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Working cycle process of diaphragm compressor

When the piston of the diaphragm compressor is at the outer stop point, the diaphragm of the diaphragm compressor deforms under the action of the pressure oil and then clings to the surface of the cylinder head. The gas in the gas cavity has been discharged, but there is still high pressure residual gas due to the clearance volume. When the cylinder piston moves toward the inner stop point, the hydraulic pressure in the oil cavity decreases gradually until it disappears. Pressure difference appears on both sides of the diaphragm. The diaphragm begins to shrink and deform under the action of gas residual pressure and self-deforming force. The volume of the gas cavity increases and the air pressure begins to decrease. When the pressure in the cavity is less than the pressure of the suction gas, the suction valve opens automatically. The inhalation process begins. When the piston continues to move toward the inner stop point, the diaphragm continues to deform to the side of the oil cavity under the pressure difference. When the piston moves to the inner stop point, the diaphragm deforms to the lower limit position. The suction valve is closed and the suction process is over. When the piston begins to move outward to the stop point, the hydraulic pressure begins to rise, the diaphragm deforms outward to the stop point, the volume of the air cavity decreases gradually, and the gas in the air cavity is compressed. When the gas pressure in the air cavity is greater than that in the exhaust pipe, the exhaust valve opens, and the compression process completes and discharges the gas until the piston moves to the outer stop point. When the diaphragm is tightly attached to the cylinder head, the exhaust valve closes and the exhaust process ends, so that a working cycle is completed.

In each working cycle of the compressor, the amount of oil in the cylinder will be lost due to leakage of the piston and other parts of the cylinder or slightly more oil discharged from the pressure regulating valve when the pressure is released, which may lead to the occurrence of the oil hydraulic pressure that can not be maintained. Therefore, in each working cycle, it is necessary to supplement the oil to the oil chamber. The eccentric sleeve on the front end of the crankshaft drives the oil pump to replenish the oil to the oil chamber regularly and quantitatively in each working cycle. In each cycle, the excess oil is supplied by the spring pressure reducing valve at the upper part of the oil chamber, and the spring force inside the pressure regulating valve is used to control the amount of oil discharged so as to stabilize the oil pressure.