EP0130374B1 - Flexible tube pump - Google Patents

Flexible tube pump Download PDF

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Publication number
EP0130374B1
EP0130374B1 EP84106168A EP84106168A EP0130374B1 EP 0130374 B1 EP0130374 B1 EP 0130374B1 EP 84106168 A EP84106168 A EP 84106168A EP 84106168 A EP84106168 A EP 84106168A EP 0130374 B1 EP0130374 B1 EP 0130374B1
Authority
EP
European Patent Office
Prior art keywords
hose
rotor
pump
dividing member
suction chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84106168A
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German (de)
French (fr)
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EP0130374A3 (en
EP0130374A2 (en
Inventor
Manfred Streicher
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.)
Crane Process Flow Technologies GmbH
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Streicher Manfred
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Filing date
Publication date
Application filed by Streicher Manfred filed Critical Streicher Manfred
Priority to AT84106168T priority Critical patent/ATE22159T1/en
Publication of EP0130374A2 publication Critical patent/EP0130374A2/en
Publication of EP0130374A3 publication Critical patent/EP0130374A3/en
Application granted granted Critical
Publication of EP0130374B1 publication Critical patent/EP0130374B1/en
Expired legal-status Critical Current

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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
    • F04B43/1253—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

Definitions

  • the invention relates to a peristaltic pump in which a rotor rotates in the interior of a housing in the direction from a suction chamber to a pressure chamber and presses on a hose laid between a suction nozzle and a pressure nozzle along a peripheral wall of the housing.
  • a peristaltic pump with a housing with a peripheral wall, which is circular cylindrical at least in a pump section, which connects a suction chamber with a pressure chamber in the housing, a flat rear end wall, the housing on its back closes, a flat front wall, which closes the front of the housing, a suction nozzle through which the fluid to be pumped is sucked into the suction chamber, and a pressure nozzle through which the fluid is pressed out of the pressure chamber, a rotor which is located in the interior of the Rotates housing in the direction from the suction chamber to the pressure chamber, the rotor axis of which coincides with the cylinder axis of the pump section and which has at least one squeeze body with the squeezer body axis parallel to the rotor axis, a band-shaped, essentially length-stable separating part which is placed around the rotor and on the front wall and the abuts the rear bulkhead, a hose between the suction T
  • a squeeze body of the rotor does not press directly on the hose, but rather via the interposed band-shaped separating part.
  • the liquid serves to lubricate the pump parts, in particular also the separating part, which lies tightly against the front wall and the rear end wall over its entire circumference.
  • the pumping process takes place in that liquid is pressed out of the hose by squeezing it together.
  • New liquid is supplied in that the hose has its own resilience, which is reinforced by a spring, so that its interior widens again after being squeezed together, as a result of which liquid is sucked in.
  • a similarly constructed pump is known, in which, however, the separating part is not in contact with walls and is also not lubricated by a liquid. However, the separating part is fastened between the pressure and suction nozzle outside the outermost rotor circumference, which has the advantage that the separating part does not slip and thus does not exert any frictional forces on the hose.
  • the invention has for its object to provide a peristaltic pump which has a simple structure and in which the pumping process is supported by vacuum.
  • the invention is given by the features of the main claim. It is characterized in that, in a pump of the type mentioned at the outset, the separating part has such a width, at least in its suction chamber section, that when the rotor rotates, it is sealed off from the rear end wall and the front wall at least with its suction chamber section by the liquid mentioned is pushed, and in the interior between the pressure chamber and suction chamber fixed to a fastening part. is attached outside the outermost rotor circumference, which separates the suction chamber from the pressure chamber, and the hose essentially does not have its own resilience.
  • the pump according to the invention is therefore a vacuum-assisted peristaltic pump which generates the vacuum required for drawing in the liquid to be pumped.
  • a particular advantage is that the vacuum is only generated in the suction chamber, but not in the pressure chamber. In the pressure chamber, the squeeze bodies do not need to squeeze the hose against a negative pressure force.
  • a vacuum-assisted peristaltic pump that generates its own vacuum is also known from FR-A-1 394 047.
  • the suction chamber is connected to the interior of the housing via an adjusting valve, with the aid of which the extent of the negative pressure in the interior of the housing can be adjusted. Since the entire interior of the housing is evacuated, the negative pressure also acts in the pressure chamber, so that when the liquid is squeezed out of the hose, the squeeze bodies have to compress the hose in the pressure chamber against the force of the negative pressure.
  • a pump according to the invention for a delivery rate of about 30,000 l / h weighs only about 30 kg, while a conventional peristaltic pump with an additional vacuum pump weighs about five times for the same delivery rate.
  • the pump runs at around 400 rpm, while a conventional vacuum-assisted pump runs at around 30-100 rpm. running.
  • the lighter design and the higher running speed result from the fact that, in the pump according to the invention, vacuum is only generated in the suction space, but not also in the pressure space.
  • the rotor and the bearing for the rotor and thus the entire housing can therefore be made lighter.
  • the peristaltic pump 30 of the exemplary embodiment according to FIGS. 1-3 has, as main components, a housing 31 and in the interior of which a delivery hose 32, a runner 33 and a separating part 34.
  • the housing 31 has approximately the shape of a cylindrical disk with a rear end wall 35, a front wall formed from a front end wall 36 and a cover 43 and a peripheral wall 37, through which walls an interior 38 is enclosed.
  • the upper section of the circumferential wall 37 is flat, and two nozzles are inserted into this section, of which the left one is called the suction nozzle 45 and the right one is called the pressure nozzle 46.
  • Which spigot acts as a suction spigot and which acts as a pressure spigot depends on the direction of rotation of the rotor 33.
  • the hose 32 is fastened to the two connecting pieces 45 and 46 with hose clamps 47 so that they can be replaced easily.
  • the hose 32 is laid along the peripheral wall 37.
  • the rotor 33 is mounted in a bearing housing 39 which is connected to the rear end wall 35.
  • the bearing housing can also be missing if the rotor is placed directly on the shaft of a drive motor.
  • the rotor 33 is triangular, each with a pair of rollers 52 at the corner points.
  • the separating part 34 is placed, which is firmly connected to the housing 31 in that it is stretched between a fastening rib 53 on the housing and a clamping body 55 which can be tightened by a clamping screw 57.
  • the clamping body 55 is rounded so that it cannot kink even when it moves back and forth.
  • the width of the separating part 34 is selected such that it bridges the distance between the rear end wall 35 and the cover 43.
  • the separating part 34 is band-shaped and essentially stable in length.
  • An elastic pad 48 is applied to the pump section of the peripheral wall 37.
  • the thickness of the support 48 is dimensioned such that the hose 32 is then pushed completely between the separating part 34 and the support 48 when a pair of rollers 52 runs inside the separating part 34 along the pump section.
  • a barrier liquid (not shown) is present in the interior of the housing, in particular in the space enclosed by the separating part 34. This is filled through a filler hole with filler screw 87 in the cover 43 until the liquid escapes at the location of a screwed-out control screw 88 in the middle of the cover. Then the control screw 88 and the filler screw 87 are screwed in again.
  • FIGS. 4.1-4.4 The function of the pump according to FIGS. 1-3 is now explained in more detail using the flow diagrams according to FIGS. 4.1-4.4. It is assumed that the rotor 33 rotates counterclockwise, that is to say in the direction of the arrow 64 in FIG. 1. In the position shown in FIG. 4.1, the runner has rotated so far that one of its pairs of rollers 52, which will be referred to as the first pair 52.1 in the following, just squeezes the hose part originating from the suction port 45 completely. A part of the interior 38 is then separated by the housing walls and the separating part 34, which is referred to below as the suction space 38.1. A suction chamber 63.1 is formed in the hose 34 between the suction nozzle and the squeezing point.
  • the hose 32 is squeezed off at a further point by the pair of rollers 52.2 following in the direction of rotation.
  • the chamber enclosed by the hose between this second squeezing point and the pressure port 46 is referred to below as the pressure chamber 63.2.
  • the space surrounded by the housing walls and the separating part 34, which is in communication with the ambient air via a ventilation opening 93 in the flat section of the peripheral wall 37, is referred to below as the pressure space 38.2.
  • the volume enclosed by the hose between the first pair of rollers 52.1 and the second pair 52.2 is referred to as the intermediate chamber 63.3. The volume of this intermediate chamber remains unchanged when the rotor is turned.
  • the volume of the suction space 38.1 has increased. Since this space is sealed off by the housing walls and the separating part 34, a negative pressure has developed in it. This negative pressure leads to the substantially flaccid hose 32 being blown up by the advancing fluid, thus increasing the volume of the suction chamber 63.1. At the same time, the volume of the pressure chamber 63.2 has decreased due to the second pair of rollers 52.2 rolling along the peripheral wall in the direction of the pressure port 46. The pump has therefore sucked in fluid 45 via the suction nozzle and dispensed fluid 46 via the pressure nozzle.
  • the hose pump 30 thus acts like a conventional hose pump, in which fluid is pressed out of a hose by a squeeze body.
  • the pump 30 functions in such a way that, with the help of the separating part 34, it forms a suction space 38.1 that increases when the rotor 33 rotates, in which the pressure drops further and further, so that it finally becomes lower than the pressure in the suction chamber 63.1 of the delivery hose 32, whereby fluid to be pumped is pressed into the suction chamber 63.1.
  • the vacuum-tight seal between the separating part 34 and the rear end wall 35 and the cover 43 is essential, for which purpose the sealing liquid mentioned at the beginning inside the separating part 34 is used.
  • this barrier liquid is partially sucked into the suction space 38.1 and reaches the pressure space 38.2 when the rotor 33 is rotated. So that the barrier liquid then returns to the space enclosed by the separating part 34, the pump 30 has a transfer opening 85 in the housing cover in the area of the pressure chamber 38.2, a further transfer opening 86 in the middle of the cover and a transfer channel 81 connecting the two openings.
  • Wing-shaped ribs 78 are provided on the rotor 33, which inject the reintroduced barrier liquid onto the inside of the separating part 34 so that the barrier liquid can again perform its sealing function there.
  • the sealing liquid is drained by opening the cover 43 by removing screws 89, the hose clamps 47 are loosened, the worn hose is removed, and then a new hose is attached in the reverse order.
  • the cover can then be replaced with a 90 ° offset if the pump is to be used in a different direction of rotation, i.e. clockwise.
  • By turning the cover it is ensured that the transfer channel 81 again establishes the connection between the pressure space 38.2 and the middle space.
  • the rotated position is shown in dash-dot lines in FIG. 3, as are the directions of the pumped fluid in dash-dot lines.
  • the conveyor hose 32 is, for. B. a normal plastic hose. But he can also by. a stable textile outer skin 66 can be formed with a plastic inner coating 67 which is resistant to the fluid to be pumped (FIG. 5).
  • the conveying hose 32 can also consist of a textile outer hose 68, which essentially absorbs the negative pressure forces that occur, and an unstable, resistant inner hose 69 (FIGS. 6, 7).
  • the hoses are advantageously each connected to fittings by means of hose clamps in such a way that they can be detached from the fittings and thus replaced without opening the pump cover.
  • the circumference of the hose should be such that it is not greater than twice the distance between the rear end wall 35 and the cover 43, so that the hose can lie flat on the support 48 in the crimped state without folds.
  • a flat tube consists of two flat webs 72, which are placed one on top of the other with their respective surfaces provided with a coating 74 and are connected to one another in their edge regions 75 by a seam 77.
  • a one-piece pre-formed plastic tube is even more advantageous.
  • Hose nozzles 95 adapted to the hose shape are advantageously used to connect such flat hoses to the suction nozzle 45 or the pressure nozzle 46 (FIGS. 9-11).
  • sealing lip 101 and 102 on its two longitudinal edges 99 and 100 (FIG. 12).
  • the sealing lips can be designed so that they seal only on one side or on two sides. Sealing on one side, namely from the higher pressure in the interior to the lower pressure in the suction space 38.1, is generally sufficient.
  • the separating part squeezes onto the hose 32 as flexibly as possible, it is advantageously provided with an elastic support 109 on its outside 108.
  • the separating part itself advantageously has a reinforcing insert. It is advantageously formed on its inside with a transverse corrugation, which contributes to the fact that barrier liquid is distributed evenly without sliding effect between the rollers 52 and the separating part 34 along the separating part. Instead, the rollers 52 can be one . Have cross corrugation. If instead of rollers 52 sliding squeeze bodies are used, it is advantageous to use a separating part 34 without corrugation so that these sliding bodies slide on a barrier liquid film on the separating part.
  • the separating part 34 does not have an elastic support 109, but instead the support 48 on the peripheral wall 37 is sufficiently elastic, it is advantageous to apply a transverse corrugation 97 on the outside 108 of the separating part 34, as shown in FIG. 1 .
  • This transverse corrugation leads to the hose between the support 48 and the roller 52 being pressed off at several points with the separating part 34 therebetween, so that a multiple seal against the inflow of fluid from the intermediate chamber 63.3 of the hose 30 is ensured.
  • the separating part can also be made narrower in the area of the pressure space 38.2 than in the area of the suction space 38.1, since it is no longer necessary to form a closed volume in the pressure space.
  • the suction space 38.1 is connected to a vacuum gauge 136.
  • a snifting valve 123 with an adjusting device 136 which allows air to pass from the pressure chamber 38.2 into the suction chamber 38.1 through a through opening 131. This allows the vacuum in the suction chamber 38.1 and thus the suction height of the pump to be set.
  • Each pulsation damper 137 consists of a molded body which is connected to the outside air via a feed line 141.
  • a pump according to the invention there is an inflatable pad 48.
  • the inflation takes place via line-shaped cavities 146 in the support. If the pad 48 is heavily inflated, the tube 32 between it and the separating part 34 is squeezed out completely at the location of a roller 32. If, however, the pad 48 is only slightly or not at all inflated, the hose is no longer squeezed sufficiently, as a result of which liquid can flow back from the pressure side to the suction side and thus the pump no longer delivers.
  • the cavities 146 are closed on one side by a sealing plug 147, while on the other side compressed air is supplied from a pressure accumulator 157 to each conduit-shaped cavity 146 via a collecting tube 152 and individual tubes 151. This receives compressed air via a pressure reducing valve 155 and a shut-off valve 156.
  • the compressed air required to inflate the support 48 according to the embodiment of FIGS. 17-20 can itself be obtained with a hose pump 30 designed according to FIGS. 21-23.
  • This hose pump has a secondary hose pump 177 with a secondary delivery hose 178, which runs along the inside of the separating part 34 from a secondary suction nozzle 181 to a secondary one ren pressure port 182 is installed.
  • a circumferential groove 179 is cut out, through which the secondary delivery hose 178 is guided. However, the groove is only so deep that the squeezed secondary delivery hose 178 has its place.
  • the pressure of the air can be adjusted by a valve 189 with adjusting screw 196.
  • the end of the support 48 located on the pressure side is designed as a pulsation damper 137 in the embodiment according to FIG. 21.
  • an open band can also be used as the separating part 34, which is firmly attached to the housing 31 at both ends.
  • any squeeze body can be used, even those that only slide, i.e. do not roll, whose axes are parallel and concentric to the rotor axis.
  • the quantity which can be conveyed can also easily be changed by replacing hoses which each have different cross sections. It is only necessary to ensure that the outer circumference of the tube corresponds at most to twice the distance between the two planar boundary walls. Such adjustment of the delivery rate through the use of hoses with different cross-sections is not possible with conventional peristaltic pumps, since the entire pump construction is adapted in terms of depth and diameter to the diameter of a specific hose.
  • the pump already works with a single squeeze body rotating inside the separating part.
  • at least two bodies are present for practical purposes.
  • Three or four squeeze bodies are advantageously used.

