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EP3173720A1 - Method and facility for drying a vacuum enclosure - Google Patents

Method and facility for drying a vacuum enclosure Download PDF

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Publication number
EP3173720A1
EP3173720A1 EP15196344.4A EP15196344A EP3173720A1 EP 3173720 A1 EP3173720 A1 EP 3173720A1 EP 15196344 A EP15196344 A EP 15196344A EP 3173720 A1 EP3173720 A1 EP 3173720A1
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EP
European Patent Office
Prior art keywords
pressure
enclosure
air
chamber
cycles
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.)
Granted
Application number
EP15196344.4A
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German (de)
French (fr)
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EP3173720B1 (en
Inventor
Cleison Luis WEBBER
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.)
John Cockerill SA
Original Assignee
Cockerill Maintenance and Ingenierie 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 Cockerill Maintenance and Ingenierie SA filed Critical Cockerill Maintenance and Ingenierie SA
Priority to EP15196344.4A priority Critical patent/EP3173720B1/en
Priority to US15/778,650 priority patent/US20180347902A1/en
Priority to JP2018526899A priority patent/JP2018538504A/en
Priority to PCT/EP2016/078900 priority patent/WO2017089588A1/en
Priority to EP16808941.5A priority patent/EP3380799A1/en
Priority to RU2018122773A priority patent/RU2018122773A/en
Publication of EP3173720A1 publication Critical patent/EP3173720A1/en
Application granted granted Critical
Publication of EP3173720B1 publication Critical patent/EP3173720B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/12—Drying solid materials or objects by processes not involving the application of heat by suction

