Smoke fire alarm

Abstract

The invention relates to the technical field of fire fighting equipment, in particular to a smoke fire alarm which comprises a centrifugal fan and a tubular part. The top surface of the cover plate is attached to the bottom surface of the detection chamber by using the electromagnetic chuck, and the shielding effect of the flue check valve is utilized, so that dust can be effectively prevented from entering the detection chamber to cause false alarm, and the sensitivity of smoke detection is improved; when the temperature sensing sensor detects that a preset threshold value is exceeded, a signal is sent to the controller, and the controller controls the centrifugal fan to start and the button to bounce, so that the two electromagnetic chucks are powered off; under the action of gravity, the air pipe falls down, and the centrifugal fan blows open the flue check valve, so that the air pipe can suck smoke at a lower height into the detection chamber, the induction speed of smoke detection is improved, and the alarm is advanced; and meanwhile, the centrifugal fan only works when detection is needed, so that resources are effectively saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire-fighting equipment, in particular to a smoke fire alarm. BACKGROUND

[0002] With the increase of power consumption in various workplaces, the frequency of fires caused by power failures is increasing. Once a fire occurs, it is easy to appear not timely, lack of fire extinguishing equipment and panic, and slow escape of people on the scene, etc. Unfavorable factors ultimately lead to significant loss of life and property.

[0003] At present, the point type smoke fire detector widely used in the market is based on the optical scattering principle, and its core mechanism is: when smoke particles enter the closed detection cavity, the light beam emitted by the infrared emission device in the cavity is scattered, and the infrared receiving element captures the scattered light signal, which is analyzed by the signal processing module to trigger the alarm.

[0004] However, such detectors have significant defects in actual application: on the one hand, they rely on the natural convection of smoke particles to diffuse to the detection cavity, and the smoke generated in the early stage of the fire is affected by temperature gradient, building structure and other factors, and the diffusion speed is slow, resulting in a long time interval from smoke generation to alarm triggering, which is difficult to meet the early warning demand; on the other hand, during long-term operation, dust, lint and other particles in the environment will gradually deposit in the detection cavity, interfering with the signal collection of the optical element, causing the sensitivity of the detector to decay, and even causing false alarms or missed alarms. Especially in industrial plants, warehouses and other scenes with high dust concentration, the reliability of traditional detectors is more prominent. SUMMARY

[0005] Therefore, the present application is designed to avoid the above problems, and the purpose of the present application is to provide a smoke fire alarm, which can prevent dust from entering the detection chamber, cause false alarms, improve the sensitivity and real-time of smoke detection, and use the air pipe to suck the smoke at a lower height into the detection chamber, not only improve the sensing speed, but also make the alarm in advance. The present application realizes the above-mentioned purpose through the following technical solutions:

[0006] The application discloses a smoke fire alarm, which comprises a centrifugal fan and a tubular part, the air inlet of the centrifugal fan faces downward, the tubular part is arranged below the centrifugal fan, an annular partition plate and a tubular detection chamber are arranged in the tubular part, the partition plate is coaxially arranged in the middle of the tubular part, and the detection chamber is coaxially arranged in the tubular part and fixed in the tubular part; the space between the inner wall of the tubular part and the outer wall of the detection chamber is divided into a main control chamber and a containing chamber by the partition plate; the main control chamber is arranged above the containing chamber; the upper opening of the detection chamber has the same radius as the air inlet of the centrifugal fan, and a smoke sensor is arranged in the detection chamber; a controller, an audible and visual alarm and an electromagnetic suction disc are arranged in the main control chamber; a button is arranged on the outer wall of the main control chamber; the electromagnetic suction disc is provided with two magnetic surfaces which penetrate through the partition plate and are arranged on the same plane as the bottom surface of the partition plate; a wind pipe is arranged on the bottom surface of the partition plate, a disc-shaped blocking plate is connected to the bottom end of the wind pipe, the blocking plate is made of a magnetic conductive material; the radius of the blocking plate is the same as the inner diameter of the tubular part; the blocking plate is composed of a disc-shaped cover plate and an annular filter screen; the cover plate is arranged in the middle of the blocking plate, the radius of the cover plate is the same as the outer diameter of the detection chamber, and the bottom surface of the blocking plate is arranged on the same plane as the bottom surface of the containing chamber; and a temperature sensor is further arranged on the bottom surface of the cover plate.

