EP3366923A1 - Pompe à liquide - Google Patents

Pompe à liquide Download PDF

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Publication number
EP3366923A1
EP3366923A1 EP18158138.0A EP18158138A EP3366923A1 EP 3366923 A1 EP3366923 A1 EP 3366923A1 EP 18158138 A EP18158138 A EP 18158138A EP 3366923 A1 EP3366923 A1 EP 3366923A1
Authority
EP
European Patent Office
Prior art keywords
pressure
base body
liquid pump
cover element
cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18158138.0A
Other languages
German (de)
English (en)
Other versions
EP3366923B1 (fr
Inventor
Philipp Winking
Oliver SCHÄFER
Andreas Iske
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
B Braun Avitum AG
Original Assignee
B Braun Avitum AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by B Braun Avitum AG filed Critical B Braun Avitum AG
Publication of EP3366923A1 publication Critical patent/EP3366923A1/fr
Application granted granted Critical
Publication of EP3366923B1 publication Critical patent/EP3366923B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B43/1276—Means for pushing the rollers against the tubular flexible member
    • 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
    • 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
    • F04B43/1261—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 the rollers being placed at the outside of the tubular flexible member
    • 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 liquid pump, and in particular relates to an occlusive peristaltic pump for delivering blood, sterile dialysis fluid, 0.9% saline solution and the like, in general also medicaments and / or fluids to be pumped in an extracorporeal blood treatment, in which an occlusion of a fluid-carrying tube by a spring-loaded roller against a circular shaped tread takes place.
  • a peristaltic pump is generally based on pressure and relief, which act alternately on a waveguide, such as a hose or a tube.
  • At least one rotating element exerts pressure on the waveguide and cyclically along a predetermined portion of the waveguide so that its degree of opening is reduced and a sealing effect is created between the suction and discharge sides of the pump. Without pressure, d. H. After the rotating element has passed the predetermined portion of the waveguide, the waveguide returns to its original state and forms a vacuum, which sucks in the waveguide located content in the waveguide and pulls a substance to be pumped into the pump. Frequently, for a low-pulsation volume flow and a lower mechanical load of the waveguide, rotating elements are offset relative to one another and arranged circumferentially.
  • Known occlusive peristaltic pumps are, for example, those in which at least one roller is acted upon by a spring on a rocker with a force.
  • the rocker is mounted by means of an additional bolt on a base body and arranged movable as a lever.
  • the bearing of the roller is located in the rocker.
  • the spring is at the level of the roll or further behind the roll.
  • a power transmission is done by positive engagement or adhesion, the power transmission can use without grasping or an independent orientation can be done at the onset of power transmission.
  • Self-centering bayonet locks with separate flap or unsprung cap may be provided.
  • a disadvantage of the known arrangements is in particular that the role of the occlusion of the hose is acted upon by a hinged rocker arm as a lever with spring force, resulting in an increased number of necessary parts, a greater processing effort and increased assembly costs.
  • the invention is therefore based on an object to provide a pump of the aforementioned type, in which a resilient mounting at least the pressure roller without deterioration of the treatment result can be realized inexpensively.
  • a linear guide is arranged in at least one housing section, for example a cover section and / or a bottom section of the housing of a pump rotor, which does not require additional bearings.
  • An intended for the pressure build-up for occlusion spring is located directly behind the pinch roller.
  • An angle of the linear guide is determined by the determination of the direction of force and the force size for the occlusion of the tube.
  • the linear guide of the rocker is mounted in the direction of the expended occlusion force, wherein the angle of the linear guide preferably comes to lie in the range of 35 ° to 55 ° and an optimum at 42 ° is expected. This angle is between an occlusion site of the tube and a stop point or bearing point of a drive shaft of the pump.
  • the linear guide can be bevelled to compensate for a Ausformschräge example, a radius of a Umlaufwandung.
  • the additional force component through the chamfering can be absorbed by storage within a transmission. To wear on the linear guide To minimize this, for example, this can be designed as a profile (eg dovetailed).
  • a straight contact of the rocker on a lid and / or bottom can be made oblique to reduce a friction time and thus wear and jamming.
