EP0280901B1 - Plunger pump - Google Patents

Plunger pump Download PDF

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Publication number
EP0280901B1
EP0280901B1 EP88101593A EP88101593A EP0280901B1 EP 0280901 B1 EP0280901 B1 EP 0280901B1 EP 88101593 A EP88101593 A EP 88101593A EP 88101593 A EP88101593 A EP 88101593A EP 0280901 B1 EP0280901 B1 EP 0280901B1
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EP
European Patent Office
Prior art keywords
plunger
pump
plungers
pressure
suction valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88101593A
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German (de)
French (fr)
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EP0280901A3 (en
EP0280901A2 (en
Inventor
Nabil Dipl.-Ing. Hanafi
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URACA PUMPENFABRIK GmbH and Co KG
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URACA PUMPENFABRIK GmbH and Co KG
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Publication of EP0280901A2 publication Critical patent/EP0280901A2/en
Publication of EP0280901A3 publication Critical patent/EP0280901A3/en
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Publication of EP0280901B1 publication Critical patent/EP0280901B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders
    • 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
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • F04B49/243—Bypassing by keeping open the inlet valve

Definitions

  • the invention relates to a plunger pump with at least two plunger work spaces and the same associated, in-phase working plungers or plunger parts, which displace different or equal amounts of the pump medium in their in-phase strokes, and with a triggerable suction valve, which the working space of the larger volume displacing a plunger or Is assigned to the plunger part and, when triggered, remains permanently in the open position, so that when the suction valve is triggered by means of the other plunger or plunger part displacing the smaller volume, a low flow rate with high pressure and when the suction valve is working by means of the work of both plunger or plunger parts large flow with low pressure with unchanged power requirement of the pump allowed to generate.
  • Conventional plunger pumps switchable between high and low pressure typically have plungers with two sections of different cross sections, such that a relatively large annular step is formed between the section with the larger cross section and the section with the smaller cross section.
  • the section with the smaller cross section arranged as the free end of the plunger works in a first plunger work space, while the area with the ring step works in a second work space which is sealed off from the first work space.
  • Each work area has separate suction and pressure valves, the suction valve of the work area accommodating the annular step portion of the plunger being releasable, so that this pump part is ineffective when the suction valve is triggered and is therefore permanently open. In this case, only the pump part formed by the working space for the free plunger end with the small cross section works.
  • a plunger pump of the type specified above in that the two plunger work spaces are connected to one another by a line with a check valve closing in the direction of the work space of a plunger or plunger part, the suction side of the pump only via the triggerable suction valve to the work space one plunger or plunger part is connected and the pressure side of the pump is connected to the plunger work space of the other plunger or plunger part only via a pressure valve assigned to it.
  • the working spaces of the two plungers or plunger parts displacing different volumes are connected in series, i.e. the flow of the pump passes through both working spaces of the two plungers or plunger parts. Because of this arrangement, only three valves are necessary for the two workrooms.
  • the check valve arranged in the line between the plunger work spaces when the suction valve is triggered works in the usual way as a suction valve of the plunger work space with the plunger or plunger part displacing the smaller volume, while the work of the other plunger or plunger part remains ineffective due to the triggered suction valve and the pump accordingly only works effectively with the other plunger or plunger part.
  • switchover valve arrangements on the pressure side of the pump are also unnecessary. Because of the series connection of the Working rooms, the entire delivery flow generated by the pump exits at the pressure valve of the working room, which is assigned to the plunger or plunger part displacing the smaller volume. It is therefore unnecessary to summarize the flow rates of the two work spaces by separate measures or to protect a pressure valve of a work space serving to generate a flow rate at low pressure from the high pressure which may be generated.
  • the two different volume displacing plungers or plunger parts are arranged in mutually parallel working spaces, which are arranged in an axial view of a crank engine driving the plungers with the plunger lying on top of one another or with the plunger standing up are.
  • the two plungers or plunger parts by means of a common crosshead or slide with a common one, with the crosshead or slide through connecting rods or the like. drive-connected crank crankshaft crank drive are coupled.
  • This design is characterized by its particular compactness.
  • the crankshaft can be dimensioned relatively short.
  • the two working spaces of the plunger or plunger parts can easily be accommodated in a block whose height or width is less than the height or width of the crankcase.
  • this design is characterized in that largely conventional parts can be used for crank mechanisms, crossheads and plungers.
  • the pump shown has a crank mechanism 1 with a crankcase 2, a crankshaft 3, connecting rods 4 and crossheads 5, which are displaceably arranged in piston-like manner in crosshead guides 6 and carry out lifting movements in a known manner when the crankshaft 3 rotates.
  • Each crosshead 5 is connected to two plungers 7 and 8, which are arranged within associated plunger work spaces 9 and 10, which in turn are arranged as parts of a cylinder block 11 connected to the crankcase 2.
  • the plungers 7 and 8 are guided in a known manner in sealing arrangements 12 at the ends of the plunger work spaces 9 and 10 on the crosshead side in order to seal the plunger work spaces 9 and 10 towards the crossheads 5.
  • the upper plunger 8 in the figure has a smaller cross section than the lower plunger 7. Accordingly, the plungers 7 and 8 displace different amounts of media during their strokes.
  • valve block 13 On the side facing away from the cross heads 5, the cylinder block 11 is connected to a valve block 13 which has a total of three valves for the two plunger work spaces 9 and 10, namely a suction valve connecting the plunger work space 9 with the suction side or a suction line (not shown) of the pump 14, a check valve 15 arranged between the plunger work spaces 9 and 10 and allowing only a flow in the direction of the plunger work space 10, and a pressure valve 16 leading from the plunger work space 10 to the pressure side or a pressure line (not shown) of the pump.
  • the valves 14 to 16 are schematized as ball valves shown, in principle, however, other valve constructions are possible and generally also useful.
  • the suction valve 14 is designed to be triggered, i.e.
  • the valve body of the suction valve 14 can be kept permanently in the open position by means of a tappet 17. Additional valves are not required for plunger rooms 9 and 10.
  • the plunger working spaces 9 and 10 fill with pump medium which flows in through the valves 14 and 15 opening in the suction stroke, the suction valve 14 being different from the sum of the Plunger work rooms 9 and 10 penetrating currents and the check valve 15 are only penetrated by the current flowing into the plunger work room 10.
  • the pressure valve 16 remains closed, because in the plunger work space 10 there is only the pressure on the suction side of the pump which is reduced compared to the pressure side of the pump or a pressure slightly below it.
