PatentDe  


Dokumentenidentifikation EP1407206 10.08.2006
EP-Veröffentlichungsnummer 0001407206
Titel TROCKNER FÜR GETREIDE UND KÖRNIGES GUT IM ALLGEMEINEN
Anmelder Agrex S.p.A., Villafranca Padovana, IT
Erfinder BARBIERI, Silvano, I-35010 Curtarolo, IT
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60212845
Vertragsstaaten AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, IE, IT, LI, LU, MC, NL, PT, SE, SK, TR
Sprache des Dokument EN
EP-Anmeldetag 04.07.2002
EP-Aktenzeichen 027623214
WO-Anmeldetag 04.07.2002
PCT-Aktenzeichen PCT/EP02/07426
WO-Veröffentlichungsnummer 2003008887
WO-Veröffentlichungsdatum 30.01.2003
EP-Offenlegungsdatum 14.04.2004
EP date of grant 28.06.2006
Veröffentlichungstag im Patentblatt 10.08.2006
IPC-Hauptklasse F26B 17/14(2006.01)A, F, I, 20051017, B, H, EP
IPC-Nebenklasse F26B 9/06(2006.01)A, L, I, 20051017, B, H, EP   F26B 23/02(2006.01)A, L, I, 20051017, B, H, EP   

Beschreibung[en]
TECHNICAL FIELD

The present invention relates to a dryer for cereals and granular materials in general according to the preamble of claim 1.

TECHNOLOGICAL BACKGROUND

The present invention finds a particular, although not exclusive, application in the field of mobile dryers, or rather those dryers which are stationed close to the cereal harvesting areas in order to dry the cereals on site and in a short time so as to avoid degradation thereof due principally to the moisture contained in the harvested cereal.

Dryers of the type indicated typically comprise a vertical cylindrical drying chamber adapted to contain the harvested cereal, and a heating unit including a bumer associated with a combustion chamber for the production of hot air to be introduced inside the drying chamber for the purpose of facilitating the evaporation of the moisture contained in the cereal being dried. A fan is conventionally provided for introducing the flow of air into the drying chamber in a central cavity separated from the stored cereal, for example by means of panels with perforated surface. From this central cavity the flow of hot air generated and mixed with the combustion gases is caused to penetrate into the layers of cereal present in the drying chamber, promoting the aforesaid drying process.

According to this type of dryer, the drying air is therefore heated at the combustion chamber, in order then to be conveyed inside the central cavity of the drying chamber. Moreover, the flow of air heated by the heating unit is introduced into the cavity mixed with the combustion gases which therefore come into contact with the cereal in the drying process.

A grain dryer having the feature according to the preamble of claim 1 is known from US 4341516. US 1361351 is directed to an air heater designed in general for use in connection with drying apparatus. US 2706345 is also prior art to the present invention, being directed to a vertical drier for grain. Another type of dryer provides for the use of a heat exchanger placed externally of the dryer, by means of which the flow of air is heated which is then conveyed inside the drying chamber.

DESCRIPTION OF THE INVENTION

A principal aim of the present invention is that of providing a dryer for cereals or similar materials, of an improved type capable of maximising the efficiency in the thermal exchange between the heat generated by the heating unit and that transferred to the flow of air responsible for the drying process, improving the overall output thereof.

Another aim is to produce a dryer which makes it possible to keep the flow of drying hot air separate from the combustion gases, preventing contact of the latter with the cereal, so safeguarding the characteristics of the cereal itself.

Yet another aim is to produce a dryer which improves the overall efficiency of the thermal exchange in order to obtain in fast times a high and homogenous degree of drying of the mass of cereal to be dried.

These and other aims which will become clear hereinafter are fulfilled, in accordance with the present invention, by a dryer having the characteristics described in the claims which follow.

BRIEF DESCRIPTION OF THE DRAWINGS

The characteristics and advantages of the invention will become clearer from the following detailed description of one of its preferred embodiments, supplied with reference to the appended drawings, provided by way of non-limiting example, wherein:

  • Figure 1 is a perspective view in partial section of a dryer produced according to the invention,
  • Figure 2 is a perspective view in partial section of a detail of the dryer of Figure 1,
  • Figure 3 is a perspective exploded view in partial section of the detail of Figure 2,
  • Figure 4 is a perspective view in partial section of a detail of Figure 3.

