JP4376618B2 - Pod type propeller and ship equipped with the same - Google Patents

Description

  The present invention relates to a pod type propeller in which an electric motor is built in a pod attached from the bottom of a ship via a strut, and a propeller is connected to an output shaft of the electric motor, and in particular, heat generated by the electric motor is efficiently removed outside the pod. It relates to a pod type propeller.

  In ships, electric propulsion systems are attracting attention for the purpose of unifying ship power sources and reducing vibration. Among them, in particular, a so-called “pod type propeller” in which a drive motor is built in a casing (pod) disposed on a bottom of a ship so as to be able to turn 360 ° in a horizontal plane and a propeller is directly connected to an output shaft of the motor. It has already been put into practical use because it has various advantages such as no need for a shaft, no rudder, and no need for a thrust raster.

  As disclosed in Patent Document 1, since the pod type propeller is formed by sealing the electric motor in the pod, there is a problem of heat treatment generated by the electric motor. The electric motor disclosed in this document is almost directly covered with a pod, and is designed to dissipate heat into water by heat conduction through the pod.

  The removal of heat from an electric motor is a particularly important requirement in the design of a pod type propeller because it greatly affects its size. When using a motor that can withstand higher temperatures, the size of the motor increases significantly with the increase in heat-resistant temperature. Efficiency is significantly reduced.

  Therefore, in order to increase the heat removal efficiency and thereby prevent the propulsion efficiency from being lowered, in Patent Document 1, a gas cooling device is provided on the hull side, and the gas refrigerant is passed through the inside of the strut connecting the hull and the pod. A structure is disclosed in which gas refrigerant is passed along a rib in the direction of the output shaft formed between the output shaft of the electric motor and its rotor, and heat is directly removed from the rotor and stator. .

  However, as disclosed in the above-mentioned Patent Document 1, the portion connected to the strut of the pod (hereinafter referred to as “strut connecting portion”) is a stator arranged so as to surround the rotor of the electric motor. Since it includes a part (upper part) of the pod shell that just covers the outer periphery, it was difficult to radiate heat from this part to the outside.

  From this viewpoint, Patent Document 1 discloses a structure in which a gas refrigerant passage is formed from the strut connection portion of the pod to the inside of the strut, and heat is removed from the entire electric motor in accordance with the above method.

However, the cooling structure disclosed in Patent Document 1 requires a huge blower and a gas cooling device for pumping the gas refrigerant for cooling by the gas refrigerant.
JP 2002-362487 A

  The present invention has been made in view of such circumstances, and does not require a huge blower and a gas cooling device, and can cool the motor more efficiently. It aims at providing the pod type propeller which can improve propulsion efficiency, and a ship provided with the same.

Pod propeller according to the present onset Ming, a built-in electric motor pod attached via a strut from the vessel bottom, in the pod propeller linked a propulsion propeller to the output shaft of the electric motor, through the cooling oil inside the pod Ru Citea to flow to cool the previous Symbol electric motor.

Also, before Symbol strut, so that the outer shell surface of the pod at the connection portion between the pod is exposed to more external, Ri tare a recess, the recess is partitioned by internal struts, a partitioned space the Ru tare forms a circulation path of the cooling oil.

According to the onset bright, because of cooling by the cooling oil, the giant blower and gas cooling device is unnecessary, and further, the electric motor, can also be simultaneously lubricated and thus the output shaft, to increase the corrosion protection Can do. Oil cooling has a higher cooling effect than conventional gas cooling, which mainly uses air, and thus an electric motor with lower heat resistance can be employed. In other words, since a smaller size electric motor can be employed, the pod diameter can be significantly reduced when compared with the same pod length, thus increasing propulsion efficiency.

  By including a bearing that rotatably supports the output shaft of the electric motor in the cooling oil path, the cooling and lubrication of the bearing can be achieved simultaneously with the cooling of the electric motor. In the conventional configuration, the bearing lubrication system includes the lubricating oil reservoir and the oil feeding device provided on the hull side, and the lubricating oil pipe disposed in the strut. If the space inside the strut itself is included in the lubricating oil path, such a lubricating oil pipe can be dispensed with.

  Further, it is possible to promote the flow of the cooling oil by providing fins that promote the flow of the cooling oil on the output shaft of the electric motor.

Furthermore, the partial (strut connecting portion) connected to the strut of the port head, as the pod shell surface of the moiety is exposed to more external, by forming a recess in the strut, the water of the pod external The strut connection can be cooled efficiently.

  The strut connecting portion only needs to be configured so that the surface of the pod outer shell in this portion is more exposed to the outside, but the strut recess formed in the portion continuous to the strut connecting portion is as described above. Since the main purpose is cooling of the electric motor, the portion adjacent to the electric motor is desirable.

