EP0744546A1 - Pump device for cryogenic fluids - Google Patents

Pump device for cryogenic fluids Download PDF

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Publication number
EP0744546A1
EP0744546A1 EP96810311A EP96810311A EP0744546A1 EP 0744546 A1 EP0744546 A1 EP 0744546A1 EP 96810311 A EP96810311 A EP 96810311A EP 96810311 A EP96810311 A EP 96810311A EP 0744546 A1 EP0744546 A1 EP 0744546A1
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EP
European Patent Office
Prior art keywords
piston
pressure
compressor
pump device
pump
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Granted
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EP96810311A
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German (de)
French (fr)
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EP0744546B1 (en
Inventor
Jean Tornare
Philippe Drouvot
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Fives Cryomec AG
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Cryomec AG
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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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points

Definitions

  • the present invention relates to a pumping device for cryogenic fluids according to the preamble of patent claim 1.
  • a pump operating on the same principle is known from CH-A-663'065, but is of simpler construction and can be manufactured more cost-effectively.
  • This pumping device which is shown in FIG. 1, likewise has a high-pressure part and a pre-compressor part, which are, however, separated by a partition.
  • the pre-compressor part is accommodated in a heat-insulated fluid or intermediate container 5.
  • the high-pressure part and the pre-compressor part comprise two separate piston pumps 1, 2, which are arranged in tandem and which have a common piston rod 8 which passes through the partition wall 3 in a sliding and sealed manner (32).
  • the pre-compressor part has a cylinder 10 which is open on the suction side.
  • the pre-compression piston 11 has passage openings 17, which are closed by a valve plate 12 during the charging stroke or pre-compression, while they are open in the pressure stroke.
  • the dividing wall 3 is penetrated by suction openings 33 which connect the pre-compression chamber 16 to the high-pressure chamber 26.
  • suction openings 33 are closed by a valve plate 34 arranged in the high-pressure part and opened in the loading stroke.
  • the pump device according to the invention has essentially the same structure as the pump device known from CH-A-663'065 and works on the same principle.
  • the high-pressure and low-pressure parts are more separated from one another and are only connected to one another by suction openings or suction channels.
  • the two separate piston rods eliminate the seal in the transition from the low-pressure to the high-pressure area, so that the properties of such a seal no longer have to be taken into account when working at higher pressures. Since the piston rods are driven synchronously, the pump device can still function properly.
  • the movements of the piston rods are mechanically synchronized.
  • the piston rod of the precompressor part is arranged entirely within a fluid container, it being connected to the high-pressure piston rod by means of a connecting rod, which likewise runs in the fluid container. The connection is also completely in the low pressure range, so that the seals do not have to be so demanding.
  • the low-pressure piston rod protrudes from the fluid container and the mechanical connection takes place outside the fluid container by means of drive rods offset parallel to the piston axes.
  • the low-pressure piston rod is in turn provided with a low-pressure seal in the fluid container / environment transition. This structure has special advantages: the low pressure seal is easily accessible.
  • FIG. 1 a pumping device for cryogenic fluids according to the prior art is shown in simplified form, by means of which the working principle of the pump can be seen, which is also described in detail in CH-A-663'065.
  • FIG. 2 shows a preferred embodiment of the pump device improved according to the invention.
  • the pump device likewise comprises a pre-compressor part and a high-pressure part, the high-pressure part comprising a high-pressure piston pump 2 and the pre-compressor part a low-pressure piston pump 1, also referred to below as a pre-compressor pump.
  • the piston pumps are at least partially surrounded by a fluid container 5, which itself is in turn by means of an insulation jacket 6 is thermally insulated from the environment.
  • an insulation jacket 6 is thermally insulated from the environment.
  • a double wall surrounding the fluid container 5, in which vacuum prevails serves as the insulation jacket 6.
  • the fluid container 5 has a feed opening 50 through which the fluid enters the container.
  • a closable expansion opening 51 is provided, which leads from the container to the outside and which is used to discharge any gas bubbles that may arise.
  • the low-pressure piston pump 1 has a fixed cylinder 10 which is located entirely within the fluid container 5.
  • the cylinder 10 has essentially the shape of a tube open on the suction side, which is partially penetrated by a pre-compressor piston rod 13 and in which a pre-compressor piston 11 connected to the pre-compressor piston rod 13 is held displaceably.
  • the pre-compression piston 11 has at least one passage opening 17 which connects the fluid container 5 to the pre-compression chamber 16. This opening is closed by means of a valve plate 12 during the pre-compression or loading stroke.
  • this valve plate 12 is arranged inside the precompression chamber on the side of the piston facing away from the passage opening. In Figure 2, the valve plate 12 is shown in the open position.
  • the end of the pre-compressor piston rod 13 extends out of the fluid container 5 in a sealed manner (FIG. 14).
  • the end near the piston is located within the pre-compression chamber 16.
  • the seals 14 are located in an elongated attachment 52 on the fluid container 5 so that they are easily accessible.
  • the attachment 52 comprises an adjustable sleeve 52 ', by means of which the seals 14 can be adjusted by being pressed together to different degrees by the sleeve 52'.
  • the high-pressure piston pump 2 likewise has a cylinder 20, through which a high-pressure piston rod 23 passes and in which a high-pressure piston 24 connected to the high-pressure piston rod 23 is held displaceably.
  • the high pressure piston 21 is provided with sealing rings 21 '. These sealing rings seal the high pressure area from the remaining cylinder 20. In the area remote from the piston, a return spring 25 and an additional low-pressure seal 24 are arranged in the cylinder 20.
  • the high-pressure area of the high-pressure piston pump is located within the fluid container 5 and is therefore also surrounded by the insulation jacket 6.
  • At the end of the sealing rings 21 ′ remote from the piston there can be at least one bore 28 in the cylinder 20, which leads the fluid back into the fluid container 5 in the event of leakages.
  • a pressure line 4 leads away from the high pressure chamber 26, the outlet opening of the high pressure chamber being provided with a check valve 41.
  • the cylinder 20 of the high pressure pump 2 is closed at its piston end except for at least one suction opening 27.
  • the suction opening 27 is closed in the pressure stroke by a valve body 22 and open in the loading stroke.
  • the valve body 22 is arranged outside the cylinder and has at least one intake duct 30 and one expansion duct 31.
  • the at least one suction channel 30 connects the pre-compression chamber 16 to the high-pressure chamber 26.
  • the rising gas bubbles collect in the expansion channel 31 and are directed into the fluid container, so that liquid fluid can be conveyed almost exclusively.
  • the two piston rods 13, 23 of the pre-compressor pump 1 and the high pressure pump 2 are driven synchronously in tandem.
  • the drive can be synchronized in various ways, mechanically or electronically.
  • Mechanical synchronization means are used in these exemplary embodiments.
  • These drive rods 70 are connected to the ends remote from the piston of both the pre-compression piston rod 13 and the high-pressure piston rod 23 by means of transverse rods 71 arranged at least approximately at right angles thereto.
  • These mechanical synchronization means can also be mounted on existing pumping devices and are easily adjustable.
  • the crossbars can also form a different angle with the drive rods.
  • FIG. 3 shows a second preferred exemplary embodiment of the pump device according to the invention, of essentially the same structure as that in FIG. 2.
  • the pre-compression piston rod 13 is here axially offset from the high-pressure piston rod 23. It is located completely within the fluid container 5 and does not protrude this out.
  • the pre-compression piston rod 13 is in turn sealed against the fluid container (14 ').
  • the piston rod 13 now passes through the low pressure cylinder 10 on two sides.
  • the valve plate 12 is on the other side of the piston 11 than in the example in FIG. 2 and is fixedly connected to the piston rod, but the piston 11 is movable.
  • the solutions for the pre-compressor pump shown in FIGS. 1 and 2 are interchangeable.
  • the end of the pre-compression piston rod 13 remote from the piston is in turn connected to the high-pressure piston rod 23 by means of mechanical synchronization means, which, however, run entirely within the fluid container.
  • These means here comprise a connecting rod 72 which runs at least approximately in the vertical plane to the piston axes, is connected on the one hand to the pre-compression piston rod 13 and on the other hand penetrates the high-pressure piston rod 23 in the area behind the sealing rings 21 ', that is to say in the low-pressure area.
  • the cylinder 20 of the high-pressure piston pump 2 has a recess 29 along its axis, which enables the connecting rod 72 to run with the piston rods 13, 23. It is possible to connect several pre-compressor pumps to the same high pressure pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

