High-speed oil sealing structure

Abstract

The invention discloses a high-speed oil sealing structure, which comprises an annular base and a pressing ring arranged in the base, wherein the outer edge of the base forms a radially extending retaining edge; an auxiliary sealing lip, an elastic washer and a main sealing lip are sequentially arranged on the inner side of the retaining edge on the base from outside to inside; the outer edge of the pressing ring forms a radially extending pressing edge capable of pressing the auxiliary sealing lip, the elastic washer and the main sealing lip; each of the main and auxiliary sealing lips forms a crimped lip opening which extends to the outer side of a confined space and can be matched with a rotating shaft; the confined space is formed between the main and auxiliary sealing lips and the rotating shaft; spiral grooves of which the pitches are gradually reduced during transition to the crimped lip openings are formed in the inner surfaces, in the confined space, of the main and auxiliary sealing lips. According to the high-speed oil sealing structure, by the pitch-variable spiral grooves, the confined space can be kept under normal pressure, the poor influence of a pumping effect on the main and auxiliary sealing lips is avoided, and the service life of a product is prolonged; the high-speed oil sealing structure is simple, accurate in axial positioning and convenient to mount, and has good radiation effects.

Description

technical field [0001] The invention is used in the technical field of seals, and in particular relates to a high-speed oil seal structure. Background technique [0002] Such as figure 1 As shown, the existing high-speed oil seal structure generally includes an outer skeleton, an inner skeleton, a main sealing lip, a secondary sealing lip and an elastic washer. The main and auxiliary sealing lips are made of PTFE filling material, and the material of the elastic gasket is generally ordinary rubber. The outer end face of the solid inner frame prevents the sealing medium from leaking between the components and becomes the ultimate high-speed oil seal product. [0003] All high-speed oil seals with this type of structure have the following problems: a. The inner walls of the main and auxiliary sealing lips have reverse oil return grooves. Due to the pumping effect of the oil return groove of the sealing lip, the gas in the confined space is discharged together with the seali...

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Problems solved by technology

[0003] All high-speed oil seals with this type of structure have the following problems: a. The inner walls of the main and auxiliary sealing lips have reverse oil return grooves. In the closed space formed between the main and auxiliary sealing lips and the rotating shaft, due to Due to the pumping effect of the oil return tank of the sealing lip, the gas in the closed space is discharged together with the sealing medium, and a negative pressure is formed in the closed space, and the main and auxiliary sealing lips are deformed due to the increase in pressure difference, thereby increasing the contact between the main and auxiliary sealing lips and The tight force between the rotating shafts will increase the temperature of the lip, which may even cause the lip to turn inward or tear, resulting in seal failure

b. When the main and auxiliary sealing lips cannot seal normally due to wear or other reasons, the product can only be scrapped

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