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EP1654466A2 - Fluid cooling device - Google Patents

Fluid cooling device

Info

Publication number
EP1654466A2
EP1654466A2 EP04717626A EP04717626A EP1654466A2 EP 1654466 A2 EP1654466 A2 EP 1654466A2 EP 04717626 A EP04717626 A EP 04717626A EP 04717626 A EP04717626 A EP 04717626A EP 1654466 A2 EP1654466 A2 EP 1654466A2
Authority
EP
European Patent Office
Prior art keywords
fluid
cooling device
heat exchanger
storage tank
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04717626A
Other languages
German (de)
French (fr)
Other versions
EP1654466B1 (en
Inventor
Winfried Klein
Andreas Welsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydac System GmbH
Original Assignee
Hydac System GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hydac System GmbH filed Critical Hydac System GmbH
Publication of EP1654466A2 publication Critical patent/EP1654466A2/en
Application granted granted Critical
Publication of EP1654466B1 publication Critical patent/EP1654466B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/042—Controlling the temperature of the fluid
    • F15B21/0423—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00—Applications
    • F01P2050/02—Marine engines
    • F01P2050/06—Marine engines using liquid-to-liquid heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps

Definitions

  • the invention relates to a Fluidkuhlvomchtung as a unit with a drive motor - which drives a fan wheel and a fluid pump that promotes a first type of fluid in a fluid working group, which basically heats the fluid during operation, and leads to a heat exchanger from which the fluid returns cooled to the fluid working group.
  • EP 0 968 371 B1 discloses a fluid cooling device as a unit with a drive motor which drives a fan wheel and a fluid pump, which takes the fluid (hydraulic medium) from an oil tank and conveys it to a hydraulic working circuit which heats the fluid, and to a heat exchanger leads from which the fluid returns cooled to the oil container.
  • the oil container is trough-shaped, which, with its raised trough edges in the manner of a half-shell, at least partially encompasses the motor and the fluid pump.
  • the known solution provides an oil tank of relatively large volume, which is nevertheless a compact design and is a component of the fluid cooling device and, based on the installation space left free from the tub edges, furthermore good accessibility of the motor and fluid pump unit is ensured for assembly and maintenance purposes ,
  • a compact structure for the Fluid cooling device is also achieved that the mass components of the cooling device are evenly distributed, so that a stable position is achieved in operation even with appropriate own movements and vibrations.
  • a control system and a method for controlling the speed of a large number of fans for cooling a large number of fluids in a work machine is disclosed in DE 100 62 534 A1, the speed of each fan being controlled in accordance with the individual heat dissipation requirements of the special heat transfer cores, powered by this particular fan, the present control system having a plurality of sensors positioned to sense the temperature of each of the plurality of fluids, each sensor operable to output a signal representative of the temperature thereof displays particular fluid, and an electronic control device coupled to the plurality of sensors for receiving signals therefrom that record the temperature of each of the plurality of fluids.
  • the electronic control module can determine a corresponding temperature error for each of these fluids, and based on these temperature error signals and based on a certain logic programmed into the electronic control module, the control device outputs a signal to each of the plurality of Fans to individually control their speed, with each output signal indicating a desired fan speed for that particular fan.
  • the object of the invention is to further improve the known solutions in such a way that several temperature control tasks can be carried out with just one fluid cooling device.
  • a relevant object is achieved by a fluid cooling device with the features of claim 1 in its entirety.
  • a second type of fluid can be removed from a storage tank and conveyed into a second fluid working group by means of a second fluid pump of the device, the second type of fluid leading through the first and a second heat exchanger returns to the storage tank, different temperature control tasks for separate fluid working cycles can be solved with just one fluid cooling device.
  • the fluid cooling device according to the invention is particularly suitable for cooling electrical drives, such as linear motors, as are used, for example, in machining centers and machine tools, where the cooling of the electrical components takes place by means of a water-glycol mixture.
  • Use motor spindles, servomotors and similar devices are particularly suitable for cooling electrical drives, such as linear motors, as are used, for example, in machining centers and machine tools, where the cooling of the electrical components takes place by means of a water-glycol mixture.
  • the cooling medium in the form of the water-glycol mixture as a second type of fluid is passed on to a plate heat exchanger of the fluid cooling device and there cools in countercurrent the hydraulic medium of a hydraulic fluid working group, to which the machining center or the machine tool with its drivable components is also connected , As a result of the resulting heating, the water-glycol mixture is cooled via a second heat exchanger in the form of a lamella cooler before it returns to the storage tank of the fluid cooling device.
  • the hydraulic working medium is usually cold and can then be warmed up using the more heated water-glycol medium.
  • the only figure shows a rear view of the fluid cooling device as a structural unit in its installed position.
  • the fluid cooling device shown as a whole in the figure has an electric drive motor 10 which drives a fan wheel 12 with individual fan blades. Furthermore, the drive motor 10 drives a fluid pump 14.
  • the fan wheel 12 is accommodated in a fan wheel housing 16, which is preferably constructed from sheet metal parts. For safety, the fan wheel 12 is covered with a protective grille 18 in the rear area. Extending over the opening of the fan wheel housing 16 in the rear area is a flange part 20 provided with openings, on which the unit of the drive motor 10, fan wheel 12 and fluid pump 14 is mounted.
