WO2022008139A1 - Pompe pour le transport d'un fluide - Google Patents

Pompe pour le transport d'un fluide Download PDF

Info

Publication number
WO2022008139A1
WO2022008139A1 PCT/EP2021/064516 EP2021064516W WO2022008139A1 WO 2022008139 A1 WO2022008139 A1 WO 2022008139A1 EP 2021064516 W EP2021064516 W EP 2021064516W WO 2022008139 A1 WO2022008139 A1 WO 2022008139A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
bearing
housing
rotor
shaft
Prior art date
Application number
PCT/EP2021/064516
Other languages
German (de)
English (en)
Inventor
Daniel Döhler
Stephan Steinke
Original Assignee
Nidec Gpm 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 Nidec Gpm Gmbh filed Critical Nidec Gpm Gmbh
Publication of WO2022008139A1 publication Critical patent/WO2022008139A1/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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids 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
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids 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 helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04C15/0007—Radial sealings for working fluid
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • 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
    • 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
    • F04C2240/56—Bearing bushings or details thereof
    • 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
    • F04C2240/60—Shafts

Definitions

  • the invention relates to a pump for delivering a fluid according to the preamble of claim 1.
  • a generic pump device is known from EP 3 098 382 A1, which has an electric drive motor in a drive housing.
  • the electric drive motor has a rotor with a rotor shaft.
  • the rotor shaft is mounted at one end, facing away from a pump device, by means of a roller bearing.
  • the rotor shaft is slide-mounted at the other end on an opposite motor end shield and sealed off from the motor.
  • a free end of the rotor shaft protrudes into a pump housing.
  • DE 10 2017 210 770 B4 discloses a wet-running screw spindle pump designed as a fuel delivery unit.
  • the fuel pump has an electric motor that runs wet, i. H. is surrounded by the fuel to be pumped.
  • a rotor of this drive motor is single-ended, i. H. at the end facing away from the spindle pump, slide-mounted and at the other end also slide-mounted within a drive housing.
  • Such a fuel pump is a so-called wet-running pump, so that no effort is made to seal off the engine compartment, ie the interior of the drive housing, from the pump compartment. Furthermore, it is common in the prior art to guide the rotor shaft both radially and axially, for example by means of a combination bearing.
  • the aim of the invention is to further reduce the manufacturing costs for the pump for pumping a fluid, in particular by using inexpensive components.
  • the aim of the invention is to create a pump for conveying a fluid which has a higher degree of efficiency due to less friction.
  • the purpose of the invention is to specify a pump for conveying a fluid, which has a particularly short axial overall length.
  • acoustic optimization should also be achieved through lower operating noise.
  • a pump according to the invention for conveying a fluid can be designed as a screw pump and has:
  • a pump housing in which at least one pump element is mounted so that it can rotate about its pump element longitudinal axis
  • the rotor has a rotor shaft, the first shaft journal of which is coupled in a torque-transmittable manner to the at least one pump element,
  • the rotor shaft is mounted in roller bearings with a second shaft journal in the drive housing, the first shaft journal being mounted for its radial bearing by means of a sliding bearing, which is arranged in the pump housing.
  • the plain bearing of the first shaft journal is designed as a wet bearing. This contributes in particular to low-noise and low-friction operation, since fluid is present between the first shaft journal and surrounding plain bearing surfaces.
  • the rotor shaft is sealed on the drive motor side by means of a sealing ring which is seated in the drive housing.
  • a sealing ring which is seated in the drive housing.
  • an arrangement of the sealing ring that is seated in the drive housing is particularly advantageous since such a sealing ring that is seated in the drive housing provides for a rough pre-centering of the rotor shaft and thus the assembly of the pump housing on the drive housing is facilitated.
  • the pump housing is connected by means of a z. B. conical, sealing surface with a, for example, conical, sealing seat in the drive housing formed sealingly interacting. This also contributes to improved sealing of the engine compartment from the pump compartment.
