EP0496084A1 - Rouet pour pompes centrifuges - Google Patents

Rouet pour pompes centrifuges Download PDF

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Publication number
EP0496084A1
EP0496084A1 EP91121752A EP91121752A EP0496084A1 EP 0496084 A1 EP0496084 A1 EP 0496084A1 EP 91121752 A EP91121752 A EP 91121752A EP 91121752 A EP91121752 A EP 91121752A EP 0496084 A1 EP0496084 A1 EP 0496084A1
Authority
EP
European Patent Office
Prior art keywords
blades
openings
disc
impeller
disk
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.)
Withdrawn
Application number
EP91121752A
Other languages
German (de)
English (en)
Inventor
Walter Dipl.-Ing. Nagel
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.)
Philipp Hilge GmbH
Original Assignee
Philipp Hilge GmbH
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 Philipp Hilge GmbH filed Critical Philipp Hilge GmbH
Publication of EP0496084A1 publication Critical patent/EP0496084A1/fr
Withdrawn legal-status Critical Current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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers

Definitions

  • the present invention relates to an impeller for centrifugal pumps, consisting of a hub, two disks, namely a cover disk and a hub disk, and of blades which extend between the cover disk and the hub disk.
  • the present invention also relates to a method for producing impellers, which consist of a hub, two discs, namely a hub disc and a cover disc, and of impeller blades, the hub disc and cover disc being connected to one another via the blades.
  • Such impellers for centrifugal pumps are also known as "closed impellers".
  • open impellers in which one completely dispenses with a cover plate.
  • Both open and closed impellers are used in suitable pump housings, however in the case of open impellers the air gap which remains between the free edges of the blades and the housing of the pump must be kept as narrow as possible in order to achieve sufficient pump performance can.
  • this requires high precision in the manufacture of the housing and also of the blades, the pump having to be adequately protected against both mechanical and thermal loads, because such loads can adversely affect the gap width between the blades and the housing, in the worst case by Contact between the blades and the housing can also cause serious damage.
  • the above-mentioned closed impellers are often preferred, especially since they can be produced from comparatively thin metal sheets or from rolled material because of their mechanically more stable structure.
  • a defined gap affects the stability of the connection, particularly in the case of long, strongly curved blades.
  • the present invention has for its object to provide an impeller with the features mentioned above, which enables easy, well-defined and secure connection of the impeller blades with the respective second disc.
  • This object is achieved by openings in one of the disks for the passage of tools, the openings extending along the contour of the blades.
  • a one-piece design of one of the disks with the blades is preferred, it also being advantageous if the width of the openings at least in the radially inner region of the blades corresponds approximately to their height.
  • the object on which the invention is based is achieved in that an opening is made in each of the disks parallel to the contour of the blades provided, and that at least one of the disks is connected to the blades by means of tools which engage through the openings in the interior of the impeller.
  • the blades are formed in one piece with the cover plate and the corresponding openings are accordingly also provided in the cover plate.
  • all the measures that result from this for the specific formation of the openings and the manufacturing measures can also be transferred in a completely analogous manner to the reverse case, in which the openings are formed in the hub disc and the free edges of the inwardly curved blades subsequently be connected to the continuous cover plate.
  • the method is advantageously further developed in such a way that, parallel to the contour of the blades provided, a first slot is made in one of the disks, from the radially inner end section of which a second slot extends, the direction of which has a component perpendicular to the first end section and which is at radial height the inner edge of the blades ends, and that the area delimited by the slots in a width that the Blade width corresponds and is bent approximately perpendicular to the surface of the disc inwards and that the free, inwardly curved edge of the resulting blade is connected to the opposite disc.
  • the latter design and manufacture of the impellers provide a one-piece design of the impeller blades with one of the disks from the outset, the other free edge, which is still to be connected to the second disc, easily passed through the openings running along the contour of the blades for Appropriate welding tools are accessible and can be easily connected to the second disc in this way. From the point of view of production, it is ultimately irrelevant with which of the two disks the blades are formed in one piece and with which the free edges of the blades are connected. A welded connection between the blade edges and the second disk does not necessarily have to be provided, and the blade edges could also be brazed and possibly even glued. With all types of connection, however, the blade edge remains easily accessible through the openings running along the blade contour, so that a very well-defined connection can be obtained and any points of attack for crevice corrosion and the like can be avoided.
