Clearance seal structure capable of sealing liquid and solid phases

Abstract

The invention relates to a clearance seal structure capable of sealing liquid and solid phases, and particularly relates to a clearance structure which realizes the sealing of liquid and solid mediums aiming at a high-speed grinding main shaft. Cooling liquid and solid particle impurities such as sand grains and the like, generated by grinding, exist at the outer end part of a grinding wheel main shaft during the processing of a high-speed grinding machine tool, and the clearance structure forms a sealing structure which prevents the cooling liquid and the solid particle impurities from entering the main shaft at the outer end part of the main shaft. In the structure, a sealing structure formed by a throttling chamber and a labyrinth clearance is formed based on the energy consumption theory of labyrinth clearance sealing and the force analysis conclusion of cooling liquid in the structure, thus the sealing is realized when the main shaft is still and rotating. The structure is assembled by a shaft sleeve, a bearing end cover with a plurality of circumferential throttling grooves and a bearing base, wherein the shaft sleeve is sheathed on the main shaft, the bearing end cover is arranged on the shaft sleeve, and the bearing base is fixed on a wall surface, thereby forming the throttling chamber and the labyrinth clearance; and the structure can be used for the sealing of the main shaft of a high-speed or super-speed grinding machine tool.

Description

technical field [0001] The invention belongs to the technical field of sealing, and relates to a sealing structure, in particular to a gap sealing structure for liquid-solid two-phase sealing of a high-speed spindle bearing with positive and negative rotation. Background technique [0002] At present, the sealing forms of spindle bearings mainly include mechanical contact seals, non-contact gap seals and combined seals. However, with the development of the machinery industry and the continuous increase of the spindle speed, the traditional mechanical contact seals suffer from serious wear and generate a lot of heat, which affects the sealing effect and the life of the sealing parts. Because the non-contact gap seal has no wear and long working life, its application range is more and more extensive. Among them, the labyrinth gap seal, as a common non-contact sealing form in the industry, is widely used in high-speed rotating machinery. [0003] The labyrinth seal is general...

AI Technical Summary

Problems solved by technology

For such complex working conditions, it is difficult for the general gap sealing structure to achieve sealing under various conditions.

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