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US1454967A - Screw propeller and similar appliance - Google Patents

Screw propeller and similar appliance Download PDF

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Publication number
US1454967A
US1454967A US389195A US38919520A US1454967A US 1454967 A US1454967 A US 1454967A US 389195 A US389195 A US 389195A US 38919520 A US38919520 A US 38919520A US 1454967 A US1454967 A US 1454967A
Authority
US
United States
Prior art keywords
shroud
propeller
blades
flow
screw 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.)
Expired - Lifetime
Application number
US389195A
Other languages
English (en)
Inventor
Gill James Herbert Wainwright
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.)
GILL PROPELLER Co Ltd
Original Assignee
GILL PROPELLER Co Ltd
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
Priority to GB18228/19A priority Critical patent/GB142713A/en
Application filed by GILL PROPELLER Co Ltd filed Critical GILL PROPELLER Co Ltd
Priority to US389195A priority patent/US1454967A/en
Priority to FR517272A priority patent/FR517272A/fr
Priority to DE1920344976D priority patent/DE344976C/de
Priority to DK28897D priority patent/DK28897C/da
Application granted granted Critical
Publication of US1454967A publication Critical patent/US1454967A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B63H1/16—Propellers having a shrouding ring attached to blades

Definitions

  • This invention relates to screw propellers 10 and similar appliances of the axial flow type such as are employed to impart energy to fluid streams or to develop propulsive reaction.
  • the blades of the propeller are disposed within and carry 'on them a curved shroud whose inner surface has a contour'which is substantially that of a nozzle designed to give regular progressive increase in velocity or head to the fluid in which the propeller rotates.
  • the pitch of the blades increases in the direction of flow through the shroud the pitch hav ing a definite relationship to the shape of the shroud to conform to the acceleration of the fluid stream passing through the shroud.
  • the blades are carried on a suitably shaped hub which may conveniently be cylindrical though in some cases shaped otherwise and the shroud is formed integral with or is attached to the endsof the blades so that these are positioned within the shroud preferably otherwise than at the centre of the length of the latter and nearer to the larger end.
  • The, axial length of the shroud is such that is less than the diameter of the propeller and greater than the axially projected width of the blades while the contour of the inner surface of the shroud is, as mentioned, substanatially that of a nozzle of. particular design.
  • the object of the invention is to reduce interference with the natural contraction of the fluid stream under the increasing velocity impressed thereon and also to minimize discontinuity of flow and its contingent effects. These objects are attained by controlling velocities and pressures in the fluid stream during its forced acceleration,
  • the design of the nozzle-shaped'shroud should be such as to assist in the formation of vortex action resembling that of a free spiral vortex and thus tominimize dissipation of energy in the fluid which is directly acted upon by thepropeller.
  • a fluid such as water
  • the area of the stream which is acted upon by the propeller contracts under the increasing velocity and this natural contraction is assisted and controlled by the vortex shaped shrouding ring.
  • the present invention has various advantages when compared with other known types of propeller more particularly when the invention is applied to ship propulsion.
  • the improved construction reduces the erosive effect consequent on cavitation.
  • nozzle shrouding ring strengthens the propeller and permits of higher speeds of revolution While minimizing vibration. Eddy losses and radial flow are reduced as also is the out ofpitch? effect which occurs with ordinary propellers when mounted on inclined shafts. Further the effect of threshing which occurs when a vessel pitches is lessened and the shrouding ring also obviates fouling of the propeller by ropes or nets.
  • blades A is mounted a nozzle-shaped shroud C which is either formed integral with the blades or separate and attached thereto in some suitable manner.
  • the blades A preferably have a gaining pitch so as 'to conform with the acceleration of the water passing through the shroud C.
  • the length of the shroud C may vary in v accordance with requirements and the conditions under which the propeller is to be used. In the construction shown the length of the nozzle measured in the axial direction is about three-quarters of the smaller diameter of thepropeller.
  • the smaller and outlet end .6 has a diameter which is about .8 of the small diameter of the propeller.
  • the blades A are not positioned at the centre of the shroud C but to one side of this centre and somewhat towards the larger end C of the shroud.
  • the hub B may be split and handed to allow for uniform contraction of the shroud-C where the latter is made in- I tegral with the blades.
  • the leading edge C atthe inlet end of the shroud may be enlarged with an outside bulb while the after edge C is fined off from the inside, butif the propeller is likely to encounter ice or other obstructions through which it is desirable to cut the edge C may be serrated.
  • the contour of the shroud C approximates to that of a portion of a free spiral vortex and this conforms to the path which is naturally followed by the water acted on by the propeller blades.
  • the pitch of the blades increases in the direction of flow through the shroud to conform-to the acceleration of-ithe Water passing through the shroud and bears a definite relationship to the shape of the shroud.
  • a screw propeller the combination of i a hub, blades radiating from the hub, and a shroud mounted on the ends of the blades, the inner surface of the shroud having ap proximately the contour of a nozzle designed to give regular vprogressive increase in velocity or head to the fluid stream on which the propeller operates, the length of the shroud in the axial direction being less than the diameter of the propeller but greater than the axially projected width of the propeller blades, the blades having axial increase of pitch in the direction of flow through the shroud to conform with the acceleration of the water passing through the shroud. 3.
  • a screw propeller In a screw propeller the combination of a hub, blades radiating from the hub, and a shroud mounted on the ends of the blades, the inner surface of the shroud having approximately the contour of a nozzle designed to give regular progressive increase in velocity or head to the fluid stream on which the propeller operates, and the blades being positioned intermediate theends of the shroud but otherwise'than at the center of its length, the blades having axial increase of pitch in the direction of flow through the shroud to conform with the acceleration of the water passing through the shroud.
  • a screw propeller the combination of a hub, blades radiating from the hub, and a shroud mounted on the ends of the blades, said shroud havinga length which measured in the axial direction is less than the diameter of the propeller but is greater than the axially projected width of the blades, thethe shroud being curved to an approximately conical form and being outwardly flared toward one end, the blades being positioned within the shroud intermediate the ends of 5 the latter but otherwise than at the center of its length and said blades having axial increase of pitch in the direction of flow through the shroud to conform with the acceleration of the water passing through the shroud.

