JPS61214328A - Magnetron anode structure - Google Patents

Abstract

PURPOSE:To increase the dimensional accuracy of a magnetron anode structure and facilitate its assembly by using strap rings having the same or similar shapes to connect an even number of vanes installed in an anode cylinder constituting a resonant cavity. CONSTITUTION:A magnetron anode structure 1 is constituted of an anode cylinder 1a constituting a resonant cavity, an even number of vanes 21 radially arranged inside the cylinder 1a and two strap rings 40 for connecting the vanes 21. During assembly of the magnetron anode structure 1, strap rings 31 and 41 are compulsorily pressed into the groove 21a of the vane 21 at a given interval. By the means mentioned above, the magnetron anode structure 1 can be produced by making the positions of a few strap rings having the same or similar shapes different. Consequently, it is possible to increase the thermal stress resistance of the magnetron anode structure 1 and to facilitate its assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetron anode thin body in which a plurality of strap rings combined have the same or almost the same shape.

[Background of the invention]

As shown in the cross-sectional view, strap rings 3 and 4 electrically connect every other vane to an even number of vanes arranged radially from the cylindrical portion 1a of the anode 10 toward the center of the cylinder.

The manufacturing method of the anode 1 is to hob a billet of R-free bare copper, integrally mold the round part 1a and the vane 2, and after death fill 1cJJt of fat etc. between each vane 2 and process it with a lathe to form the shape shown in Fig. 1(b). 42a whose cross section is generally rectangular as shown in )
are provided at the upper and lower ends of the cylinder in the axial direction. After such finishing processing, 48 fat is removed.

On the other hand, the inner strap rings 3 and 4 are made by press punching from oxygen-free steel plates, etc., and have different diameters.
and mold the outer strap ring 4. These strap rings 3.4 are then plated with silver, and the protrusions 3a, 4a of the strap rings 3, 4 are driven into the base 2a of the vane 2 with a slight interference, or with a slight fit (
The inner strap ring 3 is caulked with a taper punch 10 indicated by a dotted line from the direction of arrow C, and the outer strap ring 4 is caulked from the direction of arrow C' with a wedge punch 11 indicated by a dotted line. Place it in a furnace to form silver solder between the silver plating layer and the steel material to securely solder and secure it.

Further, FIG. 2 shows a so-called brazing type magnetron anode structure in which the cylinder 1a and the vane 20 are separated and brazed using an assembly jig (not shown).

In this anode structure, as is clear from the illustration, the strap rings 30, 40 have protrusions 3a as shown in FIG.

4a is not necessary, but as shown in Fig. jg2 (b), groove 2
With respect to 0a, it is necessary to change the one to which the inner strap ring 30 is connected and the one to which the outer strap ring 40 is connected due to the difference in diameter.

The oscillation frequency of the magnetron with these anode structures is determined by the capacitance and inductance formed by the vanes, the strap rings 3, 30, 4° 40 and @2a, 20
The capacitance formed by a and the capacitance formed by strap rings function as the main elements and are determined, and the fine adjustment of the oscillation frequency is performed by strap rings 3, 30, 4.
and f: Ij 2 a.

The capacitance with 20a is determined by changing the distance between them. Therefore, when correcting the deviation from the frequency that should be set with the assembled anode beak, the opposing area between @2a, 20a and the strap rings 3, 30, 4.40 is smaller than the opposing area between the strap rings. Therefore, it becomes necessary to take a large amount of deformation of the strap ring for correction. This increases the potential for abnormal approaches during correction.

In addition, during operation as the magnetron turns on and off, the strain caused by the strap ring expanding and the vane protruding in the direction of the central axis causes stress on the outer strap ring with a large diameter as well as on the inner strap ring with a small diameter. The strap ring is larger because the distance between its connection points is smaller, and the inner strap ring is more likely to be damaged during a magnetron life test.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetron anode structure in which a plurality of strap rings have the same ring portion dimensions, thereby improving ease of assembly and reliability.

