US3597114A - Pump assembly with uniform or programmed discharge - Google Patents

Pump assembly with uniform or programmed discharge Download PDF

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Publication number
US3597114A
US3597114A US794930*A US3597114DA US3597114A US 3597114 A US3597114 A US 3597114A US 3597114D A US3597114D A US 3597114DA US 3597114 A US3597114 A US 3597114A
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US
United States
Prior art keywords
pump
conducting
cylinder
passage
piston
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.)
Expired - Lifetime
Application number
US794930*A
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English (en)
Inventor
Jiri Hrdina
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Czech Academy of Sciences CAS
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Czech Academy of Sciences CAS
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/26—Conditioning of the fluid carrier; Flow patterns
    • G01N30/28—Control of physical parameters of the fluid carrier
    • G01N30/32—Control of physical parameters of the fluid carrier of pressure or speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/0203—Burettes, i.e. for withdrawing and redistributing liquids through different conduits
    • B01L3/0206—Burettes, i.e. for withdrawing and redistributing liquids through different conduits of the plunger pump type
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • F04B11/0075—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons connected in series
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/16—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by adjusting the capacity of dead spaces of working chambers
    • 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
    • F04B7/0042—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member
    • F04B7/0046—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member for rotating distribution members
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/26—Conditioning of the fluid carrier; Flow patterns
    • G01N30/28—Control of physical parameters of the fluid carrier
    • G01N30/32—Control of physical parameters of the fluid carrier of pressure or speed
    • G01N2030/326—Control of physical parameters of the fluid carrier of pressure or speed pumps

