JPS5998439A - Direct advance beam type microwave tube - Google Patents

Abstract

PURPOSE:To couple high frequency section and collector section firmly and mechanically by placing a pair of metal interval holder and insulation spacer between high frequency section and flange of collector section while fixing the insulation spacer such that they can be replaced independently. CONSTITUTION:A sealing section 62 is formed between the bottom wall 63 of collector and an intermediate ring 63 on a tubular member 64 jointed air-tightly with first flange 34 then ceramic insulation rings 66, 67, 68 and thin metal rings 69, 70, 71, 72 such as Kovar are jointed air-tightly and the joints 73, 74 arc welded. The joint composed of these metal rings has flexibility to enable slight variation of gap (h). Metallic interval holders 81, 81,... and many insulation spacers 82, 82,... in pairs with said holders 81, 81,... and placed between the flange 61 are provided between both flanges 34, 61. Until completion of exhaustion, a metal spacer 86 having same thickness is placed in place of insulation spacer 82 and fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improvements in microwave tubes in which electron beams travel in a straight line, such as klystrons, traveling wave tubes, and gyrotrons.

[Background technology and its problems]

In the beam-straight microwave tube as described above, the high-frequency part that causes the electron beam to act on the high-frequency circuit and the collector electrode that collects the spent electron beam are electrically insulated and have different potentials between them. In some cases, the current flowing through both may be detected separately. For this reason, a structure is known in which an insulating cylinder such as a ceramic is hermetically sealed between the two. By the way, in a relatively small microwave tube, it is possible to assemble the high frequency part and the collector so that they are mutually mechanically supported by the airtight sealing part itself by the insulating tube, but the output is IMW (
In microwave tubes with extremely high power (megawatts) or more, the collector would be heavy, weighing more than 1 ton, making this impossible. Of course, the high frequency section also becomes heavy and the hermetic sealing section becomes easily damaged. Therefore, it has been considered to attach a pair of flanges to the high frequency section and the collector section, and to insert and fix a flange connecting member between the seven flanges for reinforcement. It is a good idea to use a metal such as iron for this connection member in order to obtain sufficient strength and from a cost perspective, so it is necessary to insert an insulating spacer to maintain electrical insulation between the high frequency section and the collector section. . In addition to ceramics, the insulating spacer is preferably made of hard resin such as Bakelite or epoxy, which is less likely to be damaged by force when tightened.However, materials with weak heat resistance are recommended. Under these conditions, the pipes cannot be vented, and if the insulation deteriorates due to surface contamination, the pipes become unusable.

[Purpose of the invention]

The present invention was developed in view of the above-mentioned circumstances, and it is possible to mechanically connect the high frequency section and the collector section firmly, and also to provide sufficient electrical insulation without any problem with exhaust etc. The present invention provides a straight-beam microwave tube that can be used.

[Summary of the invention]

In the present invention, a pair of flanges facing each other is provided in the high frequency part and the collector part, and a large number of sets of metal spacing bodies and insulating spacers are interposed between the two 7 flanges at intervals in a circular shape. Moreover, the insulating spacers are fixed so that they can be replaced independently. In addition, in order to facilitate this replacement, a flexible part is formed by an insulating airtight sealing part provided between both 7 lunges so that the interval between them can be partially varied.
This allows the insulator spacer to be replaced or a new one to be applied after the tube is evacuated.

[Embodiments of the invention]

The embodiment shown in FIGS. 1 to 4 has the following structure. That is, an outline of an example in which the present invention is implemented in a 1 megawatt (MW) class ultra-high power linear klystron device will be explained with reference to FIG. This klystron device consists of an electron gun section, a high frequency amplification section U, and an output waveguide section (L3).
, a tube body having a collector section I, and an insulating oil-filled tank (151
, a focusing magnet device (I
6) is combined with an evaporative cooling boiler Q7) attached to the collector turntable.

The electron gun part σB has a concave electron emitting cathode a81, the first
An anode, a second anode (201), vacuum tightness is maintained with insulating cylinders (21a) and (2xb), and a metal exhaust pipe (2) is provided at the lower end of the figure. , cathode terminal (to), CI!41, and second anode terminal (19a) i.These are placed in insulating oil in a tank and operated.High frequency amplification Part αa includes, from the upstream side of the electron beam, a first cavity (to), a second cavity (c), a third cavity (07), a fourth cavity (to), which are resonant cavities for high frequency long distances, The fifth cavity (a) and the sixth cavity (to) which is the output cavity are arranged in a column, and each of them is connected to a drift tube C.
31), 03η... Each cavity has a tuner (33,
(32) are provided, which extend parallel to the tube axis. Drive shaft (to).

