Smoke prevention and exhaust fire-resistant air pipe for building

Abstract

The utility model discloses a building smoke prevention and exhaust fire-resistant air pipe, and particularly relates to the field of fire-resistant air pipes, the building smoke prevention and exhaust fire-resistant air pipe comprises an outer pipe, an inner pipe is installed in the outer pipe, one end of the outer pipe and one end of the inner pipe are jointly connected with a dust collection cylinder, a filter plate is installed at the end of the dust collection cylinder, and a cleaning assembly is installed in the dust collection cylinder. One end of the cleaning assembly is matched with the filter plate, a filling opening is formed in the top end of the outer pipe, a sealing plug is installed in the filling opening, and a heat insulation cavity is formed between the outer pipe and the inner pipe. According to the utility model, the discharged smoke is gathered, and the flow rate of the smoke is increased by utilizing the Laval principle, so that the fan blades can be impacted to rotate, and particles in the smoke can be prevented from being deposited in the inner pipe while the cleaning brush cleans the filter plate, so that the particles in the smoke can be discharged from the dust discharge pipe; therefore, the phenomenon that combustible particles in smoke burn in the inner pipe is avoided, sparks are prevented from being discharged into the environment, and the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire-resistant air ducts, and more specifically, to a fire-resistant air duct for preventing and exhausting smoke in a building. Background Art

[0002] Smoke control and exhaust system is a general term for smoke control system and smoke exhaust system, which are composed of air supply and exhaust ducts, pipe wells, fire dampers, door switch equipment, supply and exhaust fans and other equipment. According to Article 3.3.7 of the Technical Standard for Building Smoke Control and Exhaust System GB51251-2017, the mechanical pressurized air supply system should use ducts for air supply. The air supply duct should be made of non-combustible materials and the inner wall should be smooth. When the inner wall of the air supply duct is metal, the design wind speed should not be greater than 20m / s; when the inner wall of the air supply duct is non-metallic, the design wind speed should not be greater than 15m / s. And the fire resistance limit of the mechanical pressurized air supply duct is stipulated in Article 3.3.8.

[0003] At present, the structure of fireproof air ducts is usually made of fireproof material boards to ensure that the smoke exhaust ducts meet the fire resistance requirements of technical standards. However, since the fireproof material boards are non-metallic materials, they have a large wind resistance to airflow. According to technical standards, the wind speed in the air duct can only be maintained at a low speed of 15m / s, which affects the exhaust efficiency.

[0004] The utility model patent with patent publication number CN214027508U discloses a steel fire-resistant and fireproof air duct, including a pipe body, wherein the pipe body is stacked with an outer metal layer, a microporous foam material layer, an inorganic material layer and an inner metal layer in sequence from the outside to the inside, and a bonding layer is provided between the inner metal layer and the inorganic material layer. The utility model improves the overall strength of the composite air duct plate, has excellent fire retardancy, has good fireproof and heat-insulating properties, is lighter than traditional smoke exhaust ducts, and is environmentally friendly and non-toxic.

[0005] However, when this structure is actually used, since the air duct adopts a straight tube structure and in the process of exhausting smoke through the air duct, incompletely burned light particles are usually mixed in the smoke, and after these light particles enter the air duct, they are easy to accumulate at the bottom of the air duct. When the exhaust temperature is too high, secondary combustion may occur, causing burning sparks to be discharged from the air duct, causing the risk of ignition to the external environment, thereby reducing the safety of use. Therefore, a building smoke exhaust fire-resistant air duct is proposed, which can avoid the accumulation of light particles inside the air duct, thereby avoiding secondary combustion. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the utility model provides a fire-resistant air duct for building smoke exhaust to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fire-resistant air duct for smoke exhaust in a building, comprising an outer tube, an inner tube installed in the outer tube, a dust collecting tube connected to one end of the outer tube and the inner tube, a filter plate installed at the end of the dust collecting tube, a cleaning assembly installed in the dust collecting tube, one end of the cleaning assembly is matched with the filter plate, a filling port is opened at the top of the outer tube, and a sealing plug is installed in the filling port.

