EP1533116A1 - Device for controlling the temperature of a printing press - Google Patents

Device for controlling the temperature of a printing press Download PDF

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Publication number
EP1533116A1
EP1533116A1 EP04027325A EP04027325A EP1533116A1 EP 1533116 A1 EP1533116 A1 EP 1533116A1 EP 04027325 A EP04027325 A EP 04027325A EP 04027325 A EP04027325 A EP 04027325A EP 1533116 A1 EP1533116 A1 EP 1533116A1
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EP
European Patent Office
Prior art keywords
heat exchanger
circuit
cooling
water
process water
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Granted
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EP04027325A
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German (de)
French (fr)
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EP1533116B1 (en
Inventor
Thomas Haas
Nicholas Cruz
Steve Barberi
Lou J. Barberi
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Technotrans SE
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Technotrans SE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/22—Means for cooling or heating forme or impression cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening

Definitions

  • the invention relates to a tempering device for printing machines, with a Compression refrigeration system with a condenser and an evaporator, in the a refrigerant circulates, a free cooling circuit, in which a coolant, in particular Water circulates, a process water circuit in which a coolant for pressure rollers or a dampening solution for the offset pressure circulates, and heat exchange means for cooling the process water circuit using the compression refrigeration system and / or the Freikühlernikes.
  • Temperature control systems for printing presses are in various embodiments known. These are usually cooling systems, since during operation of a Printing machine inevitably some warming occurs, which is the Can affect print quality.
  • the cooling can be done by water cooling the friction rollers using a continuous line system or - in offset printing - by a cooled dampening solution applied to the rollers is applied. Occasionally, even cooled air is applied to certain parts or Inflated assemblies of printing machines.
  • Indirectly cooled systems are usually water cooled.
  • the process water is in an integrated water / water heat exchanger cooled by the cooling water of an external source.
  • Process water also by mixing with the cooling water of the external source cooled. Since a separation of the circuits is inevitably not possible, is suitable This procedure is not for the cooling of dampening solution.
  • Directly cooled systems with a water-cooled condenser in the refrigeration circuit usually obtain their cooling water from central cooling water systems. This are often systems with free coolers or evaporative coolers.
  • the temperature level the cooling water of these external cooling systems is always low enough to ensure adequate cooling of the water-cooled condenser To ensure refrigeration system. Also, the temperature level is in most Cases sufficient to other peripherals on printing machines like Air supply cabinets or drying cabinets sufficient with cooling too supply. But the temperature level of this cooling water is not always low is enough to direct this by means of a water / water heat exchanger Cooling of the process water for cooling the distributor rollers in the printing machine to use, appropriate systems are currently not used.
  • the conventional systems have the particular disadvantage that they have a require high energy input and have correspondingly high operating costs.
  • the invention is therefore based on the object, a cooling device for To create printing machines that manage with significantly lower energy consumption and an effective temperature control of different tempering media permit, without causing a mixing of the cooling water and the Temperierwasserströme comes.
  • a temperature control device of the above is characterized in that that a three-media heat exchanger is provided, in which the Process water circuit with both the compression circuit and with the heat exchanger is brought into heat exchange the free cooler cycle.
  • a three-media heat exchanger is understood to mean a heat exchanger be in separate chambers of the compression refrigeration cycle and the free cooling circuit is flowed through, while the process water or Temperiermedienniklauf both chambers in a separate line system passes.
  • the two chambers of the three-media heat exchanger a spatial unit, so for example a common housing with Form partition or constitute separate units.
  • the circle called the free-cooling circuit may be a water cooler have, which is traversed by a fan of outside air. It But it can also be another source of relatively cool water act.
  • the free cooling circuit can parallel to the three-media heat exchanger the Go through the condenser heat exchanger of the compression refrigeration system and for condensing the circulating in the compression refrigeration cycle refrigerant be used.
  • the flowed through by the compression refrigeration cycle chamber of the three-media heat exchanger preferably forms the evaporator of the compression refrigeration cycle.
  • the process water first passes through that of the two chambers of the three-media heat exchanger, that of the cooling water of the free cooling circuit is flowed through, so that the mentioned effect of pre-cooling used if the temperature conditions are suitable.
  • a particular advantage of the solution according to the invention is that the process water not only with the compression refrigeration cycle, but also with the free cooling cycle through heat exchangers in heat exchange stands that So not about the free cooler cycle directly as a process water cycle is used.
  • the process water cycle be formed by a dampening solution for the offset pressure, while the free cooling circuit Water, for example, contains water with antifreeze.
  • Each circuit may have piping systems made of materials suitable for the transported medium are particularly suitable, for example rustproof Steel in the case of corrosive media.
  • the single figure shows a possible embodiment of the invention.
  • a three-media heat exchanger is designated 10.
  • This Three-media heat exchanger 10 has a first chamber 12 and a second one Chamber 14, which in the illustrated embodiment to a spatial Unit summarized within a common housing and only are separated by a partition wall 16.
  • the two chambers can also form separate units.
  • In the first chamber 12 enters an inlet line 18 of a process water circuit, and from the chamber 12 occurs on the other an outlet line 20 of this process water circuit.
  • the two lines 18,20 are connected inside the two chambers with raw coils 22, in which the process water flows through the two chambers 12,14.
  • the inlet conduit 18 and the outlet conduit 20 are outside the three-media heat exchanger connected to a printing machine, not shown.
  • a water-air cooler 28 with a blower 30 With the first, left in the drawing lying chamber 12 of the three-media heat exchanger 10 are inlet 24 and outlet 26 of a free cooling circuit connected as a cooling source, a water-air cooler 28 with a blower 30 has.
  • the water-air cooler 28 is traversed by a coil 32, mounted on the tubes spaced, parallel metal plates 34 are increased by the heat transfer surfaces of the tubes.
  • the pipe coil goes outside the water-air cooler 28 in a flow line 36 of a free cooling circuit, the return line 38 on the other enters the water-air cooler 28 and connected to the coil 32 is.
  • the flow line 36 further includes a three-way valve 40, in the at the same time a coming from the return line 38 bypass line 42 occurs.
  • a three-way valve 40 which has a servomotor 44 and not in manner shown using an electronic control function of the Flow temperature of the cooling water can be controlled, part of the Cooling water fed directly from the return line 38 into the flow line when, for example, the cooled in the water-air cooler 28 Cooling water is too cold for the need.
  • a pump 46 Downstream of the three-way valve 40 is a pump 46, and subsequently to this a three-way valve 48 with actuator 50th
  • the three-way valve 48 is controllable, depending on the desired mode the cooling water is directed to one side or the other or distributed proportionately becomes. If the temperature in the free cooling circuit is sufficiently low, the Process water circuit in the left chamber 12 of the three-media heat exchanger 10 are cooled alone.
  • This compression refrigeration cycle 54 includes a compressor 56 already mentioned condenser heat exchanger 50, an expansion valve 58 and a Evaporator, which is formed by the second chamber 14 of the three-media heat exchanger.
  • the four elements mentioned are in a closed circle connected together, as is common in refrigerators.
  • a temperature sensor 62 determines the temperature in the line between the evaporator 14th and the compressor 56 and outputs signals indicative of the control of the expansion valve 58 are used.
  • the mode of action of the temperature control device according to the invention is intended subsequently to be discribed.
  • a water-air cooler of the illustrated Type it will depend primarily on the outside temperature, whether the Cooling of the press alone with the help of the cooling water of the free cooling circuit can be achieved or the Kompressionskarlte Vietnamese be switched on got to. If the outside temperature is sufficiently low, then only the cooling water circuit be used for the cooling by the three-way valve 48 to left side is opened and the cooling water in a closed circle the left chamber 12 of the three-media heat exchanger 10 flows through. Is the temperature while too low, so can already heated over the three-way valve 40 Cooling water from the return line 38 are mixed in the flow line.
  • the free cooler circuit may be the free cooler circuit for pre-cooling of the process water.
  • the process water first passes through the left chamber 12 in the drawing, in which a heat exchange with the cooling water of the free cooling circuit takes place, and then the chamber 14, passing through the evaporator the compression refrigeration cycle is formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Abstract

