A three-control multi-connection system and its control method

Abstract

The invention relates to the technical field of air conditioners, in particular to a three-pipe multi-connection system and a control method thereof, including an outdoor unit, a multi-connection indoor unit and a hydraulic module. Or overcooled by the plate heat exchanger, the temperature of the refrigerant entering the refrigerant cooling module is lower, causing condensation in the refrigerant cooling module, which in turn causes condensation water to cause damage to the compressor inverter module, and makes more refrigerant flow through the refrigerant to dissipate heat. module, reduce the module temperature, and at the same time, cooperate with the system to increase the control logic to avoid the module temperature from being too high, effectively reduce the compressor module temperature, ensure the unidirectionality of the refrigerant flowing through the first electronic expansion valve, and improve the cut-off of the first electronic expansion valve. capability and reliability.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a three-pipe multi-connection system and a control method thereof. Background technique [0002] In the existing multi-line hot water system, the air-cooled heat exchangers of the outdoor unit are either all used as evaporators or all of them are used as condensers, and the refrigerant heat dissipation of the current multi-line hot water system is electronically expanded during cooling. The refrigerant has a certain throttling effect. The temperature of the refrigerant throttled by the electronic expansion valve is relatively low. When the low-temperature refrigerant flows through the refrigerant cooling module, condensation water is easily generated on its surface. The electronic control components are short-circuited, which will cause safety accidents such as electric leakage of the electronic control components. In the heating mode of the multi-line hot water system, ...

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Problems solved by technology

[0002] In the existing multi-connected hot water system, the air-cooled heat exchangers of the outdoor units are all used as evaporators or used as condensers, and the cooling medium of the current multi-connected hot water system is in electronic expansion during cooling. The refrigerant has a certain throttling effect. The temperature of the refrigerant throttled by the electronic expansion valve is relatively low. When the low-temperature refrigerant flows through the refrigerant heat dissipation module, condensation water is likely to be generated on its surface. The low-temperature condensation water contacts the electronic control components, which is easy to cause Electronic control components are short-circuited, which in turn causes safety accidents such as electrical leakage of electronic control components. In the heating mode of the multi-connected hot water system, the refrigerant is overcooled by the plate heat exchanger, and the temperature is low, so that the refrigerant flowing through the cooling module The temperature of the refrigerant is low, and there is a greater risk of condensation. After the heat exchanger of the external unit is turned off in the multi-connected hot water system, no refrigerant flows through the refrigerant heat dissipation module, and the inverter module of the compressor cannot fully dissipate heat. When the module temperature is high, it is impossible to ensure that there is enough refrigerant flowing through the refrigerant heat dissipation module, resulting in high temperature of the frequency conversion module of the compressor, which cannot effectively protect the frequency conversion module

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