EP2997261B1 - Membrane pump with positional control - Google Patents
Membrane pump with positional control Download PDFInfo
- Publication number
- EP2997261B1 EP2997261B1 EP14723083.3A EP14723083A EP2997261B1 EP 2997261 B1 EP2997261 B1 EP 2997261B1 EP 14723083 A EP14723083 A EP 14723083A EP 2997261 B1 EP2997261 B1 EP 2997261B1
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- European Patent Office
- Prior art keywords
- pressure
- diaphragm
- closing portion
- valve
- wall element
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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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/06—Pumps having fluid drive
- F04B43/073—Pumps having fluid drive the actuating fluid being controlled by at least one valve
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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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/06—Pumps having fluid drive
- F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
Definitions
- the present invention relates to a hydraulically driven diaphragm pump.
- Such diaphragm pumps have a delivery chamber, both a suction port and a pressure port, which are both connected to the pumping chamber, a working space which is filled with a hydraulic fluid, a means for applying the hydraulic fluid with an oscillating pressure p 1 , a membrane, which Conveying space and the working space separated from each other and between a Druckhubposition and a Saugubposition back and forth, wherein the volume of the pumping chamber in the Druckhubposition the membrane is smaller than in the suction stroke position of the membrane, a storage space for receiving the hydraulic fluid with the pressure p 2 , wherein the storage space and working space are connected to one another via a valve with a closure part.
- the suction port and pressure port are each connected via check valves to a suction line or a pressure line.
- the membrane may be resiliently biased in the direction of the suction stroke position.
- the membrane will assume a position in which the forces acting on the membrane, i. the force applied by the fluid pressure in the delivery chamber and optionally by the resilient bias in the direction of suction stroke position on the one hand and the force applied by the fluid pressure in the working space in the direction of Druckhubposition force on the other hand, cancel each other.
- the fluid pressure in the working space is reduced and thereby becomes smaller than the pressure in the delivery chamber, this leads to a movement of the diaphragm in the direction of the suction stroke position. Due to the associated increase in the delivery chamber volume and the pressure in the delivery chamber decreases. If the fluid pressure in the delivery chamber falls below a value predetermined by the pressure in the suction line (usually ambient pressure) and the check valve, the check valve on the suction line opens and delivery fluid is sucked out of the suction line into the delivery chamber via the suction connection.
- the pressure in the suction line usually ambient pressure
- the diaphragm is moved from the suction stroke position in the direction of the pressure stroke position, whereby the pressure in the delivery chamber is increased and the delivery fluid in the delivery chamber is forced into the pressure conduit via the pressure connection.
- the pressurization of the hydraulic fluid with an oscillating pressure thus leads to an oscillating movement of the diaphragm and, associated therewith, to an oscillating pumping action of the delivery fluid from the suction line into the pressure line.
- Such hydraulically driven diaphragm pumps are used in particular in the promotion of conveying fluid under very high pressures, since the membrane is evenly loaded by the hydraulic fluid and has a longer service life.
- the pressurization of the hydraulic fluid with an oscillating pressure is usually carried out by means of a moving piston. Even with the best processing of the individual moving parts can still come to flow around the piston with hydraulic fluid, so that the amount of fluid in the working space deviates from the optimum amount, which means that the membrane is either moved beyond the Druckhubposition, resulting in a perforation or Destruction of the membrane may result, or the membrane no longer reaches the Druckhubposition, whereby the delivery volume per stroke is reduced. Both are undesirable.
- the EP 0 547 404 is described a hydraulically driven diaphragm pump.
- the working space is connected via a leak-relief valve to the reservoir.
- the leak-relief valve opens and hydraulic fluid can flow from the working space into the storage space.
- the membrane is at the EP 0 547 404 connected to a spool, which, in the event that the diaphragm moves beyond the pressure stroke position away from the suction stroke position, is connected to a valve member which provides the hydraulic connection from the part of the working space in which the piston generating the oscillating pressure is located , and the part of the working space in which the membrane is arranged interrupts.
- a diaphragm pump having the features of the preamble of claim 1 is known from document JP H03 149371 A known.
- this is achieved in that the membrane is coupled to the closure part in such a way that upon movement of the membrane from the pressure stroke position to a position farther away from the suction stroke position, the valve is opened.
- a pull rod which is attached to the membrane may be provided, wherein the closure part is connected to the pull rod.
- the closure member is movably secured to the pull rod so that the closure member can be reciprocated relative to the pull rod between two positions designed to be in the push stroke position of the diaphragm when the closure member in the first position, the valve is closed and, when the closure member is in the second position, the valve is open.
- the closure part is resiliently biased in the first position.
- the membrane can perform a certain movement without the closure part opens the valve. Only when the membrane is in a position farther away from the suction stroke position than the pressure stroke position, the closure member is moved out of the valve seat due to the mechanical connection with the diaphragm, so that the valve is opened.
