EP4224017A1 - Pinch pump - Google Patents

Abstract

Hose squeeze pump (1) with a housing (5), at least three pressure rollers (7) and at least one counter bearing (3), with at least one hose (4) between at least one of the at least three pressure rollers (7) and the at least one counter bearing (3) can be arranged and wherein the at least one hose (4) can be squeezed by pressing the at least one hose (4) against the at least one counter bearing (3) by means of at least one of the at least three pressure rollers (7), the at least three pressure rollers (7) of at least one drive shaft (10) can be rotated by friction, the at least one counter-bearing (3) of the peristaltic pump (1) being movable at least in regions relative to the housing (5), preferably when the peristaltic pump (1) is in operation.

Description

The invention relates to a hose squeeze pump with a housing, at least three pressure rollers and at least one counter bearing, wherein at least one hose can be arranged between at least one of the at least three pressure rollers and the at least one counter bearing, and wherein the at least one hose can be opened by pressing the at least one hose against the at least a counter bearing can be squeezed by means of at least one of the at least three pressure rollers, the at least three pressure rollers being rotatable by at least one drive shaft by friction. In addition, the invention relates to a dosing system for dosing liquids with a peristaltic pump, a method for operating a peristaltic pump and a method for adjusting a peristaltic pump.

Hose squeeze pumps are already known from the prior art. They are used, among other things, in dosing systems for dosing liquids.

The basic functional principle is that at least one local pinch of the at least one hose is moved along the at least one hose. A pressure or a negative pressure can be generated and liquids can be conveyed in the hose. The at least one local pinch is realized by pressing the at least one tube against the at least one counter-mold by means of the at least one pressing device. The pressing device is moved in such a way that the at least one local pinch moves along the tube. In particular, radial peristaltic pumps are known which the hose lies in a curved counter-shape, in particular in the shape of a segment of a circle, and the pressing elements of the pressing device describe a curved path, in particular a circular path. Also known are linear peristaltic pumps, in which the hose is arranged along a straight line.

Also known are peristaltic pumps of the type mentioned at the outset, in which the drive device is designed as a friction drive with at least three drive rollers. The drive rollers are turned by friction by a drive shaft. Such peristaltic pumps can be particularly compact. In addition, no gearbox is necessary for the drive, since the drive rollers can be driven directly by a drive shaft on friction.

The pamphlet WO 2004/044425 A1 shows a radial peristaltic pump, in which the pressing device comprises a rotor with three pressure rollers, the pressure rollers being rotatably mounted on the rotor. The counter mold in the form of a segment of a circle is designed as part of a housing cover. The counter mold can be slid together with the housing cover so that when the housing cover is opened the counter mold is removed from the clamping device and the hose can be replaced.

A disadvantage of this prior art is that the distance between the pressing device and the counter mold is fixed in the operating state. The only resilient element is the hose itself. This means that all tolerances and changes in wall thickness of the hose, for example Aging and wear, are absorbed by the hose itself.

In the prior art, radial peristaltic pumps are also known, in which the pressure rollers are spring-mounted on the rotor in the radial direction. The pressure rollers can thus be moved in the radial direction and can compensate for tolerances and changes in the wall thickness of the hose using the springs of the pressure rollers.

The disadvantage of this prior art is that a larger installation space is required and the construction becomes more complex, since in particular each pressure roller requires its own spring. Due to the greater radial extent, a greater torque is required for the drive in such a design.

The object of the present invention is to provide a peristaltic pump which avoids the stated disadvantages of the prior art. In particular, a peristaltic pump is to be created in which variable properties, in particular tolerances and changes in wall thickness, of the hose can be compensated for, while the peristaltic pump has a compact and simple design.

It is provided according to the invention that the at least one counter bearing of the peristaltic pump, preferably in the operating state of the at least one peristaltic pump, can be moved at least in regions relative to the housing.

The counter bearing can thus be adapted to properties of the at least one tube. In particular, tolerances and changes in the wall thickness of the hose, which can arise as a result of wear or aging of the hose, can thus be compensated for by an adapting movement of the counter bearing, even during operation. For example, the at least one counter bearing can be moved closer in the direction of the pressure rollers if the wall thickness decreases as the hose ages. In addition, the position of the counter bearing can also be adapted to a changing elasticity of the at least one tube. The at least one counter bearing can also be adapted to different hose types with different dimensions or materials or can adapt itself.

Meanwhile, no requirements are placed on the pressing device, the pressing device in particular does not have to be designed to be movable and/or spring-loaded in a direction transverse to the hose, which means that the pressing device can be designed with a particularly compact and simple friction drive with at least three pressure rollers.

In a preferred exemplary embodiment, it is provided that the at least one counter bearing of the peristaltic pump can be moved at least in regions relative to the housing in at least two spatial directions of at least one plane, preferably being displaceable and/or tiltable within the at least one plane.

In this application, the term spatial directions is understood in the sense of orientation in space. A movement or force that occurs or acts in one spatial direction can still occur or act in two opposite directions. In other words: A movement or a force that takes place or acts in a spatial direction can have a sign.

To compensate for irregularities and tolerances, more complicated mobility of the at least one counter bearing than linear displacement can be advantageous. Irregularities, for example a varying hose diameter, in the hose can be better compensated for in this way, adapted to the hose shape and hose layout.

This is particularly advantageous with curved counter bearings, such as those used in radial peristaltic pumps. Depending on the position of the pinch in the hose, which is also curved, or the pressure roller causing the pinch, variable properties, in particular tolerances or changes in wall thickness, of the hose must be caused by the movement of the at least one counter bearing in several different directions in space, which in particular is in a plane perpendicular to the axis of rotation of the pressure rollers are aligned.

Due to the fact that the at least one counter-bearing can be moved at least in regions relative to the housing in at least two spatial directions within at least one plane when the peristaltic pump is in operation is, tolerances and wall thickness changes of at least one tube can be better compensated.

Provision can be made for at least one bearing projection to be arranged on the housing and/or on the at least one abutment, with the at least one abutment being mounted on the bearing projection, preferably in a tiltable manner, particularly preferably with the at least one abutment being supported in a central region on the at least one bearing projection . In addition or as an alternative, it can be provided that the at least one counter bearing is mounted such that it can tilt relative to the housing, preferably about a central region of the at least one counter bearing. In this way, tolerances or changes in wall thickness of the at least one tube can be compensated for at the edge areas of the at least one counter bearing. It is preferably provided that the tilting movement is acted upon by a spring with a restoring spring force.

Provision can be made for at least one support projection to be arranged on the housing and/or on the at least one counter bearing, with the at least one support projection allowing the at least one counter-shape to be displaced away from the at least one hose and towards the at least one hose. Provision is preferably made for the displacement movement to be acted upon by a spring with a restoring spring force.

In one embodiment, the at least one, preferably rigid, counter bearing is acted upon by a spring with a spring force in the direction of the at least one hose, preferably with the spring force acting in at least two spatial directions within the at least one plane. The at least one counter bearing is thus pressed and/or pulled against the at least one hose by the at least one spring. In this way, the position of the at least one counter bearing can always be optimally adapted to the at least one hose.

In addition or as an alternative, it can be provided that the at least one counter bearing itself is designed as a spring and is pretensioned in the direction of the at least one hose, so that a spring force acts in the direction of the at least one hose. In this way, the at least one counter bearing can always be optimally adapted to the at least one hose.

The at least one spring can act as a tension spring and/or as a compression spring. It can be formed as a coil spring, leaf spring, plastic body spring, rubber band and/or part of the housing. This also applies to a counter bearing designed as a spring.

In a preferred embodiment, the at least one spring engages in at least one engagement area on the at least one counter bearing, wherein the at least one engagement area extends over at least one third, preferably at least half, or particularly preferably the entire length of the at least one counter bearing. It can be caused that the spring force acts in at least two spatial directions of at least one plane. The spring force can act uniformly on a large part of the at least one counter bearing. The counter bearing can in turn transmit this force evenly to the at least one hose.

Provision can be made for the at least one spring to act in at least two areas of action on the at least one counter bearing, with the at least two areas of action being arranged at a distance from one another, the distance being at least a third, preferably at least half or particularly preferably almost the entire Corresponds to length of at least one counter bearing. It can be brought about that the spring force acts in at least two spatial directions of at least one plane. With sufficiently rigid counter-bearings, the spring force can thus act uniformly on the at least one counter-bearing. The counter bearing can in turn transmit this force evenly to the at least one hose.

In one embodiment, the at least one spring is in contact with the side of the at least one counter bearing facing away from the at least one hose. It is preferably provided that the at least one spring rests along the entire length of the at least one counter bearing. In particular, the spring can partially wrap around a curved counter bearing.

It can be provided that the at least one counter bearing has a groove on the side of the at least one counter bearing facing away from the at least one hose, wherein the at least one spring can be inserted into the at least one groove. The groove preferably runs along the longitudinal direction of the at least one counter-mold. The at least one tongue can thus rest in the longitudinal direction of the at least one counter bearing, preferably along the entire length of the at least one counter bearing, and is held in the groove.

In one exemplary embodiment it is provided that the at least one spring is mounted on at least one bearing unit, the bearing unit being arranged on the housing and/or being designed as part of the housing. This achieves a compact and simple construction of the peristaltic pump.

It is preferably provided that the at least one bearing unit is designed as at least two bearing projections, particularly preferably with at least one bearing projection being arranged in the region of two opposite sides of the at least one counter bearing, particularly preferably with the at least one spring being designed as a tension spring. The spring can thus be fastened in the area of two opposite sides of the counter bearing and wrap around the at least one counter bearing.

The shape of the at least one bearing unit can essentially be adapted to the shape of the at least one counter bearing and/or the at least one bearing unit is arranged at a substantially constant distance from the at least one counter bearing, particularly preferably wherein the at least one spring is designed as a compression spring. The at least one counter-shape can be held on the at least one bearing unit via the compression spring. The peristaltic pump can thus be made compact. This makes it possible for several springs to attack along the counter bearing.

It can be provided that the at least one hose can be placed on at least one guide part that cannot be moved relative to the housing. This allows the hose to be guided. In particular, it is provided that the hose bears against at least one guide part in a section before and/or after the pinching section, in which the hose bears against the counter bearing.

Provision can preferably be made for the at least one guide part to be designed as a part, particularly preferably a side part, of the housing and for the at least one hose to be able to be placed against an inner wall of the housing. Additionally or alternatively, it can be provided that the at least one tube can be squeezed by pressing the at least one tube against the at least one guide part by means of at least one pressure roller. The hose can therefore be pressed against the at least one guide part and against the at least one counter bearing. The at least one guide part is located in the direction of the hose, in particular before and/or after the section of the hose in which the at least one hose is applied to at least one counter bearing.

Provision is particularly preferably made for the at least one bearing unit to be arranged on the at least one guide part. A particularly compact design of the peristaltic pump can thus be implemented.

In a preferred exemplary embodiment, the at least one counter bearing has a curved shape, preferably in the form of a segment of a circle. The counter bearing is preferably designed concentrically in relation to the imaginary outer circle described by the lateral surfaces of the pressure rollers.

A radius of curvature of the at least one counter bearing is preferably smaller than three times, preferably twice, the diameter of the at least one hose. A curve radius is preferably less than 2 centimeters, preferably less than 1 centimeter. The peristaltic pump is preferably designed as a compact pump. This is possible in particular because the drive is designed as a friction drive with pressure rollers.

A curve angle is preferably between 160° and 200°. This ensures that at least one pressure roller is always in squeezing contact with the hose.

Provision can be made for the at least one counter-bearing to be formed as a separate component, preferably with different versions of the at least one counter-bearing being usable for different hose dimensions, in particular hose wall thicknesses, of the at least one hose. The peristaltic pump can thus be easily adapted to different hose types.

In a preferred exemplary embodiment, the housing has a recess, in which case the at least one counter bearing can be arranged in the region of the recess, preferably in such a way that the recess is essentially covered by the at least one counter bearing.

In this way, the at least one counter-mold can be movably mounted relative to the housing. Due to the fact that the recess is essentially covered by the at least one counter bearing, the housing can nevertheless be designed to be essentially closed.

The at least three pressure rollers can be axleless and/or freely mounted without an axle pin. The hose can press the at least three pressure rollers against the at least one drive shaft. This fixes the position of the pressure rollers. In addition, the pressure rollers can be turned on for friction by rotating the drive shaft.

The at least three pressure rollers can be held and/or guided by a pressure roller guide and by at least one hose in the housing. Provision can be made for the at least three pressure rollers to be held by at least one hose in a range from 180° to less than 360° and by a pressure roller guide in the remaining, preferably lower, area.

Provision is preferably made for at least one pressure roller to be in squeezing contact with at least one hose in the operating state. The flow is thus at least partially interrupted in every position of the at least three pressure rollers. With this, a negative pressure or pressure can be generated in the hose, also statically.

The at least one drive shaft can be connected directly to a motor, preferably an electric motor. It is therefore sufficient to insert a motor with a drive shaft between the pressure rollers in order to make the peristaltic pump ready for operation. A gearbox is not necessary.

The at least one drive shaft can be placed against the lateral surfaces of the at least three pressure rollers. A rotation of the at least one drive shaft also rotates the rollers that roll on the at least one hose.

A dosing system according to the invention for dosing liquids has a peristaltic pump as described above. It is preferably provided that liquids can be conveyed by means of the peristaltic pump from at least one container to at least one target device, in particular to at least one dosing device.

• Andrehen der mindestens drei Anpresswalzen über mindestens eine auf Reibung angelegte Antriebswelle, sodass mindestens eine durch mindestens eine Anpresswalze erzeugte Quetschung des mindestens einen Schlauchs entlang des mindestens einen Schlauchs bewegt wird,
• Anpassen des mindestens einen Gegenlagers und/oder der Position des mindestens einen Gegenlagers an, vorzugsweise veränderliche, Eigenschaften, insbesondere der Schlauchwanddicke und/oder der Elastizität, des mindestens einen Schlauchs im Betriebszustand der Schlauchquetschpumpe durch eine zumindest abschnittsweise Bewegung des mindestens einen Gegenlagers relativ zum Gehäuse, vorzugsweise durch Dehnung und/oder Entspannung der mindestens einen Feder und/oder des mindestens einen als Feder ausgebildeten Gegenlagers.

A method according to the invention for operating a peristaltic pump has the following method steps:

• Turning on the at least three pressure rollers via at least one drive shaft applied to friction, so that at least one pinch of the at least one tube produced by at least one pressure roller is moved along the at least one tube,
• Adjusting the at least one abutment and/or the position of the at least one abutment to preferably variable properties, in particular the hose wall thickness and/or the elasticity, of the at least one hose in the operating state of the peristaltic pump by moving the at least one abutment at least in sections relative to the housing , preferably by stretching and/or relaxing the at least one spring and/or the at least one abutment designed as a spring.

