JP3117333B2 - Water supply to stern tube and shaft sealing / water supply device in contra-rotating propeller device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device for supplying flushing water to an inner stern side shaft sealing device and a coaxial sealing device mounted on the bow side of a stern tube in a contra-rotating propeller ship.

[0002]

2. Description of the Related Art In recent years, a contra-rotating propeller ship has been put to practical use, and its shaft system will be described with reference to FIG. 6. In FIG. 6, reference numeral 135 indicates a rear propeller. It is connected to the rear end of the inner shaft 137 and is driven by the main engine 130. On the other hand, the front propeller 134 is connected to the rear end of the outer shaft 136,
132 rotates in the opposite direction to the main engine 130. In order to protect the tooth surfaces of the reversing gear 132 from torque fluctuations of the main engine 130, the elastic joint 131
And a reversing gear 132. Inner shaft 137 is outer shaft 13
6 are supported by inner shaft bearings 142 and 145 mounted on the inner surface.

On the other hand, the weight of the outer shaft 136 is supported by outer shaft bearings 143 and 144 mounted on the hull 133. In addition, sealing devices 138, 139,
140 and 141 are installed. This sealing device 138-141
Uses a lip-type seal that is often used in conventional ships. FIG. 7 shows a stern tube shaft sealing device.
The following has been proposed. That is, in FIG. 7, reference numerals 114 and 115 indicate stern tube bearings mounted on the hull 116 for supporting the propeller shaft 113. Since the stern tube bearings 114 and 115 use lubricating oil, the lubricating oil is used. To prevent oil 117 from leaking out, stern tube bearing 11
4,115 stern tube shaft sealing devices will be installed at two locations on the bow and stern sides.

[0004] The stern tube shaft sealing device is provided on the inner periphery of casings 100 and 109 of the shaft sealing device provided at the front end and the rear end of the stern tube of the hull 116 so as to surround the outer periphery of the propeller shaft 113.
Rubber lip-type seals 101 to 104, 110, whose inner ends are in sliding contact with the outer peripheral surfaces of the liners 105, 112 of the propeller shaft 113.
It is equipped with 111, and lubricating oil is sealed between each lip type seal to lubricate the sliding part. And for many ships, the lip seals are relatively difficult to change.
Equipped with emergency piping 106.

A valve 107 is provided on a pipe 108 for draining lubricating oil which has lubricated the stern bearings 114 and 115. When the valve 107 is normally opened, the lip type seal 103 is opened. The hydraulic pressure between the lip seal 104 and the lip seal 104 becomes the same as that near the stern tube bearings 114 and 115 by the pipe 106.
3 is working. In the event of an abnormality such as wear of the lip seal 103, the pressure between the lip seals 103 and 104 is reduced by closing the valve 107, and the lip seal 104 starts functioning.

[0006]

The conventional lip seal functions by sliding between the tip of the seal lip and the outer peripheral surface of the seal liner, but has the following disadvantages. Although the sliding heat is released through the lubricating oil and seal liner inside the ship, the lubricating oil is generally sealed between the seal lips, and even in the case of the lubrication system, the amount of circulating oil is limited. No cooling effect can be expected.
The seal liner is made of a high chromium steel material having excellent corrosion resistance and abrasion resistance. However, since the heat conductivity is low, heat radiation through the seal liner is not sufficient. Viton material or the like having excellent heat resistance is used for the seal lip material. However, in consideration of abrasion resistance, that is, durability, mere change of the material is not always a sufficient measure. A small amount of the lubricating oil naturally flows out of the ship because the lubricating oil is sealed or circulated in a small amount between the seal lips, which is not preferable from the viewpoint of preventing marine pollution.

[0007] As one measure for solving such a drawback, adoption of an end face type seal can be considered. This end type seal can be easily applied to a normal single-screw ship.
When used as an inner shaft seal of a contra-rotating propeller ship, a water supply device for supplying flushing water is required, and this water supply device and piping method have unsolved problems. SUMMARY OF THE INVENTION The present invention is directed to solving the above-mentioned unsolved problems, and in a case where an end face seal is employed for an inner shaft seal of a contra-rotating propeller ship, a novel method for supplying flushing water to the end face type seal is provided. It is intended to provide a water supply device.

