Scroll Compressor Sealing Rings for Leakage Prevention
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Solution Overview
Problem
Existing scroll type compressor sealing arrangements face challenges with leakage during cranking and high compression ratios, and assembly difficulties lead to reliability issues and increased production costs.
Innovation Solution
A scroll type compressor with an enhanced sealing arrangement featuring a housing, bracket body, partition block, scrolls, gliding block, and U-shaped sealing rings, where the gliding block forms multiple air chambers and the sealing rings are designed with specific dimensions to minimize leakage and facilitate assembly, ensuring effective pressure regulation and reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single air chamber with a gliding block is used to seal between high-pressure and low-pressure chambers, then pressure buildup is improved, but leakage occurs during cranking when compression ratio is low
Solution Approach 1:
The patent divides the single air chamber into multiple air chambers (first air chamber, second air chamber, third air chamber) with corresponding gliding blocks (first gliding block, second gliding block). Each gliding block independently seals its respective chamber interface. This segmentation allows each gliding block to respond to local pressure conditions, ensuring reliable sealing during both cranking (low compression ratio) and normal operation (high compression ratio) without the leakage problems of a single-chamber design.
2Reliability
If additional spring force is added to push the gliding block, then leakage during cranking is reduced, but the gliding block cannot move downward when compression ratio is high
Solution Approach 1:
The patent employs multiple gliding blocks that can dynamically move up and down based on real-time pressure conditions in their respective chambers. During cranking, pressure differences cause the gliding blocks to move upward to seal leaks. During high compression ratio operation, the blocks automatically move downward to relieve load. This dynamic response eliminates the need for fixed spring forces that would restrict motion in either direction.
Solution Approach 2:
The multiple gliding blocks self-regulate their positions based on pressure differential forces acting on them. Each gliding block automatically moves to the appropriate position (upward during cranking to prevent leakage, downward during high compression to relieve load) without requiring external spring assistance or control mechanisms. The system uses the process itself (pressure variations) to control the sealing action.
3Reliability
If a gliding block and O ring combination is assembled into the receiving chamber, then sealing is improved, but assembly becomes difficult and the O ring is vulnerable to damage
Solution Approach 1:
The patent extracts the O ring from the vulnerable position where it would be pinched between the gliding block and receiving chamber during assembly. Instead, the sealing function is achieved through the precisely fitted gliding blocks that directly contact the chamber walls. This eliminates the assembly difficulty and O ring damage risk while maintaining effective sealing between the air chambers.
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
The enhanced sealing arrangement effectively prevents leakage, simplifies the assembly process, and enhances the reliability and efficiency of the compressor by ensuring proper pressure build-up and load regulation, even at varying compression ratios.
Implementation Method 1
the friction between the side walls of the sealing rings and the chamber is larger than the downward force of the gliding block when the compression ratio is high
Implementation Method 2
By providing pressure variations in these air chamber, the gliding block can be forced to glide
Data Source
AI summary
A scroll type compressor with an enhanced sealing arrangement includes two sealing rings, mounted one between a first part of a gliding block and a first chamber of a fixed scroll and another one between a second part of the gliding block and a second chamber of the fixed scroll, respectively. The sealing ring has a U-shape cross section characterized in having a center depth smaller than half of a total height of the cross section. By providing such sealing rings, damage in mounting the sealing rings can be reduced to a minimum, possible leakage from the damage can be avoided, the assembly process in producing the compressor can be improved, and the compressor can be successfully merchandized.