A nested integrated smoke detection labyrinth

Abstract

The application provides a nested integrated smoke sensing detection labyrinth, which comprises a labyrinth main body, long strip light blocking ribs and low smoke inlet light blocking ribs which are distributed in a circular ring radiation mode, a smoke effective detection area in a central region, a gap between any adjacent light blocking ribs forming a smoke inlet channel, a nested space formed above the low smoke inlet light blocking ribs for arranging a PCB circuit board set, an inner side end surface of at least one long strip light blocking rib being provided with a mirror reflection surface, and a labyrinth cover covering the top and outer side of the labyrinth main body and the PCB circuit board set and being connected with the bottom plate to form an integrated smoke sensing detection labyrinth. The mirror reflection surface, in combination with a Y-shaped light guide plate arranged in the smoke effective detection area, prolongs the light path and functionally divides the smoke effective detection area, so that the identification of smoke characteristics can be realized. The nested integrated smoke sensing detection labyrinth has high integration, small structure volume, simple process, convenient assembly and smoke detection sensitivity which is not affected by the installation process.

Description

[Technical Field]

[0001] This invention relates to the field of smoke detector technology, and more particularly to a smoke detection maze. [Background Technology]

[0002] In traditional applications, smoke detectors or smoke sensors are generally designed with three parts: a detector housing, an electronic circuit board, and a smoke maze structure. The smoke maze structure is a crucial, independent component, containing a smoke detection zone. The electronic circuit board is then connected and arranged on the outside of the smoke maze structure to detect smoke within that zone. However, this traditional, widespread application means that a single, independent smoke maze does not actually possess smoke detection functionality, and it has the following main drawbacks:

[0003] The product is actually assembled from three independent structures: the detector housing, the circuit board outside the maze, and the smoke maze structure. This results in a relatively large overall size, requiring at least four layers of internal and external structures. Furthermore, since the electronic circuit board is located within the detector housing outside the smoke maze structure, and the transmitter and receiver on the electronic circuit board are only separately embedded into the smoke maze structure during assembly, the manufacturing process is inconvenient and unsuitable for modern machine production. Moreover, the sensitivity is affected by the quality of the installation process of the transmitter and receiver.

[0004] Chinese invention patent No. 202010554729.9, published on September 1, 2020, discloses a horizontal smoke detector maze with a height difference. It includes a maze base and a PCB circuit board, dividing the maze base into a detection zone and a non-detection zone. The bottom of the detection zone is lowered, creating a height difference with the bottom of the non-detection zone. The PCB circuit board is assembled by embedding it into the maze base. However, this invention is essentially no different from the structural arrangement of a traditional smoke detector. The PCB circuit board is still on the outside of the maze structure, only with a staggered structure with a height difference for assembly. Simultaneously, the heads of the transmitting and receiving lights on the PCB circuit board extend into the maze structure.

[0005] In existing technical literature and various smoke detector products on the market, the electronic circuit board and the smoke maze structure are independent structures, and the sensitivity depends more on the installation process. In existing technical products, the maze is only one component of the smoke detector and cannot form a complete product. [Summary of the Invention]

[0006] Therefore, the technical problem to be solved by the present invention is to provide a nested integrated smoke detection maze with high integration, small structure and size, simple process, convenient assembly and sensitivity not affected by the installation process.

[0007] To achieve the aforementioned objectives, the technical solution adopted in this invention is: a nested, integrated smoke detection maze, comprising:

[0008] The maze body has a base plate with smoke-introducing and light-blocking ribs arranged radially in a circular pattern. These include several long light-blocking ribs arranged in a semi-circular radial pattern and several short smoke-introducing and light-blocking ribs arranged in a semi-circular radial pattern. The gaps between any adjacent smoke-introducing and light-blocking ribs form smoke introductory channels, and nested spaces are formed above the tops of the short smoke-introducing and light-blocking ribs. At least one of the long light-blocking ribs has a mirror-reflective surface on its inner end face. The central area enclosed by the radially arranged smoke-introducing and light-blocking ribs is the effective smoke detection zone.

[0009] A PCB circuit board kit, disposed within the nested space, includes a PCB circuit board, a first emitting light, a receiver, and a light guide PCB cover. The PCB circuit board is located in the middle section of the maze body. The first emitting light and the receiver are mounted on the PCB circuit board. The light from the first emitting light passes through the effective smoke detection area, is reflected by the specular reflective surface, and then passes through the effective smoke detection area to the receiver. The light guide PCB cover covers the PCB circuit board and has a first emitting light mounting slot corresponding to the first emitting light and a receiver slot corresponding to the receiver on its front side.

