JPH01240399A - Lubricant supplier for contra-rotating propeller - Google Patents

Abstract

PURPOSE:To enable oiling to be accomplished under perfectly sealed condition, in a lubricant distributor provided between the outer peripheral surface of an inner shaft fitted into a hollow outer shaft and an non-rotating cylindrical body, by disposing seal rings for forming an additional oil chamber in a position adjacent to seal rings for forming an original oil chamber. CONSTITUTION:A stern side propeller is fixed to an inner shaft 2 rotatably supported in a hollow outer shaft to which a bow side propeller is fixed, so that both shafts are driven in mutually reverse rotations. And, a lubricant distributor J is installed between the outer peripheral surface, on the driving side, of the inner shaft 2 and a fixing cylinder 30 and the lubricant supplied from a tank 36 is supplied, through a piping 35 to a sealing unit for sealing a space between both shafts at the outer end of the shaft. In the abovementioned lubricant distributor J, the sealing fixing cylinder 30 is arranged in coaxially with the inner shaft 2 and plural seal rings S1 to S4 are placed in parallel on its inner periphery so as to form oil chambers Y1 to Y3 between respective adjacent seal rings. Then the piping 35 is connected to oil chamber Y2 after setting the pressures in oil chambers Y1, Y3 higher than the pressure in the oil chamber Y2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating oil supply device for a counter-rotating propeller used mainly for ships.

[Prior Art] FIG. 3 shows an outline of a conventional counter-rotating propeller drive device for ships, and FIGS. 4 and 5 show details of its lubricating oil supply device.

As shown in FIG. 3, the counter-rotating propeller drive device has an inner shaft 2 coaxially inserted inside a hollow outer shaft 1, and an outer shaft 1.
is rotatably supported with respect to the stand frame 3 by outer shaft support bearings 4 and 5, and the inner shaft 2 is rotatably supported with respect to the outer shaft I by inner shaft support bearings 6, 7, and 8, The inner shaft 2 and the outer shaft l are engaged with each other by the reversing gears 9, 10, and II, so that the stern side propeller I2 is connected to the outboard end of the inner shaft 2. A propeller boss 13 having a bow side propeller 14 is fixed to the outboard end of the outer shaft 1, and a propeller boss 15 having a bow propeller 14 is fixed to the outboard end of the outer shaft 1. Note that the inner shaft support bearing 7 is a thrust bearing.

In this counter-rotating propeller drive device, the space between the stern frame 3 and the outer shaft 1 is sealed by being located on the bow side and the stern side, respectively, between the stern frame 3 and the outer shaft 1. A sealing device A-r3 is provided, and is located between the outer shaft l and the inner shaft 2, on the bow side and the stern side, respectively.
A sealing device C-D is provided to seal the space between the outer shaft 17 and the inner shaft 2.

The sealing device is called an outboard reversing sealing device, and consists of a propeller boss 15 fixed to the outer shaft l of the outboard and an inner shaft 2.
The propeller boss 13 is fixed to the propeller boss 13. Bearings 4 and 5 for supporting the outer shaft are located between the sealing device A and the sealing device B, and bearings 6, 7, and 8 for supporting the inner shaft are located between the sealing device C and the sealing device. Lubricating oil can be supplied to each of the bearings 4, 5, 6, 7, and 8.

To elaborate on the above-mentioned outboard reversal seal device,
As shown in FIG. 4, in this reversing seal device, a seal ring fixing tube 16 is fixed to the front end surface of the stern propeller boss 13, and a seal ring fixing cylinder 16 is fixed to the rear end surface of the bow propeller boss 15, and the outer circumference of the inner shaft 2 is fixed to the rear end surface of the bow propeller boss 15. Fix the seal liner 17 with a slight gap to the surface, insert the rear part of the seal liner 17 into the seal ring fixing tube 16, and attach it to the inner peripheral surface of the seal ring fixing tube 16 using a saw. Seal ring 18/19/
The inner circumferential edge of the seal liner 20 is slidably brought into contact with the outer circumferential surface of the seal liner 17, and the sliding contact surface is used for sealing.

In this case, three seal rings are arranged in the axial direction of the inner shaft 2 and spaced apart from each other, as shown by symbols I8, 19, and 20. An oil chamber YO is secured between the seal rings 18 and 19, and lubricating oil is supplied to this oil chamber YO.

