Self-holding electromagnetic valve

Abstract

The invention discloses a self-holding electromagnetic valve, which comprises a valve body, wherein an inlet and an outlet are formed in the valve body, a fixed iron core assembly is assembled at the upper part of the valve body, the fixed iron core assembly consists of a sleeve, a first fixed iron core, a second fixed iron core and a permanent magnet, the center of the sleeve is vertically provided with an open hole, the first fixed iron core is made of non-magnetic-conduction stainless steel materials, the second fixed iron core is made of soft magnetic materials, the permanent magnet is arranged between the first fixed iron core and the second fixed iron core, the second fixed iron core is fixedly arranged at the upper end of the sleeve, the first fixed iron core is fixedly arranged on the second fixed iron core, a movable iron core assembly is arranged in the sleeve of the fixed iron core assembly, the lower end of the movable iron core assembly is matched with a valve opening formed in the valve body, a spring is arranged outside the lower part of the movable iron core assembly in a sleeving way, the upper end of the spring is abutted against the fixed iron core assembly, the lower end of the spring is abutted against the movable iron core assembly, a reel is arranged outside the fixed iron core assembly, and a winding and a coil magnetic conduction frame are arranged on the reel. The self-holding electromagnetic valve has the advantages that the structure is simple, the manufacturing cost is low, and the self-holding state is stable.

Description

technical field [0001] The invention relates to the technical field of electromagnetic valve manufacturing, in particular to a self-holding electromagnetic valve. Background technique [0002] A general solenoid valve consists of an excitation coil, a fixed iron core, a compression spring, a movable iron core, and a valve body. Its working principle is that when the excitation coil is not energized, the sealing head of the fixed iron core will close the valve under the action of the compression spring and the back pressure of the valve inlet medium. When the excitation coil is energized, the electromagnetic force overcomes the reaction force of the compression spring and the back pressure of the inlet medium of the valve, so that the movable iron core moves to the fixed iron core until the two planes are attracted, and the valve is in the open state. It can keep the valve in the open state only when it is powered on, so it has the disadvantages of large power consumption an...

AI Technical Summary

Problems solved by technology

[0004] Another patent number is 201220167984.9, a Chinese patent titled "a self-holding solenoid valve" discloses a self-holding solenoid valve, which uses only one permanent magnet in the coil to realize the self-holding function of the solenoid valve; however, ordinary The permanent magnet will lose part of the magnetic force due to high temperature during the coil injection molding process, resulting in uneven magnetic force and unstable quality, and the cost of using high-temperature permanent magnets will also greatly increase the manufacturing cost

[0005] There are also some solenoid valves that use a double-coil structure to achieve self-holding functions, such as 200920126847.9 and 201120383164.9; the use of a double-coil structure will not only increase the manufacturing cost, but also complicate the processing process

Images