The principle of action of life jackets and what types of life jackets are there

1.Buoyant material filled life jacket, that is, made of nylon cloth or neoprene, with buoyant material filled in the middle.

2.Inflatable life jacket: made of high-strength waterproof material, similar to the principle of inflatable lifebuoy or swimming ring.

It is divided into automatic inflatable type or passive inflatable type. However, the most important thing to pay attention to in this life jacket is to absolutely avoid sharp objects piercing or wearing out the waterproof layer, which will cause unimaginable serious consequences after air leakage.

According to the principle of buoyancy, it can be divided into buoyancy material filled life jacket and inflatable life jacket.

1. Buoyancy material filled life jacket

The fabric is mostly made of neoprene composite material, with a variety of colors to match, which is fashionable and beautiful. The buoyancy material of the life jacket is polyethylene foam. There is also an internal EVA foam material, which is compressed and 3D three-dimensional molding, and its thickness is about 4 cm (5 6 thin hair materials are produced in China, and the thickness is about 5 7 cm).

2. Inflatable life jacket

It is made of high-strength waterproof materials, similar to the principle of inflatable lifebuoys or swimming rings, and is divided into automatic inflatable or passive inflatable type. However, it is absolutely necessary to avoid sharp objects piercing or wearing out the waterproof layer, as air leakage will cause unimaginable serious consequences.

How it works

Inflatable life jackets have two functions: manual inflation and automatic inflation.

1. Manual inflation: pull the pull rope on the inflator before or after falling into the water to turn the pull rod to no less than 90 degrees, the needle punctures the diaphragm of the gas cylinder, and the high-pressure CO2 gas rushes into the air bag, and the gas expands to produce buoyancy.

2. Automatic inflation: After falling into the water, the life jacket is immersed in the water to soften the water-sensitive element in the automatic device, the firing pin loses its blockage, and the spring extension pushes the firing pin to puncture the sealing membrane of the gas cylinder CO2 gas and injects the airbag to produce buoyancy.

3. The mouthpiece is a one-way valve type, and the one-way valve will automatically close after blowing.

Life jackets are generally divided into two types: inflatable life jackets and foam life jackets. 1. Foam life jacket refers to a fabric made of nylon cloth or neoprene, filled with buoyancy materials such as foam boards, which have enough buoyancy to make the head of the person in the water exposed. Generally, we use marine life jackets.

The inside of the material is made of EVA foam, which is compressed and 3D three-dimensional, and its thickness is about 4 cm (5 6 pieces of thin hair material produced in China, about 5 7 cm thick). Life jackets produced according to standard specifications have their buoyancy standards: generally 24 hours for adults, 5 kg for children, 24 hours, so as to ensure that the chest above the surface of the water.

2. Inflatable life jackets are divided into two types: automatic inflatable life jackets and manual inflatable life jackets, which are made of high-strength waterproof materials, and inflatable life jackets are mainly composed of sealed inflatable vest airbags, miniature high-pressure gas cylinders and fast inflatable valves, etc., which are often used in the work with the possibility of falling into the water. Under normal circumstances (not inflated), the entire inflatable life jacket is draped on people's shoulders and backs like a ribbon, and because of its small size, it does not hinder people's freedom of operation; Once it falls into the water, it can be inflated into a life jacket with 8-15 kg buoyancy in 5 seconds when it encounters danger in the water and needs buoyancy, or it can be automatically inflated and inflated according to the action of the water (fully automatic inflatable life jacket), or the cable on the inflatable valve is pulled by a person (manual inflatable life jacket); The life jacket lifts the human body upwards so that the head and shoulders are exposed to the water, so that they can be safely protected in time. Due to the use of water-resistant and breathable materials on the surface of this life jacket, in addition to paying attention to its buoyancy, it should also be noted that it is absolutely necessary to avoid sharp objects piercing or abrasion the waterproof layer, which will cause unimaginable serious consequences after air leakage, so the inflatable life jacket should be checked for air leakage before use.