The pole piece on the collecture side (34), i.e. g
It is driven by a driver 2 provided on the upper part of the flange 1 and a suitable gear mechanism. The first cavity (to) is provided with a variable manual high-frequency coupling section (2) whose coupling degree can be adjusted using a gear. The second cavity (a) is similarly provided with a variable high frequency coupling section, to which an external high frequency absorber (not shown) is connected. Note that a cathode-side pole piece (toward) is integrally connected to the second anode below the input cavity. The drift tube portion between the fourth cavity and the fifth cavity is provided with an axis adjustment device C3■ for finely adjusting the axes of each of the upper and lower cavities and the drift tube. and output cavity eO
) is coupled with a bent Taber waveguide (41), which passes through the collector side pole piece C34j and extends laterally from the space between this and the collector side 27th flange (6υ and the collector boiler). It is integrated with the output waveguide section α3) which has an extended and vacuum-tight inducer plate (41). Electromagnetic coil +43, (4
3) It has and is magnetically connected to both pole pieces. Note that the high frequency amplifying section σ2 is covered by a cylindrical cover (four forces), and a magnet device is disposed outside of the cylindrical cover.

The collector electrode of the collector portion (14) is a cylinder having a conical tip, and its outer circumferential surface is uneven.

The boiler αη surrounding this collector part has a water inlet (4
A drain port (46) is provided at the top, and a steam outlet (47) is formed in the ceiling. A drain pipe (c) is installed inside the drain port (46) so that the tip on the collector side is always filled with water to a predetermined height.
The open end is protruding. Note that each drift tube, each cavity outer wall, the collector bottom, the collector side pole piece portion, and the output waveguide portion are forced to be water-cooled.

Now, the high frequency amplification section (hereinafter referred to as the high frequency section) (hereinafter referred to as the high frequency section) (hereinafter referred to as the "high frequency section") includes a disc-shaped pole piece, i.e., the first 7 lunges, which are integrally fixed to the upper end portion of the ) are provided parallel to each other and facing each other.A second flange (b) is provided between the first flange (b) and the collector.
As shown in FIG. 3 and FIG. 3, an insulating hermetic sealing part trowel is provided. This sealing part is connected to the intermediate ring (65) on the cylindrical body that is hermetically sealed to the bottom wall t63) of the collector and the 17th flange 04) which also serves as the pole piece. Ceramic insulating rings (66), (6?), ([4, and thin metal rings such as Kovar (a), (70),
(71) and (72) are hermetically sealed, and their joints (7) and (74) are edge arc welded.
It becomes possible to slightly change h). Furthermore, inside this airtight sealing part is a triangular conductor plate (Phrase).

(76) are arranged alternately to form a high frequency choke. In addition, a cylindrical radio wave absorber (77) such as carbon ferrite is provided on the outer periphery of the elastic support (77).
Supported and fixed by 7υ. The elastic support (7) has the elasticity to press upward so that no gap is created between the radio wave absorber ση and the bottom wall of the collector even if the distance (h) is changed to some extent.

Therefore, the airtight sealing part (both flanges of the 6-sided mawashi (34
).

(A 7-lunge connecting member (801) is interposed between 58 and connects and fixes both 7-lunges. This connecting member (801)
) is the sealing part (6) excluding the output waveguide part (13).
A large number of metal spacing members (81), (8υ・) and a second
It has a large number of insulator spacers (821 degrees...) interposed between the flange 6υ.The spacer glue has an engineering shape and is made of iron.Insulator spacer bell 21
is made of ceramic or preferably a hard resin such as becrite or glass epoxy.

As mentioned above, these are fitted radially around the outer periphery of the sealing part (621) between the two bolts (84) through the insulating sleeve (&l), +83) for maintaining insulation.
, <g4) The gap holder (8υ and the second norange [F] are tightened and fixed.
1) and the 17th Lange (Foundation) are bolts (8■, C■・
・Fixed by n. In this way, each spacer and each insulating spacer are attached 9 so that they can be attached and detached independently. Note that these spacing members and insulating spacers are attached in a circle at intervals), and adjustment knobs (such as a rod and a connecting rod 61) for driving each tuner are attached between them.

