Gas turbine with exhaust gas casing and exhaust gas duct

{
  "publication_number": "US5346365A",
  "country": "US",
  "kind": "A",
  "title": "Gas turbine with exhaust gas casing and exhaust gas duct",
  "abstract": "In a gas turbine, the exhaust gas casing (5) consists of a ring-shaped hub-end inner part (6) and a ring-shaped outer part (7), which parts bound a diffuser (9) and are provided with a horizontal split plane. The exhaust gas casing merges into an exhaust gas duct, whose boundary walls likewise consist of a ring-shaped hub-end inner part (16) and a ring-shaped outer part (17). The split locations between the exhaust gas casing and the exhaust gas duct are configured as flange connections (7A, 17A and 6A, 16A respectively). The flanges (7A, 17A and 6A and 16A respectively) at the split locations have a conically extending contact surface.",
  "claims": [
    "1. An axial flow turbomachine in which outlet rotor blades are followed downstream by at least an exhaust gas casing, comprising: the exhaust gas casing having boundary walls that consist of a ring-shaped hub-end inner part and a ring-shaped outer part which bound a diffuser, the inner part and the outer part each comprising two half shells separable at a horizontal split plane; the exhaust gas casing emerging into an exhaust gas duct, the exhaust gas duct having boundary walls that consist of a ring-shaped hub-end inner part and a ring-shaped outer part; and, flanges on the exhaust gas casing and the exhaust gas duct Connecting the respective inner parts and outer pans, wherein the flanges connecting the inner parts and the flanges connecting the outer parts located in different vertical planes, and wherein the flanges have conically extending contact surfaces,"
  ],
  "description_excerpt": "Field of the Invention The invention relates to an axial flow turbomachine, in particular a gas turbine, in which the outlet rotor blades are followed downstream by an exhaust gas casing, whose boundary walls consist essentially of a ring-shaped hub-end inner part and a ring-shaped outer part which bound a diffuser and are provided with a horizontal split plane, and in which the exhaust gas casing merges into an exhaust gas duct, whose boundary walls likewise consist essentially of a ring-shaped hub-end inner part and a ring-shaped outer part, and in which the split locations between the exhaust gas casing and the exhaust gas duct are configured as a flange connection. Discussion of Background In stationary gas turbine installations, relatively long outlet diffusers, preferably extending in the axial direction, are provided for aerodynamic reasons and for improved influence on the efficiency- For this purpose, it is necessary to arrange the exhaust gas end bearing of the turbine rotor in the diffuser construction itself.\n\nDuring transient operation, as occurs frequently in power station gas turbines used for peak load cover, for example, thermal stresses and differential expansions occur on the casings. These lead to changes in the clearance between the casing and the rotor and can also affect the shaft bearing arrangement. Blade damage and damage to the bearings and stuffing boxes can then occur. These disadvantages become particularly effective to an increased extent in the case of present-day modern machines with large dimensions and high temperatures.",
  "cpc": [
    "F01D 25/243",
    "F05D 2230/64",
    "F05D 2230/642",
    "F16B 2200/503",
    "F16B 2200/506"
  ],
  "ipc": [
    "F01D 25/24",
    "F01D 25/30",
    "F02C 7/00",
    "H04N 5/445"
  ],
  "assignees": [
    "ASEA BROWN BOVERI"
  ],
  "inventors": [
    "MATYSCAK KAMIL"
  ],
  "filing_date": "1993-09-01",
  "publication_date": "1994-09-13",
  "grant_date": "1994-09-13",
  "priority_date": "1992-09-25",
  "application_number": "US-11418193-A",
  "family_id": "6468783",
  "citations": [
    "DE2619929A1",
    "EP0417433A1",
    "EP0491966A1",
    "US2803429A",
    "US4076452A",
    "US5102298A",
    "US869106A"
  ]
}