Compression ratio-adjustable rubber moulding sealing structure

Abstract

The invention discloses a compression ratio-adjustable rubber moulding sealing structure. The compression ratio-adjustable rubber moulding sealing structure comprises a moulding sealing ring and a compression ratio adjusting device. The moulding sealing ring comprises a rubber matrix 1, a metal skeleton 2, an auxiliary lip 4 and a sealing lip 5; the auxiliary lip 4 is next to the sealing lip 5 and is positioned on a low-pressure side; and micro-bulge ring belts are arranged on the surface of the auxiliary lip. The compression ratio adjusting device comprises a wedge-shaped sliding block 3, an L-shaped pressing cover 6, an elastic element seat 7, a pushing ring 8, an adjusting nut 9, elastic elements 10 and a screw 11; the elastic elements 10 are positioned between the wedge-shaped block 3 and the elastic element seat 7; the inner conical surface of the wedge-shaped sliding block 3 is closely adhered to the inner conical surface at the opening of the moulding sealing ring; the cross section of the pushing ring 8 is rectangular and is placed in an annular groove 71 of the elastic element seat 7; the end surface of the pushing ring 8 is parallel to the bottom surface of the annular groove 71; the adjusting nut 9 penetrates through the L-shaped pressing cover and the elastic element seat 7 in sequence and is closely adhered to one end surface of the pushing ring 8; and through holes are uniformly formed in the circumferential direction in the outside diameter side of the L-shaped pressing cover 6, and the L-shaped pressing cover 6 is connected with the metal skeleton 3 through the screw 11.

Description

technical field [0001] The invention relates to the technical field of rubber molding extrusion sealing structure design, in particular to a rubber molding sealing structure with adjustable compression rate, which is especially suitable for dynamic sealing devices of various reciprocating or rotating machines. Background technique [0002] Rubber molding extrusion type seals are widely used in petrochemical, aerospace, rail transit and marine mining industries due to the fluidity and wear resistance of rubber materials. For different application industries, the requirements for sealing rings are also different. For example, the petrochemical industry requires sealing rings to have the characteristics of corrosion resistance, particle wear resistance, and reliable sealing. The aerospace field requires sealing rings to meet wear resistance, low Frictional power consumption and zero leakage etc. According to different usage requirements, at present, domestic and foreign seal s...

AI Technical Summary

Problems solved by technology

For a specific rubber-plastic dynamic seal structure, the compression rate design of the seal ring is often different under different working conditions, which requires the manufacturer to redesign the seal forming mold for a specific use requirement, resulting in Increased seal development costs

Moreover, the complexity and redundancy of seal products currently on the market is also a headache for seal selectors.

[0003] In addition, wear failure is the most common failure mode of rubber molded seals, and the failed seals are often discarded directly, resulting in serious waste of materials and environmental pollution

However, most of the failures of the seals can be attributed to the insufficient amount of extrusion deformation of the sealing ring, and there are no measures to adjust the extrusion deformation of the sealing ring during the maintenance process

Therefore, at present, most rubber molding seal rings are difficult to adapt to variable working conditions or harsh environments that cause wear and high friction coefficients, which has brought a lot of trouble and even serious threats to the normal production and safety assurance of the above-mentioned industries.

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