JPS6337539A - Tuning mechanism for klystron - Google Patents

Abstract

PURPOSE:To aim at the acquisition of multiple setting frequencies, by constituting a projected part of a preset part with a set of projecting part set up along a drift shaft axis of a cavity resonator and at least more one set of projecting parts set up in the position where the set projecting parts are parallelly moved in the orthogonal direction with the drift shaft axis. CONSTITUTION:A tuning mechanism 23 being connected to a tuner 22 for altering resonance frequency of a cavity resonator 22 is constituted of a tuner support mechanism 25, giving the tuner 22 with force in the reverse direction to atmospheric pressure by restoring force of a spring 24 at all times, a preset part 29 having a device parallelly moving a rack 27, where plural sets of frequency setting screws 26 are attached, by rotating a pinion 28 and a driving mechanism 31 performing connection and separation of the frequency setting screw 26 and a tuner shaft 30. With this constitution, operating frequency of a klystron comes high whereby even in case a distance between cavities becomes shortened, multiple preset frequencies are securable.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in the tuning mechanism of klystrons.

[Conventional technology]

The talistron consists of an electron gun that emits and forms an electron beam, a high-frequency circuit that interacts high-frequency power with the electron beam, a collector that captures electrons, and a focusing device that focuses the electron beam. Among these, the high frequency circuit is composed of a cavity resonator body, a tuning mechanism for changing the resonance frequency of the cavity resonator, and a tuning mechanism connected to and supporting this tuning.

By the way, when changing the frequency of the high-frequency power to be amplified,
With klystrons, it is necessary to adjust the resonant frequencies of multiple cavity resonators to appropriate values while observing the output waveform each time, which makes handling and operation more inconvenient than traveling wave tubes. In order to eliminate this operational inconvenience, we have developed a tuning mechanism that has a brisset-soto mechanism that allows you to easily obtain the specified bandwidth without any adjustment by simply performing a frequency switching operation at a specific preset frequency. The equipped klystron is used. A conventional klystron equipped with such a preset function had a structure as shown in FIG. In Fig. 3, the klystron high-frequency circuit consists of a cavity resonator 1, a tuner 2 that changes the resonance frequency by changing the volume of the cavity resonator 1, and a tuner 2 and the cavity resonator 2 that change the resonance frequency by changing the volume of the cavity resonator 1. 1 and a bellows 3 which maintains the vacuum of the klystron and enables the synchronizer 2 to be moved in and out through mechanical deformation. Further, the tuning mechanism 4 is
A tuning support mechanism 5 connected to the tuning 2 and always applying a force in a fixed direction to the tuning 2 along the axis of the tuning 2, and a preset fixed to the high frequency circuit section via a support 6. It consists of section 7. The preset part 7 is a fixed plate 8
, a gear 9 fixed to the fixed plate 8, and a plurality of frequency setting screws 10 attached to the gear 9.

FIG. 4 shows a detailed plan view of the frequency setting screw 1o and the gear 9. In the figure, the gear 9 is arranged so that the frequency setting screw 10.11 is located corresponding to the center distance dimension A of the synchronizer 2. Further, a driving gear 14 is provided for rotating the frequency changing shaft 12 protruding from the fixed plate 8 and positioning the other frequency setting screw 13 at the center axis of the synchronizer 2.

According to this structure, the resonant frequency of the cavity resonator 1 is uniquely determined by the position within the cavity resonator of the tuning 2 forming a part of the metal wall of the cavity resonator 1, and The presetting operation for presetting the prescribed bandwidth of is performed as follows. First, in the condition shown in Figure 3, set the frequency setting screw 10.11 so that the bandwidth can be obtained at the specified frequency.
The fixing plate 8 is adjusted via the bearing 15.
The locking shaft 16 fixed to is rotated to move the movable plate 17 until it touches the unlock plate 18.

At this time, tuner shaft 19 connected to tuner 2
moves to the cavity resonator 1 side, so the tuner shaft 1
The contact between the two and the frequency setting screw 10 is disconnected. In this state, the frequency changing shaft 12 is rotated to a position where the other frequency setting screw 13 coincides with the center axis of the tuner shaft 19. At this position, the locking shaft 16 is rotated again to move the movable plate 17 until it touches the lock plate 20. In this state, the degree of screwing of the frequency setting screw is adjusted so that a specified band characteristic is obtained at a frequency different from the above-mentioned operating frequency. By repeating this adjustment, many operating frequencies of the klystron can be set in advance. To change the frequency of a tuning mechanism with a preset function set by the above adjustment, move the movable plate until it hits the unlock plate, and align the frequency setting screw set to another operating frequency with the central axis of the tuner shaft. This can be easily done by aligning the movable plate with the lock plate and then placing the movable plate against the lock plate again.

