US3328961A - Multiple stage, hydraulic jet propulsion apparatus for water craft - Google Patents

Multiple stage, hydraulic jet propulsion apparatus for water craft Download PDF

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Publication number
US3328961A
US3328961A US495640A US49564065A US3328961A US 3328961 A US3328961 A US 3328961A US 495640 A US495640 A US 495640A US 49564065 A US49564065 A US 49564065A US 3328961 A US3328961 A US 3328961A
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US
United States
Prior art keywords
housing
stage impeller
water
stage
rearwardly
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
US495640A
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English (en)
Inventor
George R Aschauer
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.)
Twin Disc Inc
Original Assignee
Twin Disc Inc
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 Twin Disc Inc filed Critical Twin Disc Inc
Priority to US495640A priority Critical patent/US3328961A/en
Priority to GB43629/66A priority patent/GB1094169A/en
Priority to BE687753D priority patent/BE687753A/xx
Priority to DE19661302418D priority patent/DE1302418C2/de
Application granted granted Critical
Publication of US3328961A publication Critical patent/US3328961A/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
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/10—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof
    • B63H11/107—Direction control of propulsive fluid
    • B63H11/11—Direction control of propulsive fluid with bucket or clamshell-type reversing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
    • B63H2011/084—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type with two or more pump stages

Definitions

  • the figure is a longitudinal cross sectional view through a jet propulsion unit embodying the present invention.
  • the maximum propulsive efficiency depends among "other things, on the unit size and weight, g.p.m. of water flow, boat stall thrust and accelerating capability and allowable specific speed. High efi'iciency requires large flow of water and low jet velocity, consequently low jet pressure. Specific speed is represented by the known formula r.p.rn. vg.pm. where r.p.m. is the speed of the impeller, g.p.m. is the water flowing through and H is pressure head in feet of water generated by the pump.
  • the present invention utilizes a large diameter, low speed impeller.
  • Ns specific speed
  • the large impeller design provides a large intake area and consequently good initial force due to atmospheric pressure to thereby push water into the intake. This permits use of a lower specific speed (Ns) value, which is desirable, because the rpm. can be less.
  • the quantity of water (mass) flowing through the unit should be as great as possible but is limited due to the physical strength and size of the water-borne craft.
  • Prior art propulsion units have of course used multiplestages but these stages have been of the same size and speed as one another.
  • the subsequent stages are also only low pressure rise stages because they all have the same flow (g.p.m.) and speed (r.p.m.).
  • Ns specific speed
  • Nsv specific speed
  • Hsv pump generated head
  • the rpm. speed of the second stage impeller is greater than the first stage and furthermore the cross sectional area of the impeller housing decreases in a direction approaching the discharge end. This results in a high speed pumping unit with a corresponding high pressure-rise through the unit.
  • the propulsion unit U with a housing H is mounted with its intake 1 flush with the bottom 2 of the water craft C, and the discharge end 3 of the housing extends through the stem 4 of the craft in accordance with conventional practice.
  • a nozzle N extends rearwardly beyond the stern for receiving the stream of water from the housing in the boat and discharging it to propel, steer or reverse the boat in the known manner.
  • the nozzle may be of the type shown in my co-pending US. application Ser. No. 207,642, filed July 5, 1962 and entitled Jet Propelled Water Craft, which issued May 17, 1966 as Patent No. 3,251,185.
  • a power plant 5 drives the drive shaft 6 and a gear reduction means 7 is also driven from the shaft 6 and it in turn drives the drive leeve 8 within the housing H.
  • a first stage impeller 10 is fixed to the sleeve 8 and driven thereby to form a low speed pump or impeller.
  • a second stage impeller 12 is fixed to and driven by the shaft 6 to form the high speed pump or impeller.
  • impellers are free or unsupported by a surrounding ring, and these ends are tapered rearwardly to define an impeller periphery which complements and is located closely adjacent to the internal shape of the housing in which they are mounted, as will appear.
  • Fixed stator blades 14 aresecured within the housing and are located behind the first stage impeller 10, and the hub 14a of these blades forms a support for the sleeve bearing 14b in which the rear end of the drive sleeve 8 is rotatably mounted.
  • Fixed stator blades 15 are fixed within the housing and directly behind the second stage impeller and the central hub 15a of these blades has a sleeve bearing 15b therein which rotatably supports the rear end of the drive shaft 6.
  • the second impeller 12 may be of smaller diameter than the first stage impeller 10 and as previously menportion 18 may be of generally constant cross sectional area in a rearward direction. It will be noted, however, that subsequent portions of the housing as it extends rearwardly from the intake side 19 of the first stage impeller may converge or decrease in cross sectional area until it is rearward of the last impeller. The housing then converges up to the discharge end 3 of the unit.
