EP0957732A1 - Open horizontal refrigerated display cabinet for frozen or refrigerated food - Google Patents

Open horizontal refrigerated display cabinet for frozen or refrigerated food

Info

Publication number
EP0957732A1
EP0957732A1 EP96937385A EP96937385A EP0957732A1 EP 0957732 A1 EP0957732 A1 EP 0957732A1 EP 96937385 A EP96937385 A EP 96937385A EP 96937385 A EP96937385 A EP 96937385A EP 0957732 A1 EP0957732 A1 EP 0957732A1
Authority
EP
European Patent Office
Prior art keywords
air
deflector
cold air
flow
cold
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
EP96937385A
Other languages
German (de)
French (fr)
Other versions
EP0957732B1 (en
Inventor
Christian Morillon
François Penot
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0957732A1 publication Critical patent/EP0957732A1/en
Application granted granted Critical
Publication of EP0957732B1 publication Critical patent/EP0957732B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0439—Cases or cabinets of the open type
    • A47F3/0443—Cases or cabinets of the open type with forced air circulation

Definitions

  • the present invention relates to a horizontal and open sales refrigeration unit, intended for frozen or refrigerated products.
  • both horizontal and vertical refrigeration cabinets tend to be open, that is, without a cover or protective door, to facilitate and encourage the spontaneous purchase of food by consumers.
  • the foodstuffs are directly exposed to the ambient air which is generally at a temperature of about 25-30 ° C and are subjected to infrared radiation from the external environment which heats them.
  • These refrigeration units have a main cold air circuit to form one or more curtains of cold air on the exposed surface of frozen or refrigerated products, in order to keep them in a satisfactory state.
  • cold air has generally been blown on the exposed surface of the foodstuffs at a temperature of, for example, between -28 and -30 ° C and at a speed of about 0.8- 1 m / s for example, to extract by forced convection the heat absorbed by radiation by foodstuffs.
  • the cold air curtain blows little with the ambient air, thus minimizing the heating of the cold air curtain by convective heat transfer with the ambient air, which reduces the amount of energy that must supply the main circuit evaporator for each refrigeration cycle,
  • the small amount of air mixed above the curtain of cold air is weakly entrained by the circulation of the cold air flow and remains confined in the cabinet due to its low speed, thus forming a "bathtub" filled with relatively cooler air than ambient air, which reduces heat transfer with the air curtain.
  • the aforementioned bathtub is generally materialized by the side walls of the refrigerating cabinet which protrude by a certain height from the surface of the foodstuffs.
  • the present invention therefore aims to eliminate the aforementioned drawbacks and to provide a horizontal and open refrigerated sales cabinet, intended for frozen or refrigerated products, ensuring optimum refrigeration of the latter while limiting energy expenditure and despite higher cold air flow rates.
  • the subject of the present invention is a horizontal and open refrigerated sales cabinet, intended for frozen or refrigerated foodstuffs, of the type comprising a main cold air circuit having nozzles for blowing cold air at a higher speed. , for example of the order of 2 m / s, to form at least one curtain of cold air on the surface of the products which are exposed to ambient air and a return of this cold air, characterized in that comprises a deflector at the level of the cold air return to return a flow of mixed air relatively cooler than the ambient air in the opposite direction above the aforementioned curtain of cold air, forming a loop of relatively mixed air cold intermediate between the curtain of cold air and the ambient air, which reconstitutes the "bathtub" effect mentioned above.
  • the deflector has in section a substantially U-shaped shape whose opening is oriented towards the interior of the cabinet.
  • the deflector has a substantially flattened C or chistera shape in section, the opening of which is oriented towards the inside of the cabinet, the deflector then also having the function of partially shielding infrared radiation.
  • the upper part of the deflector is equipped with an internal lining and spaced therefrom, said lining defining with said upper part of the deflector a divergent channel or with increasing section in the opposite direction to the flow of cold air flow, which slows down the flow speed of the surface layer of mixed air in the bathtub and thus reduces turbulence at the interface between ambient air and the above-mentioned intermediate air loop .
  • the lower part of the deflector is equipped with a separator to separate the flow of air sucked in by the main circuit from the flow of mixed air returned in the opposite direction in the cabinet, which reduces thus the turbulence at the level of the separation zone of the two flows.
  • the separator is a plate curved in the direction of the flow of mixed air entering the deflector, said plate being spaced from the lower part of the deflector to define a secondary passage with the air intake.
  • the separator is a plate curved in the direction of the flow of cold air drawn in by the main circuit, said plate being spaced from the lower part of the deflector to define a secondary passage with the air intake.
  • the glazing may functionally be part of the aforementioned deflector.
  • a vertical panel can be mounted above the above-mentioned deflector to form a second bathtub above the above-mentioned intermediate loop.
  • the furniture of the invention comprises a structure with multiple layers of air, more and more cold, starting for example from a layer of surface air slowed down to the main curtain of cold air , passing through the mixed cooler intermediate air loop.
  • Figure 1 is a schematic view, in vertical section and in elevation of a refrigeration unit according to one invention.
  • Figure 2 is a schematic view in vertical section of the upper part of another embodiment of the furniture of the invention.
  • Figure 3 is a schematic view in vertical section of the air return portion of yet another embodiment of the furniture of the invention.