PREFERRED EMBODIMENT OF THE INVENTION

With initial reference to Figure 1, there is indicated as a whole by 1 a mobile dryer for cereals and other granular materials, produced in accordance with the present invention.

The dryer 1 comprises a drying chamber, indicated as a whole by 2, which consists of an upper main part 2a of cylindrical shape, and of a frustoconical lower hopper part 2b which ends in a delivery mouth 3 bearing a plate-type shutter with adjustable opening for partialising the quantity of cereal discharged.

The drying chamber 2 is mounted on a frame 4 with wheels 5 so that the dryer is mobile and transportable onto the cereal harvesting site where drying takes place.

Conveyor devices, preferably screw conveyors, are further provided for the functions of loading/unloading and also recirculating the cereal inside the drying chamber. More particularly, a horizontal screw conveyor 6 is provided, placed below the delivery mouth 3 and connected to a vertical screw conveyor 7.

The latter extends parallel to the vertical central axis X of the drying chamber 2, from the lower base of the chamber to the apex thereof, where there is disposed an inclined discharge pipe 8 by means of which the material which ascends from the vertical conveyor 7 can drop down again inside the chamber 2 or to the outside, in the discharge (emptying) phase of the dryer. A third screw conveyor 9 is provided for transferring the cereal at the point of connection of the conveyors 6 and 7.

The section of horizontal conveyor 6 extending between the delivery mouth 3 and the connection with the vertical conveyor 7 is further arranged to convey the material delivered by the mouth 3 and to transfer it, through the vertical screw 7 back inside the drying chamber to guarantee the recirculation of the cereal during the drying phase.

The dryer 1 also comprises a heating unit 10 including a bumer 11 associated with a combustion chamber 12 for heating a flow of air to be introduced into the drying chamber 2, as will appear more clearly in the continuation of the description, in order to promote drying of the cereal. Such a flow of air is generated by a fan 13 and is conveyed, through a duct 14, into the drying chamber and, more particularly, into a central cavity 15 of the chamber bounded by a bell 16 with perforated surface, for example formed by panelling 17 of perforated sheet metal adapted to keep the cavity separate from the cereal, but at the same time permitting the passage of the flow of air from the cavity in the direction of the layers of cereal stored in the dryer. Said central cavity 15 is coaxial with the drying chamber so that said bell 16 is surrounded by the cereal loaded into the drying chamber.

The combustion chamber 12 is mounted internally of the duct 14, coaxially therewith, and is extended as far as the inside of the central cavity 15 where it communicates with a further chamber 18 constituting a heat exchange device for heating the flow of drying air, as described in greater detail hereinafter. Said chamber 18 is bounded by a lateral wall 19a closed by opposed end walls 19b, 19c, all the walls defining respective surfaces for thermal exchange between the combustion gases conveyed inside the chamber 18 and the flow of drying air, generated by the fan, which flows along the outside of said walls.

It should be noted that the chamber 18 is produced so as to be sealed against the escape of the flue gases and their possible introduction into the drying chamber. To this end, the chamber 18 is provided with an inlet aperture 20 for the flue gases, communicating with the combustion chamber, and also with a plurality of outlet apertures 21 for the flue gases, connected to conveying means for the flue gases to transfer them to the outside of the drying chamber. Said conveying means comprise a plurality of tubular ducts 22 communicating at an axial end thereof with the chamber 18, and at the opposite end with a common manifold 23, connected in its turn to a flue gas discharge chimney, indicated by 24.

According to a preferred configuration, the ducts 22 are extended in a bundle around the combustion chamber 12 and are housed internally of the duct 14 so as to be assailed in a counterflow by the flow of air generated by the fan and directed into the drying chamber. The result is thus a further thermal exchange between the flue gases conveyed outside by the ducts 22 and the flow of drying air induced by the fan for pre-heating of said flow of air, exploiting the heat of the combustion gases directed to the discharge chimney.

