| 摘要 |
PURPOSE:To obtain a valve with a simple structure and having no sliding portion and operating reliably by pinching an elastic pipe between an electromagnetic core and a magnetic body, controlling the polarities of the electromagnetic core, and repulsing or adsorbing the magnetic body to open or close a passage in the elastic pipe. CONSTITUTION:A movable electromagnetic core 52 changing the polarities of both ends in response to the direction of the current fed to a coil 51 is arranged between switching valves 23, 33. Permanent magnets 53, 54 are buried facing the movable electromagnetic core 52 on the outsides of the switching valves 23, 33. When the exciting direction of the coil 51 is changed and the upper end of the movable electromagnetic core 52 is set to an N pole and the lower end is set to an S pole, the movable core 52 is moved upward by the magnetic action with the permanent magnets 53, 54, the valve 23 is pressed and closed, and the valve 33 is opened. When the exciting direction is reversed, the valve 23 is opened, and the valve 33 is closed. Accordingly, a passage switching valve with a simple structure and having no sliding portion and reliable operating can be obtained.
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