Smoke detector

Abstract

The utility model discloses a smoke detector, which comprises a shell, an optical detection piece and an annular component, the shell is provided with an accommodating space and a smoke inlet hole, and a detection area is formed in the accommodating space; the optical detection part is positioned in the accommodating space and is used for detecting the smoke concentration; the annular component is located in the containing space. The annular component is provided with an outer ring surface and an inner ring surface, the outer ring surface and the shell form a first ventilation gap, a second ventilation gap is formed between one end, deviating from the optical detection piece, of the annular component and the shell, and the inner ring surface is annularly arranged to form a ventilation channel; the first ventilation gap, the second ventilation gap and the ventilation channel are communicated in sequence; the smoke inlet hole is opposite to the inner ring surface and is communicated with the first ventilation gap, and the ventilation channel is communicated with the detection area. According to the scheme, the problem that the anti-interference capability of the smoke detector is poor can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire fighting devices, in particular to a smoke detector. Background Art

[0002] Smoke detectors are used in the field of fire detection. They can detect smoke concentration and alarm in time to avoid fire.

[0003] The smoke detector includes a shell and an optical detection component arranged in the shell. The optical detection component includes a light source emitting component and a light source receiving component. The light source receiving component is used to receive the light emitted by the light source emitting component. Specifically, a detection area is provided in the shell, and external smoke enters the detection area through a hole arranged in the shell. The light emitted by the light source emitting component enters the detection area. When the light hits the smoke, the smoke can reflect and scatter the light, so that it can be received by the light source receiving component. Therefore, the smoke concentration is judged by the intensity of the light signal received by the light source receiving component, and then an alarm is sounded when the smoke concentration is high.

[0004] In the related art, dust in the air can easily enter the detection area through the holes on the housing and deposit in the detection area. Dust deposited in the detection area can easily increase the amount of light reflected in the detection area. Therefore, smoke detectors in the related art are easily disturbed by dust and cause false alarms, thereby causing great interference to the performance of the smoke detector. Therefore, the anti-interference ability of smoke detectors in the related art is poor. Utility Model Content

[0005] The utility model discloses a smoke detector to solve the problem that the smoke detector has poor anti-interference ability.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A smoke detector comprising:

[0008] A housing, wherein the housing is provided with a receiving space and a smoke inlet hole, and a detection area is formed in the receiving space;

[0009] An optical detection component, the optical detection component is located in the accommodating space, and the optical detection component is used to detect smoke concentration;

[0010] An annular component, wherein the annular component is located in the accommodating space; the annular component has an outer annular surface and an inner annular surface, the outer annular surface and the shell form a first ventilation gap, a second ventilation gap is formed between the end of the annular component away from the optical detection component and the shell, and the inner annular surface is arranged to form a ventilation channel; the first ventilation gap, the second ventilation gap and the ventilation channel are connected in sequence; the smoke inlet is arranged opposite to the inner annular surface and is connected to the first ventilation gap, and the ventilation channel is connected to the detection area.

[0011] The technical solution adopted by the utility model can achieve the following beneficial effects:

[0012] The smoke detector disclosed by the utility model has an outer ring surface of an annular component and a shell forming a first ventilation gap, an end of the annular component away from the optical detection component and the shell forming a second ventilation gap, and an inner ring surface of the annular component is arranged to form a ventilation channel. The smoke inlet, the first ventilation gap, the second ventilation gap, the ventilation channel and the detection area are connected in sequence. In this scheme, the first ventilation gap, the second ventilation gap and the ventilation channel form a bent gap interlayer, and when dust enters the gap interlayer, the dust can adhere to and be deposited on the surface of the gap interlayer. Therefore, most of the dust is settled in the gap interlayer, thereby reducing the dust concentration entering the detection area, thereby avoiding the risk of false alarm caused by dust interference in the smoke detector. Therefore, the smoke detector disclosed in the present application has good anti-interference ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of a smoke detector disclosed in an embodiment of the utility model;

[0015] Figure 2 A cross-sectional view of a smoke detector disclosed in an embodiment of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the cover of the smoke detector disclosed in the embodiment of the utility model;

[0017] Figure 4 for Figure 3 Bottom view of

[0018] Figure 5 It is a structural schematic diagram of the annular component of the smoke detector disclosed in the embodiment of the utility model;

[0019] Figure 6 for Figure 5 Bottom view of

[0020] Figure 7 It is a structural schematic diagram of a mounting base of a smoke detector disclosed in an embodiment of the utility model;

[0021] Figure 8 for Figure 7 A top view of

[0022] Fig. 9 and Fig.10 It is a schematic diagram of the structure of the optical detection component of the smoke detector disclosed in the embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 100-housing, 101-accommodation space, 102-detection area, 110-mounting seat, 111-fixing flange, 111a-avoidance notch, 111b-supporting boss, 112-battery slot, 120-cover, 121-annular side wall, 1211-smoke inlet, 122-end wall, 1221-first through hole, 1222-sound outlet, 200-optical detection element, 210-circuit board, 211-avoidance notch, 212-matching protrusion, 220-light source emission Part, 230-light source receiving part, 240-reset button, 310-first ventilation gap, 320-second ventilation gap, 330-ventilation channel, 400-annular member, 401-outer annular surface, 402-inner annular surface, 410-first cylinder, 420-second cylinder, 430-annular plate, 431-second through hole, 450-filter screen, 460-crimping protrusion, 510-first rib, 520-second rib, 600-sound alarm, 700-fixing plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The technical solutions disclosed in various embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 10 As shown, an embodiment of the utility model discloses a smoke detector, which includes a housing 100 , an optical detection element 200 and an annular component 400 .

[0028] The shell 100 is the installation base of the smoke detector, which provides installation space for other components of the smoke detector. The shell 100 is provided with a receiving space 101 and a smoke inlet 1211, and a detection area 102 is formed in the receiving space 101. The detection area 102 here refers to the space for detecting smoke. The receiving space 101 has a structure that can define the detection area 102. Smoke can only be detected in the detection area 102. The optical detection component 200 is located in the receiving space 101, and the optical detection component 200 is used to detect the smoke concentration. At this time, the smoke enters the detection area 102 through the smoke inlet 1211 opened on the shell 100, and the smoke concentration is detected by the optical detection component 200.

[0029] Specifically, the optical detection component 200 may include a circuit board 210 and at least one light source emitting component 220 and at least one light source receiving component 230 disposed on the circuit board 210. The circuit board 210 is used to control the light source emitting component 220 and the light source receiving component 230, and can also provide electrical energy for the light source emitting component 220 and the light source receiving component 230. The light source emitting component 220 emits light to the detection area 102, and the light source receiving component 230 is used to receive the light emitted by the light source emitting component 220. Smoke can increase the reflectivity of light, so the smoke concentration is detected by the amount of light received by the light source receiving component 230. The light source emitting component 220 here can be an LED (Light-Emitting Diode), and the light source receiving component 230 can be a photoelectric sensor. Of course, the optical detection component 200 is not limited to the above components, and can also include other structures, which are not limited herein.

[0030] The annular member 400 is located in the accommodating space 101, and the annular member 400 has an outer annular surface 401 and an inner annular surface 402. The outer annular surface 401 here refers to the outer peripheral surface of the annular member 400, and the inner annular surface 402 refers to the inner peripheral surface of the annular member 400. The outer annular surface 401 and the inner annular surface 402 are both annular surfaces extending in the circumferential direction. The outer annular surface 401 forms a first ventilation gap 310 with the shell 100, and a second ventilation gap 320 is formed between the end of the annular member 400 away from the optical detection part 200 and the shell 100, and the inner annular surface 402 is arranged to form a ventilation channel 330. The ventilation channel 330 formed by the inner annular surface 402 here refers to the hollow area in the annular member 400. The first ventilation gap 310, the second ventilation gap 320 and the ventilation channel 330 are connected in sequence. The smoke inlet 1211 is arranged opposite to the inner annular surface 402 and is connected to the first ventilation gap 310, and the ventilation channel 330 is connected to the detection area 102. At this time, smoke enters the detection area 102 after passing through the smoke inlet 1211, the first ventilation gap 310, the second ventilation gap 320 and the ventilation channel 330 in sequence.

[0031] In the present application, the first ventilation gap 310 is formed by the outer annular surface 401 of the annular member 400 and the first area of ​​the housing 100. Since the outer annular surface 401 is an annular structure extending in the circumferential direction, the first area is also an annular structure extending in the circumferential direction of the annular member 400. At the same time, the first ventilation gap 310 formed by the outer annular surface 401 and the first area is also an annular structure extending in the circumferential direction of the annular member 400. The end of the annular member 400 away from the optical detection part 200 can be the first end, and the end of the annular member 400 facing the optical detection part 200 can be the second end. At this time, the second ventilation gap 320 is formed by the first end of the annular member 400 and the second area of ​​the housing 100. Here, it can be understood that there is a certain gap between the end surface of the first end and the second area, thereby forming the second ventilation gap 320.

