Heat Pump Dryer U-Trap Sealing Against Air Leakage

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Solution Overview

Problem

Clothes dryers using heat pump systems face inefficiencies due to air leakage through gaps between evaporators and condensers, which reduces heat exchange efficiency and increases energy consumption.

Innovation Solution

A 'U' trap is formed on the bottom surface of the circulation channel to prevent air leakage, allowing more air to participate in heat exchange with the evaporator, and condensed water is naturally collected to enhance the heat pump system's efficiency without a separate water supply device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a heat pump system is used in a clothes dryer, then energy efficiency is improved through heat recovery, but air leakage through gaps between evaporators and condensers reduces heat exchange efficiency and increases energy consumption

Engineering Contradiction:
Improveenergy efficiencyVSAvoidenergy loss due to air leakage
Core Design Contradiction:
Use of energy by moving objectVSLoss of energy

Solution Approach 1:

The patent converts the harmful effect of air leakage into a beneficial sealing mechanism. The 'U' trap structure utilizes the weight of condensed water to create a seal that prevents air leakage, transforming what was previously a harmful gap into a functional sealing solution that improves heat exchange efficiency and reduces energy loss.

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

Solution Approach 2:

The patent introduces condensed water as an intermediary substance to seal the gap between the evaporator and condenser. The 'U' trap structure holds condensed water, which acts as a barrier to prevent air leakage while allowing the heat pump system to maintain efficient heat exchange operations.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Power

If evaporators and condensers are installed in a circulation channel, then heat exchange capability is improved, but gaps between components cause air leakage that reduces system performance

Engineering Contradiction:
Improveheat exchange capabilityVSAvoidsystem performance due to air leakage
Core Design Contradiction:
PowerVSReliability

Solution Approach 1:

The patent transforms the gap between evaporators and condensers from a source of air leakage into a functional space for the 'U' trap sealing mechanism. The condensed water in the 'U' trap actively seals this gap, converting the structural gap into a reliable sealing arrangement that maintains system performance.

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

Solution Approach 2:

The system uses its own condensed water byproduct to create the sealing action in the 'U' trap. This self-service mechanism eliminates the need for external sealing components or additional energy input, as the condensed water naturally accumulates and provides the sealing function to prevent air leakage.

Inventive Principle:
Principle #25Self-service

3Loss of energy

If air leakage is prevented using traditional sealing methods, then heat exchange efficiency is improved, but system complexity and cost increase

Engineering Contradiction:
Improveheat exchange efficiencyVSAvoidsealing system complexity
Core Design Contradiction:
Loss of energyVSDevice complexity

Solution Approach 1:

The patent employs a self-service sealing mechanism where the heat pump system's own condensed water is utilized to create the seal in the 'U' trap. This eliminates the need for separate sealing devices, mechanical components, or additional control systems, thereby maintaining simplicity while effectively preventing air leakage and improving heat exchange efficiency.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

Instead of adding complex sealing mechanisms to address air leakage, the patent converts the previously harmful air leakage path into a beneficial sealing structure. The 'U' trap uses condensed water weight to create a passive seal, transforming the gap into a functional sealing solution without increasing device complexity.

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

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 'U' trap configuration improves condensation efficiency and energy efficiency by ensuring more air is used for heat exchange, and the use of naturally generated condensed water enhances the heat pump system's performance, reducing energy consumption.

Implementation Method 1

cooling and heating air that flows through the circulation channel... improving condensation efficiency of air that flows through the circulation channel

Methodology Applied
Scientific EffectCondensation: Condensation

Implementation Method 2

cooling and heating air that flows through the circulation channel

Methodology Applied
Scientific EffectHeating: Heating

Data Source

PatentUS9200841B2Clothes dryer
Publication Date: 2015.12.01 LG ELECTRONICS INC
  • US9200841B2 patent drawing
  • US9200841B2 patent drawing
  • US9200841B2 patent drawing

AI summary

A clothes dryer is provided. The clothes dryer may include a main body having a drum rotatably installed therein, a circulation channel formed in the main body, the circulation channel defining a path of air that flows through the drum to dry an object to be dried, and a heat pump system having an evaporator, a compressor, an expansion apparatus, and a condenser, the heat pump system cooling and heating air that flows through the circulation channel. The evaporator may be mounted in the circulation channel, and a ā€˜U’ trap may be positioned below the evaporator in the circulation channel.