  • friction-optimized material pairings ie those with a low coefficient of friction, are used which do not favor jamming.
  • a mating of PBT (polybutylene terephthalate) with PBT may be provided, or a mating of PBT with PI (polyimide) + graphite + PTFE (polytetrafluoroethylene) may be used as an insert or molding in the guide.
  • At least one roller is mounted outside, so that no spacers are needed, and bearings are held from the outside via a press fit.
  • the rocker itself is preferably made of plastic injection molding, and in turn fixed the bearing via a press fit in the rocker.
  • covers are held by cylindrical pins on the rocker.
  • the spring is preferably fixed behind the rocker, secured by a cylindrical pin and damped by silicone at the ends of a (small) cylindrical pin.
  • the existing spring and rocker component is pre-assembled and can be checked before installation on, for example, compliance with a predetermined spring force specified.
  • a main body may be reinforced with a metal sheet for improved retention of the occlusion force on pull-throughs for the rocker.
  • a sheet-side recess allow mounting via a bayonet lock, which can be secured by a rotation of 90 ° by the spring force in the bias voltage.
  • Both wings can thus be mounted in the main body (before).
  • Pre-assembly preferably takes place from the bottom side by inserting the magnets.
  • a pre-assembly of the lid by inserting the cap for power transmission, preferably with suspension is possible.
  • a suspension for releasing the positive connection at pressures of the corresponding locking plate can be provided.
  • a centering of the pump rotor is characterized by a profile in the bottom of the pump rotor and realized a corresponding profile on the drive shaft.
  • the wings are securable by placing the lid and bottom.
  • a tread may be separable for a better production of better cutting of the bottom and / or lid, the use of near-endgeometriemahem raw material is possible.
  • a bottom plate also serves as a cover of a transmission receiving gear section. In this area, a fit over preferably taper pins and a screw fixation can be provided, resulting in a smaller number of geometric tolerances with respect to the tolerance of the occlusion site results and larger tolerances can be compensated.
  • the tread can be designed with the bottom plate as injection molding, in which case the compensation of the Ausformschräge can be done by the pump rotor or the Ausformschräge is removed by rework.
  • the back of the bottom of the pump can be used as a gear cover.
  • An externally applied aperture can be designed for functional differences (use of a multi-connector or predetermined tube set).
  • Embodiments of the invention thus advantageously have fewer parts, are easier to assemble and inexpensive to produce.
  • a liquid pump according to the principle of an occlusive peristaltic pump, comprising: a rotatable pump rotor in the liquid pump, consisting of a base body, a first, top side fixed to the body lid member and a second, fixed to the base member at the bottom lid member; and at least one pressure element accommodated in the base body with a pressure body for occluding a liquid-conducting waveguide section against a circularly shaped running surface on a housing section of the liquid pump, wherein the at least one pressure element is linearly guided by the first cover element and the second cover element in the effective direction of a occlusion force.
  • the first and the second cover element preferably each have at least one first protruding relative to the main body in the effective direction of the occlusion force Cantilever on; the at least one pressure element on the outside of the housing has recesses which correspond positionally to the at least one first protrusion on the first and the second cover element, respectively; and in the state of the pressure element received in the base body, the first projections engage the first and second cover elements in the recesses of the pressure element which are located on the outside of the housing and form a linear guide of the pressure element.
  • an angle of the linear guide which exists between an occlusion point of the waveguide and an abutment point of a drive shaft of a drive for rotation of the pump rotor, determined by the force direction and the force magnitude for occlusion of the waveguide and is preferably in a range of 35 ° to 55 °, optimally at 42 °.
  • the linear guide for compensating a Ausformschräge and / or to reduce a friction period and / or a Verklemmungsne Trent bevelled formed, and / or the linear guide wear-reducing executed in a predetermined profile.
  • the linear guide is produced using friction-optimal material pairings, wherein material pairings are preferably PBT with PBT or PBT with PI + graphite + PTFE, designed as an insert in the linear guide.
  • material pairings are preferably PBT with PBT or PBT with PI + graphite + PTFE, designed as an insert in the linear guide.
