IE53509B1 - A ship's propellor having two or more perforated hollow blades - Google Patents

A ship's propellor having two or more perforated hollow blades

Info

Publication number
IE53509B1
IE53509B1 IE2759/82A IE275982A IE53509B1 IE 53509 B1 IE53509 B1 IE 53509B1 IE 2759/82 A IE2759/82 A IE 2759/82A IE 275982 A IE275982 A IE 275982A IE 53509 B1 IE53509 B1 IE 53509B1
Authority
IE
Ireland
Prior art keywords
propellor
ship
hub
passage
blade
Prior art date
Application number
IE2759/82A
Other versions
IE822759L (en
Original Assignee
Wolfard & Wessels B V
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 Wolfard & Wessels B V filed Critical Wolfard & Wessels B V
Publication of IE822759L publication Critical patent/IE822759L/en
Publication of IE53509B1 publication Critical patent/IE53509B1/en

Links

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
    • 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
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
    • C02F3/207—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors with axial thrust propellers
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Microbiology (AREA)
  • Organic Chemistry (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Combustion & Propulsion (AREA)
  • Hydrology & Water Resources (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Catching Or Destruction (AREA)
  • Toys (AREA)
  • Wind Motors (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Screw Conveyors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

Each blade 1 has perforations 2 on the lee side thereof and is connected via a passage 4 through the hub 3 with the thrust side of the propellor. This arrangement, which during rotation of the propellor causes water to flow from the thrust side of the propellor via the passage in the hub to the hollow space in the corresponding blade and thence via the perforations to the region at the lee side of the propellor, has been found to improve the propellor's efficiency in operation in a ship's propulsion mechanism.

Description

This invention relates to a ship's propellor having two or more hollow, perforated blades mounted on a hub having a passage therein.
Netherlands patent application no.-76.01422 discloses 5 a ship's propeller comprising hollow blades mounted around a hub, which blades are provided with perforations either on the thrust side or on the suction or lee ?ide, and further each communicate via a corresponding passage provided in the hub with the drive shaft around which the hub is mounted, which shaft is also hollow. The hollow shaft - 3 is further connected to a source of gaseous, liquid or powdered material.
With such a propeller forming part of the propulsion mechanism of a ship, rotation of the propellor is S effective, either from excess pressure or a suction action originating from the rotating propellor, to cause the above-mentioned material to be transported via the hollow shaft and the passages provided in the' hub to the hollow propellor blades, and to flow subsequently via the per10 forations into the ambient water to be dispersed therein.
It is an aim of the present invention to provide a ship's propellor of the construction described in the opening paragraph of the specification with improved efficiency with regard to the propulsion mechanism.
The invention is accordingly directed to a ship's propellor of the said construction in which each hollow blade is perforated .at the lee side thereof with the space within the blade being connected via a passage through the hub to an opening on the thrust side region of the propellor.
During rotation of the propellor, which is mounted on a normal solid shaft through which no materials are admitted to the hollow portions of the propellor blades during rotation, water flows from the region at the thrust side of the propellor via the passage through the hub to the hollow space in the corresponding propellor blade and thence via the perforations to the region at the lee - 4 side of the propel lor. It has been found that this water recycling is accompanied by a considerable improvement of the efficiency of the propellor's operation which depends on the rate of rotation and is noticeable from fuel consumption, the ship's velocity, and tractive power, Xn one embodiment of the propeller according to the invention, and one which is advantageous for the improvement in efficiency of the propellor's operation, each passage through the hub at the thrust side of the propellor is directed substantially parallel to the axis of rotation.
In an effective embodiment, the perforations at the lee side of the propellor blades are provided parallel to and, as viewed in the direction of rotation of the propellor, just behind the tractrix. It is conceded that such a feature is known per se from British Patent Specification No. 2 059 788 A. That, however, concerns a propellor with which a gaseous, powdered or liguid material is dispersed in a liguid using imploding cavities. The present invention, on the other hand, relates to a propellor serving for the propulsion of a ship.
It has been experimentally determined by means of a ship in practice that, under comparable conditions, a propellor according to the invention, which had three blades, resulted in a considerable improvement in propulsion efficiency as compared with an identical propellor but without perforations in the blades and without the presence of a passage in the propellor's hub. The improvement in - 5 efficiency under the selected test conditions depended on the rate of rotation of the propellor in the sense that after passing through a maximum the efficiency decreased when the speed was Increased further. In the range of 250 - 350 r.p.m. measured by the ship's velocity an improvement of approximately 8 - 6% could be'determined with the propellor according to the invention; measured by the tractive force an improvement of about 39 - 16»; and when fuel consumption was calculated as a function of the ship's velocity the propellor according to the invention exhibited an improvement relative to the normal propellor of about 7 to 8» on average.
One embodiment of the ship's propellor according to the invention will now be described, by way of example, with reference to the accompanying drawing, which shows an axial view of the propellor according to the invention from the lee side thereof.
In the drawing, 1 designates a hollow propellor blade which is provided with perforations 2 parallel to the tractrix 5. The propellor blade is connected to a hub 3 provided with a passage 4, which connects the thrust side region of the propellor with the hollow space of the propellor blade.
Naturally the ship's propellor as described hereinbefore and shown in the drawing can be modified without departing from the scope of the invention. Thus the shape and the number of the perforations, the shape of the cavity in a propellor blade, and the shape end dimensions of the passage through the hub can be adapted in order to reduce flow resistance for the water, being recycled.

