EP3879104A1 - Hose pump - Google Patents

Abstract

The invention relates to a hose pump for conveying a fluid guided in a hose, with a hose bed (2) having a counter bearing (4) for receiving the hose, a carrier disk (1) rotatable relative to the counter bearing (2) and a plurality of circumferential supports the carrier disk (1) arranged squeezing rollers (3) and a plurality of guide rollers (5) arranged in the circumferential direction on the carrier disk (1) with a guide groove (25) running around the outer circumference in the circumferential direction, which has a first guide plane facing the carrier disk (1) (A) trains. In order to be able to ensure reliable threading in and out of different hoses with different properties in the hose bed or out of the hose bed, each guide roller (5) has a guide cylinder (26) above the guide groove (25) for guiding the hose during threading into the Hose bed (2) and / or when threading out of the hose bed (2).

Description

The invention relates to a hose pump according to the preamble of claim 1.

Such peristaltic pumps are for example from the DE 20 2016 101 907 U1 and the EP 2 924 288 A2 known. These known peristaltic pumps have a hose bed into which a hose section of a hose bent in the shape of a loop can be inserted. The known peristaltic pumps furthermore comprise a counter bearing and a carrier disk which is rotatable relative to the counter bearing and on the upper side of which a plurality of squeezing rollers and a plurality of guide rollers are arranged. Both the squeezing rollers and the guide rollers in the radially outer region of the carrier disk and in the circumferential direction of the carrier disk are each arranged equidistant from one another, with a guide roller being arranged between two squeezing rollers following one another in the circumferential direction of the carrier disk. In one embodiment of the known peristaltic pumps, for example, three squeeze rollers and three guide rollers are provided, each of which has an angular distance of 60 ° to the adjacent squeeze roller or guide roller in the circumferential direction of the carrier disk. The squeezing rollers have a smooth outer circumference and, with the carrier disk rotating in a conveying direction, press a hose inserted into the hose bed, squeezing the hose against the counter bearing, in order to transport a fluid located in the hose in the conveying direction. The cylindrical guide rollers have a circumferential guide groove on their outer circumference for receiving the radially inner tube half of the tube section and ensure exact positioning and guidance of the tube in the tube bed both when threading the tube section into the tube bed and during pumping operation.

A motor-operated device with a worm spindle can be used for the automated threading in and out of the tube section in the tube bed, as is shown, for example, in FIG EP 2 542 781 A1 is described. Such a motor-operated device for threading in and threading out the hose is, however, expensive. As an alternative to this, the tube section for threading into the tube bed can also be pressed with a hold-down device against a support surface at the entrance of the tube bed and, while the carrier disk is rotating, it can be gripped by one of the guide rollers and pulled into the tube bed The radially inner region of the hose section is received in the guide groove of the guide roller and is pressed downwards in the axial direction onto a support surface in the hose bed. Problems can arise if the hose section is too short or too long. If the hose section is too short, there is a risk that the hose section will be stretched too much during threading and thereby slip out of the guide groove of the guide roller. If the hose section is too long, problems can arise both when threading the hose into the hose bed and when operating the hose pump, because the hose section at the outlet of the hose bed forms a loop that protrudes above the support surface of the hose bed and is therefore not neatly guided in the hose bed will. During operation of the peristaltic pump, especially at very high pumping pressures, which can reach up to 20 bar when used as intended, the downstream end of a hose section that is too long may slip out of the guide groove of the guide rollers and thereby lift off the support surface of the hose bed . This can lead to the hose section automatically and unintentionally unthreading itself during operation of the hose pump and becoming tangled in the process. This can block the peristaltic pump.

Furthermore, it has been shown that the problems described when threading the hose are also very much dependent on the mechanical properties of the hose, in particular on its extensibility and friction properties. The mechanical properties of the hose depend on many different factors, such as the material composition, the age and the pretreatment of the hose, e.g. through cleaning and sterilization. The material properties of the hose can also change in the course of time during storage, for example due to the escape of material components, in particular the plasticizers contained in the plastic composition. The behavior of a hose when threading in and out can therefore be very different, which makes correct threading in and out of different hoses considerably more difficult.

Proceeding from this, the invention is based on the object of developing a hose pump of the generic type in such a way that hose sections of different pump hoses, in particular of different ones, can be reliably threaded in and out Pump hoses with a different material composition and with different material properties is made possible.

In particular, a safe threading in and out of a hose section of the hose into the hose bed of the hose pump should also be ensured if the hose section should be a little too short or too long compared to the inner circumference of the counter bearing. Furthermore, it should be prevented that the inserted hose section does not automatically unthread during operation of the hose pump, especially under high pump pressures, and that the hose pump cannot become blocked if the hose is accidentally unthreaded during the threading process or during pump operation.

These objects are achieved with a hose pump with the features of claim 1 and with the method of claim 13. Preferred embodiments of the hose pump and the method can be found in the subclaims.

The hose pump according to the invention has a hose bed for inserting a hose section of a pump hose, a counter-bearing, a carrier disk rotatable relative to the counter-bearing, a plurality of squeezing rollers, preferably arranged equidistantly from one another in the circumferential direction, and a plurality of squeezing rollers preferably arranged equidistantly from one another in the circumferential direction on the carrier disk Guide rollers with a guide groove running around their outer circumference in the circumferential direction, which forms a first guide plane facing the carrier disk. According to the invention, each guide roller above the guide groove has a guide cylinder facing away from the carrier disk for initially guiding the hose when threading into the hose bed and / or when threading it out of the hose bed.

When threading the hose into the hose bed, the guide cylinder of the guide rollers is used to initially guide the hose and, when the carrier disk is rotated in a conveying direction, enables safe initial guidance of the hose and safe introduction of the hose into the guide grooves of the guide rollers that face the carrier disk and during the operation of the hose pump, with the carrier disk rotating in a conveying direction, ensure that the hose is guided in the hose bed in an exact position.