[0008] Preferably, a heat-insulating cavity is formed between the outer tube and the inner tube, the heat-insulating cavity is communicated with the filling port, and the heat-insulating cavity is filled with aerogel.

[0009] Preferably, the inner tube comprises a smoke inlet tube, one end of which is connected and matched with the outer tube;

[0010] A smoke collecting pipe, one end of which is welded to the other end of the smoke inlet pipe;

[0011] A smoke exhaust pipe, one end of which is welded to the other end of the smoke collecting pipe.

[0012] Preferably, the interiors of the smoke inlet pipe and the smoke exhaust pipe are both conical structures, and the inner wall of the smoke inlet pipe is inclined downward, and the inner wall of the smoke exhaust pipe is inclined upward.

[0013] Preferably, the dust collecting cylinder comprises a cylinder body, one end of which is connected and matched with the outer tube and the smoke exhaust pipe;

[0014] A bracket, wherein the bracket is installed in the cylinder and the cleaning component is supported by the bracket;

[0015] A dust exhaust pipe is arranged at the bottom of the other end of the cylinder.

[0016] Preferably, the cleaning assembly comprises a rotating rod, and the rotating rod is rotatably mounted on the bracket;

[0017] A fan blade, wherein the fan blade is mounted on the rotating rod;

[0018] A cleaning brush is installed at the end of the rotating rod, and the cleaning brush is engaged with the filter plate.

[0019] Technical effects and advantages of the utility model:

[0020] 1. Through the arrangement of the smoke inlet pipe, the smoke collecting pipe and the smoke exhaust pipe, compared with the prior art, the smoke inlet pipe can gather the incoming smoke downward, so that the smoke and the mixed combustible particles can enter the smoke collecting pipe. After entering the smoke collecting pipe, the air flow rate increases instantly, so that the smoke can be discharged from the smoke exhaust pipe. Due to the increase in the air flow rate, the combustible particles can be automatically blown out to avoid deposition. The smoke exhaust pipe is inclined upward, so that the blowing direction of the discharged smoke is inclined, which is convenient for cooperation with the cleaning component and provides power for the cleaning component. At the same time, the accumulation of combustible particles at the port of the smoke collecting pipe is avoided, thereby maintaining the cleanliness of the inner pipe and avoiding the phenomenon of secondary combustion, so as to improve the safety of use;

[0021] 2. Through the arrangement of the bracket, the rotating rod, the fan blade, the cleaning brush and the filter plate, compared with the prior art, the fan blade can be blown by the high airflow discharged obliquely, so that the cleaning brush can be driven to rotate during the rotation of the fan blade, so that the cleaning brush can clean the impurities attached to the filter plate, thereby ensuring the ventilation effect of the filter plate and improving the smoke exhaust efficiency;

[0022] 3. By installing a dust exhaust pipe at the bottom of the cylinder, compared with the existing technology, larger particles in the smoke can be blocked by the filter plate, and can be discharged from the dust exhaust pipe after being cleaned by the cleaning brush, so that the particles in the smoke can be concentrated and discharged from the dust exhaust pipe, so that it is convenient to install a device for collecting smoke and dust through the dust exhaust pipe to collect the smoke and dust, thereby reducing pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0024] Figure 2 It is a side view stereoscopic structural schematic diagram of the utility model.

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0026] Figure 4 It is a structural schematic diagram of the inner tube of the utility model.

[0027] Figure 5 It is a schematic structural diagram of the dust collecting barrel of the present utility model.

[0028] Figure 6 It is a schematic diagram of the coordination structure of the cleaning component and the filter plate of the utility model.

[0029] The figures are marked as follows: 1. outer tube; 2. inner tube; 201. smoke inlet pipe; 202. smoke collecting pipe; 203. smoke exhaust pipe; 3. sealing plug; 4. dust collecting cylinder; 401. cylinder body; 402. bracket; 403. dust exhaust pipe; 5. filter plate; 6. filling port; 7. cleaning assembly; 701. rotating rod; 702. fan blades; 703. cleaning brush. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] As attached Figure 1-6 A fire-resistant air duct for smoke and exhaust in a building is shown, comprising an outer tube 1, an inner tube 2 is installed in the outer tube 1, a dust collecting tube 4 is commonly connected to one end of the outer tube 1 and the inner tube 2, a filter plate 5 is installed at the end of the dust collecting tube 4, a cleaning component 7 is installed in the dust collecting tube 4, one end of the cleaning component 7 is cooperated with the filter plate 5, a filling port 6 is opened at the top end of the outer tube 1, a sealing plug 3 is installed in the filling port 6, an insulating cavity is formed between the outer tube 1 and the inner tube 2, the insulating cavity is connected to the filling port 6, and the insulating cavity is filled with aerogel.

