WO2012016668A1 - Hydraulic preheating apparatus for hydraulic oil coolers in a large hydraulic excavator - Google Patents

Hydraulic preheating apparatus for hydraulic oil coolers in a large hydraulic excavator Download PDF

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Publication number
WO2012016668A1
WO2012016668A1 PCT/EP2011/003823 EP2011003823W WO2012016668A1 WO 2012016668 A1 WO2012016668 A1 WO 2012016668A1 EP 2011003823 W EP2011003823 W EP 2011003823W WO 2012016668 A1 WO2012016668 A1 WO 2012016668A1
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WO
WIPO (PCT)
Prior art keywords
hydraulic oil
oil cooler
hydraulic
outlet box
pressure
Prior art date
Application number
PCT/EP2011/003823
Other languages
German (de)
French (fr)
Inventor
Reinhard Emminger
Wilfried Busse
Original Assignee
Bucyrus Hex 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 Bucyrus Hex Gmbh filed Critical Bucyrus Hex Gmbh
Priority to AU2011287925A priority Critical patent/AU2011287925A1/en
Priority to EP11752463.7A priority patent/EP2601390A1/en
Priority to US13/813,364 priority patent/US20130213633A1/en
Priority to CN201180047919.0A priority patent/CN103140654B/en
Publication of WO2012016668A1 publication Critical patent/WO2012016668A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/002—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/005—Controlling temperature of lubricant
    • F01M5/007—Thermostatic control
    • 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
    • F15B21/0427—Heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/05316—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/12—Safety or protection arrangements; Arrangements for preventing malfunction for preventing overpressure

Definitions

  • Hydraulic preheater for hydraulic oil cooler in one
  • the innovation relates to a device for preheating hydraulic oil according to the generic part of the first claim.
  • An air-cooled hydraulic oil cooler is constructed in many ways in lamellae flowing through the oil, air-flow fins and two collecting tanks for the inflowing and outflowing oil.
  • CONFIRMATION COPY Oil is still cold and can not be rinsed out fast enough, the prevailing in the system back pressure can exceed the bursting pressure of the radiator and thus lead to damage to the hydraulic oil cooler.
  • the inlet and outlet boxes of the hydraulic oil coolers described above each have a connection.
  • the oil to be cooled is directed into the inlet box, where it flows vertically through the fins of the hydraulic oil cooler to the outlet box.
  • the oil flowing into the outlet box is supplied to the hydraulic tank via the outlet port.
  • the fins of the hydraulic oil cooler are horizontally circulated by air during operation.
  • DE 197 50 814 A1 discloses a heat exchanger, in particular oil cooler of the type with at least two separate flow channels for different media, which are broken by channels for the inflow and outflow of a medium and with corresponding connections to these channels with the channels for the other Medium and with a lid sealed to the heat exchanger, which forms a flow channel and which includes at least one control valve with which the temperature-dependent flow is regulated.
  • DE 699 21 618 T2 discloses a cooling and heating system for a machine, such as a wheel loader or wheel dump, having a main conduit arranged to contain a fluid, a first heat exchanger connected to the main conduit is and a charge air cooler for cooling compressed charge air for an internal combustion engine, which is arranged in the engine, wherein the charge air cooler is connected to the main line, wherein a second heat exchanger is connected to the main line downstream of the charge air cooler, with which second heat exchanger a line for hydraulic Liquid is connected so that heat can be transferred between the fluid in the main line and the hydraulic fluid in the hydraulic fluid line.
  • the novelty is based on the object, by flowing around the in the fins of the hydraulic oil cooler, in particular a large hydraulic excavator, located rigid hydraulic oil to heat quickly to prevent the aforementioned damage.
  • This object is achieved in that the, coming from a tank, in particular hot oil, the inlet box of the hydraulic oil cooler and is continued via connecting lines and an intermediate pressure relief valve or a check valve to the outlet box at least one hydraulic oil cooler, wherein the outlet box and the cold oil therein can be reheated and the tank can be fed.
  • the inflowing preheated oil supplied to the operating pressure via the first port into the inlet box is, when the oil in the fins of the oil cooler is still cold, passed through the inlet box past the oil cooler fins to the second port of the inlet box and further into the connection line to the outlet box ,
  • a pressure relief valve is provided in this line.
