Variable Displacement Swash Plate Compressor Startup With Liquid Refrigerant
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional variable displacement swash plate type compressors experience increased noise and vibration when starting in the presence of liquid refrigerant due to increased load.
Innovation Solution
A control method that includes determining the presence of liquid refrigerant through temperature and neglect conditions, applying power to the field coil assembly while withholding current to the electronic control valve initially, and delaying application of current to the electronic control valve based on elapsed time to minimize refrigerant discharge and reduce noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the compressor is started in the presence of liquid refrigerant, then the compressor can begin operation quickly, but noise and vibration increase due to increased load
Solution Approach 1:
The control method determines the presence of liquid refrigerant before startup and takes preliminary action by controlling the electronic control valve to prevent liquid refrigerant from entering the compression chamber during the initial operation phase, thereby avoiding noise and vibration while enabling quick startup
2Productivity
If the electronic control valve is activated immediately during startup, then refrigerant flow is controlled promptly, but liquid refrigerant may still be compressed causing noise and vibration
Solution Approach 1:
The system performs preliminary detection of liquid refrigerant presence and activates the electronic control valve in advance to block liquid refrigerant flow before compression begins, ensuring both prompt control and noise reduction
Solution Approach 2:
The control method uses feedback from temperature and neglect condition detection to dynamically control the electronic control valve, adjusting refrigerant flow based on real-time detection of liquid refrigerant presence to prevent noise and vibration while maintaining control responsiveness
3Loss of time
If the field coil assembly is powered without delaying the electronic control valve, then the disk engages the pulley quickly for immediate operation, but liquid refrigerant compression causes increased load
Solution Approach 1:
The control method applies power to the field coil assembly immediately for quick engagement, but simultaneously performs preliminary control of the electronic control valve to prevent liquid refrigerant compression, thus achieving both quick engagement and reduced load
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
Reduces noise and vibration by controlling the compressor's operation to manage liquid refrigerant effectively, ensuring smooth startup without excessive noise and vibration.
Implementation Method 1
a field coil assembly which is magnetized when electric power is applied, and brings the disk into contact with the pulley
Data Source
AI summary
A variable displacement swash plate type compressor control method and a variable displacement swash plate type compressor controlled thereby may include a first determination step of determining whether liquid refrigerant exists within the variable displacement swash plate type compressor; a first operation step of applying power to the field coil assembly and of not applying current to the electronic control valve, when it is determined in the first determination step S1 that the liquid refrigerant exists; a second determination step of comparing an elapsed period of time of operating in the first operation step with a predetermined reference time; and a second operation step of maintaining the power applied in the first operation step to the field coil assembly and applying current to the electronic control valve when the elapsed period of time is greater than or equal to the reference time.