[0032] In the present application, the first end is disposed adjacent to the outer annular surface 401, so the first region is also disposed adjacent to the second region, and at this time, a certain angle is formed between the first ventilation gap 310 and the second ventilation gap 320, and in addition, the inner annular surface 402 is also disposed adjacent to the first end, so the second ventilation gap 320 and the ventilation channel 330 also have a certain angle. Therefore, the first ventilation gap 310, the second ventilation gap 320 and the ventilation channel 330 form a labyrinth gap sandwich formed by bending.

[0033] In the embodiment disclosed in the present application, the first ventilation gap 310, the second ventilation gap 320, and the ventilation channel 330 form a bent labyrinth gap interlayer. When dust enters the gap interlayer, the dust can adhere to and deposit on the surface of the labyrinth gap interlayer. Therefore, most of the dust settles in the gap interlayer, thereby reducing the dust concentration entering the detection area 102, thereby avoiding the risk of false alarm caused by dust interference in the smoke detector. Therefore, the smoke detector disclosed in the present application has good anti-interference ability.

[0034] In addition, the curved labyrinth gap interlayer formed by the first ventilation gap 310, the second ventilation gap 320, and the ventilation channel 330 can further prevent ambient light from entering the detection area 102, so the smoke detector disclosed in the present application can further improve the anti-interference performance against ambient light.

[0035] In addition, the maze gap interlayer can slow down the fluidity of smoke in scenarios with different wind speeds, thereby improving the anti-interference performance against wind speed.

[0036] In the embodiment disclosed in the present application, the labyrinth gap interlayer is formed by different surfaces of the annular component 400 and the shell 100, so that fewer parts are needed to form the labyrinth gap interlayer, and the structure is simple, thereby reducing the manufacturing cost of the smoke detector.

[0037] The smoke detector is usually installed on the roof, and the optical detection member 200 is usually arranged at one end of the shell 100 close to the roof, so the direction in which the second end of the annular member 400 points to the first end is in the vertical downward direction. At this time, the second area mentioned above is the bottom wall of the shell 100, the top wall of the shell 100 is fixedly connected to the roof, and the first area is the side wall of the shell 100. Therefore, when dust enters the first ventilation gap 310 from the smoke inlet 1211, part of the dust will adhere to the outer annular surface 401 and the inner surface of the side wall, and part of the dust will move downward and will be deposited on the inner surface of the bottom wall due to gravity. In addition, since the position of the detection area 102 is higher than the position of the second ventilation gap 320, it is difficult for dust to enter the detection area 102 again. Therefore, the smoke detector disclosed in the present application has good dust resistance.

[0038] In an optional solution, there may be multiple smoke inlet holes 1211, which may be spaced apart along the circumference of the annular member 400. In this case, the smoke detector can be fully circumferentially smoke-inlet, thereby improving the smoke-inlet performance of the smoke detector in different directions.

[0039] In another optional embodiment, a plurality of partition ribs may be provided between the housing 100 and the annular member 400, and the plurality of partition ribs may be arranged at intervals along the circumference of the annular member 400, and the first ventilation gap 310 may be divided into a plurality of first sub-gaps arranged at intervals along the circumference of the annular member 400, and the second ventilation gap 320 may be divided into a plurality of second sub-gaps arranged at intervals along the circumference of the annular member 400. Each first sub-gaps is connected to its corresponding second sub-gaps. Each first sub-gaps is connected to at least one smoke inlet hole 1211.

[0040] In this solution, a plurality of separation ribs can separate the first ventilation gap 310 and the second ventilation gap 320 to form a plurality of independent ventilation areas, thereby ensuring that smoke entering from all directions is not likely to affect each other, thereby ensuring a better smoke entry effect in all directions.

[0041] The separation ribs in the above embodiment may be separate components, and the separation ribs may be fixed to the housing 100 or the annular member 400 by bonding, clamping, riveting, etc. Alternatively, the separation ribs may be integrally formed with the housing 100. Alternatively, the separation ribs may be integrally formed with the annular member 400.

[0042] In another optional solution, each separation rib may include a first rib 510 and a second rib 520, and a plurality of first ribs 510 are disposed on the outer annular surface 401, and the plurality of first ribs 510 divide the first ventilation gap 310 into a plurality of first sub-gaps arranged at intervals along the circumference of the annular member 400. A plurality of second ribs 520 are disposed on the housing 100, and the plurality of second ribs 520 can divide the second ventilation gap 320 into a plurality of second sub-gaps arranged at intervals along the circumference of the annular member 400. In this case, each first rib 510 corresponds to one second rib 520.