The high pressure part incorporates a high pressure piston pump (2) and the pre-compressor part at least one pre-compressor piston pump (1). The two pumps are arranged in tandem and are synchronously operated. Each piston pump has a connecting rod (13,23), which at least in the area of the dividing wall (3) is completely separated from the other connecting rod. The drive of the piston connecting rods is electronically synchronised, or by mechanical devices (70,71). The connecting rods lie on a common axis. The mechanical devices incorporate at least one drive rod (70), which is displaced axially to the high pressure piston connecting rod and is connected with the high pressure and the pre-compressor piston connecting rods.

Description

Die vorliegende Erfindung betrifft eine Pumpvorrichtung für cryogene Fluide gemäss Oberbegriff des Patentanspruches 1.The present invention relates to a pumping device for cryogenic fluids according to the preamble of patent claim 1.

An Pumpen von cryogenen Flüssigkeiten werden spezielle Anforderungen gestellt. Ein Problem dieser Pumpen ist, dass beim Absinken und Ansteigen des Druckes unerwünschte Aenderungen im Aggregatszustand eintreten, wodurch der Wirkungsgrad der Pumpen verringert wird.Pumps of cryogenic liquids have special requirements. One problem with these pumps is that when the pressure drops and rises, undesirable changes occur in the aggregate state, which reduces the efficiency of the pumps.