  • Figures 4 and 5 are views similar to Figure 3, but showing alternative embodiments in which the separator is respectively curved upward and downward.
  • Figures 6 to 8 show the same deflector as that of Figure 4, on which is mounted respectively a vertical panel, a transparent horizontal plate and the combined assembly of the panel and the plate.
  • the refrigerated display cabinet of the invention comprises a box 1 with a double wall containing an insulator 2, by example made of polyurethane, and having for example a substantially elongated shape and open upwards- defining a horizontal upper opening 3.
  • an insulator 2 by example made of polyurethane, and having for example a substantially elongated shape and open upwards- defining a horizontal upper opening 3.
  • a tank 4 for storing frozen or refrigerated products 5 (shown diagrammatically in FIGS. 2 to 8) is mounted inside the box 1, so that a sheath 6 for the main circulation of recycled cold air is defined between the internal wall of the box 1 and the external wall of the tank 4.
  • a suction fan 7 and an evaporator 8 are mounted through the sheath 6, the evaporator being supplied with refrigerant.
  • the above-mentioned sheath 6 opens at the upper opening 3 into blowing nozzles 9 which produce at least one curtain of cold air R on the surface of the tank 4.
  • the heat absorbed by the food by radiation from the ambient environment is extracted from it by forced convection between the surface of the frozen or refrigerated food contained in the tank 4 and the curtain of cold air R.
  • the curtain of cold air R is recycled into the sheath 6 by suction at an air intake 10.
  • the upper part of the box 1 at the level of the cold air intake 10 here consists of triple vertical transparent glazing 11 to facilitate the viewing of the food by the consumer.
  • the innermost glazing of the aforementioned triple glazing 11 is functionally part of the deflector Dl of the invention which here comprises an upper wall 12 equipped with an internal lining 13, and a separation plate 14 in the form of a longitudinal fin and curved downwards or in the direction of the cold air intake, in the vicinity of the glazing 11.
  • the profiled fin 14 promotes the directional flow of the curtain of cold air R towards the main circuit 6 and of the mixed air flow entrained by the turbulent flow of the curtain R towards the deflector Dl to cause it to return in the opposite direction to the - above curtain R, following loop B.
  • the lining 13 which is in the form of a sheet metal curved downwards and towards the glazing 11, is spaced therefrom to define a divergent channel C or with increasing section through which a layer d superficial mixed air S whose speed is low to reduce turbulence at the interface with the external ambient air.
  • the curved end of the separation fin 14 is also spaced from the glazing 11 to define a secondary passage Pi towards the main circuit 6.
  • this secondary passage PI facilitates the separation of the flow of cold air and of mixed air at the level of the return air.
  • the T-shaped floor is shown in FIG. 1 to define the orientation of the aforementioned panoramic sales refrigeration unit.
  • FIG. 2 schematically shows the upper part of another embodiment of the furniture of the invention.
  • the deflector D2 has in vertical section perpendicular to the longitudinal extension of the piece of furniture, a substantially flattened C or chistera shape, the opening of which is oriented towards the inside of the piece of furniture.
  • the deflector D2 here extends over a large part of the upper opening 3 of the box 1 to partially protect the foodstuffs 5 from infrared radiation, while in FIG. 1, the deflector Dl is clearly smaller and confined at the level of the air intake.
  • the deflector D2 here has neither separator nor lining.
  • the deflector D2 could alternatively be much smaller and confined to the level of the air intake zone 10.
  • FIG. 3 partially represents yet another embodiment of the cabinet of the invention, in which the deflector D3 has a substantially U-shaped shape, the opening of which is oriented towards the interior of the cabinet.
  • the deflector D3 here has a larger size than the deflector Dl of FIG. 1 and is distinguished from the latter in particular by the fact that the separator 15 is here a plate ensuring a continuous connection both with the internal wall of the deflector D3 and with the inner wall of the box 1, so that the aforementioned passage PI is here deleted.
  • FIG. 4 represents a variant of the embodiment represented in FIG. 3, in which the separator 16 is a plate in the shape of a profiled fin curved upwards in the direction of the flow of mixed air B.
  • the curved end of the fin 16 is spaced here from the lower part of the deflector D3 to define a secondary passage P2 communicating with the main circuit 6.
  • FIG. 5 represents a variant of FIG. 3, in which the separator 14 has a shape substantially identical to that of FIG. 1.
  • Figure 7 is similar to Figure 6, except that the panel 17 has been removed and replaced by a horizontal transparent plate, for example glass or plastic such as polymethacrylate, fixed on the deflector D3 in the plane of its upper wall 12 , to facilitate the visualization of food 5.
  • a horizontal transparent plate for example glass or plastic such as polymethacrylate
  • FIG. 8 groups together the variants of FIGS. 6 and 7, with the panel 17 mounted on the aforementioned plate 18.
  • the flows of cold or relatively cold air with respect to the ambient air define a stratified structure or with a multiple layer of air ensuring minimal energy loss at the opening 3.

Abstract

An open horizontal refrigerated display cabinet comprising a main cold air system (6) with higher-speed blow nozzles (9), e.g. with a flow rate of around 2 m/s, for forming a cold air curtain (R), and a baffle (D1) arranged at the cold air recirculation point (10) for reversing the direction of a mixed air flow having a lower temperature than the ambient air so that it flows back over said cold air curtain and thus forms an intermediate mixed air loop (B). Said display cabinet is particularly suitable for frozen or refrigerated food.

