Scroll Compressor Chamfered Corners Leakage Control
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Solution Overview
Problem
The existing scroll compressor design lacks a defined dimensional relationship between the chamfered portions of the spiral blades, leading to increased gaps and refrigerant gas leakage, resulting in higher leakage loss.
Innovation Solution
The design incorporates specific chamfered portions on both the fixed and orbiting scrolls, ensuring a matching shape and size at opposing ends, with a configuration where the combined sectional area of the chamfered spaces is less than 1×10−4 times the compression chamber area, minimizing the gap between the spiral blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If chamfered portions are formed at the distal end portion of the spiral blade of the orbiting scroll and at the bottom portion of the spiral blade of the fixed scroll, then the compression chamber can be formed, but the gap between the distal end portion of the spiral blade and the bottom portion of the spiral blade increases causing increased refrigerant gas leakage
Solution Approach 1:
The patent applies local quality by forming chamfered portions with specific dimensional relationships at critical locations (distal end portion of orbiting scroll spiral blade and bottom portion of fixed scroll spiral blade) to locally control the gap size. The chamfered portions are designed with precise dimensions so that when they contact each other, the gap is minimized only at the critical leakage location while maintaining the overall compression chamber volume.
2Loss of substance
If the gap between the distal end portion of the spiral blade and the bottom portion of the spiral blade is reduced to prevent leakage, then refrigerant gas leakage decreases, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by establishing specific dimensional relationships for the chamfered portions, particularly defining the contact dimension between the chamfered portion at the distal end of the orbiting scroll spiral blade and the chamfered portion at the bottom of the fixed scroll spiral blade. By controlling the contact dimension to be within a specific range (0.01 to 0.05 times the compression chamber width), the gap is minimized to prevent leakage while the dimensional relationships are designed to be manufacturable with standard precision.
3Ease of manufacture
If the chamfered portions are designed with larger dimensions to simplify manufacturing, then ease of manufacture improves, but the gap between the spiral blades increases causing higher leakage loss
Solution Approach 1:
The patent applies parameter changes by defining the contact dimension of the chamfered portions within a specific range (0.01 to 0.05 times the compression chamber width). This parameter specification allows for straightforward manufacturing while ensuring the gap is sufficiently small to prevent significant refrigerant gas leakage. The dimensional relationship provides a balance between manufacturability and leakage prevention.
Data Source
AI summary
A scroll compressor includes a first chamfered portion formed at a distal end portion of a spiral blade of a fixed scroll, a second chamfered portion formed at a distal end portion of a spiral blade of an orbiting scroll, a third chamfered portion formed at a bottom portion of the spiral blade of the fixed scroll, and a fourth chamfered portion formed at a bottom portion of the spiral blade of the orbiting scroll. An expression of 0<{(Av1+Av2)/2}/Ac<1×10−4 is satisfied where a sectional area of a space between the first chamfered portion and the fourth chamfered portion is defined as Av1, a sectional area of a space between the second chamfered portion and the third chamfered portion is defined as Av2, and a sectional area of a compression chamber is defined as Ac.