  • At least the first or the second cover element at least one with respect to the base body outside the effective direction of the occlusion force and in the rotational direction in front of the pressure element projecting second projection, wherein the second projection is arranged to a subsequently occluded by the pressure element waveguide section at the level of the pressure body hold down.
  • the pressure body is a roller-shaped element of preferably metal, which is externally mounted without a spacer in the pressure element by means of press-fits held on the outside.
  • the pressure body is spring-loaded such that a spring surrounds a rear housing extension and is secured in the housing extension with a pin-shaped securing means against falling out, wherein the spring is preferably a compression spring.
  • the base body at least one passage for at least one pressure element and in the at least one passage on a reinforcing element, wherein the reinforcing element is annularly formed with a recess which forms a bayonet closure in operative connection with the pin-shaped securing means on which by passing the pin-shaped securing means the recess and then rotation of pressure element with securing means by 90 ° in the bias of the spring by the spring force in the bias of the pressure element is communiquébar.
  • the second, lower-side cover element is configured to receive pre-mountable magnets and to provide a centering of the pump rotor by an incorporated profile, which corresponds to a profile on a drive shaft;
  • the first, upper-side cover element is configured to pre-mount a cap element for power transmission from a drive shaft and at least one spring to be supported against the main body and / or the second cover element; is arranged between the base body and the first cover element an actuatable securing element which is configured to release a spring-loaded by means of the spring positive engagement between the base body and the first cover element when actuated; and the first and the second cover element are configured to secure the at least one pressure body in the state fixedly placed on the base body.
  • the base body and the first and the second cover element are made of an injection-moldable plastic; and a housing of the liquid pump includes a first housing part having a portion in which the round shaped tread is formed, and at least a second housing part comprising a bottom plate mechanically connectable to the bottom housing plate configured as an engine cover and / or transmission cover at the rear wherein the first housing part and the at least one second housing part of a machinable Material are made; or the first housing part and the at least one second housing part are made of an injection-moldable plastic.
  • a basic structure of a liquid pump in the manner of an occlusive peristaltic pump which can be arranged, for example, as a blood pump in extracorporeal blood treatment in or on an apparatus for extracorporeal blood treatment, such as a dialysis machine, without being limited thereto with reference to the schematic diagram in FIG Fig. 1 and Fig. 6 described.
  • Fig. 1 shows a schematic diagram of a liquid pump 100 in open plan view with built pump rotor 20, two linear guided and constructed as such pressure elements 40, round shaped running surface (pump bed) 60 and inserted waveguide (hose) 80 (shown in broken line) according to one embodiment.
  • the liquid pump 100 consists at least of the pump rotor 20, which can be installed in a housing of the liquid pump 100 and on which a predetermined number of movable bodies are movable relative to a main body (middle part) 30 which forms part or a middle part of the multi-part pump rotor 20
  • Pressure elements 40 ie at least one pressure element and in the present embodiment, two pressure elements is mounted.
  • a pressure element 40 may also be referred to as an occlusion element, since it acts on the waveguide 80 with a waveguide closing force or occlusion force of predetermined direction and size and thereby a local constriction and / or closure point migrating with the rotational movement of the pressure element 40 during rotation of the pump rotor 20 (Occlusion) produced on the waveguide 80.
  • each pressure element 40 a pressure body 42, for example, a (pressure) roller or roller preferably metal, stationary and rotatable about a coaxially extending central axis thereof.
  • the pressure element 40 is supported on the main body 30 via a spring 45, which also generates the pressing force against the waveguide 80.
  • the peripheral surface or lateral surface of the pressure body 42 is arranged to run on the waveguide 80, for example, a hose.
  • the pump rotor 20 is constructed in several parts preassembled and consists fundamentally of the main body 30 (in Fig. 1 not shown) as well as an upper-side, first cover element 22 mounted thereon and an underside, second cover element 24 (in FIG Fig. 1 not shown), and is used as such in the housing of the liquid pump 100, the inside of the round shaped tread 60, against which the pressure body (pinch rollers) 40 start at intermediate waveguide (hose) 80, and, if necessary, further housing sections for example (not ) and a drive or motor (not shown).
