The thermos bottle is filled with hot water, the shell will be very hot, what’s the matter
1. If the thermos bottle is filled with hot water, the outer shell will be very hot because the inner liner is broken and needs to be replaced.
Second, the principle of the liner:
1. It is composed of two glass bottles inside and outside. The two are connected into one body at the mouth of the bottle, the gap between the two bottle walls is evacuated to weaken heat convection, and the surface of the glass bottle wall is plated with a bright silver film to reflect infrared heat radiation.
2. When the inside of the bottle is high temperature, the heat energy of the content does not radiate outward; when the inside of the bottle is low temperature, the heat energy outside the bottle does not radiate into the bottle. The thermos bottle effectively controls the three heat transfer methods of conduction, heat convection and radiation.
3. The weak point of thermos insulation is the mouth of the bottle. There is heat conduction at the junction of the inner and outer glass bottle mouths, and the bottle mouth is usually blocked by a cork or plastic stopper from heat loss. Therefore, the larger the thermos bottle capacity and the smaller the bottle mouth, the higher the thermal insulation performance. The long-term maintenance of the high vacuum of the bottle wall interlayer is extremely important. If the air in the interlayer is gradually inflated or the small exhaust tail that is sealed is damaged, and the vacuum state of the interlayer is destroyed, the thermos liner loses its thermal insulation performance.
Three, the material of the liner:
1. Made of glass material;
2. Features of stainless steel material: strong and durable, not easy to damage, but the thermal conductivity is greater than that of glass, and the thermal insulation performance is slightly worse;
3. Non-toxic and odorless plastics are made of single-layer and double-layer containers, filled with foam plastics for heat insulation, light and convenient, not easy to break, but the heat preservation performance is worse than vacuum (stainless steel) bottles.
Is it normal for the outer wall of the thermos cup I just bought to heat up after being filled with hot water?
unusual. Generally speaking, the thermos cup will not have the problem of heating the outer wall. If this happens to the thermos cup you bought, it means that the insulation effect of the thermos cup is not good.
The thermal insulation of the inner liner is the main technical index of the thermos cup. After filling it with boiling water, tighten the cork or lid clockwise. After 2 to 3 minutes, touch the outer surface and lower part of the cup body with your hands. If there is obvious warming phenomenon, it means that the inner tank has lost the vacuum degree and cannot achieve a good heat preservation effect.
Shopping skills
Check to see if the surface polishing of the inner tank and outer tank is uniform, and whether there are bumps and scratches.
Second, check whether the mouth welding is smooth and consistent, which is related to whether the feeling of drinking water is comfortable.
Third, look at the plastic parts. Poor quality will not only affect the service life, but also affect the sanitation of drinking water.
Fourth, check whether the internal seal is tight. Whether the screw plug and the cup fit properly. Whether it can be screwed in and out freely, and whether there is water leakage. Fill a glass of water and invert it for four or five minutes or shake it vigorously a few times to verify whether there is a water leak.
Look at the heat preservation performance, which is the main technical index of the thermos cup. Generally, it is impossible to check according to the standard when purchasing, but you can check it by hand after filling it with hot water. The lower part of the cup body without heat preservation will heat up after two minutes of filling hot water, while the lower part of the cup with heat preservation is always cool.
The outer wall of the stainless steel thermos is very hot, what’s the matter?
It is because the thermos is not vacuum, so the heat from the inner tank is transferred to the outer shell, which makes it feel hot to the touch. Similarly, because the heat is transferred, such a thermos can no longer keep warm. It is recommended to call the manufacturer and ask for a replacement.
Extended information
The stainless steel thermos cup has the function of heat preservation and cold preservation. Ordinary thermos cups have poor heat preservation and cold preservation functions. The effect of vacuum thermos cups is much better. In hot weather, we can use vacuum thermos cups to fill ice water or ice cubes. , so that you can enjoy the cool feeling at any time, and it can be filled with hot water in winter, so that you can drink hot water at any time.
The stainless steel thermos cup can be customized according to requirements, and the operation is more flexible and convenient. Therefore, more and more people regard the stainless steel thermos cup as a gift for friends, customers, and promotions. Do it on the body of the cup or on the lid. Post your own company information or pass blessings and other content. This kind of customized gift is being accepted by more and more people.
What is the reason why the thermos cup is not insulated and the outside is hot? Can it be repaired?
The heat on the outside of the stainless steel thermos cup is due to the failure of the insulation layer.
The stainless steel thermos cup is insulated by the vacuum between the inner and outer layers. If a leak occurs, the vacuum will be destroyed and it will not have the function of heat preservation.
The repair needs to find the leak point, repair and weld under vacuum conditions to eliminate the leak. Therefore, it is generally considered not worth repairing it.
Post time: Feb-07-2023