EP0174269A2 - Pump for cryogenic fluids - Google Patents
Pump for cryogenic fluids Download PDFInfo
- Publication number
- EP0174269A2 EP0174269A2 EP85810315A EP85810315A EP0174269A2 EP 0174269 A2 EP0174269 A2 EP 0174269A2 EP 85810315 A EP85810315 A EP 85810315A EP 85810315 A EP85810315 A EP 85810315A EP 0174269 A2 EP0174269 A2 EP 0174269A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- compressor
- pressure
- pump according
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 24
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Images
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.
- the invention has for its object to provide a pump according to the preamble of claim 1, which works on this principle but can be constructed more simply and cheaper and can produce less gas 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 view and the pump part 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.
- An annular plate valve 34 closes these openings during the pressure stroke.
- 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 like 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 attached, which is indicated by a dash-dotted line and is used for the brief release of the gas.
- the drawing shows the pump in a 45 ° inclined position relative to the vertical, which corresponds to a working position, because then the bore 51 in the pre-compressor cylinder is at the highest position.
- 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 low as possible gases forming from the fluid can rise and collect here.
- the pre-compression piston 6 can therefore almost exclusively bring 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 instead has a small amount of play against the inner wall of the cylinder, so that the excessive amount of fluid conveyed can escape here as well and thus does not cause unnecessarily high internal friction which 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 releases 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-compression piston therefore almost exclusively fills the high-pressure cylinder with liquid fluid. Due to the increased pressure, the gaseous express changes back into the liquid phase.
- the suction stroke has ended, the movement reverses and the high-pressure piston presses liquid fluid into the high-pressure line 37.
- the closable bore 74 is used to discharge the gas, especially when starting the pump parts when the various pump parts have not yet cooled down to near the low temperature of the fluid and a lot of gas is formed.
- the high pressure cylinder would only compress gas and not convey 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 in a liquid state to an overpressure of approx. 200 bar, 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Compressor (AREA)
- Thermotherapy And Cooling Therapy Devices (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Die cryogene Pumpe arbeitet zweistufig mit einem Vorverdichterteil und einem Hochdruckteil. Diese beiden Teile umfassen eine Hochdruck-Kolbenpumpe (3, 4, 34, 35) und eine Vorverdichterpumpe (5, 6, 61, 62) die in Tandem angeordnet sind und eine gemeinsame Kolbenstange 8 haben. Die Vorverdichterpumpe befindet sich in einem wärmeisoliertenn Zwischenbehälter (7) und drückt flüssiges cryogenes Fluid in den Hochdruckzylinder. Die Pumpe dient dazu flüssiges cryogenes Fluid, beispielsweise flüssigen Stickstoff unter hohem Druck durch einen Verdampfer hindurch zu druckfesten handelsüblichen Stahlflaschen zu fördern, die dann gasförmigen Stickstoff unter 200 atm Druck bei Umgebungstemperatur enthalten.The cryogenic pump works in two stages with a pre-compressor part and a high pressure part. These two parts comprise a high-pressure piston pump (3, 4, 34, 35) and a pre-compressor pump (5, 6, 61, 62) which are arranged in tandem and have a common piston rod 8. The pre-compressor pump is located in a thermally insulated intermediate container (7) and presses liquid cryogenic fluid into the high-pressure cylinder. The pump is used to convey liquid cryogenic fluid, for example liquid nitrogen under high pressure through an evaporator to pressure-resistant commercial steel bottles which then contain gaseous nitrogen under 200 atm pressure at 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.
- 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. Die hohe Vorverdichtung bewirkt entsprechende gasbildende Strömungen die mittels einem aufwendigen Ventilsystem aus den Niederdruckteil abgeleitet werden müssen. Solche Pumpen sind aber aufwendig und teuer in der Herstellung.For the latter solution, a pump with a stepped piston, a hollow piston rod and valves in the piston has become known from CH-PS 615,982. The high pre-compression causes corresponding gas-forming flows which have to be derived from the low-pressure part by means of a complex valve system. However, such pumps are 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 aufgebaut 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 can be constructed more simply and cheaper and can produce less gas 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 view and the pump part 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
Ansaugöffnungen 33 durchsetzen den Boden des Hochdruckzylinders. Während des Druckhubes schliesst ein ringförmiges Plattenventil 34 diese Oeffnungen. Die Auslassöffnung des Hochdruckzylinders ist mit einem federbelasteten Kugelventil 35 versehen. Der Hochdruckkolben 4 ist mit Dichtungsringen 36 versehen.
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
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 kurzzeitigen Ablassen des Gases dient.The double-walled intermediate container 7, designed like a Dewar vessel, is connected to the
Die Zeichnung zeigt die Pumpe in einer um 45° gegen die Vertikale geneigten Lage, die einer Arbeitslage entspricht, weil sich dann die Bohrung 51 im Vorverdichterzylinder an der höchsten Ste le 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 dem Fluid bildenden Gase aufsteigen und hier sammeln können. Der Vorverdichterkolben 6 kann demzufolge fast ausschliesslich flüssiges Fluid in den Hochdruckkolben bringen.The drawing shows the pump in a 45 ° inclined position relative to the vertical, which corresponds to a working position, because then the
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 Uebermass 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
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 freigbibt. 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 eil 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
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 the pump parts when the various pump parts have not yet cooled down to near the low temperature of the fluid and a lot of gas is formed. The high pressure cylinder would only compress gas and not convey 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 Ueberdruck 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 Ueberdruck 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
Claims (8)
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 true EP0174269A2 (en) | 1986-03-12 |
EP0174269A3 EP0174269A3 (en) | 1987-03-25 |
EP0174269B1 EP0174269B1 (en) | 1990-01-17 |
Family
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) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4917576A (en) * | 1987-03-28 | 1990-04-17 | Deutsche Forschungs- Und Versuchsanstalt Fur Luft Und Raumfahrt E.V. | Method and apparatus for conveying a liquid |
WO1991002160A1 (en) * | 1989-08-04 | 1991-02-21 | Kosan Crisplant A/S | A piston pump or compressor for handling both gas and wet gas, and a suction emptying system for lpg gas cylinders equipped with such a pump |
Families Citing this family (31)
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 |
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 |
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 |
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- 1985-02-04 US US06/697,756 patent/US4639197A/en not_active Expired - Lifetime
- 1985-03-29 CA CA000477932A patent/CA1250219A/en not_active Expired
- 1985-07-08 EP EP85810315A patent/EP0174269B1/en not_active Expired - Lifetime
- 1985-07-08 DE DE8585810315T patent/DE3575454D1/en not_active Expired - Lifetime
- 1985-07-08 AT AT85810315T patent/ATE49629T1/en not_active IP Right Cessation
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US464223A (en) * | 1891-12-01 | Ernest c | ||
GB674669A (en) * | 1949-04-16 | 1952-06-25 | Linde Air Prod Co | Apparatus for pumping a volatile liquid |
US2931313A (en) * | 1955-06-24 | 1960-04-05 | Joy Mfg Co | Pump |
US3036529A (en) * | 1960-04-07 | 1962-05-29 | Farley J Archer | Pump |
CH615982A5 (en) * | 1977-10-19 | 1980-02-29 | Socsil Sa | |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US4917576A (en) * | 1987-03-28 | 1990-04-17 | Deutsche Forschungs- Und Versuchsanstalt Fur Luft Und Raumfahrt E.V. | Method and apparatus for conveying a liquid |
WO1991002160A1 (en) * | 1989-08-04 | 1991-02-21 | Kosan Crisplant A/S | A piston pump or compressor for handling both gas and wet gas, and a suction emptying system for lpg gas cylinders equipped with such a pump |
Also Published As
Publication number | Publication date |
---|---|
EP0174269B1 (en) | 1990-01-17 |
CH663065A5 (en) | 1987-11-13 |
ATE49629T1 (en) | 1990-02-15 |
US4639197A (en) | 1987-01-27 |
DE3575454D1 (en) | 1990-02-22 |
CA1250219A (en) | 1989-02-21 |
EP0174269A3 (en) | 1987-03-25 |
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