JPH08148274A - High frequency heating apparatus - Google Patents

Abstract

PURPOSE: To make it visible that there are two high frequency radiating outlets even with eyes even though these two high frequency radiating outlets are covered with a single sheet of a radiating outlet cover. CONSTITUTION: Two high frequency radiating outlets 20, 21 formed in a right side plate 13a composing a right side wall of a heating chamber 14 are covered collectively with one sheet of a radiating outlet cover 24. A projected part 29 projected toward the heating chamber 14 is formed in the middle part 13b of the right side plate 13a existing between the high frequency radiating outlets 20, 21 and a hole 30 which excapes the projected part 29 is formed in the radiating outlet cover 24. Since the radiating outlet cover 24 is divided upside and downside by the projected part 29 and the hole 30, it can be found in appearance that there are two high frequency radiating outlets 20, 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating apparatus having a plate member forming a wall of a heating chamber, two high-frequency radiation ports, and a radiation port cover attached to the high-frequency radiation ports.

[0002]

2. Description of the Related Art A conventional structure of a microwave oven which is a high-frequency heating device of this type will be described with reference to FIGS. The heating chamber 1 is formed in a rectangular box shape with a front surface opened by a metal plate member 2. The side plate 2a forming the side wall of the heating chamber 1 has two high frequency radiation ports 3a, 3 formed of through holes.
b are formed to be vertically adjacent to each other. Both of the high-frequency radiation ports 3a and 3b have a rectangular shape that is long in the front-rear direction. A waveguide 4 is attached to the outer surface of the side plate 2a so as to cover the two high-frequency radiation ports 3a and 3b, and a magnetron 5 is attached to the waveguide 4. The antenna 5 a of the magnetron 5 faces the inside of the waveguide 4.

Inside the heating chamber 1 in the side plate 2a, two radiation port covers 6a and 6b made of a material permitting the passage of high frequencies, for example, mica, and two high frequency radiation ports 3a and 3b are provided.
Are arranged so as to individually cover. In these radiation port covers 6a and 6b, engaging protrusions 7 and 7 provided at both ends in the longitudinal direction are inserted into insertion holes 8 formed in both ends in the longitudinal direction of each high-frequency radiation port 3a and 3b. It is attached to the side plate 2a by engaging them.

[0004]

However, the above-mentioned conventional structure has a drawback in that it requires two radiation port covers 6a and 6b and that the radiation port covers 6a and 6b need to be attached at two places, which makes the attachment troublesome. It was

In order to deal with such a situation, it is conceivable to cover the two high frequency radiation ports 3a and 3b with a single radiation port cover. However, in this case, it becomes impossible to visually recognize that there are two high-frequency radiation ports 3a and 3b.

Further, in this way, the two high-frequency radiation ports 3 are provided.
When the heating chamber 1 is downsized in the one provided with a and 3b, the width of the intermediate portion 2b of the side plate 2a located between the high-frequency radiation ports 3a and 3b also becomes narrower, and accordingly, the intermediate portion 2b The mechanical strength of. Therefore, in order to increase the mechanical strength of the intermediate portion 2b, for example, if a protrusion is provided, the protrusion is pressed by the radiation port cover, so that so-called sticking easily occurs.
If the intermediate portion 2b is pegged, the peripheral portions of the high frequency radiation ports 3a and 3b located above and below the intermediate portion 2b are also liable to be peked. In this manner, when the side plate 2a has a peculiar portion in the middle part 2b or the peripheral part of the high-frequency radiation ports 3a, 3b, a gap is generated between the side plate 2a and the radiation port cover, and the waveguide 4 is inserted through the gap. Dust or the like easily enters the side, and when dust or the like enters, it may be carbonized and sparks may be generated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide two high frequency radiation ports, and these two high frequency radiation ports with a single radiation port cover. Even though it is covered, it is possible to visually recognize that there are two high-frequency radiation ports, the plate material between the two high-frequency radiation ports can be reinforced, and a gap is generated between the plate material and the radiation port cover. It is an object of the present invention to provide a high-frequency heating device capable of preventing such a situation as much as possible.

[0008]

In the high frequency heating apparatus of the present invention, at least a part of the wall is formed by a plate material and a plate material forming the wall of the heating chamber is formed so that two of them are adjacent to each other. And two high-frequency radiation ports formed of through-holes for supplying the high-frequency waves generated by the magnetron into the heating chamber, and the plate member located between these two high-frequency radiation ports protruding toward the heating chamber. And a plate member formed of a material that allows the passage of the high frequency and having the high frequency radiation port formed therein so that the two high frequency radiation ports are collectively covered inside the heating chamber. It is characterized in that it is provided with a radiation port cover attached to the radiating port cover and a hole formed at a portion of the radiation port cover corresponding to the ridge portion so as to escape the ridge portion. Invention of Item 1).