  • a heat exchanger 22 in the form of a plate heat exchanger is arranged above the fan wheel housing 16.
  • the fan wheel housing 16 is covered towards the front by a second heat exchanger 24 in the manner of a lamella cooler, which extends over the entire free opening cross section of the fan wheel opening 26.
  • the fan wheel 12 is designed in the manner of an axial suction fan which, seen in the direction of viewing the figure, draws air from right to left through the fins of the second heat exchanger 24 and brings it backwards into the rear area in the direction of the drive motor 10.
  • the fluid cooling device As an axial pressure fan.
  • the fan wheel housing 16 is designed in the manner of a hollow box and is arranged in a vertical arrangement on a storage tank 30 which, in order to increase its fluid volume in the rear region, forms an enlarged tank chamber volume in the vertical direction.
  • a submersible pump 32 Adjacent to the first drive motor 10, a submersible pump 32 is placed in the rear region of the storage tank 30, pump parts for a fluid withdrawal from the storage tank 30 projecting into the latter (not shown). Accordingly, the drive motor 34 of the submersible pump 32 is shown in the figure.
  • the submersible pump 32 in question has a pump opening 36 for the removal of fluid from the storage tank 30.
  • the pump opening 36 supplies a fluid working circuit (not shown in more detail) which is preferably used to cool an electrical linear drive of a machining center or a machine tool.
  • a water-glycol mixture (second type of fluid) is used as the fluid, and after passing through the electrical consumer to cool it, the water-glycol mixture is introduced into the plate heat exchanger 22 via the submersible pump 32, specifically via a corresponding one Piping, not shown, which opens into the lower connection point 38 of the plate heat exchanger 22. From there, the second type of fluid (water-glycol mixture) flows through the plate heat exchanger 22 and leaves it via the lower discharge connection 40.
  • the relevant discharge connection 40 is in turn connected to the second heat exchanger 24 in a fluid-carrying manner by means of a cross tube 42, and the water-glycol mixture heated in the plate heat exchanger 22 becomes in operation of the fan wheel 12 by means of cooling air in the second heat exchanger 24 Form of the fin cooler cooled by the water-glycol mixture passes through the second heat exchanger 24.
  • the water-glycol mixture passes back through the connecting pipe 44 into the storage tank 30, which in this respect establishes the connection between the top of the storage tank 30 and the top of the second heat exchanger 24 in a fluid-carrying manner.
  • the water-glycol mixture in question is available in a cooled state for a new circulation process by means of the submersible pump 32.
  • the already mentioned fluid pump 14 serves to deliver a first type of fluid in the form of a hydraulic medium, such as hydraulic oil.
  • a hydraulic medium such as hydraulic oil.
  • the storage tank for the hydraulic oil is located outside the fluid cooling device shown in the figure, so that from there the fluid pump 14 sucks in the hydraulic oil via its suction opening 46 and passes it on to its pump line 48.
  • the fluid line pump line 48 in this regard is in turn connected to the plate heat exchanger 22 above the discharge connection 40 via an inlet opening 50.
  • the hydraulic oil enters the plate heat exchanger 22 via the relevant inlet opening 50 and flows through it in countercurrent to the water-glycol mixture coming from left to right.
  • the hydraulic oil cooled or tempered in this way then returns via the outlet 52, which is arranged above the lower connection point 38, back to the hydraulic working circuit, not shown, to which the hydraulic unit and the hydraulic tank of the overall system are connected.
  • the fluid cooling device according to the invention it is thus possible to cool heated hydraulic oil of a system via the plate heat exchanger 22, the cooling or tempering in question taking place in countercurrent via the water-glycol mixture which is stored in the storage tank 30 by the submersible pump 32 for a circulation is promoted.
  • the water-glycol mixture heated in the plate heat exchanger 22 is then cooled in the further circulation via the lamella cooler 24.
  • the fluid cooling device shown can also be provided for other applications in which temperature control tasks for different fluid circuits occur. There is also the possibility of installing or attaching separable tank chambers to the storage tank 30, so that fluid storage of further fluid media can take place via the storage tank of the fluid cooling device as a structural unit. In addition to the fluid pump 14 shown and the submersible pump 32, there is also the possibility of attaching further pumps in addition to further heat exchangers 22, 24 (not shown) in order to control more than two fluid media in terms of temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The liquid cooling device has a drive motor (10) for a fan wheel (12) and a fluid pump (14) pumping a first fluid through a circuit and a first heat exchanger (22). A second fluid pump (32) pumps a second form of fluid through a second circuit, taking the second fluid via the first heat exchanger (22) and a second one (24) back to the storage tank (30).

Description

Fluidkuhlvomchtung Fluidkuhlvomchtung
Die Erfindung betrifft eine Fluidkuhlvomchtung als Baueinheit mit einem Antriebsmotor- der ein Lüfterrad sowie eine Fluidpumpe antreibt, die eine erste Art an Fluid in einen Fluid-Arbeitskreis fördert, der im Betrieb grundsätzlich das Fluid erwärmt, sowie zu einem Wärmetauscher führt, aus dem das Fluid gekühlt in den Fluid-Arbeitskreis zurückkehrt.The invention relates to a Fluidkuhlvomchtung as a unit with a drive motor - which drives a fan wheel and a fluid pump that promotes a first type of fluid in a fluid working group, which basically heats the fluid during operation, and leads to a heat exchanger from which the fluid returns cooled to the fluid working group.