Description

"Meuble frigorifique de vente horizontal et ouvert, destiné aux denrées surgelées ou réfrigérées"."Horizontal and open refrigerated display cabinet, intended for frozen or refrigerated products".
La présente invention concerne un meuble frigorifique de vente horizontal et ouvert, destiné aux denrées surgelées ou réfrigérées.The present invention relates to a horizontal and open sales refrigeration unit, intended for frozen or refrigerated products.
Actuellement, les meubles frigorifiques horizontaux comme verticaux ont tendance à être ouverts, c'est-à-dire sans couvercle ou porte de protection, pour faciliter et inciter l'achat spontané des denrées alimentaires par des consommateurs.Currently, both horizontal and vertical refrigeration cabinets tend to be open, that is, without a cover or protective door, to facilitate and encourage the spontaneous purchase of food by consumers.
Dans de tels meubles frigorifiques ouverts, les denrées alimentaires sont directement exposées à l'air ambiant qui est généralement à une température d'environ 25-30°C et sont soumises au rayonnement infrarouge de l'environnement extérieur qui les réchauffe.In such open refrigerated cabinets, the foodstuffs are directly exposed to the ambient air which is generally at a temperature of about 25-30 ° C and are subjected to infrared radiation from the external environment which heats them.
Ces meubles frigorifiques comportent un circuit principal d'air froid pour former un ou plusieurs rideaux d'air froid à la surface exposée des denrées surgelées ou réfrigérées, afin de les conserver dans un état satisfaisant.These refrigeration units have a main cold air circuit to form one or more curtains of cold air on the exposed surface of frozen or refrigerated products, in order to keep them in a satisfactory state.
Jusqu'à présent, pour conserver les denrées surgelées, on soufflait généralement de l'air froid à la surface exposée des denrées à une température comprise par exemple entre - 28 et -30°C et à une vitesse d'environ 0,8-1 m/s par exemple, pour extraire par convection forcée la chaleur absorbée par rayonnement par les denrées.Until now, in order to keep frozen foodstuffs, cold air has generally been blown on the exposed surface of the foodstuffs at a temperature of, for example, between -28 and -30 ° C and at a speed of about 0.8- 1 m / s for example, to extract by forced convection the heat absorbed by radiation by foodstuffs.
A cette vitesse, l'écoulement d'air froid à la surface des denrées est laminaire et donc peu de turbulences se produisent à l'interface entre le rideau d'air froid et l'air ambiant, de sorte que :At this speed, the flow of cold air on the surface of the foodstuffs is laminar and therefore little turbulence occurs at the interface between the curtain of cold air and the ambient air, so that:
- le rideau d'air froid soufflé se mélange peu avec l'air ambiant, minimisant ainsi le réchauffement du rideau d'air froid par transfert convectif de chaleur avec l'air ambiant, ce qui réduit la quantité d'énergie que doit fournir l'évaporateur du circuit principal, à chaque cycle de réfrigération,- the cold air curtain blows little with the ambient air, thus minimizing the heating of the cold air curtain by convective heat transfer with the ambient air, which reduces the amount of energy that must supply the main circuit evaporator for each refrigeration cycle,
- la faible quantité d'air mélangé au-dessus du rideau d'air froid est faiblement entraînée par la circulation du flux d'air froid et reste confinée dans le meuble du fait de sa faible vitesse, formant ainsi une "baignoire" remplie d'air relativement plus froid que l'air ambiant, ce qui réduit le transfert de chaleur avec le rideau d'air.- the small amount of air mixed above the curtain of cold air is weakly entrained by the circulation of the cold air flow and remains confined in the cabinet due to its low speed, thus forming a "bathtub" filled with relatively cooler air than ambient air, which reduces heat transfer with the air curtain.
La baignoire précitée est généralement matérialisée par les parois latérales du meuble frigorifique qui dépassent d'une certaine hauteur la surface des denrées.The aforementioned bathtub is generally materialized by the side walls of the refrigerating cabinet which protrude by a certain height from the surface of the foodstuffs.
Toutefois, pour atteindre des températures plus basses, de l'ordre de -18°C au coeur des denrées, comme cela est désormais exigé pour les aliments surgelés, il peut être nécessaire d'augmenter la vitesse d'écoulement du rideau d'air froid, par exemple à une vitesse de soufflage de l'ordre de 2-2,5 m/s.However, to reach lower temperatures, of the order of -18 ° C in the core of foodstuffs, as is now required for frozen food, it may be necessary to increase the speed of flow of the air curtain cold, for example at a blowing speed of the order of 2-2.5 m / s.
A cette vitesse, l'écoulement d'air froid passe du régime laminaire au régime turbulent, ce qui a les conséquences suivantes :At this speed, the flow of cold air changes from the laminar regime to the turbulent regime, which has the following consequences:
- l'air ambiant se mélange beaucoup plus avec le flux d'air froid, ce qui provoque un réchauffement nettement plus important de ce dernier et nécessite donc plus d'énergie pour le refroidir à chaque cycle dans l'évaporateur,- the ambient air mixes much more with the cold air flow, which causes a much greater heating of the latter and therefore requires more energy to cool it each cycle in the evaporator,
