[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

US2812156A - Gas turbine having means for cooling the stator - Google Patents

Gas turbine having means for cooling the stator Download PDF

Info

Publication number
US2812156A
US2812156A US222979A US22297951A US2812156A US 2812156 A US2812156 A US 2812156A US 222979 A US222979 A US 222979A US 22297951 A US22297951 A US 22297951A US 2812156 A US2812156 A US 2812156A
Authority
US
United States
Prior art keywords
stator
blades
cooling medium
wall
annular chamber
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
Application number
US222979A
Inventor
Ledinegg Max
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Simmering Graz Pauker AG
Original Assignee
Simmering Graz Pauker AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Simmering Graz Pauker AG filed Critical Simmering Graz Pauker AG
Application granted granted Critical
Publication of US2812156A publication Critical patent/US2812156A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/12—Cooling

Definitions

  • This invention relates to a gas turbine having means for cooling the stator and the inlet guide of the turbine.
  • air, gas or liquids may be used as a cooling medium.
  • the cooling medium first flows in an axial direction through the rotor, the heat absorbed by the blades being transferred to the cooling medium. Subsequently the cooling medium flows along the stator to conduct away the waste gases, and thereafter approaches the stator blades, through which it flows in parallel paths.
  • the stator blades are hollow and each contain a tube, e. g., in their interior. For instance, the stator blades may be traversed by the cooling medium from the outside to the inside and the cooling medium may be conducted away through the tubes located in the blades. Subsequently the cooling medium enters an annular space, whence it is conducted away.
  • stator blades are pressed from the outside into correspondingly shaped holes in the casing.
  • the pressure difference prevailing between the cooling medium side and the combustion gas side assists in providing a seal.
  • Fig. 1 is a longitudinal partly sectional view of the turbine.
  • Figs. 2 and 3 are fragmentary partly sectional views at right angles to each other, showing on a larger scale the construction of the stator blades.
  • Figs. 4 and 5 are sectional views taken through the blades along the lines 4-4 and 5-5, respectively, of Fig. 2.
  • Fig. 1, 1 is the rotor turnably supported, for rotation about a common axis, in a stator 30, the rotor being axially traversed by a cooling medium through a passage 31 formed in said rotor and extending therethrough so that the coolers 3 of the rotor blades 4 can deliver their heat to the cooling medium.
  • the cooling medium emerges from the rotor passage into the passage portion or space 7 between the casing or inner wall 14 and the shell or outer wall 6 surrounding the waste gas conducting portion of the casing 14 of a stator generally designated 30, and finally enters the inner annular chamber portion 8 said space 7 constituting an annular chamber in said stator. From this chamber portion the cooling medium flows at 9 into the hollow stator blades 10 (Fig. 2).
  • the means for guiding the cooling medium from said rotor passage to finally reach the outer annular chamber portion is generally designated guide means.
  • the exhaust branch of casing 14 of the turbine is provided on its inside with a lining 15 of a material of poor thermal conductivity.
  • This lining may also consist of sheet metal, which is fixed to 14 with a small spacing 2,812,156 Patented Nov. 5, 1957 between them. In this manner 14 is cooled so that appreciable differential expansion as compared with the rotor is prevented and smallest distances of play can be maintained.
  • the blades 1% of the stator are inserted from the outside into openings of the stator which have a corresponding slight taper. This can be seen from Figs. 2 and 3.
  • the first step consists in mounting the blades 10 by pressing them into the annular cones 16. Now the inner tubes or tubular means 21 may be inserted, spacing wings 24 facilitating the guidance and small feet 25 providing a proper spacing from the bottom. It is seen that each tube 21 has opposite open ends, is spaced inwardly from the side wall of blade 10, extends through the outer open end thereof, and is spaced'by feet 25 in part from the closed end of blade 10 which is adjacent the rotor.
  • the intermediate wall 17 is mounted and thereafter the nipples 18 are fitted, which conduct the cooling medium through the conical connecting piece 19 to 11.
  • the outer wall 20 is fitted last.
  • the section taken along the line 4-4 of Fig. 2 shows in Fig. 4 the nipple 18 and, in an elevation, the blade cone 16.
  • the cone and the blade may be welded to each other at 22 (Fig. 2).
  • the cone may also be secured to the stator by tightly welding it at 23 around its periphery.
  • the sectional view taken along the line 5-'5 of Fig. 2 shows in Fig. 5 the blade 10 and the tubular means or discharge pipe 21 guided in said blade.
  • the space 7 provides a free annular space communicating with the interior of all of the hollow stator blades 10 as well as with the rotor passage, while the wall 17 forms with Wall 20 the chamber 12 which is entirely separated by wall 17 from the free annular space 7.
  • the inner wall of the stator, to which the cones 16 are fixed, and the outer -wall 20 define between themselves an annular chamber divided by the intermediate wall portion 17, which is fixed at its side edges to the outer wall 20, into an inner chamber 8 and an outer chamber portion 12.
