What are Rotary Pumps?
Rotary pumps rely on the rotation of one or more rotors in the pump to suck and discharge liquid, also known as rotor pumps.
- There are many forms of rotary pumps, but their operating principles are similar. Gear pumps and screw pumps are more commonly used in chemical plants. Type of rotary pump
- 1. The delivery flow can be controlled more accurately; the flow of the centrifugal pump cannot be controlled, and the increase in resistance will cause the flow to decrease. 2. The material being conveyed is stable, no destructive effect, and the speed is low; the centrifugal pump has a high speed, which produces impact force, bubbles, etc. 3. Can transport high viscosity materials. 4. High indenter, suitable for long-distance high-resistance quantitative conveying. 5. The structure is simple and easy to fold and wash. 3. Disadvantages: complicated production, high accuracy and high cost. 4. Material: Beverage (condensed milk, syrup, chocolate), fruit concentrate (ketchup, jam), paste (meat paste, fat). V. Rotary pump: Rotor pump, gear pump (syrup, grease), sliding vane pump, screw pump.
- Twin screw pump
Rotary Pump Single Screw Pump
- The single screw pump is mainly composed of screw, pump casing and universal joint. The single-screw pump rotor is a circular cross-section screw.It has a planetary motion in a specially shaped bushing (stator) on the one hand, and advances the liquid along the internal thread of the stator, and continuously moves from the suction cavity to the pressure Cavity, the fluid in the cavity is axially uniform, without vortex and agitation.
- Single screw pump is a kind of internal meshing sealed volume pump. With the same displacement, pressure and speed, double-head screw pump has the characteristics of smaller volume and lighter weight than single-head screw pump. The single screw pump has the advantages of compact structure, small radial size, no pulsation of pressure and fleas, low noise, strong self-priming performance, and small agitation when conveying media.It can be used to convey liquids containing solid particles, acid and alkali salt liquids, various A variety of liquids of different viscosities, pulp, soft green, slop oil, mud, cement mortar, etc., widely used in environmental protection, biological engineering, sewage treatment, mining, petrochemical, food, sugar, pharmaceutical, papermaking, dyes, construction and other industries . The German company Kieberg is a world leader in the design, manufacture, application, performance and efficiency of single screw pumps.
Rotary Pump Twin Screw Pump
- The twin screw pump is composed of a driving screw (main rod), a driven screw (slave rod), a pump body, a safety valve, a coupling, a filter, a synchronous gear and a rolling bearing. The two screws (rotor) of the twin-screw pump are engaged with each other and run in the bushing (stator), which sucks in and discharges fluid depending on the volume change of the sealed cavity formed. The fluid flows axially uniformly without turbulence and agitation. The rotor and stator of the twin-screw pump are made of rigid materials, and their manufacturing accuracy is higher than that of the single-screw pump. According to the suction method, the twin screw pump can be divided into single suction and double suction. For single-suction twin-screw pumps and single-suction five-screw pumps, a hydraulic balance device for balancing axial forces should be considered. Double-suction twin-screw pump, the pump body is equipped with two left and right-handed single-screw screws, the axial force on the screw is self-balancing. The master rod drives the slave rod to rotate through an external synchronous gear (outer support type). The rotation of the slave rod does not rely on the meshing transmission of the master rod. The gap between the two screws and the screw and the pump body is ensured by gears and bearings.
Rotary Pump Triple Screw Pump
- The three-screw pump is mainly composed of a main rod, two slave rods, and a pump casing containing three screws. The thread of the master rod is convex double-headed, and the thread of the slave rod is concave double-headed. The spiral directions of the two are opposite. The main rod of the three-screw pump drives two slave rods through meshing. The three screws (rotors) mesh with each other and run in the bushes, and rely on the volume change of the sealed cavity formed to suck and discharge fluid. The fluid moves axially uniformly in the pump cavity without vortex and agitation. The profile of the screw pump is usually formed by the cycloid, so it is called the cycloid meshing screw pump. The three-screw pump has a small meshing clearance, a pressure of 25 MaP, a low noise of 57 dB () ^, and a high efficiency, which is especially suitable for high pressure and small flow fluid transmission. Its processing accuracy is higher than that of single screw pump and double screw pump. The disadvantage is that due to the small gap between the rotors and between the rotor and the stator, the medium cannot contain solid particles.
Rotary pump five screw pump
- The pump casing of the double-suction five-screw pump is equipped with five left and right-handed double-screw screws, and the axial force on the screw is automatically balanced. There is an involute on the tooth profile of the screw, which plays the role of transmitting motion from the master rod to the slave rod. . Both ends of the screw are equipped with rolling bearings to ensure the clearance between the screw and the pump sleeve. For single-suction five-screw pumps, a hydraulic balancing device that balances axial forces needs to be considered. The five-screw pump is a non-sealed positive displacement pump with low pressure (below IMaP). It is only used for special occasions with limited installation space (such as on ships) as a lubricant pump [2] .