JPH01320733A - Collector structure of microwave tube - Google Patents

Abstract

PURPOSE:To improve mechanical strength and heat radiation property by fixing each collector electrode each independently to a split vacuum housing part through an insulation spacer. CONSTITUTION:Plural collector electrodes 12-15 are stacked in split vacuum housings 17-20 through insulation spacers 16 along a tube axis, and the peripheral thin part 19a is joined air-tightly by heliarc welding, and a multistep type collector electrode structure being cylindrical as a whole is formed. According to the constitution like this, each electrode 12-15 is fixed each independently to the housing 17-20 through the spacer 16, therefore a structure easy in assembling and high in mechanical strength can be obtained. Also, thereby it can relatively shorten the heat transmission path from each collector electrode to the vacuum housing as well and improve heat radiation property.

Description

Detailed Description of the Invention [Invention 1] (Industrial Application Field) The present invention relates to a collector structure of a microwave tube such as a traveling wave tube, and particularly relates to a collector structure of a microwave tube such as a traveling wave tube, and particularly a multi-stage collector structure of a two-stage or more type. The present invention relates to a collector structure having a collector electrode.

(Prior Art) Generally, a beam-travel type microwave tube such as a traveling wave tube or a klystron has an electron gun section, a high frequency acting section, a collector section, and an electron beam focusing magnetic field device. Devices using such microwave tubes use multi-stage collector electrodes with two or more stages in order to improve power conversion efficiency.
In some cases, each collector electrode is operated at a lower potential than the high-frequency acting part, that is, the body part, to reduce power consumption in the collector part. In that case, each collector electrode is stacked and assembled with an insulating support inside a bottomed cylindrical vacuum envelope, as disclosed in, for example, Japanese Utility Model Application Publication No. 12-153750.

(Problem to be Solved by the Invention) According to the conventional structure as disclosed in the above-mentioned publication, each collector electrode is held in the vacuum envelope via many mechanical connections, so the mechanical There are disadvantages in that sufficient strength is not obtained, and the heat conduction path from each collector electrode to the vacuum envelope is long, making it difficult to obtain a sufficient heat dissipation effect.

The present invention provides a collector structure for a microwave tube that can eliminate the above-mentioned disadvantages, increase the mechanical holding strength of a plurality of collector electrodes, and improve thermal conductivity from the collector electrodes to the vacuum envelope. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) The present invention is characterized in that a vacuum envelope surrounding a plurality of collector electrodes is divided into a plurality of parts corresponding to each collector electrode, and This is a collector structure for a microwave tube, which is held through an insulating spacer and integrally hermetically sealed at a divided portion.

(Function) According to the present invention, each collector electrode is independently mechanically fixed to the divided vacuum envelope portion by soldering or the like via an insulating spacer, so assembly is easy and the mechanical holding strength is high. expensive. Moreover, thereby, the heat conduction path from each collector electrode to the vacuum envelope can be made relatively short, and heat dissipation performance is improved. In this way, a highly reliable collector structure can be obtained.

(Example) Examples thereof will be described below with reference to the drawings.

Identical parts are designated by the same reference numerals.

FIG. 1 shows a collector structure including four stages of collector electrodes of a traveling wave tube in a completely assembled state. In the same figure, reference numeral 11 is a part of the high-frequency action section consisting of a slow wave circuit, 12 is the first collector electrode closest to the upstream side of the electron beam, 12a is the beam passage hole, 13 is the second collector electrode immediately downstream, 1
3a is the beam passing hole, 14 is the third collector electrode immediately downstream thereof, 14a is the beam passing hole, 15 is the fourth collector electrode most downstream, 15a is the beam passing hole, 15
b is the bottom of the electrode, 16.16... is an insulating spacer made of ceramic with good thermal conductivity, 17.18.1
9.20 is a ring-shaped divided vacuum envelope that surrounds and holds the corresponding first to fourth collector electrodes; 21.22;
．． 23 is the hermetic welding part of these, 24 is the bottom plate of the vacuum envelope, 25 is the metal exhaust pipe fixed to it, 26, 26 is the collector electrode lead, 27, 27... is the insulating tube for drawing out these leads. It's raining.

FIGS. 2 to 4 representatively show the assembly structure of the third electrode portion. Four insulating spacers 16 are arranged on the flat outer peripheral portion 14b of the flange portion of the collector electrode 14. These insulating spacers 16 are made of beryllia ceramics having a roughly dice shape, and have a through hole 18 (l) along the axial direction. Metallized layers 16b and 16c of brazing agent are applied to the arc-shaped outer surface, respectively.The metal ring-shaped divided vacuum envelope 19 has circumferential grooves on the outer circumferential surface of both upper and lower ends. As a result, thin-walled parts 19a for welding are formed respectively. Also, a step part 19b is formed on a part of the inner periphery.These parts are assembled by soldering as shown in the figure.In other words, the lead The horizontal lead 2[ia relayed to the wire 26 is inserted into a hole 14b formed in a part of the outer periphery of the cylindrical collector electrode 14 and soldered. The outer surface of each spacer is engaged and soldered to the step IBa on the side surface, and the outer surface of each spacer is engaged and fixed by soldering to the inner step 19b of the ring-shaped divided vacuum envelope.The lead wire 2G is , is extended along the axial direction through the through hole 18d of a predetermined spacer.

In this way, each collector electrode is brazed and fixed to the divided vacuum envelope via an insulating spacer, and they are stacked one after another in the axial direction, and the thin walled part 19a on the outer periphery is hermetically joined by edge arc welding, and the whole A cylindrical multi-stage collector electrode structure is completed. Finally, it is connected to the high frequency acting section.

Note that the example described below has four collector electrodes, but this is not limited to this, and a configuration in which two or more collector electrodes are assembled electrically insulated from the vacuum envelope may also be used. Applicable to. This is particularly advantageous when applied to devices having three or more stages of collector electrodes, which would be complicated to assemble.

[Effects of the Invention] As explained above, according to the present invention, each collector electrode is independently fixed to the divided vacuum envelope portion via an insulating spacer, which facilitates assembly and improves mechanical holding strength. A high structure can be obtained. In particular, even when there are many collector electrodes of three or more stages, a structure that is easy to assemble and has high reliability can be obtained. Therefore, it is suitable for things that require mechanical earthquake resistance, such as microwave tubes mounted on artificial satellites.It also allows the heat conduction path from each collector electrode to the vacuum envelope to be relatively short. , heat dissipation is improved.In this way, a highly reliable multi-stage collector structure can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a partially exploded sectional view thereof, FIG. 3 is an assembled vertical sectional view, and FIG.
The figure is a cross-sectional view of the earthen tank at 4-4 in FIG. 12.13.14.15... Collector electrode, 16...
- Insulating spacer, 17.18.19.20... Divided vacuum envelope, 21.22.23... Airtight joint. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 4

Claims (1)

[Scope of Claims] A collector structure for a microwave tube in which a plurality of collector electrodes are electrically insulated by insulating spacers and fixed in a vacuum envelope at predetermined intervals along the tube axis, comprising: The vacuum envelope is divided into a plurality of parts corresponding to each collector electrode, holds the corresponding collector electrode via the insulating spacer, and is integrally hermetically sealed at the divided part. Collector structure of microwave tube.