The temperature control device includes a compression cold plant with a condenser (50) and evaporator (14) in which a coolant circulates; a free cooler circuit in which a water circulates; and a process water circuit in which a coolant for the printing rolls or moistener for offset printing circulates. The process water circuit is cooled by heat exchange. A three-media heat exchanger (10) is used for the exchange of heat between the circuits.

Description

Die Erfindung betrifft eine Temperiervorrichtung für Druckmaschinen, mit einer Kompressionskälteanlage mit einem Kondensator und einem Verdampfer, in der ein Kältemittel zirkuliert, einem Freikühlerkreis, in dem ein Kühlmittel, insbesondere Wasser zirkuliert, einem Prozeßwasserkreislauf, in dem ein Kühlmittel für Druckwalzen oder ein Feuchtmittel für den Offset-Druck zirkuliert, und Wärmetauschermitteln zur Kühlung des Prozeßwasserkreislaufs mithilfe der Kompressionskälteanlage und/oder des Freikühlerkreises.The invention relates to a tempering device for printing machines, with a Compression refrigeration system with a condenser and an evaporator, in the a refrigerant circulates, a free cooling circuit, in which a coolant, in particular Water circulates, a process water circuit in which a coolant for pressure rollers or a dampening solution for the offset pressure circulates, and heat exchange means for cooling the process water circuit using the compression refrigeration system and / or the Freikühlerkreises.

