Sliding Block Guide Geometry for Non-Sinusoidal Compressor Stroke
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Solution Overview
Problem
Double-piston compressors with sliding block guides exhibit regular sinusoidal piston stroke curves, which can limit efficiency due to inherent design constraints, leading to fixed amplitude and stroke width, and increased wear and resistance.
Innovation Solution
The design modifies the sliding block guide by altering the alignment and contour of the parallel sliding block tracks, allowing for a non-sinusoidal piston stroke curve with increased amplitude and phase shifts, and incorporating features like arc-shaped indentations and curved tracks to optimize piston movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sliding block tracks are designed as straight parallel lines perpendicular to the piston rod axis, then the structure is simple and manufacturing is easy, but the piston stroke curve becomes a regular sinusoid with fixed amplitude and stroke width
Solution Approach 1:
The sliding block tracks are designed with curved contours instead of straight lines, specifically incorporating arc-shaped indentations and curved sections that guide the piston through a non-sinusoidal stroke path. This curvature modification allows the piston to achieve variable amplitude motion while maintaining manageable manufacturing complexity through standardized curved profile fabrication
2Productivity
If the sliding block tracks are modified to produce non-sinusoidal stroke curves, then piston movement efficiency and amplitude are improved, but the manufacturing complexity and alignment precision requirements increase
Solution Approach 1:
The sliding block guide incorporates localized curved indentations and modified track sections at specific positions rather than requiring the entire track to be complex. This allows the piston stroke curve to be optimized in critical regions while maintaining simpler geometry in other areas, reducing overall manufacturing precision requirements while still achieving improved piston movement efficiency
3Productivity
If the piston stroke amplitude is increased through design modifications, then compression efficiency improves, but wear and resistance on the sliding block tracks increases
Solution Approach 1:
The sliding block track design incorporates periodic variations in curvature and indentation patterns that correspond to the compression cycle. These periodic modifications optimize the piston velocity and acceleration profiles during different phases of compression, improving overall efficiency while distributing mechanical stresses more evenly to reduce wear on the sliding block tracks
Data Source
AI summary
A compressor includes a low pressure stage having a low pressure cylinder, a high pressure stage having a high pressure cylinder, a low pressure piston guided in an axially movable manner in the low pressure cylinder, a high pressure piston guided in an axially movable manner in the high pressure cylinder, a piston rod rigidly connecting the low pressure piston and the high pressure piston, and a sliding block guide. The sliding block guide includes a recess arranged in the piston rod and further includes two substantially parallel sliding block tracks. One of the sliding block tracks has an arc-shaped indentation in a central portion. The sliding block tracks are constructed and such that a movement of the low pressure piston and of the high pressure piston follows a piston stroke curve that deviates from a regular sinusoidal stroke curve.