The at least one abutment and/or the position of the at least one abutment can be adjusted by the restoring spring force without the intervention of an operator, in particular during the operating state.

• Auswahl mindestens eines ersten Gegenlagers oder mindestens eines zweiten Gegenlagers in Abhängigkeit von einer Schlauchdimension, insbesondere Schlauchwanddicke, des mindestens einen Schlauchs,
• Einbau des ausgewählten mindestens einen im vorigen Schritt ausgewählten Gegenlagers und des mindestens einen Schlauchs in das mindestens eine Gehäuse.

A method according to the invention for adapting a peristaltic pump, wherein at least two counter bearings are provided, wherein the at least two counter bearings are formed as separate components and have different properties, in particular dimension and/or material and/or elasticity, has the following method steps:

• Selection of at least one first abutment or at least one second abutment depending on a hose dimension, in particular hose wall thickness, of the at least one hose,
• Installing the at least one counter bearing selected in the previous step and the at least one hose in the at least one housing.

The peristaltic pump can thus be adapted to a large number of different types of hoses, in particular when the peristaltic pump is initially equipped with at least one hose. Despite the different designs of the hose, an optimal contact pressure can be guaranteed.

• Ausbau des mindestens einen ersten Gegenlagers,
• Auswahl mindestens eines zweiten Gegenlagers oder mindestens eines dritten Gegenlagers in Abhängigkeit von einer Schlauchdimension, insbesondere Schlauchwanddicke, mindestens eines weiteren Schlauchs,
• Einbau des ausgewählten mindestens einen im vorigen Schritt ausgewählten Gegenlagers und des mindestens einen weiteren Schlauchs in das mindestens eine Gehäuse.

In an exemplary embodiment of the method for adapting a peristaltic pump, in which at least one first counter bearing has been selected, the following additional method steps are provided:

• Expansion of the at least one first counter bearing,
• Selection of at least one second abutment or at least one third abutment depending on a hose dimension, in particular hose wall thickness, at least one additional hose,
• Installing the at least one counter bearing selected in the previous step and the at least one additional hose in the at least one housing.

In particular, in addition to the initial equipment of the hose squeeze pump with at least one hose, the counter bearing can be exchanged when the hose is exchanged. In particular, the additional hose has different properties than the previous hose.

Fig. 1

eine Schlauchquetschpumpe nach dem Stand der Technik in einer perspektivischen Darstellung,

Fig. 2

die Schlauchquetschpumpe aus Fig. 1 in einer Schnittdarstellung,

Fig. 3

ein Ausführungsbeispiel einer Schlauchquetschpumpe gemäß der Erfindung in Schnittdarstellung,

Fig. 4

die Schlauchquetschpumpe aus Fig. 3 in einer perspektivischen Darstellung,

Fig. 5

die Schlauchquetschpumpe aus Fig. 3 in einer alternativen perspektivischen Darstellung,

Fig. 6

die Schlauchquetschpumpe aus Fig. 3 in einer Vorderansicht,

Fig. 7a-c

die Schlauchquetschpumpe aus Fig. 3 in drei Seitenansichten,

Fig. 8

ein weiteres Ausführungsbeispiel einer Schlauchquetschpumpe mit Druckfedern in Schnittdarstellung, und

Fig. 9

ein weiteres Ausführungsbeispiel einer Schlauchquetschpumpe mit elastischer Gegenform in Schnittdarstellung.

Further details and preferred exemplary embodiments emerge from the figures. show:

1

a peristaltic pump according to the prior art in a perspective view,

2

the peristaltic pump off 1 in a sectional view,

3

an embodiment of a peristaltic pump according to the invention in a sectional view,

4

the peristaltic pump off 3 in a perspective view,

figure 5

the peristaltic pump off 3 in an alternative perspective view,

6

the peristaltic pump off 3 in a front view,

Fig. 7a-c

the peristaltic pump off 3 in three side views,

8

another embodiment of a peristaltic pump with compression springs in a sectional view, and

9

another embodiment of a peristaltic pump with an elastic counter-shape in a sectional view.

The 1 shows a peristaltic pump according to the prior art. The peristaltic pump has a housing 5 , the housing having a front part 51 and a rear part 52 . The front part 51 and the rear part 52 of the housing 5 are connected via a connecting device 13, which is preferably designed as a latching device.

Two openings are provided on the underside of the housing 5, through which the hose 4 reaches the outside. In particular, a first outer hose section 41 and a second outer hose section 42 are provided, with the first outer hose section 41 forming the inlet part of the hose 4 and the second outer hose section 42 forming the outlet part of the hose 4, depending on the direction of rotation of the pump, or vice versa.

A drive shaft 10 of an electric motor 14 leads through a further opening in the housing 5 at the rear into the interior of the housing. Inside the housing 5 there is a pressing device for pressing the hose 4, which is based on 2 is described.

