EP3403037A1 - System allowing automatic extraction of cold gases in a freezer cabinet operating with a cryogenic fluid - Google Patents

System allowing automatic extraction of cold gases in a freezer cabinet operating with a cryogenic fluid

Info

Publication number
EP3403037A1
EP3403037A1 EP17702424.7A EP17702424A EP3403037A1 EP 3403037 A1 EP3403037 A1 EP 3403037A1 EP 17702424 A EP17702424 A EP 17702424A EP 3403037 A1 EP3403037 A1 EP 3403037A1
Authority
EP
European Patent Office
Prior art keywords
cabinet
extraction
enclosure
cryogenic fluid
extraction 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.)
Granted
Application number
EP17702424.7A
Other languages
German (de)
French (fr)
Other versions
EP3403037B1 (en
Inventor
Didier Pathier
Christian Reymond
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP3403037A1 publication Critical patent/EP3403037A1/en
Application granted granted Critical
Publication of EP3403037B1 publication Critical patent/EP3403037B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/042—Air treating means within refrigerated spaces
    • F25D17/045—Air flow control arrangements
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/005—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces in cold rooms
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F25D3/102—Stationary cabinets
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/12—Devices using other cold materials; Devices using cold-storage bodies using solidified gases, e.g. carbon-dioxide snow
    • F25D3/122—Stationary cabinets

Definitions

  • the present invention relates to the field of cabinets used for deep freezing or storage of food products, medical or biological, using a cryogenic gas as a cooling fluid, and it is particularly interested in the gas extraction system equipping such cabinets and that is an important element.
  • the first solution is to install a system of permanent heating of the joints so as to avoid that they go down too low in temperature and that they lose their elastic properties.
  • the joints then remain flexible and watertight longer than when they are subjected to low temperatures.
  • the leakage problem is then delayed without being removed, which can sometimes be appropriate.
  • this technique has a significant cost.
  • the second solution is to install an active extraction (fan in the extraction tube, see above), which will create a vacuum inside the cryogenic chamber.
  • an active extraction fan in the extraction tube, see above
  • the freezer then leaves no gas out in the production room and the small air inlet in the device does not disturb the freezing process to the extent that this air intake remains at a limited level.
  • an active extraction is installed.
  • the latter consists of a fan installed in the tube extraction, a power supply and a control system that triggers its operation when necessary. All this set has a significant cost in the total cost of the freezer installation and when possible, an installation without active extraction will always be preferred by the production site.
  • the present invention seeks to provide a technical solution which aims to overcome the problem of door seals cryogenic cabinets at a negligible cost.
  • the proposed solution comprises a flap (flap whose cost is negligible), located at the entrance of the extraction tube in the freezer cabinet, flap extending inwardly of the cabinet, and whose shape, the position and orientation can take advantage of the turbulence created by the fans.
  • a flap flap whose cost is negligible
  • flap flap whose cost is negligible
  • the turbulence created is partially deflected by the flap towards the extraction tube, thus pushing the gases towards the outside of the enclosure and thus creating a vacuum inside the freezing chamber.
  • This panel will be chosen according to the type of fans used in the cabinet and their direction (clockwise or counterclockwise) of operation.
  • this component must be studied to disturb as little as possible the freezing process of the cabinet (studied for example by modeling or simply by actual cabinet tests), especially to verify that the component provides the desired effect which is to create a depression inside the cabinet, that the shutter does not disturb too much the circulation of the air in the cell and that it does not degrade the heat transfer coefficient in the freezer cabinet.
  • the attached figures illustrate four embodiments of these components, depending on whether the extraction is located at the bottom or top of the freezer cabinet and that the fans turn clockwise or counterclockwise.
  • FIG. 3 illustrates an hourly operating situation of the fans, and where the extraction is located at the top of the freezer cabinet.
  • the flap positioned at the inlet of the extraction tube towards the inside of the freezing cabinet (view of the middle), at least part of the turbulence rushes into the tube inlet. extraction (right view).
  • the shutter here has a truncated cylinder shape.
  • FIG. 4 appended illustrates a counterclockwise operation situation of the fans, and where the extraction is located again at the top of the the freezer cabinet.
  • the shutter positioned at the inlet of the extraction tube towards the inside of the deep-freeze cabinet (in the middle view), at least part of the turbulence rushes into the tube inlet. extraction (right view).
  • the shutter here has a form of "bent tube”.
  • the invention relates to a cabinet used for freezing or storing food products, medical or biological, using a cryogenic fluid as a cooling fluid, cabinet type:
  • extraction system comprising an extraction tube connected to a wall of the cabinet and connecting the speaker to the outside;
  • the shutter whose shape, the position and orientation allow to divert to the extraction tube all or part of the turbulence created by said convection fan or fans.
  • the vacuum created in the enclosure is adjustable by changing the speed of the fans and can go up to 200Pa (2mbar).
  • This device performs an action comparable to that of an active extractor (fan installed in the extraction pipe) as practiced according to the prior art, but without active fan and its associated costs (the cost of the component implemented here is simply derisory).
  • This system is suitable for freezer cabinets operating with liquid nitrogen or liquid CO 2 . It will prove particularly useful for CO 2 applications because in this case, even small gas leaks often have a strong impact in the production floor and are rarely tolerable.

