EP0705907B1 - Procédé et installation pour le refroidissement au gaz de pièces à usiner - Google Patents

Procédé et installation pour le refroidissement au gaz de pièces à usiner Download PDF

Info

Publication number
EP0705907B1
EP0705907B1 EP95114288A EP95114288A EP0705907B1 EP 0705907 B1 EP0705907 B1 EP 0705907B1 EP 95114288 A EP95114288 A EP 95114288A EP 95114288 A EP95114288 A EP 95114288A EP 0705907 B1 EP0705907 B1 EP 0705907B1
Authority
EP
European Patent Office
Prior art keywords
cooling
heat exchanger
storage volume
per
furnace
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
EP95114288A
Other languages
German (de)
English (en)
Other versions
EP0705907A1 (fr
Inventor
Albrecht Dr.-Ing. Melber
Paul Dipl.-Ing. Heilmann
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.)
ALD Vacuum Technologies GmbH
Original Assignee
ALD Vacuum Technologies GmbH
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 ALD Vacuum Technologies GmbH filed Critical ALD Vacuum Technologies GmbH
Publication of EP0705907A1 publication Critical patent/EP0705907A1/fr
Application granted granted Critical
Publication of EP0705907B1 publication Critical patent/EP0705907B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F27D2009/0072—Cooling of charges therein the cooling medium being a gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F27D2009/0089—Quenching