Definitions

  • a pump assembly comprises a principal or first [54] ggg gggfisggg g gigg on cylinder with a uniformly reciprocating first piston and a suc- 1 claim 1 Drama tion line and a pressure or exit line governed by valve means at g the end of each piston stroke, and auxiliary or second cylinder [52] 11.8.
  • C1 417/265, h i a most one-half of the capacity of the first cylinder and 417/426 a uniformly reciprocating second piston cooperating with a ll".
  • My invention relates to a pump assembly causing in its discharge or pressure tubing a uniform or a programmed periodical movement of a liquid. This requirement applies to many modern laboratory methods for example to automatic chromatographic analyzers wherein the flow of liquid has to be maintained at a highly accurate mean value and wherein pulsations of the work of the pump assembly have to be avoided or at least held at a minimum. This is important because said pulsations limit the mechanical properties of the material used as a charge in the column or the like, for example causing a progressing permanent deformation of the granulated charge.
  • one or more piston pumps press the liquid simultaneously or alternately through a common discharge tubing. They work as a rule in periods of 5 to l0 seconds and each pump is governed by a special distributing device. As the discharges from the individual pistons alternate, the relevant tubings are switched over very quickly to a common exit piping by means of a special hydraulic switching device. These hydraulic switching devices are operated either mechanically by means of cams or by means of pnuematic servomotors which are equipped with a special distribution means for auxiliary pressure air. A substantial drawback of these pumps is their unusual mechanical complexity and the high requirements on accurate machining of cams, relatively large cylinders, pistons and the like.
  • a main feature of the invention resides in the fact that the uniform or freely programmed periodical movement of a liquid through at least one tubing, namely either a suction tubing or a discharge tubing, is secured by connecting at least one of the said tubings which are separated against the working space of a main pumping cylinder by a distribution member with a compensation cylinder the piston of which performs a periodical movement equal to the period of the piston of the main working pumping cylinder.
  • the movement of the piston of the compensation pump is such that the liquid is supplied into the compensation pump, or that it is discharged in another part of the period into a common tubing, at a rate which just compensates the difference between the instantaneous value of a periodically changing transportation velocity of the liquid, insofar as it is produced by the main pumping cylinder, and the mean or programmed periodically changing value of the velocity of the movement of the liquid in the relevant tubing.
  • the discharge from the pump has to be uniform. But in some cases it may be important that the movement in the suction tube of the pump or in both tubes be uniform. The most important case for practical purposes of the desired uniform discharge or displacement requires of course to provide in the above-mentioned manner a special compensation of the pulsations in the discharge tubing by means of a special compensation cylinder.
  • the advantage of the pump in accordance with the invention resides in the fact that for achieving a uniform movement in the suction or discharge tubing it is only required to connect thereto a compensation cylinder having a reciprocating piston but no distribution device such as valve means.
  • the pump in accordance with the invention can work with a long period -(for example some tens of seconds), but conveniently with a short period, for example 1 second or even less.
  • a long period for example some tens of seconds
  • a short period for example 1 second or even less.
  • any inaccuracies have such short duration in comparison with an absolutely regular discharge that they may be better tolerated than could be the case in known types of pumps with a long working period.
  • Any irregularities in pumps in accordance with the invention are manifested by so short variations about the central value of the transflux that as a rule, they completely disappear already in view of the resilience of the walls of the employed device and of the columns themselves and particularly in the case of the usual application of a manometer.
  • the plasticity of the usual types of manometers represents by itself a sufficiently large resilient capacity which in the overall connection becomes effective in combination with the resistance of the column as a filter of relatively high frequency variations, so that even without the use of any additional dampers of pulsations a sufficiently regular discharge is achieved even if the mechanism comprises irregularities which could not be tolerated in known types of pumps. But this does not mean that in the pump in accordance with the invention the existence of such irregularities would have to be considered. On the contrary, with the same accuracy of the cams it is possible for the above-mentioned reasons, particularly at higher speeds of the pump in accordance with the invention, to better achieve uniform rates of flow which lie below admissible tolerances of irregularities of absolutely uniform transflux or rate of flow.
  • the plungers 12, 22 move with uniform speed in cylinders 11, 21 in identical periods but in mutually adverse directions so that one plunger sucks material in while the other pushes material out, and vice versa.
  • the volumetric work of plunger 22 will be substantially one-half of that of plunger 12 by diminishing namely substantially halving either its stroke or its diameter in relation to plunger 12.
  • Plunger l2 sucks material into cylinder 11 through inlet line 34 and presses it out therefrom through the outlet lines 31, 33, said lines 31 and 34 being governed by the valve member 30.
  • the auxiliary or second cylinder 21 is connected to the outlet line 31 by line 32 which alternately serves as inlet or suction line and as outlet or pressure line therefor.
  • valve member 30 is operated by the jointed levers 35, 36 which are actuated by the arm 38 ofa three-armed lever 37 turnable over the stationary pin 40 and bearing rollers 41 on its shorter arms 39. These rollers are alternately displaced by the cam 42 which either rotates with shaft 17 or is at least timely coordinated with cam 16.
  • the device operates as follows:
  • plunger 12 is in its lowest position at the beginning of the pressure stroke and plunger 13 in its highest position at the beginning of its suction stroke.
  • the valve member 30 connects the principal cylinder 11 over the tubular section 31 to the exit or pressure line 33 and over the continuing section 32 with the auxiliary cylinder 21. While plunger 12 moves upward to press material formerly sucked into cylinder 11 through section 31 into the exit line 33, a portion of said material for example one-half thereof is sucked by the downwardly moving plunger 22 through tubular section 32 into cylinder 21. At the ends of these strokes the valve member 30 is turned to connect cylinder 11 with the inlet line 34 so that the downwardly moving plunger 12 again sucks material into cylinder 11. Simultaneously the upwardly moving plunger 22 presses the precedingly sucked-in material through tubular section 32 into the exit line 33 thereby assuring a programmed or constant flow therethrough.
  • the earns 17, 27 and 42 may be exchangeable against other similarly cooperating cams to provide other strokes to pistons 12 and 22 and thus to change the programmed flow through the common outlet tubing 33.
  • a small capacity uniform discharge rate pump assembly comprising a first pump and a second pump, each of said pumps having a reciprocating piston in a cylinder and a port communicating with the interior of said cylinder, said pump assembly including an inlet passage and an outlet passage and rotaryvalve means, first means for conducting fluid between said inlet passage and said valve means, second means for conducting fluid between said valve means and said second pump port, said outlet passage communicating with said second fluid-conducting means said first pump port communicating with said valve means, said rotary valve means including a rotary valve element having an interior passage having an inlet and outlet spaced from each other around the circumference of said valve element, said passage being arranged for communicating exclusively between said first conducting means and said first pump port in a first rotary position and exclusively between said second conducting means and said first pump port in a second rotary position, said first conducting means communicating with said valve means on the opposite side of said pump port from said second conducting means, said first and second conducting means having substantially equal angular spacing from said pump port for mutually exclusive alternate alignment with said passage inlet and outlet

