EP2192366B1 - Device for radiating a substrate - Google Patents

Device for radiating a substrate Download PDF

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Publication number
EP2192366B1
EP2192366B1 EP09171971.6A EP09171971A EP2192366B1 EP 2192366 B1 EP2192366 B1 EP 2192366B1 EP 09171971 A EP09171971 A EP 09171971A EP 2192366 B1 EP2192366 B1 EP 2192366B1
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EP
European Patent Office
Prior art keywords
cooling
lamp
fan
housing
reflector
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EP09171971.6A
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German (de)
French (fr)
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EP2192366A2 (en
EP2192366A3 (en
Inventor
Asmir Semanic
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Uviterno AG
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Uviterno AG
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Publication of EP2192366A2 publication Critical patent/EP2192366A2/en
Publication of EP2192366A3 publication Critical patent/EP2192366A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B41F23/0406—Drying webs by radiation
    • B41F23/0409—Ultraviolet dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/045—Drying sheets, e.g. between two printing stations by radiation
    • B41F23/0453—Drying sheets, e.g. between two printing stations by radiation by ultraviolet dryers

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • a device is for example from the US-A-5,094,010 known.
  • the lamp housing is flowed through in the longitudinal direction with cooling air.
  • This undoubtedly gives rise to a temperature gradient across the length of the housing, i. the cooling air enters the housing substantially cool and becomes hotter as it progresses.
  • this cooling channels are also provided, which are arranged above the lamp, but it is clear that these cooling channels are heated by the voltage applied to the reflector on them.
  • coolants are supplied from somewhere outside, which does not make the thing more compact. Rather, powerful blowers or pumps are needed to keep the coolant in circulation. Of course, that makes the entire device more expensive. Since the coolant is circulated - whereby the blowing off of the cooling air or the discharge of the cooling water is avoided - a further cooling device must be provided, because otherwise the recycled heated cooling gas (in the last part of his path, the cooling fluid can not do much ) acted as a heating medium and not as a coolant.
  • JP 2007 109506 and D2 JP 2002 235942 describe further solutions in which cooling air is sucked from the bottom of the lamp passing through an upper opening of the reflector and by a cooling device and then flows downwards.
  • the blowing power is divided into at least two units, the units can have smaller and cheaper engines, the cooling is made uniform and also a modular structure, as provided in particular in claim 2 under protection, is facilitated.
  • a box-like housing 1 with side walls, a cover and a bottom wall is shown.
  • the housing may have guide rails or other guide elements 6 in order to be able to insert it into a frame which, for example, also comprises a transport device for flat material, such as printed paper.
  • the housing is completely closed, because the bottom wall carries a UV-transparent plate 2 in order to pass the light of a UV lamp 3 with a longitudinal axis A.
  • the UV lamp 3 in a known manner by a two-part - but possibly also one-piece or multi-part - reflector 4 is surrounded.
  • the reflector itself can also be designed as a so-called shutter (movable light shutter), or a separate shutter (not shown) can be provided.
  • a cooling liquid which in a conventional manner by a liquid reservoir by means of a Pump (not shown) is pumped through.
  • a (not shown heat exchanger is provided in this cooling fluid circuit to cool the liquid, on the other hand, but also supply the extracted heat a useful purpose.
  • a, for example, slot-shaped, channel 7 is provided, through which cooling air flows to the UV lamp 3 transversely to its axis A.
  • This cooling air is supplied by a schematically indicated blower unit 8, which according to Fig. 2 is designed as a box-like module of limited size.
  • the blower unit 8 comprises a motor (not shown) together with the fan (or a radial fan), as a result of the limited size, the motor can be of small size with low power consumption, which in turn requires at least two depending on the length of the elongated UV lamp but in some cases also several such blower units, which in turn ensures that the UV lamp is cooled quite uniformly and vigorously over its entire length without temperature gradients occurring along the lamp 3.
  • the respective blower units 8 can each be inserted into the housing 1, as is the case Fig. 2 emerges showing a support plate 9, which is either equipped with several modules 8 or approximately along the dashed line 10 is divided, each module 8 is assigned a separate support plate 9.
  • the presentation of the Fig. 1 is similar and shows two guide rails 11, in which a respective blower unit 8 via an approximately V-shaped cover plate 9a is inserted.
  • the respective blower unit 8 is connected at its bottom directly with air guide means, in which case then the whole unit, for example, in grooves 12 of the housing 1 can be inserted.
  • the whole unit for example, in grooves 12 of the housing 1 can be inserted.
  • both the grooves 12 and the guide rails 11 are provided. In any case, one achieves such a simple, rapid and cost-effective installation.
  • the above-mentioned air guide means comprise the channel 7, above which a deflecting body 13 is arranged, the coming of the fan 8 cooling air in two equally large channels deflects 14, but at the same time also ensures that the fan 8 is not directly exposed to the radiant heat of the UV lamp 3.
  • This deflecting body preferably has a roof edge-like with the tip directed against the fan surface, so that there is a low flow resistance and the air is divided evenly into the channels 14.
  • the deflecting body 13 is preferably hollow and, like the mentioned cooling channels 5, supplied with a coolant which flows either through the same cooling circuit as that of the channels 5 or through a separate cooling circuit.
  • the relatively large space 17 available within a hollow baffle 13 may also be used to provide a vaporizable coolant, e.g. Freon, as used in refrigerators, to use.
  • the cooling air, blown down from the fan 8 flows through the deflection channels 14 and into the channel 7.
  • This channel 7, when not connected to the fan 8, can extend over the entire length of the UV lamp 3, in FIG In which case, however, its boundary walls must each be adapted to this length. If, however, the channel 7 part of the fan module or firmly connected to him, then here also eliminates the custom-made, because only one module 7, 8, 13, 14 etc. needs to be ranked at the other.
  • the cooling air As soon as the cooling air has left the channel 7, it passes over the UV lamp 3 and along the surfaces of the reflector 4, at the bottom of which it exits. However, since the air has warmed in the course of this path, it has the tendency to ascend again after exiting the reflector 4, where the space of the housing 1 widens. In this case, the air inevitably flows at the top of the reflectors 4 (where the cooling channels 5 are) and along the side walls of the housing 1 (which may also be cooled with a cooling liquid if desired) between a cooling fin arrangement 15 of a heat exchanger having cooling channels 5 '.
  • the cooling fins may be transverse to the plane of the drawing or in and parallel to the plane of the drawing Fig. 1 extend.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Coating Apparatus (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung nach dem Oberbegriff des Anspruches 1. Eine derartige Vorrichtung ist beispielsweise aus der US-A-5,094,010 bekannt geworden.The invention relates to a device according to the preamble of claim 1. Such a device is for example from the US-A-5,094,010 known.

