EP1292769B1 - Pump - Google Patents

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Publication number
EP1292769B1
EP1292769B1 EP01940549A EP01940549A EP1292769B1 EP 1292769 B1 EP1292769 B1 EP 1292769B1 EP 01940549 A EP01940549 A EP 01940549A EP 01940549 A EP01940549 A EP 01940549A EP 1292769 B1 EP1292769 B1 EP 1292769B1
Authority
EP
European Patent Office
Prior art keywords
pressure plate
pump
housing cover
pocket
pump chamber
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.)
Expired - Lifetime
Application number
EP01940549A
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German (de)
French (fr)
Other versions
EP1292769A1 (en
Inventor
Wolfgang Reuter
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.)
ixetic Bad Homburg GmbH
Original Assignee
ixetic Bad Homburg GmbH
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Publication date
Application filed by ixetic Bad Homburg GmbH filed Critical ixetic Bad Homburg GmbH
Publication of EP1292769A1 publication Critical patent/EP1292769A1/en
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Publication of EP1292769B1 publication Critical patent/EP1292769B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
    • 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
    • F04C15/0023—Axial sealings for working fluid
    • 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
    • F04C2/086—Carter

Definitions

  • the invention relates to a pump having a housing which has a recess in which a pump unit is arranged, which has a pump chamber formed by a pump chamber ring and at least one located on the pump chamber ring pressure plate and a rotatably driven pump element which is arranged in the pump chamber, a the recess closing, fixed to the housing housing cover and with a limited by the recess and the pressure plate pressure chamber.
  • Pumps of the type discussed here are known. They have a housing in which a recess is formed. In this recess, a pump unit is used. This pump unit has a pump chamber which is formed by a pump chamber ring and at least one pressure plate lying on the pump chamber ring. It can also be provided two printing plates. The pump unit further comprises a rotatably drivable pump element disposed in the pump chamber. The recess in the housing is closed by a housing cover. In a known pump (US 2765745) is one of the printing plates integral with formed on the housing cover and is urged by the housing cover to the pump chamber ring. In addition, the pump has a pressure chamber which is delimited by the other pressure plate and the recess or directly by the wall of the recess.
  • the medium conveyed by the rotationally driven pump element is located in the pressure chamber under pressure. This presses on the pressure plate, which in turn transmits this force to the pump chamber ring, which thus acts on the other pressure plate radially outward with an axially acting force which deforms this pressure plate and the housing cover.
  • the pressure within the pump element acts in such a way that the pressure plate and lid are arched outward. This creates a leakage gap between the rotationally driven pump element and the cover-side pressure plate, which has an unfavorable effect on the volumetric efficiency of the pump.
  • a pump comprising a housing in which a recess is formed.
  • a pump unit is arranged, which has a pump chamber formed by a pump chamber ring and at least one lying on the pump chamber ring pressure plate.
  • the pump unit has a rotatably driven pump element which is arranged in the pump chamber.
  • the pump further comprises a recess closing the recess Housing cover and a pressure chamber which is limited at least partially by the recess. It is envisaged that the housing cover and the cover-side pressure plate are integrally formed.
  • the pump is characterized in that between the housing cover and pressure plate, a more or less thick spacer is formed and that between the housing cover and this pressure plate at least one at least partially circumferential to the pressure plate edge open pocket or at least partially circumferential cavity is formed.
  • the depth of the pocket or cavity is about the same as the thickness of the pump chamber ring.
  • the contact surface or edge or the lever arm of the pump chamber ring in the pocket or cavity area acts for the transmission of force between pump chamber ring and the housing cover-side pressure plate, so that the deflection of the pressure plate is correspondingly large. From this it is clear that the depth of the pocket / cavity can affect the deflection of the printing plate.
  • the pocket or cavity sidewalls are formed approximately parallel to the pressure plate annular surface of the pressure plate facing the pump chamber ring. Such a bag is easy to produce.
  • the depth of the pocket or cavity is constant. In another embodiment, the depth of the pocket or the cavity may vary in the circumferential direction, whereby an adjustment or influence on the deflection in dependence on the number of pressure ranges of the pump unit is possible.
  • the pump element facing pressure plate circular surface of the integrally formed with the housing cover pressure plate is flat. Flat surfaces are particularly easy to produce in production.
  • the pressure plate annular surface and the pressure plate circular surface lie in one plane.
  • the whole of the pump unit facing pressure plate surface is formed flat, so that the production of the housing cover with the one-piece pressure plate can be performed particularly cost.
  • the housing cover according to the invention described below with the pressure plate can be used for vane, Sperreriel- and roller-cell pumps, in which the rotatably driven pump element is formed by a rotor in which - depending on Pumpenart- wings or rollers are used or which is realized as a contour element , It would also be conceivable, however, the housing cover according to the invention to be used with a gear pump. Such pumps or their function are known per se, so that in the following the exact configuration of the rotary-driven pump element is not described in detail.
  • FIG. 1 shows in a greatly simplified manner a pump 1 in cross-section which comprises a housing 2.
  • a recess 3 is formed, which is closed by a housing cover 4.
  • the housing cover 4 is fixedly connected to the housing 2 via fastening means 5, for example screws.
  • a pump unit 6 which has a pump chamber 7, which is formed by a pump chamber ring 8 and two resting on the annular surfaces 9 and 10 pressure plates 11 and 12.
