EP0828126B1 - Ventilation apparatus for drying products,especially freshly formed products to be cured afterwards - Google Patents

Ventilation apparatus for drying products,especially freshly formed products to be cured afterwards Download PDF

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Publication number
EP0828126B1
EP0828126B1 EP97402057A EP97402057A EP0828126B1 EP 0828126 B1 EP0828126 B1 EP 0828126B1 EP 97402057 A EP97402057 A EP 97402057A EP 97402057 A EP97402057 A EP 97402057A EP 0828126 B1 EP0828126 B1 EP 0828126B1
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Prior art keywords
opening
axis
box
box structure
air flow
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German (de)
French (fr)
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EP0828126A1 (en
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Philippe Hatton
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Ceric SARL
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Ceric SARL
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/022—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow
    • F26B21/024—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow by using movable fan units

Definitions

  • the present invention relates to a ventilation device for drying of stacked products according to the preamble of claim 1.
  • a ventilation device for drying of stacked products according to the preamble of claim 1.
  • Such a device is known from EP-A-0 017 665. It is more particularly intended for industry ceramic and for example the drying of raw products in the ground before their passage in a baking oven.
  • Ventilation vertical or horizontal axis, which either have an energy efficiency insufficient or require a plurality of fans.
  • the present invention relates to a ventilation device which has good better performance than known devices.
  • the present invention relates to a ventilation device for drying stacked products of the type comprising a box provided on the one hand with a fan and on the other hand, outlet openings, the fan being arranged at the end of said box to propel an air flow characterized by the fact that the axis of the ventilation flow makes with the plane containing the outlet opening an angle "a" such that this opening cuts totally fan flow.
  • the invention also relates to a drying enclosure comprising, between the rows of products to be dried in the corridors in which circulation devices circulate ventilation according to the present invention.
  • Figure 1 a front view and in section along AA of a device for ventilation with known vertical axis.
  • Figure 2 three views in side elevation, from behind and in plan of a ventilation device with horizontal axis of known type.
  • Figure 3 a side elevational view of an axis ventilation device oblique according to the invention
  • Figure 4 a front view of the ventilation device in Figure 3.
  • FIG. 5 a partial perspective view of the ventilation device Figures 3 and 4.
  • Figure 6 a top view of the ventilation device of Figures 3 to 5.
  • Figure 7 a side elevational view of an alternative embodiment of the invention.
  • FIG. 1 and 2 show two ventilation devices of known type; FIG. 1 representing a device with a vertical axis and FIG. 2 a device with a axis horizontal.
  • the device consists of a cylinder 10, with a vertical axis, surmounted by a fan 11, driven by a motor 12 and comprising two lateral openings 13 and 14 located along two generators diametrically opposite
  • This device has two drawbacks. The first is that the air flow entering the cylinder through the opening 15 causes a venturi effect which has for result that there is no blown air on the stacks at the top of the cylinder (about 50 cm) but on the contrary a slight aspiration. Products B located at upper part of the A stacks are therefore poorly dried.
  • the second drawback is that the enclosure of the cylinder 10 must be pressurized so that the air is blown horizontally through the longitudinal slots 13 and 14. This necessary pressurization constitutes a loss of energy so that the efficiency of the device in is affected.
  • the ventilation device comprises a box 20 which comprises two side openings 24, opposite, extending over the entire height of said box 20.
  • a plurality of fans 21 are arranged one above the other over the entire height and are arranged to blow the drying air in one direction represented by the arrow fl. This air flow is deflected 90 ° on one side and 90 ° on the other by covers 23 which divide the air flow into two opposite streams f2 which arrive at the openings 24.
  • This device has the advantage of eliminating the two drawbacks of the device of Figure 1 but has the disadvantage of requiring a large number of fans 21, each driven by a motor 22 and therefore to be expensive, more the 90 ° deflection of the air flow causes energy loss.
  • the present invention relates to a ventilation device having neither the drawbacks of the device of FIG. 1 nor that of FIG. 2.
  • This device consists of a box 30 provided at its upper part a circular opening 35 in which is placed a fan 31 driven by a motor 32, and the outlet opening 33 of said box 30 is in a plane which is oblique to the X axis of the box which is also the axis of the air flow.
  • the X axis of the air flow is oblique and the outlet opening 33 of the box 30 is in a vertical plane.
  • the box 30 is a rectangular parallelepiped of which the X axis is arranged obliquely, and the fan 31 is placed in the casing 30 so that the axis of the air flow which it causes coincides with the X axis of the box.
  • the section of the parallelepiped 30 by a vertical plane is a rectangle 33 whose short side is equal to the side of the square section of the box 30; the angle "a" that makes the X axis with said vertical plane is determined so that the long side of said rectangle 33 has a length substantially equal to the height "h" of the stacks A.
  • this angle "a” is approximately 30 °. In practice it must be between 20 ° and 40 ° but whatever the value of this angle "a", it is such that the outlet opening 33 completely cuts off the flow of the fan 31.
  • the enclosure of drying 40 comprises several pairs C of rows of stackings A between which are created in corridors D.
  • the enclosure of drying 40 comprises several pairs C of rows of stackings A between which are created in corridors D.
  • a plurality of ventilation devices E are move in corridors D, each ventilation device E being in accordance with device described in Figures 3 to 5.
  • the box 30 has a section square slightly larger than the diameter of the fan 31, this arrangement being geometrically the most convenient. But it is obvious that to adapt the box air distribution constituted by the opening 33, the slats and the plate 36 can adapt the dimensions of the rectangular parallelepiped constituting the box 30; the invention being in no way limited to the embodiment chosen.
  • the air flow leaving through the orifices 13 and 14 was partly high oriented at about 45 ° obliquely downwards, this obliquity decreasing gradually to be practically zero at about 50 cm from the entrance of the box, but the speed of the flow was very low at the top so as not to reach its maximum at the base of the box.
  • the invention is not limited to the case where the box 30 is a rectangular or square section.
  • This box can indeed be a cylinder whose directrix can be a circle where an ellipse in this case the opening 33 is an ellipse and the dimensions of cylinder 30 and the value of angle "a" must be determined so that the major axis of the ellipse is practically equal to "h".
  • Figure 7 shows an alternative embodiment which is in fact the second possible alternative embodiment of the invention: in the first case ( Figures 3 to 6) the X axis is oblique and the opening 33 vertical; in the second case (figure 7) the X axis is vertical and the opening 33 oblique. Apart from that all the elements are the same and carry therefore the same references.

