EP2532579A1 - Propeller mit demontierbaren Blättern - Google Patents

Propeller mit demontierbaren Blättern Download PDF

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Publication number
EP2532579A1
EP2532579A1 EP20120004358 EP12004358A EP2532579A1 EP 2532579 A1 EP2532579 A1 EP 2532579A1 EP 20120004358 EP20120004358 EP 20120004358 EP 12004358 A EP12004358 A EP 12004358A EP 2532579 A1 EP2532579 A1 EP 2532579A1
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EP
European Patent Office
Prior art keywords
hub
blade
connecting member
blades
propeller
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
EP20120004358
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English (en)
French (fr)
Other versions
EP2532579B1 (de
Inventor
Mehmet Nevres Ülgen
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.)
UELGEN, MEHMET, NEVRES
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Individual
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Publication date
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Publication of EP2532579A1 publication Critical patent/EP2532579A1/de
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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
    • B63H1/20—Hubs; Blade connections

Definitions

  • the present invention relates to a vessel propeller having demountable blades.
  • propellers The propulsion required for the movement of marine vessels sailing afloat such as boats, ships and under water such as submarines is provided by propellers.
  • Propellers in general, consist of a central hub and plurality of blades combined with the hub.
  • the surfaces of the propeller blades are generally helicoidal and the flowing water is caught by the leading edge of the blade and compressed on the helicoidal surface to form a pressure and then it accelerates over the blade and leaves from the trailing edge.
  • the course of the fluid on blade surface, and hence the water compression on blade surface affect the amount of thrust to be obtained.
  • Propellers are conventionally cast in one piece and produced after being machined.
  • the blades are integrally produced with the hub.
  • This structure has some disadvantages: For example, blades, in general, are not allowed to overlap for the removal of the propellers from the cast mold, and for the surface machining after molding; and therefore such blades can get slightly higher than surface area ratio 1:1, generally being under value of 1 (e.g. 0,950).
  • Another disadvantage of the known propellers is that in case one of the blades is damaged due to mechanical fatigue, external impacts, or some other reasons, the entire propeller needs to be replaced.
  • blades must be provided along hub thickness (i.e. along the axis of the hub) in order to obtain maximum thrust from the blades arranged radially around the hub. Production cost of such a complicated structure is high, since a detailed planning before and during operation is required; moreover, huge benches or machine tracks are needed so as to meet the size of the entire propeller.
  • US 4930987 discloses a propeller with demountable blades.
  • the blades are in fact integrally connected to the hub having a dismountable structure each piece of which is integrated with a blade.
  • the disadvantage of the propeller disclosed in US 4,930,987 is that, when one of the blades is to be replaced, the hub needs to be replaced partially, as well. Thus, this necessity leads to the loss of hub material, apart from blade material.
  • US 3764228 discloses a propeller with replaceable blades.
  • the hub is disintegrated and each blade is integrated to these hub parts.
  • the hub needs to be replaced partially as well.
  • the object of the present invention is to provide a propeller having demountable blades, with an increased connection rigidity and efficiency.
  • the present invention relates to a vessel propeller comprising a cylindrical hub rotatable about a rotation axis and a plurality of blades provided radially around the hub with a certain pitch angle.
  • the propeller is characterized in that the hub comprises a blade connection housing helically formed on the cylindrical surface of the hub for the demountable connection of each blade to the hub; each blade comprises a hub connector to be placed in the respective connection housing; and plurality of external connecting members extending axially along the hub thickness for rigidly connecting the hub and plurality of blades.
  • connection of blades to the hub is preferably achieved by means of bolts or nuts. Therefore, holes formed axially along the hub thickness around rotation axis of the hub are provided in order for the bolts to pass therethrough. Similarly, hub connectors are provided with holes in order for the bolts to pass therethrough.
  • the curve of the blade connection housings formed helically on the external cylindrical surface of the hub is formed such that the same connecting member can be used for connecting two consecutive blades to the hub, when it is passed axially through the hub.
  • a blade is connected to the hub by means of multiple connecting members.
  • the propeller (1) comprises a hub (2) having a cylindrical form and rotatable around a rotation axis by means of a shaft (not shown) coupled to an engine (not shown); and blades (3) arranged radially around the said hub (2) with a certain pitch angle.
  • a shaft fitting cavity (10) In the middle of the hub (2) there is provided a shaft fitting cavity (10), into which the shaft mounted.
  • Each blade (3) is rigidly connected to the hub in a demountable manner by means of connecting members (6). Therefore, a plurality of longitudinal blade connection housings (4) are formed on external cylindrical surface of the hub (2), in the same number as that of blades.
  • blade connection housings (4) are arranged along the longitudinal direction of the hub (2) from one end to another, and on the external surface of the hub (2) in helix form. In this case, each housing (4) extends such that it will make a helix angle (14) with respect to the longitudinal direction of the hub.
  • Each blade (3) comprises a hub connector (5) mounted to the respective housing (4).
  • the hub connectors (5) are arranged at the edge (12) of the blade connecting with the hub (2).
  • the hub connectors (5) are structured in protrusion form in proximity of the leading edge (16) of the blade (3), preferably right underside of it.
  • the hub connector (5) can be produced together with the blade (3), i.e. in one piece, alternatively, it can be produced individually and fixed to joining edge (12) of blade with the hub (2) by welding, for example.
  • the geometric form of the blade connection housings (4) provides a perfect match with the external geometric form of the connectors (5); thus, the outer form of the connectors (5) perfectly fits in the inner form of the housings (4).
  • joining edge (12) of blade with the hub provided on the blade connector (5) perfectly fits on joining surfaces (13) of hub with the blade surrounding blade connection housings (4).
  • These joining surfaces (13) of hub with the blade are formed such that a slight recess is formed on the external cylindrical surface of the hub.
  • Each hub connector (5) comprises a plurality of connecting member openings (8) provided along the width of the respective connector, the openings (8) being away from one another. These openings (8) extend parallel to the longitudinal axis of the hub (2). According to the preferred embodiment of the invention, the number of openings (8) of each hub connector is three; and these are provided along the longitudinal direction of the connectors (5), one in front, another in the middle, and the other in the rear part.
  • connecting member holes (7) which are circularly arranged around hub rotation axis and which extend along hub thickness (15) in the inner wall of the hub (2) are provided.
  • the continuity of connecting member holes (7) along hub thickness (15) is interrupted by the housings (4). That is, longitudinal axis of the connecting member holes (7) passes through the housing cavity.
  • the distance of connecting member holes (7) from the axis of the hub (2) and their radial locations with respect to hub axis are arranged such that each connecting member opening (8) fits in the corresponding connecting member hole (7) in the housing (4), when connectors (5) are fitted in the housings (4) in the hub (2).
  • each connecting member (6) contributes to the fastening of more than one blade (3) to the hub (2).
  • the blade connection housings (4) are helically opened on the outer surface of the hub (2), consecutive housings (4) at least partially overlap along the axial direction.
  • at least one connecting member hole (7) of the consecutive housings (4) is co-axially provided in the same direction.
  • a connecting member used for fastening a blade in a housing is also used for fastening another blade to the hub (2) in a subsequent housing.
  • the same connecting member (6) passes through the connecting member hole in front part of a housing and through the connecting member hole in the rear part of a subsequent housing increases the rigidity of blade-hub connection.
  • the connecting member (6) providing the fastening of the blade by passing through the hole in front part of the housing supports the leading edge (16) of the respective blade
  • the connecting member (6) providing the fastening of the blade by passing through the hole at the rear part of the housing supports the trailing edge (17) of the respective blade.
  • the connecting member (6) used for connecting the blades (3) to the hub is a bolt (with a cylindrical straight body and with screw and nut at its end), and the mechanical rigidity of the said bolt connection is provided by a corresponding nut.
  • Some other external connecting member known in the art can be used instead of bolt, e.g. a stud etc.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP12004358.3A 2011-06-10 2012-06-08 Propeller mit demontierbaren Blättern Active EP2532579B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TR201105698 2011-06-10