Definitions

  • the present invention relates to the field of enclosure drying.
  • the enclosure contains objects that hinder the passage of hot air and prevent it from reaching areas of the enclosure and / or objects that will remain wet especially if these areas have a conformation favoring a water accumulation.
  • the use of heat can sometimes damage elements of the enclosure (such as joints) or objects contained therein.
  • An object of the invention is to improve the drying of an enclosure. More specifically, the objective is to evacuate the water from the enclosure as quickly as possible and as completely as possible and, preferably, to be able to guarantee the absence of water in the enclosure by an indirect method.
  • the water contained in the chamber is liquid.
  • the method of the invention makes it possible to vaporize all or almost all the water contained in the chamber without going through a state of water other than steam. It is known that the energy required to pass from the liquid state to the vapor state is less important than the energy required to pass from the solid state to the vapor state for the same amount of liquid. It is recalled that the triple point of the water is obtained at the temperature of 0 ° C and the pressure of 6.01 mbar. For this pair of temperature and pressure, the water present in liquid form will solidify and then sublimate, which is not sought in the method of the invention.
  • the pressure range for vaporizing the water does not require a high level of vacuum and therefore allows the use of a relatively inexpensive and therefore less expensive air extraction technology.
  • the process of the invention is therefore particularly advantageous.
  • the control unit is a computer unit executing a program arranged to implement the drying method according to the invention, once an operator has connected the interior volume of the chamber 8 to the main pipe, to the pipe secondary and to the sensor forming the device for measuring the air pressure in the enclosure 8.
  • the drying process of the invention comprises the following subsequent steps (see figure 2 ).
  • the control unit firstly controls the pump 7 and the valves to extract air from the chamber 8 via the main and secondary lines until a pressure P2 is reached.
  • the pump 7 draws air from the enclosure 8 via the main and secondary pipes.
  • the aspiration by the secondary pipe also allows to drive some of the liquid water that could accumulate in the lower part of the enclosure under the effect of gravity: it will advantageously provide on the secondary pipe a trap to water avoiding that the water in question is brought to the pump.
  • the control unit controls the pump 7 and the valves to initiate a repetition of cycles of rise in pressure up to a pressure P1 and lowering in the vicinity of the pressure P2.
  • This operation is performed by regulating the pressure in the chamber by controlling the pump and / or the valves.
  • the pump 7 draws air from the enclosure 8 via the main pipe.
  • the valve 4 is open, air is introduced into the chamber 8 via the secondary pipe.
  • the introduction of air has two effects: it allows to raise the pressure in the enclosure but also to create in the chamber 8 a flow of air that will sweep the enclosure 8 and promote the evacuation of steam water through the main pipe.
  • pressure P2 and the pressure P1 are within a range of evaporation of the water.
  • the control unit then drives the pump 7 and the valves to interrupt the repetition and control said means for extracting air from the chamber 8 until reaching a third pressure P3 adjacent to the triple point of the water.
  • control unit controls the pump 7 and the valves to return the chamber 8 to the ambient pressure. An operator then disconnects the pressure sensor and the pipes from the enclosure 8.
  • the control unit is arranged to interrupt the drying process when a desired humidity level is reached. This moisture content is not directly measured but evaluated according to the evolution of the pressure in the chamber 8. Several criteria for stopping the drying process are used.
  • the method of the invention here comprises the step, during the extraction of air, of measuring a duration T2 necessary to reach the pressure P1 and of comparing the measured duration T2 with a reference duration tsec necessary to reach the first pressure for a desired humidity level in the enclosure.
  • the repetition of the cycles is started if the measured duration T2 is greater than the reference duration tsec.
  • the chamber 8 is directly returned to the ambient pressure if the measured duration T2 is less than or equal to the tsec reference duration: it is not necessary to repeat the cycles in this case.
  • the control unit is arranged to interrupt the repetition of the cycles when the time ⁇ ti separating two cycles is equal to a reference time ⁇ tsec corresponding to a desired humidity level in the enclosure 8. At the figure 4 , the repetition is interrupted after the cycle 10. In a variant, the control unit is arranged to interrupt the repetition of the cycles when the times ⁇ ti separating several successive cycles are equal to each other.
  • control unit is arranged to interrupt the repetition of the cycles when the slope of descent from the pressure P1 to the pressure P2 is identical to a reference slope corresponding to a desired humidity level in the chamber.
  • the repetition of the cycles is interrupted when the slope of descent from the pressure P1 to the pressure P2 is identical from one cycle to another.
  • the control unit is arranged to start a new repetition of the cycles when, during this rise in pressure since the third pressure P3, the pressure variation ⁇ P after a determined duration is greater than the pressure variation ⁇ Psec for a rate of pressure. desired humidity. If the pressure variation ⁇ P after a determined duration is less than or equal to the pressure variation ⁇ Psec, the control unit controls the pump 7 and the valves to return the chamber 8 to the ambient pressure and complete the process.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Procédé de séchage d'une enceinte, comprenant les étapes de : - raccorder l'enceinte à des moyens d'extraction et d'introduction d'air, et à un organe de mesure d'une pression d'air dans l'enceinte, - commander lesdits moyens pour extraire l'air de l'enceinte jusqu'à atteindre une première pression, - commander lesdits moyens pour entamer une répétition de cycles de remontée en pression jusqu'à une deuxième pression et de descente au voisinage de la première pression, la première pression et la deuxième pression étant comprises dans une plage d'évaporation de l'eau, - interrompre la répétition et commander lesdits moyens pour extraire l'air de l'enceinte jusqu'à atteindre une troisième pression voisine du point triple de l'eau, - remettre l'enceinte à la pression ambiante et débrancher lesdits moyens d'extraction et d'introduction d'air.A method of drying an enclosure, comprising the steps of: connecting the chamber to means for extracting and introducing air, and to a member for measuring an air pressure in the chamber, controlling said means for extracting air from the chamber until reaching a first pressure, - control said means for initiating a repetition of pressure rise cycles to a second pressure and descent in the vicinity of the first pressure, the first pressure and the second pressure being within a water evaporation range, interrupting the repetition and controlling said means for extracting air from the enclosure until reaching a third pressure close to the triple point of the water, - Return the chamber to ambient pressure and disconnect said extraction means and air introduction.

Description

La présente invention concerne le domaine du séchage d'enceinte.The present invention relates to the field of enclosure drying.

ETAT DE LA TECHNIQUESTATE OF THE ART

Après qu'une enceinte a été mouillée, par exemple à la suite d'un lavage, il est nécessaire, dans certaines applications, d'éliminer toute trace d'eau résiduelle dans l'enceinte.After an enclosure has been wetted, for example following a wash, it is necessary, in some applications, to remove any residual water in the enclosure.

Il est connu à cette fin d'introduire dans l'enceinte de l'air chaud et sec. Ce procédé est relativement efficace sauf, toutefois, lorsque l'enceinte présente des zones d'accumulation d'eau.It is known for this purpose to introduce into the enclosure hot and dry air. This method is relatively effective except, however, when the enclosure has water accumulation zones.

