FULID MACHINE OF THE FRANCIS TURBINE TYPE WITH A SEALING PORTION FEATURING A GROOVE WITH A DEFINED CROSS SECTIONAL SHAPE

• Main Authors: KAWAJIRI, HIDEYUKI, NAKAGAWA, NARITOSHI
• Format: Patent
• Language: English
• Published: 21.12.2012
• Subjects: BLASTING; CLEANING; CLEANING IN GENERAL; CYLINDERS; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MACHINES OR ENGINES FOR LIQUIDS; MECHANICAL ENGINEERING; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; PISTONS; PREVENTION OF FOULING IN GENERAL; PRODUCING MECHANICAL POWER; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; SEALINGS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS

Disclosed is a Francis Turbine type fluid machine. The machine includes a sealing portion which is formed of an annular minute gap formed between a runner band of a runner configuring a rotating portion and a sealing liner which is a stationary portion and arranged in opposition to the runner band. The machine has a groove having a quadrangular cross-sectional shape which is formed circumferentially on a surface of the sealing liner configuring the sealing portion. In a cross section perpendicular to a groove forming direction of the groove, an angle, which is formed between a side of the groove on the most upstream side with respect to the flowing direction of the leakage flow, and a side of the groove which is on an extended line of the surface of the sealing liner, is determined to be between 15 degree and 40 degree .