JPH0241327B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric heating pot that heats and keeps a contained liquid warm.

Conventional configuration and its problems Conventional electric heating pots have a lid on the top,
It has a double structure consisting of a bottomed container with an open top and an exterior body, and a band-shaped heating element is wrapped around the lower outer periphery of the bottomed container, and a temperature controller is installed on the outside of the bottom and middle part of the container. was installed.

Furthermore, in order to enhance the heat insulation effect, that is, the heat retention effect, various flexible heat insulating materials, such as glass fibers and ceramic fibers, have been wrapped around the outer periphery of the container, or metal reflective plates have been similarly wrapped around the container.

However, the electric heat-retaining pot having the above-mentioned structure had the following drawbacks.

(1) When wrapping flexible heat insulating materials around the body of a container, it is customary to connect them with strings or appropriate bands, which is extremely inefficient and hinders productivity.

(2) Since a band-shaped heating element is used, the insulation material is often wrapped around the container above the band-shaped heating element, and does not cover the entire upper and lower outer circumferential surfaces of the container, resulting in a loss in insulation efficiency. It was becoming.

(3) Because the temperature controller is located in the middle of the body side of the container, the temperature correlation is significantly different when the water level of the stored liquid is above and below the temperature controller, necessitating caution when using it.

(4) Electrical wiring is also generally concentrated at the bottom of the container, but the electrical lead wires from the temperature controller and band-shaped heating element to the bottom of the container are long, making it difficult to assemble. complex and costly.

(5) Since the stored liquid is heated indirectly through the container, good heating efficiency is not achieved, and in order to suppress the temperature rise of the heating wire, which is the heating element, and guarantee its durable life, the power density of the heating element must be adjusted. (W/cm ² ) must be kept below a certain level based on empirical values, and as a result, the absolute surface area of the heating element becomes large, leading to high costs.

(6) For the lead wire extraction part of the heating element, connect the extension wire closely from the end of the heating wire of the heating element part, fold it back or twist it into multiple layers, insert the insulator tube, and lead it out to the outside. As a result, the overlapping part of the heating wire and the attachment wire separates due to the degree of closeness between the heating wire and the attachment wire, vibration during use, external force, etc., resulting in large oxidation and fatigue, and an increase in the self-heating amount of the drawer part. I have experienced many disconnections and failures in parts.

OBJECTS OF THE INVENTION The present invention aims to solve and improve the above-mentioned deficiencies in the conventional art, and to provide an electric heat-retaining pot that performs highly accurate temperature control, has high heat retention properties, good heating efficiency, and high productivity.

Structure of the Invention In order to achieve the above object, the present invention has a structure in which a vacuum space is formed between the inner and outer bodies of the double structure, and a heating element and a temperature controller are provided at the bottom of the container of the inner body. It achieves the intended purpose based on its composition.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

In the figure, 1 is a heat transfer plate made of a metal material with good thermal conductivity and whose center part protrudes upward. A container 2 is formed. 3 is container 2
This is a metal exterior body whose top and bottom are airtightly fixed with a space provided therein, and this space is kept in a vacuum state, and a getter substance 4 is held on the inner wall surface of the exterior body 3.

Below the heat exchanger plate 1 described above, there is a heat generating board 5 in which a main heat generating part and an auxiliary heat generating part are integrally wrapped around an insulating substrate with heating wire.
is installed in a laminated manner with insulating plates 6 and 7 on the top and bottom, and a through hole is provided in the center of each heating plate 5, and thin plates are installed at the ends of the heating wires of the main and auxiliary heating elements. substantially L-shaped conductive terminal plates 8 and 9 are fixed,
and has been extended. All of these are built into a heat diffusion plate 10 and a backing material 11 made of a metal material with good thermal conductivity, which have a through hole in the center and the other end and have an outer circumferential side, and are tightly bonded together. Insulating bodies 12 are inserted into the conductive terminal plates 8 and 9, and the conductive terminal plates 8 and 9 including the insulating bodies 12 pass through the through hole at the other end of the heat diffusion plate 10, and through the through hole at the other end of the backing material 11. The insulating solid body 12 is press-locked at the stepped portion of the section to form the entire heating element section 1a. A heat shield plate 13 is provided below the heating element portion 1a, and a temperature controller 14 is mounted under pressure by a mounting spring 15 below the center of the heat transfer plate 1. A spout 17 and a lid 18 are connected to the upper part of the container 2 and the exterior body 3 through a packing 16.
is mounted, and a handle part 1 is placed on the side of the exterior body 3.
9, a mounting bracket 20 is fixed to the bottom of the container 2, a base 21 is connected thereto, and a predetermined electric circuit is formed to complete the electric heat-insulating pot. The electrical connection method using the extended terminal plates 8 and 9 as shown in Fig. 5 allows tabs, plates, round wires, etc. to be easily connected to the terminal plates 8 and 9, and the It may be selected appropriately depending on the configuration.

