EP0075100B2 - Multistage centrifugal pump - Google Patents

Multistage centrifugal pump Download PDF

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Publication number
EP0075100B2
EP0075100B2 EP82107260A EP82107260A EP0075100B2 EP 0075100 B2 EP0075100 B2 EP 0075100B2 EP 82107260 A EP82107260 A EP 82107260A EP 82107260 A EP82107260 A EP 82107260A EP 0075100 B2 EP0075100 B2 EP 0075100B2
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EP
European Patent Office
Prior art keywords
container
pump
centrifugal pump
housing
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82107260A
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German (de)
French (fr)
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EP0075100A1 (en
EP0075100B1 (en
Inventor
Wilfried Dr.Ing. Lehmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sihi GmbH and Co KG
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Sihi GmbH and Co KG
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6141422&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0075100(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sihi GmbH and Co KG filed Critical Sihi GmbH and Co KG
Priority to AT82107260T priority Critical patent/ATE12814T1/en
Publication of EP0075100A1 publication Critical patent/EP0075100A1/en
Publication of EP0075100B1 publication Critical patent/EP0075100B1/en
Application granted granted Critical
Publication of EP0075100B2 publication Critical patent/EP0075100B2/en
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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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid 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
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/02—Self-priming pumps

Definitions

  • the invention relates to a multi-stage centrifugal pump with a vertical shaft and a multi-member link housing for conveying liquids near their boiling point, which dips with its lower, suction-side end into a pot for the supply of liquid, above which the pump drive and the pressure line connection accessible (DE-A-1 703 529).
  • a pump for the circulation of a medium under high pressure, which encompasses all pump stages within a pressure-resistant housing, which consists of a pot-like lower part receiving the pump and an upper part receiving the drive Has pump housing which is connected to the pressure-resistant housing by means of an annular flange arranged thereon.
  • the invention has for its object to provide a centrifugal pump that allows the improvement of the inlet conditions demand of liquids near their boiling point with simple means using series pumps.
  • the solution according to the invention is that the housing member of the second or a further pump stage is designed with an annular flange as the lid of the pot, on which the inlet nozzle accessible above the pot is arranged.
  • the ring flange is preferably arranged on the housing member of the last or penultimate stage so that the pump protrudes as deeply as possible into the pot.
  • Either the inlet connector can be directly connected to the lid (for example welded), or an attachment option for the inlet connector is provided on the lid.
  • the liquid calming can be improved even further according to the invention by arranging flow guide ribs in the pot, which preferably run away from the pot lid.
  • the arrangement of flow guide ribs is particularly expedient when the pump is not arranged centrally in the pot.
  • the distance between the pump inlet and the wall of the pot opposite the pump inlet should be at least equal to the diameter of the pump inlet.
  • This cover carries the pump 2 with a vertical axis by being designed as a housing member 6 of the third stage of a total of four pump stages.
  • This design has the advantage that the pump is held in the cover in the simplest manner in such a way that the pump inlet 3 dips relatively deep into the pot.
  • that of the fourth stage 4 could also be designed as a pot cover if the flange of the pressure port 5 offers sufficient space for it.
  • this is arranged above the cover 7 and thus above the floor in which the pot 1 is lowered and is therefore freely accessible for assembly and maintenance.
  • the cover 7 contains a fixed connection to the inlet pipe elbow 8, the connecting flange of which is also above the level of the pot cover 7 lies.
  • the outlet opening 9 of the nozzle 8 is rounded like a diffuser to reduce the flow losses. In the neighborhood of this outlet opening - but possibly also in other areas of the pot 1 - flow guiding ribs can be provided to calm the conveying medium, one of which is indicated by dash-dotted lines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Non-Positive Displacement Air Blowers (AREA)

Abstract

1. A multistage centrifugal pump with a vertical shaft and a segmental housing (2) comprising a plurality of housing sections, for feeding liquids near to their boiling point, which at its lower end (3) on the intake side is immersed in a container (1) for the inflow of the liquid, above which the pump drive and the pressure pipe connection (5) are accessible, characterized in that the housing section (6) of the second or a further pump stage has an annular flange (7) in the form of a cover of the container (1), on which the inlet connection (8) accessible above the container (1) is disposed.

Description

Die Erfindung bezieht sich auf eine mehrstufige Kreiselpumpe mit vertikaler Welle und einem mehrere Gehäuseglieder umfassenden Gliedergehäuse zur Förderung von Flüssigkeiten nahe ihrem Siedepunkt, die mit ihrem unteren, saugseitigen Ende in einen Topf für den Zulauf der Flüssigkeit eintaucht, oberhalb dessen der Pumpenantrieb und der Druckleitungsanschluß zugänglich sind (DE-A-1 703 529).The invention relates to a multi-stage centrifugal pump with a vertical shaft and a multi-member link housing for conveying liquids near their boiling point, which dips with its lower, suction-side end into a pot for the supply of liquid, above which the pump drive and the pressure line connection accessible (DE-A-1 703 529).

