EP2010784A1 - Pumpelement und pumpe mit einem solchen pumpelement - Google Patents
Pumpelement und pumpe mit einem solchen pumpelementInfo
- Publication number
- EP2010784A1 EP2010784A1 EP07723635A EP07723635A EP2010784A1 EP 2010784 A1 EP2010784 A1 EP 2010784A1 EP 07723635 A EP07723635 A EP 07723635A EP 07723635 A EP07723635 A EP 07723635A EP 2010784 A1 EP2010784 A1 EP 2010784A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- movable member
- movable
- pumping
- spring
- pump
- 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.)
- Granted
Links
Classifications
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- 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
- F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means
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- 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
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
- F04B17/042—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow
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- 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
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
- F04B17/042—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow
- F04B17/044—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow using solenoids directly actuating the piston
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- 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
- F04B53/12—Valves; Arrangement of valves arranged in or on 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
- F04B7/04—Piston machines or pumps characterised by having positively-driven valving in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports
Definitions
- the present invention relates to a pumping element and a pump having such a pumping element.
- Pumps according to the state of the art are complex structures which contain the fluidic structure, the drive and optionally a control or regulating device.
- a disadvantage of the high complexity of the known pumps are the high production costs, which almost preclude the use of such pumps for single use. Furthermore, in complex structures, the effort to achieve a high reliability increases.
- Embodiments of the present invention provide a pumping element having the following features:
- a pumping element housing defining a pumping chamber
- a flow resistance of a flow path from the first movable element through the inlet is greater than a flow resistance of a flow path between the pump element housing and the first movable element
- a flow resistance of a flow path from the first movable member through the drain is smaller than a flow resistance of the flow path between the pump member housing and the first movable member;
- the inlet during the movement of the first movable Element in the direction from the first to the second position, or at least during most of this movement be closed, for example, by a second movable element.
- a pumping element housing defining a pumping chamber having an inlet and a drain;
- a first movable member movable in the pumping chamber between a first position and a second position, the draining being closed when the first movable member is in the first position;
- a second movable member which is movable in the pumping chamber between a third and a fourth position
- a pump may include a respective pumping element and a drive unit configured to drive the first movable element from the first to the second position and / or to drive the second movable element from the third to the fourth position ,
- Embodiments of the present invention may relate to miniature pumps or micropumps in which a quantity of fluid pumped per pump stroke is in the microliter, nanoliter or picoliter range.
- Exemplary embodiments of the invention can relate to pumping elements or pumps for liquids, for example infusion solutions, lubricants, foods or cleaning agents, wherein the pumping element and the drive unit can be configured separately.
- the pumping element can be produced inexpensively, for example by plastic injection molding, and disposed of after use.
- the drive unit may be reused, in embodiments of the present invention when pumping the drive unit is not in contact with the fluid to be pumped.
- a quantity of fluid pumped can be determined directly from the number of pump strokes.
- the pumping element may have an integrated check valve for controlling the fluid flow.
- the integrated check valve can block fluid flow through the pump element in the non-actuated state of the pump element.
- Embodiments of the pump according to the invention can be used for a variety of applications, in particular in the fields of medicine, process engineering and research.
- An example of this is automatic medicament dosage devices in human medicine.
- fluid transport from an area remote from the drain of the first movable member past the movable member into one on the drain facing side of the first movable element arranged area instead.
- the inlet can be closed in order to be able to achieve the lowest possible return flow through the inlet and an associated suction through the outlet.
- fluid for example a liquid or a gas, can thus be transported past the first movable element.
- fluid to be pumped upon movement of the first movable member in the direction from the second position to the first position, fluid to be pumped is displaced by the first movable member and discharged through the drain. At the same time fluid is sucked through the inlet.
- This movement phase can thus be referred to as transport phase.
- transport phase As a result of alternating transport phases and pumping phases, a net flow can thus take place in the direction from the inlet to the outlet.
- the pumping element may be configured such that upon actuation the second movable element is moved faster from the third to the fourth position than the first element is moved from the first to the second position.
- the second movable member in the fourth position closes the inlet.
- the second spring may have a lower spring constant than the first spring to cause the faster movement of the second movable member.
- separate drive means may be provided for the first movable member and the second movable member.
- a drive device for the second movable element may cause it to move from the third position to the fourth position before a drive device causes the movement of the first movable element from the first to the second position.
- the drive unit and / or the first moveable element and the second moveable element may be configured to exert a greater force on the second moveable element to move faster to the fourth position than the first moveable one Element is moved to the second position.
