JP-7854912-B2 - propulsion device

JP7854912B2JP 7854912 B2JP7854912 B2JP 7854912B2JP-7854912-B2

Inventors

山田卓慶
細野和樹

Assignees

三菱重工業株式会社

Dates

Publication Date: 20260507
Application Date: 20220929

Claims (6)

A shroud having a cylindrical shape that forms a flow path with one side in the axial direction being the upstream side and the other side in the axial direction being the downstream side, and having a recess that is recessed from the inner circumferential surface and extends in the circumferential direction of the axis, A propeller comprising: a plurality of blades extending radially along the axis and arranged circumferentially within the flow path; and a cylindrical propeller that extends more axially than the blades with respect to the axis, is housed in the recess, and has an outer rim connecting the plurality of blades, and is rotatable around the axis; A motor having a rotor provided on the outer rim and a stator provided on the shroud, A cover is provided to cover the portion of the opening of the recess that excludes the rotational trajectory of the blade, On at least one of the inner circumferential surface of the shroud and the radially inward inner surface of the cover, a guide vane is provided so as to be located upstream of the propeller and is adjacent to the blade at a distance in the axial direction, Equipped with, The propulsion device comprises guide vanes that extend in the axial direction and curve in the direction of rotation of the propeller as they move downstream .
The propulsion device according to claim 1, wherein the radially inner surface of the cover is smoothly connected to the inner circumferential surface of the shroud.
The propulsion device according to claim 1 or 2, wherein the inner surface of the outer peripheral rim is located radially outward from the inner surface of the shroud, and the radially inward inner surface of the cover is located at the same radial position as the inner surface of the shroud at the connection point with the shroud.
The propulsion device according to claim 1 or 2, wherein the cover is attached to the inner circumferential surface of the shroud from the radially inward side.
The propeller is arranged in multiple stages in the axial direction, The propulsion device according to claim 1 or 2 , wherein the guide vanes are provided on each stage of the propeller which is arranged in the axial direction.
A shroud having a cylindrical shape that forms a flow path with one side in the axial direction being the upstream side and the other side in the axial direction being the downstream side, and having a recess that is recessed from the inner circumferential surface and extends in the circumferential direction of the axis, A propeller comprising: a plurality of blades extending radially along the axis and arranged circumferentially within the flow path; and a cylindrical propeller that extends more axially than the blades with respect to the axis, is housed in the recess, and has an outer rim connecting the plurality of blades, and is rotatable around the axis; A motor having a rotor provided on the outer rim and a stator provided on the shroud, On the inner circumferential surface of the shroud, guide vanes are provided so as to be located upstream of the propeller and are adjacent to the blades with a gap in the axial direction, Equipped with, A propulsion device in which the guide vanes extend in the axial direction and curve in the direction of rotation of the propeller as they move downstream.

Description

This disclosure relates to a propulsion system. Patent Document 1 discloses a propulsion system for use on maritime vessels and the like. This propulsion system comprises a central shaft that houses a motor and rotates using the motor's driving force, a plurality of blades provided on the outer surface of the central shaft, and a shroud surrounding these blades from the outer periphery. Furthermore, there are propulsion systems that position the motor's stator on the shroud side. In such systems, for example, an outer rim is provided at the outer circumference end of the blade, forming a cylindrical shape that extends axially and runs circumferentially. A rotor is positioned on this outer rim. This type of propulsion system generates thrust by rotating the blade due to the repulsive force the rotor on the outer rim receives from the stator on the shroud side. Special Publication No. 2009-513421 This is a cross-sectional view showing the configuration of a propulsion device according to the first embodiment of this disclosure.This is a view of the propulsion device according to the first embodiment of this disclosure, as seen from the upstream side.This is a schematic partial unfolded view showing an example of each component of the propulsion device according to the first embodiment of this disclosure, viewed from the radially inner side.This is a partial cross-sectional view showing the configuration of a propulsion device according to a first modified example of the first embodiment of the present disclosure.This is a partial cross-sectional view showing the configuration of a propulsion device according to a second modified example of the first embodiment of the present disclosure.This is a partial cross-sectional view showing the configuration of a propulsion device according to a third modified example of the first embodiment of the present disclosure.This is a partial cross-sectional view showing the configuration of a propulsion device according to a second embodiment of this disclosure.This is a schematic partial unfolded view showing an example of each component of the propulsion device according to the second embodiment of this disclosure, viewed from the radially inner side.This is a partial cross-sectional view showing the configuration of a propulsion device according to the third embodiment of this disclosure.This is a schematic partial unfolded view showing an example of each component of the propulsion device according to the third embodiment of this disclosure, viewed from the radially inner side.This is a partial cross-sectional view showing the configuration of a propulsion device according to the fourth embodiment of this disclosure.This is a schematic partial unfolded view showing an example of each component of the propulsion device according to the fourth embodiment of this disclosure, viewed from the radially inner side. <First Embodiment> Hereinafter, the propulsion device 1 according to the first embodiment of this disclosure will be described with reference to Figures 1 to 3. The propulsion device 1 is an outer-circumference drive propulsion device used, for example, in ships or underwater vehicles used for seabed surveys. As shown in Figures 1 and 2, the propulsion system 1 comprises a shroud 10, a central shaft 20, a strut 2, an inner bearing 3, a propeller 30, a motor 40, and a cover 50. (Shroud) The shroud 10 is installed on the bottom of a ship (not shown) and is entirely immersed in a fluid such as water. The shroud 10 is cylindrical with axis Ac as its center. As a result, a flow path P is formed inside the shroud 10, extending in the direction of axis Ac. One side of the flow path P in the direction of axis Ac is designated as the upstream side Du, and the other side in the direction of axis Ac is designated as the downstream side Dd. In the following, the axis Ac of the shroud 10 will be simply referred to as "axis Ac," the circumferential direction Dc of axis Ac will be simply referred to as "circumferential direction Dc," and the radial direction of axis Ac will be simply referred to as "radial direction." Furthermore, the upstream side Du of the flow path P within the shroud 10 will be simply referred to as "upstream side Du," and the downstream side Dd of the flow path P within the shroud 10 will be simply referred to as "downstream side Dd." The outer circumferential surface 10a of the shroud 10 is curved in a convex shape toward the radially outward direction with respect to the axis Ac. The inner circumferential surface 10b of the shroud 10 is curved in a convex shape toward the radially inward direction. In a cross-sectional view including the axis Ac, the length of the periphery of the inner circumferential surface 10b of the shroud 10 is set to be shorter than that of the outer circumferential surface 10a. In other words, the shroud 10 has an airfoil-shaped cross-section. Furthermore, the shroud 10 has a recess 11 that is recessed radially outward from the inner