Linear-beam smoke fire detector

Abstract

This invention discloses a linear beam smoke detector, comprising a smoke collection cylinder, a laser transceiver, and a dust filter. The smoke collection cylinder is vertically arranged and connected to the external environment, with a through bottom to collect rising smoke. A reflective layer is laid on the inner wall of the smoke collection cylinder. The laser transceiver is coaxially mounted inside the smoke collection cylinder and connected to a motor, which is fixedly connected to the smoke collection cylinder to allow the laser transceiver to rotate horizontally within the cylinder. The side wall of the laser transceiver has an output end and a receiving end; the laser emitted from the output end is reflected by the reflective layer and then enters the receiving end. The dust filter is coaxially fitted between the laser transceiver and the smoke collection cylinder and connected to the laser transceiver. The dust filter has a light-passing hole that matches the optical path of the laser transceiver. Several brushes are provided on the outer wall of the dust filter, and the brushes are attached to the surface of the reflective layer. This invention solves the technical problem that the false alarm probability of existing linear beam smoke detectors gradually increases with the increase in usage time.

Description

Technical Field

[0001] This invention relates to the field of wire take-up technology, and more specifically to a linear beam smoke detector. Background Technology

[0002] In order to provide timely fire warnings, smoke detectors are generally required to be installed in indoor places to sense indoor smoke and determine whether a fire has occurred. Among them, linear beam smoke detectors are more commonly used.

[0003] Existing linear beam smoke detectors generally consist of a laser transceiver and a reflector. The laser transceiver outputs a laser beam, which is reflected back to the receiver by the reflector to form a complete light-receiving path. If smoke rises indoors, it will inevitably block the light-receiving path to some extent, causing the light signal intensity at the receiver to weaken. When the smoke concentration reaches a certain value, causing the light signal intensity at the receiver to weaken to a preset value, the smoke detector will sound an alarm to indicate that a fire is likely to occur or has already occurred.

[0004] The aforementioned linear beam smoke detector still has the following problems: the light signal intensity is affected not only by the concentration of smoke, but also by the reflectivity of the reflector. In actual use, the reflector surface is very likely to gradually accumulate dust or impurities. This will not only cause the light signal intensity to gradually weaken, but also cause unnecessary diffuse reflection in the optical path. Both of these will cause the light signal at the receiving end to gradually weaken or disappear, thus gradually increasing the probability of false alarms from the smoke detector. Summary of the Invention

[0005] The purpose of this invention is to provide a linear beam smoke detector that solves the technical problem that the false alarm probability of existing linear beam smoke detectors gradually increases with the increase of usage time.

[0006] This invention is achieved through the following technical solution:

[0007] A linear beam smoke detector includes: a smoke collection cylinder, which is vertically arranged and connected to the external environment, with a through bottom to collect rising smoke, and a reflective layer on the inner wall of the smoke collection cylinder; a laser transceiver, which is coaxially mounted inside the smoke collection cylinder and connected to a motor, which is fixedly connected to the smoke collection cylinder to enable the laser transceiver to rotate horizontally inside the smoke collection cylinder, with an output end and a receiving end on the side wall of the laser transceiver, and the laser emitted from the output end being reflected by the reflective layer and then entering the receiving end; and a dustproof cylinder, which is coaxially fitted between the laser transceiver and the smoke collection cylinder and connected to the laser transceiver, with a light-passing hole that matches the optical path of the laser transceiver, and a plurality of brushes on the outer wall of the dustproof cylinder that are in contact with the surface of the reflective layer.

[0008] Optionally, the outer diameter of the dust-blocking cylinder is slightly smaller than the inner diameter of the smoke-collecting cylinder, so as to form a dust-falling chamber between the dust-blocking cylinder and the smoke-collecting cylinder; a dust-collecting ring is detachably connected to the bottom of the smoke-collecting cylinder, and an annular dust-collecting groove is opened on the top of the dust-collecting ring, the dust-collecting groove is aligned with the dust-falling chamber and located directly below the dust-falling chamber.

