JP2643498B2 - High frequency heating equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power supply system for a high-frequency heating device.

2. Description of the Related Art Conventionally, in a high-frequency heating apparatus in which power is supplied from two power supply ports from the same wall, as shown in FIG.
A power supply port 2 is provided on the upper surface 1 of the heating chamber, and a rotating stirrer blade 3 is used as a means of a radio wave ring, or a heated object 8 is rotated by a turntable 9 as shown in FIG. The uniformity of heating was ensured.

Problems to be Solved by the Invention However, if it is attempted to stir the radio waves using the rotary stirrer blades 3, the radio waves emitted from the power supply port 2 to the inside of the chamber 7 are relatively large in principle. If it is not the stirrer blade 3, the stirring effect cannot be obtained. Therefore, a large space is required for the stirrer blades 3, and the effective cooking area in the refrigerator is reduced.

Further, if the object to be heated 8 is placed at a position close to the power supply port 2 due to the principle of stirring the radio waves emitted from the power supply port 2 to the inside 7 as described above, the radio waves emitted from the power supply port 2 , A problem arises in that the vicinity of the power supply port is excessively heated. This is the same as for an object to be heated having a height when power is supplied from the power supply port 2 on the upper wall surface of the heating chamber by the above method. It turns out that there is. However, it is actually very difficult to adopt such a configuration because the external dimensions become large.

Further, in the method of using the turntable 9 and rotating the heated object 8 to ensure uniformity of heating, the width and the depth of the heating chamber 7 need to be approximately the same size because the turntable 9 rotates. It is particularly disadvantageous when heating an object to be heated having a small width and a long length, and is subject to dimensional restrictions in designing a high-frequency heating device. Furthermore, even if the object 8 to be heated is large enough to enter the heating chamber 7, if it protrudes from the turntable 9, it cannot hit the wall surface and cannot be rotated, so that the area in which the object 8 can be actually inserted is reduced.

In addition, as shown in FIG.
In the case where power is supplied using the antenna 10, when the opening of the rotary waveguide antenna 10 is oriented in the direction of a in the drawing and when it is oriented in the direction of b, in terms of high-frequency circuits, The impedance is extremely different, and the excavation efficiency of the magnetron 5 is deteriorated, so that not only a rated high-frequency output cannot be obtained, but also the durability of the magnetron 5 deteriorates.

Furthermore, when the openings of the rotating waveguide antenna 10 face each other, the other party's microwave directly enters from the power supply port, causing an antenna spark or abnormal heat generation in the other magnetron, which is dangerous.

The microwave radiated from the rotating waveguide antenna 10 has directivity, and as shown in FIG.
Is heated by the microwave reflected on the side wall surface 11 of the heating chamber, so that the corner where the object 8 is not placed is generally strong, the heating efficiency is low, and the surroundings of the object 8 Despite being strongly heated, there is a problem in cooking performance that the bottom center is in a late heating state.

Accordingly, an object of the present invention is to provide a high-reliability high-frequency heating device that minimizes the space required for power supply and radio wave stirring in a heating chamber, has a large effective heating area, has good radio wave distribution performance, and has a high reliability. I do.

Means for Solving the Problems In order to solve the above problems, the high-frequency heating device of the present invention is provided with one power supply port in each of two circular apertures which are close to the center of the wall surface and exist independently, Power is supplied from the feed port using a rotary waveguide antenna by coaxial coupling, and the center of the feed port is provided closer to the center of the wall than the center of the circular stop, so that the opening end face of the rotary waveguide antenna and the circular stop are provided. The distance from the slanted wall is narrowed toward the center of the wall.

Function The high-frequency heating device of the present invention is provided with a feed port in each of two circular apertures which are close to the center of the wall surface and independently exist, and a rotary waveguide antenna is used from the feed port. By feeding power by coaxial coupling, when the openings of the rotating waveguide antenna face each other, the inclined wall surface of the diaphragm exists in the middle, so that the other party's microwave does not directly reach the other magnetron, There is no danger of causing antenna sparks or abnormal heating.

