JPS63192Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electrically heated vacuum double bottle that can heat the contents of the inner cylinder with a heating element via a heat medium and then keep the contents adiabatic.

Conventionally, electric heating type thermos pot (vacuum double bottle) has the functions of both a kettle pot and a thermos flask.
It has been known. This electrically heated vacuum double bottle is
An inner cylinder and an outer cylinder made of metal such as stainless steel with a bottom are integrated by welding at the upper opening, an electric heater is fixed to the bottom of the inner cylinder, and a vacuum is drawn between the inner and outer cylinders to create a vacuum. This is a heat insulating layer.

This electrically heated vacuum double bottle is a new and unprecedented product that can both heat the contents and keep them warm afterwards, and can do both in an insulated manner, making it convenient and economical. It is something.

By the way, it is normal for the above-mentioned products to always be required to improve their performance and economical efficiency, and the current situation is that they must also achieve heat retention and energy saving.

This idea was made in view of the above circumstances,
The purpose is to provide an electrically heated vacuum double bottle that can further improve heat retention and further save energy.An intermediate cylinder is provided between the inner cylinder and the outer cylinder. , a vacuum insulation layer is provided between the intermediate cylinder and the outer cylinder, and a heat transfer medium is inserted between the inner cylinder and the intermediate cylinder to form a heat transfer and heat storage layer.

This invention will be explained below with reference to the drawings. FIG. 1 shows a first embodiment of this invention, in which reference numerals 1, 2, and 3 indicate an inner cylinder, an intermediate cylinder, and an outer cylinder that are integrated at their respective openings. .

A heat medium 4 is injected between the inner cylinder 1 and the intermediate cylinder 2, forming a heat transfer and storage layer 5.
As the heat transfer medium 4, a liquid such as water or alcohol, which repeats a phase change of evaporation and condensation due to the input and output of heat, or a solid such as microcrystal wax or wood metal, is used. The volume occupied by the medium 4 is set to be small enough to cause a phase change of evaporation and condensation as shown in the figure.

Further, the space between the intermediate cylinder 2 and the outer cylinder 3 is evacuated to form a vacuum heat insulating layer 6.

A heating element 7 is attached to the bottom portion 2a of the intermediate cylinder 2 within the vacuum insulation layer 6. As the heating element 7, a sealed type such as a sheathed heater or an alumina heater is used.

In the electrically heated vacuum double bottle having the above configuration, when the heating element 7 is energized and generates heat, the heating medium 4 in the heat transfer and storage layer 5 is heated and a phase change (evaporation) occurs. wake up This rise in temperature of the heat medium 4 causes the contents in the inner cylinder 1 to be heated. This content then reaches the desired temperature and
Even after the electricity is turned off and the heating element 7 stops generating heat, thermal energy is stored in the heat transfer and heat storage layer 5 in the form of a phase change of the heat medium 4, so that a change occurs naturally in the contents of the inner cylinder 1. Temperature reduction will be significantly delayed. In other words, the heat retention performance of this electrically heated vacuum double bottle is significantly improved. Moreover, this heat retention is not achieved by heating;
Since it is covered by thermal energy, energy efficiency is also improved.

FIG. 2 shows a second embodiment of this invention, in which parts common to those in FIG. 1 are given the same reference numerals to simplify the explanation. This second embodiment differs from the first embodiment in that the heating element 7 is attached to the bottom 1a of the inner cylinder 1 within the heat transfer and storage layer 8; and the bottom 2a of the intermediate cylinder 2, and the heat transfer medium 9 constituting the heat transfer and storage layer 8 is made of alcohol, microcrystal wax, wood metal, etc. due to the melting and transition. These include the use of materials that store thermal energy in the form of latent heat. The heat medium 9 simply melts or transforms when heated by the heating element 7, and does not undergo large expansion such as evaporation. The filling amount is set so that the total volume of the layer 8 is completely or almost filled.

In the electrically heated vacuum double bottle with the above configuration, when the heating element 4 is energized to generate heat and the heat medium 9 is heated,
The heat medium 9 melts or transitions and stores heat, and also transfers heat to the contents of the inner cylinder 1 to heat the contents. After the heating element 7 stops generating heat, thermal energy is stored in the heat transfer and storage layer 8 in the form of melting and transfer of the heat medium 9, and this occurs naturally in the contents of the inner cylinder 1. The temperature drop is significantly delayed, and the same effect as in the first embodiment can be obtained.

As explained above, the electrically heated vacuum double bottle according to this invention has an intermediate cylinder between the inner cylinder and the outer cylinder, a vacuum insulation layer between the intermediate cylinder and the outer cylinder, and a vacuum insulation layer between the inner cylinder and the outer cylinder. Since it has a heat transfer and heat storage layer formed by inserting a heat medium between it and the intermediate cylinder, it has very high heat retention and energy saving properties.

In order to confirm the effects of the present invention, the following experiment was conducted.

[Experiment example]

A conventional electrically heated vacuum double bottle with an internal capacity of 22 kg and an electrically heated vacuum double bottle with the structure shown in Figure 1 are filled with water and heated to 95 to 100°C, then the heating is stopped. After that, we measured the change in water temperature over time. As a result, after 24 hours, the temperature of the conventional product was 55°C or lower, but the temperature of the product of the present invention was 70°C to 75°C, confirming an improvement in heat retention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of this invention, and FIG. 2 is a sectional view showing a second embodiment of this invention. 1...Inner cylinder, 2...Intermediate cylinder, 3...Outer cylinder, 4...
...Heating medium, 5, 8... Heat transfer heat storage layer, 6... Vacuum insulation layer, 7... Heat generating element.

Claims (1)

[Claims for Utility Model Registration] (1) An inner cylinder, an intermediate cylinder, and an outer cylinder, each made of a metal material, are integrally fitted and connected one after another, and a vacuum is drawn between the intermediate cylinder and the outer cylinder to create vacuum insulation. A heat medium is inserted between the inner cylinder and the intermediate cylinder to form a heat transfer and heat storage layer, and heat is generated on the bottom outer surface of the intermediate cylinder in the heat transfer and heat storage layer or in the vacuum insulation layer. An electrically heated vacuum double bottle characterized by an attached body. (2) Utility model registration claim 1 characterized in that the heating medium is a medium that undergoes a phase change depending on the temperature.
Electric heating type vacuum double bottle as described in section.