[0009] Optionally, the brush is a vertically arranged strip, and the length of the brush matches the height of the reflective layer; multiple brushes are provided, and all the brushes are arranged in a ring at uniform intervals on the outer wall of the dustproof cylinder.

[0010] Optionally, the top of the dust collection ring has an installation groove, the dust collection groove is located at the bottom of the installation groove, the outer wall of the installation groove is threaded to the outer wall of the smoke collection cylinder, and the inner wall of the installation groove is in contact with the inner wall of the dust baffle cylinder, so that the dust collection chamber and the dust collection groove are in a sealed communication.

[0011] Optionally, the inner wall of the mounting groove is provided with a plurality of balls, which contact the inner wall of the dustproof cylinder.

[0012] Optionally, the inner ring of the dust collection ring is provided with a filter screen, the diameter of which matches the inner diameter of the dust collection ring.

[0013] Optionally, the bottom of the laser transceiver is connected to a rotating shaft, which is coaxially arranged with the smoke collection tube. Several brush arms are connected to the bottom end of the rotating shaft. The brush arms are horizontally arranged, and the bottom surface of the brush arms is provided with bristles. The bristles are in contact with the top surface of the filter screen.

[0014] Optionally, the bottom of the laser transceiver is convex in a spherical or conical shape.

[0015] Optionally, the light-passing aperture is configured as a strip-shaped aperture extending in the vertical direction, and the output end and the receiving end are spaced apart in the vertical direction.

[0016] Optionally, a pair of light-limiting plates are provided parallel to the inner wall of the dust-proof cylinder and the laser transceiver. The light-limiting plates are vertically arranged to form a light-limiting interlayer between the pair of light-limiting plates. The light-limiting interlayer is connected to the light-passing hole. The output end and the receiving end are arranged vertically spaced in the light-limiting interlayer. The output end points to any one of the light-limiting plates so that the light path can be reflected in the light-limiting interlayer.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] This invention provides a linear beam smoke detector. By incorporating a laser transceiver and a reflective layer to form a light-receiving path, the detector detects the concentration of rising smoke by assessing whether this path is obstructed (specifically, by the reduction in the intensity of the light signal at the receiving end), thus determining whether to trigger an alarm. Furthermore, a smoke collection cylinder is incorporated. This cylinder, with its closed top, gathers and accumulates the rising smoke, preventing inaccurate smoke concentration monitoring due to excessive space. Its cylindrical annular inner wall serves as the structural basis for the reflective layer, which is also designed as a matching cylindrical ring. When the laser transceiver is positioned along the axis of the reflective layer and emits light radially towards any point on the layer, the light is effectively reflected inward, ensuring smooth signal reception. Finally, a dust-proof cylinder and a motor are integrated, connecting the laser transceiver to the motor and the dust-proof cylinder to the laser. The transceiver connection utilizes a motor to continuously rotate the laser transceiver, which indirectly drives the dust-blocking cylinder. A brush is installed on the outer wall of the dust-blocking cylinder. During the cylinder's rotation, the brush continuously sweeps the reflective layer surface, ensuring its reflective properties at all times. Furthermore, the swept-down dust and impurities are blocked from entering the dust-blocking cylinder, preventing them from obstructing the laser transceiver's path and causing false alarms. Simultaneously, a light-passing hole is provided in the dust-blocking cylinder, ensuring it always aligns with the laser transceiver's path. This guarantees that the light path remains in contact with the reflective layer while the cylinder continues to rotate, ensuring the path remains stable and unaffected by the brush. Through the coordinated operation of these components, dust and impurities on the reflective layer surface can be continuously and effectively removed, solving the technical problem of the increasing false alarm rate of existing linear beam smoke detectors over time. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 A cross-sectional schematic diagram of a linear beam smoke detector provided in an embodiment of the present invention;

[0021] Figure 2 This is a first top sectional view of a linear beam smoke detector provided in an embodiment of the present invention;

[0022] Figure 3 This is a first top sectional view of a linear beam smoke detector provided in an embodiment of the present invention;

[0023] Figure 4 This is a top view schematic diagram of the filter of a linear beam smoke detector provided in an embodiment of the present invention.

