TURBINE CASING

• US 3,614,259 A
• Filed: 09/04/1969
• Issued: 10/19/1971
• Est. Priority Date: 09/04/1969
• Status: Expired due to Term

• Current Assignee: Joseph J. Neff
• Original Assignee: Joseph J. Neff
• Inventors: Neff, Joseph J.
• Primary Examiner(s): Raduazo, Henry F.
• Application Number:
  US04/855,270
• Time in Patent Office: 775 Days
• Field of Search: 60/13 415/205,219,203,204,206
• US Class Current: 415/205
• CPC Class Codes: F01D 17/146 by throttling the volute inlet of radial machines or engines
• CPC Class Codes: F01D 9/026 Scrolls for radial machines or engines
• CPC Class Codes: F02B 37/025 Multiple scrolls or multiple gas passages guiding the gas to the pump drive
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A divided turbine casing for a gas turbine is disclosed, which may be used to provide either a pulse turbine or a variable speed turbine. When used as a pulse turbine, two separate flows of pulsating gas are supplied to the divided inlet portion of the casing. The pulses in the respective flows are transmitted by the casing to the turbine wheel with minimum energy loss. When used as a variable speed turbine, a valve is provided in the inlet portion of the casing to direct gas supplied to the inlet portion into one or the other or both parts of the divided inlet to provide different ranges of gas velocity at the turbine wheel and consequently different ranges of turbine speed.

Claims

1. A turbine casing adapted for a turbine wheel having a plurality of circumferentially spaced blades, said casing comprising a volute portion adapted to surround said wheel and having a radially extending vaneless annular throat open throughout its length and adapted to communicate with the spaces between said blades, and an annular partition extending generally radially throughout said volute portion and dividing the latter into two parts, said partition having a radially inner edge positioned substantially at the outer periphery of said throat, whereby a flow of gas from one or the other or both of the parts of said volute portion fills said throat before entering the spaces between said blades for driving said wheel.

2. The turbine casing of claim 1, in which said partition is conical and the radially inner edge of said partition is beveled on the inner side of the cone.

3. The turbine casing of claim 1, in which the cross-sectional area of one of the parts of said volute portion is greater than the cross-sectional area of the other of said parts, and the radius from the axis of the casing to the center of the cross-sectional area of said one part is greater than the radius from the axis of the casing to the center of the cross-sectional area of the other part of said volute portion such that the ratio of the cross-sectional area to the radius of said one part at the upstream end thereof is substantially equal to the ratio of the cross-sectional area to the radius of said other part at the upstream end thereof.

4. The turbine casing of claim 1, including an inlet portion extending generally tangentially to said volute portion, and said partition extending not only throughout said volute portion but also into said inlet portion and dividing the latter into two parts.