EP0050296B1 - Pulsationsfreie Messpumpe - Google Patents

Pulsationsfreie Messpumpe Download PDF

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Publication number
EP0050296B1
EP0050296B1 EP19810108256 EP81108256A EP0050296B1 EP 0050296 B1 EP0050296 B1 EP 0050296B1 EP 19810108256 EP19810108256 EP 19810108256 EP 81108256 A EP81108256 A EP 81108256A EP 0050296 B1 EP0050296 B1 EP 0050296B1
Authority
EP
European Patent Office
Prior art keywords
circuit
pulsation
driving motor
signal
cam
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
Application number
EP19810108256
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English (en)
French (fr)
Other versions
EP0050296A1 (de
Inventor
Takashi Akiba
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.)
Nikkiso Co Ltd
Original Assignee
Nikkiso Co Ltd
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 Nikkiso Co Ltd filed Critical Nikkiso Co Ltd
Publication of EP0050296A1 publication Critical patent/EP0050296A1/de
Application granted granted Critical
Publication of EP0050296B1 publication Critical patent/EP0050296B1/de
Expired 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
    • 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
    • F04B49/20—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 changing the driving speed
    • 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
    • F04B11/0058—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed

Definitions

  • This invention relates to an improvement in a pulsation-free reciprocating volumetric pump of the type in which two plungers are reciprocated by means of a cam so as to provide a combined discharge volume through pumping action of said plungers and in which a driving motor is connected to said cam, and a circuit is connected to said driving motor for controlling rotational rate and comprises a circuit for setting the rotational rate, a main amplifier, and a tachogenerator for feeding back an output of said driving motor to said main amplifier.
  • DE-B-27 37 062 relates to a pulsation-free pump of the aforementioned type wherein each pump carries out a precompression stroke before each delivery stroke for compensating the compressibility of the fluid.
  • This pump requires a precompression stroke and the length of the precompression stroke is constant. Further the rotation rate of the cam driving said plungers is adjusted during said stroke.
  • DE-A-27 59 056 relates to the controlling of a reciprocating pump but not to a pulsations-free pump, wherein a driving apparatus for reciprocating a piston is provided with an adjusting device for increasing the speed of the driving apparatus over a given period of an operating cycle of the piston so that a length of delivery period may be increased in relation to the total time of each operating cycle.
  • This reference only suggests the speed control of the driving apparatus for reciprocating the piston but neither teaches nor suggests any technical means for achieving the pulsation-free pump.
  • a pump as illustrated in Fig. 1 of the present application may obtain, from its constructional view points, the pulsation-free property as shown in Fig. 2(a) and provide the pulsation-free combined discharge volume.
  • the former method has such disadvantages that the pulsation nevertheless increases in a zone having a relative low discharging pressure because of less compression or less back-flow of the liquid, and that the effect of reducing the pulsation through correction decreases as the pressure applied by a corrected curve of the cam is deviated from the pressure actually employed.
  • the latter method has such a disadvantage that the average discharging pressure determined for the several strokes can not be followed up by the variation in the actual discharging pressure.
  • the methods I and II have a common disadvantage in that an irregular pulsation, incapable of being corrected for, appears so that the variation in the actual discharge volume depends largely on the cam characteristics.
  • a general object of the invention is to provide a pulsation-free volumetric pump which is simple in construction and allows stable and pulsation-free volumetric pumping.
