Scroll Compressor Oil Stirring Arrangement for Startup Lubrication
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Solution Overview
Problem
Conventional scroll compressors face high manufacturing costs and lubrication issues during initial startup due to insufficient oil distribution, which can harm reliability and lifetime.
Innovation Solution
Incorporating a lubrication system with oil reservoirs and stirring elements in the circular receiving cavities to ensure proper lubrication of the inner and outer circumferential bearing surfaces, utilizing centrifugal effect for oil distribution and stirring within the oil reservoirs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spaces are arranged in the central region of the orbital discs to store oil, then lubrication at compressor start is improved, but manufacturing costs significantly increase
Solution Approach 1:
The invention extracts the oil storage function from the orbital disc structure and relocates it to the circular receiving cavity in the support arrangement. This separation allows the orbital disc to remain simple while the support arrangement provides centralized oil storage, significantly reducing manufacturing complexity and cost while maintaining reliable lubrication at startup.
Solution Approach 2:
The invention merges the oil storage function with the support arrangement structure by forming oil reservoirs within the circular receiving cavities. This integration eliminates the need for separate oil storage components in the orbital discs, simplifying the overall structure and reducing manufacturing costs while ensuring oil availability for lubrication.
2Reliability
If lubrication passages and grooves are formed in the bottom surfaces of the orbital discs, then oil supply to bearing surfaces is improved, but manufacturing costs increase
Solution Approach 1:
The invention removes the oil supply function from the orbital disc structure and transfers it to the support arrangement. The circular receiving cavities in the support arrangement serve as both structural supports and oil reservoirs, eliminating the need for complex lubrication passages and grooves in the orbital discs, thereby reducing manufacturing costs while maintaining reliable oil supply.
3Reliability
If not sufficient amount of oil is present in all spaces arranged in the central region of the orbital discs, then lubrication issues occur at initial compressor startup, but adding more oil storage spaces increases device complexity
Solution Approach 1:
The invention consolidates multiple small oil storage spaces in the orbital discs into a single centralized oil reservoir system in the support arrangement. This centralized reservoir, formed by the circular receiving cavities, ensures sufficient oil is available for all orbital discs simultaneously, guaranteeing consistent lubrication across all bearing surfaces without increasing structural complexity.
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
Enhances the reliability and lifetime of the scroll compressor by ensuring effective lubrication of the bearing surfaces, particularly during startup, reducing the risk of surface damage and improving overall performance.
Implementation Method 1
utilizing centrifugal effect for oil distribution and stirring within the oil reservoirs
Data Source
AI summary
The scroll compressor (1) includes a fixed scroll (7); an orbiting scroll (8); a support arrangement (5) including a thrust bearing surface (9) on which is slidably mounted the orbiting scroll (8); a rotation preventing device configured to prevent rotation of the orbiting scroll (8) with respect to the fixed scroll (7), the rotation preventing device including a plurality of orbital discs (28) respectively rotatably mounted in circular receiving cavities (29) provided on the support arrangement (5), each orbital disc (28) being provided with an outer circumferential bearing surface (31) configured to cooperate with an inner circumferential bearing surface (32) provided on the respective circular receiving cavity (29); and a lubrication system configured to lubricate the inner and outer circumferential bearing surfaces (32, 31) with oil supplied from an oil sump (36), the lubrication system including a plurality of oil reservoirs (43) each arranged in a bottom surface of a respective circular receiving cavity, and a plurality of oil stirring arrangements each configured to stir oil contained in a respective oil reservoir (43).