FR2476259A1 - SEALING ELEMENT, ESPECIALLY FOR CONNECTIONS SUBJECT TO HIGH TEMPERATURES - Google Patents

Abstract

WATERPROOFING ELEMENT CONSISTING OF A METAL ENCLOSURE AND A FILLING MATERIAL TRIM, ESPECIALLY FOR CONNECTIONS SUBJECT TO HIGH TEMPERATURES, SUCH AS EXHAUST GAS TURBO-BLOWERS, CHARACTERIZED BY THE GASKET MATERIAL FILLING 3 OF THE WATERPROOFING ELEMENT IS MECHANICALLY REINFORCED BY THE METAL ENCLOSURE 2 AND IS TIGHTLY ENCLOSED TO PREVENT IT FROM COMING OUT AND THE ENTRY OF CHEMICAL REACTIVE AGENTS.

Description

Sealing element, in particular for subject connections

at high temperatures.

The invention relates to a sealing element consisting of

formed by a metal casing and a filling of filling material, in particular for connections subjected to high temperatures, such as flanges of exhaust gas turbochargers. In * known sealing elements of this type, for example C-shaped sealing rings,

DIN 7603 standard, the metal casing does not normally surround

not the filling material neither before nor

during use, so that the replacement material

pleating can come into contact both with the agents to be sealed, with the constituent elements and also with the surrounding atmosphere. When using such rings

seal at tight watertight connections

put at high temperatures, you don't get

generally a satisfactory seal because the sta-

thermal bility of the materials used is too low or that the materials oxidize at temperatures of

high service and thereby lose their character-

sealing characteristics.

A purely metallic seal, for example using complete rings, is not possible due to the lack of elastic return, which is provided only by the modulus of elasticity of the material, due to the thermal deformation of the components

which appears.

Elastically shaped metal seals, e.g.

moldings, it is true that they have good characteristics

elastic return ticks at ambient temperatures, but largely lose their return characteristics

elastic, by thermal expansion of the pre-formed part

at high temperatures.

The invention therefore proposes to

make a sealing element of the type mentioned above, so that it withstands temperatures

also with regard to the sta-

chemical bility. This problem is solved according to the invention thanks to the fact that the two edges of the metal casing extending in the longitudinal direction of one sealing element, possibly in combination with other parts, hermetically enclose the lining of material. filling and prevent the

penetration of chemically reactive agents.

Thanks to the configuration of the sealing element, the filling material does not come into contact with either the agents to be sealed, neither with the constituent elements, nor with the surrounding atmosphere. As a result, the filling material, for example a material which oxidizes in a normal atmosphere at high temperatures, such as graphite, is protected from external influences, so that the good elastic return characteristics of graphite exist as well. at room temperature only at very high temperatures. Therefore,

the sealing element according to the invention has been

surprisingly firm in practice in connections

dements subjected to high temperatures, for example to seal flanges of turbo-blowers to

exhaust gas.

The present invention will be better understood from

using the following description of several modes

of. - preferred but nonlimiting embodiments shown in the accompanying drawings in which

fig. 1 is a plan view of a sealing element

suitability for connections subject to high temperatures; and fig. 2 to 7 are cross-sectional views,

along line II-II, of the sealing element annu-

laire, according to different embodiments.

Fig. 1 shows a sealing element an-

ring 1 which is intended for use in connections

co.rdements subjected to high temperatures, by

example of flanges of exhaust gas turbochargers

or also in connections to which severe requirements are imposed from the point of view * of the

chemical consistency at high temperatures.

The sealing element was confirmed in practice during the sealing of flanges of exhaust gas turbochargers and in this case has an internal diameter of approximately 45.3 mm and an external diameter d '' about 51.9 mm. The sealing element may have

a circular shape or a different shape.

The annular sealing element according to FIG. 1

preferably has the cross sections shown

felt in figs. 2 to 7.

According to fig. 2, the hermetic confinement of the ma-

filling material is obtained by the abutment of

two edges 2a, 2b of the metal casing.

According to fig. 3, an additional ring 5 is introduced under the location of the seal 4 between the

edges 2a, 2b of the metal casing.

