Mechanical seals for boiler feed pumps

Abstract

The invention discloses a mechanical seal for a boiler feed water pump, comprising a moving ring assembly and a static ring assembly sleeved on a drive shaft (17) of the feed water pump; the moving ring assembly includes a moving ring (4), a spring seat ( 13), spring (7) and transmission seat (14); one end of the moving ring (4) is pressed against the end face of the static ring (3), the other end is connected with the spring seat (13), and the two ends of the spring (7) are respectively It is pressed against the spring seat (13) and the transmission seat (14); the transmission seat (14) is closely matched with the transmission shaft (17), and the circumferential wall of the transmission seat (14) is provided with the inner cavity of the sealing chamber (12). The channel, between the moving ring (4) and the drive seat (14) is provided with a circumferential limit device. After adopting the above structure, the heating spring is cooled and flushed in time, thereby prolonging the service life of the spring and ensuring the sealing performance of the mechanical seal.

Description

technical field [0001] The invention relates to the technical field of seals, in particular to a mechanical seal for boiler feed water pumps. Background technique [0002] In equipment such as pumps and compressors, since the transmission shaft runs through the equipment, there is a circumferential gap between the shaft and the equipment, and the medium in the equipment leaks outward through this gap. If the internal pressure of the equipment is lower than atmospheric pressure, the air will flow to the equipment. Internal leakage, so there must be a shaft seal device to prevent leakage. Mechanical seal is one of the shaft sealing devices, it is also called end face seal, it is composed of at least one pair of end faces perpendicular to the axis of rotation under the action of fluid pressure, elastic force or magnetic force of compensation mechanism and auxiliary seal, to keep fit and relative A device that slides to prevent fluid leakage. The mechanical seal includes a sta...

AI Technical Summary

Problems solved by technology

It can be seen from this that the wave spring is completely sealed in the cavity formed between the transmission seat and the static ring. Therefore, the heat generated when the feed water pump is running at high speed is accumulated in the cavity, causing the spring to heat up until the elastic force fails, resulting in Failure of the entire mechanical seal

[0005] To sum up, the temperature rise of the spring in the mechanical seal of the boiler feed water pump in the prior art cannot be cooled in time, all of which cause the failure of the spring and further lead to the failure of the mechanical seal

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