EP0286954B1 - Self-priming centrifugal pump - Google Patents

Self-priming centrifugal pump Download PDF

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Publication number
EP0286954B1
EP0286954B1 EP88105434A EP88105434A EP0286954B1 EP 0286954 B1 EP0286954 B1 EP 0286954B1 EP 88105434 A EP88105434 A EP 88105434A EP 88105434 A EP88105434 A EP 88105434A EP 0286954 B1 EP0286954 B1 EP 0286954B1
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EP
European Patent Office
Prior art keywords
rib
centrifugal pump
self
impeller
priming centrifugal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88105434A
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German (de)
French (fr)
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EP0286954A2 (en
EP0286954A3 (en
Inventor
Ernst Korthaus
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to AT88105434T priority Critical patent/ATE83297T1/en
Publication of EP0286954A2 publication Critical patent/EP0286954A2/en
Publication of EP0286954A3 publication Critical patent/EP0286954A3/en
Application granted granted Critical
Publication of EP0286954B1 publication Critical patent/EP0286954B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D9/004—Priming of not self-priming pumps
    • F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
    • 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 self-priming centrifugal pump with impeller cell flushing, according to the preamble of claim 1.
  • the centrifugal pump is particularly suitable for pumping dirty water.
  • self-priming centrifugal pumps it is necessary to aspirate the gas cushion contained in the suction line as quickly as possible and to expel it via the pressure line.
  • a self-priming centrifugal pump with a conventionally designed impeller is known from US Pat. No. 2,792,787.
  • the diffuser with its blades directed in the same direction has a new type of special training.
  • the two primary vanes of normal length are arranged opposite each other.
  • the two secondary, elongated guide vanes are assigned two opposing auxiliary guide vanes, following in the direction of rotation of the impeller, which are also greatly elongated and are curved in the same way in the rear 2/3 part.
  • the front end pieces i.e.
  • this auxiliary guide vanes bent outwards, so that these blade parts run at a substantial distance from the periphery of the impeller chamber.
  • the resulting channels to the impeller periphery should serve as suction channels, induction channels, for the water-air mixture. These suction channels cannot generate an induction pulse.
  • the special training and special assignment of the secondary and auxiliary guide vanes only result in a low air intake capacity.
  • the object of the invention is to design a self-priming centrifugal pump of the type mentioned in such a way that the drag effect of the process water on the existing and to be extracted gas volume is increased.
  • the impeller 4 is surrounded by a rotationally symmetrical open guide ring 5 which is formed from two rotating surfaces 7, 7a.
  • the impeller blades 6 are curved backwards in the present example.
  • the guide ring 5 has two pairs of guide ribs 8, 9, one above and one below the impeller axis.
  • the pair of guide ribs 8, 9 consists of the induction rib 8 and the catch rib 9, which are welded onto the rotating surface 7 in the example shown.
  • the induction rib 8 and the catch rib 9 are of different lengths, straight, with their starting points on the line of a secant of the rotating surfaces 7, 7a and at the same distance a from the impeller axis.
  • their starting points are arranged in the form of an isosceles triangle. The starting points of induction rib 8 and catch rib 9 are brought up close to the passing impeller blades.
  • the effect of the induction rib 8 is based on the fact that, due to its special angular adjustment to the passing impeller blade, the operating water rotating in the guide ring is partially returned to the impeller. This allows the water-air mixture in the impeller to suck in more air from the suction nozzle and thus lead to the ventilation of the suction line.
  • the effect of the rib 9 is based on the fact that a part of the water-air mixture thrown back into the guide ring is separated into water and air, the air escapes upwards and the water is brought back into the impeller by the following rib. The separated air is discharged through the pressure port and liquid is quickly conveyed.
  • the impeller 4 which is open on one side, is sealed on the suction side by the rotating surface 7.
  • the surface of rotation 7 can be equipped with an exchangeable wear plate 10 in the central area.
  • the second rotational surface 7a of the guide ring 5 is formed by the housing wall on the drive side.

