EP0122726A1 - Surfaces faisant contact avec du fluide et dispositifs les incorporant - Google Patents

Surfaces faisant contact avec du fluide et dispositifs les incorporant Download PDF

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Publication number
EP0122726A1
EP0122726A1 EP84301804A EP84301804A EP0122726A1 EP 0122726 A1 EP0122726 A1 EP 0122726A1 EP 84301804 A EP84301804 A EP 84301804A EP 84301804 A EP84301804 A EP 84301804A EP 0122726 A1 EP0122726 A1 EP 0122726A1
Authority
EP
European Patent Office
Prior art keywords
axis
fluid
impeller
propeller
contacting surface
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.)
Granted
Application number
EP84301804A
Other languages
German (de)
English (en)
Other versions
EP0122726B1 (fr
Inventor
Robert Davidson
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0122726A1 publication Critical patent/EP0122726A1/fr
Application granted granted Critical
Publication of EP0122726B1 publication Critical patent/EP0122726B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/26—Blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/181—Axial flow rotors

Definitions

  • This invention relates to fluid-contacting surfaces and devices incorporating such surfaces, and more particularly relates to fluid-contacting surfaces and devices which are arranged to affect, modify or control the flow of fluids, as for example the fluid-contacting surfaces of stationary deflectors or rotatable devices such as turbines, impellers or propellers and the like which may be used for a variety of purposes and applications e.g. as in pneumatic and hydraulic applications.
  • Another object of this invention is to provide a fluid-contacting surface and/or device incorporating at least one such surface, which may have special purpose applications and provide more effective fluid flow control than at least many conventionally formed fluid-contacting surfaces and devices.
  • a fluid-contacting surface comprises at least a part of that surface cenerated by a generating line extending radially from a point of origin on an axis and rotated about said axis from a said point of origin and radially position so asto sweep through a decreasing angle relative to the axis as rotation takes place.
  • statienary fluid deflector incorporating the fluid-contacting surface cenerated according to the preceding clair.
  • an axial flow fluid impeller or propeller incorporating at least one fluid-contacting surface generated as aforesaid.
  • the invention further includes the methods of forcing the said generating surface and the said stationary deflector and/or axial flow fluid irpeller or propeller.
  • FIG. 1 of the drawings this diagrammatically illustrates how a fluid-contacting surface in accordance with the present invention may be generated about a point or origin O of an axis of rotation %.
  • a generatrix point P defines a radius vector OP
  • transverse axis X extends at right angles to the axis of rotation 8 and the angle ⁇ is formed between the X axis and the projection OQ of the radius vector OP onto the XY plane, with the angle being formed between the radius vector OP and the XY plane.
  • the parametric equations defining the curve generated by the point P are: and Either of the augles ⁇ and z may be eliminated from the equations by expressing it as a function of the other.
  • the fluid-contacting surface in accordance with this invention is any part of that surface generated by the radius vector or generating line OP rotated about the axis a from the point of origin and swept between the transverse axis X through a decreasing angle to lie adjacent and parallel the axis Z.
  • the surface may include the full 900 sweep between the transverse axis X and the true axis of rotation Z or a part thereof, or the full 180 0 sweep from adjacent the axis Z to one side of the point of origin O through the transverse axis X to lie adjacent the axis Z at the opposite side of the point of origin O; and the surface thus formed may be duplicated or otherwise multiplied in providing a plurality of similar fluid-contacting surfaces in continuous or spaced relationship about the axis of rotation Z e.g. as in providing fluid-contacting surfaces on a twin or multi bladed impeller or propeller.
  • the angle through which the radius vector or generating line OP is swept and the angle of rotation about the axis may be unrelated or each may be a function of the other such as, for example, directly proportional, according to the use to which the fluid-contacting surface is to be put.
  • the variance in the angle through which the generating line OP is swept may be unrelated or directly proportional to the speed of rotation of the line OP about the axis Z.
  • the generating line OP can remain of constant length throughout its rotational and angular sweep relative to the axis Z, so that the said surface, and any impeller or propeller blade formed thereby or incorporating such surface, may be swept through an imaginary sphere or spheroidal form, or the length of the generating line OP can be varied as it is swept through its prescribed angle and rotated about the axis a from its point of origin O in forming a fluid-contacting surface or device incorporating such surface arranged to sweep through an alternative required form as hereinafter described.
  • the rotatable impeller or propeller may be constructed with a blade 1 formed from such as a thin sheet of metal or other suitable material in initially flat circular disc form of radius equal to the length of the generating line OP and provided with either a single radial slit S or a small sector R,R' cut out, as illustrated by way of example in figure 5 of the drawings; and the whole or part disc form may then be twisted and bent into shape with the radial slit (or sector) edges R, R' disposed in opposition 180° apart to lie on or adjacent the axis of rotation Z of the impeller or propeller.
  • the slit S between the radial edges R, R' of the blade 1 may be a width such that is is substantially equal to the diameter of an axial shaft 2 for the impeller or propeller and to which the said radial edges R,R' can be secured such as by welding.
  • Conventional screw type impellers or propellers are formed with at least the inner parts of their fluid-contacting surfaces as a true helix or substantially a true helix about the axis of rotation, with such helix being maintained perpendicular to the axis as it progresses longitudinally thereof; and many propellers are provided with a further helical twist along their radial axes towards their outer periphery.
  • the blade is simply spirally formed from one point of origin O on the axis of rotation Z so that from the one medial position on the transverse axis X where the fluid-contacting surface generating line OP is disposed perpendicular to the axis of rotation Z, either side of such perpendicular position the angle of inclination ⁇ relative to the axis Z progressively decreases as it approaches the axis of rotation a until it is positioned parallel and adjacent thereto i.e. adjacent the longitudinal surface of the axially-disposed shaft 2.
  • radial lines 3 represent equal increments of the angle ⁇ of figure 1 and the dashed lines 4 join sample points of equal displacement from the plane of the X and Y axes.
  • a twin bladed impeller or propeller is provided with a different pitch and consequential different shape formed as a result of each blade 1' being constructed from thin sheet metal initially of disc form as before but with a relatively large segment S' cut out between radial edges R and R', as shown in figure 10.
  • the blades 1' will sweep through an imaginary sphere A.
  • the invention is not confined to impellers or propellers in which the fluid-contacting surface generating line OP is constant, but by varying the length of such line (e.g. by a gradual increase to a peak followed by a gradual decrease) during formation of the impeller, or by subsequent shaping of the impeller blades once initially forced as before described, impellers or propellers of different shapes and sweeping different shaped volumes can be provided to meet the desired situations.
  • the impeller blades I' can be shaped so that on rotation a substantially cylindrical volume may be swept as indicated in chain dot outline B in figure 7, or the blades 1' may be shaped so that an ellipsoidal form C is swept by the impeller blades.
  • the basic spheroidal form may be in the main applicable to the medial part of the impeller or propeller, but segments of the sphere or spheroidal form at the opposite axial ends may be cut off, or the longitudinal axis of the impeller or propeller substantially shortened relative to the true diameter.
  • a twin bladed impeller or propeller may be provided which is substantially similar to the impeller or propeller previously described with reference to figures 6 to 10 of the drawings, except that in this arrangement whilst the two blades 1'' are similarly formed from a thin flat disc arrangement, on assembly or prior to assembly axial end portions are cut out at T to more particularly separate the blades 1'' at che shaft 2'' each side of the medial portion 1''a
  • impellers and impeller blades formed as aforedescribed in accordance with this invention have shown that in many instances and on rotation in one direction the formed impellers will give a far more concentrated axial thrust than conventional impellers or similar overall size, similarly powered, and rotated at the same revolutions.
  • the invention thus hac particular applications in the construction of small and large air circulation, cooling and ventilating fans and the like; and it is further expected that the invention will have useful applications in marine propulsion for boats and the like, and/or the impelling or pumping of various kinds of fluids, and possibly further have aeronautical applications.
  • the invention particularly lends itself to simplification of manufacture utilising sheet materials, but it will be appreciated that theinvention is not confined in this respect and that the impeller, propeller or other blades or deflectors incorporating the fluid-contacting surface or surfaces in accordance with the invention can be manufactured and formed by other means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Turbines (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP84301804A 1983-03-17 1984-03-16 Surfaces faisant contact avec du fluide et dispositifs les incorporant Expired EP0122726B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ203600A NZ203600A (en) 1983-03-17 1983-03-17 Generating a non-planar fluid working surface
NZ203600 1983-03-17

