In order to meet the requirements of the experimental apparatus and to reduce the input of the vacuum exhaust equipment, splitflow molecular pump can achieve differential pumping is developed.

It is proved that the best method is to enhance the rotor speed and the study shows that the pump can be designed as a full emission or a partial emission pump with a high speed.

At design point for a partial emission pump the static pressure at wall of volute has been measured, and the performance has also been investigated in detail.

An unsteady numerical analysis of the entire flow field was conducted at the design point for a partial emission pump with the arbitrary sliding mesh technology, and the unsteady flow characteristics in impeller and volute were investigated.

Baseing on the actual need of engineering,the design method and make certain the main parameter method of partial flow pump with big-capacity and high-head from the structural and hydraulic design were researched.

The partial flow pump which is also named tangent pump is a kind of new type centrifugal pump for transporting the liquid of small-capacity and high-head.

As the rapid development of petrochemical industry and the fertilizer and pharmaceutical industries,more and more pumps with little flow are needed and the partial flow pump is a kind of new centrifugal pump with little flow and high head.

Xe pumping speed testing for molecular pump;

Review and prospects for a century of molecular pump;

The traditional molecular pump with popular bearing can not meet the challenge of semiconductor manufacturing because of the vibration, short life, unpure vacuu.