SCROLL-TYPE FLUID DISPLACEMENT APPARATUS INCLUDING AN ECCENTRIC CRANK MECHANISM HAVING AN ELONGATED SHAFT

摘要

A scroll-type fluid displacement apparatus including at least two scrollmembers, with each scroll member having a plate and a spiralinvolute extending from the plate. The spiral involutes mesh to define fluidvoids between the scroll members that become smaller towardsthe center of the scroll members. The apparatus also includes an eccentriccrank mechanism having an elongated shaft with an eccentricportion. The elongated shaft is connected at one end to a motor and at anotherend to a machine, while the eccentric portion is rotatablyreceived by one of the scroll members such that the scroll members will orbitwith respect to one another as the shaft is turned by themotor. The apparatus also includes at least one eccentric guide for assistingthe eccentric crank mechanism in retaining the scroll membersin an orbiting relationship. According to one embodiment, the eccentric guidecomprises a second eccentric crank mechanism having anelongated shaft with an eccentric portion rotatably received by one of thescroll members. According to another embodiment, the elongatedshaft of the second eccentric crank mechanism is connected at one end to amotor and at another end to a machine.