Abstract

The ventilator is mounted at the upper end of a casing to drive an air flow parallel to the axis of the casing. The outlet opening (33) for the air flow is disposed obliquely with respect to the axis of the casing. The outlet opening can have multiple blades (34) fixed to a plate (36) situated in a plane parallel to that containing the outlet opening so that the flow of air is deflected in a horizontal direction perpendicular to the rows of stacks of product to be dried. The axis of the casing can form an angle 'a' of between twenty and forty degrees with the plane containing the outlet opening.

Description

La présente invention concerne un dispositif de ventilation pour séchage de produits empilés selon le préambule de la revendication 1. Un tel dispositif est connu par le EP-A-0 017 665. Elle est plus particulièrement destinée à l'industrie céramique et par exemple au séchage de produits crus en terre avant leur passage dans un four de cuisson.The present invention relates to a ventilation device for drying of stacked products according to the preamble of claim 1. Such a device is known from EP-A-0 017 665. It is more particularly intended for industry ceramic and for example the drying of raw products in the ground before their passage in a baking oven.

Il est connu de faire disposer des empilages de produits crus (briques ou tuiles par exemple) provenant d'un atelier de moulage dans un séchoir. Ces empilages sont disposés en rangées parallèles séparées par des couloirs dans lesquels se déplacent des ventilateurs qui soufflent de l'air chaud et sec sur ces empilages.It is known to have stacks of raw products (bricks or tiles for example) from a molding workshop in a dryer. These stacks are arranged in parallel rows separated by corridors in which move fans that blow hot, dry air onto these stacks.

Dans les dispositifs connus on emploie deux types de dispositifs de ventilation: à axe vertical ou à axe horizontal, qui ou bien ont un rendement énergétique insuffisant ou bien nécessitent une pluralité de ventilateurs.In the known devices, two types of device are used. ventilation: vertical or horizontal axis, which either have an energy efficiency insufficient or require a plurality of fans.

