EP0874157B1 - Rotary positive displacement pump - Google Patents

Rotary positive displacement pump Download PDF

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Publication number
EP0874157B1
EP0874157B1 EP98107092A EP98107092A EP0874157B1 EP 0874157 B1 EP0874157 B1 EP 0874157B1 EP 98107092 A EP98107092 A EP 98107092A EP 98107092 A EP98107092 A EP 98107092A EP 0874157 B1 EP0874157 B1 EP 0874157B1
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EP
European Patent Office
Prior art keywords
base plate
membrane
ring surface
displacement pump
annular surface
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
EP98107092A
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German (de)
French (fr)
Other versions
EP0874157A3 (en
EP0874157A2 (en
Inventor
Rolf Kammerer
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.)
Inotec GmbH Transport und Foerdersysteme
Inotec GmbH
Original Assignee
Inotec GmbH Transport und Foerdersysteme
Inotec GmbH
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Publication of EP0874157A2 publication Critical patent/EP0874157A2/en
Publication of EP0874157A3 publication Critical patent/EP0874157A3/en
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Publication of EP0874157B1 publication Critical patent/EP0874157B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
    • F04B43/1269—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing the rotary axes of the rollers lying in a plane perpendicular to the rotary axis of the driving motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/021—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms the plate-like flexible member is pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the plane of the plate-like flexible member and each having its own driving mechanism
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/14—Machines, pumps, or pumping installations having flexible working members having peristaltic action having plate-like flexible members

