Abstract: A hyperboloid agitator for circulating liquids, in particular water, wastewater or the like, in the centre of which a connection portion (2) for connection to a hollow agitator shaft (1) is provided, characterised in that the hyperboloid agitator is formed as a hollow body, with a central aperture (3) for supplying air being provided in the connection portion (2), and in that an air distribution device (9, 10, 11) for distributing air supplied through the aperture (3) to a plurality of air outlet openings (14) provided in the hollow body is provided downstream of the aperture (3).

Abstract: An apparatus for aerating bodies of water includes a floating platform, a motor supported by the floating platform, a transmission which is coupled to the motor and whose output shaft is in the form of a hollow shaft, a fan for supplying air through an air supply line connected thereto, wherein the air supply line is connected to one end of the hollow shaft, a hollow stirring shaft coupled to the other end of the hollow shaft, an stirrer affixed to the free end of the approximately vertical stirring shaft, wherein the stirrer is designated as a hollow body and has a central opening through which air supplied by the stirring shaft can pass, and a multiplicity of air outlet openings.

Abstract: The invention relates to a propeller, which is intended to be fastened to a shaft in a clamping manner, the shaft having a driver profile extending in the axial direction, wherein: the propeller is formed from multiple elements, each element (A, B, C, D) having a hub portion (1) with a counter profile (2) corresponding to the driver profile; a first connection portion (3) and a propeller blade (4) extending from the first connection portion (3) are formed on one side of the hub portion (1), and a second connection portion (5) is formed on the opposite other side of the hub portion (1); the first connection portion (3) is designed to bear interlockingly against a further second connection portion (5) of an adjacent further element (A, B, C, D); and, when the elements (A, B, C, D) are connected such that their connection portions (3, 5) bear against one another, the hub portions (1) of all the elements (A, B, C, D) complement one another to form a hub surrounding the shaft in an interlocking manner.

Abstract: A hyperboloid agitator for circulating liquids, in particular water, wastewater or the like, in the centre of which a connection portion (2) for connection to a hollow agitator shaft (1) is provided, characterised in that the hyperboloid agitator is formed as a hollow body, with a central aperture (3) for supplying air being provided in the connection portion (2), and in that an air distribution device (9, 10, 11) for distributing air supplied through the aperture (3) to a plurality of air outlet openings (14) provided in the hollow body is provided downstream of the aperture (3)

Abstract: An apparatus for aerating bodies of water, comprising a floating platform (19), a motor (15) supported by the floating platform (19), a transmission (16) which is coupled to the motor (15) and whose output shaft is in the form of a hollow shaft (17), a fan for supplying air through an air supply line (18) connected thereto, wherein the air supply line (18) is connected to one end (E1) of the hollow shaft (17), a hollow stirring shaft (1) coupled to the other end (E2) of the hollow shaft (17), an stirrer (K) affixed to the free end of the approximately vertical stirring shaft (1), wherein the stirrer (K) is designated as a hollow body and has a central opening (3) through which air supplied by the stirring shaft (1) can pass, and a multiplicity of air outlet openings (14).

Abstract: The invention relates to a horizontal agitator for producing a flow in a clarifier, a submersible motor (1) and a propeller (3) drivingly connected thereto forming an assembly unit (M), wherein a receiving portion (A) for removably attaching the assembly unit (M) is provided and can be supported on the bottom (Bo) of the clarifier, and wherein a guide for guiding the assembly unit (M) along a substantially vertical movement path between a surfacing position above a maximum nominal sewage level (N) defined for the clarifier and the receiving portion (A) is provided. In order to improve the efficiency of the horizontal agitator and to reduce complexity of manufacture, the guide is formed by at least one first cable (S) extending between the surfacing position and the receiving portion (A).

Abstract: A rotary disc filter device includes a rotor rotatable about an axis of rotation, having a plurality of disc-shaped filter members. Each disc-shaped filter member has two walls extending outwardly form the axis of rotation. At least one of the walls has the form of a frustum.

Abstract: A rotary disc filter device includes a rotor rotatable about an axis of rotation. The rotor includes a plurality of disc-shaped filter members, each disc-shaped filter member having a frame. The frame is made of sheet metal elements which are connected with each other by rivets.

Abstract: The invention relates to a horizontal agitator for producing a substantially horizontal flow in a wastewater treatment tank, a propeller being installed on a polygonal shaft driven by means of a submersible motor, wherein the propeller is produced form a first material, which is formed from a polymer reinforced with first fibers, and as hub has a sleeve which corresponds to the outer shape of the polygonal shaft and which is produced from a second material which is different from the first material.

Abstract: A rotary disc filter device includes a rotor rotatable about an axis of rotation. The rotor includes a plurality of disc-shaped filter members, each disc-shaped filter member having a frame. The frame is made of sheet metal elements which are connected with each other by rivets.

Abstract: A rotary disc filter device includes a rotor rotatable about an axis of rotation, having a plurality of disc-shaped filter members. Each disc-shaped filter member has two walls extending outwardly form the axis of rotation. At least one of the walls has the form of a frustum.

Abstract: The invention relates to a horizontal agitator for producing a flow in a clarifier, a submersible motor and a propeller drivingly connected thereto forming an assembly unit, wherein a receiving portion for removably attaching the assembly unit is provided and can be supported on the bottom of the clarifier, and wherein a guide for guiding the assembly unit along a substantially vertical movement path between a surfacing position above a maximum nominal sewage level defined for the clarifier and the receiving portion is provided. In order to improve the efficiency of the horizontal agitator and to reduce complexity of manufacture, the guide is formed by at least one first cable extending between the surfacing position and the receiving portion.

Abstract: The invention relates to a horizontal agitator for producing a substantially horizontal flow in a wastewater treatment tank, a propeller being installed on a polygonal shaft driven by means of a submersible motor, wherein the propeller is produced form a first material, which is formed from a polymer reinforced with first fibres, and as hub has a sleeve which corresponds to the outer shape of the polygonal shaft and which is produced from a second material which is different from the first material.

Abstract: The invention relates to a drive device for the immersed operation below a surface of a liquid (F), particularly for the immersed operation in a clearing basin, having a drive shaft (5) guided out of a housing, wherein the drive shaft (5) is guided through an axial face seal (12, 13) received in a sealing chamber (10) for sealing the housing against penetrating liquid. In order to improve the service life of the seal, the invention provides that a line (22) is connected to the sealing chamber (10) for receiving an oil supply and is guided to above the surface of the liquid (F).

Abstract: The invention relates to a drive device for the immersed operation below a surface of a liquid (F), particularly for the immersed operation in a clearing basin, having a drive shaft (5) guided out of a housing, wherein the drive shaft (5) is guided through an axial face seal (12, 13) received in a sealing chamber (10) for sealing the housing against penetrating liquid. In order to improve the service life of the seal, the invention provides that a line (22) is connected to the sealing chamber (10) for receiving an oil supply and is guided to above the surface of the liquid (F).