Selection of fan for aseptic purification room
Ed Purification Da teaches you how to correctly select the fan in the purification room, which is an important condition to ensure the normal and economic operation of the ventilation system. The so-called correct selection of fans mainly refers to the selection of fans for different purposes according to the nature and use of the transported gases; the selected fans should satisfy the required air volume of the system, and the wind pressure of the fans should overcome the resistance of the system, and work within the high efficiency Zui or economic scope of use. The specific selection methods and steps are as follows:
1. According to the nature of the transported gas, the aseptic purification room chooses different kinds of fans for different purposes. For example, when conveying clean air or dusty gas through the fan, it has been purified. When the dust concentration does not exceed 148 mg/m3, the fan for general ventilation and ventilation can be selected; when conveying corrosive gas, the anti-corrosion fan should be selected; when conveying flammable, explosive gas or dusty gas, the explosion-proof fan or dust exhaust fan should be selected. However, when selecting specific fan models and specifications, it must be based on the performance table or characteristic curve of a certain type of fan product samples.
2. Considering the possibility of air leakage in pipeline system, some resistance calculation is not accurate. In order to make the fan run reliably, the air volume and pressure of the fan used in sterile purification room should be larger than that of the ventilation and dust removal system, i.e. L fan = (1.05-1.1) L (1) P fan = (1.10-1.15) P (2) fan should be selected according to the two parameters of L fan and P fan. In addition, the performance selection table or performance curve provided in the sample refers to the air in the standard state.
3. According to the air volume of the fan L'wind pressure H', the type of the fan is selected in the sterile purification room on the sample of the fan products, and the fan number, speed and motor power are determined. In order to facilitate the takeover and installation, the sterile purification room also needs to select the appropriate fan outlet location and transmission mode. The selected working point of the fan should be in the economic scope and on the right side of the Zui rate point.
4. For large and medium-sized centrifugal fans used for conveying gas, they should be installed on the basis of concrete, and for axial fans, they should be installed in the middle of the duct or in the wall tunnel. When installed in the middle of the air duct, the sterile purification room can install the fan on a bracket made of angle steel, and then fix the bracket on the wall, column or under the concrete floor. If there are special requirements for vibration isolation, the fan should be installed on the vibration absorber.
The selection of fan in sterile purification room, regarding muffling, should select high quality and low noise fan and do muffling treatment (such as adding muffler box), and also consider the treatment of sound absorption when decorating (such as using sound absorption material).
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