For the purpose of increasing the thermal exchange principally by heat convection at the chamber 18, the latter is provided with further finned surfaces consisting, for example, of suitably shaped plate-like members 25 fixed to the lateral wall 19a so as to define passages for channelling the flow of drying air with an increase in the thermal exchange surface flowed over.

Tubular members are further provided, all indicated by 26, passing inside the chamber 18 and open at the opposed ends and also suitably secured to the lateral wall 19a, which are intended to be assailed by the hot combustion gases inside the chamber 18 to induce a thermal exchange between said gases and the flow of drying air conveyed in said tubular members for a further transfer of heat to the flow of air.

It should be observed that in the example described the chamber 18 has an approximately annular configuration comprising a central cylindrical opening 27 coaxial with the axis X, suitable for permitting the passage of a central shaft 28 for the actuation of mixing means 29 for mixing the cereal. It is understood that, if the dryer is provided with a central vertical conveyor of axis X, the cylindrical opening 27 is selected to be of such dimensions and shape as to allow the positioning of the conveyor. In dryers with vertical conveyor external to the drying chamber, such as that of the example described, the chamber 18 may alternatively be devoid of a central through opening or provide a reduced opening for the passage of transmission devices such as for example the aforesaid shaft 28. In the latter case, the surface of the cylindrical opening is also conveniently provided with further fins 30, for example in the form of profiles extending axially at a predetermined angular pitch, and adapted to increase the thermal exchange surface.

The lateral wall 19a of the chamber 18 is further provided with an indentation 31 defining, within the chamber itself, a pair of deflector surfaces 32a, 32b adapted to deflect the flow of hot flue gases introduced into the chamber, inducing internal circulatory motions to facilitate the transfer of heat to the walls of the chamber itself, maximising the relative thermal exchange.

Each duct 22 of the tube bundle which envelopes the combustion chamber 12 is further provided on the inside with a respective helical body 33, coaxial therewith. Preferably, such a body is in the shape of a double helix or rather is formed by a pair of superposed and angularly spaced helices which define, in each duct 22, a flow channel with a double-helical course in which the combustion gases are conveyed. The result is that the path travelled by the flue gases is much greater than the axial length of the duct and the flue gases are in contact more with the outer wall of the tubes, owing to the presence of the helical channel, and consequently there is a larger amount of heat transferred from the flue gases to the flow of air in counterflow, at a velocity and pressure kept substantially constant, thereby increasing the thermal exchange without any increase in the axial development of the tube bundle.

Provision is also made for the helical bodies 33 to be axially slidable in the corresponding ducts 22 and for this purpose they are provided with a respective manipulation handle 34 provided at the axial end of the body 33 facing towards the flue gas discharge manifold 23. In the manifold a ring of openings 35 coaxial with the tube bundle 22 is provided to permit the extraction and insertion of the helical bodies 33 from and into the respective ducts of the bundle.

The invention thus fulfils the aims proposed by obtaining numerous advantages with respect to the known solutions.

A principal advantage is that with the dryer according to the invention the efficiency of the thermal exchange in the heating of the drying air is increased, owing to the fact that the combustion and also the combustion gases are brought directly inside the drying chamber and collected in a chamber constituting a heat exchanger in which the thermal exchange is maximised. Tests conducted by the Applicant have shown a greater efficiency in the overall thermal exchange with respect to the known solutions.

A further advantage is that the heat of the hot combustion gases directed to the discharge chimney is effectively transferred to the flow of drying air for pre-heating of the flow itself, benefitting from a thermal exchange in counterflow.

A further advantage is that according to the invention the combustion gases are kept separate from the flow of drying air inside the drying chamber so as to avoid contact between the flue gases and combustion products and the cereal, preserving the characteristics and properties of the latter.

A still further advantage is that the efficiency of the thermal exchange in counterflow between the flue gases conveyed in the bundle of discharge ducts and the flow of air generated by the fan is increased owing to the helical flow channels provided within the ducts, which also make it possible to limit advantageously the overall axial dimensions of the tube bundle, reducing the overall size of the dryer.

