US 3791777 A
A novel peristaltic pump is disclosed which comprises a support base, a shaft mounted for rotation on said support base, a rotor means mounted on said shaft at one side of said support base, motor means for driving said shaft mounted on the opposite side of said support means, said rotor means having spaced around its periphery a plurality of force bearings, in a plurality of rows spaced axially along said rotor, a half jaw mounted around the periphery of said rotor means, said half jaw having a plurality of stacked-grooved sectors spaced axially along said rotor means, said plurality of stacked-grooved sectors having individual means for independent adjustment of the radial depth of each of said stacked-grooved sectors.
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Description (OCR text may contain errors)
United States Papoff et al.
Patent 1 lnventors: Paolo Papoff, Bari; Sebastiano lmpedovo, P'utignano, both of Italy Assignee: Snam Progetti S.p.A., Milanese,
, ltaly Filed: Oct. 8, 1971 Appl. No.: 187,643
Foreign Application Priority Data Oct. 8, 1970 Italy 30722/70 US. Cl. 417/475, 417/477 Int. Cl. F04b 43/08, F04b 43/12, FO4b 45/06 Field of Search 417/475, 477, 476; 418/45 References Cited UNITED STATES PATENTS 7/1972 Kushner 417/477 3/1973 Gelfand. H1883 Morton 417/477 [451 Feb. 12, 1974 Bastian 417/477 Primary Examiner-Carlton R. Croyle Assistant Examiner-Richard C. Gluck [5 7 ABSTRACT A novel peristaltic pump is disclosed which comprises a support base, a shaft mounted for rotation on said support base, a rotor means mounted on said shaft at one side of said support base, motor means for driving said shaft mounted on the opposite side of said support means, said rotor means having spaced around its periphery a plurality of force bearings, in a plurality of rows spaced axially along said rotor, a half jaw mounted around the periphery of said rotor means, said half jaw having a plurality of stacked-grooved sectors spaced axially along said rotor means, said plurality of stacked-grooved sectors having individual means for independent adjustment of the radial depth of each of said stacked-grooved sectors.
2 Claims, 2 Drawing Figures PAIENIEflFiB 1 2 1914 sum 1 OF 2 SHEET 2 BF 2 IN VEN TORS 7154/, ATTORNEY PERISTALTIC PUMP WITH A PLURALITY OF CONTINUOUSLY ADJUSTABLE CHANNELS The present invention relates to the provision of a peristaltic pump with a plurality of channels, allowing the independent and continuous adjustment for each channel of the distance between the force bearing and the channel guide, so as to allow in this way the contemporaneous use of tubes of different diameter and the independent control of the delivery of each single channel. In the prior art several types of peristaltic pumps with a plurality of channels are known, which find their most suitable use in automatic chemical analysis. All these known pumps have, however, the drawback of being compelled to use tubes that are always of the same diameter and this means that, if volumes of liquids are to be mixed, having a different ratio gr/cm sec., one is compelled to work by varying the concentration ratios as it is not possible to do anything on the volumes. Furthermore, wear of the tubes and defects or variations of their outer diameter cause malfunctioning and flow unevenness in said pumps.
The object of the present invention is to remove the above mentioned drawbacks and thus to provide a peristaltic pump with a plurality of channels which, as it can accommodate tubes of any desired different diameter, allows the contemporaneous pumping of different volumetric deliveries. This is obtained in practice by making each pump channel. with a grooved sector which can be continuously adjusted in the radial dirction through a setting pin. In fact, as the sectors of the guide channels of the pump tubes may be moved more or less toward the force bearing continuously and independently of one another, in this way it is not only possible to use tubes of different diameters but also to continue the use of tubes which have become deformed through use without causing malfunctioning and flow unevenness.
The present invention will now be described in detail with reference to the accompanying drawings illustrating a preferred practical embodiment given by way of example only and without limiting the invention, as technical and structural variants may be resorted to in practice without departing from the scope of the present invention.
FIG. 1 is a top view of the peristaltic pump with a plurality of channels according to the present invention; and
FIG. 2 is a front sectional view of the pump taken along the line A-A of FIG. 1.
In said figures, reference numeral 1 indicates the support base plate of the pump, in a hole of which plate a shaft 3 is mounted through the bearing 2. Said shaft 3, the section of which is enlarged under plate I, is also rotatably supported through bearing 4 by a bracket 5 which is fixed by means of screws to the under face of the plate 1. In such a way shaft 3 may rotate only around a perfectly vertical axis and this rotation is imparted thereto by a motor 6 whose shaft 7 is keyed through key 8 to the interior of the lower part of shaft 3. A rotor 9 is inserted on the upper end of said shaft 3 and is fixedly secured thereto by the stop dowel l0. Rotor 9 has on its periphery as many circular grooves 11 as the required number of the pump channels (eight in the embodiment shown herein) and in these grooves sets of force bearings 12 (ten sets are shown in the figures of the drawings) are inserted, being supported by idle pins 13.
A solid metal half-jaw 14 is rigidly fixed on plate 1 by means of four fastening screws 15 and four locking nuts 16, in the proximity of the bearing rotor 9 and with its concavity facing it, while a tube guiding bracket 17 is mounted on said plate 1 opposite to said half-jaw 14 at the other side of rotor 9; The tube guiding bracket 17 consists of a central body 18 and two lateral blocks 19. The central body 18 is rigidly fixed to the plate 1 by means of two fastening screws 20 and two locking nuts 21 so as to be perfectly parallel to the half-jaw 14, and in proximity of its two lateral ends it has two vehical sets of holes 22 and 23 of different diameters, through some of which the various tubes 24 of the pump are being passed (eight tubes in the embodiment shown). The two lateral blocks 19 are pressed against the corresponding uprights of the body 18, each through two stud bolts 25, and are used to clamp said tubes of the pump in order to prevent them from bieng entrained by the rotation of rotor 9.
Now, according to the present invention, between the half jaw 14 and the bearing rotor 9 are placed a stacked configuration of as many grooved sectors 26 as there are pump channels. Said sectors 26 have crosssection generally in the form of a concavity corresponding to that of the half jaw 14 and their inner grooves 27 define, together with the bearings 12 of the rotor 9, the pump channels in which tubes 24 are passed. The grooved sectors 26 are also all movable in the radial direction independently from one another and in such a movement each sector is guided by the underlying sector excepting the bottom sector which is guided by the plane of the plate 1. The radial movement of each sector 26 is obtained through a threaded setting pin 28 which, being threadably supported by the half jaw 14 at its symmetry axis, urges with its end against the back of the corresponding sector 26 in a suitable recess 29 thereof.
It is therefore clear that by more or less screwing a setting pin 28 and in this way more or less radially. moving the corresponding grooved sector 26, the width of the corresponding channel is caused to be more or less changed accordingly, and this allows the use of a tube of larger or smaller diameter. On the other hand, as the position of each grooved sector with respect to the bearing rotor may be adjusted at will, independently of the position of the other grooved sectors, it is also clear that by means of the peristaltic pump being the subject matter of the present invention it is possible to use tubes of different diameters contemporaneously and moveover it is also possible to go on using tubes deformed by wear; to this end it is sufficient to adjust the channel used through the corresponding setting pin, so as to accommodate it to the new diameter of the worn tube.
What we claim is:
1. A peristaltic pump which comprises a support base, a shaft mounted for rotation on said support base, a rotor means mounted on said shaft at one side of said support base, motor means for driving said shaft mounted on the opposite side of said support base, said rotor means having spaced around its periphery a plurality of force bearings in a plurality of rows spaced axially along said rotor, a half jaw mounted around the pe riphery of said rotor means, said half jaw having a plurality of stacked-grooved sectors spaced axially along 2. A peristaltic pump according to claim 1 wherein said individual means for independent adjustment of the radial distance of each of said plurality of stackedgroove sectors comprises a threaded setting pin which is threadably supported by said half jaw.