Condensing Dryer Pump Chamber Defrost Control to Prevent Item Damage
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Solution Overview
Problem
Condensate freezing in the pump chamber of condensing dryers during winter months leads to failure in draining, causing potential water leakage and damage to drying items due to the continuous defrost operation without determining the presence of items in the drum.
Innovation Solution
A dryer equipped with sensors to detect the presence of drying items and the water level in the pump chamber, which limits the number of forced drains and stops defrost operations when the water level is not relieved, preventing further condensate accumulation and water leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dryer performs continuous defrost operation to melt frozen condensate in the pump chamber, then the condensate can be drained, but the drying items in the drum may be damaged by hot air and energy is wasted
Solution Approach 1:
The control unit performs a preliminary check by detecting whether the drum is empty before initiating the defrost operation. This preliminary action prevents the harmful effect of hot air damaging drying items by only activating the defrost function when the drum is confirmed to be empty, thus resolving the contradiction between reliable condensate drainage and protection of drying items
Solution Approach 2:
The system uses feedback from the drum empty detection unit to control the defrost operation. The detection result feeds back to the control unit, which then decides whether to activate the defrost function, creating a closed-loop control system that prevents damage to drying items while ensuring condensate drainage when needed
2Reliability
If the dryer drives the heat pump system to defrost the pump chamber regardless of water level sensor detection, then frozen condensate can be melted, but energy is wasted when no drying item is present
Solution Approach 1:
The system performs a preliminary detection of whether the drum is empty before initiating the energy-consuming defrost operation. This preliminary check ensures that the heat pump system is only activated when necessary (when drying items are present and condensate needs to be drained), preventing wasteful energy consumption while maintaining defrost reliability when needed
Solution Approach 2:
The drum empty detection result provides feedback to the control unit, which uses this information to intelligently control the heat pump system activation. This feedback mechanism creates an energy-efficient control strategy where the defrost operation is performed only when both the drum is empty and condensate drainage is needed, resolving the contradiction between reliability and energy consumption
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
Prevents water leakage and damage to drying items by controlling the defrost operation based on the presence of items in the drum, ensuring efficient condensate drainage and maintaining the dryer's functionality.
Implementation Method 1
the humid air discharged from the drum is heat exchanged and dehumidified through contact to the evaporator of the heat pump system and is heated through the condenser... during the heat exchange process described above, condensate from the air forms on the surface of the evaporator
Implementation Method 2
a drain pump operates to discharge the condensate accumulated in the pump chamber to the outside at regular periods or based on a predetermined water level
Implementation Method 3
to defrost the pump chamber, the dryer drives the heat pump system regardless of whether the water level sensor detects the full water level, and defrosts the pump chamber using the heat discharged from, e.g., an air passage through which the air circulating inside and outside the drum flows or the compressor provided near the pump chamber
Data Source
AI summary
Various embodiments of the present disclosure relate to a dryer that performs an ice removal operation. To this end, provided are: a drum configured to receive a drying item, at least one first sensor configured to detect a presence of the drying item in the drum, a pump chamber configured to store condensate, a drain pump configured to discharge the condensate from the pump chamber, and a controller configured to, when detecting the drying item in the drum based on a signal of the at least one first sensor, limit a number of forced drains of the drain pump to reduce a water level of the pump chamber.