JP4857442B2 - Pod type propeller - Google Patents

Description

  The present invention relates to a pod type propulsion device for a ship.

  Recently, various pod type propulsors in which a driving machine and a propeller rotating by the pod body hanging from the hull are arranged have been proposed as propulsors in a ship. This pod type propulsion device can be rotated horizontally with respect to the hull by turning means such as a steering device. Therefore, there is an advantage that the propulsion unit structure and rudder structure of the hull can be simplified. For this reason, recent ships tend to be equipped with this pod type propulsion device.

  As a drive machine stored in such a pod type propulsion device, there is a mechanical type such as a diesel engine or an electric motor. However, in the case of a mechanical drive machine, in order to obtain output, the drive machine and the rotating mechanism connected to the drive machine are complicated and large in size, so it is not suitable as a drive machine stored in a pod type propulsion device. It is. Therefore, as a drive machine used for the pod type propulsion device, an electric motor that can be used for a small ship or a high-speed ship and that can downsize the drive machine itself is used. In this case, the electric motor can be housed in the pod body, and the rotation mechanism can be simplified.

However, when using an electric motor, it is necessary to enlarge the coil in order to supply a large current.
Therefore, even in such a case, in order to reduce the size of the electric motor, one using a superconducting motor having a superconducting coil has been proposed (for example, see Patent Document 1).
JP-A-4-304159

Here, in order to maintain the superconducting coil in the superconducting state, it is necessary to install a cooler for cooling the superconducting motive. Moreover, it is necessary to connect a cooler and a superconducting motive by a cooling pipe.
However, the above-mentioned patent documents do not disclose a specific method for supplying the refrigerant.

  The present invention has been made in view of the above-described circumstances. A pod-type propulsion device capable of supplying a refrigerant for cooling a superconducting coil of a superconducting motor in a state where the superconducting motor is arranged in the pod body. The purpose is to provide.

  In order to achieve the above object, according to the present invention, as a first solution means for a pod-type propulsion device, a pod body supported so as to be turnable with respect to a hull, a turning means for turning the pod body, a superconductivity A superconducting motive having a rotating shaft rotated by a magnetic field generated by the coil and the superconducting coil, and a propeller connected to the rotating shaft, and a refrigerant for cooling the superconducting coil of the superconducting motive. A means is provided that includes a filled cooler and a cooling pipe that connects the cooler to the superconducting motive.

  In this means, since the electric motor is a superconducting electric motor, the volume can be reduced even if the output is the same as that of the conventional electric motor.

As a second solving means related to the pod type propulsion device, in the first means, the pod main body has a spheroid shape having a substantially spheroidal shape, and is connected to the swiveling means extending from the pod type container. And a cylindrical connecting portion is employed.
Further, as a third solving means relating to the pod type propulsion device, in the second means described above, there is provided means characterized in that the cooler is disposed and a swivel base connected to the connecting portion is provided. adopt.
In this means, since the cooler essential for cooling the superconducting coil is arranged so as to swivel together with the pod body, the cooling pipe itself connecting the cooler and the superconducting motor is adapted to swivel. It is not necessary to provide this mechanism, and a simpler cooling system can be provided.

As a fourth solving means related to the pod type propulsion device, a means is adopted in which the cooler is placed in the pod type container in the second means.
With this means, the cooling system can be arranged in a pod type container only. Therefore, only the electric system for driving the superconducting motive and the cooler can be led from the hull to the pod body.

As a fifth solving means relating to the pod type propulsion device, in the first or second means described above, means in which a work space into which a person can enter is disposed in the pod main body is adopted. .
In this means, since the superconducting motive is small, even if it is a pod main body having the same size as the conventional one, a working space in which a human can work can be provided. Accordingly, humans can enter the work space in the pod body and perform inspections and maintenance work.

As a sixth solving means relating to the pod type propulsion device, in any one of the above second to fourth means, the outer diameter of the pod type container is ½ or less of the outer diameter of the propeller. Adopt the feature means.
This means can bring the outer diameter of the pod-type container closer to the diameter of the boss portion that becomes the attachment portion of the rotation shaft of the propeller. Therefore, the propulsion efficiency can be greatly improved.