- Embodiments of the present invention enable the fluidic structure of the pumping element and its drive to be constructed separately from each other.
- the actual pumping element can consist of a few components and can be produced, for example, inexpensively by plastic injection molding.
- Embodiments of the present invention allow the pumping element to be disposed of after use so that disposable applications are economically possible.
- the more expensive drive unit which may include a controller, may be used for multiple pumping elements or over multiple pumping element life cycles.
- the pumping element that is, the fluidic element that comes into contact with the fluid to be pumped, be replaced without having to replace the more expensive drive unit.
- a pumping function may be performed by two metallic moving elements, for example balls or pistons, housed in a pumping chamber,. which can also be referred to as a channel, are held by two springs in a defined position.
- the first movable element closes the outlet from the pumping chamber, while the second movable element can release the inlet to the pumping chamber, which can be connected to a reservoir for a fluid to be pumped, wherein the pumping chamber is filled by the inlet with the fluid.
- the movable elements by one or more integrated in the drive unit coils, the movable elements can be moved by a magnetic force against the spring force in the second and fourth position.
- the second movable element firstly closes the inlet while the first movable element releases the drain and the fluid, liquid or gas contained in the pumping chamber is pushed past the first movable element (transport phase).
- the spring pushes back the first movable element, whereby fluid located in front of the first movable element is at least partially conveyed through the backflow.
- a leakage current arises through the gap between the movable element and the pressure chamber wall through which a certain amount of liquid can flow back during the pumping movement.
- the magnitude of the leakage current is determined by the gap width between the first movable element and the pumping chamber wall, ie the flow resistance of the flow path between the first movable element and the pumping chamber wall.
- the first movable element At the end of the pumping movement seals in embodiments of the invention, the first movable element from the process again.
- the second movable element opens in embodiments of the invention, approximately at the same time the inlet, whereby the housing refills.
- About number and speed of Pump strokes can be controlled while the metered flow.
- the pump can block fluid flow without leakage.
- pumping elements with different flow rates can be realized by the pump design.
- the cross section of the fluidic structure, i. the pumping chamber channel thereof, the length of the pumping stroke and the size of the gap between the movable member and the channel wall are adjusted to adjust the amount of fluid delivered per pump stroke.
- pumping elements with different flow rates can be driven with the same drive unit.
- Embodiments of the present invention also advantageously allow a pump to be implemented without much overhead with a monitoring device that can check the position of the pump, i. which can determine the position of the first movable element and / or, if present, the position of the second movable element.
- the drive unit may comprise a drive coil, wherein in the drive unit, a further measuring coil can be integrated. By generating a superimposed alternating magnetic field through the drive coil, a voltage in the additional measuring coil can be induced. The induced voltage is dependent on the position of the movable element (s) whose material has a permeability.
- the position of the pumping element can be determined by a suitable measuring device, whereby a function monitoring of the pump is made possible.
- Ia and Ib are schematic sectional views of an embodiment of a pump according to the invention.
- FIGS. 2 and 3 are schematic cross-sectional views of embodiments for explaining a flow path between pumping element housings and first movable elements;
- FIGS. 4 and 5 are schematic representations of embodiments that allow a variable flow resistance of the flow path between a pump element housing and a first movable member.
- 6a and 6b are schematic sectional views for explaining a further embodiment of a pump according to the invention.
- FIG. 10 is a schematic sectional view of an embodiment of a pumping element according to the invention.
- FIG. 1a shows a sectional view of an embodiment of a pump according to the invention in a rest state and FIG. 1b shows the pump in an actuated state.
- the pump comprises a pumping element 10 and a drive unit 12.
- the pumping element 10 comprises a pumping element housing 14 and the drive unit 12 comprises a drive unit housing 16.
- the pumping element housing 14 and the drive unit housing 16 are constructed as separate housings. such that they can be coupled together and separated from each other. Suitable devices by means of which the drive unit housing 16 can be reversibly coupled to the pump element housing 14 will be apparent to those skilled in the art and include, for example, snap connections, threaded connections, hooks, clips, hook and loop fasteners, and the like, and need not be further explained herein.
- the pump element housing 14 defines a pumping chamber 18, an inlet 20 and a drain 22.
- the pumping element housing 14 can be realized inexpensively, for example, by plastic injection molding, whereby the inlet 20 and the outlet 22 can be injection-molded.
- a first ball 24, which represents a first movable element and a second ball 26, which represents a second movable element.
- a spring 28 Between the balls 24 and 26 is a spring 28.
