Scroll Compressor Injection Valve Assembly for Compact Sealing
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Solution Overview
Problem
Existing scroll compressors have limitations in discharge refrigerant amount, design flexibility, and packaging size due to complex injection valve assemblies and external fastening bolts, which hinder performance and efficiency improvements.
Innovation Solution
A scroll compressor design with a simplified, circular-shaped injection valve assembly that allows for port position adjustment and compactification by positioning the fastening bolt on the introduction chamber side, incorporating a gasket retainer for uniform sealing and reduced parts, and eliminating the need for additional O-rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex injection valve assembly with external fastening bolts is used, then the sealing reliability is improved, but the device complexity and packaging size increase
Solution Approach 1:
The patent merges the fastening function and sealing function into a single integrated structure. The fastening bolt is disposed inside the introduction chamber and directly fastens the injection valve assembly to the rear housing, eliminating the need for separate external fastening structures. The gasket retainer integrates the gasket holding function with the sealing function, creating a unified component that reduces overall assembly complexity while maintaining reliable sealing.
Solution Approach 2:
The fastening bolt is nested within the introduction chamber rather than being external to the assembly. This nesting approach allows the fastening mechanism to be contained within the existing structural boundaries, reducing the external footprint and packaging size while maintaining the fastening function. The injection valve assembly itself is nested between the rear housing and the fixed scroll, creating a compact layered structure.
2Ease of manufacture
If the fastening bolt is disposed outside the introduction chamber, then the assembly is easier to manufacture, but the packaging size increases
Solution Approach 1:
The fastening bolt is repositioned from an external radial arrangement to an internal axial arrangement within the introduction chamber. This dimensional repositioning allows the fastening function to be achieved within the existing volumetric boundaries of the compressor, eliminating the need for additional external space and reducing the overall packaging size while maintaining manufacturing simplicity.
3Productivity
If refrigerant at intermediate pressure is introduced to the compression chamber, then the refrigerant discharge amount increases, but the device complexity increases
Solution Approach 1:
The injection valve assembly is designed with multi-functionality to handle both the control valve and the injection flow path functions within a single integrated structure. The valve plate with through-holes serves both as a flow control mechanism and as an injection pathway, eliminating the need for separate complex components and reducing overall device complexity while enabling intermediate pressure refrigerant injection to increase discharge amount.
Data Source
AI summary
A scroll compressor capable of improving the performance and efficiency of the compressor by increasing the amount of refrigerant discharged from a compression chamber by introducing not only refrigerant at suction pressure but also refrigerant at an intermediate pressure to the compression chamber of the scroll compressor, capable of freely changing the position of a port by simplifying the shape of an injection valve assembly and by disposing a fastening bolt on an introduction chamber side, and capable of compactifying the injection valve assembly.