Classifications

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

Definitions

• a peristaltic pump consists of a frame on which is fixed a motor whose axis drives in rotation a cage comprising a plurality of rollers.
• the rollers are in contact with a deformable tube which they crush until tightness.
• the angular displacement of the sealing point causes, behind the crushed area, a depression in the tube immediately filling with fluid.
• the quantity of fluid trapped in the deformable tube between two rollers is then drawn towards the outlet of the pump.
• a large majority of peristaltic pumps have a casing with an internal cylindrical face, called a bearing surface, against which the tube is crushed by the rollers to guarantee the tightness of the tube.
• the envelope swept by the trajectories of the outer faces of the rollers is called the raceway.
• the main element of a peristaltic pump is its pump body tube generally made of an elastomeric material.
• the pump body tubes are produced by extrusion. The physical and dimensional characteristics of the tubes given by the manufacturer are only average values.
• the measured values of a particular characteristic fluctuate statistically, for example according to a Gaussian law, around the corresponding average value.
• the manufacturer of the deformable tube defines a tolerance interval around the mean value in which the probability of finding the measured value of the characteristic is high.
• the measured thickness of a deformable tube at the place where it is deformed fluctuates around the average value. It is therefore probable that the portion of deformable tube crushed by the rollers has walls the cumulative thickness of which is less than or greater than the nominal sealing dimension provided by the pump manufacturer.
• the tightness of the pump body tube characterized by the sealing rib, consists first of bringing the two walls of the tube into contact and then applying an appropriate tightening depending on the thickness of the tube, its hardness of temperature etc.
• the wall undergoes wear, swelling, loss of thickness, modification of the physical nature of the material making up the tube, etc.
• This wear in the broad sense may be due to the repeated mechanical action of the rollers on the outer surface of the tube, to the chemical action of the liquids transported in the tube on the inner surface of the tube, or even to the conditions for example of temperature in which the peristaltic pump is used. Consequently, the cumulative thickness of the walls of the deformable tube tends to vary over time. There comes a point when the cumulative thickness of the walls becomes less than or greater than the nominal sealing dimension.
• the curvature of the flexible band is constrained by tangential adjustment rods connected to the ends of the flexible band and radial adjustment rods connected to a central portion of the flexible band.
• the adjusting rods By screwing the adjusting rods more or less, the user gives the flexible strip an optimal shape.
• r is the internal radius of the tube and D a parameter corresponds to the degree of crushing of the tube varying between 0 and 1).
• D a parameter corresponds to the degree of crushing of the tube varying between 0 and 1).
• the insertion of the deformable tube between the flexible strip and the rollers is not described.
• the thickness and the radius of the deformable tube appear as parameters, the use of deformable tubes having variable characteristics is not mentioned. No particular information on the variation of the parameter D along the input and output sections is given to define the optimal profile.
• the adjustment of the curvature of the flexible strip carried out during the operation of the pump is carried out manually by the user.
• Patent SU 794,243 of January 7, 1981 describes a peristaltic pump, the tube support of which is wound so as to form a propeller pitch around a roller mounted on an axis offset from the axis of the propeller.
• the deformable tube is placed between the roller and the tube support.
• the tube support consists of a metal blade having a certain elasticity, the ends of which are connected by an adjustment stud. When the user turns the dowel, the two ends of the blade move apart or approach each other. In Consequently, the radius of the propeller is modified to change the distance between the tube support and the roller to modify the occlusion of the deformable tube allowing the thickness of the tube to be caught.
• the tube support is connected to the frame by a series of bolts, annularly distributed regularly, engaged respectively in guide grooves.
• the guide grooves the shape of which is not explained, indirectly make it possible to constrain the movement of the tube support so that it retains a constant radius of curvature over its entire length. Once the adjustment has been made by the user, the bolts are tightened, which prevents any modification of the radius while the pump is operating.
• US Patent 5,549,461 issued August 27, 1996 discloses a peristaltic pump having an occlusion ring connected to a hinged support by means of a series of threaded bolts.
• the hinged support As the rollers rotate, the hinged support is lowered so that the deformable tube is crushed against the occlusion ring, thereby obstructing pumping. In the lowered position, the hinged support is held to the frame i by a closure system possibly making it possible to avoid overpressures.
