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WO2024241635A1 - Dispositif de propulsion et corps mobile - Google Patents

Dispositif de propulsion et corps mobile Download PDF

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Publication number
WO2024241635A1
WO2024241635A1 PCT/JP2024/003899 JP2024003899W WO2024241635A1 WO 2024241635 A1 WO2024241635 A1 WO 2024241635A1 JP 2024003899 W JP2024003899 W JP 2024003899W WO 2024241635 A1 WO2024241635 A1 WO 2024241635A1
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WO
WIPO (PCT)
Prior art keywords
struts
propulsion device
axis
propeller
propeller blades
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.)
Pending
Application number
PCT/JP2024/003899
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English (en)
Japanese (ja)
Inventor
和樹 細野
卓慶 山田
茂樹 妹尾
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.)
Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries 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
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of WO2024241635A1 publication Critical patent/WO2024241635A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • B63H5/15—Nozzles, e.g. Kort-type

Definitions

  • the present disclosure relates to a propulsion device and a moving body.
  • This application claims priority to Japanese Patent Application No. 2023-084458, filed in Japan on May 23, 2023, the contents of which are incorporated herein by reference.
  • Patent Document 1 discloses a propulsion device with a nozzle that can be attached to a ship or the like.
  • struts that support the propeller shaft are provided in front of and behind the propeller blades.
  • a number of struts are provided around the propeller shaft, aligned in the circumferential direction and with equal angular intervals.
  • the propeller shaft is firmly supported by these evenly spaced struts.
  • the present disclosure has been made to solve the above problems, and aims to provide a propulsion device and a moving body that can improve design freedom.
  • the propulsion device comprises a tubular section arranged under the water surface with its axis extending in the front-rear direction, forming a flow path with its front side being the upstream side and its rear side being the downstream side, a shaft section arranged inside the tubular section and extending in the axial direction, a propeller attached to the shaft section, having a plurality of propeller blades extending radially of the axis within the flow path and arranged circumferentially of the axis, and capable of rotating around the axis, and a plurality of struts provided in the flow path at least either in front of or behind the propeller, extending in the radial direction and arranged in the circumferential direction, and supporting the shaft section, the plurality of struts being arranged symmetrically with respect to a line of symmetry that extends in the vertical direction and passes through the axis, at least one of the angular intervals between the struts being different from the
  • the moving body according to the present disclosure is equipped with the above-mentioned propulsion device and is capable of moving on at least one of the water surface and underwater.
  • the propulsion device and moving body disclosed herein can improve design freedom.
  • FIG. 1 is a schematic diagram showing a schematic configuration of a moving body according to a first embodiment of the present disclosure.
  • FIG. 2 is a schematic diagram of the propulsion device according to the first embodiment of the present disclosure, viewed from the left side.
  • FIG. 2 is a schematic diagram showing the arrangement of propeller blades according to the first embodiment of the present disclosure, viewed from the front side.
  • FIG. 2 is a schematic diagram showing the arrangement of struts according to the first embodiment of the present disclosure, viewed from the front side.
  • FIG. 11 is a schematic diagram showing another example of a strut arrangement according to the first embodiment of the present disclosure, as viewed from the front side.
  • FIG. 1 is a schematic diagram showing a schematic configuration of a moving body according to a first embodiment of the present disclosure.
  • FIG. 2 is a schematic diagram of the propulsion device according to the first embodiment of the present disclosure, viewed from the left side.
  • FIG. 2 is a schematic diagram showing the arrangement of propeller blades according to the first
  • FIG. 11 is a schematic diagram showing the arrangement of struts according to a second embodiment of the present disclosure, as viewed from the front.
  • FIG. 11 is a schematic diagram showing the arrangement of struts according to the third embodiment of the present disclosure, as viewed from the front.
  • FIG. 11 is a schematic diagram of a propulsion device according to a fourth embodiment of the present disclosure, viewed from the left side.
  • FIG. 13 is a schematic diagram showing the arrangement of front struts according to the fourth embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram showing the arrangement of rear struts according to a fourth embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram showing a schematic configuration of a moving body according to a modified example of the present disclosure.
  • FIG. 11 is a schematic diagram of a propulsion device according to a modified example of the present disclosure, viewed from the left side.
  • FIG. 11 is a schematic diagram of a propulsion device according to a modified example of the present disclosure, viewed from the left side.
  • FIG. 13 is a schematic diagram showing the arrangement of struts according to a modified example of the present disclosure, as viewed from the front.
  • FIG. 13 is a schematic diagram showing the arrangement of struts according to a modified example of the present disclosure, as viewed from the front.