  • the pump rotor 20 is further drivable in the housing via a drive shaft, which is frictionally coupled via the transmission and / or a drive motor for rotation of the pump rotor 20.
  • Internal parts such as the pressure element 40, the base body 30, the cover elements 22, 24 and the like (and thus the pump rotor 20) may be produced by weight advantageous example of a plastic injection molding, while the housing or pump housing made of a machineable metal and each Anvikigen 42nd , the spring 45, securing and / or holding parts, such as cylindrical pins 46 and / or the plastic injection molding reinforcing or stiffening components, such as reinforcing plates 32 may also consist of a metal, or alternatively the housing or pump housing made of an injection-moldable plastic material and each pressure body 42, the spring 45, securing and / or holding parts, such as cylindrical pins 46, and / or the plastic injection-molding reinforcing or stiffening components, such as reinforcing plates 32, in turn may consist of a metal.
  • the pump rotor 20 rotatable in the liquid pump 100 is composed of the first, upper cover element 22, the base body 30 and a second, lower cover element 24, wherein the cover elements 22, 24 are respectively fixedly connected to the base body 30 or fixed thereto ,
  • the first, upper cover element 22 corresponds in its essential circumferential course to that of the main body 30, with the exception of at least one first projection (first arm-shaped extension) 26 and a second projection (second arm-shaped extension) 27.
  • the first projection 26 extends in the effective direction of an occlusion force plate-shaped and flush or flush to the upper surface of the first cover member 22 relative to the base body 30 above.
  • the first protrusion 26 is formed as a plate-shaped protrusion of lesser height than the first lid member 22 projecting flush with the upper surface thereof toward the tread 60.
  • the number of protrusions 26 corresponds to the number of pressure elements 40 arranged in the liquid pump 100.
  • the second projection 27 is also flush with the upper surface of the first lid member 22 and arm-shaped in the rotational direction in front of the first projection 26 and having a height which may correspond to the height of the first lid member 22, and serves with a corresponding predetermined length to a in Subsequent to the pressure element 40 depressed occluded waveguide section at the level of the pressure body 40 hold down.
  • the second projection 40 can slide in front of the pressure body 40 over the surface of the waveguide 80, bringing the height of the waveguide 80 to the level of the pressure body 42 (the roller) so that it then rests on the surface of the waveguide 80 and can apply the occlusion force.
  • the number of protrusions 27 corresponds to the number of pressure elements 40 arranged in the liquid pump 100.
  • a center section of the first cover element 22 has an opening 28 for a cap element 29 or a cap (running cap), which may be formed, for example, approximately rectangular.
  • the cap member 29 is configured to provide or at least support power transmission from the drive shaft guided on the bottom side by the pump rotor 20 and connected to the drive motor and / or the transmission.
  • the base body 30 has at least one opening 31 opening into its interior for receiving the pressure element 40, which forms a passage for the front side.
  • a reinforcing element 32 for example a basically annular sheet metal part arranged to improve the occlusive force holding ability.
  • the reinforcing element 32 has at least one recess 33, through which a provided on the pressure element 40 pin-shaped securing means 46, such as a cylindrical pin, out and secured against rotation of the reinforcing member 32 and thus against loosening.
  • the reinforcing member 32 is annularly formed with the recess 33, which forms a bayonet closure in operative connection with the pin-shaped securing means 46, which allows mounting of the pressure element 40 via the bayonet lock and on by passing the pin-shaped securing means 46 through the recess 33 and then rotation of pressure element 40 with fixed thereto securing means by 90 ° in the bias of the spring 45 by the spring force in the bias of the pressure element 40 is securable.
  • the at least one or the plurality of pressure elements 40 can be mounted or preassembled in the main body 30.
  • the second, lower cover element 24 also essentially corresponds to the circumferential course of the main body 30, with the exception of at least the first protrusion 26 provided here.
  • the second protrusion 27 is not required on the second cover element 24 and is therefore not provided thereon.
  • the first projection 26 is also plate-shaped or tabular on the second cover element 24 in the direction of action of the occlusion force and is arranged flush with the lower surface of the second cover element 24 with respect to the base body 30.
