Magnetic fluid sealing rotary joint

Abstract

The invention discloses a magnetic fluid sealing rotary joint. The magnetic fluid sealing rotary joint comprises a shaft, a floating ring, pole shoes, a permanent magnet, a shell, a front bearing, a rear bearing and an end cover; one end of each throttling hole is in communication with a gap between the floating ring and the shaft, and the other end of each throttling hole is in communication witha second air channel; the floating ring and the pole shoes form a clearance fit with the shaft; and the gaps between the shaft and the pole shoes are filled with magnetic fluids, and the permanent magnet acts on the magnetic fluids through the pole shoes. According to the magnetic fluid sealing rotary joint, two-stage seal is adopted, the first seal adopts a non-contact floating ring seal, the second seal adopts a magnetic fluid seal, zero leakage seal to the fluid medium can be realized, and contact friction between solids is completely avoided; due to the fact that no solid-phase contact friction exists between the sealing element and the rotating part, the adhesive wear is avoided, and the rotary joint has a quite long service life; and due to the fact that the friction torque betweenthe rotating part and a static part is small, the power consumption of the rotary joint is quite low.

Description

technical field [0001] The invention belongs to the technical field of rotary joints, and in particular relates to a magnetic fluid sealed rotary joint. Background technique [0002] The rotary joint is a key component for conveying oil, water, gas and other media to rotating equipment. It connects the media flowing in the static pipeline to the inside of the moving parts to realize the conversion of media transmission from static to dynamic. Rotary joints are mechanical basic components, and their application fields cover almost every processing and manufacturing industry, including metallurgy, machine tools, power generation, petroleum, rubber, plastics, textiles, printing and dyeing, pharmaceuticals, papermaking, food processing, etc. [0003] At present, most of the rotary joints adopt the contact seal design, which generally has the problems of high frictional resistance, short service life, and easy generation of seal wear particles, which will pollute the operating en...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the rotary joints adopt the contact seal design, which generally has the problems of large frictional resistance, short service life and easy generation of seal wear particles, which will pollute the operating environment of the equipment.

The non-contact rotary joint is a high-end product among various types of rotary joints. It has the characteristics of high pressure and high speed. Its main seal adopts a non-contact gap seal, but it cannot achieve zero leakage. Some products use contact seals such as oil seals. The second seal can achieve zero leakage, but it also brings the problem of friction and wear. The life of the rotary joint is limited by the second contact seal

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