  • the housing closely surrounds and complements the peripheral shape of the impellers.
  • the eye of the pump or unit U is the shaft 6, and when the craft is at the dock the net inlet head Ilsv at pump inlet is less than atmospheric because this pump eye is above the water level and also because of inlet friction flow losses due to bends, intake grill and other obstructions and disturbances.
  • a multiple-stage hydraulic jet propulsion unit is provided which is particularly efficient at operating speed.
  • the unit will operate with only minor cavitation.
  • a multi-stage, hydraulic jet propulsion unit for waterborne craft comprising, a housing having a forward intake portion for receiving water and a rearward discharge portion for discharging water rearwardly of the stern of the craft, and said housing having a rearwardly converging portion, a first stage impeller mounted within said converging portion for being rotationally driven, a second stage impeller mounted within said converging portion and located rearwardly of and of smaller diameter than said first stage impeller and in co-axial alignment therewith, said housing closely surrounding said impellers in complementary converging relationship therewith, the flow rate of the water through the first stage impeller being the same as that through said second stage impeller and means for rotationally driving said second stage impeller faster than said first stage impeller.
  • a unit as defined in claim 1 including stator blades fixed within said converging portion of said housing and located between said impellers and also rearwardly of said second stage impeller for straightening out the flow of water.
  • a multi-stage, hydraulic jet propulsion unit for water-borne craft comprising, a housing having an inlet flush with the bottom of said craft for receiving water and a rearwardly and also an upwardly inclined forward portion extending from said inlet, said housing having an intermediate portion which converges rearwardly, and a rear discharge portion for discharging water rearwardly of the stern of the craft, a first stage impeller and a second stage impeller both mounted within said converging portion for being rotationally driven, said second stage impeller located rearwardly of and of smaller diameter than said first stage impeller and in co-aXial alignment therewith, said housing closely surrounding said impellers in complementary converging relationship therewith, the flow rate of the water through the first stage impeller being the same as that through said second stage impeller and means for rotationally driving said second stage impeller faster than said first stage impeller.
  • a unit as defined in claim 3 including stator blades fixed within said converging housing portion and located rearwardly of each of said impellers.
  • a multi-stage, hydraulic jet propulsion unit for water-borne craft comprising, a housing having an inlet flush with the bottom of said craft for receiving water and a forward portion extending rearwardly and upwardly from said inlet, said housing also having a rearwardly converging portion, and a rear discharge portion, a nozzle connected to said discharge portion whereby said housing discharges water into said nozzle, a first stage impeller and a second stage impeller both mounted within said converging portion for being rotationally driven, said second stage impeller located rearwardly of and of smaller diameter than said first stage impeller and in co-axial alignment therewith, stator blades fixed within said converging housing portion and located rearwardly of each of said impellers, said housing closely surrounding said impellers in complementary converging relationship therewith, the flow rate of the water through the first stage impeller being the same as that through said second stage impeller and means including an engine and gear reduction unit for rotationally driving said second stage impeller faster than said first stage impeller.
  • a multi-stage, hydraulic jet propulsion unit for water-borne craft comprising, a housing having a forward intake portion for receiving water and a rearward discharge portion for discharging water rearwardly of the stern of the craft, a first stage impeller mounted within said housing for being rotationally driven, a second stage impeller mounted within said housing and located rearwardly of said first stage impeller and in co-axial therewith, said housing closely surrounding said impellers in complementary relationship therewith, the flow rate of the water through the first stage impeller being the same as that through said second stage impeller and means for rotationally driving said second stage impeller faster than said first stage impeller.
  • a unit as defined in claim 6 including stator blades fixed within said housing and located between said impellers and other stator blades located rearwardly of said second stage impeller for straightening out the flow of water.
  • a unit as defined in claim 6 further characterized in that said housing has an inlet in the bottom of said craft and also a rearwardly and upwardly inclined forward portion extending from said inlet.
  • a unit as defined in claim 8 including stator blades fixed within said housing and located rearwardly of each of said impellers.
  • the propulsion unit as defined in claim 9 including a nozzle connected to said discharge portion whereby said housing discharges water into said nozzle, and said means for driving said impellers includes an engine and gear reduction unit.

