Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Passage or casing attached removable liner or wear member
Reexamination Certificate
1999-06-30
2001-02-27
Lopez, F. Daniel (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Passage or casing attached removable liner or wear member
C415S206000
Reexamination Certificate
active
06193463
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to cast compressor housings for centrifugal compressors. More particularly, the invention provides a die casting and method for providing a housing having a true volute shape for the compressor outlet.
2. Description of the Related Art
Housings for radial compressors are typically cast aluminum parts which are manufactured using a sand cast or p-mold technique due to the volute shape required in the compressor outlet duct for aerodynamic performance. Previously, the use of die casting was not employed because a true volute shape for the outlet duct could not be achieved, which penalized aerodynamic performance.
Die casting is a very desirable process for volume production due to the inherent dimensional stability and reproducibility for cast parts as well as the material properties achieved by die cast aluminum. Finer tolerances and net shape requirements are more easily obtained with die casting as opposed to alternate techniques. Die casting additionally provides much higher production volume capability compared to the other casting processes. It is, therefore, desirable to provide a die cast compressor housing having a true volute shape in the outlet duct
SUMMARY OF THE INVENTION
The present invention provides a die cast compressor housing that includes an outer shell having a partial outer circumferencial volute wall portion and a projection surrounding the circumference of an aperture in the shell. An insert having a first portion with a substantially cylindrical outer wall is received in the aperture in the outer shell and includes an air inlet. The insert has a second portion extending radially outwardly and including a mating projection for engagement with the outer shell projection to form an inner circumferencial volute wall portion. A backplate has a third projection adjacent its outer circumference that is received in a relief in the outer shell and completes the outer circumferncial volute wall portion. The outer shell projection has a first land engaging a second land on the mating projection, the first and second lands spirally descending relative to a datum and the relief has a third land in spaced relation to a fourth land on the third projection, the third and fourth lands spirally descending relative to the datum.
REFERENCES:
patent: 3574478 (1971-04-01), Toth, Jr. et al.
patent: 5246352 (1993-09-01), Kawakami
Adeff George A.
Marr Christopher S.
Allied-Signal Inc.
Fischer Felix L.
Lopez F. Daniel
McAleenan James M
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