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Structure of the fan

Thefan mainly consists of impeller, casing inlet, Drivingand Bracket unit.

Casing: to be welded into a volute with normal steel plate.

Impeller: The fan blade is made up of 12 backward single leaf blades, which reduces the impact of the air flow, has good stability , and the motor is not easy to overload, which greatly prolongs the service life of the fan. This type of fan has high pressure coefficient, low speed and low noise, so its practicability is good. The maximum circumference speed of impeller diffuser shall not exceed 140m/s. The impeller, after being shaped, shall be balanced statically and dynamicaly and thus it guarantees a smooth operation.

Inlet: to be integrated into a convergent streamlined structure and bolted on the inlet side of fan.

Adjusting valve: a device used to regulate the flow rate of the fan, which is mounted at the front of the inlet. The adjustment range is from 0 degrees (full open) to 90 degrees (full closed). The switch position of the door is adjusted from the inlet direction to the right, and the right whirlwind machine is pulled from down to up direction from the bottom to the full open direction. For the left whirlfan , the wrench is pulled up from the top to the full open direction.

Driving unit—it consists of shaft, bearing box, rolling bearing, belt pulley or coupling.

Leakproof oil bearing box, the use of a joint type of oil ring to swing the high-speed rotating bearing oil to the inner wall of the bearing box flow back to the oil pool; In addition to convenient maintenance and preventing friction accidents, semi-open aluminum oil seal can be used to cut back some of the dilute oil along the shaft. The lateral pressure plate root blocks a small amount of dilute oil; The upper part of the bearing box is equipped with a ventilation plug to reduce the micro-positive pressure in the bearing box, ensuring no oil leakage and good dust protection performance.

Th e main shaft of the transmission part is made of high-quality steel. The fans are all rolling bearings and are lubricated with L-AN46 mechanical oil.

The fan is integrated or partitioned: the fan is disassembled and assembled into multiple components for transportation and installation.

The fan is convenient for installation and repair. The fan has two complete base shell and transmission group. The shell has a middle or vertical side. The disassembly is particularly convenient. The rotor can be lifted vertically. If only the impeller is replaced, it can also be disassembled axially.

Transmission mode: The fan is cantilever structure, convenient layout, belt wheel connection transmission, uniform transmission

Performance and selection of the fan

Performance of the fan:The performance of the fan is expressed by the parameters of fan flow, full pressure, spindle speed, shaft power and so on. Performance curve and the performance of the performance given in the table. Blower performance:200 degrees Celsius, atmospheric pressure is 101325 Pascal,Gas density is 0.745kg/m³, calculation and calculation of air medium. (Other designs are similar to the use of parameters.)

The performance of both the selection curve and the performance table refers to the performance of adjusting the blade to a full 0 degree centigrade. When ordering the performance table shall prevail. Fan performance test total pressure value of 5% of the total pressure deviation is less than design value.

Such as fan using condition does not accord with the above, the performance shall be carried out according to the related formula conversion.

When excessive or insufficient flow of processing. When use, often occur the phenomenon of excessive or insufficient flow, produce a lot of reasons for this phenomenon, if it is in use process flow occurs when small phenomenon, is mainly due to the resistance of pipe network. If it is in use process, after a long time to reduce gradually, mainly due to network congestion.

After the fan is a new installation, a formal operation occurs when the flow phenomenon of excessive or insufficient reason mainly has the following points:

1. The actual value and calculating value difference is too large in the resistance of pipelines.

By the general network characteristic equation: P = Kq2, type of K - drag coefficient.

If the actual value K is less than the calculated value K, increases the flow, if the actual value K is greater than the calculated value K, the flow decreases.

2. when the choice is not the fan itself fully considering the influence of the pressure deviation of δP, when the fan actual total pressure for positive deviation, then the flow; Negative deviation, the flow rate decreases.

Began formal operation after fan is a new installation, or in use process flow is too big or too small, one of the following methods can be used to eliminate it.

Make use of the fan speed adjusting flow increase or decrease.

Using the new high or low pressure switch to increase or decrease in flow rate of fan.

Change the pipeline resistance coefficient K to change traffic.

At this time to try to change the network reduce drag coefficient to increase traffic, also can increase the fan rotation speed and changing the high pressure fan, but speed shall not be greater than the maximum speed performance table.

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