Smoke exhaust device for fire engineering

Abstract

A smoke exhaust device for fire engineering comprises a smoke exhaust pipe, a square pipeline, an air return baffle, an air supply system, a high-pressure air cavity, an air ejector pipe and a pressure sensor. According to the utility model, the two air return baffles are arranged, and the pressure sensor is arranged at the abutting part of the two air return baffles; when the outside pressure is larger than the indoor pressure, the two air return baffles abut against each other, and when the pressure detected by the pressure sensor reaches a set value, the air supply system is started, so that the two air return baffles are blown open and counteract the outside pressure; therefore, the phenomenon that smoke is easy to return in the original smoke exhaust pipe is eliminated, and timely exhaust of indoor smoke is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke exhaust equipment, in particular to a smoke exhaust device for fire protection engineering. Background Art

[0002] In social life, fire is one of the disasters that threaten public safety and endanger people's lives and property, especially in construction projects. After a fire occurs, the biggest harm to people is often not burning, but toxic smoke, so exhaust ducts are generally installed in buildings. For example, Chinese patent announcement number CN210373945U discloses a fire smoke exhaust device, which belongs to the field of fire protection technology, including a smoke exhaust machine installed in a first through hole on the wall, the smoke exhaust machine is located at the inner and outer ends of the wall, respectively set as a smoke inlet and a smoke exhaust port, the smoke exhaust port of the smoke exhaust machine is blocked by a baffle, the outer side of the wall is provided with a cylinder for driving the baffle to move in the vertical direction, the inner side of the wall is provided with a smoke sensor and a controller for receiving the smoke sensor signal, the controller controls the cylinder and the smoke exhaust machine to work, and the technical effect is to reduce the possibility of winter cold wind passing through the smoke exhaust machine into the room. However, the utility model has the following problems in actual use: when the outdoor wind pressure is too high (for example, the wind blows directly from the smoke exhaust pipe), the existing device is more likely to produce smoke return when exhausting smoke, causing the smoke to return to the room, thereby resulting in the indoor smoke cannot be discharged in a timely and effective manner. Utility Model Content

[0003] The purpose of the utility model is to provide a smoke exhaust device for fire protection engineering, which is used to solve the problems mentioned in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides a smoke exhaust device for fire protection engineering, including a square pipe installed at the end of the smoke exhaust pipe and two return air baffles symmetrically distributed and hinged inside the square pipe, there is an angle between the return air baffle and the side wall of the square pipe, the two return air baffles are abutted against each other at one end away from the hinge, the direction from the hinge of the return air baffle to the abutment is consistent with the smoke exhaust direction of the smoke exhaust pipe, a high-pressure air cavity connected to the air supply system is provided inside the square pipe between the smoke exhaust pipe and the return air baffle, a plurality of jet pipes pointing to the return air baffle are provided on the high-pressure air cavity, and a pressure sensor is also provided on the abutment of the return air baffle.

[0005] Furthermore, a spring is fixedly connected between the return air baffle and the square pipe, and when the spring is not subjected to force, the abutting points of the two return air baffles are separated.

[0006] Further, a first notch is provided on the return air baffle, a first permanent magnet is embedded in the first notch, a second notch is provided on the inner wall of the square duct, and a second permanent magnet for attracting the first permanent magnet is embedded in the second notch.

[0007] Further, the second notch is an arc-shaped notch, and the center of the arc-shaped notch coincides with the axis of the hinge joint in the return air baffle.

[0008] Further, two of the springs and two of the first permanent magnets are symmetrically distributed on each return air baffle, and the second notches corresponding to the number of the first permanent magnets are provided on the inner wall of the square duct.

[0009] Further, a chamfer is provided on an inner side of the high-pressure air chamber close to the return air baffle, and the jet pipe is installed at the chamfer.

[0010] Further, there are four chamfers which are circumferentially distributed on the high-pressure air chamber.

[0011] Further, four partition plates are provided inside the high-pressure air chamber, and the partition plates divide the high-pressure air chamber into four air chamber units, and each air chamber unit is communicated with the air supply system through an air inlet pipe.

[0012] Further, a rubber plate is fixedly connected to the abutting portion of each return air baffle, and the two rubber plates are in flat abutment when abutting, and the pressure sensor is installed at the abutting portion of the rubber plate.

[0013] Further, the smoke exhaust pipe and the square duct are connected by a flange.

[0014] The beneficial effects of the present utility model: The present utility model is provided with two return air baffles, and a pressure sensor is provided at the abutting portion of the two return air baffles; when the external pressure is greater than the indoor pressure, the two return air baffles will abut, and when the pressure detected by the pressure sensor reaches the set value, the air supply system is started, so as to blow open the two return air baffles and offset the external pressure; thereby eliminating the phenomenon of easy smoke return in the original smoke exhaust pipe, which is beneficial to the timely discharge of indoor smoke. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0016] Figure 1 is the overall structural schematic diagram of the present utility model;

[0017] Figure 2 is the partial cross-sectional schematic diagram of the present utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of the high pressure chamber.

