JPH02181387A - Microwave oven - Google Patents

Abstract

PURPOSE:To improve the cooking capacity by providing four magnetrons whose oscillations and oscillation releases can be controlled individually, and two waveguides to focus microwaves generated by two magnetrons into one respectively. CONSTITUTION:By the upper waveguide 2 and the lower waveguide 3, the high-frequency outputs of two magnetrons 5 at the upper side and two magnetrons magnetrons 5 at the lower side are focused into one respectively, and fed to a heating chamber 4 in a coaxial combination from about the centers of the upper wall surface 6 and the lower wall surface 7 of the heating chamber 4. The four magnetrons 5 are connected respectively to a power source which has a changeover switch to the primary or the secondary side of a high voltage transformer, and the turning ON and OFF can be controlled individually. Consequently, not only the cooking capacity in the conditions 'medium' and 'thawing' can be improved, but also the cost can be reduced extensively by using four low cost magnetrons.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-power high-frequency heating device having four magnetrons that can be individually controlled to oscillate or non-oscillate.

Conventional technology Conventionally, in a high-frequency heating device with a high-frequency output of 1.6 KW to 2 KW, two expensive and relatively special magnetrons 1 capable of obtaining a high-frequency output of IKW are used as shown in Figs. 4 and 5. It was used to supply electricity.

Problems to be Solved by the Invention However, as mentioned above, the high frequency output of IKW can be obtained.
The magnetron 1 is a relatively special and expensive item that is used only in high-frequency heating devices that require high output for commercial use.

Furthermore, conventionally, for high frequency output, "strong" is 2KW with double-sided oscillation, and "medium" is 32KW, for example, as shown in Figure 6(a).
It outputs IKW by alternating oscillation on each side with a period of seconds. In addition, in relation to cooking performance, ``defrosting'' is a low output power on average over time, regardless of the magnitude of the ``strong'' output, as shown in Figure 6 (bl).
NJ, 55 seconds later, the other side is rONJ L for 9 seconds,
After another 55 seconds, the opposite side is turned on again, and so on, and the upper and lower sides are turned on and off at regular intervals. however,
During "medium" and "defrosting", only one side of the upper and lower tubes oscillates, and the time gap between them is such that the magnetron,
Due to the intermittent durability of the relay, the length (as it is set,
In high-frequency heating devices designed to uniformly heat food, when the upper and lower tubes oscillate simultaneously, the uniformity of heating is significantly reduced. Furthermore, during ``thawing'', it is extremely undesirable to apply IKW even though the average output is lowered in intermittent operation to thaw frozen items without causing them to boil.

The present invention solves the above-mentioned problems.
The purpose is to provide a high-performance high-frequency heating device with improved cooking performance at a low cost during "defrosting".

Means for Solving the Problems In order to achieve the above object, the high frequency heating device of the present invention uses four magnetrons for general household use, each magnetron can be individually controlled to oscillate and non-oscillate, and each The microwaves generated by the main magnetron are converged into one by a waveguide, and then power is supplied to the heating chamber from approximately the center of the upper and lower walls of the heating chamber through coaxial coupling. .

Operation The present invention has the above-described configuration, and by individually controlling the oscillations of the four magnetrons, it is possible to "decompress" by intermittent high-frequency output of one-fourth of the maximum output, or to reduce the high-frequency output to one-half of the maximum output. It is possible to obtain a "middle" that can radiate continuously from above and below. What's more, after converging the outputs of two magnetrons into one using a waveguide, power is supplied through coaxial coupling from approximately the center of the upper and lower walls, making it possible to switch the output into two stages. It can be handled as if it were a two-tube type. This improves the cooking performance during "medium" and "defrost" times, and by using four inexpensive magnetrons, it is possible to significantly reduce costs.

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 FIGS. 1 and 2, the high-frequency outputs of the two upper and lower magnetrons 5 are converged into one by the main wave tube 2 and the lower wave tube 3, and the upper wall surface 6 of the heating chamber 4 and Power is supplied to the heating chamber 4 from approximately the center of the lower wall surface 7 through coaxial coupling. 4
Each of the magnetrons 5 is connected to a power source having an on/off switch on the primary or secondary side of a high-voltage transformer, so that each magnetron 5 can be individually controlled. Now, assuming that the high frequency output of each magnetron 5 is 500 W, when all four magnetrons are oscillated, a high frequency output of 2 KW can be obtained. Compared to obtaining 2KW using two IKW output magnetrons, by using four magnetrons that cost approximately 1/4 of the cost, 2KW can be obtained at approximately 1/2 the cost.
can be obtained.

