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US20080199321A1 - Parabolic radial flow impeller with tilted or offset blades - Google Patents

Parabolic radial flow impeller with tilted or offset blades Download PDF

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Publication number
US20080199321A1
US20080199321A1 US11/707,089 US70708907A US2008199321A1 US 20080199321 A1 US20080199321 A1 US 20080199321A1 US 70708907 A US70708907 A US 70708907A US 2008199321 A1 US2008199321 A1 US 2008199321A1
Authority
US
United States
Prior art keywords
blades
disc
segment
center line
blade
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.)
Abandoned
Application number
US11/707,089
Other languages
English (en)
Inventor
Bernd Gigas
Kevin Logsdon
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.)
SPX Technologies Inc
Original Assignee
SPX Corp
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
Priority to US11/707,089 priority Critical patent/US20080199321A1/en
Application filed by SPX Corp filed Critical SPX Corp
Assigned to SPX CORPORATION reassignment SPX CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GIGAS, BERND, LOGSDON, KEVIN
Assigned to SPX CORPORATION reassignment SPX CORPORATION CORRECTION TO REEL/FRAME 018990/0572 Assignors: GIGAS, BERND, LOGSDON, KEVIN
Priority to CA002620485A priority patent/CA2620485A1/en
Priority to GB0802308A priority patent/GB2446924A/en
Priority to ZA200801400A priority patent/ZA200801400B/en
Priority to DE102008008507A priority patent/DE102008008507A1/de
Priority to IT000215A priority patent/ITMI20080215A1/it
Priority to AU2008200755A priority patent/AU2008200755A1/en
Priority to FR0800838A priority patent/FR2912669A1/fr
Priority to CNA2008100093265A priority patent/CN101306333A/zh
Publication of US20080199321A1 publication Critical patent/US20080199321A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/115—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis
    • B01F27/1152—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis with separate elements other than discs fixed on the discs, e.g. vanes fixed on the discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/115—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis
    • 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
    • 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
    • F04D29/30—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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • 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

