Intelligent building security monitoring device and monitoring method

By designing adjustable fixed components and protective components in the intelligent building security monitoring device, the problem of inconvenient adjustment of the installation distance of existing smoke alarms is solved, the detection sensitivity and monitoring performance are improved, and the service life of the equipment is increased.

CN119957797AInactive Publication Date: 2025-05-09HUBEI HUAHENG TIANJIU CONSTR ENG CO LTD
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Patent Information

Application Number
CN202411309456.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-19
Publication Date
2025-05-09
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The fixed base distance of the existing smoke alarm safety alarm system can only be adjusted by different brands and models, resulting in too high or too low installation distance, affecting detection sensitivity.

Method used

An intelligent building security monitoring device is designed, including a smoke alarm body. The top of the smoke alarm body is equipped with a fixed component for easy fixing and adjustment, and a protective component is installed at the bottom to reduce the entry of dust or water vapor. By adjusting the distance between the bottom rod and the top rod, and preventing excessive adjustment through the limit block, sensitive adjustment is achieved.

Benefits of technology

Through the design of this device, the monitoring body can be quickly fixed and disassembled, and the protective components can be adjusted according to different environments, improving the sensitivity and monitoring performance of smoke detection, and extending the service life of the equipment.

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Abstract

The invention discloses an intelligent building security monitoring device and monitoring method, and the device comprises a smoke alarm machine body which comprises a monitoring machine body for monitoring smoke, a control switch which is electrically connected with the monitoring machine body for control, and reminding sound channels which are symmetrically disposed at two ends of the monitoring machine body and are used for giving out alarm sound. According to the installation site, the distance between the adjusting bottom rod and the adjusting top rod is adjusted, meanwhile, the distance between the adjusting bottom rod and the adjusting top rod can be limited through the limiting top block and the limiting bottom block, excessive adjustment is prevented, then a fixing ring is rotated to fix the adjusting bottom rod and the adjusting top rod in a threaded mode, and the adjustment effect is improved. Through the fixing assembly, a worker can conveniently adjust the distance between the adjusting bottom rod and the adjusting top rod according to a working place, the situation that the sensitivity of the smoke alarm machine body to smoke detection is reduced due to the height is reduced, and the monitoring performance of the smoke alarm machine body to a building is improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of intelligent building security monitoring equipment, in particular to an intelligent building security monitoring device and a monitoring method. Background Art

[0002] Smart building security monitoring devices are equipment that use advanced sensors, cameras, network communication technology, artificial intelligence and other technologies to monitor, identify and manage buildings in real time. These devices can improve the safety, management efficiency and convenience of buildings, and play a great role in preventing crimes, monitoring personnel activities, and emergency response. Smart building security monitoring devices include access control systems, security alarm systems, and electronic patrol systems.

[0003] The safety alarm system can monitor the surrounding environment in real time. Once an abnormal situation is detected, it can immediately sound an alarm to remind the user to take timely measures. The distance of the fixed base of the existing smoke alarm safety alarm system can only be adjusted according to different brands and models. Too high or too low installation distance will affect the sensitivity of detection. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing security alarm system can monitor the surrounding environment in real time. Once an abnormal situation is found, an alarm can be immediately issued to remind the user to take timely measures. The distance of the fixed base of the existing smoke alarm safety alarm system can only be adjusted according to different brands and models. Too high or too low installation distance will affect the sensitivity of detection. Provided is an intelligent building security monitoring device and monitoring method.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intelligent building security monitoring device and a monitoring method, comprising a smoke alarm body, the smoke alarm body comprising a monitoring body for monitoring smoke, a control switch electrically connected to the monitoring body for control, and a reminder sound channel symmetrically arranged at both ends of the monitoring body for emitting an alarm sound, a protective outer ring for protecting a smoke detection component is arranged at the bottom of the monitoring body, and smoke inlets for smoke to enter are evenly opened on the outer periphery of the protective outer ring, a fixing component for easy fixing and adjustment is arranged at the top of the smoke alarm body, and a protective component for reducing external dust or water vapor from entering the smoke inlet is arranged at the bottom of the smoke alarm body and located inside the protective outer ring;

[0006] The fixing assembly comprises a fixing base which is fixedly connected with the smoke alarm body, an adjusting bottom rod is evenly arranged around the top of the fixing base, and an adjusting top rod is slidably connected with the adjusting bottom rod, and a fixing top seat is fixedly connected with the top of the adjusting top rod.

