為了探討往復(fù)式壓縮機(jī)氣閥的無損故障診斷技術(shù),對3Cr13不銹鋼氣閥試樣進(jìn)行連續(xù)加載的拉伸試驗,利用聲發(fā)射技術(shù)對其拉伸過程中的損傷線定位聲發(fā)射特性、斷裂聲發(fā)射特性進(jìn)行分析,并采用S3400型掃描電鏡進(jìn)行斷口形貌分析.試驗結(jié)果為:氣閥試樣在距離3號佳感器30 mm處出現(xiàn)較強(qiáng)聲發(fā)射峰,在拉伸時間為175.5 s時,試樣發(fā)生斷裂.氣閥試樣在承受83 kN拉力時,試樣表面呈現(xiàn)規(guī)則的層狀形貌.當(dāng)3Cr13不銹鋼氣閥試樣的撓度為0.48和0.74時,氣閥試樣的振鈴計數(shù)分別為3.7×103和27.1×103個.在3Cr13不銹鋼氣閥試樣斷口上有大量微裂紋,是斷裂過程中產(chǎn)生幅度為43~80 dB信號的主要原因.在3Cr13不銹鋼氣閥試樣斷口表面,其主要成分為Cr元素,其重量百分比含量為13.8%.
In order to study the non-destructive fault diagnosis technology of reciprocating compressor gas valve,the linear location and breaking-down process acoustic emission characteristics of the valve samples were investigated by using acoustic emission technology in this paper.And the fracture morphology was observed by scanning electron microscopy (SEM).It was indicated that the strong acoustic emission peak appeared at the valve specimen at a distance of 30 mm apart from the number 3 sensor.3Cr13 stainless steel valve sample fractured when the drawing time was 175.5 s,and the maximum acoustic emission amplitude was 84 dB.And the morphology of this sample showed a layered and sequential structure.When the deflection was 0.48 and 0.74,the ring count was 3.7×103 and 27.1×103,respectively.The fracture of 3Cr13 stainless steel valve sample had a large number of micro cracks in the test process,and it was the main reason for the signals.Cr element was the main composition in 3Cr13 stainless steel valve sample fracture,and its content was of 13.8 wt.%.

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