EP0223025B1 - Volumetric fluid pump working as a pump with rotary pistons - Google Patents

Volumetric fluid pump working as a pump with rotary pistons Download PDF

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Publication number
EP0223025B1
EP0223025B1 EP86113596A EP86113596A EP0223025B1 EP 0223025 B1 EP0223025 B1 EP 0223025B1 EP 86113596 A EP86113596 A EP 86113596A EP 86113596 A EP86113596 A EP 86113596A EP 0223025 B1 EP0223025 B1 EP 0223025B1
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EP
European Patent Office
Prior art keywords
housing
membrane
cavity
pump
longitudinal bore
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EP86113596A
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German (de)
French (fr)
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EP0223025A3 (en
EP0223025A2 (en
Inventor
Renato Vicentini
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Individual
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    • 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 volumetric pump for liquid or gaseous media acting in the manner of a rotary lobe pump, which has a motor-driven rotary lobe in a housing with inlet and outlet openings for the conveying medium, which is rotatably mounted in the housing bore around its longitudinal axis, the housing has the shape of a rigid, one-piece or multi-piece fitting with a cylindrical longitudinal bore, in which a tubular membrane is provided, which in the region of the two cylindrically shaped axial ends of the longitudinal bore of the housing is attached to the housing over the entire circumference in a liquid-tight and / or gas-tight manner is and between these two axial ends at a distance from the wall of the longitudinal bore, such that they are closed with this one space whose two circumferential ends are insulated from each other and that at these points the membrane over the entire axial length interruption loose and attached to the housing with a good seal; that two openings are provided in the area of the aforementioned circumferential ends, which bring the intermediate space into connection
  • the housing has the shape of a rigid, one-piece or multi-piece, e.g. has a tubular fitting with a cylindrical longitudinal bore in which a tubular or e.g. band-shaped but tubular membrane is provided, which is attached in the region of the two cylindrically shaped axial ends of the longitudinal bore of the housing to the liquid and / or gas-tight over the entire circumference and runs between these two aixal ends at a distance from the wall of the longitudinal bore in such a way that it forms an intermediate space in the form of a ring which is not closed in itself, the two circumferential ends of which are closed and insulated from one another in such a way that the membrane is attached to the housing without interruption and with a good seal over the entire axial length,
  • two openings are provided in the area of the aforementioned circumferential ends, which connect the intermediate space with the medium inflow or outflow and can form the suction opening or the discharge opening, the interior of the unit consisting of housing, membrane and intermediate space and in
  • Known pumps of this type are e.g. from CH-PS 331 944, which shows an arrangement that is quite complicated in structure and consequently very susceptible to failure, and from DE-OS 2 702 123 become known, the so-called radial ball diaphragm pump used to convey toxic or aggressive media with the features of the preamble of claim 1. shows, the structure of which is also relatively complicated and which can cause problems when starting.
  • the aim of the invention is to remedy this situation and to create a pump of the simplest construction in question here, in which the start-up can also proceed without problems regardless of the respective dimensions and when idling.
  • the new arrangement according to the invention provides that the tubular or e.g. band-shaped, but tubular membrane laid around with the wall of the longitudinal bore of the housing forms an intermediate space in the form of a ring which is not closed in itself and that the shaped pieces are arranged in such a way that they act as a weight back and forth in the recesses during the course of their rotational movement in the radial direction are slidably movable in such a way that they can be moved back and forth in the radial direction between a retracted inner position and under the action of the centrifugal force, in which they press the membrane against the wall of the housing bore.
  • the tubular or e.g. band-shaped, but tubular membrane laid around with the wall of the longitudinal bore of the housing forms an intermediate space in the form of a ring which is not closed in itself and that the shaped pieces are arranged in such a way that they act as a weight back and forth in the recesses during the course of their rotational movement in the radial direction are
  • the present invention thus relates to a volumetric pump which has no limits with regard to its dimensions, but the application of the invention is particularly advantageous for the small and smallest pumps which often have problems when starting up and which make motors necessary to avoid these problems, which are appropriately oversized.
  • all volumetric pumps are manufactured in such a way that the motor is in the start-up state under load since the pumping cavities move directly from the motor and the friction to be overcome during start-up or the corresponding torque, especially in small machines, is often greater than the torque that the motor can deliver as a result of random external factors.
  • the motor starts idling, as will be seen from the following description, only with the increase in speed the pumping action is started.
  • the pump would operate idle, reaching a speed even greater than the operating speed, thereby promoting fluid crumbling and pump reactivation.
  • the smallest and smallest pumps are used in applications that require fast and irregular work, many are also used in environmental conditions that are extremely variable, with dust, moisture, corrosive media, etc. in the Medium may be present, they also often have to work at temperatures that are very variable, which is why start-up could also be critical. For example, very low temperatures can freeze the moisture contained in the medium, which has condensed at certain points in the pump, thereby jeopardizing the start-up, even if this was only temporary.
