Abstract: A differential rate rotary thickener; a power detector which is disposed in a sludge receiver tank for thickened sludge thickened in the differential rate rotary thickener; a discriminator which receives an electric signal for a thickened sludge concentration detected by the power detector and which calculates and discriminate the data; a first controller which receives an instruction signal being a discriminated result in the discriminator and which operates an outer cylinder driving machine and a screw driving machine; a ratio setter which receives a discriminated signal of the discriminator and which increases or decreases a chemical feed rate of flocculant stepwise; and a second controller which receives an instruction signal from the ratio setter and which operates a flocculant-feeding pump are provided. Thickening of sludge is performed by controlling the chemical feed rate, a rotational speed of a screw, and a rotational speed of an outer cylinder screen.

Abstract: A differential rate rotary thickener; a power detector which is disposed in a sludge receiver tank for thickened sludge thickened in the differential rate rotary thickener; a discriminator which receives an electric signal for a thickened sludge concentration (X) detected by the power detector and which calculates and discriminate the data; a first controller which receives an instruction signal being a discriminated result in the discriminator and which operates an outer cylinder driving machine and a screw driving machine; a ratio setter which receives a discriminated signal of the discriminator and which increases or decreases a chemical feed rate (?) of flocculant stepwise; and a second controller which receives an instruction signal from the ratio setter and which operates a flocculant-feeding pump are provided. Thickening of sludge is performed by controlling the chemical feed rate (?), a rotational speed (S) of a screw, and a rotational speed (C) of an outer cylinder screen.

Abstract: [Solving Means] A differential rate rotary thickener; a power detector which is disposed in a sludge receiver tank for thickened sludge thickened in the differential rate rotary thickener; a discriminator which receives an electric signal for a thickened sludge concentration detected by the power detector and which calculates and discriminate the data; a first controller which receives an instruction signal being a discriminated result in the discriminator and which operates an outer cylinder driving machine and a screw driving machine; a ratio setter which receives a discriminated signal of the discriminator and which increases or decreases a chemical feed rate of flocculant stepwise; and a second controller which receives an instruction signal from the ratio setter and which operates a flocculant-feeding pump are provided. Thickening of sludge is performed by controlling the chemical feed rate, a rotational speed of a screw, and a rotational speed of an outer cylinder screen.

Abstract: A differential rate rotary thickener; a power detector which is disposed in a sludge receiver tank for thickened sludge thickened in the differential rate rotary thickener; a discriminator which receives an electric signal for a thickened sludge concentration (X) detected by the power detector and which calculates and discriminate the data; a first controller which receives an instruction signal being a discriminated result in the discriminator and which operates an outer cylinder driving machine and a screw driving machine; a ratio setter which receives a discriminated signal of the discriminator and which increases or decreases a chemical feed rate (?) of flocculant stepwise; and a second controller which receives an instruction signal from the ratio setter and which operates a flocculant-feeding pump are provided. Thickening of sludge is performed by controlling the chemical feed rate (?), a rotational speed (S) of a screw, and a rotational speed (C) of an outer cylinder screen.

Abstract: In order to provide a high-head, large-delivery turbopump adapted for excellent suction performance and foreign matter passability by having characteristics of an inducer, axial flow vanes, and mixed flow vanes imparted together to centrifugal vanes, a progressively diameter-increased suction casing rear part has arranged therein an impeller configured with two to four rotary vanes wound around a hub, to define rotary channels having a vane outlet channel width of 26% in proportion to a vane inlet outer circumference diameter, the rotary vanes being each respectively configured as a collision-less connection of an upstream axial-flow screw part provided with an inducer part extending into a suction fluid path of a suction casing front part at a vane inlet angle of 14°, an intermediate mixed-flow screw part, and a downstream centrifugal screw part.

Abstract: Rotary vanes having inducer-joined axial-flow vane portions, mixed-flow vane portions collisionlessly connected to the axial-flow vane portions, and centrifugal vane portions collisionlessly connected to the mixed-flow vane portions are wound around an outer peripheral surface of a hub that is continuously curved. The hub is configured with a moderate slope region and a steep slope region. The axial-flow vane portions and the mixed-flow vane portions are wound around the moderate slope region, and the centrifugal vane portions being wound around the steep slope region.

