Magnetron Temperature Detection via Cooling Fin Nesting

Solution Overview

Problem

Conventional microwave ovens face challenges in detecting abnormal heat generated by the magnetron efficiently, leading to delayed temperature detection and potential apparatus damage due to wide allowable detection ranges, which compromises reliability during no-load operations.

Innovation Solution

The temperature detection device is positioned inside the cooling fin of the magnetron, allowing direct heat transfer from the anode and reducing temperature transfer loss, with control mechanisms activated based on pre-cooking temperature information to prevent erroneous detection and apparatus damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the temperature detection device is placed in the air guide to detect exhaust air temperature, then the device structure is simple, but the temperature detection is delayed and precision is reduced

Engineering Contradiction:

Improvedevice structureVSAvoidtemperature detection precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The temperature detection device is nested inside the cooling fin, which itself is part of the magnetron assembly. This nested configuration allows the detection device to be in direct thermal contact with the magnetron anode through the cooling fin, enabling immediate detection of abnormal temperature rises while maintaining a compact integrated structure.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The cooling fin serves as a thermal intermediary between the magnetron anode and the temperature detection device. The fin conducts heat from the anode to the detection device, providing rapid and accurate temperature monitoring while electrically isolating the detection device from the high-voltage components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the temperature detection device is placed in the air guide, then the detection range is wide, but the reliability of temperature control is reduced

Engineering Contradiction:

Improvetemperature control reliabilityVSAvoidtemperature detection precision

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The temperature detection device is positioned to detect temperature rises in the early stage, before abnormal heat fully develops. By placing the device inside the cooling fin that is in direct thermal contact with the anode, the system can detect temperature anomalies immediately upon generation, enabling preventive control actions before damage occurs.

Inventive Principle:

Principle #10Preliminary action

3Speed

If the temperature detection device detects exhaust air temperature, then the detection mechanism is simple, but the response time is delayed

Engineering Contradiction:

Improvetemperature detection speedVSAvoiddetection mechanism

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The temperature detection device is nested inside the cooling fin, which itself is part of the magnetron assembly. This nested configuration allows the detection device to be in direct thermal contact with the magnetron anode through the cooling fin, enabling immediate detection of abnormal temperature rises while maintaining a compact integrated structure.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The cooling fin serves as a thermal intermediary between the magnetron anode and the temperature detection device. The fin conducts heat from the anode to the detection device, providing rapid and accurate temperature monitoring while electrically isolating the detection device from the high-voltage components.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 configuration enhances detection precision, prevents apparatus damage, and ensures high safety and reliability by accurately distinguishing between loaded and no-load states, reducing the risk of erroneous detection and heat transfer loss.

Implementation Method 1

the temperature of the abnormal heat generated from the magnetron may be directly transferred from the anode to the temperature detection device via the cooling fin

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a blower for cooling the magnetron

Methodology Applied

Scientific EffectForced convection: Forced Convection

Implementation Method 3

a microwave oven that heats a heating object through high frequency supplied from a magnetron

Methodology Applied

Scientific EffectMicrowave radiation: Microwave Radiation

Data Source

PatentUS10076004B2Microwave oven

Publication Date: 2018.09.11 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A microwave oven includes: heating chamber (11) for accommodating a heating object; magnetron (12) for heating the heating object accommodated in heating chamber (11); blower (13) for cooling magnetron (12); temperature detection device (17) for detecting a temperature of magnetron (12); and a control device for controlling an output power of magnetron (12) on the basis of temperature information output from temperature detection device (17), wherein temperature detection device (17) is disposed inside cooling fin (19) of magnetron (12), and the control device controls magnetron (12) on the basis of the temperature information obtained before cooking is started, thereby reducing a temperature transfer loss of abnormal heat generated from magnetron (12) and efficiently transferring the heat.