[0007] Preferably, the tubular part is coaxial with the air inlet of the centrifugal fan, and the radius of the tubular part is greater than the radius of the air inlet of the centrifugal fan but less than the radius of the centrifugal fan; and the top surface of the tubular part is attached to the bottom surface of the shell of the centrifugal fan.

[0008] Preferably, the outer edge of the partition plate is fixedly connected with the inner wall of the tubular part, the inner edge of the partition plate is fixedly connected with the outer wall of the detection chamber, the top surface of the detection chamber is arranged on the same plane as the top surface of the tubular part, and the bottom surface of the detection chamber is higher than the bottom surface of the tubular part but lower than the partition plate.

[0009] Preferably, the controller is electrically connected with the centrifugal fan, the smoke sensor, the button, the audible and visual alarm, the electromagnetic suction disc and the temperature sensor respectively.

[0010] Preferably, the wind pipe is a telescopic corrugated pipe made of a fireproof material.

[0011] Preferably, a flue check valve is arranged on the air outlet of the centrifugal fan.

[0012] The application has the following beneficial effects:

[0013] The electromagnetic suction disc is used to make the top surface of the cover plate adhere to the bottom surface of the detection chamber, and the shielding effect of the flue check valve can effectively prevent dust from entering the inside of the detection chamber, causing false alarm, and improve the sensitivity of smoke detection. When the temperature sensor detects that the preset threshold is exceeded, a signal is sent to the controller, the controller controls the centrifugal fan to start, the button pops up, so that the two electromagnetic suction discs are powered off; under the action of gravity, the air pipe falls, and the centrifugal fan blows open the flue check valve, so that the air pipe can suck the smoke at a lower height into the detection chamber, improve the induction speed of smoke detection, and make the alarm in advance; at the same time, the centrifugal fan only works when detection is needed, which effectively saves resources. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic view of the overall structure of the present application.

[0015] Figure 2 It is a schematic view of the bottom surface structure of the present application.

[0016] Figure 3 It is a sectional view of the tubular part of the present application.

[0017] Figure 4 It is a schematic view of the internal structure of the main control chamber of the present application.

[0018] Figure 5 It is a schematic view of the internal structure of the containing chamber of the present application.

[0019] Figure 6 It is a schematic view of the structure when the alarm of the present application.

[0020] Reference signs: 10, centrifugal fan; 11, flue check valve; 20, tubular part; 21, partition; 22, detection chamber; 23, main control chamber; 24, containing chamber; 30, air pipe; 31, blocking plate; 32, cover plate; 33, filter screen; 40, controller; 50, smoke sensor; 60, audible and visual alarm; 70, electromagnetic suction disc; 80, button; 90, temperature sensor. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present application will be described in detail with reference to the accompanying drawings, so that those with ordinary skill in the art can easily implement these embodiments. However, the present application can be implemented in many different forms, and therefore the present application is not limited to the embodiments described below. In addition, in order to more clearly describe the present application, components unrelated to the present application will be omitted from the drawings.

[0022] As Figures 1-4As shown, a smoke fire alarm includes a centrifugal fan 10 and a tubular portion 20, wherein the entire device is installed on the ceiling of a house through the housing of the centrifugal fan 10, the air inlet of the centrifugal fan 10 faces downward, and the air outlet of the centrifugal fan 10 is equipped with a flue check valve 11 to prevent dust from entering the interior of the centrifugal fan 10 when the centrifugal fan 10 is not working;

[0023] The tubular portion 20 is installed below the centrifugal fan 10. The tubular portion 20 is coaxial with the air inlet of the centrifugal fan 10, and its radius is larger than the radius of the air inlet of the centrifugal fan 10, but smaller than the radius of the centrifugal fan 10. The top surface of the tubular portion 20 is in contact with the bottom surface of the outer shell of the centrifugal fan 10. The interior of the tubular portion 20 is provided with an annular partition 21 and a tubular detection chamber 22. The partition 21 is coaxially located in the middle of the tubular portion 20, and the detection chamber 22 is coaxially fixed to the tubular portion through the partition 21. Inside the tubular portion 20, specifically, the outer edge of the partition 21 is fixedly connected to the inner wall of the tubular portion 20, and the inner edge of the partition 21 is fixedly connected to the outer wall of the detection chamber 22. The top surface of the detection chamber 22 is in the same plane as the top surface of the tubular portion 20, and the bottom surface of the detection chamber 22 is higher than the bottom surface of the tubular portion 20 but lower than the partition 21. The space between the inner wall of the tubular portion 20 and the outer wall of the detection chamber 22 is divided by the partition 21 into a main control chamber 23 and a receiving chamber 24, wherein the main control chamber 23 is located above the receiving chamber 24;

