CN217386468U - Photoelectric smoke detector - Google Patents

Abstract

The application relates to a photoelectric smoke detector, which comprises a labyrinth body, wherein the labyrinth body comprises a shell and a plurality of smoke guide ribs, the plurality of smoke guide ribs are annularly distributed in the shell to form a detection cavity, a smoke guide flow channel is formed between every two adjacent smoke guide ribs, at least part of the smoke guide ribs are provided with special-shaped toothed end parts, and the special-shaped toothed end parts are adjacent to the detection cavity and used for absorbing light rays in a multi-reflection mode; under the condition that no fire disaster and no smoke occur, the special-shaped toothed end part of the smoke guide rib can greatly improve the light absorption performance of the photoelectric smoke detector structure, the possibility that detection light rays emitted by the light emitter are received by the light receiver when no fire disaster occurs is reduced, and the fire disaster false alarm rate is further reduced.

Description

Photoelectric smoke detector

Technical Field

The application relates to the field of smoke detection, in particular to a photoelectric smoke detector.

Background

The photoelectric smoke detector is a device for detecting fire by utilizing absorption and scattering effects of fire smoke on light, and generally can be divided into a light-reducing type and a light-scattering type, wherein the detection precision of the light-scattering type photoelectric smoke detector is closely related to the light-absorbing effect of a labyrinth structure. However, the existing scattered light type photoelectric smoke detector has complex assembly and high cost due to a large number of structural components, or has common light absorption effect due to less bent shielding plates on the outer ring of the labyrinth, so that the false alarm rate is difficult to reduce.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a photoelectric smoke detector that can improve the light absorption effect and reduce the false alarm rate.

A photoelectric smoke detector comprises a photoelectric detector,

the labyrinth body comprises a shell and a plurality of smoke guiding ribs, wherein the plurality of smoke guiding ribs are annularly arranged in the shell to form a detection cavity, and a smoke guiding flow channel is formed between the adjacent smoke guiding ribs, wherein at least part of the smoke guiding ribs are provided with special-shaped toothed end parts, and the special-shaped toothed end parts are adjacent to the detection cavity and are used for absorbing light rays in a multi-reflection mode;

the light emitter is arranged on the labyrinth body and used for emitting detection light rays into the detection cavity; and

the light receiver is correspondingly arranged on the labyrinth body and used for receiving part of scattered light in the detection cavity.

So set up, under the no smoke circumstances of conflagration not taking place, the heterotypic dentate tip of leading the cigarette muscle can make the detection light of light emitter transmission take place the multiple reflection to by absorbing gradually at multiple reflection in-process, improve the extinction performance of photoelectric sensing smoke detector structure by a wide margin, the possibility that light receiver received detection light when reducing not taking place the conflagration, and then reduce conflagration misinformation rate.

In one embodiment, the end of the cigarette guiding bar has at least two edge teeth, and the tip of each edge tooth faces the detection cavity to form a reflection cavity between the adjacent edge teeth.

So set up, the detection light that the light emitter sent can be carried out multiple reflection and scattering by the reflection chamber that arris tooth and arris tooth formed, until detection light is absorbed completely, has avoided by a wide margin to detect the condition that light was received by optical receiver and produced the fire signal wrong report under the conflagration condition not taking place.

In one embodiment, the surface of the edge tooth of the irregularly-shaped toothed end is provided with a plurality of protrusions, so that the reflecting cavity forms a light trap.

So set up, the light trap of formation can further improve the ability that special-shaped dentate tip reflected and absorbed light, further guarantees reliability and accuracy that photoelectric smoke detector conflagration detected.

In one embodiment, the profiled toothed end of the smoke guiding rib is made of a black material.

So set up, black material extinction ability is stronger, can cooperate the reflection chamber to further increase the ability of leading the special-shaped dentate tip of cigarette muscle absorption light to this avoids surveying light and is reflected light receiver department, reduces conflagration misinformation rate.

In one embodiment, the smoke guiding rib with the shaped tooth-shaped end part is arranged opposite to the light emitter.

So set up, under the condition that does not have conflagration smog to shelter from, the light emitter sends detection light and can directly be penetrated the reflection intracavity that special-shaped dentate tip formed to by multiple reflection until absorbing completely under the effect in reflection chamber, avoid light receiver to receive detection light, in order to guarantee under the condition of not taking place the conflagration, the photoelectric smoke sensor can not send fire alarm signal.

