| 摘要 |
The present pump is applied in electroplating principally for evacuating vessels which contain copper and nickel baths, irrespective of their dimensions. Because of undesired metal deposits from the liquid, the shaft driven by the motor is introduced into the pump housing with the interposition of an isolating gap which must, however, continually be filled with liquid in order to rule out access of air to the interior of the pump housing. The isolating gap is extended so far with respect to the vessel to be evacuated that its overflow is situated above the highest possible liquid level in the vessel. In the case of spacious vessels, it still operates perfectly as a submersible pump even if the liquid level drops away over the pump housing to the bottom. In the case of vessel dimensions that are too small, it is connected outside at the bottom drain of the vessel, and after being appropriately mounted it evacuates the vessel almost completely during the start-up.
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