CA2509047A1 - Variable marine jet propulsion - Google Patents

Variable marine jet propulsion Download PDF

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Publication number
CA2509047A1
CA2509047A1 CA002509047A CA2509047A CA2509047A1 CA 2509047 A1 CA2509047 A1 CA 2509047A1 CA 002509047 A CA002509047 A CA 002509047A CA 2509047 A CA2509047 A CA 2509047A CA 2509047 A1 CA2509047 A1 CA 2509047A1
Authority
CA
Canada
Prior art keywords
water
pump
variable
propulsion system
jet propulsion
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
CA002509047A
Other languages
French (fr)
Other versions
CA2509047C (en
Inventor
Jeff Jordan
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2509047A1 publication Critical patent/CA2509047A1/en
Application granted granted Critical
Publication of CA2509047C publication Critical patent/CA2509047C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/02—Initiating means for steering, for slowing down, otherwise than by use of propulsive elements, or for dynamic anchoring
    • 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
    • B63H11/10—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof
    • B63H11/103—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof having means to increase efficiency of propulsive fluid, e.g. discharge pipe provided with means to improve the fluid flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/02—Initiating means for steering, for slowing down, otherwise than by use of propulsive elements, or for dynamic anchoring
    • B63H25/04—Initiating means for steering, for slowing down, otherwise than by use of propulsive elements, or for dynamic anchoring automatic, e.g. reacting to compass
    • 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
    • B63H2011/043—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps with means for adjusting or varying pump inlets, e.g. means for varying inlet cross section area
    • 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
    • B63H2011/046—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps comprising means for varying pump characteristics, e.g. rotary pumps with variable pitch impellers, or adjustable stators
    • 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
    • B63H2011/081—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type with axial flow, i.e. the axis of rotation being parallel to the flow direction

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Turbines (AREA)
  • Control Of Turbines (AREA)

Abstract

A variable marine jet propulsion system incorporates a motor (21), variable pitch propeller pump (50) in a spherical housing (62), a variable housing and a variable inlet duct, and a microcontroller (140). The pump, nozzle, and inlet are controlled by the microcontroller, which is programmed to control the pump as a continuously variable power transmission for maintaining efficient motor operation, the nozzle for maintaining efficient pump operation, and the inlet for maintaining efficient recovery of the total dynamic head of the incoming water. The spherical pump housing maintains close fits to the propeller vane tips for more efficient operation at all pitches, including zero and reverse pitches. Zero pitch results in no effective pumping action, effectively a true neutral in fluid power transmission. Reverse pitch in combination with the large variable nozzle provide reverse flow and consequently reverse thrust, which eliminates the need for a backing bucket.

Claims (23)

