Method and device for controlling pressure of units with height drop, and air conditioner device
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Solution Overview
Problem
Height drop between indoor and outdoor units in multi-connected air conditioner systems affects refrigerant circulation, leading to performance issues and installation challenges due to gravity-induced refrigerant accumulation in low positions.
Innovation Solution
A method and device that monitor operating modes and adjust the opening degree of electronic expansion valves based on obtained operating parameters to control intermediate pressure, ensuring sufficient refrigerant circulation by adjusting the EEVs in cooling and heating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If indoor and outdoor units are installed on different floors to increase installation flexibility, then installation adaptability is improved, but refrigerant circulation is affected by gravity causing performance degradation
Solution Approach 1:
The patent changes the operating parameters of the electronic expansion valve (opening degree) based on the height difference between indoor and outdoor units. By adjusting the opening degree parameter, the system compensates for gravity-induced pressure changes and maintains optimal refrigerant circulation despite vertical installation configurations.
Solution Approach 2:
The system uses feedback from sensors that detect operating conditions including height difference to dynamically adjust the electronic expansion valve opening degree. This closed-loop control ensures refrigerant circulation remains optimal regardless of the installation's vertical configuration.
2Reliability
If electronic expansion valve opening degree is adjusted to compensate for height drop, then refrigerant circulation is improved, but system complexity increases
Solution Approach 1:
The control system automatically adjusts the electronic expansion valve opening degree based on pre-stored correspondence relationships between height differences and opening degrees. The system serves itself by using built-in lookup tables and automatic control logic, eliminating the need for manual calibration or complex external control mechanisms.
3Measurement precision
If sensors are installed to monitor operating modes and parameters, then control precision is improved, but device complexity increases
Solution Approach 1:
The electronic expansion valve control system serves multiple functions: it regulates refrigerant flow based on height difference compensation, responds to various operating modes (cooling, heating, defrosting), and integrates with existing temperature and pressure sensors. This multi-functionality reduces the need for separate dedicated components for each control function.
Data Source
AI summary
Disclosed are a method and device for controlling pressure of units with height drop, and an air conditioner device. The method includes: monitoring an operating mode of the unit; obtaining an operating parameter corresponding to the operating mode according to the operating mode; and adjusting an opening degree of an electronic expansion valve according to the operating parameter.