US 9,309,895 B2Granted

Closed impeller with a coated vane

AssigneeKennametal Inc.

InventorsDave Siddle, Sudhir Brahmandam, Irene Spitsberg

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Abstract

A closed impeller has a base cover, which has a base interior surface, and a second cover. A vane, which has an inlet distal end and an outlet distal end, is on the base interior surface. The vane has low and high pressure side surfaces wherein they have a low or high pressure midpoint, respectively. A hard coating is on the low and high pressure side surfaces. The hard coating has a minimum low and high pressure coating thickness at their respective midpoints. The minimum low, as well as high, pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum outlet coating thickness at the outlet distal end or the maximum inlet coating thickness at the inlet distal end, respectively.

Claims24

Dependent claims

A closed impeller comprising:

a base cover having a base interior surface;
a second cover;
a vane on the base interior surface, the vane being of a generally arcuate shape and having an inlet distal end and an outlet distal end;
the vane having a low pressure side surface, the low pressure side surface having a low pressure length between the inlet distal end and the outlet distal end, and a low pressure midpoint on the low pressure length approximately midway between the inlet distal end and the outlet distal end;
a hard low pressure coating on the low pressure side surface, the hard low pressure coating having a minimum low pressure coating thickness at the low pressure midpoint, the hard low pressure coating having a maximum low pressure outlet coating thickness at the outlet distal end, and the hard low pressure coating having a maximum low pressure inlet coating thickness at the inlet distal end;
the minimum low pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum low pressure outlet coating thickness at the outlet distal end or the maximum low pressure inlet coating thickness at the inlet distal end;
the vane having a high pressure side surface, the high pressure side surface having a high pressure length between the inlet distal end and the outlet distal end, and a high pressure midpoint on the high pressure length approximately midway between the inlet distal end and the outlet distal end;
a hard high pressure coating on the high pressure side surface, the hard high pressure coating having a minimum high pressure coating thickness at the high pressure midpoint, the hard high pressure coating having a maximum high pressure outlet coating thickness at the outlet distal end, and the hard high pressure coating having a maximum high pressure inlet coating thickness at the inlet distal end;
and
the minimum high pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum high pressure outlet coating thickness at the outlet distal end or the maximum high pressure inlet coating thickness at the inlet distal end.

7 more elements

A coated impeller vane comprising:

a vane substrate and a hard coating;
the vane being of a generally arcuate shape and having an inlet distal end and an outlet distal end;
the vane having a low pressure side surface, the low pressure side surface having a low pressure length between the inlet distal end and the outlet distal end, and a low pressure midpoint on the low pressure length approximately midway between the inlet distal end and the outlet distal end;
a hard low pressure coating on the low pressure side surface, the hard low pressure coating having a minimum low pressure coating thickness at the low pressure midpoint, the hard low pressure coating having a maximum low pressure outlet coating thickness at the outlet distal end, and the hard low pressure coating having a maximum low pressure inlet coating thickness at the inlet distal end;
the minimum low pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum low pressure outlet coating thickness at the outlet distal end or the maximum low pressure inlet coating thickness at the inlet distal end;
the vane having a high pressure side surface, the high pressure side surface having a high pressure length between the inlet distal end and the outlet distal end, and a high pressure midpoint on the high pressure length approximately midway between the inlet distal end and the outlet distal end;
a hard high pressure coating on the high pressure side surface, the hard high pressure coating having a minimum high pressure coating thickness at the high pressure midpoint, the hard high pressure coating having a maximum high pressure outlet coating thickness at the outlet distal end, and the hard high pressure coating having a maximum high pressure inlet coating thickness at the inlet distal end;
and
the minimum high pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum high pressure outlet coating thickness at the outlet distal end or the maximum high pressure inlet coating thickness at the inlet distal end.

6 more elements

A pump comprising:

a pump housing having an inlet and an outlet;
a closed impeller within the pump housing wherein the closed impeller comprising:
a base cover having a base interior surface;
a second cover;
a vane on the base interior surface, the vane being of a generally arcuate shape and having an inlet distal end and an outlet distal end;
the vane having a low pressure side surface, the low pressure side surface having a low pressure length between the inlet distal end and the outlet distal end, and a low pressure midpoint on the low pressure length approximately midway between the inlet distal end and the outlet distal end;
a hard low pressure coating on the low pressure side surface, the hard low pressure coating having a minimum low pressure coating thickness at the low pressure midpoint, the hard low pressure coating having a maximum low pressure outlet coating thickness at the outlet distal end, and the hard low pressure coating having a maximum low pressure inlet coating thickness at the inlet distal end;
the minimum low pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum low pressure outlet coating thickness at the outlet distal end or the maximum low pressure inlet coating thickness at the inlet distal end;
the vane having a high pressure side surface, the high pressure side surface having a high pressure length between the inlet distal end and the outlet distal end, and a high pressure midpoint on the high pressure length approximately midway between the inlet distal end and the outlet distal end;
a hard high pressure coating on the high pressure side surface, the hard high pressure coating having a minimum high pressure coating thickness at the high pressure midpoint, the hard high pressure coating having a maximum high pressure outlet coating thickness at the outlet distal end, and the hard high pressure coating having a maximum high pressure inlet coating thickness at the inlet distal end;
and
the minimum high pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum high pressure outlet coating thickness at the outlet distal end or the maximum high pressure inlet coating thickness at the inlet distal end.

9 more elements

Dependencies are inferred from the claim text.

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Abstract

A closed impeller comprising:

a base cover having a base interior surface;
a second cover;
a vane on the base interior surface, the vane being of a generally arcuate shape and having an inlet distal end and an outlet distal end;
the vane having a low pressure side surface, the low pressure side surface having a low pressure length between the inlet distal end and the outlet distal end, and a low pressure midpoint on the low pressure length approximately midway between the inlet distal end and the outlet distal end;
a hard low pressure coating on the low pressure side surface, the hard low pressure coating having a minimum low pressure coating thickness at the low pressure midpoint, the hard low pressure coating having a maximum low pressure outlet coating thickness at the outlet distal end, and the hard low pressure coating having a maximum low pressure inlet coating thickness at the inlet distal end;
the minimum low pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum low pressure outlet coating thickness at the outlet distal end or the maximum low pressure inlet coating thickness at the inlet distal end;
the vane having a high pressure side surface, the high pressure side surface having a high pressure length between the inlet distal end and the outlet distal end, and a high pressure midpoint on the high pressure length approximately midway between the inlet distal end and the outlet distal end;
a hard high pressure coating on the high pressure side surface, the hard high pressure coating having a minimum high pressure coating thickness at the high pressure midpoint, the hard high pressure coating having a maximum high pressure outlet coating thickness at the outlet distal end, and the hard high pressure coating having a maximum high pressure inlet coating thickness at the inlet distal end;
and
the minimum high pressure coating thickness ranging between about 0.085 and about 0.8 of either one of the maximum high pressure outlet coating thickness at the outlet distal end or the maximum high pressure inlet coating thickness at the inlet distal end.

7 more elements