EP2235375A1 - Liquid pump - Google Patents

Liquid pump

Info

Publication number
EP2235375A1
EP2235375A1 EP08863084A EP08863084A EP2235375A1 EP 2235375 A1 EP2235375 A1 EP 2235375A1 EP 08863084 A EP08863084 A EP 08863084A EP 08863084 A EP08863084 A EP 08863084A EP 2235375 A1 EP2235375 A1 EP 2235375A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pump
sealing unit
unit
liquid pump
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.)
Granted
Application number
EP08863084A
Other languages
German (de)
French (fr)
Other versions
EP2235375B1 (en
Inventor
Dirk Foerch
Martin Hochdoerffer
Harald Hermann
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
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 EP2235375A1 publication Critical patent/EP2235375A1/en
Application granted granted Critical
Publication of EP2235375B1 publication Critical patent/EP2235375B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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

Definitions

  • the invention relates to a liquid pump according to the preamble of independent claim 1.
  • liquid pumps designed as gear pumps consist of a rotatably arranged drive shaft which leads into a pump housing of the liquid pump.
  • a pump unit with at least one gear, which represents the pumping function.
  • the drive shaft is only carried out on one side of the pump housing and transmits drive energy to the at least one gearwheel.
  • This bushing must be sealed with a sealing unit designed, for example, as a radial shaft seal. If the liquid pump generates an operating pressure p B or if the liquid pump is charged with admission pressure p v , this sealing unit absorbs the resulting axial load by the sealing unit sealing the pump housing from the environment.
  • This axial load F is calculated from the sealing diameter D of the shaft and the pending pre-pressure p v according to the equation
  • DE 199 24 057 A1 shows a fluid pump with a pump housing and a pump unit arranged in the pump housing for generating an operating pressure of the fluid.
  • a pump unit arranged in the pump housing for generating an operating pressure of the fluid.
  • the liquid pump according to the invention according to the features of independent claim 1 has the advantage that an asymmetrical arrangement of the pressure fields is provided.
  • the charged by the form surfaces are thus different sizes.
  • the axial force in the fluid pump arising during the loading of the fluid pump with the admission pressure can be compensated. It creates a balance of forces on the drive shaft.
  • the storage units of the liquid pump only need to absorb radial forces, resulting in a simplification of the storage units and a resulting cost savings.
  • the fact that the sealing unit only has to absorb lower pressures, the sealing unit can be designed significantly cheaper.
  • the pressure field facing the sealing unit is preferably larger than the pressure field facing away from the sealing unit. This results in an optimal sealing of the pump housing against the
  • the area of the pressure fields can be distributed to the individual gears.
  • the pressure field facing the sealing unit is larger by a surface of the cross section of the drive shaft than the pressure field facing away from the sealing unit.
  • an enlargement of the sealing unit facing the pressure field is easy and inexpensive to achieve via a recess in a sealing surface of the liquid pump.
  • the charged by the form surfaces are thus different sizes. This creates a pressure-free surface relative to the sealing unit.
  • a symmetrical arrangement of the pressure fields related to an operating pressure of the fluid pump is provided. This results in interaction with the pressure fields of the form a balance of forces on the drive shaft.
