Air-breathing smoke-sensing fire detector based on airflow adjusting device

Abstract

The air-breathing smoke-sensing fire detector based on the airflow adjusting device comprises a shell, a smoke sensor, a main board and an air suction pump, a fixing plate is arranged in an opening of the shell, a plurality of air inlets are formed in the outer ring face of the shell, a concentration pipe is installed at the end, away from the opening, of the shell, a positioning ring is installed in the concentration pipe, and the smoke sensor is arranged on the smoke sensor. A plurality of positioning grooves are formed in one end face of the positioning ring, the two ends of the main board are inserted into the positioning grooves, the smoke sensor is installed on the main board, one end of the air suction pump is inserted into an opening in the end, away from the shell, of the concentration pipe and is in threaded connection with the concentration pipe, and a plurality of ejector rods are installed at one end of the air suction pump. Pressing rings are placed at the ends, away from the air suction pump, of the positioning rods. According to the utility model, the structure is simple, the intensity of the air flow can be adjusted according to the detected quantity so as to increase the detection quality, and the shell and the fixed plate can be detached, so that the detection and replacement of the shell, the getter pump and the mainboard are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of smoke sensor technology, specifically to an aspirating smoke fire detector based on an airflow regulation device. Background Technology

[0002] Smoke detection devices play a crucial role in early fire prevention. Most are installed on ceilings and other similar locations, detecting smoke in the air to determine the presence of a fire. Their principle involves using photoelectric elements to highly sensitively capture the scattered light caused by smoke, and then using control circuitry to issue a fire warning. However, most existing smoke detection devices are passive, only able to passively receive smoke as it slowly spreads to their surroundings. Due to environmental limitations, by the time smoke reaches the detection device, the fire is already out of control.

[0003] Early-stage air sampling smoke detectors utilize a sampling pump structure, working in conjunction with integrated circuits and air sampling tubing, to extract air samples and actively detect the presence of smoke particles. Traditional early-stage air sampling smoke detectors are monolithic structures, with the detection chamber connected to the sampling tubing often integrated with the integrated circuit and sampling pump. This not only results in high replacement and maintenance costs but also lacks flexibility and hinders subsequent disassembly. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an aspirating smoke detector based on an airflow regulation device, which is detachable and easy to replace, so as to solve the problems mentioned in the background art.

[0005] This utility model is achieved through the following technical solution: A suction-type smoke detector based on an airflow regulation device includes a housing, a smoke sensor, a main board, and a suction pump. A fixing plate is provided in the opening of the housing, and multiple air inlets are provided on the outer surface of the housing. A central tube is installed at the end of the housing away from the opening. A positioning ring is installed inside the central tube, and multiple positioning grooves are provided on one end face of the positioning ring. Both ends of the main board are inserted into the positioning grooves. The smoke sensor is installed on the main board. One end of the suction pump is inserted into the opening at the end of the central tube away from the housing and is threadedly connected to the central tube. Multiple top rods are installed at one end of the suction pump. A pressure ring is placed at the end of the multiple positioning rods away from the suction pump, and the pressure ring is set to abut against the bottom surface of the main board.

[0006] As a preferred technical solution, one end of the central pipe is provided with a wiring groove, and the outside of the suction pump is fitted with a ring body. A sealing plate is installed on the ring body opposite the wiring groove. The other end of the sealing plate is inserted into the wiring groove and is provided with an arc-shaped groove. The arc-shaped groove and the wiring groove are combined to form a wiring channel. An annular groove is provided on the inner ring surface of the ring body. A limit ring is installed on the outer wall surface of the suction pump opposite the annular groove. The limit ring is movably set in the annular groove.

[0007] As a preferred technical solution, a connecting part is formed by protrusion on the inner side of the fixing plate. The connecting part is inserted into the opening of the housing and is threadedly connected to the housing. Multiple fixing holes are provided on the outer ring of the fixing plate.

[0008] As a preferred technical solution, a filter screen is installed in the air intake.

[0009] As a preferred technical solution, a microcontroller is installed on the motherboard, and the suction pump is controlled by the microcontroller settings.

[0010] As a preferred technical solution, the suction pump is an adjustable speed suction pump.

[0011] As a preferred technical solution, the smoke sensor is a photoelectric smoke sensor.

[0012] As a preferred technical solution, ventilation channels are formed between the motherboard and the positioning ring, as well as between the motherboard and the crusher.

