JPH0127540B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetron that facilitates miniaturization of magnetron-based devices such as electronic ranges.

FIG. 1 is a schematic diagram of an electronic range using a conventional magnetron. The magnetron 1, which uses a forced air cooling method to dissipate heat due to anode loss, is equipped with cooling fins laminated in multiple layers in the tube axis direction on the outside. The cooling air flow sent from the opening of the blower 2 to between the cooling fins of the magnetron 1 adjacent to this opening takes away the heat generated by the anode loss from the fins, and the air itself becomes high temperature and cools the cooling fins. It is discharged from between. A part of this exhaust airflow is guided through a duct 4 with a rectangular cross section, changes direction almost at right angles, enters the heating chamber of the electronic range, drives a stirrer placed in the upper part of the heating chamber, and passes through the exhaust hole 9 to generate electrons. Released outside the range. Further, the remaining part of the airflow discharged from the cooling fins of the magnetron 1 is separated by a partition plate 5 provided to prevent this airflow from recirculating into the surrounding space that houses the power supply section such as the transformer 7. It passes through the air path and is exhausted from the air exhaust hole 6 to the outside of the electronic range. Like this, magnetron 1
The reason why the airflow that has passed through the cooling fins of It is difficult to provide large ventilation holes that would increase energy leakage, and since the duct and heating chamber and the heating chamber and the outside are usually connected through small holes, the pressure loss of the cooling air is significant. Since the amount of cooling air provided by the flow path alone would be insufficient, an open flow path was provided that could flow a large amount of cooling air without having to take into account microwave energy leakage. The airflow on the intake side of the blower 2 functions to cool the power supply section such as the transformer 7. Without the duct 4 and the partition plate 5, a recirculating airflow would occur through the space housing the power source, resulting in insufficient cooling of both the power source and the magnetron. Therefore, the duct 4 and the partition plate 5
And many of the parts for these installations are essential for electronic range using conventional magnetrons, and because of these items,
This has significantly hindered the miniaturization of devices such as electronic ranges that use magnetrons. Note that 3 in FIG. 1 is a waveguide that guides the microwave output of the magnetron 1 to the heating chamber.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that eliminates the problem of conventional forced air-cooled magnetrons, which prevents miniaturization of magnetron-based devices due to the cooling air exhaust path as described above.

In order to achieve the above object, in the present invention,
A flow guide is provided for discharging cooling air from the cooling fins in two directions substantially perpendicular to the cooling air feeding direction while remaining parallel to the surface of the fins.

FIG. 2 is a diagram showing an example of a cooling fin 11 of a conventional forced air-cooled magnetron. The central part is provided with a bar ring 12 that is in contact with the magnetron heat generating part, and the both ends parallel to the cooling air are bent and raised parts 1.
3 is provided to act as a draft guide to prevent cooling air from leaking to the sides.

FIG. 3 is a diagram showing a cooling fin 21 according to an embodiment of the present invention, in which the bending portions 23 at both ends of the fin are only partially bent, and the leeward end of the fin has a portion where the wind travels straight. Barrier or wind guide 24 to prevent the flow and separate the flow to both sides.
is formed. FIG. 4 shows an embodiment of the present invention in which the cooling fins shown in FIG. 3 are stacked in multiple layers in the tube axis direction. As a result of this structure, the cooling air is discharged in two directions substantially perpendicular to the feeding direction, as shown by arrows in FIG. When the magnetron of this embodiment is used in place of the conventional magnetron shown in FIG. If the duct 4 and the partition plate 5 are arranged so as to be in contact with the exhaust hole provided in the electronic range case, the space occupied by the duct 4 etc. is no longer necessary.
It's easy to understand from the diagram. For cooling fins that have a frame-shaped magnetic yoke on the outside, instead of processing the ends of the cooling fins themselves to use them as airflow guides,
By changing the shape of a part of the magnetic yoke, it can be used as a wind flow guide.

As explained above, according to the present invention, ducts, partition plates, and their mounting parts are all unnecessary, and at the same time, the space previously occupied by ducts is no longer necessary, making it easy to downsize the entire magnetron-using device. The following effects can be obtained.

[Brief explanation of drawings]

Fig. 1 is a sketch of an electron range using a conventional magnetron, Fig. 2 is a drawing showing cooling fins of a conventional magnetron, Fig. 3 is a drawing showing cooling fins of an embodiment of the present invention, and Fig. 4 is a drawing showing cooling fins of an embodiment of the present invention. FIG. 4 is a diagram showing an embodiment of the present invention using the fins shown in FIG. 3; 1... Magnetron, 2... Blower, 4... Duct,
5... Partition plate, 11, 21... Cooling fin, 12... Burring, 13, 23... Bending portion, 24... Air flow guide.

Claims (1)

[Claims] 1 In a magnetron that performs forced air cooling by sending airflow parallel to the surfaces of multiple stacked cooling fins,
A bent portion is provided at both windward ends of the cooling fin itself to cover the gap between the stacked cooling fins, and a bent portion is provided at the leeward end of the cooling fin itself to direct cooling air to the surface of the fin. A magnetron characterized by forming a flow guide that discharges air in two directions parallel to each other and substantially perpendicular to the feeding direction.