Scroll compressor

Abstract

Provided is a highly reliable scroll compressor which can supply oil to a back pressure chamber even during low pressure ratio conditions. A scroll compressor comprising a stationary scroll, and a revolving scroll that forms a compression chamber by revolving in a relative manner with respect to the stationary scroll, a back pressure chamber for pushing the revolving scroll into the stationary scroll being formed in the back surface of the revolving scroll relative to the stationary scroll; wherein the scroll compressor is provided with a back pressure valve or a back pressure hole for regulating the pressure of the back pressure chamber, a first oil supply means for supplying oil to the back pressure chamber from a discharge pressure space where a compressed refrigerant from a compression chamber is discharged, and a second oil supply means for supplying oil from the back pressure chamber either to the compression chamber or to an intake chamber formed in the intake side of the compression chamber.

Description

technical field [0001] The present invention relates to a scroll compressor. Background technique [0002] As the background art of this technical field, there is Japanese Unexamined Patent Publication No. 9-228968 (Patent Document 1). In this publication, it is described that "a scroll compressor is characterized in that a high-pressure oil pressure chamber and a low-pressure chamber are provided with a high-pressure oil pressure chamber and a low-pressure chamber through a sealing part on the mirror plate back part of the orbiting scroll. A hole with a diameter smaller than the width of the sealing ring of the sealing part is provided on the back surface, and an oil leakage mechanism is formed in which the oil in the oil pressure chamber is accumulated in the hole as the orbiting scroll with the hole moves. and discharge across the seal ring at the low-pressure chamber side" (cf. claim 1). [0003] As another background art, there is JP 2011-58439 A (Patent Document 2). ...

AI Technical Summary

Problems solved by technology

[0010] Since both Patent Documents 1 and 2 use the differential pressure between the back pressure chamber and the discharge space to supply oil to the back pressure chamber, under low pressure ratio conditions, the pressure in the discharge space becomes smaller, so the back pressure and discharge pressure become Possibility of not being able to supply oil from the exhaust pressure space to the back pressure chamber

If the oil cannot be supplied to the back pressure chamber in this way, the sliding part of the Oldham Ring cannot be lubricated, and the oil quantity required for the sealing of the compression chamber cannot be ensured, the leakage loss increases, and the efficiency of the compressor decreases

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