JPH08258791A - Propeller device with stator for ship - Google Patents

Abstract

PURPOSE: To provide a propeller device with a stator for a ship which is so constituted as to improve a propulsion force, simplify structure wherein a safe and rapid work to demount and mount a propeller is effected in such a manner to save a labor, reduce a cost, and improve performance and economical efficiency. CONSTITUTION: The rear end of the boss 5 of a stator blade 4 from which a plurality of blades with an equal length coaxially arranged right after a screw propeller 2 and radially protruded is fitted in a hole 7 formed in the axial direction of a propeller shaft in the front end of the lower end part of a rudder horn 6. A gap being longer than the length of the boss of the propeller 2 is provided between the front end of the stator blade 4 and the rear end of the propeller 2. Further, the length in a radial direction of the stator blade 4 is shorter than the radius of the propeller 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller device with a stator of a ship.

[0002]

2. Description of the Related Art In a stern part of a ship equipped with an ordinary propeller, as shown in the side view of FIG.
2 is main engine, 03 is propeller shaft, 04 is propeller, 05 is propeller boss, 06 is propeller blade, 07 is rudder, 08
Indicates the wake of the propeller. Here, the torque of the main engine 02 is transmitted to the propeller 04 via the propeller shaft 03,
The propeller 04 rotates and accelerates the surrounding fluid backward, thereby generating a thrust Tp as a reaction thereof.

[0003]

However, at this time, the propeller not only generates thrust Tp by accelerating the surrounding fluid backward, but also generates a rotational flow in the same direction as the rotation of the propeller 8 after the propeller. Occurs inside. This rotational flow does not contribute to the increase of the thrust Tp, and its rotational energy is wastefully discarded in the propeller wake. Therefore, the propelling efficiency of the propeller is reduced by the amount of the rotational energy flowing in the wake. In addition, it is necessary for an ordinary ship to dock in the dock once every two to three years to remove dirt adhering to the hull and propeller.
At that time, it is necessary to remove the propeller from the propeller shaft, but in conventional vessels there is no gap behind the propeller, so the propeller shaft must be pulled forward to remove the propeller, which requires a lot of man-hours. Has become. By the way, the invention of the stator described in Japanese Patent Application Laid-Open No. 4-282499 "Fined Rudder" is disclosed as a means for reducing the decrease in the propeller propelling efficiency and increasing the propulsive force. . According to this stator, as shown in a side view of FIG. 7 and a partial perspective view thereof, a horizontal short shaft 010 that projects forward to a lower end front surface portion of a ladder horn 09 that pivotally supports a ladder 07 around a vertical axis. Is provided, the center hole of the boss 012 of the stator blade (also referred to as a stator fin) 011 which radially projects to the short shaft 010 is externally fitted, and the boss 012 is fixed to the short shaft 010 by the horizontal pin. This type of stator has its fins twisted outwardly to increase the angle of twist and twisted to generate swirl flow in the opposite direction to eliminate the swirl of the wake caused by the propeller. Is given. However, the technical purpose itself of the stator disclosed in this publication is not to improve propulsion efficiency, but to facilitate repair work when a stator fin of this type is damaged, the stator is attached to the lower end of the ladder horn. It is to be detachably fixed to the front end face of the part. The applicant of the present application mentions the existence of the above-mentioned publication relating to such a stator, as will be described later, although the structure of this type of stator happens to be similar to the structure of the present invention. This is because it is pointed out that the invention has a structure different from that of the invention and is also different from the invention of the present application in terms of its function and effect, as will be described later.

The present invention has been proposed in view of the above circumstances, and aims to improve the propulsion force and to remove and install the propellers safely, quickly, labor-saving, and labor-saving. The structure is simple, the cost is low, and the cost is high. An object of the present invention is to provide a propeller device with a stator for a marine vessel that is economical in performance.

[0005]

In order to achieve such an object, the invention according to claim 1 is arranged substantially coaxially immediately after the screw propeller, and a plurality of blades of substantially equal length are radially provided in a projecting manner. The rear end of the boss of the stator blade is fitted into a hole in the propeller shaft direction formed at the front end of the lower end of the ladder horn.

According to a second aspect of the present invention, in the first aspect, an axial gap longer than the boss length of the propeller is provided between the front end of the stator blade and the rear end of the propeller. .

The invention of claim 3 is characterized in that, in claim 1, the radial length of the stator blade is made shorter than the radius of the propeller.

The invention of claim 4 is characterized in that both claim 1 and claim 2 are combined.

The invention of claim 5 is characterized in that both claim 1 and claim 3 are combined.

