DE1653397A1 - Process and device for conveying liquids in thin hoses - Google Patents

Description

- "Method and device for pumping liquids in thin tubes "

In laboratory technology there is often the need to in one or more tubes, if necessary also in thin tubes Hoses, which are generally small in cross-section, are used to convey liquids The rule is that the proportionality of the flow in the individual tubes is ensured * In principle, there are two types so-called peristaltic pumps known and in use for these purposes.

In one way, two or more small cylinders or small rollers, which move in a forced movement on a circular path, press the thin hose or several adjacent hoses against the inner or outer circular surface of the base body on which the thin hose rests and is fastened.

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are fixed around the axis of the impression part of the cylindrical Surface of the base body rotates centrally, form between the The circumference and the surface of the pressure body have a space dimensioned so that the inner profile of the elastic thin Hose at the point of pressure due to its influence so is deformed that the inner surfaces of the thin tube tight lie against each other and so the inner space of the thin; Hose divide up close to the Andrucksteiie and after it. This departmental Pressure and compression of the thin tube when rolling P the roll on the hose lasts until the further him subsequent role exerts a new pressure in such a way that the first pressure can stop without it even happening for a moment the continuity along the entire length of the elastic hose is free * Because the elastic, thin Hose compressed at least at one point to the point of impermeability is, it is ensured that the liquid inside the thin tube is proportional to the rolling speed the role is pushed further in the specified manner "

t The second type of pump is similar to the one just mentioned except for

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the fact that there are several roles in similar form on one! - Move the hose or a larger number of adjacent ones lying on an even plate, where d && movement; of the rollers in the functional saws, in which the peristaltic pressure on the tubes takes place, is secured by the fact that the above-mentioned rollers are moved, for example, by two Galian chains, each of which forms a closed, flat loop, on the two upper ones Ends of the two chains are stored in cogwheels * one pair of which is driven «

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In both cases, the necessary condition for closing the individual thin tubes is that the peristaltic must be removed acting roles of the immovable surface / on the one or more hoses are supported, one of which is that in the case of peristaltic deformation, the inner profile with a Sufficient reserve is completed without the undue stress arise, which lead to an all too rapid destruction of the hoses due to fatigue if these excessive deformations be subjected. In "some cases, especially where it is If one or only a few hoses are involved, there is the possibility that the pressure rollers are resilient with adequate pressure create the hose or, on the contrary, that against the inelastic rollers, the fixed wall rests elastically so that a adequate deformation of the hose is achieved. A significant one Deficiency, however, lies in the fact that the requirement must be met must that the wall thickness of all hoses are the same "

A major deficiency of the known devices described is that it is very difficult to achieve a precise regulation of the size of the flow in the hoses, "In essence Λ only a sudden change in the flow is by replacing a tube with another with another Diameter and approximately the same wall thickness are possible in order to achieve adequate deformation of the tube for its closure at the point of pressure of the peristaltic element when the tube is exchanged without changing the mutual orientation of the distance between the pressure roller and the solid.

Regulation by changing the speed of the rolling of the peristaltic element is for design reasons

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quite difficult, if not impossible. Especially with those Facilities whose advantage is that with the same Pressure element is deformed peristaltically more than one tube.

The invention is based on the disadvantages of the listed to eliminate known peristaltic conveyors.

This object is achieved according to the invention in that the flow of the liquid in one or more elastic hoses pro-P grammatically in certain, predetermined lengths by the; peristaltic effect of rolling under pressure only a single, gen roll for each hose is pushed further, this is after Completion of rolling the profile of the thin tube by applying pressure at one point with the help of a special pressure element closed for the time during the Andruci the role for the peristaltic deformation subsides and the roller is brought back to the starting position of the peristaltic movement for a new pressure will.

k As an example, FIG. 1 shows the scheme of the operation of the device according to the invention, Figures 2 to 6 are schematic examples the constructive solution of the facility.