Aus CH-A-615'982 ist eine Pumpvorrichtung bekannt, die dieses Problem löst, indem das Fluid durch Vorverdichtung auf einen Druck über den Dampfdruck angehoben wird, bevor es in die Hochdruckkammer gepumpt wird. Diese Pumpvorrichtung weist jedoch ein aufwendiges Ventilsystem auf und ist deshalb teuer in der Herstellung.From CH-A-615'982 a pump device is known which solves this problem by raising the fluid to a pressure above the vapor pressure by means of pre-compression before it is pumped into the high pressure chamber. However, this pump device has a complex valve system and is therefore expensive to manufacture.

Eine nach dem gleichen Prinzip arbeitende Pumpe ist aus CH-A-663'065 bekannt, die jedoch einfacher aufgebaut ist und kostengünstiger hergestellt werden kann. Diese Pumpvorrichtung, die in Figur 1 dargestellt ist, weist ebenfalls einen Hochdruck- und einen Vorverdichterteil auf, die jedoch durch eine Trennwand getrennt sind. Der Vorverdichterteil ist in einem wärmeisolierten Fluid- oder Zwischenbehälter 5 untergebracht. Der Hochdruck- und der Vorverdichterteil umfassen zwei voneinander getrennte Kolbenpumpen 1,2, die im Tandem angeordnet sind und die eine gemeinsame, die Trennwand 3 gleitend und abgedichtet (32) durchsetzende Kolbenstange 8 aufweisen. Der Vorverdichterteil weist einen Zylinder 10 auf, der saugseitig offen ist. Der Vorverdichterkolben 11 weist Durchlassöffnungen 17 auf, die während des Ladehubes oder Vorverdichtens durch eine Ventilplatte 12 geschlossen sind, während sie im Druckhub geöffnet sind.A pump operating on the same principle is known from CH-A-663'065, but is of simpler construction and can be manufactured more cost-effectively. This pumping device, which is shown in FIG. 1, likewise has a high-pressure part and a pre-compressor part, which are, however, separated by a partition. The pre-compressor part is accommodated in a heat-insulated fluid or intermediate container 5. Of the The high-pressure part and the pre-compressor part comprise two separate piston pumps 1, 2, which are arranged in tandem and which have a common piston rod 8 which passes through the partition wall 3 in a sliding and sealed manner (32). The pre-compressor part has a cylinder 10 which is open on the suction side. The pre-compression piston 11 has passage openings 17, which are closed by a valve plate 12 during the charging stroke or pre-compression, while they are open in the pressure stroke.

Die Trennwand 3 wird von Ansaugöffnungen 33 durchsetzt, die die Vorverdichterkammer 16 mit der Hochdruckkammer 26 verbinden. Im Druckhub werden die Ansaugöffnungen 33 durch eine im Hochdruckteil angeordnete Ventilplatte 34 verschlossen und im Ladehub geöffnet.The dividing wall 3 is penetrated by suction openings 33 which connect the pre-compression chamber 16 to the high-pressure chamber 26. In the pressure stroke, the suction openings 33 are closed by a valve plate 34 arranged in the high-pressure part and opened in the loading stroke.

Diese Pumpe weist jedoch den Nachteil auf, dass sie für Drücke über 400 bar nicht mehr geeignet ist. Die Dichtungen 32, die den Uebergang der Kolbenstange 8 vom Niederdruckbereich der Vorverdichterkammer in den Hochdruckbereich abdichten, sind bei höheren Drücken einem zu hohen Verschleiss ausgesetzt und führen so schnell zu Leckagen. Dadurch wird einerseits der Wirkungsgrad der Pumpe verringert. Andererseits müssen die Dichtungen öfters ausgewechselt werden, was zu kürzeren Betriebszeiten der Pumpe führt.However, this pump has the disadvantage that it is no longer suitable for pressures above 400 bar. The seals 32, which seal the transition of the piston rod 8 from the low-pressure area of the pre-compression chamber into the high-pressure area, are exposed to excessive wear at higher pressures and thus quickly lead to leakages. On the one hand, this reduces the efficiency of the pump. On the other hand, the seals have to be replaced frequently, which leads to shorter pump operating times.

Es ist deshalb Aufgabe der Erfindung, eine Pumpvorrichtung zu schaffen, die auch für höhere Drücke einsetzbar ist.It is therefore an object of the invention to provide a pump device which can also be used for higher pressures.

Diese Aufgabe löst eine Pumpvorrichtung mit den Merkmalen des Patentanspruches 1.This object is achieved by a pump device with the features of claim 1.

Die erfindungsgemässe Pumpvorrichtung weist im wesentlichen denselben Aufbau wie die aus CH-A-663'065 bekannte Pumpvorrichtung auf und arbeitet nach demselben Prinzip. In der erfindungsgemässen Pumpvorrichtung sind Hochdruck- und Niederdruckteil jedoch stärker voneinander getrennt und lediglich durch Ansaugöffnungen oder Ansaugkanäle miteinander verbunden. Durch die zwei getrennten Kolbenstangen entfällt die Dichtung im Uebergang vom Niederdruck- in den Hochdruckbereich, so dass beim Arbeiten mit höheren Drücken die Eigenschaften einer derartigen Dichtung nicht mehr berücksichtigt werden müssen. Da die Kolbenstangen synchron angetrieben werden, ist ein einwandfreies Funktionieren der Pumpvorrichtung trotzdem gewährleistet.The pump device according to the invention has essentially the same structure as the pump device known from CH-A-663'065 and works on the same principle. In the pump device according to the invention, however, the high-pressure and low-pressure parts are more separated from one another and are only connected to one another by suction openings or suction channels. The two separate piston rods eliminate the seal in the transition from the low-pressure to the high-pressure area, so that the properties of such a seal no longer have to be taken into account when working at higher pressures. Since the piston rods are driven synchronously, the pump device can still function properly.

