Backward-Curved Blade Blowers

Backward-Curved Blade Blowers These blowers are used when a higher discharge pressure is needed. It is used over a wide range of applications. Both the forward and backward curved blades do have much higher stresses than the radial bladed blower. 

Centrifugal Blowers These blowers have air or gases entering in the axial direction and being discharged in the radial direction. These blowers have three types of blades radial or straight blades, forward-curved blades, and backward-curved blades (Figs. 10-84 to 10-86). 

Figure 9.12 Forward curved and backward curved blades on a centrifugal blower.

Radial blade blowers as seen in Fig. 10-68 are usually used in large-diameter or high-temperature applications. The blades being radial in direction have very low stresses as compared to the backward or forward curve blades. The rotors have anywhere between 4 to 12 blades and usually operate at low speeds. These fans are used in exhaust work especially for gases at high temperature and with suspensions in the flow stream. 

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