The principle, structure, classification and application scenarios of diaphragm compressors

The main application fields of diaphragm compressors are: nuclear power nuclear energy, food and medicine, petrochemical industry, electronics industry, material industry, national defense and military industry and scientific experiments and other industries.

Structure:

Diaphragm compressor is mainly composed of motor, base, crankcase, crankshaft connecting rod movement mechanism, cylinder parts, oil and gas pipelines, electric control system and some accessories.
The principle of the gas-assisted special oil-free high-pressure nitrogen compressor is that the nitrogen is completely isolated from the hydraulic oil, and the compression process does not produce any pollution, completely avoiding oil-lubricated piston-type high-pressure compressors. The finished nitrogen has high oil content, and the filter element is replaced regularly and special compressor oil is added. The disadvantage of high cost. Simple structure, convenient maintenance, high reliability, stable pressure output, and extremely quiet operation.

Working Principle:

A reciprocating compressor that compresses and delivers gas by reciprocating the diaphragm in the cylinder. The diaphragm is clamped by two limiting plates along the periphery to form a cylinder, and the diaphragm is driven to reciprocate in the cylinder by mechanical or hydraulic pressure, so as to realize the compression and delivery of gas.
Compressors with rubber or plastic diaphragms and mechanical drives are only suitable for occasions with a displacement of several cubic meters per hour and an exhaust pressure of about 1.2 MPa. Generally, they are made into single-stage or two-stage compressors.

Compressors that use metal diaphragms and are driven by hydraulic power are relatively common, and their displacement can reach 100 m3/hour, and the exhaust pressure of multi-stage compression can exceed 100 MPa. It is suitable for the transportation and pressurization of various gases. It can also be used as a booster compressor after an oil-free compressor.
The thickness of the metal diaphragm is generally 0.3 to 0.5 mm.

The life of the diaphragm depends on the material selected and its surface roughness. Due to the large moving mass of the hydraulic drive, the average speed of the piston in the hydraulic part can only be 2 m/s, so the speed of the machine is usually in the range of 300 to 500 rpm.

Due to the good sealing performance of the cylinder, the compressed gas will not be polluted, so the diaphragm compressor is suitable for various purposes when the displacement is small.
Such as small gas supply devices, pneumatic regulators, aeration devices for aquarium breeding pools, and the delivery and pressurization of oil-free, toxic, corrosive, valuable or radioactive gases in the chemical industry.