Low Pressure Centrifugal Fans

Low Pressure Centrifugal Fans

This low pressure centrifugal fan has high compressive strength, strong corrosion resistance, smooth surface and accurate size. It features a high-performance impeller with front grooved blades that reinforce the hub. It maintains dynamic and static stability. A gasket made of abrasive material provides protection against shaft/housing leakage, so its safety is very good.
Product description

Product introduction:

This low pressure centrifugal fan is capable of blowing air, sea air containing salt vapor, and corrosive air containing oil vapor and a small amount of acid vapor from the natural evaporation of the battery.

Product features:

1. This low pressure centrifugal fan has high compressive strength, strong corrosion resistance, smooth surface and accurate size. It features a high-performance impeller with front grooved blades that reinforce the hub. It maintains dynamic and static stability. A gasket made of abrasive material provides protection against shaft/housing leakage, so its safety is very good.

2. It is ideal for ventilation and conditioning in industrial areas, extracting stale air, steam from solvent tanks, drying and eliminating fumes and harmful gases. High-strength steel shaft with oxidation protection and two ends of the key. Rigid ball bearings for self-aligning, sealing and permanent lubrication. The low pressure centrifugal fan is equipped with a rigid motor bracket to withstand mechanical damage.

Performance and selection:

(1)The performance of fan:the performance of fan is expressed with flow rate,total pressure, shaft speed,shaft power and power parameters. The certain relationship is existed among each parameter. The relationship is listed as follow:

Converting formula for changing density, speed n:

11.jpg

Converting formula for changing speed n, atmosphere Pa, and gas temperature t:

22.jpg

Where:

Q — flow (m3/h)                                  33.jpg— density (kg/m3)
p — total pressure(Pa)                           n — speed(r/min)
P — power(kW)                                     t — temperature(℃)
η — efficiency(%)                                  Pa — atmosphere(Pa)

With footnote‘2’means known performance parameter, with footnote‘1’means unknown performance parameter.
The fan performance indicate the performance of delivered gas under standard state. The standard state means: atmosphere Pa = 101325 Pa, atmosphere temperature t=20℃, relative humidity X=50%, air density ρ=1.2 kg/m3.

The required power is calculated with the formula below:

44.jpg

Where:

Q — flow (m3/h)                        ηm — mechanical efficiency(%)
p— total pressure(Pa)                K — Storing factor of motor

η— efficiency(%)

(2)Selection of fan:the fan performance indicates the performance of the delivered gas under the standard state. When the operation condition is under the non- standard state, the performance of non- standard state must be converted into standard performance,then select fan according to the performance table.

Mechanical efficiency

Driving mode

Motor directly drive

V belt driving

ηm

1

0.95

Storing factor of motor

Shaft power(kW)

<0.5

>0.5~1

>1~2

>2~5

>5

K

1.5

1.4

1.3

1.2

1.15


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