[0010] The maze cover covers the top and outside of the maze body and PCB circuit board kit, and is connected to the base plate to form an integrated smoke detection maze.

[0011] Furthermore, the back of the light guide PCB cover is provided with several short light-blocking ribs arranged in a semi-circular radial pattern, and the gap between any adjacent short light-blocking ribs forms a smoke inlet channel; the area where the short light-blocking ribs are located is the upper smoke inlet area, the area where the short smoke inlet light-blocking ribs are located is the lower smoke inlet area, and the area where the long light-blocking ribs are located is the through smoke inlet area.

[0012] Furthermore, the PCB circuit board kit also has a second emitting lamp, and the front side of the light guide PCB cover plate also has a second spotlight fixing groove corresponding to the second emitting lamp. The light emitted by the second emitting lamp can be received by the receiver after being reflected, scattered by smoke, and diffused by the effective smoke detection area.

[0013] Furthermore, the Y-shaped light guide plate includes a left front baffle, a right front baffle, and a rear straight baffle; the left front baffle is used to block the main emitted light of the first emitting lamp from directly reaching the receiver, the right front baffle is used both to prevent the halo effect generated at the edge of the left front baffle from reaching the receiver and to prevent the emitted light of the first emitting lamp from directly reaching the receiver; the rear straight baffle is used to block the edge emitted light of the first emitting lamp from directly reaching the receiver.

[0014] Furthermore, the Y-shaped light guide plate and the reflective surface further divide the effective detection area into an emitted light smoke attenuation area and a reflected light smoke attenuation area, and the overlapping area of ​​the emitted light smoke attenuation area and the reflected light smoke attenuation area is a bidirectional smoke attenuation area.

[0015] Furthermore, the first spotlight fixing slot, the second spotlight fixing slot, and the receiver slot are all U-shaped arch structures with downward openings.

[0016] Furthermore, both the PCB circuit board and the light guide PCB cover are semi-annular structures, and the outer dimensions of the semi-annular structure match the outer dimensions of the semi-annular structure in the area where the smoke-entry low light-blocking rib is located.

[0017] The short light-blocking ribs, the long light-blocking ribs, and the short light-blocking ribs are all V-shaped structures, and their openings face the same direction, either clockwise or counterclockwise.

[0018] The base plate is circular, and the maze cover is a cylindrical sleeve structure with an insect-proof net on the side. The insect-proof net covers the inlet and outlet of the smoke inlet channel.

[0019] Furthermore, the number of the long light-blocking ribs with mirror-reflective surfaces on the inner end face is 1 to 6.

[0020] The advantages of this invention are as follows: The PCB circuit board kit is placed inside the maze body and connected to the base plate of the maze body after being covered by a maze cover, forming an integrated smoke detection maze. The overall structure is small in size, with one less layer in the internal and external structures compared to conventional designs. It features high integration, material saving, simple manufacturing process, and convenient assembly. It also makes the detection direction clearer and enhances anti-interference capabilities. Since the PCB circuit board kit and the maze body are integrated at the factory, there are no assembly issues during use, resulting in more stable sensitivity. The PCB circuit board divides the entire smoke entry area into an upper smoke entry area, a lower smoke entry area, and a through smoke entry area, with high air permeability, creating a comprehensive smoke envelopment effect. This improves detection sensitivity and facilitates the identification of smoke characteristics (such as black smoke, white smoke, or other colored smoke), resulting in better detection performance and a lower probability of missed detections. By setting mirror-reflective surfaces on the inner end faces of some long light-blocking ribs, the distance of the optical path can be effectively extended, improving detection sensitivity and accuracy, thereby effectively reducing false alarms and missed detections. Furthermore, the mirror-reflective surface, combined with the Y-shaped light guide plate set within the effective smoke detection area, can also achieve functional zoning of the effective smoke detection area, thereby enabling the identification of smoke characteristics and enhancing the function of the smoke detection maze. [Attached Image Description]

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0023] Figure 2 This is an exploded structural diagram of the nested integrated smoke detection maze according to an embodiment of the present invention.

[0024] Figure 3 This is a three-dimensional structural diagram of the maze body according to an embodiment of the present invention.

[0025] Figure 4 This is a side view of the maze body according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the back three-dimensional structure of the light guide PCB cover plate according to an embodiment of the present invention.