  • a principal object of the invention is to provide a pulsation-free reciprocating volumetric pump in which two plungers are reciprocated by means of a cam so as to provide a combined discharge volume through pumping action of the plungers.
  • the invention is characterised in that said driving motor comprises a direct current motor having a mechanical time constant below 12 msec, and that said volumetric pump further comprises another circuit for detecting a pressure of said combined discharge volume and for correcting a control signal of said rotation controlling circuit through the detected signal, said another circuit comprising a pressure detector connected to a piping which provides the combined discharge volume through pumping action of said two plungers, a circuit for eliminating a direct current portion from the output signal of said pressure detector, and an amplifying circuit, a signal from said amplifying circuit being converted to a reverse phase and added to a signal from said rotation setting circuit for correction.
  • FIG 3 illustrates a diagram of a controlling system for the pump according to the invention, wherein the reference 30 shows a reciprocating plunger-type pump having two plungers as shown, for example, in Figure 1.
  • the reference 30 shows a reciprocating plunger-type pump having two plungers as shown, for example, in Figure 1.
  • From the two pumping chambers of the plunger-type pump 30 are derived respective discharge pipings which are joined together to form a piping 32, to which is connected a pressure detector 34.
  • a signal generated from the pressure detector 34 is fed back through a circuit 36 for eliminating a DC component and an amplifying circuit 38 in order to control variation in a discharging pressure.
  • a driving motor 40 for driving a rotary cam of the plunger-type pump 30, an output of which motor 40 is transmitted to the rotary cam shaft optionally through a convenient gear 42.
  • the driving motor 40 is controlled for its rotational rate through a main amplifier 46, while the rotational rate provided by the rotation setting circuit 44 is corrected by the signal from the pressure detector 34. Further, to the driving motor 40 is connected a tachogenerator 48, and output of which is fed back to the main amplifier 46.
  • an output signal as shown in Figure 4(a) is obtained from the pressure detector 34.
  • the resulting output signal is freed from a DC component by the circuit 36 for eliminating the latter, because only a variable or ripple portion is to be treated, but not an absolute value.
  • the signal after elimination of the DC component is amplified by the amplifying circuit 38 to give a characteristic curve, as shown in Figure 4(b).
  • the signal thus obtained is converted to a reverse phase, as shown in Fig. 4(c) and added to a signal from the rotation setting circuit 44, thereafter fed to the main amplifier 46 for obtaining an output, as shown in Figure 4(d).
  • the variation in the discharging pressure of the pump is kept extremely low through detection of the discharging pressure and thereby negative feedback control of the rotational rate of the driving motor.
  • the inertia of each component should be kept as low as possible, and especially a response characteristic of the driving motor 40 is most important.
  • various experiments have been carried out to find out that the pulsation may be readily reduced to much lower level, for example one fifth or lower, in comparison with the conventional system based only on the cam property, by use of a DC motor having a mechanical time constant below 12 msec.
  • the mechanical time constant is higher than 15 msec, it has been found that the variation of the discharging pressure is difficult to be sufficiently followed up and controlled, so that the reduction of pulsation could not be expected.
  • the pump according to the invention has such advantages that the pulsation of the discharged fluid from the pump may be corrected and controlled by means of electrical means, thereby allowing the electrical correction of the ripple in the discharging pressure without replacing the cam, and that the magnitude of pulsation may be suitably controlled within a desired range.

Claims (1)