Bei einer solchen Vorrichtung treten - trotz einer an sich recht intensiven Kühlung - zahlreiche Nachteile auf. Zum einen wird das Lampengehäuse in Längsrichtung mit Kühlluft durchströmt. Dies ergibt fraglos einen Temperaturgradienten über die Länge des Gehäuses, d.h. die Kühlluft tritt im wesentlichen kühl in das Gehäuse ein und wird im Laufe ihres Weges immer heisser. Zwar sind dazu auch noch Kühlkanäle vorgesehen, welche oberhalb der Lampe angeordnet sind, doch ist klar, dass auch diese Kühlkanäle durch die über den an ihnen anliegenden Reflektor aufgeheizt werden.In such a device occur - despite a rather intense cooling itself - numerous disadvantages. On the one hand, the lamp housing is flowed through in the longitudinal direction with cooling air. This undoubtedly gives rise to a temperature gradient across the length of the housing, i. the cooling air enters the housing substantially cool and becomes hotter as it progresses. Although this cooling channels are also provided, which are arranged above the lamp, but it is clear that these cooling channels are heated by the voltage applied to the reflector on them.

Ein weiterer Nachteil liegt darin, dass die Kühlmittel von irgendwo von aussen zugeführt werden, was die Sache nicht kompakter macht. Vielmehr sind kräftige Gebläse bzw. Pumpen nötig, um die Kühlmittel im Umlauf zu halten. Das verteuert natürlich die gesamte Vorrichtung. Da die Kühlmittel im Umlauf geführt sind - wodurch das Abblasen der Kühlluft bzw. das Ablassen des Kühlwassers vermieden wird - muss eine weitere Kühleinrichtung vorgesehen sein, weil sonst ja das rückgeführte aufgeheizte Kühlgas (im letzten Teil seines Weges kann das Kühlfluid auch nicht mehr viel bewirken) als Heizmittel und nicht als Kühlmittel wirkte.Another disadvantage is that the coolants are supplied from somewhere outside, which does not make the thing more compact. Rather, powerful blowers or pumps are needed to keep the coolant in circulation. Of course, that makes the entire device more expensive. Since the coolant is circulated - whereby the blowing off of the cooling air or the discharge of the cooling water is avoided - a further cooling device must be provided, because otherwise the recycled heated cooling gas (in the last part of his path, the cooling fluid can not do much ) acted as a heating medium and not as a coolant.

Ausserdem ist diese Anordnung recht kompliziert, wenn man bedenkt, dass das Lampengehäuse die aufgesetzte Kühlung und auch noch die Luft- und Wasserversorgung trägt, welch letztere sogar in doppelter Form vorliegt. Diese Komplexizität des Aufbaues führt aber auch dazu, dass die Montage (Erstmontage, Reparaturmontage) schwierig und teuer wird.Moreover, this arrangement is quite complicated, bearing in mind that the lamp housing carries the patch cooling and also the air and water supply, the latter even being in duplicate. However, this complexity of the structure also leads to the fact that the assembly (initial assembly, repair assembly) is difficult and expensive.

Aus der US-5,945,680 ist ein UV-Lampengehäuse mit Kühlkanälen vorgesehen, bei dem sich eine Luftströmung quer zur Lampenachse durch blosse Konvektion ergeben soll. Ein zwangsweiser Kühlluftumlauf ist aber nicht vorgesehen, und da die Kühlkanäle relativ weit von der Lampe entfernt sind, ist das Kühlungsergebnis mager.From the US 5,945,680 a UV lamp housing with cooling channels is provided, in which an air flow should result across the lamp axis by mere convection. A forced cooling air circulation is not provided, and since the cooling channels are relatively far away from the lamp, the cooling result is lean.

