The invention is an aero-acoustic comminution apparatus which includes an aero-acoustic comminution machine 10 having a cyclone chamber 12 with an inlet 14 for the material to be comminuted and an inlet 16 for the air. An electric motor 18 coupled to a shaft 20 to which an impeller 22 is coupled rotates the impeller 22 within an impeller housing 24 to draw the air and the entrained material to be comminuted into the cyclone chamber 12 and through an axial inlet system 26 into the impeller 22 and impeller housing 24 and to expel the comminuted material through the impeller housing 24 radially through a transverse outlet. The invention extends to a method of comminuting an ore material using said aero-acoustic comminution apparatus as well as an organic material. The invention further extends to aero-acoustic materials processing plant including said aero-acoustic comminution apparatus and further comprising an enclosure surrounding the aero-acoustic including sound attenuation panels having 4 or more layers which include a plasticised film.

A grinder accessory is useful for a pump in a wastewater application. The grinder accessory has a cutter plate and a cutting body that co-act on solids, especially fibriform solids. The cutter plate has first and second planar faces, mounted in an inlet of the pump, with a plurality of through holes and a central aperture. The cutting body is poised atop the first planar face and extends through the central aperture to rotationally couple with a drive shaft of the pump. A central hub of the cutting body has a plurality of arms that extend radially proximate to the first planar face, so that a leading edge of the arms interacts with the through holes on solids passing therethrough. A housing defines a cutting chamber around the cutter plate and the cutting body to protect them and to induce swirling action.

A wastewater pump for conveying solids-laden wastewater includes a spiral housing with an inlet opening, an impeller with at least one vane having a leading edge running from the impeller hub in a backwardly curved manner, and at least one finger for wiping off contaminants from the leading edge. The at least one finger is arranged on the inlet inner wall and extends in the direction of the impeller rotational axis. At least one groove is present in a suction-side inner wall of the housing to receive and convey material that is removed by the at least one finger from the leading edge to. The leading edge of the impeller and the surface of the at least one finger which faces toward the leading edge are at an angle of 5° to 75° with respect to the rotational axis.

A stator for a helical gear device includes a first section having first helically convoluted chamber with a set of radially inwardly extending lobes and a second section adjacent to the first section. The second section includes a stack of cutter disks. Each cutter disk includes a front surface, a rear surface, an interior surface defining a central opening extending from the front surface to the rear surface, a forward cutting edge, and a rearward cutting edge. The interior surface forms a same number of lobes for the central opening as the set of radially inwardly extending lobes in the first section. Each cutter disk is aligned along a common centerline, and each cutter disk is rotated slightly relative to each other to form a second helically convoluted chamber with a same pitch as the first helically convoluted chamber. The second helically convoluted chamber exposes, to materials passing through, portions of the forward cutting edge or the rearward cutting edge of each cutter disk.

A pump assembly and components therefor including an impeller which has flow inducer elements on an inner surface of a front shroud thereof, a flow directing device or strainer having passageways for delivering material to the impeller and at least one flow circulating passageway and a pump casing having an intake section with flow distribution vanes in the region of a feed opening adjacent the intake section.

The invention is based on pump system (10), in particular a self-suction pump system, with a liquid conveying unit (12) for conveying a liquid (56) and with a vacuum pump unit (14) which is, at least in an initial operation state, configured to supply the liquid conveying unit (12) with the liquid (56).

In order to improve a construction, it is proposed that at least in the initial operation state, the vacuum pump unit (14) is configured to transport a gas along the liquid conveying unit (12).

An impeller for pumping fluid that comprises discharge flow paths that allow high pressure liquid to be used to flush out low pressure gas that can accumulate within the internal structure of the impeller. The impeller comprises transition regions, vanes, and at least one discharge flow path. The vanes are rotational about a central axis. The transition regions and the plurality of vanes have a high pressure flow path and a low pressure flow path. The at least one discharge flow path is in fluid communication with a section of the low pressure flow path of at least one of the transition region(s) and the vane(s).

A split volute for a centrifugal pump is disclosed that provides a manufacturing advantage by improving the yield of high-chrome iron casting, providing for full surface coating capability using line-of-sight spray coating systems. Performance improvements include improved pump efficiency, abrasion resistance, and volute lifetime. Additional operational cost savings are enabled through reduced time required for common volute maintenance procedures and an increased replacement interval for the volute. Taken together, these advantages reduce the total cost of ownership of the split volute pump system.

A chopper pump including a drive section having a drive shaft, and a housing coupled to the drive section and having an inlet, an outlet, and an internal cavity arranged between the inlet and the outlet. The chopper pump further includes an impeller received within the internal cavity and coupled to the drive shaft for rotation therewith. The impeller includes a recess formed therein. The chopper pump further includes a cutting insert received within the recess of the impeller. The cutting insert includes a cutting groove axially recessed into the cutting insert. The chopper pump further includes a cutting plate coupled to the housing within the internal cavity. The cutting plate includes a cutting extension that extends radially inward. Rotation of the impeller rotates the cutting blade past the cutting extension.

A rotary part for a pump and related systems and methods are provided. The rotary part can be rotated in a forward direction about a rotation axis X-X and may include shroud(s) and expelling vane(s). The expelling vane(s) may have a leading side facing in the forward direction characterised in that the leading side includes a forwardly inclined section which is inclined forwardly.