Abstract

The invention relates to a cabinet used for freezing or storing food, medical or biological products, using a cryogenic fluid as cooling fluid, said cabinet being of the type that is: provided with one or more convection fans located in the enclosure of the cabinet and capable of moving the air inside the cabinet and thus of contributing to the thermal exchange that occurs therein; and provided with a system for extracting the gases formed in the enclosure of the cabinet due to the vaporisation of said cryogenic fluid, said extraction system including an extraction tube (1) connecting to one wall of the cabinet and linking the enclosure to the outside; characterised in that it includes a flap (2), located on said wall, at the point where the extraction tube enters the cabinet, and extending into the cabinet, the shape, position and direction of said flap making it possible to divert all or part of the turbulence (3) created by the or said convection fans towards the extraction tube.

Description

SYSTEME PERMETTANT L'EXTRACTION AUTOMATIQUE DES GAZ FROIDS DANS UNE ARMOIRE DE SURGELATION FONCTIONNANT AVEC SYSTEM FOR THE AUTOMATIC EXTRACTION OF COLD GASES IN A FROZEN CABINET OPERATING WITH
UN FLUIDE CRYOGENIQUE La présente invention concerne le domaine des armoires utilisées pour la surgélation ou le stockage de produits alimentaires, médicaux ou biologiques, utilisant un gaz cryogénique comme fluide de refroidissement, et elle s'intéresse plus particulièrement au système d'extraction des gaz équipant de telles armoires et qui en est un élément important. The present invention relates to the field of cabinets used for deep freezing or storage of food products, medical or biological, using a cryogenic gas as a cooling fluid, and it is particularly interested in the gas extraction system equipping such cabinets and that is an important element.
En effet, on peut rappeler que lorsque l'armoire fonctionne, elle est refroidie grâce à l'injection d'un fluide cryogénique tel l'azote liquide ou le CO2 liquide à l'intérieur de l'enceinte fermée de l'appareil, ce fluide est la source de froid et son passage de l'état liquide à l'état gazeux s'accompagne d'un phénomène d'expansion du gaz. Ce gaz liquéfié se vaporise dans l'enceinte et doit ensuite être évacué de la machine vers l'extérieur du local de production. Indeed, it can be recalled that when the cabinet operates, it is cooled by the injection of a cryogenic fluid such as liquid nitrogen or liquid CO 2 inside the closed chamber of the apparatus, this fluid is the source of cold and its passage from the liquid state to the gaseous state is accompanied by a phenomenon of expansion of the gas. This liquefied gas vaporizes in the enclosure and must then be removed from the machine to the outside of the production room.
Pour ce faire, on utilise souvent un tube d'extraction (sorte de cheminée) qui relie l'enceinte à l'extérieur du bâtiment. Le gaz s'échappe alors naturellement de l'enceinte vers l'extérieur. La légère surpression créée dans l'enceinte permet de faire circuler le gaz vers l'extérieur de l'enceinte.  To do this, we often use an extraction tube (kind of chimney) that connects the enclosure to the outside of the building. The gas escapes naturally from the enclosure to the outside. The slight excess pressure created in the enclosure makes it possible to circulate the gas towards the outside of the enclosure.
Dans d'autres cas, les gaz sont mis en circulation de manière active. Sur ce tube est alors implantée une extraction active (ventilateur, turbine...) qui permet d'aspirer les gaz vers l'extérieur.  In other cases, the gases are actively circulated. On this tube is then implanted an active extraction (fan, turbine ...) that allows to suck the gas outwards.
Lorsque l'armoire est neuve et qu'elle fonctionne correctement, le système énoncé ci-dessus fonctionne très bien.  When the cabinet is new and working properly, the system stated above works very well.
