Mechanical seal for boiler feed pump

Abstract

The invention discloses a mechanical seal for a boiler feed pump. The mechanical seal comprises a moving ring assembly and a stationary ring assembly which sleeve a transmission shaft (17) of the feed pump, wherein the moving ring assembly comprises a moving ring (4), a spring seat (13), a spring (7) and a transmission seat (14); one end of the moving ring (4) is propped against the end face of a stationary ring (3), and the other end of the moving ring (4) is connected with the spring seat (13); the two ends of the spring (7) are propped against the spring seat (13) and the transmission seat (14) respectively; the transmission seat (14) is in close fit with a transmission shaft (17); a channel communicated with the inner cavity of a sealing chamber (12) is formed in the circumferential wall of the transmission seat (14); a circumferential limiting device is arranged between the moving ring (4) and the transmission seat (14). Through the adoption of the structure, the heating spring can be timely cooled and flushed, so that the service life of the spring is prolonged, and further, the sealing performance of the mechanical seal is guaranteed.

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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