[0027] Figure 6 This is a front three-dimensional structural diagram of the light guide PCB cover plate according to an embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the PCB circuit board kit (with the light guide PCB cover removed) combined with the maze body according to an embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram of the three-dimensional structure of the PCB circuit board kit combined with the maze body according to an embodiment of the present invention.

[0030] Figure 9 This is a schematic diagram of the internal structure of the labyrinth cover according to an embodiment of the present invention.

[0031] Figure 10 This is a schematic diagram of the optical path within the effective smoke detection area according to an embodiment of the present invention.

[0032] Figure 11 This is a three-dimensional structural diagram of the Y-shaped light guide plate according to an embodiment of the present invention.

Detailed Implementation Methods

[0033] This invention provides a nested integrated smoke detection maze that features high integration, small size, simple manufacturing process, convenient assembly, and sensitivity unaffected by installation process.

[0034] The technical solution in this invention aims to solve the aforementioned problems. The overall concept is as follows: This invention places a PCB circuit board kit inside the maze body and connects it to the base plate of the maze body after being covered by a maze cover, forming an integrated smoke detection maze. This reduces the number of inner and outer panels compared to conventional designs, resulting in high integration, simple manufacturing, and convenient assembly. It also makes the detection location clearer and enhances anti-interference capabilities. Since the PCB circuit board kit and the maze body are integrated at the factory, there are no assembly issues during use, leading to more stable sensitivity. The PCB circuit board divides the entire smoke entry area into an upper smoke entry area, a lower smoke entry area, and a through-smoke entry area, providing high ventilation and creating an all-around smoke envelopment effect. This improves detection sensitivity and facilitates the identification of smoke characteristics (such as black smoke, white smoke, or other colored smoke), resulting in better detection performance. By setting mirror-reflective surfaces on the inner end faces of some long light-blocking ribs, the optical path distance can be effectively extended, improving detection sensitivity and accuracy, thereby effectively reducing false alarms and missed alarms. In addition, the effective smoke detection area is functionally divided by combining a mirror-reflective surface with a Y-shaped light guide plate, thereby enabling the identification of smoke characteristics and adding the function of the smoke detection maze.

[0035] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0036] Please see Figures 1 to 11 As shown, an embodiment of the nested integrated smoke detection maze 100 of the present invention includes:

[0037] The maze body 1 has a base plate 11, on which are arranged smoke-inlet light-blocking ribs in a circular radial pattern, including several long light-blocking ribs 12 arranged in a semi-circular radial pattern and several short smoke-inlet light-blocking ribs 13 arranged in a semi-circular radial pattern. The gap between any adjacent smoke-inlet light-blocking ribs 13 forms a smoke-inlet channel T, and a nested space K1 is formed above the short smoke-inlet light-blocking ribs 13. At least one (usually 1 to 6 is preferred) of the long light-blocking ribs 12 has a mirror-reflecting surface 15 on its inner end face. The central area enclosed by the circularly radial smoke-inlet light-blocking ribs 13 is the effective smoke detection area K2.

[0038] PCB circuit board kit 2 is disposed within the nested space K1 and includes PCB circuit board 21, first emitting lamp 22, receiver 23, and light guide PCB cover plate 24. PCB circuit board 21 is located in the middle section (height direction) of the maze body 1. The first emitting lamp 21 and the receiver 22 are disposed on PCB circuit board 21. The light from the first emitting lamp 22 passes through the smoke effective detection area K2, is reflected by the specular reflective surface 15, and then passes through the smoke effective detection area to the receiver 22 (simultaneously, the light from the first emitting lamp 22, after being reflected, scattered, or diffused by the smoke in the smoke effective detection area K2, is also received and processed by the receiver 12). The light guide PCB cover plate 24 covers PCB circuit board 21 and has a first spotlight fixing groove 241 corresponding to the first emitting lamp 22 and a receiver groove 242 corresponding to the receiver 23 on its front side.

[0039] The maze cover 3 has mesh holes 31 on the side and light-guiding ridges 32 on the inner bottom surface. The maze cover 3 covers the upper and outer sides of the maze body 1 and the PCB circuit board kit 2, and is connected to the base plate 11 to form an integrated smoke detection maze 100.