The invention of claim 6 is characterized in that it has both claim 1, claim 2, and claim 3.

[0011]

According to such a configuration, the following operation is performed. (1) The rotating flow in the wake generated by the propeller is converted into a linear flow by the stator, and at that time, the energy of the rotating flow is most efficiently converted into thrust to increase the propulsive force of the hull. (2) The boss portion of the stator fin and the rudder horn are separately manufactured, and the prismatic or columnar protruding boss protruding rearward from the stator boss is detachably fitted into the concave hole of the lower end front surface of the rudder horn with a horizontal pin. The stator fins do not rotate as they do. Further, the stator can be easily attached and detached on site. (3) When it is necessary to remove the propeller during docking, the propeller and stator can be removed from the hull without removing the propeller shaft.

[0012]

1 is a side view showing a first embodiment of the present invention, FIG. 2 is a front view of the stator shown in FIG. 1 taken along the line II--II, and FIG. FIG. 4 is a side view showing a ladder horn portion of a second embodiment, FIG. 4 is a side view of a stern portion showing a third embodiment of the present invention, and FIG. 5 is a front view taken along the line VV of FIG.

First, in the first embodiment shown in FIGS. 1 and 2, in the first embodiment shown in FIGS. 1 and 2, a hole 7 having a short columnar shape or a short prismatic shape in the front-rear direction is formed in the front end face of the lower end of the ladder horn 6. A short columnar or short prismatic rear end boss 5a protruding from the rear end of the boss 5 of the stator fin 4 is inserted therein, and this is fixed to the hole 7 of the ladder horn 6 by means of a horizontal pin 9 so that the rear boss 5a can be inserted and removed. To do. Here, the outer diameter Dp of the propeller 2 is the stator fin 4
Of the propeller boss 2a, which is larger than the outer diameter Ds of
p is smaller than the axial clearance Ls between the rear end of the propeller boss 2a and the front end of the boss 5 of the stator fin 4.

Next, in the second embodiment shown in FIG.
A protrusion 8 is provided at the lower end of the front end of the ladder horn 6, and a cylindrical or prismatic hole 7 is bored in the protrusion 8, and the rear end boss 5 of the stator boss 5 is formed in the same manner as in the first embodiment. 5a is fitted.

Further, in the third embodiment shown in FIGS. 4 to 5, the stator fin 4 is prevented from rotating via the rear end boss 5a between the propeller 2 and the rudder horn 6 of the rudder behind the propeller 2. Is attached to the rudder horn 6.
Here, the tip end of the stator fin 4 is smaller than the radius of the propeller 2 so that it does not project outside the wake of the propeller 2. An axial gap Ls larger than the axial length Lp of the propeller boss 2a is provided between the propeller 2 and the stator fin behind the propeller 2.

[0016]

According to such an embodiment, in any structure, a relatively small diameter stator fin is concentrically installed behind a relatively large diameter propeller.
The swirling flow in the wake of the propeller can be changed to a linear flow, and at that time, the rotational flow energy can be efficiently converted into thrust to increase the propulsion force, and at the same time, the weight can be reduced by concentrically reducing the stator fin diameter. Therefore, it is possible to obtain the water resistance reduction effect and the cost reduction effect. Further, since the axial gap Ls longer than the propeller boss length Lp is formed between the propeller and the stator fin, when the propeller or the stator fin needs to be removed at the time of docking, the propeller shaft is pulled out forward. By removing the stator fins while leaving the propeller shaft in place, it is possible to move the propeller slightly rearward, remove it, and attach it again, without any troublesome work.

Here, Japanese Patent Laid-Open No. 4-282, which was pointed out earlier,
In the stator fin of No. 499 “Fin with rudder”, as shown in FIG. 7, the central hole of the boss of the stator fin is externally fitted to the protruding shaft at the front end of the lower end of the ladder horn. On the other hand, in the present invention, the protruding rear end boss of the stator fin is fitted in the hole at the lower end front end of the ladder horn by insertion. Due to this difference in the fitting structure, in the present invention, the stator fin boss has a small diameter, so that the water resistance thereof can be reduced and the stator fin can be firmly and detachably fitted to the rudder horn with a lightweight structure. However, such a merit cannot be expected with the structure of FIG.

Further, in the present invention, as shown in FIGS. 1 to 5, since the axial center of the stator fin 4 and the axial center of the propeller 2 are coaxial, the swirling wake of the propeller is effectively a linear wake. However, in the structure shown in FIG. 7, the shaft center of the stator and the shaft center of the propeller are eccentric from each other by the eccentric amount e, and therefore the above-described merit cannot be expected.

