JPS6329459Y2 - - Google Patents

Description

[Detailed Description of the Invention] Field of the Invention The present invention relates to a heating container, and particularly to a heating container whose contents can be heated by a ceramic heater having a high watt density.

BACKGROUND ART Conventionally, as a heating container, a band heater is attached to the outer periphery of the bottom of a metal container, and the contents are heated by the band heater.
In this type of heating container, mica heaters or sheathed heaters are generally used as heaters, but in either case, the watt density is small;
It has the disadvantage of increasing size and cost.

Therefore, it is conceivable to attach a ceramic heater with a high watt density to the bottom of a metal container, which can obtain large power even with a small size and reduce costs. However, in this case, if cold water was poured into the container during heating, the ceramic heater would cool down rapidly, and the ceramic heater would break due to the heat shock.

Therefore, by bonding and fixing a metal member with good heat conductivity to the outer surface of the bottom of the metal container and crimping the ceramic heater to the outer surface of this metal member, the metal member softens the thermal shock and prevents the ceramic heater from cracking. I can think of something that happened. However, in this case, the bottom of the container tends to sag outward during normal heating, and tends to sag inwardly during dry cooking. The contact with the parts becomes poor, and as a result,
There was a problem that the ceramic heater itself would become abnormally hot and crack.

Purpose of the invention The present invention was devised in view of the above-mentioned conventional problems, and aims to provide a heating container that has a large heating capacity despite its small size and can prevent ceramic heaters from cracking due to abnormal temperature rises. .

Structure of the Invention In order to achieve the above object, the present invention involves bonding and fixing a thermally conductive metal member to the outer surface of the bottom of a metal container, and attaching a thermally conductive intermediate metal plate to the outer surface of the metal member. A ceramic heater is crimped onto the ceramic heater.

Embodiment Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a stainless steel container, which is an example of a metal container, and has a body 2 and a bottom 3, which are separate bodies, welded together at the periphery. Above bottom part 3
In order to reinforce the bottom part, a plurality of concentric steps 3a to 3c are formed with a step-like depression in the center, and a predetermined metal member, which is an example of a metal member, is formed on the outer surface of the center step 3a. An aluminum plate 4 having a thickness (for example, 4 mm) is bonded and fixed. This aluminum plate 4 has one side attached to the center step 3a of the bottom 3 of the container 1.
Pressure and heat are applied to join and fix by hot welding such as clad welding, and then the outer surface is polished or cut to obtain flatness.

An intermediate metal plate 5 made of an aluminum plate and a ceramic heater 6 are provided on the outer surface of the aluminum plate 4.
A heater unit 8, in which a back metal plate 7 made of an aluminum plate and a rear metal plate 7 are fixed together, is crimped by a presser spring 9. That is, the back of the presser spring 9 is supported by a presser plate 10, and this presser plate 1
The heater unit 8 is brought into contact with the aluminum plate 4 with a predetermined pressure force by screwing both ends of the heater unit 8 to mounting screw seats 11 fixed to the intermediate step 3b of the bottom 3 of the container 1. Ceramic heater 6
For example, a thin ceramic substrate mainly composed of alumina is formed in a semi-dry state, a circuit consisting of a heater wire, a temperature control sensor, etc. is printed on the top surface, and a thin ceramic layer is placed above and below it. , the lower part was laminated in multiple layers and molded, and the whole was fired with the lead wires exposed to the outside. Note that the ceramic heater 6 and the metal plates 5, 7 may be fixed integrally as described above, or may be separated.

In the heating container constructed as described above, the content liquid stored in the container 1 is heated by the ceramic heater 6 via the intermediate metal plate 5, the aluminum plate 4, and the bottom portion 3. At this time, the intermediate metal plate 5 and the aluminum plate 4 have good thermal conductivity,
In addition, since the aluminum plate 4 and the intermediate metal plate 5 are in close contact with each other by the spring force of the presser spring 9, the heat transfer property is extremely good. In addition, the press and
Even if there is distortion in the bottom part 3 due to welding etc. or distortion when joining and fixing the aluminum plate 4, by later polishing or cutting the outer surface of the aluminum plate 4, flatness can be obtained regardless of the above distortion, and the intermediate Adhesion between the metal plate and the aluminum plate can be improved.

Furthermore, when the remaining amount of the content liquid kept at a predetermined temperature (for example, 90°C) becomes low, when cold water is replenished into the container 1, the bottom part 3 of the container 1 is rapidly cooled due to the cold water, and the ceramic heater There is a risk of giving a heat shock to 6. However, since the aluminum plate 4 and the intermediate metal plate 5 are interposed between the bottom part 3 and the ceramic heater 6, the thermal shock is softened by the heat capacity of the aluminum plate and the intermediate metal plate, and the ceramic heater 6 cracks can be prevented.