- a second spring 30 Between the second ball 26 and the pump element housing 14 is a second spring 30.
- the first spring 28 and the second spring 30 are formed as spiral springs.
- the first ball 24 is positioned by the spring assembly such that the drain 22 is closed with the first ball 24 held in that position by the first spring 28.
- the second ball 26 is positioned by the spring arrangement so that the inlet 20 is opened and the pumping chamber 18 is filled in the housing 14 with fluid or is.
- the inlet 20 may be connected via suitable fluid lines to a fluid reservoir (not shown), while the outlet 22 may be connected via suitable fluid lines to a target area (not shown).
- the inlet 20 and the outlet 22 may have luer connector structures 32, for example.
- a further spring 34 may be provided, for example in the form of a leaf spring, which presses the first ball 24 onto a sealing seat formed by the drain 22.
- the leaf spring 34 generates a force perpendicular to the force generated by the springs 28 and 30.
- the balls 12 may be formed, for example, as metallic balls, while the springs may be performed, for example, non-magnetic non-ferrous metal.
- the drive unit 12 comprises one or more drive coils 40 as an electromagnetic drive for the metallic ball 24, which surround a ferromagnetic core 42.
- the ferromagnetic core 42 may also be in the form of a yoke with suitable pole pieces at the positions of the movable members, thereby greatly improving the magnetic flux return, as will be described later with reference to FIGS. 5-7 is explained.
- the drive unit 12 further includes a controller 44 coupled to the drive coil (s) 40 for selectively and cyclically impressing current through the one or more coils 40 to thereby generate an electromagnetic force acting on the metallic balls 24 and 26 ,
- the second ball 26 Due to the generated electromagnetic force, the second ball 26 is moved against the force of the second spring 30 in the direction of the inlet 20, so that the inlet 20 is sealed, as shown in Fig. Ib.
- the magnetic force on the ball 24 can be increased as long as the ferromagnetic core 42 and, if present, a yoke are not yet in the magnetic field Saturation is located.
- it In order to move the second ball 26 from the rest position shown in Fig. Ia to the sealing position shown in Fig. Ib, it must be moved by a distance S 2 . For this a magnetic force F magnet (s 2 ) is necessary.
- the bias of the springs F VO r can be adjusted so that the first ball 24 does not move until the second ball 26 has sealed the inlet 20.
- it In order finally to bring the first ball 24 against the force of the first spring 28 with the spring constant Ci in the position shown in Fig. Ib, it must be moved by a distance Si.
- the outlet 22 is opened and the fluid flows laterally during the movement of the second ball 24, ie flows through a flow path between the first ball 24 and the pump element housing 14.
- the flow force F flow depends essentially on the gap width of the gap the second ball 24 and the pump element housing 14 and from the speed v at which the first ball 24 moves.
- Figs. Ia and Ib The spring constants and spring preloads of the springs 14 and 17 can thus preferably be chosen so that after switching on the magnetic force first the ball 26 is moved and seals the inlet 20 before the ball 24 moves through the fluid and the drain 22 releases. If the magnetic force is turned off, then both balls can move virtually simultaneously, inter alia, because the spring 30 is supported by the inflowing through the inlet 20 fluid.
- the second ball 26 may have a slightly smaller diameter than the first ball 24.
- Fig. 2 shows schematically a cross-sectional view along the line II-II in Fig.
- the gap width of the annular gap can preferably be significantly smaller than the diameter and depend on the diameter of the ball. For example, depending on the diameter of the sphere, the gap width may be less than 100 ⁇ m, less than 50 ⁇ m or less than 20 ⁇ m.
- the ball is shown centered, with the position actually being able to deviate from the position shown, depending on the circumstances, that is to say the orientation, for example, so that no gap is arranged on one side of the ball.
- FIG. 1 A schematic cross-sectional view of an alternative embodiment having a pumping element housing 14a having a round pumping chamber cross-section is shown in FIG.
- a cylinder-piston-shaped movable element 24a in this case has one or more channels 46a, which result in one or more flow paths between the movable element 24a and the pump element housing 14a, as can be seen in FIG.
- four channels 46a are shown in FIG. 3, in alternative embodiments, a different number of channels, for example only one channel, may be provided.
- Fig. Ib shows this arrangement of the pump in action of a magnetic force from magnet F ⁇ F Ma g net (Si).
- the control device 44 is designed to supply the drive coil 40 with such a current that a corresponding magnetic force is exerted on the first ball 24.
- Actuation of the drive unit 12 thus effects a movement of the balls 24 and 26 from the positions shown in FIG. 1 a to the positions shown in FIG. 1 b.
