Problems About Solenoid Valve Of Refrigeration Compressor

The electromagnetic components of the solenoid valve are composed of fixed iron core, moving iron core, coil and other components; the valve body is composed of spool, spool, spring base and so on. The solenoid coil is directly mounted on the valve body, and the valve body is enclosed in a sealed tube, forming a simple and compact combination

The four-way solenoid valve is also widely used in our production. Its working principle is as follows: when a current passes through the coil, it generates an excitation effect, the fixed iron core attracts the moving iron core, and the moving iron core drives the spool and compresses the spring, changing Changed the direction of the fluid. When the coil is de-energized, the spool is pushed by the elastic force of the spring, and the iron core is pushed back to make the fluid flow in the original direction.

The failure of the solenoid valve will directly affect the operation of the switching valve and the regulating valve. The common failure is that the solenoid valve does not operate, and the following aspects should be investigated:

(1) The terminal of the solenoid valve is loose or the thread is off, the solenoid valve must not be powered, and the thread can be tightened.

(2) The solenoid valve coil is burnt out. The wiring of the solenoid valve can be removed and measured with a multimeter. If it is open, the solenoid valve coil is burnt out. The reason is that the coil is wet, causing poor insulation and magnetic leakage, causing the current in the coil to be too large and burning, so it is necessary to prevent rain 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 coil to burn out. During emergency treatment, the manual button on the coil can be switched from the "0" position to the "1" position during normal operation to make the valve open.

(3) The solenoid valve is stuck. The clearance between the spool sleeve of the solenoid valve and the spool is very small (less than 0.008mm), and it is generally assembled in one piece. When mechanical impurities are introduced or there is too little lubricant, it is easy to get stuck. The treatment method can use steel wire to poke through the small hole of the head to make it rebound. The fundamental solution is to remove the solenoid valve, take out the valve core and valve core sleeve, and clean them with CCI4, so that the valve core moves flexibly in the valve sleeve. When disassembling, pay attention to the assembly sequence and external wiring position of each part, so that the reassembly and wiring are correct, and check whether the spray hole of the lubricator is blocked and whether the lubricating oil is sufficient.

(4) Air leakage. Air leakage will 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 out, causing blow-by of several cavities.