JPH06344984A - Bulkhead sealing device for ship - Google Patents

Abstract

PURPOSE:To provide a device for supplying compressed gas from a compressed gas supply device into an elastic seal to automatically operate a seal and to seal water in a bulkhead sealing device for a ship having the elastic seal normally under the non-contact condition by detecting the invasion of sea water. CONSTITUTION:Casing members 3, 4 provided with excess deformation preventing projections 12 and an elastic seal 11 held on the inner periphery of the casing members are mounted on a bulkhead 9, and a float 14, valve 15, pressure regulating valve 16 and compressed gas source 17 are connected by a connecting pipe 18 to constitute a bulkhead sealing device for a ship.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partition wall sealing device for ships.

[0002]

2. Description of the Related Art A conventional partition wall sealing device for ships is shown in FIG. This is composed of casing members 3, 4, 5 on the partition wall 9, lip type oil seals 6, 7 held on the inner periphery thereof, a liner 1 externally fixed to the propeller shaft 10, an O-ring 8, and a clamp ring 2. It is a configured partition sealing device. The oil seals 6, 7 are always in sliding contact with the liner 1, and the space between the oil seals 6, 7 is filled with a lubricant such as oil or grease from the outside to prevent wear and seizure of the oil seals. is doing.

[0003]

In FIG. 5, the conventional ship bulkhead sealing device has the following drawbacks. Since the oil seals 6 and 7 are always in sliding contact with the liner,
Even when there is no intrusion of seawater and the sealing function is not required, the oil seal is under load, and there is a risk that the performance may be compromised and it may not function in an emergency. Therefore, it is an object of the present invention to provide a partition wall sealing device for a ship which normally maintains a non-contact state and automatically exhibits a sealing function only when seawater enters.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has an elastic seal attached to a casing which is normally held in a non-contact state. The elastic seal is automatically activated by detecting seawater and supplying compressed gas into the elastic seal. In addition, the compressed gas is not shared with other uses, but is dedicated for the partition wall seal, and the float detects the intrusion of seawater by the float and supplies power for operating the valve for supplying the compressed gas. A buoyancy force is applied from seawater, and a protrusion is provided on the sliding contact portion of the elastic body seal to hold a lubricant and prevent excessive deformation. A liquid level detector may be used as another means for detecting the intrusion of seawater.

[0005]

The elastic seal is normally kept in non-contact with the rotary shaft. When seawater intrusion occurs, the force received from seawater,
For example, due to the buoyancy force that the float receives from seawater, the original valve of the compressed gas source is automatically opened before the seawater surface reaches the lower end of the rotating shaft, whereby compressed gas is supplied to the elastic body seal, and the elastic body seal is Performs a sealing function by sliding contact with the rotating shaft. Further, a lubricant is held in the sliding contact portion on the inner peripheral side of the elastic body seal to prevent abrasion and seizure, and to hold the elastic body seal in order to prevent excessive deformation of the elastic body seal. The casing has a protrusion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
And FIG. 3 will be described. In the first embodiment of the partition wall sealing device for a ship shown in FIG. 1, the partition wall 9 has casing members 3, 4 and a rubber elastic body seal 1 held on the inner periphery thereof.
1, projection 12 for preventing excessive deformation, float 14, valve 15, pressure regulating valve 16, compressed gas source 17, connection pipe 1
A partition wall sealing device for vessels constituted by 8 is provided.
The elastic body seal 11 has a seal lip 11a, and a lubricant 13 for preventing seizure is held on an inner peripheral portion of the seal lip 11a. The lip seal 11a is a rotary shaft 1 such as an intermediate shaft.
There is a gap for 0. FIG. 2 shows the arrangement of the compressed gas supply device, and the float 14 is arranged at a position lower than the lower end of the rotary shaft 10. FIG. 3 shows a second embodiment of the partition wall sealing device for a ship, showing another method of seawater detecting means in the compressed gas supply device, in which the float 14 is equipped with a liquid level detector 19. FIG. 4 shows an operation state of the partition wall sealing device for a ship at the time of intrusion of seawater, in which the elastic body seal 11 swells due to the inflow of compressed gas and the lip seal 11a comes into sliding contact with the rotary shaft 10. There is. Since the elastic body seal 11 contacts the excessive deformation preventing projection 12 and is not further deformed, an excessive tightening margin is not given to the rotary shaft 10 with which the seal lip 11a is in sliding contact. Further, when the seal lip 11a is brought into sliding contact with the rotating shaft 10 and generates heat, the lubricant 13 held on the inner peripheral side of the seal lip 11a is warmed and flows to perform a lubricating action, resulting in wear and seizure of the seal lip 11a. Prevent. Separately from the compressed gas source used by the ship, an independent compressed gas source 17 is arranged in the vicinity of the partition sealing device, and the valve 15 is operated by the float 14 to provide the inboard compressed gas for the partition sealing device. The piping from the source is not required, and the electric wiring for controlling the valve 15 is not required, so that it can be easily installed from the viewpoint of construction. The present invention has the above-described structure, and when seawater enters the shaft chamber, buoyancy acts on the float 14 to open the valve 15 and compress the elastic body seal 11 before the seawater surface reaches the lower end of the rotating shaft 10. A compressed gas is supplied from the gas source 17.
Further, the pressure adjusting valve 16 adjusts the pressure so as to provide the most appropriate tightening margin when the elastic body seal 11 is deformed and the seal lip 11a is in sliding contact with the rotary shaft 10.