  • the known pumps all have more or less the above-mentioned problems with regard to their function and mode of operation, for example the gear pumps, the capsule pumps, the vane pumps, the piston pumps, etc.
  • pumps whose pumping element has a flexible tube or tube between the suction mouth and drain mouth which is very soft and pliable and which is pinched together by a rotating triangular prism, being divided into small chambers filled with liquid which is in motion between the suction mouth and the drain mouth.
  • This latter pump is very simple and economical and widespread, but this pump also does not solve the problem of starting under load, the pumping tube or tube also being heavily stressed and consequently subject to rapid wear and aging.
  • the pump according to the invention solves the problems which exist in the conventional volumetric pumps, since the fluid is separated and isolated from the parts in rotation, since it is still possible to start the motor at idle without any problems and, finally, because The stress on the membrane required for pumping is minimal while still having a degree of sealing between the pumping chambers that is larger than the tube or tubing pump described above.
  • the motor is designated 10, the direction of rotation is indicated by the arrow 11; 2 is the rotor, which carries two spherical or spherical masses 22, 23 in the recesses 20 and 21, the above information being used only as an example and should in no way be limiting, neither in terms of the number nor in terms of the shape of the masses.
  • the two masses can move freely and slide in the recesses 20 and 21 and take any position that lies between the axes 24 and 25 for the mass 22 and 26 and 27 for the mass 23.
  • Positions 24 and 26 are taken when the pump is stopped, positions 25 and 27 are taken when the motor is running and the pump is working and consequently the membrane 4 deforms until it bears against the bottom of the channel 54.
  • the drawing shows, by way of example only, an embodiment of the pump according to the invention, in which the rigid body 5 consists of two identical halves: half 50 and half 51, against which the membrane 4 is pressed from the inside; in this constructive solution it does not have to be that the membrane has a tubular shape, but it can simply consist of a band, of a suitable elastomer, the height of which is designated 41 and which is wound on two rings 60 and 61, which are separated by the Projection or projection 62 are connected to form a single piece, and which together form the piece 6 for holding the membrane.
  • the projection or projection 62 serves to hold the legs of the band 42 and 43 (FIG. 1) and to isolate and close the circumferential ends 30 and 31 of the annular space.
  • the two halves 50 and 51 are firmly connected to each other around the element 6 and aligned and fastened to one another by means of bores and corresponding pins or pins 59, and are held by means of the formations 55 and 56 of the body 5 and the corresponding counterparts 63 and 64 the membrane 4 tight.
  • the approach or lead 62 carries the thickening 65 or a corresponding shaped piece in order to better hold the legs of the band 4.
  • the halves or half-shells 50 and 51 of the housing 5 carry the connections 52 and 53 for the medium lines, which are oriented and aligned parallel to the ZZ axis in order to facilitate the pressing of the aforementioned half-shells, but the connections can also be oriented or fitted differently can.
  • 7 is the lid with the holder 71 for the rotor; 57 and 58 are the grooves for holding the cover 7 and the motor 1.
  • the annular space 3 is divided into three separate, mutually insulated chambers, of which the chamber 32 from the end 30 to the ball 22 goes, the chamber 33 extends from the ball 22 to the ball 23 and the chamber 34 goes from the ball 23 to the end 31.
  • the chamber 32 becomes larger and, consequently, because the membrane 4 tends to return to the rest position due to its elasticity, the liquid, the fluid, is sucked in by the connection 52 in the direction of the arrow 35.
  • the chamber 33 does not change its volume since the relative position of the two balls 22 and 23 is fixed relative to one another, but it moves forward in the sense of the movement.
  • the chamber 34 becomes smaller and smaller because the mass 23 is flowing in front, and as a result the fluid is expelled in the direction of the arrows 36. If the ball 23 exceeds the connection 53, the fluid or medium contained in the chamber 33 will reach the outlet opening 36; then the ball 23 moves in the direction of the suction opening 32, an identical cycle as that of the ball 22 follows. When the rotational movement is reversed, the function of the pump is reversed, that is to say the opening 53 becomes the suction opening and the opening 52 the discharge or discharge opening.
  • the criteria regarding the dimensioning of this pump are simple because the medium transported depends on the number of revolutions times the volume of the annular space minus the dead volume of the masses.
  • the pressure to which the pump can bring the medium is proportional to the square of the number of revolutions, and the exact value can be determined using the formula relating to the centrifugal force, taking into account that this is the product of the pressure must counteract the fluid and the surface of the ball associated with the drain opening without neglecting the angle of incidence.
  • the pump according to the invention can therefore be an advantageous device, which is composed of the pump and the pressure regulator, which works simply based on the speed. With the help of an electronic control with a closed ring, finely regulated pressures can be achieved in this way.
  • the body 5 may be in one piece and also have an inner surface that is smooth and has no channel; in this case the annular space may e.g.
  • the membrane 4 can be obtained by means of the membrane 4 which is stretched inside the housing or body 5 in such a way that it itself forms the annular space; the membrane can, moreover, be attached to the inside of the body or housing 5 by means of any other suitable system, apart from the arrangement described above using the body 6, and it can be attached directly to the suitable walls described above by gluing or vulcanizing; in this case the masses can be two small cylinders, the height of which is equal to or greater than the height of the annular space.