Definitions

  • the present invention pertains generally to the field of mixers and mixing devices and methods.
  • the invention relates to radial flow impellers used in such mixing systems and methods.
  • a vessel which has a rotating shaft extending therein that is driven by a drive system typically external to the vessel.
  • the vessel forms a containment chamber for material that is to be mixed, agitated or otherwise to have energy imparted into it.
  • Impellers or impeller assemblies are mounted to rotate with the rotating driven shaft.
  • the impellers typically extend radially outwardly from the shaft for some distance towards the outside walls of the vessel.
  • the impellers in some cases may be paddle type elements or blade elements that may extend directly outwardly from a hub on the shaft, or may extend outwardly from a disc mounted to the shaft or may be a single disc having features disposed around the circumference of the disc.
  • the material to be mixed or otherwise treated is simply loaded into the vessel and then the impellers are activated.
  • the gas sparger is generally central so that the bubbles rise up and interact with the moving impellers.
  • impellers Two general types of impellers are known for many mixer systems.
  • One type of impeller is a so-called axial flow impeller.
  • These axial flow impellers which often take the shape of simply angled plates, or in other cases take the shape of a propeller, or winged shaped blade, move the material in a generally axial direction either upwards or downwards in the vessel parallel to the direction of the shaft elongation.
  • Radial flow impellers often take the shape of a flat plate or some other geometric shape, and typically push the material outwardly away from the impeller region using centrifugal force, thus creating a radial flow vector, generally outward, in the region outside of the impeller location.
  • One type of radial flow impeller utilizes a central disc having a number of circumferentially spaced blades or paddle portions extending out from the disc so that they partially overlap the disc and partially extend outward from the disc.
  • one commonly used type of blade has a generally parabolic cross section with two leading edges spanning back towards a single trailing vortex.
  • these blades have generally been mounted with the center line of the parabola being located co-planar with the plane in which the disc lives.
  • the combination of the disc and the blades is symmetrical with respect to the plane in which the disc lies. That is, the location of the blades from the disc is a mirror image of the portion of the blades below the disc.
  • an impeller assembly has a generally planar disc oriented in a first plane and having a circular outer edge; a plurality of blades mounted to the disc and extending beyond the edge of the disc, with the blades in cross-section having a shape that is substantially symmetrical along a center line and having a first segment and a second segment disposed on opposite sides of the center line, with one segment being symmetrical with at least a portion of the other segment, and with the blades mounted so that the respective center line of each blade is at an angle relative to the first plane in which the disc lies.
  • an impeller assembly for use with a shaft has a generally planar central mounting means for mounting to the shaft; and a plurality of blades mounted to the mounting means and extending radially outward beyond the mounting means with the blades in cross-section having a shape that is substantially symmetrical about a center line and having a first segment and a second segment disposed on opposite sides of the center line, with one segment being symmetrical with at least a portion of the other segment, and with the blades mounted so that the respective center line of each blade is at an angle relative to a plane in which the mounting means lies.
  • a mounting method includes rotating a shaft to drive an impeller assembly that comprises a generally planar disc; and a plurality of blades mounted to the disc and extending beyond the disc, with the blades in cross-section having a shape that has a first segment and a second segment disposed on opposite sides of the center line, with one segment being symmetrical with at least a portion of the other segment, and with the blades mounted so that the respective center line of each blade is at an angle relative to a plane in which the disc lies.
  • an impeller assembly has a generally planar disc oriented in a first plane and having a circular outer edge; and a plurality of blades mounted to the disc and extending beyond the edge of the disc, with the blades in cross-section having a shape that is substantially symmetrical along a center line and having a first segment and a second segment disposed on opposite sides of the center line, with one segment being symmetrical with at least a portion of the other segment, and with the blades mounted so that the respective center line of each blade is parallel to the first plane in which the disc lies, and the center line of each blade is offset from the first plane in which the disc lies.
  • an impeller assembly for use with a shaft has a generally planar central mounting means for mounting to the shaft; and a plurality of blades mounted to the mounting means and extending radially outward beyond the mounting means with the blades in cross-section having a shape that is substantially symmetrical about a center line and having a first segment and a second segment disposed on opposite sides of the center line, with one segment being symmetrical with at least a portion of the other segment, and with the blades mounted so that the respective center line of each blade is parallel to a plane in which the mounting means lies, and the center line is offset from the first plane in which the disc lies.
  • a mounting method includes rotating a shaft to drive an impeller assembly that comprises: a generally planar disc; and a plurality of blades mounted to the disc and extending beyond the disc, with the blades in cross-section having a shape that has a first segment and a second segment disposed on opposite sides of the center line, with one segment being symmetrical with at least a portion of the other segment, and with the blades mounted so that the respective center line of each blade is at an angle relative to a plane in which the disc lies.
