EP3581246A1 - Wasserstrahlantriebsvorrichtung - Google Patents

Wasserstrahlantriebsvorrichtung Download PDF

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Publication number
EP3581246A1
EP3581246A1 EP19179798.4A EP19179798A EP3581246A1 EP 3581246 A1 EP3581246 A1 EP 3581246A1 EP 19179798 A EP19179798 A EP 19179798A EP 3581246 A1 EP3581246 A1 EP 3581246A1
Authority
EP
European Patent Office
Prior art keywords
propulsion
motor
path
flow
passages
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.)
Withdrawn
Application number
EP19179798.4A
Other languages
English (en)
French (fr)
Inventor
Archie David Richard O'Brien
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.)
Obrien Archie David Richard
Original Assignee
Obrien Archie David Richard
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 Obrien Archie David Richard filed Critical Obrien Archie David Richard
Publication of EP3581246A1 publication Critical patent/EP3581246A1/de
Withdrawn legal-status Critical Current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
    • B63H11/04—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
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B35/00—Swimming framework with driving mechanisms operated by the swimmer or by a motor
    • A63B35/08—Swimming framework with driving mechanisms operated by the swimmer or by a motor with propeller propulsion
    • A63B35/12—Swimming framework with driving mechanisms operated by the swimmer or by a motor with propeller propulsion operated by a motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/46—Divers' sleds or like craft, i.e. craft on which man in diving-suit rides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B32/00—Water sports boards; Accessories therefor
    • B63B32/10—Motor-propelled water sports boards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B34/00—Vessels specially adapted for water sports or leisure; Body-supporting devices specially adapted for water sports or leisure
    • B63B34/10—Power-driven personal watercraft, e.g. water scooters; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/01—Marine propulsion by water jets having means to prevent foreign material from clogging fluid passage way
    • 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
    • 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

