Pinch pump

Abstract

A peristaltic squeeze pump (1) comprising a housing (5), at least three pressure rollers (7) and at least one counter bearing (3), wherein at least one hose (4) can be arranged between at least one of the at least three pressure rollers (7) and the at least one counter bearing (3), 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), wherein the at least three pressure rollers (7) are rotatable by friction from at least one drive shaft (10), and wherein the at least one counter bearing (3) of the peristaltic squeeze pump (1) is movable at least partially relative to the housing (5), preferably in the operating state of the peristaltic squeeze pump (1).

Description

[0001] The invention relates to a peristaltic pump with a housing, at least three pressure rollers, and at least one counterbearing, wherein at least one hose can be arranged between at least one of the at least three pressure rollers and the at least one counterbearing, and wherein the at least one hose can be squeezed by pressing the at least one hose against the at least one counterbearing by means of at least one of the at least three pressure rollers, wherein the at least three pressure rollers are frictionally rotatable by at least one drive shaft. Furthermore, the invention relates to a metering system for metering liquids using a peristaltic pump, a method for operating a peristaltic pump, and a method for adapting a peristaltic pump.

[0002] Peristaltic pumps are already well-known in the art. They are used, among other things, in dosing systems for dispensing liquids.

[0003] 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. This can be used to generate pressure or negative pressure and to convey liquids in the hose. The at least one local pinch is achieved by pressing the at least one hose against the at least one counter-shape 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 hose. Radial peristaltic squeeze pumps are particularly known in which the hose lies in a curved, in particular circular segment-shaped, counter-shape and the pressing elements of the pressing device describe a curved path, in particular a circular path. Linear peristaltic squeeze pumps are also known in which the hose is arranged along a straight path.

[0004] Also known are peristaltic pumps of the type mentioned above, in which the drive mechanism is designed as a friction drive with at least three drive rollers. The drive rollers are rotated by a drive shaft using friction. Such peristaltic pumps can be designed particularly compactly. Furthermore, no gear is required for the drive, since the drive rollers can be driven directly by a drive shaft using friction.

[0005] WO 2004 / 044425 A1 discloses a radial peristaltic pump in which the pressure device comprises a rotor with three pressure rollers, the pressure rollers being rotatably mounted on the rotor. The circular-segment-shaped counter-mold is formed as part of a housing cover. The counter-mold can be moved together with the housing cover, so that the counter-mold is removed from the pressure device when the housing cover is opened, allowing the hose to be replaced.

[0006] A disadvantage of this state-of-the-art technology is that the distance between the clamping device and the counter-mold is fixed during operation. The only resilient element is the hose itself. As a result, all tolerances and changes in the hose's wall thickness, for example, due to aging and wear, must be absorbed by the hose itself.

[0007] Radial peristaltic pumps are also known in the prior art, in which the pressure rollers are spring-mounted on the rotor in the radial direction. This allows the pressure rollers to move radially and compensate for tolerances and changes in the hose's wall thickness using the pressure roller springs.

[0008] The disadvantage of this state-of-the-art technology is that it requires more space and the design becomes more complex, especially since each pressure roller requires its own spring. Due to the larger radial expansion, this type of design requires a greater drive torque.

[0009] The object of the present invention is to create a peristaltic pump that avoids the stated disadvantages of the prior art. In particular, a peristaltic pump is to be created in which variable properties of the hose, in particular tolerances and changes in wall thickness, can be compensated for, while the peristaltic pump is compact and simply constructed.

[0010] According to the invention, the at least one counter bearing of the peristaltic pump is movable at least in regions relative to the housing, preferably in the operating state of the at least one peristaltic pump.

[0011] The counter bearing can thus be adapted to the properties of the at least one hose. In particular, tolerances and changes in the wall thickness of the hose, which can arise due to wear or aging of the hose, can be compensated for by an adaptive movement of the counter bearing, even during operation. For example, the at least one counter bearing can be moved closer towards the pressure rollers if the wall thickness decreases with increasing age of the hose. Furthermore, the position of the counter bearing can also adapt to changing elasticity of the at least one hose. The at least one counter bearing can also be adapted to different hose types with different dimensions or materials, or can adapt itself.

