One end of the propeller is in the cabin, and the other end is outside the ship. The propeller is rotating, so there must be a gap at the connection of the propeller, and this gap is at the bottom of the water, so how is the connection of the propeller waterproof?
At present, the connection between the propeller and the hull of the ship is made of professional sealing materials, such as rubber or Teflon and other materials with good waterproof performance, which can achieve very good waterproof performance.
To know how a ship is waterproof, we must first understand a major component, which is the bearing connected to the propeller called the tail shaft. The sealing ability of the tail shaft is an important manifestation of the technical level of a country's shipbuilding industry.
Generally, the tail shaft of a ship is installed on two bearings, one is called the tail bearing, which is the part of the hull in contact with the water, and the other is called the front bearing, which is connected to the engine room, and the seal of the tail shaft is
It is achieved by the sealing ring installed next to the front and rear bearings.
There are several sealing rings in the front and rear bearings, and these sealing rings are filled with oil. The oil flows down from an oil tank at a certain height, that is, a gravity oil tank. By pressurizing, it
It can balance the pressure of the water, and the oil can lubricate the sealing ring, reducing the wear of the rubber ring.
In the industry, this is also called tail seal and front seal. If the tail seal leaks, water pressure enters between the two seal rings, causing the oil level of the gravity oil tank to rise, and the detection and alarm system will automatically alarm. The technology on board The personnel will go to check it.
The amount of oil filled in the transmission shaft is automatically matched according to the external water pressure, and finally reaches a balance to prevent water seepage, and some water will seep into the transmission shaft and mix with the oil, and the oil will separate the mixed water and oil during the circulation process.
To put it simply, it is to fill the gap between the transmission shaft and the boat with oil, or create air pressure to prevent the infiltration of water, so as to achieve the waterproof effect.
After the ship is launched, the sealing ring will be damaged after long-term wear and corrosion, causing water leakage into the hull, which will affect the normal operation of the ship, because the sealing ring is not forged with steel like other parts, it is only a circle The airtight rubber ring does not have as long a service life as steel, but its role is very important.
At any time, the waterproofing of a ship is an important task, and it is also one of the important indicators for measuring a ship. After all, a ship is sailing on the water. If a place seeps, it will increase the operating cost, and the ship will capsize. cause serious shipwreck.