  • FIG. 1 the moving body 1 of this embodiment is a ship 1a capable of moving on water.
  • the ship 1a includes a hull 2 and a propulsion device 10.
  • the hull 2 is a box-shaped structure that floats on the water surface W.
  • the hull 2 extends in one direction along a horizontal plane.
  • the hull 2 has a bow 3, a stern 4, and a bottom 5.
  • the bow 3 is a portion on one side of the hull 2 in the longitudinal direction.
  • the stern 4 is a portion on the other side of the hull 2 in the longitudinal direction.
  • the bottom 5 forms the lower portion of the hull 2.
  • the bottom 5 extends in the longitudinal direction of the hull 2 and connects the bow 3 and the stern 4.
  • the vertical up-down direction will be simply referred to as the "up-down direction Dv”.
  • the direction along the longitudinal direction of the hull 2 will be referred to as the fore-aft direction Ds
  • the direction along the width of the hull 2 will be referred to as the left-right direction Dw.
  • the upper side will be marked with the symbol “Dvu” and the lower side with the symbol “Dvd”.
  • the front side will be marked with the symbol "Dsf” and the rear side with the symbol “Dsb”.
  • the right side will be marked with the symbol "Dwr” and the left side with the symbol "Dwl”.
  • the propulsion device 10 is attached to the ship bottom 5.
  • the location where the propulsion device 10 is installed is not limited to the ship bottom 5.
  • the propulsion device 10 may be provided as part of an outboard motor mounted on the stern 4.
  • the propulsion device 10 includes a tubular portion 11, a fixing device 12, a shaft portion 13, a propeller 20, a hub 14, and a strut 15.
  • the tubular portion 11 is generally called a nozzle or a duct. In this embodiment, the tubular portion 11 is formed in a cylindrical shape. The tubular portion 11 is disposed under the water surface W such that an axis O extends in the front-rear direction Ds. The tubular portion 11 forms a flow path F with a front side Dsf as the upstream side and a rear side Dsb as the downstream side.
  • the axis O of the tubular portion 11 will be referred to simply as the "axis O”
  • the radial direction of the axis O will be referred to simply as the "radial direction”
  • the circumferential direction of the axis O will be referred to simply as the "circumferential direction”.
  • the direction of the axis O will be assumed to coincide with the front-to-rear direction Ds and to be perpendicular to the up-down direction Dv and the left-to-right direction Dw.
  • the fixing device 12 fixes the tubular portion 11 to the hull 2.
  • the fixing device 12 has a vertical shaft 12a extending downward from the ship bottom 5.
  • the vertical shaft 12a connects the ship bottom 5 and the tubular portion 11.
  • the vertical shaft 12a is provided rotatably with respect to the hull 2. The rotation of the vertical shaft 12a allows the tubular portion 11 to turn left and right.
  • the vertical shaft 12 a may be fixed to the hull 2 .
  • the shaft portion 13 is disposed inside the cylindrical portion 11.
  • the shaft portion 13 is formed in a columnar shape extending in one direction along the axis O.
  • the propeller 20 is attached to the shaft portion 13 and is rotatably attached around the axis O.
  • one propeller 20 is disposed inside the tubular portion 11.
  • the propeller 20 has a propeller hub 21 and propeller blades 22.
  • the propeller hub 21 is an annular member through which the shaft portion 13 is inserted.
  • the propeller blades 22 extend radially outward from the propeller hub 21 inside the flow path F.
  • a plurality of propeller blades 22 are provided and arranged in the circumferential direction. For example, in this embodiment, six propeller blades 22 are provided as shown in FIG. 3 .
  • the hub 14 is provided at an end portion on the front side Dsf in the direction of the axis O of the shaft portion 13.
  • the hub 14 is provided with a plurality of struts 15.
  • the struts 15 are provided in the flow path F on the forward side Dsf of the propeller 20.
  • the struts 15 extend radially from the hub 14 and are connected to the cylindrical portion 11.
  • a plurality of struts 15 are arranged in the circumferential direction.
  • the struts 15 support the shaft portion 13 via the hub 14.
  • the position of the struts 15 can be selected as appropriate. However, it is desirable that the struts 15 are arranged tilted relative to the fore-and-aft direction Ds in the opposite direction to the rotation of the propeller 20. By arranging the struts 15 at an angle in this manner, the struts 15 impart a swirling flow to the flow inside the tube portion 11 in a direction that cancels the swirling flow generated by the propeller 20. Note that the struts 15 may be arranged tilted relative to the fore-and-aft direction Ds in the same direction as the rotation of the propeller 20, or may be arranged along the fore-and-aft direction Ds.