  • the pressure-free surface is formed opposite the sealing unit.
  • a channel for connecting the recess is preferably provided with a space in the pump unit.
  • the pump unit is a gear transmission.
  • the space in the pump unit is a space between the teeth of two gears, i. around so-called interdental spaces.
  • the interdental spaces Preferably, the
  • a line for connecting the recess can be provided with a storage chamber, which also allows a simple and cost-effective implementation of a discharge.
  • FIG. 1 shows a schematic longitudinal section through a liquid pump according to the invention.
  • Fig. 2 shows a schematic cross section through the liquid pump according to the invention.
  • FIG. 1 shows a fluid pump 10 according to the invention in the form of a gear pump with a pump housing 12, which has an interior space 46 with an inlet 48 of a suction side and an outlet 50 of a pressure side.
  • a rotatably arranged drive shaft 16 which drives a pump unit 14 arranged in the interior 46 of the pump housing 12, leads into the pump housing 12 via a shaft passage to be sealed.
  • the pump unit 14 serves to convey the liquid to produce a correspondingly high pressure level of the liquid, ie, to generate an operating pressure p B.
  • the liquid is in this case pumped in the usual way from the suction side to the pressure side of the liquid pump 10.
  • the pump unit 14 preferably has a gear transmission, which generally comprises at least two gears 38, 40 according to FIG. 2, one of which is driven via the drive shaft 16. Depending on the arrangement and size of the gears, this may preferably be an external gear, a
  • the liquid pump 10 usually evenly pumps the liquid to be pumped. There is a symmetrical arrangement of the pressure fields 30, 32 of the operating pressure p B before.
  • the drive shaft 16 is rotatably mounted in the pump housing 12 via bearing units 52, 54. Between the shaft passage and the drive shaft 16, a sealing unit 18 designed as a shaft sealing ring is arranged in order to seal the pump housing 12 on the drive shaft 16 to the outside or against the environment.
  • the shaft seal 18 is arranged with a fixed seat in a recess of the pump housing 12.
  • the shaft seal 18 is formed as a radial shaft seal, which presses radially on the surface of the drive shaft 16.
  • the shaft sealing ring 18 must be suitably designed for an inlet pressure p v which can be applied to the liquid pump 10 and the operating pressure p B occurring in the pump housing 12, ie depending on the pressure level, the shaft sealing ring 18 must apply sufficiently large radial forces to fulfill its function.
  • pressure fluid in the region of the sealing unit 18 at least one of the sealing unit 18 facing pressure field 20 and at least one of the sealing unit 18 facing away pressure field 22 on the sealing unit 18th
  • an asymmetrical arrangement of the pressure fields 20, 22 is provided according to the invention.
  • the pressure field 20 facing the sealing unit 18 is greater than the pressure field 22 facing away from the sealing unit 18.
  • the pressure field 20 facing the sealing unit 18 is preferably larger around the area of the cross section 24 of the drive shaft 16 than the pressure field 22 facing away from the sealing unit 18.
  • FIG. 2 An enlargement of the pressure field 20 facing the sealing unit 18 is achieved according to FIG. 2 via a depression 26 in a sealing surface 28 of the liquid pump 10. To relieve this pressure-free surface forming recess 26 is a channel 34 for connecting the
  • Well 26 is provided with a space 36 in the pump unit 14.
  • the space 36 in the pump unit 14 is a space between the teeth of the two gears 38, 40.
  • the relief measures can also be provided individually.

