EP3608544B1 - Pompe centrifuge - Google Patents

Pompe centrifuge Download PDF

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Publication number
EP3608544B1
EP3608544B1 EP18405018.5A EP18405018A EP3608544B1 EP 3608544 B1 EP3608544 B1 EP 3608544B1 EP 18405018 A EP18405018 A EP 18405018A EP 3608544 B1 EP3608544 B1 EP 3608544B1
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EP
European Patent Office
Prior art keywords
centrifugal pump
annular space
impeller
pump according
housing
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.)
Active
Application number
EP18405018.5A
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German (de)
English (en)
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EP3608544A1 (fr
Inventor
Ernst Müller
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage 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
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more 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
    • 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
    • F04D5/007—Details of the inlet or outlet
    • 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
    • F04D5/008—Details of the stator, e.g. channel shape

Definitions

  • the invention relates to a centrifugal pump for pumping liquids.
  • Peripheral impeller centrifugal pumps have been known for a long time. With a peripheral impeller centrifugal pump, a high pressure at the outlet and thus a high delivery head can be achieved at a low delivery rate. However, the characteristic curves fall off steeply, i.e. a significant increase in the delivery rate is only possible with a sharp reduction in the outlet pressure, i.e. the achievable delivery head. The required pumping power also drops steeply.
  • the characteristic curves of radial impeller centrifugal pumps which have also been known for a long time, are rather flat, i.e. a significant increase in the delivery rate can be achieved by slightly reducing the outlet pressure, corresponding to the achievable delivery head, while the required pump capacity increases slightly. However, the maximum outlet pressure that can be achieved is rather low.
  • the invention is based on the object of specifying a centrifugal pump with which output pressures that are similarly high can be achieved as with a comparable peripheral impeller centrifugal pump, but whose characteristic curves are significantly flatter.
  • the centrifugal pump according to the invention essentially corresponds to a peripheral impeller centrifugal pump which has an addition on the inlet side which has the characteristics of a radial impeller centrifugal pump. It has a very simple and space-saving design and can be produced correspondingly inexpensively.
  • the characteristic curves are qualitatively similar to those of a peripheral impeller centrifugal pump, but fall off much less steeply.
  • the required pump power slowly decreases with an increasing delivery rate. A high level of efficiency can be achieved.
  • the centrifugal pump according to the invention has ( 1 ) has a housing which is composed of a front suction housing 1 and a rear pressure housing 2 connected to the same by screws with spring washers 3, between which a circumferential seal 4 is arranged.
  • the suction housing 1 and the pressure housing 2 are each designed to be approximately rotationally symmetrical and enclose a substantially rotationally symmetrical cavity with an outer annular space, the outer boundary of which is formed by peripheral parts of the suction housing 1 and the pressure housing 2 and which consists of a front annular space 5 and a rear annular space 6 exists.
  • the front annular space 5 is connected to an inlet nozzle 7 which is mounted centrally on the suction housing 1 and opens into the cavity at the front.
  • the pressure housing 2 carries a peripherally arranged outlet nozzle 8, which leads out approximately tangentially upwards from the rear annular space 6 and whose clear cross-section corresponds approximately to that of the inlet nozzle 7.
  • An impeller 11 (see also 2 , where the suction housing 1 is omitted and Fig. 4a-c ) fixed in the cavity in one running direction (see arrow in 2 ) is rotatable about a central axis 12.
  • the impeller 11 has a disc-shaped base, which carries vertically protruding webs 13 on a front side facing the inlet connection 7, which extend from the inside, i.e. bent back from near the axis in the direction of travel, towards the outer edge of the base, but with an edge region of the front remains free.
  • the impeller 11 has radial ribs 15 of the same height running radially from the inside, ie from an annular rib 14 surrounding the axis 12 to the outer edge of the base the rear annular space 6 adjoining space 16 remains free.
  • the webs can also protrude beyond the outer edge of the base.
  • the distance between the annular rib 14 and a rear wall of the pressure housing 2 is bridged by a fixed annular rib 17 projecting from the latter towards the annular rib 14 such that there is only a narrow circumferential gap between the annular ribs 14 and 17 .
  • the intermediate wall 18 has a recess 19 'which has the shape of a Has an annular sector, which extends from the inner edge of the intermediate wall 18 to close to its outer edge and occupies an angular range of about 45 ° and a circular ring sector-shaped passage 19 forms.
  • the area of the passage 19 corresponds approximately to the clear cross section of the outlet nozzle 8, any deviations preferably amount to at most 20%.
  • the passage 19 is preceded by a barrier 20 (see Fig. 3 , where the suction housing 1, the impeller 11, the intermediate wall 18 and the shaft 10 are omitted) immediately in front, which in turn follows closely the opening in the rear annular space 6, which leads into the outlet nozzle 8.
  • the lock 20 is designed as an approximately radial bolt projecting from the rear wall of the pressure housing 2, extending through the intermediate space 16 and the rear annular space 6 and interrupting them, which reaches close to the webs 15 of the impeller 11 and abuts the intermediate wall 18. Its front side is slightly inclined outwards in the direction of travel, so that it constantly leads to the outlet nozzle 8 .
  • the shaft 10 is driven and the impeller 11 rotates in the z 2 specified running direction.
  • the liquid to be transported is sucked in through the inlet nozzle 7 (arrow x in 1 , 2 ), taken along by the webs 13 on the front side of the impeller 11 and pressed into the front annular space 5 by the centrifugal force.
  • the liquid then reaches the rear annular space 6, where it is pressed inwards and partly between the webs 15 on the back of the impeller 11 and into the space 16. It is therefore partly entrained directly by the webs 15 and partly due to its viscosity Gap 16 and entrained in the rear annular space 6 by the movement of the entrained by the webs 15 liquid.
  • the effect of the centrifugal pump according to the invention is similar to that of a radial impeller centrifugal pump and a peripheral impeller centrifugal pump connected in series, but the construction is much simpler.
  • the characteristics ( 6 ) lie somewhere between the characteristic curves of these two known types of centrifugal pumps.
  • the output pressure that can be achieved and thus the maximum delivery head H is high, similar to that of a peripheral impeller centrifugal pump.
  • the outlet pressure, ie the delivery head H decreases less rapidly with increasing delivery rate Q.
  • the power requirement P does not depend very much on the delivery rate Q either.
  • the characteristics are similar to those of a radial impeller centrifugal pump.

