JP2000118491A - Propelling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance propulsion by arranging a spiral blade integrally rotating with a cylindrical outer cylinder integrally rotating with a rotary shaft with the axis of the rotary shaft as the center, on the inside of the outer cylinder. SOLUTION: An outer cylinder 2 is formed in a cylindrical shape of a straight cylinder shape having the same diameter toward the rear side from the front side so that the center line is made to coincide with the axis of a rotary shaft 1. A blade 4 is formed in a spiral belt shape so that the spiral turning inside end is fixed to the rotary shaft 1. When the rotary shaft 1 is revolvingly driven by a driving engine mounted on a ship, the outer cylinder 2, a support arm 3 and the blade 4 rotate integrally with the rotary shaft 1. The rotating blade 4 forms a water flow inside by sucking water from the front side of the outer cylinder 2. The water flow formed by the blade 4 is blown out of the rear side of the outer cylinder 2 to generate propulsion to thereby protect the blade 4 from an obstacle in the water as well as to enhance the propulsion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field related to a propulsion device that is mounted on a ship, an underwater work boat, or the like and generates a propulsion force by rotation in water.

[0002]

2. Description of the Related Art Conventionally, as a propulsion device, for example, a propulsion device in which a cylindrical non-rotating shroud is provided outside a rotation region of an axial-flow-type screw connected to a rotating shaft and rotating is known.

[0003] This conventional propulsion device is intended to protect the screw from obstacles in the water by a shroud surrounding the screw and to rectify the water flow formed by the screw to increase the propulsion.

[0004]

In the above-mentioned conventional propulsion device, a considerable effect has been obtained with respect to the protection of the screw, but a sufficient effect has not been obtained with respect to the improvement of the propulsion force. is there.

[0005] The present invention has been made in consideration of such problems, and has as its object to provide a propulsion device that has improved propulsion performance without losing a protection function against underwater obstacles.

[0006]

Means for Solving the Problems To solve the above-mentioned problems, the propulsion device according to the present invention employs the following means.

That is, in the first aspect, the rotating shaft, a cylindrical outer cylinder that rotates integrally with the rotating shaft about the axis of the rotating shaft, and an inner cylinder provided inside the outer cylinder and integrally rotating with the outer cylinder. And a spiral blade.

[0008] In this means, similarly to the above-described conventional example, the outer cylinder surrounding the blade protects the blade from obstacles in the water and rectifies the water flow formed by the blade to increase the propulsive force. Then, the water flow by the blade is increased in pressure by the spiral pressurization, and the flow resistance of the water flow by the blade is attenuated by the integral rotation of the contacting outer cylinder, so that the propulsion force becomes extremely high.

According to a second aspect of the present invention, in the propulsion device according to the first aspect, the blade comprises a plurality of pieces constituting at least a part of one spiral rotation.

In this means, a water flow is formed by a plurality of blades.

According to a third aspect of the present invention, in the propulsion device according to the first or second aspect, the blade is connected to both the rotating shaft and the outer cylinder.

In this means, the rotating shaft and the outer cylinder are connected via the blade.

According to a fourth aspect, in the propulsion device according to any one of the first to third aspects, the outer cylinder is formed in a tapered shape having a diameter decreasing from the front side toward the rear side.

In this means, the spiral pressure of the water flow by the blade is gradually increased from the front side to the rear side of the outer cylinder.

[0015]

Embodiments of a propulsion device according to the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment (1) of a propulsion device according to the present invention.

In this embodiment, as shown in FIG.
The watercraft W is provided so as to protrude into the underwater W from the rear part of the hull of the ship S.

As shown in detail in FIG. 2 and FIG. 3, this embodiment comprises each part of a rotating shaft 1, an outer cylinder 2, a support arm 3, and a blade 4.

The rotary shaft 1 is connected to a drive engine (not shown) mounted on the boat S and is driven to rotate. The rotary shaft 1 projects linearly downward and obliquely downward from the rear of the hull of the boat S toward the water W. It is arranged as follows.

The outer cylinder 2 is formed in a straight cylindrical shape having the same diameter from the front side to the rear side, and has a center line coincident with the axis of the rotating shaft 1.

The support arm 3 is formed in a frame shape in which thin rods are radially assembled, and connects the rotating shaft 1 and the outer cylinder 2.
The support arm 3 enables the rotation shaft 1 and the outer cylinder 2 to rotate integrally.

The blade 4 is formed in a spiral band shape,
The inner end of the spiral is fixed to the rotating shaft 1. Therefore, the blade 4 is provided inside the outer cylinder 2 and rotates integrally with the outer cylinder 2.

According to this embodiment, when the rotating shaft 1 is rotationally driven by the driving engine mounted on the boat S, the outer cylinder 2, the support arm 3, and the blade 4 rotate integrally with the rotating shaft 1. become. The rotated blade 4 draws water from the front side of the outer cylinder 2 and forms a water flow inside. Then, the water flow formed by the blade 4 is jetted from the rear side of the outer cylinder 2 to generate a propulsive force.

Therefore, similarly to the above-mentioned conventional example, the outer cylinder 2 surrounding the blade 4 protects the blade 4 from obstacles in the water W and straightens the water flow formed by the blade 4 to increase propulsion. Can be done.