Abstract

The invention is directed to a selfpriming centrifugal pump having a symmetrical annular guide channel with a centrally mounted cover disc. A pair of guide ribs improve the loading of the impeller and increase the capacity for drawing air by suction. The guide rib pair is mounted in the annular guide channel. Each guide rib includes an injection rib and a separation rib. The ribs preferably have a width corresponding to the width of the annular guide channel and are arranged on a secant drawn through the circular peripheral band defined by the outer tips of the vanes of the impeller as the latter rotates.

Description

Die Erfindung betrifft eine selbstansaugende Kreiselpumpe mit Laufradzellenspülung, gemäß dem Oberbegriff des Patentanspruchs 1. Die Kreiselpumpe eignet sich besonders zur Förderung von Schmutzwasser. Für selbstansaugende Kreiselpumpen ist es erforderlich, das in der Saugleitung enthaltene Gaspolster möglichst schnell abzusaugen und über die Druckleitung auszustoßen.The invention relates to a self-priming centrifugal pump with impeller cell flushing, according to the preamble of claim 1. The centrifugal pump is particularly suitable for pumping dirty water. For self-priming centrifugal pumps, it is necessary to aspirate the gas cushion contained in the suction line as quickly as possible and to expel it via the pressure line.

Aus der US-PS 2 792 787 ist eine selbstsaugende Kreiselpumpe bekannt mit einem konventionell ausgebildeten Laufrad. Der Leitapparat mit seinen in gleicher Richtung gerichteten Schaufeln weist eine neuartige Sonderausbildung auf. Die zwei primären Leitschaufeln von normaler Länge sind gegenüberliegend angeordnet. In Rotationsrichtung des Laufrades folgen zwei sich gegenüberliegende, sekundäre Leitschaufeln von fast 3-facher Länge der primären Leitschaufeln. Den beiden sekundären, verlängerten Leitschaufeln sind, in Rotationsrichtung des Laufrades folgend, zwei sich gegenüberliegende Hilfsleitschaufeln zugeordnet, die ebenfalls stark verlängert und im hinteren 2/3-Teil in gleicher Weise gekrümt sind. Als Besonderheit sind die vorderen Endstücke, d.h. die vorderen Drittel, dieser Hilfsleitschaufeln auswärts gebogen, sodaß diese Schaufelteile mit wesentlichem Abstand zur Peripherie der Laufradkammer verlaufen. Die sich so ergebenden Kanäle zur Laufradperipherie sollen als Saugkanäle, Einspülkanal, für das Wasser-Luft-Gemisch dienen. Einen Einspülimpuls können diese Saugkanäle nicht erzeugen. Die Sonderausbildung und Sonderzuordnung der sekundären und der Hilfsleitschaufeln bewirken lediglich eine geringe Luft-Ansaugleistung.A self-priming centrifugal pump with a conventionally designed impeller is known from US Pat. No. 2,792,787. The diffuser with its blades directed in the same direction has a new type of special training. The two primary vanes of normal length are arranged opposite each other. In the direction of rotation of the impeller, two opposing secondary guide vanes of almost 3 times the length of the primary guide vanes follow. The two secondary, elongated guide vanes are assigned two opposing auxiliary guide vanes, following in the direction of rotation of the impeller, which are also greatly elongated and are curved in the same way in the rear 2/3 part. As a special feature, the front end pieces, i.e. the front third, this auxiliary guide vanes bent outwards, so that these blade parts run at a substantial distance from the periphery of the impeller chamber. The resulting channels to the impeller periphery should serve as suction channels, induction channels, for the water-air mixture. These suction channels cannot generate an induction pulse. The special training and special assignment of the secondary and auxiliary guide vanes only result in a low air intake capacity.

Aufgabe der Erfindung ist es, eine selbstsaugende Kreiselpumpe der genannten Gattung solcherart auszubilden, daß die Schleppwirkung des Betriebswassers auf das vorhandene und herauszufördernde Gasvolumen erhöht wird.The object of the invention is to design a self-priming centrifugal pump of the type mentioned in such a way that the drag effect of the process water on the existing and to be extracted gas volume is increased.