Dans le brevet français n° 699.030 par exemple, on dispose au-dessus de chaque empilage un ventilateur à axe horizontal, qui est placé dans un caisson qui dévie le flux d'air à 90° pour le diriger verticalement vers le bas, ce après quoi ce flux d'air est à nouveau dévié par des ailettes pour pénétrer dans l'empilage. Cette double déviation du flux d'air entraíne une perte d'énergie très importante.In French Patent No. 699,030 for example, there are above each stack a fan with a horizontal axis, which is placed in a box which deflects the air flow at 90 ° to direct it vertically downwards, after which this air flow is again deflected by fins to enter the stack. This double deviation of the air flow causes a very significant loss of energy.

Dans le brevet français d'addition 22.590 on a décrit un caisson roulant dans lequel le flux d'air est introduit verticalement de haut en bas pour être ensuite dévié une première fois pour devenir horizontal ce après quoi, il est à nouveau dévié par des ailettes pour être dirigé obliquement vers le haut. Là également cette double déviation absorbe une très importante quantité d'énergie.In the French patent of addition 22,590 a rolling box has been described in which the air flow is introduced vertically from top to bottom to be then diverted a first time to become horizontal, after which it is deflected again by fins to be directed obliquely upwards. There also this double deviation absorbs a very large amount of energy.

Dans le brevet EP 0.017 665, on dispose entre les empilages un caisson dont les parois convergent légèrement vers le bas, muni à sa partie supérieure d'une pluralité de ventilateur, les parois comportant des fentes latérales. Ce caisson est mis sous pression par les ventilateurs et l'air ainsi mis sous pression s'échappe par les fentes latérales. Une telle mise en pression de l'air absorbe beaucoup d'énergie.In patent EP 0.017 665, a box is placed between the stacks. the walls converge slightly downward, provided at its upper part with a plurality fan, the walls having side slots. This box is placed under pressure by the fans and the air thus pressurized escapes through the slots side. Such pressurization of the air absorbs a lot of energy.

Dans le brevet GB 2.039.013, on a décrit un dispositif constitué par une gaine conique rotative, munie de fentes longitudinales. Ce dispositif présente les mêmes inconvénients que celui du brevet précédent EP 0.017.665 auquel s'ajoute le fait que la distance entre la fente, et les produits à sécher varie continuellement ce qui nuit a l'homogénéité du séchage.In patent GB 2,039,013, a device has been described consisting of a conical rotary sheath, provided with longitudinal slots. This device has the same disadvantages than that of the previous patent EP 0.017.665 to which is added the fact that the distance between the slit and the products to be dried varies continuously which harms homogeneity of drying.

La présente invention concerne un dispositif de ventilation qui a de bien meilleures performances que les dispositifs connus.The present invention relates to a ventilation device which has good better performance than known devices.

La présente invention concerne un dispositif de ventilation pour séchage de produits empilés du type comportant un caisson muni d'une part d'un ventilateur et d'autre part, d'ouvertures de sortie, le ventilateur étant disposé à l'extrémité dudit caisson pour y propulser un flux d'air caractérisé par le fait que l'axe du flux de ventilation fait avec le plan contenant l'ouverture de sortie un angle "a" tel que cette ouverture coupe totalement le flux du ventilateur.The present invention relates to a ventilation device for drying stacked products of the type comprising a box provided on the one hand with a fan and on the other hand, outlet openings, the fan being arranged at the end of said box to propel an air flow characterized by the fact that the axis of the ventilation flow makes with the plane containing the outlet opening an angle "a" such that this opening cuts totally fan flow.

Ce dispositif est encore remarquable en ce que :

