JPS6250137B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric heat-retaining pot that heats a liquid contained in a container with a heating element and keeps it warm.

Structure of the conventional example and its problems A conventional electric heat-retaining pot includes a bottomed container with a lid installed at the upper end opening, and an exterior body in which the bottomed container is installed, and a lower outer periphery of the bottomed container A band-shaped heating element was wrapped around the container, and temperature controllers were installed at the bottom and sides of the container. In order to increase the heat retention effect, various flexible heat insulating materials and metal reflective plates were wrapped around the outer periphery of the container. However, since this configuration uses a flexible heat insulating material, when wrapping this flexible heat insulating material around the outer periphery of the container, it must be connected with strings, bands, etc. Workability was extremely poor and was an obstacle to productivity. In addition, since the band-shaped heating element is installed at the lower outer periphery of the container, when wrapping the flexible heat insulating material around the outer periphery of the container, it should be wrapped above the band-shaped heating element. As a result, the flexible heat insulating material is not located on the entire upper and lower outer circumferential surfaces of the container, so the heat retention efficiency is not very good. In addition, the temperature controller was installed at a certain distance from the heating element's mounting position, and the temperature controller was installed at an intermediate position on the body side of the container, in order to maintain a correlation with the liquid to be heated. However, in this configuration, the temperature correlation is markedly different when the liquid level in the container is above and below the temperature controller, and therefore caution is advised regarding the minimum amount of water during use. The need arose. Furthermore, the heat insulating material wrapped around the outer periphery of the container had to be removed by cutting out the portion where the temperature controller was located, which affected the heat retaining effect accordingly. Conventionally, as a means to compensate for this 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 led to an increase in costs. Furthermore, electrical wiring is generally concentrated at the bottom of the container, but the band-shaped heating element is installed in the lower body of the container, and the temperature controller is installed in the lower part of the container. Since it is located in the middle of the body side of the container, the lead wires for electrically connecting them are long, and as a result, the assembly becomes complicated, causing an increase in costs. The band-shaped heating element also has good heating efficiency because it first heats the container and then transfers the heat from the heated container to the liquid, which is indirect heating via the container. It cannot be said that heating efficiency is high, 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/cm ² ) of the heating element must be below a certain level based on experience. As a result, the absolute surface area of the heating element becomes large, resulting in high costs.

In addition, as another conventional example that has almost improved the above-mentioned drawbacks, as seen in Japanese Utility Model Application Publication No. 58-4332, there is a vacuum-based product that increases heating efficiency and minimizes the decrease in vacuum degree and heat loss. A double container, that is, a vacuum double container with a vacuum chamber between the inner container and the outer container, and an open top and bottom, with a ceramic heating element hermetically sealed in the bottom opening. However, ceramic heating elements in this case are more expensive than band-shaped heating elements or sheathed heaters, and if a metal container is used, the linear expansion coefficients of ceramic and metal are significantly different. At the same time, due to initial deformation of ceramic, etc.
Hermetic sealing is not easy, and ceramic heating elements have a limited thermal shock resistance, resulting in an overall high cost.

Purpose of the Invention The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide an electric heating pot that can provide high heat retention, good heating efficiency, and highly accurate temperature control. This is the purpose.

Structure of the Invention In order to achieve the above object, the present invention includes a container with an open top end, and an exterior body housing the container and forming a vacuum layer between the body and the bottom of the container. , forming a small opening in the bottom of the container, and extending the vacuum layer to the bottom opening;
The bottom opening of the container is hermetically sealed by attaching a heating element sandwiched between a metal heat transfer member and a metal heat diffusion member to the inner bottom surface of the container;
In addition, a temperature controller is provided below the center of the heating element section, and this temperature controller is placed close to the bottom opening of the container. According to this configuration, the connection between the body and bottom of the container and the exterior body is By forming a vacuum layer in between, and by making the opening formed at the bottom of the container into a small opening, and by extending the vacuum layer to the bottom opening, it is possible to guarantee extremely high heat retention performance. Heat transfer to the liquid is carried out directly by the heat transfer member and the heat diffusion member, and heat dissipation from the container to the exterior body can be reliably prevented by the vacuum layer, so good heating efficiency can be obtained. Furthermore, since the temperature controller is provided below the center of the heating element and close to the bottom opening of the container, the temperature of the liquid in the container can be controlled with high precision.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, 1 is a metal container, this container 1 forms a vacuum layer 3 between it and the exterior body 2, and the mouth 4 and the bottom 5 are hermetically sealed together, and the mouth 4 and the bottom Openings 4a and 5a are formed in each of the holes 5, respectively. 6 is a getter substance held on the inner wall surface of the exterior body 2; 7 is a metal heat transfer member having good thermal conductivity with a central portion protruding upward; A heating plate 8 wrapped with hot wire has insulating plates 9 above and below it.
10 are installed in a stacked state, and a through hole 8a is provided in the center of the heat generating plate 8.
Reference numeral 11 denotes a metal heat diffusion member having a through hole 11a in the center and an annular side portion 11b on the outer periphery. is holding. 12 is the backing material,
By fixing this backing material 12 to the heat transfer member 7, the heat generating plate 8 and the heat diffusion member 11 are built into the heat transfer member 7 in a strongly compressed state, and the heat generating body portion 13 is fixed to the heat transfer member 7.
The heating element part 13 is arranged in the opening 5a of the bottom 5 of the container 1, and the outer periphery of the heat transfer member 7 and the bottom 5 of the container 1 are made airtight by welding or brazing. The bond is fixed.

