Compressor Hinge-Protrusion Bearing Surface for Easier Machining
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Solution Overview
Problem
The machining of hinge protrusions in rotary compressors is difficult due to the need for high precision and complex angles, leading to increased costs and instability in the compressor's operation.
Innovation Solution
The hinge protrusion of the vane is designed with a bearing surface only on the front side, allowing for easier machining and improved precision, reducing interference and friction, and stabilizing the vane and rolling piston behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bearing surface of the hinge protrusion is formed with a circumferential angle of 180° or more to ensure stable operation, then the reliability of compressor operation is improved, but the manufacturing complexity and cost increase due to difficulty in positioning and machining
Solution Approach 1:
The patent applies local quality by forming the bearing surface only on the front side of the hinge protrusion rather than distributing it uniformly around the circumference. This localized approach concentrates the bearing function where it is most needed for stable operation while eliminating the need for complex machining of a full 180° or more circumferential surface, thereby resolving the contradiction between reliability and ease of manufacture
Solution Approach 2:
The patent employs asymmetry by positioning the bearing surface exclusively on the front side of the hinge protrusion, creating an asymmetric configuration rather than a symmetric circumferential distribution. This asymmetric design simplifies machining operations while maintaining the necessary stability for compressor operation, addressing both the reliability requirement and the manufacturing ease concern
2Productivity
If the bearing surface of the hinge protrusion is formed with a large circumferential angle to reduce interference between the rolling piston and vane, then the compression efficiency is improved, but the machining precision and cost are adversely affected
Solution Approach 1:
The patent applies local quality by concentrating the bearing surface function on the front side of the hinge protrusion rather than distributing it over a large circumferential angle. This localized bearing surface reduces interference between the rolling piston and vane to maintain compression efficiency while significantly simplifying the machining requirements and improving manufacturing precision
Solution Approach 2:
The patent extracts the essential bearing function from a potentially complex circumferential surface and concentrates it on the front side of the hinge protrusion. This extraction approach maintains the necessary interference reduction for compression efficiency while eliminating the need for high-precision machining of extensive circumferential surfaces
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 facilitates machining, reduces costs, and enhances compression efficiency by minimizing friction and leakage, resulting in stable operation of the compressor.
Implementation Method 1
a frictional loss may occur between the rolling piston and the vane
Implementation Method 2
reducing wear between a vane and a rolling piston
Implementation Method 3
a rolling piston which performs an eccentric rotary motion in a compression space of a cylinder
Implementation Method 4
a degree that the rolling piston and the vane are closely adhered to each other is closely related to compressor efficiency
Data Source
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AI summary
A compressor according to the present invention comprises a hinge recess formed at a rolling piston and a hinge protrusion formed at a vane to be inserted into the hinge recess. A diameter of the hinge protrusion is greater than an interval between both ends of an opening of the hinge recess. A bearing surface, which comes in contact with an inner circumferential surface of the hinge recess, of an outer circumferential surface of the hinge protrusion, has a circumferential surface below 90° at both sides, respectively, based on a central line in a lengthwise direction of the vane. This structure may facilitate for cutting and grinding the bearing surface so as to reduce a machining cost, and also improve a machining degree and thus stabilize behaviors of the rolling piston and the vane so as to enhance compression efficiency.