초록 ▼

A scroll fluid displacement apparatus with improved tangential and radial sealing means is disclosed. The apparatus comprises scroll members including meshing involutes which are angularly offset such that they define one or more moving fluid pockets of variable volume as well as a theoretical eccen

A scroll fluid displacement apparatus with improved tangential and radial sealing means is disclosed. The apparatus comprises scroll members including meshing involutes which are angularly offset such that they define one or more moving fluid pockets of variable volume as well as a theoretical eccentric separating the involute axes. Tangential and radial sealing is preferably provided by a drive shaft which provides both radial and axial load forces between the involutes. The drive shaft separates the involute centers by a distance not equal to the theoretical eccentric thereby causing the involutes to maintain a radial contacting relationship with each other for effective tangential sealing. Radial sealing is attained by withdrawing a portion of fluid from the fluid pocket of highest pressure for pressurizing a chamber within the drive shaft. The pressure acts against a piston engaging a scroll member which is adapted for axial movement, thereby generating radial sealing forces. The involutes have tips with recessed portions therein for accelerated initial surface wear and improved radial sealing. Idler crank assemblies having axial compliance are provided to maintain the desired angular relationship between the scroll members. In one alternative embodiment, the idler crank assemblies provide for tangential sealing by separating the involute centers by a distance not equal to the theoretical eccentric.

대표청구항 ▼

[ What is claimed is:] [1.] A scroll fluid displacement apparatus comprising:a housing including a circumferential side wall and a first end wall;a motor shaft having a longitudinal axis and extending into said housing, said motor shaft rotatably mounted in said first end wall;a stationary scroll me

[ What is claimed is:] [1.] A scroll fluid displacement apparatus comprising:a housing including a circumferential side wall and a first end wall;a motor shaft having a longitudinal axis and extending into said housing, said motor shaft rotatably mounted in said first end wall;a stationary scroll member fixed to said housing and including a stationary plate having an inboard surface and an outboard surface, and a stationary involute having a center axis and extending from said inboard surface;an orbiting scroll member including an orbiting plate having an inboard surface and an outboard surface, and an orbiting involute having a center axis and extending from said inboard surface of said orbiting plate, wherein said stationary and orbiting involutes mesh to define at least one fluid pocket of variable volume and pressure and a theoretical eccentric between said stationary involute center axis and said orbiting involute center axis;a drive shaft eccentrically mounted to said motor shaft and rotatably mounted to said orbiting plate for orbitally rotating said orbiting scroll member in response to rotation of said motor shaft;wherein said orbiting involute center axis and said stationary involute center axis are separated by an actual eccentric greater than said theoretical eccentric, thereby creating a radially outwardly acting force between said orbiting involute and said stationary involute;an idler crank assembly extending between said stationary scroll member and said orbiting scroll member, said idler crank assembly including a first idler crank rotatably mounted in said orbiting scroll member and a second idler crank rotatably mounted in said stationary scroll member, said first and second idler cranks being operably connected such that the orbit of said first idler crank is relative to the orbit of said second idler crank when said orbiting scroll is orbited; andwherein said idler crank assembly is supported for floating axial movement relative at least one of said stationary and orbiting scroll member, thereby facilitating floating axial movement of said orbiting scroll member relative said stationary scroll member. [22.] A scroll fluid displacement apparatus comprising:a housing including a circumferential side wall and a first end wall;a motor shaft having a longitudinal axis and extending into said housing, said motor shaft rotatably mounted in said first end wall;a stationary scroll member fixed to said housing and including a stationary plate having an inboard surface and an outboard surface, a stationary involute having a center axis and extending from said inboard surface;an orbiting scroll member including an orbiting plate having an inboard surface and an outboard surface, and an orbiting involute having a center axis and extending from said inboard surface of said orbiting plate, wherein said stationary and orbiting involutes mesh to define at least one fluid pocket of variable volume and pressure and a theoretical eccentric between said stationary involute center axis and said orbiting involute center axis;said stationary and orbiting involutes each having a height and a planar tip surface sealingly engaging one of said orbiting plate and said stationary plate of the opposing scroll member, said tip surfaces including recessed portions therein for reducing the surface area contacting one of said orbiting plate and said stationary plate of the opposing scroll member;a drive shaft eccentrically mounted to said motor shaft and rotatably mounted to said orbiting plate for orbitally rotating said orbiting scroll member in response to rotation of said motor shaft;said orbiting scroll member and stationary scroll member supported for floating axial movement relative each other; andwherein said recessed portions facilitate accelerated wear of said tip surfaces and movement of scroll members axially toward each other whereby radial sealing is enhanced between said involutes and said stationary and orbiting plates.