Views:38 Author:Site Editor Publish Time: 2020-05-26 Origin:Site
The modern thermos cup was invented by British physicist Sir James Dewar in 1892. At that time, he was carrying out a research work to liquefy the gas. In order to liquefy the gas at low temperature, the first thing to do is to design a container that can insulate the gas from the outside temperature. So he asked the glass technician Borg to blow a double-layer glass container for him. The inner walls of the two layers were coated with mercury, and then the air between the two layers was extracted to form a vacuum. This kind of vacuum bottle, can keep the temperature of the liquid inside for a certain period of time.
There are three ways of heat transfer: radiation, convection and transfer. The silver cup can reflect the radiation of hot water. The vacuum of cup and body can block the heat transfer, while the bottle that is not easy to transfer heat can prevent the heat convection. The principle of magnetized water is also applied to the thermos bottle, that is, a magnet is added to the bottom and the cap of the bottle to magnetize the water.
The cup body of the thermos cup adopts double-layer structure, and the vacuum of the cup body can block the heat transfer. And whether the sealing performance of the insulating cup is good also plays a very important role in the insulation effect. The better the sealing, the more difficult the heat is to be transferred, so that the better the insulation effect.
Vacuum does not transfer heat, which is equivalent to cutting off the heat transfer medium. The higher the vacuum degree, the better the insulation effect. At present, most of the insulation cup manufacturers use double-layer stainless steel vacuum structure.
Copper or silver plating on the inner liner can effectively form a layer of heat insulation net in the inner liner of the heat preservation cup. So the copper plating can effectively reduce the heat loss through radiation by reflecting the heat radiation.
The vacuum flask is generally made of ceramic or stainless steel and vacuum layer. It has a cover on the top and is tightly sealed. The vacuum heat insulation layer can delay the heat dissipation of the water and other liquids inside, so as to achieve the purpose of heat preservation.