HYDRAULIC MACHINE COMPRISING A RADIAL FLOW RUNNER
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United States of America Patent
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Issued Date -
Nov 19, 2020
app pub date -
Aug 9, 2018
filing date -
Aug 14, 2017
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Abstract
A hydraulic machine has a runner of the Francis type, a head cover and a lower cover. A crown has a seal that seals the space between the crown and the head cover against water from the high pressure side. The runner is formed with at least one passage that is capable to drain high pressure leakage water passing the seal to the low pressure side. The passage is formed with an inlet aperture located in a portion of the crown which during operation is exposed to high pressure leakage water. The passage is 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. The head cover is formed with an air inlet to admit air to the chamber between the head cover and the crown.
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