[0012] Meanwhile, no requirements are placed on the pressing device; in particular, the pressing device does not have to be movable and / or spring-loaded in a transverse direction to the hose, whereby the pressing device can be designed with a particularly compact and simple friction drive with at least three pressing rollers.

[0013] In a preferred embodiment, it is provided that the at least one counter bearing of the peristaltic pump is movable at least in regions relative to the housing in at least two spatial directions of at least one plane, preferably displaceable and / or tiltable within the at least one plane.

[0014] In this application, the term "spatial directions" refers to 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 force that occurs or acts in one spatial direction can have a sign.

[0015] To compensate for irregularities and tolerances, a more complex mobility of at least one counterbearing than linear displacement can be advantageous. Irregularities in the hose, such as a varying hose diameter, can thus be better compensated for by adapting the hose shape and hose layout.

[0016] This is particularly advantageous for curved counterbearings, such as those used in radial peristaltic pumps. Depending on the position of the pinch in the equally curved hose or the pressure roller causing the pinch, varying properties of the hose, in particular tolerances or changes in wall thickness, must be compensated for by moving at least one counterbearing in several different spatial directions, which are aligned in particular in a plane perpendicular to the rotational axis of the pressure rollers.

[0017] Due to the fact that the at least one counter bearing is movable at least partially relative to the housing in at least two spatial directions within at least one plane during the operating state of the peristaltic pump, tolerances and changes in the wall thickness of the at least one hose can be better compensated.

[0018] It can be provided that at least one support projection is arranged on the housing and / or on the at least one counter-bearing, wherein the at least one counter-bearing is mounted on the support projection, preferably in a tiltable manner, particularly preferably wherein the at least one counter-bearing is mounted in a central region on the at least one support projection. Additionally or alternatively, it can be provided that the at least one counter-bearing is mounted in a tiltable manner 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 hose at the edge regions of the at least one counter-bearing can be compensated for. It is preferably provided that the tilting movement is acted upon by a spring with a restoring spring force.

[0019] It can be provided that at least one support projection is arranged on the housing and / or on the at least one counter-bearing, wherein the at least one support projection allows displacement of the at least one counter-mold away from the at least one hose and prevents it toward the at least one hose. Preferably, the displacement movement is acted upon by a spring with a restoring spring force.

[0020] In one embodiment, the at least one, preferably rigid, counterbearing is subjected to a spring force in the direction of the at least one hose by means of a spring, preferably with the spring force acting in at least two spatial directions within the at least one plane. Thus, the at least one counterbearing is pressed and / or pulled against the at least one hose by the at least one spring. This allows the position of the at least one counterbearing to always adapt optimally to the at least one hose.

[0021] Additionally or alternatively, the at least one counter bearing can be designed as a spring and preloaded toward the at least one hose, so that a spring force acts toward the at least one hose. This allows the at least one counter bearing to always optimally adapt to the at least one hose.

[0022] The at least one spring can act as a tension spring and / or a compression spring. It can be formed as a spiral spring, a leaf spring, a plastic body spring, a rubber band, and / or part of the housing. This also applies to a counter bearing designed as a spring.

[0023] In a preferred embodiment, the at least one spring engages the at least one counter-bearing in at least one engagement region, wherein the at least one engagement region extends over at least one-third, preferably at least half, or particularly preferably the entire length of the at least one counter-bearing. The spring force can be caused to act in at least two spatial directions of at least one plane. The spring force can act evenly over a large portion of the at least one counter-bearing. The counter-bearing can, in turn, transmit this force evenly to the at least one hose.

