DIE CAST COMPRESSOR HOUSING FOR CENTRIFUGAL COMPRESSORS WITH A TRUE VOLUTE SHAPE

摘要

A die cast compressor housing includes an outer shell (10) having a partial outer circumferencial volute wall (32) portion and a projection (34) surrounding the circumference of an aperture (30) in the shell (10) that mates with an insert (12) having a first portion with a substantially cylindrical outer wall that is received in the aperture (30) in the outer shell (10) and includes an air inlet. The insert (12) has a second portion extending radially outwardly and including a mating projection (28) for engagement with the outer shell projection (34) to form an inner circumferencial volute wall portion. A backplate (14) has a third projection (38) adjacent its outer circumference that is received in a relief (40) in the outer shell (10) and completes the outer circumferencial volute wall portion. The outer shell projection (34) has a first land (70) engaging a second land (72) on the mating projection, the first and second lands (70, 72) spirally descending relative to a datum (45) and the relief (40) has a third land (76) in spaced relation to a fourth land (74) on the third projection (38), the third and fourth lands (76, 74) spirally descending respectively relative to the datum (45).