The structure of the external meshing double electric diaphragm pump dby electric diaphragm pump A pair of intermeshing gears and a pump cylinder separate the suction chamber from the discharge chamber. When the gear rotates, the volume between the teeth at the side of the suction chamber where the teeth disengage from each other gradually increases, the pressure decreases, and the liquid enters the space between the teeth under the action of the pressure difference. As the gear rotates, the liquid between the teeth is brought to the discharge chamber. At this time, the volume between the teeth of the gear teeth on the discharge chamber side gradually decreases, and the electric diaphragm pump is suitable for conveying lubricating liquids that do not contain solid particles, are non-corrosive, and have a large viscosity range. The flow rate of the pump can reach 300 m3/h, and the pressure can reach 3 x 107 Pa. It is usually used as a hydraulic pump and transports various oil products. The electric diaphragm pump has a simple and compact structure, is easy to manufacture, and is easy to maintain. The working principle and limitations of the Qby pneumatic diaphragm pump have self-priming ability, but the flow and pressure fluctuate greatly and the noise is large. The electric diaphragm pump must be equipped with a safety valve to prevent damage to the pump or the prime mover due to some reasons, such as the blockage of the discharge pipe and the outlet pressure of the pump exceeding the allowable value.

 Working principle
The gear pump is a kind of positive displacement pump. It consists of two closed spaces consisting of two gears, the pump body, and the front and rear covers. At large, a vacuum is formed, and the volume of the space on the meshing side of the gear is sucked into the liquid from large to small, and the liquid is squeezed into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of two gears.
The pressure at the outlet of the gear pump depends entirely on the resistance at the pump outlet.