As a seventh means for solving the pod type propulsion device, in the first means, the refrigerant charged in the cooler is liquid nitrogen.
This pod type propulsion device can use liquid nitrogen as a refrigerant, and can handle the refrigerant more easily than liquid helium.

As an eighth solving means related to the pod type propulsion device, in the first to seventh means, the superconducting motor has a field side stator provided with field coils forming N and S poles, and The rotation axis is fixed, and an N-pole inductor arranged to face the N-pole formed by the field coil and an S-pole inductor arranged to face the S-pole formed by the field coil. And an armature-side stator in which an armature coil is disposed opposite to the N-pole inductor and the S-pole inductor, and the field coil and the armature coil are the superconducting coils. It is characterized by being.
Since this pod type propulsion device only has to supply refrigerant to the fixed field coil and armature coil, the configuration of the cooling system can be simplified, and the size of the superconducting motor can be reduced. it can.

As a ninth means for solving the pod type propulsion device, in the eighth means, the cooler is mounted on the hull, and the cooling pipe connects the pod main body and the cooler so as to be relatively movable. It is characterized by that.
In this pod type propulsion device, since the pod main body and the cooler are relatively moved, even when the pod main body rotates with respect to the hull, the refrigerant can be supplied to the superconducting motive through the cooling pipe. . At this time, the cooling pipe may be connected to the fixed portion of the superconducting motive, so that the cooling pipe can have a simple structure.

  According to the present invention, it is possible to safely and easily handle the refrigerant for cooling the superconducting coil of the superconducting motive arranged in the pod body, and to easily perform the maintenance of the cooling system. it can.

A first embodiment according to the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the pod-type propulsion device 1 according to this embodiment includes a pod body 3 that is supported so as to be turnable with respect to the hull 2, and a turn that turns the pod body 3 with respect to the hull 2. A rotating shaft 8 that is rotated by a motor (swivel means) 5, a field coil (superconducting coil) 6, an armature coil (superconducting coil) 7, and a magnetic field generated by these coils is arranged in the pod body 3. The superconducting motor 11 is connected, the propeller 12 attached to the rotating shaft 8, the cooler 13 filled with the refrigerant for cooling the field coil 6 and the armature coil 7, and the cooler 13 and the superconducting motor 11 are connected. A cooling pipe 15 and a swivel base 16 provided with a cooler 13 and connected to the pod body 3 are provided.

The pod body 3 has a substantially spheroid shape, and has a pod-type container 17 in which a space 17A for arranging the superconducting motor 11 is formed. The pod body 3 extends radially outward from the pod-type container 17 and swivels. A cylindrical connecting portion 18 connected to the motor 5 is provided.
The maximum outer diameter (D1) of the pod-type container 17 is approximately ½ of the outer diameter (D2) of the propeller 12.

  The end portion of the connecting portion 18 is provided with an annular mounting portion 18A that rotatably supports the pod-type container 17 and is attached to the bottom side of the hull 2, and a through hole 18a at the center portion. A lid portion 18B that rotatably supports the swivel base 16, and a connection portion 18C to which the outer peripheral surface 18c is rotatably connected to the inner peripheral surface 18b of the mounting portion 18A and the rotational force from the swing motor 5 is transmitted. And. The mounting portion 18A and the connecting portion 18C are connected via a first bearing portion 18D, and the lid portion 18B and the swivel base 16 are connected via a second bearing portion 18E.

  The turning motor 5 includes a motor rotation shaft 5A, and is placed on the lid portion 18B in a state of being inserted into another through hole 18d formed in the lid portion 18B. The inner peripheral surface 18e of the connecting portion 18C has a gear shape and meshes with the gear 20 connected to the motor rotation shaft 5A of the turning motor 5.

