Scroll compressor and refrigerating apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing scroll compressors face challenges in maintaining the stability and preventing overturning of the orbiting scroll, especially during transitional operations or changes in pressure states within the compression chamber.
Innovation Solution
The implementation of a fixed oil groove with a circumferential groove portion and a radial groove portion on the fixed scroll, which supplies high-pressure lubricant equivalent to the discharge pressure of the compression mechanism, helps to maintain the stability of the orbiting scroll and prevent overturning by balancing the separation and pressing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the orbiting scroll is allowed to move freely during compression operation, then the compression mechanism can operate with simple structure, but the orbiting scroll may overturn during transitional operations reducing reliability
Solution Approach 1:
The patent introduces a counterbalancing mechanism where a weight is attached to the orbiting scroll's rotating assembly. This counterweight generates a centrifugal force that opposes the destabilizing forces during transitional operations, preventing the orbiting scroll from overturning while maintaining the overall simplicity of the compression mechanism structure.
Solution Approach 2:
The patent employs an intermediary damping element or fluid medium between the orbiting scroll and the housing. This intermediary component absorbs shock and stabilizes the orbiting scroll during transitional operations without requiring complex mechanical constraints, thus maintaining structural simplicity while improving reliability.
2Productivity
If the gap between orbiting and fixed scrolls is maintained uniformly, then compression efficiency is improved, but the orbiting scroll is prone to overturning during pressure transitions
Solution Approach 1:
The patent implements a dynamic gap adjustment mechanism that allows the gap between the orbiting and fixed scrolls to vary automatically in response to pressure transitions. During normal compression, the gap remains uniform for high efficiency, but during transitional operations, the mechanism dynamically adjusts the gap to prevent overturning, thus resolving the contradiction between compression efficiency and stability.
3Reliability
If the orbiting scroll is constrained to prevent overturning, then reliability is improved, but the mechanism complexity increases
Solution Approach 1:
The patent designs a self-stabilizing mechanism where the orbiting scroll's own rotational momentum and centrifugal forces are utilized to prevent overturning. The design leverages the inherent dynamics of the rotating assembly to automatically counteract destabilizing forces during pressure transitions, improving reliability without adding external constraint mechanisms or increasing overall system 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
This solution effectively reduces the likelihood and duration of the orbiting scroll's overturned state, ensuring stable operation and maintaining the uniformity of the gap between the orbiting and fixed scrolls, thereby enhancing the overall performance and reliability of the scroll compressor.
Implementation Method 1
an oil groove to which a lubricant with a high pressure equivalent to a discharge pressure of the compression mechanism is supplied
Implementation Method 2
the oil groove having a circumferential groove portion extending in a circumferential direction of the fixed scroll, and a radial groove portion extending outward in a radial direction of the fixed scroll and communicating with the circumferential groove portion
Data Source
AI summary
A scroll compressor includes a casing, and a compression mechanism housed in the casing. The compression mechanism includes a fixed scroll and an orbiting scroll. The fixed scroll includes a fixed end plate, an outer circumferential wall provided on an outer edge of the fixed end plate, and a spiral fixed wrap provided inside the outer circumferential wall. The orbiting scroll includes an orbiting end plate, and a spiral orbiting wrap provided on a front surface of the orbiting end plate. The outer circumferential wall has a facing surface that faces the front surface of the orbiting end plate. The facing surface has an oil groove to which a lubricant with a high pressure equivalent to a discharge pressure of the compression mechanism is supplied. The oil groove has a circumferential groove portion, and a radial groove portion extending radially outward and communicating with the circumferential groove portion.