  • the pressure connection of this valve is connected via the line with the inlet box, the tank connection is connected via a further line to the outlet box of the hydraulic oil cooler.
  • the pressurized preheated oil flows through the first connection into the inlet box of the hydraulic oil cooler, pressure builds up with cold oil, which is located in the fins of the hydraulic oil cooler, because the cold oil can not immediately be forced out of the fins.
  • the preheated oil in the inlet box is now fed via the second connection to the pressure limiting valve.
  • a preset pressure in the pressure relief valve is exceeded, which is below the maximum operating pressure of the Hydraulic oil cooler is located, opens the valve and releases the flow of oil flowing from the inlet box to the outlet box.
  • the oil is further warmed up and, according to the innovation, fed to the first connection of the outlet box.
  • the oil is supplied from the outlet box to the tank via the second connection.
  • the warm oil from the hydraulic tank is thus under pressure at the connection of the inlet box of the hydraulic oil cooler.
  • hydraulic oil is further heated up by the device described above and is in the outlet box of the hydraulic cooler.
  • the radiator is warmed up to such an extent that the still clogged lamellae can be flushed free with the pressure applied.
  • the back pressure in the system decreases and the pressure relief valve closes.
  • the hydraulic oil cooler now works in the normal state.
  • FIG. 2 shows the preheating with a pressure limiting valve
  • FIG. 1 shows a schematic diagram of the prior art. Via a temperature sensor 1, which is arranged in the tank 2 and a control electronics 3, not shown, by means of a pump 4 via a control valve 5 hydraulic oil from the tank 2 into the inlet box 6 of the Hydraulic oil cooler 7 passed.
  • the hydraulic oil builds up a pressure in the slats 7 'of the hydraulic oil cooler 7 and presses the cold oil present there into the outlet box 8 of the hydraulic oil cooler 7, from where it is led via the line 9 to the tank 2.
  • FIG. 2 shows a schematic diagram of the device according to the invention for preheating cold hydraulic oil present in the lamellae 7 'of a hydraulic oil cooler 7.
  • Identical components are provided with the same reference numerals. Visible is the hydraulic oil cooler 7 with the inlet 6 and outlet box 8, a pressure relief valve 13 and the connecting lines 14,15 from the inlet box 6 to the pressure relief valve 13 and the pressure relief valve 13 to the outlet box 8 via a temperature sensor 1, which is arranged in the tank 2 and a control electronics 3, not further shown, is supplied by means of a feed pump 4 via a control valve 5 oil from the hydraulic tank 2 to the terminal 10 of the inlet box 6 of the hydraulic oil cooler 7.
  • the oil present in the inlet box 6 flows via the connection 11 of the inlet box 6 via the line 14 to the pressure limiting valve 13 and from there via the line 15 to the connection 16 of the outlet box 8 of the hydraulic oil cooler 7
  • the heated oil is supplied via the connection 17 of the outlet box 8 of the hydraulic oil cooler 7 again via the line 9 to the tank 2.
  • FIG. 3 shows a schematic diagram of the device according to the invention for preheating cold hydraulic oil present in the lamellae 7 'of a hydraulic oil cooler 7, wherein a spring-biased check valve 18 is used instead of the pressure limiting valve 13.
  • the function here corresponds to that of FIG. 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

An apparatus for preheating hydraulic oil which is located at low temperatures in at least one air-cooled hydraulic oil cooler, wherein at least one hydraulic oil cooler is arranged outside an engine compartment, in particular of a large hydraulic excavator, characterized in that the oil, in particular hot oil, coming from a tank is fed to the inlet box of the hydraulic oil cooler and is passed on via connecting lines and an interposed pressure relief valve or a non-return valve to the outlet box of at least one hydraulic oil cooler, wherein the outlet box and the cold oil located therein can be heated and fed to the tank.

Description

Hydraulische Vorwärmeinrichtung für Hydraulikölkühler in einem  Hydraulic preheater for hydraulic oil cooler in one
Großhydraulikbagger  Large hydraulic excavator
Die Neuerung betrifft eine Einrichtung zum Vorwärmen von Hydrauliköl gemäß gattungsbildendem Teil des ersten Anspruchs. The innovation relates to a device for preheating hydraulic oil according to the generic part of the first claim.
