Screw pump is divided into single screw pump, twin screw pump, three screw pump. This article describes in detail their structure, characteristics, performance parameters, the difference between the four aspects of the application, as well as their advantages and disadvantages. Such as single-screw pump structure for the single-headed male screw rotors in a special double-headed female screw rotors eccentric (stator is soft), can swing back and forth along the pump center line with the stator always maintain engagement, twin screw pump structure There are two screw shafts of the same size, one is a driving shaft, one is a driven shaft, and a synchronous rotation is achieved through gear transmission. Single Screw Pump Construction: The single-headed male screw rotor rotates eccentrically within a special double-headed female screw stator (the stator is soft), swings back and forth along the pump centerline, and remains engaged with the stator. Features: 1, can transport liquid containing solid particles 2, can be used for almost any viscosity of the fluid, especially for high viscosity and non-Newtonian fluid 3, the working temperature is limited by the stator material Performance parameters: flow up to 150m3 / h, the pressure can be Up to 20MPa Application: For molasses, pulp, starch paste, chocolate paste, paint, tar, paraffin, grease, mud, clay, clay and so on. Twin Screw Pump Structure: There are two same-size screw shaft, a drive shaft, a driven shaft, through the gear drive to achieve synchronous rotation. Features: 1, the screw and the pump body, and between the screw to maintain 0.05 ~ 0.15mm gap, wear small, long life 2, the packing box only by suction pressure less leakage 3, compared with the three screw pump, the impurities are not sensitive Performance parameters: the pressure is about 1.4MPa, viscous liquid maximum 7 MPa, the viscosity of the liquid up to 3 MPa, the flow is generally 6 ~ 600m3 / h, the maximum 1600 m3 / h liquid viscosity of not more than 1500mm2 / s Application Occasions: For lubricating oil, grease, crude oil, asphalt, fuel oil and other highly viscous oils. Three screw pump structure: by a driving screw and two engaged with the driven screw formed. Features: 1.Active screw directly drives the driven screw without gear transmission. The structure is simple. 2.The pump itself is used as the screw bearing, no need to install the radial bearing. 3. The screw does not bear the bending load and can be made very long. Can get high pressure 4, should not be transported with more than 600μm solid impurities in liquid 5, high-speed operation, is a small high-flow pump, high volumetric efficiency 6, stuffing box only with suction pressure, leakage less performance parameters: pressure Up to 70 MPa, flow up to 2000m3 / h. Suitable viscosity of 5 ~ 250 mm2 / s medium. Applications: suitable for transporting lubricating oil, heavy oil, light oil and crude oil. Can also be used for glycerol and viscose and other highly viscous liquid delivery.