[0007] As a further solution of the present invention: the outer periphery of the adjusting bottom rod is rotatably connected with a fixing ring which is threadedly fixed to the adjusting top rod, and the outer periphery of the adjusting top rod is provided with a threaded end which is threadedly fixed to the fixing ring.

[0008] As a further solution of the present invention: the top end of the adjusting bottom rod is fixedly connected with a limiting top block which is slidably limited with the adjusting top rod, and the bottom end of the adjusting top rod is provided with a limiting bottom block which is slidably limited with the adjusting bottom rod.

[0009] As a further solution of the present invention: the protective component includes a dust isolation component, the dust isolation component includes a dust isolation ring, the outer circumference of the dust isolation ring is evenly surrounded by dust isolation mesh openings to prevent dust from entering, the inner side of the protective outer ring is symmetrically fixed with a rotating round rod rotatably connected to the dust isolation ring, and the outer circumference of the dust isolation ring is symmetrically provided with a rotating circular groove matched with the rotating round rod.

[0010] As a further solution of the present invention: the protection component also includes an activated carbon filter component, which includes an activated carbon filter ring rotatably connected to the inside of the dust isolation component and activated carbon filter mesh openings evenly arranged around the outer circumference of the activated carbon filter ring, and two rotating circular grooves symmetrically arranged on the outer circumference of the activated carbon filter ring rotatably connected to the dust isolation ring, and two rotating round rods matching the two rotating circular grooves are fixed at the inner end of the dust isolation ring.

[0011] As a further solution of the present invention: the dust isolation component and the activated carbon filter component are both made of elastic rubber material.

[0012] As a further solution of the present invention: the monitoring body and the fixed base are fixed by a locking assembly, and the locking assembly includes a T-slot opened at the bottom end of the fixed base and a T-shaped block fixed to the T-slot, the T-slots are evenly opened at the bottom end of the fixed base, and the T-shaped blocks are evenly fixed to the top of the monitoring body.

[0013] As a further solution of the present invention: the T-shaped clamping block includes a fixed block and a locking block sliding inside the fixed block, and a return spring fixedly connected to the locking block is fixed inside the fixed block, and a locking groove is opened at one end of the T-shaped slot to be locked and fixed with the locking block.

[0014] A monitoring method of an intelligent building security monitoring device comprises the following steps:

[0015] S: Press the locking block into the fixed block, and then insert the T-shaped card block into the T-shaped slot. When the locking block and the locking slot are connected, the locking block is ejected from the locking slot by the stress of the reset spring inside the fixed block, completing the quick fixation of the monitoring body and the fixed base;

[0016] S: The dust isolation component is sleeved into the inner part of the protective outer ring by rotating the circular groove 1 and the circular rod 1, and then the activated carbon filter component is sleeved into the inner part of the dust isolation component by rotating the circular groove 2 and the circular rod 2. The dust isolation component or the activated carbon filter component is rotated according to the air conditions of the use site to protect the smoke detection component;