Landscapes

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

Claims (11)

  1. Pompe centrifuge pour le transfert des liquides, avec un boîtier entourant une cavité qui est au moins approximativement symétrique en rotation, avec un espace annulaire ainsi qu'un manchon d'entrée (7), s'ouvrant dans la cavité sur un côté frontale et relié à l'espace annulaire, et un manchon de sortie (8) périphérique s'étendant de l'espace annulaire vers l'extérieur, et avec une roue (11) tournable dans un sens de marche autour d'un axe (12) dans la cavité et présentant des âmes (15) sur une face arrière qui s'étendent radialement depuis l'intérieur vers un bord extérieur, et dans lequel le manchon d'entrée (7) est arrangé de manière centrale, et la roue (11) présente un bord extérieur qui est espacé de la délimitation de l'espace annulaire, et des âmes (13) faisant saillie sur une face avant faisant face au manchon d'entrée (7) et qui s'étendent, recourbée contre le sens de marche, depuis la proximité de l'axe (12) contre le bord extérieur, et l'espace annulaire est divisé, par la roue (11) et une paroi intermédiaire (18) périphérique s'étendant depuis sa délimitation extérieure au moins jusqu'au bord extérieur de la roue (11), dans un espace annulaire frontale (5) s'étendant sur toute la périphérie et relié au manchon d'entrée (7), et un espace annulaire arrière (6) s'étendant approximativement sur toute la périphérie et relié au manchon de sortie (8), et étant interrompu par une barrière (20) au moins approximativement radiale qui s'approche à la roue (11) et suit le manchon de sortie (8) dans le sens de marche, alors que la paroi intermédiaire (18) présente un passage (19) qui suit la barrière (20) dans le sens de marche et s'étend sur un intervalle angulaire limité.
  2. Pompe centrifuge selon la revendication 1, caractérisée en ce que la face avant de la roue (11) est exempte des âmes (13) dans une région de bord extérieur et chevauche la paroi intermédiaire (18) dans cette région.
  3. Pompe centrifuge selon la revendication 1 ou 2, caractérisée en ce que le passage (19) est immédiatement adjacent à la barrière (20).
  4. Pompe centrifuge selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le passage (19) occupe une surface qui diffère d'au plus 20% de la section transversale libre du manchon de sortie (8).
  5. Pompe centrifuge selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le passage (19) présente la forme d'un secteur d'anneau de cercle.
  6. Pompe centrifuge selon l'une quelconque des revendications 1 à 5, caractérisée en ce qu'un espace intermédiaire (16) suivant l'espace annulaire arrière (6) à l'intérieur est prévu adjacent à la face arrière de la roue (11), est en ce que la barrière (20) s'étend à travers l'espace intermédiaire (16) aussi.
  7. Pompe centrifuge selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le manchon de sortie (8) sort tangentiellement de l'espace annulaire arrière (6).
  8. Pompe centrifuge selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le côté frontal du boîtier est constitué par un boîtier d'aspiration (1) qui entoure l'espace annulaire arrière (5) et comprend le manchon d'entrée (7), et un côté arrière du boîtier est constitué par un boîtier de refoulement (2) qui entoure l'espace annulaire arrière (6) et comprend le manchon de sortie (8).
  9. Pompe centrifuge selon la revendication 8, caractérisée en ce qu'un bord extérieur de la paroi intermédiaire (18) est serré entre le boîtier d'aspiration (1) et le boîtier de refoulement (2).
  10. Pompe centrifuge selon la revendication 8 ou 9, caractérisée en ce que la barrière (20) est configurée sous forme d'un loquet formé sur une paroi arrière du boîtier de refoulement (2).
  11. Pompe centrifuge selon l'une quelconque des revendications 8 à 10, caractérisée en ce que la roue (11) est fixée sur un arbre (10) guidé par une garniture étanche à anneau glissant (9) et entraînable dans le sens de marche.
EP18405018.5A 2018-08-09 2018-08-09 Pompe centrifuge Active EP3608544B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18405018.5A EP3608544B1 (fr) 2018-08-09 2018-08-09 Pompe centrifuge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18405018.5A EP3608544B1 (fr) 2018-08-09 2018-08-09 Pompe centrifuge

Publications (2)

Publication Number Publication Date
EP3608544A1 EP3608544A1 (fr) 2020-02-12
EP3608544B1 true EP3608544B1 (fr) 2022-01-12

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ID=63311968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18405018.5A Active EP3608544B1 (fr) 2018-08-09 2018-08-09 Pompe centrifuge

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EP (1) EP3608544B1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936240A (en) * 1974-03-25 1976-02-03 General Electric Company Centrifugal-vortex pump
JPS529107A (en) * 1975-07-11 1977-01-24 Matsushita Electric Ind Co Ltd Pump
DE4315448A1 (de) * 1992-05-19 1993-12-23 Lederle Pumpen & Maschf Peripheralrad-Pumpe

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Publication number Publication date
EP3608544A1 (fr) 2020-02-12

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