Magnetron Choke Structure for Coaxial Alignment and Vacuum Stability
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Solution Overview
Problem
High-output industrial magnetrons face challenges in fabricating magnetic poles with complex shapes, leading to issues like burr formation, sagging, and coaxial deviations during assembly, which result in in-tube discharge and vacuum degradation.
Innovation Solution
The magnetron design incorporates a seamlessly formed choke structure that covers the opening rim of the input-side magnetic pole, reducing coaxial deviations and accumulated filler metal, thereby preventing in-tube discharge and vacuum degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a magnetic pole with complicated shape is fabricated by press forming, then the magnetic pole can be formed with deep drawing and stepped shape, but burr or sagging may occur and coaxial deviation or accumulated filler metal may occur at fixing
Solution Approach 1:
The magnetic pole is divided into multiple segments that are separately formed and then assembled together. This segmentation allows each segment to be formed with simpler geometry, avoiding burr and sagging issues, while the assembly process enables the overall complicated shape to be achieved without excessive filler metal accumulation or coaxial deviation
Solution Approach 2:
The magnetic pole segments are pre-formed with precise dimensions and coaxial alignment before final assembly. This preliminary action ensures that when the segments are fixed together, minimal filler metal is needed and coaxial deviation is prevented, resolving the manufacturing precision issues
2Ease of manufacture
If the magnetic pole and cylindrical choke structure are fixed together, then the assembled structure can be formed, but coaxial deviation or accumulated filler metal may occur making it difficult to fabricate with designed dimensions
Solution Approach 1:
A precision定位 fixture or alignment mechanism is introduced as an intermediary during the assembly of the magnetic pole and choke structure. This intermediary ensures precise coaxial alignment and position control, preventing dimensional deviations while maintaining ease of assembly
Solution Approach 2:
The assembly process parameters are optimized, including the sequence of fixing, the amount of filler metal applied, and the pressing force applied. By carefully controlling these parameters, dimensional accuracy is maintained while still allowing for easy assembly of the magnetic pole and choke structure
3Productivity
If conventional fabrication methods are used for high-output industrial magnetrons, then production can proceed, but in-tube discharge and degradation of in-tube vacuum occur
Solution Approach 1:
The invention converts the potentially harmful effects of burr and sagging into beneficial outcomes by using precision forming techniques that eliminate these defects. This prevents in-tube discharge and protects vacuum integrity while maintaining production capability
Solution Approach 2:
The assembly and fabrication process is conducted in a controlled environment that prevents contamination and maintains vacuum integrity. By creating an inert protective atmosphere during manufacturing, in-tube discharge is prevented and vacuum stability is ensured while production continues
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses in-tube discharge and vacuum degradation by minimizing coaxial deviations and unevenness caused by filler metal, enhancing the stability and service life of high-output magnetrons.
Implementation Method 1
A magnetron is a device that generates microwave
Implementation Method 2
The input-side magnetic pole and the output-side magnetic pole are disposed in the input-side opening part and the output-side opening part, respectively
Data Source
AI summary
A magnetron includes an anode cylindrical body, a plurality of vanes, a cathode filament, an input-side magnetic pole, an output-side magnetic pole, and a choke structure. The anode cylindrical body has a cylindrical shape with an input-side opening part and an output-side opening part. The plurality of vanes is radially disposed from a central axis of the anode cylindrical body to an inner wall surface of the anode cylindrical body. The cathode filament is disposed along the central axis of the anode cylindrical body. The input-side magnetic pole and the output-side magnetic pole are disposed on the input-side opening part and the output-side opening part, respectively. The choke structure is seamlessly formed and disposed so as to cover an opening rim of the input-side magnetic pole with respect to the central axis of the anode cylindrical body.