KR20180101191A - Propulsion apparatus for ship and ship - Google Patents

Abstract

A marine apparatus for propelling and a ship suppress an occurrence of a hub vortex and comprises: a propeller shaft (22) rotationally supported at a rear unit of a hull (12); and a propeller (21) connected to an axial end unit of the propeller shaft (22). The propeller (21) includes: a boss (32) fixed to the end unit of the propeller shaft (22); a plurality of propeller blades (33) fixed to the outer periphery of the boss (32) at a predetermined interval in the circumferential direction; and a guide vane (41) formed along the rotary direction (A) of the propeller (21) so as to protrude from the negative pressure surface (33a) of the propeller blade (33) at the rotary center (O) side in the radial direction of the propeller (21).

Description

[0001] PROPULATION APPARATUS FOR SHIP AND SHIP [0002]

The present invention relates to a propulsion device for a ship using a screw propeller, and a ship equipped with the propulsion device of the ship.

A general propulsion system of a ship is to rotate the screw propeller by the main machine to obtain propulsion. In such a propulsion device for a ship, it is known that a hub vortex is generated from a hub portion which is a support portion of a screw propeller. This hub vortex is caused by the rotation of the screw propeller and is a loss of energy. Since the ship is adversely affected by the generation of the drag on the screw propeller due to the induction resistance caused by the hub vortex, the energy of the vortex of the hub is recovered or the vortex of the hub is diffused to mitigate adverse effects on the thrust. For example, there are those described in the following patent documents.

Japanese Laid-Open Patent Publication No. 2009-051283 Japanese Laid-Open Patent Publication No. 2010-215187 Japanese Laid-Open Patent Publication No. 2013-129408

All of the above-described patent publications diffuse the hub vortex generated from the hub portion of the screw propeller, and do not suppress the occurrence of the hub vortex itself. Therefore, there is a possibility that cavitation may occur due to this hub vortex, the hull vibrates through the stern bottom, and there is a case where an europole transition occurs in the propeller, which adversely affects the durability of the propeller.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a propulsion device and a ship for a ship which suppresses occurrence of hub vortices.

In order to achieve the above object, a propulsion device for a ship of the present invention comprises a propeller shaft rotatably supported at a rear portion of a hull, and a propeller connected to an end portion in an axial direction of the propeller shaft, A plurality of propeller blades fixed to the outer circumferential portion of the boss at a predetermined interval in a circumferential direction and a plurality of propeller blades fixed to the outer circumferential portion of the boss at a predetermined distance from the outer circumferential portion of the propeller shaft, And a guide vane formed along the rotational direction of the propeller so as to protrude from the propeller.

Therefore, by forming the guide vanes along the rotational direction of the propeller so as to protrude from the surface of the propeller blade, the water flow that flows on the surface of the propeller blade when the propeller rotates is guided in a predetermined direction by the guide vane, And flows along the circle line. Then, when the water flow flowing on the negative pressure surface of the propeller blade and the water flow flowing on the static pressure surface join at the rear edge of the propeller blade, the direction of each water flow is approximated to suppress the occurrence of vortexes, can do.

In the propulsion device for a ship of the present invention, the guide vane is disposed in a region from the rear edge side in the rotational direction of the propeller blade to the 1/10 radius of the propeller from the outer peripheral surface of the boss .

Therefore, by arranging the guide vane at the optimum position in the rotation direction and the radial direction of the propeller blade, it is possible to appropriately guide the water flow flowing on the surface of the propeller blade, and the generation of the hub swirl can be effectively suppressed.

In the propulsion device for a ship of the present invention, the guide vane is formed on at least one of a negative pressure side and a static pressure side of the propeller blade.

Therefore, by forming the guide vane on at least one of the negative pressure surface side and the static pressure surface side of the propeller blade, it is possible to appropriately guide the water flow flowing on the negative pressure surface side or the static pressure surface side of the propeller blade.

In the propulsion device for a ship of the present invention, the guide vane is arranged so as to oppose the marginal stream line on the blade surface of the propeller blade.

