Two-Stage Compressor Oil Tank Layout for Differential Lubrication
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Solution Overview
Problem
Current two-stage compressors fail to effectively lubricate different compression mechanisms with varying oil requirements, as they often use the same lubrication method for both, leading to suboptimal performance.
Innovation Solution
A two-stage compressor design featuring a casing with separate compression chambers and an oil tank, where the second compression mechanism extends into the oil tank to nebulize lubricant oil, allowing for different lubrication amounts and methods for each mechanism, with the second mechanism consuming less oil than the first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same lubrication method is used for both compression mechanisms, then the lubrication system is simple, but the lubrication effect cannot be improved and oil consumption cannot be optimized
Solution Approach 1:
The lubrication system is segmented into two independent parts: a first lubrication system for the first compression mechanism and a second lubrication system for the second compression mechanism. The second compression mechanism extends into the oil tank to access lubricant directly, while the first compression mechanism receives lubricant through a separate supply path. This segmentation allows each mechanism to receive appropriate lubrication independently, improving the overall lubrication effect without requiring a completely complex system redesign.
Solution Approach 2:
Different lubrication methods are applied to different locations based on their specific needs. The second compression mechanism, which requires less lubricant, directly accesses oil from the oil tank by extending into it. The first compression mechanism, which requires more lubricant, receives lubricant through a dedicated supply path. This local differentiation of lubrication quality and quantity optimizes the lubrication effect for each mechanism while avoiding excessive oil consumption.
2Reliability
If more lubricant oil is supplied to satisfy the first compression mechanism, then the first mechanism is adequately lubricated, but the second mechanism suffers from excessive oil affecting its operation
Solution Approach 1:
The lubrication supply is segmented into separate paths: the first compression mechanism receives lubricant through a first supply path from the lubricant supply, while the second compression mechanism accesses lubricant directly from the oil tank by extending into it. This segmentation ensures that each mechanism receives the appropriate amount of lubricant for its specific needs, preventing excessive oil from affecting the second mechanism's operation while maintaining adequate lubrication for the first mechanism.
Solution Approach 2:
Different quantities and methods of lubrication are applied locally to each compression mechanism based on their specific requirements. The second compression mechanism, which requires less lubricant, obtains oil directly from the oil tank in controlled amounts. The first compression mechanism receives more lubricant through the dedicated supply path. This local differentiation eliminates the harmful effect of excessive oil on the second mechanism while ensuring adequate lubrication for the first mechanism.
3Productivity
If the screw rotor extends into the oil tank to nebulize lubricant oil, then lubrication efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The second compression mechanism serves multiple functions: it compresses refrigerant gas as its primary function, and simultaneously acts as a lubricant nebulizer by extending into the oil tank. As the second compression mechanism operates, it stirs and nebulizes the lubricant oil, creating fine oil mist that efficiently lubricates both the second mechanism itself and the first compression mechanism. This multi-functionality improves lubrication efficiency without requiring a separate nebulizing device, thereby avoiding additional structural complexity.
Solution Approach 2:
The lubrication function is merged with the compression function of the second compression mechanism. Instead of having a separate lubrication delivery system, the second compression mechanism itself is designed to extend into the oil tank and perform both compression and lubricant nebulization. This merging of functions simplifies the overall structure by eliminating the need for separate lubrication delivery components while maintaining high lubrication efficiency.
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 design enables simultaneous satisfaction of different lubrication needs for both compression mechanisms, improving lubrication efficiency and preventing excessive oil from affecting the operation of the second mechanism.
Implementation Method 1
When the second compression mechanism is operating, the second compression mechanism stirs the lubricant oil to nebulize the lubricant oil
Data Source
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AI summary
A two-stage compressor (10) includes a casing (100), a first compression mechanism (102) disposed in a first compression chamber (1000) of the casing (100) and a second compression mechanism (104) disposed in a second compression chamber (1000) of the casing (100) . The casing (100) has an oil tank (1004), wherein the first compression chamber (1000) communicates with the second compression chamber (1002) and the oil tank (1004) is located in the second compression chamber (1002). The second compression mechanism (104) corresponds to the oil tank (1004). The first compression mechanism (102) and the second compression mechanism (104) consume different amounts of lubricant oil respectively.