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)
  • Mixers Of The Rotary Stirring Type (AREA)
US389195A 1919-07-22 1920-06-15 Screw propeller and similar appliance Expired - Lifetime US1454967A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB18228/19A GB142713A (en) 1919-07-22 1919-07-22 Improvements in and relating to screw propellers and similar appliances
US389195A US1454967A (en) 1919-07-22 1920-06-15 Screw propeller and similar appliance
FR517272A FR517272A (fr) 1919-07-22 1920-06-16 Perfectionnements aux propulseurs à hélice et similaires
DE1920344976D DE344976C (de) 1919-07-22 1920-06-23 Schraubenpropeller mit Mantel
DK28897D DK28897C (da) 1919-07-22 1920-06-25 Skruepropeller og lignende.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB18228/19A GB142713A (en) 1919-07-22 1919-07-22 Improvements in and relating to screw propellers and similar appliances
US389195A US1454967A (en) 1919-07-22 1920-06-15 Screw propeller and similar appliance

Publications (1)

Publication Number Publication Date
US1454967A true US1454967A (en) 1923-05-15

Family

ID=41258144

Family Applications (1)

Application Number Title Priority Date Filing Date
US389195A Expired - Lifetime US1454967A (en) 1919-07-22 1920-06-15 Screw propeller and similar appliance

Country Status (5)

Country Link
US (1) US1454967A (da)
DE (1) DE344976C (da)
DK (1) DK28897C (da)
FR (1) FR517272A (da)
GB (1) GB142713A (da)