Definitions

  • the invention relates to a rotary displacement pump according to the preamble of the claim 1.
  • From DE-U-296 09 865 is a rotary displacement pump consisting of a stator and a rotor of the type specified at the outset.
  • the stator has an annular surface with inlet and outlet on which by a membrane to form a pump channel is covered.
  • On the membrane is a ring of individually movable against the membrane Pressure transmission elements in the form of plungers, which are made of upright Plate elements are formed.
  • a rotor is provided, which concentric Axis of the ring surface revolves. This rotor has rollers on the top of the pressure transmission members and thereby continuously locally against the membrane Press the ring surface so that the membrane progresses from the inlet to the outlet interrupts and pushes the pump material in front of it.
  • critical pump media which clump together when conveyed by such a pump.
  • To the critical Pump media include, for example, dispersions for structural plasters, effect paints (Color dispersions containing scale-like pigments, flakes or cutlets) and fibrous dispersions (e.g. cotton fibers in dispersion to form "liquid Wallpaper "). The dispersions become unusable due to clumping.
  • DE-A-35 42 454 discloses a diaphragm rotary pump. It is between the membrane and a rubber insert is arranged on the housing on the inner raceway.
  • This rubber insert should consist in that, on the one hand, a particularly favorable one Seal can be achieved especially with granular materials and that on the other hand because the higher elasticity, a longer service life can be achieved with greater silence.
  • the invention has for its object to reduce the tendency to clump in critical pumping media when pumping through a rotary displacement pump of the type specified.
  • the layer expediently extends from the softer material in accordance with the development in claim 2 only over that area of the pressure transmission members is covered. That is enough for optimal effectiveness.
  • the advantage of the training according to claim 3 is that between the location and the base plate cannot get any pump medium and is deposited there.
  • Silicones are suitable according to the further development in claim 4 as a softer material.
  • Hardness from 20 to 50 Shore have according to the training in claim 5 especially for the softer material proven.
  • the following are particularly suitable as dimensionally stable plastics: polyamide, ABS polymers and polystyrene.
  • the pump has a stator 1 and a rotor 2.
  • the stator 1 is part of the housing of the Pump and has a clamping plate 24, a hold-down 6, a base plate 3 and one Membrane 11 on.
  • the base plate 3 is annular and coaxial to the axis 4 of the Rotor 2 arranged.
  • the base plate 3 has a flat ring surface 5, which is limited by two conical clamping surfaces 9 and 10, which seen from the rotor 2 behind the Ring surface 5; they are opposite two further clamping surfaces 7 and 8, which on Hold-down devices 6 are formed and cooperate with the clamping surfaces 9 and 10 to clamp in between the membrane 11, which consists of an elastomeric material, is a ring-shaped, flat structure in a relaxed, non-installed state and is bent by clamping between the conical clamping surfaces 7 to 10, so that it arches the flat ring surface 5.
  • a pump channel 12 in this way formed in which an inlet 13 and an outlet 15, which expediently tight is located next to the inlet 13, and - just to be able to represent it - in Figure 1 in diagonal arrangement is provided.
  • the pump channel 12 is on the short path from the inlet 13 to the drain 15 by a survey 39 on the annular base plate 3 blocked by the elevations 39 in their radial section perpendicular to the base plate 3 are circular segment shaped.
  • the two elevations 39 are radial on the Annular surface 5 of the base plate 3 is arranged. It prevents the pumping medium can penetrate into the area in the direction of rotation of the rotor 2 between outlet 15 and inlet 13 is.
  • a filler material is introduced into an indentation 41 in the annular surface 5.
  • the Recess 41 extends approximately along the entire pump channel 12 from the inlet 13 to the drain 15.
  • a one-piece silicone bed is used as the filling material 35.
  • the recess 41 is expediently rectangular in cross section, just as like the silicone bed 35, which is inserted precisely into the recess 41.
  • the deepening 41 and the silicone bed 35 lying in it are facing the inlet or outlet 13, 15 Ends so delimited that their edge there is always on a radius of the Base plate 3 lie.
  • the depth of the recess 41 and thereby also the thickness of the silicone bed 35 depend on the type of pump and the medium to be pumped.
  • the silicone bed 35 expediently protrudes from the annular surface 5 of the base plate 3 so that the the pressure transmission members 14 pressed down membrane 11 not at the edges of the Well 41 can be damaged. Surprisingly, this silicone bed prevents 35 a solidification and separation of a dispersion to be pumped during the pumping process.
  • a ring of plungers 14 is arranged, which as Serve pressure transmission members.
  • the plungers 14 are T-shaped in longitudinal section parallel to the axis 4 and are arranged along the entire pump channel 12 which the Connects inlet 13 to outlet 15, but not over that section of membrane 11, which leads in the direction of rotation of the rotor 2 from the outlet 15 to the inlet 13, because there the Pump channel 12 interrupted by the elevation 39 provided on the annular base plate 3 is.
  • the plungers 14 are arranged in the hold-down device 6 and parallel to the axis 4 secured by an adjusting ring 17 which counteracts the restoring force of the membrane 11 in Direction of the axis 4 is displaceable by means of an eccentric 19, so that the plunger 14 is one variable end stop, which allows the maximum cross section of the To reduce pump channel 12 and thus adjust the delivery rate of the pump.
  • the rotor 2 rotates about a shaft 20 which is in a roller bearing 26 in the hold-down device 6 and is mounted in a further roller bearing 27 in the rear housing part.
  • the rotor 2 has at least two idler rollers 21 - besides idler rollers 21 are driven as well Rolls conceivable - which roll over the plunger 14 and press it down, whereby the membrane 11 is pressed locally against the annular surface 5. This local pressure point wanders along the pump channel 12 with the rotor movement, pushes the one standing in front of it Amount of liquid through outlet 15 and simultaneously sucks through inlet 13 more liquid after.
  • the delivery pressure of the pump depends on the preload of the membrane 11. This bias depends on the material and the thickness of the membrane 11, but also on the size their bend. In addition, the delivery pressure depends on the force with which the plunger 14 act on the membrane 11. It can be changed by means of a second eccentric 22 which, via the rear roller bearing 27, onto a collar 28 on the shaft 20 acts and thereby a spring 29 more or less tensions, which on the axially displaceable Carrier 30 of the rollers 21 bears. By turning the eccentric 22 e.g. by means of of a handwheel attached to the outside, the force with which the rollers 21st act on the membrane 11, be increased or decreased. With excessive pressure build-up under the membrane 11, the plunger 14 can avoid the pressure, insofar as the pressure force which exceeds the resetting force of the spring 29, which is variable by rotating the eccentric 22.
  • the membrane 11 is braced by means of a threaded bolt 31, which in the hold-down device 6 is screwed in, extends through the clamping plate 24 and a nut 32 carries, which, when tightened, the clamping plate 24 against the base plate 3 and thus the base plate 3 presses against the edge of the membrane 11.
  • a threaded bolt 31 which in the hold-down device 6 is screwed in
  • a nut 32 carries, which, when tightened, the clamping plate 24 against the base plate 3 and thus the base plate 3 presses against the edge of the membrane 11.
  • the wear occurs primarily on the hard Base plate 3, or on the soft silicone bed 35 and expresses itself due to the abrasion of the base plate 3, or the silicone bed 35 in an enlargement of the pump channel 12, the in turn leads to a reduction in the delivery pressure. At the drop in the delivery pressure it is therefore easy to see when an exchange is required.
  • the pump channel 12 can also be formed by a hose be clamped between hold-down device 6 and clamping plate 24 and the entire area covered by the plungers 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Display Devices Of Pinball Game Machines (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