To thread the hose into the hose bed of the hose pump, the hose is first placed in a second guide plane, facing away from the carrier disk and formed by the guide cylinders of the guide rollers, and then the carrier disk is rotated in the conveying direction. The hose is brought from the second guide plane in the axial direction towards the carrier disk into the first guide plane defined by the guide grooves. The hose section initially inserted into the second guide level can be pushed downwards towards the surface of the carrier disk when threading in an area at the entrance of the hose bed either manually by an operator or by means of a mechanical hold-down device of the hose pump in order to ensure that at a rotation of the carrier disk, the inserted hose section is grasped by (at least) one guide roller and transferred from the upper, second guide plane down into the first guide plane.

The squeezing rollers of the hose pump according to the invention are expediently at least substantially cylindrical and have a smooth outer surface, the outer circumference of the cylindrical squeezing rollers pressing the hose against the counter bearing in order to transport a fluid in the hose in the conveying direction.

The guide groove running around the outer circumference of the guide rollers is preferably adapted to the shape of the hose and the guide groove can have an at least substantially semicircular cross-section, in particular for a hose with a circular cross-section. Due to the semicircular shape of the guide groove on the outer circumference of the guide rollers, they nestle against the surface of the hose when the hose pump is in operation, without squeezing it. This ensures that the hose is routed reliably and consistently in the hose bed when the hose pump is running.

In each guide roller, an annular flange running around the outer circumference of the guide roller is preferably arranged between the guide groove and the guide cylinder arranged above the guide groove. This annular flange separates the guide groove from the guide cylinder of the respective guide roller and thereby defines the first guide plane facing the carrier disk in the region of the guide grooves and the second guide plane facing away from the carrier disk in the region of the guide cylinder Leadership roles. The second management level is axially offset from the first management level and is arranged above the first management level. When speaking of above or above, a direction that is perpendicular to the surface of the carrier disk, which forms a guide surface for a tube inserted into the tube bed, is meant. There is no restriction with regard to the orientation of the hose pump, because this can be operated both in a horizontal and in a vertical position of the carrier disk.

The formation of an upper, second guide level facing away from the carrier disk enables when threading the hose that the operator of the hose pump can initially insert the hose section to be threaded into the upper, second guide level in a simple manner and without hindrance, the hose section inserted therein being initially guided. The guide cylinder around which the inserted hose section is placed exerts a pretension on the hose in its longitudinal direction, whereby the hose is stretched slightly, depending on its stretching properties. In order to thread the inserted tube section into the tube bed, the carrier disk is then rotated in the conveying direction, a first guide roller gripping the tube section at an inlet of the tube bed. Due to the pretensioning of the hose, when the carrier disk is rotated, it is pulled from the upper, second guide level downwards onto the carrier disk into the lower, first guide level (with slight expansion of the hose) until the area of the inserted hose section at the entrance of the hose bed engages in the guide groove of the first guide roller. With further rotation of the carrier disk in the conveying direction, the inserted tube section is brought in this way over the entire circumference of the carrier disk from the upper, second guide level to the lower, first guide level, until the inserted tube section comes to rest neatly in the guide groove of all guide rollers and is therefore ready for use is inserted in the hose bed.

The pre-tension exerted on the inserted hose section by the guide cylinders of the guide rollers ensures that the hose has as little contact as possible with the counter-bearing when it is threaded in. This prevents the hose from rubbing against the counter bearing and prevents the different friction properties of different hoses from having a (negative) influence on the threading of the hose. The threading process is largely independent of the mechanical properties of the hose. This enables the same and reliable threading of different hoses, possibly with different material parameters, as well as threading of the hose that is gentle on the material.

A particularly secure initial guidance of the hose when threading is achieved if the second guide level comprises a half-groove running around the outer circumference of the guide roller, because the inserted hose section can cling to the preferred half-groove shape of the second guide level. The semi-groove-shaped design of the second guide plane, which in particular has a quarter-circle cross-section, also enables a simple and unimpeded insertion of a tube section to be threaded into the upper, second guide plane.

The height of the guide cylinders of the guide rollers, that is to say the distance between the end face of the guide cylinder and the annular flange, is preferably at least as large as the diameter of the hose for each guide roller. This also ensures good initial guidance of the hose in the second guide level when threading, because the hose is guided over its entire diameter by the guide cylinder.

The squeezing rollers are preferably at least substantially cylindrical with a flat top, the guide cylinders of the guide rollers preferably lying in the axial direction above the top of the squeezing rollers. This prevents the inserted hose section from getting tangled when threading or during operation of the hose pump and thereby blocking the hose pump. Furthermore, this arrangement enables a hose section to be threaded into the hose bed to be inserted into the second guide plane without hindrance.

The hose pump according to the invention is designed for operation with a single hose. Correspondingly, for the operation of the peristaltic pump (only) a hose is inserted into the hose bed so that the squeezing rollers press the hose against the counter bearing while the carrier disk is rotating, in order to transport a fluid in the hose in the conveying direction.

In a preferred embodiment of the hose pump, in the case of at least one guide roller of the plurality of guide rollers, the annular flange is between the guide groove and the guide cylinder is arranged axially offset upwards away from the carrier disk in comparison to the annular flange of the other guide rollers. When threading the hose while rotating the carrier disk, this ensures that the hose section inserted in the upper, second guide plane is reliably captured by this guide roller with an annular flange offset axially upwards, because the annular flange, which is offset slightly upwards, creates an enlargement of the insertion cross-section of the guide groove of this guide roller this enables easier gripping of the tube section at the entrance of the tube bed. This ensures that the hose section inserted in the upper, second guide level is always grasped by this guide roller with an axially upwardly offset annular flange when the carrier disk rotates and is pulled down into the lower, first guide level, even if the possibly in Guide rollers upstream of the conveying direction have not properly grasped the hose and pulled it down into the first guide level. At the same time, an unimpeded threading out of the hose when the carrier disk is rotated counter to the conveying direction is ensured, which will be explained in detail further below.

