US 5,077,536 AGranted

Device for protecting electric power resistances and anti-overpressure system

AssigneeLe Metal Deploye

InventorsBernard Fichot, Jean-Pierre Perrichon, Bernard Joubert

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Abstract

A device for the protection of electric power resistances assembled in a battery using rods, insulating guns and isolators all housed within a dust tight and water jet tight parallelepipedic metallic housing, containing only air for cooling the resistances; fixing screws are provided for assembling and holding the various panels together and seals with a cut-out are provided in all assembly areas between the panels so that electrical continuity between two adjacent parts of the panels is achieved through despite any possible loosening; a compression element is interleaved between two adjacent parts of the panels to be assembled, at right angles to passages for the fixing screws, and the compression element is interleaved between the two adjacent parts for producing on opposite faces of the parts a force greater than the rigidity of the parts and housed in the thickness of the cut-out in the seals providing for contact tightness of the parts of the panels without limiting efficiency.

Claims21

Dependent claims

A device for the protection of electric power resistances, particularly grounding resistances assembled in a battery (2), by means f rods, insulating guns and isolators and housed within a dust tight and water jet tight parallelepipedic metallic housing (2), containing only air for cooling said resistances;

said housing comprising:
four side panels (3), a bottom panel (5) and a top panel (4);
fixing screws (9) for assembling and holding said panels together and forming assembly area between said panels;
seals (10) provided in all said assembly area between said panels so that electrical continuity between two adjacent parts of said panels (3, 4, 5) is achieved through said fixing screws (9), despite any possible loosening, and seals having a cut-out (11);
and
a compression element (12) interleaved between said two adjacent parts of said panels (3, 4, 5) to be assembled, at right angles to passages (8) for said fixing screws (9) of the said pairs of said panels (3, 4, 5), said compression elements (12) being interleaved between said two adjacent parts for producing on opposite faces of said parts a force (F) greater than the rigidity of said parts and housed in the thickness of said cut-out (11) in said seals (10) providing for contact tightness of said parts of said panels (3, 4, 5) without limiting the efficiency.

3 more elements

A device for protecting electric power resistances, particularly grounding resistances, assembled in a battery (2), by conventional means of rods, insulating guns and isolators inside a dust tight and water jet tight parallelepipedic metal casing (1) and containing only air to cool said resistances (2);

said casing comprising:
four lateral walls (3), a bottom wall (5) and a top wall (4);
and
an anti-overpressure system including discharge valve means for limiting risks of deformation of said housing (1), whereby to prevent creation of sealing defects and breaking of the isolators;
said housing (1) having an opening (14), and an annular part (16) on said top wall (4) of said housing (1) forming an anti-depressive element brought back in a sealing fashion, around said opening (14);
and
said annular part having on its upper surface a circular groove (18), and a toric seal (19) maintained in said circular groove (18) for forming a seat for the reception of a disk-like valve element (20) acting as a valve, said disk-like valve element (20) having the general shape of a disk, and normally bearing sealingly on said toric seal (19) to form a joint by means formed of its own weight, and of a compressive spring (23) so that said valve element (20) provided with a bearing surface subjected to the inner pressure of housing (1), is pushed back upwardly when the internal pressure exceeds a predetermined safety threshold.

4 more elements

Dependencies are inferred from the claim text.