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※ 4-2 72 double suction centrifugal fan
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4-2  72 double suction centrifugal fan
Product introduction :

The 4-72 centrifugal fan can be used for indoor ventilation and ventilation of general factories and large buildings, transporting air and other unnatural, harmless to humans and non-corrosive gases to steel. B4-72 fan can be used for ventilation of flammable volatile gas. No viscous substances are allowed in the gas, and the dust and hard particles are not more than 150mg / m3. The gas temperature must not exceed 80 C. The 4-72 centrifugal fan is the earliest fan in China, but it is also the most common fan. From high-rise buildings to underground railways, from boiler blast to plant ventilation, 4-72 fans can be seen everywhere.

The type is viewed from the side of the motor. The clockwise rotation of the impeller is called a right-handed fan, and the clockwise rotation of the impeller is called a left-handed fan.
The outlet position of the fan is expressed by the outlet angle of the casing. The 4-72 fan N02.8 ~ 6 are made into a type when leaving the factory, and the user unit is reinstalled into the required position according to requirements, and it is not necessary to specify when booking the loan. Among them, the adjustment range of N02.8 air outlet position is 0 ~ 225 , with an interval of 22.5 ; the adjustment range of N08 ~ 12 air outlet position is 0 ~ 225 , with an interval of 45 ; the positions of N016 and 20 air outlets are made fixed There are three types of 0 , 90 , and 180 , which cannot be adjusted. Please specify when booking.
There are four types of fan transmission methods: A, B, C, and D. Among 4-72 type fans, N02.8 ~ 6 use A type drive, N08 ~ 12 use C, D type drive, and N016 ~ 20 use B type drive.


structure
The 4-72 fan N02.8 ~ 6 is mainly composed of impeller, casing, air inlet, motor and other parts. In addition to the above parts, N08 ~ 20 also has a transmission part.
Impeller: It consists of 10 backward tilting airfoil blades, curved front disc and flat back disc. It is made of steel plate type cast aluminum alloy (4-72 steel plate, B4-72 cast aluminum, F4-72 stainless steel or glass steel, etc. Corrosion-resistant material), and radial and static balance correction, good air performance, high efficiency and smooth operation.
Chassis: made of two different types. The N02.8 ~ 12 case is made as a whole and cannot be disassembled. The N016 ~ 20 case is made of three-open type, except that it is divided into two halves along the mid-level horizontal plane, and the upper half is divided into two halves along the center line. , Bolted.
Air inlet: It is made as a whole, installed on the side of the fan, and its cross section parallel to the axial direction has a curved shape. The function is to allow the air flow to enter the impeller smoothly, and the loss is small.
Transmission: It consists of main shaft, bearing box, roller bearing, pulley or coupling.


Impurities in the gas: No viscous substances are allowed in the gas, and the dust and hard particles contained in it are not more than 150 mg / m3. Temperature of the gas: must not exceed 80oC
Main models: 2.8A 3.2A 3.6A 4A 4.5A 5A 6A 6C 8C 10C 12C 6D 8D 10D 12D 16B 20B

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