JPH0315921Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a chain structure for a microwave oven.

<Prior Art> The general structure of a conventional microwave oven will be explained. Fourth
As shown in FIGS. 7 to 7, in a microwave oven equipped with a heater, which has a heater D in the oven chamber A and which rotates so as to be able to move up and down depending on the heating mode of the heated object, the heater D is powered. In order to supply the heat, the heater D penetrates the side wall of the oven chamber A and is led out to the outside. Since the heater D rotates, it has a structure as shown in FIG. As shown in Fig. 4, the heating wire H of the heater D is fitted on the outside with a metal sheathed tube M through an insulating powder N, and the terminal Ha of the heating wire H is connected to the sheathed tube M with an insulating steatite Z.
is fixed. In the part where the end 4a of the heater D is penetrated and pulled out of the oven chamber A,
A chiyoke structure is provided to prevent radio waves from the oven chamber A from leaking outside the oven chamber A during microwave heating by the magnetron B shown in FIGS. That is, the heater D is held by an insulating cylinder 6 as shown in FIG. 5, and the chiyoke structure is constituted by a metal sleeve tube 9 and a chiyoke box 1E.

With the above structure, microwave leakage is reduced even during microwave heating, and the vertical position of the heater D can be switched smoothly. However, the radio wave leakage in this structure is about 3 to 5 mW/ ^cm3 ,
Indicates that the chiyoke structure is not completely formed,
Prevention of radio wave leakage is far from satisfactory.

<Purpose> Therefore, the present invention aims to provide a microwave oven that can drastically reduce leakage of radio waves.

<Embodiment> Hereinafter, an embodiment of the present invention will be explained using the microwave oven shown in FIGS. A heater D as an internal operating body is led out from the inside of the oven to the outside of the oven through the first hole 3, and the side wall Ea on the oven side is connected to the outside of the first hole 3 of the side wall 2 of the oven A. A closed box-shaped microwave box E is tightly fixed, a second hole 4 for preventing microwave leakage is formed in the side wall Ea of the microwave box E on the side of the oven compartment A, and a second hole 4 for preventing microwave leakage is formed on the side wall Ea of the microwave box E on the side of the microwave oven body 1. A third hole 5 is formed in the side wall Eb, a chiyoke insulating cylinder 6 is fitted into the third hole 5, and the heater is inserted into the chiyoke insulating cylinder 6 of the first hole 3, second hole 4 and third hole 5. D is derived through,
The second hole 4 is formed to have a smaller diameter than the first hole 3, and its hole edge 4b is placed close to the heater D.

A magnetron B is fixedly installed on the upper surface of the oven chamber A. The heater D is led out from inside the oven A through the insulating tubes 6 of the first hole 3, second hole 4, and third hole 5, which are circular and have the same shape as the heater D. The heater D is rotatably supported at the rear of the side wall 2 of the oven chamber A. When the heated object is browned in grill cooking or the like, the heater D is lowered as shown by the imaginary line in FIG. 7 to bring it closer to the heated object, and when not in use, it is raised as shown by the solid line. Moreover, the second hole 4 is formed as small as possible compared to the third hole 5.

Figure 3 shows radio wave leakage data obtained by varying the inner diameter of the second hole 4. From this experimental data, the smaller the inner diameter of the second hole 4 of the Cheyoke box E, the more radio wave leakage. It can be seen that the amount decreases rapidly. Therefore, even without the sleeve tube 9 shown in the prior art, the performance remains the same, so there is no need to provide a sleeve tube in this embodiment.

In this embodiment, the internal operating body is the heater D, but the present invention is not limited to this, and may be other components such as a temperature detection probe.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects> As is clear from the above description, the present invention has an oven chamber built into the microwave oven body, and a first hole formed in the side wall of the oven chamber to allow air flow from inside the oven chamber to outside the oven chamber. The actuating body is led out, and a box-shaped check box is tightly fixed to the side wall of the oven chamber with the side wall on the oven chamber side closed off outside the first hole, and microwave leakage is prevented from occurring on the side wall of the oven chamber side of the check box. A second hole for prevention is formed, a third hole is formed in the side wall of the microwave box on the side of the microwave oven body, an insulating tube is fitted into the third hole, and the first hole, the second hole and the third hole are fitted. The internal operating body is led out through a three-hole chiyoke insulating cylinder, and the second hole is
It is formed to have a smaller diameter than the first hole, and the edge of the hole is brought closer to the internal operating body.

Therefore, even if the internal operating body (heater in this example) is drawn out to the external terminal by penetrating the side wall of the oven, the second hole of the York box has a small diameter, and the hole edge of the second hole and the inside of the oven Since the distance between the actuator and the operating body is small, leakage of microwaves from the second hole into the York box is extremely reduced.

In other words, the side wall of the oven box is used to close the first hole, which normally requires a diameter larger than the diameter of the heater when inserting the heater. Since the second hole prevents radio wave leakage, there is no need to insert a tube or other members for preventing radio wave leakage inside the box, which reduces the number of parts and costs.

In addition, compared to the conventional structure in which the thinner the yoke structure is, the more radio waves leak, even with a thinner yoke structure, by reducing the diameter of the second hole on the oven side, it is possible to reduce radio wave leakage and improve performance. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the Cheyoke box, Fig. 2 is a cross-sectional view of the heater's passage through the oven compartment, Fig. 3 is a graph showing the relationship between the inner diameter of the second hole and radio wave leakage, and Fig. 4 is a cross-sectional view of the heater end. 5 is a sectional view of a conventional chiyoke part, FIG. 6 is a schematic longitudinal sectional front view of a microwave oven,
FIG. 7 is also a schematic longitudinal sectional side view. A: Oven compartment, B: Magnetron, D: Heater, E: York box, Ea: Oven compartment side wall,
Eb: Microwave oven main body side wall, 1: Microwave oven main body, 2: Side wall, 3: First hole, 4: Second hole, 4b:
Hole edge, 5: Third hole, 6: Chiyoke insulating tube.

Claims (1)

[Scope of utility model registration request] An oven chamber is installed in the microwave oven body, an internal operating body is led out from the inside of the oven chamber to the outside of the oven chamber through a first hole formed in a side wall of the oven chamber, and a first hole is formed in the side wall of the oven chamber. A box-shaped cheese box is tightly fixed on the outside of the box with the side wall on the oven side closed, and a second hole for preventing microwave leakage is formed in the side wall of the oven box on the oven side. A third hole is formed in the side wall on the main body side, and a chiyoke insulating cylinder is fitted into the third hole,
The internal operating body is guided through the insulation tubes of the first, second, and third holes, and the second hole is formed to have a smaller diameter than the first hole, and the edge of the hole is connected to the inside of the refrigerator. A microwave oven characterized by being located close to an operating body.