In this case, it is preferable that the plate member to which the radiation port cover is attached has a concave step portion at a portion corresponding to the outer peripheral portion of the radiation port cover (the invention of claim 2). Further, it is preferable that the ridge portion is provided so as to extend along the longitudinal direction of the high-frequency radiation port (the invention of claim 3).

The radiation port cover may be attached by engaging and engaging an engaging convex portion provided at one end with an insertion portion formed in the plate material and screwing the other end portion to the plate material (claim (Invention of claim 4), or engaging projections are provided at both ends in the longitudinal direction of the radiation port cover, and the radiation port cover has the engaging projections at both ends inserted into the insertion portion formed in the plate member. It is preferable to attach them by combining them (the invention of claim 5).

[0011]

According to the above-mentioned means, since the two high-frequency radiation ports are collectively covered by the radiation port cover, only one radiation port cover is required, and the mounting position is also one. Good. Further, since the radiation port cover is divided by the protrusion provided on the plate material and the hole formed so as to escape the protrusion, it can be seen that there are two high-frequency emission ports. You can

Furthermore, by providing a ridge on the plate member between the two high-frequency radiation ports, that portion can be reinforced. Further, by forming a hole in the radiation port cover that escapes the protrusion, it is possible to prevent the sheet material from sticking and to prevent a gap from being generated between the plate material and the radiation port cover. It can be prevented as much as possible.

According to the second aspect of the present invention, in the plate member to which the radiation port cover is attached, when the concave step portion is provided at the portion corresponding to the outer peripheral portion of the radiation port cover, the radiation is generated by the step portion. The positioning when attaching the mouth cover is ensured, and the strength of the plate side is increased.

When the ridge portion is provided so as to extend along the longitudinal direction of the high frequency emission port as in the third aspect of the invention, the strength of the plate material between the two high frequency emission ports can be further effectively increased. .

According to a fourth aspect of the present invention, the radiation port cover is inserted into and engaged with the insertion protrusion formed at one end of the radiation projection cover, and the other end is screwed to the plate. When it is attached by doing so, positioning can be performed by inserting and engaging the engaging convex portion of the one end with the insertion portion, and it becomes easy to screw.

Further, as in the invention of claim 5, engaging projections are provided at both ends in the longitudinal direction of the radiation port cover, and the radiation port cover is formed with the engaging projections at both ends on a plate material. When it is mounted by inserting and engaging with the insertion portion, there is an advantage that a screw is not necessary.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 4 showing the overall appearance.
In the main body 11 of the microwave oven, which is a high-frequency heating device
Includes an outer case 12 having a rectangular box shape with an open front surface, and an inner case 13 formed with a metal plate to have a rectangular box shape with an open front surface. The inside of the case 13 serves as a heating chamber 14. Therefore, each wall of the heating chamber 14 is formed by the plate material.

A door 15 for opening and closing a front opening of the heating chamber 14 is rotatably provided on the front surface of the main body 11, and an operation panel 16 is provided on the right side of the door 15.
The operation panel 16 is provided with a display 17 and a switch 18, and a machine room 19 is provided behind the operation panel 16.
(See FIG. 1) are formed.

Inner case 1 forming the right side wall of the heating chamber 14.
As shown in FIG. 1 and FIG. 2, the right side plate 13a of No. 3 is formed with two high-frequency radiation ports 20 and 21 formed of through holes so as to be vertically adjacent to each other. These high frequency emission ports 20,
Both 21 have a rectangular shape that is long in the front-rear direction, and the high-frequency radiation port 20 on the upper side is formed narrower than the high-frequency radiation port 21 on the lower side.

On the outer surface side (machine room 19 side) of the right side plate 13a, a waveguide 22 is attached by, for example, spot welding so as to cover the two high-frequency radiation ports 20 and 21.
A magnetron 23 is attached to the waveguide 22. The antenna 23a of the magnetron 23 is a waveguide 22
The high-frequency wave radiated from the antenna 23a facing the inside passes through the waveguide 22 and the two high-frequency radiation ports 20,
21 is supplied into the heating chamber 14.

Inside the heating chamber 14 in the right side plate 13a, a single rectangular radiation port cover 24 made of a material permitting the passage of high frequencies, for example, mica, is used to package the two high frequency radiation ports 20 and 21 together. And it is arranged so that it may be covered.
As shown in FIG. 3, the radiation port cover 24 includes two engaging projections 25 provided at the rear end in the longitudinal direction of the right side plate 1.
It is attached to the right side plate 13a by inserting and engaging in the insertion holes 26, which are insertion portions formed in 3a, and tightening the screws 27 at the front end.

