes light scattering to smoke detection, and this just requires to be scattered, and light intensity is big as far as possible, and the size of light intensity is directly related with the diameter of optical fiber, and fibre diameter can let light entering fibre core as much as possible transmit greatly; Communication stage plastic optical fiber diameter is 1mm, and communication stage silica fibre diameter is 0.125mm then, differs 8 times, under the light source of same power; The communication stage silica fibre because diameter too little, its internal transmission light intensity too a little less than, be not suitable for detection smog; If must survey smog, carry out optical signal transmission with regard to adopting the silica fibre of bunchy, will increase difficulty and the cost that end face is handled this moment; The diameter of silica fibre has only 0.125mm, and is not only thin but also soft, and its end face is handled not only accuracy requirement height, length consuming time; And the quality that end face is handled needs specialized equipment just can detect, and processing cost is very high, and has adopted fibre bundle; This meaning will be handled a large amount of silica fibres, and consuming time longer, cost is higher.Comparatively speaking, the communication stage plastic optical fiber cable that the utility model adopts has 1mm owing to diameter, and certain degree of hardness is arranged, and its end face is handled with the naked eye just can judge quality, and only need handle one, and one just can be satisfied the requirement of surveying smog after all.
Attenuation coefficient compares: smoke fire detector comprises front end detection portion 11 and background process portion 12; Front end detection portion 11 need be arranged on the occasion of easy breaking out of fire to detect; And backstage handling part 12 needs long at interval distance to carry out data processing; Connect through optical cable between the two, this just requires optical cable to have lower attenuation coefficient to support the longer-distance transmission of light signal.Attenuation coefficient≤the 0.2dB/m of the communication stage plastic optical fiber cable that the utility model adopts can satisfy in the fire alarm requirement to transmission range.
Price comparison: on the market, homemade communication stage plastic optical fiber cable price is 0.3 yuan/m of 0.2 –, and the quartzy optical cable price of homemade communication stage is 3 yuan/m, and price differs 10 times.
Therefore the communication stage plastic optical fiber cable diameter that the utility model adopts is big, attenuation coefficient is little, not only can improve the intensity of light signal, and can carry out remote optical signal transmission, and price is also very cheap, and cost performance is very high.
3, the collocation of green light LED, communication stage plastic optical fiber cable:
The utility model green light LED as light source 1, communication stage plastic optical fiber cable as the reason of transmission cable except their advantages separately; Also be the collocation advantage of green light LED, communication stage plastic optical fiber cable: for the LED of different colours; Under constant power; The decay of green light LED in the communication stage plastic optical fiber cable is minimum, and transmission range farthest.
Simultaneously, the green light LED diameter is 5mm, and the diameter of communication stage plastic optical fiber cable is 1mm; Only need let the end face of optical fiber 10 directly aim at green light LED just in the production, not need expensive optical device and light path to regulate, simple to operate; Be convenient to volume production, and the silica fibre diameter has only 0.125mm, it must could send into the transmission of silica fibre the inside to the light that light source 1 sends as far as possible by condenser lens; Complicated operation, cost is high, is not suitable for volume production.
If with LASER Light Source and the collocation of communication stage plastic optical fiber cable, its shortcoming is: mainly be that the LASER Light Source price is too high, the market competitiveness is too poor, and the LASER Light Source volume is big, power consumption big, poor stability.
If the LED of other colors is arranged in pairs or groups with the communication stage plastic optical fiber cable, its shortcoming is: under the identical power conditions, have only green light LED in the communication stage plastic optical fiber cable transmission range farthest, the LED transmission range of other colors is too short, is not suitable for reality.
If with green light LED and the collocation of other optical cable; Its shortcoming is: the minimum optical wavelength of decay is 850nm, 1310nm, 1550nm in the silica fibre, and the wavelength of green glow is 532nm, thereby green glow is decayed very big in silica fibre; Transmission range is limited, is not suitable for reality.
Four, outer tube, ferrule, reflection post and temperature-sensing element:
Outer tube: outer tube 6 is the temperature sensitive type sleeve pipe, can temperature conduction inlet pipe with external environment condition in so that temperature-sensing element 7 is surveyed.The manufactured materials of outer tube 6 is a metal, like heat-conducting metals such as steel, iron, aluminium.
Ferrule: the outer face 82 of ferrule 8 is connected with spacing optical fiber tube 15; The length that spacing optical fiber tube 15 may command ferrules 8 get into outer tube 6; Simultaneously, grasping that symmetrically arranged a pair of optical fiber card article 152 can be tighter on spacing optical fiber tube 15 inwalls launched optical cable 4, received optical cable 5.The manufactured materials of ferrule 8, spacing optical fiber tube 15 is preferably plastics.
