The lifting and discharge of liquids by submersible pumps are achieved by the rotation of the impeller driven by the electric motor drive shaft. The selected submersible pump impeller form and material vary depending on the liquid being transported.
The materials of submersible pump impellers mainly include five categories: cast iron impellers, aluminum alloy impellers, brass impellers, stainless steel impellers, plastic impellers, etc. Neutral liquids generally require cast iron impellers, brass impellers should be used for oil, and aluminum alloy impellers, stainless steel impellers, or plastic impellers should be used for sanitary and food grade fluid materials. Corrosive liquids should be more corrosive, and brass impellers, stainless steel impellers, and plastic impellers should be selected.
There are three types of submersible pump impellers: closed, semi open, and open. Ordinary liquids without granular fibers can choose closed impellers, otherwise semi open and open impellers should be considered to facilitate the passage of liquids. Open impellers are used for liquids with larger and more granular fibers, semi open impellers are used for liquids with fewer granular fibers, and closed impellers are used for liquids without granular fibers.
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