1) Flange connection of air duct assembly: Flanging cake connection of air duct and flange: When connecting rectangular air duct flange, it is carried out on a flat steel plate, and the flanges at both ends are first connected to the air duct, and Make the pipe end exposed to the flange for 10m, then rive the flange and the air duct together. After riveting, use a small hammer to flang the pipe end, so that the air duct flanging is flat and close to the flange, and the width of the flanging is guaranteed. Not less than 7m. Riveting the flanged air duct to the reinforced frame according to the specification requirements, make a label, and install the air volume, air pressure and temperature measuring holes according to the design requirements, so as to avoid drilling holes due to high-altitude operations after installation, which will make the air duct deformed and difficult to repair. Flangeless connection of air duct: In the flangeless connection method of fabric air duct ventilation duct air duct, plug connection is a more commonly used form, and its construction technology is relatively mature. The insert connection of the air duct is to use various inserts formed by rolling to make the opposite connection of the air duct. It is widely used in the connection of smaller rectangular air ducts. Compared with the traditional angle steel flange connection method, the plug connection of the air duct simplifies the cumbersome construction process, saves steel and man-hours, and effectively improves the production efficiency. According to the specification, the applicable scope of this connection method is the rectangular air duct with a large side and a side length of 120-630m. The upper and lower large sides of the air duct are connected by S-shaped inserts, and the left and right small sides of the air duct are connected by C-shaped inserts. Production of S-shaped cuttings: The cutting width of the S-shaped cuttings is 9lm. After cutting, the strips are fed from the feeding end of the middle roller of the 'YS 10' S-shaped cutting machine, and passed through seven sets of rolling wheels. Continuous rolling deformation, the semi-finished workpiece in the shape of 'Figure 1' comes out of the discharge end, and then the switch is turned to the right, so that the rolling wheel is reversed to feed the semi-finished workpiece from the feeding end of the outer series, and the rolling wheel passes in turn. Gradually deformed, and the finished workpiece comes out from the other end. Insertion connection of the air duct: When the S-shaped insert is used alone, the vent edge of the ventilation project can be directly connected to the insert. When used in combination with C-type inserts, reserve 2*(9~10)*180 at both ends of the C-type inserts. The length of the flanging. The two ends of the S-shaped inserts are reserved with no less than 2×(15~20) of flat plugs. When connecting and assembling, first insert the upper and lower horizontal inserts of the air duct, and then insert the vertical inserts, and after the insert is in place , Bend the 'tongue' and stick it on the inserted horizontal strip. (2) Installation of ventilation ducts and components Whether the size of the hole, the elevation and the position of the calibration support and hanger meet the requirements. The spacing between the hangers is 3m, and for pipes less than 3m long, one hanger is installed at each end. The thermal insulation duct is to prevent the occurrence of cold bridges. Add dunnage between the air duct and the hanger, and the thickness of the dunnage is the same as that of the insulation layer. There should be no less than one bracket per layer of the vertical air duct, and no less than 2 brackets when the floor height is greater than 4m. The air duct passes through the floor bracket. See the figure below: Before the air duct is installed, it must be pre-assembled and inspected to pass the inspection before it can be installed in place in the order of writing. The flange packing is based on the design regulations. The tightness of the connection, the 8501 rubber strip must form a closed line, and there must be no gaps. The flange is connected to the elbow, and the nut connecting the flange is located on the same side. Before installing the air duct and components, remove the dust and dirt inside and outside the duct , Seal both ends with polyethylene film, keep the inside of the pipe clean, and clean the air duct and its parts that are sealed and packaged, and must not be disassembled before installation. The detachable interface of the accessories is not allowed to be installed in the wall hole or floor, and the dunnage is installed between the hanger and the air duct. The installation direction of the muffler should be correct, and it should not be damaged or damp. Its weight is borne by the air duct. Before installing the fire damper, check whether its model and position meet the design requirements and whether there is a product qualification certificate. The fusible sheet of the fire valve should be installed in the direction of the airflow. Install the system after installation, do the action test after installation, and set up a separate bracket when installing the fire damper. Install the exhaust valve, exhaust port and manual control device (including pre-embedded duct) according to the position required by the design. After the exhaust valve is installed Do the action test to check whether the manual and electric operation is sensitive and reliable, and whether the valve body is closed tightly. The length of the hose is 100mm, and the length of the hose on the positive pressure side is 150mm. When installing the air outlet, ensure that the air outlet and the air duct are connected tightly and firmly; Deformation, flexible adjustment. Vibration and noise prevention during installation Vibration and noise prevention is a key point in the installation process. The prevention of vibration and noise of the air duct during the installation process mainly starts from the following aspects: Air conditioning units, fans and wind turbines The installation of the soft joints connected by the pipes should be properly tight, so as to avoid noise and vibration caused by reducing the area of u200bu200bthe air inlet and outlet due to the loose connection. , A fixed bracket shall be provided at the connection with the air-conditioning equipment and the air outlet.
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