Description

Die Erfindung betrifft eine nach Art einer Drehkolbenpumpe wirkende volumetrische Pumpe für flüssige oder gasförmige Medien, die in einem Gehäuse mit Einlaß- und Auslaßöffnungen für das Fördermedium einen motorisch angetriebenen Drehkolben besitzt, der in der Gehäusebohrung um deren Längsachse herum drehbar gelagert ist, wobei das Gehäuse die Gestalt eines starren, ein- oder mehrstückigen Formstücks mit einer zylindrischen Längsbohrung besitzt, in der eine schlauchförmige Membran vorgesehen ist, die im Bereich der beiden zylindrisch geformten axialen Enden der Längsbohrung des Gehäuses an diesem über den gesamten Umfang flüssigkeits- und/oder gasdicht angebracht ist und zwischen diesen beiden axialen Enden in Abstand von der Wandung der Längsbohrung verläuft, derart, daß sie mit dieser einen Zwischenraum dessen beide Umfangsenden dadurch verschlossen und gegeneinander isoliert sind, daß an diesen Stellen die Membran über die gesamte axiale Länge unterbrechungslos und unter guter Abdichtung am Gehäuse befestigt ist; daß im Bereich der vorgenannten Umfangsenden zwei Öffnungen vorgesehen sind, die den Zwischenraum mit dem Mediumzufluß bzw. dem Mediumabfiuß in Verbindung bringen und hierbei die Ansaugöffnung bzw. die Ablaßöffnung bilden können; und daß im Inneren der aus Gehäuse, Membran und Zwischenraum bestehenden Einheit und in axial entsprechender Anordnung zu dem vorgenannten Zwischenraum zwei oder mehr Formstücke vorgesehen sind, die mit Hilfe eines Antriebsmotors als Einheit um die Längsmittelachse des Zwischenraums in Drehung versetzt werden können und die, wenn sie an der Membran anliegen und diese an die Wandung der Gehäusebohrung andrücken, an dieser Stelle einen dichten Abschluß des Zwischenraums bewirken und hierbei diesen in verschiedene Kammern unterteilen, wobei die auf diese Weise gebildeten Kammern eine kontinuierliche, von der Ansaugöffnung zur Ablaßöffnung fortschreitende Rotationsbewegung mit pumpender Wirkung ausführen.The invention relates to a volumetric pump for liquid or gaseous media acting in the manner of a rotary lobe pump, which has a motor-driven rotary lobe in a housing with inlet and outlet openings for the conveying medium, which is rotatably mounted in the housing bore around its longitudinal axis, the housing has the shape of a rigid, one-piece or multi-piece fitting with a cylindrical longitudinal bore, in which a tubular membrane is provided, which in the region of the two cylindrically shaped axial ends of the longitudinal bore of the housing is attached to the housing over the entire circumference in a liquid-tight and / or gas-tight manner is and between these two axial ends at a distance from the wall of the longitudinal bore, such that they are closed with this one space whose two circumferential ends are insulated from each other and that at these points the membrane over the entire axial length interruption loose and attached to the housing with a good seal; that two openings are provided in the area of the aforementioned circumferential ends, which bring the intermediate space into connection with the medium inflow or the medium outflow and can form the suction opening or the discharge opening; and that in the interior of the unit consisting of the housing, diaphragm and intermediate space and in an axially corresponding arrangement to the aforementioned intermediate space, two or more shaped pieces are provided, which can be set in rotation with the aid of a drive motor as a unit about the longitudinal central axis of the intermediate space, and which if they rest on the membrane and press it against the wall of the housing bore, at this point bring about a tight seal of the intermediate space and in doing so divide it into different chambers, the chambers formed in this way having a continuous, progressive rotational movement from the suction opening to the discharge opening with pumping Execute effect.

Es handelt sich also um eine Anordnung, bei der das Gehäuse die Gestalt eines starren, ein- oder mehrstückigen, z.B. rohrartigen Formstückes mit einer zylindrischen Längsbohrung besitzt, in der eine schlauchförmige oder z.B. bandförmige, aber schlauchförmig herumgelegte Membran vorgesehen ist, die im Bereich der beiden zylindrisch geformten axialen Enden der Längsbohrung des Gehäuses an diesem über den gesamten Umfang flüssigkeits- und/oder gasdicht angebracht ist und zwischen diesen beiden aixalen Enden in Abstand von der Wandung der Längsbohrung verläuft, derart, daß sie mit dieser einen Zwischenraum in Form eines in sich nicht geschlossenen Ringes bildet, dessen beide Umfangsenden dadurch verschlossen und gegeneinander isoliert sind, daß an diesen Stellen die Membran über die gesamte axiale Länge unterbrechungslos und unter guter Abdichtung am Gehäuse befestigt ist, hierbei sind im Bereich der vorgenannten Umfangsenden zwei Öffnungen vorgesehen, die den Zwischenraum mit dem Mediumzufluß bzw. dem Mediumabfluß in Verbindung bringen und hierbei die Ansaugöffnung bzw. die Ablaßöffnung bilden können, wobei im Inneren der aus Gehäuse, Membran und Zwischenraum bestehenden Einheit und in axial entsprechender Anordnung zu dem vorgenannten Zwischenraum zwei oder mehr Formstücke vorgesehen sind, die mit Hilfe eines Antriebsmotors als Einheit um die Längsmittelachse des Zwischenraumes in Drehung versetzt werden können und hierbei jeweils in radialer Richtung zwischen einer zurückgezogenen inneren Stellung und unter der Wirkung der Zentrifugalkraft einer äußersten Stellung hin und her verstellbar sind, in der sie an der Membran anliegen und diese an die Wandung der Gehäusebohrung so andrücken, daß sie an dieser Stelle einen dichten Abschluß des Zwischenraumes bewirken und hierbei diesen in verschiedene Kammern unterteilen, wobei die auf diese Weise gebildeten Kammern eine kontinuierliche, von der Ansaugöffnung zur Ablaßöffnung fortschreitende Rotationsbewegung mit pumpender Wirkung ausführen.It is therefore an arrangement in which the housing has the shape of a rigid, one-piece or multi-piece, e.g. has a tubular fitting with a cylindrical longitudinal bore in which a tubular or e.g. band-shaped but tubular membrane is provided, which is attached in the region of the two cylindrically shaped axial ends of the longitudinal bore of the housing to the liquid and / or gas-tight over the entire circumference and runs between these two aixal ends at a distance from the wall of the longitudinal bore in such a way that it forms an intermediate space in the form of a ring which is not closed in itself, the two circumferential ends of which are closed and insulated from one another in such a way that the membrane is attached to the housing without interruption and with a good seal over the entire axial length, Here, two openings are provided in the area of the aforementioned circumferential ends, which connect the intermediate space with the medium inflow or outflow and can form the suction opening or the discharge opening, the interior of the unit consisting of housing, membrane and intermediate space and in ax ial corresponding arrangement to the aforementioned space two or more fittings are provided, which can be set in rotation with the aid of a drive motor as a unit about the longitudinal central axis of the space and in each case in the radial direction between a retracted inner position and under the action of the centrifugal force of an outermost Position adjustable back and forth in which they rest on the membrane and press it against the wall of the housing bore so that they bring about a tight seal of the space at this point and divide it into different chambers, the chambers formed in this way Carry out a continuous rotational movement with a pumping effect, progressing from the suction opening to the discharge opening.