Durch die EP 0 968 371 B1 ist eine Fluidkuhlvomchtung als Baueinheit mit einem Antriebsmotor bekannt, der ein Lüfterrad sowie eine Fluidpumpe antreibt, die Fluid (Hydraulikmedium) aus einem Ölbehälter nimmt und in einen hydraulischen Arbeitskreis fördert, der das Fluid erwärmt, sowie zu einem Wärmetauscher führt, aus dem das Fluid gekühlt in den Ölbehälter zurückkehrt. Bei der bekannten Lösung ist der Ölbehälter wannenförm ig ausgebildet, der mit seinen hochgezogenen Wannenrändern in der Art einer Halbschale zumindest den Motor und die Fluidpumpe teilweise umfaßt. Demgemäß ist mit der bekannten Lösung ein relativ großvolumig aufbauender Ölbehälter gegeben, der dennoch platzsparend in Kompaktbauweise Bestandteil der Fluidkuhlvomchtung ist und ausgehend von dem von den Wannenrändern freigelassenen Bauraum ist darüber hinaus zu Montage- und Wartungszwecken eine gute Zugänglichkeit der Motor- und Fluidpum- penbaueinheit gewährleistet. Neben einem kompakten Aufbau für die Fluidkuhlvomchtung wird darüber hinaus erreicht, dass die Massekomponenten der Kühlvorrichtung gleichmäßig verteilt sind, so dass im Betrieb auch bei entsprechenden Eigenbewegungen und Vibrationen ein sicherer Stand erreicht ist.EP 0 968 371 B1 discloses a fluid cooling device as a unit with a drive motor which drives a fan wheel and a fluid pump, which takes the fluid (hydraulic medium) from an oil tank and conveys it to a hydraulic working circuit which heats the fluid, and to a heat exchanger leads from which the fluid returns cooled to the oil container. In the known solution, the oil container is trough-shaped, which, with its raised trough edges in the manner of a half-shell, at least partially encompasses the motor and the fluid pump. Accordingly, the known solution provides an oil tank of relatively large volume, which is nevertheless a compact design and is a component of the fluid cooling device and, based on the installation space left free from the tub edges, furthermore good accessibility of the motor and fluid pump unit is ensured for assembly and maintenance purposes , In addition to a compact structure for the Fluid cooling device is also achieved that the mass components of the cooling device are evenly distributed, so that a stable position is achieved in operation even with appropriate own movements and vibrations.
Ein Steuersystem und ein Verfahren zur Steuerung der Drehzahl einer Vielzahl von Ventilatoren zur Kühlung einer Vielzahl von Strömungsmitteln in einer Arbeitsmaschine ist in der DE 100 62 534 A1 offenbart, wobei die Drehzahl von jedem Ventilator gemäß der einzelnen Wärmeableitungsan- forderungen der speziellen Wärmeübertragungskerne gesteuert wird, die von diesem speziellen Ventilator versorgt werden, wobei das vorliegende Steuersystem eine Vielzahl von Sensoren aufweist, die positioniert sind, um die Temperatur von jeden der Vielzahl von Strömungsmitteln abzufühlen, wobei jeder Sensor betreibbar ist, um ein Signal auszugeben, das die Tem- peratur dieses speziellen Strömungsmittels anzeigt, und eine elektronische Steuervorrichtung, die mit der Vielzahl von Sensoren gekoppelt ist, um Signale davon aufzunehmen, die die Temperatur von jedem der Vielzahl von Strömungsmittel aufnehmen. Basierend auf diesen Temperatursignalen kann bei der bekannten Vorrichtung das elektronische Steuermodul einen ent- sprechenden Temperaturfehler für jedes dieser Strömungsmittel bestimmen, und basierend auf diesen Temperaturfehlersignalen und basierend auf einer gewissen in das elektronische Steuermodul einprogrammierten Logik, gibt die Steuervorrichtung ein Signal an jeden der Vielzahl von Ventilatoren aus, um individuell ihre Drehzahl zu steuern, wobei jedes Ausgangssignal eine erwünschte Ventilatordrehzahl für diesen speziellen Ventilator anzeigt.A control system and a method for controlling the speed of a large number of fans for cooling a large number of fluids in a work machine is disclosed in DE 100 62 534 A1, the speed of each fan being controlled in accordance with the individual heat dissipation requirements of the special heat transfer cores, powered by this particular fan, the present control system having a plurality of sensors positioned to sense the temperature of each of the plurality of fluids, each sensor operable to output a signal representative of the temperature thereof displays particular fluid, and an electronic control device coupled to the plurality of sensors for receiving signals therefrom that record the temperature of each of the plurality of fluids. Based on these temperature signals, in the known device the electronic control module can determine a corresponding temperature error for each of these fluids, and based on these temperature error signals and based on a certain logic programmed into the electronic control module, the control device outputs a signal to each of the plurality of Fans to individually control their speed, with each output signal indicating a desired fan speed for that particular fan.
