CN209842823U - Vertical double-light-path smoke-sensing detection labyrinth - Google Patents
Vertical double-light-path smoke-sensing detection labyrinth Download PDFInfo
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- CN209842823U CN209842823U CN201920537054.XU CN201920537054U CN209842823U CN 209842823 U CN209842823 U CN 209842823U CN 201920537054 U CN201920537054 U CN 201920537054U CN 209842823 U CN209842823 U CN 209842823U
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Abstract
The utility model provides a vertical double-light-path smoke detection labyrinth, which comprises a labyrinth measurement cavity, and a first transmitting tube, a second transmitting tube and a receiving tube which are arranged in the labyrinth measurement cavity, wherein an included angle between an optical axis of the first transmitting tube and an optical axis of the receiving tube is an obtuse angle, and the first transmitting tube and the receiving tube form a forward light path; the optical axis of second transmitting tube with the contained angle between the optical axis of receiver tube is the acute angle, the second transmitting tube with the receiver tube constitutes the backward light path. The smoke detection maze has the advantages of scientific design, improvement of response capability to various kinds of smoke, reduction of misinformation and mutual calibration.
Description
Technical Field
The utility model relates to a smoke detector field, specific theory has related to a labyrinth is surveyed to vertical double light path smoke sensing.
Background
Smoke detectors widely used in automatic fire alarm systems include ion smoke detectors and photoelectric smoke detectors. The ion smoke detector has good detection effect on various open fire smoke and can also detect smoldering fire smoke, but because the ion smoke detector is easily influenced by the environment, the false alarm rate is high, and the ion smoke detector contains a low-energy pollution source, the ion smoke detector cannot meet the requirement on green and environment-friendly products, and is basically replaced by a photoelectric smoke detector.
At present, smoke fire detectors sold in the market all adopt a single infrared beam scattering principle, and the detector with the structure has weaker background signal and is easy to manufacture, so the smoke fire detectors are widely adopted, and have higher detection sensitivity on white smoke or gray smoke with larger particle size but have poorer detection sensitivity on black smoke with smaller particle size; specifically, the forward optical path structure with the scattering angle theta larger than 90 degrees has slow response to solid and liquid fire generating black smoke and basically does not respond to open fire generating particles with the particle size smaller than 0.4 mu m, and the backward optical path structure with the scattering angle theta smaller than 90 degrees cannot distinguish non-fire interference factors such as water mist, dust and the like with particle sizes similar to those of smoke particles. In order to improve the sensitivity of the existing smoke detector to black smoke with small particle size, the mode of reducing the alarm threshold is often adopted, but when the smoke interference with light color such as dust, cigarette smoke and the like exists, the detector can generate response output exceeding the alarm threshold due to small smoke concentration, and the phenomenon of false alarm often occurs.
In order to solve the above problems, people are always seeking an ideal technical solution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of prior art to a vertical double-light-path smoke detection maze that design science, improvement are to the response ability of various smog, are reduced the wrong report, are calibrated each other is provided.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a double-light-path smoke-sensing detection labyrinth comprises a labyrinth measuring cavity, and a first transmitting tube, a second transmitting tube and a receiving tube which are arranged in the labyrinth measuring cavity, wherein an included angle between an optical axis of the first transmitting tube and an optical axis of the receiving tube is an obtuse angle, and the first transmitting tube and the receiving tube form a forward light path; the optical axis of second transmitting tube with the contained angle between the optical axis of receiver tube is the acute angle, the second transmitting tube with the receiver tube constitutes the backward light path.
The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model discloses a three-dimensional structural design makes the receiver tube can receive and come from the light to the light path is received again to first transmitting tube to the light of light path to the second transmitting tube for light intensity obtains strengthening, and two received signal add up the ability that has improved the response to smog, need not to transfer down the response threshold value, just also eliminated the wrong report phenomenon that this reason leads to.
Two transmitting tubes form two groups of light paths, and in the final operation and judgment process, the average value of two groups of data can be taken to judge the dust accumulation degree in the maze, the slow change dust accumulation is compensated, and the pollution alarm is sent out after the slow change dust accumulation exceeds the average value.
Under the condition that the data received by the receiving tube is determined, the two transmitting tubes can be mutually calibrated, when one transmitting tube is in fault, the data acquired by the other transmitting tube can be used for quickly acquiring fault information, and the fault emitter can be temporarily replaced to continue working.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the middle vertical dual-light-path smoke-detecting labyrinth of the present invention.
Fig. 2 is a schematic structural view of another embodiment of the middle vertical dual-light-path smoke-detecting labyrinth of the present invention.
Fig. 3 is a schematic structural view of another embodiment of the middle vertical dual-light-path smoke-detecting labyrinth of the present invention.
In the figure: 1. a first emitter tube; 2. a second launch tube; 3. a receiving tube; 4. a labyrinth measurement cavity; 5. a light seat; 6. a visor; 41. a labyrinth base; 42. a labyrinth cover.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments.
