Abstract: When, according to the invention, constructing a drive system for rotating a cleaning head in a tank and allowing the system to comprise a hysteresis coupling having two magnetic parts, one being present inside the liquid space (4) and the other outside the liquid space, respectively, a completely liquid-tight separation between the housing (2) and a gear (14) may be ensured. The magnetic part (8, 18) of the hysteresis coupling may be formed by electromagnets, and with a displaceable (13) position of one part relative to the other part (11, 19), the coupling may be adjusted with respect to the transferred torque and/or speed.

Abstract: To ensure that liquid and/or vapors do not escape from a tank space during cleaning by means of cleaning equipment, a housing (2) is provided with magnetic coupling equipment according to the invention, comprising two cooperating pole elements (8,9) which extend hermetically isolated from each other with pole parts extending in the turbine housing (3) on the tank space side and the gear housing (1) itself outside the tank space, respectively. This provides a considerable degree of security against liquid and gas leakage, while making it possible to achieve a compact structure with easy access for service and maintenance.

Abstract: To achieve complete cleaning of a tank (11) by means of a cleaning head (4, 5) having nozzles (6) mounted on a liquid supply pipe (3), the cleaning head (4) according to the invention is provided with one or more nozzle openings, nozzles (7), which eject a jet/jets (8, 9) against the supply pipe/suspension (3). This ensures that the stationary parts of the cleaning equipment (3, 10) are cleaned effectively during the turning (4a) of the cleaning head (4) and thereby of the nozzle/nozzles (7).

Abstract: In order to deliver supplies of liquid for irrigation of a cleaning head, a turnable part of the cleaning head housing and a nozzle hub (4) are mounted directly in a stationary part (2) of the housing to the turnable part (3) by forming slide bearings therebetween made of materials such as AISI316L and Nitronic60, preferably with at least one bearing having parts (15, 20) made of the same material. Liquid can flow through gaps (9, 14) provided between the slide bearing parts, reducing the consumption of liquid used for irrigating an exterior of the cleaning head, while creating a strong film of liquid which settles on the exterior surface.

Abstract: When, according to the invention, a cleaning head is provided with a hysteresis coupling (9, 11) between the turbine (3) and the gear in the gear housing (13), the gear will remain separated from the turbine and not be subjected to liquid impact. The hysteresis coupling (9, 11) may be adjusted using electromagnets (9) as an inductor, which allows control/regulation of the rotating movements of the cleaning head to achieve the best possible cleaning pattern.

Abstract: When, according to the invention, constructing a drive system for rotating a cleaning head in a tank and allowing the system to comprise a hysteresis coupling having two magnetic parts, one being present inside the liquid space (4) and the other outside the liquid space, respectively, a completely liquid-tight separation between the housing (2) and a gear (14) may be ensured. The magnetic part (8, 18) of the hysteresis coupling may be formed by electromagnets, and with a displaceable (13) position of one part relative to the other part (11,19), the coupling may be adjusted with respect to the transferred torque and/or speed.

Abstract: When, according to the invention, a cleaning head is provided with a hysteresis coupling (9, 11) between the turbine (3) and the gear in the gear housing (13), the gear will remain separated from the turbine and not be subjected to liquid impact. The hysteresis coupling (9, 11) may be adjusted using electromagnets (9) as an inductor, which allows control/regulation of the rotating movements of the cleaning head to achieve the best possible cleaning pattern.

Abstract: To achieve complete cleaning of a tank (11) by means of a cleaning head (4, 5) having nozzles (6) mounted on a liquid supply pipe (3), the cleaning head (4) according to the invention is provided with one or more nozzle openings, nozzles (7), which eject a jet/jets (8, 9) against the supply pipe/suspension (3). This ensures that the stationary parts of the cleaning equipment (3, 10) are cleaned effectively during the turning (4a) of the cleaning head (4) and thereby of the nozzle/nozzles (7).

Abstract: By constructing tank cleaning equipment according to the invention such that it comprises a cleaning jetting part (7, 9) as well as a suction part (4), the equipment can work with the same cleaning medium which is recirculated. This saves supply of fresh cleaning medium, and since used medium is thus not discharged, it is not necessary to establish deposit facilities to avoid pollution. Furthermore, this equipment according to the invention may advantageously be used for keeping so-called drilling mud in a mixed and thus ready-to-use state, even when left to stand for an extended period of time in a tank. The nozzle jets (10) thus keep the mud in the tank in a constantly mixed state, and the mud can therefore be sucked through the suction pipe (20) for pumping in the drill pipe, it being ensured that the mud is homogeneous and has a suitable viscosity.

Abstract: In order to deliver supplies of liquid for irrigation of a cleaning head, a turnable part of the cleaning head housing and a nozzle hub (4) are mounted directly in a stationary part (2) of the housing to the turnable part (3) by forming slide bearings therebetween made of materials such as AISI316L and Nitronic60, preferably with at least one bearing having parts (15, 20) made of the same material. Liquid can flow through gaps (9, 14) provided between the slide bearing parts, reducing the consumption of liquid used for irrigating an exterior of the cleaning head, while creating a strong film of liquid which settles on the exterior surface.

Abstract: When, according to the invention, constructing a drive system for rotating the cleaning head in a tank and allowing the system to comprise a hysteresis coupling having two magnetic parts which are present inside the liquid space (4) and outside this, respectively, a completely liquid-tight separation between the housing (2) and the gear (14) may be ensured. The magnetic part (8, 18) of the hysteresis coupling may be formed by electromagnets, and with a displaceable (13) position of the one part relative to the other part (11, 19) the coupling may be adjusted with respect to the transferred torque and/or speed.

Abstract: To ensure that liquid and/or vapours do not escape from a tank space during cleaning by means of cleaning equipment, a housing (2) is provided with magnetic coupling equipment according to the invention, comprising two cooperating pole elements (8,9) which extend hermetically isolated from each other with pole parts extending in the turbine housing (3) on the tank space side and the gear housing (1) itself outside the tank space, respectively. This provides a considerable degree of security against liquid and gas leakage, while making it possible to achieve a compact structure with easy access for service and maintenance.