  • the pump chamber 7 can be closed on one side of the base 13 of the recess 3.
  • One of the pressure plates 11 is adjacent to the bottom 13 of the recess 3. Between this pressure plate 11 and the bottom 13 is a pressure chamber 14 of the pump first
  • a medium conveyed by a rotatably driven pump element 15 is introduced.
  • the rotatably driven pump element 15 is the above-mentioned rotor of a vane-cell, paddle-roller or roller-cell pump or a gearwheel, respectively Gear pump.
  • This pump element 15 is rotationally driven via a drive shaft, not shown here, which is mounted in the housing 2.
  • a so-called leakage gap 16 is formed, which is present in the pump according to the invention, however, substantially only at a standstill of the pump 1.
  • the housing cover 4 and the pressure plate 12 are integrally formed, wherein the diameter of the housing cover 4 is greater than that of the pressure plate 12. With its radially outer edge region 17 of the housing cover 4 rests on the edge of the housing. In this edge region 17 openings 18 are formed, through which the fastening means 5 engage. In the one-piece component of the housing cover 4 and pressure plate 12, a circumferential pocket 19 is introduced, which is designed to be open towards the pressure plate edge 20.
  • the Taschen hygienewandept 21 and 22 extend substantially parallel to a pump chamber ring 8 facing Druckplattenring Structure 23 of the pressure plate 12. The Druckplattenring Supplies 23 rests on the annular surface 10 of the pump chamber ring.
  • the depth T of the circumferential pocket 19 is slightly greater than the thickness S of the pump chamber ring 8.
  • the depth T of the pocket is constant in the embodiment shown.
  • the depth T of the pocket in the circumferential direction may also vary, especially if the pump has more than one pressure range, as in the case of the aforementioned types of pumps is often the case or if the pump chamber ring 8 is not completely circular.
  • vane, Sperreriel- and roller-cell pumps at least two suction and two pressure areas can be formed. The or the pressure ranges are in fluid communication with the pressure chamber 14, so that it is acted upon by the pressure of the pumped medium.
  • FIG. 1 also shows that the pressure plate circular surface 26 of the cover-side pressure plate 12 facing the rotationally driven pump element 15 is substantially planar. It thus becomes clear that both the pressure plate ring surface 23 and the pressure plate circular surface 26 lie in one plane, that is to say they are made essentially planar. "Substantially” means that in the pressure plate circular surface 26, inter alia, so-called pressure and suction recesses may be present, which, moreover, can also be formed on the pressure plate 11 on the surface facing the pump element 15.
  • a more or less thick spacer 27 is formed between the housing cover 4 and pressure plate 12, whose cross-section is smaller than that of the housing cover 4 and the pressure plate 12.
  • the pressure chamber 14 is acted upon by the pressure of the pumped medium.
  • the pressure plate 11 forces that would push this pressure plate 11 from the bottom 13 of the recess 3.
  • These forces (arrow 31) are transmitted from the pressure plate 11 via a substantially circular annular surface 30 on the annular surface 9 on the pump chamber ring 8.
  • the pump chamber ring 8 transmits via its annular surface 10 these forces (arrows 31) on the pressure plate ring surface 23 on the pressure plate 12. It is clear that the contact surface between ring 8 and pressure plate 11 and 12 need not necessarily be circular. It can also be elliptical.
  • recesses can be present between the pressure plate 11 or 12 and ring 8 in the region of their contact surfaces, which can form, for example, the suction connection.
  • These forces 31 act on a larger diameter range than the forces 28 in the support force transmission region K from the housing cover 4 to the pressure plate 12.
  • the housing cover 4 which is also referred to as a bulge or rocker cover, and the pressure plate 12 integrally formed with the housing cover 4, a single component is thus realized with two different bending shapes, the two bending shapes being in opposite directions, that is, the formation of a belly in opposite directions.
  • these two bending forms are caused by means of a single force component, namely the force 31, against the holding forces of the fastening means 5.
  • FIG. 3 shows a further exemplary embodiment of a housing cover 4 with a pressure plate 12 integrally formed thereon.
  • Identical or identically acting parts as in FIGS. 1 and 2 are provided with the same reference numerals in FIG.
  • cover 4 instead of the pocket 19, a cavity 19 'is formed, which is not designed to be open like the pocket 19.
  • Such a cavity 19 ' can be produced for example by a so-called lost core when the one-piece component is cast from housing cover 4 and pressure plate 12 or optionally also sintered.
  • the depth T of the cavity 19 'or its width B is variable in order to influence the deflection can.
  • the pressure plate 12 project beyond the outer peripheral surface of the ring 8. It is expressly pointed out that the configurations or arrangements mentioned above in connection with the pocket 19 also apply to the cavity 19 '.
  • the housing cover 4 and the pressure plate 12 need not be made particularly thick or stiff. Rather, the invention makes use of a predeterminable elastic material bending on the cover 4 and the pressure plate.
  • the pump 1 is thus characterized by an improved volumetric efficiency.

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

Description

Die Erfindung betrifft eine Pumpe mit einem Gehäuse, das eine Ausnehmung aufweist, in der eine Pumpeneinheit angeordnet ist, die eine von einem Pumpenkammerring und zumindest einer auf dem Pumpenkammerring liegenden Druckplatte gebildete Pumpenkammer und ein drehantreibbares Pumpenelement besitzt, das in der Pumpenkammer angeordnet ist, einem die Ausnehmung verschließenden, am Gehäuse befestigten Gehäusedeckel und mit einem von der Ausnehmung und der Druckplatte begrenzten Druckraum.The invention relates to a pump having a housing which has a recess in which a pump unit is arranged, which has a pump chamber formed by a pump chamber ring and at least one located on the pump chamber ring pressure plate and a rotatably driven pump element which is arranged in the pump chamber, a the recess closing, fixed to the housing housing cover and with a limited by the recess and the pressure plate pressure chamber.

