Xylem Patente

The invention relates to a submersible semi-axial centrifugal pump (1) for installation in a column (2), and comprises an outer pump housing (7) and an inner pump core arrangement (14). The pump core arrangement comprises a drive unit (16), a semi-axial open centrifugal impeller (20) and a plurality of guide vanes (15) extending between and connecting the pump housing (7) and the drive unit (16), wherein the impeller (20) comprises a hub (28) and at least two spirally swept blades (29), wherein the hub (28) is essentially cone-shaped tapering towards the inlet (12) of the pump housing (7). Each blade (29) comprises a leading edge (31), a trailing edge (32) and a lower edge (33). The outer pump housing (7) comprises a diffuser (9), connected to the stationary drive unit (16) via the radially extending guide vanes (15), and an inlet funnel (8), fixedly connected to the diffuser (9), wherein the semi-axial centrifugal pump (1) comprises a pump housing liner (38), located between the outer pump housing (7) and the lower edge (33) of the impeller (20), wherein the pump housing liner (38) is displaceable in the axial direction in relation to the outer pump housing (7) in order to adjust a radial gap (39) between the pump housing liner (38) and the lower edge (33) of the impeller (20).

The invention relates to a submersible semi-axial centrifugal pump (1) for installation in a column (2), and comprises an outer pump housing (7) and an inner pump core arrangement (14). The pump core arrangement comprises a drive unit (16), a semi-axial open centrifugal impeller (20) and a plurality of guide vanes (15) extending between and connecting the pump housing (7) and the drive unit (16), wherein the impeller (20) comprises a hub (28) and at least two spirally swept blades (29), wherein the hub (28) is essentially cone-shaped tapering towards the inlet (12) of the pump housing (7). Each blade (29) comprises a leading edge (31), a trailing edge (32) and a lower edge (33). The leading edge (31) of each blade (29) is swept backwards from an inner end (36) located at the hub (28) towards an outer end (37) located at the inner surface (11) of the pump housing (7), wherein a centre axis (A) of the impeller (20) is located at a relative radius R* equal to 0 and the outer end (37) of the leading edge (31) of each blade (29) of the impeller (20) is located at a relative radius R* equal to 1, and wherein a sweep angle (α) of the leading edge (31) is in the range 32 - 45 degrees at a first relative radius R*1 equal to 0,5, and in the range 47 - 60 degrees at a second relative radius R*2 equal to 0,95, and is continuously increasing from the first relative radius R*1 to the second relative radius R*2.

The present invention relates to a centrifugal pump (1) comprising a drive unit (2) having an electric motor (3) and a drive shaft (4), a hydraulic unit (5) connected to the drive unit (2). The centrifugal pump further comprises an impeller (10) connected to the drive shaft (4) and located in a volute (9). The centrifugal pump (1) further comprises a sealing arrangement (13-14) connected to the housing (8) and configured for sealing between the impeller (10) and the housing (8). The centrifugal pump is characterized in that the seal member (13) is displaceable in the radial direction in relation to the clamping member (14), wherein the seal member (13) comprises a first engagement means (15) and the clamping member (14) comprises a second engagement means (16) configured to cooperate with the first engagement means (15) of the seal member (13), and wherein the sealing arrangement (13-14) has a play in the rotational direction between the first engagement means (15) and the second engagement means (16) whereby the seal member (13) is displaceable in the circumferential direction in relation to the clamping member (14) an angle α that is equal to or less than ± 3 degrees.

The invention relates to a method for monitoring and controlling the operation of a liquid flow generator (1) configured for operation in a tank (18) housing in a liquid comprising solid matter. The flow generator (1) comprises a propeller (3) and a main body (7) having a drive unit (4), wherein a control unit (4) is operatively connected to the flow generator (1) in order to monitor and control the operation of the flow generator (1), the method comprises the steps of: a) driving the propeller (3) in a normal direction of rotation, wherein the liquid flow is directed from an upstream side of the propeller (3) towards a downstream side of the propeller (3), wherein the main body (7) is located at the upstream side of the propeller (3), b) performing a cleaning sequence in response to a main body cleaning signal, wherein the cleaning sequence comprises the steps of: i) stopping the propeller (3) from rotating in the normal direction of rotation, ii) driving the propeller (3) in a reverse direction of rotation, wherein the liquid flow is directed from the downstream side of the propeller (3) towards the upstream side of the propeller (3) and along the main body (7) in order to remove any solid matter accumulated on the main body (7), and iii) stopping the propeller (3) from rotating in the reverse direction of rotation, c) resume driving of the propeller (3) in the normal direction of rotation.