Reference numeral 14 denotes a temperature controller disposed on the lower surface of the center of the heat transfer member 7, and this temperature controller 14 is connected to the mounting spring 15.
The lower surface of the center of the heat transfer member 7 is pressed against the lower surface of the heat transfer member 7. Further, the vacuum layer 3 extends to an opening 5a formed in the bottom 5 of the container 1, and the vacuum layer 3 extends to the opening 5a formed in the bottom 5 of the container 1.
The opening a is small enough to accommodate the temperature controller 14, and the temperature controller 14 is placed close to the bottom opening 5a. A spout 17 and a lid 18 are placed on the upper part of the container 1 and the exterior body 2 via a packing 16, and a handle 19 is fixed to the side of the exterior body 2. A mounting bracket 20 is fixed to the bottom of the holder, and a base 21 is connected to the mounting bracket 20, and a predetermined electric circuit is formed.

The operation in the above configuration will be explained. When a liquid is stored in the container 1 and electricity is started to be applied to the heating element section 13, the heating plate 8 is heated and heat is transferred to the stored liquid through the heat transfer member 7. At the same time, heat is transferred to the outer peripheral side 1 of the heat diffusion member 11 through the heat diffusion member 11.
It is diffused in the direction of 1b and transmitted to the backing material 12. The heat transferred to the backing material 12 is transferred to the outer peripheral side of the heat transfer member 7 and is used to heat the contained liquid.

When the temperature of the stored liquid reaches a certain temperature,
The temperature controller 14 disposed on the lower surface of the central convex portion of the heat transfer member 7 is activated, and a transition is made to the heat retention stage. In this way, the heat dissipation of the heat generating plate 8 is carried out smoothly by the heat transfer member 7, the heat dispersion member 11, and the backing material 12, so that it is possible to lower the temperature of the entire heat generating body part 13, and as a result, the durability is increased. It is something that can extend your lifespan. Furthermore, by lowering the back surface temperature of the heating element section 7, the ambient temperature near the temperature controller 14 can be lowered.
This allows the correlation between the liquid temperature and the operating temperature of the temperature controller 14 to be highly accurate.

In addition, even in the case of dry firing with a small amount of residual water due to misuse or dry firing from the initial state, the heat transfer member 7 and the heat diffusion member 11 work to immediately transfer the heat to the temperature controller 14 to ensure safety. This can be guaranteed.

Furthermore, the liquid that has reached a certain temperature is placed in a vacuum layer 3 between the walls of the container 1 and the exterior body 2, except for the opening 5a of the bottom 5.
, the vacuum layer 3 maintains a constant temperature. It should be noted that the opening 5a of the bottom part 5 only needs to be large enough to draw out the lead wire of the heating element part 13 and to install the temperature controller 14, so that it has almost no effect on the heat retention performance.

Furthermore, various gases are generated from the container 1 and the exterior body 2 due to the heated liquid in the container 1, which may reduce the degree of vacuum in the vacuum layer 3. In this case, the inner wall surface of the exterior body 2 Since the getter substance 6 held in the chamber adsorbs the generated gas, a decrease in the degree of vacuum is prevented and the heat retention effect is guaranteed.

Furthermore, the heating element section 13 and the temperature controller 14
Since the wiring leads for electrical connection are concentrated at the bottom of the container 1, it is possible to easily converge the wiring leads for electrical connection at the bottom of the container 1. As a result, it is possible to reduce assembly man-hours and to reduce heat generation. Since the heat of the disk 8 is directly transferred to the liquid by the heat transfer member 7 and the heat diffusion member 11, good heating efficiency can be obtained.

Effects of the Invention As described above, the present invention includes a container with an open top end, and an exterior body containing the container and forming a vacuum layer between the body and the bottom of the container, A small opening is formed at the bottom of the container, the vacuum layer is extended to the bottom opening, and a heating element sandwiched between a metal heat transfer member and a metal heat diffusion member is attached to the inner bottom surface of the container. By attaching it, the bottom opening of the container is hermetically sealed, and a temperature controller is provided below the center of the heating element part, and the temperature controller is placed close to the bottom opening of the container, A vacuum layer is formed between the body and bottom of the container and the exterior body, and the opening formed at the bottom of the container is a small opening, and the vacuum layer extends to the bottom opening, resulting in extremely high heat retention. The performance can be guaranteed, and the heat transfer to the liquid in the container is carried out directly by the heat transfer member and the heat diffusion member, and heat dissipation from the container to the exterior body can be reliably prevented by the vacuum layer. , good heating efficiency can be obtained, and since the temperature controller is installed below the center of the heating element and close to the bottom opening of the container, the temperature of the liquid inside the container can be controlled with high precision. That's what you get.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an electric heat-retaining pot showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main part of the pot. 1... Container, 2... Exterior body, 3... Vacuum layer, 5
...bottom, 5a...bottom opening, 7...heat transfer member,
8...Heating plate, 11...Heat diffusion member, 13...Heating element part, 14...Temperature controller.

Claims (1)

[Claims] 1. A container with an open top, and a container with an interior,
and an exterior body in which a vacuum layer is formed between the body and the bottom of the container, a small opening is formed in the bottom of the container, the vacuum layer extends to the bottom opening, and the container is made of metal. A heating element sandwiched between a heat transfer member and a metal heat diffusion member is attached to the inner bottom surface of the container, thereby airtightly sealing the bottom opening of the container, and An electric heating pot which is provided with a temperature controller and which is located close to the bottom opening of the container.