- la grande quantité d'air mélangé située au-dessus du rideau d'air froid est entraînée par la circulation du flux d'air froid à une vitesse trop élevée pour que l'air ainsi mélangé reste confiné dans le meuble et s'en échappe donc, supprimant l'effet "baignoire".- the large quantity of mixed air located above the curtain of cold air is caused by the circulation of the cold air flow at a speed too high for the air thus mixed to remain confined in the cabinet and therefore escapes, eliminating the "bathtub" effect.
La solution consistant à élever encore la hauteur des parois latérales du meuble frigorifique n'est pas acceptable car les denrées deviendraient alors inaccessibles au consommateur. Bien entendu, le même problème peut se poser pour les denrées simplement réfrigérées à une température d'environ +4°C pour des produits sensibles tels que la viande et +8°C pour les produits tels que les laitages, si l'on souhaite augmenter la vitesse d'écoulement du flux d'air froid.The solution of further raising the height of the side walls of the refrigeration unit is not acceptable because the food would then become inaccessible to the consumer. Of course, the same problem can arise for foodstuffs that are simply refrigerated at a temperature of around + 4 ° C for sensitive products such as meat and + 8 ° C for products such as dairy products, if one wishes increase the flow speed of the cold air flow.
La présente invention a donc pour but d'éliminer les inconvénients précités et de proposer un meuble frigorifique de vente horizontal et ouvert, destiné aux denrées surgelées ou réfrigérées, assurant une réfrigération optimale de ces dernières tout en limitant la dépense d'énergie et malgré des vitesses d'écoulement du flux d'air froid plus élevées.The present invention therefore aims to eliminate the aforementioned drawbacks and to provide a horizontal and open refrigerated sales cabinet, intended for frozen or refrigerated products, ensuring optimum refrigeration of the latter while limiting energy expenditure and despite higher cold air flow rates.
A cet effet, la présente invention a pour objet un meuble frigorifique de vente horizontal et ouvert, destiné aux denrées surgelées ou réfrigérées, du type comportant un circuit principal d'air froid ayant des buses de soufflage d'air froid à une vitesse plus élevée, par exemple de l'ordre de 2 m/s, pour former au moins un rideau d'air froid à la surface des denrées qui sont exposées à l'air ambiant et une reprise de cet air froid, caractérisé en ce qu'il comporte un déflecteur au niveau de la reprise d'air froid pour retourner un flux d'air mélangé relativement plus froid que l'air ambiant en sens inverse au-dessus du rideau d'air froid précité, formant une boucle d'air mélangé relativement froid intermédiaire entre le rideau d'air froid et l'air ambiant, ce qui reconstitue l'effet "baignoire" précité.To this end, the subject of the present invention is a horizontal and open refrigerated sales cabinet, intended for frozen or refrigerated foodstuffs, of the type comprising a main cold air circuit having nozzles for blowing cold air at a higher speed. , for example of the order of 2 m / s, to form at least one curtain of cold air on the surface of the products which are exposed to ambient air and a return of this cold air, characterized in that comprises a deflector at the level of the cold air return to return a flow of mixed air relatively cooler than the ambient air in the opposite direction above the aforementioned curtain of cold air, forming a loop of relatively mixed air cold intermediate between the curtain of cold air and the ambient air, which reconstitutes the "bathtub" effect mentioned above.
Dans une variante de réalisation, le déflecteur a en section une forme sensiblement en U couché dont l'ouverture est orientée vers l'intérieur du meuble.In an alternative embodiment, the deflector has in section a substantially U-shaped shape whose opening is oriented towards the interior of the cabinet.
Selon une autre variante de réalisation, le déflecteur a en section une forme sensiblement en C aplati ou en chistera dont l'ouverture est orientée vers l'intérieur du meuble, le déflecteur pouvant alors également avoir pour fonction de faire partiellement écran au rayonnement infrarouge. Selon une autre caractéristique de l'invention, la partie supérieure du déflecteur est équipée d'une doublure interne et espacée de celle-ci, ladite doublure définissant avec ladite partie supérieure du déflecteur un canal divergent ou à section croissante dans le sens contraire à l'écoulement du flux d'air froid, ce qui ralentit la vitesse d'écoulement de la couche superficielle d'air mélangé dans la baignoire et réduit ainsi les turbulences à l'interface entre l'air ambiant et la boucle d'air intermédiaire précitée.According to another alternative embodiment, the deflector has a substantially flattened C or chistera shape in section, the opening of which is oriented towards the inside of the cabinet, the deflector then also having the function of partially shielding infrared radiation. According to another characteristic of the invention, the upper part of the deflector is equipped with an internal lining and spaced therefrom, said lining defining with said upper part of the deflector a divergent channel or with increasing section in the opposite direction to the flow of cold air flow, which slows down the flow speed of the surface layer of mixed air in the bathtub and thus reduces turbulence at the interface between ambient air and the above-mentioned intermediate air loop .
