RADNI STROJEVI CRPKE, KOMPRESORI, VENTILATORI
Transcript of RADNI STROJEVI CRPKE, KOMPRESORI, VENTILATORI
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RADNI STROJEVI
CRPKE, KOMPRESORI,
VENTILATORI
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CRPKE
Namjena:
Crpke su radni strojevi koji služe crpljenju i transportu tekućina s jednog mjesta na drugo, odnosno s nižeg na viši nivo.
Podjela crpki:
1. Prema načinu rada:
- crpke neprekinutog (kontinuiranog) djelovanja
- crpke prekidnog (diskontinuiranog) djelovanja
2. Prema konstrukciji
- centrifugalne
- klipne i stapne
- membranske
- krilne
- vijčane
- zupčaste
- …itd.
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Zupčasta crpka
Crpka kontinuiranog
djelovanja.
Primjena u motorima
SUI – crpka za ulje
uređaja za
podmazivanje, kod
traktora – crpka
hidraulika itd.
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CENTRIFUGALNA CRPKA
Crpka kontinuiranog
djelovanja
Služi za opskrbu
vodom na farmama, za
hlađenje motora SUI
rashladnom tekućinom
itd.
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KLIPNA CRPKA
Crpka prekidnog
(diskontinuiranog)
djelovanja
Služi za snabdijevanje
gorivom motora SUI, za
rad prskalica itd.
1-radna crpka
2-radna crpka
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1-radna klipna crpka
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2-radna klipna crpka
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MEMBRANSKA CRPKA
Crpka prekidnog
(diskontinuiranog)
djelovanja
Služi kao crpka za
gorivo motora SUI, za
rad prskalica itd.
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KLIPNO-MEMBRANSKA CRPKA
Služi za rad prskalica
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CRPNA STANICA ( 19. STOLJEĆE)
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Karakteristike crpke
Snaga
102
manQ HP kW
= specifična težina tekućine (kg/l)
Q = kapacitet crpke (l/s)
Hman = manometarska visina (m V.S.)
= stupanj korisnog djelovanja crpke
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Kapacitet 1-radne stapne crpke
V = volumen cilindra crpke (l)
D = promjer cilindra (dm)
s = stapaj (dm)
n = broj okretaja pogonskog vratila (s-1)
= stupanj korisnog djelovanja crpke
2
/4
DQ V n s n l s
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Kapacitet 2-radne stapne crpke
2
2 /4
DQ s n l s
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VENTILATORI
Radni strojevi namijenjeni dobavi velikih
količina zraka pod malim pritiskom (izmjeni
zraka u prostorijama, hlađenju, grijanju i sl.).
Ventilatori mogu biti:
- aksijalni (p = do 30 mm V.S.) za veće
količine dobave zraka
- radijalni (p = do 500 mm V.S.) za manje
količine dobave zraka
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AKSIJALNI VENTILATORI
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AKSIJALNI VENTILATOR
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Aksijalni ventilator
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Radijalni (centrifugalni) ventilator
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CENTRIFUGALNI VENTILATOR
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Centrifugalni ventilator
Izvedbe lopatica
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RADIJALNI VENTILATORI
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Radijalni (centrifugalni) ventilator
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KOMPRESORI
Radni strojevi namijenjeni komprimiranju
plinova.
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KLIPNI KOMPRESOR
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SPIRALNI (VIJČANI) KOMPRESOR
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Aksijalni kompresor
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Turbo kompresor za prednabijanje zraka
motora SUI
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Hidraulična dizalica
Pascalov zakon – pritisak fluida u posudi prenosi
se jednako na sve stijenke (hidrostatski pritisak)
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Hidrostatski pritisak
p =
(ro) – gustoća fluida
g – gravitacija
h – visina stupca fluida
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Princip spojenih posuda