Microwave Suppression Waveguide for Uniform Conveyor Food Heating

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Solution Overview

Problem

Existing food processing machines face challenges such as high entry costs, inefficiency in cooking thinner materials, interference with cellular signals, and costly magnetron replacements, while also requiring substantial shielding and inefficient microwave energy delivery.

Innovation Solution

The development of waveguide assemblies that efficiently convert and direct microwave energy at desired frequencies into the chamber, utilizing a rectangular waveguide, mode converter, circular waveguide with tuning blocks, and bent waveguide to achieve homogeneous energy distribution and minimize leakage, along with a microwave suppression system to prevent energy loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If microwave energy is generated and directed into the chamber using conventional methods, then food products can be heated, but uneven cooking occurs and energy distribution is inefficient

Engineering Contradiction:

Improvecooking efficiencyVSAvoidenergy distribution uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The waveguide assembly is divided into multiple functional segments: rectangular waveguide section, mode converter section, circular waveguide section with tuning blocks, and bent waveguide section. Each segment performs a specific function to progressively transform and optimize microwave energy distribution, converting single-mode input into multi-mode homogeneous distribution in the chamber.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The waveguide assembly incorporates adjustable tuning blocks within the circular waveguide section that can be dynamically positioned to optimize energy distribution. The assembly allows for adjustment of waveguide dimensions and configurations to adapt to different cooking requirements and achieve uniform energy penetration.

Inventive Principle:

Principle #15Dynamics

2Productivity

If microwave energy is directed through the sidewall into the chamber, then heating can be achieved, but energy leakage occurs reducing efficiency

Engineering Contradiction:

Improveheating capabilityVSAvoidmicrowave energy leakage

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The bent waveguide section is designed to direct microwave energy through the sidewall in a controlled manner. What could be considered leakage (energy passing through the sidewall) is converted into a beneficial feature by using the sidewall itself as the transmission path, with the bent waveguide optimizing the energy direction and distribution through this path while minimizing actual energy loss.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If conventional waveguide systems are used, then microwave energy can be transmitted, but costly magnetron replacements are required and entry costs are high

Engineering Contradiction:

Improvesystem operabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The waveguide assembly is designed as a complete, self-contained unit with integrated rectangular and circular waveguide sections, mode converters, and tuning blocks. This modular self-service design allows the entire assembly to be replaced as one unit rather than requiring expensive magnetron replacements, reducing maintenance costs and simplifying manufacturing.

Inventive Principle:

Principle #25Self-service

4Speed

If microwave energy is generated at high power, then cooking speed increases, but interference with cellular signals occurs

Engineering Contradiction:

Improvecooking speedVSAvoidcellular signal interference

Core Design Contradiction:

SpeedVSObject-generated harmful factors

Solution Approach 1:

The waveguide assembly creates localized multi-mode energy distribution patterns within the chamber, concentrating energy where needed for efficient cooking while controlling the spatial distribution to minimize electromagnetic interference with external cellular signals. The tuning blocks allow local adjustment of energy patterns.

Inventive Principle:

Principle #3Local quality

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 solution enhances microwave energy transmission, reduces uneven cooking, minimizes energy reflection, and prevents leakage, improving cooking efficiency and safety.

Implementation Method 1

A microwave generating device coupled to the sidewall is configured to generate microwave energy

Methodology Applied

Scientific EffectMicrowave heating: Dielectric Heating

Implementation Method 2

a waveguide assembly configured to receive the microwave energy from the microwave generating device and direct the microwave energy into the chamber

Methodology Applied

Scientific EffectWaveguide: Waveguide

Data Source

PatentUS12563647B2Food processing machines with microwave heating systems and microwave suppression systems

Publication Date: 2026.02.24 ALKAR RAPIDPAK INC

AI summary

A food processing machine for processing a food product includes a processing module having a housing with a sidewall, opposing end walls, and a chamber between the end walls and a conveyor extending through the end walls and the chamber and configured to convey the food product through the chamber. A microwave generating device is coupled to the sidewall and configured to generate microwave energy. A waveguide assembly is configured to receive the microwave energy, direct the microwave energy along a waveguide axis, and subsequently direct the microwave energy in a transverse direction that is transverse to the vertical direction through the sidewall and into the chamber such that the microwave energy heats the food products.