Furthermore, during normal heating, the upper surface of the bottom 3 of the container 1 is lower than the lower surface of the aluminum plate 4, which receives heat from the ceramic heater 6, so the bottom 3 and the aluminum plate 4 are arranged so that the bottom is convex. On the other hand, since the container 1 is overheated during empty cooking, there is a tendency for the container 1 to sag inward so that the bottom becomes concave as shown in FIG. If the ceramic heater 6 is in direct contact with the aluminum plate 4, the ceramic heater 6 and the aluminum plate 4 will come into local contact during the external sagging and internal sagging as described above, and the heat of the ceramic heater 6 will be There is a problem in that the heat is not sufficiently transmitted to the aluminum plate 4, and as a result, the ceramic heater 6 itself experiences an abnormal temperature rise and cracks. However, in the present invention, an intermediate metal plate 5 is placed between the ceramic heater 6 and the aluminum plate 4.
is interposed, and this intermediate metal plate 5 is an aluminum plate 4
Since the intermediate metal plate is in surface contact with the ceramic heater 6 regardless of the deformation of the metal plate, the heat of the heater 6 is dissipated by this intermediate metal plate, and cracking of the ceramic heater 6 due to an abnormal temperature rise can be prevented. Furthermore, deformation and distortion of the bottom 3 of the container 1 and the aluminum plate 4 are not transmitted to the ceramic heater 6 due to the interposition of the intermediate metal plate 5, and no bending moment is applied to the ceramic heater 6.

In addition, as in the above embodiment, the ceramic heater 6
The reason why the back metal plate 7 is provided behind the ceramic heater 6 is to equalize the spring pressure of the presser spring 9 that presses the back of the ceramic heater 6 and to eliminate variations in heater temperature. Since the heater unit 8 is constructed by integrally sandwiching the ceramic heater 6 between the back metal plate 7 and the intermediate metal plate 5, parts management becomes easy and assembly work is also simplified.

Further, the reason why the joint surface between the aluminum plate 4 and the intermediate metal plate 5 was polished and the aluminum plate 4 was bonded and fixed to the bottom part 3 by hot pressure welding is as follows. Generally, the resistance value of the heater wire of the ceramic heater 6 has a property of increasing as the heater temperature rises. If the adhesion between the bottom part 3 and the bottom part 3 is poor, the heat from the ceramic heater 6 will be transferred to the bottom part 3.
The ceramic heater 6 itself will be overheated. If this happens, the resistance value of the ceramic heater 6 will also increase, and together with the above-mentioned poor heat transfer, the content liquid will not be sufficiently heated considering the power consumption. Therefore, as described above, the bottom part 3, the aluminum plate 4, the intermediate metal plate 5, and the ceramic heater 6 are connected.
By increasing the adhesion with the ceramic heater 6, the temperature rise of the ceramic heater 6 is suppressed, heat is generated efficiently, and the heat transfer coefficient is improved, allowing the small ceramic heater 6 to exhibit large heating capacity. be.

As shown in the drawings, a recess 4a is formed in the center of the outer surface of the aluminum plate 4. This is because the bottom part 3 and the aluminum plate 4 are thermally deformed so as to convex downward during heating, which tends to push the ceramic heater down and cause it to crack or cause poor adhesion.
This is to reduce this influence.

In addition, when the metal member 4 is made of aluminum, the bottom part 3 is formed by hot welding as in the above embodiment.
For example, the metal member 4 may be bonded and fixed to the outer surface of the bottom portion 3 by die casting. In this case as well, after fixing the metal member 4,
The outer surface may be polished or cut. Further, the metal member 4, the intermediate metal plate 5, and the back metal plate 7 may be made of any metal that has good thermal conductivity, and may be made of copper, for example, in addition to aluminum.

The container according to the present invention is not limited to a simple single layer container as in the above embodiment, but may also be an insulated single layer container or vacuum double container with a heat insulating material wrapped around the outer circumferential surface, and in the case of a vacuum double container, In this case, only the bottom part can be made single layered and a ceramic heater can be attached to this bottom part.

Effects of the invention As described above, in the present invention, a metal member with good thermal conductivity is bonded and fixed to the outer surface of the bottom of a metal container, and a ceramic heater is crimped to this metal member via an intermediate metal plate. Even if cold water is poured into the container midway through, the heat shock will be softened by the metal parts and the ceramic heater will not break. Since heat is appropriately dissipated by the plate, an abnormal temperature rise in the ceramic heater is prevented, and cracking of the ceramic heater can be prevented. Further, since the metal member and the intermediate metal plate have good thermal conductivity, the heat of the ceramic heater having a high wattage density is efficiently transmitted to the bottom of the container, and the thermal efficiency is also good.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an example of the heating container according to the present invention, and FIG. 2 is a partially enlarged cross-sectional view during dry cooking. DESCRIPTION OF SYMBOLS 1... Metal container, 3... Bottom, 4... Metal member, 5... Intermediate metal plate, 6... Ceramic heater, 7... Back metal plate, 8... Heater unit,
9... Presser spring.

Claims (1)

[Claims for Utility Model Registration] (1) A metal member with good thermal conductivity is bonded and fixed to the outer surface of the bottom of a metal container, and a ceramic heater is attached to the outer surface of the metal member via an intermediate metal plate with good thermal conductivity. A heating container characterized by being crimped. (2) The intermediate metal plate and the ceramic heater are fixed, and a back metal plate with good thermal conductivity is fixed to the back side of the ceramic heater, and a heater unit is constituted by these two metal plates and the ceramic heater. A heating container according to claim 1 of the utility model registration claim. (3) The heating container according to claim 1 or 2, wherein a recess is formed in the center of the outer surface of the metal member.