On the other hand, the seal ring 20 is directly immersed in seawater, and a chamber 21 is secured between the seal ring 20 and the sole ring 19 on the inside of the ship, which acts as an intermediate buffer area. This is where a mixture of seawater and lubricating oil accumulates. Further, the space on the inside of the ship on the left side of the seal ring 18 in the figure is a chamber 23 that communicates with the space 22 between the inner shaft 2 and the outer shaft l.
The oil used to lubricate the inner shaft support bearings 6, 7, and 8 reaches 3.

Among the seal rings I8, I9, and 20, the seal rings 19 and 20 on the outboard liquid side have a sealing effect that increases as the pressure of the outboard liquid is greater than the pressure of the oil in the oil chamber YO. When the ship's water intake is large, the pressure on the seawater side is high, creating a seal that has a great sealing effect.

Next, the system for supplying lubricating oil to the oil chamber YO of the above-mentioned reversing seal device will be described. The oil chamber YO of the reversing seal = 4- device has an oil passage 24 formed in the seal ring fixing cylinder 16. The oil passage 24 is connected to an oil passage 25 formed inside the stern propeller boss 13,
This oil passage 25 communicates with an oil passage 27 formed in the propeller gap 26, and this oil passage 27 communicates with an oil passage 28 passing through the inside of the inner shaft 2.

On the other hand, a lubricating oil distribution device J° is provided at a predetermined position of the inner shaft 2 extending into the ship. As shown in FIG. 5, a cylindrical seal ring fixing cylinder 30 is fixed to a bearing 29 (non-rotating part) on the outer periphery of the Zunawara inner shaft 2 at a predetermined location.
A cylindrical seal liner 31 is disposed on the outer circumference of the inner shaft 2 so as to face the inner circumferential surface of the seal ring fixing cylinder 30.
are fitted. Seal rings SIO, Sll, and S are attached to the inner periphery of the seal ring fixing cylinder 30.
12 is brought into slidable contact with the outer circumferential surface of the seal liner 31 , whereby the seal ring fixing cylinder 30
, sole liner 31, seal ring 510-811-9
12 between seal rings SIO and 11 and between seal rings 11 and 12, respectively? Room 111 YIO・Y
ll is formed.

A lubricating oil supply passage 32 and a lubricating oil discharge passage 33 are connected to one oil chamber YIO from the seal ring fixed cylinder 30 side. Further, an oil passage 34 inside the seal liner 31 communicates with this oil chamber YIO, and this oil passage 34 communicates with an oil passage 28 passing through the inside of the inner shaft 2 through a passage 35.

The lubricating oil supplied from the lubricating oil supply passage 32 to the oil chamber YIO is supplied to the oil passage 34 of the seal liner 31, the piping 35,
The oil passage 28 inside the inner shaft 2 reaches the propeller cap 26 at the stern, and the oil passage 27 inside the cap 26 and the propeller post 1
2 through the internal oil passage 25 to the oil chamber YO of the reversing seal device.
is being supplied to.

Note that the lubricating oil supply passage 32 is connected to the seal ring fixing cylinder 3.
0, and the lubricating oil discharge passage 33 is connected to the upper side of the seal ring fixing cylinder 30. The other end of the lubricating oil supply passage 32 is connected to the lower part of a lubricating oil gravity tank 36 arranged at a predetermined height with respect to the inner shaft 2 and outer shaft 1, and the other end of the lubricating oil discharge passage 33 is The same lubricating oil gravity tank 36
connected to the top of the The lubricating oil is configured to naturally circulate between the tank 36 and the oil chamber YlO due to the difference in specific gravity caused by the temperature difference in the lubricating oil.

In addition, the lubricating oil supply passage 32 and the lubricating oil discharge passage 33
are provided with valves 37 and 38 for opening and closing the respective passages 32 and 33, respectively.

In addition, in the oil chamber Y11 on the other side of the lubricating oil distribution device J°,
Separate system for lubrication A11 supply passage 39 and lubricant discharge passage 4
0 is communicated, and the lubricating oil in oil chamber YIO is in oil chamber Y11.
It is classified as a lubricating oil. Note that the outside of the seal ring 910 on the other side forming the oil chamber YIO is an atmospheric space.

