Reciprocating Compressor Vapor Injection System
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Solution Overview
Problem
Conventional reciprocating compressors lack a fluid-injection system, limiting their capacity and energy efficiency in refrigeration systems, as they rely primarily on blocked-suction modulation and variable-speed drives for energy management.
Innovation Solution
Incorporation of a vapor-injection system that selectively injects intermediate-pressure vapor into the compressor to reduce the work required to elevate the pressure of the vapor to discharge pressure, enhancing both capacity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional reciprocating compressors operate without a fluid-injection system, then the device complexity remains low, but the compressor capacity and energy efficiency are limited
Solution Approach 1:
The patent introduces an intermediate-pressure vapor injection system that acts as a mediator between the suction port and compression chamber. The injection valve selectively introduces intermediate-pressure vapor during the suction stroke to assist compression, thereby increasing compressor capacity without requiring a complete system redesign. This intermediary mechanism resolves the contradiction by adding a targeted functional element rather than overhauling the entire compressor architecture.
Solution Approach 2:
The system performs preliminary action by pre-compressing vapor to intermediate pressure before injection into the compression chamber. This intermediate compression step reduces the work required during the main compression stroke, effectively increasing overall compressor capacity. The preliminary compression occurs in a separate injection chamber, allowing the main compressor to operate more efficiently.
2Use of energy by moving object
If blocked-suction modulation is used to control compressor capacity, then energy consumption is reduced during low demand, but the compressor capacity remains limited and cannot be significantly increased
Solution Approach 1:
The patent implements a dynamic capacity control system where the injection valve can be selectively opened or closed based on system demand. When opened, intermediate-pressure vapor is injected to increase capacity; when closed, the system operates in standard mode with lower energy consumption. This dynamic adaptability allows the compressor to optimize between energy efficiency and capacity based on real-time refrigeration system needs.
Solution Approach 2:
The system changes operational parameters by introducing intermediate-pressure vapor at controlled rates and timings during the suction stroke. By adjusting the injection pressure, temperature, and timing, the system can achieve different capacity levels while maintaining efficient operation. This parameter control allows the compressor to exceed its standard capacity limits without proportionally increasing energy consumption.
3Loss of energy
If intermediate-pressure vapor is injected into the compression chamber, then the work required to elevate vapor pressure to discharge pressure is reduced, but the device complexity increases due to additional injection components
Solution Approach 1:
The patent segments the compression process into two distinct stages: an initial compression stage in the injection chamber that handles intermediate-pressure vapor, and a final compression stage in the main compression chamber. This segmentation allows each stage to be optimized for its specific pressure range, reducing the total work required. The injection valve and associated components are designed as modular elements that can be integrated without completely redesigning the compressor architecture.
Solution Approach 2:
The injection system is nested within the existing compressor structure, with the injection chamber and valve mechanism integrated into the compression cycle. The intermediate-pressure vapor injection occurs during the suction stroke, utilizing the existing piston motion and chamber volumes. This nesting approach minimizes additional complexity by leveraging the existing compressor infrastructure rather than adding entirely separate systems.
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 vapor-injection system reduces energy consumption and increases compressor capacity by allowing intermediate-pressure vapor to assist in the compression process, thereby optimizing energy use and performance.
Implementation Method 1
a vapor-injection system that selectively introduces intermediate-pressure vapor into the compressor to reduce the work required to elevate a pressure of the vapor to discharge pressure
Implementation Method 2
a first compression piston disposed within the first compression cylinder that compresses a vapor disposed within the first compression cylinder
Data Source
AI summary
A compressor assembly is provided and may include a first compression cylinder, a first compression piston disposed within the first compression cylinder that compresses a vapor disposed within the first compression cylinder, and a crankshaft that cycles the first compression piston within the first compression cylinder. The compressor assembly may additionally include a first control piston moveable between a first state restricting passage of intermediate-pressure fluid into the first compression cylinder and a second state permitting passage of intermediate-pressure fluid into the first compression cylinder.