JPH053096B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a forced air-cooled magnetron device used in microwave ovens and the like.

Conventional configurations and their problems In general, in forced air-cooled magnetron devices used in microwave ovens, etc., a plurality of heat sinks are attached to the cylindrical anode of the magnetron, and air cooling airflow is applied between the heat sinks. It is configured to be distributed. This prevents the anode section from becoming abnormally high temperature and the permanent magnet provided on the anode section from being demagnetized at high temperatures.To this end, the surface area of the heat sink must be as large as possible, and the air cooling It is important to have a wide area of contact with the Conventionally, methods such as providing a protruding part on the heat sink, pressing both side edges of the heat sink against both side walls of the frame-shaped yoke, or press-fitting the anode part into a circular hole with a collar provided on the heat sink have been proposed. method is adopted.

However, there are limits to the number of heat sinks that can be used and the space available for installation, and when attempting to completely press-fit both side edges of the heat sink to both side walls of the frame-shaped yoke, it is difficult to Misalignment, especially misalignment in the rotational direction, will no longer be tolerated, resulting in a decrease in assembly efficiency. Furthermore, a heat sink having a protruding portion tends to warp in one direction, and this tendency is particularly noticeable when both side edges are pressed against both side walls of a frame-shaped yoke.

OBJECTS OF THE INVENTION The present invention provides a magnetron device that eliminates the drawbacks of the prior art as mentioned above.

Structure of the invention The heat sink in the magnetron device of the invention is
It has elongated protruding areas on both sides of the collared circular hole into which the anode part is press-fitted. Each of the protruding regions includes a first protruding portion having a cross section (shaped) arranged in a line along the side edge that presses against the side wall of the frame-shaped yoke for configuring a magnetic circuit, a second protruding portion having a cross section (shaped) close to the circular hole, and The plate is divided into three parts to form a third protrusion having a cross section (shaped), and protrudes alternately and in a semi-cylindrical shape from the plate surface in two directions up and down, and is connected to each other on the side edge side.The second protrusion is
It is configured to fit between the first and third protrusions of adjacent heat sinks, and its details will be explained below together with the illustrated embodiments.

DESCRIPTION OF THE EMBODIMENTS As shown in FIG. 1, the magnetron 1 has first to fourth heat sinks 3 made of aluminum or aluminum alloy attached to the outer peripheral surface of a cylindrical anode portion 2 in multiple stages. 3 is exposed to a cooling air flow flowing between the plates. A pair of opposing magnetic pole pieces is enclosed in the upper and lower parts of the anode part 2, and the first and second annular permanent magnets 4 and 5 stacked on the outer end surfaces of both magnetic pole pieces have a cross section. Together with the mouth-shaped frame-shaped yoke 6, it constitutes a magnetic circuit. Then, on both side walls 7 and 8 of the frame-shaped yoke 6, both side edges 3 of the first to fourth heat sinks 3 are bent downward at right angles.
1 and 32 are in pressure contact. Reference numeral 9 indicates an electron emitting section of the magnetron 1.

As shown in FIG. 2, each heat sink 3 has an elongated first projecting region 35 along the side edge 31 between the circular hole 34 having a collar 33 and the side edge 31. It has an elongated second protruding region 36 along the side edge 32 between the side edge 32 and the side edge 32 . The cylindrical anode portion 2 of the magnetron 1 is press-fitted into the collared circular hole 34, and the first protruding region 35
consists of a first protrusion 35a with a cross section (shaped), a second protrusion 35b with a cross section (shaped) following this, and a third protrusion 35c with a cross section (shaped) following this. That is, the first protrusion region 35 is , a first protrusion 35a lined up along the side edge 31, and a second protrusion 35a adjacent to the circular hole 34.
It is divided into three parts to form a protruding part 35b and a third protruding part 35c, which protrude alternately in two directions upward and downward from the plate surface in a semi-cylindrical shape, and are connected to each other on the side edge part 31 side. The second protrusion region 36 also includes a first protrusion 36a with a cross section (shaped) and a second protrusion 36a with a cross section (shaped) following this.
It consists of a protruding part 36b and a third protruding part 36c which is shaped like a cross section.The second protruding parts 35b and 36b of the first heat sink 3 located at the uppermost stage are
By entering between the first protrusions 35a, 36a and the third protrusions 35c, 36c of the second heat dissipation plate 3 adjacent to this (one step below the top), as shown in FIG. The assembled state will look like this.

In a magnetron device configured in this way,
When the anode part 2 of the magnetron 1 is press-fitted into the collared circular hole 34 of the heat sink 3, at least the adjacent heat sinks become intertwined with each other in their protruding areas 35, 36. The direction is automatically regulated. In addition, the second protrusion close to the anode part 2 of the magnetron 1 reaches a high temperature during operation of the device and tends to cause a thermal expansion film. Since the protruding portion is configured to protrude in the opposite direction, the heat dissipation plate 3 has its both side edges 3
1 and 32 are pressed against both side walls 7 and 8 of the frame-shaped yoke 6, they do not warp in one direction. Furthermore, although both the protruding regions 35 and 36 are each divided into three parts, since they are interconnected on the side edge side, the temperature distribution is flattened, and the second
Only the protruding portion is prevented from being heated to an abnormally high temperature or deformed.

In order to further increase the mechanical strength in the direction along the plate surface of the heat sink, it is preferable that the length of the second protrusion is approximately equal to the total length of the first protrusion and the third protrusion.

Effects of the Invention Since the magnetron device of the present invention is configured as described above, it is possible to obtain a good heat radiation effect while using a limited size and number of heat sinks. Not only can efficiency be improved, but also deformation such as warping of the heat sink can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a side view of a magnetron device embodying the present invention, and FIG. 2 is a perspective view of a heat sink of the same device. 1... Magnetron, 2... Cylindrical anode part, 3...
...Radiation plate, 6...Frame yoke, 34...Circular hole, 3
5, 36...protrusion area, 35a, 36a...first
Projections, 35b, 36b...Second projections, 35
c, 36c...Third protrusion.

Claims (1)

[Claims] 1. Each of the plurality of heat sinks attached to the cylindrical anode part of the magnetron in multiple stages and exposed to the air-cooling airflow has elongated protruding regions on both sides of a collared circular hole into which the anode part is press-fitted, and each of the plurality of heat dissipating plates is a first protrusion in cross section (shaped) that is lined up in a row along the side edge that presses against the side wall of the frame-shaped yoke for configuring a magnetic circuit, a second protrusion in cross section (shaped in the vicinity of the circular hole), and a cross section (shaped in It is divided into three parts to form a third protrusion, and protrudes alternately and in a semi-cylindrical shape from the plate surface in two directions, up and down.
A magnetron device characterized in that the peripheral edge portions are interconnected and the second protruding portion is inserted between the first protruding portion and the third protruding portion of adjacent heat sinks.