US 2006/0219724 A1Published application

Thermos heated from the outside

OwnerVladimir Melnikinventor

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Abstract

A thermos is disclosed which has been modified so, that its content can be heated while inside the thermos and stays hot for a long time after the external heat source has been removed. The thermos combines properties of a Dewar's vacuum bottle and properties of a heat pipe. It comprises an outer vessel, an inner vessel and a vacuumized space between the vessels. A working substance having a liquid phase and a vapor phase is disposed within the vacuumized space, on the bottom wall of the outer vessel. The amount of the working substance is less than would be necessary to fill the interval between the bottom walls of the vessels. The saturated vapor pressure of the working substance is less then 10 Pa when the outside heat source is removed or turned off. When the thermos is heated, the working substance absorbs heat from the bottom wall of the outer vessel, vaporizes, and delivers the latent heat of vaporization to other parts of the thermos. When the outside source of heat is removed, the device converts to a Dewar's vacuum bottle.

Claims1

Dependent claims

A thermos heated from the outside, comprising:

(a) an outer vessel having a lateral wall with a top edge, and a bottom wall, which is the part of the thermos to receive heat from an outside source of heat during a heating process;
(b) an inner vessel, accommodated inside said outer vessel, and having a lateral wall with a top edge, and a bottom wall;
said top edge of said outer vessel and said top edge of said inner vessel joined together hermetically to form a thermos mouth opening and to form a space between said vessels;
said space between said vessels is vacuumized to an air pressure lower than 10 Pa to form a thermal insulating layer between said vessels;
(c) a working substance positioned on said bottom wall of said outer vessel within said vacuumized space between the vessels;
said working substance is capable of absorbing heat from said bottom wall of said outer vessel during the heating process and delivering heat to all other walls of said thermos in three steps:
evaporation, condensation, and return in liquid phase to said bottom wall of said outer vessel;
the amount of said working substance is less then would be necessary to fill the interval between said bottom wall of said outer vessel and said bottom wall of said inner vessel;
saturated vapor pressure of said working substance is less than 10 Pa when the outside source of heat is turned off or removed;
(d) a thermal insulating lid which forms an air tight barrier when placed on said thermos mouth opening.

7 more elements

Dependencies are inferred from the claim text.