What is the cause of the solenoid valve coil burnout?
1. External factors
The stable operation of the solenoid valve is inseparable from the cleanness of the fluid medium. Many users use the solenoid valve on the pure water. After more than five years, it still runs normally. Many media will have some fine particles or media. Calcification, these tiny substances will slowly adhere to the valve core, and gradually become harder. Some users have said that the previous night was still running normally. By the next morning, the solenoid valve could not be opened. When it was removed, it turned out to be a valve. There is a thick layer of calcification deposited on the core. Just like the home thermos.
This situation is very common and is the main cause of the solenoid valve coil burnout, because when the spool is stuck, FS = 0, at this time I = 6i, the current will increase by six times, the ordinary coil is very easy to burn. .
2, internal factors
The clearance between the sliding valve sleeve of the solenoid valve and the valve core is very small (less than 0.008 mm), and it is generally a one-piece assembly. When mechanical impurities are introduced or the lubricating oil is too small, it is easy to get stuck. The treatment method can use a steel wire to break in from the small hole of the head to make it bounce back. The fundamental solution is to remove the solenoid valve, take out the valve plug and the valve core sleeve, and clean it with CCI4, so that the valve core can move flexibly in the valve sleeve. When disassembling, pay attention to the assembly sequence of each component and the external wiring position, so as to reassemble and wire correctly, and check whether the oil mist injection hole is blocked and the lubricating oil is sufficient.
If the solenoid valve coil is burnt out, the wiring of the solenoid valve can be removed and measured with a multimeter. If the circuit is open, the solenoid valve coil is burnt. The reason is that the coil is damp, causing poor insulation and magnetic leakage, causing the current in the coil to be too large and burning, so it is necessary to prevent rainwater from entering the solenoid valve. In addition, the spring is too hard, the reaction force is too large, the number of turns of the coil is too small, and the suction force is insufficient to cause the solenoid valve coil to burn. During emergency handling, the manual button on the solenoid coil can be turned from the “0” position to the “1” position during normal operation, so that the valve opens.