Polyurethane sealing element and production process thereof

Through the multi-level structural design of double-tube plugging and composite seals, combined with the double wrapping of elastic ring and expansion rubber ring, the problems of small contact area and stress concentration of seals are solved, and the high reliability and long life of the seals are achieved, and the seals are dynamically compensated for sealing performance is achieved.

CN120576293APending Publication Date: 2025-09-02广东欧特派环保材料科技有限公司
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Patent Information

Application Number
CN202510788145.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-12
Publication Date
2025-09-02

AI Technical Summary

Technical Problem

The existing polyurethane seals have small contact area and poor coverage in pipeline connections, which cannot effectively deal with irregular interfaces and stress concentrations of the pipeline, resulting in a degradation of sealing performance and lack of adaptive adjustment capabilities, making it difficult to deal with displacement changes caused by thermal expansion, cooling and mechanical vibration of the pipeline.

Method used

A double-tube plugging structure is adopted, combined with composite seals and extruded components, and a multi-level seal structure is designed. The combination of elastic rings and expansion rubber rings is used to inject viscoelastic fluid in the outer capsule into the inner cavity of the elastic ring through the action of the extruded components, achieving double coverage of the internal expansion outer collar, increasing the contact area and uniformly dispersing stress. At the same time, the elasticity and self-repair characteristics of the composite material system are used to dynamically compensate for the sealing performance.

Benefits of technology

It significantly improves the reliability and service life of the seal, can continuously maintain sealing performance under pipe corrosion, displacement, etc., extends the service life of the seal, and solves the leakage problems caused by aging and stress concentration of traditional seals.

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Abstract

The invention belongs to the technical field of sealing parts, and particularly discloses a polyurethane sealing part and a production process thereof.The polyurethane sealing part comprises a first connecting pipe and a second connecting pipe, and the end, close to the first connecting pipe, of the second connecting pipe is fixedly connected with an inserting ring. The problems that a traditional sealing piece is small in contact area and poor in coating performance are solved, a first connecting pipe and a second connecting pipe are positioned through an inserting ring to form mechanical embedding, a protruding ring of a sealing connecting ring is matched with an annular groove of an elastic ring and an expansion rubber ring to construct a physical sealing barrier, the contact area is increased, and when an extrusion assembly applies pressure, an external supply set injects viscoelastic fluid of an outer bag body into an inner cavity of the elastic ring; the driving elastic ring and the expansion rubber ring are internally expanded and externally hooped to doubly wrap and fill the interface gap, so that the plane-to-three-dimensional contact upgrade is realized, the stress is uniformly dispersed, and the expansion rubber ring can compensate the gap through elastic deformation to improve the sealing performance even if the pipeline is rusted and displaced.
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