Temperiersysteme für Druckmaschinen sind in verschiedenen Ausführungsformen bekannt. In der Regel handelt es sich um Kühlsysteme, da beim Betrieb einer Druckmaschine zwangsläufig eine gewisse Erwärmung auftritt, die die Druckqualität beeinträchtigen kann. Die Kühlung kann erfolgen durch Wasserkühlung der Reiberrollen mithilfe eines diese durchlaufenden Leitungssystems oder - beim Offset-Druck - durch ein gekühltes Feuchtmittel, das auf die Walzen aufgebracht wird. Gelegentlich wird auch gekühlte Luft auf bestimmte Teile oder Baugruppen der Druckmaschinen aufgeblasen.Temperature control systems for printing presses are in various embodiments known. These are usually cooling systems, since during operation of a Printing machine inevitably some warming occurs, which is the Can affect print quality. The cooling can be done by water cooling the friction rollers using a continuous line system or - in offset printing - by a cooled dampening solution applied to the rollers is applied. Occasionally, even cooled air is applied to certain parts or Inflated assemblies of printing machines.

Für diese Systeme werden Kälteanlagen benötigt, die einen relativ hohen Energieverbrauch haben. Bekannt sind Systeme, die entweder direkt oder indirekt durch Kälteanlagen, das heißt Kompressionskälteanlagen gekühlt werden. Direkt gekühlte Systeme funktionieren in den meisten Fällen durch die direkte Kühlung des Prozeßmediums, in den meisten Fällen Wasser oder eine Mischung aus Wasser und Glykol, durch verdampfendes Kältemittel in dem als Wärmetauscher ausgebildeten Verdampfer einer Kompressionskälteanlage. Die direkt gekühlten Systeme haben entweder einen integrierten luft- oder wassergekühlten Kondensator oder einen externen luftgekühlten Kondensator.For these systems refrigeration systems are required, which have a relatively high Have energy consumption. Systems are known, either directly or indirectly by refrigeration systems, that is cooled compression refrigeration systems. Direct-cooled systems work in most cases by direct Cooling of the process medium, in most cases water or a mixture from water and glycol, by evaporating refrigerant in the as a heat exchanger trained evaporator of a compression refrigeration system. The directly cooled Systems have either an integrated air or water cooled Capacitor or an external air-cooled condenser.

Indirekt gekühlte Systeme sind gewöhnlich wassergekühlt. In diesen Systemen wird das Prozeßwasser in einem integrierten Wasser/Wasser-Wärmetauscher durch das Kühlwasser einer externen Quelle gekühlt. In einigen Fällen wird das Prozeßwasser auch durch Mischung mit dem Kühlwasser der externen Quelle gekühlt. Da eine Trennung der Kreisläufe zwangsläufig nicht möglich ist, eignet sich diese Verfahrensweise nicht für die Kühlung von Feuchtmittel. Indirectly cooled systems are usually water cooled. In these systems the process water is in an integrated water / water heat exchanger cooled by the cooling water of an external source. In some cases that will Process water also by mixing with the cooling water of the external source cooled. Since a separation of the circuits is inevitably not possible, is suitable This procedure is not for the cooling of dampening solution.

Direkt gekühlte Systeme mit einem wassergekühlten Kondensator im Kältekreis beziehen ihr Kühlwasser üblicherweise von zentralen Kühlwassersystemen. Dies sind häufig Systeme mit Freikühlern oder Verdampfungskühlern. Das Temperaturniveau des Kühlwassers dieser externen Kühlsysteme ist immer niedrig genug, um eine ausreichende Kühlung des wassergekühlten Kondensators der Kälteanlage zu gewährleisten. Ebenfalls ist das Temperaturniveau in den meisten Fällen ausreichend, um andere Peripheriegeräte an Druckmaschinen wie Luftversorgungsschränke oder Trockenschränke ausreichend mit Kühlung zu versorgen. Da das Temperaturniveau dieses Kühlwasser aber nicht immer niedrig genug ist, um dieses mittels eines Wasser/Wasser-Wärmetauscher zur direkten Kühlung des Prozeßwassers zur Kühlung der Reiberwalzen in der Druckmaschine zu verwenden, werden entsprechende Systeme derzeitig nicht eingesetzt.Directly cooled systems with a water-cooled condenser in the refrigeration circuit usually obtain their cooling water from central cooling water systems. This are often systems with free coolers or evaporative coolers. The temperature level the cooling water of these external cooling systems is always low enough to ensure adequate cooling of the water-cooled condenser To ensure refrigeration system. Also, the temperature level is in most Cases sufficient to other peripherals on printing machines like Air supply cabinets or drying cabinets sufficient with cooling too supply. But the temperature level of this cooling water is not always low is enough to direct this by means of a water / water heat exchanger Cooling of the process water for cooling the distributor rollers in the printing machine to use, appropriate systems are currently not used.

