High-pressure fluid injection device for fuel pellet injector of fusion device

摘要

PURPOSE:To prevent a leaking of fuel gas resulting from a defect that a stem chip does not contact with a valve seat at the same position, and to improve the reliability in the repeating operations of the stem chip and an armature, in a high-pressure fluid injection device for the fuel pellet incident device of a nuclear fusion device. CONSTITUTION:In a high-pressure fluid injection device having a valve opening/ closing member which consists of a stem chip 1, an armature 3, and a valve seat 2, and a stem chip driver which consists of an exciting coil 5 and a body 4, rotary operation preventive means 10 and 11 to prohibit the rotary operation of the armature 3 and the stem chip 1 to the valve seat 2 during the opening and the closing operations of the armature 3 and the stem chip 1 are provided, or a positioning means 16 to contact the stem chip 1 and the valve seat 2 at a same position constantly is provided. And the contact surfaces of the stem chip 1 and the valve seat 2 are made in a plane form respectively.