Enthalpy Injection Valve Control to Prevent Compressor Liquid Entrainment
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Solution Overview
Problem
Existing air conditioner control methods for ultra-low temperature heating in enthalpy injection systems face issues with liquid entrainment in the refrigerant entering the compressor, leading to compressor damage and poor reliability.
Innovation Solution
A gas supplement control method that adjusts the state of a one-way electromagnetic valve based on outdoor ambient temperature and compressor operating state, including current operating frequency and exhaust temperature, to optimize gas supplement control and prevent liquid entrainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the one-way electromagnetic valve opens when ambient temperature is lower than a certain temperature to achieve gas supplement, then ultra-low temperature heating capability is improved, but liquid entrainment occurs causing compressor damage and poor reliability
Solution Approach 1:
The patent changes the control parameters from simple ambient temperature threshold to a comprehensive set including ambient temperature, compressor operating frequency, and exhaust temperature. This multi-parameter approach allows precise control of the one-way electromagnetic valve to ensure gas supplement only when refrigerant is fully vaporized, preventing liquid entrainment while maintaining ultra-low temperature heating capability
Solution Approach 2:
The patent implements feedback control by continuously monitoring compressor operating frequency and exhaust temperature, and using this information to dynamically adjust the one-way electromagnetic valve state. The controller receives real-time data and adjusts valve opening accordingly, creating a closed-loop control system that prevents liquid entrainment while maintaining heating performance
2Ease of operation
If the one-way electromagnetic valve is controlled only by ambient temperature threshold, then control simplicity is maintained, but liquid entrainment risk increases causing compressor damage
Solution Approach 1:
The patent transitions from single-parameter (ambient temperature) control to multi-parameter control including ambient temperature, compressor operating frequency, and exhaust temperature. This enhances control precision without significantly increasing operational complexity, as the controller automatically processes multiple inputs to determine valve state
Solution Approach 2:
The patent replaces simple mechanical temperature-based switching with an intelligent controller that processes multiple sensor inputs (temperature, frequency) and applies control logic to determine valve state. This substitution of mechanical control with electronic/intelligent control enables more reliable decision-making while maintaining ease of operation through automated control
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 method effectively reduces the risk of liquid entrainment, enhancing the reliability of the compressor operation and optimizing gas supplement control in the enthalpy injection system.
Implementation Method 1
an enthalpy injection system and a gas bypass, wherein the enthalpy injection system includes a one-way electromagnetic valve
Implementation Method 2
a compressor, an outdoor heat exchanger, an indoor heat exchanger, an enthalpy increasing system and a gas bypass
Implementation Method 3
an outdoor heat exchanger, an indoor heat exchanger
Implementation Method 4
a first refrigerant flow path is arranged between the outdoor heat exchanger and the indoor heat exchanger
Implementation Method 5
The refrigerant entering a gas supplement port of a compressor from the enthalpy injection gas supplement branch may have liquid entrainment problems
Data Source
AI summary
An air supplement control method for an air conditioner, and an air conditioner, a controller and a computer-readable storage medium are provided. The air conditioner includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, an enthalpy-increasing system and a gas bypass. The enthalpy-increasing system is provided with a one-way electromagnetic valve. The one-way electromagnetic valve is arranged on the second refrigerant flow path; and the gas bypass is arranged on the first refrigerant flow path and is positioned between the enthalpy-increasing system and the indoor heat exchanger. The air supplement control method includes acquiring an outdoor ambient temperature and an operating state of the compressor, and controlling the on-off state of the one-way electromagnetic valve according to the outdoor ambient temperature and the operating state.