  • the free edges of the blades are preferably connected to the remaining disk by welding.
  • the openings should extend from the radially inner edge of the blades to the outer edge of the cover disk.
  • the openings are expediently widened in their radially outer region.
  • the blades in their radially outer area run at a relatively acute angle to the circumference of the cover or hub disk. Since the openings as gaps or slots essentially follow the contour of the blades, a correspondingly tapered section of the cover disk of the blades would remain in the radial end region of these openings.
  • the first The slot ends before the circumference of the disk, in which case a third slot would have to be provided essentially parallel to the circumferential direction of the disk or approximately perpendicular to the outer end of the first slot in order to be able to bend the blade out of the plane of the disk.
  • the corresponding blade would not extend to the circumference of the disk; a narrow bridge would then remain on the outer edge of the pane, which guarantees additional mechanical stability.
  • the impeller blades in the preferred embodiment of the invention are produced by bending the region delimited by the slots, it is understood that the width of the openings which are produced essentially corresponds to the height of the impeller blades.
  • the opening width is accordingly also essentially constant, at least in the radially inner region.
  • the radially outer region can optionally be widened by removing the tapered end sections of the cover disk strips formed next to the openings.
  • the width of the opening along the contour of the blades also changes accordingly.
  • the impeller blades have a greater height in the radially inner region, so that the width of the opening gradually decreases in the radial direction from the inside to the outside, the openings in the radially outer region finally being able to be widened again.
  • openings are made along the contour of the blades provided in one of the disks, so that the lateral blade edges to be connected to the disks remain easily accessible even if one of the disks is already connected to one of the blade edges is.
  • a slot is first cut into the disk, again preferably into the cover disk, which has essentially the same curved shape as the finished blades of the impeller.
  • a further slot is then made from the radially inner end section of this first slot, which runs approximately perpendicular to the end section of the first slot, but at least has a component perpendicular to the direction of this end section.
  • the length of this second slot essentially corresponds to the height of the impeller blade at its radially inner end.
  • the second slot preferably extends on the concave side of the continuously curved first slot. The area of the pane bounded by the two slots then becomes inward bent, the bending edge starting from the end of the second slot and being substantially parallel to the first slot.
  • the distance between the bending edge and the first slot also varies in such a way that the part of the disk bent inwards between the slot and the bending edge corresponds exactly to the height of the impeller blade in the respective area.
  • slit-shaped openings are formed on the convex side of the blades and immediately in front of them in the disk, the width of which corresponds to the height of the impeller blades and which are therefore sufficiently large for the passage of welding tools with the aid of which the bent free edge of the impeller blades adjoins the opposite disc, preferably the hub disc, can be welded.
  • the good accessibility of this edge through the openings mentioned makes it possible to produce a clean weld seam that is not endangered by crevice corrosion.
  • this has a number of slot-shaped openings which exactly follow the contour of the individual blades, so that the cover disk is divided into a corresponding number of segments, the edges of which also have this curved course.
  • the radially outer ends of these individual segments are, however, very narrow and tapering due to the curved shape.
  • these free ends are cut off for reasons of easier production and to increase the dynamic stability.
  • the openings then have the shape shown by way of example in FIGS. 2 or 3.
  • Figure 1 can be seen in the axial section shown on the left, the central hub 4, on which the hub disc 3 is concentrically attached. Opposite in the axial direction of the hub disk 3, one can see the slightly conical cover disk 1, which, instead of the conical shape, can also have the shape of a flat circular ring. Impeller blades 2 extend between the cover disk 1 and the hub disk 3, the curved course of which can be seen from the hatched tracks in the cross section shown on the right in FIG. 1, along the line A-A in the left part of FIG. 1. The annular gap formed between the hub 4 and the cover disk 1 forms the so-called suction mouth 10 of the impeller.