- the resilient bias of the closure part is dimensioned such that, if for the pressure difference between the pressure in the reservoir and the pressure in the working space is: p 2 - p 1 > a , where a is a predetermined pressure, the closure part is moved from the first position towards the second position and the valve is opened.
- a is determined by the choice of the spring constant of the resilient bias.
- This measure ensures that, in the event of fluid loss in the working space, fluid can be replenished from the storage space as soon as the pressure in the working space falls below a predetermined value.
- the membrane is resiliently biased in the direction of the suction stroke, wherein this is preferably effected by a resiliently biased pull rod.
- the return movement of the membrane from the Druckhubposition is ensured in the suction stroke position even if in the delivery chamber no or too low a delivery fluid pressure is applied.
- the pump at the suction port must suck delivery fluid so that then the delivery fluid pressure drops in the delivery chamber and the bias is required to move the membrane in the direction of suction stroke.
- the working space is arranged in a housing, wherein the housing has a wall element with a passage to the reservoir and a valve seat, wherein preferably the wall element is movably arranged in an opening of the housing.
- valve can also be opened without movement of the closure part in which the wall element and thus the valve seat is moved relative to the closure part.
- the wall element is resiliently biased in the direction of the housing opening, wherein preferably in the opening a stop element is arranged, against which the wall element is resiliently biased.
- the resilient bias of the wall element is advantageously dimensioned such that, if, for the pressure difference between the pressure in the working space and the pressure in the reservoir: p 1 - p 2 > b, where b is a predetermined pressure, the wall element of the Moves the closure part and thereby the valve opens.
- FIG. 1 is a schematic representation of a portion of a diaphragm pump shown.
- the diaphragm pump according to the invention has a delivery chamber (not shown), a suction connection (not shown) connected to the delivery chamber and a pressure connection (not shown).
- a working space 7 is filled with a hydraulic fluid. The hydraulic fluid can be acted upon via the channel 12 with an oscillating pressure p 1 .
- a membrane (not shown) is provided, which separates the delivery chamber and the working space 7 from each other.
- the membrane is clamped between the delivery chamber housing (not shown) and the component 3. This membrane is held by means of the head 2 of a tie rod 1 in position.
- the pumping room is then in the FIG. 1 to the left of the head 2 of the tie rod 1.
- the drawbar 1 is shown in its Druckhubposition, that is, this is the position which the tie rod 1 and thus the membrane should take at the end of the print stroke.
- This position is usually achieved by the pressure p 1 is increased in the working space 7, so that the pressurized fluid through the channels 18 pressure on the with the head 2 of the drawbar. 1 connected membrane exerts and this in the direction of the delivery chamber, ie to the left in FIG. 1 , presses.
- the drawbar 1 and thus the connected via the head 2 with the pull rod 1 membrane is by means of the spring 4, which is supported on the one hand on the component 3 and on the other hand on a collar-shaped extension of the tie rod 1, resilient in the direction of the suction stroke, ie in the FIG. 1 to the right, biased. Therefore, decreases the pressure p 1 in the working space 7, so the spring 4 ensures that the pull rod 1 and thus the membrane is moved in the direction of suction stroke, whereby the volume is increased in the delivery chamber.
- the corresponding suction stroke position is in FIG. 2 shown. In this position, the membrane (not shown) bears against the conical surfaces of the component 3.
- the pull rod 2 moves alternately against the spring force of the spring 4 in the direction of Druckhubposition (in FIG. 1 shown) and due to the spring force of the spring 4 in the direction of the suction stroke position (in FIG. 2 shown).
- the pull rod 2 is connected to a closure part 5, which cooperates with a valve seat inserted in the wall element 9.
- the wall element 9 has a connection 17, via which the working space 7 is filled with a reservoir 8, in which hydraulic fluid at the pressure p 2 (this is essentially the ambient pressure).
- the closure element 5 is positioned in the valve seat of the wall element 9 during proper operation of the pump, so that the connection 17 between the working space 7 and storage space 8 is closed.
- the closure element 6 is movably arranged within the pull rod 1.
- the pull rod has corresponding slots 15, in which a pin 14 which is fixed to the closure element 6, engages.
- the shutter member 6 can be reciprocated relative to the pull rod 1 in the longitudinal direction between two positions. These positions are selected so that when moving between the pressure stroke and the suction stroke, ie when moving between the two in the FIGS. 1 and 2 shown usual extreme positions, the closure element 5, the connection 17 between the working space 7 and the reservoir 8 can keep closed.
- there is an additional one Spring 6 is provided, which presses the closure element in the direction of the wall element 9, ie in the direction of the valve seat. The spring 6 is supported for this purpose on the tie rod 1.
- Too little hydraulic fluid in the working space 7 also causes at least at the end of the suction stroke, ie substantially in the in FIG. 2 Suction stroke position shown, the pressure p 1 in the working space drops sharply. While such a pressure drop does not adversely affect pump operation, it can be used to provide a leak supplement.
