Screw compressor and refrigeration system having it
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Solution Overview
Problem
Existing two-stage screw compressors have complex structures and numerous components, leading to high costs and inconvenient installation, necessitating a simplification of the internal structure to improve reliability and market competitiveness.
Innovation Solution
A screw compressor design featuring a rotor set with a pair of meshing male and female rotors and a partition plate that divides the rotor housing into low-pressure and high-pressure stages, reducing the number of components and simplifying the structure while maintaining efficient compression through a pair of meshing rotors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-stage single-machine screw compressor is adopted under high compression ratio conditions, then the compression efficiency is improved, but the device complexity increases due to complex structure and numerous components
Solution Approach 1:
The patent merges the low-pressure stage and high-pressure stage into a single integrated rotor housing, with the partition plate embedded directly into the grooves of the male and female rotors. This integration eliminates the need for separate housings and reduces the number of components while maintaining two-stage compression functionality, thereby improving compression efficiency without proportionally increasing device complexity.
Solution Approach 2:
The partition plate serves multiple functions simultaneously: it divides the rotor housing into low-pressure and high-pressure stages, acts as a structural support element, and is embedded into the rotor grooves to maintain sealing and compression. This multi-functionality reduces the need for additional components and simplifies the overall structure while achieving two-stage compression.
2Stress or pressure
If a two-stage single-machine screw compressor is adopted, then the compression ratio is improved, but the manufacturing cost increases due to complex structure and numerous components
Solution Approach 1:
By combining the low-pressure and high-pressure stages into a single rotor housing with an integrated partition plate, the patent reduces the total number of parts that need to be manufactured and assembled. This merging approach maintains the high compression ratio capability while reducing manufacturing complexity and associated costs.
Solution Approach 2:
The partition plate is designed with a segmented structure featuring a first annular section and a second annular section that are respectively embedded in the grooves of the male and female rotors. This segmentation allows for simplified manufacturing of individual components that can be easily assembled into the final product, reducing overall manufacturing cost while maintaining the required compression ratio.
3Productivity
If a two-stage single-machine screw compressor is adopted, then the compression performance is improved, but the installation convenience deteriorates due to complex structure
Solution Approach 1:
The integration of both compression stages into a single rotor housing with the partition plate embedded in the rotor grooves creates a more compact unit that requires fewer installation steps and less space. This merging approach maintains superior compression performance while improving installation convenience by reducing the number of separate components to be assembled.
Solution Approach 2:
The partition plate is nested within the rotor structure, with its first and second annular sections embedded into the grooves of the male and female rotors respectively. This nesting arrangement creates a compact, integrated design that simplifies installation while maintaining the two-stage compression performance, as the partition plate becomes an integral part of the rotor assembly rather than a separate component.
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 design achieves a simple and compact layout, improving compression efficiency, reducing manufacturing costs, and enhancing installation efficiency by using a pair of meshing rotors for two-stage compression, thereby addressing the complexity and cost issues of existing compressors.
Implementation Method 1
The gas is compressed through the volume change of the tooth space of the mutually meshing male and female rotors installed in parallel inside the rotor housing, causing periodic volume changes in the gas between the tooth space of the rotors
Implementation Method 2
a partition plate, fixed on the rotor housing, for dividing the rotor housing into a low-pressure stage housing and a high-pressure stage housing connected to each other
Data Source
AI summary
A screw compressor comprises: a rotor set comprising male rotor and female rotor meshing with each other; a rotor housing; and a partition plate, fixed on the rotor housing and having a first annular section and a second annular section. The annular outer surface diameter of the first annular section is the same or substantially the same as the diameter of the circle formed by the male rotor teeth tips. The annular inner surface diameter of the first annular section is the same or substantially the same as the male rotor main shaft diameter. The annular outer surface diameter of the second annular section is the same or substantially the same as the diameter of the circle formed by the female rotor teeth tips. The annular inner surface diameter of the second annular section is the same or substantially the same as the female rotor main shaft diameter.