The diaphragm compressor is determined by its structural characteristics. It is widely used to compress and transport various high-purity gases, precious and rare gases, toxic and harmful gases and corrosive gases. As an irreplaceable positive displacement compressor, it will follow the progress and development of science and technology and the people’s living standards. Continuous improvement will have more extensive applications. The main application areas of diaphragm compressors are: nuclear power, nuclear energy, food and medicine, petrochemicals, electronics industry, materials industry, national defense and military industry, and scientific experiments.
Structure
The diaphragm compressor is mainly composed of a motor, a base, a crankcase, a crankshaft connecting rod movement mechanism, cylinder parts, oil and gas pipelines, an electronic control system and some accessories.
The principle of the gas-assisted oil-free high-pressure nitrogen compressor is that the nitrogen is completely isolated from the hydraulic oil, and there is no pollution during the compression process. It completely avoids the high oil content of the oil-lubricated piston high-pressure compressor. The filter element is regularly replaced and the special compressor oil is added. Disadvantage of extremely high cost. Simple structure, convenient maintenance, high reliability, stable pressure output, and extremely low operating sound.
Working principle
A reciprocating compressor that compresses and delivers gas by reciprocating a diaphragm in a cylinder. The diaphragm is clamped by two restricting plates along the periphery to form a cylinder. The diaphragm is driven by mechanical or hydraulic pressure to reciprocate in the cylinder to realize the compression and delivery of gas. Compressors that use rubber or plastic diaphragms and are mechanically driven are only suitable for occasions with a displacement of several cubic meters per hour and a discharge pressure of about 1.2 MPa. They are generally made as single-stage or two-stage.
Compressors that use metal diaphragms and are driven by hydraulic power are more common. Their displacement can reach 100 cubic meters per hour, and the discharge pressure of multi-stage compression can exceed 100 MPa, which is suitable for conveying and pressurizing 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 selected material and its surface roughness. Due to the large mass of the hydraulic drive, the average speed of the piston in the hydraulic part can only be 2 meters per second, so the machine speed is usually in the range of 300 to 500 rpm. The ratio of the cylinder working volume surface area of the diaphragm compressor to the cylinder volume is much larger than that of the reciprocating piston compressor. The gas compression is close to an isothermal process, so the pressure ratio of each stage can be as high as 25. Diaphragm compressors are suitable for various applications with small displacement due to the good sealing performance of the cylinder and the compressed gas is not polluted. For example, it is used as a small air supply device, pneumatic regulator, aeration device for aquarium breeding ponds, and the transportation and pressurization of oil-free, toxic, corrosive, precious or radioactive gases in the chemical industry.
Advantage
Diaphragm compressor is a special structure positive displacement compressor. It is the highest compression method in the gas compression field. This compression method has no secondary pollution and has very good protection for the compressed gas. It has a large compression ratio, It has the characteristics of good sealing, and the compressed gas is not polluted by lubricating oil and other solid impurities. Therefore, it is suitable for compressing high-purity, rare and precious, flammable, explosive, toxic and harmful, corrosive, and high-pressure gases. This compression method is usually specified in the world to compress high-purity gases, flammable and explosive gases, toxic gases, and oxygen. Wait.
Classification
A. Classified by structure:
Diaphragm compressors have six types: Z, V, D, L, W, and hexagonal type;
B. Classified by diaphragm material:
The diaphragm material of the diaphragm compressor has two kinds of metal diaphragm (including black metal and non-ferrous metal) and non-metal diaphragm;
C. Classified by compressed media:
It can compress rare and precious gases, flammable and explosive gases, high-purity gases, corrosive gases, etc.
D. Classified by sports organization:
Crankshaft connecting rod, crank slider, etc.;
E. Classified by cooling method:
Water cooling, oil cooling, rear air cooling, natural cooling, etc.;
F. Classified by lubrication method:
Pressure lubrication, splash lubrication, external forced lubrication, etc.
