Solenoid valve coil introduction

About this solenoid valve coil

There are many kinds of solenoid valves, such as gas control, liquid (such as oil, water), most of which are coiled on the valve body, can be separated, the valve core is made of ferromagnetic material, which is generated when the coil is energized. The magnetically actuated spool is actuated by the spool to open or close the valve. The coil can be taken separately. This solenoid valve is used to control the opening or closing of the gas pipeline. The movable iron core in the solenoid valve coil is attracted and moved by the coil when the valve is energized, and drives the spool to move to change the conduction state of the valve.

First, the cause of the solenoid valve coil heating

When the coil of the solenoid valve is in the working state (energized), the core is attracted to form a closed magnetic circuit. That is, when the inductance is at the maximum state, the design time. The heat is normal, but the core can not be smoothly sucked when the core is energized, the inductance of the coil is reduced, the impedance is reduced, and the current is increased accordingly. This causes the coil current to be too large and the life is affected, so the oil, impurities, deformation, etc. hinder the iron core activity. When the power is turned on, the action is slow, and even if it is not normally fully absorbed, the coil is often energized with a state in which the impedance is less than normal, which is a factor that causes the coil to heat up.

Second, the quality of the solenoid valve coil is confirmed

Use a multimeter to measure the resistance of the solenoid valve. The resistance of the coil should be around 1K ohm! If the resistance of the coil is infinite, it means an open circuit. If the coil resistance tends to zero, it means a short circuit, it should be replaced with a new one.

Third, the electromagnetic valve coil magnetic force is related to what

The magnetic force of the solenoid valve coil is related to the wire diameter and the number of turns of the coil and the magnetic conductive area of the magnetic steel, that is, the magnetic flux. The DC electromagnetic coil can be pulled out from the iron core; if the AC is not available, the AC coil is pulled out from the iron core, which will cause the coil current to surge and burn the coil. There is a shorting ring inside the AC coil core to reduce vibration. A short circuit ring is not required inside the DC coil core.

Fourth, solenoid valve coil price

The wholesale price on the market is not fixed. The price of the coils of the solenoid valves used by different manufacturers and different product models will vary. There are more than a dozen cheaper ones, 50-80 yuan in the middle, and 100 in the good ones. More than 100 prices.

Five, the problem of the solenoid valve coil:

Q: Recently, the solid coil of the solenoid valve has broken down. The resistance of the normal coil is about 1~2100 ohms, and there is an open circuit when it is broken. I don't know why the solenoid valve coil is broken. It is reasonable to say that the solid coil should not be broken easily. Some say it is the reason for the power supply (just use 220VAC mains without UPS uninterruptible power supply). The TG2531-10M two-position five-way solenoid valve power supply is DC24V, and the 24V power supply is converted by the uninterruptible power supply 220VAC into the switching power supply. It’s hard to be true that the power supply can be converted to 220VAC by the mains. What is the reason??

A: The main reason I think is as follows: The coil is damp, causing poor insulation and magnetic leakage, causing the current in the coil to be too large and burned, so it is necessary to prevent rainwater from entering the solenoid valve (my unit has recently broken a few, it is this Cause) In addition, the spring is too hard, the reaction force is too large, the number of coil turns is too small, the suction is not enough, the coil can be burnt, and the power supply will not be a problem under normal conditions. If the power supply fails, the bad one is a batch, not one. One.

Q: I bought an air compressor automatic drain valve. Now I have added a contactor. I have an auxiliary switch on the contactor. When I turn on the machine, the automatic drainer discharges water for ten seconds every fifteen minutes. The air compressor power contactor releases the auxiliary switch and connects to another set of power supply to continuously supply power to the solenoid valve of the automatic drainer, so that the air in the air compressor can be completely discharged after the shutdown, the effect is good, now the problem It is the solenoid valve coil has been burned two, indicating that the solenoid valve coil can not be energized for a long time, I would like to ask you any way to solve?

A: A freewheeling diode is connected to the coil of the solenoid valve to reduce the effect of current shock on the coil. Or choose the rated current of the solenoid valve to be larger.