In einem Großhydraulikbagger sind die oben genannten Hydraulikölkühler normalerweise außerhalb des Motorraumes angeordnet. Aufgrund dieser Anordnung besteht beim Einsatz des Baggers in kalter Umgebungsluft das Problem, dass nach Stillstandszeiten, wie z.B. bei der Erstinbetriebnahme des Gerätes oder nach Reparatur - bzw. Wartungsarbeiten das eingesetzte Hydrauliköl bis zum Stockpunkt dickflüssig wird; was in der Folge bei außerhalb des Motorraumes angeordneten Hydraulikölkühlern zu Schäden führt und damit zu Ausfallzeiten des Großhydraulikbaggers. In a large hydraulic excavator, the above-mentioned hydraulic oil coolers are normally located outside the engine compartment. Due to this arrangement, the use of the excavator in cold ambient air has the problem that after downtime such as e.g. during initial commissioning of the device or after repair or maintenance work, the hydraulic oil used becomes thick to the point of pouring; which, as a consequence, causes damage to hydraulic oil coolers arranged outside the engine compartment and thus to downtimes of the large hydraulic excavator.
Ein luftgekühlter Hydraulikölkühler ist vielfach aufgebaut in vom Öl durchflossene Lamellen, von Luft durchströmten Lamellen und zwei Sammelkästen für das ein- und ausfließende Öl. An air-cooled hydraulic oil cooler is constructed in many ways in lamellae flowing through the oil, air-flow fins and two collecting tanks for the inflowing and outflowing oil.
Wird nun ein Großhydraulikbagger aus dem Stillstand bei niedrigen Temperaturen in Betrieb genommen, werden nach dem Starten der Motoren die Hydraulikpumpen langsam warmgefahren. Gleichzeitig wird das Öl im Hydrauliktank, in den Leitungen innerhalb des Pumpenraumes und in den Hauptkomponenten erwärmt, wobei das Öl im Hydrauliktank schnell auf Betriebstemperatur erhitzt wird. Wenn das im Hydrauliktank befindliche Öl seine Betriebstemperatur erreicht hat, steuert der im Öltank montierte Temperaturfühler den Lüfterantrieb des Hydraulikölkühlers sowie die Kühlölpumpe an. Durch die engen Lamellen im Hydraulikölkühler und den Einbau des Kühlers außerhalb des Motorraums hat das im Ölkühler befindliche Hydrauliköl noch keine oder eine noch nicht ausreichende Temperaturerhöhung erfahren. Durch die nun eingetretene Situation, dass das Öl im Hydrauliktank eine Temperatur erreicht hat, die eine Kühlung des Öls erforderlich macht, das in den Lamellen des Ölkühlers befindliche If a large hydraulic excavator is put into operation from standstill at low temperatures, the hydraulic pumps are slowly warmed up after starting the engines. At the same time, the oil in the hydraulic tank, in the pipes inside the pump chamber and in the main components is heated, whereby the oil in the hydraulic tank is heated up to operating temperature quickly. When the oil in the hydraulic tank has reached its operating temperature, the temperature sensor mounted in the oil tank activates the fan drive of the hydraulic oil cooler and the cooling oil pump. Due to the narrow fins in the hydraulic oil cooler and the installation of the radiator outside the engine compartment, the hydraulic oil located in the oil cooler has not yet experienced any or not yet sufficient increase in temperature. Due to the now occurring situation that the oil in the hydraulic tank has reached a temperature that requires cooling of the oil located in the fins of the oil cooler
BESTÄTIGUNGSKOPIE Öl aber noch kalt ist und nicht schnell genug ausgespült werden kann, kann der im System vorherrschende Staudruck den Berstdruck des Kühlers überschreiten und damit zu Schäden am Hydraulikölkühler führen. CONFIRMATION COPY Oil is still cold and can not be rinsed out fast enough, the prevailing in the system back pressure can exceed the bursting pressure of the radiator and thus lead to damage to the hydraulic oil cooler.
