CN111080960A - Smoke detection device with light guide scattering structure - Google Patents
Smoke detection device with light guide scattering structure Download PDFInfo
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- CN111080960A CN111080960A CN202010067274.8A CN202010067274A CN111080960A CN 111080960 A CN111080960 A CN 111080960A CN 202010067274 A CN202010067274 A CN 202010067274A CN 111080960 A CN111080960 A CN 111080960A
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- Prior art keywords
- light
- smoke detection
- labyrinth
- detection device
- scattering structure
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
Abstract
The invention discloses a smoke detection device with a light guide scattering structure, which comprises a labyrinth body and a labyrinth cover provided with a labyrinth part; the light-emitting device is characterized in that an induction chip is arranged in the labyrinth body, a light-emitting device is arranged on the side edge, a reflecting area of a parabolic reflecting surface is further arranged on the labyrinth part, a light barrier is further vertically arranged on one side of the light-emitting device, and a hollow area is formed for light to pass through. This patent is through setting up reflecting region and barn door, and its light detection return circuit lengthens, is equivalent to the nearly twice light path of extension to through the barn door guide and shelter from the transmission of light, avoid direct scattering to get into the smog detection room, cause the light to disturb. And the induction chip and the light-emitting device are directly arranged on the circuit board, so that the production, installation and post-maintenance are more convenient, and the practicability is high.
Description
Technical Field
The invention relates to the technical field of fire fighting equipment, in particular to a smoke detection device with a light guide scattering structure.
Background
The traditional smoke detector, smoke alarm or smoke sensor and the like are realized by adopting an ionization type alarm principle, and have the defects that the detection speed is relatively slow, the response speed of detection alarm is very important in the smoke diffusion process, and the loss degree can be reduced due to timely alarm response.
The photoelectric smoke detection principle is adopted for realizing the photoelectric smoke detection, and compared with an ionization mode, the photoelectric smoke detection method has the advantage that the response speed is much higher. The smoke detector is generally provided with a smoke detection chamber, various special labyrinth structures are usually arranged in the smoke detector, and smoke dust is intelligently analyzed and sensed when entering the smoke detection chamber. However, in the prior art, when the photoelectric principle is adopted for detection, the common various photoelectric smoke detectors have the following disadvantages:
(1) the arrangement of the positions of the luminous source component and the light receiving component is relatively random, the whole loop for detecting light is not specially and beneficially designed, generally, the distance between the luminous source component and the light receiving component is the distance, when smoke dust enters the smoke detection chamber, the light is shielded by the smoke dust, so that the change of photocurrent is caused, and the amplitude of the change of photocurrent is completely limited by the local condition of the distance between the luminous source component and the light receiving component;
(2) because the smoke detection chamber is of an open structure, although the outer periphery of the smoke detection chamber is provided with a structure similar to a maze, part of ambient light can penetrate into the smoke detection chamber, and the light of the luminous source part is interfered, so that the smoke detection result deviation is caused;
(3) the light emitted by the light emitting source component can be reflected and refracted by light rays of all structural components in the smoke detection chamber and reflected by light rays of a reflector arranged inside the smoke detection chamber to form cross reflection, refraction or scattering, after smoke dust enters, the light rays are scattered due to the shielding effect of the smoke dust, and part of the penetrating light rays are combined with dynamically-changed environment light, so that the light rays for smoke detection are mutually influenced and interfered, the background noise is large, and even in different space environments or different time periods, the light rays received by the light receiving component are unstable, and the analyzed smoke detection result is unreliable, so that the possibility of false alarm and false alarm exists;
(4) various structures and smoke detection modes in the prior art can also generate false alarm due to long-time dust accumulation; when an abnormal scene such as steam exists, false alarm is easily generated because the type of smoke or the size of smoke particles cannot be effectively distinguished.
In practical application, various analysis errors can generate false reports or false reports, the false reports can have serious consequences, the false reports can interfere with daily use, and the false reports are one of important reasons for removal of use.
In chinese patent No. 03814269.4, a scattered light alarm is disclosed, which comprises an optical measuring chamber comprising a sensing device with at least one light source and a light receiver and a labyrinth-like isolation assembly with spacers arranged on the circumference of the measuring chamber. This patent is a relatively large distance formed between optical surfaces of the light source and/or the light receiver through which light passes, and the distance is larger than the diameter of the optical surfaces or the lenses. The patent does not effectively guide the light transmission path or extend the light transmission distance, and has a limited sensitivity in detecting light scattering.