[0008]

In order to achieve the above object, a water supply device for a stern tube in a contra-rotating propeller device according to claim 1 of the present invention is a contra-rotating propeller device, wherein An outer shaft to which a front propeller is attached and which is rotatably attached to the hull; a front outer shaft bearing and a rear outer shaft bearing which are attached to the hull to rotatably support the outer shaft; An inner shaft mounted with a rear propeller and rotatably disposed inside the outer shaft; a front inner shaft bearing and a rear inner shaft mounted inside the outer shaft to rotatably support the inner shaft; A rear inner shaft sealing device is provided behind the rear inner shaft bearing, and the rear inner shaft sealing device is attached to a boss portion of the front propeller so as to surround the inner shaft. A seal liner attached to the inner shaft and disposed inside the seal casing, having a substantially L-shaped cross-sectional shape, and sliding on a vertical sliding surface of the seal casing on a vertical surface thereof; sliding surface of the inner and outer and 2 equipped with a pressure chamber formed between them
The end face type seals are attached to the seal liner in the horizontal plane and are disposed in the front-rear direction, and a water pipe for supplying flushing water to the pressure chamber of each end face type seal is disposed inside the outer shaft. And a drain pipe for the flushing water is disposed inside the outer shaft , and
Adjust the flushing water flow to the pressure chamber of the end face seal
Flow regulating device is provided, and the flow regulating device
Adjust the position of the end face type seal on the bow side during normal operation.
Supplying flushing water to the power chamber for operation,
Non-operation without water flow through the pressure chamber of the stern end face seal
On the other hand, if the end face seal on the bow side is abnormal,
Do not pass flushing water through the pressure chamber of the end face seal
Or a small amount of water to deactivate and
Operates by supplying flushing water to the pressure chamber of the end face seal
It is characterized by having

Further, shaft seal-water supply device of the stern tube in the contra-rotating propeller apparatus according to claim 2, in the water supply device of the stern tube in the contra-rotating propeller apparatus according to claim 1, said front outer Front outer shaft sealing device in front of shaft bearing
The front outer shaft sealing device is provided with a seal casing having a rear end face attached to the hull and a seal liner disposed inside the seal casing and fitted to the outer peripheral surface of the outer shaft. An end face type seal having a substantially L-shaped cross-sectional shape that performs a sealing function in cooperation with a water supply chamber is formed inside the seal casing, and the supply pipe for the flushing water penetrates the seal casing. The water supply pipe is attached so as to open to the water supply chamber, while the water pipe is attached so that the base end thereof opens to the water supply chamber, and a water supply apparatus is provided in addition to the front outer shaft sealing device.
It is characterized by being.

[0010]

In the above-described counter-rotating propeller apparatus of the present invention, the stern tube water supply and shaft sealing / water supply apparatus surely supplies and discharges flushing water to the end face type seal. By performing the following operation,
The two end face seals of the shaft seal device can be switched and used.
Therefore, the reliability of the sealing device is greatly improved. Normal
Flushing water into the pressure chamber of the end face seal on the bow side
Supply to make this end face seal work. Meanwhile, the stern side
Water does not flow through the end face seal of the
The flushing water that has cooled the cooling
The same seal by flowing from inside the sliding surface of the
Are in a free state. This allows the spare seat
Can be used as In the event of an abnormality in the end face type seal on the bow side
Does not pass water or only a small amount of water passes through this seal. on the other hand,
Supply flushing water to the pressure chamber of the stern end face seal
Then, the end face type seal starts to function. This
In this way, you can use two end face type seals properly,
Greatly improves the practicality and reliability of the rear inner shaft sealing device
Can be In addition, water is supplied to the front outer shaft sealing device.
By that features a device, it can be effectively use of space.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a stern tube water supply and shaft sealing / water supply device in a contra-rotating propeller device according to an embodiment of the present invention.
2, FIG. 2 is an enlarged view of a portion viewed in the direction of arrow A in FIG. 1, and FIG.
FIG. 4 is an enlarged view of a section cut along arrow B of FIG.
FIG. 5 is an enlarged view of a portion viewed from an arrow D in FIG. 4.