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)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
US495640A 1965-10-13 1965-10-13 Multiple stage, hydraulic jet propulsion apparatus for water craft Expired - Lifetime US3328961A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US495640A US3328961A (en) 1965-10-13 1965-10-13 Multiple stage, hydraulic jet propulsion apparatus for water craft
GB43629/66A GB1094169A (en) 1965-10-13 1966-09-29 Multiple stage, hydraulic jet propulsion apparatus for water craft
BE687753D BE687753A (enrdf_load_stackoverflow) 1965-10-13 1966-10-03
DE19661302418D DE1302418C2 (de) 1965-10-13 1966-10-12 Zweistufiger hydraulischer strahlantrieb fuer wasserfahrzeuge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US495640A US3328961A (en) 1965-10-13 1965-10-13 Multiple stage, hydraulic jet propulsion apparatus for water craft

Publications (1)

Publication Number Publication Date
US3328961A true US3328961A (en) 1967-07-04

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Family Applications (1)

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US495640A Expired - Lifetime US3328961A (en) 1965-10-13 1965-10-13 Multiple stage, hydraulic jet propulsion apparatus for water craft

Country Status (4)

Country Link
US (1) US3328961A (enrdf_load_stackoverflow)
BE (1) BE687753A (enrdf_load_stackoverflow)
DE (1) DE1302418C2 (enrdf_load_stackoverflow)
GB (1) GB1094169A (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977353A (en) * 1974-07-31 1976-08-31 James Toyama Jet powered marine propulsion unit
US4120152A (en) * 1977-03-15 1978-10-17 Rockwell International Corporation Anti-vortex pintle
US4182118A (en) * 1971-04-18 1980-01-08 Chronic Bill M Jet propulsion engine
US4252500A (en) * 1979-10-26 1981-02-24 Berry Clyde F Turbine with rotors geared together
US5277631A (en) * 1991-10-14 1994-01-11 Sanshin Kogyo Kabushiki Kaisha Vane arrangement for a water jet propulsion assembly
US6027383A (en) * 1990-05-10 2000-02-22 Broinowski; Stefan Marine ducted propeller jet propulsion unit
US20030049978A1 (en) * 2001-08-20 2003-03-13 Patrice Dusablon Watercraft having a jet propulsion system that generates improved thrust
US6981902B1 (en) * 2003-11-03 2006-01-03 Samuel Barran Tafoya Marine reaction thruster
US20060204384A1 (en) * 2004-09-03 2006-09-14 Cornell Donald E Water cannon
US20080138199A1 (en) * 2006-12-12 2008-06-12 Bor-Haw Chang Fan device capable of increasing air pressure and air supply
US20090061704A1 (en) * 2007-08-27 2009-03-05 Yuting Rui Weed Cutter for a Craft Propelled by a Water Jet

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000125A1 (en) * 1981-06-25 1983-01-20 George Branko Skrinjar Hydrojet
WO1984001760A1 (en) * 1982-10-27 1984-05-10 Skrinjar Designers Constructor Hydro turbo jet
WO1984001758A1 (en) * 1982-10-27 1984-05-10 Skrinjar Designers Constructor Turbo jet pump
DE3942673A1 (de) * 1989-12-22 1991-07-04 Merz Josef Wasserstrahlantrieb fuer wasserfahrzeuge
US5236379A (en) * 1991-11-04 1993-08-17 Norman D. Harris Personal watercraft gullet
GB2331555A (en) * 1997-11-20 1999-05-26 Jozef Feliks Dembski Force producing apparatus
CN112776968B (zh) * 2021-02-10 2022-08-30 北京理工大学 一种转速可调的双涵道喷水推进泵
CN112776967B (zh) * 2021-02-10 2022-08-30 北京理工大学 一种轴流式双涵道喷水推进器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1316139A (en) * 1919-09-16 Air compressor
US2981464A (en) * 1958-07-22 1961-04-25 Gen Electric Multiple propeller fan
US3083529A (en) * 1959-03-24 1963-04-02 Charles W F Hemilton Hydraulic jet propulsion apparatus for water-borne craft
US3143857A (en) * 1960-05-02 1964-08-11 Star Fire Marine Jet Company Combined forward and reverse steering device for jet propelled aquatic vehicles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1316139A (en) * 1919-09-16 Air compressor
US2981464A (en) * 1958-07-22 1961-04-25 Gen Electric Multiple propeller fan
US3083529A (en) * 1959-03-24 1963-04-02 Charles W F Hemilton Hydraulic jet propulsion apparatus for water-borne craft
US3143857A (en) * 1960-05-02 1964-08-11 Star Fire Marine Jet Company Combined forward and reverse steering device for jet propelled aquatic vehicles

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182118A (en) * 1971-04-18 1980-01-08 Chronic Bill M Jet propulsion engine
US3977353A (en) * 1974-07-31 1976-08-31 James Toyama Jet powered marine propulsion unit
US4120152A (en) * 1977-03-15 1978-10-17 Rockwell International Corporation Anti-vortex pintle
US4252500A (en) * 1979-10-26 1981-02-24 Berry Clyde F Turbine with rotors geared together
US6027383A (en) * 1990-05-10 2000-02-22 Broinowski; Stefan Marine ducted propeller jet propulsion unit
US5277631A (en) * 1991-10-14 1994-01-11 Sanshin Kogyo Kabushiki Kaisha Vane arrangement for a water jet propulsion assembly
US20030049978A1 (en) * 2001-08-20 2003-03-13 Patrice Dusablon Watercraft having a jet propulsion system that generates improved thrust
US6981902B1 (en) * 2003-11-03 2006-01-03 Samuel Barran Tafoya Marine reaction thruster
US20060204384A1 (en) * 2004-09-03 2006-09-14 Cornell Donald E Water cannon
US20080138199A1 (en) * 2006-12-12 2008-06-12 Bor-Haw Chang Fan device capable of increasing air pressure and air supply
US20090061704A1 (en) * 2007-08-27 2009-03-05 Yuting Rui Weed Cutter for a Craft Propelled by a Water Jet
US7950974B2 (en) * 2007-08-27 2011-05-31 Surfango, Inc. Weed cutter for a craft propelled by a water jet

Also Published As

Publication number Publication date
GB1094169A (en) 1967-12-06
DE1302418B (enrdf_load_stackoverflow) 1972-08-31
DE1302418C2 (de) 1973-05-17
BE687753A (enrdf_load_stackoverflow) 1967-03-16

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