There was already a patent for scroll technology in the 20th century. However, due to the limitation of the technological level at that time, the scroll could not be produced, and the scroll was forgotten. In 1973, the scroll mechanism was re-lifted and the first model mechanism was manufactured, making the practical application of this technology possible. The scroll mechanism's high reliability, stable operation, extremely low noise, energy saving and other potential and huge advantages immediately aroused the attention and urgent needs of the refrigerator industry, and it was favored by industry leaders and quickly put into industrial applications. The scroll compressor technology and products of famous companies such as Trance, Hitachi, Copland, etc. have led the wave of practical use of scroll technology in the world, and promoted technological progress and product upgrading in many industries such as refrigerators and air conditioners.
Now the scroll technology has been promoted from the initial application in the compressor industry to the vacuum pump manufacturing industry, realizing the practical application of the scroll clean vacuum acquisition technology that is completely oil-free, more stable, lower noise, and more energy-saving. People use scroll concepts and principles to produce single-stage and double-stage oil-free scroll vacuum pumps that have no pollution to vacuum application equipment and the environment, and have better pumping speed, life, energy consumption and other indicators than ordinary oil pumps. People use scroll concepts and principles to produce oil-free scroll vacuum pumps that have no pollution to vacuum application equipment and the environment, and have better pumping speed, working life, energy consumption and other indicators than ordinary oil pumps.
The main advantages of oil-free scroll vacuum pumps include:
1. The sealing is good, there is no leakage channel directly connected to the suction and exhaust chambers like a mechanical pump, it is easy to seal, and it is easy to achieve a higher vacuum degree;
2. The radius of gyration is small, and the relative sliding speed of two scrolls is only about 1/7 of that of the rotary vane vacuum pump. The dynamic seal between two scrolls is relatively easy, which is beneficial to prolong the service life of the pump;
3. The compression process is slow. There are 2 or 3 compression processes at the same time, and the compression chamber is symmetrical to the crankshaft, so that the pump runs smoothly, the driving torque and gas impact fluctuations are small, and the noise and vibration of the pump are reduced.