[0017] S: According to the installation location, adjust the distance between the adjusting bottom rod and the adjusting top rod. At the same time, the distance between the adjusting bottom rod and the adjusting top rod can be limited by the limiting top block and the limiting bottom block to prevent over-adjustment. Then rotate the fixing ring to thread the adjusting bottom rod and the adjusting top rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention presses the locking block into the interior of the fixing block by pressing it, and then inserts the T-shaped card block into the T-shaped slot. At this time, when the locking block is connected to the locking slot, the stress of the reset spring inside the fixing block pops the locking block out of the locking slot, completing the rapid fixation of the monitoring body and the fixed base. The locking assembly can facilitate the staff to quickly lock the monitoring body with the fixed base, and the reverse operation can be quickly disassembled, thereby increasing the convenience of disassembly and assembly of the smoke alarm body;

[0020] 2. The dust isolation component is sleeved into the inner part of the protective outer ring by rotating the circular groove 1 and the rotating circular rod 1, and then the activated carbon filter component is sleeved into the inner part of the dust isolation component by rotating the circular groove 2 and the rotating circular rod 2. The dust isolation component or the activated carbon filter component is rotated according to the air conditions of the use site to protect the smoke detection component. The dust isolation component or the activated carbon filter component can be rotated according to the different work sites through the protective component, so that the dust isolation mesh port or the activated carbon filter mesh port can block the dust or humid water vapor in the air, reduce the dust or water vapor in the air from entering the smoke detection component, increase the service life of the smoke detection component, and increase the detection sensitivity of the smoke detection component;

[0021] 3. According to the installation location, the distance between the adjusting bottom rod and the adjusting top rod is adjusted. At the same time, the distance between the adjusting bottom rod and the adjusting top rod can be limited by the limiting top block and the limiting bottom block to prevent over-adjustment. Then, the fixing ring is rotated to thread the adjusting bottom rod and the adjusting top rod. The fixing assembly can facilitate the staff to adjust the distance between the adjusting bottom rod and the adjusting top rod according to the work location, reduce the sensitivity of the smoke alarm body to smoke detection due to height, and increase the monitoring performance of the smoke alarm body on the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the explosion structure of the smoke alarm body of the present invention;

[0024] Figure 3 It is a schematic cross-sectional structure diagram of the fixing assembly of the present invention;

[0025] Figure 4 It is a schematic diagram of the expanded structure of the smoke alarm body of the present invention;

[0026] Figure 5 It is a schematic diagram of the cross-sectional structure of the smoke alarm body of the present invention;

[0027] Figure 6 The present invention Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0028] In the figure: 1. Smoke alarm body; 11. Monitoring body; 12. Control switch; 13. Reminder channel; 14. Smoke detection component; 15. Protective outer ring; 16. Smoke inlet; 17. Rotating round rod one; 2. Fixing component; 21. Fixed base; 22. Adjusting bottom rod; 23. Adjusting top rod; 24. Fixing ring; 25. Limiting top block; 26. Limiting bottom block; 27. Fixed top seat; 28. Threaded end; 3. Protective component; 4. Dust isolation component; 41. Dust isolation ring; 42. Dust isolation net port; 43. Rotating round groove one; 44. Rotating round rod two; 5. Activated carbon filter component; 51. Activated carbon filter ring; 52. Activated carbon filter net port; 53. Rotating round groove two; 6. Locking component; 61. T-type block; 611. Fixing block; 612. Reset spring; 613. Locking block; 62. T-type slot; 63. Locking slot. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0031] Reference Figures 1 to 6 In an embodiment of the present invention, an intelligent building security monitoring device and a monitoring method include a smoke alarm body 1, the smoke alarm body 1 includes a monitoring body 11 for monitoring smoke, a control switch 12 electrically connected to the monitoring body 11 for control, and a reminder sound channel 13 symmetrically arranged at both ends of the monitoring body 11 for emitting an alarm sound, a protective outer ring 15 for protecting a smoke detection component 14 is arranged at the bottom of the monitoring body 11, and smoke inlets 16 for smoke to enter are evenly opened on the outer periphery of the protective outer ring 15, a fixing component 2 for easy fixing and adjustment is arranged at the top of the smoke alarm body 1, and a protective component 3 for reducing external dust or water vapor from entering the smoke inlet 16 is arranged at the bottom of the smoke alarm body 1 and located inside the protective outer ring 15;

[0032] The fixing assembly 2 includes a fixing base 21 which is fixedly connected to the smoke alarm body 1. An adjusting bottom rod 22 is evenly arranged around the top of the fixing base 21. An adjusting top rod 23 is slidably connected to the adjusting bottom rod 22. A fixing top seat 27 is fixedly connected to the top of the adjusting top rod 23.