[0040] In this embodiment, the PCB circuit board 21 is nested inside the maze body 1 and fixed. Specifically, it can be fixed by screws to the smoke-inlet low light-blocking rib 13, forming an integrated structure. Electronic components are directly arranged within the maze structure, making the light-guiding PCB cover 24 and the PCB circuit board 21 part of the maze wall of the effective smoke detection area K2 (the smoke-inlet light-blocking rib allows smoke to enter the effective smoke detection area K2 but prevents external light from entering, thus resembling an outer wall, hence called the maze wall). This special arrangement results in better sensitivity and accuracy during actual detection. Compared to the maze structure of traditional smoke detectors, since it eliminates the need for inner and outer panels for electronic components, the overall inner and outer panels are reduced by at least one layer, resulting in clearer detection direction, stronger anti-interference capabilities, cost savings, simplified manufacturing process, and easier assembly.

[0041] Furthermore, the above embodiments can be further improved as follows:

[0042] Mainly such as Figure 6As shown, the back of the light guide PCB cover plate 24 is also provided with several short light-blocking ribs 14 arranged in a semi-circular radial pattern. The top height of the short light-blocking ribs 14 is the same as the top height of the long light-blocking ribs 12. The gap between any adjacent short light-blocking ribs 14 forms a smoke inlet channel T. The area where the short light-blocking ribs 14 are located is the upper smoke inlet area, the area where the smoke inlet short light-blocking ribs 13 are located is the lower smoke inlet area, and the area where the long light-blocking ribs 12 are located is the through smoke inlet area. Thus, smoke can be penetrated through multiple smoke inlet areas, resulting in high air permeability. Multiple smoke entry zones are staggered. The PCB circuit board 21 is located in the middle of the maze body 1. It can surround the smoke around the first emitting lamp 21 and the receiver 22 (the existing PCB circuit boards are all located at one end of the effective smoke detection area K2, so there is only smoke in a certain direction of the emitting lamp and the receiver, and it is impossible to form a full-range smoke envelopment effect), forming a full-range smoke entry channel with 360 degrees of unobstructedness. This is beneficial to improving the detection sensitivity and also beneficial to the identification of smoke characteristics (such as black smoke, white smoke or other colored smoke), thus enhancing the detection function. The size of the multiple smoke entry zones can be designed according to actual needs.

[0043] The PCB circuit board kit 2 also includes a second emitting lamp 25. There can be more than one second emitting lamp 25. The front side of the light guide PCB cover plate 24 also has a second spotlight fixing groove 243 corresponding to the second emitting lamp 25. The light emitted by the second emitting lamp 25, after reflection, smoke scattering, and diffuse reflection through the effective smoke detection area K2, can be received by the receiver 23. Part of the light emitted by the first emitting lamp 22 and the second emitting lamp 25 at different times, after being reflected, scattered, or diffused by the smoke, will be received and processed by the receiver 23 to determine the presence and concentration of smoke.

[0044] The first spotlight fixing slot 241, the second spotlight fixing slot 243 and the receiver slot 242 are all U-shaped arch structures with downward openings. This allows them to fix the first emitting lamp 22, the second emitting lamp 25 and the receiver 23 well, while also providing shielding on the top and sides of the first emitting lamp 22 and the second emitting lamp 25, thus forming a relatively concentrated beam of light.

[0045] Both the PCB circuit board 21 and the light guide PCB cover plate 24 are semi-annular structures. The outer dimensions of the semi-annular structure match the outer dimensions of the semi-annular structure in the area where the smoke-inlet low-profile light-blocking rib is located, so as not to block the effective smoke detection area K2.

[0046] A Y-shaped light guide plate 4 is provided within the effective smoke detection area K2 to guide the light within the effective smoke detection area to the receiver 23. The Y-shaped light guide plate 4 is used to guide the light from the first emitting lamp 22 and the second emitting lamp 25 through different detection scenarios. The Y-shaped light guide plate includes a left front baffle 41, a right front baffle 42, and a rear straight baffle 43. The left front baffle 41 is used to block the main emitted light (the front light) from the first emitting lamp 22 from directly reaching the receiver 23, thereby ensuring that the main emitted light is reflected by the mirror reflection surface 15 before reaching the receiver 23, thus extending the light path. The right front baffle 42 is used both to prevent the halo effect generated at the edge of the left front baffle 41 from reaching the receiver 23 and causing detection errors, and to allow the emitted light from the first emitting lamp 22 to directly reach the receiver 23, serving as a supplement to the blocking effect of the left front baffle 41. The rear straight baffle 43 is used to block the edge emitted light (the rear light) of the first emitting lamp 22 from directly reaching the receiver, playing a good guiding role.

