| 摘要 |
An axial flow pump/marine propeller (10; 100; 200; 300; 400) has a pump body carrying a stator (20; 120; 220; 320; 420) which defines a cylindrical inner space, a rotor member (40; 140; 260; 360; 460) being rotatably located in the inner space, and electromagnetic means (24, 26, 44; 124, 126, 144) arranged between the stator and the rotor for generating a rotational magnetic field to drive the rotor to rotate. The rotor has a hollow structure with one or more propelling blades (48; 148; 283; 366) for driving the fluid to flow along the central axis of the pump. This arrangement provides a driving force which produces minimum fluid disturbance and drag therefore a high energy efficiency. The rotor is supported in the pump body by a suspension bearing mechanism which provide rotational and thrust bearing in response to the rotor's rotational and/or axial movements to retain the rotor at a balanced position. In the disclosed embodiments, the bearing means can be formed by mechanical (50; 380; 480), magnetic (150; 190; 240; 250) or hydraulic (49; 149; 270; 356) mechanisms, or a combination of any of them, which keep the rotor fully suspended in and coaxially aligned with the pump body during its operation while at the same time reduce the friction and wear of the rotating parts. By using the magnetic and/or hydraulic suspension to support the rotor, it also avoids the problems and costs of having sealing and lubricating arrangements for the rotary parts, therefore reduce both the manufacturing and maintenance costs. Further arrangements (160, 166) are incorporated into the structure to automatically adjust the axial position of the rotor when it is fully suspended by the hydraulic and/or magnetic mechanisms. Compressible spiral blades can be used to cope with frequent changes of electric inputs and/or output loads. Some of the disclosed embodiments provide clog-free structures suitable for a wide range of applications, such as sewerage pump, sludge pump or marine propeller. An arrangement of two anti-spiral driving members (366, 370; 466, 470) are disclosed for high pressure applications. <IMAGE>
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