JPH02160395A - High frequency heating device - Google Patents

Abstract

PURPOSE:To heat the material to be heated uniformly from the upper, from the side and from the lower and shorten the heating time by providing two feeding openings at the upper and the lower of the side wall of a heating chamber, and feeding the micro wave from the both feeding openings to the heating chamber. CONSTITUTION:The upper feeding opening 5 is provided at the upper of the side wall of a heating chamber 1 and the lower feeding opening 5a is provided at the lower of the side wall of the heating chamber 1, and while a wave guide 4 to which a magnetron 3 is attached is mounted on the outside of the side wall of the heating chamber 1 so as to communicated with the upper and the lower feeding openings 5, 5a. The lower feeding opening 5a is provided under the material to be heated 6 or near a turn table 2, and the upper and the lower feeding openings 5, 5a are provided at the corners of the backward of the heating chamber 1. The micro wave injected from the magnetron 3 is led from the wave guide 4 to the upper and the lower feeding openings 5, 5a, so as to be fed to the heating chamber 1, Thereby, the micro wave is fed from the upper and the lower of the material to be heated, and the material to be heated can be heated uniformly in short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high frequency heating device such as a microwave oven, and more particularly to a high frequency heating device that improves heating unevenness.

[Prior Art] FIG. 5 is a longitudinal cross-sectional view schematically showing an example of a microwave oven using a conventional high-frequency heating device.

In FIG. 5(a), (1) is a heating chamber, and (2) is a turntable provided at the lower part of the heating chamber (1) on which the object to be heated (6) is placed. (3) is a magnetron that generates microwaves, and (4) is a power supply port installed on the ceiling of the heating chamber (1) that is attached to the outer wall of the ceiling of the heating chamber (1), and that transmits the microwaves emitted from the magnetron (3). It is a waveguide that leads to (5).

In the microwave oven configured as described above, when the object to be heated (6) is placed on the turntable (2), the door is closed, and a power switch (not shown) is turned on, the turntable (2) rotates. At the same time, microwaves are emitted from the magnetron (3). This microwave is supplied to the heating chamber from the waveguide (4) through the power supply port (5), and the heated object (6) is
heat up.

FIG. 5(b) shows another conventional technique. In this example, a power supply port (5) is provided above the side wall of the heating chamber (1), and a waveguide (4) attached to the outside of the side wall is connected to the power supply port (5). Microwaves are supplied into the heating chamber (1) through the power supply port (5), and its operation is the same as in the case shown in FIG. 1 (a).

[Problems to be Solved by the Invention] In the conventional high-frequency heating device as described above, a power supply port (5) for supplying microwave power into the heating chamber (1) is provided at one location on the ceiling or side wall. Therefore, the microwaves were not uniformly supplied to the object to be heated (6) as shown by the arrow, and uneven heating often occurred. Furthermore, depending on the location where the object to be heated (6) is placed, it takes time to heat the object, consuming a lot of power.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a high-frequency heating device that can reduce heating unevenness and shorten heating time.

[Means for Solving the Problems] The high-frequency heating device according to the present invention has an upper power supply port provided above the side wall or the ceiling of the heating chamber, and a lower power supply port provided below the side wall or the bottom surface, and uses one magnetron. Microwaves are supplied into the heating chamber from both of these power supply ports.

Further, the lower power supply port is provided below the object to be heated or near the turntable, and the upper and lower power supply ports are provided at the rear corner of the heating chamber.

[Operation] Microwaves emitted from the magnetron are guided from the waveguide to the upper and lower power feed ports, and power is supplied to the heating chamber.

As a result, microwaves are supplied from above and below the object to be heated, and the object to be heated is heated in a short time with little unevenness.

In addition, if the upper and lower power supply ports are installed in the rear corner of the heating chamber,
By placing the object to be heated on the bottom plate in the corner where it will not be interfered with by the turntable, the object can be heated in a shorter time without uneven heating.

[Example of the Invention Figure 1 is an explanatory diagram schematically showing an example of the present invention.
(a) is a plan view, and (b) is a longitudinal cross-sectional view. Note that the same or equivalent parts as those of the conventional example explained in FIG. In the present invention, the heating chamber (1)
An upper power feed port (5) is provided above the side wall of the , and a lower power feed port (5a) is provided below.
It is attached to the outside of the side wall of the heating chamber (1) so as to communicate with the heating chamber (1). In addition, in the example, the lower power feeding port (5
a) is provided below the heated object (6), and the vertical size (height) of the power feed port (5) is
) is 1.5 mrs, and the lower power feed port (5a) is 35 mm.
The lower power feeding port (5a) is configured to be larger than the upper power feeding port (5).