[0024] It can be provided that the at least one spring acts on the at least one counter-bearing in at least two action areas, wherein the at least two action areas are arranged at a distance from one another, wherein the distance corresponds to at least one third, preferably at least half or particularly preferably almost the entire length of the at least one counter-bearing. The spring force can be caused to act in at least two spatial directions in at least one plane. With sufficiently rigid counter-bearings, the spring force can thus act evenly on the at least one counter-bearing. The counter-bearing can in turn transmit this force evenly to the at least one hose.

[0025] In one embodiment, the at least one spring rests on the side of the at least one counter-bearing facing away from the at least one hose. Preferably, 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.

[0026] 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-form. Thus, the at least one spring can 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.

[0027] In one embodiment, the at least one spring is mounted on at least one bearing unit, wherein the bearing unit is arranged on the housing and / or formed as part of the housing. This achieves a compact and simple design of the peristaltic pump.

[0028] Preferably, 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 attached in the region of two opposite sides of the counter-bearing and wrap around the at least one counter-bearing.

[0029] The shape of the at least one bearing unit can be substantially adapted to the shape of the at least one counter-bearing and / or the at least one bearing unit can be 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 to the at least one bearing unit via the compression spring. This allows the peristaltic pump to be designed compactly. This allows multiple springs to act along the counter-bearing.

[0030] It can be provided that the at least one hose can be placed on at least one guide part that is immovable relative to the housing. This allows the hose to be guided. In particular, it is provided that the hose rests on at least one guide part in a section before and / or after the squeezing section, in which the hose rests on the counter bearing.

[0031] It can preferably be provided that the at least one guide part is designed as a part, particularly preferably a side part of the housing and the at least one hose can be placed against an inner wall of the housing. Additionally or alternatively, it can be provided that the at least one hose can be squeezed by pressing the at least one hose 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 hose direction in particular before and / or after the section of the hose in which the at least one hose is placed on the at least one counter-bearing.

[0032] It is particularly preferred that the at least one bearing unit be arranged on at least one guide part. This allows for a particularly compact design of the peristaltic pump.

[0033] In a preferred embodiment, the at least one counterbearing has a curved, preferably circular-segment-shaped shape. The counterbearing is preferably designed concentrically with respect to the imaginary outer circle described by the lateral surfaces of the pressure rollers.

[0034] Preferably, the curve radius of the at least one counter bearing is less than three times, preferably twice, the diameter of the at least one hose. Preferably, the curve radius is 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.

[0035] The preferred curve angle is between 160° and 200°. This ensures that at least one pressure roller is always in squeezing contact with the hose.

[0036] It can be provided that the at least one counterbearing is formed as a separate component, preferably with different designs of the at least one counterbearing being usable for different hose dimensions, in particular hose wall thicknesses, of the at least one hose. The peristaltic pump can thus be adapted particularly easily to different hose types.

[0037] In a preferred embodiment, the housing has a recess, wherein the at least one counter bearing can be arranged in the region of the recess, preferably in such a way that the recess is substantially covered by the at least one counter bearing.

[0038] This allows the at least one counter-mold to be mounted movably relative to the housing. Because the recess is essentially covered by the at least one counter-bearing, the housing can still be designed to be essentially closed.

[0039] 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. Furthermore, the pressure rollers can be friction-driven by rotating the drive shaft.

[0040] The at least three pressure rollers can be held and / or guided by a pressure roller guide and by the at least one hose in the housing. It can be provided that the at least three pressure rollers are held by the at least one hose in a range from 180° to less than 360°, and in the remaining, preferably lower, area by a pressure roller guide.

[0041] It is preferably provided that, in the operating state, at least one pressure roller rests against at least one hose in a squeezing manner. Thus, the flow is at least partially interrupted in any position of the at least three pressure rollers. This allows a negative pressure or pressure to be generated in the hose, even statically.

[0042] At least one drive shaft can be directly connected to a motor, preferably an electric one. This means that simply inserting a motor with a drive shaft between the pressure rollers is sufficient to make the peristaltic pump ready for operation. A gearbox is not necessary.

[0043] The at least one drive shaft can be applied to the outer surfaces of the at least three pressure rollers. Rotation of the at least one drive shaft also rotates the rollers that roll on the at least one hose.

