WO2018134019A1 - Ensemble moteur-pompe conçu pour un système de récupération de chaleur - Google Patents

Ensemble moteur-pompe conçu pour un système de récupération de chaleur Download PDF

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Publication number
WO2018134019A1
WO2018134019A1 PCT/EP2017/083798 EP2017083798W WO2018134019A1 WO 2018134019 A1 WO2018134019 A1 WO 2018134019A1 EP 2017083798 W EP2017083798 W EP 2017083798W WO 2018134019 A1 WO2018134019 A1 WO 2018134019A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
pump
shaft
output shaft
pump unit
Prior art date
Application number
PCT/EP2017/083798
Other languages
German (de)
English (en)
Inventor
Guido Bredenfeld
Jakob Branczeisz
Matthias RIEDLE
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018134019A1 publication Critical patent/WO2018134019A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • F04C2240/52—Bearings for assemblies with supports on both sides

Definitions

  • the present invention relates to a motor-pump unit, in particular used as a feed fluid pump of a waste heat recovery system of an internal combustion engine.
  • Fluid pumps are widely known from the prior art, for example as external gear pumps from the published patent application DE 43 09 859 A1. From EP 1 933 033 A1 a motor-pump unit is known which has a
  • Gear pump and an electric motor includes.
  • the fluid pump according to the invention has the advantage that it uses the shaft bearings of the motor driving them. Therefore she can
  • the fluid pump or the entire motor-pump unit is resistant to damage caused by poor lubrication and cavitation and can thus be used for operating temperatures close to the evaporation temperature of the working fluid to be pumped. Therefore, the engine-pump unit is particularly suitable for exhaust heat recovery systems of internal combustion engines.
  • the motor-pump unit comprises a motor and a fluid pump.
  • the fluid pump has a pump housing, wherein an inlet and an outlet are formed in the pump housing.
  • the pump housing limits a working space. In the working space is a working medium by means of a
  • the engine Conveyor from the inlet to the outlet conveyed.
  • the engine has an output shaft for transmitting torque.
  • the output shaft is supported in the engine by means of a first shaft bearing and by means of a second shaft bearing.
  • the conveyor has a drive hub. The drive hub is arranged on the output shaft.
  • the two shaft bearings can be fluidly separated relatively comparatively easily from the working space by means of sealing arrangements, so that aggressive or poorly lubricating working media can also be used.
  • the two shaft bearings can in advantageous developments even with a suitable
  • Lubricants are lubricated.
  • the drive hub by means of a movable bearing, preferably a feather key or a spline connection, arranged on the output shaft.
  • Output shaft on the conveyor thus has high efficiency in all operating conditions.
  • a shaft sealing ring arranged between the working space and the two shaft bearings separates the two shaft bearings from the working medium in a media-tight manner.
  • the working medium which often has poor lubricating properties, kept away from the wear-critical shaft bearings, which in turn can be lubricated in further developments by means of a suitable lubricant.
  • the life of the two shaft bearings is thereby increased. Furthermore, the risk of cavitation of the working medium in the shaft bearings is eliminated.
  • the fluid pump is positioned by means of a Einpasses to the engine.
  • the coaxial alignment of the output shaft to the conveyor is thereby carried out very accurately, so that the
  • Output shaft to the conveyor is aligned.
  • the sealing of the tooth chambers can thus take place in close tolerances.
  • the efficiency of the motor-pump unit is thus optimized.
  • the fitting is a press connection between the
  • the fluid pump comprises a cover flange.
  • the cover flange is positioned by means of centering pins to the pump housing.
  • the fitting is made between the cover flange and a motor housing of the engine.
  • the fit is designed as a press connection.
  • the drive hub is formed on a first gear.
  • the fluid pump is thus designed as a gear pump.
  • Gear pumps have a comparatively high efficiency with low production costs.
  • the gear pump is designed as an external gear pump or as an internal gear pump, the conveying device comprising the first gear arranged on the output shaft and a second gear meshing with the first gear. Both gears are arranged in the working space. The torque transmission from the output shaft of the motor to the first gear is thereby carried out very effectively.
  • the fluid pump according to the invention enables a fluidic separation of its two shaft bearings from the working space, so that wear and cavitation in the shaft bearings are reduced or eliminated. Therefore, the fluid pump or motor-pump unit according to the invention is very advantageous in one