[0007]

[Effect of the Invention] Since the partition wall sealing device for a ship according to the present invention normally maintains the non-contact state with the rotating shaft when the sealing function is not required, the seawater invades and the seawater surface reaches the lower end of the rotating shaft. There is no deterioration of the sealing function and maintenance is not required until the sealing function is exerted immediately before reaching. Further, since the elastic body seal does not normally make sliding contact with the rotary shaft, the liner used in the conventional partition wall seal device can be omitted. Furthermore, an independent compressed gas source is installed in the vicinity of the bulkhead seal device in addition to the compressed gas source used by the ship, and the valve operation is performed by the float or liquid level detector, so that the inboard compression for the bulkhead seal device is performed. Since the piping from the gas source is unnecessary and the electric wiring for controlling the valve can be omitted, it can be easily installed in the partition.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a partition wall seal device according to a first embodiment of the present invention.

FIG. 2 is a layout view of a compressed gas supply device.

FIG. 3 is a second embodiment of a partition wall sealing device for a ship, and is a diagram of a compressed gas supply device using a liquid level detector.

FIG. 4 is a cross-sectional view showing a state during operation in the first embodiment of the partition wall sealing device for a ship.

FIG. 5 is a half-cut sectional view showing a conventional partition wall sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liner 2 Fixed ring 3 Casing member 4 Casing member 5 Casing member 6 Oil seal 7 Oil seal 8 O-ring 9 Partition wall 10 Rotating shaft 11 Elastic body seal 11a Seal lip 12 Excessive deformation prevention protrusion 13 Lubricant 14 Float 15 Valve 16 Pressure regulating valve 17 Compressed gas source 18 Connection pipe 19 Liquid level detector

Claims (6)

[Claims] 1. In a partition wall seal device mounted between a partition wall for partitioning each chamber of a ship and a rotary shaft penetrating the partition wall, an elastic body seal mounted on a casing is normally in non-contact with the rotary shaft. The elastic body seal is held and is automatically activated by detecting the seawater and releasing a compressed gas into the elastic body seal in an emergency when seawater enters the room defined by the partition wall. A partition sealing device characterized by the above. 2. The partition seal device of claim 1, wherein the compressed gas source is dedicated for the partition seal device without being shared with other applications. 3. Infiltration of seawater is detected by a float,
2. The partition wall seal device according to claim 1, wherein the power for operating the valve for releasing the compressed gas is buoyancy received by the float from seawater. 4. The partition wall seal device according to claim 1, wherein the intrusion of seawater is detected by a liquid level detector to release the compressed gas. 5. The partition wall seal device according to claim 1, wherein a lubricant is held at a sliding contact portion of the elastic body seal. 6. A casing holding an elastic body seal,
The partition sealing device according to claim 1, further comprising a protrusion for preventing the elastic seal from excessive deformation.