[0044] A dosing system according to the invention for dosing liquids comprises 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.

[0045] A method according to the invention for operating a peristaltic pump comprises the following method steps: Rotating the at least three pressure rollers via at least one friction-operated drive shaft, so that at least one pinch of the at least one hose produced by at least one pressure roller is moved along the at least one hose, adapting the at least one counter-bearing 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 in the operating state of the peristaltic pump by at least partially moving the at least one counter-bearing relative to the housing, preferably by stretching and / or relaxing the at least one spring and / or the at least one counter-bearing designed as a spring.

[0046] The adjustment of the at least one counter bearing and / or the position of the at least one counter bearing can be carried out without any intervention by an operator by the restoring spring force, in particular during the operating state.

[0047] 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, comprises the following method steps: Selection of at least one first counter bearing or at least one second counter bearing depending on a hose dimension, in particular hose wall thickness, of the at least one hose, installation of the selected at least one counter bearing selected in the previous step and of the at least one hose in the at least one housing.

[0048] This allows the peristaltic pump to be adapted to a wide variety of hose types, especially when initially equipped with at least one hose. Optimal contact pressure can be guaranteed despite the different hose designs.

[0049] In one embodiment of the method for adapting a peristaltic pump, wherein at least one first counter bearing has been selected, the following additional method steps are provided: Removal of the at least one first counter bearing, selection of at least one second counter bearing or at least one third counter bearing depending on a hose dimension, in particular hose wall thickness, of at least one further hose, installation of the selected at least one counter bearing selected in the previous step and of the at least one further hose into the at least one housing.

[0050] In particular, in addition to initially equipping the peristaltic pump with at least one hose, the counter bearing can also be replaced when replacing the hose. In particular, the additional hose has different properties than the previous hose.

[0051] Further details and preferred embodiments are shown in the figures. Fig. 1 a peristaltic pump according to the prior art in a perspective view, Fig. 2 the peristaltic pump from Fig. 1 in a sectional view, Fig. 3 an embodiment of a peristaltic pump according to the invention in a sectional view, Fig. 4 the peristaltic pump from Fig. 3 in a perspective view, Fig. 5 the peristaltic pump from Fig. 3 in an alternative perspective view, Fig. 6 the peristaltic pump from Fig. 3 in a front view, Fig. 7a-cthe peristaltic pump from Fig. 3 in three side views, Fig. 8 a further embodiment of a peristaltic pump with compression springs in a sectional view, and Fig. 9 a further embodiment of a peristaltic pump with elastic counter-form in a sectional view.

[0052] The Fig. 1 shows a peristaltic pump according to the prior art. The peristaltic pump has a housing 5, wherein the housing has 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 locking device.

[0053] Two openings are provided on the underside of the housing 5 through which the hose 4 is discharged into the atmosphere. In particular, a first outer hose section 41 and a second outer hose section 42 are provided. Depending on the direction of rotation of the pump, the first outer hose section 41 forms the inlet part of the hose 4 and the second outer hose section 42 forms the outlet part of the hose 4, or vice versa.

[0054] 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 Fig. 2 described.

[0055] The Fig. 2 shows the peristaltic pump from Fig. 1 in a sectional view. The course of the hose 4 through the pump is fully visible here. Accordingly, the hose 4 has a squeezing section 43 between the first outer hose section 41 and the second outer hose section 42, in which the pressing device 2 can locally squeeze the hose and continue the squeezing of the hose 4. Fig. 2 In particular, two pinches 15 of the hose 4 are visible. The pinch section 43 is therefore the area of the hose 4 at which the pressing device engages the hose 4 during a cycle.

[0056] The pressing device comprises three pressure rollers 7, which locally squeeze the hose 4. The pressure rollers 7 are driven directly by the drive shaft 10, which extends from the electric motor 14 into the housing 5. The drive rollers 7 are pressed by the hose 4 against the drive shaft 10, so that they can be driven by friction by the drive shaft 10. The drive shaft 10 rests against the lateral surfaces of the pressure rollers 7. In particular, the drive rollers 7 are evenly distributed azimuthally around the drive shaft 10.

