Inlet shroud assembly

Patent metadata

Field	Value
Publication number	US-9556885-B2
Application number	US-201213592830-A
Country	US
Kind code	B2
Filing date	Aug 23, 2012
Priority date	Aug 23, 2012
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

An inlet shroud assembly includes a hub and a shroud for a ram air fan. The hub includes a center bore, a first frustoconical section, a plurality of slotted cooling holes located on the first frustoconical section, a second frustoconical section, a plurality of circular cooling holes located on the second frustoconical section, a rim, a central cavity, and an annular cavity. The shroud includes a central disk with a center bore, a circular flange located on a radially outer edge of the central disk, and an outer disk with a web portion and a tip portion, the tip portion having a curved lip.

First claim

The invention claimed is:

1. A hub for a ram air fan, the hub comprising:
a central hub with a center bore;
a first frustoconical section radially outward and axially forward of the central hub;
a plurality of slotted cooling holes on the first frustoconical section;
a second frustoconical section radially outward and axially forward of the first frustoconical section;
a plurality of circular cooling holes on the second frustoconical section;
a rim radially outward and axially forward of the second frustoconical section;
a central cavity axially forward of the central hub; and
an annular cavity radially outward and axially forward of the central hub.

2. The hub of claim 1 , wherein the plurality of slotted cooling holes comprise five cooling holes equally spaced around a central axis of the hub at a radius of 0.660 inches (16.764 mm) to 0.700 inches (17.78 mm).

3. The hub of claim 1 , wherein the plurality of circular cooling holes comprises eleven cooling holes equally spaced around a central axis of the hub at a radius of 1.19 inches (30.226 mm) to 1.21 inches (30.734 mm).

4. The hub of claim 1 , wherein the slotted cooling holes each have a circumferential width between 0.633 inches (16.078 mm) and 0.713 inches (18.110 mm).

5. The hub of claim 1 , wherein the circular cooling holes each have a diameter between 0.37 inches (9.398 mm) and 0.38 inches (9.652 mm).

6. The hub of claim 1 , wherein the first frustoconical section is angled 43 degrees to 47 degrees from the central hub and the second frustoconical section is angled 68 degrees to 72 degrees from the central hub.

7. The hub of claim 1 , wherein the central cavity has a circular shape with an outer diameter of 1.5242 inches (38.715 mm) and 1.5252 inches (38.740 mm).

8. The hub of claim 1 , wherein the annular cavity has an inner diameter of 1.955 inches (49.657 mm) to 1.965 inches (49.911 mm) and an outer diameter of 2.835 inches (72.009mm) to 2.845 inches (72.263 mm).

9. A shroud for a ram air fan, the shroud comprising: a central disk with a center bore; a circular flange located on a radially outer edge of the central disk, wherein the circular flange is located at a diameter of 1.1369 inches (28.877 mm) to 1.1379 inches (28.903 mm) from a center of the central disk; and an outer disk with a web portion extending radially outward and axially rearward of the central disk and a tip portion extending radially outward of the web portion with a curved lip extending axially forward towards the central disk.

10. The shroud of claim 9 , wherein the web portion of the outer disk is angled 72 degrees to 76 degrees from the central disk and the tip portion of the outer disk curves at an angle of 83.6 degrees to 87.6 degrees from the central disk.

11. An inlet shroud assembly comprising a hub and a shroud for a ram air fan, the inlet shroud assembly comprising:
a hub, wherein the hub comprises:
a central hub with a center bore;
a first frustoconical section radially outward and axially forward of the central hub;
a plurality of slotted cooling holes on the first frustoconical section;
a second frustoconical section radially outward and axially forward of the first frustoconical section;
a plurality of circular cooling holes on the second frustoconical section;
a rim radially outward and axially forward of the second frustoconical section;
a central cavity axially forward of the central hub; and
an annular cavity radially outward and axially forward of the central hub; and

a shroud, wherein the shroud comprises:
a central disk with a center bore;
a circular flange located on a radially outer edge of the central disk; and
an outer disk with a web portion extending radially outward and axially rearward of the central disk and a tip portion extending radially outward of the web portion with a curved lip extending axially forward towards the central disk.

12. The inlet shroud assembly of claim 11 , wherein the plurality of slotted cooling holes comprise five cooling holes equally spaced around a central axis of the hub at a radius of 0.660 inches (16.764 mm) to 0.700 inches (17.78 mm).

13. The inlet shroud assembly of claim 11 , wherein the plurality of circular cooling holes comprises eleven cooling holes equally spaced around a central axis of the hub at a radius of 1.19 inches (30.226 mm) to 1.21 inches (30.734 mm).

14. The inlet shroud assembly of claim 11 , wherein the slotted cooling holes each have a circumferential width between 0.633 inches (16.078 mm) and 0.713 inches (18.110 mm).

15. The inlet shroud assembly of claim 11 , wherein the circular cooling holes each have a diameter between 0.370 inches (9.398 mm) and 0.38 inches (9.652 mm).

16. The inlet shroud assembly of claim 11 , wherein the first frustoconical section is angled 43 degrees to 47 degrees from the central hub and the second frustoconical section is angled 68 degrees to 72 degrees from the central hub.

17. The inlet shroud assembly of claim 11 , wherein the web portion of the outer disk is angled 72 degrees to 76 degrees from the central disk and the tip portion of the outer disk curves at an angle of 83.6 degrees to 87.6 degrees from the central disk.

18. The inlet shroud assembly of claim 11 , wherein the circular flange is located at a diameter of 1.1369 inches (28.877 mm) to 1.1379 inches (28.903 mm) from a center axis.

19. The inlet shroud assembly of claim 11 , wherein the hub and shroud are press fit together and attached with a tie rod.

Assignees

• Beers Craig M
• Colson Darryl A
• Richardson Victoria S
• Hamilton Sundstrand Corp

Inventors

• Beers Craig M
• Colson Darryl A
• Richardson Victoria S

Classifications

• F04D25/06

  the pump being electrically driven (F04D25/08 takes precedence) · CPC title

• F04D19/00

  Axial-flow pumps (F04D21/00 takes precedence; {pump comprising axial flow and radial flow stages F04D17/025}) · CPC title

• F04D29/5806

  Cooling the drive system · CPC title

• F04D29/329

  Details of the hub · CPC title

• F04D29/057

  hydrostatic; hydrodynamic · CPC title