[0024] The upper opening radius of the detection chamber 22 is the same as the air inlet radius of the centrifugal fan 10. A smoke sensor 50 for detecting smoke is provided inside the detection chamber 22.

[0025] like Figure 4 As shown, the main control room 23 is internally provided with a controller 40, an audible and visual alarm 60, and an electromagnetic suction cup 70. A button 80 is provided on the outer wall of the main control room 23. The controller 40 is electrically connected to the centrifugal fan 10, the smoke sensor 50, the button 80, the audible and visual alarm 60, and the electromagnetic suction cup 70, respectively. The controller 40 is used to control the operation of the entire device. There are two electromagnetic suction cups 70. The magnetic surfaces of the two electromagnetic suction cups 70 both pass through the partition 21 and are in the same plane as the bottom surface of the partition 21. The two electromagnetic suction cups 70 are 180 degrees apart. When the button 80 is pressed, the controller 40 controls the two electromagnetic suction cups 70 to be charged, so that the two electromagnetic suction cups 70 generate magnetic force.

[0026] like Figures 5-6As shown, the air pipe 30 is a telescopic corrugated pipe made of fireproof material, the top end of the air pipe 30 is connected to the bottom surface of the partition plate 21, the bottom end of the air pipe 30 is connected with a disc-shaped plug plate 31, the plug plate 31 is made of magnetic conductive material, the radius of the plug plate 31 is the same as the inner diameter of the tubular part 20, the plug plate 31 is composed of a disc-shaped cover plate 32 and an annular filter screen 33, the cover plate 32 is located in the middle of the plug plate 31, the radius of the cover plate 32 is the same as the outer diameter of the detection chamber 22, when the air pipe 30 is folded and located in the containing chamber 24, the plug plate 31 is located in the containing chamber 24 under the magnetic force of the two electromagnetic suction discs 70, the top surface of the cover plate 32 of the plug plate 31 is attached to the bottom surface of the detection chamber 22, which can prevent dust from entering the inside of the containing chamber 24, the bottom surface of the plug plate 31 is in the same plane as the bottom surface of the containing chamber 24, when the two electromagnetic suction discs 70 are powered off, the plug plate 31 drives the air pipe 30 to fall under the action of gravity, at this time, the cover plate 32 is separated from the detection chamber 22, the detection chamber 22 is communicated with the outside through the air pipe 30 and the filter screen 33, and lower height smoke can enter the detection chamber 22 under the suction force of the centrifugal fan 10;

[0027] The bottom surface of the cover plate 32 is further provided with a temperature sensor 90, the temperature sensor 90 is electrically connected with the controller 40, the temperature sensor 90 is used for detecting temperature, when a temperature exceeding a preset threshold value is detected, a signal is sent to the controller 40, the controller 40 controls the centrifugal fan 10 to start and the button 80 to pop up, at this time, the two electromagnetic suction discs 70 are powered off, the plug plate 31 drives the air pipe 30 to fall under the action of gravity, the cover plate 32 is separated from the detection chamber 22, the detection chamber 22 is communicated with the outside through the air pipe 30 and the filter screen 33, lower height smoke can enter the detection chamber 22 under the suction force of the centrifugal fan 10, the response speed of smoke detection is improved, and at the same time, the flue check valve 11 on the air outlet of the centrifugal fan 10 is blown open, when the smoke sensor 50 detects smoke, the smoke sensor 50 sends a signal to the controller 40, the controller 40 controls the sound and light alarm 60 to act, which is convenient for people to find the occurrence of fire.

