Screw pump classification applicable and selection

Posted by uuuseff on November 18th, 2019

Screw pump is a positive displacement rotor pump, which is composed of the pump screw tooth shape and the formation of a plurality of sealed chamber displacement to suction and discharge liquid. There are no theoretical leakage channels between two adjacent sealed chambers in the screw pump, which are called strictly sealed screw pumps, whereas non-strictly sealed screw pumps.椐 The current practical application and relevant data show that the application of screw pump is very wide. It features smooth flow, small pressure pulsation, self-absorption, low noise, high efficiency, long life, small volume and reliable operation. Prominent advantage is that the transmission medium does not form a vortex, conveying a wide range of viscosity medium, can transport a variety of viscosity lubricity or corrosive media, but also can deliver a variety of viscosity non-Newtonian liquid, but also gas and liquid Mixed transport, solid-liquid mixed transport. It is widely used in offshore platform engineering, petrochemical, shipping, electric power, mechanical hydraulics, food, paper, sugar, military and sewage treatment and other industrial sectors. In the words of the sales manager at Arvind, Germany: "There is no medium in the world that can not be delivered by a screw pump." The screw pump can convey any medium. Certainly not to say that a particular type of screw pump can deliver all of the media, but different types of screw pumps can be selected depending on the characteristics of the media and the number of performance parameters. Screw pump according to the number of the screw is usually divided into single screw pump, double, triple and five screw pump, each have their own advantages, the promotion of the use of screw pump must have the choice, only to make full use of their respective characteristics in order to better achieve energy saving, section Material, benefit or meet some special requirements. Single-screw pump sleeve is made of non-metallic elastic material (usually rubber), the hole is spiral groove shape, with a helical metal screw to form a number of sealed chamber. Metallic screw for eccentric rotation, so that the seal cavity by the pump low-pressure area displacement to the high-pressure zone, the completion of inhalation, the liquid discharge and the formation of the entire process of pressure. In addition to the general medium, the single screw pump can deliver suspensions and special media containing metal particles, fibers, etc. In the treatment of sewage, mud, commonly used single-screw pump, usually working pressure is not high. The traditional twin-screw pump is a non-strictly sealed type screw pump. The pump sleeve made of metal material has two phase-cut cylindrical cavities. Two screw rods in the cavity are meshed with each other. Between the formation of a number of sealed chamber. Screw for rotational movement, the sealed chamber by the pump low-pressure zone displacement to the high-pressure zone. There are single helix, there are double helix twin screw pump, lubrication medium, if the screw angle is large enough, the main screw can directly drive the sub-screw. If accompanied by synchronous gear, in theory, there can be no contact between the two screws. Although the traditional twin-screw pump is not strictly sealed and the working pressure is not high, it can transport a wide range of media with a wide range of viscosities and can deliver non-Newtonian liquids of various viscosities. Therefore, all industries have great interest in it, especially the petroleum and chemical industries.

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