Compressor

1. A compressor comprising:

a first scroll member including a first end plate defining first and second sides opposite one another, a primary discharge passage extending through said first and second sides, a secondary discharge passage extending through said first and second sides and located radially outward from said primary discharge passage, a first spiral wrap extending from said first side;

a second scroll member including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with said first spiral wrap to form a series of compression pockets;

a driveshaft including an eccentric portion coupled with said second scroll member;

a hub plate mounted to said first scroll member and including a hub discharge passage extending therethrough and in fluid communication with said primary discharge passage, a first side of said hub plate overlying said second side of said first end plate of said first scroll member and including a valve guide extending axially toward said first end plate of said first scroll member, a second side of said hub plate including an annular hub surrounding said hub discharge passage and an annular rim surrounding said annular hub and defining an annular chamber therebetween, said hub plate including an aperture opening into said annular chamber; and

a valve member disposed radially outward relative to said valve guide and movable between open and closed positions, said valve member closing said secondary discharge passage when in the closed position and opening said secondary discharge passage when in the open position.

2. The compressor of claim 1 , 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.

3. The compressor of claim 1 , wherein said first end plate of said first scroll member includes an aperture located radially outward from said secondary discharge passage and in communication with one of said compression pockets, said aperture in said first end plate of said first scroll member is in communication with said aperture in said hub plate.

4. The compressor of claim 1 , 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.

5. The compressor of claim 1 , wherein said annular central hub surrounds a plurality of curved slots.

6. The compressor of claim 1 , further comprising a plurality of threaded fasteners extending through said hub plate and threadably engaging said first end plate of said first scroll member to secure said hub plate to said first end plate of said first scroll member.

7. 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.

8. 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.

9. A compressor comprising:

a shell;

a first scroll member disposed within said shell and including a first end plate defining first and second sides opposite one another, a primary discharge passage extending through said first and second sides, a secondary discharge passage extending through said first and second sides and located radially outward from said primary discharge passage, and a first spiral wrap extending from said first side;

a second scroll member including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with said first spiral wrap to form compression pockets; and

a hub plate mounted to said first scroll member 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 extending axially toward said first spiral wrap; 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 and 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;

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.

10. The compressor of claim 9 , 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.

11. The compressor of claim 10 , wherein said first end plate includes a first aperture located radially outward from said secondary discharge passage and in communication with one of said compression pockets, said hub plate including a second aperture in communication with said first aperture and said annular chamber.

12. The compressor of claim 11 , 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.

13. The compressor of claim 9 , wherein said annular central hub surrounds a plurality of curved slots.

14. The compressor of claim 9 , wherein the first scroll member is a non-orbiting scroll member.

15. The compressor of claim 9 , 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.

16. The compressor of claim 9 , further comprising a primary discharge valve movable between open and closed positions to allow and restrict fluid flow through said hub discharge passage.

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

18. A compressor comprising:

a shell;

a first scroll member disposed within said shell and including a first end plate defining first and second sides opposite one another, a primary discharge passage extending through said first and second sides, a secondary discharge passage extending through said first and second sides and located radially outward from said primary discharge passage, and a first spiral wrap extending from said first side;

a second scroll member including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with said first spiral wrap to form compression pockets; and

a hub plate mounted to said first scroll member and including first and second sides opposite one another and having a hub discharge passage extending therethrough and in fluid communication with said primary discharge passage, said first side of said hub plate facing said second side of said first end plate and including a valve guide disposed adjacent said hub discharge passage and extending axially toward said first spiral wrap; and

a valve member retained by said valve guide for axial movement between open and closed positions, said valve member closing said secondary discharge passage when in the closed position to restrict fluid communication between said secondary discharge passage and said hub discharge passage and axially spaced from said secondary discharge passage when in the open position to allow fluid communication between said secondary discharge passage and said hub discharge passage;

wherein said second side of 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 said second side of said first end plate includes a recess surrounding said primary discharge passage, said valve member abutting an end surface of said recess in the closed position and spaced apart from the end surface of said recess in the open position, said recess defining a fluid passageway extending radially through said valve guide, said secondary discharge passage being in fluid communication with said primary discharge passage via said fluid passageway when said valve member is in the open position.