Mit den vorstehend bekannten Lösungen läßt sich jedoch immer nur eine Kühlaufgabe realisieren, d.h. erwärmtes Fluid einer ersten Art, beispielsweise in Form von Hydraulikmedium, effizient abkühlen. Für andere Kühl- und Temperieraufgaben, beispielsweise ein Fluid eines zweiten hydraulischen Arbeitskreises (Getriebeöl) abzukühlen, sind die bekannten Vorrichtungen erneut vorzusehen, so dass man demzufolge für jeden hydraulischen Kreislauf und jede Kühlaufgabenstellung eine eigenständige Kühlvorrichtung benötigt mit Antriebsmotor, Pumpe und Kühler.With the solutions known above, however, only one cooling task can be implemented, ie, efficient heating of heated fluid of a first type, for example in the form of hydraulic medium. For other cooling and Tempering tasks, for example cooling a fluid of a second hydraulic working group (gear oil), the known devices have to be provided again, so that for each hydraulic circuit and each cooling task, an independent cooling device with drive motor, pump and cooler is required.
Ausgehend von diesem Stand der Technik stellt sich die Erfindung die Aufgabe, die bekannten Lösungen dahingehend weiter zu verbessern, dass mit nur einer Fluidkühlvorrichtung sich mehrere Temperieraufgaben erledigen lassen. Eine dahingehende Aufgabe löst eine Fluidkühlvorrichtung mit den Merkmalen des Patentanspruches 1 in seiner Gesamtheit.Proceeding from this prior art, the object of the invention is to further improve the known solutions in such a way that several temperature control tasks can be carried out with just one fluid cooling device. A relevant object is achieved by a fluid cooling device with the features of claim 1 in its entirety.
Dadurch, dass gemäß dem kennzeichnenden Teil des Patentanspruches 1 mittels einer zweiten Fluidpumpe der Vorrichtung eine zweite Art an Fluid aus einem Vorratstank entnehmbar und in einen zweiten Fluid-Arbeitskreis förderbar ist, von dem über den ersten und einen zweiten Wärmetauscher führend die zweite Art an Fluid in den Vorratstank zurückkehrt, lassen sich mit nur einer Fluidkühlvorrichtung verschiedene Temperieraufgaben für getrennte Fluid-Arbeitskreisläufe lösen. Ferner ist es mit der erfindungsge- mäßen Lösung möglich, insbesondere über den ersten Wärmetauscher, einen Wärmeaustausch zwischen den beiden Arten an Fluid vorzunehmen, was zum einen zu einem homogeneren Wärmezustand für die beiden Fluidmedien führt und zum anderen auch den Vorteil bieten kann, beim Anfahren von Maschinen- und Anlagenteilen relativ kaltes Betriebsfluid des einen Kreises über das dann gegebenenfalls wärmere Fluidmedium des anderen Kreises zu erwärmen, um dergestalt die Funktionssicherheit und die Betriebsgenauigkeit deutlich zu erhöhen. Die erfindungsgemäße Fluidkühlvorrichtung eignet sich besonders für das Abkühlen von elektrischen Antrieben, wie Linearmotoren, wie sie beispielhaft bei Bearbeitungszentren und Werkzeugmaschinen eingesetzt werden, wo mittels einer Wasser-Glycol-Mischung die Kühlung der elektrischen Komponenten erfolgt.- Ferner läßt sie sich für sonstige Linearmotoren, Motorspindeln, Servomotoren und vergleichbare Einrichtungen einsetzen. Das Kühlmedium in Form der Wasser-Glycol-Mischung als zweiter Art an Fluid wird an einen Plattenwärmetauscher der Fluidkühlvorrichtung weitergegeben und kühlt dort im Gegenstrom Hydraulikmedium eines hydraulischen Fluid-Arbeitskreises ab, an den gleichfalls das Bearbeitungszentrum bzw. die Werkzeugmaschine mit ihren antreibbaren Komponenten angeschlossen ist. Durch die dadurch bedingte Erwärmung wird die Wasser-Glycol- Mischung, bevor sie in den Vorratstank der Fluidkühlvorrichtung zurückgelangt, über einen zweiten Wärmetauscher in Form eines Lamellenkühlers abgekühlt. Beim Anfahren, also bei der Inbetriebnahme des hydraulischen Arbeitskreises mit angeschlossenem Bearbeitungszentrum oder Werkzeugmaschine ist das hydraulische Arbeitsmedium in der Regel kalt und kann dann über das höher erwärmte Wasser-Glycol-Medium aufgewärmt werden. Dergestalt ist ein funktionssicherer und genauer Betriebsstart erreicht. Weiterhin läßt sich dergestalt das Verhältnis der Temperaturen zwischen elektrischen Komponenten und dem Hydraul iköl des Hydraul ikölkreises optimieren, was gleichfalls deutlich zur Verbesserung der Maschinengenauigkeit mit beiträgt. Weitere vorteilhafte Ausführungsformen sind Gegenstand der sonstigen Unteransprüche. Im folgenden wird die erfindungsgemäße Fluidkühlvorrichtung in prinzipieller und nicht maßstäblicher Darstellung eines Ausführungsbeispiels nach der Zeichnung näher erläutert.Characterized in that, according to the characterizing part of patent claim 1, a second type of fluid can be removed from a storage tank and conveyed into a second fluid working group by means of a second fluid pump of the device, the second type of fluid leading through the first and a second heat exchanger returns to the storage tank, different temperature control tasks for separate fluid working cycles can be solved with just one fluid cooling device. Furthermore, with the solution according to the invention, it is possible, in particular via the first heat exchanger, to carry out a heat exchange between the two types of fluid, which on the one hand leads to a more homogeneous heat state for the two fluid media and on the other hand can also offer the advantage when starting up of machine and system parts to heat relatively cold operating fluid of one circuit via the then possibly warmer fluid medium of the other circuit in order to significantly increase the functional reliability and the operating accuracy. The fluid cooling device according to the invention is particularly suitable for cooling electrical drives, such as linear motors, as are used, for example, in machining centers and machine tools, where the cooling of the electrical components takes place by means of a water-glycol mixture. Use motor spindles, servomotors and similar devices. The cooling medium in the form of the water-glycol mixture