Before the vacuum pump needs to be shut down, the mechanical vacuum pump connecting pipe must be broken first to ensure the mechanical vacuum pump's air pressure, and then the mechanical vacuum pump is cooled, and the vacuum pump oil can be released first. After 20 minutes of clean cooling of the oil in the pump, the mechanical vacuum pump can be removed.


1. Maintenance schedule for mechanical vacuum pump

The maintenance time interval of the mechanical vacuum pump should be determined according to the environment of the vacuum pump. For example, the vacuum pump must be frequently overhauled if the water, impurities and dust are included in the gas extraction, and the maintenance schedule can be extended on the contrary.


1, daily maintenance matters, check the oil and oil level in the pump.


2, maintenance matters need to be checked every week, check whether the vacuum pump leaks oil or not, and the air filter is used to clean the dust and debris left on the assembly and intake air filter.


3, every month needs maintenance, check the exhaust filter (oil mist separator) function, whether there is smoke, spray and other phenomena, if there is a problem, the need to replace the vacuum pump exhaust filter.


4, every 6 months needs maintenance, check whether the vacuum pump cavity has dust, dirt, carbon, impurities, and so on. If necessary, the vacuum pump can be cleaned up, including oil tank, pump body, fan, fan wheel, ventilation grille, cooling fin.


5, every work 500~2000 hours to need maintenance: replace the vacuum pump exhaust filter, vacuum pump oil, vacuum pump oil filter, check pump float valve, and oil return pipeline.


Please ensure that the vacuum pump is under shutdown when doing the above operation.


Two. Inspection method of vacuum pump oil

Inspection of vacuum pump oil can be seen through the oil view mirror view of the pump oil, if the pump oil is lower than the oil view mirror "MIN" marking, it should be checked whether due to the process requirements.

The color of the vacuum pump oil must be bright and clear. There is no foam or turbidity. After the rest of the oil, there is a clear milk white substance and black carbon crystal. Then the vacuum pump oil must be replaced and the same type of vacuum pump special oil is added.


Three. The service life of vacuum pump oil

The service life of the pump oil depends on the working environment of the vacuum pump. In the working environment where the gas is clean and dry and the working temperature is below 100 degrees, oil and oil filters must be replaced every 500-2000 hours or every half a year. In a very bad working environment, less than 500 hours of oil change must be made, if the oil is less than 500 working hours. In order to remove corrosive gases, special intake filters and special synthetic oil must be used. Fluorine oil is necessary if necessary.


Four. Replacement of vacuum pump oil and oil filter

1, vacuum pump oil drainage, cut off the vacuum pump power for 20 minutes, to ensure that the vacuum pump has been through the air pressure, find the vacuum pump oil outlet (oil view mirror below), spin off the oil outlet to release the vacuum pump oil, when the pump oil flow is small, the pump can restart the vacuum pump for several seconds, again close the air pump after cutting off the power supply and re swirling the lower oil mouth. Drain the oil and repeat the action many times until the vacuum pump is exhausted.


2, cleaning the vacuum pump, the first need to exhaust the waste oil, according to the 50% vacuum pump oil, 50% paraffin or diesel fuel / fuel oil proportion of 2L cleaning liquid; tighten the oil slug into the vacuum pump, close the air intake, start the vacuum pump for at least 30 minutes; then discharge the cleaning liquid, and discharge the cleaning solution according to the ring. The protection of laws and regulations.


3, check float valve: unload the joint between the oil pipe and the tank, then unload the two screws of the float valve flange, remove the float valve from the tank, check whether the float valve is clean and damaged, and clean it with compressed air when necessary. When assembling, pay attention to the installation of the sealing ring on the flange of the float valve and keep it intact, and place the float valve in the correct position of the fuel tank.


4. Replace the oil filter: dripping the lubricant on the sealing ring of the new oil filter, assemble and tighten it by hand.


5, the injection of new oil: screw down the filling plug, into the vacuum pump special oil, to ensure that the oil position in the oil position mirror "MIN" and "MAX" marks; tighten the sealing ring filling plug.


Five, exhaust filter

1, the inspection of the operation of the vacuum pump: use the exhaust filter pressure gauge to detect the blockage of the exhaust filter. When the readings of the pressure gauge are in the red area, the exhaust filter has been blocked and must be replaced. If there is no exhaust filter pressure gauge, the resistance of the exhaust filter is determined by the change of the current of the driving motor. The discharge of excessive current or the flow of the vacuum pump is reduced, indicating that the exhaust filter has been blocked and must be replaced.


If the exhaust filter pressure gauge indicates the lower pressure than the usual, or the motor consumption is less current than usual, the reason is that there is an exhaust filter damaged, the need to replace the exhaust filter. If the discharged gas contains oil, the reason is that the exhaust filter is blocked or damaged, so it must be replaced. The exhaust filter can not be thoroughly cleaned, and the blocked exhaust filter must be replaced.


2, before replacing the exhaust filter, please close the vacuum pump and cut off the power supply, ensure the vacuum pump has passed the air pressure, open the vent cover plate from the tank, and dismantle the exhaust filter with the special inner six hand, and install the opening end of the new exhaust filter with the seal ring in the correct position in the tank.


Six. The overhaul of the vacuum pump

In order to achieve the highest efficiency and longer service life of the vacuum pump, the installation and calibration have precise tolerances. With the most disassembly vacuum, the calibration tolerance will be lost. Therefore, disassembly and installation must be provided by the "professional vacuum pump manufacturer" company. Pollutants will remain in the pores, gaps and internal parts of vacuum pumps, and dismantling vacuum pumps containing pollutants will be harmful to health. Dismantling and installing vacuum pumps, operators must wear protective equipment.


Seven. Stop use of vacuum pump

1, temporarily stop using: please pass the atmospheric pressure first, then disconnect the pipeline or air inlet.


2, re-use: first remove the fan cover of the driving motor, rotate the fan wheel slowly with your hands, and install the fan cover according to the direction of rotation. Open power start. If the pump is stopped for a long time, vacuum pump oil must be removed.