Further, in the present invention, as shown in each embodiment, the distance Ls between the rear end of the propeller boss and the front end of the boss of the stator fin is larger than the axial length Lp of the propeller boss. In the structure of FIG. 7, there is no such magnitude relation. Therefore, in the present invention, after the stator is removed, the propeller shaft can be moved backward to be removed and fitted again with the propeller shaft being left as is, but in the structure of FIG. 7, the propeller shaft is pulled out forward as before. Without it, the propeller cannot be cleaned and inspected.

In short, according to the first aspect of the invention, the rear end of the boss of the stator blade, which is coaxially arranged immediately after the screw propeller and has a plurality of blades of substantially equal length arranged in a radial projection, is connected to the rudder horn. The lower end of the propeller is fitted in the hole in the axial direction of the propeller to improve the propulsion force, and the propeller can be removed and installed safely, quickly, labor-saving and labor-saving. Simple structure and low cost In order to obtain a high-performance and economical propeller device with stator for ships,
The present invention is extremely useful in industry.

According to the invention of claim 2, claim 1
In order to improve the propulsive force and to remove and install the propeller, an axial gap longer than the boss length of the propeller is provided between the front end of the stator blade and the rear end of the propeller. INDUSTRIAL APPLICABILITY The present invention is extremely useful industrially because a propeller device with a stator for a marine vessel, which has a structure that is safe, quick, labor-saving, and labor-saving, has a simple structure, is inexpensive, and has high performance, is economical.

Further, according to the invention of claim 3, in claim 1, the radial length of the stator blade is made shorter than the radius of the propeller, so that the propulsion force is improved and the propeller INDUSTRIAL APPLICABILITY The present invention is extremely useful industrially because a propeller device with a stator for a marine vessel that has a simple structure that performs removal and installation work safely, quickly, labor-saving, and labor-saving, and that has a low cost and high performance is obtained.

According to the fourth aspect of the present invention, by combining the first and second aspects, the propulsion force can be improved, and the propeller can be removed and installed safely, quickly and labor-saving and labor-saving. Simple structure, low cost, high performance economical propeller device with stator for ship,
The present invention is extremely useful in industry.

According to the invention of claim 5, by combining claim 1 and claim 3, the propulsion force is improved, and the propeller is removed and installed safely, quickly and labor-saving and labor-saving. Simple structure, low cost, high performance economical propeller device with stator for ship,
The present invention is extremely useful in industry.

According to the sixth aspect of the present invention, by combining the first aspect, the second aspect, and the third aspect, the propulsion force is improved, and the propeller dismounting and mounting work is performed safely, swiftly, and with less labor. The present invention is extremely useful industrially because a propeller device with a stator for a marine vessel, which has a simple structure, low cost, and high performance, can be obtained economically.

[Brief description of drawings]

FIG. 1 is a side view showing a propeller and a stator portion of a first embodiment of the present invention.

FIG. 2 is a front view of the stator of FIG. 1 taken along the line II-II.

FIG. 3 is a side view showing a mounting portion for a ladder horn and a stator according to a second embodiment of the present invention.

FIG. 4 is a side view of a stern part showing a third embodiment of the present invention.

5 is a front view taken along the line VV of FIG.

FIG. 6 is a side view showing a stern part of a conventional ship.

7A and 7B are a side view and a partial perspective view showing the structure described in Japanese Patent Application Laid-Open No. 4-282499, "Rudder with fins".

[Explanation of symbols]

 1 Hull 2 Propeller 2a Propeller Boss 3 Ladder 4 Stator Fin 5 Boss 5a Rear End Boss 6 Ladder Horn 7 Hole 8 Protrusion 9 Side Pin

Claims (6)

[Claims] 1. A rear end of a boss of a stator blade, which is arranged coaxially immediately after the screw propeller and has a plurality of blades of substantially equal length arranged to project radially, is bored at a front end of a lower end of a ladder horn. A propeller device with a stator for a ship, which is fitted in a hole in the propeller axial direction. 2. A propeller with a stator for a marine vessel according to claim 1, wherein an axial gap longer than a boss length of the propeller is provided between a front end of the stator blade and a rear end of the propeller. apparatus. 3. A propeller device with a stator for a marine vessel according to claim 1, wherein a radial length of the stator blade is shorter than a radius of the propeller. 4. A propeller device with a stator for a marine vessel, wherein the propeller device has a combination of claim 1 and claim 2. 5. A propeller device with a stator for a marine vessel, which has both claim 1 and claim 3. 6. A propeller device with a stator for a marine vessel, which combines the features of claim 1, claim 2 and claim 3.