as a second type of fluid is passed on to a plate heat exchanger of the fluid cooling device and there cools in countercurrent the hydraulic medium of a hydraulic fluid working group, to which the machining center or the machine tool with its drivable components is also connected , As a result of the resulting heating, the water-glycol mixture is cooled via a second heat exchanger in the form of a lamella cooler before it returns to the storage tank of the fluid cooling device. When starting up, i.e. when starting up the hydraulic working group with a connected machining center or machine tool, the hydraulic working medium is usually cold and can then be warmed up using the more heated water-glycol medium. In this way, a reliable and precise start of operation is achieved. Furthermore, the ratio of the temperatures between electrical components and the hydraulic oil of the hydraulic oil circuit can be optimized in this way, which likewise contributes significantly to improving the machine accuracy. Further advantageous embodiments are the subject of the other subclaims. The fluid cooling device according to the invention is explained in more detail below in a basic and not to scale illustration of an exemplary embodiment according to the drawing.
Dabei zeigt die einzige Figur in rückwärtiger Ansicht die Fluidkühlvorrich- tung als Baueinheit in ihrer Einbaulage.The only figure shows a rear view of the fluid cooling device as a structural unit in its installed position.
Die in der Figur als Ganzes gezeigte Fluidkühlvorrichtung weist einen elek- trischen Antriebsmotor 10 auf, der ein Lüfterrad 12 mit einzelnen Lüfterflügeln antreibt. Ferner treibt der Antriebsmotor 10 eine Fluidpumpe 14 an. Das Lüfterrad 12 ist in einem Lüfterradgehäuse 16 aufgenommen, das vorzugsweise aus Blechteilen aufgebaut ist. Zur Sicherheit ist im rückwärtigen Bereich das Lüfterrad 12 mit einem Schutzgitter 18 abgedeckt. Über die Öffnung des Lüfterradgehäuses 16 erstreckt sich im hinteren Bereich ein mit Durchbrechungen versehenes Flanschteil 20, an dem die Einheit von Antriebsmotor 10, Lüfterrad 12 und Fluidpumpe 14 gelagert ist. Oberhalb des Lüfterradgehäuses 16 ist ein Wärmetauscher 22 angeordnet in Form eines Plattenwärmetauschers. Des weiteren ist nach vorne hin das Lüfterradge- häuse 16 von einem zweiten Wärmetauscher 24 in der Art eines Lamellenkühlers abgedeckt, der sich über den gesamten freien Öffnungsquerschnitt der Lüfterradöffnung 26 erstreckt. Das Lüfterrad 12 ist in der Art eines axialen Sauglüfters konzipiert, das in Blickrichtung auf die Figur gesehen von rechts nach links Luft durch die Lamellen des zweiten Wärmetauschers 24 zieht und nach hinten in den rückwärtigen Bereich in Richtung des Antriebsmotors 10 bringt. Bei geeigneter Anpassung ist es aber auch möglich, die dahingehende Luftströmung umzukehren und die Fluidkühlvorrichtung als axialen Drucklüfter zu konzipieren. Um die Lamellen des Lamellenkühlers (zweiter Wärmetau- scher) 24 von Verschmutzungen freizuhalten, ist dieser an seiner freien Stirnseite von einem plattenförmigen Luftfilter 28 überdeckt. Das Lüfterradgehäuse 16 ist in der Art eines Hohlkastens konzipiert und steht in senkrechter Anordnung auf einem Vorratstank 30, der zur Vergrößerung seines Fluidvolumens im rückwärtigen Bereich in vertikaler Richtung ein vergrößertes Tankkammervolumen ausbildet. Benachbart zu dem ersten Antriebsmotor 10 ist im hinteren Bereich des Vorratstanks 30 auf diesem eine Tauchpumpe 32 aufgesetzt, wobei Pumpenteile für eine Fluidentnahme aus dem Vorratstank 30 in diesen hineinragen (nicht dargestellt). Demgemäß ist in der Figur sichtbar der Antriebsmotor 34 der Tauchpumpe 32 dargestellt. Die dahingehende Tauchpumpe 32 weist eine Pumpöffnung 36 für die Entnahme von Fluid aus dem Vorratstank 30 auf.The fluid cooling device shown as a whole in the figure has an electric drive motor 10 which drives a fan wheel 12 with individual fan blades. Furthermore, the drive motor 10 drives a fluid pump 14. The fan wheel 12 is accommodated in a fan wheel housing 16, which is preferably constructed from sheet metal parts. For safety, the fan wheel 12 is covered with a protective grille 18 in the rear area. Extending over the opening of the fan wheel housing 16 in the rear area is a flange part 20 provided with openings, on which the unit of the drive motor 10, fan wheel 12 and fluid pump 14 is mounted. A heat exchanger 22 in the form of a plate heat exchanger is arranged above the fan wheel housing 16. Furthermore, the fan wheel housing 16 is covered towards the front by a second heat exchanger 24 in the manner of a lamella cooler, which extends over the entire free opening cross section of the fan wheel opening 26. The fan wheel 12 is designed in the manner of an axial suction fan which, seen in the direction of viewing the figure, draws air from right to left through the fins of the second heat exchanger 24 and brings it backwards into the rear area in the direction of the drive motor 10. With a suitable adaptation, however, it is also possible to reverse the air flow in question and to design the fluid cooling device as an axial pressure fan. Around the fins of the finned cooler (second heat exchanger shear) 24 to keep it free of dirt, this is covered on its free end face by a plate-shaped air filter 28. The fan wheel housing 16 is designed in the manner of a hollow box and is arranged in a vertical arrangement on a storage tank 30 which, in order to increase its fluid volume in the rear region, forms an enlarged tank chamber volume in the vertical direction. Adjacent to the first drive motor 10, a submersible pump 32 is placed in the rear region of the storage tank 30, pump parts for a fluid withdrawal from the storage tank 30 projecting into the latter (not shown). Accordingly, the drive motor 34 of the submersible pump 32 is shown in the figure. The submersible pump 32 in question has a pump opening 36 for the removal of fluid from the storage tank 30.
