EP0250973B1 - Zentrifugalpumpe - Google Patents

Zentrifugalpumpe Download PDF

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Publication number
EP0250973B1
EP0250973B1 EP19870108462 EP87108462A EP0250973B1 EP 0250973 B1 EP0250973 B1 EP 0250973B1 EP 19870108462 EP19870108462 EP 19870108462 EP 87108462 A EP87108462 A EP 87108462A EP 0250973 B1 EP0250973 B1 EP 0250973B1
Authority
EP
European Patent Office
Prior art keywords
window
pump
centrifugal pump
wall part
pump according
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
EP19870108462
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0250973A3 (en
EP0250973A2 (de
Inventor
Ernst Dipl.-Ing. Ashauer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0250973A2 publication Critical patent/EP0250973A2/de
Publication of EP0250973A3 publication Critical patent/EP0250973A3/de
Application granted granted Critical
Publication of EP0250973B1 publication Critical patent/EP0250973B1/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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the invention relates to a centrifugal pump with a pump wheel, which is arranged centrally behind an inlet opening and is surrounded by a pump chamber, to which a collecting space adjoins, which has an outlet opening.
  • a pump of this type is described in DE-A-29 01 456.
  • Such pumps are known as submersible pumps or as pumps with a hose connection and are used, for example, for the water supply in camping sites.
  • a collection chamber adjoins the pump chamber and has an outlet opening.
  • the invention is therefore based on the object of designing a centrifugal pump of the type mentioned at the outset in such a way that improved suction performance - even compared to air cushions - is possible.
  • the pump chamber is closed in the radial direction by side walls opposite the collecting space, that the side walls have at least one passage window, and that the total window area is between 100 and 200% of the size of the entrance opening.
  • the centrifugal pump according to the invention thus has a side wall separating the pump chamber and the collecting space, which is interrupted on its peripheral surface by at least one passage window.
  • a side wall separating the pump chamber and the collecting space, which is interrupted on its peripheral surface by at least one passage window.
  • several, in particular up to four windows are provided, so that wall parts alternate with windows and wall parts without windows over the circumference of the side wall.
  • centrifugal pump according to the invention provides a significantly improved suction power and is able to completely remove smaller air cushions standing at the inlet opening, so that undisturbed pumping of the liquid is achieved.
  • the size of the area of the windows is between 100 and 150% of the size of the cross section of the entrance opening.
  • the windows have tapered edges parallel to the axis of the pump wheel, which are formed by a continuous reduction in the wall thickness - preferably in the tangential direction - to the inner diameter of the side walls.
  • the inner walls of the side wall are arranged in an area that is 20 to 40% . is larger than the diameter of the pump wheel.
  • the height of the windows corresponds approximately to the height of the pump wheel. Furthermore, the ratio of the length of the side wall parts without a window to the length of the side wall parts with a window on the inner radius of the side wall should be at least 1: 1.
  • the side wall designed according to the invention for the pump chamber is preferably formed by appropriately designed lugs on the front wall part and the rear wall part (in the direction of flow) of the housing forming the pump chamber.
  • the front or the rear wall part can be comb-shaped to form the windows, the other part in each case having an annular web, on the inner wall of which the outer walls of the free ends of the comb-shaped wall part rest.
  • the manufacture of the windows is also technically simple in that the front and rear wall parts each have an annular web, which hold an annular comb part or perforated part which has the windows centrally.
  • FIG. 1 shows a section through a submersible pump working as a centrifugal pump, as can be used, for example, for the water supply in camping sites.
  • the submersible pump has an essentially cylindrical motor housing 1 which consists of two housing parts 2, 3 which are connected to one another in a suitable manner.
  • the upper housing part 2 of the motor housing 1 has an upper end wall with a through opening 4 through which an electrical connection cable 5 is passed in a sealed manner.
  • the lower housing part 3 sets the cylindrical wall of the upper one Housing part 2 continues and forms a base piece 6, which has a cylindrical inwardly facing annular extension 7, on which a motor 8 is mounted and through which a motor shaft 9 is guided, on which a pump wheel 10 is fastened.
  • the pump wheel 10 is shown in FIG. 1 for reasons explained in more detail below only to the right of the motor axis 9.
  • the lower housing part of the motor housing 1 has at its lower end an annular, downwardly open chamber 11 which merges into an upwardly open hose connection 12 on one side.
  • a pump base part 13 is inserted which, together with the lower contour of the base side 6 of the motor housing 1, forms the annular chamber 11 serving as a collecting chamber and a pump chamber 14 surrounding the pump wheel 10.
  • the pump base part 13 has three support feet 15 on which the pump stands. Between the support feet 15 there is an input opening 16 which is coaxial with the motor shaft 9 and into which the free end of the motor shaft projects.
  • the liquid is directed upwards through correspondingly curved wall pieces, since the collecting space 11 lies both radially outside and above the pump chamber 14.
  • the liquid entering the pump chamber 14 through the inlet opening 16 is thrown outwards by the vanes of the rotating pump wheel 10 and deflected upwards in the above-mentioned way, so that it reaches the collecting space 11.
  • the hose connector 12 Via the hose connector 12, the liquid passes under pressure into supply hoses, at the ends of which it can be removed.
  • an annular, closed side wall 17 is arranged centrally around the motor shaft 9 between the pump chamber 14 and the collecting space 11.
  • the distance between the side wall 17 and the vanes of the pump wheel 10 results from the fact that the inside diameter of the side wall 17 is approximately 1.25 times the pump wheel diameter.
  • Two windows 18 are arranged in the side wall, of which the left half can be clearly seen in FIG. 1 because the half of the pump wheel 10 lying on the left side of the motor axis 9 is not shown.
  • the windows 18 have approximately the height of the wings of the impeller 10. Their length results from the fact that the total cross section of the windows corresponds to the cross section of the entrance opening 16 or is up to 50% larger.
  • the vertical edges 19 of the windows 18, that is to say parallel to the motor axis 9, against which the liquid thrown outward flows, are sharp.
  • the wall thickness of the side wall 17 in the area of the relevant edge 19 is continuously reduced toward the inner radius, so that the pointed edge 19 is formed in the area of the inner radius.
  • edges 19 is illustrated in FIG. 2 for a pump running in both directions of rotation. If only one direction of rotation is provided for the pump, only one edge 19 needs to be made pointed at a time.
  • the inner circle schematically indicates the diameter of the pump wheel 10.
  • FIG. 3 shows a modified embodiment of the submersible pump according to FIG. 1.
  • the modification consists in the submersible pump having a collecting space 11 ′ which extends over the entire height of the housing 1 and has a hose connection above the motor housing 1.
  • the remaining arrangement essentially corresponds to the arrangement according to FIG. 1 and is not explained again in order to avoid repetitions.
  • FIG. 4 illustrates the transition from the pump chamber 14 into the annular collecting chamber 11 'through the windows 18.
  • the side wall 17 tapers inwards towards the window in order to effectively oppose the water thrown outwards by the pump wheel 10 and a defined pointed edge not a wider area that could cause swirling of the flowing water.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19870108462 1986-07-02 1987-06-11 Zentrifugalpumpe Expired - Lifetime EP0250973B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3622168 1986-07-02
DE19863622168 DE3622168A1 (de) 1986-07-02 1986-07-02 Zentrifugalpumpe