  • a/ l'ouverture de sortie est munie d'une pluralité de lamelles fixées à une plaque située dans un plan parallèle à celui contenant l'ouverture de sorte que le flux d'air soit dévié dans des directions horizontales pratiquement perpendiculaires aux rangées d'empilages de produits à sécher.
  • b/ l'axe du caisson fait avec le plan contenant l'ouverture de sortie un angle compris entre 20° et 40° et de préférence égal à 30°;
  • c/ les dimensions du caisson et la valeur de l'angle sont déterminées de façon telle que la hauteur de l'ouverture soit sensiblement égale à la hauteur des empilages de produits à sécher;
  • d/ l'ouverture de sortie du caisson est verticale, l'axe dudit caisson étant oblique;
  • e/ l'axe du caisson est vertical, le plan contenant l'ouverture du caisson étant oblique;
  • f/ le caisson est un cylindre et l'ouverture est ovale.
  • g/ le caisson est parallélépipédique et l'ouverture est rectangulaire.
    • This device is still remarkable in that:
  • a / the outlet opening is provided with a plurality of strips fixed to a plate situated in a plane parallel to that containing the opening so that the air flow is deflected in horizontal directions practically perpendicular to the rows of stacks of products to be dried.
  • b / the axis of the box made with the plane containing the outlet opening at an angle between 20 ° and 40 ° and preferably equal to 30 °;
  • c / the dimensions of the box and the value of the angle are determined so that the height of the opening is substantially equal to the height of the stacks of products to be dried;
  • d / the outlet opening of the box is vertical, the axis of said box being oblique;
  • e / the axis of the box is vertical, the plane containing the opening of the box being oblique;
  • f / the box is a cylinder and the opening is oval.
  • g / the box is rectangular and the opening is rectangular.

    • L'invention concerne également une enceinte de séchage comportant, entre les rangées de produits à sécher des couloirs dans lesquels circulent des dispositifs de ventilation conformes à la présente invention.The invention also relates to a drying enclosure comprising, between the rows of products to be dried in the corridors in which circulation devices circulate ventilation according to the present invention.

    A titre d'exemple et pour faciliter la compréhension de l'invention on a représenté aux dessins annexés. By way of example and to facilitate understanding of the invention, we have shown in the accompanying drawings.

    Figure 1 : une vue de face et en coupe selon AA d'un dispositif de ventilation à axe vertical connu.Figure 1: a front view and in section along AA of a device for ventilation with known vertical axis.

    Figure 2 : trois vues en élévation latérale, en vue de derrière et en plan d'un dispositif de ventilation à axe horizontal de type connu.Figure 2: three views in side elevation, from behind and in plan of a ventilation device with horizontal axis of known type.

    Figure 3 : une vue en élévation latérale d'un dispositif de ventilation à axe oblique selon l'inventionFigure 3: a side elevational view of an axis ventilation device oblique according to the invention

    Figure 4 : une vue de face du dispositif de ventilation de la figure 3.Figure 4: a front view of the ventilation device in Figure 3.

    Figure 5 : une vue partielle en perspective du dispositif de ventilation des figures 3 et 4.Figure 5: a partial perspective view of the ventilation device Figures 3 and 4.

    Figure 6 : une vue de dessus du dispositif de ventilation des figures 3 à 5.Figure 6: a top view of the ventilation device of Figures 3 to 5.

    Figure 7 : une vue en élévation latérale d'une variante de réalisation de l'invention.Figure 7: a side elevational view of an alternative embodiment of the invention.

    Les figures 1 et 2 représentent deux dispositifs de ventilation de type connu; la figure 1 représentant un dispositif à axe vertical et la figure 2 un dispositif à axe horizontal.Figures 1 and 2 show two ventilation devices of known type; FIG. 1 representing a device with a vertical axis and FIG. 2 a device with a axis horizontal.

    Sur les figures la et 1b on voit que le dispositif est constitué d'un cylindre 10, à axe vertical, surmonté d'un ventilateur 11, entraíné par un moteur 12 et comportant deux ouvertures latérales 13 et 14 situées le long de deux génératrices diamétralement opposéesIn Figures la and 1b we see that the device consists of a cylinder 10, with a vertical axis, surmounted by a fan 11, driven by a motor 12 and comprising two lateral openings 13 and 14 located along two generators diametrically opposite

    L'air, aspiré par le ventilateur il entre par l'ouverture 15, descend verticalement dans le cylindre 10 dans lequel il est mis en pression de sorte qu'il sort latéralement par les ouvertures 13 et 14 en étant dirigé perpendiculairement aux empilages A de produits crus B.The air, sucked in by the fan it enters through the opening 15, descends vertically in cylinder 10 in which it is pressurized so that it exits laterally through the openings 13 and 14, being directed perpendicular to the stacks A of raw products B.