Therefore, by arranging the guide vanes so as to oppose the limiting stream line on the blade surface, it is possible to effectively correct the water flow flowing on the negative pressure side or the static pressure side of the propeller blade.

In the propulsion apparatus for a ship of the present invention, the guide vanes on either the negative pressure side or the positive pressure side of the propeller vanes are disposed along the limiting wavy line on the wing surface generated on either the negative pressure side or the static pressure side of the propeller vane .

Therefore, by arranging the guide vane along the limiting stream line on the wing surface generated on the surface of the opposite side, the water flow along the negative stream pressure side of the propeller blade and the limited stream line on the one wing surface of the static pressure side is adjusted to the other water stream by the guide vane By correcting, generation of the hub vortex can be effectively suppressed.

In the propulsion device for a ship of the present invention, at an intersection of a back edge of the propeller blade in the rotation direction on an extension line along the guide vane formed on one of the negative pressure surface side and the static pressure surface side, The angle formed between the tangent of the extension line along the guide vane and the tangential line of the limiting wire on the other of the negative pressure surface side and the static pressure surface side at the intersection is set in the range of 0 to 5 degrees .

Therefore, by providing a margin in the attachment angle of the guide vane, the effect of suppressing the generation of the hub vortex can be sufficiently secured, and the preparation can be improved.

In the propulsion device for a ship of the present invention, the guide vane is formed in a range of 0 to 5 degrees with respect to an attachment surface orthogonal to the surface of the propeller blade.

Therefore, by providing a margin in the attachment angle of the guide vane, the effect of suppressing the generation of the hub vortex can be sufficiently secured, and the preparation can be improved.

In the propulsion device for a ship of the present invention, the guide vane is set to have a length in a rotating direction of the propeller blade longer than a length in a direction perpendicular to the surface of the propeller blade.

Therefore, the guide vane can be set to the optimum shape according to the shape of the propeller blade.

In the propulsion device for a ship of the present invention, the guide vanes are formed in a plurality of a predetermined distance in the radial direction of the propeller on the negative pressure side or the static pressure side of the propeller vane.

Therefore, by forming a plurality of guide vanes on the surface of the propeller blade, generation of the hub vortex can be effectively suppressed.

Further, the ship of the present invention is characterized by including a propulsion device of the ship.

Therefore, when the water flow flowing on the negative pressure surface of the propeller blade and the water flow flowing on the static pressure surface join at the rear edge of the propeller blade, the direction of each water flow is approximated to suppress the occurrence of vortexes, can do.

According to the propulsion device and the ship of the present invention, since the guide vanes are formed along the rotating direction of the propeller so as to protrude from the surface of the propeller blade, generation of the hub vortex can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a stern on which a propulsion device for a ship of the first embodiment is mounted; Fig.
2 is a front view showing a propulsion unit of the ship of the first embodiment.
3 is a side view showing the propulsion device of the ship;
4 is a schematic view showing a flow of water on the negative pressure side of a general propeller blade.
5 is a schematic view showing a flow of water on the static pressure side of a general propeller blade.
6 is a schematic view showing the water flow on the negative pressure surface side of the propeller blade of the first embodiment;
7 is a cross-sectional view taken along line VII-VII of FIG.
8 is a schematic view showing the water flow on the negative pressure surface side of the propeller blade in the propulsion unit of the ship of the second embodiment;
9 is a schematic view showing a static pressure surface of the propeller blade in the propulsion apparatus of the ship of the third embodiment;
10 is a sectional view taken along line XX of Fig.
11 is a schematic view showing the water flow on the negative pressure surface side of the propeller blade in the propulsion unit of the ship of the fourth embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of a propulsion device and a ship according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to the embodiments, and when a plurality of embodiments are provided, the embodiments may be combined.

[First Embodiment]

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a stern on which a propulsion device of a ship of the first embodiment is mounted; Fig.

As shown in Fig. 1, the ship 11 has a propulsion device 14 mounted on the stern 13 of the ship 12 as one axis. The propulsion device 14 includes a propeller 21, a propeller shaft 22, and a key 23.

