Rotary Compressor Discharge Opening Layout to Reduce Dead Volume
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Solution Overview
Problem
Conventional rotary compressors suffer from inefficiencies due to dead volume creation during refrigerant discharge, particularly because of the discharge guide groove, which lowers compressor efficiency and can cause over-compression and discharge loss.
Innovation Solution
The compressor design eliminates the discharge guide groove by forming a discharge opening that overlaps with the compression space, with a cross-sectional area ratio of non-overlapping portion being 0.1 or less, and having a width in the radial direction not exceeding 1.1 times the sealing thickness of the piston, allowing for efficient refrigerant discharge without additional dead volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a discharge guide groove is added to guide refrigerant to the discharge opening, then refrigerant discharge is improved, but dead volume increases and compressor efficiency decreases
Solution Approach 1:
The invention removes the discharge guide groove from the cylinder, extracting the harmful element that created dead volume. The discharge opening is repositioned and redesigned to function without the groove, eliminating the source of efficiency loss while maintaining discharge capability.
Solution Approach 2:
The discharge opening is repositioned from a conventional location to overlap with the compression space in a radial direction. This spatial reconfiguration allows refrigerant discharge without requiring the discharge guide groove, transforming the geometric arrangement to eliminate dead volume.
2Productivity
If the discharge opening area is increased to improve discharge capacity, then refrigerant flow is improved, but dead volume increases
Solution Approach 1:
The discharge opening is designed with non-uniform distribution - the area is concentrated in regions that overlap with the compression space while minimizing extension into dead volume zones. This local optimization allows sufficient discharge area without proportionally increasing dead volume.
Solution Approach 2:
The discharge opening utilizes radial overlap with the compression space rather than extending axially or circumferentially. This dimensional approach allows the discharge area to be embedded within the active compression zone, achieving high discharge capacity without proportional dead volume increase.
3Ease of manufacture
If the discharge opening is positioned far from the compression space to simplify structure, then manufacturing is easier, but connection passage dead volume increases
Solution Approach 1:
The discharge opening is merged with the compression space by positioning it to overlap radially with the cylinder bore. This integration eliminates the need for separate connection passages, as the discharge opening directly accesses the compression zone, thereby eliminating connection passage dead volume.
Solution Approach 2:
The discharge opening is positioned in radial overlap with the compression space rather than at a distant axial location. This spatial integration eliminates the need for intermediate connection passages while maintaining structural simplicity, as the discharge opening becomes part of the compression space geometry.
4Productivity
If the discharge opening width is increased to improve discharge area, then refrigerant flow is improved, but refrigerant leakage increases
Solution Approach 1:
The discharge opening width is optimized locally - sufficient width is provided in regions where refrigerant flow is needed while maintaining proper clearance from moving parts in critical sealing zones. This localized optimization achieves adequate discharge area without compromising sealing and preventing leakage.
Solution Approach 2:
The discharge opening width is designed with a specific ratio (0.05 to 0.15 times the cylinder inner diameter) that provides sufficient discharge area without excessive width. This partial action approach achieves the minimum required discharge capability while avoiding the harms of excessive width such as leakage and mechanical interference.
Data Source
AI summary
A compressor includes: a compression space with an annular shape comprising an inner circumferential surface and an outer circumferential surface; and a discharge opening formed in a direction parallel to a shaft direction of the compressor, to discharge a refrigerant compressed in the compression space, wherein a first portion of a cross-sectional area of the discharge opening overlaps a portion of a cross-sectional area of the compression space, a second portion of the cross-sectional area of the discharge opening does not overlap the cross-sectional area of the discharge opening, and the ratio of the non-overlapping second portion of the cross-sectional area of the discharge opening to the entire cross-sectional area of the discharge opening is 0.1 or less. With such a configuration, a dead volume generated in the compression space can be reduced, and thus compressor efficiency can be enhanced.