  • Waste heat recovery system comprises a working medium leading circuit, wherein the circuit in the flow direction of the working medium comprises a feed fluid pump, an evaporator, an expansion machine and a condenser.
  • the feed fluid pump is designed as a motor-pump unit according to an embodiment with the features described above.
  • FIG. 1 shows a motor-pump unit of the prior art in one
  • FIG. 2 shows an inventive motor-pump unit in a
  • the motor-pump unit 80 includes a motor 90 configured as an electric motor, and a fluid pump 100 configured as one
  • Electric motor 90 is shown axially displaced.
  • the external gear pump 100 includes a pump housing 7, an end cap 7a and a lid flange 7b.
  • the end cover 7a and the cover flange 7b are clamped together with the interposition of the pump housing 7 by screws, not shown.
  • the pump housing 7, the end cover 7a and the cover flange 7b define a working space 20.
  • a first gear 9 and a second gear 19 are arranged in mesh with each other and thus constitute a conveyor 101 of the fluid pump 100.
  • the conveyor 101 conveys a working fluid from an inlet, not shown, to an outlet, not shown. Inlet and outlet are in the
  • Both gears 9, 19 have a certain number of teeth.
  • the first gear 9 is mounted on a drive shaft 8 and the second gear 19 on a parallel to the drive shaft 8 further shaft 18. Alternatively, depending one
  • Gear and one wave also be made in one piece.
  • the drive shaft 8 of the external gear pump 100 is connected to an output shaft 2 of the electric motor 90.
  • the two shafts 8, 18 each protrude through their associated gear 9,
  • the four bushings 17 each have a radial bearing function and each form a plain bearing with their associated shaft 8, 18. Die
  • Axial bearing function is achieved by the two bearing goggles 6, 16:
  • the bearing goggles 6 on the front side a stop surface 6a and the other bearing goggles 16 frontally another stop surface 16a.
  • Both stop surfaces 6a, 16a cooperate with both gears 9, 19.
  • the abutment surface 6a supports both gears 9, 19 oriented in the axial direction to the end cap 7a; the further stop surface 16a supports both gears 9, 19 oriented in the axial direction to the cover flange 7b.
  • the bearing of the two shafts 8, 18 may also be designed by means of rolling bearings.
  • seals on the pump housing 7 are arranged. Furthermore, a shaft seal 5 is arranged at the shaft drive of the drive shaft 8 between the cover flange 7b and the drive shaft 8.
  • the motor designed as an electric motor 90 comprises a motor housing 25, in which the output shaft 2 is rotatably mounted.
  • the electric motor 90 further comprises a stator 26 and a rotor 27.
  • the rotor 27 is fixedly connected to the output shaft 2 or designed in one piece with this.
  • the stator 26 is arranged stationarily in the motor housing 25.
  • the output shaft 2 and thus also the rotor 27 are by means of a first shaft bearing 1 a and a second Shaft bearing 1 b stored in the motor housing 25.
  • the two shaft bearings 1 a, 1 b are also arranged in the motor housing 25 for this purpose.
  • the two shaft bearings 1 a, 1 b are also arranged in the motor housing 25 for this purpose.
  • Shaft bearing 1 a, 1 b can be designed both as a rolling bearing and as a sliding bearing.
  • the two shaft bearings 1 a, 1 b are sealed by means of a further shaft seal 3 to the surroundings of the motor 90.
  • the further shaft sealing ring 3 is arranged on the shaft through drive of the output shaft 2 to the motor housing 25 in the radial direction between the motor housing 25 and the output shaft 2.
  • the motor-pump unit 80 further includes a clutch 4.
  • the clutch 4 is disposed between the engine 90 and the fluid pump 100 and mechanically connects the output shaft 2 to the first shaft 8 so that the drive torque generated in the motor 90 is applied to the drive shaft 8 of the fluid pump 100 is transmitted.
  • the pump housing 7 and the motor housing 25 are aligned by means of a Einpasses 1 1 to each other.
  • the fitting 1 1 comprises a formed on the motor housing 25 guide surface 1 1 a and formed on the pump housing 7 positioning 1 1 b, both of which are cylindrically shaped and form a clearance fit or a press fit in the assembled state.
  • FIG. 2 shows a motor-pump unit 80 according to the invention in one
  • the motor 90 and the fluid pump 100 in this case have a common shaft 2.
  • the output shaft 2 of the motor 90 designed as an electric motor is also the drive shaft of the fluid pump 100 designed as an external gear pump.
  • the motor-pump unit 80 includes the fluid pump 100 and the motor 90.
  • the motor 90 has the output shaft 2, which by the first
  • Shaft bearing 1 a and the second shaft bearing 1 b is mounted in the motor housing 25.
  • the output shaft 2 projects out of the motor housing 25 and enters the pump housing 7.
  • In the working space 20 of the fluid pump 100 is a
  • Drive hub 102 of the conveyor 101 mounted on the output shaft 2. Since in the embodiment of FIG. 2 the fluid pump 100 is designed as an external gear pump, the drive hub 102 is formed on the first gear 9.
  • the second gear 19 is mounted on a arranged on the pump housing 7 housing pin 7c.
