Patent ID: 6082964
Filing Date: 2000-07-04
Classification: F04D,F16J

Abstract:
A pump including:an impeller;a casing defining a pump chamber around said impeller for receiving a fluid discharged from said impeller; anda seal mechanism provided between said impeller and said casing to prevent a fluid from leaking from said pump chamber through an annular space formed between said casing and said impeller, said seal mechanism comprising:an annular seal member for blocking said annular space leaving an annular gap between said impeller and said seal member anda support member provided on said casing for movably supporting said annular seal member, said support member includinga radially outer portion provided radially outside of said annular seal member to limit the movement of said annular seal member in a radial direction, and,first and second radially inner portions provided radially inside of said radially outer portion at the opposite side of said annular seal member to limit the movement of said annular seal member in an axial direction,wherein said radially outer portion is annular and has an inner diameter larger than the outer diameter of said annular seal member and said first and second radially inner portions are annular and have inner diameters smaller than the outer diameter of said annular seal member,said first radially inner portion includes at least one projection projecting therefrom toward said second radially inner portion, andsaid annular seal member includes at least one recess being adapted to limit the movement of said annular seal member about the axis thereof by engagement of the radially extending side walls of the recess with said projection.