Die Ein- und Auslasskästen der weiter oben beschriebenen Hydraulikölkühler weisen erfahrungsgemäß jeweils einen Anschluss auf. Das zu kühlende Öl wird in den Einlasskasten geleitet, wo es von dort vertikal durch die Lamellen des Hydraulikölkühlers zum Auslasskasten strömt. Das in den Auslasskasten einfließende Öl wird über den Auslassanschluss dem Hydrauliktank zugeführt. Die Lamellen des Hydraulikölkühlers werden im Betrieb horizontal durch Luft umströmt. According to experience, the inlet and outlet boxes of the hydraulic oil coolers described above each have a connection. The oil to be cooled is directed into the inlet box, where it flows vertically through the fins of the hydraulic oil cooler to the outlet box. The oil flowing into the outlet box is supplied to the hydraulic tank via the outlet port. The fins of the hydraulic oil cooler are horizontally circulated by air during operation.
Die DE 197 50 814 A1 offenbart einen Wärmetauscher, insbesondere Ölkühler des Typs mit mindestens zwei voneinander getrennten Strömungskanälen für verschiedene Medien, die von Kanälen für den Zu- und Abfluss eines Mediums durchbrochen sind und mit entsprechenden Anschlüssen an diesen Kanälen mit den Kanälen für das andere Medium sowie mit einem zum Wärmetauscher hin abgedichteten Deckel, der einen Strömungskanal ausbildet und der mindestens ein Regelventil einschließt, mit dem die temperaturabhängige Durchströmung regelbar ist. DE 197 50 814 A1 discloses a heat exchanger, in particular oil cooler of the type with at least two separate flow channels for different media, which are broken by channels for the inflow and outflow of a medium and with corresponding connections to these channels with the channels for the other Medium and with a lid sealed to the heat exchanger, which forms a flow channel and which includes at least one control valve with which the temperature-dependent flow is regulated.
Der DE 699 21 618 T2 ist ein Kühl- und Heizsystem für eine Maschine, wie z.B. einen Radlader oder Radkipper, zu entnehmen, mit einer Hauptleitung, die so angeordnet ist, dass sie ein Fluid enthält, einem ersten Wärmetauscher, der mit der Hauptleitung verbunden ist, und einem Ladeluftkühler zum Abkühlen verdichteter Ladeluft für eine Verbrennungskraftmaschine, die in der Maschine angeordnet ist, wobei der Ladeluftkühler mit der Hauptleitung verbunden ist, wobei ein zweiter Wärmetauscher mit der Hauptleitung stromabwärts des Ladeluftkühlers verbunden ist, mit welchem zweiten Wärmetauscher eine Leitung für hydraulische Flüssigkeit verbunden ist, so dass Wärme zwischen dem Fluid in der Hauptleitung und der hydraulischen Flüssigkeit in der Leitung für hydraulische Flüssigkeit übertragen werden kann. Der Neuerung liegt die Aufgabe zugrunde, durch Umströmen das in den Lamellen des Hydraulikölkühlers, insbesondere eines Großhydraulikbaggers, befindliche starre Hydrauliköl schnell zu erwärmen, um den vorgenannten Schadensfall zu verhindern. DE 699 21 618 T2 discloses a cooling and heating system for a machine, such as a wheel loader or wheel dump, having a main conduit arranged to contain a fluid, a first heat exchanger connected to the main conduit is and a charge air cooler for cooling compressed charge air for an internal combustion engine, which is arranged in the engine, wherein the charge air cooler is connected to the main line, wherein a second heat exchanger is connected to the main line downstream of the charge air cooler, with which second heat exchanger a line for hydraulic Liquid is connected so that heat can be transferred between the fluid in the main line and the hydraulic fluid in the hydraulic fluid line. The novelty is based on the object, by flowing around the in the fins of the hydraulic oil cooler, in particular a large hydraulic excavator, located rigid hydraulic oil to heat quickly to prevent the aforementioned damage.