The propeller 21 is connected to a power source (not shown) mounted on the hull 12 via a propeller shaft 22. The power source is, for example, an internal combustion engine such as a diesel engine or an electric motor. In the ship 12, a boss 31 is formed on the stern 13. The propeller 21 is formed of a steel plate and is composed of a boss 32 and a plurality of (four in this embodiment) propeller blades 33. The boss 32 is formed in a cylindrical shape, and a plurality of propeller blades 33 are fixed at equal intervals in the circumferential direction. The end of the propeller shaft 22 is connected to the boss 32 and is supported so as to freely rotate on the boss 31 via the propeller shaft 22. [ Therefore, when the propeller shaft 22 is rotated by the power source, the propeller 21 composed of the boss 32 and the respective propeller blades 33 rotates, so that the ship 11 can be propelled by the propulsion force.

The key 23 is formed of a steel plate and disposed behind the propeller 21 (on the stern 13 side) of the ship 12. The key 23 is provided with a rudder horn 34 and a key body 35. The rudder horn 34 is formed in a columnar shape and is arranged along the vertical direction and the upper end portion is fixed to the stern 13 of the hull 12. [ The key body 35 is supported so as to freely rotate on the rudder horn 34 by a key shaft (not shown) along the vertical direction. The key 23 is provided with a driving device not shown. Therefore, the propelling direction of the ship 11 can be changed by rotating the key body 35 by the drive device.

The propelling device 14 of the ship described above is constituted by a boss 32 and a plurality of propeller blades 33 so that during the rotation, the boss 32, which is the root of each propeller blade 33, It is known that a hub swirling occurs from the outer peripheral portion of the hub 32.

Fig. 4 is a schematic view showing a flow of water on the negative pressure side of a general propeller blade, and Fig. 5 is a schematic diagram showing a flow of water on a static pressure side of a general propeller blade.

4, when the propeller blade 33 rotates in the direction A (hereinafter, referred to as the rotational direction A) with the center O as a fulcrum, the negative pressure surface 33a of the propeller blade 33 (Hereinafter referred to as a water flow direction B) toward the direction B opposite to the direction of rotation A. [ At this time, on the negative pressure surface 33a of the propeller blade 33, the water flowing in the water flow direction B with respect to the climbing arc line Ca from the center O (dot chain line) Flows along the wire (solid line) Fa. On the negative pressure surface 33a of the propeller blade 33, the limiting wire Fa on the blade surface extends from the center O side toward the tip of the propeller blade 33 toward the water flow direction B, It crosses the line Ca.

On the other hand, as shown in Fig. 5, when the propeller blade 33 rotates in the direction A (hereinafter referred to as the rotational direction A) with the center O as a point, the constant pressure surface 33b of the propeller blade 33, (Hereinafter referred to as a water flow direction B) toward the direction B opposite to the direction of rotation A as shown in Fig. At this time, on the static pressure surface 33b of the propeller blade 33, the water flowing in the water flow direction B with respect to the climbing arc line Cb from the center O, Flows along the wire (solid line) Fb. On the static pressure surface 33b of the propeller blade 33, the limiting wire Fb on the blade surface is directed toward the water flow direction B from the tip end side of the propeller blade 33 toward the center O side, And crosses the line Cb.

4 and 5, at the rear edge 33d of the propeller blade 33, the water surface 33a of the propeller blade 33 is pressed against the water stream flowing along the limiting stream Fa on the blade surface, And the water flow flowing along the limiting wire line Fb on the wing surface on the static pressure surface 33b of the propeller blade 33 join each other. At this time, since the directions of the respective water streams are different from each other, vortices are generated in the merging portion, and a plurality of vortices move toward the outer peripheral surface of the boss 32 and join together.

Fig. 2 is a front view showing the propulsion device of the ship of the first embodiment, and Fig. 3 is a side view showing the propulsion device of the ship.

2 and 3, the plurality of propeller blades 33 are formed so as to project from the surface at the rotation center (center O) side in the radial direction of the propeller 21 in this embodiment, A guide vane 41 is formed along the rotational direction A of the propeller 21. [

The guide vane 41 is formed on the side of the negative pressure surface 33a of the propeller blade 33. The guide vane 41 is provided on the side of the rear edge 33d of the propeller blade 33 in the rotational direction A and on the side of the radius of 1/10 of the propeller 21 from the outer circumferential surface of the boss 32 Area.

