DE572865C - Rimless blades for centrifugal machines in drippable liquids - Google Patents

Rimless blades for centrifugal machines in drippable liquids

Info

Publication number
DE572865C
DE572865C DEV27961D DEV0027961D DE572865C DE 572865 C DE572865 C DE 572865C DE V27961 D DEV27961 D DE V27961D DE V0027961 D DEV0027961 D DE V0027961D DE 572865 C DE572865 C DE 572865C
Authority
DE
Germany
Prior art keywords
blades
rimless
liquids
drippable
centrifugal machines
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEV27961D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
Publication date
Priority to DEV27961D priority Critical patent/DE572865C/en
Application granted granted Critical
Publication of DE572865C publication Critical patent/DE572865C/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
    • F03B11/04—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator for diminishing cavitation or vibration, e.g. balancing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Außenkranzlose Schaufeln für Kreiselmaschinen in tropfbaren Flüssigkeiten Am Rand von auß.enkranzlosen Kreiselmaschinenscbaufeln entsteht infolge des Druckausgleiches durch den Spalt zwischen Schaufel und Gehäuse .eine Verminderung der Querkraft gegenüber den Innenpartien der Schaufeln, die nach der Tragflügeltheorie in unmittelbarer Nähe der Unterdruckseite der Schaufel gemäß. Abb. i einen induzierten Randwirbel erzeugt. Wegen der hohen Rotationsgeschwindigkeiten in demselben und des in der Regel sehr geringen absoluten statischen Druckes- auf der Schaufelsaugseite entstehen in diesem Wirbel und in dessen Umgebung leicht Hohlraumbildungen (Kavitationserscheinungen). Infolge der bekannten schädlichen Wirkung dieser Hohlraumbildung werden die Schaufelteile, die in der nächsten Umgebung des Wirbels liegen und in Abb. i mit Kreuzschraffur kenntlich gemacht sind, besonders leicht korrodiert.Outer rimless blades for centrifugal machines in dripping liquids Pressure equalization occurs at the edge of the outer rimless rotor blades due to the gap between the blade and the housing. a reduction in the transverse force compared to the inner parts of the blades, which, according to the wing theory, are in the immediate vicinity Near the vacuum side of the bucket according to. Fig. I an induced tip vortex generated. Because of the high speeds of rotation in the same and in the Usually there is very little absolute static pressure on the blade suction side In this vortex and in its vicinity, cavitation easily forms (cavitation phenomena). As a result of the known harmful effect of this cavity formation, the blade parts, which are in the immediate vicinity of the vortex and in Fig. i with cross-hatching are identified, particularly easily corroded.

Die Erfindung besteht nun darin, daß man durch Anbiingung eines Steges oder einer Rippe nach Abb.2 auf der Saugseitenkante der Schaufel den gefährlichen induzierten Randwirbel von der gefährdeten Schaufelfläche weg in das Innere der Flüssigkeit verlegt und dadurch unschädlich macht.The invention now consists in that by attaching a web or a rib as shown in Fig. 2 on the suction side edge of the blade the dangerous induced tip vortices away from the endangered blade surface into the interior of the Liquid misplaced and thus rendered harmless.

Die Abb.2 und 3 zeigen Ausführungsbeispiele des Erfindungsgedankens. Die beabsichtigte Wirkung wird durch Anbringung eines Steges erreicht, wobei es gleichgültig ist, ob Schaufel und Steg aus einem Stück bestehen oder ob letzterer nachträglich beispielsweise durch Aufschweißen angebracht wird, wie dies in Abb. 3 angedeutet ist.Figures 2 and 3 show embodiments of the inventive concept. The intended effect is achieved by attaching a bar, whereby it It is irrelevant whether the blade and the bridge are made of one piece or whether the latter is subsequently attached, for example by welding, as shown in Fig. 3 is indicated.

Um auch noch die bei .höheren Gefällen durch Strahlablösung entstehende schädliche Hohlraumbildung im Schaufelspalt von der Form der Abb. i bis 3 zu vermeiden, muß die Schaufelstirnfläche entsprechend der Abb. q. so gestaltet werden, daß. an keiner Stelle innerhalb des Spaltes Ablösungserscheinungen auftreten können.In addition to those that occur due to jet detachment at higher slopes to avoid damaging cavities in the blade gap of the shape shown in Figs. i to 3, the front face of the blade must correspond to Fig. q. be designed so that. at no signs of detachment can occur within the gap.

Claims (1)

PATENTANSPRUCH'. Außenkranzlose Schaufeln für Kreiselmaschinen in tropfbaren Flüssigkeiten, dadurch gekennzeichnet, daß. entlang dem Rand der Schaufel auf deren Saugseite ein Steg oder eine Rippe angebracht ist.PATENT CLAIM '. Outer rimless blades for centrifugal machines in drip liquids, characterized in that. along the edge of the shovel on the suction side of which a web or a rib is attached.
DEV27961D Rimless blades for centrifugal machines in drippable liquids Expired DE572865C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEV27961D DE572865C (en) Rimless blades for centrifugal machines in drippable liquids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV27961D DE572865C (en) Rimless blades for centrifugal machines in drippable liquids

Publications (1)

Publication Number Publication Date
DE572865C true DE572865C (en) 1933-03-24

Family

ID=7583794

Family Applications (1)

Application Number Title Priority Date Filing Date
DEV27961D Expired DE572865C (en) Rimless blades for centrifugal machines in drippable liquids

Country Status (1)

Country Link
DE (1) DE572865C (en)

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