Disclosure of Invention
The invention is to provide a smoke detection device with a light guide scattering structure, wherein a light emitting part is arranged at a specific position, a specific light guide pipe is arranged to guide a light path, and a process shading effect is achieved to avoid light scattering, so that light background noise is reduced, the accuracy and reliability of smoke detection are improved, and the probability of false alarm or missed alarm is reduced.
In order to solve the technical problem, one technical scheme of the invention is as follows:
a smoke detection device with a light guide scattering structure comprises a labyrinth body and a labyrinth cover, wherein a hollow smoke detection chamber is arranged in the middle of the labyrinth body and the labyrinth cover after the labyrinth body and the labyrinth cover are assembled and installed; the labyrinth cover includes a labyrinth member for directing smoke into the smoke detection chamber;
the bottom of the smoke detection chamber is positioned in the labyrinth cover, and is provided with a notch for arranging an induction chip with light emission and light reception;
the method is characterized in that: the top area of the smoke detection chamber is provided with a reversed-bucket-shaped shell which forms a component of the labyrinth part, and the labyrinth part is provided with a reflection area for reflecting light and is positioned at the extending position of one side edge of the reversed-bucket-shaped shell;
at least one luminous source is arranged right below the reflecting region;
and a light barrier is vertically arranged in an area which is below the reflecting area and is deviated to the central direction of the smoke detection chamber for a certain distance.
Further, the reflecting area is a parabolic reflecting surface.
Furthermore, a distance space is arranged between the reflecting area and the light barrier.
Further, the bottom side of the smoke detection chamber is provided with a light guide hole.
Furthermore, the light barrier is arranged in an arc shape and is arranged at 100-130 degrees.
Preferably, the light emitting source is an LED lamp.
Furthermore, various light emitting diodes and photoelectric diodes are integrated in the induction chip.
Further, the sensing chip selects an optical detection module with the model number of ADPD188 BI.
Further, the labyrinth part is also provided with a guide plate.
Further, a horn is arranged in the middle area of the top of the labyrinth cover.
Compared with the prior art, the invention has the following beneficial effects:
(1) the light barrier is arranged above the light emitting device, the light path is guided by the light barrier, the light rays are prevented from being reflected midway and entering the sensing chip, the light barrier can also shield residual light scattering, the situation that the light rays directly enter the smoke detection chamber to generate various light rays for reflection and refraction to form background noise is avoided, and the detection accuracy can be effectively improved;
(2) the induction chip including the light receiving device is arranged at the center of the bottom of the labyrinth structure, the other light emitting device is arranged at the periphery of the bottom, and the key chip or device is directly arranged on the circuit board and is directly connected with the hole during production and installation;
(3) the reflecting area with the parabolic reflecting surface is arranged in the labyrinth part, and the light blocking plate is arranged in a hollow area, so that light rays coming out of the light guide hole are directly reflected to the light receiving part on the induction chip.
In order to simplify the production steps, a layer of white light-reflecting material can be directly coated at the position of the reflecting area, and the light-emitting device can adapt to different light-reflecting setting modes by adjusting the light-emitting intensity of the light-emitting device, so that the complexity of the production process can be greatly reduced;
(4) by arranging the reflecting region and the light barrier, the light detection loop is lengthened, namely the light path is lengthened by nearly two times, the distance between the light emitting device and the light receiving device in the traditional technology is exceeded, the signal-to-noise ratio can be improved, and the accuracy of the detection result is improved;
(5) the light-emitting device is directly welded on the circuit board and hidden in the light guide hole on the labyrinth body, certain heat dissipation conditions are provided, the temperature response is relatively slow, the temperature shock can be avoided, and a better temperature system can be obtained.
Drawings
Fig. 1 is a schematic structural anatomy diagram of a smoke detection device with a light guide scattering structure according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of a labyrinth body of the smoke detection device with a light guide scattering structure and a partially enlarged view of a light barrier portion according to the embodiment of the present invention.
Fig. 3 is a schematic view of another perspective structure of the labyrinth of the smoke detection device with the light guide scattering structure according to the embodiment of the present invention.
Fig. 4 is an exploded schematic view of a three-dimensional structure of a labyrinth of a smoke detection device with a light guide scattering structure according to an embodiment of the present invention.
Fig. 5 is a schematic perspective view of a labyrinth component of the smoke detection device with a light guide scattering structure according to the embodiment of the invention and a partially enlarged view of a reflection area.
Fig. 6 is a schematic view of another perspective structure of the labyrinth component of the smoke detection device with a light guide scattering structure according to the embodiment of the present invention.
