JPH07145943A - Microwave oven - Google Patents

Abstract

PURPOSE:To perform repair, exchange or the like of parts, which constitute high frequency radio wave supply means, without removing a partition plate. CONSTITUTION:An opening 14 is made in a bottom plate portion 13 of a heating chamber 12 formed by a body casing 11, and a partition plate 16 of glass is watertightly secured to a lower portion of the heating chamber 12 by means of a sealing member 17. A bottom plate assembly 18 provided with a mounting plate 20 of metal is detachably mounted to a lower portion of the body casing 11 by screws 18a. Mounted to the mounting plate 20 is a high frequency radio wave supply means 26 which comprises a magnetron 22, a radio wave reflective plate 24, a motor 23 for driving a stirrer fan 25, and the like. Repair, exchange or the like of an antenna 22a of the magnetron 22, the radio wave reflective plate 24 and the stirrer fan 25 is performed after the bottom plate assembly 18 is detached from the body casing 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven having a structure for supplying high frequency radio waves into a heating chamber from a high frequency radio wave supplying means provided at the bottom of the heating chamber through a partition plate.

[0002]

2. Description of the Related Art A conventional structure of a microwave oven of this type is shown in FIG. This product has the following configuration. That is, a main chamber 1 made of a metal plate is formed with a heating chamber 2 having an open front surface, and a bottom plate portion 2a of the heating chamber 2 is
A magnetron 3, a radio wave reflection plate 4, a motor 6 for driving a stirrer fan 5 for agitating radio waves, and the like, each of which constitutes high-frequency radio wave supply means, are provided. Of these, the antenna 3a of the magnetron 3, the radio wave reflection plate 4, and the stirrer fan 5 project upward from the bottom plate portion 2a.

A partition plate 8 made of glass is arranged in the lower part of the heating chamber 2 so as to cover the above-mentioned stirrer fan 5 and the like from above and to form a space 7 with the bottom plate 2a. This partition plate 8 is made of a sealing material 9 such as silicon.
It is fixed inside the heating chamber 2, and the outer peripheral portion is watertightly sealed over the entire circumference. The sealing material 9 is
This is to prevent water or soup from spilling on the partition plate 8 from entering the lower high frequency radio wave supplying means side. A door 10 that opens and closes the opening is provided on the front surface of the heating chamber 2.

In the above-mentioned structure, when cooking an object to be cooked, the object to be cooked is placed on the partition plate 8 in the heating chamber 2, the door 10 is closed, and a switch (not shown) is turned on. Manipulate. Then, the magnetron 3 and the motor 6 are driven, and the high-frequency radio waves emitted from the antenna 3a of the magnetron 3 are reflected by the radio wave reflection plate 4 and agitated by the stirrer fan 5 and irradiated onto the food to be cooked through the partition plate 8. Based on this, the food to be cooked is cooked.

[0005]

By the way, in the above-mentioned conventional structure, the high frequency radio wave supplying means such as the antenna 3a of the magnetron 3 located between the partition plate 8 and the bottom plate portion 2a, the reflection plate 4 and the stirrer fan 5 is provided. When the constituent members are repaired or replaced, the partition plate 8 needs to be removed from the main body case 1. However, since the partition plate 8 is fixed to the main body case 2 by the seal material 9, it is necessary to remove the seal material 9 over the entire circumference of the partition plate 8 in order to remove the partition plate 8, which is necessary for maintenance. There was a problem that workability was very poor.

Therefore, an object of the present invention is to provide a microwave oven capable of repairing or exchanging members constituting the high frequency radio wave supplying means without removing the partition plate and improving workability for maintenance. To provide.

[0007]

The microwave oven of the present invention comprises:
In order to achieve the above object, a main body case made of a metal plate in which a heating chamber is formed and an opening is formed in a bottom plate portion,
A partition plate formed of a material through which high-frequency radio waves are transmitted, fixedly arranged in the lower part of the heating chamber so as to cover the opening from above, and a partition plate that is watertightly sealed around the outer periphery, and the opening. A mounting plate made of a metal plate that is detachably mounted to the lower part of the main body case in a state of covering the part from below, and is provided so as to surround the opening part on substantially the entire periphery of the mounting plate for attenuating radio waves. A choke groove forming portion for forming a choke groove; and a high-frequency radio wave supplying means for supplying a high-frequency radio wave to the inside of the heating chamber through the partition plate so that at least a part of the mounting plate faces the partition plate. It is configured to do.