[0032] During specific implementation, the outer tube 1 is connected to the smoke exhaust port of the building so that the smoke enters the inner tube 2. After the smoke is gathered and accelerated by the inner tube 2, a high-speed airflow is generated to blow the cleaning component 7, so that the cleaning component 7 can operate to clean the smoke attached to the filter plate 5, so that the smoke in the smoke can be discharged in a concentrated manner, and the smoke is prevented from being deposited in the inner tube 2, thereby improving the safety of the air duct. At the same time, aerogel is filled in the insulation cavity formed between the outer tube 1 and the inner tube 2. The aerogel is light in weight and has the property of high thermal insulation effect. While improving the fire resistance, the overall weight of the air duct is reduced, thereby reducing the tension at the connection between the air duct and the building, thereby improving the stability of the air duct installation, and the filling of aerogel can reduce the cost of insulation materials.

[0033] As attached Figure 4 As shown, the inner tube 2 includes a smoke inlet tube 201, and one end of the smoke inlet tube 201 is connected and matched with the outer tube 1;

[0034] A smoke collecting pipe 202, one end of which is welded to the other end of the smoke inlet pipe 201;

[0035] A smoke exhaust pipe 203 , one end of which is welded to the other end of the smoke collecting pipe 202 .

[0036] The interiors of the smoke inlet pipe 201 and the smoke exhaust pipe 203 are both conical structures, and the inner wall of the smoke inlet pipe 201 is inclined downward, while the inner wall of the smoke exhaust pipe 203 is inclined upward.

[0037] During specific implementation, the incoming smoke can be gathered downward through the smoke inlet pipe 201, so that the smoke and the mixed combustible particles can enter the smoke gathering pipe 202. After entering the smoke gathering pipe 202, the inner diameter of the smoke gathering pipe 202 becomes smaller, thereby presenting the Laval effect, so that the air flow rate increases instantly, so that it can be quickly discharged from the smoke exhaust pipe 203. Since the air flow rate increases, the combustible particles can be automatically blown out to avoid deposition. The smoke exhaust pipe 203 has an inclined upward structure, which makes the blowing direction of the discharged smoke inclined, so as to facilitate the cooperation with the cleaning component 7 and provide power for the cleaning component 7. At the same time, the smoke airflow discharged from the smoke gathering pipe 202 is relatively large, which can generate a large thrust on the combustible particles, thereby avoiding the accumulation of combustible particles at the port of the smoke gathering pipe 202, thereby maintaining the cleanliness of the inner tube 2 and avoiding the phenomenon of secondary combustion, so as to improve the safety of use.

[0038] As attached Figure 5 As shown, the dust collecting cylinder 4 includes a cylinder body 401, one end of which is connected and matched with the outer tube 1 and the smoke exhaust pipe 203;

[0039] A bracket 402, wherein the bracket 402 is installed in the cylinder 401, and the cleaning component 7 is supported by the bracket 402;

[0040] The dust exhaust pipe 403 is arranged at the bottom of the other end of the cylinder 401.

[0041] During specific implementation, the cylinder 401 is connected and fixed with the outer tube 1 and the smoke exhaust pipe 203 to facilitate the assembly and disassembly between the outer tube 1, the inner tube 2 and the dust collecting cylinder 4. At the same time, the cleaning component 7 is supported by the bracket 402 so that the cleaning component 7 can be stably placed in the cylinder 401. The dust exhaust pipe 403 is arranged to facilitate the centralized discharge of smoke in the smoke and the collection of smoke from the bottom of the dust exhaust pipe 403 to reduce the pollution of the environment by smoke entering the environment.

