JPH01226489A - Propulsion unit of submarine boat - Google Patents

Abstract

PURPOSE:To suppress reaction torque from a propeller by forcing a pair of propellers having mutually reversed pitches and coaxially arranged in double layers in the axial direction to turn reversely to each other by means of a counter rotating shaft to produce thrust. CONSTITUTION:A pair of driving means 14, 15 are supplied with electric power and driven in rotation in mutually opposite directions. Thereby, the inner/outer side rotary shaft 12, 13 of a counter rotating shaft 11 are rotated in mutually reverse directions so that a pair of propellers 25, 26 are driven in mutually reverse turns. The pair of propellers 25, 26 are constructed with mutually opposite pitches so that each thrust is generated in the same direction through mutually reversed driving. Further, reaction torque can be suppressed by rotations in both directions so that rotational force around the shell may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a propulsion device for a submersible that is suitable for use in a submersible such as a submarine that has an axially symmetrical hull shape with respect to a rotationally driven propulsion shaft.

[Prior Art] FIG. 4 shows a diving 1ii1 as a conventional example.
This submarine 1 has a ship shape that is approximately axially symmetrical with respect to a propulsion shaft 3 that is disposed along the ship's length and transmits rotational driving force to a single screw propulsion device 2. The propulsion shaft 3 is rotationally driven by an electric motor 4 having a general structure, and this electric motor 4 receives electric power from a battery 7 charged with electric power from a power generation 816 that is driven by a prime mover 115 and generates electricity. is configured to be supplied. In particular, such a submarine 1 is provided with horizontal and vertical rudders 10 just in front of the bilge keel 9 and the propulsion device 2 in order to maneuver the ship and stabilize the hull 8.

[Problem to be solved by the invention] By the way, the above-mentioned skewer that is rotationally driven in one direction.
It has a screw propulsion device 2 and the hull shape is axially symmetrical with respect to the propulsion shaft 3. Submersibles such as i1 had the following problems.

■ In a submersible that has an axially symmetrical hull shape with respect to the propulsion shaft 3, a significant rotational force is generated around the hull 8 due to the counter torque from the single screw propeller 2 rotating in one direction.
It is necessary to reduce this counter torque. Conventionally, in order to obtain the required horsepower and thrust, the propulsion device is designed to reduce the diameter of the thruster and increase the number of revolutions. For this reason, the propulsion efficiency decreases and the
The increase in circumferential velocity of the ship caused cavitation and the resulting noise when navigating at relatively shallow depths. In addition, it was difficult to increase the horsepower because it was necessary to suppress the reaction torque.

■ Also, due to the hull structure, in order to stabilize the hull 8 against the rotational force around the hull 8 caused by the counter torque, the
It is necessary to form the horizontal and vertical rudders 10 relatively large, and there is also the problem that these increase propulsion resistance.

[Means for Solving the Problems 1] The present invention provides a propulsion system for a submersible vessel such as a submarine that has an axially symmetrical shape with respect to a rotationally driven propulsion shaft, in which an inner rotating shaft is inserted into a hollow outer rotating shaft. A counter-rotating shaft that transmits power coaxially while being reversed with respect to each other, a pair of driving means that respectively drive these inner and outer rotating shafts, and an IrJ axis for each of these inner and outer rotating shafts along the axial direction. It is comprised of a pair of propulsors that are stacked one on top of the other and configured with opposite pitches.

[Function 1] Describing the function of the present invention, a pair of propulsors with opposite pitches arranged coaxially and overlappingly along the axial direction are rotated in opposite directions with counter-rotating shafts to obtain propulsive force. , counter torque from the propulsion device, and rotational force around the hull are suppressed.

[Embodiment 1] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, an inner rotating shaft 13 is inserted into a hollow outer rotating shaft 12, and is rotated by a pair of drive means 14 and 15, which will be described later, to transmit power coaxially. It is a counter-rotating axis.

The outer rotating shaft 12 is rotatably supported by the rear partition wall 16 and the fixed casing 17 of the outer rotating shaft driving means 14 via an annular bearing 18 that circumferentially surrounds the outer rotating shaft 12. Further, the inner rotating shaft 13 located within the outer rotating shaft 12 is located between the outer rotating shaft 12 and the outer rotating shaft 1.
An extended shaft portion 19 extending outward from 2 along the axial direction is attached to the fixed casing 21 and 22 of the inner rotating shaft drive means 15 and the adjacent inner rotating shaft thrust bearing 20,
It is rotatably supported via an annular bearing 23 surrounding the inner rotating shaft 13 in the circumferential direction. Further, this counter-rotating shaft 11 extends outward along the axial direction from the stern end 24 of the submersible, and a bow side screw propeller 25 is attached to the shaft end of the outer rotary shaft 12. At the shaft end of the inner rotary shaft 13 that extends further axially outward from the shaft end of the rotary shaft 12, there is a stern screw propulsion device 26 having a pitch opposite to that of the bow screw propulsion device 25. It is provided coaxially with the bow side screw propulsion device 25 and stacked one on top of the other in the axial direction. And these pair of propellers 25.
26 are driven in opposite directions by the counter-rotating shaft 11 to generate thrust in the same direction.