A rotary positive displacement pump comprises a stator (1) with a clamping plate (6) and a base plate (3) with an annular surface (5) on the clamping plate (6)-facing side. A membrane (11) covering the annular surface (5) is held between the clamping plate (6) and base plate (3) and forms a pumping channel (12) extending from an inlet (13) to an outlet (15) between the membrane (11) and base plate (3). A powered rotor (2) running around the concentric axis (4) of the annular surface (5) has at least one roller (21) running around the rear face of a circle of individual pressure transfer elements (14) which press the membrane (11) onto the annular surface to progressively interrupt the path from inlet (13) to outlet (15). The annular surface (5) is a layer of a softer material than the base plate (3). Preferably, the soft material layer (5) is a silicone polymer with a 20-50 Shore hardness extending over the area covered by the pressure transfer elements (14) and is either cast, vulcanised or bonded into a recess in the base plate (3) so that it projects above the recess edges. The base plate (3) is made of a dimensionally stable plastic and is held between the fixed clamping plate (6) and a removable clamping plate (24).

Description

Die Erfindung betrifft eine Rotationsverdrängerpumpe nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a rotary displacement pump according to the preamble of the claim 1.

Aus der DE-U-296 09 865 ist eine Rotationsverdrängerpumpe bestehend aus einem Stator und einem Rotor der eingangs angegebenen Art bekannt. Der Stator weist eine Ringfläche mit Zulauf und Ablauf auf, welche von einer Membran zur Ausbildung eines Pumpkanals überdeckt ist. Auf der Membran befindet sich ein Kranz von einzeln gegen die Membran beweglichen Druckübertragungsglieder in Form von Stößeln, welche aus hochkant stehenden Plattenelementen gebildet sind. Weiterhin ist ein Rotor vorgesehen, welcher die konzentrische Achse der Ringfläche umläuft. Dieser Rotor weist Rollen auf, welche auf der Oberseite der Druckübertragungsglieder laufen und dadurch die Membran fortlaufend lokal gegen die Ringfläche drücken, so daß die Membran den Weg vom Zulauf zum Ablauf fortschreitend unterbricht und das Pumpmaterial vor sich her schiebt. - Es gibt jedoch kritische Pumpmedien, die bei einem Fördern durch eine derartige Pumpe verklumpen. Zu den kritischen Pumpmedien gehören beispielsweise Dispersionen für Strukturputze, Effekt-Farben (Farbdispersionen, welche schuppenförmige Pigmente, Plättchen oder Schnitzel enthalten) und faserige Dispersionen (z.B. Baumwollfasern in Dispersion zur Bildung von "flüssigen Tapeten"). Durch Verklumpen werden die Dispersionen unbrauchbar. From DE-U-296 09 865 is a rotary displacement pump consisting of a stator and a rotor of the type specified at the outset. The stator has an annular surface with inlet and outlet on which by a membrane to form a pump channel is covered. On the membrane is a ring of individually movable against the membrane Pressure transmission elements in the form of plungers, which are made of upright Plate elements are formed. Furthermore, a rotor is provided, which concentric Axis of the ring surface revolves. This rotor has rollers on the top of the pressure transmission members and thereby continuously locally against the membrane Press the ring surface so that the membrane progresses from the inlet to the outlet interrupts and pushes the pump material in front of it. - However, there are critical pump media, which clump together when conveyed by such a pump. To the critical Pump media include, for example, dispersions for structural plasters, effect paints (Color dispersions containing scale-like pigments, flakes or cutlets) and fibrous dispersions (e.g. cotton fibers in dispersion to form "liquid Wallpaper "). The dispersions become unusable due to clumping.

Die DE-A-35 42 454 offenbart eine Membran-Rotationspumpe. Dabei ist zwischen der Membran und dem Gehäuse auf der inneren Laufbahn eine Gummieinlage angeordnet. Der Vorteil dieser Gummieinlage soll darin bestehen, daß zum einen eine besonders günstige Dichtung insbesondere bei körnigen Materialien erzielbar ist und daß andererseits aufgrund der höheren Elastizität eine längere Lebensdauer bei größerem Leiselauf erreichbar ist.DE-A-35 42 454 discloses a diaphragm rotary pump. It is between the membrane and a rubber insert is arranged on the housing on the inner raceway. The advantage This rubber insert should consist in that, on the one hand, a particularly favorable one Seal can be achieved especially with granular materials and that on the other hand because the higher elasticity, a longer service life can be achieved with greater silence.