Abstract

The invention relates to a liquid pump (10) comprising a pump housing (12), a pump unit (14) for generating an operating pressure (pB), a drive shaft (16) used to drive the pump unit (14) and guided out of the pump housing (12) on a drive/output side, and a sealing unit (18) sealing the passage. When the liquid pump (10) is subjected to an admission pressure (pv), the pressurised liquid generates, in the region of the sealing unit (18), at least one pressure field (20) facing the sealing unit (18) and at least one pressure field (22) facing away from the sealing unit (18). According to the invention, an asymmetrical arrangement of the pressure fields (20, 22) is provided.

Description

Beschreibung description
Titel FlüssigkeitspumpeTitle Liquid pump
Stand der TechnikState of the art
Die Erfindung betrifft eine Flüssigkeitspumpe nach dem Oberbegriff des unabhängigen Patentanspruchs 1.The invention relates to a liquid pump according to the preamble of independent claim 1.
Üblicherweise bestehen als Zahnradpumpen ausgeführte Flüssigkeitspumpen aus einer drehbar angeordneten Antriebswelle, welche in ein Pumpengehäuse der Flüssigkeitspumpe hineinführt. Im Pumpengehäuse befindet sich eine Pumpeneinheit mit mindestens einem Zahnrad, welches die Pumpfunktion darstellt. Die Antriebswelle ist nur auf einer Seite des Pumpengehäuses durchgeführt und überträgt Antriebsenergie auf das mindes- tens eine Zahnrad. Diese Durchführung muss mit einer beispielsweise als Radialwellen- dichtring ausgeführten Dichteinheit abgedichtet werden. Erzeugt die Flüssigkeitspumpe einen Betriebsdruck pB bzw. wird die Flüssigkeitspumpe mit Vordruck pv belastet, nimmt diese Dichteinheit die entstehende Axiallast auf, indem die Dichteinheit das Pumpengehäuse gegen die Umgebung abdichtet. Diese Axiallast F berechnet sich aus dem Dicht- durchmesser D der Welle und dem anstehenden Vordruck pv nach der GleichungUsually, liquid pumps designed as gear pumps consist of a rotatably arranged drive shaft which leads into a pump housing of the liquid pump. In the pump housing is a pump unit with at least one gear, which represents the pumping function. The drive shaft is only carried out on one side of the pump housing and transmits drive energy to the at least one gearwheel. This bushing must be sealed with a sealing unit designed, for example, as a radial shaft seal. If the liquid pump generates an operating pressure p B or if the liquid pump is charged with admission pressure p v , this sealing unit absorbs the resulting axial load by the sealing unit sealing the pump housing from the environment. This axial load F is calculated from the sealing diameter D of the shaft and the pending pre-pressure p v according to the equation
F=pv*D2*π/4.F = p v * D 2 * π / 4.
So zeigt die DE 199 24 057 Al eine Flüssigkeitspumpe mit einem Pumpengehäuse und einer im Pumpengehäuse angeordneten Pumpeneinheit zur Erzeugung eines Betriebs- drucks der Flüssigkeit. Zum Antreiben der Pumpeneinheit ist eine auf einer An-For example, DE 199 24 057 A1 shows a fluid pump with a pump housing and a pump unit arranged in the pump housing for generating an operating pressure of the fluid. To drive the pump unit, a
/Abtriebsseite aus dem Pumpengehäuse durchgeführte Antriebswelle vorgesehen, die ü- ber Lagereinheiten im Pumpengehäuse gelagert ist. Die Durchführung wird über eine Dichteinheit abgedichtet. Bei Belastung der Flüssigkeitspumpe erzeugt die unter Druck stehende Flüssigkeit im Bereich der Dichteinheit mindestens ein der Dichteinheit zuge- wandtes Druckfeld und mindestens ein der Dichteinheit abgewandtes Druckfeld an der Dichteinheit./ Output side provided from the pump housing carried drive shaft which is mounted ü¬ about bearing units in the pump housing. The bushing is sealed by a sealing unit. When the liquid pump is loaded, the liquid under pressure generates at least one sealing unit in the area of the sealing unit. applied pressure field and at least one of the sealing unit facing away pressure field on the sealing unit.