Pumpen der hier angesprochenen Art sind bekannt. Sie weisen ein Gehäuse auf, in dem eine Ausnehmung ausgebildet ist. In diese Ausnehmung wird eine Pumpeneinheit eingesetzt. Diese Pumpeneinheit besitzt eine Pumpenkammer, die von einem Pumpenkammerring und zumindest einer auf dem Pumpenkammerring liegenden Druckplatte gebildet wird. Es können auch zwei Druckplatten vorgesehen sein. Die Pumpeneinheit umfasst ferner ein drehantreibbares Pumpenelement, das in der Pumpenkammer angeordnet ist. Die Ausnehmung in dem Gehäuse wird von einem Gehäusedeckel verschlossen. Bei einer bekannten Pumpe (US 2765745) ist eine der Druckplatten einstückig mit dem Gehäusedeckel ausgebildet und wird von dem Gehäusedeckel an den Pumpenkammerring gedrängt. Au-ßerdem besitzt die Pumpe einen Druckraum, der von der anderen Druckplatte und der Ausnehmung oder direkt von der Wand der Ausnehmung begrenzt wird. Im Betrieb der Pumpe befindet sich in dem Druckraum unter Druck das von dem drehangetriebenen Pumpenelement geförderte Medium. Dieses drückt auf die Druckplatte, die diese Kraft wiederum an den Pumpenkammerring überträgt, der somit die andere Druckplatte radial außen mit einer axial wirkenden Kraft beaufschlagt, die diese Druckplatte und den Gehäusedeckel verformt. Außerdem wirkt der Druck innerhalb des Pumpenelements derart, dass Druckplatte und Deckel nach außen gewölbt werden. Dabei entsteht zwischen dem drehangetriebenen Pumpenelement und der deckelseitigen Druckplatte ein Leckagespalt, der sich ungünstig auf den volumetrischen Wirkungsgrad der Pumpe auswirkt.Pumps of the type discussed here are known. They have a housing in which a recess is formed. In this recess, a pump unit is used. This pump unit has a pump chamber which is formed by a pump chamber ring and at least one pressure plate lying on the pump chamber ring. It can also be provided two printing plates. The pump unit further comprises a rotatably drivable pump element disposed in the pump chamber. The recess in the housing is closed by a housing cover. In a known pump (US 2765745) is one of the printing plates integral with formed on the housing cover and is urged by the housing cover to the pump chamber ring. In addition, the pump has a pressure chamber which is delimited by the other pressure plate and the recess or directly by the wall of the recess. During operation of the pump, the medium conveyed by the rotationally driven pump element is located in the pressure chamber under pressure. This presses on the pressure plate, which in turn transmits this force to the pump chamber ring, which thus acts on the other pressure plate radially outward with an axially acting force which deforms this pressure plate and the housing cover. In addition, the pressure within the pump element acts in such a way that the pressure plate and lid are arched outward. This creates a leakage gap between the rotationally driven pump element and the cover-side pressure plate, which has an unfavorable effect on the volumetric efficiency of the pump.

Es ist daher Aufgabe der Erfindung, eine Pumpe anzugeben, die einfach herstellbar ist und sich dennoch durch einen guten volumetrischen Wirkungsgrad auszeichnet.It is therefore an object of the invention to provide a pump that is easy to manufacture and yet is characterized by a good volumetric efficiency.

Gelöst wird diese Aufgabe mit einer Pumpe, die ein Gehäuse umfasst, in dem eine Ausnehmung ausgebildet ist. In der Ausnehmung ist eine Pumpeneinheit angeordnet, die eine von einem Pumpenkammerring und zumindest einer auf dem Pumpenkammerring liegenden Druckplatte gebildete Pumpenkammer besitzt. Ferner besitzt die Pumpeneinheit ein drehantreibbares Pumpenelement, das in der Pumpenkammer angeordnet ist. Die Pumpe umfasst ferner einen die Ausnehmung verschließenden Gehäusedeckel und einen Druckraum, der zumindest bereichsweise von der Ausnehmung begrenzt wird. Es ist vorgesehen, dass der Gehäusedeckel und die deckelseitige Druckplatte einstückig ausgebildet sind. Die Pumpe zeichnet sich dadurch aus, dass zwischen Gehäusedeckel und Druckplatte ein mehr oder weniger dickes Distanzstück ausgebildet ist und, dass zwischen Gehäusedeckel und dieser Druckplatte zumindest eine zumindest bereichsweise umlaufende zum Druckplattenrand hin offene Tasche oder ein zumindest bereichsweise umlaufender Hohlraum ausgebildet ist. Im Betrieb der erfindungsgemäßen Pumpe greifen die von der Druckplatte über den Pumpenkammerring auf die deckelseitige Druckplatte wirkenden axialen Druckkräfte auf einem grö-ßeren Durchmesser an als die entgegengesetzt wirkenden vom Deckel auf die Druckplatte angreifenden Kräfte, die über den Deckel an die einstückig mit ihm ausgebildete Druckplatte übertragen werden. Dadurch biegt sich die am Deckel ausgebildete Druckplatte in Richtung der Pumpeneinheit durch und verringert dadurch den Leckagespalt.This object is achieved with a pump comprising a housing in which a recess is formed. In the recess, a pump unit is arranged, which has a pump chamber formed by a pump chamber ring and at least one lying on the pump chamber ring pressure plate. Further, the pump unit has a rotatably driven pump element which is arranged in the pump chamber. The pump further comprises a recess closing the recess Housing cover and a pressure chamber which is limited at least partially by the recess. It is envisaged that the housing cover and the cover-side pressure plate are integrally formed. The pump is characterized in that between the housing cover and pressure plate, a more or less thick spacer is formed and that between the housing cover and this pressure plate at least one at least partially circumferential to the pressure plate edge open pocket or at least partially circumferential cavity is formed. During operation of the pump according to the invention, acting from the pressure plate on the pump chamber ring on the cover-side pressure plate axial compressive forces act on a larger ßeren diameter than the opposing acting from the lid on the pressure plate acting forces on the cover to the integrally formed with him pressure plate be transmitted. As a result, the pressure plate formed on the cover bends in the direction of the pump unit and thereby reduces the leakage gap.