Der Erfindung liegt die Aufgabe zugrunde, die Neigung zur Verklumpung bei kritischen Pumpmedien beim Fördern durch eine Rotationsverdrängerpumpe der eingangs angegebenen Art herabzusetzen.The invention has for its object to reduce the tendency to clump in critical pumping media when pumping through a rotary displacement pump of the type specified.

Die technische Lösung ist gekennzeichnet durch die Merkmale im Kennzeichen des Patentanspruchs 1.The technical solution is characterized by the features in the characterizing part of patent claim 1.

Indem die Ringfläche längs des Pumpkanals durch ein weicheres Material als das Material der Grundplatte gebildet ist, kann überraschenderweise verhindert werden, daß kritische Pumpmedien verklumpen oder sich noch in der Pumpe verfestigen. Indem dieses weichere Material in eine Vertiefung der Grundplatte eingebracht ist, gibt diese Vertiefung dem Material seitlichen Halt, und der Verschleiß an ihm wird dadurch beim Herunterdrücken der Druckübertragungsglieder gemindert. Indem weiterhin das weichere Material über die Vertiefung heraussteht, kann die Membran nicht gegen eine frei herausstehende Oberkante der Vertiefung gedrückt und dabei beschädigt werden.By making the ring surface along the pump channel through a softer material than the material the base plate is formed, can be surprisingly prevented that critical Pump media clump or solidify in the pump. By making this softer Material is introduced into a recess in the base plate, this recess gives the material lateral hold, and the wear on it is thereby when pressing down Pressure transmission links reduced. By continuing the softer material over the recess protrudes, the membrane can not against a freely protruding upper edge of the Depression and be damaged in the process.

Zweckmässigerweise erstreckt sich die Lage aus dem weicherem Material gemäß der Weiterbildung in Anspruch 2 nur über denjenigen Bereich, der von den Druckübertragungsgliedern überdeckt ist. Das genügt für eine optimale Wirksamkeit.The layer expediently extends from the softer material in accordance with the development in claim 2 only over that area of the pressure transmission members is covered. That is enough for optimal effectiveness.

Der Vorteil der Weiterbildung gemäß Anspruch 3 besteht darin, dass zwischen die Lage und die Grundplatte kein Pumpmedium gelangen kann und sich dort ablagert.The advantage of the training according to claim 3 is that between the location and the base plate cannot get any pump medium and is deposited there.

Silikone eignen sich gemäß der Weiterbildung in Anspruch 4 als weicheres Material.Silicones are suitable according to the further development in claim 4 as a softer material.

Sie können in verschiedenen Härtegraden hergestellt werden. Härten von 20 bis 50 Shore haben sich gemäß der Weiterbildung in Anspruch 5 für das weichere Material besonders bewährt.They can be manufactured in different degrees of hardness. Hardness from 20 to 50 Shore have according to the training in claim 5 especially for the softer material proven.

Eine weitere Senkung der Kosten - und gleichzeitig eine Gewichtsersparnis - bringt die Ausführung der Grundplatte in Kunststoff gemäß der Weiterbildung in Anspruch 6. Dabei ist ein formstabiler Kunststoff nötig, der den auftretenden Kräften widersteht, ohne dabei beschädigt zu werden. Als formstabile Kunststoffe eignen sich besonders: Polyamid, ABS-Polymere und Polystyrol.A further reduction in costs - and at the same time a weight saving - brings the Execution of the base plate in plastic according to the development in claim 6 a dimensionally stable plastic is required that can withstand the forces that occur without being damaged to become. The following are particularly suitable as dimensionally stable plastics: polyamide, ABS polymers and polystyrene.

Weitere Vorteile der Erfindung ergeben sich aus dem in den beigefügten Zeichnungen dargestellten Ausführungsbeispiel. Es zeigt:

Figur 1
einen Längsschnitt durch eine erfindungsgemässe Pumpe entlang der Linie B-B in Figur 2,
Figur 2
eine Draufsicht auf eine Grundplatte und
Figur 3
einen vergrössert dargestellten Qürschnitt durch die Grundplatte entlang der Linie A-A in Figur 2.
Further advantages of the invention result from the embodiment shown in the accompanying drawings. It shows:
Figure 1
3 shows a longitudinal section through a pump according to the invention along the line BB in FIG. 2,
Figure 2
a top view of a base plate and
Figure 3
3 shows an enlarged cross section through the base plate along the line AA in FIG. 2.

