FR2459417A1 - VACUUM TESTING FOR SHOCK PROTECTION - Google Patents

Abstract

A. VACUUM SHORING FOR GRAPHITE BLAST PROTECTION. B. VACUUM SHORING CHARACTERIZED BY INCLUDING A 5 GRAPHITE DISC CONSISTING OF A PLURALITY OF GRAPHITE RINGS EACH OF WHICH HAVE AT LEAST TWO PARTS WITH A PRISMATIC CROSS SECTION. C. THE INVENTION APPLIES IN PARTICULAR TO THE PROTECTION OF CHEMICAL TREATMENT CONTAINERS.

Description

1. The invention relates to a shoring against vacuum

  for burst protection in graphite.

  - To protect closed spaces, for example

  chemistry apparatus, against a spontaneous increase in pressure

  Within these spaces, it is known to use bursting protections or bursting discs, which, when the permissible pressure for the container or apparatus is exceeded, tear or burst and allow in one

  very short time, a pressure balance. A particular material

  particularly suitable for these burst protections, is

  graphite, which has a remarkable resistance to

  erosion and alternating efforts, resistance which is furthermore

  dependent on the temperature of use in the conventional temperature range for chemistry apparatus. Another advantage of graphite burst protections is their

  breakage with a breaking character which releases suddenly and without

  later the entire section of the tube or fitting. If a vacuum prevails permanently, or at least temporarily in the containers to be protected, the use of special shoring

  vacuum is necessary or advantageous, these shoring

  plucking against the surface of the protection by bursting

  born to the container and preventing its deflection towards the

  container. These vacuum supports are made up of

  graphite members having a plurality of parallel bores.

  These vacuum struts are generally mounted in such a way that they are not destroyed during burst security operation and can be used later. This constructive design saving the material also reduces the free discharge section and reduces on average about 40% the flow factor.

  defined as the ratio of the actual flow to

  port to the flow in a smooth tube, so that the cross section of the burst protection has to be increased

  compared to achievements without shoring against vacuum. The au

  alternative which is the simultaneous destruction of vacuum shoring and burst protection, is not

  satisfactory because of the significant technical expense.

  The object of the invention is therefore to simplify

  proud of the known props against vacuum in such a way that

  tayage against the vacuum can be replaced without excessive expense

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  whenever burst protection works.

  To this end, the invention relates to a shoring against vacuum characterized in that it comprises a graphite disk consisting of a plurality of graphite rings each of which comprises at least two parts and a preformatic cross-section, prism surfaces being inclined with respect to

plan of the disc.

  According to another characteristic of the invention, the

  The rings are so arranged that their surfaces are pre-

  The angle of inclination of the surfaces of the prisms with respect to the plane of the disc generally increases with the distance of these surfaces from the center of the disc, and the surfaces of the extended prisms intersect with the side facing the interior of the disc. burst protection. If the container to be protected is operated with a depression, the individual rings constituting the disc bear against each other, and in the case of an overpressure, these rings are

  pressed against burst protection. When the

  tolerable pressure is reached, the set of rings and disk

  are expelled from their support and release the entire

  of the passage section, so that in a very short time

  short, we obtain the desired cancellation of the pressure. At the

  milking known vacuum bracing, the expense for the manufacture of graphite rings having simple shapes is low, so that the advantage of an evacuation section

  important can be used without excessive expense.

  For the manufacture of graphite rings,

  ground coke particles and classified in size are

  With a pyrolabile binder, this mixture is shaped by pressing, vibrating or other shaping processes, and the form blank is heated to about 12,000 Kelvin to carbonize the binder. The shape blanks as well

  "cooked" are then graphitized by heating at a temperature of

  30000 Xelvin%, preferably in an electric oven

  Resistances and rings are made from the structures

  graphite res thus obtained by sawing, turning, grinding, etc ... According to another method which makes it possible to obtain graphite disks with a particularly weak dispersion of the characteristics considered and which allows a manufacturing 2.-

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  of these disks, flat textile structures made of carbon fibers or graphite, for example carbon fabrics,

  stacked on top of each other, the pile is impregnated, possibly

  pressure, with coal pitch or synthetic resin and then subjected to the heat treatment described above. A composite material is thus obtained which comprises, inserted into a graphite matrix, carbon fibers.

  as reinforcing elements. If necessary, the impregnating

  heat treatment and treatment can be repeated several times

time.

  The invention will be explained in more detail below.

  below with reference to an exemplary embodiment, not limited to

  tif shown in section in the single figure attached.

  Between the flanges 1 and 1 'are clamped the graphite bursting disc 2 and also the annular support 6 also made of graphite of the shoring disc 5 formed of rings. In the bursting disc 2 is inserted a pressure disc 3 movable in the direction of the force exerted, and between the bursting disk 2 or the pressure disk 3 and the shoring disk 5 and the ring of pressure. hold 6 is arranged a film of

graphite 4 impervious to gases.

  In comparative trials, it has been observed that

  shoring discs formed of rings did not influence the pre-

  operation of the bursting disks and not to

  not the moment of bursting. During this burst, the entire section of passage of the bursting disk, was

  in any case released suddenly.

RE SELL I C AT IO N S

  1.- Vacuum shoring for graphite burst protection, vacuum shearing characterized

  in that it comprises a graphite disk consisting of a plurality of

  graphite rings, each of which has at least two parts and a prismatic cross-section, the surfaces

  prisms being inclined relative to the plane of the disc.

  2. Shoring according to claim 1, characterized

  in that the graphite disk consists of rings of graphite

  phite whose surfaces are concurrent.

  3.- Shoring according to any one of the claims

  1 and 2, characterized in that the graphite rings

  carry carbon fibers as reinforcing elements.

4.-