Controls and related methods for mitigating liquid migration and/or floodback
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Solution Overview
Problem
Conventional compressors in climate control systems face failures due to liquid migration and floodback issues, where refrigerant migrates to the coldest location or returns to the compressor, causing damage to components like main bearings and pistons, and existing solutions are either costly or unreliable.
Innovation Solution
Implementing a sensor-enabled control system that uses a combination of thermistors and optical level switches to detect liquid state and temperature, allowing for adaptive protection and control, such as customizable fault protection, discharge line temperature control, and suction line floodback protection, to prevent liquid migration and floodback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical regulators are used to protect against liquid migration and floodback, then protection is provided, but the cost is high and reliability is low
Solution Approach 1:
The patent replaces mechanical regulators with an electronic control system that uses optical sensors (non-mechanical) to detect liquid levels and electronic switching components to control compressor operation. This substitution eliminates the mechanical moving parts that caused reliability issues while providing more consistent and adjustable protection against liquid migration and floodback.
Solution Approach 2:
The patent introduces optical sensors as intermediary devices that detect the presence of liquid refrigerant without mechanical contact. These sensors act as mediators between the physical liquid state and the electronic control system, enabling precise detection and response to liquid migration conditions without the wear and failure modes of mechanical regulators.
2Reliability
If sensor-enabled control system is implemented to detect liquid state and temperature, then protection effectiveness is improved, but device complexity increases
Solution Approach 1:
The control system is designed to perform multiple functions: it detects liquid levels using optical sensors, monitors temperature via thermistors, controls compressor operation, and provides protection against both liquid migration and floodback. By consolidating these functions into a single integrated electronic control unit, the patent reduces overall system complexity despite adding sensing capabilities.
Solution Approach 2:
The control system automatically monitors system conditions and adjusts compressor operation without external intervention. The optical sensors and thermistors continuously detect liquid levels and temperatures, and the control system autonomously responds by adjusting compressor cycling or activating heating elements, eliminating the need for manual regulation or complex external control mechanisms.
3Measurement precision
If optical level switches and thermistors are used to detect liquid and temperature, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical level detection methods with optical level switches that use light transmission to detect liquid presence. This non-mechanical approach provides more precise measurement without the wear, friction, and mechanical failure modes of traditional level indicators, while the integrated electronic reading simplifies the overall detection system architecture.
Solution Approach 2:
The patent uses thermistors as intermediary sensing elements that convert temperature changes into electrical resistance changes, which are then read by the control system. This intermediary conversion provides precise temperature measurement without requiring direct mechanical or electrical contact with extreme temperature conditions, enhancing measurement accuracy while protecting the reading circuitry.
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 solution effectively mitigates liquid migration and floodback, reducing the risk of component damage, providing reliable and cost-effective protection compared to conventional mechanical regulators, with less external leakage propensity and improved reliability.
Implementation Method 1
an optical level switch (broadly, a liquid detection sensor) connected to a control
Implementation Method 2
a thermistor (broadly, a temperature sensor) and an optical level switch (broadly, a liquid detection sensor) connected to a control
Implementation Method 3
evaporate the liquid within about 10 minutes or other acceptable time interval
Data Source
AI summary
The present disclosure relates to controls and related methods for mitigating liquid (e.g., compressor refrigerant, etc.) migration and/or floodback.