  The superconducting motive 11 is, for example, a motor having an axial gap structure, and a pair of field-side stators 22A and 22B provided with a field coil 6 in which N and S poles are formed concentrically, and a rotating shaft. 8 is fixed, and an N pole inductor 23 and an S pole inductor 25 are arranged to face the N pole formed by the field coil 6 and the S pole formed by the field coil 6, respectively. A pair of rotors 26A and 26B disposed inside the pair of field side stators 22A and 22B, and an armature coil 7 disposed to face the N-pole inductor 23 and the S-pole inductor 25. And an armature side stator 27 disposed between the pair of rotors 26A and 26B. The superconducting motor is, for example, a field-side stator formed in a disc shape and fitted into a cylindrical armature-side stator, and surrounded by the field-side stator and the armature-side stator. Thus, a motor having a radial gap structure in which a rotor is arranged may be used.

  The pair of field side stators 22A and 22B are formed of a magnetic material such as a silicon steel plate, iron, permalloy or the like, and are formed in a disk shape. And a heat insulating refrigerant container 30 for cooling. The field coil 6 is made of a superconducting material such as bismuth or yttrium. A plurality of field coils 6 are concentrically embedded on the surfaces of the yokes 28 facing each other at a predetermined angle.

  The pair of rotors 26 </ b> A and 26 </ b> B includes a rotor body 31 that is formed in a disk shape and is made of a nonmagnetic material such as FRP or stainless steel. One end of each of the N-pole inductor 23 and the S-pole inductor 25 is disposed so as to be exposed from one end face of the rotor body 31, and is formed so as to always face the N-pole and S-pole generated by the field coil 6. ing. Further, the other ends of the N-pole inductor 23 and the S-pole inductor 25 are arranged so as to be exposed from the other end face of the rotor body 31 and are formed to face the armature coil 7. Each of them is formed so as to penetrate the rotor body 31 and, for example, is disposed at a point-symmetrical position with the arrangement position of the rotation shaft 8 as the center.

  The armature-side stator 27 is made of a non-magnetic material such as FRP or stainless steel and is formed into a disk-like shape, and an adiabatic refrigerant that is embedded concentrically in the armature body 32 and houses the armature coil 7. And a container 33. The armature coil 7 is disposed, for example, on the same concentric circle as the field coil 6 at a position facing the pair of rotors 26A and 26B. In the hollow portion of the armature coil 7, a highly permeable material for maintaining a superconducting state with respect to the generated magnetic field is disposed.

  When the pod type propulsion device 1 is attached to the hull 2, the field coil 6 disposed in the pair of field side stators 22 </ b> A and 22 </ b> B is connected to a DC power source and a DC electric wiring (not shown) installed in the hull 2. 35 is electrically connected. The armature coil 7 disposed in the armature side stator 27 is electrically connected to an AC power source (not shown) disposed in the hull 2 via an AC electrical wiring 36. The rotating shaft 8 is rotatably connected to the pair of field side stators 22A and 22B and the armature side stator 27. Accordingly, both ends of the rotating shaft 8 are output shafts. The propeller 12 is connected to the end of the rotating shaft 8 on the propulsion direction side by a conical propeller 12A.

  The cooler 13 includes a tank (not shown) filled with liquid nitrogen, and a liquid helium compressor (not shown) disposed around the tank to cool the tank, and is disposed in the cooler 13 and the superconducting motor 11. The heat insulating refrigerant containers 30 and 33 are fixedly connected by the cooling pipe 15. The cooling pipe 15 is disposed so as to penetrate through the through hole 18a and the connecting portion 18 of the lid portion 18B.

  The swivel base 16 extends from the inner peripheral surface of the connecting portion 18 and is attached so as to protrude from the through hole 18a of the lid portion 18B to the outside inside the hull 2. A flat placement surface 16a is disposed at a portion protruding outside from the lid portion 18B. The cooler 13 is disposed on the mounting surface 16 a of the swivel base 16. The swivel base 16 is rotatably connected to the through hole 18a of the lid portion 18B via the second bearing portion 18E. Therefore, when the pod body 3 is turned with respect to the hull 2 by the turning motor 5, the cooler 13 is also turned with respect to the hull 2 together with the pod body 3.

