JPH0445645Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heating plate for an electrically heated container such as an electric pot.

(Prior art) Conventionally, the heating plate of an electrically heated container is formed into a planar shape with as wide an area as possible in order to enhance the conduction effect, and is placed in close contact with the bottom surface of the container body so that the heat from the heater attached to the back surface is transferred. The contents of the container are heated by conduction.

Incidentally, in recent years, microcomputer control has progressed even in electrically heated containers, and various temperature detectors for detecting the temperature of the contents of the container have been installed. When this temperature sensor is attached to the heating plate,
Since the heating plate is hotter than the contents of the container, the temperature of the contents cannot be accurately detected. Therefore, it is necessary to attach it to the outer surface of the container near the heating plate, but it has become necessary to secure mounting space by cutting out the heating plate or providing a hole. For this reason, the heating plate has a hollow circular shape, a U-shape, or the like.

(Problem that the invention aims to solve) However, heating plates that have a hollow circular shape or a U-shape with a part cut out or a hole are undulated during heating and may not adhere tightly to the outer surface of the container. This caused problems such as the floating area generating abnormal heat, causing wires in the surrounding area to break, and temperature detectors located nearby to malfunction. Furthermore, when molding the heating plate, hot water flow is poor and defects such as cavities are likely to occur. Furthermore, a heating plate that is not connected at both ends, such as a U-shaped heating plate in particular, is easily deformed, making it difficult to mount the heater, and also causing problems such as an inability to maintain a flat surface on the contact surface.

The present invention was developed in view of these problems, and it has good moldability, is resistant to deformation, and
Another object of the present invention is to provide a heating plate for an electric heating container that allows easy attachment of a heater.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a heater that is installed on the outer surface of the container near a temperature detector that detects the temperature of the contents of the container, and directs the heat of the heater to the contents of the container. In the heating plate of the electric heating container for conducting conduction, the cross section into which the heater fits is approximately U-shaped, and the flat surface is formed into a substantially U-shaped groove, and the flat surface is formed approximately in the shape of the letter along the groove, and , the two ends are connected in a mold, the heater is fitted into the groove and caulked, the connecting part is cut out to form a flat oval shape, and a temperature sensor is installed in the hollow part forming the oval shape. It is attached closely to the outer surface of the container so that the

(Example) Next, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an electric pot equipped with a heating plate according to the present invention. The heating plate 1 is a heater removably installed at the bottom of an inner container 3, which is a vacuum double container housed in an outer shell 2. It is installed inside the case 4.

This heater case 4 is a circular case made by joining an upper case 5 and a lower case 6, and the upper case 5 has heater mounting bolts 7a, 7b, 7c, and 7d, and a pumping passage (not shown) for directing hot water in the inner container 3. The outflow pipe 8 of the upper case 5 is fitted into the lower case 6, and an outlet pipe 9 for leading out various wirings is provided. A male threaded portion 10 is formed in the portion.

And, this heater case 4 has its outlet pipe 9
Insert the packing 1 into the hole 3a provided at the bottom of the inner container 3.
1, and nut 1 from below the inner container 3.
2 is screwed onto the male threaded portion 10 of the outlet pipe 9 and fixed thereto. At this time, the heater case 4 forms part of the inner surface of the inner container 3.

Inside the heater case 4, there are a heating plate 1, a water heater 13, and temperature detectors 14a, 14b, 1.
4c and a heat-retaining heater 15 are incorporated.

The heating plate 1 is an aluminum cast product, and as shown in FIGS. 3 and 4, the heating plate 1 has a groove portion 16 on the bottom surface of which is approximately U-shaped in cross section and approximately U-shaped in plan view, into which the water heater 13 is fitted. It has a flat surface along the groove portion 16 in a substantially oval shape. As shown in FIG. 3, the heating plate 1 is formed by molding with both ends connected by a thin connecting part 17. Note that this connecting portion 17 is designed to be cut out after the water heater 13 is fitted into the groove portion 16 and caulked.

As shown in FIGS. 1 and 2, the heating plate 1 has a water boiler fixed to the groove 16 by water heater holding fittings 18a, 18b attached to heater mounting bolts 7a, 7b and 7c, 7d, respectively. Press the heater 13 from below to release the upper case 5.
The top surface is attached to the

The water heater 13 is a sheathed heater,
The heating plate 1 having the connecting portion 17 as described above
The heating plate 1 is fitted into the groove 16 and fixed to the heating plate 1 by caulking the edges of the groove 16.