  • the several tubular elements 18 and 21 provide a tubular means causing the cooling medium to flow downwardly into blades 10 and from the latter through the tubular means into the outer chamber portion 12.
  • the invention described enables the cooling of the inlet guide without losses because this air may be utilized as air for combustion.
  • the heat carried oif by the cooling means is utilized in the process.
  • the cooling of the stator blades also cools the stator so that the stator and the rotor can be constructed with smallest distances of play.
  • a turbine comprising, in combination, a rotor formed with a passage extending therethrough and having a central turning axis, said rotor passage being adapted to have a cooling medium flowing therethrough; a stator coaxial with and surrounding said rotor, turnably supporting the same for rotation about said axis, and having a plurality of hollow stator blades mounted thereon, said blades each including an elongated tubular wall having a closed inner end adjacent said rotor and an open outer end distant from said rotor; and guide means forming part of the stator, communicating with one end of said rotor passage to receive a cooling medium therefrom and communicating with the interior of said hollow stator blades so as to cool the latter with the same cooling medium which fiows through said rotor passage, said guide means comprising a passage portion having an inner annular chamber portion communicating with the interior of all of said hollow stator blades and communicating with said rotor passage to receive the cooling medium therefrom, an outer annular chamber portion entirely separated from said inner annular chamber portion by an
  • a stator having an inner wall located around a predetermined axis and an outer wall spaced from said inner wall to form an annular chamber in said stator; an intermediate wall portion fixed to said stator and being located between said inner and outer walls to form an inner annular chamber portion with said inner stator wall and, with said outer stator wall, an outer annular chamber ,portion separate from said inner chamber portion; a plurality of'hollow stator blades fixed to said inner stator wall, having tubular side walls extending therefrom toward said axis, having inner closed ends directed toward said axis, and having opposite free open ends communicating with said inner annular chamber portion; and a plurality of tubular means fixed to said intermediate wall portion and respectively extending into said hollow stator blades and being spaced inwardly from said side walls thereof and at least in part from said closed ends thereof, each of said tubular means having opposite open ends which respectively communicate with the interior of the respective stat-or blade and with said outer annular chamber portion; extending from said intermediate wall portion into the interior
  • a stator having an inner wall located around a predetermined axis and an outer wall spaced from said inner wall to form an annular chamber in said stator; an intermediate wall portion fixed along opposite side edges thereof to said outer wall of said statorand being located at all parts except said side edges thereof between and in spaced relation to said inner and outer walls to form an inner annular chamber portion with said inner stator wall and, with said outer stator wall, an outer annular chamber portion separate from said first chamber portion; a plurality of hollow stator blades fixed to said inner stator wall,
  • tubular side walls extending therefrom toward said axis, having inner closed ends directed toward said axis, and having opposite free open ends communicating with said inner annular chamber portion; and a plurality of tubular means fixed to said intermediate wall portion and respectively extending into said hollow stator blades and being spaced inwardly from said side walls thereof and at least in part from said closed ends thereof, each of said tubular means having opposite open ends which respectively communicate with the interior of the respective stator blade and with said outer annular chamber portion; extending from said intermediate wall portion into the interior of said hollow blades, so that a cooling medium in said inner annular chamber portion flows in parallel into all of said stator blades along the spaces between said plurality of tubular means and said stator blades and through said plurality of tubular means into said outer annular chamber portion.
  • a turbine comprising, in combination, a rotor formed with a passage extending therethrough and having a central turning axis, said rotor passage being adapted to have a cooling medium flowing therethrough; a stator coaxial with and surrounding said rotor turnably supporting the same for rotation about said axis and having a plurality of hollow stator blades mounted thereon, said blades each including an elongated tubular wall having a closed inner end adjacent said rotor and an open outer end distant from said rotor; and guide means forming part of the stator communicating with one end of said rotor passage to receive a cooling medium therefrom and communicating with the interior of said hollow stator blades so as to cool the latter with the same cooling medium which flows through said rotor passage, said guide means comprising a passage portion having an inner annular chamber portion communicating with the interior of all of said hollow stator blades and communicating with said rotor passage to receive the cooling medium therefrom; an outer annular chamber portion entirely separated from said inner annular chamber portion by an intermediate annular wall portion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Description