  • the multiple struts 15 are provided in accordance with the following three rules. First, the multiple struts 15 are disposed symmetrically with respect to a line of symmetry L1 that extends in the up-down direction Dv and passes through the axis O (first condition). Secondly, at least one of the angular intervals between the struts 15 is different from the angular intervals between the other struts 15 (second condition). Thirdly, at least one strut 15 is disposed on both sides in the up-down direction Dv with respect to a horizontal plane HS that extends horizontally so as to pass through the axis O (third condition). As long as the above rules (first condition, second condition, and third condition) are satisfied, the number and arrangement of the struts 15 can be changed as appropriate.
  • the placement of the struts 15 is determined in accordance with the following rules as one of the design guidelines.
  • multiple dividing lines L2 that extend radially when viewed from the front-to-rear direction Ds and divide the area around the axis line O into an odd number of equal parts in the circumferential direction.
  • One of the multiple dividing lines L2 is set on the symmetric line L1.
  • the dividing line L2 that is set to coincide with this symmetric line L1 becomes the reference (0 degrees) for setting the other multiple dividing lines L2.
  • these multiple dividing lines L2 are set so that they are symmetrical on the left and right with respect to the symmetric line L1.
  • Each of the N struts 15 is positioned on one of the (N x 2-1) dividing lines L2 when viewed from the front-rear direction Ds.
  • each strut 15 is positioned so that the center line extending radially of the strut 15 coincides with the dividing line L2 when viewed from the axial line O direction.
  • the angular spacing between adjacent struts 15 is set to N' x 360/(N x 2-1) degrees, where N' is greater than or equal to 1 and less than N.
  • multiple struts 15 are positioned so that the angular spacing between the struts 15 is not uniform.
  • N' is 1 for the angular interval between only one pair of adjacent struts
  • N' is 2 for the angular intervals between the other adjacent struts.
  • Each of the N struts 15 is disposed on one of the (N ⁇ 2-1) parting lines L2 when viewed from the front-rear direction Ds.
  • the first angular interval 360/(N ⁇ 2-1) degrees
  • the multiple struts 15 are disposed such that only one of the angular intervals between the struts 15 is different from the angular intervals between the other struts 15.
  • N 3 struts 15 are provided.
  • the propeller 20 is not shown in Fig. 4.
  • one of the five dividing lines L2 is set on a symmetric line L1 extending in the up-down direction Dv.
  • one dividing line L2 on this symmetric line L1 is located above a horizontal plane HS passing through the axis O.
  • the struts 15 are arranged on the dividing line L2 set in this manner so as to satisfy the first angular interval ⁇ 1 and the second angular interval ⁇ 2.
  • the struts 15 and the dividing lines L2 may be inverted in the up-down direction Dv with respect to the axis O.
  • one dividing line L2 on the line of symmetry L1 is located below the horizontal plane HS passing through the axis O.
  • the propulsion device 10 is designed so that there is a common divisor between the number of propeller blades 22 and the number of struts 15.
  • the propulsion device 10 is designed so that the number of propeller blades 22 and the number of dividing lines L2 (N x 2 - 1) are mutually prime.
  • the propulsion device 10 of this embodiment can achieve the following effects.
  • the propulsion device 10 includes a tube portion 11, a shaft portion 13, a propeller 20, and a plurality of struts 15.
  • the tube portion 11 is disposed under the water surface W with its axis O extending in the fore-and-aft direction Ds, forming a flow path F with the front side Dsf being the upstream side and the rear side Dsb being the downstream side.
  • the shaft portion 13 is disposed inside the tube portion 11 and extends in the direction of the axis O.
  • the propeller 20 is attached to the shaft portion 13, has a plurality of propeller blades 22 extending in the radial direction of the axis O within the flow path F and arranged in the circumferential direction of the axis O, and is rotatable around the axis O.
  • the plurality of struts 15 are provided on the front side Dsf of the propeller 20 within the flow path F, extend in the radial direction, and are arranged in the circumferential direction, supporting the shaft portion 13.
  • the plurality of struts 15 are disposed symmetrically with respect to the line of symmetry L1 extending in the up-down direction Dv (first condition).
  • At least one of the angular intervals between the struts 15 is different from the angular intervals between the other struts 15 (second condition). Also, at least one strut 15 is disposed on both sides of the horizontal plane HS that extends horizontally and passes through the axis O in the up-down direction Dv (third condition).
  • multiple struts 15 are arranged symmetrically with respect to a line of symmetry L1 extending in the up-down direction Dv. This makes it possible to suppress bias in the force acting on the struts 15 when turning. Therefore, the force acting on the struts 15 when turning is the same on the left and right, suppressing bias in the water flow load to either the left or right, and ensuring sufficient turning performance.
