With the rapid development of modern industry, my country's new mechanical seal technology has higher and higher requirements for sealing, and a single seal is sometimes difficult to meet harsh working conditions. Combining several seals to give full play to their respective advantages has become a technology widely used in the sealing industry.

There are many types of combined mechanical seals, but there are no more than non-contact seals and contact seals, or contact seals and contact seals. In the case of high parameters or harsh working conditions, mechanical seals and floating ring seals, spiral seals, or labyrinth seals are used to form combined seals. In the combined seal, the mechanical seal mainly plays the role of preventing leakage, while other types of seals play the role of throttling and blocking.

In medium and low-pressure process gas turbine compressors, it is an important technological development to replace the traditional floating ring seal with the combined seal of mechanical seal and floating ring seal. According to statistics, since the 1970s, more and more large-scale petrochemical plant machinery-floating ring combination seals have been imported from abroad, involving fields such as fertilizer, oil refining, ethylene, and chemical industry. Mechanical-floating ring combination seal, the former can suppress internal leakage, and the latter can withstand high pressure. Such seals are produced by China Sichuan Sealing Research Institute and are widely used in centrifugal compressors. In addition, Chinese pumps also use mechanical-labyrinth-screw combined seals, mechanical-packing combined seals,

Mechanical-dry gas combination seals are mainly used in medium and high-pressure conditions. The first-stage seal is a mechanical seal, the sealing medium is liquid, the second-stage seal is a dry gas seal, and the sealing medium is the tracing medium leaked from the first-stage seal and the externally introduced inert gas. Its characteristic is that the mechanical seal is used as the main seal to seal the process medium, and the dry gas seal is used as the auxiliary seal.

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