  • a pre-sealing device can be mounted in front of the slide bearing on the pump side or can be formed integrally with the slide bearing on the pump side.
  • a pre-sealing device helps, for example, set the amount of fluid defined in the plain bearing if z. B. a seal with a defined leakage is used as a pre-seal. On the other hand, this results in a lower fluid load on an existing sealing ring, which sits axially next in the drive housing.
  • the pre-sealing ring can expediently be designed as a shaft sealing ring.
  • the pre-sealing ring can have a predefined minimum leakage and/or a predefined maximum leakage, which makes it easier to achieve a defined wet running of the plain bearing, i. H. a defined amount of fluid in the contact between the sliding surfaces of the rotor shaft and the plain bearing. It is expedient to place the slide bearing in a bearing bracket on the pump housing side
  • the plain bearing is formed by a bearing sleeve that sits in the pump housing.
  • the pump according to the invention is characterized in that the slide bearing is formed by the pump housing itself, ie by the material of the pump housing itself, in particular in the form of a bore or a bearing opening in the bearing arm.
  • the drive housing can be advantageous for the drive housing to have a rotor shaft passage with play for pre-positioning of the rotor shaft, in which the rotor shaft can sit with radial play and, in particular, in a mounting direction M, the pump housing has a finding funnel for easier mounting, which in the mounting direction M is the plain bearing in a Axial direction A is upstream.
  • the pump can be in the form of a centrifugal pump or, particularly preferably, in the form of a screw pump.
  • the invention is particularly suitable for the latter, since the shaft journal of the rotor shaft with sliding bearings and its end coupling to one of the screw spindles can simultaneously center the screw spindle relative to the pump housing.
  • the pump element is expediently designed as a pump impeller to form the variants mentioned above.
  • the pump element is expediently at least one screw spindle.
  • FIG. 1 a longitudinal section through a first embodiment of the pump according to the invention for conveying a fluid in a cross section;
  • FIG. 2 a detail of a second embodiment in an enlarged view (longitudinal section).
  • FIG. 1 A first embodiment of a pump 1 according to the invention is shown in FIG.
  • the pump 1 is designed as a screw pump, in which two pump elements 3 are arranged in a pump housing.
  • the pump elements 3 are designed as screw spindles in the embodiment as a screw pump, which mesh with one another in a known manner.
  • One of the pump elements 3 is connected to a rotor shaft 5 of a rotor 6 in a torque-transmittable manner at a free end of its pump element longitudinal axis 4 for the purpose of driving.
  • the rotor 6 is part of a drive motor 7 which is housed in a drive housing 8 .
  • the rotor 6 has a longitudinal axis 9 of the rotor which, in the embodiment according to FIG. 1, is aligned with the longitudinal axis 4 of the pump element of one of the pump elements 3 (driven screw spindle).
  • the rotor 6 has a first shaft journal 10 and a second shaft journal 11.
  • the first shaft journal 10 is at least radially, i. H. in a radial direction R.
  • a sealing ring 14 is seated in the drive housing 8 in the region of a rotor shaft passage 13 , which is designed, for example, as a shaft sealing ring and fluidly separates or seals a fluid-carrying pump chamber 16 from a motor chamber 17 .
  • the pump 1 according to FIG. 1 is therefore designed as a glanded pump in which the drive motor 7 runs dry, i. This means that no fluid to be pumped should get into the engine compartment 17 .
  • the second shaft journal 11 is by means of a roller bearing 18, z. B. fixed in the radial direction R and in an axial direction A with respect to the drive housing 8 by means of a single-row ball bearing.
  • the rotor 6 has a rotor body 19 which is arranged in the usual way within a stator 20 and can rotate about the longitudinal axis 9 of the rotor relative to the stator 20 .
  • the plain bearing 12 is seated in a bearing bracket 21 which is integrally connected to the pump housing 2 .
  • the sliding bearing 12 can - as in the embodiment according to Figure 1 - be designed as a bearing sleeve 12a or can only be made through a corresponding hole in the bearing carrier 21 through the material of the bearing carrier 21, i.e. in the case of a one-piece design with the pump housing 2, from the material of the pump housing 2 be formed.