  • the struts 15 and the propeller blades 22 overlap, slowing down the flow rate of the air flowing into the propeller blades 22 and causing thrust fluctuations.
  • at least one of the angular intervals between the struts 15 is different from the angular intervals between the other struts 15. This makes it possible to reduce the area where multiple struts 15 and multiple propeller blades 22 overlap at one time. This makes it possible to reduce thrust fluctuations. Furthermore, the efficiency of the propeller 20 can be further improved.
  • At least one strut 15 is arranged on both sides in the up-down direction Dv with respect to a horizontal plane HS that extends horizontally so as to pass through the axis O. This allows the struts 15 to support the shaft portion 13 from both sides in the up-down direction Dv. This improves the strength of the propulsion device 10.
  • the propulsion device 10 can fully perform the required functions.
  • the degree of freedom in design can be improved.
  • the number of struts 15 can be freely determined solely from the viewpoint of strength, regardless of the structure, such as the number of propeller blades 22. Therefore, the arrangement of struts 15 in this embodiment can be applied to any propeller 20, improving the degree of freedom in design. For this reason, thrust fluctuations can be suppressed while keeping the number of struts 15 to the minimum necessary to ensure strength. Because the number of struts 15 is not increased unnecessarily, the resistance caused by the struts 15 themselves can also be reduced.
  • each of the N struts 15 is disposed on one of (N x 2-1) dividing lines L2 that equally divide the area around the axis O in the circumferential direction.
  • N' which is 1 or more but less than N
  • the angular interval between the struts 15 is N' x 360/(N x 2-1) degrees.
  • the struts 15 can be positioned based on the dividing line L2, making it easy to position the struts 15. This makes it easy to design the propulsion device 10.
  • the above-mentioned strut 15 arrangement conditions (first condition, second condition, and third condition) can be easily met. This improves design efficiency.
  • the number of locations with different angular intervals can be limited to one, making it easier to control the flow rate between the struts 15.
  • each of the N struts 15 is disposed on one of the (N x 2-1) dividing lines L2 that equally divide the area around the axis O in the circumferential direction.
  • the above-mentioned strut 15 placement conditions can be met simply by setting a division line L2 and placing the struts 15 on the division line L2.
  • the number of dividing lines L2 (N x 2 - 1) is different from the number of propeller blades 22.
  • the area where the parting line L2 and the propeller blade 22 overlap at one time can be reduced. Because the strut 15 is positioned on the parting line L2, the area where the strut 15 and the propeller blade 22 overlap at one time can be reduced. This makes it possible to further reduce thrust fluctuations. This allows the strut 15 to be positioned even more effectively.
  • the number of propeller blades 22 and the number of struts 15 may have a common divisor (however, the propulsion device 10 is designed so that when the number of struts 15 is N, the number of propeller blades 22 and the number of dividing lines L2 (N x 2 - 1) are mutually prime).
  • the numbers and arrangements of the propeller blades 22 and struts 15 there are more options for the numbers and arrangements of the propeller blades 22 and struts 15 than when, for example, the number of propeller blades 22 and the number of struts 15 are restricted to having no common divisor (when the number of propeller blades 22 and the number of struts 15 are prime to each other), thereby further improving the degree of freedom in design.
  • the number of dividing lines L2 (N ⁇ 2 ⁇ 1) and the number of propeller blades 22 are relatively prime, the number of dividing lines L2 that overlap with the propeller blades 22 can be restricted to 1. Because the struts 15 are disposed on the dividing lines L2, the number of struts 15 that overlap with the propeller blades 22 at one time can be restricted to 1. Therefore, thrust fluctuations can be further reduced.
  • N 5 struts 15.
  • one of the nine dividing lines L2 is set on a symmetric line L1 extending in the up-down direction Dv.
  • the one dividing line L2 on the symmetric line L1 is located above a horizontal plane HS passing through the axis O.
  • the struts 15 are arranged on the dividing line L2 set in this manner so as to satisfy the first angular interval ⁇ 1 and the second angular interval ⁇ 2.
  • the struts 15 and the dividing lines L2 may be inverted in the up-down direction Dv with respect to the axis O.
  • one dividing line L2 on the line of symmetry L1 is located below the horizontal plane HS passing through the axis O.
  • five struts 15 are provided for six propeller blades 22. That is, in this modified example, there is no common divisor between the number of propeller blades 22 and the number of struts 15.
  • the propulsion device 10 is designed so that the number of propeller blades 22 is different from the number of dividing lines L2 (N x 2 - 1).