Diese Aufgabe wird dadurch gelöst, dass das aus einem Tank kommende, insbesondere heiße Öl, dem Einlasskasten des Hydraulikölkühlers zugeführt und über Verbindungsleitungen sowie einem zwischengeschalteten Druckbegrenzungsventil oder einem Rückschlagventil zum Auslasskasten mindestens eines Hydraulikölkühlers weitergeführt wird, wobei der Auslasskasten und das darin befindliche kalte Öl aufwärmbar und dem Tank zuführbar ist. This object is achieved in that the, coming from a tank, in particular hot oil, the inlet box of the hydraulic oil cooler and is continued via connecting lines and an intermediate pressure relief valve or a check valve to the outlet box at least one hydraulic oil cooler, wherein the outlet box and the cold oil therein can be reheated and the tank can be fed.
Vorteilhafte Weiterbildungen des Anmeldungsgegenstands sind den Unteransprüchen zu entnehmen. Advantageous developments of the subject of the application can be found in the dependent claims.
Das über den ersten Anschluss in den Einlasskasten mit dem Betriebsdruck beaufschlagte einfließende vorgewärmte Öl wird, wenn das in den Lamellen des Ölkühlers befindliche Öl noch kalt ist, durch den Einlasskasten an den Ölkühlerlamellen vorbei zum zweiten Anschluss des Einlasskastens und weiter in die Verbindungsleitung zum Auslasskasten geführt. In dieser Leitung ist ein Druckbegrenzungsventil vorgesehen. Der Druckanschluss dieses Ventils ist über die Leitung mit dem Einlasskasten verbunden, der Tankanschluss ist über eine weitere Leitung mit dem Auslasskasten des Hydraulikölkühlers verbunden. The inflowing preheated oil supplied to the operating pressure via the first port into the inlet box is, when the oil in the fins of the oil cooler is still cold, passed through the inlet box past the oil cooler fins to the second port of the inlet box and further into the connection line to the outlet box , In this line, a pressure relief valve is provided. The pressure connection of this valve is connected via the line with the inlet box, the tank connection is connected via a further line to the outlet box of the hydraulic oil cooler.
Fließt nun das unter Druck stehende vorgewärmte Öl über den ersten Anschluss in den Einlasskasten des Hydraulikölkühlers, baut sich bei kaltem Öl, das sich in den Lamellen des Hydraulikölkühlers befindet, ein Druck auf, da das kalte Öl nicht sofort aus den Lamellen herausgedrückt werden kann. Über den zweiten Anschluss des Einlasskastens wird nun das im Einlasskasten befindliche vorgewärmte Öl über den zweiten Anschluss dem Druckbegrenzungsventil zugeführt. Bei Überschreiten eines voreingestellten Drucks im Druckbegrenzungsventil, der unterhalb des maximalen Betriebsdrucks des Hydraulikölkühlers liegt, öffnet das Ventil und gibt den Durchfluss des vom Einlasskasten strömenden Öls zum Auslasskasten frei. Beim Durchströmen des Druckbegrenzungsventils wird das Öl weiter aufgewärmt und neuerungsgemäß dem ersten Anschluss des Auslasskastens zugeführt. Über den zweiten Anschluss wird das Öl aus dem Auslasskasten dem Tank zugeführt. If the pressurized preheated oil flows through the first connection into the inlet box of the hydraulic oil cooler, pressure builds up with cold oil, which is located in the fins of the hydraulic oil cooler, because the cold oil can not immediately be forced out of the fins. Via the second connection of the inlet box, the preheated oil in the inlet box is now fed via the second connection to the pressure limiting valve. When a preset pressure in the pressure relief valve is exceeded, which is below the maximum operating pressure of the Hydraulic oil cooler is located, opens the valve and releases the flow of oil flowing from the inlet box to the outlet box. When flowing through the pressure relief valve, the oil is further warmed up and, according to the innovation, fed to the first connection of the outlet box. The oil is supplied from the outlet box to the tank via the second connection.
Das warme Öl aus dem Hydrauliktank steht somit unter Druck am Anschluss des Einlasskastens des Hydraulikölkühlers an. Gleichzeitig wird durch die zuvor beschriebene Einrichtung Hydrauliköl weiter aufgeheizt und steht im Auslasskasten des Hydraulikkühlers an. Der Kühler wird dadurch soweit aufgewärmt, dass mit dem anstehenden Druck die noch verstopften Lamellen frei gespült werden können. In der Folge sinkt der Staudruck im System und das Druckbegrenzungsventil schließt. Der Hydraulikölkühler arbeitet nun im Normalzustand. The warm oil from the hydraulic tank is thus under pressure at the connection of the inlet box of the hydraulic oil cooler. At the same time, hydraulic oil is further heated up by the device described above and is in the outlet box of the hydraulic cooler. The radiator is warmed up to such an extent that the still clogged lamellae can be flushed free with the pressure applied. As a result, the back pressure in the system decreases and the pressure relief valve closes. The hydraulic oil cooler now works in the normal state.