  • Such an embodiment can save the installation of a plain bearing sleeve in the bearing support 21 .
  • the plain bearing 12 is a so-called wet-running plain bearing 12 since it is in contact with the fluid to be pumped, which is present in the pump chamber 16 .
  • a plain bearing 12 surrounded and wetted by pump fluid is also referred to as a wet bearing.
  • a mounting flange is provided between the pump housing 2 and the drive housing 8 , on which the pump housing 2 can be connected to the drive housing 8 .
  • Such a drive flange although it does not necessarily have to be a plane in the mathematical sense, is referred to as parting plane 22 in connection with this application.
  • a finding funnel (not shown in Figure 1) can be provided in the area of the flange, so that when the pump housing 2 and the drive housing 8 are joined in an assembly direction M, which in the present case is parallel to the axial direction A, it is easier to insert the pump housing 2 is enabled on the drive housing 8.
  • sealants such. B. an O-ring 23 may be provided.
  • the plain bearing 12 itself is not sealed and runs—as described above—in the fluid to be pumped as a wet bearing.
  • the sealing ring 14 is in a known manner as a shaft seal, z. B. in the form of a Simmerring.
  • the sealing ring 14 can be used in a state in which the pump housing 2 is not yet connected to the drive housing 8 and the first shaft journal 10 is therefore not yet being guided radially by the plain bearing 12, for pre-positioning and pre-fixing of the rotor shaft 5 of the rotor 6 in Ensure radial direction R.
  • a wet-running, sealed plain bearing 12 can be used as the plain bearing 12 .
  • Such an embodiment is shown in the enlarged detailed illustration according to FIG.
  • the embodiment of the pump 1 according to the invention according to FIG. 2 corresponds, unless otherwise shown in FIG. 2, to the embodiment according to FIG Embodiment according to FIG. 1 in a bearing sleeve 12a, which forms the sliding bearing 12.
  • the bearing sleeve 12a is z. B. formed as a one-sided sealed bearing sleeve 12a, which has sealing means 25, z. B.
  • the rotor shaft passage 13 in this regard is shown left blank in the embodiment according to FIG. However, this can be significantly reduced both in the axial direction A and in the radial direction R compared to the illustration in FIG. B. a few tenths of a millimeter in diameter larger than the outer diameter of the first shaft journal 10, the rotor shaft passage 13 can provide for a radial pre-positioning of the first shaft journal 10 before assembly of the pump 1.
  • the plain bearing 12 with the sealing on the drive motor side by the sealing means 25 is also a wet bearing educated.
  • a sealing cone surface 30 is preferably provided on the bearing support 21, which cooperates in a sealing manner with a corresponding counter-sealing surface 31 in the vicinity of the rotor shaft passage 13 on the drive housing 8 when the pump housing 2 is mounted on the drive housing 8.
  • a slide bearing 12 that is pre-sealed on the pump side.
  • a pre-sealed sliding bearing 12 can be formed by using pre-sealing devices 33 (shown in dashed lines in FIG. 2).
  • pre-sealing devices 33 can be designed similar to a shaft sealing ring in terms of design, but expediently have a defined leakage, so that a certain quantity of fluid to be pumped from the pump chamber 16 can overcome the pre-sealing device 33 and ensure that the plain bearing 12 runs wet can.
  • the sealing means 25 are provided, which seal off the leakage flow that is deliberately let through from the drive housing 8 .
  • the plain bearing 12 can only have the pre-sealing devices 33 and not the sealing means 25. With such a construction, the plain bearing 12 would also empty the leakage flow, which the pre-sealing devices 33 let through, into the drive housing 8. In such a case, it is therefore possible and expedient to use a sealing ring 14 for sealing the drive housing 8, as is shown in the embodiment according to FIG.
  • the plain bearing 12 By arranging the plain bearing 12 on the pump housing 2 or on a bearing bracket 21 according to the invention, a reduction in the number of components is possible, since by means of a suitable radially play-free coupling between the first shaft journal 10 and the pump element 3 to be driven, the plain bearing 12 can be used both for a second Radial bearing of the rotor 6 and for a motor-side radial bearing of the pump element 3 can provide.
  • a sealing ring 14 can also be saved in the drive housing 8, which has the further effect of a possible axial shortening and thus a reduction in installation space for the entire pump means.

