The all-pipe spiral air duct is a thin-walled circular pipe made of a spiral bite made of metal strips, which is mainly used in air conditioning and ventilation systems. The material is mainly galvanized sheet, and it can also be made of fabric air duct, copper, aluminum, color steel plate and micro-perforated plate, which are used in different occasions. Advantages: 1. Air tightness: 1. Each length of straight pipe is made of a whole piece of metal, which can achieve high air tightness; 2. When the spiral air duct is installed, the connection between the pipe and the pipe is relatively small. few. A typical round duct is 3-6 meters in length, while a rectangular duct is only 1-1.16 meters in length. If permitted, the round duct can be longer. 3. Only one joint is required to connect two air ducts, while rectangular air ducts require two completely separate flange system connections. 2. Consumables: 1. Under the same cross-sectional area, the perimeter of the rectangular air duct is 13% longer than that of the circular air duct, and the perimeter of the rectangular air duct with an aspect ratio of 1:2 is 20% longer than that of the circular air duct. , 1:3 is 30% more, and 1:4 is 41% more; therefore, the production plate of circular air ducts and the sealant and insulation materials used in installation are less than rectangular air ducts. 2. The same thermal insulation effect, compared with rectangular ducts, circular ducts can use thinner thermal insulation materials. Lower density insulation can also be used. 3. The number and size of mounting brackets can be reduced. The distance of the rectangular duct hanger bracket is 2.5M and the circular duct is 3M. 4. The superior structural characteristics of the circular air duct completely allow the use of thinner plates to process under the same conditions. 3. The piping system of the circular air duct is standardized. Due to the standardization of the size, a complete series of pipe fittings and joints can be prefabricated. The connection of the circular air duct is simple and only one person is required to install a circular air duct. A rectangular duct requires at least two people. Fourth, the friction loss of circular air ducts is smaller than that of rectangular air ducts. This is due to the significantly reduced airflow resistance and a high degree of air tightness of the spiral duct and its fittings. Therefore, when the fan is selected, the power of the supporting motor is also greatly reduced, thereby reducing the daily operating cost of the system and the one-time investment capital of the fan.
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