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Oil diffusion pump maintenance and care (1) oil diffusion pump installed vertically to the pump core components in the normal working condition. All rubber seals should be sealed and reliable. (2) The oil diffusion pump must ensure that the cooling water is clear before it is heated. The pump can be heated under a vacuum of about 1 Pa. (3) oil diffusion pump stop working, the pump should be avoided into the atmosphere to prolong the life of the pump oil and reduce pump suction, in particular, should stop the pump just stopped working before cooling into the atmosphere, so as to avoid pump oxidation. (4) long-term storage of oil diffusion pump, the best pumping into a vacuum to prevent pump oil pollution and corrosion of parts, and should clean the cooling water pipes and water jacket of the remaining water. (5) was pumping gas should be dry, non-corrosive, dust-free gas at room temperature state. (6) sudden deterioration of performance during normal pump operation, should check the heater is short circuit, open circuit, and three-phase current is balanced. (7) After prolonged work, the performance of the pump is getting worse and worse. Check whether the amount of oil is reduced or oxidized so as to increase the amount of oil or dry the new oil after cleaning. (8) Once loading and unloading, if the performance is still up, we must check whether the seal is reliable or improper assembly. (9) During the operation, pay attention to whether the work of the front-stage mechanical pump of the diffusion pump is normal. The ultimate pressure of the general mechanical pump should be lower than the pressure of the previous stage of the pump by an order of magnitude. When the performance of the mechanical pump deteriorates, it directly affects the oil diffusion The pump is working. (10) For small and medium-sized pump formed by pulling core with pump core, the first-stage nozzle cap should be gently tightened, and the pump core should be prevented from being subject to heavy-weight deformation.