In one embodiment, the inner wall of the shell is provided with tooth grooves, and the included angle of the tooth grooves is 60-90 degrees.

According to the arrangement, the tooth grooves are formed in the inner wall of the shell, so that reflected detection light rays in the detection cavity can be further reflected and absorbed, the light absorption performance of the labyrinth body is enhanced, the included angle of the tooth grooves is 60-90 degrees, scattering and absorption of light inside the labyrinth body are facilitated, and the accuracy of detecting the fire disaster condition by the smoke sensor is guaranteed.

In one embodiment, the housing is provided with a plurality of mounting positions, and the mounting positions are provided with limiting parts located on the outer periphery of the housing, wherein the light emitter and the light receiver are respectively and correspondingly mounted on the mounting positions, and the pin positions of the light emitter and the pin positions of the light receiver are respectively limited by the corresponding limiting parts.

So set up, light emitter and light receiver can through the installation position and the spacing portion of installation position stable set up in labyrinth body guarantees in the use, and it is stable to survey light, and light receiver can normal play function, guarantees light emitter and light receiver's functional stability.

In one embodiment, the limiting portion includes a middle protrusion and side protrusions located on two sides of the middle protrusion, two opposite clamping grooves are formed between the two side protrusions and the middle protrusion, one side of each of the two side protrusions, which is close to the middle protrusion, is provided with a limiting hook, and the limiting hooks and the clamping grooves are matched with each other to limit the pin of the optical transmitter or the pin of the optical receiver.

So set up, two pins of light emitter and light receiver can stretch into respectively in two draw-in grooves of spacing portion, and side can be spacing by spacing hook, avoid two pins from the side roll-off of draw-in groove, and spacing hook and draw-in groove mutually supporting's mode can enough make light emitter and light receiver by stable fixed, avoids the maintenance again or changes the inconvenient condition emergence of light emitter and light receiver dismantlement and installation.

In one embodiment, the housing includes a cover, a peripheral cover and a base connected to each other, the peripheral cover is located between the cover and the base, and the peripheral cover is provided with a plurality of smoke inlets, and the smoke inlets are communicated with the detection cavity through the smoke guide flow channel.

So set up, smog can get into from a plurality of cigarette holes of advancing to can flow from leading the cigarette runner and reach and survey the intracavity and be detected, and the casing that the components of a whole that can function independently set up is changeed equipment and processing.

In one embodiment, the aperture of the smoke inlet is 0.7mm-1 mm.

By the arrangement, the aperture of the smoke inlet hole of 0.7mm-1mm can ensure that smoke particles can smoothly enter the detection cavity, and the smoke inlet hole has an insect prevention function, so that an insect prevention net is prevented from being arranged outside the smoke inlet hole to prevent insects, and the consumed materials and the whole volume of the photoelectric smoke detector are reduced.

Compared with the prior art, the photoelectric smoke detector strengthens the scattering and absorbing effects on the detection light of the light transmitter through the special-shaped toothed end part of the smoke guide rib and the tooth grooves arranged on the inner wall of the shell, so that the detection light can be gradually absorbed in multiple reflections, and the phenomenon of fire misinformation caused by the fact that the detection light is received by the light receiver when a fire does not occur is avoided. Just the utility model discloses detector labyrinth structure overall structure is simple, can reach that it is smooth and easy, protection against insects nature is good and assembly and disassembly effect such as facility to advance the cigarette.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a photoelectric smoke detector provided in the present application;

FIG. 2 is an enlarged view of the X portion of FIG. 1;

FIG. 3 is a schematic diagram of a portion of a photoelectric smoke detector provided herein;

fig. 4 is a partially disassembled schematic structure view of the photoelectric smoke detector provided in the present application;

FIG. 5 is an enlarged view of the Y-section of FIG. 4;

FIG. 6 is a schematic cross-sectional view of a photoelectric smoke detector provided herein;

fig. 7 is a schematic view of another structure of the photoelectric smoke detector provided in the present application;

fig. 8 is a schematic cross-sectional view of the closure and the peripheral cap of the present application.

Reference numerals: 100. a photoelectric smoke detector; 10. a labyrinth body; 11. a housing; 111. sealing the cover; 1111. a tooth socket; 112. a peripheral cover; 1121. a smoke inlet hole; 113. a base body; 114. an installation position; 1141. a limiting part; 11411. a side projection; 114111, a limit hook; 11412. a middle bump; 11401. a card slot; 12. a smoke guiding rib; 121. a first smoke guide plate; 122. a second smoke guide plate; 1221. a shaped toothed end; 1222. a reflective cavity; 12221. the edge teeth; 13. a smoke guide flow channel; 14. a probe chamber; 20. a light emitter; 30. an optical receiver.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature or that the first feature is in indirect contact with the second feature via an intermediate medium. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The photoelectric smoke detector is a device for detecting fire by utilizing absorption and scattering effects of fire smoke on light. There are two different processes when smoke particles interact with light: the particles may re-radiate the received energy at the same wavelength, re-radiation may occur in all directions, but the radiation intensity differs in different directions, known as scattering; alternatively, the radiant energy may be converted to other forms of energy, such as thermal energy, chemical energy, or secondary radiation of different wavelengths, referred to as absorption. Therefore, the photoelectric smoke-sensitive detector can be divided into two types, namely a light-reducing type and a light-scattering type according to the absorption and scattering effects of smoke particles on light.

The utility model discloses the structure belongs to scattered light formula type. Scattered light type: the smoke particles entering the shading darkroom generate scattering effect on the light with certain wavelength emitted by the light source, so that the impedance of the light receiving element at a certain included angle position is changed, and the photocurrent is generated. The magnitude of the photocurrent is related to the intensity of scattered light and is determined by the concentration and particle size of smoke particles and whether the smoke particles are colored or not. According to the magnitude of the photocurrent of the light receiving element, namely when the concentration of smoke particles reaches a certain value, the energy of scattered light is enough to generate a certain magnitude of exciting photocurrent, and the exciting photocurrent can be used for exciting a signal processing circuit outside the shading darkroom to send out a fire signal. Obviously, the signal processing circuit outside the shading darkroom adopts different structures and data processing modes, and can form different types of fire detectors, such as a threshold alarm switching value fire detector, an analog judgment analog quantity fire detector and a parameter operation intelligent fire detector.

Accordingly, please refer to fig. 1 to 3, fig. 1 is a schematic structural diagram of a photoelectric smoke detector 100 provided in the present application; FIG. 2 is an enlarged view of the X portion of FIG. 1; fig. 3 is a schematic partial structure diagram of the photoelectric smoke detector 100 provided in the present application.

The application provides a photoelectric smoke detector 100, which is used in the field of fire detection, the photoelectric smoke detector 100 comprises a labyrinth body 10, the labyrinth body 10 comprises a shell 11 and a plurality of smoke guide ribs 12, wherein the plurality of smoke guide ribs 12 are annularly arranged in the shell 11 to form a detection cavity 14, a smoke guide flow channel 13 is formed between the adjacent smoke guide ribs 12, at least part of the smoke guide ribs 12 are provided with a special-shaped toothed end 1221, and the special-shaped toothed end 1221 is adjacent to the detection cavity 14 and is used for absorbing light rays in a multi-reflection mode;

the light emitter 20 is arranged on the maze body 10 and used for emitting detection light into the detection cavity 14; and a light receiver 30, wherein the light receiver 30 is correspondingly disposed on the labyrinth body 10 for receiving a part of the scattered light in the detection cavity 14.

The utility model provides a photoelectric smoke detector 100 under the conflagration smokeless fog circumstances not taking place, the heterotypic cusp tip of leading cigarette muscle 12 can make the detection light of light emitter 20 transmission take place the multiple reflection to by gradually absorbed at the multiple reflection in-process, improve the extinction performance of photoelectric smoke detector 100 structure by a wide margin, the possibility that light receiver 30 received detection light when reducing not taking place the conflagration, and then reduce conflagration misstatement rate.

Referring to fig. 3 again, and referring to fig. 4 and 5 together, fig. 4 is a partially disassembled schematic view of the photoelectric smoke detector provided in the present application; fig. 5 is an enlarged view of the Y-portion in fig. 4.

