JPH0329875Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to the structure of a radiation-cooled multistage collector mainly used in high-power traveling wave tubes mounted on artificial satellites.

BACKGROUND OF THE INVENTION High-power traveling wave tubes mounted on artificial satellites must increase efficiency by minimizing power consumed as heat loss in the collector. Therefore, by equipping multiple collector electrodes and applying different voltages to each electrode, the electron beam, which has a velocity distribution after interaction with the high frequency, can be adjusted according to its velocity. A multi-stage collector is used that is configured to discriminate and capture heat and minimize heat loss.

In addition, in order to prevent the heat generated by the collector from increasing the temperature of the satellite itself, the traveling wave tube mounted on the satellite has the vacuum envelope of the collector protruded outside the satellite structure. , a radiation-cooled collector configured to directly radiate and dissipate the generated heat into space is used.

Conventionally used multi-stage collectors include a metallic vacuum envelope, a plurality of metallic threaded rod-shaped members disposed within the envelope and fixed to the envelope, and the threaded rod-shaped A cylindrical insulator attached to the member, a plurality of insulating spacers further attached on the cylindrical insulator, and an outer peripheral portion supported between the cylindrical spacers, and the threaded rod member is arranged in an axial direction. The structure includes a plurality of collector electrodes spaced apart from each other, and a nut that is screwed onto the threaded rod member to clamp and fix the collector electrode between the cylindrical spacers.

In a collector having such a structure, the heat generated at each collector electrode is transmitted by radiation from the collector electrode with a higher temperature to the electrode with a lower temperature, and then from each collector electrode to the vacuum envelope, It is also transmitted by conduction from the high-temperature collector electrode to the vacuum envelope via an insulating spacer and the low-temperature collector electrode, and is finally dissipated from the vacuum envelope into space by radiation.

In this way, the heat generated at the collector electrode increases the temperature of the entire collector, so contacting parts of members made of different materials may be damaged due to the difference in thermal expansion of the respective materials, so it is recommended to use brazing or other methods to secure them together. is not desirable. Therefore, in a collector having multistage electrodes, the assembly of the electrodes and insulators and their attachment to the support member are mechanically tightened using screws and nuts, and a dish-shaped spring washer is inserted into one end of the threaded rod-shaped member. The elastic force is used to press the respective collector electrodes and spacers together, thereby maintaining the mechanical stability of each member while avoiding damage to the contact area due to differences in thermal expansion of the constituent members.

In this way, the radiation-cooled multi-stage collector is small and lightweight, and at the same time is
Extremely high reliability is required against mechanical vibrations or changes in environmental conditions such as temperature, and the mechanical stability of the structure is required to be extremely high.

Problems that the invention aims to solve The launch of an artificial satellite is accompanied by extremely large vibrations and shocks, which naturally affect the traveling wave tube, which is the structure of the artificial satellite.

The insulating members of these high-output electron tubes are usually made of porcelain because of its high insulating properties, but this material is brittle against impacts and the like.

Therefore, in the conventional collector structure described above,
The spring washer absorbs the difference in thermal expansion while achieving mechanical stability. However, the elastic support is
Only each electrode and the collector electrode sandwiched therein are provided, and the elastic support provided by the spring washer does not extend to the cylindrical insulator attached to the threaded rod member.

However, the length of the cylindrical insulator inserted between the screw and the electrode is longer than that obtained by stacking the insulating spacers and collector electrodes alternately, taking into account the difference in thermal expansion with other members that make up the collector. It's getting a little shorter. For this reason, when a member having a large coefficient of thermal expansion, mainly a metal member, is in an expanded state, the cylindrical insulator moves into the tubular space defined inside the insulating spacer.

In this way, the cylindrical insulator is not always in a fixed state, so when it receives these vibrations and shocks, the cylindrical insulator is connected to the collector electrode, the insulating spacer, the metal support member, The surface rubs or collides with the screw. As a result, minute metal scraps are generated, which not only causes deterioration of the insulation between the collector electrodes or deterioration of the vacuum inside the tube due to gas release due to friction, but in the worst case, the insulating spacer and the cylindrical insulator itself may be destroyed. There is a risk of being

Means for Solving the Problems The present invention eliminates these conventional drawbacks and allows the insulating spacer or cylindrical insulator to be mounted on an artificial satellite with less risk of damage even when subjected to vibration or impact. The object of the present invention is to provide a radiation-cooled multistage collector that is more preferable as a component of a high-power traveling wave tube.

In other words, by making the cylindrical insulator structurally stable, it is possible to prevent the cylindrical insulator from rubbing against or colliding with the collector electrode, insulating spacer, or metal support member when vibrations or shocks are applied to the traveling wave tube. This improves the reliability of the radiation-cooled multi-stage collector against mechanical vibrations or shocks.

According to the present invention, a metallic vacuum envelope, a plurality of metallic threaded rod members disposed within the envelope and fixed to the envelope, and attached to the threaded rod members are provided. a cylindrical insulator, a plurality of insulating spacers further mounted on the cylindrical insulator, and an outer peripheral portion supported between the cylindrical spacers and spaced apart from each other in the axial direction of the threaded rod member. A radiation-cooled multi-stage collector comprising a plurality of collector electrodes and a nut screwed onto the threaded rod-shaped member to clamp and fix the collector electrode between the cylindrical spacers, the nut being mounted on the rod-shaped member and having the cylindrical shape. The radiation-cooled multi-stage collector described above is provided, characterized in that it includes a coil spring that applies a force in the axial direction to the insulator.

