JPS59165335A - Magnetron device - Google Patents

Abstract

PURPOSE:To obtain a good heat radiation effect and improve the work efficiency of mounting a radiation plate by forming a protruded region provided on the radiation plate with a first protrusion part with a protruded cross section, second protrusion part with a recessed cross section, and third protrusion part with a protruded cross section and inserting the second protrusion part between the first and third protrusion parts of the adjacent radiation plate. CONSTITUTION:The first protruded region 35 of each radiation plate 3 consists of a first protrusion part 35a with a protruded cross section, second protrusion part 35b with a recessed cross section following it, and third protrusion part 35c with a protruded cross section following it, and the second protruded region 36 has also the same form. An assembly state is completed by separately inserting the second protrusion parts 35b and 36b of the first radiation plate 3 located at the uppermost stage between the first protrusion part 35a and 36a and third protrusion parts 35c and 36c of the second radiation plate 3 adjacent to the first radiation plate 3 (at the lower stage by one than the uppermost stage).

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 being adopted.

However, there are limitations to the number of heat sinks used and the installation space.
Furthermore, if an attempt is made to completely press the both side edges of the heat sink against the both side walls of the frame-shaped yoke, misalignment of the heat sink during press-fitting, particularly in the direction of rotational force, will not be tolerated; Assembly efficiency decreases. Furthermore, a heat dissipation plate having a protruding portion tends to bend in one direction, and this tendency is particularly noticeable in a heat dissipation plate having both side edges pressed against both side walls of a frame-shaped yoke.

Purpose of invention failure F! A provides a magnetron device that eliminates the conventional drawbacks as described above.

Structure of the Invention In the magnetron device of the present invention, an elongated protruding area along the side edge 9 is provided between the circular hole of the heat sink and the side line part, and this protruding area has a rectangular cross section. It is formed by a protrusion, a second protrusion having a υ-shaped cross section following the protrusion, and a third protrusion having a convex cross-section following the second protrusion. Since the second protrusion is inserted between the first protrusion and the third protrusion of the adjacent heat sink, the details thereof will be explained below together with the illustrated embodiments.

DESCRIPTION OF THE EMBODIMENTS As shown in FIG. 1, the magnetron 1 is constructed by attaching first to fourth heat sinks 3 made of aluminum or aluminum alloy in multiple stages to the outer peripheral surface of a cylindrical anode portion 2. 3 is exposed to a cooling air flow flowing between the plates. A pair of 21 magnetic pole pieces facing each other is enclosed in the upper and lower parts of the anode part 2, and first and second annular permanent magnets 4 and 6 stacked on the outer end surfaces of both magnetic pole pieces are as follows: Together with the frame-shaped yoke 6 having an opening-shaped cross section, it constitutes a magnetic circuit. Both side edges 31 and 32 of the first to fourth heat sinks 3 bent at right angles are in pressure contact with the side walls 7 and 8 of the frame-shaped yoke 6. Reference numeral 9 indicates an electron emitting section of the magnetron 1.

As shown in FIG. 2, each heat dissipation plate 3 has an elongated first protruding region 36 along the side edge 31Vc between the circular hole 34 having a collar 33 and the side edge 31. Edge 3
2, an elongated second protruding region 3 along the side edge 32;
6. The cylindrical anode portion 2 of the magnetron 1 is press-fitted into the collared circular hole 34, and the first protruding region 36 includes a first protruding portion 35a having a rectangular cross section, and a second protruding portion 35a having a rectangular cross section following the first protruding portion 35a. The second protruding area 36 is composed of a protruding part 35b and a third protruding part 35c having a convex cross section following the protruding part 35b.
It consists of a first protrusion 36a with a convex cross section, a second protrusion 36b with a V-shaped cross section, and a third protrusion 36c with a convex cross section. The second protrusions 35b and 3eb of the first heat sink 3 located at the top level are the first protrusions 36a of the second heat sink 3 adjacent thereto (one level below the top level). .

36a and the third protrusions 35c and 36c, the assembled state as shown in FIG. 1 is obtained.

In the magnetron device configured in this way, the heat sink 3
The appendix 2 of the magnetron 1 is placed in the collared circular hole 34 of the magnetron 1.
When press-fitting, at least the adjacent heat sinks intertwine with each other in their protruding regions 3Eii, 36, so that the direction of mounting the heat sinks, especially the direction of the rotational force, is naturally regulated. In addition, since the protrusion region is composed of a first protrusion with a convex cross section, a second protrusion with a U-shaped cross section, and a third protrusion with a convex cross section, the area of contact with the air cooling air flow is Not only is it enlarged, but it also becomes less likely to warp in one direction even after stretching and contracting.

In order to further increase the mechanical strength in the direction along the plate surface of the heat sink, the length of the second protrusion with a V-shaped cross section is made approximately equal to the total length of the first and third protrusion parts with a convex cross section. be able to. Also, one of the two protruding regions 35, 36 can be omitted.

Effects of the Invention Since the magnetron device of the present invention is configured as described above, not only the size and number of heat sinks are limited, but also deformation of the heat sink, such as warping, can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a side view of a magnetron device implementing the present invention;
FIG. 2 is a perspective view of the heat sink of the device. 1...Magnetron, 2...Mountain/cylindrical anode part,
3... Heat sink, 6... Frame-shaped yoke, 34
......Circular hole, 35.36...Protrusion area, 35a, 36a, old...First protrusion, 36b,
3e b--curved second protrusion, 36c. 36c...Third protrusion.

Claims (1)

[Claims] Each of the plurality of heat sinks attached to the cylindrical anode part of the magnetron in multiple stages and exposed to the air-cooled airflow is pressed into contact with the collared circular hole into which the anode part is press-fitted, and the side wall of the frame-shaped yoke for configuring the magnetic circuit. and a slender protruding area along the side line part, the protruding area includes a first protruding part having a V-shaped cross section, a second protruding part having a continuation surface υ-shaped, and and a third protrusion having a rectangular cross section following the above, and the second protrusion is inserted between the first protrusion and the third protrusion of an adjacent heat sink.