Die herkömmlichen Systeme haben insbesondere den Nachteil, dass sie einen hohen Energieeinsatz erfordern und entsprechend hohe Betriebskosten aufweisen.The conventional systems have the particular disadvantage that they have a require high energy input and have correspondingly high operating costs.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Kühlvorrichtung für Druckmaschinen zu schaffen, die mit erheblich geringerem Energieeinsatz auskommen und eine wirksame Temperierung unterschiedlicher Temperiermedien ermöglichen, ohne dass es zu einer Vermischung der Kühlwasser- und der Temperierwasserströme kommt.The invention is therefore based on the object, a cooling device for To create printing machines that manage with significantly lower energy consumption and an effective temperature control of different tempering media permit, without causing a mixing of the cooling water and the Temperierwasserströme comes.

Zur Lösung dieser Aufgabe ist eine Temperiervorrichtung der obigen dadurch gekennzeichnet, dass ein Dreimedien-Wärmetauscher vorgesehen ist, in dem der Prozeßwasserkreislauf sowohl mit dem Kompressionskältekreis als auch mit dem Freikühlerkreislauf in Wärmeaustausch gebracht wird.To achieve this object, a temperature control device of the above is characterized in that that a three-media heat exchanger is provided, in which the Process water circuit with both the compression circuit and with the heat exchanger is brought into heat exchange the free cooler cycle.

Unter einem Dreimedien-Wärmetauscher soll ein Wärmetauscher verstanden werden, der in getrennten Kammern von dem Kompressionskältekreislauf und dem Freikühlerkreislauf durchströmt wird, während der Prozeßwasser- oder Temperiermedienkreislauf beide Kammern in einem getrennten Leitungssystem durchläuft. A three-media heat exchanger is understood to mean a heat exchanger be in separate chambers of the compression refrigeration cycle and the free cooling circuit is flowed through, while the process water or Temperiermedienkreislauf both chambers in a separate line system passes.

Es kommt dabei nicht darauf an, ob die beiden Kammern des Dreimedien-Wärmetauschers eine räumliche Einheit, also etwa ein gemeinsames Gehäuse mit Trennwand bilden oder gesonderte Einheiten darstellen.It does not matter whether the two chambers of the three-media heat exchanger a spatial unit, so for example a common housing with Form partition or constitute separate units.

Mit einem Dreimedien-Wärmetauscher der genannten Art ist es möglich, bei ausreichend niedrigen Außentemperaturen die Kühlung allein mithilfe des Freikühlerkreislaufs vorzunehmen, während bei hohen Außentemperaturen zusätzlich oder allein der Kompressionskältekreislauf zur Kühlung des Prozeßwassers eingesetzt wird.With a three-media heat exchanger of the type mentioned, it is possible at sufficiently low outside temperatures, the cooling alone using the free cooling circuit while at high outside temperatures in addition or only the compression refrigeration cycle for cooling the process water is used.

Der als Freikühlerkreis bezeichnete Kreis kann beispielsweise einen Wasserkühler aufweisen, der mithilfe eines Gebläses von Außenluft durchströmt wird. Es kann sich aber auch um eine andere, relativ kühles Wasser abgebende Quelle handeln.For example, the circle called the free-cooling circuit may be a water cooler have, which is traversed by a fan of outside air. It But it can also be another source of relatively cool water act.

Der Freikühlerkreislauf kann parallel zu dem Dreimedien-Wärmetauscher den Kondensator-Wärmetauscher der Kompressionskälteanlage durchlaufen und zum Kondensieren des im Kompressionskältekreislauf umlaufenden Kältemittels eingesetzt werden.The free cooling circuit can parallel to the three-media heat exchanger the Go through the condenser heat exchanger of the compression refrigeration system and for condensing the circulating in the compression refrigeration cycle refrigerant be used.

Die von dem Kompressionskältekreislauf durchströmte Kammer des Dreimedien-Wärmetauschers bildet vorzugsweise den Verdampfer des Kompressionskältekreislaufs.The flowed through by the compression refrigeration cycle chamber of the three-media heat exchanger preferably forms the evaporator of the compression refrigeration cycle.