In particular, since the blade 4 spirally pressurizes the water inside the outer cylinder 2, the water flow is increased in pressure and is ejected from the rear side of the outer cylinder 2. Further, since the water flow formed by the blade 4 and the outer cylinder 2 rotate integrally, the contact friction between the water flow and the outer cylinder 2 is reduced, and the flow resistance is reduced. For this reason, the propulsion force is extremely high as compared with the above-described conventional example.

4 and 5 show an embodiment (2) of the propulsion device according to the present invention.

In this embodiment, the outer cylinder 2 of the above-described embodiment (1) is formed in a tapered cylindrical shape whose diameter decreases from the front side to the rear side.

According to this embodiment, the passage of the water flow formed by the blade 4 gradually narrows from the front side to the rear side of the outer cylinder 2, and the water flow is gradually increased in pressure. For this reason, the energy loss of the spiral pressurization of water is reduced, and the propulsive force can be efficiently increased.

FIGS. 6 and 7 show a third embodiment of the propulsion device according to the present invention.

In this embodiment, the turning inner end of the blade 4 of the above embodiment (1) is separated from the rotating shaft 1 and the turning outer end is fixed to the inner wall of the outer cylinder 2.

According to this embodiment, the water flow swirled and pressurized by the blade 4 is concentrated around the rotation axis 1. For this reason, the turbulence of the water flow is reduced, and the propulsive force can be reliably increased.

In this embodiment, the outer cylinder 2
Can be formed in a tapered cylindrical shape. Further, a configuration in which the rotating shaft 1 is not inserted through the outer cylinder 2 may be adopted.

8 and 9 show an embodiment (4) of the propulsion device according to the present invention.

In this embodiment, the turning inner end of the blade 4 of the above-described embodiments (1) and (3) is fixed to the rotating shaft 1 and the turning outer end is fixed to the inner wall of the outer cylinder 2. I have. Further, the support arm 3 is omitted.

According to this embodiment, all the water sucked into the outer cylinder 2 can be reliably swirled and pressurized. Therefore, the driving force can be more reliably increased. In addition, since the resistance of the water flow where the support arm 3 is omitted is reduced, the driving force is further increased. In addition, since the blade 3 is interposed between the rotary shaft 1 and the outer cylinder 2, the assembling strength of the rotary shaft 1, the outer cylinder 2, and the blade 3 is enhanced.

It should be noted that also in this embodiment, the outer cylinder 2
Can be formed in a tapered cylindrical shape.

As described above, in addition to the illustrated embodiment, the helical pitch of the blades 4 may be partially changed, or the blades 4 for assisting the formation of the water flow may be added. In particular, when the outer cylinder 2 is formed in a tapered shape,
By adjusting the helical pitch of the blade 4, the swirling pressure of the water can be adjusted.

Further, the spiral of the blade 4 may be made only one rotation or less than one rotation. Also, blade 4
May be a plurality of pieces. According to this embodiment, the shaft lengths of the rotating shaft 1 and the outer cylinder 2 are shortened, so that the overall size can be reduced.

[0039]

As described above, in the propulsion device according to the present invention, the outer cylinder surrounding the blade protects the blade from obstacles in the water and increases the thrust by rectifying the water flow formed by the blade. And has the effect of not impairing the conventional effect.

Further, since the water flow by the blade is increased in pressure by helical pressurization and the flow resistance of the water flow by the blade is attenuated by the integral rotation of the contacting outer cylinder, there is an effect that the propulsion force becomes extremely high.

Furthermore, the second aspect of the present invention is capable of shortening the axial lengths of the rotary shaft and the outer cylinder, which has the effect of reducing the overall size.

Further, since the water sucked into the outer cylinder can be reliably swirled and pressurized, the thrust can be more reliably increased.

Further, a third aspect of the present invention has an effect that the blade is interposed entirely between the rotary shaft and the outer cylinder, and the assembling strength of the rotary shaft, the outer cylinder and the blade is enhanced.

Further, the water flow path formed by the blades is gradually narrowed from the front side to the rear side of the outer cylinder, and the water flow is gradually increased in pressure. There is an effect that the energy loss of pressurization is reduced and the propulsive force can be efficiently increased.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment (1) of a propulsion device according to the present invention, showing a state of being mounted on a ship.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a sectional view showing an embodiment (2) of a propulsion device according to the present invention.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a sectional view showing an embodiment (3) of a propulsion device according to the present invention.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a sectional view showing an embodiment (4) of a propulsion device according to the present invention.

FIG. 9 is a side view of FIG.

[Explanation of symbols]

 1 rotating shaft 2 outer cylinder 4 blade

Claims (4)

[Claims] 1. A rotating shaft, a cylindrical outer cylinder that rotates integrally with the rotating shaft about an axis of the rotating shaft, and a helical blade provided inside the outer cylinder and rotating integrally with the outer cylinder. A propulsion device consisting of 2. The propulsion device according to claim 1, wherein the blade comprises a plurality of pieces constituting at least a part of one spiral rotation. 3. The propulsion device according to claim 1, wherein
A propulsion device wherein the blade is connected to both the rotating shaft and the outer cylinder. 4. The propulsion device according to claim 1, wherein the outer cylinder is formed in a tapered shape whose diameter decreases from a front side to a rear side.