JPH0347279Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a microwave oven door structure having a function of preventing leakage of high frequency waves to the outside of the oven.

[Prior art]

In the conventional microwave oven door structure, as shown in FIG. 4, a door 15 is attached to the front surface of a microwave oven body 14, and the outer periphery of the door 15 is covered with a door screen 16. Inside the door screen 16 is a door panel 1 that is partially U-shaped in cross section.
7 is formed along the inner peripheral edge of the door screen 16. The door panel 17 is fixed to a sealer plate 18 provided on the inside thereof by screws or welding, and is fixed in a structure that closes the lower half of the opening of the door panel 17, which is partially U-shaped in cross section. The upper half of the opening is the sealer plate 18
It is closed by a teak cover 19 provided at the upper end. Cooking chamber 2 of the sealer plate 18
A sealer film 21 is placed on the 0 side, and a sealer plate 1 is placed on the 0 side.
8 and the door panel 17 contact each other. The space formed by the door panel 17, the sealer plate 18, and the yoke cover 19 functions as a yoke 22. That is,
an outer frame 23 forming the top wall of the microwave oven main body 14;
Among the front plate 24 and the top plate 25, leakage of high frequency waves from the cooking chamber 20 is suppressed by the action of a capacitive seal formed by the front plate 24 and the sealer plate 18. The leaked high frequency waves that have passed through the capacitive seal are guided into the yoke 22 from the contact portion between the lower end of the yoke cover 19 and the upper end of the sealer panel 18, and they interfere with each other and cancel each other out within the yoke 22. This prevents high-frequency waves from leaking outside the device.

However, in the conventional example, the number of parts and the number of assembly steps are increased, which increases manufacturing costs, and the back surface of the door 15 is not easy to clean, and the aesthetic appearance is also impaired.

Therefore, in recent years, a microwave oven door structure as shown in FIG. 5, which is an improved version of the above structure, has been proposed. The door structure of this microwave oven eliminates the teak cover 19 in the conventional example shown in FIG. That is, while the sealer plate 18 is slightly enlarged vertically and laterally, a gap 26 is formed between the upper edge of the inner opening of the door panel 17 attached to the sealer plate 18 and the upper end of the sealer plate 18. A bent hanging portion 17a is formed at the bottom. In order to transmit high frequency waves to the front yoke 22 and prevent dust from entering, a sealer film 21 is attached to the upper end of the door panel 17 to close the gap 26. This is a function that is delegated to you.

However, in the above conventional structure, the sealer film 21 is attached to a plurality of parts such as the door panel 17 and the sealer plate 18 with a gap 26 in between, and the sealer film 21 is attached to the structure of the door panel 17. Due to the above restrictions, it has been difficult and time-consuming to attach the sealer film 21. Furthermore, since the intervening portion 26 is formed by the door panel 17 and the sealer panel 18, it has brought about inconveniences such as requiring high precision in processing the door panel 17 and the sealer panel 18 and in assembling them.

In addition, in Japanese Patent Publication No. 55-10119, a sealer film is pasted on one entire surface of a sealer plate that has a notch along the outer periphery that serves as a hole.
A microwave oven door structure is disclosed in which the door panel is located on the same side of the sealer plate as the sealer film, and the microwave oven having this structure facilitates the work of attaching the sealer film. It is possible to do this without requiring particularly high precision of parts or assembly.

However, with the above microwave door structure,
Since the sealer film is held between the sealer plate and the door panel, the notch formed in the sealer plate is exposed to the outside. Therefore, in a microwave oven with this structure, dust, dirt, etc. tend to adhere to the periphery of the notch that forms a step in the sealer plate, requiring frequent cleaning. It has become difficult to clean the area. The ease with which it gets dirty and the difficulty in cleaning it make it extremely inconvenient for microwave ovens, which are devices that heat food. moreover,
In the above microwave oven door structure, the sealer plate made of a metal conductor is in contact with the front plate of the microwave oven body also made of a metal conductor, so there is a risk of sparks being generated when the door is opened and closed.

[Purpose of the invention] The present invention has been devised in consideration of the above-mentioned conventional problems, and can facilitate the work of applying a sealer film and significantly improve the accuracy of parts and assembly. It is an object of the present invention to provide a door structure for a microwave oven that is easy to clean, hard to get dirty, and free from the risk of sparks when the door is opened and closed.

