Centrifugal fan is a kind of ventilator that uses high-speed rotating impeller to accelerate the gas and then change the flow direction to convert kinetic energy into potential energy. It is often used in various industrial production and ventilation systems in public places. Users will see various centrifugal fans before choosing. Fan codes, such as D type, E type, etc., these actually represent the transmission mode of the off-type fan. How many transmission modes are there for the centrifugal fan?
1. Motor direct-connected centrifugal fan
As the name implies, the transmission mode of this centrifugal fan is that the impeller is directly installed on the motor shaft, that is, the A-type centrifugal fan, which is a cantilever shaft transmission structure. The speed of the fan is the same as that of the motor. It is suitable for small fans and has a compact structure. , the body is small.
2) Belt drive centrifugal fan
This centrifugal fan is driven by a belt and a pulley and is divided into three types: B, C, and E.
1. Type B centrifugal fan
The B-type centrifugal fan is a cantilever belt drive structure, and the pulley is installed between two supporting bearing housings. It is suitable for medium-sized and variable-speed centrifugal fans.
2. Type C centrifugal fan
The C-type centrifugal fan is also a cantilever belt drive structure like the B-type. The difference is that the installation position of the pulley is on the outside of the two supporting bearing seats. It is suitable for medium-sized and variable-speed centrifugal fans, and the pulley can be disassembled and replaced. And maintenance is more convenient.
3. E-type centrifugal fan
The two supporting bearing seats of the E-type centrifugal fan are on both sides of the centrifugal fan casing, that is, the impeller is in the middle of the two supporting bearing seats, which is a double supporting type, and the pulley is installed on one side of the fan, which is suitable for double suction or large The centrifugal fan with single suction and variable speed has the advantage of relatively stable operation.
3) Coupling drive centrifugal fan
The motor and fan of this kind of centrifugal fan are connected and driven by a coupling, and are divided into two types, D and F, with slightly different structures.
1. D-type centrifugal fan
The D-type centrifugal fan is also a cantilever centrifugal fan, but it uses a coupling to connect the main shaft of the fan and the motor. The coupling is installed on the outside of the two supporting bearing seats. The speed of the fan is the same as that of the motor. It is suitable for medium-sized and above centrifugal fan.
2. F-type centrifugal fan
The F-type centrifugal fan is a transmission structure that uses a coupling to connect the fan and the motor shaft, but the two supporting bearings are installed on both sides of the casing, which is a double-supporting form, and the coupling is installed on the outside of a bearing seat. It is suitable for double-suction or large-scale single-suction centrifugal fans with the same speed as the motor, and its advantage is that the operation is relatively stable.