Scroll Compressor Lubricant Cooling and Precision Shell Alignment
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Solution Overview
Problem
Compressor machines, particularly scroll compressors, face challenges in achieving precise alignment of components due to the use of numerous discrete parts, which can lead to inaccuracies and increased manufacturing costs, while also requiring effective lubricant cooling to improve performance and reliability.
Innovation Solution
A compressor design featuring a single, unitarily formed shell with precision machined surfaces for component alignment and a heat exchanger system that cools the lubricant by transferring heat from the lubricant to expanded working fluid, facilitating efficient lubrication and alignment of moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If numerous discrete components are used to assemble the compressor, then the components can be manufactured separately, but the alignment accuracy and manufacturing cost deteriorate
Solution Approach 1:
The patent combines multiple discrete components (shell, bearing support, alignment surfaces) into a unitarily formed shell structure. This integration eliminates the need for separate manufacturing and assembly of these components, thereby ensuring precise alignment while maintaining manufacturing efficiency through unified production processes.
2Productivity
If lubricant is cooled before flowing back through the compressor, then volumetric efficiency and reliability improve, but the system complexity increases
Solution Approach 1:
The patent integrates the lubricant cooling function into the existing heat exchanger system already present in the compressor. By combining the cooling function with the heat exchanger that cools the refrigerant, the system achieves lubricant cooling without adding separate cooling equipment, thus maintaining system simplicity while improving volumetric efficiency.
Solution Approach 2:
The heat exchanger serves dual functions: cooling the refrigerant and cooling the lubricant. This multi-functionality allows the system to achieve lubricant cooling without requiring additional dedicated cooling components, thereby improving productivity without significantly increasing device complexity.
3Manufacturing precision
If a unitary shell with precision machined surfaces is used, then component alignment improves, but manufacturing complexity increases
Solution Approach 1:
The unitary shell is designed with segmented functional zones, each with precision machined surfaces for specific component alignments. By dividing the shell into functional segments (bearing support areas, alignment surfaces, mounting interfaces), the complex precision requirements are distributed across manageable sections, reducing overall manufacturing complexity while maintaining high alignment accuracy.
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 achieves precise alignment of compressor components, reduces manufacturing complexity and costs, and enhances performance by maintaining lubricant viscosity and cooling the suction gas, thereby improving volumetric efficiency and reliability.
Implementation Method 1
a heat exchanger that cools the lubricant by transferring heat from the lubricant to expanded working fluid
Implementation Method 2
transferred heat from the lubricant to expanded working fluid
Data Source
AI summary
An external heat exchanger is used to transfer heat from a compressor lubricant to an expanded working fluid, thereby cooling the lubricant. The heat exchanger may also be used to sub-cool condensed working fluid with the same flow of expanded working fluid. A horizontal scroll-type compressor includes an intermediate lubricant sump between a main bearing support and a scroll member. A counterweight on the crankshaft can travel through the lubricant in the intermediate sump to splash the lubricant around. A horizontal scroll-type compressor can include multiple machined surfaces that are utilized to precisely center and align components of the compressor.