Single-Rotor Two-Stage Screw Compressor to Reduce Size and Complexity
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Solution Overview
Problem
Existing screw compressors with two-stage compression mechanisms require a long total length of screw rotors, increasing the compressor size and number of components, making them bulky and complex for two-stage compression.
Innovation Solution
A screw compressor design featuring a single screw rotor and multiple gate rotors, which reduces the size and component count by using a cylindrical wall with slits for fluid circulation and sealing, allowing two-stage compression with a simpler configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional two-stage compression mechanism with separate low-stage and high-stage screw rotors is used, then two-stage compression is achieved, but the total length of screw rotors increases and the number of components increases
Solution Approach 1:
The patent combines the low-stage and high-stage compression functions into a single screw rotor structure. The screw rotor includes both low-stage screw grooves and high-stage screw grooves, eliminating the need for separate low-stage and high-stage screw rotors. This merging reduces the number of components while maintaining two-stage compression capability, directly resolving the technical contradiction between achieving two-stage compression and reducing device complexity.
2Power
If a conventional two-stage compression mechanism with coaxially arranged screw rotors is used, then two-stage compression is achieved, but the compressor size increases
Solution Approach 1:
The patent merges the low-stage and high-stage compression functions into a single screw rotor, reducing the axial length required for two-stage compression. By having both low-stage and high-stage screw grooves on one rotor that meshes with a single gate rotor, the compressor size is reduced compared to conventional designs that require coaxially arranged separate rotors.
Solution Approach 2:
The patent utilizes the radial dimension by having the single screw rotor with both low-stage and high-stage screw grooves arranged radially. This allows two-stage compression to occur within a compact axial space by exploiting the radial arrangement of compression chambers, effectively reducing the compressor's overall size.
3Power
If a conventional two-stage compression mechanism is used, then two-stage compression is achieved, but the configuration becomes bulky
Solution Approach 1:
The patent combines multiple compression stages into a single rotor-gate rotor assembly, creating a more compact and streamlined configuration. The single screw rotor with integrated low-stage and high-stage screw grooves meshes with one gate rotor, eliminating the bulky appearance of multiple separate rotor assemblies while maintaining two-stage compression functionality.
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 enables efficient two-stage compression with reduced size and complexity, enhancing the compressor's operational efficiency and ease of assembly while minimizing fluid circulation and damage to gate rotors.
Implementation Method 1
a first compression chamber in which a fluid introduced into the casing at a suction pressure is compressed to an intermediate pressure higher than the suction pressure, and a second compression chamber in which the fluid at the intermediate pressure is compressed to a discharge pressure higher than the intermediate pressure
Data Source
AI summary
A screw compressor includes a screw rotor having a plurality of screw grooves, a plurality of gate rotors each including gates that mesh with the screw rotor, and a casing. The screw rotor is rotatably inserted in the casing. The casing has a cylindrical wall through which the gates pass. The screw compressor has a plurality of compression chambers inside the cylindrical wall. The plurality of compression chambers are defined by the screw rotor and the gates. The compression chambers include a first compression chamber and a second compression chamber. A fluid introduced into the casing at a suction pressure is compressed to an intermediate pressure higher than the suction pressure in the first compression chamber. The fluid at the intermediate pressure is compressed to a discharge pressure higher than the intermediate pressure in the second compression chamber.