Nov. 5, 1957 M. LEDINEGG 7 GAS TURBINE HAVING MEANS FOR COOLING THE STATOR Filed April 26, 1951 m1 Fig.2
Uite Sttes Patent GAS TURBINE HAVING MEANS non run srAroR Application April 26, 1951, Serial No. 222,979 Claims priority, application Austria May 2, 1950 4 Claims. (Cl. 25339.1)
COOLING This invention relates to a gas turbine having means for cooling the stator and the inlet guide of the turbine. In the invented structure, air, gas or liquids may be used as a cooling medium. According to the invention the cooling medium first flows in an axial direction through the rotor, the heat absorbed by the blades being transferred to the cooling medium. Subsequently the cooling medium flows along the stator to conduct away the waste gases, and thereafter approaches the stator blades, through which it flows in parallel paths. The stator blades are hollow and each contain a tube, e. g., in their interior. For instance, the stator blades may be traversed by the cooling medium from the outside to the inside and the cooling medium may be conducted away through the tubes located in the blades. Subsequently the cooling medium enters an annular space, whence it is conducted away.
According to the invention the stator blades are pressed from the outside into correspondingly shaped holes in the casing. The pressure difference prevailing between the cooling medium side and the combustion gas side assists in providing a seal.
The structure according to the invention is shown by way of example in Figs. 1 to of the accompanying drawings.
Fig. 1 is a longitudinal partly sectional view of the turbine.
Figs. 2 and 3 are fragmentary partly sectional views at right angles to each other, showing on a larger scale the construction of the stator blades.
Figs. 4 and 5 are sectional views taken through the blades along the lines 4-4 and 5-5, respectively, of Fig. 2.
In Fig. 1, 1 is the rotor turnably supported, for rotation about a common axis, in a stator 30, the rotor being axially traversed by a cooling medium through a passage 31 formed in said rotor and extending therethrough so that the coolers 3 of the rotor blades 4 can deliver their heat to the cooling medium. At 5 the cooling medium emerges from the rotor passage into the passage portion or space 7 between the casing or inner wall 14 and the shell or outer wall 6 surrounding the waste gas conducting portion of the casing 14 of a stator generally designated 30, and finally enters the inner annular chamber portion 8 said space 7 constituting an annular chamber in said stator. From this chamber portion the cooling medium flows at 9 into the hollow stator blades 10 (Fig. 2). At 11 the cooling medium emerges out of the stator blade and enters the outer annular chamber portion 12, out of which the cooling medium is conducted away through the branch 13. The means for guiding the cooling medium from said rotor passage to finally reach the outer annular chamber portion is generally designated guide means. The exhaust branch of casing 14 of the turbine is provided on its inside with a lining 15 of a material of poor thermal conductivity. This lining may also consist of sheet metal, which is fixed to 14 with a small spacing 2,812,156 Patented Nov. 5, 1957 between them. In this manner 14 is cooled so that appreciable differential expansion as compared with the rotor is prevented and smallest distances of play can be maintained.
The blades 1% of the stator are inserted from the outside into openings of the stator which have a corresponding slight taper. This can be seen from Figs. 2 and 3. The first step consists in mounting the blades 10 by pressing them into the annular cones 16. Now the inner tubes or tubular means 21 may be inserted, spacing wings 24 facilitating the guidance and small feet 25 providing a proper spacing from the bottom. It is seen that each tube 21 has opposite open ends, is spaced inwardly from the side wall of blade 10, extends through the outer open end thereof, and is spaced'by feet 25 in part from the closed end of blade 10 which is adjacent the rotor. Subsequently the intermediate wall 17 is mounted and thereafter the nipples 18 are fitted, which conduct the cooling medium through the conical connecting piece 19 to 11. The outer wall 20 is fitted last. The section taken along the line 4-4 of Fig. 2 shows in Fig. 4 the nipple 18 and, in an elevation, the blade cone 16. For instance, the cone and the blade may be welded to each other at 22 (Fig. 2). According to the invention the cone may also be secured to the stator by tightly welding it at 23 around its periphery. The sectional view taken along the line 5-'5 of Fig. 2 shows in Fig. 5 the blade 10 and the tubular means or discharge pipe 21 guided in said blade.
