Hydraulic machine comprising a radial flow runner
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United States of America Patent
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Mar 23, 2021
Grant Date -
Nov 14, 2019
app pub date -
Jul 24, 2019
filing date -
Jan 24, 2017
priority date (Note) -
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Abstract
A hydraulic machine including a runner of Francis type, a head cover and a lower cover, the runner includes a low and a high pressure side, a crown, a band, and a plurality of blades, the crown having a sealing element to seal the space between the crown and head cover against water from the high-pressure side, whereas the runner has at least one passage to drain high-pressure leakage water passing the sealing element to the low-pressure side, and the passage has an inlet aperture located in a portion of the crown which during operation is exposed to high-pressure leakage water, the passage being located within one of the blades and leads from the inlet aperture to the band, where the passage forms an opening leading to the space between the band and the lower cover.
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