US 12,352,471 B2
Zero-load output non-stop control method and apparatus, and unit
Hua Liu, Zhuhai (CN); Zhiping Zhang, Zhuhai (CN); Zhongkeng Long, Zhuhai (CN); Zhiliang Luo, Zhuhai (CN); Bing Zhang, Zhuhai (CN); and Mingzhi Zhao, Zhuhai (CN)
Assigned to GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI, Zhuhai (CN)
Appl. No. 17/627,046
Filed by GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI, Qianshan Zhuhai (CN)
PCT Filed Dec. 24, 2019, PCT No. PCT/CN2019/128064
§ 371(c)(1), (2) Date Jan. 13, 2022,
PCT Pub. No. WO2021/051699, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 201910871922.2 (CN), filed on Sep. 16, 2019.
Prior Publication US 2022/0275974 A1, Sep. 1, 2022
Int. Cl. F25B 1/047 (2006.01); F25B 41/20 (2021.01); F25B 41/31 (2021.01)
CPC F25B 1/047 (2013.01) [F25B 41/20 (2021.01); F25B 41/31 (2021.01); F25B 2600/2513 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A load control device, comprising:
a three-way valve, provided at an exhaust outlet of a compressor;
a mixing tank, provided between a suction inlet of the compressor and a condenser, and configured to mix refrigerant discharged from the compressor with refrigerant throttled through the condenser;
a first electronic expansion valve, provided on a first pipeline between the condenser and the mixing tank, and configured to control an amount of the refrigerant throttled by the condenser and entering the mixing tank;
an electromagnetic valve, provided on a second pipeline between the three-way valve and the mixing tank, and configured to control an amount of the refrigerant discharged from the compressor and directly entering the mixing tank;
a second electronic expansion valve, provided between the condenser and an evaporator, and configured to control an amount of refrigerant throttled by the condenser and entering the evaporator; and
a controller configured to:
compare a predetermined target load to a minimum adjustable load of the compressor for obtaining a comparison result;
control ON or OFF of the first electronic expansion valve, the second electronic expansion valve and the electromagnetic valve according to the comparison result;
wherein, the first electronic expansion valve is provided on the first pipeline between the condenser and the mixing tank, and the second electronic expansion valve is provided between the condenser and the evaporator, and the electromagnetic valve is provided on the second pipeline between the compressor and the mixing tank.
 
2. A load control method, applied to a load control device comprising:
a three-way valve, provided at an exhaust outlet of a compressor;
a mixing tank, provided between a suction inlet of the compressor and a condenser, and configured to mix refrigerant discharged from the compressor with refrigerant throttled through the condenser;
a first electronic expansion valve, provided on a first pipeline between the condenser and the mixing tank, and configured to control an amount of the refrigerant throttled by the condenser and entering the mixing tank;
an electromagnetic valve, provided on a second pipeline between the three-way valve and the mixing tank, and configured to control an amount of the refrigerant discharged from the compressor and directly entering the mixing tank; and
a second electronic expansion valve, provided between the condenser and an evaporator, and configured to control an amount of refrigerant throttled by the condenser and entering the evaporator;
the method comprising:
comparing a predetermined target load to a minimum adjustable load of the compressor for obtaining a comparison result;
controlling ON or OFF of the first electronic expansion valve, the second electronic expansion valve and the electromagnetic valve according to the comparison result;
wherein, the first electronic expansion valve is provided on the first pipeline between the condenser and the mixing tank, and the second electronic expansion valve is provided between the condenser and the evaporator, and the electromagnetic valve is provided on the second pipeline between the compressor and the mixing tank.
 
9. A water-cooled screw unit, comprising the load control device according to claim 1.
 
10. A non-transitory computer-readable storage medium, storing a computer program, wherein the program, when executed by a processor, implements the method according to claim 2.