US3609069A - Peristaltic pump for conveying liquids in chemical apparatus - Google Patents

Peristaltic pump for conveying liquids in chemical apparatus Download PDF

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Publication number
US3609069A
US3609069A US3609069DA US3609069A US 3609069 A US3609069 A US 3609069A US 3609069D A US3609069D A US 3609069DA US 3609069 A US3609069 A US 3609069A
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Prior art keywords
pump
peristaltic
layer
flexible
plungers
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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.)
Expired - Lifetime
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Alfred Martinelli
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Polymetron Ltd
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Polymetron Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009Special features
    • F04B43/0054Special features particularities of the flexible members
    • F04B43/0072Special features particularities of the flexible members of tubular flexible members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00Machines, pumps, or pumping installations having flexible working members
    • F04B43/08Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/082Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism

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.

Description

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

Claims (6)

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 polytetrafluorethylene 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 mm.
US3609069A 1969-03-21 1969-11-17 Peristaltic pump for conveying liquids in chemical apparatus Expired - Lifetime US3609069A (en)

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CH427969 1969-03-21

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US (1) US3609069A (en)
DE (1) DE1944102A1 (en)
FR (1) FR2033730A5 (en)
GB (1) GB1228093A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288205A (en) * 1980-01-18 1981-09-08 Pako Corporation Variable volume peristaltic pump
WO1984000690A1 (en) * 1982-08-12 1984-03-01 American Hospital Supply Corp Peristaltic fluid-pumping apparatus
WO1984000691A1 (en) * 1982-08-12 1984-03-01 American Hospital Supply Corp Linear peristaltic pumping apparatus and disposable casette therefor
US4867744A (en) * 1987-05-21 1989-09-19 Baxter International Inc. Peristaltic linear pump with contoured rollers
US4967940A (en) * 1989-02-21 1990-11-06 Minnesota Mining And Manufacturing Co. Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid(s)
US5033656A (en) * 1989-02-21 1991-07-23 Minnesota Mining And Manufacturing Company Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid (s)
US5035350A (en) * 1989-02-21 1991-07-30 Minnesota Mining And Manufacturing Company Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid(s)
US5039279A (en) * 1990-03-15 1991-08-13 Abbott Laboratories Sensor for detecting fluid flow from a positive displacement pump
US5055001A (en) * 1990-03-15 1991-10-08 Abbott Laboratories Volumetric pump with spring-biased cracking valves
US5078362A (en) * 1990-03-15 1992-01-07 Abbott Laboratories Spring-biased valve for use in a positive displacement volumetic pump
US5116203A (en) * 1990-03-15 1992-05-26 Abbott Laboratories Detecting occlusion of proximal or distal lines of an IV pump
US5158437A (en) * 1990-03-15 1992-10-27 Abbott Laboratories Volumetric pump with spring-biased cracking valves
US5180287A (en) * 1990-03-15 1993-01-19 Abbott Laboratories Method for monitoring fluid flow from a volumetric pump
US5357827A (en) * 1990-03-15 1994-10-25 Abbott Laboratories Torque compensated cam assembly and method
US5660529A (en) * 1994-12-06 1997-08-26 Mcgaw, Inc. Linear peristaltic pump with reshaping fingers interdigitated with pumping elements
US6234773B1 (en) 1994-12-06 2001-05-22 B-Braun Medical, Inc. Linear peristaltic pump with reshaping fingers interdigitated with pumping elements
US20020006668A1 (en) * 2000-07-11 2002-01-17 Katsuaki Takahashi Dispensing apparatus
US20120063923A1 (en) * 2010-09-10 2012-03-15 Ly Jeff Positive grip fingers in a peristaltic pump

