EP2045442A1 - Agencement doté d'une source de chaleur, d'un dissipateur thermique et d'un arbre rotatif - Google Patents

Agencement doté d'une source de chaleur, d'un dissipateur thermique et d'un arbre rotatif Download PDF

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Publication number
EP2045442A1
EP2045442A1 EP07019365A EP07019365A EP2045442A1 EP 2045442 A1 EP2045442 A1 EP 2045442A1 EP 07019365 A EP07019365 A EP 07019365A EP 07019365 A EP07019365 A EP 07019365A EP 2045442 A1 EP2045442 A1 EP 2045442A1
Authority
EP
European Patent Office
Prior art keywords
region
arrangement
shaft
heat sink
cavity
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.)
Withdrawn
Application number
EP07019365A
Other languages
German (de)
English (en)
Inventor
Detlef Dr. Haje
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to EP07019365A priority Critical patent/EP2045442A1/fr
Publication of EP2045442A1 publication Critical patent/EP2045442A1/fr
Withdrawn legal-status Critical Current

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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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/08—Heating, heat-insulating or cooling means
    • F01D5/085—Heating, heat-insulating or cooling means cooling fluid circulating inside the rotor
    • F01D5/088—Heating, heat-insulating or cooling means cooling fluid circulating inside the rotor in a closed cavity
    • 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
    • F01D25/125—Cooling of bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/50—Bearings
    • F05D2240/51—Magnetic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/207—Heat transfer, e.g. cooling using a phase changing mass, e.g. heat absorbing by melting or boiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/232—Heat transfer, e.g. cooling characterized by the cooling medium

Definitions

  • the invention relates to an arrangement with a heat sink and a heat source and with a rotatably mounted shaft which extends at least from a portion of the heat source in a region of the heat sink longitudinally.
  • a particularly high heat input occurs due to a heat source located nearby. This can lead to impairment of the material quality of the shaft itself or directly adjacent components to the shaft.
  • An example of this is the attempt to store a steam turbine by means of magnetic bearings, in particular active magnetic bearings.
  • the distance of the magnetic bearings to the heat source of the hot region of the steam turbine can not be chosen arbitrarily far, so that the heat input also significantly affects the temperature at the magnetic bearing.
  • Various components of the magnetic bearing in particular a lamination, can not withstand the temperatures of up to 600 ° C. This problem hitherto prevented the use of active magnetic bearings on steam turbines or gas turbines.
  • the object of the invention the heat from a certain area of a wave, which is located in the area of influence of a heat source to dissipate as efficiently as possible or to cool this area.
  • a cavity is provided which extends at least from the region of the heat source to the region of the heat sink and in the cavity is a coolant, which is formed is that it is at least partially vaporizable in the region of the heat source and at least partially condensable in the region of the heat sink.
  • a decisive advantage of the solution according to the invention lies in the factual improvement of the actual thermal conductivity of the shaft relative to that of the shaft material. Taking advantage of the absorption and release of the enthalpy of vaporization of the circulation medium or coolant heat transport is achieved in the cross section of the shaft, which exceeds the thermal conductivity of the actual base material by orders of magnitude.
  • the rotation of the shaft is of particular advantage, since due to the density differences between the liquid cooling medium and the gaseous an advantageous separation of these two states of matter is accelerated.
  • the inner surfaces of the cavity which serve primarily the condensation of the coolant due to the heat sink, are advantageously arranged so that condensed, liquid cooling medium driven by the centrifugal force are conveyed to other regions, preferably into the region of the heat source.
  • the invention is particularly suitably used when the heat source is a hot region of a steam turbine or gas turbine.
  • the heat sink is preferably arranged in a cooled region of the shaft.
  • the heat sink may, for example, be a region of the shaft provided with cooling fins, which may possibly be exposed to an external, colder, gaseous or liquid medium.
  • the cooling fins can advantageously also serve as a flow guide, which are designed such that an overflow on the shaft surface by the surrounding fluid, is driven.
  • the flow guide elements may be formed as blades, which constantly convey fresh ambient air and at the same time have the function of a cooling rib.
  • These flow guide elements or cooling fins are expediently made of a material which is particularly thermally conductive, for example copper.
  • the invention can be used when the arrangement comprises a bearing, by means of which the shaft is rotatably mounted and which is located on the shaft between the heat source and the heat sink.
  • the bearing is not exposed in this way the full effect of the heat source but the heat is passed through the shaft on the bearing over to the heat sink.
  • the bearing is a magnetic bearing, in particular an active magnetic bearing.
  • the cavity in the region of the heat sink has a circumferentially extending condensed refrigerant collection area.
  • This collection area may be partially separated from the remainder of the cavity, if necessary by means of a circumferential ridge, or simply result in conicity of the cavity such that the higher density cooling medium as a result of the centrifugal force collects in the area of the largest diameter of the conicity.
  • the end face of the cavity can be provided in this embodiment as a surface for condensation, which is always free of condensate due to their parallelism to the direction of action of the centrifugal force, and in this way an extraordinary ensures good heat transfer.
  • the interior of the cavity may conveniently be provided with flow guide elements that support or guide a flow of coolant in the cavity.
  • spatial structures for example heat transfer ribs which increase the area in the heat transfer area, are provided in the cavity in the area of the heat sink and / or in the area of the heat source and in this way improve the overall heat transfer or accelerate the heat transfer.
  • FIG. 1 shows an arrangement 1 with a heat sink 2 and a heat source 3 on a shaft 4.
  • a bearing arrangement 6 is arranged in the longitudinal extent of the shaft 4 along a longitudinal axis 5, consisting of an active magnetic radial bearing 7 and an active Magnetaxiallager 8. Both the radial bearing 7 and the thrust bearing 8 are temperature sensitive and endure no more than 130 ° C due to the materials used.
  • the heat source 3 is part of a hot region 9 of a steam turbine 10 shown only schematically in FIG. 1.
  • the shaft 4 has a cavity 15 in its interior, in which a coolant circulating in the circuit 40 is located.
  • the driving force of the coolant circulation is on the one hand in the temperature difference between the heat sink 2 and heat source 3 and on the other hand in the centrifugal force, which separates due to the rotation of the shaft 4, the liquid components of the co-rotating coolant 16 from the gaseous components.
  • the coolant 16 evaporates in the region of the heat source 3 of the cavity 15 and separates due to the density difference and the centrifugal force towards the center of the shaft 4.
  • the refrigerant condenses 16 and the liquid condensate 20 is driven by the centrifugal force in a collecting area 21 conveys, which collecting area is formed by means of a circumferential groove 20 in the cavity 15 on the web.
  • Recesses 23 in the web 22 provide for a metered supply of the coolant 16 to the regions of the heat source 3 of the cavity 15, where the heat transfer between the inner surface of the cavity 15 and the coolant 16 is supported by means of spatial structures 25 in the form of ribs.
  • the shaft 4 terminates in the region of the heat sink 2 with an end face 26, on which the cavity 15 of the shaft 4 is closed by means of a lid 27 fastened to the shaft 4.
  • the cover 27 and the end face 26 are provided with cooling fins 29, which simultaneously operate as outer flow guide elements 30.
  • the surrounding fluid 31 or the ambient air is conveyed over the surface by the cooling fins 29 acting as flow guide elements 30 in the sense of a good heat transfer.
  • the spatial structures 25 located in the interior of the cavity 15 likewise work in the sense of a good heat transfer as internal flow guide elements 33.
  • the introduced from the heat source 3 in the shaft 4 heat energy is transported by the inventive arrangement 1 in the embodiment, the bearing assembly 6 passing quickly to the heat sink 2 and dissipated there, which reduces the temperature in the region of the bearing 6, so that the sensitive magnetic bearings take no damage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
EP07019365A 2007-10-02 2007-10-02 Agencement doté d'une source de chaleur, d'un dissipateur thermique et d'un arbre rotatif Withdrawn EP2045442A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07019365A EP2045442A1 (fr) 2007-10-02 2007-10-02 Agencement doté d'une source de chaleur, d'un dissipateur thermique et d'un arbre rotatif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07019365A EP2045442A1 (fr) 2007-10-02 2007-10-02 Agencement doté d'une source de chaleur, d'un dissipateur thermique et d'un arbre rotatif

