Patent ID: 6468029
Filing Date: 2002-10-22
Classification: F04D

Abstract:
A pump device for pumping a fluid, comprising:a housing having a single cylindrically shaped cavity, said cavity having a length and having an inner wall; a plurality of inlet ports formed in said housing for receiving said fluid into said cavity; a single outlet port formed in said housing for discharging said fluid from said cavity; each of said inlet ports having an opening size that is larger than an opening size of the outlet port; a shaft which extends along the length of said cavity and which is rotatably mounted to said housing; an impeller mounted to said shaft in said housing and residing in said cavity, said impeller having a main portion and a plurality of helixes that extend above said main portion, wherein said plurality of helixes are adjacent and interleaved with each other and continuous along a length of said impeller, and wherein the helixes of said impeller are uniform in pitch, depth and spacing between helixes, wherein upon rotation of said impeller said fluid is received from the inlet ports at an inlet end of said impeller and discharged from said outlet port at an outlet end of said impeller; said shaft attached to the main portion of the impeller, and extending beyond the main portion of the impeller at the inlet end thereof; wherein, the plurality of inlet ports are disposed symmetrically about the shaft adjacent said inlet end preceding an end of said impeller at an angle of approximately 45 degrees relative to the shaft; wherein, the outlet port is disposed adjacent an outlet end of said impeller and expels the fluid at an angle of approximately 90 degrees relative to said shaft.