Two-stage compressor
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Solution Overview
Problem
Current two-stage compressors fail to effectively lubricate different compression mechanisms with varying oil requirements using the same lubrication method, leading to suboptimal lubrication efficiency.
Innovation Solution
A two-stage compressor design featuring a casing with separate compression chambers and an oil tank, where the oil tank is located in the second compression chamber, allowing for different lubrication methods between the first and second compression mechanisms. The compressor outputs an oil and refrigerant gas mixture to a separator, which separates and distributes lubricant oil accordingly, with the first mechanism receiving direct lubrication and the second mechanism receiving nebulized oil for improved lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same lubricating manner is used for both compression mechanisms, then the structure is simple, but the lubricating effect cannot be improved and different oil requirements cannot be satisfied
Solution Approach 1:
The compression system is segmented into two independent compression chambers (first and second compression chambers), each equipped with its own lubrication system. The first compression chamber receives lubricant from the oil separator, while the second compression chamber has a dedicated oil tank, allowing each mechanism to be lubricated independently according to its specific requirements.
Solution Approach 2:
Different lubrication qualities are applied to different compression mechanisms based on their specific needs. The first compression mechanism receives lubricant through a standard lubrication path, while the second compression mechanism receives nebulized lubricant sprayed from the oil tank, ensuring each mechanism gets the appropriate lubrication quality for its operational requirements.
2Reliability
If different lubricating manners are used for different compression mechanisms, then the lubricating effect is improved, but the device complexity increases
Solution Approach 1:
The lubrication systems for both compression mechanisms are merged into a single integrated structure. The oil tank is positioned within the second compression chamber and serves both chambers: lubricant is supplied to the first compression chamber and simultaneously stored in the oil tank for the second compression chamber, reducing overall system complexity while maintaining different lubrication methods.
Solution Approach 2:
The oil tank in the second compression chamber serves multiple functions: it stores lubricant for the second compression mechanism, acts as a nebulization chamber for creating lubricant spray, and is integrated into the overall compression system structure. This multi-functionality reduces the need for separate dedicated components for each lubrication system.
3Quantity of substance
If more lubricant oil is supplied to satisfy the screw compression mechanism, then the screw mechanism is adequately lubricated, but the scroll compression mechanism receives excessive oil
Solution Approach 1:
The lubrication system employs dynamic control where the second compression mechanism actively stirs the lubricant in the oil tank to create nebulization. This dynamic process ensures that the scroll compression mechanism receives lubricant in a controlled spray form rather than as bulk liquid, preventing oil accumulation while ensuring adequate lubrication coverage.
Solution Approach 2:
The physical state and delivery method of lubricant are changed for each compression mechanism. The first compression mechanism receives lubricant in its liquid form, while the second compression mechanism receives lubricant in a nebulized spray form. This parameter change in lubricant delivery state ensures appropriate lubrication quantity for each mechanism type.
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 lubrication of two compression mechanisms with different oil amounts, enhancing lubrication efficiency and meeting the unique needs of each mechanism.
Implementation Method 1
the oil separator separates lubricant oil or refrigerant gas from the oil and refrigerant gas mixture
Implementation Method 2
the oil separator separates lubricant oil or refrigerant gas from the oil and refrigerant gas mixture
Implementation Method 3
the second compression mechanism stirs the lubricant oil in the oil tank to nebulize the lubricant oil
Data Source
AI summary
A two-stage compressor includes a casing, a first compression mechanism and a second compression mechanism. The casing has a first compression chamber, a second compression chamber and an oil tank, wherein the first compression chamber communicates with the second compression chamber and the oil tank is located in the second compression chamber. The first compression mechanism is disposed in the first compression chamber. The second compression mechanism is disposed in the second compression chamber and the second compression mechanism corresponds to the oil tank. The first compression mechanism and the second compression mechanism consume different amounts of lubricant oil respectively.