Rotary Compressor Piston and Vane Chamfer Design
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Solution Overview
Problem
In rotary compressors, reducing clearances between components to prevent refrigerant leakage and improve efficiency leads to abnormal wear and decreased lubricant oil feeding, resulting in deteriorated compression performance and reliability.
Innovation Solution
The rotary compressor design includes specific clearance and chamfer dimensions for the piston and vane, ensuring appropriate lubricant supply and sealing, with the piston and vane clearances and chamfers optimized to prevent excessive wear and leakage, enhancing refrigerant compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the clearance between the piston and the end plate and the clearance between the vane and the end plate are extremely small, then refrigerant leakage is suppressed and compression efficiency is improved, but abnormal wear is generated in sliding portions and reliability deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for piston clearance (0.02-0.05mm) and vane clearance (0.015-0.04mm) to optimize the balance between sealing performance and wear prevention. These parameter changes resolve the contradiction by defining the optimal clearance values that simultaneously improve compression efficiency while preventing abnormal wear.
2Productivity
If all of the clearance between the piston and the end plate, the clearance between the vane and the end plate, and the chamfer between the piston and the vane are reduced, then refrigerant leakage is suppressed, but the feeding amount of lubricant oil to the compressing unit decreases and compression performance deteriorates
Solution Approach 1:
The patent defines specific parameter ranges for clearances and chamfers that optimize both sealing and lubricant oil feeding. The piston outer circumferential chamfer (0.005-0.02mm) and vane ridge line chamfer (0.003-0.01mm) are carefully controlled to maintain lubricant oil supply paths while minimizing refrigerant leakage, resolving the contradiction between compression efficiency and lubricant oil feeding amount.
3Productivity
If the clearance between the piston and the end plate and the clearance between the vane and the end plate are extremely small, then refrigerant leakage is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies practical parameter ranges (piston clearance: 0.02-0.05mm, vane clearance: 0.015-0.04mm) that achieve high compression efficiency while remaining manufacturable. These parameter changes resolve the contradiction by defining clearance values that are small enough to prevent refrigerant leakage but large enough to be manufactured with conventional precision.
Data Source
AI summary
An upper piston of a rotary compressor is formed to satisfy 0.7×Hcy1/1000≤δro≤1.2×Hcy1/1000, Cro1≤0.1, Cro2≤0.1, and Cro1×Cro2≤0.007. Here, Cro1 indicates a length (mm) of an upper side piston outer circumferential chamfer portion in a height direction, and Cro2 indicates a length (mm) of the upper side piston outer circumferential chamfer portion in a normal line direction of a piston outer circumferential surface. An upper vane is formed to satisfy 0.7×Hcy1/1000≤δv≤1.2×Hcy1/1000, Cv1≤0.06, Cv2≤0.06, and Cv1×Cv2≤0.003. Here, Cv1 indicates a length (mm) of an upper side vane ridge line chamfer portion in a height direction, and Cv2 indicates a length (mm) of the upper side vane ridge line chamfer portion in a normal line direction of a vane tip end surface.