Structure for improving heating efficiency of cathode heater assembly and preparation method thereof

Abstract

The invention discloses a structure for improving the heating efficiency of a cathode heater assembly and a preparation method thereof, relates to a vacuum electronic technology and is applied to development and production of space traveling wave tubes in wavebands X, ku and ka. A heat shield cylinder is made of a refractory metal or alloy leather with the thickness of 0.05mm. The heat shield cylinder is structurally a cylinder of which the surface is transversely provided with a heat insulation slot. The preparation method comprises the following steps of: processing the heat insulation slotwith the regular shape on the surface of the heat shield cylinder by adopting a spark cutting processing method; and carrying out local point connection between the heat shield cylinder and a cathodemolybdenum cylinder as well as a cathode base by using a point welding method. The cathode heater assembly with the structure has high reliability and a firm structure. By means of a method for lengthening a heat conduction path and reducing the contact surface, the conducted heat is reduced and the power consumption of a heater is obviously reduced, so that the heating efficiency of the cathode heater assembly is improved. The preparation method has the characteristics of simple process, low cost, strong controllability and the like.

Description

technical field [0001] The invention relates to the technical field of vacuum electronics, and relates to a structure and a preparation method for improving heating efficiency of a cathode thermal subassembly applied to a space traveling wave tube. Background technique [0002] Space (satellite) traveling wave tubes and amplifiers are one of the key components in the field of space technology. As microwave power amplification sources, they undertake and play data transmission, communication, navigation and positioning, and electronic reconnaissance and countermeasures on various military and civilian satellite transponders. function and role. [0003] As the core component of microwave electric vacuum devices, hot cathodes often determine the level of overall application performance of the devices. Especially for space traveling wave tubes, due to the long service life and limited power supply capacity, the technical requirements for the cathode thermal subassembly are even...

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Problems solved by technology

[0005] In the preparation of the cathode thermal subassembly, the heat shield made of refractory metal material can reduce heat radiation, and reduce the heat conduction cross-sectional area by reducing the thickness of the heat shield material, thereby improving the heating efficiency, but the thickness is too small, the heat shield The strength of the material will be significantly reduced, so that the support strength of the heat shield tube to the cathode is weak, so that it cannot meet the very harsh environmental test conditions for space devices such as space traveling wave tubes, such as shock and vibration tests, etc.

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