EP0039146A1 - Differentialkolbenpumpe - Google Patents

Differentialkolbenpumpe Download PDF

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Publication number
EP0039146A1
EP0039146A1 EP81301477A EP81301477A EP0039146A1 EP 0039146 A1 EP0039146 A1 EP 0039146A1 EP 81301477 A EP81301477 A EP 81301477A EP 81301477 A EP81301477 A EP 81301477A EP 0039146 A1 EP0039146 A1 EP 0039146A1
Authority
EP
European Patent Office
Prior art keywords
chamber
piston portion
piston
chambers
port
Prior art date
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.)
Withdrawn
Application number
EP81301477A
Other languages
English (en)
French (fr)
Inventor
Edmund Earl Buzza
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beckman Coulter Inc
Original Assignee
Beckman Instruments Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beckman Instruments Inc filed Critical Beckman Instruments Inc
Publication of EP0039146A1 publication Critical patent/EP0039146A1/de
Withdrawn legal-status Critical Current

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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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F04B13/02—Pumps specially modified to deliver fixed or variable measured quantities of two or more fluids at the same time
    • 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
    • F04B5/00—Machines or pumps with differential-surface pistons
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving

Definitions

  • the invention relates to the field of fluid handling. More particularly, the invention relates to a fluid control system in a measuring and testing instrument.
  • the invention is a pump utilizing a single piston of varying diameter connected to a single driving source.
  • Measuring and testing instruments involving liquid handling often require movement of two or more liquids to or from remote locations. For example, many instruments require dilution of two or more liquids in a fixed ratio. Many times it is desirable to do this dilution on a continuous basis as opposed to serially dispensing and mixing these liquids. Continuous dilutions would be useful in many chemical or biological analyzers such as continuous flow, stop flow, flame photometers, or atomic absorption photometers.
  • peristaltic pumps or multiple piston positive displacement pumps for continuous dilutions. While suited for their intended purpose, peristaltic type pumps can tolerate only modest back pressure without leaking. Even if different diameter tubes are used on the same roller displacement mechanism, different pressure phases are present which may alter the dilution ratio during each cycle. For large ratio dilutions, either one extremely small or large diameter flexible tube must be used. This may be disadvantageous in pump and system design.
  • the invention is a multiple chamber piston positive displacement pump.
  • a body portion defines a plurality of chambers with each chamber effectively sealed from each adjacent chamber.
  • a single piston with varying diameter is coupled to a single driving source.
  • the piston diameters are sized to cooperatively displace a predetermined volume in each chamber.
  • At least one port communicates with each chamber. These ports are valved to control the direction of fluid flow through each chamber.
  • a body portion defines a first chamber and a second chamber adjacently mounted along a single axis. Each chamber is substantially sealed from the adjacent chamber. An inlet port and outlet port communicate with each chamber.
  • a first piston portion is connected to a driving mechanism and is movable into and out of the first chamber.
  • a second piston portion of predetermined volume is joined to the first piston portion and is movable into and out of the first and second chambers. The difference in piston diameters controls the ratio of liquid displaced in each chamber by the associated piston portion.
  • a housing 11 defines a first chamber 12 and a second chamber 13.
  • a first piston portion 14 and a second piston portion 15 are movably mounted in chambers 12 and 13 respectively. While pistons 14 and 15 may be separate units these pistons are milled from the same casting in the preferred embodiment.
  • Piston 14 is coupled with a reciprocating drive (not shown) such that pistons 14 and 15 are mutually driven by the reciprocating drive.
  • An inlet port 16 and an outlet port 17 communicate with first chamber 12.
  • An inlet port 18 and an outlet port 19 communicate with second chamber 13.
  • a seal 21 cooperates with first piston portion 14 and housing 11 to seal first chamber 12 from the outside atmosphere.
  • a seal 22 cooperates with second piston portion 15 to substantially seal second chamber 13 from first chamber 12.