Bei einem bevorzugten Ausführungsbeispiel ist die Tiefe der Tasche oder des Hohlraums etwa genau so groß wie die Stärke des Pumpenkammerringes. Dadurch wirkt für die Kraftübertragung zwischen Pumpenkammerring und der gehäusedeckelseitigen Druckplatte die Berührfläche oder -kante beziehungsweise der Hebelarm des Pumpenkammerringes im Taschen- oder Hohlraumbereich, so dass die Durchbiegung der Druckplatte entsprechend groß ist. Daraus wird klar, dass durch die Tiefe der Tasche/des Hohlraums die Durchbiegung der Druckplatte beeinflusst werden kann.In a preferred embodiment, the depth of the pocket or cavity is about the same as the thickness of the pump chamber ring. As a result, the contact surface or edge or the lever arm of the pump chamber ring in the pocket or cavity area acts for the transmission of force between pump chamber ring and the housing cover-side pressure plate, so that the deflection of the pressure plate is correspondingly large. From this it is clear that the depth of the pocket / cavity can affect the deflection of the printing plate.

Bei einem bevorzugten Ausführungsbeispiel sind die Taschen- beziehungsweise Hohlraumseitenwandungen etwa parallel zu der dem Pumpenkammerring zugewandten Druckplattenringfläche der Druckplatte ausgebildet. Eine derartige Tasche ist leicht herstellbar.In a preferred embodiment, the pocket or cavity sidewalls are formed approximately parallel to the pressure plate annular surface of the pressure plate facing the pump chamber ring. Such a bag is easy to produce.

Bei einem Ausführungsbeispiel ist die Tiefe der Tasche beziehungsweise des Hohlraums konstant. Bei einem anderen Ausführungsbeispiel kann die Tiefe der Tasche beziehungsweise des Hohlraums in Umfangsrichtung variieren, wodurch eine Anpassung beziehungsweise Beeinflussung der Durchbiegung in Abhängigkeit der Anzahl der Druckbereiche der Pumpeneinheit möglich ist.In one embodiment, the depth of the pocket or cavity is constant. In another embodiment, the depth of the pocket or the cavity may vary in the circumferential direction, whereby an adjustment or influence on the deflection in dependence on the number of pressure ranges of the pump unit is possible.

Bei druckloser Pumpe ist die dem Pumpenelement zugewandte Druckplattenkreisfläche der mit dem Gehäusedeckel einstückig ausgebildeten Druckplatte eben ausgebildet. Ebene Flächen lassen sich in der Fertigung besonders leicht herstellen.In a non-pressurized pump, the pump element facing pressure plate circular surface of the integrally formed with the housing cover pressure plate is flat. Flat surfaces are particularly easy to produce in production.

Bei einer Ausführungsform ist vorgesehen, dass im Stillstand der Pumpe beziehungsweise bei druckloser Pumpe die Druckplattenringfläche und die Druckplattenkreisfläche in einer Ebene liegen. Somit wird die gesamte der Pumpeneinheit zugewandte Druckplattenfläche eben ausgebildet, so dass die Herstellung des Gehäusedeckels mit der einstückigen Druckplatte besonders kostengünstig ausgeführt werden kann.In one embodiment, it is provided that, when the pump is at a standstill or when the pump is without pressure, the pressure plate annular surface and the pressure plate circular surface lie in one plane. Thus, the whole of the pump unit facing pressure plate surface is formed flat, so that the production of the housing cover with the one-piece pressure plate can be performed particularly cost.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels mit Bezug auf die Zeichnung näher erläutert. Es zeigen:

Figur 1
einen Querschnitt durch eine stark vereinfacht wiedergegebene Pumpe mit einem Gehäusedeckel nach einem ersten Ausführungsbeispiel,
Figur 2
einen einstückig mit einer Druckplatte ausgebildeten Gehäusedeckel der Pumpe nach Figur 1 und
Figur 3
einen Querschnitt durch eine stark vereinfacht wiedergegebene Pumpe mit einem Gehäusedeckel nach einem zweiten Ausführungsbeispiel.
The invention will be explained in more detail using an exemplary embodiment with reference to the drawing. Show it:
FIG. 1
a cross section through a highly simplified reproduced pump with a housing cover according to a first embodiment,
FIG. 2
an integrally formed with a pressure plate housing cover of the pump of Figure 1 and
FIG. 3
a cross section through a greatly simplified reproduced pump with a housing cover according to a second embodiment.

Der im Folgenden beschriebene erfindungsgemäße Gehäusedeckel mit der Druckplatte lässt sich für Flügelzellen-, Sperrflügel- und Rollenzellenpumpen verwenden, bei denen das drehantreibbare Pumpenelement durch einen Rotor gebildet wird, in dem -je nach Pumpenart- Flügel oder Rollen eingesetzt sind oder der als Konturelement realisiert ist. Denkbar wäre es jedoch auch, den erfindungsgemäßen Gehäusedeckel bei einer Zahnradpumpe zu verwenden. Derartige Pumpen beziehungsweise deren Funktion sind an sich bekannt, so dass im Folgenden die genaue Ausgestaltung des drehantreibbaren Pumpenelements nicht näher beschrieben ist.The housing cover according to the invention described below with the pressure plate can be used for vane, Sperrflügel- and roller-cell pumps, in which the rotatably driven pump element is formed by a rotor in which - depending on Pumpenart- wings or rollers are used or which is realized as a contour element , It would also be conceivable, however, the housing cover according to the invention to be used with a gear pump. Such pumps or their function are known per se, so that in the following the exact configuration of the rotary-driven pump element is not described in detail.

