Shandong Keheng Intelligent Equipment Co., Ltd
Ventilation is something we need to do often in our lives, and it is also very important for our lives. Ventilation is needed at home or in a small area because it is necessary to ensure the circulation of air and it is also a necessary thing that can make people maintain their lives. Ventilation should be done in the pipeline because the blockage will have a great impact, and even bring a lot of unnecessary trouble to our lives. Speaking of ventilation ducts is our best helper and can solve many problems for us. Because of its goodness, the state has also made relevant regulations for the duct flange standard . I believe that through the following introduction, everyone will understand the duct flange standard .
Duct flange introduction
The duct flange is a device used for the connection between the air ducts. Since it is a connecting device, it is of course necessary to use it with a duct. The air duct is divided into a round air duct and a Rectangular Air Duct. Of course, the corresponding air duct flange is also divided into a round shape and a rectangular shape. Due to the different materials used in the wind pipe flange, there are slight requirements for various aspects of the flange. s difference.
Duct flange size
When the air duct is a circular steel sheet air duct, the diameter is ≤140, the flange material is flat steel, its size is -20×4; when the diameter is within 150-280, the flange material is flat steel. , Specifications for the -25 × 4; Its diameter is 300-500, the material used in Finland is angle steel, specifications for the L25 × 3; diameter in the 530-1250, the flange material is angle steel, specifications for the L30 × 4; diameter in In 1320-2000, the flange material is angle steel and the specification is L40×4.
The duct is a rectangular sheet steel duct. When the side length is ≤ 630, the material used for the flange is angle steel and the specification is L25×3. When the maximum length is 800-1250, the flange material uses angle steel and the specification is L30×3; the maximum length is within 1600-2000, and the flange material is angle steel with the specification of L40×4.
For round or rectangular air ducts using stainless steel as material, the diameter or maximum length is ≤ 280, the flange material is stainless steel, the specification is -25×4, the diameter is within 320-560, and the flange material is stainless steel. , Specifications for the -30 × 4; diameter in the 630-1000, the flange material is stainless steel, specifications for -35 × 4; diameter within 1120-2000, the flange material is stainless steel, specifications for the -40 × 4.
When the material of the air duct is a round or rectangular air duct made of aluminum, the diameter is ≤ 280, the material used for the flange is angle steel, the specification is L30×4, the diameter is within 320-560, and the flange material is angle steel. For L35 × 4; diameter in the 630-1000, the flange material is flat aluminum, specifications for the -40 × 10.
Duct flange standard
The criterion of the duct flange is also a suitable dimension of the flange in the duct, since only the proper fitting of the components can achieve true ventilation. There are also many different types of duct flanges. The most common problem at the time of purchase is insulation or general insulation. The main difference between the models is the degree of nozzles, the difference between the thickness of the outer wall and the outer wall. The model without data also has a corresponding duct to match. It is only necessary to be very careful in the selection. This is also a challenge. Because duct flange is a relatively professional thing, it involves a lot of data and professional terms when it comes to processing. Therefore, when faced with such problems in life, it is recommended that you Do some preparation.
Duct flange connection
1), flange gasket material. Use airtight, dust-free and elastic materials. Flange gaskets should minimize joints. Joints should be ladder-shaped or groove-shaped. Joints should be coated with sealant. The litter between the flanges should meet the design requirements.
2) When the flange is connected, first pad the material as required, then align the two flanges first, put on a few bolts and put on the nuts, do not tighten. Then insert into the screw hole of the unbolted bolt with a sharp punch, and straighten the two screw holes until all the bolts are put on and tighten the bolt. When tightening the bolt, tighten it evenly and evenly. After the air duct is connected, take the flanges at both ends as the standard. Pull the cable to check whether the air duct connection is straight.
3) The flange bolts of the stainless steel air duct should be made of stainless steel of the same material. If ordinary carbon steel is used, the paint should be sprayed according to the design requirements.
4) The aluminum plate wind pipe flange connection should use galvanized bolts and galvanized gaskets on both sides of the flange.
5) Non-metallic wind pipe connection Both flange faces should be parallel and tight, and galvanized gaskets should be added on both sides of the flange bolts; when the composite material wind pipe is flanged, measures should be taken to prevent cold bridges.
6) The bolts connecting the flanges should be tightened evenly and their nuts should be on the same side.
Duct can not be connected
l), socket-type duct connection: suitable for rectangular or round duct connection. First make the connecting pipe, then insert the air ducts on both sides, and then tightly fix it with self-tapping bolts or rivets. The joints around the air pipes should be the same around, no obvious bends or folds; the inner sealant should be complete. The sticky sealing tape should be firmly and completely free of defects.
2) The wind pipe connection in the form of thin steel plate flange: The spacing of the spring cuttings, spring clips or fastening bolts should not exceed 150 mm, and the distribution is even and there is no loosening phenomenon.
3), cutting strip duct connection: suitable for Rectangular Duct, the connection of the board surface should be flat, no significant bending.
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