JPH11118043A - Stern tube sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the penetration of a fishing net drifting in the seawater and muddy sand into this sealing device by installing a fishing net penetration preventing ring with an end seal, using one side face as a fishing net stopping wall, and the other side face as an end seal extending aslant toward the outer diametral direction, in a stern tube sealing device at the rear of a ship. SOLUTION: A fishing net penetration preventing 1 with an end seal to be assembled in a rear stern tube sealing device is locked to a liner by a garter spring 6 installed in the central part, and there is a fin 5 at the inner diameter side of a fishing net stopper 4 of on side face, and sliding width limiting projections 3 are installed in the other side face at regular intervals. Since this end sealed fishing net penetration preventing ring 1 is surrounded by a ring chamber made up by a casing at the stern side of a seal ring, an end seal 2 surely functions even if there is a shaft movement in time of outfitting or navigation. With this, the fishing net in the seawater is prevented by the fishing net stopper 4 and the fin 5 and muddy sand in rivers is also prevented from its penetration into the sealing device by the end seal 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stern tube sealing device for a ship.

[0002]

2. Description of the Related Art A conventional muddy water intrusion prevention type stern tube sealing device is shown in FIGS. In the example shown in FIG. 5, a plate-shaped blocking plate 23 made of rubber or elastomer is provided on the seawater side of the rearmost seal ring 10 of the stern tube sealing device 9 with a casing 24.
It is attached by. In FIG. 6, another additional seal ring 25 is attached to the seawater side of the rearmost seal ring 10 by a casing 26. Further, an annular chamber 27 between the rearmost seal ring 10 and the additional seal ring 25
The fresh water is supplied from the inside of the ship via a pipe 21 and is discharged out of the ship from between the additional seal ring 25 and the liner. In FIG. 7, an end face seal 28 is arranged on the seawater side of the rearmost seal ring 10 so as to slide on a casing 29 to which the rearmost seal ring 10 is fixed. These all have the purpose of preventing foreign substances such as mud and sand outside the boat from entering the inside of the sealing device 9.

[0003]

However, these methods have the following disadvantages. In the case of FIGS. 5 and 6,
It is inevitable that the liner 18 will be worn by the muddy sand and the seal ring 25 and the seal ring 25. Therefore,
Even if the time for muddy water to enter the stern tube sealing device 9 and the time for oil leakage of the stern tube oil 22 outboard can be extended, the expensive liner 1
8 must be replaced within a shorter period of time than normal use due to wear. Although the end face seal 28 is used in the method of FIG. 7, the wear of the liner 18 can be avoided. However, since the end face seal 28 is free to move in the axial direction, its mounting position is determined by the movement of the shaft during outfitting and navigation. May deviate from the proper position and stop functioning. further,
Since the end face seal 28 is not protected by the casing, when the fishing net is wound on the liner 18, it may be easily damaged. A rear stern tube sealing device 9 equipped with a fishing net intrusion prevention ring 1 with an end face seal capable of compensating for these drawbacks and reducing wear of the liner 18 and preventing damage to the seal ring due to the fishing net or the like is provided.

[0004]

According to the present invention, a substantially concave annular body made of rubber or a polymer material is fixed to a liner by a garter spring attached to the center of the annular body.
One side is a fishing net stop wall, and the other side is equipped with a fishing net intrusion prevention ring with an end face seal provided with a thin plate-shaped end face seal that extends obliquely toward the outer diameter in the rear stern tube seal device of the ship Things.

[0005]

By installing a fishing net intrusion prevention ring with an end face seal on the seawater side of the rear stern tube sealing device, the fishing net is prevented from entering the sealing device by the fishing net stopping wall on the seawater side of the ring. Further, water containing mud and sand can be prevented from entering the sealing device by the end face seal on the inner side of the ring.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Figure 1 shows a fishing net intrusion prevention ring 1 with an end face seal
In a substantially concave annular body made of rubber or a polymer material, the annular body is fixed to a liner 18 by a garter spring 6 attached to the center of the annular body. Has a fin 5 inclined slightly downward, and the other side surface is slid so that the thin end seal 2 and the sliding portion of the end seal extending obliquely in the outer diameter direction do not contact the entire surface. Protrusion 3 for limiting moving width
Are provided at equal intervals.

FIG. 2 shows a rear stern tube sealing device 9 in which the fishing net intrusion prevention ring 1 with the end face seal of FIG. Reference numerals 10, 11, and 12 denote seal rings that slide on a liner 18 mounted on a propeller shaft 19, and these are held by a casing member 13 of a rear stern tube sealing device 9 fixed to a hull stern member 20. The seal rings 10 and 11 are arranged on the stern side toward the seawater side and perform an action of sealing seawater. Further, the seal ring 12 is arranged toward the inside of the ship, and the stern tube lubricating oil 22
Performs the action of sealing. In this embodiment, the fishing net intrusion prevention ring 1 with the end face seal shown in the embodiment of FIG.
5, the end face seal 2 functions reliably even when the shaft is moved during outfitting or navigation. Further, the sliding width of the end face seal 2 is restricted by the protrusions 3 provided at equal intervals so that the end face seal 2 comes into sliding contact with the casing 14 so that the seal portion does not contact the entire surface. The fishing nets in the seawater are blocked by the fishing net stoppers 4 and the fins 5, and the mud and sand in the river is prevented from entering the sealing device 9 by the end face seal 2.

