Abstract: An impeller structure for a centrifugal pump that can feed both fibrous suspensions and water into a headbox of a fibrous web machine. The centrifugal pump utilizing the impeller structure pumps stock for both liquid-laid and foam-laid paper, tissue or board making applications and pumps water or other dilution fluid into a headbox circulation. In general, the impeller of the present invention is especially suitable for all such pumping tasks in the production of fibrous webs that a pulseless or low-pulse impeller is needed.

Abstract: An impeller structure for a centrifugal pump that can feed both fibrous suspensions and water into a headbox of a fibrous web machine. The centrifugal pump utilizing the impeller structure pumps stock for both liquid-laid and foam-laid paper, tissue or board making applications and pumps water or other dilution fluid into a headbox circulation. In general, the impeller of the present invention is especially suitable for all such pumping tasks in the production of fibrous webs that a pulseless or low-pulse impeller is needed.

Abstract: A mechanical seal includes a pair of slide rings and a spring. Each slide ring has an outer circumferential surface, an inner circumferential surface and slide or seal surfaces at one axial end. Each pair of slide rings has a rotating slide ring and a stationary slide ring, the slide or seal surfaces of each pair of slide rings being in sliding and sealing contact with each other. The inner circumferential surface of one rotating slide ring includes a device to form lock the slide ring, by direct mechanical contact to a hub or a shaft of the flow machine and at least one sealing surface at a side of the device is configured to form lock, each of the slide rings, when assembled to the flow machine supported, in an axial direction by a seal ring to one of the hub and the shaft of the flow machine.

Abstract: A rotor structure for a centrifugal flow machine includes working vanes attached to the hub of the rotor without any support disc or shroud. Additionally, the vane has a device for efficiently flushing the sealing chamber behind the rotor.

Abstract: The present invention relates to a centrifugal pump, a shaft sleeve and a stationary seal member for a static seal used in connection with a dynamic sealing of a centrifugal pump. The invention relates to a static seal the clearance of which may be adjusted while the pump is running. Especially the invention discusses the novel structure of such a static seal.

Abstract: A rotor structure for a centrifugal flow machine includes working vanes attached to the hub of the rotor without any support disc or shroud. Additionally, the vane has a device for efficiently flushing the sealing chamber behind the rotor.

Abstract: A mechanical seal includes a pair of slide rings and a spring. Each slide ring has an outer circumferential surface, an inner circumferential surface and slide or seal surfaces at one axial end. Each pair of slide rings has a rotating slide ring and a stationary slide ring, the slide or seal surfaces of each pair of slide rings being in sliding and sealing contact with each other. The inner circumferential surface of one rotating slide ring includes a device to form lock the slide ring, by direct mechanical contact to a hub or a shaft of the flow machine and at least one sealing surface at a side of the device is configured to form lock, each of the slide rings, when assembled to the flow machine supported, in an axial direction by a seal ring to one of the hub and the shaft of the flow machine.

Abstract: The present invention relates to a novel bearing arrangement for a centrifugal pump. The bearing arrangement comprises a thrust bearing (50) arranged closer to the end (42?) of the shaft (42) carrying the rotor (44), the thrust bearing (50) being selectable between a four-point contact ball bearing for heavy-duty applications and a single row contact ball bearing for light-duty applications.

Abstract: The present invention relates to a sealing arrangement for a flow machine. The sealing arrangement of the present invention is applicable for sealing bearing arrangements of centrifugal pumps, mixers, blowers etc. The present invention is especially applicable in sealing a bearing assembly including two angular contact ball bearings used in back-to-back configuration. The present invention relates especially to a baffle arranged between the bearing and the bearing housing, the baffle leaving a gap between itself and the inner bearing ring for the oil to flow from the bearing to the oil channel, and from the oil channel via a groove back to the oil chamber.

Abstract: Disclosed is a slide ring seal, which is used, for example, for sealing a shaft space of a centrifugal pump in relation to a pumping space thereof and to centering the mechanical seal and/or fastening the seal to the casing of the centrifugal pump and a body part used for the attachment. A feature of the disclosed seal, including at least one rotary slide ring unit, a body part by means of which the seal is attached to the casing, and at least one either separate counter ring unit or a counter ring unit stationarily attached to the body part, is that the body part is provided with inclined fastening means by means of which the body part (40, 40?) is tightened to the casing both axially and radially.

Abstract: The present invention relates to a centrifugal pump, a shaft sleeve and a stationary seal member for a static seal used in connection with a dynamic sealing of a centrifugal pump. The invention relates to a static seal the clearance of which may be adjusted while the pump is running. Especially the invention discusses the novel structure of such a static seal.

Abstract: The present invention relates to a new kind of a mechanical seal, a so called slide ring seal, which is used, for example, for sealing a shaft space of a centrifugal pump in relation to a pumping space thereof. The present invention especially relates both to centering said mechanical seal and/or fastening said mechanical seal to the casing of said centrifugal pump and a body part used for the attachment. A characterizing feature of a mechanical seal in accordance with the present invention, comprising at least one rotary slide ring unit (24, 24?, 24?), a body part by means of which said seal is attached to said casing (16), and at least one either separate counter ring unit (42, 42?) or a counter ring unit (42, 42?) stationarily attached to said body part, is that said body part (40, 40?) is provided with inclined fastening means (52), by means of which the body part (40, 40?) is tightened to the casing both axially and radially.

