Diaphragm pumps are relatively uncommon, so many people may not be very familiar with them. In terms of basic principles, there is no significant difference between QBY and DBY diaphragm pumps; the main distinction is that the QBY pneumatic diaphragm pump uses air as its power source, whereas the DBY electric diaphragm pump uses an electric motor. Today, pump our engineering team Co., Ltd. will explain the working principles and maintenance methods of the DBY electric diaphragm pump.
(I) Working Principle: A gear pump is a type of positive displacement pump consisting of two gears, a pump body, and front and rear covers that form two enclosed spaces. As the gears rotate, the volume of the space where the gear teeth disengage expands, creating a vacuum that draws in the liquid; conversely, the volume of the space where the teeth mesh contracts, forcing the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of the two gears. The discharge pressure of a gear pump depends entirely on the resistance at the pump outlet. A pair of meshing gears and the pump casing separate the suction chamber from the discharge chamber. As the gears rotate, the volume between the teeth on the suction side increases as the teeth disengage, lowering the pressure and allowing liquid to enter the spaces between the teeth. As rotation continues, the liquid trapped between the teeth is carried to the discharge chamber. There, the volume between the teeth decreases as they mesh, forcing the liquid out. Electric diaphragm pumps are suitable for transporting lubricating liquids that are non-corrosive, free of solid particles, and have a wide viscosity range. These pumps can achieve flow rates of up to 300 m³/h and pressures up to 3 × 10⁷ Pa. They are commonly used as hydraulic pumps and for transporting various types of oil. Electric diaphragm pumps feature a simple, compact structure; they are easy to manufacture and maintain and possess self-priming capabilities, though they do exhibit significant flow and pressure pulsations as well as high noise levels. A safety valve must be installed on the electric diaphragm pump to prevent damage to the pump or prime mover caused by the outlet pressure exceeding permissible limits—for instance, due to a blockage in the discharge pipe. (II) Maintenance Methods 1. Startup: (1) Before starting, check the sealing of all pipeline flanges and connections. (2) Rotate the coupling by hand to ensure there are no sounds of friction or collision. (3) For the initial startup, fill the pump with the fluid to be conveyed. (4) Fully open the valves in the suction and discharge pipelines before starting; starting with the valves closed is strictly prohibited. (5) Verify the motor's direction of rotation, then start the motor.
2. Shutdown: (1) Switch off the motor. (2) Close the pump's inlet and discharge valves.
Working Principles and Maintenance Methods of the DBY Electric Diaphragm Pump
We hope this proves helpful to you.