As already mentioned above, reliable guidance of a hose section threaded into the hose bed is achieved during operation of the hose pump if the guide groove of at least one or each guide roller has at least substantially a part-circular, in particular a semicircular, cross-section. The cross-section of the guide roller with the annular flange axially offset upward can also expediently deviate from a partially or semicircular cross-section in order to form an enlarged insertion cross-section in the area of the lower, first guide plane.

The guide roller with an axially upwardly offset annular flange has an enlarged insertion cross-section in the area of the lower, first guide level due to the axial offset compared to the other guide rollers and therefore enables easier transfer of the hose from the upper, second guide level compared to the other guide rollers Management level to the lower, first management level. The other guide rollers, on the other hand, when threading out the hose (which takes place by rotating the carrier disk counter to the conveying direction), ensure that the annular flange, which is axially offset slightly downwards towards the carrier disk, supports the hose section in the area of the outlet of the tube bed during the unwinding process and can thereby lift from the lower, first guide level to the upper, second guide level.

In a preferred embodiment, an elevation is arranged at the outlet of the tube bed, which protrudes above the surface of the carrier disk, in order to support the ring flange of at least one of the guide rollers when threading out the tube while rotating the carrier disk counter to the conveying direction.

In order to prevent that when threading the hose, a hose section can come to lie in a radially inner area (seen in relation to the carrier disk) of the outer circumference of the guide rollers and therefore not correctly grasped by this guide roller and into the hose bed between the outer circumference of the guide roller and the counter bearing can be introduced, a cover lying on the top of the guide rollers and covering the guide rollers is expediently provided. The cover is preferably designed in the shape of a cross or a star and in particular has indentations in the area between two adjacent guide rollers, which in particular can be convex or partially circular. The indentations are used for manual gripping of the cover, so that an operator can grasp the cover in an ergonomically optimized manner and manually set the carrier disk in rotation by exerting a torque on the cover and via the guide rollers attached to it. This enables a manual rotation of the carrier disk when threading in or threading out the hose, without having to use the motor of the pump for this purpose. Instead of indentations, the cover can also have bulges, which can in particular be convex or part-circular. Furthermore, openings can also be provided in the cover, into which an operator can insert one or more fingers to manually rotate the carrier disk (in the manner of a dial).

In order to set the carrier disk in rotation when the pump is operating, the carrier disk is preferably connected to a shaft which is coupled to a motor and can be made to rotate by the latter. The guide rollers and the squeezing rollers are preferably rotatably mounted on the carrier disk in order to enable friction-free rolling on the surface of the hose. However, they can also each be connected to the carrier disk in a rotationally fixed manner. The axis of rotation of the carrier disk (axis of the shaft) and the axes of the Squeezing rollers and the guide rollers run parallel to one another. If the guide rollers and the squeezing rollers are rotatably mounted on the carrier disk, they can be set in rotation by the motor (if necessary via a gear). However, the guide rollers and the squeezing rollers can also be rotatably mounted on the carrier disk without coupling to a drive (passive).

If the guide rollers arranged rotatably on the carrier disk are actively set in rotation by the motor, a safe transfer of the hose from the upper, second guide level to the lower, first guide level can be achieved when threading, if at the same time the annular flange in the conveying direction helically towards the carrier disk is inclined downward. In such an embodiment, the hose section inserted into the second guide plane is brought from the upper, second guide plane to the lower, first guide plane through the downwardly coiled annular flange when the carrier disk is rotated and the guide rollers are simultaneously actively rotated in relation to the carrier disk.

In a preferred arrangement, a guide roller is arranged between two squeezing rollers following one another in the circumferential direction on the carrier disk, with the squeezing rollers pressing a tube (or tube section) inserted into the tube bed while squeezing the tube against the counter bearing while the carrier disk is rotating in the conveying direction to transport fluid located in the hose in the conveying direction. This preferred arrangement ensures a clean guidance of the hose over the entire circumference of the carrier disk when the hose pump is in operation.

It is advantageous if the distance between the squeezing and guide rollers over the circumference of the carrier disk is not equidistant (that is, asymmetrical). In a preferred embodiment of the peristaltic pump according to the invention, the guide rollers are each set back in relation to the squeezing rollers following them in the conveying direction (direction of rotation of the carrier disk during pumping operation of the peristaltic pump), i.e. the angular distance (δ) between a guide roller and the squeezing roller following in the conveying direction of this guide roller is smaller than the angular distance (Δ) between this guide roller and the squeezing roller preceding this guide roller in the conveying direction. This arrangement of the squeezing rollers and the guide rollers on the carrier disk prevents the upstream section of the hose when the hose is being threaded into the hose bed can slip out of the guide groove of a guide roller because the guide roller when the carrier disk rotates directly, ie at only a small angular distance δ, is followed by a squeezing roller, which presses the upstream section of the hose against the counter bearing and thereby the position of the section of the already inserted into the hose bed Hose fixed in the hose bed.

When the peristaltic pump is operating, the preferred asymmetrical arrangement of the squeeze rollers and the guide rollers on the carrier disk prevents the hose from being unintentionally unraveled because each squeeze roller is immediately led by a guide roller when the carrier disk is rotated, i.e. at only a small angular distance δ, which leads the downstream section of the Holds the hose securely in the hose bed even at high pumping pressures and prevents the downstream end of the hose from being able to bulge into a loop at the outlet of the hose bed, while the section of the hose that is a little further back in the conveying direction is pressed by the squeeze roller against the counter bearing.