[0024] The attached diagram shows the markings and corresponding component names:

[0025] 10-Smoke collection hopper; 11-Reflective layer; 12-Dust collection ring; 121-Dust collection trough; 122-Mounting trough; 13-Filter screen; 20-Laser transceiver; 201-Output end; 202-Receiver end; 21-Motor; 30-Dust baffle; 31-Light passage hole; 32-Brush; 33-Dust collection chamber; 40-Rotating shaft; 41-Brush arm; 411-Brush bristles; 50-Light limiting plate; 51-Light limiting interlayer. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0027] Please refer to Figures 1 to 4This invention provides a linear beam smoke detector, comprising: a smoke collection cylinder 10, which is vertically arranged and connected to the external environment, with a through bottom to collect rising smoke, and a reflective layer 11 on the inner wall of the smoke collection cylinder 10; and a second component including a laser transceiver 20, which is coaxially disposed within the smoke collection cylinder 10, and connected to a motor 21, which is fixedly connected to the smoke collection cylinder 10 so that the laser transceiver 20 can rotate horizontally within the smoke collection cylinder 10. The transceiver 20 has an output end 201 and a receiving end 202 on its side wall. The laser emitted from the output end 201 is reflected by the reflective layer 11 and then enters the receiving end 202. The third part includes a dustproof tube 30, which is coaxially fitted between the laser transceiver 20 and the smoke collection tube 10 and connected to the laser transceiver 20. The dustproof tube 30 has a light-passing hole 31, which is matched with the optical path of the laser transceiver 20. The outer wall of the dustproof tube 30 is provided with several brushes 32, which are attached to the surface of the reflective layer 11.

[0028] This invention provides a linear beam smoke detector. By incorporating a laser transceiver 20 and a reflective layer 11 to form a light-receiving path, the detector detects the concentration of rising smoke by assessing whether this path is obstructed (specifically, by the degree of reduction in the light signal intensity at the receiver 202) to determine whether to trigger an alarm. Furthermore, a smoke collection cylinder 10 is incorporated. This cylinder, with its closed top, gathers and accumulates the rising smoke, preventing inaccurate smoke concentration monitoring due to excessive space. On the other hand, the cylindrical annular inner wall serves as the structural basis for the reflective layer 11, making the reflective layer 11 also a matching cylindrical annular shape. When the laser transceiver 20 is located on the axis of the reflective layer 11 and emits light radially towards any position of the reflective layer 11, it can be effectively reflected inward by the reflective layer 11 to ensure smooth reception of the optical signal. Based on this, by setting up a dustproof cylinder 30 and a motor 21, the laser transceiver 20 is connected to the motor 21, and the dustproof cylinder 30 is connected to the laser transceiver. The laser transceiver 20 is connected to the motor 21, which drives the laser transceiver 20 to rotate continuously, indirectly driving the dustproof cylinder 30 to rotate. A brush 32 is installed on the outer wall of the dustproof cylinder 30. During the rotation of the dustproof cylinder 30, the brush 32 continuously sweeps the surface of the reflective layer 11, ensuring its reflective performance at all times. Furthermore, the swept-down dust and impurities are blocked by the dustproof cylinder 30, preventing them from entering the interior and thus avoiding the problem of dust and impurities obstructing the light transmission path and causing false alarms from the laser transceiver 20. Simultaneously, a light-passing hole 31 is provided in the dustproof cylinder 30, ensuring that the light-passing hole 31 is always aligned with the light transmission path. This ensures that the light path remains in contact with the reflective layer 11 while maintaining continuous rotation, guaranteeing the stable existence of the light transmission path and preventing it from being affected by the brush 32. Through the cooperation of these components, the dust and impurities on the surface of the reflective layer 11 can be continuously and effectively removed, solving the technical problem that the false alarm probability of existing linear beam smoke detectors gradually increases with usage time.