Selon encore une autre caractéristique de l'invention, la partie inférieure du déflecteur est équipée d'un séparateur pour séparer le flux d'air aspiré par le circuit principal du flux d'air mélangé retourné en sens inverse dans le meuble, ce qui atténue ainsi les turbulences au niveau de la zone de séparation des deux écoulements.According to yet another characteristic of the invention, the lower part of the deflector is equipped with a separator to separate the flow of air sucked in by the main circuit from the flow of mixed air returned in the opposite direction in the cabinet, which reduces thus the turbulence at the level of the separation zone of the two flows.
Dans un mode de réalisation particulier, le séparateur est une plaque courbée en direction du flux d'air mélangé entrant dans le déflecteur, ladite plaque étant espacée de la partie inférieure du déflecteur pour définir un passage secondaire avec la reprise d'air.In a particular embodiment, the separator is a plate curved in the direction of the flow of mixed air entering the deflector, said plate being spaced from the lower part of the deflector to define a secondary passage with the air intake.
Dans un autre mode de réalisation, le séparateur est une plaque courbée en direction du flux d'air froid aspiré par le circuit principal, ladite plaque étant espacée de la partie inférieure du déflecteur pour définir un passage secondaire avec la reprise d'air.In another embodiment, the separator is a plate curved in the direction of the flow of cold air drawn in by the main circuit, said plate being spaced from the lower part of the deflector to define a secondary passage with the air intake.
Lorsque le meuble frigorifique est équipé d'un vitrage vertical au niveau de la reprise d'air, le vitrage peut faire fonctionnellement partie du déflecteur précité.When the refrigeration unit is fitted with vertical glazing at the air intake level, the glazing may functionally be part of the aforementioned deflector.
Selon encore une autre caractéristique de l'invention, on peut monter un panneau vertical au-dessus du déflecteur précité pour former une seconde baignoire au-dessus de la boucle intermédiaire précitée. On voit ainsi que le meuble de l'invention comporte une structure à couches d'air multiples, de pl-us en plus froide, en partant par exemple d'une couche d'air superficielle ralentie jusqu'au rideau d'air froid principal, en passant par la boucle d'air mélangé relativement plus froid intermédiaire.According to yet another characteristic of the invention, a vertical panel can be mounted above the above-mentioned deflector to form a second bathtub above the above-mentioned intermediate loop. It can thus be seen that the furniture of the invention comprises a structure with multiple layers of air, more and more cold, starting for example from a layer of surface air slowed down to the main curtain of cold air , passing through the mixed cooler intermediate air loop.
L'invention sera mieux comprise, et d'autres buts, caractéristiques et détails de l'invention apparaîtront plus clairement au cours de la description explicative qui va suivre de plusieurs modes de réalisation actuellement préférés de l'invention, donnés uniquement à titre illustratif et non limitatif en référence aux dessins schématiques annexés, dans lesquels :The invention will be better understood, and other objects, characteristics and details of the invention will appear more clearly during the explanatory description which will follow of several currently preferred embodiments of the invention, given solely by way of illustration and nonlimiting with reference to the appended schematic drawings, in which:
La figure 1 est une vue schématique, en coupe verticale et en élévation d'un meuble frigorifique conforme à 1 'invention.Figure 1 is a schematic view, in vertical section and in elevation of a refrigeration unit according to one invention.
La figure 2 est une vue schématique et en coupe verticale de la partie supérieure d'un autre mode de réalisation du meuble de l'invention.Figure 2 is a schematic view in vertical section of the upper part of another embodiment of the furniture of the invention.
La figure 3 est une vue schématique et en coupe verticale de la partie de reprise d'air d'encore un autre mode de réalisation du meuble de l'invention.Figure 3 is a schematic view in vertical section of the air return portion of yet another embodiment of the furniture of the invention.
Les figures 4 et 5 sont des vues analogues à la figure 3, mais représentant des variantes de réalisation dans lesquelles le séparateur est respectivement recourbé vers le haut et vers le bas.Figures 4 and 5 are views similar to Figure 3, but showing alternative embodiments in which the separator is respectively curved upward and downward.
Les figures 6 à 8 représentent le même déflecteur que celui de la figure 4, sur lequel est monté respectivement un panneau vertical, une plaque transparente horizontale et l'ensemble combiné du panneau et de la plaque.Figures 6 to 8 show the same deflector as that of Figure 4, on which is mounted respectively a vertical panel, a transparent horizontal plate and the combined assembly of the panel and the plate.
Suivant l'exemple de réalisation représenté sur la figureAccording to the embodiment shown in the figure
1, le meuble frigorifique de vente de l'invention comporte un caisson 1 à double paroi renfermant un isolant 2, par exemple en polyuréthane, et ayant par exemple une forme sensiblement allongée et ouverte vers le haut- définissant une ouverture supérieure horizontale 3.1, the refrigerated display cabinet of the invention comprises a box 1 with a double wall containing an insulator 2, by example made of polyurethane, and having for example a substantially elongated shape and open upwards- defining a horizontal upper opening 3.