A further advantage is that the application of the exchanger does not involve structural and dimensional changes to the dryer, thus allowing its application to existing machines, and also the containment of the production costs. Moreover, the overall dimensions do not change, thus keeping the transport costs unaltered.


Anspruch[de]
Trockner für Getreide und körniges Material im Allgemeinen, umfassend: - eine Trocknungskammer (2) geeignet zum Aufnehmen des zu trocknenden Getreides und des körnigen Materials im Allgemeinen, - eine Erwärmungseinheit (10) mit einem Brenner (11) dem eine Verbrennungskammer (12) zum Erwärmen eines Luftstroms zugeordnet ist, der in die Trocknungskammer (2) zum Trocknen des Getreides und des körnigen Materials im Allgemeinen eingeführt werden soll, - eine weitere Kammer (18) angeordnet in der Trocknungskammer (2), so dass sie von der Masse an zu trocknendem Getreide und körnigem Material im Allgemeinen umgeben ist, wobei sich die Kammer (18) in Verlängerung und in Kommunikation mit der Verbrennungskammer (12) der Erwärmungseinheit (10) in solcher Weise erstreckt, dass sie eine Wärmeaustauscheinrichtung zum Erwärmen der Trocknungsluft bildet, - einen Kanal (14), durch den der Strom von Trocknungsluft in einen zentralen Hohlraum (15) der Trocknungskammer befördert wird, wobei der zentrale Hohlraum von einer Glocke mit perforierter Oberfläche begrenzt wird, die die Kammer (18) umgibt, die den Wärmeaustauscher bildet, um den Hohlraum (15) vom Getreide und dem körnigen Material im Allgemeinen getrennt zu halten, aber gleichzeitig den Durchtritt des Luftstroms vom Hohlraum in Richtung des Getreides und des körnigen Materials im Allgemeinen zu erlauben, die im Trockner gelagert sind, dadurch gekennzeichnet, dass die Kammer (18), die den Wärmeaustauscher bildet, gegen das Eindringen von Verbrennungsgasen in die Trocknungskammer (2) abgedichtet ist, so dass die Verbrennungsgase deshalb direkt in die Trocknungskammer getrennt vom Trocknungsluftstrom eingebracht werden,