In the above configuration, a liquid is stored in the container 2,
When electricity starts, the heat generating plate 5 of the main heat generating section 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 peripheral side through the heat diffusion plate 10. The heat transferred to the backing material 11 is transferred to the outer peripheral side and is used to heat the liquid. When the liquid reaches a certain temperature, the temperature controller 14 connected to the central convex part of the heat exchanger plate 1 is activated, and only the small auxiliary heat generating part is energized, thereby transitioning to the heat retention stage in which the temperature is maintained at an appropriate temperature. Since the heat dissipation of the heat generating plate 5 is performed smoothly in this way, it is possible to lower the temperature of the entire heat generating plate 5 (heating wire temperature), extending the durability life, and increasing the temperature of the heat shield plate 13.
Combined with this effect, the ambient temperature near the temperature controller 14 is lowered, and as a result, the correlation between the liquid temperature and the operating temperature of the temperature controller 14 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 10 immediately transfer heat to the temperature controller 14 to ensure safety. It is something to do. In addition, when the liquid reaches a certain temperature, there is a vacuum between the interior and exterior body walls, so the heat retention effect is excellent, and minimal heat retention power is required to maintain the appropriate temperature.
Furthermore, gas is generated from the exterior body 3 and the container 2 because it is a hot liquid, and the heat retention effect decreases due to the deterioration of the vacuum between the vacuum walls.The gas adsorption effect of the getter substance 4 prevents the deterioration of the vacuum and keeps the heat It is guaranteed to be effective. Furthermore, since the heating element and temperature controller 14 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 converge the electrical wiring leads to the bottom of the container. It is possible to reduce assembly man-hours and achieve high heat retention performance, and instead of indirect heating of the conventional band-shaped heating element, the heat of the heating plate 5 is directly transferred to the liquid from the heat transfer plate 1, resulting in good heating efficiency. This is what you get.

Furthermore, as mentioned above, at the same time as the wire temperature of the heating wire itself decreases, since the insulating solid 12 presses and locks the terminal boards 8 and 9 and the heating wire joint part, the temperature of this part and the entire terminal board decreases. Furthermore, it is possible to prevent oxidation of the terminal plates 8 and 9, and damage and failure from vibrations, external forces, etc.

Effects of the Invention As is clear from the description of the above embodiments, the electric pot of the present invention connects the bottom of the container with a vacuum layer formed between the exterior body and the heat transfer member made of a metal material with good thermal conductivity. A heat generating element sandwiched between a diffusion member and a backing member is sealed, a temperature controller is press-fitted to the heat transfer member, a conductive terminal plate is fixed and led out to the heat generating element, and the conductive terminal An insulating solid body is inserted into the plate to press and lock the joint between the heat generating element and the conductive terminal plate. With the above configuration, when electricity is started, the heat generating element is heated, and the liquid in the container is transferred through the heat transfer member. At the same time, the heat is quickly diffused to the outer circumferential side through the heat diffusion plate with good thermal conductivity, and is used to heat the liquid, so the temperature of the heating wire of the heating element decreases significantly, and its durability increases. Lifespan can be extended.
In addition, since the insulating solid presses and locks the joint between the conductive terminal board and the heat generating element, it is possible to reduce the temperature of the joint and the entire conductive terminal board. Breakage of the wire lead-out portion can be prevented. Furthermore, even in the case of dry firing due to residual water due to misuse or dry firing from the initial state, due to the function of the heat transfer member and heat diffusion member made of metal materials with good thermal conductivity,
Heat can be transferred to the temperature controller immediately and safety can be guaranteed. Furthermore, since there is a vacuum between the exterior body and the container, the heat retention effect is excellent, and because it uses a direct heating method that transfers the heat from the heat generating element directly to the liquid in the container from the heat transfer member. It has various excellent effects such as being able to improve heating efficiency.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electric heat-retaining pot showing an embodiment of the present invention, Fig. 2 is a sectional view of its essential components, Fig. 3 is a top view of the heat generating plate of the constituent parts, and Fig. 4 is a heat generating plate. FIGS. 5A and 5B are perspective views showing applied embodiments of the components of the heating plate, respectively. 1... Heat exchanger plate, 2... Container, 3... Exterior body, 5
... Heat generating board, 8, 9 ... Terminal board, 10 ... Heat diffusion plate, 12 ... Insulating solid, 11 ... Back material.

Claims (1)

[Claims] 1. Seal the bottom of the container with a vacuum layer formed between it and the exterior body with a heating element constructed by sandwiching a heat transfer member made of a metal material with good thermal conductivity, a heat diffusion member, and a backing material; A temperature controller is press-installed on the heat transfer member, a conductive terminal plate is fixed and led out to the heat-generating element, and an insulating body is attached to the conductive terminal plate to press and lock a joint between the heat-generating element and the conductive terminal plate. Inserted electric heating pot.