  • the first projection 26 is formed as a plate-shaped projection of lesser height than the second lid member 24 projecting flush with the lower surface thereof outwardly.
  • the number of protrusions 26 also corresponds to the number of pressure elements 40 arranged in the liquid pump 100, even in the case of the second cover element 24.
  • a center section in the bottom surface of the second cover element 24 preferably has a profile (not shown) for centering the pump rotor 20, the profile corresponding to a profile on the drive shaft.
  • the lower lid member 24 is configured to receive pre-mount magnets for speed measurement in, for example, the projections 26 and provide centering of the pump rotor 20 through the machined profile corresponding to a profile on a drive shaft, and is the first, top-side Cover member 22 configured to also pre-mount the cap member 29 for the transmission of power from the drive shaft and at least one against the base body 30 and / or the second cover member 24 supported (not shown) spring.
  • the pressure element 40 has a multi-part, for example, three-part, housing 41, the parts of which, for example, injection-molded from a plastic and by means of inner cylindrical pins (48 in Fig. 6 ) are connectable.
  • the contact pressure body 42 consists of an externally mounted roller body or an externally mounted roller such that outer bearing (49 in FIG Fig. 6 ) from the outside via press fits (50 in Fig. 6 ) are durable in outer housing parts of the multi-part housing 41 and no spacers are needed.
  • the pressure element 42 is preassembled by inserting or fixing one of the bearings of the pressure body 42 in the press fit 50 of the housing parts and guiding or fixing the other housing part on the cylinder pins 48 until the other bearing of the pressure body 42 in the interference fit 50 of the other housing part comes to rest or is fixed in it.
  • Pin-shaped extensions 47 of the housing in the side region of the pressure body 42 are configured to provide a guide for the waveguide 80 or tube to guide the waveguide 80 above the pressure body 42 and prevent it from slipping off the pressure body 42.
  • a housing extension 44 is arranged, via which a spring 45 is slidably and by means of a securing means serving as a securing pin 46 (cylinder pin) can be fixed.
  • the spring 45 can with a predetermined Preload can be placed, and the thus pre-mounted pressure element 42 can be secured by means of the securing pin 46 in the bayonet lock 32, 33 in the opening 31 of the base body 30, as described above and in Fig. 4 is shown.
  • the locking pin 46 is attenuated by means of, for example, silicone at its ends.
  • the pre-assembled component can also be checked before installation in the base body 30, for example, compliance with a specified spring force.
  • recesses 43 are arranged on both sides, which correspond in shape and size of the first projection 26 on the first and the second cover element 22, 24.
  • the first and the second cover member 22, 24 mounted on the base body 30 and connected thereto, engage the projections 26 of the first and second cover part 22, 24 in the recesses 43 of the pressure element 40 and form An operative connection with the same a linear guide of the pressure element 40, in which the pressure element 40 on the one hand by the placement of the first lid member 22 and lid and the second lid member 24 and bottom is secured against rotation and against falling out and on the other hand simultaneously a longitudinal movement of the pressure element 40 in a through the linear guide, which is formed by the engagement of the recess 43 and the projection 26, defined direction (force direction) is possible.
  • Fig. 5 shows a plan view of the base body 30 with removed first cover device 22 and attached cap member 29th
  • sub-device allows assembly and release of the cap member 29 by means of a combination of a spring 66 and an actuatable example by pressing and thereby moving into a recess on the base body 30 fuse element 62, for example a locking plate with a recess along a longitudinal side of the same.
  • the cap member 29 (running cap) allows in its released position, an independent rotation of the pump rotor 20 and the drive shaft in the manner of a freewheel.
  • the cap member 29 is inserted into the opening 28 in the region of the center of the first cover member 22 and arranged to produce a releasable positive / non-positive connection and thereby a power transmission between the drive shaft and the main body 30 (central part of the pump rotor 20).
  • the positive / non-positive connection is made by the securing element 62, which is slidably provided on the surface of the base body 30, and in a first position (locking position) having a first width, which is greater than the recess, in an undercut recess of the cap member 29 engages and in a second position (release position), in which the recess is located and the securing element 62 has a smaller width, is moved out of the undercut in the cap member 29.
  • the cap member 29 is pressed by mounted against the second cover member 24 springs 66 upwards and solves the positive connection between the cap member 29 and the drive shaft, so that the pump rotor 20 is freely rotatably mounted on the drive shaft.
  • the cap member 29 is at least made in two parts and includes a molding 64 with at least one Mit videprofil Swiss 68 along a predetermined height of the molding 64, which in the locking position in a counter-profile on the body 30 engages and rotatably entrains and pressed in the release position by the spring force of the springs 66 upwards out of engagement with the mating profile and is freely rotatable.
  • the driver profile piece 68 is on the upper side, d. H. to the first cover member 22 (cover) out, with a cover part of the cap member 29 pluggable connectable.
  • the insertion or assembly of the Mit Converseprofil Swisss 68, the springs 66 and the securing element 62 may for example be in or on the base body 30 before placing the first cover member 22.
  • the positive engagement can then be made by pressing the cap member 29 and the cam profile piece 68 against the spring force of the springs 66 and pushing the securing member 62 into the locking position after fitting the first cover member 22.
  • a pre-assembly of the same on the first cover member 22 in the manner of arranging the Mit Converseprofil Swisss 68 on the underside of the first cover member 22, inserting the cover part of the cap member 29 from the top of the first cover member 22 forth in the opening 28, and establishing the positive connection by means of Fuse element 62 may be provided with subsequent insertion of the so pre-assembled parts in the main body 30.
  • the cap member 29 forms a Notlaufkappe so far and provides a Notlauffunktion for the liquid pump ready, as in the unlocked state or in the release position of the pump rotor decoupled from the transmission and drive motor remains rotatable.
  • the main body 30 is formed symmetrically, i. H. its mounting position with respect to the first and the second cover element 22, 24 is exchangeable. Because of these symmetry properties, therefore, analogous and functionally identical to the first cover element 22, the second cover element 24 serving as the bottom also has the positively engaging securing element 62 and sleeve arrangements for fixing the second cover element 24 to the main body 30.
  • the previously known from the prior art rocker assembly with tilt bearing is replaced by a linear guide, without additional bearings gets along.
  • the spring 45 is disposed directly behind the pressure body 42.
  • the linear guide of the pressure element 40 takes place in the direction of the occlusion force.
  • An angle ( Fig. 7 ) of the linear guide is determined by the determination of the direction of force and the force magnitude for occlusion of the waveguide 80 and is preferably in the range of 35 ° to 55 °, and optimally 42 °.
  • Fig. 7 shows a force diagram for explaining forces at the occlusion site.
  • F c the spring force of the spring 45
  • F cw is the effective spring force on a lever
  • Fo is perpendicular the occlusion force
  • F p the opening force for the release of the occlusion due to the media pressure in the waveguide 80, and the hose elasticity.
  • the direction of force of the spring (guide direction of the pressure element 40) points at an angle of 90 ° - ⁇ , ie in a range of 35 ° to 55 ° and optimally 42 °, angled against the force direction of the occlusion of the waveguide 80th
  • a liquid pump 100 operating on the principle of an occlusive peristaltic pump includes a pump rotor 20 rotatable in the liquid pump, comprising a base body 30, a first cover element 22 fixed to the base on the upper side, and a second cover element fixed to the base body on the underside 24, and at least one received in the body pressure element 40 with a pressure body 42 for occlusion of a liquid-carrying waveguide section against a circular shaped running surface 60 on a housing portion of the liquid pump 100.
  • the at least one pressure element 40 by the first cover member 22 and the second cover member 24 in Effective direction of a occlusion force guided linear.
  • the liquid pump may be a peristaltic pump of a dialysis machine, with a linear guide of the pressure element 40 and pressure body 42.
  • the force direction of the spring 45 shows angled against the direction of force of the occlusion of the tube.
  • the roller-shaped pressure body 42 is mounted on the outer body 30 via the pressure element 40, the pressure body being mounted on the base body 30 via a bayonet closure.
  • the pressure element can be in two parts (element body and cover part) or in three parts (Element body and two lid parts) and by means of cylindrical pin (s) be joined together.
  • the spring 45 is mounted behind the pressure element 40 and secured by the cylindrical pin 46.
  • the linear guide can be used to compensate for a draft angle, d. H. a necessary slope of surfaces to the formation of the tool after the plastic injection molding, beveled. A resulting by such bevels additional force component can be absorbed by appropriate storage in the transmission.
  • this can be designed either as a profile (eg as a dovetail).
  • the system of the pressure element on the lid and bottom can not be straight, but obliquely designed to reduce the duration of rubbing and thus the wear and jamming.
  • this friction-optimal material pairings are used, which do not favor jamming.
  • a mating of PBT with PBT may be provided, or a mating of PBT with PI + graphite + PTFE may be used as an insert in the guide.
  • the tread 60 may be for easier and better cutting of a bottom part be separated, whereby endgeometrienahes raw material is usable.
  • a bottom plate for the tread having housing part or the rear side may also be formed simultaneously as a cover of a transmission. Housing parts are passable via conical pins and / or fixable by screws, resulting in a smaller number of geometric tolerances with respect to the tolerance of the occlusion site results and whereby larger tolerances can be compensated.
  • the tread with the bottom plate can be designed as injection molding, wherein the compensation of the Ausformschräge can be represented by the pump rotor 20 or the Ausformschräge is removed by rework.
  • a base plate for the running surface having housing part or the rear side may also be formed simultaneously as a cover of a transmission.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP18158138.0A 2017-02-24 2018-02-22 Pompe à liquide Active EP3366923B1 (fr)

Applications Claiming Priority (1)

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DE102017103857.4A DE102017103857A1 (de) 2017-02-24 2017-02-24 Flüssigkeitspumpe

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EP3366923A1 true EP3366923A1 (fr) 2018-08-29
EP3366923B1 EP3366923B1 (fr) 2020-07-01

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DE102016114959A1 (de) * 2016-08-11 2018-02-15 B. Braun Avitum Ag Peristaltikpumpe mit rotatorischem Spiel
US11565256B2 (en) * 2019-06-28 2023-01-31 Vanderbilt University Microfluidic systems, pumps, valves, fluidic chips thereof, and applications of same

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JPH07217541A (ja) * 1994-02-01 1995-08-15 Fumito Komatsu チューブポンプ
US20020173755A1 (en) * 2001-04-13 2002-11-21 Christenson Steven R. Implantable drug delivery device with peristaltic pump having a bobbin roller assembly

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IL55980A (en) 1977-12-02 1982-04-30 Baxter Travenol Lab Flow metering apparatus for a fluid infusion system
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DE8111484U1 (de) 1981-04-16 1981-11-26 Dr. Strackharn Medizintechnik KG, 8523 Baiersdorf Schlauchpumpe fuer medizinische zwecke
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DE102010033241A1 (de) * 2010-08-03 2012-02-09 Fresenius Medical Care Deutschland Gmbh Vorrichtung mit einer Schlauchrollenpumpe sowie Verfahren hierzu
EP2781234A1 (fr) * 2013-03-20 2014-09-24 Fresenius Medical Care Deutschland GmbH Tube pour circuit extracorporel avec double connecteur
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Publication number Priority date Publication date Assignee Title
US3644068A (en) * 1970-03-12 1972-02-22 Kenneth Leeds Pump arrangement
DE8429975U1 (de) * 1983-10-12 1985-02-21 Unilever N.V., Rotterdam Peristaltische pumpe
JPH07217541A (ja) * 1994-02-01 1995-08-15 Fumito Komatsu チューブポンプ
US20020173755A1 (en) * 2001-04-13 2002-11-21 Christenson Steven R. Implantable drug delivery device with peristaltic pump having a bobbin roller assembly

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EP3366923B1 (fr) 2020-07-01
US10982666B2 (en) 2021-04-20
US20180245578A1 (en) 2018-08-30
DE102017103857A1 (de) 2018-08-30

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