Scroll Compressor Injection Check Valve Layout for Low Dead Volume
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing compressors with injection mechanisms face issues of increased size, efficiency degradation, and higher costs due to the need for additional parts and complex assembly, which adversely affect their performance and reliability.
Innovation Solution
The compressor design incorporates an injection mechanism with an injection passage and check valve chamber formed on the involute extension angle of the fixed scroll, utilizing a long and thin check valve sandwiched between lid body openings, eliminating the need for additional blocks and reducing dead volume, while maintaining the fixed scroll's size, enhancing efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a block with injection pipe is assembled on the outer surface of the fixed scroll, then the injection mechanism can be implemented, but the fixed scroll size increases and assembly complexity increases
Solution Approach 1:
The injection passage is integrated directly into the fixed scroll body, merging the injection mechanism with the scroll structure. The check valve chamber is formed within the fixed scroll, eliminating the need for separate blocks and achieving a compact design without increasing overall size.
Solution Approach 2:
The fixed scroll serves multiple functions: it acts as the stationary scroll for compression and simultaneously houses the injection mechanism with check valve chamber and passages. This multi-functionality eliminates the need for separate injection mechanism components.
2Adaptability or versatility
If a conventional injection mechanism with separate block is used, then injection function is provided, but assembly complexity and part quantity increase
Solution Approach 1:
The injection mechanism components (injection passage, check valve chamber, check valve) are merged into a single integrated fixed scroll structure, reducing the number of separate parts and simplifying assembly operations.
Solution Approach 2:
The fixed scroll is designed to contain and support the injection mechanism internally, making the structure self-contained and eliminating the need for separate assembly of injection components onto the scroll.
3Productivity
If the check valve is made long and thin along the check valve chamber, then injection efficiency is improved, but the fixed scroll size must increase
Solution Approach 1:
The check valve is oriented along the radial direction of the fixed scroll, utilizing the radial dimension to achieve sufficient length for efficient injection flow. The check valve chamber is positioned to allow the check valve to extend radially from the injection passage toward the outer circumference, maximizing length within the available radial space without increasing overall scroll diameter.
4Adaptability or versatility
If additional blocks and parts are attached to the fixed scroll, then injection mechanism is complete, but manufacturing costs increase
Solution Approach 1:
The injection mechanism is merged into the fixed scroll as an integrated structure, reducing the total number of parts that need to be manufactured and assembled. This consolidation reduces manufacturing complexity and associated costs.
Solution Approach 2:
The fixed scroll is designed as a multi-functional component that performs both compression and injection functions, eliminating the need for separate injection mechanism parts and reducing overall part count and manufacturing cost.
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 allows for increased opening/closing stroke and smoother fluid flow without enlarging the compressor, reducing dead volume, and simplifying assembly, leading to a more efficient, reliable, and cost-effective compressor with improved injection efficiency and reduced parts costs.
Implementation Method 1
a valve sheet which becomes a check valve is sandwiched between the check valve chamber and the block
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A sheet-shaped check valve 23 which opens and closes the injection passage 21 is placed in the check valve chamber 22, an injection discharge passage 21b portion connected to the compression chamber 13 of the injection passage 21 and the check valve chamber 22 open from an outer surface of the fixed scroll 11, a lid body 25 is attached to openings of the injection discharge passage 21b and the check valve chamber 22 such that the check valve 23 is sandwiched between the openings and the lid body 25, and the injection discharge passage 21b and the check valve chamber 22 are hermetically closed, thereby forming the injection passage 21. According to this, it is possible to provide a reliable, efficient and inexpensive compressor with an injection mechanism.