That is, when the chord length (the length in the rotation direction A) of the propeller blade 33 is C, the guide vane 41 is located at the front end (front end in the rotational direction A of the propeller blade 33) 41a are formed on the rear side of the propeller blade 33 in the rotational direction A of the propeller blade 33 from 1/2 c (0.5C) from the front edge 33c of the propeller blade 33. The position of the rear end (rear end in the rotational direction A of the propeller blade 33) 41b of the guide vane 41 is smaller than the position of the propeller blade 33 than the rear side edge 33d of the propeller blade 33, As shown in Fig.

When the radius from the center O to the tip of the propeller blade 33 is R and the radius from the outer circumferential surface of the boss 32 to the center position in the thickness direction of the guide vane 41 is R1, The vane 41 is formed in a region where 1/10 R? R1 (0.1R? R1).

Hereinafter, the shape and forming position of the guide vane 41 will be described in detail. 6 is a schematic view showing the water flow on the negative pressure surface side of the propeller blade of the first embodiment, and Fig. 7 is a sectional view taken along the line VII-VII in Fig.

6 and 7, the guide vane 41 is arranged on the negative pressure surface 33a so as to face the limit wire line Fa on the blade surface of the propeller blade 33. As shown in Fig. That is, the guide vane 41 does not depend on the limit line Fa on the wing surface of the propeller blade 33 on the negative pressure surface 33a, but the water flow along the limit line Fa on the wing surface collides So that the flow direction is shifted toward the center O side. In this case, it is preferable that the angle formed by the guide surface 41c on the center O side and the limit wire Fa on the blade surface is set to an obtuse angle.

More specifically, the guide vane 41 formed on the side of the negative pressure surface 33a of the propeller blade 33 is disposed along the limit wire line Fb on the wing surface generated on the static pressure surface 33b of the propeller blade 33 . In this case, the guide vane 41 may be curved or planar. It is to be noted that the guide vane 41 is a plane parallel to the limit wire Fb on the wing surface when the guide surface 41c is a curved surface, (Fb). The tangent line in this case is at the rear end 41b of the guide vane 41. [

The guide vane 41 formed on the side of the negative pressure surface 33a of the propeller blade 33 is arranged along the limiting wire Fb on the wing surface generated on the static pressure surface 33b of the propeller blade 33 You do not have to. (Rear end 41b) with the rear edge 33d of the propeller blade 33 in the rotational direction A in the extension line along the guide vane 41 formed on the negative pressure surface 33a side, , The angle formed by the tangent of the extension line along the guide vane 41 at this intersection point and the tangent line of the limit wire Fb on the wing surface on the static pressure surface 33b side at the intersection point is in the range of 0 to 5 degrees . That is, the guide vane 41 formed on the side of the negative pressure surface 33a of the propeller blade 33 is formed so that the guide surface 41c is formed on the wing surface generated on the static pressure surface 33b of the propeller blade 33, Fb may be inclined up to 5 degrees to the center side of the propeller blade 33 or inclined to 5 degrees toward the tip side.

The guide vane 41 is formed in the range of 0 to 5 degrees with respect to the attachment surface orthogonal to the negative pressure surface 33a of the propeller blade 33. That is, the guide vane 41 is preferably fixed at a right angle (90 degrees) to the negative pressure surface 33a of the propeller blade 33, but it is preferable that the guide vane 41 is fixed at 85 degrees to the negative pressure surface 33a of the propeller blade 33 Or may be inclined to the center side or the tip side of the propeller blade 33 in a range of 95 degrees.

The guide vane 41 is provided so that the length L of the propeller blade 33 in the rotational direction A is equal to the length H in the direction perpendicular to the negative pressure surface 33a of the propeller blade 33, It is preferable to set it longer. That is, the guide vane 41 has an aspect ratio (length H in the direction perpendicular to the negative pressure surface 33a / length L in the rotational direction A of the propeller blade 33) of 1.0 or more.