und dadurch, dass der zentrale Hohlraum koaxial zur Trocknungskammer ist.
Trockner nach Anspruch 1, worin die Trocknungskammer (2) einen oberen Teil im Wesentlichen in zylindrischer Form umfasst, wobei die Kammer (18), die den Wärmeaustauscher bildet, zur Trocknungskammer koaxial ist. Trockner nach Anspruch 1 oder 2, worin die Kammer (18), die den Wärmeaustauscher bildet, durch Wände (19a, 19b, 19c) begrenzt ist, die Oberflächen für Wärmeaustausch zwischen den Verbrennungsgasen, die in die Kammer (18) befördert werden, und dem Trocknungsluftstrom der entlang der Außenseite der Oberflächen (19a, 19b, 19c) strömt, definieren. Trockner nach Anspruch 3, worin die Wände ferner mit strukturierten Oberflächen (25) versehen sind, die geeignet sind, den thermischen Austausch in der Austauschervorrichtung zu erhöhen. Trockner nach einem oder mehreren der vorhergehenden Ansprüche, worin rohrförmige Elemente (26) vorgesehen sind, die in der Kammer (18) verlaufen und von den Verbrennungsgasen angegangen werden können, so dass thermischer Austausch zwischen den Gasen und dem Trocknungsluftstrom induziert wird, der in den rohrförmigen Elementen (26) zum Erwärmen der Luft befördert wird. Trockner nach einem oder mehreren der vorhergehenden Ansprüche, worin die Kammer (18), die den Wärmeaustauscher bildet, eine erste Einlassöffnung (20) für die Abgase umfasst, die direkt mit der Verbrennungskammer (12) verbunden ist, und mindestens eine zweite Auslassöffnung (21) für die Abgase verbunden mit Mitteln (22) zum Befördern der Abgase aus der Trocknungskammer (2). Trockner nach Anspruch 6, worin das Beförderungsmittel mindestens einen rohrförmigen Kanal (22) mit gegenüberliegenden Enden umfasst, die mit der Kammer (18) verbunden sind, die den Wärmeaustauscher bildet, und mit einem Abgasableitkamin (24). Trockner nach Anspruch 7, worin eine Mehrzahl der rohrförmigen Kanäle (22) vorgesehen ist, um die Abgase in den Kamin (24) zu befördern, außerhalb der Trocknungskammer (2). Trockner nach Anspruch 8, worin die Kanäle (22) sich in einem Bündel um die Verbrennungskammer (12) erstrecken und mit einer Verteilervorrichtung (23) verbunden sind, die mit dem Abgasableitkamin (24) kommuniziert. Trockner nach Anspruch 9, worin das Bündel Kanäle (22) in einer Position derart angeordnet ist, dass sie im Gegenstrom von einem Luftstrom angegangen werden, der von einem Lüftermittel erzeugt ist, für einen thermischen Austausch zwischen den Abgasen und dem Luftstrom, so dass der in die Trocknungskammer (2) eingeführte Luftstrom vorgewärmt wird. Trockner nach einem der Ansprüche 7 bis 10, worin Mittel vorgesehen sind, um den von den Abgasen in jedem der Kanäle (22) des Bündels zurückgelegten Weg zu verlängern, so dass der thermische Austausch zwischen den Abgasen und dem Luftstrom, der vom Lüftermittel in einem Gegenstrom zu den Verbrennungsgasen geschickt wird, erhöht wird. Trockner nach Anspruch 11, worin die Mittel jeweils einen schraubenförmigen Körper (33) umfassen, der koaxial in jedem der Kanäle untergebracht ist, um einen Strömungskanal mit schraubenförmigem Verlauf entlang der axialen Erstreckung der Kanäle (22) zu definieren. Trockner nach Anspruch 12, worin jeder der schraubenförmigen Körper (33) entfernbar im jeweiligen Kanal (22) angebracht ist. Trockner nach Anspruch 12 oder 13, worin jeder der schraubenförmigen Körper (33) im jeweiligen Kanal (22) axial verschiebbar ist. Trockner nach einem der Ansprüche 12 bis 14, worin jeder der schraubenförmigen Körper (33) mit einem entsprechenden Handhabungsgriff (34) versehen ist, der sich vom Ende des Körpers (33) erstreckt, das dem Ableitkamin (24) für die Verbrennungsgase zugewandt ist.
Anspruch[en]
A dryer for cereals and granular materials in general, comprising: - a drying chamber (2) adapted to contain the cereal and granular materials in general to be dried, - a heating unit (10) including a burner (11) associated with a combustion chamber (12) for heating a flow of air to be introduced into said drying chamber (2) for drying the cereal and granular materials in general, - a further chamber (18) disposed within the drying chamber (2) so as to be surrounded by the mass of cereal and granular materials in general to be dried, said chamber (18) extending in prolongation of and in communication with the combustion chamber (12) of the heating unit (10), in such a manner as to constitute a heat exchange device for heating the drying air, - a duct (14) through which the flow of drying air is conveyed into a central cavity (15) of the drying chamber, said central cavity being bounded by a bell with perforated surface surrounding the chamber (18) constituting the heat exchanger, to keep the cavity (15) separate from the cereal and granular materials in general, but at the same time permitting the passage of the flow of air from the cavity in the direction of the cereal and granular materials in general stored in the dryer, characterized in that the chamber (18) constituting the heat exchanger is sealed against the introduction of the combustion gases into the drying chamber (2), the combustion gases being therefore brought directly inside the drying chamber separated from the flow of drying air,