As shown in fig. 1, a vertical dual-light path fire smoke detector labyrinth comprises a labyrinth measuring cavity 4, and two transmitting tubes and a receiving tube 3 which are arranged in the labyrinth measuring cavity 4, wherein an included angle between an optical axis of a first transmitting tube 1 and an optical axis of the receiving tube 3 is an obtuse angle, and the product effect is best when the included angle is 120-150 degrees, so that the first transmitting tube 1 and the receiving tube 3 form a forward light path; the included angle between the optical axis of the second transmitting tube 2 and the optical axis of the receiving tube 3 is an acute angle, and the product effect is best when the included angle is 30-60 degrees, so that the second transmitting tube 2 and the receiving tube 3 form a backward light path. The receiving tube 3 receives a group of forward light paths and a group of backward light paths, so that the light intensity is improved, and the response capability to smoke is improved by the accumulation of two receiving signals.
In this embodiment, the installation positions of the first transmitting tube 1, the second transmitting tube 2 and the receiving tube 3 are located on the same circumference in the same plane, and the center of the labyrinth measuring cavity 4 is located above the installation positions of the first transmitting tube 1, the second transmitting tube 2 and the receiving tube 3; the data received by the receiving tube 3 from the two transmitting tubes are determined, the two transmitting tubes can be mutually calibrated, when one transmitting tube is in fault, the data acquired by the other transmitting tube can be used for quickly acquiring fault information, and the fault emitter can be temporarily replaced to continue working.
In other embodiments, as shown in fig. 2, the centers of the first transmitting tube 1, the second transmitting tube 2, the receiving tube 3 and the labyrinth measuring cavity 4 are all located in the same plane. Alternatively, as shown in fig. 3, the optical axes of the first transmitting tube 1, the second transmitting tube 2 and the receiving tube 3 are located on the same plane. In order to reduce the interference phenomenon of non-smoke scattered light, light shielding plates 6 are respectively arranged between the first emission pipe 1 and the receiving pipe 3 and between the second emission pipe 2 and the receiving pipe 3.
The first emission tube 1 emits blue visible light, and the second emission tube 2 emits infrared light; alternatively, the first emission tube 1 emits infrared light, and the second emission tube 2 emits blue visible light. Specifically, the first emission tube 1 and the second emission tube 2 are red and blue light integrated emission tubes, and the receiving tube 3 is a red and blue light integrated receiving tube. The blue visible light is sensitive to open fire response of smoke particles and particles with the particle size smaller than 0.4 mu m in the early stage of a fire disaster, the infrared light is sensitive to grey smoke generated by smoldering of wood and cotton ropes, the sensitivity to white smoke with large particle size and black smoke with small particle size can be considered through the combined design of the blue visible light and the infrared light, the fire hazard can be found very early in the early stage of the fire disaster, and the accuracy and the stability of fire disaster detection are improved.
The labyrinth measuring cavity 4 is enclosed by a labyrinth base 41 and a labyrinth cover 42, a circuit board and an optical seat 5 which is respectively used for installing the first transmitting tube 1, the second transmitting tube 2 and the receiving tube 3 are arranged on the labyrinth base 41; the first transmitting tube 1, the second transmitting tube 2 and the receiving tube 3 are arranged on one side of the circuit board, so that interference of received signals can be reduced.
In order to prevent dust and insects from falling into the labyrinth measuring chamber 4, a protective net is arranged on the labyrinth cover 42, and the mesh size of the protective net is not more than 1 mm.
The first transmitting tube 1 and the second transmitting tube 2 are controlled to be opened and closed by a single control switch; when in use, the medicine can be used separately or together according to different requirements.
In order to meet the requirements of different installation places, lenses are arranged at the front ends of the first transmitting tube 1, the second transmitting tube 2 and the receiving tube 3.
In order to shield external electromagnetic interference, a shielding cover is mounted on the receiving pipe 3.
When the vertical double-light-path smoke-sensing detection maze is used for detection, the vertical double-light-path smoke-sensing detection maze comprises a preparation stage and a detection stage;
preparation phase
After power-up, the following procedure was performed in a smokeless environment for the first 20 seconds:
step 11, only opening the first transmitting tube for 100us to obtain a signal of the receiving tube of Qni;
step 12, closing the first transmitting tube, and only opening the second transmitting tube for 100us, wherein the signal of the receiving tube is Pni;
step 13, multiplexing the data Qni obtained within 20 seconds to obtain the average value Qn0 of the signal of the first transmitting tube when no smoke exists, and similarly obtaining the average signal Pn0 of the signal of the second transmitting tube;
detection phase
After the startup preheating is finished, executing the following processes;
step 21, opening the first transmitting tube, closing the second transmitting tube, detecting a receiving signal Qn on the receiving tube, and delaying for 100 us;
step 22, opening the second transmitting tube, closing the first transmitting tube, detecting a receiving signal Pn on the receiving tube, and delaying for 100 us;
step 23, if the difference value between Qn and Qn0 is greater than the calibrated alarm value QC when leaving factory, and the difference value between Pn value and Pn0 is greater than the set threshold value PN, then fire alarm is carried out, otherwise, the step 25 is carried out;
step 24, if the difference value between Qn and Qn0 is greater than a set threshold QN, and the difference value between Pn and Pn0 is greater than a factory calibration alarm value PC, performing fire alarm, otherwise, turning to step 25;
step 25, delaying 200ms and transferring to a preparation stage.
