EP0223025B1 - Pompe volumétrique pour fluides fonctionnant comme une pompe à pistons tournants - Google Patents

Pompe volumétrique pour fluides fonctionnant comme une pompe à pistons tournants 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
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
EP86113596A
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German (de)
English (en)
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EP0223025A3 (en
EP0223025A2 (fr
Inventor
Renato Vicentini
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Individual
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Individual
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Publication date
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Publication of EP0223025A2 publication Critical patent/EP0223025A2/fr
Publication of EP0223025A3 publication Critical patent/EP0223025A3/de
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Publication of EP0223025B1 publication Critical patent/EP0223025B1/fr
Anticipated expiration legal-status Critical
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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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Claims (4)

1. Pompe volumétrique fonctionnant à la manière d'une pompe à piston tournant et destinée à des milieux liquides ou gazeux, laquelle comporte, dans un carter muni d'ouvertures d'entrée et de sortie pour le milieu à déplacer, un piston tournant ou un rotor (2) entraîné par un moteur et monté dans l'alésage du carter en pouvant tourner autour de son axe longitudinal, cependant que le carter (5) présente la forme d'une pièce façonnée en un ou plusieurs éléments et munie d'un alésage longitudinal cylindrique dans lequel est prévue une mambrane (4) en forme de tuyau qui, dans la région des deux extrémités axiales en forme de cylindre de l'alésage longitudinal du carter (5), est montée sur celui-ci de manière étanche aux liquides et/ou aux gaz sur tout son pourtour et qui s'étend entre ces deux extrémités axiales à distance de la paroi de l'alésage longitudinal de telle sorte qu'elle forme avec celle-ci un volume intermédiaire (3) dont les deux extrémités périphériques (30, 31) sont fermées et isolées l'une par rapport à l'autre grâce au fait que la membrane (4) est fixée en ces endroits au carter (5), sans interruption sur la totalité de la longueur axiale et avec une bonne étanchéité; cependant que, dans la région des extrémités périphériques précitées (30,31), il est prévu deux ouvertures qui mettent en communication le volume intermédiaire (3) avec la source de fluide ou avec le déchargement du fluide, respectivement, et qui peuvent ainsi former l'orifice d'aspiration (52) ou l'orifice de refoulement (53), respectivement; et cependant qu'il est prévu, à l'intérieur de l'ensemble composé du carter (5), de la membrane (4) et du volume intermédiaire (3), et dans une disposition correspondante dans le sens axial par rapport au volume intermédiaire précité (3), deux pièces façonnées ou plus (22, 23) qui sont logées dans des évidements correspondants (20, 21) du rotor (2), qui peuvent être mises en rotation avec le rotor (2), en formant un tout, autour de l'axe central longitudinal du volume intermédiaire et à l'aide d'un moteur d'entraînement (10), et qui, lorsqu'elles reposent sur la membrane (4) et qu'elles la poussent contre la paroi de l'alésage du carter, produisent à cet endroit une fermeture étanche du volume intermédiaire (3) et le divisent ainsi en diverses chambres (32, 33, 34), les chambres (32, 33, 34) formées de cette manière exécutant un mouvement de rotation continu à effet de pompage qui se poursuit depuis l'orifice d'aspiration vers l'orifice de refoulement, caractérisée par le fait que la membrane (4) en forme de tuyau, ou en forme de bande, mais enroulée en forme de tuyau, forme avec la paroi de l'alésage longitudinal du carter (5) un volume intermédiaire (3) sous la forme d'une couronne qui n'est pas fermée en elle-même, et par le fait que les pièces façonnées (22, 23) sont disposées dans le rotor (2) de telle manière qu'au cours de leur mouvement de rotation, elles soient mobiles en glissement de va-et-vient en direction radiale dans les évidements (20, 21), en agissant comme une masse d'inertie, de telle façon qu'elles puissent se déplacer à chaque fois en va-et-vient en direction radiale entre une position intérieure rétractée et, sous l'action de la force centrifuge, une position extérieure dans laquelle elles sont seules à pousser la membrane (4) sur la paroi de l'alésage du carter.
2. Pompe selon la revendication 1, caractérisée par le fait que le carter (5) se compose de deux moitiés symétriques (50, 51) qui sont posées l'une sur l'autre le long de deux "coutures" correspondant à deux génératrices mutuellement opposées du cylindre (5) et qui forment ainsi un corps creux dans lequel la membrane (4) est insérée de telle manière qu'elle forme une sorte de tuyau, et par le fait que les moitiés (50, 51) présentent la forme de coquilles en demi-cylindres qui comportent, dans la région de l'une des coutures, des prolongements dirigés radialement vers l'extérieur, lesquelles reposent l'un sur l'autre dans la région de leurs extrémités extérieures et forment par ailleurs entre eux un volume intermédiaire dans lequel sont insérées les deux extrémités périphériques (30, 31) de la membrane (4) qui s'étendent radialement et qui sont maintenues par serrage étanche contre les parois du volume intermédiaire à l'aide d'une pièce de remplissage (65).
3. Pompe selon la revendication 1 ou 2, caractérisée par le fait que deux pièces façonnées (22, 23) peuvent être assemblées en un tout à l'aide du piston (2) qui est monté tournant au centre de l'alésage longitudinal du carter (5) autour de l'axe longitudinal de celui-ci, cependant qu'il peut être déplacé en va-et-vient en direction radiale sous l'effet de la force centrifuge dans des évidements (20, 21) ouverts vers l'extérieur et diamétralement opposés l'un par rapport à l'autre.
4. Pompe selon l'une des revendications 1 à 3, caractérisée par le fait que le volume intermédiaire annulaire (3) est constitué par un canal ménagé dans la paroi de l'alésage longitudinal du carter (5) et ouvert vers l'intérieur de l'alésage longitudinal, et par le fait que la membrane en forme de bande (4) est maintenue dans la région des deux extrémités axiales par des bagues (60, 61) qui serrent la membrane (4) sur la paroi de l'alésage longitudinal (5).
EP86113596A 1985-11-18 1986-10-02 Pompe volumétrique pour fluides fonctionnant comme une pompe à pistons tournants Expired - Lifetime EP0223025B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8561485 1985-11-18
IT8585614A IT1210536B (it) 1985-11-18 1985-11-18 Pompa volumetrica per fluidi liquidi o gassosi.

Publications (3)

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

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ID=11329005

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Application Number Title Priority Date Filing Date
EP86113596A Expired - Lifetime EP0223025B1 (fr) 1985-11-18 1986-10-02 Pompe volumétrique pour fluides fonctionnant comme une pompe à pistons tournants

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1220167B (it) * 1987-12-18 1990-06-06 Renato Vicentini Pompa volumetrica per fluidi liquidi o gassosi perfezionata
US5193977A (en) * 1991-11-22 1993-03-16 Don Dame Flexible membrane sealless centrifugal pump
WO2015052795A1 (fr) * 2013-10-09 2015-04-16 株式会社ウエルコ Pompe

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH331944A (fr) * 1956-02-03 1958-08-15 Clarence Ford Reginald Pompe rotative
DE2702123A1 (de) * 1977-01-20 1978-07-27 Hartmut Kowalzik Radial-kugelmembranpumpe

Also Published As

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

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