Diese Aufgabe wird gemäß der Erfindung gelöst durch die im kennzeichnenden Teil des Anspruchs 1 herausgestellten Merkmals. Zweckmäßige Ausgestaltungen sind Gegenstand der Unteransprüche.
Ein Ausführungsbeispiel ist in den Zeichnungen dargestellt.This object is achieved according to the invention by the feature highlighted in the characterizing part of claim 1. Appropriate configurations are the subject of the subclaims.
An embodiment is shown in the drawings.

Es zeigen:

Fig. 1 -
den Querschnitt einer selbstsaugenden Kreiselpumpe in der Laufradmittelebene
Fig. 2 -
den Längsschnitt durch Laufradwelle, Laufrad, Ansaugstutzen und Pumpengehäuse
Show it:
Fig. 1 -
the cross section of a self-priming centrifugal pump in the impeller center plane
Fig. 2 -
the longitudinal section through the impeller shaft, impeller, intake manifold and pump housing

Nach Fig. 1 wird im Pumpengehäuse 1 der Saugstutzen 2 und der Druckstutzen 3 oberhalb der Achse des Laufrades 4 eingeführt. So ist bekannterweise sichergestellt, daß das Pumpengehäuse 1 bei Pumpenstillstand nicht leerläuft. Das Laufrad 4 ist umgeben von einem rotationssymetrischen offenen Leitring 5 der aus zwei Rotationsflächen 7, 7a gebildet wird. Die Laufradschaufeln 6 sind im vorliegenden Beispiel rückwärts gekrümt. Der Leitring 5 weist 2 Leitrippenpaare 8, 9, eines oberhalb und eines unterhalb der Laufradachse, auf. Das Leitrippenpaar 8, 9 besteht aus der Einspülrippe 8 und der Fangrippe 9, die im dargestellten Beispiel auf der Rotationsfläche 7 angeschweißt sind. Einspülrippe 8 und Fangrippe 9 sind von unterschiedlicher Länge, gerade, ihre Anfangspunkte auf der Linie einer Sekante der Rotationsflächen 7, 7a und mit gleichem Abstand a von der Laufradachse angeordnet. Beim Einsatz von drei Leitrippenpaaren 8, 9 sind ihre Anfangspunkte in Form eines gleichschenkligen Dreiecks angeordnet. Die Anfangspunkte von Einspülrippe 8 und Fangrippe 9 sind bis dicht an die vorbeistreichenden Laufradschaufeln herangeführt.1, the suction port 2 and the pressure port 3 are inserted above the axis of the impeller 4 in the pump housing 1. It is known to ensure that the pump housing 1 does not run empty when the pump is at a standstill. The impeller 4 is surrounded by a rotationally symmetrical open guide ring 5 which is formed from two rotating surfaces 7, 7a. The impeller blades 6 are curved backwards in the present example. The guide ring 5 has two pairs of guide ribs 8, 9, one above and one below the impeller axis. The pair of guide ribs 8, 9 consists of the induction rib 8 and the catch rib 9, which are welded onto the rotating surface 7 in the example shown. The induction rib 8 and the catch rib 9 are of different lengths, straight, with their starting points on the line of a secant of the rotating surfaces 7, 7a and at the same distance a from the impeller axis. When using three pairs of guide ribs 8, 9, their starting points are arranged in the form of an isosceles triangle. The starting points of induction rib 8 and catch rib 9 are brought up close to the passing impeller blades.

