CN109979155A - A smoke detection maze - Google Patents

Abstract

The present invention provides a smoke detection labyrinth, comprising a labyrinth measurement cavity and two sets of emission tubes and receiver tubes arranged in the labyrinth measurement cavity, wherein the optical axis of the first emission tube is respectively the same as the optical axis of the first reception tube. The included angle between the axis and the optical axis of the second receiving tube is equal and acute, so that the first transmitting tube and the first receiving tube and the second receiving tube respectively form a backward optical path; the optical axis of the second transmitting tube is The included angle between the optical axis of the first receiving tube and the optical axis of the second receiving tube is equal and both are obtuse angles, so that the second transmitting tube and the first receiving tube and the second receiving tube respectively form a forward optical path. The smoke detection maze has the advantages of scientific design, improved response to various smokes, reduced false alarms, and mutual calibration.

Description

A smoke detection maze

technical field

The invention relates to the field of smoke detectors, in particular to a smoke detection maze.

Background technique

There are two types of smoke detectors widely used in automatic fire alarm systems: ion smoke detectors and photoelectric smoke detectors. Ion smoke detectors have better detection effects on various open flames and smoke from smoldering fires. However, because they are easily affected by the environment, have a high false alarm rate, and contain low-energy pollution sources, they cannot meet the requirements of green products. Environmental protection requirements have basically been replaced by photoelectric smoke detectors.

At present, the smoke detectors on the market all use the principle of infrared beam scattering. The smoke detection maze involved has higher sensitivity to white or gray smoke with larger particle size, but is more sensitive to black smoke with smaller particle size. The detection sensitivity is poor. In order to improve the sensitivity of existing smoke detectors to black smoke with small particle size, the method of lowering the alarm threshold is often used. Detectors show a response output exceeding the alarm threshold, often causing false alarms.

The existing smoke detectors are all equipped with a launch tube. When the launch tube is damaged, it is often necessary to dismantle and re-install the shell for calibration, which is time-consuming and labor-intensive.

In order to solve the above problems, people have been looking for an ideal technical solution.

SUMMARY OF THE INVENTION

The purpose of the present invention is to aim at the deficiencies of the prior art, so as to provide a smoke detection labyrinth with scientific design, improved response ability to various smokes, reduced false alarms, and mutual calibration.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a smoke detection maze, comprising a labyrinth measurement cavity and two groups of launch tubes and receiver tubes arranged in the labyrinth measurement cavity, wherein the first launch tube has The optical axis is equal to the angle between the optical axis of the first receiving tube and the optical axis of the second receiving tube, and both are acute angles, so that the first transmitting tube and the first receiving tube and the second receiving tube respectively form a backward optical path The angle between the optical axis of the second launch tube and the optical axis of the first receiving tube and the optical axis of the second receiving tube is equal and both are obtuse angles, so that the second launching tube is respectively connected with the first receiving tube and the second receiving tube. The receiving tube forms the forward light path.

Based on the above, the opening and closing of the first launch tube and the second launch tube are controlled by separate control switches.

Based on the above, lenses are installed on the front ends of the first launch tube, the second launch tube, the first receiver tube and the second receiver tube.

Based on the above, shielding covers are installed on the first receiving pipe and the second receiving pipe.

Based on the above, the installation positions of the first launch tube, the first receiver tube and the second receiver tube are located on the same circumference in the same plane, and the first launch tube, the first receiver tube The connecting line with the installation position of the second receiving pipe forms an isosceles triangle.

Basically, the installation position of the second launch tube is located above the installation positions of the first launch tube, the first receiver tube and the second receiver tube.

Based on the above, the first emission tube emits blue visible light, and the second emission tube emits infrared light; or, the first emission tube emits infrared light, and the second emission tube emits blue visible light.

Compared with the prior art, the present invention has outstanding substantive features and significant progress. Specifically, the present invention adopts a three-dimensional structural design to form two groups of forward optical paths and two groups of backward optical paths, and the first receiving tube is both The forward light path receiving device is also used as a backward light path receiving device, and the second receiving tube is both a forward light path receiving device and a backward light path receiving device, so that the light intensity is enhanced, and the accumulation of the two received signals improves the response to smoke. ability, without lowering the sensing threshold, which eliminates false positives caused by this cause.

The two launch tubes form two sets of optical paths. In the final calculation and judgment process, the average value of the two sets of data can be taken to determine the degree of dust accumulation in the maze, and the slowly changing dust accumulation can be compensated.

When two launch tubes are installed symmetrically, the two launch tubes can be calibrated to each other. When one launch tube fails, the data obtained by the other launch tube can quickly learn the fault information, and can temporarily replace the faulty emitter to continue to work.

Description of drawings

FIG. 1 is a schematic structural diagram of a smoke detection maze in the present invention.

FIG. 2 is a schematic structural diagram of a smoke detection maze in another embodiment.

In the picture: 1. The first launch tube; 2. The second launch tube; 3. The first receiver tube; 4. The second receiver tube.

Detailed ways

The technical solutions of the present invention will be further described in detail below through specific embodiments.