In einer bevorzugten Ausführungsform sind die Bewegungen der Kolbenstangen mechanisch synchronisiert. Dabei ist in einer Variante die Kolbenstange des Vorverdichterteils vollständig innerhalb eines Fluidbehälters angeordnet, wobei sie mittels einer Verbindungsstange, die ebenfalls im Fluidbehälter verläuft, mit der Hochdruckkolbenstange verbunden ist. Die Verbindung befindet sich ebenfalls vollständig im Niederdruckbereich, so dass an die Dichtungen keine so hohen Anforderungen gestellt werden müssen.In a preferred embodiment, the movements of the piston rods are mechanically synchronized. In one variant, the piston rod of the precompressor part is arranged entirely within a fluid container, it being connected to the high-pressure piston rod by means of a connecting rod, which likewise runs in the fluid container. The connection is also completely in the low pressure range, so that the seals do not have to be so demanding.

In einer anderen Variante ragt die Niederdruckkolbenstange aus dem Fluidbehälter heraus und die mechanische Verbindung erfolgt ausserhalb des Fluidbehälters mittels parallel zu den Kolbenachsen versetzten Antriebsstangen. Die Niederdruckkolbenstange ist im Uebergang Fluidbehälter/Umgebung wiederum mit einer Niederdruckdichtung versehen. Dieser Aufbau weist spezielle Vorteile auf: Die Niederdruckdichtung ist leicht zugänglich.In another variant, the low-pressure piston rod protrudes from the fluid container and the mechanical connection takes place outside the fluid container by means of drive rods offset parallel to the piston axes. The low-pressure piston rod is in turn provided with a low-pressure seal in the fluid container / environment transition. This structure has special advantages: the low pressure seal is easily accessible.

Deshalb kann sie auf einfache Weise ausgewechselt werden. Zudem ist sie einstellbar, indem sie mittels mechanischer Kraftübertragung, beispielsweise durch eine verstellbare Manschette, unterschiedlich stark zusammengepresst wird.Therefore, it can be replaced easily. In addition, it can be adjusted by compressing it to different degrees by means of mechanical force transmission, for example by means of an adjustable sleeve.

In den beiliegenden Zeichnungen sind zwei Ausführungsbeispiele des Erfindungsgegenstandes dargestellt, die in der nachfolgenden Beschreibung erläutert sind. Es zeigen

Figur 1
eine Pumpvorrichtung gemäss dem Stand der Technik;
Figur 2
eine Ausführungsform einer erfindungsgemässen Pumpvorrichtung im Schnitt dargestellt und
Figur 3
eine weitere Ausführungsform der erfindungsgemässen Pumpvorrichtung im Schnitt dargestellt.
In the accompanying drawings, two exemplary embodiments of the subject matter of the invention are shown, which are explained in the following description. Show it
Figure 1
a pump device according to the prior art;
Figure 2
an embodiment of a pump device according to the invention shown in section and
Figure 3
a further embodiment of the pump device according to the invention shown in section.

In Figur 1 ist eine Pumpvorrichtung für cryogene Fluide gemäss dem Stand der Technik vereinfacht dargestellt, anhand der das Arbeitsprinzip der Pumpe ersichtlich ist, das auch in CH-A-663'065 ausführlich beschrieben ist.In FIG. 1, a pumping device for cryogenic fluids according to the prior art is shown in simplified form, by means of which the working principle of the pump can be seen, which is also described in detail in CH-A-663'065.

In Figur 2 ist ein bevorzugtes Ausführungsbeispiel der erfindungsgemäss verbesserten Pumpvorrichtung dargestellt. Die Pumpvorrichtung umfasst ebenfalls einen Vorverdichterteil und einen Hochdruckteil, wobei der Hochdruckteil eine Hochdruckkolbenpumpe 2 und der Vorverdichterteil eine Niederdruckkolbenpumpe 1, im folgenden auch Vorverdichterpumpe genannt, umfassen. Die Kolbenpumpen sind mindestens teilweise von einem Fluidbehälter 5 umgeben, der selber wiederum mittels eines Isolationsmantels 6 von der Umgebung wärmeisoliert ist. Als Isolationsmantel 6 dient in diesem Ausführungsbeispiel eine den Fluidbehälter 5 umgebende Doppelwandung, in der Vakuum herrscht.FIG. 2 shows a preferred embodiment of the pump device improved according to the invention. The pump device likewise comprises a pre-compressor part and a high-pressure part, the high-pressure part comprising a high-pressure piston pump 2 and the pre-compressor part a low-pressure piston pump 1, also referred to below as a pre-compressor pump. The piston pumps are at least partially surrounded by a fluid container 5, which itself is in turn by means of an insulation jacket 6 is thermally insulated from the environment. In this exemplary embodiment, a double wall surrounding the fluid container 5, in which vacuum prevails, serves as the insulation jacket 6.

