JPH09201281A - Conduction heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat exchange between heating metal and liquid by providing a gap of a prescribed interval between a heating metal plate and a glass vacuum double vessel and providing a hole or a slit on the heating metal plate. SOLUTION: By making the heating metal planar and providing a gap more than 0.5mm between the metal and a heat insulating vessel, a liquid also touches the downside of a heating metal plate 17, the surface to exchange heat is widened, and heat exchange is improved by promoting circulation by providing a hole on the heating metal plate 17. Namely, a glass vacuum double vessel 12 makes a gap between outer and inner bottles 13 and 14 into vacuum and prevents heat conduction caused by the circulation of air. An external case 15 prevents impulse from being loaded from side and upper faces to the glass vacuum double vessel 12. An elastic body 18 for heating water 16 by sinking the heating metal plate 17 onto the bottom of the heat insulating vessel is formed e.g. from silicone rubber, and sounds generated by vibrations at the time of boiling are prevented. A device 19 for generating a high-frequency magnetic field is composed of a heating coil 20 and a circuit 21 for letting a high-frequency current flow to the heating coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double glass vacuum container, ceramics, heat-resistant glass, and an electric water heater and pot using resin as a container.

[0002]

2. Description of the Related Art A conventional induction heating apparatus using a vacuum double container is disclosed as an electric jar pot in Japanese Patent Publication No. 22565/1992. The structure is as shown in FIG. 1 is a lid, 2 is an outer case, 3 is a vacuum double bottle provided in the outer case, 4 is water, 5 is a water detection element,
6 is a water temperature detecting element, 7 is a conductive metal, and 8 is a heating coil for inductively heating the conductive metal 7. 9 is a control circuit, 10
Is a heat insulating material, and 11 is a drainage port for discharging water by a pump action. Since the conductive metal 7 was fixed to the vacuum double bottle 3,
The water was in contact with only one side of the heated metal to exchange heat. Moreover, the conductive metal could not be removed and maintained.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to improve heat exchange between a heated metal and a liquid, and to improve the careability of the heated metal.

[0004]

In order to solve the above problems, the present invention provides a gap between a heating metal plate and a glass vacuum double container, and a hole or slit is provided in the heating metal plate. The heat exchange between the heating metal and the liquid is well configured.

As another means, the mouth of the glass vacuum double container is widened so that the heated metal can be taken out from the glass vacuum double container.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the invention described in claim 1, the heating metal is formed into a plate shape, and a gap of 0.5 mm or more is provided between the heating metal and the heat insulating container to bring the liquid into contact with the lower side of the heating metal plate. It is possible to increase the surface area for heat exchange and to provide convection by providing holes or slits in the heated metal plate to improve heat exchange.

According to the second aspect of the present invention, fins are provided on the surface of the heating metal to increase the surface area in contact with the liquid, and heat exchange can be improved.

According to the third aspect of the present invention, by making the heating metal into a linear shape, the contact area with the liquid can be widened with a simple structure, convection is good, and heat exchange can be improved.

According to the fourth aspect of the present invention, the mouth of the heat insulating container is widened so that the heat metal can be taken out of the heat insulating container.

According to the fifth aspect of the present invention, the glass melts when immersed in boiling water, and the resin melts when immersed in a cooking product containing oil. Therefore, the heating metal is used as a liquid container or a cooking container. , It has an effect of preventing dissolution by preventing direct contact of drinking water or cooked food with the heat insulating container.
Moreover, by making it possible to take it out from the heat insulation container,
It is easy to care for heated metal that is susceptible to water stains and other stains.

According to a sixth aspect of the present invention, an elastic body is attached to the heating metal, and when boiling, the heating metal and a heat insulating container made of a glass vacuum double container, ceramics, heat-resistant glass, etc. come into contact with each other and a rattling noise is produced. It can be prevented from occurring.

According to the seventh aspect of the present invention, the heating metal can be detachably fixed with a simple structure by pressing the heating metal with the elastic body sandwiched between the heating metal and the side surface of the heat insulating container.

According to an eighth aspect of the present invention, an elastic body having a hole is attached to the heating metal, a convex portion is provided on the heat insulating container, and the heating metal is attached to and detached from the elastic body with a simpler structure. Can be fixed as possible.

According to a ninth aspect of the present invention, the elastic body is attached to the heating metal, the heat insulating container is provided with a concave portion, and the heating metal is fixed by inserting the elastic body into the concave portion, whereby stress is applied to the heat insulating container. The heating metal can be detachably fixed without providing a convex portion that is easily engaged.

According to a tenth aspect of the present invention, an elastic body is attached to the heating metal, a heat insulating container is provided with a through hole, and the elastic body is inserted into the through hole, whereby a pipe for drawing out the liquid from the heat insulating container and heating are provided. Metal can be detachably fixed with the same elastic body.