[0057] 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, particularly circular-segment-shaped shape in this area. The lateral surfaces of the pressure rollers 7 move along an imaginary line, which is arranged concentrically to this shape in sections. The area in which the hose is squeezed is referred to as the squeezing section 43.

[0058] The Fig. 3 shows an embodiment of a peristaltic pump 1 according to the invention in a sectional view. In contrast to the prior art of Figuren 1 and 2 The counterbearing 3 is movable relative to the housing 5, preferably during the operating state of the peristaltic pump 1, at least in certain areas. This allows the counterbearing 3 to adapt its position to different properties of the hose 4. Varying properties of the hose 4, such as tolerances and changes in wall thickness, can also be compensated for during pump operation.

[0059] In particular, the counter bearing 3 is movable at least in regions relative to the housing 5 in at least two spatial directions of a plane E. This can, for example, correspond to a movement of the counter bearing 3 in the sectional plane of Fig. 3 The counter bearing 3 can be displaceable and / or tiltable in this plane E.

[0060] 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, the mobility is not limited to these directions.

[0061] This allows the counter bearing 3 to yield to a certain degree to the hose 4 pressed against it by the pressure device 2. Any variable properties of the hose 4, such as tolerances and / or wall thickness changes, can be compensated for. In particular, irregularities along the entire curved hose 4 can be compensated for.

[0062] The preferably rigid counter bearing 3 is subjected to a spring force in the direction of the hose 4 by means of a spring 8. The spring force preferably acts in at least two spatial directions R1, R2, R3, R4, R5 within the at least one plane E. The reacting spring force acts in a direction indicated by the arrows in the Fig. 3 opposite direction to hose 4.

[0063] In this 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.

[0064] The spring 8 engages the counter bearing 3 in an engagement area 17. The engagement area 17 extends over the entire length of the counter bearing 3.

[0065] 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, wherein the spring 8 can be inserted into the groove 11. The groove 11 is shown in the sectional view of the Fig. 3 not recognizable, it is referred to Fig. 4 referred to.

[0066] It is also provided that the spring 8 is mounted on at least one bearing unit 9, wherein the bearing unit 9 is formed as part of the housing 5. The bearing unit 9 is designed, in particular, as two bearing projections 91.

[0067] A bearing projection 91 is arranged in the area of two opposite sides of the counter bearing 3. The spring 8, which is suspended from both bearing projections 91, rests lengthwise on the counter bearing 3 between them.

[0068] The spring 8 can be suspended from the bearing projections 91 by means of the fastening rings 16. The fastening rings 16 are particularly Fig. 4 recognizable.

[0069] The hose 4 can also be placed on at least one guide part 6 that is immovable 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 on an inner wall of the housing 5.

[0070] In particular, the hose 4 can be squeezed by pressing it against the guide parts 6 by means of one of the pressure rollers 7. As can be seen from the Fig. 3 As can be seen, the hose 4 is squeezed by a pressure roller 7 by squeezing it against a first guide part 6. The hose 4 is released again in the area of a second guide part 6.

[0071] Storage unit 9, in which Fig. 3 the two bearing projections 91, is on the guide part 6, in the Fig. 3 the side part 54 of the housing 5.

[0072] Counter bearing 3 has a circular segment shape. The curve angle is slightly less than 180°.

[0073] The curve radius of the counter bearing 3 is in the Fig. 3 less than three times the uncrushed diameter of the hose 4. It is preferably provided that the curve radius is less than 2 centimeters, particularly preferably less than 1 centimeter.

[0074] The counter bearing 3 is formed as a separate component. This allows the counter bearing 3 to be replaced and individually adapted to hoses 4 with different properties, especially hose dimensions.

[0075] The counter bearing 3 is arranged in a recess of the housing 5. The recess is essentially covered by the counter bearing 3. This is the case, for example, in Fig. 4 visible.

