與普通離心泵相比，發(fā)動(dòng)機(jī)冷卻水泵由于受溫度、工況、轉(zhuǎn)速變化的影響，更容易發(fā)生汽蝕汽蝕發(fā)生時(shí)伴隨有振動(dòng)和噪聲，泵的揚(yáng)程、效率等性能急速下降，*在汽蝕工況下運(yùn)行，葉輪將受到氣泡潰滅時(shí)的強(qiáng)力沖擊而侵蝕，甚至穿孔損壞。發(fā)動(dòng)機(jī)冷卻水泵葉片表面的蜂窩狀坑點(diǎn)、蝸殼隔舌附近的凹坑都是常見(jiàn)的汽蝕破壞。
上海祥樹(shù)FLENDERZAPEX ZNN156
上海祥樹(shù)FLENDERZAPEX ZNN156
上海祥樹(shù)FLENDERZAPEX ZNN156
此外，發(fā)動(dòng)機(jī)冷卻水泵的汽蝕還將會(huì)腐蝕破壞過(guò)流部件，加速部件失效等。發(fā)動(dòng)機(jī)冷卻水泵汽蝕破壞已成為縮短泵使用壽命、產(chǎn)生振動(dòng)噪聲等危害的重要因素，嚴(yán)重影響著汽車?yán)鋮s系統(tǒng)的正常工作。因此，提高其抗汽蝕性能是保證冷卻系統(tǒng)可靠運(yùn)行首先需要考慮的問(wèn)題。
發(fā)動(dòng)機(jī)冷卻水泵惡劣的工作環(huán)境，使得泵的可靠性和汽蝕破壞問(wèn)題尤其突出，嚴(yán)重影響著冷卻系統(tǒng)的安全、穩(wěn)定、可靠地運(yùn)行。探討如何提高發(fā)動(dòng)機(jī)冷卻水泵的可靠性、研究汽蝕機(jī)理對(duì)發(fā)動(dòng)機(jī)冷卻系統(tǒng)的發(fā)展意義重大 。
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