1. An improved water jet propulsion system for a jet propelled watercraft, comprising a) a motor; and b) a variable-pitch propeller pump capable of acting as a continuously variable power transmission for said motor;
said pump includes a multiplicity of vanes and an adjustment means capable of adjusting the pitch on said vanes so that the water flow and consequently the pump power demand vary with the pitch of said vanes.
2. An improved water jet propulsion system as recited in claim 1, wherein said pump incorporates a spherical housing to maintain close contact with the tips of said vanes over a wide range of vane pitch.
3. An improved water jet propulsion system as recited in claim 2, wherein said pump also incorporates a spherical hub, which is concentric to the spherical housing, so that the area through which the water flows is constant due to the uniform space between said spherical hub and said spherical housing.
4. An improved water jet propulsion system as recited in claims 1, 2, or 3, wherein said pump is controlled to follow the efficient power curve of said motor.
5. An improved water jet propulsion system as recited in claims 1, 2, or 3, wherein said pump is controlled by input from a human operator.
6. An improved water jet propulsion system as recited in claim 1, 2, or 3, wherein said pump is controlled by input from the control means of said motor.
7. An improved water jet propulsion system as recited in claim 1, 2, 3, 4, 5, or 6, wherein said pump is used in combination with a variable nozzle, which is controlled to maintain the efficiency of said pump.
8. An improved water jet propulsion system as recited in claim 7, wherein said nozzle is controlled to maintain the head affinity relationship of said pump.
9. An improved water jet propulsion system as recited in claim 7, wherein said nozzle is controlled to maintain the efficiency of said pump based on test data on said pump.
10. An improved water jet propulsion system as recited in claim 1, 2, 3, 5, 7, or 9, wherein said variable pitch of said pump is controlled by operator input to provide variable forward, neutral and reverse propulsion for maneuvering.
11. An improved water jet propulsion system as recited in claim 1, 2, 3, 5, 7, 9, or 10, wherein the leading and trailing edges of said pump vanes are made with close tolerances as they pass through zero pitch to provide a cutting action between them for removing debris.
12. An improved water jet propulsion system as recited in claims 1 through 10, which incorporates an adjustable water inlet capable of efficiently delivering water to said pump, said inlet duct includes a hydraulically efficient inlet tunnel having an entrance opening and an exit opening, said entrance opening having an adjustment means capable of adjusting the size of said entrance opening so that the velocity of water through said entrance opening matches the velocity of the watercraft in the body of water in which it moves.
13. An improved water jet propulsion system as recited in claim 12, wherein said adjustment means is a slide that moves from aft forward to reduce said entrance opening and to elongate the enclosed portion of said hydraulically efficient tunnel.
14. An improved water jet propulsion system as recited in claims 12 and 13, wherein said adjustment means is controlled as a nozzle, when said pump is operating in reverse pitch, to increase the reverse thrust of said system.
15. A method for maintaining the motor efficiency of a marine j et propulsion system for a watercraft including an inlet duct, an adjustable-pitch pump, and an adjustable discharge nozzle, the watercraft passing at a velocity through a body of water, the motor having a shaft speed in a range of shaft speeds, said method including the following steps:
a) selecting an adjustable pitch pump capable of varying the shaft power demand on said motor when operating at all shaft speeds in the range of shaft speeds;
b) operating the motor to adjust the velocity of said watercraft through the body of water; and, c) adjusting the adjustable pitch pump so that the shaft power demand on the motor is close to ideal for the current shaft speed of the motor.
16. A method for maintaining the efficiency of a marine jet propulsion system for a watercraft including an inlet duct, an adjustable-pitch pump, and an adjustable discharge nozzle, the watercraft passing at a velocity through a body of water, the motor having a shaft speed in a range of shaft speeds, said method including the following steps:
a) selecting an adjustable pitch pump capable of varying the shaft power demand on said motor when operating at all shaft speeds in the range of shaft speeds;
b) selecting an adjustable nozzle capable of varying the head on and flow through the adjustable pitch pump;
c) operating the motor to adjust the velocity of said watercraft through the body of water;
d) adjusting the adjustable pitch pump so that the shaft power demand on the motor is close to ideal for its current shaft speed; and e) adjusting the variable nozzle to maintain the most efficient head and flow on the adjustable pitch pump.
17. A method for maintaining the efficiency of a marine jet propulsion system for a watercraft including an adjustable inlet duct, an adjustable-pitch pump, and an adjustable discharge nozzle, the watercraft passing at a velocity through a body of water, the motor having a shaft speed in a range of shaft speeds, said method including the following steps:
a) selecting an adjustable pitch pump capable of varying the shaft power demand on said motor when operating at all shaft speeds in the range of shaft speeds;
b) selecting an adjustable nozzle capable of varying the head on and flow through the adjustable pitch pump;
c) selecting an adjustable inlet duct;
d) operating the motor to adjust the velocity of said watercraft through the body of water;
e) adjusting the adjustable pitch pump so that the shaft power demand on the motor is close to ideal for its current shaft speed;
f) adjusting the variable nozzle to maintain the most efficient head and flow on the adjustable pitch pump; and g) adjusting the variable inlet to maintain efficient recovery of the total dynamic head of the water entering the marine jet propulsion system.
18. A method for providing continuously variable forward, neutral and reverse power transmission in a marine jet propulsion system for a watercraft which includes a pumping means and a discharge nozzle, said pumping means capable of receiving incoming water and forcibly expelling the water to propel the watercraft through a body of water, said method including the following steps:
a) selecting an adjustable pitch pump capable of operating in forward, neutral, and reverse pitches, when operating at all shaft speeds in the range of shaft speeds;
b) selecting a large steering nozzle capable of redirecting the flow of water to create a steering force by the consequent change in angular momentum of the water when the water is flowing in either the forward or reverse direction through the nozzle;
c) operating the motor to adjust the velocity of said watercraft through the body of water;
d) adjusting the adjustable pitch pump so that the direction of water flow through the marine jet propulsion system is proportionate to the operator's input demand for forward, neutral or reverse thrust; and e) adjusting the large steering nozzle to provide steering response to the operator's input in both forward and reverse.
19. A method for providing continuously variable forward, neutral and reverse power transmission in a marine jet propulsion system for a watercraft which includes an inlet duct, a pumping means and a discharge nozzle, said pumping means capable of receiving incoming water from either the inlet duct or the nozzle and forcibly expelling the water to propel the watercraft through a body of water, said method including the following steps:
a) selecting an adjustable pitch pump capable of operating in forward, neutral, and reverse pitches, when operating at all shaft speeds in the range of shaft speeds;
b) selecting a large steering nozzle capable of redirecting the flow of water to create a steering force by the consequent change in angular momentum of the water when the water is flowing in either the forward or reverse direction through the nozzle;