An Stelle des Druckbegrenzungsventils kann auch ein insbesondere federvorgespanntes Rückschlagventil eingesetzt werden. In place of the pressure limiting valve and a particular spring-biased check valve can be used.
Der Neuerungsgegenstand ist anhand eines Ausführungsbeispiels in der Zeichnung dargestellt und wird wie folgt beschrieben. Es zeigen: The object of the invention is illustrated by means of an embodiment in the drawing and will be described as follows. Show it:
Figur 1 Heutige Ausführung (Stand der Technik); Figure 1 Today's version (prior art);
Figur 2 Darstellung der Vorwärmung mit einem Druckbegrenzungsventil; FIG. 2 shows the preheating with a pressure limiting valve;
Figur 3 Darstellung der Vorwärmung mit einem federvorgespannten Figure 3 representation of the preheating with a spring-biased
Rückschlagventil.  Check valve.
Figur 1 zeigt als Prinzipskizze den Stand der Technik. Über einen Temperaturfühler 1 , der im Tank 2 angeordnet ist sowie einer nicht weiter dargestellten Regelelektronik 3 wird mittels einer Förderpumpe 4 über ein Regelventil 5 Hydrauliköl aus dem Tank 2 in den Einlasskasten 6 des Hydraulikölkühlers 7 geleitet. Das Hydrauliköl baut in den Lamellen 7' des Hydraulikölkühlers 7 einen Druck auf und drückt das dort vorhandene kalte Öl in den Auslasskasten 8 des Hydraulikölkühlers 7, von wo es über die Leitung 9 zum Tank 2 geführt wird. Figure 1 shows a schematic diagram of the prior art. Via a temperature sensor 1, which is arranged in the tank 2 and a control electronics 3, not shown, by means of a pump 4 via a control valve 5 hydraulic oil from the tank 2 into the inlet box 6 of the Hydraulic oil cooler 7 passed. The hydraulic oil builds up a pressure in the slats 7 'of the hydraulic oil cooler 7 and presses the cold oil present there into the outlet box 8 of the hydraulic oil cooler 7, from where it is led via the line 9 to the tank 2.
Figur 2 zeigt als Prinzipskizze die erfindungsgemäße Einrichtung zum Vorwärmen von kaltem, in den Lamellen7' eines Hydraulikölkühlers 7 vorhandenen Hydrauliköls. Gleiche Bauteile werden mit gleichen Bezugszeichen versehen. Erkennbar ist der Hydraulikölkühler 7 mit dem Einlass- 6 und Auslasskasten 8, ein Druckbegrenzungsventil 13 sowie die Verbindungsleitungen 14,15 vom Einlasskasten 6 zum Druckbegrenzungsventil 13 und vom Druckbegrenzungsventil 13 zum Auslasskasten 8. Über einen Temperaturfühler 1 , der im Tank 2 angeordnet ist sowie eine nicht weiter dargestellte Regelelektronik 3 wird mittels einer Förderpumpe 4 über ein Regelventil 5 Öl aus dem Hydrauliktank 2 dem Anschluss 10 des Einlasskastens 6 des Hydraulikölkühlers 7 zugeführt. Bei kaltem Öl und Überschreitung des am Druckbegrenzungsventil 13 eingestellten Druckes fließt das im Einlasskasten 6 vorhandene Öl über den Anschluss 1 1 des Einlasskastens 6 über die Leitung 14 zum Druckbegrenzungsventil 13 und von dort weiter über die Leitung 15 zum Anschluss 16 des Auslasskastens 8 des Hydraulikölkühlers 7. Das erwärmte Öl wird über den Anschluss 17 des Auslasskastens 8 des Hydraulikölkühlers 7 wieder über die Leitung 9 dem Tank 2 zugeführt. FIG. 2 shows a schematic diagram of the device according to the invention for preheating cold hydraulic oil present in the lamellae 7 'of a hydraulic oil cooler 7. Identical components are provided with the same reference numerals. Visible is the hydraulic oil cooler 7 with the inlet 6 and outlet box 8, a pressure relief valve 13 and the connecting lines 14,15 from the inlet box 6 to the pressure relief valve 13 and the pressure relief valve 13 to the outlet box 8 via a temperature sensor 1, which is arranged in the tank 2 and a control electronics 3, not further shown, is supplied by means of a feed pump 4 via a control valve 5 oil from the hydraulic tank 2 to the terminal 10 of the inlet box 6 of the hydraulic oil cooler 7. When the oil is cold and the pressure set at the pressure limiting valve 13 is exceeded, the oil present in the inlet box 6 flows via the connection 11 of the inlet box 6 via the line 14 to the pressure limiting valve 13 and from there via the line 15 to the connection 16 of the outlet box 8 of the hydraulic oil cooler 7 The heated oil is supplied via the connection 17 of the outlet box 8 of the hydraulic oil cooler 7 again via the line 9 to the tank 2.