It is preferable that the choke groove forming portion of the mounting plate and the bottom plate portion of the heating chamber are in contact with each other on the outer peripheral side and form a gap communicating with the choke groove on the inner peripheral side. .

[0009]

When repairing or replacing the high frequency radio wave supplying means located below the partition plate, the mounting plate provided with the high frequency radio wave supplying means can be separated from the main body case. Therefore, it is not necessary to remove the partition plate fixed by the sealing material from the main body case, and of course it is not necessary to remove the sealing material.

On the other hand, in the above construction, since the opening is formed in the bottom plate of the heating chamber and the opening is covered from below by the mounting plate which is a member different from the main body case, the main body case and the mounting plate are separated from each other. There is a risk of electric wave leakage from the gap to the outside, but the electric wave leakage can be prevented by the choke groove provided in the mounting plate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 1 and FIG.
The body case 11 of the microwave oven is manufactured by welding a metal plate, in this case, a plurality of iron plates, and a heating chamber 12 having an open front surface is formed inside. Heating chamber 1
2 has a rectangular shape, and a rectangular opening 14 (see FIG. 1) is formed at the center of the bottom plate portion 13. In the lower portion of the heating chamber 12, a receiving portion 15 is provided in a frame shape over the entire circumference and is located above the bottom plate portion 13. The receiving portion 15 is provided with a partition plate 16 in the shape of a rectangular plate. Part 14
Is arranged so as to cover from above.

The partition plate 16 is made of a material that transmits high-frequency radio waves, in this case glass, and is sealed to the main body case 11 by a sealing material 17 such as silicon so that the outer peripheral portion is watertightly sealed over the entire circumference. Sealed and fixed.

A bottom plate assembly 18 is provided at the bottom of the body case 11.
Are detachably attached by screws 18a. As shown in FIG. 3, the bottom plate assembly 18 includes a box-shaped bottom case 19 having an open upper surface, a metal plate attached to the upper surface of the bottom case 19, and a mounting plate 20 made of an iron plate in this case. It is composed by. A large number of vent holes 21 are formed on the front surface of the bottom case 19.

A magnetron 22 and a motor 23 are attached to a substantially central portion of the attachment plate 20, and
A radio wave reflection plate 24 is provided so as to cover the antenna 22a of the magnetron 22 from above, and a stirrer fan 25 for radio wave agitation is attached to the rotation shaft of the motor 23. Here, the magnetron 22, the motor 23, the radio wave reflection plate 24, and the stirrer fan 25 are high-frequency radio wave supply means 26 for supplying high-frequency radio waves into the heating chamber 12.
Are configured.

Then, the bottom plate assembly 18 is attached to the main body case 11
1, a space 27 is formed between the partition plate 16 and the mounting plate 20, and the antenna 22a of the magnetron 22 of the high-frequency radio wave supplying means 26, The radio wave reflection plate 24 and the stirrer fan 25 are inserted into the partition plate 16 through the opening 14 of the bottom plate portion 13.
Is facing from below.

The mounting plate 20 has the opening 1
A choke groove forming portion 29 that forms a choke groove 28 for attenuating radio waves is formed in a rectangular frame shape so as to surround 4 over the entire circumference. The upper surface of the outer peripheral portion 29a of the choke groove forming portion 29 is formed to be slightly higher than the upper surface of the inner peripheral portion 29b, and the upper surface of the outer peripheral portion 29a comes into contact with the lower surface of the bottom plate portion 13, A gap 30 communicating with the choke groove 28 is formed between the upper surface of the portion 29b and the lower surface of the bottom plate portion 13.

Here, in the choke groove 28, the length dimension of the path shown by the arrow L in FIG.
It is set to be ¼ of the wavelength λ of the high frequency radio wave emitted from the antenna 22a.

A door 31 for opening and closing the front opening 12a of the heating chamber 12 is rotatably provided on the front surface of the body case 11, and an operation panel 32 having a plurality of switches 32a (see FIG. 2) is provided, and a louver 33 for intake and exhaust is attached to the front surface of the bottom plate assembly 18.

