JPH0240904Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a heat retention device for electric cookers used in general households.

BACKGROUND ART A conventional heat retaining device for an electric cooker of this type has a structure as shown in FIGS. 4 and 5, as shown in, for example, Japanese Utility Model Application Publication No. 57-51408. In the figure, 1 is the main body of the cooking device, 2 is a bottomed cylindrical protective frame fixed to the upper part of the main body 1, and at the bottom of this protective frame 2 is a bottomed cylindrical pot 3 in which the food to be heated is placed.
A heating element 4 is provided on which the heating element is placed. Reference numeral 5 denotes a lid body that covers the upper opening of the main body 1. This lid body 5 is pivoted on one side and can be opened and closed freely by being freely engaged and detached on the other side. 6 is an inner lid that covers the upper opening of the pot 3. Reference numeral 7 denotes a heat dissipation plate disposed above the inner lid 6. Above the heat dissipation plate 7, a lid heater 8 is provided to prevent dew condensation on the inner lid 6, etc., and this lid heater 8 is made of aluminum foil. 9 and a heat sink 7. FIG. 5 shows this clamping state in more detail. That is, the aforementioned lid heater 8 is a silicon-coated heat source, and the amount of heat generated per unit surface area is limited. For this reason, conventionally, in order to attach a long heating wire to the heat dissipation plate 7, the lid heater 8 is first clamped between aluminum foil and the pressure-sensitive adhesive 10, and then the pressure-sensitive adhesive 10 is attached to the lid heater 8. It was fixed in pressure contact with the heat sink plate 8.

Problems to be Solved by the Invention However, with this type of structure, there were the following four problems.

(1) As mentioned above, it is necessary to fix the lid heater 8 to the aluminum foil side first, and since the heating wire of the lid heater 8 is long, it is necessary to make it wavy as shown in Fig. 5. In that case, it was necessary to use jigs and tools to perform the work, resulting in poor assembly efficiency.

(2) When fixing the lid heater 8 to the heat dissipation plate 7, if the position is shifted too much, sufficient performance cannot be ensured, so it is necessary to control the location where it is attached, and the assembly is not easy.

(3) Since the lid heater 8 and the aluminum foil 9 are brought into pressure contact by first drawing into a predetermined shape,
The contact area is large, but on the other hand, since the lid heater 8 and the heat sink 7 are in line contact, the contact area is small, so heat is transferred to the heat sink 7,
Thereafter, heat was transferred to the inner lid 6, and the thermal efficiency for preventing dew condensation on the inner lid 6 was poor due to the small contact area.

(4) Since the sheet of pressure-sensitive adhesive 10 is interposed between the lid heater 8 and the heat sink 7 as described above,
Its thermal efficiency was even worse.

This invention solves the above conventional problems,
It is an object of the present invention to provide a heat retaining device for an electric cooker that has good thermal efficiency and is easy to assemble.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes a lid body that is pivotally supported on one side of the upper part of the cooker body and can be opened and closed at the other side of the upper part of the cooker body. a bottomed cylindrical pot that can be freely inserted into and removed from the inside of the cooking device body and has an opening in the upper part for storing a food to be heated; and an inner lid that covers the opening of the pot;
A heat radiating plate disposed inside the lid body and located above the inner lid, and an annular lid heating element made of a glass-coated silicon tube that is clamped by metal foil above the heat radiating plate. The heat dissipation plate has an annular recess for mounting the lid heating element, and the lid heating element is fixed to the heat radiation plate side surface of the metal foil with an adhesive.

According to the above structure, the annular lid heating element made of a glass-coated silicon tube is attached to the annular recess of the heat sink, and then the lid heating element is fixed to the heat sink side surface of the metal foil with adhesive. As a result, it has the following effects.

(1) Glass-coated silicon tubes have a heat resistance of around 300 degrees Celsius, whereas the heat resistance of simple silicon tubes is around 180 degrees Celsius, so it is possible to increase the amount of heat generated per unit area. You can shorten the length of the line.

(2) Since there is an annular recess for positioning when fixing the lid heating element, there is no need to provide any special positioning.

(3) The lid heating element is annular, and the heat sink also forms an annular recess into which the annular lid heating element is attached, so each contact is a surface contact, and as a result, the area for heat transfer increases. do.

