EP0174269B1 - Pump for cryogenic fluids - Google Patents

Pump for cryogenic fluids Download PDF

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Publication number
EP0174269B1
EP0174269B1 EP85810315A EP85810315A EP0174269B1 EP 0174269 B1 EP0174269 B1 EP 0174269B1 EP 85810315 A EP85810315 A EP 85810315A EP 85810315 A EP85810315 A EP 85810315A EP 0174269 B1 EP0174269 B1 EP 0174269B1
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EP
European Patent Office
Prior art keywords
supercharger
pump
pump according
high pressure
piston
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
EP85810315A
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German (de)
French (fr)
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EP0174269A3 (en
EP0174269A2 (en
Inventor
Jean Tornare
Klaus Bofinger
Claudio Tschopp
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Fives Cryomec AG
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Cryomec AG
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Publication date
Application filed by Cryomec AG filed Critical Cryomec AG
Priority to AT85810315T priority Critical patent/ATE49629T1/en
Publication of EP0174269A2 publication Critical patent/EP0174269A2/en
Publication of EP0174269A3 publication Critical patent/EP0174269A3/en
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Publication of EP0174269B1 publication Critical patent/EP0174269B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • 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
    • 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
    • F04B3/00—Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/036—Very high pressure, i.e. above 80 bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/901—Cryogenic pumps

Definitions

  • cryogenic fluids presents particular difficulties since the fluid changes from the liquid to the gaseous state of aggregation both when the pressure drops and when the temperature rises.
  • the pump is under atmospheric pressure and has adjusted to the conditions of the vapor pressure curve. During operation, the conditions must be brought above those of the vapor pressure curve of the cryogenic fluid to be pumped. This is in view of the fact that the pressure decreases during the intake stroke, which also gives rise to gas formation.
  • a pump with a stepped piston, hollow piston rod and valves in the piston has become known from CH-PS-615 982.
  • the excess volume conveyed by the pre-compressor piston is returned to the storage tank by means of a complex valve system.
  • Such a pump is complex and expensive to manufacture.
  • the invention has for its object to provide a pump according to the preamble of claim 1, which works on this principle but is easier to build and cheaper to manufacture and causes less gas formation in the pre-compression.
  • the invention solves this problem with a cryogenic pump which has the specific features of claim 1.
  • FIG. 1 an embodiment of the subject of the invention is shown. It shows a cryogenic pump in a simplified representation, the drive mechanism in the view and the pump part is shown in section.
  • the pump comprises a high pressure part and a pre-compressor part, which are arranged in tandem.
  • the main components of the pump are: a crankcase 1, an intermediate piece 2 with ribs, the high-pressure pump cylinder 3 with piston 4, a pre-compression cylinder 5 with piston 6.
  • the pre-compression cylinder with its piston are located in a double-walled intermediate container 7.
  • the two pistons 4 and 6 are mounted on a common piston rod 8 which passes through the bottom 31 of the high pressure cylinder. It is sealed by means of a seal 32.
  • the floor thus serves as a partition between the two parts.
  • Intake openings 33 penetrate the bottom of the high-pressure cylinder. During the pressure stroke, an annular plate valve 34 closes these openings.
  • the outlet opening of the high-pressure cylinder is provided with a spring-loaded ball valve 35.
  • the high-pressure piston 4 is provided with sealing rings 36.
  • the precompression cylinder 5 has the shape of a tube which is open on the suction side and has a bore 51 at its highest point.
  • the pre-compression piston 6 has several through bores 61 which are closed by an annular plate valve 62 during the pre-compression or loading stroke. A stop for the plate valve 62 is attached to the piston rod 8.
  • the double-walled intermediate container 7 designed as a Dewar vessel is connected to the cylinder 5 by means of a flange 71.
  • a fluid supply line 72 leads through a bore 73 in the flange of the fluid into the container 7.
  • a closable bore 74 which is indicated by a dash-dotted line and which is used for briefly releasing the gas.
  • the drawing shows the pump in a position inclined at 45 ° to the vertical, which corresponds to a working position, because then the bore 51 in the pre-compressor cylinder is at the highest point.
  • the pump can also be operated in a horizontal position instead of in an inclined position. This is of particular importance because then the inevitable, but as small as possible, from the. Fluid-forming gases rise and can collect here.
  • the pre-compression piston 6 can therefore almost exclusively convey liquid fluid into the high-pressure piston.
  • the displacement volume of the pre-compressor part is larger than that of the high-pressure pump, so that liquid fluid also escapes here.
  • the pre-compression piston 6 does not have any sealing rings against the cylinder 5, but rather has a slight play against the inner wall of the cylinder, so that the excess of fluid conveyed can escape here as well and thus does not cause unnecessarily high internal friction. that would lead to gas formation.
  • the pump is shown during a suction stroke in which the piston rod with the pistons 4 and 6 moves obliquely upwards.
  • the valve plate 62 therefore closes off the bores in the piston 6, while the valve plate 34 clears the bores 33.
  • the intermediate container 7 is filled to the level N with liquid fluid, above this level the fluid is in the gaseous state, as indicated in the drawing by small gas bubbles.
  • the pre-compressor piston therefore fills the high-pressure cylinder almost exclusively with liquid fluid. Due to the increased pressure, the gaseous part returns to the liquid phase.
  • the suction stroke has ended, the movement reverses and the high-pressure piston presses liquid fluid into the high-pressure line tung 37.
  • the closable bore 74 is used to discharge the gas, especially when starting, when the various pump parts have not yet cooled to near the low temperature of the fluid and a lot of gas is formed.
  • the high pressure cylinder would only compress gas and would not deliver liquid fluid.
  • the pump is used, for example, to pump liquid nitrogen, it has a temperature of up to -196 ° C. and is under an overpressure of approx. 2 bar.
  • the liquid nitrogen comes from a large storage tank, passes through line 72 to the pump and is brought to an overpressure of approx. 200 bar in the liquid state, passed through an evaporator and filled into pressure-resistant bottles in gaseous state at ambient temperature. The nitrogen in these bottles is under 200 bar pressure.
  • the bottles filled in this way are transported to the end user.

