Xinfeng Mini-Classroom -- What Are the Common Types of Collectors Used in Corrosion-Resistant Fans?

Both the collector and the inlet box in corrosion-resistant fans are among the most critical components in their structure. Collectors are generally more common, with their primary function being to ensure the swirl symmetry at the impeller inlet.

Common collectors in corrosion-resistant fans are typically categorized into four types. What are these four types? Below is a brief yet detailed introduction to each:

1. Cylindrical Collector: Generates significant vortex flow at the impeller inlet, adversely affecting flow convergence. Connecting a duct exceeding 3-4 times the collector's straight length to its front end may slightly improve performance.

2. Conical Collector: Superior to cylindrical types but still suboptimal.

3. Arc-shaped collectors are currently widely used in corrosion-resistant fan manufacturing because the cyclone flow tends to be more stable when passing through them. Based on the vortex area generated at the inlet of the blade channel, the vortex area produced by arc-shaped collectors is smaller than that of conical collectors.

4. Cone-arc collector: First cone, then arc. This collector produces negligible vortex area at the blade inlet. For corrosion-resistant fans with high specific speed and high efficiency, the cone-arc collector is widely adopted.

The previous section detailed several collector types. Collector performance directly impacts impeller efficiency and further affects the operational state of corrosion-resistant fans.

Currently, the latter two collector types demonstrate more ideal application results, offering centrifugal fan manufacturers greater design flexibility.