Improvements of the Seal Rings of 12M-12×4Type Centrifugal Pumps;

Aluminum silicon carbide packaging housing with metal seal ring can be produced successfully by combination of compression molding for SiC preform and vacuum pressure infiltration.

The dynamic characteristic of the seal ring and its effect on rotor vibration are analyzed and computed.

The closed loop dimension and tolerance is calculated in order to calculate and check allowance and allowance tolerance.

It must start from the confirmation of closed loop and retrieval of component loop, draw the line graph of dimension chain correctly and work out relevant procedure dimension and tolerance by using basic formula of dimension chain according to the types of dimension chain of craftwork.

Based on the principal regulation of that dimension obtained indirectly must have accumulated errors, this paper, by means of accumulated errors and generality, mainly discusses the essentiality of dimension chain and analyzes the establishment of closed loop that can embody accumulated errors in technological dimension chain.

The paper expatiate how to differentiate increase ring,decrease ring and sealing ring from the basic conception of the technic dimensional chain in the course of the account of the technic dimensional chain,specially analyses the graphic solution and gives particular solve problems step.

Taking the machining process as the basis in the dimensional chain drawing,with the naturally formation feature of the sealing ring(indirectly protection feature),the sealing ring can be quickly determined.

The technology of the closed circulation and zero discharge in paper mills with waste paper as raw material is a mature one.