Monostable axial-flow type solenoid valve based on uncoupled permanent magnet bias

The invention relates to a monostable axial-flow type solenoid valve based on uncoupled permanent magnet bias. The monostable axial-flow type solenoid valve comprises a permanent magnet assembly, a valve body assembly and an armature assembly, a coil, a valve seat and an outer magnetizer; the valve body assembly comprises an upper valve body, a magnetism isolating ring and a lower end cover; the armature assembly comprises an armature cover, an armature, a reed and a baffle plate; the coil forms an electromagnetic loop through the upper valve body, a main body part of the armature, the lower end cover, the magnetism isolating ring and the outer magnetizer; the permanent magnet and the armature cover form a permanent magnet loop through an air gap; the electromagnetic loop and the permanent magnet loop respectively form starting force on the armature assembly. A permanent magnet bias loop and a coil electromagnetic loop are independent from each other, so that influence of the permanent magnet on the coil electromagnetic loop is eliminated; the permanent magnet bias loop and the coil electromagnetic loop are linearly superposed, so that the monostable solenoid valve is simple in magnetic path design; and requirements on starting electromagnetic force are reduced by virtue of permanent magnet biasing force.