Mechanical seal device for high temperature and high pressure forced hot water circulation pump

Abstract

The invention discloses a mechanical seal device for a high-temperature and high-pressure forced hot water circulating pump. The mechanical seal device comprises a pump shaft and a heat exchanger. The pump shaft is provided with a pump shaft sleeve, the pump shaft sleeve is connected with a pump cover, the pump cover is connected with a primary seal base, and a secondary seal base is arranged at the tail end of the outer side of the primary seal base. A first seal cavity is formed between the primary seal base and the pump shaft sleeve, and a primary seal movable structure with a thread pump and a primary seal static structure with a thread pump are arranged in the first seal cavity. The primary seal base is provided with an internal circulation liquid inlet and an internal circulation liquid outlet, and the internal circulation liquid inlet and the internal circulation liquid outlet are communicated with the heat exchanger. A second seal cavity is formed between the secondary seal base and the pump shaft sleeve, and a secondary seal movable structure and a secondary seal static structure are arranged in the second seal cavity. The primary seal base is provided with a cooling water external circulation liquid inlet and a cooling water external circulation liquid outlet, and cooling water is provided by a power plant clear water pipeline. The technical problems that in the prior art, the using effect is unsatisfactory, the maintenance cost is high, the service life is short, and the price is high are solved.

Description

technical field [0001] The invention relates to the technical field of hot water circulating pumps, in particular to a mechanical seal device for high temperature and high pressure forced hot water circulating pumps. Background technique [0002] In the prior art, high temperature and high pressure forced hot water circulating pumps are widely used in metallurgy, electric power, textile, petroleum, chemical industry, rubber, heating and other system fields, to transport high temperature and high pressure hot water and those whose physical and chemical properties are similar to water liquid medium. High-temperature hot water is easy to produce vaporization, which will cause the liquid film on the end face of the mechanical seal to be destroyed, and make the contact end faces of the dynamic and static rings in a semi-dry friction or dry friction state, which will easily cause wear on the two contact end faces, resulting in seal failure and reduced life. At the same time, due ...

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