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

Abstract

A stricture pump (30) comprising a casing (31) containing a delivery hose (32), a rotor (33) and a band-like dividing member (34) which is substantially stable in respect of length, and which is fastened to a fastening part (53, 55, 57) outside the outermost periphery of the rotor, in such a manner as to be fixed to the casing, and in addition is disposed around the rotor. Together with the casing walls, the dividing member closes off sealingly a suction chamber (38.1). On the rotation of the rotor, this closed-off suction chamber is increased in size, whereby a negative pressure is produced in it. Fluid is thereby forced from a suction branch (45) into that portion of the hose which lies within the suction chamber. On the further rotation of the rotor, the fluid drawn in is pressed out of the hose by rollers (52) on the rotor, these rollers pressing by way of the dividing member (34) against the hose disposed between the dividing member and the peripheral wall (37) of the casing. The hose has substantially no restoring power of its own, and therefore draws in fluid not through its own restoring power but through the negative pressure in the suction chamber. A stricture pump of this kind can be operated at a very high speed of rotation, so that high output can be achieved.

Description

Technisches GebietTechnical field

Die Erfindung betrifft eine Schlauchpumpe, bei der im Innenraum eines Gehäuses in Richtung von einem Saugraum zu einem Druckraum ein Läufer umläuft, der auf einen zwischen einem Saugstutzen und einem Druckstutzen entlang einer Umfangswand des Gehäuses verlegten Schlauch drückt.The invention relates to a peristaltic pump in which a rotor rotates in the interior of a housing in the direction from a suction chamber to a pressure chamber and presses on a hose laid between a suction nozzle and a pressure nozzle along a peripheral wall of the housing.

