EP3023638B1 - Unité de pompage de liquides alimentaires - Google Patents
Unité de pompage de liquides alimentaires Download PDFInfo
- Publication number
- EP3023638B1 EP3023638B1 EP15003265.4A EP15003265A EP3023638B1 EP 3023638 B1 EP3023638 B1 EP 3023638B1 EP 15003265 A EP15003265 A EP 15003265A EP 3023638 B1 EP3023638 B1 EP 3023638B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pumping unit
- piston
- unit according
- electric motor
- valves
- 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.)
- Active
Links
- 238000005086 pumping Methods 0.000 title claims description 47
- 239000007788 liquid Substances 0.000 title claims description 24
- 230000033001 locomotion Effects 0.000 claims description 29
- 230000009467 reduction Effects 0.000 claims description 10
- 230000002441 reversible effect Effects 0.000 claims description 7
- 235000013305 food Nutrition 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 230000003134 recirculating effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 235000018553 tannin Nutrition 0.000 description 1
- 229920001864 tannin Polymers 0.000 description 1
- 239000001648 tannin Substances 0.000 description 1
- 235000014101 wine Nutrition 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
- 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
-
- 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
- F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
-
- 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
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
-
- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- 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
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/108—Valves characterised by the material
Definitions
- the present invention relates to a pumping unit for alimentary liquids, such as for example wines, musts, distilled products, food oils, fruit juices and pulps, and the like.
- single-cylinder or multiple-cylinder volumetric piston pumps are usually used to move alimentary liquids that do not withstand centrifugal motions and tend to emulsify or alter their physical state or their organoleptic characteristics as a consequence of those transfer operations that are not performed delicately.
- these pumps have one or more chambers that are alternately connected to a suction pipe and to a delivery pipe by means of valves of a different type depending on the liquid to be processed; a piston slides hermetically within each chamber.
- the actuation of the pistons is generally performed by link and rod systems or by crank and slotted link mechanisms which, despite being widely used, have some drawbacks that are not negligible and are substantially tied to the pulsed motion of the piston.
- the piston speed in fact varies for each stroke from a value equal to zero, when the piston is at one end of the chamber, to a maximum value when the piston is halfway along the stroke, and then the speed returns to zero at the end of the stroke.
- flywheel is usually actuated by means of chains of gears that transmit to the flywheel the torque generated by the motor.
- US6079797 discloses a dual action ball screw pump for a vehicular braking system.
- the pump body has an axial bore defining a travel chamber and a pressure chamber. An input port and an output port are formed in the pressure chamber.
- a ball screw is provided in the travel chamber.
- a piston is connected to the ball screw and slidably extends into the pressure chamber as the ball screw is rotated. The piston divides the pressure chamber into an input chamber having a maximum volume and an output chamber having a maximum volume which is less than the maximum of the input chamber.
- EP0309596 discloses a pumping apparatus for delivering liquid at a high pressure, for use in liquid chromatography.
- the pump has two pistons which reciprocate in two chambers.
- the output of the first pump chamber is connected via a valve to the input of the second pump chamber.
- the pistons are driven by ball-screw spindles.
- the stroke volume displaced by the piston is freely adjustable by corresponding control of the angle by which the shaft of the drive motor is rotated during a stroke cycle.
- the control circuitry is operative to reduce the stroke volume when the flow rate which can be selected by user at the user interface is reduced, thus leading to reduced pulsations in the outflow of the pumping apparatus.
- the aim of the invention is to solve the above described drawbacks, by providing a pumping unit, particularly for alimentary liquids, that is capable of providing a pumping action with flow-rates that are as constant as possible, without entailing the use of oil-pressure controlled systems or of kinematic chains formed by gears in an oil bath.
- a particular object of the invention is to provide a pumping unit that allows to maximize the flow-rate in the presence of an equal diameter of the piston and where said flow-rate can be modified simply and rapidly.