The reflection post: the breech face 92 of reflection post 9 is connected with limited post 14, the length that limited post 14 may command reflection post 9 gets into outer tube 6.The manufactured materials of reflection post 9, limited post 14 is preferably plastics.
Temperature-sensing element: temperature-sensing element 7 is temperature-sensitive deformation elements, and under the situation that temperature rises around, temperature-sensing element 7 can produce deformation and bending gradually, moves down to drive light barrier.
Embodiment:
Light source 1 is the green LED light source, and emission optical cable 4, reception optical cable 5 are the communication stage plastic optical fiber cable, and the diameter of optical fiber is 1 millimeter in emission optical cable 4, the reception optical cable 5; Emission optical cable 4, ferrule 8, spacing optical fiber tube 15, reception optical cable 5, reflection post 9, limited post 14, temperature-sensing element 7, light barrier 11 constitute an absolute construction with outer tube 6; This absolute construction and light source 1, light modulator 2, input processor 3 are separate, and light source 1 multiplexing a plurality of described absolute construction simultaneously;
Reflective some type temperature detected by optical fiber fire detector comprises emission optical cable 4, receives optical cable 5 and outer tube 6, an end of said emission optical cable 4 with modulate through light modulator 2 after light source 1 be connected; One end of said reception optical cable 5 is connected with input processor 3; The inside at said outer tube 6 two ends has been inserted in ferrule 8 and reflection post 9 respectively, is inserted with the emission optical cable 4 of ferrule 8 inner faces 81 flush in the optical fiber cavity 83 in the said ferrule 8, receives optical cable 5, and outer face 82 is connected with the spacing optical fiber tubes 15 that are positioned at outer tube 6 outsides; The set inside of spacing optical fiber tube 15 has No. two optical fiber cavities 151 coaxial with an optical fiber cavity 83; Be symmetrically arranged with a pair of optical fiber card article 152 on the inwall of spacing optical fiber tube 15, the end face diameter of spacing optical fiber tube 15 is greater than the end face diameter of ferrule 8, and the head end face 91 of said reflection post 9 is oppositely arranged with the inner face 81 of ferrule 8 in outer tube 6; Breech face 92 is connected with the limited posts 14 that are positioned at outer tube 6 outsides; The end face diameter of limited post 14 is greater than the end face diameter of reflection post 9, and head end face 91 is provided with reflectance coating 10, and the top of reflectance coating 10 is provided with light barrier 11; The temperature-sensing element 7 that is provided with on one end of light barrier 11 and reflection post 9 sides is connected; The other end extends between head end face 91, the inner face 81, and temperature-sensing element 7 is arranged in the skewed slot 12 on reflection post 9 sides, and the high-end caudal part face 92 of skewed slot 12 is provided with; The low side of skewed slot 12 communicates with the bayonet socket 13 that head end face 91 tops are offered, and card has light barrier 11 in this bayonet socket 13;
Distance between said head end face 91, the inner face 81 is 2.5 millimeters of 2 –, and an end of said light barrier 11 is connected with temperature-sensing element 7, and the distance between the other end and the head end face 91 is less than 2 millimeters.
A kind of manufacturing approach of above-mentioned reflective some type temperature detected by optical fiber fire detector, this manufacturing approach may further comprise the steps successively:
The first step: confirm earlier emission optical cable 4, receive on the optical cable 5 end face and the distance between the reflectance coating 10
with inner face 81 equal homogeneous ends;
equals the distance between the head end face 91 of inner face 81 and reflection post 9 of ferrule 8, and
confirms according to following two formula:
Wherein,
is for receiving the light intensity that optical cable 5 receives;
is the light intensity of emission optical cable 4 emissions;
for emission optical cable 4, receive on the optical cable 5 and the end face of inner face 81 equal homogeneous ends and the distance between the reflectance coating 10;
is the radius of emission optical cable 4, reception optical cable 5 internal optical fibers;
is the maximum aperture angle of optical fiber;
is the reflectivity of reflectance coating 10;
is light source kind and the light source modulation parameter with optical fiber coupling situation, and the light that
sends for emission optical cable (4) is incident upon reflectance coating (10) and goes up 2 times of spot radius;
after confirming is 2.5 millimeters of 2 –, confirms the length of light barrier 11, ferrule 8, reflection post 9 and outer tube 6 again according to
;
Second step: will launch optical cable 4 earlier, receive in the optical fiber cavity 83 in the optical cable 5 reeve ferrules 8; Emission optical cable 4, the end face that receives optical cable 5 and inner face 81 flush of ferrule 8; Ferrule 8 is inserted an end of outer tube 6, after the insertion, inner face 81 is positioned at the inside of outer tube 6 again;
The 3rd step: earlier reflectance coating 10 is attached on the head end face 91 of reflection post 9; On the side of reflection post 9, temperature-sensing element 7 is set again, an end of nearly head end face 91 is pasted light barrier 11 on temperature-sensing element 7 then, and the distance between the other end of light barrier 11 and the head end face 91 is less than 2 millimeters; Light barrier 11 is positioned at the top of reflectance coating 10; To reflect the other end that post 9 inserts outer tube 6 again, after the insertion, head end face 91 is positioned at the inside of outer tube 6; With the closed at both ends of outer tube 6, can accomplish the manufacturing of reflective some type temperature detected by optical fiber fire detector this moment at last.
