| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electronic expansion valve that can stably close an inflowing port even if dust together with a refrigerant flows in from a refrigerant inlet. <P>SOLUTION: An electronic expansion valve 30 includes a valve body 31 provided with the refrigerant inlet and a refrigerant outlet, a valve seat 34 that has a small-diameter flow passage 341 whose diameter is smaller than that of the refrigerant inlet but which connects with the refrigerant outlet, an armature 32 that closes the inflowing port 341a of the small-diameter flow passage 341 by being biased by a circle leaf spring 35 and a refrigerant pressure difference between the front and the back of the valve seat to contact with the valve seat 34 under a normal condition and opens the inflowing port 341a by moving toward the direction separating from the valve seat 34 against the pressing force by the pressure difference and the bias force of the circle leaf spring 35 when magnetic force acts to itself, and an annular wall member 342 which is provided in the valve seat 34 to surround the periphery of the inflowing port 341a and the top end 342a becomes the section contacting with the armature 32. <P>COPYRIGHT: (C)2012,JPO&INPIT |