- Another object of the invention is to provide a pumping unit which, for an equal flow-rate, entails a lower number of piston strokes, and therefore of reverse motion, so as to minimize shocks and vibrations and to preserve at the best the organoleptic characteristics of the transferred product.
- Another object of the invention is to provide a pumping unit in which it is possible to predict accurately even from the beginning, the lifespan of the components used.
- a further object of the invention is to provide a pumping unit that avoids the use of the lubricating fluids or lubricants that are normally present in the reduction units that receive the link-and-rod or crank and slotted link systems, and in the pumps operated by oil-pressure controlled cylinders.
- these lubricants may leak and contaminate the place where the pumps are located, the pumps being usually located in environments for processing alimentary liquids.
- Another object of the invention is to provide a pumping unit that is capable of reducing the pulses caused by the alternating operation.
- Another object of the invention is to provide a pumping unit that has no flywheel mass, has a reduced weight and dimensions, and can be installed easily on a truck that can be towed or is self-propelled in order to facilitate its transfers.
- a pumping unit particularly for alimentary liquids, is designated generally by the reference numeral 1.
- the pumping unit 1 includes a base, not shown in the figures, which supports a volumetric pump 2 constituted by a body 3 that is preferably but not necessarily made of stainless steel, in which one or more chambers 4 are defined, also known as cylinders, inside which pistons 5, also known as plungers, hermetically slide.
- a volumetric pump 2 constituted by a body 3 that is preferably but not necessarily made of stainless steel, in which one or more chambers 4 are defined, also known as cylinders, inside which pistons 5, also known as plungers, hermetically slide.
- Figure 1 shows a volumetric pump 2 that comprises a single chamber 4 inside which a single double effect piston 5 slides; however, it is evident to the person skilled in the art that the pumping unit according to the present invention can also support pumps having a different number of pistons, or pumps in which the volume variation is given by the motion of elements of another type.
- the piston 5 comprises a disk-like body that supports on its edge one or more sealing rings 6 that are appropriately made of synthetic material and/or of natural leather treated with tannin.
- the piston 5 is connected to a stem 7 that protrudes from a wall of the body 3 and is able to slide hermetically.
- the chamber 4 is connected alternately to a suction pipe 8 and to a delivery pipe 9, which can be connected respectively to a container for liquid to be transferred and to a receiving container.
- connection of the chamber 4 to the pipes is adjusted by suction valves 10a and 10b and by delivery valves 11a and 11b, which cooperate respectively with seats 12a, 12b and 13a, 13b.
- suction valves 10a and 10b and the delivery valves 11a and 11b automatically open and close respectively upon the increase and decrease of the volume of the chamber 4.
- the suction valves 10a and 10b and the delivery valves 11a and 11b are gravity-actuated ball valves, per se already known, which substantially comprise a metallic core coated with a polymeric material that is suitable for food use.
- the suction valves 10a and 10b and the delivery valves 11a and 11b substantially comprise ground ball screws made of stainless steel.
- the pumping unit 1 is provided with an electromechanical device 14 that is preset to move the piston 5 according to an alternating rectilinear motion.
- the electromechanical device 14 includes a screw drive means 15 which is operatively connected to the piston 5 and is actuated by an electric motor means 16.
- the screw drive means 15 comprises a per se known recirculating ball screw, which is formed by a recirculating ball screw 17 and by a threaded shaft 18.
- the recirculating ball screw 17 is coupled to the free end of the stem 7, while the threaded shaft 18 is connected to the electric motor means 16 by means of a flexible coupling 19, with the possibility to turn in both directions of rotation.
- the electric motor means 16 is arranged substantially in axial alignment with the threaded shaft 18; however, this is merely an example.
- the electric motor means 16 can in fact be mounted in a different position with respect to the threaded shaft 18, using for example reduction units with parallel axes, perpendicular reduction units, or other adequate transmission systems.
- the stem 7 is provided with a longitudinal cavity 20 that is substantially cylindrical and is extended at its axis of symmetry.
- the longitudinal cavity 20 is conceived to receive part of the threaded shaft 18 during the alternating motion of the piston 5.