Der Fluidbehälter 5 weist eine Zufuhröffnung 50 auf, durch die das Fluid in den Behälter gelangt. Zudem ist eine verschliessbare Entspannungsöffnung 51 vorhanden, die vom Behälter nach aussen führt und die zur allfälligen Ableitung von entstehendem Gasblasen dient.The fluid container 5 has a feed opening 50 through which the fluid enters the container. In addition, a closable expansion opening 51 is provided, which leads from the container to the outside and which is used to discharge any gas bubbles that may arise.

Die Niederdruckkolbenpumpe 1 weist einen festen Zylinder 10 auf, der sich vollständig innerhalb des Fluidbehälters 5 befindet. Der Zylinder 10 hat im wesentlichen die Form eines an der Saugseite offenen Rohres, das teilweise von einer Vorverdichter-Kolbenstange 13 durchsetzt ist und in dem ein mit der Vorverdichter-Kolbenstange 13 verbundener Vorverdichterkolben 11 verschiebbar gehalten ist.The low-pressure piston pump 1 has a fixed cylinder 10 which is located entirely within the fluid container 5. The cylinder 10 has essentially the shape of a tube open on the suction side, which is partially penetrated by a pre-compressor piston rod 13 and in which a pre-compressor piston 11 connected to the pre-compressor piston rod 13 is held displaceably.

Der Vorverdichterkolben 11 weist mindestens eine Durchlassöffnung 17 auf, die den Fluidbehälter 5 mit der Vorverdichterkammer 16 verbindet. Diese Oeffnung ist während des Vorverdichtens oder Ladehubes mittels einer Ventilplatte 12 geschlossen. Diese Ventilplatte 12 ist in diesem Beispiel im Innern der Vorverdichterkammer auf der der Durchlassöffnung abgewandten Seite des Kolbens angeordnet. In Figur 2 ist die Ventilplatte 12 in offener Lage dargestellt.The pre-compression piston 11 has at least one passage opening 17 which connects the fluid container 5 to the pre-compression chamber 16. This opening is closed by means of a valve plate 12 during the pre-compression or loading stroke. In this example, this valve plate 12 is arranged inside the precompression chamber on the side of the piston facing away from the passage opening. In Figure 2, the valve plate 12 is shown in the open position.

Die Vorverdichter-Kolbenstange 13 ragt mit ihrem kolbenfernen Ende aus dem Fluidbehälter 5 abgedichtet (14) heraus. Das kolbennahe Ende befindet sich innerhalb der Vorverdichterkammer 16. Die Dichtungen 14 befinden sich in einem länglichen Aufsatz 52 auf dem Fluidbehälter 5, so dass sie gut zugänglich sind. Der Aufsatz 52 umfasst eine verstellbare Manschette 52', mittels der die Dichtungen 14 eingestellt werden können, indem sie von der Manschette 52' unterschiedlich stark zusammengepresst werden.The end of the pre-compressor piston rod 13 extends out of the fluid container 5 in a sealed manner (FIG. 14). The end near the piston is located within the pre-compression chamber 16. The seals 14 are located in an elongated attachment 52 on the fluid container 5 so that they are easily accessible. The attachment 52 comprises an adjustable sleeve 52 ', by means of which the seals 14 can be adjusted by being pressed together to different degrees by the sleeve 52'.

Die Hochdruckkolbenpumpe 2 weist analog ebenfalls einen Zylinder 20 auf, der von einer Hochdruck-Kolbenstange 23 durchsetzt ist und in dem ein mit der Hochdruck-Kolbenstange 23 verbundener Hochdruckkolben 24 verschiebbar gehalten ist. Der Hochdruckkolben 21 ist mit Dichtungsringen 21' versehen. Diese Dichtungsringe dichten den Hochdruckbereich gegenüber dem restlichen Zylinder 20 ab. Im kolbenfernen Bereich ist im Zylinder 20 eine Rückstellfeder 25 und eine zusätzliche Niederdruckdichtung 24 angeordnet. In diesen Ausführungsbeispielen befindet sich der Hochdruckbereich der Hochdruckkolbenpumpe innerhalb des Fluidbehälters 5 und ist dadurch ebenfalls vom Isolationsmantel 6 umgeben. Am kolbenfernen Ende der Dichtungsringe 21' kann im Zylinder 20 mindestens eine Bohrung 28 vorhanden sein, die bei Leckagen das Fluid in den Fluidbehälter 5 zurückführt.The high-pressure piston pump 2 likewise has a cylinder 20, through which a high-pressure piston rod 23 passes and in which a high-pressure piston 24 connected to the high-pressure piston rod 23 is held displaceably. The high pressure piston 21 is provided with sealing rings 21 '. These sealing rings seal the high pressure area from the remaining cylinder 20. In the area remote from the piston, a return spring 25 and an additional low-pressure seal 24 are arranged in the cylinder 20. In these exemplary embodiments, the high-pressure area of the high-pressure piston pump is located within the fluid container 5 and is therefore also surrounded by the insulation jacket 6. At the end of the sealing rings 21 ′ remote from the piston, there can be at least one bore 28 in the cylinder 20, which leads the fluid back into the fluid container 5 in the event of leakages.