  • FIG. 1 is a perspective view of an impeller assembly according to a first embodiment.
  • FIG. 2 is an end cutaway view of a portion of the impeller assembly of FIG. 1 .
  • FIG. 3 is a perspective view of an impeller assembly according to a second embodiment.
  • FIG. 4 is an end cutaway view of a portion of the impeller of FIG. 3 .
  • FIGS. 1 and 2 A first preferred embodiment of a radial flow impeller assembly mounted or a shaft is shown in FIGS. 1 and 2 .
  • the impeller assembly 10 includes a radially extending disc 12 having an outer peripheral region 14 .
  • a plurality of individual blades 16 are provided which each have an upper segment 18 and a lower segment 20 .
  • the upper segment 18 has a leading edge 22 and the lower segment 20 has a leading edge 23 .
  • the segments converge at a rear vertex 24 .
  • a hub 26 mounts the impeller assembly 10 to a shaft 28 .
  • the upper segment 18 and lower segment 20 are symmetrical with respect to each other about an imaginary center line CL 1 , which is indicated by dotted lines.
  • the blade 16 is mounted to overlap with the outer portion of the disc 12 so that its imaginary center line CL 1 is at an angle (alpha) a with respect to the plane in which the disc 12 lies.
  • This angled orientation of the center line CL 1 of the parabolic blades 16 with respect to the plane of the disc 12 as described in FIG. 2 provides several advantages in some applications. For example, where gas is being sparged from beneath the impeller assembly 10 , because of the increased volumetric area inside the parabola lower segment 20 (compared to if the angle ⁇ was zero), greater gas handling can be achieved by the angled orientation. That is, greater gas handling is achieved prior to reaching the impeller gas handling flood condition in some situations. This is due at least in part to the larger enclosed region between the lower impeller segment 20 and the bottom of the disc 12 , so that more gas can be entrained.
  • the tilting of the blade 16 causes the upper region 22 to reach forward (that is the entire blade faces downward to some extent), and so gas also tends to be entrained under the lower surface of the upper segment 18 , which may increase one or both of the residence time or the total volume of gas that is temporarily contained by the impeller 16 .
  • FIGS. 3 and 4 a second embodiment is depicted.
  • the blade 16 is mounted to the disc 12 so that its center line CL 2 is at least substantially parallel, or completely parallel, with the plane in which disc 12 lies, but the center line CL 2 is also located offset a distance from the plane of the disc 12 .
  • the center line CL 2 is offset below the plane of the disc 12 by an offset distance D.
  • this offset also provides a greater volumetric region in the area bounded by the underside of the disc 12 and the upper inside of the lower segment 20 , as well as a portion 22 ′ which is a region of the upper segment of the parabola that is disposed below the plane of the disc 12 .
  • This arrangement also has a portion 22 ′′ of the upper segment of the parabola that is disposed above the disc 12 .
  • this embodiment also can provide benefits in terms of larger gas handling compared to a prior system where the parabolic blade is mounted with its center line co-linear with the plane of the disc 12 .
  • FIGS. 2 and 4 Two exemplary embodiments are described and illustrated in FIGS. 2 and 4 , respectively.
  • the vertex of the parabola is located on a center line and the vertex of the parabola in the center line intersect with the plane of the disc.
  • the center line of the parabola is parallel with the plane of the disc, but is offset by a distance D.
  • the embodiment of FIG. 4 could also have the parabola tilted downwardly somewhat similar to FIG. 2 , so that the center line intersects with the plane of the disc but not at the point of the vertex.
  • impellers could be mounted to the shaft via a different type of hub, for example a disc having spokes rather than being solid, or a plurality of individual arms extending from a hub or the shaft itself.
  • the blades themselves may be mounted directly to a hub or to the shaft and extend radially therefrom.
  • each blade could be made of two flat pieces meeting at a corner vertex.
  • an embodiment similar to FIG. 2 being tilted downwardly, or an embodiment similar to FIG. 4 offset downwardly can also be realized.
  • the cross section of the blades does not have to be symmetrical with respect to the center line.
  • either the upper or lower legs of the parabola may be longer or shorter than each other.
  • one of the upper or lower legs could have a cross sectional shape that is different than the opposite upper or lower leg.
  • the blades are shown as being solid items, the blades may be slotted or have ports extending therethrough at similar locations.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Optical Elements Other Than Lenses (AREA)
US11/707,089 2007-02-16 2007-02-16 Parabolic radial flow impeller with tilted or offset blades Abandoned US20080199321A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US11/707,089 US20080199321A1 (en) 2007-02-16 2007-02-16 Parabolic radial flow impeller with tilted or offset blades
CA002620485A CA2620485A1 (en) 2007-02-16 2008-02-07 Parabolic radial flow impeller
GB0802308A GB2446924A (en) 2007-02-16 2008-02-07 Parabolic Radial Flow Impeller
ZA200801400A ZA200801400B (en) 2007-02-16 2008-02-11 Parabolic radial flow impeller
DE102008008507A DE102008008507A1 (de) 2007-02-16 2008-02-11 Parabolische Radial-Laufräder
IT000215A ITMI20080215A1 (it) 2007-02-16 2008-02-12 Girante parabolico a flusso radiale
FR0800838A FR2912669A1 (fr) 2007-02-16 2008-02-15 Roues a aubes
AU2008200755A AU2008200755A1 (en) 2007-02-16 2008-02-15 Parabolic radial flow impeller
CNA2008100093265A CN101306333A (zh) 2007-02-16 2008-02-18 抛物线径向流推动器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/707,089 US20080199321A1 (en) 2007-02-16 2007-02-16 Parabolic radial flow impeller with tilted or offset blades

