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How to fabricate and install PIR Pre-insulated duct system Part Four

How to fabricate and install PIR Pre-insulated duct system Part Four

2022-11-15

How to fabricate and install PIR Pre-insulated duct system Part Four

Using a pre-insulated duct CNC cutting machine will definitely improve your duct making efficiency. A pre-insulated duct CNC cutting machine is a computerized cutting machine that cuts fast and accurately.

Attentions

1. The non-insulation air duct should be strengthened if the length of the large side is greater than 1200mm, and the size of the reinforcing strip is 18×40mm; if the length of the large side is greater than 1600, and the length of the small side is greater than 600mm, the inner wall of the connecting line of the air duct should be pasted with special glue with a width of 40mm. Two layers of glass cloth.

2. Super-large air ducts with side lengths greater than 3000mm for thermal insulation air ducts. In addition to the strengthening measures, 5×50mm angle irons are installed on the outer wall of the air duct to strengthen every 1.3 meters, which are connected with the screw rod of the reinforcing column. The strength of the arm (the cross arm and the boom must be treated with anti-rust treatment, and the air duct with the wind pressure less than 1500pa does not need to be used).

High-pressure air ducts with wind pressure greater than 1500pa, super-large air ducts with side lengths greater than 3000mm. In addition to the reinforcement measures for large air ducts, 50×50mm angle steel is installed on the outer wall of the air duct every 1.3m. The air duct with the side length of the screw connection of the reinforcing column greater than 2000mm is also reinforced with angle steel.


How to make expansion joints.

Setting expansion joints is a scientific solution to the physical phenomenon caused by wet expansion and dry contraction of air ducts. When the straight length of the air duct reaches and exceeds 20mm, set expansion joints every 20m. The expansion joints are made of air duct plates of the same thickness. The connecting air ducts at the expansion joints are set to leave a gap of 5-10mm, and the width of the expansion joints is 300mm, and the width of the expansion joints is set on the outer surface of the air duct. The inner dimension of the expansion joint is 3-4mm larger than the outer dimension of the air duct. The gap with the outer wall of the air duct is about 2mm, and the expansion type sealing material is filled.

When the installation of the air duct encounters the settlement (expansion) joint of a large building, a 250mm length of soft joint should be set at the settlement.

The connection between the air duct and the air valve and the air exhaust.

For the connection between the air duct and the air valve, the two ends of the air valve are made into a plug-in type. The outer diameter of the air valve socket is equal to the inner diameter of the air duct, the insertion length is 50mm, and it is fixed with self-tapping screws. As a temporary solution, flange connection can also be used. One side of the special flange is inserted into the air duct wall, and the other side is connected with the flange of the valve.

The connection between the air duct and the air exhaust is to connect one end of the air duct to the interface of the air exhaust with a soft joint. The connection is to put the joint on the air duct for about 7-8cm, then press it with white iron and use a Zigong every 15cm. Fastened with screws. A temporary solution can be flanged.

The connection between the air duct and the fan adopts a soft connection.

Make a rectangular box out of duct panels. Cut a circular opening on the side connected to the fan, and connect it with the fan with a canvas soft joint. The other side is made into an interface corresponding to the size of the air duct, and is bonded to the air duct.

If you want to make a Tianyuan place, make a reducer first according to the diameter of the fan and the length of the connected duct. Then cut off the four corners of the air duct at the end of the reducing pipe and the fan, splicing multiple air duct plates into a garden, and then use the air duct plate to cut into a garden flange of the size corresponding to the fan as a template, and then use glass cloth, After the special glue is cured in the garden mouth to make the flange, take off the template to become the Tianyuan place.

Using a pre-insulated duct CNC cutting machine will definitely improve your duct making efficiency. A pre-insulated duct CNC cutting machine is a computerized cutting machine that cuts fast and accurately.


pre insulated duct


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