Von der Hochdruckkammer 26 führt eine Druckleitung 4 weg, wobei die Auslassöffnung der Hochdruckkammer mit einem Rückschlagventil 41 versehen ist.A pressure line 4 leads away from the high pressure chamber 26, the outlet opening of the high pressure chamber being provided with a check valve 41.

Der Zylinder 20 der Hockdruckpumpe 2 ist an seinem kolbenseitigen Ende bis auf mindestens eine Ansaugöffnung 27 geschlossen. Die Ansaugöffnung 27 ist im Druckhub durch einen Ventilkörper 22 verschlossen und im Ladehub offen. Der Ventilkörper 22 ist in diesem Beispiel ausserhalb des Zylinders angeordnet und weist mindestens einen Ansaugkanal 30 und einen Entspannungskanal 31 auf. Der mindestens eine Ansaugkanal 30 verbindet die Vorverdichterkammer 16 mit der Hochdruckkammer 26. Im Entspannungskanal 31 sammeln sich die aufsteigenden Gasblasen und werden in den Fluidbehälter geleitet, so dass fast ausschliesslich flüssiges Fluid gefördert werden kann.The cylinder 20 of the high pressure pump 2 is closed at its piston end except for at least one suction opening 27. The suction opening 27 is closed in the pressure stroke by a valve body 22 and open in the loading stroke. In this example, the valve body 22 is arranged outside the cylinder and has at least one intake duct 30 and one expansion duct 31. The at least one suction channel 30 connects the pre-compression chamber 16 to the high-pressure chamber 26. The rising gas bubbles collect in the expansion channel 31 and are directed into the fluid container, so that liquid fluid can be conveyed almost exclusively.

Die zwei Kolbenstangen 13,23 der Vorverdichterpumpe 1 und der Hochdruckpumpe 2 werden im Tandem synchron angetrieben. Die Synchronisation des Antriebes kann auf verschiedene Weise erfolgen, mechanisch oder elektronisch. In diesen Ausführungsbeispielen werden mechanische Synchronisationsmittel verwendet. Es ist mindestens eine Antriebsstange 70 vorhanden, in diesem Beispiel sind es zwei, die achsial versetzt und parallel zu den auf einer gemeinsamen Achse liegenden Vorverdichter- 13 und Hochdruckkolbenstange 23 liegen. Diese Antriebsstangen 70 sind mittels mindestens annähernd in einem rechten Winkel dazu angeordneten Querstangen 71 mit den kolbenfernen Enden sowohl der Vorverdichterkolbenstange 13 wie auch der Hochdruckkolbenstange 23 verbunden. Diese mechanischen Synchronisationsmittel sind auch bei bestehenden Pumpvorrichtungen montierbar und auf einfache Weise justierbar. Die Querstangen können auch einen anderen Winkel mit den Antriebsstangen bilden.The two piston rods 13, 23 of the pre-compressor pump 1 and the high pressure pump 2 are driven synchronously in tandem. The drive can be synchronized in various ways, mechanically or electronically. Mechanical synchronization means are used in these exemplary embodiments. There is at least one drive rod 70, in this example there are two which are axially offset and parallel to the pre-compressor 13 and high-pressure piston rod 23 lying on a common axis. These drive rods 70 are connected to the ends remote from the piston of both the pre-compression piston rod 13 and the high-pressure piston rod 23 by means of transverse rods 71 arranged at least approximately at right angles thereto. These mechanical synchronization means can also be mounted on existing pumping devices and are easily adjustable. The crossbars can also form a different angle with the drive rods.

