| 主权项 |
1. A solenoid valve comprising:
a valve body defining a first port and a second port isolated from the first port; a bobbin mounted to the valve body, the bobbin comprising:
a tube portion;a connection portion formed at one end of the tube portion;a mounting portion extending from the connection portion in a direction away from the tube portion and mounted to the valve body; anda hole axially extending through the tube portion, connection portion and mounting portion; a winding wound on the tube portion of the bobbin; a stator installed in one end of the hole in the bobbin remote from the mounting portion, the stator defining a third port therein; a plunger defining a void therein; first and second plugs mounted at respective axial ends of the plunger; a flux return device fixed to the stator and the bobbin and configured for cooperating with the plunger and the stator to provide a path for magnetic flux generated by the winding; and a spring attached to the plunger and arranged to urge the plunger towards the valve body, wherein the plunger is slidably disposed within the hole in the bobbin and movable between a normal position, where the plunger is adjacent the valve body and the first plug closes the first port and the second port communicates with the third port via a passage, and an energized position where the plunger is adjacent the stator and the second plug closes the third port and the second port communicates with the first port via the hole in the bobbin; wherein, when energized, the winding moves the plunger against the urgings of the spring to the energized position; and wherein the passage between the second port and the third port passes through the void of the plunger. |
