Pipes can be classified by cross-sectional shape and material. The fabric air duct ventilation duct is made by applying sealant (such as neutral glass glue) at the seams of bites, rivets and flanges. Before applying sealant, remove surface dust and oil. According to the cross-sectional shape, air ducts can be divided into circular air ducts, rectangular air ducts, flat air ducts, etc. Among them, the circular air duct has small resistance, large height, large size and complicated manufacturing. Therefore, rectangular ducts are the main application. The purification air duct is mainly used in industrial and construction projects, and its application fields mainly involve: the purification system of the dust-free workshop of the electronic industry, the purification system of the sterile workshop of medical food, etc. Pipe connection: 1. When connecting the air duct, the direction of the flange bolts should be consistent with the direction of air flow in the air duct, and the length of the screws should be the same. 2. The thickness of the air duct flange gasket should be 3~5 mm, and the cleaning system should not be less than 5 mm. The gasket should be flush with the flange and must not squeeze into the pipe. 3. When installing the air duct, do not drag the air duct, so as not to cause scratches, affect the appearance of the air duct, and even cause damage to the air duct. 4. Galvanized washers should be added on both sides of the connecting flange bolts of the FRP air duct. 5. The soda in the thermal insulation duct should be located outside the thermal insulation layer, and the thermal insulation layer should not be damaged. The cross-sectional shape of the fabric duct ventilation duct is generally divided into rectangular and circular. In the case of the same cross-sectional area, the circular ventilation duct not only has low resistance, but also has high strength, saving pipes. Circular ventilation ducts, the smaller the diameter, the easier it is to manufacture and the easier it is to keep warm. However, the pipe fittings of rectangular ventilation ducts are easier to make than circular ventilation ducts, and the arrangement is also simpler than that of circular ventilation ducts. The layout of ventilation ducts is directly related to the general layout of the ventilation system, and should be closely coordinated with other majors. If there are many exhaust points in the ventilation duct, a large-section manifold can be used to connect each branch pipe; in general, when the ventilation pipe cross-section is small and the flow velocity in the pipe is high, a circular ventilation pipe should be used; when the ventilation pipe cross-section When larger, rectangular ventilation ducts should be used, and the building space can be fully utilized. For rectangular ventilation ducts, the closer the aspect ratio is to 1, the better, which not only saves operating power, but also saves investment. Buried pipes or pipes in trenches should be coated with two coats of anti-rust paint and then two coats of asphalt paint; exposed pipes should be coated with two layers of anti-rust paint and then two coats of top coat. Buried cast iron pipes should be coated with two coats of asphalt paint and then a top coat; exposed cast iron pipes in the project should be coated with two coats of anti-rust paint first, and then a top coat. The coating quality should meet the following requirements: (1) The coating should be uniform and the color should be consistent; (2) The coating should be firmly attached, and the production of the spiral fabric air duct ventilation pipe should be free from defects such as peeling and air bubbles; (3) The coating Should be intact, not broken and runny. The rigid polyplastic sheet has a smooth surface and is easy to process, but it is not resistant to high temperature, and is suitable for corrosive industrial ventilation and exhaust systems. Ventilation ducts made of brick and concrete are mainly suitable for connection to buildings. Spiral fabric air duct ventilation duct has low resistance and is durable. In short, the material of the ventilation duct should be comprehensively selected according to the application conditions.
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