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  • News >> Double screw pump structural characteristic and Application

    Double screw pump structural characteristic and Application

    1 the structural characteristics of twin-screw pump

    Twin screw pump is outside the engagement of the screw pump, which uses mesh with each other, each other does not contact the two screws for pumping liquid.

    Double screw pump is a positive displacement pump, pump room exhaust inhalation chamber should be strictly separated. Therefore, the pump body and the screw and screw and screw cylindrical surface gap should be as small as possible. At the same time with the screw pump, screw and screw and a sealed cavity is formed between each other, to ensure airtight, otherwise there may be liquid from the gap in the back.

    Twin screw pump can be divided into internal and external bearing bearing two forms. In the built-in bearing structure bearing lubricated by delivery. External bearing structure, double screw pump working chamber with the bearings are separated. Because of this structure and the screw pump exist between the side gap, which can transport non-lubricating medium. In addition, adjustment screw is not synchronized gear makes contact, while half of the output torque to the driven screw. As with all the same screw pump, external bearing type double screw pump is self-priming capability, but the majority of pump delivery components are themselves double-suction symmetrical arrangement, to eliminate the axial force, but also a great high suction.

    These characteristics make it pumps in oil field chemical industry and shipping industry has been widely used. Outboard bearing type double screw pump can be used respectively using common cast iron, stainless steel and other materials in the manufacture. Delivery temperature up to 250 degrees C. Pump with different modes of heating structure, theoretical flow up to 2000 cubic meters / hour.

    Double screw pump characteristics:

    Without stirring, no pulse, smooth delivery of various media, because the pump body structure to ensure the pump working element there is always pumping liquid as sealing liquid, all the pumps have a strong self-priming capacity, and can lose vapor-liquid mixed.

    Pump specially designed to ensure the pump has high suction performance of the small NPSHr value.

    Using an independent external lubricated bearings, allowing delivery of various non-lubricating medium.

    Horizontal, vertical, with heating units and other structural type is complete, can transport all kinds of clean, free of solid particles of low or high viscosity medium, choose the right material, or even transfer a number of corrosive medium.

    2 twin screw pump uses

    The principle known by the twin-screw pump, for the external bearing twin-screw pump, through the bearing positioning, two screws in the Bush is not in contact with each other, the tooth side of the gap between the constant ( the gap value by the working condition and the pump itself specification decisions), screw cylindrical surface of the inner circle and the bushing is also maintained constant gap invariant. Screw transmission gears from the synchronization completed. The gear box has a separate lubrication, and the pump working chamber separated. The utility model has the advantages of greatly broadens the range of use of the twin screw pump, namely: except for conveying lubricating good media, can also transport a large number of non-lubricating medium, various viscosity ( maximum viscosity of up to 3 106mm / s ) medium and corrosive ( acid, alkali and other properties ), abrasiveness liquid.

    Double screw pump clearance because of its constant presence and type of online features, which belongs to a sealing type displacement pump, so in addition to conveying a pure liquid in vitro, still can carry a mixture of gases and liquids, namely the vapor-liquid mixed transportation, which is double screw pump very unique strengths.

    Double screw pump as the unique structure design, can self suction without special self suction device, but also due to axial conveying shaft flow speed is smaller and has strong absorption capacity of the small NPSHr value.

    Twin screw pump can also be dry transfer. As the moving parts do not touch each other at work, so would not undermine short-term dry transfer pump components, such characteristics to the automatic control of the process provides a great convenience, but the dry running time limited by many factors, is generally very short.

    The other twin screw pump in the transportation process without shear, non-emulsifying effect, it will not destroy the molecular chain structure and the working process in the form of a particular fluid properties, and because relying on synchronous transmission gear, pump operation, low noise, small vibration, stable work.

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