[0043] In this solution, the separation rib is divided into two parts, one part is processed and set on the annular member 400, and the other part is processed and set on the housing 100, thereby reducing the processing difficulty of the separation rib. At the same time, the separation rib is distributed on the annular member 400 and the housing 100, which can simultaneously reinforce the strength of the annular member 400 and the housing 100, thereby improving the reliability of the annular member 400 and the housing 100. In addition, since each first rib 510 corresponds to a second rib 520, the first rib 510 and the second rib 520 can also locate the installation position of the housing 100 and the annular member 400, thereby improving the assembly accuracy of the smoke detector.

[0044] In another optional embodiment, the housing 100 may include a mounting seat 110 and a cover 120, the mounting seat 110 and the cover 120 may enclose a receiving space 101, and the mounting seat 110 and the cover 120 may be detachably connected. For example, the mounting seat 110 and the cover 120 may be connected by means of snaps, magnets, bolts, etc. The detection area 102 is formed on the side of the mounting seat 110 facing the annular member 400, that is, the detection area 102 in this article may be formed on the mounting seat 110.

[0045] The cover body 120 may include an annular side wall 121 and an end wall 122 connected to each other, and the end wall 122 is located at one end of the annular side wall 121, so the cover body 120 in the present application is a cylindrical structural member with one end open and the other end closed. The mounting seat 110 and the end wall 122 are respectively located at the two ends of the annular side wall 121, and the mounting seat 110 is connected to the open end of the cover body 120. The annular side wall 121 and the outer annular surface 401 can form a first ventilation gap 310, and the end wall 122 can form a second ventilation gap 320 with the end of the annular member 400 away from the optical detection member 200. The smoke inlet 1211 is opened in the annular side wall 121. The annular side wall 121 here is the first area mentioned above, and the end wall 122 is the second area mentioned above.

[0046] In this solution, the mounting base 110 and the cover body 120 are detachably connected, so it is easy to disassemble the mounting base 110 and the cover body 120, and thus it is easy to disassemble and repair the smoke detector, thereby improving the maintainability of the smoke detector.

[0047] In another optional embodiment, the radial dimension of the annular side wall 121 gradually decreases in the direction extending from the mounting seat 110 to the end wall 122. Figure 2 The radial dimension here can be a radial diameter, radius or area. At this time, along the direction extending from the mounting seat 110 to the end wall 122, the cross-sectional area of ​​the annular side wall 121 gradually decreases, so the annular side wall 121 is a tapered trumpet-shaped structure. In this solution, the annular side wall 121 adopts a trumpet-mouth structure, so at high wind speeds, the smoke will flow along the curved surface of the trumpet-mouth structure and will not quickly enter the housing 100, thereby ensuring the detection stability of the smoke detector at different wind speeds.

[0048] Furthermore, in the direction extending from the mounting seat 110 to the end wall 122, the radial dimension of the outer annular surface 401 can be gradually reduced. At this time, the outer annular surface 401 is also a trumpet-shaped structure, and the tapering direction of the outer annular surface 401 is the same as the tapering direction of the annular side wall 121. At this time, since the annular side wall 121 and the outer annular surface 401 are both tapered structures, the first ventilation gap 310 formed by the two is also a trumpet-shaped structure. This solution can further ensure the detection stability of the smoke detector under different wind speeds, thereby further improving the wind speed resistance stability of the smoke detector.

[0049] In another optional embodiment, the radial dimension of the inner annular surface 402 may be gradually increased in the direction extending from the mounting seat 110 to the end wall 122. At this time, the radial dimension of the ventilation channel 330 is gradually increased in the direction extending from the mounting seat 110 to the end wall 122. The radial dimension of the ventilation channel 330 at one end facing the mounting seat 110 is smaller than the radial dimension of the ventilation channel 330 at one end facing the end wall 122. The end of the ventilation channel 330 facing the mounting seat 110 is an air outlet port, and the end of the ventilation channel 330 facing the mounting seat 110 is an air inlet port, so the area of ​​the air outlet port is smaller than the area of ​​the air inlet port. The smoke in the second ventilation gap 320 enters the ventilation channel 330 from the air inlet port of the ventilation channel 330, and then enters the detection area 102 from the air outlet port of the ventilation channel 330.