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Description
Die vorliegende Erfindung betrifft eine hydraulisch angetriebene Membranpumpe. Solche Membranpumpen besitzen einen Förderraum, sowohl einen Sauganschluss als auch einen Druckanschluss, welche beide mit dem Förderraum verbunden sind, einen Arbeitsraum, welcher mit einem Hydraulikfluid befüllt ist, eine Einrichtung zum Beaufschlagen des Hydraulikfluids mit einem oszillierenden Druck p1, eine Membran, welche den Förderraum und den Arbeitsraum voneinander trennt und zwischen einer Druckhubposition und einer Saughubposition hin- und herbewegbar ist, wobei das Volumen des Förderraums in der Druckhubposition der Membran kleiner ist als in der Saughubposition der Membran, einen Vorratsraum zur Aufnahme des Hydraulikfluids mit dem Druck p2, wobei Vorratsraum und Arbeitsraum über ein Ventil mit einem Verschlussteil miteinander verbunden sind.The present invention relates to a hydraulically driven diaphragm pump. Such diaphragm pumps have a delivery chamber, both a suction port and a pressure port, which are both connected to the pumping chamber, a working space which is filled with a hydraulic fluid, a means for applying the hydraulic fluid with an oscillating pressure p 1 , a membrane, which Conveying space and the working space separated from each other and between a Druckhubposition and a Saugubposition back and forth, wherein the volume of the pumping chamber in the Druckhubposition the membrane is smaller than in the suction stroke position of the membrane, a storage space for receiving the hydraulic fluid with the pressure p 2 , wherein the storage space and working space are connected to one another via a valve with a closure part.
Im Betrieb sind Sauganschluss und Druckanschluss jeweils über Rückschlagventile mit einer Saugleitung bzw. einer Druckleitung verbunden.In operation, the suction port and pressure port are each connected via check valves to a suction line or a pressure line.
Die Membran kann federnd in Richtung der Saughubposition vorgespannt sein. Die Membran wird eine Position einnehmen, in der die auf die Membran wirkenden Kräfte, d.h. die von dem Fluiddruck im Förderraum und gegebenenfalls durch die federnde Vorspannung in Richtung Saughubposition aufgebrachte Kraft einerseits und die von dem Fluiddruck im Arbeitsraum in Richtung Druckhubposition aufgebrachte Kraft andererseits, sich gegenseitig aufheben.The membrane may be resiliently biased in the direction of the suction stroke position. The membrane will assume a position in which the forces acting on the membrane, i. the force applied by the fluid pressure in the delivery chamber and optionally by the resilient bias in the direction of suction stroke position on the one hand and the force applied by the fluid pressure in the working space in the direction of Druckhubposition force on the other hand, cancel each other.
Wird daher der Fluiddruck im Arbeitsraum reduziert und wird dadurch kleiner als der Druck im Förderraum, führt dies zu einer Bewegung der Membran in Richtung Saughubposition. Durch die damit verbundene Vergrößerung des Förderraumvolumens nimmt auch der Druck im Förderraum ab. Unterschreitet der Fluiddruck im Förderraum einen durch den Druck in der Saugleitung (meist Umgebungsdruck) und dem Rückschlagventil vorgegebenen Wert, öffnet das Rückschlagventil an der Saugleitung und Förderfluid wird aus der Saugleitung über den Sauganschluss in den Förderraum gesaugt.Therefore, if the fluid pressure in the working space is reduced and thereby becomes smaller than the pressure in the delivery chamber, this leads to a movement of the diaphragm in the direction of the suction stroke position. Due to the associated increase in the delivery chamber volume and the pressure in the delivery chamber decreases. If the fluid pressure in the delivery chamber falls below a value predetermined by the pressure in the suction line (usually ambient pressure) and the check valve, the check valve on the suction line opens and delivery fluid is sucked out of the suction line into the delivery chamber via the suction connection.
Erhöht sich andererseits der Druck im Arbeitsraum, so wird die Membran von der Saughubposition in Richtung der Druckhubposition bewegt, wodurch der Druck im Förderraum erhöht wird und das im Förderraum befindliche Förderfluid wird über den Druckanschluss in die Druckleitung gepresst. Die Beaufschlagung des Hydraulikfluids mit einem oszillierenden Druck führt somit zu einer oszillierenden Bewegung der Membran und damit verbunden zu einem oszillierenden Pumpvorgang des Förderfluids aus der Saugleitung in die Druckleitung.On the other hand, if the pressure in the working space increases, the diaphragm is moved from the suction stroke position in the direction of the pressure stroke position, whereby the pressure in the delivery chamber is increased and the delivery fluid in the delivery chamber is forced into the pressure conduit via the pressure connection. The pressurization of the hydraulic fluid with an oscillating pressure thus leads to an oscillating movement of the diaphragm and, associated therewith, to an oscillating pumping action of the delivery fluid from the suction line into the pressure line.
