JPS59230512A - Heat insulating electric 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 bundle-shaped heating element was wrapped around the container, and temperature controllers were installed at the bottom and outside of the middle part of the container.

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, and a metal reflective plate has also been wrapped around the outer periphery of the container.

However, the electric heat-retaining pot with the above-mentioned configuration. It had the following drawbacks.

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

(2) Since a hand-shaped heating element is used, the heat insulating material is often wrapped around the container above the band-shaped heating element.
The entire upper and lower outer circumferential surfaces of the container were not covered, resulting in a loss in heat retention efficiency.

(3) Because the temperature controller is located in the middle of the body side of the container, if the water level of the stored liquid is above or below the temperature controller, the temperature correlation will be significantly different, and it is necessary to be careful when using it. Ta.

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

(6) 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 (w/, , 7) must be kept below a certain level based on empirical values, and as a result, the absolute surface area of the heating element becomes too small, resulting in high costs.

(6) To draw out the lead wires of the heating element, connect the extension wires closely from the heating wire ends of the heating element part, and insert the insulator tube into multiple layers by folding, sizing, and twisting, and lead them out to the outside. Because of this, due to the closeness of the heating wire and the attachment wire, vibration during use, external forces, etc., the overlapped part of the attachment wire may separate, resulting in large oxidation and fatigue, and the self-heating amount of the drawer part. Due to the increase in the number of wires, we have experienced many disconnections and failures in this part.

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

Structure of the Invention In order to achieve the above object, the present invention has a structure in which a vacuum space is created 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 with reference to the accompanying drawings.

In the figure, numeral 1 is a heat transfer plate with good thermal conductivity whose central part protrudes upward, and its outer periphery is liquid-tightly fixed to the lower end of the cylindrical body by base metal welding, etc., and a metal container 2 is attached. is forming. Reference numeral 3 denotes a metal exterior body that is airtightly fixed to the container 2 from above and below with a space provided therein. 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. There is.

Below the heat exchanger plate 1 described above, a heat generating board 5 is installed in which a main heat generating part and an auxiliary heat generating part are integrally wrapped around an insulating substrate with heating wires, and the heat generating board 5 is laminated with insulating plates 6 and 7 on the top and bottom. A through hole is provided in the center of the heating plate 6, and thin conductive terminal plates 8, 9 are provided at the ends of the heating wires of the main and auxiliary heating elements.
is fixed and extended. All these are built in in a strongly crimped state with a metal heat diffusion plate 10 having good thermal conductivity and a backing material 11 having a through hole in the center and the other end and having an outer peripheral side part 9, and the terminal Insulating solid 1 on plates 8 and 9
The terminal plates 8 and 9 containing the insulating bodies 12 into which the terminal boards 2 are inserted pass through the through-holes at the other end of the heat diffusion plate 10, and press the insulating bodies 12 at the stepped portion of the through-holes at the other end of the backing material 11. The heating element portion 1a is stopped as a whole. A heat shield plate 13 is provided below the heating element portion 1a, and a temperature controller 14 is mounted below the center of the heat transfer plate 1 and is pressed by a mounting spring 15.

A spout 17 and a lid 18 are placed on the top of the container 2 and the exterior body 3 via a backing 16, a handle 19 is placed on the side of the exterior body 3, and a handle 19 is placed on the bottom of the container 2. Mounting bracket 20
are fixed, the base 21 is connected, and a predetermined electric circuit is formed to complete the electric heat-insulating pot. Note that the electrical connection method using the extended terminal plates 8 and 9 as shown in FIG. 5 makes it possible to easily connect tags, plates, round wires, etc. to the terminal plates 8 and 9. It may be selected appropriately depending on the vessel configuration.

In the above configuration, when a liquid is stored in the container 2 and electricity is started, the heat generating plate 5 of the main heat generating part is heated, heat is transferred to the liquid through the heat transfer plate 1, and at the same time, the heat is transferred to the liquid through the heat diffusion plate 10 toward the outer peripheral side. heat is diffused to

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 synergizing with the effect of the heat shield plate 13. This lowers the ambient temperature near the temperature controller, 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 if there is a problem during dry-firing with residual water due to misuse or dry-firing from the initial state, the central convex part of the heat transfer plate 1 and the function of the heat diffusion plate 10 will immediately transfer heat to the temperature controller 14 and ensure safety. This guarantees that Furthermore, since the liquid that has reached a certain temperature is in a vacuum state between the interior and exterior body walls, it has an excellent heat retention effect, and an extremely small amount of 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, but the gas adsorption effect of the getter material 4 prevents the vacuum from deteriorating It is guaranteed to be effective.

Furthermore, the heating element part and the temperature controller 14 are located at the bottom of the container 4.
Because it is integrated into one section, it is possible to extend the space between the vacuum walls as far as possible to the bottom of the container, and at the same time, it is possible to easily converge the electrical wiring leads to the bottom of the container, reducing assembly man-hours and achieving high heat retention performance. It is possible to realize this method, and instead of indirect heating using the conventional band-shaped heating element, the heat of the heating plate 5 is directly transferred to the liquid through the heat transfer plate 1, and good heating efficiency is obtained.

Furthermore, as mentioned above, at the same time as the wire temperature of the heating wire itself decreases, the insulating solid 12 suppresses and locks the terminal plates 8, 9 and the heating wire joint part, so that the temperature of the core part and the entire terminal plate decreases. Furthermore, it is possible to prevent oxidation of the terminal plate 8.9 and damage and failure from vibration, external force, etc.

Effects of the Invention As is clear from the description of the embodiments above, the present invention has a high liquid temperature correlation, good heating efficiency, excellent heat retention ability, easy assembly, overall low cost, and high industrial value. Electric heating box 5. It is possible to provide the following benefits.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an electric heat-retaining bot showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the essential components, Fig. 3 is a top view of the heat generating board of the constituent parts, and Fig. 4 is a heat generating board. 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. Name of agent: Patent attorney Toshio Nakao 1”tka・1
Figure 1 tt rσ/42ρR) Figure 3 Figure 4 Figure 5 Mouth

Claims (1)

[Claims] A conductive terminal in which the bottom of a container with a vacuum layer formed between it and an exterior body is sealed with a heating element constructed by sandwiching a heat transfer member, a heat diffusion member, and a backing material, and an insulating solid is inserted into the heating element. An electric heat-retaining pot made from a fixed board.