Air Conditioner Compressor Preheating for High-Drop Oil Return Control
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Solution Overview
Problem
In air conditioning systems with high-drop or long-pipe installations, the lubricating oil in the compressor is difficult to return, leading to increased losses in internal winding coils and motors, especially under low-temperature conditions, and existing technologies struggle to maintain normal operation and heating functionality.
Innovation Solution
A control method and device that preheats the compressor by setting specific turning-off conditions for the crankshaft heating belt based on ambient and compressor exhaust temperatures, operating durations, and modes of operation, ensuring the lubricating oil remains in the compressor cavity and preventing refrigerant evaporation, thereby facilitating oil return and maintaining compressor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the compressor is started directly under low-temperature conditions in high-drop mode, then the starting process is simple and quick, but the lubricating oil is carried away by evaporating refrigerant, causing insufficient lubrication and increased losses
Solution Approach 1:
The crankshaft heating belt is activated before compressor startup to preheat the lubricating oil and prevent refrigerant from carrying oil away during the starting process. This preliminary heating action ensures proper lubrication is maintained from the moment the compressor starts, resolving the contradiction between quick startup and reliable lubrication.
2Reliability
If the crankshaft heating belt is kept on continuously to ensure proper lubrication, then oil return is improved, but energy consumption increases
Solution Approach 1:
The crankshaft heating belt operates periodically rather than continuously - it is activated only under specific conditions (high-drop mode with low outdoor temperature) and turned off when conditions improve. This periodic operation maintains reliable lubrication when needed while minimizing energy consumption during normal operation.
3Adaptability or versatility
If the air conditioner is installed with high drop or long pipe length, then installation flexibility is improved, but oil return becomes difficult and compressor lubrication is compromised
Solution Approach 1:
The system detects installation parameters (high-drop mode identification) and operational parameters (outdoor temperature, compressor exhaust temperature) to dynamically adjust the heating belt operation. By changing operational parameters based on installation conditions, the system maintains reliable oil return even with high drop or long pipe installations.
4Reliability
If the compressor is preheated for a long duration to ensure complete oil return, then lubrication reliability is improved, but the time to reach operating temperature increases
Solution Approach 1:
The system continuously monitors compressor exhaust temperature and outdoor temperature to determine when sufficient preheating has been achieved. This feedback mechanism allows the heating belt to be turned off at the optimal moment - long enough to ensure proper lubrication but not so long as to waste time, resolving the contradiction between reliability and time loss.
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 prevents oil loss and ensures stable compressor operation by preheating the compressor, improving user experience and extending the service life of the compressor, while also optimizing energy consumption by turning off the crankshaft heating belt when necessary.
Implementation Method 1
a crankshaft heating belt is provided at the bottom of the compressor... turning on the crankshaft heating belt... preheating the compressor
Data Source
AI summary
Embodiments of the present disclosure provide a control method suitable for an air conditioner in a high-drop mode, wherein the air conditioner comprises at least a compressor, and a crankshaft heating belt is provided at the bottom of the compressor. The control method comprises: detecting an outdoor ambient temperature and a compressor exhaust temperature in real time; determining whether the air conditioner meets a preheating condition; if the air conditioner meets the preheating condition, turning on the crankshaft heating belt; and determining whether the air conditioner is in a high-drop mode; if the air conditioner is in the high-drop mode, determining whether the air conditioner is in a cooling mode; if the air conditioner is in the cooling mode, turning on the compressor, and determining whether to turn off the crankshaft heating belt based on an operating duration of the compressor and the compressor exhaust temperature.