The temperature detectors 14a, 14b, 14c are located in a hollow part A (see FIG. 3) that forms the approximate shape of the heating plate 1.
The upper case 5 is crimped to the upper case 5 by a temperature sensor holding fitting 19 disposed inside and attached to the heater mounting bolts 7a and 7c. The heat retention heater 15 is
As shown in FIG. 2, it is a semi-circular plate-shaped piece in which a core mica around which a heating wire is wound is held between two pieces of side mica. And this insulation heater 1
5 is a water boiler heater 13 that is attached to the heater mounting bolts 7c and 7d by a heat-retaining heater presser fitting 20.
It is attached by pressing one half of the

In addition, the water heater 13, the temperature detector 14a,
14b, 14c, and the lead wires of the heat-retaining heater 15, although not shown, are led out from between the outflow pipe 8 and the outlet pipe 9 below the inner container 3, and wired as appropriate.

In the heating plate 1 of the electric pot having the above configuration, the heating plate 1 before being assembled into the heater case 4
As shown in FIG. 3, since both ends of the approximate letter shape are connected by a connecting portion 17, the water circulation during mold molding is good and the moldability is good. In addition, when both ends are connected, the water heater 13 is connected to the groove 1.
6 and is crimped, it does not deform and the work is easy.

Then, the connecting portion 17 is removed and the heater case 4 is removed.
The heating plate 1 attached to the water heater 13
When heated by the upper case 5, it extends in its longitudinal direction due to thermal expansion, so it does not wave and the
That is, the adhesiveness with the outer surface of the container is maintained. Further, since the heating plate 1 has a substantially oval shape, the heating area can be larger than that of a hollow circular plate.

Furthermore, temperature detectors 14a, 14b, 14c
is placed in the hollow part A that forms the abbreviated shape of the heating plate 1 and is crimped to the upper case 5, so it does not come into direct contact with the heating plate 1 and is connected to the inner container through the upper case 5. It is possible to reliably detect the temperature of the hot water inside 3.

In the above embodiment, the heating plate 1 has a substantially oval shape, but it may have a reversed shape, a spiral shape, or the like.

(Effects of the invention) As is clear from the above explanation, according to the invention, the planar shape of the heating plate is formed in a substantially oval shape along the heater, so it does not wave during heating and does not overlap with the outer surface of the container. A state of close contact with the flat surface is maintained. In addition, since the heating plate before being attached to the outer surface of the container is connected at both ends of the square shape, moldability is good, there is little deformation, and the work of fitting and caulking the heater is easy. Furthermore, since the temperature sensor can be provided in the hollow part that forms the abbreviated shape of the heating plate, the temperature sensor does not come into contact with the heating plate.
This has the advantage of being able to accurately detect temperature.

[Brief explanation of the drawing]

Fig. 1 is an exploded sectional view of an electric pot equipped with a heating plate according to the present invention and its bottom, Fig. 2 is a bottom view of the heater case, Fig. 3 is a rear view of the heating plate before it is attached to the heater case, and Fig. 3 is a bottom view of the heater case. FIG. 4 is a sectional view taken along the - line in FIG. 3. 1... Heating plate, 3... Inner container, 5... Upper case (outer surface of container), 13... Water heater, 14a, 1
4b, 14c...Temperature detector, 16...Groove, 1
7...Connection part, A...Hollow part.

Claims (1)

[Scope of Claim for Utility Model Registration] A heater fits in a heating plate of an electrically heated container that is installed on the outer surface of the container near a temperature sensor that detects the temperature of the container contents and conducts heat from the heater to the container contents. It has a groove with a substantially U-shaped cross section and a substantially U-shaped plane, and the plane is formed in a substantially U-shaped shape along the groove, and the both ends are connected by mold molding, and the heater is placed in the groove. After fitting and caulking, the connecting part is cut out to form a flat oval shape, and the temperature sensor is attached tightly to the outer surface of the container so that the temperature sensor is located in the hollow part forming the oval shape. A heating plate for an electric heating container characterized by: