Smoke detection device for fire alarm systems
By employing modular design and mechanical cleaning technology, the problems of difficult maintenance and decreased detection accuracy of traditional smoke detection devices have been solved, achieving efficient self-cleaning and convenient maintenance, and improving response speed and detection accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 上海安孚达智能科技有限公司
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-10
AI Technical Summary
Traditional smoke detection devices suffer from difficult-to-maintain filter components, reduced detection accuracy, and lack of self-cleaning capabilities, resulting in slow response times and high maintenance costs.
The smoke detection device adopts a modular design, combining forced airflow circulation by a fan and mechanical cleaning. The filter screen is cleaned by a rotating brush driven by a drive motor. It can be easily disassembled and assembled by plug-in fitting and threaded fastening. The servo motor drives the filter screen to rotate and remove dust.
It achieves efficient self-cleaning, improves detection accuracy and response speed, reduces maintenance difficulty and cost, and ensures the stability and accuracy of smoke detectors.
Smart Images
Figure CN224480741U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fire protection equipment technology, and in particular to a smoke detection device for a fire alarm system. Background Technology
[0002] Smoke detection devices are a core component of fire alarm systems, providing early warning of fires by detecting the concentration of smoke in the environment. Traditional devices typically use fixed sensors that rely on natural airflow for detection, which suffers from slow response times and susceptibility to dust interference. To improve sensitivity, some devices have added fans to force airflow circulation, but after long-term use, dust accumulation on the filter can obstruct airflow, requiring frequent manual cleaning and resulting in high maintenance costs.
[0003] The shortcomings of existing technology are:
[0004] (1) Difficult maintenance of filter components: Traditional filter screens are fixedly installed, and the entire outer shell needs to be disassembled for cleaning, which is cumbersome.
[0005] (2) Decreased detection accuracy: Dust adhering to the sensor surface or filter screen will reduce the airflow rate, leading to false alarms or missed alarms by the detector.
[0006] (3) Simple drive structure: The existing device lacks self-cleaning function and relies on external tools to clean the rotating brush, which is inefficient. Utility Model Content
[0007] In view of the shortcomings of the prior art, this utility model provides a smoke detection device for fire alarm system, which overcomes the shortcomings of the prior art and effectively solves the problems of difficult maintenance of filter components, decrease in detection accuracy over time, and simple drive structure in the prior art.
[0008] To achieve the above objectives, the present invention adopts the following technical solution:
[0009] A smoke detection device for a fire alarm system includes a circular shell. An air inlet pipe and an air outlet pipe are respectively inserted and fixed to both sides of the outer wall of the circular shell, and a fan is installed and fixed inside the air inlet pipe. The circular shell contains, from top to bottom, an installation assembly, a filter assembly, and a drive assembly. The installation assembly includes a circular plate, a smoke detector fixed to the bottom center of the circular plate, an installation plate welded and fixed to one side of the bottom of the circular plate, an installation disc rotatably connected to the outer wall of the installation plate away from the smoke detector, a rotating brush fixed to one side of the installation disc, a rotating ring rotatably connected to the annular outer wall of the circular plate, and positioning blocks welded and fixed to the annular outer wall of the rotating ring at equal intervals. The filter assembly includes a bottom ring, a connecting block welded and fixed to the top of the bottom ring at equal intervals along the annulus, a top ring welded and fixed to the top of the connecting block, and a filter screen welded and fixed between two adjacent connecting blocks. The drive assembly includes a bottom cover, a handle welded and fixed to one side of the bottom of the bottom cover, a rotating disc rotatably connected to the top of the bottom cover, and a plug rod welded and fixed to the top edge of the rotating disc at equal intervals along the annulus.
[0010] During the smoke detection phase, the fan draws ambient air into the cylindrical housing through the intake pipe. The airflow passes through a filter to remove dust before contacting the smoke detector. If smoke is detected, the detector triggers an alarm signal. During the self-cleaning phase, a rotating brush cleans the filter. A timed drive motor periodically starts the brush, scraping away dust from the filter surface. To disassemble the filter assembly, simply unscrew the bottom cover and pull out the positioning block and insert rod. The insertion of the positioning block and top ring prevents filter misalignment, and the tightening of the screw and nut prevents loosening of the components. The entire process, through a combination of airflow circulation, mechanical cleaning, and modular design, achieves a highly efficient and stable fire early warning function.
[0011] Preferably, a mounting bracket is welded to the top of the circular shell, and a mounting hole is provided on the top of the circular shell.
[0012] Preferably, a screw is welded and fixed to the top of the circular plate, and the screw and the mounting hole form an insertion fit, and the mounting component and the circular shell are fastened together by the screw and nut.
[0013] Preferably, a drive motor is fixedly mounted on the outer wall of the mounting plate near the smoke detector, and the output shaft of the drive motor is connected and fixed to one end of the rotating shaft of the mounting plate through a coupling.