In the present embodiment, the shaped toothed end 1221 of the smoke guide rib 12 has at least two teeth 12221, and the tip of each tooth 12221 faces the detection cavity 14 to form a reflection cavity 1222 between adjacent teeth 12221. With such an arrangement, the detection light emitted by the light emitter 20 can be reflected and scattered by the teeth 12221 and the reflection cavity 1222 formed by the teeth 12221 for multiple times until the detection light is completely absorbed, thereby greatly avoiding the situation that the light is received by the light receiver 30 and a fire signal is misreported when no fire occurs.

It is understood that the shaped toothed end 1221 of each smoke guide rib 12 may also have three or more teeth 12221, and the reflective cavities 1222 may be formed between adjacent teeth 12221.

Preferably, in an embodiment not shown in the present invention, the surface of the edge teeth 12221 of the shaped toothed end 1221 is provided with a plurality of protrusions (not shown) so that the reflective cavity 1222 forms a light trap. So set up, the light trap that forms can further improve the ability that special-shaped dentate tip reflected and absorbed light, further guarantees the reliability and the accuracy that 100 conflagrations of photoelectric smoke detector detected.

Preferably, in the present embodiment, the irregular toothed end 1221 of the smoke guide rib 12 is made of a black material. So set up because the material extinction ability of black material for other colours is stronger, can cooperate reflection chamber 1222 further to increase the ability that leads the special-shaped dentate end 1221 of cigarette muscle 12 to absorb light to this avoids detecting light to be reflected to light receiver 30 department as far as possible, reduces conflagration false alarm rate.

It can be understood that, in the present embodiment, it is preferable that the body of the smoke guiding rib 12, the housing 11 or the inner wall of the housing 11 is made of black material.

In this embodiment, the smoke guiding rib 12 having the profiled toothed end 1221 is disposed opposite to the light emitter 20. So set up, under the condition that does not have fire smoke to shelter from, light emitter 20 sends detection light can directly shoot in the reflection chamber 1222 that special-shaped dentate end 1221 formed to by multiple reflection until absorbing completely under reflection chamber 1222's effect, avoid light receiver 30 to receive detection light, in order to guarantee under the condition that does not take place the conflagration, photoelectricity smoke sensor can not send fire alarm signal. Preferably, in the present embodiment, all of the plurality of smoke guiding ribs 12 have the shaped toothed end 1221, so as to further ensure that the detection light in the detection cavity 14 can be reflected and absorbed by the shaped toothed end 1221 when no fire occurs.

In the present invention, please refer to fig. 1 again, the housing 11 is provided with a plurality of mounting positions 114, the mounting positions 114 have a limiting portion 1141 located at the outer peripheral side of the housing 11, wherein the light emitter 20 and the light receiver 30 are correspondingly mounted at the mounting positions 114 respectively, and the pin positions of the light emitter 20 and the pin positions of the light receiver 30 are respectively limited by the corresponding limiting portions 1141. So set up, light emitter 20 and light receiver 30 can be through the installation position 114 and the stable setting in maze body 10 of spacing portion 1141 of installation position 114, guarantee the use, and detection light is stable, and light receiver 30 can normal performance, guarantees light emitter 20 and light receiver 30's functional stability.

Preferably, in the present embodiment, there are two light emitters 20, there is one light receiver 30, and correspondingly, in the present embodiment, the housing 11 is provided with three mounting locations 114, specifically, the mounting locations 114 are arranged obliquely, and the detection light of the light emitters 20 is emitted into the detection cavity 14 obliquely upward; further, the two light emitters 20 are respectively a first light emitter tube i and a second light emitter tube ii, wherein a certain angle is formed between the second light emitter tube ii and the light receiver 30; the smoke guiding rib 12 on the opposite side of the emission tube ii has a special-shaped toothed end 1221, and an angle inside the reflection cavity 1222 formed between the edge teeth 12221 of the special-shaped toothed end 1221 enables the detection light to be reflected for multiple times until the light energy is completely absorbed, so that the false alarm rate of the detector labyrinth is reduced (see fig. 6 for light path reflection at one angle, and fig. 6 is a schematic cross-sectional structure diagram of the photoelectric smoke detector 100 provided by the present application).

