Turbine housing for air cycle machine

Patent metadata

Field	Value
Publication number	US-9976447-B2
Application number	US-201213559976-A
Country	US
Kind code	B2
Filing date	Jul 27, 2012
Priority date	Jul 27, 2012
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A turbine inlet housing has a main housing body extending about a central axis. An inlet duct delivers air into a cavity within the main housing body. Bolt hole bosses are formed on a downstream face of the inlet housing to receive bolts to secure an outlet housing to the inlet housing. A plurality of the bosses have a ramped surface which extends radially outwardly for a greater extent than a second plurality of bosses. The plurality of ramped bosses extend between the downstream face and the duct. The ramped bosses have a forward boss portion, and a ramped surface at an angle of between 50 and 54 degrees extending from an upstream end of the forward boss portion. A curved surface curves from an upstream end of the ramped surface to merge into the duct. A turbine stage and air cycle machine are also disclosed and claimed.

First claim

What is claimed is:

1. A turbine inlet housing for an air cycle machine comprising:
a main housing body extending about a central axis, and for receiving a turbine rotor, and an inlet duct extending away from said main housing body for delivering air into a cavity within said main housing body
a downstream face of said main housing body for facing an outlet housing, and said duct being upstream of said downstream face;
a plurality of bolt hole bosses formed on said downstream face of said main housing body, said bolt hole bosses for receiving bolts to secure the outlet housing to said turbine inlet housing, and a first plurality of said plurality of said bosses having a ramped surface extending radially outwardly for a greater extent than a second plurality of said plurality of said bosses, and said first plurality of ramped bosses extending between said downstream face and said duct, and said ramped bosses having a forward boss portion, and a ramped surface at an angle of between 50 and 54 degrees extending from an upstream end of said forward boss portion, and a curved surface curving from an upstream end of said ramped surface to merge into said duct;
a ratio of a distance to the upstream end of said ramped surface being measured perpendicularly from said central axis to a diameter of a bolt hole formed in said ramped boss is between 4.2 and 4.4;
a ratio of a diameter of said duct to a thickness of a wall in said main housing body being between 39.3 and 39.8; and
wherein a ratio of the distance to the upstream end of said ramped surface measured perpendicularly from said center axis to said thickness of said wall in said main housing body is between 8.8 and 9.3.

2. An air cycle machine comprising:
a first stage turbine rotor, a second stage turbine rotor, and a compressor rotor, said first and second stage turbine rotors being secured to drive a shaft, and said compressor rotor being secured to rotate with said shaft, and said compressor rotor being axially intermediate said first and second stage turbine rotors;
said first stage turbine rotor having a first stage housing, said compressor rotor having a compressor housing, said second stage turbine rotor having a second stage housing, with said second stage turbine rotor including an outlet housing which is bolted to an inlet housing; and
said inlet housing having a main housing body extending about a central axis, and for receiving a turbine rotor, and an inlet duct extending away from said main housing body for delivering air into a cavity within said main housing body;
a downstream face of said main housing body facing said outlet housing, and said duct being upstream of said downstream face;
a plurality of bolt hole bosses formed on said downstream face of said main housing body, said bolt hole bosses receiving bolts to secure said outlet housing to said turbine inlet housing, and a first plurality of said plurality of said bosses having a ramped surface extending radially outwardly for a greater extent than a second plurality of said plurality of said bosses, and said first plurality of ramped bosses extending between said downstream face and said duct, and said ramped bosses having a forward boss portion, and a ramped surface at an angle of between 50 and 54 degrees extending from an upstream end of said forward boss portion, and a curved surface curving from an upstream end of said ramped surface to merge into said duct;
a ratio of a distance to the upstream end of said ramped surface being measured perpendicularly from said central axis to a diameter of a bolt hole formed in said ramped boss is between 4.2 and 4.4;
a ratio of a diameter of said duct to a thickness of a wall in said main housing body being between 39.3 and 39.8; and
wherein a ratio of the distance to the upstream end of said ramped surface measured perpendicularly from said center axis to said thickness of said wall in said main housing body is between 8.8 and 9.3.

3. A second stage turbine for use in an air cycle machine comprising:
a turbine rotor received between an outlet housing and an inlet housing, said outlet housing and said inlet housing being connected by bolts;
said inlet housing having a main housing body extending about a central axis, and for receiving a turbine rotor, and an inlet duct extending away from said main housing body for delivering air into a cavity within said main housing body;
a downstream face of said main housing body for facing an outlet housing, and said duct being upstream of said downstream face;
a plurality of bolt hole bosses formed on said downstream face of said main housing body, said bolt hole bosses for receiving bolts to secure outlet housing to said turbine inlet housing, and a first plurality of said plurality of said bosses having a ramped surface extending radially outwardly for a greater extent than a second plurality of said plurality of said bosses, and said first plurality of ramped bosses extending between said downstream face and said duct, and said ramped bosses having a forward boss portion, and a ramped surface at an angle of between 50 and 54 degrees extending from an upstream end of said forward boss portion, and a curved surface curving from an upstream end of said ramped surface to merge into said duct;
a ratio of a distance to the upstream end of said ramped surface being measured perpendicularly from said central axis to a diameter of a bolt hole formed in said ramped boss is between 4.2 and 4.4;
a ratio of a diameter of said duct to a thickness of a wall in said main housing body being between 39.3 and 39.8; and
wherein a ratio of the distance to the upstream end of said ramped surface measured perpendicularly from said center axis to said thickness of said wall in said main housing body is between 8.8 and 9.3.

Assignees

• Chrabascz Eric
• Merritt Brent J
• Hamilton Sundstrand Corp

Inventors

• Chrabascz Eric
• Merritt Brent J

Classifications

• F05D2220/10

  in ram-jet engines or ram-jet driven vehicles · CPC title

• F01D25/285 Primary

  Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F05D2230/72

  Maintenance · CPC title