JPS6322037B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a high-frequency heating device equipped with a high-frequency oscillator and a fan for cooling electrical components that become hot during operation of the high-frequency oscillator.

Generally, high-frequency heating devices such as the magnetron (high-frequency oscillator) in a microwave oven and the high-voltage transformer (electrical components) connected to the magnetron generate high heat during operation, so a cooling mechanism is installed to cool them down. ing. This cooling mechanism includes an air injection device (blower), a propeller fan, etc., but a fan is often used from the viewpoint of cost.

FIG. 1 shows a schematic configuration of the entire high-frequency heating device of this type, where 1 is a case and 2 is a heating chamber. A storage chamber 3 for electrical components is formed between the case 1 and the heating chamber 2. A magnetron 4 attached to the heating chamber 2 is disposed above the storage chamber 3. Further, a high voltage transformer 5 is arranged at the lower part of the storage chamber 3. Reference numeral 6 denotes a fan provided inside the storage chamber 3. By driving this fan 6, as shown in FIG.
Air is sucked into the tube, and the sucked air is blown onto the magnetron 4, high-voltage transformer 5, etc. to cool them. The cooling air that cooled the magnetron 4 is sent to the duct 9.
After being guided into the heating chamber 2 through the heating chamber 2, it is discharged to the outside. Further, the cooling air that has cooled the high voltage transformer 5 is discharged to the outside through a large number of through holes 11 provided in the bottom plate 10 of the case 1.

By the way, the magnetron 4 disposed in the upper part of the storage chamber 3 and the high voltage transformer 5 disposed in the lower part of the storage chamber 3 are cooled by the same fan 6. In this case, Juan 6
If the high-voltage transformer 5 is placed in the upper part of the storage chamber 3, that is, close to the magnetron 4 side, the high-voltage transformer 5 cannot be effectively cooled, so there is a problem that the high-voltage transformer 5 is overheated and its durability is reduced. be. Therefore, in order to improve the durability of the high voltage transformer 5, it is necessary to increase the wire diameter of each coil of the high voltage transformer 5, which has the drawback of increasing the size and cost of the high voltage transformer 5. Furthermore, if the fan 6 is placed in the lower part of the storage chamber 3, that is, close to the high-voltage transformer 5 side, the magnetron 4 cannot be effectively cooled, so the anode of the magnetron 4 becomes insufficiently cooled. There was a problem that the performance of the magnetron 4 suddenly decreased and its durability deteriorated. Therefore, the fan 6 had to be installed in a position where it could effectively cool both the magnetron 4 and the high-voltage transformer 5 at the same time, so the installation of the fan 6, especially the upper and lower positions of the storage chamber 3, There was a problem that it became troublesome. Further, since the back plate 7 of the case 1 was provided with a large number of through holes 8, the appearance was not only bad, but there was also a risk that, for example, rod-shaped foreign objects could be inserted through these through holes 8. Furthermore, the back plate 7
Since air was sucked into the storage chamber 3 from the outside through the through holes 8, there was also the drawback that the back plate 7 could not be installed with it pressed against a wall or the like.

This invention was made based on the above circumstances, and its purpose is to effectively cool a high-frequency oscillator and a high-voltage transformer that becomes hot during operation of the high-frequency oscillator, and to easily install a fan. To provide a high-frequency heating device which has a good appearance, can be installed relatively freely in any place, has no danger of rod-shaped foreign objects etc. being inserted into a storage chamber, and has a good appearance.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.
This will be explained with reference to the figures. In addition, Figures 3 and 4
In the figure, the same parts as in FIGS. 1 and 2 are given the same reference numerals, and the explanation thereof will be omitted. 21 is a case, and a high voltage transformer (electrical component) 23 is mounted on the bottom plate 22 of this case 21. A fan 24 is arranged above the high voltage transformer 23. Further, on the bottom plate 22 of the case 21, a large number of suction holes 25 are provided on the side where the cooling air is sucked by the fan 24, and a large number of exhaust holes 25 are provided on the side where the cooling air is blown out by the fan 24.
6... is provided. Therefore, Juan 24
When the fan 24 is driven, air is sucked into the storage chamber 3 from the outside through the suction holes 25, as shown in FIGS. The remainder flows along the outer surface of the high voltage transformer 23 and drains into the discharge hole 2.
6. It is designed to be discharged to the outside from... Furthermore, a partition portion 2 is provided on the upper surface of the high voltage transformer 23.
7 is provided to protrude upward. This partition portion 27 is formed to be long in a direction perpendicular to the direction in which the cooling air is blown out by the fan 24, and the storage chamber 3 is partitioned into a suction side and a discharge side by this partition portion 27. There is. In addition, 2
8 is a support leg attached to the bottom plate 21 of the case 21.