Abstract

The cryogenic pump operates in two stages, utilizing a supercharging part and a high pressure part. These two parts are comprised of a high pressure piston pump (3, 4, 34, 35) and a supercharger (5, 6, 61, 62) disposed in a tandem relationship and sharing a common piston rod (8). The supercharger is enclosed in a heat insulated intermediate container (7) and delivers the liquid cryogenic fluid to the high pressure cylinder. The pump operates to convey a liquid cryogenic fluid such as liquid nitrogen, for example, at a high pressure through evaporating means into pressure resistant commercial steel cylinders where the gaseous nitrogen is kept at a pressure of 200 bar and ambient temperature.

Description

Das Pumpen cryogener Fluiden bietet besondere Schwierigkeiten da das Fluid sowohl beim Absinken des Drucks als beim Anstieg der Temperatur vom flüssigen- in den gasförmigen Aggregatszustand übergeht. Die Pumpe befindet sich unter atmosphärischem Druck und hat sich auf die Bedingungen der Dampfdruckkurve eingestellt. Während des Betriebes müssen die Bedingungen über jene der Dampfdruckkurve des zu pumpenden cryogenen Fluids gebracht werden. Dies in Betracht dessen, dass beim Ansaugtakt der Druck abnimmt was ebenfalls zu Gasbildung Anlass gibt.Pumping cryogenic fluids presents particular difficulties since the fluid changes from the liquid to the gaseous state of aggregation both when the pressure drops and when the temperature rises. The pump is under atmospheric pressure and has adjusted to the conditions of the vapor pressure curve. During operation, the conditions must be brought above those of the vapor pressure curve of the cryogenic fluid to be pumped. This is in view of the fact that the pressure decreases during the intake stroke, which also gives rise to gas formation.

Bekannte Massnahmen zur Begegnung dieser Schwierigkeiten sind daher:

  • 1. das Fluid aus dem grossen Vorratstank in dem Dampfdruckbedingungen herrschen in einen möglichst gut wärmeisolierten geschlossenen Zwischenbehälter zu leiten und die Temperatur unter jener des Dampfdruckes zu senken.
  • 2. den Druck im Zwischenbehälter über jenen des Dampfdruckes zu erhöhen.
Known measures to counter these difficulties are therefore:
  • 1. to direct the fluid from the large storage tank in the vapor pressure conditions into a closed intermediate container which is as well thermally insulated as possible and to lower the temperature below that of the vapor pressure.
  • 2. increase the pressure in the intermediate container above that of the vapor pressure.

