Multi-Split Compressor Oil Volume Control for Pressure Loss Balance
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Solution Overview
Problem
In multi-split air conditioning systems, insufficient lubricating oil in the compressor can lead to increased power consumption, component wear, and reduced efficiency, while excessive oil can decrease heat exchange performance and increase pressure loss, especially during installation with longer piping or larger indoor units.
Innovation Solution
A method and apparatus for adjusting the oil volume in the compressor, using a switch unit and an oil volume adjusting unit to detect and control the oil level, turning on the adjusting unit when insufficient and recovering oil to a storage tank when the level is adequate, connected in parallel with an oil separator and heat exchanger, with electromagnetic valves and capillary tubes for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional lubricating oil is added during installation to ensure sufficient lubrication in long-piping systems, then the compressor lubrication is improved, but redundant oil enters the heat exchanger and refrigerant connection pipe, decreasing heat exchange performance and increasing pressure loss
Solution Approach 1:
The patent applies the dynamics principle by making the oil supply system adjustable rather than fixed. The oil supply amount is dynamically controlled based on installation conditions (piping length, indoor unit ratio) through a configurable oil supply parameter setting unit, allowing the system to adapt oil distribution to actual needs and avoid both insufficient and excessive oil conditions.
Solution Approach 2:
The patent implements parameter changes by allowing the oil supply parameter to be modified according to different installation scenarios. The oil supply control unit adjusts the oil supply amount based on changed parameters such as piping length and indoor unit configuration, thereby optimizing the balance between compressor lubrication and heat exchanger performance.
2Reliability
If additional lubricating oil is added during installation to ensure sufficient lubrication in long-piping systems, then the compressor lubrication is improved, but the pressure loss of the refrigerant connection pipe increases
Solution Approach 1:
The patent applies the dynamics principle by making the oil supply system adjustable rather than fixed. The oil supply amount is dynamically controlled based on installation conditions (piping length, indoor unit ratio) through a configurable oil supply parameter setting unit, allowing the system to adapt oil distribution to actual needs and avoid both insufficient and excessive oil conditions.
Solution Approach 2:
The patent implements parameter changes by allowing the oil supply parameter to be modified according to different installation scenarios. The oil supply control unit adjusts the oil supply amount based on changed parameters such as piping length and indoor unit configuration, thereby optimizing the balance between compressor lubrication and heat exchanger performance.
3Reliability
If the maximum amount of lubricating oil is added according to installation range design, then the compressor lubrication is ensured under worst-case conditions, but the system complexity increases due to the need for oil recovery mechanisms
Solution Approach 1:
The patent applies the preliminary action principle by pre-configuring the oil supply parameter during system installation or initial setup. The oil supply control unit is programmed with appropriate oil supply amounts based on the specific installation configuration before operation begins, eliminating the need for complex real-time oil recovery mechanisms while ensuring adequate lubrication.
Solution Approach 2:
The patent implements self-service by enabling the system to automatically adjust oil supply based on pre-set parameters related to piping length and indoor unit configuration. The control unit autonomously determines the appropriate oil supply amount without requiring manual intervention or complex recovery systems, simplifying the overall device structure.
Data Source
AI summary
A method and device for adjusting an oil volume of a compressor of a multi-split system. The method comprises the following steps: (S1) during an operation of a multi-split system, detecting at a first pre-set time interval whether an oil volume of a compressor is insufficient; (S2) if the oil volume of the compressor is insufficient, controlling an oil volume adjusting unit to turn on for a second pre-set time and then turn off; (S3) acquiring a total turn-on time of the oil volume adjusting unit, and determining whether the total turn-on time exceeds a pre-set value; (S4) if the total turn-on time exceeds the pre-set value and it has not been detected over a continuous third pre-set time that the oil volume of the compressor is insufficient, recycling oil back to an oil storage tank by controlling a switch unit and the oil volume adjusting unit.