Mechanical seal device of plant water pump for nuclear power plant

Abstract

The invention discloses a mechanical seal device of a plant water pump for a nuclear power plant. The mechanical seal device comprises a mechanical seal shaft sleeve, a mechanical seal cavity, a mechanical seal gland, an assembling plate, a transmission seat, a rotating ring, a static ring and a plurality of springs. An outer flange ring is arranged at the lower part of the mechanical seal shaft sleeve; a plurality of spring holes are evenly distributed at the upper end face of the outer flange ring; an inner flange ring is arranged at the upper part of an inner cavity surface of the mechanical seal cavity; an inner circle surface of the inner flange ring is a one-step-ladder-shaped surface with a large upper part and a small lower part; the lower part of the inner circle surface of the mechanical seal gland is configured into a ladder-shaped surface; the ladder-shaped surface forms a ring installing slot together with the ladder-shaped surface on the mechanical seal cavity; the mechanical seal gland and the mechanical seal cavity are axially fixed on the pump body by the assembling plate; the static ring is embedded in the ring installing slot; a raised plate is arranged in the middle of the transmission seat; the transmission seat capable of axially moving is installed on the mechanical seal shaft sleeve; the rotating ring is fixed in an inner cavity at the upper part of the raise plate of the transmission seat; and the plurality of springs are arranged in the spring holes of the mechanical seal shaft sleeve, so that the upper end face of the rotating ring can be slidably jointed with the lower end face of the static ring.

Description

technical field [0001] The invention relates to a plant water pump used in nuclear power plants, in particular to a mechanical seal flushing pipeline of the plant water pump used in nuclear power plants. Background technique [0002] The working medium of plant water pumps used in nuclear power plants is sandy seawater. The main function of important plant water pumps in nuclear power plants is to transfer the liquid heat transferred from the equipment cooling water system to seawater, or to pump seawater to cool the equipment cooling water. As the ultimate heat sink of the nuclear island, its importance is self-evident. [0003] The mechanical seal of the original vertical long-axis pump generally adopts packing seal. Although the packing seal is easy to repair and replace, its sealing performance is not as good as that of the mechanical seal, so it cannot meet the requirements of the plant water pump. Contents of the invention [0004] The object of the present inventi...

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Problems solved by technology

[0003] The mechanical seal of the original vertical long-axis pump generally adopts packing seal. Although the packing seal is easy to repair and replace, its sealing performance is not as good as that of the mechanical seal, so it cannot meet the requirements of the plant water pump.

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