Working principle of small solenoid valve, structure and design features of small solenoid valve

Small solenoid valve How it works

Solenoid valveWhen in the closed state, under the action of the spring force and the gravity of the valve core, the sealing surface of the valve core sealing block is in close contact with the annular plane of the valve seat. Since the annular plane of the valve seat is very small, the sealing surface of the valve core forms a small annular sealing zone, which plays a good sealing role. When the coil of the small solenoid valve is energized, the valve core moves upward against the pressure of the spring force and self-weight under the action of the electromagnetic force. At this time, the sealing surface of the valve core is separated from the valve seat, the pipeline is connected, and the medium flows out through the valve core hole;the coil is powered off , the electromagnetic attraction force of the coil disappears, and the valve core moves downward under the action of the spring force, closing the air path.

Small solenoid valve structure

Solenoid valve is general It is composed of electromagnetic coil actuator and valve body. In order to achieve the requirements of lightweight, small size, fast response, low power consumption and high reliability of small solenoid valves, an integrated design of solenoid and valve body is adopted. Small solenoid valves mainly consist of valve body, coil, permanent magnet, valve seat, It consists of cadmium magnetic sleeve, valve core sealing block, armature, spring and other components.

Design features of small solenoid valves

1. The solenoid valve core is the executive part of the solenoid valve, and its performance directly determines the performance of the solenoid valve. performance, so the design of the solenoid valve core is very important. The structural type of the valve core is crucial to its suction power. Solenoid valve’s electromagnetic structure adopts spiral tube type. The air gap of the spiral tube electromagnet is in the middle of the excitation coil, and the suction force and stroke are relatively large. Suitable for use as a control component to control the opening and closing of valves.

2. Magnetic isolation ring design. The effective magnetic flux of the moving iron core determines the attraction force of the electromagnet. In addition to increasing the magnetic induction intensity, improving the suction force of the electromagnet requires minimizing magnetic leakage, so that as many magnetic induction lines as possible pass through the moving iron core, so that the main working magnetic circuit is unobstructed, instead of the resistance of the non-working magnetic circuit tending to infinity. It is best to add a ring of non-magnetic material to the electromagnet core to block the magnetic flux leakage of the non-working magnetic circuit.

3. The electromagnet of the solenoid valve is frameless Winding method. Wrap the enameled wire directly around the electromagnet core to form a core electromagnetic coil, and then thread it with the electromagnetic shell to reduce the size. The electromagnetic coil is positioned via a threaded connection without the need for glue injection. In addition, the coil is in direct contact with the electromagnet core, which is beneficial to the heat dissipation of the electromagnet;at the same time, permanent magnets are added to the core to form a bias magnetic field and improve the response speed.

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