In this embodiment configured as described above, microwaves are supplied into the heating chamber (1) from the upper and lower power supply ports (5) and (5a), so that uneven heating of the object to be heated (6) is prevented. The heating time can be shortened. In addition,
When the lower power supply port (5a) is provided below the object to be heated 6), microwaves are fed from above and below the object to be heated (6), so that the heating time can be further shortened.

FIG. 2 is an explanatory diagram of another embodiment of the present invention.

In this embodiment, an upper power supply port (5) and a lower power supply port (5a) are provided at the corner of the side wall of the heating chamber (1) (at the rear in the embodiment).
In addition, a waveguide (4) equipped with a magnetron (3) is attached to the outer corner of the side wall of the heating chamber (1). According to the present embodiment, the heated object (6) contains a large amount of water, such as sake, milk, etc., placed in a pot, for example.
By placing it directly on the bottom plate in the corner where it will not be interfered with by the turntable (2), the object to be heated (6) can be heated from above and from the sides, reducing uneven heating and shortening the heating time. be able to. In this case, the rotation of the turntable (2) may be stopped as necessary.

In the embodiment shown in FIG. 3, the upper power supply port (5) is provided above the side wall, and the lower power supply port (5a) is connected to the turntable (2).
A waveguide (4) is attached to the waveguide (4). With this configuration, for example, the object to be heated (6) containing a lot of moisture can be placed on the turntable (2) in close proximity to the lower power feed port (5a), and the object to be heated can be heated by stopping the turntable (2). For example, microwaves are supplied to the object to be heated (6) from above and from the sides, and heating can be done in a short time with less uneven heating.

In the embodiment shown in FIG. 4, the upper power supply port (5) is provided above the side wall and at the corner, and the lower power supply port (5a) is provided in the heating chamber (1).
), and a waveguide (4) is attached to it.
By arranging it directly above, microwaves are supplied to the heated object (6) from above and below. Therefore, the object to be heated (6) has very little temperature difference in the vertical direction and is heated in a short time.

In the above description, the upper power supply port is provided above the side wall of the heating chamber, and the lower power supply port is provided below the side wall or on the bottom surface, but the upper power supply port may be provided on the ceiling of the heating chamber.

[Effects of the Invention] As is clear from the above description, the present invention provides power supply ports at two locations above and below the side wall (or ceiling or bottom surface) of the heating chamber, and supplies microwave power to the heating chamber from both power supply ports. As a result, the object to be heated can be heated evenly from above, from the side, or from below, and furthermore, the heating time can be shortened.

[Brief explanation of the drawing]

Figures 1 to 4 are schematic diagrams of embodiments of the present invention, respectively.
(a) is a plan sectional view, and (b) is a longitudinal sectional view. FIGS. 5(a) and 5(b) are vertical cross-sectional views schematically showing conventional high-frequency heating devices, respectively. In the figure, (1) is a heating chamber, (2) is a turntable, (3) is a magnetron, (4) is a waveguide, (5) is an upper power supply port, (5a) is a lower power supply port, and (8) is a It is an object to be heated. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Patent Attorney Muneharu Sasaki Figure 2 (b)

Claims (4)

[Claims] (1) In a device that supplies microwaves emitted from a magnetron to a heating chamber via a waveguide and a power supply port to heat an object to be heated in the heating chamber, the top supply is provided above the side wall or ceiling of the heating chamber. In addition to providing an opening, a lower power feeding port is provided below or on the bottom of the side wall;
A high-frequency heating device characterized in that microwaves are supplied to the heating chamber from both of these power supply ports by a magnetron on the base. (2) The high-frequency heating device according to claim (1), wherein the lower strong electric port is provided below the object to be heated. (3) The high-frequency heating device according to claim (1), wherein the upper power supply port and the lower power supply port are provided at a rear corner of the heating chamber. (4) The high-frequency heating device according to claim (1), wherein the lower power feeding port is provided near the turntable.