According to fig. 4, the filling material filling is surrounded by another envelope 6, and the locations of the seals 4,7 between the edges 2a, 2b and 6a, 6b are offset, in particular diametrically opposite. According to fig. 5, the two edges 2a, 2b of the metal casing which protrude are folded and

returned.

According to fig. 6, the material lining

filling 3 is surrounded three times, and places them

the joints 4, 7, 8 of the three envelopes 2, 6, 9 are offset so as to overlap by acting

elastically one over the other.

According to fig. 7, the edges 2a, 2b of the envelope

metal pe overlap over an angular range of 45 maximum. The sealing element according to this figure therefore consists of a metal casing 2 whose longitudinal edges 2a, 2b, extending in the peripheral direction of the sealing element,

overlap contiguously with elastic pre-tension

tick. The metal casing of the sealing element for sealing flanges of exhaust gas turbofans or to be used under conditions

of similar service, preferably has a

thickness of 0.5mm. The total height of the sealing element

annular sheaf is advantageously equal in this case to approximately 3.5 mm. The overlap of the longitudinal edges 2a, 2b of the metal casing 2 advantageously extends over an angular range from 10 to 45, preferably

from 20 to -30.

The sealing element according to the invention has, in its various embodiments, a thickness

of sufficient wall to avoid deterioration

canic both before and during its implementation.

A lining, of filling material 3, which is constituted by an elastic or plastic sealing material, preferably by graphite, asbestos

and / or kaolin, is surrounded in this way by the

metallic velvet 2-sufficiently contiguous so that the filling material is protected from influences

external, for example from oxidation-due to

air intake, and therefore retains perma-

its good elastic return characteristics.

This results in operational safety and a

significant life expectancy of the following sealing element

the invention. The graphite packing looks like-

tagging in a pressed form, for example in the form of a ring which adapts to the cross section

interior of the hollow space surrounded by the envelope -

metallic in the form shown in figs. 2 to 7.

As it goes without saying, and as it results from elsewhere

already from the above, the invention is not limited to

ment to those of its modes of application and embodiments which have been more particularly envisaged; it in

embraces, on the contrary, all variants.

''

Claims (10)

1.- Sealing element consisting of a metal casing and a filling material filling, in particular for connections subjected to high temperatures, such as flanges of exhaust gas turbochargers, characterized in that the lining of filling material (3) for the sealing element (1) is mechanically reinforced by the metallic envelope (2) and is sealed to prevent it from coming out and from entering reactive agents chemically. 2.- sealing element according to claim 1, characterized in that the hermetic closure is obtained by abutting the two edges (2a, 2b) of the metal casing. 3.- sealing element according to the claims 1 and 2, characterized in that an additional ring shutter (5) is introduced under the location of the seal (4) edges (2a, 2b) of the metal casing. 4.- sealing element according to claim 1, characterized in that the filling material filling (3) is surrounded by another envelope (6), and that the locations of the seals (4, 7) of the edges (2a, 2b, 6a, 6b) are offset, in particular are diametral- opposite. 5. A sealing element according to claim 1, characterized in that the two edges (2a, 2b) of the metal casing which protrude are folded and turned over. 6. A sealing element according to claim 1, characterized in that the filling material filling (3) is surrounded three times, and that the locations of the seals (4, 7, 8) of the three envelopes (2, 6, 9) are offset so as to nest in acting elastically on each other. 7. A sealing element according to claim 1, characterized by the fact. that the edges (2a, 2b) of the metallic envelope overlap over a range angular covering 45 at most. 8.- sealing element according to claim 1 and any one of claims 2 d 7, charac- terrified by the fact that the metal casing has a sufficient wall thickness to avoid mechanical deterioration of the sealing element also well before that during its establishment. 9. Sealing element according to the claims 1 and 8 and any one of claims 2 to 7, characterized by the fact that it has an annu- laire, this shape can be circular, or a shape closed different. 10.- sealing element according to the claims 1, 8 and 9 and any one of claims 2 to 7, characterized by the fact that the material lining filling material consists of a sealing material elastic or plastic tee, especially graphite, asbestos and / or kaolin.