Next, a preferred assembly procedure will be explained.

Until this klystron exhaust is completed, a metal spacer @b) (shown in the second figure) with the same thickness is inserted in place of the insulator spacer [F] that constitutes the connecting member, and the tightening is fixed and separated. , exhaust. Of course, the insulation sleeve (83 and 9
Not sure. As a result, these parts can also be heated to a sufficiently high temperature to vent gas from the parts inside the pipe and exhaust the gas. After completing the exhaust, remove the bolts one by one from the multiple sets of spacer retainers (8υ) and metal spacers (86), disassemble them, and remove the disassembled parts with a tool. Remove the metal spacer (80 mm) and replace it with a regular insulating spacer @bottle to slightly expand it locally using a Tighten again to fix. Do this for all sets to connect and fix both flanges. During this operation, the flexible part of the airtight seal section is That is, although the thin metal ring for sealing is slightly bent, it does not deform to the extent that the airtight joint is damaged.In this way, the structure of the flange connection member with the insulating spacer interposed is finally obtained.

Therefore, the high frequency section and the collector section are firmly connected and fixed by this flange connection member, and the entire weight of the high frequency section is not applied to the collector section b in the hermetically sealed section. Both are electrically insulated.

Furthermore, the above? When replacing the edge spacer, it is not necessary to remove it from the metal spacer (8υ is the first flange t34), and it is sufficient to replace only the insulator spacer. This eliminates undesirable power intensifiers that increase the number of parts and man-hours.

In addition, as each spacer until exhaustion is completed, a T-shaped member with a height corresponding to the distance between both flanges is used, and a spacer and an insulator spacer as shown in Fig. 4 are used. It is also possible to completely replace the metal spacer (2), which eliminates the need for the metal spacer (2) shown in FIG. Further, the shape of the spacer may be T-shaped or single-shaped, and furthermore, the shape and dimensions of the spacer including the insulating spacer can be modified. Furthermore, as the insulator spacer, it is more preferable to use a hard resin insulator, which is less likely to cause cracks when tightened and is inexpensive.

〔Effect of the invention〕

By having the above-described configuration, the present invention allows all insulator spacers to be easily replaced with those to be ultimately used.
Electrical insulation can be reliably obtained and the high frequency section and the collector section can be mechanically firmly fixed. Therefore, it is particularly effective for use in heavy microwave tubes.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical sectional view showing an embodiment of the present invention, Fig. 2 is a half sectional view showing the main part thereof, Fig. 3 is an enlarged view of the main part, and Fig. 4 is a partial perspective view thereof. High frequency part, (141 collector part, 17th lunge (pole piece), (611 2nd lunge,
[F]2 Insulating airtight sealing part, (801/7 lunge connection, harrow member, [F]υ... spacing body, (8 insulator spacer. Agent: Kensuke Chika, patent attorney rule) (and 1 other person) )Figure 8Figure 4

Claims (3)

[Claims] (1) A first seven flange integrally provided at the end of the high-frequency section through which the electron beam travels straight to support the high-frequency section, and a first 7-lunge provided in close proximity to the high-frequency section for the electron beam after use. an insulating airtight sealing part that electrically insulates these high frequency parts and the collector and joins them in a vacuum-tight manner, and is provided opposite to the seventeenth flange and is integrally attached to the collector. and a second 7-flange for supporting the collector, and a 7-lange connecting member that connects the first and second flanges to each other and is provided so as to extend around the outer periphery of the insulating airtight sealing portion. In the beam straight microwave tube, the seven flange connecting members include a plurality of metal spacing bodies arranged at intervals in a circle, and each of the spacing bodies and any one of the seven flange connecting members. 1. A straight beam type microwave tube comprising a plurality of insulating spacers interposed between the tube and the tube, each of the insulating spacers being fixed so as to be independently replaceable. (2) The beam rectilinear microwave according to claim 1, wherein the insulating hermetic sealing part has a flexible part that can vary the mutual spacing between the first valve and the second seven flange by a small amount. tube. (3) The beam straight microwave tube according to claim 1, wherein the insulating spacer is formed of hard resin.