Control method for clothes dryer, and clothes dryer
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Solution Overview
Problem
Existing heat pump type clothes dryers with electrical heating pipes do not significantly reduce drying time due to the electrical heating pipe having to stop heating when the heat pump system reaches maximum load, and using a variable-frequency compressor further reduces drying speed.
Innovation Solution
A control method for a clothes dryer that cooperatively controls a heat pump system and an electrical heating system, allowing the electrical heating pipe to remain on after the compressor is turned on, with auxiliary condensing to reduce the heat pump system's load, and switching modes based on temperature and load conditions to maintain efficient drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrical heating pipe is turned on to improve drying speed, then the drying speed is improved, but the heat pump system load reaches maximum and the heating must be stopped
Solution Approach 1:
The patent segments the condensing process into two parts: primary condensing by the heat pump system's condenser and auxiliary condensing by a separate water condenser. This segmentation allows the auxiliary condenser to share the heat dissipation burden, enabling the electrical heating pipe to remain operational without causing the heat pump system to exceed its maximum load capacity.
Solution Approach 2:
The water condenser acts as an intermediary component that provides auxiliary heat dissipation capacity. By introducing this intermediate heat exchange device, the system can manage the thermal load more effectively, allowing continuous operation of the electrical heating pipe while preventing the heat pump system from being overloaded.
2Power
If the compressor frequency is reduced to lower heat pump system load, then the load is reduced, but the vapour condensing speed and drying speed are reduced
Solution Approach 1:
The patent segments the heat dissipation function between the heat pump system's condenser and a separate water condenser. This allows the compressor to maintain high frequency for rapid vapour condensing while the water condenser handles excess heat dissipation, preventing system overload without compromising drying speed.
Solution Approach 2:
The water condenser serves as an intermediary heat dissipation device that relieves the burden on the heat pump system. This enables the compressor to operate at optimal frequency for rapid condensing while the auxiliary condenser manages the thermal load, avoiding the need to reduce compressor frequency.
3Power
If the electrical heating pipe stops heating when heat pump load reaches maximum, then the heat pump system load is reduced, but the drying time is not reduced significantly
Solution Approach 1:
The patent segments the heating function into primary heating by the heat pump system's condenser and auxiliary heating by the electrical heating pipe. Simultaneously, the condensing function is segmented between the heat pump condenser and an auxiliary water condenser. This dual segmentation allows both heating systems to operate concurrently without causing the heat pump system to exceed its load capacity, thereby significantly reducing drying time.
Solution Approach 2:
The water condenser acts as an intermediary that enables continuous auxiliary heating. By providing additional heat dissipation capacity, it allows the electrical heating pipe to remain operational throughout the drying cycle, preventing interruptions in heating and significantly reducing overall drying time.
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 method improves drying speed and reduces drying time by maintaining the electrical heating pipe's operation, reducing the heat pump system's load without changing compressor frequency, and offering multiple modes for energy efficiency and user selection.
Implementation Method 1
air about to enter the clothes drying drum is controlled to be firstly heated by the condenser of the heat pump system
Implementation Method 2
further heated by the electrical heating pipe
Implementation Method 3
control air exhausted from the clothes drying drum to be pre-condensed by a water condenser, so as to reduce the temperature of the air entering the heat pump system
Implementation Method 4
assist heat dissipation of the condenser of the heat pump system via an auxiliary fan
Data Source
AI summary
The heat pump system and the electrical heating system of a clothes dryer are controlled to work cooperatively, thus allowing the clothes dryer to at least comprise a fast mode in which the electrical heating pipe of the heating system is turned on after the compressor of the heat pump system is turned on and operated stably. Air about to enter the clothes drying drum is controlled to be firstly heated by the condenser of the heat pump system and further heated by the electrical heating pipe, and then to enter the clothes drying drum, and the load of the heat pump system is reduced in an auxiliary condensing manner, when the load of the heat pump system is close to the maximum load. Therefore, simultaneous working of the electrical heating system and the heat pump system is ensured, and the clothes drying speed is improved.