Self-cleaning screw-type centrifugal wheel pump with recirculation behind the impeller
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United States of America Patent
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Jul 18, 2017
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app pub date -
Nov 24, 2011
filing date -
Nov 24, 2010
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Abstract
The screw-type centrifugal wheel pump includes a pump housing and a screw-type centrifugal wheel arranged rotatably within the pump housing and having a hub and a blade, and comprises a rotatable drive shaft connected to the screw-type centrifugal wheel, and includes a cover plate arranged between the screw-type centrifugal wheel and a housing rear wall, wherein the cover plate has a central opening through which the hub or the drive shaft runs, and wherein an interior space is formed between the cover plate and the housing rear wall, wherein a gap is formed between the central opening of the cover plate and the hub or the drive shaft, which gap is connected in fluid-conducting fashion to the interior space, wherein the cover plate has at least one aperture, which is arranged spaced apart from the central opening, in order to generate a fluid flow which flows into the interior space via the aperture and out of the interior space again via the gap.
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