Die dahingehende Pumpöffnung 36 versorgt einen nicht näher dargestellten Fluid-Arbeitskreis, der vorzugsweise zur Kühlung eines elektrischen Linearantriebes eines Bearbeitungszentrums oder einer Werkzeugmaschine dient. Als Fluid kommt dabei insbesondere eine Wasser-Glycol-Mischung (zweite Art an Fluid) zum Einsatz und nach Durchlaufen des elektrischen Verbrauchers zu seiner Kühlung wird über die Tauchpumpe 32 die Wasser-Glycol- Mischung in den Plattenwärmetauscher 22 eingebracht, und zwar über eine entsprechende, nicht näher dargestellte Verrohrung, die in die untere Anschlußstelle 38 des Plattenwärmetauschers 22 mündet. Von dort aus durchströmt die zweite Art an Fluid (Wasser-Glycol-Mischung) den Plattenwärmetauscher 22 und verläßt diesen über den unteren Abgabeanschluß 40.The pump opening 36 supplies a fluid working circuit (not shown in more detail) which is preferably used to cool an electrical linear drive of a machining center or a machine tool. In particular, a water-glycol mixture (second type of fluid) is used as the fluid, and after passing through the electrical consumer to cool it, the water-glycol mixture is introduced into the plate heat exchanger 22 via the submersible pump 32, specifically via a corresponding one Piping, not shown, which opens into the lower connection point 38 of the plate heat exchanger 22. From there, the second type of fluid (water-glycol mixture) flows through the plate heat exchanger 22 and leaves it via the lower discharge connection 40.
Der dahingehende Abgabeanschluß 40 ist wiederum mittels eines Querrohres 42 fluidführend mit dem zweiten Wärmetauscher 24 verbunden und die im Platten Wärmetauscher 22 erwärmte Wasser-Glycol-Mischung wird bei Betrieb des Lüfterrades 12 mittels Kühlluft im zweiten Wärmetauscher 24 in Form des Lamellenkühlers gekühlt, indem die Wasser-Glycol-Mischung dahingehend den zweiten Wärmetauscher 24 durchläuft. Nach Durchlaufen dieses Kühlschrittes gelangt die Wasser-Glycol-Mischung über das Anschlußrohr 44 zurück in den Vorratstank 30, das insoweit die Verbindung zwischen Oberseite des Vorratstanks 30 und Oberseite des zweiten Wärmetauschers 24 fluidführend herstellt. Nach Rückgabe in den Vorratstank 30 steht die dahingehende Wasser-Glycol-Mischung gekühlt für einen neuen Umlaufvorgang mittels der Tauchpumpe 32 zur Verfügung.The relevant discharge connection 40 is in turn connected to the second heat exchanger 24 in a fluid-carrying manner by means of a cross tube 42, and the water-glycol mixture heated in the plate heat exchanger 22 becomes in operation of the fan wheel 12 by means of cooling air in the second heat exchanger 24 Form of the fin cooler cooled by the water-glycol mixture passes through the second heat exchanger 24. After passing through this cooling step, the water-glycol mixture passes back through the connecting pipe 44 into the storage tank 30, which in this respect establishes the connection between the top of the storage tank 30 and the top of the second heat exchanger 24 in a fluid-carrying manner. After returning to the storage tank 30, the water-glycol mixture in question is available in a cooled state for a new circulation process by means of the submersible pump 32.