Eine Temperiervorrichtung der beschriebenen Art benötigt beispielsweise solange keine zusätzliche Kühlung durch die Kompressionskälteanlage, wie die Umgebungstemperatur der Luft,die zur Kühlung des Kühlwassers verwendet wird, oder auch die Temperatur einer anderen Kühlwasserquelle einen Wert ausreichend unterhalb der Prozeßwassertemperatur aufweist. Ist die Kühlwassertemperatur zu hoch für die reine direkte Kühlung des Prozeßwassers, so wird der Kühlwasserstrom aufgeteilt. Er kann in diesem Fall entweder das Prozeßwasser in einem gewissen Maße vorkühlen, solange die Kühlwasservorlauftemperatur unter der Prozeßwassertemperatur liegt, oder den wassergekühlten Kondensator-Verdampfer der Kompressionskälteanlage kühlen, die jetzt zugeschaltet werden muß. A tempering of the type described, for example, as long as needed no additional cooling by the compression refrigeration system, such as the ambient temperature the air used to cool the cooling water or the temperature of another cooling water source a value sufficient having below the process water temperature. Is the cooling water temperature too high for the pure direct cooling of the process water, so is the Divided cooling water flow. He can in this case either the process water pre-cool to a certain extent as long as the cooling water supply temperature is below the process water temperature, or the water-cooled condenser-evaporator cool the compression refrigeration system, which are now switched on got to.

Ist die Kühlwassertemperatur des Freikühlerkreises selbst zum Vorkühlen des Prozeßwassers zu hoch, so kann der Freikühlerkreis nur noch allein für die Kühlung des Kondensator-Verdampfers der Kompressionskälteanlage eingesetzt werden.Is the cooling water temperature of the free cooling circuit itself for precooling the Process water too high, so the free cooler cycle can only for the Cooling of the condenser-evaporator of the compression refrigeration system used become.

Vorzugsweise durchläuft das Prozeßwasser zunächst diejenige der beiden Kammern des Dreimedien-Wärmetauschers, die von dem Kühlwasser des Freikühlerkreises durchströmt wird, damit der erwähnte Effekt der Vorkühlung genutzt werden kann, sofern die Temperaturbedingungen geeignet sind.Preferably, the process water first passes through that of the two chambers of the three-media heat exchanger, that of the cooling water of the free cooling circuit is flowed through, so that the mentioned effect of pre-cooling used if the temperature conditions are suitable.

Ein besonderer Vorteil der erfindungsgemäßen Lösung liegt darin, daß das Prozeßwasser nicht nur mit dem Kompressionskältekreislauf, sondern auch mit dem Freikühlerkreislauf über Wärmetauscher in Wärmeaustausch steht, dass also nicht etwa der Freikühlerkreislauf unmittelbar als Prozeßwasserkreislauf benutzt wird. Auf diese Weise können in den einzelnen Kreisläufen unterschiedliche Medien zirkulieren. So kann beispielsweise der Prozeßwasserkreislauf durch ein Feuchtmittel für den Offset-Druck gebildet werden, während der Freikühlerkreislauf Wasser, beispielsweise auch Wasser mit Frostschutzmittel enthält. Jeder Kreislauf kann Leitungssysteme aus Materialien aufweisen, die für das transportierte Medium besonders geeignet sind, beispielsweise nicht rostender Stahl im Fall von korrosiven Medien.A particular advantage of the solution according to the invention is that the process water not only with the compression refrigeration cycle, but also with the free cooling cycle through heat exchangers in heat exchange stands that So not about the free cooler cycle directly as a process water cycle is used. In this way, in the individual circuits different Media circulate. For example, the process water cycle be formed by a dampening solution for the offset pressure, while the free cooling circuit Water, for example, contains water with antifreeze. Each circuit may have piping systems made of materials suitable for the transported medium are particularly suitable, for example rustproof Steel in the case of corrosive media.

Im folgenden werden bevorzugte Ausführungsbeispiele der Erfindung anhand der beigefügten Zeichnung näher erläutert.In the following preferred embodiments of the invention are based on the accompanying drawings explained.

Die einzige Figur zeigt ein mögliches Ausführungsbeispiel der Erfindung.The single figure shows a possible embodiment of the invention.

In der Zeichnung ist ein Dreimedien-Wärmetauscher mit 10 bezeichnet. Dieser Dreimedien-Wärmetauscher 10 weist eine erste Kammer 12 und eine zweite Kammer 14 auf, die bei der dargestellten Ausführungsform zu einer räumlichen Einheit innerhalb eines gemeinsamen Gehäuses zusammengefaßt und lediglich durch eine Trennwand 16 getrennt sind. Die beiden Kammern können jedoch auch getrennte Einheiten bilden. In die erste Kammer 12 tritt eine Eintrittsleitung 18 eines Prozeßwasserkreises ein, und aus der Kammer 12 tritt andererseits eine Austrittsleitung 20 dieses Prozeßwasserkreises aus. Die beiden Leitungen 18,20 sind im Inneren der beiden Kammern mit Rohschlangen 22 verbunden, in denen das Prozeßwasser die beiden Kammern 12,14 durchströmt. In the drawing, a three-media heat exchanger is designated 10. This Three-media heat exchanger 10 has a first chamber 12 and a second one Chamber 14, which in the illustrated embodiment to a spatial Unit summarized within a common housing and only are separated by a partition wall 16. The two chambers, however, can also form separate units. In the first chamber 12 enters an inlet line 18 of a process water circuit, and from the chamber 12 occurs on the other an outlet line 20 of this process water circuit. The two lines 18,20 are connected inside the two chambers with raw coils 22, in which the process water flows through the two chambers 12,14.