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 une pompe pour le transport d'un fluide, comprenant: - un carter de pompe (2) dans lequel au moins un élément de pompe (3) est monté de manière à pouvoir tourner autour de son axe longitudinal d'élément de pompe (4); - un rotor (6) d'un moteur d'entraînement (7), ledit rotor étant positionné dans un carter d'entraînement (8) de manière à pouvoir tourner autour d'un axe longitudinal de rotor (9); le rotor (6) présente un arbre de rotor (5), dont le premier tourillon d'arbre (10) est accouplé à l'au moins un élément de pompe (3) de telle sorte que le couple puisse être transmis; un second tourillon d'arbre (11) de l'arbre de rotor (5) étant monté dans le carter d'entraînement (8) au moyen d'un roulement à rouleaux; et, pour le support radial du premier tourillon d'arbre, le premier tourillon d'arbre (10) est monté au moyen d'un palier lisse (12) disposé dans le carter de pompe (2).
PCT/EP2021/064516 2020-07-08 2021-05-31 Pompe pour le transport d'un fluide WO2022008139A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020118012.8A DE102020118012A1 (de) 2020-07-08 2020-07-08 Pumpe zur Förderung eines Fluids
DE102020118012.8 2020-07-08

Publications (1)

Publication Number Publication Date
WO2022008139A1 true WO2022008139A1 (fr) 2022-01-13

Family

ID=76325492

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/064516 WO2022008139A1 (fr) 2020-07-08 2021-05-31 Pompe pour le transport d'un fluide

Country Status (2)

Country Link
DE (1) DE102020118012A1 (fr)
WO (1) WO2022008139A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120128513A1 (en) * 2009-08-04 2012-05-24 Jtekt Corporation Electric pump unit
EP2916006A1 (fr) * 2014-02-21 2015-09-09 LG Innotek Co., Ltd. Pompe électrique
EP3098382A1 (fr) 2015-05-29 2016-11-30 Nidec Tosok Corporation Dispositif de pompage
US20190032656A1 (en) * 2017-07-31 2019-01-31 Nidec Tosok Corporation Electric oil pump
DE102017210770B4 (de) 2017-06-27 2019-10-17 Continental Automotive Gmbh Schraubenspindelpumpe, Kraftstoffförderaggregat und Kraftstofffördereinheit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3600884A1 (de) 1986-01-15 1987-07-16 Glyco Antriebstechnik Gmbh Hochleistungs-drehdurchfuehrung
DE102012212668A1 (de) 2012-06-29 2014-01-02 Robert Bosch Gmbh Zahnradpumpe
DE102014212616A1 (de) 2014-06-30 2015-12-31 BSH Hausgeräte GmbH Flüssigkeits- Förderpumpe für ein elektrisches Haushaltsgerät
DE102017100540B4 (de) 2017-01-12 2018-09-06 Seepex Gmbh Exzenterschneckenpumpe
DE102017218730A1 (de) 2017-10-19 2019-04-25 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120128513A1 (en) * 2009-08-04 2012-05-24 Jtekt Corporation Electric pump unit
EP2916006A1 (fr) * 2014-02-21 2015-09-09 LG Innotek Co., Ltd. Pompe électrique
EP3098382A1 (fr) 2015-05-29 2016-11-30 Nidec Tosok Corporation Dispositif de pompage
DE102017210770B4 (de) 2017-06-27 2019-10-17 Continental Automotive Gmbh Schraubenspindelpumpe, Kraftstoffförderaggregat und Kraftstofffördereinheit
US20190032656A1 (en) * 2017-07-31 2019-01-31 Nidec Tosok Corporation Electric oil pump

Also Published As

Publication number Publication date
DE102020118012A1 (de) 2022-01-13

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