  • Each of inlet ports 16 and 18 and each of outlet ports 17 and 19 are connected to a flexible tube 20.
  • housing 11 is shown with inlet ports 16 and 18 and outlet ports 17 and 19 connected to flexible tube 20.
  • First piston portion 14 is movably mounted in housing 11.
  • a reciprocating drive (not shown) is connected to first piston portion 14.
  • housing 11 defines first chamber 12 and second chamber 13.
  • First piston portion 14 and second piston portion 15 are connected to each other and to an external drive source which may be any conventional reciprocating drive.
  • First piston portion 14 slides through seal 21 and second piston portion 15 slides through seal 22.
  • the volume displaced by second piston portion 15 in second chamber 13 is the area of second piston portion 15 ( ⁇ R 15 2 ) times the length of the drive stroke (L) where R 15 is the radius of piston portion 15.
  • the volume displaced in first chamber 12 is equal to the difference in volume displaced by first piston portion 14 and second piston portion 15. That is, the displaced volume is equal to ⁇ L(R 14 2 - R 15 2 ) where R 14 is the radius of. piston portion 14.
  • the total volume displaced in both chambers is ⁇ LR 14 2 .
  • the volume displaced in chamber 12 will equal the volume displaced in chamber 13 when R 14 equals the square root of 2 times R 15 .
  • the diameters of pistons 14 and 15 can thus be varied to achieve any dilution ratio.
  • moderate dilution ratios are desired, it is convenient to use second chamber 13 for the sample liquid and first chamber 12 for the diluent.
  • the difference in diameters required are prohibitive. That is, the diameter of the second piston portion 15 must be very small in relation to that of first piston portion 14. This requires making piston portion 15 very small or piston portion 14 very large.
  • the diameter of second piston portion 15 may be so small as to be prohibitive.
  • the first chamber 12 may be used for the sample and second chamber 13 may be used for the diluent.
  • piston portion 14 is made slightly larger than piston portion 15 because a small difference in diameter between first piston portion 14 and second piston portion 15 would result in the dispensing of an extremely small sample volume.
  • Inlet ports 16 and 18 and outlet ports 17,and 19 are controlled by a suitable valving and logic such that sample substances and diluent substances may be picked up from different locations and combined at a continuous fixed ratio in a remote location. That is, referring to Fig. 1, assuming that the pump and tubes have been primed with the desired liquids and ports 16 and 19 are open to diluent and sample reservoirs, respectively, then downward motion of first piston portion 14 and second piston portion 15 will draw diluent substance and calibration substance substantially filling first chamber 12 and second chamber 13, respectively. Any air contained in the chambers will rise to the top and be carried out through the outlet ports upon dispensing. The volumes drawn in depend upon the diameters of first piston 14 and second piston portion 15 as explained above.
  • sample liquid is drawn from a remote location into flexible tube 20 connected to outlet port 19 by the downward motion of piston portion 15 while calibration on other liquid is drawn into chamber 13.
  • inlet ports 16 and 18 are closed and outlet ports 17 and 19 are open, then upward motion of the first piston portion 14 and second piston portion 15 will dispense diluent substance and sample substance in a fixed ratio dependent on the diameters of piston portions. A fixed ratio dilution is thus accomplished.
  • Flexible tubing 20 from outlet ports 17 and 19 could also be connected to a tee portion where calibration or other substances could be combined with diluent substance.
  • the disclosed invention retains the advantages of positive displacement piston pumps over peristaltic types and also avoids any variation in ratio due to speed, backlash, or errors in drive source phasing encountered with prior pumps using multiple driving sources. Because it utilizes a single drive source and piston, the pump is simpler and more economical to construct and operate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Sampling And Sample Adjustment (AREA)
EP81301477A 1980-04-24 1981-04-06 Differentialkolbenpumpe Withdrawn EP0039146A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14323980A 1980-04-24 1980-04-24
US143239 1980-04-24

Publications (1)

Publication Number Publication Date
EP0039146A1 true EP0039146A1 (de) 1981-11-04

Family

ID=22503200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81301477A Withdrawn EP0039146A1 (de) 1980-04-24 1981-04-06 Differentialkolbenpumpe