Solche hydraulisch angetriebenen Membranpumpen kommen insbesondere bei der Förderung von Förderfluid unter sehr hohen Drücken zum Einsatz, da durch das Hydraulikfluid die Membran gleichmäßig belastet wird und eine höhere Lebensdauer aufweist.Such hydraulically driven diaphragm pumps are used in particular in the promotion of conveying fluid under very high pressures, since the membrane is evenly loaded by the hydraulic fluid and has a longer service life.
Die Beaufschlagung des Hydraulikfluids mit einem oszillierenden Druck erfolgt in der Regel mit Hilfe eines sich bewegenden Kolbens. Selbst bei bester Verarbeitung der einzelnen beweglichen Teilen kann es dennoch zu einem Umströmen des Kolbens mit Hydraulikfluid kommen, sodass die Fluidmenge im Arbeitsraum von der optimalen Menge abweicht, was bedeutet, dass die Membran entweder über die Druckhubposition hinausbewegt wird, was zu einer Perforierung bzw. Zerstörung der Membran führen kann, oder die Membran die Druckhubposition nicht mehr erreicht, wodurch das Fördervolumen pro Hub reduziert wird. Beides ist unerwünscht.The pressurization of the hydraulic fluid with an oscillating pressure is usually carried out by means of a moving piston. Even with the best processing of the individual moving parts can still come to flow around the piston with hydraulic fluid, so that the amount of fluid in the working space deviates from the optimum amount, which means that the membrane is either moved beyond the Druckhubposition, resulting in a perforation or Destruction of the membrane may result, or the membrane no longer reaches the Druckhubposition, whereby the delivery volume per stroke is reduced. Both are undesirable.
In der
Dieser Aufbau ist jedoch relativ kompliziert und ist zudem fehleranfällig, wenn aufgrund der Ausbildung des Ventilelementes eine hydraulikdichte Abtrennung des Kolbens vom Membranarbeitsraum nicht sichergestellt ist. Zudem muss im dem Teil des Arbeitsraumes, in dem der Kolben angeordnet ist, ein zusätzliches Überdruckventil vorgesehen werden, das ein Entweichen des Hydraulikfluids im Falle des Verschließens der Verbindung zum Membranarbeitsraum mit dem Ventilglied ermöglicht.However, this structure is relatively complicated and is also error-prone if, due to the formation of the valve element, a hydraulically tight separation of the piston from the membrane working space is not ensured. In addition, in the part of the working space in which the piston is arranged, an additional pressure relief valve must be provided which allows escape of the hydraulic fluid in the case of closing the connection to the diaphragm working space with the valve member.
Eine Membranpumpe mit den Merkmalen des Oberbegriffs von Anspruch 1 ist aus Dokument
Ausgehend von dem beschriebenen Stand der Technik ist es daher Aufgabe der vorliegenden Erfindung, eine Membranpumpe der eingangs genannten Art zur Verfügung zu stellen, die einfach aufgebaut ist und zuverlässig dafür sorgt, dass sich die Membran nicht zu weit über die Druckhubposition hinaus bewegen kann.Based on the described prior art, it is therefore an object of the present invention to provide a diaphragm pump of the type mentioned, which is simple in construction and reliably ensures that the membrane can not move too far beyond the Druckhubposition also.
Erfindungsgemäß wird dies dadurch gelöst, dass die Membran mit dem Verschlussteil derart gekoppelt ist, dass bei einer Bewegung der Membran von der Druckhubposition in eine Position, die weiter von der Saughubposition entfernt ist, das Ventil geöffnet wird.According to the invention, this is achieved in that the membrane is coupled to the closure part in such a way that upon movement of the membrane from the pressure stroke position to a position farther away from the suction stroke position, the valve is opened.
Sollte daher, weil beispielsweise zu viel Hydraulikfluid im Arbeitsraum ist, sich die Membran über die Druckhubposition hinaus bewegen, so führt die Kopplung der Membran mit dem Verschlusselement zu einer Ventilöffnung und Hydraulikfluid kann aus dem Arbeitsraum in den Vorratsraum entweichen, was zu einer deutlichen Reduzierung des Druckes im Arbeitsraum führt und daher eine weitere Bewegung der Membran über die Druckhubposition verhindert. Stattdessen wird aufgrund des Absinkens des Druckes im Arbeitsraum die Membran sich wieder in Richtung der Druckhubposition zurückbewegen, wodurch aufgrund der Kopplung der Membran mit dem Verschlussteil das Ventil wieder geschlossen wird.Therefore, should, for example, because too much hydraulic fluid in the working space, the membrane move beyond the Druckhubposition also, the coupling of the membrane with the closure element to a valve opening and hydraulic fluid can escape from the working space in the storage room, resulting in a significant reduction of Pressure in the working space leads and therefore prevents further movement of the diaphragm on the Druckhubposition. Instead, due to the decrease in pressure in the working space, the diaphragm will move back towards the pressure stroke position, closing the valve again due to the coupling of the diaphragm with the closure member.
