RU2730171C1 - Axial-structure electron gun for o-type microwave device and method of its manufacturing - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to microwave vacuum devices, in particular, to electron guns in traveling-wave tubes of O-type with high control voltage. In O-type microwave device electron gun with high control voltage, which contains cathode, control electrode, anode and their supporting elements, insulators in the form of cylindrical rings with coaxial circular ledges on end surfaces are installed for electric insulation between electrodes. Insulators and supporting elements of electrodes are arranged in series in radial direction. In the method for manufacturing and assembling an electron gun of an O-type microwave device with high control voltage, in which by means of supporting elements a cathode, a control electrode and an anode is installed, insulators in the form of cylindrical rings with coaxial circular ledges on end surfaces are installed for electric insulation between electrodes. Insulators and supporting elements of electrodes are assembled in series in radial direction using telescopic junctions.EFFECT: simplified design, increased simplicity and accuracy of electron gun assembly, increased reliability and durability.2 cl, 2 dwg

Description

The invention relates to microwave electric vacuum devices, in particular, to electron guns in traveling wave tubes (TWT) of the O-type with a high control voltage.

Known methods for the manufacture of electron guns for microwave devices, which use insulators in the form of ceramic rings and supporting elements of the electrodes, soldered in one block [RF Patent No. 2080683, IPC: H01J 23/06, H01J 9/18, publ. 27.05.1997, Patent CN 201138653, IPC: H01J 23/06, publ. 22.10.2008, Patent CN 201877391, IPC: H01J 23/06, publ. 06/22/2011]. The disadvantage of these methods is the use of wires to supply voltage to the electrodes, while the position of the wires during assembly is difficult to control, they can touch the elements of the gun, which leads to a short circuit. With an increase in the applied control voltage, the dimensions of the insulators, respectively, of the supporting elements and of the gun itself, increase. The electrode block is placed in an additional vacuum-tight casing. Most often, ceramic insulators are used for electrical insulation. They are also used to reduce the temperature error [USSR author's certificate No. 1830153, IPC: H01J 29/48, H01J 29/50, publ. 23.07.1993], increasing the heat resistance and thermal protection of the electrode contacts, since the elements of the electron gun are attached directly to the insulating holders. So, for example, the down conductors of the cathode assembly are fixed through ring insulators [RF Patent No. 2238602, IPC: H01J 37/00, B23K 15/00, publ. 20.10.2004].

Closest to the claimed invention is a method of assembling electron guns with an end junction of insulators and supporting elements of electrodes in one block [USSR author's certificate No. 575962, IPC: H01J 23/06, publ. 11/07/1991]. In this method, the leads of the electrodes are visually monitored during the manufacture of the electron gun and no additional vacuum-tight casing is used.

The disadvantage of this method is that when it is used in the manufacture of an electron gun with a high control voltage, insulators and supporting elements of the electrodes are installed in series in the axial direction using end seals. Insulators are made in the form of cylindrical rings with circular projections on cylindrical surfaces. With an increase in the applied control voltage to the electrodes, the distance between the structural elements supporting the electrodes increases, and the dimensions of the elements themselves increase, since to ensure the electrical insulation distance, it is necessary to increase the dimensions of the insulators. As a result, vibration increases the vibrations of the electrodes and decreases the assembly accuracy, which in turn leads to additional requirements for the accuracy of manufacturing the elements of the electron gun and assembling the electron gun itself.

The technical result of the present invention is to simplify the design, increase the simplicity and accuracy of the assembly of the electron gun, as well as increase the reliability and durability.

The technical result is achieved by the fact that in the electron gun of the O-type microwave device with a high control voltage, which contains a cathode, a control electrode, an anode and their supporting elements, insulators in the form of cylindrical rings with coaxial circular protrusions on the end surfaces are installed for electrical insulation between the electrodes ... Insulators and supporting elements of the electrodes are arranged in series in the radial direction.

In addition, the technical result is achieved by the fact that in the method of manufacturing and assembling an electron gun of an O-type microwave device with a high control voltage, in which a cathode, a control electrode and an anode are installed with the help of supporting elements, for electrical insulation between the electrodes, insulators in the form of cylindrical rings with coaxial circular projections on the end surfaces. The assembly of insulators and supporting elements of the electrodes is carried out sequentially in the radial direction using telescopic joints.