[0033] Reference Figures 1 to 3 The outer periphery of the adjusting bottom rod 22 is rotatably connected with a fixing ring 24 threadedly fixed with the adjusting top rod 23, and the outer periphery of the adjusting top rod 23 is provided with a threaded end 28 threadedly fixed with the fixing ring 24, the top end of the adjusting bottom rod 22 is fixedly connected with a limiting top block 25 for sliding limit with the adjusting top rod 23, and the bottom end of the adjusting top rod 23 is provided with a limiting bottom block 26 for sliding limit with the adjusting bottom rod 22;

[0034] By adopting the above scheme, the adjusting bottom rod 22 and the adjusting top rod 23 can be fixed by the fixing ring 24, and at the same time, the limiting top block 25 and the limiting bottom block 26 can prevent the adjusting bottom rod 22 and the adjusting top rod 23 from being over-adjusted, so that the adjusting distance between the adjusting bottom rod 22 and the adjusting top rod 23 can be easily controlled.

[0035] Reference Figure 4 The protective component 3 includes a dust isolation component 4, which includes a dust isolation ring 41. A dust isolation mesh port 42 is evenly arranged around the outer circumference of the dust isolation ring 41 to prevent dust from entering. A rotating round rod 17 rotatably connected to the dust isolation ring 41 is symmetrically fixed on the inner side of the protective outer ring 15, and a rotating circular groove 43 matched with the rotating circular rod 17 is symmetrically arranged on the outer circumference of the dust isolation ring 41. The protective component 3 also includes an activated carbon filter component 5. The activated carbon filter component 5 includes an activated carbon filter ring 51 rotatably connected to the inside of the dust isolation component 4 and an activated carbon filter mesh port 52 evenly arranged around the outer circumference of the activated carbon filter ring 51. A rotating circular groove 2 53 rotatably connected to the dust isolation ring 41 is symmetrically arranged on the outer circumference of the activated carbon filter ring 51. A rotating circular groove 2 53 rotatably connected to the dust isolation ring 41 is symmetrically arranged on the outer circumference of the activated carbon filter ring 51. A rotating circular rod 2 44 matched with the rotating circular groove 2 53 is fixed on the inner end of the dust isolation ring 41. The dust isolation component 4 and the activated carbon filter component 5 are both made of elastic rubber material.

[0036] By adopting the above scheme: the dust isolation component 4 or the activated carbon filter component 5 can be rotated according to different work locations through the protection component 3, so that the dust isolation mesh port 42 or the activated carbon filter mesh port 52 can block the dust or humid water vapor in the air, reduce the dust or water vapor in the air entering the smoke detection component 14, increase the service life of the smoke detection component 14, and increase the detection sensitivity of the smoke detection component 14.

[0037] Reference Figure 5 and Figure 6 The monitoring body 11 and the fixed base 21 are fixed by a locking assembly 6. The locking assembly 6 includes a T-slot 62 opened at the bottom end of the fixed base 21 and a T-block 61 fixed with the T-slot 62. The T-slot 62 is evenly opened at the bottom end of the fixed base 21. The T-block 61 is evenly fixed at the top of the monitoring body 11. The T-block 61 includes a fixed block 611 and a locking block 613 sliding inside the fixed block 611. A return spring 612 fixedly connected to the locking block 613 is fixed inside the fixed block 611. A locking slot 63 is opened at one end of the T-slot 62 and locked with the locking block 613.

[0038] By adopting the above solution, the locking assembly 6 can facilitate the staff to quickly lock the monitoring body 11 with the fixed base 21, and the reverse operation can be quickly disassembled, thereby increasing the convenience of disassembly and assembly of the smoke alarm body 1.

[0039] A monitoring method of an intelligent building security monitoring device comprises the following steps:

[0040] S1: Press the locking block 613 to push it into the fixing block 611, and then insert the T-shaped card block 61 into the T-shaped slot 62. At this time, when the locking block 613 is connected with the locking slot 63, the locking block 613 is ejected from the locking slot 63 by the stress of the return spring 612 inside the fixing block 611, and the monitoring body 11 and the fixing base 21 are quickly fixed. The locking assembly 6 can facilitate the staff to quickly lock the monitoring body 11 with the fixing base 21, and the reverse operation can be quickly disassembled, thereby increasing the convenience of disassembly and assembly of the smoke alarm body 1;

[0041] S2: The dust isolation component 4 is sleeved into the inner part of the protective outer ring 15 by rotating the circular groove 1 43 and the rotating circular rod 1 17, and then the activated carbon filter component 5 is sleeved into the inner part of the dust isolation component 4 by rotating the circular groove 2 53 and the rotating circular rod 2 44. The dust isolation component 4 or the activated carbon filter component 5 is rotated according to the air conditions of the use site to protect the smoke detection component 14. The dust isolation component 4 or the activated carbon filter component 5 can be rotated according to the different work sites through the protection component 3, so that the dust isolation mesh port 42 or the activated carbon filter mesh port 52 can block the dust or humid water vapor in the air, reduce the dust or water vapor in the air from entering the smoke detection component 14, increase the service life of the smoke detection component 14, and increase the detection sensitivity of the smoke detection component 14;

[0042] S3: According to the installation location, the distance between the adjusting bottom rod 22 and the adjusting top rod 23 is adjusted. At the same time, the distance between the adjusting bottom rod 22 and the adjusting top rod 23 can be limited by the limiting top block 25 and the limiting bottom block 26 to prevent over-adjustment. Then, the fixing ring 24 is rotated to thread the adjusting bottom rod 22 and the adjusting top rod 23. The fixing component 2 can facilitate the staff to adjust the distance between the adjusting bottom rod 22 and the adjusting top rod 23 according to the work location, reduce the sensitivity of the smoke alarm body 1 to smoke detection due to height, and increase the monitoring performance of the smoke alarm body 1 on the building.

[0043] What has been described above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An intelligent building security monitoring device, characterized in that: The smoke alarm body (1) comprises a monitoring body (11) for monitoring smoke, a control switch (12) electrically connected to the monitoring body (11) for control, and a warning sound channel (13) symmetrically arranged at both ends of the monitoring body (11) for emitting an alarm sound, a protective outer ring (15) for protecting a smoke detection component (14) is arranged at the bottom of the monitoring body (11), and smoke inlets (16) for smoke to enter are evenly opened on the outer periphery of the protective outer ring (15), a fixing component (2) for easy fixing and adjustment is arranged at the top of the smoke alarm body (1), and a protective component (3) for reducing external dust or water vapor from entering the smoke inlet (16) is arranged at the bottom of the smoke alarm body (1) and located inside the protective outer ring (15); The fixing assembly (2) comprises a fixing base (21) which is fixedly engaged with the smoke alarm body (1), an adjusting bottom rod (22) is evenly arranged around the top of the fixing base (21), and an adjusting top rod (23) is slidably connected to the adjusting bottom rod (22), and a fixing top seat (27) is fixedly connected to the top of the adjusting top rod (23).

2. The intelligent building security monitoring device according to claim 1, characterized in that: The outer periphery of the adjusting bottom rod (22) is rotatably connected to a fixing ring (24) threadedly fixed to the adjusting top rod (23), and the outer periphery of the adjusting top rod (23) is provided with a threaded end (28) threadedly fixed to the fixing ring (24).

