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WO2018153605A1 - Pompe à engrenage pour un système de récupération de chaleur - Google Patents

Pompe à engrenage pour un système de récupération de chaleur Download PDF

Info

Publication number
WO2018153605A1
WO2018153605A1 PCT/EP2018/051696 EP2018051696W WO2018153605A1 WO 2018153605 A1 WO2018153605 A1 WO 2018153605A1 EP 2018051696 W EP2018051696 W EP 2018051696W WO 2018153605 A1 WO2018153605 A1 WO 2018153605A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
gear
gear pump
shaft
pump
Prior art date
Application number
PCT/EP2018/051696
Other languages
German (de)
English (en)
Inventor
Jakob Branczeisz
Frank Pohl
Tobias Korte
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 WO2018153605A1 publication Critical patent/WO2018153605A1/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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/02—Arrangements of bearings
    • 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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • 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
    • F04C2240/30—Casings or housings
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/42—Pumps with cylinders or pistons

Definitions

  • the present invention relates to a gear pump, in particular embodied as a feed fluid pump of a waste heat recovery system
  • the known gear pump comprises a housing which limits a working space. In the working space, a first gear and a second gear are meshed with each other.
  • the gear pump according to the invention separates the storage of the gear space-saving and media-tight from the working space, so that the
  • the gear pump comprises a housing, wherein in the housing a working space is formed. In the working space, a first gear and a second gear are meshed with each other.
  • the housing comprises a bearing pin.
  • the first gear is rotatably supported by means of a bearing on the bearing pin.
  • a shaft seal separates the bearing media-tight from the working space.
  • the media-tight separation of the bearing of the working fluid through the shaft seal allows separate lubrication and / or cooling of the bearing, for example with a lifetime lubrication.
  • the risk of cavitation damage in the bearing due to cavitation bubbles of the working medium is due to the media density
  • the bearing cooperates with a bearing bore formed in the first gear.
  • the bearing bore can also be designed as a continuous bore.
  • Bearing bore formed a sealing surface.
  • the shaft seal interacts with the sealing surface.
  • the sealing surface is an outer circumferential surface of the first gear. A contact force between the
  • Shaft seal and the sealing surface ensures the media-tight separation in fluidic direction to the bearing.
  • the first gear is arranged on a shaft.
  • the bearing cooperates with a bearing bore formed in the shaft. This allows gear and shaft of different
  • the individual functional surfaces, such as the bearing bore, can therefore consist of an optimal material.
  • a sealing surface is formed coaxially to the bearing bore on the shaft.
  • the shaft seal interacts with the sealing surface.
  • the sealing surface is an outer circumferential surface of the shaft. A contact force between the shaft seal and the sealing surface ensures the media-tight separation in the fluidic direction to the bearing.
  • the bearing is arranged radially surrounding. This is on the one hand a space-saving arrangement. On the other hand, thereby sealing forces and bearing forces act radially in a plane, so that no disadvantageous overturning moments can arise.
  • the bearing is designed as a rolling bearing, in particular as a needle bearing. This is a version with a small space, so that the bearing inside the shaft or inside the first gear
  • the bearing pin is arranged on a cover of the housing.
  • the housing is made of several parts, so that the gear pump is very easy to install.
  • the cover is aligned by means of centering pins to the rest of the housing, so that there is a tight tolerances of the bearing to the working space.
  • the first gear is rotatably mounted on the opposite side of the bearing by means of another bearing on a further bearing pin.
  • Another shaft seal separates the other bearing media-tight from the work space.
  • the further bearing is designed according to one of the embodiments described above.
  • the gear pump is designed as external gear pump. This is a cheap and robust design of the gear pump.
  • the second gear is mounted analogously to the first gear or with a bearing in a design as described above.
  • Gear pumps are very suitable for use in
  • gear pump 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 gear pump with the features described above.
  • the gear pump has a good seal of the bearing against the low-viscosity working media of the waste heat recovery system. Cavitation damage in the bearings is thereby prevented. Furthermore, no dirt particles of the
  • the bearings can be lubricated and cooled with a separate lubricant.
  • FIG. 1 is an exploded view of a prior art gear pump showing only the essential portions
  • Fig. 3 is a section of a portion of a gear pump according to the invention, wherein only the essential areas are shown.
  • Fig.l designed as an external gear pump gear pump 1 of the prior art is shown in an exploded view.
  • the gear pump 1 comprises a housing 2, a cover 3 and a bottom flange 4.
  • the cover 3 and the bottom flange 4 are clamped together with the interposition of the housing 2 by four screws 5.
  • the housing 2, the cover 3 and the bottom flange 4 define a working space 6.
  • a first gear 11 and a second gear 12 are arranged in mesh with each other.
  • the first gear 11 is mounted on a first shaft 21 and the second gear 12 on a first shaft 21 parallel to the second shaft 22.
  • the first shaft 21 serves as a drive shaft and is connected to a drive, not shown, for example, a crankshaft of an internal combustion engine.
  • the first shaft 21 protrudes through the bottom flange. 4
  • the two shafts 21, 22 each protrude through their associated gear 11, 12 and are firmly connected thereto. On both sides of the gears 11, 12, the shafts 21, 22 are mounted.
  • the storage is carried out by two bearing glasses 30, 40, wherein the bearing glasses 30, 40 are arranged in the working space 6: a bearing glasses 30 is disposed adjacent to the bottom flange 4 and another bearing glasses 40 adjacent to the lid 3. In both bearing glasses 30, 40 are respectively two bushings 9 pressed.
