PVQ32B2RSE1S20C14D11威格士柱塞泵
武穴黎翔機電設(shè)備有限公司專業(yè)經(jīng)營美國威格士VICKERS,具體產(chǎn)品有威格士電磁閥...威格士換向閥....威格士減壓閥...威格士節(jié)流閥...威格士流量控制閥...威格士溢流閥...威格士葉片泵...威格士柱塞泵... 威格士全系列:大量現(xiàn)貨庫存,歡迎來電咨詢。
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美國VICKERS柱塞泵內(nèi)設(shè)有由液氦或制冷機冷卻到極低溫度的冷板。它使氣體凝結(jié),并保持凝結(jié)物的蒸汽壓力低于泵的極限壓力,從而達(dá)到抽氣作用。低溫抽氣的主要作用是低溫冷凝、低溫吸附和低溫捕集。①低溫冷凝:氣體分子冷凝在冷板表面上或冷凝在已冷凝的氣體層上,其平衡壓力基本上等于冷凝物的蒸氣壓。抽空氣時,冷板溫度必須低于 25K;抽氫時,冷板溫度更低。低溫冷凝抽氣冷凝層厚度可達(dá)10毫米左右。②低溫吸附:氣體分子以一個單分子層厚 (10-8厘米數(shù)量級)被吸附到涂在冷板上的吸附劑表面上。吸附的平衡壓力比相同溫度下的蒸氣壓力低得多。如在 20K時氫的蒸氣壓力等于大氣壓力,用 20K的活性炭吸氫時吸附平衡壓力則低于10-8 帕。這樣就可能在較高溫度下通過低溫吸附來進行抽氣。③低溫捕集:在抽氣溫度下不能冷凝的氣體分子,被不斷增長的可冷凝氣體層埋葬和吸附。
美國VICKERS柱塞泵可以認(rèn)為是變量機構(gòu)的控制不佳造成,如異物進入變量機構(gòu),在控制活塞上劃出階痕、磨痕、傷痕等,造成控制活塞運動不穩(wěn)定。由于放大器能量不足或零件損壞、含有彈簧的控制活塞的阻尼器效能差,都會造成控制活塞運動不穩(wěn)定。流量不穩(wěn)定又往往伴隨著壓力波動。這類故障一般要拆開液壓泵,更換受損零部件,加大阻尼,提高彈簧剛度和控制壓力等。
美國VICKERS柱塞泵的斜盤傾角為零時稱為中位,此時泵的輸出流量應(yīng)為零。但有時會出現(xiàn)中位偏離調(diào)整機構(gòu)中點的現(xiàn)象,在中點時仍有流量輸出。其原因是控制器的位置偏離、松動或損傷,需要重新調(diào)零、緊固或更換。泵的角度維持力不夠、傾斜角耳軸磨損也會產(chǎn)生這種現(xiàn)象。
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