The Development History and Market Trends of Twin Screw Air Compressors

Around 1878, the German H. Krigar was the first to propose a screw compressor without internal compression. Later, people gradually understood the working principle of the screw compressor. However, the birth date of a screw compressor similar to today's design should be traced back to 1934 when A. Lysholm, the chief engineer of SRM Factory, filed his first patent. In the 1930s, the world's first single-unit oil-injected rotary screw compressor was put into practical use. The early rotary screw compressors were developed by Svenska Roten Maskiner, now known as SRM. Some patents for the design of oil-injected rotary screw compressor profiles still belong to SRM. By 1946, H.R. Nilsson made corrections to the Lysholm profile and then proposed the symmetrical arc profile. Due to the processing level at that time, the symmetrical arc profile developed rapidly. By the late 1960s, the non-symmetrical SRM profile had evolved. The MARK series products adopted the AIRTEC non-symmetrical profile and patented technology from Atlas Copco, which essentially represented variations of the non-symmetrical profile based on SRM technology and the Lysholm profile. In China, research began in 1965, and during the mid to late 1970s, our own profiles and standards were established. In the 1980s, China introduced specialized machining tools for screw rotors and specialized inspection clearance tools from Britain's Holroyd Company, as well as imported equipment such as tool setters, significantly improving the precision and speed of rotor processing.