[Summary of the invention]

A plurality of conventional strap rings constituting the anode of a magnetron have different diameters on the inside and outside of the mounting groove. The present invention enables a plurality of strap rings to have the same diameter by changing the arrangement direction of the strap rings, thereby improving assembly efficiency and reliability in the manufacturing process.

[Embodiments of the invention]

In Figure 8g3 (a), the plane in one embodiment of the present invention is (
b) shows a sectional view taken along line c-c' in (a). 31 is an inner strap ring according to the present invention, 4 IFi is an outer strap ring according to the present invention, and other symbols are the same as in the conventional case. Here, in the anode structure shown in FIG. 3, the dimensional relationship between the strap ring 31.41 and the tile 21a of the vane 21 is a combination with a slight caulking allowance.
Inner strap ring 31 on the brim 21a. Subsequently, g21a may have a simple rectangular shape since it is assembled with the outer strap ring 41 by forced press-fitting.

FIG. 4 is a diagram showing another embodiment of the present invention. @Figure 4 (
In the anode structure shown in b), the vane groove 22a and the strap rings 32, 42 are in a dimensional relationship with a slight fitting allowance (gap), respectively, and a small step is provided on the direction 22a for assembly. In this case, the inner strap ring 32 and the outer strap ring 42 can be caulked at the same time by pressing the vane 22 from the direction of the arrow C with a taper punch lO shown by a dotted line.

That is, in the case of the embodiment shown in FIG. 3, the inner strap ring 31 and the outer strap ring 41 can have exactly the same dimensions, and in the embodiment shown in FIG.
Although the width dimension of the fitting portion to 22a is slightly different in some parts, the ring portion of the strap ring can be the same as the inner and outer strap ring portions, so the operation of the magnetron described above is performed in the same manner as in the embodiment shown in Fig. 3. The stress generated on the strand ring is the same, and the inner strand ring no longer has a short life as in the past. Moreover, the cross-sectional shape of the ring part of the strap ring is larger in the axial direction than in the conventional strap ring, whereas the axial thickness is larger in the strap ring of the present invention. Since the strap ring is made smaller, the rigidity of the strap ring against thermal stress can be significantly increased.

Furthermore, in the strap ring of the present invention, since the relative area between the inner and outer strap rings is large, the capacitance thereof is larger than the capacitance formed next to the strap ring.
The oscillation frequency can be easily adjusted by moving only the outer strap rings 40° and 41 in the axial direction.Also, since the strap ring according to the present invention is formed by stamping a plate material, it can easily achieve high precision compared to conventional methods. You can get the following.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to obtain a strap ring that is resistant to thermal stress generated by magnetron operation, has high reliability, has high processing accuracy, and is easy to assemble.

[Brief explanation of drawings]

Figure 1 (a) is a plan view of a conventional magnetron anode, (b) is a sectional view taken along line A-A' in taJ, and Figure 2 (a) is a plan view of a conventional magnetron anode.
) is a plan view of another example of a conventional magnetron anode structure, (
b) is a sectional view taken along line BB' in (a), (a) in FIG. 3 is a plan view of a simple embodiment of the present invention, and (b) is c-c' in (a).
A line sectional view, FIG. 4(a) is a plan view of another embodiment of the present invention, and FIG. 4(b) is a diagram showing a DD'/1i!+! cross-sectional view in (al). ... Anode, 1a... Cylindrical part, 2, 20.21
．． 22...Bane s 2a, 20a, 21a, 22
a-groove, 3.30, 31.32...inner strap ring, 4.40.41.42...outer strap ring. Figure 1 (^) Figure 2 (b) Figure 3 (cL) (b) Figure 4 C9ji

Claims (1)

[Claims] An anode cylinder constituting a cavity resonator and an even number of vanes arranged radially inside the anode cylinder, a groove having a generally rectangular cross section in a part of the end of the vane in the axial direction of the cylinder; A magnetron anode structure in which strap rings electrically connected in the groove are arranged every other time, wherein the strap rings are stacked at a predetermined interval in the cylindrical axis direction.