Abstract: The present invention relates to an agitator. The present invention especially relates to an agitator, which may be attached to the bottom, wall or cover of a mixing vessel. The agitator in accordance with the present invention is especially applicable to purposes where a relatively large and slowly rotating agitator is required. Thus, for example, agitators used in dilution vessels and the like of wood processing industry come into question. A characterizing feature of an agitator in accordance with the present invention is that the drive unit of the agitator comprises a disc (48) attached to an end of an agitator shaft (42) opposite to an agitator means (20), and a casing (50) surrounding said disc in such a way that the disc (48) is provided with permanent magnets operating together with coils (56) arranged to at least one wall (52, 54) of the casing (50) surrounding the disc (48) or in connection therewith forming a permanent magnet motor.

Abstract: The present invention relates to a centrifugal pump, a shaft sleeve and a stationary seal member for a static seal used in connection with a dynamic sealing of a centrifugal pump. The invention relates to a static seal the clearance of which may be adjusted while the pump is running. Especially the invention discusses the novel structure of such a static seal.

Abstract: The present invention relates to a centrifugal pump and an impeller thereof. The present invention especially relates to modifying an impeller of a centrifugal pump in such a way that the pump may be used without a risk of damaging a shaft seal or the like at capacities higher than that at the optimal operating point. A characterizing feature of a centrifugal pump, comprising a pump volute (2), a rear wall (4) of the pump, an impeller (20) having a shroud (22) and balancing holes extending through the shroud, the impeller being attached on the pump shaft (6) and rotating inside the volute (2), is that the balancing holes (26) are arranged through the shroud (22) in such a way that an opening (30) of the holes (26) in the front face of the impeller shroud (22) is both in the rotational direction and ahead of an opening (32) located in the rear face of the impeller shroud (22) and closer to the axis (8) of the pump than the opening (32) in the rear face of the impeller shroud (22).

Abstract: The present invention relates to a centrifugal pump and a static seal of the dynamic sealing thereof. The invention especially relates to modifying the attachment of said static seal and a seal cover acting as a counter ring thereof in such a way that, for example, when the static seal wears, the clearance thereof can be adjusted without a need to stop the pump. A characteristic feature of a centrifugal pump in accordance with the invention, comprising, among other things, a pump housing (72), a shaft (12), an impeller arranged on the shaft and a dynamic seal (30, 32) arranged in connection with the shaft (12), and a static seal arranged in connection with the shaft (12) behind the dynamic seal as seen from the impeller, said static seal comprising a flexible seal means (50) on the shaft (12) and a stationary counter ring thereof, is that a seal cover (62) including a stationary counter ring (60) is adjustable in the axial direction of the pump.

Abstract: The present invention relates to a new kind of a mechanical seal, a so called slide ring seal, which is used, for example, for sealing a shaft space of a centrifugal pump in relation to a pumping space thereof. The present invention especially relates both to centering said mechanical seal and/or fastening said mechanical seal to the casing of said centrifugal pump and a body part used for the attachment. A characterizing feature of a mechanical seal in accordance with the present invention, comprising at least one rotary slide ring unit (24, 24?, 24?), a body part by means of which said seal is attached to said casing (16), and at least one either separate counter ring unit (42, 42?) or a counter ring unit (42, 42?) stationarily attached to said body part, is that said body part (40, 40?) is provided with inclined fastening means (52), by means of which the body part (40, 40?) is tightened to the casing both axially and radially.

Abstract: The present invention relates to a centrifugal pump and an impeller thereof. The present invention especially relates to modifying an impeller of a centrifugal pump in such a way that said pump may be used without a risk of damaging a shaft seal or like at capacities higher than that at the optimal operating point. A characterizing feature of a centrifugal pump, comprising a pump volute (2), a rear wall (4) of said pump, an impeller (20) having a shroud (22) and balancing holes extending through said shroud, said impeller being attached on the pump shaft (6) and rotating inside said volute (2), is that said balancing holes (26) are arranged through the shroud (22) in such a way that an opening (30) of said holes (26) in the front face of the impeller shroud (22) is both in the rotational direction in ahead of an opening (32) located in the rear face of the impeller shroud (22) and closer to the axis (8) of the pump than the opening (32) in the rear face of the impeller shroud (22).

Abstract: A mixing device in the form of a centrifugal pump is used to mix gas (typically air) with liquid (typically effluent water, dispersion water, or waste paper pulp suspension, etc.). The pump is provided with a common inlet conduit for both the liquid and the gas so that liquid and gas flow freely and in an arbitrary ratio into the pump, that is there is no controlling or adjusting of the flows. The gas is allowed to either dissolve in the liquid or be mixed as small bubbles with the liquid, and any surplus gas is separated from the mixing device (e.g. by holes in the pump impeller leading to a rear portion of the pump which is attached to a vacuum source, such as a liquid ring pump). The liquid and gas dissolved therein, and small bubbles mixed therein, are discharged from the mixing device at a pressure that is raised from the inlet pressure, due to the action of the impeller, which pressure development enhances the dissolution of gas in the liquid.

Abstract: The present invention relates to a method and an apparatus for separating gas from solids-containing liquid. The apparatus in accordance with the invention may be applied in such places where air is separated from a medium by means of reduced pressure or vacuum condition. The apparatus in accordance with the present invention is especially applicable for the pulp and paper industry in situations where gas has been separated from the fiber suspension, but where the gas contains some fibers or other solids, which must be separated from the gas flow prior to the vacuum pump generating suction. The method in accordance with the present invention is characterized in that the fraction containing gas, liquid and solid material is passed from the pulp treatment apparatus to a separate separating apparatus, solids are separated from that fraction, which are then discharged from the separation apparatus.