Publications (1)

Publication Number Publication Date
EP2045442A1 true EP2045442A1 (fr) 2009-04-08

Family

ID=39283791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07019365A Withdrawn EP2045442A1 (fr) 2007-10-02 2007-10-02 Agencement doté d'une source de chaleur, d'un dissipateur thermique et d'un arbre rotatif

Country Status (1)

Country Link
EP (1) EP2045442A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL80867C (fr) * 1900-01-01
DE333211C (de) * 1919-08-06 1921-02-19 Bbc Brown Boveri & Cie Verfahren und Einrichtung bei Dampf- oder Gasturbinen mit Vorwaerts- und Rueckwaertsbeschauflung auf einer Laufradtrommel zur Nutzbarmachung der von der leerlaufenden Beschauflung erzeugten Waerme
FR897710A (fr) * 1942-06-04 1945-03-29 Rotor refroidi de turbine à gaz
DE863391C (de) * 1941-09-10 1953-01-15 Daimler Benz Ag Kuehlung von mit einem heissen Arbeitsmittel beaufschlagten, aus Leichtmetall hergestellten Laeufern fuer schnell laufende, zur Verdichtung gasfoermiger Mittel dienende Stroemungsmaschinen
GB1361047A (en) * 1970-07-10 1974-07-24 Gray V H Method and apparatus for heat transfer in rotating bodies
EP0500972A1 (fr) * 1991-02-25 1992-09-02 Asea Brown Boveri Ag Rotor de turbomachine
EP1785587A1 (fr) * 2005-11-11 2007-05-16 Siemens Aktiengesellschaft Rotor de turbomachine à refroidissement interne

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL80867C (fr) * 1900-01-01
DE333211C (de) * 1919-08-06 1921-02-19 Bbc Brown Boveri & Cie Verfahren und Einrichtung bei Dampf- oder Gasturbinen mit Vorwaerts- und Rueckwaertsbeschauflung auf einer Laufradtrommel zur Nutzbarmachung der von der leerlaufenden Beschauflung erzeugten Waerme
DE863391C (de) * 1941-09-10 1953-01-15 Daimler Benz Ag Kuehlung von mit einem heissen Arbeitsmittel beaufschlagten, aus Leichtmetall hergestellten Laeufern fuer schnell laufende, zur Verdichtung gasfoermiger Mittel dienende Stroemungsmaschinen
FR897710A (fr) * 1942-06-04 1945-03-29 Rotor refroidi de turbine à gaz
GB1361047A (en) * 1970-07-10 1974-07-24 Gray V H Method and apparatus for heat transfer in rotating bodies
EP0500972A1 (fr) * 1991-02-25 1992-09-02 Asea Brown Boveri Ag Rotor de turbomachine
EP1785587A1 (fr) * 2005-11-11 2007-05-16 Siemens Aktiengesellschaft Rotor de turbomachine à refroidissement interne

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