Die bereits erwähnte Fluidpumpe 14 dient der Förderung einer ersten Art an Fluid in Form eines hydraulischen Mediums, wie Hydrauliköl. Mit dem dahingehenden Hydrauliköl lassen sich hydraulische Aggregate eines Bearbeitungszentrums oder einer Werkzeugmaschine sinnfällig ansteuern und betreiben. Der Vorratstank befindet sich für das Hydrauliköl dabei außer- halb der in der Figur gezeigten Fluidkühlvorrichtung, so dass von dort aus die Fluidpumpe 14 über ihre Ansaugöffnung 46 das Hydrauliköl ansaugt und an ihre Pumpleitung 48 weitergibt. Die dahingehend fluidführende Pumpleitung 48 ist wiederum oberhalb des Abgabeanschlusses 40 über eine Eingangsöffnung 50 an den Plattenwärmetauscher 22 angeschlossen. Über die dahingehende Eingangsöffnung 50 gelangt das Hydrauliköl in den Plattenwärmetauscher 22 und durchströmt diesen im Gegenstrom zu der Wasser-Glycol-Mischung von links nach rechts kommend. Anschließend gelangt das derart gekühlte oder temperierte Hydrauliköl über den Auslaß 52, der oberhalb der unteren Anschlußstelle 38 angeordnet ist, zurück in den nicht näher dargestellten hydraulischen Arbeitskreis, an den das hydraulische Aggregat sowie der Hydrauliktank der Gesamtanlage angeschlossen sind. Mit der erfindungsgemäßen Fluidkühlvorrichtung ist es also möglich, erwärmtes Hydrauliköl einer Anlage über den Platten Wärmetauscher 22 zu kühlen, wobei die dahingehende Kühlung oder Temperierung im Gegenstrom über die Wasser-Glycol-Mischung erfolgt, die im Vorratstank 30 be- vorratet von der Tauchpumpe 32 für einen Umlauf gefördert wird. Die im Plattenwärmetauscher 22 erwärmte Wasser-Glycol-Mischung wird dann über den Lamellenkühler 24 im weiteren Umlauf gekühlt. Ist das Hydrauliköl zum Beginn des Betriebes der hydraulischen Anlage kalt, besteht dergestalt die Möglichkeit, das kalte Hydrauliköl über die gegebenenfalls wärme- re Wasser-Glycol-Mischung anzuwärmen und dergestalt den Betriebsbeginn zu erleichtern. Des weiteren kommt es im Hinblick auf die Schnittstelle in Form des ersten Wärmetauschers 22 zu einer Homogenisierung des Temperaturverhaltens in den beiden Kreisen, was sich wiederum auf die Bearbeitungsgenauigkeit für die gesamte Anlage auswirkt.The already mentioned fluid pump 14 serves to deliver a first type of fluid in the form of a hydraulic medium, such as hydraulic oil. With the hydraulic oil in question, hydraulic units of a machining center or a machine tool can be controlled and operated. The storage tank for the hydraulic oil is located outside the fluid cooling device shown in the figure, so that from there the fluid pump 14 sucks in the hydraulic oil via its suction opening 46 and passes it on to its pump line 48. The fluid line pump line 48 in this regard is in turn connected to the plate heat exchanger 22 above the discharge connection 40 via an inlet opening 50. The hydraulic oil enters the plate heat exchanger 22 via the relevant inlet opening 50 and flows through it in countercurrent to the water-glycol mixture coming from left to right. The hydraulic oil cooled or tempered in this way then returns via the outlet 52, which is arranged above the lower connection point 38, back to the hydraulic working circuit, not shown, to which the hydraulic unit and the hydraulic tank of the overall system are connected. With the fluid cooling device according to the invention, it is thus possible to cool heated hydraulic oil of a system via the plate heat exchanger 22, the cooling or tempering in question taking place in countercurrent via the water-glycol mixture which is stored in the storage tank 30 by the submersible pump 32 for a circulation is promoted. The water-glycol mixture heated in the plate heat exchanger 22 is then cooled in the further circulation via the lamella cooler 24. If the hydraulic oil is cold at the start of the operation of the hydraulic system, there is the possibility of heating the cold hydraulic oil via the possibly warmer water-glycol mixture and thus of facilitating the start of operation. Furthermore, with regard to the interface in the form of the first heat exchanger 22, there is a homogenization of the temperature behavior in the two circles, which in turn has an effect on the machining accuracy for the entire system.
