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 0.743kg/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.

 

Installation and operation of the fan

 Before installation: Check all components of the fan to see weather any thing is missed; weather the impeller rotates in the same direction as the casing; weather all components are connected tightly and weather the impeller rotates freely.

During installation: Pay attention to check the casing and any tools or goods should not be dropped and remained inside the casing. The connecting face between the support of the fan and the foundation or between pads and foundation should be tight. Adjusting should be made to joint the fan with foundation surface and to connect the fan with suction, discharge duct naturally. Forced assembling, especially, applying weight of pipes on any components of the fan isimpermissible. Also, attention shall be paid to the horizontality of the fan.

Requirement of installation:

1. Install the fan according to the position and sizes shown on the drawing. To insure high efficiency, radial and axial clearances between inlet and impeller must be guaranteed.

2. After installation, turn, with a little force, the driving rotor to see if it is over tight or touched with stationary components.

3. Commission Can only be carried out after the unit is through the final inspection.

4. In order to prevent the motor being burnt out due to overloading, the fan can only be started up and tested without loading. If the case is ok, increase the load step by step until the rated operating condition is reached. Control the current strictly during operation to prevent it exceeding the rated value.

 

 

Huashide(shandong)fan Co.，Ltd

Http:www.hsdfans.com

Add:kunmingrod.linyi.P.R.china

E-mail:17853928877@163.com

Tel: 17853928877