JPS586136Y2 - magnetron device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetron device consisting of a magnetron tube, a magnetic circuit coupled to the magnetron tube, a shield case and a heat sink attached to a frame-shaped yoke of the magnetic circuit. One magnetic pole of an annular permanent magnet stacked on the outer end of one magnetic pole piece of the magnetron tube via an annular yoke plate is magnetically coupled to the magnetic pole piece, and the other magnetic pole of the permanent magnet is connected to the outer end of one magnetic pole piece of the magnetron tube. right and left outer edges of a heat sink which is magnetically coupled to the other magnetic pole piece through a frame-shaped yoke, and whose central hole periphery is sandwiched between the one magnetic pole piece and the large-diameter annular region of the annular yoke plate; by bending it toward the permanent magnet side, and penetrating the tongue-like part at the edge through the bottom plate part of the frame-shaped yoke and the bottom plate part of the shield case superimposed thereon) or twisting it. The shield case is secured to the frame-shaped yoke.

To explain the magnetron device of the present invention together with the embodiment shown in the drawings, in FIG.
A first annular permanent magnet 4 coaxially stacked on the outer end surface of the magnetic pole piece 2 via a first annular yoke plate 3 magnetically couples one magnetic pole N to the first magnetic pole piece 2. The second annular permanent magnet 1, which is coaxially stacked on the outer end surface of the second magnetic pole piece 5 of the magnetron tube via the second annular yoke plate 6, has one magnetic pole S connected to the second magnetic pole piece S. It is magnetically coupled to the pole piece 5.

The other magnetic pole S of the first annular permanent magnet 4 is magnetically coupled to the other magnetic pole N of the second annular permanent magnet 7 via the frame-shaped yoke 8. The second annular yoke plate 3, 6, the first. The second annular permanent magnets 4, 7 and the frame-shaped yoke 8 constitute a magnetic circuit for the magnetron tube 1.

As shown in FIG. 2, the first annular yoke plate 3 consists of an annular region 9 with a small diameter, an annular region 10 with a large diameter, and an inclined annular region 11 located between both annular regions 9 and 10. The small annular region 9 abuts the outer end surface of the first magnetic pole piece 2, and the large diameter annular region 10 abuts the lower surface of the first annular permanent magnet 4, thereby exerting a magnetic flux concentration effect.

Further, the second annular yoke plate 6 also has the same shape as the first annular yoke plate 3.

The heat sink 12 provided between the first magnetic pole piece 2 and the first annular yoke plate 3 is made of a non-magnetic and highly thermally conductive metal plate such as aluminum or aluminum alloy. The outer edge is bent at a right angle to form a mouth-like cross-sectional shape, the top plate part 13 has a central hole 14, and each of the left and right outer edges 15, 16 has a large number of tongue-shaped parts 17 with a length of about 1 crn. .18 each.

In addition, in order to direct the forced air cooling airflow flowing in the direction shown by the arrow in the figure toward the permanent magnet 4 side, the left and right outer edges 15,
16 is made smaller at the rear than at the front.

The peripheral edge of the central hole 14 of the heat sink 12 is held between the first magnetic pole piece 2 and the first annular yoke plate 3.

Further, the tongue-shaped portions 17.18 of the heat dissipation plate 12 penetrate the bottom plate portion of the frame-shaped yoke 8 and the bottom plate portion of the shield case 19 superimposed on the outer end surface thereof, and then reach each node of the left and right outer edges 15.16. It can be bent approximately at right angles to the other side, or it can be twisted approximately 90 degrees without being bent.

Thereby, the heat sink 12 is connected to the first pole piece 2 and the first pole piece 2.
It is not only thermally coupled to the annular permanent magnet 4 but also coupled to the shield case 19, and the shield case 19 is locked to the frame-shaped yoke 8.

20 is an electromagnetic wave radiation antenna, 21 is a stem for leading out a cathode terminal, 22 is a choke coil, 23 is a capacitor, and 24 is a heat radiation vane plate attached in multiple stages to the outer peripheral surface of the magnetron tube anode cylinder.

In the magnetron device according to the present invention configured as described above, the first magnetic pole piece 2 and the first annular permanent magnet 4 of the magnetron tube 1 reach a high temperature during operation of the device, especially due to heat dissipation by the heat sink 12. Due to this effect, the magnetism is efficiently suppressed, and the risk of high temperature demagnetization of the permanent magnet 4 is eliminated.

Moreover, the annular yoke plate 3 contacts the magnetic pole piece 2 in its small-diameter annular region and contacts the permanent magnet 4 in its large-diameter annular region.
The magnetic resistance between the magnet 4 and the permanent magnet 4 is extremely small.

In addition, the left and right outer edges 15 and 16 of the heat sink 12 not only protrude into the forced air cooling air flow path and contribute to expanding the heat radiation area, but also increase the substantial heat capacity by being engaged with the shield case 19. Moreover, shield case 19
This has the practical effect of being locked to the frame-shaped yoke.

In the above embodiment, the first and second annular permanent magnets 4 and 7 were used, but the second annular permanent magnet I may be omitted, or a heat sink may be provided on the second annular permanent magnet I side. can be set up.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional view of a magnetron device in which the present invention is implemented, Fig. 2 is a partially broken perspective view of the first annular yoke plate of the same device, and Fig. 3 is a partially broken perspective view of the heat sink of the same device. FIG. DESCRIPTION OF SYMBOLS 1... Magnetron tube, 2... First magnetic pole piece, 3...
...first annular yoke plate, 4...first annular permanent magnet,
5... Second magnetic pole piece, 6... Second annular yoke plate, 8
... Frame-shaped yoke, 12... Heat sink.

Claims (1)

[Scope of utility model registration request] One magnetic pole of an annular permanent magnet stacked on the outer end surface of one magnetic pole piece of the magnetron tube via an annular yoke plate is magnetically coupled to the one magnetic pole piece, and the other magnetic pole of the permanent magnet is connected to the In a magnetron device that is magnetically coupled to the other magnetic pole piece of a magnetron tube via a frame-shaped yoke, the yoke plate has a small-diameter annular region that contacts the one magnetic pole piece without contacting the permanent magnet. , a large-diameter annular region connected to the outside of the same region via an inclined annular region, and the left and right outer edges of the heat sink, the central hole peripheral portion being sandwiched between the one magnetic pole piece and the large-diameter annular region; by bending it toward the permanent magnet side, and penetrating the tongue-like part at the edge through the bottom plate part of the frame-shaped yoke and the bottom plate part of the shield case superposed thereon, and bending or twisting it. A magnetron device characterized in that a shield case is locked to the frame-shaped yoke.