Die gezeigte Fluidkühlvorrichtung kann auch für andere Anwendungen vorgesehen sein, bei denen Temperieraufgaben für verschiedene Fluidkreise anfallen. Ferner besteht die Möglichkeit, in den Vorratstank 30 separierba- reTankkammern ein- oder anzubringen, so dass eine Fluidbevorratung wei- terer Fluidmedien über den Vorratstank der Fluidkühlvorrichtung als Baueinheit erfolgen kann. Auch besteht die Möglichkeit, neben der gezeigten Fluidpumpe 14 und der Tauchpumpe 32 weitere Pumpen anzubringen nebst weiteren Wärmetauschern 22,24 (nicht dargestellt), um dergestalt mehr als zwei Fluidmedien temperaturmäßig anzusteuern. The fluid cooling device shown can also be provided for other applications in which temperature control tasks for different fluid circuits occur. There is also the possibility of installing or attaching separable tank chambers to the storage tank 30, so that fluid storage of further fluid media can take place via the storage tank of the fluid cooling device as a structural unit. In addition to the fluid pump 14 shown and the submersible pump 32, there is also the possibility of attaching further pumps in addition to further heat exchangers 22, 24 (not shown) in order to control more than two fluid media in terms of temperature.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Fluidkühlvorrichtung als Baueinheit mit einem Antriebsmotor (10), der ein Lüfterrad (12) sowie eine Fluidpumpe (14) antreibt, die eine erste Art an Fluid in einen Fluid-Arbeitskreis fördert, sowie zu einem Wärmetauscher (22) führt, aus dem das Fluid temperiert in den Fluid-Arbeitskreis zurückkehrt, dadurch gekennzeichnet, dass mittels einer zweiten Fluidpumpe (32) eine zweite Art an Fluid aus einem Vorratstank (30) entnehmbar und in einen zweiten Fluid-Arbeitskreis förderbar ist, von dem über den ersten (22) und den zweiten Wärmetauscher (24) führend die zweite Art an Fluid in den Vorratstank (30) zurückkehrt.1. Fluid cooling device as a unit with a drive motor (10) which drives a fan wheel (12) and a fluid pump (14), which promotes a first type of fluid in a fluid working circuit, and leads to a heat exchanger (22) from which the temperature of the fluid returns to the fluid working circuit, characterized in that a second type of fluid can be removed from a storage tank (30) by means of a second fluid pump (32) and conveyed into a second fluid working circuit, from which the first (22 ) and the second heat exchanger (24) leading the second type of fluid returns to the storage tank (30).
2. Fluidkühlvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der erste Wärmetauscher (22) ein Plattenwärmetauscher ist, der den Austausch von Wärme zwischen den beiden Arten an Fluid ermöglicht.2. Fluid cooling device according to claim 1, characterized in that the first heat exchanger (22) is a plate heat exchanger which enables the exchange of heat between the two types of fluid.
3. Fluidkühlvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der zweite Wärmetauscher (24) ein Lamellenkühler ist, der Kühlluft von dem antreibbaren Lüfterrad (12) erhält zur Kühlung der zweiten Art an Fluid.3. Fluid cooling device according to claim 1 or 2, characterized in that the second heat exchanger (24) is a lamella cooler which receives cooling air from the drivable fan wheel (12) for cooling the second type of fluid.
4. Fluidkühlvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Arten an Fluid aus einem Hydraulikmedium bestehen, wobei die erste Art an Fluid ein Hydrauliköl und die zweite Art an Fluid eine Wasser-Glycol-Mischung ist.4. Fluid cooling device according to one of claims 1 to 3, characterized in that the types of fluid consist of a hydraulic medium, wherein the first type of fluid is a hydraulic oil and the second type of fluid is a water-glycol mixture.
5. Fluidkühlvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Vorratstank (30) integraler Bestandteil der Vorrichtung ist. 5. Fluid cooling device according to one of claims 1 to 4, characterized in that the storage tank (30) is an integral part of the device.
6. Fluidkühlvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die zweite Fluidpumpe (32) in der Art einer Tauchpumpe ausgebildet ist, die mit ihrem elektrischen Antriebsmotor (34) auf dem Vorratstank (30) aufgesetzt ist.6. Fluid cooling device according to one of claims 1 to 5, characterized in that the second fluid pump (32) is designed in the manner of a submersible pump which is placed with its electric drive motor (34) on the storage tank (30).
7. Fluidkühlvorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass neben dem ersten Vorratstank (30) für die Wasser-Glycol-Mischung ein zweiter Vorratstank vorhanden ist zur Bevorratung von Hydrauliköl.7. Fluid cooling device according to claim 6, characterized in that in addition to the first storage tank (30) for the water-glycol mixture, there is a second storage tank for storing hydraulic oil.
8. Fluidkühlvorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Antriebsachsen der beiden Fluidpumpen (14,32) innerhalb der Vorrichtung senkrecht zueinander verlaufen.8. Fluid cooling device according to one of claims 1 to 7, characterized in that the drive axes of the two fluid pumps (14.32) run perpendicular to each other within the device.
9. Fluidkühlvorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der anschließbare erste Fluid-Arbeitskreis ein Hy- draulikaggregat und der anschließbare zweite Fluid-Arbeitskreis mindestens einen elektrischen Antrieb, wie einen Linearmotor od. dgl., aufweist. 9. Fluid cooling device according to one of claims 1 to 8, characterized in that the connectable first fluid working circuit has a hydraulic unit and the connectable second fluid working circuit has at least one electric drive, such as a linear motor or the like.
EP04717626A 2003-07-10 2004-03-05 Fluid cooling device Expired - Lifetime EP1654466B1 (en)

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DE10331216A DE10331216B3 (en) 2003-07-10 2003-07-10 Liquid cooling device for cooling liquid has second fluid pump pumping second form of fluid through second circuit
PCT/EP2004/002237 WO2005005843A1 (en) 2003-07-10 2004-03-05 Fluid cooling device

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JP (1) JP4523591B2 (en)
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EP1654466B1 (en) 2008-04-02
WO2005005843A8 (en) 2005-08-11
US20070163759A1 (en) 2007-07-19
CN100494699C (en) 2009-06-03
CN1820149A (en) 2006-08-16
JP4523591B2 (en) 2010-08-11
DE10331216B3 (en) 2004-09-09
US7793707B2 (en) 2010-09-14
JP2007524044A (en) 2007-08-23
DE502004006730D1 (en) 2008-05-15
ATE391241T1 (en) 2008-04-15

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