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EP1953479A2 - Device for cooling an electrical device in a turbomachine - Google Patents

Device for cooling an electrical device in a turbomachine Download PDF

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Publication number
EP1953479A2
EP1953479A2 EP08290032A EP08290032A EP1953479A2 EP 1953479 A2 EP1953479 A2 EP 1953479A2 EP 08290032 A EP08290032 A EP 08290032A EP 08290032 A EP08290032 A EP 08290032A EP 1953479 A2 EP1953479 A2 EP 1953479A2
Authority
EP
European Patent Office
Prior art keywords
air
cooling
turbomachine
outlet
vortex tube
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Withdrawn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
EP08290032A
Other languages
German (de)
French (fr)
Other versions
EP1953479A3 (en
Inventor
Eric De Wergifosse
Huguette Fichefet
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.)
Safran Transmission Systems SAS
Original Assignee
Hispano Suiza SA
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 Hispano Suiza SA filed Critical Hispano Suiza SA
Publication of EP1953479A2 publication Critical patent/EP1953479A2/en
Publication of EP1953479A3 publication Critical patent/EP1953479A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/02—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using Joule-Thompson effect; using vortex effect
    • F25B9/04—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using Joule-Thompson effect; using vortex effect using vortex effect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates to a device for cooling an electrical or electronic equipment in a turbomachine.
  • a turbomachine comprises a certain number of electrical or electronic equipment, such as actuator control boxes of variable geometries, which generate in operation a large quantity of heat which must be evacuated in order to maintain acceptable temperatures at this equipment. as well as at the level of certain elements of the turbomachine situated in the vicinity of this equipment.
  • Known cooling devices generally comprise means for circulating a cooling fluid such as oil, fuel or air, and are often bulky and complex to implement. In addition, these devices have risks of leakage and must be the subject of regular maintenance operations, which are long and expensive.
  • the invention aims in particular to provide a simple solution effective and economical to these problems.
  • a device for cooling an electrical equipment in a turbomachine comprising at least one Vortex tube comprising an inlet connected to means for supplying pressurized air, and a cold air outlet connected to means for cooling of the electrical equipment, characterized in that the Vortex tube is supplied with pressurized air via a heat exchanger comprising a secondary circuit supplied with cooling fluid by the outlet of the cooling means of the electrical equipment or by the hot air outlet of the Vortex tube.
  • the Vortex tube also called Ranque tube, allows to create by vortex effect a cold air flow and a hot air flow to from a flow of compressed air at intermediate temperature.
  • the inlet air is injected tangentially into a chamber connected to the tube to create a fast swirling flow that goes to one end of the tube, equipped with a conical outlet valve. Part of this air exits the tube through this valve, and the other part of this air is reflected on this valve and then progresses in the tube in the opposite direction by swirling inside the injected air and yielding the heat to that air, then exit through the opposite end of the tube.
  • the cooling device comprises one or more Vortex tubes which are supplied with pressurized air taken by appropriate means on a compressor of the turbomachine or in an annular flow duct of a secondary air stream such that the fan duct of the turbomachine.
  • the cold air outlet of each Vortex tube is connected to a heat exchanger associated with the equipment to be cooled, or to an air injection system of the electrical equipment to be cooled.
  • Vortex tubes are simple to make and use and allow the production of cold air with locally available resources. They are fed with air at a pressure of several bars (typically between 5 and 10 bar) and generate cold air at a temperature that can be about 50 ° C lower than the inlet air temperature. In addition, Vortex tubes are inexpensive, reliable and have a relatively long service life without requiring any particular maintenance, because they do not have moving parts.
  • the cooling device may comprise a heat exchanger of which a primary circuit has an input connected to the outlet of the air sampling means and an outlet connected to the inlet of the Vortex tube, and of which at least one secondary circuit is supplied with fluid. cooling.
  • At least part of the air used to cool the electrical equipment can be injected into a secondary circuit of the exchanger for help cool the air taken from the turbomachine.
  • the air from the hot outlet of the Vortex tube can be injected into a secondary circuit of this exchanger to help cool the air taken when its temperature is lower than that of the air taken from the turbomachine.
  • the heat exchanger may therefore comprise two secondary circuits supplied with cooling air, one by the output of the cooling means of the electrical equipment, the other by the hot air outlet of the Vortex tube.
  • the Vortex tube may be of the double circuit type and then comprises a second input connected to the pressurized air supply means, this arrangement making it possible to double the efficiency.