    Ce dispositif présente deux inconvénients. Le premier est que le flux d'air pénétrant dans le cylindre par l'ouverture 15 provoque un effet venturi qui a pour résultat qu'il n'y a pas d'air soufflé sur les empilages à la partie haute du cylindre (environ sur 50 cm) mais au contraire une légère aspiration. Les produits B situés à la partie supérieure des empilages A sont donc mal séchés. Le deuxième inconvénient est qu'il faut que l'enceinte du cylindre 10 soit mise sous pression pour que l'air soit soufflé horizontalement à travers les fentes longitudinales 13 et 14. Cette nécessaire mise en pression constitue une perte d'énergie de sorte que le rendement du dispositif en est affecté. This device has two drawbacks. The first is that the air flow entering the cylinder through the opening 15 causes a venturi effect which has for result that there is no blown air on the stacks at the top of the cylinder (about 50 cm) but on the contrary a slight aspiration. Products B located at upper part of the A stacks are therefore poorly dried. The second drawback is that the enclosure of the cylinder 10 must be pressurized so that the air is blown horizontally through the longitudinal slots 13 and 14. This necessary pressurization constitutes a loss of energy so that the efficiency of the device in is affected.

    Pour éviter ces deux inconvénients on a imaginé le dispositif représenté aux figures 2a et 2c.To avoid these two drawbacks, the device shown in Figures 2a and 2c.

    Le dispositif de ventilation comporte un caisson 20 qui comporte deux ouvertures latérales 24, opposées, s'étendant sur toute la hauteur dudit caisson 20. Une pluralité de ventilateurs 21 sont disposés les uns au-dessus des autres sur toute la hauteur et sont disposés de façon à souffler l'air de séchage selon une direction représentée par la flèche fl. Ce flux d'air est dévié de 90° d'un côté et de 90° d'un autre par des capotages 23 qui divisent le flux d'air en deux courants opposés f2 qui arrivent aux ouvertures 24.The ventilation device comprises a box 20 which comprises two side openings 24, opposite, extending over the entire height of said box 20. A plurality of fans 21 are arranged one above the other over the entire height and are arranged to blow the drying air in one direction represented by the arrow fl. This air flow is deflected 90 ° on one side and 90 ° on the other by covers 23 which divide the air flow into two opposite streams f2 which arrive at the openings 24.

    Ce dispositif a l'avantage de supprimer les deux inconvénients du dispositif de la figure 1 mais présente l'inconvénient de nécessiter un grand nombre de ventilateurs 21, chacun entraíné par un moteur 22 et donc d'être onéreux, de plus la déviation sur 90° du flux d'air provoque une perte d'énergie.This device has the advantage of eliminating the two drawbacks of the device of Figure 1 but has the disadvantage of requiring a large number of fans 21, each driven by a motor 22 and therefore to be expensive, more the 90 ° deflection of the air flow causes energy loss.

    La présente invention concerne un dispositif de ventilation ne présentant ni les inconvénients du dispositif de la figure 1 ni celui de la figure 2.The present invention relates to a ventilation device having neither the drawbacks of the device of FIG. 1 nor that of FIG. 2.

    Ce dispositif est constitué par un caisson 30 muni à sa partie supérieure d'une ouverture circulaire 35 dans laquelle est placé un ventilateur 31 entraíné par un moteur 32, et l'ouverture de sortie 33 dudit caisson 30 se trouve dans un plan qui est oblique par rapport à l'axe X du caisson qui est aussi l'axe du flux d'air.This device consists of a box 30 provided at its upper part a circular opening 35 in which is placed a fan 31 driven by a motor 32, and the outlet opening 33 of said box 30 is in a plane which is oblique to the X axis of the box which is also the axis of the air flow.

    Dans l'exemple représenté aux figures 3 à 6 l'axe X du flux d'air est oblique et l'ouverture de sortie 33 du caisson 30 est dans un plan vertical.In the example shown in Figures 3 to 6 the X axis of the air flow is oblique and the outlet opening 33 of the box 30 is in a vertical plane.

    En se reportant aux figures 3 à 6 on voit que le caisson 30 est un parallélépipède de section carrée dont l'axe X est disposé obliquement, et le ventilateur 31 est placé dans le caisson 30 de façon que l'axe du flux d'air qu'il provoque coïncide avec l'axe X du caisson.Referring to Figures 3 to 6 we see that the box 30 is a rectangular parallelepiped of which the X axis is arranged obliquely, and the fan 31 is placed in the casing 30 so that the axis of the air flow which it causes coincides with the X axis of the box.