It will be seen from the above description that the space 7 provides a free annular space communicating with the interior of all of the hollow stator blades 10 as well as with the rotor passage, while the wall 17 forms with Wall 20 the chamber 12 which is entirely separated by wall 17 from the free annular space 7. The inner wall of the stator, to which the cones 16 are fixed, and the outer -wall 20 define between themselves an annular chamber divided by the intermediate wall portion 17, which is fixed at its side edges to the outer wall 20, into an inner chamber 8 and an outer chamber portion 12. The several tubular elements 18 and 21 provide a tubular means causing the cooling medium to flow downwardly into blades 10 and from the latter through the tubular means into the outer chamber portion 12.
If air is used as a cooling medium, the invention described enables the cooling of the inlet guide without losses because this air may be utilized as air for combustion. Thus the heat carried oif by the cooling means is utilized in the process. By the installation of the guide blade as described, an arrangement ensuring'safe operation is achieved. At the same time the cooling of the stator blades also cools the stator so that the stator and the rotor can be constructed with smallest distances of play.
What I claim is:
1. A turbine comprising, in combination, a rotor formed with a passage extending therethrough and having a central turning axis, said rotor passage being adapted to have a cooling medium flowing therethrough; a stator coaxial with and surrounding said rotor, turnably supporting the same for rotation about said axis, and having a plurality of hollow stator blades mounted thereon, said blades each including an elongated tubular wall having a closed inner end adjacent said rotor and an open outer end distant from said rotor; and guide means forming part of the stator, communicating with one end of said rotor passage to receive a cooling medium therefrom and communicating with the interior of said hollow stator blades so as to cool the latter with the same cooling medium which fiows through said rotor passage, said guide means comprising a passage portion having an inner annular chamber portion communicating with the interior of all of said hollow stator blades and communicating with said rotor passage to receive the cooling medium therefrom, an outer annular chamber portion entirely separated from said inner annular chamber portion by an intermediate annular wall portion defining the outer limit of said inner annular chamber portion and being located around a part of said passage portion, and a plurality of tubular means extending from said intermediate wall portion into the interior of said hollow blades, respectively, through said open ends thereof, and being spaced inwardly from the side walls of said blades and at least in part from said closed ends of said blades, said plurality of tubular means each having opposite open ends so that said cooling medium flows in parallel from said free annular space along the outside of said tubular means into said hollow stator blades and through said plurality of tubular means into said outer annular chamber.
2. In a turbine, in combination, a stator having an inner wall located around a predetermined axis and an outer wall spaced from said inner wall to form an annular chamber in said stator; an intermediate wall portion fixed to said stator and being located between said inner and outer walls to form an inner annular chamber portion with said inner stator wall and, with said outer stator wall, an outer annular chamber ,portion separate from said inner chamber portion; a plurality of'hollow stator blades fixed to said inner stator wall, having tubular side walls extending therefrom toward said axis, having inner closed ends directed toward said axis, and having opposite free open ends communicating with said inner annular chamber portion; and a