  • the suction valve 14 closes, while the check valve 15 remains open or is again brought into the open position together with the now opening pressure valve 16 because the plunger 7 is now medium displace medium from the plunger work space 10 from the plunger work space 9 and the plunger 8. Accordingly, the check valve 15 is traversed by the medium flowing out of the plunger work space 9, while the pressure valve 16 flows through the sum of the quantities of the pump medium emerging from the plunger work spaces 9 and 10.
  • the mode of operation described above is low-pressure operation because the pump works with both plungers 7 and 8 and thus with a relatively large plunger cross section. If the pump is to operate in high pressure mode, the suction valve 14 is triggered by corresponding actuation of the tappet 17 and is thus kept in the open position continuously. Accordingly, the plunger 7 cannot do any pumping work, rather the medium sucked in by him in the suction stroke during the pressure stroke is conveyed back through the suction valve 14 to the suction side of the pump.
  • the check valve 15 now works in the manner of a conventional suction valve, ie the check valve 15 opens in the suction stroke of the plunger 8 and closes on its pressure stroke, since in the plunger work space 9 due to the permanently open suction valve 14 only a reduced pressure compared to the pressure in the plunger work space 10 may be approximately corresponding to the suction-side pressure of the pump. Otherwise, the pressure valve 16 opens during the pressure stroke of the plunger 8 under the influence of the medium displaced by the plunger 8. Since in this phase the pump can only perform effective pumping work with the plunger 8 and works with a relatively small plunger cross-section, very high pressures can be generated without increasing the power of a drive unit which drives the crankshaft 3.
  • a special feature of the pump shown is the series connection of the plunger work rooms 9 and 10, i.e. the entire medium conveyed by the plungers 7 and 8 to the pressure side passes through the plunger work spaces 9 and 10 in succession.
  • the plunger work rooms 9 and 10 i.e. the entire medium conveyed by the plungers 7 and 8 to the pressure side passes through the plunger work spaces 9 and 10 in succession.
  • the cross head 5 shown only schematically, consists essentially of two rod parts 18 with a circular cross section, which are arranged coaxially with the plungers 7 and 8, the rod parts 18 possibly being hollow to reduce weight.
  • the rod parts 18 are separately slidably mounted in guide bushings 19, which are arranged in suitable cylinder bores of the crankcase 2.
  • the rod parts 18 are connected in the longitudinal direction by means of a yoke 20 without being displaceable relative to one another.
  • the yoke 20 is in turn articulated to the connecting rod 4.
  • the ends of the rod parts 18 facing away from the yoke 20 are releasably connected in a generally known manner to the plungers 7 and 8 as in conventional pumps, the plungers 7 and 8 being able to have a limited angular mobility, in particular relative to the rod parts 18, so that assembly tolerances in the Alignment of crankcase 2 and cylinder block 11 are unproblematic.
  • the invention is not restricted to plunger pumps in the narrower sense. Instead of the plungers shown, other displacement arrangements can also be provided. In principle, this does not change the arrangement of the valves 14 to 16.
  • both plungers 7 and 8 with the same cross-sections and to achieve the different displaced quantities per stroke in that the plungers carry out strokes of different sizes, for example by driving-coupled plungers with differently dimensioned crankshaft crankshafts .
  • valves 14 to 16 can also be arranged in a corresponding manner in the known pump described at the outset, so that the working space receiving the annular step region of the plunger is connected in series to the other working space, which takes up the free plunger end with a smaller cross section.
  • a pump construction is generally less useful because of the large dimension in the longitudinal direction of the plunger.
  • a plunger seal must be arranged between the two plunger work spaces and is therefore only at very low pressure differences, especially when the pump is operated at low pressure when the stepped plunger works effectively in both work spaces in the pressure stroke. Such is undesirable in view of a good sealing effect, as is required above all in high-pressure operation, when the plunger does effective pumping work only with its free end, which has a small cross section.
  • the pump according to the invention can optionally also be used advantageously as a control pump. Depending on whether the suction valve 14 is triggered or not, the pump then works effectively with both plungers 7 and 8 or only with the plunger 8.
  • the pump can work in both operating states of the suction valve on the pressure side against a constant pressure, so that the pump depending on the effective plunger cross section (when the suction valve 14 is triggered, the cross section of the plunger 8; when the suction valve 14 is not triggered, the sum of the cross sections of the plungers 7 and 8) operates with correspondingly different delivery rates and outputs.
  • the pump according to the invention can optionally be converted to achieve a particularly large flow rate at a relatively low pressure.
  • each pump can be modified to achieve a particularly large delivery rate at low pressure by arranging plungers with an enlarged cross-section, with the plunger working spaces also generally having to be drilled out in order to be able to arrange the changed plungers.
  • Such a modification of a pump is, however, only to a limited extent possible because a maximum possible plunger diameter is specified based on the pitch dimension given by the crank engine, ie the distance of the plunger axes or crank crankings in the axial direction of the crankshaft.
  • the diameter of the plunger 8 can be increased significantly, usually at least to the size of the plunger 7, i.e. the cylinder block 11 allows the arrangement of a significantly larger plunger 8 and a working space 10 with a correspondingly enlarged cross section.
  • a pump with an extremely high flow rate can thereby be achieved, whereby the triggering device 17 for the suction valve 14 and the check valve 15 between the plunger work spaces 9 and 10 can be dispensed with. All that is needed is a permanently open connection line between the plunger work rooms 9 and 10, which is arranged instead of the check valve 15.
  • a one-piece crosshead with a large, possibly oval cross section can also be arranged and connected directly to the plungers 7 and 8 and the connecting rod 4. With such a construction, the yoke 20 is unnecessary.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft eine Plungerpumpe mit mindestens zwei Plungerarbeitsräumen sowie denselben zugeordneten, gleichphasig arbeitenden Plungem bzw. Plungerteilen, welche bei ihren gleichphasigen Hüben unterschiedliche oder gleiche Mengen des Pumpmediums verdrängen, sowie mit einem auslösbaren Saugventil, welches dem Arbeitsraum des das größere Volumen verdrängenden einen Plungers bzw. Plungerteiles zugeordnet ist und im ausgelösten Zustand dauernd in Offenstellung bleibt, so daß die Pumpe bei ausgelöstem Saugventil mittels des das kleinere Volumen verdrängenden anderen Plungers bzw. Plungerteiles einen geringen Förderstrom mit hohem Druck und bei arbeitendem Saugventil mittels der Arbeit beider Plunger bzw. Plungerteile einen großen Förderstrom mit niedrigem Druck bei unverändertem Leistungsbedarf der Pumpe zu erzeugen gestattet.The invention relates to a plunger pump with at least two plunger work spaces and the same associated, in-phase working plungers or plunger parts, which displace different or equal amounts of the pump medium in their in-phase strokes, and with a triggerable suction valve, which the working space of the larger volume displacing a plunger or Is assigned to the plunger part and, when triggered, remains permanently in the open position, so that when the suction valve is triggered by means of the other plunger or plunger part displacing the smaller volume, a low flow rate with high pressure and when the suction valve is working by means of the work of both plunger or plunger parts large flow with low pressure with unchanged power requirement of the pump allowed to generate.

