EP0456596B1 - Pompe centrifuge - Google Patents

Pompe centrifuge Download PDF

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Publication number
EP0456596B1
EP0456596B1 EP19910610041 EP91610041A EP0456596B1 EP 0456596 B1 EP0456596 B1 EP 0456596B1 EP 19910610041 EP19910610041 EP 19910610041 EP 91610041 A EP91610041 A EP 91610041A EP 0456596 B1 EP0456596 B1 EP 0456596B1
Authority
EP
European Patent Office
Prior art keywords
web
segments
centrifugal pump
section
cover plate
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
EP19910610041
Other languages
German (de)
English (en)
Other versions
EP0456596A1 (fr
Inventor
Niels Due Jensen
Gunnar Langgaard
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.)
Grundfos AS
Original Assignee
Grundfos International AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Grundfos International AS filed Critical Grundfos International AS
Publication of EP0456596A1 publication Critical patent/EP0456596A1/fr
Application granted granted Critical
Publication of EP0456596B1 publication Critical patent/EP0456596B1/fr
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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2216—Shape, geometry

Definitions

  • the invention relates to a centrifugal pump comprising a casing and a rotary impeller provided with one or two cover plates and a plurality of spacing blade means fastened thereto, wherein each spacing blade means, radially seen, comprises an outer, solid section and an inner section having at least one cavity, the outer section forming an integral part with the inner section or being joined therewith, each section comprising one or more web segments.
  • DE-PS No. 2.800.723 discloses a fan impeller, where two successive blades are joined by means of a common base plate adjacent one of the two cover plates.
  • Another known fan impeller comprises blades of bent sheet material. It is, however, not mentioned that the blades are made of simple web segments.
  • Known impellers are expensive to manufacture, as they require a large number of working operations, especially a large number of foldings of the sheet material. Moreover, the impellers are difficult to adapt to a predetermined capacity or pressure. Further, large known pump impellers are known, which are provided with spacing blade means having a cavity.
  • the diameter of the impeller may be altered by turning, thus possibly puncturing a spacing blade means.
  • the pump medium can then flow into the cavity of the spacing blade means, thus having a considerable, negative effect on the flow conditions at the outer periphery of the spacing blade means.
  • US-A-1 030 561 discloses a fan with an impeller arranged in a housing.
  • a kind of spacing blade means is arranged between two cover plates.
  • the sheet material forming the spacing blade means extends a small distance beyond said cover plates.
  • the extending part of the spacing blade means undoubtedly will not contribute to the "pumping" capacity of the fan. Further, this construction is not for liquid but for air.
  • Said sheet material is riveted to the cover plates all the way to the outer periphery of said plates. This prevents a simple adjustment of the capacity by shortening (cutting off) the length of the sheet material.
  • the object of the invention is to provide a centrifugal pump of the above-mentioned type, where the impeller is easily adapted to a variety of different operating conditions (capacity, pressure).
  • the centrifugal pump according to the invention is characterized in that the web segment or segments are fastened to the cover plates by welding or soldering spots at a radius smaller than or equal to 0.85 R from the center of the cover plate, R being the radius of the cover plate, the web segment with the longest radial reach extending not quite as far as to the outer periphery of the cover plate.
  • R being the radius of the cover plate
  • the impeller is easily adapted to the desired operating conditions (capacity, pressure) without affecting the flow conditions at the outer periphery of the impeller, because a slight reduction of the blade diameter is easily made by means of a cutting tool.
  • a small part of the web segment is removed from the outer, solid section but not from the hollow section. The latter remains undamaged, and the flow conditions in the pump are consequently excellent.
  • web segment or segments of the outer section is without connection to the cover plate.
  • it is particularly easy to remove material from the web segment or segments of the outer section during adaptation.