Publications (3)

Publication Number Publication Date
EP0250973A2 EP0250973A2 (de) 1988-01-07
EP0250973A3 EP0250973A3 (en) 1989-12-13
EP0250973B1 true EP0250973B1 (de) 1991-01-23

Family

ID=6304216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870108462 Expired - Lifetime EP0250973B1 (de) 1986-07-02 1987-06-11 Zentrifugalpumpe

Country Status (2)

Country Link
EP (1) EP0250973B1 (enrdf_load_stackoverflow)
DE (2) DE3622168A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3837330A1 (de) * 1988-11-03 1990-05-10 Ashauer Ernst Zentrifugalpumpe
DE10318862B4 (de) * 2002-12-18 2006-03-09 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes Haushaltgerät mit einer Entleerungspumpe sowie Entleerungspumpe

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1832619A (en) * 1927-08-08 1931-11-17 Johnson Motor Company Pump
US2540269A (en) * 1946-01-28 1951-02-06 Tecalemit Ltd Centrifugal pump
GB984235A (en) * 1962-01-11 1965-02-24 Pegg S & Son Ltd Pump
JPS5134008Y2 (enrdf_load_stackoverflow) * 1973-10-16 1976-08-23
DE2526003A1 (de) * 1974-06-14 1976-01-02 Lucas Electrical Co Ltd Pumpe
DE2446862C2 (de) * 1974-10-01 1986-01-23 Allweiler Ag, 7760 Radolfzell Pumpengehäuse für eine stopfbüchsenlose Heizungsumwälzpumpe
NO138754C (no) * 1976-12-28 1978-11-08 Norsk Hydro As Fremgangsmaate og pumpeanordning for overfoering av flytende fluidum
DE2901456C3 (de) * 1979-01-16 1983-01-05 Reich KG, Regel- und Sicherheitstechnik, 6340 Dillenburg Elektrisch betriebene Kleinpumpe

Also Published As

Publication number Publication date
DE3767585D1 (de) 1991-02-28
DE3622168A1 (de) 1988-01-14
EP0250973A3 (en) 1989-12-13
DE3622168C2 (enrdf_load_stackoverflow) 1989-12-28
EP0250973A2 (de) 1988-01-07

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