With the passage of time, people's requirements for ventilation duct cleaning and the saving of equipment and materials are also gradually improving; With the progress of technology, people's requirements for the quality of HVAC engineering have also increased. Many existing stainless steel air ducts and spiral round air ducts are used to meet the functional requirements of ventilation, air conditioning and dust removal transportation.
This requires continuous progress in existing technology and the adoption of more material-saving, healthier and more sustainable development strategies in equipment planning, development and manufacturing. At present, the metal air ducts used in air conditioning and ventilation projects mainly include circular air ducts and stainless steel air ducts. The circular air duct has high strength and less consumables, but the processing technology is messy and takes up a lot of space; Stainless steel air duct, easy to arrange and process, is widely used. There are also mechanical ones. The spiral shape is made of steel strip. There are circular and rectangular shapes. In order to save space, many stainless steel air ducts are made of flat circles.
The manufacturing and processing of ventilation pipes, especially for some small enterprises, manual workshop enterprises, such enterprises will not survive for a long time. Because we believe that the development of an enterprise is inseparable from the development of its corporate culture and brand strategy. Although the main air duct is still made of iron plate, there are many defects in construction and protection due to environmental protection, service life, moisture-proof, sound insulation, load-bearing and other reasons. This leads to the market demand for new products to improve this problem. The emergence of new stainless steel air ducts just meets the needs of shopping malls. After many engineering applications and practices, it is gradually accepted by investors.
Air ducts in shopping malls are generally divided into three categories: galvanized stainless steel air ducts, stainless steel air ducts and composite stainless steel air ducts. At the same time, the stainless steel air duct has good quality and strong applicability, but it is expensive. At present, galvanized steel air ducts are widely used in shopping malls. Galvanized stainless steel air duct is basically the feature of stainless steel air duct, but its price is two-thirds lower or even lower than that of stainless steel air duct. Composite stainless steel air duct is generally used in places where the external environment is relatively general and the requirements for air duct are not too high. Because the iron sheet is simple, chemical reactions occur in various environments, resulting in corrosion and rust. However, zinc hardly changes in dry air. In humid air, a good alkaline zinc carbonate film will be formed on the surface of zinc. Stainless steel air duct is mainly coated with zinc on the iron sheet of the air duct to protect the iron sheet. After passivation, dyeing or coating with light protective agent, the protective and decorative properties of zinc coating are significantly improved.
The durability of ventilation duct is poor. The molar ratio of magnesium chloride to magnesium oxide has scientific basis. The content of magnesium chloride should be determined according to the determination of active magnesium content in magnesium oxide. However, the manufacturers of unqualified products do not know the determination of magnesium oxide active magnesium content, let alone a reasonable molar ratio. Only magnesium oxide and salt water are known to solidify into air ducts. The residual chloride ion content in the air duct is large, and it is easy to return brine in the wet air environment, with low softening coefficient and short service life.