CN109494935A

CN109494935A - The cooling system and marine propulsion of marine propulsion

Info

Publication number: CN109494935A
Application number: CN201710822614.1A
Authority: CN
Inventors: 易星; 裘富华; 孙健; 胡飞凰; 卓越
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2017-09-13
Filing date: 2017-09-13
Publication date: 2019-03-19

Abstract

The present invention provides one kind to be used for marine propulsion and its cooling system (20), wherein the marine propulsion (100) includes a motor (47), the cooling system is characterized in that, include: first lubrication sump (481), is used to accommodate the first bearing (481) for supporting a motor shaft (43) of the motor (47)；One the second lubrication sump (482) is used to accommodate the second bearing (482) for supporting the motor shaft (43)；And an oil circuit (28), it is built into the inside of the motor shaft (43), and first lubrication sump (481) and second lubrication sump (482) are in fluid communication.

Description

Cooling system for ship propulsion device and ship propulsion device

Technical Field

The present invention relates to a cooling system for a ship propulsion device and a ship propulsion device, and particularly to a pod type ship propulsion device.

Background

A marine propulsion device is a device that provides power to a vessel. Marine propulsors can be divided into two categories, active and reactive, depending on the mode of action. Fibers, sails (see sailing ships) and the like which drive the ship to advance by manpower or wind power are active; the oar, the scull, the paddle wheel, the water jet propeller, the propeller and the like are reaction type. Most modern transport ships adopt reaction type propellers, and the most widely applied mode is a propeller type propeller. Since the motor driving the propeller generates a significant amount of heat during operation, an important way to remove this heat is to transfer it through the stator to the propulsion unit housing, which is exposed to the sea. In an electric motor, the main heat generating components are the rotor, the stator and the terminals of the stator coils. However, the prior fully-covered pod has a large area that cannot be cooled, resulting in locally high temperatures. In general, in order to solve the heat dissipation of the motor, a fan is provided in the propulsion device casing, which drives the circulation of the gas inside the casing for cooling. One problem with this cooling is that in order to make better use of the cooling air through the motor, the motor must be open to allow air to pass through, and a closed motor cannot be used.

Disclosure of Invention

In order to solve one or more of the above-mentioned problems, the present invention aims to provide a cooling system for a ship propulsion device, wherein the ship propulsion device includes an electric motor, the cooling system being characterized by comprising: a first lubrication reservoir for housing a first bearing supporting a motor shaft of the motor; a second lubrication reservoir for receiving a second bearing supporting the motor shaft; and an oil passage configured inside the motor shaft and fluidly communicating the first lubrication reservoir and the second lubrication reservoir. By this design it is possible to effectively utilize the lubrication system of the marine propulsion device itself to take energy from the interior of the motor, whereby it is also possible to use a closed motor without opening the motor. In addition, the cooling system is not only effective for cooling the motor, but also for cooling the first bearing and the second bearing effectively.

According to an advantageous embodiment, the oil circuit comprises: a first branch extending in the axial direction of the motor shaft and communicating with the first lubrication reservoir; and a second branch extending through the motor shaft in a radial direction of the motor shaft to communicate with the second lubrication reservoir and in fluid communication with the first branch. The design mode can process the motor shaft as little as possible, and a passage between the first lubricating pool and the second lubricating pool can be opened. Since in the motor of the ship propulsion device one end of the motor shaft is to be extended to drive the propeller, this second branch can be used for the end bearing near the propeller.

According to an advantageous embodiment, the cooling system further comprises: a pump in fluid communication with said first lubrication reservoir and said second lubrication reservoir; a heat exchanger, which is placed in front of the pump in the flow direction of the fluid in the cooling system. By providing this heat exchanger, the lubricating medium oil temperature can be cooled more effectively.

According to an advantageous embodiment, the cooling system further comprises: a filter placed in front of the heat exchanger in the direction of flow of the fluid in the cooling system. The filter may help to clean the lubrication medium of impurities due to the bearing, which also helps to extend the working life of the bearing.

According to an advantageous embodiment, the cooling system further comprises: at least one additional pump arranged in the first and/or second lubrication reservoir. Whereby the circulation of the entire cooling system can be further enhanced.

Another aspect of the invention provides a marine propulsion device comprising a cooling system as described in any one of the embodiments above.

Another aspect of the present invention also provides an electric machine, including: a motor shaft rotatably supported on a first bearing and a second bearing, wherein said first bearing is received in a first lubrication reservoir and said second bearing is received in a second lubrication reservoir; and wherein an oil passage is provided in the motor shaft that fluidly communicates the first lubrication reservoir and the second lubrication reservoir. By this design, the lubrication system of the motor can be used effectively to remove energy from the interior of the motor, whereby a closed motor can also be used without opening the motor. In addition, the cooling system is not only effective for cooling the motor, but also for cooling the first bearing and the second bearing effectively.