The amount of the relative angular difference (Δ - δ / Δ + δ) between the angular distance Δ between a guide roller and the squeezing roller preceding this guide roller in the conveying direction and the angular distance δ between this guide roller and the squeezing roller following this guide roller in the conveying direction is preferably in the range of 0 , 2 to 0.5.

The guide rollers and the squeezing rollers are expediently distributed rotationally symmetrically (with respect to the axis of rotation of the carrier disk as the center of symmetry) on the carrier disk, the symmetry angle being 360 ° / n if n is the number of guide rollers or the squeezing rollers.

In a preferred embodiment, the hose pump according to the invention has three or more squeezing rollers and an equal number of guide rollers, which are arranged on the radially outer edge of the carrier disk in such a way that the angular distance (δ) between each guide roller and the squeezing roller following in the conveying direction of a guide roller is less than 60 ° and in particular - with three guide rollers and three squeezing rollers - is preferably 45 °. The angular distance (Δ) between a guide roller and the squeezing roller preceding this guide roller in the conveying direction is correspondingly is greater than 60 ° and is in particular at least 75 °. In this arrangement with three squeezing rollers and three guide rollers, the amount of the relative angular difference is preferably Δ - δ / Δ + δ = 0.25. In an alternative arrangement with four squeezing rollers and four guide rollers, the amount of the relative angular difference is preferably Δ − δ / Δ + δ = 0.33.

According to the invention, the hose pump preferably comprises a device for monitoring the threading process when threading a hose into the hose bed. A device for monitoring the threading process that is particularly easy to implement comprises a device for detecting the torque acting on the carrier disk. By detecting the torque acting on the carrier disk, it is possible to reliably determine in a simple and reliable manner whether the hose is properly threaded. If the hose is properly threaded, the torque acting on the carrier disk increases because the motor that sets the carrier disk in rotation runs against a higher rotational resistance.

To display a properly completed threading process, a signal transmitter is preferably provided, which outputs a first signal when a torque threshold value is exceeded. In order to indicate incorrect or improper threading, the signal transmitter can also be set up in such a way that a second signal is output after a predetermined period of time has elapsed if the torque threshold value has not been reached or has not been exceeded within this period. In this way, the operator of the hose pump according to the invention expediently receives information about the state of the hose pump or the status of the threading process with each threading process.

The status of the threading process determined by the device for monitoring the threading process can also be used to control an automatic threading routine, for example by automatically starting a further threading process after a failed threading process. The same preferably also applies to the threading out of the hose, in which case a successfully unthreaded hose is inferred if the torque falls below a threshold value.

• Figur 1 : Perspektivische Darstellung einer erfindungsgemäßen Schlauchpumpe mit darin eingelegtem Schlauch, wobei der Schlauch in einer Parkposition vor dem Einfädeln oder nach dem Ausfädeln gezeigt ist;
• Figur 2 : Querschnitt der Schlauchpumpe von Figur 1 (Schnittebene mittig durch eine untere Führungsebene der Führungsrollen);
• Figur 3 : Detaildarstellung der Trägerscheibe mit den darauf angeordneten Quetsch- und Führungsrollen der Schlauchpumpe von Figur 1 in einer perspektivischen Ansicht;
• Figur 4 : Seitenansicht der Trägerscheibe mit den darauf angeordneten Quetsch- und Führungsrollen der Schlauchpumpe von Figur 1;
• Figuren 5 bis 8 : Darstellung der Schritte eines Einfädelvorgangs zum Einfädeln des Schlauchs in das Schlauchbett der Schlauchpumpe von Figur 1;
• Figur 9 : Darstellung eines Ausfädelvorgangs zum Ausfädeln des Schlauchs aus dem Schlauchbett der Schlauchpumpe von Figur 1;

These and other advantages and features of the hose pump according to the invention emerge from the exemplary embodiment described in more detail below with reference to the accompanying drawings. The drawings show:

• Figure 1 : A perspective view of a hose pump according to the invention with a hose inserted therein, the hose being shown in a parking position before threading in or after threading out;
• Figure 2 : Cross section of the peristaltic pump from Figure 1 (Section plane centered through a lower guide plane of the guide rollers);
• Figure 3 : Detailed representation of the carrier disk with the squeezing and guide rollers of the peristaltic pump from Figure 1 in a perspective view;
• Figure 4 : Side view of the carrier disk with the squeezing and guide rollers of the peristaltic pump from Figure 1 ;
• Figures 5 to 8 : Representation of the steps of a threading process for threading the hose into the hose bed of the peristaltic pump from Figure 1 ;
• Figure 9 : Representation of a threading process for threading the hose out of the hose bed of the hose pump from Figure 1 ;

In Figure 1 and Figure 2 is an embodiment of a hose pump according to the invention for conveying a fluid guided in a hose 16, in a perspective view ( Figure 1 , with inserted hose 16) or in a sectional view ( Figure 2 , with a sectional plane centered through a lower guide plane of the guide rollers). The peristaltic pump is used, for example, to convey an injection liquid for a medical, in particular an intravenous, injection, the injection liquid being carried out from a storage container into a patient hose connected to the patient, in particular intravenously. The hose pump is arranged in a pump housing 14 on which a housing cover, not shown here for reasons of clarity, is attached is articulated pivotably by means of a fastening device 18. A hold-down device is expediently formed on the housing cover.

The pump housing 14 contains a cassette holder 13 designed as a recess in the housing ( Figure 2 ) for inserting an exchangeable cassette 15 ( Figure 1 ). In the Figure 1 The partially shown cassette 15 comprises a cassette housing 15a in which a guide channel 15b is formed. The guide channel 15b serves to guide a fluid to be conveyed with the hose pump. A loop-shaped or curved section of the tube 16 protrudes from the cassette housing 15a. On the upper side of the cassette housing 15a, not shown here, the cassette 15 is connected to a plurality of connecting hoses which can be connected to storage containers for liquids (for example, injection liquids). A connector 15c is arranged on the side of the cassette housing 15a, to which, for example, a patient hose can be connected in order to connect it to the hose 16.