  • Fig. 6 is a drawing corresponding to Fig. 4 of the first embodiment.
  • the propeller 20 is omitted.
  • one of the seven dividing lines L2 is set on a symmetric line L1 extending in the up-down direction Dv.
  • the one dividing line L2 on the symmetric line L1 is located below a horizontal plane HS passing through the axis O.
  • the struts 15 are arranged on the dividing line L2 set in this manner so as to satisfy the first angular interval ⁇ 1 and the second angular interval ⁇ 2.
  • the propulsion device 110 of this embodiment can achieve the following effects.
  • propellers 20 have three to six propeller blades 22. In the most common case where the propeller blades 22 are three to six, it is appropriate to have four struts 15 and arrange them on seven dividing lines L2, as in this embodiment, in order to ensure strength and thrust. Therefore, this embodiment can be applied to many propellers 20, making it versatile.
  • the number of struts 15 that overlap the propeller blades 22 at one time while the propeller 20 is in motion can be limited to one. This makes it possible to further suppress thrust fluctuations.
  • the four struts 15 are arranged on the eleven dividing lines L2 so as to satisfy the first, second, and third conditions.
  • the propulsion device 210 of this embodiment can achieve the following effects.
  • each of the N struts 15 is positioned on one of the (M ⁇ 2-1) dividing lines L2 that evenly divide the area around the axis O in the circumferential direction.
  • the number and arrangement of struts 15 can be chosen to provide more options, thereby further improving the freedom of strut 15 arrangement.
  • the number of struts 15 can be increased to improve the strength of the propulsion device 10.
  • the number of struts 15 is increased by an even number based on the line of symmetry L1 that extends in the vertical direction Dv and passes through the axis O, so the left-right symmetry of the struts 15 is not compromised.
  • the propulsion device 310 of this embodiment is designed with a double structure having two propellers 20 arranged side by side in the fore-and-aft direction Ds.
  • the two propellers 20 are arranged so that they can rotate in opposite directions.
  • the number of propeller blades 22 of each propeller in this manner, the number of times the front and rear propeller blades 22 overlap at the same time is reduced, which is effective in reducing thrust fluctuations.
  • the struts 15 are provided as follows.
  • the struts 15 are provided on the front side Dsf and the rear side Dsb with respect to the two propellers. As shown in Figures 9 and 10, the arrangement of the multiple struts 15 on the rear side Dsb is an inverted arrangement of the multiple struts 15 on the front side Dsf.
  • the struts 15 that are forward of the propeller 20 (Dsf) will be referred to as the forward struts 15a
  • the struts 15 that are rearward of the propeller 20 (Dsb) will be referred to as the rearward struts 15b.
  • one of the seven dividing lines L2 is set on the symmetric line L1 extending in the up-down direction Dv.
  • the one dividing line L2 on the symmetric line L1 is located below the horizontal plane HS passing through the axis O.
  • the front strut 15a is disposed on the dividing line L2 set in this manner so as to satisfy the first angular interval ⁇ 1 and the second angular interval ⁇ 2.
  • the position of the front strut 15a can be selected as appropriate.
  • the front strut 15a is arranged tilted relative to the fore-and-aft direction Ds.
  • the tilt of the front strut 15a causes a swirling flow to flow into the propeller 20.
  • the number of rear struts 15b is the same as the number of front struts 15a, that is, four.
  • one of the seven dividing lines L2 is set on the symmetric line L1 extending in the up-down direction Dv.
  • the one dividing line L2 on the symmetric line L1 is located above the horizontal plane HS passing through the axis O.
  • the rear strut 15b is disposed on the dividing line L2 set in this manner so as to satisfy the first angular interval ⁇ 1 and the second angular interval ⁇ 2.
  • the position of the rear strut 15b can be selected as appropriate.
  • the rear strut 15b is arranged along the fore-and-aft direction Ds. This redirects the swirling flow discharged from the propeller 20 into a direct current in the fore-and-aft direction Ds.
  • the propulsion device 310 of this embodiment can achieve the following effects.
  • two propellers 20 are provided side by side in the fore-and-aft direction Ds.
  • the two propellers 20 are provided so as to rotate in opposite directions.
  • the struts 15 are provided on the front side Dsf and the rear side Dsb of the two propellers 20, and the arrangement of the multiple struts 15 on the rear side Dsb is an upside-down arrangement of the multiple struts 15 on the front side Dsf.
