Limit pressure of rotary vane vacuum pump

1. If a pneumatic solenoid valve is installed at the pump port of a rotary vane vacuum pump, it should be installed horizontally and operated simultaneously with the vacuum pump. When the relative humidity is high or the condensable vapour such as water vapour in the extracted gas is high,'the dilapidation valve shall be used. Auxiliary method for judging steering. The sheath of rotary vane vacuum pump is inverted so that it is absorbed on the pump mouth after opening the pump. It is positive, blown off and reversed. Normal sound is positive and abnormal sound is reverse. Full pressure gauge should pay attention to the matching calibration and standby comparison between gauge and regulation - it is recommended that Chu-1 ball valve be used between gauge and pump under test. Vacuum pump oil is recommended according to the instructions. Note that the vacuum pump oil can not be mixed with mineral oil type vacuum pump oil and other oils. It must be strictly cleaned before it can be replaced. The limit pressure of the vacuum pump oil is determined by the compressed mercury vacuum gauge.
2. Collect spare parts and technical documents, dismantle exhaust protective parts, install them as required, wiring, trial steering, water cooling pump. Before using the rotary vane vacuum pump, you should read the instructions carefully. After opening the box, you should check the weight of the truss. In order to prevent fuel injection due to oil return and reversal, the rotary vane vacuum pump mouth should be opened first, and the oil in the pump should be transferred to the tank by hand tray according to the regulations. At the same time, if you look at the oil level, you should be above the center of the oil mark, but not full of the oil mark. If you have more oil, you should die.
3. At this time, first check whether the air ballast valve has been closed. When the oil hole is blocked, the noise of the pump will be lighter when the oil hole is opened. If the hand is sucked on the exhaust port, the exhaust valve may fail if the oil tank is well sealed. Internal leakage can be caused by wear, corrosion and occlusion of movement clearance, exhaust valve plane, exhaust valve sealing surface, inner shaft seal, pump cover plane, intake pipe, gas ballast valve seals and so on.
4. The reasons for the high temperature of vacuum pump may be that the ambient temperature of the pump is too high, the intake temperature is too high, the intake cooling device is invalid, the medium pressure of the pump is too high for long-term continuous operation, the cooling water of the water-cooled pump is insufficient, the design effect of circulating water is not good, the temperature control water regulating valve is invalid, etc. Closing the valve at unexpected time can prolong the service time of the regulation. White steam can be seen at the exhaust outlet when there is more leakage. There are many bubbles at the oil mark. The hand feels the exhaust pressure on the exhaust port. There are many bubbles on the oil surface at the lower exhaust valve. Power will increase. The pump temperature is too high. The highest oil temperature measured near the lower exhaust valve exceeds the specified value in the instruction. As the temperature of vacuum pump increases, the viscosity of pump oil decreases sharply, and the saturated vapor pressure of the front pump oil increases, the limit pressure of rotary vane vacuum pump increases and the pumping efficiency decreases; rubber parts are easy to aging; thermal expansion makes the operation reliable.

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