    La section du parallélépipède 30 par un plan vertical est un rectangle 33 dont le petit côté est égal au côté de la section carrée du caisson 30; l'angle "a" que fait l'axe X avec ledit plan vertical est déterminé de façon que le grand côté dudit rectangle 33 ait une longueur sensiblement égale à la hauteur "h" des empilages A.The section of the parallelepiped 30 by a vertical plane is a rectangle 33 whose short side is equal to the side of the square section of the box 30; the angle "a" that makes the X axis with said vertical plane is determined so that the long side of said rectangle 33 has a length substantially equal to the height "h" of the stacks A.

    Dans l'exemple représenté cet angle "a" est d'environ 30°. Dans la pratique il doit être compris entre 20° et 40° mais quelle que soit la valeur de cet angle "a", il est tel que l'ouverture de sortie 33 coupe totalement le flux du ventilateur 31. In the example shown, this angle "a" is approximately 30 °. In practice it must be between 20 ° and 40 ° but whatever the value of this angle "a", it is such that the outlet opening 33 completely cuts off the flow of the fan 31.

    Sur cette ouverture du caisson 30 qui constitue le rectangle 33 on dispose une pluralité de lamelles 34 reliées à une plaque verticale 36, parallèle à l'ouverture 33.On this opening of the box 30 which constitutes the rectangle 33 we have a plurality of strips 34 connected to a vertical plate 36, parallel to the opening 33.

    Il en résulte que le flux d'air aspiré par le ventilateur 32, descend dans le caisson selon la flèche F1, parallèle à l'axe X, puis est dévié par les lames 34 de façon à sortir horizontalement selon les flèches F2 et cela sur toute la hauteur de l'ouverture 33 donc sur toute la hauteur "h", les flèches F2 étant parallèles au plan vertical contenant la plaque 36 (voir figure 5). Il en résulte:

    • que le flux d'air de séchage est efficace sur toute la hauteur des empilages A;
    • qu'il n'y a pas ou pratiquement pas de perte d'énergie par mise en pression du flux d'air;
    • qu'un seul ventilateur par caisson est nécessaire.
    It follows that the air flow sucked by the fan 32, descends into the box according to the arrow F1, parallel to the axis X, then is deflected by the blades 34 so as to exit horizontally according to the arrows F2 and this on the entire height of the opening 33 therefore over the entire height "h", the arrows F2 being parallel to the vertical plane containing the plate 36 (see FIG. 5). The result is:
    • that the drying air flow is effective over the entire height of the stacks A;
    • that there is no or practically no loss of energy by pressurizing the air flow;
    • only one fan per case is required.

    Tous ces avantages ont pour effet que ce dispositif de ventilation a un meilleur rendement énergétique et un coût de production inférieur aux dispositifs antérieurs connus.All these advantages have the effect that this ventilation device has a better energy efficiency and lower production cost than the devices known prior.

    De préférence, comme cela est représenté aux figures 4 à 6, l'enceinte de séchage 40 comporte plusieurs paires C de rangées d'empilages A entre lesquels sont ménagés des couloirs D. Dans l'exemple représenté figure 6 il y a deux paires C de rangées d'empilages et trois couloirs D. Une pluralité de dispositifs de ventilation E se déplacent dans les couloirs D, chaque dispositif de ventilation E étant conforme au dispositif décrit aux figures 3 à 5.Preferably, as shown in Figures 4 to 6, the enclosure of drying 40 comprises several pairs C of rows of stackings A between which are created in corridors D. In the example shown in Figure 6 there are two pairs C of rows of stacks and three aisles D. A plurality of ventilation devices E are move in corridors D, each ventilation device E being in accordance with device described in Figures 3 to 5.

    Il est à noter que dans l'exemple représenté le caisson 30 a une section carrée légèrement supérieure au diamètre du ventilateur 31, cette disposition étant géométriquement la plus commode. Mais il est bien évident que pour adapter le caisson de répartition d'air constitué par l'ouverture 33, les lamelles et la plaque 36 on peut adapter les dimensions du parallélépipède rectangle constituant le caisson 30; l'invention n'étant nullement limitée à l'exemple de réalisation choisi.It should be noted that in the example shown the box 30 has a section square slightly larger than the diameter of the fan 31, this arrangement being geometrically the most convenient. But it is obvious that to adapt the box air distribution constituted by the opening 33, the slats and the plate 36 can adapt the dimensions of the rectangular parallelepiped constituting the box 30; the invention being in no way limited to the embodiment chosen.

