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Rotary vacuum pump referred to as "rotary vane pump." Its models are the following: 2X rotary vane vacuum pump, 2XZ rotary vane vacuum pump, XD rotary vane vacuum pump, TRP rotary vane vacuum pump. The pumping speed ranges from 0.5 to 150 liters / second (1 liter = 10-3 m 3). The operating pressure range is 1 × 105 to 1 Pa and the pressure range for large pumping speed is 1 × 105 to 13 Pa. The ultimate pressure: single-stage rotary vane pump is 1 Pa, double-stage rotary vane pump is 6.5 × 10-2 Pa. The pump is suitable for pumping dry or gas containing a small amount of condensable vapors. It is not suitable for pumping high oxygen, explosive and corrosive gases, which chemically act on the vacuum pump oil and contain a large amount of solid particles. In the vacuum system inside, the rotary vane pump can be used alone, but also as a booster pump, diffusion pump, Roots pump and other vacuum pump before the pump. Then in the rotary vane pump operation, if the operation is not correct, most of the vane pump failure will occur. Such as the vacuum drop, fuel injection, smoke, oil seal at the oil spills, noise and other conditions there will be rotary vane pump inside the vacuum pump oil emulsification and so on. In the event of these situations, first of all, do not be nervous, the pump stopped after troubleshooting according to one by one to exclude. Here you are introduced to several common symptoms and troubleshooting methods. First, the vacuum drop: refers to the measured vacuum than when the factory or before use when the vacuum is lower. The reason for the low degree of vacuum is many. Here are some examples of common causes of failure to introduce. Fault 1, the vacuum pump oil grades and the original is not the same. Different grades of vacuum pump oil, the saturated vapor pressure is not the same, the result will be different. Remedy: According to the type of product selection of the correct vacuum pump oil. Fault 2, was pumping gas in the water vapor and impurities is too high cause the vacuum pump oil discoloration or dirty. Remedy: Put away the pump vacuum pump oil, put on the same type of pump oil, and set the filter to ensure that the body is pumping gas and water vapor impurities do not enter the pump. Fault 3, was pumping gas temperature may be too high. Remedy: reduce the temperature of the gas being drawn, or add a corresponding heat exchanger. Fault 4, the pump of the oil barrier or not smooth, the pump cavity did not maintain a certain amount of oil. Remedy: Check the oil flow is smooth, and add the same type of vacuum pump oil. Fault 5, the gap with the internal parts become larger. This is the long-term exhaust gas containing dust, etc., resulting in increased wear between the rotating plate and the stator gap. Remedy: Check the clearance is too large, replace the new parts. Second, the noise is too large: here refers to the pump noise. Fault 1, knock cylinder, rotary vane pump issued an irregular sound operation, as if the metal hit the metal sound. This is the voice of the vane that hits the pump body. This condition is caused by a spring break or a contraction or ejection failure between mating vanes. Remedy: Disassemble the pump to check whether the vane spring is damaged. Replace the spring. Fault 2, exhaust valve noise, the main exhaust valve is damaged. Remedy: Replacement of the exhaust valve. Third, smoke and fuel injection: refers to the rotary vane pump exhaust smoke or fuel at the operation. Fault 1, smoke, if the pump has just begun to run a smoke phenomenon, it is normal. If you smoke for a long time is not normal. Remedy: Smoke Description pump inlet, including pipes, valves, containers need to be repaired mainly refers to the result of leakage. After checking for leaks and handling, the smoke will end. Fault 2, fuel injection, indicating a large number of leaks outside the air intake, and even the air inlet exposure to the atmosphere. Remedy: Seal the pump inlet to run the pump, if not fuel injection, indicating a leak; exhaust valve damage, check the exhaust valve is damaged, replace the new exhaust valve.