Combined PTFE oil seal with vent hole and manufacturing method and mounting method thereof

Abstract

The invention relates to a sealing component technology, in particular to a combined PTFE oil seal with a vent hole and a manufacturing method and a mounting method thereof. An oil seal body comprises an outer framework, an outer elastic sealing body, an inner framework, a main PTFE sealing lip, an auxiliary PTFE sealing lip and an elastic sealing gasket, and the combined PTFE oil seal is characterized in that the vent hole is arranged in a length space, wherein the lower surface is positioned on the auxiliary PTFE sealing lip and exposed on a bottom gap formed by the auxiliary PTFE sealing lip, the elastic sealing gasket and the outer framework, and the upper surface is in close contact with the main PTFE sealing lip. The closed space of the combined PTFE oil seal with the vent hole is communicated with external space, thereby ensuring the free air circulation, keeping the normal pressure, disabling other external impurities, such as dust, sewage and the like from passing, eliminating the adverse effects of pumping effect on the sealing lips, eliminating the undesirable temperature fluctuations, avoiding performance reduction of the oil seal body or sealing failure and ensuring the stable sealing effect and the service life.

Description

technical field [0001] The invention relates to a sealing component technology, in particular to a combined PTFE oil seal with a vent hole and its manufacturing and installation method. Background technique [0002] The current combined PTFE oil seal has gradually been widely used because of its excellent self-lubricating performance, high temperature resistance, and medium resistance properties of PTFE material. The oil seal body of the conventional combined PTFE oil seal is generally composed of an outer skeleton, an outer elastic sealing part, an inner skeleton, a main PTFE sealing lip, a secondary PTFE sealing lip, and an elastic gasket; the outer elastic sealing body is attached to the outer skeleton through high temperature vulcanization ;During installation, the outer elastic sealing body and the seat hole have an interference fit, so that the oil seal body and the seat hole maintain a relatively fixed position, thereby realizing the sealing of the hole; the elastic g...

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Problems solved by technology

[0003] A combined PTFE oil seal with a vent hole and its manufacturing and installation method of the present invention solves the common problem of the commonly used combined PTFE oil seals at present, due to the pumping effect of the lip seal belt, the air inside the closed space is gradually discharged, forming a negative The pressure will form a suction effect on the main PTFE sealing lip and the auxiliary PTFE sealing lip, resulting in the deformation of the main PTFE sealing lip and the auxiliary PTFE sealing lip, so that the main PTFE sealing lip and the auxiliary PTFE sealing lip will The tightening force increases, resulting in increased temperature rise, which will have adverse effects on the sealing body, rotating shaft and sealing medium. In severe cases, it will cause inversion and tearing of the main PTFE sealing lip and auxiliary PTFE sealing lip. The problem of sealing failure; a combined PTFE oil seal with a vent hole of the present invention, its closed space is connected with the external space, so as to ensure the free circulation of air and maintain normal pressure, while other external media, such as dust, sewage This can eliminate the adverse effect of the pumping effect on the sealing lip and eliminate the adverse temperature fluctuations, thereby avoiding the performance degradation of the oil seal or the failure of the seal, ensuring a stable sealing effect and service life

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