JPH0665153B2 - High frequency heating device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a high-frequency heating device having a plurality of high-frequency generators.

Conventional technology In a high-frequency heating device generally known as a so-called microwave oven, as one means for uniformly heating food,
For example, a high-frequency power supply port to the heating chamber is provided in each of the upper and lower heating chamber walls forming the heating chamber to heat the object to be heated from above and below.

An example of this conventional method will be described with reference to the drawings. FIG. 5 is a partially cutaway perspective view of a main part of a conventional high frequency heating apparatus, and FIG. 6 is a top cutaway plan view of the same high frequency heating apparatus. In FIGS. 5 and 6, reference numeral 1 denotes a high-frequency heating apparatus main body, and a central lead of a heating-chamber upper wall 3 and a heating-chamber bottom wall 4 constituting a heating chamber 2 provided inside the high-frequency heating apparatus main body 1. Power supply ports 5 and 6 to the inside of the heating chamber 2 for high-frequency power are provided opposite to each other on the vertical line,
These power supply ports 5 and 6 are waveguides 7 and 8 whose tube axis directions differ by 90 degrees.
Are coupled to the high frequency generators 9 and 10 provided outside the heating chamber 2 in terms of high frequency. Here, when the tube axes of the waveguides 7 and 8 guided to the power feed ports 5 and 6 are made to coincide with each other, the high frequency waves emitted from the respective power feed ports 5 and 6 are the other power feed ports 5 and 6.
Is excited at a high frequency to cause adverse effects such as heating the high frequency generators 9 and 10 through the waveguides 7 and 8 on the opposite side, so that the tube axis directions of the waveguides 7 and 8 are set to 90 degrees, which is the least affected. Crossed. Further, blower motors 13 and 14 are provided outside the rear side wall 11 and outside the right side wall 12, respectively, of the heating chamber 2 in which the high frequency generators 9 and 10 are provided for cooling the high frequency generators 9 and 10, respectively. Has been. Heated object 15
High frequency is applied to the upper and lower surfaces from the power supply ports 5 and 6 and is heated.

However, according to the conventional high-frequency heating device of this type, the waveguide axes of the waveguides 7 and 8 are configured to intersect at 90 degrees,
Since the high-frequency generators 9 and 10 and the blower motors 13 and 14 are arranged corresponding to the waveguides 7 and 8, the entire apparatus becomes very large with respect to the heating chamber 2, which is a space saving particularly required in recent years. There was a problem that I could not deal with the problem.

The present invention solves the above problems, and an object of the present invention is to provide a high-frequency heating device that addresses the problem of space saving.

Means for Solving the Problems In order to solve the above problems, the present invention relates to two high-frequency generators provided outside one surface of a heating chamber side wall forming a heating chamber in a high-frequency heating device body. A high-frequency power supply port provided on each of the heating chamber upper wall and the heating chamber bottom wall on the central vertical line of the heating chamber, and high-frequency power generated by the two high-frequency generators. Two waveguides that are guided to the power supply port and have different tube axis directions at the power supply port portion and a metallic cover plate that avoids direct high-frequency radiation to the power supply port are provided. .

Operation With the above configuration, the high frequencies generated by the two high frequency generators are guided by the waveguide, one to the upper wall side of the heating chamber and the other to the lower wall side of the heating chamber. The heating chamber is bent in the direction along the direction, and is directed from a different tube axis direction to a power feeding port provided at a central portion of each wall surface, that is, a portion on the vertical line at the center of the heating chamber, and the heating chamber is excited by a high frequency by the power feeding port. At this time, the traveling direction of the high-frequency electric field is prevented from directly going to the other power feeding port by the metallic cover.

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

FIG. 1 is a side sectional view of a high frequency heating apparatus showing an embodiment of the present invention, and FIG. 2 is a perspective view of a main part of the high frequency heating apparatus. Here, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. In Fig. 1, 21 and 22 are diameters
It is a 25 mm circular power supply port, and the high frequency heating device body 1
Upper wall 3 of the heating chamber constituting the heating chamber 2 provided inside the
And it is provided in the portion on the central vertical line of the bottom wall 4 of the heating chamber. Further, on the outer side of the rear wall 11 of the heating chamber, high-frequency generators 9 and 10 are provided side by side at substantially the same height as shown in FIG. In addition, a power supply port provided on the upper wall 3
21 and the high frequency generator 9 are connected by a waveguide 23, and the power supply port 22 provided on the bottom wall 4 and the high frequency generator 10 are connected by a waveguide 24. As described above, since the upper and lower power supply ports 21 and 22 are on the central vertical line (center of the heating chamber), and the high frequency generators 9 and 10 are arranged in parallel outside the rear side wall 11, The tubes 23 and 24 have a structure in which the tube axis direction is bent on the way, and the angle α formed by the tube axes of the respective waveguides 23 and 24 at the coupling portion with the feed ports 21 and 22 is shown in FIG. The bending positions are set so that they are almost at right angles.

In addition, metallic antennas 25 and 26 having a diameter of 15 mm for performing high-frequency electric field coupling between the waveguides 23 and 24 and the heating chamber 2 are provided at the power supply ports 21 and 22, respectively, and output shafts of the dielectrics of the drive motors 27 and 28. Is rotatably supported vertically. Antenna 25, 26
Receives a high frequency electric field inside the waveguides 23 and 24, and generates a high frequency electric field between the tip ends 29 and 30 of the antenna and the wall of the heating chamber 2 to excite the high frequency inside the heating chamber 2. Metallic cover plates 31 and 32 each having a fan-shaped flat surface are fixed to the antenna tips 29 and 30 at right angles to the rotation axis. The cover plates 31 and 32 have the antennas 25 and 26 as axes, respectively. While rotating while using the high-frequency heating device, it operates as an electric field stirring blade, and in order to prevent high frequencies from going straight from one power supply port 21, 22 to the other, power supply from each power supply port 21, 22 to the other Avoid direct radiation to the mouth. Below this cover plate 31, a dielectric partition plate 33 is provided,
The object to be heated 15 and the user are prevented from touching the cover plate 31, and the object-to-be-heated object mounting table 34 of a dielectric is provided above the cover plate 32 to secure a rotation range of the cover plate 32.

