A metal skeleton tooth-shaped composite pad with special-shaped teeth

Abstract

Disclosed is a toothed metal framework composite gasket having irregular teeth, comprising a metal framework having tooth-shaped protrusions and a non-metallic sealing material (6), wherein multiple circles of irregular teeth curved in the direction of a pressure source are distributed radially and concentrically along upper and lower end faces of the metal framework, which are covered by a filled non-metallic sealing material. Compared with conventional sealing teeth, new moon-shaped or bow-shaped teeth provide two additional resilient points and additional flexibility, preventing stress building up at two break points at a top part and a root part of the teeth, having relatively high anti-yielding and anti-fatigue performance, and increasing the service life of the gasket. Moreover, a pressure-prevention boss (4) is designed between the irregular teeth, preventing crushing and damage of the irregular teeth caused by excessive pre-stressing force, and ensuring security of sealing. The toothed metal framework composite gasket achieves extremely large improvements in elasticity, toughness, and compression resistance, has a relatively high elastic resilience and pressure bearing capacity, and will not be crushed and does not damage a flange.

Description

technical field [0001] The invention relates to a sealing gasket, in particular to a metal skeleton tooth-shaped composite gasket with special-shaped teeth. Background technique [0002] The traditional toothed gasket (the publication number is DE2437567, the name "a kind of sealing gasket") is a metal gasket or a metal-non-metal composite gasket with triangular tines arranged on a metal skeleton. The triangular tines and the metal skeleton are As a whole, a precision lathe is generally used to process several turns of concentric 90-degree angle gear rings on both sides of the metal flat gasket. The contact between it and the flange surface is a sharp-angle contact. Locating rings and composite gaskets with flexible graphite or PTFE sheets on both sides. Traditional toothed gaskets are suitable for high-pressure and high-temperature working conditions, but there are also some disadvantages: (1) The 90-degree angle makes the pressure open, and it is basically impossible to u...

AI Technical Summary

Problems solved by technology

Traditional toothed gaskets are suitable for high-pressure and high-temperature working conditions, but there are also some disadvantages: (1) The 90-degree angle makes the pressure open, and it is basically impossible to use the sealing compensation force generated by fluid pressure; (2) The sharp corners of the teeth are easy to damage the flange surface; (3) The triangular metal teeth have a small rebound force, which has high requirements for the accuracy of the flange and the stability of the equipment working conditions, and is not suitable for working conditions with severe temperature and pressure fluctuations

Although the radial positioning ring and teeth of the outer ring theoretically also have a certain effect of preventing crushing, but for consecutively arranged teeth, it is obvious that a special pressure-stopping mechanism interspersed between consecutive teeth is required; this kind of stopper The height of the pressing mechanism should be clearly distinguished from the height of ordinary teeth and positioning rings. If it is too high, it will affect the elasticity, and if it is too low, it will not have the effect of preventing crushing

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