Pressure relieving device for an explosion proof housing and a method for the production thereof.

摘要

The present invention relates to a pressure relief device (11) for an explosion proof housing (10) as well as a method for its production. The pressure relieving device (11) has a porous body (12) with a gas-permeable porous central region (13) and a the central area (13) that annularly surrounds edge zone (22) on. A circumferential surface (21) of the porous body (12) is in the edge zone (22) arranged. The porosity and / or the pore size is at the peripheral surface (21) or of the edge zone (22) predefined or changed in such a way that by means of the peripheral surface (21) and / or the edge zone (22) the penetration of liquid casting material (g) into the central zone (13) of the porous body (12), is prevented. The edge zone (22) thus forms a barrier (b) for the casting material (g). Because of this barrier (b), the porous body (12) in a casting mold (31) and inserted with casting material (g) in the manufacture of a receiving part (25) are injection molded or cast. There is thus produced simultaneously with the production of the receiving part (25) a form - and / or material connection between the receiving part (25) and the porous body (12). As a result, the pressure relieving device (11) with the porous body (12) directly in a housing wall (32) or a pressure relief connection piece (33) are integrated.