US 12,066,225 B2
Method and device for controlling pressure of units with height drop, and air conditioner device
Yuhai Su, Guangdong (CN); Jianguo Xiong, Guangdong (CN); Shiqiang Zhang, Guangdong (CN); Huachao Jiao, Guangdong (CN); Lianfa Wu, Guangdong (CN); and Han Gao, Guangdong (CN)
Assigned to Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
Filed by Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
Filed on Oct. 9, 2020, as Appl. No. 17/066,784.
Application 17/066,784 is a continuation of application No. PCT/CN2018/121225, filed on Dec. 14, 2018.
Claims priority of application No. 201810311790.3 (CN), filed on Apr. 9, 2018.
Prior Publication US 2021/0025628 A1, Jan. 28, 2021
Int. Cl. F25B 41/31 (2021.01); F25B 49/02 (2006.01); F24F 11/30 (2018.01); F24F 110/10 (2018.01)
CPC F25B 41/31 (2021.01) [F25B 49/02 (2013.01); F24F 11/30 (2018.01); F24F 2110/10 (2018.01); F25B 2600/2513 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for controlling pressure of units with height drop, comprising:
monitoring an operating mode of the units;
obtaining an operating parameter corresponding to the operating mode according to the operating mode, comprising:
obtaining, by a device configured to monitor operating parameters while in a cooling mode, an evaporation temperature of refrigerant of an indoor unit of the units, an opening degree of an electronic expansion valve (EEV) of the indoor unit, a suction pressure of an outdoor unit of the units, and a temperature of exhaust gas, in a case where the operating mode is the cooling mode; and
adjusting an opening degree of an EEV according to the operating parameter, comprising:
adjusting an opening degree of an EEV of the outdoor unit to increase, to raise an intermediate pressure located from a posterior of the EEV of the outdoor unit to an anterior of the EEV of the indoor unit, in a case where the operating parameter satisfies a first preset condition, wherein the first preset condition is:
the opening degree of the EEV of the indoor unit is smaller than a preset opening degree value, or a superheat degree of the indoor unit determined according to the evaporation temperature of refrigerant of the indoor unit is smaller than a preset superheat value,
the suction pressure of the outdoor unit is smaller than a preset pressure value, and
a superheat degree of the exhaust gas determined according to the temperature of the exhaust gas is greater than a preset exhaust gas value; and
adjusting the opening degree of the EEV of the outdoor unit to decrease, to reduce the intermediate pressure, in a case where the operating parameter satisfies a second preset condition, wherein the second preset condition is:
the opening degree of the EEV of the indoor unit is greater than the preset opening degree value or the superheat degree of the indoor unit determined according to the evaporation temperature of refrigerant of the indoor unit is greater than the preset superheat value,
the suction pressure of the outdoor unit is greater than the pressure preset value, and
the superheat degree of the exhaust gas determined according to the temperature of the exhaust gas is smaller than the preset exhaust gas value;
wherein the outdoor unit and the indoor unit have the height drop therebetween,
wherein, in the case where the operating parameter satisfies the first preset condition, it is determined that the intermediate pressure is too low, and
wherein, in the case where the operating parameter satisfies the second preset condition, it is determined that the intermediate pressure is too high.