[Problem that the invention seeks to solve]

However, the above-mentioned conventional tuning mechanism has the disadvantage that the number of internal threads that can be provided on a given circumference is limited due to the use of external gears, which limits the number of settings for the klystron operating frequency. Ta. In particular, as the operating frequency of the klystron increases, the dimensions of the high-frequency circuit section (dimension A) in Figure 3 inevitably become smaller, so it is necessary to reduce the outer diameter of the external gear, and this drawback becomes especially serious. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a tuning mechanism for a klystron that eliminates such conventional drawbacks and allows a large number of set frequencies to be obtained even when the operating frequency of the klystron increases.

[Means for solving problems]

The present invention has a tuning support mechanism that is connected to a tuning part that forms part of a klystron cavity resonator and constantly applies a force in the opposite direction to atmospheric pressure to the tuning part, and a plurality of convex parts. and a preset part that contacts and mechanically displaces at least a part of the tuning support mechanism to which the convex part is connected to the tuner, and a tuner to which the tuner is connected to the convex part of the preset part. In a klystron tuning mechanism consisting of a drive mechanism having a means for connecting and disconnecting a part of the support mechanism, the convex part of the preset part is arranged along the drift tube axis of the cavity resonator. the convex portion of the set, and at least another one disposed at a position parallel to the drift tube axis in a direction perpendicular to the drift tube axis.
It is characterized by being composed of a set of convex portions.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of a tuning mechanism according to an embodiment of the present invention.

Tuning 22 for changing the resonant frequency of the cavity resonator 21
The tuning mechanism 23 connected to the tuning mechanism 22 has a spring 24 connected to the tuning mechanism 22.
It has a tuning support mechanism 25 that always applies a force in the opposite direction to the atmospheric pressure due to the restoring force of It is comprised of a preset section 29 and a drive mechanism 31 that connects and disconnects the frequency setting screw 26 and tuner shaft 30.

FIG. 2 shows a detailed view of the rack 27, pinion 28, and frequency setting screws 26 of the preset section.As shown in FIG. 0, the required number of frequency setting screws 26 are arranged horizontally on the rack 27. In this tuning mechanism, nine frequency changes can be made by rotating the pinion 28, which allows presetting operation of one operating frequency of the klystron by a set of frequency setting screws arranged along the dot tube axis of the cavity resonator. This is done by moving the rack 27 laterally to align the other set of frequency setting screws with the center axis of the tuner shaft. According to this structure, the number of operating frequencies of the klystron that can be set in advance can be set to an arbitrary number by increasing the width of the rack, and the structure of the processor section can also be simplified. In the above embodiment, a case has been described in which a screw is used as the frequency setting convex part for pushing the tuner shaft, but other convex members may be used instead of the screw.

〔Effect of the invention〕

As is clear from the above explanation, the tuning mechanism of the present invention has a structure in which a plurality of sets of convex portions that displace the tuning of the preset portion are arranged in parallel movement in the lateral direction, so that the operating frequency of the klystron is A large number of preset frequencies can be obtained even when the distance between the cavities becomes high and the distance between the cavities becomes short.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a tuning mechanism for a klystron according to the present invention;
2 is a detailed view of the preset section shown in FIG. 1, FIG. 3 is a sectional view of a conventional klystron tuning mechanism, and FIG. 4 is a detailed view of the preset section shown in FIG. 3. 1.21...Cavity resonator, 2,22...Synchronized, 4
．． 23... Tuning mechanism, 5.25... Tuning support mechanism, 7.29... Preset section, 9... Gear, 10°11.13.26... Frequency setting screw, 27...・U・7ri, 28...Pinion, 30...Tuner shaft.

Claims (1)

[Claims] A tuning support mechanism that is connected to the tuning which forms part of the klystron cavity resonator and always applies a force in the opposite direction to atmospheric pressure to the tuning, and a tuning support mechanism that has a plurality of convex parts and the raised parts. a preset portion that contacts and mechanically displaces at least a portion of the support mechanism that is connected to the tuner, and a part of the support mechanism that the convex portion of the preset portion and the tuner are connected to. In a klystron tuning mechanism comprising a drive mechanism having means for connecting and disconnecting, the convex portion of the preset portion includes a pair of convex portions arranged along the drift tube axis of the cavity resonator; A tuning mechanism for a klystron, characterized in that the one set of convex parts is further comprised of at least one set of convex parts disposed at a position parallel to the drift tube axis in a direction perpendicular to the drift tube axis.