Bei der Förderung von Flüssigkeiten nahe ihrem Siedepunkt ist es notwendig an der Saugseite der Pumpe für eine ausreichende Zulaufhöhe und möglichst für eine Beruhigung des Fördermediums am Pumpeneintritt zu sorgen, um Kavitation und Förderstörungen zu vermeiden. Es ist bekannt, dafür eine geodätisch tiefe Anordnung der Pumpe zu wählen. Soll beispielsweise die Förderung aus einem ebenerdigen Behälter erfolgen, so ordnet man das Pumpenaggregat in einer vertieften Grube an.When pumping liquids close to their boiling point, it is necessary to ensure a sufficient inlet height on the suction side of the pump and, if possible, to calm the pumped medium at the pump inlet in order to avoid cavitation and delivery problems. It is known to choose a geodetically deep arrangement of the pump for this. If, for example, the pumping is to take place from a ground-level container, the pump unit is arranged in a recessed pit.

Bekannt ist es ferner, mehrstufige Kreisepumpen mit vertikaler Welle mit ihrem unteren, saugseitigen Ende in einen Zulauftopf eintauchen zu lassen, der im allgemeinen die Aufgabe hat, während des Pumpenstillstands einen für den Wiederanlauf ausreichenden Flüssigkeitsvorrat zu halten (DE-A-2 025 117).It is also known to have multistage circular pumps with a vertical shaft with their lower, suction-side end immersed in an inlet pot, which generally has the task of maintaining a sufficient liquid supply for restarting during pump shutdown (DE-A-2 025 117) .

Bekannt ist ferner eine Pumpe (GB-A-701 511) für die Zirkulation eines unter hohem Druck stehenden Mediums, die innerhalb eines druckfesten Gehäuses, das aus einem topfartigen die Pumpe aufnehmenden unteren und einem den Antrieb aufnehmenden oberen Teil besteht, ein sämtliche Pumpenstufen übergreifendes Pumpengehäuse aufweist, das mittels eines daran angeordneten Ringflanschs mit dem druckfesten Gehäuse verbunden ist.Also known is a pump (GB-A-701 511) for the circulation of a medium under high pressure, which encompasses all pump stages within a pressure-resistant housing, which consists of a pot-like lower part receiving the pump and an upper part receiving the drive Has pump housing which is connected to the pressure-resistant housing by means of an annular flange arranged thereon.

Der Erfindung liegt die Aufgabe zugrunde, eine Kreiselpumpe zu schaffen, die mit einfachen Mitteln unter Verwendung von Serienpumpen die Verbesserung der Zulaufbedingungen Forderung von Flüssigkeiten nahe ihrem Siedepunkt gestattet.The invention has for its object to provide a centrifugal pump that allows the improvement of the inlet conditions demand of liquids near their boiling point with simple means using series pumps.

Die erfindungsgemäße Lösung besteht darin, daß das Gehäuseglied der zweiten oder einer weiteren Pumpenstufe mit einem Ringflansch als Deckel des Topfes ausgebildet ist, an dem der oberhalb des Topfes zugängliche Eintrittsstutzen angeordnet ist.The solution according to the invention is that the housing member of the second or a further pump stage is designed with an annular flange as the lid of the pot, on which the inlet nozzle accessible above the pot is arranged.

Auf höchst einfache Weise, nämlich durch den Austausch eines der Gehäuseglieder gegen ein solches mit Ringflansch erhält man in Verbindung mit dem die Saugseite der Pumpe aufnehmenden Topf eine Anordnung mit günstigen Zuaufbedingungen wobei die Zulaufhöhe bzw. die Eintauchtiefe der Pumpensaugseite in den Topf durch geeignete Auswahl derjenigen Stufe eingestellt werden kann, für die das mit Ringflansch versehene Gehäuseglied verwendet wird. Ferner beruht die Erfindung auf dem Gedanken, den an sich zur Speicherung von Flüssigkeit zum Zwecke des Wiederanlaufs bekannten Ansaugtopf zur Vergrößerung der Zulaufhöhe und zur Beruhigung der zulaufenden Flüssigkeit zu verwenden.In a very simple way, namely by exchanging one of the housing members for one with an annular flange, in connection with the pot receiving the suction side of the pump, an arrangement with favorable inflow conditions is obtained, with the inlet height or the immersion depth of the pump suction side in the pot by suitable selection of those Level can be set for which the housing member provided with a ring flange is used. Furthermore, the invention is based on the idea of using the suction cup known per se for storing liquid for the purpose of restarting, in order to increase the inlet height and to calm the incoming liquid.