Offenbarung der ErfindungDisclosure of the invention
Die erfindungsgemäße Flüssigkeitspumpe nach den Merkmalen des unabhängigen Patentanspruchs 1 hat demgegenüber den Vorteil, dass eine asymmetrische Anordnung der Druckfelder vorgesehen ist. Die durch den Vordruck belasteten Flächen sind somit unterschiedlich groß. Durch eine asymmetrische Anordnung der den Vordruck betreffenden Druckfelder kann die bei der Belastung der Flüssigkeitspumpe mit dem Vordruck entstehende Axialkraft in der Flüssigkeitspumpe kompensiert werden. Es entsteht ein Kräftegleichgewicht an der Antriebswelle. Die Lagereinheiten der Flüssigkeitspumpe müssen nur noch radiale Kräfte aufnehmen, was zu einer Vereinfachung der Lagereinheiten und einer daraus resultierenden Kostenersparnis führt. Vorteilhafterweise ergibt sich eine Re- duktion der Druckbelastung an der Dichteinheit. Dadurch, dass die Dichteinheit nur noch geringere Drücke aufnehmen muss, kann die Dichteinheit deutlich kostengünstiger ausgelegt werden.The liquid pump according to the invention according to the features of independent claim 1 has the advantage that an asymmetrical arrangement of the pressure fields is provided. The charged by the form surfaces are thus different sizes. As a result of an asymmetrical arrangement of the pressure fields relating to the admission pressure, the axial force in the fluid pump arising during the loading of the fluid pump with the admission pressure can be compensated. It creates a balance of forces on the drive shaft. The storage units of the liquid pump only need to absorb radial forces, resulting in a simplification of the storage units and a resulting cost savings. Advantageously, this results in a reduction of the pressure load on the sealing unit. The fact that the sealing unit only has to absorb lower pressures, the sealing unit can be designed significantly cheaper.
Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen und Weiterbildungen sind vorteilhafte Verbesserungen der im unabhängigen Patentanspruch angegebenenThe measures and refinements recited in the dependent claims are advantageous improvements specified in the independent claim
Flüssigkeitspumpe möglich.Liquid pump possible.
Um eine asymmetrische Anordnung der Druckfelder zu erhalten, ist vorzugsweise das der Dichteinheit zugewandte Druckfeld größer als das der Dichteinheit abgewandte Druck- feld. Hierdurch ergibt sich eine optimale Abdichtung des Pumpengehäuses gegen dieIn order to obtain an asymmetrical arrangement of the pressure fields, the pressure field facing the sealing unit is preferably larger than the pressure field facing away from the sealing unit. This results in an optimal sealing of the pump housing against the
Umgebung. Weist die Pumpeneinheit mehrere Zahnräder auf, kann die Fläche der Druckfelder auf die einzelnen Zahnräder verteilt werden.Surroundings. If the pump unit has several gears, the area of the pressure fields can be distributed to the individual gears.
Besonders vorteilhaft ist das der Dichteinheit zugewandte Druckfeld um eine Fläche des Querschnitts der Antriebswelle größer als das der Dichteinheit abgewandte Druckfeld.Particularly advantageously, the pressure field facing the sealing unit is larger by a surface of the cross section of the drive shaft than the pressure field facing away from the sealing unit.