  • Vortex tubes associated in series or in parallel to cool the electrical or electronic equipment.
  • the invention also relates to a turbomachine, characterized in that it comprises a device for cooling electrical or electronic equipment as described above.
  • the figure 1 very schematically represents a device according to the invention for cooling an electrical or electronic equipment 12 in a turbomachine 10, this device comprising a Vortex tube 14 or Ranque tube fed with pressurized air which is taken from an element 16 of the turbomachine, this element 16 being for example a fan duct, a low-pressure compressor or high pressure, or a smaller auxiliary compressor driven by an accessory housing of the turbomachine.
  • this element 16 being for example a fan duct, a low-pressure compressor or high pressure, or a smaller auxiliary compressor driven by an accessory housing of the turbomachine.
  • the Vortex tube 14 comprises an inlet 18 which opens into a chamber 20 formed between the ends of the tube, the latter having an outlet 22 of hot air at one of its ends and at the other of its ends an outlet 24 cold air.
  • the well-known operation of the Vortex tube will be described in detail in the following with reference to Figures 2 and 3 .
  • the cooling device further comprises a heat exchanger 30 with one or more stages comprising a primary circuit whose input 32 is connected to means for withdrawing air from the element 16 of the turbomachine, and whose outlet 36 is connected via a conduit 38 to the inlet 18 of the Vortex tube 14.
  • the air taken is cooled in the exchanger 30 by convection (and also by radiation) and / or by heat exchange with a cooling fluid passing through a secondary circuit 31 of the exchanger 30.
  • the heat exchanger 30 may comprise another secondary coolant circuit, whose input 40 is here connected by a conduit 42 to the outlet of an exchanger 50 for cooling the electrical equipment, the rejected air at the outlet 44 of this secondary circuit of the heat exchanger 30 which can be used for cooling elements of the turbomachine.
  • the hot air outlet 22 of the Vortex tube 14 may be connected via a duct 46 to an inlet 34 of another secondary circuit of the exchanger 30.
  • the cold air outlet 24 of the Vortex tube is connected to either the exchanger 50 or to an air injection system associated with the electrical equipment 12, this electrical element being for example an electronic control unit for geometries. variables of the turbomachine.
  • the device may also comprise means for filtering the pressurized air which are mounted at 32 or 38 to limit the wear of the Vortex tube and thus increase its service life.
  • the cooling device operates in the following manner: pressurized air is taken from the element 16 and passes into the primary circuit of the heat exchanger 30 to be cooled by heat exchange with a cooling fluid circulating in the secondary circuit 31 and possibly with the air flowing in the secondary circuit 40-44 of the exchanger 30 and with the hot air supplied by the outlet 22 of the Vortex tube.
  • the cooled air leaving the exchanger 30 is injected tangentially into the chamber 20 of the tube which is located near the first end 24 of the tube ( figure 2 ).
  • This chamber 20 has a generally cylindrical shape so as to move the injected air and create a swirling flow 52 fast inside the tube, this flow towards the second end 22 of the tube (arrow 54).
  • the air at the outer periphery of the vortex is relatively hot while the air on the inner periphery of the vortex is relatively cold.
  • a frustoconical control valve 56 is mounted in the second end 22 of the tube and defines with the inner surface of the tube an annular air outlet channel located on the outer periphery of the vortex, that is to say the air hot (arrows 58).
  • the central part of the vortex flow is reflected on the valve 56 and forms a second vortex 60 which flows in the opposite direction inside the first vortex 52 (arrow 62), yielding heat thereto, the first end 24 of the tube (arrow 64).
  • the vortex tube may be of the dual circuit type and then include a second air inlet at its end 22 opposite the chamber 20 to improve the efficiency of the tube, as is well known in the art.
  • an orifice 66 coaxial with the tube is formed in the control valve 56 and can be connected to air supply means (arrow 68), this air having for example the same temperature and a lower pressure than the air injected into the chamber 20.
  • the air flow taken from the element 16 and passing through the heat exchanger 30 is 2833L / min, this air having a pressure of 6.3 bars and a temperature of 200 ° C.
  • the cooling fluid which supplies the secondary circuit 31 of the heat exchanger 30 is air at a temperature of 90 ° C. and makes it possible to reduce the temperature of the pressurized air supplying the Vortex tube 14 to 100 ° C. .
  • the exchanger 50 is fed with cold air at a flow rate of 1840L / min, this air having at the inlet of the exchanger 50 a temperature of 57 ° C. and at the outlet of the exchanger a temperature of the order of 80-90 ° C, this air can subsequently be injected into a secondary circuit of the exchanger via the conduit 42.
  • Vortex tubes 14 may be connected in series or in parallel to provide cooling for one or more electrical or electronic equipment.
  • the sizing of the or each Vortex tube depends on the flow rate and temperature of the cold air at the outlet of the tube which are determined according to the type of equipment to be cooled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

