Diaphragm compressor maintenance manual（one）---diaphragm compressor introduction
1. Safety precautions
1.1 The equipment operator shall have operation qualification, and the compressor unit shall be operated by fixed personnel.
1.2 Compressed media and oil with pressure are dangerous. During maintenance or repair, ensure that the compressed media in the whole air compressor system is completely released.
1.3 It is forbidden to approach the fan, belt, coupling and other high-speed rotating parts by hand during the operation of compressor to avoid danger.
1.4 When cleaning the parts of the unit, it is strictly prohibited to use flammable, explosive and volatile cleaning agent, and non corrosive safety solvent shall be used.
1.5 Installation, operation, maintenance and repair of compressor shall be carried out by trained professionals.
2. Equipment introduction
2.1 The diaphragm is a positive displacement compressor, which compresses the gas by changing the volume of the air cavity through the deformation of the diaphragm. The utility model has the advantages of large compression ratio, good sealing performance, and the compressed gas is not polluted by lubricating oil and other solid impurities. Therefore, it is suitable for compressing gases with high purity, rare and precious, inflammable and explosive, toxic and harmful, corrosive and high pressure.
2.2 A curved surface is machined on the cylinder head and oil distribution plate of the diaphragm head, and the diaphragm sanwiched between them forms the air cavity and oil cavity respectively. The air cavity is connected with the suction and exhaust valves installed in the valve hole of the cylinder head, while the oil cavity is connected with the oil cavity in the cylinder block through a large number of guide holes on the oil distribution plate, and the bolts fasten the cylinder head, the diaphragm, the oil distribution plate and the cylinder block together.
2.3 The volume change of the membrane cavity is obtained by the deflection of the membrane in the membrane cavity. The oil enters the oil chamber through the guide hole of the oil distribution plate and acts on the diaphragm, causing the diaphragm to deform in the membrane chamber. The volume of the air chamber and the oil chamber is changed periodically, and the reciprocating motion of the cylinder piston is driven by the crank rod mechanism.
3. Working principle
3.1 working cycle process of compressor:
3.1.1 When the compressor is running, when the piston is at the external dead center, the diaphragm will deform under the action of pressure oil and then cling to the cylinder head surface, and the gas in the air chamber has been discharged.3.1.2 when the oil cylinder piston moves toward the internal dead center, the oil pressure in the oil cavity gradually decreases until it disappears, and the pressure difference appears on both sides of the diaphragm. The diaphragm begins to shrink and deform under the effect of the residual pressure of the gas and its own deformation force, and the volume of the air cavity gradually increases.
3.1.3 When the air pressure in the air chamber is less than the pressure of the gas to be sucked, the suction valve opens automatically and the suction process begins.
3.1.4 When the oil cylinder piston moves to the internal stop position and starts to move to the external stop position, after the diaphragm flexes and deforms to the lower limit position, the suction valve closes and the suction ends.
3.1.5 When the piston moves outward to the dead center, the diaphragm also deforms outward to the dead center, the volume of the air chamber becomes smaller gradually, and the air in the air chamber begins to be compressed.
3.1.6 When the compressed gas pressure in the air chamber is greater than the gas pressure in the exhaust pipe, the exhaust valve will automatically open, the compression process is completed and the gas will be discharged until the cylinder piston moves to the outside dead center, the diaphragm is close to the cylinder head surface, the exhaust valve is closed, and the exhaust process is completed, thus a working cycle is completed.
3.2 In each working cycle of the compressor, the oil volume in the oil cavity or oil cylinder will be lost due to the leakage of the oil cylinder piston and other places. Or because of the oil volume discharged during the pressure relief of the pressure regulating valve. It may result in the failure to establish or maintain the required oil pressure. Therefore, the oil volume in the oil cavity or oil cylinder shall be supplemented in each working cycle.
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