Import vacuum pump repair methods: 1, we must first understand the type of Alcatel vacuum pump, features, the current situation. Understand the requirements, determine the repair target. Before testing, prepare for testing. 2, to determine the vacuum pump failure, diagnosed the fault. Judgment, may save trouble. Confirmed to verify. 3, ruled out pump failure, the first simple and complex, the first easy hard. Do not disassemble without demolition. To reduce the lack of special tools and improper operation caused by new damage, reduce the position changes and run-in time. In general, the splicing rotor is not removable, otherwise the form of tolerance can not be guaranteed, the rotor scrapped. 4, toxic and harmful, corrosive vacuum pump, should be asked to clean the user first, and inform the necessary protective measures to protect the health of maintenance personnel. 5, dry vacuum pump fault classification suggested that the fault is divided into operational failures and performance problems. Operation failure can include pump does not turn, the pump temperature is too high, oil spills, water leakage, the maximum power exceeded. Performance failure can include the ultimate pressure, extreme pressure, suction efficiency, noise, fuel injection, gas town performance, etc. can not meet the requirements or not. 6, fault diagnosis and diagnostic examples (1) Edward vacuum pump does not turn. Unidentified can not open the pump, so as not to aggravate the fault. Can be used to move hands and can not move. ①vacuum pump can move without rotation. The reason can be coupling failure; belt slippage; motor wiring is wrong; motor damage; no power and so on. ② can not panic or plate up very heavy, the reason can be because the starting pump temperature is too low, the pump oil viscosity is too high; design and manufacture of pump stop too much oil. Too much oil caused by the pump back to the oil too much (too much fuel, or water vapor condensation in the pump, or condensate in the exhaust pipe back to the pump); foreign matter in the pump (intake manifold welding (Copper sleeve, rotor, wall, pump cover, stator, bearings). (2) the temperature of the vacuum pump is too high. Low-grade exhaust valve measured near the maximum oil temperature exceeds the manual value.As the pump temperature will cause a substantial decline in the viscosity of the pump oil, and the saturated vapor pressure of the pump oil to increase the maximum pressure of the pump and pumping The gas efficiency is reduced; the rubber parts are easily aged; the thermal expansion reduces the running clearance, especially the thickness direction of certain non-metallic rotary blades and the clearance of the copper sleeve inner hole, affecting the reliability of pump operation. The ambient temperature is too high, the intake air temperature is too high, the intake cooling device fails, the pump long-term continuous operation inlet pressure is too high; water cooling pump cooling water is insufficient, circulating water design is not good; temperature control water regulating valve failure, etc. (3) Import vacuum pump oil spills Can occur in the shaft seal, the sealing surface of the fuel tank and pump parts, oil drain plug, oil standard, the head of the oil hole, the through hole connection of the stator part and the support, the gas ballast valve (for example, 2X-8) Seal aging, improper installation, damage to the failure, the surface is not flat, there are impurities, rough and loose castings, etc. If you stop the pump back to the oil, the oil will enter the gas town valve, the gas valve may not leak gas. Pad, be sure to use oil-resistant rubber, according to the original design shape, the sealing surface is too large when the pressure will leak (4) imported vacuum pump leakage can occur in the water pipe joints, (5) High power over standard. Can be long-term continuous for the inlet pressure is too high, the exhaust pressure is too high, debris into the occurrence of occlusion, Pump temperature is too high, rotary vane, etc. with the gap is too small, the voltage is too high, too much pump fluid back into the pump, etc., will cause damage to the motor should try to avoid long-term continuous operation near the maximum power.If there is sediment on the surface, To be regular (6) The dry pump ultimate pressure is not up to standard, which can be caused by external leakage, internal leakage, blockage of oil hole, poor or deteriorated quality of pump oil, condensable substances such as water vapor, distortion of instrumentation and abnormal operation of vacuum pump When there is more leakage, the exhaust port can see the white steam, there are more bubbles in the oil mark, and the exhaust pressure can be felt by the hand in the exhaust port. Increase.At this time, we should first check whether the gas town valve has been closed.Because the new pump factory in the pump each port to measure the ultimate pressure, so if the leakage phenomenon, the pump port and the pipeline, valves, containers one by one to check. Shaft seal failure, the oil cup oil-free, head leak can also result in leakage.The internal leakage can be the pump movement gap, the exhaust valve seat plane, the exhaust valve sealing surface, the shaft seal, pump cover plane, Intake pipe, gas valve seals, etc. Wear, corrosion, bite will make the running gap increase.Oil blocking, open the fuel filler hole to listen, the pump noise will be lighter, the tank seal is good, if the hand There is suction on the exhaust port Sleep, the exhaust valve may fail. If the vacuum pump oil clean, unused long-term storage, the valve can be opened to purify the water vapor pump. If invalid, should check apricot meter. If the pump oil yellow and white has emulsified, the gas can be fully open the town, adjust the atmosphere to purify the operation, if necessary, the amount of gas into the pump port operation, can speed up the purification process. If other volatile gases or liquids are pumped, please change the oil in time and wash the oil tank if necessary. Some pumps, in the interstital airway will be deposited pump fluid, in order to obtain a good oil change effect, to find ways to drain the pump fluid. The ultimate pressure is measured using a seat compression mercury vacuum gauge. Measured values ​​increase with a full pressure gauge such as a calibrated thermocouple gauge. Note the regulation of the thermocouple gauge to be paired. It is advisable to back up a calibration that is calibrated at the same time for comparison against any suspected contamination regulation. Increasing the ultimate pressure will decrease the pumping efficiency during high vacuum and will also raise the ultimate total pressure. Can refer to the above description to determine, check, deal with the decline in pumping efficiency and the ultimate pressure rise of the failure. (7) Vacuum pump noise. Pump structure design, the motor and pump bearing noise, rotating pieces and other moving parts are smooth, too much oil into the fan, the noise generated by the transmission, a large intake, open air town operation, the oil pan and other pumps Loose parts, inequitable installation caused by vibration, will affect the pump noise. (8) vacuum pump fuel. To prevent the injection of fuel tank back to the oil hole size, location, sealing conditions, oil retaining plate design, installation, exhaust part of the mist reducer, oil cap, gas separator, the level of oil into the oil The amount of the size, will affect the pump fuel injection, pump open air pumping, direct pump exhaust air flow rate can be as high as 30m / s, blowing the oil surface, the pump circulating oil and air out of the oil Will test the measures to prevent fuel injection. 7, other. Some vacuum pumps have oil pumps, oil separators, check valves on oil circuits, mist eliminators, inlet filters (for oil vapor return flow), inlet dust filters and other components or accessories, and also for inspection . Pump failure will pump lubrication and seal failure, mist eliminator failure, it is possible to make the exhaust pressure increases, the power increases, damage to the motor, inlet filter failure can increase the intake resistance, pumping speed decline, pumping Decreased efficiency. 8, vacuum pump cleaning. Should not be dipped, so as to avoid the spill into the splicing internal, difficult to discharge. 9, vacuum pump disassembly. In accordance with the use of shouting recommendations and regulations to orderly carried out, remember the location, reasonable display, so as to avoid wrong equipment. The above is the import vacuum pump maintenance methods.
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