En outre, dans certains cas, l'enceinte contient des objets qui viennent contrarier le passage de l'air chaud et l'empêchent d'atteindre des zones de l'enceinte et/ou des objets qui resteront humides en particulier si ces zones ont une conformation favorisant une accumulation d'eau. En outre, l'utilisation de chaleur peut parfois endommager des éléments de l'enceinte (comme des joints) ou les objets contenus dans celle-ci.In addition, in some cases, the enclosure contains objects that hinder the passage of hot air and prevent it from reaching areas of the enclosure and / or objects that will remain wet especially if these areas have a conformation favoring a water accumulation. In addition, the use of heat can sometimes damage elements of the enclosure (such as joints) or objects contained therein.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Un but de l'invention est d'améliorer le séchage d'une enceinte. Plus précisément, l'objectif est d'évacuer l'eau de l'enceinte le plus rapidement possible et le plus complètement possible et, de préférence, pouvoir garantir l'absence d'eau dans l'enceinte par une méthode indirecte.An object of the invention is to improve the drying of an enclosure. More specifically, the objective is to evacuate the water from the enclosure as quickly as possible and as completely as possible and, preferably, to be able to guarantee the absence of water in the enclosure by an indirect method.

BREF EXPOSE DE L'INVENTIONBRIEF SUMMARY OF THE INVENTION

A cet effet, on prévoit, selon l'invention, un procédé de séchage d'une enceinte, comprenant les étapes de :

  • raccorder l'enceinte à des moyens d'extraction et d'introduction d'air, et à un organe de mesure d'une pression d'air dans l'enceinte,
  • commander lesdits moyens pour extraire l'air de l'enceinte jusqu'à atteindre une première pression,
  • commander lesdits moyens pour entamer une répétition de cycles de remontée en pression jusqu'à une deuxième pression et de descente au voisinage de la première pression, la première pression et la deuxième pression étant comprises dans une plage d'évaporation de l'eau,
  • interrompre la répétition et commander lesdits moyens pour extraire l'air de l'enceinte jusqu'à atteindre une troisième pression voisine du point triple de l'eau,
  • remettre l'enceinte à la pression ambiante et débrancher lesdits moyens d'extraction et d'introduction d'air.
For this purpose, according to the invention, there is provided a method of drying an enclosure, comprising the steps of:
  • connect the enclosure to means for extracting and introducing air, and to a device for measuring an air pressure in the chamber,
  • controlling said means for extracting air from the enclosure until reaching a first pressure,
  • controlling said means for initiating a repetition of pressure rise cycles to a second pressure and a descent in the vicinity of the first pressure, the first pressure and the second pressure being within a water evaporation range,
  • interrupting the repetition and controlling said means for extracting the air from the chamber until reaching a third pressure close to the triple point of the water,
  • return the enclosure to ambient pressure and disconnect said extraction means and introduction of air.

Avant la mise en oeuvre du procédé, l'eau contenue dans l'enceinte est liquide. En effectuant des cycles de montée et descente en pression dans une plage de pressions permettant la vaporisation de l'eau, le procédé de l'invention permet de vaporiser la totalité ou quasi-totalité de l'eau contenue dans l'enceinte sans passer par un état de l'eau autre que la vapeur. On sait que l'énergie nécessaire pour passer de l'état de liquide à l'état de vapeur est moins importante que l'énergie nécessaire pour passer de l'état de solide à l'état de vapeur pour une même quantité de liquide. On rappelle que le point triple de l'eau est obtenu à la température de 0°C et à la pression de 6,01 mbar. Pour ce couple de température et de pression, l'eau présente sous forme liquide se solidifiera puis se sublimera, ce qui n'est pas recherché dans le procédé de l'invention. En effet, comme la vaporisation nécessite moins d'énergie, elle prendra de ce fait moins de temps. De même la plage de pression pour vaporiser l'eau ne nécessite pas un niveau de vide important et permet donc d'utiliser une technologie d'extraction d'air relativement peu exigeante et donc moins coûteuse. Le procédé de l'invention est donc particulièrement avantageux.Before carrying out the process, the water contained in the chamber is liquid. By performing upward and downward pressure cycles in a pressure range for the vaporization of water, the method of the invention makes it possible to vaporize all or almost all the water contained in the chamber without going through a state of water other than steam. It is known that the energy required to pass from the liquid state to the vapor state is less important than the energy required to pass from the solid state to the vapor state for the same amount of liquid. It is recalled that the triple point of the water is obtained at the temperature of 0 ° C and the pressure of 6.01 mbar. For this pair of temperature and pressure, the water present in liquid form will solidify and then sublimate, which is not sought in the method of the invention. Indeed, as the vaporization requires less energy, it will take less time. Similarly, the pressure range for vaporizing the water does not require a high level of vacuum and therefore allows the use of a relatively inexpensive and therefore less expensive air extraction technology. The process of the invention is therefore particularly advantageous.