Publications (2)

Publication Number Publication Date
EP2532579A1 true EP2532579A1 (de) 2012-12-12
EP2532579B1 EP2532579B1 (de) 2015-08-26

Family

ID=46319536

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12004358.3A Active EP2532579B1 (de) 2011-06-10 2012-06-08 Propeller mit demontierbaren Blättern

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EP (1) EP2532579B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103482047A (zh) * 2013-10-09 2014-01-01 中国船舶重工集团公司第七0四研究所 桨叶分离螺距微调式四叶螺旋桨

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE160524C (de) * 1900-01-01
US1122925A (en) 1914-02-14 1914-12-29 August F Henrichsen Propeller for boats.
US3764228A (en) 1971-10-04 1973-10-09 F Shook Replaceable blade propeller assembly
FR2184660A1 (de) * 1972-05-12 1973-12-28 Gen Signal Corp
US4150921A (en) * 1977-07-28 1979-04-24 Propulsion Systems, Inc. Built-up marine propellers with adjustable pitch and axially removable blades
US4930987A (en) 1989-05-24 1990-06-05 Brad Stahl Marine propeller and hub assembly of plastic
EP0894708A2 (de) * 1997-07-28 1999-02-03 FÜRSTLICH HOHENZOLLERNSCHE WERKE LAUCHERTHAL GMBH & CO. Propeller- oder Turbinenrad und Verfahren zur Herstellung desselben

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE160524C (de) * 1900-01-01
US1122925A (en) 1914-02-14 1914-12-29 August F Henrichsen Propeller for boats.
US3764228A (en) 1971-10-04 1973-10-09 F Shook Replaceable blade propeller assembly
FR2184660A1 (de) * 1972-05-12 1973-12-28 Gen Signal Corp
US4150921A (en) * 1977-07-28 1979-04-24 Propulsion Systems, Inc. Built-up marine propellers with adjustable pitch and axially removable blades
US4930987A (en) 1989-05-24 1990-06-05 Brad Stahl Marine propeller and hub assembly of plastic
EP0894708A2 (de) * 1997-07-28 1999-02-03 FÜRSTLICH HOHENZOLLERNSCHE WERKE LAUCHERTHAL GMBH & CO. Propeller- oder Turbinenrad und Verfahren zur Herstellung desselben

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103482047A (zh) * 2013-10-09 2014-01-01 中国船舶重工集团公司第七0四研究所 桨叶分离螺距微调式四叶螺旋桨
CN103482047B (zh) * 2013-10-09 2015-10-28 中国船舶重工集团公司第七0四研究所 桨叶分离螺距微调式四叶螺旋桨

Also Published As

Publication number Publication date
EP2532579B1 (de) 2015-08-26

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