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595504A (en) * 1943-05-28 1952-05-06 Harold T Avery Means for producing thrust
US4930986A (en) * 1984-07-10 1990-06-05 The Carborundum Company Apparatus for immersing solids into fluids and moving fluids in a linear direction
US5620153A (en) * 1995-03-20 1997-04-15 Ginsberg; Harold M. Light aircraft with inflatable parachute wing propelled by a ducted propeller
US5944496A (en) * 1996-12-03 1999-08-31 Cooper; Paul V. Molten metal pump with a flexible coupling and cement-free metal-transfer conduit connection
US5951243A (en) * 1997-07-03 1999-09-14 Cooper; Paul V. Rotor bearing system for molten metal pumps
US6027685A (en) * 1997-10-15 2000-02-22 Cooper; Paul V. Flow-directing device for molten metal pump
US6303074B1 (en) 1999-05-14 2001-10-16 Paul V. Cooper Mixed flow rotor for molten metal pumping device
US6398525B1 (en) 1998-08-11 2002-06-04 Paul V. Cooper Monolithic rotor and rigid coupling
US6689310B1 (en) 2000-05-12 2004-02-10 Paul V. Cooper Molten metal degassing device and impellers therefor
US6723276B1 (en) 2000-08-28 2004-04-20 Paul V. Cooper Scrap melter and impeller
US7402276B2 (en) 2003-07-14 2008-07-22 Cooper Paul V Pump with rotating inlet
US20080211147A1 (en) * 2002-07-12 2008-09-04 Cooper Paul V System for releasing gas into molten metal
US7470392B2 (en) 2003-07-14 2008-12-30 Cooper Paul V Molten metal pump components
US7507367B2 (en) 2002-07-12 2009-03-24 Cooper Paul V Protective coatings for molten metal devices
US7731891B2 (en) 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US8337746B2 (en) 2007-06-21 2012-12-25 Cooper Paul V Transferring molten metal from one structure to another
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
US8444911B2 (en) 2009-08-07 2013-05-21 Paul V. Cooper Shaft and post tensioning device
US8449814B2 (en) 2009-08-07 2013-05-28 Paul V. Cooper Systems and methods for melting scrap metal
US8524146B2 (en) 2009-08-07 2013-09-03 Paul V. Cooper Rotary degassers and components therefor
US8535603B2 (en) 2009-08-07 2013-09-17 Paul V. Cooper Rotary degasser and rotor therefor
US8613884B2 (en) 2007-06-21 2013-12-24 Paul V. Cooper Launder transfer insert and system
US8714914B2 (en) 2009-09-08 2014-05-06 Paul V. Cooper Molten metal pump filter
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
US9156087B2 (en) 2007-06-21 2015-10-13 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9205490B2 (en) 2007-06-21 2015-12-08 Molten Metal Equipment Innovations, Llc Transfer well system and method for making same
US9409232B2 (en) 2007-06-21 2016-08-09 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US9410744B2 (en) 2010-05-12 2016-08-09 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9643247B2 (en) 2007-06-21 2017-05-09 Molten Metal Equipment Innovations, Llc Molten metal transfer and degassing system
US9903383B2 (en) 2013-03-13 2018-02-27 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened top
US10052688B2 (en) 2013-03-15 2018-08-21 Molten Metal Equipment Innovations, Llc Transfer pump launder system
US10138892B2 (en) 2014-07-02 2018-11-27 Molten Metal Equipment Innovations, Llc Rotor and rotor shaft for molten metal
US10267314B2 (en) 2016-01-13 2019-04-23 Molten Metal Equipment Innovations, Llc Tensioned support shaft and other molten metal devices
US10428821B2 (en) 2009-08-07 2019-10-01 Molten Metal Equipment Innovations, Llc Quick submergence molten metal pump
US10947980B2 (en) 2015-02-02 2021-03-16 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened blade tips
US11149747B2 (en) 2017-11-17 2021-10-19 Molten Metal Equipment Innovations, Llc Tensioned support post and other molten metal devices
US11358217B2 (en) 2019-05-17 2022-06-14 Molten Metal Equipment Innovations, Llc Method for melting solid metal
US11555608B1 (en) 2021-11-23 2023-01-17 Leron Hollinshed Illuminated two-piece exhibit
US11873845B2 (en) 2021-05-28 2024-01-16 Molten Metal Equipment Innovations, Llc Molten metal transfer device
US12146508B2 (en) 2022-05-26 2024-11-19 Molten Metal Equipment Innovations, Llc Axial pump and riser

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1093691B (de) * 1957-08-05 1960-11-24 Eta Corp G M B H Ganz oder teilweise duesenartig ummantelte bzw. in einem Tunnel angeordnete Treib-, insbesondere Schiffsschraube, Foerderschraube od. dgl.
DE1203635B (de) * 1962-01-12 1965-10-21 Rudolf Arnold Erren Reaktionsantrieb fuer Wasserfahrzeuge
EP0219364A1 (fr) * 1985-08-13 1987-04-22 COMPANIA AUXILIAR DE NAVEGACION S.A. (AUXINAVE) Société dite: Perfectionnements apportés aux propulseurs pour bateaux et notamment aux hélices
DE102010022070A1 (de) 2010-05-18 2011-11-24 Johann Christian Hofmann Antriebseinheit