Definitions

  • the invention relates to a method for cooling, in particular for Quenching workpieces with gases in one Heat treatment furnace and recooling in a gas cycle conveyed gases on cooling surfaces in at least one in Heat treatment furnace arranged furnace heat exchanger with a external heat dissipation unit via lines for one in a liquid circuit led liquid cooling medium is in connection.
  • the furnace heat exchangers are usually charged with water must absorb the amounts of energy described. An operation of the furnace heat exchanger with fresh water would be uneconomical and neither to represent economically and ecologically. As a result, the internal Furnace heat exchanger with an external heat dissipation unit Fan cooling connected by ambient air.
  • the invention is therefore based on the object of a method of the beginning described genus to improve that reproducible always the same cooling course of the batch can be achieved, taking it It is also desirable to use the furnace heat exchanger as much as possible to feed low temperatures of the liquid cooling medium. In particular, it would be desirable to target the amount of heat removed to be able to adapt to the respective amount of heat.
  • the size or amount of each resulting amount of heat can be adjusted so that a kind of buffer effect arises.
  • a precisely defined vacuum can by the boiling process or the evaporation of the aqueous phase of the storage volume, an exact temperature can be set that can be significantly below room temperature, even below that Freezing point can be if the cooling medium is suitable Antifreeze is added.
  • This allows the temperature difference to increase significantly to the maximum permissible temperature for the cooling medium, so that - multiplied by the amount of cooling medium - very precisely lets determine which amount of heat can be dissipated and which Have the temporal cooling processes of the workpieces.
  • the workpiece properties can be within very narrow limits or with set extremely low tolerances.
  • the storage volume in one thermally insulated storage tank also outside the cooling phase of the Workpieces exposed to a vacuum, in which the aqueous phase of the Storage volume evaporated.
  • you can use the one already described Take advantage of the operation of such heat treatment furnaces, the is that the peak value of the amount of heat to be dissipated only occurs within a few minutes while the rest of the to be dissipated The amount of heat must be dissipated gradually. Between individual cooling or quenching processes are usually temporal Intervals, so-called cycle times, of several hours, and this time you can use the storage volume with a relatively low Cool down the pumping capacity.
  • the invention also relates to a device for cooling, in particular for Quenching workpieces by gases with a Heat treatment furnace and with at least one in Heat treatment furnace arranged furnace heat exchanger for Recooling the quenching gases produced in a gas circuit Cooling surfaces of the furnace heat exchanger as well as with a via lines the external heat dissipation unit connected to the heat treatment furnace.
  • Such a device is used to solve the same problem characterized in that the heat dissipation unit has an evacuable storage tank for an aqueous cooling medium, and that a vacuum pump is connected to the storage tank.
  • furnace heat exchanger at least two heat exchanger stages arranged one behind the other in the gas flow direction has, of which at least one of the first heat exchanger stages to a normal water cycle and at least one in the gas flow direction following heat exchanger stages to the storage tank connected.
  • a heat treatment furnace 1 is shown, the vacuum furnace is trained. Its interior is in a batch area 2 and in one Cooling area 3 divided. In batch area 2 there is a batch 4 that consists of numerous workpieces and thermal insulation 5 is surrounded. This movable insulation includes two movable flaps 6 and 7, which are used to control a cooling gas flow through the openings 8 and 9 serve in the sense of the drawn flow arrows. The one for heating Charge 4 required heaters are for simplicity not shown.
  • the batch area 2 is separated from the cooling area 3 by a Wall 10 separated, which belongs to the insulation 5.
  • cooling area 3 there is an oven heat exchanger 11 with cooling surfaces 12, which are shown only very schematically, and on their secondary side a liquid cooling medium is guided in a circuit 13, to which below others include the feed line 13a and the discharge line 13b.
  • the heat exchanger 11 is surrounded by a further thermal insulation 14. This can be done by a fan 15 with a drive motor 16 Quenching gas with flaps 6 and 7 open in a cycle in the sense of the drawn flow arrows.
  • the coolant circuit 13 includes a heat dissipation unit 17, which a pressure-resistant and gas-tight storage tank 18 is made of a Thermal insulation 19 is surrounded, of which only a part is shown symbolically is.
  • a storage volume 20 is located in the storage tank 18 any of the liquids described above can exist in any But if there is a significant portion of an evaporable liquid, especially of water.
