EP3325810A1 - Centrifugal pump blade profile - Google Patents
Centrifugal pump blade profileInfo
- Publication number
- EP3325810A1 EP3325810A1 EP16731181.0A EP16731181A EP3325810A1 EP 3325810 A1 EP3325810 A1 EP 3325810A1 EP 16731181 A EP16731181 A EP 16731181A EP 3325810 A1 EP3325810 A1 EP 3325810A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- profile
- blade
- centrifugal pump
- additional
- section
- 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
Links
- 238000000034 method Methods 0.000 claims abstract description 18
- UJCHIZDEQZMODR-BYPYZUCNSA-N (2r)-2-acetamido-3-sulfanylpropanamide Chemical compound CC(=O)N[C@@H](CS)C(N)=O UJCHIZDEQZMODR-BYPYZUCNSA-N 0.000 claims description 5
- 241001669680 Dormitator maculatus Species 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims 1
- 239000007787 solid Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000835 fiber Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or 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
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2238—Special flow patterns
-
- 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
-
- 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
- F04D29/2277—Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point
-
- 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
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
-
- 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
-
- 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
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/301—Cross-sectional characteristics
-
- 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
- F05D2250/00—Geometry
- F05D2250/70—Shape
- F05D2250/72—Shape symmetric
Definitions
- the invention relates to a centrifugal pump with an impeller having at least one blade and a method for designing the profile of a blade of the impeller of a centrifugal pump.
- the invention preferably relates to centrifugal pumps which are used for conveying solids-containing media.
- Channel wheels are open or closed wheels with a reduced number of blades. 1, 2 or 3 blades in radial and semi-axial impellers have proven successful. Their uses are silted or solids loaded liquids.
- 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 made by a casting process forms between a front cover plate and a rear cover plate a channel whose cross-section decreases from the inlet of the Einschaufelrades to the outlet.
- the suction side is at the first 180 ° Drehwinkeis a concentric with the axis of rotation arranged semicircle.
- the pick-up impeller is designed to reduce the occurrence of cavitations.
- impellers with multiple blades are characterized by higher efficiency.
- special requirements are also placed on such wheels with regard to the prevention of deposits of solid constituents in the conveying path.
- special measures must be taken to avoid blockages.
- DE 88 00 074 U1 a pump impeller is described for a centrifugal pump whose Schaufefeintrittswinkel is between 0 ° and 40 °.
- the impeller blades are designed so that the occurrence of cavitation is reduced and yet a good absorbency is ensured in the overload range.
- the flow lines of the rotor blades have a section in which the blade angle increases up to 25 °.
- centrifugal pumps with high specific speeds are being used more and more often.
- this causes the stagnation point of a blade inflow to migrate to the pressure side of the blades, in particular under partial load operation.
- the inlet edges of the blades are flowed around from the pressure side to the suction side.
- the stagnation point located on the pressure side presses fibers located in the wastewater onto the surface of the blades.
- DE 10 2011 007 907 B3 relates to an impeller of a centrifugal pump for conveying solids-containing media.
- the impeller has at least two blades.
- the blade entry angle is less than 0 °.
- the blade angle increases in a first section until it reaches a value of 0 °. In a second section, a further increase takes place until a maximum value is reached. In a third section, the blade angle drops off again.
- the ball passage, the steepness of the characteristic curve, the cavitation properties and the blade load are particularly related to wastewater wheels. Unlike pure water applications, the ball passage plays a key role.
- the blades should have a large loop.
- the shape of the curve is determined by the grading angle of the blades.
- the angles at the inlet and outlet essentially determine the adaptation of the design to the desired operating point or change the load distribution (pressure difference blade suction to blade pressure side) along the blade contour.
- the load on the blade is increased to a very great extent up to the narrowest cross section defining the ball passage.
- the ball passage is the lower the stowage angle.
- the lower the exit angle the higher the load up to the narrowest cross section.
- the increased load leads to increased NPSH values and, in the unfavorable case, to flow separation and thus to a loss of efficiency.
- the blade has a profile that results from the superposition of a symmetrical profile with at least one additional profile and a skeleton line whose blade entry angle is less than 0 °.
- a profile ensures a uniform load on the entire Schaufelfikiee. The load or circulation is limited to the respective minimum size. As a result, separation or cavitation areas are prevented on the suction side.