Un bac 4 pour le stockage de produits surgelés ou réfrigérés 5 (montrés schematiquement sur les figures 2 à 8) est monté à l'intérieur du caisson 1, de sorte qu'une gaine 6 de circulation principale d'air froid recyclé soit définie entre la paroi interne du caisson 1 et la paroi externe du bac 4.A tank 4 for storing frozen or refrigerated products 5 (shown diagrammatically in FIGS. 2 to 8) is mounted inside the box 1, so that a sheath 6 for the main circulation of recycled cold air is defined between the internal wall of the box 1 and the external wall of the tank 4.
Un ventilateur d'aspiration 7 et un évaporateur 8 sont montés à travers la gaine 6, l'évaporateur étant alimenté en fluide frigorigène.A suction fan 7 and an evaporator 8 are mounted through the sheath 6, the evaporator being supplied with refrigerant.
On peut bien entendu prévoir plusieurs ventilateurs ou évaporateurs dans le circuit principal d'air froid.It is of course possible to provide several fans or evaporators in the main cold air circuit.
La gaine 6 précitée débouche au niveau de l'ouverture supérieure 3 dans des buses de soufflage 9 qui produisent au moins un rideau d'air froid R à la surface du bac 4.The above-mentioned sheath 6 opens at the upper opening 3 into blowing nozzles 9 which produce at least one curtain of cold air R on the surface of the tank 4.
La chaleur absorbée par les denrées par rayonnement de l'environnement ambiant est extraite de celles-ci par convection forcée entre la surface des denrées surgelées ou réfrigérées contenues dans le bac 4 et le rideau d'air froid R.The heat absorbed by the food by radiation from the ambient environment is extracted from it by forced convection between the surface of the frozen or refrigerated food contained in the tank 4 and the curtain of cold air R.
Le rideau d'air froid R est recyclé dans la gaine 6 par aspiration au niveau d'une reprise d'air 10.The curtain of cold air R is recycled into the sheath 6 by suction at an air intake 10.
Dans l'exemple particulier de réalisation de la figure 1, la partie supérieure du caisson 1 au niveau de la reprise d'air froid 10 est constituée ici d'un triple vitrage transparent vertical 11 pour faciliter la visualisation des denrées par le consommateur.In the particular embodiment of FIG. 1, the upper part of the box 1 at the level of the cold air intake 10 here consists of triple vertical transparent glazing 11 to facilitate the viewing of the food by the consumer.
Le vitrage le plus interne du triple vitrage 11 précité fait fonctionnellement partie du déflecteur Dl de l'invention qui comprend ici une paroi supérieure 12 équipée d'une doublure interne 13, et une plaque de séparation 14 en forme d'ailette longitudinale et recourbée vers le bas ou dans le sens de l'aspiration de l'air froid, au voisinage du vitrage 11.The innermost glazing of the aforementioned triple glazing 11 is functionally part of the deflector Dl of the invention which here comprises an upper wall 12 equipped with an internal lining 13, and a separation plate 14 in the form of a longitudinal fin and curved downwards or in the direction of the cold air intake, in the vicinity of the glazing 11.
L'ailette profilée 14 favorise l'écoulement directionnel du rideau d'air froid R vers le circuit principal 6 et du flux d'air mélangé entraîné par l'écoulement turbulent du rideau R vers le déflecteur Dl pour le faire retourner en sens inverse au-dessus du rideau R, suivant la boucle B.The profiled fin 14 promotes the directional flow of the curtain of cold air R towards the main circuit 6 and of the mixed air flow entrained by the turbulent flow of the curtain R towards the deflector Dl to cause it to return in the opposite direction to the - above curtain R, following loop B.
On voit toujours sur la figure 1 que la doublure 13 qui est en forme de tôle recourbée vers le bas et vers le vitrage 11, est espacée de celui-ci pour définir un canal C divergent ou à section croissante à travers lequel passe une couche d'air mélangé superficielle S dont la vitesse est faible pour réduire les turbulences à l'interface avec l'air ambiant externe.We always see in Figure 1 that the lining 13 which is in the form of a sheet metal curved downwards and towards the glazing 11, is spaced therefrom to define a divergent channel C or with increasing section through which a layer d superficial mixed air S whose speed is low to reduce turbulence at the interface with the external ambient air.
L'extrémité recourbée de l'ailette de séparation 14 est également espacée du vitrage 11 pour définir un passage secondaire Pi vers le circuit principal 6.The curved end of the separation fin 14 is also spaced from the glazing 11 to define a secondary passage Pi towards the main circuit 6.
La présence de ce passage secondaire PI facilite la séparation de l'écoulement d'air froid et d'air mélangé au niveau de la reprise d'air.The presence of this secondary passage PI facilitates the separation of the flow of cold air and of mixed air at the level of the return air.
On a indiqué sur la figure 1 le sol en T pour définir l'orientation du meuble frigorifique de vente panoramique précité.The T-shaped floor is shown in FIG. 1 to define the orientation of the aforementioned panoramic sales refrigeration unit.
On a représenté schematiquement sur la figure 2 la partie supérieure d'un autre mode de réalisation du meuble de l'invention.FIG. 2 schematically shows the upper part of another embodiment of the furniture of the invention.
