Installation of centrifugal fan in clean workshop
Installation of centrifugal fan in clean workshop
The main shaft of the fan in the clean pharmaceutical cleanroom should avoid collision and damage in the process of packaging, transportation and installation. Before the final assembly, it should be carefully inspected. It is required that the surface of the main shaft should not have cracks and dents; The interference of mm; the maximum deflection of the main shaft bending is not...
Text label: Clean workshop installation and construction, centrifugal fan installation
Installation of centrifugal fan in clean workshop
The main shaft of the fan in the clean pharmaceutical cleanroom should avoid collision and damage in the process of packaging, transportation and installation. Before the final assembly, it should be carefully inspected. It is required that the surface of the main shaft should not have cracks and dents; mm interference; the maximum deflection of the main shaft bending does not exceed 3/10,000 to 5/10,000 of the shaft length; after running for not less than 2 hours, the temperature rise of the sliding bearing does not exceed 35 °C, and the maximum temperature does not exceed 70 °C, The temperature rise of rolling bearing shall not exceed 40℃, and the maximum shall not exceed 80℃. When installing the centrifugal fan, first hang the casing and bearing seat on the foundation, put on the anchor bolts, straighten the casing, and not fix it temporarily; hang the combination of the impeller, the bearing box and the pulley on the foundation Put the impeller on the main shaft in the casing, put on the bearing box anchor bolts, install the cover plate of the round hole on the side of the casing, and then hoist the motor on the foundation; align the bearing box assembly. , the leveling can be placed on the pulley horizontally for inspection, the lower side can be flattened with inclined shims, and the drive shaft should be kept within the allowable deviation range; a large flat ruler can be used for alignment, and check whether the centerline of the main shaft of the fan is parallel to the centerline of the foundation. The deflection can be corrected with a crowbar.
The leveling and alignment of the casing is based on the impeller. It is required that the wall surface of the casing is parallel to the plane of the rear disc of the impeller, the center of the shaft hole of the casing is coincident with the center of the impeller, and the flange surface of the support of the casing is kept horizontal; While aligning and leveling, the bell mouth of the collector of the casing and the impeller must not rub against each other, and the clearance meets the requirements. After the impeller of the fan stops rotating, it should not stay in the original position every time; when the fan adopts the coupling shaft When the motor is driven by the fan, the motor should be leveled according to the installed fan. The leveling can be done by using the coupling. When the belt drive is used, the motor can be fixed on the two sliding The rails should be parallel to each other and fixed horizontally on the foundation. After the fan casing, the impeller bearing box joint and the motor are aligned and leveled, the anchor bolt holes can be poured with cement mortar, and cement mortar should be filled under the machine base. After the cement mortar solidifies, tighten the anchor bolts. Foot bolts shall have washers and locknuts. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean workshops and dust-free workshops.
The dynamic pressure at the air inlet and outlet of the centrifugal fan is relatively large. The larger the dynamic pressure value, the larger the local resistance. The connection between the air inlet and the air outlet of the fan has an obvious effect on the efficiency of the fan; The tuyere should be connected to the elbow along the rotation direction of the fan blade. If the site conditions allow, it is best to make the distance from the fan outlet to the elbow to be 1.5-2.5 times the long side of the fan outlet; When the road is directly connected to the atmosphere, a protective net should be installed or other safety measures should be taken; the inlet and outlet air ducts should be supported separately, and should be firmly connected to the foundation or other buildings; To prevent the deformation of the casing, the casing should not bear the quality of other base parts; in engineering construction, due to various specific circumstances or conditions, sometimes due to the use of a bad interface, a local eddy current area will be formed, which will increase the pressure loss. At this time, in order to improve the vortex area, guide vanes can be added in the elbow to reduce the pressure loss as much as possible.
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