In fig. 1: 20-labyrinth cover, 201-labyrinth part, 103-inverted bucket-shaped shell, 101-reflection area, 102-light barrier, 10-labyrinth body, 30-smoke detection chamber, 302-light guide hole, 301-induction chip, 303-LED lamp.
In fig. 2: 10-labyrinth body, 102-light barrier, 301-induction chip.
In fig. 3: 10-maze body.
In fig. 4: 201-labyrinth part, 202-loudspeaker, 102-light barrier, 10-labyrinth body, 50-circuit board, 301-induction chip, 303-LED lamp.
In fig. 5: 101-reflection area, 201-labyrinth part, 2011-guide plate, 2012-key light guide groove and 2013-horn line hole.
In fig. 6: 201-labyrinth component.
Detailed Description
The drawings that accompany the detailed description can be briefly described as follows, and it is apparent that the described embodiments are a part of the embodiments of the present invention, and the drawings are some of the embodiments of the present invention, and other forms of drawings can be obtained by those skilled in the art without inventive effort.
It is to be understood that, unless otherwise expressly specified or limited, the terms "connected," "coupled," and "mounted" in the description of the invention are to be construed broadly, and may, for example, be integrally connected, fixedly connected, or detachably connected; either directly, mechanically or electronically, or indirectly through intervening media.
In the description of the present invention, "a plurality" or "a plurality" means two or more, and "at least one" is preferably one, and may be more, unless otherwise explicitly defined in the present embodiment.
The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following disclosure provides different embodiments or examples for implementing different structures or different implementation methods of the present invention. The components and arrangements of the specific embodiments are described below to simplify the present disclosure.
As shown in fig. 1, a smoke detection device with a light guide scattering structure includes a labyrinth body 10 and a labyrinth cover 20, wherein a hollow smoke detection chamber 30 is arranged in the middle of the labyrinth body 10 and the labyrinth cover 20 after being assembled; the labyrinth cover 20 includes a labyrinth member 201 for guiding smoke into the smoke detection chamber 30; the bottom of the smoke detection chamber 30 is located in the labyrinth cover 20, and is provided with a notch for arranging a sensing chip 301 with light emission and light reception, and the sensing chip 301 is arranged on the central axis of the labyrinth cover 20.
The inverted bucket housing 103 provided in the labyrinth cover 20 is an integral part of the labyrinth 201 and is disposed in the top region of the smoke detection chamber 30.
The side edge of the bottom of the smoke detection chamber 30 is provided with a light guide hole 302, an LED lamp 303 is arranged below the light guide hole 302, and the LED lamp 303 is a light emitting source for emitting light, preferably a high-brightness light emitting diode.
As shown in fig. 4 and 5, a reflection area 101 is provided on the labyrinth 201, and is located at an extending position of one side of the inverted bucket-shaped housing 103; in the lower area of said reflective area 101, there is also arranged a light barrier 102.
In this embodiment, the external smoke enters the smoke detection chamber 30 through the labyrinth 201, and since the smoke detection device is generally installed upside down, the labyrinth cover 20 is located below and the sensing chip 301 is located above, and the smoke is generally concentrated on the region from the periphery of the inverted-bucket-shaped housing 103 to the sensing chip 301. When smoke is detected in a photoelectric manner, the smoke affects light to generate scattering, and the intensity of the light acquired by the sensing chip 301 is accordingly affected and attenuated.
As shown in fig. 1, 2 and 5, the reflective region 101 is a parabolic reflective surface.
As one of the possible implementation manners, the reflective region 101 may also be a slope or other structures capable of reflecting light.
The reflecting region 101 is spaced apart from the light barrier 102 by a distance.
In this embodiment, the light barrier 102 does not protrude to the top of the smoke detection chamber 30, and a space region is left in the middle of the light barrier for reflecting light, when the light reaches the reflection region 101, under the action of the parabolic reflection surface of the reflection region 101, a part of the light is reflected, passes through the empty space region, and is directly reflected onto the sensing chip 301, so as to sense the change of the intensity of the feedback light.
Preferably, the light barrier 102 is arranged in a circular arc shape, and is arranged at 100-130 degrees, preferably 120 degrees.
In this embodiment, the lower end of the light barrier 102 is extended and connected to the light guide hole 302, so as to block the light emitted from the light guide hole 302 from entering the smoke detection chamber 30 by 120 degrees. The light emitted from the light guide hole 302 is mostly directly emitted onto the parabolic reflecting surface of the reflecting area 101 under the guidance of the light barrier 102.