Pumpen, die Förderströme mit unterschiedlichen Drucken zu erzeugen vermögen, werden beispielsweise in Verbindung mit Spritzgeräten für Reinigungszwecke, beispielsweise zur Reinigung von Müllbehältern od.dgl., benötigt. Mit Spritzstrahlen sehr hohen Druckes können auch hartnäckige bzw. sehr feste Verschmutzungen gelöst werden, während Spritzstrahlen mit geringerem Druck zunächst zur Befeuchtung der Verschmutzungen bzw. zum Wegschwemmen gelösten Schmutzes dienen können.Pumps that are able to generate flow rates with different pressures are required, for example, in connection with spraying devices for cleaning purposes, for example for cleaning garbage containers or the like. Stubborn or very solid dirt can also be removed with spray jets of very high pressure, while spray jets with lower pressure can initially serve to moisten the dirt or to wash away loosened dirt.

Herkömmliche zwischen Hoch- und Niederdruck umschaltbare Plungerpumpen besitzen typischerweise Plunger mit zwei Abschnitten unterschiedlicher Querschnitte, dergestalt, daß zwischen dem Abschnitt mit dem größeren Querschnitt und dem Abschnitt mit dem geringeren Querschnitt eine relativ großflächige ringförmige Stufe gebildet wird. Der als freies Ende des Plungers angeordnete Abschnitt mit dem geringeren Querschnitt arbeitet in einem ersten Plungerarbeitsraum, während der Bereich mit der Ringstufe in einem zweiten, gegenüber dem ersten Arbeitsraum abgedichteten Arbeitsraum arbeitet. Jeder Arbeitsraum besitzt gesonderte Saug- und Druckventile, wobei das Saugventil des den Ringstufenabschnitt des Plungers aufnehmenden Arbeitsraumes auslösbar ist, so daß dieser Pumpenteil bei ausgelöstem und damit dauernd geöffnetem Saugventil unwirksam ist. In diesem Falle arbeitet also nur der durch den Arbeitsraum für das freie Plungerende mit dem geringen Querschnitt gebildete Pumpenteil. Dies bedeutet, daß nur ein relativ kleiner Förderstrom, jedoch mit sehr hohem Druck erzeugt werden kann. Wenn das auslösbare Saugventil normal öffnet und schließt, arbeitet die Pumpe dagegen mit beiden Arbeitsräumen simultan, so daß ein großer Förderstrom, jedoch mit relativ geringem Druck erzeugt werden kann. Druckseitig der Druckventile beider Arbeitsräume sind die Druckleitungen zusammengeführt, so daß beim Niederdruckbetrieb der Pumpe die aus beiden Pumpenarbeitsräumen austretenden Förderströme gemeinsam über eine einzige Leitung dem Verbraucher zugeführt werden können. Da das Druckventil des den Ringstufenbereich des Plungers aufnehmenden Arbeitsraumes in der Regel nur für relativ geringe Drucke ausgelegt ist, muß noch eine zusätzliche Umschaltventilanordnung vorhanden sein, welche beim Hochdruckbetrieb der Pumpe, d.h. wenn das Saugventil des den Ringstufenbereich des Plungers aufnehmenden Arbeitsraumes ausgelöst und damit dauernd geöffnet ist, das Druckventil dieses Arbeitsraumes gegenüber dem Druck des aus dem anderen Arbeitsraumes austretenden Förderstromes abschirmt.Conventional plunger pumps switchable between high and low pressure typically have plungers with two sections of different cross sections, such that a relatively large annular step is formed between the section with the larger cross section and the section with the smaller cross section. The section with the smaller cross section arranged as the free end of the plunger works in a first plunger work space, while the area with the ring step works in a second work space which is sealed off from the first work space. Each work area has separate suction and pressure valves, the suction valve of the work area accommodating the annular step portion of the plunger being releasable, so that this pump part is ineffective when the suction valve is triggered and is therefore permanently open. In this case, only the pump part formed by the working space for the free plunger end with the small cross section works. This means that only a relatively small flow, but with very high pressure can be generated. On the other hand, if the triggerable suction valve opens and closes normally, the pump works simultaneously with both working spaces, so that a large flow rate can be generated, but with relatively low pressure. On the pressure side of the pressure valves of both work spaces, the pressure lines are brought together, so that when the pump is operated at low pressure, the delivery flows emerging from both pump work spaces can be supplied to the consumer together via a single line. Since the pressure valve of the working area accommodating the ring step area of the plunger is generally only designed for relatively low pressures, an additional changeover valve arrangement must be provided which is used during high pressure operation of the pump, i.e. when the suction valve of the work area accommodating the ring step area of the plunger is triggered and is thus continuously open, the pressure valve of this work area shields from the pressure of the flow stream emerging from the other work area.

Diese bekannte Pumpenkonstruktion ist relativ aufwendig, jedenfalls sind im Hinblick auf die Einsatzzwecke derartiger umschaltbarer Pumpen möglichst preiswürdige Konstruktionen erwünscht.This known pump construction is relatively complex; in any case, in view of the uses of such switchable pumps, structures which are as inexpensive as possible are desired.

Deshalb ist es Aufgabe der Erfindung, eine möglichst preisgünstige Plungerpumpe zu schaffen, welche zur Erzeugung eines großen Förderstromes mit geringem Druck bzw. zur Erzeugung eines geringen Förderstromes mit Hochdruck umschaltbar ist.It is therefore an object of the invention to provide a plunger pump which is as inexpensive as possible and which can be switched over to generate a large flow rate at low pressure or to generate a low flow rate at high pressure.

Diese Aufgabe wird bei einer Plungerpumpe der eingangs angegebenen Art dadurch gelöst, daß die beiden Plungerarbeitsräume miteinander durch eine Leitung mit einem in Richtung des Arbeitsraumes des einen Plungers bzw. Plungerteiles schließendem Rückschlagventil verbunden sind, die Saugseite der Pumpe nur über das auslösbare Saugventil mit dem Arbeitsraum des einen Plungers bzw. Plungerteiles verbunden ist und die Druckseite der Pumpe mit dem Plungerarbeitsraum des anderen Plungers bzw. Plungerteiles nur über ein ihm zugeordnetes Druckventil verbunden ist.This object is achieved in a plunger pump of the type specified above in that the two plunger work spaces are connected to one another by a line with a check valve closing in the direction of the work space of a plunger or plunger part, the suction side of the pump only via the triggerable suction valve to the work space one plunger or plunger part is connected and the pressure side of the pump is connected to the plunger work space of the other plunger or plunger part only via a pressure valve assigned to it.