Claims (4)

1. A ship's propellor comprising two or more hollow perforated blades mounted on a hub having a passage therein, in which each hollow blade is perforated at the lee side thereof with the space within the blade being connected via a passage through the hub to an opening on the thrust side region of the propellor.
2. A propellor according to claim 1, in which each passage through the hub at the thrust side of the propellor is directed substantially parallel to the axis of rotation.
3. A propellor according to claim 1 or claim 2, in which the perforations are disposed parallel to, and, as viewed in the direction of rotation of the propellor, just behind, the tractrix.
4. A ship's propellor substantially as described herein with reference to the accompanying drawing.
IE2759/82A 1981-11-20 1982-11-19 A ship's propellor having two or more perforated hollow blades IE53509B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8105275A NL8105275A (en) 1981-11-20 1981-11-20 SHIP SCREW, PROVIDED WITH TWO OR MORE PERFORATED HOLLOW BLADES.

Publications (2)

Publication Number Publication Date
IE822759L IE822759L (en) 1983-05-20
IE53509B1 true IE53509B1 (en) 1988-11-23

Family

ID=19838424

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2759/82A IE53509B1 (en) 1981-11-20 1982-11-19 A ship's propellor having two or more perforated hollow blades

Country Status (14)

Country Link
BE (1) BE895081A (en)
DE (1) DE3242589A1 (en)
DK (1) DK508982A (en)
ES (1) ES275637Y (en)
FI (1) FI823935L (en)
FR (1) FR2516890A1 (en)
GB (1) GB2110307B (en)
GR (1) GR76737B (en)
IE (1) IE53509B1 (en)
IT (1) IT1153059B (en)
NL (1) NL8105275A (en)
NO (1) NO823840L (en)
PT (1) PT75872B (en)
SE (1) SE8206578L (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU708767C (en) * 1997-04-14 2002-08-29 Chi Keung Leung Improved fluid displacing blade
AUPO620197A0 (en) 1997-04-14 1997-05-08 Leung, Chi Keung Extra byte propeller
WO2003013954A1 (en) * 2001-08-08 2003-02-20 Robin David Shaw Cavitation alleviation and line cutting device
GB0222466D0 (en) 2002-09-27 2002-11-06 Marine Current Turbines Ltd Improvements in rotor blades and/or hydrofoils
GB0617828D0 (en) 2006-09-11 2006-10-18 Ambassador Marine Ltd Line cutter
AU2006233263B2 (en) 2006-10-02 2012-05-03 Aon Invent Llc Safety propeller
RU2539870C1 (en) * 2013-09-30 2015-01-27 Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Дальневосточный Федеральный Университет" (Двфу) Propeller screw
CN105221321A (en) * 2014-06-25 2016-01-06 上海电气风电设备有限公司 The open blade structure of ocean current power generation unit inner chamber

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE17146C (en) * FR. WREDE in Duisburg, Crefelderstr. 20 Ship propellers with hollow wings, the cavity of which communicates with the surrounding water
GB191206468A (en) * 1912-03-15 1912-05-23 Wynford Brierley Improvements in Propellers and Fans.
US1604994A (en) * 1925-08-31 1926-11-02 Patrick P Grosso Propeller
US1666517A (en) * 1927-01-25 1928-04-17 Tully Edward Ernest Propelling device for ships
GB291281A (en) * 1927-10-29 1928-05-31 William Lovis Improvements in or relating to ships' propellers
GB400913A (en) * 1932-01-29 1933-11-02 Louis Jauch Improvements in hydraulic or aerial propellers or receivers
GB396716A (en) * 1932-02-08 1933-08-08 Edward Ernest Tully Improvements in or relating to ships' propellers
US2511156A (en) * 1946-08-07 1950-06-13 Richard J Glass Propeller
GB1200162A (en) * 1966-05-24 1970-07-29 Robert Filmer Bridgland Improvements in blades for screw-propellers and lifting rotors
NL7803906A (en) * 1978-04-12 1979-10-16 Noordvos Schroeven Bv METHOD, DEVICE AND PROPELLER FOR DISTRIBUTING A GAS, POWDER OR LIQUID MATERIAL IN A LIQUID.

Also Published As

Publication number Publication date
SE8206578D0 (en) 1982-11-18
NL8105275A (en) 1983-06-16
GB2110307B (en) 1985-01-30
GB2110307A (en) 1983-06-15
BE895081A (en) 1983-05-24
GR76737B (en) 1984-08-30
IE822759L (en) 1983-05-20
SE8206578L (en) 1983-05-21
PT75872A (en) 1982-12-01
FI823935L (en) 1983-05-21
FR2516890A1 (en) 1983-05-27
FI823935A0 (en) 1982-11-17
IT8224301A1 (en) 1984-05-17
ES275637U (en) 1984-03-01
IT1153059B (en) 1987-01-14
ES275637Y (en) 1984-10-01
NO823840L (en) 1983-05-24
PT75872B (en) 1985-01-09
DK508982A (en) 1983-05-21
IT8224301A0 (en) 1982-11-17
DE3242589A1 (en) 1983-05-26

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