Scroll compressor having hub plate

1. A compressor comprising:

a non-orbiting scroll member including a first end plate and a first spiral wrap, said first end plate including a primary discharge passage and a secondary discharge passage located radially outward relative to said primary discharge passage;

an orbiting scroll member including a second end plate having a second spiral wrap extending therefrom and meshingly with said first spiral wrap;

a hub plate mounted to said non-orbiting scroll member and having a hub discharge passage extending therethrough and in fluid communication with said primary discharge passage, said hub plate including a valve guide disposed adjacent said hub discharge passage;

a valve member disposed radially outward relative to said valve guide and movable relative to said valve guide between open and closed positions, said valve member restricting fluid flow through said secondary discharge passage when in the closed position to restrict fluid communication between said secondary discharge passage and said hub discharge passage, said valve member allowing fluid flow through from said secondary discharge passage when in the open position to allow fluid communication between said secondary discharge passage and said hub discharge passage; and

a floating seal engaging said hub plate and cooperating with said hub plate to define an annular chamber.

2. The compressor of claim 1 , wherein said hub plate includes an annular central hub surrounding said hub discharge passage and an annular rim surrounding said annular central hub.

3. The compressor of claim 2 , further comprising a partition separating a discharge-pressure region from a suction-pressure region of the compressor, wherein said floating seal is engaged with said partition.

4. The compressor of claim 3 , wherein said first end plate includes a first aperture located radially outward from said secondary discharge passage and in communication with a compression pocket defined by said first and second spiral wraps, wherein said hub plate includes a second aperture in communication with said first aperture and said annular chamber.

5. The compressor of claim 4 , wherein said annular chamber is an axial biasing chamber that contains intermediate-pressure working fluid during operation of the compressor that biases said first scroll member axially toward said second scroll member.

6. The compressor of claim 5 , wherein said annular central hub surrounds a plurality of curved slots.

7. The compressor of claim 6 , further comprising a plurality of threaded fasteners extending through said hub plate and threadably engaging said first end plate to secure said hub plate to said first end plate.

8. The compressor of claim 1 , further comprising a primary discharge valve movable between open and closed positions to allow and restrict fluid flow through said hub discharge passage.

9. The compressor of claim 1 , wherein said secondary discharge passage is in fluid communication with said primary discharge passage when said valve member is in the open position.

10. A compressor comprising:

a shell;

a non-orbiting scroll member disposed within said shell and including a first end plate and a first spiral wrap, said first end plate including a primary discharge passage and a secondary discharge passage located radially outward relative to said primary discharge passage; an orbiting scroll member including a second end plate having a second spiral wrap extending therefrom and meshingly with said first spiral wrap;

a driveshaft coupled with said orbiting scroll member;

a motor disposed within said shell and driving said driveshaft; a hub plate mounted to said non-orbiting scroll member and having a hub discharge passage extending therethrough and in fluid communication with said primary discharge passage, said hub plate including a valve guide disposed adjacent said hub discharge passage; and

a valve member disposed radially outward relative to said valve guide and movable relative to said valve guide between open and closed positions, said valve member restricting fluid flow through said secondary discharge passage when in the closed position to restrict fluid communication between said secondary discharge passage and said hub discharge passage, said valve member allowing fluid flow through from said secondary discharge passage when in the open position to allow fluid communication between said secondary discharge passage and said hub discharge passage.

11. The compressor of claim 10 , wherein said hub plate includes an annular central hub surrounding said hub discharge passage and an annular rim surrounding said annular central hub and defining an annular chamber therebetween.

12. The compressor of claim 11 , wherein said annular central hub surrounds a plurality of curved slots.

13. The compressor of claim 11 , further comprising a partition separating a discharge-pressure region from a suction-pressure region of the compressor, and a floating seal located in said annular chamber and engaged with said partition and said hub plate.

14. The compressor of claim 13 , wherein said first end plate includes a first aperture located radially outward from said secondary discharge passage and in communication with a compression pocket defined by said first and second spiral wraps, wherein said hub plate includes a second aperture in communication with said first aperture and said annular chamber.

15. The compressor of claim 14 , wherein said annular chamber is an axial biasing chamber that contains intermediate-pressure working fluid during operation of the compressor that biases said non-orbiting scroll member axially toward said orbiting scroll member.

16. The compressor of claim 10 , further comprising a plurality of threaded fasteners extending through said hub plate and threadably engaging said first end plate to secure said hub plate to said first end plate.

17. The compressor of claim 10 , further comprising a primary discharge valve movable between open and closed positions to allow and restrict fluid flow through said hub discharge passage.

18. The compressor of claim 10 , wherein said secondary discharge passage is in fluid communication with said primary discharge passage when said valve member is in the open position.

19. A compressor comprising:

a shell;

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

an orbiting scroll member including a second end plate having a second spiral wrap extending therefrom and meshingly with said first spiral wrap; and a hub plate fixedly mounted to said non-orbiting scroll member and having a hub discharge passage extending therethrough and in fluid communication with said primary discharge passage, said hub plate including a valve guide disposed adjacent said hub discharge passage;

a valve member disposed radially outward relative to said valve guide and movable relative to said valve guide between open and closed positions, said valve member restricting fluid flow through said secondary discharge passage when in the closed position to restrict fluid communication between said secondary discharge passage and said hub discharge passage, said valve member allowing fluid flow through from said secondary discharge passage when in the open position to allow fluid communication between said secondary discharge passage and said hub discharge passage; and

a primary discharge valve movable between open and closed positions to allow and restrict fluid flow through said hub discharge passage,

wherein said hub plate includes an annular central hub surrounding said hub discharge passage and an annular rim surrounding said annular central hub and defining an annular chamber therebetween,

wherein a floating seal engages said hub plate and cooperates with said hub plate to define said annular chamber,

wherein said first end plate includes a first aperture located radially outward from said secondary discharge passage and in communication with a compression pocket defined by said first and second spiral wraps,

wherein said hub plate including a second aperture in communication with said first aperture and said annular chamber,

wherein said annular central hub surrounds a plurality of curved slots.