[0050] In this solution, the outlet port area of ​​the ventilation channel 330 is small, and the inlet port area is large, so the ventilation channel 330 has a convergence effect, thereby improving the fluidity of the smoke. In addition, when the smoke enters the ventilation channel 330, it can flow along the annular surface in a spiral, so that the smoke will not flow into the detection area 102 quickly, thereby further ensuring the detection stability of the smoke detector under different wind speeds.

[0051] In the above embodiment, the annular member 400 can be processed from a whole substrate, and the outer annular surface 401 and the inner annular surface 402 are both surfaces on the same solid structure. In this case, the annular member 400 is a solid structure, so the volume and weight of the annular member 400 are large, thereby increasing the overall volume and weight of the smoke detector.

[0052] Based on this, in another optional embodiment, as Figure 2 As shown, the annular member 400 may include a first cylinder 410, an annular plate 430 and a second cylinder 420. The first cylinder 410 and the second cylinder 420 may be connected by the annular plate 430, and the annular plate 430 is located at the same end of the first cylinder 410 and the second cylinder 420. The first cylinder 410 may be arranged around the annular plate 430. The annular plate 430 may be arranged around the second cylinder 420.

[0053] The first cylinder 410 has an outer annular surface 401 on one side facing away from the second cylinder 420. At this time, the first cylinder 410 and the first region above form a first ventilation gap 310. The annular plate 430 and the housing 100 form a second ventilation gap 320. At this time, the annular plate 430 and the second region form a second annular gap. The second cylinder 420 has an inner annular surface 402 on one side facing away from the first cylinder 410.

[0054] In this solution, the annular member 400 is formed by splicing the first cylinder 410, the second cylinder 420 and the annular plate 430. There is a cavity area between the first cylinder 410 and the second cylinder 420, so the annular member 400 is a cavity plate-like structure. Therefore, compared with the solid structure of the annular member 400, the volume and weight of the cavity plate-like structure are also lighter. Therefore, the overall volume and weight of the smoke detector can be reduced.

[0055] In addition, the cavity area between the first cylinder 410 and the second cylinder 420 can also be used to avoid other components of the smoke detector, thereby reducing the stacking size of the smoke detector.

[0056] In order to further prevent dust from entering the detection area 102, in another optional embodiment, the annular member 400 may be provided with a filter 450, and the filter 450 may cover the ventilation channel 330. In this solution, the filter 450 can further filter the dust, thereby further preventing dust from entering the detection area 102, thereby further improving the anti-dust interference capability of the smoke detector.

[0057] In addition, the filter 450 can also filter small flying insects, thereby preventing the small flying insects from entering the detection area 102 and affecting the performance of the smoke detection device.

[0058] Optionally, the filter 450 can select a suitable mesh size according to actual needs, which is not limited herein.

[0059] In another optional embodiment, the housing 100 may have a fixed flange 111 extending along one side facing the annular member 400, and the fixed flange 111 encloses a detection area 102. In this case, the inner area enclosed by the fixed flange 111 is the detection area 102 in this article. The fixed flange 111 may be connected to the annular member 400.

[0060] Here, the second end of the annular member 400 may be provided with a connecting flange, which is connected to the fixing flange 111. The connecting flange may be provided on at least one of the first cylinder 410, the annular plate 430 or the second cylinder 420 mentioned above. Figure 1 As shown, the connecting flange can be disposed on the second cylinder 420. Alternatively, the fixing flange 111 can be directly connected to the annular member 400, and the gas outlet port of the second cylinder 420 is connected to the fixing flange 111.

[0061] In this solution, the fixing flange 111 can not only form the detection area 102 but also realize the connection with the annular member 400, thereby reducing the number of assembly parts of the smoke detector, thereby making the consistency of the smoke detection component higher.

[0062] In the above embodiment, the inner diameter of the air outlet port of the second cylinder 420 is the same as the inner diameter of the fixing flange 111 , which makes it easier for smoke to enter the detection area 102 .

[0063] In another optional embodiment, the circuit board 210 of the optical detection element 200 may be provided with a position-avoiding notch 211, and at least a portion of the fixing flange 111 may be located in the position-avoiding notch 211.

[0064] In this solution, at least a portion of the fixing flange 111 can be located in the avoidance notch 211 of the circuit board 210, so that the circuit board 210 cooperates with the fixing flange 111 by nesting, thereby greatly reducing the arrangement area of ​​the circuit board 210 and the fixing flange 111, thereby reducing the overall volume of the smoke detector.

