Low pressure centrifugal fan 4-68 series-Fornitore globale

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204 National Highway, No. 3 Jiuhua Avenue, Jiuhua Town, Rugao, Nantong City, Jiangsu Province

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Low pressure centrifugal fan 4-68 series

1、 The working principle of the 4-68 series low-pressure centrifugal fan is based on the principle of converting kinetic energy into potential energy.

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1、 Working principle

Low pressure centrifugal fan 4-68 seriesIt is based on the principle of converting kinetic energy into potential energy, using a high-speed rotating impeller to accelerate gas, then decelerate and change the flow direction, converting kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, gas enters the impeller from the axial direction, changes to the radial direction as it flows through the impeller, and then enters the diffuser. In the diffuser, the gas changes its flow direction and the cross-sectional area of the pipeline increases, which slows down the airflow. This deceleration effect converts kinetic energy into pressure energy. The increase in pressure mainly occurs in the impeller, followed by the expansion process. In multi-stage centrifugal fans, a reflux device is used to direct the airflow into the next impeller, generating higher pressure.Purpose:Can be used to eliminate liquid containing gases; Industrial plant exhaust; Explosion proof exhaust; Exhaust system for spray painting workshops in the automotive industry; Dust removal in the electronics industry; Blast in the steel industry; Nuclear power generation; Petrochemical industry;

The working principle of the 4-68 series low-pressure centrifugal fan is basically the same as that of a turbo compressor. Both are due to the low gas flow rate and small pressure changes, and generally do not need to consider changes in gas specific volume, treating gas as an incompressible fluid.

2、 Type and structure

The 4-68 series low-pressure centrifugal fan can be made in two types: right-handed and left-handed. From one side of the electric motor, when the impeller rotates clockwise, it is called a right rotating fan; The counterclockwise rotation of the impeller is called a left rotating fan.
Construction
The 4-68 series low-pressure centrifugal fan is composed of a casing, a main shaft, an impeller, a bearing transmission mechanism, and a motor.
Chassis: Made of steel plate, it is sturdy and reliable, and can be divided into integral and semi open types. The semi open type is easy to maintain.
Impeller: composed of blades, curved front plate, and flat rear plate.
Rotor: It should undergo static and dynamic balancing to ensure smooth rotation and good performance.

Transmission part: composed of main shaft, bearing box, rolling bearings, and pulley (or coupling)

3、 Specifications

Airflow range: 1100-24000 meters³/h
Wind pressure range: 200-3900 Pa
Drive mode: belt (C/E), direct connection (A/D)

Machine number: 2.8^#～20^#

4、 Installation matters

1. The installation of the centrifugal fan unit as a whole should be directly placed on the foundation and leveled with paired diagonal pads.
2. The cutting surface on the base of the centrifugal fan assembled on site should be properly protected and should not be corroded or operated. When the base is placed on the foundation, paired diagonal pads should be used to level it.
3. The bearing seat and base should be tightly connected, and the longitudinal non levelness should not exceed 0.2/1000. The horizontal non levelness should not exceed 0.3/1000 when measured on the main shaft with a spirit level. The horizontal non levelness should not exceed 0.3/1000 when measured on the horizontal split of the bearing seat with a spirit level.
4. Before grinding and scraping the bearing shell, the rotor axis line and the casing axis line should be calibrated, and the gap between the impeller and the air inlet, as well as the gap between the main shaft and the rear plate shaft hole of the casing, should be adjusted to comply with the technical specifications of the equipment.
5. When assembling the main shaft and bearing, inspection should be carried out according to the technical specifications of the equipment. The interference fit between the bearing cover and the bearing shell should be maintained at 0.03-0.04 millimeters (measure the outer diameter of the bearing shell and the inner diameter of the bearing seat).
6. When assembling the fan casing, the position of the casing should be aligned based on the rotor axis line, and the axial and radial clearances between the impeller inlet and the casing inlet should be adjusted to the range specified in the equipment technical documents at high speed. At the same time, the anchor bolts should be checked for tightness. When the clearance value is not specified in the equipment technical documents, the axial clearance should generally be 1/100 of the outer diameter of the impeller, and the radial clearance should be evenly distributed, with a value of 1.5/1000 to 3/1000 of the outer diameter of the impeller (the smaller outer diameter is taken as the larger value). When adjusting, strive for a smaller gap value to improve the efficiency of the fan.
7. When aligning the fan, the different axial degrees between the fan shaft and the motor shaft should not exceed 0.05 millimeters for radial positioning and 0.2 millimeters for inclination.
8. The centrifugal fan assembled with rolling bearings has different axial degrees of the bearing holes on the two bearing frames, which can be determined by the flexibility of rotation after the rotor is installed.

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