Plates, profiles and other major finished products used in the operation and installation of ventilation ducts shall conform to the provisions of the current national standards for design and related products, and shall be checked and accepted according to the current relevant national standards when materials enter the field with the application of the certificate of qualifications for factory inspection。
Ventilation pipeline is a municipal infrastructure for air circulation and reducing the concentration of harmful gases. Ventilation pipes, sheets, profiles and other major finished materials used in the operation and installation of air ducts shall conform to the provisions of the current national standards for design and related products, and shall be inspected and accepted according to the current relevant national standards when materials enter the field. Ventilation pipes are classified according to material: steel plate air duct (common steel plate), galvanized sheet (white iron) air duct, stainless steel air duct, FRP air duct, plastic air duct, composite material air duct, color steel sandwich heat preservation board air duct, double-sided aluminum foil heat preservation air duct, single-sided color steel heat preservation air duct, rubber coated air duct (such as mine air duct), mine plastic air duct, etc.
Generally, when connecting spiral ducts, the incision should be tightly and firmly rectangular ducts with positioning and sealing measures at the four corners. The air duct connection should be flat and not distorted or distorted. How many ways do spiral ducts usually connect?
I. Plug Connection
The insert type is connected to the rectangular air duct connection and inserts different forms of inserts into both ends of the air duct.
2. Hoop connection
The two ends of each pipe segment are rolled into drum bars, and one end is shrunk into a small opening. When installed, the small opening is inserted into the big opening according to the direction of airflow. The drum bars at the two ends are tightly connected by steel tow hoops and fixed and tightened by bolts in the earrings.
3. Hose connection.
The hose connection is mainly used for connecting spiral air duct with components (such as the side air outlet of the static pressure box of the diffuser), and the two ends of the soft arm are sleeved outside the connecting tube。
IV. Pipe-and-socket Connection
Plug-in connection is mainly used for rectangular or circular air duct connection. Firstly, the connecting pipe is made, then inserted into both sides of the air duct, then fixed tightly with self-tapping screw or pulling willow nail, and the hose is tightened with special soft clamp. The helical duct is economical. Under the same diameter, the thickness of the plate processed by the helical duct can be reduced by 10%-15%. The utility model can reduce the cost and is about twice as efficient as the rectangular air duct in hoisting. Under the same thickness and diameter, the strength of spiral duct is higher. Under the same cross-section, the structural tension of the spiral duct is more reasonable and the rigidity is better, so the noise and vibration can be greatly reduced.
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