CN109494935A - The cooling system and marine propulsion of marine propulsion - Google Patents

Abstract

The present invention provides a marine propulsion device and a cooling system (20) thereof, wherein the marine propulsion device (100) comprises an electric motor (47), and the cooling system is characterized in that it comprises: a first lubricating pool (481) for accommodating a first bearing (481) supporting a motor shaft (43) of the motor (47); a second lubricating pool (482) for accommodating and supporting the motor shaft (43) ) of the second bearing (482); and an oil circuit (28), which is constructed inside the motor shaft (43) and connects the first lubrication pool (481) and the second lubrication pool ( 482) fluid communication.

Description

Cooling systems for marine propulsion and marine propulsion

technical field

The invention relates to a cooling system of a ship propulsion device and a ship propulsion device, in particular to a pod type ship propulsion device.

Background technique

Ship propulsion is a device that provides power to a ship. Marine propulsion can be divided into two categories: active and reactive. The fibers and sails (see sailboats) that drive the boat forward by manpower or wind are active; paddles, sculls, paddle wheels, water jets, propellers, etc. are reactive. Most modern transport ships use reactive propellers, and the most widely used is the propeller type. Since the motor that drives the propeller generates a lot of heat when it is running, an important way to remove this heat is to transfer the heat through the stator to the propulsion casing exposed to sea water. In a motor, the main heat-generating components are the rotor, the stator, and the terminals of the stator coils. But the full-coverage pods in the past would have a large area that could not be cooled, resulting in localized high temperatures. Usually, in order to solve the heat dissipation of the motor, a fan is provided in the casing of the propulsion device, which drives the air circulation inside the casing for cooling. One problem with this cooling method is that in order to make better use of the cooling air passing through the motor, the motor must be open to allow air to pass through, and a closed motor cannot be used.

SUMMARY OF THE INVENTION

In order to solve one or more of the above problems, the present invention aims to provide a cooling system for a marine propulsion device, wherein the marine propulsion device includes an electric motor, and the cooling system is characterized by comprising: a first lubrication pool , which is used for accommodating a first bearing supporting a motor shaft of the motor; a second lubricating pool for accommodating a second bearing supporting the motor shaft; and an oil circuit, which is constructed in the motor the interior of the shaft and fluidly communicate the first lubrication sump and the second lubrication sump. Through this design, the lubricating system of the ship's propulsion device itself can be effectively used to take energy away from the interior of the motor, so that a closed motor can also be used instead of opening the motor. In addition, the cooling system is effective not only for cooling the motor, but also for cooling the first bearing and the second bearing.

According to an advantageous embodiment, the oil circuit includes: a first branch extending along the axial direction of the motor shaft and communicating with the first lubricating pool; and a second branch extending along the axis of the motor shaft. The radial extension of the motor shaft passes through the motor shaft in communication with the second lubrication sump and in fluid communication with the first branch. In this design, the motor shaft can be processed as little as possible, and the passage between the first lubricating pool and the second lubricating pool can be opened. Since in the motor of marine propulsion, one end of the motor shaft is to extend to drive the propeller, this second branch can be used for the bearing near the end of the propeller.

According to an advantageous embodiment, the cooling system further comprises: a pump in fluid communication with the first lubricating sump and the second lubricating sump; a heat exchanger along the flow of the fluid in the cooling system direction before the pump. By providing this heat exchanger, the lubricating medium oil temperature can be cooled more efficiently.

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 can help to clean the impurities from the lubricating medium due to the bearing, which also helps to prolong the working life of the bearing.

According to an advantageous embodiment, the cooling system further comprises at least one additional pump, which is arranged in the first lubricating sump and/or the second lubricating sump. As a result, the circulation of the entire cooling system can be further enhanced.

Another aspect of the present invention provides a marine propulsion device comprising the cooling system according to any one of the above embodiments.