[0065] In another optional embodiment, the annular member 400 may be provided with a crimping protrusion 460, and the crimping protrusion 460 may be provided with a receiving groove. The receiving groove is used to receive the light source emitting element 220 or the light source receiving element 230. In this solution, the crimping protrusion 460 can press the light source emitting element 220 and the light source receiving element 230, thereby improving the installation stability of the light source emitting element 220 and the light source receiving element 230. In addition, the light source emitting element 220 or the light source receiving element 230 can be located in the receiving groove, thereby preventing the light source emitting element 220 or the light source receiving element 230 from being damaged, thereby improving the safety of the light source emitting element 220 and the light source receiving element 230.

[0066] In the above embodiment, a first tooth structure can be provided in the accommodating groove, and a second tooth structure can be provided on the light source emitting element 220 or the light source receiving element 230. The first tooth structure and the second tooth structure can be plugged together. This solution can further improve the installation stability of the light source emitting element 220 and the light source receiving element 230.

[0067] In one solution, the number of light source emitting elements 220 may be two, and the number of light source receiving elements 230 may be one. In this case, the number of crimping protrusions 460 is three, and one crimping protrusion 460 corresponds to one light source emitting element 220 or one light source receiving element 230. Of course, the number of light source emitting elements 220 and light source receiving elements 230 may be other numbers, which is not limited herein.

[0068] In another optional embodiment, the fixing flange 111 may be provided with an avoidance notch 111a, and a supporting boss 111b may be provided at the avoidance notch 111a; a mating protrusion 212 is provided on the edge of the circuit board 210 toward the avoidance notch 211, and the mating protrusion 212 is provided on the supporting boss 111b; each of the mating protrusions 212 is provided corresponding to a light source emitting component 220 or a light source receiving component 230.

[0069] In this solution, the light source emitting element 220 and the light source receiving element 230 can be arranged at the avoidance notch 111a, and at least part of the light source emitting element 220 and the light source receiving element 230 can extend into the detection area 102 through the avoidance notch 111a. At this time, the installation position of the optical detection element 200 can be moved toward one side of the mounting seat 110, so that the stacking height of the optical detection element 200 and the mounting seat 110 can be reduced, thereby further reducing the volume of the smoke detector.

[0070] In addition, the support boss 111b provided at the avoidance notch 111a is connected to the matching protrusion 212 at the edge of the circuit board 210. Therefore, the support boss 111b can not only support the circuit board 210, but also locate the installation position of the circuit board 210, thereby improving the assembly accuracy of the circuit board 210 and the mounting seat 110.

[0071] In another optional solution, at least part of the crimping protrusion 460 is located at the avoidance notch 211, and in this case, the crimping protrusion 460 can be filled in the avoidance notch 111a. The crimping protrusion 460 can complete the circumferential side of the fixed flange 111, so that smoke is not easy to enter other areas. At the same time, the crimping protrusion 460 cooperates with the avoidance notch 111a of the fixed flange 111 to locate the installation position of the annular member 400 and the mounting seat 110, thereby improving the installation accuracy.

[0072] In one solution, one of the circuit board 210 and the mounting seat 110 may be provided with a positioning hole, and the other may be provided with a positioning post, and the positioning post is positioned and matched with the positioning hole. In this case, the assembly accuracy of the circuit board 210 and the mounting seat 110 can also be improved by the positioning post and the positioning hole.

[0073] In the above embodiment, a reset button 240 may be provided on the circuit board 210, and the reset button 240 is used to cancel the alarm state of the smoke detector. Specifically, when the smoke detector alarms, it is necessary to manually restore the smoke detector to a non-alarm state, and the alarm can be canceled by pressing the reset button 240. In the above embodiment, the reset button 240 is usually located in the housing 100, so the housing 100 needs to be disassembled to expose the reset button 240 on the circuit board 210. This operation method is easy to cause damage to the internal components of the smoke detector.

[0074] To this end, in another optional embodiment, the housing 100 may be provided with a first through hole 1221. The annular member 400 may be provided with a second through hole 431. The first through hole 1221 may be arranged opposite to the second through hole 431, and the reset button 240 may be arranged opposite to the second through hole 431. In this solution, the user can operate the reset button 240 through the first through hole 1221 and the second through hole 431, so there is no need to disassemble the housing 100, so as to simplify the reset operation method of the smoke detector. At the same time, during the reset operation, it is not necessary to open the housing 100, so it is not easy to damage the internal components, thereby improving the reliability of the smoke detector.