Auch ist eine ähnliche Konstruktion aus der US 6,646,278 bekannt, bei der Kühlluft an der Lampe vorbei gesaugt und dann über Mantelkanäle des Gehäuses zurück gedrückt wird. Da die Mantelkanalwände von der Lampe her aufgeheizt werden, geht ein Teil des Kühleffektes für die eben erst wieder abgekühlte Luft verloren. Ausserdem ist dies eine ziemlich platzaufwendige Konstruktion, was nicht nur für die Aufstellung der Vorrichtung unangenehm ist, sondern auch den Kühlwirkungsgrad beeinträchtigt, da der grössere Raum auch eine grössere Luftumwälzung bedingt.Also, a similar construction is from the US 6,646,278 known to be sucked past the cooling air on the lamp and then pushed back over jacket channels of the housing. Since the jacket duct walls are heated up by the lamp, part of the cooling effect is lost for the air which has just cooled down again. In addition, this is a rather space-consuming construction, which is not only unpleasant for the installation of the device, but also affects the cooling efficiency, since the larger space also causes a larger air circulation.

JP 2007 109506 und D2 JP 2002 235942 beschreiben weitere Lösungen bei denen Kühlluft von unten an der Lampe vorbei durch eine obere Öffnung des Reflektors sowie durch eine Kühleinrichtung gesaugt wird und anschliessend nach unten strömt. JP 2007 109506 and D2 JP 2002 235942 describe further solutions in which cooling air is sucked from the bottom of the lamp passing through an upper opening of the reflector and by a cooling device and then flows downwards.

Es ist daher Aufgabe der Erfindung, eine Vorrichtung der eingangs genannten Art so auszubilden, dass eine einfachere, kostgünstigere und vor allem auch wirksamere Kühlung erreicht wird. Dies wird durch die kennzeichnenden Merkmale des Anspruches 1 erreicht. Zum Kühlen von UV-Lampen quer zur Längsachse - was also die Bildung von Temperaturgradienten weitgehend vermeidet - ist es beispielsweise aus der EP 0 985 121 B1 bereits bekannt geworden, oberhalb der UV-Lampe, und etwa in deren Mitte, eine Öffnung im Gehäuse vorzusehen, an welche der Schlauch eine Gebläses für die Zufuhr von Kühlluft angeschlossen ist. Dies mag für relativ kurze Lampen, wie sie die EP zeigt, genügen, doch bei längeren UV-Lampen, wie sie mehr und mehr verwendet werden, ergibt sich eine sehr ungleichmässige Verteilung der zugeführten Luft. Dazu kommt, dass durch den langen Führungsweg auch noch relativ viel Energie verloren geht, so dass ein ziemlich grosses und Energie fressendes Gebläse verwendet werden muss. Ferner tritt hinzu, dass die Schlauchführung natürlich stets eine Behinderung bzw. Gefährdung des Bedienungspersonals darstellt, das sich gegebenenfalls darin verheddern kann. Überdies ist - um ein gezieltes Strömen der Luft zu sichern - auch noch ein Absauggebläse vorgesehen, welches zusätzliche Kosten verursacht und dann die energetisch angereicherte Luft nach aussen bläst.It is therefore an object of the invention to provide a device of the type mentioned in such a way that a simpler, more cost-effective and above all more effective cooling is achieved. This is achieved by the characterizing features of claim 1. For cooling UV lamps transversely to the longitudinal axis - which thus largely avoids the formation of temperature gradients - it is for example from the EP 0 985 121 B1 already known, above the UV lamp, and approximately in the center to provide an opening in the housing, to which the hose is connected to a blower for the supply of cooling air. This may be enough for relatively short lamps as the EP shows, but longer UV lamps, as they are more and more used, result in a very uneven distribution of the supplied air. On top of that, the relatively long way to travel also means that a relatively large amount of energy is lost, so a fairly large and energy-guzzling blower must be used. It also adds that the hose guide, of course, always represents a disability or danger to the operating personnel, which may possibly get tangled up in it. Moreover, in order to ensure a targeted flow of air - even a suction fan provided, which causes additional costs and then blows the energetically enriched air to the outside.

Dies gilt analog auch für die Konstruktion nach der EP 0 830 217 B1 , bei der eine relativ schmale Düse (mit grossem Strömungswiderstand und daher grossem Energieverbrauch) oberhalb der Lampe Kühlluft einbläst. Für die Zufuhr dieser Kühlluft von aussen ist eine Spülgasleitung vorgesehen, welche im allgemeinen als Schlauch ausgebildet ist, so dass dieselben Nachteile gelten, wie sie oben beschrieben wurden.This also applies analogously to the construction according to the EP 0 830 217 B1 , in which a relatively narrow nozzle (with high flow resistance and therefore high energy consumption) above the lamp blows cooling air. For the supply of this cooling air from the outside, a purge gas line is provided, which is generally formed as a hose, so that the same disadvantages apply, as described above.

