Aeration through runner
AssigneeVoith Hydro, Inc.
InventorsJames R. Beyer, Richard K. Fisher, Jr., Robert G. Grubb
Life of this patent
Estimating the term…
Abstract
A turbine, adaptable to enhance the levels of dissolved gas such as oxygen in water flowing therethrough, includes a rotating shaft and a runner secured to the shaft. The runner includes a crown, a band and a plurality of spaced apart runner blades. Each blade has a water directing surface defined by a pressure side, an oppositely facing suction side, a leading edge and a spaced apart trailing edge. At least one of the blades further has a first gas admission passage extending from a first gas admission aperture formed in the crown to a second gas admission aperture formed in the band. The runner further includes an interconnection passage and a gas discharge aperture formed in the band for discharging an oxygen containing gas from the band.
Claims18
A runner for a Francis turbine, comprising:
- a crown;
- a band substantially concentric with the crown;
- and
- a plurality of blades extending between the crown and the band at spaced intervals along the crown, each blade having a water directing surface defined by a pressure side, an oppositely facing suction side, a leading edge and a spaced apart trailing edge, at least one of the blades further having a first gas admission passage extending from a first gas admission aperture formed in the crown to a second gas admission aperture formed in the band;
- wherein the band includes an interconnecting passage extends from the second aperture to at least one discharge aperture formed in the band.
A runner for a Francis turbine, comprising:
- a crown;
- a band substantially concentric with the crown;
- and
- a plurality of blades extending between the crown and the band at spaced intervals along the crown, each blade having a water directing surface defined by a pressure side, an oppositely facing suction side, a leading edge and a spaced apart trailing edge, at least one of the blades farther having a gas admission passage extending from a first gas admission aperture formed in the crown to a second gas admission aperture formed in the band;
- wherein the band includes an interconnecting passage extending from the second gas admission aperture to a discharge opening formed in a bottom region of the band, and wherein the interconnecting passage comprise a shallow groove integrally formed on an outer sidewall of the band and a cover plate secured over the shallow groove, the cover plate including at least one gas discharge aperture extending therethrough for permitting gas into a gap between the band and a surrounding discharge ring.
A runner for a Francis turbine, comprising:
- a crown;
- a band substantially concentric with the crown;
- and
- a plurality of blades extending between the crown and the band at spaced intervals along the crown, each blade having a water directing surface defined by a pressure side, an oppositely facing suction side, a leading edge and a spaced apart trailing edge, at least one of the blades further having a first gas admission passage extending from a first gas admission aperture formed in the crown to a second gas admission aperture formed in the band, a blade adjacent to the at least one of the blades further having a second gas admission passage extending from a third gas admission aperture formed in the band to a plurality of discharge apertures at spaced intervals along the trailing edge of the adjacent blade;
- wherein the band includes an interconnecting passage extending from the second gas admission aperture to the third gas admission aperture.
Dependencies are inferred from the claim text.