Abstract: An air passage device for installation into a mounting opening in a wall of a housing for components generating waste heat, such as a switching box, has a base housing with a fan support for a fan and a design cover with a fan grid having sheet elements. At least one swivellable sheet element or at least one flexible, tongue-shaped side wall section, separated from the remaining side wall surface of the side walls of the design cover by slits running transversely to the longitudinal direction of the side wall, is formed in the region of the upper side wall of the design cover facing away from the swivel axis for swivelling the design cover. The sheet element and the tongue-shaped side wall section are constructed as a detachable and lockable detent connection, able to be actuated by a finger, between the design cover and the base housing.

Abstract: A filter fan includes a basic housing with a frame, wherein the frame is equipped with a quick fastening device in the form of spring-elastic clips. In order to prevent air and/or moisture from penetrating into a housing, the frame extends continuously and without openings around a circumference. The clips are molded onto the frame.

Abstract: An air passage device, in particular a filter fan or outlet filter for installation in a mounting opening in a wall or in a housing of a switch cabinet, which is essentially formed by a ventilation grating and a main housing, and a filter mat is insertable between the ventilation grating and the main housing, the ventilation grating being situated on the main housing using an articulated connection, the ventilation grating having joint pins to form the articulated connection, which may each be guided in joint pin guide structures introduced into the main housing, the joint pin guide structures each connecting at least one closure position, one folded-out catch position, and one removal position to one another. An air passage device is thus provided which, based on a simple construction, allows high flexibility in regard to the operation of the ventilation grating and the filter mat.

Abstract: A device for monitoring a sound generator includes at least one coupler module, a signal evaluation element, and an output element. The device is coupled by at least one coupler module with the sound generator for purposes of monitoring the latter.

Abstract: The switch cupboard for receiving electrical and electronical components and switching elements which is subject to a rotation and which has at least one cooling device (30) with a cold emitting device part (31) placed in its inner space (23) and with a heat emitting device part (32) which is situated outside the switch cupboard (20) and which is placed for example in the tower head (11) of a wind power station is configured in such a manner that a condensate ring (41) is placed as a shell-shaped collecting trough (40) in the area of the cold side (31a) of the cooling device (30) which is placed in a wall (22) of the switch cupboard (20), cold side which is situated in the inner space (23) of the switch cupboard (20), whereby the inner space (42) is connected with a hose (50) guided out of the inner space (23) of the switch cupboard (20) which is configured as a spiral hose (50a) in the area of the warm side (32a) of the cooling device (30) situated outside the switch cupboard (20), whereby the spirally confi

Abstract: An airflow unit, especially a filter fan or discharge filter with or without a tan for installation in an installation opening in a wall, especially a housing for components that produce waste heat, includes a ventilation grating composed of a frame holding a filter medium, a support member with a frame having a peripheral wall surface which expands outwardly, wherein the support member is provided with airflow openings and with water-diverting wings or rib formations. A shielding grating is inserted in the support member on a side facing away from the ventilation grating. An IP seal is foamed onto the support member for protection against splash water and spray water. All components of the airflow unit are held together by clamp or screw connections. The airflow unit is placed on the outer wall surface of the wall of the housing and is preferably detachably connected with the housing wall.

Abstract: The air conditioning system for cupboards for receiving control and automation systems as well as for the network technique, in particular for switch cupboards with a cooling device, is characterized in that warm air (WL) is sucked from the inside (22) of the switch cupboard (20) by means of a fan (31) and is supplied to one or at least two evaporators (35, 135), preferably placed in the surface plane of the fan (31), whereby cold air (KL) is conducted into the inside (22) of the switch cupboard (20), whereby a condenser (45) is placed below the evaporators (35, 135) in such a way that the evaporators (35, 135) come to rest with a section or with their front areas (35a, 135a) above the condenser (45) so that condensate delivered by the evaporators (35, 135) drops onto the condenser (45) and evaporates or volatilizes, whereby ambient air (UL) is delivered to the condenser (45), whereby the cold air delivery sections to the inside (22) of the switch cupboard (20) are constant in their lengths or changeable in l

Abstract: The invention relates to a novel cooling system (100) in which waste heat to be dissipated is first absorbed by an electron emission layer (15). The heat induces a discharge of electrons (13) from the surface of the electron emission layer, whereby the electrons are drawn off by a suction electrode (10) which is located on a positive potential located opposite the emission layer (15). The thermal energy carried along by the electrons (13) induce a heat transfer from the electron emission layer (15) to the suction electrode (10). The intensity of the electron flow can be controlled by the bias voltage of a grid (12) which is arranged between the electron emission layer (15) and the suction electrode (10). The surface of the electron emission layer (15) is preferably composed of alkaline earth metals such as barium or cesium.