A leak-proof sealing device for a liquid pump

Abstract

The invention discloses a leak-proof sealing device for a liquid pump, which is arranged on the pump shaft and the pump cover to prevent the medium conveyed in the pump chamber from leaking to the atmosphere. The device includes three parts: a dynamic sealing assembly, Static seal assembly and dynamic seal auxiliary assembly. The static seal assembly is used for sealing when the pump is stopped, and the dynamic seal assembly and auxiliary dynamic seal assembly are used for sealing when the pump is running, during pump start-up and during pump stop. The dynamic sealing assembly includes threaded shaft sleeve, sealing gland, gland O-ring and gland screw, the auxiliary dynamic sealing assembly includes nitrogen pipeline, solenoid valve, pressure regulating valve and nitrogen gas source, and the static sealing assembly includes slider, fixed block, spring leaf, counterweight, O-ring on the end face of the slider, O-ring on the axial face of the slider and set screws. The core component of the dynamic seal assembly is the threaded shaft sleeve, which pushes the media on both sides to both sides during operation, and the middle part is the isolation belt.

Description

technical field [0001] The invention relates to the field of sealing devices, in particular to a leak-proof sealing device for liquid pumps. Background technique [0002] A liquid pump is a machine used to transport or pressurize a liquid. It transmits the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It is mainly used to transport liquids including water, oil, acid and alkali, Emulsions, suspoemulsions and liquid metals, etc. Various liquid pumps are required for urban water supply, sewage system, power generation system, chemical system, mining metallurgy, shipbuilding, aerospace, etc. [0003] The sealing structure or sealing assembly is an important part of the liquid pump, and it is particularly important when transporting certain liquids, such as toxic and harmful media, high-temperature explosive media, and media that react violently with air. [0004] The seal in the liquid pump is divided into sta...

AI Technical Summary

Problems solved by technology

The mechanical seal is determined by its sealing principle. The machining accuracy of its sealing surface is very high. At the same time, the assembly accuracy and the assembly accuracy of the mechanical seal into the pump are also very high. Therefore, in actual use, the sealing surface is often heated and worn, and the spring is loose. The mechanical seal cannot provide a continuous and stable seal in the event of fracture, cracking and curling of the auxiliary sealing ring, etc.

Images