Definitions

  • the present invention relates to a waterjet propulsion apparatus.
  • the apparatus is particularly suitable for use in a personal marine propulsion device (sometimes known as dive propulsion vehicles) that can be held by an individual or otherwise attached to an individual to aid their propulsion through and under water.
  • a personal marine propulsion device sometimes known as dive propulsion vehicles
  • Such devices are generally used for leisure purposes but also have applications in any other situation in which it might be desirable to propel an individual through water without the use of a larger vehicle.
  • Various personal marine propulsion devices are currently known.
  • such devices consist of a propeller driven by a motor and a power supply contained within a watertight housing.
  • the propeller is generally external to the housing but contained within a casing that allows water to be drawn through the propeller but protects the user from coming into contact with the propeller.
  • the devices generally have handles formed on an outer surface of the housing to allow a user to hold onto the device during use. When in use, a user will hold the device out in front of them or between their legs in order to propel themselves through the water.
  • Waterjet propulsion is the method of propulsion utilised in jetskis.
  • waterjet propulsion water is drawn through a flow-path formed through a device by means of an impeller located within the flow-path.
  • the flow-path consists of a passage having a single intake and a single outlet and the impeller is located centrally within the passage. Steering is achieved by changing the direction in which water leaving the outlet is directed using one or movable steering flaps or other equivalent means located in or at the outlet.
  • the intake is generally positioned ahead of the impeller and is, for example, positioned on the lower side of a jetski.
  • the motor In a typical waterjet propulsion system the motor is positioned directly in front of the impeller outside of the flow-path and drives the impeller by means of a drive shaft that extends into the flow-path.
  • the flow-path will typically deviate beneath or to the side the motor and the intake will be positioned beneath or to the side of the motor.
  • Personal marine propulsion devices having waterjet propulsion are desirable as the propulsion is generally more powerful and safer than propeller propulsion.
  • the length of flow-path required to achieve efficient waterjet propulsion has been considered to make waterjet propulsion generally unsuitable for personal marine propulsion devices.
  • currently available devices are excessively large and/or heavy.
  • the present invention provides a waterjet propulsion apparatus for a propulsion device comprising a motor, an impeller driven by the motor via a drive shaft, and a power source; wherein:
  • the present invention is advantageous in that it provides a waterjet propulsion apparatus that has a construction that allows it to be made to be very lightweight and compact.
  • the waterjet apparatus is suitable for use in a personal marine propulsion device and would allow such a device to be constructed to be lightweight and compact enough for it to be used by an individual without difficulty.
  • the positioning of the motor at the rear of the apparatus the two propulsion passages results in a compact construction that can be significantly shorter in length than waterjet propulsion devices according to the prior art.
  • the flow-path having two propulsion passages after the impeller, rather than a single passage allows the flow-path after the impeller to be provided in a more compact manner as compared to the prior art without reducing the outlet area, whilst still providing stable and directed propulsion.
  • the structure of the apparatus of the present invention also ensures that the fluid inlets can be substantially unobstructed by any other part of the apparatus.
  • the apparatus of the present invention comprises a suitable power source for driving the motor.
  • the power source may be a compact battery, such as used in similar existing apparatus.
  • each propulsion passage may progressively reduce in cross-section from its propulsion inlet to its outlet. Forming the propulsion passages in this manner is advantageous in that results in a controlled decrease in pressure along each passage, and an increased velocity of the water exiting the propulsion passages, which can provide improved thrust at the outlets of the propulsion passage.
  • outlets may be substantially cylindrical, rectangular or any other suitable shape.
  • the apparatus of the present invention is used in a personal marine propulsion device there is no requirement for the apparatus or device to comprise means to change the direction of the water leaving the outlets of the propulsion passages. If no such means are present then a device comprising the apparatus of the present invention can be steered by the user directing the device appropriately.
  • embodiments of the invention may comprise steering means located at or adjacent the outlets of the propulsion passages in order to vary the direction of the water exiting the outlets and thereby steer a device comprising the apparatus. Any such steering means can be formed in any manner apparent to the person skilled in the art, for example in the manner in which steering means of conventional jetskis are formed.
  • propulsion passages may be formed in any manner apparent to the person skilled in the art.
  • both propulsion passages may be defined by a unitary splitter component that is mounted within the housing.
  • the unitary splitter may be a moulded component.
  • the motor may be directly mounted to the splitter and the drive shaft will extend through the splitter into the flow-path.
  • the apparatus may further comprise a heat-sink such as a heat conductive casing or heat exchanger that is in direct or indirect thermal connection with the motor and is arranged such that an outer surface of the heat sink is in direct contact with water when the apparatus is in use and submerged.