Durch die Erfindung und ihre weitere Ausführungsformen ergeben sich aber mehrere Vorteile:

  • Vor allem ergeben sich über die Länge der Lampe praktisch keine Temperaturgradienten, weil überall gleichmässig gekühlt wird;
  • da die Luftführung an den Wandungen des Reflektors vorbei und wieder zum Gebläse geführt wird, kann auch der Reflektor gekühlt werden, ohne etwa von Wandungen eines Mantelkanals abgeschirmt zu sein, doch weist dieser Reflektor vorzugsweise mindestens einen Kühlfluidkanal auf so, dass der Luftstrom weiter gekühlt wird;
  • dabei ergibt sich damit ein ziemlich kompakter- und so auch kühlungswirksamer Aufbau;
  • das Kühlgas strömt, vorzugsweise unter etwa 90° zur Lampenachse, um die Lampe und nimmt von ihr Wärme auf, wird aber gleich danach durch den - wie oben erläutert - vorzugsweise gekühlten Reflektor wieder etwas abgekühlt, d.h. durch die Fluidkühlung des Strahlkopfes kann die gesamte Kühlluft zum Kühlen der Lampe ausgenutzt werden;
  • durch die Tatsache, dass Umluft (oder-gas) verwendet wird, ist die Gefahr gebannt, dass mit der Luft Staub in das Gehäuse eingetragen wird;
  • durch die Strömungsführung des Kühlgases werden sich erweiternde Kammern vermieden, welche die Strömung im Warmbereich verlangsamen und dadurch den Abtransport der Wärme behindern;
  • mit dem Druckgebläse kann also kühle Luft mit relativ hoher Geschwindigkeit an die Lampe gebracht werden, was beim Ansaugen der Luft durch ein über ihr gelegenes Gebläse nicht möglich wäre;
  • als gesonderte Einheiten sind diese, z.B. für eine Reparatur, jederzeit leicht austauschbar.
However, the invention and its further embodiments have several advantages:
  • Above all, there are practically no temperature gradients over the length of the lamp because cooling is uniform everywhere;
  • since the air duct is guided past the walls of the reflector and back to the blower, and the reflector can be cooled without being shielded by walls of a jacket channel, but this reflector preferably has at least one cooling fluid channel so that the air flow is further cooled ;
  • this results in a rather compact and so cooling effective construction;
  • the cooling gas flows, preferably at about 90 ° to the lamp axis, around the lamp and absorbs heat from it, but then immediately thereafter slightly cooled by the - as explained above - preferably cooled reflector, ie by the fluid cooling of the jet head, the entire cooling air be used to cool the lamp;
  • the fact that circulating air (or gas) is used eliminates the risk of dust being introduced into the housing with the air;
  • by the flow guidance of the cooling gas expanding chambers are avoided, which slow the flow in the warm area and thereby hinder the removal of heat;
  • with the pressure fan so cool air can be brought to the lamp at a relatively high speed, which would not be possible when sucking in the air through a blower located above it;
  • as separate units, these are easily replaceable at any time, eg for a repair.

Im Vergleich zum Stand der Technik erhält man überdies erfindungsgemäss zum Kühlen der UV-Lampe mindestens zwei quer zur Längsachse blasende Einheiten mit je einem Gebläse vorgesehen, d.h. die Blasleistung wird auf mindestens zwei Einheiten aufgeteilt, wobei die Einheiten kleinere und billigere Motoren haben können, die Kühlung vergleichmässigt wird und überdies ein modularer Aufbau, wie er insbesondere in Anspruch 2 unter Schutz gestellt ist, erleichtert wird.In comparison with the prior art, moreover, according to the invention, for cooling the UV lamp, at least two units blowing transversely to the longitudinal axis, each with a blower, are provided, that is to say in accordance with the invention. the blowing power is divided into at least two units, the units can have smaller and cheaper engines, the cooling is made uniform and also a modular structure, as provided in particular in claim 2 under protection, is facilitated.

Ein solcher modularer Aufbau hat mehrere Vorteile, denn einerseits lassen sich mit der entsprechenden Anzahl von Gebläseeinheiten die unterschiedlichsten Längen von UV-Lampen gleichmässig kühlen, so dass auch in der Lagerhaltung ein Vorteil entsteht, denn es müssen nun nicht mehr je nach Grösse unterschiedliche Kühlaggregate bereitgestellt werden. Die bevorzugte Ausführung nach Anspruch 2 gestattet es zudem, die Montage dieser Einheiten rasch und kostengünstig zu gestalten.Such a modular design has several advantages, because on the one hand, with the appropriate number of fan units, the different lengths of UV lamps can cool evenly, so that an advantage also arises in the storage, because it no longer has to provide different cooling units depending on the size become. The preferred embodiment according to claim 2 also makes it possible to make the assembly of these units quickly and inexpensively.

Sind fluidgekühlte Flächen mit Kühlkanälen, gewissermassen als Wärmetauscher, am Wege des Kühlgases zwischen dem Ausgang des Reflektors und dem Gebläse vorgesehen, dann gelangt gekühlte Luft im Umlauf zum jeweiligen Gebläse, insbesondere einem Radialgebläse, so dass dieses einer geringeren Wärmebelastung unterliegt und die Luft für einen erneuten Kühlzyklus bereit gemacht wird.Are fluid-cooled surfaces with cooling channels, as a kind of heat exchanger, provided on the path of the cooling gas between the outlet of the reflector and the fan, then cooled air passes in circulation to the respective fan, in particular a radial fan, so that this is subject to a lower heat load and the air for a re-cooling cycle is made ready.

