JPH11278380A - Propulsion device for ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reduction in an effective area of a propeller blade due to a boss part, to which the propeller blade is mounted, and to prevent deterioration in propulsion efficiency. SOLUTION: In a hull stem part 2a, a ring type nozzle member 11 provided with an internal space part 11b is installed, and a ring type rotor 14, which can be freely rotated along the outer circumference of the internal space part 11b of the nozzle member 11, is arranged. On the inner circumferential face of the rotor 14, four propeller blades 15 are radially installed at angular intervals of 90 degrees toward the rotation center of the rotor 14, while the tip parts of the propeller blades 15 are connected together. In addition, a rotation driving machine rotating the rotor 14 via a ring shaped gear 16 formed on its outer circumference and a driving gear 19 is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion device for a ship.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a propulsion device provided on a ship includes a boss 10 at a tip end of a propeller shaft 102 rotatably projecting from a bottom bulging portion 101 of the hull.
3, a plurality of propeller blades 104 were radially mounted.

[0003]

According to the conventional propulsion device described above, the ratio of the outer diameter of the boss 103 to the outer diameter of the propeller blade 104 is as large as 30%. However, there is a problem in that the ratio of the deployment area decreases, and the propulsion efficiency decreases due to the decrease in the lift, and a vortex is generated from the boss 103, which further reduces the propulsion efficiency.

Accordingly, an object of the present invention is to provide a propulsion device for a marine vessel which can prevent a decrease in the effective area of a propeller blade due to a boss portion to which the propeller blade is attached and also prevent a reduction in propulsion efficiency.

[0005]

In order to solve the above-mentioned problems, a propulsion device for a marine vessel according to the present invention comprises:
While attaching the nozzle member,
An annular rotatable rotating body is provided along the outer circumference of the inner space portion, and a plurality of propeller blades are radially mounted on the inner circumferential surface of the rotating body at predetermined intervals toward the center of rotation. A rotary drive device is provided for connecting the tips of the propeller blades to each other and rotating the rotating body.

According to the above configuration, since a plurality of propeller blades are provided on the inner peripheral surface of the annular rotating member rotatably provided on the nozzle member, compared with the case where the propeller blades are provided via the boss portion. As a result, the blade area can be widened at a position where the peripheral speed is high, so that the propulsion efficiency is improved. Also, since the tips of the propeller blades were connected to each other,
The strength of the propeller wing is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A propulsion device for a ship according to an embodiment of the present invention will be described below with reference to FIGS.

The propulsion device according to the present invention is not a boss,
The propeller blades are rotated by a rotary member rotatably provided on the nozzle member. That is, as shown in FIGS. 1 to 5, the propulsion device 1 has a predetermined length (length in the front-rear direction) provided hanging from the lower surface of the stern portion 2 a of the hull 2 and has a circular front view. A nozzle member 11 having a shape (annular shape) and an annular space chamber 12 formed in the nozzle member 11 are rotatably arranged via a plurality of (for example, six at every 60 degrees) bearing members 13. From the position of the annular rotating body 14 and the inner peripheral surface of the rotating body 14 and at a predetermined angle, for example, 90 degrees, the rotation axis thereof (corresponding to the propeller axis in the case of a normal ship). a (not limited to four, but may be two to three, or five or more) propeller blades 15 protruding toward the a
And a rotation drive device 17 for rotating the same via a ring gear 16 formed on the outer peripheral surface thereof. Of course, a propeller blade 15 is provided on the inner peripheral surface of the nozzle member 11.
A groove 11a through which the root portion of the nozzle member 11 can be inserted is formed, and the propeller blades 15 are located in an inner space 11b formed inside the nozzle member 11. In the rear edge portion of the nozzle member 11, if necessary, rectifying fins 1 are provided.
8 is attached. Note that FIG. 1 shows a schematic cross section of the stern portion 2a and the nozzle member 11,
In FIG. 2, the fins 18 are not shown.

The rotary drive unit 17 is rotatably disposed in the stern 2a and is engaged with the ring gear 16 and the drive gear 19 is disposed at a predetermined position in the hull 2 so as to connect the drive gear 19 to the stern 2a. A rotary drive (not shown, for example, an electric motor or an internal combustion engine is used).

As shown in FIGS. 1 and 5, the bearing member 13 includes a pair of thrust bearings 21 inside the nozzle member 11.
The rotary shaft 22 is rotatably supported via the rotary shaft 22, and is attached to both ends of the rotary shaft 22 and abuts on the inclined portions 14a formed on both side surfaces of the rotary body 14 to act on the ring gear 16. And a pair of frusto-conical supporting rollers 23 for mainly receiving a thrust force. Of course, the radial force is also supported by the thrust bearing 21.