  • the second gear 19 is cup-shaped.
  • other bearings of the second gear 19 would be possible, for example by means of bearing bushes, as described in the prior art.
  • the fluid pump 100 may be embodied in alternative embodiments of the external gear pump, for example, as an internal gear pump or vane pump.
  • the drive shaft of the fluid pump 100 corresponds to the output shaft 2 of the motor 90.
  • the output shaft 2 is preferably connected to the inner gear, so with the pinion.
  • the rotor is fixedly connected to the output shaft 2, while preferably the blades do not rotate.
  • the drive hub 102 and the first gear 9 is arranged axially movable as a movable bearing 13 on the output shaft 2, so that high torques can be transmitted and axial tolerances or thermal expansion can be compensated.
  • the floating bearing 13 of the output shaft 2 to the first gear 9 can be done for example by means of one or more feather keys or by means of a splined connection.
  • the axial mobility of the output shaft 2 is decoupled from the fluid pump 100. This applies to all Embodiments of the fluid pump 100, in particular for external gear pumps, for internal gear pumps and for vane pumps.
  • the output shaft is the second
  • the sealing of the tooth chambers to the pump housing 7 is made in close tolerances, so that the leakage is minimized, and the volumetric efficiency of the fluid pump 100 is increased.
  • the exact positioning is preferably carried out by the fitting 1 1 between the motor housing 25 and pump housing 7 or by centering pins 10, which align the cover flange 7b to the pump housing 7.
  • both the Einpass 1 1 and the centering pins 10 are used, both fits can be performed with or without interference fit.
  • the motor-pump unit 80 uses only a single shaft seal 5 for sealing the working space 20 to the shaft bearings 1 a, 1 b. This is arranged in the embodiment of Figure 2 in the radial direction between the output shaft 2 and the motor housing 25.
  • the shaft seal 5 may alternatively but also to the pump housing 7 and Vietnamese
  • the gears 9, 19 cooperate with a sealing washer 12, which is arranged in the pump housing 7.
  • the sealing washer 12 can be firmly connected to the pump housing 7, or be stored floating in this.
  • the sealing washer 12 is disposed between the end faces of the gears 9, 19 and the end cover 7b.
  • the sealing disc 12 serves the axial sealing of the tooth chambers and is accordingly preferably made of a tribologically favorable material.
  • the illustrated fluid pump 100 is very well suited for low-lubricating, low-viscosity working media, as they are for example in
  • Waste heat recovery systems are used for internal combustion engines.
  • the engine according to the invention is a thermoplastic body.
  • Pump unit 80 therefore in a waste heat recovery system a Internal combustion engine arranged, wherein the fluid pump 100 does not necessarily have to be designed as external gear pump.
  • Internal combustion engine is supplied oxygen via an air supply; the exhaust gas discharged after the combustion process is discharged from the engine through an exhaust pipe.
  • the waste heat recovery system comprises a circuit carrying a working medium comprising, in the flow direction of the working medium, a feed fluid pump, an evaporator, an expansion machine and a condenser.
  • the working medium can be made as needed via a spur line from a
  • Sump and a valve unit are fed into the circuit.
  • the collecting container can alternatively be integrated into the circulation.
  • the evaporator is connected to the exhaust pipe of the internal combustion engine, thus uses the heat energy of the exhaust gas of the internal combustion engine.
  • Liquid working fluid is conveyed through the feed fluid pump, possibly from the reservoir into the evaporator and there through the
  • Heat energy of the exhaust gas of the internal combustion engine evaporates.
  • the vaporized working medium is then in the expansion machine under release of mechanical energy, for example, to a generator, not shown, or to a non-illustrated transmission relaxed. Subsequently, the working medium in the condenser is liquefied again and returned to the collecting container or fed to the feed fluid pump.
  • the feed fluid pump of the waste heat recovery system is a fluid pump 100 of a motor-pump unit 80 according to one of the above
  • Waste heat recovery system as it also for bad lubricating
  • Working media with very low viscosities are suitable.
  • the risk of cavitation in the shaft bearings 1a, 1b is minimized.
  • significantly better lubricants than the working medium of the fluid pump 100 can be used for lubricating the shaft bearings 1a, 1b.
  • the wear in the shaft bearings la, lb is thereby significantly reduced.
  • the fluid pump 100 is thus also suitable for operating temperatures which are close to the evaporation temperature of the working medium and are therefore particularly suitable for use in waste heat recovery systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

