Three-control multi-connection system and its control method

Abstract

The invention discloses a three-pipe multi-line system and a control method. The three-pipe multi-line system includes: a compressor assembly, a plurality of first heat exchanger assemblies arranged in parallel, and a plurality of second heat exchangers arranged in parallel A component, a refrigerant distribution device, a flow regulating device and a second switching device, the flow regulating device is connected between the second end of one of the multiple first heat exchangers and the corresponding first throttling device; the second switching device It includes the first switching port to the third switching port, the first switching port is connected to the suction port of the compressor assembly, the third switching port is connected between the flow regulating device and the corresponding first throttling device, the second switching port is connected to the Any one of the first switching port and the third switching port is switched and conducted, and the second end of each second heat exchanger is switchably connected to the second switching port and the compressor assembly through the distribution switching part of the corresponding refrigerant distribution device. Exhaust port conduction. According to the three-control multi-connection system of the present invention, the reliability is high.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a three-pipe multi-line system and a control method thereof. Background technique [0002] In the traditional heat pump multi-connected system, when the cooling demand is generated indoors, the heat pump multi-connected system transfers the heat load from the indoor side to the outdoor unit of the heat pump multi-connected system through the refrigerant, and releases the heat through the condensation of the heat exchanger inside the outdoor unit When there is a heating demand on the indoor side, the heat pump multi-connected system switches the heat exchanger inside the outdoor unit to an evaporator to absorb heat from the surrounding environment, and then transfers the heat absorbed by the outdoor unit to the indoor side through the refrigerant, so as to Meet the heating demand on the indoor side. However, in building air-conditioning systems using multi-connected air-con...

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Problems solved by technology

[0003] Although the three-pipe multi-connected system can cool and heat at the same time, when some of the heat exchangers of the outdoor unit are used as evaporators, if the outdoor ambient temperature is lower than a certain temperature (for example, below 5 degrees Celsius), due to the heat exchange of the outdoor unit If the evaporator temperature is too low, the evaporating temperature of the indoor unit will be lowered, causing the coil and fins in the refrigerated internal unit to frost, which will cause the internal unit to frequently enter the anti-freezing protection, affecting the comfort of the refrigerated internal unit. Possibility of condensed water and freezing of internal unit piping

[0004] In the related technology, the method of closing the throttle valve of the refrigeration internal unit is mainly adopted to deal with it very small. However, this will cause the outlet air temperature of the refrigeration internal unit to be low, and the coil and fin structure in the internal unit cannot be avoided. Frost

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