Microwave heating device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microwave heating devices face challenges in achieving uniform and local heating of heating-target objects, with complex structures and increased device size required for simultaneous uniform and local heating capabilities.
Innovation Solution
A microwave heating device with a waveguide structure antenna featuring a rectangular cross-section, including symmetrical microwave extraction openings on the ceiling surface, emitting circularly polarized waves, and a rotating mechanism to ensure uniform and local heating of heating-target objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rotating antenna with waveguide structure is used to achieve uniform heating, then heating uniformity is improved, but device complexity increases
Solution Approach 1:
The waveguide structure is divided into multiple segments including a rotating antenna portion and a stationary waveguide portion. The waveguide is split into a first waveguide connected to the magnetron and a second waveguide connected to the rotating antenna, allowing independent rotation of the antenna while maintaining a fixed waveguide connection path.
Solution Approach 2:
The rotating portion is extracted and isolated as a separate component (rotating antenna with second waveguide) that can rotate independently from the stationary waveguide system. This extraction allows the antenna to rotate for uniform heating while the main waveguide structure remains fixed and simple.
2Adaptability or versatility
If additional mechanisms are added to achieve local heating capability, then heating versatility is improved, but device complexity increases
Solution Approach 1:
The system transitions from a static antenna to a dynamic rotating antenna that can change its orientation and position. The rotation mechanism allows the antenna to dynamically adjust its beam direction, enabling both uniform heating (when rotating) and local heating (when positioned specifically), all controlled by a single rotating mechanism rather than multiple separate systems.
Solution Approach 2:
The rotating antenna mechanism serves multiple functions: it enables uniform heating through rotation, achieves local heating through positioned stopping, and can be controlled to heat specific areas. A single rotating mechanism provides both uniform and local heating capabilities, making the system multi-functional without requiring separate mechanisms for each heating mode.
3Volume of moving object
If the antenna structure is simplified, then device size is reduced, but heating performance may deteriorate
Solution Approach 1:
The waveguide system is segmented into a compact first waveguide for magnetron connection and a separate second waveguide for the rotating antenna. This segmentation allows the antenna assembly to be smaller and more compact while maintaining effective microwave transmission through the divided waveguide paths.
Solution Approach 2:
The waveguide structure utilizes three-dimensional spatial arrangement with the first waveguide extending in one direction from the magnetron and the second waveguide connecting to the rotating antenna in a different orientation. This dimensional arrangement allows compact packaging of the microwave transmission path while maintaining heating performance.
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 device achieves efficient and uniform heating of heating-target objects, particularly in the central area, with improved directivity and heating capabilities, while maintaining a simpler structure and reducing device size.
Implementation Method 1
microwaves generated by a magnetron that is a typical microwave generating unit are transmitted in a waveguide to a waveguide structure antenna
Implementation Method 2
Microwaves emitted from the emission port are supplied into a heating chamber to microwave-heat a heating-target object
Implementation Method 3
The rotating antenna disclosed in PTL 1 has a waveguide structure that is magnetic-field coupled to a waveguide that transmits microwaves generated by a magnetron
Implementation Method 4
The waveguide structure section includes at least one microwave extraction opening formed on the ceiling surface to emit circularly polarized waves
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Waveguide structure antenna (5) has ceiling surface (9) and side wall surfaces (10a, 10b, 10c) defining waveguide structure section (8), as well as has front opening (13) to emit microwaves from front opening (13) toward a heating-target object. Waveguide structure section (8) includes coupling part (7) joined to ceiling surface (9) to couple microwaves into an internal space of waveguide structure section (8). Waveguide structure section (8) emits circularly polarized waves from at least one microwave extraction opening (14) formed on ceiling surface (9) into a heating chamber. At least one microwave extraction opening (14) includes at least a pair of microwave extraction openings (14) that is symmetrical with respect to pipe axis (V) of waveguide structure section (8). Waveguide structure section (8) has a flat area between the pair of microwave extraction openings (14). According to this aspect, the heating-target object loaded in the heating chamber can uniformly and locally be heated.