Dual horizontal scroll machine

Abstract

A compressor system includes a pair of compressors located in a common shell. A common drive shaft drives both compressors and the drive shaft is powered by a single motor. One or both of the compressors can be equipped with a pulse width modulated capacity control system and a vapor injection system. When one compressor is equipped with these systems, the capacity can be varied between 50% and 110%. When both compressors are equipped with these systems, the capacity can be varied between 0% and 120%. When operating in the reduced capacity mode, a biasing member positions the non-orbiting scroll and an anti-thrust ring positions the orbiting scroll to reduce noise created during the operation of the compressor.

1 . A scroll machine comprising: 
 a first scroll member having a first end plate and a first spiral wrap extending therefrom;    a second scroll member having a second end plate and a second spiral wrap extending therefrom, said first and second scroll members being positioned with said first and second spiral wraps interleaved with each other;    a first bearing housing supporting said first scroll member; and    a first anti-thrust plate secured to said first bearing housing, said first end plate of said first scroll member being disposed between said first anti-thrust plate and said first bearing housing.    
     
     
         2 . The scroll machine according to  claim 1  wherein said second scroll member is movable with respect to said first bearing housing between a first relationship in which sealing surfaces of said first and second scroll members are in a sealing relationship to close off first fluid pockets and a second relationship where at least one of said sealing surfaces of said first and second scroll members are spaced apart to define a leakage path between two of said first fluid pockets, and said scroll machine further comprises a biasing member for urging said second scroll member towards said second relationship.  
     
     
         3 . The scroll machine according to  claim 1  further comprising a drive shaft rotatably supported by said first bearing housing, said drive shaft being coupled to said first scroll member.  
     
     
         4 . The scroll machine according to  claim 3  further comprising a motor drivingly coupled to said drive shaft.  
     
     
         5 . The scroll machine according to  claim 4  wherein said motor is a variable speed motor.  
     
     
         6 . The scroll machine according to  claim 1  further comprising a capacity modulation system associated with said first and second scroll members.  
     
     
         7 . The scroll machine according to  claim 6  wherein said capacity modulation system includes a pulse width modulation system.  
     
     
         8 . The scroll machine according to  claim 1  further comprising a fluid injection fitting in communication with one of said scroll members for implementing a vapor injection system for said first and second scroll members.  
     
     
         9 . The scroll machine according to  claim 8  further comprising a capacity modulation system associated with said first and second scroll members.  
     
     
         10 . The scroll machine according to  claim 9  wherein said capacity modulation system includes a pulse width modulation system.  
     
     
         11 . The scroll machine according to  claim 1  further comprising: 
 a third scroll member having a third end plate and a third spiral wrap extending therefrom;    a fourth scroll member having a fourth end plate and a fourth spiral wrap extending therefrom, said third and fourth scroll members being positioned with their third and fourth spiral wraps interleaved with each other;    a second bearing housing spaced from said first bearing housing said second bearing housing supporting said third scroll member; and    a second anti-thrust plate secured to said second bearing housing, said third end plate of said third scroll being disposed between said second anti-thrust plate and said second bearing housing.    
     
     
         12 . The scroll machine according to  claim 11  wherein: 
 said second scroll member is movable with respect to said first bearing housing between a first relationship in which sealing surfaces of said first and second scroll members are in a sealing relationship to close off first fluid pockets and a second relationship where at least one of said sealing surfaces of said first and second scroll members are spaced apart to define a leakage path between two of said first fluid pockets; and    said fourth scroll member is movable with respect to said second bearing housing between a first relationship in which sealing surfaces of said third and fourth scroll members are in a sealing relationship to close off second fluid pockets and a second relationship where at least one of said sealing surfaces of said third and fourth scroll members are spaced apart to define a leakage path between two of said second fluid pockets;    said scroll machine further comprises a first biasing member for urging said second scroll member towards said second relationship; and    said scroll machine further comprises a second biasing member for urging said fourth scroll member towards said second relationship.    
     
     
         13 . The scroll machine according to  claim 11  further comprising a driveshaft rotatably supported by said first and second bearing housings, said driveshaft being coupled to said first and third scroll members.  
     
     
         14 . The scroll machine according to  claim 13  further comprising a motor drivingly coupled to said drive shaft, said motor being disposed between said first and second bearing housings.  
     
     
         15 . The scroll machine according to  claim 14  wherein said motor is a variable speed motor.  
     
     
         16 . The scroll machine according to  claim 11  further comprising a first capacity modulation system associated with said first and second scroll members and a second capacity modulation system associated with said third and fourth scroll members.  
     
     
         17 . The scroll machine according to  claim 16  wherein each of said first and second capacity modulation systems include a pulse width modulation system.  
     
     
         18 . The scroll machine according to  claim 11  further comprising a first fluid injection fitting in communication with one of said first and second scroll members for implementing a first vapor injection system for said first and second scroll members and a second fluid injection fitting in communication with one of said third and fourth scroll members for implementing a second vapor injection system for said third and fourth scroll members.  
     
     
         19 . The scroll machine according to  claim 18  further comprising a first capacity modulation system associated with said first and second scroll members and a second capacity modulation system associated with said third and fourth scroll members.  
     
     
         20 . The scroll machine according to  claim 19  wherein each of said first and second capacity modulation systems include a pulse width modulation system.