Erfindungsgemäß sind also die Arbeitsräume der beiden unterschiedliche Volumen verdrängenden Plunger bzw. Plungerteile in Reihe hintereinandergeschaltet, d.h. der Förderstrom der Pumpe durchsetzt in jedem Falle beide Arbeitsräume der beiden Plunger bzw. Plungerteile. Aufgrund dieser Anordnung sind für die beiden Arbeitsräume lediglich drei Ventile notwendig. Dabei arbeitet das in der Leitung zwischen den Plungerarbeitsräumen angeordnete Rückschlagventil bei ausgelöstem Saugventil in üblicher Weise als Saugventil des Plungerarbeitsraumes mit dem das geringere Volumen verdrängenden Plunger bzw. Plungerteil, während die Arbeit des anderen Plungers bzw. Plungerteiles aufgrund des ausgelösten Saugventiles unwirksam bleibt und die Pumpe dementsprechend nur mit dem anderen Plunger bzw. Plungerteil wirksam arbeitet.According to the invention, the working spaces of the two plungers or plunger parts displacing different volumes are connected in series, i.e. the flow of the pump passes through both working spaces of the two plungers or plunger parts. Because of this arrangement, only three valves are necessary for the two workrooms. The check valve arranged in the line between the plunger work spaces when the suction valve is triggered works in the usual way as a suction valve of the plunger work space with the plunger or plunger part displacing the smaller volume, while the work of the other plunger or plunger part remains ineffective due to the triggered suction valve and the pump accordingly only works effectively with the other plunger or plunger part.

Sobald die Auslösung des Saugventiles aufgehoben ist und dasselbe in üblicher Weise öffnen und schließen kann, bleibt das Rückschlagventil in der Leitung zwischen den Plungerarbeitsräumen praktisch dauernd geöffnet, da es beim Saughub der beiden Plunger bzw. Plungerteile vom Saugstrom in den Arbeitsraum des das kleinere Volumen verdrängenden Plungers bzw. Plungerteiles und beim Druckhub der Plunger vom Druckstrom aus dem Arbeitsraum des das größere Volumen verdrängenden Plungers bzw. Plungerteiles durchsetzt wird.As soon as the triggering of the suction valve is canceled and can open and close it in the usual way, the non-return valve in the line between the plunger workrooms practically remains open, since during the suction stroke of the two plungers or plunger parts from the suction flow into the workspace of the smaller volume displacing it Plunger or plunger part and during the pressure stroke of the plunger the pressure stream from the working space of the plunger or plunger part displacing the larger volume is penetrated.

Abgesehen davon, daß bei der erfindungsgemäßen Pumpe für die beiden Arbeitsräume der beiden Plunger bzw. Plungerteile nur insgesamt drei Ventile benötigt werden, erübrigen sich auch Umschaltventilanordnungen auf der Druckseite der Pumpe. Denn aufgrund der Hintereinanderschaltung der Arbeitsräume tritt jeweils der gesamte von der Pumpe erzeugte Förderstrom am Druckventil des Arbeitsraumes aus, welcher dem das kleinere Volumen verdrängenden Plunger bzw. Plungerteil zugeordnet ist. Es erübrigt sich also, die Förderströme der beiden Arbeitsräume durch gesonderte Maßnahmen zusammenzufassen bzw. ein Druckventil eines zur Erzeugung eines Förderstromes mit geringem Druck dienenden Arbeitsraumes vor dem gegebenenfalls erzeugten Hochdruck zu schützen.Apart from the fact that only three valves are required in the pump according to the invention for the two working spaces of the two plungers or plunger parts, switchover valve arrangements on the pressure side of the pump are also unnecessary. Because of the series connection of the Working rooms, the entire delivery flow generated by the pump exits at the pressure valve of the working room, which is assigned to the plunger or plunger part displacing the smaller volume. It is therefore unnecessary to summarize the flow rates of the two work spaces by separate measures or to protect a pressure valve of a work space serving to generate a flow rate at low pressure from the high pressure which may be generated.

Gemäß einer besonders bevorzugten Ausführungsform der Pumpe ist vorgesehen, daß die beiden unterschiedliche Volumen verdrängenden Plunger bzw. Plungerteile in zueinander parallelen Arbeitsräumen angeordnet sind, welche in Achsansicht eines die Plunger treibenden Kurbeltriebwerkes bei liegender Anordnung der Plunger übereinander bzw. bei stehender Anordnung der Plunger nebeneinander angeordnet sind. Dabei ist des weiteren zweckmäßigerweise vorgesehen, daß die beiden Plunger bzw. Plungerteile mittels eines gemeinsamen Kreuzkopfes bzw. Schiebers mit einer gemeinsamen, mit dem Kreuzkopf bzw. Schieber durch Pleuel od.dgl. antriebsverbundenen Kröpfung der Kurbelwelle des Kurbeltriebwerkes antriebsgekoppelt sind. Diese Bauweise zeichnet sich durch besondere Kompaktheit aus. Denn einerseits kann die Kurbelwelle relativ kurz bemessen sein. Andererseits lassen sich die beiden Arbeitsräume der Plunger bzw. Plungerteile ohne weiteres in einem Block unterbringen, dessen Höhe bzw. Breite geringer als die Höhe bzw. Breite des Kurbelgehäuses ist.According to a particularly preferred embodiment of the pump, it is provided that the two different volume displacing plungers or plunger parts are arranged in mutually parallel working spaces, which are arranged in an axial view of a crank engine driving the plungers with the plunger lying on top of one another or with the plunger standing up are. It is also expediently provided that the two plungers or plunger parts by means of a common crosshead or slide with a common one, with the crosshead or slide through connecting rods or the like. drive-connected crank crankshaft crank drive are coupled. This design is characterized by its particular compactness. On the one hand, the crankshaft can be dimensioned relatively short. On the other hand, the two working spaces of the plunger or plunger parts can easily be accommodated in a block whose height or width is less than the height or width of the crankcase.

Außerdem zeichnet sich diese Bauweise dadurch aus, daß weitestgehend herkömmliche Teile für Kurbeltrieb, Kreuzköpfe und Plunger verwendet werden können.In addition, this design is characterized in that largely conventional parts can be used for crank mechanisms, crossheads and plungers.

Im übrigen wird hinsichtlich besonders bevorzugter Merkmale der Erfindung auf die Ansprüche sowie die nachfolgende Beschreibung der Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles verwiesen.For the rest, with regard to particularly preferred features of the invention, reference is made to the claims and the following description of the invention with reference to an embodiment shown in the drawing.

In der Zeichnung zeigt die einzige Figur ein stark schematisiertes Schnittbild der erfindungsgemäßen Pumpe.In the drawing, the single figure shows a highly schematic sectional view of the pump according to the invention.