Vorteilhafterweise ist eine Vergrößerung des der Dichteinheit zugewandten Druckfeldes einfach und kostengünstig über eine Vertiefung in einer Dichtfläche der Flüssigkeitspumpe zu erreichen. Die durch den Vordruck belasteten Flächen sind somit unterschiedlich groß. Hierbei entsteht eine druckfreie Fläche gegenüber der Dichteinheit. Vorzugsweise ist eine symmetrische Anordnung der auf einen Betriebsdruck der Flüssigkeitspumpe bezogenen Druckfelder vorgesehen. Hierdurch ergibt sich im Zusammenwirken mit den Druckfeldern des Vordruckes ein Kräftegleichgewicht an der Antriebswelle.Advantageously, an enlargement of the sealing unit facing the pressure field is easy and inexpensive to achieve via a recess in a sealing surface of the liquid pump. The charged by the form surfaces are thus different sizes. This creates a pressure-free surface relative to the sealing unit. Preferably, a symmetrical arrangement of the pressure fields related to an operating pressure of the fluid pump is provided. This results in interaction with the pressure fields of the form a balance of forces on the drive shaft.
Dadurch, dass das der Dichteinheit abgewandte Druckfeld des Vordrucks kleiner als das der Antriebswelle zugewandte Druckfeld ausgelegt ist und die Druckfelder des Betriebsdrucks symmetrisch ausgelegt sind, entsteht die druckfreie Fläche gegenüber der Dichteinheit. Um diese druckfreie Fläche auf einfache und kostengünstige Weise zu entlasten, ist vorzugsweise ein Kanal zur Verbindung der Vertiefung mit einem Raum in der Pumpeneinheit vorgesehen.Because the pressure field of the pre-pressure facing away from the sealing unit is designed to be smaller than the pressure field facing the drive shaft and the pressure fields of the operating pressure are designed symmetrically, the pressure-free surface is formed opposite the sealing unit. In order to relieve this pressure-free surface in a simple and cost-effective manner, a channel for connecting the recess is preferably provided with a space in the pump unit.
Bei der Pumpeneinheit handelt es sich um ein Zahnradgetriebe. Vorteilhafterweise handelt es sich bei dem Raum in der Pumpeneinheit um einen Raum zwischen den Zähnen zweier Zahnräder, d.h. um sogenannte Zahnzwischenräume. Vorzugsweise sind dieThe pump unit is a gear transmission. Advantageously, the space in the pump unit is a space between the teeth of two gears, i. around so-called interdental spaces. Preferably, the
Zahnzwischenräume direkt nach dem Scheitelpunkt zu benutzen, wodurch durch die Ausdehnung der Zwischenräume ein Unterdruck entsteht.To use interdental spaces directly after the vertex, which creates a negative pressure by the expansion of the interstices.
Ferner kann zur Entlastung der druckfreien Fläche auch eine Leitung zur Verbindung der Vertiefung mit einer Speicherkammer vorgesehen werden, welche ebenfalls eine einfache und kostengünstige Umsetzung einer Entlastung ermöglicht.Furthermore, to relieve the pressure-free surface and a line for connecting the recess can be provided with a storage chamber, which also allows a simple and cost-effective implementation of a discharge.
Vorteilhafte Ausführungsformen der Erfindung sind in den Zeichnungen dargestellt und werden nachfolgend beschrieben. In den Zeichnungen bezeichnen gleiche Bezugszeichen Komponenten bzw. Elemente, die gleiche bzw. analoge Funktionen ausführen.Advantageous embodiments of the invention are illustrated in the drawings and will be described below. In the drawings, like reference numerals designate components that perform the same or analog functions.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Fig. 1 zeigt einen schematischen Längsschnitt durch eine erfindungsgemäße Flüssigkeits- pumpe.1 shows a schematic longitudinal section through a liquid pump according to the invention.