[0076] The pressing device is essentially as in the Fig. 2 formed.

[0077] The three pressure rollers 7 are freely mounted without an axle pin and can be pressed against the drive shaft 10 by the hose 4.

[0078] By rotating the drive shaft 10, the pressure rollers 7 are driven by friction and roll along the hose 4. The drive shaft 10 can be placed against the outer surfaces of the pressure rollers 7.

[0079] The three pressure rollers 7 are held and / or guided by a pressure roller guide 2 and the hose 4 in the housing 5. Despite the free mounting of the pressure rollers 7, they are thus held in the housing 5.

[0080] This creates a very compact pressing device.

[0081] The Fig. 4 shows a perspective view of the peristaltic pump 1 from Fig. 3 .

[0082] 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. The side part 54 extends over the sides and top of the peristaltic pump 1, with the sides and top defining a substantially circular segment-shaped form. The side part 54 and the main part 53 are connected via a connecting device 13. Furthermore, the side part 54 is supported on the top of the peristaltic pump 1 on the main part 53 by means of two projections 55.

[0083] 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.

[0084] Two support projections 12 are arranged on the housing 5, in particular on the side part 54 of the housing 5. 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 region of the counter bearing 3.

[0085] The support projections 12 allow the counter bearing 3 to be moved away from the hose 4 and prevent it from being moved toward the hose 4. Since the counter bearing 3 is pulled toward the hose 4 by the spring 8, the counter bearing 3 can rest on the support projection 12.

[0086] The counter bearing 3 is movable away from the hose 4, particularly in a direction transverse to a central region of the counter bearing 3. This allows the counter bearing 3 to move outward against the spring force and adapt to the hose 4.

[0087] 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 region on at least one support projection 12.

[0088] 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, although this embodiment is not shown in the figures.

[0089] The Fig. 5 shows an alternative perspective view of the peristaltic pump 1 from the Fig. 3 . The electric motor 14 is more clearly visible here, the drive shaft 10 of which can be inserted into the housing 5 in a particularly simple manner through an opening in the housing in order to drive the pressure rollers 7.

[0090] The Fig. 6 shows a front view of the peristaltic pump 1 from the 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, is visible in the projection here.

[0091] It is intended that an opening is provided on both sides in the housing 5 for the insertion of the drive shaft 10. Thus, the electric motor 14 can be mounted on either side of the peristaltic pump 1.

[0092] The Figuren 7a bis 7c show the peristaltic pump 1 in three side views, in each case also showing the electric motor 14.

[0093] The electric motor 14 is arranged coaxially to an imaginary axis of rotation of the pressure rollers 7.

[0094] Instead of the electric motor 14, another type of motor can also be used. The only important thing is that a drive shaft 10, which can be driven in any way, extends into the housing 5 to drive the pressure rollers 7.

[0095] In an alternative embodiment (not shown), the spring 8 is not a spiral spring, but rather a rubber band. A rubber band can also run in the groove 11 along the counter bearing 3.

[0096] It is also conceivable that the spring 8 is designed as a leaf spring or plastic body spring.

[0097] The Fig. 8 shows an alternative embodiment of the peristaltic pump 1. The peristaltic pump 1 is essentially the same as in the Figuren 3 bis 7 , however, instead of acting as a tension spring, at least one spring 8 acts as a compression spring.

[0098] The at least one spring 8 engages the side of the counter bearing 3 facing away from the hose 4. In particular, three springs 8 in the form of compression springs are provided here, which engage the counter bearing 3 in three different engagement areas.

[0099] The attack areas 17 are arranged at a distance from one another, wherein the distance between two adjacent attack areas 17 corresponds approximately to one third of the total length of the counter bearing 3 and the distance between the two non-adjacent attack areas 17 corresponds approximately to the total length of the counter bearing 3.

