Multi-split air conditioner and control method thereof

Abstract

The invention belongs to the technical field of a multi-split air conditioner, and discloses a multi-split air conditioner and a control method thereof. A compressor is respectively communicated with an inlet of an outdoor heat exchanger and an outlet of a gas-liquid separator; an indoor evaporation unit is arranged between an outlet of the outdoor heat exchanger and an inlet of the gas-liquid separator; the outlet of the outdoor heat exchanger and the inlet of the gas-liquid separator are communicated through a second throttling component; the indoor evaporation unit comprises a plurality of groups of indoor evaporators in parallel connection, and an inlet temperature sensing bag and an outlet temperature sensing bag are respectively arranged on a branch at which each indoor evaporator is located. The coolant temperature at the outlet and the inlet of the indoor evaporator is detected, and the overheat degree is obtained through calculation and is compared with a set value, so the opening degree of the second throttling component is regulated according to the result, and the goal of regulating the total quantity of the coolant entering the indoor evaporation unit is achieved, and the frequent starting and stopping of an outdoor unit is avoided, the use comfort degree of a user is improved, and the stability of an air conditioner system is ensured.

Description

technical field [0001] The invention relates to the technical field of multi-connected air conditioners, in particular to a multi-connected air conditioner operating with a small load and a control method thereof. Background technique [0002] With the development of multi-connection technology, in order to improve the comfort of users, the length of multi-connection piping is getting longer and longer, the number of indoor units is increasing, and the number of outdoor units is required to be larger and larger. The compressor that matches the outdoor unit The displacement is also getting bigger and bigger. For multi-connected systems, variable frequency compressors are generally used, but the variable frequency compressors have a minimum operating frequency. For the volume compressor, the capacity output is still too high, which will cause the low pressure to be too low, and the evaporation temperature to be lower than 0 degrees; When the temperature rises, stop the extern...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that when the displacement of the compressor of the multi-connected air conditioner is large and the air conditioner system operates with a small load, the outdoor unit needs to be started and stopped frequently, which affects the comfort of the user and the reliability of the system

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