Mixed Flow Pumps You Tube

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    Mixed-flow pumps

    Mixed-flow pumps, as the name suggests, function as a compromise between radial and axial-flow pumps, the

    fluid experiences both radial acceleration and lift and exits the impeller somewhere between 090 degrees from

    the axial direction. As a consequence mixed-flow pumps operate at higher pressures than axial-flow pumps while

    delivering higher discharges than radial-flow pumps. The exit angle of the flow dictates the pressure head-

    discharge characteristic in relation to radial and mixed-flow.

    Mjeoviti protoka crpke

    Mjeoviti protoka pumpe, kao ime sugerira, funkcija kao kompromis izmeu radijalnim i aksijalnim protokompumpe, tekuina iskustva i radijalni ubrzanje i lift i izlazi rotora negdje izmeu 0-90 stupnjeva od aksijalnom

    smjeru. Kao posljedica mjeovitih protok crpke rade na viim tlakovima nego Aksijalne crpke, a isporuku vie od

    isputanja radijalnim protoka pumpe.Izlaz kut toka diktira tlaka glava-pranjenja obiljeje u odnosu na radijalne i

    mjeovite-toka.

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    What is the function of the Impeller?

    The impeller is the bladed member

    attached to the pump shaft (rotating

    assembly) and imparts the principle

    force to the fluid being pumped.

    The rotation of the impeller is what

    adds velocity energy to the pumped

    fluid. This velocity energy is later

    transformed to a pressure energy

    inside the casing near the outlet or

    discharge side.

    Impeller shapes can be classified

    as either radial flow (straight-vane),

    Francis-vane, mixed flow, or axial flow.

    These shapes are defined by the

    hydraulic geometry of the fluid

    as it flows through the impeller.

    One can see from the Impeller Shapes

    Chart (in Figure 6) below that there

    is actually a continuous change from

    the radial flow impeller, which develops

    pressure primarily by the action of

    centrifugal force, to the axial flow

    impeller, which develops most of its

    pressure by the propelling or lifting

    action of the vanes on the liquid.

    Another method of classifying

    impellers is by mechanical design.

    As such, impellers defined in this

    manner can be designed as open,

    semi-open, or closed. Both impeller

    shapes and mechanical designs are

    discussed in detail later in this lesson.

    Impellers are usually manufactured

    using one of two casting processes.

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    Sand casting uses a sand mold into

    which molten metal is poured and

    allowed to cool. Sand casted impellersare the most common and least

    expensive to produce. However, they

    very often leave a rough surface on

    the wetted areas of the impeller. This

    can lead to lower pump efficiencies.

    Investment casting uses a mold

    made from an extremely viscous

    (and expensive) waxy-like material.

    Molten metal is poured into this mold.

    As the metal cools, the mold melts

    leaving a smooth metal surface.

    Impellers made this way are usually

    more expensive to produce than sand

    casted impellers. However, because

    they leave a much smoother surface

    on the wetted areas of the impeller,

    higher pump efficiencies are often

    achievedto je funkcija rotora?

    Rotor je sjeiva lan

    privren na osovinu (rotirajui

    Skuptina) i daje naelo

    prisiliti na medij koji se pumpa.

    Rotacija rotora je ono

    dodaje brzine energiju crpi

    tekuine. Ova brzina je energija kasnije

    pretvara u energiju tlaka

    kuite u blizini utinice ili

    isprazniti stranu.

    Oblici radnog kola moe se svrstati

    kao ni radijalnog protoka (ravno-vjetrokaz),

    Franjo-vane, mjeoviti tok, ili aksijalni protok.

    Ovi oblici su definirani

    hidrauliki geometrija tekuine

    kao to tee kroz rotor.

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    One mogu vidjeti iz oblici radnog kola

    Grafikon (na slici 6) ispod koje se

    je zapravo kontinuirana promjena od

    radijalni tok rotor, koji se razvija

    tlak prvenstveno djelovanjem

    Centrifugalna sila, na aksijalne

    rotor, koji se razvija veina njegovih

    tlak pogon ili dizanje

    akcija od lopatice na tekuine.

    Drugi nain klasificiranja

    impeleri je mehanikom dizajnu.

    Kao takvi, rotori definiran u to

    nain moe biti dizajniran kao opena,

    polu-otvorene ili zatvorene. Oba rotora

    Oblici i mehanika dizajni su

    objanjeno u detalje kasnije u ovoj lekciji.

    Impeleri obino su proizvedeni

    koristei jednu od dvije lijevanje procesa.

    "Pijesak lijevanje" koristi pijesak kalup u

    koji rastaljenog metala je izlio iohladiti. Pijesak lijevanog impellersare najei i najmanje

    skup za proizvodnju. Meutim, oni

    vrlo esto ostavljaju grubu povrinu na

    su vlani podruja rotora. ovo

    moe dovesti do niih pumpe uinkovitosti.

    "Ulaganje lijevanje" koristi kalup

    izraena od izuzetno viskozan

    (i skupo) votana poput materijal.

    Rastaljenog metala je ulijeva u tom kalupu.

    Kao metal hladi, kalup topi

    ostavljajui glatku metalnu povrinu.

    Impeleri napravio ovaj nain su obino

    skuplji za proizvodnju od pijeska

    lijevanog impellers. Meutim, zbog

    oni ostaviti puno glae povrine

    na ovlai podruja rotora,

    vee uinkovitosti crpke su esto

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    postie

    Mixed flow impeller

    In a mixed flow impeller the vane

    surfaces have both an axial and

    radial component. Flow follows

    this mix of components with axial

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    and radial movement. Flow enters

    the pump axially and discharges

    in an axial and radial direction.

    A mixed flow impeller with more

    radial than axial flow is sometimes

    called a Francis -vane impeller.

    Mjeoviti toka rotora

    U mjeovitoj toka rotora vjetrokaz

    povrine imaju i aksilarno i

    radijalna komponenta. Protok slijedi

    ova mjeavina komponenti s aksijalnom

    i radijalni pokret. Protok ulazi

    pumpa aksijalno i isputanja

    u aksijalnom i radijalnom smjeru.

    Mijeani tok rotor s vie

    radijalno od aksijalnog toka je ponekad

    zove Franjo-vjetrokaz rotor.

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