| 摘要 |
PURPOSE: To provide a magnetically guided positive-displacement machine applicable to a dry low-displacement vacuum pump free from pollution, and capable of feeding a sucked gas under the atmospheric pressure. CONSTITUTION: A magnetically guided positive-displacement machine includes a piston 1 situated in a casing. The outline of the piston 1 is hypertrochoidal, as is the outline of the hollow inside volume of the casing. The piston has n axes of symmetry, and the casing has n+1 axes of symmetry. The piston rotates inside the casing in orbital motion about the axisΔc of the casing. To obtain the rotation in orbital motion, firstly the piston is freely and rotatably mounted on a crank pin that has its axis offset relative to the axis of a supporting shaft that is coaxial with the axisΔc of the casing, the shaft being rotated, and secondly, the surface of the piston 1 and the surface of the hollow inside volume of the casing are equipped with permanent magnets 12, 13 creating magnetic repulsion forces.
|
