JP2004168222A - Contra-rotating propeller device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contra-rotating propeller device capable of performing the sensitive complicated operation and being applied to various uses. <P>SOLUTION: A rear propeller 6 mounted on an inner shaft 5 is a variable pitch propeller of which a blade mounting angle is variable, and rotated and driven by a main engine 1 as a first driving device through a reducer 8 and a variable pitch propeller adjusting device 11. A front propeller 4 mounted on a cylindrical outer shaft 3 coaxial with the inner shaft 5, is a fixed pitch propeller, and rotated and driven in the direction opposite to the rear propeller 6 by a main engine 1' as a second driving device through a reducer 9 for the fixed pitch propeller. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a contra-rotating propeller device.
[0002]
[Prior art]
As a conventional contra-rotating propeller device, for example, there is a contra-rotating propeller device as shown in FIG. 3, which is driven by a main engine 1 such as a diesel engine or a gas turbine as a driving device via a contra-rotating gear device 2. A front propeller 4 attached to the rear end of the cylindrical outer shaft 3 and a rear end of an inner shaft 5 arranged concentrically so as to pass through the center of the outer shaft 3. The rear propeller 6 is rotated in directions opposite to each other, and waste energy accompanying the rotational flow of the front propeller 4 is recovered by the rear propeller 6 and converted into effective propulsion.
[0003]
As another example of a conventional contra-rotating propeller device, as shown in FIG. 4, a front propeller 4 is driven to rotate by a main engine 1 and a rear propeller 6 is connected to an electric motor provided in a rudder portion of a stern. There is also a configuration in which the front propeller 7 is driven to rotate in the direction opposite to the front propeller 4.
[0004]
Note that, for example, Patent Document 1 discloses a contra-rotating propeller device as described above.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-234491
[Problems to be solved by the invention]
Although the contra-rotating propeller device as described above is mainly used for ships such as cargo ships, the front propeller 4 and the rear propeller 6 are fixed pitch propellers (FPPs). It has been difficult to adopt it for passenger ships that require delicate and complicated operations, such as when berthing in a bay, or for car shipping such as ferries.
[0007]
In order to enable a delicate and complicated operation at the time of berthing in a bay or the like, the rear propeller 6 is replaced with a variable pitch propeller (CPP: Controllable Pitch Propeller) which can change a mounting angle of a blade. However, it was technically difficult to make the rear propeller 6 of the contra-rotating propeller device provided with the contra-rotating gear device 2 as shown in FIG. 3 a variable pitch propeller.
[0008]
The rear propeller 6 of the contra-rotating propeller device as shown in FIG. 4 is structured to be rotationally driven in the opposite direction to the front propeller 4 by an electric motor 7 provided in the rudder portion of the stern. It is difficult to make the rear propeller 6 a variable pitch propeller because of its structure, and it is not preferable because it increases the weight of the rudder.
[0009]
The present invention has been made in view of such circumstances, and has as its object to provide a contra-rotating propeller device capable of performing delicate and complicated operations and applicable to various uses.
[0010]
[Means for Solving the Problems]
The present invention provides a contra-rotating propeller device configured to rotate two propellers disposed in front and rear in opposite directions.
The present invention relates to a contra-rotating propeller device characterized in that at least one of the propellers is a variable pitch propeller capable of changing a mounting angle of a blade.
[0011]
In the contra-rotating propeller device, the rear propeller may be a variable pitch propeller capable of changing the mounting angle of the blade, and the front propeller may be a fixed pitch propeller.
[0012]
Further, the rear propeller attached to the inner shaft is rotationally driven by the first driving device via the speed reducer and the variable pitch propeller changing device, and the cylindrical outer shaft disposed coaxially with the inner shaft. The front propeller mounted on the shaft may be configured to be rotationally driven by the second driving device via a fixed pitch propeller speed reducer.
[0013]
Further, the first drive device is used as a main engine, and the second drive device is used as a main engine. Alternatively, the first drive device is used as a main engine, and the second drive device is used as an electric motor. You can also.
[0014]
According to the above means, the following effects can be obtained.
[0015]
When the contra-rotating propeller device of the present invention is applied to a passenger ship or a car carrier such as a ferry, when berthing in a bay or the like, the angle of attachment of the propeller blades as a variable pitch propeller is appropriately changed and the output and By rotating the propeller while adjusting the load, it is possible to operate the boat.
[0016]
