Vapor-injected multi-connected air conditioning system

Abstract

The invention discloses a vapor-injected multi-connected air conditioning system. The system comprises an indoor unit, an outdoor unit, a distribution pipe, and a throttle device, wherein the outdoor unit is provided with a first electronic expansion valve capable of changing the operating state of coolant, the indoor unit is connected with the outdoor unit through the distribution pipe and the throttle device disposed on the distribution pipe of the indoor unit is used for changing the operating state of the coolant. Under the refrigerating condition, the first electronic expansion valve is fully open, while the operating state of the coolant is unchanged. The operational reliability of the vapor-injected multi-connected air conditioning system can be improved.

Description

technical field [0001] The invention relates to an air-conditioning refrigeration control technology, in particular to a multi-connected air-conditioning system for supplementing air and increasing enthalpy. Background technique [0002] In the outdoor unit of the multi-connected air conditioning system, in the cooling operation state, the electronic expansion valve is used as a throttling device for the refrigerant fluid circulation of the outdoor unit. By adjusting its opening, the refrigerant circulation of the outdoor unit can be controlled, thereby controlling the indoor unit. Realize the purpose of temperature and humidity regulation, and create a comfortable working and living environment for users. [0003] In the outdoor unit of the multi-connected air-conditioning system, since the heat exchange flow of the heat exchanger of the indoor unit and the supply air flow of the compressor in the outdoor unit need to be distributed according to the total flow of the outdoo...

AI Technical Summary

Problems solved by technology

[0016] It can be seen from the above that the existing multi-connected air-conditioning system with air supplementation and enthalpy increase can usually only realize the control of air supplementation and enthalpy increase under heating conditions. Afterwards, the high-temperature and high-pressure liquid refrigerant turns into a low-temperature and low-pressure two-phase refrigerant, and the pressure is lower. Therefore, the pressure difference with the air supply port of the compressor is small, and it cannot flow into the air supply port of the compressor through the second electronic expansion valve.

Therefore, the existing multi-connected air-conditioning system with air supply and enthalpy increase cannot realize the control of air supply and enthalpy increase under refrigeration conditions, so that the performance of the compressor will decrease due to insufficient air supply, which will affect the normal operation of the system and reduce the system capacity. operational reliability

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