Medium Pressure Centrifugal Fan

Medium Pressure Centrifugal Fan

This medium pressure centrifugal fan is unaffected by airflow and is suitable for a wide range of general media pressure and pipe applications. Although a multi-blade impeller is used to clean the air, its temperature may be relatively high because the motor itself is under ambient conditions. The motor is of the standard industrial type and its protection rating is usually IP54 or IP55. It can be speed controlled by inverter drive, but usually cannot be controlled by voltage changes.
Product description

Product introduction:

This medium pressure centrifugal fan is unaffected by airflow and is suitable for a wide range of general media pressure and pipe applications. Although a multi-blade impeller is used to clean the air, its temperature may be relatively high because the motor itself is under ambient conditions. The motor is of the standard industrial type and its protection rating is usually IP54 or IP55. It can be speed controlled by inverter drive, but usually cannot be controlled by voltage changes.

Product features:

1. This medium pressure centrifugal fan is a medium and low pressure centrifugal fan. It is equipped with an efficient and low-noise rear blade impeller that allows it to run more smoothly and provide a better operating environment for the operator. It has a built-in direct coupling motor and an impeller or belt drive transmission on the shaft.

2. Medium pressure centrifugal fan has a certain temperature range. Direct coupling: If a cooling fan is installed, the maximum fluid temperature allowed is 80 ° C or 150 ° C. Belt drive transmission: If a cooling fan is installed, the maximum fluid temperature is allowed to be 90 ° C or 350 ° C.

Table 1 Non-dimensional Performance of Type 4-72 № 10 Sample Fan


1

2

3

4

5

6

φ
ψ
ψd
λ
ηin

0.1884
0.458
0.0335
0.0995
0.867

0.2051
0.452
0.0397
0.1045
0.887

0.2218
0.434
0.0465
0.1082
0.89

0.2361
0.413
0.0528
0.1106
0.882

0.25
0.39
0.0594
0.1126
0.866

0.2637
0.363
0.0663
0.1137
0.842


image011.jpg


Fig.1 Non-dimensional Performance Curve of Type 4-72 № 10 Sample Fan




The calculation formula calculating Dimensional parameter from non-dimensional parameters as follow:




11.jpg

微信图片_20181226134537

Table 2 mechanical efficiency

Driving mode

Motor directly connecting

coupling

V—belt

ηm

1

0.98

0.95

Table 3 Motor conservative factor

Shaft power kW

< 0.5

> 0.5~1

>1~2

> 2~5

> 5

K

1.5

1.4

1.3

1.2

1.15

During operation, excessive or lack flow rate is often existed. The reasons are many ones. If this phenomenon occurs during the operation, the reason may be that the drag in the pipeline is great sometime or small sometime. If the drag is successively reduced for a long time during operating or the drag is suddenly reduced in a short time, it may mainly be the pipeline to be plugged. When a fan is installed and excessive or lack flow rate is occurred during normal running,the reasons have mainly two aspects:

1. The actual and theoretic values k of resistance in pipe net is widely different. It was known normal pipe net characteristic equation: P=KQ2, if the actual value k is less than the theoretic value k, the flow rate increases; vice versa, flow rate decreases, see Fig.2.

image021.jpg

Fig 2 The relationship between pipe net characteristic and total Pressure deviation or flow rate

2. The effect of fan total pressure deviation △p have not been considered during selecting. when the actual total pressure of fan is a positive deviation, the flow rate increases, and when it is a negative deviation, the flow rate decreases.

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