Centrifugal fan can be divided into forward inclined centrifugal fan and backward inclined centrifugal fan. Different structures determine different performance and application.

Composition and application of forward inclined centrifugal fan:

This series of fans is composed of external rotor motor, plastic or metal front bending impeller and plastic or metal volute. It has the characteristics of compact structure, small volume, light weight, convenient installation and use, etc.

Application: it is suitable for forced ventilation of automatic control devices and electronic equipment, indoor pipeline dust removal, exhaust, heat removal, environmental protection, air purification and pollution control.

Composition and application of backward inclined centrifugal fan:

The fan is composed of external rotor asynchronous motor and plastic / aluminum impeller. The motor has the unique advantages of ventilation, heat dissipation and self cooling. So as to prolong the service life and reliability of the fan. The fan is a backward curved impeller, which has the characteristics of compact structure, large air volume, high static pressure, low vibration, low noise, convenient installation and so on.

Application: it is mainly used for supporting refrigeration equipment such as purification workbench, purification unit, ventilation pipe dust removal, purification air conditioning system, environmental protection and pollution control.

Forward inclined and backward inclined centrifugal fans mainly refer to the blades of the fan. The forward inclined type is generally called blower and the backward inclined type is generally called induced draft fan. The difference is the length of impeller rung and impeller edge

The forward tilt is parallel to the edge of the impeller, and the impeller outlet angle is greater than 90 degrees. The forward tilt impeller is also known as the forward tilt impeller. The forward tilt impeller is mostly high-pressure. The backward inclined impeller is not parallel to the impeller, and the difference between the length and the impeller edge is a few centimeters or a few millimeters, which means that the outlet angle of the impeller is less than 90 degrees. The backward inclined impeller is also known as the backward inclined impeller. The backward inclined impeller is mainly medium pressure.

There are three main differences

① Power

The static pressure head used to overcome the system resistance, the forward inclined centrifugal fan is smaller than the backward inclined centrifugal fan. Because the channel in the backward inclined blade fan is gradually expanded, and the bending degree of the backward inclined blade is smaller than that of the forward inclined blade, its hydraulic loss is less than that of the forward inclined blade. The efficiency of forward inclined centrifugal fan is lower than that of backward inclined centrifugal fan.

② Energy consumption

As the efficiency of forward inclined centrifugal fan is lower than that of backward inclined centrifugal fan, its power consumption is greater than that of backward inclined centrifugal fan.

③ Noise

The air flow of the forward inclined blade has a large loss in energy conversion, the collision speed between the air flow and the casing is large, and the curvature of the channel of the backward inclined blade is gentle. Therefore, the operation noise of the forward inclined centrifugal fan is greater than that of the backward inclined centrifugal fan.

Successful application cases

The forward inclined centrifugal fan plays the role of heat dissipation in the cabinet. Large air volume will enhance the heat dissipation effect of the fan on the cabinet. The fan has long service life, extremely low noise level and high power density. They are used to move places with large air volume in a narrow space. According to the aerodynamic and geometric requirements, the impeller adopts single inlet or double inlet configuration. The fan ensures the heat dissipation of the cabinet and makes the equipment operate more stably.