Cause of tripping of water ring vacuum pump: two water ring vacuum pumps are combined into one pipeline, there is no valve installed between the two pumps, and there is only one check valve at the inlet, which can not be completely sealed. Because the working mode adopted in our daily production is one for use and one for standby. When one of them works, the water inside the other water ring vacuum pump will be sucked in, and even the exhaust pipe will pump back the circulating water and atmosphere, which is the reason for the trip. Cause of air leakage of vacuum pump: the inclined bearing will tilt the impeller and install it in the pump body. The axial clearance of single acting pump is uneven. When the impeller rotates, part of it rubs with the side cover, damaging the side cover and impeller end face and increasing the axial clearance. The gas in the compression chamber leaks into the suction chamber through an enlarged gap, which reduces the vacuum and exhaust pressure. At this time, the bearing of the screw vacuum pump must be removed for repair, and then installed correctly. Vacuum pump blockage: Vacuum unit sandblasting process the natural air drying time of vacuum unit sandblasting depends on the internal complexity of the product. The air drying time of precision castings is generally about 5 ~ 8 hours. In the process of sand blasting, special attention must be paid to the relevant operation process. In order to better ensure the quality and service life of products, we cannot be ignorant. We must accumulate more experience and skills. Braking mode of water ring vacuum pump. Regenerative braking: when the water ring vacuum pump decelerates or stops, the energy generated by braking is fed back to the DC bus through the inverter circuit and absorbed through the resistance circuit. Regenerative braking works when the server works normally. It cannot be braked in case of motor failure, emergency stop, power stop, etc. The work is performed automatically by the system. Functional advantages of vacuum pump: energy saving, environmental protection, emission reduction and efficiency improvement. Instead of steam jet pump, the effective energy-saving rate is more than 85% and there is no wastewater discharge. It has a strong ability to pump out condensable gas including pure solvent gas, can realize gas-liquid separation, fine diversion and recycling, can really realize a large amount of liquid discharge, and can discharge liquid while working normally in practical work. Effectively improve production efficiency and improve product quality by using the scope and purpose of vibrating screen. The sealing form is composed of skeleton seal, mechanical seal and special seal to ensure the safe isolation between the pump chamber and the oil tank. It can be started under normal pressure, continuously and directly pump and discharge the atmosphere, and the vacuum degree can be adjusted according to the user's process environment.