To provide a two-stage boost compressor capable of surely supplying oil to a sliding section without incurring a decrease in working efficiency.
An oil feeding passage 131d for making the oil circulate from the side of one end to the side of the other end is formed inside a shaft 131; a restriction portion 138 is provided in the oil feeding passage 131d; a high stage-side oil space 190, into which refrigerant oil in an oil storage space 170 under high-pressure refrigerant pressure atmosphere flows, is disposed on the side of the one end of the shaft 131; and a low stage-side oil space 180, into which the refrigerant oil flowing out of the oil feeding passage 131d flows, is disposed on the side of the other end thereof. In addition, when seen from the axial direction of the shaft 131, an area occupied by the shaft 131 exposed in the high stage-side oil space 190 is preset smaller than an area occupied by the shaft 131 exposed in the low stage-side oil space 180. This inhibits generation of a thrust load imposed on the shaft 131 by the action of the pressure of the refrigerant oil, so as to suppress the decrease in the working efficiency.
| WO/2019/149030 | HIGH-PRESSURE PNEUMATIC MACHINE |
| JP2021515136 | Dry vacuum pump |
| JP2005054742 | HERMETIC ROTARY COMPRESSOR |
UCHIDA KAZUHIDE
HARAKAWA YOSHIAKI
MORISHITA TAKAYA
DENSO CORP
Next Patent: TURBINE OF GAS TURBINE ENGINE