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The invention relates to a hydraulic unit of a pump (1) configured for pumping liquid comprising solid matter, said hydraulic unit comprising a housing (6) and an impeller seat (5), said housing (6) having an axial inlet opening (2) and an outlet opening (3) and said impeller seat (5) having an axial inlet defined by an inlet wall (10), wherein the impeller seat (5) has an inlet radius (R) measured from an axially extending centre axis (A) to the circular intersection (11) between the inlet wall (10) and the upper surface (12) of the impeller seat (5), said impeller seat (5) comprising a guide pin (13) connected to and extending radially inwards from said inlet wall (10), the guide pin (13) having a tip radius (r) measured from the axially extending centre axis (A) to the radially innermost part of the guide pin (13), wherein an imaginary 15%-circle (23) is offset radially inwards from said circular intersection (11) fifteen percent of the difference between said inlet radius (R) and said tip radius (r), said housing (6) comprising a cut water (28), wherein a cut water line (29) is a radius of the impeller seat (5) tangent to the most downstream point of the cut water (28). The hydraulic unit is characterized in that the cut water line (29) is located downstream a radius of the impeller seat (5) that is perpendicular to the outlet opening (3), and in that a guide pin angle (µ) between the cut water line (29) and a radius of the impeller seat (5) intersecting a leading edge of the guide pin (13) at the 15%-circle (23), is equal to or more than 3 degrees and equal to or less than 25 degrees.

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The invention relates to a method for controlling a flow generator (1) in a tank (20) configured for housing a liquid comprising solid matter, the flow generator (1) comprising an impeller and being located at a height (h-mixer) in the tank (20) and the tank (20) having a predetermined maximum filling height (h-max), wherein the flow generator (1) is configured to be operated at a variable operational speed (n) and the demand of operational speed (n-demand) is dependent on the present liquid level height (h-present) in the tank (20), wherein a max operational speed (n-max) of the flow generator (1) is the operational speed required when the liquid level in the tank (20) is equal to the maximum filling height (h-max), the present operational speed (n-present) being set equal to the demand of operational speed (n-demand) of the flow generator (1) that is determined using the formula: n−present=n−demand=−−−−−−−−−−h−max/h−present∧an−max at least when [(h-mixer) + X] ≤ (h-present) ≤ (h-max), wherein a ≥ (1/4) and a ≤ 2, X = radius of the impeller of the flow generator + 1, and all heights and measures are given in meter.

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The invention relates to an impeller seat (5) for a pump, said impeller seat (5) having an inlet wall, wherein the impeller seat (5) has an inlet radius measured from an axially extending centre axis (A) to the circular intersection (11) between the inlet wall and the upper surface (12) of the impeller seat (5), said impeller seat (5) comprising a guide pin (13) connected to and extending radially inwards from said inlet wall, the guide pin (13) having a tip radius measured from the axially extending centre axis (A) to the radially innermost part of the guide pin (13), wherein an imaginary 40%-circle (25) is offset radially inwards from said circular intersection (11) forty percent of the difference between said inlet radius and said tip radius. The impeller seat (5) is characterized in the guide pin (13) comprises a leading edge (26) configured for scraping off pollutants from an impeller of the pump (1), wherein the guide pin (13), at least between the inlet wall (10) and the 40%-circle (), comprises a pre-leading edge (31) located upstream the leading edge (26) of the guide pin (13), seen in the direction of rotation of the pump (1) and seen in the axial direction. The invention also relates to a pump comprising such an impeller seat.

The invention relates to an impeller seat (5) for a pump, said impeller seat (5) having an inlet wall, wherein the impeller seat (5) has an inlet radius measured from an axially extending centre axis (A) to the circular intersection (11) between the inlet wall and the upper surface (12) of the impeller seat (5), said impeller seat (5) comprising a guide pin (13) connected to and extending radially inwards from said inlet wall, the guide pin (13) having a tip radius measured from the axially extending centre axis (A) to the radially innermost part of the guide pin (13), wherein an imaginary 15%-circle (23) is offset radially inwards from said circular intersection (11) fifteen percent of the difference between said inlet radius (R) and said tip radius (r), the impeller seat (5) comprising a feeding groove (14) arranged in the upper surface (12) of the impeller seat (5) and extending from the inlet wall (10) to the periphery of the impeller seat (5). The impeller seat (5) is characterized in that a groove inlet upstream edge line (34) is a radius of the impeller seat (5) intersecting an upstream edge (35) of the feeding groove (14) at said circular intersection (11), seen in the direction of rotation of the pump (1), wherein a groove inlet upstream edge angle (λ) between a radius of the impeller seat (5) intersecting an upstream edge of the guide pin (13) at the 15%-circle (23), seen in the direction of rotation of the pump (1), and the groove inlet upstream edge line (34) is equal to or less than 20 degrees and equal to or more than 0 degrees. The invention also relates to a pump comprising such an impeller seat.