In FIG. 1, reference numeral 3 denotes a rear propeller, and the rear propeller 3 is attached to a rear end of an inner shaft 1 connected to a main engine (not shown). On the other hand, a front propeller 4 is attached to the rear end of the outer shaft 2 connected to a reversing gear (not shown), so that the two propellers 3 and 4 are driven to reverse each other. The weight of the inner shaft 1 is supported by a front inner shaft bearing 6 mounted on the inner surface of the outer shaft 2 and a rear inner shaft bearing 7 mounted inside the boss of the front propeller 4. The hull 5 is supported by front and rear outer shaft bearings 8 and 9.

[0013] To the lubricating oil supplied to the bearings 6-9 is prevented from you spill overboard and inboard, front and rear inner shaft seal device 10, 11 and front and rear outer shaft sealing device The lubricating oil is provided to a lubricating oil tank (not shown) through an oil drain pipe 16. As shown in FIG. 2, a casing 11a is attached to the rear end face of the front propeller 4, and a part of the rear inner shaft sealing device 11 is formed in a seal liner 11f attached to the inner shaft 1 inside the casing 11a. Two end face seals
11b and 11c are attached, and the front end face type seal 11c is provided.
Drainage 19 for discharging the water passage 17 for supplying flushing water F _1, a water passage 18 for supplying flushing water F ₂ rearward end face seal 11b, and drain from the rear seal unit 11 to the bets have been laid along the inner peripheral surface of the outer shaft 2.

The water passages 17 and 18 and the drainage passage 19 are connected to a water supply device 22 mounted on the outer peripheral surface of the outer shaft 2 in front of the front outer shaft seal 12. Also, in the modification shown in FIG.
The front outer shaft sealing device 15 has a water supply device 22
The front outer shaft sealing device 15 is used for the front outer shaft bearing 8.
In front of the outer shaft 2.

Next, the specific structure of the rear inner shaft sealing device 11 will be described with reference to FIG. A seal liner 11f is mounted on the outer peripheral surface of the inner shaft 1. The seal casing 11a is mounted on the rear end face of the propeller boss of the front propeller 4, and lip-type seals 11d and 11e are provided on the inner peripheral surface of the seal casing 11a.
In addition, two end face type seals 11b and 11c each having a substantially L-shaped cross section are fixed to the outer peripheral surface of the seal liner 11f, and are disposed in the front-rear direction with their horizontal surfaces fixed. A seal casing 11a is provided on a vertical surface of each end face type seal 11b, 11c.
And inner and outer sliding surfaces slidably in contact with the vertical sliding surfaces 11l and 11m, and pressure chambers 11h and 11j formed therebetween.

The flushing water F ₁ , F ₂ is supplied to each of the water passages 1
The vertical sliding surfaces 111, 11 of the seal casing 11a are formed on the vertical surfaces of the end face type seals 11b, 11c via 7, 18 respectively.
The pressure is supplied to pressure chambers 11h and 11j which open to m. When flushing water is supplied to the pressure chambers 11h and 11j of the end face type seal, the inner sliding surface is pressed against the sliding surfaces 11l and 11m of the seal casing 11a to perform a sealing action. The kinetic heat is discharged into the sea by the flushing water.

Further, a water supply device for the end face type seal is described.
Will be explained. In FIG. 3, an end face type seal is
22b, 22c, 22d, 22e. Hull
Both ends of seal casing 22a fixed to (not shown)
, A check ring 22f is attached.

The flushing water F _1, F ₂ from the outside of the seal casing 22a, is supplied to the sealed casing 22a in through the flow control device 21, 24. Then, waterway 17,
It is led through 18 to the rear inner shaft sealing device 11. On the other hand, the drain D from the inner shaft sealing device 11 is guided to the section where the water supply device 22 is located by the drainage channel 19,
It is discharged together with the drain of the drain pipe 20 for collecting the leakage water of 22b to 22e.

