Scroll compressor with center hub

1. A compressor comprising:

a shell assembly;

a non-orbiting scroll disposed within the shell assembly and including a first end plate and a first spiral wrap, the first end plate including a primary discharge passage and a secondary discharge passage located radially outward relative to the primary discharge passage;

an orbiting scroll disposed within the shell assembly and including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with the first spiral wrap;

a hub plate mounted to the non-orbiting scroll and including a main body and a central hub extending axially from the main body, wherein the central hub includes a recess and a hub aperture, and wherein the hub aperture is in selective fluid communication with the primary and secondary discharge passages;

a primary discharge valve assembly including a retainer and a primary valve member, wherein the retainer is disposed at least partially within the recess of the hub plate, wherein the retainer includes a retainer aperture in fluid communication with the hub aperture, wherein the primary valve member is slidably engaged with the retainer, wherein when the primary valve member is in a closed position, the primary valve member restricts fluid flow between a discharge chamber and the primary discharge passage, and wherein a first axial end of the retainer contacts an annular ledge, and wherein the hub aperture is disposed radially outward relative to the annular ledge; and

a secondary discharge valve assembly including a secondary valve member disposed between the hub plate and the first end plate, wherein the secondary valve member is movable relative to the hub plate and the first end plate, wherein when the secondary valve member is in an open position, fluid is allowed to flow from the secondary discharge passage around an outer periphery of the retainer of the primary discharge valve assembly and through the hub aperture, and wherein when the secondary valve member is in a closed position, the secondary valve member restricts fluid communication between the secondary discharge passage and the hub aperture of the central hub.

2. The compressor of claim 1 , wherein the first end plate of the non-orbiting scroll includes an annular rim that surrounds an outer periphery of the hub plate and defines a recess in which the hub plate is received.

3. The compressor of claim 2 , further comprising a floating seal assembly at least partially received in the recess defined by the annular rim.

4. The compressor of claim 3 , wherein the floating seal assembly, the annular rim, and the hub plate cooperate to define a biasing chamber that receives intermediate-pressure working fluid from an aperture in the first end plate.

5. The compressor of claim 4 , wherein the primary valve member is a cup-shaped member that slidably engages an inner hub of the retainer.

6. The compressor of claim 5 , wherein the inner hub of the retainer includes a central aperture, and wherein the retainer aperture and the hub aperture are disposed radially outward relative to the central aperture.

7. The compressor of claim 1 , wherein the primary discharge valve assembly includes a spring disposed between the first end plate and a second axial end of the retainer, and wherein the spring biases the retainer into contact with the annular ledge.

8. The compressor of claim 1 , wherein the secondary valve member is a reed valve including a fixed end and a movable end that is resiliently bendable relative to the fixed end.

9. The compressor of claim 1 , further comprising:

a drive bearing formed from a polymeric material; and

a main bearing formed from aluminum,

wherein the drive bearing engages a cylindrical hub of the orbiting scroll and surrounds a crank pin of a crankshaft that drives the orbiting scroll, and

wherein the main bearing rotatably support a main body of the crankshaft.

10. The compressor of claim 1 , wherein the non-orbiting scroll includes at least another secondary discharge passage located radially outward relative to the primary discharge passage, and wherein the hub aperture has a larger area than a sum of areas of the secondary discharge passages.

11. A compressor comprising:

a shell assembly;

a non-orbiting scroll disposed within the shell assembly and including a first end plate and a first spiral wrap, the first end plate including a primary discharge passage and a secondary discharge passage located radially outward relative to the primary discharge passage;

an orbiting scroll disposed within the shell assembly and including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with the first spiral wrap;

a hub plate mounted to the non-orbiting scroll and including a main body and a central hub extending axially from the main body, wherein the central hub includes a recess and a hub aperture, and wherein the hub aperture is in selective fluid communication with the primary and secondary discharge passages;

a primary discharge valve assembly including a retainer and a primary valve member, wherein the retainer is disposed at least partially within the recess of the hub plate, wherein the retainer includes a retainer aperture in fluid communication with the hub aperture, wherein the primary valve member is slidably engaged with the retainer, and wherein when the primary valve member is in a closed position, the primary valve member restricts fluid flow between a discharge chamber and the primary discharge passage; and

a secondary discharge valve assembly including a secondary valve member disposed between the hub plate and the first end plate, wherein the secondary valve member is movable relative to the hub plate and the first end plate, wherein when the secondary valve member is in an open position, fluid is allowed to flow from the secondary discharge passage around an outer periphery of the retainer of the primary discharge valve assembly and through the hub aperture, and wherein when the secondary valve member is in a closed position, the secondary valve member restricts fluid communication between the secondary discharge passage and the hub aperture of the central hub,

wherein the retainer includes external threads that threadably engages internal threads formed on the central hub of the hub plate, and wherein the hub aperture is disposed radially outward relative to the internal threads of the hub plate.

12. The compressor of claim 11 , wherein the first end plate of the non-orbiting scroll includes an annular rim that surrounds an outer periphery of the hub plate and defines a recess in which the hub plate is received.

13. The compressor of claim 12 , further comprising a floating seal assembly at least partially received in the recess defined by the annular rim.

14. The compressor of claim 13 , wherein the floating seal assembly, the annular rim, and the hub plate cooperate to define a biasing chamber that receives intermediate-pressure working fluid from an aperture in the first end plate.

15. The compressor of claim 14 , wherein the primary valve member is a cup-shaped member that slidably engages an inner hub of the retainer.

16. The compressor of claim 15 , wherein the inner hub of the retainer includes a central aperture, and wherein the retainer aperture and the hub aperture are disposed radially outward relative to the central aperture.

17. The compressor of claim 11 , wherein the secondary valve member is a reed valve including a fixed end and a movable end that is resiliently bendable relative to the fixed end.

18. The compressor of claim 11 , further comprising:

a drive bearing formed from a polymeric material; and

a main bearing formed from aluminum,

wherein the drive bearing engages a cylindrical hub of the orbiting scroll and surrounds a crank pin of a crankshaft that drives the orbiting scroll, and

wherein the main bearing rotatably support a main body of the crankshaft.