The peristaltic pump comprises a carrier disk 1, which is coupled to a drive via a drive shaft 10 fastened centrally to the carrier disk 1. The drive is, for example, an electric motor. When the drive is running, the carrier disk 1 is set in rotation about an axis of rotation in the conveying direction (F) via the drive shaft 10, which is connected non-rotatably to the carrier disk 1. In the exemplary embodiment shown in the drawing, the conveying direction F (direction of rotation of the carrier disk in pumping mode) is clockwise.

The peristaltic pump further comprises a hose bed 2 with a hose inlet 2a and a hose outlet 2b, as well as a counter bearing 4. The counter bearing 4 is formed by the inner circumference of a segment of a circle, which is open in the area of the hose inlet 2a and the hose outlet 2b of the hose bed 2 for the introduction of a hose 16 is. The hose bed 2 is used to receive a hose section of a pump hose (the hose section is also generally referred to below as hose 16), a fluid (for example an injection liquid for intravenous injection into the bloodstream of a patient) being guided in the hose. A tube 16 inserted into the tube bed 2 rests on a guide surface formed by the surface of the carrier disk 1. In the area of the hose outlet 2b of the hose bed 2, the counter bearing 4 tapers outwards tangentially, as can be seen from the figures.

At the hose outlet 2b there is arranged a threading-out device with an elevation 8 protruding above the surface of the carrier disk 1, as in FIG EP 2 924 288 A2 which is referred to in this regard.

On the surface of the carrier disk 1, in the radially outer section (near its outer circumference), several squeezing rollers 3 are rotatably mounted about an axis perpendicular to the carrier disk 1. The axes of the squeezing rollers 3 lie on a circular path running concentrically to the central axis of rotation of the carrier disk 1 (dashed line in Figure 2 ). In the exemplary embodiment of the hose pump according to the invention shown in the drawing here, three such squeezing rollers 3 a, 3 b, 3 c are provided and are evenly distributed over the circumference of the carrier disk 1. If in the following reference is made to the squeezing rollers 3a, 3b, 3c, each of which is configured identically, this is done with the reference symbol 3.

A guide roller 5 is arranged on the carrier disk 1 between adjacent squeezing rollers 3. In the exemplary embodiment of the hose pump according to the invention shown here in the drawing, three such guide rollers 5a, 5b, 5c are provided and distributed evenly over the circumference of the carrier disk 1 (or on the dashed circular path). If in the following reference is made to the at least essentially identically designed guide rollers 5a, 5b, 5c, this is done with the reference number 5. The guide rollers 5 are rotatably mounted on the carrier disk 1, the axes of the guide rollers 5 as well as the axes of the squeezing rollers 3, run parallel to the drive shaft 10 and also on the circular path (dashed circle in Figure 2 ) lie.

The squeezing rollers 3 and the guide rollers 5 can either be freely rotatably mounted on the carrier disk 1 or they can be coupled to the drive of the hose pump via a coupling. If the squeezing rollers 3 and / or the guide rollers 5 are coupled to the drive via a coupling, they are set in rotation by the drive in opposite directions to the carrier disk 1 when the drive is running.

The squeezing rollers 3a, 3b, 3c and the guide rollers 5a, 5b, 5c are arranged on the radially outer edge of the carrier disk 1 in such a way that the angular distance δ between each guide roller and the squeezing roller following in the conveying direction of a guide roller is less than 60 ° and - like in the illustrated embodiment of the Figures 1 and 2 - in particular is 45 °. Correspondingly, the angular distance Δ between a guide roller and the squeezing roller preceding this guide roller in the conveying direction is greater than 60 ° and is 75 ° in the exemplary embodiment shown. In the in the Figures 1 and 2 The illustrated embodiment is therefore the angular distance δ between the guide roller 5a and the squeezing roller (3a) following this guide roller 5a in the conveying direction F δ = 45 °. This preferred arrangement of the pinch and guide rollers is in the EP 3 232 059 A2 which is referred to in this regard.

From the detailed view of the Figures 3 and 4th the structure of the guide rollers 5 can be seen. The guide rollers 5 essentially have a cylindrical basic shape and, on their outer circumference (on the cylinder jacket), have a guide groove 25 running around the circumference. The guide grooves 25 of the guide rollers 5 form a first guide plane 25 in which a hose 16 inserted into the hose bed 2 is guided through the guide rollers 5 during operation of the hose pump, the carrier disk 1 being set in rotation by the drive when the pump is running and the The hose 16 engages in the guide grooves 25 of the guide rollers 5 and is thereby held on the guide surface of the hose bed 2.

Above the guide groove 25, each guide roller 5 has a guide cylinder 26, as shown in FIG Figure 3 evident. The guide cylinder 26 of each guide roller 5 faces away from the carrier disk 1 and the guide cylinders 26 of the guide rollers 5 form an upper, second guide plane B, which is arranged offset axially upwards from the first guide plane A (i.e. pointing away from the carrier disk 1). The second guide plane B is separated from the first guide plane A by an annular flange 20 running around the outer circumference of each guide roller 5. The underside of the annular flange 20 forms the upper section of the guide groove 25 for each guide roller 5 and the upper side of the annular flange 20 merges into a semi-groove 21 which is approximately quarter-circular in cross section and which is part of the second guide plane B. The height of the guide cylinder 26 of the guide rollers 5 depends on the diameter of the tube to be inserted into the tube bed Hose 16 adapted and corresponds at least to the hose diameter. The height of the guide cylinder 26 is preferably (somewhat) greater than the hose diameter.

