JPH11307237A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a discharge from occurring in a place where it should not. SOLUTION: A magnetron is connected to a waveguide 56 and microwaves emitted by the magnetron are guided. A fixed member 54 has between the end 571 of the top plate 570 of a heating chamber 50 and an antenna shaft 53 a shield part 540 for shielding the end 571 from the antenna shaft 53. The thickness of the top plate 570 is about 0.4 mm. The shield part 540 is extended about 5 mm above the end 571 in order to surely shield the end 571 of the top plate 570. Therefore, foreign matter such as fragments of solder is unlikely to enter between the end 571 and the antenna shaft 53. Even if such foreign matter has entered, a discharge at that site does not occur since the end 571 is shielded by the shield part 540 from the antenna shaft 53.

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 device such as a microwave oven, and more particularly to a device for penetrating a wall constituting a heating chamber and supporting an antenna for radiating radio waves emitted by a high-frequency oscillator. The present invention relates to a high-frequency heating device including an antenna shaft.

[0002]

2. Description of the Related Art Some conventional high-frequency heating apparatuses include a high-frequency oscillator, such as a magnetron, for emitting high-frequency radio waves, and an antenna for radiating the radio waves generated by the high-frequency oscillator. Further, in some conventional high-frequency heating devices, an antenna is connected to a motor and configured to be rotatable.

[0003] The antenna is provided inside the heating chamber, but the motor is usually provided outside the heating chamber. Therefore, the motor and the antenna are connected by an antenna shaft for supporting the antenna and transmitting the driving force of the motor to the antenna.

FIG. 4 is a schematic diagram for explaining connection between an antenna and an antenna of a motor in a microwave oven as an example of a conventional high-frequency heating device. 56 in the figure
Is a waveguide, which is shown partially broken. A magnetron (not shown) is connected to the waveguide 56. The radiation antenna 51 is provided to radiate the microwave emitted from the magnetron into the heating chamber 50.

[0005] The antenna shaft 53 has a cylindrical shape, is provided to support the radiation antenna 51 and transmit the driving force of the motor 52 to the radiation antenna 51. Note that the radiation antenna 51 is fixed to the antenna shaft 53 by a screw 55. The radiation antenna 51 is connected to a motor 52 and can rotate. And since the radiation antenna 51 is rotatable, the microwave emitted by the magnetron is:
The radiation is uniformly emitted into the heating chamber 50.

[0006] The fixing member 59 is a member having a hole corresponding to the antenna shaft 53, and its longitudinal section is shown.
The antenna shaft 53 is fitted into the fixing member 59, and the projection 59 a of the fixing member 59 is fitted into a proper position on the top plate 570 of the heating chamber 50, so that the heating chamber 5
0 is fixed to the top plate 570. Note that the antenna shaft 53 is fixed to the fixing member 5 so that the positional relationship with the fixing member 59 is maintained.
9 is provided with a convex portion 53a for hooking.

[0007]

However, in the conventional high-frequency heating device configured as shown in FIG. 4, the end portion 571 of the top plate 570 facing the antenna shaft 53 and the antenna shaft 53 There was a case where a metal piece such as a piece of solder used for welding another part was present due to being blown by the wind or the like. In addition, the top plate 570 and the antenna shaft 53 are made of metal from the viewpoint of strength and heat resistance. In such a case, if the magnetron emits microwaves, a discharge occurs in a place between the end portion 571 and the antenna shaft 53 where discharge should not occur, which is dangerous. Was.

The present invention has been conceived in view of the above circumstances, and an object of the present invention is to provide a high-frequency heating device capable of preventing discharge from occurring in a place where it should not occur.

