Flexible sealing packing for pump, and manufacturing method thereof

Abstract

The invention relates to a flexible sealing packing for a pump. The flexible sealing packing comprises the following components: 4-6 wt% of graphite and molybdenum disulfide mixing material, 32-38 wt% of PTFE (Polytetrafluoroethylene) fiber, 15-20 wt% of Kelvar fiber, 28-32 wt% of lubricant, 8-12 wt% of natural rubber and 2-4 wt% of calcium carbonate. In the graphite and molybdenum disulfide mixing material, the mass ratio of the graphite to molybdenum disulfide is 3:2; the lubricant comprises high-temperature silicone oil and vaseline, and the mass ratio of the high-temperature silicone oil and the vaseline is 5:1. The flexible sealing packing for the pump has excellent electric insulativity and chemical resistance, is strong in plasticity, and particularly, has outstanding tensile and abrasion resistance, anti-cracking and rustproof property and high-rebound performance.

Description

technical field [0001] The invention relates to a sealing packing, in particular to a flexible sealing packing for a pump and a manufacturing method thereof. Background technique [0002] Whether the pump is good or bad, in addition to the material and structure of the pump meeting the requirements of the working medium, the choice of sealing structure and form is also crucial. Reasonable selection of sealing structure and form is the key to ensure normal and orderly production, reduce maintenance and repair costs, reduce engineering labor intensity, reduce material waste, and avoid environmental pollution. [0003] At present, according to different working conditions and media, as well as different requirements of users for sealing performance, a variety of sealing schemes have emerged, including packing seals, mechanical seals, and flexible packing seals. Among them, the packing seal achieves the sealing effect by winding. This sealing method is cheap and easy to install...

AI Technical Summary

Problems solved by technology

[0005] The current flexible sealing packings have the following problems: they are not suitable for high temperature and high pressure environments; most of the flexible sealing packings only contain one kind of fiber material, and the fiber strength is not enough to affect its tensile strength; the resilience is poor, which affects the compensation of solid volume loss. The stress relaxation of the sealing shaft causes the sealing performance to decrease due to the out-of-roundness and deflection of the sealing shaft; there is no anti-cracking effect of the filler, and the appropriateness of the filler cannot be guaranteed, which will cause chapping on the surface of the filler or hardening of the seasoning; the anti-rust effect is poor, and the contact part with the filler Most of them are metal surfaces, which will inevitably rust after long-term use

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