Compressor Oil Management via Annular Sleeve Flow Control
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Solution Overview
Problem
Existing compressors in refrigeration and air conditioning systems face performance and durability issues due to oil logging in the crank chamber, especially during liquid-fill start-up, high-temperature operation, and inadequate piston lubrication at high speeds, which are not adequately addressed by current oil management systems.
Innovation Solution
A variable displacement compressor design featuring a hollow housing with a suction chamber, cylinder block, and crankcase, including a rotatable driveshaft with fluid passageways and an annular sleeve that selectively opens and closes fluid flow paths to manage the flow of working and lubricating fluids, ensuring efficient lubrication and minimizing oil logging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oil separator is added to separate oil from refrigerant, then oil is maintained in the compressor, but package space increases due to additional external components
Solution Approach 1:
The patent integrates the oil separation function into the existing crank chamber by configuring the crank chamber with a sump at the bottom and utilizing the natural separation of oil and refrigerant vapor densities. The crank chamber serves dual purposes: as a lubrication reservoir and as an oil separator, eliminating the need for external oil separation components and reducing package space.
Solution Approach 2:
The crank chamber is designed to perform multiple functions simultaneously: storing lubricating oil, separating oil from refrigerant vapor, and providing a sump for oil collection. This multi-functional design eliminates the need for dedicated oil separation components, thereby reducing overall package space while maintaining effective oil management.
2Reliability
If the crank chamber stores oil, then oil is maintained in the compressor, but other operating conditions such as liquid-fill start-up, high-temperature operation, or inadequate piston lubrication at high speeds are not addressed
Solution Approach 1:
The patent employs a variable displacement mechanism that dynamically adjusts the compressor's operation based on system requirements. The driveshaft inclination angle can be varied to control refrigerant flow and pressure conditions, enabling the system to adapt to different operating scenarios including liquid-fill start-up, high-temperature operation, and high-speed conditions while maintaining adequate lubrication.
Solution Approach 2:
The system utilizes parameter changes in the refrigerant flow (pressure, temperature, velocity) and crank chamber conditions to address various operating conditions. By controlling the variable displacement mechanism, the system can modify operating parameters to ensure proper lubrication delivery under different conditions such as high-speed operation or liquid-fill start-up scenarios.
3Productivity
If a variable displacement mechanism is added to optimize performance, then compressor efficiency is maximized, but device complexity increases
Solution Approach 1:
The variable displacement mechanism is integrated into the existing compressor structure by utilizing the driveshaft inclination adjustment capability. The same driveshaft that provides the reciprocating motion also controls the displacement variation through its inclination angle, merging the displacement control function with the existing motion transmission system and avoiding additional complex mechanisms.
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
The design enhances compressor performance, efficiency, and durability while reducing manufacturing costs, weight, package size, and assembly time by effectively managing lubrication and preventing oil logging, thereby optimizing operational conditions.
Implementation Method 1
a first fluid flow path fluidly connecting the crank chamber to the suction chamber to facilitate a flow of a mixture of the working fluid and the lubricating fluid from the crank chamber to the suction chamber
Implementation Method 2
an annular sleeve slideably disposed between the driveshaft and the cylinder block, the annular sleeve selectively positionable to open and close the second fluid flow path
Data Source
AI summary
A compressor including a hollow housing having a suction chamber, a discharge chamber, and a crank chamber formed therein. A first fluid flow path provided within the compressor facilitates a flow of the working fluid from the crank chamber to the suction chamber. A second fluid flow path provided within the compressor facilitates a flow of a mixture of the working fluid and a lubricating fluid from the crank chamber to the suction chamber, wherein the second fluid flow path is selectively opened and closed by an annular sleeve.