The 2 shows the peristaltic pump 1 in a sectional view. The course of the hose 4 through the pump can be seen in full here. Accordingly, the hose 4 has a pinch section between the first outer hose section 41 and the second outer hose section 42 43, in which the pressing device 2 can pinch the hose locally and the pinching of the hose 4 can advance. In the 2 two pinches 15 of the hose 4 can be seen in particular. The pinch section 43 is therefore that area of the hose 4 on which the pressing device acts on the hose 4 in the course of a cycle.

The pressing device comprises three pressure rollers 7 which pinch the hose 4 locally. The pressure rollers 7 are driven directly by means of the drive shaft 10 , which protrudes from the electric motor 14 into the housing 5 . The drive rollers 7 are pressed against the drive shaft 10 by the hose 4 so that they can be driven by the drive shaft 10 by friction. The drive shaft 10 bears against the lateral surfaces of the pressure rollers 7 . In particular, the drive rollers 7 are evenly distributed azimuthally around the drive shaft 10 .

The hose 4 is squeezed by being pressed against an inner wall of the housing 5 by the pressure rollers 7 . The housing 5 thus acts as a counter bearing for the hose 4. The inner wall of the housing 5 has a curved shape, in particular a segment of a circle, in this area. The lateral surfaces of the pressure rollers 7 move along an imaginary line which is arranged in sections concentrically to this shape. The area in which the tube is pinched is referred to as pinch section 43 .

The 3 shows an embodiment of a peristaltic pump 1 according to the invention in FIG sectional view. In contrast to the prior art figures 1 and 2 is the counter bearing 3, preferably in the operating state of the peristaltic pump 1, at least partially movable relative to the housing 5. The position of the counter bearing 3 can thus be adapted to various properties of the hose 4 . Changing properties of the tube 4, such as tolerances and changes in wall thickness, of the tube 4 can also be compensated for during operation of the pump.

In particular, the counter bearing 3 can be moved at least in regions relative to the housing 5 in at least two spatial directions of a plane E. This can, for example, a movement of the anvil 3 in the sectional plane of 3 are equivalent to. The counter bearing 3 can be displaced and/or tilted in this plane E.

For example, the counter bearing 3 can move in several directions R1 to R5. The directions R1 to R5 are arranged transversely to the counter bearing 3. However, mobility is not limited to these directions.

The counter-bearing 3 can thus yield to a certain extent to the hose 4 pressed against the counter-bearing 3 by the pressing device 2 . Any variable properties, such as tolerances and/or changes in wall thickness, of the hose 4 can be compensated for in this way. In particular, irregularities along the entire curved hose 4 can be leveled out.

The preferably rigid counter bearing 3 is pushed by means of a spring 8 with a spring force in the direction of the hose 4 applied. The spring force preferably acts in at least two spatial directions R1, R2, R3, R4, R5 within the at least one plane E. The retroactive spring force acts in one of the arrows in FIG 3 opposite direction towards the hose 4.

In this exemplary embodiment, the spring 8 is designed as a tension spring and pulls the counter bearing 3 against the hose 4. In particular, the spring 8 is designed as a spiral spring.

The spring 8 acts on the counter bearing 3 in a working area 17 . The attack area 17 extends over the entire length of the counter bearing 3 .

The spring 8 rests on the side of the counter bearing 3 facing away from the hose 4 . In particular, the spring 8 rests on the counter-bearing 3 along the entire length of the counter-bearing. The counter bearing 3 has a groove 11 on the side facing away from the hose 4 , the spring 8 being able to be inserted into the groove 11 . The groove 11 is in the sectional view of 3 not recognizable, it will be related to this 4 referred.

Provision is also made for the spring 8 to be mounted on at least one bearing unit 9 , with the bearing unit 9 being designed as part of the housing 5 . The bearing unit 9 is designed in particular as two bearing projections 91 .

In each case, a bearing projection 91 is arranged in the area of two opposite sides of the counter bearing 3 . The spring 8, which is hooked into the two bearing projections 91, rests lengthwise on the counter bearing 3 in between.

The spring 8 can be hung on the bearing projections 91 by means of the fastening rings 16 . The fastening rings 16 are in particular in 4 recognizable.

The hose 4 can also be placed against at least one guide part 6 that cannot be moved relative to the housing 5 . The guide part 6 is designed as a side part 54 of the housing 5 and the hose 4 can be placed against an inner wall of the housing 5 .

In particular, the tube 4 can be squeezed by pressing it against the guide parts 6 by means of one of the pressure rollers 7 . How from the 3 As can be seen, the squeezing of the hose 4 is produced by a pressure roller 7 by squeezing a first guide part 6 . The hose 4 is released again in the area of a second guide part 6 .

The storage unit 9, in which 3 the two bearing projections 91 is on the guide part 6, in which 3 the side part 54 of the housing 5, arranged.

The counter bearing 3 has the shape of a segment of a circle. The curve angle is slightly less than 180°.

The curve radius of the counter bearing 3 is in the 3 less than three times the unpinched diameter of the tube 4. It is preferably provided that the radius of curvature is less than 2 centimeters, particularly preferably less than 1 centimeter.

The counter bearing 3 is formed as a separate component. The counter bearing 3 can thus be exchanged and individually adapted to hoses 4 with different properties, in particular hose dimensions.