Die Pumpe hat einen Stator 1 und einen Rotor 2. Der Stator 1 ist ein Teil des Gehäuses der Pumpe und weist eine Spannplatte 24, einen Niederhalter 6, eine Grundplatte 3 und eine Membran 11 auf. Die Grundplatte 3 ist ringförmig ausgebildet und koaxial zur Achse 4 des Rotors 2 angeordnet. Die Grundplatte 3 hat eine ebene Ringfläche 5, welche begrenzt wird durch zwei konische Klemmflächen 9 und 10, welche vom Rotor 2 aus gesehen hinter der Ringfläche 5 liegen; ihnen liegen zwei weitere Klemmflächen 7 und 8 gegenüber, die am Niederhalter 6 ausgebildet sind und mit den Klemmflächen 9 und 10 zusammenwirken, um dazwischen die Membran 11 einzuklemmen, welche aus einem elastomeren Werkstoff besteht, in entspanntem, nicht eingebautem Zustand ein ringförmiges, ebenes Gebilde ist und durch das Einspannen zwischen den konischen Klemmflächen 7 bis 10 gebogen wird, so dass sie die ebene Ringfläche 5 überwölbt. Zwischen der gewölbten und dadurch elastisch vorgespannten Membran 11 und der Ringfläche 5 ist auf diese Weise ein Pumpkanal 12 gebildet, in welchen ein Zulauf 13 und ein Ablauf 15, welcher zweckmässigerweise dicht neben dem Zulauf 13 liegt, münden und - nur um ihn darstellen zu können - in Figur 1 in diagonaler Anordnung vorgesehen ist. Der Pumpkanal 12 ist auf dem kurzen Weg vom Zulauf 13 zum Ablauf 15 durch jeweils eine Erhebung 39 auf der ringförmigen Grundplatte 3 blockiert, indem die Erhebungen 39 in ihrem senkrecht zur Grundplatte 3 gelegten Radialschnitt kreissegmentförmig ausgebildet sind. Die beiden Erhebungen 39 sind radial auf der Ringfläche 5 der Grundplatte 3 angeordnet. Durch sie wird verhindert, dass das Pumpmedium in den Bereich eindringen kann, der in Drehrichtung des Rotors 2 zwischen Ablauf 15 und Zulauf 13 liegt.The pump has a stator 1 and a rotor 2. The stator 1 is part of the housing of the Pump and has a clamping plate 24, a hold-down 6, a base plate 3 and one Membrane 11 on. The base plate 3 is annular and coaxial to the axis 4 of the Rotor 2 arranged. The base plate 3 has a flat ring surface 5, which is limited by two conical clamping surfaces 9 and 10, which seen from the rotor 2 behind the Ring surface 5; they are opposite two further clamping surfaces 7 and 8, which on Hold-down devices 6 are formed and cooperate with the clamping surfaces 9 and 10 to clamp in between the membrane 11, which consists of an elastomeric material, is a ring-shaped, flat structure in a relaxed, non-installed state and is bent by clamping between the conical clamping surfaces 7 to 10, so that it arches the flat ring surface 5. Between the arched and therefore elastic biased membrane 11 and the annular surface 5 is a pump channel 12 in this way formed in which an inlet 13 and an outlet 15, which expediently tight is located next to the inlet 13, and - just to be able to represent it - in Figure 1 in diagonal arrangement is provided. The pump channel 12 is on the short path from the inlet 13 to the drain 15 by a survey 39 on the annular base plate 3 blocked by the elevations 39 in their radial section perpendicular to the base plate 3 are circular segment shaped. The two elevations 39 are radial on the Annular surface 5 of the base plate 3 is arranged. It prevents the pumping medium can penetrate into the area in the direction of rotation of the rotor 2 between outlet 15 and inlet 13 is.