- the electric motor means 16 is constituted by a variable-speed electric motor, preferably a brushless motor with a low flywheel mass, the operation of which is controlled by an electronic control device 21 by means of which it is possible to set the operation of the pumping unit 1.
- the electronic control device 21 allows to keep the sliding speed of the piston 5 substantially constant.
- the electronic control device 21 allows to associate the time of reverse motion of the piston 5 with the opening/closing time of the suction valves 10a and 10b and of the delivery valves 11a and 11b.
- valves are gravity-actuated, for an equal weight of the balls that in practice constitute the valves, their opening/closing times can be longer or shorter depending on the higher or lower density of the transferred liquid.
- the electronic control device 21 therefore allows to synchronize the flow-rate gap caused by the pulsed motion of the piston 5 with the rising and falling times of said balls.
- a pulse reduction device is mounted on the pumping unit 1.
- the device is constituted by compensation chambers, which are per se known and are not shown in the figures and are arranged on the suction pipe 8 and on the delivery pipe 9.
- the compensation chambers are connected to a pair of piston air generators 22, which supply said chambers so that the volume of air sufficient to ensure their effectiveness is maintained inside them.
- the piston air generators 22 are constituted by single effect pneumatic cylinders with return spring and one-way valves, which are arranged on the outside, at the dead centers of the axial sliding of the stem 7.
- a pusher 23 of appropriate shape which is integral with the stem 7, which upon arriving at the braking steps compresses the air inside the cylinders.
- the entire pumping unit 1 can be mounted on a truck that can be towed or is self-propelled, not shown in the figures, so as to facilitate its transfers in the various regions of use.
- the electromechanical device 114 includes a slider 115 that slides with a rectilinear motion along a linear guide 116 and is fixed to the base that supports the volumetric pump 2 so as to be substantially aligned with the sliding direction of the piston 5.
- the slider 115 is connected kinematically to the stem 7 of the piston 5 and its motion along the linear guide 116 is actuated by a screw drive means 15 which is substantially equivalent to the one already described.
- electromechanical device 14 or 114 allows to guide in the best possible way the piston 5 in its linear alternating motion.
- the rotary motion imparted to the threaded shaft 18 by the electric motor means 16 in fact causes the recirculating ball screw 17 to reach alternately the two opposite ends of the threaded shaft 18.
- the piston 5 sucks the liquid from a part of the chamber 4 through the suction valve 10a, while the delivery valve 11a remains closed, and simultaneously compresses the liquid that is present in the opposite part of the chamber 4, sending it through the delivery valve 11b to the delivery pipe 9.
- volumetric pump 2 The operation of the volumetric pump 2 is different from that of a pump that is actuated in a traditional manner due to greater constancy in the sliding speed of the piston 5 and due to a significant reduction of reverse motion time.
- Reduction of reverse motion time is furthermore facilitated by the absence of flywheel mass and by the management of the electric motor means 16 that is performed by the electronic control device 21 which, as already highlighted previously, allows to synchronize the reverse motion time of the piston 5 with the opening/closing time of the suction valves 10a 10b and of the delivery valves 11a and 11b.
- Another advantageous characteristic of the present pumping unit is constituted by the fact that the electromechanical device 14 or 114 allows to use also pistons/chambers that have a longer stroke and a large bore.
- Another advantageous characteristic of the present pumping unit is constituted by the fact that the electromechanical device 14 or 114 allows to exert forces and strokes that are not available in traditional pumps which, subjected to intense operating pressures, are overloaded to the point of damaging the gears of the reduction unit and the systems for transferring rotary motion into linear motion.
- Another advantageous characteristic of the present pumping unit is constituted by the fact that the electromechanical device 14 or 114 lacks radio transmissions of motion, with consequent reduced wear of the rolling element; however, this does not hinder the possibility of different motion transmissions.
- the electromechanical device 14 or 114 has a very high efficiency, since it uses systems with rolling motions preferably along balls or rollers.
