The difference between pneumatic diaphragm pump and single screw pump
There are significant differences between pneumatic diaphragm pumps and single screw pumps in many aspects, which are reflected in the following aspects:
1. Working principle:
Pneumatic diaphragm pump: Using compressed air as the power source, the compressed air is continuously filled or discharged from the diaphragm chamber by pneumatically controlling the opening and closing of the valve, thereby causing the diaphragm to reciprocally deform and realize the suction and discharge of liquid by the pump.
Single screw pump: relies on the mutual meshing of the screw and the bushing to produce volume changes in the suction chamber and discharge chamber to transport liquid. When the input shaft drives the rotor to perform planetary rotation around the center of the stator through the universal joint, the stator-rotor pair continuously meshes to form a sealed cavity. The volume of these sealed cavity does not change and moves axially at a uniform speed to transport the medium from the suction end through the stator. -The rotor pair is transported to the discharge end.
2. Driving mode:
Pneumatic diaphragm pumps: are pneumatic and driven by compressed air to complete the work without using electricity, reducing the risk of electric shock accidents.
Progressive cavity pump: Usually electric, requiring an electric motor to get the job done.
3.Features:
Pneumatic diaphragm pump:
No moving parts, no mechanical friction and wear, no need for regular maintenance and long service life.
There are no valves and mechanical seals, so problems such as clogging and wear will not occur.
It can transport various corrosive liquids, liquids with particles, high-viscosity liquids, and flammable, explosive and highly toxic liquids.
The flow and pressure can be controlled by adjusting the pressure of compressed air, and the operation is simple and convenient.
It has good self-priming performance, and the suction port of the pump can be directly placed below the liquid level to achieve self-priming.
However, the pneumatic diaphragm pump will produce obvious vibrations during operation and spread in the pipeline, so a vibration buffer device needs to be installed.
Single screw pump:
The size of the particles conveyed is only affected by the flow area, and low speed operation can handle larger solids with little wear due to the low operating speed.
No vibration, smooth and quiet operation.
Application areas:
Pneumatic diaphragm pumps are widely used in chemical, petroleum, food, pharmaceutical, paper and other industries due to their unique working principles and characteristics.
Single screw pumps have advantages in some situations where abrasive fluid or media containing larger particles need to be transported.