  • the swirling flow discharged from the propeller 20 on the front side Dsf can be countered by the propeller 20 on the rear side Dsb. Therefore, by tilting the struts 15 on the front side Dsf (front struts 15a) in the fore-and-aft direction Ds, there is no need to impart a swirling flow to the water flow, and the arrangement of the struts 15 can be designed taking into account only the necessary strength. This allows for even greater freedom in design.
  • the number and arrangement of the struts 15 must be determined taking into account the structure of the two propellers 20, making the consideration of the number and arrangement of the struts 15 complicated.
  • the arrangement conditions for the struts 15 in front of and behind the propeller 20 can be easily met. This can improve manufacturing efficiency.
  • the moving body 1 is a ship 1a that moves on water, but the present invention is not limited to this.
  • the moving body 1 may be an oceanographic research vessel 1b that can move underwater.
  • the moving body 1 on which the propulsion device 10 is mounted may be designed to be capable of moving both on water and underwater.
  • propeller blades 22 are provided for each propeller 20, but this is not limited to the above.
  • the number of propeller blades 22 can be changed as appropriate, and the number of propeller blades 22 may be, for example, 2, 3, 4, 5, 7, 8, etc.
  • the number of struts 15 is three or five and the number of dividing lines L2 is five or nine is described
  • the second embodiment a case where the number of struts 15 is four and the number of dividing lines L2 is seven is described
  • the third embodiment a case where the number of struts 15 is four and the number of dividing lines L2 is eleven is described, but this is not limited to this.
  • the number of struts 15 and the number of dividing lines L2 can be changed as appropriate.
  • the strut 15 is provided in the flow path F on the forward side Dsf of the propeller 20, but this is not limited to the above. As shown in FIG. 12, the strut 15 may be provided in the flow path F on the rearward side Dsb of the propeller 20.
  • the strut 15 is provided along the fore-and-aft direction Ds and redirects the swirling flow flowing out from the propeller 20 into a direct current in the fore-and-aft direction Ds.
  • thrust is also generated by the strut 15 on the rearward side Dsb, and the thrust of the propulsion device 10, 110, 210 as a whole is increased.
  • the struts 15 may be provided on both the front side Dsf and the rear side Dsb of the propeller 20 within the flow path F.
  • each strut 15 is arranged so that, when viewed from the direction of axis O, the center line extending radially of the strut 15 coincides with the division line L2," but this is not limited to the above. Since the strut 15 has a circumferential thickness, it may be stated that “the strut 15 is arranged on the division line L2" as long as at least a portion of the strut 15 is located on the division line L2 when viewed from the direction of axis O. In other words, the angular spacing between the struts 15 may be slightly offset from the angular spacing between the corresponding division lines L2.
  • the struts 15 are arranged on the dividing line L2, but this is not limited to the above. As long as the arrangement of the struts 15 satisfies the first, second and third conditions, the struts 15 do not have to be arranged on the dividing line L2. For example, as shown in FIG. 14, some of the struts 15 may be arranged at positions offset from the dividing line L2 when viewed from the front-rear direction Ds. In the example of FIG. 14, the struts 15 are arranged at 0 degrees, approximately 135 degrees and approximately 225 degrees relative to the dividing line L2 which are 0 degrees, 72 degrees, 144 degrees, 216 degrees, 288 degrees and 360 degrees.
  • the propulsion devices 10, 110, 210, 310 and the moving body 1 described in each embodiment can be understood, for example, as follows.
  • the propulsion device 10, 110, 210, 310 includes a tubular portion 11 arranged under the water surface W with the axis O extending in the fore-and-aft direction Ds, forming a flow path F with the front side Dsf on the upstream side and the rear side Dsb on the downstream side, a shaft portion 13 arranged inside the tubular portion 11 and extending in the direction of the axis O, a propeller 20 attached to the shaft portion 13, having a plurality of propeller blades 22 extending radially about the axis O within the flow path F and arranged circumferentially about the axis O, and capable of rotating around the axis O, and a front side Dsf and a rear side Dsb on the downstream side relative to the propeller 20 within the flow path F.
  • a plurality of struts 15 that are provided on at least one of the sides Dsb, extend in the radial direction, are arranged in the circumferential direction, and support the shaft portion 13, and the plurality of struts 15 are arranged symmetrically with respect to a line of symmetry L1 that extends in the vertical direction Dv and passes through the axis O, and at least one of the angular intervals between the struts 15 is different from the angular intervals between the other struts 15, and at least one of the struts 15 is arranged on both sides in the vertical direction Dv with respect to a horizontal plane HS that extends horizontally so as to pass through the axis O.
  • the struts 15 are arranged symmetrically with respect to a line of symmetry L1 that extends in the vertical direction Dv. This makes it possible to suppress the bias of the force acting on the struts 15 from side to side during turning.