Durch diese Maßnahme ist sichergestellt, dass eine Bewegung der Membran deutlich über die Druckhubposition hinaus in eine Position, die weiter von der Saughubposition entfernt ist, zuverlässig verhindert wird.By this measure, it is ensured that a movement of the membrane is significantly prevented beyond the Druckhubposition out into a position which is farther away from the suction stroke position.
Beispielsweise kann eine Zugstange, welche an der Membran befestigt ist, vorgesehen sein, wobei das Verschlussteil mit der Zugstange verbunden ist.For example, a pull rod, which is attached to the membrane may be provided, wherein the closure part is connected to the pull rod.
In einer bevorzugten Ausführungsform ist vorgesehen, dass das Verschlussteil beweglich mit der Zugstange befestigt ist, sodass das Verschlussteil relativ zur Zugstange zwischen zwei Positionen hin- und herbewegt werden kann, die derart ausgelegt sind, dass in der Druckhubposition der Membran, wenn das Verschlussteil in der ersten Position ist, das Ventil geschlossen ist und, wenn das Verschlussteil in der zweiten Position ist, das Ventil geöffnet ist.In a preferred embodiment it is provided that the closure member is movably secured to the pull rod so that the closure member can be reciprocated relative to the pull rod between two positions designed to be in the push stroke position of the diaphragm when the closure member in the first position, the valve is closed and, when the closure member is in the second position, the valve is open.
In einer weiteren bevorzugten Ausführungsform ist das Verschlussteil federnd in die erste Position vorgespannt.In a further preferred embodiment, the closure part is resiliently biased in the first position.
Durch diese Maßnahme kann somit die Membran eine gewisse Bewegung durchführen, ohne dass das Verschlussteil das Ventil öffnet. Erst wenn die Membran in eine Position gerät, die weiter von der Saughubposition entfernt ist als die Druckhubposition, wird das Verschlussteil aufgrund der mechanischen Verbindung mit der Membran aus dem Ventilsitz herausbewegt, so dass das Ventil geöffnet wird.By this measure, thus, the membrane can perform a certain movement without the closure part opens the valve. Only when the membrane is in a position farther away from the suction stroke position than the pressure stroke position, the closure member is moved out of the valve seat due to the mechanical connection with the diaphragm, so that the valve is opened.
In einer weiteren bevorzugten Ausführungsform ist die federnde Vorspannung des Verschlussteiles derart dimensioniert, dass, wenn für die Druckdifferenz zwischen dem Druck im Vorratsraum und dem Druck im Arbeitsraum gilt: p 2 - p 1 > a, wobei a ein vorbestimmter Druck ist, das Verschlussteil von der ersten Position in Richtung der zweiten Position bewegt wird und das Ventil geöffnet wird. Dabei wird a durch die Wahl der Federkonstanten der federnden Vorspannung bestimmt.In a further preferred embodiment, the resilient bias of the closure part is dimensioned such that, if for the pressure difference between the pressure in the reservoir and the pressure in the working space is: p 2 - p 1 > a , where a is a predetermined pressure, the closure part is moved from the first position towards the second position and the valve is opened. In this case, a is determined by the choice of the spring constant of the resilient bias.
Durch diese Maßnahme wird sichergestellt, dass bei Fluidverlust im Arbeitsraum Fluid aus dem Vorratsraum nachgefüllt werden kann, sobald der Druck im Arbeitsraum unter einen vorbestimmten Wert fällt.This measure ensures that, in the event of fluid loss in the working space, fluid can be replenished from the storage space as soon as the pressure in the working space falls below a predetermined value.
In einer weiteren bevorzugten Ausführungsform ist die Membran in Richtung des Saughubes federnd vorgespannt, wobei dies vorzugsweise durch eine federnd vorgespannte Zugstange bewirkt ist.In a further preferred embodiment, the membrane is resiliently biased in the direction of the suction stroke, wherein this is preferably effected by a resiliently biased pull rod.
Durch diese Maßnahme ist die Rückbewegung der Membran von der Druckhubposition in die Saughubposition auch dann gewährleistet, wenn in dem Förderraum kein oder ein zu geringer Förderfluiddruck anliegt. In den meisten Anwendungsfällen muss die Pumpe am Sauganschluss Förderfluid ansaugen, so dass dann der Förderfluiddruck im Förderraum abfällt und die Vorspannung benötigt wird, um die Membran in Richtung Saughub zu bewegen.By this measure, the return movement of the membrane from the Druckhubposition is ensured in the suction stroke position even if in the delivery chamber no or too low a delivery fluid pressure is applied. In most applications, the pump at the suction port must suck delivery fluid so that then the delivery fluid pressure drops in the delivery chamber and the bias is required to move the membrane in the direction of suction stroke.
