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1 故障现象我院一台上海产77型高频电刀,当开关K_1置于“电刀”位置时输出正常;但置于“电凝”时该机无输出。2 故障检修怀疑可能是其火花塞间隙过大,经过仔细调整,故障依旧。由于选择开关曾经损坏过,拆开开关,检测内部导线,元件均无损坏。分析其工作原理,当K_(1-1)位于“刀”时,机器处于电切割状态,此时电源220V直接加到主电源变压器B_1的初级,同时火花塞H_1~H_4经开关K(1-2)与L_2,L_3及C_2组成振荡电路,产生高频减幅波;当开关K_(1-1)置于“凝”时,机器处于电凝止血状态,这时通过K_(1-1)的220V电压经LFC、JK加到B_1的初级,同时火花塞H_1~H_4经开关K_(1-2)与C_3、L_3组成振荡电路,并由L_4自耦合升压,经L_1、C_1输出高频减幅波。所以,电凝振荡电路中的电容C_3(0.036μF)或电感有可能损坏。经检测电容、电感均正常,但B_1的初级电压为0V。原来,扼流器LFC已断。更换LFC,该机工作正常,故障排除。
1 Fault phenomenon A 77-type Shanghai high-frequency electric knife produced by our hospital has normal output when the switch K_1 is placed in the “electric knife” position, but it has no output when it is set to “electric coagulation”. 2 The suspicion of troubleshooting may be that the spark plug gap is too large. After careful adjustment, the fault persists. Since the selector switch was once damaged, the switch was disassembled and the internal wires were detected. The components were not damaged. Analysis of its working principle, when K_ (1-1) is located in the “knife”, the machine is in an electric cutting state, when the power supply 220V is directly added to the primary of the main power transformer B_1, while the spark plug H_1 ~ H_4 via the switch K (1-2 ) and L_2, L_3 and C_2 form an oscillation circuit to generate a high-frequency ripple; when the switch K_(1-1) is set to “condense”, the machine is in an electrocoagulation and hemostasis state, and this time passes through K_(1-1). The voltage of 220V is added to the primary of B_1 by LFC and JK. At the same time, the spark plugs H_1~H_4 form an oscillation circuit through switches K_(1-2) and C_3 and L_3, and are boosted by L_4 self-coupling, and the high frequency attenuation is output via L_1 and C_1. wave. Therefore, the capacitor C_3 (0.036 μF) or inductor in the electro-condensation oscillation circuit may be damaged. The detected capacitance and inductance are normal, but the primary voltage of B_1 is 0V. It turned out that the choke LFC was broken. Replace LFC, the machine is working properly, troubleshooting.