Multi-Split Air Conditioner Oil Return During Continuous Heating
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Solution Overview
Problem
In multi-split air conditioners during heating, oil accumulation in gas pipes leads to insufficient lubrication in the compressor, causing abnormal operation and potential damage, and existing oil return methods disrupt heating efficiency and comfort by requiring a switch to refrigeration mode and prolonging low-pressure states.
Innovation Solution
An oil return method that adjusts compressor frequency and indoor throttling element open degrees without switching the four-way valve, measures operation parameters to ensure normal operation, and ends the oil return process based on preset times and conditions to maintain heating efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the four-way valve is switched to refrigeration mode for oil return, then oil can be returned from gas pipes, but heating operation stops and comfort is affected
Solution Approach 1:
The patent changes operational parameters (compressor frequency and throttling element opening degree) rather than switching the four-way valve mode. By adjusting compressor frequency to a preset value and opening degree of indoor throttling elements, oil return is achieved while maintaining heating mode, thus resolving the contradiction between oil return effectiveness and heating continuity
Solution Approach 2:
The patent dynamically adjusts the operation frequency of the compressor and the opening degree of throttling elements during heating operation to enable oil return. This dynamic parameter adjustment allows the system to perform oil return functions without stopping heating, maintaining system adaptability and heating continuity
2Ease of operation
If compressor frequency is increased and throttling elements are adjusted for oil return, then heating can continue during oil return, but running of the air conditioner is more greatly affected
Solution Approach 1:
The patent implements a control method that monitors operation parameters and compares them with preset values. When oil return is needed, the system adjusts compressor frequency and throttling element opening degree based on feedback from parameter detection, ensuring stable operation during oil return while maintaining heating continuity
Solution Approach 2:
The system automatically adjusts its own operational parameters (compressor frequency and throttling element opening) to perform oil return during heating operation. This self-adjusting mechanism enables the air conditioner to handle oil return internally without external intervention or mode switching, maintaining both heating continuity and system stability
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
This method ensures reliable oil return and persistent heating performance, improving user comfort by minimizing disruptions to heating operation and maintaining air conditioner reliability during the oil return process.
Implementation Method 1
the outdoor unit comprises a compressor
Implementation Method 2
switching the four-way valve to the refrigeration mode
Implementation Method 3
an outdoor heat exchanger
Implementation Method 4
Each of the indoor units comprises an indoor heat exchanger
Implementation Method 5
an outdoor throttling element and an indoor throttling element
Data Source
AI summary
An oil return method for multi-split air conditioner in heating comprises steps of: S1, adjusting operation frequency f0 of a compressor (11) to a first preset oil return frequency f1, and simultaneously, adjusting open degree S0 of each indoor throttling element (22) to a preset oil return open degree; S2, measuring operation parameters of the air conditioner; S3, judging whether the air conditioner operates abnormally, jumping to Step S4 if so, or jumping to Step S5 if not; S4, exiting from oil return process, adjusting the operation frequency f0 of the compressor (11) to a second preset oil return frequency f2, judging whether the air conditioner operates abnormally, existing from the oil return process if so, or jumping to Step S5 if not; S5, ending the oil return process when oil return time reaches the oil return time t2.