The second guide plane B, which is formed by the guide cylinders 26 of the guide rollers 5 and the annular flange 20, lies above the flat top side 23 of the squeezing rollers 3, as can be seen from the side view of FIG Figure 4 evident. On the cylinder top 24 formed by the end faces of the guide cylinders 26, a cover 22 connecting and covering the guide rollers 5 is arranged (the cover 22 is shown in FIG Figure 2 omitted). The cover 22 is designed in a star shape here and has a central opening and several convex indentations 27.

In the embodiment of the hose pump shown in the drawings, one of the guide rollers 5 (here the guide roller 5a) has the annular flange 20 between the guide groove 25 and the guide cylinder 26 arranged above it, compared to the annular flange 20 of the other guide rollers (here the guide rollers 5b and 5c ) arranged axially offset away from the carrier disk 1 upwards. This is over Figure 4 by comparing the shape of the guide rollers 5a and 5c shown there. This guide roller 5a with axially upwardly offset annular flange 20 thus has a slightly modified cross-sectional shape of the guide groove 25 compared to the other guide rollers (5b and 5c) with a slightly enlarged cross-section in the upper section. The cross-sectional shape of the guide groove 25 of the guide roller 5a with the annular flange 20 offset axially upward therefore deviates somewhat from the shape of a semicircular groove, as from Figure 4 evident.

For the operation of the peristaltic pump, the section of the pump hose 16 protruding from the cassette housing 15a is threaded into the hose bed 2, as follows with reference to FIG Figures 5 to 8 explained:
First, an operator inserts a cassette 15 into the receptacle 13 provided for this on the pump housing 14. After the cassette 15 has been inserted into the receptacle 13 provided for it, the portion of the hose 16 protruding from the cassette housing 15a is manually placed around the guide cylinder 26 of the guide rollers 5 by the operator, as in FIG Figure 5 shown. The tube 16 is then located in the second guide plane B defined by the guide cylinder 26 of the guide rollers 25. The length of the section of the tube 16 protruding from the cassette housing 15a is based on the geometry of the Hose pump adapted so that when the hose 16 is placed around the guide cylinder 26 of the guide rollers 5, the hose 16 is brought under a slight pretension and is thereby slightly stretched in its longitudinal direction.

To thread the hose 16 into the hose bed 2, the area of the hose 16, which is located at the hose inlet 2a of the hose bed 2, is pressed down in the direction of the carrier disk 1. This can be done manually by the operator with a finger, as in Figure 6 indicated. The pressing down of the hose 16 in the area of the hose inlet 2a of the hose bed 2 can, however, also take place in an automated manner by means of a mechanical hold-down device. The mechanical hold-down device can be, for example, a lever that is movably arranged on the pump housing 14. The hold-down device can, however, also be arranged on the inside of the cover of the pump housing 14, which is pivotably articulated on the pump housing 14 by means of the fastening device 18 (for the sake of clarity, the housing cover is not shown in the drawings). The hold-down device is expediently arranged on the inside of the housing cover in such a way that the hold-down device automatically pushes the hose 16 placed around the guide rollers 5 down towards the carrier disk 1 in the area of the hose inlet 2a of the hose bed 2 when the housing cover is closed.

Simultaneously with the pressing down of the hose 16 in the area of the hose inlet 2a of the hose bed 2, the carrier disk 1 is rotated in the conveying direction (clockwise in the exemplary embodiment shown). This rotation can either be done manually by the operator or automatically by the drive of the hose pump, which is coupled to the carrier disk 1. For the manual rotation of the carrier disk 1, the operator can exert a torque on the carrier disk 1 with one hand via the cover 22. The carrier disk 1 is rotated (either manually by the operator or automatically by the drive of the hose pump) in the conveying direction until the hose 16 engages in the guide groove 25 of a guide roller 5 (in Figure 7 this is the guide groove 5c). By pressing down the hose 16 in the area of the hose inlet 2a of the hose bed 2, the hose 16 is brought into the lower, first guide plane A in this area, in which the guide grooves 25 of the guide rollers 5 are located. When one of the guide rollers 5 passes the hose inlet 2a as a result of the rotation of the carrier disk 1 in the conveying direction (here the guide groove 5c, as in FIG Figure 7 shown), the section of the hose 16 located in the lower, first guide plane A will therefore engage in the guide groove 25 of the relevant guide roller (here: the guide roller 5c). Upon further rotation of the carrier disk 1 in the conveying direction, the entire hose 16 is pulled over the entire circumference of the hose bed 2 due to the guidance in the guide groove 25 of this guide roller 5c down onto the carrier disk 1 from the upper guide plane B into the lower, first guide plane A. . The hose 16 is further slightly stretched due to a slightly larger wrap angle in the first guide plane A compared to the wrap angle in the second guide plane B. Because of the pre-tensioning of the hose 16 that is already present, the hose is also pulled radially inward, which is why the hose 16 has hardly any contact with the counter bearing 14 of the hose pump during the threading process. This minimizes friction between the hose 16 and the counter bearing 4 when threading the hose, which is why any differences in the mechanical properties and in particular with regard to the sliding friction of the hose have no influence during the threading process. For this reason, with the hose pump according to the invention, different hoses, in particular hoses made of different materials and with different friction parameters, can always be threaded precisely and reliably into the hose bed 2 in the same way.

As soon as the carrier disk 1 has carried out a complete rotation (that is to say by 360 °) during the threading process, the hose 16 is located completely in the lower, first guide plane A, as in FIG Figure 8 shown, and is thereby completely inserted in the tube bed 2. The hose pump is now ready for operation to deliver a fluid located in the hose 16.

After the section of the hose 16 protruding from the cassette has been threaded into the hose bed 2 in the manner described above, the pump can be operated in its conveying direction F to convey the fluid in the hose. For this purpose, the carrier disk 1 in the embodiment shown in the drawing is set in rotation by the drive in the conveying direction (here: clockwise), whereby the squeezing rollers 3 press the hose intermittently with squeezing against the counter bearing 4 and thereby transport the fluid in the hose in the conveying direction . The guide rollers 5 provide a secure and constant positioning of the section of the hose 16 in the hose bed 2 securely in that the hose engages in the guide grooves 25 of the guide rollers 5 and is thereby guided.

