Explosion-proof housing having internal pressure reduction

Patent metadata

Field	Value
Publication number	US-11627674-B2
Application number	US-201816617921-A
Country	US
Kind code	B2
Filing date	Mar 22, 2018
Priority date	Jun 1, 2017
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

A housing with an inner lining, made of an open-pore material, preferably covering at least two sides of the housing, for the reduction of internal explosion pressure. In addition, or alternatively, a molded body made of the open-pore material, for example a bonded fibrous material, may be arranged in the housing.

First claim

The invention claimed is:

1. A housing consistent with protection class ex-d, the housing comprising:
a wall arrangement comprising at least a first wall and a second wall that encloses an interior space, wherein each of the first wall and second wall comprises;
a pressure relief body having first and second surfaces respectively proximal and distal to the interior space and the pressure relief body comprises a porous, gas-permeable material sufficient to prevent a flame in the housing from escaping the interior space;
an open-pore material extending from the interior space to the pressure relief body, the open-pore material sufficient to absorb a pressure wave from a source increasing pressure within the interior space; and
wherein at least one of the open-pore materials covers and extends beyond a first surface of one of the pressure relief bodies.

2. The housing according to claim 1 , wherein the open-pore material is arranged so as to be directly abutting against the at least two walls.

3. The housing according to claim 1 , wherein the open-pore material includes first and second faces, said first face is proximal to said interior space and said second face distal to said interior space.

4. The housing according to claim 3 , wherein the second face of the open-pore material is parallel to at least one of the at least two walls.

5. The housing according to claim 1 , wherein the open-pore material is a fiber material.

6. The housing according to claim 1 , wherein the open-pore material is bordered by a grid structure connected to the wall arrangement.

7. The housing according to claim 1 , wherein a region of the at least two walls supports the open-pore material and is configured so as to be closed or comprises only flame-arresting gaps.

8. The housing according to claim 1 , wherein the open-pore body comprises a metal or mineral filament arrangement which is bonded by a binding agent so as to be dimensionally stable.

9. The housing according to claim 8 , wherein the filament arrangement comprises metal wires, metal ropes, metal strips, metal fibers, glass fibers, quartz fibers, rock fibers, ceramic fibers or a mixture thereof.

10. The housing according to claim 8 , wherein the binding agent is a synthetic resin.

11. The housing according to claim 8 , wherein the binding agent is an inorganic binder.

Assignees

• Stahl R Schaltgeraete Gmbh
• R Stahl Schaltgerate Gmbh

Inventors

• Hermanowski Clife
• Arnhold Thorsten
• Limbacher Bernd

Classifications

• H05K5/0217 Primary

  Mechanical details of casings (covers, lids, hoods or members for covering apertures H05K5/03) · CPC title

• H05K5/0213 Primary

  Venting apertures; Constructional details thereof · CPC title

• H01H9/042

  Explosion-proof cases · CPC title

• H02B1/28

  dustproof, splashproof, drip-proof, waterproof or flameproof · CPC title

• H02K5/136

  explosion-proof · CPC title