Scroll Compressor Communication Hole Segmentation
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Solution Overview
Problem
Conventional scroll compressors face challenges in machining the pressure control hole in the movable scroll's mirror plate, requiring small inner diameters and long lengths, which leads to time-consuming processes and machining blade damage, due to the need to prevent communication between adjacent compression chambers and adjust pressure effectively.
Innovation Solution
A scroll compressor design featuring a communication hole with a large-diameter section on the back pressure chamber side and a small-diameter section extending to the compression chamber, allowing for improved workability by using different machining blades for each section and potentially incorporating a tubular communication member to avoid surface exposure and simplify machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a small-diameter hole is formed to communicate the back pressure chamber and compression chamber while preventing communication between adjacent compression chambers, then pressure control precision is improved, but machining difficulty increases and productivity decreases
Solution Approach 1:
The hole is divided into two distinct sections: a first hole section with a first diameter and a second hole section with a second diameter. This segmentation allows each section to be optimized for its specific function - the smaller second hole section maintains pressure control precision while the larger first hole section facilitates easier machining and oil return flow.
Solution Approach 2:
Different diameter sections are provided at different locations within the hole. The first hole section has a larger diameter suitable for machining and oil flow, while the second hole section has a smaller diameter for precise pressure control. This local quality variation resolves the contradiction between machining ease and pressure control precision.
2Manufacturing precision
If a long hole is formed through the mirror plate to communicate the back pressure chamber and compression chamber, then pressure control effectiveness is improved, but machining time increases and blade damage risk increases
Solution Approach 1:
The long hole is segmented into two diameter sections, allowing the machining process to use larger diameter blades for the first hole section and smaller diameter blades for the second hole section. This reduces machining time and blade damage risk while maintaining the overall length needed for effective pressure control.
Solution Approach 2:
The hole diameter parameter is changed along its length, with the first hole section having a larger diameter and the second hole section having a smaller diameter. This parameter variation optimizes both machining efficiency and pressure control effectiveness.
3Device complexity
If a single-diameter hole is used for both oil return and pressure control, then device complexity is reduced, but functional performance deteriorates
Solution Approach 1:
The hole is segmented into functional sections with different diameters. The first hole section with larger diameter facilitates oil return flow, while the second hole section with smaller diameter provides precise pressure control. This segmentation maintains functional performance while keeping the overall structure relatively simple.
Solution Approach 2:
Different sections of the hole have different diameter qualities suited to their specific functions. The larger first hole section optimizes for oil flow, while the smaller second hole section optimizes for pressure control, achieving reliable dual functionality without excessive 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 design enhances the workability of forming the communication hole by allowing the use of thicker blades for larger sections and thinner blades for smaller sections, reducing machining time and preventing unwanted communication between compression chambers, while ensuring effective pressure control.
Implementation Method 1
a communication hole communicating the back pressure chamber and the compression chamber with each other
Data Source
AI summary
[Problem] A scroll compressor is provided which has improved workability when a back pressure chamber and a compression chamber are communicated with each other.[Solution] A scroll compressor 1 includes a back pressure chamber 39 formed in a back surface of a mirror plate 31 of a movable scroll 22 in the scroll compressor 1, and a communication hole 51 which is formed in the mirror plate 31 of the movable scroll 22 and communicates the back pressure chamber 39 and a compression chamber 34 with each other. The communication hole 51 is constituted of a large-diameter hole section 52 located on the back pressure chamber 33 side of the mirror plate 31 of the movable scroll 22, and a small-diameter hole section 53 which continues from the large-diameter hole section 52 to reach the compression chamber 34.