[0019] In the figure: 1. exhaust pipe; 2. flange; 3. high-pressure air chamber; 4. air inlet pipe; 5. square pipe; 6. return air baffle; 7. rubber sheet; 8. spring; 9. first permanent magnet; 10. second permanent magnet; 11. jet pipe; 12. chamfer; 13. partition. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] In one embodiment, Figure 1-3 As shown, a smoke exhaust device for fire protection engineering comprises a square pipe 5 installed at the end of a smoke exhaust pipe 1 and two return air baffles 6 symmetrically distributed and hinged inside the square pipe 5, an angle is formed between the return air baffles 6 and the side walls of the square pipe 5, the two return air baffles 6 are butted against each other at one end away from the hinge, the direction from the hinge of the return air baffle 6 to the butt joint is consistent with the smoke exhaust direction of the smoke exhaust pipe 1, a high-pressure air cavity 3 connected to the air supply system is provided inside the square pipe 5 between the smoke exhaust pipe 1 and the return air baffle 6, a plurality of jet pipes 11 pointing to the return air baffle 6 are provided on the high-pressure air cavity 3, and a pressure sensor is also provided on the butt joint of the return air baffle 6; wherein the pressure sensor is connected to the air supply system through a controller, and the air supply system adopts Conventional air supply devices, such as compressors or air pumps, will not be described in detail here; when it is windy outdoors and the external pressure is relatively high, due to the angle between the return air baffle 6 and the side wall of the square pipe 5, the two return air baffles 6 will abut against each other under the action of the external wind force. When the pressure sensor detects that the pressure value is the lowest set value, the controller will control the air supply system to start. At this time, high-pressure gas will be sprayed from the jet pipe 11 to the return air baffle 6, so that the two return air baffles 6 will open, offsetting the external wind pressure while accelerating the air flow rate at the outlet of the square pipe 5, thereby generating negative pressure, which is beneficial to sucking out the indoor smoke; therefore, the smoke exhaust pipe 1 in this utility model is not prone to the phenomenon of smoke return, and is beneficial to the timely discharge of indoor smoke.

[0022] In the present embodiment, a spring 8 is also fixedly connected between the return air baffle 6 and the square duct 5. When the spring 8 is not under stress, the abutment of the two return air baffles 6 is separated. When the spring 8 is not under stress, it means that the external pressure is less than the indoor pressure. At this time, the abutment is separated, and smoke can flow out from between the two return air baffles 6; and a first notch is provided on the return air baffle 6, and a first permanent magnet 9 is embedded in the first notch. A second notch is provided on the inner wall of the square duct 5, and a second permanent magnet 10 for absorbing the first permanent magnet 9 is embedded in the second notch, thereby preventing the two return air baffles 6 from being tightly attached to the inner wall of the square duct 5 after separation. At this time, it is not possible to effectively and timely prevent the outside wind from blowing into the room. In addition to the effect of generating smoke return, the outside wind pressure will also bring the outside oxygen into the room, thereby playing a combustion-supporting effect. Therefore, under the action of the first permanent magnet 9 and the second permanent magnet 10, the return air baffle 6 and the inner wall of the square duct 5 will form a certain angle. At this time, if the indoor pressure is high, it will flow out from between the two return air baffles 6. When the outside When the pressure is high, the return air damper 6 will be blown to rotate, so that the two return air dampers 6 will abut against each other, and then the outside air can be isolated from entering the room in a short time to prevent the combustion-supporting phenomenon. Subsequently, the high-pressure gas will be ejected and the two return air dampers 6 will be opened to offset the outside wind pressure while sucking out the indoor smoke. In addition, a boss can be provided at the end of the second notch close to the inner wall of the square pipe 5 to limit the return air damper 6 from abutting against the inner wall of the square pipe 5 due to the high indoor pressure. The second notch is an arc-shaped notch, and the center of the arc-shaped notch coincides with the axis of the hinge in the return air damper 6, thereby improving the limiting quality of the return air damper 6. In addition, the attraction of the first permanent magnet 9 and the second permanent magnet 10 is also conducive to the repeated collision of the two return air dampers 6, thereby generating noise. Two springs 8 and two first permanent magnets 9 are symmetrically distributed on each return air damper 6, and a second notch corresponding to the number of the first permanent magnets 9 is provided on the inner wall of the square pipe 5 to ensure the stable rotation of the return air damper 6.