In einer weiteren bevorzugten Ausführungsform ist vorgesehen, dass der Arbeitsraum in einem Gehäuse angeordnet ist, wobei das Gehäuse ein Wandelement mit einem Durchgang zum Vorratsraum und einen Ventilsitz aufweist, wobei vorzugsweise das Wandelement in einer Öffnung des Gehäuses beweglich angeordnet ist.In a further preferred embodiment it is provided that the working space is arranged in a housing, wherein the housing has a wall element with a passage to the reservoir and a valve seat, wherein preferably the wall element is movably arranged in an opening of the housing.
Mit anderen Worten kann das Ventil auch ohne Bewegung des Verschlussteils geöffnet werden in dem das Wandelement und damit der Ventilsitz relativ zum Verschlussteil bewegt wird.In other words, the valve can also be opened without movement of the closure part in which the wall element and thus the valve seat is moved relative to the closure part.
Durch die bewegliche Anordnung des Wandelementes und damit des Ventilsitzes kann das zusätzliche Vorsehen eines Überdruckventils vermieden werden. Sollte der Druck im Arbeitsraum zu stark ansteigen, wird dies zu einer Bewegung des Wandelementes und damit des Ventilsitzes in der Öffnung führen, was zur Folge hat, dass das Verschlussteil aus dem Ventilsitz bewegt wird und damit das Ventil geöffnet wird, sodass sich der Druck im Arbeitsraum durch die Verbindung zum Vorratsraum wieder erniedrigt.Due to the movable arrangement of the wall element and thus the valve seat, the additional provision of a pressure relief valve can be avoided. If the pressure in the working space rises too much, this will lead to a movement of the wall element and thus the valve seat in the opening, with the result that the closure part is moved out of the valve seat and thus the valve is opened, so that the pressure in Working space lowered again by the connection to the storage room.
Vorzugsweise ist das Wandelement federnd in Richtung der Gehäuseöffnung vorgespannt, wobei vorzugsweise in der Öffnung ein Anschlagselement angeordnet ist, gegen welches das Wandelement federnd vorgespannt ist.Preferably, the wall element is resiliently biased in the direction of the housing opening, wherein preferably in the opening a stop element is arranged, against which the wall element is resiliently biased.
Dabei ist die federnde Vorspannung des Wandelementes mit Vorteil derart dimensioniert, dass, wenn für die Druckdifferenz zwischen dem Druck im Arbeitsraum und dem Druck im Vorratsraum gilt: p 1 - p 2 > b, wobei b ein vorbestimmter Druck ist, das Wandelement sich von dem Verschlussteil wegbewegt und sich dadurch das Ventil öffnet.In this case, the resilient bias of the wall element is advantageously dimensioned such that, if, for the pressure difference between the pressure in the working space and the pressure in the reservoir: p 1 - p 2 > b, where b is a predetermined pressure, the wall element of the Moves the closure part and thereby the valve opens.
Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vorliegenden Erfindung werden deutlich anhand der folgenden Beschreibung einer bevorzugten Ausführungsform. Es zeigen:
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eine schematische Darstellung einer erfindungsgemäßen Ausführungsposition einer Membranpumpe in der Druckhubposition,Figur 1 -
eine schematische Darstellung einer erfindungsgemäßen Ausführungsposition einer Membranpumpe in der Saughubposition,Figur 2 -
eine schematische Darstellung für den Fall, dass zu viel Hydraulikfluid im Arbeitsraum ist,Figur 3 -
eine schematische Darstellung für den Fall, dass zu wenig Hydraulikfluid im Arbeitsraum ist, undFigur 4 -
eine schematische Darstellung zur Verdeutlichung der Überdruckfunktion.Figur 5
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FIG. 1 a schematic representation of an inventive execution position of a diaphragm pump in the Druckhubposition, -
FIG. 2 a schematic representation of an inventive execution position of a diaphragm pump in the suction stroke position, -
FIG. 3 a schematic representation in the event that too much hydraulic fluid in the working space, -
FIG. 4 a schematic representation for the case that too little hydraulic fluid in the working space, and -
FIG. 5 a schematic representation to illustrate the overpressure function.