Die Wirkung der Einspülrippe 8 beruht darauf, daß sie durch ihre besondere Winkeleinstellung zur vorbeistreichenden Laufradschaufel das im Leitring rotierende Betriebswasser teilweise wieder in das Laufrad zurückgeführt. Dadurch kann das Wasser-Luftgemisch im Laufrad mehr Luft aus dem Saugstutzen ansaugen und so zur Entlüftung der Saugleitung führen.
Die Wirkung der Fangrippe 9 beruht darauf, daß ein Teil des in den Leitring zurückgeschleuderten Wasser-Luftgemisches in Wasser und Luft getrennt wird, die Luft nach oben entweicht und das Wasser durch die folgende Fangrippe wieder in das Laufrad zurückgeholt wird. Die abgetrennte Luft wird über den Druckstutzen abgeleitet und es kommt schnell zur Förderung von Flüssigkeit.The effect of the induction rib 8 is based on the fact that, due to its special angular adjustment to the passing impeller blade, the operating water rotating in the guide ring is partially returned to the impeller. This allows the water-air mixture in the impeller to suck in more air from the suction nozzle and thus lead to the ventilation of the suction line.
The effect of the rib 9 is based on the fact that a part of the water-air mixture thrown back into the guide ring is separated into water and air, the air escapes upwards and the water is brought back into the impeller by the following rib. The separated air is discharged through the pressure port and liquid is quickly conveyed.

Durch die Art der Wasserführung ergibt sich ein starker Einspülimpuls in das Laufrad, der eine kräftige Gasabsaugung zur Folge hat.The type of water flow results in a strong flushing impulse into the impeller, which results in vigorous gas extraction.

Aus Fig. 2 sind mehr detaillierte Konstruktionsmerkmale der Kreiselpumpe zu erkennen. Das einseitig offene Laufrad 4 wird saugseitig von der Rotationsfläche 7 abgedichtet. Die Rotationsfläche 7 kann im zentralen Bereich mit einer auswechselbaren Schleißscheibe 10 ausgerüstet sein. Im dargestellten Beispiel wird die zweite Rotationsfläche 7a des Leitrings 5 durch die antriebsseitige Gehäusewand gebildet.2 shows more detailed design features of the centrifugal pump. The impeller 4, which is open on one side, is sealed on the suction side by the rotating surface 7. The surface of rotation 7 can be equipped with an exchangeable wear plate 10 in the central area. In the example shown, the second rotational surface 7a of the guide ring 5 is formed by the housing wall on the drive side.

Claims (6)

  1. Self-priming centrifugal pump with impeller-cell flushing system, equipped with impeller (4) and downstream annular guide channel (5) which is dynamically balanced and consists of lateral rotary sections (7,7a), and with intake nozzle (2) in the centre,
    characterized in that it has at least one guide rib pair (8,9) in guide channel (5), said pair consisting of one injection rib (8) and one separation rib (9) and being of guide channel width, the outer tips of rib pair (8,9) near the impeller circumference being arranged on a secant of rotary section (7,7a).
  2. Self-priming centrifugal pump according to claim 1,
    characterized in that separation rib (9) and injection rib (8) are arranged on a secant drawn through the circular peripheral band.
  3. Self-priming centrifugal pump according to claim 1,
    characterized in that separation rib (9) and injection rib (8) are of different length.
  4. Self-priming centrifugal pump according to claims 1 and 2,
    characterized in that several pairs of guide ribs (8/9) are spaced in regular intervals.
  5. Self-priming centrifugal pump according to claims 1 to 3,
    characterized in that the injection rib (8) and separation rib (9) are curved.
  6. Self-priming centrifugal pump according to claims 1 to 4,
    characterized in that separation ribs (9) and injection ribs (8) are attached to cover disk (7).
EP88105434A 1987-04-16 1988-04-06 Self-priming centrifugal pump Expired - Lifetime EP0286954B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88105434T ATE83297T1 (en) 1987-04-16 1988-04-06 SELF-PRIMING CENTRIFUGAL PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873712916 DE3712916A1 (en) 1987-04-16 1987-04-16 SELF-SUCTIONING CENTRIFUGAL PUMP
DE3712916 1987-04-16

Publications (3)

Publication Number Publication Date
EP0286954A2 EP0286954A2 (en) 1988-10-19
EP0286954A3 EP0286954A3 (en) 1989-01-11
EP0286954B1 true EP0286954B1 (en) 1992-12-09

Family

ID=6325756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105434A Expired - Lifetime EP0286954B1 (en) 1987-04-16 1988-04-06 Self-priming centrifugal pump

