The unloading mode of the air compressor usually has two forms: (1) closing the intake chamber; and (2) opening the suction valve. For high-power air compressors, the method of opening the suction valve is often adopted, because it can realize two-stage unloading, so that the use efficiency of the air compressor is higher. However, in practical applications, such a fault is often found: when the first-stage unloading is realized, sometimes the first-stage exhaust safety valve will act, generating a huge sound, and the operating driver thinks that the machine is malfunctioning and stops.
Through many observations and analysis, it is found that the reason for this situation is: when the exhaust pressure of the air compressor reaches the first-stage unloading pressure, the press forks of the primary and secondary suction valves do not act at the same time, opening their respective Intake valve. The specific situation is as follows: when the exhaust pressure of the air compressor reaches the first-stage unloading pressure, the pressurizing action of the secondary suction valve opens the secondary suction valve, and the pressing fork of the primary suction valve is due to the pipeline or the small piston There is no action due to inflexible actions. At this time, the first-stage cylinder of the air compressor discharges the high-pressure gas into the secondary air intake chamber according to the normal condition. The second-stage cylinder cannot normally work to discharge the high-pressure gas due to the opening of the suction valve, so that the first-stage exhaust pressure is increased more than the first-stage exhaust. The operating pressure set by the safety valve and the safety valve act.
Moreover, such a failure does not occur every time the air compressor realizes one-stage unloading, especially when the cause of the failure is that the small piston of the primary exhaust valve is inflexible, which brings certain difficulties to the fault finding. Strengthen the intensity of overhaul, especially the inspection of small pistons. Most of this failure occurs due to the inflexibility of the small piston. The small piston is required to be cleaned frequently to remove the carbon deposits and grease on the top, making the action sensitive and reliable. The unloading device on the two suction and exhaust valves is removed or the operating pressure supplied thereto is closed, so that the two-stage unloading can be normally realized, and the above-mentioned failure phenomenon can be avoided.
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