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
• • 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
  • F01P7/00—Controlling of coolant flow
  • F01P7/02—Controlling of coolant flow the coolant being cooling-air
  • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
  • F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
  • F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/58—Cooling; Heating; Diminishing heat transfer
  • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
  • F04D29/5826—Cooling at least part of the working fluid in a heat exchanger
• • 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
  • F01P2025/00—Measuring
  • F01P2025/08—Temperature
  • F01P2025/36—Heat exchanger mixed fluid temperature
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
  • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

• the invention relates to a liquid-air cooling system having at least one fan device, comprising at least one variable-speed fan motor which drives a fan for generating a cooling capacity for a fluid of a cooling circuit, wherein for controlling the speed of the fan motor by means of a control and / or regulating device at least one actual value input, which originates from a machine unit which can be connected to the liquid-air cooling system via the cooling circuit, is compared with a desired value specification such that the cooling capacity of the liquid-air is dependent on the current power values of the respective machine unit Cooling system is tracked.
• EP 0 968 371 B1 shows and describes a fluid cooling device consisting of a motor which drives a fan wheel and a fluid pump which takes fluid from an oil reservoir and conveys it into a hydraulic working circuit; in the hydraulic working circuit the fluid (hydraulic medium) is heated and led to a heat exchanger, from which the fluid is cooled back into the oil tank.
• the oil tank of the fluid cooling device is trough-shaped, with in particular raised tub edges, which are suitable for forming a housing part, which accommodates the fan wheel and forms an air guide shaft for a heat exchanger of the fluid cooling device.
• DE 100 62 534 A1 describes a control system and a method for controlling the rotational speed of a multiplicity of fans for cooling a multiplicity of fluids of a work machine.
• the rotational speed of each of the plurality of fans is specifically controlled according to a single heat dissipation requirement of heat transfer cores.
• each of the plurality of fluids is monitored at its current temperature, each sensor being operable to form a signal indicative of the temperature of the respective fluid, on the one hand, and forward to an electronic control device, on the other hand Speed of each fan to control.
• the present invention seeks to provide a liquid-air cooling system, the cooling capacity of its fan device takes into account the ambient temperature of the liquid-air cooling system and an exact target temperature of the fluid is able to represent permanently. This object is achieved by a liquid-air cooling system having the features of claim 1 in its entirety.
• a liquid-air cooling system whose fan device has a fan wheel driven by a variable-speed fan motor, whereby basically a representation of a cooling capacity for a fluid of a cooling circuit is made possible, which provides an actual value specification - for example a temperature value - to be taken into account by a machine unit which can be connected to the liquid-air cooling system via the fluid circuit.
• the liquid-air cooling system also has the option of taking into account a desired value specification, wherein the desired value specification is compared with the actual value specification such that the cooling capacity of the fan device depends on the current power values of the respective machine unit supplied with fluid is tracked.
• a pertinent target / 1 st comparison and a speed control of the fan motor takes over a egelungs- and / or control device.
• the actual value specification and the desired value specification can be represented by a temperature value. It can also be provided to describe the actual value specification and the desired value specification by suitable other parameters which relate to a current operating point of the machine unit and a current actual temperature value which reflects the current operating conditions relating to the liquid-air cooling system ,
• a target value specification for example, an air temperature on a supply air side of the fan device.
• the target value specification is either a temperature of the ambient air of the hydraulic system. raulikaggregates or a temperature of the machine unit or a component of the machine unit, which is flowed through by fluid for the purpose of tempering.
• ambient air is provided as a cooling medium
• the fan motor it is advantageous to select the fan motor as a so-called variable-speed motor.
• a pertinent control and / or regulating device also in connection with the machine unit or, when using bus systems, both for the transmission of the desired value specification and the actual value specification or in the sense of a fieldbus system for To use networking of multiple machine units.
• a PID controller controls the speed of the fan motor.
• PID controllers are known to those skilled in the art and are commonly used to control the operation of mechanical drives or other mechanical equipment of machine units.
• the invention encompasses any type of PID control.
• the output variable of the PID control is limited to the maximum permissible speed of the fan motor or of the fan wheel.
• the liquid-air cooling system is compact and one, the required space minimized unit consisting of a fluid tank, a motor for driving a fluid pump, the fluid pump itself and the fan motor together with fan terrad and associated radiator and radiator housing , summarized.
• the motor for driving the fluid pump is particularly preferably directly on mounted to the fluid tank. It is expedient to select the geometrical dimensions of said components of the liquid-air cooling system such that the fan device and the motor for driving the fluid pump essentially do not protrude over a base area of the fluid tank.
• the fluid itself may be, for example, gear oil or hydraulic oil or else a water-glycol mixture.
• the liquid-air cooling system according to the invention can preferably be used to solve very exact tempering tasks on a machine tool, a gearbox, an extruder, a motor, a frequency converter or other machine unit, with a minimized expenditure of energy being a permanent one with respect to temperature fluctuations of the tempered ones Machine unit exact operation of a pertinent machine unit is made possible.
• a bed of a machine unit or a singular machine component, such as a spindle of the machine unit with fluid, in particular tempering fluid can be supplied.
• FIG. 1 shows a perspective view of a liquid-air cooling system in principle and not to scale
• the output motor power of the fan motor measured in kilowatts; and a time course of the speed of the fan motor.
• 1 is a perspective view and a partial exploded view of a liquid-air system denoted as a whole by 1
• Cooling system for supplying a schematically illustrated machine unit 9 and a component 1 1 of the machine unit 9 with fluid provided as Tempe- rierfluid 5 shown.
• Belonging to the liquid-air cooling system 1 is a fan device 2, which has a fan motor 3 formed as an electric motor 12, which drives a fan wheel 4 with individual fan blades in the manner of an axial fan.
• the fan 4 is proportionate in a Lüfterradgephinuse 22 and a protective grille 1 7 added.
• the Lüfterradgephinuse 22 may be formed of plastic or sheet metal parts.
• Fig. 2 shows in a plan view of the liquid-air cooling system in Fig. 1, for safety in the rear region of the fan wheel 4, a protective grid 18, is provided.
• a heat exchanger 19 is arranged in the form of a finned cooler.
• the heat exchanger 19 extends over the entire, swept by the fan 4 projection surface.
• the fan 4 sucks from right to left ambient air through the fins of the finned cooler and in the direction of the fan motor 3.
• the fan device 2 shown in the reverse flow direction of the cooling air can be designed and operated.
• the Lüfterradgepuruse 22 is designed in the manner of a box and mounted in the embodiment shown perpendicular to a fluid tank 13.
• the fluid tank 13 is essentially formed as a cuboid component.
• the cross-section of the fluid tank 1 3 here, as shown in Fig.
• the distributor rail 7 is arranged on the fan housing 22 .
• a sensor 28 for determining the actual temperature tact is arranged in the fluid connection of the heat exchanger 19 between the fin cooler 19 and the fluid tank 13.
• the control device 24 is located on the motor 3.
• the sensor for determining the target temperature 10 is seen in the flow direction in front of the finned cooler 19 and is protected from the direct air flow.
• the entire fan device 2 and the motor 15 for driving the fluid pump 14 only slightly surmount a base 16 of the fluid tank 1 3.
• the target temperature can be tapped additionally or alternatively by means of a corresponding sensor directly to the machine unit in operation.
• a motor control unit 24 is attached directly. This results in an integrated cable connection between the engine control unit 24 and the fan motor 3. This represents a structural measure to avoid electromagnetic interference fields during operation of the fan motor 3 and to increase the EMC compatibility of the hydraulic unit 1.
• the motor control unit 24 has in particular a frequency converter, which is individually parameterized in the embodiment shown by a connectable via a cable connector separate control unit and adapted to the particular application of the fan motor 3.
• the fluid pump 14 delivers a temperature fluid, preferably a water-glycol mixture, and is designed as a submersible pump.
• the design of the fluid pump 14 may be more or less designed with regard to a large volume flow or more with respect to a correspondingly high pressure level of the fluid 5 in a liquid-air-cooling system circuit 6 for the machine unit 9
• the type of fluid pump 14 may be, for example, a centrifugal pump or a pump with displacement elements, such as a roller pump or a vane wheel pump or a gear pump. Pump parts of the fluid pump 14 protrude to remove fluid from the fluid tank 13 in these, but are not shown in detail.
• the fluid pump 14 has a pump opening 25 for the removal of fluid 5 from the fluid tank 13. After the fluid 5 has passed through the machine unit 9 or else a component 11 of the machine unit 9, it is introduced into the lamella cooler 19 via the connection K. The heat exchanger 19 leaves the fluid 5 cooled immediately above the actual value tensor and the tubing 26 in the fluid tank 1 third
• the set in the embodiment shown differential temperature is> 5 ° Kelvin.
• a PID controller 27 in the engine control unit 24 is used for speed control of the fan motor 3.
• the distribution bar 7, the engine control unit 24 and the PID controller 27 may also be in a control and / or control block (not shown) composed.
• FIGS. 4a to 4d show protocols of relevant operating parameters during operation of the liquid-air cooling system 1 and the machine unit 9 cooled therewith.
• the supplied heat output fluctuates in this time interval between about 0.8 to 6.3 kW.
• the heat output supplied fluctuates between about 2.5 and 6.3 kW in the exemplary embodiment shown.
• FIG. 4b shows relevant temperature profiles applied to the liquid-air cooling system over the same time interval. The uppermost in Fig. 4b
• Curve shows an embodiment of the temperature profile of the temperature of the fluid 5 at the entrance of the liquid-air cooling system 1, ie after leaving the machine unit 9 and before flowing into the heat exchanger 19.
• the target value specified in the embodiment by the said temperature varies about 28 and 32 ° C.
• the fluid temperature of the fluid 5 after leaving and after a cooling process in the liquid-air cooling system 1 is shown in FIG. 4b.
• the starting temperature of the fluid 5 varies after an adjustment process in a time interval of about 250 to 600 Lake. almost not at all and sets to a temperature of about 27.8 ° C.
• FIG. 4b shows a volume flow course V of the fluid 5 in the liquid-air cooling system 1 in the same time interval.
• the volume flow V is approximately exactly 25 l / min.
• Fig. 4b is a typical course of a target value specification, here a temperature tsoii the ambient air of the liquid-air cooling system 1, wherein in the said time interval, the ambient air temperature between about 21 and 23 ° C varies.
• the inventive liquid-air cooling system 1 thus a very precise temperature control of components 1 1 of a machine unit 9, for example in the form of a machine tool spindle drive or an entire machine unit 9, such as a machining center or a machine tool allows.
• the liquid-air cooling system 1 according to the invention is thus able to bring about a significant improvement in machine precision during machining.
• Fig. 4c the curve of the motor current of the fan motor 3 and in the lower curve, the course of the liquid-air cooling system engine power of the fan motor 3 is shown in the upper curve.
• the motor current varies between about 1.2 and 2.2 amps while the motor power consumed is between about 0 and 400 watts.
• Fig. 4d the speed variation of the fan wheel 4, which is required to represent the illustrated in Fig. 4b exact outlet temperature of the fluid 5 after leaving the heat exchanger 19 can be shown.
• the speed of the fan wheel 4 fluctuates in a relatively wide range between about 200 and approximately 1000 revolutions / min. Also, the selected speed or the selected speed range documented, that the hydraulic unit 1 is quite able to ensure a low noise level during operation due to comparatively low blade tip speeds of its fan blades.

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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)
• Combustion & Propulsion (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Control Of Positive-Displacement Air Blowers (AREA)
• Motor Or Generator Cooling System (AREA)
• Cooling Or The Like Of Electrical Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=45406656

Family Applications (1)

Country Status (6)

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Citations (1)

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• 2010
  • 2010-12-30 DE DE102010056567A patent/DE102010056567A1/de not_active Ceased
• 2011
  • 2011-12-17 WO PCT/EP2011/006396 patent/WO2012089316A2/de active Application Filing
  • 2011-12-17 CN CN201180063249.1A patent/CN103328825B/zh not_active Expired - Fee Related
  • 2011-12-17 EP EP11801609.6A patent/EP2659146A2/de not_active Withdrawn
  • 2011-12-17 US US13/261,679 patent/US9267746B2/en not_active Expired - Fee Related
  • 2011-12-17 JP JP2013546610A patent/JP2014507587A/ja active Pending

Patent Citations (1)

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