D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit de modes de réalisation particuliers non limitatifs de l'invention.Other features and advantages of the invention will emerge on reading the following description of particular non-limiting embodiments of the invention.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

Il sera fait référence aux dessins annexés, parmi lesquels :

  • la figure 1 est une vue schématique d'une installation pour la mise en oeuvre du procédé de l'invention ;
  • la figure 2 est un diagramme montrant la courbe C de pression dans l'enceinte lors de la mise en oeuvre du procédé de l'invention ;
  • les figures 3 à 6 sont des diagrammes superposant une courbe Cr de pression de référence (enceinte considérée comme sèche) et la courbe C de pression lors de la mise en oeuvre du procédé de l'invention appliquée à une enceinte humide, chacune de ces figures met en évidence un critère d'arrêt du procédé de séchage ;
  • la figure 7 est un diagramme partiel montrant une courbe Cr de référence (enceinte considérée comme sèche) et la courbe C de pression lors de la mise en oeuvre du procédé de l'invention appliquée à une enceinte humide, cette figure mettant en évidence un autre critère d'arrêt du procédé de séchage.
Reference will be made to the appended drawings, among which:
  • the figure 1 is a schematic view of an installation for carrying out the method of the invention;
  • the figure 2 is a diagram showing the pressure curve C in the chamber during the implementation of the method of the invention;
  • the Figures 3 to 6 are diagrams superimposing a curve Cr of reference pressure (chamber considered dry) and the pressure curve C during the implementation of the method of the invention applied to a wet chamber, each of these figures highlights a criterion stopping the drying process;
  • the figure 7 is a partial diagram showing a reference curve Cr (chamber considered as dry) and the pressure curve C during the implementation of the method of the invention applied to a wet chamber, this figure highlighting another criterion of stopping the drying process.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

En référence à la figure 1, le procédé de séchage selon l'invention est appliqué à une enceinte 8. Une telle enceinte est par exemple :

  • un réservoir qu'on a rempli pour le tester hydrauliquement et qu'on doit vider et sécher avant son utilisation ;
  • un réservoir qu'on a lavé et qui doit être séché avant son utilisation ;
  • un bloc moteur comprenant des renfoncements définissant des enceintes retenant des lubrifiants de coupe après usinage, lubrifiants de coupe d'éliminer par lavage et séchage avant que le bloc-moteur soit utilisé dans la suite du processus de fabrication du moteur ;
  • un réceptacle de stockage d'objets émettant des rayonnements susceptibles de créer par radiolyse de l'eau du dihydrogène qui est un composé explosif à partir d'une certaine concentration ;
  • un réceptacle de stockage d'objets craignant l'oxydation, le réceptacle devant donc être sec pour éviter une oxydation des objets contenus dans le réceptacle.
With reference to the figure 1 , the drying process according to the invention is applied to an enclosure 8. Such an enclosure is for example:
  • a tank that has been filled to test it hydraulically and that must be emptied and dried before use ;
  • a tank that has been washed and must be dried before use;
  • an engine block comprising recesses defining enclosures retaining cutting lubricants after machining, cutting lubricants washing out and drying before the engine block is used in the further manufacturing process of the engine;
  • an object storage receptacle emitting radiation capable of creating radiolysis of dihydrogen water which is an explosive compound from a certain concentration;
  • an object storage receptacle fearing oxidation, the receptacle must therefore be dry to prevent oxidation of the objects contained in the receptacle.

L'installation de séchage de l'invention comprend :

  • une pompe 7 raccordée à une unité de commande non représentée ici pour constituer un moyen d'extraction d'air hors de l'enceinte 8,
  • une conduite principale ayant une extrémité destinée à être reliée à la partie supérieure de l'enceinte 8 pour communiquer avec le volume intérieur de l'enceinte 8 et une extrémité opposée reliée à l'entrée de la pompe 7 par une vanne 1 commandée par l'unité de commande,
  • une conduite secondaire ayant une extrémité destinée à être reliée à la partie inférieure de l'enceinte 8 pour communiquer avec le volume intérieur de l'enceinte 8 et une extrémité opposée reliée à l'entrée de la pompe 7 par une vanne 3 commandée par l'unité de commande,
  • une vanne 2 de mise à l'air libre de la conduite principale commandée par l'unité de commande,
  • une vanne 4 de mise à l'air libre de la conduite secondaire, la vanne 4 étant commandée par l'unité de commande,
  • un capteur de pression 9 destiné à être monté sur l'enceinte 8 et relié à l'unité de commande.
The drying plant of the invention comprises:
  • a pump 7 connected to a control unit not shown here to constitute a means for extracting air from the enclosure 8,
  • a main pipe having an end intended to be connected to the upper part of the enclosure 8 to communicate with the internal volume of the enclosure 8 and an opposite end connected to the inlet of the pump 7 by a valve 1 controlled by the 'control unit,
  • a secondary pipe having an end intended to be connected to the lower part of the enclosure 8 to communicate with the internal volume of the enclosure 8 and an opposite end connected to the inlet of the pump 7 by a valve 3 controlled by the 'control unit,
  • a valve 2 for venting the main pipe controlled by the control unit,
  • a valve 4 for venting the secondary pipe, the valve 4 being controlled by the control unit,
  • a pressure sensor 9 intended to be mounted on the enclosure 8 and connected to the control unit.