The device has a double circuit type vortex tube (14) i.e. ranque tube, comprising an inlet (18) connected to an element (16) e.g. low pressure compressor of turbomachine (10), and a cool air outlet (24) connected to a heat exchanger (50). The outlet of the tube is connected to an inlet (34) of a secondary circuit of the heat exchanger. The tubes supplies, at the outlet, cool air whose temperature is 50 degree Celsius lower than the temperature of pressurized air supplied at the inlet (18).

Description

La présente invention concerne un dispositif de refroidissement d'un équipement électrique ou électronique dans une turbomachine.The present invention relates to a device for cooling an electrical or electronic equipment in a turbomachine.

Une turbomachine comporte un certain nombre d'équipements électriques ou électroniques, tels que des boîtiers de commande d'actionneurs de géométries variables, qui génèrent en fonctionnement une grande quantité de chaleur qui doit être évacuée afin de maintenir des températures acceptables au niveau de ces équipements électriques ainsi qu'au niveau de certains éléments de la turbomachine situés au voisinage de ces équipements.A turbomachine comprises a certain number of electrical or electronic equipment, such as actuator control boxes of variable geometries, which generate in operation a large quantity of heat which must be evacuated in order to maintain acceptable temperatures at this equipment. as well as at the level of certain elements of the turbomachine situated in the vicinity of this equipment.

Les dispositifs de refroidissement connus comprennent en général des moyens de circulation d'un fluide de refroidissement tel que de l'huile, du carburant ou de l'air, et sont souvent volumineux et complexes à mettre en oeuvre. De plus, ces dispositifs présentent des risques de fuite et doivent faire l'objet d'opérations régulières de maintenance, qui sont longues et coûteuses.Known cooling devices generally comprise means for circulating a cooling fluid such as oil, fuel or air, and are often bulky and complex to implement. In addition, these devices have risks of leakage and must be the subject of regular maintenance operations, which are long and expensive.

L'invention a notamment pour but d'apporter une solution simple efficace et économique à ces problèmes.The invention aims in particular to provide a simple solution effective and economical to these problems.

Elle propose à cet effet un dispositif de refroidissement d'un équipement électrique dans une turbomachine, comprenant au moins un tube Vortex comportant une entrée raccordée à des moyens d'alimentation en air pressurisé, et une sortie d'air froid raccordée à des moyens de refroidissement de l'équipement électrique, caractérisé en ce que le tube Vortex est alimenté en air pressurisé par l'intermédiaire d'un échangeur thermique comprenant un circuit secondaire alimenté en fluide de refroidissement par la sortie des moyens de refroidissement de l'équipement électrique ou par la sortie d'air chaud du tube Vortex.To this end, it proposes a device for cooling an electrical equipment in a turbomachine, comprising at least one Vortex tube comprising an inlet connected to means for supplying pressurized air, and a cold air outlet connected to means for cooling of the electrical equipment, characterized in that the Vortex tube is supplied with pressurized air via a heat exchanger comprising a secondary circuit supplied with cooling fluid by the outlet of the cooling means of the electrical equipment or by the hot air outlet of the Vortex tube.