Die dargestellte Pumpe besitzt ein Kurbeltriebwerk 1 mit einem Kurbelgehäuse 2, einer Kurbelwelle 3, Pleueln 4 sowie Kreuzköpfen 5, welche kolbenartig in Kreuzkopfführungen 6 verschiebbar angeordnet sind und beim Umlauf der Kurbelwelle 3 in bekannter Weise Hubbewegungen ausführen.The pump shown has a crank mechanism 1 with a crankcase 2, a crankshaft 3, connecting rods 4 and crossheads 5, which are displaceably arranged in piston-like manner in crosshead guides 6 and carry out lifting movements in a known manner when the crankshaft 3 rotates.

Jeder Kreuzkopf 5 ist mit jeweils zwei Plungern 7 und 8 verbunden, welche innerhalb zugeordneter Plungerarbeitsräume 9 und 10 angeordnet sind, die ihrerseits als Teile eines mit dem Kurbelgehäuse 2 verbundenen Zylinderblockes 11 angeordnet sind. Die Plunger 7 und 8 sind in bekannter Weise in Dichtungsanordnungen 12 an den kreuzkopfseitigen Enden der Plungerarbeitsräume 9 und 10 geführt, um die Plungerarbeitsräume 9 und 10 zu den Kreuzköpfen 5 hin abzudichten. Der in der Figur obere Plunger 8 besitzt einen geringeren Querschnitt als der untere Plunger 7. Dementsprechend verdrängen die Plunger 7 und 8 bei ihren Hüben unterschiedliche Medienmengen.Each crosshead 5 is connected to two plungers 7 and 8, which are arranged within associated plunger work spaces 9 and 10, which in turn are arranged as parts of a cylinder block 11 connected to the crankcase 2. The plungers 7 and 8 are guided in a known manner in sealing arrangements 12 at the ends of the plunger work spaces 9 and 10 on the crosshead side in order to seal the plunger work spaces 9 and 10 towards the crossheads 5. The upper plunger 8 in the figure has a smaller cross section than the lower plunger 7. Accordingly, the plungers 7 and 8 displace different amounts of media during their strokes.

Auf der von den Kreuzköpfen 5 abgewandtep Seite ist der Zylinderblock 11 mit einem Ventilblock 13 verbunden, welcher für die beiden Plungerarbeitsräume 9 und 10 insgesamt drei Ventile aufweist, und zwar ein den Plungerarbeitsraum 9 mit der Saugseite bzw. einer nicht dargestellten Saugleitung der Pumpe verbindendes Saugventil 14, ein zwischen den Plungerarbeitsräumen 9 und 10 angeordnetes, nur eine Strömung in Richtung des Plungerarbeitsraumes 10 zulassendes Rückschlagventil 15 sowie ein vom Plungerarbeitsraum 10 zur Druckseite bzw. einer nicht dargestellten Druckleitung der Pumpe führendes Druckventil 16. Die Ventile 14 bis 16 sind schematisiert als Kugelventile dargestellt, grundsätzlich sind jedoch auch andere Ventilkonstruktionen möglich und in der Regel auch zweckmäßig.On the side facing away from the cross heads 5, the cylinder block 11 is connected to a valve block 13 which has a total of three valves for the two plunger work spaces 9 and 10, namely a suction valve connecting the plunger work space 9 with the suction side or a suction line (not shown) of the pump 14, a check valve 15 arranged between the plunger work spaces 9 and 10 and allowing only a flow in the direction of the plunger work space 10, and a pressure valve 16 leading from the plunger work space 10 to the pressure side or a pressure line (not shown) of the pump. The valves 14 to 16 are schematized as ball valves shown, in principle, however, other valve constructions are possible and generally also useful.

Das Saugventil 14 ist auslösbar ausgebildet, d.h. mittels eines Stößels 17 kann der Ventilkörper des Saugventiles 14 dauernd in Offenstellung gehalten werden. Weitere Ventile werden für die Plungerarbeitsräume 9 und 10 nicht benötigt.The suction valve 14 is designed to be triggered, i.e. The valve body of the suction valve 14 can be kept permanently in the open position by means of a tappet 17. Additional valves are not required for plunger rooms 9 and 10.

Die dargestellte Pumpe arbeitet wie folgt:

  • Zunächst wird davon ausgegangen, daß der Stö-Bel 17 des Saugventiles 14 seine in Fig. 1 nach unten verschobene Lage einnimmt, derart, daß das Saugventil 14 nicht ausgelöst ist und in üblicher Weise nach Art eines Rückschlagventiles öffnen und schließen kann.
The pump shown works as follows:
  • First of all, it is assumed that the fault 17 of the suction valve 14 assumes its position shifted downward in FIG. 1 in such a way that the suction valve 14 is not triggered and can open and close in the usual manner in the manner of a check valve.

Wenn sich die Plunger 7 und 8 im Saughub in Fig. 1 nach links bewegen, so füllen sich die Plungerarbeitsräume 9 und 10 mit Pumpmedium, welches durch die im Saughub öffnenden Ventile 14 und 15 zuströmt, wobei das Saugventil 14 von der Summe der in die Plungerarbeitsräume 9 und 10 eindringenden Ströme und das Rückschlagventil 15 nur von dem in den Plungerarbeitsraum 10 einfließenden Strom durchsetzt werden. Während dieser Phase bleibt das Druckventil 16 geschlossen, weil im Plungerarbeitsraum 10 nur der gegenüber der Druckseite der Pumpe verminderte Druck auf der Saugseite der Pumpe bzw. ein geringfügig darunter liegender Druck vorliegt.If the plungers 7 and 8 move to the left in the suction stroke in FIG. 1, the plunger working spaces 9 and 10 fill with pump medium which flows in through the valves 14 and 15 opening in the suction stroke, the suction valve 14 being different from the sum of the Plunger work rooms 9 and 10 penetrating currents and the check valve 15 are only penetrated by the current flowing into the plunger work room 10. During this phase, the pressure valve 16 remains closed, because in the plunger work space 10 there is only the pressure on the suction side of the pump which is reduced compared to the pressure side of the pump or a pressure slightly below it.

Wenn sich die Plunger 7 und 8 im Druckhub in Fig. 1 nach rechts bewegen, so schließt das Saugventil 14, während das Rückschlagventil 15 geöffnet bleibt bzw. erneut zusammen mit dem nunmehr öffnenden Druckventil 16 in Offenstellung gebracht wird, weil der Plunger 7 nunmehr Medium aus dem Plungerarbeitsraum 9 und der Plunger 8 Medium aus dem Plungerarbeitsraum 10 verdrängen. Dementsprechend wird das Rückschlagventil 15 von den aus dem Plungerarbeitsraum 9 ausströmenden Medium durchsetzt, während durch das Druckventil 16 die Summe der aus den Plungerarbeitsräumen 9 und 10 austretenden Mengen des Pumpmediums strömt.If the plungers 7 and 8 move to the right in the pressure stroke in FIG. 1, the suction valve 14 closes, while the check valve 15 remains open or is again brought into the open position together with the now opening pressure valve 16 because the plunger 7 is now medium displace medium from the plunger work space 10 from the plunger work space 9 and the plunger 8. Accordingly, the check valve 15 is traversed by the medium flowing out of the plunger work space 9, while the pressure valve 16 flows through the sum of the quantities of the pump medium emerging from the plunger work spaces 9 and 10.

