1. The screw compressor is composed of a pair of parallel and intermeshing female and male screws. It is the most widely used type of rotary compressor. There are two types of single-screw and twin-screw. Generally speaking, the screw compressor refers to the twin-screw compressor. It was first proposed by the German H. Krigar in 1878, and it was not until 1934 that the Royal Institute of Technology A. Lysholm established the technology, and began to apply it in industry, and achieved rapid development.
2. Compression principle of screw compressor and suction process: When the rotor rotates, the volume between the teeth formed by the main and auxiliary rotors gradually expands, and this volume is only connected to the suction port, and the outside air is sucked into the volume between the teeth. When the volume between the teeth increases, the volume between the teeth is disconnected from the suction port, and the suction ends. This is the "intake process".
3. Closing and conveying process: At the end of air inhalation, the peaks of the main and auxiliary rotors are sealed with the casing, and the air in the volume between the teeth is enclosed in the enclosed cavity composed of the main, auxiliary rotors and the casing. That is, the "closed process". The two rotors continue to rotate, the teeth of the main and auxiliary rotors mesh with each other, the meshing surface gradually moves to the exhaust end, and the air in the volume between the teeth is also transported to the exhaust end, that is, the "transport process". Compression and fuel injection process: During the conveying process, as the rotor rotates, the volume between the teeth decreases continuously due to the meshing of the rotor teeth, and the volume of gas in the volume between the teeth also decreases. The gas is compressed and the pressure rises. , This is the "compression process". At the same time of compression, the lubricating oil is sprayed into the tooth groove and mixed with air due to the pressure difference.
4. Exhaust process: When the rotor turns to the volume between the teeth to communicate with the exhaust port of the casing, the compressed gas begins to be discharged. This process continues until the profile line at the end of the tooth is completely meshed, and the volume between the teeth is zero at this time. The gas is completely exhausted, that is, the "exhaust process" is completed.