  • the storage volume includes several 1000 liters of said liquid and has a constructive Liquid level 21, above which there is a gas or vapor space 22 located.
  • the storage tank 18 is connected to a vacuum pump 24 via a line 23 connected, depending on the selected operating conditions from a mechanical vacuum pump, a pump set, or simply from one Water jet pump can exist. Any condensate that has formed can be caused by a line 25 indicated by dashed lines is returned to the storage tank become.
  • the feed line 13a for the furnace heat exchanger 11 goes through a Liquid pump 26 from the lower part of the storage tank 18, and the Return line 13b opens into the vapor space 22, so that the liquid Phase of the return can immediately mix with the storage volume 20.
  • Measuring devices 27 and 28 are used to measure pressure P and temperature T.
  • a water inlet 29 and a gas inlet 30 also belong to the storage tank 18 and a safety valve 31 through which water vapor at a pressure can escape above about 1 bar.
  • the mode of operation of such a device can be described by way of example as follows: in the storage tank 18, which has a volume of 8 m 3 , there are 5 m 3 of water with a temperature of 20 ° C.
  • the vacuum pump 14 which in this example is designed as a water jet pump, the storage tank is evacuated to a pressure of 0.0123 bar, which corresponds to a boiling point of the water of 10 ° C.
  • the temperature of the water gradually drops to 10 ° C, whereby 84.2 kg of water are evaporated.
  • the storage tank 18 is then flooded to 0.042 bar with a gas such as air or nitrogen.
  • a quenching process is then carried out in the heat treatment furnace 1, the cooling water heated in the heat exchanger 11 continuously being led through the storage tank 18 by the liquid pump 26 and cooled there accordingly.
  • the water in the storage tank 18 is gradually heated, and would only start to boil at 30 ° C at the set pressure of 0.042 bar.
  • heat amounts of about 3 megawatts are generated, which leads to a heating of the storage volume by 17.5 ° C to 27.5 ° C. This means that the water is kept below the boiling point.
  • the Heat dissipation unit 32 has a different structure than that Heat dissipation aggreat 17 in Figure 1: is located in the storage tank 18 below the constructive liquid level 21 for the storage volume 20 is a tank heat exchanger 33, which is connected to the furnace heat exchanger 11 guided cooling medium keeps separate from the storage volume 20. On this Tank heat exchangers 33 are lines 13a and 13b of the furnace heat exchanger 11 connected.
  • the one described Evaporative cooling causes large heat transfer numbers, so that one needs a correspondingly small tank heat exchanger.
  • the vacuum pump 24 is on first capacitor 34 upstream and a second capacitor 35 downstream. However, it is possible to click one of these at a time Capacitors 34 or 35 to be omitted or no capacitor at all to provide. The condensates are discharged via lines 34a and 35a returned to the storage tank 18.
  • the attachment of a tank condenser 36 is particularly advantageous in the steam room 22, i.e. above the constructive liquid level 21 for the storage volume 20. In this way, the condensate drips immediately back into the storage volume 20.
  • the time “t” is plotted dimensionless on the abscissa.
  • On the left ordinate shows the temperature T from 0 to 100 ° C, and on the right ordinate the pressure P to about 1 bar.
  • the upper curve “P” stands for pressure, and the lower curve “T” stands for temperature.
  • the Individual process sections are numbered continuously from 1 to 8. in the Section 1 finds a filling of the storage tank 18 with water Room temperature instead.
  • section 2 the evacuation of the Storage tanks 18 associated with lowering the temperature to less than 10 ° C.
  • the storage volume is at this temperature held, but the pressure P by flooding the storage tank 18 with a Gas increased according to the information above.
  • the quenching process begins at constant pressure in the storage tank 18. The temperature T rises accordingly.
  • the embodiment of Figure 4 differs from that according to Figure 1 in that the furnace heat exchanger 37 two Contains heat exchanger stages 38 and 39.
  • the gas flow direction (see arrows shown) first heat exchanger stage 38 is over Lines 38a and 38b connected to a normal water circuit, which can be an example of a recooling system, which according to the Evaporation principle works.
  • the gas flow direction immediately subsequent second heat exchanger stage 39 is in an analogous manner to the Circuit 13 connected, as shown in Figure 1. That’s it possible, a large part of the short-term heat quantities over the remove first heat exchanger stage 38 in the usual way and only the remaining amount of heat through the second heat exchanger stage 39 to be removed by evaporative cooling. It is still to be noted that in the embodiments of Figures 1 and 2, the leads 13a and 13b open directly into the storage tank 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)