Dans ce mode de réalisation, le déflecteur D2 a en section verticale perpendiculaire à l'extension longitudinale du meuble, une forme sensiblement en C aplati ou en chistera dont l'ouverture est orientée vers l'intérieur du meuble. Le déflecteur D2 s'étend ici sur une grande partie de l'ouverture supérieure 3 du caisson 1 pour protéger partiellement les denrées 5 du rayonnement infrarouge, alors que dans la figure 1, le déflecteur Dl est nettement plus petit et confiné au niveau de la reprise d'air.In this embodiment, the deflector D2 has in vertical section perpendicular to the longitudinal extension of the piece of furniture, a substantially flattened C or chistera shape, the opening of which is oriented towards the inside of the piece of furniture. The deflector D2 here extends over a large part of the upper opening 3 of the box 1 to partially protect the foodstuffs 5 from infrared radiation, while in FIG. 1, the deflector Dl is clearly smaller and confined at the level of the air intake.
Le déflecteur D2 ne comporte ici ni séparateur ni doublure.The deflector D2 here has neither separator nor lining.
Bien entendu, le déflecteur D2 pourrait en variante être beaucoup plus petit et confiné au niveau de la zone de reprise d'air 10.Of course, the deflector D2 could alternatively be much smaller and confined to the level of the air intake zone 10.
La figure 3 représente partiellement encore un autre mode de réalisation du meuble de l'invention, dans lequel le déflecteur D3 présente une forme sensiblement en U couché dont l'ouverture est orientée vers l'intérieur du meuble.FIG. 3 partially represents yet another embodiment of the cabinet of the invention, in which the deflector D3 has a substantially U-shaped shape, the opening of which is oriented towards the interior of the cabinet.
Le déflecteur D3 a ici une taille plus grande que le déflecteur Dl de la figure 1 et se distingue de ce dernier notamment par le fait que le séparateur 15 est ici une plaque assurant une liaison continue à la fois avec la paroi interne du déflecteur D3 et avec la paroi interne du caisson 1, de sorte que le passage PI précité est ici supprimé.The deflector D3 here has a larger size than the deflector Dl of FIG. 1 and is distinguished from the latter in particular by the fact that the separator 15 is here a plate ensuring a continuous connection both with the internal wall of the deflector D3 and with the inner wall of the box 1, so that the aforementioned passage PI is here deleted.
La figure 4 représente une variante du mode de réalisation représenté sur la figure 3, dans laquelle le séparateur 16 est une plaque en forme d'ailette profilée recourbée vers le haut en direction du flux d'air mélangé B.FIG. 4 represents a variant of the embodiment represented in FIG. 3, in which the separator 16 is a plate in the shape of a profiled fin curved upwards in the direction of the flow of mixed air B.
L'extrémité recourbée de l'ailette 16 est espacée ici de la partie inférieure du déflecteur D3 pour définir un passage secondaire P2 communiquant avec le circuit principal 6.The curved end of the fin 16 is spaced here from the lower part of the deflector D3 to define a secondary passage P2 communicating with the main circuit 6.
La figure 5 représente une variante de la figure 3, dans laquelle le séparateur 14 a une forme sensiblement identique à celui de la figure 1.FIG. 5 represents a variant of FIG. 3, in which the separator 14 has a shape substantially identical to that of FIG. 1.
Sur la figure 6, on a représenté le déflecteur D3 de la figure 4 sur la paroi supérieure 12 duquel est monté un panneau vertical 17 qui est destiné à créer une seconde "baignoire" au-dessus de la boucle intermédiaire B précitée.In Figure 6, there is shown the deflector D3 of Figure 4 on the upper wall 12 of which is mounted a vertical panel 17 which is intended to create a second "bathtub" above the above-mentioned intermediate loop B.
La figure 7 est analogue à la figure 6, sauf que le panneau 17 a été supprimé et remplacé par une plaque transparente horizontale, par exemple en verre ou en plastique tel que polyméthacrylate, fixée sur le déflecteur D3 dans le plan de sa paroi supérieure 12, pour faciliter la visualisation des denrées 5.Figure 7 is similar to Figure 6, except that the panel 17 has been removed and replaced by a horizontal transparent plate, for example glass or plastic such as polymethacrylate, fixed on the deflector D3 in the plane of its upper wall 12 , to facilitate the visualization of food 5.
La figure 8 regroupe ensemble les variantes des figures 6 et 7, avec le panneau 17 monté sur la plaque 18 précitée.FIG. 8 groups together the variants of FIGS. 6 and 7, with the panel 17 mounted on the aforementioned plate 18.
On voit mieux sur la figure 1 que dans le meuble de l'invention, les écoulements d'air froid ou relativement froid par rapport à l'air ambiant définissent une structure stratifiée ou à couche d'air multiple assurant une déperdition d'énergie minimale au niveau de l'ouverture 3.It is better to see in FIG. 1 that in the furniture of the invention, the flows of cold or relatively cold air with respect to the ambient air define a stratified structure or with a multiple layer of air ensuring minimal energy loss at the opening 3.
Bien que l'invention ait été décrite en liaison avec plusieurs modes de réalisation particuliers, il est bien évident qu'elle n'y est pas limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont effectuées dans le cadre des revendications qui suivent. Although the invention has been described in connection with several particular embodiments, it is obvious that it is not limited to it and that it includes all the technical equivalents of the means described as well as their combinations if these are carried out in the context of the claims which follow.