  • the impeller rotates counterclockwise, so that the medium is driven by the impeller blades 2 in the radial direction to the outside and sucked through the suction mouth 10.
  • a housing not shown in the figures, has correspondingly aerodynamically designed suction and outlet openings which connect to the suction mouth 10 or to the radial outside of the impeller.
  • FIG. 2 shows an impeller according to the present invention, which differs from the impeller according to the prior art essentially by the openings 9 in the cover plate 1 and by the integral design of the blades 2 with the cover plate 1.
  • the line of intersection for the view shown in the left part of FIG. 2 is the line BB in the right part in FIG. 1. Since the blades 2 are produced by slitting the cover plate 1 and by bending corresponding parts of the cover plate inwards, openings 9 in are also necessarily formed formed of the cover plate, which run along the convex front of the blades 2. This can be clearly seen in the right part of FIG. 2. Furthermore, in the right part in FIG. 2, welded seams 5 are indicated by corresponding hatching, which connect the free edges of the blades 2 to the hub disk 3.
  • the openings 9 initially have a constant width, which takes into account the fact that the part bent out of this opening also forms an impeller blade 2 of constant height. In principle, the opening could continue in this width up to the outer edge of the cover plate 1.
  • the cover plate 1 is divided into individual segments 11 in accordance with the number of openings 9.
  • the tapered ends 11 '(see FIG. 4) of these segments 11 are, however, separated for reasons of simpler manufacture and the dynamic stability of the impeller, so that the openings 9 in the radially outer region are widened to the edge of the disk.
  • FIG. 3 shows an embodiment of the invention, which is very similar in its basic features to the embodiment according to Figure 1, with the difference, however, that in the embodiment shown in Figure 3, the height of the impeller blades 2 decreases in the radial direction from the inside to the outside. Since the blades are bent out of the cover disk 1 to form the opening 9, this opening 9 must accordingly be wider in the radially inner region than in the radially outer region, where the impeller blades have a lower height. It can be seen in the right-hand part of FIG. 3 that the openings are actually somewhat wider in the radially inner region and initially narrow with a greater radial distance, with an expansion to the edge of the cover disk then being provided around the tapering ends of the Avoid segments 11.
  • a cover plate is schematically drawn in plan view, the lines for slots to be made are shown in broken lines, dash-dotted lines or dotted lines.
  • the cutting out or production of one of the openings 9 is described by way of example.
  • one first begins by cutting or punching a slot along the line 6. Along the line 12, the protruding, tapering end 11 'of the segment 11 is then cut off. Furthermore, starting from the end of the slot 6, a further slot 7 is cut into the cover plate, so that the part of the cover plate lying between the line 13 and the slot 6 can be bent inward as a blade 2 along the fold line 13.
  • One edge of the slot 6 then forms the inwardly bent free edge of the blade 2, which is to be welded to the hub disk.
  • the buckling line 13 does not run parallel to the slot line 6, but at a gradually decreasing distance, so that the bent part always corresponds to the respective blade height.
  • the exact direction and length of the slot 7 and possibly also the slot 8 also depends on the course of the curvature of the blade, the bending technique, the deformability of the disk material and the desired course of the radial end edges of the blades 2. However, these slots essentially run perpendicular to the slot 6 and more or less in the circumferential direction of the disk.
  • a further embodiment which is shown by way of example at an opening 9 in FIG. 4, is obtained by making a third slot 8 at the radially outer end of a slot 6 which does not extend all the way to the circumference of the cover plate.
  • the impeller blade 2 is then again formed by bending the area enclosed between the slots.
  • a separation along the line 12 is then omitted, since in this case the end sections of the segments 11 are connected via the webs 14 delimiting the openings 9 radially on the outside and are therefore sufficiently stable.
  • the effective blade length in the radial direction is then somewhat less than in the previously described embodiment.
  • the costs for punching and bending tools make it necessary to assemble the cover disk 1 (or the hub disk 3) from individual segments, each with at least one molded-on blade.
  • the number of individual segments may therefore correspond to the number of blades.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP91121752A 1991-01-23 1991-12-19 Rouet pour pompes centrifuges Withdrawn EP0496084A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4101868 1991-01-23
DE19914101868 DE4101868A1 (de) 1991-01-23 1991-01-23 Laufrad fuer kreiselpumpen

