EP0369268B1 - Laufrad für Strömungsmaschinen - Google Patents

Laufrad für Strömungsmaschinen Download PDF

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Publication number
EP0369268B1
EP0369268B1 EP89120438A EP89120438A EP0369268B1 EP 0369268 B1 EP0369268 B1 EP 0369268B1 EP 89120438 A EP89120438 A EP 89120438A EP 89120438 A EP89120438 A EP 89120438A EP 0369268 B1 EP0369268 B1 EP 0369268B1
Authority
EP
European Patent Office
Prior art keywords
impeller
ring element
cover plate
parts
hub
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
EP89120438A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0369268A2 (de
EP0369268A3 (en
Inventor
Axel Riel
Primo Lovisetto
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.)
KSB AG
Original Assignee
KSB AG
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 KSB AG filed Critical KSB AG
Priority to AT89120438T priority Critical patent/ATE84852T1/de
Publication of EP0369268A2 publication Critical patent/EP0369268A2/de
Publication of EP0369268A3 publication Critical patent/EP0369268A3/de
Application granted granted Critical
Publication of EP0369268B1 publication Critical patent/EP0369268B1/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
    • F04D29/26—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/025—Fixing blade carrying members on shafts
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/54—Building or constructing in particular ways by sheet metal manufacturing

Definitions

  • the invention relates to an impeller according to the preamble of the main claim.
  • US-A 2 344 444 shows an impeller on the hub of which U-shaped blade channels are arranged in a radial direction in the radial direction and are connected to a radially extending pressure-side impeller cover disk.
  • This solution may have sufficient strength, but due to the shape of the blade used, the flow properties are disadvantageous.
  • DE-B 1 703 266 shows a solution common in small heating circulating pumps, according to which a frictional connection between a pressure-side impeller hub acting as a hub and a conical part on the pump shaft is provided.
  • WO 86/06799 shows a solution in which the pressure-side impeller cover disk is pressed against the impeller hub with an impeller fastening nut.
  • the object of the invention is to develop a construction for impellers of turbomachines which are composed of several individual parts and which have a high fatigue strength without impairing the flow properties. This object is achieved in accordance with the characterizing part of the main claim.
  • the design according to the invention ensures that, on the one hand, attachment is carried out on the smallest possible radius, which is subject to little centrifugal force.
  • a major advantage is that hydraulic forces prevailing in the impeller inlet area can be introduced directly into the hub. This relieves the hydraulic forces of the connection between the beginning of the blade and the impeller cover plate on the pressure side. Furthermore, direct power transmission from the torque-introducing hub into the blades is possible. By means of the separation made in this way, tension within the impeller can be substantially avoided and a higher strength is the direct result.
  • An embodiment of the invention provides that an impeller fastening device presses the ring element or the ring element parts against the hub end face and / or the impeller cover disk on the pressure side located in this area. With the help of the impeller attachment device a safe Pressure or fastening of the loaded blade parts in the hub area guaranteed. This measure, which serves to simplify production, allows prefabrication of the parts to be joined and results in easier impeller assembly.
  • an embodiment of the invention provides that a pressure element is attached to the ring element or to the parts forming a ring element. Furthermore, another embodiment of the invention provides that the ring element, the ring element parts or the pressure element are designed to transmit torque. This reliably prevents the blade beginnings from being overstressed due to bending forces. As a result of the direct introduction of force into the blades or into the blade feet, there is no risk of overloading the connection between the blades or the blade feet and the impeller cover disk on the pressure side.
  • the force can be introduced here by a known tongue and groove connection, splined shaft or the like.
  • impeller fastening device which can be designed as a nut, for example, from twisting between the blade and the impeller cover plate on the pressure side when tightened. Also, no relative rotation between the blades and the impeller cover plate on the pressure side can take place during operation.
  • a further embodiment of the invention provides that the pressure-side impeller cover disk, the ring element or the ring element parts and / or the pressure element are arranged in a materially bonded, glued, frictional or positive manner in the area of the hub end face.
  • Appropriate welded connections or pressing the ring element or the ring element parts into a correspondingly shaped hub end face ensures a secure transmission of forces between the individual parts.
  • Another embodiment shows that in the case of hubs whose outer diameter is greater than the diameter in the fastening area between the hub end face and the pressure-side impeller cover disk, in the larger diameter area there is a free space between the hub and the pressure-side impeller cover disk.
  • an impeller (1) radial design is shown, which is mounted on a shaft (2).
  • a force is introduced from the shaft into a hub (4) via a tongue and groove connection (3), to the hub end face (5) of which a pressure-side impeller cover plate (6) is fastened by means of a welded connection (7).
  • a hub disk (8) supports the impeller cover disk (6) on the pressure side with respect to the hub (4), the parts here also being held together using welding technology.
  • the impeller cover disk (6) on the pressure side is connected to the hub (4) only in the area of the welded joint (7).
  • a region of the hub end face (5) which is located on a larger diameter and which is downstream of the welded connection has a free space (9) in order to rule out contact and thus tension between the parts.
  • the larger hub outer diameter may be necessary in those cases in which a large torque has to be transmitted from the shaft.
  • each blade (10) is provided with a ring element part (11), as shown in FIGS. 6 and 7, and is therefore welded to the hub end face (5).
  • An impeller fastening device (12) presses a pressure element (13) which is in engagement with the tongue and groove connection (3) and the parts arranged on the hub end face.
  • the hub is supported on a shaft shoulder (14).
  • the hub end face (5) is rounded in this exemplary embodiment and has a design which additionally ensures a positive connection with the ring element parts (11) attached to the blades.
  • a connection in this case a welded connection (15), takes place between the blades (10) and the impeller cover disk (6) on the pressure side, in the region of a plane which is perpendicular or almost perpendicular to the pump shaft (2). This eliminates tension in the curved blade area.
  • the impeller cover disk (16) on the suction side and a suction mouth (17) are fastened to the blades (10).
  • FIG. 2 shows a variant in which the ring element parts (11) are connected to the pressure element (13), and these parts are pressed by the impeller fastening device (12) against the hub end face (5) which runs flat here. Furthermore, the pressure element (13) has a projection (18) with which it is guided in the hub (4).
  • the ring element parts (11) are connected to the hub face (5) and the pressure element (13) to the ring element parts (11).
  • other connection options are also conceivable.
  • the pressure element (13) and the ring element parts (11) are between the hub end face (5) and the pressure-side impeller cover disk (6).
  • the impeller fastening device (12) then presses the pressure element (13) and ring element parts (11) against the pressure-side impeller cover plate (6).
  • a tongue and groove connection (3) guides the torque to be transmitted into the impeller.
  • a transmission by means of a splined shaft or the like is also possible.
  • FIG. 5 shows that instead of ring element parts that can be attached to the blade, a ring element (19) designed and shown as a separate part can be connected to the blades.
  • a ring element (19) designed and shown as a separate part can be connected to the blades.
  • an adhesive connection or a positive connection there is also the possibility of an adhesive connection or a positive connection. It is therefore readily possible to replace the ring element parts (11) by the ring element (19) in the exemplary embodiments in FIGS. 1 to 4.
  • FIG. 6 shows a perspective view of an individual blade (10), which here has a Z-shaped cross section and on the blade root (20) of which a ring element part (11) is directly molded.
  • the ring element (19) can be connected directly to the blade root (20) by an appropriate design or connection.
  • the bore shown serves as a relief bore for the axial thrust.
  • the top view of the impeller shown in FIG. 7 shows the arrangement of the individual blades (10) and how the individual ring element parts (11) form a ring after assembly.
  • the torque introduced through the tongue and groove connection (3) is transferred evenly and directly to the blades (10). Unfavorable tension can thus be avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Recrystallisation Techniques (AREA)
EP89120438A 1988-11-18 1989-11-04 Laufrad für Strömungsmaschinen Expired - Lifetime EP0369268B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89120438T ATE84852T1 (de) 1988-11-18 1989-11-04 Laufrad fuer stroemungsmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839190A DE3839190C1 (enrdf_load_stackoverflow) 1988-11-18 1988-11-18
DE3839190 1988-11-18

