Draft tube of hydraulic machinery

Draft tube of hydraulic machinery

A draft tube (2) of hydraulic machinery according to the present invention suppresses generation of a horseshoe vortex in a junction of the upstream-side end (4) of the pier (3) and the inner wall of the draft tube (2) and reduces energy loss in the draft tube (2). The draft tube of hydraulic machin...

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Hauptverfasser: SHINGAI, KENJI, NOMOTO, SATORU, TANI, KIYOHITO
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BLASTING
HEATING
LIGHTING
MACHINES OR ENGINES FOR LIQUIDS
MECHANICAL ENGINEERING
OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
PRODUCING MECHANICAL POWER
WEAPONS
WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
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creator SHINGAI, KENJI
NOMOTO, SATORU
TANI, KIYOHITO
description A draft tube (2) of hydraulic machinery according to the present invention suppresses generation of a horseshoe vortex in a junction of the upstream-side end (4) of the pier (3) and the inner wall of the draft tube (2) and reduces energy loss in the draft tube (2). The draft tube of hydraulic machinery includes a water-flow control part (30, 31 or 32) suppressing generation of stagnation on the upstream side of the junction. Preferably, the water-flow control part is formed such that the angle between the upstream-side end of the pier (3) and an upper surface of the water-flow control part (30, 31 or 32) is equal to or greater than 90° in a plane including a cross-section of the pier (3) viewed from a side surface of the draft tube. Preferably, the water-flow control part (30, 31 or 32)is formed such that the length from the inner wall of the draft tube (2) to the surface of the water-flow control part (30, 31 or 32) along an extended line of the upstream-side end (4) of the pier (3) toward the inner wall is equal to 0.1D or more, where D denotes the maximum thickness of the pier.
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The draft tube of hydraulic machinery includes a water-flow control part (30, 31 or 32) suppressing generation of stagnation on the upstream side of the junction. Preferably, the water-flow control part is formed such that the angle between the upstream-side end of the pier (3) and an upper surface of the water-flow control part (30, 31 or 32) is equal to or greater than 90° in a plane including a cross-section of the pier (3) viewed from a side surface of the draft tube. Preferably, the water-flow control part (30, 31 or 32)is formed such that the length from the inner wall of the draft tube (2) to the surface of the water-flow control part (30, 31 or 32) along an extended line of the upstream-side end (4) of the pier (3) toward the inner wall is equal to 0.1D or more, where D denotes the maximum thickness of the pier.</description><language>eng ; fre ; ger</language><subject>BLASTING ; HEATING ; LIGHTING ; MACHINES OR ENGINES FOR LIQUIDS ; MECHANICAL ENGINEERING ; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR ; PRODUCING MECHANICAL POWER ; WEAPONS ; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS</subject><creationdate>2009</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=20090729&amp;DB=EPODOC&amp;CC=EP&amp;NR=2083168A2$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=20090729&amp;DB=EPODOC&amp;CC=EP&amp;NR=2083168A2$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>SHINGAI, KENJI</creatorcontrib><creatorcontrib>NOMOTO, SATORU</creatorcontrib><creatorcontrib>TANI, KIYOHITO</creatorcontrib><title>Draft tube of hydraulic machinery</title><description>A draft tube (2) of hydraulic machinery according to the present invention suppresses generation of a horseshoe vortex in a junction of the upstream-side end (4) of the pier (3) and the inner wall of the draft tube (2) and reduces energy loss in the draft tube (2). The draft tube of hydraulic machinery includes a water-flow control part (30, 31 or 32) suppressing generation of stagnation on the upstream side of the junction. Preferably, the water-flow control part is formed such that the angle between the upstream-side end of the pier (3) and an upper surface of the water-flow control part (30, 31 or 32) is equal to or greater than 90° in a plane including a cross-section of the pier (3) viewed from a side surface of the draft tube. 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The draft tube of hydraulic machinery includes a water-flow control part (30, 31 or 32) suppressing generation of stagnation on the upstream side of the junction. Preferably, the water-flow control part is formed such that the angle between the upstream-side end of the pier (3) and an upper surface of the water-flow control part (30, 31 or 32) is equal to or greater than 90° in a plane including a cross-section of the pier (3) viewed from a side surface of the draft tube. Preferably, the water-flow control part (30, 31 or 32)is formed such that the length from the inner wall of the draft tube (2) to the surface of the water-flow control part (30, 31 or 32) along an extended line of the upstream-side end (4) of the pier (3) toward the inner wall is equal to 0.1D or more, where D denotes the maximum thickness of the pier.</abstract><oa>free_for_read</oa></addata></record>
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subjects BLASTING
HEATING
LIGHTING
MACHINES OR ENGINES FOR LIQUIDS
MECHANICAL ENGINEERING
OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
PRODUCING MECHANICAL POWER
WEAPONS
WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
title Draft tube of hydraulic machinery
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