Dual volume-ratio scroll machine
AssigneeCopeland Corporation
InventorsStephen M. Seibel, Michael M. Perevozchikov, Norman Beck
Life of this patent
Estimating the term…
Abstract
The present invention provides the art with a scroll machine which has a plurality of built-in volume ratios along with their respective design pressure ratios. The incorporation of more than one built-in volume ratio allows a single compressor to be optimized for more than one operating condition. The operating envelope for the compressor will determine which of the various built-in volume ratios is going to be selected. Each volume ratio includes a discharge passage extending between one of the pockets of the scroll machine and the discharge chamber. All but the highest volume ration utilize a valve controlling the flow through the discharge passage.
Claims36
A scroll machine comprising:
- a first scroll member having a first spiral wrap projecting outwardly from a first end plate;
- a second scroll member having a second spiral wrap projecting outwardly from a second end plate, said second scroll wrap being interleaved with said first spiral wrap to define a plurality of moving chambers therebetween when said second scroll member orbits with respect to said first scroll member, said moving chamber moving between a suction pressure zone at a suction pressure zone and a discharge pressure zone at a discharge pressure;
- a drive member for causing said second scroll member to orbit with respect to said first scroll member;
- a first biasing chamber defined by one of said first and second scroll members, said first biasing chamber being at a biasing pressure between said suction pressure and said discharge pressure, said biasing pressure biasing said one scroll member towards the other of said first and second scroll members;
- and
- a valve disposed between said biasing chamber and said discharge pressure zone.
A scroll machine comprising:
- a first scroll member having a first spiral wrap projecting outwardly from a first end plate;
- a second scroll member having a second spiral wrap projecting outwardly from a second end plate, said second scroll wrap being interleaved with said first spiral wrap;
- a drive member for causing said second scroll wrap to orbit with respect to said first scroll wrap whereby said spiral wraps create pockets of progressively changing volume between a suction pressure zone at a suction pressure and a discharge pressure zone at a discharge pressure;
- a partition between said discharge pressure zone and said suction pressure zone;
- a first discharge passage disposed between one of said pockets and said discharge pressure zone, said first discharge passage extending through said partition;
- a first valve for opening and closing said first discharge passage;
- and
- a second discharge passage disposed between another one of said pockets and said discharge pressure zone.
A scroll machine comprising:
- a shell;
- first and second scroll member, said scroll members having a first and second end plates and a first and second spiral wraps thereon, respectively, said spiral wraps being intermeshed with each other, said first scroll member defining a first cavity;
- a drive member for causing said scroll members to engage in relative cyclical orbiting motion, said spiral wraps forming successive fluid pockets which move during normal operation between a suction pressure zone and a discharge pressure zone;
- a partition plate separating said suction pressure zone from said discharge pressure zone;
- means defining a fluid path between said discharge pressure zone and said suction pressure zone;
- means for supplying a first intermediate pressurized fluid to said first cavity;
- and
- a first seal mounted on said first scroll member, said first seal engaging said partition plate and isolating said first cavity from said discharge pressure zone of said scroll machine;
- and
- a second seal mounted on said first scroll member, said second seal engaging said partition plate and isolating said first cavity from said suction pressure zone of said scroll machine.
Dependencies are inferred from the claim text.