En revanche, après un certain temps, les conditions de fonctionnement dérivent légèrement d'un fonctionnement idéal. En effet, on constate qu'avec le temps, les joints de la ou les porte(s) des armoires cryogéniques deviennent moins étanches car aucun matériau ne supporte les températures très basses des surgélateurs cryogéniques sans devenir à terme rigide ou cassant. Ils laissent alors passer une quantité plus ou moins grande de gaz ce qui peut dans les cas les plus extrêmes mener à une anoxie (manque d'oxygène) ou à une intoxication (gaz carbonique) des personnels présents dans le local de production. On the other hand, after a certain time, the operating conditions derive slightly from an ideal operation. Indeed, we see that over time, the joints of the door (s) cryogenic cabinets become less tight because no material can withstand the very low temperatures cryogenic freezers without eventually becoming rigid or brittle. They then let pass a greater or lesser amount of gas, which can in the most extreme cases lead to anoxia (lack of oxygen) or intoxication (carbon dioxide) of the personnel present in the production room.
Pour éviter cela, les sites sont contraints de changer les joints très souvent, ce qu'en pratique, avouons le, ils ne font pas, et les armoires de surgélation cryogéniques fonctionnent alors avec des joints imparfaits.  To avoid this, sites are forced to change joints very often, which in practice, let's face it, they do not, and cryogenic freezing cabinets then work with imperfect joints.
Lorsque les locaux de production sont convenablement ventilés on peut considérer que cette petite fuite de gaz causée par des joints imparfaits ne pose pas de problème critique, les fuites de gaz sont ventilées grâce à la ventilation du local et l'installation peut fonctionner sans risque. When the production facilities are properly ventilated, this small gas leak caused by imperfect joints is not a critical issue, the gas leaks are ventilated through the ventilation of the room and the installation can operate safely.
En revanche, lorsque la ventilation du local de production ne permet pas d'évacuer cette fuite de gaz vers l'extérieur, alors deux solutions sont utilisées de manière courante :  On the other hand, when the ventilation of the production room does not make it possible to evacuate this gas leak towards the outside, then two solutions are used in a current way:
- La première solution consiste à installer un système de chauffage permanent des joints de manière à éviter qu'ils ne descendent trop bas en température et qu'ils perdent leurs propriétés élastiques. Les joints restent alors flexibles et étanches plus longtemps que lorsqu'ils sont soumis aux basses températures. Le problème de fuite est alors retardé sans être supprimé, ce qui peut parfois convenir. Cependant cette technique a un cout non négligeable.  - The first solution is to install a system of permanent heating of the joints so as to avoid that they go down too low in temperature and that they lose their elastic properties. The joints then remain flexible and watertight longer than when they are subjected to low temperatures. The leakage problem is then delayed without being removed, which can sometimes be appropriate. However, this technique has a significant cost.
- La deuxième solution consiste à installer une extraction active (ventilateur dans le tube d'extraction, voir plus haut), qui va permettre de créer une dépression à l'intérieur de l'enceinte cryogénique. Ainsi, les fuites constatées au niveau des joints de portes ne vont plus se traduire par une sortie de gaz dans le local de production mais par une entrée d'air dans l'enceinte de surgélation. Le surgélateur ne laisse alors plus sortir de gaz dans le local de production et la petite entrée d'air dans l'appareil ne perturbe en rien le procédé de surgélation dans la mesure où cette entrée d'air reste à un niveau limité.  - The second solution is to install an active extraction (fan in the extraction tube, see above), which will create a vacuum inside the cryogenic chamber. Thus, the leaks found at the door seals will no longer result in a gas outlet in the production room but by an air inlet in the freezing chamber. The freezer then leaves no gas out in the production room and the small air inlet in the device does not disturb the freezing process to the extent that this air intake remains at a limited level.
