4-79/B4-79/F4-79 General/Explosion proof/Anti corrosion Medium and High Pressure Industrial Centrifugal Fans

1. Purpose:

4-79 typeCentrifugal ventilation fanIt can be used for indoor ventilation and air exchange in general factories and large buildings. Transport air and other non self igniting, harmless to human health, and non corrosive gases to steel. The B4-79 fan can be used for ventilation and exchange of flammable and volatile gases. There shall be no viscous substances, dust or hard particles in the gas, with a concentration not exceeding 150mg/m3. The gas temperature shall not exceed 80 ℃.

The performance, selected components, and foundation dimensions of B4-79 fan are consistent with those of 4-79 fan, and can be selected according to its sample.

The F4-79 fan is made of stainless steel and fiberglass materials for transporting corrosive gases, and its performance and foundation size are the same as those of the 4-79 type.

2. Form

When viewed from the side of the electric motor, if the impeller rotates clockwise, it is called a right cyclone machine, represented by "right"; if the impeller rotates counterclockwise, it is called a left cyclone machine, represented by "left".

The outlet position of the fan is represented by the angle of the air outlet of the casing. 4-79 type fans No.3-6The adjustment range of the air outlet position is 0 ° -225 °; The interval is 45 °, and the transmission mode is A-type transmission; NO.7~20 air outlet positions are 0 °, 90 °, and 180 °,The transmission mode of NO.7~12 is C-type or E-type transmission,The transmission mode of NO.14-20 is E-type transmission,NO.2X5~2X20The air outlet positions are 0 °, 90 °, and 180 °, and the transmission mode is E-type transmission.

3. Structural characteristics

The NO.3~6 in the 4-79 type fan are mainly composed of impellers, casings, inlet air and other parts matched with direct connected motors. NO.7~20 and NO.2X5~2X20In addition to the above-mentioned parts, there are also transmission parts, etc.

(1) The impeller consists of 16 backward inclined circular arc blades, a curved front plate, and a flat rear plate. Steel plate manufacturing, with dynamic and static balance correction, has good air performance, high efficiency, and smooth operation.

(2) The casing is made of steel plate and processed into an Archimedean spiral shape using a CNC laser cutting machinevolute，After welding, the casing is made into two different types.NO.3~12reachNO.2X5~2X12The casing is made as a whole and cannot be disassembled,NO.14~20 andNO.2X14~2X20The casing can be made into a two-piece design, divided into two halves along the horizontal plane and connected by bolts.

(3) The air inlet is made as a whole and installed on the side of the fan. The cross-section parallel to the axial direction is curved, which allows gas to enter the impeller smoothly with minimal loss.

(4) The transmission part consists of a main shaft, bearing housing, rolling bearings, pulleys or couplings.