JPH0448614Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to high-frequency electron tubes, and particularly relates to improvements in corona rings for preventing discharge.

(Prior Art) High-frequency electron tubes such as high-power transmitting tubes, klystrons, magnetrons, traveling wave tubes, and gyrrotrons have airtight joints between electrode support members and insulating tubes such as ceramics in their electron gun sections and cathode support sections. In order to protect this joint from high-voltage discharge and high-frequency discharge, it has a structure in which it is covered with a discharge-preventing conductor ring called a corona ring to provide electrical shielding.

(Problem that the invention aims to solve) By the way, if the diameter of the corona ring is relatively small or if it can be assembled as a single part, it is possible to mold the corona ring into the most effective shape for preventing electrical discharge. However, in recent years, these high-frequency electron tubes have become more and more ultra-high-power, and as a result, they have become larger, so the diameter of the corona ring has become more than ten centimeters, and the corona ring has been installed in several places. If it is necessary to attach a ring, the structure may be such that it cannot be attached as a single component. In such a case, it is necessary to prepare the corona ring in advance by dividing it into two or several parts in the circumferential direction, and then to assemble them into one piece. In a structure in which pre-divided corona rings are integrally assembled and mounted at required locations, it is necessary to prevent protrusions from forming at the abutting portions of the end faces of the plurality of corona ring components. However, even when assembled with great care, the electric field tends to concentrate near the end face, causing discharge. Further, the abutting end faces are likely to be misaligned, making assembly difficult, and even if there is a slight misalignment, discharge is likely to occur there as well.

This invention eliminates the above-mentioned disadvantages and facilitates alignment at the end butt joints of the divided corona rings, and also creates a structure that alleviates or eliminates the concentration of electric fields and effectively prevents discharge. It provides a high frequency electron tube.

[Structure of the invention] (Means for solving the problem) This invention includes a corona ring made of a conductive material and divided into at least two parts for preventing discharge, which is attached to cover the joint between the electrode support member and the insulator. , a conductive connecting body having a spherical bulge that bulges out slightly more outward than the abutting end faces of the corona ring is interposed between the joint parts of the divided parts and are integrally connected. It is an electron tube.

(Function) According to this invention, the corona ring is integrally connected by interposing the conductor connector at the abutting portions of the end portions of the corona ring parts that are divided in advance, so that the end faces of the mating portions can be accurately connected to each other. In addition, due to the spherical bulge slightly bulging outward from the abutting end faces, the electric field is not concentrated on the end faces, and discharge is suppressed.

(Example) An example will be described below with reference to the drawings. Note that the same parts are represented by the same symbols.

Figure 1 shows an example in which this idea is applied to the electron gun assembly of an ultra-high power klystron. In the same figure,
11 is an electron emission cathode, 12 is a Wehnelt electrode, 13 is a beam acceleration electrode, 14 is a body electrode, 15 is a pole piece, 16 and 17 are ceramic insulating cylinders 18 are acceleration electrode support members, 19 is a cathode support member, 20 is a cathode support cylinder, 21 is a heater electrode terminal, 22, 23, 24, 25 are thin sealing rings for airtightly connecting each electrode support member and the insulating cylinder, 26, 27 are inner tube corona rings, and 28, 29 , 30, and 31 each represent a corona ring made of a conductive material for preventing discharge and covering the air-tight solder joint and the sealing ring on the outside air side.

Therefore, these corona rings 28, 29, 30,
31 is a part divided into two in the circumferential direction,
A conductor connector 3, which will be described later, is attached to each end abutting part.
2, 33, 34, and 35 are interposed and integrally connected.

Taking one of the corona rings 28 on the outside air side as an example, as shown in FIG. 2, it consists of corona ring parts 28a and 28b that are divided into two in the circumferential direction. Each corona ring part 28a, 28
b is made of, for example, a stainless steel plate, and its cross section is bent into a substantially S-shape as shown in FIG. On the other hand, the conductor connectors 32, 32 have a bulge portion 32a that bulges outward in a spherical shape in the middle portion, and is tightly fitted inside the butting end portion of the corona ring 28 on both sides of the bulge portion 32a. It has a fitting portion 32b having a size that fits the fitting portion and a predetermined length along the circumferential direction.
This is also formed by pressing a stainless steel plate, and two pieces are prepared.

As shown in FIG. 6, this is interposed inside the abutting connection portion 28c of both end faces of the divided corona ring parts 28a and 28b, and is fixed by soldering or the like, thereby integrally connecting the corona rings.
That is, the fitting part 32b of the connecting body 32 is tightly fitted inside the end of each corona ring component, and the bulging part 32a
are integrally connected so that they bulge outward from between both end faces. As a result, the end face of each corona ring component is electrically shielded by the bulge of the connecting body, and the concentration of electric field thereon is alleviated or eliminated. It goes without saying that the corona ring may be divided into several parts and combined if necessary, and a connecting body may be interposed at the joining portion thereof.

In the embodiment shown in FIG. 7, the connecting body 32 is made of a block-shaped conductor. Further, in the embodiment shown in FIG. 8, the connecting body 32 is disc-shaped.
This connecting body 32 has concave portions 3 in which bulging portions 32a on both sides position and fit each corona ring component.
It also constitutes 2c.

[Effects of the invention] As explained above, according to this invention, it is possible to accurately align the ends of the pre-divided corona ring, and the spherical shape slightly bulges outward from the end face of this corona ring component. The electric field does not concentrate on the butt end faces due to the bulge, and discharge is suppressed.

[Brief explanation of the drawing]

Figure 1 is a half-longitudinal cross-sectional view showing one embodiment of this invention, Figure 2 is a top view showing its parts, and Figures 3 and 4 are cross-sectional views at 3-3 and 4-4 in Figure 2, respectively. 5 is a perspective view of the connecting body, FIG. 6 is a top view of the main part in an assembled state, and FIGS. 7 and 8 are sectional views of the main part showing other embodiments of this invention. 18, 19... Electrode support member, 16, 17...
Insulating cylinder, 28, 29, 30, 31...corona ring, 28a, 28b...divided corona ring parts,
28c...Butt connection part, 32...Connection body, 3
2a...Bulging part, 32b, 32c...Fitting part.

Claims (1)

[Claims for Utility Model Registration] A high-frequency electron tube comprising a corona ring made of a conductor for preventing discharge and divided into at least two parts so as to cover the joint between an electrode support member and an insulator, the corona ring comprising: A connecting body made of a conductor having a spherical bulge that bulges outward from the abutting end surfaces of the corona ring is interposed between the mating portions of the divided portions and are integrally connected. high frequency electron tube.