  • a heat-sink such as a heat conductive casing or heat exchanger that is in direct or indirect thermal connection with the motor and is arranged such that an outer surface of the heat sink is in direct contact with water when the apparatus is in use and submerged.
  • any such heat sink is not completely enclosed within any housing of the apparatus but includes a heat exchanger surface that is directly in contact with water when the apparatus is in use and submerged.
  • any such heat exchanger surface is advantageously arranged such that a user will not easily come into contact with the heat exchanger surface when a device comprising the apparatus is in use.
  • each propulsion passage may have one or more, preferably at least four, equally circumferentially spaced radially extending fins.
  • the apparatus may further comprise a housing substantially containing the components of the apparatus and wherein the at least one fluid inlet is formed at a front end of the housing and the outlets of the propulsion passages are formed at a rear end of the housing.
  • a housing of an apparatus of the present invention may be formed in any suitable manner. If the apparatus forms part of a personal marine propulsion device the housing may be formed such that it can be used by an individual in a simple manner.
  • the housing may have one or more handles located on an outer surface to allow a user to hold on to the device when in use.
  • the housing may be formed as a back-pack and comprise one or more straps to allow a user to wear the device as a back-pack.
  • the components of the invention may be mounted to a housing in any suitable manner.
  • one or more of the components may be mounted to the housing by vibration mounts to reduce noise of the apparatus during operation and to reduce wear and tear of the components during operation of the apparatus.
  • the propulsion passages may be mounted to a housing by means of vibration mounts, this may be particularly advantageous if the propulsion passages are defined within a splitter formed as a unitary component.
  • the impeller of the present invention may be formed in any suitable manner.
  • the impeller may be formed by 3D printing using solid laser sintering.
  • the drive shaft of the apparatus of the present invention may be mounted within the apparatus in any manner apparent to the skilled person.
  • the drive shaft will be mounted within one or more bearings.
  • Such bearings may be of any suitable type including, but not limited to, waterproof bearings or ceramic bearings. Ceramic bearings may be preferred as waterproof sealing is not required thereby reducing the cost and complexity of the apparatus.
  • the drive shaft may be mounted within the apparatus by means of one or more thrust bearings that act to transfer thrust from the drive shaft to the apparatus.
  • the drive shaft may be mounted within the apparatus within one or more brass bushes.
  • the motor of the apparatus may be a waterproof motor that can be operated in direct contact with water. This may be preferred as it is not necessary to mount such motors in waterproof casing and waterproof motors can be operated in direct contact with water to provide cooling to the water, thereby reducing the need for complex and/or heavy heat sinks.
  • embodiments of the invention comprise a rigid mesh provided completely across the at least one fluid Inlet.
  • a rigid mesh may be formed of any suitable material.
  • a rigid mesh formed of plastic coated metal is provided. This may be preferred as it can provide a sufficiently rigid and strong structure whilst also providing good corrosion resistance.
  • a rigid mesh may have a hexagonal mesh. If formed of appropriate material a rigid mesh may be heat-staked to the at least one fluid inlet in order to avoid gaps or protruding edges around edges of the mesh, which could affect flow efficiency through the fluid flow-path.
  • an intake grate may be provided in the at least one fluid inlet.
  • An intake grate may comprise one or more support members extending across the at least one fluid inlet and arranged to extend in a direction of fluid flow through the at least one fluid inlet. Providing a suitably formed intake grate can increase laminar flow through the at least one fluid inlet.
  • An intake grate can extend across a height of the at least one fluid inlet to transfer force to the intake grate and thereby prevent damage to the at least one fluid inlet during operation of the apparatus.
  • An intake grate can be mounted within an at least one fluid inlet in any appropriate manner including, but not limited to, fastening bolts at or near a periphery of the intake grate.
  • a personal marine propulsion device 1 substantially consisting of a waterjet propulsion apparatus according to an embodiment of the present invention is shown in the Figures.
  • An upper side of the complete device 1 is shown in Figure 1 .
  • the housing 2 encloses most of the components of the device 1 such that all that is visible in Figure 1 are outlets 4 of propulsion passages 3, a fluid inlet 9, and a top part 26 of the fluid inlet 9. Internal components of the device are illustrated in the other Figures and described further below.
  • the housing 2 is formed of plastic and is moulded to substantially enclose the internal components.
  • the device 1 is formed as a backpack and comprises shoulder straps (not shown) attached to a lower side of the housing 2 to allow the device to be worn by a user.
  • a battery pack (not shown) is mounted within the housing to power a motor 7.
  • FIG. 2 A partial cross-section through components of the device 1 of Figure 1 is shown in Figure 2 .
  • this Figure illustrates the relative positioning of an impeller 6, a motor 7, a drive shaft 8, the propulsion passages 3, and the fluid inlet 9.
  • a pre-mesh part 9.1 of the fluid inlet and a post-mesh part of the fluid inlet are shown.
  • a flow path 10 of fluid passing through the device 1 when it is in use is also shown.
  • An intake mesh 21 is position in the fluid inlet 9 and acts to prevent solid objects entering the flow path 10.