[0023] In the present embodiment, a chamfer 12 is provided on an inner side of the high-pressure air cavity 3 close to the return air baffle 6, and the jet pipe 11 is installed at the chamfer 12. The chamfers 12 are provided at four places and are circumferentially distributed on the high-pressure air cavity 3, so that four air flows are blown toward the direction of the central axis of the square pipe 5, which is conducive to generating negative pressure and improving the quality of sucking out indoor smoke; and four partitions 13 are provided inside the high-pressure air cavity 3, and the partitions 13 divide the high-pressure air cavity 3 into four air cavity units, each of which is connected to the air supply system through the air inlet pipe 4, so as to ensure that the air output of each air flow is consistent; a rubber plate 7 is fixedly connected to the abutment of each return air baffle 6, and the two rubber plates 7 are in plane abutment when abutting, and the pressure sensor is installed at the abutment of the rubber plate 7. The rubber plate 7 can be made of rubber material with a small deformation amount to improve the wear resistance of the return air baffle 6; and the smoke exhaust pipe 1 is connected to the square pipe 5 through a flange 2, which is convenient for the installation of the square pipe 5.

[0024] Working principle: When it is windy outside and the pressure is high, due to the angle between the return air baffle 6 and the side wall of the square pipe 5, the two return air baffles 6 will abut against each other under the action of the external wind force. When the pressure sensor senses a certain pressure, the air supply system will start. At this time, high-pressure gas will be sprayed from the jet pipe 11 to the return air baffle 6, so that the two return air baffles 6 will open, thereby offsetting the external wind pressure. At the same time, the air flow rate at the outlet of the square pipe 5 is accelerated, thereby generating negative pressure, which is conducive to sucking out the indoor smoke; therefore, the smoke exhaust pipe 1 in this utility model is not prone to the phenomenon of smoke return, which is conducive to the timely discharge of indoor smoke.

[0025] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A smoke exhaust device for fire protection engineering, characterized in that: The invention comprises a square pipe (5) installed at the end of a smoke exhaust pipe (1) and two return air baffles (6) symmetrically distributed and hinged inside the square pipe (5); an angle is formed between the return air baffles (6) and the side walls of the square pipe (5); the ends of the two return air baffles (6) facing away from the hinge point abut against each other; the direction from the hinge point to the abutment point is consistent with the smoke exhaust direction of the smoke exhaust pipe (1); a high-pressure air cavity (3) connected to an air supply system is provided inside the square pipe (5) between the smoke exhaust pipe (1) and the return air baffles (6); a plurality of jet pipes (11) pointing to the return air baffles (6) are provided on the high-pressure air cavity (3); and a pressure sensor is also provided on the abutment point of the return air baffles (6).

2. The smoke exhaust device for fire protection engineering according to claim 1, characterized in that: A spring (8) is also fixedly connected between the return air baffle (6) and the square pipe (5); when the spring (8) is not subjected to force, the abutting points of the two return air baffles (6) are separated.

3. The smoke exhaust device for fire protection engineering according to claim 2, characterized in that: The return air baffle (6) is provided with a first notch, in which a first permanent magnet (9) is embedded, and the inner wall of the square pipe (5) is provided with a second notch, in which a second permanent magnet (10) for absorbing the first permanent magnet (9) is embedded.

4. The smoke exhaust device for fire protection engineering according to claim 3, characterized in that: The second notch is an arc-shaped notch, and the center of the arc-shaped notch coincides with the axis of the hinge in the return air baffle (6).

5. The smoke exhaust device for fire protection engineering according to claim 3, characterized in that: Two of the springs (8) and two of the first permanent magnets (9) are distributed on each of the return air baffles (6), and the inner wall of the square pipe (5) is provided with a number of the second notches corresponding to the number of the first permanent magnets (9).

6. The smoke exhaust device for fire protection engineering according to claim 1, characterized in that: A chamfer (12) is provided on an inner side of the high-pressure air chamber (3) close to the return air baffle (6), and the air injection pipe (11) is installed at the chamfer (12).

7. The smoke exhaust device for fire protection engineering according to claim 6, characterized in that: The chamfers (12) are provided at four locations and are circumferentially distributed on the high-pressure air cavity (3).

8. The smoke exhaust device for fire protection engineering according to claim 7, characterized in that: Four partitions (13) are arranged inside the high-pressure air chamber (3), and the partitions (13) divide the high-pressure air chamber (3) into four air chamber units. Each of the air chamber units is connected to the air supply system via an air inlet pipe (4).

9. The smoke exhaust device for fire protection engineering according to claim 1, characterized in that: The abutment of each of the return air baffles (6) is fixedly connected with a rubber plate (7), and when abutting, the two rubber plates (7) are in plane abutment, and the pressure sensor is mounted on the abutment of the rubber plates (7).

10. The smoke exhaust device for fire protection engineering according to claim 1, characterized in that: The smoke exhaust pipe (1) is connected to the square pipe (5) via a flange (2).

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