  • the outer and inner sections form an integral part and comprise at least one first curved web segment, preferably two such segments, to define ducts between the spacing blade means, one portion of the first web segment or of one of the web segments, respectively, of each spacing blade means radially projecting further than the remaining portion of the first web segment or of the other web segments, respectively, of the spacing blade means, the projecting part of the abovementioned portion of the first web segment or of one of the web segments, respectively, being without any connection to the cover plate.
  • the web segment with the longest radial projection advantageously extends not quite as far as the cover plate.
  • each spacing blade means comprises at least three relatively small web segments defining at least one closed cavity, resulting in a relatively light impeller. Moreover, it is thus easier to shape a spacing blade means in such a way that the pump medium flows into the duct between two successive spacing blade means at an easily adjustable angle.
  • one or more of the web segments of the inner section form an internal bracing therein, thus increasing the strength of the impeller.
  • the web segments are manufactured with a small crosssection by means of extrusion, resulting in aparticularly inexpensive manufacture of the impeller.
  • the cover plate and the web segments are made of sheet metal, preferably having a thickness of 0.5-3.0 mm, especially 0.8-2.0 mm, thus facilitating manufacture.
  • the end portion of the inner section comprised by the web segment or segments and closest to the centre of the impeller is provided with an inwardly facing nose, optionally only a single projection of the web segment, to ensure a locally defined extension of the cross-section of the duct immediately behind the duct inlet with respect to the flow direction of the pump medium through the duct, thus allowing for the most advantageous design of a duct inlet.
  • the web segments are substantially of C-, S- or wing-shape.
  • each web segment is fastened with two, preferably four, welding or soldering spots.
  • the impeller of Figure 1 rotates inside a casing of a centrifugal pump (not shown).
  • the impeller is provided with one cover plate 8 but may, in principle, be provided with two.
  • the impeller is further provided with a plurality of spacing blade means 2, a pair of spacing blade means defining a duct 4.
  • Each spacing blade means 2 comprises an outer, solid section 2b' and an inner, hollow section, i.e. the section of the spacing blade means 2 situated radially inwardly with respect to the outer section 2b'.
  • the outer, solid section 2b' (cf. also 2bo) may form an integral part with the inner section or may be joined with the latter.
  • the outer section 2b' (optionally 2bo) is thus not directly connected to the cover plate 8.
  • the outer and inner sections may form an integral part and comprise two web segments 2a, 2b. The web segments are fastened to the cover plate by means of welding, preferably spot welding, or soldering.
  • each inner section comprises at least one inner closed cavity
  • the web segment 2b extends as far as the outer peripheral edge 8a of the cover plate 8.
  • a technician assembling the impeller parts can easily shorten the outer section 2b' of the web segment 2b to a greater or lesser extent by means of a simple cutting tool, thus adapting the impeller to a variety of operating conditions.
  • the inner section may be provided with inwardly facing noses, in the present case the radially innermost end 2b'' of the web segment 2b.
  • the portion of the duct 4 forming the duct inlet is locally extended 25, thus creating particularly advantageous flow conditions through the duct 4 in some pump types.
  • a web segment may optionally extend over a considerable distance, as denoted by 2bn at the bottom left corner of Figure 1, without, however, reaching the peripheral edge 8a of the cover plate.
  • a spacing blade means may comprise three web segments, as shown at the bottom right corner of Figure 1, where a web segment 2c forms a bracing.
  • the web segment 2a at the top of Figure 1 may optionally be two web segments adjoining at a bend 15.
  • a spacing blade means 12 may comprise two web segments, cf. Figure 2, one of which 12f is substantially of C-shape, the other 12g substantially of S-shape.
  • a spacing blade means may have the shape of an airplane wing made from one web segment, cf. 12h.
  • a spacing blade means may be made from a single web segment provided with an inwardly facing nose 12m'', cf. 12m.
  • a web segment may be manufactured with a small cross-section by means of extrusion. It is also possible to make the segments and the cover plate of sheet metal having a thickness of preferably 0.5-3.0 mm, especially 0.8-2.0 mm.
  • the web segment of a spacing blade means is fastened to the cover plate by means of welding or soldering spots 20 and within a radius of less than or equal to 0.85 R (R being the radius of the cover plate).
  • R being the radius of the cover plate.
  • a web segment is fastened with at least two, preferably four, welding or soldering spots 20.