Thanks to the use of such insulators and such an arrangement of elements, it became possible to reduce the size, simplify the design and requirements for the accuracy of manufacturing the supporting elements of the electrodes, and simplify the manufacturing method and requirements for the manufacture of insulators. The contacts of the electrodes can be easily controlled during the assembly of the gun and later in the TWT. An additional vacuum-tight jacket is not required.

FIG. 1 and FIG. 2 presents diagrams of the design of the electron gun, explaining the implementation of the proposed assembly method with various design options for insulators. They show the arrangement of the insulators (1, 2, 3) of the cathode (4), the control electrode (5), the anode (6), the supporting element of the anode (7), the supporting element of the control electrode (8), the supporting element of the cathode (9), bushings (10). This arrangement of the elements of the electron gun makes it possible to reduce the console of the supporting elements of the electrodes (7, 8, 9), improves visual observation of the quality of the soldered seams and the position of the electrode contacts.

Insulators (1, 2, 3), due to the end protrusions, increase the electrical insulating distance between the electrodes. This makes it possible to increase the control voltage supplied to the electrodes - the anode (6), the control electrode (5), the cathode (4) - through the contacts on the supporting elements (7, 8, 9). It is enough to increase the dimensions of the end protrusions on the insulators in order to increase the electrical insulation distance, while the dimensions of the insulators (1, 2, 3) in the diametrical direction and the dimensions of the insulators at the soldering points with the supporting elements (7, 8, 9, 10) in the axial direction do not increase therefore, the dimensions of the supporting elements (7, 8, 9, 10) do not increase either in the diametrical or axial direction, the dimensions of the gun do not increase either. When using this design and this method of assembling the gun, the supporting elements (7, 8, 9, 10) have a simple design. The size of the gun, regardless of the applied voltage, is compact. FIG. 2 differs from FIG. 1 with insulators of a simpler shape, a simpler device is needed for their manufacture, but they have large end protrusions.

A sleeve (10) is installed on the device on which the optical dimensions of the electron gun are to be set with subsequent soldering, then an insulator (1) is installed, then an anode support element (7), then an insulator (2), then a control electrode support element (8) , then the control electrode (5), then the insulator (3), then the supporting element of the cathode (9), after which these elements of the gun are soldered into one block. In the next step, the cathode (4) is installed, then the anode (6). This electron gun has a simple design, consists of simple elements, and does not require complex devices for its manufacture, which ensures the reliability and quality of microwave lamps.

Sources of information

1. RF patent №2080683 dated 05/27/1997, Abanovich SA, Afanasyev AI, Kuznetsov SV, Khadzhi DL. / A method of manufacturing and assembling an electron gun with an anode block of an O-type microwave lamp.

2. Patent CN 201138653 from 22.10.2008 Huaxia Wu, Wei Fang, Xudong Shen, Linli Bao, Zhaohong Meng, Hao Wang, Pengfei Zhang, Zhenjing Ma / Bimodule multi-pouring traveling-wave grid controlled electronic gun.

3. Patent CN 201877391 from 22.06.2011 Huaxia Wu, Zhaochang He, Shengyuan Lei, Jingchun Yuan, Gang Zhu, Meilin Sun, Qiujun Zhou, Hongmei Gao / Millimeter wave traveling wave tube electron gun structure.

4. USSR author's certificate No. 1830153 from 23.07.1993. Harry Edwin McCandless / Multibeam electron gun.

5. RF patent №2238602 from 20.10.2004. Movchan Boris Alekseevich (UA), Gavrilyuk Oleg Yakovich (UA) / Electron gun with a linear thermal cathode for electron beam heating.

6. USSR author's certificate №575962 from 07.11.1991 Lebedinsky SV, Lyubimov VA, Maltseva IA, Boykova NI, Kharlamova NT. / The electron gun is a prototype.

Claims (2)

1. An electron gun of an O-type microwave device containing a cathode, a control electrode, an anode and their supporting elements, characterized in that insulators in the form of cylindrical rings with coaxial protrusions on the end surfaces, arranged in series in the radial direction, are installed between the electrodes. 2. A method of manufacturing an electron gun of an O-type microwave device, including the installation of a cathode, a control electrode and an anode using supporting elements, characterized in that insulators in the form of cylindrical rings with coaxial protrusions on the end surfaces and an assembly of insulators are installed between the electrodes for electrical insulation The supporting elements of the electrodes are carried out sequentially in the radial direction using telescopic joints.

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