Figur 1 zeigt stark vereinfacht eine Pumpe 1 im Querschnitt, die ein Gehäuse 2 umfasst. In dem Gehäuse 2 ist eine Ausnehmung 3 ausgebildet, die von einem Gehäusedeckel 4 verschlossen wird. Der Gehäusedeckel 4 ist über Befestigungsmittel 5, beispielsweise Schrauben, fest mit dem Gehäuse 2 verbunden.FIG. 1 shows in a greatly simplified manner a pump 1 in cross-section which comprises a housing 2. In the housing 2, a recess 3 is formed, which is closed by a housing cover 4. The housing cover 4 is fixedly connected to the housing 2 via fastening means 5, for example screws.

In der Ausnehmung 3 ist eine Pumpeneinheit 6 angeordnet, die eine Pumpenkammer 7 besitzt, die von einem Pumpenkammerring 8 und zwei auf dessen Ringflächen 9 und 10 aufliegenden Druckplatten 11 und 12 gebildet wird. Anstelle der Druckplatte 11 kann die Pumpenkammer 7 an ihrer einen Seite auch vom Grund 13 der Ausnehmung 3 verschlossen werden. Eine der Druckplatten 11 liegt benachbart zu dem Grund 13 der Ausnehmung 3. Zwischen dieser Druckplatte 11 und dem Grund 13 liegt ein Druckraum 14 der Pumpe 1.In the recess 3, a pump unit 6 is arranged, which has a pump chamber 7, which is formed by a pump chamber ring 8 and two resting on the annular surfaces 9 and 10 pressure plates 11 and 12. Instead of the pressure plate 11, the pump chamber 7 can be closed on one side of the base 13 of the recess 3. One of the pressure plates 11 is adjacent to the bottom 13 of the recess 3. Between this pressure plate 11 and the bottom 13 is a pressure chamber 14 of the pump first

In den Druckraum 14, der eine Verbindung zu einem hier nicht dargestellten pumpenseitigen Verbraucheranschluss aufweist, wird ein von einem drehantreibbaren Pumpenelement 15 gefördertes Medium eingebracht. Bei dem drehantreibbaren Pumpenelement 15 handelt es sich um den vorstehend erwähnten Rotor einer Flügelzellen-, Sperrflügel- oder Rollenzellenpumpe beziehungsweise um ein Zahnrad einer Zahnradpumpe. Dieses Pumpenelement 15 ist über eine hier nicht dargestellte Antriebswelle, die im Gehäuse 2 gelagert ist, drehangetrieben. Zwischen dem in der Pumpenkammer 7 angeordneten Pumpenelement 15 und der dem Druckraum 14 abgewandten deckelseitigen Druckplatte 12 ist ein sogenannter Leckagespalt 16 ausgebildet, der bei der erfindungsgemäßen Pumpe jedoch im wesentlichen nur im Stillstand der Pumpe 1 vorliegt.In the pressure chamber 14, which has a connection to a pump-side consumer connection, not shown here, a medium conveyed by a rotatably driven pump element 15 is introduced. The rotatably driven pump element 15 is the above-mentioned rotor of a vane-cell, paddle-roller or roller-cell pump or a gearwheel, respectively Gear pump. This pump element 15 is rotationally driven via a drive shaft, not shown here, which is mounted in the housing 2. Between the arranged in the pump chamber 7 pump element 15 and the pressure chamber 14 facing away from the lid-side pressure plate 12, a so-called leakage gap 16 is formed, which is present in the pump according to the invention, however, substantially only at a standstill of the pump 1.

Der Gehäusedeckel 4 und die Druckplatte 12 sind einstückig ausgebildet, wobei der Durchmesser des Gehäusedeckels 4 größer ist als der der Druckplatte 12. Mit seinem radial außenliegenden Randbereich 17 liegt der Gehäusedeckel 4 auf dem Gehäuserand auf. In diesem Randbereich 17 sind Durchbrüche 18 ausgebildet, durch die die Befestigungsmittel 5 greifen. In das einstückige Bauteil aus Gehäusedeckel 4 und Druckplatte 12 ist eine umlaufende Tasche 19 eingebracht, die zum Druckplattenrand 20 hin offen ausgebildet ist. Die Taschenseitenwandungen 21 und 22 verlaufen im wesentlichen parallel zu einer dem Pumpenkammerring 8 zugewandten Druckplattenringfläche 23 der Druckplatte 12. Die Druckplattenringfläche 23 liegt auf der Ringfläche 10 des Pumpenkammerrings auf. Im Ausführungsbeispiel ist die Tiefe T der umlaufenden Tasche 19 etwas größer als die Stärke S des Pumpenkammerrings 8. Die Tiefe T der Tasche ist im gezeigten Ausführungsbeispiel konstant. Es wird jedoch klar, dass die Tiefe T der Tasche in Umlaufrichtung beziehungsweise Umfangsrichtung auch variieren kann, insbesondere dann, wenn die Pumpe mehr als einen Druckbereich aufweist, wie dies bei den vorstehend erwähnten Pumpenarten häufig der Fall ist oder wenn der Pumpenkammerring 8 nicht vollständig kreisförmig ist. Insbesondere bei Flügelzellen-, Sperrflügel- und Rollenzellenpumpen können zumindest zwei Saug- und zwei Druckbereiche ausgebildet sein. Der beziehungsweise die Druckbereiche stehen mit dem Druckraum 14 in Fluidverbindung, so dass dieser mit dem Druck des geförderten Mediums beaufschlagt ist.The housing cover 4 and the pressure plate 12 are integrally formed, wherein the diameter of the housing cover 4 is greater than that of the pressure plate 12. With its radially outer edge region 17 of the housing cover 4 rests on the edge of the housing. In this edge region 17 openings 18 are formed, through which the fastening means 5 engage. In the one-piece component of the housing cover 4 and pressure plate 12, a circumferential pocket 19 is introduced, which is designed to be open towards the pressure plate edge 20. The Taschenseitenwandungen 21 and 22 extend substantially parallel to a pump chamber ring 8 facing Druckplattenringfläche 23 of the pressure plate 12. The Druckplattenringfläche 23 rests on the annular surface 10 of the pump chamber ring. In the exemplary embodiment, the depth T of the circumferential pocket 19 is slightly greater than the thickness S of the pump chamber ring 8. The depth T of the pocket is constant in the embodiment shown. However, it will be understood that the depth T of the pocket in the circumferential direction may also vary, especially if the pump has more than one pressure range, as in the case of the aforementioned types of pumps is often the case or if the pump chamber ring 8 is not completely circular. Especially with vane, Sperrflügel- and roller-cell pumps, at least two suction and two pressure areas can be formed. The or the pressure ranges are in fluid communication with the pressure chamber 14, so that it is acted upon by the pressure of the pumped medium.