• the radius of the occlusion ring which is concentric with the axis of rotation of the rollers, can be adjusted by the user by means of a series of screws to allow the use of the pump with deformable tubes having different thicknesses.
• the peristaltic pump described is not intended for fine laboratory or medical applications. The curvature of the ring and how to obtain it by tightening the bolts are not described.
• the invention aims to provide another technical solution to the problems posed above and to overcome the aforementioned drawbacks.
• a peristaltic pump intended to operate with a flexible and deformable pump body tube, comprising a housing, a bearing surface forming with the housing a housing, and a plurality of cylindrical rollers housed inside the casing, the rollers being capable of being rotated about a main axis and of crushing the tube at at least one point on one face of the bearing surface, oriented towards the inside of the casing, called the internal face, characterized in that the bearing surface comprises a deformable intermediate portion having an intermediate internal face having a cylindrical shape whose axis coincides with the main axis, and first and second rigid lateral arms arranged on either side of the deformable intermediate portion, of the first and second free ends of the first and second rigid lateral arms respectively comprising first and second guide means, and in that the housing includes upstream tracks and downstream on which the first and second guide means are capable of sliding, the upstream and downstream tracks
• the bearing is removable to allow the positioning of a pump body tube between at least one roller of the plurality of rollers and the intermediate inner face of the deformable intermediate section of the bearing.
• the scope is placed on the housing of the peristaltic pump when the peristaltic pump is put into service.
• the bearing surface is placed on the housing by snap-fastening of the first and second guide means on the upstream and downstream tracks.
• the housing is formed by the union of an interior part and an exterior part, the bearing being joined to the external part so as to optionally form with a pump body tube an interchangeable sub-assembly, the sub-assembly interchangeable assembly being placed on the inner part of the housing when the peristaltic pump is put into service.
• the peristaltic pump is symmetrical with respect to a main plane of symmetry defined by the main axis and the bisector of the opening angle of the intermediate inner face.
• the variation of the radius of the intermediate inner face with respect to the non-constrained radius of the intermediate inner face is in a ratio of 10% at most.
• the plurality of rollers is composed of three rollers and the intermediate inner face has an opening angle of at least 120 ° so that at least one of the three rollers is at all times vis-à-vis the intermediate inner face, the tube being crushed at at least one point.
• the length of the first and second lateral arms is between 0.9 and 1.2 times the value of the unconstrained radius (R) of the intermediate inner face.
• the predefined layout of the upstream and downstream tracks can be likened to first and second straight segments lying in a plane perpendicular to the main axis, the segments respectively making an angle of about 45 ° with the main plane.
• the predefined layout of the upstream and downstream tracks is comparable to arcs of a circle whose center lies in a plane perpendicular to the main axis.
• the first and second guide means are constituted by first and second bosses situated laterally on the respective free ends of each of the first and second lateral arms, and capable of sliding respectively along the upstream and downstream tracks.
• the upstream and downstream tracks are constituted by chamfered lateral faces of first and second main walls of the housing.
• the upstream and downstream tracks consist of lateral faces of recesses made in the first and second main walls of the housing.
• the upstream and downstream tracks are notched.
• the bearing comprises secondary guide means placed at the apex of the deformable intermediate portion and projecting laterally on either side of the latter
• the housing comprises first and second grooves made along the main plane of symmetry in first and second main walls of the housing, the grooves being intended to cooperate with the secondary guide means to maintain the range symmetrically with respect to the main plane of symmetry during operation of the peristaltic pump.
• the pump comprises storage means making it possible to maintain the range on the housing so that the pump body tube is not constrained during storage of the pump, the storage means allowing the scope to be positioned correctly. when using the pump.
• the housing has fixed upstream and downstream counter-bearings placed respectively opposite the first and second inner faces of the first and second lateral arms to maintain the fixed tube relative to the range when using the peristaltic pump.
• the pump comprises a removable pre-assembled sub-assembly consisting at least of a bearing surface and a tube.
• the invention also relates to a pre-assembled sub-assembly consisting of at least one bearing surface and a tube for a peristaltic pump according to one of the pumps described above.
• the sub-assembly also comprises an external part of the housing, the external part carrying tracks.
• the invention also relates to a pre-assembled sub-assembly consisting of a bearing surface and a tube for a peristaltic pump according to what is described above.