De façon connue, le tube Vortex, aussi appelé tube de Ranque, permet de créer par effet vortex un flux d'air froid et un flux d'air chaud à partir d'un flux d'air comprimé à température intermédiaire. L'air en entrée est injecté tangentiellement dans une chambre raccordée au tube pour créer un écoulement tourbillonnaire rapide qui se dirige vers une extrémité du tube, équipée d'une valve conique de sortie. Une partie de cet air sort du tube par cette valve, et l'autre partie de cet air est réfléchie sur cette valve et progresse alors dans le tube en sens inverse en tourbillonnant à l'intérieur de l'air injecté et en cédant de la chaleur à cet air, puis sort par l'extrémité opposée du tube.In known manner, the Vortex tube, also called Ranque tube, allows to create by vortex effect a cold air flow and a hot air flow to from a flow of compressed air at intermediate temperature. The inlet air is injected tangentially into a chamber connected to the tube to create a fast swirling flow that goes to one end of the tube, equipped with a conical outlet valve. Part of this air exits the tube through this valve, and the other part of this air is reflected on this valve and then progresses in the tube in the opposite direction by swirling inside the injected air and yielding the heat to that air, then exit through the opposite end of the tube.

Le dispositif de refroidissement selon l'invention comprend un ou plusieurs tubes Vortex qui sont alimentés en air pressurisé prélevé par des moyens appropriés sur un compresseur de la turbomachine ou dans une conduite annulaire d'écoulement d'un flux d'air secondaire telle que la conduite de soufflante de la turbomachine. La sortie d'air froid de chaque tube Vortex est raccordée à un échangeur de chaleur associé à l'équipement à refroidir, ou à un système d'injection d'air de l'équipement électrique à refroidir.The cooling device according to the invention comprises one or more Vortex tubes which are supplied with pressurized air taken by appropriate means on a compressor of the turbomachine or in an annular flow duct of a secondary air stream such that the fan duct of the turbomachine. The cold air outlet of each Vortex tube is connected to a heat exchanger associated with the equipment to be cooled, or to an air injection system of the electrical equipment to be cooled.

Les tubes Vortex sont simples à réaliser et à mettre en oeuvre et permettent de produire de l'air froid avec les ressources disponibles localement. Ils sont alimentés en air à une pression de plusieurs bars (typiquement comprise entre 5 et 10 bars) et génèrent de l'air froid à une température qui peut être d'environ 50°C inférieure à la température de l'air en entrée. Par ailleurs, les tubes Vortex sont peu coûteux, fiables et ont une durée de vie relativement grande sans nécessiter d'entretien particulier, car ils ne comportent pas de pièce mobile.Vortex tubes are simple to make and use and allow the production of cold air with locally available resources. They are fed with air at a pressure of several bars (typically between 5 and 10 bar) and generate cold air at a temperature that can be about 50 ° C lower than the inlet air temperature. In addition, Vortex tubes are inexpensive, reliable and have a relatively long service life without requiring any particular maintenance, because they do not have moving parts.

Le dispositif de refroidissement peut comprendre un échangeur thermique dont un circuit primaire a une entrée raccordée à la sortie des moyens de prélèvement d'air et une sortie raccordée à l'entrée du tube Vortex, et dont au moins un circuit secondaire est alimenté en fluide de refroidissement.The cooling device may comprise a heat exchanger of which a primary circuit has an input connected to the outlet of the air sampling means and an outlet connected to the inlet of the Vortex tube, and of which at least one secondary circuit is supplied with fluid. cooling.

Une partie au moins de l'air ayant servi à refroidir l'équipement électrique peut être injectée dans un circuit secondaire de l'échangeur pour aider à refroidir l'air prélevé sur la turbomachine. De même, l'air provenant de la sortie chaude du tube Vortex peut être injecté dans un circuit secondaire de cet échangeur pour aider à refroidir l'air prélevé lorsque sa température est inférieure à celle de l'air prélevé sur la turbomachine. L'échangeur thermique peut donc comprendre deux circuits secondaires alimentés en air de refroidissement, l'un par la sortie des moyens de refroidissement de l'équipement électrique, l'autre par la sortie d'air chaud du tube Vortex.At least part of the air used to cool the electrical equipment can be injected into a secondary circuit of the exchanger for help cool the air taken from the turbomachine. Similarly, the air from the hot outlet of the Vortex tube can be injected into a secondary circuit of this exchanger to help cool the air taken when its temperature is lower than that of the air taken from the turbomachine. The heat exchanger may therefore comprise two secondary circuits supplied with cooling air, one by the output of the cooling means of the electrical equipment, the other by the hot air outlet of the Vortex tube.