- it is possible to intentionally avoid dead water or backflow regions on the pressure side.
- a skeleton line also profile center line or curvature line or curvature line
- a skeleton line refers to the connecting line inscribed in a profile circle centers. From the nose circle center point to the profile nose, the skeleton line runs straight. The course of the skeleton line essentially determines the flow properties. Important geometric parameters of the skeleton lines are, in addition to the blade angle, the wrap angle.
- the skeleton line which is used for superimposition, preferably has a scrolling gradient, in which initially the negative blade entry angle increases until it reaches a value of zero. In a second section, the bucket angle then rises to a maximum value and finally drops off again in a third section. In a preferred embodiment of the invention, the blade angle of the skeleton line remains constant in a subsequent fourth section. Up to the narrowest cross-section, a region increasing with decreasing number of blades is available, in which the load (circulation) can be made variable. According to the invention this load variation is made with additional profiles. According to the invention, the profiles in each blade calculation step are varied in length and thickness separately on the suction and pressure sides in order to reduce the load and thus avoid cavitation or detachment on the suction side and dead water or backflow on the pressure side.
- the required profile is built up from a characteristic skeleton line, a symmetrical basic profile and additional profiles on the suction side as well as additional profiles on the pressure side.
- the symmetrical base profile is preferably a DC profile with an elliptical profile nose.
- the additional profiles can be provided on the basis of catalog profiles. For example, NACA profiles (National Advisory Committee for Aeronautics). The superimposition takes place in a just imaging system of the Kaplan method see.
- the profile shapes according to the invention result from the superimposition of the characteristic skeleton line, which has a negative blade entry angle, together with a thickness distribution or a profile drop.
- the finished profile is then positioned under the necessary angle of attack ß m in a conformal figure.
- the overall blade is generated by conformal mapping of the one blade sections present in the plane into the flood surfaces present as axisymmetric surfaces of revolution.
- the provision of the blade profile is preferably carried out by superposition of an asymmetric profile drop and the characteristic skeleton line.
- FIG. 1 shows an axial section through an impeller
- FIG. 2 shows variable droplets on three streamlines as plan view
- FIG. 3 shows a meridian section
- FIG. 4a shows a profile of the vane angle
- FIG. 4b shows a conformal image of the skeleton line
- FIG. 5 shows a variable range for a thickness variation
- FIG. 6 shows a profile structure in the conformal image before superposition with the skeleton line
- FIG. 7 shows an overlay profile using the example of a NACA professional
- Figure 8 shows variable drops on three streamlines in the conformal image
- Figure 9 is a perspective view of an impeller according to the invention.
- FIG. 1 shows an axial section through a radial impeller.
- the permeated with solid admixtures liquid enters the suction port 1 of the impeller.
- the blades 4 arranged between cover disk 2 and support disk 3 accelerate the liquid.
- the liquid flows radially outward from the axis of rotation 5.
- the impeller is operated in particular at specific speeds of more than 70 1 / min.
- a low ratio of blade outlet radius R 2 to blade inlet radius Ri proves to be particularly favorable.
- the ratio of blade outlet radius R2 to blade inlet radius R1 is less than 1.3.
- FIG. 3 shows the three streamlines as a meridian section.
- FIG. 4b shows a conformal image of the skeleton line.
- the wrap angle ⁇ is plotted.
- the blade angle ß of the skeleton lines is plotted.
- the blade entry angle ⁇ i is less than 0 °.
- the blade angle ß increases steadily until it reaches a value of 0 °.
- a steady drive until the blade angle ß reaches a maximum value.
- the gradient of the increase of the blade angle ⁇ is the same in the first section 6 and in the second section 7.
- the blade angle ß reaches its maximum value at the inflection point of the skeg line.
- the blade angle ⁇ drops steadily until it reaches the value of the blade angle ⁇ 2 .
- the blade angle ⁇ remains constant at the value of the blade outlet angle ⁇ 2 .
- the conformal image of the skeleton line shows that, starting from the blade radius Ri, the radius initially drops to a minimum value R m m and then increases further up to the value of the blade exit radius R 2 .
- Figure 5 shows a variable range for a thickness variation. Up to a narrowest section, there is an increasing range with decreasing number of blades, in which the load (circulation) can be made variable. This variable range is shown as ⁇ in Figure 5.