Publications (1)

Publication Number Publication Date
EP0496084A1 true EP0496084A1 (fr) 1992-07-29

Family

ID=6423524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91121752A Withdrawn EP0496084A1 (fr) 1991-01-23 1991-12-19 Rouet pour pompes centrifuges

Country Status (2)

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EP (1) EP0496084A1 (fr)
DE (1) DE4101868A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1055825A3 (fr) * 1999-05-22 2000-12-27 KSB Aktiengesellschaft Rouet assemblé
CN104279007A (zh) * 2014-09-23 2015-01-14 张朝刚 一种无轴向心涡轮
EP3536138A1 (fr) * 2018-03-09 2019-09-11 TTI (Macao Commercial Offshore) Limited Fixation de ventilateur pour une tête de tondeuse

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4330098A1 (de) * 1993-09-06 1995-03-09 Klein Schanzlin & Becker Ag Als Blechformteil ausgebildete Leiteinrichtung
JPH1019107A (ja) * 1996-07-03 1998-01-23 Exedy Corp タービンシェルの加工法
DE10034195C1 (de) * 2000-07-13 2002-04-04 Luebecker Maschb Gmbh Baggerpumpe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54137102A (en) * 1978-04-17 1979-10-24 Ebara Corp Manufacturing method of semi-open type impeller
JPS56110599A (en) * 1980-02-07 1981-09-01 Shibaura Eng Works Co Ltd Impeller
JPS5862399A (ja) * 1981-10-07 1983-04-13 Hitachi Ltd ポンプ用羽根車
JPS58101296A (ja) * 1981-12-11 1983-06-16 Hitachi Ltd ポンプ鋼板製羽根車
JPS58159934A (ja) * 1982-03-17 1983-09-22 Akaishi Kinzoku Kogyo Kk 冷却フアンとその製法
EP0310121A2 (fr) * 1987-09-30 1989-04-05 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Procédé de fabrication de dispositifs de refoulement et/ou de direction pour machines à écoulement et impulseur radial réalisé selon ce procédé, en particulier impulseur de fluide de refroidissement pour moteurs à combustion

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54137102A (en) * 1978-04-17 1979-10-24 Ebara Corp Manufacturing method of semi-open type impeller
JPS56110599A (en) * 1980-02-07 1981-09-01 Shibaura Eng Works Co Ltd Impeller
JPS5862399A (ja) * 1981-10-07 1983-04-13 Hitachi Ltd ポンプ用羽根車
JPS58101296A (ja) * 1981-12-11 1983-06-16 Hitachi Ltd ポンプ鋼板製羽根車
JPS58159934A (ja) * 1982-03-17 1983-09-22 Akaishi Kinzoku Kogyo Kk 冷却フアンとその製法
EP0310121A2 (fr) * 1987-09-30 1989-04-05 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Procédé de fabrication de dispositifs de refoulement et/ou de direction pour machines à écoulement et impulseur radial réalisé selon ce procédé, en particulier impulseur de fluide de refroidissement pour moteurs à combustion

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 158 (M-86)25. Dezember 1979 & JP-A-54 137 102 ( EBARA SEISAKUSHO ) 24. Oktober 1979 *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 189 (M-99)28. November 1981 & JP-A-56 110 599 ( SHIBAURA ) 1. September 1981 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 157 (M-227)(1302) 9. Juli 1983 & JP-A-58 062 399 ( HITACHI SEISAKUSHO ) 13. April 1983 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 203 (M-241)(1348) 8. September 1983 & JP-A-58 101 296 ( HITACHI SEISAKUSHO ) 16. Juni 1983 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 283 (M-263)(1428) 16. Dezember 1983 & JP-A-58 159 934 ( AKAISHI KINZOKU KOGYO ) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1055825A3 (fr) * 1999-05-22 2000-12-27 KSB Aktiengesellschaft Rouet assemblé
CN104279007A (zh) * 2014-09-23 2015-01-14 张朝刚 一种无轴向心涡轮
EP3536138A1 (fr) * 2018-03-09 2019-09-11 TTI (Macao Commercial Offshore) Limited Fixation de ventilateur pour une tête de tondeuse
CN110235594A (zh) * 2018-03-09 2019-09-17 创科（澳门离岸商业服务）有限公司 用于修剪器头部的鼓风附接件

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Publication number Publication date
DE4101868A1 (de) 1992-07-30

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