Pneumatic sealing ring capable of allowing stern shaft to rotate

Abstract

The invention relates to a ship stern shaft sealing device, in particular to an improvement to a sealing air bag in a pneumatic sealing device. A pneumatic sealing ring capable of allowing a stern shaft to rotate comprises a circular ring bag body made of rubber. The bag body is a hollow sealing structure. A valve is installed on the bag body. The valve is communicated with the inner chamber of the bag body. At least two sealing strips are distributed along the circumferential direction on the inner circumferential surface of the bag body. A gap exists between the sealing strips. The sealing strips and the inner circumferential surface of the bag body form an integral body during manufacturing. When pneumatic sealing is performed, the stern is allowed to rotate at low speed to enable a ship to get away from a severe environment with heavy wind and big waves and then to be repaired, and the wind and wave resisting ability of the ship is greatly improved.

Description

Technical field: [0001] The invention relates to a ship stern shaft sealing device, in particular to the improvement of a sealing air bag in the air pressure sealing device. Background technique: [0002] Ship stern shaft air pressure sealing device is widely used in ship stern shaft sealing due to its superior performance, convenient use and simple structure. The air pressure sealing device is usually used together with the ship stern shaft water lubricated sealing device or oil lubricated sealing device. The sealing device does not work, and the stern shaft seal is completed by an oil-lubricated sealing device or a water-lubricated sealing device (including a water-lubricated sealing device). When the stern shaft seal fails during the ship's navigation and needs to be repaired, in order to prevent water from entering the ship's cabin, it is easy to maintain Generally, after the stern shaft stops rotating, the compressed air is filled into the sealing air bag to inflate the...

AI Technical Summary

Problems solved by technology

The current air pressure sealing device is composed of an air pressure sealing seat and an open-type sealing air bag installed in the air-pressure sealing seat. When sealing, a large amount of gas needs to be filled to expand the open-type air sealing air bag, and tightly surround and cling to the stern shaft, thereby creating a As far as the sealing effect is concerned, the disadvantage of this open airtight airbag is that the contact area between the inner peripheral surface of the open airtight airbag and the stern shaft is relatively large during sealing, and the stern shaft cannot rotate when the open airtight airbag surrounds and is close to the stern shaft. Otherwise, the frictional force between the stern shaft and the open-type sealed airbag will damage the open-type sealed airbag, causing a major accident of water ingress, and a stationary ship is prone to lose control in a windy and rough environment

At present, the sealed airbag that can allow the stern shaft to rotate at low speed has not been found, nor has it been found in literature and media reports

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