A magnetic actuator and a valve comprising such an actuator

• Main Authors: LARSEN JAN LINDBERG, BIRKELUND MICHAEL
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2013
• Subjects: ACTUATING-FLOATS; BASIC ELECTRIC ELEMENTS; BLASTING; COCKS; DEVICES FOR VENTING OR AERATING; ELECTRICITY; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; INDUCTANCES; LIGHTING; MAGNETS; MECHANICAL ENGINEERING; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TAPS; THERMAL INSULATION IN GENERAL; TRANSFORMERS; VALVES; WEAPONS

A magnetic actuator (1) comprising a stationary part (3), a movable part (4) and a coil (10) arranged circumferentially relatively to the movable part (4) in such a manner that the movable part (4) is moved relatively to the stationary part (3) in response to a magnetic field induced when an electrical current runs in the coil (10). The stationary part (3) and the movable part (4) are shaped in such a manner that one is provided with a protruding part (5) and the other is provided with a recess (6) adapted to receive the protruding part (5). Thereby the minimum distance between the stationary part (3) and the movable part (4) are kept relatively low, and it is thereby possible to obtain a large pulling force without increasing manufacturing costs. The actuator (1) further comprises a shading ring (7) providing a magnetic field having a phase which is different from the phase of the field induced by the coil (10). This prevents the movable part (4) from repeatedly hitting the stationary part (3) and makes the