Fig. 2 zeigt einen schematischen Querschnitt durch die erfindungsgemäße Flüssigkeitspumpe.Fig. 2 shows a schematic cross section through the liquid pump according to the invention.
Ausführungsformen der Erfindung - A -Embodiments of the invention - A -
Fig. 1 zeigt eine erfindungsgemäße Flüssigkeitspumpe 10 in Form einer Zahnradpumpe mit einem Pumpengehäuse 12, das einen Innenraum 46 mit einem Zulauf 48 einer Saugseite und einem Ablauf 50 einer Druckseite aufweist. In das Pumpengehäuse 12 führt ü- ber einen abzudichtenden Wellendurchgang eine drehbar angeordnete Antriebswelle 16, welche eine im Innenraum 46 des Pumpengehäuses 12 angeordnete Pumpeneinheit 14 antreibt.1 shows a fluid pump 10 according to the invention in the form of a gear pump with a pump housing 12, which has an interior space 46 with an inlet 48 of a suction side and an outlet 50 of a pressure side. A rotatably arranged drive shaft 16, which drives a pump unit 14 arranged in the interior 46 of the pump housing 12, leads into the pump housing 12 via a shaft passage to be sealed.
Die Pumpeneinheit 14 dient zur Förderung der Flüssigkeit unter Erzeugung eines ent- sprechend hohen Druckniveaus der Flüssigkeit, d.h. unter Erzeugung eines Betriebsdruckes pB. Die Flüssigkeit wird hierbei in üblicher Weise von der Saugseite zur Druckseite der Flüssigkeitspumpe 10 gepumpt. Hierzu weist die Pumpeneinheit 14 vorzugsweise ein Zahnradgetriebe auf, welches in der Regel mindestens zwei Zahnräder 38, 40 gemäß Fig. 2 umfasst, wovon eines über die Antriebswelle 16 angetrieben wird. Je nach Anordnung und Größe der Zahnräder kann es sich hierbei vorzugsweise um eine Außenzahnrad-, eineThe pump unit 14 serves to convey the liquid to produce a correspondingly high pressure level of the liquid, ie, to generate an operating pressure p B. The liquid is in this case pumped in the usual way from the suction side to the pressure side of the liquid pump 10. For this purpose, the pump unit 14 preferably has a gear transmission, which generally comprises at least two gears 38, 40 according to FIG. 2, one of which is driven via the drive shaft 16. Depending on the arrangement and size of the gears, this may preferably be an external gear, a
Innenzahnrad-, eine Zahnring- oder eine Schraubpumpe handeln. Die Flüssigkeitspumpe 10 fördert in der Regel gleichmäßig die zu pumpende Flüssigkeit. Es liegt eine symmetrische Anordnung der Druckfelder 30, 32 des Betriebsdruckes pB vor.Act on internal gear, a gerotor or a screw pump. The liquid pump 10 usually evenly pumps the liquid to be pumped. There is a symmetrical arrangement of the pressure fields 30, 32 of the operating pressure p B before.
Die Antriebswelle 16 ist über Lagereinheiten 52, 54 drehbar im Pumpengehäuse 12 gelagert. Zwischen dem Wellendurchgang und der Antriebswelle 16 ist eine als Wellendicht- ring ausgebildete Dichteinheit 18 angeordnet, um das Pumpengehäuse 12 an der Antriebswelle 16 nach außen bzw. gegen die Umgebung abzudichten. Der Wellendichtring 18 ist mit festem Sitz in einer Ausnehmung des Pumpengehäuses 12 angeordnet. Vor- zugsweise ist der Wellendichtring 18 als Radialwellendichtring ausgebildet, der radial auf die Oberfläche der Antriebswelle 16 drückt. Der Wellendichtring 18 muss einem an die Flüssigkeitspumpe 10 anlegbaren Vordruck pv und dem im Pumpengehäuse 12 auftretenden Betriebsdruck pB entsprechend ausgelegt sein, d.h. der Wellendichtring 18 muss je nach Druckniveau zur Erfüllung seiner Funktion ausreichend große Radialkräfte aufbrin- gen. Bei Belastung der Flüssigkeitspumpe 10 mit dem Vordruck pv erzeugt die unterThe drive shaft 16 is rotatably mounted in the pump housing 12 via