  • the bearing bushes 9 of the bearing glasses 30 support the two shafts 21, 22 on the drive side and the bearing bushes 9 of the other bearing glasses 40 on the opposite side of the gears 11, 12th
  • the four bushings 9 each have a radial bearing function.
  • Axial bearing function is achieved by the two bearing glasses 30, 40:
  • the bearing glasses 30 on the front side a stop surface 31 and the other
  • Lagerbrille 40 frontally another stop surface 42. Both stop surfaces 31, 42 cooperate with two gears 11, 12 together.
  • the stop surface 31 supports both gears 11, 12 oriented in the axial direction to the bottom flange 4; the further stop surface 42 supports both gears 11, 12 oriented in the axial direction to the lid 3.
  • seals 28 are arranged on the housing 2: A seal 28 between the housing 2 and the Cover 3, and a further seal 29 between the housing 2 and the bottom flange 4. Both seals 28, 29 extend approximately annular over the circumference of the housing 28, 29 and are usually arranged in corresponding grooves.
  • External gear pump running gear pump 1 The two gears 11, 12 are within the housing 2, ie in the working space 6, respectively.
  • the two gears 11, 12 promote the working medium along the inner wall 61 of the housing. 2
  • the second shaft 21 in the view of FIG. 2 rotates clockwise 21a and the second shaft 22 counterclockwise 22a.
  • the first teeth 13 of the first gear 11 are at their respective first tooth flanks 13a in meshing engagement with the second teeth 14 of the second gear 12 at the respective first tooth flanks 14a.
  • the first teeth heads 13b of the first teeth 13 and the second teeth heads 14b of the second teeth cooperate with the inner wall 61 of the housing 2.
  • the inlet channel 71 and the outlet channel 72 are formed in the housing 2.
  • the inlet channel 71 and the outlet channel 72 may also be otherwise configured, for example formed in the lid 3 or in the bottom flange 4.
  • the operation of the gear pump 1 is as follows:
  • One of the two gears 11, 12 is driven by the corresponding shaft 21, 22, so that meshing with each other by the tooth engagement of the corresponding teeth 13, 14, the two gears 11, 12.
  • the drive can also be otherwise, for example, electromechanical, done.
  • the first gear 11 rotates clockwise 21a and the second gear 12 counterclockwise 22a. Thereby, working fluid between the gears 11, 12 and the inner wall 61 of the housing 2 from the inlet channel 71 in the
  • Working medium from the inlet channel 71 into the outlet channel 72 also promote the function to seal the tooth chambers between the teeth 13, 14 to the inner wall 61 of the housing 2 in order to ensure the highest possible efficiency of the gear pump 1.
  • At least one shaft 21, 22 is now mounted such that the bearing is arranged in a shaft bore or gear bore and is fluidly separated from the working space 6 by means of a shaft seal.
  • 3 shows a section of a gear pump 1 in section, wherein only the essential areas are shown.
  • the gear pump 1 has the first gear 11 and the second gear 12, which are arranged in the working space 6 and mesh with each other.
  • the gear pump 1 is designed in this example as an external gear pump, but may alternatively be designed as an internal gear pump.
  • the bearing bore 50 is executed consistently, but it can alternatively be designed as a blind hole.
  • the first shaft 21 and the first gear 11 are made in one piece. Alternatively, they could also be made in two parts; the
  • Bearing bore 50 would therefore be formed in the first shaft 21.
  • a bearing pin 70 is arranged, which has a smaller diameter than the bearing bore 50, and in the
  • Bearing hole 50 protrudes.
  • the bearing 60 is arranged in the radial direction between the bearing pin 70 and the bearing bore 50.
  • the bearing 60 is a radial roller bearing.
  • the bearing 60 can also be designed as a slide bearing and continue to absorb axial forces. in the
  • the bearing pin 70 interact directly and thereby form the bearing 60.
  • the two gears 11, 12 cooperate with a stop plate 65, which in the axial direction between the lid 3 - or bottom flange 4 - and the two gears 11, 12 is positioned.
  • the starting plate 65 thus provides an axial bearing of the two gears 11, 12 there.
  • Sealing surface 51 an outer cylindrical surface, but may alternatively be internal, or even with the bearing bore 50th
  • Shaft seal 55 is arranged, the media 60 of the bearing 60 of the
  • the bearing 60 can thus be lubricated with a lubricant that does not interfere with the poorly lubricating
  • a spacer ring 57 is positioned in the axial direction, so that the shaft seal 55 is arranged axially defined.
  • Very low-viscosity working media such as those in
  • Waste heat recovery systems used have virtually no lubricating properties. Therefore, when using such, more critical
  • the gear pump 1 now separates the bearing 60 - or several bearings - from the working medium. As a result, for example, too an initial lubrication or lifetime lubrication - for example by a grease filling - or external lubrication of the bearing 60 possible.
  • Gears 11, 12, the bearing 60 is separated from the working fluid and can thereby be lubricated separately with a more suitable lubricant.
  • the center distance of the two shafts 21, 22 or gears 11, 12 arranged to one another is irrelevant for the bearings 60.
  • a minimum distance between the two shafts 21, 22 is absolutely necessary for externally arranged bearings. This also results in an advantage in terms of the required space for the gear pump 1 space.
  • the operating conditions of the bearing 60 can be made ideal, for example by external lubrication and / or cooling. This improves the hydro-dynamics within the bearing 60, and the
  • the friction in the bearing 60 is significantly reduced and improves the temperature balance within the bearing 60, resulting in a longer life of the bearing 60 result.
  • the gear pump 1 according to the invention is used in a waste heat recovery system of an internal combustion engine.
  • the internal combustion engine is supplied with 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 for the
  • Liquid working fluid is conveyed through the feed fluid pump, possibly from the reservoir into the evaporator and there through the
  • 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.
  • bearings 60 Cavitation erosion of bearings 60 reduced or completely excluded.
  • the bearings 60 can thereby be lubricated with a more suitable, separate lubricant and also cooled.

