Guangdong Meizhi Compressor Co., Ltd.

Yongjun Fu

Weimin Xiang

Hong Guo

Liyu Zheng

Cheng Zhang

Guoyong Yang

Xingbiao Zhou

Xinjie Ren

Siqing Liao

Wanjie Song

A rotary compressor () and a refrigeration cycle device () having same are provided. The rotary compressor comprises: a liquid reservoir (), a first direction control assembly (), and a compression mechanism. The compression mechanism comprises two cylinders and two gas injection holes, in which a sliding vane of one cylinder is pressed against an outer circumferential wall of a piston in the cylinder and a gas injection hole is used for injecting a refrigerant to the cylinder, while the sliding vane of the other cylinder is optionally in contact with or separate from the piston in the cylinder, the other gas injection hole is used for unidirectionally injecting the refrigerant into the cylinder; a first valve port () of the first direction control assembly () is connected to the gas suction port of the other cylinder, a second valve port () thereof is connected to liquid reservoir (), a third valve port () thereof is in communication with the exhaust hole, and the second valve port () and the third port () are optionally in communication with the first valve port ().

Rotary compressor and refrigeration cycle device having same

A compression device includes an air cylinder (); an upper bearing () and a lower bearing (); a piston () which defines a working space; a first slide vane () and a second slide vane () which separate the working space into a first and a second working chamber; a first air suction port () and a second air suction port () both of which are in communication with the working space; and a first air discharge port () and a second air discharge port () both of which are in communication with the working space. The first and the second air suction port satisfy the following condition: 0.25&#x2264;(V/S)*(S/V)&#x2264;4, where VI and Vare respectively the maximum volume of the first and the second working chamber, and Sand Sare respectively the opening area of the first and the second air suction port.

Rotary compressor and compression unit thereof, and air conditioner

A refrigeration cycle device and a two-stage rotary compressor thereof. The two-stage rotary compressor includes a housing with a gas injection chamber and two cylinders disposed therein; the gas injection chamber connected to a liquid reservoir disposed outside of the housing and a gas injection pipe; a first cylinder in communication with the gas injection chamber; a second cylinder connected to the liquid reservoir, and having a sliding vane groove and a compression chamber with a piston disposed therein in communication with the gas injection chamber; a sliding vane, received in the sliding vane groove when the gas injection chamber is in communication with the liquid reservoir, with an outer end and the sliding vane groove defining a backpressure chamber in communication with the gas injection chamber; and with an inner end abutting against the piston when the gas injection chamber is in communication with the gas injection pipe.

Two-stage rotary compressor and refrigeration cycle device having same

The present disclosure provides a method and a device for controlling a power factor on motor side and a system having the same, and the method includes: controlling the motor using a control approach of Id'=0 so as to obtain quadrature-axis voltage Uq&#x2032; and direct-axis voltage Ud&#x2032; in a virtual coordinate system of a current control cycle; calculating a first control value according to Uq&#x2032; and Ud&#x2032;; obtaining a power factor control target value, and calculating a target control value according to the power factor control target value; performing a PI control on a difference between the target control value and the first control value so as to obtain a coordinate deviation angle, and overlapping the coordinate deviation angle to a motor angle of the current control cycle so as to build a virtual coordinate system of a next control cycle, such that the power factor on the motor side is controllable.

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Foshan, China

Yongjun Fu