Straight-through type non-contact hermetic sealing structural design for grease lubricating bearing

Abstract

A through-type non-contact hermetic structure used on a grease-lubricated bearing is provided. A horizontal gas path and a vertical gas path communicated with the horizontal gas path are processed on the front cover (4) of a fixed bearing (9). The horizontal gas path is communicated with the gas path of a shell (8) and provided with an inlet gas nozzle (7), and is sealed by an O-shaped seal ring (6). The shell is fixed by a bolt to tighten the bearing (9). A stopper (5) is arranged on the external end of the vertical gas path, and the other end thereof is communicated with the gas path of a gas-separating ring (3). The gas-separating ring is provided with staggered ring grooves, and eight small through-holes which are uniformly distributed inside the grooves in the normal direction of the ring grooves and communicated with the inner and the outer ring grooves. The outer ring grooves are matched with the vertical gas path. The inner ring grooves are matched with a fixed screw (2) with a clearance left therebetween. A screw-connected rotating shaft (1) compresses the bearing. The compressed air enters the horizontal gas path and the vertical gas path through the gas nozzle and gathers inside the gas chamber formed by the outer ring grooves of the gas-separating ring, and then is jetted out of the small through-holes into the gas chamber formed between the fixed screw and the gas-separating ring to be uniformly separated to form a pressure ring-shaped zone to avoid the invasion of impurities.

Description

technical field [0001] The invention belongs to the technical field of bearing seals, and in particular relates to a straight-through non-contact air seal structure design used on grease lubricated bearings. Background technique [0002] At present, the lubrication of electric spindles to the bearings is mostly lubricated with grease. In order to protect the entry of external pollutants, this lubrication method mostly adopts labyrinth gap seals, contact cup seals or air seals at the front end of the bearings. These three sealing methods: [0003] 1. In the labyrinth gap seal structure, due to the existence of the seal gap, for the working environment where there is a large amount of coolant and water vapor or the working end is raised, water and granular impurities formed by processing often enter the inside of the bearing and the main shaft, resulting in Bearing grease fails or even burns the spindle motor installed inside; another problem is that the parts forming the sea...

AI Technical Summary

Problems solved by technology

[0003] 1. In the labyrinth gap seal structure, due to the existence of the seal gap, for the working environment where there is a large amount of coolant and water vapor or the working end is raised, water and granular impurities formed by processing often enter the inside of the bearing and the main shaft, resulting in Bearing grease fails or even burns the spindle motor installed inside; another problem is that the parts forming the sealing structure have strict requirements on dimensional accuracy and shape accuracy, and strict processing requirements, often need to be repaired, which increases management and production costs

[0004] 2. The contact cup seal can form a tight protection to avoid the entry of external pollutants, but the disadvantages are obvious, mainly the linear speed at the contact surface is strictly limited and the working life is low and unstable, which in turn causes the life of the spindle bearing to be short. Sure

[0005] 3. The main problem of the air seal is that the air is discharged from a single point of inclination, the seal is uneven, and there are also hidden dangers in the work

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