Country Status (2)

Country Link
EP (1) EP0039146A1 (de)
JP (1) JPS56169480U (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101161B1 (de) * 1982-08-16 1987-03-11 TECHNICON INSTRUMENTS CORPORATION (a New York corporation) Verfahren und Vorrichtung zur gleichzeitigen Förderung zweier Flüssigkeiten durch eine Analysenzelle
DE3630992A1 (de) * 1986-09-11 1988-03-17 Siemens Ag Vorrichtung zum dosieren und mischen von stoffen
GB2254894A (en) * 1991-03-28 1992-10-21 Peter Brooke Evans Pump for fluid, and suction cleaning device incorporating same.
FR2719342A1 (fr) * 1994-05-02 1995-11-03 Chatelain Michel Piston étagé pour moteur, pompe ou compresseur.
RU2131060C1 (ru) * 1997-11-18 1999-05-27 Научно-производственное предприятие "Агродизель" Многокомпонентный дозирующий насос
US6520618B2 (en) * 2000-02-24 2003-02-18 Canon Kabushiki Kaisha Pump, device for recovering liquid ejection and image forming apparatus equipped with the pump
FR2844310A1 (fr) * 2002-09-06 2004-03-12 Dosatron International Dispositif de dosage de liquide permettant une injection de plusieurs liquides differents
US20150086386A1 (en) * 2012-04-23 2015-03-26 Siemens Healthcare Diagnostics Inc. Multi-chamber pump apparatus, systems, and methods
US10267303B2 (en) 2013-08-30 2019-04-23 Flow Control Llc. High viscosity portion pump

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091186A (en) * 1959-10-02 1963-05-28 Bran & Luebbe Pumping method and pumps for suspensions

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091186A (en) * 1959-10-02 1963-05-28 Bran & Luebbe Pumping method and pumps for suspensions

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101161B1 (de) * 1982-08-16 1987-03-11 TECHNICON INSTRUMENTS CORPORATION (a New York corporation) Verfahren und Vorrichtung zur gleichzeitigen Förderung zweier Flüssigkeiten durch eine Analysenzelle
DE3630992A1 (de) * 1986-09-11 1988-03-17 Siemens Ag Vorrichtung zum dosieren und mischen von stoffen
GB2254894A (en) * 1991-03-28 1992-10-21 Peter Brooke Evans Pump for fluid, and suction cleaning device incorporating same.
GB2254894B (en) * 1991-03-28 1995-01-25 Peter Brooke Evans Pump for fluid, and suction cleaning device incorporating same
FR2719342A1 (fr) * 1994-05-02 1995-11-03 Chatelain Michel Piston étagé pour moteur, pompe ou compresseur.
WO2004074716A1 (fr) * 1994-05-02 2004-09-02 Michel Chatelain Piston etage pour moteur, pompe ou compresseur
RU2131060C1 (ru) * 1997-11-18 1999-05-27 Научно-производственное предприятие "Агродизель" Многокомпонентный дозирующий насос
US6520618B2 (en) * 2000-02-24 2003-02-18 Canon Kabushiki Kaisha Pump, device for recovering liquid ejection and image forming apparatus equipped with the pump
FR2844310A1 (fr) * 2002-09-06 2004-03-12 Dosatron International Dispositif de dosage de liquide permettant une injection de plusieurs liquides differents
US20150086386A1 (en) * 2012-04-23 2015-03-26 Siemens Healthcare Diagnostics Inc. Multi-chamber pump apparatus, systems, and methods
EP2855934A4 (de) * 2012-04-23 2016-05-04 Siemens Healthcare Diagnostics Mehrkammerpumpvorrichtung, -systeme und -verfahren
US10267303B2 (en) 2013-08-30 2019-04-23 Flow Control Llc. High viscosity portion pump

Also Published As

Publication number Publication date
JPS56169480U (de) 1981-12-15

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB IT

17P Request for examination filed

Effective date: 19820426

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19830926

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BUZZA, EDMUND EARL