Stand der TechnikState of the art

Aus der US-A-2899905 ist eine Schlauchpumpe bekannt, mit einem Gehäuse mit einer Umfangswand, die zumindest in einem Pumpabschnitt, der einen Saugraum mit einem Druckraum im Gehäuse verbindet, kreiszylindrisch ausgebildet ist, einer ebenen hinteren Stirnwand, die das Gehäuse auf seiner Rückseite verschließt, einer ebenen Vorderwand, die das Gehäuse an seiner Vorderseite verschließt, einem Saugstutzen, durch den das zu pumpende Fluid in den Saugraum gesaugt wird, und einem Druckstutzen, durch den das Fluid aus dem Druckraum gedrückt wird, einem Läufer der sich im Innenraum des Gehäuses in Richtung vom Saugraum zum Druckraum dreht, dessen Läuferachse mit der Zylinderachse des Pumpabschnittes zusammenfällt, und der mindestens einen Quetschkörper mit zur Läuferachse paralleler Quetschkörperachse aufweist, einem bandförmigen, im wesentlichen längenstabilen Trennteil, das um den Läufer gelegt ist und an der Vorderwand und der hinteren Stirnwand anliegt, einem Schlauch, der zwischen dem Saugstutzen und dem Druckstutzen entlang der Umfangswand zwischen dieser und dem Trennteil verlegt ist, dessen Umfang höchstens dem doppelten Abstand zwischen der hinteren Stirnwand und der Vorderwand entspricht, und einer Flüssigkeit im Inneraum des Gehäuses.From US-A-2899905 a peristaltic pump is known, with a housing with a peripheral wall, which is circular cylindrical at least in a pump section, which connects a suction chamber with a pressure chamber in the housing, a flat rear end wall, the housing on its back closes, a flat front wall, which closes the front of the housing, a suction nozzle through which the fluid to be pumped is sucked into the suction chamber, and a pressure nozzle through which the fluid is pressed out of the pressure chamber, a rotor which is located in the interior of the Rotates housing in the direction from the suction chamber to the pressure chamber, the rotor axis of which coincides with the cylinder axis of the pump section and which has at least one squeeze body with the squeezer body axis parallel to the rotor axis, a band-shaped, essentially length-stable separating part which is placed around the rotor and on the front wall and the abuts the rear bulkhead, a hose between the suction Tutz and the pressure port along the circumferential wall between this and the separating part is laid, the circumference corresponds to at most twice the distance between the rear end wall and the front wall, and a liquid in the interior of the housing.

Bei dieser Pumpe drückt ein Quetschkörper des Läufers nicht direkt, sondern über das zwischengelegte bandförmige Trennteil auf den Schlauch. Dadurch ist der Schlauch besser gegen Abnutzungen geschützt, die durch Kräfte bedingt sind, die der umlaufende Quetschkörper hervorruft. Die Flüssigkeit dient zum Schmieren der Pumpenteile, insbesondere auch des Trennteiles, das über seinen ganzen Umfang dicht an der Vorderwand und der hinteren Stirnwand anliegt.With this pump, a squeeze body of the rotor does not press directly on the hose, but rather via the interposed band-shaped separating part. As a result, the hose is better protected against wear caused by forces caused by the surrounding squeeze body. The liquid serves to lubricate the pump parts, in particular also the separating part, which lies tightly against the front wall and the rear end wall over its entire circumference.

Bei der genannten Pumpe erfolgt der Pumpvorgang dadurch, daß Flüssigkeit durch Zusammenquetschen des Schlauches aus diesem herausgepreßt wird. Neue Flüssigkeit wird dadurch zugeführt, daß der Schlauch über ein eigenes durch eine Feder noch verstärktes Rückstellvermögen verfügt, so daß sich sein Innenraum nach dem Zusammenquetschen wieder aufweitet, wodurch Flüssigkeit angesaugt wird.In the pump mentioned, the pumping process takes place in that liquid is pressed out of the hose by squeezing it together. New liquid is supplied in that the hose has its own resilience, which is reinforced by a spring, so that its interior widens again after being squeezed together, as a result of which liquid is sucked in.

Aus der GB-A-13 261 A. D. 1904 ist eine ähnlich aufgebaute Pumpe bekannt, bei der jedoch das Trennteil nicht an Wänden anliegt und es auch nicht durch eine Flüssigkeit geschmiert ist. Das Trennteil ist aber zwischen Druck- und Saugstutzen außerhalb dem äußersten Läuferumfang befestigt, was den Vorteil hat, daß das Trennteil nicht verrutscht und damit keine Reibungskräfte auf den Schlauch ausübt.From GB-A-13 261 A.D. 1904 a similarly constructed pump is known, in which, however, the separating part is not in contact with walls and is also not lubricated by a liquid. However, the separating part is fastened between the pressure and suction nozzle outside the outermost rotor circumference, which has the advantage that the separating part does not slip and thus does not exert any frictional forces on the hose.

Von anderen Pumpen her ist es bekannt, den Ansaugvorgang durch Vakuum zu unterstützen. So verfügt z. B. eine in US-A-3180 272 beschriebene Schlauchpumpe über eine gesonderte Vakuumpumpe, durch die das Gehäuse, in dem sich der Schlauch befindet, evakuiert wird.It is known from other pumps to support the suction process by means of vacuum. So z. B. a peristaltic pump described in US-A-3180 272 via a separate vacuum pump through which the housing in which the hose is located is evacuated.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde eine Schlauchpumpe anzugeben, die einen einfachen Aufbau aufweist, und bei der der Pumpvorgang durch Vakuum unterstützt wird.The invention has for its object to provide a peristaltic pump which has a simple structure and in which the pumping process is supported by vacuum.

Die Erfindung ist durch die Merkmale des Hauptanspruchs gegeben. Sie zeichnet sich dadurch aus, daß bei einer Pumpe der eingangs genannten Gattung das Trennteil zumindest in seinem Saugraumabschnitt eine solche Breite aufweist, daß es beim Drehen des Läufers zumindest mit seinem Saugraumabschnitt durch die genannte Flüssigkeit abgedichtet gegenüber der hinteren Stirnwand und der Vorderwand hin-und hergeschoben wird, und im Innenraum zwischen Druckraum und Saugraum gehäusefest an einem Befestigungsteil. außerhalb dem äußersten Läuferumfang befestigt ist, das den Saugraum vom Druckraum trennt, und der Schlauch im wesentlichen über kein eigenes Rückstellvermögen verfügt.The invention is given by the features of the main claim. It is characterized in that, in a pump of the type mentioned at the outset, the separating part has such a width, at least in its suction chamber section, that when the rotor rotates, it is sealed off from the rear end wall and the front wall at least with its suction chamber section by the liquid mentioned is pushed, and in the interior between the pressure chamber and suction chamber fixed to a fastening part. is attached outside the outermost rotor circumference, which separates the suction chamber from the pressure chamber, and the hose essentially does not have its own resilience.

Die erfindungsgemäße Pumpe ist also eine vakuumunterstützte Schlauchpumpe, die sich das zum Ansaugen der zu pumpenden Flüssigkeit erforderliche Vakuum selbst erzeugt. Ein besonderer Vorteil ist dabei der, daß das Vakuum nur im Saugraum, nicht aber auch im Druckraum erzeugt wird. Im Druckraum brauchen die Quetschkörper also den Schlauch nicht entgegen einer Unterdruckkraft zusammenzuquetschen.The pump according to the invention is therefore a vacuum-assisted peristaltic pump which generates the vacuum required for drawing in the liquid to be pumped. A particular advantage is that the vacuum is only generated in the suction chamber, but not in the pressure chamber. In the pressure chamber, the squeeze bodies do not need to squeeze the hose against a negative pressure force.

Eine vakuumunterstützte Schlauchpumpe, die sich ihr Vakuum selbst erzeugt, ist auch aus der FR-A-1 394 047 bekannt. Bei dieser ist der Saugraum mit dem Innenraum des Gehäuses über ein Einstellventil verbunden, mit Hilfe dessen sich das Ausmaß des Unterdrucks im Innenraum des Gehäuses einstellen läßt. Da der gesamte Innenraum des Gehäuses evakuiert wird, wirkt der Unterdruck auch im Druckraum, so daß beim Auspressen der Flüssigkeit aus dem Schlauch die Quetschkörper den Schlauch im Druckraum entgegen der Kraft des Unterdrucks zusammendrücken müssen.A vacuum-assisted peristaltic pump that generates its own vacuum is also known from FR-A-1 394 047. In this case, the suction chamber is connected to the interior of the housing via an adjusting valve, with the aid of which the extent of the negative pressure in the interior of the housing can be adjusted. Since the entire interior of the housing is evacuated, the negative pressure also acts in the pressure chamber, so that when the liquid is squeezed out of the hose, the squeeze bodies have to compress the hose in the pressure chamber against the force of the negative pressure.

