4-72 Industrial Blower

Detail of 4-72 Industrial Blower

The 4-72 series fan is a centrifugal fan widely used in industrial and mining plants, civil buildings, large public buildings and other places. The following is a detailed introduction:

Product classification

Currently, the commonly used ones on the market are 4-72-A and 4-72-C.

Use environment conditions

Conveying medium: It should be air or non-corrosive, non-flammable, non-explosive, and non-sticky gas, and the dust and hard particles contained in the gas shall not exceed 150mg/m³.

Medium temperature: The medium temperature of the standard fan conveying does not exceed 80℃. After adding a heat dissipation wheel, it can convey the medium below 200℃ for a long time.

Use space: It cannot be used for exhaust in a completely closed space without airflow, otherwise it will form negative pressure and increase the motor load.

Product features

Good ventilation effect: Good exhaust effect, suitable for pipeline exhaust or air supply.

Strong applicability: It can be used in places without corrosive, flammable, and explosive gases.

Low noise: The impeller is designed with a reasonable angle according to air flow mechanics. There is no mechanical friction during operation, and obstacles are easy to soundproof to avoid high-frequency noise.

Smooth operation: The optimized impeller reduces the axial force to the minimum. After static and dynamic balance correction, the whole machine runs smoothly and the bearing amplitude is small.

Less maintenance and convenient: The impeller adopts a backward-inclined type, which is not easy to adhere to dust and other media. The motor adopts imported bearings. Some models are also equipped with a cleaning door, which can be maintained and cleaned without disassembling the machine.

Strong and durable: The casing and impeller are made of high-quality steel plates, and the surface is sprayed with a strong anti-oxidation coating, which is not easy to damage.

Working principle

It is mainly composed of an impeller, an air inlet, and a volute. When the impeller rotates, the air in the blade channel moves outward under the action of centrifugal force, and a vacuum is generated in the center of the impeller, so that the air is axially inhaled from the air inlet. The inhaled air turns 90° at the impeller inlet and enters the blade channel. Under the action of the blades, it obtains kinetic energy and pressure energy. The airflow thrown out from the blade channel enters the volute and is discharged from the air outlet after concentration and diversion.

Model Description

For example: 4-72 No.8C /3KW-4 right 90°, where 4-72 indicates 4-72 centrifugal fan, 4 indicates total pressure coefficient, 72 indicates specific speed, 8 indicates machine number, C indicates belt drive, 3KW indicates motor power, 4 indicates motor stage, right indicates rotation direction, and 90° indicates outlet angle.

Transmission mode

It is divided into six types: A, B, C, D, E, and F, as follows:

Type A: Direct motor connection, no bearing seat, the fan impeller is directly installed on the motor shaft.

Type B: Belt drive, the pulley is between the two bearings, and the impeller is cantilevered.

Type C: Belt drive, the pulley is cantilevered at one end of the shaft, and the impeller is cantilevered at the other end of the shaft.

Type D: Coupling drive, the impeller is cantilevered.

Type E: Belt drive, the pulley is cantilevered, and the impeller is installed between the two bearings.

Type F: Coupling drive, the impeller is installed between the two bearings.

Specification of 4-72 Industrial Blower