Magnetron Anode Vane Dimensions and Pole Piece Geometry
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Solution Overview
Problem
Conventional magnetrons face challenges in improving oscillation output efficiency without increasing the size of permanent magnets, leading to higher costs and voltage requirements, while minimizing the diameter of vane tips to avoid rising anode voltage.
Innovation Solution
Optimized dimensions and design of the anode part and magnetic circuit, including smaller diameter vane tips and strategically positioned annular permanent magnets, to enhance magnetic flux density in the interaction space without enlarging the magnetron body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the magnetic flux density in the interaction space is increased to improve oscillation output efficiency, then the oscillation output efficiency is improved, but the permanent magnet requires to be enlarged or highly performed leading to increased cost
Solution Approach 1:
The patent changes the geometric parameters of the pole pieces (inner diameter of through-hole, outer diameter of bottom portion, mutual distance between base portions) to optimize the magnetic flux density distribution in the interaction space, achieving improved oscillation output efficiency without requiring larger or more expensive permanent magnets
Solution Approach 2:
The patent applies different dimensions and configurations to different parts of the pole pieces (base portion, tapered portion, bottom portion) to optimize the magnetic field distribution locally in the interaction space, thereby improving overall efficiency without uniform enlargement of all components
2Force
If the permanent magnet is enlarged to increase magnetic flux density, then the magnetic flux density is increased, but the overall size of the magnetron increases
Solution Approach 1:
The patent optimizes the dimensions of the pole pieces (inner diameter P1: 8.3-8.5mm, outer diameter P2: 11.0-16.0mm, mutual distance A1: 21.5-23.5mm) to concentrate and enhance the magnetic flux density in the interaction space without requiring enlargement of the permanent magnet, thus maintaining compact overall size
Solution Approach 2:
The patent utilizes the dimensional space created by the funnel-shaped pole piece structure (tapered from base to bottom) to concentrate magnetic flux in the interaction region, achieving high magnetic flux density without increasing the overall magnetron volume
3Power
If the diameter of vane tips is minimized to avoid rising anode voltage, then the anode voltage is kept conventional, but the oscillation output efficiency improvement is limited
Solution Approach 1:
The patent optimizes multiple parameters simultaneously including vane diameter (8.0-8.8mm), vane height (7.0-8.0mm), open area ratio (0.25-0.30), and pole piece dimensions to achieve improved oscillation output efficiency while maintaining conventional anode voltage levels
Solution Approach 2:
The patent combines optimized anode structure (vanes with specific dimensions and open area ratio) with optimized magnetic circuit structure (pole pieces with specific dimensions) to achieve synergistic improvement in oscillation output efficiency without requiring increased anode voltage
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
Achieves a 3 to 4% improvement in oscillation output efficiency while maintaining a conventional anode voltage and using existing permanent magnets, without increasing the overall size of the magnetron.
Implementation Method 1
a pair of annular permanent magnets arranged outside the pair of pole pieces respectively... Magnetic flux density Bg obtained in the interaction space is 0.17 to 0.21 tesla when the magnetic force that the existing permanent magnet possesses is converged by the pole piece
Implementation Method 2
a cathode part having a coil filament arranged along the tube axis of the anode cylinder... to supply the cathode part with electric power through the input part
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
Problem: To set out improvement of the oscillation output efficiency and miniaturization in respect to a magnetron. Means to solve the problem: At an oscillation frequency of 2450 MHz band, number of the vanes 2 constituting the anode part 20 of the magnetron 100 being 10, the diameter 2ra of the circle inscribing tip portions of the vanes 2 on the cathode 3 side being 8.0 to 8.8 mm, the diameter 2rc of the outer periphery of the filament 3a constituting the cathode part 3 being 3.5 to 3.9 mm, the height A3 of the vane in the direction of the tube axis is 7.0 to 8.0 mm, the mutual distance A1 between the bases of the pair of funnel-shaped pole pieces 4a, 4b fixed to both sides of the anode part being 21.5 to 23.5 mm, the mutual distance A2 between the bottom portions of the pair of pole pieces 4a, 4b being 10.2 to 11.2 mm, the inner diameter P1 of the through-hole of the pole piece being 8.3 to 8.5 mm, and the outer diameter P2 of the bottom portion being 11.0 to 16.0 mm are set up.