JPS62152Y2 - - 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. It is known to cool these to prevent them from self-heating and causing an excessive rise in temperature.

In such a configuration, it is necessary to use the cooling air to cool and equalize other electrical components such as the transformer.
Furthermore, considering the passage resistance in the air passage, etc., the ability of the air blower generally requires that the air blower be used near the limit of the standard temperature of the electrical components.

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 possible to increase the capacity of the blower, but this cannot be done because it directly leads to higher costs.In the end, we have no choice but to use an upgraded transformer with less iron loss and copper loss. I didn't get it.

In view of the above-mentioned conventional circumstances, the present invention aims to improve the cooling performance of the transformer without increasing the capacity of the blower by simply improving the cooling structure within the heating device body of the high-voltage transformer. Furthermore, it is an object of the present invention to provide a high-frequency heating device that facilitates downgrading of the transformer.

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

In Fig. 1, 1 is the main body of the high-frequency heating device, 2
and 11 are respectively a heating chamber and a machine room partitioned by 1A partition plates in the main body 1, 3 is an opening formed in the heating chamber 2 for taking in and taking out cooked food, and 4 is a freely openable/closeable opening provided in the opening 3. The door 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;
8 is a high-frequency oscillator disposed in the machine room 11; 9 is a waveguide; 7 is a microwave power supply opened in the heating chamber 2; The opening 10 is a high voltage transformer for supplying the high voltage necessary for oscillation of the high frequency oscillator 8, and is fixedly supported on the inner bottom surface of the machine room 11 by 18 fasteners. Reference numeral 12 indicates a large number of intake holes provided near the high-voltage transformer 10 on the inner bottom wall of the machine room 11, and reference numeral 13 indicates the intake holes 12 in the machine room 11.
A blower for supplying cooling air installed on the downstream side.
The passage of the cooling air is from the intake hole 12, through the machine room 11, through the high frequency oscillator 8, and through the partition plate 1.
It is configured as a passageway that reaches the inside of the heating chamber 2 through the communication hole 1a of A, and further goes to the outside through 14 exhaust holes on the side wall of the main body 1.

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 feed 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 and the high-frequency oscillator 8 self-generate heat, but are cooled by the cooling air sucked in from the intake hole 12 by the operation of the blower 13.

Further, in the present invention, as shown in FIG. 2, a blow guide cover 16 is provided on the high voltage transformer 10.

That is, in this figure, 19 and 20 are the core surface and windings of the transformer 10, 17 is a lead wire, and 16 is
is a box-shaped ventilation guide cover with an open bottom.
6A is an opening slightly larger than this formed along the outer circumferential shape of the transformer 10, and 16B is an opening 16
This is a positioning pawl formed to protrude inward from the A edge.

As shown in the figure, such a cover 16 covers the transformer 1.
0 It is dropped from above and its internal space is the intake hole 1
The entire lower part of the transformer 10 is covered so as to communicate with the transformer 10, and the head of the transformer 10 is connected to the opening 16A.
protrude from At this time, a gap G is formed between the outer periphery of the transformer 10 and the opening 16A. Also, by pulling out the lead wire 17 from the opening 16A,
This lead wire 17 prevents the cover 16 from coming off.

Incidentally, since the cover 16 is close to the high-voltage part of the transformer 10, it is preferably formed of an electrically insulating material such as synthetic resin.

With the above configuration, air sucked in from the intake hole 12 by the operation of the blower 13 enters the cover 16, passes through the gap G, and is blown into the machine room 11.

That is, since the cooling air converges through the gap G between the opening 16A of the cover 16 and the outer circumference of the transformer 10 and increases the flow velocity, the cooling air passes through the core surface 1 of the transformer 10.
9. It is possible to contact the windings 20 and the like more efficiently than before and cool them. That is, this cover 16 serves as a duct, and the air sucked in from the intake hole 12 is supplied to the rear of the transformer 10 as much as possible.

Therefore, if the cooling efficiency of the transformer 10 can be increased as described above, the transformer 10 can be downgraded by reducing the winding length or reducing the core material.

As a means of improving the cooling efficiency of the transformer 10, there is a method of enlarging the opening area of the intake hole 12, but the strength of the outer wall of the main body 1 is weakened and the blower 13 and the transformer cooling section are separated from each other. Therefore, the cooling air is dispersed and is not very effective.

The high-frequency heating device according to the present invention can improve the cooling efficiency of the high-voltage transformer by cooling air without improving the blowing function by simply improving the high-voltage transformer for supplying high voltage to the high-frequency oscillator with a blower guide cover. As a result, the high voltage transformer can be downgraded and offered to the market as an inexpensive product. Further, in the present invention, since the lead wire is drawn out from the opening in the cover through which a part of the transformer projects, the lead wire can conveniently prevent the cover from coming off.

[Brief explanation of the drawing]

FIG. 1 is a top view showing the structure of a high-frequency heating device to which the present invention is applied, and FIG. 2 is a top view of the same device as above.
FIG. 3 is a perspective view showing a state in which a high voltage transformer is attached to the air guide cover. 1...High frequency heating device main body, 8...High frequency oscillator, 10...High voltage transformer, 12...Intake hole, 1
3...Blower, 16...Blower guide cover, 16A
...Opening, 17...Lead wire, G...Gap.

Claims (1)

[Claims for Utility Model Registration] (1) In a high-frequency heating device having a main body equipped with a high-voltage transformer for supplying high voltage to a high-frequency oscillator and having a passage for cooling air by a blower, a position near the high-voltage transformer on the wall of the main body. An intake hole communicating with the cooling air passage is provided in the cover, and the cover covers the entire lower part of the high-voltage transformer, the upper part of the high-voltage transformer having an opening protruding with a gap and communicating with the intake hole. By providing a ventilation guide cover with a space and pulling out the lead wire of the high voltage transformer to the outside through the opening,
A high-frequency heating device characterized in that the lead wire prevents the cover from coming off. (2) The high-frequency heating device according to claim 1, wherein the intake hole is provided on the high-voltage transformer mounting surface of the main body wall. (3) The high-frequency heating device according to claim 1 or 2, wherein the air guide cover is made of an electrically insulating material such as synthetic resin.