[0075] Optionally, the user can sequentially extend the slender rod structure into the first through hole 1221 and the second through hole 431, and then press the reset button 240. The slender rod structure here can be a professional operating rod, or a screwdriver, a wire, a card ejector pin of a mobile phone, etc. There is no specific limitation on the slender rod structure herein.

[0076] Alternatively, a mounting rod is inserted into the first through hole 1221 and the second through hole 431, and the reset button 240 can be directly pressed by the pressing rod. The pressing rod can extend out of the housing 100 to facilitate the user to perform the pressing operation.

[0077] In an optional solution, the first through hole 1221 may be opened on the end wall 122 mentioned above, and the second through hole 431 may be correspondingly opened on the annular plate 430 mentioned above.

[0078] In the above embodiment, the smoke detector is provided with a sound alarm 600. When the optical detection element 200 detects that the smoke concentration in the detection area 102 exceeds a preset value, the sound alarm 600 is triggered to emit an alarm sound. The sound alarm 600 can be arranged on the mounting seat 110. In this case, the optical detection element 200 and the sound alarm 600 are both arranged on the mounting seat, which requires increasing the volume of the mounting seat 110, thus making the mounting seat 110 larger, which is not conducive to the miniaturization of the smoke detector.

[0079] To this end, in another optional embodiment, the sound alarm 600 can be arranged on the end wall 122 and located between the end wall 122 and the annular member 400. The sound alarm 600 can be arranged opposite to at least part of the ventilation channel 330. The end wall 122 is provided with a sound outlet hole 1222, and the sound alarm 600 is connected to the sound outlet hole 1222. Specifically, when the optical detection member 200 detects that the smoke concentration in the detection area 102 exceeds a preset value, the sound alarm 600 is triggered to emit an alarm sound, which is transmitted from the sound outlet hole 1222 to the outside of the housing 100.

[0080] In this solution, the sound alarm 600 is arranged on the end wall 122 of the cover body 120, so only the optical detection member 200 can be arranged on the mounting seat 110, thereby reducing the volume of the mounting seat 110, which is more conducive to the miniaturization of the smoke detector. In addition, the sound alarm 600 can be arranged opposite to at least part of the ventilation channel 330, and the ventilation channel 330 can avoid the sound alarm 600, so the stacking height of the smoke detector can be further reduced.

[0081] Optionally, the sound alarm 600 may be a buzzer, a speaker or other device, and of course may also be other devices, which is not limited herein.

[0082] In another optional embodiment, the smoke detector may further include a fixing plate 700, and the fixing plate 700 may be fixedly connected to a mounting base such as a wall, a roof, or a ceiling by means of bolts, rivets, or other components. The fixing plate 700 may be detachably connected to the housing 100, and specifically, the mounting seat 110 may be connected to the fixing plate 700 by means of buckles, bolts, magnets, or other components. Of course, the mounting seat 110 and the fixing plate 700 may also be connected by other structures, which are not limited herein. The housing 100 and the components installed in the housing 100 here constitute the main structure of the smoke detector. Therefore, when the housing 100 is removed from the fixing plate 700, the main structure of the smoke detector is removed and pulled down from the fixing plate 700, thereby facilitating the installation and removal of the smoke detector.

[0083] In another optional embodiment, the mounting base 110 may also be provided with a battery slot 112 for installing batteries to provide power to the smoke detector. The number of battery slots 112 may be specifically set according to the number of batteries, and is not limited herein.

[0084] In the embodiments disclosed in the present application, the light transmission channel in the detection area 102 is set differently according to the different numbers of light source emitting elements 220 and light source receiving elements 230. Therefore, the specific structure of the light transmission channel in the detection area 102 can be flexibly selected according to actual needs and is not limited herein.

[0085] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0086] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A smoke detector, characterized in that: include: A housing (100), wherein the housing (100) is provided with a receiving space (101) and a smoke inlet hole (1211), and a detection area (102) is formed in the receiving space (101); An optical detection component (200), the optical detection component (200) being located in the accommodating space (101), and the optical detection component (200) being used to detect smoke concentration; An annular component (400), wherein the annular component (400) is located in the accommodating space (101); the annular component (400) has an outer annular surface (401) and an inner annular surface (402); the outer annular surface (401) and the shell (100) form a first ventilation gap (310); a second ventilation gap (320) is formed between the end of the annular component (400) away from the optical detection component (200) and the shell (100); the inner annular surface (402) is arranged in a ring to form a ventilation channel (330); the first ventilation gap (310), the second ventilation gap (320) and the ventilation channel (330) are connected in sequence; the smoke inlet hole (1211) is arranged opposite to the inner annular surface (402) and is connected to the first ventilation gap (310); the ventilation channel (330) is connected to the detection area (102).

