According to the material characteristics of the customer, during the operation of the rotor pump, the material flow rate is uneven or when the material is cut off, the rotor pump will be idling. The rotor pump with sealed structure, the mechanical seal of the rotor pump is equipped with an oil cup, the main function is to optimize the lubricity of the mechanical seal, so as to realize the idling of the mechanical seal in a short time, and prevent the dry grinding of the mechanical seal during operation .