Compressor Oil Level Retention Using Dual-Mode Gas-Liquid Separation
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Solution Overview
Problem
Rolling rotor compressors are sensitive to wet compression, requiring a specific oil film to maintain lubrication, sealing, and cooling, and existing systems fail to maintain optimal oil levels, leading to damage and reduced efficiency.
Innovation Solution
An automatic oil level retention system with a gas-liquid separator, oil return auxiliary loop, and liquid level detection unit to monitor and control oil levels, ensuring appropriate lubrication and sealing by adjusting oil flow paths based on real-time conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long oil film sealing line is required for proper lubrication, sealing, and cooling, then excellent oil films are formed on compressor surfaces, but a high lubricating oil liquid level must be maintained which increases the risk of excessive oil entering the refrigeration system
Solution Approach 1:
The gas-liquid separator is divided into two chambers: a first chamber receiving refrigerant from the compressor and a second chamber receiving refrigerant from the evaporator. This segmentation allows independent oil level control in each chamber, enabling the first chamber to maintain higher oil level for sealing while the second chamber prevents excessive oil accumulation, thus resolving the contradiction between adequate oil sealing and preventing oil overload in the refrigeration system
Solution Approach 2:
An oil return auxiliary loop with an oil return electromagnetic valve acts as an intermediary mechanism between the two chambers. When the liquid level sensor detects high oil level in the first chamber, the valve opens to transfer excess oil to the second chamber, thereby maintaining optimal oil level for sealing while preventing excessive oil from entering the refrigeration system
2Productivity
If the lubricating oil liquid level is reduced to maintain refrigeration efficiency, then heat exchange efficiency is improved, but the lubricating system cannot work normally resulting in abrasion and overheating
Solution Approach 1:
The system dynamically adjusts oil distribution between the two chambers based on real-time liquid level detection. The oil return electromagnetic valve responds to liquid level sensor signals, continuously balancing oil levels to maintain the minimum required level for proper lubrication while allowing the system to operate efficiently, thus resolving the contradiction between heat exchange efficiency and lubricating system reliability
3Device complexity
If manual oil level monitoring is used, then system complexity is reduced, but the compressor cannot maintain optimal oil levels leading to damage and reduced efficiency
Solution Approach 1:
A liquid level sensor provides continuous feedback on the oil level in the first chamber of the gas-liquid separator. When the oil level drops below or rises above the optimal range, the sensor triggers the oil return electromagnetic valve to open or close, automatically adjusting oil flow to maintain the correct level. This feedback mechanism ensures reliable compressor operation without requiring complex manual monitoring systems
Solution Approach 2:
The system is designed to self-regulate oil levels through the automatic control loop consisting of the liquid level sensor, control unit, and oil return electromagnetic valve. The system monitors its own oil level and automatically corrects deviations without external intervention, maintaining optimal lubrication and sealing conditions while preventing damage, thus achieving high reliability with relatively simple device complexity
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
Maintains optimal oil levels, preventing damage and improving compressor reliability and efficiency by timely adjustment of oil flow, ensuring consistent lubrication and sealing.
Implementation Method 1
the liquid level detection unit is disposed in an inner cavity of the first gas-liquid separator and is configured to monitor lubricating oil liquid level conditions within the first gas-liquid separator in real time
Implementation Method 2
an outlet of the first gas-liquid separator is connected to the compressor body through a gas inlet pipe; an oil return hole of the low-pressure gas-liquid separator is connected to an inlet of the first gas-liquid separator through a gas return pipe
Implementation Method 3
the oil return auxiliary loop comprises an oil return pipe and an oil return electromagnetic valve disposed on the oil return pipe... on/off of the oil return auxiliary loop is correspondingly controlled according to the lubricating oil liquid level conditions monitored in real time
Implementation Method 4
an outlet of the first gas-liquid separator is connected to the compressor body through a gas inlet pipe... an inlet of the low-pressure gas-liquid separator is provided with an inlet pipe available for being connected by a preset refrigeration system
Data Source
Figure 1~2
Figure 3
AI summary
Automatic oil level retention system for a compressor and method for controlling a same, comprising: a normal oil return mode and an auxiliary oil return mode. When a lubricating oil liquid level monitored by a liquid level detection unit (7) in real time is above a required liquid level height, the system initiates only the normal oil return mode; and when the lubricating oil liquid level monitored by the liquid level detection unit (7) in real time is below the required liquid level height, the system initiates the auxiliary oil return mode, and the auxiliary oil return mode is closed and the normal oil return mode is initiated after the lubricating oil liquid level monitored in real time is lifted above the required liquid level height.