bearing units 52, 54. Between the shaft passage and the drive shaft 16, a sealing unit 18 designed as a shaft sealing ring is arranged in order to seal the pump housing 12 on the drive shaft 16 to the outside or against the environment. The shaft seal 18 is arranged with a fixed seat in a recess of the pump housing 12. Preferably, the shaft seal 18 is formed as a radial shaft seal, which presses radially on the surface of the drive shaft 16. The shaft sealing ring 18 must be suitably designed for an inlet pressure p v which can be applied to the liquid pump 10 and the operating pressure p B occurring in the pump housing 12, ie depending on the pressure level, the shaft sealing ring 18 must apply sufficiently large radial forces to fulfill its function. When the liquid pump 10 is loaded with the form p v produces the under
Druck stehende Flüssigkeit im Bereich der Dichteinheit 18 mindestens ein der Dichteinheit 18 zugewandtes Druckfeld 20 und mindestens ein der Dichteinheit 18 abgewandtes Druckfeld 22 an der Dichteinheit 18. Um die durch den Vordruck pv verursachte axiale Kraft F direkt in der Flüssigkeitspumpe 10 zu kompensieren, ist erfindungsgemäß eine asymmetrische Anordnung der Druckfelder 20, 22 vorgesehen. Im vorliegenden Ausführungsbeispiel ist das der Dichteinheit 18 zugewandte Druckfeld 20 größer als das der Dichteinheit 18 abgewandte Druckfeld 22. Vorzugsweise ist das der Dichteinheit 18 zugewandte Druckfeld 20 um eine Fläche des Querschnitts 24 der Antriebswelle 16 größer als das der Dichteinheit 18 abgewandte Druckfeld 22 .Pressure fluid in the region of the sealing unit 18 at least one of the sealing unit 18 facing pressure field 20 and at least one of the sealing unit 18 facing away pressure field 22 on the sealing unit 18th In order to compensate for the axial force F caused by the form p v directly in the liquid pump 10, an asymmetrical arrangement of the pressure fields 20, 22 is provided according to the invention. In the present exemplary embodiment, the pressure field 20 facing the sealing unit 18 is greater than the pressure field 22 facing away from the sealing unit 18. The pressure field 20 facing the sealing unit 18 is preferably larger around the area of the cross section 24 of the drive shaft 16 than the pressure field 22 facing away from the sealing unit 18.
Eine Vergrößerung des der Dichteinheit 18 zugewandten Druckfeldes 20 wird gemäß Fig. 2 ü- ber eine Vertiefung 26 in einer Dichtfläche 28 der Flüssigkeitspumpe 10 erreicht. Zur Entlas- tung dieser eine druckfreie Fläche bildenden Vertiefung 26 ist ein Kanal 34 zur Verbindung derAn enlargement of the pressure field 20 facing the sealing unit 18 is achieved according to FIG. 2 via a depression 26 in a sealing surface 28 of the liquid pump 10. To relieve this pressure-free surface forming recess 26 is a channel 34 for connecting the
Vertiefung 26 mit einem Raum 36 in der Pumpeneinheit 14 vorgesehen. Vorzugsweise handelt es sich bei dem Raum 36 in der Pumpeneinheit 14 um einen Raum zwischen den Zähnen der beiden Zahnräder 38, 40. Ferner ist zusätzlich zur Entlastung der als Vertiefung ausgebildeten druckfreien Fläche 26 eine Leitung 42 zur Verbindung der Vertiefung mit einer Speicherkam- mer 44 vorgesehen. Selbstverständlich können die Maßnahmen zur Entlastung auch einzeln vorgesehen sein.Well 26 is provided with a space 36 in the pump unit 14. Preferably, the space 36 in the pump unit 14 is a space between the teeth of the two gears 38, 40. Further, in addition to relieving the pressure-free surface 26 formed as a recess, a conduit 42 for connecting the recess to a storage chamber 44 intended. Of course, the relief measures can also be provided individually.
.o0o. .o0o.

