JPS62100983A - Door of radio frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the structure of a door that can be opened and closed in a high-frequency heating device such as a microwave oven.

Conventional technology Generally, the door of a high-frequency heating device such as a microwave oven has a large number of small holes in the center through which the inside of the heating chamber can be seen, and the periphery thereof is an integrally formed metal door body with a chalk groove shaped like a frame. The choke groove has an opening in a portion facing the front plate provided around the opening of the heating chamber, and a dielectric cover is attached to cover this opening. Further, a frame-like decorative frame made of resin or the like is provided around the outer periphery of the door body, and a transparent plate such as a glass or resin plate is provided in the decorative frame. At this time, the decorative frame and the transparent plate may be fixed by adhesion, welding, or the like, or may be integrally molded simultaneously using resin or the like.

As shown in FIG. 3, the metal door body 1 is provided with an inner wall and an outer wall 2 around which form a choke groove.
The dielectric cover 3 covering the choke groove opening and the outer peripheral decorative frame 4 are located on the inside and outside of the outer wall 2, and are fixed by hooking them into a cutout hole etc. provided in a part of the outer wall 2 with a nail or the like. Or, they were mainly fixed to parts of the door that are normally invisible, such as the bottom or right side of the door, using screws or the like.

Problems to be Solved by the Invention In the above-mentioned door configuration, there is a gap between the decorative frame 4 of the door and the outer circumferential wall 2 of the door body, and between the outer circumferential wall 2 and the choke groove cover 3. arise.

That is, the decorative frame 4 and the choke groove cover 3 are usually made of resin and have some elasticity in the outer or inner circumferential direction, but the choke groove outer wall 2 of the door body 1 is made of metal and is fixed. In the assembled state, a gap may easily occur between the resin parts and the outer wall of the door body depending on variations in warpage or strain of the resin parts.

This gap is unsightly when the door is opened, and when food is cooked in a microwave oven, food scraps can get caught in the gap and cause stains, and when charred by heat, it can cause sparks due to high frequency waves. There is also.

Means for Solving the Problems In the present invention, the height of the outer wall of the door body is lowered so that the outer periphery of the chalk groove cover and the inner wall of the decorative frame are directly connected to each other. The surface in contact with the bottom of the groove and the inner circumferential wall surface outside the groove cover are at right angles, and the inner circumferential wall of the decorative frame is at right angles to the outer circumferential wall of the chalk groove of the door body before assembly. It has a shape that expands outward.

When the functional decorative frame is attached to the metal door body, the part that is pushed by the bottom of the choke groove and comes in contact with the bottom of the choke groove becomes parallel to the bottom of the choke groove, so that the inner circumferential wall closes inward and the choke groove is closed. It adheres closely to the outer periphery of the cover and constantly applies force inward, making it possible to eliminate gaps on the back side of the door.

Example An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a metal door body 6 has a large number of small holes 6 in the center for looking into the heating chamber, and chalk grooves 7 are formed in the shape of a frame on the four sides of the periphery.

The choke groove 7 has a bottom surface 8 in the front direction of the door, and has a bottom surface 8 on the outer peripheral wall.
9 is low and includes a slit plate 11 having slits and square holes 10 alternately so as to be in close contact with this outer peripheral wall 9.

The choke groove 7 has an opening 12 on the side of the heating chamber, and a high frequency wave is introduced into the opening 12 and attenuated within the choke groove 7.

The resin dielectric cover 13 covering the choke groove opening 12 is
Several claws 14 are partially provided on its outer periphery, and these claws 14 are hooked into square holes 10 in the slit plate 11 and fixed. Therefore, the outer periphery of the dielectric cover 13 is located further outward than the outer wall 9 of the metal door body 6.

On the other hand, the resin decorative frame 16 inserted from the front of the door body 6 is
It has a surface 16 that faces and comes into contact with the choke groove bottoms 8 of the group, and a frame side 17 that makes a substantially right angle θ thereto. A transparent plate 18 made of glass or acrylic is fixed to the front surface of the decorative frame by adhesive or the like. Surface 16 of decorative frame 16
is formed at an angle θ2 (θ2〉o) with respect to the vertical plane, and the inner peripheral wall of the frame side 17 is integrally formed to have approximately the same dimensions as the outer periphery of the dielectric cover 13. The inner circumferential wall has claws 19 partially directed inward.
This claw 19 is located at a position where it can be hooked onto the tip of the outer wall 9 of the door body.

In the door constructed as four parts in this way, the dielectric cover 13 is first attached to the door body 6. Next, when the decorative frame 16 is inserted so as to cover the front surface of the door main body 6, the surface 16 in contact with this is pushed by the chalk groove bottom surface 8 and becomes parallel to the chalk groove bottom surface 8, and the claw 19
As a result, the claw is caught on the outer wall 9 of the door body, and the claw and the surface 16 are fixed, and the angle θ2 becomes 0. That is, the frame side 17 is thereby subjected to a forced force directed inward using the corner portion of the cross section of the decorative frame 16 as a fulcrum, and therefore the outer periphery of the decorative frame closes inward; Since the dielectric cover 13 is inserted in advance, its outer peripheral wall is pressed down by the elastic force of the decorative frame 15. As shown in FIG. 2, if the dielectric cover 13 is not present, the decorative frame 16 will come to the position shown by the broken line. At this time, the force when applying a displacement corresponding to the size of the frame becomes the force that presses the dielectric cover 13 of the decorative frame 16.

The chalk groove bottom surface 8 of the door body 6 and the surface 16 of the decorative frame can be more firmly fixed by adhering.

Furthermore, by bonding the transparent plate 18 to the front surface of the decorative frame 16, the flatness of the decorative frame 16 is more firmly maintained together with the rigidity of the transparent plate 1B.

Effects of the Invention As described above, according to the present invention, the following effects can be expected. Since it is held down by the door, there is no gap on the back side of the door, which eliminates electrical discharge caused by insertion of foreign objects and carbonization.

(2) Since the dielectric cover is always pressed down by the elasticity of the decorative board, no gap will be created even if there is a small amount of thermal expansion.

(3) When integrally molding the decorative frame, it has a shape that expands toward the inside, and can be molded with a reasonable and simple configuration as a molding die.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of the door before assembly according to the embodiment of the present invention;
The figure is a plan view of the door after assembly, and FIG. 3 is a partial sectional view of a conventional door. 6...Door body, 8...Choke groove bottom, 9...Choke groove outer wall, 13...Dielectric cover, 16... makeup frame.

Claims (1)

[Claims] It has a claw that hooks onto the outer wall of the metal body of the door, the inner circumferential wall of which is approximately the same size as the outer circumference of the dielectric cover covering the choke groove opening, and a hook that is attached to the bottom of the choke groove that is perpendicular to the inner circumferential wall. A decorative frame is provided whose abutting surface is inclined inward at a slight angle with the vertical plane before assembly, the dielectric cover is attached to the door body, and the decorative frame is then inserted from the front of the door. Door device for high frequency heating equipment.