Das Erzeugen eines Unterdrucks mit Hilfe eines bandförmigen Trennteiles entsprechend dem Trennteil der erfindungsgemäßen Schlauchpumpe ist aus AT-B-179 971 bekannt. Es handelt sich dabei allerdings um keine Schlauchpumpe. Pumpen, die lediglich ein bandförmiges Trennteil aufweisen, haben sich wegen verschiedener Probleme am Markt nicht durchgesetzt.The generation of a negative pressure with the aid of a band-shaped separating part corresponding to the separating part of the hose pump according to the invention is known from AT-B-179 971. However, this is not a peristaltic pump. Pumps that only have a band-shaped separating part have not become established due to various problems on the market.

Eine erfindungsgemäße Pumpe für eine Förderleistung von etwa 30 000 I/h wiegt nur etwa 30 kg, während eine herkömmliche Schlauchpumpe mit zusätzlicher Vakuumpumpe für dieselbe Fördermenge etwa das fünffache wiegt. Die Pumpe läuft mit etwa 400 U/min., während eine herkömmliche vakuumunterstützte Pumpe mit etwa 30-100 U/min. läuft. Die leichtere Ausführung und die höhere Laufgeschwindigkeit rühren daher, daß bei der erfindungsgemäßen Pumpe Vakuum nur im Saugraum, nicht aber auch im Druckraum erzeugt wird. Der Läufer und die Lagerung für den Läufer und somit das gesamte Gehäuse können daher leichter ausgebildet werden.A pump according to the invention for a delivery rate of about 30,000 l / h weighs only about 30 kg, while a conventional peristaltic pump with an additional vacuum pump weighs about five times for the same delivery rate. The pump runs at around 400 rpm, while a conventional vacuum-assisted pump runs at around 30-100 rpm. running. The lighter design and the higher running speed result from the fact that, in the pump according to the invention, vacuum is only generated in the suction space, but not also in the pressure space. The rotor and the bearing for the rotor and thus the entire housing can therefore be made lighter.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung wird anhand von Ausführungsbeispielen gemäß den folgenden Figuren näher erläutert. Es zeigen :

  • Figur 1 einen Schnitt durch eine Grundausführungsform einer Schlauchpumpe. rechtwinklig zur Pumpenachse ;
  • Figur 2 einen Schnitt durch die Pumpe gemäß Fig. 1 ;
  • Figur 3 eine Vorderansicht auf die Pumpe gemäß den Fig. 1 und 2 in Blickrichtung der Pumpenachse ;
  • Figuren 4.1 bis 4.4 schematische Ansichten in Blickrichtung der Pumpenachse auf wesentliche Teile der Pumpe, zum Erläutern von deren Funktion ;
  • Figuren 5 bis 8 Längs- bzw. Querschnitte durch verschiedene Schläuche ;
  • Figuren 9 bis 11 Ausführungsformen von Anschlußstutzen für ovale Schläuche ;
  • Figuren 12 bis 14 Quer- bzw. Längsschnitte durch Ausführungsformen von Trennteilen ;
  • Figur 15 einen Schnitt parallel zur Pumpe-. nachse durch einen Deckel mit nachgiebigem Wandbereich ;
  • Figur 16 einen Schnitt gemäß Fig. 1, jedoch durch eine Pumpe mit Pulsationsdämpfern und einem Schnüffelventil ;
  • Figuren 17 bis 20 Schnitte durch eine Pumpenauflage mit einstellbarem Auflagedruck ;
  • Figur 21 Schnitt (gemäß Fig. 1) durch eine Ausführungsform einer Pumpe mit sekundärer Schlauchpumpe ;
  • Figur 22 Querschnitt durch wesentliche Teile der sekundären Schlauchpumpe der Pumpe gemäß Fig. 21, parallel zur Pumpenachse ;
  • Figur 23 Schnitt gemäß Fig. 2 durch die Pumpe gemäß Fig. 21.
The invention is explained in more detail using exemplary embodiments according to the following figures. Show it :
  • 1 shows a section through a basic embodiment of a peristaltic pump. perpendicular to the pump axis;
  • Figure 2 shows a section through the pump of FIG. 1;
  • Figure 3 is a front view of the pump of Figures 1 and 2 in the direction of the pump axis.
  • Figures 4.1 to 4.4 are schematic views in the direction of the pump axis on essential parts of the pump, to explain its function;
  • Figures 5 to 8 longitudinal or cross sections through different hoses;
  • Figures 9 to 11 embodiments of connecting pieces for oval tubes;
  • Figures 12 to 14 cross and longitudinal sections through embodiments of partitions;
  • Figure 15 shows a section parallel to the pump. through a cover with a flexible wall area;
  • FIG. 16 shows a section according to FIG. 1, but through a pump with pulsation dampers and a sniffer valve;
  • Figures 17 to 20 sections through a pump support with adjustable contact pressure;
  • FIG. 21 section (according to FIG. 1) through an embodiment of a pump with a secondary peristaltic pump;
  • FIG. 22 cross section through essential parts of the secondary peristaltic pump of the pump according to FIG. 21, parallel to the pump axis;
  • FIG. 23 section according to FIG. 2 through the pump according to FIG. 21.

Wege zum Ausführen der ErfindungWays of Carrying Out the Invention

Die Schlauchpumpe 30 des Ausführungsbeispieles gemäß den Fig. 1-3 weist als Hauptbauteile ein Gehäuse 31 und in dessen Innenraum einen Förderschlauch 32, einen Läufer 33 und ein Trennteil 34 auf.The peristaltic pump 30 of the exemplary embodiment according to FIGS. 1-3 has, as main components, a housing 31 and in the interior of which a delivery hose 32, a runner 33 and a separating part 34.

Das Gehäuse 31 hat äußerlich angenähert die Form einer zylindrischen Scheibe mit einer hinteren Stirnwand 35, einer aus einer vorderen Stirnwand 36 und einem Deckel 43 gebildeten Vorderwand und einer Umfangswand 37, durch welche Wände ein Innenraum 38 eingeschlossen ist.The housing 31 has approximately the shape of a cylindrical disk with a rear end wall 35, a front wall formed from a front end wall 36 and a cover 43 and a peripheral wall 37, through which walls an interior 38 is enclosed.

Der obere Abschnitt der Umfangswand 37 ist eben ausgebildet, und in diesen Abschnitt sind zwei Stutzen eingesetzt, von denen im folgenden der jeweils linke als Saugstutzen 45 und der jeweils rechte als Druckstutzen 46 bezeichnet wird. Welcher Stutzen als Saugstutzen und welcher als Druckstutzen wirkt, hängt allerdings von der Drehrichtung des Läufers 33 ab. An den beiden Stutzen 45 und 46 ist der Schlauch 32 mit Schlauchklemmen 47 leicht auswechselbar befestigt. Der Schlauch 32 ist entlang der Umfangswand 37 verlegt.The upper section of the circumferential wall 37 is flat, and two nozzles are inserted into this section, of which the left one is called the suction nozzle 45 and the right one is called the pressure nozzle 46. Which spigot acts as a suction spigot and which acts as a pressure spigot depends on the direction of rotation of the rotor 33. The hose 32 is fastened to the two connecting pieces 45 and 46 with hose clamps 47 so that they can be replaced easily. The hose 32 is laid along the peripheral wall 37.

Der Läufer 33 ist in einem Lagergehäuse 39 gelagert, das mit der hinteren Stirnwand 35 verbunden ist. Das Lagergehäuse kann auch fehlen, wenn der Läufer direkt auf die Welle eines Antriebsmotores aufgesetzt ist. Der Läufer 33 ist dreiecksförmig ausgebildet, mit jeweils einem Laufrollenpaar 52 an den Eckpunkten.The rotor 33 is mounted in a bearing housing 39 which is connected to the rear end wall 35. The bearing housing can also be missing if the rotor is placed directly on the shaft of a drive motor. The rotor 33 is triangular, each with a pair of rollers 52 at the corner points.

Um den Läufer 33 ist das Trennteil 34 gelegt, das mit dem Gehäuse 31 dadurch fest verbunden ist, daß es zwischen eine Befestigungsrippe 53 am Gehäuse und einen durch eine Klemmschraube 57 anziehbaren Klemmkörper 55 gespannt ist. Der Klemmkörper 55 ist abgerundet, so daß es auch dann, wenn es sich hin- und herbewegt, nicht abknicken kann. Wie aus Fig. 2 erkennbar ist, ist die Breite des Trennteiles 34 so gewählt, daß es den Abstand zwischen der hinteren Stirnwand 35 und dem Deckel 43 überbrückt. Das Trennteil 34 ist bandförmig und im wesentlichen längenstabil.Around the rotor 33, the separating part 34 is placed, which is firmly connected to the housing 31 in that it is stretched between a fastening rib 53 on the housing and a clamping body 55 which can be tightened by a clamping screw 57. The clamping body 55 is rounded so that it cannot kink even when it moves back and forth. As can be seen from FIG. 2, the width of the separating part 34 is selected such that it bridges the distance between the rear end wall 35 and the cover 43. The separating part 34 is band-shaped and essentially stable in length.