Landscapes

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

Claims (10)

  1. Pompe centrifuge comprenant un carter et un rouet tournant (1) pourvu d'un ou de deux flasques (8) et d'une pluralité de moyens formant ailette de séparation (2) reliée à ceux-ci, dans laquelle chaque moyen formant ailette de séparation, vu dans le sens radial, comprend une section externe pleine (2b', 2bo) et une section interne disposant au moins d'une cavité (16, 17), la section externe constituant une seule pièce avec la section interne ou étant reliée avec celle-ci, chaque section comprenant un ou plusieurs segments d'âme, caractérisée par un segment ou des segments d'âme fixés sur l'un des flasques par des points de brasure ou de soudure (20) sur un rayon inférieur ou égal à 0,85 R par rapport au centre (10) du flasque (8), R représentant le rayon du flasque (8), le segment d'âme présentant le radiale la plus longue atteignant une extension non supérieure à la périphérie externe du (des) flasque(s) (8).
  2. Pompe centrifuge selon la revendication 1, caractérisée par un segment ou des segments d'âme de la section externe (2b', 2bo) qui ne présentent pas de liaisons avec le flasque (8).
  3. Pompe centrifuge selon la revendication 1, caractérisée par des sections externe et interne formées en une pièce et comprenant au moins un premier segment d'âme courbe (12m, 12h), de préférence, deux segments analogues (2a, 2b; 2c; 12f, 12g, 12j, 12k), pour définir des conduits (4) entre les moyens formant ailette de séparation, une partie (2b') du premier segment d'âme ou respectivement de l'un des segments d'âme (2b), de chaque moyen formant ailette de séparation étant radialement plus en saillie que la partie restante du premier segment d'âme ou respectivement des autres segments d'âme des moyens formant ailette de séparation, la partie en saillie de la partie (2b') mentionnée précédemment du premier segment d'âme ou respectivement de l'un des segments d'âme ne disposant pas de liaisons avec le flasque.
  4. Pompe centrifuge selon les revendications 1, 2 ou 3 caractérisée en ce que chaque moyen formant ailette de séparation (2) comprend au moins trois segments d'âme relativement petits (2a, 2b, 2c) définissant au moins une cavité fermée (16, 17).
  5. Pompe centrifuge selon l'une ou plusieurs des revendications 1 à 4, caractérisée en ce qu'un ou plusieurs des segments d'âme de la section interne forment un raidisseur interne (2c) dans celle-ci.
  6. Pompe centrifuge selon l'une ou plusieurs des revendications 1 à 5, caractérisée en ce que les segments d'âme sont réalisée par extrusion, avec une faible section transversale.
  7. Pompe centrifuge selon l'une ou plusieurs des revendications 1 à 6, caractérisée par un flasque et des segments d'âme réalisés à partir d'une feuille métallique, de préférence, présentant une épaisseur de 0,5 à 3,0 mm, plus particulièrement de 0,8 à 2,0 mm.
  8. Pompe centrifuge selon l'une ou plusieurs des revendications 1 à 7, caractérisée en ce que la partie d'extrémité (2) de la section interne constituée du segment d'âme (12m) ou des segments d'âme (2b, 12f, 12k) et la plus proche du centre (10) du rouet est pourvue d'un nez faisant face à l'intérieur (12m''), en variante seule une simple saillie (2b'') du segment d'âme, afin d'assurer une extension (34, 25), définie localement, de la section transversale du conduit immédiatement derrière l'entrée du conduit par rapport au sens du débit du fluide pompé à travers le conduit.
  9. Pompe centrifuge selon l'une ou plusieurs des revendications 1 à 8, caractérisée par les segments d'âme (12f, 12g, 12h, 12j, 12k, 12m) globalement en forme de C, de S ou d'aile.
  10. Pompe centrifuge selon la revendication 9, caractérisée par deux, de préférence par quatre points de brasure ou de soudure (20) pour la fixation d'un segment d'âme.
EP19910610041 1990-05-10 1991-05-06 Pompe centrifuge Expired - Lifetime EP0456596B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1172/90 1990-05-10
DK117290A DK164135C (da) 1990-05-10 1990-05-10 Centrifugalpumpe

Publications (2)

Publication Number Publication Date
EP0456596A1 EP0456596A1 (fr) 1991-11-13
EP0456596B1 true EP0456596B1 (fr) 1995-09-06

Family

ID=8101811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910610041 Expired - Lifetime EP0456596B1 (fr) 1990-05-10 1991-05-06 Pompe centrifuge

Country Status (3)

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EP (1) EP0456596B1 (fr)
DE (1) DE69112701T2 (fr)
DK (1) DK164135C (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9168496B2 (en) * 2012-09-17 2015-10-27 Nov Condor, Llc Tub blender pressure booster method and apparatus
CN104613003B (zh) * 2014-11-26 2017-05-03 江苏大学 一种低比转数无过载离心泵叶轮水力设计方法
DE102016225891A1 (de) 2016-12-21 2018-06-21 KSB SE & Co. KGaA Freistrompumpe
CN107100887A (zh) * 2017-06-30 2017-08-29 马鞍山方圆动力科技有限公司 一种新型叶轮

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1030561A (en) * 1910-09-02 1912-06-25 Ernest E Blackmer Fan.
FR1139152A (fr) * 1955-01-14 1957-06-26 Babcock & Wilcox France Rotor modifiable pour ventilateur radial
US4874293A (en) * 1988-11-08 1989-10-17 Gutzwiller H Leslie Modified centrifugal airfoil fan wheel

Also Published As

Publication number Publication date
EP0456596A1 (fr) 1991-11-13
DK117290D0 (da) 1990-05-10
DK164135B (da) 1992-05-11
DK117290A (da) 1991-11-11
DK164135C (da) 1992-10-12
DE69112701T2 (de) 1996-03-21
DE69112701D1 (de) 1995-10-12

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