Claims (19)

  1. Procédé pour le refroidissement, en particulier pour la trempe, de pièces au moyen de gaz dans un four de traitement thermique (1) et pour le refroidissement des gaz convoyés en circuit fermé, sur des surfaces de refroidissement (12) dans au moins un échangeur de chaleur (11, 37) agencé dans un four dans le four de traitement thermique (1), ledit échangeur de chaleur étant relié à une unité extérieure d'évacuation de chaleur (17, 32) via des conduits (13a, 13b) pour un fluide de refroidissement liquide mené dans un circuit fermé (13), caractérisé en ce que, dans l'unité extérieure d'évacuation de chaleur (17, 32), un volume accumulé (20) d'un fluide de refroidissement aqueux est soumis à une dépression telle qu'au moins une partie de la phase aqueuse du volume accumulé (20) est vaporisée pour l'évacuation de chaleur hors du circuit fermé (13) au moyen de l'échangeur de chaleur (11, 37).
  2. Procédé selon la revendication 1, caractérisé en ce que le fluide de refroidissement mené en circuit fermé (13) est mélangé avec le volume accumulé (20), et prélève par conséquent de la chaleur directement depuis le fluide de refroidissement mené en circuit fermé à travers l'échangeur de chaleur (11, 37).
  3. Procédé selon la revendication 1, caractérisé en ce que le fluide de refroidissement mené à travers l'échangeur de chaleur (11, 37) est mené en circuit fermé à travers le volume accumulé (20) au moyen d'un deuxième échangeur de chaleur (33) agencé dans le volume accumulé (20).
  4. Procédé selon la revendication 1, caractérisé en ce que le volume accumulé (20) est soumis, dans un réservoir accumulateur à isolation thermique (18), également hors de la phase de refroidissement des pièces, à une dépression à laquelle la phase aqueuse du volume accumulé (20) est vaporisée.
  5. Procédé selon la revendication 1, caractérisé en ce que le volume accumulé (20) est refroidi par vaporisation jusqu'à des températures maximum de 20°C, de préférence au maximum 0°C.
  6. Procédé selon la revendication 1, caractérisé en ce que l'on ajoute au fluide de refroidissement et/ou au volume accumulé (20) au moins un agent de protection antigel.
  7. Procédé selon la revendication 6, caractérisé en ce que l'on utilise au moins un agent de protection antigel du groupe comprenant les mono-alcools et les poly-alcools, ainsi que leurs sels.
  8. Procédé selon la revendication 1, caractérisé en ce que le volume accumulé (20) est tout d'abord refroidi, avant le refroidissement des pièces, à une première température T1 par application d'une pression P1, puis que l'on établit ensuite une pression P2 plus élevée, et que l'on démarre enfin l'opération de refroidissement des pièces.
  9. Procédé selon la revendication 8, caractérisé en ce que l'on augmente encore, en continu ou pas à pas, la pression P2 pendant l'opération de refroidissement des pièces.
  10. Procédé selon la revendication 1, caractérisé en ce que le volume accumulé (20) est maintenu en ébullition par un réglage de pression correspondant, au moins vers la fin de l'opération de refroidissement des pièces.
  11. Procédé selon la revendication 1, caractérisé en ce que l'eau vaporisée du volume accumulé (10) est condensée et retournée dans le volume accumulé (20).
  12. Procédé selon la revendication 11, caractérisé en ce que l'on maintient en service un condenseur à vapeur d'eau (36) dans le réservoir accumulateur (18) au-dessus du volume accumulé (20).
  13. Procédé selon la revendication 1, caractérisé en ce que l'on prévoit dans le four de traitement thermique (1) un échangeur de chaleur à plusieurs étages (37), en ce que l'on raccorde l'un au moins des premiers étages (38) de l'échangeur de chaleur, vus dans la direction d'écoulement des gaz, à un circuit fermé d'eau habituel sous pression, et en ce que l'on raccorde l'un au moins des étages suivants (39) de l'échangeur de chaleur, vus dans la direction d'écoulement des gaz, au circuit (13) avec refroidissement par évaporation sous dépression.
  14. Procédé selon la revendication 1, caractérisé en ce que l'on refroidit tout d'abord le volume accumulé (20) par abaissement de pression jusqu'à une température au-dessous de 20°C, et l'on maintient le volume accumulé dans une condition de disponibilité, en ce que l'on augmente avant le refroidissement des pièces la pression jusqu'à une valeur à laquelle ne se produit aucune ébullition du volume accumulé au commencement de l'opération de refroidissement des pièces, en ce que l'on démarre l'opération de refroidissement et qu'on la poursuit jusqu'à ce que se produise une ébullition du volume accumulé, on aspire la vapeur d'eau jusqu'à terminaison du refroidissement, l'on complète ensuite le volume accumulé vaporisé, et l'on refroidit à nouveau par refroidissement par évaporation jusqu'à l'état de départ le volume accumulé complété.
  15. Appareil pour le refroidissement, en particulier pour la trempe, de pièces, comprenant un four de traitement thermique (1) et au moins un échangeur de chaleur (11, 37) agencé dans le four de traitement thermique (1) pour le refroidissement des gaz de trempe convoyés en circuit fermé, sur des surfaces de refroidissement (12) de l'échangeur de chaleur (11, 37), et comprenant une unité d'évacuation de chaleur extérieure (17, 32), raccordée au four de traitement thermique (1) par l'intermédiaire de conduits (13a, 13b), caractérisé en ce que l'unité d'évacuation de chaleur (17, 32) est raccordée à un réservoir accumulateur susceptible d'être évacué (18) pour un fluide de refroidissement aqueux, et en ce qu'une pompe à vide (24) est raccordée au réservoir accumulateur (18).
  16. Appareil selon la revendication 15, caractérisée en ce que les conduites (13a, 13b) de l'échangeur de chaleur (11, 37) débouchent directement dans le réservoir accumulateur (18).
  17. Appareil selon la revendication 15, caractérisé en ce que dans le réservoir accumulateur (18) et au-dessous du niveau de liquide (21) déterminé par la construction pour le volume accumulé (20), est raccordé un échangeur de chaleur (33) auquel sont raccordées les conduites (13a, 13b) de l'échangeur de chaleur (11, 37).
  18. Appareil selon la revendication 15, caractérisé en ce que dans le réservoir accumulateur (18) et au-dessus du niveau de liquide (21) déterminé par la construction pour le volume accumulé (20), est agencé un condenseur (36) pour la vapeur d'eau.
  19. Appareil selon la revendication 15, caractérisé en ce que l'échangeur de chaleur (11, 37) comporte au moins deux étages d'échange de chaleur (38, 39) agencés l'un derrière l'autre, vus dans la direction d'écoulement du gaz, parmi lesquels l'un au moins des premiers étages d'échange de chaleur (38) est raccordé à un circuit fermé d'eau normal, et l'un au moins des étages d'échange de chaleur (39) qui suivent dans la direction d'écoulement des gaz est raccordé au réservoir accumulateur (18).
EP95114288A 1994-10-07 1995-09-12 Procédé et installation pour le refroidissement au gaz de pièces à usiner Expired - Lifetime EP0705907B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4435862A DE4435862C1 (de) 1994-10-07 1994-10-07 Verfahren und Vorrichtung zum Abkühlen, insbesondere zum Abschrecken, von Werkstücken durch Gase
DE4435862 1994-10-07

Publications (2)

Publication Number Publication Date
EP0705907A1 EP0705907A1 (fr) 1996-04-10
EP0705907B1 true EP0705907B1 (fr) 1999-11-10

Family

ID=6530196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114288A Expired - Lifetime EP0705907B1 (fr) 1994-10-07 1995-09-12 Procédé et installation pour le refroidissement au gaz de pièces à usiner

Country Status (2)

