The leakage of the gas valve is the cause of the valve failure. The leakage of the valve will reduce the displacement of the compressor and affect the interstage pressure and temperature of the compressor. The cause of the valve leakage can be discussed from the following aspects: (1) The valve cover of the external leakage suction valve of the gas valve and the bolt of the cylinder are not tightened, and the bolt is tightly biased to cause leakage of the suction and exhaust valve. In addition, damage, failure or malfunction of the gasket may also cause leakage of the valve. External leakage is generally avoided during the installation of the valve, and it does not have a large impact on the displacement.
(2) There are two reasons for the internal leakage of the internal leakage valve of the gas valve: on the one hand, the gasket of the gas valve and the cylinder is damaged, fails or does not cause leakage between the air chamber and the cylinder, resulting in the displacement insufficient. On the other hand, the valve of the valve cannot be in place to cause leakage.
According to the inspection records, on the 7th of November, during the inspection of J21/2, it was found that the spring of the first-stage cylinder exhaust valve had a valve, the valve of the valve was not in place, affecting the displacement, and was replaced during the inspection. A new air valve.
Therefore, the reasons for analyzing the valve plate of the gas valve are not in place: 1) metal fragments or other debris are dropped between the valve seat and the valve plate, and the valve is not tightly closed to form a leak; 2) the valve seat is not in contact with the valve plate. 3) Formation of air leakage; 3) Insufficient valve spring is not appropriate, if the elastic force is too strong, the opening is slow when inhaling, if the elastic force is too weak, the closing is not timely when the inhalation is finished; 4) The suction valve spring is broken, and the compression will also be closed. Slightly and untimely phenomenon; 5) The valve seat and the valve plate are worn, the sealing is not strict, and the air leakage is formed; 6) the suction opening height is insufficient, the gas flow rate is increased, the resistance is increased; 7) the spring is stuck or tilted, so that The valve is not closed tightly.
Damage to the valve plate is responsible for the failure of the valve. The valve plate is usually made in the form of a sheet, which is a part that alternately opens and closes the passage of the valve seat. The study found that the valve damage is caused by two kinds of loads that the valve plate mainly bears during the work: one is the uniform load caused by the pressure difference between the two sides of the valve plate, and the uniform load, with the pressure inside the cylinder The cycle changes, and the alternating load of the pulsating cycle causes the bending fatigue of the valve piece to generate the circumferential crack; the other is the impact load generated by the valve plate colliding with the lift limiter and the valve seat, due to the compression The continuous operation of the machine, the impact is repeated repeatedly, causing the bending deformation of the valve plate, directly forming the radial fracture failure from the outer edge, and the impact force is related to the mass and the speed of the valve plate. Of course, the main form of failure of the valve plate during actual use is the radial fracture caused by the impact load. This damage is caused by fatigue damage caused by multiple impacts of small energy.
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