Next, to explain the operation of the device having the above configuration, in this device, the lubricating oil gravity tank 36 is transferred to the lubricating oil distribution device J.
' The oil supplied to the oil chamber YIO is transferred to the adjacent oil chamber Yl.
The oil flows through the oil passage 34 formed inside the seal liner 31, through the passage 35, and through the oil passage 28 provided inside the inner shaft 2 from the bow side to the stern side, while being separated from the oil in the inner shaft 2. It reaches the oil chamber YO through an oil passage 27 in the propeller cap 26, an oil passage 25 in the propeller boss 13, and an oil passage 24 in the seal ring fixing cylinder 16. The pressure within the oil chamber YO is maintained at a pressure corresponding to the height of the lubricating oil gravity tank 36.

When the water is large, the pressure from the seawater outside the boat is large, so the differential pressure between the inside and outside of the seal rings 19 and 20 of the inversion seal device becomes large, and the tightening force by the sole rings 19 and 20 becomes large, which reduces the sealing effect. increases, and no oil leakage occurs. The oil inside the oil chamber YIO of the lubricating oil distribution device J° is circulated according to the "double principle" according to the rise in temperature, and is automatically cooled as it circulates.

Next, when the ship is in a ballast state and the differential pressure between the seawater pressure and the oil in the oil chamber YO of the reversing seal device I becomes less than approximately 0.3 kg/am', the tightening force of the seal ring 19.20 decreases. Seal effectiveness is reduced. If this happens, there is a risk of lubricating oil leaking, so in order to prevent this, valves 37 and 38 are provided in the lubricating oil supply passage 32 and discharge passage 33.
Close and use the oil chamber YO of the reversing seal device in a sealed state.

When used in this way, pressure fluctuations occur due to vibrations of the inner shaft 2, etc., oil leaks from the seal rings 18 and I9, and the pressure in the oil chamber YO between the seal rings 18 and 19 decreases to -0. , resulting in a negative pressure of about 5 kg/cm'. When this happens, the pressure difference between the seawater pressure and the seawater pressure becomes large, and eventually a balance is achieved and the leakage stops.

[Problems to be Solved by the Invention] However, with such conventional technology, the following problem occurs when the At+ chamber YO of the above-mentioned inversion seal device is used in a sealed state.

That is, by closing both valves 37 and 38, the oil chamber YIO of the lubricating oil distribution device J° becomes sealed, and the cooling of the oil therein is likely to be impaired. Friction points become dry and tend to lose lubricity.

The present invention effectively solves the problems of the prior art described above. In other words, it is possible to maintain the lubricity of the necessary parts of the seal ring, reduce frictional heat generation, improve durability, and cool the lubricant Al+.

"Means for Solving the Problems" A lubricating oil supply device for a contra-rotating propeller according to the present invention has an inner shaft and an outer shaft that drive two propellers reversingly, which are coaxially combined, and a propeller side of the outer shaft. A sealing device is provided between the end portion and the outer circumferential surface of the inner shaft, and a lubricating oil distribution device is provided between the driving side outer circumferential surface of the inner shaft and the non-rotating cylindrical body around it, and the lubricating oil distributing device is provided with a sealing device. The oil chamber and the oil chamber of the sealing device are connected by piping, and an on-off valve is provided in the middle of the lubricating oil supply system connected to the lubricating oil distribution device, which is closed when the pressure in the environment around the sealing device on the propeller side decreases. In the lubricating oil supply system of a contra-rotating propeller in which a
A seal ring forming one chamber is provided, and a lubricant supply system is connected to the additional oil chamber, and a lubricant cooling means in a closed loop is connected to the oil chamber of the lubricant distribution device. It has a configuration that takes into account the current technical requirements.

[Operation] The outside of the curved chamber forming seal ring is maintained in a lubricated state by contacting the lubricating oil in the additional oil chamber, and lubricating oil is constantly supplied to the additional oil chamber. Further, the lubricating oil in the oil chamber in the lubricating oil distribution device is cooled by circulating in a closed loop between the lubricating oil and the cooling means.

[Example code] ``Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The apparatus of this embodiment differs from the apparatus shown in FIG. 3, which was previously shown as a conventional example, only in the configuration of the portion indicated by ``■'' in the same figure, and the configuration of the other portions is the same. Therefore, a description of the same parts will be omitted, and only the different parts will be described in detail with reference to FIGS. 1 and 2. Note that when referring to common parts, explanations will be made with reference to FIG. 3 or 4.

The lubricating oil distribution device J in this embodiment is constructed as shown in FIG.

Reference numeral 2 denotes an inner shaft, and a cylindrical seal ring fixing cylinder (non-rotating cylindrical body) 30 is disposed coaxially with the inner shaft 2 on the outer periphery of the inner shaft 2 . This seal ring fixing cylinder 30 rotatably supports the inner shaft 2.