and in that said central cavity being coaxial with the drying chamber.
A dryer according to claim 1, wherein the drying chamber (2) comprises an upper part substantially of cylindrical shape, said chamber (18) constituting said heat exchange device being coaxial with the drying chamber. A dryer according to claim 1 or 2, wherein said chamber (18) constituting the heat exchanger is bounded by walls (19a, 19b, 19c) defining surfaces for thermal exchange between the combustion gases conveyed inside said chamber (18) and the flow of drying air which flows along the outside of said surfaces (19a, 19b, 19c). A dryer according to claim 3, wherein said walls are provided with further finned surfaces (25) adapted to increase the thermal exchange in said exchange device. A dryer according to one or more of the preceding claims, wherein tubular members (26) are provided, passing inside said chamber (18) and capable of being assailed by the combustion gases so as to induce a thermal exchange between said gases and the flow of drying air conveyed in said tubular members (26) for heating said air. A dryer according to one or more of the preceding claims, wherein the chamber (18) constituting said exchanger comprises a first, inlet opening (20) for the flue gases, communicating directly with the combustion chamber (12), and at least one second, outlet opening (21) for the flue gases, communicating with means (22) for conveying said flue gases to the outside of the drying chamber (2). A dryer according to claim 6, wherein said conveying means comprises at least one tubular duct (22) having opposed ends communicating with said chamber (18) constituting the heat exchanger and with a flue gas discharge chimney (24). A dryer according to claim 7, wherein a plurality of said tubular ducts (22) is provided for conveying the flue gases into said chimney (24), outside the drying chamber (2). A dryer according to claim 8, wherein said ducts (22) extend in a bundle around the combustion chamber (12) and are connected to a manifold device (23) communicating with the flue gas discharge chimney (24). A dryer according to claim 9, wherein said bundle of ducts (22) is disposed in a position such as to be assailed in counterflow by a flow of air generated by fan means, for a thermal exchange between said flue gases and said flow of air so as to pre-heat the flow of air introduced into said drying chamber (2). A dryer according to one of claims 7 to 10, wherein means are provided for extending the path travelled by the flue gases in each of the ducts (22) of said bundle so as to increase the thermal exchange between said flue gases and the flow of air sent by said fan means in a counterflow to said combustion gases. A dryer according to claim 11, wherein said means comprise a respective helical body (33) housed coaxially in each of said ducts so as to define a flow channel with helical course along the axial development of said ducts (22). A dryer according to claim 12, wherein each of said helical bodies (33) is removably mounted in the respective duct (22). A dryer according to claim 12 or 13, wherein each of said helical bodies (33) is axially slidable in the respective duct (22). A dryer according to one of claims 12 to 14, wherein each of said helical bodies (33) is provided with a respective manipulation handle (34) extended from the end of said body (33) facing towards the discharge chimney (24) for the combustion gases.
Anspruch[fr]
Séchoir pour des céréales et des matières en grains en général, comportant : - une chambre de séchage (2) prévue pour contenir les céréales et les matières en grains en général devant être séchées, - une unité de chauffage (10) comprenant un brûleur (11) associé à une chambre de combustion (12) afin de chauffer un écoulement d'air devant être introduit dans ladite chambre de séchage (2) afin de sécher les céréales et les matières en grains en général, - une chambre supplémentaire (18) disposée à l'intérieur de la chambre de séchage (2) de façon à être entourée par la masse de céréales et de matières en grains en général devant être séchées, ladite chambre (18) s'étendant dans le prolongement de et en communication avec la chambre de combustion (12) de l'unité de chauffage (10), de manière à constituer un dispositif d'échange de chaleur destiné à chauffer l'air de séchage, - une conduite (14) à travers laquelle l'écoulement d'air de séchage est transporté dans une cavité centrale (15) de la chambre de séchage, ladite cavité centrale étant délimitée par une cloche avec une surface perforée qui entoure le chambre (18) constituant l'échangeur de chaleur, afin de maintenir la cavité (15) séparée des céréales et des matières en grains en