L'unité de commande est une unité informatique exécutant un programme agencé pour mettre en oeuvre le procédé de séchage selon l'invention, une fois qu'un opérateur a raccordé le volume intérieur de l'enceinte 8 à la conduite principale, à la conduite secondaire et au capteur formant l'organe de mesure de la pression d'air dans l'enceinte 8.The control unit is a computer unit executing a program arranged to implement the drying method according to the invention, once an operator has connected the interior volume of the chamber 8 to the main pipe, to the pipe secondary and to the sensor forming the device for measuring the air pressure in the enclosure 8.

Le procédé de séchage de l'invention comprend les étapes ultérieures suivantes (voir la figure 2).The drying process of the invention comprises the following subsequent steps (see figure 2 ).

L'unité de commande pilote en premier lieu la pompe 7 et les vannes pour extraire l'air de l'enceinte 8 via les conduites principales et secondaire jusqu'à atteindre une pression P2. Lorsque les vannes 2 et 4 sont fermées tandis que les vannes 1 et 3 sont ouvertes, la pompe 7 aspire l'air de l'enceinte 8 via les conduites principale et secondaire. L'aspiration par la conduite secondaire permet également d'entraîner une partie de l'eau liquide qui pourrait s'accumuler dans la partie inférieure de l'enceinte sous l'effet de la gravité : on prévoira avantageusement sur la conduite secondaire un piège à eau évitant que l'eau en question ne soit amenée jusqu'à la pompe.The control unit firstly controls the pump 7 and the valves to extract air from the chamber 8 via the main and secondary lines until a pressure P2 is reached. When the valves 2 and 4 are closed while the valves 1 and 3 are open, the pump 7 draws air from the enclosure 8 via the main and secondary pipes. The aspiration by the secondary pipe also allows to drive some of the liquid water that could accumulate in the lower part of the enclosure under the effect of gravity: it will advantageously provide on the secondary pipe a trap to water avoiding that the water in question is brought to the pump.

Une fois la pression P2 atteinte, l'unité de commande pilote la pompe 7 et les vannes pour entamer une répétition de cycles de remontée en pression jusqu'à une pression P1 et de descente au voisinage de la pression P2. Cette opération est effectuée par une régulation de la pression dans l'enceinte par le pilotage de la pompe et/ou des vannes. Lorsque la vanne 3 est fermée et que la vanne 4 est fermée, la pompe 7 aspire l'air de l'enceinte 8 via la conduite principale. Lorsque la vanne 4 est ouverte de l'air est introduit dans l'enceinte 8 via la conduite secondaire. L'introduction d'air a deux effets : elle permet de faire remonter la pression dans l'enceinte mais aussi de créer dans l'enceinte 8 un flux d'air qui va balayer l'enceinte 8 et favoriser l'évacuation de la vapeur d'eau via la conduite principale.Once the pressure P2 has been reached, the control unit controls the pump 7 and the valves to initiate a repetition of cycles of rise in pressure up to a pressure P1 and lowering in the vicinity of the pressure P2. This operation is performed by regulating the pressure in the chamber by controlling the pump and / or the valves. When the valve 3 is closed and the valve 4 is closed, the pump 7 draws air from the enclosure 8 via the main pipe. When the valve 4 is open, air is introduced into the chamber 8 via the secondary pipe. The introduction of air has two effects: it allows to raise the pressure in the enclosure but also to create in the chamber 8 a flow of air that will sweep the enclosure 8 and promote the evacuation of steam water through the main pipe.

On notera que la pression P2 et la pression P1 sont comprises dans une plage d'évaporation de l'eau.It will be noted that the pressure P2 and the pressure P1 are within a range of evaporation of the water.

L'unité de commande pilote ensuite la pompe 7 et les vannes pour interrompre la répétition et commander lesdits moyens pour extraire l'air de l'enceinte 8 jusqu'à atteindre une troisième pression P3 voisine du point triple de l'eau.The control unit then drives the pump 7 and the valves to interrupt the repetition and control said means for extracting air from the chamber 8 until reaching a third pressure P3 adjacent to the triple point of the water.

