Removing the impeller of an on-site centrifugal fan – there are basically no conditions to hold the impeller in place; please design a suitable tooling
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This post was last edited by we11we11 on 2024-3-1 at 10:56. There is a centrifugal fan on site, and its motor requires bearing replacement. First, it is necessary to remove the fan’s impeller, but this presents a challenge: the impeller weighs around 100–200 kg, and figuring out how to support it during removal is a problem. 1. If the impeller is lifted from the top, since the chamber where the impeller is located is very small and there is no roof opening at the top, it is not possible to create a lifting point; the owner certainly will not agree to weld a lifting point on the top of the chamber. 2. The lower part of the air chamber is arc-shaped, matching the shape of the fan impeller; as a result, it is difficult to design a supporting fixture at the bottom of the air chamber. Designing a fixture to support the impeller on an arc-shaped surface also presents challenges, while it would be much easier if the surface were flat. Now, let’s consider how to create a fixture that can hold the impeller in place; by pulling the impeller while retracting the motor, it will be possible to remove the motor. In other words, the fixture not only needs to support the impeller but should also be able to move. I wonder if anyone has any good suggestions
The scaffolder goes in to set up a scaffold to bear the weight; the scaffold poles are too long, so they are cut shorter in a straight line once inside
Mm-hmm, thank you. Setting up a scaffold is also an option; it’s just that the internal space is too small, so I’m not sure if it will work. There are no scaffolders on site, and our maintenance team is still discussing it. If it’s feasible, we’ll apply to have scaffolders brought in
Weld two angle irons (one on each side) below the impeller, parallel to the fan, and the impeller can be removed directly
Is it welded internally? Then wouldn’t that make it fixed? I guess the owner won’t agree to do that; I still hope there will be a mobile work setup
After removing the impeller, just use a angle grinder to smooth it out – it’s impossible to tell anyone; there are no suitable special tools available and the space is too limited. We’ve been using this method for many years as it’s convenient
Okay, thank you. This can be an alternative option; it will likely require approval from the management
The outer wall of this fan is double-layered, with an insulating layer in between; it’s likely to be troublesome to install skylights as well. Most importantly, the owner probably won’t agree to making any changes to it easily