• FIG. 1 is an exploded perspective view of the preferred embodiment of the peristaltic pump according to the invention
• Figure 2 is a front view of the peristaltic pump of Figure 1, one of the half-housings being removed for reasons of clarity
• Figure 3 is a section along the plane III-III, said main plane of symmetry P, of the peristaltic pump of Figure 2
• Figure 4 is a schematic representation of the forces acting on the movable surface of the peristaltic pump of Figure 1
• Figure 5 is a set of curves representing different profiles of the movable range of the peristaltic pump of Figure 1
• Figure 6 is a perspective view of another embodiment of the peristaltic pump according to the invention
• Figure 7 is a front view of yet another embodiment of the peristaltic pump according to the invention.
• the peristaltic pump 100 comprises a housing 200, a drive device 300, a movable bearing 400 and a deformable pump body tube 500 (shown in phantom in Figure 2).
• the housing 200 is composed of a first half-housing 201 and a second half-housing 202.
• the first and second half-housings are strictly identical. If they are made of plastic, as in the presently preferred embodiment, each of the two half-housings can be molded using a single mold.
• the first half-housing 201 will now be described in detail.
• the first half-housing 201 has a first main wall 203. In the assembled position of the first and second half-housings 201 and 202 one on the other, the face of the first main wall 203 placed facing the second half-housing 202 is called "first interior face" 205 a. The face of the first main wall 203 opposite the first inner face 205a is called “first outer face” 205b.
• the first main wall 203 generally has the shape of an isosceles triangle.
• the base of this triangle is placed “horizontally”, and the height from the base is placed “vertically”.
• the qualifiers "horizontal” and “vertical” are arbitrary and do not presuppose a particular orientation of the peristaltic pump, but simply allow to give an orientation relative to the elements which they qualify.
• the plane perpendicular to the base and containing the height will be called “main plane of symmetry” and will be noted P throughout this document.
• the first main wall 203 On the side of the first inner face 205a, the first main wall 203 has a bore 207 whose axis A, horizontal in FIG. 2, rests in the main plane of symmetry P.
• the bore 207 has a shoulder 209.
• the bottom of the bore 207 is provided with a hole 211 passing through the first main wall 203 and able to receive without friction the drive shaft 301 as will be described below.
• the first inner face 205a has a reinforcement wall 213 projecting perpendicularly from said main wall 203.
• the reinforcement wall 213 has a height H (FIG. 3).
• the reinforcement wall 213 has a complex shape symmetrical with respect to the main plane of symmetry P.
• the reinforcement wall 213 has a central portion 213a in an arc of a circle with axis A, a first clearance portion upstream 213e and a first portion of upstream counter-reach 213f on the intake side (left side in FIG.
• the support wall 213 is provided, on the discharge side, with a female positioning means 215 and, on the intake side, a male positioning means 217.
• the main wall 203 is chamfered. The identical angles of the isosceles triangle formed by the main wall 203 (the angles formed at the base thereof) are cut.
• the main wall 203 has at its periphery a first upstream side face 221 and a first downstream side face 223. It should be noted that the first upstream and downstream side faces 221 and 223 generally form an angle of 135 ° with the base of the main wall 203.
• the second half-casing 202 identical to the first half-casing 201 undergoes a rotation of 180 ° and is positioned opposite the first half-casing 201.
• the first male positioning means 217 is housed inside the second female positioning means 216 and the first female positioning means 215 receives the second male positioning means 218.
• the second half-housing 202 is correctly positioned laterally relative to the first half-housing 201
• the two half-housings are brought together until the first reinforcing wall 213 comes into contact over its entire section with the second reinforcing wall 214.
• the first and second main walls 205 and 206 are both parallel and maintained at a predefined distance from each other being worth 2 H.
• the two half-housings 201 and 202 are maintained in this correct position of assembly by gluing, by screwing or by any other otherwise known means.
• the first bore 207 and the second bore 208 form the casing of the peristaltic pump 100.
• the first and second upstream side faces 221 and 222 form a guide surface or track upstream 251
• the first and second downstream side faces 223 and 224 form a guide surface or downstream track 252.
• the drive device 300 comprises a separator
• the separator 305 is provided with a plurality of rods annularly distributed in a regular manner, mounted perpendicular to the plane of the separator. Each of the rods of the plurality of rods carries a free rotating cylindrical roller.
• the separator 305 comprises three rods 311, 312 and 313 and three rollers 321, 322, 323. Consequently, each roller is spaced angularly from its neighbor by 120 °.
• the separator 305 is housed without friction, and is therefore free to rotate at the bottom of the first bore 207 beyond the first shoulder 209.
• the height h of a cylindrical roller is such that a first end of the roller comes to be positioned inside the first shoulder 209 and that the second end of the roller comes to be positioned inside the second shoulder 210 (FIG. 3). If l corresponds to the depth of the shoulders 209 and 210, the following relationship exists: 2H ⁇ h ⁇ 2H + 21
• the frame of the peristaltic pump 100 thus formed is mounted on the motor shaft 301 of a motor, for example an electric motor (not shown) capable of rotating said rollers 321, 322, 323.
• the motor shaft 301 is passed through the first hole 211, and the hole 306 of the separator 305.
• the motor shaft 301 is then force-fitted between the plurality pebbles. The latter are then applied against the first and second axial faces 209a and 210a of the first and second shoulders 209 and 210.
• the drive shaft 301 is passed through the second hole 212 of the second wall 204 of the second half-housing 202
• the rotational movement of the motor shaft is transmitted to the rollers.
• the first and second axial faces 209a and 210a respectively define first and second raceways of radius r.
• the movable surface 400 includes an intermediate portion 401 and first and second lateral arms 403 and 404 respectively disposed on either side of the intermediate portion 401.
• the movable range 400 is symmetrical with respect to a plane of symmetry which, in the assembled position of the movable bearing on the frame of the peristaltic pump, corresponds to the main plane of symmetry P.
• the intermediate portion 401 has a shape corresponding to a portion of ring of axis A 'and of rectangular section.
• the ring portion extends angularly on either side of the main plane of symmetry P over a half-opening arc at the apex ⁇ , the apex or apex corresponding to point B.
• the intermediate inner face 405 of the intermediate portion 401 is the radially internal axial face of the ring.
• the first and second lateral arms 403 and 404 are rectilinear. Alternatively, and for ergonomic problems and space available in certain applications, the lateral arms may have other shapes: bent, with an angle of rectangular section.
• the face of the first lateral arm 403 tangentially connecting to the intermediate inner face 405 of the intermediate portion will be called the first inner face 407 of the first lateral arm 403.
• the second lateral arm 404 has a second inner face 408 tangentially connecting with the intermediate inner face 405.
• the 404 respectively comprise at their free end, opposite the end connected to the intermediate portion 401, gripping means, means for holding the tube and guide means.
• the gripping means 409 are formed integrally with the lateral arms, by bending towards the outside of the movable seat 400 the end portion of the corresponding lateral arm.
• the first and second lateral arms 403 and 404 respectively have a bend at the point E and F.
• the tube holding means consist of a piece 411 (412) in the shape of an arch, the central part of which is connected to the inner face 407 (408), in the width thereof, at the point E (F).
• the first guide means 413 are, in the currently preferred embodiment, constituted by first edges 413a and 413b.
• the width of the gripping means 409 is greater than the width of the first lateral arm 403 so as to form front and rear bearings on either side of the latter.
• These front and rear bearings respectively have two bosses, the junction of which forms a first front edge 413a and a first rear edge 413b.
• the first front edge is an extension of the first rear edge.
• the second lateral arm 404 comprises second guide means 414, the latter being constituted by second front and rear edges 414a and 414b.
• the movable surface 400 has a certain flexibility in the intermediate portion 401.
• the first and second lateral arms 403 and 404 are rigid.
• the mobile bearing is in this embodiment made in one piece by molding a plastic material. It is therefore necessary for the thickness of the intermediate portion 401 to be less than the thickness of the first and second lateral arms 403 and 404.
• the intermediate interior face 405 is tangentially connected to the first and second interior faces of the lateral arms, and no discontinuity of the inner face of the movable surface 400 is present, the variation in thickness between the intermediate portion 401 and each of the first and second lateral arms 403 and 404 is caught up on the outer face of the movable range 400 at the end points C and D of the intermediate portion 401.
• the movable surface is made of metal.
• a pump body tube 500 is positioned against the inner face of the movable bearing surface 400. More particularly, the tube is incised so as to be slightly pinched, upstream between the legs 411a and 41 lb of the first arch 411 and downstream between the legs 412a and 412b of the second arch 412. No longitudinal constraint is applied to the tube if it is correctly positioned along the movable span.
• the movable bearing surface 400, on which the tube 500 is disposed, is then placed in position on the frame of the peristaltic pump by clipping.
• the user moves the first and second gripping means 409 and 410 apart from one another so as to deform the movable surface 400 at its intermediate portion 401, until the guide means 413 and 414 pass the widest section of the housing 200 corresponding to the end portions of each of the upstream and downstream tracks 251 and 252. After crossing, the user releases the gripping means.
• the movable range 400 then places itself correctly on the frame by the play of forces as will be described below. In the correct assembly position, the axis A ′ of the intermediate portion 405 in the form of a ring coincides with the axis A around which the rollers rotate.
• the movable range 400 is also placed symmetrically on either side of the main plane of symmetry P. The correct positioning of the movable range 400 is done automatically. No particular adjustment is requested from the user.
• the intermediate portion 405 is housed between the first and second main walls 203 and 204 of the two half-housings 201 and 202.
• the width of the movable surface L is consequently slightly less than 2 H.
• the deformable tube 500 is located axially between the two raceways 209a and 210a and radially between the inner face of the movable seat 400 and at least one of the rollers 321, 322 or 323. Consequently, for qu '' at any time at least one of the rollers crushes the deformable tube, it is necessary that the opening angle 2 ⁇ of the intermediate portion 401 is greater than the angle between two successive rollers.
• the opening angle 2 ⁇ must be greater than 120 °, and this regardless of the opening of the movable range.
• R r + 2 ⁇ e, where R is the radius of the intermediate inner face 405 of the intermediate portion 401; r is the radius of the raceways 209a and 210a which is a geometric constant of the peristaltic pump 100; e is the thickness of the deformable tube 500 and ⁇ a dimensionless parameter less than one, indicating the crushing of the two walls of the tube one on the other to reach the nominal sealing dimension.
• the deformable tube 500 is slightly compressed between the first inner face 407 and an upstream counter-bearing placed opposite which consists of the first upstream counter-bearing portion 213f of the first reinforcement wall 213 and of the second upstream counter-bearing portion 214b of the second reinforcement wall 214.
• the deformable tube 500 is slightly compressed between the second inner face 408 and a downstream counter-bearing placed opposite which consists of the first downstream counter-bearing portion 213b of the first reinforcing wall 213 and of the second downstream counter-bearing portion 214f of the second wall of reinforcement 214.
• the amplitude of the crushing force F is low when it comes to deforming the tube 500 by bringing its walls one towards the other, then undergoes a discontinuity and quickly grows once the two walls are brought into contact with each other. If, for example, the tube 500 is already at its sealing rib, but at a distance too close to the axis of rotation A, the roller will apply a crushing force F that is too great. We will show in what follows that the mobile bearing 400 will move so as to move the tube 500 away from the axis of rotation A. The crushed tube 500 transmits the crushing force F to the mobile bearing 400 at the point contact, here the apex B.
• the movable bearing surface 400 is retained at the free ends of the lateral arms by the first and second edges 413 and 414 in contact with the upstream and downstream tracks 251 and 252. Consequently, the force of the tube on the movable bearing is transmitted by the bearing to the point of contact of the bearing with the housing.
• a force Fj corresponding to half of the force F is applied by the first edge on the upstream track 251, and a force F 2 corresponding to half of the force F is applied by the second edge on the downstream track 252.
• the force Fi breaks down into a force F ⁇ N perpendicular and a force F ⁇ T tangential to the upstream track 251. Assuming that the coefficient of friction, the reaction of the upstream track on the first edge is perpendicular to the upstream track.
• the reaction of the upstream track only compensates for the force F 1N .
• the reaction of the downstream track on the second edge only compensates for the perpendicular component F 2N - Consequently, the first and second free ends of the first and second lateral arms are respectively subjected to resulting forces corresponding to the components F 1T and F 2 ⁇ of Fi and F 2 .
• the components F ⁇ T and F 2 ⁇ have a contribution along the plane of symmetry P tending to move the movable range 400 upwards.
• the components F ÎT and F 2 ⁇ also have contributions perpendicular to the plane of symmetry P and in opposite directions tending to spread the first and second free ends of the first and second lateral arms.
• the shape of the movable surface 400 is studied so that this spacing of the first and second free ends causes only a deformation of the intermediate portion 401 of the mobile range 400.
• This deformation combined with the upward movement of the mobile range 400, results in an increase ⁇ R of the value of the radius R of the intermediate internal face 405 but without modification of the position of the center of curvature of the intermediate inner face 405, the axis A ′ of the intermediate inner face 405 permanently coinciding with the axis A of rotation of the rollers.
• the range against which the tube 500 is crushed automatically increases its radius.
• This movement of the seat allows the tube to find a position a little further from the rollers corresponding to its nominal sealing rib.
• Reach 400 works like a leaf spring.
• the pump parts are made of polyurethane.
• the pump has a radius r of approximately 18 mm.
• the unconstrained radius R of the span is 19 mm.
• the rigid lateral arms have a length L of 40 mm corresponding to 2 R.
• the deformations of the profile of the movable surface are shown in FIG. 5.
• the variation in radius ⁇ R is approximately 10% of the value of radius R, which leads at a maximum radius of 21 mm.
• the opening angle of the latter increases from approximately 66 ° to 60 °.
• the thickness of the movable surface at the intermediate portion is 3 mm, while the thickness of the mobile range at the first and second lateral arms is 5 mm.
• the force applied by the tube to the movable surface is a radial force M having a component M PT in the main plane of symmetry P having the effects described above, but also a component M PP perpendicular to said main plane of symmetry P having the effect of pushing the movable bearing surface 400 out of the main plane of symmetry.
• This additional metal clip has an axis parallel to the axis A. L additional clip projects on either side of the movable bearing surface 400 and engages in first and second grooves 251 and 252 (FIG.
• first and second main walls 203 and 204 respectively formed in the first and second main walls 203 and 204 on the side of the interior faces 205a and 206a of the latter.
• the first and second grooves lie in the main plane of symmetry P. Consequently, the movable bearing surface 400 is prevented from leaving the main plane of symmetry P, the perpendicular component M PP being compensated by the reaction of the additional clip against the edges lateral of each of the first and second grooves 251 and 252. It also seems that the fact that the movable surface 400 slightly out of the main plane of symmetry P has a smoothing effect on the pressure fluctuations constituting a conventional phenomenon known as peristaltic pumps .
• a preassembled composed of a scope and a tube.
• the tube is for example already clamped between the first and second fastening means and positioned against the inner face of the movable surface.
• the elastomer tube is glued at different points along the inside of the movable surface.
• the pre-assembled thus formed is then packaged in a sterile bag. On the latter are indicated the characteristics of the tube and the type of frame on which the movable surface can be clipped. The user simply has to unpack the pre-assembled and clip it onto the corresponding frame.
• the immediate advantage is to allow the reuse, from one application to another, both of the electric motor and of the motor shaft 301, as in the prior art, but also of the whole of the frame composed of the housing 200 and drive device 300.
• the consumable having a reduced number of parts is less expensive. It is easily positioned, adjusts automatically and helps to avoid adjustment errors.
• the peristaltic pump according to the invention can be used with various types of tubes.
• the variation in the thickness of the walls of the tube having various origins (manufacture, wear, different types of tube etc.) is automatically compensated for by adjusting the radius of the intermediate inner face of the movable seat.
• FIG. 6 represents another embodiment of the invention.
• the housing consists of two parts: an interior part (not shown) forming a housing for receiving the rollers; and an outer part 260 carrying the guide tracks.
• the interior and exterior parts 260 form a housing similar to the housing 200 described in the currently preferred embodiment illustrated in FIGS. 1 to 5.
• Two sub-assemblies can thus be distinguished: on the one hand, a sub-assembly fixed optionally comprising the motor, the separator 305, the rollers 321, 322 and 323 and the inner part of the housing; on the other hand an interchangeable sub-assembly comprising a tube 500, a movable surface 400 and the outer part 260 of the housing (and therefore the guide tracks).
• the interchangeable sub-assembly can for example be connected to a bottle containing a liquid to be pumped.
• the user brings together the fixed and interchangeable subassemblies together to form a peristaltic pump with its volume of liquid to be pumped.
• the movable bearing surface 400 consists of a metal blade comprising an intermediate portion in an arc of a circle and rectilinear and rigid upstream and downstream lateral arms positioned on either side of the intermediate portion.
• the thickness of the movable surface 400 is small.
• the guide means are upstream bosses 473 a and 473b and downstream bosses 474a and 474b constituted by tongues cut from the mass of the metal strip when the latter is cut.
• the peristaltic pump consists in that the upstream and downstream guide tracks 251 and 252 are not positioned on the upstream side faces 221 and 222 and downstream 223 and 224 of the housing, but on the side faces of recesses practiced in the main walls of the housing. More particularly, the first main wall 263 of the external part 260 comprises a first upstream recess 265 and a first downstream recess 266. Similarly, the second main wall 264 of the external part 260 comprises a second upstream recess 266 and a second recess downstream 268.
• the movable range 400 is associated with the outer part 260 of the housing so as to unite the parts constituting the interchangeable sub-assembly.
• the movable bearing is housed in the outer part 260, that is to say the bosses 473a, b and 474 a, b are housed in the corresponding recesses 265-278, when the main walls 264 and 263 of the external part 260.
• the guide tracks are arcs of a circle whose center is located in the main plane P. This particular layout of the tracks is the result of the particular geometric characteristics of this embodiment of the peristaltic pump (length of the lever arms of the lateral arms, range of tubes that can be used in this pump, etc.), the greatest precision in producing the tracks by molding, and the use of a metal movable surface of great precision Manufacturing.
• Figure 7 shows yet another embodiment of the invention.
• the first and second upstream and downstream lateral faces are no longer smooth surfaces, but have a plurality of 280 millimeter notches.
• the shape of each notch 280 is asymmetrical.
• a notch consists of a short face 281, oriented in the direction of the main plane of symmetry P, making a significant angle with the tangent of the layout of the runway 251 or 252, and a long face 282, oriented away from the plane of main symmetry P, making a slight angle with the tangent to the course of track 251 or 252.
• the bosses 473 a, b and 474a, b of the movable range 400 cannot move along the track 251 and of track 252 only in the direction of tightening of the tube 500, that is to say towards the main plane of symmetry P.
• This direction is preferred because it corresponds to the normal evolution of a tube during its use, under the effect of wear and loss of elasticity of the tube wall.
• this arrangement allows the peristaltic pump to withstand high operating pressures without modifying the radius of curvature, the bosses bearing on the short faces 281 of the notches 280.
• the groove 251 for guiding the clip located at the apex of the movable range 400 is shown. It has a wedge 290.
• the wedge 290 allows, in the storage position of the peristaltic pump, to keep the movable range 400 away from the rollers 321- 323 so that the pump body tube 500 is not crushed or constrained during this storage period.
• the wedge 290 is of generally parallelepiped shape and is capable of being inserted in the groove 251.
• the face 291 of the wedge 290 bearing on the roller 323 located in the " main plane P is circular. It has a radius of curvature equal to that of the outer face of the roller 323.
• the clip located at the apex of the movable surface comes to bear on a face 292 of the wedge 290 opposite to the cylindrical face 291.
• the drive motor forces to apply additional torque so that the roller 323 disengages from the wedge 290 and can roll along the raceway 209.
• the wedge 290 is then pushed upwards and raises the movable range 400 Then, once the roller 323 is disengaged from the wedge 290, the latter falls behind the roller 323 in the interval between two successive rollers.
• the movable bearing 400 which is then no longer supported by the wedge 290 slides along the groove 251 and has just automatically placed in its correct operating position.

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• 2004
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  • 2004-09-07 WO PCT/FR2004/002264 patent/WO2005026550A2/fr active Application Filing
  • 2004-09-07 AT AT04787319T patent/ATE454554T1/de not_active IP Right Cessation
  • 2004-09-07 CN CN2004800316494A patent/CN101415946B/zh not_active Expired - Fee Related
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  • 2004-09-07 JP JP2006525169A patent/JP2007509267A/ja not_active Ceased
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