The counter bearing 3 is arranged in a recess of the housing 5 . The recess is essentially covered by the counter bearing 3 . For example, this is in 4 evident.

The pressing device is essentially as in the 2 shaped.

The three pressure rollers 7 are mounted freely without an axle pin and can be pressed against the drive shaft 10 by the hose 4 .

By rotating the drive shaft 10 , the pressure rollers 7 are driven by friction and roll off the hose 4 . The drive shaft 10 can be placed against the lateral surfaces of the pressure rollers 7 .

The three pressure rollers 7 can be held and/or guided in the housing 5 by a pressure roller guide 2 and by the hose 4 . Despite the fact that the pressure rollers 7 are mounted freely, they are thus held in the housing 5 .

A very compact pressing device is thus realized.

The 4 shows a perspective view of the peristaltic pump 1 3 .

The housing 5 comprises a main part 53 and a side part 54. The main part 53 covers the front, rear and underside of the peristaltic pump 1 from. The side part 54 extends over the sides and the top of the peristaltic pump 1, the sides and the top describing a shape that is essentially in the form of a segment of a circle. The side part 54 and the main part 53 are connected via a connecting device 13 . In addition, the side part 54 is supported on the upper side of the peristaltic pump 1 on the main part 53 by means of two projections 55 .

A recess is formed in the side part 54, with the counter bearing 3 being arranged in the region of the recess. The recess is essentially covered by the counter bearing 3 so that the housing 5 is essentially closed despite the recess.

On the housing 5, in particular on the side part 54 of the housing 5, two support projections 12 are arranged. The support projections 12 are preferably arranged on two opposite longitudinal sides of the counter bearing 3 . In particular, the support projections 12 are arranged in a central area of the counter bearing 3 .

The support projections 12 allow the counter bearing 3 to be displaced away from the tube 4 and prevent it from being displaced towards the tube 4 . Since the counter bearing 3 is drawn towards the tube 4 by the spring 8 , the counter bearing 3 can rest on the support projection 12 .

The counter bearing 3 is away from the hose 4, in particular in a direction transverse to a central region of the counter bearing 3. movable. The counter bearing 3 can thus move outwards against the spring force and adapt to the hose 4 .

The counter bearing 3 can be mounted on the support projection 12, preferably in a tiltable manner. The counter bearing 3 is preferably mounted in a central area on at least one support projection 12.

It can also be provided that at least one support projection 12 is arranged on the counter bearing 3 and can be supported on the housing 5, this embodiment not being shown in the figures.

The figure 5 shows an alternative perspective view of the peristaltic pump 1 from FIG 3 . The electric motor 14 can be seen better here, the drive shaft 10 of which can be inserted into the housing in a particularly simple manner through an opening in the housing 5 in order to drive the pressure rollers 7 .

The 6 shows a front view of the peristaltic pump 1 from FIG 3 . This is the side facing away from the electric motor 14 . The drive shaft 10, which is inserted into the housing 5 from the other side, can be seen here in the projection.

Provision is made for an opening in the housing 5 for inserting the drive shaft 10 to be provided on both sides. The electric motor 14 can thus be attached to one of the two sides in the peristaltic pump 1 .

The Figures 7a to 7c show the peristaltic pump 1 in three side views, with the electric motor 14 also being visible in each case.

The electric motor 14 is arranged coaxially to an imaginary axis of rotation of the pressure rollers 7 .

Instead of the electric motor 14, another type of motor can also be used. It is only important that a drive shaft 10 driven in any way protrudes into the housing 5 in order to drive the pressure rollers 7 .

In an alternative exemplary embodiment, which is not shown, the spring 8 is not in the form of a spiral spring, but in the form of a rubber band. A rubber band can also run in the groove 11 along the counter bearing 3 .

It is also conceivable that the spring 8 is designed as a leaf spring or a plastic body spring.

The 8 shows an alternative embodiment of the peristaltic pump 1. The peristaltic pump 1 is designed essentially the same as in FIGS Figures 3 to 7 However, instead of acting as a tension spring, the at least one spring 8 acts as a compression spring.

The at least one spring 8 acts on the side of the counter bearing 3 facing away from the hose 4 . In particular, three springs 8 are provided here in the form of compression springs, which act on the counter bearing 3 in three different areas of action.

The engagement areas 17 are arranged at a distance from one another, the distance between two adjacent engagement areas 17 roughly corresponding to one third of the total length of the counter bearing 3 and the distance between the two non-adjacent engagement areas 17 roughly corresponding to the entire length of the counter bearing 3 .

Because several spatially spaced engagement areas 17 of the springs 8 are provided, a restoring spring force can be realized in at least two spatial directions R1, R2, R3 within the plane E on the counter bearing 3. The counter bearing 3 can move within the plane E and can compensate for variable properties of the tube 4, such as different dimensions and/or elasticity. The restoring spring force acts in the opposite direction to the arrows (spatial directions) R1, R2, R3.

The springs 8 are mounted on a bearing unit 9 , the bearing unit 9 being connected to the housing 5 or being formed as part of the housing 5 .