Claims

Ansprüche claims
1. Flüssigkeitspumpe (10) mit einem Pumpengehäuse (12), einer Pumpeneinheit (14) zur Erzeugung eines Betriebsdrucks (pB), einer auf einer An-/ Abtriebsseite aus dem Pumpenge- häuse (12) durchführten Antriebswelle (16) zum Antreiben der Pumpeneinheit (14), und einer die Durchführung abdichtenden Dichteinheit (18), wobei bei Belastung der Flüssigkeitspumpe (10) mit einem Vordruck (pv) die unter Druck stehende Flüssigkeit im Bereich der Dichteinheit (18) mindestens ein der Dichteinheit (18) zugewandtes Druckfeld (20) und mindestens ein der Dichteinheit (18) abgewandtes Druckfeld (22) an der Dichteinheit (18) erzeugt, gekennzeichnet durch eine asymmetrische Anordnung der Druckfelder (20,1. A liquid pump (10) with a pump housing (12), a pump unit (14) for generating an operating pressure (p B ), on a drive / driven side from the pump housing (12) passed drive shaft (16) for driving the Pump unit (14), and a sealing unit sealing the passage (18), wherein upon loading of the liquid pump (10) with a pre-pressure (p v ), the pressurized liquid in the region of the sealing unit (18) facing at least one of the sealing unit (18) Pressure field (20) and at least one of the sealing unit (18) facing away pressure field (22) on the sealing unit (18) generated, characterized by an asymmetrical arrangement of the pressure fields (20,
22).22).
2. Flüssigkeitspumpe nach Anspruch 1, dadurch gekennzeichnet, dass das der Dichteinheit (18) zugewandte Druckfeld (20) größer als das der Dichteinheit (18) abgewandte Druck- feld (22) ist.2. Liquid pump according to claim 1, characterized in that the sealing unit (18) facing the pressure field (20) is greater than the sealing unit (18) facing away pressure field (22).
3. Flüssigkeitspumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das der Dichteinheit (18) zugewandte Druckfeld (20) um eine Fläche des Querschnitts (24) der Antriebswelle (16) größer als das der Dichteinheit (18) abgewandte Druckfeld (22) ist.3. Liquid pump according to claim 1 or 2, characterized in that the sealing unit (18) facing pressure field (20) about a surface of the cross section (24) of the drive shaft (16) greater than the sealing unit (18) facing away pressure field (22). is.
4. Flüssigkeitspumpe nach einem der Ansprüche 1 bis 3, gekennzeichnet durch eine Vertiefung (26) in einer Dichtfläche (28).4. Liquid pump according to one of claims 1 to 3, characterized by a recess (26) in a sealing surface (28).
5. Flüssigkeitspumpe nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine symmetrische Anordnung der Druckfelder (30, 32) des Betriebsdruckes (pB).5. Liquid pump according to one of the preceding claims, characterized by a symmetrical arrangement of the pressure fields (30, 32) of the operating pressure (p B ).
6. Flüssigkeitspumpe nach einem der vorhergehenden Ansprüche, gekennzeichnet durch einen Kanal (34) zur Verbindung der Vertiefung (26) mit einem Raum (36) in der Pumpeneinheit (14).6. Liquid pump according to one of the preceding claims, characterized by a channel (34) for connecting the recess (26) with a space (36) in the pump unit (14).
7. Flüssigkeitspumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es sich bei der Pumpeneinheit (14) um ein Zahnradgetriebe handelt. 7. Liquid pump according to one of the preceding claims, characterized in that it is a gear transmission in the pump unit (14).
8. Flüssigkeitspumpe nach Anspruch 1, dadurch gekennzeichnet, dass es sich bei dem Raum (36) in der Pumpeneinheit (14) um einen Raum zwischen den Zähnen zweier Zahnräder (38, 40) handelt.8. A liquid pump according to claim 1, characterized in that it is in the space (36) in the pump unit (14) to a space between the teeth of two gears (38, 40).
9. Flüssigkeitspumpe nach Anspruch 1, gekennzeichnet durch eine Leitung (42) zur Verbindung der Vertiefung (26) mit einer Speicherkammer (44).9. Liquid pump according to claim 1, characterized by a line (42) for connecting the recess (26) with a storage chamber (44).
.oOo. .oOo.
EP08863084.3A 2007-12-17 2008-10-23 Liquid pump Not-in-force EP2235375B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007060758A DE102007060758A1 (en) 2007-12-17 2007-12-17 liquid pump
PCT/EP2008/064384 WO2009077248A1 (en) 2007-12-17 2008-10-23 Liquid pump

Publications (2)

Publication Number Publication Date
EP2235375A1 true EP2235375A1 (en) 2010-10-06
EP2235375B1 EP2235375B1 (en) 2013-12-11

Family

ID=40525085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08863084.3A Not-in-force EP2235375B1 (en) 2007-12-17 2008-10-23 Liquid pump

Country Status (6)

Country Link
US (1) US20100316520A1 (en)
EP (1) EP2235375B1 (en)
JP (1) JP5583025B2 (en)
CN (1) CN101896723B (en)
DE (1) DE102007060758A1 (en)
WO (1) WO2009077248A1 (en)

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Also Published As

Publication number Publication date
JP2011506837A (en) 2011-03-03
EP2235375B1 (en) 2013-12-11
JP5583025B2 (en) 2014-09-03
WO2009077248A1 (en) 2009-06-25
CN101896723A (en) 2010-11-24
DE102007060758A1 (en) 2009-06-18
US20100316520A1 (en) 2010-12-16
CN101896723B (en) 2013-05-01

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