US 12,228,317 B2
Refrigerator cooling system and method for defrosting refrigerator
Jindong Wang, Hefei (CN)
Assigned to HEFEI MIDEA REFRIGERATOR CO., LTD., Anhui (CN); HEFEI HUALING CO., LTD., Anhui (CN); and MIDEA GROUP CO., LTD., Guangdong (CN)
Appl. No. 18/004,034
Filed by HEFEI MIDEA REFRIGERATOR CO., LTD., Hefei (CN); HEFEI HUALING CO., LTD., Hefei (CN); and MIDEA GROUP CO., LTD., Guangdong (CN)
PCT Filed Nov. 16, 2021, PCT No. PCT/CN2021/130802
§ 371(c)(1), (2) Date Dec. 30, 2022,
PCT Pub. No. WO2022/100749, PCT Pub. Date May 19, 2022.
Claims priority of application No. 202011283321.9 (CN), filed on Nov. 16, 2020.
Prior Publication US 2023/0258375 A1, Aug. 17, 2023
Int. Cl. F25B 41/20 (2021.01); F25B 41/37 (2021.01); F25B 47/02 (2006.01); F25B 49/02 (2006.01)
CPC F25B 41/20 (2021.01) [F25B 41/37 (2021.01); F25B 47/02 (2013.01); F25B 49/02 (2013.01); F25B 2347/02 (2013.01); F25B 2400/01 (2013.01); F25B 2400/0411 (2013.01); F25B 2700/2117 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A refrigerator cooling system, comprising:
a refrigerant circulation flow path provided with a compressor, a condenser, a throttling device and an evaporator;
a backflow trunk section in communication with the evaporator and the compressor;
a gasification branch provided in parallel with the backflow trunk section;
a heating device provided on the gasification branch to gasify a liquid refrigerant; and
a switching structure,
wherein the throttling device has a throttling working mode and a defrosting working mode, and a working mode of the throttle device is configured to switch between the throttling working mode and the defrosting working mode;
wherein the condenser has a first heat release mode corresponding to the throttling working mode and a second heat release mode corresponding to the defrosting working mode, and a heat release amount of a refrigerant flowing through the condenser in the second heat release mode is smaller than a heat release amount of the refrigerant flowing through the condenser in the first heat release mode,
in response to the throttling device being in the throttling working mode, the switching structure switches the refrigerant from the backflow trunk section to flow back to the compressor; and
in response to the throttling device being in the defrosting working mode, the switching structure switches the refrigerant from the gasification branch to flow back to the compressor.
 
10. A method for defrosting a refrigerator, applied to a refrigerator cooling system of the refrigerator having a throttle device, an evaporator, a compressor, a condenser, a backflow trunk section in communication with the evaporator and the compressor and a gasification branch provided in parallel with the backflow trunk section, the method comprising:
obtaining an actual working time of the throttling device in a throttling working mode; and
in response to that the actual working time reaches a preset time, switching a working mode of the throttling device from the throttling working mode to a defrosting working mode;
in response to the throttling device being in the throttling working mode, switching the refrigerant from the backflow trunk section to flow back to the compressor; and
in response to the throttling device being in the defrosting working mode, switching the refrigerant from the gasification branch to flow back to the compressor,
wherein the condenser has a first heat release mode corresponding to the throttling working mode and a second heat release mode corresponding to the defrosting working mode, and a heat release amount of a refrigerant flowing through the condenser in the second heat release mode is smaller than a heat release amount of the refrigerant flowing through the condenser in the first heat release mode.
 
16. A refrigerator cooling system, comprising:
a refrigerant circulation flow path provided with a compressor, a condenser, a throttling device and an evaporator,
wherein the throttling device comprises:
a first three-way valve including three first communication ports in communication with one another, two of the three first communication ports in communication with the refrigerant circulation flow path; and
a throttling branch including a capillary tube, an end of the throttling branch in communication with a remaining first communication port, another end of the throttling branch in communication with the evaporator,
wherein:
the throttling device has a throttling working mode and a defrosting working mode, and a working mode of the throttle device is configured to switch between the throttling working mode and the defrosting working mode;
in response to the throttling device being in the throttling working mode, the first three-way valve switches the refrigerant on the refrigerant circulation flow path from the condenser to flow through the throttling branch, and then flow through the evaporator; and
in response to the throttling device being in the defrosting working mode, the first three-way valve switches the refrigerant on the refrigerant circulation flow path from the condenser to directly flow through the evaporator; and
wherein the condenser has a first heat release mode corresponding to the throttling working mode and a second heat release mode corresponding to the defrosting working mode, and a heat release amount of a refrigerant flowing through the condenser in the second heat release mode is smaller than a heat release amount of the refrigerant flowing through the condenser in the first heat release mode.