- the ball 24 is moved away from the outlet 22 in the pumping chamber 18, whereby fluid is transported from a side of the ball 24 facing away from the outlet 22 to a side of the ball facing the outlet 22, along the flow path 46 or 46a. as shown for example in Figs. 2 and 3.
- the ball 24 presses the fluid out of the pumping chamber 18 through the outlet 22 due to the force of the first spring 28, whereupon the Ball 24 finally seals the drain 22 again.
- the second ball 26 releases the inlet 20, so that again new fluid can flow through the inlet 20 into the pumping chamber.
- the balls 24 and 26 again assume the positions shown in Fig. Ia by the bias of the springs 28 and 30.
- the drive unit can then be actuated again, so that a defined volume of fluid can be pumped by a cyclical actuation of the drive unit by carrying out a specific number of pump cycles per known stroke per pump stroke.
- the volume pumped is given by the geometry, in particular by the size of the ball 24, the size of the pump stroke (ie the distance Si of movement of the ball 24) and the size of the flow gap 46 between the ball 24 and the pump element housing 14 Adjusting the geometry, therefore, the volume pumped per pump stroke can be adjusted. Based on the number of pump strokes, the volume delivered can be determined.
- the ratio between the amount of fluid pumped off for example the amount of liquid and the amount of fluid that has flowed back through the gap 46 during the pumping movement of the ball 24, is as large as possible.
- Fig. 4 shows a schematic representation of a pump element housing 14b, in which a movable element 24b is arranged.
- the cross-section of a pump chamber 18a formed in the pumping element housing 14b may, for example, be circular, wherein the movable element 24b may be cylinder-piston-shaped, so that a flow gap 46b is formed between the inner wall of the pump element housing 14b and the movable element 24b.
- the movable member 24b has a seal member 50 fixed thereto and changing a flow resistance for a fluid to be pumped between the movable member 24b and the passage wall of the pump chamber housing 14b depending on the direction of movement.
- the sealing element 50 is designed as a limp and is suitable, for example, to be connected only via a pin 52 with the movable element 24b.
- the sealing element 50 thus provides for a movement of the movable member 24b in Fig. 4 to the right for a flowing fluid lower flow resistance than in a movement of the movable lent element 24b in Fig. 4 to the left.
- the sealing element offers greater flexibility when moving to the right, since it can be deflected away from the movable element 24b, while it is pressed against the same during a movement of the movable element 24b towards the same.
- the movable element here has an additional valve function.
- the additional sealing element 50 can be made of any elastic material, for example rubber, which changes its fluidically effective geometry depending on the direction of movement of the movable element 24b and thus allows a change in the flow resistance in order to be able to produce a desired valve function in this way.
- FIG. Fig. 5 again shows schematically a pumping element housing 14c and a movable element 24c arranged therein. Furthermore, pole shoes 56 and 58 of a magnetic drive unit are shown schematically in FIG.
- the movable element 24c is designed such that, depending on its position and position in the flow channel, ie in the pump channel 18b formed in the pump element housing 14c, a different flow resistance of a fluidically active gap 46c is produced.
- this can be achieved by superimposing a translatory movement 60 of the movable element 24c through a rotational movement, by means of which the fluidic gap 46c increases or decreases, so that different flow resistances are produced.
- the element 24c may be a ball flattened on two or more sides, which may rotate about its central axis.
- the movable member 24 c may be made of a permanent magnetic material, so that a rotation of the movable member 24 c takes place when it is moved by the translational movement 60 between the pole pieces 56 and 58, as indicated by dashed lines in Fig. 5.
- the cross section of the gap 46c may decrease during the pumping movement of the movable element 46c in the direction of the pump outlet and move away in the direction of the pump outlet during the loading movement. larger, whereby a dynamic valve effect can be achieved.
- FIGS. 6a and 6b show a further embodiment of a pump according to the invention, which represents a modification of the embodiment shown in Figs. Ia and Ib, with an explanation and description of the elements and functionalities already described with reference to Figs. Ia and Ib is waived.
- a drive unit 12a differs from the embodiment described with reference to FIGS. 1a and 1b in that a detection device is provided for determining a position of the balls.
- This detection device comprises a detection coil 70 and a detection device 72.
- the detection device 72 can be integrated into the control device 44 or can be provided separately therefrom.
- the detection device 72 is coupled to the detection coil 70 and may be further coupled to the drive coil 40.