  • the struts 15 and the propeller blades 22 overlap, slowing down the flow rate of the air flowing into the propeller blades 22 and causing thrust fluctuations.
  • at least one of the angular intervals between the struts 15 is different from the angular intervals between the other struts 15. This makes it possible to reduce the area where multiple struts 15 and multiple propeller blades 22 overlap at one time. This makes it possible to reduce thrust fluctuations. Also, the efficiency of the propeller 20 can be further improved.
  • At least one strut 15 is arranged on both sides in the up-down direction Dv with respect to a horizontal plane HS that extends horizontally so as to pass through the axis O. This allows the struts 15 to support the shaft portion 13 from both sides in the up-down direction Dv. This improves the strength of the propulsion devices 10, 110, 210, 310.
  • the propulsion devices 10, 110, 210, 310 can fully perform the required functions.
  • the degree of freedom in design can be improved.
  • the number of struts 15 can be freely determined from the viewpoint of strength alone, regardless of the structure, such as the number of propeller blades 22.
  • the second aspect of the propulsion device 10, 110, 210, 310 may be the first aspect of the propulsion device 10, 110, 210, 310, in which only one of the angular intervals between the struts 15 is different from the angular intervals between the other struts 15.
  • the strut 15 placement conditions of the first embodiment described above can be easily met.
  • the number of locations with different angular intervals can be limited to one, making it easier to control the flow rate between the struts 15.
  • the propulsion device 10, 110 of the third aspect is the propulsion device 10, 110, 210 of the first or second aspect, in which each of the N struts 15 is arranged on one of (N x 2-1) dividing lines L2 that divide the area around the axis O evenly in the circumferential direction, and the angular interval between the struts 15 may be any of N' x 360/(N x 2-1) degrees, where N' is 1 or more but less than N.
  • the strut 15 can be positioned based on the dividing line L2, making it easy to position the strut 15.
  • the propulsion device 10, 110 of the fourth aspect is the propulsion device 10, 110 of the third aspect, and the number of the dividing lines L2 (N ⁇ 2 ⁇ 1) and the number of the propeller blades 22 may be mutually prime.
  • the number of parting lines L2 that overlap the propeller blades 22 can be reduced to one. Because the struts 15 are arranged on the parting lines L2, the number of struts 15 that overlap the propeller blades 22 at one time can be reduced to one. Therefore, thrust fluctuations can be further reduced.
  • the propulsion device 10, 110 of the fifth aspect is the propulsion device 10, 110, 210 of the third or fourth aspect, and the number of the division lines L2 (N x 2 - 1) may be different from the number of the propeller blades 22.
  • the area where the dividing line L2 and the propeller blade 22 overlap at one time can be reduced. Because the strut 15 is disposed on the dividing line L2, the area where the strut 15 and the propeller blade 22 overlap at one time can be reduced. Therefore, thrust fluctuations can be further reduced.
  • propellers 20 have three to six propeller blades 22. In the most common case where the number of propeller blades 22 is three to six, it is appropriate to have four struts 15 and arrange them on seven dividing lines L2 as in this embodiment in order to ensure strength and thrust. This embodiment can therefore be applied to many propellers 20, making it versatile. Furthermore, it is easy to arrange multiple struts 15 symmetrically with respect to the line of symmetry L1 extending in the vertical direction Dv. This makes it easy to design a system that suppresses the left-right bias of the force generated in the struts 15 during turning, making this embodiment suitable from the perspective of structural design as well.
  • the seventh aspect of the propulsion device 210 may be the propulsion device 210 of the first or second aspect, in which each of the N struts 15 may be arranged on any of the (M x 2 - 1) dividing lines L2 that divide the area around the axis O evenly in the circumferential direction, where M ⁇ N.
  • the number and arrangement of struts 15 can be chosen more freely, further improving the degree of freedom in the arrangement of struts 15.
  • the eighth aspect of the propulsion device 310 is any one of the propulsion devices 310 of the first to seventh aspects, in which the propellers 20 are arranged in two in the fore-and-aft direction Ds, the two propellers 20 are arranged to rotate in opposite directions, and the struts 15 are arranged in multiple numbers on the front side Dsf and the rear side Dsb of the two propellers 20, and the arrangement of the multiple struts 15 on the rear side Dsb may be an arrangement that is upside down from the arrangement of the multiple struts 15 on the front side Dsf.
  • the swirling flow discharged from the propeller 20 on the front side Dsf can be countered by the propeller 20 on the rear side Dsb. Therefore, by tilting the struts 15 on the front side Dsf in the fore-and-aft direction Ds, there is no need to impart a swirling flow to the water flow, and the arrangement of the struts 15 can be designed taking into account only the necessary strength. This allows for even greater freedom in design.