Landscapes

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

Abstract

L'invention concerne une pompe à engrenage (1), en particulier pour un système de récupération de chaleur. La pompe à engrenage (1) comprend un carter (2), une chambre de travail (6) étant réalisée dans ledit carter (2). La chambre de travail (6) renferme un premier pignon (11) et un second pignon (12) engrenant l'un avec l'autre. Le carter (2) comprend un tourillon (70). Le premier pignon (11) est monté rotatif sur le tourillon (70) au moyen d'un palier (60). Un joint d'arbre (55) sépare le palier (60) de la chambre de travail (6) de manière étanche aux fluides.
PCT/EP2018/051696 2017-02-24 2018-01-24 Pompe à engrenage pour un système de récupération de chaleur WO2018153605A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017203004.6A DE102017203004A1 (de) 2017-02-24 2017-02-24 Zahnradpumpe für ein Abwärmerückgewinnungssystem
DE102017203004.6 2017-02-24

Publications (1)

Publication Number Publication Date
WO2018153605A1 true WO2018153605A1 (fr) 2018-08-30

Family

ID=61557223

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/051696 WO2018153605A1 (fr) 2017-02-24 2018-01-24 Pompe à engrenage pour un système de récupération de chaleur

Country Status (2)

Country Link
DE (1) DE102017203004A1 (fr)
WO (1) WO2018153605A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022111757A1 (fr) * 2020-11-24 2022-06-02 Schaeffler Technologies AG & Co. KG Pompe à engrenages

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002038964A1 (fr) * 2000-11-07 2002-05-16 Ebara Corporation Pompe de moteur
JP2006207374A (ja) * 2005-01-25 2006-08-10 Ise:Kk 風力発電装置
WO2008135326A1 (fr) * 2007-05-03 2008-11-13 Oerlikon Textile Gmbh & Co. Kg Pompe à engrenage
DE102008042066A1 (de) 2008-09-12 2010-03-18 Robert Bosch Gmbh Zahnradpumpe
DE102009028449A1 (de) * 2009-08-11 2011-02-17 Robert Bosch Gmbh Zahnradpumpe
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
DE1557063C2 (de) * 1967-06-15 1974-04-25 Feinpruef Feinmess U Pruefgera Kontinuierlicher Laminarmischer fuer viscose,insbesondere hochviskose Medien
DE102008000701A1 (de) * 2008-03-17 2009-09-24 Robert Bosch Gmbh Brennstoffpumpe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002038964A1 (fr) * 2000-11-07 2002-05-16 Ebara Corporation Pompe de moteur
JP2006207374A (ja) * 2005-01-25 2006-08-10 Ise:Kk 風力発電装置
WO2008135326A1 (fr) * 2007-05-03 2008-11-13 Oerlikon Textile Gmbh & Co. Kg Pompe à engrenage
DE102008042066A1 (de) 2008-09-12 2010-03-18 Robert Bosch Gmbh Zahnradpumpe
DE102009028449A1 (de) * 2009-08-11 2011-02-17 Robert Bosch Gmbh Zahnradpumpe
DE102013205648A1 (de) 2012-12-27 2014-07-03 Robert Bosch Gmbh System zur Energierückgewinnung aus einem Abwärmestrom einer Brennkraftmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022111757A1 (fr) * 2020-11-24 2022-06-02 Schaeffler Technologies AG & Co. KG Pompe à engrenages

Also Published As

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DE102017203004A1 (de) 2018-08-30

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