- the electromechanical device 14 or 114 by using preferably brushless motors with a low flywheel mass with electronic position and speed control, allows the present pumping unit to have a constant torque from zero to the maximum rotary speed of the threaded shaft 18, with the consequent possibility to vary the flow-rate of the volumetric pump 2 from zero to the maximum flow-rate at the maximum operating pressure.
- These electronic controls which are an integral part of the present pumping unit, furthermore allow to interface the machine with external electric/electronic control systems, for example for the supply of refrigeration and/or heating circuits.
- a further advantage of the invention resides in that the present pumping unit can be used as a dosage pump; by using an electronic management of the motion of the piston inside the chamber, it is in fact easy to program the exact quantity of cycles in order to dose or mix the transferred liquids in addition to being able to detect, with good approximation, the pumped quantity thereof and the actual partial and/or total operating times; therefore, it also acts as a litre-counter.
- Another advantage of the invention resides in the fact that the present pumping unit can be used to supply filtering systems requiring for example pumps with a small flow-rate with high pumping pressures and self-controlled constant pressures.
- Another advantage of the invention resides in that the motion of the piston is started according to a progressive acceleration ramp until the set speed is reached; this leads to a great advantage during the final filling of tanks and/or of other containers.
- starting process according to an acceleration ramp is advantageous also for the flexible hoses used for transfer.
- the pumping unit particularly for alimentary liquids, thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the inventive concept; all the details may furthermore be replaced with other technically equivalent elements.
- the materials used may be any according to the requirements and the state of the art.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Reciprocating Pumps (AREA)
Claims (9)
- Unité de pompage pour liquides alimentaires, comprenant une pompe volumétrique (2) dotée d'au moins une chambre (4) à l'intérieur de laquelle un piston (5) coulisse hermétiquement; ladite chambre (4) étant reliée alternativement à un tuyau d'aspiration (8) et à un tuyau de distribution (9) au moyen de soupapes automatiques (10a, 10b, 11a, 11b); ladite unité de pompage (1) comprenant en outre un dispositif électromécanique (114) pour le mouvement alternatif dudit piston (5); ledit dispositif électromécanique (114) étant substantiellement constitué d'un moyen d'entraînement de vis (15) fonctionnellement relié audit piston (5) et actionné par un moyen de moteur électrique (16); ladite unité de pompage (1) étant caractérisée en ce que ledit dispositif électromécanique (114) comprend au moins un coulisseau (115) apte à coulisser sur au moins un guide linéaire (116); ledit coulisseau (115) étant associé audit moyen d'entraînement de vis (15) de manière à interagir avec ledit piston (5).
- Unité de pompage selon la revendication 1, caractérisée en ce que ledit moyen d'entraînement de vis (15) comprend au moins une vis à recirculation de billes (17) et un arbre fileté (18), ledit arbre fileté (18) étant mis en rotation par ledit moyen de moteur électrique (16); ladite vis à recirculation de billes (17) étant associée à une tige (7) reliée audit piston (5).
- Unité de pompage selon la revendication 2, caractérisée en ce que ladite tige (7) comprend une cavité longitudinale (20) substantiellement cylindrique, adaptée pour recevoir au moins une partie dudit arbre fileté (18), pendant le mouvement alternatif dudit piston (5).
- Unité de pompage selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que ledit moyen de moteur électrique (16) comprend au moins un moteur électrique à vitesse variable.
- Unité de pompage selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que ledit moyen de moteur électrique (16) comprend un dispositif de commande électronique (21) pour la commande dudit moteur électrique.
- Unité de pompage selon la revendication 5, caractérisée en ce que ledit dispositif de commande électronique (21) comprend un système pour la synchronisation du temps de mouvement inverse dudit piston (5) avec ledit temps d'ouverture/fermeture desdites soupapes (10a, 10b, 11a, 11b).
- Unité de pompage selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que lesdites soupapes (10a, 10b, 11a, 11b) sont des soupapes à billes actionnées par gravité constituées d'un noyau métallique recouvert d'un matériau polymère approprié pour un usage alimentaire.