2. The smoke detector according to claim 1, characterized in that: A plurality of dividing ribs are arranged between the shell (100) and the annular component (400), and the plurality of dividing ribs are arranged at intervals along the circumference of the annular component (400), and the first ventilation gap (310) and the second ventilation gap (320) are respectively divided into a plurality of first sub-gaps and a plurality of second sub-gaps arranged at intervals along the circumference of the annular component (400), and each of the first sub-gaps is connected to its corresponding second sub-gaps; the number of the smoke inlet holes (1211) is multiple, and each of the first sub-gaps is connected to at least one of the smoke inlet holes (1211).

3. The smoke detector according to claim 2, characterized in that: Each of the separating ribs comprises a first rib (510) and a second rib (520); a plurality of the first ribs (510) are arranged on the outer annular surface (401); the plurality of the first ribs (510) separate the first ventilation gap (310) into a plurality of the first sub-gaps arranged at intervals along the circumference of the annular component (400); and a plurality of the second ribs (520) are arranged on the shell (100); the plurality of the second ribs (520) separate the second ventilation gap (320) into a plurality of the second sub-gaps arranged at intervals along the circumference of the annular component (400).

4. The smoke detector according to claim 1, characterized in that: The housing (100) comprises a mounting seat (110) and a cover body (120), the mounting seat (110) and the cover body (120) enclose the accommodating space (101), the mounting seat (110) and the cover body (120) are detachably connected, and the detection area (102) is formed on a side of the mounting seat (110) facing the annular member (400); The cover body (120) comprises an annular side wall (121) and an end wall (122) which are connected to each other; the mounting seat (110) and the end wall (122) are respectively located at two ends of the annular side wall (121); the annular side wall (121) and the outer annular surface (401) form the first ventilation gap (310); the end wall (122) and an end of the annular component (400) which is away from the optical detection component (200) form the second ventilation gap (320); and the smoke inlet hole (1211) is opened on the annular side wall (121).

5. The smoke detector according to claim 4, characterized in that: In the direction extending from the mounting seat (110) to the end wall (122), the radial dimension of the annular side wall (121) gradually decreases; and / or, In a direction extending from the mounting seat (110) toward the end wall (122), the radial dimension of the outer annular surface (401) gradually decreases.

6. The smoke detector according to claim 4, characterized in that: In a direction extending from the mounting seat (110) toward the end wall (122), the radial dimension of the inner annular surface (402) gradually increases.

7. The smoke detector according to claim 1, characterized in that: The annular component (400) comprises a first cylinder (410), an annular plate (430) and a second cylinder (420); the first cylinder (410) and the second cylinder (420) are connected via the annular plate (430), and the annular plate (430) is located at the same end of the first cylinder (410) and the second cylinder (420); the first cylinder (410) is arranged around the annular plate (430), and the annular plate (430) is arranged around the second cylinder (420); The first cylinder (410) has the outer annular surface (401) on the side facing away from the second cylinder (420), the annular plate (430) and the shell (100) form the second ventilation gap (320), and the second cylinder (420) has the inner annular surface (402) on the side facing away from the first cylinder (410).

8. The smoke detector according to claim 1, characterized in that: A fixing flange (111) extends from one side of the housing (100) toward the annular component (400), the fixing flange (111) encloses the detection area (102), and the fixing flange (111) is connected to the annular component (400).

9. The smoke detector according to claim 8, characterized in that: The annular component (400) is provided with a crimping protrusion (460), and the crimping protrusion (460) is provided with a receiving groove; the optical detection component (200) comprises a circuit board (210) and at least one light source emitting component (220) and at least one light source receiving component (230) arranged on the circuit board (210); the circuit board (210) is arranged in the receiving space (101), and the circuit board (210) is provided with a avoiding notch (211), at least part of the fixing flange (111) is located in the avoiding notch (211), and the receiving groove is used to accommodate the light source emitting component (220) or the light source receiving component (230).

10. The smoke detector according to claim 9, characterized in that: The fixing flange (111) is provided with an avoidance notch (111a), and a supporting boss (111b) is arranged at the avoidance notch (111a); a matching protrusion (212) is arranged on the edge of the circuit board (210) in the direction of the avoidance notch (211), and the matching protrusion (212) is arranged on the supporting boss (111b); each matching protrusion (212) is arranged corresponding to one of the light source emitting components (220) or one of the light source receiving components (230).

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