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Clinical Laboratory Science (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Reciprocating Pumps (AREA)
US794930*A 1968-01-30 1969-01-29 Pump assembly with uniform or programmed discharge Expired - Lifetime US3597114A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS70068 1968-01-30

Publications (1)

Publication Number Publication Date
US3597114A true US3597114A (en) 1971-08-03

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ID=5339585

Family Applications (1)

Application Number Title Priority Date Filing Date
US794930*A Expired - Lifetime US3597114A (en) 1968-01-30 1969-01-29 Pump assembly with uniform or programmed discharge

Country Status (9)

Country Link
US (1) US3597114A (ja)
JP (1) JPS4937926B1 (ja)
AT (1) AT294586B (ja)
BE (1) BE723374A (ja)
CH (1) CH494898A (ja)
DE (1) DE1903723A1 (ja)
FR (1) FR1599133A (ja)
GB (1) GB1236058A (ja)
SE (1) SE344791B (ja)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994631A (en) * 1974-08-20 1976-11-30 Hostetter William L Pump and pump manifold assembly with adjustable ball valve
US4245963A (en) * 1979-02-09 1981-01-20 Waters Associates, Inc. Pump
US4352636A (en) * 1980-04-14 1982-10-05 Spectra-Physics, Inc. Dual piston pump
US4643651A (en) * 1983-08-31 1987-02-17 Groupe Industriel De Realisation Et D'application Gira S.A. Constant flow rate liquid pumping system
US20040136833A1 (en) * 2003-01-10 2004-07-15 Allington Robert W. High pressure reciprocating pump and control of the same
US20040204864A1 (en) * 2003-04-09 2004-10-14 Allington Robert W. Signal to noise ratio in chromatography
US20040204866A1 (en) * 2003-04-09 2004-10-14 Allington Robert W. Method and apparatus to enhance the signal to noise ratio in chromatography
US20040202575A1 (en) * 2003-04-09 2004-10-14 Allington Robert W. Signal to noise ratio in chromatography
US20040205422A1 (en) * 2003-04-09 2004-10-14 Allington Robert W. Signal to noise ratio in chromatography
US9714650B2 (en) 2013-06-11 2017-07-25 Matthew G. Morris, Jr. Pumping system
CN107269494A (zh) * 2017-08-14 2017-10-20 邓昌盛 气体压缩机
CN113763774A (zh) * 2021-08-29 2021-12-07 哈尔滨工程大学 一种模拟横摇运动下强迫循环流动特征的串联管路***

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211015A1 (de) * 1992-04-02 1993-10-07 Webasto Thermosysteme Gmbh Zyklisch arbeitende Fluid-Fördervorrichtung
JP6240576B2 (ja) * 2014-08-19 2017-11-29 ツバキ山久チエイン株式会社 定量シリンジ型ポンプ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US14186A (en) * 1856-02-05 Pttmp
US595942A (en) * 1897-12-21 Apparatus for mixing liquids
US676542A (en) * 1899-10-11 1901-06-18 Samuel W Luitwieler Pumping and reciprocating mechanism.
US1375200A (en) * 1918-08-05 1921-04-19 William S Barnickel Pumping apparatus
US2172103A (en) * 1936-11-10 1939-09-05 Kotaki Teizo Pump
US2205828A (en) * 1936-09-04 1940-06-25 Automotive Prod Co Ltd Pump for liquid pressure remote control systems
US2448104A (en) * 1945-12-06 1948-08-31 Chain Belt Co Differential concrete pump
US3230887A (en) * 1962-10-29 1966-01-25 Beckman Instruments Inc Even flow apparatus and method for fluid gradient engines and the like