[0009]

According to a first aspect of the present invention, there is provided a high-frequency heating apparatus, comprising: a heating chamber for accommodating an object to be heated;
A high-frequency oscillator that emits high-frequency radio waves to heat the object to be heated, an antenna for emitting high-frequency radio waves emitted by the high-frequency oscillator into the heating chamber, and penetrates a wall surface that forms the heating chamber, An antenna shaft for supporting an antenna, and a shielding member for shielding an end of the wall surface constituting the heating chamber near a penetrating portion of the antenna shaft from the antenna shaft are provided.

According to the first aspect of the present invention, the end of the wall constituting the heating chamber near the penetrating portion of the antenna shaft is shielded from the antenna shaft by the shielding member.

This makes it difficult for foreign matter to enter between the vicinity of the antenna shaft penetrating portion of the heating chamber wall surface and the antenna shaft, which has conventionally caused unexpected discharge due to the entry of foreign matter. However, it is possible to avoid occurrence of discharge at the place.

According to a second aspect of the present invention, in addition to the configuration of the high-frequency heating apparatus according to the first aspect of the present invention, the antenna shaft is fixed to a wall surface constituting the heating chamber. Wherein the shielding member is integrally formed with the fixing member.

According to the invention described in claim 2, according to claim 1
In addition to the effect of the invention described in the above, the shielding member is provided integrally with a fixing member for fixing the antenna shaft to the wall surface constituting the heating chamber.

Thus, in addition to the effect of the first aspect, the number of parts can be reduced, and the high-frequency heating device can be manufactured at lower cost.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1A is a front view of a microwave oven which is an embodiment of the high-frequency heating apparatus according to the present invention.
FIG. 2B is a perspective view of the microwave oven shown in FIG. The microwave oven 1 mainly includes the main body 2
, A door 3 and a box-shaped bottom 8. The door 3 is connected to the main body 2 at its lower end, and can be opened by pulling the handle 3a toward the user.

The body 2 is provided with an exterior part 4 for covering the outer shell, a heating chamber 50, and a control panel 6.
It should be noted that the control panel 6 allows the user to operate the microwave oven 1.
Is provided on the front surface of the microwave oven 1 to operate. Further, inside the heating chamber 50, there is provided a turntable 15 for placing an object to be heated such as food. The turntable 15 is configured to be rotatable during heating and cooking by a driving device (not shown).

In the microwave oven 1, the main body 2 and the door 3
Is almost a rectangular parallelepiped, and the box-shaped bottom 8
It is almost rectangular parallelepiped. The box-shaped bottom 8 is provided with a plurality of intake holes 8a on the front surface and the left surface.

The microwave oven 1 includes a magnetron, which is an example of a high-frequency oscillator that emits high-frequency radio waves for heating an object to be heated, on the right side of the heating chamber 50 in the main body 2 and behind the control panel 6. I have. Further, the microwave oven 1 includes a fan for cooling the magnetron and the like. Also, the microwave oven 1 includes a transformer for supplying a high voltage to the magnetron.

FIG. 2 is a schematic diagram for explaining a microwave path in the microwave oven 1 of FIG. FIG. 3 is a front view of a main part of the microwave oven 1 including a fixing member 54 (described later). The microwave oven 1 according to the present embodiment
Has substantially the same structure as that of the conventional microwave oven described with reference to FIG.
The same components as those of the conventional microwave oven shown in FIG.

As shown in FIG. 2, in the microwave oven 1, the microwave emitted from the magnetron 10 is radiated into the heating chamber 50 via the waveguide 56 and the radiation antenna 51. In addition, when the radiation antenna 51 is rotated by the motor 52, the microwave is radiated uniformly to the entire heating chamber 50.

The radiation antenna 51 is connected to a motor 52 via an antenna shaft 53. The antenna axis 53 is
The projection 54a of the fixing member 54 is fixed to the top plate 570 by being fitted into an appropriate position of the top plate 570. The fixing member 54 is made of a heat-resistant and low-dielectric material such as Teflon resin. However, the microwave oven 1 according to the present embodiment has a structure of the fixing member 54 particularly when compared with a conventional microwave oven. Are different.

