The construction principle and device introduction of mini solenoid valve

The electromagnetic valve is widely used in daily life. This article introduces the structure principle and device of the miniature solenoid valve. We must meet a lot of questions about the miniature solenoid valve in the protection of production. We have also dealt with various kinds of problems. We must also accumulate a lot of problems about the micro solenoid valve defects. The experience of this article has given you a detailed introduction to the repair of minor solenoid valves.
1: direct actuated solenoid valve:
There are two types of normally closed solenoid valves and normally open solenoid valves. When the coil is electrified, when the coil is electrified, the electromagnetic force occurs when the coil is electrified, so that the moving iron core can overcome the tension spring force with the static iron core to open the valve directly, and the medium is in the path. When the coil is broken, the electromagnetic force is not seen, the moving iron core is reset under the effect of the spring force, and the valve is closed directly and the dielectric is not accessible. Simple structure, reliable operation, normal operation under zero differential pressure and micro vacuum. The usual type is just the opposite. For example, the mini electromagnetic valve 0520C (normally open type) and the mini solenoid valve 0520D (normally closed type) are smaller than 2 diameter.
Two, step direct type solenoid valve:
The valve adopts one time opening valve and two opening valve connection, and the main valve and pilot valve step by step to directly open the main valve port of electromagnetic force and pressure difference. When the coil is electrified, the electromagnetic force causes the moving iron core and the static iron core to be absorbed, the guide valve opening is open and the guide valve is located on the main valve port, and the moving iron core is connected with the main valve core. At the moment, the pressure of the upper chamber of the main valve is unloaded through the guide valve mouth, and the main valve core is moved upward under the effect of pressure difference and electromagnetic force, and the main valve medium flow is open. Let's go. When the coil is broken, the electromagnetic force is not seen. At the moment, the core is closed to the valve hole under the effect of self weight and spring force. At the moment, the medium enters the main valve core cavity in the balance hole to increase the pressure of the upper cavity. At the moment, the main valve is closed under the effect of tension reposition and pressure, and the medium is closed.  The structure is reasonable, the action is reliable, and the operation is reliable at zero pressure difference.
Three. Direct pilot solenoid valve:
The series solenoid valve is composed of a pilot valve and a main spool connected with a channel, and the normally closed type is closed when it is not energized. When the coil is electrified, the magnetic force takes place with the moving iron core and the static iron core, the guide valve opening is open, the medium flows to the outlet. At the moment, the pressure on the main valve core is reduced and the pressure of the inlet side is lower than the pressure of the inlet side. When the coil is broken, the magnetic force is not visible, the moving iron core is reset under the effect of the spring force, and the medium is inflow from the balance hole at the moment, the pressure on the main valve core is increased, and the main valve is closed under the effect of the spring force. The principle of ordinary opening is just the opposite.
In the process of using the solenoid valve, there are several points that most apprentices do not pay much attention to. Here are the following items:
Equipment attention:
When the solenoid valve is used in pneumatic system, when it connects with pneumatic components, the raw material belt is usually used. The same is to complete the function of the seal. But your experienced brothers will surely encounter such a phenomenon: clearly new components, but always leak when they try the machine. One of the major factors in this period is the most common factor, that is, there is no accurate way to take the raw material around the ring, and some of the raw material will go to the gas path. This requires a positive and negative order when the raw material belt is surrounded. All of the apprentices are asked to test and experience them.
For large current solenoid valves, relay must be installed at the front end. Especially the solenoid valve in the oil pressure system, because the current is large, if the relay is not installed, the life of the solenoid valve will be very short.
The solenoid valve is very widely used in our production. We must have met many questions about the solenoid valve in the protection of production, and have dealt with all kinds of problems. We must have accumulated a lot of experiences on the treatment of the electromagnetic valve problems, and I have the problems of controlling the electromagnetic valve problems in the protection. Relatively little, now I will comment on this question with us, and hope to learn more experiences from us and improve together. Let's start with the understanding of the solenoid valve. The solenoid valve is made up of electromagnetic coil and magnetic core. It is a valve body with one or several holes. When the coil is energized or powered off, the operation of the magnetic core will cause the fluid to pass through the valve body or be intercepted to achieve the intention of changing the direction of the fluid. The electromagnetic components of solenoid valves consist of fixed iron core, moving iron core, coil and other components, and some of the valve bodies are composed of spool valve, slide valve sleeve and spring base. The electromagnetic coil is directly installed on the valve body, and the valve body is sealed in the sealing tube, forming a concise and compact combination. The commonly used solenoid valves in our production are two bit three way 0520F, two bit four pass, two bit five pass and so on.  Let me first talk about the meaning of the two: about the solenoid valve is charged and power loss, the valve is open and close on the control.
In our oxygen machine system, two three - way solenoid valves are used most, which can be used to connect or block the gas source in production, and then switch to the pneumatic control film head.
It consists of the valve body, the valve cover, the electromagnetic component, the tension spring and the sealing structure, and the seal block at the bottom of the movable iron core is closed by the pressure of the spring. After electrified, the electromagnet is absorbed, and the upper part of the moving core is provided with a sealing block of the spring to seal the exhaust port, and the airflow enters the membrane head from the air inlet and has the control effect. When the power is lost, the electromagnetic force is not seen, and the moving iron core is detached from the fixed iron core under the effect of the tension spring force.