  1. Pulsationsfreie volumetrische Pumpe, bei der zwei Plunger (10, 10) durch einen Nocken (12) angetrieben werden, um ein kombiniertes Fördervolumen durch die Pumpaktion der beiden Plunger (10, 10) vorzusehen, bei der ein Antriebsmotor (40) mit dem Nocken (12) in Verbindung steht und bei der eine Schaltung (44, 46, 48) für den Antriebsmotor (40) zum Steuern der Drehzahl vorgesehen ist und einen Schaltkreis (44) zum Einstellen der Drehzahl, einen Hauptverstärker (46) und einen Tachogenerator (48) zum Rückkoppeln eines Ausgangssignales des Antriebsmotors (40) zum Hauptverstärker vorgesehen ist, dadurch gekennzeichnet, daß der Antriebsmotor (40) ein Gleichstrommotor mit einer mechanischen Zeitkonstante unter 12 Millisekunden ist, daß die volumetrische Pumpe ferner einen weiteren Schaltkreis zum Detektieren eines Druckes des kombinierten Fördervolumens und zum Korrigieren eines Steuersignales des Drehzahlsteuerkreises aufgrund des detektierten Signales umfaßt und daß der weitere Schaltkreis umfaßt einen an ein Rohr (32) angeschlossenen Druckdetektor (34), wobei das Rohr das kombinierte Fördervolumen aufgrund der Pumpaktion der beiden Plunger (10, 10) ableitet, einen Schaltkreis (36) zum Eliminieren eines Gleichstromanteiles aus dem Ausgangssignal des Druckdetektors (34) und einen Verstärkerschaltkreis (38), wobei ein Signal vom Verstärkerschaltkreis (38) in eine umgekehrte Phase gewandelt und einem Signal vom Drehzahleinstellschaltkreis (44) zwecks Korrigierung zugefügt wird.
EP19810108256 1980-10-18 1981-10-13 Pulsationsfreie Messpumpe Expired EP0050296B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14507480A JPS5770975A (en) 1980-10-18 1980-10-18 Non-pulsation metering pump
JP145074/80 1980-10-18

Publications (2)

Publication Number Publication Date
EP0050296A1 EP0050296A1 (de) 1982-04-28
EP0050296B1 true EP0050296B1 (de) 1985-06-05

Family

ID=15376772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810108256 Expired EP0050296B1 (de) 1980-10-18 1981-10-13 Pulsationsfreie Messpumpe

Country Status (5)

Country Link
EP (1) EP0050296B1 (de)
JP (1) JPS5770975A (de)
CA (1) CA1181509A (de)
DE (1) DE3170869D1 (de)
MX (1) MX154463A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7770697B2 (en) 2005-02-25 2010-08-10 Mitsubishi Heavy Industries, Ltd. Energy recovering method and system in hydraulic lift device of battery operated industrial trucks

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180467A (en) * 1985-09-18 1987-04-01 Philips Electronic Associated Liquid chromatograph
GB2195473B (en) * 1986-09-17 1990-08-15 Philips Electronic Associated Liquid chromatograph
US4753581A (en) * 1987-02-10 1988-06-28 Milton Roy Company Constant suction pump for high performance liquid chromatography
JP2559414B2 (ja) * 1987-07-10 1996-12-04 株式会社日立製作所 無脈動ポンプの制御装置
JP2745526B2 (ja) * 1988-03-28 1998-04-28 株式会社島津製作所 往復動型送液ポンプ
US5971714A (en) * 1996-05-29 1999-10-26 Graco Inc Electronic CAM compensation of pressure change of servo controlled pumps
JP2001207951A (ja) * 1999-11-16 2001-08-03 Reika Kogyo Kk 定量ポンプ装置
JP4626270B2 (ja) * 2004-11-01 2011-02-02 株式会社島津製作所 送液装置
JP4575844B2 (ja) * 2005-06-03 2010-11-04 株式会社デンソー 回転機械
GB2481624A (en) * 2010-07-01 2012-01-04 Agilent Technologies Inc Controller and piezoelectric actuator provides pressure ripple compensation in chromatographic pump drive

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131393A (en) * 1977-01-21 1978-12-26 Altex Scientific, Inc. Fluid pump mechanism
DE2737062B1 (de) * 1977-08-17 1979-03-29 Zumtobel Kg Schubkolbenpumpe zur pulsationsfreien Foerderung einer Fluessigkeit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7770697B2 (en) 2005-02-25 2010-08-10 Mitsubishi Heavy Industries, Ltd. Energy recovering method and system in hydraulic lift device of battery operated industrial trucks

Also Published As

Publication number Publication date
CA1181509A (en) 1985-01-22
EP0050296A1 (de) 1982-04-28
MX154463A (es) 1987-08-28
DE3170869D1 (en) 1985-07-11
JPS5770975A (en) 1982-05-01
JPS6343591B2 (de) 1988-08-31

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