Introduction to the working principle of air valve assembly

The low-pressure stage suction valve and exhaust valve of the air valve assembly are mounted on the cylinder head and have a lift of 3mm. The high-pressure stage suction valve and exhaust valve are installed in the valve chamber in the middle of the cylinder. The cylinder and the piston are divided into two sections with a large diameter and a small diameter. Above the top of the piston is the low-pressure stage working space of the cylinder, and the air is sucked into the cylinder through the filter.

The annular space in the middle of the piston is the working space of the high pressure stage, and the gas discharged from the low pressure stage is cooled by the interstage cooler and sent to the high pressure stage for further compression. In order to ensure safety, the low-pressure and high-pressure stages are equipped with safety valves, and their safe opening pressures are respectively about 15% and 10% higher than the rated discharge pressure.

The motor drives the crankshaft to rotate through the elastic coupling, and then through the connecting rod, the piston pin drives the piston to reciprocate up and down in the cylinder. When the piston moves from the top dead center to the bottom dead center, the air compressor is in the process of inhalation. At this time, the intake valve spring is compressed and the valve plate moves downward, so the intake valve opens and the air is sucked in. When the piston travels back, that is, when it moves upwards from the bottom dead center, the suction valve begins to close, that is, the valve plate moves upwards to a tight position with the valve seat under the action of its spring elastic force.

When the suction and exhaust valves are both closed, and the piston continues to move upward, the gas is compressed in the cylinder, and when the pressure rises to the discharge pressure, the valve plate of the exhaust valve moves upward to compress the spring to open, and the compression process ends. After the exhaust valve is opened, the pressure in the cylinder will keep the discharge pressure unchanged until the piston travels to the top dead center, all the gas is exhausted, and the exhaust process ends. The maximum position of the valve opening is limited by the lift limiter.