Further, a modified example will be described with reference to FIG. 4 and FIG . On the outer peripheral surface of the outer shaft 2, a front outer shaft sealing device
15 Shirurai Na 15h which forms a part is fitted in the outer peripheral surface of the <br/> Shirurai Na 15h, before outer shaft sealing device 15
The end face type seals 15b to 15e constituting a part are mounted.

[0020] Shirukeshin grayed 15a (which is also before outsiders axis
Rear end surface of which is part) of Lumpur apparatus 15 is mounted to the hull 5, the check ring 15f is mounted to the front end face. Further, the inner peripheral surface of the seal casing 15a has a vertical sliding surface for each end face type seal. In addition, a lip seal 15 is provided on the inner peripheral surface on the stern side, that is, in front of the front outer shaft bearing 8.
g is equipped. And flushing water F ₁ , F ₂
Supply pipe 17a of, 18a is open to the interior of the water supply chambers 25, 26 through the seal casing 15a, whereas the water passage 17, 18 is also open to the water supply chamber 25, the flushing water F _1, F ₂ Supply is available. This allows the front outer shaft seal
The water supply device 22 is provided in addition to the water supply device 15 . The other structure is substantially the same as that of FIG.

Here, the two end face type seals 11b and 11c are arranged in the front-rear direction, and their own water passages 18 and 17 are communicated with the pressure chambers 11h and 11j for the following reasons. . That is, by performing the following operation, the two end face type seals are switched and used to greatly improve the reliability of the seal device itself. Normally, by supplying flushing water to the pressure chamber 11j of bow-side end face seal 11c to function this end face type seal 11c. On the other hand, water does not flow through the stern side end face seal 11b, and the flushing water that has cooled the bow side end face type seal 11c flows from inside the sliding surface inside the stern side end face seal 11b.
Both sliding surfaces of the end face type seal 11b are free.
This can be used as a spare seal. When the end face type seal 11c on the bow side is abnormal, no water or a small amount of water flows through this seal. On the other hand, by supplying the flushing water to the pressure chamber 11h of aft end face seal 11b, the end face seal 11b begin to function.

In this manner, the two end face type seals can be selectively used, so that the practicality and reliability of the seal device can be greatly improved. Reference numerals 25a, 25b, 24a, and 24b in FIGS. 2, 3, and 5 each denote a garter spring that presses the horizontal surface of each end face type seal against the seal liner.

[0023]

As described in detail above, the following effects and advantages are obtained by the water supply and shaft sealing / water supply system for the stern tube in the contra-rotating propeller device of the present invention. (1) The sealing by the rear inner shaft sealing device can be reliably performed, and the sliding heat accompanying the sealing action can be discharged into the sea by flushing water, so that the durability of the end face type seal can be improved. (2) Since the water pipe for supplying flushing water to the pressure chamber of the end face type seal is disposed inside the outer shaft, the flushing water can be reliably supplied with a simple structure. (3) The rear inner shaft sealing device is provided with two end face type seals at the front.
It is arranged rearward and the pressure of each end face type seal is
By adjusting the flushing water supplied to the power chamber,
With a simple structure, you can use two end face seals properly
Thus, the practicality and reliability of the shaft sealing device are greatly improved. (4) By adding a water supply device to the front outer shaft sealing device , the space can be effectively used, and this is particularly advantageous when there is a space limitation in the length direction of the shaft system device.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stern tube water supply and shaft sealing / water supply device in a contra-rotating propeller device according to an embodiment of the present invention .

FIG. 2 is an enlarged view of a part viewed from an arrow A in FIG. 1;

FIG. 3 is an enlarged view of a portion viewed from an arrow B in FIG. 1;

FIG. 4 is a sectional view of a modification.

FIG. 5 is an enlarged view of a part viewed from an arrow D in FIG. 4;

FIG. 6 is a cross-sectional view of an example of a conventional shaft system device of a contra-rotating propeller ship.

