Submarine of 10 thousand tons of a large ship, warship is never-ending in the sea, lean in the airscrew drive of underwater completely. Extend projecting end axis from cabin, connecting airscrew directly, connecting engine room directly, end axis and axis have crack necessarily between the canal.
Want to assure transmission efficiency already, otherwise is slack, be about test marine is sealed worked. Sealed and bad, seawater is swarmed into along aperture below pressure, that is dangerous.
End axis installs large marine to be in charge of in end axis inside, by around two bearing are propped up rise movement. A bearing before crying, one calls end bearing, airtight end rod tube is between two bearing. Whole system is in charge of by end axis, end bearing, seal unit, lubricant form with cooling system.
The sort of bearing is very much, cent water is lubricant, oil-lubricated two kinds. Lubricant bearing has water bearing of pressing plate of layer of iron pear wood, birch, balata; Oil-lubricated bearing has white alloy bearing, scroll bearing to wait a moment.
These bearing have actor drawback each: For instance balata bearing, because its are stretch big, suit to wait in inland river, coastal waters contain mud arenaceous more water area is used; And bearing of white alloy bearing, iron pear wood applies on seagoing vessel extensive.
Bearing of wood of ▲ iron pear
Iron pear wood is a kind of precious rare wood that grows naturally, the price is high, making furniture also is wonderful. Birch layer pressing plate is its substitute.
There is seal unit between bearing and end axis axle sleeve, loading the task that seals water to seal oil, one kind is contact, contact of another kind of dispute.
1, contact: Use the fill such as products of dish of root, rubber to be in aperture, fall in pressure with end axis (or axle sleeve) close together joint.
The Xinpolaikesi that uses extensively among them Simplex (leather bowl type) seal unit, obtain attestation of association of each country ship' classification, have CX basic model, DX, AX of free from contamination etc.
▲ Simplex AX seal unit
Its weather strip is group of labial form rubber, go up in end axis axle sleeve with bedspring band, below pressure of seawater, bedspring and balata bounce, sealing ring closely joint is on axle sleeve. This kind of sealing ring should decorate several groups, more popular is end bearing 4 groups, before bearing 2 groups.
Balata of ▲ lip form is encircled
4 groups of sealing ring of the rear break up two groups forth, two groups of in the future break up. Their responsibility is major, want to prevent seawater to swarm into already, want to prevent slippery oily leak to pollute an environment in the sea again. #3S date sealing ring is to reserve, when breakdown of #3 date sealing ring switch is used.
Infuse compresses air and lube between sealing ring, lubricate on one hand cooling, maintain dynamic balance with briny pressure on one hand, prevent seawater to swarm into, adjust atmospheric pressure along with shipping draft change.
▲ end 3 before 2
Task of first 2 groups of sealing ring is much simpler, should prevent slippery oily leak to arrive inside the boat only went.
Lube is used circularly, receive gravitational oil ark repeatedly by conduit or low an observation ark. If sealing ring is slack, water enters oily cabinet, the sailor observes scale of change of face of oily ark fluid and water oil, can know the sealing ring that where is is bad, should repair in time into dock change.
Tracing ability of Simplex sealed axis is good, get used to a face wide, sealed effect is good, service life is long also.
2, blame contact. Common end panel is for instance sealed, it is a kind of mechanical seal unit.
Face of end panel thick inside front cover has move annulus, static link, make by wear-resisting material. Move annulus to turn together along with end axis, fall in fluid pressure and bedspring bounce action, move the joint with annulus and static close together annulus to be together, cooperate to assist again sealed, close seawater be besides cabin.
End panel is sealed the effect small, life grows good, leakage rate, but the price is more expensive, installation service call is taller also.
In addition, still have type of oil seal of framework type balata, float water of type of case of sealed, filling water of type of sealed, EVK is lubricant type of sealed, oily circle is sealed etc.
Submarine sails in deep sea mile, susceptive is hydraulic big, sealed means also compares ordinary surface boats and ships more complex. It has many sealed package, the rear still has sealed skin bowl, clingy below briny pressure go up in end axis, protective submarine does not suffer seawater to encroach.
Mixed seal unit is protecting a ship, realized concentrated power to transmit already, sea cement arenaceous close the door on, still prevent slippery oily leak. They not only use on end axis, also use in helm canal, decrease shake fin on the spare parts that these and seawater connect, it is one of unit with the mainest shipping.
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