In ihrem unteren, dem ebenen Stutzenanschlußbereich der Umfangswand 37 gegenüberliegenden Abschnitt ist die Umfangswand 37 kreiszylinderförmig ausgebildet, wobei die Mittelachse dieses kreiszylinderförmigen Pumpabschnittes mit der Mittelachse des Läufers 33 zusammenfällt. Der Pumpabschnitt erstreckt sich über mindestens einen halben Kreiszylinder.In its lower section, which is opposite the flat connecting piece region of the peripheral wall 37, the peripheral wall 37 is designed in the shape of a circular cylinder, the central axis of this circular-cylindrical pump section coinciding with the central axis of the rotor 33. The pump section extends over at least half a circular cylinder.

Auf dem Pumpabschnitt der Umfangswand 37 ist eine elastische Auflage 48 aufgebracht. Die Dicke der Auflage 48 ist so bemessen, daß der Schlauch 32 dann ganz zwischen dem Trennteil 34 und der Auflage 48 abgedrückt wird, wenn ein Laufrollenpaar 52 im Inneren des Trennteiles 34 entlang dem Pumpabschnitt vorbeiläuft.An elastic pad 48 is applied to the pump section of the peripheral wall 37. The thickness of the support 48 is dimensioned such that the hose 32 is then pushed completely between the separating part 34 and the support 48 when a pair of rollers 52 runs inside the separating part 34 along the pump section.

Im Innenraum des Gehäuses, insbesondere in dem vom Trennteil 34 umschlossenen Raum, ist eine (nicht dargestellte) Sperrflüssigkeit vorhanden. Diese wird durch ein Einfülloch mit Einfüllschraube 87 im Deckel 43 so weit eingefüllt, bis an der Stelle einer herausgeschraubten Kontrollschraube 88 in der Mitte des Deckels die Flüssigkeit austritt. Dann werden die Kontrollschraube 88 und die Einfüllschraube 87 wieder eingeschraubt.A barrier liquid (not shown) is present in the interior of the housing, in particular in the space enclosed by the separating part 34. This is filled through a filler hole with filler screw 87 in the cover 43 until the liquid escapes at the location of a screwed-out control screw 88 in the middle of the cover. Then the control screw 88 and the filler screw 87 are screwed in again.

Die Funktion der Pumpe gemäß den Fig. 1-3 wird nun an Hand der Ablaufbilder gemäß den Fig. 4.1-4.4 näher erläutert. Es wird davon ausgegangen, daß sich der Läufer 33 im Gegenuhrzeigersinn, also in Richtung des Pfeiles 64 von Fig. 1 dreht. Bei der Stellung gemäß Fig. 4.1 hat sich der Läufer so weit verdreht, daß eines seiner Laufrollenpaare 52, das im folgenden als erstes Paar 52.1 bezeichnet wird, gerade den vom Saugstutzen 45 herkommenden Schlauchteil ganz abpreßt. Durch die Gehäusewandungen und das Trennteil 34 ist dann ein Teil des Innenraumes 38 abgetrennt, der im folgenden als Saugraum 38.1 bezeichnet wird. Im Schlauch 34 ist zwischen dem Saugstutzen und der Abquetschstelle eine Saugkammer 63.1 ausgebildet. Durch das in Drehrichtung folgende Rollenpaar 52.2 ist der Schlauch 32 an einer weiteren Stelle abgequetscht. Die vom Schlauch eingeschlossene Kammer zwischen dieser zweiten Abquetschstelle und dem Druckstutzen 46 wird im folgenden als Druckkammer 63.2 bezeichnet. Der von den Gehäusewandungen und dem Trennteil 34 umgebene Raum, der mit der Umgebungsluft über eine Entlüftungsöffnung 93 im ebenen Abschnitt der Umfangswand 37 in Verbindung steht, wird im folgenden als Druckraum 38.2 bezeichnet. Das vom Schlauch abgeschlossene Volumen zwischen dem ersten Rollenpaar 52.1 und dem zweiten Paar 52.2 wird als Zwischenkammer 63.3 bezeichnet. Das Volumen dieser Zwischenkammer bleibt beim Drehen des Läufers unverändert.The function of the pump according to FIGS. 1-3 is now explained in more detail using the flow diagrams according to FIGS. 4.1-4.4. It is assumed that the rotor 33 rotates counterclockwise, that is to say in the direction of the arrow 64 in FIG. 1. In the position shown in FIG. 4.1, the runner has rotated so far that one of its pairs of rollers 52, which will be referred to as the first pair 52.1 in the following, just squeezes the hose part originating from the suction port 45 completely. A part of the interior 38 is then separated by the housing walls and the separating part 34, which is referred to below as the suction space 38.1. A suction chamber 63.1 is formed in the hose 34 between the suction nozzle and the squeezing point. The hose 32 is squeezed off at a further point by the pair of rollers 52.2 following in the direction of rotation. The chamber enclosed by the hose between this second squeezing point and the pressure port 46 is referred to below as the pressure chamber 63.2. The space surrounded by the housing walls and the separating part 34, which is in communication with the ambient air via a ventilation opening 93 in the flat section of the peripheral wall 37, is referred to below as the pressure space 38.2. The volume enclosed by the hose between the first pair of rollers 52.1 and the second pair 52.2 is referred to as the intermediate chamber 63.3. The volume of this intermediate chamber remains unchanged when the rotor is turned.

Dreht sich der Läufer in Gegenuhrzeigerrichtung weiter und nimmt dann die Stellung gemäß Fig. 4.2 ein, so hat sich das Volumen des Saugraumes 38.1 vergrößert. Da dieser Raum durch die Gehäusewandungen und das Trennteil 34 dicht abgeschlossen ist, ist in ihm ein Unterdruck entstanden. Dieser Unterdruck führt dazu, daß der im wesentlichen schlaffe Schlauch 32 durch nachrückendes Fluid abgebläht wird, sich also das Volumen der Saugkammer 63.1 vergrößert. Gleichzeitig hat sich das Volumen der Druckkammer 63.2 durch das in Richtung zum Druckstutzen 46 entlang der Umfangswand rollende zweite Laufrollenpaar 52.2 verkleinert. Die Pumpe hat also über den Saugstutzen 45 Fluid angesaugt und über den Druckstutzen 46 Fluid abgegeben.If the rotor continues to rotate in the counterclockwise direction and then assumes the position according to FIG. 4.2, the volume of the suction space 38.1 has increased. Since this space is sealed off by the housing walls and the separating part 34, a negative pressure has developed in it. This negative pressure leads to the substantially flaccid hose 32 being blown up by the advancing fluid, thus increasing the volume of the suction chamber 63.1. At the same time, the volume of the pressure chamber 63.2 has decreased due to the second pair of rollers 52.2 rolling along the peripheral wall in the direction of the pressure port 46. The pump has therefore sucked in fluid 45 via the suction nozzle and dispensed fluid 46 via the pressure nozzle.

Beim Weiterdrehen wird schließlich die in Fig. 4.3 dargestellte Stellung erreicht, in der das zweite Laufrollenpaar 52.2 kurz vor dem Abheben von der Umfangswand steht, und das dritte Laufrollenpaar 52.3 dazu ansetzt, den Schlauch im Bereich der Saugkammer 63.1 erneut abzudrücken. In der Stellung gemäß Fig. 4.4 befindet sich nur noch das erste Rollenpaar 52.1 in Anlage mit der Umfangswand, so daß keine Zwischenkammer 63.3 mehr abgeschlossen ist. Die Pumpe steht kurz vor dem Anfangszustand gemäß Fig. 4.1, bei dessen Erreichen jedoch das dritte Rollenpaar 52.3 die Funktion des Rollenpaares 52.1 gemäß Fig. 4.1 übernimmt.When turning further, the position shown in FIG. 4.3 is finally reached, in which the second pair of rollers 52.2 stands just before lifting off the peripheral wall, and the third pair of rollers 52.3 starts to press the hose again in the area of the suction chamber 63.1. In the position according to FIG. 4.4, only the first pair of rollers 52.1 is in contact with the peripheral wall, so that no intermediate chamber 63.3 is closed. The pump is close to the initial state according to FIG. 4.1, but when it is reached the third pair of rollers 52.3 takes over the function of the pair of rollers 52.1 according to FIG. 4.1.