L'invention concerne un ensemble moteur-pompe (80) comprenant un moteur (90) et une pompe à fluide (100). La pompe à fluide (100) comprend un corps de pompe (7), une entrée et une sortie étant ménagées dans ce corps de pompe (7). Ledit corps de pompe (7) délimite une chambre de travail (20). Un milieu actif peut être refoulé dans la chambre de travail (20), de l'entrée vers la sortie, au moyen d'un dispositif de refoulement (101). Le moteur (90) comprend un arbre de sortie (2) servant à transmettre le couple. Cet arbre de sortie (2) est monté dans le moteur (90) au moyen d'un premier palier d'arbre (1a) et au moyen d'un deuxième palier d'arbre (1b). Le dispositif de refoulement (101) comporte un moyeu d'entraînement (102). Ce moyeu d'entraînement (102) est disposé sur l'arbre de sortie (2).
PCT/EP2017/083798 2017-01-18 2017-12-20 Ensemble moteur-pompe conçu pour un système de récupération de chaleur WO2018134019A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017200708.7A DE102017200708A1 (de) 2017-01-18 2017-01-18 Motor-Pumpen-Einheit für ein Abwärmerückgewinnungssystem
DE102017200708.7 2017-01-18

Publications (1)

Publication Number Publication Date
WO2018134019A1 true WO2018134019A1 (fr) 2018-07-26

Family

ID=61148171

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/083798 WO2018134019A1 (fr) 2017-01-18 2017-12-20 Ensemble moteur-pompe conçu pour un système de récupération de chaleur

Country Status (2)

Country Link
DE (1) DE102017200708A1 (fr)
WO (1) WO2018134019A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022127805A1 (de) 2022-10-21 2024-05-02 Schaeffler Technologies AG & Co. KG Elektrischer Pumpenaktor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309859A1 (de) 1993-03-26 1994-09-29 Bosch Gmbh Robert Zahnradmaschine
US6736609B2 (en) * 2001-03-19 2004-05-18 Fukui Prefecture Support apparatus for movable member and pump apparatus
EP1933033A1 (fr) 2005-06-30 2008-06-18 Hitachi, Ltd. Pompe à engrenages intérieurs avec moteur intégré et dispositif électronique
EP2484914A2 (fr) * 2011-02-04 2012-08-08 TI Group Automotive Systems, L.L.C. Roue de pompe et pompe à fluide
DE102013205648A1 (de) 2012-12-27 2014-07-03 Robert Bosch Gmbh System zur Energierückgewinnung aus einem Abwärmestrom einer Brennkraftmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627405B4 (de) 1996-07-06 2004-10-21 Zf Friedrichshafen Ag Pumpenanordnung
US6030195A (en) 1997-07-30 2000-02-29 Delaware Capital Formation Inc. Rotary pump with hydraulic vane actuation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309859A1 (de) 1993-03-26 1994-09-29 Bosch Gmbh Robert Zahnradmaschine
US6736609B2 (en) * 2001-03-19 2004-05-18 Fukui Prefecture Support apparatus for movable member and pump apparatus
EP1933033A1 (fr) 2005-06-30 2008-06-18 Hitachi, Ltd. Pompe à engrenages intérieurs avec moteur intégré et dispositif électronique
EP2484914A2 (fr) * 2011-02-04 2012-08-08 TI Group Automotive Systems, L.L.C. Roue de pompe et pompe à fluide
DE102013205648A1 (de) 2012-12-27 2014-07-03 Robert Bosch Gmbh System zur Energierückgewinnung aus einem Abwärmestrom einer Brennkraftmaschine

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