Obwohl es im Stande der Technik auch bekannt ist, die jeweilige Lampe von der Seite her mit Luft zu kühlen, ist es im Rahmen der Erfindung günstiger, wenn das jeweilige Gebläse oberhalb der Lampe angeordnet ist, weil dann wird der aus Lampe und Reflektor bestehende Strahlkopf gerade dort am mit kühler Luft versorgt und so am wirkungsvollsten gekühlt wird, wo sie am heissesten wirdAlthough it is also known in the art to cool the respective lamp from the side with air, it is cheaper in the invention, if the respective fan is arranged above the lamp, because then the existing lamp and reflector beam head it is supplied with cool air and cooled most effectively where it gets the hottest

Weitere Einzelheiten der Erfindung ergeben sich an Hand der nachfolgenden Beschreibung eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles. Es zeigen:

Fig. 1
zeigt ein erfindungsgemäss ausgebildetes UV-Lampengehäuse im Querschnitt; und
Fig. 2
veranschaulicht ein Detail einer abgewandelten Ausführungsform in Perspektive, wobei aus Fig. 1 ersichtliche Teile, wie etwa die UV-durchlässige Platte weggelassen sind.
Further details of the invention will become apparent with reference to the following description of an embodiment schematically illustrated in the drawing. Show it:
Fig. 1
shows a trained according to the invention UV lamp housing in cross section; and
Fig. 2
illustrates a detail of an alternative embodiment in perspective, wherein Fig. 1 apparent parts, such as the UV-transmissive plate are omitted.

In Fig. 1 ist ein kastenartiges Gehäuse 1 mit Seitenwänden, einer Deck- und einer Bodenwand dargestellt. Das Gehäuse kann Führungsleisten oder andere Führungselemente 6 aufweisen, um es in ein Gestell einschieben zu können, welches beispielsweise auch eine Transporteinrichtung für Flachmaterial, wie bedrucktes Papier, umfasst.In Fig. 1 a box-like housing 1 with side walls, a cover and a bottom wall is shown. The housing may have guide rails or other guide elements 6 in order to be able to insert it into a frame which, for example, also comprises a transport device for flat material, such as printed paper.

Das Gehäuse ist vollkommen geschlossen, denn die Bodenwand trägt eine UV-durchlässige Platte 2, um das Licht einer UV-Lampe 3 mit einer Längsachse A hindurchzulassen. Dazu ist die UV-Lampe 3 in bekannter Weise von einem aus zwei Teilen bestehenden - gegebenenfalls aber auch einteiligen oder mehrteiligen - Reflektor 4 umgeben. Der Reflektor selbst kann auch als sogenannter Shutter (beweglicher Lichtverschluss) ausgebildet sein, oder es kann ein gesonderter Shutter (nicht dargestellt) vorgesehen werden.The housing is completely closed, because the bottom wall carries a UV-transparent plate 2 in order to pass the light of a UV lamp 3 with a longitudinal axis A. For this purpose, the UV lamp 3 in a known manner by a two-part - but possibly also one-piece or multi-part - reflector 4 is surrounded. The reflector itself can also be designed as a so-called shutter (movable light shutter), or a separate shutter (not shown) can be provided.

Innerhalb der Teile des Reflektors sind Kühlkanäle 5 für den Durchfluss einer Kühlflüssigkeit vorgesehen, die in an sich bekannter Weise von einem Flüssigkeitsvorrat mittels einer Pumpe (nicht dargestellt) hindurchgepumpt wird. Zweckmässig ist in diesem Kühlfluidkreislauf auch ein (nicht dargestellter Wärmetauscher vorgesehen, um die Flüssigkeit abzukühlen, anderseits aber auch die abgezogene Wärme einem nützlichen Zweck zuzuführen.Within the parts of the reflector cooling channels 5 are provided for the flow of a cooling liquid, which in a conventional manner by a liquid reservoir by means of a Pump (not shown) is pumped through. Conveniently, a (not shown heat exchanger is provided in this cooling fluid circuit to cool the liquid, on the other hand, but also supply the extracted heat a useful purpose.