  • the intake mesh 21 is a hexagonal mesh formed of epoxy coated metal that is heat staked to the fluid inlet 9 for strength and to minimise any gaps or protruding edges that could affect flow efficiency through the flow path 10.
  • the intake mesh extends completely across the fluid inlet 9.
  • An intake grate 22 is also provided within the fluid inlet.
  • the intake grate 22 comprises three vertically oriented plates that extend along the flow path 10 from a rear side of the intake mesh 21.
  • the intake grate 22 is formed of a thin corrosion resistant material and each plate is bolted within the fluid inlet 9 at a bottom end and are fixed in position at an upper end by means of a fastening bolt 27 that extends through each plate.
  • the intake grate 22 provides support to the top part 26 of the fluid inlet by transferring vertical force away from said top part 26.
  • the intake grate 22 also acts to improve laminar flow through the flow path 10, thereby increasing the efficiency of the apparatus.
  • the flow path 10 through the device is defined by the fluid inlet 9, the impeller 6 and a splitter 11, which itself defines the propulsion passages 3. Details of the splitter 11 are best seen in Figure 3 . Both the fluid inlet 9 and the splitter 11 are unitary moulded components and the fluid inlet 9 and the splitter 11 are connected together around the impeller 6. The splitter 11 and the fluid inlet 9 may be 3D printed components.
  • the unitary moulding of the splitter 11 allows a bearing seat 24 to be formed in which ceramic bearings 13.1, 13.2 of the drive shaft 8 are slotting into position.
  • a radial groove in the splitter 11 also allows a securing ring 23 to be positioned around an outer end of the drive shaft 8.
  • the impeller 6 is located directly in front of the motor 7 and is driven by the motor 7 by means of the drive shaft 8, which extends from the motor, to the impeller.
  • the impeller 6 is connected to the drive shaft 8 by means of a shaft fastener 19.
  • the drive shaft 8 is mounted in the splitter 11 by means of two ceramic bearings 13.1, 13.2 that allow the drive shaft to freely rotate.
  • the drive shaft 8 is mounted within a radial bearing 13.1 and an angular bearing 13.2. Ceramic bearings are used as they do not require watertight sealing.
  • the motor 7 is fixed to the splitter 11 at a front end of the motor.
  • the motor 7 is located between the propulsion passages 3 of the splitter 11.
  • the motor 7 is a waterproof motor that is used in direct contact with water when the apparatus 1 is in use. Contact with water acts to cool the motor 7 such that no heat sink or other cooling means is required.
  • the propulsion passages 3 of the splitter 11 are positioned either side of the motor 7 and each extend from a propulsion input immediately behind the impeller 6 to an output 4 at a rear end of the device 1.
  • the propulsion passages 3 are substantially symmetrically positioned within the splitter 11 and are mirror images of one another.
  • the propulsion passages 3 are substantially circular in cross-section and gradually reduce in diameter from their propulsion input to their output 4. This reduction in diameter helps increase and direct thrust generated by the device 1.
  • Each propulsion passage 3 has six radially extending fins 14 located therein in order to reduce the radial flow of water exiting the passages and to thereby preserve the thrust generated by the impeller 6.
  • the device 1 does not include steering means. Instead the device 1 can be steered by the user orienting their body appropriately.
  • FIG. 4 shows the relative position of the splitter 11, the motor 7, the mesh 21, and an intake grate 22.
  • the motor 7 is positioned between the propulsion passages 3 of the splitter 11.
  • the motor 7 is positioned and the housing 2 are formed such that an outer surface of the motor 7 is in direct contact with water when the device 1 is in use and submerged and thereby provide cooling to the motor.
  • the motor 7 is fixed to a motor mount 20 at a front end.
  • the motor mount 20 is in turn fixed to the splitter 11 to thereby hold the motor 20 in an appropriate position.
  • the motor 20 is connected to the drive shaft 8 by means of a shaft coupler 15.
  • a shoulder 25 is provided on the drive shaft 8 adjacent the shaft coupler 15 to locate the drive shaft 8 in position within the angular bearing 13.2.
  • the splitter 11 is connected to the housing 2 by means of four joint profiles 17 provided on each lateral side of the splitter 11.
  • the joint profiles 17 have eyelets 18 through which the splitter 11 can be mounted to the housing 2 by vibration mounts (not shown) that act to reduce noise and to reduce wear and tear.
  • the impeller 6 When in use the impeller 6 is driven by the motor 7 to rotate via the drive shaft 8. The motion of the impeller 6 creates a reaction force from water, which is transferred axially into the drive shaft 8 via the shaft fastener 19.
  • the shaft shoulder 25 transfers the thrust into the angular bearing 13.2.
  • the thrust transferred into the angular bearing 13.2, from there the reaction force is transferred via the bearing seat 24 into the splitter 11 and then into the housing 2 via the joint profiles 17.
  • the device 1 In use the device 1 is strapped to a user's back and when the user is submerged in water it is turned on.
  • the impeller 6 is then driven by the motor 7 via the drive shaft 8 to draw water through the flow-path 10.
  • water is drawn in the fluid inlet 9, through the impeller 6 and out of the device via the propulsion passages 3.
  • This provides a waterjet propulsion system that acts to propel the user forward.
  • the Speedof the motor 7 the propulsion provided can be controlled appropriately.
  • the user can then steer themselves by moving their body appropriately.
  • a user can control the speed of the motor and can turn the motor on and off control means (not shown) are provided as a handheld controller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19179798.4A 2018-06-13 2019-06-12 Wasserstrahlantriebsvorrichtung Withdrawn EP3581246A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1809698.2A GB2574641B (en) 2018-06-13 2018-06-13 Waterjet propulsion apparatus

