Patent ID: 9587372
Date: 2017-03-07
CPC Classifications: E02F,F04D

Claim:
1. Dredging apparatus configured to remove sediments from a bed of an expanse of water in absence of any contact with the bed, comprising a suction apparatus including: a) a submersible pump including: b) a suction head associated to said inlet mouth of the housing body of the pump and provided at the bottom with a suction opening of the sediments; wherein the suction opening of the head has a value of the cross-section area dimensioned to achieve in a working range of the pump a suction speed capable of removing the sediments by means of the fluid dynamics removal action carried out by the water sucked into said head; wherein the dredging apparatus further comprises a separating device for separating a slurry of water and sediments discharged from the suction apparatus in a liquid phase and a solid phase including the sediments and a recirculation system to the suction head of at least a part of the liquid phase separated by said separating device; and wherein the suction head is provided with an inner hollow space defining a radially outer annular portion of the suction opening, said radially outer annular portion of the suction opening being in liquid communication with the recirculation system and being configured to feed the liquid phase separated by the separating device towards the suction opening and inside the suction head.