EP3662164A1 - Roue mobile pour pompe à eaux usées - Google Patents

Roue mobile pour pompe à eaux usées

Info

Publication number
EP3662164A1
EP3662164A1 EP18750116.8A EP18750116A EP3662164A1 EP 3662164 A1 EP3662164 A1 EP 3662164A1 EP 18750116 A EP18750116 A EP 18750116A EP 3662164 A1 EP3662164 A1 EP 3662164A1
Authority
EP
European Patent Office
Prior art keywords
impeller
angle
blade
less
blades
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.)
Pending
Application number
EP18750116.8A
Other languages
German (de)
English (en)
Inventor
Peer Springer
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 SE and Co KGaA
Original Assignee
KSB SE and Co KGaA
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 SE and Co KGaA filed Critical KSB SE and Co KGaA
Publication of EP3662164A1 publication Critical patent/EP3662164A1/fr
Pending legal-status Critical Current

Links

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
    • F04D29/24—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • 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
    • F04D29/2238—Special flow patterns
    • F04D29/225—Channel wheels, e.g. one blade or one flow channel
    • 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
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2294—Rotors specially for centrifugal pumps with special measures for protection, e.g. against abrasion
    • 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
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F04D29/245—Geometry, shape for special effects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous

Definitions

  • the invention relates to an impeller for centrifugal pumps with at least one blade for conveying solids-containing media.
  • different impellers may be used, for example, channel wheels, free-flow impellers or shovels.
  • Channel wheels are open or closed wheels with a reduced number of blades. 1, 2 or 3 blades in radial or semi-axial impellers have proven successful.
  • free-flow pumps are used to convey solids-containing media.
  • Such free-flow pumps are also referred to as vortex pumps, the delivery rate of which is transferred to the flow medium by a rotating disc with shovels, the so-called free-flow impeller.
  • the blade shape plays a crucial role.
  • the construction of the leading edge is of great importance.
  • the leading edge often fills with fibers present in the fluid being pumped.
  • the fibers are often not removed from the impeller leading edge as Because of the flow resistance on the suction and pressure side, the respective resistance forces are in equilibrium. If there is an accumulation of fibers at the entrance edges, more fibers can accumulate, so that larger occupancies can form. This behavior is particularly favored when ensuring high ball passages.
  • the ball passage is an important parameter for characterizing the usability of sewage pumps.
  • the ball passage is also referred to as a free, unconstrained impeller passage and describes the largest permissible diameter of the solids to ensure a clog-free passage.
  • DE 40 15 331 A1 describes an impeller with only one blade.
  • the Einschaufelrad produced by a casting process forms between a front cover plate and a rear support plate a channel whose cross-section decreases to the inlet of the Einschaufelrades to the outlet.
  • the suction side forms on the first 180 ° of the rotation angle a concentric with the axis of rotation arranged semicircle.
  • the impeller is designed to prevent the occurrence of cavitation erosion.
  • impellers with multiple blades are characterized by higher efficiency.
  • wheels also special requirements for the prevention of deposits by solid Ingredients provided.
  • multi-bladed wheels special measures must be taken to avoid blockages.
  • the object of the invention is to provide an impeller for a sewage pump, are effectively avoided in the deposits.
  • an occupancy of the leading edges with fibers should be prevented.
  • the impeller should also ensure the highest possible efficiency in the centrifugal pump used.
  • the occurrence of cavitation erosion should be avoided.
  • ⁇ is an angle between an edge of the blade and a circumferential direction
  • ⁇ is an angle between an edge of the blade and a meridional direction
  • the associated angle ⁇ and / or ⁇ being smaller than 90 °, preferably smaller than 70 ° executed, in particular less than 50 ° executed.
  • the angle ⁇ is an angle between an entrance edge of the blade and a circumferential direction.
  • the angle ⁇ is an angle between an entrance edge of the blade and a meridional direction.
  • the flow resistance of the fibers is considered for their transport along the leading edge of the blades.
  • the velocity impinging on the leading edge is decomposed into a normal component and a tangential component.
  • the normal component has an impressive effect.
  • the tangential component is responsible for transporting the fibers.
  • both the rotating system and the non-rotating system can be considered. Since the relative velocity can be decomposed into the components of the circumferential direction and the meridional direction, these directions can also be assigned to specific force components.
  • the angle ⁇ is less than or equal to 45 °. Alternatively or additionally, the angle ⁇ may be less than or equal to 45 °.
  • the approach according to the invention results in that in the inner regions of the angle ß no or equal to perform 45 ° and in the outer regions of the angle ⁇ is less than or equal to 45 °.