Figur 1 zeigt noch, dass die dem drehangetriebenen Pumpenelement 15 zugewandte Druckplattenkreisfläche 26 der deckelseitigen Druckplatte 12 im wesentlichen eben ausgebildet ist. Es wird also klar, dass sowohl die Druckplattenringfläche 23 und die Druckplattenkreisfläche 26 in einer Ebene liegen, also im wesentlichen eben hergestellt sind. "Im wesentlichen" bedeutet, dass in der Druckplattenkreisfläche 26 unter anderem sogenannte Druck- und Saugausnehmungen vorhanden sein können, die im übrigen auch an der dem Pumpenelement 15 zugewandten Fläche an der Druckplatte 11 ausbildbar sind.FIG. 1 also shows that the pressure plate circular surface 26 of the cover-side pressure plate 12 facing the rotationally driven pump element 15 is substantially planar. It thus becomes clear that both the pressure plate ring surface 23 and the pressure plate circular surface 26 lie in one plane, that is to say they are made essentially planar. "Substantially" means that in the pressure plate circular surface 26, inter alia, so-called pressure and suction recesses may be present, which, moreover, can also be formed on the pressure plate 11 on the surface facing the pump element 15.

Je nach Breite B der Tasche 19 wird zwischen Gehäusedeckel 4 und Druckplatte 12 ein mehr oder weniger dickes Distanzstück 27 ausgebildet, dessen Querschnitt geringer als der des Gehäusedeckels 4 und der Druckplatte 12 ist. Somit ist eine Übertragung einer Stützkraft (Doppelpfeile 28) von dem Gehäusedeckel 4 über das Distanz- oder Zwischenstück 27 zu der Druckplatte 12 lediglich in einem Kraftübertragungsbereich K möglich, der dem Durchbruch 29 des Pumpenkammerrings 8 gegenüber liegt.Depending on the width B of the pocket 19, a more or less thick spacer 27 is formed between the housing cover 4 and pressure plate 12, whose cross-section is smaller than that of the housing cover 4 and the pressure plate 12. Thus, a transmission of a supporting force (double arrows 28) from the housing cover 4 via the spacer or intermediate piece 27 to the pressure plate 12 only in a power transmission region K is possible, which lies opposite the opening 29 of the pump chamber ring 8.

Im Betrieb der Pumpe ist der Druckraum 14 mit dem Druck des geförderten Mediums beaufschlagt. Somit wirken auf die Druckplatte 11 Kräfte, die diese Druckplatte 11 von dem Grund 13 der Ausnehmung 3 wegdrängen würden. Diese Kräfte (Pfeil 31) werden von der Druckplatte 11 über eine im wesentlichen kreisförmige Ringfläche 30 auf die Ringfläche 9 an dem Pumpenkammerring 8 übertragen. Der Pumpenkammerring 8 wiederum überträgt über seine Ringfläche 10 diese Kräfte (Pfeile 31) auf die Druckplattenringfläche 23 an der Druckplatte 12. Es wird klar, dass die Berührfläche zwischen Ring 8 und Druckplatte 11 beziehungsweise 12 nicht zwingend kreisförmig sein muss. Sie kann auch ellipsenförmig sein. Außerdem können zwischen Druckplatte 11 beziehungsweise 12 und Ring 8 im Bereich ihrer Berührflächen Ausnehmungen vorliegen, die beispielsweise den Sauganschluss bilden können. Diese Kräfte 31 wirken auf einem größeren Durchmesserbereich als die Kräfte 28 im Stützkraftübertragungsbereich K von dem Gehäusedeckel 4 zur Druckplatte 12.During operation of the pump, the pressure chamber 14 is acted upon by the pressure of the pumped medium. Thus act on the pressure plate 11 forces that would push this pressure plate 11 from the bottom 13 of the recess 3. These forces (arrow 31) are transmitted from the pressure plate 11 via a substantially circular annular surface 30 on the annular surface 9 on the pump chamber ring 8. The pump chamber ring 8 in turn transmits via its annular surface 10 these forces (arrows 31) on the pressure plate ring surface 23 on the pressure plate 12. It is clear that the contact surface between ring 8 and pressure plate 11 and 12 need not necessarily be circular. It can also be elliptical. In addition, recesses can be present between the pressure plate 11 or 12 and ring 8 in the region of their contact surfaces, which can form, for example, the suction connection. These forces 31 act on a larger diameter range than the forces 28 in the support force transmission region K from the housing cover 4 to the pressure plate 12.

