At present, a flat elliptical wind pipe can be adopted to reduce the occupied space height of the air pipe, and the flat elliptical wind pipe is a special device for the spiral wind, and the circular wind pipe is processed into a flat ellipse through the stretching and drawing and shaping.
The spiral wind pipe manufacturing is highly automated, faster production, general air pipe per minute can produce 20 to 40 meters, because of its raw materials compared to galvanized steel and galvanized steel sheet, the price is low, the factory production specifications and standard plus, makes the spiral duct cost to pipe lower than the rectangular wind; also because of the support and hanger needs less installation work less, so the total cost of the lower spiral duct
The spiral wind pipe has good tightness and little leakage. Through the test of various series of pressure, the spiral pipe section can not leak, this is the rectangular wind pipe can not do.
Due to the limitation of the dimension of the steel plate, a pair of flanges should be set up every two meters, and the flange joint is the easiest to leak. The length of the spiral wind pipe can be set according to the needs of the user, thereby reducing the connection of the wind pipe and reducing the leakage point.
Furthermore, the spiral air duct can be made of no blue connection, thus reducing the leakage rate and reducing the daily operating cost and energy consumption.
The four corners of a rectangular duct is easy to produce turbulence, reducing the effective flow area, the spiral air flow duct, the effective flow area is large, so the spiral duct two low noise, due to spiral wind strength, so the wind pipe smaller low frequency noise caused by vibration, air flow performance well, the system pressure drop small, daily operation of system power consumption.