Liquid detection system
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Solution Overview
Problem
Traditional refrigeration systems face inefficiencies and component wear due to the presence of liquid refrigerant in compressor suction sides, as existing detection methods, such as temperature and pressure measurements, are inaccurate and fail to prevent liquid entry during high-capacity operations.
Innovation Solution
A liquid detection system employing a thermal flow sensor within conduits to detect liquid refrigerant, which sends signals to a control system to adjust operating parameters, such as compressor speed and evaporator heat transfer, to reduce liquid presence and maintain efficient vapor compression cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional temperature and pressure measurement methods are used to detect liquid refrigerant, then the detection system is simple in structure, but the measurement precision is insufficient and fails to accurately detect liquid presence during high-capacity operations
Solution Approach 1:
The patent replaces traditional mechanical temperature and pressure measurement systems with a thermal flow sensor that uses thermal conduction principles to directly detect liquid refrigerant presence. The sensor measures heat transfer characteristics of the flowing refrigerant, where liquid refrigerant conducts heat differently than vapor, enabling accurate liquid detection without complex mechanical measurement systems.
2Productivity
If the refrigeration system operates at high capacity, then the productivity increases, but liquid refrigerant enters the compressor causing component wear and efficiency loss
Solution Approach 1:
The patent implements a feedback control system where the thermal flow sensor continuously monitors liquid refrigerant presence in real-time, and the control system adjusts operating parameters based on this feedback. When liquid detection exceeds a threshold during high-capacity operation, the system automatically reduces compressor speed or adjusts expansion valve positioning to prevent liquid entry, thereby protecting compressor reliability while maintaining high productivity.
Solution Approach 2:
The patent employs dynamic adjustment of system parameters based on real-time liquid detection. The compressor speed and expansion valve positioning are continuously adjusted according to the thermal flow sensor readings, allowing the system to operate at high capacity when conditions are favorable while dynamically reducing capacity when liquid presence becomes problematic, thus balancing productivity and reliability.
3Duration of action of moving object
If liquid refrigerant enters the compressor, then the system can maintain continuous operation, but the compressor efficiency decreases and component wear increases
Solution Approach 1:
The patent applies preliminary anti-action by detecting liquid refrigerant presence before it can enter the compressor and causing harm. The thermal flow sensor positioned in the suction line detects liquid accumulation in advance, triggering control actions that prevent liquid from reaching the compressor, thereby eliminating the harmful effects before they occur while maintaining continuous operation.
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 system effectively reduces liquid presence in conduits, enhancing compressor efficiency and preventing wear by accurately detecting liquid refrigerant and adjusting parameters in real-time, thereby maintaining system performance and extending component lifespan.
Implementation Method 1
A liquid detection system employs a thermal flow sensor within conduits to detect liquid refrigerant
Data Source
AI summary
The present disclosure relates to a sensor disposed in a conduit on a suction side of a compressor, wherein the conduit is configured to convey a fluid and a controller communicatively coupled to the sensor. The controller includes a processor and a memory, the memory is configured to store instructions to be performed by the processor, and the controller is configured to receive one or more indications from the sensor of an amount of power consumed by an active sensor component, determine a presence of liquid in the fluid based at least on the one or more indications, and control a device based on the presence of liquid in the fluid.