Winter to a lot of small friends have taken out the vacuum thermos cup, after a cleaning, happy to take out the use. Turns out the thermos is no longer warm, and instantly the good mood is gone. A lot of times we wonder why the last time it was fine, now it’s not warm. If we know the principle of vacuum thermos, we know why there is no heat preservation, which is usually caused by man.
Previous articles have introduced to my friends that the principle of vacuum thermos insulation is to use vacuum to cut off heat conduction to achieve vacuum thermos insulation. Double layer stainless steel stainless steel vacuum is carried out at high temperature, using the principle of thermal expansion and contraction of air, let the air in the vacuum cup body discharged, and then natural cooling reached the principle of vacuum. Thermos can easily become uninsulated when accidentally knocked against.
The thermos cup is not thermal insulation depends on what causes it. If it is caused by the broken silica gel ring, it can be directly changed to the silica gel ring. If it is not kept warm because of falling to the ground or colliding with other hard objects during use, then the thermos cup is considered obsolete. There are a lot of people do not understand why the thermos cup is not heat preservation once it falls, mainly because the air hole is opened, the air flows into the thermos cup body, causing no heat preservation.