Pressure relief device and housing comprising same

Patent metadata

Field	Value
Publication number	US-12009641-B2
Application number	US-201917265417-A
Country	US
Kind code	B2
Filing date	Jul 23, 2019
Priority date	Aug 7, 2018
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

A pressure relief device including a gas-permeable body to which a membrane adheres that is preferably impermeable to moisture. The membrane can be a rubber membrane that is formed by applying liquid rubber to the pressure relief body and, optionally, a component which supports the liquid rubber and surrounds the pressure relief body.

First claim

The invention claimed is:

1. A pressure relief device configured for use with explosion-protected housings, the pressure relief device, comprising:
a porous gas-permeable body having a first side facing in a first direction and a second side facing in a second direction, the second direction being away from the first direction; and
a membrane attached to the porous gas-permeable body in a manner being in abutment against the porous gas-permeable body, wherein the membrane comprises a separate first layer comprising a foil that abuts against the porous gas-permeable body and a separate second layer applied to the foil such that the foil is located between the second layer and the porous gas-permeable body.

2. The pressure relief device according to claim 1 , wherein the membrane is attached to the porous gas-permeable body in complete two-dimensional abutment.

3. The pressure relief device according to claim 1 , wherein the second layer is a liquid rubber applied to the foil.

4. The pressure relief device according to claim 1 , wherein the membrane is moisture-impermeable.

5. The pressure relief device according to claim 1 , wherein the membrane is attached to the porous gas-permeable body in a detachable manner by an adhesive.

6. The pressure relief device according to claim 1 , wherein the foil is selected from the group comprising; a piece of paper, a plastic foil, a metal foil, a composite material foil, a plastic/metal composite foil, a woven fabric or another flexible two-dimensional structure.

7. The pressure relief device according to claim 1 , wherein the porous gas-permeable body is a planar pressure relief body.

8. The pressure relief device according to claim 1 , wherein the porous gas-permeable body has a non-planar second side.

9. An explosion-protected housing, comprising:
a housing wall defining an interior;
at least one pressure relief opening in the housing wall in fluid communication with the interior;
a pressure relief device sealing the at least one pressure relief opening, the pressure relief device, comprising:
a porous gas-permeable body having a first side facing the interior in a first direction and a second side facing away from the interior in a second direction; and
a membrane attached to the porous gas-permeable body in a manner being in abutment against the porous gas-permeable body, wherein the membrane comprises a separate first layer comprising a foil that abuts against the porous gas-permeable body and a separate second layer applied to the foil such that the foil is located between the second layer and the porous gas-permeable body.

10. A method for attaching a membrane to a porous gas-permeable body in order to provide a pressure relief device, comprising:
providing a porous gas-permeable body, the porous gas-permeable body having a first side facing in a first direction and a second side facing in a second direction, the second direction being away from the first direction;
applying a foil layer to the second side of the porous gas-permeable body;
spraying of a non-cured membrane material on the foil layer after it has been applied to the second side of the porous gas-permeable body; and
curing the non-cured membrane material.

11. The method according to claim 10 , wherein the non-cured membrane material is also sprayed onto a portion of a housing supporting the porous gas-permeable body.

12. The pressure relief device according to claim 2 , wherein the second layer is a liquid rubber applied to the foil.

13. The pressure relief device according to claim 12 , wherein the membrane is moisture-impermeable.

14. The pressure relief device according to claim 13 , wherein the membrane is attached to the porous gas-permeable body in a detachable manner by an adhesive.

15. The pressure relief device according to claim 14 , wherein the foil is selected from the group comprising; a piece of paper, a plastic foil, a metal foil, a composite material foil, a plastic/metal composite foil, a woven fabric or another flexible two-dimensional structure.

16. The explosion proof housing as in claim 9 , wherein the membrane extends in sections over the housing wall and the housing wall supporting the porous gas-permeable body.

17. The explosion proof housing as in claim 9 , wherein the at least one pressure relief opening is a plurality of openings defined by a grid and the membrane extends over the grid, the porous gas-permeable body being secured to the grid.

18. The explosion proof housing as in claim 9 , wherein the separate second layer has a uniform or non-uniform thickness or different thicknesses.

19. The pressure relief device as in claim 1 , wherein the separate second layer has a uniform or non-uniform thickness or different thicknesses.

Assignees

• Stahl R Schaltgeraete Gmbh

Inventors

• Arnhold Thorsten

Classifications

• H02B1/28 Primary

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

• A62C4/00 Primary

  Flame traps allowing passage of gas but not of flame or explosion wave · CPC title

• F16K17/40

  with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint (valves opening on surplus pressure F16K17/14) · CPC title

• F16K13/06

  constructed to be ruptured by an explosion · CPC title

• Y10T137/1692

  Rupture disc · CPC title