In Figur 3 ist ein zweites bevorzugtes Ausführungsbeispiel der erfindungsgemässen Pumpvorrichtung dargestellt, aus im wesentlichen denselben Aufbau wie dasjenige in Figur 2 aufweist. Die Vorverdichterkolbenstange 13 ist hier achsial versetzt zur Hochdruckkolbenstange 23 angeordnet. Sie befindet sich vollständig innerhalb des Fluidbehälters 5 und ragt nicht aus diesem heraus. Die Vorverdichterkolbenstange 13 ist gegenüber dem Fluidbehälter wiederum abgedichtet (14'). Dabei durchsetzt die Kolbenstange 13 nun den Niederdruckzylinder 10 auf zwei Seiten. In diesem Beispiel befindet sich die Ventilplatte 12 auf der anderen Seite des Kolbens 11 als bei dem Beispiel in Figur 2 und ist fest mit der Kolbenstange verbunden, der Kolben 11 ist jedoch beweglich. Die in Figur 1 und 2 dargestellten Lösungen für die Vorverdichterpumpe sind miteinander austauschbar. Das kolbenferne Ende der Vorverdichterkolbenstange 13 ist wiederum mit der Hochdruckkolbenstange 23 mittels mechanischen Synchronisationsmitteln verbunden, die jedoch vollständig innerhalb des Fluidbehälters verlaufen. Diese Mittel umfassen hier eine Verbindungsstange 72, die mindestens annähernd in der senkrechten Ebene zu den Kolbenachsen verläuft, einerseits mit der Vorverdichterkolbenstange 13 verbunden ist und andererseits die Hochdruckkolbenstange 23 im Bereich hinter den Dichtungsringen 21', also im Niederdruckbereich, durchsetzt. Der Zylinder 20 der Hochdruckkolbenpumpe 2 weist in diesem Bereich entlang seiner Achse eine Ausnehmung 29 auf, die das Mitlaufen der Verbindungstange 72 mit den Kolbenstangen 13,23 ermöglicht. Es ist möglich, mehrere Vorverdichterpumpen mit derselben Hochdruckpumpe zu verbinden.FIG. 3 shows a second preferred exemplary embodiment of the pump device according to the invention, of essentially the same structure as that in FIG. 2. The pre-compression piston rod 13 is here axially offset from the high-pressure piston rod 23. It is located completely within the fluid container 5 and does not protrude this out. The pre-compression piston rod 13 is in turn sealed against the fluid container (14 '). The piston rod 13 now passes through the low pressure cylinder 10 on two sides. In this example, the valve plate 12 is on the other side of the piston 11 than in the example in FIG. 2 and is fixedly connected to the piston rod, but the piston 11 is movable. The solutions for the pre-compressor pump shown in FIGS. 1 and 2 are interchangeable. The end of the pre-compression piston rod 13 remote from the piston is in turn connected to the high-pressure piston rod 23 by means of mechanical synchronization means, which, however, run entirely within the fluid container. These means here comprise a connecting rod 72 which runs at least approximately in the vertical plane to the piston axes, is connected on the one hand to the pre-compression piston rod 13 and on the other hand penetrates the high-pressure piston rod 23 in the area behind the sealing rings 21 ', that is to say in the low-pressure area. In this area, the cylinder 20 of the high-pressure piston pump 2 has a recess 29 along its axis, which enables the connecting rod 72 to run with the piston rods 13, 23. It is possible to connect several pre-compressor pumps to the same high pressure pump.

Weitere mechanische Mittel zur Synchronisation der Kolbenstangen sind möglich, die vollständig innerhalb oder auch teilweise oder ganz ausserhalb des Fluidbehälters verlaufen können.Further mechanical means for synchronizing the piston rods are possible, which can run completely inside or also partially or completely outside the fluid container.

Claims (10)