[0014] Preferably, the top of the top ring has equidistantly distributed positioning grooves along the circumference, and the positioning grooves and positioning blocks are interlocked.
[0015] Preferably, the bottom ring has slots evenly distributed along the circumference at its bottom, and the slots and the insert rods are engaged in a plug-in fit.
[0016] Preferably, the bottom cover is screwed to the round shell, and a servo motor is installed and fixed at the bottom of the bottom cover. The output shaft of the servo motor is connected and fixed to the connecting shaft at the bottom of the rotating disk through a coupling.
[0017] The beneficial effects of this utility model are as follows:
[0018] 1. It can achieve efficient self-cleaning and convenient maintenance. The drive motor drives the rotating brush to rotate, which automatically removes dust from the surface of the filter screen. The design of the plug and slot allows the filter components to be quickly disassembled and installed. Cleaning can be completed without tools. The servo motor drives the rotating disk to rotate, and the plug links the bottom ring to achieve the rotation of the filter screen for dust removal.
[0019] 2. It can improve detection accuracy and stability. The forced airflow circulation of the fan ensures that the smoke enters the round shell quickly, improving the response speed. The plug-in cooperation between the positioning block and the positioning groove fixes the top ring, avoiding airflow leakage caused by filter displacement. The fastening design of the screw and nut enhances the stability of the installation components and reduces vibration errors in the smoke detector. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of a smoke detection device for a fire alarm system proposed in this utility model;
[0021] Figure 2 This is a schematic diagram of the internal structure of a circular shell of a smoke detection device for a fire alarm system proposed in this utility model;
[0022] Figure 3 This is a schematic diagram of the installation components of a smoke detection device for a fire alarm system proposed in this utility model;
[0023] Figure 4 This is a schematic diagram of the filter assembly structure of a smoke detection device for a fire alarm system proposed in this utility model;
[0024] Figure 5 This is a schematic diagram of the drive component structure of a smoke detection device for a fire alarm system proposed in this utility model.
[0025] In the diagram: 1. Round shell; 2. Inlet pipe; 3. Outlet pipe; 4. Fan; 5. Mounting assembly; 6. Filter assembly; 7. Drive assembly; 8. Round plate; 9. Screw; 10. Smoke detector; 11. Mounting plate; 12. Mounting disc; 13. Drive motor; 14. Rotating brush; 15. Rotating ring; 16. Positioning block; 17. Bottom ring; 18. Connecting block; 19. Top ring; 20. Filter screen; 21. Bottom cover; 22. Handle; 23. Rotating disc; 24. Insert rod; 25. Servo motor. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0027] Example:
[0028] Reference Figure 1-5 A smoke detection device for a fire alarm system includes a circular shell 1. An inlet pipe 2 and an outlet pipe 3 are respectively inserted and fixed to both sides of the outer wall of the circular shell 1. A fan 4 is installed and fixed inside the inlet pipe 2. Inside the circular shell 1, from top to bottom, are arranged an installation assembly 5, a filter assembly 6, and a drive assembly 7. The installation assembly 5 includes a circular plate 8, a smoke detector 10 fixed to the bottom center of the circular plate 8, an installation plate 11 welded and fixed to one side of the bottom of the circular plate 8, an installation disc 12 rotatably connected to the outer wall of the installation plate 11 on the side away from the smoke detector 10, and a rotating brush 14 fixed to one side of the installation disc 12. The filter assembly 6 includes a bottom ring 17, a connecting block 18 welded and fixed to the top of the bottom ring 17 at equal intervals along the ring, a top ring 19 welded and fixed to the top of the connecting block 18, and a filter screen 20 welded and fixed between two adjacent connecting blocks 18. The drive assembly 7 includes a bottom cover 21, a handle 22 welded and fixed to one side of the bottom of the bottom cover 21, a rotating disk 23 rotatably connected to the top of the bottom cover 21, and a plug rod 24 welded and fixed to the top edge of the rotating disk 23 at equal intervals along the ring.
[0029] A mounting bracket is welded to the top of the circular shell 1, and mounting holes are provided on the top of the circular shell 1. The mounting bracket is welded to the top of the circular shell 1 and fixed through the mounting holes. The air inlet pipe 2 and the air outlet pipe 3 form a forced airflow path. The fan 4 has an adjustable speed to adapt to different smoke concentration environments. A screw 9 is welded to the top of the circular plate 8, and the screw 9 forms a plug-in fit with the mounting hole. The mounting assembly 5 is fastened to the circular shell 1 through the screw 9 and the nut. A drive motor 13 is mounted on the outer wall of the mounting plate 11 near the smoke detector 10. The output shaft of the drive motor 13 is connected and fixed to one end of the rotating shaft of the mounting plate 12 through a coupling. The circular plate 8 is fixed to the top of the circular shell 1 through the screw 9. The smoke detector 10 is located in the center to maximize the detection range. The drive motor 13 is a waterproof and dustproof model, and the output shaft is rigidly connected to the mounting plate 12 through a coupling to ensure stable rotation speed of the rotating brush 14.