Auf der Druckseite wirkt die Schlauchpumpe 30 also wie eine herkömmliche Schlauchpumpe, bei der durch einen Quetschkörper Fluid aus einem Schlauch herausgedrückt wird. Auf der Saugseite jedoch funktioniert die Pumpe 30 so, daß sie mit Hilfe des Trennteiles 34 einen sich beim Drehen des Läufers 33 vergrößernden Saugraum 38.1 bildet, in dem der Druck immer weiter abfällt, so daß er schließlich kleiner wird als der Druck in der Saugkammer 63.1 des Förderschlauches 32, wodurch zu pumpendes Fluid in die Saugkammer 63.1 eingedrückt wird.On the pressure side, the hose pump 30 thus acts like a conventional hose pump, in which fluid is pressed out of a hose by a squeeze body. On the suction side, however, the pump 30 functions in such a way that, with the help of the separating part 34, it forms a suction space 38.1 that increases when the rotor 33 rotates, in which the pressure drops further and further, so that it finally becomes lower than the pressure in the suction chamber 63.1 of the delivery hose 32, whereby fluid to be pumped is pressed into the suction chamber 63.1.

Für die Funktion der Pumpe kommt es also wesentlich auf den unterdruckdichten Abschluß zwischen Trennteil 34 und hinterer Stirnwand 35 und Deckel 43 an, wozu die eingangs genannte Sperrflüssigkeit innerhalb des Trennteiles 34 dient. Diese Sperrflüssigkeit wird jedoch teilweise in den Saugraum 38.1 gesogen und gelangt beim Drehen des Läufers 33 in den Druckraum 38.2. Damit die Sperrflüssigkeit dann wieder in den vom Trennteil 34 umschlossenen Raum zurückkehrt, weist die Pumpe 30 eine Übertrittsöffnung 85 im Gehäusedeckel im Bereich des Druckraumes 38.2, eine weitere Übertrittsöffnung 86 in der Mitte des Deckels und einen die beiden Öffnungen verbindenden Übertrittskanal 81 auf. Am Läufer 33 sind flügelförmige Rippen 78 vorhanden, die die wieder eingeführte Sperrflüssigkeit an die Innenseite des Trennteiles 34 spritzen, damit die Sperrflüssigkeit dort wieder ihre Dichtfunktion ausüben kann.For the function of the pump, the vacuum-tight seal between the separating part 34 and the rear end wall 35 and the cover 43 is essential, for which purpose the sealing liquid mentioned at the beginning inside the separating part 34 is used. However, this barrier liquid is partially sucked into the suction space 38.1 and reaches the pressure space 38.2 when the rotor 33 is rotated. So that the barrier liquid then returns to the space enclosed by the separating part 34, the pump 30 has a transfer opening 85 in the housing cover in the area of the pressure chamber 38.2, a further transfer opening 86 in the middle of the cover and a transfer channel 81 connecting the two openings. Wing-shaped ribs 78 are provided on the rotor 33, which inject the reintroduced barrier liquid onto the inside of the separating part 34 so that the barrier liquid can again perform its sealing function there.

Zum Wechseln eines Schlauches 32 wird die Sperrflüssigkeit durch Öffnen des Deckels 43 durch Entfernen von Schrauben 89 abgelassen, die Schlauchklemmen 47 werden gelöst, der abgenutzte Schlauch wird entfernt, und dann erfolgt das Anbringen eines neuen Schlauches in umgekehrter Reihenfolge. Der Deckel kann dann auch um 90° versetzt wieder aufgesetzt werden, wenn die Pumpe in anderer Drehrichtung, nun also in Uhrzeigerrichtung verwendet werden soll. Durch das Drehen des Deckels ist gewährleistet, daß der Übertrittkanal 81 wieder die Verbindung zwischen dem Druckraum 38.2 und dem mittleren Raum herstellt. Die verdrehte Stellung ist in Fig. 3 strichpunktiert eingezeichnet, ebenso wie die Richtungen des gepumpten Fluids strichpunktiert dargestellt sind.To change a hose 32, the sealing liquid is drained by opening the cover 43 by removing screws 89, the hose clamps 47 are loosened, the worn hose is removed, and then a new hose is attached in the reverse order. The cover can then be replaced with a 90 ° offset if the pump is to be used in a different direction of rotation, i.e. clockwise. By turning the cover it is ensured that the transfer channel 81 again establishes the connection between the pressure space 38.2 and the middle space. The rotated position is shown in dash-dot lines in FIG. 3, as are the directions of the pumped fluid in dash-dot lines.

Der Förderschlauch 32 ist z. B. ein normaler Kunststoffschlauch. Er kann aber auch durch . eine stabile Textilaußenhaut 66 mit einer Kunststoffinnenbeschichtung 67 gebildet sein, die gegen das zu pumpende Fluid resistent ist (Fig. 5). Der Förderschlauch 32 kann auch aus einem Textilaußenschlauch 68,'der im wesentlichen die auftretenden Unterdruckkräfte aufnimmt, und einem wenig stabilen, resistenten Innenschlauch 69 bestehen (Fig. 6, 7). Die Schläuche sind vorteilhafterweise jeweils so mit Anschlußstücken mittels Schlauchklemmen verbunden, daß sie sich von den Anschlußstücken lösen und damit wechseln lassen, ohne den Deckel der Pumpe zu öffnen.The conveyor hose 32 is, for. B. a normal plastic hose. But he can also by. a stable textile outer skin 66 can be formed with a plastic inner coating 67 which is resistant to the fluid to be pumped (FIG. 5). The conveying hose 32 can also consist of a textile outer hose 68, which essentially absorbs the negative pressure forces that occur, and an unstable, resistant inner hose 69 (FIGS. 6, 7). The hoses are advantageously each connected to fittings by means of hose clamps in such a way that they can be detached from the fittings and thus replaced without opening the pump cover.

Es ist zu beachten, daß bei einer Schlauchpumpe die größten Kräfte auf den Schlauch an dessen flachgequetschten Rändern auftreten. Es wird daher vorgeschlagen, einen in der zusammengequetschten Form vorgeformten Schlauch zu verwenden. Das Aufbiegen des Schlauches erstreckt sich dann im wesentlichen über seinen ganzen Umfang, so daß der stark gekrümmte Bereich weniger belastet ist als im umgekehrten Fall, wo ein kreisrunder Schlauch an den eng definierten Grenzen stark zu quetschen ist. Der Umfang des Schlauches ist in jedem Fall so zu bemessen, daß er nicht größer ist als der doppelte Abstand zwischen der hinteren Stirnwand 35 und dem Deckel 43, damit der Schlauch in gequetschtem Zustand ohne Falten flach auf der Auflage 48 liegen kann. Eine Ausführungsform eines flachen Schlauches besteht aus zwei Flächenbahnen 72, die mit ihren jeweils mit einer Beschichtung 74 versehenen Flächen aufeinandergelegt sind und in ihren Randbereichen 75 durch eine Naht 77 miteinander verbunden sind. Noch vorteilhafter ist jedoch ein einstückig vorgeformter Plastikschlauch. Zum Anschließen solcher flacher Schläuche an den Saugstutzen 45 oder den Druckstutzen 46 werden vorteilhafterweise an die Schlauchform angepaßte Schlauchtüllen 95 verwendet (Fig. 9-11).It should be noted that with a peristaltic pump the greatest forces are exerted on the tube at its squashed edges. It it is therefore proposed to use a tube preformed in the crimped form. The bending of the tube then extends essentially over its entire circumference, so that the strongly curved area is less stressed than in the opposite case, where a circular tube is to be squeezed at the narrowly defined limits. In any case, the circumference of the hose should be such that it is not greater than twice the distance between the rear end wall 35 and the cover 43, so that the hose can lie flat on the support 48 in the crimped state without folds. One embodiment of a flat tube consists of two flat webs 72, which are placed one on top of the other with their respective surfaces provided with a coating 74 and are connected to one another in their edge regions 75 by a seam 77. However, a one-piece pre-formed plastic tube is even more advantageous. Hose nozzles 95 adapted to the hose shape are advantageously used to connect such flat hoses to the suction nozzle 45 or the pressure nozzle 46 (FIGS. 9-11).

Damit das Trennteil 34 gut gegen die hintere Stirnwand 35 und den Deckel 43 abdichtet, ist es vorteilhafterweise an seinen beiden Längsrändern 99 und 100 mit jeweils einer Dichtlippe 101 bzw. 102 versehen (Fig. 12). Die Dichtlippen können so ausgebildet sein, daß sie nur nach einer Seite oder auch nach zwei Seiten abdichten. Die Abdichtung nach einer Seite, nämlich vom höheren Druck im Innenraum her zum niedrigeren Druck im Saugraum 38.1 hin ist im allgemeinen ausreichend.So that the separating part 34 seals well against the rear end wall 35 and the cover 43, it is advantageously provided with a sealing lip 101 and 102 on its two longitudinal edges 99 and 100 (FIG. 12). The sealing lips can be designed so that they seal only on one side or on two sides. Sealing on one side, namely from the higher pressure in the interior to the lower pressure in the suction space 38.1, is generally sufficient.