[0029] It should be noted that the laser transceiver 20 mentioned above can be selected from any linear laser transceiver in the prior art according to the actual situation, as long as it can successfully emit and receive linear lasers. This is the prior art, and will not be elaborated further here.

[0030] It should be noted that the shape and size of the light-passing aperture 31 can be set according to the actual use and the specific situation of the light transmission and reception path of the laser transceiver 20.

[0031] It should be noted that, preferably, the output end 201 and the receiving end 202 of the laser transceiver 20 are spaced apart to form an angled light transmission path, thereby increasing the area of ​​interaction with the flue gas and improving sensitivity.

[0032] It should be noted that the speed of motor 21 does not need to be too fast, as long as it can ensure that brush 32 can continuously brush the surface of reflective layer 11. The speed and the preset value of optical signal of receiver 202 of laser transceiver 20 can be adjusted appropriately according to the actual environment. Theoretically, the more dust and impurities there are in the environment, the faster the speed needs to be adjusted, and the lower the preset value of optical signal of receiver 202 needs to be adjusted.

[0033] In order to collect the floating dust and impurities swept off by the brush 32, the outer diameter of the dust-blocking cylinder 30 is slightly smaller than the inner diameter of the smoke-collecting cylinder 10, so as to form a dust-collecting chamber 33 between the dust-blocking cylinder 30 and the smoke-collecting cylinder 10; a dust-collecting ring 12 is detachably connected to the bottom of the smoke-collecting cylinder 10, and an annular dust-collecting groove 121 is opened on the top of the dust-collecting ring 12. The dust-collecting groove 121 is aligned with the dust-collecting chamber 33 and located directly below the dust-collecting chamber 33.

[0034] With the above settings, the swept-down dust and impurities fall down along the dust collection chamber 33 into the dust collection trough 121 under the action of gravity for collection. The dust collection ring 12 is detachably connected to the smoke collection duct 10. After working for a period of time, the dust collection ring 12 can be removed, the accumulated dust and impurities in the dust collection trough 121 can be cleaned, and then it can be reinstalled.

[0035] In order to improve the brushing efficiency of the brush 32 and resist the swinging force during the rotation of the laser transceiver 20 to a certain extent, the brush 32 is a vertically arranged strip, and the length of the brush 32 matches the height of the reflective layer 11; there are multiple brushes 32, and all the brushes 32 are evenly spaced in a ring on the outer wall of the dustproof cylinder 30.

[0036] The vertically arranged strip-shaped brushes 32 can fully cover the reflective layer 11. During rotation, they can thoroughly sweep the surface of the reflective layer 11, avoiding missed areas. Furthermore, when the vertically arranged strip-shaped brushes 32 are brushing, floating dust and impurities will concentrate on one side of the width direction of the brushes 32 (depending on the direction of rotation). At this time, the floating dust and impurities will fall smoothly into the dust collection groove 121 without obstruction along the gap between two adjacent brushes 32, without getting stuck on the brushes 32.

[0037] To further explain the specific structure of the dust collection ring 12, the top of the dust collection ring 12 has an installation groove 122, and the dust collection groove 121 is located at the bottom of the installation groove 122. The outer wall of the installation groove 122 is threadedly connected to the outer wall of the smoke collection cylinder 10, and the inner wall of the installation groove 122 is in contact with the inner wall of the dust baffle cylinder 30, so that the dust collection chamber 33 and the dust collection groove 121 are in a sealed communication.

[0038] Through the above settings, the dust collection ring 12 and the smoke collection cylinder 10 are detachably connected by using the mounting groove 122 and the threaded connection. The bottom of the mounting groove 122 limits the depth of the smoke collection cylinder 10 screwed in, and the inner wall of the mounting groove 122 limits the dust baffle cylinder 30, preventing unnecessary swinging during its rotation. Furthermore, through the above settings, the dust collection chamber 33 and the dust collection groove 121 are sealed and connected to prevent floating dust and impurities from leaking out.

