Scroll Compressor Balancing Space Oil Management
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Solution Overview
Problem
The open scroll compressor experiences issues with oil agitation leading to increased noise and leakage, due to the balancing space design which results in high oil overflow and weakened supporting force for the orbiting scroll, along with a larger and heavier main frame, and complications in centering operations.
Innovation Solution
The design incorporates an oil discharge hole on the main frame to direct oil into the compression chambers, reducing oil flow into the balancing space, and a sub frame with a balancing space that accommodates a larger balance weight to enhance supporting force, while minimizing the main frame's size and weight, and facilitating centering operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the balancing space is designed to accommodate the balance weight, then the supporting force for the orbiting scroll is improved, but oil overflow increases causing agitation loss and noise
Solution Approach 1:
The balancing space is segmented into an upper portion and a lower portion by a partition wall. The upper portion accommodates the balance weight while the lower portion receives oil from the suction space, preventing oil from entering the balance weight area and reducing agitation loss and noise.
Solution Approach 2:
A partition wall acts as an intermediary structure between the balance weight and oil flow paths. This partition wall directs oil flow to a specific area away from the balance weight, eliminating direct contact between oil and the balancing space, thus reducing agitation loss and noise while maintaining supporting force.
2Force
If the main frame size is increased to provide structural support, then the supporting force is improved, but the compressor becomes larger and heavier
Solution Approach 1:
The main frame employs local quality optimization by concentrating structural support at critical locations (such as the thrust surface area) rather than uniformly increasing the entire frame structure. This allows adequate supporting force while minimizing overall material usage and weight.
Solution Approach 2:
The support structure utilizes the axial dimension effectively by positioning the thrust surface and balancing space in the axial direction, allowing compact radial dimensions and reduced overall frame size while maintaining sufficient supporting force through optimized axial load distribution.
3Device complexity
If the balancing space is positioned away from the axial center, then the structure is simplified, but the supporting force for the central portion of the orbiting scroll is weakened causing axial leakage
Solution Approach 1:
The balancing space is positioned asymmetrically in the upper portion away from the axial center, simplifying the overall structure. However, a thrust surface is provided at the axial center to maintain supporting force and prevent axial leakage, combining structural simplicity with functional effectiveness.
Solution Approach 2:
The balancing space structure is segmented into an upper portion for balance weight accommodation and a lower portion for oil reception. This segmentation allows the balancing space to be positioned away from the center while the thrust surface remains at the axial center, preventing axial leakage despite the offset balancing space position.
4Productivity
If the scatter hole is positioned high to allow oil collection, then oil collection efficiency is improved, but oil easily flows into the balancing space causing noise
Solution Approach 1:
The balancing space is segmented by a partition wall into upper and lower portions. The scatter hole can be positioned in the lower portion where oil collects, maintaining collection efficiency, while the partition wall prevents oil from reaching the balance weight in the upper portion, eliminating noise.
Solution Approach 2:
The partition wall serves as an intermediary barrier between the oil collection area (lower portion) and the balance weight area (upper portion). This allows the scatter hole to be positioned for optimal oil collection while the partition wall intercepts oil flow before it can enter the balancing space and cause agitation noise.
Data Source
AI summary
A scroll compressor is provided, in which a balancing space may be formed on a sub frame to accommodate at least one balance weight, and an oil discharge hole may be formed on a main frame, thereby suppressing, all from being introduced into or remaining in the balancing space to minimize agitation loss due to oil agitation in the balancing space, and forming a thrust surface of the main frame adjacent to an axial center of the drive shaft to suppress axial leakage at a central portion of the orbiting scroll, reducing a size of the main frame to reduce a total weight of the compressor, facilitating a centering operation of the sub frame, and suppressing an outer diameter of the sub frame from being increased, thereby accomplishing miniaturization of the scroll compressor.