Single screw pump selection gist and principle contrast

Screw pump is a positive displacement rotor pump. Unique structure, self-priming capacity, high efficiency, small volume, reliable operation, can be wide range of conveyor viscosity of various media. Screw pump is divided into single screw pump, twin screw pump, three screw pump, etc. , and their working principle is what? What are the characteristics? Selection of methods and techniques are also each are not identical, in the face of a single screw pump selection to introduce the main points; Screw pump working principle is the use of screw rotary to absorb liquid. The middle screw to active screw, the prime mover, on both sides of the screw is driven screw, with the active screw do reverse rotation. Mesh of the screw, the screw work closely with liner wall between the inlet and outlet of the water pump, can be divided into one or more of the sealed space. With the rotation of the screw and meshing, the sealed space in pump suction side form unceasingly, the liquid from the suction chamber seal in among them, and since the suction chamber along the screw axial continuously goes on to the discharge end, will be closed in the space of the liquid discharge. A, single screw pump single screw pump is a new kind of method of rotary displacement pump. The main working parts are eccentric screw ( Rotor) And fixed bushings ( The stator) 。 Compared with other pumps, single screw pump has its own unique advantages: compared with centrifugal pump, single screw pump doesn't need to install the valve, the flow is stable linear flow. Compared with plunger pump, single screw pump has better self-priming capacity. Compared with diaphragm pump, single screw pump can transport all kinds of mixing impurities, medium containing gas and solid particles or fiber, also can transport all kinds of corrosive substances. Compared with the gear pump, single screw pump can transport high viscosity material. And plunger pump, diaphragm pump and the gear water pump, single screw pump can be used in the pharmaceutical filling and metering. Two screw pump, screw pump selection is used widely, & other; Screw pump can transport any medium & throughout; The claim. But this is not to say that a certain kind of screw pump can deliver all medium, but according to the requirements of the medium characteristic and the performance parameters of several different types of screw pump can be selected. If accidentally choose the wrong screw pump, the pump is likely to lead to unnecessary trouble. Single screw pump, double, three and five screw pump, each have advantages, must have a choice in popularization and application of screw pump, only take full advantage of the characteristics of their own, to better achieve energy saving, material saving and increasing benefits or satisfy some special requirements. Three, the key points of single screw pump selection of single screw pump selection focuses on the following parameters: 1, single screw pump pressure to determine: single screw pump output pressure is based on liner series bushing ( The stator) On the number of lead to determine: 1st, high working pressure of 0. 6 MPa； Level 2: high work pressure of 1. 2 MPa； Level 4: high working pressure of 2. 4 MPa； Due to the transmission medium is different, for medium containing serious wear and tear ', according to the requirements of delivery pressure to select suitable stator series. 2, the choice of single screw pump speed: single screw pump because of its structure characteristics, most used in the transmission of high viscosity liquid and liquid containing particles, so the choice of the revolution is critical. The main basis for the selection of single screw pump speed medium wear and the medium viscosity. 3, performance: the general performance of the single screw pump table or characteristic curve are in 20 ℃ water as medium, Viscosity is 1 CST) When data for conveying flow under different viscosity and shaft power is different. 4, shaft seal: according to the need and transmission medium, can adopt mechanical seals and packing seal, and these two kinds of structure are interchangeable. 5, pump drive mode: because of the single screw pump for low speed pumps, water pump drive mode is more, generally have low speed motor straight league ( 6, 8) , driven gear reduction motor, stepless variable speed motor drive, etc. 6, selection of single screw pump bushing rubber materials: single screw pump bushing for rubber products, is also one of the single screw pump parts, it is the choice of good or bad, directly affect the service life of bushing and normal life of the lining sleeve for the cases for 3 - 6 months, if choose undeserved, bushings may be falling off or rubber from the steel pipe. 7, material selection, different medium, different material combinations. Four, can be seen from the above principle, can more clearly understand the advantages of screw pump: 1, a wide range of pressure and flow; Wide range of delivery and type of liquid viscosity; 2, because the rotary inertia force component inside the pump is low, so it can be used in high speed; 3, inhaled can good, self-priming ability; 4, flow uniformly continuous, little vibration, low noise; 5, compared with other rotary pump, less sensitive to enter gas and dirt; 6, solid structure, installation and maintenance easy. 7, accordingly, the disadvantages of screw pump is obvious: the screw processing and assembling the demand is higher; The performance of the pump is more sensitive to the viscosity of the liquid change.
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