EP0148140A2 - Rührwerk zur Belüftung von Wasserbecken - Google Patents

Rührwerk zur Belüftung von Wasserbecken Download PDF

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Publication number
EP0148140A2
EP0148140A2 EP84850375A EP84850375A EP0148140A2 EP 0148140 A2 EP0148140 A2 EP 0148140A2 EP 84850375 A EP84850375 A EP 84850375A EP 84850375 A EP84850375 A EP 84850375A EP 0148140 A2 EP0148140 A2 EP 0148140A2
Authority
EP
European Patent Office
Prior art keywords
impeller
blade
tip
towards
hub
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.)
Withdrawn
Application number
EP84850375A
Other languages
English (en)
French (fr)
Other versions
EP0148140A3 (de
Inventor
Hjalmar Fries
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.)
Xylem Water Solutions AB
Original Assignee
Flygt AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Flygt AB filed Critical Flygt AB
Publication of EP0148140A2 publication Critical patent/EP0148140A2/de
Publication of EP0148140A3 publication Critical patent/EP0148140A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades

Definitions

  • the purpose of the invention is thus to give the impeller such a shape that its tip vortexes are suppressed and replaced by a vortex pattern which gradually leaves the impeller from the hub and outwards.
  • the low pressure zone on the upper side of the impeller which normally is subject to concentration of air, is also given such a shape that impeller sections of different radii cooperate as little as possible.
  • the invention also has an impeding influence on the suction of air from the water surface. Air that is sucked in at the blade tip when it passes near the surface can not move inwards along the blade surface depending on the plane design of the impeller. This means that the impeller may be mounted near the surface and nevertheless obtain a controlled operation.
  • the results obtained are especially important at waste water plants, where the water and the sludge must be aerated and moved simultanously to avoid sedimentation.
  • the line of the lifting force for the impeller is given a backward swept extension and at the same time the blade surface is divided, preferably in the form of elliptical functions, so that the angle of the leading edge of the blade successiveively decreases relative the circumference from the hub towards the blade tip.
  • Fig 1 shows a conventional plane impeller and its typical tip vortex.
  • Fig 2 shows a backward swept impeller blade according to the invention and how its vortex pattern leaves the blade from the centre and outwards to the tip.
  • the vortex vr the vortex pattern is a result of an overflow from the underside of the blade to its upper side and depending on the relative movements of the chord elements caused by the backward sweeping, the overflow will not be concentrated to the tips.
  • mixer impellers have already been manufactured having a backward swept leading edge. These impellers have however not shown to give the above described effects as the trailing edge has not accompanied in the backward sweeping. A contineus underpressure area having a radial extension has therefore occurred on the suction side.
  • An elliptical area division which is swept backwards so that the angle between the leading edge and the circumference decreases towards the tip, gives automatically the above described geometry of the trailing edge. Small variations from the elliptical area division may be made, without any major deterioration of the wishe ⁇ results. This may be dictated from a physical point of wiew or other constructive wishes. Typical is however, that a relatively small part of the blade area is divided towards the tips and that the sesulting traction centre of the blades thus lies at around 70% of the radius. This is a known proportion in the aviation field, but has never been utilized in a self cleaning impeller for mixing.
  • a further possibility to counteract air intake at the suction side of the blade is to gradually transfer the profiles of the impeller axially, so that the tips will be situated downstream the hub. In this way even the blade area may be corrected to essentially be a tangent to a straight cylindrical impeller shaft and thus obtain a simple design.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP84850375A 1983-12-19 1984-12-04 Rührwerk zur Belüftung von Wasserbecken Withdrawn EP0148140A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8307006 1983-12-19
SE8307006A SE8307006D0 (sv) 1983-12-19 1983-12-19 Propeller for luftningsbassenger

Publications (2)

Publication Number Publication Date
EP0148140A2 true EP0148140A2 (de) 1985-07-10
EP0148140A3 EP0148140A3 (de) 1987-05-06

Family

ID=20353785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84850375A Withdrawn EP0148140A3 (de) 1983-12-19 1984-12-04 Rührwerk zur Belüftung von Wasserbecken

Country Status (2)

Country Link
EP (1) EP0148140A3 (de)
SE (1) SE8307006D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102974128A (zh) * 2012-11-28 2013-03-20 中国科学院南京土壤研究所 一种离心式搅拌萃取塔

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
No search, Declaration under Rule 45 EPC *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102974128A (zh) * 2012-11-28 2013-03-20 中国科学院南京土壤研究所 一种离心式搅拌萃取塔

Also Published As

Publication number Publication date
EP0148140A3 (de) 1987-05-06
SE8307006D0 (sv) 1983-12-19

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19841218

AK Designated contracting states

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Effective date: 19880222

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18D Application deemed to be withdrawn

Effective date: 19880705

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FRIES, HJALMAR