A rolling rotor two-stage compressor

Abstract

The invention discloses a rolling rotor type twin-stage compressor which comprises a first-stage air cylinder, a first-stage exhaust cavity, an enthalpy increase component and a second-stage air cylinder; the first-stage exhaust cavity is communicated with an exhaust opening of the first-stage air cylinder and communicated with an air sucking opening of the second-stage air cylinder and an outlet of the enthalpy increase component through a middle flow channel; the displacement of the first-stage air cylinder is V1, the volume of the first-stage exhaust cavity is V2, and the sum of the volume of an enthalpy increase component cavity and the volume of the middle flow channel is the volume of a medium pressure cavity and is recoded as V5, wherein 1<V2:V1<7, and 3<V5:V1<15. By means of the rolling rotor type twin-stage compressor, pressure fluctuation of an air supplement pipe one-way valve can be lowered, and vibration noise of a one-way valve core is eliminated.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a rolling rotor type two-stage compressor. Background technique [0002] Most of the existing rotor-type two-stage enthalpy-increasing compressors adopt the structure of a built-in intermediate chamber, and the medium-pressure refrigerant is directly injected into the intermediate chamber through the pipeline. When the system is running, in order to prevent the refrigerant in the intermediate chamber from pouring back, a check valve is usually installed on the pipeline between the enthalpy inlet of the compressor and the flash evaporator, such as figure 1 and Figure 6 As shown, the check valve is installed between the solenoid valve and the enthalpy increasing part. When this type of double-stage enthalpy-increasing compressor is working, the low-pressure refrigerant is compressed by the first-stage cylinder and discharged into the middle chamber, and then sucked into the ...

AI Technical Summary

Problems solved by technology

Because the exhaust process of the first-stage cylinder is intermittent, the pressure in the intermediate chamber will fluctuate, and this fluctuation in the pressure in the intermediate chamber will be transmitted to the one-way valve through the air supply pipe, and cause the vibration of the one-way valve spool, thus Abnormal noise, etc.

On the other hand, because the intermediate pressure of the system is set too high or the control is unstable, it will also lead to liquid in the supplementary air, so that too much liquid refrigerant enters the intermediate cavity and the secondary cylinder, forming a liquid shock, resulting in a decrease in the reliability of the compressor

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