Publications (2)

Publication Number Publication Date
EP0122726A1 true EP0122726A1 (fr) 1984-10-24
EP0122726B1 EP0122726B1 (fr) 1986-07-09

Family

ID=19920280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301804A Expired EP0122726B1 (fr) 1983-03-17 1984-03-16 Surfaces faisant contact avec du fluide et dispositifs les incorporant

Country Status (8)

Country Link
EP (1) EP0122726B1 (fr)
JP (1) JPS59183001A (fr)
AU (1) AU571200B2 (fr)
CA (1) CA1229765A (fr)
DE (1) DE3460275D1 (fr)
MX (1) MX161273A (fr)
NZ (1) NZ203600A (fr)
ZA (1) ZA842009B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111498049A (zh) * 2020-04-10 2020-08-07 中船澄西扬州船舶有限公司 一种节能定子的安装方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4921404A (en) * 1984-10-12 1990-05-01 Holmberg Arnold C V Propellors for watercraft
JPS62500515A (ja) * 1984-10-12 1987-03-05 ロリモント　プロプライエタリー　リミテッド 船舶用プロペラ
WO2013115658A1 (fr) * 2012-01-31 2013-08-08 Propeller Technology Ltd Hélice

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1017915B (de) * 1955-06-02 1957-10-17 Bergedorfer Eisenwerk Ag Kreiselpumpe fuer fluessige Nahrungsmittel
FR2187030A5 (fr) * 1971-07-09 1974-01-11 Crambes Maurice

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS524940B1 (fr) * 1970-02-20 1977-02-08
FR2359294A1 (fr) * 1976-07-23 1978-02-17 Carrouset Pierre Turbine de prehension d'un fluide
NL184075B (nl) * 1978-06-30 1988-11-01 Hva Water Contractors B V Werkwijze voor het bedrijven van een om een draaiingsas draaibare rotor, alsmede rotor bestemd voor het uitvoeren van een dergelijke werkwijze.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1017915B (de) * 1955-06-02 1957-10-17 Bergedorfer Eisenwerk Ag Kreiselpumpe fuer fluessige Nahrungsmittel
FR2187030A5 (fr) * 1971-07-09 1974-01-11 Crambes Maurice

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111498049A (zh) * 2020-04-10 2020-08-07 中船澄西扬州船舶有限公司 一种节能定子的安装方法

Also Published As

Publication number Publication date
EP0122726B1 (fr) 1986-07-09
AU571200B2 (en) 1988-04-14
AU2557884A (en) 1984-09-20
CA1229765A (fr) 1987-12-01
MX161273A (es) 1990-08-27
NZ203600A (en) 1987-03-06
DE3460275D1 (en) 1986-08-14
JPS59183001A (ja) 1984-10-18
ZA842009B (en) 1984-10-31

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