Screw air compressor

The screw compressor is a type of rotary displacement compressor in which two rotors with helical gears mesh with each other to compress and discharge gas.

Screw air compressor is divided into single screw and twin screw; according to whether there is lubricating oil in the compression process is divided into oil injection and oil-free screw air compressor, oil-free compressor is divided into dry and water spray. Screw air compressors are generally simple in structure, few wearing parts, low exhaust temperature, and large pressure ratio. They are especially not afraid of liquid and dust compression in the gas. The emergence of oil-injected screw compressors makes power technology and refrigeration Screw compressors (including screw air compressors, screw refrigerators, etc.) have developed rapidly at home and abroad.

Working principle: The screw air compressor uses the mutual meshing of the yin and yang screw rotors to continuously reduce the volume between the teeth and continuously increase the pressure of the gas, thereby continuously generating compressed air. The screw air compressor is also a positive displacement compressor, but due to the working principle of the screw type, it is determined that the air supply of the screw air compressor is stable relative to the piston air compressor.

Main advantages: 1. High reliability: The screw air compressor has fewer parts and fewer wearing parts, so it runs reliably and has a long life. 2, convenient operation and maintenance: operators do not have to go through a long period of professional training, can achieve unattended operation, the operation is relatively simple, according to the need to exhaust gas supply. 3. Good power balance: The screw air compressor has no unbalanced inertial force, the machine can work smoothly and at high speed, and can realize basic operation. It is especially suitable for mobile compressors, with small size, light weight and less floor space. 4. Strong adaptability: The screw air compressor has the characteristics of forced gas transmission, the exhaust volume is almost not affected by the exhaust pressure, the operation is stable, the vibration is small, the exhaust is stable, and it can maintain high efficiency in a wide range. 5. Multiphase mixed transportation: There is actually a gap between the rotor tooth surfaces of the screw air compressor, so it can withstand liquid impact and can press and send liquid-containing gas, dust-containing gas, easy-to-polymerize gas, etc. 6. The unit displacement volume is small, saving the occupied area.

Although the screw compressor has the above advantages, but to maintain the normal operation of the screw compressor unit, safe and reliable, long working life, it is necessary to develop a detailed maintenance plan. It is best to perform fixed operation, regular maintenance, and regular inspection and maintenance to keep the compressor clean, oil-free, and dirt-free. Only a comprehensive grasp of the maintenance of common sense and familiar with the solution to the fault, in order to ensure the smooth operation of the compressor.

Main disadvantages: 1, because of its strong balance, can run at high speed, so the power consumption is relatively high. After long-term operation, the screw gap will become larger, and the cost of regular repair or replacement will be large.

Application scope: screw compressor has the unique advantages of high reliability, convenient maintenance and strong adaptability. With the continuous deepening of its research and the continuous improvement of design technology, the performance of screw compressor will be further improved, and its application field is more and more extensive. In addition to traditional applications, the application of screw compressors in new fields such as fuel and batteries will expand rapidly. At the same time, due to the continuous improvement of the reliability of the screw compressor, it has gradually replaced the reciprocating compressor in a certain range, and occupied part of the centrifugal compressor market.

Development trend: in the petrochemical field, the current domestic centrifugal compressor in high-tech and special products can not fully meet the domestic needs, in the technical level, quality, complete sets and other aspects of foreign countries there are still some gaps. However, with the continuous expansion of China's petrochemical production scale, centrifugal compressors continue to overcome new issues in terms of large-scale, domestic design and manufacture of these large-scale gas compressors have been school mature experience. At the same time, due to the challenge of single screw compressor, part of the twin screw air compressor market is occupied by single screw compressor, but the domestic twin screw process compressor will still be a development direction.

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