The internal and external bearing structure of twin screw pump

The twin screw pump has a complete range of structures, including horizontal, vertical, and heating jackets. It can transport low-viscosity or high-viscosity media with particles. Adjust the screw spacing according to the size of the particles, select the correct material, and even more corrosive media can be transported.

 

Oil And Gas Drilling, twin screw pump, Oil And Gas Production

 

Twin screw pumps can be divided into two forms: built-in bearings and external bearings.

In the design of the built-in bearing, the bearing is lubricated by the conveying material. The twin-screw pump with the external bearing structure has the working chamber separated from the bearing. There is a side clearance between the structure of this pump and the screw, and the independently lubricated outboard bearings allow it to transport a variety of non-lubricating media. In addition, the synchro gear is adjusted so that the screws do not touch, and at the same time, half of the output torque is transmitted to the driven screw. Like all screw pumps, the external bearing type twin-screw pump also has the self-priming ability, and most pump conveying elements themselves are symmetrically arranged with a double suction, which can eliminate axial force and also have a large suction height.

The advantages of the twin-screw pump structure with external bearings greatly broaden the scope of use of the it, that is, in addition to transporting good lubricating media, it can also transport a large amount of non-lubricating media with various viscosities (the highest viscosity can reach 3. *106mm/s) medium and corrosive (acid, alkali, etc.) and abrasive liquids; in addition, the twin-screw pump is a non-sealed positive displacement pump due to its constant gap and the characteristics of the molding line. In addition to conveying pure liquid, it can also convey a mixture of gas and liquid, that is, gas-liquid mixed transmission, which is also one of the very unique advantages of the twin-screw pump;

The twin-screw pump can also run dry: because the moving parts do not contact each other during operation, the short-term dry running will not damage the pump components. This feature provides great convenience for the automatic control process, but the dry-running time is limited. A variety of factors limit, generally very short. In addition, this pump has no shearing and emulsification during the conveying process, so it will not destroy the molecular chain structure and the specific fluid properties formed in the working condition process, and because the transmission relies on synchronous gears, the pump operates with low noise and vibration. , work smoothly.

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