FIG. 3 shows a fishing net intrusion prevention ring 1 with an end face seal.
This is another embodiment of the rear stern tube sealing device 9 equipped with a pipe 21 for supplying a fluid from the inside of the ship to the embodiment of FIG. The fluid is discharged to the outside of the boat through a sliding portion between the end face seal 2 provided in the annular chamber 16 and the casing 14 to protect the sliding portion from being worn.

[0009]

By equipping the rear stern tube sealing device with the fishing net intrusion prevention ring with the end face seal of the present invention, the fishing net drifting underwater (seawater) can be prevented by the fishing net stopper and the fin, and the mud sand can be prevented. Can be prevented from entering the sealing device by the end face seal inside the ship. In particular, the effect of preventing the intrusion of mud and sand by the end face seal significantly reduces damage to the liner and the seal ring, and can extend the life of expensive liners and seal rings. Also, since the casing for the rearmost seal ring is a two-piece product, even if it is worn, it can be easily replaced without the need to remove the shaft, as in the case of the fishing net intrusion prevention ring with end face seal. You don't have to. still,
It goes without saying that the present invention can be applied not only to a stern tube sealing device but also to various shaft sealing devices such as a thruster sealing device for sealing seawater or river water outside a ship.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing an embodiment of a fishing net intrusion prevention ring with an end face seal according to the present invention.

FIG. 2 is a half sectional view showing an embodiment in which a fishing net intrusion prevention ring with an end face seal according to FIG. 1 of the present invention is mounted on a rear stern tube sealing device.

FIG. 3 is a half sectional view showing another embodiment in which the fishing net intrusion prevention ring with an end face seal is attached to the rear stern tube sealing device according to FIG. 1 of the present invention.

FIG. 4 is a half sectional view showing a conventional fishing net intrusion prevention ring.

FIG. 5 is a half sectional view showing a conventional muddy water intrusion prevention type rear stern tube sealing device.

FIG. 6 is a half sectional view showing a conventional muddy water intrusion prevention type rear stern tube sealing device.

FIG. 7 is a half sectional view showing a conventional muddy water intrusion prevention type rear stern tube sealing device.

[Explanation of symbols]

1 Fishing Net Intrusion Prevention Ring with End Seal 2 End Seal 3 Projection 4 Fishing Net Stop (Seawater Side) 5 Fin 6 Garter Spring 7 Fishing Net Intrusion Prevention Ring 8 Fishing Net Stop (Inboard) 9 Rear Stern Tube Sealing Device 10 Last Seal Ring (# 1) 11 Seal ring (# 2) 12 Seal ring (# 3) 13 Seal casing 14 Casing (for the last seal ring) 15 Casing (for a fishing net with an end face sealing prevention ring) 16 Annular chamber (with a fishing net with an end face seal prevention) 17 Between annular ring 1 and seal ring 10 17 Annular chamber (between casings 14 and 15) 18 Liner 19 Propeller shaft 20 Hull stern member 21 Piping 22 Stern tube lubricating oil 23 Plate-shaped blocking plate 24 Casing (for plate-shaped blocking plate 23) 25 Additional seal ring 26 Casing (for additional seal ring 25) 27 Annular (During additional sealing ring 25 and the seal ring 10) 28 face seal 29 casing (for face seal 28)

Claims (4)

[Claims] 1. A substantially concave annular body fixed to a shaft or a liner outer periphery by a garter spring, wherein one side surface is a fishing net stopping wall, and the other side surface is a thin plate extending obliquely toward an outer diameter direction. A stern tube seal device comprising a fishing net intrusion prevention ring with a rubber or polymer material end face seal provided with an end face seal. 2. A stern tube seal device comprising the fishing net intrusion prevention ring with end face seal according to claim 1, wherein a projection for limiting a sliding width is provided so that the end seal sliding portion does not hit the entire surface. . 3. A rear stern tube sealing device for a ship, wherein an annular chamber is provided on the seawater side of the rearmost seal ring, and the annular chamber surrounds the fishing net intrusion prevention ring with end face seal according to claim 1 or 2. A stern tube sealing device. 4. A pipe for supplying fluid from inside the ship is provided in an annular chamber between the fishing net intrusion prevention ring with the end face seal and the rearmost seal ring, and the fluid is outboard through the end face sliding contact portion of the fishing net intrusion prevention ring with the end face seal. 4. The stern tube sealing device according to claim 3, wherein the stern tube is discharged to the stern tube.