Compressor Discharge Port Segmentation for Dead Volume Reduction
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Solution Overview
Problem
Conventional piston-type compressors face issues with 'dead volume' and pressure loss due to residual compressed fluid, leading to reduced volumetric efficiency and delayed valve opening, despite attempts to optimize discharge port shapes.
Innovation Solution
The compressor features a discharge port with a recessed portion and a through portion of smaller sectional area, where the recessed portion is formed to a specific depth and the through portion opens into the compression chamber, ensuring a large exit opening area without an enlarged diameter portion, reducing dead volume and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the discharge port diameter is increased to reduce pressure loss and valve opening delay, then pressure loss and valve opening delay are decreased, but dead volume increases
Solution Approach 1:
The discharge port is divided into two distinct sections: a first discharge port section with a larger diameter near the exit end to reduce pressure loss and valve opening delay, and a second discharge port section with a smaller diameter near the compression chamber to minimize dead volume. This segmentation allows each section to optimize for its specific function without compromising the other.
Solution Approach 2:
Different sections of the discharge port are assigned different diameters based on local requirements. The exit end section has a larger diameter to reduce flow resistance and pressure loss, while the section near the compression chamber has a smaller diameter to minimize dead volume. This local differentiation resolves the contradiction between pressure loss reduction and dead volume minimization.
2Loss of time
If the discharge port diameter is increased to reduce valve opening delay, then valve opening delay is decreased, but dead volume increases
Solution Approach 1:
The discharge port is segmented into a first section with larger diameter near the exit end to reduce valve opening delay through lower flow resistance, and a second section with smaller diameter near the compression chamber to minimize dead volume. This segmentation allows the valve to open more quickly while preventing excessive dead volume accumulation.
Solution Approach 2:
The discharge port exhibits local quality variation with a larger diameter at the exit end to reduce flow resistance and accelerate valve opening, and a smaller diameter at the compression chamber end to minimize dead volume. This local differentiation simultaneously addresses both valve opening delay and dead volume issues.
3Ease of manufacture
If the discharge port assumes a uniform diameter to simplify structure, then manufacturing is easier, but dead volume cannot be fully reduced
Solution Approach 1:
The discharge port is segmented into two sections with different diameters: a first section with larger diameter near the exit end and a second section with smaller diameter near the compression chamber. This segmentation reduces dead volume while remaining manufacturable through standard machining processes, balancing complexity reduction with performance improvement.
Solution Approach 2:
The discharge port employs local quality differentiation with a larger diameter at the exit end and a smaller diameter at the compression chamber end. This design reduces dead volume while maintaining ease of manufacture through conventional machining techniques, avoiding the need for complex manufacturing processes.
Data Source
AI summary
A compressor that allows a discharge port to assume a large circumference and a large area at an exit end thereof so as to optimize the discharge resistance and the pressure-receiving area and assuring improved volumetric efficiency through reduced dead volume, includes a discharge port 5b, an entrance end of which opens into a compression chamber and an exit end that is able to open and shut with a discharge valve 43. The discharge port 5b is constituted with a recessed portion 50 formed to achieve a predetermined depth from the exit end and a through portion 51 having a smaller sectional area than the sectional area of the recessed portion 50. The through portion 51 is formed so that its width measured along a direction perpendicular to the longitudinal direction of the discharge valve is greater than its width measured along the longitudinal direction of the discharge valve 43.