Abstract: The gravel-or-the-like removing device includes an impeller casing which accommodates an impeller driven by a motor in the inside thereof and has a suction opening at the center of the lower surface, a peripheral wall for preventing collapse and inflow of gravel or the like which is constituted of a cylindrical body which has an upper end thereof connected to a lower portion of the impeller casing and a lower end thereof opened downwardly and forms a water-retention space in the inside thereof, and a water suction pipe which has an upper-end opening thereof opened in water above a gravel-or-the-like piled level and a lower opening thereof communicably connected with the water retention space.

Abstract: An underwater agitation pump comprises an impeller casing in which an impeller driven by a motor is rotatably accommodated, an agitated material suction guide cylinder of a hollow cylinder which has one-end opening portion thereof integrally communicably connected to a center suction opening portion of the impeller while passing through a center opening of the impeller casing and having the other-end opening portion thereof extended downwardly, the suction guide cylinder further forming an agitated material suction passage therewithin, and an agitator mounted on an outer peripheral portion of the other-end opening portion of the agitated material suction guide cylinder. Due to such a constitution, the agitated material suction passage formed in the inside of the agitated material suction guide cylinder can ensure a sufficiently wide agitated material inflow area.

Abstract: The gravel-or-the-like removing device includes an impeller casing which accommodates an impeller driven by a motor in the inside thereof and has a suction opening at the center of the lower surface, a peripheral wall for preventing collapse and inflow of gravel or the like which is constituted of a cylindrical body which has an upper end thereof connected to a lower portion of the impeller casing and a lower end thereof opened downwardly and forms a water retention space in the inside thereof, and a water suction pipe which has an upper-end opening thereof opened in water above a gravel-or-the-like piled level and a lower opening thereof communicably connected with the water retention space.

Abstract: An underwater agitation pump can suck soil, sand or the like which contains block-like material or string-like material in a dredging site or the like while efficiently agitating such soil, sand or the like and thereafter can discharge such sand, soil or the like to a desired place. The underwater agitation pump comprises an impeller casing in which an impeller driven by a motor is rotatably accommodated, an agitated material suction guide cylinder being constituted of a hollow cylinder which has one-end opening portion thereof integrally communicably connected to a center suction opening portion of the impeller while passing through a center opening of the impeller casing and having the other-end opening portion thereof extended downwardly, the agitated material suction guide cylinder further forming an agitated material suction passage in the inside thereof, and an agitator which is mounted on an outer peripheral portion of the other-end opening portion of the agitated material suction guide cylinder.

Abstract: The present invention relates to an underwater pump which is characterized by mounting a stationary flexible-piece-winding preventing member, such as a stationary sleeve, on an outer periphery of a portion of a rotating shaft of a rotary motor where a rotating head such as an agitator is mounted. Due to such construction, the winding or adhesion of a flexible piece to the rotary-head mounting portion can be effectively prevented.

Abstract: A device for processing fluid containing solid bodies is provided which comprises a separation tank with a strainer arranged therein, a fluid discharging suction unit connected to one side of the strainer, and a solid discharge mechanism connected to the other side of the strainer, whereby fluid containing solid bodies such as sludge is processed effectively through separation.

Abstract: A device for controlling the pressure at shaft-sealing parts of an apparatus, wherein pressure equal to an external pressure around the apparatus is established in an interconnect chamber as well as in a motor chamber so as to equalize pressures applied on the shaft-sealing parts disposed between an impeller chamber and the interconnect chamber and between the interconnect chamber and the motor chamber. Due to the above, the apparatus can eliminate any damages which may occur in the shaft-sealing parts of a conventional apparatus used in a pressurized atmosphere.

Abstract: An underwater sand pump has an extremely improved sand excavating efficiency by eliminating the occurrence of cavitation and by preventing interference between the agitation flow and the suction flow. Such underwater pump is substantially characterized by disposing flow separating means in a circular opening formed in an end plate of a perforated strainer and by mounting such flow separating means integrally and contiguously on the upper end of the agitator which is mounted on the lower extension of the output shaft of a motor.

Abstract: Transferring a material from a first location to a second location while suspended in a fluid includes providing a stream of a pressurized fluid and an arcuate circulation path for admixture of the material and fluid, introducing at least a portion of the pressurized fluid from the stream into the circulation path and also introducing the material into the circulation path. The mixture of pressurized fluid and material is returned to the stream of pressurized fluid and conveyed to the second location.

Abstract: A fan for use with pumps for pumping up sand from the bottom of a body of water having certain uniquely shaped vanes around the circumference of a truncated cone.