- Either the control device 44 or the detection device 72 are designed to send such a changing current through the drive coil 40 that a changing magnetic field, for example a magnetic alternating field, is superimposed, the change of which a voltage U ind in the detection coil 70 induced. Due to the permeability of the material of the balls 24 and 26, this voltage also changes depending on the position of the balls in the pumping element.
- the detection device 72 is designed to detect the voltage U ind and to evaluate changes thereof in order to draw conclusions about the position of the balls in the pump element. Thus, the position of the balls 24 and 26 within the pumping 10 so that the position and function of the pumping element can be monitored. In such an embodiment, it is again possible to amplify the measurement signal which is represented by the voltage induced in the coil 70 by means of a magnetic yoke in the form of a yoke and pole shoes positioned thereon.
- FIGS. 7 to 8 each show a pumping element which has a pumping element housing 80 in which a pumping chamber 82, an inlet 84 and a drain 86 are formed.
- a first movable ball 88 and a second movable ball 90 are arranged, which are biased by a first spring 92 and a second spring 94 in the positions shown.
- the drive units 102a and 102b can have a similar structure, wherein respective features of the drive unit 102a are identified by the letter "a", while features of the drive unit 102b are identified by the letter "b X ⁇ .”
- the drive units have drive unit housing parts 104a and 104b
- the drive unit 102a has one or more drive coils 106a and one or more detection coils 108a
- the drive unit 102b has one or more drive coils 106b.
- the drive unit 102a has a control device 44a and a detection device 72.
- the drive unit 102b also has a control device 44b and can be used optimally. Further, also one or more detection coils and a detection device.
- the drive coils 106a and 108a are wound around a ferromagnetic yoke 110a
- the drive coils 106b are wound around a ferromagnetic yoke 110b.
- Pole shoes 112a and 114a which guide the magnetic flux such that the ball 88 is pulled between the pole pieces 112a and 112b when actuated, are attached to the ferromagnetic yoke 110a.
- Pole shoes 112b and 114b are also attached to the yoke 110b, which guide the magnetic flux such that in the actuated state the ball 90 is pulled between the pole shoes 112b and 114b.
- the movable elements in the illustrated embodiments, balls 88 and 90 can be part of the magnetic circuit see, whereby the acting magnetic forces can be significantly larger. Furthermore, the measurement signal induced in the detection coil 108a and detected by the detection device 72 can thereby be significantly stronger.
- the structural design of the yokes and pole shoes depends on the particular design of the pumping element. It should be noted at this point that the geometric configuration of the pumping elements shown in the exemplary embodiments is purely exemplary for illustrative purposes. Furthermore, it should be noted that the inlets and outlets can be arranged at a suitable position, wherein, in particular, the position of the inlet in FIGS. 7 and 8 is purely schematic and, of course, at a suitable location to allow inward flow of a fluid, ie a liquid or liquid of a gas to allow into the pumping chamber.
- the functionality of the embodiment shown in FIG. 7 may substantially correspond to the functionality of the embodiment described above with reference to FIGS. 1a and 1b.
- the spring constants of the springs 92 and 94, the timing of impressing a current into the drive coils 106a and 106b, and / or the magnitude of the current impressed into the drive coils 106a and 106b (and the magnetic field generated thereby) may be adjusted to cause the ball 90 to close the inlet 84 upon actuation before the ball 88 is moved from the position shown to the actuated position.
- the drive unit 120 has a drive unit housing 122, which in turn is reversibly coupled to the pumping element.
- the drive unit further comprises a control device 44 and a detection device 72 which, in analogy to the above descriptions, are coupled to one or more drive coils 106 and one or more detection coils 108.
- the drive coil 106 and the detection coil 108 are wound around a yoke 110, which may be made of a ferromagnetic material, as shown.
- the yoke 110 has first pole shoes 124 and 126 for guiding the magnetic flux for actuating the first ball 88 and second pole shoes 128 and 130 for conducting the magnetic flux for actuating the second ball 90.
- FIG. 8 An alternative embodiment of a drive unit 140 for actuating both balls 88 and 90 is shown in FIG.
- the drive unit 140 comprises a drive unit housing 142, in which in turn a control device 44, a detection device 72, one or more drive coils 106 and one or more detection coils 108 are arranged. As shown in the embodiments shown in FIG.
- the drive coil 106 and the detection coil 108 are provided on a yoke 144 disposed between pole pieces 124, 126, 128, and 130.
- the embodiment shown in Figure 9, therefore, allows a very compact design of the drive unit, which in turn is reversibly coupled to the pump element housing.