Claims

Revendications claims
1. Meuble frigorifique de vente horizontal et ouvert, destiné aux denrées surgelées ou réfrigérées (5), du type comportant un circuit principal d'air froid (6) ayant des buses de soufflage d'air froid (9), pour former au moins un rideau d'air froid (R) à la surface des denrées qui sont exposées à l'air ambiant et une reprise (10) de cet air froid, caractérisé en ce que l'air froid est soufflé à une vitesse telle, par exemple de l'ordre de 2 m/s, que l'écoulement d'air devient turbulent et en ce qu'un déflecteur (Dl, D2, D3) est prévu au niveau de la reprise d'air froid (10) pour retourner un flux d'air mélangé relativement plus froid que l'air ambiant en sens inverse au-dessus du rideau d'air froid précité (R), formant une boucle d'air mélangé relativement froid intermédiaire (B) entre le rideau d'air froid et l'air ambiant.1. Horizontal and open refrigerated display cabinet, intended for frozen or refrigerated foodstuffs (5), of the type comprising a main cold air circuit (6) having cold air blowing nozzles (9), to form at least a curtain of cold air (R) on the surface of the products which are exposed to the ambient air and a return (10) of this cold air, characterized in that the cold air is blown at such a speed, for example of the order of 2 m / s, that the air flow becomes turbulent and that a deflector (Dl, D2, D3) is provided at the level of the cold air intake (10) to return a flow of mixed air relatively cooler than ambient air in opposite directions above the aforementioned cold air curtain (R), forming a loop of relatively cold mixed air intermediate (B) between the cold air curtain and the ambient air.
2. Meuble selon la revendication 1, caractérisé en ce que le déflecteur (Dl, D3) a en section une forme sensiblement en U couché dont l'ouverture est orientée vers l'intérieur du meuble.2. Furniture according to claim 1, characterized in that the deflector (Dl, D3) has in section a substantially U-shaped shape whose opening is oriented towards the inside of the furniture.
3. Meuble selon la revendication 1, caractérisé en ce que le déflecteur (D2) a en section une forme sensiblement en C aplati ou en chistera dont l'ouverture est orientée vers l'intérieur du meuble.3. Furniture according to claim 1, characterized in that the deflector (D2) has in section a shape substantially flattened C or chistera whose opening is oriented towards the interior of the furniture.
4. Meuble selon l'une des revendications précédentes, caractérisé en ce que la partie supérieure (12) du déflecteur est équipée d'une doublure (13) interne et espacée de celle-ci, ladite doublure (13) définissant avec ladite partie supérieure (12) du déflecteur un canal (C) divergeant ou en section croissante dans le sens contraire à l'écoulement du flux d'air froid (R) .4. Furniture according to one of the preceding claims, characterized in that the upper part (12) of the deflector is equipped with an internal lining (13) and spaced therefrom, said lining (13) defining with said upper part (12) of the deflector a channel (C) diverging or in increasing section in the opposite direction to the flow of the cold air flow (R).
5. Meuble selon l'une des revendications précédentes, caractérisé en ce que la partie inférieure (10) du déflecteur est équipée d'un séparateur (14, 15, 16) pour séparer le flux d'air aspiré par le circuit principal (6) du flux d'air mélangé retourné en sens inverse dans le meuble.5. Furniture according to one of the preceding claims, characterized in that the lower part (10) of the deflector is equipped with a separator (14, 15, 16) to separate the flow of air sucked in by the main circuit (6 ) mixed air flow returned in the opposite direction in the cabinet.
6. Meuble selon la revendication 5, caractérisé en ce que le séparateur est une plaque (16) courbée en direction du flux d'air mélangé (B) rentrant dans le déflecteur (D3), ladite plaque étant espacée de la partie inférieure du déflecteur pour définir un passage secondaire (P2) avec la reprise d'air (10).6. Furniture according to claim 5, characterized in that the separator is a plate (16) curved in the direction of the mixed air flow (B) entering the deflector (D3), said plate being spaced from the lower part of the deflector to define a secondary passage (P2) with the air intake (10).
7. Meuble selon la revendication 5, caractérisé en ce que le séparateur est une plaque (14) courbée en direction du flux d'air froid aspiré par le circuit principal (6), ladite plaque étant espacée de la partie inférieure du déflecteur pour définir un passage secondaire (PI) avec la reprise d'air (10).7. Furniture according to claim 5, characterized in that the separator is a plate (14) curved in the direction of the flow of cold air drawn in by the main circuit (6), said plate being spaced from the lower part of the deflector to define a secondary passage (PI) with the air intake (10).
8. Meuble selon l'une des revendications précédentes, caractérisé en ce qu'il est équipé d'un vitrage vertical (11) au niveau de la reprise d'air (10), le vitrage faisant fonctionnellement partie du déflecteur précité (Dl).8. Furniture according to one of the preceding claims, characterized in that it is equipped with vertical glazing (11) at the air intake (10), the glazing being functionally part of the aforementioned deflector (Dl) .
9. Meμble selon l'une des revendications précédentes, caractérisé par un panneau vertical (17) monté sur le déflecteur précité (D3) pour former une seconde "baignoire" au-dessus de la boucle intermédiaire précitée (B).9. Meμble according to one of the preceding claims, characterized by a vertical panel (17) mounted on the aforementioned deflector (D3) to form a second "bathtub" above the aforementioned intermediate loop (B).
10. Meuble selon l'une des revendications précédentes, caractérisé en ce qu'il comporte une structure à couches d'air multiples, de plus en plus froides, en partant par exemple d'une couche d'air superficielle ralentie (S) jusqu'au rideau d'air froid principal (R), en passant par la boucle d'air mélangé relativement plus froid intermédiaire (B) . 10. Furniture according to one of the preceding claims, characterized in that it comprises a structure with multiple air layers, increasingly cold, starting for example from a slowed surface air layer (S) up to '' to the main cold air curtain (R), passing through the intermediate cooler mixed air loop (B).
EP96937385A 1995-11-10 1996-10-31 Open horizontal refrigerated display cabinet for frozen or refrigerated food Expired - Lifetime EP0957732B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9513359A FR2741141B1 (en) 1995-11-10 1995-11-10 HORIZONTAL AND OPEN REFRIGERATED SALES FURNITURE FOR FROZEN OR CHILLED FOOD
FR9513359 1995-11-10
PCT/FR1996/001725 WO1997017003A1 (en) 1995-11-10 1996-10-31 Open horizontal refrigerated display cabinet for frozen or refrigerated food

Publications (2)

Publication Number Publication Date
EP0957732A1 true EP0957732A1 (en) 1999-11-24
EP0957732B1 EP0957732B1 (en) 2002-08-14

Family

ID=9484456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96937385A Expired - Lifetime EP0957732B1 (en) 1995-11-10 1996-10-31 Open horizontal refrigerated display cabinet for frozen or refrigerated food

Country Status (4)

Country Link
EP (1) EP0957732B1 (en)
DE (1) DE69623061T2 (en)
FR (1) FR2741141B1 (en)
WO (1) WO1997017003A1 (en)

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CN103720244A (en) * 2013-12-19 2014-04-16 大连三洋冷链有限公司 Heat-pump-type cooling-heating display cabinet
US9861213B2 (en) 2014-11-13 2018-01-09 The Vollrath Company, L.L.C. Forced cold air well with false bottom insert

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Publication number Priority date Publication date Assignee Title
FR2786999B1 (en) 1998-12-09 2001-02-23 Nevoret Concept REFRIGERATION SALES FURNITURE

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US2447759A (en) * 1941-10-20 1948-08-24 C V Hill & Company Inc Open top access refrigerated display case
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN103720244A (en) * 2013-12-19 2014-04-16 大连三洋冷链有限公司 Heat-pump-type cooling-heating display cabinet
US9861213B2 (en) 2014-11-13 2018-01-09 The Vollrath Company, L.L.C. Forced cold air well with false bottom insert

Also Published As

Publication number Publication date
DE69623061D1 (en) 2002-09-19
EP0957732B1 (en) 2002-08-14
FR2741141B1 (en) 1998-01-02
FR2741141A1 (en) 1997-05-16
WO1997017003A1 (en) 1997-05-15
DE69623061T2 (en) 2003-03-20

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