Country Status (7)

Country Link
US (1) US4844687A (en)
EP (1) EP0286954B1 (en)
JP (1) JPS63277886A (en)
AT (1) ATE83297T1 (en)
DE (2) DE3712916A1 (en)
ES (1) ES2037123T3 (en)
IN (1) IN171114B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102913484A (en) * 2012-10-31 2013-02-06 遵义海立水泵制造有限责任公司 Pump top volute casing

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2533191Y2 (en) * 1991-03-22 1997-04-23 新明和工業株式会社 Pump device
DE4309479A1 (en) * 1993-03-24 1994-09-29 Wilo Gmbh Radial centrifugal pump
DE9317443U1 (en) * 1993-11-15 1994-01-13 Duewag Ag Water supply system, in particular for catering coaches on passenger trains
US6471476B1 (en) 2000-11-13 2002-10-29 Wacker Corporation Centrifugal trash pump
US7197885B2 (en) * 2004-09-30 2007-04-03 Valeo Climate Control Corp Water separator with ribs
JP4861289B2 (en) * 2004-10-27 2012-01-25 パナソニック株式会社 Fan unit for air conditioner
EP1873399B1 (en) * 2006-06-29 2012-12-05 Grundfos Management A/S Centrifugal pump unit
CN103133353B (en) * 2013-03-12 2015-05-06 孙九江 Self-suction centrifugal pump

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DE673662C (en) * 1937-02-27 1939-03-25 Fedor Werner Self-priming centrifugal pump
US2247817A (en) * 1938-04-30 1941-07-01 Gen Electric Centrifugal pump
US2461925A (en) * 1946-09-05 1949-02-15 Gorman Rupp Co Self-priming centrifugal pump
DE959969C (en) * 1951-05-16 1957-03-14 Georg Volland Dr Ing Self-priming centrifugal pump
US2792787A (en) * 1953-03-03 1957-05-21 Mcculloch Motors Corp Pumping device
US2945448A (en) * 1957-02-15 1960-07-19 Bell & Gossett Co Universal centrifugal pump
GB856886A (en) * 1957-07-30 1960-12-21 Bell & Gossett Co Centrifugal pump
GB974971A (en) * 1959-12-03 1964-11-11 J H Carruthers & Company Ltd A rotary gas pump
US3103177A (en) * 1961-07-20 1963-09-10 Bell & Gossett Co Self-priming centrifugal pump
US3506374A (en) * 1968-06-04 1970-04-14 Decatur Pump Co Self-priming pump
US3873231A (en) * 1972-08-11 1975-03-25 Allis Chalmers Centrifugal pump diffuser
DE7534163U (en) * 1975-10-28 1976-03-11 Grabbe, Friedbert, Ing.(Grad.), 4300 Essen CENTRIFUGAL PUMP FOR PUMPING LIQUIDS MIXED WITH GASES
FR2405083A1 (en) * 1977-10-04 1979-05-04 Ideal Standard Separation of air from liquid before a centrifugal pump - a chamber being attached to the pump to collect the air
YU41671B (en) * 1979-10-22 1987-12-31 Tozd Tovarna Motorjev Tomos Self suction centrifugal pump
SU987189A1 (en) * 1981-05-19 1983-01-07 Предприятие П/Я В-8319 Vane pump
DE3539883A1 (en) * 1985-09-18 1987-03-26 Hermetic Pumpen Gmbh Self-priming centrifugal pump
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102913484A (en) * 2012-10-31 2013-02-06 遵义海立水泵制造有限责任公司 Pump top volute casing

Also Published As

Publication number Publication date
DE3712916C2 (en) 1989-11-30
IN171114B (en) 1992-07-25
DE3712916A1 (en) 1988-11-03
EP0286954A2 (en) 1988-10-19
JPS63277886A (en) 1988-11-15
US4844687A (en) 1989-07-04
ES2037123T3 (en) 1993-06-16
EP0286954A3 (en) 1989-01-11
ATE83297T1 (en) 1992-12-15
DE3876476D1 (en) 1993-01-21

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