Preferably, referring to fig. 2 again, in the present embodiment, the position-limiting portion 1141 includes a middle protrusion 11412 and side protrusions 11411 located at two sides of the middle protrusion 11412, two opposite slots 11401 are formed between the two side protrusions 11411 and the middle protrusion 11412, one side of each of the two side protrusions 11411 close to the middle protrusion 11412 is convexly provided with a position-limiting hook 114111, and the position-limiting hook 114111 and the slot 11401 are mutually matched to limit the pin of the optical transmitter 20 or the pin of the optical receiver 30. So set up, two pins of optical emitter 20 and optical receiver 30 can stretch into respectively in two draw-in grooves 11401 of spacing portion 1141, and can be spacing by spacing hook 114111 side, avoid two pins from the side roll-off of draw-in groove 11401, spacing hook 114111 and the mode of draw-in groove 11401 mutually supporting can enough make optical emitter 20 and optical receiver 30 by stable fixed, avoid again the maintenance or change the inconvenient condition emergence of optical emitter 20 and optical receiver 30 dismantlement and installation.

The limiting hook 114111 is a barb shape, and mainly functions to prevent the LED tubes of the light emitter 20 and the light receiver 30 from shifting or falling off, so that the service life of the labyrinth structure of the photoelectric smoke detector 100 is increased, and the detection result is more accurate.

Preferably, referring to fig. 1 again, the housing 11 includes a sealing cover 111, a peripheral cover 112 and a base 113 connected to each other, the peripheral cover 112 is located between the sealing cover 111 and the base 113, the peripheral cover 112 is opened with a plurality of smoke inlets 1121, and the plurality of smoke inlets 1121 are communicated with the detection cavity 14 through the smoke guide flow channel 13. With the arrangement, smoke can enter from the smoke inlet holes 1121, and can flow through the smoke guide channel 13 to reach the detection cavity 14 to be detected, and the shell 11 which is arranged in a split mode is easy to assemble and process.

Preferably, the peripheral cover 112 and the sealing cover 111 are integrally formed so as to be directly fastened to the base 113, so that the detector has a small number of overall structural members, can be fastened and assembled up and down, and is simpler and more convenient to use and small in occupied size.

Referring to fig. 7 and 8, fig. 7 is a schematic view of another view angle structure of the photoelectric smoke detector 100 provided in the present application; fig. 8 is a schematic cross-sectional view of the cover 111 and the peripheral cover 112 according to the present application. In this embodiment, the inner wall of the housing 11 is provided with tooth grooves 1111, and the included angle of the tooth grooves 1111 is 60 ° to 90 °.

Preferably, in the present embodiment, the teeth 1111 are opened on the inner wall of the cover 111. So set up, the tooth's socket 1111 inner wall has been seted up to casing 11 can further reflect and absorb the detection light of being reflected in the detection chamber 14, strengthens the extinction performance of maze body 10, and tooth's socket 1111 contained angle is 60-90 and is most favorable to the scattering and the absorption of maze body 10 inside light, guarantees the accuracy of smoke sensor to the fire condition detection. It is understood that in other embodiments, the tooth slot 1111 may be opened at any position of the inner wall of the housing 11, and is not limited thereto.

Preferably, please refer to fig. 4 again, in this embodiment, the smoke guiding ribs 12 are disposed on the base 113, the plurality of smoke guiding ribs 12 are uniformly spaced, specifically, the smoke guiding ribs 12 include a first smoke guiding plate 121 and a second smoke guiding plate 122 connected to each other, an included angle is formed between the first smoke guiding plate 121 and the second smoke guiding plate 122, so that the smoke guiding flow channel 13 has a certain flow angle, further avoiding interference of impurities except smoke on detection, and thus not affecting smoke inlet but also enabling smoke stagnation in the labyrinth cavity to be better, when smoke reaching a certain concentration enters, the smoke can be detected by the photoelectric smoke detector 100 more sensitively, and a fire situation can be fed back more rapidly.

Wherein, the smoke guiding rib 12 is located on the second smoke guiding plate 122 near the irregular toothed end 1221 of the detection cavity 14. It is understood that, in other embodiments, the first smoke guide plate 121 and the second smoke guide plate 122 may also be smoothly connected curved plates, and the number of the folding surfaces or the curved surfaces formed by the first smoke guide plate 121 and the second smoke guide plate 122 is not limited as long as the smoke guide flow path 13 can have a flowing angle.