Bei der oben beschriebenen Betriebsweise handelt es sich um den Niederdruckbetrieb, weil die Pumpe mit beiden Plungern 7 und 8 und damit mit einem relativ großen Plungerquerschnitt arbeitet. Wenn die Pumpe im Hochdruckbetrieb arbeiten soll, wird das Saugventil 14 durch entsprechende Betätigung des Stößels 17 ausgelöst und damit dauernd in Offenstellung gehalten. Dementsprechend kann der Plunger 7 keine Pumparbeit leisten, vielmehr wird das von ihm im Saughub angesogene Medium beim Druckhub wieder durch das Saugventil 14 zur Saugseite der Pumpe zurückgefördert. Wirksame Pumparbeit vermag nur der Plunger 8 zu leisten, denn nun arbeitet das Rückschlagventil 15 nach Art eines herkömmlichen Saugventiles, d.h. das Rückschlagventil 15 öffnet im Saughub des-Plungers 8 und schließt bei dessen Druckhub, da im Plungerarbeitsraum 9 aufgrund des dauernd geöffneten Saugventiles 14 nur ein gegenüber dem Druck im Plungerarbeitsraum 10 verminderter Druck etwa entsprechend dem saugseitigen Druck der Pumpe vorliegen kann. Im übrigen öffnet sich beim Druckhub des Plungers 8 das Druckventil 16 unter dem Einfluß des vom Plunger 8 verdrängten Mediums. Da in dieser Phase die Pumpe nur mit dem Plunger 8 wirksame Pumparbeit leisten kann und mit einem relativ geringen Plungerquerschnitt arbeitet, lassen sich ohne Erhöhung der die Kurbelwelle 3 antreibenden Leistung eines Antriebsaggregates sehr hohe Drucke erzeugen.The mode of operation described above is low-pressure operation because the pump works with both plungers 7 and 8 and thus with a relatively large plunger cross section. If the pump is to operate in high pressure mode, the suction valve 14 is triggered by corresponding actuation of the tappet 17 and is thus kept in the open position continuously. Accordingly, the plunger 7 cannot do any pumping work, rather the medium sucked in by him in the suction stroke during the pressure stroke is conveyed back through the suction valve 14 to the suction side of the pump. Only the plunger 8 can perform effective pumping work, because the check valve 15 now works in the manner of a conventional suction valve, ie the check valve 15 opens in the suction stroke of the plunger 8 and closes on its pressure stroke, since in the plunger work space 9 due to the permanently open suction valve 14 only a reduced pressure compared to the pressure in the plunger work space 10 may be approximately corresponding to the suction-side pressure of the pump. Otherwise, the pressure valve 16 opens during the pressure stroke of the plunger 8 under the influence of the medium displaced by the plunger 8. Since in this phase the pump can only perform effective pumping work with the plunger 8 and works with a relatively small plunger cross-section, very high pressures can be generated without increasing the power of a drive unit which drives the crankshaft 3.

Eine Besonderheit der dargestellten Pumpe liegt also in der Hintereinanderschaltung der Plungerarbeitsräume 9 und 10, d.h. das gesamte von den Plungem 7 und 8 zur Druckseite geförderte Medium durchsetzt nacheinander die Plungerarbeitsräume 9 und 10. Dadurch werden trotz der zwei Plungerarbeitsräume 9 und 10 lediglich drei Ventile 14 bis 16 benötigt, wobei aufgrund der Auslösbarkeit des Saugventiles 14 jederzeit eine Umschaltung von Niederdruckbetrieb auf Hochdruck betrieb möglich ist. Weitere Maßnahmen sind zur Umschaltung nicht notwendig.A special feature of the pump shown is the series connection of the plunger work rooms 9 and 10, i.e. the entire medium conveyed by the plungers 7 and 8 to the pressure side passes through the plunger work spaces 9 and 10 in succession. As a result, despite the two plunger work spaces 9 and 10, only three valves 14 to 16 are required, with a switch from low pressure operation to at any time due to the triggerability of the suction valve 14 High pressure operation is possible. No further measures are necessary to switch over.

Der nur schematisiert dargestellte Kreuzkopf 5 besteht im wesentlichen aus zwei gleichachsig zu den Plungem 7 und 8 angeordneten Stangenteilen 18 mit kreisförmigem Querschnitt, wobei die Stangenteile 18 gegebenenfalls zur Gewichtsverminderung rohrartig hohl sein können. Die Stangenteile 18 sind separat in Führungsbuchsen 19 gleitverschiebbar gelagert, welche in passenden Zylinderbohrungen des Kurbelgehäuses 2 angeordnet sind. Kurbelwellenseitig sind die Stangenteile 18 mittels eines Joches 20 ohne Verschiebbarkeit relativ zueinander in Längsrichtung verbunden. Das Joch 20 ist seinerseits gelenkig mit dem Pleuel 4 gekoppelt.The cross head 5, shown only schematically, consists essentially of two rod parts 18 with a circular cross section, which are arranged coaxially with the plungers 7 and 8, the rod parts 18 possibly being hollow to reduce weight. The rod parts 18 are separately slidably mounted in guide bushings 19, which are arranged in suitable cylinder bores of the crankcase 2. On the crankshaft side, the rod parts 18 are connected in the longitudinal direction by means of a yoke 20 without being displaceable relative to one another. The yoke 20 is in turn articulated to the connecting rod 4.

Die vom Joch 20 abgewandten Enden der Stangenteile 18 sind in grundsätzlich bekannter Weise wie bei herkömmlichen Pumpen mit den Plungern 7 und 8 lösbar verbunden, wobei die Plunger 7 und 8 insbesondere relativ zu den Stangenteilen 18 eine begrenzte Winkelbeweglichkeit aufweisen können, so daß Montagetoleranzen bei der Ausrichtung von Kurbelgehäuse 2 und Zylinderblock 11 unproblematisch sind.The ends of the rod parts 18 facing away from the yoke 20 are releasably connected in a generally known manner to the plungers 7 and 8 as in conventional pumps, the plungers 7 and 8 being able to have a limited angular mobility, in particular relative to the rod parts 18, so that assembly tolerances in the Alignment of crankcase 2 and cylinder block 11 are unproblematic.

Der Vorteil der dargestellten Anordnung besteht vor allem darin, daß für alle beweglichen Teile praktisch herkömmliche Pumpenteile verwendet werden können.The advantage of the arrangement shown is above all that practically conventional pump parts can be used for all moving parts.