Damit das Trennteil möglichst elastisch auf den Schlauch 32 quetscht, wird es vorteilhafterweise mit einer elastischen Auflage 109 auf seiner Außenseite 108 versehen. Das Trennteil selbst weist vorteilhafterweise eine verstärkende Einlage auf. Vorteilhafterweise ist es auf seiner Innenseite mit einer Querriffelung ausgebildet, die dazu beiträgt, daß Sperrflüssigkeit gleichmäßig ohne Gleiteffekt zwischen den Laufrollen 52 und dem Trennteil 34 entlang dem Trennteil verteilt wird. Stattdessen können auch die Rollen 52 eine .Querriffelung aufweisen. Werden statt Laufrollen 52 gleitende Quetschkörper verwendet, so ist es dagegen von Vorteil, ein Trennteil 34 ohne Riffelung zu verwenden, damit diese Gleitkörper auf einem Sperrflüssigkeitsfilm auf dem Trennteil gleiten. Verfügt das Trennteil 34 über keine elastische Auflage 109, sondern ist allein die Auflage 48 auf der Umfangswand 37 ausreichend elastisch ausgebildet, so ist es von Vorteil, auf der Außenseite 108 des Trennteiles 34 eine Querriffelung 97 anzubringen, wie sie in Fig. 1 dargestellt ist. Diese Querriffelung führt dazu, daß der Schlauch zwischen Auflage 48 und Rolle 52 mit dazwischenliegendem Trennteil 34 an mehreren Stellen abgedrückt wird, so daß eine Mehrfachdichtung gegen Nachströmen von Fluid aus der Zwischenkammer 63.3 des Schlauches 30 gewährleistet ist. Das Trennteil kann im Bereich des Druckraumes 38.2 auch schmäler ausgebildet sein als im Bereich des Saugraumes 38.1, da im Druckraum kein abgeschlossenes Volumen mehr auszubilden ist. Durch ein im Druckraumabschnitt verschmälertes Trennteil 34 ist auch gewährleistet, daß in den Druckraum geförderte Sperrflüssigkeit wieder leicht in den vom Trennteil 34 umgebenen Raum eintreten kann.So that the separating part squeezes onto the hose 32 as flexibly as possible, it is advantageously provided with an elastic support 109 on its outside 108. The separating part itself advantageously has a reinforcing insert. It is advantageously formed on its inside with a transverse corrugation, which contributes to the fact that barrier liquid is distributed evenly without sliding effect between the rollers 52 and the separating part 34 along the separating part. Instead, the rollers 52 can be one . Have cross corrugation. If instead of rollers 52 sliding squeeze bodies are used, it is advantageous to use a separating part 34 without corrugation so that these sliding bodies slide on a barrier liquid film on the separating part. If the separating part 34 does not have an elastic support 109, but instead the support 48 on the peripheral wall 37 is sufficiently elastic, it is advantageous to apply a transverse corrugation 97 on the outside 108 of the separating part 34, as shown in FIG. 1 . This transverse corrugation leads to the hose between the support 48 and the roller 52 being pressed off at several points with the separating part 34 therebetween, so that a multiple seal against the inflow of fluid from the intermediate chamber 63.3 of the hose 30 is ensured. The separating part can also be made narrower in the area of the pressure space 38.2 than in the area of the suction space 38.1, since it is no longer necessary to form a closed volume in the pressure space. By a verschmälertes in the pressure chamber portion separating portion 34 is also ensured that conveyed into the pressure chamber barrier f lüssigkeit can easily enter the space surrounded by the partition member 34 space again.

Um Breitenänderungen des Trennteils bei Erwärmung, z. B. beim Pumpen von heißen Flüssigkeiten, auszugleichen, ist es von Vorteil, den Deckel 43 mehrschichtig auszubilden, nämlich mit einer elastischen Zwischenlage 116 und einer Metallplatte 115, an der das Trennteil 34 entlanggleitet (Fig. 15).To change the width of the separating part when heated, e.g. B. when pumping hot liquids, it is advantageous to design the cover 43 in multiple layers, namely with an elastic intermediate layer 116 and a metal plate 115 on which the separating part 34 slides (Fig. 15).

Der Saugraum 38.1 ist bei der Ausführungsform gemäß Fig. 16 mit einem Unterdruckmesser 136 verbunden. Weiterhin ist ein Schnüffelventil 123 mit Einstellvorrichtung 136 vorhanden, das Luft durch eine Durchgangsöffnung 131 vom Druckraum 38.2 in den Saugraum 38.1 übertreten läßt. Dadurch läßt sich der Unterdruck im Saugraum 38.1 und damit die Saughöhe der Pumpe einstellen. Weiterhin sind zwei Pulsationsdämpfer 137 vorhanden, und zwar jeweils einer nahe dem Anschlußstutzen bzw. dem Saugstutzen. Jeder Pulsationsdämpfer 137 besteht aus einem Formkörper, der über eine Zuleitung 141 mit der Außenluft in Verbindung steht.In the embodiment according to FIG. 16, the suction space 38.1 is connected to a vacuum gauge 136. There is also a snifting valve 123 with an adjusting device 136, which allows air to pass from the pressure chamber 38.2 into the suction chamber 38.1 through a through opening 131. This allows the vacuum in the suction chamber 38.1 and thus the suction height of the pump to be set. There are also two pulsation dampers 137, one each close to the connecting piece and the suction piece. Each pulsation damper 137 consists of a molded body which is connected to the outside air via a feed line 141.

Bei jeder Schlauchpumpe besteht der Wunsch, das Fördern der Pumpe trotz umlaufendem Läufer stoppen zu können. Dies läßt sich bei einer erfindungsgemäßen Pumpe entweder durch die Einstellvorrichtung 135, wie bereits beschrieben, verwirklichen, oder durch eine Ausführungsform, wie sie nun an Hand den Fig. 17-20 erläutert wird. Bei dieser Ausführungsform liegt eine aufpumpbare Auflage 48 vor. Das Aufpumpen erfolgt über leitungsförmige Hohlräume 146 in der Auflage. Ist die Auflage 48 stark aufgepumpt, so wird der Schlauch 32 zwischen ihr und dem Trennteil 34 an der Stelle einer Laufrolle 32 voll abgequetscht. Wird die Auflage 48 dagegen nur schwach oder sogar gar nicht aufgepumpt, so wird der Schlauch nicht mehr ausreicht gequetscht, wodurch Flüssigkeit von der Druckseite zur Saugseite zurückstromen kann und damit die Pumpe nicht mehr fördert. Die Hohlräume 146 sind bei der dargestellten Ausführungsform auf einer Seite durch einen Verschlußstopfen 147 verschlossen, während auf der anderen Seite über ein Sammelrohr 152 und einzelne Röhrchen 151 jedem leitungsförmigen Hohlraum 146 Druckluft von einem Druckspeicher 157 zugeführt wird. Dieser erhält Druckluft über ein Druckminderventil 155 und ein Absperrventil 156.With every peristaltic pump there is a desire to be able to stop pumping despite the rotating rotor. In a pump according to the invention, this can be achieved either by the setting device 135, as already described, or by an embodiment, as will now be explained with reference to FIGS. 17-20. In this embodiment, there is an inflatable pad 48. The inflation takes place via line-shaped cavities 146 in the support. If the pad 48 is heavily inflated, the tube 32 between it and the separating part 34 is squeezed out completely at the location of a roller 32. If, however, the pad 48 is only slightly or not at all inflated, the hose is no longer squeezed sufficiently, as a result of which liquid can flow back from the pressure side to the suction side and thus the pump no longer delivers. In the embodiment shown, the cavities 146 are closed on one side by a sealing plug 147, while on the other side compressed air is supplied from a pressure accumulator 157 to each conduit-shaped cavity 146 via a collecting tube 152 and individual tubes 151. This receives compressed air via a pressure reducing valve 155 and a shut-off valve 156.