In
Des Weiteren ist eine Membran (nicht gezeigt) vorgesehen, welche den Förderraum und den Arbeitsraum 7 voneinander trennt. Die Membran ist zwischen dem Förderraumgehäuse (nicht gezeigt) und dem Bauteil 3 eingeklemmt. Diese Membran wird mittels des Kopfes 2 einer Zugstange 1 in ihrer Position gehalten. Der Förderraum befindet sich dann in der
In
Die Zugstange 1 und damit die über den Kopf 2 mit der Zugstange 1 verbundene Membran ist mit Hilfe der Feder 4, welche sich einerseits am Bauteil 3 und andererseits an einer kragenförmigen Erweiterung der Zugstange 1 abstützt, federnd in Richtung des Saughubes, d.h. in der
Durch den oszillierenden Druck, der über den Kanal 12 an den Arbeitsraum 7 weitergegeben wird, bewegt sich die Zugstange 2 abwechselnd entgegen der Federkraft der Feder 4 in Richtung der Druckhubposition (in
Eine optimale Funktion der Membranpumpe ist nur dann gewährleistet, wenn die richtige Menge an Hydraulikfluid im Arbeitsraum 7 vorhanden ist, da nur dann die Membran und damit die Zugstange 2 die gewünschte Bewegung vollständig durchführen.An optimal function of the diaphragm pump is only guaranteed if the right amount of hydraulic fluid in the working
Die Zugstange 2 ist mit einem Verschlussteil 5 verbunden, welches mit einem in dem Wandelement 9 eingebrachten Ventilsitz zusammenarbeitet. Das Wandelement 9 weist eine Verbindung 17 auf, über welche der Arbeitsraum 7 mit einem Vorratsraum 8, in dem Hydraulikfluid mit dem Druck p2 (dies ist im Wesentlichen der Umgebungsdruck) befüllt ist.The
In der in den
Aufgrund immer vorhandener Lecks kann es jedoch passieren, dass sich zu viel Hydraulikfluid im Arbeitsraum 7 befindet. Dies hat zur Folge, dass sich die Membran über die in
Bei der gezeigten Ausführungsform führt eine Bewegung der Membran über die Druckhubposition hinaus zu der in
Grundsätzlich kann auch der Fall auftreten, dass zu wenig Hydraulikfluid im Arbeitsraum 7 enthalten ist. Dies führt dann dazu, dass die Pumpe die in
Wie in
Schließlich kann es bei den beschriebenen Membranpumpen passieren, dass aus irgendeinem Grund der Druck auf der Druckleitung stark zunimmt, sodass es nicht mehr gelingt, mit dem oszillierenden Druck p1 im Arbeitsraum 7 die Membran bis zur in
- 11
- Zugstangepull bar
- 22
- Kopfhead
- 33
- Bauteilcomponent
- 44
- Federfeather
- 55
- Verschlusselementclosure element
- 66
- Federfeather
- 77
- Arbeitsraumworking space
- 88th
- Vorratsraumpantry
- 99
- Wandelementwall element
- 1010
- Federfeather
- 1111
- Gehäusecasing
- 1212
- Kanalchannel
- 1313
- VorratsraumgehäusePantry housing
- 1414
- Zapfenspigot
- 1515
- LanglochLong hole
- 1616
- Anschlagattack
- 1717
- Verbindungconnection
- 1818
- Kanälechannels
Claims (5)
- A diaphragm pump comprising
a conveyor chamber,
a suction connection and a pressure connection which are both connected to the conveyor chamber,
a working chamber (7) which is filled with a hydraulic fluid,
a device for applying an oscillating pressure p1 to the hydraulic fluid,
a diaphragm which separates the conveyor chamber and the working chamber (7) from each other and which is reciprocable between a pressure stroke position and a suction stroke position, wherein the volume of the conveyor chamber in the pressure stroke position of the diaphragm is smaller than in the suction stroke position of the diaphragm,
a storage chamber (8) for accommodating hydraulic fluid at the pressure p2,
wherein the storage chamber (8) and the working chamber (7) are connected together by way of a valve having a closing portion (5),
wherein the diaphragm is coupled to the closing portion (5) in such a way that upon a movement of the diaphragm from the pressure stroke position into a position which is further away from the suction stroke position the valve is opened, wherein a tie rod (1) fixed to the diaphragm is provided, wherein the closing portion (5) is connected to the tie rod (1), wherein the closing portion (5) is moveably fixed to the tie rod (1) so that the closing portion (5) can be reciprocated relative to the tie rod (1) between two positions which are such that in the pressure stroke position of the diaphragm when the closing portion is in the first position the valve is closed and in the second position of the closing portion (5) the valve is opened, characterised in that the closing portion (5) is resiliently biased into the first position, and the resilient biasing of the closing portion is of such a magnitude that, when p2 - p1 > a applies for the pressure difference between the pressure in the storage chamber (8) and the pressure in the working chamber (7), wherein a is a predetermined pressure, the closing portion is moved from the first position in the direction of the second position and the valve is opened. - A diaphragm pump as set forth in claim 1 characterised in that the diaphragm is resiliently biased in the direction of the suction stroke, wherein that is preferably caused by a resiliently biased tie rod (1).
- A diaphragm pump as set forth in one of claims 1 through 2 characterised in that the working chamber (7) is arranged in a housing (11), wherein the housing (11) has a wall element (9) with a valve seat, wherein preferably the wall element (9) is arranged moveably in an opening in the housing (11).
