Xylem Patente

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The invention relates to a mixer machine assembly (1) and to a method for monitoring drive shaft assembly load of a mixer machine assembly. The mixer machine assembly comprises: a drive unit (2) that is part of the mixer machine, said drive unit (2) comprising an electric motor (7) and a drive shaft assembly (8) connected to and driven in rotation by said electric motor (7) during operation of the mixer machine assembly (1), a propeller (3) that is part of the mixer machine, said propeller (3) comprising a hub (15) connected to a propeller shaft (12) of the drive shaft assembly (8) and a plurality of blades (16) connected to said hub (15), wherein the propeller shaft (12) extends in an axial direction (Z) and the blades (16) extends in a radial direction, and a control unit (4) that is operatively connected to the electric motor (7), the control unit (4) being configured for monitoring and controlling the operation of the mixer machine. The method being characterized by the steps of: monitoring, by means of the control unit (4), a drive shaft torque (Tz) about a drive shaft (11) of the drive shaft assembly (8), determining, by means of the control unit (4), an average drive shaft torque range (ATzR) based on at least one drive shaft torque range (TzR), wherein each drive shaft torque range (TzR) is equal to the difference between the highest drive shaft torque value (Tz) about the drive shaft (11) and the lowest drive shaft torque value (Tz) about the drive shaft (11) detected during a predetermined angle of rotation (a) of the propeller (3) during operation of the mixer machine assembly (1), and comparing, by means of the control unit (4), the determined average drive shaft torque range (ATzR) with a predetermined torque range limit value (TzR).

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In a fist aspect the invention relates to a method for controlling a drainage pump (2), the drainage pump (2) comprising a drive unit having an electrical motor (7) and a drive shaft (8) and comprising a hydraulic unit having an impeller (9) operatively connected to said electrical motor (7) via said drive shaft (8), said drainage pump (2) being configured to be operated at a variable operational speed [rpm]. The method is characterized by the steps of continuously operating the drainage pump (2) at a positive operational speed, intermittently detecting whether the drainage pump (2) is snoring or not, decreasing the operational speed (OP) of the drainage pump (2) one step every time snoring is detected, and increasing the operational speed (OP) of the drainage pump (2) one step every time snoring is not detected. In a second aspect the invention also relates to a drainage pump assembly.

The invention relates to a submersible electric machine (2) for transporting a liquid, the submersible electric machine (2) comprising a hydraulic unit that comprises an impeller (12) configured for propelling the liquid, a drive unit that comprises a drive unit housing (17) defining a motor compartment (18), an electric motor (19) arranged in the motor compartment (18) and drive shaft (20) connected to the electric motor (19), the drive shaft (20) extending from the electric motor (19) to the hydraulic unit and being connected to the impeller (12), a top unit that comprises a top unit housing (23) defining an electronics chamber (24), the electronics chamber (24) being separated from the motor compartment (18) by a dividing structural wall (25), and a vibration sensor. The submersible electric machine (3) is characterized in that the vibration sensor is directly or indirectly connected to a partition (30) arranged in the electronics chamber (24), is configured to monitor vibrations in at least two dimensions [2D] and is configured to monitor vibrations at frequencies ranging up to 500 Hz, and in that the partition (30) is made of metal, is connected to the top unit housing (23) and has a natural frequency equal to or more than 500 Hz. The invention also relates to a system comprising at least one submersible electric machine (2).

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In a liquid treatment system with an inlet and an outlet defining a liquid flow direction from the inlet to the outlet, a liquid treatment zone arranged between the inlet and the outlet, the liquid treatment zone comprising a number of ultraviolet radiators arranged to radiate ultraviolet radiation into a liquid flowing through the treatment zone, a first transition zone downstream of the inlet and a second transition zone upstream of the outlet, which adapt the cross section of the inlet to the cross section of the treatment zone, and the cross section of the treatment zone to the cross section of the outlet, respectively, wherein the inlet, the transition zones, the treatment zone and the outlet confine the liquid flow in a closed channel, greater durability of the radiators and the channel wall material is achieved by providing a degassing between the inlet and the treatment zone at the top of the channel.

The invention relates to a device for generating ozone from oxygen-containing gas by silent electric discharge with electrodes which are installed in a nesting manner with at least two high-voltage electrodes (2,6,10) and at least one ground electrode (3,8,12), wherein between each high-voltage electrode (2,6,10) and ground electrode (3,8,12) a dielectric (4,5,9,11) is arranged, and wherein at least two discharge gaps (100) are formed, which are traversed by the gas, wherein a different voltage is applied to each single gap (100) according to the individual gap width.

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The invention relates to a water disinfection system comprising - a flow-through treatment chamber with an inlet and an outlet for the water in an open channel, the inlet and the outlet defining a flow direction of a flow of water, - a plurality of elongated ultraviolet lamps positioned parallel to each other in at least one array within said treatment chamber which at least one array is disposed at an acute angle with respect to and transverse to the flow of water so that the water must pass through the array, - a frame which holds in place the lamps of the array and which is constructed so that all lamps of the at least one array can be lifted out of the chamber simultaneously by lifting the frame, which is further improved in that - the frame is a stand-alone frame with a cuboid outer shape, the frame having in the direction of the flow of water: -- an upstream end with two vertical front frame members and two horizontal front frame members, -- a downstream end with two vertical rear frame members and two horizontal rear frame members, and -- a frame centre section with two lower side frame members and two upper side frame members, - wherein the at least one array is contained inside the cuboid shape and - wherein the frame is positioned in the chamber and has attachment elements for attaching the frame to a lifting mechanism.

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A de-blocking device for a hydraulic pump is disclosed. The de-blocking device comprises a can having a longitudinal axis and a conduit extending longitudinally along the longitudinal axis, the conduit having a first terminal aperture; a bearing fixedly positioned in the conduit spaced from first terminal aperture, a plunger axially movably positioned in the conduit between the bearing and the first terminal aperture,; and a biasing element positioned between the bearing and the plunger wherein the movement of the plunger toward the bearing compresses the biasing element.

The invention relates to a method for providing an axial gap in a cutter assembly of a grinder pump () in order to secure an operative shearing action at a shearing interface in said cutter assembly. The invention also relates to a shim suitable for providing said axial gap and a grinder pump () comprising such a shim. The grinder pump comprises a cutter wheel (5) connected to and driven in rotation by a drive shaft (16), the cutter wheel (5) comprising a set of cutting edges (13), and a cutter disc (6) stationary connected to a pump housing (3) and having a central hole (24) and a set of cutting holes (12), the drive shaft (16) and the cutter wheel (5) being interconnected via said central hole (24) of the cutter disc (6), wherein the cutter wheel (5) and the cutter disc (6) constitute said cutter assembly. The grinder pump is characterized in that a shim (27), that has a thickness equal to or greater than 0,05 millimeters and equal to or less than 0,15 millimeters and that is manufactured from degradable paper or plastic material, is clamped between the cutter wheel (5) and the cutter disc (6), wherein the grinder pump further comprises a locking member (26) acting against the cutter wheel (5) and the drive shaft (16) and fixating the axial gap between the cutter wheel (5) and the cutter disc (6) provided by said shim (27).

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