Here, in the right side plate 13a, at the portion corresponding to the outer peripheral portion of the radiation port cover 24, the radiation port cover 2 is provided.
A step portion 28 having a concave shape is formed so as to be recessed outward by about the plate thickness of No. 4, and by this step portion 28, the radiation port cover 2 is formed.
The outer peripheral part of 4 is received. Therefore, the right side plate 13
The surface of the radiation port cover 24 on the heating chamber 14 side and the surface of the radiation port cover 24 on the heating chamber 14 side are substantially flush with each other.

Further, in the right side plate 13a, in the intermediate portion 13b located between the two high frequency radiation ports 20 and 21,
The ridge portion 29 projecting inside the heating chamber 14 has the high-frequency radiation port 2
It is provided so as to extend along the longitudinal direction of 0, 21 (front-back direction). And in the radiation port cover 24,
A long hole-shaped hole 30 that escapes the protrusion 29 is formed at a portion corresponding to the protrusion 29, and the hole 30 is fitted into the protrusion 29.

On the right side plate 13a, a circular projection 31 is provided at a portion of the magnetron 23 facing the antenna 23a so as to be located above the radiation port cover 24 and project into the heating chamber 14. There is.

According to such a first embodiment, the following effects can be obtained. That is, the two high-frequency radiation ports 2 are formed in the right side plate 13a forming the right side wall of the heating chamber 14.
0 and 21 are formed, and those 2
Each high-frequency radiation port 20 and 21 is replaced by a single radiation port cover 24.
Therefore, the radiation port cover 24 need only be one, and only one mounting position is required, which facilitates mounting. Further, since the radiation port cover 24 is divided into the upper and lower parts by the ridge portion 29 and the hole portion 30 formed so as to escape the ridge portion 29, the high frequency radiation ports 20 and 21 cannot be directly seen. However, it can be seen that there are two high-frequency radiation ports 20 and 21.

In particular, the amount of the high frequency waves radiated from the one high-frequency radiation outlet differs from that of the two high-frequency radiation outlets. Therefore, when the radiation outlet is two, the frozen food is thawed. There is a model that does not require a decompression network to be used when doing, and in such a case, it is possible to judge whether or not the decompression network is used at a glance, which is advantageous.

The middle portion 13b of the right side plate 13a existing between the two high-frequency radiation ports 20 and 21 is a portion where the mechanical strength is weakened due to the upper and lower openings, but the ridge portion 29
By providing, the intermediate portion 13b can be reinforced. Moreover, in this case, since the ridge portion 29 is provided so as to extend along the longitudinal direction of the high-frequency emission ports 20 and 21, the strength of the intermediate portion 13b can be increased more effectively.

Then, the projection 2 is formed on the radiation cover 24.
By forming the hole portion 30 for escaping the groove 9, it is possible to prevent the occurrence of sticking on the right side plate 13a side while providing the ridge 29 on the intermediate portion 13b, and to radiate with the right side plate 13a. It is possible to prevent a gap from being formed between the mouth cover 24 and the mouth cover 24 as much as possible.

Further, the right side plate 13a is provided with the concave step portion 28 at a portion corresponding to the outer peripheral portion of the radiation port cover 24, so that the radiation port cover 24 is formed by the step portion 28.
The positioning at the time of attaching is secured, and the strength on the right side plate 13a side is increased. As the strength of the right side plate 13a increases, it becomes easier to spot weld the waveguide 22. Furthermore, since the radiation port cover 24 and the right side plate 13a around it are substantially flush with each other,
There is also an advantage that the inside of the heating chamber 14 can be easily cleaned.

In the radiation port cover 24, the engaging convex portion 25 provided at one end is inserted and engaged with the insertion hole 26 formed in the right side plate 13a, and the other end is screwed to the right side plate 13a.
Since it is attached by fixing it by 7, the positioning can be performed by inserting and engaging the engaging convex portion 25 at one end into the insertion hole 26, and the screw 27 can be easily fixed, and by extension, the radiation port cover. It becomes easy to attach 24.

FIG. 5 shows a second embodiment of the present invention. This second embodiment differs from the above-mentioned first embodiment in the following points. That is, the radiation port cover 24 is provided with two engagement protrusions 25 at one end in the longitudinal direction and one engagement protrusion 32 at the other end as well. 24 is attached to the right side plate 13a by bending and engaging the engaging protrusions 25 and 32 with the insertion holes 26 (see FIG. 3) formed in the right side plate 13a.