Cited By (118)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595504A (en) * 1943-05-28 1952-05-06 Harold T Avery Means for producing thrust
US4930986A (en) * 1984-07-10 1990-06-05 The Carborundum Company Apparatus for immersing solids into fluids and moving fluids in a linear direction
US5620153A (en) * 1995-03-20 1997-04-15 Ginsberg; Harold M. Light aircraft with inflatable parachute wing propelled by a ducted propeller
US5944496A (en) * 1996-12-03 1999-08-31 Cooper; Paul V. Molten metal pump with a flexible coupling and cement-free metal-transfer conduit connection
US6345964B1 (en) 1996-12-03 2002-02-12 Paul V. Cooper Molten metal pump with metal-transfer conduit molten metal pump
US5951243A (en) * 1997-07-03 1999-09-14 Cooper; Paul V. Rotor bearing system for molten metal pumps
US6027685A (en) * 1997-10-15 2000-02-22 Cooper; Paul V. Flow-directing device for molten metal pump
US6398525B1 (en) 1998-08-11 2002-06-04 Paul V. Cooper Monolithic rotor and rigid coupling
US6303074B1 (en) 1999-05-14 2001-10-16 Paul V. Cooper Mixed flow rotor for molten metal pumping device
US6689310B1 (en) 2000-05-12 2004-02-10 Paul V. Cooper Molten metal degassing device and impellers therefor
US6723276B1 (en) 2000-08-28 2004-04-20 Paul V. Cooper Scrap melter and impeller
US7507367B2 (en) 2002-07-12 2009-03-24 Cooper Paul V Protective coatings for molten metal devices
US9435343B2 (en) 2002-07-12 2016-09-06 Molten Meal Equipment Innovations, LLC Gas-transfer foot
US8529828B2 (en) 2002-07-12 2013-09-10 Paul V. Cooper Molten metal pump components
US9034244B2 (en) 2002-07-12 2015-05-19 Paul V. Cooper Gas-transfer foot
US7731891B2 (en) 2002-07-12 2010-06-08 Cooper Paul V Couplings for molten metal devices
US20080211147A1 (en) * 2002-07-12 2008-09-04 Cooper Paul V System for releasing gas into molten metal
US8440135B2 (en) 2002-07-12 2013-05-14 Paul V. Cooper System for releasing gas into molten metal
US8110141B2 (en) 2002-07-12 2012-02-07 Cooper Paul V Pump with rotating inlet
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US8409495B2 (en) 2002-07-12 2013-04-02 Paul V. Cooper Rotor with inlet perimeters
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US7402276B2 (en) 2003-07-14 2008-07-22 Cooper Paul V Pump with rotating inlet
US8075837B2 (en) 2003-07-14 2011-12-13 Cooper Paul V Pump with rotating inlet
US8501084B2 (en) 2003-07-14 2013-08-06 Paul V. Cooper Support posts for molten metal pumps
US7470392B2 (en) 2003-07-14 2008-12-30 Cooper Paul V Molten metal pump components
US8475708B2 (en) 2003-07-14 2013-07-02 Paul V. Cooper Support post clamps for molten metal pumps
US9855600B2 (en) 2007-06-21 2018-01-02 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
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US9017597B2 (en) 2007-06-21 2015-04-28 Paul V. Cooper Transferring molten metal using non-gravity assist launder
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US10072891B2 (en) 2007-06-21 2018-09-11 Molten Metal Equipment Innovations, Llc Transferring molten metal using non-gravity assist launder
US11759854B2 (en) 2007-06-21 2023-09-19 Molten Metal Equipment Innovations, Llc Molten metal transfer structure and method
US9156087B2 (en) 2007-06-21 2015-10-13 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
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US11020798B2 (en) 2007-06-21 2021-06-01 Molten Metal Equipment Innovations, Llc Method of transferring molten metal
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US11358217B2 (en) 2019-05-17 2022-06-14 Molten Metal Equipment Innovations, Llc Method for melting solid metal
US11759853B2 (en) 2019-05-17 2023-09-19 Molten Metal Equipment Innovations, Llc Melting metal on a raised surface
US11858037B2 (en) 2019-05-17 2024-01-02 Molten Metal Equipment Innovations, Llc Smart molten metal pump
US12263522B2 (en) 2019-05-17 2025-04-01 Molten Metal Equipment Innovations, Llc Smart molten metal pump
US11931803B2 (en) 2019-05-17 2024-03-19 Molten Metal Equipment Innovations, Llc Molten metal transfer system and method
US11850657B2 (en) 2019-05-17 2023-12-26 Molten Metal Equipment Innovations, Llc System for melting solid metal
US11931802B2 (en) 2019-05-17 2024-03-19 Molten Metal Equipment Innovations, Llc Molten metal controlled flow launder
US11858036B2 (en) 2019-05-17 2024-01-02 Molten Metal Equipment Innovations, Llc System and method to feed mold with molten metal
US11358216B2 (en) 2019-05-17 2022-06-14 Molten Metal Equipment Innovations, Llc System for melting solid metal
US11471938B2 (en) 2019-05-17 2022-10-18 Molten Metal Equipment Innovations, Llc Smart molten metal pump
US12228150B2 (en) 2021-05-28 2025-02-18 Molten Metal Equipment Innovations, Llc Molten metal transfer device
US11873845B2 (en) 2021-05-28 2024-01-16 Molten Metal Equipment Innovations, Llc Molten metal transfer device
US11555608B1 (en) 2021-11-23 2023-01-17 Leron Hollinshed Illuminated two-piece exhibit
US12146508B2 (en) 2022-05-26 2024-11-19 Molten Metal Equipment Innovations, Llc Axial pump and riser

Also Published As

Publication number Publication date
FR517272A (fr) 1921-05-03
DK28897C (da) 1921-12-05
GB142713A (en) 1920-05-13
DE344976C (de) 1921-12-03

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