The guide vane 41 preferably has a thickness t in the radial direction of the propeller blade 33 constant in the rotational direction A of the propeller blade 33, It may be made thicker or thinner toward the base material A as shown in Fig. It is preferable that the guide vane 41 has a length (height) H in the direction orthogonal to the negative pressure surface 33a of the propeller blade 33 is made constant in the rotational direction A of the propeller blade 33 However, it may be made long or short toward the rotational direction A of the propeller blade 33. Further, the guide vane 41 may be subjected to a process of rounding the corner portion or cutting the corner portion.

As described above, in the propulsion apparatus for a ship according to the first embodiment, the propeller shaft 22 supported to be freely rotatable on the rear portion of the ship 12 and the propeller shaft 22 connected to the end in the axial direction of the propeller shaft 22 The propeller 21 includes a boss 32 fixed to the end of the propeller shaft 22 and a plurality of propeller blades 30 fixed to the outer circumferential portion of the boss 32 at predetermined intervals in the circumferential direction, (A) of the propeller 21 so as to protrude from the negative pressure surface 33a of the propeller blade 33 at the rotation center O side in the radial direction of the propeller 21 And has a guide vane 41.

Therefore, by forming the guide vane 41 along the rotational direction A of the propeller 21 so as to protrude from the negative pressure surface 33a of the propeller blade 33, when the propeller 21 rotates, the propeller blade 33 Is guided in a predetermined direction by the guide vane 41 and flows along the climbing arc line Ca. Then, when the water flow flowing on the negative pressure surface 33a of the propeller blade 33 and the water flow flowing on the static pressure surface 33b join at the rear edge of the propeller blade, the direction of each water flow is approximated and the occurrence of vortexes So that generation of the hub vortex can be suppressed.

In the propulsion device for a ship according to the first embodiment, the guide vane 41 is provided on the side of the rear edge 33d of the propeller blade 33 in the rotational direction A and on the side of the propeller 21 In the region of the radius of 1/10 of the radial direction. Therefore, it is possible to appropriately guide the water flow flowing on the negative pressure surface 33a of the propeller blade 33, and it is possible to effectively suppress the occurrence of the spiral of the hub.

In the propulsion device of the ship of the first embodiment, the guide vane 41 is arranged so as to face the limit wire Fa on the wing surface on the negative pressure surface 33a of the propeller blade 33. Therefore, it is possible to effectively correct the water flow flowing on the side of the negative pressure surface 33a of the propeller blade 33. [

In the propulsion device of the ship of the first embodiment, the guide vane 41 on the side of the negative pressure surface 33a of the propeller blade 33 is connected to the limit pressure surface 33b of the propeller blade 33, (Fb). The water flow along the limit line Fa on the wing surface on the side of the negative pressure surface 33a of the propeller blade 33 is guided by the guide vane 41 to the wing surface on the side of the static pressure surface 33b of the propeller blade 33 The generation of the hub vortex can be effectively suppressed by correcting the flow according to the water flow along the limit wire Fb.

In the propulsion apparatus of the ship of the first embodiment, the point of intersection with the rear edge 33d of the propeller blade 33 in the rotation direction A on the extension line along the guide vane 41 formed on the side of the negative pressure surface 33a (The rear end 41b), the angle between the tangent of the extension line along the guide vane 41 at this intersection point and the tangent line of the limit wire Fb on the wing surface on the static pressure surface 33b side at the intersection is , And is set in the range of 0 degrees to 5 degrees. Therefore, by providing a margin for the attachment angle of the guide vane 41, the effect of suppressing the occurrence of the hub vortex can be sufficiently secured, and the preparation can be improved.

In the propulsion device of the ship of the first embodiment, the guide vane 41 is formed in the range of 0 to 5 degrees with respect to the attachment surface orthogonal to the negative pressure surface 33a of the propeller blade 33. Therefore, by providing a margin for the attachment angle of the guide vane 41, the effect of suppressing the occurrence of the hub vortex can be sufficiently secured, and the preparation can be improved.

