1) There is fuel injection at the pump outlet

Add too much oil, reduce the amount of oil added

It should be avoided if the air intake is pumping for a long time;

2) There is fog at the air outlet of the pump:

Check the air inlet and other parts for air leakage

3) Low vacuum degree:

Whether the pump cavity and oil mixed with other light liquid, the new oil should be properly operated for a period of time

Check whether there is air leakage in each sealing part of the pump

Check the measuring instrument well

4. Precautions for oil change of diffusion pump and oil booster pump:

① Select high quality oil products;

② When changing the oil, all the old oil should be poured out;

③ Clean all the parts in the pump with solvent gasoline or special cleaning agent, and dry them with acetone or ethylene glycol, and dry them in the oven, or blow dry them with a blower;

④ Install the internal and external parts of the pump according to the original position, and the nozzle should be in the middle of the pump chamber

⑤ The operator shall wear white gauze degreasing gloves for assembly, and pour diffusion pump oil or booster pump oil according to the required amount;

5. Problems in the use of diffusion pump and troubleshooting methods:

1) Low vacuum degree:

Check the vacuum of the front stage;

Check whether the cooling water is unblocked and whether the water temperature is too high;

Whether the cooling water pipe is partially blocked;

The electric furnace wire power is too large or too small;

Whether the power supply voltage is low;

The fuel injection nozzles are not assembled correctly;

Inaccurate regulatory measurement;

Abnormal instrument or wire;

Whether there is air leakage in the vacuum system;

Whether the residual coating is too thick after long-term use;

2) Due to improper operation, the oil will oxidize quickly, i.e. turn red or black

Check whether you forget to turn on the cold water;

There is serious air leakage in the vacuum system;

When the diffusion pump is working, the atmosphere enters into the diffusion pump;

There is volatile gas or dust into the chamber of the pump.