  An example of a specific configuration of the concave portion is a “necked” portion formed on a part or the whole of the strut. Another example is a through recess formed in a part of a strut.

Moreover, a further advantage according to the present onset Ming, the recess is to be constructed a circulation path of the cooling oil inside the strut. That is, since the size of the strut is generally reduced in the width direction due to the formation of the concave portion, it is possible to form a reciprocating path of the cooling oil by the partitioned space by using the concave portion as a partition. In order to keep the size of the motor itself small, it is desirable that the cooling oil reservoir and the oil feeding device are arranged on the hull side. It is necessary to provide the piping. Therefore, such a pipe can be made unnecessary by making the inside of the strut a part of the cooling oil path.

Oite herein onset light as described above, it is possible to adopt a variable pitch propeller. Conventionally, the rotational speed of the electric motor has been controlled by a rotational speed control device arranged on the hull side. However, such a rotational speed control device is relatively expensive and has a large size. The adoption of the type propeller itself was virtually impossible. In contrast, variable pitch propellers can be pitch controlled with a relatively inexpensive and small hydraulic system and can be used in small vessels as well as average the motor load over the entire navigation speed range. Therefore, there are many advantages such as being able to always operate at the rated voltage and obtain the maximum propulsion torque.

  Hereinafter, a pod type propeller according to the present invention will be specifically described with reference to the accompanying drawings.

  FIG. 1 is a side sectional view showing a configuration of a pod type propeller according to an embodiment of the present invention. As shown in FIG. 1, the pod type propeller 1 of the present embodiment includes a strut 2 attached to a platform 9 provided on the ship bottom. The strut 2 extends downward, and a pod 3 is provided at the lower end thereof. The pod 3 extends in a substantially horizontal direction, and an output shaft 40 of the electric motor 4 is disposed along the direction. Both ends of the output shaft 40 are supported by the pod 3 through bearings 61 and 62 so as to be rotatable about the shaft, and one end thereof (here, the bearing 61 side) protrudes from the pod 3 to the outside. . The variable pitch propeller 5 is directly attached to the tip of the output shaft 40 that protrudes from the pod 3 to the outside.

  A rotor 41 of the electric motor 4 surrounds the output shaft 40 and is fixed so as to rotate integrally with the output shaft 40 at the central portion in the longitudinal direction of the output shaft 40, and on the outer side of the rotor 41, the electric motor 4 The stator 42 is provided so as to surround the rotor 41. The stator 42 is fixed in contact with the inner surface of the outer shell 30 of the pod 3 with a predetermined gap from the rotor 41. In the present embodiment, the stator 42 is directly fixed to the outer shell 30. However, as long as the heat from the stator 42 is efficiently transferred to the outer shell 30, the space between them is not limited. An appropriate heat conductive member may be interposed between the two.

  A blade angle variable oil supply device 63 is provided at the end of the output shaft 40 opposite to the side where the propeller 5 is provided. The blade angle change oil supply device 63 is connected to a change oil supply device (not shown) disposed on the hull side via a pressure oil pipe 64 extending from the inside of the pod 3 through the inside of the strut 2. Receives the pumping of variable oil from the variable oil supply device. The output shaft 40 provided with the blade angle variable oil supply device 63 is hollow over its entire length, and a pressure oil introduction pipe 43 of the same length is formed on the inner periphery of the output shaft 40 as appropriate. It is inserted with a gap.

  The wing angle variable oil supply device 63 is selectively used in the pressure oil introduction pipe 43 and the annular space between the pressure oil introduction pipe 43 and the inner peripheral surface of the output shaft 40 in accordance with a command given from the hull side. The pressure change oil is pumped into the output shaft 40 on the side where the propeller 5 is attached, and the blade angle adjusting mechanism 50 disposed inside the hub 51 of the propeller 5 is connected to the output shaft 40. The pitch of the blades 52 of the propeller 5 is adjusted by operating in the direction.

  The upper end portion of the strut 2 has a conical shape opened upward, and this portion is provided on the platform 9 so as to be rotatable. Further, gear teeth 31 are provided around the inner peripheral surface of the upper end portion of the strut 2, and a pinion gear 70 attached to the output shaft of the electric motor 7 disposed on the hull side is provided on the gear teeth 31. It is in mesh. As a result, the electric motor 7 is rotated so that the pod 3 can be rotated 360 ° together with the strut 2.

