JPH0366308A - Fixing method for radiating plate in cover of rice cooker - Google Patents

Abstract

PURPOSE:To prevent vapor from intruding into the inside of a cover by screwing a set screw through a gasket of an elastic body at the time of fixing a radiating plate to a plastic molded part with the set screw. CONSTITUTION:A cover 1 of a rice cooker is constituted so that a cover heater is provided on the inside of the cover 1, and a radiating plate 3 for covering the lower face of the cover heater is fixed to a plastic formed part of the inside of the cover. At the time of fixing the radiating plate 3 to the plastic formed part 4, a set screw 5 is screwed through a gasket 6 made of silicone rubber. Therefore, even if a difference of thermal deformation is generated to some extent between the radiating plate 3 and the formed part 4, a gasket 6 fills up a shift between the radiating plate 3 and the formed part 4, and accordingly, it does not occur that vapor leaks from this junction part. In this regard, as for a material of the gasket, silicone rubber is selected, but it is not limited thereto, and if only it is an elastic body, other one is also available.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an improvement in a method for fixing a heat sink in a rice cooker lid.

[Prior Art] Rice cookers that heat and cook rice using electricity are now popular throughout the country and have become essential appliances in the kitchens of every household. Therefore, the enthusiasm of each manufacturer for developing this technology is amazing, and progress is literally being made every day.

The main aim of development is how to cook rice into delicious rice, and to this end, constant development efforts are being made in every detail. Especially recently, to improve the taste of rice,
An effective method is to heat the inner pot in which the rice is stored not only from the bottom but also from the sides and top. Therefore, a rice cooking method has been adopted in which the output of the lid heater, which was conventionally used mainly for keeping the rice warm, is increased and the lid heater is used from above to heat the rice when cooking or cooking rice unevenly. Watts has recently been strengthened to 60 to 80 Watts.

Figure 2 shows the lid of the rice cooker, (a) is a partial side view, (
b) is a plan view of the lid seen from the back, in which 1 is the lid, 2 is the lid heater, 3 is a heat sink, 4 is a plastic molded product, and 5 is a set screw.

As shown in the figure, the heat sink 3 covering the bottom surface of the lid heater 2 is
It is fixed to the plastic molded product 4 with a set screw 5.

[Problems to be Solved by the Invention] By the way, if the output of the lid heater is 10 watts, the temperature inside the lid is also about 120° C., which does not cause much problem. However, when the output of the lid heater is 60 to 80 watts, the temperature inside the lid reaches 250°C.
A misalignment occurs due to thermal deformation between the heat sink and the plastic molded product, and a gap is created at the joint between the heat sink 3 and the molded product 4. Steam inside the rice cooker leaks from this gap and enters the lid, causing damage inside the lid. Causes corrosion.

The present invention was made to solve this problem of rice cookers equipped with high-output lid heaters.The present invention was made to solve this problem with rice cookers equipped with high-output lid heaters. This is intended to provide a fixing method.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, when fixing the heat sink to the plastic molded product with set screws,
A set screw was screwed in through an elastic gasket.

[Function] As mentioned above, since the heat sink is fixed to the plastic molded product through the gasket, the temperature inside the lid will rise and due to the difference in thermal deformation between the heat sink and the molded product, a slight gap will be created between the two. Even if water vapor does occur, the gasket closes the gap, so water vapor will not leak from the joint and enter the interior of the lid.

[Embodiment of the Invention] FIG. 1 is a sectional view showing a method of fixing a heat sink to a plastic molded product according to an embodiment of the present invention, and 6 is a gasket made of silicone rubber.

As shown in the figure, in order to fix the heat dissipation plate 3 to the plastic molded product 4, a set screw 5 is screwed through a gasket 6 made of silicone rubber. Therefore, the heat sink 3
Even if a slight difference in thermal deformation occurs between the heat dissipation plate 3 and the molded product 4, the gasket 6 fills the gap between the heat sink 3 and the molded product 4, and therefore no water vapor leaks from this joint.

In this embodiment, silicone rubber is selected as the material for the gasket, but the material is not limited to this, and other elastic materials may be used.

[Effects of the Invention] In the lid of a rice cooker, the heat sink of the present invention is fixed to the plastic molded product by screwing with a set screw through a gasket. Even if the joint with the molded product is misaligned, the action of the gasket allows the joint to be brought into close contact and prevents water vapor from entering the interior of the lid from this part.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a main part of the lid showing a method of fixing a heat sink to a plastic molded product according to an embodiment of the present invention, and Fig. 2 shows a conventional fixing method as described above. (a) is a side cross-sectional view of the lid. Figure, (b
) is a plan view of the back of the lid. In the figure, 1 is a lid, 2 is a lid heater, 3 is a heat sink, 4 is a plastic molded product, 5 is a set screw, and 6 is a gasket. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A lid for a rice cooker that includes a lid heater inside the lid and a heat sink that covers the bottom surface of the lid heater and is fixed to a plastic molded product inside the lid, wherein the heat sink is a plastic molded product. A method for fixing a heat dissipation plate in a rice cooker lid, characterized in that when fixing with a set screw, the set screw is screwed through an elastic gasket.