US3724969A - Turbine construction - Google Patents
Turbine construction Download PDFInfo
- Publication number
- US3724969A US3724969A US00194163A US3724969DA US3724969A US 3724969 A US3724969 A US 3724969A US 00194163 A US00194163 A US 00194163A US 3724969D A US3724969D A US 3724969DA US 3724969 A US3724969 A US 3724969A
- Authority
- US
- United States
- Prior art keywords
- casing
- turbine
- partition
- shroud
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/246—Fastening of diaphragms or stator-rings
Definitions
- the temperature of the steam entering the turbine is elevated to as high a level as possible.
- the steam passes through the turbine it flows through consecutive rows of blading, causing the blades attached to the rotor or output shaft to rotate.
- the rotation of the turbine shaft is accomplished by extracting kinetic energy from the steam, resulting in a lowering of the temperature'and pressure of the steam.
- the differences in temperature of the steam as y it passes through the turbine is,-to a large degree, a measure of its energy content. The greater the difference in temperature the higher the order of energy.
- thermal gradient refers to a temperature difference across a single structural part or group of structural parts.
- FIG. 1 is a fragmentary view partially in section of a turbine equipped with the arrangement serving as the subject of this invention.
- FIGS. 2 and 3 are diagrammatic illustrations of a connection between a shroud ring and a partition with FIG. 2 indicating the arrangementv heretofore employed and FIG. 3 illustrating the arrangement serving as the subject of this invention.
- FIG. 1 a fluid powered turbine utilizing a fluid such as steam, as a source of energy.
- the turbine V is of conventional construction to the extent that a barinvention involves a partition member connected with i the casing of the turbine which projects radially inwardly from the inner surface thereof. At its innermost radial extent the partition is provided with an axial ex- 7 rel type casing 11 is provided with an end closure 12 to form a housing for the operating parts of the turbine.
- the barrel casing l I contains an opening 14 through which steam enters the turbine and flows via annular chamber 15 to a nozzle section 17 disposed at the bottom portion of the chamber 15.
- the casing 11 has extending from its inner surface, a partition 18, one surface 19 of which forms a part of the chamber 15 subject to high temperature, high pressure steam.
- the partition 18 includes a rearwardly extending section 20 disposed in an axial direction substantially parallel to the center line of the turbine. Section 20 terminates in a flange 22 as indicated in FIG. 1, while the construction illustrated reveals the partition 18 as integral with the casing, it is obvious the partition may be formed of separate parts, if desired.
- a rotor assembly 24 including shaft 26 having a plurality of spaced rotor blades 28 mounted about the outer surface thereof.
- the rotor blades 28 are circumferentially spaced and .include sealing elements 29 disposed at their outer ends.
- Shaft 26 is supported in spaced bearings, not shown, mounted in turn in the casing and end closure of the turbine.
- Appropriate sealing assemblies, conventional with machinery of the kind described are also employed but are not shown as a detailed description of them is not deemed necessary to an understanding of this invention.
- sealing ring 30 is shown disposed adjacent the casing 11 for preventing the escape of high temperature steam outwardly along the surface of the shaft 26.
- a shroud assembly 32 is shown connected to the partition'18.
- the shroud assembly includes a shroud ring 34 having an axial section 36 projecting forwardly from a rear flange section 38.
- the shroud ring mounts a pinrality of spaced stator blades 40 which are interposed between the stages of the rotor blades 28 described above.
- Fastening means 40 connects the shroud assembly to the partition in the area wherein the flange members 22 and 38 abut one another. It will be noted that the forward surface of flange 38 engages the rearward surface of flange 22.
- the shroud ring may be formed in a single piece or in a series of segmental pieces, depending upon the number of stages and/or configuration of the blading involved. It will be observed from a consideration of FIG. I that the shroud assembly may be inserted through the open end of the barrel casing. To facilitate such I assembly the shroud ring is provided with a stepped surface configuration of the kind illustrated in FIG. 1 wherein a radial clearance extends about the outer surface of the shroud ring 36 after it is assembled to the partition.
- high temperature steam is introduced into chamber 15 and flows, via nozzle section 17, through the various stages of blading illustrated in FIG. I, to chamber 42 communicating with the outlet 16.
- the relatively high temperature steam is present in chamber 15 while the relatively low temperature steam is present in chamber 42.
- the surfaces of the parts connected by the fastening means 40 have a relatively low temperature surrounding same for the expansion of steam is substantially complete once the steam passes the rearmost stage of rotor blades 28, thus, relative distortion due to exposure to varying temperatures is maintained at a minimum. It will be obvious that the greatest temperature differential will occur across the radial portion of partition 18 where the material is of maximum thickness and thus, possesses maximum resistance to distortion.
- the clearance 43 between the outer surface of shroud ring 34 and the inner surface of the partition provides space for the collection of a small amount of high pressure gas.
- This high pressure gas inhibits leakage that may occur along adjacent edges of abutting segments when the shroud ring is formed in segments.
- FIGS. 2 and 3 To further illustrate the advantages of the construction here proposed, attention is directed to FIGS. 2 and 3.
- the prior art arrangement (FIG. 2) would involve high temperature steam at one or the lower side of the connecting fastener and low temperature steam on the other or upper side of the connecting fastener imposing a thermal gradient on the joint.
- a turbine comprising:
- a rotor assembly including a shaft having spaced regions supported in the casing, said rotor assembly including at least one row of circumferentially spaced blades arranged about the shaft so as to rotate therewith,
- a shroud assembly encircling the rotor assembly, said shroud assembly including a shroud ring, at least one row of circumferentially spaced blades extending radially inwardly from the inner surface of the shroud ring, said shroud ring being provided with a radial flange having a forward surface in engagement with the rear surface of the casing partition flange, and a forwardly rojecting portion underlying e inwardly pro ec mg portion of the partition through substantially its entire length, and
- D. means detachably securing the flange portions whereby the shroud ring is disposed with the blades thereof located axially adjacent the rotor blades.
- clearance is disposed between the shroud assembly and the casing partition; said clearance having communication with the inlet of the turbine.
Abstract
Description
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US19416371A | 1971-11-01 | 1971-11-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3724969A true US3724969A (en) | 1973-04-03 |
Family
ID=22716528
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00194163A Expired - Lifetime US3724969A (en) | 1971-11-01 | 1971-11-01 | Turbine construction |
Country Status (1)
Country | Link |
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US (1) | US3724969A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4666369A (en) * | 1985-03-21 | 1987-05-19 | General Electric Company | Apparatus for sealing joints of a steam turbine shell |
US20070297899A1 (en) * | 2006-06-22 | 2007-12-27 | Steven Sebastian Burdgick | Methods and systems for assembling a turbine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB572859A (en) * | 1942-04-03 | 1945-10-26 | Armstrong Siddeley Motors Ltd | Mounting the blades of axial-flow, rotary compressors or turbines |
US2796231A (en) * | 1954-03-24 | 1957-06-18 | Westinghouse Electric Corp | High pressure steam turbine casing structure |
-
1971
- 1971-11-01 US US00194163A patent/US3724969A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB572859A (en) * | 1942-04-03 | 1945-10-26 | Armstrong Siddeley Motors Ltd | Mounting the blades of axial-flow, rotary compressors or turbines |
US2796231A (en) * | 1954-03-24 | 1957-06-18 | Westinghouse Electric Corp | High pressure steam turbine casing structure |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4666369A (en) * | 1985-03-21 | 1987-05-19 | General Electric Company | Apparatus for sealing joints of a steam turbine shell |
US20070297899A1 (en) * | 2006-06-22 | 2007-12-27 | Steven Sebastian Burdgick | Methods and systems for assembling a turbine |
US7722314B2 (en) | 2006-06-22 | 2010-05-25 | General Electric Company | Methods and systems for assembling a turbine |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ELLIOTT TURBOMACHINERY CO., INC., A CORP OF DELAWA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED.;ASSIGNOR:CARRIER CORPORATION, A CORP OF DEL.;REEL/FRAME:004499/0922 Effective date: 19851220 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF CHICAGO, THE,ILLINOIS Free format text: LICENSE;ASSIGNOR:ELLIOT TURBOMACHINERY CO., INC.;REEL/FRAME:004940/0562 Effective date: 19871109 Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, ONE FIRST NAT Free format text: LICENSE;ASSIGNOR:ELLIOT TURBOMACHINERY CO., INC.;REEL/FRAME:004940/0562 Effective date: 19871109 |
|
AS | Assignment |
Owner name: CONTINENTAL BANK N.A. Free format text: SECURITY INTEREST;ASSIGNOR:ELLIOTT TURBOMACHINERY CO., INC.;REEL/FRAME:005258/0092 Effective date: 19891212 |