Ainsi, pour compenser l'imperfection d'étanchéité des joints de portes et supprimer le problème de fuite de gaz qui est lié, on installe une extraction active. Cette dernière se compose d'un ventilateur installé dans le tube d'extraction, d'une alimentation électrique et d'un système de commande qui déclenche son fonctionnement lorsque cela est nécessaire. Tout cet ensemble a un cout non négligeable dans le cout total de l'installation de surgélation et lorsque cela est possible, une installation sans extraction active sera toujours préférée par le site de production. Thus, to compensate for the sealing imperfection of the door seals and to eliminate the problem of gas leakage that is linked, an active extraction is installed. The latter consists of a fan installed in the tube extraction, a power supply and a control system that triggers its operation when necessary. All this set has a significant cost in the total cost of the freezer installation and when possible, an installation without active extraction will always be preferred by the production site.
Comme on le verra plus en détails dans ce qui suit, la présente invention s'attache à proposer une solution technique qui a pour objectif de s'affranchir du problème des joints de portes des armoires cryogéniques, à un coût négligeable. As will be seen in more detail in the following, the present invention seeks to provide a technical solution which aims to overcome the problem of door seals cryogenic cabinets at a negligible cost.
Pour cela, on propose d'utiliser les ventilateurs naturellement présents dans les armoires de surgélation (la fonction première de ces ventilateurs est de brasser l'air dans l'armoire et ainsi contribuer à l'échange thermique s'y produisant) de telle sorte qu'ils continuent à réaliser cette fonction première mais qu'ils réalisent en plus une fonction d'extraction active des gaz vers l'extérieur.  For this, it is proposed to use the fans naturally present in freezer cabinets (the primary function of these fans is to stir the air in the cabinet and thus contribute to the heat exchange occurring there) so that that they continue to realize this first function but that they realize in addition a function of active extraction of gases towards the outside.
La solution proposée comporte un volet (volet dont le cout est négligeable), situé à l'entrée du tube d'extraction dans l'armoire de surgélation, volet s'étendant vers l'intérieur de l'armoire, et dont la forme, la position et l'orientation permettent de tirer partie des turbulences créées par les ventilateurs. Lorsque les ventilateurs fonctionnent, les turbulences créées sont en partie déviées par le volet vers le tube d'extraction, poussant ainsi les gaz vers l'extérieur de l'enceinte et créant ainsi une dépression à l'intérieur de l'enceinte de surgélation.  The proposed solution comprises a flap (flap whose cost is negligible), located at the entrance of the extraction tube in the freezer cabinet, flap extending inwardly of the cabinet, and whose shape, the position and orientation can take advantage of the turbulence created by the fans. When the fans are running, the turbulence created is partially deflected by the flap towards the extraction tube, thus pushing the gases towards the outside of the enclosure and thus creating a vacuum inside the freezing chamber.
La forme et l'orientation de ce volet vont être choisis en fonction du type de ventilateurs utilisés dans l'armoire et de leur sens (horaire ou antihoraire) de fonctionnement.  The shape and orientation of this panel will be chosen according to the type of fans used in the cabinet and their direction (clockwise or counterclockwise) of operation.
Par ailleurs, ce volet doit être étudié pour perturber le moins possible le processus de surgélation de l'armoire (étudié par exemple par modélisation ou encore tout simplement par des essais sur armoire réelle), notamment pour vérifier que le volet apporte l'effet recherché qui est de créer une dépression à l'intérieur de l'armoire, que le volet ne perturbe par trop la circulation de l'air dans la cellule et qu'il ne dégrade pas le coefficient de transfert thermique dans l'armoire de surgélation. Moreover, this component must be studied to disturb as little as possible the freezing process of the cabinet (studied for example by modeling or simply by actual cabinet tests), especially to verify that the component provides the desired effect which is to create a depression inside the cabinet, that the shutter does not disturb too much the circulation of the air in the cell and that it does not degrade the heat transfer coefficient in the freezer cabinet.