According to the eleventh aspect of the present invention, the heat insulating container can be made strong by making it from ceramics, heat resistant glass and resin.

According to the twelfth aspect of the present invention, the heat retention performance can be improved by making the glass vacuum double container.

According to the thirteenth aspect of the present invention, the heating metal is a glass vacuum double container in which an inner bottle is provided with a metal having a thickness of 5 to 100 μm by plating, vapor deposition, coating or silver mirror reaction. There is no need to put it inside the double container, the heating metal and the elastic parts that fix it are reduced, and at the same time, there is no worry of the heating metal becoming dirty or rusting.

According to a fourteenth aspect of the present invention, at least a portion of the glass vacuum double container facing the heating coil of the outer bottle is not plated or vapor-deposited with metal, so that the outer bottle is heated by induction heating. There is no.

According to the fifteenth aspect of the present invention, the glass vacuum double container is protected from the heating coil by separating the glass vacuum double container together with the outer casing containing the glass vacuum double container. However, it is easier to carry and easier to use.

According to the sixteenth aspect of the invention, in the induction heating device, when the distance between the heating coil and the heating metal increases, the magnetic flux reaching the heating metal decreases and heating cannot be performed. By flattening, the distance between the heating coil and the heating metal can be reduced even in a commercially available IH cooker in which the heating coil is installed flat on the top surface.

According to a seventeenth aspect of the present invention, the bottom of the glass vacuum double container is made of a single glass, and a heat insulating material is installed below the bottom of the glass vacuum double container to provide a glass vacuum double container. The strength of the bottom can be increased.

According to the eighteenth aspect of the present invention, the bottom of the glass vacuum double container is spherical, and the heating coil has a shape along the bottom of the glass vacuum double container. And the distance between the heating coil and the heating metal can be reduced.

The invention according to claim 19 is that the outer case accommodating the glass vacuum double container is extended below the bottom of the glass vacuum double container, and the heating coil is provided from a surface contacting the outer case. By protruding and fitting into the inside of the exterior case, it is possible to reduce the possibility that the bottom of the glass vacuum double container accidentally collides with a tabletop or the like.

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 shows the configuration of a first embodiment of the present invention. Reference numeral 12 is a glass vacuum double container, and a vacuum is applied between the outer bottle 13 and the inner bottle 14 to prevent heat conduction due to convection of air. An outer case 15 prevents the glass vacuum double container from being impacted from the side surface and the upper surface. The water 16 is heated by sinking a heating metal plate 17 which is a heating metal on the bottom of the heat insulating container. The glass vacuum double container 12 has a wide mouth so that the heated metal plate can be taken out from the container in order to facilitate the maintenance of the heated metal that is easily stained with water stains and the like. 18 is an elastic body, such as silicone rubber,
The glass vacuum double container made of fluororubber or resin is not directly contacted with the heating metal plate to prevent the rattling noise caused by the vibration when boiling. Also, the heating metal plate can be detached with a simple structure by pressing the heating metal plate against the side surface of the glass vacuum double container with the elastic body 18 sandwiched between the glass vacuum double container and the glass vacuum double container. ing. Reference numeral 19 denotes a device for generating a high frequency magnetic field, which is composed of a heating coil 20 and a circuit 21 for supplying a high frequency current to the heating coil, and is used by placing a main body including a glass vacuum double container on a plate 22 on the top surface. Reference numeral 23 denotes a lid, which seals the glass vacuum double container, pressurizes the air therein by an air pump 24, and discharges water from a drain pipe 25.

FIG. 2 is a top view of the heated metal plate showing the shape of holes or slits. FIG. 3 is a side view of the heating metal plate 17. Not only heat is exchanged on the upper surface of the heating metal plate, but also heat is exchanged on the lower surface of the heating metal plate, and the liquid is heated to reduce its specific gravity or boil. The bubbles then convect upward through the holes or slits. The distance between the heating metal plate 17 and the inner bottle 14 is 0.5 mm in the case of a liquid with low viscosity such as water.
But enough convection.

FIG. 4 shows another embodiment of the heating metal, which is provided with fins 26 and has a large surface area for a liquid such as oil which has a high viscosity and is hard to exchange heat, thereby improving the heat exchange performance. FIG. 5 shows another embodiment of the heating metal, in which looped metal wires 27 are arranged in concentric circles at intervals, and elastic members 28 are fixed between them. The cross section of the metal wire is circular and the interval between the metal wires is wider than that of the metal plate, and thus the resistance to convection is small.