Claims (8)
1. reflective some type temperature detected by optical fiber fire detector; Comprise emission optical cable (4), receive optical cable (5) and outer tube (6); One end of said emission optical cable (4) is connected with light source (1) after light modulator (2) modulation, and an end of said reception optical cable (5) is connected with input processor (3), and the other end of emission optical cable (4), reception optical cable (5) all extends in the outer tube (6); And in outer tube (6), be provided with temperature-sensing element (7), it is characterized in that:
The inside at said outer tube (6) two ends has been inserted in ferrule (8) and reflection post (9) respectively; Be inserted with emission optical cable (4), reception optical cable (5) in the optical fiber cavity (83) in the said ferrule (8) with ferrule (8) inner face (81) flush; The outer face (82) of ferrule (8) extends to the outside of outer tube (6); The head end face (91) of said reflection post (9) is oppositely arranged with the inner face (81) of ferrule (8) in outer tube (6); The breech face (92) of reflection post (9) extends to the outside of outer tube (6); Head end face (91) is provided with reflectance coating (10), and the top of reflectance coating (10) is provided with light barrier (11), and the temperature-sensing element (7) that is provided with on an end of light barrier (11) and reflection post (9) side is connected; The other end extends between head end face (91), the inner face (81), and the nearly head end face (91) of temperature-sensing element (7) is provided with;
Said outer tube (6) is the temperature sensitive type sleeve pipe, and said temperature-sensing element (7) is a temperature-sensitive deformation element, and said emission optical cable (4), reception optical cable (5) are with a kind of optical cable.
2. reflective some type temperature detected by optical fiber fire detector according to claim 1; It is characterized in that: said reflection post (9) is provided with and the corresponding skewed slot of temperature-sensing element (7) (12); The high-end caudal part face (92) of skewed slot (12) is provided with; The low side of skewed slot (12) communicates with the bayonet socket (13) that head end face (91) top is offered, and card has light barrier (11) in this bayonet socket (13).
3. reflective some type temperature detected by optical fiber fire detector according to claim 2; It is characterized in that: the breech face (92) of said reflection post (9) is connected with limited post (14), and the end face diameter of limited post (14) is greater than the end face diameter of reflection post (9).
4. reflective some type temperature detected by optical fiber fire detector according to claim 1; It is characterized in that: the outer face (82) of said ferrule (8) is connected with spacing optical fiber tube (15); The set inside of spacing optical fiber tube (15) has No. two optical fiber cavities (151) coaxial with an optical fiber cavity (83), and on the inwall of spacing optical fiber tube (15), is symmetrically arranged with a pair of optical fiber card article (152).
5. according to claim 1,2,3 or 4 described reflective some type temperature detected by optical fiber fire detectors, it is characterized in that: said light source (1) is LASER Light Source or led light source, and said emission optical cable (4), reception optical cable (5) are quartzy optical cable or plastic optical fiber cable.
6. reflective some type temperature detected by optical fiber fire detector according to claim 5 is characterized in that: said light source (1) is the green LED light source, and said emission optical cable (4), reception optical cable (5) are the communication stage plastic optical fiber cable.
7. reflective some type temperature detected by optical fiber fire detector according to claim 6; It is characterized in that: the diameter of said emission optical cable (4), reception optical cable (5) internal optical fiber is 1 millimeter; Distance between said head end face (91), the inner face (81) is 2.5 millimeters of 2 –; One end of said light barrier (11) is connected with temperature-sensing element (7), and the distance between the other end and the head end face (91) is less than 2 millimeters.
8. according to claim 1,2,3 or 4 described reflective some type temperature detected by optical fiber fire detectors, it is characterized in that: the manufactured materials of said outer tube (6) is a metal; The manufactured materials of said light barrier (11) is a metal, and its thickness is smaller or equal to 0.1 millimeter; The manufactured materials of said ferrule (8), reflection post (9) is plastics.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201482351U CN202495128U (en) | 2012-04-10 | 2012-04-10 | Reflection type point pattern optical fiber temperature-sensitive fire detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637338A (en) * | 2012-04-10 | 2012-08-15 | 武汉发博科技有限公司 | Reflecting point-type optical fiber temperature-sensing fire detector and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637338A (en) * | 2012-04-10 | 2012-08-15 | 武汉发博科技有限公司 | Reflecting point-type optical fiber temperature-sensing fire detector and manufacturing method thereof |
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