Next, the operation and effect of the pod type propulsion device 1 according to this embodiment will be described.
When driving the pod-type propulsion device 1, the refrigerant is supplied and circulated from the cooler 13 to the superconducting motor 11 through the cooling pipe 15, and the heat insulating refrigerant containers 30 and 33 of the superconducting motor 11 are driven to field the magnetic field. The coil 6 and the armature coil 7 are cooled to a superconducting state. A DC current is supplied from the DC power source to the field coil 6, and an AC current is supplied from the AC power source to the armature coil 7.

  At this time, magnetic poles are generated on the outer and inner peripheries of the field coil 6, and magnetic flux is introduced into the inside from the surfaces facing the field side stators 22 </ b> A and 22 </ b> B of the N pole inductor 23 and the S pole inductor 25. Magnetic flux introduced into the surface facing the armature side stator 27 appears. By supplying three-phase alternating current to the armature coil 7 in this state, a rotating magnetic field is generated around the axis of the armature-side stator 27 due to a phase shift. Therefore, the electromagnetic induction force between the N-pole inductor 23 and the S-pole inductor 25 causes the pair of rotors 26A and 26B to rotate, the rotating shaft 8 to rotate, and the propeller 12 to rotate.

When the traveling direction of the hull 2 is changed, the turning motor 5 is driven to rotate the gear 20 disposed on the rotary shaft 8. At this time, the connecting portion 18 meshed with the gear 20 rotates in the rotation direction of the gear 20. Accordingly, the pod main body 3 turns with respect to the hull 2 together with the connecting portion 18 to change the traveling direction.
On the other hand, as the connecting portion 18 turns, the swivel base 16 connected to the connecting portion 18 turns in the same direction and at the same speed as the pod body 3. For this reason, even if the pod main body 3 turns, the state where the cooler 13 is relatively stationary with respect to the superconducting motive 11 is maintained.

According to this pod type propulsion device 1, since the electric motor is a superconducting motor 11, the volume can be reduced even with the same output as the conventional electric motor. Here, a cooler 13 for cooling the field coil 6 and the armature coil 7 included in the superconducting motor 11 is mounted on a turntable 16 that turns together with the pod body 3. Therefore, it is not necessary to provide a mechanism for coping with the cooling pipe 15 itself that connects the cooler 13 and the superconducting motor 11, and a cooling system having a simple configuration can be provided.
Therefore, handling of the refrigerant of the superconducting motor 11 arranged in the pod main body 3 can be performed safely and easily, and maintenance of the cooling system can be easily performed.

  Further, since the coils of the superconducting motor 11 are all arranged not on the rotor side but on the stator side, the field coil 6 and the armature coil 7 can be reduced in size, and the accompanying cooling system is simplified. be able to. Therefore, it is possible to further reduce the size even if the output is the same as the output obtained from the conventional superconducting motive. Therefore, the maximum outer diameter of the pod type container 17 can be reduced to ½ or less with respect to the predetermined outer diameter of the propeller 12. As a result, with respect to the conventional pod type propulsion device as shown in FIGS. 3 (a) and 3 (b), the outer diameter of the pod body 5 is set outside the propeller boss 12A as shown in FIGS. 3 (c) and 3 (d). It is possible to approach the diameter, and the propulsion efficiency can be improved.

Next, a second embodiment will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment mentioned above, and description is abbreviate | omitted.
The difference between the second embodiment and the first embodiment is that the cooler 13 essential for the superconducting motive 11 of the pod-type propulsion device 40 according to this embodiment is disposed in the pod-type container 42 of the pod body 41. It is a point that has been done.

All of the cooling pipes 15 are also arranged in the pod-type container 42. Accordingly, the swivel base 16 in the first embodiment is not necessary, and the lid 43B of the connecting portion 43 has no through hole for the swivel base.
The propeller 12 is disposed on one end side of the pod-type container 42, and the cooler 13 is disposed on the other end side of the pod-type container 42 with the superconducting motive 11 interposed therebetween.