Une fois la pression P3 atteinte, l'unité de commande pilote la pompe 7 et les vannes pour remettre l'enceinte 8 à la pression ambiante. Un opérateur débranche ensuite le capteur de pression et les conduites vis-à-vis de l'enceinte 8.Once the pressure P3 is reached, the control unit controls the pump 7 and the valves to return the chamber 8 to the ambient pressure. An operator then disconnects the pressure sensor and the pipes from the enclosure 8.

L'unité de commande est agencée pour interrompre le processus de séchage lorsqu'un taux d'humidité souhaité est atteint. Ce taux d'humidité n'est pas directement mesuré mais évalué en fonction de l'évolution de la pression dans l'enceinte 8. Plusieurs critères d'arrêt du procédé de séchage sont utilisés.The control unit is arranged to interrupt the drying process when a desired humidity level is reached. This moisture content is not directly measured but evaluated according to the evolution of the pressure in the chamber 8. Several criteria for stopping the drying process are used.

En référence à la figure 3, le procédé de l'invention comprend ici l'étape, lors de l'extraction d'air, de mesurer une durée T2 nécessaire pour atteindre la pression P1 et de comparer la durée mesurée T2 avec une durée de référence tsec nécessaire pour atteindre la première pression pour un taux d'humidité souhaité dans l'enceinte. La répétition des cycles est entamée si la durée mesurée T2 est supérieure à la durée de référence tsec. L'enceinte 8 est directement remise à la pression ambiante si la durée mesurée T2 est inférieure ou égale à la durée de référence tsec : il n'est en effet pas nécessaire de procéder à la répétition des cycles dans ce cas.With reference to the figure 3 , the method of the invention here comprises the step, during the extraction of air, of measuring a duration T2 necessary to reach the pressure P1 and of comparing the measured duration T2 with a reference duration tsec necessary to reach the first pressure for a desired humidity level in the enclosure. The repetition of the cycles is started if the measured duration T2 is greater than the reference duration tsec. The chamber 8 is directly returned to the ambient pressure if the measured duration T2 is less than or equal to the tsec reference duration: it is not necessary to repeat the cycles in this case.

En référence à la figure 4, l'unité de commande est agencée pour interrompre la répétition des cycles quand le temps Δti séparant deux cycles est égal à un temps de référence Δtsec correspondant à un taux d'humidité souhaité dans l'enceinte 8. A la figure 4, la répétition est interrompue après le cycle 10. En variante, l'unité de commande est agencée pour interrompre la répétition des cycles quand les temps Δti séparant plusieurs cycles successifs sont égaux entre eux.With reference to the figure 4 , the control unit is arranged to interrupt the repetition of the cycles when the time Δti separating two cycles is equal to a reference time Δtsec corresponding to a desired humidity level in the enclosure 8. At the figure 4 , the repetition is interrupted after the cycle 10. In a variant, the control unit is arranged to interrupt the repetition of the cycles when the times Δti separating several successive cycles are equal to each other.

En référence aux figures 5 et 6, l'unité de commande est agencée pour interrompre la répétition des cycles quand la pente de descente de la pression P1 à la pression P2 est identique à une pente de référence correspondant à un taux d'humidité souhaité dans l'enceinte. En variante, la répétition des cycles est interrompue quand la pente de descente de la pression P1 à la pression P2 est identique d'un cycle à l'autre.With reference to Figures 5 and 6 , the control unit is arranged to interrupt the repetition of the cycles when the slope of descent from the pressure P1 to the pressure P2 is identical to a reference slope corresponding to a desired humidity level in the chamber. As a variant, the repetition of the cycles is interrupted when the slope of descent from the pressure P1 to the pressure P2 is identical from one cycle to another.

En référence à la figure 7, une fois la pression P3 atteinte, la pression est observée pour voir si une remontée naturelle de la pression s'amorce. L'unité de commande est agencée pour débuter une nouvelle répétition des cycles quand, lors de cette remontée en pression depuis la troisième pression P3, la variation de pression ΔP après une durée déterminée est supérieure à la variation de pression ΔPsec pour un taux d'humidité souhaité. Si la variation de pression ΔP après une durée déterminée est inférieure ou égale à la variation de pression ΔPsec, l'unité de commande pilote la pompe 7 et les vannes pour remettre l'enceinte 8 à la pression ambiante et achever le procédé.With reference to the figure 7 Once the pressure P3 is reached, the pressure is observed to see if a natural rise in pressure begins. The control unit is arranged to start a new repetition of the cycles when, during this rise in pressure since the third pressure P3, the pressure variation ΔP after a determined duration is greater than the pressure variation ΔPsec for a rate of pressure. desired humidity. If the pressure variation ΔP after a determined duration is less than or equal to the pressure variation ΔPsec, the control unit controls the pump 7 and the valves to return the chamber 8 to the ambient pressure and complete the process.

