Scroll Compressor Step Design for Suction Volume Optimization
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Solution Overview
Problem
Existing scroll compressors face inefficiencies in volumetric efficiency and refrigerating capacity due to temperature differences in suction volume parts, leading to decreased refrigerant density and overheating, which affects the cooling and lubrication of mechanical parts.
Innovation Solution
The design enhances volumetric efficiency and refrigerating capacity by creating a larger suction volume part near the suction port, increasing the number of turns of one scroll, and incorporating step parts on the scrolls to optimize refrigerant suction and cooling performance, while ensuring effective lubrication of mechanical parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suction path is made longer to cool and lubricate mechanical parts, then cooling and lubrication effects are improved, but refrigerant gas overheating increases and density decreases
Solution Approach 1:
The suction path is segmented into two separate suction volume parts (first and second suction volume parts) with different path lengths. The first suction volume part has a shorter suction path for high-density refrigerant suction, while the second suction volume part has a longer suction path for cooling and lubricating mechanical parts, resolving the contradiction between cooling effectiveness and refrigerant density maintenance
Solution Approach 2:
Different regions of the compressor are assigned different functional qualities: the first suction volume part is optimized for high-density refrigerant intake with minimal path length, while the second suction volume part is optimized for mechanical part cooling and lubrication with extended path length. This local differentiation allows each region to perform its specific function optimally without compromising the other
2Reliability
If the winding finish end of the scroll lap is extended to prevent liquid compression, then oil and liquid refrigerant suction is prevented, but volumetric efficiency and refrigerating capacity improvement is not expected
Solution Approach 1:
The scroll compressor is divided into two suction volume parts with different scroll lap configurations. The first suction volume part uses a scroll lap with fewer turns optimized for volumetric efficiency and refrigerating capacity, while the second suction volume part uses a scroll lap with extended turns optimized for preventing liquid compression. This segmentation allows both functions to be performed simultaneously without compromise
Solution Approach 2:
Instead of extending the scroll lap turns excessively for all suction volume parts (which would prevent liquid compression but reduce volumetric efficiency), the invention applies partial extension only to the second suction volume part. The first suction volume part maintains optimal turn count for high productivity, while the second suction volume part uses extended turns specifically for reliability purposes
3Productivity
If the suction volume part near the suction port is made larger, then high-density refrigerant suction is improved, but the other suction volume part may have insufficient cooling and lubrication capacity
Solution Approach 1:
The suction system is segmented into two independent suction volume parts with different volumes and functions. The first suction volume part near the suction port has a larger volume for high-density refrigerant suction and improved productivity, while the second suction volume part has a smaller volume specifically dedicated to cooling and lubricating mechanical parts, ensuring both productivity and reliability requirements are met simultaneously
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 configuration allows for efficient suction of high-density refrigerant, improving displacement, volumetric efficiency, and refrigerating capacity, while securing the service life and performance of the compressor through enhanced cooling and lubrication of mechanical parts.
Implementation Method 1
the refrigerant gas is heated by coming into contact with mechanical parts such as a bearing and a turning drive section in the middle of the suction path. It is possible to cool and lubricate the mechanical parts
Implementation Method 2
moving the suction volume parts from an outer peripheral side toward a center side while respective volumes thereof are decreased, to compress low-pressure refrigerant gas sucked into the suction volume part to high pressure
Data Source
AI summary
In a scroll compressor that forms two suction volume parts by engaging paired fixed scroll and turning scroll with each other while scroll laps respectively erected on end plates of the fixed scroll and the turning scroll are opposed to each other and driving the turning scroll to revolve around the fixed scroll, out of the two suction volume parts, one of the suction volume parts that is formed close to a suction port provided in a housing is made larger than the other suction volume part.