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AF泡沫泵抽送混合物時允許吸上高度
如果知道泵抽送清水時(在相同流量下) 允許吸上高度H.. am-o,那么我們可以求出抽送固液混合物時允許靜上高度H. non.r.
根據(jù)式(3-2- 18)，得到
由此得到
允許吸上真空高度為
式中cbc——固液混合物在安裝真空表處的速度。
列一個例子，計算泵抽送密度1200kg/m3的固液混合物時允許吸上真空高度，流量為3000m3/h 泵吸入短管直徑Dbc=500mm，葉輪入口處的速度為 吸入管中的速度頭為 泵抽送清水時允許靜吸上高度為 泵的允許汽蝕余量為 大氣壓力和液體在給在給定溫度下飽和蒸汽壓力 泵抽送固液混合物時允許吸上高度為 注意 Permissible suction height for pumping mixtures If we know that when pumping clean water (at the same flow rate) the height of H. am-o is allowed, then we can calculate the allowable static height of H. non. r when pumping solid-liquid mixture. According to formula (3-2-18), we get Thus get The allowable vacuum height is The velocity of cbc-solid-liquid mixture at the installation of vacuum gauge. For example, the vacuum height is allowed to be sucked when pumping a solid-liquid mixture with a density of 1200kg/m3, the flow rate is 3000m3/h, and the vacuum height is allowed to be sucked H=7.2m. Pump suction tube diameter Dbc = 500 mm, impeller inlet speed is The velocity head in the suction tube is When pumping clean water, the upper allowable static suction height is 0. Permissible cavitation allowance of pump Atmospheric pressure and liquid saturated vapor pressure at a given temperature. For the conditions of clear water and standard atmosphere, (0-)/& e) > 10m (in formula, P is the density of water), we get When pumping solid-liquid mixture, the allowable suction height is Note that H.um. = 6.28m. When pumping clean water, the allowable suction height will decrease with the increase of density.
對于清水和標(biāo)準(zhǔn)大氣的條件
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