EP0045483A2 - Self-priming rotary pump, particularly for bringing liquids to their boiling point - Google Patents

Self-priming rotary pump, particularly for bringing liquids to their boiling point Download PDF

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Publication number
EP0045483A2
EP0045483A2 EP81105972A EP81105972A EP0045483A2 EP 0045483 A2 EP0045483 A2 EP 0045483A2 EP 81105972 A EP81105972 A EP 81105972A EP 81105972 A EP81105972 A EP 81105972A EP 0045483 A2 EP0045483 A2 EP 0045483A2
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EP
European Patent Office
Prior art keywords
storage space
centrifugal pump
liquid
liquid storage
stage
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
Application number
EP81105972A
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German (de)
French (fr)
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EP0045483A3 (en
EP0045483B1 (en
Inventor
Wilfried Dr. Ing. Lehmann
Peter Ing.-Grad Fandrey
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Sihi GmbH and Co KG
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Sihi GmbH and Co KG
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Priority to AT81105972T priority Critical patent/ATE5433T1/en
Publication of EP0045483A2 publication Critical patent/EP0045483A2/en
Publication of EP0045483A3 publication Critical patent/EP0045483A3/en
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Publication of EP0045483B1 publication Critical patent/EP0045483B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F04D5/003—Regenerative pumps of multistage type
    • F04D5/006—Regenerative pumps of multistage type the stages being axially offset

Definitions

  • the invention relates to a centrifugal pump with a first normal-suction centrifugal pump stage arranged on the suction side, a pump suction nozzle lying axially at shaft height and at least one downstream self-priming centrifugal pump stage working with auxiliary liquid.
  • Pumps of this type are known, in particular for conveying media close to their boiling point, for example liquid gases, where any flow loss on the pump suction side must be avoided in order to prevent cavitation in the first pump stage.
  • the suction port lying axially at the level of the shaft is intended to avoid sharp diversions of the inflowing medium inside the pump before the first stage. Starting from the suction port, the suction should Line are also led without major changes in direction to the container or tank to be pumped empty, in order to keep the flow losses in the feed line as low as possible.
  • the lack of sufficient self-priming and waste safety is now eliminated by arranging a liquid storage space of sufficient size between two pump stages, the connection to which is provided to the preceding centrifugal pump stage in the geodetically upper part of the storage space and wherein a seal for sealing between the liquid storage space and the preceding centrifugal pump stage the shaft gap is arranged.
  • the liquid storage space between the normal priming first stage and the first following self-priming centrifugal pump stage, whereby it is achieved that the largest possible proportion of liquid when the pump drops, i.e. when the liquid flows back from the pressure line through the pump into the suction-side container, it is retained in the pump itself, since a, albeit small, portion of liquid also remains in the self-priming gyro stages following the storage space.
  • this liquid is then conveyed within a short time to the last self-priming stage, which is known to take over the priming alone and is then available to this stage as operating fluid for the priming process.
  • the liquid storage space between two pump stages can now also be used according to the invention for the further purposes of liquid gas separation during the conveying process, in which case it is expediently arranged between the first and the second self-priming gyro stage and a connection for in the area of the geodetically highest point of this liquid storage space provides for an extraction line.
  • the arrangement of the liquid storage space at this point has the advantage that a large part of the liquid portion that may be outgassed on the suction side of the pump and in the suction line is already condensed again due to compression by the fully loaded stage and the first self-priming stage and only one at this point The rest of the gasified medium is contained in the flow.
  • This residual portion of gaseous medium can then be at the highest point in the Liquid supply space provided extraction line are returned to the suction-side tank or container, so that from the stages following the liquid storage space, only gas-free liquid is conveyed and leaves the pump pressure port.
  • a correspondingly optimally dimensioned cross-section of the line leading back from the liquid storage space to the container or tank also allows a possible proportion of liquid flowing back with the gas to be reduced to a minimum, so that the pump efficiency is only marginally or not at all influenced thereby.
  • this space In order to increase the separation effect in the liquid storage space, it is proposed to design this space as a liquid cooking separating and separating container by appropriate design and the installation of ribs.
  • These internals also have the additional advantage that they also fall off when the pump, i.e. when the liquid flows back after switching off from the pressure line through the pump back into the suction-side container, brake the backflow of the medium and thereby retain a particularly large part of the liquid in the pump part, which is connected downstream of the liquid storage space.
  • Self-priming centrifugal pump stages in the form of side channel stages have proven particularly suitable for use in such a pump, since they have optimal self-priming capability.
  • the axial extent of the liquid storage space should correspond approximately to the axial extent of a side channel step, since this retains sufficient liquid in the pump for the suction process.
  • the suction slot of the side channel pump stage following the liquid storage space is arranged in the geodetically lower area of the liquid storage space, so that the entire liquid supply of the storage space even when the pump is started up again, the self-priming stages as auxiliary or operating liquid for the Suction process is available.
  • the liquid storage space is expediently connected to a device for automatically checking the liquid level in the liquid storage space, which emits a signal or prevents the pump from being started up if the liquid storage space does not contain a sufficient amount of liquid. Furthermore, it can be expedient if a time relay is provided, which switches the pump off again after it has been switched on if the suction has not taken place within a certain predetermined period of time. These measures result in securing the pump against dry running.
  • the pump shaft is denoted by 1 and carries the fully loaded normal-suction rotary impeller 2 in the first pump stage, which is specially designed for optimal pumping speed, i.e. is designed for the lowest possible NPSH value of the pump, without placing particular value on the efficiency and delivery head of this first wheel.
  • the impellers of the following side channel stages are designated.
  • 4 is the pump suction housing with the suction port 5 and the inlet 6 arranged axially at shaft height.
  • the pump housing of the standard suction stage is designated 7
  • the housing parts of the following side channel pump stages are 8 and 9.
  • the pressure port 11 is located on the pump pressure housing 10 the pressure housing 10 still follows the mechanical seal or seal housing 12.
  • the liquid storage space 13 is provided, the transition to the first fully loaded centrifugal pump stage being arranged in the geodetically upper region of the liquid storage space, above the partition 14, which separates the liquid storage space from the first fully loaded centrifugal pump stage. Furthermore, between the housing part 15 forming the first storage space in the area of the shaft between this housing part and shaft 1, shaft seal 16 is provided, which prevents liquid in the area of the hub from passing from the liquid storage space or the pump stages that have been resettled into the first pump stage.
  • the liquid storage space 13 is arranged behind the first self-priming and in front of the second self-priming side-channel centrifugal pump stage, the connection from the fluid storage space to the preceding centrifugal pump stage again takes place in the geodetically upper area of the liquid storage space, above the partition 14, while between the shaft and the hub part of the housing 15 again a shaft seal 16 is arranged.
  • 13 ribs 17 are provided in the liquid storage space, which are intended to bring about a separation between gas and liquid in the storage space, a removal opening 18 being additionally arranged at the geodetically highest point of the storage space; for returning the gas components located in space 13 into the suction-side container or tank from which the pump draws in.
  • the self-priming pump stages are designed as side channel centrifugal pumps and the suction slot 19 of the side channel stage following the liquid storage space can be seen in the geodetically lowest point of the liquid storage space.
  • the pump shaft is supported in a slide bearing 20 and a ball bearing 21.
  • FIG. 3 shows the pump on the base plate 22 with the intake port 6, the housing part 7 of the first pump stage, the housing part 15 of the liquid storage space and the housing parts 8 and 9 of the following self-priming stage.
  • the pump is driven by an electric motor 23.
  • a device 26 for determining the liquid level in the liquid storage space is connected via connections 24, 25, the electrical energy of which is supplied by a battery 27.
  • Such devices for determining the liquid level are known and therefore do not need to be explained here tion.
  • the device is set so that it emits a signal when, when the pump is switched on, the liquid level in the liquid storage space is below a certain limit which must be reached if the liquid contained in the liquid storage space is to be sufficient for the suction process.
  • the pump motor 23 is either prevented from running automatically and / or the operator is made aware of the insufficient fluid level in the pump so that it can provide a refill.
  • the device 26 is set up in such a way that when a certain period of time has elapsed - for example 30 seconds - after the pump has started up, it is checked whether the pump has sucked in. If the suction has not taken place, the pump is switched off automatically.

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

Abstract

The invention relates to a centrifugal pump having a first centrifugal pump stage (2), which is located on the suction side and is not self-priming, and having a pump inlet nozzle (6), which is located axially at the level of the horizontal shaft (1), and having at least one centrifugal pump stage (3). which is located downstream and which, operating with the aid of auxiliary liquid, is self-priming. According to the invention, the self-priming capability and reliability of the pump, in particular for conveying media in the vicinity of their boiling point, are improved by arranging a liquid reservoir (13), of sufficient size, between two pump stages, the connection from this reservoir to the preceding centrifugal pump stage being located in the geodetically upper portion of the reservoir, and a seal (16) for closing the shaft clearance being located between the liquid reservoir (13) and the preceding centrifugal pump stage.

Description

Die Erfindung bezieht sich auf eine Kreiselpumpe mit einer saugseitig angeordneten ersten normalsaugenden Kreiselpumpenstufe, einem axial auf Wellenhöhe liegenden Pumpenansaugstutzen und mindestens einer nachgeschalteten selbstansaugenden mit Hilfsflüssigkeit arbeitenden Kreiselpumpenstufe.The invention relates to a centrifugal pump with a first normal-suction centrifugal pump stage arranged on the suction side, a pump suction nozzle lying axially at shaft height and at least one downstream self-priming centrifugal pump stage working with auxiliary liquid.

Pumpen dieser Art sind bekannt, insbesondere zur Förderung von Medien nahe an ihrem Siedepunkt, so z.B. Flüssiggasen, wo jeder Strömungsverlustauf der Pumpensaugseite vermieden werden muß, um Kavitation in der 1. Pumpenstufe zu verhindern. Der axial auf Wellenhöhe liegende Saugstutzen soll scharfe Umleitungen des einströmenden Mediums innerhalb der Pumpe, vor der ersten Stufe, vermeiden. Von dem Saugstutzen ausgehend soll die Saugleitung ebenfalls ohne große Richtungsänderungen zu dem leer zu pumpenden Behälter oder Tank geführt werden, um auch hier in der Zuführung die Strömungsverluste möglichst gering zu halten.Pumps of this type are known, in particular for conveying media close to their boiling point, for example liquid gases, where any flow loss on the pump suction side must be avoided in order to prevent cavitation in the first pump stage. The suction port lying axially at the level of the shaft is intended to avoid sharp diversions of the inflowing medium inside the pump before the first stage. Starting from the suction port, the suction should Line are also led without major changes in direction to the container or tank to be pumped empty, in order to keep the flow losses in the feed line as low as possible.

Waren diese Pumpen bisher meist so aufgestellt, daß sie geodätisch unter dem zu entleerenden Behälter installiert waren, d.h. daß sie stets mit Zulauf arbeiten konnten, so brauchte auf die Selbstansaugefähigkeit und Abfallsicherheit dieser Pumpe kein besonderer Wert gelegt zu werden. Lediglich die unter ungünstigen Betriebsverhältnissen auf Pumpensaugseite ausgasenden Flüssigkeitsanteile mußten durch die selbstansaugende(n) Kreiselstufe bzw. -Stufen abgesaugt und mitgefördert werden können.Until now, these pumps were usually installed so that they were installed geodetically under the container to be emptied, i.e. that they could always work with an inlet, there was no need to attach particular importance to the self-priming and waste safety of this pump. Only the liquid components that gas out under unfavorable operating conditions on the pump suction side had to be able to be sucked off and conveyed through the self-priming gyro stage or stages.

Infolge schärferer Sicherheitsbestimmungen geht man neuerdings jedoch häufig dazu über, die Behälter bzw. Tanks für z.B. Flüssiggase unterirdisch zu verlegen und steht so vor der Notwendigkeit, entweder eine entsprechend lange, sicher gekapselte, unzugängliche und konstruktiv aufwendige Tauchpumpe einzubauen, oder aber eine Pumpe im Saugbetrieb oberhalb des Behälters aufzustellen und diese dann entsprechend selbstansaugend und abfallsicher auszuführen. Die bisher bekannten Pumpen erfüllen diese letzten Forderungen nur sehr mangelhaft, da sie generell nach dem Stillstand und Abschalten bis zur Unterkante Saugstutzen leerlaufen und die dann in der Pumpe verbleibende Restflüssigkeit nicht mehr ausreicht, um bei Wiederinbetriebnahme eine sichere Entlüftung der Saugleitung und damit ein Wiederansaugen zu gewährleisten. Eine weitere Anforderung an die Förderung, insbesondere von Flüssiggasen, ist häufig die Abgabe blasen- bzw. gasfreien Mediums. Bei Pumpen, insbesondere wenn sie im Saugbereich unter schwierigen Saugbedingungen arbeiten müssen, läßt sich eine zumindest teilweise Verdampfung des Fördermediums im Saugbereich der Pumpe nicht verhindern, auch wenn diese Pumpen hinsichtlich des Saugvermögens optimal gestalted sind. Durch den Druckanstieg in der Pumpe wird zwar ein Teil des in der Saugleitung bzw. im Ansaugbereich der Pumpe ausgegasten Mediums wieder verflüssigt, sicherheitshalber muß jedoch bei solchen Pumpen noch ein Gasabscheider nachgeschaltet werden, um auch sicherzustellen, daß garantiert blasen- und gasfreies Medium von der Pumpe geliefert wird.As a result of stricter safety regulations, however, people are now frequently moving underground to store the tanks or tanks for, for example, liquefied gases, and are faced with the need to either install a suitably long, securely encapsulated, inaccessible and structurally complex pump, or a pump in suction mode Set up above the container and then carry it out accordingly self-priming and waste-proof. The pumps known to date meet these last requirements only very poorly, since they generally run empty up to the lower edge of the suction nozzle after standstill and shutdown and the residual liquid then remaining in the pump is no longer sufficient to ensure reliable ventilation of the suction line and thus re-suction when restarting guarantee. Another requirement for the promotion, especially of liquid gases, is often the delivery of bubbles or gas-free medium. With pumps, especially if they have to work in the suction area under difficult suction conditions, an at least partial evaporation of the pumped medium in the suction area of the pump cannot be prevented, even if these pumps are optimally designed with regard to the pumping speed. Due to the pressure increase in the pump, part of the gas that is outgassed in the suction line or in the suction area of the pump is liquefied again, but for safety's sake, a gas separator must be installed downstream in such pumps to ensure that bubble-free and gas-free medium is guaranteed from the Pump is delivered.

Erfindungsgemäß wird der Mangel an ausreichender Selbstansaugefähigkeit und Abfallsicherheit nun dadurch beseitigt, daß zwischen zwei Pumpenstufen ein Flüssigkeitsvorratsraum ausreichender Größe angeordnet ist, dessen Verbindung zur vorhergehenden Kreiselpumpenstufe im geodätisch oberen Teil des Vorratsraumes vorgesehen ist und wobei zwischen dem Flüssigkeitsvorratsraum und der vorhergehenden Kreiselpumpenstufe eine Dichtung zur Abdichtung des Wellenspaltes angeordnet ist. Dadurch erreicht man, daß, wenn beim Stillsetzen der Pumpe Flüssigkeit aus der Druckleitung durch die Pumpe und die Saugleitung in den saugseitigen Tank oder Behälter zurückströmt, genügend Flüssigkeit in der Pumpe zurückbehalten wird, um ein Wiederansaugen beim Wiedereinschalten zu ermöglichen. In dem eingebauten Flüssigkeitsvorratsraum kann nämlich die Flüssigkeit nur aus dem geodätisch oberen Teil ablaufen bis zur Unterkante des Ubertrittes zur vorhergehenden Stufe. Auch ein Zurückströmen entlang des Wellenspaltes wird verhindert durch die vorgesehene Dichtung in diesem Bereich zwischen dem Flüssigkeitsvorratsraum und der vorhergehenden Pumpenstufe.According to the invention, the lack of sufficient self-priming and waste safety is now eliminated by arranging a liquid storage space of sufficient size between two pump stages, the connection to which is provided to the preceding centrifugal pump stage in the geodetically upper part of the storage space and wherein a seal for sealing between the liquid storage space and the preceding centrifugal pump stage the shaft gap is arranged. This ensures that when the pump stops the liquid from the pressure line through the pump and the suction line back into the suction tank or container, enough liquid is retained in the pump to enable re-suction when restarting. In the built-in liquid storage space, the liquid can only drain from the geodetically upper part up to the lower edge of the transition to the previous step. Backflow along the shaft gap is also prevented by the seal provided in this area between the liquid storage space and the preceding pump stage.

In weiterer Ausführung des Erfindungsgedankens wird vorgeschlagen, den Flüssigkeitsvorratsraum zwischen der normalsaugenden ersten Stufe und der ersten folgenden selbstansaugenden Kreiselpumpenstufe anzuordnen, wodurch man erreicht, daß ein möglichst großer Flüssigkeitsanteil beim Abfallen der Pumpe, d.h. beim Zurückströmen der Flüssigkeit aus der Druckleitung durch die Pumpe in den saugseitigen Behälter, in der Pumpe selbst zurückgehalten wird, da in den dem Vorratsraum nachfolgenden selbstansaugenden Kreiselstufen ebenfalls ein, wenn auch nur geringer, Anteil Flüssigkeit zurückbleibt. Diese Flüssigkeit wird beim Wiederanstellen der Pumpe dann binnen kurzer Zeit in die letzte selbstansaugende Stufe gefördert, die bekanntlich allein das Ansaugen übernimmt und steht dieser Stufe dann als Betriebsflüssigkeit für den Ansaugvorgang zur Verfügung.In a further embodiment of the concept of the invention, it is proposed to arrange the liquid storage space between the normal priming first stage and the first following self-priming centrifugal pump stage, whereby it is achieved that the largest possible proportion of liquid when the pump drops, i.e. when the liquid flows back from the pressure line through the pump into the suction-side container, it is retained in the pump itself, since a, albeit small, portion of liquid also remains in the self-priming gyro stages following the storage space. When the pump is switched on again, this liquid is then conveyed within a short time to the last self-priming stage, which is known to take over the priming alone and is then available to this stage as operating fluid for the priming process.

Der Flüssigkeitsvorratsraum zwischen zwei Pumpenstufen angeordnet, läßt sich erfindungsgemäß nun auch noch zu den weiteren Zwecken der Flüssigkeitsgastrennung während des Fördervorganges benutzen, wobei man ihn dann zweckmäßigerweise zwischen der ersten und der zweiten selbstansaugenden Kreiselstufe angeordnet und im Bereich des geodätisch höchsten Punktes dieses Flüssigkeitsvorratsraumes einen Anschluß für eine Entnahmeleitung vorsieht. Die Anordnung des Flüssigkeitsvorratsraumes an dieser Stelle hat den Vorteil, daß ein großer Teil des auf der Saugseite der Pumpe und in der Saugleitung möglicherweise ausgegasten Flüssigkeitsanteiles infolge Verdichtung durch die vollbeaufschlagte Stufe und die erste selbstansaugende Stufe bereits wieder kondensiert ist und an dieser Stelle nur noch ein Rest vergastes Medium in dem Förderstrom enthalten ist. Dieser Restanteil von gasförmigem Medium kann dann über die im höchsten Punkt des Flüssigkeitsvorratsraumes vorgesehene Entnahmeleitung in den saugseitigen Tank oder Behälter zurückgeführt werden, so daß von den dem Flüssigkeitsvorratsraum folgenden Stufen, nur noch gasfreie Flüssigkeit gefördert wird und den Pumpendruckstutzen verläßt. Durch entsprechend optimal bemessenen Querschnitt der vom Flüssigkeitsvorratsraum zum Behälter bzw. Tank zurückführenden Leitung läßt sich auch ein möglicherweise mit dem Gas zurückströmender Flüssigkeitsanteil auf ein Minimum reduzieren, so daß der Pumpenwirkungsgrad dadurch nur unwesentlich oder überhaupt nicht spürbar beeinflußt wird.The liquid storage space between two pump stages can now also be used according to the invention for the further purposes of liquid gas separation during the conveying process, in which case it is expediently arranged between the first and the second self-priming gyro stage and a connection for in the area of the geodetically highest point of this liquid storage space provides for an extraction line. The arrangement of the liquid storage space at this point has the advantage that a large part of the liquid portion that may be outgassed on the suction side of the pump and in the suction line is already condensed again due to compression by the fully loaded stage and the first self-priming stage and only one at this point The rest of the gasified medium is contained in the flow. This residual portion of gaseous medium can then be at the highest point in the Liquid supply space provided extraction line are returned to the suction-side tank or container, so that from the stages following the liquid storage space, only gas-free liquid is conveyed and leaves the pump pressure port. A correspondingly optimally dimensioned cross-section of the line leading back from the liquid storage space to the container or tank also allows a possible proportion of liquid flowing back with the gas to be reduced to a minimum, so that the pump efficiency is only marginally or not at all influenced thereby.

Um den Abscheideeffekt in dem Flüssigkeitsvorratsraum zu erhöhen wird vorgeschlagen, diesen Raum durch entsprechende Gestaltung und den Einbau von Rippen speziell als FlüssigkeitsgarAbscheide- und -Trennbehälter auszubilden. Diese Einbauten haben darüber hinaus zusätzlich den Vorteil, daß sie auch beim Abfallen der Pumpe, d.h. beim Zurückströmen der Flüssigkeit nach dem Abschalten aus der Druckleitung durch die Pumpe in den saugseitigen Behälter zurück, den Rückfluß des Mediums bremsen und dadurch ein besonders großer Teil von Flüssigkeit in dem Pumpenteil, der dem Flüssigkeitsvorratsraum nachgeschaltet ist, zurückhalten.In order to increase the separation effect in the liquid storage space, it is proposed to design this space as a liquid cooking separating and separating container by appropriate design and the installation of ribs. These internals also have the additional advantage that they also fall off when the pump, i.e. when the liquid flows back after switching off from the pressure line through the pump back into the suction-side container, brake the backflow of the medium and thereby retain a particularly large part of the liquid in the pump part, which is connected downstream of the liquid storage space.

Besonders geeignet für die Verwendung in einer solchen Pumpe, haben sich selbstansaugende Kreiselpumpenstufen in Form von Seitenkanalstufen erwiesen, da sie eine optimale Selbstansaugefähigkeit besitzen. Die axiale Erstreckung des Flüssigkeitsvorratsraumes sollte in diesem Fall etwa der axialen Erstreckung einer Seitenkanalstufe entsprechen, da dadurch ausreichend Flüssigkeit zum Wiederansaugvorgang in der Pumpe zurückgehalten wird. Um die optimale Ansaugfähigkeit zu gewährleisten wird schließlich vorgeschlagen, daß der Saugschlitz der dem Flüssigkeitsvorratsraum folgenden Seitenkanalpumpenstufe im geodätisch unteren Bereich des Flüssigkeitsvorratsraumes angeordnet ist, damit der gesamte Flüssigkeitsvorrat des Vorratsraumes auch auch bei Wiederinbetriebnahme der Pumpe den selbstansaugenden Stufen als Hilfs- bzw. Betriebsflüssigkeit für den Ansaugvorgang zur Verfügung steht.Self-priming centrifugal pump stages in the form of side channel stages have proven particularly suitable for use in such a pump, since they have optimal self-priming capability. In this case, the axial extent of the liquid storage space should correspond approximately to the axial extent of a side channel step, since this retains sufficient liquid in the pump for the suction process. In order to ensure the optimal suction capacity, it is finally proposed that the suction slot of the side channel pump stage following the liquid storage space is arranged in the geodetically lower area of the liquid storage space, so that the entire liquid supply of the storage space even when the pump is started up again, the self-priming stages as auxiliary or operating liquid for the Suction process is available.

Zweckmäßigerweise ist der Flüssigkeitsvorratsraum mit einer Einrichtung zur selbsttätigen Kontrolle des Flüssigkeitsstandes im Flüssigkeitsvorratsraum verbunden, die ein Signal abgibt oder die Inbetriebnahme der Pumpe verhindert, wenn der Flüssigkeitsvorratsraum keine ausreichende Flüssigkeitmenge enthält. Ferner kann es zweckmäßig sein, wenn ein Zeitrelais vorgesehen ist, das die Pumpe nach dem Einschalten dann wieder abschaltet, wenn innerhalb einer bestimmten vorgegebenen Zeitspanne das Ansaugen nicht stattgefunden hat. Diese Maßnahmen ergeben eine Sicherung der Pumpe gegen Trockenlauf.The liquid storage space is expediently connected to a device for automatically checking the liquid level in the liquid storage space, which emits a signal or prevents the pump from being started up if the liquid storage space does not contain a sufficient amount of liquid. Furthermore, it can be expedient if a time relay is provided, which switches the pump off again after it has been switched on if the suction has not taken place within a certain predetermined period of time. These measures result in securing the pump against dry running.

Anhand der beigefügten Zeichnungen sei die Erfindung beispielsweise erläutert.The invention is explained, for example, with reference to the accompanying drawings.

  • Fig. 1 zeigt den Längsschnitt durch eine 5-stufige Kreiselpumpe, wobei der Flüssigkeitsvorratsraum hinter der ersten normalsaugenden Kreiselpumpenstufe angeordnet ist.1 shows the longitudinal section through a 5-stage centrifugal pump, the liquid storage space being arranged behind the first normal-suction centrifugal pump stage.
  • Fig. 2 zeigt ebenfalls den Längsschnitt durch eine 5-stufige Kreiselpumpe, bei der jedoch der Flüssigkeitsvorratsraum hinter der ersten selbstansaugenden Kreiselpumpenstufe angeordnet ist.FIG. 2 also shows the longitudinal section through a 5-stage centrifugal pump, in which, however, the liquid storage space is arranged behind the first self-priming centrifugal pump stage.
  • Fig. 3 zeigt eine perspektivische Darstellung der Pumpenanordnung.3 shows a perspective illustration of the pump arrangement.

In den Figuren ist die Pumpen welle mit 1 bezeichnet und trägt einmal das voll beaufschlagte normalsaugende Kreiselrad'2 in der ersten Pumpenstufe, das speziell für ein optimales Saugvermögen, d.h. für einen möglichst niedrigen NPSH-Wert der Pumpe ausgelegt ist, ohne auf Wirkungsgrad und Förderhöhe bei diesem ersten Rad besonderen Wert zu legen. Mit 3 sind die Flügelräder der folgenden Seitenkanalstufen bezeichnet. 4 ist das Pumpensauggehäuse mit dem Saugstutzen 5 und dem axial auf Wellenhöhe angeordneten Einlauf 6. Das Pumpengehäuse der normalsaugenden ersten Stufe ist mit 7 bezeichnet, die Gehäuseteile der folgenden Seitenkanalpumpenstufen mit 8 bzw. 9. Am Pumpendruckgehäuse 10 befindet sich der Druckstutzen 11. Anschließend an das Druckgehäuse 10 folgt noch das Gleitringdichtungs- oder Dichtungsgehäuse 12.In the figures, the pump shaft is denoted by 1 and carries the fully loaded normal-suction rotary impeller 2 in the first pump stage, which is specially designed for optimal pumping speed, i.e. is designed for the lowest possible NPSH value of the pump, without placing particular value on the efficiency and delivery head of this first wheel. With 3 the impellers of the following side channel stages are designated. 4 is the pump suction housing with the suction port 5 and the inlet 6 arranged axially at shaft height. The pump housing of the standard suction stage is designated 7, the housing parts of the following side channel pump stages are 8 and 9. The pressure port 11 is located on the pump pressure housing 10 the pressure housing 10 still follows the mechanical seal or seal housing 12.

In Fig.1 ist nun hinter der ersten vollbeaufschlagten Kreiselpumpenstufe der Flüssigkeitsvorratsraum 13 vorgesehen, dessen übertritt zur ersten vollbeaufschlagten Kreiselpumpenstufe im geodätisch oberen Bereich des Flüssigkeitsvorratsraumes angeordnet ist, oberhalb der Trennwand 14, die den Flüssigkeitsvorratsraum von der ersten vollbeaufschlagten Kreiselpumpenstufe trennt. Weiter sind zwischen dem den ersten Vorratsraum bildenden Gehäuseteil 15 im Bereich der Welle zwischen diesem Gehäuseteil und Welle 1 Wellendichtung 16 vorgesehen, die ein Übertreten von Flüssigkeit im Bereich der Nabe aus dem Flüssigkeitsvorratsraum oder den nachgeschlateten Pumpenstufen in die erste Pumpenstufe verhindern.In FIG. 1, behind the first fully loaded centrifugal pump stage, the liquid storage space 13 is provided, the transition to the first fully loaded centrifugal pump stage being arranged in the geodetically upper region of the liquid storage space, above the partition 14, which separates the liquid storage space from the first fully loaded centrifugal pump stage. Furthermore, between the housing part 15 forming the first storage space in the area of the shaft between this housing part and shaft 1, shaft seal 16 is provided, which prevents liquid in the area of the hub from passing from the liquid storage space or the pump stages that have been resettled into the first pump stage.

In Fig. 2 ist der Flüssigkeitsvorratsraum 13 hinter der ersten selbstansaugenden und vor der zweiten selbstansaugenden Seitenkanalkreiselpumpenstufe angeordnet, die Verbindung vom Flüssigkeitsvorratsraum zur vorhergehenden Kreiselpumpenstufe erfolgt wieder im geodätisch oberen Bereich des Flüssigkeitsvorratsraumes und zwar oberhalb der Trennwand 14, während zwischen Welle und Nabenteil des Gehäuses 15 wiederum eine Wellendichtung 16 angeordnet ist. Darüber hinaus sind im Flüssigkeitsvorratsraum 13 Rippen 17 vorgesehen, die eine Trennung zwischen Gas und Flüssigkeit im Vorratsraum bewirken sollen, wobei zusätzlich am geodätisch höchsten Punkt des Vorratsraumes noch eine Entnahmeöffnung 18 angeordnet ist; zur Rückführung der im Raum 13 befindlichen Gasanteile in den saugseitigen Behälter oder Tank aus dem die Pumpe ansaugt. Die selbstansaugenden Pumpenstufen sind in beiden Beispielen als Seitenkanalkreiselpumpen ausgeführt und der Saugschlitz 19 der dem Flüssigkeitsvorratsraum folgenden Seitenkanalstufe ist im geodätisch tiefsten Punkt des Flüssigkeitsvorratsraumes zu erkennen.2, the liquid storage space 13 is arranged behind the first self-priming and in front of the second self-priming side-channel centrifugal pump stage, the connection from the fluid storage space to the preceding centrifugal pump stage again takes place in the geodetically upper area of the liquid storage space, above the partition 14, while between the shaft and the hub part of the housing 15 again a shaft seal 16 is arranged. In addition, 13 ribs 17 are provided in the liquid storage space, which are intended to bring about a separation between gas and liquid in the storage space, a removal opening 18 being additionally arranged at the geodetically highest point of the storage space; for returning the gas components located in space 13 into the suction-side container or tank from which the pump draws in. In both examples, the self-priming pump stages are designed as side channel centrifugal pumps and the suction slot 19 of the side channel stage following the liquid storage space can be seen in the geodetically lowest point of the liquid storage space.

Zu erwähnen ist noch, daß die Pumpenwelle in einem Gleitlager 20 und einem Kugellager 21 gelagert wird.It should also be mentioned that the pump shaft is supported in a slide bearing 20 and a ball bearing 21.

In Fig.3 erkennt man auf der Grundplatte 22 die Pumpe mit dem Ansaugstutzen 6, dem Gehäuseteil 7 der ersten Pumpenstufe, dem Gehäuseteil 15 des Flüssigkeitsvorratsraums und den Gehäuseteilen 8 und 9 der folgenden selbstansaugenden Stufe. Die Pumpe wird angetrieben von einem Elektromotor 23. An den oberen bzw. unteren Teil des Gehäuseteils 15 des Flüssigkeitsvorratsraumes ist über Anschlüsse 24, 25 ein Gerät 26 zur Bestimmung des Flüssigkeitsstandes im Flüssigkeitsvorratsraum angeschlossen, dessen elektrische Energie von einer Batterie 27 geliefert wird. Derartige Geräte zur Feststellung des Flüssigkeitsstandes sind bekannt und bedürfen daher hier keiner Erläuterung. Das Gerät ist so eingestellt, daß es ein Signal abgibt, wenn beim Einschalten der Pumpe der Flüssigkeitsstand im Flüssigkeitsvorratsraum unterhalb einer bestimmten Grenze liegt, die erreicht werden muß, wenn die im Flüssigkeitsvorratsraum enthaltene Flüssigkeit für den Ansaugvorgang ausreichen soll. Wenn dieses Signal erscheint, wird entweder das Laufen des Pumpenmotors 23 selbsttätig verhindert und/oder es wird die Bedienungsperson auf den unzureichenden Flüssigkeitsstand in der Pumpe aufmerksam gemacht, damit sie für eine Auffüllung sorgen kann.3 shows the pump on the base plate 22 with the intake port 6, the housing part 7 of the first pump stage, the housing part 15 of the liquid storage space and the housing parts 8 and 9 of the following self-priming stage. The pump is driven by an electric motor 23. To the upper or lower part of the housing part 15 of the liquid storage space, a device 26 for determining the liquid level in the liquid storage space is connected via connections 24, 25, the electrical energy of which is supplied by a battery 27. Such devices for determining the liquid level are known and therefore do not need to be explained here tion. The device is set so that it emits a signal when, when the pump is switched on, the liquid level in the liquid storage space is below a certain limit which must be reached if the liquid contained in the liquid storage space is to be sufficient for the suction process. When this signal appears, the pump motor 23 is either prevented from running automatically and / or the operator is made aware of the insufficient fluid level in the pump so that it can provide a refill.

Außerdem ist das Gerät 26 so eingerichtet, daß selbsttätig bei Ablauf einer bestimmten Zeitperiode - beispielsweise 30 Sekunden - nach dem Anlaufen der Pumpe überprüft wird, ob die Pumpe angesaugt hat. Wenn das Ansaugen nicht stattgefunden hat, wird die Pumpe selbsttätig abgeschaltet.In addition, the device 26 is set up in such a way that when a certain period of time has elapsed - for example 30 seconds - after the pump has started up, it is checked whether the pump has sucked in. If the suction has not taken place, the pump is switched off automatically.

Entsprechendes gilt, wenn die Pumpe während des Betriebs abfällt, d.h. keine Flüssigkeit angesaugt wird.The same applies if the pump drops during operation, i.e. no liquid is sucked in.

Claims (8)

1. Kreiselpumpe mit einer saugseitig angeordneten ersten normalsaugenden Kreiselpumpenstufe, einem axial auf der Höhe der horizontalen Welle liegenden Pumpensaugstutzen und mindestens einer nachgeschlateten selbstansaugenden mit Hilfsflüssigkeit arbeitenden Kreiselpumpenstufe dadurch gekennzeichnet, daß zwischen zwei Pumpenstufen ein Flüssigkeitsvorratsraum ausreichender Größe angeordnet ist, dessen Verbindung zur vorhergehenden Kreiselpumpenstufe im geodätisch oberen Teil des Vorratsraumes angeordnet ist und wobei zwischen dem Flüssigkeitsvorratsraum und der vorhergehenden Kreiselpumpenstufe eine Dichtung zur Abdichtung des Wellenspaltes angeordnet ist.1. Centrifugal pump with a first standard suction centrifugal pump stage arranged on the suction side, a pump suction nozzle lying axially at the level of the horizontal shaft and at least one resettled self-priming centrifugal pump stage working with auxiliary liquid, characterized in that a liquid reservoir of sufficient size is arranged between two pump stages, the connection to the preceding centrifugal pump stage in the is arranged geodetically upper part of the storage space and wherein a seal for sealing the shaft gap is arranged between the liquid storage space and the preceding centrifugal pump stage. 2. Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß der Flüssigkeitsvorratsraum zwischen der normalsaugenden ersten Stufe und der folgenden ersten selbstansaugenden Kreiselpumpenstufe angeordnet ist.2. Centrifugal pump according to claim 1, characterized in that the liquid reservoir is arranged between the normal suction first stage and the following first self-priming centrifugal pump stage. 3. Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß der Flüssigkeitsvorratsraum zwischen der ersten und der zweiten selbstansaugenden Stufe und daß im Bereich des geodätisch höchsten Punktes des Flüssigkeitsvorratsraumes ein Anschluß für eine Entnahmeleitung angeordnet ist.3. Centrifugal pump according to claim 1, characterized in that the liquid storage space between the first and the second self-priming stage and that in the region of the geodetically highest point of the liquid storage space a connection for a sampling line is arranged. 4. Kreiselpumpe nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß der Flüssigkeitsvorratsraum durch entsprechende Gestaltung und den Einbau von Rippen als Flüssigkeits/ Gas-Abscheide- bzw. Trennbehälter ausgebildet ist.4. Centrifugal pump according to claim 1 to 3, characterized in that the liquid storage space is formed by appropriate design and the installation of fins as a liquid / gas separating or separating container. 5. Kreiselpumpe nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß die selbstansaugenden Kreiselpumpenstufen als Seitenkanalstufen ausgebildet sind und die axiale Erstreckung des Flüssigkeitsvorratsraumes etwa der axialen Erstreckung einer Seitenkanalstufe entspricht.5. Centrifugal pump according to claim 1 to 4, characterized in that the self-priming centrifugal pump stages are designed as side channel stages and the axial extent of the liquid storage space corresponds approximately to the axial extent of a side channel stage. 6. Kreiselpumpe nach Anspruch 5, dadurch gekennzeichnet, daß der Saugschlitz, der den Flüssigkeitsvorratsraum folgenden Seitenkanalpumpenstufe im geodätisch unteren Bereich des Flüssigkeitsvorratsraumes angeordnet ist.6. Centrifugal pump according to claim 5, characterized in that the suction slot, the side channel pump stage following the liquid storage space is arranged in the geodetically lower region of the liquid storage space. 7. Kreiselpumpe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Flüssigkeitsvorratsraum mit einer Einrichtung zur Feststellung des Flüssigkeitsstandes im Flüssigkeitsvorratsraum verbunden ist, die zur Abgabe eines Signals eingerichtet ist, wenn der Flüssigkeitsstand im Flüssigkeitsvorratsraum eine vorbestimmte Höhe unterschreitet.7. Centrifugal pump according to one of claims 1 to 6, characterized in that the liquid storage space is connected to a device for determining the liquid level in the liquid storage space, which is set up to emit a signal when the liquid level in the liquid storage space falls below a predetermined level. 8. Kreiselpumpe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Pumpe mit einer Einrichtung zur Feststellung der Flüssigkeitsfüllung im Flüssigkeitsvorratsraum verbunden ist, die zur Abgabe eines Signals eingerichtet ist, wenn die Pumpe innerhalb eines vorbestimmten Zeitintervalls nicht angesaugt hat.8. Centrifugal pump according to one of claims 1 to 7, characterized in that the pump is connected to a device for determining the liquid filling in the liquid storage space, which is set up to emit a signal when the pump has not sucked in within a predetermined time interval.
EP81105972A 1980-08-05 1981-07-29 Self-priming rotary pump, particularly for bringing liquids to their boiling point Expired EP0045483B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81105972T ATE5433T1 (en) 1980-08-05 1981-07-29 SELF-PRIMING CENTRIFUGAL PUMP, PARTICULARLY FOR PUMPING LIQUIDS NEAR THEIR BOILING POINT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3029604 1980-08-05
DE3029604 1980-08-05

Publications (3)

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EP0045483A2 true EP0045483A2 (en) 1982-02-10
EP0045483A3 EP0045483A3 (en) 1982-02-17
EP0045483B1 EP0045483B1 (en) 1983-11-23

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ID=6108913

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EP81105972A Expired EP0045483B1 (en) 1980-08-05 1981-07-29 Self-priming rotary pump, particularly for bringing liquids to their boiling point

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US (1) US4390317A (en)
EP (1) EP0045483B1 (en)
AT (1) ATE5433T1 (en)
AU (1) AU542218B2 (en)
CA (1) CA1165624A (en)
DK (1) DK149932C (en)
ES (1) ES504574A0 (en)
HK (1) HK39685A (en)
NZ (1) NZ197872A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3425656A1 (en) * 1984-07-12 1986-01-23 SERO Pumpenfabrik GmbH, 6922 Meckesheim CENTRIFUGAL PUMP
EP0222233A2 (en) * 1985-11-06 1987-05-20 KSB Aktiengesellschaft Multistage centrifugal pump for the transport of liquid gas
DE4113029A1 (en) * 1991-04-20 1992-10-22 Sihi Gmbh & Co Kg SELF-PRIMING CENTRIFUGAL PUMP FOR CONVEYING LIQUIDS NEAR YOUR BOILING POINT
WO1997008461A1 (en) * 1995-08-30 1997-03-06 Sterling Fluid Systems (Germany) Gmbh Regenerative pump

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553835B1 (en) * 1983-10-25 1986-02-28 Bertin & Cie FLUID COMPRESSION MACHINE WITH MULTIPLE SERIES COMPRESSION STAGES
DE3717058A1 (en) * 1987-05-21 1988-12-08 Bayer Ag MIXER FOR MIXING AT LEAST TWO FLOWABLE SUBSTANCES, ESPECIALLY UNDERSTANDING OR. INITIATING A REACTION DURING MIXING
DE4241406C2 (en) * 1992-12-09 2001-10-18 Bosch Gmbh Robert Blower housing
JPH0886298A (en) * 1994-09-19 1996-04-02 Hitachi Ltd Dry turbo vacuum pump
IT1398142B1 (en) * 2010-02-17 2013-02-14 Nuovo Pignone Spa SINGLE SYSTEM WITH COMPRESSOR AND INTEGRATED PUMP AND METHOD.
WO2014033317A1 (en) * 2012-09-03 2014-03-06 Sterling Industry Consult Gmbh Side-channel pump, and method for operating a side-channel pump
US11560902B2 (en) 2019-01-25 2023-01-24 Pentair Flow Technologies, Llc Self-priming assembly for use in a multi-stage pump

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DE711791C (en) * 1938-04-28 1941-10-07 Anna Dickow Geb Driemeyer Arrangement of the drive for a non-self-priming centrifugal pump
DE888207C (en) * 1951-08-10 1953-08-31 Siemens Ag Self-priming pump
DE1528826B2 (en) * 1951-01-28 1974-04-25 Siemen & Hinsch Mbh, 2210 Itzehoe

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US2553066A (en) * 1944-06-30 1951-05-15 Southern John Self-priming centrifugal pump
US3385225A (en) * 1965-06-29 1968-05-28 Siemen & Hinsch Gmbh Rotary pump
DE2534740C3 (en) * 1975-08-04 1983-02-03 Franz 4630 Bochum Klaus Canned centrifugal pump

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DE711791C (en) * 1938-04-28 1941-10-07 Anna Dickow Geb Driemeyer Arrangement of the drive for a non-self-priming centrifugal pump
DE1528826B2 (en) * 1951-01-28 1974-04-25 Siemen & Hinsch Mbh, 2210 Itzehoe
DE888207C (en) * 1951-08-10 1953-08-31 Siemens Ag Self-priming pump

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3425656A1 (en) * 1984-07-12 1986-01-23 SERO Pumpenfabrik GmbH, 6922 Meckesheim CENTRIFUGAL PUMP
AT402333B (en) * 1984-07-12 1997-04-25 Sero Pumpenfabrik Gmbh CENTRIFUGAL PUMP
EP0222233A2 (en) * 1985-11-06 1987-05-20 KSB Aktiengesellschaft Multistage centrifugal pump for the transport of liquid gas
EP0222233A3 (en) * 1985-11-06 1988-08-24 Klein, Schanzlin & Becker Aktiengesellschaft Multistage centrifugal pump for the transport of liquid gas
DE4113029A1 (en) * 1991-04-20 1992-10-22 Sihi Gmbh & Co Kg SELF-PRIMING CENTRIFUGAL PUMP FOR CONVEYING LIQUIDS NEAR YOUR BOILING POINT
WO1992018775A1 (en) * 1991-04-20 1992-10-29 Sihi Gmbh & Co Kg Self-priming rotary pump
WO1997008461A1 (en) * 1995-08-30 1997-03-06 Sterling Fluid Systems (Germany) Gmbh Regenerative pump
US6082960A (en) * 1995-08-30 2000-07-04 Sterling Fluid Systems Gmbh Regenerative pump

Also Published As

Publication number Publication date
HK39685A (en) 1985-05-31
ATE5433T1 (en) 1983-12-15
DK149932B (en) 1986-10-27
AU542218B2 (en) 1985-02-14
AU7369181A (en) 1982-02-11
CA1165624A (en) 1984-04-17
ES8206774A1 (en) 1982-08-16
US4390317A (en) 1983-06-28
ES504574A0 (en) 1982-08-16
NZ197872A (en) 1985-03-20
DK346881A (en) 1982-02-06
EP0045483A3 (en) 1982-02-17
EP0045483B1 (en) 1983-11-23
DK149932C (en) 1987-10-12

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