Les figures annexées illustrent quatre exemples de réalisation de ces volets, suivant que l'extraction est située en bas ou en haut de l'armoire de surgélation et suivant que les ventilateurs tournent dans le sens horaire ou antihoraire. The attached figures illustrate four embodiments of these components, depending on whether the extraction is located at the bottom or top of the freezer cabinet and that the fans turn clockwise or counterclockwise.
- en figure 1 annexée on constate (sur la vue de gauche , tube d'extraction non équipé d'un volet), que les turbulences créées par les ventilateurs passent devant l'entrée du tube d'extraction (situé en partie basse de l'armoire), tandis qu'alors à l'aide du volet positionné à l'entrée du tube d'extraction vers l'intérieur de l'armoire de surgélation (vue du milieu), au moins une partie des turbulences s'engouffrent dans l'entrée du tube d'extraction (vue de droite). Le volet a ici une forme de « classeur » ou « d'écope ».  - In Figure 1 attached it is found (in the left view, extraction tube not equipped with a flap), that the turbulence created by the fans pass in front of the inlet of the extraction tube (located in the lower part of the 'cabinet', while then using the shutter positioned at the entrance of the extraction tube towards the inside of the freezer cabinet (view of the middle), at least part of the turbulence rush into the inlet of the extraction tube (right view). The pane here has a form of "binder" or "scoop".
- en figure 2 annexée on constate (sur la vue de gauche , tube d'extraction non équipé d'un volet), qu'ici encore les turbulences créées par les ventilateurs passent devant l'entrée du tube d'extraction, et qu'alors à l'aide du volet positionné à l'entrée du tube d'extraction vers l'intérieur de l'armoire de surgélation (vue du milieu), au moins une partie des turbulences s'engouffrent dans l'entrée du tube d'extraction (vue de droite). Ici encore le volet a une forme de « classeur » ou « d'écope ». - In Figure 2 attached it is found (in the left view, extraction tube not equipped with a flap), that here again the turbulence created by the fans pass in front of the inlet of the extraction tube, and that then using the shutter positioned at the inlet of the extraction tube towards the inside of the freezer cabinet (view of the middle), at least a part of the turbulence engulfs in the inlet of the tube of extraction (right view). Here again the shutter has a form of "binder" or "bailer".
- la figure 3 annexée illustre une situation de fonctionnement horaire des ventilateurs, et où l'extraction est située en haut de l'armoire de surgélation. Ici encore grâce au volet positionné au niveau de l'entrée du tube d'extraction vers l'intérieur de l'armoire de surgélation (vue du milieu), au moins une partie des turbulences s'engouffrent dans l'entrée du tube d'extraction (vue de droite). Le volet a ici une forme de cylindre tronqué. - Figure 3 attached illustrates an hourly operating situation of the fans, and where the extraction is located at the top of the freezer cabinet. Here again thanks to the flap positioned at the inlet of the extraction tube towards the inside of the freezing cabinet (view of the middle), at least part of the turbulence rushes into the tube inlet. extraction (right view). The shutter here has a truncated cylinder shape.
- et la figure 4 annexée illustre une situation de fonctionnement antihoraire des ventilateurs, et où l'extraction est située à nouveau en haut de l'armoire de surgélation. Ici encore grâce au volet positionné au niveau de l'entrée du tube d'extraction vers l'intérieur de l'armoire de surgélation (vue du milieu), au moins une partie des turbulences s'engouffrent dans l'entrée du tube d'extraction (vue de droite). Le volet a ici une forme de « tube coudé ». and FIG. 4 appended illustrates a counterclockwise operation situation of the fans, and where the extraction is located again at the top of the the freezer cabinet. Here again, thanks to the shutter positioned at the inlet of the extraction tube towards the inside of the deep-freeze cabinet (in the middle view), at least part of the turbulence rushes into the tube inlet. extraction (right view). The shutter here has a form of "bent tube".