Oberhalb der Lampe ist ein, beispielsweise schlitzförmiger, Kanal 7 vorgesehen, durch welchen Kühlluft auf die UV-Lampe 3 quer zu ihrer Achse A strömt. Diese Kühlluft wird von einem schematisch angedeuteten Gebläseaggregat 8 geliefert, welches gemäss Fig. 2 als schachtelartiges Modul begrenzter Grösse ausgebildet ist. Das Gebläseaggregat 8 umfasst einen (nicht dargestellten Motor samt dem Ventilator (oder einem Radiallüfter), wobei infolge der begrenzten Grösse auch der Motor von geringer Grösse mit geringem Stromverbrauch sein kann. Das wiederum bedingt, dass je nach Länge der länglichen UV-Lampe mindestens zwei, gegebenenfalls aber auch mehrere solcher Gebläseeinheiten. Damit ist wiederum gesichert, dass die UV-Lampe über ihre ganze Länge ziemlich gleichmässig und kräftig gekühlt wird, ohne dass Temperaturgradienten entlang der Lampe 3 entstehen.Above the lamp, a, for example, slot-shaped, channel 7 is provided, through which cooling air flows to the UV lamp 3 transversely to its axis A. This cooling air is supplied by a schematically indicated blower unit 8, which according to Fig. 2 is designed as a box-like module of limited size. The blower unit 8 comprises a motor (not shown) together with the fan (or a radial fan), as a result of the limited size, the motor can be of small size with low power consumption, which in turn requires at least two depending on the length of the elongated UV lamp but in some cases also several such blower units, which in turn ensures that the UV lamp is cooled quite uniformly and vigorously over its entire length without temperature gradients occurring along the lamp 3.

Die jeweiligen Gebläseaggregate 8 können jeweils für sich in das Gehäuse 1 eingeschoben werden, wie dies aus Fig. 2 hervorgeht, die eine Tragplatte 9 zeigt, welche entweder mit mehreren Modulen 8 bestückt oder etwa entlang der strichlierten Linie 10 unterteilt ist, wobei jedem Modul 8 eine gesonderte Tragplatte 9 zugeordnet ist. Die Darstellung der Fig. 1 ist ähnlich und zeigt zwei Führungsleisten 11, in welche eine das jeweilige Gebläseaggregat 8 über eine etwa V-förmige Deckplatte 9a einschiebbar ist.The respective blower units 8 can each be inserted into the housing 1, as is the case Fig. 2 emerges showing a support plate 9, which is either equipped with several modules 8 or approximately along the dashed line 10 is divided, each module 8 is assigned a separate support plate 9. The presentation of the Fig. 1 is similar and shows two guide rails 11, in which a respective blower unit 8 via an approximately V-shaped cover plate 9a is inserted.

Gerade der modulartige Aufbau der Kühlung erlaubt aber auch eine vereinfachte Lagerhaltung, weil es nun nicht mehr erforderlich ist, je nach Länge der Lampe 3 zugehörige unterschiedliche Kühlaggregate, Motoren etc. auf Lager zu haltenBut the modular design of the cooling but also allows a simplified storage, because it is no longer necessary, depending on the length of the lamp 3 associated different cooling units, motors, etc. to keep in stock

Alternativ allerdings ist das jeweilige Gebläseaggregat 8 an seiner Unterseite unmittelbar mit Luftführungseinrichtungen verbunden, in welchem Falle dann die ganze Einheit beispielsweise in Nuten 12 des Gehäuses 1 einschiebbar ist. Selbstverständlich sind auch Kombinationen denkbar, bei denen sowohl die Nuten 12 als auch die Führungsleisten 11 vorgesehen sind. In jedem Falle erreicht man so eine einfache, rasche und kostengünstige Montage.Alternatively, however, the respective blower unit 8 is connected at its bottom directly with air guide means, in which case then the whole unit, for example, in grooves 12 of the housing 1 can be inserted. Of course, combinations are also conceivable in which both the grooves 12 and the guide rails 11 are provided. In any case, one achieves such a simple, rapid and cost-effective installation.

Die erwähnten Luftführungseinrichtungen umfassen den Kanal 7, oberhalb dessen ein Umlenkkörper 13 angeordnet ist, der die vom Gebläse 8 herkommende Kühlluft in zwei gleich grosse Kanäle 14 umlenkt, gleichzeitig aber auch dafür sorgt, dass das Gebläse 8 nicht unmittelbar der Strahlungswärme der UV-Lampe 3 ausgesetzt ist. Dieser Umlenkkörper hat vorzugsweise eine dachkantenartig mit der Spitze gegen das Gebläse gerichtete Fläche, so dass sich ein geringer Strömungswiderstand ergibt und die Luft gleichmässig in die Kanäle 14 aufgeteilt wird.The above-mentioned air guide means comprise the channel 7, above which a deflecting body 13 is arranged, the coming of the fan 8 cooling air in two equally large channels deflects 14, but at the same time also ensures that the fan 8 is not directly exposed to the radiant heat of the UV lamp 3. This deflecting body preferably has a roof edge-like with the tip directed against the fan surface, so that there is a low flow resistance and the air is divided evenly into the channels 14.

Um die Wärme der UV-Lampe 3 zu absorbieren und abzuleiten, ist der Umlenkkörper 13 vorzugsweise hohl und ebenso wie die erwähnten Kühlkanäle 5 mit einem Kühlmittel versorgt, welches entweder über denselben Kühlkreislauf fliesst wie das der Kanäle 5 oder durch einen gesonderten Kühlkreislauf. Alternativ, kann der verhältnismässig grosse innerhalb eines hohlen Umlenkkörpers 13 zur Verfügung stehende Raum 17 auch dazu benutzt werden, ein verdampfbares Kühlmittel, z.B. Freon, wie es in Kühlschränken verwendet wird, einzusetzen.In order to absorb and dissipate the heat of the UV lamp 3, the deflecting body 13 is preferably hollow and, like the mentioned cooling channels 5, supplied with a coolant which flows either through the same cooling circuit as that of the channels 5 or through a separate cooling circuit. Alternatively, the relatively large space 17 available within a hollow baffle 13 may also be used to provide a vaporizable coolant, e.g. Freon, as used in refrigerators, to use.