Le tube Vortex peut être du type à double circuit et comprend alors une seconde entrée raccordée aux moyens d'alimentation en air pressurisé, cette disposition permettant de doubler le rendement.The Vortex tube may be of the double circuit type and then comprises a second input connected to the pressurized air supply means, this arrangement making it possible to double the efficiency.

On peut par ailleurs utiliser plusieurs tubes Vortex associés en série ou en parallèle pour refroidir les équipements électriques ou électroniques.It is also possible to use several Vortex tubes associated in series or in parallel to cool the electrical or electronic equipment.

L'invention concerne également une turbomachine, caractérisée en ce qu'elle comprend un dispositif de refroidissement d'équipements électriques ou électroniques tel que décrit ci-dessus.The invention also relates to a turbomachine, characterized in that it comprises a device for cooling electrical or electronic equipment as described above.

L'invention sera mieux comprise et d'autres détails, caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description suivante faite à titre d'exemple non limitatif et en référence aux dessins annexés, dans lesquels :

  • la figure 1 représente très schématiquement un dispositif selon l'invention de refroidissement d'un équipement électrique d'une turbomachine,
  • la figure 2 est une vue schématique en coupe axiale d'un tube Vortex du dispositif de refroidissement selon l'invention ;
  • la figure 3 est une vue en coupe selon la ligne III-III de la figure 2.
The invention will be better understood and other details, characteristics and advantages of the present invention will appear on reading the following description given by way of nonlimiting example and with reference to the appended drawings, in which:
  • the figure 1 very schematically represents a device according to the invention for cooling an electrical equipment of a turbomachine,
  • the figure 2 is a schematic view in axial section of a Vortex tube of the cooling device according to the invention;
  • the figure 3 is a sectional view along line III-III of the figure 2 .

La figure 1 représente de manière très schématique un dispositif selon l'invention de refroidissement d'un équipement électrique ou électronique 12 dans une turbomachine 10, ce dispositif comprenant un tube Vortex 14 ou tube de Ranque alimenté en air pressurisé qui est prélevé sur un élément 16 de la turbomachine, cet élément 16 étant par exemple une conduite de soufflante, un compresseur basse-pression ou haute-pression, ou un compresseur auxiliaire de plus petite taille entraîné par un boîtier d'accessoires de la turbomachine.The figure 1 very schematically represents a device according to the invention for cooling an electrical or electronic equipment 12 in a turbomachine 10, this device comprising a Vortex tube 14 or Ranque tube fed with pressurized air which is taken from an element 16 of the turbomachine, this element 16 being for example a fan duct, a low-pressure compressor or high pressure, or a smaller auxiliary compressor driven by an accessory housing of the turbomachine.

Le tube Vortex 14 comprend une entrée 18 qui débouche dans une chambre 20 formée entre les extrémités du tube, celui-ci comportant une sortie 22 d'air chaud à l'une de ses extrémités et à l'autre de ses extrémités une sortie 24 d'air froid. Le fonctionnement bien connu du tube Vortex sera décrit en détail dans ce qui suit en référence aux figures 2 et 3.The Vortex tube 14 comprises an inlet 18 which opens into a chamber 20 formed between the ends of the tube, the latter having an outlet 22 of hot air at one of its ends and at the other of its ends an outlet 24 cold air. The well-known operation of the Vortex tube will be described in detail in the following with reference to Figures 2 and 3 .

Dans l'exemple représenté, le dispositif de refroidissement comprend en outre un échangeur thermique 30 à un ou plusieurs étages comprenant un circuit primaire dont une entrée 32 est raccordée à des moyens de prélèvement d'air sur l'élément 16 de la turbomachine, et dont la sortie 36 est raccordée par un conduit 38 à l'entrée 18 du tube Vortex 14.In the example shown, the cooling device further comprises a heat exchanger 30 with one or more stages comprising a primary circuit whose input 32 is connected to means for withdrawing air from the element 16 of the turbomachine, and whose outlet 36 is connected via a conduit 38 to the inlet 18 of the Vortex tube 14.

L'air prélevé est refroidi dans l'échangeur 30 par convection (et également par radiation) naturelle et/ou par échange de chaleur avec un fluide de refroidissement passant dans un circuit secondaire 31 de l'échangeur 30.The air taken is cooled in the exchanger 30 by convection (and also by radiation) and / or by heat exchange with a cooling fluid passing through a secondary circuit 31 of the exchanger 30.