As shown in FIG. 6, the cross-sectional shape of the nozzle member 11 is formed in a wing shape. With such a wing shape, a thrust force T, which is a force in the bow direction, is obtained.
Occurs. In FIG. 6, assuming that the lift generated by the water flow W is L and the drag is D, of these resultant forces N, a forward component T acts as a thrust force. That is, in addition to the propulsion force of the propeller blade 15, the thrust force generated by making the nozzle member 11 into a blade shape is added,
Therefore, the propulsion efficiency of the ship is improved.

As shown in FIG. 2, each of the propeller blades 15 has a parabolic shape (or a semi-elliptical shape) and a cross-sectional shape of an airfoil, so that propulsive force can be efficiently generated. It has been like that.

The inner peripheral portion of the nozzle member 11 and the rotating body 14
A seal member 31 is provided between the nozzle member 11 and the side surface of the nozzle member 11 to prevent seawater from entering the annular space chamber 12 of the nozzle member 11. The sealing member 31 is a ring-shaped sealing member 34 inserted into an annular groove 33 formed in an annular plate 32 provided along the wall 11 c in the annular space 12.
And a plurality of spring members 35 which are inserted into the annular groove 33 and at a plurality of positions to press the ring-shaped seal member 34 toward the rotating body 14.

In the above configuration, when the ship is propelled, the rotary drive rotates the ring gear 16 via the drive gear 19, so that the four propeller blades 15 attached to the rotating body 14 rotate. Propulsion is generated.

As described above, the propulsion device 1 is mounted on the inner peripheral surface of the rotating body 14 rotatably provided on the nozzle member 11.
Since the four propeller blades 15 are protruded toward the center thereof, there is no need to provide a boss as in the conventional case, so that the blade area can be widened at a position where the peripheral speed is high, and the vortex from the boss can be increased. Can be eliminated, so that the propulsion efficiency can be improved. Propeller wing 15
Is mounted on the inner peripheral surface of the rotating body 14, so that a sufficient mounting space at the root can be secured, and therefore, the strength of the propeller blade 15 can be increased.
Furthermore, since the tip portions of the propeller blades 15 are connected to each other, the strength of the propeller blades 15 can be further improved, and the manufacture thereof can be performed easily and at low cost.

In the above embodiment, the propeller blade 15 has been described as having a parabolic shape. However, the propeller blade may be, for example, a semi-elliptical propeller blade, a triangular propeller blade, or a crescent propeller blade. It may be a skew wing.

In each of the above-described propeller blades, four propeller blades are provided so as to protrude from the inner peripheral surface of the rotating body toward the center. By connecting the parts to each other, the structure of the propeller blade itself can be made simpler and stronger.

[0018]

As described above, according to the structure of the propulsion device of the present invention, the propeller blades are protruded toward the center of rotation from the inner peripheral surface of the annular rotating body rotatably provided on the nozzle member. Since the boss portion is provided, it is not necessary to provide a boss portion as in the related art. Therefore, the blade area can be increased and the vortex generated from the boss portion can be eliminated, so that the propulsion efficiency can be improved. In addition, since the propeller blade is mounted on the inner peripheral surface of the rotating body, a sufficient space for mounting the root portion can be secured, and therefore the strength of the propeller blade can be increased. Further, since the tip portions of the propeller blades are connected to each other, the strength of the propeller blades can be further improved, and the manufacture thereof can be performed easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of a propulsion device according to an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 2;

FIG. 4 is a view taken in the direction of arrows CC in FIG. 1;

FIG. 5 is a sectional view of a main part of the propulsion device.

FIG. 6 is a diagram illustrating an operation of generating thrust in a nozzle member of the propulsion device.

FIG. 7 is a sectional view of a main part of a conventional propulsion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion device 2 Hull 11 Nozzle member 11b Inner space part 12 Annular space room 13 Bearing member 14 Rotating body 15 Propeller blade 16 Ring gear 17 Rotation drive device

Claims (1)

[Claims] 1. A nozzle member is attached to a stern of a hull, and the nozzle member is provided with an annular rotating body rotatable along an outer periphery of an inner space portion thereof, and an inner circumferential surface of the rotating body is provided with an annular rotating body. A plurality of propeller blades are radially mounted at predetermined intervals toward the center of rotation, and a rotary drive device for connecting the tips of the propeller blades to each other and rotating the rotating body is provided. Propulsion devices in ships.