According to an advantageous embodiment, the oil circuit comprises: a first branch extending in the axial direction of the motor shaft and communicating with the first lubrication reservoir; and a second branch extending through the motor shaft in a radial direction of the motor shaft to communicate with the second lubrication reservoir and in fluid communication with the first branch. The design mode can process the motor shaft as little as possible, and a passage between the first lubricating pool and the second lubricating pool can be opened.

A further aspect of the invention provides a marine propulsion device comprising an electric motor as described in any one of the embodiments above.

It is to be noted here that the lubricating medium used in the cooling system does not refer to only a specific lubricating oil, but a lubricating oil or fluid having lubricating and cooling effects.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,

figure 1 schematically shows a cooling system of a marine propulsion device according to the invention;

fig. 2 schematically shows a part of a cooling system of a ship propulsion device according to the invention in enlarged scale.

List of reference numerals:

21 oil tank

22 heat exchanger

23 Filter

24 pump

25 oil pipe

261 first lubricating pool

262 second lubrication pool

263 first hole

264 second hole

265 third hole

28 oil circuit

281 first branch

282 second branch

30-rotation bearing disc

40 electric unit

43 Motor shaft

431 first end of the motor shaft

432 motor shaft second end

44 casing

47 electric machine

481 first bearing

482 second bearing

50 hanger structure

60 a propeller; propeller

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

Fig. 1 schematically shows an embodiment of a marine propulsion device 100 according to the invention.

The vessel propulsion device 100 is in particular a pod-type vessel propulsion device which can be connected to the vessel, in particular to the bottom of the vessel, typically by means of a slewing ring 30 or coupling ring known in the art, such that the pod-type vessel propulsion device 100 can be rotated in order to adjust the direction of travel of the vessel. The boat propulsion device 100 shown in fig. 1 includes an electric unit 40, and the electric unit 40 mainly includes an electric motor 47. The electric unit 40 comprises a housing 44 and a motor 47 enclosed by the housing 44, wherein the motor 47 comprises a stator, a rotor and a motor shaft. The rotor of the motor 47 is supported on the motor shaft 43 of the motor, and a propeller 60, which is usually a screw propeller or propeller 60, is provided at one end of the motor shaft 43. In the present invention, the area of the end of the electric unit 40 near the propeller 60 may be referred to as a proximal end area. It is not limited to the point closest to the propeller 60 but may indicate an area closer to the propeller 60 on the electric unit 40, particularly on the housing 44 thereof, than the other end. Correspondingly, the region of the electric unit 40, in particular of its housing 44, which is closer to the other end or is further away from the propeller 60 is referred to as the distal region. The boat propulsion device 100 further includes a hanger structure 50 for connecting the electric unit 40 to the slewing bearing disk 30. The hanger structure shown in fig. 2 forms an approximately triangular shape when viewed in the view of the figure.

The motor shaft 43 of the motor 47 of the boat propulsion device 100 shown in the drawings is rotatably supported by two bearings, which are a first bearing 481 and a second bearing 482, respectively. The first and second bearings 481, 482 themselves require lubrication and cooling by a lubricating medium, thereby reducing friction, wear, and noise. The invention utilizes the lubricating and cooling functions of the bearing to cool the motor.

As shown in fig. 1 in conjunction with the details of fig. 2, a first lubrication reservoir 261 is provided around the first bearing 481. The first lubrication reservoir 261 surrounds the first bearing 481 such that the first bearing 481 can be at least partially or, in a preferred case, completely immersed in the lubricating medium. The first lubrication reservoir 261 forms a closed first chamber into which the first end 431 of the motor shaft 43 of the motor 47 projects through a first bore 263 made in the wall of the first chamber and is supported on the first bearing 481. Wherein a seal is provided between the first hole 263 and the peripheral wall of the motor shaft 43. Similarly, a second lubrication reservoir 262 is provided around the second bearing 482. The second lubrication reservoir 262 surrounds the second bearing 482 such that the second bearing 482 can be at least partially submerged or, in a preferred case, completely submerged in the lubricating medium. The second lubrication reservoir 262 forms a closed second chamber, into which the second end 432 of the motor shaft 43 of the motor 47 extends through a second hole 264 and a third hole 265, which are made in the wall of the second chamber, and is supported on the second bearing 482. Wherein seals are also provided between the second and third holes 264, 265 and the peripheral wall of the motor shaft 43. The second end 432 of the motor shaft 43 extends out to be connected with the propeller 60, and is used for driving the propeller 60 to rotate, so as to provide power for the whole ship propulsion device 100.

According to an embodiment of the present invention, in order to cool the motor 47 using the lubricating medium provided in the first lubricating reservoir 261 and the second lubricating reservoir 262, a motor shaft oil passage 28 is provided in the motor shaft 43, which communicates the first lubricating reservoir 261 and the second lubricating reservoir 262. Specifically, the motor shaft oil passage 28 may include a first branch passage 281 extending in the axial direction of the motor shaft 43, which extends toward the first lubrication reservoir 261 as shown in fig. 2, and is connected to the first lubrication reservoir 261 on the end surface of the first end 431 of the motor shaft 43. In addition, the motor shaft oil passage 28 further includes a second branch 282 communicating with the first branch 281 and extending in the radial direction of the motor shaft 43 to form a through hole, which communicates with the second lubrication reservoir 262. Therefore, under the driving of the pump, the lubricating medium can flow through the motor shaft 43 to take away the heat of the motor, and the design can make full use of the good heat-conducting property of the metal material of the shaft in the shaft, so that the heat exchange efficiency is improved. In addition, the motor 47 can be closed because of the heat removal from the interior of the shaft, and an open motor approach is no longer used.

