EP0456596A1 - Kreiselpumpe - Google Patents

Kreiselpumpe Download PDF

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Publication number
EP0456596A1
EP0456596A1 EP91610041A EP91610041A EP0456596A1 EP 0456596 A1 EP0456596 A1 EP 0456596A1 EP 91610041 A EP91610041 A EP 91610041A EP 91610041 A EP91610041 A EP 91610041A EP 0456596 A1 EP0456596 A1 EP 0456596A1
Authority
EP
European Patent Office
Prior art keywords
web
centrifugal pump
segments
cover plate
blade means
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
EP91610041A
Other languages
English (en)
French (fr)
Other versions
EP0456596B1 (de
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/de
Application granted granted Critical
Publication of EP0456596B1 publication Critical patent/EP0456596B1/de
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 a cover plate and a plurality of spacing blade means fastened thereto.
  • 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 in the form of hollow cavities.
  • 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.
  • 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).
  • 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.
  • 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 adaptation of the blade diameter by turning only results in removing material 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.
  • the outer section is without connection to the cover plate.
  • it is particularly easy to remove material from 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 above-mentioned 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 cross-section by means of extrusion, resulting in a particularly 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.
  • An especially reliable fasting of the blades is, according to the invention, obtained by the web segment or segments of a spacing blade means being fastened to the cover plate by welding or soldering spots at a radius smaller than or equal to 0.85 R, R being the radius of the cover plate.
  • 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 2b o ) may form an integral part with the inner section or may be joined with the latter.
  • the outer section 2b′ (optionally 2b o ) is thus not directly connected to the cover plate 8.
  • each inner section may comprise two web segments 2a, 2b.
  • the web segments may be fastened to the cover plate by means of welding, preferably spot welding, or soldering.
  • each inner section comprises at least one inner closed cavity 6.
  • 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 2b o 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 may be 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).
  • a web segment may be fastened with at least two, preferably four, welding or soldering spots 20.
  • the invention may be varied in many ways without thereby deviating from the scope of the invention.
  • the web segments may, for instance, be cast with the cover plate.

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)
EP19910610041 1990-05-10 1991-05-06 Kreiselpumpe Expired - Lifetime EP0456596B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=8101811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910610041 Expired - Lifetime EP0456596B1 (de) 1990-05-10 1991-05-06 Kreiselpumpe

Country Status (3)

Country Link
EP (1) EP0456596B1 (de)
DE (1) DE69112701T2 (de)
DK (1) DK164135C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140078856A1 (en) * 2012-09-17 2014-03-20 Jorge O. Arribau Tub blender pressure booster method and apparatus
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
WO2018114143A1 (de) * 2016-12-21 2018-06-28 KSB SE & Co. KGaA Freistrompumpe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (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

Patent Citations (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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140078856A1 (en) * 2012-09-17 2014-03-20 Jorge O. Arribau Tub blender pressure booster method and apparatus
US9168496B2 (en) * 2012-09-17 2015-10-27 Nov Condor, Llc Tub blender pressure booster method and apparatus
WO2018114143A1 (de) * 2016-12-21 2018-06-28 KSB SE & Co. KGaA Freistrompumpe
US11187232B2 (en) 2016-12-21 2021-11-30 KSB SE & Co. KGaA Vortex pump
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

Also Published As

Publication number Publication date
DK164135C (da) 1992-10-12
EP0456596B1 (de) 1995-09-06
DE69112701D1 (de) 1995-10-12
DK117290A (da) 1991-11-11
DE69112701T2 (de) 1996-03-21
DK117290D0 (da) 1990-05-10
DK164135B (da) 1992-05-11

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