One blower motor 35 is used to cool the high frequency generators 9 and 10.
The cooling air generated by the two fans 36, 37 connected to the output shaft of the above is blown through the guides 38, 39. Two power supply transformers 42, 43 for supplying electric power required for the operation of the respective high frequency generators 9, 10 are arranged in the vicinity of the intake ports 40, 41 of the fans 36, 37. The structure is such that the flow of the cooling air sucked in further passes through the surfaces of the power transformers 42 and 43. The arrows in FIGS. 3 and 4 indicate the flow of wind.

In this way, the waveguides 23 and 24 are configured such that the tube axis directions are substantially orthogonal to each other at the power supply ports 21 and 22, and the high frequency generators 9 and 10 are collectively provided outside the heating chamber rear side wall 11. As a result, the width of the high-frequency heating device main body 1 is, for example, 430 mm (width) × 560 mm (depth) × 360 mm (height) for the conventional external dimensions of 520 mm (width) × 560 mm (depth) × 360 mm (height). )
The width can be reduced by 90 mm. Also,
By providing the power supply ports 21 and 22 with the cover plates 31 and 32, it is possible to greatly reduce the heating phenomenon to the other high-frequency generators 9 and 10, and to reduce the uneven heating due to the high-frequency stirring effect. You can Furthermore, the high frequency generators 9 and 10
Since all heavy components such as the power transformers 42 and 43 and the blower motor 35 for cooling are concentrated on the outer side of the rear side wall 11 of the same heating chamber, the center of gravity of the high frequency heating device body 1 is also located in that part. The installation state becomes stable, and the object to be heated 15 moves due to the wobbling of the main body 11 of the high-frequency heating device when the door 44 of the high-frequency heating device is opened and closed,
For example, it is possible to eliminate the problem that the liquid heated object 15 spills out of the container. In addition, when a shelf is installed on the wall as the installation location of the high frequency heating device and the shelf is installed on the shelf, a partial stress closer to the wall is applied to the shelf than in the conventional case, so that a simple configuration can be achieved. Construction can be done easily.

In this embodiment, the fins 36, 37 connected to both sides of the output shaft of the blower motor 35 are connected to the high frequency generator 9,
Although the cooling means 10 is used, it is also possible to use one fan, divide the cooling air into two at the outlet of the fan, and bring the cooling air into contact with the respective high-frequency generators 9 and 10. Good. Further, although the two cover plates 31 and 32 which rotate about the antennas 25 and 26 as the axes during use of the high frequency heating device are provided, only one of the antennas may have the cover. Further, in this embodiment, the high frequency generators 9 and 10 are arranged outside the heating chamber rear side wall 11, but the high frequency generators 9 and 10 are arranged outside either the left side wall or the right side wall of the heating chamber. You may arrange.

As described above, according to the present invention, the tube axis direction of the waveguide at the power feed port portion is shifted, and the high frequency generators are concentrated on the outside of one surface of the heating chamber side wall. If the reduction in heating is reduced by the other high frequency generator, the depth of the main body can be reduced by the width dimension of either one by the high frequency generator and its cooling blower motor, and installation space is especially important. As a so-called commercial high-frequency heating device installed in customer rooms of hotels and restaurants, counters such as convenience stores, the effect of saving space is great. Furthermore, by shifting the tube axis direction of the waveguide at the power feed port, a metal cover plate is provided on at least one power feed port using the straightness of high frequency, and one power feed port directly goes to the other power feed port. Due to the structure that cannot radiate, the high frequency wave that goes from the power feed port to the heating chamber is reflected by the cover plate, and cannot directly go to the object to be heated or go to another power feed port. It is possible to drastically reduce the heating phenomenon to the above, increase its durability function, and improve the heating unevenness performance by the high frequency stirring effect.

[Brief description of drawings]

FIG. 1 is a side sectional view of a high-frequency heating apparatus showing an embodiment of the present invention, FIG. 2 is a perspective view of a main part of the high-frequency heating apparatus, and FIG.
FIG. 4 is a partially cutaway plan sectional view of the same high-frequency heating apparatus, FIG. 4 is a rear sectional view of the same high-frequency heating apparatus, and FIG. 5 is a partially cutaway perspective view of a main part of a conventional high-frequency heating apparatus. The figure is an upper cutaway plan view of the same high-frequency heating device. DESCRIPTION OF SYMBOLS 1 ... Main body of high frequency heating device, 2 ... Heating chamber, 9, 10 ... High frequency generating device, 21, 22 ... Power supply port, 23, 24 ... Waveguide, 31, 32 ... Cover plate, 35 ... Blower motor.

Claims (2)

[Claims] 1. A high frequency generator provided outside one surface of a side wall of a heating chamber constituting a heating chamber in a main body of the high frequency heating device, and an upper wall and a heating chamber constituting the heating chamber. High-frequency power supply ports respectively provided on the central vertical line of the bottom wall and high-frequency power generated by the two high-frequency generators are guided to the respective power supply ports, and a pipe at this power supply port part A high-frequency heating device provided with two waveguides having different axial directions and a metallic cover plate for avoiding direct high-frequency radiation to the power supply port. 2. The high-frequency heating device according to claim 1, wherein the two high-frequency generators are cooled by one blower motor.