The length L of the propeller blade 33 in the guide vane 41 in the rotational direction A is set to be smaller than the length L of the propeller blade 33 in the direction perpendicular to the negative pressure surface 33a of the propeller blade 33 Is set longer than the length (H) of the direction. Therefore, the guide vane 41 can be set to the optimum shape according to the shape of the propeller blade 33.

Further, in the ship of the first embodiment, since the propulsion device 14 is formed on the ship 12, generation of the hub swirls can be suppressed.

[Second Embodiment]

8 is a schematic view showing the water flow on the side of the static pressure side of the propeller blade in the propulsion unit of the ship according to the second embodiment. Members having the same functions as those of the above-described embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In the second embodiment, as shown in Fig. 8, in the propeller blade 33, the propeller 21 (see Fig. 2) is designed to protrude from the surface at the rotation center (center O) side in the radial direction And a guide vane 51 is formed along the rotational direction A of the propeller 21. [

The guide vane 51 is formed on the side of the static pressure surface 33b of the propeller blade 33. The guide vane 51 is provided on the side of the rear edge 33d of the propeller blade 33 in the rotational direction A and on the side of the radius of 1/10 of the propeller 21 from the outer circumferential surface of the boss 32 Area.

That is, when the chord length (the length in the rotational direction A) of the propeller blade 33 is C, the guide vane 51 is located at the front end (front end in the rotational direction A of the propeller blade 33) 51a are formed on the rear side of the propeller blade 33 in the rotational direction A of the propeller blade 33 from 1/2 c (0.5 C) from the front edge 33c of the propeller blade 33. The position of the rear end (the rear end in the rotational direction A of the propeller blade 33) of the guide vane 51 is smaller than the position of the propeller blade 33 than the rear side edge 33d of the propeller blade 33, As shown in Fig.

When the radius from the center O to the tip of the propeller blade 33 is R and the radius from the outer peripheral surface of the boss 32 to the center position in the thickness direction of the guide vane 51 is R1, The vane 51 is formed in an area where 1/10 R? R1 (0.1R? R1).

Specifically, the guide vane 51 is arranged on the static pressure surface 33b so as to oppose the limit wire line Fb on the blade surface of the propeller blade 33. As shown in Fig. That is, the guide vane 51 does not follow the limit wire line Fb on the wing surface of the propeller blade 33 on the static pressure surface 33b, but flows along the limit wire line Fb on the wing surface, So that the flow direction thereof is shifted toward the tip end side of the propeller blade 33. As shown in Fig. In this case, it is preferable that the angle formed by the guide surface 51c on the tip end side of the propeller blade 33 and the limit wire line Fb on the blade surface is set to an obtuse angle.

Specifically, the guide vane 51 formed on the side of the static pressure surface 33b of the propeller blade 33 is disposed along the limiting wire Fa on the wing surface generated on the negative pressure surface 33a of the propeller blade 33 . In this case, the guide vane 51 may be curved or planar. It is to be noted that the guide vane 51 is a plane parallel to the limit wire Fa on the wing surface when the guide surface 51C is curved, And the surface parallel to the tangent line Fa. The tangent line in this case is at the rear end 51b of the guide vane 51. [

The guide vane 51 formed on the side of the negative pressure surface 33a of the propeller blade 33 is arranged along the limit wire Fa on the wing surface generated on the negative pressure surface 33a of the propeller blade 33 You do not have to. (Rear end 51b) of the propeller blade 33 with the rear edge 33d of the propeller blade 33 in the rotational direction A, for example, on the extension line along the guide vane 51 formed on the side of the static pressure surface 33b , The angle between the tangent of the extension line along the guide vane 51 at this intersection point and the tangent line of the limit line Fa on the side of the negative pressure surface 33a at the intersection point is in the range of 0 to 5 degrees . That is to say, the guide vane 51 formed on the side of the static pressure surface 33b of the propeller blade 33 is formed so that the guide surface 51c is formed on the wing surface on the negative pressure surface 33a of the propeller blade 33 Fb may be inclined up to 5 degrees to the center side of the propeller blade 33 or inclined to 5 degrees toward the tip side.