Pumpvorrichtung für cryogene Fluide mit einem Hochdruckteil und einem Vorverdichterteil, zwischen denen eine Trennwand (3) angeordnet ist, wobei der Hochdruckteil eine Hochdruckkolbenpumpe (2) und der Vorverdichterteil mindestens eine Vorverdichterkolbenpumpe (1) umfassen, die durch die Trennwand (3) voneinander getrennt, im Tandem angeordnet und synchron betrieben sind, dadurch gekennzeichnet, dass jede Kolbenpumpe (1,2) eine Kolbenstange (13,23) aufweist, die mindestens im Bereich der Trennwand (3) vollständig von der anderen Kolbenstange (13,23) getrennt ist.Pumping device for cryogenic fluids with a high-pressure part and a pre-compressor part, between which a partition (3) is arranged, the high-pressure part comprising a high-pressure piston pump (2) and the pre-compressor part comprising at least one pre-compressor piston pump (1), which are separated from one another by the partition (3), Arranged in tandem and operated synchronously, characterized in that each piston pump (1, 2) has a piston rod (13, 23) which is completely separated from the other piston rod (13, 23) at least in the region of the partition (3). Pumpvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Antrieb der Kolbenstangen (13,23) elektronisch synchronisiert ist.Pump device according to claim 1, characterized in that the drive of the piston rods (13, 23) is electronically synchronized. Pumpvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Antrieb der Kolbenstangen (13,23) mit mechanischen Mitteln (70,71,72) synchronisiert ist.Pump device according to claim 1, characterized in that the drive of the piston rods (13, 23) is synchronized with mechanical means (70, 71, 72). Pumpvorrichtung nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass die Kolbenstangen (13,23) auf einer gemeinsamen Achse liegen.Pump device according to one of claims 2 or 3, characterized in that the piston rods (13, 23) lie on a common axis. Pumpvorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die mechanischen Mittel mindestens eine Antriebsstange (70) umfassen, die achsial zur Hochdruckkolbenstange (23) versetzt angeordnet ist und mit der Hochdruck- und der Vorverdichterkolbenstange (13,23) verbunden ist.Pump device according to claim 3, characterized in that the mechanical means comprise at least one drive rod (70) which is offset axially to the high-pressure piston rod (23) and is connected to the high-pressure and the pre-compressor piston rod (13, 23). Pumpvorrichtung nach Anspruch 3, dadurch gekennzeichnet, die mindestens eine Vorverdichterkolbenstange (13) achsial zur Hochdruckkolbenstange (13) versetzt angeordnet ist und dass die mechanischen Mittel mindestens eine annähernd senkrecht zu den Kolbenachsen (13,23) verlaufende Verbindungstange (72) umfassen, die die Hochdruck- mit mindestens einer Vorverdichterkolbenstange (13,23) verbindet.Pump device according to Claim 3, characterized in that the at least one pre-compression piston rod (13) is arranged offset axially to the high-pressure piston rod (13) and that the mechanical means comprise at least one connecting rod (72) which runs approximately perpendicular to the piston axes (13, 23) and which High pressure connects with at least one pre-compressor piston rod (13, 23). Pumpvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Pumpvorrichtung einen Fluidbehälter (5) umfasst, der durch den Vorverdichterkolben (11) der mindestens einen Vorverdichterkolbenpumpe (1) von der mindestens einen Vorverdichterkammer (16) getrennt ist, wobei der Vorverdichterkolben (11) mindestens eine Durchlassöffnung (17) aufweist, die durch eine Ventilplatte (12) verschliessbar ist.Pump device according to claim 1, characterized in that the pump device comprises a fluid container (5) which is separated from the at least one pre-compressor chamber (16) by the pre-compressor piston (11) of the at least one pre-compressor piston pump (1), the pre-compressor piston (11) at least has a passage opening (17) which can be closed by a valve plate (12). Pumpvorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die mindestens eine Vorverdichterkolbenstange (13) mit ihrem kolbenfernen Ende aus dem Fluidbehälter (5) abgedichtet herausragt.Pump device according to claim 7, characterized in that the at least one pre-compression piston rod (13) projects with its end remote from the piston in a sealed manner from the fluid container (5). Pumpvorrichtung nach Anspruch 5 und 8, dadurch gekennzeichnet, dass die mindestens eine Antriebsstange (70) ausserhalb des Fluidbehälters (5) verläuft und mittels Querstangen (71) mit der Vorverdichter- und Hochdruckkolbenstange (13,23) verbunden ist.Pump device according to Claims 5 and 8, characterized in that the at least one drive rod (70) extends outside the fluid container (5) and is connected to the pre-compressor and high-pressure piston rod (13, 23) by means of cross rods (71). Pumpvorrichtung nach Anspruch 6 und 7, dadurch gekennzeichnet, dass die Vorverdichterkammer (16) und die Hochdruckkammer (26) vollständig innerhalb des Fluidbehälters (5) angeordnet sind, wobei die Verbindungsstange (72) im Niederdruckteil der Hochdruckpumpe (2) mit der Hochdruck-kolbenstange (23) verbunden ist.Pump device according to claim 6 and 7, characterized in that the pre-compression chamber (16) and the high pressure chamber (26) completely within the fluid container (5) are arranged, the connecting rod (72) in the low-pressure part of the high-pressure pump (2) being connected to the high-pressure piston rod (23).
EP19960810311 1995-05-26 1996-05-15 Pump device for cryogenic fluids Expired - Lifetime EP0744546B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH156495 1995-05-26
CH1564/95 1995-05-26

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EP0744546B1 EP0744546B1 (en) 1998-12-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007958A1 (en) * 2002-07-12 2004-01-22 Cryomec Ag High pressure pump for cryogenic liquid media
EP2461033A1 (en) * 2010-12-01 2012-06-06 Linde Aktiengesellschaft Multi-stage piston compressor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742150C (en) * 1941-12-04 1943-11-23 Draegerwerk Heinr U Bernh Drae Compressor or transfer pump for oxygen
US2630757A (en) * 1948-03-26 1953-03-10 Independent Engineering Compan Combined type series pump for flashable liquids
EP0087131A1 (en) * 1982-02-22 1983-08-31 Air Products And Chemicals, Inc. High pressure helium pump for liquid or supercritical gas
CH663065A5 (en) * 1984-07-20 1987-11-13 Cryomec Ag PUMPING DEVICE FOR CRYOGENEIC FLUIDS.
DE4142053C1 (en) * 1991-12-19 1993-06-17 Linde Ag, 6200 Wiesbaden, De

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742150C (en) * 1941-12-04 1943-11-23 Draegerwerk Heinr U Bernh Drae Compressor or transfer pump for oxygen
US2630757A (en) * 1948-03-26 1953-03-10 Independent Engineering Compan Combined type series pump for flashable liquids
EP0087131A1 (en) * 1982-02-22 1983-08-31 Air Products And Chemicals, Inc. High pressure helium pump for liquid or supercritical gas
CH663065A5 (en) * 1984-07-20 1987-11-13 Cryomec Ag PUMPING DEVICE FOR CRYOGENEIC FLUIDS.
DE4142053C1 (en) * 1991-12-19 1993-06-17 Linde Ag, 6200 Wiesbaden, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007958A1 (en) * 2002-07-12 2004-01-22 Cryomec Ag High pressure pump for cryogenic liquid media
EP2461033A1 (en) * 2010-12-01 2012-06-06 Linde Aktiengesellschaft Multi-stage piston compressor

Also Published As

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EP0744546B1 (en) 1998-12-23
DE59601034D1 (en) 1999-02-04

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