Die Erfindung ist nicht auf Plungerpumpen im engeren Sinne beschränkt. Anstelle der dargestellten Plunger können auch andere Verdrängeranordnungen vorgesehen sein. An der Anordnung der Ventile 14 bis 16 ändert sich dadurch im Prinzip nichts.The invention is not restricted to plunger pumps in the narrower sense. Instead of the plungers shown, other displacement arrangements can also be provided. In principle, this does not change the arrangement of the valves 14 to 16.

Im übrigen sind Abwandlungen der dargestellten Ausführungsform möglich. So ist es grundsätzlich auch möglich, die Plungerarbeitsräume 9 und 10 in Achsrichtung der Kurbelwelle 3 in Reihe hintereinander anzuordnen und jeden Plunger direkt oder über einen gesonderten Kreuzkopf mit einer separaten Kröpfung der Kurbelwelle 3 antriebsmäßig zu koppeln.Otherwise, modifications of the illustrated embodiment are possible. In principle, it is also possible to arrange the plunger work spaces 9 and 10 one after the other in the axial direction of the crankshaft 3 and to drive-connect each plunger directly or via a separate crosshead with a separate cranking of the crankshaft 3.

Grundsätzlich ist es des weiteren auch möglich, beide Plunger 7 und 8 mit gleichen Querschnitten anzuordnen und die pro Hub unterschiedlichen verdrängten Mengen dadurch zu erzielen, daß die Plunger unterschiedlich große Hübe ausführen, beispielsweise indem in Reihe angeordnete Plunger mit unterschiedlich bemessenen Kröpfungen der Kurbelwelle antriebsgekoppelt sind.Basically, it is also possible to arrange both plungers 7 and 8 with the same cross-sections and to achieve the different displaced quantities per stroke in that the plungers carry out strokes of different sizes, for example by driving-coupled plungers with differently dimensioned crankshaft crankshafts .

Im übrigen lassen sich die Ventile 14 bis 16 auch bei der eingangs beschriebenen bekannten Pumpe in entsprechender Weise anordnen, so daß der den Ringstufenbereich des Plungers aufnehmende Arbeitsraum in Reihe dem anderen Arbeitsraum vorgeschaltet ist, welcher das freie Plungerende mit geringerem Querschnitt aufnimmt. Allerdings ist eine derartige Pumpenkonstruktion wegen der großen Abmessung in Längsrichtung des Plungers in der Regel weniger zweckmäßig. Im übrigen besteht bei derartigen Pumpen ein gewisser Nachteil darin, daß eine Plungerdichtung zwischen den beiden Plungerarbeitsräumen angeordnet sein muß und deshalb bei Niederdruckbetrieb der Pumpe, wenn der stufenförmige Plunger in beiden Arbeitsräumen wirksam arbeitet, nur durch allenfalls ganz geringfügige Druckdifferenzen belastet ist, und zwar insbesondere im Druckhub. Derartiges ist aber im Hinblick auf eine gute Dichtwirkung unerwünscht, wie sie vor allem beim Hochdruckbetrieb benötigt wird, wenn der Plunger nur mit seinem freien, den geringen Querschnitt aufweisenden Ende wirksame Pumparbeit verrichtet.In addition, the valves 14 to 16 can also be arranged in a corresponding manner in the known pump described at the outset, so that the working space receiving the annular step region of the plunger is connected in series to the other working space, which takes up the free plunger end with a smaller cross section. However, such a pump construction is generally less useful because of the large dimension in the longitudinal direction of the plunger. In addition, there is a certain disadvantage with such pumps that a plunger seal must be arranged between the two plunger work spaces and is therefore only at very low pressure differences, especially when the pump is operated at low pressure when the stepped plunger works effectively in both work spaces in the pressure stroke. Such is undesirable in view of a good sealing effect, as is required above all in high-pressure operation, when the plunger does effective pumping work only with its free end, which has a small cross section.

Die erfindungsgemäße Pumpe kann gegebenenfalls auch mit Vorteil als Regelpumpe eingesetzt werden. Je nachdem, ob das Saugventil 14 ausgelöst ist oder nicht, arbeitet dann die Pumpe wirksam mit beiden Plungern 7 und 8 oder nur mit dem Plunger 8. Dabei kann die Pumpe in beiden Betriebszuständen des Saugventiles druckseitig gegen einen gleichbleibenden Druck arbeiten, so daß die Pumpe je nach dem wirksam arbeitenden Plungerquerschnitt (bei ausgelöstem Saugventil 14 der Querschnitt des Plungers 8; bei nicht ausgelöstem Saugventil 14 die Summe der Querschnitte der Plunger 7 und 8) mit entsprechend unterschiedlichen Fördermengen und Leistungen arbeitet.The pump according to the invention can optionally also be used advantageously as a control pump. Depending on whether the suction valve 14 is triggered or not, the pump then works effectively with both plungers 7 and 8 or only with the plunger 8. The pump can work in both operating states of the suction valve on the pressure side against a constant pressure, so that the pump depending on the effective plunger cross section (when the suction valve 14 is triggered, the cross section of the plunger 8; when the suction valve 14 is not triggered, the sum of the cross sections of the plungers 7 and 8) operates with correspondingly different delivery rates and outputs.

Im übrigen kann die erfindungsgemäße Pumpe gegebenenfalls zur Erzielung eines besonders großen Förderstromes bei relativ geringem Druck umgerüstet werden.In addition, the pump according to the invention can optionally be converted to achieve a particularly large flow rate at a relatively low pressure.

Grundsätzlich kann zwar jede Pumpe zur Erzielung einer besonders großen Fördermenge bei geringem Druck abgeändert werden, indem Plunger mit vergrößertem Querschnitt angeordnet werden, wobei in der Regel auch die Plungerarbeitsräume aufgebohrt werden müssen, um die veränderten Plunger anordnen zu können. Eine solche Abänderung einer Pumpe ist aber nur in begrenztem Umfange möglich, weil aufgrund des jeweils durch das Kurbeltriebwerk vorgegebenen Stichmaßes, d.h. den Abstand der Plungerachsen bzw. Kurbelkröpfungen in Achsrichtung der Kurbelwelle, ein maximal möglicher Plungerdurchmesser vorgegeben wird.In principle, each pump can be modified to achieve a particularly large delivery rate at low pressure by arranging plungers with an enlarged cross-section, with the plunger working spaces also generally having to be drilled out in order to be able to arrange the changed plungers. Such a modification of a pump is, however, only to a limited extent possible because a maximum possible plunger diameter is specified based on the pitch dimension given by the crank engine, ie the distance of the plunger axes or crank crankings in the axial direction of the crankshaft.