Furthermore, since there is a circular stop at a relatively equal distance around the opening of the rotating waveguide antenna, the impedance after the opening becomes uniform from the viewpoint of the high-frequency circuit, and the oscillation efficiency of the magnetron is improved. At the same time, stable oscillation is obtained, which contributes to the improvement of the magnetron life.

In addition, the directional microwave radiated from the rotating waveguide antenna can change its traveling direction on the inclined wall surface of the circular aperture around it, and directly heat the object to be heated, so heating efficiency is improved. In addition to the above, each of the inclined walls of the circular diaphragm exists near the center of the wall, so that microwaves twice as large as the other parts warm the object to be heated, and it is possible to strongly heat the center of the bottom, which is usually difficult to heat. It is possible to improve the difference in heating from the surroundings.

In addition, by providing the center of the supply port closer to the center of the wall than the center of the circular stop, the distance between the opening end surface of the rotating waveguide antenna and the inclined wall surface of the circular stop can be reduced.
By configuring so as to become narrower near the center of the wall surface, the electric field intensity in the opening becomes stronger than in other portions, and the object to be heated can be heated more strongly in the center.

As described above, by solving the problem when power is supplied using the rotating waveguide antenna, the rotating waveguide antenna can be used for power supply and radio wave agitation, and the stirrer can be used. Various problems when radio wave agitation is performed using a blade or a turntable are solved.

In other words, by using the rotating waveguide antenna for feeding and stirring the microwaves to the heating chamber, a sufficient radio wave stirring effect can be obtained with a relatively small area, and the effective cooking area in the refrigerator However, it can be secured greatly.

Further, since the rotating waveguide antenna is formed so as to cover the power supply port, there is no problem that the object to be heated near the power supply port is excessively heated by directly receiving the radio wave emitted from the power supply port. .

In addition, since the object to be heated is not rotated, even if the object to be heated is completely filled in the heating chamber, uniform heating can be realized,
The width and depth of the heating chamber can be freely designed.

Example Hereinafter, a high-frequency heating device according to an example of the present invention will be described with reference to the drawings.

As shown in FIG. 1, two independent circular diaphragms are formed on the bottom surface of the heating chamber 7 substantially at the center in the depth direction and close to the center of the bottom surface. Inside the circular aperture,
Two power supply ports 2 are provided on the line xx 'connecting the center points of the circular apertures and closer to the center of the bottom surface than the center point of the circular aperture 12. Tube antenna
At 10, power is supplied to the heating chamber 7 by coaxial coupling.

In addition, as shown in FIG.
Are sufficiently buried in the circular apertures, and even if the apertures of both rotating waveguide antennas 10 face each other, the microwave radiated from the rotating waveguide antenna 10 is in the center. Is blocked by the inclined wall 13 of the circular diaphragm in
There is no danger of causing an antenna spark or abnormal heat generation without directly reaching the other magnetron 5.

Furthermore, since the inclined wall surface 13 of the circular stop is present at a relatively uniform distance around the opening of the rotating waveguide antenna 10, the impedance after the opening becomes relatively uniform from the viewpoint of a high-frequency circuit, and the magnetron 5 Oscillation efficiency is improved, and stable oscillation is obtained, which contributes to improving the life of the magnetron 5.

In addition, the directional microwave radiated from the rotating waveguide antenna 10 is applied to the inclined wall 13
Since the direction of travel can be changed and the object to be heated 8 is directly heated, heating efficiency is high, and the inclined wall surfaces 13 of both the right and left circular apertures are present near the center of the bottom surface. The doubled microwave heats the object 8 to be heated, and can strongly heat the center of the bottom surface, which is usually hard to be heated, and can improve the difference in heating from the surroundings.

Further, by providing the center of the power supply port 2 closer to the center of the wall than the center of the circular stop, the distance between the opening end surface of the rotary waveguide antenna 10 and the inclined wall 13 of the circular stop is reduced. By configuring so as to be narrower nearer, the electric field intensity in the opening becomes stronger near the center of the wall surface than in other portions, and the object 8 to be heated can be heated more strongly in the center.

