Press-fit bearing housing with large gas passages
A scroll compressor that includes a housing and scroll compressor bodies disposed in the housing. A motor is disposed within the housing and operably connected to a drive shaft for driving one of the scroll compressor bodies. The drive shaft is rotationally supported at one end by a crankcase which includes a bearing housing and a bearing. The crankcase includes a plurality of openings or gas passages passing through the crankcase, as well as a plurality of generally cylindrical sections positioned respectively between adjacent openings. The cylindrical sections define contact regions which can engage an inner periphery of the housing when the crankcase is mounted therein.
1. A scroll compressor, comprising:
a housing defining an internal cavity, the housing having an inlet and an outlet and a flow path extending between the inlet and the outlet;
scroll compressor bodies disposed within the internal cavity of the housing and along the flow path, the scroll compressor bodies operable to compress a fluid;
a crankcase disposed within the internal cavity and within the flow path between the inlet and the outlet, the crankcase including a plurality of passages centered along a first axis and including a pair of contact regions centered along a second axis generally perpendicular to the first axis, the plurality of passages configured to communicate fluid flowing into the housing from the inlet to the scroll compressor bodies for compression; and
wherein the plurality of passages is only two passages centered on a common center line, with each passage defined between adjacent contact regions, and wherein at least one drainage port is formed in at least one of the plurality of contact regions.
2. The scroll compressor of claim 1 , wherein each of the plurality of passages extends axially through the crankcase and radially inward from a circumference of the crankcase and towards a center of the crankcase.
3. The scroll compressor of claim 2 , wherein each of the plurality of passages has an angular span about the circumference of the crankcase of about 50° to about 80°.
4. The scroll compressor of claim 2 , wherein each of the plurality of passages has an angular span about the circumference of the crankcase of about 60° to about 70°.
5. The scroll compressor of claim 1 , wherein each of the two passages has an angular span about a circumference of the crankcase of a first angle, and each of the two contact regions has an angular span about the circumference of the crankcase of a second angle greater than the first angles.
6. The scroll compressor of claim 5 , wherein the crankcase has a generally I-shaped top profile.