[0100] By providing several spatially spaced engagement areas 17 of the springs 8, a restoring spring force can be applied to the counterbearing 3 in at least two spatial directions R1, R2, R3 within the plane E. The counterbearing 3 can move within the plane E and compensate for changing properties of the hose 4, such as different dimensions and / or elasticity. The restoring spring force acts in the direction opposite to the arrows (spatial directions) R1, R2, R3.

[0101] The springs 8 are mounted on a bearing unit 9, wherein the bearing unit 9 is connected to the housing 5 or is formed as part of the housing 5.

[0102] 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. This allows the peristaltic pump 1 to be designed to be particularly compact.

[0103] A spring 8 designed as a compression spring can also be designed as a leaf spring, wherein the leaf spring can be mounted on the housing 5 and presses against the counter bearing 3.

[0104] The Fig. 9 shows another alternative embodiment of the peristaltic pump 1. Apart from the counter bearing 3 and the spring 8, the peristaltic pump 1 is essentially the same as in the Figuren 3 bis 7 .

[0105] In this embodiment, the counter bearing 3 itself is designed as a spring 8 and is preloaded in the direction of the hose 4, so that a spring force acts in the direction of the at least one hose 4.

[0106] In particular, the counter bearing can be formed from an elastic material, for example as a preferably stiff rubber band.

[0107] The counter bearing 3 is attached to the housing 5. By clamping the counter bearing 3, the counter bearing 3 can move relative to the housing 5, at least in some areas.

[0108] In particular, the counter bearing 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 changing properties of the hose 4, such as different dimensions and / or elasticity. List of reference symbols

[0109] 1 Peristaltic squeeze pump 2 Pressure roller guide 3 Counter bearing 4 Hose 41 First outer hose section 42 Second outer hose section 43 Squeeze section 5 Housing 51 Front part of the housing 52 Rear part of the housing 53 Main part of the housing 54 Side part of the housing 6 Guide part 7 Pressure roller 8 Spring 9 Bearing unit 91 Bearing projection 10 Drive shaft 11 Groove 12 Support projection 13 Connecting device 14 Electric motor 15 Squeeze 16 Spring fastening ring 17 Engagement area

Claims

1. Peristaltic squeeze pump (1) with a housing (5), at least three pressure rollers (7) and at least one counter-bearing (3), wherein at least one hose (4) can be arranged between at least one of the at least three pressure rollers (7) and the at least one counter-bearing (3), 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), wherein the at least three pressure rollers (7) are rotatable by friction by at least one drive shaft (10), characterized in that the at least one counter bearing (3) of the peristaltic pump (1), preferably in the operating state of the peristaltic pump (1), is movable at least in regions relative to the housing (5).

2. Peristaltic squeeze pump (1) according to the preceding claim, wherein the at least one counter bearing (3) of the peristaltic squeeze pump (1) in the operating state of the peristaltic squeeze pump (1) is movable at least in regions relative to the housing (5) in at least two spatial directions (R1, R2, R3, R4, R5) of at least one plane (E), preferably displaceable and / or tiltable within the at least one plane (E).

3. Peristaltic squeeze pump (1) according to one of the preceding claims, wherein - at least one support projection (12) is arranged on the housing (5) and / or on at least one counter-bearing (3), wherein the at least one counter-bearing (3) is mounted on the support projection (12), preferably tiltably, particularly preferably wherein the at least one counter-bearing (3) is mounted in a central region on at least one support projection (12), and / or - the at least one counter-bearing (3) is tiltably mounted relative to the housing (5), preferably around a central region of the at least one counter-bearing (3), and / or - at least one support projection (12) is arranged on the housing (5) and / or on at least one counter-bearing (3), wherein the at least one support projection (12) allows displacement of the at least one counter-bearing (3) away from the at least one hose (4) and prevents displacement towards the at least one hose (4),and / or - the at least one counter-bearing (3) is displaceable 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).

