Fireproof air pipe flange connecting structure capable of preventing cold bridge

Abstract

The utility model relates to the technical field of building air pipes, in particular to a fireproof air pipe flange connecting structure capable of preventing a cold bridge, which comprises two sections of air pipe bodies, angle steel type flanges are arranged on opposite sides of the two sections of air pipe bodies, and the angle steel type flanges are fixedly connected with the air pipe bodies through rivets. One side of each angle steel type flange is provided with an inorganic fire-resistant non-metal material layer, and the two inorganic fire-resistant non-metal material layers are connected and fixed through a C-shaped groove. The inside and the outside of the air pipe flange are both of a steel structure, the steel belt is used for one-time forming, and therefore cost is reduced, assembling efficiency is high, air pipes are connected through the angle steel type flanges, the structural strength of an air pipe pipeline is improved, galvanized steel plates are adopted as the connecting ends on the two sides, the angle steel type flanges are connected in a broken bridge mode, and the connecting efficiency is improved. The inorganic fireproof non-metal material layer can be effectively fixed, secondary heat preservation is not needed, and the phenomena of condensation and condensation caused by alternate cooling and heating are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of building air ducts, in particular to a fire-resistant air duct flange connection structure capable of preventing cold bridges. Background Art

[0002] Anti-cold-tide duct flange connections are mainly used on central air-conditioning ventilation ducts. The temperature inside the ventilation duct is different from the temperature outside the duct, which easily forms condensation. If no insulation treatment is done, dripping is likely to form at the metal joints. The formation of condensation will cause energy waste, and the produced water droplets will also have a certain impact on the environment. Therefore, the duct connections are currently used to prevent cold tides mainly with broken bridge aluminum or PVC flanges.

[0003] As design requirements change, some fire-resistant pipes in public areas are usually required to serve as air-conditioning pipes, thereby reducing the overall cost and improving space utilization. Therefore, the original thermal break aluminum flanges or PVC flanges can no longer meet the fire resistance requirements. Generally speaking, when the pipe temperature exceeds 280°C and an open flame is generated, the maximum temperature reaches 1250°C. Therefore, the PVC material of the thermal break flange technology will burn when it encounters an open flame, which obviously cannot meet the fire protection requirements. The thermal break aluminum flange uses PVC for the inner cavity and aluminum alloy for the outer cavity, so it also cannot meet the fire resistance requirements. Since air-conditioning ducts belong to the low-pressure ventilation category, they generally use lightweight materials, and the bulk density of the insulation material is generally 60-80kg / m 3 The thickness of the inner and outer steel plates is 0.35-0.5mm, the pipe weight is relatively light, and the use of PVC or aluminum flanges can meet the needs. According to the requirements of fire smoke exhaust, the thickness of the air duct is generally 0.75-2mm, and the bulk density of the insulation material is generally 96-850kg / m 3 , there are obvious hardness requirements for pipe flange connections.

[0004] Finished air ducts are a new design in prefabricated buildings. In the finished air ducts currently designed, air conditioning ducts and fire-resistant ducts are processed in the factory and directly hoisted on site. During the connection process, the air conditioning ducts need to be insulated twice to avoid cold waves. The fire-resistant ducts provide different fire-resistant requirements according to different regions, including fire-resistant 30min\60min\90min\120min\180min, etc. The commonly used finished air conditioning duct structure is a three-layer structure, with color steel plates inside and outside and insulation materials in the middle. The use of traditional angle steel flanges will form condensation at the flanges, and generally requires secondary wrapping after hoisting to reduce condensation. At present, broken bridge flanges are also used for connection. The broken bridge flange structure includes: inserted PVC flanges (connected with non-metallic materials) and broken bridge aluminum flanges (aluminum inside and outside, PVC in the middle to reduce the transfer of cold and heat inside and outside) to reduce the generation of condensation.

[0005] The commonly used finished fire-resistant duct structure is a multi-layer structure, generally including inner and outer steel plates, with insulation material in the middle, and connected by angle steel flanges. All components need to be fire-resistant and must be fire-resistant for more than the specified time. In order to effectively improve space utilization and reduce overall costs, the return air duct is usually used as a smoke exhaust duct. It is usually used as air conditioning ventilation and as a smoke exhaust duct after a fire. Therefore, the duct is required to be both heat-insulated and fire-resistant. Generally speaking, a fire-resistant branch pipe structure is used, and the angle steel flange needs to be insulated twice, which increases the cost and the appearance is very unsightly. The use of thermal break flanges is not fire-resistant, and the strength of aluminum alloy cannot bear the weight of the fire-resistant duct well. In the original double-layer thermal break aluminum structure, the ignition point of aluminum is relatively low, and the PVC material of the middle connecting component cannot meet the fire resistance requirements. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes a fire-resistant air duct flange connection structure capable of preventing cold bridges.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A fire-resistant air duct flange connection structure capable of preventing cold bridges, comprising two sections of air duct bodies, angle steel flanges are arranged on opposite sides of the two sections of the air duct bodies, the angle steel flanges are connected and fixed to the air duct bodies by rivets, an inorganic fire-resistant non-metallic material layer is arranged on one side of the angle steel flange, and the two inorganic fire-resistant non-metallic material layers are connected and fixed by a C-shaped groove;