In addition, by using the rotating waveguide antenna 10 for microwave power supply and stirring to the heating chamber 7, a sufficient radio wave stirring effect can be obtained with a relatively small area, and effective A large cooking area can be secured.

Further, since the rotary waveguide antenna 10 is formed so as to cover the power supply port 2, the object to be heated 8 near the power supply port is excessively heated by directly receiving the radio wave emitted from the power supply port 2. There is no problem.

Further, since the object to be heated 8 is not rotated, even if the object to be heated 8 is completely filled in the heating chamber, uniform heating can be realized, and the width and depth of the heating chamber 7 can be designed for any reason.

In particular, the power supply configuration is effective in the rectangular heating chamber 7 as in this embodiment.

It is desirable that the rotation speeds of the respective rotating waveguide antennas are different from each other.

Effect of the Invention As described above, the high-frequency heating device of the present invention is provided with one power supply port in each of the two circular apertures that are close to the center of the wall and that are independently provided, and are rotated from the power supply port. When the apertures of the rotating waveguide antenna face each other by feeding power by coaxial coupling using a waveguide antenna, the microwave of the other party is transmitted to the other magnetron because the inclined wall surface of the diaphragm exists in the middle between them. It does not reach directly and there is no danger of causing antenna sparks or abnormal heating.

In addition, since a circular stop is present around the opening of the rotating waveguide antenna at a relatively uniform distance, the impedance after the opening becomes relatively uniform from the viewpoint of a high-frequency circuit, and the oscillation efficiency of the magnetron is improved. As a result, stable oscillation is obtained, which contributes to the improvement of the life of the magnetron.

In addition, the directional microwave radiated from the rotating waveguide antenna can change its traveling direction on the inclined wall surface of the circular aperture around it, and directly heats the object to be heated. In addition to the above, there are inclined wall surfaces of both left and right circular apertures close to the center of the bottom, so microwaves twice as large as the other parts warm the object to be heated, and it is possible to strongly heat the center of the bottom that is usually difficult to heat. It is possible to improve the difference in heating from the surroundings.

Furthermore, by providing the center of the power supply port closer to the center of the wall than the center of the circular stop, the distance between the opening end face of the rotating waveguide antenna and the inclined surface of the circular stop is narrowed toward the center of the wall. With such a configuration, the electric field intensity in the opening becomes stronger than in the other portions, and the object to be heated can be heated more strongly in the central portion.

The present invention has the same effect not only in the power supply method from the two locations on the bottom surface of the heating chamber, but also in the power supply method from the two locations on the upper surface of the heating chamber and the power supply method from a total of four locations on the upper surface and the bottom surface. .

[Brief description of the drawings]

FIG. 1 is a top view of a high-frequency heating device in an embodiment of the present invention, FIG. 2 is a side sectional view of the heating device, and FIGS.
The figure is a side sectional view of a conventional high-frequency heating device, FIG. 5 is a top view of the device, and FIG. 6 is a side sectional view of the device. 2 ... opening, 5 ... magnetron, 6 ... waveguide, 7
…… Heating room, 10… Rotating waveguide antenna, 12 …… Circular aperture.

Claims (2)

(57) [Claims] 1. A power supply port, a magnetron for oscillating microwaves, and a waveguide for guiding microwaves oscillated by the magnetron to the power supply port, on the same wall surface on the upper surface and / or the bottom surface of the heating chamber. And a rotary waveguide antenna for supplying power to the heating chamber by coaxial coupling from the power supply port, wherein the two power supply ports are close to the center of the wall surface and have two independent circular apertures. A high-frequency heating device, wherein one is provided in each of the high-frequency heating devices. 2. The distance between the opening end face of the rotary waveguide antenna and the inclined wall of the circular stop is narrowed toward the center of the wall by moving the center of the feed port closer to the center of the wall than the center of the circular stop. The high-frequency heating device according to claim 1, wherein: