Uses
1. The main purpose of 4-72 centrifugal fans is to ventilate or transport air and other non-spontaneous, non-explosive, non-volatile, harmless to the human body, and non-corrosive to steel for indoor ventilation of general factories and large buildings; B4-72 centrifugal fans can exhaust flammable and volatile gases; F4-72 centrifugal fans are mainly used to transport corrosive gases. However, the gases transported by 4-72, B4-72, and F4-72 centrifugal fans must not contain sticky substances, and the dust and hard particles contained must not exceed 150mg/m³, and the gas temperature must not exceed 80℃.
2. The performance, optional parts, and foundation dimensions of the B4-72 fan are consistent with those of the 4-72 fan, and can be selected according to its sample. The fan structure is basically the same as that of the 4-72 type. The 2.8A~6A type uses the B35 type motor with flange and foot. The 6~12C, D type motors use the YB series corresponding to the Y series in the table, and the installation type is B3.
3. The F4-72 type centrifugal fan is made of stainless steel, fiberglass or other corrosion-resistant materials. Its performance and foundation size are the same as those of the 4-72 type centrifugal fan.
4. The 4-72 type centrifugal fan is the earliest fan used in my country, but it is also the most commonly used fan. From high-rise buildings to subways, from boiler blasting to factory ventilation, from the northern border to the coast of the South China Sea, from the western plateau to the eastern border, the 4-72 type fan can be seen everywhere.
Type TYPE
1. When viewed from one end of the motor, any fan with a clockwise impeller is called a “right-hand fan” and is represented by “right”. Otherwise, it is called a “left-hand fan” and is represented by “left”.
2. The air outlet position of the fan is represented by the air outlet angle of the casing. 4-72 fans No. 2.8 ~ 6 are all made into one type when leaving the factory. The user unit can install it to the required position according to the requirements. It is not necessary to indicate it when ordering. Among them: No. 2.8 outlet position adjustment range is 0°～ 225°, interval is 45°; No. 3.2 ～ 6 outlet adjustment range is 0°～ 225°, interval is 22.5°; No. 8 ～ 12 outlet adjustment range is 0°～ 225°, interval is 45°; No. 16, 20 outlet angles are made into three fixed 0°, 90°, 180°, cannot be adjusted, please indicate when ordering.
3. There are four types of fan transmission modes: A, B, C, and D: Among the 4-72 type fans, No. 2.8 ～ 5 adopt A transmission, No. 6 has both A and C transmission, No. 8 ～ 12 adopts C and D transmission, and No. 16 ～ 20 adopts B transmission.
If the above machine number, transmission mode, and outlet angle cannot meet your production needs, our factory has the ability to modify or design for you until you are satisfied.
STRUCTURE
4-72 type centrifugal fan No. 2.8A ~ 6A is mainly composed of impeller, casing, air inlet, motor and other parts. No. 6C and No. 8 ~ 20 have the above structure and transmission parts.
① Impeller – It is composed of 10 backward-inclined airfoil blades, curved wheel cover and flat rear disc, made of steel plate (B4-72 is made of cast aluminum alloy), and has been subjected to dynamic and static balance correction and overspeed operation test. It has high efficiency, stable and reliable operation, and good air performance.
② Casing – It is made into two different types, among which: No. 2.8 ~ 12 casing is made as a whole and cannot be disassembled. №16～20 The casing is made into a three-open type. In addition to being divided into two halves horizontally, the upper half is divided into two halves vertically along the center line and connected by bolts to facilitate the insertion or removal of the impeller during installation and maintenance.
③ Air inlet – Made into an integral structure, installed on one side of the fan, the cross section parallel to the axial direction is a curved shape, which allows the air flow to enter the impeller smoothly with less loss.
④ Transmission – Consists of a main shaft, bearing box, rolling bearing, pulley or coupling.
Ordering instructions: When ordering, the fan number, air volume, pressure, air outlet angle, rotation direction, and motor model power, speed, etc. must be specified.