- the pumping element 150 comprises a pumping element housing 152 in which in turn a pumping chamber 154, an inlet 156 and a drain 158 are formed.
- the pumping element 150 also has a first ball 160, a second ball 162, a first spring 164 and a second spring 166. Between the springs, a spring stop 168 is arranged. The springs 164 and 166 bias the balls 160 and 162 to the position shown in FIG.
- the ball 160 can be moved away from the drain 158 against the force of the spring 164 to open it and to transport fluid past it while the inlet 156 passes through the ball 162 closed is.
- pole shoes can in turn be displaced somewhat from the ball 160 in the direction of the inlet 156.
- the spring 164 drives the ball back to the position shown in FIG. 10, wherein fluid is expelled from the drain 158.
- the cou- Gel 162 forms together with the spring 166 thereby a check valve, which allows a running of fluid through the inlet 156.
- the spring 166, the ball 162 and the sealing seat on the inlet 156 may in this case be coordinated so that the non-return valve formed thereby opens in the direction of passage immediately when the ball 160 is in the pumping movement to the outlet 158 out, and in Locking closes immediately when the ball 160 is in the loading movement of the expiration 158 away.
- the spring 164 together with the ball 160 thus forms the pump drive
- the spring 164 and the sealing seat of the ball 160 and the pump housing 152 and the drain 158 can be adjusted by the same so that the Drain 158 is reliably sealed by the element 160 as long as the magnetic drive is switched off, ie as long as the system is at rest.
- a quiescent flow from the inlet 156 through the outlet 158 can also be effectively prevented, just as a return flow from the outlet 158 back to the inlet 156.
- the springs 164 and 166 are decoupled and are based on a fixed stop 168.
- the two spring forces are determined solely by the distance between the ball 160 and the spring stop 168 or between the ball 162 and the spring stop 168 and are thus completely decoupled from each other.
- an additional magnetic drive could be provided for the ball 162 which is controllable independently of the magnetic drive for the ball 160.
- embodiments of the present invention thus provide a pump for fluids having a first th housing and with an inlet and a drain and a second housing which can be mechanically releasably connected to the first housing.
- the first housing may include a first movable member and at least one first spring, the first spring defining the first movable member in a position that seals the drain.
- the housing may include a second moveable element and at least one second spring, wherein the second spring defines the second moveable element in a position that releases the inlet.
- the second housing may include at least one coil, a ferromagnetic core, and a controller for generating a magnetic field and thereby defining the movable members against the acting force of the springs in a second position, the inlet being sealed by the second movable member and the flow is released by the first movable element.
- the movable elements can be returned to the rest position by the springs, so that fluid contained in the first housing is at least partially conveyed out of the drain.
- Embodiments of the present application comprise, as described above, two movable elements.
- both movable elements can be actuated by a drive unit.
- only the first movable element is drivable by a drive unit, while the other movable element can be effective as a check valve and is driven substantially only by an inflowing fluid.
- the inlet could also be provided with a conventional check valve, for example a flap valve, which is in the pumping movement of the first movable element opens the inlet and during the transport movement, with the fluid past the first movable element is transported, closes the inlet.
- the inlet need not be provided with a valve, as long as the flow resistance of the first movable element through the inlet is greater than the flow resistance between the first movable element and the inner pumping element housing wall, since in such a case still a net pumping effect can be effected by the process.
- Housing parts of the pump element housing may advantageously consist of plastic and be produced, for example, using the injection molding technique.
- the housing parts may also be made using other suitable materials, for example by microstructuring techniques using semiconductor or ceramic materials or non-ferromagnetic metals.
- the one or more movable elements may advantageously be made of a ferromagnetic, soft magnetic or permanent magnetic material.
- the first movable element may be permanently magnetic and designed as a magnetic dipole, wherein the magnetic axis of the dipole is oriented so that the movable element upon application of an external magnetic field generated by a drive unit in addition to the translational or a rotational
- the first movable element is positioned in the pump element housing in such a way that its fluidically effective geometry is changed in the sense of a valve, as was explained above with reference to FIG. 5.
- Described embodiments of the present invention include movable members that are in the form of a ball or a piston.
- the movable element may have any shapes that provide the functionality described in conjunction with a corresponding pumping element housing.
- a further sealing element which can be made of an elastic material and changes its fluidically effective geometry as a function of the direction of movement of the movable element, can be fastened to the movable element, wherein the movable element is in connection with the sealing element has a valve function with the aid of which the ratio of pumped amount of fluid and the amount of fluid that has flowed back during the pumping movement through the flow path between the movable element and the pump element housing can be increased.
