Life support systems are generally divided into two types: fixed and portable. Those installed in the cabin with facilities such as temperature adjustment, humidity adjustment, decompression, oxygen supply, food supply and air purification are fixed for astronauts to live and work in the cabin. Of course, astronauts can't stay in the cabin all the time. In order to study and work, they sometimes go outside the cabin. At this time, a portable life support system is needed.
It should be noted that the life support system of manned spacecraft is developed on the basis of the aircraft environmental control system, which is more advanced and perfect. It includes not only pressure, temperature, humidity, oxygen supply, gas distribution and other control systems, but also astronaut systems, that is, astronauts' daily life support systems such as diet, rest, sleep and excretion. Because the environment inside and outside the airplane cabin is different, the environmental control system is also different.
Since 196 1, astronaut you? Love? After Gagarin went into space, astronauts stayed in space for longer and longer, and there were more and more space missions. In this way, life support system becomes more and more complex and reliable.