Bekannte Pumpen solcher Art sind z.B. aus der CH-PS 331 944, die eine Anordnung zeigt, die recht kompliziert im Aufbau und demzufolge sehr störanfällig ist, und aus der DE-OS 2 702 123 bekannt geworden, die eine zum Fördern von giftigen oder agressiven Medien dienende sogenannte Radial-Kugelmembranpumpe mit den Merkmalen des Oberbegriffs des Anspruchs 1 . zeigt, deren Aufbau ebenfalls relativ kompliziert ist und die beim Anlaufen Probleme ergeben kann. Ziel der Erfindung ist es, hier Abhilfe zu treffen und eine Pumpe der hier in Frage stehenden Art einfachster Konstruktion zu schaffen, bei der auch das Anlaufen unabhängig von den jeweiligen Abmessungen und im Leerlauf ohne Probleme vor sich gehen kann.Known pumps of this type are e.g. from CH-PS 331 944, which shows an arrangement that is quite complicated in structure and consequently very susceptible to failure, and from DE-OS 2 702 123 become known, the so-called radial ball diaphragm pump used to convey toxic or aggressive media with the features of the preamble of claim 1. shows, the structure of which is also relatively complicated and which can cause problems when starting. The aim of the invention is to remedy this situation and to create a pump of the simplest construction in question here, in which the start-up can also proceed without problems regardless of the respective dimensions and when idling.

Zu dem oben genannten Zweck ist bei der neuen Anordnung gemäß der Erfindung vorgesehen, daß die schlauchförmige oder z.B. bandförmige, aber schlauchförmig herumgelegte Membran mit der Wand der Längsbohrung des Gehäuses einen Zwischenraum in Form eines in sich nicht geschlossenen Ringes bildet und daß die Formstücke so angeordnet sind, daß sie im Verlauf ihrer Drehbewegung in radialer Richtung in den Ausnehmungen als Gewicht wirkend hin und her gleitend beweglich sind, derart, daß sie sich jeweils in radialer Richtung zwischen einer zurückgezogenen, inneren Stellung und unter Wirkung der Zentrifugalkraft einer äu- ßersten Stellung hin und her verstellbar sind, in der allein sie die Membran an die Wand der Gehäusebohrung andrücken.For the above-mentioned purpose, the new arrangement according to the invention provides that the tubular or e.g. band-shaped, but tubular membrane laid around with the wall of the longitudinal bore of the housing forms an intermediate space in the form of a ring which is not closed in itself and that the shaped pieces are arranged in such a way that they act as a weight back and forth in the recesses during the course of their rotational movement in the radial direction are slidably movable in such a way that they can be moved back and forth in the radial direction between a retracted inner position and under the action of the centrifugal force, in which they press the membrane against the wall of the housing bore.

Die vorliegende Erfindung bezieht sich also auf eine volumetrische Pumpe, die keine Grenzen hinsichtlich ihrer Abmessungen hat, wobei jedoch besonders vorteilhaft die Anwendung der Erfindung bei den kleinen und kleinsten Pumpen ist, die oft Probleme beim Anlaufen aufweisen und zur Vermeidung dieser Probleme Motoren notwendig machen, die in geeigneter Weise überdimensioniert sind. In der Tat werden alle volumetrischen Pumpen in solcher Weise hergestellt, daß der Motor sich in dem Zustand des Anlaufs unter Belastung befindet, da die pumpenden Höhlungen direkt vom Motor bewegt werden und die beim Anlaufen zu überwindende Reibung oder das entsprechende Moment insbesondere bei kleinen Maschinen oft größer als das Moment ist, das der Motor liefern kann als Folge von zufälligen äußeren Faktoren. Bei der Pumpe gemäß der Erfindung läuft der Motor, wie aus der folgenden Beschreibung zu erkennen sein wird, leer an, lediglich mit der Erhöhung der Geschwindigkeit wird die pumpende Wirkung in Gang gesetzt. Darüber hinaus würde im Falle, daß die Flüssigkeiten z.B. gefroren sein sollten, die Pumpe leer arbeiten, wobei sie eine Umdrehungszahl erreichen würde, die noch größer ist als die Betriebsdrehzahl, wobei auf diese Weise das Zerbröckeln des Fluids und die Reaktivierung der Pumpe begünstigt würden. Es ist in der Tat bekannt, daß die kleinen und kleinsten Pumpen in Anwendungsfällen eingesetzt werden, die schnelles und unregelmäßiges Arbeiten verlangen, sehr viele werden auch in Umgebungsbedingungen verwendet, die in extremer Weise variable sind, wobei Staub, Feuchtigkeit, korrosive Medien usw. im Medium vorhanden sein können, auch müssen sie oft bei Temperaturen arbeiten, die sehr veränderlich sind, weswegen das Anlaufen ebenfalls kritisch werden könnte. So z.B. können sehr niedrige Temperaturen die im Medium enthaltene Feuchtigkeit, die an gewissen Stellen der Pumpe kondensiert ist, zum Gefrieren bringen, wobei auf diese Weise das Anlaufen in Frage gestellt wird, selbst wenn dies nur zeitweilig sein sollte. Die bekannten Pumpen weisen alle mehr oder weniger stark die oben angeführten Probleme hinsichtlich der Funktion und Wirkungsweise auf, so z.B. die Zahnradpumpen, die Kapselpumpen, die Flügelpumpen, die Kolbenpumpen usw. Es gibt auch Pumpen, deren pumpendes Element ein flexibles Röhrchen oder Schläuchchen zwischen Ansaugmündung und Ablaßmündung ist, das sehr weich und schmiegsam ist und das von einem sich drehenden dreieckigen Prisma zusammengequetscht wird, wobei es in kleine Kammern unterteilt wird, die mit Flüssigkeit gefüllt sind, die sich in Bewegung zwichen der Ansaugmündung und der Ablaßmündung befindet. Diese letztere Pumpe ist sehr einfach und wirtschaftlich sowie weit verbreitet, jedoch löst auch diese Pumpe nicht das Problem des Anlaufens unter Belastung, wobei auch noch das pumpende Röhrchen oder Schläuchchen stark beansprucht ist und demzufolge einer schnellen Abnutzung und Alterung unterworfen ist. Wie bereits ausgeführt worden ist, löst die Pumpe gemäß der Erfindung die bei den herkömmlichen volumetrischen Pumpen vorhandenen Probleme, da das Fluid von den in Drehung befindlichen Teilen getrennt und isoliert ist, da weiterhin das Anlaufen des Motors im Leerlauf problemlos möglich ist und weil schließlich die Belastung der Membran, die für das Pumpen notwendig ist, minimal ist, wobei man trotzdem ein Ausmaß der Abdichtung zwischen den Pumpkammern hat, das größer als die oben beschriebene Pumpe mit Röhrchen oder Schläuchchen ist.The present invention thus relates to a volumetric pump which has no limits with regard to its dimensions, but the application of the invention is particularly advantageous for the small and smallest pumps which often have problems when starting up and which make motors necessary to avoid these problems, which are appropriately oversized. In fact, all volumetric pumps are manufactured in such a way that the motor is in the start-up state under load since the pumping cavities move directly from the motor and the friction to be overcome during start-up or the corresponding torque, especially in small machines, is often greater than the torque that the motor can deliver as a result of random external factors. In the pump according to the invention the motor starts idling, as will be seen from the following description, only with the increase in speed the pumping action is started. In addition, in the event that the liquids were frozen, for example, the pump would operate idle, reaching a speed even greater than the operating speed, thereby promoting fluid crumbling and pump reactivation. Indeed, it is known that the smallest and smallest pumps are used in applications that require fast and irregular work, many are also used in environmental conditions that are extremely variable, with dust, moisture, corrosive media, etc. in the Medium may be present, they also often have to work at temperatures that are very variable, which is why start-up could also be critical. For example, very low temperatures can freeze the moisture contained in the medium, which has condensed at certain points in the pump, thereby jeopardizing the start-up, even if this was only temporary. The known pumps all have more or less the above-mentioned problems with regard to their function and mode of operation, for example the gear pumps, the capsule pumps, the vane pumps, the piston pumps, etc. There are also pumps whose pumping element has a flexible tube or tube between the suction mouth and drain mouth which is very soft and pliable and which is pinched together by a rotating triangular prism, being divided into small chambers filled with liquid which is in motion between the suction mouth and the drain mouth. This latter pump is very simple and economical and widespread, but this pump also does not solve the problem of starting under load, the pumping tube or tube also being heavily stressed and consequently subject to rapid wear and aging. As has already been stated, the pump according to the invention solves the problems which exist in the conventional volumetric pumps, since the fluid is separated and isolated from the parts in rotation, since it is still possible to start the motor at idle without any problems and, finally, because The stress on the membrane required for pumping is minimal while still having a degree of sealing between the pumping chambers that is larger than the tube or tubing pump described above.