[0028] Working principle of the present application:

[0029] Before use, the button 80 is pressed down, the controller 40 controls the two electromagnetic suction discs 70 to be powered on, so that the two electromagnetic suction discs 70 generate magnetic force, then the air pipe 30 is folded and located in the containing chamber 24, under the magnetic force of the electromagnetic suction disc 70, the top surface of the cover plate 32 of the plug plate 31 is attached to the bottom surface of the detection chamber 22, in the detection state, when the temperature sensor 90 detects a temperature exceeding a preset threshold value, a signal is sent to the controller 40, the controller 40 controls the centrifugal fan 10 to start and the button 80 to pop up, at this time, the two electromagnetic suction discs 70 are powered off;

[0030] Under the action of gravity, the blocking plate 31 drives the air pipe 30 to fall, the cover plate 32 is separated from the detection chamber 22, the detection chamber 22 is communicated with the outside through the air pipe 30 and the filter screen 33, under the suction force of the centrifugal fan 10, the smoke with lower height enters the detection chamber 22, and the flue check valve 11 on the air outlet of the centrifugal fan 10 is blown open. When the smoke sensor 50 detects the smoke, the smoke sensor 50 sends a signal to the controller 40, the controller 40 controls the sound and light alarm 60 to act, and the alarm work for the fire is completed.

Claims

1. A smoke fire alarm, comprising a centrifugal fan (10) and a tubular portion (20), characterized in that: The air inlet of the centrifugal fan (10) faces downward, the tubular portion (20) is installed below the centrifugal fan (10), and an annular partition (21) and a tubular detection chamber (22) are provided inside the tubular portion (20), the partition (21) is coaxially located in the middle of the tubular portion (20), and the detection chamber (22) is coaxially fixed inside the tubular portion (20) through the partition (21); the space between the inner wall of the tubular portion (20) and the outer wall of the detection chamber (22) is divided into a main control chamber (23) and a receiving chamber (24) by the partition (21); the main control chamber (23) is located above the receiving chamber (24); the upper opening radius of the detection chamber (22) is the same as the air inlet radius of the centrifugal fan (10), and a smoke sensor (50) is provided inside the detection chamber (22); a controller (40) and an audible and visual alarm (60) are provided inside the main control chamber (23). ) and an electromagnetic suction cup (70); a button (80) is provided on the outer wall of the main control room (23); there are two electromagnetic suction cups (70); the magnetic surfaces of the two electromagnetic suction cups (70) both pass through the partition (21) and are in the same plane as the bottom surface of the partition (21); an air duct (30) is provided on the bottom surface of the partition (21); the bottom end of the air duct (30) is connected to a disc-shaped blocking plate (31), and the blocking plate (31) is made of a magnetic conductive material; the blocking plate The radius of (31) is the same as the inner diameter of the tubular portion (20), and the blocking plate (31) is composed of a disc-shaped cover plate (32) and an annular filter screen (33); the cover plate (32) is located in the middle of the blocking plate (31), the radius of the cover plate (32) is the same as the outer diameter of the detection chamber (22), and the bottom surface of the blocking plate (31) and the bottom surface of the accommodating chamber (24) are in the same plane; the bottom surface of the cover plate (32) is also provided with a temperature sensor (90).

2. A smoke fire alarm according to claim 1, characterized in that: The tubular portion (20) is coaxial with the air inlet of the centrifugal fan (10), and its radius is larger than the radius of the air inlet of the centrifugal fan (10) but smaller than the radius of the centrifugal fan (10); the top surface of the tubular portion (20) is in contact with the bottom surface of the outer casing of the centrifugal fan (10).

3. The smoke fire alarm according to claim 1, characterized in that: The outer edge of the partition (21) is fixedly connected to the inner wall of the tubular portion (20), and the inner edge of the partition (21) is fixedly connected to the outer wall of the detection chamber (22). The top surface of the detection chamber (22) and the top surface of the tubular portion (20) are in the same plane, and the bottom surface of the detection chamber (22) is higher than the bottom surface of the tubular portion (20) but lower than the partition (21).

4. The smoke fire alarm according to claim 1, characterized in that: The controller (40) is electrically connected to the centrifugal fan (10), the smoke sensor (50), the button (80), the sound and light alarm (60), the electromagnetic suction cup (70), and the temperature sensor (90), respectively.

5. The smoke fire alarm according to claim 1, characterized in that: The air duct (30) is a telescopic bellows made of fireproof material.

6. The smoke fire alarm according to claim 1, characterized in that: The air outlet of the centrifugal fan (10) is equipped with a flue check valve (11).

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