général, mais en permettant dans le même temps le passage de l'écoulement d'air depuis la cavité dans la direction des céréales et des matières en grains en général stockées dans le séchoir, caractérisé en ce que la chambre (18) constituant l'échangeur de chaleur est obturée à l'encontre de l'introduction des gaz de combustion dans la chambre de séchage (2), les gaz de combustion étant par conséquent amenés directement à l'intérieur de la chambre de séchage séparés de l'écoulement d'air de séchage, et en ce que ladite cavité centrale est coaxiale à la chambre de séchage. Séchoir selon la revendication 1, dans lequel la chambre de séchage (2) comprend une partie supérieure de forme sensiblement cylindrique, ladite chambre (18) constituant ledit dispositif d'échange de chaleur qui est coaxial à la chambre de séchage. Séchoir selon la revendication 1 ou 2, dans laquelle ladite chambre (18) constituant l'échangeur de chaleur est délimitée par des parois (19a, 19b, 19c) définissant des surfaces pour l'échange thermique entre les gaz de combustion transportés à l'intérieur de ladite chambre (18) et l'écoulement d'air de séchage qui s'écoule le long de l'extérieur desdites surfaces (19a, 19b, 19c). Séchoir selon la revendication 3, dans lequel lesdites parois sont pourvues en outre de surfaces à ailettes (25) prévues pour augmenter l'échange thermique dans ledit dispositif d'échange. Séchoir selon une ou plusieurs des revendications précédentes, dans lequel des éléments tubulaires (26) sont prévus, à l'intérieur de ladite chambre (18) et peuvent être attaqués par les gaz de combustion de façon à induire un échange thermique entre lesdits gaz et l'écoulement d'air de séchage transporté dans lesdits éléments tubulaires (26) afin de chauffer ledit air. Séchoir selon une ou plusieurs des revendications précédentes, dans lequel la chambre (18) constituant ledit échangeur comprend une première ouverture d'entrée (20) pour les gaz d'échappement, directement en communication avec la chambre de combustion (12), et au moins une deuxième ouverture de sortie (21) pour les gaz d'échappement, en communication avec des moyens (22) destinés à transporter lesdits gaz d'échappement vers l'extérieur de la chambre de séchage (2). Séchoir selon la revendication 6, dans lequel lesdits moyens de transport comportent au moins une conduite tubulaire (22) ayant des extrémités opposées qui communiquent avec ladite chambre (18) constituant l'échangeur de chaleur et avec une cheminée d'évacuation de gaz d'échappement (24). Séchoir selon la revendication 7, dans lequel une multiplicité de dites conduites tubulaires (22) est prévue pour transporter les gaz d'échappement dans ladite cheminée (24), à l'extérieur de la chambre de séchage (2). Séchoir selon la revendication 8, dans lequel lesdites conduites (22) s'étendent dans un faisceau autour de la chambre de combustion (12) et sont reliées à un dispositif collecteur (23) qui communique avec la cheminée d'évacuation de gaz d'échappement (24). Séchoir selon la revendication 9, dans lequel ledit faisceau de conduites (22) est disposé dans une position telle qu'il est attaqué à contre-courant par un écoulement d'air généré par des moyens de ventilateur, pour un échange thermique entre lesdits gaz d'échappement et ledit écoulement d'air de façon à préchauffer l'écoulement d'air introduit dans ladite chambre de séchage (2). Séchoir selon l'une des revendications 7 à 10, dans lequel des moyens sont prévus afin d'étendre le passage suivi par les gaz d'échappement dans chacune des conduites (22) dudit faisceau de façon à augmenter l'échange thermique entre lesdits gaz d'échappement et l'écoulement d'air envoyé par lesdits moyens de ventilateur à contre-courant desdits gaz de combustion. Séchoir selon la revendication 11, dans lequel lesdits moyens comprennent un corps hélicoïdal respectif (33) logé coaxialement dans chacune desdites conduites de façon à définir un canal d'écoulement avec un trajet hélicoïdal le long du développement axial desdites conduites (22). Séchoir selon la revendication 12, dans lequel chacun desdits corps hélicoïdaux (33) est monté de manière amovible dans la conduite (22) respective. Séchoir selon la revendication 12 ou 13, dans lequel chacun desdits corps hélicoïdaux (33) peut coulisser axialement dans la conduite (22) respective. Séchoir selon l'une des revendications 12 à 14, dans lequel chacun desdits corps hélicoïdaux (33) est pourvu d'une poignée de manipulation (34) respective s'étendant depuis l'extrémité dudit corps (33) en étant orienté vers la cheminée d'évacuation (24) pour les gaz de combustion.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
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