Drive System For A Cleaning Head Disposed In A Tank
AssigneeAlfa Laval Tank Equipment A/S
InventorsHans Erik JØRGENSEN, Leon HJORSLEV
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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.
Claims6
A drive system for rotating a cleaning head in a tank, said drive system comprising:
- a housing (2) through which cleaning liquid is supplied under pressure;
- a propeller (7) mounted in a liquid channel (4) and being driven by the cleaning liquid passing therethrough, a gear being driven by the propeller (7), the gear being separated from the cleaning liquid passing through the housing (2), said gear using the rotation produced by the propeller (7) to rotate the cleaning head located in the tank (1) at a reduced rotation rate;
- a magnetic coupling interposed between the propeller (7) and the gear for transferring rotation therethrough, the magnetic coupling having a first coupling part disposed inside the housing (2) in the liquid channel (4) and a second coupling part disposed outside the housing (2), the first and second coupling parts configured as mutually parallel discs, the magnetic coupling being a hysteresis coupling having a rotating magnetic inductor and a hysteresis part, one of the magnetic inductor or the hysteresis part being in the housing (2) and forming the first coupling part, the other of the magnetic coupling or the hysteresis part mounted outside the housing (2), forming the second coupling part, the second coupling part connected to an input shaft (12) for transferring rotation to the gear, the second coupling part being displaceable in an axial direction (13) relative to the first coupling part for variably changing the distance between the first coupling part and the second coupling part, the change in distance variably changing an amount of torque transferred through the coupling parts and/or a speed of rotation transferred through the coupling parts to the gear.
Dependencies are inferred from the claim text.