Die zum Aufpumpen der Auflage 48 gemäß der Ausführungsform der Fig. 17-20 erforderliche Druckluft kann mit einer gemäß den Fig. 21-23 ausgeführten Schlauchpumpe 30 selbst gewonnen werden. Diese Schlauchpumpe verfügt über eine sekundäre Schlauchpumpe 177 mit einem sekundären Förderschlauch 178, der entlang der Innenseite des Trennteites 34 von einem sekundären Saugstutzen 181 zu einem sekundären Druckstutzen 182 verlegt ist. In den Laufrollen 52 ist jeweils eine Umfangsnut 179 ausgespart, durch die der sekundäre Förderschlauch 178 geführt ist. Die Nut ist jedoch nur so tief, daß der zusammengequetschte sekundäre Förderschlauch 178 in ihr Platz hat. Luft strömt vom sekundären Druckstutzen 182 durch eine Verbindungsleitung 176 in ein Wandteil 175, in dem durch Durchgangsöffnungen 174 ein Einführen der Luft in einzelne leitungsförmige Hohlräume 146 der Auflage 48 erfolgt. Der Druck der Luft ist durch ein Ventil 189 mit Einstellschraube 196 einstellbar. Das auf der Druckseite befindliche Ende der Auflage 48 ist bei der Ausführungsform gemäß Fig. 21 als Pulsationsdämpfer 137 ausgebildet.The compressed air required to inflate the support 48 according to the embodiment of FIGS. 17-20 can itself be obtained with a hose pump 30 designed according to FIGS. 21-23. This hose pump has a secondary hose pump 177 with a secondary delivery hose 178, which runs along the inside of the separating part 34 from a secondary suction nozzle 181 to a secondary one ren pressure port 182 is installed. In the rollers 52, a circumferential groove 179 is cut out, through which the secondary delivery hose 178 is guided. However, the groove is only so deep that the squeezed secondary delivery hose 178 has its place. Air flows from the secondary pressure port 182 through a connecting line 176 into a wall part 175, in which the air is introduced through through openings 174 into individual line-shaped cavities 146 of the support 48. The pressure of the air can be adjusted by a valve 189 with adjusting screw 196. The end of the support 48 located on the pressure side is designed as a pulsation damper 137 in the embodiment according to FIG. 21.

Bei allen Pumpen kann statt eines geschlossenen Bandes als Trennteil 34 auch ein offenes Band verwendet werden, das an seinen beiden Enden fest am Gehäuse 31 angebracht ist. Statt Laufrollen können beliebige Quetschkörper, auch solche, die nur gleiten, also nicht rollen, verwendet werden, deren Achsen parallel und konzentrisch zur Läuferachse stehen.In all pumps, instead of a closed band, an open band can also be used as the separating part 34, which is firmly attached to the housing 31 at both ends. Instead of rollers, any squeeze body can be used, even those that only slide, i.e. do not roll, whose axes are parallel and concentric to the rotor axis.

Bei erfindungsgemäßen Pumpen läßt sich die förderbare Menge auch leicht durch Auswechseln von Schläuchen, die jeweils unterschiedliche Querschnitte aufweisen, ändern. Es muß nur darauf geachtet werden, daß der äußere Schlauchumfang höchstens dem doppelten des Abstandes der beiden ebenen Begrenzungswände voneinander entspricht. Ein solches Einstellen der Fördermenge durch den Einsatz von Schläuchen mit unterschiedlichem Querschnitt ist bei herkömmlichen Schlauchpumpen nicht möglich, da die gesamte Pumpenkonstruktion nach Tiefe und Durchmesser auf den Durchmesser eines ganz bestimmten Schlauches angepaßt ist.In the case of pumps according to the invention, the quantity which can be conveyed can also easily be changed by replacing hoses which each have different cross sections. It is only necessary to ensure that the outer circumference of the tube corresponds at most to twice the distance between the two planar boundary walls. Such adjustment of the delivery rate through the use of hoses with different cross-sections is not possible with conventional peristaltic pumps, since the entire pump construction is adapted in terms of depth and diameter to the diameter of a specific hose.

Prinzipiell funktioniert die Pumpe bereits mit einem einzigen im Inneren des Trennteiles umlaufenden Quetschkörper. Für praktische Zwecke sind jedoch mindestens zwei Körper vorhanden. Vorteilhafterweise werden drei oder vier Quetschkörper verwendet.In principle, the pump already works with a single squeeze body rotating inside the separating part. However, at least two bodies are present for practical purposes. Three or four squeeze bodies are advantageously used.

Claims (12)

1. Stricture pump comprising :
a casing (31) having
a peripheral wall (37) which, at least in a pump portion connecting a suction chamber (38.1) to a delivery chamber (38.2) in the casing, is of circular cylindrical shape,
a flat rear end wall (35) which closes the casing at the front,
a flat front wall (36, 43) which closes the casing at the front,
a suction branch (45) through which the fluid to be pumped is drawn by suction into the suction chamber, and
a delivery branch (46) through which the fluid is forced out of the delivery chamber,
a rotor (33)
which rotates, in the interior space (38) of the casing, in the direction from the suction chamber to the delivery chamber,
whose rotor axis coincides with the cylinder axis of the pump portion, and
said rotor (33) having at least one constricting member (52) whose axes is disposed parallel to the axis of the rotor,
a dividing member (34) in the form of a band, being substantially stable in respect of length, being disposed arround the rotor, and lying adjacent to the front wall and the rear end wall,
a hose (32)
which is disposed, between the suction branch (45) and the delivery branch (46), along the peripheral wall (37),
whose periphery corresponds at most to twice the distance between the rear end wall (35) and the front wall (43), and
a liquid within the interior space of the casing, characterised in that
the dividing member
at least in its suction chamber portion, has a width such that on the rotation of the rotor at least the suction chamber portion is pushed to an fro sealingly in relation to the rear end wall (35) and the front wall (36, 43), and
is fastened in the interior space (38) between the delivery chamber (38.2) and the suction chamber (38.1) to a fastening part (53, 55, 57) outside the outermost periphery of the rotor and dividing the suction chamber from the delivery chamber, and
the hose (32) has substantially no restoring power of its own.
2. Pump according to claim 1, characterised in that the hose (32) has an elongate cross-sectional shape and is so disposed that the long axis of the cross-section lies parallel to the peripheral wall (37).
3. Pump according to claim 1 or 2, characterised by a secondary stricture pump (177) having at least one delivery hose (178) which is disposed on the inner side of the dividing member (34).
4. Pump according to one of the claims 1 to 3, characterised in that the suction chamber is in communication with an adjustable air inlet valve (123).
5. Pump according to one of the claims 1 to 4, characterised in that a connection (81, 82, 85, 86) is provided between the interior space surrounded by the dividing member (34) and the space between the dividing member and the peripheral wall, which connection permits the passage of the sealing liquid from the space between the dividing member and the peripheral wall into the interior space.
6. Pump according to one of the claims 1 to 5, characterised in that the front wall is formed by an annular front end wall (36) joined to the peripheral wall (37) and by a cover (43) which closes the opening left free by the annular end wall.
7. Pump according to one of the claims 1 to 6, characterised in that the dividing member (34) is provided with a sealing lip (101, 102) at each of its two longitudinal edges (99, 100).
8. Pump according to one of the claims 1 to 7, characterised in that the dividing member (34) is provided with transverse corrugation (97) on its outer side facing the peripheral wall (37).
9. Pump according to one of the claims 1 to 8; characterised in that the dividing member (34) is provided with transverse corrugation on its inner side.
10. Pump according to one of the claims 1 to 9, characterised in that a resilient layer (109) is provided externally on the dividing member (34).
11. Pump according to one of the claims 1 to 10, characterised in that a resilient layer (48) is provided on the pump portion of the peripheral wall (37).
12. Pump according to claim 11, characterised in that the resilient layer (48) has inflatable cavities (146) through the inflation of which the pressing power of the hose (32) between the dividing member (34) and the layer is adjustable.
EP84106168A 1983-06-03 1984-05-30 Flexible tube pump Expired EP0130374B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84106168T ATE22159T1 (en) 1983-06-03 1984-05-30 HOSE PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3320091A DE3320091A1 (en) 1983-06-03 1983-06-03 HOSE PUMP
DE3320091 1983-06-03

Publications (3)

Publication Number Publication Date
EP0130374A2 EP0130374A2 (en) 1985-01-09
EP0130374A3 EP0130374A3 (en) 1985-04-17
EP0130374B1 true EP0130374B1 (en) 1986-09-10

Family

ID=6200564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106168A Expired EP0130374B1 (en) 1983-06-03 1984-05-30 Flexible tube pump

Country Status (5)

Country Link
US (1) US4540350A (en)
EP (1) EP0130374B1 (en)
JP (1) JPH0694873B2 (en)
AT (1) ATE22159T1 (en)
DE (2) DE3320091A1 (en)

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Also Published As

Publication number Publication date
ATE22159T1 (en) 1986-09-15
EP0130374A3 (en) 1985-04-17
JPS6079188A (en) 1985-05-04
EP0130374A2 (en) 1985-01-09
JPH0694873B2 (en) 1994-11-24
DE3460686D1 (en) 1986-10-16
US4540350A (en) 1985-09-10
DE3320091A1 (en) 1984-12-06

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