Piston Vacuum Pump overhaul

For the inspection of the piston vacuum pump, it is generally necessary to completely disassemble the pump, comprehensively check, and measure the gap between the slide valve and the pump body (normal clearance is 0.04~0.12mm); check the slide valve and guide pump eccentric wheel in the pump Whether there are cracks on the surface, cracks on the surface, and immediate replacement; all the seals in the pump are replaced; in the dynamic operation of the pump, the vibration tester can be applied to test the vibration of the pump every week. According to the measured data, It can preliminarily determine the wear condition of bearings, slide valves and other components. When the bearing movement accuracy is reduced, replace it to avoid the impact and friction between the slide valve and the pump chamber due to the wear of the bearing. A vacuum gauge is applied to the repaired mechanical pump to perform an ultimate pressure test to determine the performance and repair effect of the pump. For old pumps that have been used for a long time, the gap of the pump is greater than 0.1mm and less than 0.2mm. The ultimate vacuum requirement is not very demanding. Vacuum pump oil with a kinematic viscosity of 150mm2/s can also be used to meet the normal operation of the pump.

Due to the wear of the pump chamber, the pump with a gap between the spool and the pump chamber greater than 0.2mm needs to cooperate with the manufacturer of the pump. According to the wear condition of the pump chamber, the spool valve, eccentric wheel and guide rail are specially made to make The pump cavity maintains a normal clearance; if the pump cavity is worn and severely scratched, the pumping time and the ultimate pressure cannot meet the process requirements. The repair spare parts cost is close to about half of the new pump price, and the maintenance value has been lost. The new spool valve should be replaced. Vacuum pump.Roots-vacuum-pump-working-principle