Scroll compressor and refrigeration apparatus
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Solution Overview
Problem
The movable oil groove in existing scroll compressors does not communicate with the fixed oil groove in a specific angle range of the orbiting motion, limiting the supply of lubricant to the facing surfaces, necessitating an increase in lubrication performance.
Innovation Solution
The design incorporates a fixed oil groove with a circumferential groove portion and a wide portion in the radial direction, and a movable oil groove with a circumferential and radial groove portion, allowing for increased communication and lubricant supply through a wide portion during the orbiting motion of the movable scroll.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the movable oil groove does not communicate with the fixed oil groove in a specific angle range, then the structure is simple, but the lubricant supply amount to the facing surfaces is insufficient
Solution Approach 1:
The fixed oil groove is segmented into multiple portions: a first circumferential groove portion, a first radial groove portion, a second circumferential groove portion, and a second radial groove portion. This segmentation allows the lubricant to be supplied through multiple pathways, increasing the total lubricant supply amount to the facing surfaces while maintaining a relatively simple overall structure.
Solution Approach 2:
The invention transitions from a single circumferential groove to a multi-dimensional groove system that includes both circumferential and radial portions. By adding the radial dimension to the groove structure, the oil supply pathway is extended, allowing lubricant to reach the facing surfaces more effectively and increasing the communication angle between the movable and fixed oil grooves.
2Reliability
If the communication angle between movable and fixed oil grooves is limited, then the manufacturing is easier, but the lubrication performance is insufficient
Solution Approach 1:
The fixed oil groove is divided into multiple segmented portions (first circumferential, first radial, second circumferential, second radial groove portions). This segmentation enables the lubricant to be supplied through multiple discrete pathways, increasing the total communication angle between the movable and fixed oil grooves, thereby improving lubrication performance while keeping each individual groove portion relatively simple to manufacture.
Solution Approach 2:
Different portions of the fixed oil groove have different orientations and functions. The circumferential portions provide continuous oil supply along the rotation direction, while the radial portions extend the oil supply toward the facing surfaces. This local differentiation of groove quality and orientation maximizes the communication angle and lubrication effectiveness.
3Quantity of substance
If a single circumferential groove is used, then the structure is simple, but the lubricant distribution to facing surfaces is insufficient
Solution Approach 1:
The single circumferential groove is segmented into multiple portions including first and second circumferential groove portions, first and second radial groove portions, and wide portions. This segmentation creates multiple lubricant supply pathways that work together to increase the total lubricant distribution amount to the facing surfaces while maintaining a manageable structural complexity.
Solution Approach 2:
The invention merges circumferential and radial groove portions into a unified fixed oil groove structure. This combination allows the lubricant to flow both circumferentially along the rotation direction and radially toward the facing surfaces, effectively increasing lubricant distribution through the integrated groove system.
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 enhances lubricant distribution to the facing surfaces of the fixed and movable scrolls, improving lubrication performance by enlarging the angle range of communication between the oil grooves and ensuring adequate lubrication across the facing surfaces.
Implementation Method 1
a wide portion (84) wider in a radial direction than a groove width of the circular-arc portion, wherein in a predetermined region of an angle range where the movable scroll (70), when the scroll compressor is in operation, makes an orbiting motion, a portion of the radial groove portion (87) overlaps the wide portion (84) as viewed from an axial direction
Implementation Method 2
a high-pressure lubricant is supplied to the fixed oil groove. An orbiting motion of the movable scroll causes the movable oil groove to communicate with the fixed oil groove. Thus, the lubricant in the fixed oil groove is supplied to the movable oil groove
Implementation Method 3
An orbiting motion of the movable scroll causes the movable oil groove to communicate with the fixed oil groove. Thus, the lubricant in the fixed oil groove is supplied to the movable oil groove
Data Source
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AI summary
A fixed oil groove (80) is provided on a facing surface of a fixed scroll (60) which faces a movable scroll (70). The fixed oil groove (80) has a fixed circumferential groove portion (81). A wide portion (84) of the fixed circumferential groove portion (81) is wider in a radial direction than a circular-arc portion of the fixed circumferential groove portion (81). The movable oil groove (85) is provided on the facing surface of the movable scroll (70) which faces the fixed scroll (60). In a predetermined region of an angle range where the movable scroll (70) makes an orbiting motion, a portion of a radial groove portion (87) of the movable oil groove (85) overlaps the wide portion (84) as viewed from the axial direction.