US 11,913,704 B2
Three-pipe multi-split system and control method thereof
Xiangshi Mai, Foshan (CN); Hongbin Liu, Foshan (CN); and Defu Gao, Foshan (CN)
Assigned to GUANGDONG GIWEE TECHNOLOGY CO. LTD., Foshan (CN)
Filed by Guangdong Giwee Technology Co. Ltd., Foshan (CN)
Filed on Apr. 18, 2022, as Appl. No. 17/722,666.
Prior Publication US 2022/0333836 A1, Oct. 20, 2022
Int. Cl. F25D 21/00 (2006.01); F25D 21/12 (2006.01); F25B 41/26 (2021.01); F25B 13/00 (2006.01)
CPC F25D 21/002 (2013.01) [F25B 13/00 (2013.01); F25B 41/26 (2021.01); F25D 21/12 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A three-pipe multi-split system, the three-pipe multi-split system comprising an outdoor unit, a plurality of indoor units, and a plurality of hydraulic modules connected respectively by air pipes, liquid pipes, and condensate water pipes, wherein:
the outdoor unit comprises a compressor, a high-pressure pressure sensor, an oil separator, a first switching device, a second switching device, a third switching device, a finned heat exchanger, a compressor heat dissipation module, a plate type heat exchanger,
a first electronic expansion valve, a second electronic expansion valve, a filling needle valve, an air-liquid separator, a low-voltage switch, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve,
an outdoor unit fan, and an outdoor unit temperature detection subassembly;
each indoor unit comprises an indoor unit heat exchanger, a third electronic expansion valve, an indoor unit fan, and an indoor unit temperature detection subassembly; and
each hydraulic module comprises a coolant-water heat exchanger, a water pump, a water temperature detection sensor, a water flow switch,
a sixth electromagnetic valve, a seventh electromagnetic valve, and a fourth electronic expansion valve.
 
8. A control method of the three-pipe multi-split system according to claim 1, comprising the following steps: detecting an operation mode of the indoor units;
when the indoor units are in a cooling mode, controlling the system to operate according to a first mode; and when the indoor units are in a heating mode, controlling the system to operate according to a second mode.