- Unité de pompage selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que lesdits sièges d'étanchéité (12a, 12b, 13a, 13b) desdites soupapes (10a, 10b, 11a, 11b) comprennent un noyau métallique associé au corps (3) de ladite pompe volumétrique (2); ledit noyau étant recouvert d'un matériau polymère approprié pour un usage alimentaire.
- Unité de pompage selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que celle-ci comprend un disposition de réduction d'impulsions comprenant au moins une chambre de compensation apte à être reliée au tuyau de distribution (9) ou au tuyau d'aspiration (8) de ladite pompe volumétrique (2); ladite chambre de compensation étant alimentée par au moins un générateur d'air de piston (22) apte à être actionné par le coulissement axial de ladite tige (7) pendant le mouvement alternatif dudit piston (5).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITVI20140297 | 2014-11-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3023638A1 EP3023638A1 (fr) | 2016-05-25 |
EP3023638B1 true EP3023638B1 (fr) | 2020-01-22 |
Family
ID=52355111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15003265.4A Active EP3023638B1 (fr) | 2014-11-17 | 2015-11-17 | Unité de pompage de liquides alimentaires |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3023638B1 (fr) |
ES (1) | ES2787176T3 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201700009231A1 (it) * | 2017-01-27 | 2018-07-27 | Alphasol S P A | Dosatore volumetrico ad alta pressione per il riempimento di contenitori quali ad esempio bombole aerosol attraverso valvole aerosol, valvole con sacchetto denominate BOV (bag on valve), valvole a dosaggio e similari con prodotti liquidi e/o cremosi. |
CN106949032A (zh) * | 2017-05-17 | 2017-07-14 | 广州市欧通机械有限公司 | 一种特种油脂卫生级高压输送泵 |
CN107152387B (zh) * | 2017-06-29 | 2020-05-19 | 中国工程物理研究院总体工程研究所 | 用于活塞冷却喷嘴性能实验台架的定量供油流量调节装置 |
IT201800002800A1 (it) * | 2018-02-19 | 2019-08-19 | Ima Spa | Pompa volumetrica. |
US12049819B2 (en) | 2019-07-08 | 2024-07-30 | Halliburton Energy Services, Inc. | Direct drive for a reservoir fluid pump |
IT202000007915A1 (it) * | 2020-04-15 | 2021-10-15 | Cft Spa | Sistema di pompaggio di fluidi contenenti particelle solide |
US20240036014A1 (en) * | 2022-07-29 | 2024-02-01 | Valco Instruments Company, Inc. | Linear actuator for chromatography |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB622649A (en) * | 1946-03-29 | 1949-05-05 | Self Priming Pump & Eng Co Ltd | A new or improved diaphragm pump |
CH447637A (de) * | 1964-09-18 | 1967-11-30 | Ceskoslovenska Akademie Ved | Vorrichtung zur genauen Dosierung von Flüssigkeiten |
FR2525288B1 (fr) * | 1982-04-19 | 1988-09-16 | Unima Anjou | Dispositif de commande d'une pompe alternative, en particulier pour pulverisateur a usage agricole |
DE3785207T2 (de) * | 1987-09-26 | 1993-07-15 | Hewlett Packard Gmbh | Pumpvorrichtung zur abgabe von fluessigkeit bei hohem druck. |
US6079797A (en) * | 1996-08-16 | 2000-06-27 | Kelsey-Hayes Company | Dual action ball screw pump |
US9739272B2 (en) * | 2012-11-29 | 2017-08-22 | Fair Oaks Farms Brands, Llc | Liquid product dispensing system and method |
-
2015
- 2015-11-17 ES ES15003265T patent/ES2787176T3/es active Active
- 2015-11-17 EP EP15003265.4A patent/EP3023638B1/fr active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
ES2787176T3 (es) | 2020-10-15 |
EP3023638A1 (fr) | 2016-05-25 |
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