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US14186A (en) * 1856-02-05 Pttmp
US595942A (en) * 1897-12-21 Apparatus for mixing liquids
US676542A (en) * 1899-10-11 1901-06-18 Samuel W Luitwieler Pumping and reciprocating mechanism.
US1375200A (en) * 1918-08-05 1921-04-19 William S Barnickel Pumping apparatus
US2205828A (en) * 1936-09-04 1940-06-25 Automotive Prod Co Ltd Pump for liquid pressure remote control systems
US2172103A (en) * 1936-11-10 1939-09-05 Kotaki Teizo Pump
US2448104A (en) * 1945-12-06 1948-08-31 Chain Belt Co Differential concrete pump
US3230887A (en) * 1962-10-29 1966-01-25 Beckman Instruments Inc Even flow apparatus and method for fluid gradient engines and the like

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994631A (en) * 1974-08-20 1976-11-30 Hostetter William L Pump and pump manifold assembly with adjustable ball valve
US4245963A (en) * 1979-02-09 1981-01-20 Waters Associates, Inc. Pump
US4352636A (en) * 1980-04-14 1982-10-05 Spectra-Physics, Inc. Dual piston pump
US4643651A (en) * 1983-08-31 1987-02-17 Groupe Industriel De Realisation Et D'application Gira S.A. Constant flow rate liquid pumping system
US20040136833A1 (en) * 2003-01-10 2004-07-15 Allington Robert W. High pressure reciprocating pump and control of the same
US20040151594A1 (en) * 2003-01-10 2004-08-05 Allington Robert W. High pressure reciprocating pump and control of the same
US7037081B2 (en) 2003-01-10 2006-05-02 Teledyne Isco, Inc. High pressure reciprocating pump and control of the same
US6997683B2 (en) 2003-01-10 2006-02-14 Teledyne Isco, Inc. High pressure reciprocating pump and control of the same
US20040202575A1 (en) * 2003-04-09 2004-10-14 Allington Robert W. Signal to noise ratio in chromatography
US20040205422A1 (en) * 2003-04-09 2004-10-14 Allington Robert W. Signal to noise ratio in chromatography
US20040204866A1 (en) * 2003-04-09 2004-10-14 Allington Robert W. Method and apparatus to enhance the signal to noise ratio in chromatography
US20040204864A1 (en) * 2003-04-09 2004-10-14 Allington Robert W. Signal to noise ratio in chromatography
US9714650B2 (en) 2013-06-11 2017-07-25 Matthew G. Morris, Jr. Pumping system
US10794376B2 (en) 2013-06-11 2020-10-06 Altra, Inc. Pumping system
US11939968B2 (en) 2013-06-11 2024-03-26 Altra, Inc. Pumping system
CN107269494A (zh) * 2017-08-14 2017-10-20 邓昌盛 气体压缩机
CN113763774A (zh) * 2021-08-29 2021-12-07 哈尔滨工程大学 一种模拟横摇运动下强迫循环流动特征的串联管路***

Also Published As

Publication number Publication date
SE344791B (ja) 1972-05-02
CH494898A (de) 1970-08-15
GB1236058A (en) 1971-06-16
FR1599133A (ja) 1970-07-15
DE1903723A1 (de) 1969-09-04
AT294586B (de) 1971-11-25
BE723374A (ja) 1969-04-16
JPS4937926B1 (ja) 1974-10-14

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