Housing part for a housing with flameproof encapsulation comprising a porous body

Patent metadata

Field	Value
Publication number	US-9908679-B2
Application number	US-201414469201-A
Country	US
Kind code	B2
Filing date	Aug 26, 2014
Priority date	Aug 27, 2013
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A housing part for an explosion-protected housing ( 10 ) with flameproof encapsulation. The housing part comprises a porous body ( 20 ) in a passage ( 15 ) of the housing part. The passage ( 15 ) is closed in a flameproof manner by means of the porous body ( 20 ). The porous body ( 20 ) comprises an inner side ( 21 ) assigned to the interior of the housing ( 10 ) and an outer side ( 22 ) assigned to the surrounding area ( 12 ) comprising the explosive atmosphere. A gas volume flow can pass through the porous body ( 20 ), entering the porous body ( 20 ) on the inner side ( 21 ) and escape on the outer side ( 22 ) or vice versa. To prevent the penetration of water or of other aqueous liquids into the interior of the housing ( 10 ), the porous body ( 20 ) comprises a hydrophobic surface (B) in at least one area ( 31 ).

First claim

The invention claimed is:

1. An explosion-protected housing ( 10 ) with flameproof encapsulation comprising:
a housing part ( 16 ),
said housing part having a passage ( 15 ) into which a flameproof porous body ( 20 ) is inserted for defining a pressure release device to limit an explosion pressure in an interior of the housing ( 10 ),
said porous body ( 20 ) having an inner side ( 21 ) assigned to an interior of said housing ( 10 ) and an outer side ( 22 ) assigned to a surrounding area ( 12 ) of the housing ( 10 ),
said porous body ( 20 ) being made of an alloyed steel which is temperature resistant up to at least 400° C.
said porous body ( 20 ) having hydrophobic coating that forms a hydrophobic surface (B) for preventing the passage of water from the surrounding area and into the interior of said housing, and
said porous body ( 20 ) providing a gas-permeable connection between said inner side ( 21 ) and outer side ( 22 ) for permitting the passage of high pressure gas from the interior of said housing, through porous body ( 20 ) and hydrophobic coating and to the surrounding area ( 12 ) in the event of an explosion within the housing while preventing the passage of sparks and flames.

2. The explosion-protected housing ( 10 ) according to claim 1 in which said hydrophobic surface (B) contains or adjoins the outer side ( 22 ) of the porous body ( 20 ).

3. The explosion-protected housing ( 10 ) according to claim 1 in which said hydrophobic surface (B) contains or adjoins the inner side ( 21 ) of the porous body ( 20 ).

4. The explosion-protected housing ( 10 ) according to claim 1 in which said hydrophobic surface is formed by a hydrophobic coating (B) which contains a fluorocarbon and/or a silane.

5. The explosion-protected housing ( 10 ) according to claim 1 in which said hydrophobic surface is formed by a hydrophobic coating (B) which contains a fat and/or a wax.

6. The explosion-protected housing ( 10 ) according to claim 1 in which said porous body ( 20 ) comprises fibers which have a diameter of at least 70 micrometers and maximally 130 micrometers.

7. The explosion-protected housing ( 10 ) according to claim 6 in which said fibers ( 29 ) of the porous body ( 20 ) have a hydrophobic surface (B).

8. The explosion-protected housing ( 10 ) according to claim 1 in which said porous body ( 20 ) defines pores having a pore size (P) of at least 80 micrometers and maximally 250 micrometers.

9. The explosion-protected housing ( 10 ) according to claim 1 in which said porous body ( 20 ) has a porosity (Φ) of at least 60% and maximally 80%.

10. The explosion-protected housing ( 10 ) according to claim 1 in which said porous body ( 20 ) is made of stainless steel.

11. The explosion-protected housing ( 10 ) according to claim 1 in which said porous body ( 20 ) is disposed in a passage ( 15 ) of a nozzle ( 16 ).

12. The explosion-protected housing ( 10 ) according to claim 11 in which said nozzle ( 16 ) has a splash water protector ( 35 ) at the outer side ( 22 ) of the porous body ( 20 ).

13. The explosion-protected housing ( 10 ) according to claim 1 in which said porous body has a transverse thickness of at least 5 millimeters.

Assignees

• R Stahl Schaltgerate Gmbh
• Stahl R Schaltgeraete Gmbh

Inventors

• Limbacher Bernd
• Mann Ulrich

Classifications

• H02B1/28

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

• A62C3/002

  for warehouses, storage areas or other installations for storing goods · CPC title

• B65D81/022 Primary

  Containers made of shock-absorbing material (B65D81/03 takes precedence; for thermal insulating purposes B65D81/3813) · CPC title

• A62C4/00 Primary

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

• H05K5/0213

  Venting apertures; Constructional details thereof · CPC title