JPS59115012A - Electric heat insulating pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric heating pot for heating and keeping a contained liquid warm.

Conventional structure and its problems Conventional electric heating pots have a lid on the top, a bottomed container with an open top, and an exterior body. A band-shaped heating element was wrapped around the container, and a temperature controller was installed at the bottom and outside of the middle part of the container.

In order to enhance the heat insulation effect, various flexible heat insulating materials such as glass fibers and ceramic fibers are wrapped around the outer periphery of the container, and metal reflective plates are also wrapped around the container. Ta.

However, since these materials are flexible fiber-based heat insulating materials, when wrapping them around containers, they are usually tied with strings or appropriate bands, which is extremely difficult to work with.
It was becoming a hindrance to my productivity.

In addition, it is common to install a band-shaped heating element on the lower outer periphery of the container, and the above-mentioned heat insulating material is often placed above the heating element and wrapped around the outer periphery of the container. As a result, it was not installed on the entire upper and lower outer peripheral surfaces of the container, resulting in a loss in heat retention efficiency.

The temperature controller was installed at a certain distance from the heating element at the middle of the body side of the container to ensure a good correlation between the heated liquid and the temperature controller. However, when the temperature controller is in this position, the temperature correlation will be significantly different depending on whether the liquid level is above or below the temperature controller, and it is necessary to pay attention to the minimum water volume from the standpoint of use. Ta.

In addition, it is necessary to remove the notch in the temperature controller part of the insulation material.
This only affected the heat retention effect.

Therefore, as a means to compensate for the above-mentioned decrease in heat retention effect, a metal heat shield plate has been wrapped around the entire outer periphery of the heat insulating material, but this has had the problem of increasing costs. Furthermore, although electrical wiring is generally concentrated at the bottom of the container, the band-shaped heating element is installed at the lower body of the container, and the temperature controller is installed at the bottom of the container. Because it is located in the middle of the side, the electrical lead wires are long and the assembly is complicated, leading to increased costs. Because it was a band-shaped heating element, the process of heating the liquid was to first heat the container and then transfer the heat from the heated container to the liquid, in other words indirect heating via the container. As a result, it cannot be said that the heating efficiency is good, and in order to suppress the temperature rise of the heating wire that is the heating element and guarantee the durable life of the heating element, the power density (w/c, 4) of the heating element must be The value must be kept below a certain level, and as a result, the absolute surface area of the heating element becomes large, resulting in high cost.

OBJECTS OF THE INVENTION The present invention aims to solve and improve the above-mentioned conventional drawbacks, and to provide an electric heating pot which can perform highly accurate temperature control, has high heat retention properties, and has good heating efficiency.

Structure of the Invention The present invention aims to achieve the intended purpose by providing a vacuum space between the double-layered exterior bodies, and providing a heating element and a temperature controller at the bottom of the inner body.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Explain in detail.

In the figure, 1 is a heat transfer plate with good thermal conductivity whose center part protrudes upward, and its outer peripheral part is liquid-tightly fixed to the lower end of the cylinder by base metal welding etc., forming a metal container 2. are doing. 3 is a metal exterior body that is airtightly fixed to the top and bottom of the container 2 with a space provided therebetween, and the space between the container 2 and the container 2 is in a vacuum state;
Inside the exterior body 3 (the wall surface has a getter material 4
is retained.

Below the heat exchanger plate 1 mentioned above, there is a heat generating plate 6 wrapped with heating wires.
is installed in a laminated state with insulating plates 6 and 7 on the top and bottom,
A through hole is provided in the center of each heat generating plate 6.

The whole of these is built into a highly thermally conductive metal heat diffusion plate 8 having a through hole in the center and having an outer circumferential side and a backing material 9 in a strongly compressed state to form the entire heating element part 1a. There is. ,
A heat shield plate 1o is provided below the heating element portion 1a, and a temperature controller 11 is installed below the center of the heat exchanger plate 1 with a mounting spring 12. A pouring part 14 is connected to the upper part of the container 2 and the exterior body 3 through a backing 13. A lid part 15 is placed, a handle 16 is fixed to the side of the exterior body 3, and a mounting bracket 17 is fixed to the bottom of the folding container 2, and a base 18 is connected thereto, and a predetermined electric circuit is formed. An electric heating pot has been completed. Note that the body of the container 2 and the exterior body 3 may be integrated, and the heating element portion 1a may be joined to the body.

In the above configuration, when a liquid is stored in the container 2 and electricity is started, the heating plate 5 is heated, heat is transferred to the liquid through the heat transfer plate 1, and at the same time, the heat is diffused toward the outer circumferential side through the heat diffusion plate 8. be done. The heat transferred to the backing material 9 is transferred to the outer peripheral side and is used to heat the liquid.

- When the liquid reaches a certain temperature, the temperature controller 11 connected to the central convex part of the heat exchanger plate 1 is activated, and the process moves to the warming stage. Since the heat dissipation of the heat generating plate 6 is carried out smoothly in this way, it is possible to reduce the temperature of the entire heat generating plate 6, extending its durability, and synergistically with the effect of the heat shield plate 1Q, the temperature controller 11 The ambient temperature in the vicinity is lowered, and the correlation between the liquid temperature and the operating temperature of the temperature controller 11 is made highly accurate. In addition,
Even in the case of dry baking with residual water due to misuse or dry baking from the initial state, the central convex part of the heat transfer plate 1 and the function of the heat diffusion plate 8 immediately transfer heat to the temperature controller 11, ensuring safety. It is something to do.

When the liquid reaches a certain temperature, since there is a vacuum between the walls of the exterior body 3 and the container 2, the heat retention effect is excellent and the liquid changes to the heat retention state very slowly.

Furthermore, the reservoir of hot liquid in the container 2, the exterior body 3 and the container 2
The getter material 4 between the vacuum walls also prevents the generation of gas, which lowers the degree of vacuum between the vacuum walls and deteriorates the heat retention effect.
adsorbs the generated gas, prevents the degree of vacuum from decreasing, and guarantees the heat retention effect.

Furthermore, since the heating element and temperature controller 11 are integrated at the bottom of the container, it is possible to extend the space between the vacuum walls to the bottom of the container as far as possible, and at the same time, it is possible to easily connect electrical wiring leads. It is possible to converge on the bottom of the container, reducing assembly man-hours and increasing heat retention performance.Instead of indirect heating using the conventional band-shaped heating element, the heat from the heating plate 5 is transferred to the heat transfer plate 1. It is transmitted more directly to the liquid and provides good heating efficiency.

Effects of the Invention As described above, according to the present invention, it is possible to provide an electric heating pot that has high precision in liquid temperature and temperature correlation, good heating efficiency, excellent heat retention ability, is generally low in cost, and has high industrial value. It is something that can be done.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an electric heat-retaining pot showing one embodiment of the present invention, and FIG. 2 is a sectional view of the main components thereof. 1...Heat exchange plate, 2...--Container, 3...
... Exterior body, 6 ... Heat generating board, 8 ...
Heat diffusion plate. Name of agent: Patent attorney Toshio Nakao Haga 1st person
2 Figure

Claims (1)

[Claims] An electric heat-insulating pot formed by sealing the bottom of a container with a vacuum layer formed between it and an exterior body using a heat-generating element held between a heat transfer member and a heat diffusion member.