[0030] The top ring 19 has equidistantly distributed positioning grooves along its circumference, which interlock with the positioning block 16. The bottom ring 17 has equidistantly distributed slots along its circumference, which interlock with the insertion rod 24. The filter screen 20 is made of stainless steel with a mesh diameter of 0.5mm, balancing air permeability and filtration efficiency. The connecting block 18 is 30mm high to ensure even airflow distribution. The bottom cover 21 is screwed to the round shell 1. A servo motor 25 is fixedly mounted on the bottom of the bottom cover 21. The output shaft of the servo motor 25 is connected and fixed to the connecting shaft at the bottom of the rotating disk 23 via a coupling. The bottom cover 21 is threaded to the round shell 1 and fitted with a sealing ring to prevent air leakage. The servo motor 25 starts every hour, rotating the rotating disk 23 by 30°, thus changing the filtration position of the filter screen 20.
[0031] Working principle:
[0032] During operation, in the smoke detection phase, the fan 4 draws ambient air into the cylindrical shell 1 through the intake pipe 2. The airflow passes through the filter screen 20 to remove dust before contacting the smoke detector 10. If smoke is detected, the detector 10 triggers an alarm signal. In the self-cleaning phase, the rotating brush cleans the filter screen 20. The drive motor 13 starts periodically, driving the rotating brush 14 to scrape off the dust adhering to the surface of the filter screen 20. When unscrewing the bottom cover 21 and disassembling the filter assembly 6, only the positioning block 16 and the insertion rod 24 need to be pulled out. The insertion of the positioning block 16 and the top ring 19 prevents the filter screen 20 from shifting, and the tightening of the screw 9 and the nut prevents the installation assembly 5 from loosening. The entire process, through the combination of airflow circulation, mechanical cleaning, and modular design, achieves a highly efficient and stable fire early warning function.
[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A smoke detection device for a fire alarm system, comprising a circular shell (1), characterized in that, An air inlet pipe (2) and an air outlet pipe (3) are respectively inserted and fixed on both sides of the outer wall of the circular shell (1), and a fan (4) is installed and fixed inside the air inlet pipe (2). The circular shell (1) is arranged from top to bottom as follows: an installation assembly (5), a filter assembly (6), and a drive assembly (7). The installation assembly (5) includes a circular plate (8), a smoke detector (10) installed and fixed at the bottom center of the circular plate (8), an installation plate (11) welded and fixed to one side of the bottom of the circular plate (8), an installation disk (12) rotatably connected to the outer wall of the installation plate (11) away from the smoke detector (10), a rotating brush (14) installed and fixed to one side of the installation disk (12), and a ring rotatably connected to the circular plate (8). The filter assembly (6) includes a bottom ring (17), a connecting block (18) welded and fixed to the top of the bottom ring (17) at equal intervals along the ring, a top ring (19) welded and fixed to the top of the connecting block (18), and a filter screen (20) welded and fixed between two adjacent connecting blocks (18). The drive assembly (7) includes a bottom cover (21), a handle (22) welded and fixed to one side of the bottom of the bottom cover (21), a rotating disk (23) rotatably connected to the top of the bottom cover (21), and a plug rod (24) welded and fixed to the top edge of the rotating disk (23) at equal intervals along the ring.
2. The smoke detection device for a fire alarm system according to claim 1, characterized in that, The top of the circular shell (1) is welded and fixed with a mounting bracket, and the top of the circular shell (1) is provided with a mounting hole.
3. The smoke detection device for a fire alarm system according to claim 1, characterized in that, A screw (9) is welded and fixed to the top of the circular plate (8), and the screw (9) and the mounting hole form an insertion fit. The mounting component (5) and the circular shell (1) are fastened together by the screw (9) and the nut.
4. A smoke detection device for a fire alarm system according to claim 1, characterized in that, A drive motor (13) is fixedly mounted on the outer wall of the mounting plate (11) near the smoke detector (10), and the output shaft of the drive motor (13) is connected and fixed to one end of the rotating shaft of the mounting plate (12) through a coupling.
5. A smoke detection device for a fire alarm system according to claim 1, characterized in that, The top ring (19) has equidistant positioning grooves along the circumference, and the positioning grooves and positioning blocks (16) are interlocked.
6. A smoke detection device for a fire alarm system according to claim 1, characterized in that, The bottom ring (17) has slots that are evenly distributed along the circumference at its bottom, and the slots and the insert rod (24) are connected in a plug-in fit.
7. A smoke detection device for a fire alarm system according to claim 1, characterized in that, The bottom cover (21) is screwed to the round shell (1), and a servo motor (25) is installed and fixed at the bottom of the bottom cover (21). The output shaft of the servo motor (25) is connected and fixed to the connecting shaft at the bottom of the rotating disk (23) through a coupling.