Mode converter, heat recovery type multi-connected air conditioning system and control method

Abstract

The invention relates to a mode converter, a heat recovery type multi-connected air conditioning system and a control method. The mode converter comprises at least one mode conversion branch, wherein each mode conversion branch comprises a liquid pipe section, a high-pressure gas pipe section and a low-pressure gas pipe section, the two ends of each liquid pipe section are used for being connected with a main liquid pipe (P1) and a branch liquid pipe (P4) respectively, one end of each high-pressure gas pipe section is used for being connected with a main high-pressure gas pipe (P3), one end of each low-pressure gas pipe section is used for being connected with a main low-pressure air pipe (P2), and the other end of each high-pressure gas pipe section and the other end of each low-pressure gas pipe section are connected with a branch gas pipe (P5). The mode converter further comprises high-pressure electronic expansion valves (3) and low-pressure electronic expansion valves (2), the high-pressure electronic expansion valves (3) are connected in the high-pressure gas pipe sections in series, the low-pressure electronic expansion valves (2) are connected in the low-pressure gas pipe sections in series, and the high-pressure electronic expansion valves (3) and the low-pressure electronic expansion valves (2) are gradually opened and closed when the air-conditioning mode is switched so as to reduce the front-and-back pressure difference of mode switching operation. According to the mode converter, the heat recovery type multi-connected air conditioning system and the control method, the noise generated by the mode converter for switching the air-conditioning modes can be effectively lowered.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a mode converter, a heat recovery multi-connected air conditioning system and a control method. Background technique [0002] The heat recovery multi-connected air-conditioning system is an air-conditioning device that can meet the cooling and heating needs of multiple rooms at the same time, and can convert the heat exchange energy of part of the space to other spaces in the system for use, so as to achieve the purpose of energy recovery , Realize the reasonable transfer and utilization of energy in the air conditioning system. [0003] In the heat recovery multi-connected air conditioning system, the mode converter is a very important functional component. It can not only replace the branch pipe, but also be responsible for the mode switching function of the unit operation. Existing mode converters mainly use solenoid valves to switch between liquid pipes and high and low press...

AI Technical Summary

Problems solved by technology

In the existing mode converter, the solenoid valve is mainly used to switch the liquid pipe and the high and low pressure gas pipe. Due to the large pressure difference between the front and rear of the valve body of the solenoid valve, when the mode is switched, the noise at the moment of the valve body switching is very obvious.

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