[0009] An inner duct sleeve is arranged on the outer wall of the duct body, an outer duct sleeve is arranged on the outer side of the duct inner sleeve, and a heat-insulating fire-resistant layer is filled between the outer duct sleeve and the duct inner sleeve.

[0010] Preferably, galvanized steel plates are provided on both upper and lower sides of the connecting end of one side of the thermal insulation refractory layer close to the inorganic refractory non-metallic material layer, and the galvanized steel plates adopt a one-time continuous forming structure. Fixed points are provided on the outer walls of the two galvanized steel plates, and the galvanized steel plates on the two sections of the air duct body are connected and fixed by the fixed points.

[0011] Preferably, an angle steel flange outer sleeve is provided on the outer side of the inorganic refractory non-metallic material layer, and an angle steel flange inner sleeve is provided on the inner side of the inorganic refractory non-metallic material layer.

[0012] Preferably, the angle steel flanges are connected by a broken bridge structure.

[0013] Preferably, the thermal conductivity of the thermal insulation refractory layer is less than 0.033 W / m·K.

[0014] The beneficial effects of the utility model are:

[0015] By using steel structures for both the inside and outside of the duct flange and using steel strips for one-time molding, the cost is reduced and the assembly efficiency is high. The duct is connected using angle steel flanges to improve the structural strength of the duct. Galvanized steel plates are used as the connecting ends on both sides. The angle steel flanges are connected in the form of broken bridges, which can effectively fix the inorganic refractory non-metallic material layer. There is no need for secondary insulation, which effectively reduces condensation and condensation caused by alternating hot and cold, and further improves the overall insulation performance of the duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall assembly structure of a fire-resistant air duct flange connection structure capable of preventing cold bridges proposed by the utility model;

[0017] Figure 2 The utility model proposes a fire-resistant air duct flange connection structure capable of preventing cold bridges. Figure 1 The schematic diagram of the structure at the enlarged point A in the middle;

[0018] Figure 3 A schematic diagram of a single-section air duct body structure of a fire-resistant air duct flange connection structure capable of preventing cold bridges proposed by the utility model;

[0019] Figure 4 A schematic diagram of a connection structure of a heat-insulating fire-resistant layer and a galvanized steel plate of a fire-resistant air duct flange connection structure capable of preventing cold bridges proposed by the utility model;

[0020] Figure 5 This is a schematic diagram of the top view structure of an inorganic refractory non-metallic material layer of a refractory air duct flange connection structure capable of preventing cold bridges proposed by the utility model.

[0021] In the figure:

[0022] 1. Duct body; 2. Angle steel flange; 3. Rivets; 4. Inorganic refractory non-metallic material layer; 5. C-shaped groove; 6. Duct inner sleeve; 7. Duct outer sleeve; 8. Insulating refractory layer; 9. Galvanized steel plate; 10. Fixed connection point; 11. Angle steel flange outer sleeve; 12. Angle steel flange inner sleeve. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0025] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0026] Example:

[0027] Reference Figure 1-4 A fire-resistant duct flange connection structure capable of preventing cold bridges comprises two duct bodies 1, characterized in that angle steel flanges 2 are arranged on opposite sides of the two duct bodies 1, the angle steel flanges 2 are connected and fixed to the duct body 1 by rivets 3, an inorganic fire-resistant non-metallic material layer 4 is arranged on one side of the angle steel flange 2, and the two inorganic fire-resistant non-metallic material layers 4 are connected and fixed by a C-shaped groove 5;

[0028] An inner duct sleeve 6 is disposed on the outer wall of the duct body 1 , an outer duct sleeve 7 is disposed on the outer side of the duct inner sleeve 6 , and a heat-insulating fire-resistant layer 8 is filled between the outer duct sleeve 7 and the inner duct sleeve 6 .

