Piston Compressor Dual Suction Path Cooling and Oil Separation
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Solution Overview
Problem
In piston-type compressors, reducing the flow rate of working fluid into the crank chamber for effective centrifugal separation leads to inadequate cooling of internal parts and difficulty in removing abrasion powder generated by wear, which can cause adverse effects due to adhesion.
Innovation Solution
A piston-type compressor design featuring a first suction path that directly introduces working fluid into the suction chamber without the crank chamber and a second suction path with an oil separation passage and a bypass passage, parallel to each other, to increase the working fluid flow into the crank chamber while maintaining effective centrifugal separation and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow rate of working fluid into the crank chamber is reduced for effective centrifugal separation, then oil separation efficiency is improved, but cooling of internal parts becomes inadequate and abrasion powder removal becomes difficult
Solution Approach 1:
The suction path is segmented into two separate paths: a first suction path that introduces working fluid directly into the suction chamber without passing through the crank chamber, and a second suction path that introduces working fluid into the crank chamber for centrifugal separation. This segmentation allows the system to simultaneously achieve adequate cooling (through the first path) and effective oil separation (through the second path), resolving the technical contradiction between these two functions.
2Reliability
If the flow rate of working fluid into the crank chamber is reduced for effective centrifugal separation, then oil separation efficiency is improved, but abrasion powder removal becomes difficult
Solution Approach 1:
The suction path is divided into two segments: the first suction path provides sufficient working fluid flow to the suction chamber to carry away abrasion powder generated in the crank chamber, while the second suction path maintains adequate flow for centrifugal separation. This segmentation resolves the contradiction between achieving effective oil separation and preventing abrasion powder accumulation.
3Temperature
If working fluid is introduced directly into the suction chamber without passing through the crank chamber, then cooling effect is improved, but centrifugal separation function is weakened
Solution Approach 1:
The system segments the working fluid flow into two distinct paths: the first suction path introduces working fluid directly into the suction chamber to provide adequate cooling, while the second suction path directs working fluid through the crank chamber to enable centrifugal separation. This dual-path segmentation allows both cooling and separation functions to operate effectively simultaneously.
4Temperature
If working fluid flow through the shaft is increased for better cooling, then cooling effect is improved, but centrifugal separation becomes ineffective due to fast flow speed
Solution Approach 1:
The suction path is segmented into two independent paths: the first suction path provides sufficient working fluid flow to the crank chamber for effective cooling without compromising separation, while the second suction path maintains optimized flow conditions for centrifugal separation. This segmentation resolves the contradiction between cooling requirements and separation effectiveness.
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 design enhances the cooling of internal parts, reduces oil outflow, and effectively removes abrasion powder by ensuring sufficient working fluid flow and centrifugal separation, thereby improving the reliability of sliding parts and preventing oil adhesion issues.
Implementation Method 1
by making use of a centrifugal separating operation generated due to the rotation of the shaft, any oil in the working fluid which flows into the suction chamber from the crank chamber is separated
Data Source
AI summary
Provided is a piston type compressor which can enhance cooling of internal parts housed in a crank chamber, while effectively reducing an outflow of oil to the outside of a compressor by effectively performing a centrifugal separating operation due to the rotation of a shaft. The compressor includes: a first suction path which directly introduces a working fluid flowed from a suction port 30 into suction chambers 27a, 27b without via the crank chamber 7; and a second suction path which introduces the working fluid flowed from the suction port 30 into the suction chambers 27a, 27b via the crank chamber 7, and the second suction path includes: an oil separation passage 32 where a working fluid is introduced into the suction chambers 27a, 27b from the crank chamber 7 via holes formed in the shaft; and a bypass passage 33 where the working fluid is introduced into the suction chambers 27a, 27b from the crank chamber 7 through the cylinder blocks 1, 2 without via the shaft 12.