(4) Since there is a lid heating element between the metal foil and the heat sink, and the adhesive is placed on the metal foil surface,
No adhesive is present between the heat radiating plate and the lid heating element, and as a result, a heat retaining device with good delivery efficiency and ease of assembly can be provided.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIG. 2, reference numeral 11 denotes a main body of the electric cooking device, and 12 a bottomed cylindrical protective frame arranged inside the main body 11 of the electric cooking device, and a heating element 13 is arranged at the bottom. Reference numeral 14 denotes a bottomed cylindrical pot having an opening at the top for storing the food to be heated. 15 is a lid body that covers the upper opening of the cooking device main body 11, and this lid body 1
5 is pivotally supported on one side, and is engaged and disengaged on the other side so that it can be opened and closed. 16 is an inner lid that covers the upper opening of the pot 14.

In FIG. 1, 17 is a lid heating element for preventing dew condensation on the inner lid 16, and has an annular configuration. Reference numeral 18 denotes a heat dissipation plate having an annular recess 18a into which the annular lid heating element 17 is mounted, and this heat dissipation plate 18 is usually made of aluminum. The annular lid heating element 17 is a silicon tube heater whose surface is coated with glass. 19 is a metal foil made of aluminum foil or the like. Reference numeral 20 denotes an adhesive disposed on the surface of the metal foil 19, and this adhesive 20 may be a sheet-like pressure-sensitive adhesive or a coated adhesive.

In FIG. 3, 21 fixes the heat sink 18,
And the lead wires 17a, 17 of the annular lid heating element 17
This outer cover 21 is an outer cover that fixes a.
As an example, the annular lid heating element 17 is supported inside the lid body 15 by interposing.

In the above configuration, the operation will be explained next. 1st
In the figure, if the annular lid heating element 17 is attached to the annular recess 18a of the heat sink 18 and the metal foil 19 with adhesive 20 is pressed against the heat sink 18, the metal foil 19 and the heat sink 18 will be separated by the adhesive 20. As a result, the annular lid heating element 17 is in close contact with the heat sink plate 18.

That is, by simply mounting and fixing the annular lid heating element 17 in the annular recess 18a of the heat sink 18, the annular lid heating element 17 can be brought into close contact with the heat sink 18 without the need for particular positioning and assembly. , and the adhesive 20 is attached to the annular lid heating element 17 and the heat sink 18.
Since it is a glass-coated silicon tube wire, not only can heat be transferred to the heat sink 18 at high temperatures, but also the heat can be conducted from the entire surface of the annular recess 18a to the inner cover 16, so the conductive area is small. increases, and the heat exchange coefficient becomes extremely good. As a result, the temperature of the inner lid 16 can be easily maintained at 100° C. or higher, so that dew condensation can be efficiently blown away.

Effects of the invention As described above, according to the invention, the annular lid heating element made of a glass-coated silicone tube can be closely attached to the annular recess of the heat sink without intervening adhesive, which improves ease of assembly. This can improve the efficiency of heat transfer to the inner lid, and can also contribute to resource and energy savings by shortening the heating wire.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a main part of a heat retention device for an electric cooker showing an embodiment of the present invention, FIG.
The figure is an exploded perspective view of the main parts, FIG. 4 is a front view showing a cross section of the main parts of the heat retention device of a conventional electric cooker, and FIG. 5 is an exploded perspective view of the main parts. DESCRIPTION OF SYMBOLS 11...Cooker main body, 14...Pot, 15...Lid body, 16...Inner lid, 17...Annular lid heating element, 1
8... Heat sink, 18a... Annular recess, 19... Metal foil, 20... Adhesive.

Claims (1)

[Scope of utility model registration request] a lid body which is pivotably supported on one side of the upper part of the cooking appliance body and can be freely opened and closed, and which is detachable from the other side of the upper part of the cooking appliance body; A cylindrical pot with a bottom having an opening for storing heated food, an inner lid that covers the opening of the pot, and a heat sink disposed inside the lid and located above the inner lid. and an annular lid heating element made of a glass-coated silicone tube which is clamped by metal foil above the heat sink, and an annular recess in which the lid heating element is mounted is formed in the heat sink; and a heat retaining device for an electric cooker, wherein the lid heating element is fixed to the heat sink side surface of the metal foil with an adhesive.