  The portion of the strut 2 that extends downward from the platform 9 has an oblong cross section that is flat in the direction of the output shaft 40 and is formed to have a large cross section that extends downward, and extends over almost the entire length of the pod 3. Yes. In addition, a recess 20 is provided in the central portion of the strut 2. In the present embodiment, the recess 20 is shown in FIG. 2A in FIG. 2A-IIa cross-sectional view and FIG. ) Are formed so as to penetrate in the width direction as shown in the IIb-IIb cross-sectional view of FIG. As shown in FIG. 1, the recess 20 has a substantially triangular shape in a side view, and its bottom surface portion is formed of a part of the outer shell 30 of the pod 3 that surrounds the stator 42 of the electric motor 4. Therefore, according to this configuration, the outer shell 30 portion of the pod 3 surrounding the stator 42 of the electric motor 4 is completely exposed to water over the entire circumference including the strut connection portion. The cooling of (especially the stator 42) is averaged over the entire circumference.

  In the present embodiment, the concave portion 20 having a substantially triangular shape in a side view is illustrated, but the upper portion of the outer shell 30 portion of the pod 3 surrounding the stator 42 of the electric motor 4 is blocked by connection with the strut 2. The outer shell 30 surface having a larger area may be configured to be exposed to the water without being removed. For example, as shown in FIG. 4, the outer surface of the pod 3 surrounding the stator 42 of the electric motor 4 is removed. A slit-like recess 20a along the direction of the output shaft 40 of the electric motor 4 may be provided in a portion of the strut 2 adjacent to the shell 30 portion.

  Further, in order to achieve the above object, the recess 20 does not need to penetrate the strut 2 in the width direction, and reduces the width dimension, that is, in FIGS. 3 (a) and 3 (b). As shown, a similar effect can be obtained by providing a “dent” -shaped recess 20b. In addition, as shown in FIGS. 3A and 3B, the “recessed” concave portion 20b does not need to be depressed from both sides in the width direction, and can be configured to be depressed from one side.

  Returning to FIG. 1, the pod type propeller 1 according to the present embodiment has a configuration in which the electric motor 4 is cooled by being immersed in the cooling oil. The cooling oil is pumped from the cooling oil supply device 8 disposed on the hull side, and is configured to circulate throughout the strut 2 and the pod 3 as indicated by black arrows in FIG. ing. The component of the cooling oil is of a type that can also carry out a lubricating action of each part of the pod type propeller 1 as described later.

  The inside of the strut 2 is divided into two in the direction of the output shaft 40 by the concave portion 20 as described above, with one (the non-propeller 5 side in FIG. 1) as the cooling oil forward path and the other (the propeller 5 side) as the return path. is there. Of course, in the present invention, it is possible to subdivide into a larger number of routes.

  The upper end of the cooling oil forward path is connected to a discharge port (not shown) of the cooling oil supply device 8, and the lower end thereof is guided to the side of the pod 3 opposite to the propeller 5. The cooling oil sent into the pod 3 with such a configuration lubricates the bearing 62 on this side, while the output by the fins 44 provided on the output shaft 40 between the bearing 62 and the electric motor 4 As the shaft 40 rotates, it is sent to the electric motor 4 side.

  As shown in a partially enlarged view of FIG. 1, a plurality of (four in this embodiment, as shown in FIG. 2A) ribs are provided on the outer peripheral surface of the output shaft 40 of the electric motor 4. 45 are erected radially. The rib 45 extends substantially over the entire length of the rotor 41 along the direction of the output shaft 40, whereby the output shaft 40 supports the rotor 41 via these ribs 45. On the other hand, as shown in FIG. 6, the rotor 41 and the stator 42 of the electric motor 4 are each configured by alternately arranging a block in which a plurality of thin silicon steel plates 46 are laminated and a plurality of spacers 47 in the direction of the output shaft 40. It becomes.

  As a result, the cooling oil sent from the fins 44 flows in the axial direction along the rib 45 on the outer peripheral surface of the output shaft 40 of the electric motor 4 as shown by arrows in FIG. 6, thereby cooling the output shaft 40. At the same time, the rotor 41 is cooled from the inside. At this time, a part of the cooling oil flowing in the axial direction along the rib 45 enters the gap 48a between the thin plate laminated blocks of the rotor 41, and cools the rotor 41 from between the blocks. The oil also enters the annular gap 48c between the rotor 41 and the stator 42, cools the rotor 41 from the outside, and cools the stator 42 from the inside. Further, in order to allow a part of the cooling oil that has passed through the gap 48a to enter the gap 48b between the thin plate lamination blocks of the stator 42 and cool the stator 42 from between the blocks, for example, the thin plate lamination of the stator 42 A hole (not shown) penetrating in the output shaft 40 direction may be formed in the block.

