JPS594889A - Heat insutation type hot-water heater - Google Patents

Abstract

PURPOSE:To contrive to maintain the hot-water temperature intact after being boiled in a kettle without necessity of transferring the excessive hot-water into another heat insulation type vessel by a method wherein a sealing space surrounded by an inner vessel and an outer vessel is evacuated to make vacuum, and a refrigerant medium is sealed into said sealing space surrounded by the bottom part at both of the inner and outer vessels, and the lower vessel after said sealing space is evacuated. CONSTITUTION:A heat insulation hot-water heater is composed of an inner vessel 1 containing a water 7, a cylindrical outer vessel 2 surrounding the periphery side of the inner vessel 1, upper and lower ends of which is connected with said inner vessel 1, and cylindrical lower vessel 4 having a bottom, while the upper end of which is connected with said outer vessel 2. The inner vessel 1 and the outer vessel 2 are thermally separated by the vacuum heat insulation, a refrigerant 5 is sealed into the sealed space surrounded by a bottom part 3 of both of the inner vessel 1 and the outer vessel 2, and the lower vessel 4. As for the heat dissipating from a boiled hot-water 7, the heat dissipation caused by the convection toward the side surface can be prevented by the vacuum existing between the inner vessel 1 and the outer vessel 2. Although the space surrounded by the inner vessel 1, the outer vessel 2 and the lower vessel 4 is filled up with the refrigerant 5 and the gas, the heat source is located at the upper part of the vessel 4, thereby the convection does not occur, accordingly, the heat dissipation toward the lower surface can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a water heater that is capable of keeping hot water warmed in a kettle as it is.

[Prior Art and Its Problems] When boiling water in a conventional kettle, the boiling water would cool down rapidly if left undisturbed. In order to keep this boiling water warm for a long time,
It was necessary to transfer 1l17'fl to another heat-insulating container. During this transfer, there were many cases of heat loss and burns caused by contact with the kettle surface or boiling water.

In addition, in order to reheat hot water whose temperature has dropped after being stored in a heat-insulating container for a long period of time, it was necessary to return the water to the kettle.

[Object of the Invention] The present invention allows hot water boiled in a kettle to be kept warm without requiring the hot water to be transferred to a heat-insulating container as described above. The present invention also provides a heat insulating container that can prevent contact with the surface of a kettle and prevent burns from boiling water.

[Summary of the Invention] The present invention comprises a cylindrical inner container with a bottom, a lid attached to the upper end of the inner container in close contact with the inner container, and a side surface of the inner container, the upper end and the lower end of which are attached to the inner container. It consists of a connected cylindrical outer container and a cylindrical lower container with a bottom whose upper end is connected to the bottom of the outer container, and the sealed space surrounded by the inner container and the outer container is evacuated. In the heat-retaining water heater, a refrigerant is sealed after evacuation in a sealed space surrounded by the inner container, the bottom of the outer container, and the lower container.

Effects of the Invention] In the heat-retaining water heater of the present invention, the hot water is kept warm even if the hot water is left as is without being transferred to another heat-retaining container.

[Embodiment of the Invention] The container comprises a cylindrical outer container 2 whose lower end is connected to the inner container 1, and a cylindrical lower container 4 with a bottom whose upper end is connected to the lower end of the outer container 2. The inner container 1 and two outer containers are vacuum insulated, and a refrigerant 5 is sealed in a closed space surrounded by the bottom 3 and lower container 4 of the inner container 1 and the outer container 2.

Next, the effects of the present invention will be described. The bottom of the G-F thermal water heater of the present invention is heated with a high heat source 8. Inner container] The refrigerant 5 contained in the space between the bottom 3 of the outer container 2 and the lower container 4 receives heat from the high heat source 8 and boils and evaporates. Needless to say, the temperature of the bottom 3 of the inner container 1 containing the water 7 is that of the water 7. Now, when the vapor of the refrigerant 5 comes into contact with the bottom 3, it is deprived of heat by the water 7 and condenses. The refrigerant 5, which has been condensed after losing heat to the water 7, returns to its original heat source by gravity. After repeating this heat cycle, the temperature of the water 7 rises until it boils, at which point the high heat source 8 is removed.

Next, let's look at the heat escaping from the boiling water 7. Heat escaping to the sides does not occur because the space between the inner container and the outer container 2 is kept in a vacuum, so heat escaping through convection does not occur. The heat escape caused by the radiation trap can be reduced to a very low level if the inner surfaces of the inner container 1 and outer container 2 are mirror-finished. If the thickness of the inner container 1, outer container 2, and lower container 4 is made thin, only a small amount of heat can escape by conduction.

Heat escapes to the bottom 1 m because the space between the inner container 1, outer container 2, and lower container 4 is filled with refrigerant 5 and gas, but since the heat is in the upper part, no convection occurs. Heat leaks like those from the side surfaces can be prevented in the same way as the side surfaces.

1-Another embodiment of the invention 1 In FIG. 2, the vacuum part between the inner container 1 and the outer container 2 is made to protrude into the inside of the lower container 4 so that the space in contact with the bottom 3 of the inner container 1 contacts the bottom of the lower container. It is divided into two spaces, and the two spaces are communicated through a narrow passage.

By applying this pressure, the path of heat escaping by conduction through the container can be lengthened, and the amount of heat escaping can be further reduced. Furthermore, the area that receives radiation is also reduced, and heat leakage due to radiation can also be reduced.

FIG. 3 shows the vacuum part between the inner container 1 and the outer container 2 protruding into the lower container 4 in FIG. 3, with the space in contact with the inner container 1 expanded to the upper part of the side surface.

In this way, the heat transfer area can be increased and the water can be heated more quickly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a typical embodiment of the present invention, FIG.
FIG. 3 is a sectional view showing another embodiment. 1... Inner container, 2... Outer container, 3... Inner container bottom, 4... Lower container, 5... Refrigerant, 6.
...Handle, 7...Water, 8...Manpower, 9...
Lid, a...condensate, b...steam. Agent: Patent attorney Kensuke Chika (and 1 other person)

Claims (2)

[Claims] (1) A cylindrical inner container with a bottom, a lid attached to the top of the inner container in close contact with the inner container, and surrounding the side of the inner container,
a cylindrical outer container whose upper and lower ends are connected to the inner container;
a cylindrical lower container with a bottom connected to the bottom of the outer container at its upper end; evacuating a sealed space surrounded by the inner container and the outer container; A heat-retaining water heater characterized in that a refrigerant is sealed in a sealed space surrounded by a lower container and a lower container after being evacuated. (2) The vacuum part between the inner container and the outer container is made to protrude into the inside of the lower container, dividing it into two spaces: a space in contact with the bottom of the inner container and a space in contact with the bottom of the lower container, and the two spaces are communicated through a narrow passage. The heat-retaining water heater according to claim 1, characterized in that: