EP3356675B1 - Groupe électrohydraulique compact - Google Patents

Groupe électrohydraulique compact Download PDF

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Publication number
EP3356675B1
EP3356675B1 EP16769993.3A EP16769993A EP3356675B1 EP 3356675 B1 EP3356675 B1 EP 3356675B1 EP 16769993 A EP16769993 A EP 16769993A EP 3356675 B1 EP3356675 B1 EP 3356675B1
Authority
EP
European Patent Office
Prior art keywords
tank
cover
assembly according
electric motor
compact assembly
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.)
Active
Application number
EP16769993.3A
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German (de)
English (en)
Other versions
EP3356675A1 (fr
Inventor
Andreas Guender
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP3356675A1 publication Critical patent/EP3356675A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/08—Cooling; Heating; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • 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
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding

Definitions

  • the invention relates to an electrohydraulic compact unit according to the preamble of claim 1.
  • Such units have an electric motor and a pump which delivers pressure medium from a tank to a hydrostatic consumer connected to the compact unit.
  • the unit has a high installation effort, e.g. for the piping. If a large number of the same units is required, the modular design cannot develop the advantages mentioned above. Further disadvantages are that the unit is difficult to clean because it has a very branched geometry. Noise-emitting components such as the electric motor are on the outside, which is why the unit can be noisy. In particular, the modular design results in poor space utilization and thus a large amount of installation space. These units are often installed in machine tools. Compactness is particularly important here.
  • clamping and drive module type UPE 2 with the number RE 51142, Edition: 02.11, a clamping unit in a compact design is shown.
  • the electric motor is an oil-submerged motor, which causes splashing losses and oil turbulence and thus air entrainment in the oil.
  • the sub-oil motor transmits vibrations via the hydraulic oil as structure-borne noise to the tank wall, which is why such a compact unit is noisy.
  • the EP 0 857 871 A1 discloses a compact unit with a tubular tank in which an electric motor is "practically completely” surrounded by this tank. This results in a sound insulation of the electric motor.
  • the pump is surrounded by a two-part base part.
  • the invention is based on the object of creating a compact unit in which the noise emissions of the drive unit are reduced.
  • An inexpensive standard motor is advantageously used as the electric motor, which e.g. only has a protection class IP22, since a higher protection class is achieved via the surrounding tank.
  • the inner wall of the tank is preferably at a distance from the drive unit, then there is a sound-insulating circumferential distance between the tank and the drive unit, which can be easily filled with air, for example in terms of the device.
  • the tank preferably has a cover to which the tank is attached and to which the drive unit is also attached, preferably via a damping element, for example a cork plate. Electrical lines for the electric motor preferably run through the cover.
  • the electric motor is fastened to the cover and the pump is fastened to the electric motor, so that the electric motor is fastened to the cover on its side facing away from the pump.
  • the tank is preferably made of plastic at low cost, e.g. as an injection-molded or blow-molded part.
  • the tank is thus quieter and more cost-effective than the prior art aluminum tank.
  • the tank also having an essentially circular-cylindrical smooth outer wall. This means that the tank has a circular cross-section and is easy to clean. Furthermore, with the shaping, a circulating flow of the pressure medium flowing back and its degassing can be achieved. In addition, the volume utilization of the tank can be optimized in this way.
  • the two walls can be tubular or tubular and can be clamped between the cover and a base via at least one tie rod.
  • different tank sizes can only be achieved by varying their length and the length of the tie rods and the length of the compact unit can be adapted to different lengths of electric motors.
  • the two walls can be formed in one piece with a base. This means that the tank is cup-like despite its interior.
  • the base is circular
  • the cover is circular or circular
  • the two walls, the base, the cover and a central axis of the electric motor or of the entire drive unit can be concentric to one another.
  • the outer circumference of the electric motor or of the entire drive unit is essentially circular-cylindrical, the sound-insulating distance to the inner wall of the tank can be minimized and the compact unit according to the invention can be designed as small as possible.
  • lamellae are provided in the tank through which the pressure medium is fed back; these can absorb and dissipate the heat of the pressure medium flowing back.
  • the cooling of the pressure medium is particularly effective if the lamellae are connected in a heat-conducting manner to further lamellae via pressure medium heat pipes or pressure medium heat siphons which penetrate the cover and which are arranged on an upper side of the cover facing away from the tank.
  • the other fins give off the heat directly to the surrounding air.
  • the pressure medium heat pipes or pressure medium heat siphons serve to cool the pressure medium and, for this purpose, are overflowed by the latter or are immersed in it.
  • the further lamellae are preferably cooled by at least one fan. In contrast to the last-mentioned prior art, this is driven independently of the speed of the electric motor of the drive unit.
  • the electric motor can also have cooling fins that give off the engine heat to the air that flows through the gap formed between the drive unit and the inner wall of the tank.
  • the cover can be a cooling plate or cold plate, which also absorbs and emits heat.
  • the frequency converter or its power electronics are cooled particularly effectively if he or she is attached to this heat on the top of the cooling plate facing away from the tank. This means that no control cabinet is required for the frequency converter and the wiring effort is reduced compared to the prior art.
  • the frequency converter can also have a housing with cooling fins and preferably its own fan.
  • the frequency converter and the other lamellas with their fans can be accommodated in a housing. This provides protection against dust and splash water and this can increase the protection class. Furthermore, the housing can be designed in such a way that the air from the fans is guided over the further lamellas and prevents the air from escaping to the side.
  • the central axes of the circular cylindrical tank and the electric motor preferably coincide and are aligned vertically, so that the compact unit has a vertical structure.
  • FIG. 1 shows a circuit diagram of the compact unit according to the invention according to a first embodiment.
  • the compact unit has a drive unit with an electric motor M and a hydrostatic pump 1.
  • the electric motor M is operated with a frequency converter 2.
  • the compact unit has a tank T for pressure medium, for example hydraulic oil.
  • the frequency converter 2 is provided between an electrical power supply 4 and an electrical line 6, so that the electric motor M is supplied in a frequency-controlled and thus speed-controlled manner via the electric line 6.
  • the pump 1 is thus driven at variable speed by the electric motor M via a shaft 8.
  • the pump 1 sucks in pressure medium from the tank T via a suction line 10 and conveys this via a pressure or supply line 12 to a high-pressure-side consumer connection 14 of the compact unit.
  • a consumer is connected to this consumer connection 14 via valves connected, the z. B. can be a cylinder.
  • the consumer and the valves are shown only symbolically and form a hydraulic system 16.
  • the pressure medium flows from the consumer 16 back into the compact unit via a consumer connection 18 on the low pressure side. More precisely, the pressure medium flows from the consumer connection 18 via a first return line 20 and via a second return line 21 to the tank T, a return filter 38 being provided in the first return line 20. In machine tools, two return lines 20, 21 are usually required. One that can withstand a back pressure caused by the return filter 38, and another that leads into the tank T without back pressure. A leakage connection of a rotary leadthrough on the machine tool spindle is connected here. The pressure medium that flows in the rotary feedthrough to tank T must not have any pressure medium backflow and is fed into tank T without pressure under a gradient.
  • All components arranged within an aggregate boundary 22 are located on or in the compact aggregate, all traversing lines are implemented via interfaces (plug connections for electrics, hydraulic connections for pressure line or supply line 12 to a consumer and return lines 20, 21 from the consumer).
  • the pressure p in the feed line 12 is measured by a pressure sensor 30 as close as possible to the pump, and the signal is passed on to the frequency converter 2 with an integrated PID controller for constant pressure control. This now regulates the frequency of the power supply to the electric motor M via the line 6. This ensures that, depending on the volume flow in the feed line 12, which is determined by the hydraulic system 16, the pressure in the feed line 12 is kept constant. If the hydraulic system 16 needs more volume flow, e.g. because its consumer has to be moved very quickly, the frequency converter 2 accelerates the drive unit according to the control loop (pressure sensor-frequency converter-electric motor-pump) and keeps the pressure p constant.
  • the control loop pressure sensor-frequency converter-electric motor-pump
  • a fill level sensor 24, a temperature sensor 25 for the pressure medium and a filter contamination sensor 28 for the return filter 38 are provided. These are electrically connected to an I / O board that is integrated in a housing 26 of the frequency converter 2. These signals are used, for example, for an emergency stop when the pressure medium level is too low, the temperature is too high and the return filter 38 is dirty.
  • the sensors 24, 25, 28 are evaluated analogously, or have warning functions that are triggered at defined threshold values.
  • the frequency converter 2 can output the warnings, for example, via an optical display such as an LED 34 (which lights up yellow).
  • An emergency stop signal can be indicated by the LED 34 (glowing red) and trouble-free operation by the LED 34 (glowing green).
  • the signals from the sensors 24, 25, 28 can be bundled via a data interface 36, which is analog (e.g. 4-20mA, 0-10V), digital (low-high) or a BUS interface to a higher-level interface (e.g. a controller the machine tool supplied by the compact unit).
  • a data interface 36 which is analog (e.g. 4-20mA, 0-10V), digital (low-high) or a BUS interface to a higher-level interface (e.g. a controller the machine tool supplied by the compact unit).
  • a discharge device 32 is provided on the compact unit, which can be designed as a ball valve, for example.
  • a transparent hose which serves as a level indicator 39, is installed between the tank T and the drainage device 32.
  • the drainage device 32 is held at the top of the compact unit and in particular the tank T and opened there so that the filling level in the tank T can be displayed via the hose (communicating vessels).
  • the drainage device 32 is opened and connected to the upper side of the tank T in the interior thereof, so that the entry of dirt through the ambient air is prevented.
  • an inlet and ventilation filter 43 is provided on the tank T.
  • FIG. 2 shows in a perspective longitudinal section a compact unit according to the invention according to a second embodiment.
  • the inside electric motor M with directly flanged pump 1 is shown.
  • the drive unit formed in this way is surrounded by the ring-shaped tank T, which is preferably made of plastic, for example by means of an injection molding process.
  • the suction line 10 which extends in the radial direction between the tank T and the pump 1
  • the pump 1 sucks in pressure medium from a lower area of the tank T and releases it at a higher pressure level via the supply line 12 to the following hydraulic system16 (both in Fig. 2 not shown, cf. Fig. 1 ).
  • the pressure medium After passing through the hydraulic system and releasing hydraulic energy, the pressure medium reaches a return bore and the return lines 20, 21 (both in Fig. 2 not shown, cf. Fig. 1 ) back into the tank T.
  • the drive unit is preferably installed vertically and suspended from a cover 44 with mounting screws (not shown) via a damping element 40 (e.g. a cork plate) in a vibration-damping manner. Furthermore, vibration-damping elements (not shown), such as plastic sleeves, are also provided between the mounting screws and the cover 44.
  • the lid 44 delimits the upper region of the tank T and closes it.
  • the tank T has an inner wall 46 and an outer wall 48 which are concentric to one another and between which an annular base 42 is formed in one piece.
  • the tank T is thus cup-like and has an annular cross-section with an interior.
  • the cover 44 is in the form of a circular disk and the housing 26 of the frequency converter 2 has a circular cylindrical shape.
  • the outer wall 48 of the tank T and the cover 44 and the housing 26 have approximately the same diameter, so that the compact unit overall has a circular cylindrical shape.
  • a circumferential distance 50 is provided, which is filled with ambient air. This dampens the sound emitted by the drive unit and thus the compact unit.
  • a ventilation device such as a bore or the inlet and ventilation filter 43 integrated in the cover 44, possibly in combination with a filling device (filling and ventilation filter ELF), air from the environment into the tank can be drawn from the environment in the case of a pendulum volume caused by the hydraulic system 16 T can be sucked up or released into the environment.
  • a filling device filling and ventilation filter ELF
  • the electric motor M is operated by means of the electrical line 6 (cf. Fig. 1 ) supplied with electrical energy. This is guided through a bore in the cover 44 from the frequency converter 2 arranged on the top of the cover 44 to the electric motor M on the underside of the cover 44.
  • FIG 3 shows the second embodiment of the compact unit according to the invention Figure 2 with the pump 1, the tank T, the frequency converter 2 and the housing 26 omitted. So that's the cooling of the second Embodiment of the compact unit according to the invention can be seen.
  • the tank T two lamellar stacks 144 are arranged, each consisting of a plurality of semicircular lamellae. All of the lamellae are connected in a heat-conductive manner to further lamellae packs 148 via respective pressure medium heat pipes 146 which extend through the cover 44 to the upper side of the cover 44 facing away from the tank T.
  • two further lamella sets 148 are provided, the lamellae of which are approximately quarter-circle-shaped.
  • the electric motor M is also connected in a thermally conductive manner to further plate packs 150 via four motor heat pipes (not shown) which extend through the cover 44 to the top of the cover 44 facing away from the electric motor M.
  • fans 152 e.g. two can be provided between the further lamella stacks 148, 150.
  • the cover 44 is designed as a cooling plate and penetrated by a cooling water channel, of which only the two connections 154 can be seen.
  • FIGS. 4 and 5 each show a third exemplary embodiment of the compact unit according to the invention in a sectional perspective view, the sectional planes of the two figures being rotated by 90 degrees with respect to one another.
  • the tank T is formed by an inner tube 156, an outer tube 158, the bottom 42 and the cover 44.
  • the cover 44 and the base 42 are connected to tie rods 160 with respective tie rod screws 162, the two tubes 156, 158 being clamped between the base 42 and the cover 44.
  • the cooling is also slightly changed compared to the second embodiment.
  • the frequency converter 2 is cooled with its power electronics via (for example two) its own fans 152, which suck in a volume flow of air through ventilation slots 164 of the housing 26, the Cool frequency converter 2 and its power electronics by means of flow through the interior space and through flow through its heat sink 166, and exit the housing 26 again through the ventilation slots 164.
  • the electric motor M is cooled by a fan 168 which is integrated in the interior of the compact unit or in the tank T and which is arranged concentrically to the electric motor M.
  • the fan 168 also sucks in air through the ventilation slots 164 of the housing 26, first cools the pressure medium via the further lamella sets 148 arranged on the outer circumference of the cover 44, which are connected to the lamella sets 144 of the tank T by means of pressure medium heat pipes 146, and then cools the electric motor M via its cooling fins.
  • the warm air then exits the compact unit again in the radial direction via ventilation slots 170 on an underside of the base 42.
  • the fan 168 can also be installed directly on the shaft 8.
  • a hydrostatic compact unit with an electric motor and a pump that conveys pressure medium from a tank to a consumer connection.
  • the tank is circular, and the electric motor and the pump are jointly enclosed by this tank.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Details Of Reciprocating Pumps (AREA)

Claims (12)

  1. Groupe électrohydraulique compact, comprenant une unité d'entraînement qui présente un moteur électrique (M) et une pompe hydrostatique (1), la pompe (1) permettant d'aspirer un fluide sous pression à partir d'un réservoir (T), le réservoir (T) présentant une paroi intérieure (46 ; 156) qui délimite un espace intérieur séparé du fluide sous pression et dans lequel le moteur électrique (M) et la pompe (1) sont disposés au moins en partie, caractérisé en ce que l'ensemble de l'unité d'entraînement, donc aussi l'ensemble de la pompe (1), est entouré par le réservoir (T).
  2. Groupe compact selon la revendication 1, dans lequel l'unité d'entraînement est espacée par rapport à la paroi intérieure (46 ; 156).
  3. Groupe compact selon la revendication 1 ou 2, comprenant un couvercle (44) auquel le réservoir (T) et l'unité d'entraînement sont fixés.
  4. Groupe compact selon l'une quelconque des revendications précédentes, dans lequel le réservoir (T) est fabriqué en matière synthétique.
  5. Groupe compact selon l'une quelconque des revendications précédentes, dans lequel la paroi intérieure (46 ; 156) est substantiellement cylindrique circulaire, et le réservoir (T) présente une paroi extérieure (48 ; 158) substantiellement cylindrique circulaire.
  6. Groupe compact selon les revendications 3 et 5, dans lequel les deux parois (156, 158) sont encastrées par au moins un tirant (160) entre le couvercle (44) et un fond (42), ou dans lequel les deux parois (46, 48) sont formées d'un seul tenant avec un fond (42).
  7. Groupe compact selon la revendication 6, dans lequel le fond (42) est en forme d'anneau circulaire, et le couvercle (44) est en forme d'anneau circulaire ou de disque circulaire, et les deux parois (46, 48 ; 156, 158), le fond (42), le couvercle (44) et un axe central du moteur électrique (M) ou de l'unité d'entraînement sont concentriques les uns par rapport aux autres.
  8. Groupe compact selon l'une quelconque des revendications précédentes, dans lequel, dans le réservoir, un paquet de lamelles (144) est prévu sur lequel circule le fluide sous pression.
  9. Groupe compact selon la revendication 8, dans lequel les lamelles du paquet de lamelles (144) sont reliées en conduction thermique, par l'intermédiaire de tubes de chauffe de fluide sous pression (146) qui traversent le couvercle (44), à un autre paquet de lamelles (148) qui est disposé sur un côté du couvercle (44), détourné du réservoir (T).
  10. Groupe compact selon l'une quelconque des revendications 8 à 9, dans lequel le moteur électrique (M) est relié en conduction thermique, par l'intermédiaire de tubes de chauffe de moteur qui traversent le couvercle (44), à un autre paquet de lamelles (150) qui est disposé sur un côté du couvercle (44), détourné du réservoir (T).
  11. Groupe compact selon l'une quelconque des revendications 3 à 10, dans lequel le couvercle (44) est une plaque de refroidissement.
  12. Groupe compact selon la revendication 11, dans lequel le moteur électrique (M) peut être alimenté électriquement par un convertisseur de fréquence (2) qui est fixé à la plaque de refroidissement sur un côté de celle-ci, détourné du réservoir (T).
EP16769993.3A 2015-10-02 2016-09-21 Groupe électrohydraulique compact Active EP3356675B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015219091.9A DE102015219091A1 (de) 2015-10-02 2015-10-02 Elektrohydraulisches Kompaktaggregat
PCT/EP2016/072344 WO2017055145A1 (fr) 2015-10-02 2016-09-21 Groupe électrohydraulique compact

Publications (2)

Publication Number Publication Date
EP3356675A1 EP3356675A1 (fr) 2018-08-08
EP3356675B1 true EP3356675B1 (fr) 2021-06-02

Family

ID=56979564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16769993.3A Active EP3356675B1 (fr) 2015-10-02 2016-09-21 Groupe électrohydraulique compact

Country Status (8)

Country Link
US (1) US10605236B2 (fr)
EP (1) EP3356675B1 (fr)
JP (1) JP6820326B2 (fr)
KR (1) KR20180063100A (fr)
CN (1) CN108138756B (fr)
DE (1) DE102015219091A1 (fr)
TW (1) TWI751980B (fr)
WO (1) WO2017055145A1 (fr)

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USD861733S1 (en) * 2016-04-11 2019-10-01 Robert Bosch Gmbh Hydraulic power unit
DE102016216698A1 (de) 2016-09-05 2018-03-08 Robert Bosch Gmbh Tank und elektrohydraulisches Kompaktaggregat mit einem Tank
DE102017222761A1 (de) 2017-12-14 2019-06-19 Robert Bosch Gmbh Hydraulische Versorgungseinrichtung
DE102018112835A1 (de) * 2018-05-29 2019-12-05 Fsp Fluid Systems Partner Holding Ag Hydrauliksystem, Hydraulikeinheit, Fahrzeug, Verfahren und Verwendung
WO2023014612A1 (fr) * 2021-08-05 2023-02-09 Illinois Tool Works Inc. Unité hydraulique pour essai de matériau
CN114704511B (zh) * 2022-02-21 2022-12-27 燕山大学 液压油箱及液压系统
DE102023200427B3 (de) 2023-01-20 2024-03-07 Scheuerle Fahrzeugfabrik Gmbh System und Verfahren zum Ausgleich von Hydraulikflüssigkeit sowie Schwerlast-Transportfahrzeug

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Also Published As

Publication number Publication date
JP2018530699A (ja) 2018-10-18
JP6820326B2 (ja) 2021-01-27
CN108138756B (zh) 2020-09-08
TW201725324A (zh) 2017-07-16
WO2017055145A1 (fr) 2017-04-06
TWI751980B (zh) 2022-01-11
DE102015219091A1 (de) 2017-04-06
US10605236B2 (en) 2020-03-31
EP3356675A1 (fr) 2018-08-08
KR20180063100A (ko) 2018-06-11
CN108138756A (zh) 2018-06-08
US20180274526A1 (en) 2018-09-27

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