As shown in FIG. 1, a smoke detection maze includes a labyrinth measurement cavity and two sets of transmitting tubes and receiving tubes arranged in the labyrinth measurement cavity, wherein the optical axis of the first transmitting tube 1 is respectively connected with the first receiving tube. The angle between the optical axis of the tube 3 and the optical axis of the second receiving tube 4 is equal and both are acute angles, so that the first transmitting tube 1 and the first receiving tube 3 and the second receiving tube 4 respectively form a backward optical path; The included angles between the optical axes of the two launch tubes 2 and the optical axis of the first receiving tube 3 and the optical axis of the second receiving tube 4 are equal and both are obtuse angles, so that the second launching tube 2 and the first receiving tube 3 are respectively and the second receiving tube 4 to form a forward optical path. The first receiving tube 3 receives a group of forward light paths and a group of backward light paths, and the second receiving tube 4 also receives a group of forward light paths and a group of backward light paths, which improves the light intensity and the accumulation of the two received signals. Improved responsiveness to smoke.

In this embodiment, the installation positions of the first launch tube 1 , the first receiver tube 3 and the second receiver tube 4 are located on the same circumference in the same plane, and the first launch tube 1 , the The connecting line between the installation positions of the first receiver tube 3 and the second receiver tube 4 forms an isosceles triangle, and the installation position of the first launch tube 2 is located at the first launch tube 1 and the first receiver tube. 3 and above the installation position of the second receiver tube 4; the two launch tubes are installed symmetrically and can be calibrated to each other. When a launch tube fails, the fault information can be quickly obtained by using the data obtained by the other launch tube, and it can be temporarily Continue to work in place of the faulty emitter.

In other embodiments, as shown in FIG. 2 , the first launch tube 1 , the second launch tube 2 , the first receiver tube 3 and the second receiver tube 4 are all located in the same plane.

The first emission tube 1 emits blue visible light, the second emission tube 2 emits infrared light, or the first emission tube 1 emits infrared light, and the second emission tube 2 emits blue visible light; Visible light is sensitive to smoke particles and open flames with particle size less than 0.4 μm in the early stage of fire, and infrared light is sensitive to gray and white smoke produced by smoldering wood and cotton rope. The sensitivity of larger white smoke and black smoke with smaller particle size can detect fire hazards very early in the early stage of fire, and improve the accuracy and stability of fire detection.

The first launch tube 1 and the second launch tube 2 are controlled by separate control switches to open and close; when in use, according to different needs, they can be used separately or together.

In order to meet the requirements of different installation sites, lenses are installed on the front ends of the first launch tube 1 , the second launch tube 2 , the first receiver tube 3 and the second receiver tube 4 .

In order to shield external electromagnetic interference, shielding covers are installed on the first receiving tube 3 and the second receiving tube 4 .

working principle:

The combination of blue visible light and infrared light takes into account the sensitivity to white smoke with larger particle size and black smoke with smaller particle size, and improves the accuracy and stability of fire detection.

When smoke enters the detector maze, the blue visible light (infrared light) emitted by the first emission tube 1 and the infrared light (blue visible light) emitted by the second emission tube 2 will be scattered when encountering smoke particles, and the first receiving tube 3 Receive the light from the backward light path of the first launch tube 1 and the light of the forward light path of the second launch tube 2, and the second receiver tube 4 receives the light from the backward light path of the first launch tube 1 and the forward light of the second launch tube 2. The light of the optical path, the received light intensity is strengthened, it is not necessary to lower the sensing threshold, and the false alarm of dust and water mist is reduced.

When calibrating, enable two transmitting tubes separately. If one of the receiving tubes cannot receive normal scattered light, the receiving tube is faulty. When the two receiving tubes can receive the normal value of one of the transmitting tubes, it cannot receive the other. When one launch tube is at the normal value, the other launch tube is faulty, thereby facilitating adjustment and maintenance.

Finally it should be noted that: the above embodiment is only used to illustrate the technical scheme of the present invention and not to limit it; Although the present invention has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should understand: The specific embodiments of the invention are modified or some technical features are equivalently replaced; without departing from the spirit of the technical solutions of the present invention, all of them should be included in the scope of the technical solutions claimed in the present invention.

Claims (7)

1. A smoke detection labyrinth, characterized in that: comprising a labyrinth measurement cavity and two groups of launch tubes and receiver tubes arranged in the labyrinth measurement cavity, wherein the optical axis of the first launch tube and the first receiver tube are respectively The angle between the optical axis of the second receiving tube and the optical axis of the second receiving tube is equal and acute, so that the first transmitting tube and the first receiving tube and the second receiving tube respectively form a backward optical path; the optical axis of the second transmitting tube The included angles between the optical axis of the first receiving tube and the optical axis of the second receiving tube are equal and both are obtuse angles, so that the second transmitting tube and the first receiving tube and the second receiving tube respectively form a forward optical path. 2 . The smoke detection maze according to claim 1 , wherein the opening and closing of the first launch tube and the second launch tube are controlled by separate control switches. 3 . 3. The smoke detection maze according to claim 1 or 2, wherein the front ends of the first launch tube, the second launch tube, the first receiver tube and the second receiver tube are all Install the lens. 4 . The smoke detection labyrinth according to claim 3 , wherein shielding covers are installed on the first receiving pipe and the second receiving pipe. 5 . 5. The smoke detection maze according to any one of claims 1, 2 or 4, wherein the installation positions of the first transmitting tube, the first receiving tube and the second receiving tube are located at the same location On the same circumference in the plane, the connecting line between the installation positions of the first transmitting tube, the first receiving tube and the second receiving tube forms an isosceles triangle. 6 . The smoke detection labyrinth according to claim 5 , wherein the installation position of the second launch tube is located at the installation position of the first launch tube, the first receiving tube and the second receiving tube. 7 . above the location. 7. The smoke detection maze according to any one of claims 1, 2, 4 or 6, wherein: the first emission tube emits blue visible light, and the second emission tube emits infrared light; or, The first emission tube emits infrared light, and the second emission tube emits blue visible light.