EP0050296B1 - Pompe volumétrique sans pulsation - Google Patents
Pompe volumétrique sans pulsation Download PDFInfo
- 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
Links
- 238000005086 pumping Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 description 10
- 230000010349 pulsation Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Claims (1)
- Pompe volumétrique à va et vient sans pulsation dans laquelle deux pistons (10, 10) sont animés d'un mouvement de va et vient par l'intermédiaire d'une came (12) afin d'obtenir un volume de décharge combiné par effet de pompage desdits pistons (10, 10) et dans laquelle un moteur de commande (40) est relié à ladite came (12), un circuit (44, 46, 48) est relié audit moteur de commande (40) pour commander le taux de rotation et comprend un circuit (44) pour règler le taux de rotation, un amplificateur principal (46) et un tachogénérateur (48) pour renvoyer un signal de sortie du moteur de commande (40) audit amplificateur principal (46), caractérisé en ce que ledit moteur de commande (40) comprend un moteur à courant continu à constante de temps inférieure à 12 msec et en ce que ladite pompe volumétrique comprend, en outre, un autre circuit pour détecter une pression dudit volume de décharge combiné et pour corriger un signal de commande dudit circuit de commande de rotation par l'intermédiaire du signal détecté, ledit autre circuit comprenant un détecteur de pression (34) relié à un conduit (32) qui fournit le volume de décharge combiné par l'effet de pompage desdits deux pistons (10, 10), un circuit (36) pour éliminer une partie de courant continu du signal de sortie dudit détecteur de pression (34) et un circuit d'amplification (38), un signal à partir dudit circuit d'amplification (38) étant converti selon une phase inverse et ajouté à un signal à partir dudit circuit de réglage de rotation (44) pour la correction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP145074/80 | 1980-10-18 | ||
JP14507480A JPS5770975A (en) | 1980-10-18 | 1980-10-18 | Non-pulsation metering pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0050296A1 EP0050296A1 (fr) | 1982-04-28 |
EP0050296B1 true EP0050296B1 (fr) | 1985-06-05 |
Family
ID=15376772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810108256 Expired EP0050296B1 (fr) | 1980-10-18 | 1981-10-13 | Pompe volumétrique sans pulsation |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0050296B1 (fr) |
JP (1) | JPS5770975A (fr) |
CA (1) | CA1181509A (fr) |
DE (1) | DE3170869D1 (fr) |
MX (1) | MX154463A (fr) |
Cited By (1)
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)
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)
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 |
-
1980
- 1980-10-18 JP JP14507480A patent/JPS5770975A/ja active Granted
-
1981
- 1981-10-13 DE DE8181108256T patent/DE3170869D1/de not_active Expired
- 1981-10-13 EP EP19810108256 patent/EP0050296B1/fr not_active Expired
- 1981-10-14 CA CA000387924A patent/CA1181509A/fr not_active Expired
- 1981-10-15 MX MX18967081A patent/MX154463A/es unknown
Cited By (1)
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 |
---|---|
EP0050296A1 (fr) | 1982-04-28 |
MX154463A (es) | 1987-08-28 |
DE3170869D1 (en) | 1985-07-11 |
CA1181509A (fr) | 1985-01-22 |
JPS5770975A (en) | 1982-05-01 |
JPS6343591B2 (fr) | 1988-08-31 |
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