[Structure of the idea]

In the microwave oven door structure of the present invention, a sealer film is affixed to the entire surface of one side of the sealer plate, which is the side facing the microwave oven body, and has a sealer plate with chiyoke holes along the outer periphery. teeth,
Along this line, a door panel having a partially U-shaped cross section is joined so as to close the U-shaped opening,
As a result, a chi yoke is formed in a space surrounded by a U-shaped section of the door panel and a sealer plate at a portion having the chi yoke hole.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

A door 2 is attached to the front of the microwave oven main body 1 so as to be openable and closable. The outer periphery of the door 2 is covered with a door screen 3, and inside the door panel 4, which has a ladle-shaped overall cross section and a U-shaped cross section, is disposed along the concave inner surface of the door screen 3. It is formed as follows. The door panel 4
is fixed to a sealer plate 5 provided inside thereof by screws or welding in a structure that partially closes an opening having a U-shaped cross section. The sealer plate 5 has a rectangular shape, and has short bent portions 6 toward the outside of the door on the four sides of the outer periphery.
Furthermore, as shown in FIG. 2, a large number of chiyoke holes 7 are opened along the outer periphery. A sealer film 8 is adhered to the entire surface of the cooking chamber 10 side of the sealer plate 5 for transmitting high frequency waves from the yoke holes 7 to the yoke 9 and for preventing the intrusion of dust and the like. A sealer plate 5 having a large number of sealer holes 7 to which the sealer film 8 is adhered, and a space surrounded by the U-shaped portion of the door panel 4 constitute a sealer plate 9. The sealer plate 5 to which the sealer film 8 is attached is attached to the front plate 12 in the top wall portion of the cooking chamber 10 formed by the outer frame 11, the front plate 12, and the top plate 13 when the door 2 is closed. is brought into contact with.

In the above configuration, when food is cooked in the microwave oven, the food stored in the cooking chamber 10 is heated by high frequency waves. At this time, high frequencies that tend to leak from the small gap between the front plate 12 on the top wall of the cooking chamber 10 and the sealer film 8 attached to the sealer plate 5 are removed by the front plate 12 and the sealer plate 5. Due to the action of the capacitive seal, leakage from the cooking chamber is suppressed. Furthermore, the leaked high frequency waves that have passed through the capacitive seal are transmitted through the sealer film 8 and guided from the yoke holes 7 to the yoke 9. Then, they are eliminated by mutual interference and cancellation within Chiyoke 9,
As a result, leakage of high frequency waves to the outside of the device is prevented.

[Effect of idea]

As described above, in the microwave oven door structure according to the present invention, a sealer film is pasted on the entire surface of one side of the sealer plate that has sealer holes along the outer periphery that faces the microwave oven body, and the other side of the sealer plate is attached with a sealer film. Near the outer periphery of the surface, a door panel with a U-shaped cross section is joined along this so as to close the U-shaped opening, so the sealer film is only attached to the sealer plate. This makes it easier to apply the sealer film, and also eliminates restrictions on the structure of the door panel. Further, since a sealer plate with a chiyoke hole opened in advance is used, there is no need to worry so much about component accuracy and assembly accuracy.

Also, since the sealer plate's hole is blocked by the sealer film on the door panel side,
The sealer film makes it difficult for external dust and dirt to adhere to the sealer film, and even if the sealer film becomes dirty, cleaning becomes easy because the sealer film is adhered to the entire surface of the sealer plate. Furthermore, since the above-mentioned sealer film is attached to the entire surface of the sealer plate on the side of the microwave oven body, the sealer plate comes into contact with the microwave oven body through the sealer film when opening and closing, which prevents sparks. This has the effect of eliminating the risk.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and is a sectional view taken along the line A-A in FIG. 3, and FIG. 2 is a perspective view of an embodiment of the sealer plate used in the present invention. 3 is a perspective view of a microwave oven, FIG. 4 is a sectional view of a main part showing a conventional example, and FIG. 5 is a sectional view of a main part showing another conventional example. 1 is a microwave oven body, 2 is a door, 3 is a door screen, 4 is a door panel, 5 is a sealer plate, 6 is a bent portion, 7 is a sealing hole, 8 is a sealer film, and 9 is a sealing plate.

Claims (1)

[Scope of utility model registration request] A sealer film is affixed to one entire surface of the sealer plate that has chiyoke holes along the outer periphery that faces the microwave oven body, and a part of the cross section is pasted along the outer periphery of the other side of the same sealer plate. A door structure for a microwave oven, characterized in that a door panel having a U-shape is joined so as to close a U-shape opening.