Closed impeller with a coated vane

Patent metadata

Field	Value
Publication number	US-9309895-B2
Application number	US-201213525562-A
Country	US
Kind code	B2
Filing date	Jun 18, 2012
Priority date	Jun 18, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

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.

First claim

What is claimed:

1. 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.

2. The closed impeller according to claim 1 wherein the maximum low pressure outlet coating thickness being about equal to the maximum low pressure inlet coating thickness, and the maximum high pressure outlet coating thickness being about equal to the maximum high pressure inlet coating thickness.

3. The closed impeller according to claim 1 wherein the maximum low pressure outlet coating thickness is equal to the maximum high pressure outlet coating thickness; and the maximum low pressure inlet coating thickness is equal to the maximum high pressure inlet coating thickness.

4. The closed impeller according to claim 1 wherein the maximum low pressure inlet coating thickness is greater than the maximum high pressure inlet coating thickness, and the maximum low pressure outlet coating thickness is greater than the maximum high pressure outlet coating thickness.

5. The closed impeller according to claim 1 wherein the maximum low pressure inlet coating thickness is less thick than the maximum high pressure inlet coating thickness, and the maximum low pressure outlet coating thickness is less thick than the maximum high pressure outlet coating thickness.

6. The closed impeller according to claim 1 wherein the minimum low pressure coating thickness ranging between about 0.15 and about 0.60 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; and the minimum high pressure coating thickness ranging between about 0.15 and about 0.60 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. The closed impeller according to claim 1 wherein the minimum low pressure coating thickness ranging between about 0.40 and about 0.55 of either one of the maximum low pressure outlet thickness at the outlet distal end or the maximum low pressure inlet thickness at the inlet distal end; and the minimum high pressure coating thickness ranging between about 0.40 and about 0.55 of either one of the maximum high pressure outlet thickness at the outlet distal end or the maximum high pressure inlet thickness at the inlet distal end.

8. The closed impeller according to claim 1 wherein the minimum low pressure coating thickness ranging between about 0.30 and about 0.40 of either one of the maximum low pressure outlet thickness at the outlet distal end or the maximum low pressure inlet thickness at the inlet distal end; and the minimum high pressure coating thickness ranging between about 0.30 and about 0.40 of either one of the maximum high pressure outlet thickness at the outlet distal end or the maximum high pressure inlet thickness at the inlet distal end.

9. The closed impeller according to claim 1 wherein the minimum low pressure coating thickness ranging between about 0.30 and about 0.60 of either one of the maximum low pressure outlet thickness at the outlet distal end or the maximum low pressure inlet thickness at the inlet distal end; and the minimum high pressure coating thickness ranging between about 0.085 and about 0.20 of either one of the maximum high pressure outlet thickness at the outlet distal end or the maximum high pressure inlet thickness at the inlet distal end.

10. The closed impeller according to claim 1 wherein the minimum low pressure coating thickness being equal to about 0.50 of either one of the maximum low pressure outlet thickness at the outlet distal end or the maximum low pressure inlet thickness at the inlet distal end; and the minimum high pressure coating thickness being equal to about 0.14 of either one of the maximum high pressure outlet thickness at the outlet distal end or the maximum high pressure inlet thickness at the inlet distal end.

11. The closed impeller according to claim 1 wherein the minimum low pressure coating thickness being equal to about 0.33 of either one of the maximum low pressure outlet thickness at the outlet distal end or the maximum low pressure inlet thickness at the inlet distal end; and the minimum high pressure coating thickness being equal to about 0.33 of either one of the maximum high pressure outlet thickness at the outlet distal end or the maximum high pressure inlet thickness at the inlet distal end.

12. The closed impeller according to claim 1 wherein the base cover further including a base exterior surface, the second cover having a second interior surface and a second exterior surface.

13. The closed impeller according to claim 1 wherein the minimum low pressure coating thickness ranges between about 35 micrometers and about 100 micrometers, and the minimum high pressure coating thickness ranges between about 35 micrometers and about 100 micrometers.

14. The closed impeller according to claim 1 wherein the maximum low pressure outlet coating thickness ranges between about 35 micrometers and about 135 micrometers, the maximum low pressure inlet coating thickness ranges between about 35 micrometers and about 135 micrometers, the maximum high pressure outlet coating thickness ranges between about 35 micrometers and about 135 micrometers, and the maximum high pressure inlet coating thickness ranges between about 35 micrometers and about 135 micrometers.

15. 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

Assignees

• Siddle Dave
• Brahmandam Sudhir
• Spitsberg Irene
• Kennametal Inc

Inventors

• Siddle Dave
• Brahmandam Sudhir
• Spitsberg Irene

Classifications

• F04D29/2222

  Construction and assembly (F04D29/2211 takes precedence) · CPC title

• F04D29/2294

  for protection, e.g. against abrasion · CPC title

• F04D29/167

  of a centrifugal flow wheel · CPC title

• F04D29/026 Primary

  especially adapted for liquid pumps · CPC title

• F05D2300/611

  Coating · CPC title