Multi-split air conditioning system

Abstract

The invention discloses a multi-split air conditioning system. According to the multi-split air conditioning system, refrigerant noise can be reduced without additionally arranging related parts, so that the space structure of an indoor unit is simplified, and the production cost of the whole unit is reduced. The multi-split air conditioning system comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises an outdoor heat exchanger, a compressor, an outdoor throttling element and an outdoor fan, the indoor unit set comprises a plurality of indoor units connected in parallel, and each indoor unit comprises an indoor heat exchanger and an indoor throttling element; and the multi-split air conditioning system further comprises a controller, the controller is configured to control the dryness x of a refrigerant at an inlet of the indoor heat exchanger to be not equal to a, and a is an equal dryness value corresponding to an equal dryness line in a pressure enthalpy diagram of the refrigerant. According to the multi-split air conditioning system, the controller controls the dryness x of the refrigerant at the inlet of the indoor heat exchanger of the multi-split air conditioning system (namely before the refrigerant flows through the indoor heat exchanger) to be not equal to a so as to eliminate the flowing noise of the refrigerant, other parts do not need to be additionally arranged, the indoor unit structure is simplified, the production cost of the whole unit is reduced, and the product cost competitiveness is improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a multi-connected air conditioning system capable of reducing refrigerant noise. Background technique [0002] Multi-connected air-conditioning system is a kind of central air-conditioning system, which can also be called "one-to-many", where one refers to one outdoor unit, and multi-unit refers to multiple indoor units, and the outdoor units adopt air-cooled heat exchange Indoor cooling is achieved by evaporative heat exchange, which is widely used in some small and medium-sized buildings. [0003] When the indoor unit is in cooling operation, there is usually refrigerant noise. The noise caused by the refrigerant usually depends on the phase state and flow pattern of the refrigerant. When the multi-connected unit is in the cooling state, the high-temperature and high-pressure gaseous refrigerant is transformed into a high-pressure subcooled liquid refrige...

AI Technical Summary

Problems solved by technology

Adding capillary tubes upstream or downstream of the electronic expansion valve can solve the refrigerant flow noise, but adding capillary tubes for heating will increase the resistance along the pipeline of the indoor unit and reduce the heating capacity; at the same time, adding pipeline parts to the indoor unit will cause Increase the effective space loss of the indoor unit, there is a risk of reducing the effective heat exchange area of ​​the indoor unit, and increasing the pipeline parts will also increase the product cost and weaken the product cost competitiveness

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