Variable Pitch Screw Rotor Liquid Feed Range
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The liquid feed type screw compressor faces limitations in reducing stirring loss and expanding the installable range of the liquid feed port due to fixed minimum liquid feeding requirements and reduced design freedom in high-speed, miniaturized compressors.
Innovation Solution
The screw compressor design incorporates a screw rotor with a changing pitch from the suction end surface to the discharge end surface, allowing for an expanded installable range of the liquid feed mechanism and improved energy-saving performance by reducing stirring loss and increasing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the liquid feed port is approached to the discharge port to reduce stirring loss, then energy-saving performance is improved, but the installable range of the liquid feed port is limited
Solution Approach 1:
The patent changes the geometric parameter of the screw rotor by implementing a variable pitch design where the pitch changes in the axial direction from the suction end surface toward the discharge end surface. This parameter change modifies the pressure distribution characteristics along the axial direction, creating additional feasible positions for liquid feed port installation while maintaining the capability to reduce stirring loss
2Productivity
If the screw rotor or casing is miniaturized for high-speed operation, then productivity is improved, but the installable range of the liquid feed port is decreased
Solution Approach 1:
The variable pitch design changes the pressure distribution parameters along the axial direction, which compensates for the reduced space available in miniaturized compressors. By optimizing the pitch variation, the invention creates sufficient pressure differential zones that allow liquid feed port installation even in compact high-speed compressor designs
3Quantity of substance
If a sufficiently large pressure difference is set between main liquid feeding pressure and operating chamber pressure to satisfy required liquid feeding amount, then liquid feeding performance is improved, but the installable range of the liquid feed port is limited
Solution Approach 1:
The variable pitch screw rotor design modifies the pressure distribution parameters along the axial direction, creating multiple zones with different pressure characteristics. This allows selection of liquid feed port positions that naturally provide sufficient pressure differential for required liquid feeding amounts, expanding the installable range beyond conventional fixed-pitch designs
Data Source
AI summary
This screw compressor is provided with a screw rotor, a casing accommodating the screw rotor, and a liquid feed mechanism for feeding a liquid into an operating chamber enclosed by the casing, wherein the pitch of the screw rotor changes in the axial direction from a suction end surface toward a discharge end surface.