The shape of the bearing unit 9 is essentially adapted to the shape of the counter bearing 3 . The bearing unit 9 is arranged at a substantially constant distance from the counter bearing 3 . The peristaltic pump 1 can thus be designed to be particularly compact.

A spring 8 designed as a compression spring can also be designed as a leaf spring, the leaf spring being mountable on the housing 5 and pressing against the counter bearing 3 .

The 9 shows a further alternative embodiment of the peristaltic pump 1. Apart from the counter bearing 3 and the spring 8, the peristaltic pump 1 is designed essentially the same as in FIG Figures 3 to 7 .

In this exemplary embodiment, the counter bearing 3 itself is designed as a spring 8 and is pretensioned in the direction of the hose 4 so that a spring force acts in the direction of the at least one hose 4 .

In particular, the counter-bearing can be formed from an elastic material, for example as a preferably rigid rubber band.

The counter bearing 3 is attached to the housing 5 . By clamping the counter bearing 3 , the counter bearing 3 can move in relation to the housing 5 at least in certain areas.

In particular, the abutment 3 can move in at least two spatial directions within the plane E, in particular locally differently due to the elasticity, and thus compensate for variable properties of the tube 4, such as different dimensions and/or elasticity.

Reference List

1

peristaltic pump

2

pressure roller guide

3

counter bearing

4

Hose

41

first outer tube section

42

second outer tube section

43

pinch section

5

Housing

51

front part of the housing

52

rear part of the housing

53

main part of the case

54

side part of the housing

6

guide part

7

pressure roller

8th

Feather

9

storage unit

91

bearing projection

10

drive shaft

11

groove

12

support projection

13

connecting device

14

electric motor

15

bruise

16

Spring fixing ring

17

attack range

Claims (15)

