Low-back-pressure rotation type compressor

Abstract

The invention discloses a low-back-pressure rotation type compressor which comprises a shell, a compression mechanism and a sucking buffer chamber, wherein a gas sucking tube and a gas exhaust tube are arranged on the shell; the compression mechanism is arranged inside the shell; the compression mechanism comprises at least one cylinder; each cylinder comprises a compression cavity; a sucking hole which is communicated with the compression cavity is formed in each cylinder; the sucking buffer chamber is formed inside the shell; a sucking buffer space is defined inside the sucking buffer chamber; the sucking buffer space and the sucking tube are communicated with the sucking hole of each cylinder. Through the adoption of the low-back-pressure rotation type compressor disclosed by the invention, the sucking heating can be reduced as much as possible, the situation that the volume efficiency is degraded as too much lubricating oil enters the compression cavity is avoided, the influence to refrigerant sucking, of air flow disturbance generated when a rotor rotates is avoided, and the refrigerating capacity and the volume efficiency of the compressor are improved.

Description

technical field [0001] The invention relates to the field of refrigeration, in particular to a low back pressure rotary compressor. Background technique [0002] The traditional low-pressure rotary compressor without accumulator in the casing is generally provided with a suction pipe at the upper end or side of the casing, and the low-temperature and low-pressure refrigerant enters the casing from the suction pipe on the upper casing or the side of the casing. Inside, after cooling the motor, it is sucked in from the air intake port of the cylinder, compressed and discharged from the compressor to enter the refrigeration system. During this process, due to the heat dissipation of the motor, the inhaled refrigerant is heated ineffectively, resulting in a low volumetric efficiency of the compressor. [0003] In addition, because the rotor drives the lower balance weight to rotate, the rotation speed is very fast, which disturbs the airflow around the balance weight. When the ...

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Problems solved by technology

During this process, due to the heat dissipation of the motor, the suction refrigerant is heated ineffectively, which makes the volumetric efficiency of the compressor lower.

[0003] In addition, due to the rotation of the balance weight driven by the rotor, the speed is very fast, which disturbs the air flow around the balance weight. When the refrigerant is inhaled as a gas, since the suction port of the cylinder is located under the lower balance weight of the rotor, it will be disturbed by the air flow caused by the rotation of the rotor. Affected, resulting in incomplete suction of refrigerant from the suction port of the cylinder, which will reduce the cooling capacity of the compressor, which in turn will affect the volumetric efficiency of the compressor

[0004] In addition, part of the lubricating oil flows out from the upper outlet of the spiral oil groove inside the main bearing, and flows down from the hub of the main bearing. Driven by the suction gas, it will enter the suction port of the cylinder along with the suction gas, and return from the refrigeration system. The refrigerant will bring back part of the lubricating oil, and will also enter the cylinder suction port along with the inhaled gas. If too much lubricating oil accumulates in the cylinder compression chamber, it will seriously affect the volumetric efficiency, and it will also bring a loss of input power. improve

[0005] In addition, the suction flow path of the traditional low-pressure rotary compressor in the shell is usually not equipped with a suction muffler, so that the noise generated when the refrigerant is sucked cannot be eliminated, so that the overall noise of the compressor is relatively large.

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