Preferably, the LED lamp 303 is a patch LED lamp. As shown in fig. 4, in this embodiment, the patch LED lamp is directly soldered on the circuit board 50, and only needs to be placed right against the light guide hole 302 during installation, which is very convenient for mass production, and is different from the conventional way that the light emitting source is not directly disposed on the circuit board, so that the convenience of production and maintenance can be greatly improved, and the practicability is very strong.
The sensing chip 301 is integrated with a plurality of light emitting diodes and photodiodes. Preferably, the sensing chip 301 selects an optical detection module with model number ADPD188 BI.
As shown in fig. 5, the labyrinth 201 is further provided with a baffle 2011. In this embodiment, a plurality of the guide plates 2011 arranged vertically are sequentially arranged on the labyrinth 201, a gap is left between adjacent guide plates 2011, and external smoke enters the smoke detection chamber 30 in the middle along the gap and under the guiding action of the guide plates 2011.
In the present embodiment, a horn 202 is disposed at the top middle region of the labyrinth cover 20. Referring to fig. 4 and 5, the horn 202 is nested on the labyrinth 201, and the lead-in of the horn 202 is inserted from the horn wire hole 2013 for connecting with the circuit board 50. Still arranged button leaded light groove 2012 on labyrinth part 201 for place transparent button leaded light post, work as when smoke detector reports to the police, with the pilot lamp that button leaded light post afterbody links to each other is luminous and printing opacity arrives button leaded light post for audio-visual warning suggestion. The tail end of the key light guide column is further connected with a key, and the key can be triggered by pressing the key light guide column.
The working principle of the invention is as follows: the sensing chip 301 is integrated with a light emitting device and a light receiving device, and controls the light emitting device to emit light, and the light receiving device receives part of the light after the light is reflected or scattered by smoke or a related structure, so that the magnitude of photocurrent or optical power can be obtained, and the change of the magnitude of the photocurrent or optical power can be detected to detect whether smoke exists in the current smoke detection chamber 30 or to judge the type of the smoke.
The LED lamp 303 disposed in the light guide hole 302 is also a light emitting device. The LED lamp 303 faces the reflection area 101 on the labyrinth component 201, when the LED lamp 303 is controlled to emit light, the light is not directly scattered into the smoke detection chamber 30 due to the guiding and shielding of the light barrier 102, but is directly emitted onto the parabolic reflection surface of the reflection area 101, after being reflected, the reflected light passes through the empty area of the light barrier 102 and is emitted onto the sensing chip 301, and then is analyzed and judged by the light receiving device on the sensing chip 301. Compared with the prior art, the distance of the light in the flowing process is increased, and the light is not directly scattered in the smoke detection chamber, so that light interference is avoided.
According to the smoke detection device with the light guide scattering structure, the induction chip including the light receiving device is arranged at the center of the bottom of the labyrinth structure, the other light emitting device is arranged at the peripheral position of the bottom, the key chip or device is directly arranged on the circuit board, and the light emitting device is directly connected with the hole during production and installation.
According to the smoke detection device with the light guide scattering structure, the light barrier is arranged above the light emitting device, the light path is guided by the light barrier, and the scattering of residual light is shielded, so that the background noise caused by the reflection and refraction of various light rays directly entering a smoke detection chamber is avoided, and the detection accuracy can be effectively improved.
According to the smoke detection device with the light guide scattering structure, the reflecting area with the parabolic reflecting surface is arranged in the labyrinth part, and the light from the light guide hole is directly reflected to the light receiving part on the induction chip by combining the light blocking plate hollow area.
The smoke detection device with the light guide scattering structure can simplify production steps, only a layer of white light reflecting material is directly coated at the position of the reflecting area, and the smoke detection device can adapt to different light reflecting setting modes by adjusting the luminous intensity of the light emitting device, so that the complexity of the production process can be greatly reduced.
According to the smoke detection device with the light guide scattering structure, the reflecting area and the light barrier are arranged, the light detection loop is lengthened, namely the light path is lengthened by nearly two times, the distance between the light emitting device and the light receiving device in the traditional technology is exceeded, the signal-to-noise ratio can be improved, and the accuracy of the detection result is improved.
According to the smoke detection device with the light guide scattering structure, the light emitting device is directly welded on the circuit board and is hidden in the light guide hole in the labyrinth body, certain heat dissipation conditions are provided, the temperature response is relatively slow, sudden temperature change can be avoided, and a better temperature system can be obtained.
