Multi-split air conditioning system and starting control method thereof

Abstract

The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioning system and a starting control method thereof. The multi-split air conditioning systemand the starting control method thereof aim to solve the problems that in the prior art, when an air conditioning system is started, the air conditioning effect is affected and even the system has ultralow pressure and other faults if the opening degrees of expansion valves of an indoor unit and an outdoor unit are too small, but compressor liquid impact cannot be effectively avoided if the opening degrees are too large. The starting control method of the multi-split air conditioning system includes the following steps of obtaining operation parameters of a compressor in a timed mode in the starting process of the multi-split air conditioning system, obtaining an operation mode of the multi-split air conditioning system, calculating target opening degree values of expansion valves according to the operation mode and the operation parameters, and adjusting the opening degrees of the expansion valves on the outdoor unit side or the indoor unit side according to the operation mode and thetarget opening degree values of the expansion valves. Compared with a method that expansion valves are kept in a fixed opening degree in the starting process in the prior art, the operation effect ofthe multi-split air conditioning system is guaranteed to the maximum extent under the condition of effectively preventing liquid impact, and stable and reliable operation of the system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a multi-connected air conditioning system and a start-up control method thereof. Background technique [0002] In a multi-split air conditioning system, the outdoor unit is connected to multiple indoor units. In order to ensure the normal operation of the system, it is necessary to add refrigerant on site according to the pipeline length and pipe diameter of the internal and external units. However, at the same time, too much refrigerant will cause liquid hammer damage to the compressor at the initial stage of system operation. [0003] The invention patent document with the publication number CN107642873A (application date: 2017.10.31, publication date: 2018.01.30) discloses a method for controlling the opening of the electronic expansion valve when the air conditioner is started. Determine whether the startup is in a cold start state, a hot start state or an intermedi...

AI Technical Summary

Problems solved by technology

However, if the opening of the expansion valve of the internal and external units is too small during startup, it will affect the air-conditioning effect and even lead to failures such as low pressure in the system, and if the opening is too large, it will not be able to effectively avoid compressor liquid shock

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