c) selecting variable inlet duct capable of varying the entrance area of the inlet duct;
d) operating the motor to adjust the velocity of said watercraft through the body of water;
e) adjusting the adjustable pitch pump so that the direction of water flow through the marine jet propulsion system is proportionate to the operator's input demand for forward, neutral or reverse thrust;
f) adjusting the inlet duct to allow full flow into the system, when the pump is operating in forward pitch or neutral pitch;
g) adjusting the inlet duct to reduce the inlet duct entrance area, when the pump is operating in reverse pitch, to provide a more efficient nozzle area for the reverse water flow, and consequently more efficient reverse propulsion;
and h) adjusting the large steering nozzle to provide steering response to the operator's input in both forward and reverse.
20. A watercraft, comprising a hull suitable for passage relative to a body of water, a motor engine located in the hull, and a water jet propulsion system connected to the motor engine, the water jet propulsion system including:
a) a variable pumping means, b) an inlet duct to receive water from the body of water and direct the received water to the variable pumping means, and c) a discharge nozzle to receive water exiting from the pumping means and discharge the received water from the watercraft.
21. A watercraft, as recited in claim 20, wherein the water jet propulsion system includes:
a) a variable pumping means;
b) an inlet duct to receive water from the body of water and direct the received water to the variable pumping means; and c) a variable discharge nozzle to receive water exiting from the pumping means and discharge the received water from the watercraft.
22. A watercraft, as recited in claim 21, wherein the water jet propulsion system includes:
a) a variable pumping means;
b) a variable inlet duct to receive water from the body of water and direct the received water to the variable pumping means; and c) a variable discharge nozzle to receive water exiting from the pumping means and discharge the received water from the watercraft.
23. A watercraft, as recited in claim 22, wherein:
a) the variable pumping means is controlled to maintain efficient operation of the motor;
b) the variable inlet duct is controlled to efficiently recover the total dynamic head of the water entering the water jet propulsion system from the body of water and direct the received water to the variable pumping means; and c) the variable discharge nozzle is controlled to maintain efficient operation of the variable pumping means.
CA2509047A 2002-12-10 2003-12-10 Variable marine jet propulsion Expired - Fee Related CA2509047C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US43228102P 2002-12-10 2002-12-10
US60/432,281 2002-12-10
PCT/US2003/039296 WO2004052721A2 (en) 2002-12-10 2003-12-10 Variable marine jet propulsion

Publications (2)

Publication Number Publication Date
CA2509047A1 true CA2509047A1 (en) 2004-06-24
CA2509047C CA2509047C (en) 2011-02-01

Family

ID=32507882

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2509047A Expired - Fee Related CA2509047C (en) 2002-12-10 2003-12-10 Variable marine jet propulsion

Country Status (5)

Country Link
EP (1) EP1587732A4 (en)
AU (1) AU2003297835B2 (en)
CA (1) CA2509047C (en)
NZ (1) NZ541125A (en)
WO (1) WO2004052721A2 (en)

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US8651400B2 (en) 2007-01-12 2014-02-18 Rain Bird Corporation Variable arc nozzle
US8074897B2 (en) 2008-10-09 2011-12-13 Rain Bird Corporation Sprinkler with variable arc and flow rate
US8272583B2 (en) 2009-05-29 2012-09-25 Rain Bird Corporation Sprinkler with variable arc and flow rate and method
US8925837B2 (en) 2009-05-29 2015-01-06 Rain Bird Corporation Sprinkler with variable arc and flow rate and method
US8695900B2 (en) 2009-05-29 2014-04-15 Rain Bird Corporation Sprinkler with variable arc and flow rate and method
US9504209B2 (en) 2010-04-09 2016-11-29 Rain Bird Corporation Irrigation sprinkler nozzle
US9427751B2 (en) 2010-04-09 2016-08-30 Rain Bird Corporation Irrigation sprinkler nozzle having deflector with micro-ramps
US9079202B2 (en) 2012-06-13 2015-07-14 Rain Bird Corporation Rotary variable arc nozzle
US9174227B2 (en) 2012-06-14 2015-11-03 Rain Bird Corporation Irrigation sprinkler nozzle
US9295998B2 (en) 2012-07-27 2016-03-29 Rain Bird Corporation Rotary nozzle
US9327297B2 (en) 2012-07-27 2016-05-03 Rain Bird Corporation Rotary nozzle
US9314952B2 (en) 2013-03-14 2016-04-19 Rain Bird Corporation Irrigation spray nozzle and mold assembly and method of forming nozzle
US20150098842A1 (en) * 2013-10-04 2015-04-09 Harry Menian Impulse Plus Propulsion System
US10322423B2 (en) 2016-11-22 2019-06-18 Rain Bird Corporation Rotary nozzle
US11154877B2 (en) 2017-03-29 2021-10-26 Rain Bird Corporation Rotary strip nozzles
US11059056B2 (en) 2019-02-28 2021-07-13 Rain Bird Corporation Rotary strip nozzles and deflectors
RU192144U1 (en) * 2019-05-07 2019-09-04 Федеральное государственное бюджетное образовательное учреждение высшего образования "Рыбинский государственный авиационный технический университет имени П.А. Соловьева" JET WATER ENGINE
US11406999B2 (en) 2019-05-10 2022-08-09 Rain Bird Corporation Irrigation nozzle with one or more grit vents
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Also Published As

Publication number Publication date
AU2003297835A1 (en) 2004-06-30
WO2004052721A3 (en) 2004-09-02
NZ541125A (en) 2007-05-31
WO2004052721A2 (en) 2004-06-24
EP1587732A2 (en) 2005-10-26
CA2509047C (en) 2011-02-01
EP1587732A4 (en) 2011-04-13
AU2003297835B2 (en) 2010-12-23

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Effective date: 20161212