JPS5829593Y2 - High frequency heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency heating device, particularly a door portion thereof, and its purpose is to prevent radio wave leakage due to damage to the radio wave shielding body constituting the door screen.

In order to achieve this objective, the present invention presses the extension of the radio wave shield against the rear door plate by means of the extension of the transparent plate.

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

In Fig. 1, 1 is the main body case, and this main case 1
A heating chamber 2bS is provided inside.

A magnetron 3 is provided in the gap between the main body case 1 and the heating chamber 2, and the high frequency electromagnetic waves emitted from the magnetron 3 are absorbed by the food 4 in the heating chamber 2.

On the other hand, a door 5 is provided at the front opening of the heating chamber 2 so as to be openable and closable, and the specific structure of the door 5 is as shown in FIG. 2.

As shown in FIG. 2, the door 5 is composed of a front door plate 6 and a rear door plate 7, and both doors 6.7 are fixed with screws 9 fastened to a fixture 8.

Due to this fixation, the door screen 1° is held between the front door plate 6 and the rear door plate 7. Next, this door screen 10 will be described in detail.

This door screen 10 is composed of a net-shaped radio wave shield body 11 and transparent plates 12 and 13 made of heat-resistant glass that sandwich the radio wave shield body 11 therebetween.

Of these, only the peripheral edges of the transparent plate 12 and the radio wave shield body 11 are held by the front door plate 6 and the rear door plate 7 at the sandwiched portion A.
extended outwards.

Thereafter, the extension 11a of the radio wave shield 11 is held between the fixture 8 and the rear door plate 7 by the screws 9, and the extension 12a of the transparent plate 12! The extension part 11a of the radio wave shield body 11 is pressed against the rear door plate 7.

In FIG. 2, reference numeral 14 is a backing provided at the peripheral edge of the transparent plate 13, and this backing 14 prevents the vapor of the food 4 from entering between the transparent plates 12 and 13.

Further, 15 is a radio choke part provided at the periphery of the door 5 to prevent radio wave leakage from inside the heating chamber 2, and 16 is a door abutment plate with which the periphery of the rear door plate 7 comes into contact.

In the above configuration, conventionally, the extension part 12a of the transparent plate 12 is not provided as shown in FIG. 5, and therefore, the extension part 11a of the radio wave shielding body 11 is not in close contact with the rear door plate 7, but is in contact only at several points. become.

Therefore, when the high-frequency electromagnetic waves in the heating chamber 2 pass through the transparent plate 13 and the radio wave choke part 15 as shown by arrows A and I and reach this extension part 11a, a spark is generated at this part, and finally the extension part A hole etc. will be made in 11a.

As a result, high-frequency electromagnetic waves leaked out of the heating chamber 2 as indicated by the arrows through this hole and the transparent plate 12, which was dangerous.

Therefore, in the present invention, the extension part 11a of the radio wave shield body 11 is pressed against the rear door plate 7 by the extension part 12a of the transparent plate 12.

As a result, the extension part 11a of the radio wave shield body 11 comes into close contact with the rear door plate 7, so that sparks are not generated in this part and radio wave leakage can be prevented as in the conventional case.

3 and 4 show another embodiment of the present invention. In this embodiment, the fixture 8 is provided with a locking portion 8a, and this locking portion 8a and the rear door plate 7 are connected to the outer peripheral edge of the transparent plate 12a. It is sandwiched between.

In other words, in this embodiment, if the transparent plate 12 is made of soft plastic or the like, the extension 12a of the transparent plate 12 will curve as shown by the broken line and will no longer press the extension 11a of the radio wave shield 11, preventing this. It was established for the purpose of

As a result, as in the above embodiment, the extension portion 1 of this transparent plate 12
2a, the extension part 11a of the radio wave shield 11 was pressed against the rear door plate 7, and spark generation could be prevented at this part'.

Furthermore, when the extension part 12a is lifted up by the locking part 8a of the fixture 8 as described above, the slit S provided in the extension part 12a of the transparent plate 12 can also be formed in the part of the clamping part A of the transparent plate 12. is lifted in the direction of the arrow by force f, and is provided to prevent this.

In other words, when the transparent plate 12 at the clamping part A is lifted in the direction of the arrow, a gap is created between the transparent plate 12 and the front door plate 6, and as a result, dust can enter the clamping part. This slit S is provided to prevent the clamping force F at A from becoming weak.

As a result, only the extension part 12a is lifted up with this slit S part as a boundary and is bent slightly to the right in FIG.
In this figure, the transparent plate 12 below the slit S portion is not lifted by the force f.

Therefore, in the holding part A, the transparent plate 12 and the front door plate 6
There is no gap between the two, and as a result, it is possible to prevent dust from entering from the clamping part A and weakening of the clamping force F in the clamping part A.

As described above, according to the present invention, a hole or the like is not made in the extension of the radio wave shield due to spark generation, and therefore high frequency electromagnetic waves do not leak from this hole as in the conventional case.

Moreover, since the structure is simple, simply providing an extension part on a transparent plate, it is inexpensive and has good workability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a high-frequency heating device according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of part of FIG. 1, and FIG. 3 is a sectional view of a high-frequency heating device according to another embodiment of the present invention FIG. 4 is a rear view of the main parts of the same device, and FIG. 5 is a cross-sectional view of the main parts of a conventional high-frequency heating device. 2... Heating chamber, 5... Door, 6...
...Front door plate, 7...Rear door plate, 8...
・Fixing tool, 10...Door screen, 11...
...Radio wave shield body, 12.13...Transparent plate, S...Slit.

Claims (1)

[Scope of utility model registration request] It has a heating chamber, a door provided at the front opening of the heating chamber, and a door screen provided on the door and configured by attaching a radio wave shield to the back of a transparent plate, It is composed of a door plate and a rear door plate, and the peripheral edge of the door screen is sandwiched between the front door plate and the rear door plate, while the transparent plate of the door screen and the peripheral edge of the radio wave shield are outside of this sandwiching part. A slit is provided in the extension part of the radio wave shield body, and this extension part is pressed against the rear door plate by the extension part of the transparent plate, and the outer peripheral edge of the extension part of the transparent plate is pressed against the rear door plate. A high-frequency heating device that is sandwiched between the provided fixture and the rear door plate.