FIG. 7 is a sectional view of a conventional stern tube shaft sealing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 inner shaft 2 outer shaft 3 rear propeller 4 front propeller 5 hull 6 front inner shaft bearing 7 rear inner shaft bearing 8 front outer shaft bearing 9 rear outer shaft bearing 10 front inner shaft sealing device 11 rear inner shaft sealing device 11a seal casing 11b, 11c End face type seal 11d, 11e Lip type seal 11f Seal liner 12 Front outer shaft seal device 13 Rear outer shaft seal device 22 Water supply device 15 Front outer shaft seal device 15a Seal casing 15b, 15c, 15d, 15e End face type Seal 15h Seal liner 17 Water passage 19 Drainage 21,24 Flow control device 25,26 Water supply room

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunio Saki 5-717-1, Fukahori-cho, Nagasaki-shi Mitsubishi Heavy Industries, Ltd. Nagasaki Research Laboratory (72) Inventor Kiyoshi Uchiyama 1500 Katayanagi, Oaza, Sakado-shi, Saitama Eagle Industry Co., Ltd. (72) Inventor Masami Akatsu 1500, Katayanagi, Oaza, Sakado City, Saitama Pref. Eggle Industry Co., Ltd. (56) References JP-A-53-87494 (JP, A) Jpn. U) Japanese Utility Model Showa 61-94698 (JP, U) Japanese Utility Model Showa 48-48042 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B63H 23/36 B63H 5/10

Claims (2)

(57) [Claims] In a contra-rotating propeller device, a front propeller is attached to a rear end of the contra-rotating propeller device, and an outer shaft rotatably mounted on the hull, and the outer shaft is mounted on the hull to rotatably support the outer shaft. A front outer shaft bearing and a rear outer shaft bearing, and a rear propeller attached to a rear end and an inner shaft rotatably disposed inside the outer shaft,
A front inner shaft bearing and a rear inner shaft bearing mounted inside the outer shaft to rotatably support the inner shaft; a rear inner shaft sealing device is disposed behind the rear inner shaft bearing; The rear inner shaft sealing device includes a seal casing attached to a boss portion of the front propeller so as to surround the inner shaft, and a seal liner attached to the inner shaft and disposed inside the seal casing. And two inner and outer sliding surfaces which have a substantially L-shaped cross-sectional shape and slide on the vertical sliding surface of the seal casing on the vertical surface thereof, and pressure chambers formed therebetween . An end face seal is attached to the seal liner in its horizontal plane.
A water pipe for supplying flushing water to the pressure chamber of each of the end face type seals is disposed inside the outer shaft, and a drainage pipe for the flushing water is provided for the outer shaft. Each of the end face type
Flow control to adjust the flow rate of flushing water to the pressure chamber
Control device is provided, and the flow control device is adjusted to
Supply flushing water to the pressure chamber of the end face seal on the neck side.
And the pressure chamber of the stern end face seal
The water is not allowed to flow through the head, and it is not operated.
In the event of an abnormality in the
Non-operating with no flushing water or small amount of water
At the same time, flush the pressure chamber of the end face seal on the stern side.
Characterized in that it operates by supplying sing water ,
Stern tube water supply device in contra-rotating propeller device. 2. The water supply device for a stern tube in the contra-rotating propeller device according to claim 1, wherein the front outer shaft bearing is provided.
A front outer shaft sealing device is provided in front of the
Lumpur apparatus, a seal casing which is attached to the rear end face to said hull, and a sealing liner being disposed inside the same sealing casing is fitted to the outer peripheral surface of the outer shaft, in cooperation with the sealing liner An end-face seal having a substantially L-shaped cross-sectional shape that performs a sealing function. A water supply chamber is formed inside the seal casing, and a supply pipe for the flushing water passes through the seal casing and is connected to the water supply chamber. while mounted so as to open, the water passage tube and the base end portion mounted to open to the water feed chamber, wherein
A shaft sealing and water supply device for a stern tube in a contra-rotating propeller device, wherein a water supply device is provided in addition to a front outer shaft seal device.