- A diaphragm pump as set forth in claim 3 characterised in that the wall element (9) is resiliently biased in the direction of the housing opening, wherein preferably arranged in the opening is an abutment element (16) towards which the wall element (9) is resiliently biased.
- A diaphragm pump as set forth in claim 4 characterised in that the resilient biasing of the wall element (9) is of such a magnitude that, when p1 -p2 > b applies for the pressure difference between the pressure in the working chamber (7) and the pressure in the storage chamber (8), wherein b is a predetermined pressure, the wall element (9) moves away from the closing portion (5) and as a result the valve opens.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013105072.7A DE102013105072A1 (en) | 2013-05-16 | 2013-05-16 | Diaphragm pump with position control |
PCT/EP2014/059614 WO2014184125A1 (en) | 2013-05-16 | 2014-05-12 | Diaphragm pump having position control |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2997261A1 EP2997261A1 (en) | 2016-03-23 |
EP2997261B1 true EP2997261B1 (en) | 2017-01-11 |
Family
ID=50687501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14723083.3A Active EP2997261B1 (en) | 2013-05-16 | 2014-05-12 | Membrane pump with positional control |
Country Status (8)
Country | Link |
---|---|
US (1) | US9964105B2 (en) |
EP (1) | EP2997261B1 (en) |
CN (1) | CN105209758B (en) |
BR (1) | BR112015028148A2 (en) |
CA (1) | CA2909976A1 (en) |
DE (1) | DE102013105072A1 (en) |
ES (1) | ES2617031T3 (en) |
WO (1) | WO2014184125A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017122270B4 (en) * | 2017-09-26 | 2020-09-10 | Prominent Gmbh | Diaphragm pump with a functionally reliable diaphragm position control |
DE102018111601B4 (en) * | 2018-05-15 | 2020-09-24 | Prominent Gmbh | Membrane system control with magnetically held locking element |
CN114962224B (en) * | 2022-05-14 | 2024-07-02 | 西安秦泰汽车排放技术有限公司 | System for conveying fluid |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR906965A (en) * | 1943-09-02 | 1946-02-26 | High pressure pump for corosive liquid and wearer intended more especially for the treatment of trees by spraying | |
DE1034030B (en) * | 1955-09-22 | 1958-07-10 | Reiners Walter Dr Ing | Diaphragm pump for non-lubricating and chemically aggressive fluids, especially for pest control in agriculture |
US2993446A (en) * | 1957-06-01 | 1961-07-25 | Pleuger | Diaphragm piston pump |
US3769879A (en) * | 1971-12-09 | 1973-11-06 | A Lofquist | Self-compensating diaphragm pump |
DE2843054C2 (en) | 1978-10-03 | 1983-07-14 | Bran & Lübbe GmbH, 2000 Norderstedt | Piston diaphragm pump |
JPH03149371A (en) * | 1989-11-02 | 1991-06-25 | Nippon Fuiidaa Kogyo Kk | Diaphragm pump |
DE4141670C2 (en) | 1991-12-17 | 1994-09-29 | Ott Kg Lewa | Hydraulically driven diaphragm pump with diaphragm stroke limitation |
US7665974B2 (en) * | 2007-05-02 | 2010-02-23 | Wanner Engineering, Inc. | Diaphragm pump position control with offset valve axis |
CN201635971U (en) * | 2009-12-26 | 2010-11-17 | 浙江工业大学 | Reciprocating type hydraulic membrane pump |
DE102010039829A1 (en) | 2010-08-26 | 2012-03-01 | Prominent Dosiertechnik Gmbh | Diaphragm pump with inertia-controlled leak-relief valve |
-
2013
- 2013-05-16 DE DE102013105072.7A patent/DE102013105072A1/en not_active Withdrawn
-
2014
- 2014-05-12 BR BR112015028148A patent/BR112015028148A2/en not_active Application Discontinuation
- 2014-05-12 CA CA2909976A patent/CA2909976A1/en not_active Abandoned
- 2014-05-12 EP EP14723083.3A patent/EP2997261B1/en active Active
- 2014-05-12 ES ES14723083.3T patent/ES2617031T3/en active Active
- 2014-05-12 WO PCT/EP2014/059614 patent/WO2014184125A1/en active Application Filing
- 2014-05-12 CN CN201480027675.3A patent/CN105209758B/en active Active
- 2014-05-12 US US14/783,996 patent/US9964105B2/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP2997261A1 (en) | 2016-03-23 |
WO2014184125A1 (en) | 2014-11-20 |
CA2909976A1 (en) | 2014-11-20 |
ES2617031T3 (en) | 2017-06-15 |
US20160069341A1 (en) | 2016-03-10 |
CN105209758A (en) | 2015-12-30 |
BR112015028148A2 (en) | 2017-07-25 |
US9964105B2 (en) | 2018-05-08 |
DE102013105072A1 (en) | 2014-11-20 |
CN105209758B (en) | 2017-09-01 |
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