FIG. 6 is a view showing the heating metal 29 as a liquid container or a cooking container. The glass melts when immersed in hot water, and the resin melts when immersed in a cooking product containing oil. Dissolution is prevented by preventing contact with drinking water and food. Further, the elastic body 30 is sandwiched and fixed between the liquid container and the cooking container so that the elastic body 30 can be taken out from the heat insulating container, thereby facilitating the maintenance of the heated metal which is easily stained with water stains or other stains.

7 to 9 show another embodiment for fixing a heating metal. In FIG. 7, an elastic body 32 having a hole is attached to a heating metal plate 31, a convex portion 33 is provided on an inner bottle, and an elastic body is provided. The heating metal can be detachably fixed by being inserted into 32 holes. In FIG. 8, the elastic body 35 is attached to the heating metal 34,
The inner bottle is provided with the recessed portion 36 and the elastic body 35 is inserted into the recessed portion to fix the heating metal, and the heating metal can be detachably fixed without providing the container with a convex portion which is likely to be stressed. FIG. 9 shows a liquid outlet pipe 3 in which a through hole is formed in the bottom of a glass vacuum double container, an elastic tube 37 is inserted, and the tip is a water level display tube.
8 are connected. By attaching the heating metal 39 to the elastic tube 37, the liquid outlet tube and the heating metal can be fixed with the same elastic body. Although the heat insulating container has been described with reference to the double glass vacuum container, it may be made of ceramics or heat resistant glass. In this case, since it is thicker than the glass vacuum double container, it is strong and can be used without an outer case. When the heat insulating container is made of resin, the material itself is elastic, so that it can be used without an outer case.

FIG. 10 shows another structural example of the heating metal.
In an ordinary thermos, silver is plated to a thickness of about 1 μm on the entire vacuum side of a glass vacuum double container to reflect radiant heat. When this is induction-heated at about 20 kHz, it becomes about tens of watts. Since this amount is insufficient for boiling water and cooking, in the present invention, the inner bottle 40 has a vacuum side of 5 to 10 parts.
By providing silver 41 with a thickness of 0 μm by plating, vapor deposition, coating or silver mirror reaction and inductively heating it, it is not necessary to put the heating metal inside the glass vacuum double container, and the heating metal and it are fixed. At the same time as elastic body is unnecessary,
Since the heating metal is not submerged in liquid or food, there is no risk of the heating metal becoming dirty or rusting. For ease of processing, silver 42 may be provided inside the inner bottle as shown in FIG. On the other hand, even if the outer bottle of the glass vacuum double container is heated, the heat is hardly transferred to the contents of the inner bottle and energy is wasted. Therefore, at least the portion facing the heating coil of the outer bottle of the glass vacuum double container is made of metal. No plating or vapor deposition. Such a glass vacuum double container is manufactured by depositing silver on the inner bottle and then welding the inner bottle and the outer bottle.

In the embodiment of the present invention, as shown in FIG. 1, the glass vacuum double container 12 and the outer case 15 accommodating the glass vacuum double container are separated from the device 19 for generating a high frequency magnetic field. , While protecting the side and top of the glass vacuum double container, it is lightly portable. Here, in the induction heating device, when the distance between the heating coil and the heating metal is about 15 mm or more, the magnetic flux reaching the heating metal decreases and it becomes impossible to heat, but by flattening the bottom of the glass vacuum double container, Even in a commercially available IH cooker in which the heating coil is installed flat on the top surface, the distance between the heating coil and the heating metal can be reduced.

FIG. 12 shows another form of the glass vacuum double container, in which the bottom of the glass vacuum double container 42 is made of single glass.
Moreover, the heat insulating material 43 is installed under the bottom of the glass vacuum double container. When the heating coil and the heating metal inside the glass vacuum double container are brought close to each other while the glass is doubled, the glass bottle becomes thin and becomes weak against an impact from the bottom, but according to the present invention, the strength of the bottom is increased. be able to. FIG. 13 shows another form of the glass vacuum double container, which is a glass vacuum double container 4.
4 has a spherical bottom to increase the strength of the glass vacuum double container, and the heating coil 45 has a shape along the bottom of the glass vacuum double container so that the heating coil and the heating metal are close to each other.

(Embodiment 2) In FIG. 14, an outer case 47 accommodating a glass vacuum double container 46 is extended below the bottom of the glass vacuum double container, and a heating coil 48 contacts the outer case 47. The outer case 47 is configured so as to project from the surface 49 and fit inside the outer case 47.
The glass vacuum double container 46 when the table is placed on the dining table or the like (FIG. 14A) from the state in which it is separated from the dining table or the like (FIG. 14B).
Since the bottom of the glass vacuum floats above the table, the possibility of accidentally colliding the bottom of the glass vacuum double container 46 with a table or the like can be reduced.

[0034]

As described above, according to the present invention, the heat exchange between the heating metal and the liquid can be improved, and depending on the structure of the heat insulating container, the heating metal can be easily maintained and the strength of the bottom can be improved. be able to.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an induction heating device according to a first embodiment of the present invention.