    Il a été procédé à des tests comparatifs entre un dispositif à caisson cylindrique à axe vertical, comme le caisson 10 de la figure 1 et un caisson parallélépipédique à axe oblique, comme le caisson 30 de la figure 3 à 6, les deux caissons étant munis du même ventilateur entraíné par le même moteur, la vitesse de l'air aspiré dans le caisson étant de 15 m/sec.Comparative tests were carried out between a caisson device cylindrical with vertical axis, like the box 10 in FIG. 1 and a box oblique axis parallelepiped, like the box 30 of figure 3 to 6, both being housed with the same fan driven by the same motor, the speed of the air drawn into the box being 15 m / sec.

    Dans le caisson 10 la pression statique était de 25 mmCE alors que dans le caisson 30 elle était de 12 mmCE.In the box 10 the static pressure was 25 mmCE while in the box 30 it was 12 mmCE.

    Dans le caisson 10 le flux d'air sortant par les orifices 13 et 14 était en partie haute orienté à environ 45° obliquement vers le bas, cette oblicité diminuant progressivement pour être pratiquement nulle à environ 50 cm de l'entrée du caisson, mais la vitesse du flux était très faible en partie haute pour n'atteindre son maximum qu'à la base du caisson.In the box 10 the air flow leaving through the orifices 13 and 14 was partly high oriented at about 45 ° obliquely downwards, this obliquity decreasing gradually to be practically zero at about 50 cm from the entrance of the box, but the speed of the flow was very low at the top so as not to reach its maximum at the base of the box.

    Ce qui montre que la ventilation d'un empilage n'est vraiment correcte qu'en partie basse.This shows that the ventilation of a stack is only really correct in lower part.

    Par contre avec le caisson 30 et le coffrage 34/36 on obtient non seulement une moins grande perte d'énergie (mise en pression inférieure) mais une parfaite répartition des filets d'air selon la flèche F2 tous horizontaux et de même vitesse.By cons with the box 30 and the formwork 34/36 we obtain not only less energy loss (lower pressurization) but perfect distribution of the air streams according to arrow F2 all horizontal and at the same speed.

    D'autre part l'invention n'est pas limitée au cas où le caisson 30 est un parallélépipède de section carrée ou rectangulaire. Ce caisson peut en effet être un cylindre dont la directrice peut être un cercle où un ellipse dans ce cas l'ouverture 33 est une ellipse et les dimensions du cylindre 30 et la valeur de l'angle "a" doivent être déterminées de façon que le grand axe de l'ellipse soit pratiquement égal à "h".On the other hand the invention is not limited to the case where the box 30 is a rectangular or square section. This box can indeed be a cylinder whose directrix can be a circle where an ellipse in this case the opening 33 is an ellipse and the dimensions of cylinder 30 and the value of angle "a" must be determined so that the major axis of the ellipse is practically equal to "h".

    La figure 7 représente une variante de réalisation qui est en fait la deuxième alternative possible de réalisation de l'invention : dans le premier cas (figures 3 à 6) l'axe X est oblique et l'ouverture 33 verticale; dans le deuxième cas (figure 7) l'axe X est vertical et l'ouverture 33 oblique. A part cela tous les éléments sont les mêmes et portent donc les mêmes références.Figure 7 shows an alternative embodiment which is in fact the second possible alternative embodiment of the invention: in the first case (Figures 3 to 6) the X axis is oblique and the opening 33 vertical; in the second case (figure 7) the X axis is vertical and the opening 33 oblique. Apart from that all the elements are the same and carry therefore the same references.