Für die letztgenannte Lösung ist aus der CH-PS-615 982 eine Pumpe mit Stufenkolben, hohler Kolbenstange und Ventilen im Kolben bekannt geworden. Das vom Vorverdichterkolben geförderte Volumenübermass wird dabei mittels eines aufwendigen Ventilsystems in den Vorratstank zurückgeleitet. Eine solche Pumpe ist aber aufwendig und teuer in der Herstellung.For the latter solution, a pump with a stepped piston, hollow piston rod and valves in the piston has become known from CH-PS-615 982. The excess volume conveyed by the pre-compressor piston is returned to the storage tank by means of a complex valve system. Such a pump is complex and expensive to manufacture.

Die Erfindung stellt sich zur Aufgabe eine Pumpe gemäss Oberbegriff des Patentanspruches 1 zu schaffen, die nach diesem Prinzip arbeitet aber einfacher auf gebaut und billiger hergestellt werden kann und weniger Gasbildung in der Vorverdichtung bewirkt.The invention has for its object to provide a pump according to the preamble of claim 1, which works on this principle but is easier to build and cheaper to manufacture and causes less gas formation in the pre-compression.

Die Erfindung löst diese Aufgabe mit einer cryogenen Pumpe die die spezifischen Merkmale des Anspruches 1 aufweist.The invention solves this problem with a cryogenic pump which has the specific features of claim 1.

In der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes dargestellt. Sie zeigt eine cryogene Pumpe in vereinfachter Darstellung, deren Antriebsmechanismus in Ansicht und deren Pumpenteil im Schnitt dargestellt ist. Die Pumpe umfasst einen Hochdruckteil und einen Vorverdichterteil, die in Tandem angeordnet sind.In the drawing, an embodiment of the subject of the invention is shown. It shows a cryogenic pump in a simplified representation, the drive mechanism in the view and the pump part is shown in section. The pump comprises a high pressure part and a pre-compressor part, which are arranged in tandem.

Die Hauptbestandteile der Pumpe sind: ein Kurbelgehäuse 1, ein mit Rippen versehenes Zwischenstück 2, den Hochdruck-Pumpzylinder 3 mit Kolben 4, einen Vorverdichterzylinder 5 mit Kolben 6. Der Vorverdichterzylinder mit seinem Kolben befinden sich in einem doppelwandigen Zwischenbehälter 7. Die beiden Kolben 4 und 6 sind auf einer gemeinsamen Kolbenstange 8 befestigt, die den Boden 31 des Hochdruckzylinders durchsetzt. Sie ist mittels Dichtung 32 abgedichtet. Der Boden dient somit als Trennwand zwischen den beiden Teilen.The main components of the pump are: a crankcase 1, an intermediate piece 2 with ribs, the high-pressure pump cylinder 3 with piston 4, a pre-compression cylinder 5 with piston 6. The pre-compression cylinder with its piston are located in a double-walled intermediate container 7. The two pistons 4 and 6 are mounted on a common piston rod 8 which passes through the bottom 31 of the high pressure cylinder. It is sealed by means of a seal 32. The floor thus serves as a partition between the two parts.

Ansaugöffnungen 33 durchsetzen den Boden des Hochdruckzylinders. Während des Druckhubes schliesst ein ringförmiges Plattenventil 34 diese Öffnungen. Die Auslassöffnung des Hochdruckzylinders ist mit einem federbelasteten Kugelventil 35 versehen. Der Hochdruckkolben 4 ist mit Dichtungsringen 36 versehen.Intake openings 33 penetrate the bottom of the high-pressure cylinder. During the pressure stroke, an annular plate valve 34 closes these openings. The outlet opening of the high-pressure cylinder is provided with a spring-loaded ball valve 35. The high-pressure piston 4 is provided with sealing rings 36.

Der Vorverdichtungszylinder 5 hat die Form eines an der Saugseite offenen Rohres das an seiner höchsten Stelle eine Bohrung 51 aufweist. Der Vorverdichterkolben 6 hat einige Durchgangsbohrungen 61, die während des vorverdichtens oder Ladehubes durch ein ringförmiges Plattenventil 62 geschlossen werden. Auf der Kolbenstange 8 ist ein Anschlag für das Plattenventil 62 angebracht.The precompression cylinder 5 has the shape of a tube which is open on the suction side and has a bore 51 at its highest point. The pre-compression piston 6 has several through bores 61 which are closed by an annular plate valve 62 during the pre-compression or loading stroke. A stop for the plate valve 62 is attached to the piston rod 8.

Der doppelwandige, wie ein Dewar-Gefäss ausgebildete Zwischenbehälter 7 ist mittels eines Flansches 71 mit dem Zylinder 5 verbunden. Eine Fluid-Zufuhrleitung 72 leitet durch eine Bohrung 73 im Flansch des Fluid in den Behälter 7. Im Flansch 71 ist noch eine verschliessbare Bohrung 74 angebracht, die durch eine strichpunktierte Linie angedeutet ist und die dem kurz zeitigen Ablassen des Gases dient.The double-walled intermediate container 7 designed as a Dewar vessel is connected to the cylinder 5 by means of a flange 71. A fluid supply line 72 leads through a bore 73 in the flange of the fluid into the container 7. In the flange 71 there is also a closable bore 74, which is indicated by a dash-dotted line and which is used for briefly releasing the gas.

Die Zeichnung zeigt die Pumpe in einer um 45° gegen die Vertikale geneigten Lage, die einer Arbeitslage entspricht, weil sich dann die Bohrung 51 in, Vorverdichterzylinder an der höchsten Stelle befindet. Statt in schräger Lage kann die Pumpe auch in horizontaler Lage betrieben werden. Dies ist von besonderer Wichtigkeit, weil sich dann die unvermeidlichen, aber möglichst geringen aus den. Fluid bildenden Gase aufsteigen und hier sammeln können. Der Vorverdichterkolben 6 kann demzufolge fast ausschliesslich flüssiges Fluid in den Hochdruckkolben fördern.The drawing shows the pump in a position inclined at 45 ° to the vertical, which corresponds to a working position, because then the bore 51 in the pre-compressor cylinder is at the highest point. The pump can also be operated in a horizontal position instead of in an inclined position. This is of particular importance because then the inevitable, but as small as possible, from the. Fluid-forming gases rise and can collect here. The pre-compression piston 6 can therefore almost exclusively convey liquid fluid into the high-pressure piston.

Dazu kommt noch, dass das Verdrängungsvolumen des Vorverdichterteiles grösser ist als dasjenige der Hochdruckpumpe, so dass auch flüssiges Fluid hier austritt. Wie aus der vorgehenden Beschreibung hervorgeht, besitzt der Vorverdichterkolben 6 keine Dichtungsringe gegen den Zylinder 5, sondern hat ein geringes Spiel gegen die Innenwand des Zylinders, so dass das Übermass an gefördertem Fluid auch hier entweichen kann und damit keine unnötige hohe innere Reibung verursacht wird, die zu Gasbildung führen würde.In addition, the displacement volume of the pre-compressor part is larger than that of the high-pressure pump, so that liquid fluid also escapes here. As can be seen from the above description, the pre-compression piston 6 does not have any sealing rings against the cylinder 5, but rather has a slight play against the inner wall of the cylinder, so that the excess of fluid conveyed can escape here as well and thus does not cause unnecessarily high internal friction. that would lead to gas formation.

In der Zeichnung ist die Pumpe während eines Saughubes dargestellt bei dem sich die Kolbenstange mit den Kolben 4 und 6 schräg nach oben bewegt. Daher schliesst die Ventilplatte 62 die Bohrungen im Kolben 6 ab während die Ventilplatte 34 die Bohrungen 33 freigibt. Der Zwischenbehälter 7 ist bis zum Niveau N mit flüssigem Fluid gefüllt, über diesem Niveau befindet sich das Fluid in gasförmigen Zustand wie dies in der Zeichnung durch kleine Gasblasen angedeutet ist. Wie ersichtlich füllt daher der Vorverdichterkolben den Hochdruckzylinder fast ausschliesslich mit flüssigem Fluid. Durch den erhöhten Druck geht der gasförmige Teil wieder in die flüssige Phase über. Ist der Saughub beendet kehrt die Bewegung um und drückt der Hochdruckkolben flüssiges Fluid in die Hochdruckleitung 37.In the drawing, the pump is shown during a suction stroke in which the piston rod with the pistons 4 and 6 moves obliquely upwards. The valve plate 62 therefore closes off the bores in the piston 6, while the valve plate 34 clears the bores 33. The intermediate container 7 is filled to the level N with liquid fluid, above this level the fluid is in the gaseous state, as indicated in the drawing by small gas bubbles. As can be seen, the pre-compressor piston therefore fills the high-pressure cylinder almost exclusively with liquid fluid. Due to the increased pressure, the gaseous part returns to the liquid phase. When the suction stroke has ended, the movement reverses and the high-pressure piston presses liquid fluid into the high-pressure line tung 37.

Die verschliessbare Bohrung 74 dient dem Ablassen des Gases, insbesondere beim Anlassen wenn die verschiedenen Pumpenteile sich noch nicht bis nahe der Tieftemperatur des Fluids abgekühlt haben und sich viel Gas bildet. Der Hochdruckzylinder würde nur Gas komprimieren und kein flüssiges Fluid fördern.The closable bore 74 is used to discharge the gas, especially when starting, when the various pump parts have not yet cooled to near the low temperature of the fluid and a lot of gas is formed. The high pressure cylinder would only compress gas and would not deliver liquid fluid.

Wird die Pumpe beispielsweise zum Pumpen von flüssigem Stickstoff verwendet, hat dieser eine Temperatur von bis -196°C und befindet sich unter einem Überdruck von ca. 2 Bar. Der flüssige Stickstoff kommt aus einem grossen Vorratstank, gelangt durch die Leitung 72 zur Pumpe und wird von dieser in flüssigem Zustand auf einen Überdruck von ca. 200 Bar gebracht, durch einen Verdampfer geleitet und in gasförmigen Zustand bei Umgebungstemperatur in druckfeste Flaschen abgefüllt. In diesen Flaschen befindet sich der Stickstoff unter 200 Bar -druck. Die so gefüllten Flaschen werden zum Endverbraucher transportiert.If the pump is used, for example, to pump liquid nitrogen, it has a temperature of up to -196 ° C. and is under an overpressure of approx. 2 bar. The liquid nitrogen comes from a large storage tank, passes through line 72 to the pump and is brought to an overpressure of approx. 200 bar in the liquid state, passed through an evaporator and filled into pressure-resistant bottles in gaseous state at ambient temperature. The nitrogen in these bottles is under 200 bar pressure. The bottles filled in this way are transported to the end user.

Claims (8)

1. Pump for cryogenic fluids, with a high pressure part and a supercharger part, characterized in that between said parts is arranged a partition (31), the supercharger part being housed in a thermally insulated intermediate container (7) sealingly connected to the partition, that the high pressure and supercharger parts have two tandem-arranged piston pumps (3, 4; 5, 6) separated by the partition (31) with a common piston rod (8) passing in sliding and sealing manner through said partition and that the supercharger has an intake-side, open cylinder (5).
2. Pump according to claim 1, characterized in that the supercharger piston (6) is provided with intake ports (61), which are covered by an annular disk valve (62).
3. Pump according to claim 1, characterized in that in the operating position, the longitudinal axis of piston rod (8) is inclined by at least approximately 45° to the vertical.
4. Pump according to claim 1, characterized in that in the operating position the longitudinal axis of piston rod (8) is horizontal.
5. Pump according to claim 1, characterized in that at its highest point in the operating position the intermediate container (7) is provided with a closable gas blow-off opening (74).
6. Pump according to claim 1, characterized in that the drive mechanism (1) is connected by a casing part provided with cooling ribs to the high pressure part (3, 4) of the pump.
7. Pump according to claim 1, characterized in that at its highest point in the operating position the supercharger cylinder (5) is provided with at least one discharge port (51) issuing into the intermediate container (7) for the fluid part which has passed into the gaseous state in operation.
8. Pump according to claim 1, characterized in that a clearance is provided between the supercharger cylinder (5) and the supercharger piston (6), which allows a volume balance between the compression volume and the pump volume.
EP85810315A 1984-07-20 1985-07-08 Pump for cryogenic fluids Expired - Lifetime EP0174269B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810315T ATE49629T1 (en) 1984-07-20 1985-07-08 PUMP FOR CRYOGENE FLUIDS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3535/84 1984-07-20
CH3535/84A CH663065A5 (en) 1984-07-20 1984-07-20 PUMPING DEVICE FOR CRYOGENEIC FLUIDS.

Publications (3)

Publication Number Publication Date
EP0174269A2 EP0174269A2 (en) 1986-03-12
EP0174269A3 EP0174269A3 (en) 1987-03-25
EP0174269B1 true EP0174269B1 (en) 1990-01-17

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ID=4258084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810315A Expired - Lifetime EP0174269B1 (en) 1984-07-20 1985-07-08 Pump for cryogenic fluids

Country Status (6)

Country Link
US (1) US4639197A (en)
EP (1) EP0174269B1 (en)
AT (1) ATE49629T1 (en)
CA (1) CA1250219A (en)
CH (1) CH663065A5 (en)
DE (1) DE3575454D1 (en)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3621727A1 (en) * 1986-06-28 1988-01-14 Deutsche Forsch Luft Raumfahrt PISTON PUMP FOR CRYOGENIC LIQUIDS
DE3710363C1 (en) * 1987-03-28 1988-12-01 Deutsche Forsch Luft Raumfahrt Method and device for conveying a liquid
CH672354A5 (en) * 1987-05-19 1989-11-15 Cryopump Ag
US4850807A (en) * 1987-06-16 1989-07-25 Frantz Medical Development Ltd. Disposable cassette for fluid delivery pump systems
US5237309A (en) * 1987-07-20 1993-08-17 Frantz Medical Development, Ltd. Pump cassette and method of pumping
DK162854C (en) * 1989-08-04 1992-05-04 Cosan Crisplant As Piston pump or compressor for handling both gas and wet gas, as well as vacuum cleaners for LPG gas cylinders with such a pump
US5511955A (en) * 1995-02-07 1996-04-30 Cryogenic Group, Inc. Cryogenic pump
US5575626A (en) * 1995-05-12 1996-11-19 Cryogenic Group, Inc. Cryogenic pump
EP0744546B1 (en) * 1995-05-26 1998-12-23 Cryomec AG Pump device for cryogenic fluids
US5996472A (en) * 1996-10-07 1999-12-07 Chemical Seal And Packing, Inc. Cryogenic reciprocating pump
US5810570A (en) * 1997-01-06 1998-09-22 Chemical Seal & Packing, Inc. Super-low net positive suction head cryogenic reciprocating pump
DE19915847A1 (en) * 1999-04-08 2000-10-12 Linde Tech Gase Gmbh Pump system for pumping cryogenic liquids
US6267527B1 (en) 2000-01-28 2001-07-31 Michael Miller Dowel and method of using same
US6530761B1 (en) * 2001-04-04 2003-03-11 Air Products And Chemicals, Inc. Double-acting, two-stage pump
US6871681B2 (en) * 2002-11-22 2005-03-29 Miller Dowel Company Dowel connection system and method
DE10302690A1 (en) * 2003-01-24 2004-08-12 Gottlieb Weinmann - Geräte für Medizin und Arbeitsschutz - GmbH + Co. Gas compression device has valve block arranged between two compression phases which are coupled such that longitudinal axes of flasks in compression phases run on common straight line
US7223080B2 (en) * 2004-01-22 2007-05-29 Duron Paul P Double-acting, high pressure cryogenic pump
US20060054064A1 (en) * 2004-09-13 2006-03-16 Miller Michael R Wooden dowel in pallet assembly
US7856933B2 (en) 2004-09-13 2010-12-28 Miller Dowel Company Wooden dowel in pallet assembly
WO2010091085A2 (en) * 2009-02-03 2010-08-12 Miller Dowel Company Beveled block pallet
US8915719B2 (en) * 2011-11-11 2014-12-23 Air Products And Chemicals, Inc. Cryogenic reciprocating pump intermediate distance piece
US10041484B2 (en) * 2015-01-30 2018-08-07 Caterpillar Inc. Pump having inlet reservoir with vapor-layer standpipe
US9828987B2 (en) * 2015-01-30 2017-11-28 Caterpillar Inc. System and method for priming a pump
US9915251B2 (en) * 2015-03-26 2018-03-13 Caterpillar Inc. Fuel system having serially arranged in-tank pumps
ES2796383T3 (en) * 2016-08-29 2020-11-26 Acd Llc High pressure fuel gas pump
USD812228S1 (en) 2017-03-21 2018-03-06 Miller Dowel Company Crown dowel
US10005586B1 (en) 2017-04-05 2018-06-26 Miller Dowel Company Dowel and pallet using dowel
US10774820B2 (en) * 2017-11-13 2020-09-15 Caterpillar Inc. Cryogenic pump
US10935064B2 (en) 2019-04-19 2021-03-02 Miller Dowel Company Dowel with directional expanding portion and wall system including directional dowel
WO2020223128A1 (en) 2019-05-01 2020-11-05 Miller Dowel Company Transport apparatus for assembly component and method of using transport apparatus
WO2020263758A1 (en) 2019-06-24 2020-12-30 Miller Dowel Company Guidance apparatus for assembly of construction panels
EP4097363A4 (en) 2020-01-27 2023-06-21 Miller Dowel Company Construction using bundled tube and threaded stepped dowels
FR3107572B1 (en) * 2020-02-21 2022-02-25 Air Liquide Compression apparatus and filling station comprising such apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US464223A (en) * 1891-12-01 Ernest c

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US236992A (en) * 1881-01-25 gushier
US792790A (en) * 1904-06-02 1905-06-20 Ingersoll Sergeant Drill Co Compressor.
US2447741A (en) * 1944-12-12 1948-08-24 Baufre William Lane De Liquid oxygen pump
US2696785A (en) * 1949-03-11 1954-12-14 Blue Co John Metering pump for liquid anhydrous ammonia or other liquids
GB674669A (en) * 1949-04-16 1952-06-25 Linde Air Prod Co Apparatus for pumping a volatile liquid
US2837898A (en) * 1953-07-15 1958-06-10 Union Carbide Corp Differential plunger type liquefied gas pump
US2931313A (en) * 1955-06-24 1960-04-05 Joy Mfg Co Pump
US3036529A (en) * 1960-04-07 1962-05-29 Farley J Archer Pump
US3145629A (en) * 1960-12-13 1964-08-25 Union Carbide Corp Cryogenic pump sealing rings
US3136136A (en) * 1961-10-03 1964-06-09 Union Carbide Corp High-pressure pump for cryogenic fluids
US3160105A (en) * 1963-02-18 1964-12-08 Johnstone Pump Co Inc Pump for high viscosity fluids
US3220202A (en) * 1964-05-15 1965-11-30 Union Carbide Corp Apparatus for storing and pumping a volatile liquid
US3379132A (en) * 1965-08-16 1968-04-23 Integral Process Syst Inc Cryogenic pump
US3495544A (en) * 1967-08-30 1970-02-17 Binks Res & Dev Hydraulic system
CH615982A5 (en) * 1977-10-19 1980-02-29 Socsil Sa
US4396354A (en) * 1980-10-31 1983-08-02 Union Carbide Corporation Cryogenic pump and method for pumping cryogenic liquids
US4447195A (en) * 1982-02-22 1984-05-08 Air Products And Chemicals, Inc. High pressure helium pump for liquid or supercritical gas

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US464223A (en) * 1891-12-01 Ernest c

Also Published As

Publication number Publication date
ATE49629T1 (en) 1990-02-15
CA1250219A (en) 1989-02-21
US4639197A (en) 1987-01-27
DE3575454D1 (en) 1990-02-22
CH663065A5 (en) 1987-11-13
EP0174269A3 (en) 1987-03-25
EP0174269A2 (en) 1986-03-12

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