The above description is only for the purpose of illustrating the present invention and the technical idea and features thereof, and is intended to enable persons skilled in the art to understand the present invention and implement the present invention accordingly, but not to limit the scope of the present invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (10)
1. A smoke detection device with a light guide scattering structure comprises a labyrinth body (10) and a labyrinth cover (20), wherein a hollow smoke detection chamber (30) is arranged in the middle of the labyrinth body (10) and the labyrinth cover (20) after the labyrinth body (10) and the labyrinth cover (20) are assembled; the labyrinth cover (20) comprises a labyrinth part (201) for guiding smoke into the smoke detection chamber (30);
the bottom of the smoke detection chamber (30) is positioned in the labyrinth cover (20) and is provided with a gap for arranging a sensing chip (301) with light emission and light reception;
the method is characterized in that:
the top area of the smoke detection chamber (30) is provided with a hopper-shaped shell (103) which forms a component of the labyrinth part (201), and the labyrinth part (201) is provided with a reflection area (101) for reflecting light rays and is positioned at the extending position of one side edge of the hopper-shaped shell (103);
at least one luminous source is arranged right below the reflecting area (101);
and a light barrier (102) is also vertically arranged in a region which is arranged below the reflecting area (101) and is deviated to the central direction of the smoke detection chamber (30) for a certain distance.
2. A smoke detection device with a light guiding and scattering structure according to claim 1, wherein said reflecting area (101) is a parabolic reflecting surface.
3. A smoke detection device with a light guiding and scattering structure according to claim 1, wherein said reflecting area (101) is spaced apart from said light barrier (102) by a distance.
4. A smoke detection device with a light guiding and scattering structure according to claim 1, wherein the bottom side of said smoke detection chamber (30) is provided with a light guiding hole (302).
5. The smoke detection device with the light guide scattering structure is characterized in that the light barrier (102) is arranged in a circular arc shape and is arranged at 100-130 degrees.
6. The smoke detection device with the light guiding and scattering structure as recited in claim 1, wherein the light emitting source is an LED lamp (303).
7. The smoke detection device with the light guide scattering structure as claimed in claim 1, wherein a plurality of light emitting diodes and photodiodes are integrated in the sensing chip (301).
8. The smoke detection device with the light guide scattering structure as claimed in any one of claims 1 or 7, wherein the sensing chip (301) is an optical detection module with model number ADPD188 BI.
9. The smoke detection device with the light guide scattering structure as claimed in claim 1, wherein the labyrinth component (201) is further provided with a flow guide plate (2011).
10. A smoke detection device with a light guiding and scattering structure according to claim 1, wherein a horn (202) is arranged in the middle area of the top of said labyrinth cover (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067274.8A CN111080960A (en) | 2020-01-20 | 2020-01-20 | Smoke detection device with light guide scattering structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067274.8A CN111080960A (en) | 2020-01-20 | 2020-01-20 | Smoke detection device with light guide scattering structure |
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| Publication Number | Publication Date |
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| CN111080960A true CN111080960A (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010067274.8A Pending CN111080960A (en) | 2020-01-20 | 2020-01-20 | Smoke detection device with light guide scattering structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113936410A (en) * | 2021-12-06 | 2022-01-14 | 深圳市海曼科技股份有限公司 | Small labyrinth smoke sensor |
| CN114913666A (en) * | 2022-05-11 | 2022-08-16 | 青岛鼎信通讯消防安全有限公司 | Labyrinth smoke detector capable of being detached independently and preventing false alarm and detection method |
-
2020
- 2020-01-20 CN CN202010067274.8A patent/CN111080960A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113936410A (en) * | 2021-12-06 | 2022-01-14 | 深圳市海曼科技股份有限公司 | Small labyrinth smoke sensor |
| CN114913666A (en) * | 2022-05-11 | 2022-08-16 | 青岛鼎信通讯消防安全有限公司 | Labyrinth smoke detector capable of being detached independently and preventing false alarm and detection method |
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Address after: 315706 Li Kaokeng Village, Daxu Town, Xiangshan County, Ningbo City, Zhejiang Province (factory building in the industrial zone) Applicant after: Zhejiang Zhonghuan Keyi fire alarm equipment Co.,Ltd. Address before: 201612 North workshop, 2nd floor, Building 2, No. 168, Xutang Road, Songjiang District, Shanghai Applicant before: Shanghai Zhonghuan Keyi fire alarm equipment Co.,Ltd. |