| 摘要 |
PURPOSE:To prevent the compressing work of a compressor from decreasing by reducing the pole area of a stationary core which is magnetically contacted with a movable core from the non-compressin side to compression side and maintaining the magnetic reluctance large. CONSTITUTION:A movable core 7 is disposed in a stationary core 4 having a coil 3, a hollow piston 8 which is secured to the core is reciprocatingly movable through a resonance spring 11, and compressed by a cylinder head 10. At this time the area of the surfaces 12c of the poles 12a, 12b which are opposed to the core 4 is gradually reduced from the compression side X to non-compression side X1 on the tapered end faces of the poles 12a, 12b. Accordingly, as the core 1 is progressively attracted, the area of the core 4 which is magnetically contacted does not largely increases, and the magnetic reluctance does not decreased, and the compression force which correlates to it does not alter, thereby preventing the compressing work from decreasing. |
