Fishbone-shaped winding type gasket

Abstract

The invention discloses a fishbone-shaped winding type gasket in the field of winding type gaskets. The fishbone-shaped winding type gasket comprises a plurality of winding parts which are different in radius and are concentrically arranged, each winding part comprises a plurality of elastic metal belts which are tightly wound into a ring shape in the circumferential direction, the center of each elastic metal belt is bent, the inclined faces of the two sides of each elastic metal belt incline towards the medium pressure direction, and each inclined face is provided with at least one bent part. According to the fishbone-shaped winding type gasket, a sealing interface formed by the plurality of winding parts is more uniform in stress and higher in sealing safety and reliability, the plurality of winding parts can share pressure and better bear higher pressure and impact fluctuation, a steel belt with multiple bending points or bent faces is adopted for winding, stress concentration is not prone to being generated, the secondary compression and springback performance can be provided, and the compression and springback variables are greatly improved.

Description

technical field [0001] The invention relates to a herringbone wound gasket, which belongs to the technical field of wound gaskets. Background technique [0002] Common wound gaskets, the sealing body part is mostly made of thin steel strips with V-shaped cross-section and graphite or other non-metallic filler strips alternately stacked and wound on the same mandrel. While the wound gasket has sealing performance, it also has rebound performance under the action of the steel belt, which can compensate a small amount of relaxation caused by changes in temperature or pressure conditions. Generally, the compression of the V-shaped steel belt structure can only reach that of the gasket. About 25% of the thickness, if the compression is too large, the wound gasket will be crushed and the sealing performance will be lost. Since the compression is relatively small, the rebound rate of the gasket is also relatively low. When the temperature or pressure changes drastically, the relax...

AI Technical Summary

Problems solved by technology

In addition, some improved steel belt forms have been developed, such as: S-shaped, C-shaped, W-shaped and other wound gaskets. Although the sealing resilience performance of the new form is better than that of the V-shaped gasket, the design of the gasket is basically the same as the traditional structure. Similarly, these design structures have good sealing effects for flange sealing surfaces with straight precision or non-high temperature and high pressure environments, but for flange sealing with slight deformation or reduced plane accuracy, or for sealing in high temperature and high pressure environments, often Prone to seal failure

[0003] In the actual production of petroleum, chemical, electric power, metallurgy and other industries, a large number of pipeline and equipment flanges are reused after overhaul, and these reusable flanges, after experiencing bolt fastening, temperature rise and fall, pressure shock, or more Or less, there will be a decrease in plane accuracy. As the application of wound gaskets in actual production becomes more and more extensive, similar flange seals account for more than 80% of all gaskets. Due to safety and The requirements of environmentally friendly production, as well as the actual needs of the diversity and variability of the application conditions, put forward higher requirements for the structural form and comprehensive performance of the wound gasket. At this time, the wound gasket form of the above-mentioned existing design structure can't satisfy

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