The stern shaft seal of the ship may leak due to various reasons. The sea water enters the seal chamber, causing the oil in the rear seal oil tank to be emulsified (see Figure 1). In serious cases, the oil leaks out to the sea, causing the port authorities to detain or fine, or the sea water leaks inward, causing the stern tube oil to be emulsified, the lubricating oil film to fail, causing serious accidents such as high temperature or even burning of the stern bearing, which bring serious potential safety hazards to the ship. ...

1. Working principle: This type of stern shaft sealing rubber ring is used to generate force on the working surface by the pressure of liquid (sea water or lubricating oil) to compress the rubber ring lip on the shaft sleeve surface to achieve the purpose of sealing. There are four oil seals in this unit, and and NO.2 are working towards the propeller to seal the water; The No. 3 channel and No. 3S channel work towards the main engine to seal oil. When the new installation is just put into use...

With the increasingly strict requirements of port countries on pollution prevention, major equipment manufacturers have invested a lot of manpower and material resources in the research and development of new equipment. The air type stern shaft seal can better solve the pollution of the marine environment caused by oil leakage, and solve the wear of the seal ring and bushing to the maximum extent. In addition, the device has high reliability and can be easily converted to traditional oil seal in emergency, so air seal has great development space. Taking the air type stern seal of 10000TEU series ships of a company as an example, this paper discusses the working principle and technical key points of the device....

The stern shaft sealing device is one of the important parts of the ship shafting. Its performance directly affects the operation of the ship, and also plays a very important role in preventing the stern shaft lubricating oil from polluting the marine environment. Therefore, it is extremely necessary to study the stern shaft sealing device. On the ship where the author is working, the engine room stern shaft seal oil tank gave a high level alarm when sailing in strong wind and waves. After inspection, it was found that the poor stern shaft seal caused seawater to leak into the seal oil chamber, causing the seal oil tank to be high and emulsified. There are two common cases of leakage of sealing oil of ship's stern shaft: first, in strong wind and wave weather, the draft of ship's stern is small, and severe vibration of the hull will cause poor sealing of the sealing device; ...