  • struts 15 when struts 15 are normally placed in front of and behind two propellers 20 aligned in the fore-and-aft direction Ds, the number and placement of struts 15 must be determined taking into account the structure of the two propellers 20, making consideration of the number and placement of struts 15 complicated.
  • the placement conditions for each strut 15 in front of and behind the propeller 20 can be easily met.
  • the ninth aspect of the propulsion device 10, 110, 210, 310 is any one of the propulsion devices 10, 110, 210, 310 of the first to eighth aspects, and there may be a common divisor between the number of the propeller blades 22 and the number of the struts 15.
  • a moving body 1 of a tenth aspect is equipped with any one of the propulsion devices 10, 110, 210, 310 of the first to ninth aspects, and is capable of moving at least either on water or underwater.
  • Examples of the moving body 1 include the above-mentioned ship 1a and oceanographic research vessel 1b.
  • the propulsion device and moving body disclosed herein can improve design freedom.

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  • 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)

Abstract

La présente invention concerne un dispositif de propulsion comprenant : une partie cylindrique disposée de telle sorte que son axe s'étend dans une direction avant-arrière sous la surface de l'eau, et formant un trajet d'écoulement ; une partie arbre disposée à l'intérieur de la partie cylindrique et s'étendant dans la direction axiale ; une hélice qui est fixée à la partie arbre, a une pluralité de pales d'hélice qui s'étendent dans la direction radiale de l'axe dans le trajet d'écoulement et qui sont agencées dans la direction circonférentielle de l'axe, et qui est apte à tourner autour de l'axe ; et une pluralité d'entretoises qui sont disposées dans le trajet d'écoulement sur le côté avant et/ou le côté arrière par rapport à l'hélice, s'étendent dans la direction radiale et sont agencées dans la direction circonférentielle, et supportent la partie arbre. La pluralité d'entretoises s'étendent dans une direction verticale et sont disposées symétriquement par rapport à une ligne de symétrie qui passe à travers l'axe. Parmi les intervalles angulaires entre les entretoises, au moins un intervalle angulaire est différent de l'intervalle angulaire entre les autres entretoises, et au moins une entretoise est disposée de chaque côté dans la direction verticale par rapport à un plan horizontal qui s'étend dans la direction horizontale de façon à passer à travers l'axe.
PCT/JP2024/003899 2023-05-23 2024-02-06 Dispositif de propulsion et corps mobile Pending WO2024241635A1 (fr)

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JP2023084458A JP2024168065A (ja) 2023-05-23 2023-05-23 推進装置、及び移動体
JP2023-084458 2023-05-23

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WO2024241635A1 true WO2024241635A1 (fr) 2024-11-28

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59160697A (ja) * 1982-12-17 1984-09-11 ライセンテイア・パテント−フエルヴアルトウンクス−ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフトウンク 電気的に駆動される船用プロペラ
US5722866A (en) * 1993-03-02 1998-03-03 Brandt; Lennart Propulsion arrangement for a marine vessel
JP2011025918A (ja) * 2009-07-23 2011-02-10 Becker Marine Systems Gmbh & Co Kg 船舶用ノズルプロペラ
US9821896B2 (en) 2012-05-08 2017-11-21 Rolls-Royce Marine As Propulsion unit for maritime vessel including a nozzle exhibiting a curved following edge at the outlet of the nozzle
WO2018193149A1 (fr) * 2017-04-18 2018-10-25 Abb Oy Unité de propulsion
JP2023084458A (ja) 2021-12-07 2023-06-19 大成化工株式会社 Ｐｔｐ包装シート

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59160697A (ja) * 1982-12-17 1984-09-11 ライセンテイア・パテント−フエルヴアルトウンクス−ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフトウンク 電気的に駆動される船用プロペラ
US5722866A (en) * 1993-03-02 1998-03-03 Brandt; Lennart Propulsion arrangement for a marine vessel
JP2011025918A (ja) * 2009-07-23 2011-02-10 Becker Marine Systems Gmbh & Co Kg 船舶用ノズルプロペラ
US9821896B2 (en) 2012-05-08 2017-11-21 Rolls-Royce Marine As Propulsion unit for maritime vessel including a nozzle exhibiting a curved following edge at the outlet of the nozzle
WO2018193149A1 (fr) * 2017-04-18 2018-10-25 Abb Oy Unité de propulsion
JP2023084458A (ja) 2021-12-07 2023-06-19 大成化工株式会社 Ｐｔｐ包装シート

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