Dirt removal means for air cooled blades

• US 4,820,123 A
• Filed: 04/25/1988
• Issued: 04/11/1989
• Est. Priority Date: 04/25/1988
• Status: Expired due to Term

• Current Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Hall, Kenneth B.
• Primary Examiner(s): Powell, Jr., Everette A.
• Application Number:
  US07/185,226
• Time in Patent Office: 351 Days
• Field of Search: 416/92, 416/97 R, 416/96 R, 416/97 A
• US Class Current: 416/97.00R
• CPC Class Codes: F01D 25/32 Collecting of condensation water; Drainage ; Removing solid particles
• CPC Class Codes: F01D 5/081 Cooling fluid being directed on the side of the rotor disc or at the roots of the blades F01D5/087 takes precedence
• CPC Class Codes: F01D 5/187 Convection cooling
• CPC Class Codes: F01D 5/3007 of axial insertion type
• CPC Class Codes: F05D 2260/607 Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A dirt removal means for air cooled blades for removing dirt at the blade of a gas turbine engine. The means is a stamped out sheet metal that defines a deflector or plurality of deflectors adapted to overlie the inlets of the blade'"'"'s internal cooling passages for diverting the dirt entrained air through a high velocity air stream and discharging the dirt entrained air while allowing the cleaner portion of air to turn the corner of the deflector and flow through the blades cooling passages. These means can be applied to existing blades.

Claims

1. An internally cooled turbine blade supported in a turbine disk for a gas turbine engine, said blade having a root section mounted in a recess formed in said disk and a tip section, wall means between said root section and tip section defining an airfoil of said blade, means including an inlet internally in said blade for routing cooling air through said inlet into said airfoil and discharging through openings in said wall into the gas path of said gas turbine engine, means for preventing dirt from clogging said openings, said means including a sheet metal generally rectangularly shaped and having a portion stamped out so as to have a depending deflector portion extending angularly therefrom, means for securing said sheet metal to the root section of said blade so that said deflector portion is angularly disposed relative to said inlet and being in overlying relationship, means for admitting cooling air in said recess between said root section and said disk and an opening in said disk for discharging a portion of said air out of said disk and bypassing said inlet, whereby said deflector deflects the dirt entrained airstream into the discharging air while permitting the relatively dirt-free entrained air to enter said inlet by turning around the angle formed by said deflector.

2. An internally cooled turbine blade as in claim 1, including a plurality of internal passages in said turbine blade and a plurality of inlets associated with each internal passage, a complementary deflector stamped out of said sheet metal aligned to be angularly disposed relative to each of said plurality of inlets, and overlying said inlets to deflect said dirt entrained air into said discharging portion of said cooling airstream.

3. Means for removing dirt from an internally cooled blade for a gas turbine engine, said blade having a root section, a tip section and wall means between said tip section and root section defining an airfoil, a plurality of spanwise disposed ribs internally of said blade defining serpentine passages for conducting cool air through the blade and discharging into the engine'"'"'s gas path through openings in said wall means, at least one straight through passage internally of said blade for conducting cooling air from the root section to the tip section and discharging into the gas path through an opening formed in said tip section, the opening being sized to discharge the largest dirt particle into the gas path, a sheet metal member having deflectors stamped therein to extend angularly relative to the opening remained in the sheet metal, means for attaching said sheet metal to the root section of said blade and orienting said deflectors to overlie the inlet of said serpentine passages, and direct the dirt entrained air into said straight through passages.

4. Means for removing dirt as claimed in claim 3, wherein said blade is a turbine blade.