Adjustable Discharge Port Control for Variable-Volume Screw Compressors
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Solution Overview
Problem
Current screw compressors face inefficiencies due to fixed volume ratios, leading to over- or under-compression, which increases power consumption and noise, and reduces efficiency, as they cannot adjust to changing operating conditions or refrigeration demands.
Innovation Solution
A variable-efficiency screw compressor system with an adjustable discharge port piston that changes volume in response to demand, allowing for continuous adjustment of the volume ratio to match operating conditions, thereby optimizing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed volume ratio is used in screw compressors, then the structure is simple and reliable, but the compressor cannot adapt to changing operating conditions, leading to over- or under-compression and reduced efficiency
Solution Approach 1:
The patent applies the dynamics principle by making the discharge port volume adjustable through a movable piston that can be positioned at different locations along the discharge port. This allows the compressor to dynamically adapt its volume ratio to changing operating conditions and refrigeration demands, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The patent changes the physical parameter of discharge port volume by moving the piston to different positions. This parameter change enables the compressor to optimize its volume ratio for different operating conditions, improving adaptability while maintaining a relatively simple structural design through a single adjustable parameter.
2Productivity
If the discharge port volume is increased, then the volume ratio decreases and efficiency improves under low demand, but the compressor may under-compress and fail to meet high demand requirements
Solution Approach 1:
The movable piston creates a dynamic system where the discharge port volume can be adjusted in real-time based on demand conditions. This resolves the contradiction by allowing the compressor to optimize for efficiency under low demand while maintaining the capability to meet high demand requirements through piston repositioning.
3Loss of energy
If the volume ratio is not optimized, then power consumption increases and noise increases, but optimizing for one condition creates inefficiency under other conditions
Solution Approach 1:
By changing the discharge port volume parameter through piston movement, the compressor can optimize its volume ratio to minimize power consumption and noise under different operating conditions. This resolves the contradiction between energy efficiency and adaptability by enabling parameter optimization for each specific operating scenario.
Data Source
AI summary
A variable-efficiency screw compressor for use in a closed-loop system configured to perform refrigeration is provided. The variable-efficiency screw compressor includes an inlet port to draw refrigerant into the variable-efficiency screw compressor, one or more rotating screws in fluid communication with the inlet port to compress the refrigerant, forming a compressed refrigerant, a discharge port in fluid communication with the rotating screws to receive the compressed refrigerant and discharge the refrigerant, wherein the discharge port includes an adjustable piston movable within the discharge port from a first position in which volume is higher to a second position in which volume is lower, the adjustable piston arranged and disposed to adjust volume of the discharge port in response to a change in demand.