JPS5855596Y2 - High frequency heating device - Google Patents

Description

[Detailed description of the invention] This invention relates to an electric seal for a high-frequency heating device.
The purpose is to improve the sealing effect with a simple configuration, reduce costs, and improve workability.

Conventional radio wave seals for high-frequency heating devices include (a) a combination of a choke seal and conductive rubber or ferrite, (b) a combination of a seal spring and conductive rubber or ferrite rubber, and (C) a plate spring method. Many methods have been adopted, including a combination of conductive rubber or ferrite rubber, and (d) a chalk wall with comb-shaped slits.

The present invention relates to a radio wave seal in which comb-shaped slits are formed in the choke wall of the method (d) described above, and one embodiment of the present invention will be described below.

Reference numeral 1 denotes a main body of a high-frequency heating device, which has a heating chamber 2 formed therein, and a door 3 is provided at the front opening of the heating chamber 2 so as to be openable and closable.

The door 3 is composed of a main body having a peephole 4 in the center, a groove 6 formed on the peripheral edge opposite to the front opening periphery 5 of the heating chamber 2, and a punching plate 7 for sealing the peephole 4. A comb-shaped slit 8 is formed at the periphery of the punching plate 7, and the slit 8 is covered with a low dielectric material 9 such as resin.

That is, as shown in FIG. 1, the door 3 is constructed by attaching a punching plate 7 to a boss portion 11 provided on the door body with screws 10.
The slit 8 is located at the opening of the groove 6 of the door body, and a part of the low dielectric material 9 covering the slit 8 is inserted into the groove 6.

That is, the low dielectric material 9 seals the groove 6 to prevent dirt or dust from entering the groove 6 during cooking, and the slit is integrally molded with resin or covered with a resin cover.

In the present invention, instead of integrally molding the resin part of the slit part or covering it with a cover, as shown in the cross-sectional view of FIG.
A low dielectric material 10 such as synthetic resin paint or enamel is applied to the slit 8, and the slit 8 is bridged by the surface tension of the material, and then baked and solidified.

The above configuration has the following effects.

(1) In the case of conventional resin integral molding or covers, there is a manufacturing limit to the resin thickness t.

In other words, in the case of integral molding, a thickness of at least 2 mm is required for the resin material to flow during molding, but the present invention can be made extremely thin by applying a low dielectric material and post-baking.

That is, in the case of resin coating, it is about 0.1 to Q, 2 mm, and in the case of hoop coating, it is about 0.2 to Q, 5 mm.

Therefore, the absolute amount of radio waves leaking from the heating chamber side becomes extremely small, and the amount of leaked radio waves becomes extremely small.

(2) In the conventional case, only resin materials could be used, but in the present invention, even enamel materials can be used, and the heat resistance is greatly improved.

Recently, a so-called microwave oven that has a heater built into a high-frequency heating device has been commercialized, but in this case, resin could not be used because of insufficient heat resistance.

However, with the present invention, it became possible to withstand the problem sufficiently.

(3) In conventional products, the metal plate (punched plate) and the resin are simply brought into close contact with each other, so there is inevitably a gap, which can cause food particles to enter between the gaps, resulting in uncleanliness and odor. However, in the present invention, the metal and dielectric material are bonded without any gaps, so food particles and the like do not get in, making it clean and easy to clean.

(4) The punching part is generally painted black or coated with a hollow to make it easier to see the heating chamber, but in the present invention, the slit part can be bridged at the same time as this painting or hollowing, which greatly improves workability.

(In the conventional model, this was done in a separate process.) Next, the end of the slit 8 in Figure 5 is rounded by rounding it, but this rounding increases the thickness of the dielectric material at the slit. The strength of the slit portion is greatly improved, and the cut surfaces of the slit do not face each other, and there is no fear that radio waves will enter the choke portion where the radio waves are weak and cause high-frequency discharge.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of a high-frequency heating device showing an embodiment of the present invention, Fig. 2 is a perspective view of the main part of the door body, Fig. 3 is a plan view of the punching plate, and Fig. 4 is FIG. 5 is a plan view of the punching plate with a cover placed on it, and a cross-sectional view of the essential parts thereof. 7...Punched plate, 8...Slit, 10...Low dielectric material.

Claims (2)

[Scope of utility model registration request] (1) A door is provided at the front opening of the heating chamber so that it can be opened and closed, a groove is formed in the door at a position opposite to the periphery of the front opening of the heating chamber, and a comb-shaped slit is formed in the opening of this groove. A high-frequency heating device characterized in that a metal plate is positioned, a dielectric material of a hollow solution or a paint part is applied to the metal plate, and the slit part is cross-linked by surface tension and then baked and covered. (2) The high-frequency heating device according to claim 1, which is a registered utility model, characterized in that the slit ends are rounded and bent.