Die Eintrittsleitung 18 und die Austrittsleitung 20 sind außerhalb des Dreimedien-Wärmetauschers mit einer nicht dargestellten Druckmaschine verbunden.The inlet conduit 18 and the outlet conduit 20 are outside the three-media heat exchanger connected to a printing machine, not shown.

Mit der ersten, links in der Zeichnung liegenden Kammer 12 des Dreimedien-Wärmetauschers 10 sind Einlaß 24 und Auslaß 26 eines Freikühlerkreislaufs verbunden, der als Kühlquelle einen Wasser-Luft-Kühler 28 mit einem Gebläse 30 aufweist. Der Wasser-Luft-Kühler 28 wird von einer Rohrschlange 32 durchlaufen, auf deren Rohren in Abstand liegende, parallele Blechplatten 34 befestigt sind, durch die Wärmeübertragungsflächen der Rohre vergrößert werden.With the first, left in the drawing lying chamber 12 of the three-media heat exchanger 10 are inlet 24 and outlet 26 of a free cooling circuit connected as a cooling source, a water-air cooler 28 with a blower 30 has. The water-air cooler 28 is traversed by a coil 32, mounted on the tubes spaced, parallel metal plates 34 are increased by the heat transfer surfaces of the tubes.

Die Rohrschlange geht außerhalb des Wasser-Luft-Kühlers 28 über in eine Vorlaufleitung 36 eines Freikühlerkreises, dessen Rücklaufleitung 38 andererseits in den Wasser-Luft-Kühler 28 eintritt und mit der Rohrschlange 32 verbunden ist.The pipe coil goes outside the water-air cooler 28 in a flow line 36 of a free cooling circuit, the return line 38 on the other enters the water-air cooler 28 and connected to the coil 32 is.

Die Vorlaufleitung 36 enthält im weiteren Verlauf ein Dreiwegeventil 40, in das zugleich eine von der Rücklaufleitung 38 kommende Bypassleitung 42 eintritt. Mithilfe des Dreiwegeventils 40, das einen Stellmotor 44 aufweist und in nicht gezeigter Weise mithilfe einer elektronischen Steuerung in Abhängigkeit von der Vorlauftemperatur des Kühlwassers gesteuert werden kann, kann ein Teil des Kühlwassers unmittelbar von der Rücklaufleitung 38 in die Vorlaufleitung eingespeist werden, wenn beispielsweise das im Wasser-Luft-Kühler 28 gekühlte Kühlwasser für den Bedarf zu kalt ist.The flow line 36 further includes a three-way valve 40, in the at the same time a coming from the return line 38 bypass line 42 occurs. Using the three-way valve 40, which has a servomotor 44 and not in manner shown using an electronic control function of the Flow temperature of the cooling water can be controlled, part of the Cooling water fed directly from the return line 38 into the flow line when, for example, the cooled in the water-air cooler 28 Cooling water is too cold for the need.

Stromabwärts des Dreiwegeventils 40 befindet sich eine Pumpe 46, und anschließend an diese ein Dreiwegeventil 48 mit Stellmotor 50.Downstream of the three-way valve 40 is a pump 46, and subsequently to this a three-way valve 48 with actuator 50th

Von diesem Dreiwegeventil 48 aus kann das Kühlwasser je nach Ventilstellung einerseits nach links in der Zeichnung zu dem Einlaß 24 der linken Kammer 12 des Dreimedien-Wärmetauschers 10 geleitet werden. Andererseits kann das Kühlwasser auch nach rechts zu einem Kondensator-Wärmetauscher einer Kompressionskälteanlage fließen, auf die später eingegangen werden soll. Der Auslaß 26 der linken Kammer 12 des Dreimedien-Wärmetauschers 10 und ein nicht bezeichneter Auslaß des Kondensator-Wärmetauschers 50 sind zu der Rücklaufleitung 38 in einem Punkt 52 zusammengefaßt. From this three-way valve 48, the cooling water depending on the valve position on the one hand to the left in the drawing to the inlet 24 of the left chamber 12th the three-media heat exchanger 10 are passed. On the other hand, that can Cooling water also to the right to a condenser heat exchanger one Compression refrigeration system flow, which will be discussed later. Of the Outlet 26 of the left chamber 12 of the three-media heat exchanger 10 and a unspecified outlet of the condenser heat exchanger 50 are to Return line 38 summarized in a point 52.

