The operation of the rotary-vane vacuum pump considerations and troubleshooting -

rotary vane vacuum pump rotor eccentric at a certain distance is installed in the pump shell, and close to the pump shell on the surface of the fixed surface. Two ( Or more) Rotary vane is installed in the rotor slot. When the rotor rotates, rotary vane can slide back and forth along the radial grooves, and always in contact with the pump shell wall. Rotary vane with rotor rotation, the vacuum pump chamber into several variable displacement. Operation of the rotary-vane vacuum pump are pay attention to the following:

1, check the oil level, to stop the oil pump oil to the center is advisable. Too low can't seal exhaust valve oil, vacuum degree. If too high, in the atmosphere will cause the fuel injection start. During operation, the oil level has increased, this is normal phenomenon. Oil should be specified brand clean vacuum pump oil from oil hole to add. After filling, should tighten the screw. Oil should be filtered to prevent foreign bodies from entering the block oil hole.

2。 Can be in any atmospheric pressure or vacuum pump start next time. If a solenoid valve installed in the pump port, should with the pump operating at the same time.

3。 When the environment temperature is too high, the oil temperature rises, the viscosity decreases, the saturation vapor pressure increases, this will lead to ultimate vacuum is reduced, especially the thermocouple measured full pressure. If the ventilation and heat dissipation is strengthened or oil pump performance improved, limit vacuum can be improved.

4。 Limiting vacuum of vacuum water pump should be according to the compression mercury vacuum gauge to inspect. If the pressure gauge after the pre-test, the temperature of the pump will reach stable level, the port of the pump will be connected directly to the pressure gauge, and running 30 minutes will reach the limit of vacuum. Total pressure gauge measuring the value of the related to pump oil, vacuum gauge, and adjust the error. Sometimes the error may even very large, only supplies the reference.

5。 If the relative humidity is high, or pumping the gas contain more condensable vapor, after the connection pump container, should be in the mobile 20 ~ 40 minutes after the open pressure valve, close the pneumatic valve. Before stopping pump, pneumatic valve can open no-load running for 30 minutes, in order to prolong the service life of oil pump.

if the rotary-vane vacuum pump operation is not normal, often appear fault, such as rotary vane vacuum pump vacuum degree decline, fuel injection, smoke, oil seal leakage, noise, etc. Vacuum pump oil emulsification phenomenon in the pump, etc. In this case, first of all, don't panic, and then turn it off after eliminating them one by one. Here are a few troubleshooting methods.

a, the smoke of the rotary-vane vacuum pump oil injection: refers to the operation in the process of rotary vane vacuum pump exhaust smoke oil injection.

failure 1, smoking. Start pump running to see if there are smoke, this is normal. Smoking is not normal for a long time.

elimination method: smoking said pump inlet outlets of pipe, valves, and the situation of the container needs to be repaired is mainly caused by a gas leak. After the inspection and handling leakage, the smoke will disappear.

fault 2, fuel injection, shows that inlet outlets have a lot of leakage points, even the air intake is exposed to the atmosphere.

elimination method: seal the air inlet of the pump, the pump running. If there is no injection oil, there is a leak. Exhaust valve damage, check whether the exhaust valve piece is damaged, with the new replacement.

2。 The noise of the rotary-vane vacuum pump are: here refers to the noise of the pump.

failure 1, tapping on the cylinder. Rotary vane pump operation, irregular sound, like the voice of the metallic metal. This is the voice of a rotor pump body impact. This kind of situation is by paired rotary plate spring fracture or fault caused by shrinkage or pop-up.

elimination method: remove the pump body, check whether the helical spring is damaged. Replace the spring.

2, exhaust valve noise fault, mainly is the pump exhaust valve damage.

elimination method: replacing good exhaust valve.

3。 Rotary-vane vacuum pump vacuum decline: refers to the current measurement of rotary vane vacuum pumps or before using the vacuum degree of vacuum degree is lower than the factory indicators. There are many reasons for low vacuum degree. Here are some main conditions.

failure 1, the added vacuum pump oil is different from the original brand. Due to the saturation vapor pressure, vacuum pump oil in different brands have different results.

elimination method: according to the product model to select the correct vacuum pump oil.

fault 2, pumping the gas, water vapor and impurity content is too high, lead to the vacuum pump oil emulsification discoloration or too dirty.

elimination method: drain pump of vacuum pump oil, replace with the same type of pump oil, and set the filter to ensure the water vapour in the pumping gas and impurities is not in into the pump.

failure 3, pumping gas temperature may be too high.

elimination method: reduce pumping gas temperature or increase the corresponding heat exchanger.

failure within 4, water pump oil blockage or poor, no reserve a certain amount of oil pump chamber.

elimination method: check whether the oil is flowing, and add the same type of vacuum pump oil.

fault 5, the gap between the internal parts. This is because the long-term pumping gas containing dust, lead to clearance between rotor and stator increase after the wear and tear.

elimination method: check whether the gap is too big, replace with new parts.