EP0039146A1 - Multiple chamber pump - Google Patents
Multiple chamber pump Download PDFInfo
- 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- Withdrawn
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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.
Abstract
A single piston having multiple piston portions (14,15) one in each of the chambers (12,13) is connected to a single driving source. Variation in piston portion size allows variation in the ratio of liquids pumped through each chamber.
Description
- 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. By way of further characterization but not by way of limitation thereto, 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.
- Prior instruments have used 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.
- Multiple piston pumps, while suited for their intended purpose, disadvantageously require some piston diameters to be extremely small where small volume and high dilution ratios are used. In addition, multiple piston pumps in prior devices require mechanical coupling or a separate driving mechanism for each piston and are therefore subject to variations in driving speed, phasing, and backlash.
- 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.
- In the preferred embodiment, 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.
-
- Fig. 1 is a partial sectional view of a pump in accordance with the preferred embodiment of the invention; and
- Fig. 2 is a perspective view of the pump.
- Referring to Fig. 1, a housing 11 defines a
first chamber 12 and asecond chamber 13. Afirst piston portion 14 and asecond piston portion 15 are movably mounted inchambers pistons pistons inlet port 16 and anoutlet port 17 communicate withfirst chamber 12. Aninlet port 18 and anoutlet port 19 communicate withsecond chamber 13. Aseal 21 cooperates withfirst piston portion 14 and housing 11 to sealfirst chamber 12 from the outside atmosphere. Aseal 22 cooperates withsecond piston portion 15 to substantially sealsecond chamber 13 fromfirst chamber 12. Each ofinlet ports outlet ports flexible tube 20. - Referring to Fig. 2, housing 11 is shown with
inlet ports outlet ports flexible tube 20.First piston portion 14 is movably mounted in housing 11. A reciprocating drive (not shown) is connected tofirst piston portion 14. - Referring to Fig. 1, housing 11 defines
first chamber 12 andsecond chamber 13.First piston portion 14 andsecond 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 throughseal 21 andsecond piston portion 15 slides throughseal 22. Assumingpiston portion 14 andpiston portion 15 are cylindrical, the volume displaced bysecond piston portion 15 insecond chamber 13 is the area of second piston portion 15 (πR15 2) times the length of the drive stroke (L) where R15 is the radius ofpiston portion 15. The volume displaced infirst chamber 12 is equal to the difference in volume displaced byfirst piston portion 14 andsecond piston portion 15. That is, the displaced volume is equal to πL(R14 2 - R15 2) where R14 is the radius of.piston portion 14. The total volume displaced in both chambers is πLR14 2. The volume displaced inchamber 12 will equal the volume displaced inchamber 13 when R14 equals the square root of 2 times R15. - The diameters of
pistons second chamber 13 for the sample liquid andfirst chamber 12 for the diluent. When the dilution ratio is large, however, the difference in diameters required are prohibitive. That is, the diameter of thesecond piston portion 15 must be very small in relation to that offirst piston portion 14. This requires makingpiston portion 15 very small orpiston portion 14 very large. The diameter ofsecond piston portion 15 may be so small as to be prohibitive. In such a case, thefirst chamber 12 may be used for the sample andsecond chamber 13 may be used for the diluent. Thus,piston portion 14 is made slightly larger thanpiston portion 15 because a small difference in diameter betweenfirst piston portion 14 andsecond piston portion 15 would result in the dispensing of an extremely small sample volume. -
Inlet ports outlet ports ports first piston portion 14 andsecond piston portion 15 will draw diluent substance and calibration substance substantially fillingfirst chamber 12 andsecond 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 offirst piston 14 andsecond piston portion 15 as explained above. Preferably, sample liquid is drawn from a remote location intoflexible tube 20 connected tooutlet port 19 by the downward motion ofpiston portion 15 while calibration on other liquid is drawn intochamber 13. Ifinlet ports outlet ports first piston portion 14 andsecond 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 fromoutlet ports - . 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.
- While particular forms of the invention have been disclosed with respect to a preferred embodiment thereof, it is not to be so limited as changes and modifications may be made without departing from the scope of the invention. For example, the principle of operation may be extended to multiple chamber pumps with variations in piston portion diameters all driven by a single driving source. Another variation would be to have the diameter of
piston portion 14 be less than that ofpiston portion 15. In that case the displacement infirst chamber 12 andsecond chamber 13 would be positively out of phase, that is, while one chamber would be pumping the other would be aspirating. This arrangement would allow continuous pumping. Whilepistons portions chambers - The foregoing description, taken together with the appended claims, constitutes a disclosure which enables one skilled in the art and having the benefit of the teachings contained therein to make and use the invention. Further, the structure herein described constitutes a meritorious advance in the art which is unobvious to such skilled workers not having the benefit of these teachings.
