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    材料在低氣壓下的試驗



    隨著海拔高度的增加,氣壓降低,從而使材料所處的氣范圍內的環境沮度降低。在低壓和各種溫度(正的或負的)下對材料的試驗是在真空加熱箱中進行的,放置在這種試驗箱中的試樣也可以進行耐振動試驗。這是一個鑄成的金屬箱子,其外部帶有加強筋以提高鋼性,前壁上有一扇欽接窗1以便于從箱內儀表上讀取讀數。

    帶螺母的四只平旋螺桂將窗門牢牢卡緊在側壁上而使試驗箱密封。一塊屏板將箱體分成兩個箱室。下箱室裝有一個可將箱內溫度升到50℃的螺旋加熱器,被強迫流過螺雄管的保證將溫度控制在020℃范圍內,而放在下箱室內一只盤子中的千冰可將溫度保持在零度以下。被試試樣放在上箱室中并固定在振動臺上的支架上,空氣溫度由溫度計或熱電偶側出。觀察窗的玻瑞上涂有一層特殊的油脂,或在箱中放入一只盛有氯化鈣的盤子,以避免潮氣使玻璃發霧。試驗箱由聳接頭和三通接頭通過軟管與壓力計”和真空泵(兩者都安裝在箱外)連接。兩只針形閱裝在箱體的前覽上。閥裝在連接其空泵到箱體和壓力計的管線上,以控制從試驗箱中抽出空氣的速度。叼將試驗箱與大氣連接。振動器的電動機、照明燈和加熱器從交流電源取得電力,引接線穿過氣密絕緣套管進入試驗箱。箱內還有兩個氣密的高壓絕緣套管用來試驗材料的電氣強度。

    壓力計左右兩個支管內的水銀液面的差AP'確全了箱內壓力和環境大氣下的壓力差。當然,除了水銀類型外,很可能使用其他壓力計。由于壓力計管中水銀的體積隨環境大氣的退度而變化,當溫度偏離零點時,壓力計的讀數在對溫度象移誤差‘,進行修正。壓力計的壓力讀數單位為Pa(mmHg

    大氣溫度偏離參考值(0),5℃時的溢度漂移誤差修正系數,。修正系數與水銀柱的高度有關,因此該表給出了從壓力表刻度上得出的各種讀數的修正值。如果環境空氣的溫度(水銀的溫度)高于零,修正值為負值(從讀數中減去),反之為正值(加在讀數上)

    更多低氣壓試驗箱請點擊www.modfert.com。

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