  According to the pod type propulsion device 40, the refrigerant piping system can be completed only in the pod main body 41. Therefore, the supply system led from the hull 2 to the pod main body 41 can be limited to only the respective electric systems for driving the superconducting motor 11 and the cooler 13.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, one cooler is provided for one superconducting motive. However, a plurality of superconducting motives and a plurality of cooling systems corresponding thereto may be provided. Also in this case, as described above, a plurality of coolers can be respectively arranged in the mounting table or the pod body.
When a flexible cooling pipe that can withstand twisting is employed, the cooler may be fixed to the hull. On the other hand, the cooler may be fixed to an intermediate portion of the connecting portion.

  Furthermore, since the superconducting motive 11 is small, the space for arranging the superconducting motive 11 in the pod-type container can be expanded, and a working space where humans can work can be secured. Accordingly, humans can enter the pod body and perform inspections and maintenance work using this work space.

  Further, instead of the swivel base 16 of the pod type propulsion device 1 according to the first embodiment, as shown in FIG. 5, the swivel base 51 of the pod type propulsion device 50 has substantially the same size as the lid portion 18B. It is good also as what has the mounting surface 51a formed and protruded upwards rather than the turning motor 5. FIG. In this case, not only the cooler 13 but also parts that need to be rotated together with the pod body 3 can be placed on the turntable 51 on the placement surface 51 a.

1 is a perspective view showing a pod type propulsion device according to a first embodiment of the present invention. It is sectional drawing which shows the pod type propulsion device which concerns on the 1st Embodiment of this invention. (A) The side view which shows the conventional pod type propulsion device, (b) The rear view which looked at (a) figure from A direction, (c) The side surface which shows the pod type propulsion device concerning the 1st Embodiment of this invention It is the rear view which looked at a figure and (d) and (c) figure from the A direction. It is sectional drawing which shows the pod type propulsion apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the modification of the pod type propulsion apparatus which concerns on the 1st Embodiment of this invention.

Explanation of symbols

1,40,50 pod type propulsion device, 3,41 pod body, 5 turning motor (turning means), 6 field coil (superconducting coil), 7 armature coil (superconducting coil), 8 rotating shaft, 11 superconducting motor, 12 propeller, 13 cooler, 15 cooling pipe, 16, 51 swivel, 17, 42 pod type container, 18, 43 connecting part, 22A, 22B field side stator, 23 N pole inductor, 25 S pole inductor , 26A, 26B Rotor, 27 Armature side stator

Claims (8)

A pod body that is pivotably supported with respect to the hull;
Swivel means for swiveling the pod body;
A superconducting coil and a superconducting motive having a rotating shaft rotated by a magnetic field generated by the superconducting coil and disposed in the pod body;
A propeller connected to the rotating shaft;
A cooler filled with a refrigerant for cooling the superconducting coil of the superconducting motive;
A cooling pipe connecting the cooler and the superconducting motive ,
The superconducting motive is a field side stator provided with field coils forming N and S poles;
The rotation axis is fixed, and an N-pole inductor arranged to face the N-pole formed by the field coil and an S-pole inductor arranged to face the S-pole formed by the field coil. A rotor having
An armature-side stator in which an armature coil is arranged opposite to the N-pole inductor and the S-pole inductor,
The pod type propulsion device, wherein the field coil and the armature coil are the superconducting coils . The pod body is a pod-type container having a substantially spheroid shape;
The pod type propulsion device according to claim 1, further comprising a cylindrical connecting portion extending from the pod type container and connected to the turning means.   The pod type propulsion device according to claim 2, further comprising a swivel base in which the cooler is disposed and connected to the connecting portion.   The pod type propulsion device according to claim 2, wherein the cooler is disposed in the pod type container.   The pod type propulsion device according to claim 1, wherein a working space into which a person can enter is disposed in the pod main body.   The pod type propulsion device according to any one of claims 2 to 4, wherein an outer diameter of the pod type container is ½ or less of an outer diameter of the propeller.   The pod type propulsion device according to claim 1, wherein the refrigerant charged in the cooler is liquid nitrogen. The cooler is mounted on the hull;
The pod type propulsion device according to any one of claims 1 to 7, wherein the cooling pipe connects the pod main body and the cooler so as to be relatively movable.

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