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Daily use, maintenance and upkeep of low-temperature chillers
The solenoid valve used in low-temperature chillers is composed of an electromagnetic coil and a magnetic core, and is a valve body containing one or several holes. When the coil is powered on or off, the operation of the magnetic core will cause the fluid to pass through the valve body or be cut off, in order to change the direction of the fluid. The malfunction of the solenoid valve will directly affect the operation of the chiller switching valve and regulating valve. When the solenoid valve of the low-temperature chiller does not operate, the Oukelong editor should investigate from the following four aspects:
1. If the wiring head of the solenoid valve is loose or the wire head falls off, the solenoid valve cannot be powered, and the wire head can be tightened.
2. Electromagnetic valve stuck: The clearance between the slide valve sleeve and the valve core of the low-temperature chiller solenoid valve is very small, usually assembled as a single piece. When mechanical impurities are introduced or there is too little lubricating oil, it is easy to get stuck. The processing method can be to insert a steel wire through the small hole in the head and make it bounce back. The fundamental solution is to remove the solenoid valve, take out the valve core and core sleeve, and clean them, so that the valve core can move flexibly inside the valve sleeve. When disassembling, attention should be paid to the assembly sequence and external wiring position of each component, in order to reassemble and wire correctly. It is also necessary to check whether the oil mist spray hole is blocked and whether the lubricating oil is sufficient.
3. Leakage: Leakage can cause insufficient air pressure, making it difficult to open and close the forced valve. The reason is that the sealing gasket is damaged or the slide valve is worn, causing several cavities to blow air. When dealing with electromagnetic valve faults in the switching system, an appropriate timing should be chosen to handle them when the solenoid valve is in a power-off state. If the problem cannot be resolved within a switching gap, the switching system can be paused and handled calmly.
4. Solenoid valve coil burnt out: Remove the wiring of the solenoid valve and measure it with a multimeter. If there is an open circuit, the solenoid valve coil is burnt out. The reason is that the coil is damp, causing poor insulation and magnetic leakage, resulting in excessive current inside the coil and burning out. Therefore, 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 coil turns is too small, and the suction force is not enough, which can also cause the solenoid valve coil of the low-temperature chiller to burn out. When dealing with emergencies, the manual button on the coil can be moved from the "0" position during normal operation to the "1" position to open the valve.
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