Talking about the advantages and disadvantages of gear pump and screw pump
A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gear to deliver or pressurize the liquid. The two gears, the pump body and the front and rear covers form two closed spaces. When the gear rotates, the volume of the space on the disengagement side of the gear increases from small to large, forming a vacuum, sucking the liquid, and the volume of the space on the gear meshing side changes from large to large. Small, and the liquid is squeezed into the pipeline.
The suction chamber and the discharge chamber are separated by the meshing lines of the two gears. The pressure at the discharge port of the gear pump is completely dependent on the resistance at the pump outlet. A screw pump is a positive displacement rotor pump that draws in and discharges liquid by means of a volume change of a sealed chamber formed by a screw and a bushing. The screw pump is divided into single screw pumps, double, triple and five screw pumps according to the number of screws. The screw pump is characterized by stable flow, small pressure pulsation, self-priming capability, low noise, high efficiency, long life and reliable operation.
The outstanding advantage is that it does not form eddy current when transporting the medium, is not sensitive to the viscosity of the medium, and can transport high viscosity medium. Advantages and disadvantages of the gear pump The advantages of the gear pump: reliable structure, stable operation, low cost, can transport viscous medium such as non-corrosive oil; the pump itself has a safety valve, and the conveying medium has a high pressure head. Disadvantages of gear pumps: Not suitable for conveying liquids containing solid particles and liquids with high volatility and low flash point.
The gears in the pump are prone to wear during long-term operation; the flow rate of the conveying medium is small. Advantages and disadvantages of the screw pump, the advantages of the screw pump: compact structure, basically no pulsation of flow and pressure, and high pressure, stable operation, low vibration and noise compared to the gear pump; long life, high efficiency, suitable liquid type and Wide range of viscosities. Disadvantages of the screw pump: high manufacturing and processing requirements, working characteristics are sensitive to viscosity changes, and the flow rate of the conveying medium is small.
