產(chǎn)品詳情
D120-50*7,8SA-7B---------參數(shù)、價(jià)格、圖片、圖紙、 D120-50*7多級(jí)離心泵,8SA-7B中開泵,有好禮回饋,心動(dòng)不如行動(dòng)!
什么叫汽蝕余量?什么叫吸程?各自計(jì)量單位表示字母?
泵在工作時(shí)液體在葉輪的進(jìn)口處因一定真空壓力下會(huì)產(chǎn)生汽體,汽化的氣泡在液體質(zhì)點(diǎn)的撞擊運(yùn)動(dòng)下,對(duì)葉輪等金屬表面產(chǎn)生剝蝕,從而破壞葉輪等金屬,此時(shí)真空壓力叫汽化壓力,汽蝕余量是指在泵吸入口處單位重量液體所具有的超過(guò)汽化壓力的富余能量。單位用米標(biāo)注,用(npsh)r。吸程即為必需汽蝕余量δh:即泵允許吸液體的真空度,亦即泵允許的安裝高度,單位用米。吸程=標(biāo)準(zhǔn)大氣壓(10.33米)-汽蝕余量-安全量(0.5米)
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