The angle of attachment of the guide vane 51 to the static pressure surface 33b of the propeller blade 33, the length L of the rotation direction A of the propeller blade 33, (Height) H in the direction perpendicular to the longitudinal direction of the propeller blade 33a, the thickness t in the radial direction of the propeller blade 33, and the shape may be changed as in the first embodiment described above.

As described above, in the propulsion apparatus for a ship according to the second embodiment, the propeller shaft 22 supported to be freely rotatable on the rear portion of the ship 12 and the propeller shaft 22 connected to the end in the axial direction of the propeller shaft 22 The propeller 21 includes a boss 32 fixed to the end of the propeller shaft 22 and a plurality of propeller blades 30 fixed to the outer circumferential portion of the boss 32 at predetermined intervals in the circumferential direction, (A) of the propeller 21 so as to protrude from the static pressure surface 33b of the propeller blade 33 at the rotational center O side in the radial direction of the propeller 21 And has a guide vane 51.

Therefore, by forming the guide vane 51 along the rotational direction A of the propeller 21 so as to protrude from the static pressure surface 33b of the propeller blade 33, when the propeller 21 rotates, the propeller blade 33 Is guided in a predetermined direction by the guide vane 51 and flows along the climbing arc source line Cb. When the water flow flowing on the negative pressure surface 33a of the propeller blade 33 and the water flow flowing on the static pressure surface 33b join at the rear edge 33d of the propeller blade 33, The occurrence of vortexes is suppressed, and generation of the vortex of the hub can be suppressed.

[Third embodiment]

Fig. 9 is a schematic view showing a negative pressure surface of the propeller blade in the propulsion unit of the ship according to the third embodiment, and Fig. 10 is a sectional view taken along the line X-X in Fig. Members having the same functions as those of the above-described embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In the third embodiment, as shown in Figs. 9 and 10, in the propeller blade 33, at the rotation center (center O) side in the radial direction of the propeller 21 (see Fig. 2) Guide vanes 41 and 51 are formed along the rotational direction A of the propeller so as to protrude from the guide vanes 41 and 51, respectively.

The guide vane 41 is formed on the side of the negative pressure surface 33a of the propeller blade 33. The guide vane 41 is provided on the side of the rear edge 33d of the propeller blade 33 in the rotational direction A and on the side of the radius of 1/10 of the propeller 21 from the outer circumferential surface of the boss 32 Area. The guide vane 51 is formed on the side of the static pressure surface 33b of the propeller blade 33. The guide vane 51 is provided on the side of the rear edge 33d of the propeller blade 33 in the rotational direction A and on the side of the radius of 1/10 of the propeller 21 from the outer circumferential surface of the boss 32 Area.

The guide vane 41 formed on the side of the negative pressure surface 33a of the propeller blade 33 and the guide vane 51 formed on the side of the static pressure surface 33b of the propeller blade 33 are arranged in the thickness direction of the propeller blade 33 As shown in Fig. Concretely, the guide vane 41 and the guide vane 51 are arranged such that the position of the rear edge 33d is the same position in the radial direction of the propeller blade 33 and the length of the rotational direction A is the copper length . However, the guide vane 41 and the guide vane 51 may be formed at different positions that do not face each other, or may be formed in different shapes.

As described above, in the propulsion apparatus of the ship of the third embodiment, the propeller 21 is provided so as to protrude from the negative pressure surface 33a of the propeller blade 33 at the rotation center O side in the radial direction of the propeller 21 A guide vane 41 formed along the rotational direction A and a propeller 21 so as to protrude from the static pressure surface 33b of the propeller blade 33 at the rotational center O side in the radial direction of the propeller 21 The guide vane 51 is formed along the rotation direction A of the guide vane.

Therefore, the water flow flowing on the negative pressure surface 33a of the propeller blade 33 and the water flow flowing on the static pressure surface 33b are corrected by the guide vanes 41, 51 so that the direction of each water flow is approximated, Generation of the hub vortex can be suppressed.

