SOLENOID AND SOLENOID VALVE

摘要

A solenoid comprising a solenoid coil (1) having a longitudinal hole (11c) made at the center of a bobbin (11) made of a non-magnetic material and a coil winding (12) wound round the peripheral wall (11d) of the bobbin (11), a yoke (2) comprising a peripheral side plate (21), an upper end plate (22) and a lower end plate (23) all for covering the outer peripheral surface and both end surfaces of the solenoid coil (1), a pole core (16) disposed at one end of the longitudinal hole (11c) and a plunger (15) fitted slidably into the other end of the longitudinal hole (11c). The solenoid further comprises a protrusion member (24) for forming an irregular magnetic field, formed integrally at the center of the yoke (2), and a recess (11f) for fitting the protrusion member (24) from the end surface of the peripheral wall (11d) of the bobbin (11), formed in the peripheral wall (11d). A diaphragm (3) of a solenoid valve for opening and closing a main valve port (63), opened and closed by the movement of the plunger (15) operates at a constant stroke above a predetermined feed water pressure and at a stroke proportional to the water drainage pressure below the predetermined feed water pressure.