In einer in der Ringfläche 5 vorhandenen Vertiefung 41, ist ein Füllmaterial eingebracht. Die Vertiefung 41 erstreckt sich annähernd entlang des gesamten Pumpkanals 12 vom Zulauf 13 bis zum Ablauf 15. Vorzugsweise verwendet man als Füllmaterial ein einstückiges Silikonbett 35. Die Vertiefung 41 ist zweckmässigerweise rechteckig im Querschnitt, genauso wie das Silikonbett 35, welches passgenau in die Vertiefung 41 eingesetzt ist. Die Vertiefung 41 und das in ihr liegende Silikonbett 35 sind an ihren dem Zu- bzw. Ablauf 13, 15 zugewandten Enden so begrenzt, dass sie mit ihrem dortigen Rand jeweils auf einem Radius der Grundplatte 3 liegen. Die Tiefe der Vertiefung 41 und dadurch auch die Dicke des Silikonbetts 35 hängen vom Pumpentyp und von dem zu pumpendem Medium ab. Das Silikonbett 35 steht zweckmässigerweise über die Ringfläche 5 der Grundplatte 3 heraus, damit die von den Druckübertragungsgliedern 14 herabgedrückte Membran 11 nicht an den Kanten der Vertiefung 41 beschädigt werden kann. Überraschenderweise verhindert dieses Silikonbett 35 eine Verfestigung und eine Entmischung einer zu pumpenden Dispersion beim Pumpvorgang.A filler material is introduced into an indentation 41 in the annular surface 5. The Recess 41 extends approximately along the entire pump channel 12 from the inlet 13 to the drain 15. Preferably, a one-piece silicone bed is used as the filling material 35. The recess 41 is expediently rectangular in cross section, just as like the silicone bed 35, which is inserted precisely into the recess 41. The deepening 41 and the silicone bed 35 lying in it are facing the inlet or outlet 13, 15 Ends so delimited that their edge there is always on a radius of the Base plate 3 lie. The depth of the recess 41 and thereby also the thickness of the silicone bed 35 depend on the type of pump and the medium to be pumped. The silicone bed 35 expediently protrudes from the annular surface 5 of the base plate 3 so that the the pressure transmission members 14 pressed down membrane 11 not at the edges of the Well 41 can be damaged. Surprisingly, this silicone bed prevents 35 a solidification and separation of a dispersion to be pumped during the pumping process.

Auf der Aussenseite der Membran 11 ist ein Kranz von Stösseln 14 angeordnet, welche als Druckübertragungsglieder dienen. Die Stössel 14 sind im Längsschnitt T-förmig, erstrecken sich parallel zur Achse 4 und sind längs des gesamten Pumpkanals 12 angeordnet, der den Zulauf 13 mit dem Ablauf 15 verbindet, nicht aber über jenem Abschnitt der Membran 11, welcher in Drehrichtung des Rotors 2 vom Ablauf 15 zum Zulauf 13 führt, weil dort der Pumpkanal 12 durch die auf der ringförmigen Grundplatte 3 vorgesehene Erhebung 39 unterbrochen ist.On the outside of the membrane 11, a ring of plungers 14 is arranged, which as Serve pressure transmission members. The plungers 14 are T-shaped in longitudinal section parallel to the axis 4 and are arranged along the entire pump channel 12 which the Connects inlet 13 to outlet 15, but not over that section of membrane 11, which leads in the direction of rotation of the rotor 2 from the outlet 15 to the inlet 13, because there the Pump channel 12 interrupted by the elevation 39 provided on the annular base plate 3 is.

Die Stössel 14 sind im Niederhalter 6 parallel zur Achse 4 verschieblich angeordnet und durch einen Stellring 17 gesichert, welcher gegen die Rückstellkraft der Membran 11 in Richtung der Achse 4 mittels eines Exzenters 19 verlagerbar ist, so dass die Stössel 14 einen veränderlichen Endanschlag haben, der es gestattet, den maximalen Qürschnitt des Pumpkanals 12 zu verringern und damit die Förderleistung der Pumpe einzustellen.The plungers 14 are arranged in the hold-down device 6 and parallel to the axis 4 secured by an adjusting ring 17 which counteracts the restoring force of the membrane 11 in Direction of the axis 4 is displaceable by means of an eccentric 19, so that the plunger 14 is one variable end stop, which allows the maximum cross section of the To reduce pump channel 12 and thus adjust the delivery rate of the pump.

Der Rotor 2 dreht sich um eine Welle 20, welche in einem Wälzlager 26 im Niederhalter 6 und in einem weiteren Wälzlager 27 im hinteren Gehäuseteil gelagert ist. Der Rotor 2 hat wenigstens zwei freilaufende Rollen 21 - neben freilaufenden Rollen 21 sind genauso angetriebene Rollen denkbar - welche über die Stössel 14 hinwegrollen und sie niederdrücken, wodurch die Membran 11 lokal an die Ringfläche 5 gedrückt wird. Diese lokale Andrückstelle wandert mit der Rotorbewegung längs des Pumpkanals 12, schiebt die davor stehende Flüssigkeitsmenge durch den Ablauf 15 hinaus und saugt gleichzeitig durch den Zulauf 13 weitere Flüssigkeit nach.The rotor 2 rotates about a shaft 20 which is in a roller bearing 26 in the hold-down device 6 and is mounted in a further roller bearing 27 in the rear housing part. The rotor 2 has at least two idler rollers 21 - besides idler rollers 21 are driven as well Rolls conceivable - which roll over the plunger 14 and press it down, whereby the membrane 11 is pressed locally against the annular surface 5. This local pressure point wanders along the pump channel 12 with the rotor movement, pushes the one standing in front of it Amount of liquid through outlet 15 and simultaneously sucks through inlet 13 more liquid after.

