Compressor Stop-Time Pressure Equalization in Air Conditioners
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Solution Overview
Problem
Conventional air conditioners experience unnecessary delays and discomfort due to prolonged pressure equalization times when switching operation modes or starting after a compressor stop, leading to unwanted refrigerant noise and extended startup times.
Innovation Solution
The air conditioner employs pressure equalizing units that adjust refrigerant pressure based on the duration of compressor stoppage, skipping unnecessary equalization when the compressor has been stopped for a predetermined time, thereby reducing startup time and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pressure equalization control is performed when switching operation modes or starting after compressor stop, then refrigerant noise is prevented, but startup time is extended
Solution Approach 1:
The control method dynamically adjusts pressure equalization execution based on compressor stoppage duration. When stoppage exceeds a predetermined threshold, pressure equalization is skipped to enable immediate startup. When stoppage is within the threshold, pressure equalization is performed to prevent noise. This dynamic decision-making resolves the contradiction by adapting the noise prevention measure to actual operating conditions.
Solution Approach 2:
The invention changes the parameter of pressure equalization execution (from always executed to conditionally executed) based on the stoppage time parameter. By monitoring stoppage duration and comparing it against a threshold, the system adjusts whether to perform pressure equalization, thereby balancing noise prevention with startup speed requirements.
2Object-affected harmful factors
If pressure equalization control is performed uniformly regardless of compressor stoppage duration, then refrigerant noise is prevented, but unnecessary delays occur when compressor has been stopped for long time
Solution Approach 1:
Instead of uniformly applying pressure equalization in all cases (excessive action), the invention applies it only when necessary - specifically when compressor stoppage duration is within a predetermined threshold (partial action). This avoids unnecessary delays when the compressor has been stopped for long periods, thereby improving operational efficiency while still preventing noise when needed.
Solution Approach 2:
The control system monitors its own operating state (compressor stoppage duration) and automatically adjusts pressure equalization execution accordingly. The system serves itself by making intelligent decisions about whether noise prevention is necessary based on the current operational context, eliminating the need for external intervention or uniform treatment of all scenarios.
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 approach reduces the time required for the air conditioner to start operating and minimizes refrigerant noise, enhancing user comfort by optimizing pressure equalization controls based on compressor stoppage duration.
Implementation Method 1
the high pressure side indoor switch valve and the low pressure side indoor switch valve are made to communicate with each other through the bypass pipe, thereby equalizing a pressure between the high pressure side and the low pressure side
Data Source
AI summary
An air conditioner 1 of the embodiment of the present invention, when all compressors 21a-21c have been stopping for a given time or more, starts an air conditioning operation without performing pressure equalizing control in switch units 6a-6d with starting the operation of the air conditioner 1. Also, when the stopping time of all compressors 21a-21c is less than the given time, the air conditioner 1 performs the pressure equalizing control by controlling switch units 6a-6d with starting the operation of the air conditioner 1. In this case, when the stopping time reaches the given time during execution of the pressure equalizing processing control, the pressure equalizing processing control being executed is stopped and the air conditioning operation is started.