Structure And Working Principle Of Diaphragm Compressor

- Jan 02, 2019-

Diaphragm compressors are determined by their structural characteristics. It is widely used in compression to transport various high-purity gases, precious rare gases, toxic and harmful gases and corrosive gases. As an irreplaceable positive displacement compressor, it will advance with the development of science and technology and the people's living standards. Continuous improvement will have a wider range of applications. The main application fields of diaphragm compressors are: nuclear power nuclear energy, food and medicine, petrochemical, electronics industry, materials industry, national defense military and scientific experiments.


Diaphragm compressors are mainly composed of motor, base, crankcase, crankshaft linkage mechanism, cylinder components, oil and gas pipelines, electronic control system and some accessories.

The principle of gas-assisted special oil-free high-pressure nitrogen compressor is that nitrogen is completely isolated from hydraulic oil, and the compression process does not cause any pollution. The oil-lubricated piston-type high-pressure compressor is completely avoided. The nitrogen content of the finished product is high. The filter element is replaced regularly and special compressor oil is added. The cost is extremely high. The structure is simple, the maintenance is convenient, the reliability is high, the pressure output is stable, and the running sound is extremely small.



working principle

A reciprocating compressor that reciprocates in a cylinder by a diaphragm to compress and deliver gas. The diaphragm is clamped along the periphery by two limiting plates and constitutes a cylinder. The diaphragm is mechanically or hydraulically driven to reciprocate in the cylinder to achieve compression and delivery of the gas. Compressors made of rubber or plastic diaphragms and mechanically driven are only suitable for applications where the displacement is several cubic meters per hour and the discharge pressure is around 1.2 MPa. They are generally made in single or two stages.



Compressors with metal diaphragms and hydraulic drives are more common, with displacements up to 100 m3/h and multi-stage compressions with exhaust pressures exceeding 100 MPa, suitable for delivery and pressurization of various gases. It can also be used as a booster compressor after an oil-free lubrication compressor. The thickness of the metal separator is generally from 0.3 to 0.5 mm. The life of the diaphragm depends on the material chosen and its surface roughness. Due to the large mass of the hydraulically driven motion, the average speed of the piston in the hydraulic section can only be 2 m/s, so the rotational speed of the machine is usually in the range of 300 to 500 rpm. The ratio of the cylinder working volume surface area to the cylinder volume of the diaphragm compressor is much larger than that of the reciprocating piston compressor. The compression of the gas is close to the isothermal process, so the pressure ratio of each stage can be as high as 25. The diaphragm compressor has good sealing performance due to the cylinder, and the compressed gas is not polluted, and is suitable for various uses in a small displacement. For example, it is used as a small air supply device, a pneumatic regulator, aeration device for aquarium feeding tanks, and transportation and pressurization of oil-free, toxic, corrosive, valuable or radioactive gas in the chemical