JPH0578891B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in the tuning mechanism of klystrons.

[Conventional technology]

A klystron consists of an electron iron that emits and forms an electron beam, a high-frequency circuit that interacts high-frequency power with the electron beam, a collector that captures the 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, in klystrons, it is necessary to adjust the resonant frequencies of multiple cavity resonators to an appropriate value while observing the output waveform each time, and it is difficult to handle compared to traveling wave tubes. There were some inconveniences in operation. In order to eliminate this operational inconvenience, the system is equipped with a tuning mechanism that has a preset mechanism that allows you to easily obtain a specified bandwidth without any adjustment work by simply performing a frequency switching operation at a preset specific frequency. 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 that is connected to the klystron and allows the synchronizer 2 to be moved in and out through mechanical deformation while maintaining the vacuum of the klystron. The tuning mechanism 4 also includes a tuning support mechanism 5 that is connected to the tuning 2 and always applies a force in a fixed direction along the axis of the tuning 2 to the tuning 2, and a support 6 in the high frequency circuit section. The preset portion 7 is fixed through the preset portion 7. The preset section 7 consists of a fixing plate 8, a gear 9 fixed to the fixing 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 10 and the gear 9. In the figure, the gear 9 has frequency setting screws 10 and 1 corresponding to the center distance dimension A of the synchronizer 2.
1 is located. Further, a driving gear 14 is provided for rotating the frequency changing shaft 12 protruding from the fixed plate 8 and positioning another frequency setting screw 13 at the center axis of the tuning 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, The preset operation for presetting the specified bandwidth of the Chrysrolon is performed as follows. First, in the state shown in FIG. 3, the frequency setting screws 10 and 11 are adjusted so that a bandwidth is obtained at a specified frequency. Next, the locking shaft 16 fixed to the fixed plate 8 via the bearing 15 is rotated to move the movable plate 17 until it touches the unlocking plate 18. At this time, the tuner shaft 19 connected to the tuner 2 moves toward the cavity resonator 1, so that the tuner shaft 19 and the frequency setting screw 10 are no longer in contact with each other. In this state, the frequency changing shaft 12 is rotated to a position where the other frequency setting screw 13 coincides with the central 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 locking 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 the tuning mechanism with the preset function set by the above adjustment, move the movable plate until it touches the unlocking plate and align it with the center axis of the frequency setting screw tuner shaft that is set to another operating frequency. This can be easily done by aligning the movable plate to the desired position and then placing the movable plate against the lock plate again.

[Problem that the invention seeks to solve]

However, in the conventional tuning mechanism described above,
Since the external gear is used, the number of internal threads that can be provided on a given circumference is limited, which limits the number of klystron operating frequencies that can be set. In particular, as the operating frequency of the klystron increases, the dimensions of the high-frequency circuit section (dimension A in FIG. 3) inevitably become smaller, so it is necessary to reduce the outer diameter of the external gear, and this drawback becomes particularly noticeable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tuning mechanism for a klystron that can eliminate such conventional drawbacks and obtain a large number of set frequencies even when the operating frequency of the klystron becomes higher.

[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. a preset portion that contacts and mechanically displaces at least a portion of the tuning support mechanism to which the convex portion is connected to the tuner; and a tuning support to which the convex portion of the preset portion and the tuner are connected. In a klystron tuning mechanism comprising a drive mechanism having a means for connecting and disconnecting a part of the mechanism, a convex part of a preset part is arranged in one set along the drift tube axis of a cavity resonator. a convex part,
It is characterized by comprising at least one other set of convex portions disposed at a position parallel to the drift tube axis in a direction perpendicular to the drift tube axis.

〔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. A tuning mechanism 23 connected to the tuning 22 for changing the resonant frequency of the cavity resonator 21 includes:
The tuning support mechanism 25 always applies a force in the opposite direction to atmospheric pressure to the tuning 22 by the restoring force of the spring 24
, a preset section 29 having means for rotating a pinion 28 and moving the rack 27 in parallel to which a plurality of sets of frequency setting screws 26 are attached; and a drive mechanism 31 for connecting and disconnecting the frequency setting screws 26 and the tuner shaft 30. It is made up of.

FIG. 2 shows a detailed view of the rack 27, pinion 28 and frequency setting screw 26 of the preset section. As shown in the figure, the required number of frequency setting screws 26 are arranged horizontally on a rack 27. This tuning mechanism allows presetting of one operating frequency of the klystron by a set of frequency setting screws located along the dot tube axis of the cavity. Frequency changes are accomplished by rotating pinion 28 and laterally moving rack 27 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 can 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 protrusions that displace the tuning of the preset section 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 cross-sectional view of the klystron tuning mechanism of the present invention, Fig. 2 is a detailed view of the preset section of Fig. 1, Fig. 3 is a cross-sectional view of a conventional klystron tuning mechanism, and Fig. 4 is Fig. 3. FIG. 1, 21... Cavity resonator, 2, 22... Tuning, 4, 23... Tuning mechanism, 5, 25... Tuning support mechanism, 7, 29... Preset section, 9... Gear, 10 , 11, 13, 26... Frequency setting screw, 27... Rack, 28... Pinion, 30...
…Chuunashaft.

Claims (1)

[Claims] 1. A tuning support mechanism that is connected to the tuning which forms a part of the klystron cavity resonator and always applies a force in the opposite direction to the atmospheric pressure to the tuning, and a tuning support mechanism that has a plurality of convex portions and a preset portion that contacts and mechanically displaces at least a portion of the support mechanism to which the convex portion of the preset portion is connected to the tuner, and a portion of the support mechanism to which the tuner is connected to a convex portion of the preset portion; In a klystron tuning mechanism comprising a drive mechanism having means for connecting and disconnecting, the convex portion of the preset portion includes a set of convex portions disposed along the drift tube axis of the cavity resonator; A tuning mechanism for a klystron, comprising at least one further set of convex portions disposed at a position parallel to the one set of convex portions in a direction perpendicular to the drift tube axis.