[0047] During operation, smoke entering through the mesh 31 on the side of the maze cover 3 is guided by the long light-blocking rib 12, the short light-blocking rib 13, and the short light-blocking rib 14, and then enters the effective smoke detection area K2. The light from the first emitting lamp 22 and the second emitting lamp 25, after being scattered, reflected, or diffused by the smoke, enters the receiver 23 at a specific location. The light attenuates as it travels through the smoke, reducing the intensity of the received light, thus determining the presence and concentration of smoke.

[0048] The Y-shaped light guide plate 4 and the reflective surface 15 further divide the effective smoke detection area K2 into an emitted light smoke attenuation area and a reflected light smoke attenuation area. The overlapping area of ​​the emitted light smoke attenuation area and the reflected light smoke attenuation area is a bidirectional smoke attenuation area. Figure 7 As shown, B1, B2, A1, and A2 together constitute the emitted light smoke attenuation zone, while A1, A2, and C1 constitute the reflected light smoke attenuation zone. Here, A1 and A2 are the common functional areas of these two zones. Smoke undergoes diffuse reflection in these common functional areas, forming a bidirectional smoke attenuation zone. By rationally designing the dimensions of each part of the Y-shaped light guide plate, the size of the reflection zone and the path of the reflected light can be adjusted, thereby improving the light transmission characteristics. Based on the intensity changes of the reflected light and the data reflected in the smoke channel, different characteristics of smoke can be distinguished, and the microcontroller processing unit can calculate the characteristics of the smoke type accordingly. This is particularly effective in distinguishing between black and white smoke. For example, adjusting the length of the left front baffle 41 of the Y-shaped light guide plate 4 at the front end of B2 can adjust the size of the A2 area, which is an effective reflection zone. By adjusting the size of the effective reflection zone and the ratio of the attenuation path, the characteristics of the smoke can be determined by the ratio value of the signal collected by the receiver.

[0049] The low smoke-blocking rib 13, the long light-blocking rib 12, and the short light-blocking rib 14 are all V-shaped structures with the same opening orientation, either clockwise or counterclockwise. The V-shaped structure guides the smoke while blocking external light from entering the effective smoke detection area K2 and causing interference. Similarly, light within the effective smoke detection area K2 will not leak to the outside.

[0050] The base plate 11 is a circular base plate, and the inner surface of the base plate is also provided with light-guiding protrusions 112. The maze cover 3 is a cylindrical sleeve structure, and the side is provided with an insect-proof net 33. The insect-proof net 33 covers the inlet and outlet of the smoke inlet channel.

[0051] To further improve light reflectivity, the number of mirror-reflecting surfaces 15 is typically set to two or more, as shown in the figure, which is four. By placing the mirror-reflecting surfaces 15 at the inner end of the elongated light-blocking ribs, the distance of the light path can be effectively extended. Without increasing the size of the maze structure, the light path can be extended to twice the diameter of the effective smoke detection area K2, thus improving detection sensitivity. This allows for the design of a smaller maze structure without compromising smoke detection performance.

[0052] In addition, as one feasible approach, to facilitate the nesting of the maze structure within other products and increase the system's integration, different areas of the base plate 11 can be designed: when the area of ​​the base plate 11 is the same as the area of ​​the maze cover 3, the base plate 11 serves as the shell bottom of the maze body 1; when the area of ​​the base plate 11 is larger than the area of ​​the maze cover 3, the base plate 11 can also be directly used as the structural bottom shell of other detectors.

[0053] The advantages of this invention are as follows: The PCB circuit board kit is placed inside the maze body and connected to the base plate of the maze body after being covered by a maze cover, forming an integrated smoke detection maze. The overall structure is small in size, with one less layer in the internal and external structures compared to conventional designs. It features high integration, material saving, simple manufacturing process, and convenient assembly. It also makes the detection direction clearer and enhances anti-interference capabilities. Since the PCB circuit board kit and the maze body are integrated at the factory, there are no assembly issues during use, resulting in more stable sensitivity. The PCB circuit board divides the entire smoke entry area into an upper smoke entry area, a lower smoke entry area, and a through smoke entry area, with high air permeability, creating a comprehensive smoke envelopment effect. This improves detection sensitivity and facilitates the identification of smoke characteristics (such as black smoke, white smoke, or other colored smoke), resulting in better detection performance and a lower probability of missed detections. By setting mirror-reflective surfaces on the inner end faces of some long light-blocking ribs, the distance of the optical path can be effectively extended, improving detection sensitivity and accuracy, thereby effectively reducing false alarms and missed detections. Furthermore, the mirror-reflective surface, combined with the Y-shaped light guide plate set within the effective smoke detection area, can also achieve functional zoning of the effective smoke detection area, thereby enabling the identification of smoke characteristics and enhancing the function of the smoke detection maze.