Referring to fig. 1, in order to better realize the circulation of the cooling and lubricating medium paths, the entire lubricating medium path further includes an oil tank 21, a heat exchanger 22, a filter 23 and a pump 24, which are in fluid communication with the first lubricating reservoir 261 and the second lubricating reservoir 262. As schematically shown in fig. 1, under the drive of the pump 24, the lubricating medium circulates throughout the oil passage in the direction indicated by the arrow. The lubricating medium in this embodiment enters the motor shaft 43 from the first lubricating reservoir 261 along the first branch 281, carries away the heat of the motor, and then flows to the second branch 282 to flow into the second lubricating reservoir 262 from the two openings of the second branch. The second lubrication reservoir 262 is connected to a pump 24 via a line. The pump 24 pushes the lubricating medium through the filter 23, whereby impurities and the like due to bearings and the like can be filtered out. The lubricating medium passes through the heat exchanger 22 after passing through the filter 23, and then the lubricating medium after heat dissipation is returned to the oil tank 21. The oil tank 21 communicates with the first lubrication reservoir 261. It is contemplated that this connection is merely an example and that the entire oil circuit may run in the opposite direction to that shown. The positions of the pump, the filter, the oil tank and the heat exchanger can be changed to adapt to actual conditions to obtain the most suitable effect. In the case of actual installation, a pump, a filter, an oil tank, a heat exchanger, and the like may be provided in the hull instead of the boat drive 100, whereby the internal structure of the boat drive 100 may be simplified.

As shown in fig. 2, according to a preferred embodiment, additional pumps are provided in the first lubrication reservoir 261 or/and the second lubrication reservoir 262 according to the present invention for enhancing the circulation of the entire lubrication cooling circuit.

By means of the design according to the invention, heat can be removed from the interior of the motor by means of the lubricating medium without affecting the sealing system of the motor. The oil passage 28 in the motor shaft of the motor can effectively utilize the metal material of the motor shaft, thereby improving the heat dissipation efficiency of the motor. The heat removed is carried with the lubrication medium to the heat exchanger 22 and the subsequent cryogenic oil is returned to the mail box.

On the other hand, the cooling system formed by the oil way can further help to lubricate and cool the bearing of the motor shaft and prolong the service life of the motor shaft. For example, the filter 23 may clean up impurities in the lubrication medium, thereby maintaining the quality of the lubrication medium.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.

Claims

1. Cooling system (20) for a marine propulsion device (100), wherein the marine propulsion device (100) comprises an electric motor (47), the cooling system being characterized by comprising:

a first lubrication reservoir (261) for housing a first bearing (481) supporting a motor shaft (43) of said motor (47);

a second lubrication reservoir (262) for receiving a second bearing (482) supporting the motor shaft (43); and

an oil passage (28) configured inside the motor shaft (43) and fluidly communicating the first lubrication reservoir (261) and the second lubrication reservoir (262).

2. The cooling system (20) of claim 1, wherein the oil circuit (28) comprises:

a first branch (281) extending in the axial direction of the motor shaft (43) and communicating with the first lubrication reservoir (261); and

a second branch (282) extending through the motor shaft (43) in a radial direction of the motor shaft (43) communicating with the second lubrication reservoir (262) and in fluid communication with the first branch (281).

3. The cooling system (20) of claim 1, further comprising:

a pump (24) in fluid communication with said first lubrication reservoir (261) and said second lubrication reservoir (262); and

a heat exchanger (22) disposed in the pump (24) in a direction of flow of the fluid in the cooling system.

4. The cooling system (20) of claim 3, further comprising:

a filter (23) placed in said heat exchanger (22) in the direction of flow of the fluid in said cooling system.

5. The cooling system (20) according to any one of claims 1 to 4, further comprising:

at least one additional pump arranged in the first lubrication reservoir (261) and/or the second lubrication reservoir (262).

6. An electric machine (47) comprising:

a motor shaft (43) rotatably mounted on a first bearing (481) and a second bearing (482), wherein

Said first bearing (481) being housed in a first lubrication reservoir (261),

the second bearing (482) is housed in a second lubrication reservoir (262); and wherein

An oil passage (28) is provided in the motor shaft (43) and fluidly connects the first lubrication reservoir (261) and the second lubrication reservoir (262).

7. The electric machine (47) according to claim 6, characterized in that the oil circuit (28) comprises:

8. Marine propulsion arrangement (100) comprising a cooling system (100) according to any one of claims 1 to 5.

9. Marine propulsion arrangement (100) comprising an electric machine (47) according to any one of claims 6 to 7.