JPS62151Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency heating device, and more particularly to a high-frequency heating device that improves the cooling efficiency of a high-voltage transformer for supplying high voltage to a high-frequency oscillator.

As an example of this type of high-frequency heating device, a main body including a high-voltage transformer for supplying high voltage to a high-frequency oscillator is provided with a cooling air passage by a blower, and the cooling air is used to power the high-frequency oscillator and high-voltage transformer. There are known devices that are cooled to prevent these from self-heating and causing excessive temperature rise.

In such a configuration, it is necessary to use the cooling air to cool other electrical components such as the above-mentioned transformer, and considering the passage resistance in the air passage, the ability of the blower is such that it is difficult to use the blower at the specified temperature of the electrical components. Generally, it is necessary to use it near the limit.

In particular, when fire prevention and the like are taken into account, it is desired to improve the cooling performance of transformers among the electrical components.

For this reason, it would be better to increase the capacity of the blower, but
This cannot be implemented because it directly leads to higher costs, and in the end, we had no choice but to use an upgraded transformer with less iron loss and copper loss.

In view of the above-mentioned conventional circumstances, the present invention aims to improve the cooling efficiency of the transformer without increasing the capacity of the blower by simply improving the cooling structure within the heating device main body of the high-voltage transformer. Furthermore, it is an object of the present invention to provide a high frequency heating device in which the transformer can be easily downgraded.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In these figures, 1 is the main body of the high-frequency heating device, 2 and 11 are a heating chamber and a machine room each partitioned by a 1A partition plate in the main body 1, and 3 is a space for putting in and taking out cooked food formed in the heating chamber 2. The opening 4 is a door provided in the opening 3 that can be opened and closed, and has a sealable structure to prevent microwaves from leaking from the opening 3.

5 is a door switch that turns on and off a high-frequency oscillation circuit in conjunction with the opening/closing operation of the door 4; 6 is a controller that controls cooking time, output, cooking start, end, etc.; and 8 is disposed in the machine room 11. 9 is a waveguide, 7 is a microwave power feed port opened in the heating chamber 2, and 10 is a high-voltage transformer for supplying the high voltage necessary for oscillation of the high-frequency oscillator 8, which is located on the inner bottom surface of the machine room 11. It is fixedly supported by 18 fasteners. 21 is a recessed portion formed by recessing the inner bottom wall of the machine room 11; 12 is provided in the recessed portion 21 so as to correspond to the entire bottom circumference of the high voltage transformer 10, which will be described later;
This is an intake hole that communicates with a cooling air passage that will be described later.
The high voltage transformer 10 is constructed as shown in FIG.
The bottom part projects inside the recessed part 21 with a gap G between it and the inner wall surface of the recessed part 21. Reference numeral 13 denotes a blower for supplying cooling air, which is disposed downstream of the intake hole 12 in the machine room 11.
From there, it passes through the machine room 11, passes through the high-frequency oscillator 8, reaches the inside of the heating chamber 2 through the communication hole 1a of the partition plate 1A, and is further configured as a passage toward the outside through the 14 exhaust holes on the side wall of the main body 1. There is.

In this configuration, when a high voltage from the high voltage transformer 10 is applied to the high frequency oscillator 8, the high frequency oscillator 8 emits microwaves, and the microwaves are heated from the microwave power supply port 7 via the waveguide 9. The 15 food items placed in the chamber 2 are irradiated with heat and cooking begins.

During such cooking, the high-voltage transformer 10, high-frequency oscillator 8, etc. generate heat by themselves, but are cooled by the cooling air guided from the intake hole 12 to the cooling air passage by the operation of the blower 13.

In this case, according to the above configuration, air sucked in from the intake hole 12 by the operation of the blower 13 enters the recess 21, passes through the gap G, and enters the machine room 11.
Air is blown inside.

That is, since the cooling air is collected and passes through the gap G between the outer periphery of the transformer 10 and the inner wall surface of the recess 21, it can contact the core surface 19, winding 20, etc. of the transformer 10 more efficiently than in the past. These are then cooled down. In particular, the intake hole 12 of the recessed part 21
are provided along the entire outer circumference of the transformer 10, so that they contact the entire circumference of the transformer 10 more efficiently, resulting in higher cooling performance. Therefore, if the cooling efficiency of the transformer 10 can be increased as described above, it is possible to downgrade the transformer 10 by reducing the winding length or reducing the core material.
Note that the recessed portion 21 does not have to be integrally molded with the main body 1, but may be formed as a separate member and attached to the bottom wall of the main body 1.

In this case, the separate component of the recess is preferably made of an electrically insulating material such as synthetic resin.

The high-frequency heating device according to the present invention improves the cooling efficiency of the high-voltage transformer without improving the blowing function through a simple improvement that allows cooling air to efficiently contact and pass around the high-voltage transformer for supplying high pressure to the high-frequency oscillator. This has the advantage of being able to improve the performance of the high voltage transformer, thereby downgrading the high voltage transformer and offering it to the market as an inexpensive product.

[Brief explanation of the drawing]

FIG. 1 is a top view showing the structure of a high-frequency heating device according to the present invention, and FIG. 2 is a side sectional view of the same device. 1...High frequency heating device main body, 8...High frequency oscillator, 10...High voltage transformer, 12...Intake hole, 1
3...Blower, 21...Recess, G...Gap.

Claims (1)

[Claims for Utility Model Registration] (1) In a high-frequency heating device that has a main body equipped with a high-voltage transformer for supplying high voltage to a high-frequency oscillator and has a passage for cooling air by a blower, a recessed portion is provided in the inner wall of the main body. At the same time, a part of the high-voltage transformer is inserted into the inside of the recess with a gap between the inner wall surface of the recess and a part of the high-voltage transformer that is provided in the recess so as to correspond to the entire circumference of the part of the high-voltage transformer. A high-frequency heating device characterized by forming an intake hole that communicates with the. (2) The high-frequency heating device according to claim 1, wherein the recessed portion is constituted by a separate member made of an electrically insulating material such as synthetic resin.