Patent ID: 6988876

Claim:
A scroll type fluid machinery comprising: a first fluid volume changing mechanism comprising a first stationary scroll and a first orbiting scroll, wherein the first orbiting scroll is associated with the first stationary scroll to allow the first orbiting scroll to orbit with respect to the first stationary scroll; a second fluid volume changing mechanism comprising a second stationary scroll and a second orbiting scroll, wherein the second orbiting scroll is associated with the second stationary scroll to allow the first orbiting scroll to orbit with respect to the second stationary scroll; and a plurality of orbiting units, each of the orbiting units comprising: a rotating member that is arranged to rotate relative to the first and second stationary scrolls, and a thrust-canceling shaft connected to the first orbiting scroll and to the second orbiting scroll, wherein the trust-canceling shaft is rotatably supported in a through-hole in the rotating member, which hole is eccentric relative to the axis of rotation of the rotating member, wherein the orbiting units are arranged to form one or more parallelogram linkages for preventing the first and second orbiting scrolls from self-rotation, and wherein at least one of the orbiting units is used to transmit a driving force to or from the first and the second fluid volume changing mechanisms.