On the other hand, during cruising, the two propellers arranged in front and behind are driven to rotate in opposite directions, thereby increasing propulsion efficiency, reducing the required horsepower for propulsion, and reducing fuel consumption. Not only that, it is also possible to reduce the amount of exhaust gas emitted, which is also useful for global environment preservation.In addition, by adopting a contra-rotating propeller, the diameter of the propeller can be reduced, improving the maneuverability in rough weather Also leads.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 is an example of an embodiment of the present invention, in which parts denoted by the same reference numerals as those in FIGS. 3 and 4 represent the same parts, and a rear propeller 6 attached to an inner shaft 5 is not shown. A variable pitch propeller capable of changing the mounting angle of the blades, and is driven to rotate by a main engine 1 such as a diesel engine or a gas turbine as a first driving device via a speed reducer 8 and a variable pitch propeller changing device 11. The front propeller 4 attached to the cylindrical outer shaft 3 disposed concentrically with the inner shaft 5 is a fixed pitch propeller, and the main propeller such as a diesel engine or a gas turbine as a second driving device is used. The engine 1 ′ is configured to be rotationally driven in a direction opposite to the rear propeller 6 via a fixed pitch propeller speed reducer 9.
[0019]
Next, the operation of the illustrated example will be described.
[0020]
At the time of berthing in a bay, etc., the front propeller 4 as a fixed pitch propeller is idled, and the output angle and load are adjusted by appropriately changing the mounting angle of the blades of the rear propeller 6 as a variable pitch propeller. While the main engine 1 rotates the rear propeller 6 via the speed reducer 8 and the variable pitch propeller changing device 11, the ship can be maneuvered.
[0021]
On the other hand, during cruising, the rear propeller 6 is rotationally driven by the main engine 1 via the speed reducer 8 and the variable pitch propeller changing device 11, and the main engine 1 'is driven via the fixed pitch propeller speed reducer 9 by the front engine. By driving the propeller 4 to rotate in the opposite direction to the rear propeller 6, it is possible to increase the propulsion efficiency, reduce the required horsepower for propulsion, and reduce the fuel consumption. The amount of exhaust gas can be reduced, which will also contribute to global environmental conservation.
[0022]
In the case of a system using a contra-rotating propeller device, although there is a difference depending on the ship type, it has been confirmed from the results of water tank tests and sea trials that the propulsion horsepower can be reduced by about 10 to 15%. I have.
[0023]
In addition, by adopting a contra-rotating propeller, the diameter of the propeller can be reduced, which leads to an improvement in maneuverability in rough weather.
[0024]
In this way, delicate and complicated operations can be performed at the time of berthing in the bay and the like, and the present invention can be applied to not only ships such as cargo ships, but also passenger ships or car shipping ships such as ferries.
[0025]
In addition, since it has two independent drive units, it is possible to use one of the drive units for emergency cruising, and if it is used for a dangerous goods carrier such as an LNG ship or tanker, the drive at the port Device maintenance becomes possible.
[0026]
FIG. 2 shows another example of the embodiment of the present invention. In the figure, portions denoted by the same reference numerals as those in FIG. 1 represent the same components, and the basic configuration is the same as that shown in FIG. However, the feature of this illustrated example is that, as shown in FIG. 2, an electric motor 10 is used as the second drive device instead of the main engine 1 'such as a diesel engine or a gas turbine. is there.
[0027]
In the example shown in FIG. 2, the same operation and effect as in the example shown in FIG. 1 can be obtained.
[0028]
Note that the contra-rotating propeller device of the present invention is not limited to the above-described illustrated example, but may be applied to aircraft other than ships, etc., as long as it does not deviate from the gist of the present invention. Of course, various changes can be made.
[0029]
【The invention's effect】
As described above, according to the contra-rotating propeller device of the present invention, a delicate and complicated operation can be performed, and an excellent effect that it can be applied to various uses can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an example of an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of another example of an embodiment of the present invention.
FIG. 3 is a schematic configuration diagram of an example of a conventional contra-rotating propeller device.
FIG. 4 is a schematic configuration diagram of another example of a conventional contra-rotating propeller device.
[Explanation of symbols]
1 main engine (first drive unit)
1 'main engine (second drive unit)
3 Outer shaft 4 Front propeller (propeller)
5 Inner shaft 6 Rear propeller (propeller)
8 speed reducer 9 speed reducer for fixed pitch propeller 10 motor (second drive device)
11 Variable pitch propeller changing device

Claims (5)

In a contra-rotating propeller device configured to rotate two propellers disposed in front and rear in opposite directions,
A contra-rotating propeller device, wherein at least one of the propellers is a variable pitch propeller capable of changing a mounting angle of a blade. 2. The contra-rotating propeller device according to claim 1, wherein the rear propeller is a variable pitch propeller capable of changing a mounting angle of the blade, and the front propeller is a fixed pitch propeller. The rear propeller attached to the inner shaft is rotationally driven by the first drive device via a speed reducer and a variable pitch propeller changing device, and the cylindrical outer shaft is arranged concentrically with the inner shaft. 3. The contra-rotating propeller device according to claim 2, wherein the mounted front propeller is rotationally driven by a second driving device via a fixed pitch propeller speed reducer. 4. The contra-rotating propeller device according to claim 3, wherein the first driving device is a main engine and the second driving device is a main engine. 4. The contra-rotating propeller device according to claim 3, wherein the first drive device is a main engine and the second drive device is an electric motor.

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