Publications (1)

Publication Number Publication Date
EP3581246A1 true EP3581246A1 (de) 2019-12-18

Family

ID=63042229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19179798.4A Withdrawn EP3581246A1 (de) 2018-06-13 2019-06-12 Wasserstrahlantriebsvorrichtung

Country Status (4)

Country Link
US (1) US20190382089A1 (de)
EP (1) EP3581246A1 (de)
AU (1) AU2019204142A1 (de)
GB (1) GB2574641B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115814689A (zh) * 2023-02-14 2023-03-21 北京蓝壳洁能环保技术有限公司 一种化工原料混合装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9925440B2 (en) 2014-05-13 2018-03-27 Bauer Hockey, Llc Sporting goods including microlattice structures
CN109501992A (zh) * 2018-12-21 2019-03-22 青岛海狮网络科技有限公司 Rov泵式轴流推进器及其多功能遥控救生圈
CA3140503C (en) 2019-05-21 2022-06-14 Bauer Hockey Ltd. Helmets comprising additively-manufactured components
CN115924045A (zh) * 2022-12-05 2023-04-07 中国船舶集团有限公司第七〇八研究所 一种双拼式喷水推进进流管道结构

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4958100U (de) * 1972-08-30 1974-05-22
US5123867A (en) * 1990-05-10 1992-06-23 Stefan Broinowski Marine jet propulsion unit
US5469803A (en) * 1992-05-19 1995-11-28 Fem-Aero Individual underwater propulsion device
JP2001301690A (ja) * 1999-05-25 2001-10-31 Toshiba Tec Corp 遊泳補助装置
JP2002316695A (ja) * 2001-04-24 2002-10-29 Sanshin Ind Co Ltd 水ジェット推進艇
US20070277719A1 (en) * 2006-06-05 2007-12-06 West John H Prone operator position personal watercraft
US7992510B2 (en) * 2009-01-29 2011-08-09 Dial Franklin D Personal watercraft
CN204587277U (zh) * 2015-04-01 2015-08-26 陈龙 单人水下推进装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017101146A1 (de) * 2017-01-20 2018-07-26 Cayago Gmbh Schwimm- und Tauchhilfe mit einer Kamera

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4958100U (de) * 1972-08-30 1974-05-22
US5123867A (en) * 1990-05-10 1992-06-23 Stefan Broinowski Marine jet propulsion unit
US5469803A (en) * 1992-05-19 1995-11-28 Fem-Aero Individual underwater propulsion device
JP2001301690A (ja) * 1999-05-25 2001-10-31 Toshiba Tec Corp 遊泳補助装置
JP2002316695A (ja) * 2001-04-24 2002-10-29 Sanshin Ind Co Ltd 水ジェット推進艇
US20070277719A1 (en) * 2006-06-05 2007-12-06 West John H Prone operator position personal watercraft
US7992510B2 (en) * 2009-01-29 2011-08-09 Dial Franklin D Personal watercraft
CN204587277U (zh) * 2015-04-01 2015-08-26 陈龙 单人水下推进装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115814689A (zh) * 2023-02-14 2023-03-21 北京蓝壳洁能环保技术有限公司 一种化工原料混合装置

Also Published As

Publication number Publication date
GB2574641A (en) 2019-12-18
GB2574641B (en) 2020-09-02
AU2019204142A1 (en) 2020-01-16
US20190382089A1 (en) 2019-12-19
GB201809698D0 (en) 2018-08-01

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