论文部分内容阅读
据统计,电热管的大部份故障见于接线柱附近,如接线柱与电热管金属外壳绝缘不良产生漏电;接线柱螺钉因电弧烧蚀或氧化而损坏;紧固接头与金属外壳间漏水等。因电热管发热丝中段烧坏或管壳腐蚀而使电热管损坏的故障比较少见。据此,对接线柱附近的故障可用不同方法加以排除,以恢复对电热管的使用。一、接线柱与金属管壳间绝缘电阻明显降低,而两接线柱间电阻值正常者,应小心拆下螺母及绝缘瓷柱,轻轻刮净接线柱与管壳间的炭痕和污物,二者间恢复正常阻值时,将上述部位涂复绝缘清漆或环氧树脂,干燥固化后即可使用。二、接线柱与管壳间经刮除污物处理后,阻值如无明善提高,可用万用表R×1档分别测量两接线柱与管壳间阻值,如一端阻值较小,另一端较大,两者之差与电热管正常阻值基本一致者,则阻值较小的那一端,接线
According to statistics, most of the failures of the electric heating pipe are found near the terminal. If the metal housing of the terminal and the heating pipe is poorly insulated, leakage occurs; the terminal screw is damaged due to arc erosion or oxidation; and the joint leaks between the connector and the metal housing. The failure of the heating tube to damage the middle section of the heating element of the heating tube or the corrosion of the shell is relatively rare. According to this, the fault near the terminal can be eliminated in different ways to restore the use of the heater. First, the insulation resistance between the terminal and the metal shell is significantly reduced, and the normal resistance between the two terminals should be carefully removed nuts and insulated porcelain column, gently scraping the carbon between the terminal and the shell marks and dirt When the normal resistance is restored between the two, the above parts are coated with insulating varnish or epoxy resin, which can be used after being dried and cured. 2. After the scraper removes the dirt between the terminal and the shell, if the resistance is not improved, use a multimeter R×1 to measure the resistance between the two terminals and the shell. For example, if the resistance at one end is small, the other end Larger, the difference between the two is basically the same as the normal resistance value of the electric heating tube, then the smaller resistance end, the wiring