- the springs biasing the first movable member in position and / or the second movable member to the third position may be made of any suitable material, such as non-magnetic non-ferrous metal.
- the drive unit is designed in a separate housing such that it can be placed on different pump element housings, so that a plurality of pump types can be controlled with one drive unit.
- the rate of delivery of the pump during operation may be adjusted by changing the pumping frequency or by varying the pumping stroke of the first movable element.
- the pump frequency may be adjusted in embodiments of the invention by changing the frequency at which a current is impressed into the drive coil by the controller.
- the pumping stroke of the first movable member may be varied by changing the impressed current and thereby changing the generated magnetic force.
- the delivery rate may be varied by varying the gaps between the first movable member and the pumping element housing and varying the spring preload F be set before, for example, in advance in the design of the pump.
- a defined amount of fluid is pumped per pump stroke.
- a correspondingly necessary number of pumping strokes can thus be counted and carried out.
- the magnetic flux can be directed into the movable element or elements in a targeted manner via a ferromagnetic yoke and ferromagnetic pole shoes attached thereto.
- the magnetic flux through the balls can be adjusted in a targeted manner.
- a magnetic drive can be made up of two substantially identical units, each unit having its own control device and thus being able to control one of the movable elements individually.
- the magnetic drive may consist of one unit, wherein a magnetic flux is simultaneously introduced into both movable elements via a ferromagnetic yoke and pole shoes.
- the magnetic drive may consist of a unit, wherein a ferromagnetic yoke is made in two parts with pole shoes attached thereto, the drive coils being mounted in the region between the two movable elements on the yoke.
- the second housing having the drive unit may comprise a further coil and a detection device in which an alternating magnetic field is superimposed on the drive coil which is in the further coil a voltage is induced, which is measured and evaluated by the detection device, wherein the induced voltage in the further coil depends on the position of the movable elements in the pump element housing and wherein the detection device determines the position of the movable elements and thus the position and determine the function of the pump.
- the first movable member closes the drain when in the first position
- the drain may not be completely closed when the first movable member is in the first position, still one Net pumping effect can be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Reciprocating Pumps (AREA)
- Electromagnetic Pumps, Or The Like (AREA)
- Details Of Reciprocating Pumps (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202006010726 | 2006-07-05 | ||
PCT/EP2007/002689 WO2008003359A1 (de) | 2006-07-05 | 2007-03-27 | Pumpelement und pumpe mit einem solchen pumpelement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2010784A1 true EP2010784A1 (de) | 2009-01-07 |
EP2010784B1 EP2010784B1 (de) | 2009-09-30 |
Family
ID=38806174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07723635A Not-in-force EP2010784B1 (de) | 2006-07-05 | 2007-03-27 | Pumpelement und pumpe mit einem solchen pumpelement |
Country Status (12)
Country | Link |
---|---|
US (1) | US8241019B2 (de) |
EP (1) | EP2010784B1 (de) |
JP (1) | JP2009541647A (de) |
CN (1) | CN101484700B (de) |
AT (1) | ATE444444T1 (de) |
BR (1) | BRPI0712630A2 (de) |
CA (1) | CA2656624C (de) |
DE (2) | DE102007014688A1 (de) |
ES (1) | ES2333178T3 (de) |
MX (1) | MX2008015894A (de) |
RU (1) | RU2397365C1 (de) |
WO (1) | WO2008003359A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PT2161745E (pt) * | 2008-09-08 | 2012-10-29 | Converteam Technology Ltd | Unidades de empilhamento contendo dispositivos semicondutores |