Eventuellement, l'échangeur thermique 30 peut comprendre un autre circuit secondaire de fluide de refroidissement, dont l'entrée 40 est ici reliée par un conduit 42 à la sortie d'un échangeur 50 servant à refroidir l'équipement électrique, l'air rejeté à la sortie 44 de ce circuit secondaire de l'échangeur thermique 30 pouvant être utilisé pour refroidir des éléments de la turbomachine.Optionally, the heat exchanger 30 may comprise another secondary coolant circuit, whose input 40 is here connected by a conduit 42 to the outlet of an exchanger 50 for cooling the electrical equipment, the rejected air at the outlet 44 of this secondary circuit of the heat exchanger 30 which can be used for cooling elements of the turbomachine.

De même, la sortie 22 d'air chaud du tube Vortex 14 peut être raccordée par un conduit 46 à une entrée 34 d'un autre circuit secondaire de l'échangeur 30.Similarly, the hot air outlet 22 of the Vortex tube 14 may be connected via a duct 46 to an inlet 34 of another secondary circuit of the exchanger 30.

La sortie d'air froid 24 du tube Vortex est raccordée à soit à l'échangeur 50 soit à un système d'injection d'air associé à l'équipement électrique 12, cet élément électrique étant par exemple un boîtier électronique de commande de géométries variables de la turbomachine.The cold air outlet 24 of the Vortex tube is connected to either the exchanger 50 or to an air injection system associated with the electrical equipment 12, this electrical element being for example an electronic control unit for geometries. variables of the turbomachine.

Le dispositif peut aussi comprendre des moyens de filtrage de l'air pressurisé qui sont montés en 32 ou en 38 pour limiter l'usure du tube Vortex et ainsi augmenter sa durée de vie.The device may also comprise means for filtering the pressurized air which are mounted at 32 or 38 to limit the wear of the Vortex tube and thus increase its service life.

Le dispositif de refroidissement selon l'invention fonctionne de la manière suivante : de l'air pressurisé est prélevé sur l'élément 16 et passe dans le circuit primaire de l'échangeur thermique 30 pour être refroidi par échange de chaleur avec un fluide de refroidissement circulant dans le circuit secondaire 31 ainsi éventuellement qu'avec l'air circulant dans le circuit secondaire 40-44 de l'échangeur 30 et avec l'air chaud fourni par la sortie 22 du tube Vortex. L'air refroidi sortant de l'échangeur 30 est injecté tangentiellement dans la chambre 20 du tube qui est située au voisinage de la première extrémité 24 du tube (figure 2). Cette chambre 20 a une forme générale cylindrique de manière à mettre en mouvement l'air injecté et à créer un écoulement tourbillonnaire 52 rapide à l'intérieur du tube, cet écoulement se dirigeant vers la seconde extrémité 22 du tube (flèche 54). L'air à la périphérie extérieure du tourbillon est relativement chaud tandis que l'air situé sur la périphérie intérieure du tourbillon est relativement froid.The cooling device according to the invention operates in the following manner: pressurized air is taken from the element 16 and passes into the primary circuit of the heat exchanger 30 to be cooled by heat exchange with a cooling fluid circulating in the secondary circuit 31 and possibly with the air flowing in the secondary circuit 40-44 of the exchanger 30 and with the hot air supplied by the outlet 22 of the Vortex tube. The cooled air leaving the exchanger 30 is injected tangentially into the chamber 20 of the tube which is located near the first end 24 of the tube ( figure 2 ). This chamber 20 has a generally cylindrical shape so as to move the injected air and create a swirling flow 52 fast inside the tube, this flow towards the second end 22 of the tube (arrow 54). The air at the outer periphery of the vortex is relatively hot while the air on the inner periphery of the vortex is relatively cold.

Une valve de contrôle 56 tronconique est montée dans la seconde extrémité 22 du tube et définit avec la surface intérieure du tube un canal annulaire de sortie de l'air situé sur la périphérie extérieure du tourbillon, c'est-à-dire l'air chaud (flèches 58). La partie centrale de l'écoulement tourbillonnaire est réfléchie sur la valve 56 et forme un second tourbillon 60 qui s'écoule en sens inverse à l'intérieur du premier tourbillon 52 (flèche 62), en lui cédant de la chaleur, jusqu'à la première extrémité 24 du tube (flèche 64).A frustoconical control valve 56 is mounted in the second end 22 of the tube and defines with the inner surface of the tube an annular air outlet channel located on the outer periphery of the vortex, that is to say the air hot (arrows 58). The central part of the vortex flow is reflected on the valve 56 and forms a second vortex 60 which flows in the opposite direction inside the first vortex 52 (arrow 62), yielding heat thereto, the first end 24 of the tube (arrow 64).

