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                                        膨脹合金氣密性試驗方法的實驗原理和步驟

                                        2015-07-22 0
                                        氣密性試驗試驗原理
                                        將試樣裝在特制的試驗配件上,形成腔體,該腔體和氦質譜儀的質譜室相通。用氦氣噴吹被檢試樣表面,如果試樣有漏隙,氦氣通過漏隙進入質譜室內,部分氦氣被電離成帶正電荷的離子,這些離子在加速電壓及磁場的作用下,按一定的軌道半徑作圓周運動。在特定的位置上設置收集極,只接收氦離子流。離子流的強度正比于氦在質譜室內的分壓,根據離子流強度判定試樣漏氣與否。
                                        氣密性試驗試驗步驟
                                        1、啟動檢漏儀,按制造廠的規定進行預熱
                                        2、按制造廠的說明書調整檢漏儀
                                        3、將試驗配件與檢漏儀接通,然后將試樣置于試驗配件的密封墊圈上,對試樣進行抽氣,并打開真空閥門。
                                        4、采用氦噴嘴對試驗表面噴吹氦氣,探測所有裸露表面,在漏氣率為1*10-10 Pa·m3/s條件下,儀器輸出大于滿量程5%時,再在試樣與密封墊圈接觸處噴涂乙醇,當確定氣體是經由試樣漏入時,判為漏氣。。
                                        北京赛车计划数据
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