Compact Magnetron Structure for Efficient Microwave Heating
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Solution Overview
Problem
The large size of magnetrons in microwave heating devices limits device miniaturization and affects output efficiency, leading to energy waste and overheating issues.
Innovation Solution
A redesigned magnetron with a reduced tube core height and optimized antenna cross-sectional area ratio, along with heat dissipation features, to ensure miniaturization without compromising efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the magnetron size is reduced to enable device miniaturization, then the device volume is reduced, but the output efficiency of the magnetron deteriorates and energy loss increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tube core height (H1 ≤ 14mm) and optimizing the H1/S ratio (0.4-3.3) to achieve miniaturization while maintaining output efficiency above 70%. This involves changing the dimensional parameters of the magnetron structure to resolve the contradiction between volume reduction and energy loss prevention
Solution Approach 2:
The patent introduces dynamic heat dissipation mechanisms including heat dissipation holes in the tube core and optimized thermal pathways. The heat dissipation member with oblique branches creates dynamic thermal management that adapts to the compact structure, ensuring efficient heat removal in the miniaturized design while maintaining high output efficiency
2Length of stationary object
If the tube core height is reduced to miniaturize the magnetron, then the device size is reduced, but the heat dissipation capability deteriorates leading to overheating
Solution Approach 1:
The patent transitions from vertical heat dissipation (single dimension) to multi-directional heat dissipation by introducing heat dissipation holes in the tube core and oblique heat dissipation branches. This creates three-dimensional thermal pathways that effectively dissipate heat in the compact structure without increasing the tube core height
Solution Approach 2:
The patent introduces a porous heat dissipation structure with multiple heat dissipation holes (2101-2106) in the tube core. This porous design increases the heat dissipation surface area and creates multiple thermal pathways, enabling effective heat removal in the miniaturized magnetron while maintaining low tube core height
3Loss of energy
If the antenna cross-sectional area is increased to improve output efficiency, then the energy transmission is improved, but the magnetron volume increases
Solution Approach 1:
The patent optimizes the antenna cross-sectional area parameter (S) and its relationship with tube core height (H1/S ratio = 0.4-3.3) to achieve the best balance between energy transmission efficiency and volume reduction. This parameter optimization ensures high output efficiency while maintaining compact magnetron dimensions
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
The magnetron achieves miniaturization while maintaining output efficiency above 70%, reducing energy loss and preventing overheating, thus improving device performance and space utilization.
Implementation Method 1
A magnetron is a vacuum electron tube that generates microwaves
Implementation Method 2
the heat dissipation member is connected between the tube core and the housing
Data Source
AI summary
Provided are a magnetron and a microwave heating device. The magnetron includes a tube core, a first tube shell, a second tube shell, an output ceramic, an antenna cap, and an antenna. The first tube shell, the tube core, the second tube shell, the output ceramic, and the antenna cap are connected in sequence. The antenna extends into the tube core, and sequentially passes through the second tube shell and the output ceramic and extends into the antenna cap. A height H1 of the second tube shell relative to the tube core is smaller than or equal to 14 mm, and a ratio H1/S of a height H1 of the tube core to a cross-sectional area S of the antenna ranges from 0.4 to 3.3.