초록 ▼

A scroll-type compressor constituted by a stationary scroll and a revolving scroll, and an electric motor for causing a revolving motion of the revolving scroll are disposed in a closed container. The scroll-type compressor has openings which are adapted to permit fluid compression pockets between t

A scroll-type compressor constituted by a stationary scroll and a revolving scroll, and an electric motor for causing a revolving motion of the revolving scroll are disposed in a closed container. The scroll-type compressor has openings which are adapted to permit fluid compression pockets between two scrolls to be communicated with the space inside the closed container when the pressure in the pockets have been increased to a predetermined pressure intermediate between the suction and discharge pressures, so that the pressure in the closed container may be maintained at the same level as the above-mentioned predetermined pressure. The bottom part of the closed container constitutes an oil well where the lubricating oil is stored. This oil well is connected to the suction side of the compressor through an oil feed passage constituted by a capillary tube, so that the oil is fed to the compressor due to the pressure difference between the space inside the closed container and the inlet side of the compressor. An oil separating tank is disposed at the discharge side of the compressor. The lubrication oil separated by this oil separating tank is returned back into the closed container by the pressure differential between the discharge side of the compressor and the interior of the closed container.

대표청구항 ▼

A scroll-type fluid displacement apparatus having a scroll-type fluid displacement means including a stationary scroll and a revolving scroll, an electric motor for driving said revolving scroll, a closed container containing said fluid displacement and said electric motor, and lubricating oil circu

A scroll-type fluid displacement apparatus having a scroll-type fluid displacement means including a stationary scroll and a revolving scroll, an electric motor for driving said revolving scroll, a closed container containing said fluid displacement and said electric motor, and lubricating oil circulating means for said fluid displacement means, and means provided in in one of the stationary scroll and revolving scroll for enabling a pressure in the closed container to be maintained at a pressure intermediate a suction and discharge pressure of the apparatus, wherein said lubricating oil circulating means include: means provided in said container and adapted for storing said lubricating oil; a first lubricating oil passage opened at its one end into said lubricating oil stored in the lubricating oil storing means in said closed container and connected at its other end to the suction side of said scroll-type fluid displacement means so as to enable lubricating oil to be drawn into the scroll type fluid displacement means and form a sealing oil film between the stationary and revolving scrolls; a second lubricating oil passage connected at its one end to the discharge side of said scroll-type fluid displacement means and opening at its other end to the space inside said closed container; and an oil separating means disposed at an intermediate portion of said second lubricating oil passage.