JPH049949Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an electric pot, and particularly to the shape of its submersible heater.

[Conventional technology]

The submersible heater of the electric pot is inserted into the container through the mouth and fixed to the communication pipe at the bottom of the container. Conventionally, the underwater heater described above has generally been formed to have a circular planar shape.

[Problem that the invention attempts to solve]

Heating element used in underwater heaters (sheathed heaters, etc.)
Since there is an upper limit to the watt density, when creating an underwater heater with a certain output, the design must be such that the watt density does not exceed the upper limit. Therefore, the diameter of the underwater heater cannot be reduced below a certain value.

On the other hand, it is desirable that the diameter of the container be made as small as possible in order to improve heat retention performance. However, as mentioned above, the diameter of conventional submersible heaters cannot be made below a certain level, and since such submersible heaters must be inserted through the mouth of the container, the diameter must be larger than a certain level. . Therefore,
It was not possible to avoid a decrease in the heat retention performance of the pot.

Therefore, the purpose of this invention is to improve the shape of the submersible heater to provide an electric pot equipped with a submersible heater that can be inserted into containers with a smaller diameter than conventional ones without reducing the heating capacity. shall be.

[Means for solving problems]

In order to solve the above problems, this invention has an oval planar shape for the underwater heater, and the short axis of the oval is smaller than the inner diameter of the container mouth, and the longer axis is larger than the inner diameter of the container mouth. The overall shape of the submersible heater when viewed from the major axis direction is formed into a shape included within the inner circumferential circle of the container mouth.

〔Example〕

The attached drawing shows an example of an electric air pot using a vacuum double container 1 made of stainless steel, and a submersible heater 3 is attached to a screw hole 2 formed in the bottom of the container 1.

The underwater heater 3 is connected to a hot plate 6 by a presser fitting 5 provided on the inner surface of a stainless steel case 4.
A sheathed heater 7 inserted into the groove is attached.

Further, a thermostat 8 is fixed to the inner surface of the case 4, and an upper end of a communication pipe 9 is fixed to a hole in the center of the case 4.

Further, a threaded cylinder 11 is attached to a hole in the center of the bottom cover 10 of the case 4, and the communication pipe 9 and the electric cord 12 are inserted into the threaded cylinder 11. Also,
A heat-retaining heater 13 is attached to the inner surface of the bottom lid 10. The above-described threaded cylinder 11 is fixed to a threaded hole 2 formed in the bottom surface of the container 1 in a watertight manner.

As shown in FIG.
It is connected to 7.

Incidentally, the case 4 of the underwater heater 3 is formed into an elliptical shape as shown in FIG. It is formed so that it is smaller than the diameter, and its major axis is larger than the diameter of the inner circumferential circle a.

Further, the overall shape of the underwater heater 3 viewed from the direction of the major axis is formed within the inner circumferential circle a, as shown in FIG. That is, when inserting the submersible heater 3 from the mouth of the container 1 into the circular part, if the long diameter of the case 4 is aligned with the central axis of the container, a part of the submersible heater 3 will be inserted into the inner circumferential circle of the mouth 18. The thickness of the case 4, the length of the communication pipe 9, etc. are selected so as not to interfere with the case 4.

Furthermore, in order to maintain the amount of heat generated at the same level as in the conventional case, the ellipticity of the surface area of the case 4 is appropriately selected so as to be at the same level as that of a circular case.

Note that the ellipse referred to in this invention is a concept that includes not only a geometrically defined ellipse but also a so-called ellipse in which two sides along the major axis are parallel.

In the above embodiment, to give a specific example, the major axis of the case 4 of the submersible heater 3 is 110 mm, and the minor axis is 83 mm.
mm, and the diameter of the inner circumferential circle a of the mouth portion 18 of the container 1 is 90 mm. Further, the upper surface area of case 4 is 71.7 cm ² .

If a circular underwater heater with the same surface area as above is manufactured, its diameter will be 95.6 mm, so the diameter of the inner circumference a of the container must be selected to be approximately 100 mm.

Therefore, in the case of the embodiment, the inner circumferential circle a can be selected to be 10% smaller in diameter and about 20% smaller in area.

[Effect of idea]

As described above, in this invention, the planar shape of the submersible heater is an ellipse, its short axis is smaller than the inner diameter of the container mouth, and its longer axis is larger than the inner diameter of the container mouth, and the direction of the long axis is By forming the overall shape of the submersible heater in a shape that is included in the inner diameter of the container mouth, the inner diameter of the container mouth can be selected in accordance with the short diameter of the submersible heater. Therefore, if the surface area is the same as that of a conventional circular submersible heater, the short axis of the submersible heater of this invention will always be smaller than the diameter of a circular submersible heater, so the inner diameter of the container mouth should be selected to be smaller accordingly. This has the effect of improving heat retention performance without impairing heating performance.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the embodiment, Fig. 2 is a bottom view of the submersible heater with the bottom cover removed, Fig. 3 is a sectional view of the submersible heater, and Fig. 4 is a diagram showing the relationship between the submersible heater and the inner circumference of the mouth. FIG. 3 is a plan view showing the relationship. 1... Container, 2... Screw hole, 3... Submersible heater, 4... Case, 7... Sheathed heater, 9...
Communication pipe, 10... bottom cover.

Claims (1)

[Scope of utility model registration request] In an electric pot with a submersible heater installed inside the container, the planar shape of the submersible heater is oval, and the short axis of the oval is smaller than the inner diameter of the container mouth, and the longer axis is larger than the inner diameter of the container mouth. An electric pot characterized in that the entire shape of the submersible heater when viewed from the direction of the major axis is formed to be included in the inner circumferential circle of the mouth of the container.