Structural characteristics of twin screw pump

Twin screw pump is an external screw pump, which uses mutual engagement, do not contact with the two screws to pump liquid. Twin screw pump as a positive displacement pump, pump suction chamber should be closely spaced with the discharge chamber. Therefore, the pump body and the outer surface of the screw and screw and screw clearance should be as small as possible. At the same time, the screw and the pump body, the screw and the screw also form a sealed chamber with each other to ensure airtightness, otherwise liquid may flow backwards from the gap. Twin Screw Pump Twin Screw Pump can be divided into built-in bearings and external bearings in two forms. In the built-in bearing structure of the bearing lubrication by the transport. The external bearing structure of the twin-screw pump cavity with the bearing is separate. Due to the structure of this pump and the side clearance existing between the screws, it can deliver non-lubricative media. In addition, adjusting the synchronizing gear makes the screw non-contact while transmitting half of the output torque to the driven screw. As with all screw pumps, the external bearing twin screw pump also has a self-priming capability and most pump delivery elements themselves are double-suction symmetrically arranged to eliminate axial forces and also have a large suction height. These characteristics of the pump make it in the oil field chemical and shipbuilding industry has been widely used. External bearing-type twin-screw pump can be used according to a variety of ordinary cast iron, stainless steel and so on. Made of different materials. Conveying temperature up to 250oC. The pump has a different heating structure, the theoretical flow rate up to 2000 cubic meters / hour. The characteristics of twin-screw pump: no stirring, no pulsation, smooth delivery of a variety of media, as the pump structure to ensure that there is always pump working fluid pumping liquid as a sealing liquid, all pumps have a strong self-absorption capacity, And can be liquid-vapor mixed. The special design of twin-screw pump structure pump to ensure that the pump has a high suction performance that is very small NPSHr value. The use of independent lubrication of the external bearings, allowing delivery of a variety of non-lubricating media. Horizontal, vertical, with heating jacket, and other structures complete, can transport a variety of clean solid particles without low viscosity or high viscosity medium, the choice of the right material, and even can transport many corrosive media.

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