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE788703A (en) * 1971-09-16 1973-01-02 Rohe Scientific Corp Peristaltic pump
US4212598A (en) * 1978-07-20 1980-07-15 Energy Development Corporation Traffic-operated air-powered generating system
US4500266A (en) * 1981-09-24 1985-02-19 Amf Incorporated Linear peristaltic pump
GB8319993D0 (en) * 1982-09-15 1983-08-24 Robertson T J M Peristaltic pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083647A (en) * 1961-05-08 1963-04-02 John T Muller Metering device
US3105447A (en) * 1961-08-28 1963-10-01 Ruppert Robert Gene Pump construction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083647A (en) * 1961-05-08 1963-04-02 John T Muller Metering device
US3105447A (en) * 1961-08-28 1963-10-01 Ruppert Robert Gene Pump construction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Filled Fluorocarbons, T. O Rourke, 1964, Modern Plastics, pp. 580 581 *

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288205A (en) * 1980-01-18 1981-09-08 Pako Corporation Variable volume peristaltic pump
WO1984000690A1 (en) * 1982-08-12 1984-03-01 American Hospital Supply Corp Peristaltic fluid-pumping apparatus
WO1984000691A1 (en) * 1982-08-12 1984-03-01 American Hospital Supply Corp Linear peristaltic pumping apparatus and disposable casette therefor
US4482347A (en) * 1982-08-12 1984-11-13 American Hospital Supply Corporation Peristaltic fluid-pumping apparatus
US4493706A (en) * 1982-08-12 1985-01-15 American Hospital Supply Corporation Linear peristaltic pumping apparatus and disposable casette therefor
US4867744A (en) * 1987-05-21 1989-09-19 Baxter International Inc. Peristaltic linear pump with contoured rollers
US4967940A (en) * 1989-02-21 1990-11-06 Minnesota Mining And Manufacturing Co. Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid(s)
US5033656A (en) * 1989-02-21 1991-07-23 Minnesota Mining And Manufacturing Company Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid (s)
US5035350A (en) * 1989-02-21 1991-07-30 Minnesota Mining And Manufacturing Company Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid(s)
US5357827A (en) * 1990-03-15 1994-10-25 Abbott Laboratories Torque compensated cam assembly and method
US5055001A (en) * 1990-03-15 1991-10-08 Abbott Laboratories Volumetric pump with spring-biased cracking valves
US5039279A (en) * 1990-03-15 1991-08-13 Abbott Laboratories Sensor for detecting fluid flow from a positive displacement pump
US5116203A (en) * 1990-03-15 1992-05-26 Abbott Laboratories Detecting occlusion of proximal or distal lines of an IV pump
US5158437A (en) * 1990-03-15 1992-10-27 Abbott Laboratories Volumetric pump with spring-biased cracking valves
US5180287A (en) * 1990-03-15 1993-01-19 Abbott Laboratories Method for monitoring fluid flow from a volumetric pump
US5078362A (en) * 1990-03-15 1992-01-07 Abbott Laboratories Spring-biased valve for use in a positive displacement volumetic pump
US5660529A (en) * 1994-12-06 1997-08-26 Mcgaw, Inc. Linear peristaltic pump with reshaping fingers interdigitated with pumping elements
US5888052A (en) * 1994-12-06 1999-03-30 Mcgraw, Inc. Linear peristaltic pump with reshaping fingers intedigitated with pumping elements
US6234773B1 (en) 1994-12-06 2001-05-22 B-Braun Medical, Inc. Linear peristaltic pump with reshaping fingers interdigitated with pumping elements
US20020006668A1 (en) * 2000-07-11 2002-01-17 Katsuaki Takahashi Dispensing apparatus
US6740529B2 (en) * 2000-07-11 2004-05-25 Hitachi, Ltd. Dispensing apparatus
US20120063923A1 (en) * 2010-09-10 2012-03-15 Ly Jeff Positive grip fingers in a peristaltic pump

Also Published As

Publication number Publication date Type
GB1228093A (en) 1971-04-15 application
DE1944102A1 (en) 1970-10-01 application
FR2033730A5 (en) 1970-12-04 application

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