[0029] The upper and lower sides of the connecting end of the thermal insulation refractory layer 8 close to the inorganic refractory non-metallic material layer 4 are provided with galvanized steel plates 9. The galvanized steel plates 9 adopt a one-time continuous molding structure. Fixed points 10 are provided on the outer walls of the two galvanized steel plates 9. The galvanized steel plates 9 on the two sections of the air duct body 1 are connected and fixed by the fixed points 10.

[0030] An angle steel flange outer sleeve 11 is arranged on the outer side of the inorganic refractory non-metallic material layer 4 , and an angle steel flange inner sleeve 12 is arranged on the inner side of the inorganic refractory non-metallic material layer 4 .

[0031] The angle steel flanges 2 are connected by a broken bridge structure.

[0032] The thermal conductivity of the heat-insulating refractory layer 8 is less than 0.033 W / m·K.

[0033] In this embodiment, the duct bodies 1 are connected to each other using angle steel flanges 2, and the C-shaped grooves 5 are directly inserted into the tops of the two angle steel flanges 2, so that the assembly of the angle steel flanges 2 and the duct body 1 is relatively simple and quick, while ensuring that the two sections of the duct body 1 are firmly connected and not prone to loosening or falling off. Since the angle steel flanges 2 have good durability, the overall strength of the duct body 1 is improved, and the galvanized steel plates 9 are used as the connecting ends of the angle steel flanges 2 on both sides. The inorganic refractory non-metallic material layer 4 is wrapped inside and outside with an angle steel flange outer sleeve 11 and an angle steel flange inner sleeve 12, and a one-time molding structure is adopted, so that the inorganic refractory non-metallic material layer 4 can be effectively fixed to support the duct body 1. The overall structure is relatively stable, ensuring that it is not easily deformed or damaged during the connection process. The angle steel flange outer sleeve 11 and the angle steel flange inner sleeve 12 use screws to fix the inorganic refractory non-metallic material layer 4 in the middle, thereby increasing the overall strength of the duct body 1 and the angle steel flange 2.

[0034] Furthermore, the inorganic refractory non-metallic material layer 4 utilizes inorganic fireproof non-metallic material as a heat-insulating material, so that the fire resistance grade of the inorganic refractory non-metallic material layer 4 reaches A1 level, so that the inorganic refractory non-metallic material layer 4 has two major properties of fire resistance and high temperature resistance. In addition, by connecting the angle steel flanges 2 in a broken bridge structure, there is no need for secondary insulation, which can effectively reduce condensation and coagulation caused by alternating hot and cold, thereby improving the thermal insulation performance of the air duct body 1.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fire-resistant air duct flange connection structure capable of preventing cold bridges, comprising two sections of air duct bodies (1), characterized in that: An angle steel flange (2) is provided on opposite sides of the two sections of the air duct body (1), and the angle steel flange (2) is connected and fixed to the air duct body (1) by means of rivets (3); an inorganic fire-resistant non-metallic material layer (4) is provided on one side of the angle steel flange (2), and the two inorganic fire-resistant non-metallic material layers (4) are connected and fixed by means of a C-shaped groove (5); The outer wall of the air duct body (1) is provided with an air duct inner sleeve (6), the outer side of the air duct inner sleeve (6) is provided with an air duct outer sleeve (7), and a heat-insulating fire-resistant layer (8) is filled between the air duct outer sleeve (7) and the air duct inner sleeve (6).

2. A fire-resistant duct flange connection structure capable of preventing cold bridges according to claim 1, characterized in that: The connection end of one side of the thermal insulation refractory layer (8) close to the inorganic refractory non-metallic material layer (4) is provided with galvanized steel plates (9) on both upper and lower sides. The galvanized steel plates (9) adopt a one-time continuous molding structure. The outer walls of the two galvanized steel plates (9) are provided with fixed points (10). The galvanized steel plates (9) on the two sections of the air duct body (1) are connected and fixed via the fixed points (10).

3. The fire-resistant air duct flange connection structure capable of preventing cold bridges according to claim 1, characterized in that: An angle steel flange outer sleeve (11) is arranged on the outer side of the inorganic refractory non-metallic material layer (4), and an angle steel flange inner sleeve (12) is arranged on the inner side of the inorganic refractory non-metallic material layer (4).

4. The fire-resistant duct flange connection structure capable of preventing cold bridges according to claim 1, characterized in that: The angle steel flanges (2) are connected by a broken bridge structure.

5. The fire-resistant air duct flange connection structure capable of preventing cold bridges according to claim 1, characterized in that: The thermal conductivity of the heat-insulating fire-resistant layer (8) is less than 0.033 W / m·K.

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