US 11,757,266 B2
Apparatus for closing a ventilation opening in a housing of a switch gear and a switch gear comprising such an apparatus
Tomas Pasalov, Moravany (CZ); Adam Ondricek, Tisnov (CZ); and Pavel Vrbka, Nedvedice (CZ)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Oct. 18, 2021, as Appl. No. 17/503,393.
Claims priority of application No. 20213717 (EP), filed on Dec. 14, 2020.
Prior Publication US 2022/0190565 A1, Jun. 16, 2022
Int. Cl. H02B 1/56 (2006.01); H02B 13/025 (2006.01)
CPC H02B 13/025 (2013.01) [H02B 1/565 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An apparatus for closing a ventilation opening in a housing of a switch gear for a sudden increase in pressure caused by electric arcing,
comprising:
a frame that is adapted to be coupled to the housing of the switch gear adjacent the ventilation opening;
a flap pivotally mounted at the frame, the flap being adapted to be moved from an open position in which the flap overlaps the ventilation opening keeping a gap that allows an airflow through the ventilation opening, into a closed position, in which the flap fully covers the ventilation opening and blocks the air flow; and
spring elastic means that urge the flap into the open position, and a retaining element that is adapted to mechanically lock the flap in the closed position after pivoting the flap from the open position into the closed position,
wherein the retaining element is integrally formed with the frame,
wherein the retaining element comprises a ramp section that, when viewed in a direction of movement of the flap towards the closed position, increasingly extends into a passage of the flap, and an adjoining recessed section following the ramp section, into which an edge portion of the flap extends in the closed position to mechanically lock the flap in the closed position in a form-locking manner, and
wherein the frame forms an insert comprising at least one flap, the spring elastic means and the retaining element associated therewith, which is adapted to be mounted in the ventilation opening formed in the housing or a front door of a switch gear.