Figur 3 zeigt als Prinzipskizze die erfindungsgemäße Einrichtung zum Vorwärmen von kaltem, in den Lamellen 7' eines Hydraulikölkühlers 7 vorhandenen Hydrauliköl, wobei an Stelle des Druckbegrenzungsventils 13 hier ein federvorgespanntes Rückschlagventil 18 zum Einsatz gelangt. Die Funktion entspricht hierbei derjenigen der Figur 2. Bezugszeichenliste FIG. 3 shows a schematic diagram of the device according to the invention for preheating cold hydraulic oil present in the lamellae 7 'of a hydraulic oil cooler 7, wherein a spring-biased check valve 18 is used instead of the pressure limiting valve 13. The function here corresponds to that of FIG. 2. LIST OF REFERENCE NUMBERS
1 Temperaturfühler 1 temperature sensor
2 Tank  2 tank
3 Regelelektronik  3 control electronics
4 Förderpumpe  4 feed pump
5 Regelventil  5 control valve
6 Einlasskasten des Hydraulikölkühlers 6 Inlet box of the hydraulic oil cooler
HydraulikölkühlerHydraulic Oil Cooler
' Lamellen  'Slats
Auslasskasten des Hydraulikölkühlers Outlet box of the hydraulic oil cooler
Leitung management
10 Anschluss des Einlasskastens 10 Connection of the inlet box
1 1 Anschluss des Einlasskastens1 1 Connection of the inlet box
13 Druckbegrenzungsventil13 pressure relief valve
4 Verbindungsleitung 4 connection line
5 Verbindungsleitung 5 connection line
6 Anschluss des Auslasskastens 7 Anschluss des Auslasskastens 8 federvorgespanntes Rückschlagventil  6 Outlet box connection 7 Outlet box connection 8 Spring-loaded check valve

Claims

Einrichtung zum Vorwärmen von Hydrauliköl, das sich bei tiefen Temperaturen in mindestens einem luftgekühlten Hydraulikölkühler (7) befindet, wobei mindestens ein Hydraulikölkühler (7) außerhalb eines Motorraums, insbesondere eines Großhydraulikbaggers, angeordnet ist, dadurch gekennzeichnet, dass das aus einem Tank (2) kommende, insbesondere heiße Öl, dem Einlasskasten (6) des Hydraulikölkühlers (7) zugeführt und über Verbindungsleitungen (14,15) sowie einem zwischengeschalteten Druckbegrenzungsventil (13) oder einem Rückschlagventil (18) zum Auslasskasten (8) mindestens eines Hydraulikölkühlers (7) weitergeführt wird, wobei der Auslasskasten (8) und das darin befindliche kalte Öl aufwärmbar und dem Tank (2) zuführbar ist. Device for preheating hydraulic oil, which is located at low temperatures in at least one air-cooled hydraulic oil cooler (7), wherein at least one hydraulic oil cooler (7) is arranged outside an engine compartment, in particular a large hydraulic excavator, characterized in that it consists of a tank (2) coming, in particular hot oil, the inlet box (6) of the hydraulic oil cooler (7) and via connecting lines (14,15) and an intermediate pressure relief valve (13) or a check valve (18) to the outlet box (8) at least one hydraulic oil cooler (7) continued is, with the outlet box (8) and the cold oil therein can be reheated and the tank (2) can be fed.
Einrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass das vom Einlasskasten (6) des Hydraulikölkühlers (7) zum Druckbegrenzungsventil (13), respektive dem Rückschlagventil (18), und von dort zum Auslasskasten (8) des Hydraulikölkühlers (7) strömende Öl von einem niedrigen Temperaturniveau auf ein höheres Temperaturniveau angehoben wird, bevor es in den Auslasskasten (8) des Hydraulikölkühlers (7) gelangt. Device according to claim 1, characterized in that the from the inlet box (6) of the hydraulic oil cooler (7) to the pressure relief valve (13), respectively the check valve (18), and from there to the outlet box (8) of the hydraulic oil cooler (7) flowing oil from a low temperature level is raised to a higher temperature level before it enters the outlet box (8) of the hydraulic oil cooler (7).
Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Druckbegrenzungsventil (13) bei Erreichen eines voreingestellten Ansprechdrucks die Leitung (15) zum Auslasskasten (8) des Hydraulikölkühlers (7) öffnet, wobei der voreingestellte Ansprechdruck unterhalb des zulässigen Betriebsdrucks des Hydraulikölkühlers (7) liegt. Device according to claim 1 or 2, characterized in that the pressure limiting valve (13) opens the line (15) to the outlet box (8) of the hydraulic oil cooler (7) upon reaching a preset response pressure, the preset response pressure below the permissible operating pressure of the hydraulic oil cooler (7 ) lies.
Einrichtung nach einem der Ansprüchen 1 bis 3, dadurch gekennzeichnet, dass bei Unterschreiten des am Druckbegrenzungsventil (13,18) voreingestellten Ansprechdrucks die Leitung (15) zum Auslasskasten (8) des Hydraulikölkühlers (7) verschlossen wird. Device according to one of claims 1 to 3, characterized in that when falling below the preset pressure at the pressure limiting valve (13,18) the line (15) to the outlet box (8) of the hydraulic oil cooler (7) is closed.
5. Einrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass anstelle des Druckbegrenzungsventils (13) ein federvorgespanntes Rückschlagventil (18) einsetzbar ist. 5. Device according to one of claims 1 to 4, characterized in that instead of the pressure relief valve (13), a spring-biased check valve (18) can be used.
PCT/EP2011/003823 2010-08-04 2011-07-29 Hydraulic preheating apparatus for hydraulic oil coolers in a large hydraulic excavator WO2012016668A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2011287925A AU2011287925A1 (en) 2010-08-04 2011-07-29 Hydraulic preheating apparatus for hydraulic oil coolers in a large hydraulic excavator
EP11752463.7A EP2601390A1 (en) 2010-08-04 2011-07-29 Hydraulic preheating apparatus for hydraulic oil coolers in a large hydraulic excavator
US13/813,364 US20130213633A1 (en) 2010-08-04 2011-07-29 Hydraulic preheating apparatus for hydraulic oil coolers in a large hydraulic excavator
CN201180047919.0A CN103140654B (en) 2010-08-04 2011-07-29 For the hydraulic pressure pwc thermal of the hydraulic oil cooler in large hydraulic excavator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202010011010U DE202010011010U1 (en) 2010-08-04 2010-08-04 Hydraulic preheater for hydraulic oil cooler in a large hydraulic excavator
DE202010011010.6 2010-08-04

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WO2012016668A1 true WO2012016668A1 (en) 2012-02-09

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EP (1) EP2601390A1 (en)
CN (1) CN103140654B (en)
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WO (1) WO2012016668A1 (en)

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US10436529B1 (en) * 2018-08-23 2019-10-08 William T. Holley, Jr. Hydraulic fluid coolers
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DE202010011010U1 (en) 2010-11-04
AU2011287925A1 (en) 2013-02-28
CN103140654A (en) 2013-06-05
EP2601390A1 (en) 2013-06-12
CN103140654B (en) 2016-03-02

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