FIG. 1 shows the schematic principle of the method of the device according to the invention. The elastic thin tube 1, - the is supported on the flat surface 3 of the support body 4, is on the point α alternately in the direction of the double arrow h compressed by the element 30 so that the clear profile of the hose and the communication in it is interrupted. Apart from the point α, the hose is alternately compressed

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with simultaneous rolling of the roller 2, the axis 6 of which describes a path that is advantageously given by the rectangle b with the change borrowed size L. The interaction of the two enclosing elements 30 and 2 is realized by the external action of the lifting mechanism, which is formed by cams, shoulders and levers and gives the elements 30 and 2 the necessary movements. This results in the thin hose being closed off by the element 30 in the first phase of the working cycle, whereupon the roller 2 lifts out of the pressure glass in the direction of the arrow c g and d moves in the direction of the arrow, d into the outlet section, where in the direction of the arrow e a new pressure is created, whereupon the pressure of the pressure element 30 is plowed and; the roller 2 in the direction; of the arrow f eiiae further pe.ris; t®lti.sGhe pumping movement.

The figure 2 sets schematically. Example of a device according to the invention dox. The elastic tube 1, for example made of silicone rubber. Jygon and similar ** is represented by the perisA / jltiseh; Acting roller 2 against the straight flat 3 of the support body: 4 pressed, 'Pie movement of the peristaltically acting roller 2 is triggered by deti lever f

mechanism. secured, its drawbar § ■ on the axle. The roller engages and is articulated at the second end with the aid of the bolt 7 to the two-armed lever β, which swings around the fixed element 9. The small roll 10 on the other; The end of the two; rmigi @ ni lever 8 engages with the cam TI, which together with other npcken; at = the shaft 12 is attached, which is due to the effect; des Antriebsmotorsj Ub ^ r not shown gear rotates, Me small role W wind? dl by the force transmitted by the spring 13 in iengriff ;, s, o that the horizontal movement of the roller 2 / by the shape of the; Nqcke

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given is. The axle 6 of one or more rollers 2 carries the other rollers 14 at its ends, which are supported on the straight surface 15 of the pressure plate 16, which with the help of the bolts 17, 18 with the arm 19, 20 * of the fixed bolts 21 , 22 is rotatable, is articulated. Here, the arm is \ 9 fixedly connected to the arm 23, which deceives the roller 24 at its end which is in permanent engagement with the other cam 25 is located on the shaft _f the 12th The further arm 26 carries at its end the further roller 27, which is in engagement with the not shown cam, which is also fastened on the shaft 12 - Connected to the indicated shape, which can compress the thin tube 1 with its end 30 so that the passage is interrupted for a certain time, which is given by the shape of a not shown, engaging in the roller 27 cam ". The continuous engagement of the rollers 24 _f 27 in the cams is provided by the elastic pressure of not shown springs.

The function of the device according to FIG. 2 is as follows. At the beginning of the cycle,? the elastic thin tube 1 is compressed by the shaped end 30 of the lever 29 and the peristaltic roller Z _t, which has not yet compressed the tube 1, is guided to compress the tube by seeing the movable support plate 16 as a result of the follow-up of the nook 25 lifts through the roller 24 and through its upper surface 15 with the aid of the roller 14 the axis 6 in the direction: pushes upwards, so that; the peristaltic roller 2 rests on the tube 1, or the paraffil of which closes by applying a sufficiently high pressure against the surface 3 of the support / epers 4

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Hose 1 with the help of the end 30 of the arm 29, whereupon the actual peristaltic movement begins when the peristaltic pressure roller 2 on the tube 1 under an adequate Pressure on the surface 3 of the body 4 by the action of the Mechanism 5, 8, the roller 10 of which follows the cam 11, rolls off. After finishing the horizontal movement of the pressed roller 2 the hose is in turn duroh the pressure of the end 30 of the arm 29 compressed, whereupon by the lowering of the pressure plate 16 the pressure of the roller 2 ceases and the lever mechanism j

Bring roll 2 back to the starting position.

The support body 4 can with advantage around the in the bearings 3S ₄ . 34 seated bolts 31, 32 are folded; the bearings are firmly connected to the base plate, not shown, in which all the fixed bolts of the mechanism are also clamped. By folding over the body 4 around the bolts 31, 32 access to the places where the hose 1 is compressed is free. The frame, not shown in FIG. 1, can also be folded around the bolts 32, 31, but only around its right-hand part, in which the incisions 36 are located, into which the hose 1 or a larger number of such hoses can be inserted, with its fastening is secured, for example, by the hook-shaped plate 37, which is fastened in the frame 35 by the adjustable screw 38. The support body 4 can advantageously be made of transparent material, for example plexiglass, whereby a direct observation of the deformation of the individual Hoses 1 under the pressure of the pressure roller 2, respectively. of the shaped end 30 of the arm 29 can be observed.

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Figure 3 shows schematically in the longitudinal section of the axis 6 the possibility of compensating for the different wall thicknesses of the individual simultaneously deformed hoses 1, I ¹ , 1 "by grading the diameter of the pressure roller 6 or by grading the height of the lower pressure surface 3 of the support body or the combination In the same figure it is further indicated that the roller 14, which is in engagement with the pressure plate 15 and advantageously in the form of a ball bearing 70 which sits on the axis 6, can be implemented Pressure roller 6 can be provided with ball bearings at the points where the individual hoses 1, I ^{1, 1 ″ are pressed.}

FIG. 4 shows schematically the detail of the device according to FIG of Figure 2 set up so that there is the possibility of the To be able to regulate the size of the peristaltic movement of the roller 6 along the tube 1. One connecting rod or several in a row arranged connecting rods 5 carry on their bolts 6 fc on the one hand the pressure roller 2, on the other hand the roller 14, the is supported on the upper surface 15 of the pressure plate 16. Every this connecting rod 5 is at its other end through the bolt connected to the upper end of the arm 40, which swings about the common axis. The can also oscillate on this axis attached oscillating plate 41, which carries the roller 10, in the manner described above, as in Figure 2 with the cam intervenes. When each arm 40 leans against the pin 42 of the plate 41, against which it is pressed by the force of the spring 43, with the spring attached to the vibrating plate 41 "

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Support 44 supports, each connecting rod and thus each roller executes a movement that corresponds to the movement of the oscillating plate 41, as if it were firmly connected to it. If, however, the upper end of the arm 40, which can optionally be provided with a limiting screw 45, hits the stop 46, which is fastened to the adjusting screw 47, then the arm remains in the associated position and continues to follow the movement of the vibrating plate 41, the spring 43 being compressed. The limiting screw is fastened by means of its thread in the nut 48, which is advantageously cut through and '

can be tightened with the screw 49. Each nut is attached to the common bracket 50, which is attached to the base plate of the entire device (not shown in FIG. 3), as is the fixed bolt 9 and the support 51 of the spring 52, which ensures the pressure required for this is that the roller 10 and thereby also the entire lever mechanism connected with it constantly follows the circumference of the neck 11. By changing the position of the individual adjusting screws 47, the length of the peristaltic movement which the rollers & 2 exert on the individual tubes can be restricted. Hereby is achieved that the conveying performance like in the individual tubes individually from a maximum to Volumleistung. can be changed to zero flow then ₀

The fact that the conveyance is here intermittently does not have to be a disadvantage compared to the in a number of cases usual peristaltic pumps, which probably deliver fairly evenly, but also with certain! fluctuations, j, e after the die individual pressure rollers - to, pressure, come to the hose or yourself remove, .pie; pulsating effect of the, procedure and; the facility

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on the contrary, according to the invention, in those cases where there is a need for very regular short interruptions, for example in the liquid flow Bladder piston or similar to push in.

5 shows schematίsch a AusFü & effect ", which makes it possible that the individual elastic tubes 1 can zusammengedrückt'werden by a resilient adjustable pressure for ^this. Purpose 29 sits the arm with its shaped end 30 on the hose" 1 not directly, but with the help of a further lever 53 which swings around the fixed bolt 54. The lever 53, with the aid of its shaped end 55, presses the thin tube 1 with a force which is determined by the tensioning of the flat spring 56 of the indicated shape, which is fastened to the lever 53 with the aid of the screw 57 and which itself is supported on the support 58, the position of which can thereby be changed, depending on the position in which the fastening screw in the cutout 60, within the limits of which the screw can be moved in the direction of the double arrow 61, is tightened.

FIG. 6 shows schematically an example of a device according to of the invention, through which it can be achieved that the pressure of the Pressure roller 2 can be regulated on the elastic tube 1, and this in terms of expressiveness, as well as in terms of the Hubs, whereby the pressure drops when the support plate 16 drops. For this purpose, the connecting rod 5 has the shape according to FIG Figure 5 and is with the help of the further bolt 62 with the rocker arm 63 connected to the shape indicated, it carries at its end the roller 14, the one with the upper surface 15 with the pressure plate is engaged «The pressure force that the roller2 on the

Hose 1 exerts, is given by the elastic force of the spring 64, which is attached to the lever 63 with the aid of the fastening _{screw 65 o} The tension of the spring 64 can be regulated by the adjusting screw 66 with the aid of the thread located in the step 67 of the lever 5. A relative movement of the
Rollers 2 and 14, within the limits of which the strength of the spring 14 acts, can be regulated by means of the adjusting screw 68, the thread of which is located in the extension 69 of the connecting rod 5.

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Claims (7)

PATENT CLAIMS: 1. Method of conveying liquids in elastic thin Hoses, characterized in that the The flow of the liquid in one or more elastic hoses is programmed at intervals, advantageously at adjustable intervals Length, pushed further by a peristaltic effect, that by rolling only one peristaltic role at a time is caused on the hose, after the completion of rolling the profile of the thin hose with the help of a further pressure element completed at one point for the time is during which the pressure of the peristaltic roller ceases and this roller into the starting point of its peristaltic Movement is returned, whereupon another pressure the role takes place. 2. Device for performing the method according to claim 1, consisting of one or more elastic hoses, which to a deformation for the interruption of the flow profile by a pressure roller or a pressure element are thereby capable g e k e η η ζ e i η et that the profile of the thin tube (1) alternately due to the pressure on the one hand of a single peristaltic roller (2), which is on the tube (l) under a Shifts pressure over a limited length between two rest positions, and on the other hand closed by a pressure element (30) will" 3. Device according to claim 2, characterized in that g e k e η η ze i c h η et, that to regulate the length (L) of the path of the peristaltic Roller (2) an adjustable stop (46) is provided. J 0 9 8 2 8/044 8 - 13 - - 13 - T653397 4. Device according to claim 2 and 3, characterized in that for pressing the peristaltic Roller (2) and / or a pressure element (30) an elastic Element is provided, 5. Device according to claim 2 to 4, characterized ge ke η η. That for the adjustability of the pressure of the peristaltic roller (2) and / or the element (30) an adjustable screw {66) is provided. 6. Device according to claim 2 to 5, characterized / that for exercising the peristaltic movement the roller (2) and / or the element (30) is provided with a cam mechanism (11, 25) which acts together with the lever mechanism. 7. Device according to claim 6, characterized in that g e k e η η ζ e i c h η et, that the cam mechanism (IT, 25), the lever mechanism (26, 29, 8, 5) and possibly also the role (2) or the element (30) are common for several delivery hoses (T). PATENT ADVOCATE BAD OHlGWAL 109828 / OA48 Empty e ι te