3. The intelligent building security monitoring device according to claim 1, characterized in that: The top end of the adjusting bottom rod (22) is fixedly connected with a limiting top block (25) for sliding position limiting with the adjusting top rod (23), and the bottom end of the adjusting top rod (23) is provided with a limiting bottom block (26) for sliding position limiting with the adjusting bottom rod (22).

4. The intelligent building security monitoring device according to claim 1, characterized in that: The protective component (3) comprises a dust isolation component (4), the dust isolation component (4) comprises a dust isolation ring (41), the outer circumference of the dust isolation ring (41) is evenly surrounded by a dust isolation mesh opening (42) for preventing dust from entering, a rotating round rod (17) symmetrically fixed on the inner side of the protective outer ring (15) and rotatably connected to the dust isolation ring (41), and a rotating circular groove (43) adapted to the rotating round rod (17) is symmetrically provided on the outer circumference of the dust isolation ring (41).

5. The intelligent building security monitoring device according to claim 4, characterized in that: The protection component (3) further comprises an activated carbon filter component (5), the activated carbon filter component (5) comprising an activated carbon filter ring (51) rotatably connected to the inside of the dust isolation component (4) and activated carbon filter mesh openings (52) uniformly arranged around the outer periphery of the activated carbon filter ring (51), the outer periphery of the activated carbon filter ring (51) is symmetrically provided with two rotating circular grooves (53) rotatably connected to the dust isolation ring (41), and the inner end of the dust isolation ring (41) is fixed with two rotating round rods (44) adapted to the two rotating circular grooves (53).

6. The intelligent building security monitoring device according to claim 4, characterized in that: The dust isolation component (4) and the activated carbon filter component (5) are both made of elastic rubber material.

7. The intelligent building security monitoring device according to claim 1, characterized in that: The monitoring body (11) and the fixed base (21) are fixedly connected by a locking assembly (6); the locking assembly (6) comprises a T-shaped slot (62) provided at the bottom end of the fixed base (21) and a T-shaped block (61) fixedly connected to the T-shaped slot (62); the T-shaped slot (62) is evenly provided at the bottom end of the fixed base (21); and the T-shaped block (61) is evenly fixedly arranged at the top end of the monitoring body (11).

8. The intelligent building security monitoring device according to claim 7, characterized in that: The T-shaped clamping block (61) comprises a fixed block (611) and a locking block (613) sliding inside the fixed block (611), and a return spring (612) fixedly connected to the locking block (613) is fixed inside the fixed block (611), and a locking groove (63) locked and fixed to the locking block (613) is formed at one end of the T-shaped groove (62).

9. A monitoring method for an intelligent building security monitoring device according to claims 1-8, characterized in that: The following steps are involved: S1: Press the locking block (613) into the interior of the fixing block (611), and then insert the T-shaped card block (61) into the T-shaped slot (62). At this time, when the locking block (613) and the locking slot (63) are in contact, the locking block (613) is ejected out of the locking slot (63) by the stress of the return spring (612) inside the fixing block (611), thereby completing the rapid fixation of the monitoring body (11) and the fixing base (21); S2: The dust isolation component (4) is sleeved into the interior of the protective outer ring (15) by rotating the circular groove (43) and the circular rod (17), and then the activated carbon filter component (5) is sleeved into the interior of the dust isolation component (4) by rotating the circular groove (53) and the circular rod (44). The dust isolation component (4) or the activated carbon filter component (5) is rotated according to the air conditions at the place of use to protect the smoke detection component (14); S3: According to the installation location, the distance between the adjusting bottom rod (22) and the adjusting top rod (23) is adjusted. At the same time, the distance between the adjusting bottom rod (22) and the adjusting top rod (23) can be limited by the limiting top block (25) and the limiting bottom block (26) to prevent over-adjustment. Then, the fixing ring (24) is rotated to screw the adjusting bottom rod (22) and the adjusting top rod (23) together.