    Claims (8)

    1. A ventilation device for drying stacked products, of the type comprising a box structure (30) provided firstly with a fan (31) and secondly with outlet openings (33), the fan being arranged at the end of said box structure in order to impel an air flow therein, characterised by the fact that the axis (X) of the ventilation flow forms an angle "a" with the plane containing the outlet opening (33) such that said opening completely cuts off the flow of the fan.
    2. A ventilation device according to Claim 1, in which the outlet opening (33) is provided with a plurality of blades (34) fixed to a plate (36) which is located in a plane parallel to the one containing the opening (33) such that the air flow is deflected into horizontal directions (F2) which are practically perpendicular to the rows of stacks (a) of products to be dried.
    3. A device according to Claim 2, in which the dimensions of the box structure (30) and the value of the angle "a" are determined such that the height (H) of the opening (33) is substantially equal to the height (h) of the stacks (A) of products to be dried.
    4. A device according to any one of Claims 1 to 3 in which the outlet opening (33) of the box structure (30) is vertical, the axis (X) of said box structure (30) and of the air flow being oblique.
    5. A device according to any one of Claims 1 to 3, in which the axis (X) of the box structure (30) and of the air flow is vertical, the plane containing the opening (33) of the box structure (30) being oblique.
    6. A device according to any one of Claims 1 to 5, in which the box structure (30) is a cylinder and the opening (33) is oval.
    7. A device according to any one of Claims 1 to 5, in which the box structure (30) is parallelepipedal, the opening (33) being rectangular.
    8. A drying chamber (40) in which are arranged parallel rows (C) of stacks
      (A) forming between them corridors (D) through which ventilation devices (E) according to Claims 1 to 7 run.
    EP97402057A 1996-09-04 1997-09-04 Ventilation apparatus for drying products,especially freshly formed products to be cured afterwards Expired - Lifetime EP0828126B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9610757 1996-09-04
    FR9610757A FR2752925B1 (en) 1996-09-04 1996-09-04 IMPROVED VENTILATION DEVICE FOR DRYING PRODUCTS, IN PARTICULAR RAW PRODUCTS INTENDED TO BE THEN COOKED

    Publications (2)

    Publication Number Publication Date
    EP0828126A1 EP0828126A1 (en) 1998-03-11
    EP0828126B1 true EP0828126B1 (en) 2001-05-23

    Family

    ID=9495415

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97402057A Expired - Lifetime EP0828126B1 (en) 1996-09-04 1997-09-04 Ventilation apparatus for drying products,especially freshly formed products to be cured afterwards

    Country Status (4)

    Country Link
    EP (1) EP0828126B1 (en)
    AT (1) ATE201505T1 (en)
    DE (1) DE69704914T2 (en)
    FR (1) FR2752925B1 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2967487A1 (en) * 2010-11-15 2012-05-18 Hatton Philippe Marcel Emilien Ventilation device for guiding and rectifying flow of air in ventilation apparatus to distribute drying air on stackings of e.g. bricks, in ceramic industry, has strips fixed perpendicular to plane, so that flow of air penetrates stacking

    Family Cites Families (9)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR22590E (en) * 1919-08-27 1921-07-23 Pilade Barducci System and apparatus for ventilation of drying chambers
    GB236998A (en) * 1924-04-14 1925-07-14 Drying Systems Inc Equalized distribution system for fluids
    FR699030A (en) * 1930-07-17 1931-02-09 Method and apparatus for drying objects by means of currents moving through the room
    US2852311A (en) * 1955-04-22 1958-09-16 Ind Ovens Inc Gas distributor head
    FR1191253A (en) * 1957-02-20 1959-10-19 Drying facility
    DE2554406A1 (en) * 1975-12-03 1977-06-08 Max Wagner Device for drying ceramic blanks - has air distribution device with built in heat exchange unit
    US4060914A (en) * 1976-08-18 1977-12-06 Proctor & Schwartz, Inc. Apparatus for treating material with a gaseous medium
    GB2039013B (en) * 1978-12-22 1983-02-16 Drytech Eng Ltd Drying apparatus
    DE2914243C3 (en) * 1979-04-09 1986-03-27 Keller Ofenbau GmbH, 4530 Ibbenbüren Plant for the rhythmic drying of ceramic moldings

    Also Published As

    Publication number Publication date
    FR2752925A1 (en) 1998-03-06
    ATE201505T1 (en) 2001-06-15
    EP0828126A1 (en) 1998-03-11
    DE69704914D1 (en) 2001-06-28
    FR2752925B1 (en) 1998-10-09
    DE69704914T2 (en) 2001-11-22

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