A forced double-circuit air cooling system designed for using in a sealed cabinet structure. A first air circuit is formed by an air loop moved around each of local modules (3; 4) of a sealed compartment [2] with using a circulation fan (26) which is installed within a sealed air channel [28]. The first air circuit is formed within an internal air channel (18) of the sealed compartment [2]. Wherein the internal air channel is connected to a number of air heat exchangers [22]. A first pair [22.1] of said number of air heat exchangers is equipped with the circulation fan [26]. Wherein a second air circuit [25] contains straight air channels [23] arranged within the ventilated compartment [24] adjacent to the sealed compartment [2]. Each of said straight air channels [23] comprising a second pair [22.2] of air heat exchangers with a blast fan [27] between them.

An electric fan for producing thrust to propel an aircraft is disclosed. The electric fan comprises a stator, a fan rotor rotatably mounted relative to the stator and an electric motor mounted to the stator and drivingly engaged with the fan rotor to cause rotation of the fan rotor relative to the stator. The fan rotor comprises an annular body defining a flow passage therethrough and a plurality of fan blades disposed in the flow passage and mounted for common rotation with the annular body about a fan rotation axis. The electric motor has a motor rotation axis that differs from the fan rotation axis.

A heat dissipation apparatus and a photovoltaic inverter are related to the field of heat dissipation device technologies, to improve a heat dissipation capability of the heat dissipation apparatus. The heat dissipation apparatus includes at least two stacked fan layers, and each fan layer includes at least one fan. A heat dissipation channel in a radiator has a first inlet, and the first inlet communicates with each air exhaust vent in at least one fan layer by using an air duct component. Compared with a solution in which fans are arranged along a width direction of the radiator, the at least two fan layers are stacked, which may not be limited by a width of the radiator. More fans can be arranged in a hierarchical stacking manner, and more fans can increase an overall amount of exhausted air, thereby improving the heat dissipation capability of the heat dissipation apparatus.

A power conversion system includes a housing (outer housing) and a power converter. The power converter is arranged in an internal space of the housing. An outer peripheral surface of the housing is provided with an air inlet and an air outlet. The air outlet communicates with the air inlet via the internal space of the housing and is located below the air inlet.

Certain embodiments of the present application relate to a variable frequency drive (VFD) cabin for a pump configuration including a mobile trailer on which the VFD cabin is to be mounted. The VFD cabin generally includes a medium-voltage VFD and a ventilation system. In certain embodiments, the ventilation system is configured to generate an overpressure condition within the cabin to discourage the entry of dust and debris into the cabin. In certain embodiments, one or more components of the medium-voltage VFD are coupled to the floor of the cabin via a vibration damping system. In certain embodiments, the VFD cabin may be directly coupled to a chassis of the mobile trailer without an intervening suspension being provided between the VFD cabin and the chassis.

An assembly for a power module includes an electrically isolating base body and first and second electrically conductive structures embedded in the base body. The first and electrically conductive structures are configured to carry different voltages during normal operation of the power module. The first and the second electrically conductive structure each comprise a first region that is not covered by the base body. The first region of the first conductive structure is arranged in a hole of the base body and is retracted with respect to an opening of the hole. The hole is filled with an electrically isolating material that covers the first region of the first conductive structure.

A heat sink for cooling at least one power electronics device in a coil unit includes a base plate having a first portion and a second portion. The second portion is arranged vertically beneath the first portion. A plurality of fins extends from a surface of the base plate. The plurality of fins is located at the second portion of the base plate. A height of the plurality of fins measured perpendicular to the surface varies across a width of the base plate.

A heat sink for cooling at least one power electronics device in a coil unit includes a base plate having a first surface and a plurality of fins extending from the first surface. A height of the plurality of fins measured perpendicular to the first surface varies across a width of the base plate.

A system and method for maintaining a temperature of a power system using a cooling system that includes an impeller and a phase change material. During normal operation of the cooling system, heat that is generated by the operation of an electronic device(s) of the power system can be transferred primarily by conduction through an upper base plate and fins of a heat sink, and dissipated via forced convection that is generated by the impeller. Additionally, the phase change material is positioned outside of a main heat flux path of the heat sink such that, during normal operation of the cooling system, the phase change material does not provide a heat flux obstruction. In the event of an impeller failure, the phase change material provides at least a temporary cooling source for an extended period of time via the relatively large latent heat capacity of the phase change material.

A cooling structure includes: a main body receiving heat from a heat source and releasing the heat through a heat dissipation surface and a plurality of heat dissipation fins; a lid member having an air inlet and a fastened portion fastened to the main body; and a fan mechanism. The lid member is disposed to cover a plurality of heat dissipation fins from a side of respective top ends and thereby form a flow path. The fan mechanism has a fan main body that generates airflow, and a seating that holds the fan main body and attaches the fan main body to the lid member. The seating is subjected to an urging force applied from the main body to the seating, or fastened to the main body by a fastener. The cooling structure has a configuration that can suppress generation of vibration of the lid member forming the flow path.