Le tube Vortex peut être du type à double circuit et comprend alors une seconde entrée d'air à son extrémité 22 opposée à la chambre 20 pour améliorer le rendement du tube, comme cela est bien connu dans la technique. Dans l'exemple représenté, un orifice 66 coaxial au tube est formé dans la valve de contrôle 56 et peut être raccordé à des moyens d'alimentation en air (flèche 68), cet air ayant par exemple la même température et une pression moins grande que l'air injecté dans la chambre 20.The vortex tube may be of the dual circuit type and then include a second air inlet at its end 22 opposite the chamber 20 to improve the efficiency of the tube, as is well known in the art. In the example shown, an orifice 66 coaxial with the tube is formed in the control valve 56 and can be connected to air supply means (arrow 68), this air having for example the same temperature and a lower pressure than the air injected into the chamber 20.

Dans un exemple particulier de réalisation de l'invention, le débit d'air prélevé sur l'élément 16 et passant dans l'échangeur thermique 30 est de 2833L/min, cet air ayant une pression de 6,3 bars et une température de 200°C. Le fluide de refroidissement qui alimente le circuit secondaire 31 de l'échangeur thermique 30 est de l'air à une température de 90°C et permet de diminuer la température de l'air pressurisé alimentant le tube Vortex 14 jusqu'à 100°C. L'échangeur 50 est alimenté en air froid à un débit de 1840L/min, cet air ayant à l'entrée de l'échangeur 50 une température de 57°C et à la sortie de l'échangeur une température de l'ordre de 80-90°C, cet air pouvant par la suite être injecté dans un circuit secondaire de l'échangeur via le conduit 42.In a particular embodiment of the invention, the air flow taken from the element 16 and passing through the heat exchanger 30 is 2833L / min, this air having a pressure of 6.3 bars and a temperature of 200 ° C. The cooling fluid which supplies the secondary circuit 31 of the heat exchanger 30 is air at a temperature of 90 ° C. and makes it possible to reduce the temperature of the pressurized air supplying the Vortex tube 14 to 100 ° C. . The exchanger 50 is fed with cold air at a flow rate of 1840L / min, this air having at the inlet of the exchanger 50 a temperature of 57 ° C. and at the outlet of the exchanger a temperature of the order of 80-90 ° C, this air can subsequently be injected into a secondary circuit of the exchanger via the conduit 42.

Plusieurs tubes Vortex 14 peuvent être montés en série ou en parallèle pour assurer le refroidissement d'un ou de plusieurs équipements électriques ou électroniques. Le dimensionnement du ou de chaque tube Vortex dépend du débit et de la température de l'air froid en sortie du tube qui sont déterminés en fonction du type d'équipement à refroidir.Several Vortex tubes 14 may be connected in series or in parallel to provide cooling for one or more electrical or electronic equipment. The sizing of the or each Vortex tube depends on the flow rate and temperature of the cold air at the outlet of the tube which are determined according to the type of equipment to be cooled.

Claims (10)