[0013] The beneficial effects of this utility model are: This utility model has a simple structure. It can draw in external air through the air pump, which enters the central tube through the air inlet and contacts the smoke sensor. The airflow intensity can be adjusted according to the detected amount to increase the detection quality. The housing and fixing plate can be disassembled, and the air pump can also be removed from the central tube. After the air pump is removed, the internal main board can be removed, which facilitates the inspection and replacement of the housing, air pump and main board. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of this utility model after the fixing plate is removed;

[0017] Figure 3This is a schematic diagram of the structure of this utility model after removing the suction pump;

[0018] Figure 4 This is a schematic diagram of the structure of this utility model after removing the shell and the central tube.

[0019] The components are as follows: 1. Housing; 2. Central pipe; 3. Suction pump; 4. Ring body; 5. Sealing plate; 6. Wiring channel; 7. Fixing plate; 8. Filter screen; 9. Air inlet; 10. Smoke sensor; 11. Positioning ring; 12. Pressure ring; 13. Main board; 14. Wiring groove; 15. Connecting part; 16. Top rod. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0022] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model discloses an aspirating smoke detector based on an airflow regulation device, comprising a housing 1, a smoke sensor 10, a main board 13, and an aspirating pump 3. A fixing plate 7 is provided in the opening of the housing 1, and multiple air inlets 9 are provided on the outer surface of the housing 1. A central tube 2 is installed at the end of the housing 1 away from the opening, and a positioning ring 11 is installed inside the central tube 2. Multiple positioning grooves are provided on one end face of the positioning ring 11. Both ends of the main board 13 are inserted into the positioning grooves. The smoke sensor 10 is installed on the main board 13. One end of the aspirating pump 3 is inserted into the opening of the central tube 2 away from the housing 1 and is threadedly connected to the central tube 2. Multiple top rods 16 are installed at one end of the aspirating pump 3, and pressure rings 12 are placed at the ends of the multiple positioning rods away from the aspirating pump 3, which are pressed against the bottom surface of the main board 13.

[0024] In this embodiment, one end of the central pipe 2 is provided with a wiring groove 14, and the air pump 3 is fitted with an outer ring 4. A sealing plate 5 is installed on the ring 4 opposite the wiring groove 14. The other end of the sealing plate 5 is inserted into the wiring groove 14 and is provided with an arc-shaped groove. The arc-shaped groove and the wiring groove 14 are combined to form a wiring channel 6. An annular groove is provided on the inner ring surface of the ring 4. A limit ring is installed on the outer wall surface of the air pump 3 opposite the annular groove. The limit ring is movably set in the annular groove. When the air pump rotates, it will not drive the ring, so that the air pump can rotate independently and the sealing plate can be smoothly inserted into the wiring groove. The wires connected to the main board extend through the wiring channel to the outside and are connected to the air pump. They can also be connected to an audible and visual alarm and a power supply.

[0025] In this embodiment, a connecting part 15 protrudes from the inner side of the fixing plate 7. The connecting part 15 is inserted into the opening of the housing 1 and is threadedly connected to the housing 1. The outer ring of the fixing plate 7 is provided with multiple fixing holes. Screws can pass through the fixing holes to fix the fixing plate on any plane. The threaded connection facilitates the disassembly of the housing.

[0026] In this embodiment, each air inlet 9 is equipped with a filter screen 8, which can intercept impurities in the air and prevent impurities from entering.

[0027] In this embodiment, a microcontroller is installed on the motherboard 13, and the suction pump 3 is controlled by the microcontroller and is used to process the output signal of the smoke sensor.

[0028] In this embodiment, the suction pump 3 is an adjustable-speed suction pump 3. This type of suction pump can adjust its speed by changing the input voltage or PWM (pulse width modulation) signal, thereby controlling the suction intensity. It has the advantages of small size, low noise, and high efficiency, making it suitable for use in smoke detection systems.

[0029] In this embodiment, the smoke sensor 10 is a photoelectric smoke sensor 10. The photoelectric smoke sensor uses the principle of light scattering by smoke to detect smoke. When smoke particles enter the optical chamber inside the sensor, they scatter light, and the sensor converts the light signal into an electrical signal output. This type of sensor also has good detection capability for tiny smoke particles and can detect the presence of even a trace of smoke in a timely manner.