When the tube 16 has been properly threaded into the tube bed 2, it is guided through the guide groove 25 of the guide rollers 5 and runs at a small distance and essentially parallel to the surface of the carrier disk 1 and between the outer circumference of the squeezing rollers 3 and the counter bearing 4. The (radial) distance between the outer circumference of the squeezing rollers 3 is selected to be smaller than the diameter of the tube 16, so that the tube is clamped between the outer circumference of the squeezing rollers 3 and the counter bearing 4, squeezing the flexible tube.

If, during the threading process, the section of the hose 16 pressed down in the hose inlet area 2a is not supported by a guide roller 5 (in Figure 7 the guide roller 5c) should be gripped in its guide groove 25, the carrier disk 1 is rotated further in the conveying direction until the following guide roller on the carrier disk 1 in the conveying direction (in Figure 7 the guide roller 5b) passes the hose inlet 2a. This can be repeated until the hose 16 engages in a guide groove 25 of one of the guide rollers 5.

As explained above, in comparison to the other guide rollers 5b, 5c, the guide roller 5a has an annular flange 20 which is arranged offset upwards and thus an enlarged insertion cross section in the area of its guide groove 25. The enlarged insertion cross-section of the guide roller 5a ensures that the section of the hose 16 that is pressed down in the area of the hose inlet 2a is always grasped by the guide groove 25 of this guide roller 5a and thereby from the upper, second guide plane B to the lower, first Management level A is drawn. At the latest when the guide roller 5a with the upwardly offset annular flange 20 enters the area of the hose inlet 2a, the hose is gripped by the guide groove 25 of this guide roller 5c and pulled down into the lower, first guide plane A upon further rotation of the carrier disk.

A corresponding device is expediently provided in the hose pump to monitor the threading process. This device for monitoring the threading process can for example comprise a device for detecting the torque acting on the carrier disk 1. As soon as the hose has been brought completely into the lower, first guide level A during the threading process, the rotational resistance of the carrier disk 1 increases, which is why the drive of the hose pump must apply a higher torque to further rotate the carrier disk 1 (at the same rotational speed). By detecting the torque acting on the carrier disk 1, conclusions can be drawn about the status of the threading process. As soon as the torque acting on the carrier disk 1 exceeds a predetermined torque threshold value, a signal transmitter outputs a signal which indicates to the operator that the hose 16 has been properly inserted into the hose bed 2.

In the event that a threading process could not be completed properly, despite multiple attempts, if necessary, it can be provided that the signal transmitter emits a second signal after a specified period of time if the specified torque threshold value is not reached or has not been exceeded within this period is. When the second signal is output, the operator receives the information that the threading process was not successful. In this case, the operator can insert another cassette 15 into the receptacle 13 provided for this purpose on the hose pump and start a new threading process.

If a blockage of the hose pump occurs during a threading process, for example due to the hose 16 becoming tangled, this is also detected via the device for monitoring the threading process and the signal transmitter can output a corresponding signal. In the event of a pump blockage, the threading process is blocked and the operator is requested to insert a new cassette 15.

The signals can be output, for example, in the form of an acoustic signal or in the form of an indication on a display.

After the end of the operation of the hose pump, the hose 16 can be unthreaded from the hose bed 2 via an automatic unthreading routine. For this purpose, the carrier disk 1 is rotated by the drive of the peristaltic pump against the conveying direction (that is to say in the counter-clockwise direction in the exemplary embodiment shown). In order to thread out the hose, the hose arranged at the hose outlet 2b of the hose bed 2 is removed Figure 9 visible survey 8 used. The elevation 8 protrudes above the surface of the carrier disk 1 and lifts the tube 16 somewhat from the surface of the carrier disk 1 in the region of the tube outlet 2a. When the carrier disk 1 rotates counter to the conveying direction (counterclockwise), the guide roller 5c, which moves past the hose outlet 2a as a result of the rotation of the carrier disk 1, engages with its annular flange 20 under the hose 16 and thereby lifts it from the lower, first guide plane A. in the upper, second management level B, as in Figure 9 shown. With further rotation of the carrier disk 1 against the conveying direction, the hose 16 is raised over the entire circumference of the hose bed 2 from the lower, first guide level A into the upper, second guide level B, until after a complete rotation of the carrier disk 1 (by 360 °) in the conveying direction, the hose 16 is located completely and over the entire circumference of the hose bed 2 in the upper, second guide level B (corresponding to the in Figure 5 position shown). In this position, the hose 16 can be pulled upwards from the guide rollers 5 by the operator and removed from the hose pump together with the cassette 15.

The device for monitoring the threading process is preferably coupled to a control device of the hose pump. This enables the execution of programmed threading and threading routines by the control device, the device for monitoring the threading process recording the status of the threading process and, if necessary, restarting the threading process if the hose could not be successfully threaded in, or terminating the threading process when the Hose could be threaded successfully. The same applies to the threading out process.

The invention is not limited to the embodiment shown here in the drawing. For example, the number of squeezing rollers 3 and guide rollers 5 can be selected differently. However, it is expedient to provide the same number of guide rollers and squeeze rollers, so that a guide roller 5 is assigned to each squeeze roller 3. For example, four squeezing rollers 3 and four guide rollers 5, which are arranged in alternating order on the carrier disk 1 so that their axes lie on a circular path concentric about the axis of rotation A of the carrier disk 1, can be provided. The angular distances between the squeezing rollers and between the guide rollers are equidistant from one another. With four guiding and squeezing rollers each, this distance between the guiding or squeezing rollers is 90 °. The angular distance between the Squeezing rollers 3 and the guide rollers 5 can expediently be different, as described above, or they can also be equidistant.