It is attached to the side surface of the fixed bearing 29. Further, a cylindrical seal liner 31 is fitted and fixed to the outer circumference of the inner shaft 2 so as to face the inner circumferential surface of the sole ring fixing cylinder 30. The process up to this point is the same as the conventional device shown in FIG.

Four seal rings S1, S2, S3, and S4 are arranged in order in the axial direction of the inner shaft 2 at intervals on the inner periphery of the seal ring fixing cylinder 30. , S2 and 83, and spaces between S3 and 84 are oil chambers Y1, Y2, and Y3, respectively.

A lubricating oil supply passage 50 is connected to the middle oil chamber Y2 from the seal ring fixed cylinder 30 side, and the oil chamber Y2 is connected to the oil passage 34 in the seal liner 31, the oil passage 28 in the inner shaft 2, etc. The oil chamber Y of the reversing seal device D (see Fig. 3 and Fig. 4) is connected to the oil chamber Y of the reversing seal device D (see Fig. 3 and Fig. 4) in the same manner as the conventional device via the Ura channel that rotates together with the inner shaft 2.
It is connected to O.

Here, the seal rings 5l-82, S3, and S4 are as follows:
The pressure of the oil in each oil chamber Yl-Y3 is
The sealing effect is set to increase as the pressure outside the seal rings S1, S2, S3, and S4 that partition Y3 is higher than the pressure of the atmosphere or the oil chamber Y2.

A circulation circuit consisting of a lubricating oil supply passage 51 and a discharge passage 52 is connected to the oil chamber Y1 so that the lubricating oil circulates around the gravity tank 36, and a separate system is connected to the oil chamber Y3. A circulation circuit consisting of a supply passage 53 and a discharge passage 54 is connected. In addition, the passage 50 includes a lubricating oil supply passage 50 described in "2, which supplies lubricating oil to the oil chamber Y2".
A valve 55 is provided to open and close the lubricant, and in a separate system from the lubricant supply passage 50, the lubricant is supplied to the oil chamber Y2 as a lubricant cooling means for cooling the lubricant in the oil chamber Y2. An automatic circulation device 56 is connected.

As shown in detail in FIG. 2, this lubricating oil automatic circulation device 56 connects a sealed oil tank 57 filled with lubricating oil with air excluded and an oil chamber Y2 to a supply passage 58 and a discharge passage. It has a closed loop structure connected by 59,
The oil tank 57 is interposed in the middle of the lubricating oil supply passage 50 from the gravity tank 36 and at a position higher than the oil chamber Y2 between the valve 55 and the oil chamber Y2. A part of the lubricating oil supply passage 50 also serves as the supply passage 58 of the lubricating oil automatic circulation device 56. In addition, a sealed oil tank 57
It is designed to be cooled by cold air from the ventilation duct.

In a device with such a configuration, the seal ring S2
In the oil chamber Y2 between 83 and 83, there is an oil chamber YO for the stern side reversal seal device.
In addition, oil for another purpose (not shown) is supplied to the oil chamber Y3 between the seal rings S3 and 84. Then, the oil chambers Y2 and Y3 are sealed by the seal ring S3.
The oils are classified into 1, which are immiscible. Note that the oil pressure in the oil chamber Y3 is set higher than the pressure in the oil chamber Y2 in the normal state. Furthermore, the oil chamber Yl is supplied with lubricating oil from the gravity tank 36 at a pressure equivalent to the pressure in the oil chamber Y2 in the normal state.

If the ship is fully loaded and has deep water, and the pressure difference between the seawater pressure and the pressure inside the oil chamber YO between the seal rings of the stern side reversing seal device is large, then
Lubricating oil is supplied to O from the oil chamber Y2 and maintained at an appropriate pressure. Therefore, a large tightening force corresponding to the differential pressure is applied to the seal ring, thereby reliably preventing leakage of lubricating oil and intrusion of seawater.

On the other hand, when the ship is in a ballast state and the water is shallow, the pressure difference between the inside and outside of the seal ring of the reversing sealing device becomes small due to the decrease in seawater pressure. In that case, close the valve 57 of the supply passage 50 that supplies lubricant to the oil chamber Y2 of the lubricant distribution device J, stop the supply of lubricant to the oil chamber Y2, and seal the oil chamber Y2. .

Then, the oil chamber YO between the seal rings of the stern side reversing seal device also becomes sealed.