Weitere Vorteile ergeben sich aus den nachgeordneten Unteransprüchen.Further advantages result from the subordinate claims.

In der Zeichnung ist ein Ausführungsbeispiel des Gegenstandes der Erfindung dargestellt. Es zeigen:

  • Fig. 1 eine Pumpe gemäß der Erfindung in einer Draufsicht in einem Schnitt gemäß der Linie X-X der Fig. 3,
  • Fig. 2 die Anordnung nach Fig. 1 in einem Schnitt gemäß der Linie Y-Y, wobei der Rotorteil und der Motor 10 entfernt worden sind, und
  • Fig. 3 die Anordnung nach Fig. 1 in einem Schnitt gemäß der Linie Z-Z der Fig. 1, während
  • Fig. 4 die Fördermenge Q mit der erfindungsgemäßen Pumpe bei normalem Saugdruck und bei dem Druck P für eine Anzahl von Umdrehungen n1 bzw. n2 zeigt.
In the drawing, an embodiment of the object of the invention is shown. Show it:
  • 1 shows a pump according to the invention in a plan view in a section along the line XX of FIG. 3,
  • Fig. 2 shows the arrangement of FIG. 1 in a section along the line YY, wherein the rotor part and the motor 10 have been removed, and
  • Fig. 3 shows the arrangement of FIG. 1 in a section along the line ZZ of FIG. 1, while
  • Fig. 4 shows the flow rate Q with the pump according to the invention at normal suction pressure and at the pressure P for a number of revolutions n 1 and n2.

In Fig. 1 bis 3 ist der Motor mit 10 bezeichnet, dessen Drehrichtung mit dem Pfeil 11 angegeben ist; 2 ist der Rotor, der in den Ausnehmungen 20 und 21 zwei kugelförmige oder sphärische Massen 22, 23 trägt, wobei die obigen Angaben nur als Beispiel dienen, keineswegs beschränkend sein sollen, weder hinsichtlich der Anzahl, noch hinsichtlich der Form der Massen. Die beiden Massen können sich frei bewegen und in den Ausnehmungen 20 und 21 gleiten und hierbei jede Stellung einnehmen, die zwischen den Achsen 24 und 25 für die Masse 22 und 26 und 27 für die Masse 23 liegt. Die Stellungen 24 und 26 werden dann eingenommen, wenn die Pumpe stillsteht, hingegen werden die Stellungen 25 und 27 eingenommen, wenn der Motor umläuft und die Pumpe arbeitet und demzufolge die Membran 4 sich verformt, bis sie am Grund des Kanals 54 anliegt. Es ist offensichtlich, daß, um eine gute Führung zu erreichen, die Schnäbel 28 und 29 des Rotors 2 über die Achsen 25 und 27 der Kugeln hinausstehen müssen. In den Figuren der Zeichnung ist 3 eine ringförmige Ausnehmung oder Höhlung, deren Querschnitt in der Ruhestellung besser ersichtlich ist aus Fig. 2 und die durch die Kombination der Membran 4 mit dem am äußeren starren Körper 5 angebrachten oder in diesen Körper eingearbeiteten Kanal erzielt wird, der mit 54 bezeichnet ist.1 to 3, the motor is designated 10, the direction of rotation is indicated by the arrow 11; 2 is the rotor, which carries two spherical or spherical masses 22, 23 in the recesses 20 and 21, the above information being used only as an example and should in no way be limiting, neither in terms of the number nor in terms of the shape of the masses. The two masses can move freely and slide in the recesses 20 and 21 and take any position that lies between the axes 24 and 25 for the mass 22 and 26 and 27 for the mass 23. Positions 24 and 26 are taken when the pump is stopped, positions 25 and 27 are taken when the motor is running and the pump is working and consequently the membrane 4 deforms until it bears against the bottom of the channel 54. It is obvious that in order to achieve good guidance, the beaks 28 and 29 of the rotor 2 must protrude beyond the axes 25 and 27 of the balls. In the figures of the drawing 3 is an annular recess or cavity, the cross section of which can be seen more clearly in the rest position from FIG. 2 and which is achieved by the combination of the membrane 4 with the channel attached to the outer rigid body 5 or incorporated into this body, which is designated 54.