In order to prevent false alarm, QN is a value greater than QN0 and less than QC, and similarly, PN is a value greater than PN0 and less than PC.
The utility model discloses a vertical two light path smoke detection maze is through the combination of blue visible light and infrared light, compromise the sensitivity to the great white cigarette of particle diameter and the less black cigarette of particle diameter, improve accuracy and stability to fire detection.
When smoke enters a detector labyrinth, when smoke particles are scattered, the receiving tube 3 receives light from a forward light path of the first transmitting tube 1 and light from a backward light path of the second transmitting tube 2, the received light intensity is enhanced, an induction threshold value is not required to be reduced, and false reports of dust and water mist are reduced.
During calibration, two transmitting tubes are respectively and independently started, if the receiving tube 3 cannot receive normal scattered light, the receiving tube 3 breaks down, when the receiving tube 3 can receive the normal value of one transmitting tube and cannot receive the normal value of the other transmitting tube, the other transmitting tube breaks down, and therefore adjustment and maintenance are convenient.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (9)
1. The utility model provides a vertical two light path smoke detection maze which characterized in that: the optical path measuring device comprises a labyrinth measuring cavity, and a first transmitting tube, a second transmitting tube and a receiving tube which are arranged in the labyrinth measuring cavity, wherein an included angle between an optical axis of the first transmitting tube and an optical axis of the receiving tube is an obtuse angle, and the first transmitting tube and the receiving tube form a forward optical path; the optical axis of second transmitting tube with the contained angle between the optical axis of receiver tube is the acute angle, the second transmitting tube with the receiver tube constitutes the backward light path.
2. The vertical dual-light-path smoke-sensing maze of claim 1, wherein: and the included angle between the optical axis of the first transmitting tube and the optical axis of the receiving tube is 120-150 degrees.
3. The vertical dual-light-path smoke-sensing maze of claim 1, wherein: and the included angle between the optical axis of the second transmitting tube and the optical axis of the receiving tube is 30-60 degrees.
4. The vertical dual optical path smoke detection labyrinth as claimed in any one of claims 1 to 3, wherein: light shielding plates are respectively arranged between the first transmitting pipe and the receiving pipe and between the second transmitting pipe and the receiving pipe.
5. The vertical dual-light-path smoke-sensing maze of claim 4, wherein: and the receiving pipe is provided with a shielding cover.
6. The vertical dual optical path smoke detection labyrinth as claimed in any one of claims 1 to 3, wherein: the optical axes of the first transmitting tube, the second transmitting tube and the receiving tube are positioned on the same plane.
7. The vertical dual optical path smoke detection labyrinth as claimed in any one of claims 1 to 3, wherein: the installation positions of the first transmitting tube, the second transmitting tube and the receiving tube are positioned on the same circumference in the same plane.
8. The vertical dual optical path smoke detection labyrinth as claimed in any one of claims 1 to 3, wherein: the first emission tube emits blue visible light, and the second emission tube emits infrared light; alternatively, the first emission tube emits infrared light and the second emission tube emits blue visible light.
9. The vertical dual-light-path smoke-sensing maze of claim 7, wherein: the first transmitting tube and the second transmitting tube are red and blue light integrated transmitting tubes, and the receiving tube is a red and blue light integrated receiving tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920537054.XU CN209842823U (en) | 2019-04-19 | 2019-04-19 | Vertical double-light-path smoke-sensing detection labyrinth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920537054.XU CN209842823U (en) | 2019-04-19 | 2019-04-19 | Vertical double-light-path smoke-sensing detection labyrinth |
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| CN209842823U true CN209842823U (en) | 2019-12-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109979154A (en) * | 2019-04-19 | 2019-07-05 | 汉威科技集团股份有限公司 | Vertical double light path smoke detection labyrinth and its detection method |
| CN113345200A (en) * | 2021-05-10 | 2021-09-03 | 汉威科技集团股份有限公司 | Automatic fire smoke identification and alarm method and device |
-
2019
- 2019-04-19 CN CN201920537054.XU patent/CN209842823U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109979154A (en) * | 2019-04-19 | 2019-07-05 | 汉威科技集团股份有限公司 | Vertical double light path smoke detection labyrinth and its detection method |
| CN113345200A (en) * | 2021-05-10 | 2021-09-03 | 汉威科技集团股份有限公司 | Automatic fire smoke identification and alarm method and device |
| CN113345200B (en) * | 2021-05-10 | 2023-03-14 | 汉威科技集团股份有限公司 | Automatic fire smoke identification and alarm method and device |
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