BR112013028508A2 (pt) * | 2011-05-06 | 2017-12-05 | Electrolux Home Products Corp Nv | conjunto de bomba de pistão para distribuição de líquidos, aparelho doméstico |
DE102011111926A1 (de) * | 2011-08-31 | 2013-02-28 | Thomas Magnete Gmbh | Elektromegnetische Pumpe |
US8991649B2 (en) | 2012-01-05 | 2015-03-31 | Gojo Industries, Inc. | Keyed dispensing systems and related methods |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1144142A (en) * | 1965-03-13 | 1969-03-05 | Walter Eberspacher | Reciprocating fuel pump, particularly for oil-fired furnaces |
AU446929B2 (en) | 1972-11-07 | 1974-04-04 | Gunweb Limited | Direct drive ball piston compressor |
US3841798A (en) * | 1973-03-01 | 1974-10-15 | Odell Mfg Inc | Electromagnetic self-priming pump |
JPS54127609U (de) * | 1977-07-28 | 1979-09-05 | ||
JPH0341098Y2 (de) * | 1980-12-29 | 1991-08-29 | ||
DE3233240A1 (de) | 1982-09-04 | 1984-03-08 | Max Prof. Dr.-Ing. 8520 Erlangen Schaldach | Kolbenpumpe |
US4599054A (en) * | 1984-08-23 | 1986-07-08 | Spears Harry L | Travelling valve assembly for a fluid pump |
DE3707764C1 (de) | 1987-03-11 | 1988-04-28 | Eberspaecher J | Durch einen Elektromagneten betaetigte Brennstoffkolbenpumpe |
JPH0337288U (de) | 1989-08-23 | 1991-04-11 | ||
US5346369A (en) * | 1993-12-16 | 1994-09-13 | Miller Jr William L | Bilge pump actuated by wave motion |
JPH08114178A (ja) * | 1994-10-17 | 1996-05-07 | Toyo Ink Mfg Co Ltd | 可逆パルスポンプ |
JP2000199477A (ja) * | 1998-12-28 | 2000-07-18 | Furukawa Co Ltd | ダブルピストンポンプ |
JP2000220570A (ja) * | 1999-01-28 | 2000-08-08 | Tokico Ltd | プランジャポンプおよびこれを用いたブレーキ装置 |
CN1133810C (zh) * | 2001-02-16 | 2004-01-07 | 郗大光 | 电动燃油喷射装置 |
US7107837B2 (en) * | 2002-01-22 | 2006-09-19 | Baxter International Inc. | Capacitance fluid volume measurement |
ATE484677T1 (de) * | 2002-11-01 | 2010-10-15 | Danfoss As | Kolbenflüssigkeitspumpe zur zufuhr von flüssigem brennstoff zueiner haushalts-brennervorrichtung |
JP2005054721A (ja) * | 2003-08-06 | 2005-03-03 | Taisan Kogyo Kk | 電磁ポンプ装置 |
US7651015B2 (en) * | 2004-02-13 | 2010-01-26 | Intelligent Coffee Company, Llc | Liquid concentrate/extract beverage dispenser with replaceable concentrate/extract cartridge |
US7594525B2 (en) | 2004-02-13 | 2009-09-29 | Intelligent Coffee Company, Llc | Replaceable concentrate/extract cartridge for a liquid concentrate/extract beverage dispenser |
-
2007
- 2007-03-27 DE DE102007014688A patent/DE102007014688A1/de not_active Withdrawn
- 2007-03-27 CN CN2007800255210A patent/CN101484700B/zh not_active Expired - Fee Related
- 2007-03-27 ES ES07723635T patent/ES2333178T3/es active Active
- 2007-03-27 WO PCT/EP2007/002689 patent/WO2008003359A1/de active Application Filing
- 2007-03-27 EP EP07723635A patent/EP2010784B1/de not_active Not-in-force
- 2007-03-27 US US12/303,979 patent/US8241019B2/en active Active
- 2007-03-27 CA CA2656624A patent/CA2656624C/en not_active Expired - Fee Related
- 2007-03-27 MX MX2008015894A patent/MX2008015894A/es active IP Right Grant
- 2007-03-27 JP JP2009516917A patent/JP2009541647A/ja active Pending
- 2007-03-27 BR BRPI0712630-1A patent/BRPI0712630A2/pt not_active IP Right Cessation
- 2007-03-27 DE DE502007001643T patent/DE502007001643D1/de active Active
- 2007-03-27 RU RU2009103763/06A patent/RU2397365C1/ru not_active IP Right Cessation
- 2007-03-27 AT AT07723635T patent/ATE444444T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO2008003359A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20090180905A1 (en) | 2009-07-16 |
WO2008003359A1 (de) | 2008-01-10 |
US8241019B2 (en) | 2012-08-14 |
BRPI0712630A2 (pt) | 2012-10-23 |
MX2008015894A (es) | 2009-03-06 |
CN101484700A (zh) | 2009-07-15 |
ES2333178T3 (es) | 2010-02-17 |
JP2009541647A (ja) | 2009-11-26 |
DE502007001643D1 (de) | 2009-11-12 |
EP2010784B1 (de) | 2009-09-30 |
CA2656624A1 (en) | 2008-01-10 |
CA2656624C (en) | 2011-09-13 |
DE102007014688A1 (de) | 2008-01-10 |
RU2397365C1 (ru) | 2010-08-20 |
CN101484700B (zh) | 2011-07-20 |
ATE444444T1 (de) | 2009-10-15 |
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