Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B43/00—Machines, pumps, or pumping installations having flexible working members
  • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
  • F04B43/1284—Means for pushing the backing-plate against the tubular flexible member

Definitions

• 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.
• Peristaltic pumps are already well-known in the art. They are used, among other things, in dosing systems for dispensing 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. This can generate pressure or a vacuum and convey liquids in the hose.
• the at least one local pinch is realized by pressing the at least one hose against the at least one counter-mold by means of the at least one pressing device.
• the pressing device is moved such that the at least one local pinch moves along the hose.
• Radial peristaltic squeeze pumps are particularly known, in which in which the hose lies in a curved, particularly circular, counter-shape, and the pressing elements of the pressing device describe a curved path, particularly a circular path.
• Linear peristaltic pumps are also known, in which the hose is arranged along a straight path.
• 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.
• the printed matter WO 2004/044425 A1 shows 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.
• 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.
• the object of the present invention is to create a peristaltic pump that avoids the stated disadvantages of the prior art.
• 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.
• 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.
• the counter bearing can thus be adapted to the properties of the at least one hose.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• a movement or force that occurs or acts in one spatial direction can have a sign.
• 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.
• 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 in the operating state of the peristaltic pump Tolerances and wall thickness changes of at least one hose can be better compensated.
• 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.
• 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.
• 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.
• the displacement movement is acted upon by a spring with a restoring spring force.
• 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.
• 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.
• 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.
• 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.
• 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.
• the spring force can be made to act in at least two spatial directions on at least one plane.
• the spring force can act evenly over a large portion of the at least one counterbearing.
• the counterbearing can, in turn, transmit this force evenly to the at least one hose.
• 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.
• the at least one spring rests on the side of the at least one counter-bearing facing away from the at least one hose.
• the at least one spring rests along the entire length of the at least one counter-bearing.
• the spring can partially wrap around a curved counter-bearing.
• 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.
• 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.
• 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.
• 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.
• 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 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-form 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.
• 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.
• 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.
• the at least one guide part is formed as a part, particularly preferably a side part of the housing, and that 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 at least one hose is applied to at least one counter bearing.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• the pressure rollers can be friction-driven by rotating the drive shaft.
• 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.
• At least one pressure roller rests against at least one hose in a squeezing manner.
• 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.
• 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.
• 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.
• 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.
• 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.
• peristaltic pump 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.
• the counter bearing can also be replaced when replacing the hose.
• the additional hose has different properties than the previous hose.
• 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.
• 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.
• 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.
• a pressing device for pressing the hose 4 which is Fig. 2 described.
• 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.
• 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 squeeze the hose locally and can continue the squeezing of the hose 4.
• 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.
• 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.
• 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 this area, particularly in the shape of a segment of a circle.
• the outer 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.
• the Fig. 3 shows an embodiment of a peristaltic pump 1 according to the invention in Sectional view.
• 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.
• 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.
• 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.
• the mobility is not limited to these directions.
• the preferably rigid counter bearing 3 is moved by means of a spring 8 with a spring force in the direction of the hose 4
• the spring force acts preferably in at least two spatial directions R1, R2, R3, R4, R5 within at least one plane E.
• the retroactive spring force acts in a direction indicated by the arrows in the Fig. 3 opposite direction to hose 4.
• the spring 8 is designed as a tension spring and pulls the counter bearing 3 against the hose 4.
• the spring 8 is designed as a spiral spring.
• 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.
• 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.
• 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.
• a bearing projection 91 is arranged in the area of two opposite sides of the counter bearing 3.
• 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.
• 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.
• 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.
• Counter bearing 3 has a circular segment shape.
• the curve angle is slightly less than 180°.
• 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.
• 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.
• 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.
• the pressing device is essentially as in the Fig. 2 formed.
• 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.
• 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.
• 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.
• the Fig. 4 shows a perspective view of the peristaltic pump 1 from Fig. 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.
• 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.
• 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.
• 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.
• 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.
• Away from the hose 4 is the counter bearing 3, in particular in a direction transverse to a central region of the counter bearing 3, This allows the counter bearing 3 to 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 region on at least one support projection 12.
• 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.
• 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 particularly easily through an opening in the housing 5 in order to drive the pressure rollers 7.
• 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 electric motor 14 can be mounted on either side of the peristaltic pump 1.
• FIGS. 7a to 7c show the peristaltic pump 1 in three side views, in each case also showing the electric motor 14.
• the electric motor 14 is arranged coaxially to an imaginary axis of rotation of the pressure rollers 7.
• a drive shaft 10 which can be driven in any way, extends into the housing 5 to drive the pressure rollers 7.
• 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.
• the spring 8 is designed as a leaf spring or plastic body spring.
• the Fig. 8 shows an alternative embodiment of the peristaltic pump 1.
• the peristaltic pump 1 is essentially the same as in the Figures 3 to 7 , however, instead of acting as a tension spring, at least one spring 8 acts as a compression spring.
• the at least one spring 8 engages the side of the counter bearing 3 facing away from the hose 4.
• three springs 8 in the form of compression springs are provided here, which engage the counter bearing 3 in three different engagement areas.
• 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.
• 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.
• 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.
• 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.
• 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.
• the Fig. 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 essentially the same as in the Figures 3 to 7 .
• 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.
• the counter bearing can be formed from an elastic material, for example as a preferably stiff rubber band.
• 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.
• 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.

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

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• 2022
  • 2022-02-03 AT ATA50058/2022A patent/AT525934B1/de active
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