Diaphragm compressor is a reciprocating compressor that compresses and delivers gas by reciprocating the diaphragm in the cylinder.

　　A reciprocating compressor that compresses and delivers gas by reciprocating the diaphragm in a cylinder. The diaphragm is clamped by two restriction plates along the periphery and forms a cylinder. The diaphragm is driven by mechanical or hydraulic means to reciprocate inside the cylinder, thereby achieving compression and transportation of gas. Compressors that use rubber or plastic diaphragms and are mechanically driven are only suitable for situations where the displacement is a few cubic meters per hour and the displacement pressure is around 1.2 megapascals. They are generally made as single-stage or two-stage compressors.

　　Diaphragm compressor is a special structure of volumetric compressor, which has the characteristics of high compression ratio, good sealing, and compressed gas is not contaminated by lubricating oil and other solid impurities. Therefore, it is suitable for compressing high-purity, rare and valuable, flammable and explosive, toxic and harmful, corrosive, and high-pressure gases.

　　Compressors that use metal diaphragms and are driven by hydraulic forces are quite common, with a displacement of up to 100Nm3/h. The discharge pressure of multi-stage compression can exceed 100 megapascals, making them suitable for transporting and pressurizing various gases. They can also be used as booster compressors after oil-free lubrication compressors. The thickness of the metal diaphragm is generally taken as 0.3-0.5 millimeters. The lifespan of the diaphragm depends on the selected material and its surface roughness. Due to the large motion mass of hydraulic drive, the average speed of the piston in the hydraulic part can only be taken as 2 meters per second, so the speed of the machine is usually in the range of 300-500 revolutions per minute. The ratio of the cylinder working volume surface area to the cylinder volume of a diaphragm compressor is much larger than that of a reciprocating piston compressor, and the compression of gas is close to an isothermal process, so the pressure ratio of each stage can be as high as 25. Suitable for various purposes with small displacement. Used as a small gas supply device, pneumatic regulator, ventilation device for aquarium feeding pools, as well as for the transportation and pressurization of oil-free, toxic, corrosive, valuable, or radioactive gases in the chemical industry.