| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electronic expansion valve capable of suppressing an armature from being stuck to a suction member by residual magnetization due to residual magnetic flux. <P>SOLUTION: The electronic expansion valve includes: a valve body 31 having a coolant inlet and a coolant outlet; a valve seat 34 having a small-size passage 341 which has a diameter smaller than that of the coolant inlet and is communicated with the coolant outlet; the armature 32 which is substantially columnar, comes into contact with the valve seat 34 by means of a level pressure difference of coolant before and behind the valve seat 34 and an energizing means in the normal mode and, thereby, closes a flow inlet to the small-size passage 341; and a suction part 3112 which sucks the armature 32 when being operated by magnetic force, thereby, moves the armature in the direction separated from the valve seat 34 against the level pressure difference or the like of the coolant and opens the flow inlet 341a, wherein, when the suction part 3112 sucks the armature 32, a ring member 3212 which contacts with the suction part 3112 and forms a gap between the suction part 3112 and the armature 32 is disposed and the energizing means regulates the moving amount in a radial direction of the armature 32. <P>COPYRIGHT: (C)2012,JPO&INPIT |