plurality of tubular means fixed to said intermediate wall portion and respectively extending into said hollow stator blades and being spaced inwardly from said side walls thereof and at least in part from said closed ends thereof, each of said tubular means having opposite open ends which respectively communicate with the interior of the respective stat-or blade and with said outer annular chamber portion; extending from said intermediate wall portion into the interior of said hollow blades, so that a cooling medium in said inner annular chamber portion flows in parallel into all of said stator blades along the spaces between said plurality of tubular means and said stator blades and through said plurality of tubular means into said outer annular chamber portion.
3. In a turbine, in combination, a stator having an inner wall located around a predetermined axis and an outer wall spaced from said inner wall to form an annular chamber in said stator; an intermediate wall portion fixed along opposite side edges thereof to said outer wall of said statorand being located at all parts except said side edges thereof between and in spaced relation to said inner and outer walls to form an inner annular chamber portion with said inner stator wall and, with said outer stator wall, an outer annular chamber portion separate from said first chamber portion; a plurality of hollow stator blades fixed to said inner stator wall,
4 having tubular side walls extending therefrom toward said axis, having inner closed ends directed toward said axis, and having opposite free open ends communicating with said inner annular chamber portion; and a plurality of tubular means fixed to said intermediate wall portion and respectively extending into said hollow stator blades and being spaced inwardly from said side walls thereof and at least in part from said closed ends thereof, each of said tubular means having opposite open ends which respectively communicate with the interior of the respective stator blade and with said outer annular chamber portion; extending from said intermediate wall portion into the interior of said hollow blades, so that a cooling medium in said inner annular chamber portion flows in parallel into all of said stator blades along the spaces between said plurality of tubular means and said stator blades and through said plurality of tubular means into said outer annular chamber portion.
4. A turbine comprising, in combination, a rotor formed with a passage extending therethrough and having a central turning axis, said rotor passage being adapted to have a cooling medium flowing therethrough; a stator coaxial with and surrounding said rotor turnably supporting the same for rotation about said axis and having a plurality of hollow stator blades mounted thereon, said blades each including an elongated tubular wall having a closed inner end adjacent said rotor and an open outer end distant from said rotor; and guide means forming part of the stator communicating with one end of said rotor passage to receive a cooling medium therefrom and communicating with the interior of said hollow stator blades so as to cool the latter with the same cooling medium which flows through said rotor passage, said guide means comprising a passage portion having an inner annular chamber portion communicating with the interior of all of said hollow stator blades and communicating with said rotor passage to receive the cooling medium therefrom; an outer annular chamber portion entirely separated from said inner annular chamber portion by an intermediate annular wall portion defining the outer limits of said inner annular chamber portion and being located around a part of said passage portion; and means for conducting said cooling medium from said inner annular chamber portion through said hollow stator blades to said outer annular chamber portion.
References Cited in the file of this patent UNITED STATES PATENTS 2,154,481 Vorkauf Apr. 18, 1939 2,540,456 Price Feb. 6, 1951 2,563,269 Price Aug. 7, 1951 FOREIGN PATENTS 346,599 Germany u Jan. 5, 1922 420,781 Germany Oct. 31, 1925 824,013 France Oct. 25, 1937 897,034 France Mar. I5, 1944
US222979A 1950-05-02 1951-04-26 Gas turbine having means for cooling the stator Expired - Lifetime US2812156A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT294841X 1950-05-02