Somit wird die Kühlluft, vom Gebläse 8 abwärts geblasen, strömt durch die Umlenkkanäle 14 und in den Kanal 7. Dieser Kanal 7 kann, wenn er nicht mit dem Gebläse 8 verbunden ist, sich über die ganze Länge der UV-Lampe 3 erstrecken, in welchem Falle seine Begrenzungswände aber jeweils an diese Länge angepasst werden müssen. Ist dagegen der Kanal 7 Bestandteil des Gebläsemoduls bzw. mit ihm fest verbunden, dann entfällt auch hier die Einzelanfertigung, weil lediglich ein Modul 7, 8, 13, 14 etc. an den anderen gereiht zu werden braucht.Thus, the cooling air, blown down from the fan 8, flows through the deflection channels 14 and into the channel 7. This channel 7, when not connected to the fan 8, can extend over the entire length of the UV lamp 3, in FIG In which case, however, its boundary walls must each be adapted to this length. If, however, the channel 7 part of the fan module or firmly connected to him, then here also eliminates the custom-made, because only one module 7, 8, 13, 14 etc. needs to be ranked at the other.

Sobald die Kühlluft den Kanal 7 verlassen hat, streicht sie über die UV-Lampe 3 und entlang der Flächen des Reflektors 4, an dessen Unterseite sie austritt. Da sich die Luft im Verlaufe dieses Weges aber erwärmt hat, hat sie die Tendenz, nach dem Austritt aus dem Reflektor 4, wo sich der Raum des Gehäuses 1 weitet, wieder aufzusteigen. Dabei strömt die Luft zwangsläufig an der Oberseite der Reflektoren 4 (wo die Kühlkanäle 5 liegen) und entlang der Seitenwände des Gehäuses 1 (die gewünschtenfalls auch noch mit einer Kühlflüssigkeit gekühlt sein können) zwischen einer Kühlrippenanordnung 15 eines Wärmetauschers, welche Kühlkanäle 5' aufweist. Die Kühlrippen können sich quer zur Zeichnungsebene oder in und parallel zur Zeichnungsebene der Fig. 1 erstrecken. Die letztere Ausführung ist bevorzugt, wobei es zweckmäßig ist, wenn diese - quer zu den Kühlkanälen 5' verlaufenden - Kühlrippen 15 gegen eine durch die Lampenachse A verlaufende Vertikalebene, d.h. also im allgemeinen gegen eine Mittelebene des Gehäuses 1 hin, offen sind. Auf diese Weise ist gesichert, dass sich die Kühlwirkung auch in Richtung gegen das Innere des Gehäuses 1 entfaltet und dort Wandungs- und/oder Reflektorteile kühlt.As soon as the cooling air has left the channel 7, it passes over the UV lamp 3 and along the surfaces of the reflector 4, at the bottom of which it exits. However, since the air has warmed in the course of this path, it has the tendency to ascend again after exiting the reflector 4, where the space of the housing 1 widens. In this case, the air inevitably flows at the top of the reflectors 4 (where the cooling channels 5 are) and along the side walls of the housing 1 (which may also be cooled with a cooling liquid if desired) between a cooling fin arrangement 15 of a heat exchanger having cooling channels 5 '. The cooling fins may be transverse to the plane of the drawing or in and parallel to the plane of the drawing Fig. 1 extend. The latter embodiment is preferred, wherein it is expedient if these - transverse to the cooling channels 5 '- extending cooling fins 15 against a running through the lamp axis A vertical plane, ie in general against a median plane of the housing 1, are open. In this way, it is ensured that the cooling effect also unfolds in the direction towards the interior of the housing 1, where it cools wall and / or reflector parts.

Sodann gelangt sie erst wieder zum Gebläseaggregat 8, wo sie über eine obere Öffnung 16 (Fig. 2) eintritt und erneut gekühlt durch die Umlenkkanäle geblasen wird. Es ist klar, dass durch diese Umlaufkühlung im geschlossenen Kreislauf vermieden wird, warme Abluft wegblasen zu müssen (die in der Kühlflüssigkeit absorbierte Wärme kann über Wärmetauscher nutzbar gemacht werden), wobei es natürlich nötig ist, das Gehäuse 1 mittels der UV-durchlässigen Platte 2 abzuschliessen. Insofern ist also diese Kühlung in einem in sich geschlossenen System von besonderer Bedeutung.Then it only returns to the blower unit 8, where it has an upper opening 16 (FIG. Fig. 2 ) enters and again cooled by the deflection channels is blown. It is clear that this circulating cooling in the closed circuit avoids having to blow away warm exhaust air (the heat absorbed in the cooling liquid can be utilized by way of heat exchangers), whereby it is naturally necessary to use housing 1 by means of the UV-permeable plate 2 insurance. In this respect, therefore, this cooling in a self-contained system is of particular importance.