Bei der erfindungsgemäßen Pumpe kann jedoch aufgrund des relativ großen u-Abstandes der Achsen der Plunger 7 und 8 der Durchmesser des Plungers 8 erheblich vergrößert werden, in der Regel zumindest auf das Maß des Plungers 7, d.h. der Zylinderblock 11 läßt die Anordnung eines deutlich größeren Plungers 8 sowie eines Arbeitsraumes 10 mit entsprechend vergrößertem Querschnitt zu. Damit kann aber gegebenenfalls eine Pumpe mit außerordentlich hohem Mengendurchsatz erzielt werden, wobei die Auslösevorrichtung 17 für das Saugventil 14 sowie das Rückschlagventil 15 zwischen den Plungerarbeitsräumen 9 und 10 erübrigt werden können. Es genügt also lediglich eine anstelle des Rückschlagventiles 15 angeordnete, dauernd geöffnete Verbindungsleitung zwischen den Plungerarbeitsräumen 9 und 10.In the pump according to the invention, however, due to the relatively large u-spacing of the axes of the plungers 7 and 8, the diameter of the plunger 8 can be increased significantly, usually at least to the size of the plunger 7, i.e. the cylinder block 11 allows the arrangement of a significantly larger plunger 8 and a working space 10 with a correspondingly enlarged cross section. However, if necessary, a pump with an extremely high flow rate can thereby be achieved, whereby the triggering device 17 for the suction valve 14 and the check valve 15 between the plunger work spaces 9 and 10 can be dispensed with. All that is needed is a permanently open connection line between the plunger work rooms 9 and 10, which is arranged instead of the check valve 15.

Anstelle des in der Figur dargestellten Kreuzkopfes 5 mit zwei Führungsstangen 18 kann auch ein einteiliger Kreuzkopf mit großem, gegebenenfalls ovalem Querschnitt angeordnet und unmittelbar mit den Plungern 7 und 8 sowie dem Pleuel 4 verbunden werden. Bei einer solchen Bauweise erübrigt sich das Joch 20.Instead of the crosshead 5 shown in the figure with two guide rods 18, a one-piece crosshead with a large, possibly oval cross section can also be arranged and connected directly to the plungers 7 and 8 and the connecting rod 4. With such a construction, the yoke 20 is unnecessary.

Claims (6)

1. Plunger pump comprising at least two plunger working chambers and also plungers or plunger parts associated with the latter which operate in phase and which displace during their in phase strokes the same or different quantities of the pump medium, and also a releasable suction valve which is associated with the working chamber of the plunger or plunger part which displaces the larger volume and which remains permanently in the open position in the released state so that when the suction valve is released the pump can generate a low displacement flow at high pressure by means of the other plunger or plunger part which displaces the smaller volume and, when the suction valve is working, can generate a large displacement flow at low pressure by means of the working of the two plungers or plunger parts with an unchanged power requirement of the pump, characterised in that the two plunger working chambers (9, 10) are connected together through a duct with a non-return valve which closes in the direction of the working chamber (9) of the one plunger or plunger part, in that the suction side of the pump is only connected with the working chamber of the one plunger (7) or plunger part via the releasable suction valve (14) and in that the pressure side of the pump is connected with the plunger working chamber (10) of the other plunger (8) or plunger part only via a pressure valve (16) associated therewith.
2. Pump in accordance with claim 1, characterised in that the plunger (7, 8) or plunger parts execute the same strokes.
3. Pump in accordance with claim 2, characterised in that the two plungers (7, 8) or plunger parts which are arranged in mutually parallel working chambers (9, 10) and are driven by a crank driving mechanism (1) are coupled drive-wise by means of a common cross head (5) or slider or the like with a common throw of the crank shaft (3) of the crank driving mechanism (1) which is connected drive-wise with the cross head (5) -or slider - for example by connecting rods (4).
4. Pump in accordance with claim 3, characterised in that the cross head (5) has two rod parts (18) which are separately slidably displaceably guided in the crank housing (3) which are arranged coaxial to the plungers (7, 8) associated with the cross head and which are fixedly connected at the crank shaft side by means of yoke (20) to which in turn the cross head end of a connecting rod (4) is pivotally connected.
5. Pump in accordance with one of the claims 1 to 4, characterised in that in each case two plunger working chambers (9, 10), in which plungers (7, 8) operate which displace different quantities, are arranged alongside one another mutually in parallel horizontally above one another or vertically alongside one another in an axial view of the crank driving mechanism (1).
6. Use of a pump in accordance with one of the claims 1 to 5 as a regulating pump which can be switched over to different displacement quantities and/or displacement powers by release of the suction valve (14).
EP88101593A 1987-03-03 1988-02-04 Plunger pump Expired - Lifetime EP0280901B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3706785 1987-03-03
DE19873706785 DE3706785A1 (en) 1987-03-03 1987-03-03 PLUNGER PUMP

Publications (3)

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EP0280901A2 EP0280901A2 (en) 1988-09-07
EP0280901A3 EP0280901A3 (en) 1988-12-21
EP0280901B1 true EP0280901B1 (en) 1990-02-07

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ID=6322168

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EP88101593A Expired - Lifetime EP0280901B1 (en) 1987-03-03 1988-02-04 Plunger pump

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EP (1) EP0280901B1 (en)
JP (1) JPS63230967A (en)
DE (2) DE3706785A1 (en)
ES (1) ES2012506B3 (en)

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Publication number Priority date Publication date Assignee Title
JP5972625B2 (en) * 2012-03-23 2016-08-17 住友重機械工業株式会社 Fluid pressure booster
DE102012224308A1 (en) * 2012-12-21 2014-06-26 Continental Automotive Gmbh high pressure pump
DE102013223488A1 (en) * 2013-11-18 2015-05-21 Robert Bosch Gmbh Fuel injection pump for an internal combustion engine
CN109826772B (en) * 2019-04-03 2024-05-28 四川轻化工大学 Continuous flow injection pump system and control method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1322236A (en) * 1919-11-18 oe modesto
AT8837B (en) * 1900-12-10 1902-08-25 Henry Turner Air or liquid pump.
FR1180560A (en) * 1956-08-03 1959-06-05 Dobson Ltd W E & F Improvements to hydraulic pumps
US3311065A (en) * 1964-10-15 1967-03-28 Plastering Dev Ct Inc Pumping apparatus
DD64353A1 (en) * 1967-10-06 1968-10-20 Manfred Thierfelder Piston pump with several pressure stages
US4245963A (en) * 1979-02-09 1981-01-20 Waters Associates, Inc. Pump
JPH0437270Y2 (en) * 1984-12-05 1992-09-02
JPH0442530Y2 (en) * 1985-02-25 1992-10-07

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DE3706785A1 (en) 1988-09-15
ES2012506B3 (en) 1990-04-01
JPS63230967A (en) 1988-09-27
DE3860037D1 (en) 1990-03-15
EP0280901A3 (en) 1988-12-21
EP0280901A2 (en) 1988-09-07

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