  • ⁇ is in the range of 0.3 to 0.6.
  • the speed u is the peripheral speed.
  • the symbol R a denotes the outer radius of the blade.
  • the impeller according to the invention makes it possible to operate the centrifugal pump in an operating range with low specific speeds and small peripheral speeds. Due to the transient character, the flow characteristic generated by the impeller according to the invention has a positive effect on the co-conveying behavior.
  • the blades After being transported along the leading edge, the blades slide over the asymmetric and smooth hub directly into the blade channel. In semi-open multi-blades, the transport takes place in the direction of the blade tip, where guide or transport grooves can take over the further processing of the fibers.
  • small angles ⁇ preferably less than 45 ° in the region smaller than the limiting radius R g and small angles a, preferably smaller than 45 °, should dominate in the range greater than the limiting radius R g .
  • the impeller is made semi-open.
  • the impeller is designed as a radial wheel.
  • the impeller may have one or more blades.
  • the impeller has two blades.
  • FIG. 2 shows a view of the suction mouth of the wastewater pump shown in FIG. 1
  • FIG. 3 shows a perspective partial sectional view of the suction mouth region
  • FIG. 4 shows a section through the suction mouth region
  • FIG. 5 is a plan view of the impeller
  • FIG. 6 shows one half of a perspective representation of the impeller
  • FIG. 8 shows a plan view of an impeller defining the angle a.
  • FIG. 1 shows a sectional view through a sewage pump.
  • the centrifugal pump shown in FIG. 1 is a submersible pump.
  • the wastewater mixed with admixtures enters the pump through the suction port 1.
  • Impeller 2 is rotatably connected to a shaft 3, which sets the impeller 2 in rotation.
  • the impeller 2 is arranged in a pump housing 4, which is designed in the embodiment as a spiral housing.
  • In the suction port 1 of the pump projects into an insert 5, which is designed in the embodiment as a wear wall or wear ring.
  • the shaft 3 is rotated by a drive 6 in rotation, which is designed in the embodiment as an electric motor.
  • the drive 6 comprises a rotor 7 and a stator 8.
  • the pump housing 4 is sealed by a housing cover 9.
  • the housing cover 9 is sealed with a mechanical seal 10 with respect to the shaft 3.
  • the shaft 3 is supported by bearing elements 1 1.
  • FIG. 2 shows a view of the centrifugal pump with a view of the suction mouth 1.
  • the impeller 2 comprises two blades 12.
  • the impeller 2 has a hub 13 in its center and is connected to the shaft 3 via a fastening means via this hub 13.
  • FIG. 3 shows a perspective partial sectional view of the components which form the suction mouth 1.
  • the insert 5 is fixed to the pump housing 4.
  • a plurality of bores 15 are provided on the insert 5.
  • the insert 5 can be fastened by means of fastening means on the pump housing 4.
  • the impeller 2 rotates counterclockwise in view of the illustration according to FIG.
  • the impeller 2 is equipped with two blades 12 which are mounted on a support plate 16.
  • the two blades 12 and the support plate 16 are integrally formed.
  • the blades 12 have a curved course.
  • the mixed with solid admixtures medium flows axially through the suction port 1 to the impeller 2 and radially outward away from the impeller 2, so that the medium leaves through the discharge port 14, the centrifugal pump.
  • the blades 12 have a backward curved course. All blades 12 of the impeller 2 are formed congruent to each other and have the same shape. Each blade 12 extends radially outward from the hub 13 with a curvature. In the illustration according to FIG. 3, the two blades 12 are arranged offset by 180 ° relative to one another.
  • FIG. 4 shows a sectional view of the suction mouth region according to the representation in FIG. 3.
  • the insert 5 is a stationary part.
  • the impeller 2 to a rotating component.
  • the blades 12 extend radially outward from the hub 13 in a backward curved course.
  • FIG. 6 shows one half of the impeller 2 seen in a perspective view from the side.
  • the area of the hub 13 is shown here purely to illustrate the structural design of the impeller two cylindrical body. In the design of the impeller 2, this cylindrical shape can be omitted.
  • an entry edge 17 sets at each blade 12.
  • the leading edge 17 of each blade 12 extends between the two points A and B.
  • FIG. 7 shows the region of the leading edge 17 shown in black.
  • the angle ⁇ results between the two auxiliary lines 18 and 19.
  • the angle ⁇ is less than or equal to 45 °.
  • ⁇ represents an angle between an entry edge 17 of a blade 12 and a direction in the direction of dimension.
  • ⁇ indicates the angle in the relative system.
  • the angle is given by ⁇ .
  • ⁇ describes an angle between an entry edge 17 of a blade 12 and a circumferential direction. Both angles ⁇ or ⁇ are inventively less than or equal to 45 °.
  • FIG. 8 shows a plan view of an impeller defining the angle a.
  • the angle a is measured between the circumferential direction, that is, a circular direction and a tangent at a point on the blade leading edge in the considered radius,
  • the angle at the inner radius R , a g is the angle ⁇ at the limit radius R g and a a the angle at the outer radius R a .