On aura bien compris que les formes des volets illustrées ici ne sont que des exemples illustratifs de l'invention, et on pourra dès lors utiliser d'autres formes, mais aussi intervertir les formes dans les cas énoncés ci- dessus (on pourra par exemple utiliser un tube coudé dans la configuration de la figure 1 ). It will be understood that the forms of the flaps illustrated here are only illustrative examples of the invention, and we can then use other forms, but also invert the forms in the cases mentioned above (we can for example use a bent tube in the configuration of Figure 1).
L'invention concerne alors une armoire utilisée pour la surgélation ou le stockage de produits alimentaires, médicaux ou biologiques, utilisant un fluide cryogénique comme fluide de refroidissement, armoire du type : The invention relates to a cabinet used for freezing or storing food products, medical or biological, using a cryogenic fluid as a cooling fluid, cabinet type:
- munie d'un ou de plusieurs ventilateurs de convection situé(s) dans l'enceinte de l'armoire et apte(s) à brasser l'air interne à l'armoire et ainsi à contribuer à l'échange thermique s'y produisant ;  - equipped with one or more convection fans located in the enclosure of the cabinet and capable of stirring the air inside the cabinet and thus contribute to the heat exchange therein producing;
- et munie d'un système d'extraction des gaz formés dans l'enceinte de l'armoire du fait de la vaporisation dudit fluide cryogénique, système d'extraction comportant un tube d'extraction se raccordant à une paroi de l'armoire et reliant l'enceinte à l'extérieur ;  - And provided with a gas extraction system formed in the enclosure of the cabinet due to the vaporization of said cryogenic fluid, extraction system comprising an extraction tube connected to a wall of the cabinet and connecting the speaker to the outside;
se caractérisant en ce qu'elle comporte un volet, situé sur ladite paroi, à l'entrée du tube d'extraction dans l'armoire, et s'étendant vers l'intérieur de l'armoire, volet dont la forme, la position et l'orientation permettent de dévier vers le tube d'extraction tout ou partie des turbulences crées par le ou lesdits ventilateurs de convection.  characterized in that it comprises a flap, located on said wall, at the inlet of the extraction tube in the cabinet, and extending towards the inside of the cabinet, the shutter whose shape, the position and orientation allow to divert to the extraction tube all or part of the turbulence created by said convection fan or fans.
Les essais menés avec un système conforme à l'un des exemples évoqués ci-dessus ont montré d'excellents résultats : The tests conducted with a system according to one of the examples mentioned above have shown excellent results:
- la dépression créée dans l'enceinte est ajustable en modifiant la vitesse des ventilateurs et peut aller jusqu'à 200Pa (2mbar). - ce dispositif réalise une action comparable à celle d'un extracteur actif (ventilateur installé dans la conduite d'extraction) tel que pratiqué selon l'art antérieur, mais sans ventilateur actif et sans ses coûts associés (le cout du volet mis en œuvre ici est tout simplement dérisoire). - The vacuum created in the enclosure is adjustable by changing the speed of the fans and can go up to 200Pa (2mbar). - This device performs an action comparable to that of an active extractor (fan installed in the extraction pipe) as practiced according to the prior art, but without active fan and its associated costs (the cost of the component implemented here is simply derisory).
- en pratique, cela permet de fonctionner en toute sécurité et quelles que soient les situations, avec des joints de porte imparfaits et sans fuite de gaz dans le local de production.  - In practice, this makes it possible to operate safely and in any situation, with imperfect door seals and no gas leakage in the production room.
- le procédé de surgélation n'est pas perturbé.  the freezing process is not disturbed.
- ce système est adapté aux armoires de surgélation fonctionnant à l'azote liquide ou au CO2 liquide. Il se révélera particulièrement utile pour les applications fonctionnant au CO2 car dans ce cas, les fuites de gaz même minimes ont souvent un impact fort dans l'atelier de production et elles sont rarement tolérables. - This system is suitable for freezer cabinets operating with liquid nitrogen or liquid CO 2 . It will prove particularly useful for CO 2 applications because in this case, even small gas leaks often have a strong impact in the production floor and are rarely tolerable.