Das Dreiwegeventil 48 ist so steuerbar, dass je nach gewünschter Betriebsart das Kühlwasser ganz zur einen oder anderen Seite geleitet oder anteilig verteilt wird. Wenn die Temperatur im Freikühlerkreis ausreichend niedrig ist, kann der Prozeßwasserkreis in der linken Kammer 12 des Dreimedien-Wärmetauschers 10 allein gekühlt werden.The three-way valve 48 is controllable, depending on the desired mode the cooling water is directed to one side or the other or distributed proportionately becomes. If the temperature in the free cooling circuit is sufficiently low, the Process water circuit in the left chamber 12 of the three-media heat exchanger 10 are cooled alone.

Dies wird jedoch bei hohen Außentemperaturen und damit zu hohen Kühlwassertemperaturen nicht möglich sein. Daher muß in diesen Fällen ein Kompressionskältekreis 54 zugeschaltet werden.However, this is at high outside temperatures and thus high cooling water temperatures not possible. Therefore, in these cases, a compression refrigeration cycle 54 are switched on.

Dieser Kompressionskältekreislauf 54 umfaßt einen Kompressor 56, den bereits erwähnten Kondensator-Wärmetauscher 50, ein Expansionsventil 58 und einen Verdampfer, der gebildet wird durch die zweite Kammer 14 des Dreimedien-Wärmetauschers. Die genannten vier Elemente sind in einem geschlossenen Kreis miteinander verbunden, wie es bei Kältemaschinen üblich ist. Ein Temperatursensor 62 ermittelt die Temperatur in der Leitung zwischen dem Verdampfer 14 und dem Kompressor 56 und gibt Signale ab, die für die Steuerung des Expansionsventil 58 verwendet werden.This compression refrigeration cycle 54 includes a compressor 56 already mentioned condenser heat exchanger 50, an expansion valve 58 and a Evaporator, which is formed by the second chamber 14 of the three-media heat exchanger. The four elements mentioned are in a closed circle connected together, as is common in refrigerators. A temperature sensor 62 determines the temperature in the line between the evaporator 14th and the compressor 56 and outputs signals indicative of the control of the expansion valve 58 are used.

Die Wirkungsweise der erfindungsgemäßen Temperiervorrichtung soll anschliessend beschrieben werden. Bei Verwendung eines Wasser-Luft-Kühlers der dargestellten Art wird es in erster Linie auf die Außentemperatur ankommen, ob die Kühlung der Druckmaschine allein mithilfe des Kühlwassers des Freikühlerkreises erreicht werden kann oder der Kompressionskältekreis zugeschaltet werden muß. Ist die Außentemperatur ausreichend niedrig, so muß lediglich der Kühlwasserkreis für die Kühlung genutzt werden, indem das Dreiwegeventil 48 zur linken Seite geöffnet wird und das Kühlwasser in einem geschlossenen Kreis die linke Kammer 12 des Dreimedien-Wärmetauschers 10 durchströmt. Ist die Temperatur dabei zu niedrig, so kann über das Dreiwegeventil 40 bereits erwärmtes Kühlwasser aus der Rücklaufleitung 38 in die Vorlaufleitung eingemischt werden.The mode of action of the temperature control device according to the invention is intended subsequently to be discribed. When using a water-air cooler of the illustrated Type it will depend primarily on the outside temperature, whether the Cooling of the press alone with the help of the cooling water of the free cooling circuit can be achieved or the Kompressionskältekreis be switched on got to. If the outside temperature is sufficiently low, then only the cooling water circuit be used for the cooling by the three-way valve 48 to left side is opened and the cooling water in a closed circle the left chamber 12 of the three-media heat exchanger 10 flows through. Is the temperature while too low, so can already heated over the three-way valve 40 Cooling water from the return line 38 are mixed in the flow line.

Steigt die Außentemperatur an und die Kühlwirkung des Freikühlerkreises nicht mehr ausreichend, so kann unter Umständen der Freikühlerkreis noch zur Vorkühlung des Prozeßwassers benutzt werden. If the outside temperature increases and the cooling effect of the free cooling circuit does not increase more sufficient, then may be the free cooler circuit for pre-cooling of the process water.

