Two-stage rotary compressor and refrigeration cycle device having same

Abstract

The invention discloses a two-stage rotary compressor and a refrigeration circulating device provided with the two-stage rotary compressor. The two-stage rotary compressor comprises a gas ejector pipe, a casing, two cylinders, a piston and a sliding piece, wherein a liquid storing device is arranged outside the casing, a gas ejecting chamber is arranged inside the casing, and the gas ejecting chamber is respectively connected with the liquid storing device and the gas ejector pipe; the two cylinders are both arranged inside the casing and partitioned away from each other in the vertical direction, one of the cylinders is communicated with the gas ejecting chamber and the other cylinder is communicated with the liquid storing device and provided with a sliding piece slot and a compression chamber which extend in the radial direction, and the exhaust port of the compression chamber is communicated with the gas ejecting chamber; the piston is arranged inside the compression chamber and can roll along the inner wall of the compression chamber; the sliding piece is arranged inside the sliding piece slot movably and the outer end of the sliding piece and the inner wall of the sliding piece slot together define a back pressure chamber, the back pressure chamber is communicated with the gas ejecting chamber, the sliding piece is constructed to be accommodated into the sliding piece slot when the gas ejecting chamber is communicated with the liquid storing device, and the inner end of the sliding piece props against the piston when the gas ejecting chamber is communicated with the gas ejector pipe. The two-stage rotary compressor provided by the invention is excellent in performance and high in reliability.

Description

technical field [0001] The invention relates to the field of electrical appliances, in particular to a two-stage rotary compressor and a refrigeration cycle device with the same. Background technique [0002] It is pointed out in the related art that when the load of the refrigeration cycle device such as the air conditioner is large, such as ultra-low temperature heating, due to the large specific volume of the refrigerant, the mass flow rate of the compressor suction decreases, which not only leads to a significant reduction in the heating capacity of the compressor, but at the same time, Due to the decrease of mass flow rate, it is difficult to return the oil, and the heat taken away by the refrigerant is reduced, which will easily lead to the wear of the compressor pump body and the decrease of the reliability of the motor, and the energy efficiency of the system is low. Contents of the invention [0003] The present invention aims to solve one of the technical problem...

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Problems solved by technology

[0002] It is pointed out in the related art that when a refrigeration cycle device such as an air conditioner has a large load, such as ultra-low temperature heating, due to the large specific volume of the refrigerant, the mass flow rate of the compressor suction decreases, which not only leads to a significant reduction in the heating capacity of the compressor, but at the same time, Due to the decrease of mass flow rate, it is difficult to return the oil, and the heat taken away by the refrigerant is reduced, which will easily lead to the wear of the compressor pump body and the decrease of the reliability of the motor, and the system energy efficiency is low

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