[0030] In this embodiment, ventilation channels are formed between the main board 13 and the positioning ring 11, as well as between the main board 13 and the crusher, so that air can be drawn out from the suction pump through the ventilation channels.

[0031] When the suction pump is started, the suction force generated by the suction pump can draw outside air into the housing through the air inlet and concentrate it into the central tube. The incoming air can come into contact with the smoke sensor to detect whether it contains smoke.

[0032] First, a smoke concentration threshold is set. When the signal value output by the smoke sensor does not exceed this threshold, but a certain amount of smoke is detected, the signal is transmitted to the microcontroller. The microcontroller immediately outputs a larger control signal to the suction pump, increasing the pump's speed and suction strength. At this time, more airflow passes through the smoke sensor, allowing the sensor to more accurately detect whether the airflow still carries the specified smoke concentration. If the smoke concentration continues to rise or remain at a high level for a period of time (e.g., a few seconds), an audible and visual alarm is immediately triggered.

[0033] When the smoke concentration falls below the threshold again, the microcontroller gradually reduces the control signal to the suction pump, causing the suction pump speed to gradually decrease and return to normal low suction operation, thus avoiding energy waste.

[0034] During subsequent disassembly, the connection part can be directly unscrewed from the housing to complete the separation between the housing and the fixing plate. The suction pump can be rotated out of the central tube. As the suction pump descends, it can simultaneously drive the top rod and the sealing plate, allowing the sealing plate to be moved out of the wiring groove. After the sealing plate is no longer obstructed, the guide connected to the main board can be taken out along the wiring groove. After the top rod is no longer obstructed, the pressure plate can be moved out of the central tube, and the main board can also be directly taken out along the central tube, which facilitates the inspection and replacement of the housing, suction pump and main board.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A gas stream modulation device based aspirating smoke fire detector, characterized by: The device includes a housing (1), a smoke sensor (10), a main board (13), and an air pump (3). The housing (1) has a fixing plate (7) in its opening and multiple air inlets (9) on its outer surface. A central tube (2) is installed at the end of the housing (1) away from the opening. A positioning ring (11) is installed inside the central tube (2). Multiple positioning grooves are provided on one end of the positioning ring (11). Both ends of the main board (13) are inserted into the positioning grooves. The smoke sensor (10) is installed on the main board (13). One end of the air pump (3) is inserted into the opening at the end of the central tube (2) away from the housing (1) and is threadedly connected to the central tube (2). Multiple top rods (16) are installed at one end of the air pump (3). A pressure ring (12) is placed at the end of the multiple positioning rods away from the air pump (3) and is set to abut against the bottom surface of the main board (13).

2. The air flow regulation means based aspirating smoke fire detector according to claim 1, characterized in that: One end of the central pipe (2) is provided with a wiring groove (14), and the outside of the suction pump (3) is provided with a ring body (4). A sealing plate (5) is installed on the ring body (4) opposite to the wiring groove (14). The other end of the sealing plate (5) is inserted into the wiring groove (14) and is provided with an arc groove. The arc groove and the wiring groove (14) are combined to form a wiring channel (6). An annular groove is provided on the inner ring surface of the ring body (4). A limit ring is installed on the outer wall surface of the suction pump (3) opposite to the annular groove. The limit ring is movably set in the annular groove.

3. The airflow regulation device based aspirating smoke fire detector of claim 1, wherein: A connecting part (15) is formed by protruding on the inner side of the fixing plate (7). The connecting part (15) is inserted into the opening of the housing (1) and is threadedly connected to the housing (1). Multiple fixing holes are provided on the outer ring of the fixing plate (7).

4. The airflow regulation device based aspirating smoke fire detector of claim 1, wherein: Each air inlet (9) is equipped with a filter screen (8).

5. The airflow regulation device based aspirating smoke fire detector of claim 1, wherein: A microcontroller is installed on the motherboard (13), and the suction pump (3) is controlled by the microcontroller.

6. The airflow regulation device based aspirating smoke fire detector of claim 1, wherein: The suction pump (3) is an adjustable speed suction pump (3).

7. The airflow regulation device based aspirating smoke fire detector of claim 1, wherein: The smoke sensor (10) is a photoelectric smoke sensor (10).

8. The airflow regulation device based aspirating smoke fire detector of claim 1, wherein: Ventilation channels are formed between the main board (13) and the positioning ring (11) as well as between the main board (13) and the crusher.

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