Broad medium three-screw pump

Abstract

A broad medium three-screw pump comprises a three-screw pump body and a hydrocyclone device. The hydrocyclone device comprises a spiral guide vane, a guide vane inner wall and a pump body lower end cover. A lining below an outlet of the three-screw pump body is fixedly connected with a pump body flange which is provided with an exhausting hole. The upper end of the guide vane inner wall is connected with the pump body flange, and the lower end of the guide vane inner wall is located above the lower end of the lining. The lining is sleeved with the guide vane inner wall and separated from the guide vane inner wall by a gap, and the cavity formed by the gap is connected with the exhausting hole of the pump body flange. The spiral guide vane is installed on the guide vane inner wall. The cross section of the pump body lower end cover is arc-shaped. An inlet of the three-screw pump body is located in the lateral surface of the pump body and located below the pump body flange. An inlet flange is an independent part, the outer ring of the inlet flange is sealed with the pump body, and the inner ring of the inlet flange is sealed with the lining. The outer side of the spiral guide vane isattached to the surface of the pump body inner wall. By means of the broad medium three-screw pump, bubbles in media are reduced at a lining inlet, the broad medium three-screw pump is suitable for more broad media mixed with bubbles, and the performance stability of the three-screw pump is improved.

Description

technical field [0001] The invention belongs to pumps, in particular to a wide medium three-screw pump. Background technique [0002] The screw pump is a positive displacement rotor pump, relying on the mutual meshing of the screws to transport the medium from the inlet to the outlet. Three-screw pumps are widely used in marine, petrochemical and other industries due to their advantages of high reliability, small size and low noise. The lubricating oil and fuel oil systems of ships have basically replaced piston pumps and gear pumps, and with the gradual development of high-pressure and large-flow three-screw pumps, three-screw pumps have also formed a huge advantage over twin-screw pumps in many industries. [0003] The three-screw pump belongs to the sealed screw pump in terms of structure classification. The driving rod and the driven rod mesh with each other in the screw bushing. The spiral groove space formed by the meshing can completely block the suction chamber and ...

AI Technical Summary

Problems solved by technology

However, due to the precise meshing process of the three-screw pump, the three-screw pump has high requirements on the medium. Transporting the medium mixed with solid particles or a large number of air bubbles will damage the three-screw pump or cause a significant drop in volumetric efficiency and increase noise.

The characteristic of poor adaptability to the medium greatly limits the application of three-screw pumps

For example, in petrochemical and other industries, although the flow rate of the three-screw pump can meet the actual needs, and its performance is better than that of the twin-screw pump, it is still difficult to replace the use of the twin-screw pump due to the characteristics of the medium.

Taking the shafting oil three-screw pump of a ship as an example, the performance of the actual application is often not up to the performance of the factory field experiment. In the actual application, the oil storage capacity of the circulating oil tank is small, and a large number of air bubbles will be mixed in the process of lubricating oil circulation. This also leads to a very bad working environment for the three-screw pump.

This makes the three-screw pump unable to work normally in the designed state, which greatly reduces the performance of the three-screw pump

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