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A method for controlling oil return in a multi-connected air conditioning system

A multi-connected air conditioner and control method technology, applied in heating and ventilation control systems, heating and ventilation safety systems, refrigerators, etc., can solve the problem of compressor power consumption, increased wear of heat-generating components, reduced compressor service life, Burn out the compressor and other problems to achieve the effect of improving indoor comfort, realizing precise control, and avoiding oil-starved operation

Active Publication Date: 2022-07-08
GUANDONG GIWEE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing air conditioning system will fix the oil return operation time in the oil return operation mode. Such a control method may cause the compressor to run without oil, which will lead to increased power consumption, heat generation and component wear of the compressor. It will reduce the service life of the compressor, or even burn the compressor
In addition, the existing air-conditioning system is running in the cooling mode when operating in the oil return operation mode, and the indoor unit is cooling. Lower air temperature, affecting indoor comfort

Method used

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  • A method for controlling oil return in a multi-connected air conditioning system
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  • A method for controlling oil return in a multi-connected air conditioning system

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Embodiment Construction

[0025] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that a thorough and complete understanding of the present disclosure will be provided.

[0026] refer to figure 1 , In this embodiment, a method for controlling oil return of a multi-line air conditioning system, the control method includes the following steps:

[0027] In step S1, the air-conditioning system continuously detects the condensation temperature T3, the exhaust temperature T5, the compressor frequency, the oil return amount of the compressor and the compressor speed. Calculate the oil discharge volume L1 of the primary system based on the compressor fre...

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Abstract

A method for controlling oil return of a multi-connected air conditioning system, the control method includes the following steps: step S1, calculating the oil discharge amount L1 of the system; step S2, calculating the cumulative oil discharge amount L of the system according to the operating state of the air conditioning system, and then according to The relationship between the cumulative oil output L of the system and the oil return of the compressor; step S3, the air-conditioning system operates in the oil-return operation mode, adjusts the air-conditioning system to the refrigeration mode, and adjusts the operating frequency of the compressor to run at the lowest frequency of the oil-return frequency. The outdoor electronic expansion valve reaches the first preset opening degree, the fan of the indoor heat exchanger is stopped, and according to the operation mode of the air conditioning system in step S1, the opening degree B1 of the indoor electronic expansion valve of the non-operating indoor unit is increased and the operating mode is The opening degree B2 of the indoor electronic expansion valve of the indoor unit in the air supply mode, step S4, adjust the operation time of the oil return operation mode according to the magnitude relationship between the compressor operating frequency and the minimum allowable oil return frequency.

Description

technical field [0001] The invention relates to the technical field of air-conditioning oil return control, in particular to a method for controlling oil return of a multi-connected air-conditioning system. Background technique [0002] Generally, the air conditioning system will enter the oil return operation mode after running for a period of time, and the lubricating oil will be returned to the compressor. At present, the existing air conditioning system will fix the operating time of oil return in the oil return operation mode. Such a control method may cause the compressor to run short of oil, which will lead to increased compressor power consumption, heat generation and component wear. It will reduce the service life of the compressor, or even burn the compressor. In addition, the existing air-conditioning system operates in the cooling mode when the oil-return operation mode is operated, and the indoor unit is cooled. If the air-conditioning system operates the heati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/30F24F11/64F24F11/65F24F11/84F24F11/86F24F11/88F25B31/00
CPCF24F11/30F24F11/64F24F11/65F24F11/84F24F11/86F24F11/88F25B31/004F25B2500/16Y02B30/70
Inventor 王有欣熊琼
Owner GUANDONG GIWEE TECH CO LTD
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