The suction nozzles cleaning system is certainly the most frequently used for filtration of fine particles, as it is a very efficient system and does not require flow interruption during the cleaning.
When the differential pressure gauge reaches the pre-set pressure difference between filter inflow and outflow, a signal is triggered and the cleaning starts. The suction nozzles (1) are located inside the filtering element. They are separated by a spacing mesh and connected to the atmospheric pressure via the nozzles holder manifold (2) and the discharge valve (3). The difference in pressure between the inside of the filter and the atmosphere creates the suction power needed to perform the cleaning of the filtering element (4). During the cleaning cycle, the nozzles rotate powered by the electric motor (5) inspecting and cleaning the entire surface of the filtering element. Dirt is removed through the discharge valve (3) installed on the filter.
Our continuous research on the fluid dynamics of the suction nozzle lead us to optimize the suction efficiency and allowed us to reach 0.5 bar pressure washing for the two-dimensional mesh and 1 bar pressure for the three-dimensional mesh, with extremely low water consumption. Average length of the cleaning cycle is 15 sec.
The spacing mesh is key to the filtering element. Its shape determines the suction effectiveness and its thickness defines the maximum size of the infeed particles.