JPS6133447Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to prevention of overheating and improvement of insulation at the end of a heater in a device such as a microwave oven equipped with a heater, which uses an electric heater to heat a heating chamber to a high temperature.

BACKGROUND ART Conventionally, an electric heater of a microwave oven with a heater is installed so as to penetrate a cabinet 5 from inside a heating chamber 1, as shown in FIG. A heater terminal cover 4 is provided on the side of the cabinet 5, and a heater terminal 7 is disposed within the heater terminal cover 4.

In these conventional examples, since the terminal 7 of the heater 2 is placed inside the sealed heater terminal cover 4,
The temperature in the vicinity of the heater terminal 7 rose, and the insulation of the support member of the heater 2 was likely to deteriorate, and there was a fear that an electric leakage accident would occur. For this reason, attempts have been made to lengthen the non-red-hot portion of the heater 2 to suppress the temperature rise at the heater terminal 7. However, in these conventional examples, since the red-hot part of the heater 2 is arranged at a position away from the wall of the heating chamber 1, uneven heating occurs. Furthermore, since the non-red-hot portion including the heater terminal 7 is made longer and the temperature rise of the heater terminal 7 is suppressed, there is a drawback that the depth dimension of the heater terminal cover 4 becomes large.

The present invention is intended to eliminate these drawbacks of the conventional technology.The purpose of the present invention is to prevent insulation deterioration of the heater by cooling the terminal part of the heater while allowing air to pass through the terminal part of the heater, and to prevent the heater from emitting red heat. An object of the present invention is to provide a heater terminal cooling structure for a microwave oven, which is capable of reducing the length of the heater terminal cover and the depth of the heater terminal cover.

Hereinafter, the present invention will be explained in detail with reference to the drawings of a preferred embodiment.

FIG. 2 shows a heater terminal cooling structure according to the present invention, in which a heater 2 penetrating a heating chamber wall 3 is disposed within a heating chamber 1 and a heater terminal cover 4. Further, a heat insulating material 6 is filled between the heating chamber wall 3 and the cabinet 5. A louver 9 is attached to the heater terminal cover 4.
is attached, and the inside and outside of the heater terminal cover 4 are ventilated. Therefore, in the heater terminal cover 4,
Heater terminal 7 and heater charging terminal 8 are cooled by air from outside.

FIG. 3 is an enlarged view of the heater terminal portion and heater terminal cover portion shown in FIG. 2. The operation of the present invention will be explained below with reference to FIG. The heater terminal 7 and heater charging terminal 8 of the heater 2 are both upper and lower surrounded by a heater terminal cover 4 having double louvers 9. The double louvers 9 are formed in different directions, so that even if a wire or the like is inserted from the outside, it will not come into contact with the charged portion of the heater. The heat insulating material 6 blocks radiant heat from the heating chamber 1 and prevents the temperature of the heater terminal 7 from rising. Therefore, the temperature rise of the heater terminal 7 and the heater charging terminal 8 is suppressed by the ventilation effect by the louver 9 and the blocking of radiant heat by the heat insulating material 6. In addition, in measurements made using the embodiment of the present invention, the temperature at the end of the heater could be lowered by about 30°C compared to the conventional example.

As described above, the present invention provides the heater terminal cover 4 with double-layered louvers 9 having different directions, so that the following effects are achieved.

1. Since the temperature at the terminal of the heater decreases, insulation performance improves, eliminating the risk of electrical leakage.

2. Since the opening directions of the double louvers are configured to be opposite to each other, electric shock accidents caused by insertion of wires, etc., are prevented.

3. Since the non-red-hot part of the heater can be shortened, the depth of the heater terminal cover can be reduced.

4. The red-hot part can be placed close to the oven wall, which provides excellent effects such as preventing uneven heating.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram for explaining the structure of a conventional microwave oven, FIG. 2 is a sectional view of the microwave oven according to the present invention, and FIG. 3 is a partially enlarged view of the microwave oven shown in FIG. 2. In the figure, 1 is a heating chamber, 2 is a heater, 4 is a heater terminal cover, 6 is a heat insulating material, and 9 is a louver.

Claims (1)

[Scope of utility model registration request] In the electric heater terminal structure of an oven range, in which an electric heater protruding outward from the cabinet of the oven range is covered with a heater terminal cover, the heater terminal cover is provided with ventilation openings consisting of double louvers spaced apart from each other and inclined in opposite directions.