Publications (1)

Publication Number Publication Date
US2812156A true US2812156A (en) 1957-11-05

Family

ID=3671021

Family Applications (1)

Application Number Title Priority Date Filing Date
US222979A Expired - Lifetime US2812156A (en) 1950-05-02 1951-04-26 Gas turbine having means for cooling the stator

Country Status (4)

Country Link
US (1) US2812156A (en)
CH (1) CH294841A (en)
DE (1) DE881425C (en)
GB (1) GB696558A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0534207A1 (en) * 1991-09-27 1993-03-31 Westinghouse Electric Corporation Gas turbine vane cooling air insert

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1080352B (en) * 1957-10-21 1960-04-21 Bmw Triebwerkbau Ges M B H Cooling device for gas turbines, especially for gas turbines operated with heavy oil
GB920886A (en) * 1958-11-24 1963-03-13 Rolls Royce Improvements in or relating to gas turbine engines
US2961150A (en) * 1958-12-30 1960-11-22 Gen Electric Frame structure for turbo-machine
US6561757B2 (en) * 2001-08-03 2003-05-13 General Electric Company Turbine vane segment and impingement insert configuration for fail-safe impingement insert retention

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE346599C (en) *
DE420781C (en) * 1924-05-03 1925-10-31 Heinrich Blumer Gas turbine with cooling of the rotor blades
FR824013A (en) * 1935-11-26 1938-01-31 Blade fixing system for rotating machines
US2154481A (en) * 1933-01-09 1939-04-18 Herpen & Vorkauf Power plant
FR897034A (en) * 1942-08-07 1945-03-09 Porsche Kg Air-cooled machine group
US2540456A (en) * 1948-10-29 1951-02-06 Sirius Corp Power boost unit for propeller shafts
US2563269A (en) * 1943-05-22 1951-08-07 Lockheed Aircraft Corp Gas turbine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE346599C (en) *
DE420781C (en) * 1924-05-03 1925-10-31 Heinrich Blumer Gas turbine with cooling of the rotor blades
US2154481A (en) * 1933-01-09 1939-04-18 Herpen & Vorkauf Power plant
FR824013A (en) * 1935-11-26 1938-01-31 Blade fixing system for rotating machines
FR897034A (en) * 1942-08-07 1945-03-09 Porsche Kg Air-cooled machine group
US2563269A (en) * 1943-05-22 1951-08-07 Lockheed Aircraft Corp Gas turbine
US2540456A (en) * 1948-10-29 1951-02-06 Sirius Corp Power boost unit for propeller shafts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0534207A1 (en) * 1991-09-27 1993-03-31 Westinghouse Electric Corporation Gas turbine vane cooling air insert

Also Published As

Publication number Publication date
GB696558A (en) 1953-09-02
CH294841A (en) 1953-11-30
DE881425C (en) 1953-06-29

Similar Documents

Publication Publication Date Title
US2510645A (en) Air nozzle and porting for combustion chamber liners
US2458497A (en) Combustion chamber
US2625792A (en) Flame tube having telescoping walls with fluted ends to admit air
JPH04303104A (en) Cooling shroud supporter
GB1311630A (en) Gas turbine power plant
US2796231A (en) High pressure steam turbine casing structure
US2633338A (en) Heat exchanger
US2812156A (en) Gas turbine having means for cooling the stator
WO2001022019A1 (en) A spiral heat exchanger
RU2007127556A (en) COMBUSTION CHAMBER WALL VENTILATION SYSTEM, GAS TURBINE ENGINE CONTAINING SUCH SYSTEM AND RING COMPARTMENT FOR THE INDICATED SYSTEM
US2339779A (en) Liquid cooled, multiringed turbine rotor
US3189086A (en) Heat exchanger with concentric flow passageways
US2667326A (en) Gas turbine
US3134432A (en) Heat exchanger
US3816871A (en) Soot blower lance
US2470860A (en) Heater
US2752197A (en) Rotary nozzle for soot blowers and the like
US2367223A (en) Combined centrifugal compressor and cooler
US2706106A (en) Heat exchange apparatus
US2396484A (en) Intercooled compressing apparatus
US2609040A (en) Combustion apparatus using compressed air
US2239685A (en) Heat exchanger
US3362468A (en) Surface condenser
GB620674A (en) Improvements in or relating to heat-exchangers
US6568902B2 (en) Device for cooling a component subject to temperature stress of nonuniform intensity