3GJ series submerged three-screw pump is a kind of lubricating oil transportation product specially developed for lubricating equipment by Nanjing Aike pump Co., Ltd. According to the market demand. It is designed and produced according to GB/T10886-2002 design, which is small in volume, low in noise, high in efficiency, and long in life. When the active screw rotates under the drive of the prime mover, the main and follower screw forms a seal cavity at a certain length of the meshing helical surface, and the follower screw rotates because of the pressure difference between the two sides of the helical surface, which is driven by the conveying liquid medium. At this point, the liquid is transported into the pump suction hole and then enters the seal cavity in a uniform and continuous way along the axial direction, and smoothly and unstirred from the pump suction chamber to the outlet cavity, Thus, the function of conveying liquid medium is achieved.