mixed flow pumps you tube
TRANSCRIPT
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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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