Piston Compressor Valve Head Geometry for Higher Flow Area
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Solution Overview
Problem
Existing piston compressors face challenges in optimizing the flow area of suction and discharge valve sections, leading to higher dead volumes and reduced volumetric and isentropic efficiencies due to the use of reed valves, which are difficult to design with effective flow areas without increasing dead volume.
Innovation Solution
The implementation of a valve arrangement with a frustopyramidal or frustoconical suction valve section and a perpendicular discharge valve section, incorporating self-actuated check valves and finger blades to enhance fluid communication without significantly increasing dead volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reed valves are used in the suction valve section, then the compressor can operate reliably, but the flow area is limited and dead volume increases
Solution Approach 1:
The suction valve section is designed with a frustopyramidal or frustoconical shape instead of a conventional cylindrical form, utilizing the lateral surfaces of the truncated pyramid/cone to provide additional valve mounting areas. This geometric transformation increases the effective flow area without proportionally increasing the dead volume, as the tapered shape allows better space utilization.
Solution Approach 2:
The suction valve section is divided into multiple lateral faces (typically 4-6 faces) on the frustopyramidal structure, with individual check valves or finger blades positioned on each face. This segmentation allows the working fluid to enter through multiple distributed ports across the lateral surfaces, increasing the total effective flow area while maintaining compact overall dimensions.
2Productivity
If larger flow area is provided for suction and discharge valves, then volumetric efficiency improves, but dead volume increases
Solution Approach 1:
By transforming the suction valve section into a frustopyramidal or frustoconical geometry, the invention utilizes the slanted lateral surfaces to provide additional valve mounting areas. This allows the effective flow area to increase while the overall volume occupied by the valve section increases less proportionally, thereby improving volumetric efficiency without excessive dead volume penalty.
Solution Approach 2:
The frustopyramidal shape concentrates the flow area enhancement at specific locations (the lateral faces) where the check valves or finger blades are positioned, rather than uniformly increasing the volume throughout the entire valve section. This localized quality improvement allows better flow characteristics with minimized dead volume.
3Ease of manufacture
If conventional cylindrical suction valve section is used, then manufacturing is simple, but flow area optimization is limited
Solution Approach 1:
The invention transitions from a conventional cylindrical suction valve section to a frustopyramidal or frustoconical shape. This geometric change can be achieved through standard machining operations such as facing and angular cutting, making the manufacturing process relatively simple while dramatically increasing the available lateral surface area for valve placement and fluid flow.
Data Source
AI summary
A valve arrangement is for a piston compressor, the valve arrangement having: a suction valve section; and a discharge valve section; wherein the suction valve section and discharge valve section together form a working chamber head section, and the suction valve section has a frustopyramidal form.