In Figur 2 ist die aus den Kräften 31 und 28 sowie den Kräften aus der Pumpenkammer 7 resultierende Verformung des Gehäusedeckels 4 und der Druckplatte 12 sehr stark übertrieben dargestellt. Es wird deutlich, dass die Druckplatte 12 an ihrer Druckplattenkreisfläche 26 eine Wölbung ausbildet, deren Bauch in den Leckagespalt. 16 hineinragt, so dass die Spaltbreite des Leckagespalts 16 verringert wird, wodurch sich der volumetrische Wirkungsgrad der Pumpe 1 erhöht. Durch die von der Druckplatte 11 und dem Pumpenkammerring 8 auf die Druckplatte 12 übertragenen Kräfte 31 wird der Deckel 4 nach außen gewölbt, da er lediglich in seinem Randbereich 17 mit den Befestigungsmitteln 5 am Gehäuse 2 befestigt ist.In Figure 2, the resulting from the forces 31 and 28 and the forces from the pump chamber 7 deformation of the housing cover 4 and the pressure plate 12 is shown greatly exaggerated. It is clear that the pressure plate 12 forms a curvature on its pressure plate circular surface 26, the belly in the leakage gap. 16 protrudes, so that the gap width of the leakage gap 16 is reduced, whereby the volumetric efficiency of the pump 1 increases. By the transmitted from the pressure plate 11 and the pump chamber ring 8 on the pressure plate 12 forces 31 of the cover 4 is after curved outside, since it is attached only in its edge region 17 with the fastening means 5 on the housing 2.

Mit dem auch als Beul- oder Wippdeckel bezeichneten Gehäusedeckel 4 und der mit dem Gehäusedeckel 4 einstückig ausgebildeten Druckplatte 12 wird also ein einziges Bauteil mit zwei unterschiedlichen Biegeformen realisiert, wobei die beiden Biegeformen gegenläufig sind, also die Ausbildung eines Bauches in entgegengesetzte Richtungen erfolgt. Diese beiden Biegeformen werden jedoch mittels einer einzigen Kraftkomponente, nämlich der Kraft 31, gegen die Haltekräfte der Befestigungsmittel 5 hervorgerufen.With the housing cover 4, which is also referred to as a bulge or rocker cover, and the pressure plate 12 integrally formed with the housing cover 4, a single component is thus realized with two different bending shapes, the two bending shapes being in opposite directions, that is, the formation of a belly in opposite directions. However, these two bending forms are caused by means of a single force component, namely the force 31, against the holding forces of the fastening means 5.

Figur 3 zeigt ein weiteres Ausführungsbeispiel eines Gehäusedeckels 4 mit einer daran einstückig ausgebildeten Druckplatte 12. Gleiche beziehungsweise gleich wirkende Teile wie in den Figuren 1 und 2 sind in Figur 3 mit denselben Bezugszeichen versehen. Bei diesem Gehäusedeckel 4 ist anstelle der Tasche 19 ein Hohlraum 19' ausgebildet, der -nicht wie die Tasche 19- randoffen ausgebildet ist. Ein derartiger Hohlraum 19' kann beispielsweise durch einen sogenannten verlorenen Kern hergestellt werden, wenn das einstückige Bauteil aus Gehäusedeckel 4 und Druckplatte 12 gegossen oder gegebenenfalls auch gesintert wird. Selbstverständlich ist klar, dass die Tiefe T des Hohlraums 19' beziehungsweise seine Breite B variabel ist, um die Durchbiegung beeinflussen zu können. Denkbar ist es auch, wie im übrigen auch bei der Tasche 19, den Hohlraum 19' in der Druckplatte 12 mehr oder weniger beabstandet zu der Fläche 10 des Pumpenkammerrings 8 anzuordnen. Außerdem kann -wie in Figur 3 dargestellt- die Druckplatte 12 die äußere Umfangsfläche des Ringes 8 überragen. Ausdrücklich wird noch darauf hingewiesen, dass die im Zusammenhang mit der Tasche 19 vorstehend erwähnten Ausgestaltungen beziehungsweise Anordnungen auch für den Hohlraum 19' gelten.FIG. 3 shows a further exemplary embodiment of a housing cover 4 with a pressure plate 12 integrally formed thereon. Identical or identically acting parts as in FIGS. 1 and 2 are provided with the same reference numerals in FIG. In this case cover 4, instead of the pocket 19, a cavity 19 'is formed, which is not designed to be open like the pocket 19. Such a cavity 19 'can be produced for example by a so-called lost core when the one-piece component is cast from housing cover 4 and pressure plate 12 or optionally also sintered. Of course, it is clear that the depth T of the cavity 19 'or its width B is variable in order to influence the deflection can. It is also conceivable, as well as in the case of the pocket 19, the cavity 19 'in the pressure plate 12 more or less spaced from the surface 10 of the pump chamber ring 8 to be arranged. In addition, as shown in Figure 3, the pressure plate 12 project beyond the outer peripheral surface of the ring 8. It is expressly pointed out that the configurations or arrangements mentioned above in connection with the pocket 19 also apply to the cavity 19 '.

Es zeigt sich also, dass mit diesem einstückigen Bauteil aus Gehäusedeckel 4 und Druckplatte 12 eine sehr einfach und kostengünstig zu realisierende Maßnahme zur Verringerung des Leckagespalts 16 gegeben ist. Der Gehäusedeckel 4 und die Druckplatte 12 müssen also nicht besonders dick beziehungsweise steif ausgestaltet werden. Vielmehr macht sich die Erfindung eine vorgebbare elastische Materialbiegung an dem Deckel 4 und der Druckplatte zu Nutze. Die Pumpe 1 zeichnet sich somit durch einen verbesserten volumetrischen Wirkungsgrad aus.It thus turns out that a very simple and cost-effective measure for reducing the leakage gap 16 is given with this one-piece component of the housing cover 4 and pressure plate 12. The housing cover 4 and the pressure plate 12 need not be made particularly thick or stiff. Rather, the invention makes use of a predeterminable elastic material bending on the cover 4 and the pressure plate. The pump 1 is thus characterized by an improved volumetric efficiency.