Claims

Revendications claims
1. Armoire utilisée pour la surgélation ou le stockage de produits alimentaires, médicaux ou biologiques, utilisant un fluide cryogénique comme fluide de refroidissement, armoire du type : 1. Cabinet used for freezing or storage of food, medical or biological products, using a cryogenic fluid as a cooling fluid, cabinet of the type:
- munie d'un ou de plusieurs ventilateurs de convection situé(s) dans l'enceinte de l'armoire et apte(s) à brasser l'air interne à l'armoire et ainsi à contribuer à l'échange thermique s'y produisant ;  - equipped with one or more convection fans located in the enclosure of the cabinet and capable of stirring the air inside the cabinet and thus contribute to the heat exchange therein producing;
- et munie d'un système d'extraction des gaz formés dans l'enceinte de l'armoire du fait de la vaporisation dudit fluide cryogénique, système d'extraction comportant un tube d'extraction (1 ) se raccordant à une paroi de l'armoire et reliant l'enceinte à l'extérieur ;  - and provided with a gas extraction system formed in the enclosure of the cabinet due to the vaporization of said cryogenic fluid, extraction system comprising an extraction tube (1) connecting to a wall of the cabinet and connecting the enclosure to the outside;
se caractérisant en ce qu'elle comporte un volet (2), situé sur ladite paroi, à l'entrée du tube d'extraction dans l'armoire, et s'étendant vers l'intérieur de l'armoire, volet dont la forme, la position et l'orientation permettent de dévier vers le tube d'extraction tout ou partie des turbulences (3) crées par le ou lesdits ventilateurs de convection.  characterized in that it comprises a flap (2), located on said wall, at the inlet of the extraction tube in the cabinet, and extending towards the inside of the cabinet, the shutter whose shape , the position and the orientation allow to divert to the extraction tube all or part of the turbulence (3) created by the convection fan or fans.
EP17702424.7A 2016-01-13 2017-01-10 System allowing automatic extraction of cold gases in a freezer cabinet operating with a cryogenic fluid Active EP3403037B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1650248A FR3046668B1 (en) 2016-01-13 2016-01-13 SYSTEM FOR THE AUTOMATIC EXTRACTION OF COLD GASES IN A FROZEN CONTROL CABIN OPERATING WITH A CRYOGENIC FLUID
PCT/FR2017/050050 WO2017121951A1 (en) 2016-01-13 2017-01-10 System allowing automatic extraction of cold gases in a freezer cabinet operating with a cryogenic fluid

Publications (2)

Publication Number Publication Date
EP3403037A1 true EP3403037A1 (en) 2018-11-21
EP3403037B1 EP3403037B1 (en) 2023-10-18

Family

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Application Number Title Priority Date Filing Date
EP17702424.7A Active EP3403037B1 (en) 2016-01-13 2017-01-10 System allowing automatic extraction of cold gases in a freezer cabinet operating with a cryogenic fluid

Country Status (6)

Country Link
US (1) US20190017738A1 (en)
EP (1) EP3403037B1 (en)
ES (1) ES2965038T3 (en)
FR (1) FR3046668B1 (en)
PT (1) PT3403037T (en)
WO (1) WO2017121951A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1654343A (en) * 1924-11-24 1927-12-27 Charles A Moore Precooling structure
US1832874A (en) * 1930-03-19 1931-11-24 Charles A Moore Air conditioning device for cold storage rooms
US4344291A (en) * 1980-04-28 1982-08-17 Liquid Carbonic Corporation Cryogenic cabinet freezer
JPH0112150Y2 (en) * 1985-11-06 1989-04-10
FR2979697B1 (en) * 2011-09-07 2013-09-27 Air Liquide SYSTEM FOR ENHANCING THE BALANCING OF COLD GASES IN A FREEZING TUNNEL BY IMPLEMENTING BUFFER ZONES AND INTERNAL SHUTTERS

Also Published As

Publication number Publication date
FR3046668A1 (en) 2017-07-14
ES2965038T3 (en) 2024-04-10
US20190017738A1 (en) 2019-01-17
FR3046668B1 (en) 2018-02-16
EP3403037B1 (en) 2023-10-18
WO2017121951A1 (en) 2017-07-20
PT3403037T (en) 2023-12-07

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