Function In the collector according to the present invention having the structure described above, each collector electrode and the insulating spacer are strongly tightened in the axial direction by screws and nuts via dish-shaped spring washers, so that external vibrations and shocks are not applied. Also, spacers etc. do not rub against other members. On the other hand, since the cylindrical insulator is pressed toward either of the supporting members by the spring coil, the cylindrical insulator does not shift. Therefore, it is always in a stable state as a whole.

EXAMPLES Next, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view showing a multi-stage collector according to the present invention taken along a plane through which its central axis passes.

A support plate 2 for supporting the collector is brazed to the body 1 (only a portion is shown), and a cylindrical thin-walled metal vacuum envelope 4 is brazed to the support plate 2 via a stainless steel bellows 3. The vacuum envelope 4 and the dish-shaped vacuum envelope 5 made of thin metal are arc welded to each other so as to sandwich a support plate 13 at their respective flanges to form a vacuum envelope of the collector. Further, a support plate 7 is brazed to the support plate 2 via stainless steel columns 6. The outer edge of the support plate 7 is brazed to the connection between the bellows 3 and the vacuum envelope 4. Each of the first to fourth collector electrodes 8, 9, made of a thin metal plate into a desired shape;
10 and 11 are supported by porcelain spacers 12 at several locations symmetrical about the center axis with a required spacing maintained in the direction of the center axis. And insulating spacer 1
2, the first collector electrode 8 side is connected to the support body 7, and the fourth collector electrode 11 side is connected to the support plate 13. Inside the insulating spacer 12, a threaded rod member 14, a ceramic insulating tube 15, and a spring coil 20 pass through holes drilled in each of the first to fourth collector electrodes, and one end of the screw 14 is brazed to the support plate 7, and the other end is passed through the support plate 13, and after two disc-shaped spring washers 16 are placed facing each other, they are tightened with a nut 18 via a flat washer 17. The central part of the fourth collector electrode 11 is connected to the vacuum envelope 5 through a ceramic insulating member 19.
It is in contact with the center of the bottom.

In the collector according to the present invention having such a configuration, voltages having a large potential drop from the body potential are applied to the first to fourth electrodes in that order by a feed plug (not shown). Therefore, among the electron beams that have generated a velocity distribution due to interaction with the high frequency, the slowest electrons reach the first collector electrode,
Electrons with higher speeds are incident on each of the second to fourth collector electrodes in order, and heat loss occurs depending on the speed of the electrons at the time of incidence. The heat generated at each collector electrode is transferred in part by radiation from the hotter collector electrode to the cooler collector electrode and from each collector electrode to the vacuum envelope. Or, insulating spacer 1
2 to the support plates 7 and 13 by conduction and further to the vacuum envelope by conduction. Furthermore, a portion of the heat is transferred from the fourth collector electrode 11 to the vacuum envelope 5 by conduction through the porcelain insulating member 19. Since the support plate 7 and the vacuum envelope 4 are insulated from the support plate 2 by the stainless steel posts 6 and bellows 3, which have poor thermal conductivity, almost no heat generated in the collector is transferred to the body side. It is dissipated by radiation from the surface of the collector vacuum envelope into space.

The collector electrodes 8 , 9 , 10 , 11 and the insulating spacer 12 are strongly tightened in the axial direction by screws 14 and nuts 18 via disc-shaped spring washers 18 , while the cylindrical insulator 15 is tightly tightened by the spring coil 20
Therefore, in this embodiment, since it is pressed toward the support member 13, it is always in a stable state. Therefore, even if vibrations or shocks are applied from the outside, the cylindrical insulator 15 will not rub against other members or strongly collide with surrounding members, and the cylindrical insulator 15 will not generate fine powder due to these frictions or impacts. Alternatively, it is possible to prevent the insulator member from being damaged.

Effects of the Invention As detailed above, the multi-stage collector provided by the present invention has a cylindrical insulator that is kept in a mechanically stable state by a coil spring, so it is not susceptible to vibrations or shocks caused by other components. There will be no rubbing or collision with the pipes, and deterioration of the insulation, deterioration of the degree of vacuum in the tube, and damage to the insulating spacer or cylindrical insulator due to these can be avoided.
The reliability of traveling wave tubes as components of artificial satellites can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional view of one embodiment of a radiation-cooled multi-stage collector according to the present invention, taken along a plane through which its central axis passes. Main reference numbers, 1...Body, 2, 7, 13...
... Support plate, 4, 5 ... Vacuum envelope, 8, 9, 1
0,11...first to fourth collector electrodes, 12,1
9...Insulating spacer, 14...Screw, 15...
Cylindrical insulator, 16...Dish-shaped spring washer, 17...
...flat wire, 18... nut, 20... spring coil.

Claims (1)

[Claims for Utility Model Registration] A metallic vacuum envelope, a plurality of metallic threaded rod members disposed within the envelope and fixed to the envelope, and the threaded rod members. a cylindrical insulator mounted on the cylindrical insulator; a plurality of insulating spacers further mounted on the cylindrical insulator; A radiation-cooled multi-stage collector comprising a plurality of collector electrodes spaced apart from each other, and a nut screwed onto the threaded rod member to clamp and fix the collector electrode between the cylindrical spacers, the nut being mounted on the rod member. The radiation-cooled multi-stage collector further comprises a coil spring that applies a force in the axial direction to the cylindrical insulator.