The counter-rotating shaft 11 configured in this manner has a pair of driving means 14 for driving the inner and outer rotating shafts 12 and 13, respectively.
．． 15 are connected. In this embodiment, the driving means 14
．． As 15, a DC or synchronous motor having an annular configuration that can input power from the outside in the radial direction to the inner and outer rotating shafts 12 and 13 is adopted, and due to the annular configuration, they are arranged coaxially. The shaft end of the outer rotating shaft 12 and the extending shaft portion 19 of the inner rotating shaft 13 extending outward from the outer rotating shaft 12 in the axial direction are arranged so as to surround these from the outside in the radial direction. , are installed on the same axis, stacked on top of each other along the axial direction, so that power can be input coaxially. Specifically, these driving means 14.15 have their fixed casings 17.21 installed on two mounting stands via fixed legs 27.28, and the stators 30, 31 are attached to the fixed casings 17, 21. Along with, a-ta 3
2 and 33 are attached to each rotating shaft 12 and 13, respectively. By driving each rotary wheel 12.13 with a separate drive means 14.15 in this way, each rotary shaft 12.1
3 can be driven individually at arbitrary rotational speeds, that is, rotational speeds that take counter torque into consideration.

Also, the fixed casing 17. of these drive means 14.15.
The insides of the fixed casings 21 are communicated with each other, and cooling air from a blower 34 installed in one of the fixed casings 21 is circulated therethrough.

Furthermore, as a configuration for supporting thrust loads, the thrust force acting on the outer rotating wheel 12 is transmitted to the inner rotating shaft 13,
The inner and outer rotating shafts 1 are connected between this inner rotating shaft 13 and the fixed system.
2.13 The thrust force acting on both sides is collectively supported.

Specifically, the thruster 2
The thrust bearing 35 provided on the 5 side transmits the thrust force from the outer rotation shaft 12 to the inner rotation @ 13, and the thrust bearing 36 provided on the bow side of the inner rotation shaft drive means 15 transmits the inner and outer rotation. The thrust force of both shafts 12 and 13 is supported by the fixed casing 22 of the thrust bearing 36 forming a fixed system. This fixed casing 22 is fixed to a mounting machine stand 29 via fixed legs 37 to support thrust loads.

The power source for the drive IJJ-T stage 14.15 is a combination of a battery, a prime mover, and a generator.

Fuel cells, etc. will be used.

Next, the operation of the embodiment will be described.

When propelling a submersible, a pair of drive means 14.1
5 to rotate these drive means 14 and 15 in opposite directions.

As a result, the inner and outer rotating shafts 12.1 of the counter-rotating shaft 11
3 is then reversely driven to drive the pair of propellers 25 and 26 in reverse. Here, a pair of propulsion 325
．． 26 are configured to have opposite pitches, and by driving in reverse, a thrust force in the same direction is generated to propel the submersible.

By the way, in a submersible that has an axially symmetrical hull shape with respect to the propulsion axis, being equipped with a propulsion device that propels by transmitting rotational force in the opposite direction means that the submersible is rotated only in one direction as in the past. Compared to those with propulsion devices,
By suppressing the reaction torque through bidirectional rotational transmission, the rotational force around the hull can be suppressed as much as possible, and depending on the settings, the ship can be propelled with zero reaction torque. Therefore, it is possible to recover the kinetic energy by increasing the diameter of the propeller at low rotation speeds and by rotating the trailing stream of the propeller, which improves propulsion efficiency, and because there is no need to take reaction torque into account, it is possible to achieve large horsepower. can do. Furthermore, since a propeller with a large diameter and low rotation speed can be used, cavitation and noise generation can be suppressed even when submerged in relatively shallow water.

By installing a large fuel cell, it is possible to provide an almost silent submersible along with the above-mentioned noise reduction.

[Effects of the Invention 1] According to the present invention, the following excellent effects are achieved.

By using a counter-rotating shaft to drive a pair of propellers with opposite pitches, the counter torque from the propellers can be suppressed.
It is possible to improve the propulsion efficiency and increase the horsepower by increasing the diameter of the propulsion device employed in a submarine having an axially symmetrical hull shape with respect to the propulsion axis at low rotation speeds, and it is also possible to reduce cavitation and g noise.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a preferred embodiment of the present invention, FIG. 2 is a view taken along the line nn in FIG. 1, FIG. 3 is a view taken along the line ■-■ in FIG. The figure is a configuration diagram showing a conventional propulsion device. In the figure, 11 is a counter-rotating shaft, 12 is an outer rotating shaft, 13 is an inner rotating shaft, 14.15 is a driving means, and 25.26 is a propeller. Patent applicant Hitoshi Kinutani, patent attorney representing Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1. In a propulsion system for a submersible such as a submarine that has an axially symmetrical hull shape with respect to the propulsion shaft that is rotationally driven, the inner rotary shaft is inserted into the hollow outer rotary shaft, and the dual shaft transmits power coaxially while being reversed. A reversing shaft, a pair of driving means for respectively driving these inner and outer rotating shafts, and a pair of propulsion units that are provided coaxially with these inner and outer rotating shafts and overlapped along the axial direction, and configured with mutually opposite pitches. A propulsion system for a submarine equipped with a vessel.