Die mit der Anmeldung eingereichten Patentansprüche sind Formulierungsvorschläge ohne Präjudiz weitergehenden Patentschutzes. Die Anmelderin behält sich vor, noch weitere, bisher nur in der Beschreibung und/oder den Zeichnungen offenbarte Merkmalskombinationen zu beanspruchen.The claims filed with the application are formulation proposals without prejudice to further patent protection. The Applicant reserves the right to claim further combinations of features previously disclosed only in the description and / or the drawings.

In Unteransprüchen verwendete Rückbeziehungen weisen auf die weitere Ausbildung des Gegenstandes des Hauptanspruchs durch die Merkmale des jeweiligen Unteranspruches hin; sie sind nicht als ein Verzicht auf die Erzielung eines selbständigen, gegenständlichen Schutzes für die Merkmalskombinationen der rückbezogenen Unteransprüche zu verstehen.Relationships used in subclaims indicate the further development of the subject matter of the main claim by the features of the respective subclaim; they are not as a renunciation of the achievement of an independent, representational To understand protection for the feature combinations of the dependent claims.

Claims (6)

  1. Pump (1) with a housing (2), which has a recess (3) in which a pump unit (6) is arranged, which has a pump chamber (7) formed by a pump chamber ring (8) and at least one pressure plate (12) on the pump chamber ring (8), and a rotationally driveable pump element (15), which is arranged in the pump chamber (7), a housing cover (4), which closes the recess (3) and is fixed to the housing (2), and with a pressure chamber (14) bounded by the recess (3) and the pressure plate (12), wherein the housing cover (4) and the pressure plate (12) are designed as one piece, characterised in that a more or less thick spacer (27) is constructed between the housing cover (4) and the pressure plate (12), that the cross-section of the spacer (27) is less than that of the housing cover (4) and the pressure plate (12), and that, as a result, at least one open pocket (19), which runs around at least parts of the circumference, or a hollow space (19'), which runs around at least parts of the circumference, is formed between housing cover (4) and pressure plate (12), the depth of the pocket (19) or of the hollow space (19') corresponding approximately to the thickness of the pump chamber ring (8).
  2. Pump according to Claim 1, characterised in that the side walls (21, 22) of the pocket or hollow space are arranged approximately parallel to the pressure plate annular surface (23) of the pressure plate (12) facing the pump chamber ring (8).
  3. Pump according to one of the preceding claims, characterised in that the depth of the pocket (19) or of the hollow space (19') is constant.
  4. Pump according to one of Claims 1 or 2, characterised in that the depth of the pocket (19) or of the hollow space (19') varies in the circumferential direction.
  5. Pump according to one of the preceding claims, characterised in that when the pump (1) is stopped, the pressure plate circular area (26) facing the pump element (15) is designed to be flat.
  6. Pump according to one of the preceding claims, characterised in that when the pump (1) is stopped, the pressure plate annular area (23) and the pressure plate circular area (26) are arranged in one plane.
EP01940549A 2000-06-05 2001-06-01 Pump Expired - Lifetime EP1292769B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2000127812 DE10027812A1 (en) 2000-06-05 2000-06-05 Cellular pump housing with cover and pressure plates has plate and cover in one piece giving interposed constant depth pocket equal to chamber ring thickness.
DE10027812 2000-06-05
PCT/EP2001/006301 WO2001094787A1 (en) 2000-06-05 2001-06-01 Pump

Publications (2)

Publication Number Publication Date
EP1292769A1 EP1292769A1 (en) 2003-03-19
EP1292769B1 true EP1292769B1 (en) 2007-04-18

Family

ID=7644758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01940549A Expired - Lifetime EP1292769B1 (en) 2000-06-05 2001-06-01 Pump

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Country Link
EP (1) EP1292769B1 (en)
DE (3) DE10027812A1 (en)
ES (1) ES2283416T3 (en)
WO (1) WO2001094787A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765745A (en) * 1955-02-21 1956-10-09 Harry J Sadler Pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE460623C (en) * 1924-09-19 1928-06-01 Gustav Appel Circumferential seal for gear pumps, especially for conveying viscose to spinnerets
DE1788270U (en) * 1956-09-06 1959-05-06 Bosch Gmbh Robert GEAR LIQUID PUMP.
US4605363A (en) * 1985-03-25 1986-08-12 Sundstrand Corporation Gear pump with pivoted bushings that can deflect
DE4007858C1 (en) * 1990-03-13 1991-08-14 Rhone-Poulenc Rhodia Ag, 7800 Freiburg, De Rotary liquid pump - has pump coupled to block by symmetrically placed fastening screws
DE19528631C2 (en) * 1995-08-04 1998-07-23 Bosch Gmbh Robert Gear machine
DE19626206A1 (en) * 1996-06-29 1998-01-08 Luk Fahrzeug Hydraulik Vane pump

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765745A (en) * 1955-02-21 1956-10-09 Harry J Sadler Pump

Also Published As

Publication number Publication date
WO2001094787A1 (en) 2001-12-13
DE10027812A1 (en) 2001-12-13
ES2283416T3 (en) 2007-11-01
DE50112376D1 (en) 2007-05-31
DE10192360D2 (en) 2003-06-12
EP1292769A1 (en) 2003-03-19

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