In the above structure, when the food to be cooked is cooked, the food to be cooked is placed on the partition plate 16 in the heating chamber 12, the door 31 is closed, and the switch 32a of the operation panel 32 is placed. To operate. Then, the magnetron 22 and the motor 23 are driven, and the antenna 2 of the magnetron 22 is driven.
The high-frequency radio wave emitted from 2a is reflected by the radio wave reflection plate 24 and is stirred by the stirrer fan 25, and is radiated to the food to be cooked through the partition plate 16, whereby the food to be cooked is cooked.

In the above structure, however, the partition plate 16
When repairing or replacing the members of the high-frequency radio wave supplying means 26 existing below the antenna, such as the antenna 22a of the magnetron 22, the radio wave reflecting plate 24, and the stirrer fan 25, which are present between the partition plate 16 and the mounting plate 20, Remove the screws 18a connecting the bottom plate assembly 18 and the main body case 11 to remove the bottom plate assembly 1
8 is separated from the main body case 11. As a result, as shown in FIG. 3, the antennas 22 of the magnetrons 22 are
Since a, the radio wave reflection plate 24, and the stirrer fan 25 are exposed, they can be easily repaired or replaced.

Therefore, without removing the partition plate 16 fixed to the main body case 11 by the seal material 17 from the main body case 12, and of course without removing the seal material 17, repair of the members constituting the high frequency radio wave supplying means 26. , Can be replaced, and workability for maintenance can be improved.

Further, in the above construction, the opening 14 is formed in the bottom plate 13 of the heating chamber 12, and the opening 14 is covered from below by the mounting plate 20 which is a member different from the main body case 11. There is a risk of electric wave leakage to the outside from between the case 11 and the mounting plate 20, but the electric wave leakage can be prevented by the choke groove 28 provided in the mounting plate 20.

Further, when the choke groove 28 is formed, the outer peripheral portion 29a is set to be slightly higher than the inner peripheral portion 29b, so that the outer peripheral portion 29a has a bottom plate portion 13 even if there are variations in size. Contact with
It is possible to reliably prevent radio waves from leaking to the outside.

[0024]

As is apparent from the above description, according to the present invention, when repairing or replacing the high frequency radio wave supplying means located below the partition plate, the mounting provided with the high frequency radio wave supplying means. Since it can be performed by separating the plate from the main body case, it is possible to perform repair, replacement, etc. of the members constituting the high-frequency radio wave supply means without removing the partition plate fixed by the sealing material from the main body case, Workability for maintenance can be improved.

Further, since the choke groove is provided in the mounting plate which is separable from the main body case, the electric wave from the space between the main body case and the mounting plate to the outside can be formed while the opening is formed in the bottom plate of the heating chamber. Leakage can be prevented by the choke groove.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which X in FIG.
-Vertical cross-sectional side view of the portion corresponding to the X-ray

FIG. 2 is a partially cutaway perspective view

FIG. 3 is a perspective view of the bottom plate assembly.

FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional configuration.

[Explanation of symbols]

11 is a main body case, 12 is a heating chamber, 13 is a bottom plate portion, 14
Is an opening, 16 is a partition plate, 17 is a sealing material, 18 is a bottom plate assembly, 20 is a mounting plate, 22 is a magnetron, 22a is an antenna, 24 is a radio wave reflection plate, 25 is a stirrer fan, 26
Is a high frequency radio wave supplying means, 28 is a choke groove, 29 is a choke groove forming portion, and 30 is a gap.

Claims (2)

[Claims] 1. A main body case made of a metal plate, which forms a heating chamber and has an opening formed in a bottom plate, and a material which allows high-frequency radio waves to pass therethrough. A partition plate that is fixedly arranged in a covering state and is watertightly sealed around the outer periphery of the partition plate, and a metal plate that is detachably attached to the lower portion of the main body case in a state of covering the opening from below. A mounting plate made of metal, a choke groove forming part that is provided so as to surround the opening around the entire periphery of the opening, and forms a choke groove for attenuating radio waves, and at least a part of the partition plate is the partition. A microwave oven, which is provided so as to face the plate, and which comprises a high-frequency radio wave supply means for supplying a high-frequency radio wave to the inside of the heating chamber through the partition plate. 2. The choke groove forming portion of the mounting plate and the bottom plate portion of the heating chamber are configured to contact each other on the outer peripheral side and form a gap communicating with the choke groove on the inner peripheral side. The microwave oven according to claim 1, wherein: