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Publication numberUS3609069 A
Publication typeGrant
Publication dateSep 28, 1971
Filing dateNov 17, 1969
Priority dateMar 21, 1969
Also published asDE1944102A1
Publication numberUS 3609069 A, US 3609069A, US-A-3609069, US3609069 A, US3609069A
InventorsMartinelli Alfred
Original AssigneePolymetron Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Peristaltic pump for conveying liquids in chemical apparatus
US 3609069 A
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Description  (OCR text may contain errors)

United States Patent Inventor Alli-ed Martinelll Zurich, Switzerland Appl. No. 877,300

Filed Nov. 17, 1969 Patented Sept. 28, 1971 Assignee Polymetron Ltd.

Glattbrugg, Switzerland Priority Mar. 21, 1969 Switzerland 4279/69 PERISTALTIC PUMP FOR CONVEYING LIQUIDS IN CHEMICAL APPARATUS 6 Claims, 1 Drawing Fig.

U.S. Cl 417/474 ..F04b 43/08, 04b 34/12, F04b 45/06 Field of Search 417/474,

[5 6] References Cited UNITED STATES PATENTS 3,083,647 4/1963 Muller 417/474 3,105,447 10/1963 Ruppert 417/475 OTHER REFERENCES Filled Fi'uorocarbons, T. O Rourke, 1964, Modern Plastics, pp. 580- 581 Primary Examiner-Carlton R. Croyle Assistant Examiner-R. E. Gluck Attorney-Craig, Antonelli & l-lill ABSTRACT: A peristaltic pump for conveying liquids in chemical apparatus having a plurality of plungers. A flexible layer of a material such as polytetrafluorethylene is arranged under tension between the plungers and the hoses containing the liquid to be pumped. The flexible layer of material adapts itself to the level of the surfaces of the individual plungers and, thereby increases the service life of the hoses.

PERISTALTIC PUMP FOR CONVEYING LIQUIDS IN CHEMICAL APPARATUS BACKGROUND OF THE INVENTION The present invention relates to a peristaltic pump for conveying liquids in chemical apparatus, and more particularly to a peristaltic pump having a flexible layer of material which adapts itself to the level of the surfaces of the individual plungers of the pump.

Peristaltic or hose pumps are normally designed in such a manner that one or more of the adjacent hoses containing the liquid to be conveyed are periodically squeezed together by a plurality of mechanically operated plungers arranged one behind the other in the direction of the hoses. As a result of this arrangement, the liquid contained in the hoses is forced along in one direction and sucked through from the other side.

In conventional peristaltic pumps, the hoses are subjected to considerable mechanical wear. For this reason, the hoses in these pumps have to be frequently replaced. Despite the use of high-grade hose material, main areas of wear and tear still occur around the edges of the pump plungers.

SUMMARY OF THE INVENTION It is the aim of the present invention to provide a peristaltic pump of the aforementioned type, the hose of which has a considerably increased service life.

The underlying problems are solved in accordance with the present invention by providing a flexible layer of material which adapts itself to the level of the individual plunger surfaces and which is secured under tension between the plungers and the hoses.

The arrangement of the present invention assures that the surfaces of the plungers will not press directly upon the hoses. Further, the walls of the hoses follow steadily, rather than jerkily, any changes in the level of the plunger surfaces in cases where the plunger surfaces are arranged at different levels.

Accordingly, it is an object of the present invention to provide a peristaltic pump which avoids by simple means the shortcomings and disadvantages encountered in the prior art.

Another object of present invention is in making readily possible the considerable increase in the surface life of the hoses employed in the peristaltic pump.

BRIEF DESCRIPTION OF THE DRAWING These and further objects, features and advantages of the present invention will become more apparent from the following description when taken in connection with the accompanying drawing which shows, for purposes of illustration only, an embodiment in accordance with the present invention, and wherein:

The sole FIGURE is a sectional elevation view of a peristaltic pump in accordance with the present invention.

DETAILED DESCRIPTION OF THE DRAWING The camshaft FIGURE illustrates a peristaltic pump, generally designated by the numeral 1, in which a plurality of plungers 10 are periodically raised and lowered through, for example, a camshaft (not shown) so as to squeeze one or more hoses 2 arranged one behind the other in a bed 3 at different points along the length of hoses. By selectively controlling the movement of the plungers 10, the contents of the hoses 2 are continuously forced along in a desired unilateral direction. The hoses 2 are mounted in hose couplings 4, 5 to which supply and discharge lines 6, 7 are connected.

As shown in the sole FIGURE, the plungers l0 and the hoses 2 are separated by a layer of material 8. Orie end of the layer 8 is fixed to the pump housing by conventional securing means 9 and the other end of the layer 8 is resiliently anchored to a spring 20. The layer 8 may be made of polytetrafluorethylene reinforced with glass fiber and having a thickness of from 0.2 mm. to 1.5 mm. By the use of this intermediate layer 8, ll. 18 possible to lengthen the service life of the hoses 2 from an original service life of 400 hours to a service life of 2,000 hours. In the case of conventional peristaltic pump arrangements, the hoses were already defective by the time that 2,000 hours of service life was reached as a result of the squeezing effect of the plungers.

While I have shown and described one embodiment in accordance with the present invention, it is understood that the same is not limited thereto but is susceptible of numerous changes and modifications as known to a person skilled in the art, and I, therefore, do not wish to be limited to the details shown and described herein but intend to cover all such changes and modifications as encompassed by the scope of the invention.

I claim:

1. A peristaltic pump for conveying liquid including a pump housing, at least one hose for conveying the liquid to be pumped and a plurality of plungers operatively associated with said pump housing and adapted to be selectively moved into squeezing engagement with said at least one hose so as to pump the liquid in a desired unilateral direction, characterized in that a flexible layer of material is arranged between the surfaces of said plungers and said at least one hose, wherein one end of said flexible layer is fixedly connected a tone side of the pump housing and the other end of said flexible layer is resiliently connected at the pump housing, whereby the wall of said at least one hose steadily follows any changes in the level of the surfaces of said plungers.

2. A peristaltic pump according to claim 1, wherein said flexible layer consists of polytetrafluorethylene reinforced with glass fiber.

3. A peristaltic pump according to claim 1, wherein said flexible layer has a thickness between about 0.2 and 1.5 mm.

4. A peristaltic pump according to claim 1, wherein said flexible layer consists of poltetrafluorethylene reinforced with glass fiber and has a thickness between about 0.2 to 1.5 mm.

5. A peristaltic pump according to claim 1, wherein said flexible layer is attached at the pump housing under tension.

6. A peristaltic pump according to claim 5, wherein said flexible layer consists of polytetrafluorethylene reinforced with glass fiber and has a thickness between about 0.2 to 1.5

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3083647 *May 8, 1961Apr 2, 1963Muller John TMetering device
US3105447 *Aug 28, 1961Oct 1, 1963Gene Ruppert RobertPump construction
Non-Patent Citations
Reference
1 * Filled Fluorocarbons, T. O Rourke, 1964, Modern Plastics, pp. 580 581
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4288205 *Jan 18, 1980Sep 8, 1981Pako CorporationVariable volume peristaltic pump
US4482347 *Aug 12, 1982Nov 13, 1984American Hospital Supply CorporationPeristaltic fluid-pumping apparatus
US4493706 *Aug 12, 1982Jan 15, 1985American Hospital Supply CorporationLinear peristaltic pumping apparatus and disposable casette therefor
US4867744 *May 21, 1987Sep 19, 1989Baxter International Inc.Peristaltic linear pump with contoured rollers
US4967940 *Feb 21, 1989Nov 6, 1990Minnesota Mining And Manufacturing Co.Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid(s)
US5033656 *Aug 22, 1990Jul 23, 1991Minnesota Mining And Manufacturing CompanyMethod and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid (s)
US5035350 *Aug 22, 1990Jul 30, 1991Minnesota Mining And Manufacturing CompanyMethod and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid(s)
US5039279 *Mar 15, 1990Aug 13, 1991Abbott LaboratoriesSensor for detecting fluid flow from a positive displacement pump
US5055001 *Mar 15, 1990Oct 8, 1991Abbott LaboratoriesVolumetric pump with spring-biased cracking valves
US5078362 *Jun 4, 1991Jan 7, 1992Abbott LaboratoriesSpring-biased valve for use in a positive displacement volumetic pump
US5116203 *Aug 12, 1991May 26, 1992Abbott LaboratoriesDetecting occlusion of proximal or distal lines of an IV pump
US5158437 *Aug 8, 1991Oct 27, 1992Abbott LaboratoriesMethod for preventing variations in fluid supply pressure
US5180287 *Aug 12, 1991Jan 19, 1993Abbott LaboratoriesMethod for monitoring fluid flow from a volumetric pump
US5357827 *Jul 31, 1991Oct 25, 1994Abbott LaboratoriesTorque compensated cam assembly and method
US5660529 *Dec 6, 1994Aug 26, 1997Mcgaw, Inc.Linear peristaltic pump with reshaping fingers interdigitated with pumping elements
US5888052 *Aug 26, 1997Mar 30, 1999Mcgraw, Inc.Linear peristaltic pump with reshaping fingers intedigitated with pumping elements
US6234773Oct 12, 1998May 22, 2001B-Braun Medical, Inc.Linear peristaltic pump with reshaping fingers interdigitated with pumping elements
US6740529 *Feb 22, 2001May 25, 2004Hitachi, Ltd.Dispensing apparatus
US20120063923 *Sep 10, 2010Mar 15, 2012Ly JeffPositive grip fingers in a peristaltic pump
WO1984000690A1 *Aug 9, 1983Mar 1, 1984American Hospital Supply CorpPeristaltic fluid-pumping apparatus
WO1984000691A1 *Aug 9, 1983Mar 1, 1984American Hospital Supply CorpLinear peristaltic pumping apparatus and disposable casette therefor
Classifications
U.S. Classification417/474
International ClassificationF04B43/08, F04B43/00
Cooperative ClassificationF04B43/0072, F04B43/082
European ClassificationF04B43/00D8T, F04B43/08B