4. Peristaltic squeeze pump (1) according to one of the preceding claims, wherein - the at least one, preferably rigid, counter-bearing (3) is acted upon by means of a spring (8) with a spring force in the direction of the at least one hose (4), preferably wherein the spring force acts in at least two spatial directions (R1, R2, R3, R4, R5) within the at least one plane (E), and / or - the at least one counter-bearing (3) is itself designed as a spring (8) and is pre-tensioned 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), wherein particularly preferably the at least one spring (8) - acts as a tension spring, and / or - acts as a compression spring, and / or - is shaped as a spiral spring, leaf spring, plastic body spring, rubber band and / or part of the housing (5).

5. Peristaltic squeeze pump (1) according to the preceding claim, wherein the at least one spring (8) - acts on the at least one counter-bearing (3) in at least one engagement region (17), wherein the at least one engagement region (17) extends 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 - acts on the at least one counter-bearing (3) in at least two engagement regions (17), wherein the at least two engagement regions (17) are arranged at a distance from one another, wherein the distance corresponds to at least one quarter, preferably at least half or particularly preferably almost the entire length of the at least one counter-bearing (3).

6. Peristaltic 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 hose (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), wherein the at least one spring (8) can be inserted into the at least one groove (11).

7. Peristaltic squeeze pump (1) according to one of claims 4 to 6,wherein the at least one spring (8) is mounted on at least one bearing unit (9), wherein the at least one bearing unit (9) is arranged on the housing (5) and / or is formed as a part of the housing (5), preferably wherein - the at least one bearing unit (9) is formed as at least two bearing projections (91), particularly preferably wherein at least one bearing projection (91) is arranged in the region of two opposite sides of the at least one counter-bearing (3), particularly preferably wherein the at least one spring (8) is formed as a tension spring, and / or - the shape of the at least one bearing unit (9) is substantially 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 wherein the at least one spring (8) is formed as a compression spring.

8. Peristaltic 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 is not movable 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 on an inner wall of the housing (5), and / or - the at least one hose (4) can be squeezed by pressing the at least one hose (4) against the at least one guide part (6) by means of at least one pressure roller (7).

9. Peristaltic squeeze pump according to claims 7 and 8, wherein the at least one bearing unit (9) is arranged on the at least one guide part (6).

10. Peristaltic squeeze pump (1) according to one of the preceding claims, wherein the at least one counter-bearing (3) has a curved, preferably circular segment-shaped, shape, preferably wherein - a curve radius of the at least one counter-bearing (3) is less than three times, preferably twice, the diameter of the at least one hose (4), and / or - wherein a curve radius is less than 2 centimeters, preferably less than 1 centimeter, and / or - a curve angle is 160° to 200°.

11. Peristaltic 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 designs 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 substantially covered by the at least one counter-bearing (3).

12. Peristaltic squeeze pump (1) according to one of the preceding claims, wherein - the at least three pressure rollers (7) are axisless and / or are freely mounted without an axis 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 by a pressure roller guide (2) and by the at least one hose (4) in the housing (5), and / or - in the operating state, at least one pressure roller (7) bears against the at least one hose (4) in a squeezing manner, 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).

13. Dosing system for dosing 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 dosing device, by means of the peristaltic pump (1).

14. A method for operating a peristaltic pump (1) according to one of claims 1 to 12, wherein the following method steps are provided: - rotating the at least three pressure rollers (7) via at least one friction-operated drive shaft (10), so that at least one pinch (15) of the at least one hose (4) produced by at least one pressure roller (7) is moved along the at least one hose (4), - 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 at least partially moving 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).

15. A method for adapting a peristaltic pump (1) according to one of claims 1 to 12, wherein at least two counterbearings (3) are provided, wherein the at least two counterbearings (3) are formed as separate components and have different properties, in particular dimension and / or material and / or elasticity, with the following method steps: - selection of at least one first counterbearing (3) or at least one second counterbearing (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 counterbearing (3) selected in the previous step and the at least one hose (4) into the at least one housing (5), preferably wherein at least one first counterbearing (3) has been selected, with the following preferred method steps: - removal of the at least one first counterbearing (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, of 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 further hose (4) into the at least one housing (5).,

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