Der Förderdruck der Pumpe hängt von der Vorspannung der Membran 11 ab. Diese Vorspannung hängt vom Material und der Dicke der Membran 11 ab, aber auch vom Ausmass ihrer Biegung. Darüberhinaus hängt der Förderdruck von der Kraft ab, mit welcher die Stössel 14 auf die Membran 11 einwirken. Sie kann mittels eines zweiten Exzenters 22 verändert werden, welcher über das hintere Wälzlager 27 auf einen Kragen 28 an der Welle 20 einwirkt und dadurch eine Feder 29 mehr oder weniger spannt, welche auf dem axial verschieblichen Träger 30 der Rollen 21 lastet. Durch Verdrehen des Exzenters 22 z.B. mittels eines an der Aussenseite angebrachten Handrades kann die Kraft, mit welcher die Rollen 21 auf die Membran 11 einwirken, erhöht oder erniedrigt werden. Bei exzessivem Druckaufbau unter der Membran 11 können die Stössel 14 dem Druck ausweichen, soweit die Druckkraft die durch Verdrehen des Exzenters 22 veränderliche Rückstellkraft der Feder 29 übersteigt.The delivery pressure of the pump depends on the preload of the membrane 11. This bias depends on the material and the thickness of the membrane 11, but also on the size their bend. In addition, the delivery pressure depends on the force with which the plunger 14 act on the membrane 11. It can be changed by means of a second eccentric 22 which, via the rear roller bearing 27, onto a collar 28 on the shaft 20 acts and thereby a spring 29 more or less tensions, which on the axially displaceable Carrier 30 of the rollers 21 bears. By turning the eccentric 22 e.g. by means of of a handwheel attached to the outside, the force with which the rollers 21st act on the membrane 11, be increased or decreased. With excessive pressure build-up under the membrane 11, the plunger 14 can avoid the pressure, insofar as the pressure force which exceeds the resetting force of the spring 29, which is variable by rotating the eccentric 22.

Die Verspannung der Membran 11 geschieht mittels eines Gewindebolzens 31, welcher in den Niederhalter 6 eingedreht ist, sich durch die Spannplatte 24 erstreckt und eine Mutter 32 trägt, die, wenn sie angezogen wird, die Spannplatte 24 gegen die Grundplatte 3 und damit die Grundplatte 3 gegen den Rand der Membran 11 drückt. Ebenso besteht die Möglichkeit zur Verspannung der Membran 11 statt der Mutter 32 auf einen Schnellspannverschluss zurückzugreifen. Damit werden die Membran 11 und die Grundplatte 3 eingespannt und gleichzeitig der Pumpkanal 12 abgedichtet. Falls bei einem Verschleiss die Membran 11 und/oder die Grundplatte 3 ausgetauscht werden müssen, muss lediglich die Mutter 32 gelöst werden. Danach kann die Spannplatte 24 abgenommen werden und die Grundplatte 3 und die Membran 11 sind frei zugänglich. Der Verschleiss tritt in erster Linie an der harten Grundplatte 3, bzw. am weichen Silikonbett 35 auf und äussert sich infolge des Abriebs von der Grundplatte 3, bzw. des Silikonbetts 35 in einer Vergrösserung des Pumpkanals 12, die ihrerseits eine Verringerung des Förderdrucks nach sich zieht. Am Absinken des Förderdrucks kann man daher leicht erkennen, wann ein Austausch erforderlich ist.The membrane 11 is braced by means of a threaded bolt 31, which in the hold-down device 6 is screwed in, extends through the clamping plate 24 and a nut 32 carries, which, when tightened, the clamping plate 24 against the base plate 3 and thus the base plate 3 presses against the edge of the membrane 11. There is also the possibility to clamp the membrane 11 instead of the nut 32 on a quick-release fastener recourse. So that the membrane 11 and the base plate 3 are clamped and at the same time the pump channel 12 is sealed. If membrane 11 is worn out and / or the base plate 3 have to be replaced, only the nut 32 has to be loosened become. The clamping plate 24 can then be removed and the base plate 3 and the membrane 11 are freely accessible. The wear occurs primarily on the hard Base plate 3, or on the soft silicone bed 35 and expresses itself due to the abrasion of the base plate 3, or the silicone bed 35 in an enlargement of the pump channel 12, the in turn leads to a reduction in the delivery pressure. At the drop in the delivery pressure it is therefore easy to see when an exchange is required.