[0039] In order to reduce the friction between the inner wall of the mounting groove 122 and the dust filter cylinder 30 and enable the dust filter cylinder 30 to rotate smoothly, the inner wall of the mounting groove 122 is provided with a number of ball bearings (not shown in the figure), and the ball bearings contact the inner wall of the dust filter cylinder 30.

[0040] In order to filter dust and impurities (even those with high temperatures) in the flue gas and prevent them from entering the flue gas collection cylinder 10, adhering to the inner wall of the flue gas collection cylinder 10, or severely obstructing the input end 201 and the output end 202, or even damaging the laser transceiver 20, the inner ring of the dust collection ring 12 is provided with a filter screen 13, the diameter of which matches the inner diameter of the dust collection ring 12.

[0041] By setting the filter 13 and setting the mesh size of the filter 13, the air and smoke can be appropriately filtered for different usage environments, preventing dust and impurities that may be carried inside from entering the smoke collection duct 10, adhering to the inner wall of the smoke collection duct 10, or severely blocking the input end 201 and the output end 202, or even damaging the laser transceiver 20.

[0042] In order to effectively clean the filter screen 13 without blocking the smoke, the bottom of the laser transceiver 20 is connected to a rotating shaft 40, which is coaxially arranged with the smoke collection tube 10. The bottom end of the rotating shaft 40 is connected to several brush arms 41, which are horizontally arranged. The bottom surface of the brush arm 41 is provided with bristles 411, which are in contact with the top surface of the filter screen 13.

[0043] With the above setup, the motor 21 drives the laser transceiver 20 to rotate, which in turn drives the rotating shaft 40 to rotate, thereby causing the brush arm 41 to sweep across the top surface of the filter screen 13. This allows the brush bristles 411 to continuously and effectively clean the filter screen 13, preventing impurities and dust in the air or flue gas from adhering to the filter screen 13 and reducing its throughput. Furthermore, the brush arm 41 only partially covers the filter screen 13, ensuring that a large area of ​​the filter screen 13 remains exposed, which will not affect the smooth entry of flue gas into the smoke collection stack 10.

[0044] In order to guide the flue gas entering the flue duct 10 and prevent the flue gas from accumulating at the bottom of the laser transceiver 20, the bottom of the laser transceiver 20 is convex in a spherical or conical shape.

[0045] In order to optimize the light receiving path, the light-passing hole 31 is set as a strip-shaped hole extending in the vertical direction, and the output end 201 and the receiving end 202 are spaced apart in the vertical direction.

[0046] With the above settings, the light-passing hole 31 is set as a vertically arranged strip hole, which allows the distance between the output end 201 and the receiving end 202 to be further reduced, thereby increasing the included angle of the light-passing and receiving paths, increasing the area of ​​interaction between the light-passing and receiving paths and the flue gas, and thus improving the accuracy of flue gas monitoring.

[0047] To further improve the accuracy of flue gas monitoring, a pair of light-limiting plates 50 are provided parallel to the inner wall of the dust-blocking cylinder 30 and the laser transceiver 20. The light-limiting plates 50 are vertically arranged to form a light-limiting interlayer 51 between the pair of light-limiting plates 50. The light-limiting interlayer 51 is connected to the light-passing hole 31. The output end 201 and the receiving end 202 are arranged vertically spaced in the light-limiting interlayer 51. The output end 201 points to any one of the light-limiting plates 50 so that the light path can be reflected in the light-limiting interlayer 51.

[0048] By using the above settings, a pair of parallel light-limiting plates 50 are used to reflect the light-receiving and light-emitting paths multiple times, thereby further increasing the complexity and area of ​​the region enclosed by the light in the light-receiving and light-emitting paths, thereby further increasing the area and frequency of interaction between the light-receiving and light-emitting paths and the flue gas, and thus further improving the accuracy of flue gas monitoring.