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)

Abstract

L'invention concerne une roue mobile (2) pour pompes centrifuges comprenant au moins une aube (12). La roue mobile (2) est utilisée pour transporter des fluides contenant des matières solides. L'angle a désigne un angle entre un bord d'entrée (17) de l'aube (12) et une direction périphérique. L'angle β désigne ici un angle entre un bord d'entrée (17) de l'aube (12) et une direction méridionale. L'angle a, β associé est réalisé inférieur à 90°, de préférence inférieur à 70°, notamment inférieur à 50°, en fonction de la vitesse dominante.
EP18750116.8A 2017-08-03 2018-07-24 Roue mobile pour pompe à eaux usées Pending EP3662164A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017213507.7A DE102017213507A1 (de) 2017-08-03 2017-08-03 Laufrad für Abwasserpumpe
PCT/EP2018/070025 WO2019025238A1 (fr) 2017-08-03 2018-07-24 Roue mobile pour pompe à eaux usées

Publications (1)

Publication Number Publication Date
EP3662164A1 true EP3662164A1 (fr) 2020-06-10

Family

ID=63108522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18750116.8A Pending EP3662164A1 (fr) 2017-08-03 2018-07-24 Roue mobile pour pompe à eaux usées

Country Status (8)

Country Link
US (1) US11603855B2 (fr)
EP (1) EP3662164A1 (fr)
CN (1) CN111201378B (fr)
AU (1) AU2018310551B2 (fr)
CA (1) CA3071480A1 (fr)
DE (1) DE102017213507A1 (fr)
SA (1) SA520411224B1 (fr)
WO (1) WO2019025238A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7276099B2 (ja) * 2019-11-26 2023-05-18 株式会社鶴見製作所 無閉塞ポンプ
FR3128976B1 (fr) * 2021-11-08 2023-11-24 Thales Sa Pompe Hydraulique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3692422A (en) * 1971-01-18 1972-09-19 Pierre Mengin Ets Shearing pump
CH633617A5 (de) * 1978-08-31 1982-12-15 Martin Staehle Kreiselpumpe mit einschaufel-laufrad zur foerderung von langfaserigen aufgeschwemmten feststoffen.
DE3365881D1 (en) * 1982-12-22 1986-10-09 Staehle Martin Centrifugal pump of the open channel rotor type
DE4015331A1 (de) 1990-05-12 1991-11-14 Klein Schanzlin & Becker Ag Einschaufelrad fuer kreiselpumpen
DE19717458A1 (de) * 1997-04-25 1998-10-29 Klein Schanzlin & Becker Ag Kreiselpumpe
DE102011007907B3 (de) * 2011-04-21 2012-06-21 Ksb Aktiengesellschaft Laufrad für Kreiselpumpen
WO2015000677A1 (fr) 2013-07-02 2015-01-08 Sulzer Pumpen Ag Rotor pour machine à écoulement centrifuge et machine à écoulement centrifuge

Also Published As

Publication number Publication date
US20200240428A1 (en) 2020-07-30
BR112020002141A2 (pt) 2020-08-04
CA3071480A1 (fr) 2019-02-07
RU2020104795A (ru) 2021-09-03
CN111201378B (zh) 2024-03-08
WO2019025238A1 (fr) 2019-02-07
RU2020104795A3 (fr) 2021-11-16
US11603855B2 (en) 2023-03-14
AU2018310551A1 (en) 2020-02-20
SA520411224B1 (ar) 2023-02-26
AU2018310551B2 (en) 2023-11-23
CN111201378A (zh) 2020-05-26
DE102017213507A1 (de) 2019-02-07

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