How to arrange the air supply duct and return air duct in the clean room? -common problem
How to arrange the air supply duct and return air duct in the clean room?
After the air supply and return air outlets are arranged, the air supply and return air ducts can be arranged. Generally, the air supply duct is above and the return air duct is below; for operating rooms that use mainstream area air supply, High-efficiency air supply ceilings are generally side-inlet, in the ceiling mezzanine...
Text label: Clean room air supply duct layout, clean room return air duct layout, Zhongjing Global Purification
How to arrange the air supply duct and return air duct in the clean room?
After the air supply and return air outlets are arranged, the air supply and return air ducts can be arranged. Generally, the air supply duct is above and the return air duct is below; for operating rooms that use mainstream area air supply, The high-efficiency air supply ceiling is generally side air intake. In the ceiling interlayer, the air supply branch pipe can be set under the return air branch pipe. The size of the air duct can be determined according to the air volume and the recommended wind speed. The air speed in the air duct should be selected according to the indoor allowable noise level requirements; The wind speed of the air duct is 6-10m/s. When the wind speed is small, the noise generated is small, the required cross-section of the air duct is large, the space occupied is also large, and the initial investment is large; when the wind speed is high, the noise generated is large, and the wind The size of the pipe section can be reduced, the space occupied is also small, the height of the building can be reduced, and the initial investment is small. Therefore, when selecting the wind speed, it is necessary to take into account both the primary and secondary aspects. Generally, the wind speed of the total air duct is less than 8m/s. Well, if the wind speed in the main air duct is greater than 8m/s due to the space size, the muffler should be installed on the main branch air duct with a smaller wind speed; /s, 2-5m/s for branch pipes with air supply and return outlets.
Arranging the air supply pipes First, draw the direction of each air supply branch pipe and the position of the main air pipe with a single line. According to the air volume of each branch pipe, the position of the main air pipe, and the space size, adjust it repeatedly to make the air distribution even and smooth. In the purification air-conditioning system, when the size of the air duct is reduced in the horizontal direction, the reducing pipe should not be specially set as much as possible, and the diameter should be reduced by using a tee, a cross or an elbow, because the addition of the reducing pipe will increase the number of connecting flanges. , waste materials and increase the air leakage; when the air duct becomes smaller in the height direction, the reducing pipe should be used, and the diameter should not be reduced at the tee, cross and other pipe fittings, otherwise it is easy to leak air. The lower surface of the air duct is straight, and the upper surface is inclined downward to reduce the diameter, which is convenient for the installation of the air duct; the air flow should first flow through the regulating valve, and then enter the high-efficiency air supply port through the soft joint. If the valve and the soft joint are reversed in sequence, it will cause The inconvenience during construction and the vibration of the soft joint when adjusting the air volume; a closed control valve should be set at the inlet of each high-efficiency filter air supply port to facilitate the adjustment of the system air volume. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean rooms.
The arrangement method of the return air duct of the clean room is similar to the air supply duct. A regulating valve should be installed on the return air branch pipe connected with the return air outlet, and attention should be paid to the connection form between the return air outlet and the branch pipe; With the connection form of the return air outlet, due to the relatively large aspect ratio of the return air outlet, a static pressure box should be used to connect the return air outlet and the branch pipe. This form requires cross construction during installation, which is very inconvenient; Install the regulating valve, and its installation position is preferably at the air outlet and return air outlet of the combined purification air conditioning unit, and the valve should be installed at the branch of the main branch pipe for initial adjustment. The return air branch pipe should be installed with regulating valve to adjust the air volume and pressure difference. If a muffler needs to be installed, a micro-perforated plate muffler should be used, and it should be installed on the air supply pipe and the return air pipe. For the muffler on the air supply pipe, the wind speed in the subsequent pipe should not be greater than the wind speed in the front pipe. For the muffler on the return air pipe, the wind speed in the pipe in front of it should not be greater than the wind speed in the pipe behind it to ensure the noise reduction effect.
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