Description

There are usually several connection methods for PP ducts

1. Insert type connection

The bayonet-type air duct is connected with the rectangular air duct, and different forms of bayonet are inserted into both ends of the air duct.

2. PP duct connection

Both ends of each pipe section are rolled into drum rods connected by bands, and one end is shrunk into a small opening. When installing, insert the small port into the large port according to the airflow direction. On the outside, fasten the drum rods at the two tube ends and connect with bolts, and the bolts are fixed and fastened to the earrings.

3. Hose connection

The hose connection is mainly used to connect the spiral air pipe and various components (such as the air outlet on the side of the static pressure box of the diffuser, etc.).

4. Insert and connect PP duct

The plug connection is mainly used for rectangular or circular duct connections. First, make the connecting pipe, and then insert the connecting pipe into the air ducts on both sides. Then, tighten it with self-tapping screws or rivets. The pp duct is economical, and the thickness of the pp duct processing board can be reduced by 10%-15% under the same diameter. It reduces costs, and the efficiency during hoisting is about twice that of a rectangular pp duct. Under the same plate thickness and pipe diameter, the strength of the pp duct is higher. On the same cross-section, the spiral duct structure has more reasonable tension and better rigidity, so it can greatly reduce noise and vibration.

Knowledge of PP duct installation.

1. The distance between the boom and the end of the cross arm is 30mm; the distance between the boom and the outside of the windpipe (the outer edge of the insulation layer) is 30mm.

2. When the length of the PP duct exceeds 20m, no less than one fixed bracket should be added. When the length of the PP duct exceeds 20m, an expansion joint should be added according to the design requirements.

3. The orientation of the channel steelhead and angle steel of the support and hanger should only have two orientations (horizontal and longitudinal) in the same area. In addition, the spacing between the duct supports and hangers should be uniform and even, and supports and hangers should be added at both ends of the elbow.

4. Insulation wooden support should be added between the air-conditioning duct hoisting pipe and the support and hanger.

5. The position of the PP duct support and hanger should be accurate and the direction should be the same. The boom should be vertical and there should be no distortion. The suspended duct and parts should be set with fixed points for placing and swinging.

6. The paint on the boom should be even and the color should be the same. After the air duct is installed, repaint the anti-rust paint.

7. During installation, leave 5cm outside of the boom; after installation, heat preservation, suppression, and other work are completed, after passing the inspection, cut the boom, and leave 2-3 buckles outside the nut.

8. The distance between the main duct hanger and the branch pipe should not be less than 200mm.