1) Put the life jacket around your neck, place the rectangular buoyancy bag in front of you, and tie the strap of the neckline; 2) The left and right straps are passed through the buckle loops on the left and right sides respectively, and crossed around the back; 3) Then pass the strap through the buckle loop on the chest and tie the dead knot. 1) Some life jackets are only equipped with reflective film on one side, and if the reflective film is worn inside, it will not work. 2) Tie the strap into a dead knot so as not to be affected or float for a long time when diving.

3) Pull the cables on the left and right sides, the inflation valve opens, and the life jacket is inflated in a few seconds. The hand-inflatable life jackets on the aircraft are also equipped with a variety of equipment: the power supply of the azimuth indicator is activated by seawater, which can be powered for more than 12 hours; Some are also equipped with whistles, mirrors, etc.

In times of danger, it is an important life-saving tool for passengers. When the aircraft encounters an emergency, such as the aircraft is forced to land at sea or on a lake for some reason, passengers on the aircraft must wear life jackets, float on the water, and wait for the arrival of rescue vessels or personnel.

According to Article 193 of the Civil Aviation Flight Regulations of China, when a land aircraft is flying at sea more than 25 kilometers from the coast, it must carry life jackets and lifeboats on board that can be used by all personnel. When flying long distances at sea, you should also carry the necessary life-saving equipment (desalination, food, fishing gear, medicines, emergency radio, etc.).

Therefore, modern civil airliners, whether international or domestic airline flights, are equipped with a set of life jackets under each seat. Once you need it, just sit in your seat and bend down and reach for it.

Life jackets are generally designed as disposable and are not in use. It cannot be taken out and inflated at will.

Crash landings on water don't necessarily disintegrate. Even if disintegration is possible, there will be survivors. So the life jackets designed by aircraft designers are a chance to survive the survivors of the plane crash.

And this design was not conceived out of thin air, but rules derived from the analysis of the incident with the crashed plane.

This literally means that the plane has successfully made a forced landing on the sea, and during the rescue period, the main thing is that the plane needs to make a forced landing on the sea due to a malfunction, and the pilot's skills are very good, and the forced landing is successful, but the rescue takes a certain amount of time to arrive, so you need to wear a life jacket during this period.

There are life jackets on the plane, which are used for forced landing at sea, it is not only used as a floating aid, its bright color can make it easy for rescuers to find survivors in the open area, at the same time, in low temperatures, strong winds and ice-covered areas, it can also play a certain role in keeping warm, the top of the life jacket is equipped with a positioning light, after the battery of the life jacket is blistered by the sea, the positioning light will automatically light up every few seconds, which can last for 8 to 10 hours, so that the person who falls into the water can be found at night.

Anyone who has ever flown on a plane should know that after you board the plane, the charismatic flight attendants and handsome flight attendants will give you safety demonstrations and take the trouble to introduce you to life jackets, oxygen masks, etc. Have you listened carefully? Do you know the correct way to use it?

Let's take a look!

Look at your luck! If you can get out of the cabin as soon as possible, there is still hope!

If you stay in the cabin for a long time, you can imagine!

Life jacket, also known as life vest, is a kind of life-saving clothing, similar to a vest, made of nylon fabric or neoprene, buoyancy material Li Chang or inflatable material, reflective material, etc.

1. Rent wax buoyancy material filled life jackets.

Buoyancy padded life jackets are made of nylon cloth or neoprene with buoyant material in the middle.

2. Inflatable life jacket

The inflatable life-saving slip-on suit is made of high-strength waterproof material, similar to the principle of an inflatable lifebuoy or swimming ring. It is divided into self-inflatable or passively inflatable type, but this kind of life jacket absolutely avoids sharp objects from piercing or abrasion the waterproof layer, and air leakage will cause unimaginable serious consequences.

The life jacket is made of nylon fabric (or neoprene), buoyancy material (or inflatable material), reflective material, etc. A life jacket is a life-saving garment designed to resemble a vest and is buoyant enough to expose the head of a person who has fallen into the water. It usually has a service life of 5-7 years, and is one of the life-saving equipment on ships and hail and aircraft.

The life jacket is made of nylon fabric (or neoprene), buoyancy material (or inflatable material), reflective material, etc. A life jacket is a life-saving garment designed to resemble a vest and is buoyant enough to expose the head of a person who has fallen into the water. It usually has a service life of 5-7 years and is one of the life-saving equipment on ships and planes.