Leakproof seal device for liquid pump

Abstract

The invention discloses a leakproof seal device for a liquid pump. The leakproof seal device for the liquid pump is arranged on a pump shaft and a pump cover and used for preventing medium conveyed ina pump cavity from leaking to the atmosphere. The leakproof seal device comprises three parts: a power sealing assembly, a static sealing assembly and a power sealing auxiliary assembly. The static sealing assembly is used for carrying out sealing when the pump is in a shutdown state. The power sealing assembly and the power sealing auxiliary assembly are used for carrying out sealing when the pump is in a running state and in the pump starting process and the pump stopping process. The power sealing assembly comprises a thread shaft sleeve, a sealing gland, a gland O-shaped ring and a glandscrew. The power sealing auxiliary assembly comprises a nitrogen pipeline, an electromagnetic valve, a pressure adjusting valve and a nitrogen source. The static sealing assembly comprises a sliding block, a fixed block, a leaf spring, a balancing weight, a sliding block end face O-shaped ring, a sliding block axial face O-shaped ring and a set screw. The core component of the power sealing assembly is the thread shaft sleeve, when the thread shaft sleeve runs, the medium on the two sides is pushed to the two sides, and the middle portion is an isolation zone.

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.

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