Claims (5)

  1. Device for radiating a substrate by means of UV rays, comprising an elongated UV lamp (3) comprising reflector (4) along a longitudinal axis (A), which is arranged in a housing (1) such that UV rays escape directly or indirectly from the housing (1) at an exit point, as well as comprising a first cooling arrangement (7, 8, 13, 14) for cooling the UV lamp (3) by means of a cooling gas flow, and a second cooling arrangement (5, 5', 17) for cooling the cooling gas flow by means of a fluid, wherein the exit side is closed by means of a UV-permeable plate (2),
    characterised in that
    for cooling the UV lamp (3), at least two units, which blow at right angles to the longitudinal axis (A), each comprising a fan (8), are arranged above the UV lamp (3) in modular setup with a number, which can be adapted to different lengths of the UV lamp (3), and can be exchanged as separate units, wherein the fans are equipped such that the cooling gas is guided onto the UV lamp (3) from the top, is guided past the walls of the reflector (4), which has at least one cooling fluid channel (5), and is finally fed to the fan (8) again during the operation of the fans by means of the airflow thereof, wherein the second cooling arrangement (5, 5', 17) has cooling surfaces (15) comprising cooling channels (5') along the path of the cooling gas from the lower exit of the reflector (4) to the upper openings of the at least two fans (8) and thus discharges the heat to the outside.
  2. Device according to claim 1,
    characterised in that
    the units, which each comprise a fan (8), can each be inserted into the lamp housing (1) on a rail (11), in a groove (12) or a similar longitudinal guide.
  3. Device according to claim 1 or 2,
    characterised in that
    the air guide from the fan (8) to the UV lamp (3) has a deflection (13) comprising a surface, which is cooled by means of at least one cooling channel, wherein the surface of the deflection (13) is preferably directed with the tip against the fan (8) in a roof-edge like manner.
  4. Device according to any one of the preceding claims,
    characterised in that
    the housing (1) itself, which accommodates the fan units (8), is provided with a longitudinal sliding guide (6).
  5. Device according to any one of the preceding claims,
    characterised in that
    cooling ribs (15), which are open towards a vertical plane that runs through the lamp axis (A), are provided along the way of the cooling gas between the exit of the reflector (4) and the fan (8).
EP09171971.6A 2008-12-01 2009-10-01 Device for radiating a substrate Active EP2192366B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01880/08A CH700039A1 (en) 2008-12-01 2008-12-01 Device for irradiating a substrate

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Publication Number Publication Date
EP2192366A2 EP2192366A2 (en) 2010-06-02
EP2192366A3 EP2192366A3 (en) 2014-01-01
EP2192366B1 true EP2192366B1 (en) 2016-07-27

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2468703A (en) * 2009-03-19 2010-09-22 Gew Ink curing apparatus with water cooled heat exchanging means
DE202017006537U1 (en) * 2017-12-21 2018-01-19 Gunther Ackermann Device for irradiating an object

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604500A (en) * 1970-04-07 1971-09-14 Integrated Dev And Mfg Co Method of controlling fluorescent lamp output
JPS5132969U (en) * 1974-09-03 1976-03-11
US4419716A (en) * 1983-01-03 1983-12-06 Stephen Koo Vapor proof housing assembly and system
US5094010A (en) 1990-07-05 1992-03-10 Amjo Infra-Red And Ultra-Violet Drying Systems, Inc. Vented ultraviolet drying system for drying fiberglass resins in boat hulls and decks
US5323271A (en) * 1992-11-24 1994-06-21 Equestrian Co., Ltd. Water- and air-cooled reflection mirror
DK0879146T3 (en) 1995-03-15 2001-06-18 Nlm Combineering Aps Method for activating photoinitiators in photosensitive substrates and apparatus for curing such substrates
DE59603722D1 (en) 1995-05-04 1999-12-30 Noelle Gmbh DEVICE FOR HARDENING A LAYER ON A SUBSTRATE
DE59805621D1 (en) 1997-05-26 2003-11-20 Bernhard Max Glaus DEVICE FOR IRRADIATING A SUBSTRATE BY means of UV RADIATION AND METHOD FOR OPERATING THE DEVICE
US5861633A (en) * 1997-08-04 1999-01-19 Con-Trol-Cure, Inc. Irradiator apparatus
DE19916474A1 (en) 1999-04-13 2000-10-26 Ist Metz Gmbh Radiation device
FR2798187B1 (en) * 1999-09-06 2002-02-01 Christian Lumpp ELECTROMAGNETIC IRRADIATION DEVICE HAVING COOLING MEANS
JP3846232B2 (en) * 2000-12-08 2006-11-15 ウシオ電機株式会社 Circulating air cooling system for light irradiators
AU2003273789A1 (en) * 2002-10-29 2004-05-25 Knud Andreasen Cooling of devices for uv hardening
US7077547B2 (en) * 2004-07-29 2006-07-18 Nordson Corporation Shuttered lamp assembly and method of cooling the lamp assembly
JP4424296B2 (en) * 2005-10-13 2010-03-03 ウシオ電機株式会社 UV irradiation equipment
GB2444328B (en) * 2006-12-01 2010-06-09 Gew Cooling system for ink curing apparatus

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CH700039A1 (en) 2010-06-15
EP2192366A3 (en) 2014-01-01

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