Claims (3)
1. An apparatus for pumping liquids in fixed ratios comprising:
a housing including a plurality of chambers, each chamber effectively sealed from each adjacent chamber;
at least one port communicating with each said chamber, said port connectible to a valving system;
a single piston including a plurality of piston portions coupled to a single driving source, each said piston portion movably mounted in a corresponding one of said plurality of chambers, each said piston portion sized to displace a predetermined volume in each said chamber; and
whereby said driving source moves said piston portions in said chambers thereby pumping liquid through each said chamber and its corresponding port.
2. Apparatus according to claim 1 wherein said housing includes:
a first chamber and a second chamber adjacently mounted therein along a single axis, said chambers including a substantially sealed portion therebetween.
3. Apparatus according to claim 2 wherein said piston includes:
a first piston portion having a predetermined cross-sectional area and connected to a driving mechanism, said first piston portion movable into and out of said first chamber; and
a second piston portion having a predetermined cross-sectional area, said second piston portion connected to said first piston portion, said second piston portion movable into and out of said first chamber and said second chamber.
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 (en) | 1981-11-04 |
Family
ID=22503200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81301477A Withdrawn EP0039146A1 (en) | 1980-04-24 | 1981-04-06 | Multiple chamber pump |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0039146A1 (en) |
JP (1) | JPS56169480U (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0101161A2 (en) * | 1982-08-16 | 1984-02-22 | TECHNICON INSTRUMENTS CORPORATION (a New York corporation) | Apparatus and method for passing two fluids simultaneously through an analytical flow cell |
DE3630992A1 (en) * | 1986-09-11 | 1988-03-17 | Siemens Ag | Apparatus for metering and mixing materials |
GB2254894A (en) * | 1991-03-28 | 1992-10-21 | Peter Brooke Evans | Pump for fluid, and suction cleaning device incorporating same. |
FR2719342A1 (en) * | 1994-05-02 | 1995-11-03 | Chatelain Michel | Staged piston for use in engines, compressors and pumps |
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 (en) * | 2002-09-06 | 2004-03-12 | Dosatron International | Assembly for the dosed injection of liquid additives, into water, has a piston plunger moving in alternating directions through a sleeve divided into sealed compartments for the different additives, with their own suction/injection openings |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3091186A (en) * | 1959-10-02 | 1963-05-28 | Bran & Luebbe | Pumping method and pumps for suspensions |
-
1981
- 1981-04-06 EP EP81301477A patent/EP0039146A1/en not_active Withdrawn
- 1981-04-23 JP JP5798781U patent/JPS56169480U/ja active Pending
Patent Citations (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0101161A2 (en) * | 1982-08-16 | 1984-02-22 | TECHNICON INSTRUMENTS CORPORATION (a New York corporation) | Apparatus and method for passing two fluids simultaneously through an analytical flow cell |
EP0101161B1 (en) * | 1982-08-16 | 1987-03-11 | TECHNICON INSTRUMENTS CORPORATION (a New York corporation) | Apparatus and method for passing two fluids simultaneously through an analytical flow cell |
DE3630992A1 (en) * | 1986-09-11 | 1988-03-17 | Siemens Ag | Apparatus for metering and mixing materials |
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 (en) * | 1994-05-02 | 1995-11-03 | Chatelain Michel | Staged piston for use in engines, compressors and pumps |
WO2004074716A1 (en) * | 1994-05-02 | 2004-09-02 | Michel Chatelain | Stepped piston for an engine, pump or compressor |
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 (en) * | 2002-09-06 | 2004-03-12 | Dosatron International | Assembly for the dosed injection of liquid additives, into water, has a piston plunger moving in alternating directions through a sleeve divided into sealed compartments for the different additives, with their own suction/injection openings |
US20150086386A1 (en) * | 2012-04-23 | 2015-03-26 | Siemens Healthcare Diagnostics Inc. | Multi-chamber pump apparatus, systems, and methods |
EP2855934A4 (en) * | 2012-04-23 | 2016-05-04 | Siemens Healthcare Diagnostics | Multi-chamber pump apparatus, systems, and methods |
US10267303B2 (en) | 2013-08-30 | 2019-04-23 | Flow Control Llc. | High viscosity portion pump |
Also Published As
Publication number | Publication date |
---|---|
JPS56169480U (en) | 1981-12-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
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 |