Instead of the cover 22 (or in addition), a central cylinder projecting above the surface of the carrier disk 1 can be arranged in the center of the carrier disk 1 coaxially to its axis of rotation, which cylinder surrounds the drive shaft 10 and its outer diameter at least approximately to the outer circumference of the radially further outward squeezing rollers and leadership roles is enough. There is a (possibly) small distance between the outer circumference of the central cylinder and the outer circumference of the squeezing rollers and the guide rollers. The central cylinder can be designed as a hollow cylinder or also as a solid cylinder and is expediently connected to the carrier disk 1 in a rotationally fixed manner. When threading the hose, the central cylinder prevents it from coming to rest on the radially inward-facing side of the guide rollers 5 and therefore cannot be properly threaded into the hose bed 2 between the outer circumference of the squeezing rollers 3 and the counter bearing 4. For this purpose, the radial distance between the outer surface of the cylinder and the outer circumference of the guide rollers should be smaller than the diameter of the hose to be inserted into the hose bed. The height of the central cylinder (in the axial direction) is expediently adapted to the height of the guide rollers and has at least the same height as the guide rollers.

Claims (15)

Peristaltic pump for conveying a fluid guided in a hose, with a hose bed (2) having a counter bearing (4) for receiving the hose, a carrier disk (1) rotatable relative to the counter bearing (2), a plurality of circumferential supports on the carrier disk (1 ) arranged squeezing rollers (3) and a plurality of guide rollers (5) arranged in the circumferential direction on the carrier disk (1) with a guide groove (25) running around the outer circumference in the circumferential direction, which forms a first guide plane (A) facing the carrier disk (1) , characterized in that each guide roller (5) has a guide cylinder (26) above the guide groove (25) for guiding the hose when threading into the hose bed (2) and / or when threading it out of the hose bed (2). Peristaltic pump according to Claim 1, characterized in that an annular flange (20) running around the outer circumference of the guide roller (5) is arranged between the guide groove (25) and the guide cylinder (26) on each guide roller (5). Peristaltic pump according to claim 2, characterized in that with at least one guide roller (5a) of the plurality of guide rollers (5) the annular flange (20) between the guide groove (25) and the guide cylinder (26) compared to the annular flange (20) of the other Guide rollers (5b, 5c) are arranged offset away from the carrier disk (1). Peristaltic pump according to one of claims 2 or 3, wherein the guide cylinder (26) together with the annular flange (20) forms a second guide plane (B) which is axially offset to the first guide plane (A) and which, when it is threaded into the hose bed (2), initially Guiding the hose and / or for introducing tensile stress on the hose is used. Peristaltic pump according to claim 3 or 4, characterized in that the first guide plane (A) and the second guide plane (B) are separated from one another by an annular flange (20) running around the outer circumference of each guide roller (5), the annular flange (20) being parallel to the Guide groove (25) or in the conveying direction (F) can be inclined helically sloping towards the carrier disk (1). Hose pump according to one of Claims 3 to 5, characterized in that the second guide plane (B) comprises a half-groove (21) running around the outer circumference of the guide roller (5). Hose pump according to one of the preceding claims, characterized in that the height of the guide cylinder (26) for each guide roller (5) is at least as great as the diameter of the hose. Hose pump according to one of the preceding claims, characterized in that the squeezing rollers (3) are at least substantially cylindrical and have a flat top (23), the guide cylinders (26) of the guide rollers (5) in the axial direction above the top (23) ) of the squeegee rollers (3). Peristaltic pump according to one of the preceding claims, characterized in that each guide roller (5) has an upper side (24) formed by the end face of the guide cylinder (25) and that the guide rollers (5) on the upper side (24) of each guide roller (5) connecting lid (22) is arranged. Peristaltic pump according to claim 9, characterized in that the cover (22) is cross-shaped or star-shaped and preferably in the area between has two adjacent guide roller (5) indentations (27), wherein the indentations (27) can in particular be convex, rectangular or part-circular. Hose pump according to one of the preceding claims, characterized in that the guide groove (25) of at least one guide roller (5) has at least essentially a partially circular, in particular a semicircular cross-section and / or that the second guide plane (B) of each guide roller (5) passes through a half-groove (21) is formed, which in particular has a quarter-circle cross-section. Hose pump according to one of the preceding claims, characterized in that a single hose is inserted into the hose bed (2) and the squeezing rollers (3) press the hose against the counter bearing (4) while the carrier disk (1) is rotating, squeezing the hose To transport fluid in the hose in the conveying direction. Method for threading a hose into a hose bed (2) of a hose pump with a counter bearing (4), a carrier disk (1) rotatable relative to the counter bearing (4), a plurality of squeezing rollers (3) arranged in the circumferential direction on the carrier disk (1) and a plurality of guide rollers (5) arranged in the circumferential direction on the carrier disk (1), the guide rollers (5) having on their outer circumference a circumferential guide groove (25) which forms a first guide plane (A) facing the carrier disk (1) , characterized in that, for threading the hose into the hose bed (2), the hose is first placed in a second guide plane (B) of the guide rollers (5) facing away from the carrier disc (1), then the carrier disc (1) is rotated in the conveying direction and thereby the hose is brought from the second guide plane (B) in the axial direction onto the carrier disk (1) into the first guide plane (A). Method according to claim 13, wherein when the hose is inserted into the second guide plane (B) of the guide rollers (5), a pre-tension is generated on the hose. Method according to Claim 13 or 14, characterized in that the torque acting on the carrier disk (1) is detected at least when threading the hose and, when a torque threshold value is exceeded, a first signal and, additionally or alternatively, a second signal is output if a predetermined Duration of the torque threshold value has not been reached or exceeded.

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