Hose squeeze pump (1) with a housing (5), at least three pressure rollers (7) and at least one counter bearing (3), with at least one hose (4) between at least one of the at least three pressure rollers (7) and the at least one counter bearing (3) can be arranged and wherein the at least one hose (4) can be squeezed by pressing the at least one hose (4) against the at least one counter bearing (3) by means of at least one of the at least three pressure rollers (7), the at least three pressure rollers (7) of at least one drive shaft (10) can be rotated by friction, characterized in that the at least one counter-bearing (3) of the peristaltic pump (1) can be moved at least in regions relative to the housing (5), preferably when the peristaltic pump (1) is in operation. The peristaltic pump (1) according to the preceding claim, wherein the at least one abutment (3) of the peristaltic pump (1) in the operating state of the peristaltic pump (1) at least in regions relative to the housing (5) in at least two spatial directions (R1, R2, R3, R4, R5) is movable in at least one plane (E), preferably displaceable and/or tiltable within the at least one plane (E). Hose squeeze pump (1) according to one of the preceding claims, wherein - at least one bearing projection (12) is arranged on the housing (5) and/or on the at least one counter-bearing (3), the at least one counter-bearing (3) being mounted on the bearing projection (12), preferably tiltably, particularly preferably the at least a counter bearing (3) is mounted in a central area on at least one support projection (12), and/or - the at least one thrust bearing (3) is mounted such that it can tilt relative to the housing (5), preferably about a central region of the at least one thrust bearing (3), and/or - at least one bearing projection (12) is arranged on the housing (5) and/or on the at least one counter bearing (3), the at least one bearing projection (12) causing the at least one counter bearing (3) to be displaced away from the at least one hose (4). allowed and prevented towards at least one hose (4), and/or - The at least one counter-bearing (3) can be displaced away from the at least one hose (4), preferably in a direction transverse to a central region of the at least one counter-bearing (3). Hose squeeze pump (1) according to one of the preceding claims, wherein - the at least one, preferably rigid, counter bearing (3) is acted upon by a spring (8) with a spring force in the direction of the at least one hose (4), preferably with the spring force acting in at least two spatial directions (R1, R2, R3, R4, R5) acts within the at least one plane (E), and/or - the at least one counter bearing (3) itself is designed as a spring (8) and is prestressed in the direction of the at least one hose (4), so that a spring force acts in the direction of the at least one hose (4), particularly preferably the at least one spring (8) - Acts as a tension spring, and/or - Acts as a compression spring, and/or - Is formed as a spiral spring, leaf spring, plastic body spring, rubber band and/or part of the housing (5). Hose squeeze pump (1) according to the preceding claim, wherein the at least one spring (8) - engages in at least one engagement area (17) on at least one counter bearing (3), wherein the at least one engagement area (17) is extended over at least one third, preferably at least half or particularly preferably the entire length of the at least one counter bearing (3). , and or - engages at least one counter bearing (3) in at least two engagement areas (17), the at least two engagement areas (17) being arranged at a distance from one another, the distance being at least a quarter, preferably at least half or particularly preferably almost the entire Corresponds to the length of the at least one counter bearing (3). Tubular squeeze pump (1) according to claim 4 or 5, wherein the at least one spring (8) rests on the side of the at least one counter bearing (3) facing away from the at least one tube (4), preferably wherein - the at least one spring (8) rests along the entire length of the at least one counter bearing (3), and/or - the at least one counter bearing (3) has a groove (11) on the side of the at least one counter bearing (3) facing away from the at least one hose (4), the at least one spring (8) being insertable into the at least one groove (11). is. Tubular squeeze pump (1) according to one of Claims 4 to 6, the at least one spring (8) being mounted on at least one bearing unit (9), the at least one bearing unit (9) being arranged on the housing (5) and/or as one part of the housing (5) is formed, preferably wherein - the at least one bearing unit (9) is designed as at least two bearing projections (91), particularly preferably with at least one bearing projection (91) being arranged in the area of two opposite sides of the at least one counter bearing (3), particularly preferably with the at least one Spring (8) is designed as a tension spring, and / or - the shape of the at least one bearing unit (9) is essentially adapted to the shape of the at least one counter bearing (3) and/or the at least one bearing unit (9) is arranged at a substantially constant distance from the at least one counter bearing (3), particularly preferably, the at least one spring (8) being designed as a compression spring. Hose squeeze pump (1) according to one of the preceding claims, wherein the at least one hose (4) can be placed on at least one guide part (6) which cannot be moved relative to the housing (5), preferably wherein - the at least one guide part (6) is designed as a part, particularly preferably a side part (54), of the housing (5) and the at least one hose (4) can be placed against an inner wall of the housing (5), and/or - the at least one tube (4) can be squeezed by pressing the at least one tube (4) against the at least one guide part (6) by means of at least one pressure roller (7). Hose squeeze pump according to Claims 7 and 8, in which the at least one bearing unit (9) is arranged on the at least one guide part (6). Hose squeeze pump (1) according to one of the preceding claims, wherein the at least one counter bearing (3) has a curved shape, preferably in the form of a segment of a circle, preferably wherein - a curve radius of the at least one counter bearing (3) is smaller than three times, preferably twice, the diameter of the at least one hose (4), and/or - wherein a radius of curvature is less than 2 centimeters, preferably less than 1 centimeter, and/or - a curve angle is 160° to 200°. Hose squeeze pump (1) according to one of the preceding claims, wherein - the at least one counter-bearing (3) is formed as a separate component, preferably wherein different versions of the at least one counter-bearing (3) can be used for different hose dimensions, in particular hose wall thicknesses, of the at least one hose (4), and/or - The housing (5) has a recess, wherein the at least one counter bearing (3) can be arranged in the region of the recess, preferably in such a way that the recess is essentially covered by the at least one counter bearing (3). Hose squeeze pump (1) according to one of the preceding claims, wherein - the at least three pressure rollers (7) are axleless and/or freely mounted without an axle pin, preferably wherein the at least three pressure rollers (7) can be pressed against the at least one drive shaft (10) by the at least one hose (4), and/or - the at least three pressure rollers (7) can be held and/or guided in the housing (5) by a pressure roller guide (2) and by at least one hose (4), and/or - in the operating state, at least one pressure roller (7) is in squeezing contact with at least one hose (4), and/or wherein the at least one drive shaft (10) - is connected directly to a preferably electric motor (14), and/or - Can be placed against the lateral surfaces of the at least three pressure rollers (8). Metering system for metering liquids with a peristaltic pump (1) according to one of the preceding claims, preferably wherein liquids can be conveyed from at least one container to at least one target device, in particular to at least one metering device, by means of the peristaltic pump (1). Method for operating a peristaltic pump (1) according to one of Claims 1 to 12, the following method steps being provided: - Turning on the at least three pressure rollers (7) via at least one drive shaft (10) applied to friction, so that at least one pinch (15) of the at least one hose (4) produced by at least one pressure roller (7) along the at least one hose (4) is moved, - Adapting the at least one counter bearing (3) and/or the position of the at least one counter bearing to preferably variable properties, in particular the hose wall thickness and/or the elasticity, of the at least one hose (4) in the operating state of the peristaltic pump (1) by a at least partial movement of the at least one counter bearing (3) relative to the housing (5), preferably by stretching and/or relaxing the at least one spring (8) and/or the at least one counter bearing (3) designed as a spring (8). A method for adjusting a peristaltic pump (1) according to any one of claims 1 to 12, wherein at least two counter bearings (3) are provided, wherein the at least two counter bearings (3) are formed as separate components and have different properties, in particular dimension and/or material and/or elasticity, with the following process steps: - Selection of at least one first counter-bearing (3) or at least one second counter-bearing (3) depending on a hose dimension, in particular hose wall thickness, of the at least one hose (4), - Installation of the selected at least one counter bearing (3) selected in the previous step and the at least one hose (4) in the at least one housing (5), preferably wherein at least one first counter bearing (3) has been selected, with the following preferred method steps: - Removal of at least one first thrust bearing (3), - Selection of at least one second counter bearing (3) or at least one third counter bearing (3) depending on a hose dimension, in particular hose wall thickness, at least one further hose (4), - Installation of the selected at least one counter bearing (3) selected in the previous step and the at least one additional hose (4) in the at least one housing (5).

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