Aus diesem Grunde durchläuft das Prozeßwasser zunächst die linke Kammer 12 in der Zeichnung, in der ein Wärmeaustausch mit dem Kühlwasser des Freikühlerkreises stattfindet, und anschließend die Kammer 14, die durch den Verdampfer des Kompressionskältekreises gebildet wird.For this reason, the process water first passes through the left chamber 12 in the drawing, in which a heat exchange with the cooling water of the free cooling circuit takes place, and then the chamber 14, passing through the evaporator the compression refrigeration cycle is formed.

Ist das Kühlwasser des Freikühlerkreises auch nicht mehr zur Vorkühlung des Prozeßwasser geeignet, so kann es zumindest noch in dem Kondensator-Wärmetauscher 50 des Kompressionskältekreislaufs verwendet werden, der nunmehr allein über die rechte Kammer 14 des Dreimedien-Wärmetauschers die Kühlung des Prozeßwassers vornimmt.Is the cooling water of the free cooling circuit also no longer for pre-cooling the Process water suitable, it may at least still in the condenser heat exchanger 50 of the compression refrigeration cycle are used now solely via the right-hand chamber 14 of the three-media heat exchanger, the cooling the process water makes.

Claims (5)

Temperiervorrichtung für Druckmaschinen,
   mit einer Kompressionskälteanlage mit einem Kondensator (50) und einem Verdampfer (10, 14), in der ein Kältemittel zirkuliert,
   einem Freikühlerkreis, in dem ein Kühlmittel, insbesondere Wasser zirkuliert,
   einem Prozeßwasserkreislauf, in dem ein Kühlmittel für Druckwalzen oder ein Feuchtmittel für den Offset-Druck zirkuliert und
   Wärmetauschermittel zur Kühlung des Prozeßwasserkreislaufs mithilfe der Kompressionskälteanlage und/oder des Freikühlerkreises,
   dadurch gekennzeichnet, dass ein Dreimedien-Wärmetauscher (10) vorgesehen ist, in dem der Prozeßwasserkreislauf sowohl mit dem Kompressionskältekreis als auch mit dem Freikühlerkreislauf in Wärmeaustausch gebracht wird.Tempering device for printing machines,
with a compression refrigeration system with a condenser (50) and an evaporator (10, 14) in which a refrigerant circulates,
a free cooling circuit in which a coolant, in particular water circulates,
a process water circuit in which a coolant for pressure rollers or a fountain solution for the offset pressure circulates and
Heat exchanger means for cooling the process water circuit by means of the compression refrigeration system and / or the free-cooling circuit,
characterized in that a three-media heat exchanger (10) is provided, in which the process water circuit is brought into heat exchange both with the Kompressionskältekreis and with the free cooling circuit. Temperiervorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Dreimedien-Wärmetauscher (10) zwei getrennte Kammern (12,14) aufweist, die von dem Kompressionskältekreis einerseits und dem Freikühlerkreis andererseits durchströmt werden und dass der Prozeßwasserkreislauf beide Kammern in einem getrennten Leitungssystem durchläuft.Temperature control device according to claim 1, characterized in that the three-media heat exchanger (10) has two separate chambers (12,14) which are traversed by the compression circuit on the one hand and the free cooling circuit on the other hand and that the process water circuit passes through both chambers in a separate line system. Temperiervorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Prozeßwasserkreislauf zunächst die Kammer (12), die mit dem Freikühlerkreis verbunden ist, und sodann die Kammer (14) durchläuft, die durch den Verdampfer des Kompressionskältekreislaufs gebildet wird. Temperature control device according to claim 2, characterized in that the process water circuit first the chamber (12) which is connected to the free cooling circuit, and then passes through the chamber (14), which is formed by the evaporator of the compression refrigeration cycle. Temperiervorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Freikühlerkreis parallel zu dem Dreimedien-Wärmetauscher (10) den Kondensator-Wärmetauscher (50) der Kompressionskälteanlage durchläuft.Temperature control device according to one of the preceding claims, characterized in that the free cooling circuit parallel to the three-medium heat exchanger (10) passes through the condenser heat exchanger (50) of the compression refrigeration system. Temperiervorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die von dem Kompressionskältekreis durchlaufende Kammer (14) des Dreimedien-Wärmetauschers (10) den Verdampfer der Kompressionskälteanlage bildet.Temperature control device according to one of Claims 1 to 3, characterized in that the chamber (14) of the three-medium heat exchanger (10) passing through the compression refrigeration cycle forms the evaporator of the compression refrigeration system.
EP04027325A 2003-11-21 2004-11-17 Device for controlling the temperature of a printing press Expired - Fee Related EP1533116B1 (en)

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DE10354454A DE10354454B4 (en) 2003-11-21 2003-11-21 Temperature control device for printing machines

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DE502004010104D1 (en) 2009-11-05
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US7159518B2 (en) 2007-01-09
EP1533116B1 (en) 2009-09-23
DE10354454A1 (en) 2005-06-30

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