At this time, since the oil chamber Y2 is in a sealed state, the oil temperature in the oil chamber Y2 rises due to the frictional heat of the seal ring sliding portion that partitions the oil chamber Y2. However, since the lubricating oil small circulation circuit 56 is connected to the oil chamber Y2, the oil tank 5
As the lubricating oil circulates, it cools down. Therefore, the temperature rise of the sliding parts of the seal rings S2 and S3 is suppressed.

By the way, when the 411 chamber YO between the seal rings of the stern side reversing seal device is sealed and used, the inside of the curved chamber YO becomes negative pressure as described above, and accordingly, the Ih chamber Y
2 becomes negative pressure as well. However, in this device, the oil chamber Y
Oil chamber Y separated by seal rings S2 and S3 next to 2
1 and Y3, and these oil chambers Y1 and Y3 are supplied with lubricating oil at a higher pressure than the oil chamber Y2, so a tightening force corresponding to the differential pressure acts on the seal rings S2 and S3. This ensures high sealing performance. Therefore, oil chamber Y
1.Lubricating oil does not leak from Y3 to oil chamber Y2, and the negative pressure in oil chamber Y2 is reliably maintained. Therefore, the negative pressure in the oil chamber Y2 of the reversing seal device is also maintained, and the sealing performance is maintained.

In the lubricating oil distribution device J of the above embodiment, the seal ring fixing cylinder 30 is directly fixed to the fixed bearing 29, and since the seal ring S4 is located at the bearing 29 (till), the back surface of the seal ring S4 is The oil in the bearing 29 is sprayed onto the bearing 29 to lubricate and cool the seal ring S4.

[Effects of the Invention] As explained above, the lubricating oil supply device for a counter-rotating propeller according to the present invention provides the following effects.

(1) A seal ring for forming an additional oil chamber is disposed adjacent to a seal ring for forming an oil chamber of the lubricating oil distribution device,
Refueling can be easily and reliably performed in a sealed state.

(2) According to the above, the lubricity of the seal ring of the lubricating oil distribution device can be increased, frictional heat generation can be suppressed, and durability can be improved.

(3) A closed-loop lubricant cooling means is connected to the oil chamber of the lubricant distribution device, so lubrication and cooling can be performed smoothly in response to changes in environmental pressure while isolated from the surrounding environment. can.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of a lubricating oil supply device for a counter-rotating propeller according to the present invention, and FIG.
3 is a side sectional view of the entire conventional example of a counter-rotating propeller drive device, FIG. 4 is a detailed view of the part ■ in FIG. 3, and FIG. 5 is a section V in FIG. 3. FIG. l...Outer shaft, 2...Inner shaft, 9・IO・
11... Reversing gear, 13... Stern side propeller boss,
15... Forward side propeller pos, D... Outboard reversal seal device, 18, 19... Seal ring, Y
O...Oil chamber, 30...Seal ring fixing tube (
non-rotating cylindrical body), 81-S4...Seal ring, Y
l, Y2, Y3... Oil chamber, 50... Lubricating oil supply passage, 34... Oil passage, 28... Oil passage, 51, 53... ...Lubricating oil supply passage, 52.5
4... Lubricating oil discharge passage, 55... Valve, 56... Lubricating oil automatic circulation device (lubricating oil cooling means)
, 57... Sealed type 'A11 tank. Applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 4 Figure 5

Claims (1)

[Claims] 1. An inner shaft and an outer shaft that drive the two propellers in reverse are combined on the same axis, and a sealing device is provided between the propeller side end of the outer shaft and the outer peripheral surface of the inner shaft. , a lubricating oil distribution device is provided between the driving side outer circumferential surface of the inner shaft and the non-rotating cylindrical body around it, and the oil chamber of the lubricating oil distribution device and the oil chamber of the sealing device are connected by piping,
In a lubricating oil supply device for a counter-rotating propeller, an opening/closing valve that is closed when the pressure in the environment around the seal device on the propeller side decreases is provided in the middle of the lubricating oil supply system connected to the lubricating oil distribution device, A seal ring that surrounds the outer peripheral surface of the inner shaft to form an additional oil chamber is disposed adjacent to the oil chamber forming seal ring of the lubricant distribution device, and a lubricant supply system is connected to the additional oil chamber. Lubricating oil supply system for counter-rotating propellers. 2. The lubricating oil supply device for a counter-rotating propeller according to claim 1, wherein a lubricating oil cooling means in a closed loop state is connected to the oil chamber of the lubricating oil distribution device.