Vorzugsweise ordnet man den Ringflansch am Gehäuseglied der letzten oder vorletzten Stufe an, damit die Pumpe möglichst tief in den Topf hineinragt. Entweder kann der Eintrittsstutzen unmittelbar mit dem Deckel verbunden (beispielsweise verschweißt) sein, oder am Deckel ist eine Anbaumöglichkeit für den Eintrittsstutzen vorgesehen.The ring flange is preferably arranged on the housing member of the last or penultimate stage so that the pump protrudes as deeply as possible into the pot. Either the inlet connector can be directly connected to the lid (for example welded), or an attachment option for the inlet connector is provided on the lid.

Der Vorteil dieser Ausführung liegt darin, daß man den Topf mit dem darin enthaltenen Teil der Pumpe einfach in ein gebohrtes Erdloch absenken kann und damit die fehlende Zulaufhöhe gewinnt. Man erspart sich das Ausheben und Befestigen einer Grube für die Aufnahme des Pumpenaggregats und der zugehörigen Armaturen, weil bei der erfindungsgemäßen Anordnung die Anschlüsse, der Motor und die Armaturen oberirdisch bleiben können.The advantage of this design is that you can simply lower the pot with the part of the pump it contains into a drilled hole in the ground and thus gain the missing inlet height. There is no need to dig and fasten a pit for receiving the pump unit and the associated fittings because the connections, the motor and the fittings can remain above ground in the arrangement according to the invention.

Die Flüssigkeitsberuhigung kann erfindungsgemäß noch weiter verbessert werden, indem im Topf Strömungsleitrippen angeordnet werden, die vorzugsweise vom Topfdeckel weg verlaufen. Besonders zweckmäßig ist die Anordnung von Strömungsleitrippen dann, wenn die Pumpe nicht zentrisch im Topf angeordnet ist. Ferner ist es zur Ausnutzung der vorhandenen Druckhöhe zweckmäßig, die Mündung des Eintrittstutzens in den Topf diffusorartig oder aber zumindest gut gerundet auszubilden.The liquid calming can be improved even further according to the invention by arranging flow guide ribs in the pot, which preferably run away from the pot lid. The arrangement of flow guide ribs is particularly expedient when the pump is not arranged centrally in the pot. Furthermore, in order to utilize the available pressure head, it is expedient to design the mouth of the inlet connection into the pot in a diffuser-like manner or at least well rounded.

Nach einem weiteren Merkmal der Erfindung soll der Abstand zwischen dem Pumpeneinlauf und der dem Pumpeneinlauf gegenüberliegenden Wand des Topfs mindestens dem Durchmesser des Pumpeneinlaufs gleichen.According to a further feature of the invention, the distance between the pump inlet and the wall of the pot opposite the pump inlet should be at least equal to the diameter of the pump inlet.

Die Erfindung wird im folgenden näher unter Bezugnahme auf die Zeichnung erläutert, die ein vorteilhaftes Ausführungsbeispiel in einer teilweise geschnittenen Seitenansicht darstellt.The invention is explained in more detail below with reference to the drawing, which shows an advantageous embodiment in a partially sectioned side view.

Der Topf 1, den man sich als Rotationskörper mit vertikaler Achse vorstellen kann, hat eine obere Öffnung, die von einem Deckel 7 verschlossen ist. Dieser Deckel trägt die Pumpe 2 mit vertikaler Achse, indem er als Gehäuseglied 6 der dritten Stufe von insgesamt vier Pumpenstufen ausgebildet ist. Diese Ausführung hat den Vorteil, daß die Pumpe auf einfachste Weise derart in dem Deckel gehalten ist, daß der Pumpeneinlauf 3 verhältnismäßig tief in den Topf eintaucht. Statt dem Gehäuseglied der dritten Stufe könnte auch das der vierten Stufe 4 als Topfdeckel ausgebildet sein, wenn der Flansch des Druckstutzens 5 ausreichenden Platz dafür bietet. Dieser ist ebenso wie der Motor und die Motorkupplung oberhalb des Deckels 7 und damit oberhalb des Bodens, in welchen der Topf 1 abgesenkt ist, angeordnet und damit zur Montage und Wartung frei zugänglich.The pot 1, which can be thought of as a rotating body with a vertical axis, has an upper opening which is closed by a lid 7. This cover carries the pump 2 with a vertical axis by being designed as a housing member 6 of the third stage of a total of four pump stages. This design has the advantage that the pump is held in the cover in the simplest manner in such a way that the pump inlet 3 dips relatively deep into the pot. Instead of the housing member of the third stage, that of the fourth stage 4 could also be designed as a pot cover if the flange of the pressure port 5 offers sufficient space for it. Like the motor and the motor coupling, this is arranged above the cover 7 and thus above the floor in which the pot 1 is lowered and is therefore freely accessible for assembly and maintenance.

Der Deckel 7 enthält fest verbunden den Eintrittsrohrkrümmer 8, dessen Anschlußflansch ebenfalls oberhalb der Ebene des Topfdeckels 7 liegt. Die Austrittsöffnung 9 des Stutzens 8 ist diffusorartig ausgerundet zur Verringerung der Strömungsverluste. In der Nachbarschaft diese Austrittöffnung - ggf. aber auch in weiteren Bereichen des Topfes 1 können zur Beruhigung des Fördermediums Strömungsleitrippen vorgesehen sein, von denen eine strichpunktiert angedeutet ist.The cover 7 contains a fixed connection to the inlet pipe elbow 8, the connecting flange of which is also above the level of the pot cover 7 lies. The outlet opening 9 of the nozzle 8 is rounded like a diffuser to reduce the flow losses. In the neighborhood of this outlet opening - but possibly also in other areas of the pot 1 - flow guiding ribs can be provided to calm the conveying medium, one of which is indicated by dash-dotted lines.

Claims (5)

1. A multistage centrifugal pump with a vertical shaft and a segmental housing (2) ccmprising a plurality of housing sections, for feeding liquids near to their boiling point, which at its lower end (3) on the intake side is immersed in a container (1) for the inflow of the liquid, above which the pump drive and the prressure pipe connection (5) are accessible, characterised in that the housing section (6) of the second or a further pump stage has an annular flange (7) in the form of a cover of the container (1), on which the inlet connection (8) accessible above the container (1) is disposed.
2. A centrifugal pump according to Claim 1, characterised in that the annular flange (7) is provided on the housing section (4, 6) of the last or penultimate stage.
3. A centrifugal pump according to either Claim 1 or Claim 2, characterised in that the container comprises flowdirecting ribs.
4. A centrifugal pump according to one of claims 1 to 3, characterised in that the inlet (9) into the container (1) is rounded in the form of a diffuser.
5. A centrifugal pump according to one of Claims 1 to 4, characterised in that the distance present between the pump intake (3) and the opposing wall (10) of the container (1) is at least equal to the diameter of the pump intake.
EP82107260A 1981-09-11 1982-08-11 Multistage centrifugal pump Expired EP0075100B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82107260T ATE12814T1 (en) 1981-09-11 1982-08-11 MULTISTAGE CENTRIFUGAL PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3136116 1981-09-11
DE19813136116 DE3136116A1 (en) 1981-09-11 1981-09-11 MULTI-STAGE CENTRIFUGAL PUMP

Publications (3)

Publication Number Publication Date
EP0075100A1 EP0075100A1 (en) 1983-03-30
EP0075100B1 EP0075100B1 (en) 1985-04-17
EP0075100B2 true EP0075100B2 (en) 1988-10-12

Family

ID=6141422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107260A Expired EP0075100B2 (en) 1981-09-11 1982-08-11 Multistage centrifugal pump

Country Status (9)

Country Link
EP (1) EP0075100B2 (en)
AT (1) ATE12814T1 (en)
AU (1) AU8750182A (en)
DE (2) DE3136116A1 (en)
DK (1) DK405282A (en)
ES (1) ES276130Y (en)
NO (1) NO822996L (en)
NZ (1) NZ201627A (en)
ZA (1) ZA825936B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481889B (en) * 2014-12-22 2017-01-04 邓伟 One i.e. drives energy-saving vertical self priming pump

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE725506C (en) * 1940-01-12 1942-09-23 Wilhelm Beck Dipl Ing Self-priming centrifugal pump
US2514865A (en) * 1945-04-13 1950-07-11 Ingersoll Rand Co Pumping unit
GB701511A (en) * 1949-11-01 1953-12-30 Hayward Tyler & Co Ltd Improvements in and relating to pump and motor combinations
FR2044994A5 (en) * 1969-05-29 1971-02-26 Guinard Pompes

Also Published As

Publication number Publication date
ES276130U (en) 1984-05-01
EP0075100A1 (en) 1983-03-30
NO822996L (en) 1983-03-14
ZA825936B (en) 1983-07-27
ES276130Y (en) 1984-12-16
EP0075100B1 (en) 1985-04-17
DE3263132D1 (en) 1985-05-23
ATE12814T1 (en) 1985-05-15
DE3136116A1 (en) 1983-03-31
NZ201627A (en) 1985-04-30
AU8750182A (en) 1983-03-17
DK405282A (en) 1983-03-12

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