Referring again to fig. 8, preferably, the aperture of the smoke inlet 1121 is 0.7mm-1 mm. With the arrangement, the smoke inlet 1121 with the diameter of 0.7mm to 1mm can not only ensure that smoke particles smoothly enter the detection cavity 14, but also ensure that the smoke inlet 1121 has an insect prevention function, so that an insect prevention net is prevented from being arranged outside the smoke inlet 1121 in a surrounding mode to prevent insects, and the whole volume of consumables and the photoelectric smoke detector 100 is reduced. Preferably, in the present embodiment, the smoke inlet 1121 is a square hole with a length and a width of 0.7mm, and it is understood that in other embodiments, the shape and the hole size of the smoke inlet 1121 are not limited herein.

The utility model provides a photoelectric smoke detector 100, photoelectric smoke detector 100 strengthen scattering and the absorption of light transmitter 20 detection light through the special-shaped dentate tip 1221 of leading cigarette muscle 12 and the mode that sets up tooth's socket 1111 at the casing 11 inner wall, make detection light can be absorbed gradually in multiple reflection to this avoids when not taking place the conflagration, and detection light is received by optical receiver 30 and the phenomenon is reported to the wrong report of conflagration appears. Just the utility model discloses the labyrinth structure overall structure of detector is simple, can reach that it is smooth and easy, protection against insects nature is good and assembly and disassembly effect such as facility to advance the cigarette.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (10)

1. A photoelectric smoke detector is characterized by comprising,

the labyrinth body comprises a shell and a plurality of smoke guiding ribs, wherein the plurality of smoke guiding ribs are annularly arranged in the shell to form a detection cavity, and a smoke guiding flow channel is formed between the adjacent smoke guiding ribs, wherein at least part of the smoke guiding ribs are provided with special-shaped toothed end parts, and the special-shaped toothed end parts are adjacent to the detection cavity and are used for absorbing light rays in a multi-reflection mode;

the light emitter is arranged on the labyrinth body and used for emitting detection light rays into the detection cavity; and

the light receiver is correspondingly arranged on the labyrinth body and used for receiving part of scattered light in the detection cavity.

2. The photoelectric smoke detector according to claim 1, wherein the end of the shaped tooth of the smoke guiding rib has at least two edge teeth, and a tip of each edge tooth faces the detection cavity to form a reflection cavity between the adjacent edge teeth.

3. The optical smoke detector according to claim 2, wherein a plurality of protrusions are arranged on the surface of the edge teeth of the end portion of the irregular tooth shape, so that the reflective cavity forms an optical trap.

4. The photoelectric smoke detector of any one of claims 1 to 3, wherein the shaped toothed end of the smoke guide rib is made of a black material.

5. The photoelectric smoke detector of any one of claims 1-3, wherein the smoke guide rib with the shaped toothed end is disposed opposite to the light emitter.

6. The photoelectric smoke detector according to any one of claims 1 to 3, wherein a tooth groove is formed in an inner wall of the housing, and an included angle of the tooth groove is 60 ° to 90 °.

7. The photoelectric smoke detector according to any one of claims 1 to 3, wherein the housing is provided with a plurality of mounting locations, and the mounting locations have stopper portions located on an outer peripheral side of the housing, wherein the light emitter and the light receiver are respectively mounted on the mounting locations correspondingly, and a pin position of the light emitter and a pin position of the light receiver are respectively restricted by the corresponding stopper portions.

8. The smoke detector according to claim 7, wherein the position-limiting portion comprises a middle protrusion and side protrusions located at two sides of the middle protrusion, two opposite slots are formed between the two side protrusions and the middle protrusion, and a position-limiting hook is protruded from one side of each of the two side protrusions near the middle protrusion, and the position-limiting hook and the slot cooperate to limit the pin of the light emitter or the pin of the light receiver.

9. The photoelectric smoke detector according to any one of claims 1 to 3, wherein the housing comprises a cover, a peripheral cover and a base, the cover is disposed between the cover and the base, and the peripheral cover is provided with a plurality of smoke inlets, and the smoke inlets communicate with the detection cavity through the smoke guide channel.

10. The photoelectric smoke detector of claim 9, wherein the aperture of the smoke inlet is 0.7mm-1 mm.

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