Displacement machine employing a plurality of intermeshing spiral displacement bodies

A displacement machine for compressible media, comprising:

• a stationary housing;
• a middle disk mounted for eccentric movement within the housing;
• and two side disks mounted for eccentric movement within the housing, one of said side disks being mounted on each side of said middle disk, said middle disk having two symmetrically disposed spiral displacement bodies mounted on both sides thereof that are offset substantially 180.degree. from one another, the two displacement bodies mounted on each side of the middle disk being disposed in mirror symmetry with respect to one another and having spiral centers that are offset with respect to one another, the two displacement bodies mounted on each side of the middle disk having a center, an axis connecting the centers of the two displacement bodies mounted on each side of the middle disk passing through a center of gravity of the middle disk, each side disk having two symmetrically disposed spiral displacement bodies mounted on one side thereof that are offset substantially 180.degree. from one another, the spiral displacement bodies mounted on one side disk intermeshing and cooperating with the displacement bodies mounted on one side of the middle disk and the displacement bodies mounted on the other side disk intermeshing and cooperating with the displacement bodies mounted on the opposite side of the middle disk so that the cooperating displacement bodies form independent single-pitch spiral systems and so that during operation each point of a displacement body executes a circular displacement motion, the spiral displacement bodies having a curvature that is dimensioned such that opposed surfaces of cooperating spiral displacement bodies substantially contact one another at at least one sealing line that progresses continuously during operation, the cooperating spiral displacement bodies each having a different wrap angle such that the spiral displacement body having the greater wrap angle defines a feed chamber and has spiral portions lying radially inwardly and radially outwardly of the cooperating spiral displacement body.