Scroll Compressor Multi-Step Oil Grooves for Bearing Wear Control
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Solution Overview
Problem
Existing scroll compressors face issues with friction loss and wear on the bearing surface due to insufficient centrifugal force in the oil supply groove, which can either reduce oil supply or cause damage to the oil film, leading to inefficiencies in lubrication.
Innovation Solution
The scroll compressor design includes a rotating shaft with multiple oil supply grooves spaced apart in the axial direction, forming a multi-step structure to enhance centrifugal force and prevent invasion into the oil film pressure section, ensuring consistent oil supply without damaging the oil film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the inclination or length of the oil supply groove is increased to improve oil supply to the bearing surface, then the oil supply amount increases, but the oil supply groove may invade the oil film pressure section and cause damage to the oil film, leading to friction loss or wear on the bearing surface
Solution Approach 1:
The bearing surface is divided into two distinct zones: an oil supply groove section and an oil film pressure section. The oil supply groove is designed to extend only to a predetermined position that does not invade the oil film pressure section, effectively segmenting the functional areas. This segmentation allows sufficient oil supply to the bearing surface through the inclined oil supply groove while preventing damage to the oil film in the pressure section, thereby resolving the contradiction between oil supply amount and bearing surface integrity.
2Productivity
If the inclination of the oil supply groove is increased to enhance centrifugal force for better oil supply, then oil supply efficiency improves, but the risk of invading the oil film pressure section increases, causing friction loss or wear
Solution Approach 1:
The oil supply groove is designed with a specific inclination angle optimized for generating centrifugal force to improve oil supply efficiency. The groove is configured to extend only to a predetermined position that prevents invasion into the oil film pressure section. This local quality design ensures that the inclined groove provides sufficient centrifugal force for effective oil distribution while maintaining the integrity of the oil film in the pressure section, thus preventing friction loss and wear.
3Area of stationary object
If the oil supply groove is extended to cover more bearing surface area, then lubrication coverage improves, but the groove may severely invade the oil film pressure section, causing damage to the oil film and bearing surface
Solution Approach 1:
The bearing surface is segmented into distinct functional zones: the oil supply groove section and the oil film pressure section. The oil supply groove is designed to extend to a predetermined position that provides adequate lubrication coverage in the supply section without invading the pressure section. This segmentation enables sufficient lubrication coverage area while preserving oil film integrity in the pressure section, preventing damage and ensuring reliable operation.
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 configuration effectively reduces friction loss and wear on the bearing surface by optimizing oil supply, maintaining efficient lubrication and extending the lifespan of the compressor components.
Implementation Method 1
the oil passage is eccentric by a preset distance or inclined by a preset angle with respect to a center of the rotating shaft so that centrifugal force is generated in the oil passage when the rotating shaft rotates
Implementation Method 2
an inclination (inclination angle) of the oil supply groove or a length of the oil supply groove may not be sufficiently secured in consideration of an oil film on the bearing surface. This may reduce the centrifugal force in the oil supply groove, which may interfere with a smooth supply of the oil of the oil passage to the bearing surface
Data Source
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AI summary
A scroll compressor is disclosed. The scroll compressor may include an oil supply hole (1255) penetrating from an oil passage (1253) to an outer circumferential surface of a rotating shaft (125), and an oil supply groove (1256) communicating with the oil supply hole and formed along the outer circumferential surface of the rotating shaft. The oil supply groove may be provided in plurality axially spaced apart by a preset distance. This can prevent the oil supply groove from invading an oil film section and increase centrifugal force against oil in the oil supply groove, thereby suppressing friction loss and wear between a main frame and the rotating shaft.