According to the second embodiment, there is an advantage that the screw 27 of the first embodiment is unnecessary. In addition, the engaging protrusion 25,
Since 32 is provided at both ends of the radiation port cover 24 in the longitudinal direction, the radiation port cover 24 can be easily bent and easily attached.

The present invention is not limited to the above-mentioned embodiments, and for example, three high-frequency radiation ports may be provided.

[0034]

According to the first aspect of the present invention, since the two high-frequency radiation ports are collectively covered by the one radiation port cover, only one radiation port cover is required and the radiation port cover is mounted. Only one place is required, and mounting becomes easy.
Further, since the radiation port cover is divided by the ridges provided on the plate and the holes formed so as to escape the ridges, it can be seen that there are two high-frequency radiation ports. You can

Furthermore, by providing a ridge on the plate material between the two high-frequency radiation ports, that portion can be reinforced. By forming a hole in the radiation port cover that escapes the protrusion, it is possible to prevent the sheet material from sticking and to prevent a gap from being generated between the plate material and the radiation port cover. It can be prevented as much as possible.

According to the second aspect of the invention, in the plate member to which the radiation port cover is attached, the recessed step portion is provided in the portion corresponding to the outer peripheral portion of the radiation port cover, and the radiation port is formed by the step portion. The positioning when attaching the cover will be reliable, and the strength of the plate side will be increased.

According to the third aspect of the present invention, since the ridge portion is provided so as to extend along the longitudinal direction of the high frequency emission port, the strength of the plate member between the two high frequency emission ports can be increased more effectively.

According to the fourth aspect of the invention, the radiation port cover is inserted and engaged with the engaging convex portion provided at one end of the insertion portion formed in the plate member, and the other end is screwed to the plate member. By doing so, it becomes possible to position by inserting and engaging the engaging convex part of the one end with the insertion part, and it is easy to screw in, and it is easy to attach the radiation port cover. Become.

According to the fifth aspect of the present invention, engaging projections are provided at both ends of the radiation port cover in the longitudinal direction, and the radiation port cover is inserted with the engaging projections at both ends formed on the plate material. There is an advantage that the screw is not necessary because it is attached by inserting and engaging with the portion. Further, since the radiation port cover can be easily bent, there is an advantage that it can be easily attached.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of essential parts showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a main part.

FIG. 3 is a sectional view taken along line XX in FIG.

FIG. 4 is a perspective view of the entire appearance.

FIG. 5 is a view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional configuration.

FIG. 7 is a side view of a radiation port cover portion.

[Explanation of symbols]

Reference numeral 11 is a main body, 13 is an inner case, 13a is a right side plate (plate material), 13b is an intermediate part, 14 is a heating chamber, 20 and 21 are high-frequency radiation ports, 23 is a magnetron, 24 is a radiation port cover, and 25 is an engaging protrusion. Reference numeral 26 is an insertion hole (insertion portion), 27 is a screw, 28 is a stepped portion, 29 is a ridge portion, 30 is a hole portion, and 32 is an engaging convex portion.

Claims (5)

[Claims] 1. A heating chamber having at least a part of a wall made of a plate material, and two plates adjacent to a plate material forming the wall of the heating chamber, wherein a high frequency generated by a magnetron is applied to the heating chamber. Two high-frequency radiation ports formed of through-holes for supplying to the heating chamber, and a ridge provided on the plate member located between the two high-frequency radiation ports so as to project toward the heating chamber, A radiation port cover which is made of a material that allows high-frequency radiation to pass through, and is attached to the heating chamber of the plate member on which the high-frequency radiation port is formed so as to collectively cover the two high-frequency radiation ports, and the radiation port. A high-frequency heating device, comprising: a hole corresponding to the protruding portion of the cover and a hole formed to escape the protruding portion. 2. The high-frequency heating device according to claim 1, wherein the plate member to which the radiation port cover is attached is provided with a concave step portion at a portion corresponding to the outer peripheral portion of the radiation port cover. 3. The high-frequency heating device according to claim 1, wherein the protrusion is provided so as to extend along the longitudinal direction of the high-frequency radiation port. 4. The radiation port cover is attached by inserting and engaging an engaging convex portion provided at one end portion with an insertion portion formed in the plate material and screwing the other end portion to the plate material. The high frequency heating device according to any one of claims 1 to 3, characterized in that. 5. The engaging projections are respectively provided at both ends of the radiation port cover in the longitudinal direction, and the radiation port cover inserts and engages the engaging projections at the both ends with an insertion portion formed on a plate material. The high-frequency heating device according to claim 1, wherein the high-frequency heating device is attached by means of.