Furthermore, the on/off of the four magnetrons 5 can be controlled individually, and the output of each magnetron is 500W, so when the output is "medium", if the upper and lower magnetrons are oscillated one by one as shown in Figure 3 fat, the total IKW output can be obtained by applying the upper and lower outputs simultaneously, which not only allows more uniform and efficient heating than applying the IKW output alternately to the upper and lower sides, but also prevents deterioration due to disconnection of the magnetron and relay. Note that it is desirable that the opposite magnetron oscillates the next time the "middle" output is selected. Also, during ``defrosting'', by performing alternating intermittent operation of 500W up and down, it is possible to apply lower output in small increments than when IKW on one side, as shown in Figure 3 (b), even under small loads. Allows for uniform thawing without boiling.

In addition, since there are four circuits with high frequency output of 500W, I
Compared to two KW circuits, the current flowing per circuit is 1/2, so the current capacity of the switches, relays, etc. that control it is also 1/2, and commonly available products can be used. Even if twice as many electrical parts as in IKW are used, the mass production effect reduces the total cost by half or less. It has the following effects.

Effects of the Invention As described above, the high frequency heating device of the present invention achieves IK by using four magnetrons commonly used for household use.
It can be configured at about 1/2 the cost compared to using two magnetrons with W output. Furthermore, the microwaves generated by two magnetrons, each of which can control oscillation and non-oscillation individually, are converged into one by a waveguide, and then coaxially coupled from approximately the center of the upper and lower walls of the heating chamber. By configuring the heating chamber to be supplied with electricity, it is possible to eliminate the directionality of the microwaves generated by the two magnetrons.
Although it is powered by four magnetrons, it can be handled as if it were powered by two upper and lower magnetrons whose output can be switched in two stages. Therefore, when outputting "middle", one of the two upper and lower
It can oscillate continuously, and compared to conventional methods where high-frequency output is applied alternately to the upper and lower sides when the output is set to "strong", uniform and efficient heating can be achieved. This is better than heating one at a time. Furthermore, since there is no need for intermittent operation, deterioration due to intermittent operation of the magnetron or relay is not caused.

Furthermore, when outputting "defrosting", a low output of 1/4 of the "strong" output can be applied in small steps, making it possible to perform uniform defrosting without overcooking even under a small load.

Furthermore, by configuring the power supply with four circuits so that the four magnetrons can individually control oscillation and non-oscillation,
The current flowing through one circuit is only 1/4 of the total, and the current capacity of switches, relays, etc. is also small, and common, low-cost components can be used.

As described above, the present invention provides a high-performance, highly reliable high-frequency heating device that improves cooking performance especially when outputting "medium" and "defrost" outputs, and is less prone to deterioration due to interruptions in each electrical component. It is very useful to provide at low cost.

[Brief explanation of the drawing]

FIG. 1 is a rear configuration diagram of a high-frequency heating device according to an embodiment of the present invention, FIG. 2 is a top configuration diagram of the same, and FIG.
Figure 3 is a timing chart showing the operation of each magnetron when the output is "medium" (bl is the timing chart when the output is "defrost"), Figure 4 is a rear view of the conventional high-frequency heating device, and Figure 5 is the top view of the same. Configuration diagram, Fig. 6+a) is a timing chart at the time of "medium" output, and FIG. 6 (bl is a timing chart at the time of "decompression" output). 2... Upper waveguide, 3 ... lower waveguide, 4 ... heating chamber, 5 ... magnetron, 6 ... soil wall surface, 7 ... lower wall surface Name of agent: Patent attorney Shigetaka Awano, 1 person p--F-
Side (pipe manufacturing 3-F example 5 Summer pipe C-・L small surface Fig. 2 Fig. So

Claims (1)

[Claims] It has four magnetrons that can individually control oscillation and non-oscillation, and a waveguide that converges the microwaves generated by each of the two magnetrons into one, and heats the converged microwaves. A high-frequency heating device configured to supply power to the heating chamber from approximately the center of the upper and lower walls of the chamber through coaxial coupling.