CN203773677U - Optical receiving device for fire smoke alarms - Google Patents
Optical receiving device for fire smoke alarms Download PDFInfo
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- CN203773677U CN203773677U CN201420186069.3U CN201420186069U CN203773677U CN 203773677 U CN203773677 U CN 203773677U CN 201420186069 U CN201420186069 U CN 201420186069U CN 203773677 U CN203773677 U CN 203773677U
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- circular tube
- smoke
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- receiving device
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- Fire-Detection Mechanisms (AREA)
Abstract
The utility model provides an optical receiving device for fire smoke alarms, comprising three parts: a base, a semicircular tube and a reflective layer. The bottom of the base is connected with the cross section of the semicircular tube, and the bottom of the base is provided with a through hole communicated with the inner diameter of the semicircular tube. The semicircular tube is formed by cutting open a complete circular tube from a section passing through the center of the top cross section. If the circular tube is horizontally placed, the horizontal projection is a rectangle, the lower vertex of the left edge line and the central point of the right edge line of the rectangle are connected into a line, and a plane passing through the line and vertical to the horizontal plane is the profile. First, the inner wall surface of the semicircular tube is polished, and when the inner wall surface of the semicircular tube is smooth, reflective material is electroplated to form a high-reflectivity reflective layer. The optical receiving device of the utility model is simple in structure and clear in principle, can be easily mounted on the existing fire smoke alarm, and can significantly improve the sensitivity of smoke detectors and reduce the rate of false alarm.
Description
Technical field
The utility model relates to fire detection technology field, is specifically related to a kind of fire hazard aerosol fog alarm optical receiver assembly.
Background technology
The commitment occurring at fire, in overwhelming majority situation, all can produce a certain amount of smog, naked light produces the black smoke that rough burning particle forms, smoldering fire produces the droplet grey smog that Combustible Materials forms, no matter black smoke or grey cigarette, all can produce and absorb or scattering process irradiating light thereon, according to seeing through the light intensity of fume path or according to the light intensity of smog scattering, can judge the size of smokescope, with this, judge that whether fire occurs.The fire hazard aerosol fog alarm being developed into according to this principle has been widely used in the fire early detection of various scenes.
At present the scatter-type smoke alarm of fire hazard aerosol fog alarm main Types for making based on smoke particle and incident light generation scattering principle, comprises forward scatter-type, back scattering type and multi-pass scatter-type smoke alarm.The subject matter existing is that insufficient sensitivity is high, has certain rate of failing to report; And be easily subject to the interference of the non-fire particles such as dust, occur the phenomenon of wrong report.The reason of failing to report occurs to report by mistake alarm has a lot, and as unreasonable in smoke-box structural design, wall does not have fold processing etc., can cause dust in smoke-box inside deposition, the inner black wall of smoke-box is gradually become to grey, and then increase the interference of internal face reflected light to detector, cause wrong report; Infrared receiving diode receives limited from the angle of smoke particle scattered light, and induction sensitivity is not high.
Utility model content
The utility model is in order to overcome the defect of prior art, and the utility model provides a kind of optical receiver assembly, is applied to scatter-type smoke alarm, can significantly improve the sensitivity of fire-alarm, and greatly reduces the interference of non-fire particle.
A kind of fire hazard aerosol fog alarm optical receiver assembly of the present utility model, comprises base, semi-circular tube and reflector layer three parts; Base bottom is connected with semi-circular tube xsect, and base bottom has perforation and semi-circular tube internal diameter to communicate; Semi-circular tube is that a complete pipe is cut open and formed from the cross section through top cross-section center, pipe horizontal cross is placed, horizontal projection is rectangle, and from rectangle left side bearing, summit connects into a linely to right side bearing central point, crosses this line face vertical with surface level and is section; Semi-circular tube internal face arranges reflector layer.
Wherein, semi-circular tube internal face first carries out after polishing, then electroplates reflectorized material, forms the high reflector layer of reflectivity.
Wherein, the device of the receiving scattered light in smoke alarm, as photoelectric receiving diode, silicon photocell etc., is placed in base, and photosurface is over against base bottom, and photosurface is over against base bottom through-hole; Base size will be coincide with the profile of photoelectric receiving device, and base bottom through-hole internal diameter is identical with semi-circular tube internal diameter, and hole size is consistent with photoelectric receiving device photosurface.
Wherein, it is inner that this device is positioned over smoke alarm smoke-box, and in smoke-box, the most concentrated position of smoke particle is positioned near section and semi-circular tube top xsect intersecting lens.
The utility model has the advantage of:
With smoke alarm receiving unit comparison in the past, the utility model, by the reflex of semi-circular tube internal face reflector layer to smoke particle scattered light, is irradiated to the light of reflection the photosurface of photoelectric receiving device by base bottom through-hole; And if there is no semi-circular tube reflector layer of the present utility model, the angled restriction of light tool that the photosurface of photoelectric receiving device receives, those scattered lights that are radiated at semi-circular tube internal face reflector layer can not be received by photosurface; Therefore the utility model can significantly improve the receiving efficiency of smoke particle scattered light, improves the sensitivity of smoke alarm, reduces rate of failing to report;
Smoke alarm is in the past along with the growth of service time, dust is in smoke-box inside deposition, the smoke-box internal face of script black is gradually become to grey, increase the reflectivity of smoke-box internal face, the light that smoke alarm sends is scattered on being irradiated to smoke particle, also have part by smoke-box internal face multiple reflections, the light intensity of internal face reflection increases gradually, the light of smoke particle scattering is disturbed and strengthened, increase the rate of false alarm of smoke alarm; Semi-circular tube structure of the present utility model, can effectively shield the reflection interference light from semi-circular tube back side smoke-box internal face, coordinate smoke-box in inside by reasonably " guiding wall " structure is set, fire hazard aerosol fog is all guided to semi-circular tube internal face the place ahead, semi-circular tube structure of the present utility model can not have influence on smoke particle scattered light and enter photoelectric receiving device, but can shield most smoke-box internal face reflection interference light, thereby the anti-dust interference performance that greatly strengthens smoke alarm, effectively reduces rate of false alarm.
Accompanying drawing explanation
Fig. 1 is bottom view of the present utility model;
Fig. 2 is top view of the present utility model;
Fig. 3 is lateral plan of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, further illustrate the utility model.
Embodiment 1:
This exemplary application is on the high sensitivity laser smoke sensing detector of China Science & Technology University's SKLFS research and development, and optical receiving device is silicon photocell, although silicon photocell photosensitive area is larger, acceptance angle is less than normal.
Device of the present utility model mainly comprises base 1, semi-circular tube 3 and reflector layer 4 three parts; Base bottom is connected with semi-circular tube xsect, and base bottom has perforation 2 and semi-circular tube internal diameter to communicate; Semi-circular tube is that a complete pipe is cut open and formed from the cross section through top cross-section center, pipe horizontal cross is placed, horizontal projection is rectangle, and from rectangle left side bearing, summit connects into a linely to right side bearing central point, crosses this line face vertical with surface level and is section; Semi-circular tube internal face is reflector layer; Semi-circular tube internal face first carries out polishing, after smoother, then electroplates reflectorized material, forms the high reflector layer of reflectivity;
Silicon photocell profile in this example is that the wide * 1mm of the long * 8mm of 10mm is high, and base size of the present utility model and silicon photocell profile are coincide, and silicon photocell is placed in base, and photosurface is over against the through hole of base bottom; Through-hole diameter is 6mm; Semi-circular tube external diameter is 7mm, and internal diameter is 6mm, and length is 30mm; By the meticulous polishing of semi-circular tube internal face, then plate one deck reflector layer, in this example, chromium plating is processed.
The device of the receiving scattered light in smoke alarm, as photoelectric receiving diode, silicon photocell etc., is placed in base, and photosurface is over against base bottom, and photosurface is over against base bottom through-hole; Base size will be coincide with the profile of photoelectric receiving device, and base bottom through-hole internal diameter is identical with semi-circular tube internal diameter, and hole size is consistent with photoelectric receiving device photosurface; It is inner that device of the present utility model is positioned over smoke alarm smoke-box, and in smoke-box, the most concentrated position of smoke particle is positioned near section and semi-circular tube top xsect intersecting lens.
