The china Molecular Pump factory rotates at a high speed under the drive of a motor, and uses a variable frequency power supply to drive the motor in order to obtain a higher speed. In the molecular flow area, the gas molecules collide with the surface of the blade that rotates at high speed, and the momentum is transferred to the gas molecules, so that part of the gas molecules generate directional flow in the direction of movement of the rigid body surface and are discharged out of the pump to achieve the purpose of pumping. . Generally, the phenomenon of carrying gas molecules on the surface of a rigid body moving at a high speed and moving them in a certain direction is called molecular traction. Vacuum pumps made using this phenomenon are called traction china Molecular Pump factory. The advantage of pulling the china Molecular Pump factory is that it has a short start-up time, a high compression ratio in a molecular flow state, and can pump out various gases and vapors, and is especially suitable for pumping out heavier gases. However, due to the low pumping speed of the China Molecular Pump factory, the sealing gap is too small, the working reliability is poor, the mechanical failure is easy, and the manufacturing is difficult, so it is rarely used in practice. Later, the traction china Molecular Pump factory was improved, and the turbine china Molecular Pump factory appeared. Turbine china Molecular Pump factory has multiple sets of alternate moving and fixed vanes, and each vane has many blades inclined at a certain angle. The actual turbine china Molecular Pump factory is composed of multi-stage blade rows in series, that is, the movable blades, fixed blades, and movable blades are alternately arranged in sequence. When the moving blade rotates, it is similar to the role of an electric fan blade, which can draw air from one side to the other. Increasing the speed of china Molecular Pump factory will help increase the pumping speed of china Molecular Pump factory. Due to the limitation of the blade speed, if the gas molecules move at a high speed, it is more difficult to pump a vacuum. The compound china Molecular Pump factory is a series combination of the turbine china Molecular Pump factory and the traction china Molecular Pump factory. It integrates the advantages of the two pumps. It can operate in a wide pressure range of 10^-6-1Pa. Pumping speed and higher compression ratio greatly increase the outlet pressure of the pump.