JPH02186533A - Magnetron - Google Patents

Abstract

PURPOSE:To make the size of a magnetron small and lower its noise by transmitting heat to the outside of a magnetic circuit from a magnetron main body by a metal block and installing a radiator fin in the outside of the magnetic circuit. CONSTITUTION:A magnetron 10 has a cooler 1 formed with metal blocks and having radiator fins in both sides of a magnetic circuit 2, an antenna 3 which gets output of microwave, and a filter case 4 of an electric supplying part. A magnetron main body 7 is press-put in the center part of the cooler 1 and at the time of use, since a wave-guide tube 6 is attached to the magnetron 10, a cooling wind is blown from the direction shown by an arrow 5. In the case of operation within a few minutes, the cooling fan does not work, but in the case of repeated short-time user or continuous operation, the cooling fan is operated by detection of the temperature of the magnetron 10, and therefore static pressure of the fan can be lowered. As a result, the size of the magnetron is made small and the noise of the fan can be lowered owing to improved cooling ability of the fan.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling structure for Magne I-ron used in microwave ovens and the like.

[Conventional technology]

Generally, magnetrons reach high temperatures during operation, so a plurality of cooling fins are press-fitted and fixed to the outer periphery of the main body. FIG. 4 shows a typical appearance of a conventional magnetron. The basic shape uses almost square cooling fins, and in order to improve cooling performance within this range,
Improvements such as those shown in Publication No. 4.3 continue.

[Problem to be solved by the invention]

In recent years, microwave ovens have become more diverse, and in order to expand cooking stove space and reduce external dimensions, power transformers have become smaller, and inverter power supplies have been put into practical use to make them lighter and more compact. Despite such technological advances, the basic structure of the magnetron has remained the same, and this has become a bottleneck in the miniaturization of microwave ovens.

Furthermore, due to the magnetron's cooling structure, it is necessary to use a fan with high static pressure, which makes a lot of noise during cooling.In this era, a silent microwave oven is strongly desired, such as when using a personal microwave oven to boil coffee at night. became.

There are limitations in meeting the above needs with conventional magnetron structures, and the purpose of the present invention is to develop a magnetron that does not take the conventional basic form.

[Means for solving problems]

The above purpose is to conduct heat from the magnetron body to the outside of the magnetic circuit through the metal block.
This is achieved by providing radiator fins outside the magnetic circuit. In addition, a notch is provided in the block portion of the radiator to facilitate press-fitting into the magnetron body.

[Effect]

By using this type of heatsink, (1) the width of the magnetron can be reduced to approximately 60% or less of that of conventional products, and (2) the heatsinks protrude from both sites, so the effect of natural air cooling is greater than that of conventional products. (3) By increasing the surface area of the fins, it is possible to use a fan with a static pressure of J/2, reducing noise. (4) The thermal mass of the metal block can be reduced. (5) The magnetron body and the metal block can be attached by press-fitting, so there is no need for screws.

〔Example〕

FIGS. 1(a) and 1(b) show a magnetron 10 according to an embodiment of the present invention, in which FIG. 1(a) is a two-sided view, and FIG.
) is a front view. The cooler is formed of a metal block and has a structure with radiator fins on both sides of the magnetic circuit 2. 3 is an antenna that obtains microwave output. 4 is a filter case in the city area. When in use, since the waveguide 6 is attached to the Magne 1 Heron, cooling air is applied from the direction shown by the arrow.

FIG. 2 is a two-sided view of only the cooler 1 shown in FIG. 1. The magnetron main body 7 is press-fitted into the central part. Since the magnetron body 7 cannot be press-fitted in the metal block as it is, notches 8 are formed on both sides of the center and the magnetron body 7 is press-fitted using its elasticity.

FIG. 3 shows the magnetron 10 according to the invention and the electronic
An example is shown below. In most cases, heating coffee or food takes less than a few minutes. In this case, the cooling fan 12 does not operate. The temperature rise of the magnetron 10 is mainly due to natural air cooling. In order to increase the efficiency of natural air cooling, the cooling capacity can be further increased by locating it in a position that creates a smoke-emitting effect.

When short-term use is repeated or when continuous operation is performed, the magnet (cooling fan that detects the temperature of ~ Ron 10) is operated.In this case, the fan also has a lower static pressure than the conventional method. The wind speed is also reduced to less than 1/2, so there is no buzzing noise.In addition, in Figure 3,
13 indicates a power source, and 14 indicates an air flow.

In the embodiment described above, by subjecting the radiator fin portion to black alumite treatment, the heat dissipation efficiency can of course be improved by -1.

〔Effect of the invention〕

By using the magnetron of the present invention, it is possible to obtain a small microwave oven with a magnetron installation space 60% smaller than that of a conventional microwave oven, and a microwave oven with less fan noise due to the improved cooling capacity.

[Brief explanation of the drawing]

FIG. 1(a) is a top view of an embodiment of the magnetron according to the present invention, FIG. 1(b) is a front view thereof, and FIG. FIG. 3 is a diagram showing an example of a microwave oven using the magnetron of the present invention, and FIG. 4 is a diagram for explaining the basic type of a conventional magnetron. ]...Cooler, 2...Magnetic circuit, 3...Antenna, 4...Filter case, 5...Cooling air, 6...
waveguide.

Claims (1)

[Claims] 1. A magnetron consisting of a magnetron body, a magnetic circuit, and a cooler. A magnetron characterized by being provided with. 2. The magnetron according to claim 1, wherein a notch is continuously formed in a portion of the block portion into which the magnetron body is press-fitted.