Die Zeichnung zeigt lediglich als Beispiel eine Ausführungsform der Pumpe gemäß der Erfindung, bei der der starre Körper 5 aus zwei identischen Hälften besteht: die Hälfte 50 und die Hälfte 51, gegen die vom Inneren heraus die Membran 4 angedrückt wird; bei dieser konstruktiven Lösung muß es nicht sein, daß die Membran eine Schlauchform hat, sie kann jedoch einfach aus einem Band, aus einem geeigneten Elastomer bestehen, dessen Höhe mit 41 bezeichnet ist und das auf zwei Ringen 60 und 61 aufgewickelt ist, die durch den Vorsprung oder Ansatz 62 verbunden sind, um ein einziges Stück zu bilden, und die zusammen das Stück 6 für das Haltern der Membran bilden. Der Ansatz oder Vorsprung 62 dient dazu, die Schenkel des Bandes 42 und 43 (Fig. 1) zu haltern und die Umfangsenden 30 und 31 des ringförmigen Zwischenraums zu isolieren und zu verschließen. Die beiden Hälften 50 und 51 werden fest um das Element 6 herum miteinander verbunden und mit Hilfe von Bohrungen und entsprechenden Stiften oder Zapfen 59 ausgerichtet und aneinander befestigt, und mit Hilfe der Ausformungen 55 und 56 des Körpers 5 und der entsprechenden Gegenstücke 63 und 64 haltern sie die Membran 4 dicht. Der Ansatz oder Vorsprung 62 trägt die Verdickung 65 bzw. ein entsprechendes Formstück, um die Schenkel des Bandes 4 besser zu haltern. Die Hälften oder Halbschalen 50 und 51 des Gehäuses 5 tragen die Anschlüsse 52 und 53 für die Mediumleitungen, die parallel zur Achse Z-Z orientiert und ausgerichtet sind, um das Pressen der vorgenannten Halbschalen zu erleichtern, wobei die Anschlüsse jedoch auch anders ausgerichtet sein oder angebracht sein können. 7 ist der Deckel mit der Halterung 71 für den Rotor; 57 und 58 sind die Nuten, um den Deckel 7 und den Motor 1 zu haltern.The drawing shows, by way of example only, an embodiment of the pump according to the invention, in which the rigid body 5 consists of two identical halves: half 50 and half 51, against which the membrane 4 is pressed from the inside; in this constructive solution it does not have to be that the membrane has a tubular shape, but it can simply consist of a band, of a suitable elastomer, the height of which is designated 41 and which is wound on two rings 60 and 61, which are separated by the Projection or projection 62 are connected to form a single piece, and which together form the piece 6 for holding the membrane. The projection or projection 62 serves to hold the legs of the band 42 and 43 (FIG. 1) and to isolate and close the circumferential ends 30 and 31 of the annular space. The two halves 50 and 51 are firmly connected to each other around the element 6 and aligned and fastened to one another by means of bores and corresponding pins or pins 59, and are held by means of the formations 55 and 56 of the body 5 and the corresponding counterparts 63 and 64 the membrane 4 tight. The approach or lead 62 carries the thickening 65 or a corresponding shaped piece in order to better hold the legs of the band 4. The halves or half-shells 50 and 51 of the housing 5 carry the connections 52 and 53 for the medium lines, which are oriented and aligned parallel to the ZZ axis in order to facilitate the pressing of the aforementioned half-shells, but the connections can also be oriented or fitted differently can. 7 is the lid with the holder 71 for the rotor; 57 and 58 are the grooves for holding the cover 7 and the motor 1.

Im folgenden wird die Wirkungsweise beschrieben, wobei man eine Drehrichtung des Motors gemäß Pfeil 11 voraussetzt:The mode of operation is described below, assuming a direction of rotation of the motor according to arrow 11:

Die durch die Fliehkraft nach außen bewegten Massen nehmen die Stellungen ein, die durch die Achsen 25 und 27 angedeutet sind, der ringförmige Zwischenraum 3 wird in drei voneinander getrennte, gegeneinander isolierte Kammern unterteilt, von denen die Kammer 32 vom Ende 30 bis zur Kugel 22 geht, die Kammer 33 von der Kugel 22 bis zur Kugel 23 reicht und die Kammer 34 von der Kugel 23 bis zum Ende 31 geht. Infolge der Bewegung wird die Kammer 32 immer größer, und demzufolge, weil die Membran 4 bestrebt ist, infolge ihrer Elastizität in die Ruhestellung zurückzukehren, wird die Flüssigkeit, das Fluid, vom Anschluß 52 im Sinne des Pfeiles 35 angesaugt. Die Kammer 33 verändert ihr Volumen nicht, da die Relativstellung der beiden Kugeln 22 und 23 einander gegenüber feststeht, sie bewegt sich jedoch vor im Sinne der Bewegung. Die Kammer 34 hingegen wird immer kleiner, weil die Masse 23 vorläuft, und infolgedessen wird das Fluid im Sinne der Pfeile 36 ausgestoßen. Wenn die Kugel 23 den Anschluß 53 überschreitet, wird das in der Kammer 33 enthaltene Fluid bzw. Medium zur Auslaßöffnung 36 gelangen; anschließend bewegt sich die Kugel 23 in Richtung auf die Ansaugöffnung 32, wobei ein identischer Zyklus wie derjenige der Kugel 22 folgt. Wenn man die Drehbewegung umkehrt, wird die Funktion bzw. Wirkungsweise der Pumpe umgekehrt, das heißt, die Öffnung 53 wird zur Saugöffnung, die Öffnung 52 zur Ablaß- oder Ausstoßöffnung.The masses moved outwards by the centrifugal force assume the positions indicated by the axes 25 and 27, the annular space 3 is divided into three separate, mutually insulated chambers, of which the chamber 32 from the end 30 to the ball 22 goes, the chamber 33 extends from the ball 22 to the ball 23 and the chamber 34 goes from the ball 23 to the end 31. As a result of the movement, the chamber 32 becomes larger and, consequently, because the membrane 4 tends to return to the rest position due to its elasticity, the liquid, the fluid, is sucked in by the connection 52 in the direction of the arrow 35. The chamber 33 does not change its volume since the relative position of the two balls 22 and 23 is fixed relative to one another, but it moves forward in the sense of the movement. The chamber 34, on the other hand, becomes smaller and smaller because the mass 23 is flowing in front, and as a result the fluid is expelled in the direction of the arrows 36. If the ball 23 exceeds the connection 53, the fluid or medium contained in the chamber 33 will reach the outlet opening 36; then the ball 23 moves in the direction of the suction opening 32, an identical cycle as that of the ball 22 follows. When the rotational movement is reversed, the function of the pump is reversed, that is to say the opening 53 becomes the suction opening and the opening 52 the discharge or discharge opening.

Die Kriterien hinsichtlich der Dimensionierung dieser Pumpe sind einfach, weil das transportierte Medium abhängig ist von der Anzahl der Umdrehungen mal das Volumen des ringförmigen Zwischenraums abzüglich des toten Volumens der Massen. Der Druck, auf den die Pumpe das Medium bringen kann, ist proportional mit dem Quadrat der Anzahl der Umdrehungen, und der genaue Wert kann bestimmt werden mit Hilfe der Formel mit Bezug auf die Zentrifugalkraft, wenn man berücksichtigt, daß diese dem Produkt aus dem Druck des Fluids und der Oberfläche der der Ablaßöffnung zugeordneten Kugel entgegenwirken muß, ohne daß man den Einfallswinkel vernachlässigt. Es ergibt sich hieraus, daß dann, wenn man die Anzahl der Umdrehungen in geeigneter Weiser reguliert, der maximale Auslaßdruck reguliert werden kann, dessen theoretisches Diagramm aus der Liefermenge Q an Luft oder Fluid bei normalem Ansaugdruck und dem Druck P beispielsweise für eine hypothetische Anzahl von Umlaufbewegungen ni und für eine andere Drehzahl n2 in Fig. 4 gezeigt ist.The criteria regarding the dimensioning of this pump are simple because the medium transported depends on the number of revolutions times the volume of the annular space minus the dead volume of the masses. The pressure to which the pump can bring the medium is proportional to the square of the number of revolutions, and the exact value can be determined using the formula relating to the centrifugal force, taking into account that this is the product of the pressure must counteract the fluid and the surface of the ball associated with the drain opening without neglecting the angle of incidence. It follows that if the number of revolutions is regulated in a suitable manner, the maximum outlet pressure can be regulated, the theoretical diagram of which delivers the quantity Q of air or fluid at normal intake pressure and the pressure P for a hypothetical number of, for example Orbital movements ni and for another speed n 2 is shown in FIG. 4.

Die Pumpe gemäß der Erfindung kann deswegen ein vorteilhaftes Gerät werden, das aus der Pumpe und dem Druckregulierer zusammengesetzt ist, der einfach anhand der Drehzahl arbeitet. Mit Hilfe einer elektronischen Regelung mit geschlossenem Ring kann man auf diese Weise fein regulierte Drücke erzielen.The pump according to the invention can therefore be an advantageous device, which is composed of the pump and the pressure regulator, which works simply based on the speed. With the help of an electronic control with a closed ring, finely regulated pressures can be achieved in this way.

Wie aus der vorhergehenden Beschreibung hervorgeht, gibt es verschiedene Arten, die Pumpe herzustellen, ohne aus dem Schutzumfang der vorliegenden Erfindung bzw. des vorliegenden Patentes herauszugelangen. So z.B. kann der Körper 5 (das Gehäuse 5) einstückig sein und auch eine innere Oberfläche haben, die glatt ist und keinen Kanal besitzt; in diesem Falle kann der ringförmige Zwischenraum z.B. mit Hilfe der Membran 4 erhalten werden, die im Inneren des Gehäuses oder Körpers 5 gespannt ist, derart, daß sie selbst den ringförmigen Zwischenraum bildet; die Membran kann im übrigen mit Hilfe jedes anderen geeigneten Systems im Inneren des Körpers oder Gehäuses 5 angebracht werden, außer der oben beschriebenen Anordnung mit Hilfe des Körpers 6, wobei sie durch Verkleben oder Vulkanisieren unmittelbar auf den geeigneten oben beschriebenen Wänden befestigt werden kann; in diesem Falle können die Massen zwei kleine Zylinder sein, deren Höhe gleich wie oder größer als die Höhe des ringförmigen Zwischenraums ist.As is apparent from the foregoing description, there are various ways to manufacture the pump without departing from the scope of the present invention or patent. So e.g. the body 5 (housing 5) may be in one piece and also have an inner surface that is smooth and has no channel; in this case the annular space may e.g. can be obtained by means of the membrane 4 which is stretched inside the housing or body 5 in such a way that it itself forms the annular space; the membrane can, moreover, be attached to the inside of the body or housing 5 by means of any other suitable system, apart from the arrangement described above using the body 6, and it can be attached directly to the suitable walls described above by gluing or vulcanizing; in this case the masses can be two small cylinders, the height of which is equal to or greater than the height of the annular space.