  In this manner, the cooling oil flowing out from the annular gap 48c between the rotor 41 and the stator 42 of the electric motor 4 in the direction of the output shaft 40 and the cooling oil flowing out from the rib 45 are shown by black arrows in FIG. As shown in the figure, a part of the bearing 61 lubricates the bearing 61 on this side, while flowing upward through the cooling oil return path of the strut 2, and from the upper end of the strut 2 to the reflux port (not shown) of the cooling oil supply device 8 ).

  As described above, the electric motor 4 is cooled from the outer stator 42 by water outside the recess 20 and is cooled from the inner rotor 41 mainly by the cooling liquid of the ribs 45.

In this embodiment, the recess 20 and the partition plate 21 extending upward from the upper part form the forward and backward paths of the coolant in the strut 2, but the slit shape as shown in FIG. In the case of the configuration including the recess 20a, the partition plate extension 22 may be formed below the partition plate 21 so as to have the same shape as the triangular recess 20 as a whole. Furthermore, in the case of a configuration provided with a “ dent ” -shaped recess 20b (see FIGS. 3A and 3B), the strut 2 is not in close contact with the outer plate so that it does not act as a partition plate. In this case, as shown in FIG. 5, a partition plate extension 23 may be formed so as to reach the electric motor 4 below the partition plate 21. In this case, the strut connection portion is not cooled by the external water, but is cooled by the coolant flowing inside.

  In the above-described embodiment, the propeller 5 is arranged on one side of the pod 3, but the propeller 5 is arranged on the other side of the pod 3, and further, on both sides. It goes without saying that the effects of the present invention can be enjoyed even with a configuration in which the propeller 5 is provided.

  As described above, according to the pod type propeller and the ship equipped with the pod type propeller according to the present invention, a huge blower and a gas cooling device are unnecessary, and the motor can be cooled more efficiently. The present invention has an excellent effect that the propulsion efficiency can be improved by reducing the size of the cylinder.

It is a sectional side view which shows the internal structure of the pod type propeller which concerns on embodiment of this invention. It is a figure which shows the structure of the recessed part formed in the pod type | mold propeller shown in FIG. 1, (a) is IIa-IIa sectional drawing of FIG. 1, (b) is IIb-IIb sectional drawing of FIG. It is sectional drawing which shows another embodiment of a recessed part corresponding to Fig.2 (a) and (b), respectively. It is a side view of the pod type | mold propeller which shows another embodiment of a recessed part, and the structure of the partition plate which bisects the going path of a cooling oil path inside a strut and a return path is also shown. It is a side view of the pod type propeller which shows another embodiment of a partition plate. FIG. 2 is a partially enlarged view showing a detailed configuration of a cooling oil path formed in the electric motor of the pod type propeller shown in FIG. 1.

Explanation of symbols

1 Pod type propeller
2 struts
3 Pods
4 Electric motor
5 Variable pitch propeller
7 Electric motor
8 Cooling oil supply device
9 Platform
20, 20a, 20b recess
21 Partition plate
22, 23 Divider extension
30 Pod shell
31 gear teeth
40 output shaft
41 rotor
42 Stator
43 Pressure oil inlet pipe
44 fins
45 ribs
46 Silicon steel sheet
47 Spacer
48a, 48b, 48c gap
50 Blade angle adjustment mechanism
51 hub
52 blade
61, 62 Bearing
63 Wing angle change oil supply device
64 Pressure oil piping
70 Pinion gear

Claims (8)

In a pod type propeller in which a motor is built in a pod attached from the bottom of the ship via a strut, and a propeller for propulsion is connected to the output shaft of the motor,
Cooling oil is passed through the pod, and the electric motor is cooled.
A recess is formed in the strut so that the outer surface of the outer shell of the pod at the connecting portion with the pod is more exposed to the outside .
A pod type propeller characterized in that the inside of the strut is partitioned by the recess and a circulation path of the cooling oil is formed by the partitioned space . The recess, pod propeller according to claim 1, characterized in that the portion adjacent to the electric motor. The pod type propeller according to claim 1 or 2 , wherein the concave portion is formed by constricting a part or the whole of the strut. The recess claim 1 or 2 pod propeller according to characterized in that the through-recess formed in a part of the strut. The pod type propeller according to any one of claims 1 to 4, wherein the cooling oil path includes a bearing that rotatably supports an output shaft of the electric motor. The pod type propeller according to any one of claims 1 to 5 , wherein a fin for promoting the flow of the cooling oil is provided on an output shaft of the electric motor. The pod type propeller according to any one of claims 1 to 6 , wherein the propeller is a variable pitch propeller. A ship provided with the pod type propeller according to any one of claims 1 to 7 .

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