Sealing device for pump shaft

Abstract

The invention discloses a sealing device for a pump shaft. The sealing device for the pump shaft comprises a lubrication side sealing system and a material side sealing system, wherein the lubrication side sealing system is installed on a main shaft, and is far away from a pump head, the material side sealing system is installed on the main shaft, and is close to the pump head, a shell body which is arranged surrounding the main shaft is arranged between the lubrication side sealing system and the material side sealing system, a sealing chamber is arranged between the shell body and the main shaft, the sealing surface of the lubrication side sealing system and the sealing surface of the material side sealing system are communicated with the sealing chamber, a secondary impeller which is fixed with the main shaft is installed in the sealing chamber, and an air inlet pipe and an air outlet pipe are further arranged on the shell body, and are communicated with the sealing chamber. The sealing device for the pump shaft improves reliability of sealing, prevents lubricating fluid from polluting conveyed materials, prevents the conveyed materials from polluting the lubricating fluid, can achieve leakage-free conveying, is beneficial to safe conveying of the materials, and ensures safety of use.

Description

technical field [0001] The invention relates to a pump shaft sealing device for a submerged pump, which is suitable for the pump shaft sealing of submerged pumps that need to transport chemical liquid media in various industries such as petroleum, chemical industry, shipbuilding and papermaking. Background technique [0002] The auxiliary impeller seal is a seal that uses the pressure generated by the work of the added moving parts on the leaking liquid to block or push back the leaking liquid to achieve the function of leak prevention. Its sealing ability comes from the work done by the auxiliary impeller driven by the rotation of the machine shaft, so the auxiliary impeller seal is also called dynamic seal. [0003] The auxiliary impeller is generally installed on the back of the centrifugal pump impeller for sealing between the high pressure side of the impeller outlet and the low pressure side of the pump shaft. For example, the patent literature with the publication nu...

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Problems solved by technology

[0007] However, the patent document whose publication number is CN101493097A only solves the processing method with a small amount of leakage, and there are still two situations that may cause leakage

First of all, if the material seal or the lubrication seal fails, resulting in a large amount of leakage, the reliability of the seal will be greatly tested; secondly, if the material seal and the lubrication seal fail at the same time, it may cause mutual penetration of the two materials

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