FIG. 3 shows a vertical section of the fixing member 54. Referring to FIG. 3, in microwave oven 1 of the present embodiment, fixing member 54 is attached to top plate 570 of heating chamber 50.
A shield 540 for shielding the end 571 from the antenna 53 is provided between the end 571 and the antenna shaft 53. The thickness of the top plate 570 is about 0.4 mm. And the shielding part 540 is about 5 m more than the end 571 in order to more reliably shield the end 571 of the top plate 570.
m. This makes it difficult for foreign substances such as solder fragments flowing from other portions to enter between the end portion 571 and the antenna shaft 53. Even if it is mixed, the end portion 571 is moved by the shielding portion 540 to the antenna shaft 53.
Since it is shielded from discharge, no discharge occurs at the place.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

For example, in the present embodiment, the radiation antenna 51 is configured to be rotated by the motor 52, but is not limited to this. The radiation antenna 51 may perform a predetermined reciprocating operation, or may be fixed and do not move.

Although the radiation antenna 51 is provided above the heating chamber 50, the invention is not limited to this. That is, the radiation antenna 51 may be provided on the side inside the heating chamber 50.

Further, the shielding portion 540 is provided in contact with the end portion 571, but is not limited to this. In addition, the shielding portion 540 extends up to about 5 mm above the end portion 571, but is not limited thereto. That is, as long as the shielding portion 540 can shield the end portion 571 from the antenna shaft 571 so that no discharge occurs between the antenna shaft 53 and the end portion 571, the height and the like of the present embodiment are as follows. It is not particularly limited to the form. For example, as in the present embodiment, the top plate 5 having a thickness of about 0.4 mm is used.
In the case where the shielding portion 540 is provided in contact with the end portion 571 of the 70, the height of the shielding portion 540 may be 2 mm or more.

Further, in the present embodiment, the shielding member 540 constitutes a shielding member for shielding the vicinity of the penetrating portion of the antenna shaft on the wall constituting the heating chamber from the antenna shaft.
The shielding portion 540 is integrally formed with the fixing member 54 forming a fixing member for fixing the antenna shaft to the wall surface forming the heating chamber, but the present invention is not limited to this.
That is, for example, when a conventional fixing member is used without changing the design, the shielding member and the fixing member can be configured separately. In the present embodiment, since the shielding section 540 is formed integrally with the fixing member 54, the number of components in the microwave oven 1 can be reduced, so that the manufacturing cost of the microwave oven 1 can be reduced. .

[Brief description of the drawings]

FIG. 1A is a front view of a microwave oven as an embodiment of a high-frequency heating device according to the present invention, and FIG.
It is a perspective view in the state where the door of the microwave oven of (a) was opened.

FIG. 2 is a schematic diagram for explaining a microwave path in the microwave oven of FIG. 1;

FIG. 3 is a front view of a main part of the microwave oven of FIG. 1 including a fixing member.

FIG. 4 is a schematic diagram for explaining connection of an antenna and a motor by an antenna axis in a conventional high-frequency heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microwave oven 10 Magnetron 50 Heating chamber 51 Radiation antenna 53 Antenna shaft 54 Fixing member 56 Waveguide 540 Shielding part

Claims (2)

[Claims] A heating chamber for accommodating an object to be heated; a high-frequency oscillator for emitting high-frequency radio waves for heating the object to be heated; and a high-frequency oscillator for emitting high-frequency radio waves emitted from the high-frequency oscillator to the heating chamber. An antenna, an antenna shaft that penetrates a wall surface forming the heating chamber and supports the antenna, and a shield that shields an end of the wall surface forming the heating chamber near a penetrating portion of the antenna shaft from the antenna shaft. A high-frequency heating device including a member. 2. The apparatus further comprises a fixing member for fixing the antenna shaft to a wall surface forming the heating chamber, wherein the shielding member is integrally formed with the fixing member.
The high-frequency heating device according to claim 1.