Publications (3)

Publication Number Publication Date
EP0369268A2 EP0369268A2 (de) 1990-05-23
EP0369268A3 EP0369268A3 (en) 1990-08-29
EP0369268B1 true EP0369268B1 (de) 1993-01-20

Family

ID=6367511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89120438A Expired - Lifetime EP0369268B1 (de) 1988-11-18 1989-11-04 Laufrad für Strömungsmaschinen

Country Status (3)

Country Link
EP (1) EP0369268B1 (enrdf_load_stackoverflow)
AT (1) ATE84852T1 (enrdf_load_stackoverflow)
DE (1) DE3839190C1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT506342B1 (de) 2008-01-25 2011-03-15 Bitter Engineering & Systemtechnik Gmbh Laufrad für eine pumpe

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2344444A (en) * 1940-03-29 1944-03-14 Malczewski Jeremi Construction of turbomachines
US2360440A (en) * 1942-01-26 1944-10-17 Evans Prod Co Rotary air impeller
US2882829A (en) * 1956-02-09 1959-04-21 Fmc Corp Fabricated impeller for pumps
US3025069A (en) * 1957-01-14 1962-03-13 Bell & Gossett Co Seat for rotary mechanical seals
DK132807C (da) * 1967-05-05 1976-07-12 Grundfos As Veskepumpe, iser cirkulationspumpe til centralvarmeanleg
DE3517499A1 (de) * 1985-05-15 1986-11-20 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Laufrad
US4720242A (en) * 1987-03-23 1988-01-19 Lowara, S.P.A. Centrifugal pump impeller

Also Published As

Publication number Publication date
EP0369268A2 (de) 1990-05-23
EP0369268A3 (en) 1990-08-29
ATE84852T1 (de) 1993-02-15
DE3839190C1 (enrdf_load_stackoverflow) 1990-04-19

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