Multi-connected air conditioning system

Abstract

The invention provides a multi-connected air-conditioning system, which can reduce refrigerant noise without adding related components, thereby simplifying the space structure of the indoor unit and reducing the production cost of the complete unit. The multi-connected air-conditioning system includes: an outdoor unit including an outdoor heat exchanger, a compressor, an outdoor throttling element and an outdoor fan; an indoor unit including a plurality of parallel indoor units, each of which includes an indoor heat exchanger The multi-connected air-conditioning system also includes: a controller configured to control the dryness x of the refrigerant at the inlet of the indoor heat exchanger to satisfy 0<x<a, where a is the pressure-enthalpy of the refrigerant The iso-dryness value corresponding to the iso-dryness line in the figure. In the present invention, the refrigerant dryness x at the inlet of the indoor heat exchanger of the multi-connected air-conditioning system (that is, before flowing through the indoor unit heat exchanger) is controlled by the controller to satisfy 0<x<a to eliminate the refrigerant flow noise without adding other components. components, simplify the structure of the indoor unit, reduce the production cost of the whole unit, and improve product competitiveness.

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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