Therefore, in the case of the above configuration, fan 2
4 is driven, the air sucked into the storage chamber 3 from the suction holes 25 rises along one side of the high-pressure transformer 23 (the side located on the suction side of the storage chamber 3). A portion of the cooling air rising to the upper part of the storage chamber 3 is blown onto the magnetron 4 by the fan 24, so that the magnetron 4 can be sufficiently cooled. Further, the remaining cooling air that has risen descends along the other side surface of the high-voltage transformer 23 (the side surface located on the discharge side of the storage chamber 3) and is discharged to the outside through the discharge hole 26.
Therefore, after the high-pressure transformer 23 is cooled once by the cooling air sucked in from the suction holes 25 and rising, the high-pressure transformer 23 is cooled again by the cooling air blown out by the fan 24 and descending. Therefore, the high voltage transformer 23 can be effectively cooled. Therefore, in the high voltage transformer 23, it is not necessarily necessary to increase the wire diameter of each coil as in the conventional case, which is advantageous in reducing the size and cost of the high voltage transformer 23. In this case, since the high voltage transformer 23 is provided with the partition section 27, the flow of cooling air can be adjusted, and the partition section 27 itself is also cooled by the cooling air, further improving the cooling effect of the high voltage transformer 23. can be done. Furthermore, since the fan 24 can be placed in the upper part of the storage chamber 3, that is, close to the magnetron 4 side, the magnetron 4 can be cooled in a suburban manner, and the durability of the magnetron 4 can be improved. Can be done. Further, since the cooling air blown from the fan 24 does not necessarily need to be blown directly onto the high-voltage transformer 23, the upper and lower positions of the fan 24 within the storage chamber 3 can be set more easily than in the past. Furthermore, since the back plate of the case 21 does not have a through hole as in the conventional case, the appearance can be improved, and the risk of foreign objects on the rod being inserted into the storage chamber 3 through the through hole can also be eliminated. .
Furthermore, since the main body can be installed with the back plate pressed against a kitchen wall or the like, the installation location can be selected more freely than before.

Note that this invention is not limited to the above embodiments. For example, the storage chamber 3 may be provided with a guide plate for guiding the flow of cooling air. It goes without saying that various other modifications can be made without departing from the gist of the invention.

As established above, the present invention includes a high-voltage transformer disposed on the bottom plate of an electrical parts storage chamber, a fan above the high-voltage transformer, and a fan facing the fan on the downstream side with respect to the flow direction of the air blown from the fan. A high-frequency oscillator is installed in each part, and a cooling air suction hole is installed in a part of the bottom plate facing the upstream side with respect to the flow direction of the air blown out by the fan, and a cooling air suction hole is installed in a part of the bottom plate facing the upstream side with respect to the flow direction of the air blown out from the fan. Cooling air exhaust holes are formed in the parts where the electric parts are stored, and cooling air passages are formed in which the intake air from the fan and the air blown out from the fan flow along the circumferential surface of the high voltage transformer. Therefore, after the high-voltage transformer is cooled once by the cooling air sucked in from the suction hole and rising inside the storage chamber, the high-voltage transformer can be cooled again by the cooling air descending inside the storage chamber.
Since the electrical components can be cooled subtly, and the fan can be disposed close to the high frequency oscillator, the high frequency oscillator can also be cooled subtly. Furthermore, since the cooling air blown from the fan does not necessarily have to be blown directly onto the electrical components, the upper and lower positions of the fan within the storage chamber can be relatively easily set. Furthermore, since the suction hole and the discharge hole are provided on the bottom plate of the case, there is no risk of rod-shaped foreign objects being inserted into the storage chamber, and the appearance is good. Furthermore, since it can be installed pressed against a kitchen wall, etc., the installation location can be selected relatively freely.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional example, with Figure 1 being a partially cutaway perspective view of the overall configuration;
The figure is a side view showing the configuration of the main parts, FIGS. 3 and 4 show an embodiment of the invention, FIG. 3 is a side view showing the structure of the main parts, and FIG. 4 is a plan view of the same. . 2... Heating chamber, 3... Storage chamber, 4... Magnetron (high frequency oscillator), 21... Case, 22...
...Bottom plate, 23...High voltage transformer (electrical parts), 2
4...fan, 25...intake port, 26...exhaust port.

Claims (1)

[Claims] 1. A storage chamber for electrical components is formed between the case and the heating chamber, and a high-frequency oscillator, a high-voltage transformer that becomes hot during operation of the high-frequency oscillator, and these electrical components are cooled in the storage chamber. In a high-frequency heating device in which fans are respectively disposed, the high-voltage transformer is disposed on the bottom plate of the case, the fan is placed above the high-voltage transformer, and the fan is placed on the downstream side with respect to the flow direction of the air blown from the fan. The high-frequency oscillators are respectively disposed at positions facing the fan, and a cooling air suction hole and a cooling air suction hole are provided at a part of the bottom plate facing the upstream side with respect to the flow direction of the air blown from the fan. Cooling air discharge holes are formed in downstream and opposing parts, respectively, and the suction air from the fan and the air blown from the fan flow along the circumferential surface of the high voltage transformer, respectively, into the electrical component storage chamber. A high-frequency heating device characterized by forming a cooling air passage. 2. The high-frequency heating device according to claim 1, wherein the high-voltage transformer has a partition portion on the upper surface that partitions the storage chamber into a cooling air suction side and a cooling air discharge side.