EP0222233A2 - Multistage centrifugal pump for the transport of liquid gas - Google Patents

Multistage centrifugal pump for the transport of liquid gas Download PDF

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Publication number
EP0222233A2
EP0222233A2 EP86114824A EP86114824A EP0222233A2 EP 0222233 A2 EP0222233 A2 EP 0222233A2 EP 86114824 A EP86114824 A EP 86114824A EP 86114824 A EP86114824 A EP 86114824A EP 0222233 A2 EP0222233 A2 EP 0222233A2
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EP
European Patent Office
Prior art keywords
stage
centrifugal pump
chamber
relief
relief chamber
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Granted
Application number
EP86114824A
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German (de)
French (fr)
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EP0222233A3 (en
EP0222233B1 (en
Inventor
Jürgen Schill
Hans-Joachim Dr. Franke
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KSB AG
Original Assignee
KSB AG
Klein Schanzlin and Becker AG
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Priority to AT86114824T priority Critical patent/ATE59694T1/en
Publication of EP0222233A2 publication Critical patent/EP0222233A2/en
Publication of EP0222233A3 publication Critical patent/EP0222233A3/en
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Publication of EP0222233B1 publication Critical patent/EP0222233B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/083—Units comprising pumps and their driving means the pump being electrically driven for submerged use and protected by a gas-bell
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings

Definitions

  • the invention relates to a multi-stage centrifugal pump for conveying liquid gas, which is arranged in a container receiving liquid gas so that at least the first pump stage is constantly below the liquid level, and which is provided with a mechanical seal located behind the last pump stage and loaded with a sealing liquid , with the mechanical seal upstream of chokes and spaces in which the medium is converted into a gaseous state.
  • centrifugal pump When pumping liquefied gas, due to the conditions given by the system in the worst case, it can be assumed that the pumped medium at the inlet to the centrifugal pump is only under saturation pressure. Since a centrifugal pump can only work satisfactorily if the pressure in front of the impeller of its first stage is a certain amount above the saturation pressure of the medium, a special measure must be taken here:
  • the centrifugal pump is arranged in a container so that at least its first stage is constantly below the liquid level. The pressure of the liquid column located above the impeller, which is used in this way, ensures that no harmful cavitation occurs in the impeller.
  • the vertically arranged pot pump was particularly suitable for use under the conditions mentioned. However, this still had a serious problem: Since the drive shaft of the centrifugal pump was also located within the pump riser, the shaft seal to the atmosphere had to be designed for the final pressure of the pump. Mechanical seals were generally used for this. If the pressure to be sealed was now very high or there was a requirement that contamination of the delivery medium by the blocking medium of the mechanical seal be avoided, it had to be ensured that the gas phase of the delivery medium was present at the mechanical seal. This was achieved by throttling sections with subsequent larger rooms in which the liquid was converted into gas. For this purpose, however, a connection had to be made to a room of low pressure, in which the gas quantities were then continuously removed.
  • the invention has for its object to ensure the presence of the gas phase on the mechanical seal with little effort in a centrifugal pump of the type mentioned.
  • the excess gas can be discharged without problems, for example to the inlet connection of the container receiving the centrifugal pump, to the upper part of the container or pot, to a storage tank or via permanent degassing.
  • the blocking effect of the throttle section upstream of the collecting chamber, which is directed against the access of liquid medium, can be increased by means of conveying devices acting in the direction of the relief chamber, such as conveying thread or centripetal impeller.
  • the wall of the collecting room can be provided with ribs for the supply of external heat. It is also possible to arrange heating elements in and on the collecting room.
  • the centrifugal pump according to the invention can be arranged in a pot or, for example, several, standing or lying in a larger container.
  • a centrifugal pump (4) is arranged in a pot (1) which is provided with an inlet connection (2) and a pressure connection (3).
  • the centrifugal pump (4) has four pump stages.
  • the first pump stage (5) is located near the bottom of the pot (1). This is to ensure that it is always below the liquid level of the pumped medium entering the pot (1) via the inlet connection (2).
  • the first pump stage (5) is connected to the second pump stage (7) via a riser (6).
  • the other pump stages immediately follow the second.
  • a known type of relief device equipped with a relief piston (8) serves to relieve the axial thrust of the centrifugal pump (4).
  • the relief piston (8) forms a gap (9) with the housing of the centrifugal pump (4) surrounding it.
  • a relief chamber (10) is provided above the relief piston (8) and is connected to the second pump stage (7) via bores and a pipe (11). This connection ensures that liquid discharge medium is always present in the relief chamber (10) and that no steam is generated which would jeopardize the proper functioning of the relief device.
  • a collection space (12) is located above the relief space (10); In the connection between these two spaces, a feed thread (13) is provided which acts in the direction of the relief space (10).
  • the pressure generated by the delivery thread (13) when immersed in liquid has the result that liquid delivery medium is kept away from the collecting space 12.
  • the delivery thread (13) acts in a self-regulating manner due to the gas content of the collecting space (12); the leakage through the gap left by the conveying thread (13) is close to zero: a certain liquid level is established in the gap of the conveying thread (13) according to the counter pressure in the relief chamber (10).
  • the only slight leak in the collecting space (12) is gas that arises from boiling on the surface of the liquid in the gap. Excess gas is removed by a line (14) which is either designed as permanent degassing or which can lead to the inlet connection (2), to the upper part of the pot (1) or to a storage tank.
  • the leakage of sealing liquid occurring in the expansion chamber (15) is discharged via an outlet (17).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A liquefied gas pump wherein a vessel contains a supply of liquefied gas which is pumped from its inlet to its outlet by a multi-stage upright centrifugal pump whose first stage is immersed in the supply of liquefied gas in the vessel. The shaft seal at the upper end of the pump housing is held out of contact with liquefied gas by a first flow restrictor above the last stage of the pump, an expansion chamber which is filled with liquefied gas and is located above the first flow restrictor, a gas collecting chamber between the expansion chamber and the seal, and a second flow restrictor which is disposed between the two chambers and prevents penetration of liquefied gas from the expansion chamber into the collecting chamber. The latter is connected with the vessel and/or with a gas collecting tank. The expansion chamber is connected with the second and/or third stage of the pump in order to ensure that it is filled with liquefied gas.

Description

Die Erfindung betrifft eine mehrstufige Kreiselpumpe zur Förderung von Flüssiggas, welche in einem zulaufendes Flüssiggas aufnehmenden Behälter so angeordnet ist, daß zumindest die erste Pumpenstufe ständig unterhalb des Flüssigkeitsspiegels liegt, und welche mit einer hinter der letzten Pumpenstufe gelegenen, mit einer Sperrflüssigkeit beaufschlagten Gleitringdichtung versehen ist, wobei der Gleitringdichtung Drosselstrecken und Räume vorgeschaltet sind, in denen das Fördermedium in gasförmigen Zustand umgewandelt wird.The invention relates to a multi-stage centrifugal pump for conveying liquid gas, which is arranged in a container receiving liquid gas so that at least the first pump stage is constantly below the liquid level, and which is provided with a mechanical seal located behind the last pump stage and loaded with a sealing liquid , with the mechanical seal upstream of chokes and spaces in which the medium is converted into a gaseous state.

Bei der Förderung von Flüssiggas ist aufgrund der durch die Anlage gegebenen Bedingungen im ungünstigen Fall davon auszugehen, daß das Fördermedium am Zulauf zur Kreiselpumpe lediglich unter Sättigungsdruck steht. Da eine Kreiselpumpe aber nur dann zufriedenstellend arbeiten kann, wenn der Druck vor dem Laufrad ihrer ersten Stufe um ein bestimmtes Maß über dem Sättigungsdruck des Fördermediums liegt, muß hier eine besondere Maßnahme getroffen werden: Die Kreiselpumpe wird in einem Behälter so angeordnet, daß zumindest ihre erste Stufe ständig unterhalb des Füssigkeitsspiegels liegt. Der solchermaßen ausgenutzte Druck der oberhalb des Laufrades befindlichen Flüssigkeitssäule stellt sicher, daß keine schädliche Kavitation im Laufrad auftritt.When pumping liquefied gas, due to the conditions given by the system in the worst case, it can be assumed that the pumped medium at the inlet to the centrifugal pump is only under saturation pressure. Since a centrifugal pump can only work satisfactorily if the pressure in front of the impeller of its first stage is a certain amount above the saturation pressure of the medium, a special measure must be taken here: The centrifugal pump is arranged in a container so that at least its first stage is constantly below the liquid level. The pressure of the liquid column located above the impeller, which is used in this way, ensures that no harmful cavitation occurs in the impeller.

Für den Einsatz unter den genannten Bedingungen bot sich vor allem die vertikal angeordnete Topfpumpe an. Diese barg allerdings noch ein schwerwiegendes Problem:
Da sich innerhalb der Pumpensteigleitung auch die Antriebswelle der Kreiselpumpe befand, mußte die Wellenabdichtung zur Atmosphäre für den Enddruck der Pumpe ausgelegt werden. Hierfür wurden generell Gleitringdichtungen verwendet. War nun der abzudichtende Druck sehr hoch oder bestand die Forderung, daß eine Verunreinigung des Fördermediums durch das Sperr­medium der Gleitringdichtung zu vermeiden sei, so mußte sichergestellt werden, daß die Gasphase des Fördermediums an der Gleitringdichtung anstand. Man erreichte dies durch Drossel­strecken mit anschließenden größeren Räumen, in denen die Flüssigkeit in Gas umgewandelt wurde. Hierzu mußte allerdings eine Verbindung mit einem Raum niederen Druckes hergestellt werden, in welchen dann die anfallenden Gasmengen ständig abgeführt wurden. Der Umstand, daß bei dieser Art der Entspannung des Fördermediums sehr große Gasmengen anfielen, ließ diese Lösung scheitern: Eine Rückführung in die zur Kreiselpumpe führende Rohrleitung war wegen der Menge nicht möglich; eine Rückführung in den Vorratsbehälter war meist mit einem großen Verrohrungsaufwand verbunden.The vertically arranged pot pump was particularly suitable for use under the conditions mentioned. However, this still had a serious problem:
Since the drive shaft of the centrifugal pump was also located within the pump riser, the shaft seal to the atmosphere had to be designed for the final pressure of the pump. Mechanical seals were generally used for this. If the pressure to be sealed was now very high or there was a requirement that contamination of the delivery medium by the blocking medium of the mechanical seal be avoided, it had to be ensured that the gas phase of the delivery medium was present at the mechanical seal. This was achieved by throttling sections with subsequent larger rooms in which the liquid was converted into gas. For this purpose, however, a connection had to be made to a room of low pressure, in which the gas quantities were then continuously removed. The fact that very large amounts of gas were produced with this type of expansion of the delivery medium made this solution fail: Because of the amount, it was not possible to return it to the pipeline leading to the centrifugal pump; a return to the storage container was usually associated with a great piping effort.

Um das aufgezeigte Problem zu vermeiden, änderte man nun die Durchflußrichtung der Topfpumpe: Der unten im Topf befindlichen Kreiselpumpe wurde das Fördermedium durch eine Falleitung zugeführt. Da das Fördermedium siedend in die Pumpe strömte, konnte man die Gasphase an der Gleitringdichtung relativ einfach herstellen. Da aber nun der Topf das aus der Kreiselpumpe kommende Fördermedium aufnehmen mußte, hatte dieser einem wesentlich höheren Druck standzuhalten. Er war daher aus hochwertigem Material herzustellen und er wurde vergleichsweise schwer. Noch ernster war aber der Umstand zu nehmen, daß die sich im Fördermedium befindlichen Lager durch eine siedende Flüssigkeit nicht mehr ordnungsgemäß geschmiert werden konnten. Hieraus konnten sich überdies Rotor- und Falleitungsschwingungen ergeben, die wiederum zum Material­bruch und damit zum Ausfall der Fördereinrichtung führen konnten.In order to avoid the problem shown, the flow direction of the pot pump was now changed: The centrifugal pump located at the bottom of the pot was supplied with the pumped medium through a downpipe. Since the pumped medium flowed boiling into the pump, it was relatively easy to create the gas phase on the mechanical seal. However, since the pot now had to take up the medium coming from the centrifugal pump, it had to withstand a much higher pressure. It was therefore made of high quality material and it became comparative heavy. Even more serious was the fact that the bearings in the fluid could no longer be properly lubricated by a boiling liquid. This could also result in rotor and downpipe vibrations, which in turn could lead to material breakage and thus failure of the conveyor.

Der Erfindung liegt die Aufgabe zugrunde, bei einer Kreiselpumpe der eingangs genannten Art das Vorhandensein der Gasphase an der Gleitringdichtung mit geringem Aufwand sicherzustellen.The invention has for its object to ensure the presence of the gas phase on the mechanical seal with little effort in a centrifugal pump of the type mentioned.

Der Lösung dieser Aufgabe dienen die im Anspruch 1 genannten Merkmale.The features mentioned in claim 1 serve to solve this problem.

Diese Lösung ist vor allem für solche Kreiselpumpen geeignet, bei denen der hydraulische Axialschub durch Einzelradentlastung weitgehend ausgeglichen wird. Bei einer Axialschubentlastung mittels Entlastungskolben bietet es sich dagegen an, die Funktion der der letzten Pumpenstufe nachgeschalteten Drosselstrecke von dem zwischen Entlastungskolben und Gehäuse gebildeten Spalt übernehmen zu lassen. Um sicherzustellen, daß der Entlastungs­raum stets mit flüssigem Fördermedium gefüllt ist, was für die Funktion des Entlastungskolbens wichtig ist, ist im übrigen eine Verbindung des Entlastungsraumes mit einem Raum vorgesehen, dessen Druck oberhalb des Sättigungsdruckes des Fördermediums liegt. Hier ist vor allem an die zweite oder dritte Pumpenstufe zu denken.This solution is particularly suitable for centrifugal pumps in which the hydraulic axial thrust is largely compensated for by individual wheel relief. In the case of axial thrust relief by means of a relief piston, on the other hand, it makes sense to have the function of the throttle section downstream of the last pump stage taken over by the gap formed between the relief piston and the housing. To ensure that the relief chamber is always filled with liquid medium, which is important for the function of the relief piston, a connection of the relief chamber is provided with a space whose pressure is above the saturation pressure of the medium. The second or third pump stage is particularly important here.

Da die im Sammelraum anfallenden Gasmengen aufgrund der starken Drosselwirkung der vorgeschalteten Drosselstrecke nur noch gering sind, kann das überschüssige Gas ohne Probleme abgeführt werden, beispielsweise zum Zulaufstutzen des die Kreiselpumpe aufnehmenden Behälters, zum Oberteil des Behälters bzw. Topfes, zu einem Lagertank oder über eine Permanententgasung.Since the gas quantities accumulating in the collecting space are only due to the strong throttling effect of the upstream throttle section are low, the excess gas can be discharged without problems, for example to the inlet connection of the container receiving the centrifugal pump, to the upper part of the container or pot, to a storage tank or via permanent degassing.

Die gegen den Zutritt von flüssigem Fördermedium gerichtete Sperrwirkung der dem Sammelraum vorgeschalteten Drossel­strecke kann noch durch in Richtung des Entlastungsraumes wirkende Fördereinrichtungen, wie Fördergewinde oder Zentripetal-­Laufrad, gesteigert werden.The blocking effect of the throttle section upstream of the collecting chamber, which is directed against the access of liquid medium, can be increased by means of conveying devices acting in the direction of the relief chamber, such as conveying thread or centripetal impeller.

Um sicherzustellen, daß auch unter schwierigsten Bedingungen nur Gas im Sammelraum vorhanden ist, kann diesem zusätzlich Wärme zugeführt werden, durch die vorhandenes flüssiges Fördermedium verdampft wird. Für die Zuführung von Außenwärme kann die Wand des Sammelraumes mit Rippen versehen werden. Es ist auch möglich, Heizelemente im und am Sammelraum anzuordnen.In order to ensure that only gas is present in the collecting space even under the most difficult conditions, additional heat can be supplied to the latter, through which the liquid medium being conveyed is evaporated. The wall of the collecting room can be provided with ribs for the supply of external heat. It is also possible to arrange heating elements in and on the collecting room.

Die erfindungsgemäße Kreiselpumpe kann in einem Topf oder, beispielsweise zu mehreren, in einem größeren Behälter stehend oder liegend angeordnet werden.The centrifugal pump according to the invention can be arranged in a pot or, for example, several, standing or lying in a larger container.

Anhand eines Ausführungsbeispiels wird die Erfindung näher erläutert. Die Zeichnung zeigt in

  • Fig. 1 eine vertikal angeordnete Topfpumpe gemäß der Erfindung in Schnittdarstellung, und in
  • Fig. 2 einen vergrößerten Ausschnitt aus der Pumpe der Fig. 1.
The invention is explained in more detail using an exemplary embodiment. The drawing shows in
  • Fig. 1 shows a vertically arranged pot pump according to the invention in a sectional view, and in
  • FIG. 2 shows an enlarged detail from the pump of FIG. 1.

In einem Topf(1), der mit einem Zulaufstutzen (2) und einem Druckstutzen (3) versehen ist, ist eine Kreiselpumpe (4) angeordnet. Die Kreiselpumpe (4) besitzt vier Pumpenstufen. Die erste Pumpenstufe (5) befindet sich in der Nähe des Bodens des Topfes (1). Hierduch soll sichergestellt werden, daß sie sich stets unterhalb des Flüssigkeitsspiegels des über den Zulaufstutzen (2) in den Topf (1) gelangenden Fördermediums befindet.A centrifugal pump (4) is arranged in a pot (1) which is provided with an inlet connection (2) and a pressure connection (3). The centrifugal pump (4) has four pump stages. The first pump stage (5) is located near the bottom of the pot (1). This is to ensure that it is always below the liquid level of the pumped medium entering the pot (1) via the inlet connection (2).

Über eine Steigleitung (6) ist die erste Pumpenstufe (5) mit der zweiten Pumpenstufe (7) verbunden. Die weiteren Pumpenstufen folgen der zweiten unmittelbar.The first pump stage (5) is connected to the second pump stage (7) via a riser (6). The other pump stages immediately follow the second.

Der Axialschubentlastung der Kreiselpumpe (4) dient eine mit einem Entlastungskolben (8) ausgestattete Entlastungseinrichtung bekannter Art. Mit dem ihn umgebenden Gehäuse der Kreisel­pumpe (4) bildet der Entlastungskolben (8) einen Spalt (9).A known type of relief device equipped with a relief piston (8) serves to relieve the axial thrust of the centrifugal pump (4). The relief piston (8) forms a gap (9) with the housing of the centrifugal pump (4) surrounding it.

Oberhalb des Entlastungskolbens (8) ist ein Entlastungsraum (10) vorgesehen, der über Bohrungen und eine Rohrleitung (11) mit der zweiten Pumpenstufe (7) in Verbindung steht. Diese Verbindung stellt sicher, daß im Entlastungsraum (10) stets flüssiges Fördermedium vorhanden ist und daß kein Dampf entsteht, der die einwandfreie Funktion der Entlastungseinrichtung gefährden würde.A relief chamber (10) is provided above the relief piston (8) and is connected to the second pump stage (7) via bores and a pipe (11). This connection ensures that liquid discharge medium is always present in the relief chamber (10) and that no steam is generated which would jeopardize the proper functioning of the relief device.

Oberhalb des Entlastungsraumes (10) befindet sich ein Sammel­raum (12); in der Verbindung zwischen diesen beiden Räumen ist ein in Richtung des Entlastungsraumes (10) wirkendes Förder­gewinde (13) vorgesehen. Der bei einem Eintauchen in Flüssigkeit durch das Fördergewinde (13) erzeugte Druck hat zur Folge, daß flüssiges Fördermedium vom Sammelraum 12 ferngehalten wird. Das Fördergewinde (13) wirkt aufgrund des Gasinhaltes des Sammelraumes (12) selbstregulierend; die Leckage durch den vom Fördergewinde (13) belassenen Spalt geht gegen Null: Entsprechend dem Gegendruck im Entlastungsraum (10) stellt sich im Spalt des Fördergewindes (13) eine bestimmte Flüssigkeitshöhe ein. Als geringfügige Leckage in den Sammel­raum (12) kommt nur noch Gas in Frage, das durch Sieden an der Oberfläche der Flüssigkeit im Spalt entsteht. Der Abführung überschüssigen Gases dient eine Leitung (14), die entweder als Permanententgasung ausgelegt ist oder die zum Zulaufstutzen (2), zum Oberteil des Topfes (1) oder zu einem Lagertank führen kann.A collection space (12) is located above the relief space (10); In the connection between these two spaces, a feed thread (13) is provided which acts in the direction of the relief space (10). The pressure generated by the delivery thread (13) when immersed in liquid has the result that liquid delivery medium is kept away from the collecting space 12. The delivery thread (13) acts in a self-regulating manner due to the gas content of the collecting space (12); the leakage through the gap left by the conveying thread (13) is close to zero: a certain liquid level is established in the gap of the conveying thread (13) according to the counter pressure in the relief chamber (10). The only slight leak in the collecting space (12) is gas that arises from boiling on the surface of the liquid in the gap. Excess gas is removed by a line (14) which is either designed as permanent degassing or which can lead to the inlet connection (2), to the upper part of the pot (1) or to a storage tank.

An den Sammelraum (12) schießt sich ein Entspannungsraum (15) an, der einer - hier nur schematisch dargestellten - Gleitring­dichtung (16) vorgeschaltet ist. Über einen Auslaß (17) wird die im Entspannungsraum (15) anfallende Leckage an Sperrflüssigkeit abgeführt.A relaxation space (15) adjoins the collecting space (12), which is connected upstream of a mechanical seal (16), which is only shown schematically here. The leakage of sealing liquid occurring in the expansion chamber (15) is discharged via an outlet (17).

Claims (7)

1. Mehrstufige Kreiselpumpe zur Förderung von Flüssiggas, welche in einem zulaufendes Flüssiggas aufnehmenden Behälter so angeordnet ist, daß zumindest die erste Pumpenstufe ständig unterhalb des Flüssigkeitsspiegels liegt, und welche mit einer hinter der letzten Pumpenstufe gelegenen, mit einer Sperrflüssigkeit beaufschlagten Gleitringdichtung versehen ist, wobei der Fleitringdichtung Drosselstrecken und Räume vorgeschaltet sind, in denen das Fördermedium in gasförmigen Zustand umgewandelt wird, gekennzeichnet durch einen der letzten Pumpenstufe nachgeschalteten und über eine Drossel­strecke (9) mit dieser verbundenen Entlastungsraum (10), einen daran anschließenden Sammelraum (12), der über eine den Durchtritt von flüssigem Fördermedium verhindernde Drossel­strecke (13) mit dem Entlastungsraum (10) und über Bohrungen und/oder eine Rohrleitung (14) mit einem unter dem Siededruck des Fördermediums stehenden Raum verbunden ist, sowie einen der Gleitringdichtung (16) vorgeschalteten Entspannungsraum (15), der mit einem zeitweise oder ständig geöffneten Abfluß (17) für die Sperrflüssigkeitsleckage versehen ist.1.Multi-stage centrifugal pump for conveying liquid gas, which is arranged in a container receiving liquid gas so that at least the first pump stage is constantly below the liquid level, and which is provided with a mechanical seal which is located behind the last pump stage and acted on with a sealing liquid, whereby Throttle sections and spaces in which the pumped medium is converted into a gaseous state are connected upstream of the mechanical seal, characterized by a relief chamber (10) connected downstream of the last pump stage and connected to it via a throttle section (9), and an adjoining collecting space (12) which a throttle section (13) preventing the passage of liquid medium is connected to the relief chamber (10) and via bores and / or a pipeline (14) to a chamber under the boiling pressure of the medium, as well as an expansion device connected upstream of the mechanical seal (16) Nominal space (15) which is provided with a temporarily or continuously open drain (17) for the sealing liquid leakage. 2. Mehrstufige Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die zwischen der letzten Pumpenstufe und dem Entlastungsraum (10) gelegene Drosselstrecke durch einen Spalt (9) gebildet wird, der zwischen einem der Axial­schubentlastung dienenden Entlastungskolben (8) und dem ihn umgebenden Gehäuse vorhanden ist, wobei der mit Förder­medium gefüllte Entlastungsraum (10) über Bohrungen und/oder Rohrleitungen (11) mit einem Raum verbunden ist, dessen Druck oberhalb des Sättigungsdruckes des Förder­mediums liegt.2. Multi-stage centrifugal pump according to claim 1, characterized in that the throttle section between the last pump stage and the relief chamber (10) a gap (9) is formed which is present between a relief piston (8) serving to relieve the axial thrust and the housing surrounding it, the relief space (10) filled with pumped medium being connected to a space via bores and / or pipes (11), whose pressure is above the saturation pressure of the medium. 3. Mehrstufige Kreiselpumpe nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der Entlastungsraum (10) mit der zweiten Pumpenstufe (7) verbunden ist.3. Multi-stage centrifugal pump according to claims 1 and 2, characterized in that the relief chamber (10) is connected to the second pump stage (7). 4. Mehrstufige Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß zwischen dem Entlastungsraum (10) und dem Sammelraum (12) ein in Richtung des Entlastungsraumes (10) förderndes Fördergewinde (13) angeordnet ist.4. Multi-stage centrifugal pump according to claim 1, characterized in that between the relief chamber (10) and the collecting chamber (12) in the direction of the relief chamber (10) conveying thread (13) is arranged. 5. Mehrstufige Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß zwischen dem Entlastungsraum (10) und dem Sammelraum (12) ein in Richtung des Entlastungsraumes (10) förderndes Zentripetal-Laufrad angeordnet ist.5. Multi-stage centrifugal pump according to claim 1, characterized in that between the relief chamber (10) and the collection chamber (12) in the direction of the relief chamber (10) promoting centripetal impeller is arranged. 6. Mehrstufige Kreiselpumpe nach Anspruch 1 und einem oder mehreren der folgenden Ansprüche, dadurch gekennzeichnet, daß die Wand des Sammelraumes (12) mit mehreren innen und/oder außen angeordneten, der Wärmeübertragung dienenden Rippen versehen ist.6. Multi-stage centrifugal pump according to claim 1 and one or more of the following claims, characterized in that the wall of the collecting space (12) is provided with a plurality of ribs arranged inside and / or outside and used for heat transfer. 7. Mehrstufige Kreiselpumpe nach Anspruch 1 und einem oder mehreren der folgenden Ansprüche, gekennzeichnet durch in und/oder am Sammelraum (12) angeordnete Heizelemente.7. Multi-stage centrifugal pump according to claim 1 and one or more of the following claims, characterized by heating elements arranged in and / or on the collecting space (12).
EP86114824A 1985-11-06 1986-10-24 Multistage centrifugal pump for the transport of liquid gas Expired - Lifetime EP0222233B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114824T ATE59694T1 (en) 1985-11-06 1986-10-24 MULTISTAGE CENTRIFUGAL PUMP FOR PUMPING LIQUID GAS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853539251 DE3539251A1 (en) 1985-11-06 1985-11-06 MULTI-STAGE CENTRIFUGAL PUMP FOR CONVEYING LIQUID GAS
DE3539251 1985-11-06

Publications (3)

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EP0222233A2 true EP0222233A2 (en) 1987-05-20
EP0222233A3 EP0222233A3 (en) 1988-08-24
EP0222233B1 EP0222233B1 (en) 1991-01-02

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Application Number Title Priority Date Filing Date
EP86114824A Expired - Lifetime EP0222233B1 (en) 1985-11-06 1986-10-24 Multistage centrifugal pump for the transport of liquid gas

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US (1) US4753571A (en)
EP (1) EP0222233B1 (en)
AT (1) ATE59694T1 (en)
DE (1) DE3539251A1 (en)

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EP3199859A1 (en) * 2016-01-29 2017-08-02 Cryostar SAS Submersible pump assembly for dispensing liquefied gas
CN109185175A (en) * 2018-10-12 2019-01-11 东莞宏剑工业设备有限公司 Brush DC magnetic drive pump

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EP0669466B1 (en) * 1994-02-23 2000-05-24 Ebara Corporation Turboexpander pump unit
DE19501900A1 (en) * 1995-01-23 1996-07-25 Klein Schanzlin & Becker Ag Mechanical seal for boiler feed pumps

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EP3199859A1 (en) * 2016-01-29 2017-08-02 Cryostar SAS Submersible pump assembly for dispensing liquefied gas
WO2017129389A1 (en) * 2016-01-29 2017-08-03 Cryostar Sas Set for dispensing liquefied gas
RU2727773C2 (en) * 2016-01-29 2020-07-24 Криостар Сас Liquefied gas distribution kit
US10955089B2 (en) 2016-01-29 2021-03-23 Cryostar Sas Set for dispensing liquefied gas
CN109185175A (en) * 2018-10-12 2019-01-11 东莞宏剑工业设备有限公司 Brush DC magnetic drive pump

Also Published As

Publication number Publication date
EP0222233A3 (en) 1988-08-24
US4753571A (en) 1988-06-28
EP0222233B1 (en) 1991-01-02
ATE59694T1 (en) 1991-01-15
DE3539251A1 (en) 1987-05-14
DE3539251C2 (en) 1987-12-03

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