Fuel Oil Lubrication Oil Horizontal Triple Screw Pump

Three screw pump is a kind of rotary displacement pump. Its operating principle could be described as follows: Consecutive separate hermetic spaces are formed by accurately fit of a pump casing and three parallel screws in mesh. When driving screw rotates, medium is absorbed into the hermetic spaces. The hermetic spaces make an axial movement continuously and equably as the driving screw moves. In this way, fluid is carried from suction side to delivery side, and the pressure is lift in the whole process

Driving screw is hydraulic balanced, and driven screws are driven by hydraulic pressure. The driving screw and the driven screws never touch each other in normal working condition. Oil film is formed between them, so the helical surface of screws doesn’t wear down with the movement, that provide three screw pumps a long life-span. But it has to be pointed out that driving screw and driven screws are in critical state and touched directly when the pumps are started up or shut down. So the intensity, surface hardness and machining accuracy of screws must be suit for the critical state. Furthermore, driven screws have to suffer some kind of radial force. As a result, screws, insert, materials and pressure in use must be perfectly matched to insure the oil film between outer round of screw and inner bore of bushing not to be worn out and avoid the abrasion of metal surface. With regard to lubricating oil transfer pumps,

SN serial Screw pump is a kinds of Self-priming Triple screw pump, because of the unit assembly system every pump can be supplied as cartridge pump for foot-,flange-or wall mounting, in pedestal-,bracket-or submersible design.

According to the delivery medium heated or cooled designs are also available.

Each pump has 4 installation types: horizontal, flanged, vertical and wall-mounted Single-suction medium pressure series.