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits mais englobe toute variante entrant dans le champ de l'invention telle que définie par les revendications.Of course, the invention is not limited to embodiments described but encompasses any variant within the scope of the invention as defined by the claims.

En particulier, il est possible de jouer sur d'autres facteurs pour accélérer le séchage et notamment sur le débit de la pompe (plus le débit est fort et plus le séchage est rapide) et/ou sur la température dans l'enceinte (plus la température est élevée et plus le séchage est rapide).In particular, it is possible to play on other factors to accelerate the drying and in particular the flow rate of the pump (the higher the flow rate and the faster the drying) and / or the temperature in the enclosure (more the temperature is high and the drying is faster).

Il est possible également d'orienter l'enceinte pour réduire les zones d'accumulations d'eau.It is also possible to orient the enclosure to reduce areas of water accumulation.

Claims (7)

Procédé de séchage d'une enceinte, comprenant les étapes de : - raccorder l'enceinte à des moyens d'extraction et d'introduction d'air, et à un organe de mesure d'une pression d'air dans l'enceinte, - commander lesdits moyens pour extraire l'air de l'enceinte jusqu'à atteindre une première pression, - commander lesdits moyens pour entamer une répétition de cycles de remontée en pression jusqu'à une deuxième pression et de descente au voisinage de la première pression, la première pression et la deuxième pression étant comprises dans une plage d'évaporation de l'eau, - interrompre la répétition et commander lesdits moyens pour extraire l'air de l'enceinte jusqu'à atteindre une troisième pression voisine du point triple de l'eau, - remettre l'enceinte à la pression ambiante et débrancher lesdits moyens d'extraction et d'introduction d'air. A method of drying an enclosure, comprising the steps of: connecting the chamber to means for extracting and introducing air, and to a member for measuring an air pressure in the chamber, controlling said means for extracting air from the chamber until reaching a first pressure, - control said means for initiating a repetition of pressure rise cycles to a second pressure and descent in the vicinity of the first pressure, the first pressure and the second pressure being within a range of evaporation of water, interrupting the repetition and controlling said means for extracting air from the enclosure until reaching a third pressure close to the triple point of the water, - Return the chamber to ambient pressure and disconnect said extraction means and air introduction. Procédé selon la revendication 1, comprenant, lors de l'extraction d'air, l'étape de mesurer une durée nécessaire pour atteindre la première pression et de comparer la durée mesurée avec une durée de référence nécessaire pour atteindre la première pression pour un taux d'humidité souhaité dans l'enceinte ; la répétition des cycles étant entamée si la durée mesurée est supérieure à la durée de référence et l'enceinte étant remise à la pression ambiante si la durée mesurée est inférieure ou égale à la durée de référence.A method according to claim 1 comprising, during air extraction, the step of measuring a time necessary to reach the first pressure and comparing the measured duration with a reference time necessary to reach the first pressure for a rate. desired humidity in the enclosure; the repetition of the cycles being started if the measured duration is greater than the reference duration and the chamber is returned to the ambient pressure if the measured duration is less than or equal to the reference duration. Procédé selon la revendication 1, dans lequel la répétition des cycles est interrompue quand la condition suivante est détectée : le temps séparant deux cycles est égal à un temps de référence correspondant à un taux d'humidité souhaité dans l'enceinte.A method according to claim 1, wherein the repetition of the cycles is interrupted when the following condition is detected: the time separating two cycles is equal to a reference time corresponding to a desired humidity level in the chamber. Procédé selon la revendication 1, dans lequel la répétition des cycles est interrompue quand la condition suivante est détectée : la pente de descente de la deuxième pression à la première pression est identique d'un cycle à l'autre.The method of claim 1, wherein the cycles repeat is interrupted when the following condition is detected: the descent slope of the second pressure at the first pressure is the same from one cycle to another. Procédé selon la revendication 1, dans lequel la répétition des cycles est interrompue quand la condition suivante est détectée : la pente de descente de la deuxième pression à la première pression est identique à une pente de référence correspondant à un taux d'humidité souhaité dans l'enceinte.A method according to claim 1, wherein the repetition of the cycles is interrupted when the following condition is detected: the descent slope of the second pressure at the first pressure is identical to a reference slope corresponding to a desired humidity level in the 'pregnant. Procédé selon la revendication 1, dans lequel une nouvelle répétition des cycles est débutée quand, lors de la remontée en pression depuis la troisième pression, la variation de pression après une durée déterminée est supérieure à la variation de pression pour un taux d'humidité souhaité.A method according to claim 1, wherein a further repetition of the cycles is started when, during the pressure build-up from the third pressure, the pressure change after a predetermined time is greater than the pressure change for a desired humidity level . Installation de séchage pour la mise en oeuvre du procédé selon l'une quelconque des revendications précédentes, qui comprend : - une pompe (7) raccordée à une unité de commande pour constituer un moyen d'extraction d'air hors de l'enceinte (8), - une conduite principale ayant une extrémité destinée à être reliée à la partie supérieure de l'enceinte (8) pour communiquer avec le volume intérieur de l'enceinte (8) et une extrémité opposée reliée à l'entrée de la pompe (7), - une conduite secondaire ayant une extrémité destinée à être reliée à la partie inférieure de l'enceinte (8) pour communiquer avec le volume intérieur de l'enceinte (8) et pourvue d'une vanne (4) d'introduction d'air, la vanne (4) étant commandée par l'unité de commande, - un capteur de pression (9) destiné à être monté sur l'enceinte (8) et relié à l'unité de commande. Drying plant for carrying out the method according to any one of the preceding claims, which comprises: a pump (7) connected to a control unit for constituting a means for extracting air from the enclosure (8), a main pipe having an end intended to be connected to the upper part of the enclosure (8) to communicate with the interior volume of the enclosure (8) and an opposite end connected to the inlet of the pump (7) , a secondary pipe having an end intended to be connected to the lower part of the enclosure (8) to communicate with the interior volume of the enclosure (8) and provided with an air introduction valve (4) , the valve (4) being controlled by the control unit, a pressure sensor (9) intended to be mounted on the enclosure (8) and connected to the control unit.
EP15196344.4A 2015-11-25 2015-11-25 Method and facility for drying a vacuum enclosure Active EP3173720B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP15196344.4A EP3173720B1 (en) 2015-11-25 2015-11-25 Method and facility for drying a vacuum enclosure
US15/778,650 US20180347902A1 (en) 2015-11-25 2016-11-25 Method and system for drying an enclosure
JP2018526899A JP2018538504A (en) 2015-11-25 2016-11-25 Method and equipment for drying a vacuum chamber
PCT/EP2016/078900 WO2017089588A1 (en) 2015-11-25 2016-11-25 Method and facility for drying a vacuum chamber
EP16808941.5A EP3380799A1 (en) 2015-11-25 2016-11-25 Method and facility for drying a vacuum chamber
RU2018122773A RU2018122773A (en) 2015-11-25 2016-11-25 METHOD AND INSTALLATION FOR DRYING A CAMERA IN VACUUM