FIG. 2 is a top view of a heating metal plate of the induction heating device.

FIG. 3 is a sectional view of a heating metal plate of the induction heating device.

FIG. 4 is a sectional view of another heating metal plate of the induction heating device.

FIG. 5 is a top view of another heating metal plate of the induction heating device.

FIG. 6 is a sectional view of the main part of the induction heating device.

[Fig. 7] Fig. 7 is a mounting structure diagram of a heating metal plate of the induction heating device

FIG. 8 is another mounting structure diagram of the heating metal plate of the induction heating device.

[Fig. 9] Fig. 9 is still another mounting structure diagram of the heating metal plate of the induction heating device.

FIG. 10 is another configuration diagram of the heating metal plate of the induction heating device.

FIG. 11 is a still another configuration diagram of the heating metal plate of the induction heating device.

FIG. 12 is a sectional view of the glass vacuum double container of the induction heating device.

FIG. 13 is a sectional view of another glass vacuum double container of the induction heating device.

FIG. 14 is a sectional view of an induction heating device according to a second embodiment of the present invention.

FIG. 15 is a sectional view of a conventional induction heating device.

[Explanation of symbols]

 12 glass vacuum double container 15 outer case 17 heating metal plate 18 elastic body 20 heating coil

Claims (19)

[Claims] 1. An insulating container, a heating metal placed inside the insulating container, and a heating coil installed outside the insulating container for heating the heating metal by a high frequency magnetic field,
The heating metal has a plate shape and is 0.5 m between the heating metal and the heat insulating container.
An induction heating device having a gap of m or more and a hole or a slit. 2. An insulating container, a heating metal placed inside the insulating container, and a heating coil installed outside the insulating container to heat the heating metal by a high frequency magnetic field,
The heating metal is an induction heating device having fins on its surface. 3. An insulating container, a heating metal placed inside the insulating container, and a heating coil installed outside the insulating container for heating the heating metal by a high frequency magnetic field,
The induction heating device, wherein the heating metal is in the form of a ring. 4. The induction heating device according to claim 1, wherein the heat insulating container has a size of a mouth through which heated metal can be taken out. 5. An insulating container, a heating metal placed inside the insulating container, and a heating coil installed outside the insulating container for heating the heating metal by a high frequency magnetic field,
The induction heating device, wherein the heating metal serves as a liquid container or a cooking container that can be taken out from the heat insulating container. 6. The induction heating device according to claim 1, wherein the heating metal has an elastic body attached thereto. 7. The induction heating device according to claim 1, wherein the heating metal is pressed and fixed by sandwiching an elastic body between the heating metal and a side surface of the heat insulating container. 8. The heating metal is attached with an elastic body having a hole, the heat insulating container is provided with a convex portion, and the hole of the elastic body is inserted into the convex portion of the heat insulating container to fix the heating metal. The induction heating device according to claim 1, wherein 9. The heating metal is attached to an elastic body, the heat insulating container is provided with a recess, and the heating metal is fixed by inserting the elastic body into the recess of the heat insulating container. The induction heating device according to any one of 1. 10. The heating metal is attached to the elastic body,
The heat insulating container is provided with a through hole, and the heating metal is fixed by inserting the elastic body into the through hole.
The induction heating device according to any one of 6 above. 11. The induction heating device according to claim 1, wherein the heat insulation container is made of ceramics, heat-resistant glass, or resin. 12. The induction heating device according to claim 1, wherein the heat insulating container is a glass vacuum double container. 13. A glass vacuum double container having a metal in an inner bottle, and a heating coil installed outside the glass vacuum double container for heating the metal by a high frequency magnetic field, wherein the metal is 5 to 100 μm. Induction heating device that is provided by plating, vapor deposition, coating or silver mirror reaction with the thickness of. 14. The induction heating device according to claim 12, wherein the glass vacuum double container has no metal at least in a portion facing the heating coil of the outer bottle. 15. The induction heating device according to any one of claims 12 to 14, wherein the glass vacuum double container is configured such that an outer case accommodating the glass vacuum double container can be separated from the heating coil. 16. The induction heating device according to claim 15, wherein the glass vacuum double container has a flat bottom. 17. The induction heating device according to claim 16, wherein the glass vacuum double container has a single bottom and a heat insulating material installed below the bottom. 18. The induction heating apparatus according to claim 15, wherein the glass vacuum double container has a spherical bottom surface, and the heating coil has a shape along the bottom of the glass vacuum double container. 19. An outer case containing a glass vacuum double container is extended below a bottom of the glass vacuum double container, and a heating coil projects from a surface abutting the outer case to the inside of the outer case. Claims 15 to 1 which are fitted
The induction heating device according to claim 8.