There are two types of twin-screw pumps: sealed and unsealed. According to whether the medium enters the mesh space from one end or both ends, twin-screw pumps are divided into double suction and single suction structures.

Twin screw pump is an externally engaged screw pump, which uses two mutually engaged and non-contact screws to pump liquid.

The twin-screw pump is a double suction non closed twin-screw pump. The driving screw extending out of the pump at one end is driven by the prime mover. The driving screw and the driven screw have threads with different rotation directions. The screw is closely fitted with the pump body. Driven screw is driven by driving screw through synchronous gear.

As a positive displacement pump, the suction chamber in the twin-screw pump should be closely separated from the discharge chamber. Therefore, the clearance between the pump body and the external surface of the screw and the screw should be as small as possible. At the same time, sealing cavities are formed between the screw and the pump body, and between the screw and the screw to ensure airtightness, otherwise liquid may flow back from the gap.

Twin screw pump can be divided into two forms: internal bearing and external bearing. In the structure type of built-in bearing, the bearing is lubricated by the conveyor. The working chamber of twin-screw pump with external bearing structure is separated from the bearing. Because of the structure of the pump and the side clearance between the screws, it can transport non lubricating medium. In addition, the synchronous gear is adjusted so that the screw does not contact, and half of the output torque is transmitted to the driven screw. Like all screw pumps, external bearing twin screw pumps also have self-priming capacity, and most pump delivery elements are symmetrically arranged with double suction, which can eliminate axial force and also have large suction height.

Twin screw pump series products are divided into single suction twin screw pump and double suction twin screw pump. This series of products have special screw lines and supporting special structures, which are widely used in various industries such as petroleum, chemical industry, metallurgy, steel, electric power, shipbuilding, pharmacy, food, building materials, etc. Its wide range of applicable media, transmission range, and complex application conditions are incomparable to other pump products. These characteristics also make this series of pumps have potential application and development prospects.