Patent ID: 6527505
Filing Date: 2003-03-04
Classification: F02M,F04D,F05B

Abstract:
A pump comprising:a housing having a body piece and a cover piece forming an internal chamber; an impeller disposed within said internal chamber; an inlet hole defined within one of said cover piece and said body piece; an outlet hole defined within the other of said body piece and said cover piece; a first main semicircular channel fluidly connected to said internal chamber and extending annularly around at least a portion, wherein said first main semicircular channel expands outwardly at one end and terminates in an upward incline ramped towards said impeller; a second main semicircular channel fluidly connected to said internal chamber and extending annularly around at least a portion; and at least one annular groove extending around a periphery of at least one of said body piece and said cover piece, said at least one annular groove spaced radially outwardly from an edge of said impeller and being fluidly connected to at least one of said first main semicircular channel and said second main semicircular channel.