[0054] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A nested, integrated smoke detection maze, characterized in that: include: The maze body has a base plate with smoke-introducing and light-blocking ribs arranged radially in a circular pattern. These include several long light-blocking ribs arranged in a semi-circular radial pattern and several short smoke-introducing and light-blocking ribs arranged in a semi-circular radial pattern. The gaps between any adjacent smoke-introducing and light-blocking ribs form smoke introductory channels, and nested spaces are formed above the tops of the short smoke-introducing and light-blocking ribs. At least one of the long light-blocking ribs has a mirror-reflective surface on its inner end face. The central area enclosed by the radially arranged smoke-introducing and light-blocking ribs is the effective smoke detection zone. A PCB circuit board kit is disposed within the nested space and includes a PCB circuit board, a first emitting lamp, a receiver, and a light guide PCB cover. The PCB circuit board is located in the middle section of the maze body. The first emitting light and the receiver are disposed on the PCB circuit board. The light from the first emitting light passes through the effective smoke detection area, is reflected by the mirror reflective surface, and then passes through the effective smoke detection area to the receiver. The light guide PCB cover plate covers the PCB circuit board, and has a first spotlight fixing slot corresponding to the first emitting lamp and a receiver slot corresponding to the receiver on the front side. The back side also has several short light-blocking ribs arranged radially in a semi-circular pattern. The gap between any adjacent short light-blocking ribs forms a smoke entry channel; the area where the short light-blocking ribs are located is the upper smoke entry area, the area where the short smoke-entry light-blocking ribs are located is the lower smoke entry area, and the area where the long light-blocking ribs are located is the through smoke entry area; and The maze cover covers the top and outside of the maze body and PCB circuit board kit, and is connected to the base plate to form an integrated smoke detection maze.

2. The nested integrated smoke detection maze as described in claim 1, characterized in that: The PCB circuit board kit also has a second emitting lamp, and the front side of the light guide PCB cover plate also has a second spotlight fixing groove corresponding to the second emitting lamp. The light emitted by the second emitting lamp can be received by the receiver after being reflected, scattered by smoke and diffused by the effective smoke detection area.

3. The nested integrated smoke detection maze as described in claim 2, characterized in that: The effective smoke detection area is equipped with a Y-shaped light guide plate, which includes a left front baffle, a right front baffle, and a rear straight baffle. The left front baffle is used to block the main emitted light of the first emitting lamp from directly reaching the receiver. The right front baffle is used to prevent the halo effect generated at the edge of the left front baffle from reaching the receiver, and also to prevent the emitted light of the first emitting lamp from directly reaching the receiver. The rear straight baffle is used to block the edge emitted light of the first emitting lamp from directly reaching the receiver.

4. The nested integrated smoke detection maze as described in claim 3, characterized in that: The Y-shaped light guide plate and the reflective surface further divide the effective smoke detection area into an emitted light smoke attenuation area and a reflected light smoke attenuation area. The area where the emitted light smoke attenuation area and the reflected light smoke attenuation area overlap is a bidirectional smoke attenuation area.

5. The nested integrated smoke detection maze as described in claim 2, characterized in that: The first spotlight mounting slot, the second spotlight mounting slot, and the receiver slot are all U-shaped arch structures with downward openings.

6. The nested integrated smoke detection maze as described in claim 1, characterized in that: Both the PCB circuit board and the light guide PCB cover are semi-annular structures, and the outer dimensions of the semi-annular structure match the outer dimensions of the semi-annular structure in the area where the smoke-entry low light-blocking rib is located.

7. The nested integrated smoke detection maze as described in claim 1, characterized in that: The short light-blocking ribs, the long light-blocking ribs, and the short light-blocking ribs are all V-shaped structures, and their openings face the same direction, either clockwise or counterclockwise.

8. The nested integrated smoke detection maze as described in claim 1, characterized in that: The base plate is circular, and the maze cover is a cylindrical sleeve structure with an insect-proof net on the side. The insect-proof net covers the inlet and outlet of the smoke inlet channel.

9. The nested integrated smoke detection maze as described in claim 1, characterized in that: The number of the long light-blocking ribs with mirror-reflective surfaces on the inner end face is 1 to 6.

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