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A linear-beam optical smoke fire detector, characterized in that, include: Smoke collection duct (10), the smoke collection duct (10) is set vertically and connected to the external environment, the bottom of the smoke collection duct (10) is open to collect the rising smoke, and the inner wall of the smoke collection duct (10) is covered with a reflective layer (11); A laser transceiver (20) is coaxially disposed inside the smoke collection tube (10). The laser transceiver (20) is connected to a motor (21). The motor (21) is fixedly connected to the smoke collection tube (10) so that the laser transceiver (20) can rotate horizontally inside the smoke collection tube (10). The side wall of the laser transceiver (20) is provided with an output end (201) and a receiving end (202). The laser emitted from the output end (201) is reflected by the reflective layer (11) and then enters the receiving end (202). A dustproof tube (30) is coaxially fitted between the laser transceiver (20) and the smoke collection tube (10) and connected to the laser transceiver (20). The dustproof tube (30) has a light-passing hole (31) that matches the optical path of the laser transceiver (20). The outer wall of the dustproof tube (30) is provided with several brushes (32) that are attached to the surface of the reflective layer (11).

2. A linear beam smoke fire detector according to claim 1, wherein, The outer diameter of the dust-blocking cylinder (30) is slightly smaller than the inner diameter of the smoke-collecting cylinder (10) so as to form a dust-collecting cavity (33) between the dust-blocking cylinder (30) and the smoke-collecting cylinder (10); The bottom of the smoke collection duct (10) is detachably connected to a dust collection ring (12), and the top of the dust collection ring (12) has an annular dust collection groove (121). The dust collection groove (121) is aligned with the dust collection chamber (33) and located directly below the dust collection chamber (33).

3. A linear beam smoke fire detector according to claim 2, wherein, The brush (32) is a vertically arranged strip, and the length of the brush (32) matches the height of the reflective layer (11); The brush (32) is provided in multiple ways, and all the brushes (32) are arranged in a ring at uniform intervals on the outer wall of the dustproof cylinder (30).

4. The linear beam smoke detector according to claim 3, characterized in that, The dust collection ring (12) has an installation groove (122) at the top, and the dust collection groove (121) is located at the bottom of the installation groove (122). The outer wall of the installation groove (122) is threadedly connected to the outer wall of the smoke collection cylinder (10), and the inner wall of the installation groove (122) is in contact with the inner wall of the dust baffle cylinder (30) so that the dust collection chamber (33) and the dust collection groove (121) are sealed and connected.

5. The linear beam smoke detector according to claim 4, characterized in that, The inner wall of the mounting groove (122) is provided with a number of balls, which contact the inner wall of the dustproof cylinder (30) through the balls.

6. The linear beam smoke detector according to claim 5, characterized in that, The inner ring of the dust collection ring (12) is provided with a filter screen (13), and the diameter of the filter screen (13) matches the inner diameter of the dust collection ring (12).

7. The linear beam smoke detector according to claim 6, characterized in that, The laser transceiver (20) is connected to a rotating shaft (40) at its bottom. The rotating shaft (40) is coaxially arranged with the smoke collection tube (10). The bottom end of the rotating shaft (40) is connected to several brush arms (41). The brush arms (41) are arranged horizontally. The bottom surface of the brush arms (41) is provided with bristles (411). The bristles (411) are in contact with the top surface of the filter screen (13).

8. The linear beam smoke detector according to claim 7, characterized in that, The bottom of the laser transceiver (20) is convex in a spherical or conical shape.

9. The linear beam smoke detector according to claim 1, characterized in that, The light-passing aperture (31) is configured as a strip-shaped aperture extending in the vertical direction, and the output end (201) and the receiving end (202) are spaced apart in the vertical direction.

10. The linear beam smoke detector according to claim 9, characterized in that, A pair of light-limiting plates (50) are provided parallel to the inner wall of the dust-proof cylinder (30) and the laser transceiver (20). The light-limiting plates (50) are vertically arranged to form a light-limiting interlayer (51) between the pair of light-limiting plates (50). The light-limiting interlayer (51) is connected to the light-passing hole (31). The output end (201) and the receiving end (202) are arranged vertically in the light-limiting interlayer (51); The output terminal (201) points to any of the light-limiting plates (50) so that the light path can be reflected in the light-limiting interlayer (51).

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