Three-pipe multifunctional variable refrigerant flow system

Abstract

The invention provides a three-pipe multifunctional variable refrigerant flow system which comprises an outdoor unit, at least two sets of indoor units arranged in parallel and a hydraulic module, and the outdoor unit comprises a compressor, an oil separator, a first four-way valve, a second four-way valve, a third four-way valve, a fin heat exchanger, a compressor heat dissipation module, a plate heat exchanger and a gas-liquid separator. Each of the first four-way valve, the second four-way valve and the third four-way valve is provided with an end D, an end C, an end E and an end S. The output end of the compressor is connected with one end of the oil separator. The other end of the oil separator is connected with the end D of the first four-way valve, the end D of the second four-way valve and the end D of the third four-way valve. The end C of the second four-way valve is connected with the fin heat exchanger.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a three-control multifunctional multi-connection system. [0002] technical background [0003] At present, in the hot water preparation process of the existing multi-functional multi-line distribution hydraulic module, when the air conditioner indoor unit is cooling, the hydraulic module acts as a condenser in the air conditioning system. When the temperature of the hot water is high, the condensation temperature is high and the condensation pressure is high. , The condensation effect of the refrigerant in the hydraulic module is poor. When the condensation effect of the refrigerant is poor, it is easy to produce a gas-liquid two-phase refrigerant. The high-temperature and high-pressure gas-liquid two-phase refrigerant not only affects the cooling effect, but also causes a bias flow of the refrigerant between the indoor units. At the same time, it also occu...

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Problems solved by technology

The high-temperature and high-pressure gas-liquid two-phase refrigerant not only affects the cooling effect, but also causes a bias flow of the refrigerant between the indoor units.

At the same time, it also occupies the effective volume of the refrigerant in the system pipeline, which is likely to cause liquid shock and affect the reliability of the system.

[0004] Existing multi-functional multi-connection unit is in the hot water heating mode of the hydraulic module and the indoor unit of the air conditioner is in the heating mode. The electronic expansion valve opening adjustment of the indoor unit of the air conditioner is difficult to ensure that there is enough refrigerant flowing to the hydraulic module to heat the hot water and ensure the outlet water temperature

[0005] In the existing multi-functional multi-connected hot water system, in the process of making hot water at low ambient temperature, when the outlet water temperature is high, it is difficult for the high-temperature refrigerant to condense in the hydraulic module, and this part of the high-temperature refrigerant flows to the outdoor unit. Release heat to the environment, resulting in waste of heat; at the same time, in the low-temperature heating process, due to the low ambient temperature and low evaporation pressure, it is easy to cause the accumulation of refrigerant and oil in the heat exchanger of the outdoor unit, affecting the system refrigerant and oil cycle, it is easy to cause problems such as less lubricating oil in the compressor and high exhaust temperature

[0006] The existing multi-functional multi-connected system is in the process of performing small-load cooling of air-conditioning indoor units and adding hot water by hydraulic modules at high temperatures. Due to the high temperature of the outlet water, when the outdoor unit is used as an evaporator, it is more attractive to low-temperature refrigerants. At the same time, due to the poor condensation effect of the refrigerant, the cooling effect is not good under a small load.

[0007] In the existing multi-functional multi-connected system, in the mode of air conditioning indoor unit cooling plus hydraulic module cooling, when the outlet water temperature is required to be low, at this time, due to the different evaporation temperatures of the two, the attraction to the refrigerant is different, making it difficult for the hydraulic module to reach a lower temperature. water temperature

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