Applications Claiming Priority (1)

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EP15196344.4A EP3173720B1 (en) 2015-11-25 2015-11-25 Method and facility for drying a vacuum enclosure

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JP7316323B2 (en) * 2021-06-30 2023-07-27 株式会社Ｓｃｒｅｅｎホールディングス Vacuum drying apparatus and vacuum drying method
CN113915956A (en) * 2021-10-13 2022-01-11 大冶市兴进铝业有限公司 Section bar drying device

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WO2001088449A1 (en) * 2000-05-19 2001-11-22 Sun Tae Choi Method of drying wood and a system therefor
US20100313441A1 (en) * 2009-06-11 2010-12-16 Sterilucent, Inc. Apparatus and method for drying and sterilizing objects in a load

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JP5064119B2 (en) * 2007-06-07 2012-10-31 東京エレクトロン株式会社 Vacuuming method and storage medium
FR2920046A1 (en) * 2007-08-13 2009-02-20 Alcatel Lucent Sas METHOD FOR POST-PROCESSING A TRANSPORT MEDIUM FOR THE CONVEYAGE AND ATMOSPHERIC STORAGE OF SEMICONDUCTOR SUBSTRATES, AND POST-PROCESSING STATION FOR IMPLEMENTING SUCH A METHOD
JP5927066B2 (en) * 2012-07-05 2016-05-25 株式会社協真エンジニアリング Drying apparatus and drying method

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WO2001088449A1 (en) * 2000-05-19 2001-11-22 Sun Tae Choi Method of drying wood and a system therefor
US20100313441A1 (en) * 2009-06-11 2010-12-16 Sterilucent, Inc. Apparatus and method for drying and sterilizing objects in a load

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EP3173720B1 (en) 2019-03-13
EP3380799A1 (en) 2018-10-03
US20180347902A1 (en) 2018-12-06
RU2018122773A (en) 2019-12-25
WO2017089588A1 (en) 2017-06-01
RU2018122773A3 (en) 2019-12-25

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