Neben der Ausbildung des Pumpkanals 12 durch eine die Ringfläche 5 der Grundplatte 3 überspannende Membran 11, kann der Pumpkanal 12 auch durch einen Schlauch gebildet werden, der zwischen Niederhalter 6 und Spannplatte 24 eingespannt ist und den gesamten, von den Stösseln 14 überdeckten Bereich bedeckt.In addition to the formation of the pump channel 12 through an annular surface 5 of the base plate 3 spanning membrane 11, the pump channel 12 can also be formed by a hose be clamped between hold-down device 6 and clamping plate 24 and the entire area covered by the plungers 14.

Claims (6)

  1. Rotary displacement pump with a stator (1) having a base plate (3) with a ring surface (5), where the ring surface (5) extends at least over part of a full circle, where further a supply (13) opens into the ring surface (5) and a discharge (15) departs from the ring surface (5), where further the ring surface (5) is covered by a membrane (11) to form a pump channel (12) and where finally a crown of pressure transfer elements (14) which are individually movable against the membrane (11) and ring surface (5), and in particular made of upright plate elements, is provided, and with a rotor (2) arranged over the pressure transfer elements (14) and rotating about the concentric axis (4) of the ring surface (5), where the rotor (2) has at least one roller (21) which runs on the back of the pressure transfer elements (14) and as a result presses the membrane (11) continuously locally against the ring surface (5) such that the membrane (11) progressively interrupts the path from the supply (13) to the discharge (15) and pushes the pumped material before it, characterised in that in the base plate (3) along the pump channel (12) is formed a recess (41), in that in this recess (41) to form the ring surface (5) lies a material (35) which is softer than the material of the base plate (3), and in that the material (35) protrudes over the recess (41).
  2. Rotary displacement pump according to the previous claim, characterised in that the softer material (35) extends over the area covered by the pressure transfer elements (14).
  3. Rotary displacement pump according to any of the previous claims, characterised in that the softer material (35) is cast, vulcanised or glued to the base plate (3).
  4. Rotary displacement pump according to any of the previous claims, characterised in that the softer material (35) is a silicon.
  5. Rotary displacement pump according to any of the previous claims, characterised in that the softer material (35) lies in the hardness range of 20 to 50 Shore.
  6. Rotary displacement pump according to any of the previous claims, characterised in that the base plate (3) is made of dimensionally stable plastic.
EP98107092A 1997-04-25 1998-04-18 Rotary positive displacement pump Expired - Lifetime EP0874157B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29707480U 1997-04-25
DE29707480U DE29707480U1 (en) 1997-04-25 1997-04-25 Rotary displacement pump

Publications (3)

Publication Number Publication Date
EP0874157A2 EP0874157A2 (en) 1998-10-28
EP0874157A3 EP0874157A3 (en) 1999-04-28
EP0874157B1 true EP0874157B1 (en) 2002-12-18

Family

ID=8039528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107092A Expired - Lifetime EP0874157B1 (en) 1997-04-25 1998-04-18 Rotary positive displacement pump

Country Status (3)

Country Link
EP (1) EP0874157B1 (en)
AT (1) ATE230069T1 (en)
DE (2) DE29707480U1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1082625C (en) * 1999-07-07 2002-04-10 张建辉 Piezoelectric ceramic pamp with three-way type inlet and outlet

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722893A (en) * 1950-01-17 1955-11-08 Maillot Leon Alfred Collapsible chamber pump
DE3542454A1 (en) * 1985-11-30 1987-06-04 Walter Swoboda Diaphragm rotary pump
DE29511966U1 (en) * 1994-09-17 1995-09-28 Kammerer, Rolf, 75196 Remchingen Rotary displacement pump
DE29609865U1 (en) * 1996-06-04 1996-10-24 Kammerer, Rolf, 75196 Remchingen Rotary displacement pump

Also Published As

Publication number Publication date
DE29707480U1 (en) 1997-07-17
ATE230069T1 (en) 2003-01-15
DE59806668D1 (en) 2003-01-30
EP0874157A3 (en) 1999-04-28
EP0874157A2 (en) 1998-10-28

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