[0042] As attached Figure 6 As shown, the cleaning assembly 7 includes a rotating rod 701, and the rotating rod 701 is rotatably mounted on the bracket 402;

[0043] The fan blade 702 is mounted on the rotating rod 701;

[0044] A cleaning brush 703 is installed at the end of the rotating rod 701 , and the cleaning brush 703 is engaged with the filter plate 5 .

[0045] During specific implementation, the high airflow discharged at an angle can blow the fan blades 702, so that during the rotation of the fan blades 702, the rotating rod 701 can also rotate, thereby driving the cleaning brush 703 to rotate, so that the cleaning brush 703 can cyclically clean the impurities attached to the filter plate 5 during the rotation, thereby ensuring the ventilation effect of the filter plate 5 and improving the smoke exhaust efficiency.

[0046] Working principle of the utility model: when the smoke exhaust and fire-resistant air duct of the building is installed on the building for smoke exhaust, the smoke exhausted through the smoke inlet pipe 201 is gathered downward, so that the smoke enters the smoke collecting pipe 202, and the Laval principle is used to increase the smoke flow rate in the smoke collecting pipe 202, so that the inclined upward smoke airflow discharged from the smoke exhaust pipe 203 can impact the fan blades 702 to rotate, so that the cleaning brush 703 cleans the impurities attached to the filter plate 5 as it rotates, thereby preventing particles in the smoke from being deposited in the inner tube 2, so that the particles in the smoke can be discharged from the dust exhaust pipe 403, thereby preventing combustible particles in the smoke from burning in the inner tube 2, thereby avoiding sparks from being discharged into the environment, and improving safety of use. At the same time, by filling the insulation cavity formed in the outer tube 1 and the inner tube 2 with aerogel, a higher insulation effect is achieved, thereby improving fire resistance, and the filling of aerogel can reduce the cost of insulation materials.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fire-resistant building smoke exhaust duct, comprising an outer tube (1), characterized in that: An inner tube (2) is installed in the outer tube (1); one end of the outer tube (1) and the inner tube (2) are connected to a dust collecting tube (4); a filter plate (5) is installed at the end of the dust collecting tube (4); a cleaning component (7) is installed in the dust collecting tube (4); one end of the cleaning component (7) is arranged in cooperation with the filter plate (5); a filling port (6) is provided at the top end of the outer tube (1); a sealing plug (3) is installed in the filling port (6); The inner tube (2) comprises a smoke inlet tube (201), one end of the smoke inlet tube (201) being connected and matched with the outer tube (1); A smoke collecting pipe (202), one end of the smoke collecting pipe (202) being welded to the other end of the smoke inlet pipe (201); A smoke exhaust pipe (203), one end of the smoke exhaust pipe (203) being welded to the other end of the smoke collecting pipe (202); The interiors of the smoke inlet pipe (201) and the smoke exhaust pipe (203) are both conical structures, and the inner wall of the smoke inlet pipe (201) is inclined downward, while the inner wall of the smoke exhaust pipe (203) is inclined upward.

2. A fire-resistant building smoke exhaust duct according to claim 1, characterized in that: A heat-insulating cavity is formed between the outer tube (1) and the inner tube (2), the heat-insulating cavity is connected to the filling port (6), and the heat-insulating cavity is filled with aerogel.

3. A fire-resistant building smoke exhaust duct according to claim 2, characterized in that: The dust collecting cylinder (4) comprises a cylinder body (401), one end of the cylinder body (401) being connected and matched with the outer tube (1) and the smoke exhaust pipe (203); A bracket (402), wherein the bracket (402) is installed in the cylinder (401), and the cleaning component (7) is supported by the bracket (402); A dust exhaust pipe (403) is arranged at the bottom of the other end of the cylinder (401).

4. A fire-resistant building smoke exhaust duct according to claim 3, characterized in that: The cleaning assembly (7) comprises a rotating rod (701), and the rotating rod (701) is rotatably mounted on the bracket (402); A fan blade (702), wherein the fan blade (702) is mounted on the rotating rod (701); A cleaning brush (703), wherein the cleaning brush (703) is mounted on the end of the rotating rod (701), and the cleaning brush (703) is engaged with the filter plate (5).

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