Publications (1)

Publication Number Publication Date
US20080199321A1 true US20080199321A1 (en) 2008-08-21

Family

ID=39204436

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/707,089 Abandoned US20080199321A1 (en) 2007-02-16 2007-02-16 Parabolic radial flow impeller with tilted or offset blades

Country Status (9)

Country Link
US (1) US20080199321A1 (de)
CN (1) CN101306333A (de)
AU (1) AU2008200755A1 (de)
CA (1) CA2620485A1 (de)
DE (1) DE102008008507A1 (de)
FR (1) FR2912669A1 (de)
GB (1) GB2446924A (de)
IT (1) ITMI20080215A1 (de)
ZA (1) ZA200801400B (de)

Cited By (12)

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US20090017743A1 (en) * 2007-07-11 2009-01-15 Puthalath Koroth Raghuprasad Windshield saver
US20090126612A1 (en) * 2007-11-21 2009-05-21 Hydreau Limited Waterwheel
US20090323464A1 (en) * 2008-06-27 2009-12-31 William Ray Mclntire Horizontal-flow hydration apparatus
US20130136617A1 (en) * 2011-11-24 2013-05-30 Li Wang Mixing impeller having channel-shaped vanes
WO2015098290A1 (ja) * 2013-12-26 2015-07-02 住友重機械プロセス機器株式会社 撹拌翼及び撹拌装置
JP2016539796A (ja) * 2013-12-11 2016-12-22 インベント ウムウェルト− ウント フェルファーレンステヒニック アーゲー 貯水体中の廃水を循環させる撹拌体および装置
US10022683B2 (en) 2015-02-27 2018-07-17 EKATO Rühr- und Mischtechnik GmbH Stirring device
CN108775142A (zh) * 2018-06-27 2018-11-09 山东亲橙里教学用品有限公司 一种建筑专用脚手架
CN109267828A (zh) * 2018-12-07 2019-01-25 湖北科技学院 一种一对多电子钥匙及与之配合的防盗锁
US10618018B2 (en) 2016-05-25 2020-04-14 Spx Flow, Inc. Low wear radial flow impeller device and system
CN114653117A (zh) * 2022-05-18 2022-06-24 大连海事大学 一种海水过滤器
CN115501371A (zh) * 2021-06-22 2022-12-23 金赞洙 香烛加热器

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EP2782664A4 (de) * 2011-11-24 2015-07-15 Li Wang Mischimpeller mit rinnenförmigen schaufeln
RU2522141C1 (ru) * 2013-02-11 2014-07-10 Андрей Геннадьевич Корепанов Рабочее колесо ступени погружного центробежного насоса
CN105854664B (zh) * 2016-04-27 2017-12-29 江南大学 一种装配扇环型凹面叶片的气液分散搅拌器装置
CN106268579B (zh) * 2016-08-04 2018-02-23 镇江东方生物工程设备技术有限责任公司 一种气液分散搅拌装置
CN108097092A (zh) * 2017-12-05 2018-06-01 芜湖市诺康生物科技有限公司 一种液体搅拌装置

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FR2912669A1 (fr) 2008-08-22
DE102008008507A1 (de) 2008-08-21
CN101306333A (zh) 2008-11-19
GB2446924A (en) 2008-08-27
ITMI20080215A1 (it) 2008-08-17
AU2008200755A1 (en) 2008-09-04
ZA200801400B (en) 2009-01-28
GB0802308D0 (en) 2008-03-12

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