Dispositif de refroidissement d'un équipement électrique (12) dans une turbomachine (10), comprenant au moins un tube Vortex (14) comportant une entrée (18) raccordée à des moyens (16) d'alimentation en air pressurisé, et une sortie (24) d'air froid raccordée à des moyens (50) de refroidissement de l'équipement électrique, caractérisé en ce que le tube Vortex (14) est alimenté en air pressurisé par l'intermédiaire d'un échangeur thermique (30) comprenant un circuit secondaire alimenté en fluide de refroidissement par la sortie des moyens de refroidissement de l'équipement électrique ou par la sortie d'air chaud du tube Vortex.Apparatus for cooling an electrical equipment (12) in a turbomachine (10), comprising at least one Vortex tube (14) having an inlet (18) connected to means (16) supplying pressurized air, and an outlet (24) cold air connected to means (50) for cooling the electrical equipment, characterized in that the Vortex tube (14) is supplied with pressurized air via a heat exchanger (30) comprising a secondary circuit supplied with cooling fluid by the outlet of the cooling means of the electrical equipment or by the hot air outlet of the Vortex tube. Dispositif selon la revendication 1, caractérisé en ce que les moyens (16) d'alimentation en air pressurisé comprennent des moyens de prélèvement d'air dans une conduite annulaire d'écoulement d'un flux d'air frais ou flux secondaire de la turbomachine(10).Device according to claim 1, characterized in that the means (16) for supplying pressurized air comprise air sampling means in an annular flow duct of a fresh air flow or secondary flow of the turbomachine (10). Dispositif selon la revendication 1, caractérisé en ce que les moyens (16) d'alimentation en air pressurisé comprennent des moyens de prélèvement d'air sur un compresseur de la turbomachine.Device according to claim 1, characterized in that the means (16) for supplying pressurized air comprise means for withdrawing air from a compressor of the turbomachine. Dispositif selon la revendication 1, caractérisé en ce que les moyens (16) d'alimentation en air pressurisé comprennent un compresseur auxiliaire entraîné par un boîtier d'accessoires de la turbomachine.Device according to claim 1, characterized in that the means (16) for supplying pressurized air comprise an auxiliary compressor driven by an accessory box of the turbomachine. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'échangeur thermique (14) comprend deux circuits secondaires (40, 44) alimentés en air de refroidissement, l'un par la sortie des moyens (50) de refroidissement de l'équipement électrique, l'autre par la sortie d'air chaud du tube Vortex.Device according to one of the preceding claims, characterized in that the heat exchanger (14) comprises two secondary circuits (40, 44) supplied with cooling air, one via the outlet of the cooling means (50). electrical equipment, the other by the hot air outlet of the Vortex tube. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le tube Vortex (14) est alimenté en air à une pression de quelques bars.Device according to one of the preceding claims, characterized in that the Vortex tube (14) is supplied with air at a pressure of a few bars. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la température de l'air froid sortant du tube Vortex (14) est d'environ 50°C inférieure à la température de l'air pressurisé.Device according to one of the preceding claims, characterized in that the temperature of the cold air leaving the Vortex tube (14) is about 50 ° C lower than the temperature of the pressurized air. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le tube Vortex (14) est du type à double circuit et comprend une seconde entrée (64) raccordée aux moyens d'alimentation en air pressurisé.Device according to one of the preceding claims, characterized in that the Vortex tube (14) is of the double circuit type and comprises a second inlet (64) connected to the pressurized air supply means. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il comprend plusieurs tubes Vortex associés en série ou en parallèle.Device according to one of the preceding claims, characterized in that it comprises several Vortex tubes associated in series or in parallel. Turbomachine, caractérisée en ce qu'elle comprend un dispositif de refroidissement d'un équipement électrique selon l'une des revendications précédentes.Turbomachine, characterized in that it comprises a device for cooling an electrical equipment according to one of the preceding claims.
EP08290032A 2007-01-30 2008-01-15 Device for cooling an electrical device in a turbomachine Withdrawn EP1953479A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0700643A FR2911915B1 (en) 2007-01-30 2007-01-30 DEVICE FOR COOLING AN ELECTRICAL EQUIPMENT IN A TURBOMACHINE.

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EP1953479A2 true EP1953479A2 (en) 2008-08-06
EP1953479A3 EP1953479A3 (en) 2009-02-18

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EP (1) EP1953479A3 (en)
JP (2) JP5270181B2 (en)
CN (1) CN101235729B (en)
CA (1) CA2619146A1 (en)
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RU2465477C2 (en) 2012-10-27
CN101235729B (en) 2011-09-28
JP2013167252A (en) 2013-08-29
FR2911915A1 (en) 2008-08-01
US20080209914A1 (en) 2008-09-04
UA94912C2 (en) 2011-06-25
JP2008208830A (en) 2008-09-11
SG144866A1 (en) 2008-08-28
RU2008103373A (en) 2009-08-10
FR2911915B1 (en) 2011-06-17
JP5270181B2 (en) 2013-08-21
CA2619146A1 (en) 2008-07-30
EP1953479A3 (en) 2009-02-18
CN101235729A (en) 2008-08-06

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