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The invention relates to a method for priming of a pump (1) in response to a priming condition, wherein the priming comprises the steps of:- confirming that the liquid level in the reservoir (20) is located at the same level or above the upper portion of the impeller (8),- driving the impeller (8) in a reverse direction of rotation, wherein the duration of the reverse operation of the impeller (8) is equal to or more than 2 seconds and equal to or less than 5 seconds,- stopping the impeller (8) from rotating in the reverse direction of rotation,- driving the impeller (8) in a forward direction of rotation,- detecting, during the forward operation of the impeller (8), whether too much gas is present in the volute (10), and- in response to detection of too much gas in the volute (10), stopping the impeller (8) from rotating in the forward direction of rotation and returning to the step of driving the impeller (8) in the reverse direction of rotation, and in response to non-detection of too much gas in the volute (10), exiting the priming of the pump (1).

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The invention relates to an open impeller (7) and a submergible pump configured for pumping liquid comprising abrasive matter and comprises such an open impeller (7). The open impeller (7) comprising a cover plate (11), a centrally located hub (12) and at least two spirally swept blades, each blade comprising a leading edge (14) adjacent the hub (12) and a trailing edge (15) at the periphery of the impeller (7) and a lower edge (16), wherein the lower edge (16) extends from the leading edge (14) to the trailing edge (15) and separates a suction side (17) of the blade from a pressure side (18) of the blade, and wherein the lower edge (16) is configured to be facing and located opposite a wear plate of said submergible pump, at least one blade comprising a winglet (19) at the lower edge (16), wherein the winglet (19) is connected to and projects from the suction side (17) of said at least one blade. The open impeller (7) is characterized in that said winglet (19) is located radially outside an inner radius of the impeller (7) and extends in the circumferential direction to the trailing edge (15) at the suctions side (17) of the blade located at a maximum radius (r_max) of the impeller (7), said winglet (19) has a lower wear surface (20) configured to be facing and located opposite the wear plate of the submergible pump, wherein said inner radius is equal to the largest of: the maximum radius (r_max) of the impeller (7) multiplied by 0,6, and an inlet radius of the impeller (7) multiplied by 1,2, wherein the inlet radius is taken at the interface between the leading edge (14) of the blade and the lower edge (16) of the blade at the suction side (17) of the blade.

The invention relates to an device for generating ozone from oxygen-containing gas by silent electric discharge with an electrode arrangement (1) with at least one high-voltage electrode (4,8) and at least one annular ground electrode (5) wherein between the at least one high-voltage electrode (4,8) and the at least one ground electrode (5) a annular dielectric (6,7) is arranged, wherein the at least one high-voltage electrode (4,8) is surrounded by at least one annular heat pipe (12).

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The invention relates to a propeller for a digestion tank mixer. Each blade (6) of the propeller (4) has an outer geometrical plane that is parallel to a center axis (A), perpendicular to a radius of the propeller (4) and intersects both a leading edge (11) and a trailing edge (12) of the blade (6), and an inner geometrical plane that is parallel to the outer geometrical plane and that is tangent to the hub (5). The propeller is characterized in that at each intermediate geometrical plane (Y) the blade (6) has an arc-shaped cross section that extends between the leading edge (11) and the trailing edge (12), and a chord (13) that extends between the leading edge (11) and the trailing edge (12), wherein an angle (α) between the chord (13) and a radial plane of the propeller (4), is equal to or greater than 25 degrees and equal to or less than 45 degrees in each intermediate geometrical plane (Y), and wherein the ratio between an arc-height [AH] between the chord (13) and the thrust side surface (7) and the length of the chord [C], AH:C, is equal to or greater than 0,08 and equal to or less than 0,15 in each intermediate geometrical plane (Y).