Another aspect of the present invention also provides a motor, comprising: a motor shaft rotatably supported on a first bearing and a second bearing, wherein the first bearing is accommodated in a first lubricating sump, the second bearing is housed in a second lubricating sump; and wherein an oil circuit is provided in the motor shaft which fluidly communicates the first and second lubricating sumps. With this design, the lubricating system of the motor can be effectively used to remove energy from the interior of the motor, so that a closed motor can also be used instead of opening the motor. In addition, the cooling system is effective not only for cooling the motor, but also for cooling the first bearing and the second bearing.

According to an advantageous embodiment, the oil circuit includes: a first branch extending along the axial direction of the motor shaft and communicating with the first lubricating pool; and a second branch extending along the axis of the motor shaft. The radial extension of the motor shaft passes through the motor shaft in communication with the second lubrication sump and in fluid communication with the first branch. In this design, the motor shaft can be processed as little as possible, and the passage between the first lubricating pool and the second lubricating pool can be opened.

Yet another aspect of the present invention provides a marine propulsion device, which includes the motor described in any one of the above embodiments.

It should be pointed out here that the lubricating medium used in the cooling system does not only refer to a specific lubricating oil, but lubricating oil or fluid with lubricating and cooling effects.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in,

Figure 1 schematically shows a cooling system for a marine propulsion device according to the present invention;

FIG. 2 schematically shows a part of a cooling system of a marine propulsion device according to the present invention on an enlarged scale.

List of reference numbers:

21 fuel tank

22 Heat Exchanger

23 Filters

24 pumps

25 tubing

261 First lubrication pool

262 Second lubrication pool

263 first hole

264 second hole

265 Third hole

28 oil circuit

281 The first branch

282 Second branch

30 Slewing bearing disc

40 Electric units

43 Motor shaft

431 Motor shaft first end

432 The second end of the motor shaft

44 shell

47 Motor

481 First bearing

482 Second bearing

50 Hanger structure

60 propeller; thruster

Detailed ways

In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings.

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

The ship propulsion device 100 is particularly a pod type ship propulsion device, which can usually be connected to a ship, especially the bottom of the ship, through a slewing bearing disk 30 or a joint ring and other components known in the art, so that the pod The ship propulsion device 100 of the type can be rotated to adjust the sailing direction of the ship. The marine propulsion device 100 shown in FIG. 1 includes an electric unit 40 , which mainly includes an electric motor 47 . The electric unit 40 includes a housing 44, and a motor 47 enclosed by the housing 44, wherein the motor 47 includes components such as 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 is provided on one end of the motor shaft 43 , which is usually a propeller or a propeller 60 . In the present invention, the area of the end of the electric unit 40 close to the propeller 60 may be called the proximal area. It is not limited to the point closest to the propeller 60 , but may indicate an area on the electric unit 40 , especially on its casing 44 , which is closer to the propeller 60 than the other end. Correspondingly, on the electric unit 40 , especially the area of the casing 44 that is closer to the other end or the area farther from the propeller 60 is called the distal area. In addition, the marine propulsion device 100 further includes a hanger structure 50 connecting the electric unit 40 and the slewing bearing plate 30 . The hanger structure shown in FIG. 2 forms an approximately triangular shape when viewed from the perspective of the drawing.

The motor shaft 43 of the motor 47 of the marine propulsion device 100 shown in the figure is rotatably supported on two bearings, which are a first bearing 481 and a second bearing 482, respectively. The first bearing 481 and the second bearing 482 themselves require a lubricating medium for lubrication and cooling, thereby reducing friction, wear and noise. The present 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 lubricating pool 261 is provided around the first bearing 481 . The first lubricating pool 261 surrounds the first bearing 481 so that the first bearing 481 can be at least partially submerged or in the preferred case completely submerged in the lubricating medium. The first lubricating pool 261 forms a closed first cavity, and the first end 431 of the motor shaft 43 of the motor 47 protrudes into the first cavity through a first hole 263 formed on the wall of the first cavity, and supported on the first bearing 481 . A seal is provided between the first hole 263 and the peripheral wall of the motor shaft 43 . Similarly, a second lubricating pool 262 is provided around the second bearing 482 . The second lubricating pool 262 surrounds the second bearing 482 so that the second bearing 482 can be at least partially or in the preferred case completely submerged in the lubricating medium. The second lubricating pool 262 forms a closed second cavity through which the second end 432 of the motor shaft 43 of the motor 47 protrudes and penetrates through a second hole 264 and a third hole 265 formed in the wall of the second cavity It passes through the second cavity and is supported on the second bearing 482 . Seals are also provided between the second hole 264 , the third hole 265 and the peripheral wall of the motor shaft 43 . The second end 432 of the motor shaft 43 extends out and is connected to the propeller 60 for driving the propeller 60 to rotate, thereby providing power for the entire marine propulsion device 100 .