With smoke alarm receiving unit comparison in the past, the utility model, by the reflex of semi-circular tube internal face reflector layer to smoke particle scattered light, is irradiated to the light of reflection the photosurface of photoelectric receiving device by base bottom through-hole; And if there is no semi-circular tube reflector layer of the present utility model, the angled restriction of light tool that the photosurface of photoelectric receiving device receives, those scattered lights that are radiated at semi-circular tube internal face reflector layer can not be received by photosurface; Therefore the utility model can significantly improve the receiving efficiency of smoke particle scattered light, improves the sensitivity of smoke alarm, reduces rate of failing to report;
Smoke alarm is in the past along with the growth of service time, dust is in smoke-box inside deposition, the smoke-box internal face of script black is gradually become to grey, increase the reflectivity of smoke-box internal face, the light that smoke alarm sends is scattered on being irradiated to smoke particle, also have part by smoke-box internal face multiple reflections, the light intensity of internal face reflection increases gradually, the light of smoke particle scattering is disturbed and strengthened, increase the rate of false alarm of smoke alarm; Semi-circular tube structure of the present utility model, can effectively shield the reflection interference light from semi-circular tube back side smoke-box internal face, coordinate smoke-box in inside by reasonably " guiding wall " structure is set, fire hazard aerosol fog is all guided to semi-circular tube internal face the place ahead, semi-circular tube structure of the present utility model can not have influence on smoke particle scattered light and enter photoelectric receiving device, but can shield most smoke-box internal face reflection interference light, thereby the anti-dust interference performance that greatly strengthens smoke alarm, effectively reduces rate of false alarm.
Through testing in the standard combustion room that meets national standard < < GB4715-2005 point type fire hazard aerosol fog alarm > >, four kinds of standard fire results of combustion tests show, are loaded with the smoke alarm of the utility model device than not having smoke alarm (other conditions the are all identical) sensitivity of the utility model device to improve 23%.Because dust deposit experiment is not easy checking, at alarm, with the incandescent light changing, simulate the interference of veiling glare around herein, the position of incandescent light modulation is positioned at the back side of semi-circular tube, approximate simulation is disturbed from the reflected light of wall, experimental result shows, add alarm of the present utility model interference reduction about 50%.Optical receiver assembly of the present utility model, simple structure, principle is clear, is easily mounted on existing fire hazard aerosol fog alarm, and can significantly improves the sensitivity of smoke detector and reduce rate of false alarm.
Claims (5)
1. a fire hazard aerosol fog alarm optical receiver assembly, is characterized in that, comprises base (1), semi-circular tube (3) and reflector layer (4) three parts; Base (1) bottom is connected with semi-circular tube (3) xsect, and base (1) bottom has perforation (2) and semi-circular tube (3) internal diameter to communicate; Semi-circular tube (3) is that a complete pipe is cut open and formed from the cross section through top cross-section center, pipe horizontal cross is placed, horizontal projection is rectangle, and from rectangle left side bearing, summit connects into a linely to right side bearing central point, crosses this line face vertical with surface level and is section; Semi-circular tube (3) internal face arranges reflector layer (4).
2. a kind of fire hazard aerosol fog alarm optical receiver assembly according to claim 1, is characterized in that, semi-circular tube (3) internal face first carries out after polishing, then electroplates reflectorized material, forms the high reflector layer (4) of reflectivity.
3. a kind of fire hazard aerosol fog alarm optical receiver assembly according to claim 1, it is characterized in that the photoelectric receiving device of the receiving scattered light in smoke alarm is placed in base (1), photosurface is over against base (1) bottom, and photosurface is over against base (1) bottom through-hole; Base (1) size will be coincide with the profile of photoelectric receiving device, and base (1) bottom through-hole internal diameter is identical with semi-circular tube (3) internal diameter, and hole size is consistent with photoelectric receiving device photosurface.
4. a kind of fire hazard aerosol fog alarm optical receiver assembly according to claim 3, is characterized in that, the photoelectric receiving device of described receiving scattered light is photoelectric receiving diode or silicon photocell.
5. a kind of fire hazard aerosol fog alarm optical receiver assembly according to claim 1, it is characterized in that, it is inner that described optical receiver assembly is positioned over smoke alarm smoke-box, and in smoke-box, the most concentrated position of smoke particle is positioned near section and semi-circular tube top xsect intersecting lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420186069.3U CN203773677U (en) | 2014-04-16 | 2014-04-16 | Optical receiving device for fire smoke alarms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420186069.3U CN203773677U (en) | 2014-04-16 | 2014-04-16 | Optical receiving device for fire smoke alarms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203773677U true CN203773677U (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420186069.3U Expired - Fee Related CN203773677U (en) | 2014-04-16 | 2014-04-16 | Optical receiving device for fire smoke alarms |
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| CN (1) | CN203773677U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956021A (en) * | 2014-04-16 | 2014-07-30 | 中国科学技术大学 | Optical receiving device of fire smoke alarm |
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2014
- 2014-04-16 CN CN201420186069.3U patent/CN203773677U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956021A (en) * | 2014-04-16 | 2014-07-30 | 中国科学技术大学 | Optical receiving device of fire smoke alarm |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20200416 |