Abstract: An outboard motor which includes a driving motor, a switching device, an impeller and a blade casing. The switching device switches rotation of a drive shaft of the driving motor between normal and reverse directions. The impeller is rotated with a driven shaft connected to the switching device. The blade casing includes a first duct member and a second duct member. The first duct member has first opening through which water is sucked from the outside when the impeller is rotated in the normal direction. The second duct member connected to the first duct member encloses the impeller, and has a second opening through which water is sucked from the outside when the impeller is rotated in the reverse direction.

Abstract: A propelling machine (2) is configured curved- tubular, on a ship bottom (1b), with a front casing (12) having a suction inlet (11) opening fore to water, an impeller casing (10) having an impeller (17) inscribed thereto, and a rear casing (14) having a delivery outlet (13) opening aft to water, and the impeller (17) is forward and reverse rotatable.

Abstract: A vessel propulsion system having a suction casing (4) configured with a suction inlet (4a) opening at a vessel bottom (1b), a suction flow path (4b) inclined to rearwardly ascend from the suction inlet (4a), and an impeller chamber (4c) formed horizontal, and disposed at a bottom of a stern, a delivery casing (10) connected to the suction casing (4) and submerged under a draft of the stern, and a set of forward and reverse rotatable axial flow blades (8) disposed in the impeller chamber (4c) of the suction casing (4).

Abstract: In a screw press, an outer tube (5), over which a screen (4) is tensioned, is divided into a freely rotatable condensing zone at the front half thereof, and a filtering and dewatering zone at the rear half thereof, a freely rotatable screw shaft (7) is provided within the thus-divided outer tube (5a, 5b), filtered fluid is separated from sludge supplied to the starting end of the condensing zone by the screen (4) of the outer tube (5a), and a cake is removed at a discharge port (29) at the rear end of the outer tube (5b) of the filtering and dewatering zone. A sludge supply path (28) is provided in the screw shaft (7), a supply hole (28a) of this supply path (28) is formed at the starting end of the outer tube (5a) of the condensing zone, and a scraper (33) extends on the outer periphery of a screw vane (6) from the starting end to the ending end.

Abstract: A screw press apparatus has frames, a screw shaft, an outside tube, a cylindrical screen, a screw blade, a supply pipe, and a cleaning pipe. The screen is fixed between the frames to the outside tube, and has a plurality of fine holes and covers the screw shaft. The screw shaft and the screen define a cylindrical space continuously extending from an upstream region to a downstream region. Raw liquid is fed from the supply pipe via an opening of the screw shaft to the upstream region of the cylindrical space. The cleaning pipe ejects cleaning water onto the screen. Sizes of the fine holes of the screen decrease gradually from the upstream region towards the downstream region.

Abstract: A continuous compression-type dewatering apparatus has a filter chamber (3), a drive shaft (17), a vane (15), and a supply path (50). The filter chamber (3) is delineated by an annular plate (2) and two side plates (1, 1). The drive shaft (17) passes through the center axis of the annular plate (2) and through the inside of the filter chamber (3), and is free to rotate with respect to the filter chamber (3). The vane (15) is disposed within the filter chamber (3), is fixed with respect to the drive shaft (17), and rotates in concert with the drive shaft (17). The supply path (50) passes through the drive shaft (17) and supplies raw fluid to the filter chamber (3). The vane (15) as two side edges (15a, 15a) facing the side plates (1, 1) and an end edge (15b) facing the annular plate (2). The side plates (1, 1) include a screen (4) for separating the raw fluid into a filtered fluid and a cake. The annular plate (2) includes an ejection port (7) for the cake.

Abstract: Water jet ejection nozzles (2, 3, 4) different in ejection bore diameter or controllable of ejection bore diameter are arranged in a vertically spacing manner and fluid paths connected to the ejection nozzles are provided with open-close valves (6, 7, 8) to be individually controlled, or a water jet ejection nozzle (50; 60) having a controllable ejection bore diameter is vertically driven, for water jet propulsion to be in accordance with a varied draft position of a vessel.

Abstract: A blockage preventing apparatus used for a water jet propulsion unit (2) is provided with a screen (6), springs (22), an engagement protrusion (21) and an engagement end portion (20a). The screen (6) is rotatably supported with respect to the front end of a suction port (7) and movable between a closed position at which the screen covers the suction port (7) and an open position shifted downward from the suction port (7). The springs (22) urge the screen (6) to the closed position through a working shaft (17). The engagement protrusion (21) is provided at the working shaft (17) and moves together with the screen (6). The engagement end portion (20a) moves from the first position and moves beyond the second position. When the engagement end portion (20a) moves from the first position to the second position, the engagement end portion (20a) is engaged with and presses the engagement protrusion (21) to thereby move the screen (6) from the closed position to the open position.

Abstract: A pump frame (7) is secured to a bottom (1b) of a ship in such a manner that a lower opening (19) is opened into water adjacent to a stern (1a) of the ship. A mixed flow pump (8) is secured to a frame (12) provided for the bottom (1b). A suction opening (26) of the mixed flow pump (8) is connected to a connection opening (17) in the upper portion of the pump frame (7). A discharge pipe (13) is connected to a discharge opening (27)) of the mixed flow pump (8). An impeller shaft (33) is horizontally extended in a pump casing (9) of the mixed flow pump (8). The impeller shaft (33) is provided with an impeller (11) for sucking and pressurizing water below the bottom (1b) through an introduction opening (19). Water pressurized by the impeller (11) is jetted to the rear of the stern through the discharge pipe (13) so that a ship (1) is propelled. The foregoing water jet propulsion apparatus (5) enables sucking performance free from cavitation and excellent propelling performance to be obtained.

Abstract: A pump frame (7) incorporates an upper opening (17), a lower opening (19) and a water passage (21) for connecting the two openings. To cause the lower opening (19) to be opened in water at a position adjacent a stern (1a) of a ship (1), the pump frame (7) is joined to a bottom (1b) of a ship (1). A pump casing (9) is secured to be stood erect above the pump frame (7). The pump casing (9) includes an impeller main shaft (33) stood erect. The impeller main shaft (33) is provided with an impeller (11) for sucking water from below the bottom (1b) through the lower opening (19) so as to pressurize the water. Water pressurized by the impeller (11) is jetted to a position behind the stern (1a) through a discharge pipe (13). As a result, the ship (1) is propelled. The foregoing water jet propulsion apparatus (5) enables sucking performance free from cavitation and excellent propelling performance to be obtained.

Abstract: A water jet propulsion device for a vessel in which a suction inlet 4 is open at a vessel bottom part in a vicinity of a stern, water suctioned from the suction inlet 4 to a suction duct 5 is pressurized by a spiral blade 10 provided in an impeller housing 6, and jet water is ejected from an ejection duct 13 backward of the stern, and moreover, on an impeller shaft 7 provided in the impeller housing 6 are disposed a plurality of those spiral blades 10 with slipped phases, outer peripheral parts 10b of the spiral blades 10 are close to an inner circumferential surface of the impeller housing 6, and outer circumferential end parts 10c of the spiral blades 10 are extended to a suction side, and further in a fluid passage behind the spiral blades 10 are provided guide vanes 12, and cavitations and a rolling of a vessel body in a high-speed travelling are reduced, and a travel performance is improved.

Abstract: A vibration rod for simultaneously vibrating upper-portion support bars arranged to be upwards brought into contact with two ends of the upper-portion support bar to simultaneously vibrate the upper-portion support bars is disposed below the bar for supporting the upper portion of each of filter clothes each of which is disposed between filter plates; and washing pipes each having nozzles pointed to the filter cloth from a position above a gap between filter plates are disposed above the filter plates disposed in parallel so that cakes allowed to adhere to the filter clothes are separated by vibrating the filter plates simultaneously with opening of all of the filter plates. Then, washing water sprayed from the nozzles enables all of the filter clothes to simultaneously be washed and regenerated.

Abstract: Since a filter unit is formed by causing an upper portion support bar for a filter cloth put on a filtering surface of a filter plate to be engaged to a washing pipe integrally provided for the filter plate, a filtering mechanism portion of a filter press can easily be formed by mounting the filter units by a predetermined number. Moreover, the operation control and maintenance of the filter press can easily be performed.