Claims (4)

1. A volumetric pump acting in the manner of a rotary pump for liquid or gaseous media, with a motor-driven rotary piston or rotor (2) in a housing with inlet and outlet ports for the medium, said rotary piston or rotor being mounted in the housing bore to rotate about its longitudinal axis, the housing (5) being designed as a rigid single- or multi-part shape with a cylindrical longitudinal bore incorporating a tubular membrane (4) fitted over the entire circumference of the housing (5) in the area of the two cylindrical axial ends of its longitudinal bore to form a liquid and/or gas tight seal and extending at a distance from the wall of the longitudinal bore between the two axial ends, thus enclosing a cavity (3) therewith, the circumferential ends (30, 31) of which are sealed and insulated against each other by the fact that the membrane (4) is at these points continuously and tightly attached to the housing (5) over its entire axial length, the area of the above circumferential ends (30, 31) incorporating two openings connecting the cavity (3) to the medium supply or discharge, thus being capable of forming the suction port (52) or the discharge port (53), and two or more shaped parts (22, 23) located in suitable recesses (20, 21) of the rotor (2) being provided inside the unit comprising the housing (5), the membrane (4) and the cavity (3) in an axial position relative to said cavity (3), which shaped parts (22, 23) can be made to rotate together with the rotor (2) about the longitudinal axis of the cavity by means of a drive motor (10), and which, when contacting the membrane (4) and pressing it against the wall of the housing bore, there effect a tight seal of the cavity (3), dividing it into several chambers (32, 33, 34) which perform a conti- nous rotary movement with pumping action progressing from the suction port to the discharge port, characterised in that the tubular or tape-like but tubular wound membrane (4) forms, in combination with the wall of the longitudinal bore of the housing (5) a cavity (3) in the form of a discontinuous ring, and in that the shaped parts (22, 23) are so arranged in the rotor (2) that they can, in the course of their rotary movement, slide radially to and fro in the recesses (20, 21) while acting as weights, being capable of radially alternating between a retracted inner position and, under the influence of centrifugal forces, an extreme outer position in which alone they press the membrane (4) against the wall of the housing bore.
2. A pump according to Claim 1, characterised in that the housing (5) consists of two symmetrical halves (50, 51) extending along two "seams" corresponding to two opposing generatices of the cylinder (5) and forming a hollow body, in which the membrane (4) is so arranged that it forms a kind of tube, and in that the halves (50, 51) are designed as semicylindrical cups with projections extending radially outwards in the seam area, said projections contacting each other in the area of their outer ends while otherwise enclosing a space in which the two axially extending circumferential ends (30, 31) of the membrane (4) are installed and pressed against the walls of the space by means of a filling piece (65) to form a seal.
3. A pump according to Claim 1 or 2, characterised in that two shaped parts (22, 23) are combined to form a unit with the aid of the piston (2) mounted in the centre of the longitudinal bore of the housing (5) to rotate about its longitudinal axis, said shaped parts being guided in diametrically opposed recesses (20, 21) open towards the outside for radial movement under the influence of centrifugal forces.
4. A pump according to any of Claims 1 to 3, characterised in that the annular cavity (3) is formed by a channel machined into the wall of the longitudinal bore of the housing (5) and open towards the interior of the longitudinal bore, and in that the tape-like membrane (4) is held by rings (60, 61) in the area of its axial ends, said rings pressing the membrane (4) against the wall of the longitudinal bore (5).
EP86113596A 1985-11-18 1986-10-02 Volumetric fluid pump working as a pump with rotary pistons Expired - Lifetime EP0223025B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8585614A IT1210536B (en) 1985-11-18 1985-11-18 VOLUMETRIC PUMP FOR LIQUID OR GASEOUS FLUIDS.
IT8561485 1985-11-18

Publications (3)

Publication Number Publication Date
EP0223025A2 EP0223025A2 (en) 1987-05-27
EP0223025A3 EP0223025A3 (en) 1988-02-10
EP0223025B1 true EP0223025B1 (en) 1990-12-12

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ID=11329005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113596A Expired - Lifetime EP0223025B1 (en) 1985-11-18 1986-10-02 Volumetric fluid pump working as a pump with rotary pistons

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EP (1) EP0223025B1 (en)
DE (1) DE3676167D1 (en)
IT (1) IT1210536B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1220167B (en) * 1987-12-18 1990-06-06 Renato Vicentini PERFECT VOLUMETRIC PUMP FOR LIQUID OR GASEOUS FLUIDS
US5193977A (en) * 1991-11-22 1993-03-16 Don Dame Flexible membrane sealless centrifugal pump
EP3056733B1 (en) * 2013-10-09 2023-11-08 Welco Co., Ltd Pump

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH331944A (en) * 1956-02-03 1958-08-15 Clarence Ford Reginald Rotary pump
DE2702123A1 (en) * 1977-01-20 1978-07-27 Hartmut Kowalzik Radial spherical membrane pump - consists of annular pump housing with fixed bearing brackets to accept drive shaft with balls

Also Published As

Publication number Publication date
EP0223025A3 (en) 1988-02-10
IT1210536B (en) 1989-09-14
DE3676167D1 (en) 1991-01-24
EP0223025A2 (en) 1987-05-27
IT8585614A0 (en) 1985-11-18

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