According to an embodiment of the present invention, in order to use the lubricating medium provided in the first lubricating pool 261 and the second lubricating pool 262 to cool the motor 47, a motor shaft oil passage 28 is provided in the motor shaft 43, which communicates with The first lubricating pool 261 and the second lubricating pool 262. Specifically, the motor shaft oil circuit 28 may include a first branch 281 extending along the axial direction of the motor shaft 43, which extends toward the direction of the first lubricating pool 261 as shown in FIG. 2, where the motor The end face of the first end 431 of the shaft 43 is connected to the first lubricating pool 261 . In addition, the motor shaft oil passage 28 further includes a second branch passage 282 which communicates with the first branch passage 281 and extends along the radial direction of the motor shaft 43 to form a through hole, which further communicates with the second lubricating pool 262 . Therefore, under the driving of the pump, the lubricating medium can flow through the inside of the motor shaft 43 to take away the heat of the motor, and this design can make full use of the good thermal conductivity of the metal material of the shaft because it is in the shaft, and then Improve heat exchange efficiency. In addition, the motor 47 can be enclosed since the heat is removed from the inside of the shaft, instead of an open motor.

Referring to FIG. 1, in order to better realize the circulation of cooling and lubricating medium circuits, the entire lubricating medium circuit further includes an oil tank 21, a heat exchanger 22, A filter 23 and a pump 24. As schematically shown in FIG. 1 , driven by the pump 24 , the lubricating medium circulates in the entire oil circuit in the direction indicated by the arrow. In this embodiment, the lubricating medium enters the motor shaft 43 from the first lubricating pool 261 along the first branch 281, takes away the heat of the motor, and then flows to the second branch 282 from the two openings of the second branch into the second lubrication pool 262 . The second lubricating sump 262 is connected to a pump 24 via piping. 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 flows through the heat exchanger 22 through the filter 23 , and then the lubricating medium after heat dissipation returns to the oil tank 21 . The oil tank 21 communicates with the first lubrication pool 261 . It is conceivable that this connection is just an example, and the entire oil circuit can run in the opposite direction as shown. The position of the pump, filter, oil tank, heat exchanger can be changed to suit the actual situation to get the most suitable effect. In the case of actual installation, equipment such as pumps, filters, fuel tanks, heat exchangers, etc. can be arranged in the hull, but not in the ship driving device 100 , thereby simplifying the internal structure of the ship driving device 100 .

As shown in FIG. 2 , according to a preferred embodiment, an additional pump is provided in the first lubricating pool 261 or/and the second lubricating pool 262 according to the present invention to enhance the circulation of the entire lubricating and cooling oil circuit.

Through the design solution according to the present invention, the heat can be taken away from the inside of the motor by 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 entrained heat is carried along with the lubricating medium to the heat exchanger 22 and the subsequent low temperature oil is sent back to the mailbox.

On the other hand, the cooling system formed by the oil circuit can further help lubricate and cool the bearing of the motor shaft and prolong its service life. For example, the filter 23 can remove impurities from the lubricating medium, thereby maintaining the quality of the lubricating medium.

It should be understood that although this specification is described according to various embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

The above descriptions are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principles of the present invention shall fall within the protection scope of the present invention.

Claims (9)

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:

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).

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.