Country Link
EP (1) EP0705907B1 (fr)
DE (2) DE4435862C1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19820083A1 (de) * 1998-05-06 1999-11-11 Ald Vacuum Techn Gmbh Verfahren zum Abschrecken von Werkstücken und Wärmebehandlungsanlage zur Durchführung des Verfahrens
CN108411083A (zh) * 2018-04-04 2018-08-17 芜湖德海机器人科技有限公司 外热式真空热处理罐以及热处理方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2651307B1 (fr) * 1989-08-29 1993-12-17 Traitement Sous Vide Four de traitement thermique equipe de moyens de refroidissement perfectionnes.
US5121903A (en) * 1991-03-11 1992-06-16 Vacuum Furnace Systems Corporation Quenching arrangement for a furnace
DE4422588C2 (de) * 1994-06-28 1999-09-23 Ald Vacuum Techn Gmbh Verfahren zum Abschrecken von Werkstücken durch Gase und Wärmebehandlungsanlage zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
DE4435862C1 (de) 1995-08-24
DE59507217D1 (de) 1999-12-16
EP0705907A1 (fr) 1996-04-10

Similar Documents

Publication Publication Date Title
EP0690138B1 (fr) Procédé de trempe à gaz de pièces à usiner et installation de traitement thermique pour la mise en oeuvre de ce procédé
EP2095370B1 (fr) Installation technique nucléaire et procédé d'utilisation d'une installation technique nucléaire
EP0855009B1 (fr) Convertisseur thermique par sorption dote de composants supplementaires
DE3809680C2 (fr)
DE102018002201B4 (de) Wasser-Lithiumbromid-Absorptionskälteanlage
DE4200688C1 (fr)
EP2669389A1 (fr) Procédé et agencement pour récupérer de l'énergie thermique lors du traitement thermique d'une bande d'acier enroulée à froid dans un four de recuit à cloche
DE102008013933A1 (de) Verfahren und Vorrichtung zum Abtrennen eines Neutronenabsorbers von einem Kühlmittel eines Kühlkreislaufes
EP0705907B1 (fr) Procédé et installation pour le refroidissement au gaz de pièces à usiner
EP2308576B1 (fr) Evaporateur
DE626864C (de) Ausnutzung und Speicherung der Abwaerme einer kontinuierlichen Absorptionskaeltemaschine
DE102010008408B4 (de) Verfahren zum Betreiben eines Rückkühlkreislaufes mit einem Hybridkühler für eine Anlage mit einer diskontinuierlichen Wärmeabgabe und Vorrichtung hierfür
DE60028164T2 (de) Druckentlastungsvorrichtung für einen Kernreaktorbehälter
DE19833739C1 (de) Verfahren und Vorrichtung zum Abtrennen eines neutronenabsorbierenden Absorbers von einem Kühlmittel
DE2752005A1 (de) Verfahren zum kuehlen von fluessigkeit in einem geschlossenen behaelter und vorrichtung zum ausfuehren des verfahrens
DE19538348A1 (de) Absorptionswärmetransformationsanlage mit Zusatzkomponenten zur Steigerung der Nutzleistung bzw. Erweiterung der Grenzen für die Antriebs-, Nutz- oder Kühltemperaturen
EP0955384A2 (fr) Procédé de trempe à gaz de pièces à usiner et installation de traitement thermique pour la mise en oeuvre de ce procédé
DE69706892T2 (de) Vorrichtung zur rückkühlung von wärmetauscherkühlmittel
DE1962050C3 (de) Absorptions Kälteanlage und Ver fahren zum Betreiben derselben
DE1551291C3 (de) Absorptions-Kälteanlage
DE597958C (de) Verfahren zum Betriebe von Absorptionskaelteapparaten
AT143222B (de) Verfahren und Vorrichtung zum Betriebe von Siedekühlern, insbesondere für Vakuumentladungsgefäße.
DE673490C (de) Absorptionskaelteapparat mit druckausgleichendem Gas
DE2912134A1 (de) Verfahren und vorrichtung zum bodengefrieren
DE1936576A1 (de) Verfahren zur Kondensation des aus einem Dampferzeuger austretenden Dampfes und Anlage zur Durchfuehrung des Verfahrens

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19960819

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

17Q First examination report despatched

Effective date: 19990415

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed
AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19991110

REF Corresponds to:

Ref document number: 59507217

Country of ref document: DE

Date of ref document: 19991216

ET Fr: translation filed
RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: ALD VACUUM TECHNOLOGIES AG

REG Reference to a national code

Ref country code: FR

Ref legal event code: CJ

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090922

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20090922

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20090923

Year of fee payment: 15

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100912

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100912

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110531

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59507217

Country of ref document: DE

Effective date: 20110401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100930

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100912

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20091001

Year of fee payment: 15