- the stagger angle ß m is drawn.
- the loading variation is carried out with additional profiles, which are varied in length and thickness separately on the suction and pressure side in each blade calculation step, in order to limit the load (circulation) to the respective minimum dimensions and thus detachment or cavitation zones (on the suction side). page) and dead water or remindström whiche (on the pressure side) to avoid.
- FIG. 6 shows a profile structure in the conformal image before superposition with the skeleton line with a base profile 10 of the pressure side and a base profile 11 of the suction side.
- the sought profile builds up.
- the additional profiles 12, 13 can be provided on the basis of catalog profiles, for example an overlay profile (NACA 65010) shown in FIG.
- the superimposition takes place in a planar imaging system according to the Kaplan method.
- FIG. 9 The result of the design is shown in FIG. 9 on the basis of a double-shell sewage frame.
- the method can be used for open or closed wheels.
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
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015213451.2A DE102015213451B4 (en) | 2015-07-17 | 2015-07-17 | Centrifugal pump blade profile |
PCT/EP2016/064605 WO2017012825A1 (en) | 2015-07-17 | 2016-06-23 | Centrifugal pump blade profile |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3325810A1 true EP3325810A1 (en) | 2018-05-30 |
Family
ID=56178377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16731181.0A Pending EP3325810A1 (en) | 2015-07-17 | 2016-06-23 | Centrifugal pump blade profile |
Country Status (4)
Country | Link |
---|---|
US (1) | US20180209447A1 (en) |
EP (1) | EP3325810A1 (en) |
DE (1) | DE102015213451B4 (en) |
WO (1) | WO2017012825A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2018044B1 (en) * | 2016-12-22 | 2018-06-29 | Ihc Holland Ie Bv | Impeller with rotor blades for centrifugal pump |
DE102019005469A1 (en) * | 2019-08-05 | 2021-02-11 | KSB SE & Co. KGaA | Closed centrifugal pump channel impeller for liquids with abrasive or erosive additions |
DE102021118564A1 (en) | 2021-07-19 | 2023-01-19 | KSB SE & Co. KGaA | Blade arrangement with micro blades |
KR102416990B1 (en) * | 2022-01-24 | 2022-07-06 | 주식회사 일렉트리코 | Washing ball circulation pump of condenser for power plant |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4063849A (en) * | 1975-02-12 | 1977-12-20 | Modianos Doan D | Non-clogging, centrifugal, coaxial discharge pump |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59192898A (en) * | 1983-04-15 | 1984-11-01 | Hitachi Zosen Corp | Centrifugal impeller |
CH672532A5 (en) | 1987-01-29 | 1989-11-30 | Sulzer Ag | Impeller for centrifugal pump - has blade angle profile chosen to minimise danger of cavitation |
DE4015331A1 (en) | 1990-05-12 | 1991-11-14 | Klein Schanzlin & Becker Ag | PADDLE WHEEL FOR CENTRIFUGAL PUMPS |
DE102010027588A1 (en) * | 2010-07-19 | 2012-01-19 | Rolls-Royce Deutschland Ltd & Co Kg | Fan-Nachleitradschaufel a turbofan engine |
DE102011007907B3 (en) | 2011-04-21 | 2012-06-21 | Ksb Aktiengesellschaft | Impeller for centrifugal pumps |
EP2711557B1 (en) * | 2012-09-20 | 2019-10-02 | Sulzer Management AG | An impeller for a centrifugal pump |
-
2015
- 2015-07-17 DE DE102015213451.2A patent/DE102015213451B4/en active Active
-
2016
- 2016-06-23 WO PCT/EP2016/064605 patent/WO2017012825A1/en active Application Filing
- 2016-06-23 US US15/745,635 patent/US20180209447A1/en not_active Abandoned
- 2016-06-23 EP EP16731181.0A patent/EP3325810A1/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4063849A (en) * | 1975-02-12 | 1977-12-20 | Modianos Doan D | Non-clogging, centrifugal, coaxial discharge pump |
Also Published As
Publication number | Publication date |
---|---|
WO2017012825A1 (en) | 2017-01-26 |
DE102015213451A1 (en) | 2017-01-19 |
US20180209447A1 (en) | 2018-07-26 |
DE102015213451B4 (en) | 2024-02-29 |
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