[Fourth Embodiment]

11 is a schematic view showing the water flow on the negative pressure surface side of the propeller blade in the propulsion device of the ship of the fourth embodiment. Members having the same functions as those of the above-described embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In the fourth embodiment, as shown in Fig. 11, in the propeller blade 33, the propeller 21 (see Fig. 2) is provided so as to protrude from the surface at the rotation center (center O) side in the radial direction Guide vanes 41 and 42 are formed along the rotational direction A of the propeller 21. [

The guide vanes 41 and 42 are formed on the side of the negative pressure surface 33a of the propeller blade 33. The guide vanes 41 and 42 are provided on the side of the rear edge 33d of the propeller blade 33 in the rotational direction A and on the side of the 1/10 radius of the propeller 21 from the outer circumferential surface of the boss 32 As shown in Fig. The guide vanes 41 and 42 are formed at predetermined intervals in the radial direction of the propeller blade 33.

In the present embodiment, two guide vanes 41, 42 may be formed on the side of the negative pressure surface 33a of the propeller blade 33, or three or more guide vanes 41, 42 may be formed. Further, the two guide vanes 41 and 42 may be formed at different positions, or may be formed in different shapes. Further, one or a plurality of guide vanes may be formed on the side of the static pressure surface 33b of the propeller blade 33.

The guide vanes 41 and 42 are provided on the side of the negative pressure surface 33a or the side of the static pressure surface 33b of the propeller blade 33 in the radial direction of the propeller 21 in the ship propulsion system of the fourth embodiment Are formed at a predetermined interval. Therefore, occurrence of the hub vortex can be effectively suppressed.

11: Ship
12: Hull
13: Stern
14: Propulsion device
21: Propeller
22: Propeller shaft
23: Key
31: Bosch
32: Boss
33: Propeller blade
33a: negative pressure side
33b: constant pressure face
33c: front edge
33d: rear edge
41, 42, 51: guide vane
41a, 51a: Shear
41b, 51b: rear end
Ca, Cb: Climbing circle
Fa, Fb: Limit wire on wing surface

Claims (10)

A propeller shaft supported so as to freely rotate on a rear portion of the hull,
And a propeller connected to an end portion in an axial direction of the propeller shaft,
Wherein the propeller comprises:
A boss fixed to an end of the propeller shaft,
A plurality of propeller blades fixed to the outer periphery of the boss at predetermined intervals in the circumferential direction,
And a guide vane formed along the rotational direction of the propeller so as to protrude from a surface of the propeller blade at a rotational center side in the radial direction of the propeller. The method according to claim 1,
Wherein the guide vane is disposed in a region from a rear edge side of the propeller blade in a rotating direction and from a circumferential surface of the boss to a position of a 1/10 radius of the propeller. The method according to claim 1,
Wherein the guide vane is formed on at least one of a negative pressure side and a static pressure side of the propeller blade. The method according to claim 1,
Wherein the guide vane is disposed so as to face the limit stream on the wing surface of the propeller blade. 5. The method of claim 4,
Wherein the guide vanes of either one of the negative pressure side and the static pressure side of the propeller blade are disposed along a limiting stream line on a wing surface generated on either the negative pressure side or the static pressure side of the propeller blade. . 6. The method of claim 5,
And a tangential line of an extension line along the guide vane at the intersection with the rear edge in the rotational direction of the propeller blade at an extension line along the guide vane formed on either the negative pressure side or the static pressure side, , And an angle formed by a tangent line of the limiting wire on the other of the negative pressure surface side and the static pressure surface side of the intersection is set in the range of 0 to 5 degrees. The method according to claim 1,
Wherein the guide vane is formed in a range of 0 to 5 degrees with respect to an attachment surface orthogonal to the surface of the propeller blade. The method according to claim 1,
Wherein the guide vane is set longer than the length of the propeller blade in the direction of rotation of the propeller blade in a direction perpendicular to the surface of the propeller blade. The method according to claim 1,
Wherein a plurality of the guide vanes are formed at predetermined intervals in the radial direction of the propeller on the negative pressure side or the static pressure side of the propeller vane. A ship characterized by comprising a propulsion device for a ship as set forth in any one of claims 1 to 9.

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