A rotary heat exchanger includes a hub configured to be rotatably driven by a shaft, a fan including a plurality of fan blades integrally coupled to the hub and extending radially outwardly therefrom, and a heat exchanger including a plurality of heat exchanger sections. The heat exchanger includes a plurality of cooling fins for receiving air from the fan. Each of the plurality of heat exchanger sections is located between two of the plurality of fan blades. The hub, the fan, and the heat exchanger are integrally formed as a single body by a three-dimensional printing process.

A hot water pressure washer employs an internal combustion engine with a drive shaft having an exhaust manifold fluidly connected to an exhaust water heat exchanger. The engine is driveably connected to a hydrodynamic heater, and a high-pressure pump for generating a stream of high-pressure fluid. The hot water pressure washer captures 80-90% of the thermal energy generated during combustion processes of the engine for heating water.

A support frame for a ventilation device for cooling a fluid passing through a cooling circuit of a motor vehicle is disclosed. The frame has an opening defining an opening perimeter configured to receive an impeller, and a central support positioned at the center of the opening and shaped to receive a motor actuating said impeller to generate a ventilation flow. The central support is attached, through said opening, to the frame by at least six holding arms, at least three of which are placed in a first plane or cone of revolution, and another three of which are being placed in a second plane or cone of revolution, different from the first. The first holding arms are each separated from any second holding arm at the opening perimeter by a space covering at least a distance corresponding to a chord of said first holding arms.

A cooling fan has a fan shroud with a fan wheel recess surrounded by a shroud ring and a fan wheel rotatably mounted in the fan wheel recess for conveying the air flow along a conveying direction from a shroud upper side to a shroud underside. The fan wheel has a central hub cup with radially orientated blades and an outer ring connecting the blades at the blade tip ends. A circumferential ring gap is formed between the outer ring and the shroud ring. A rib structure in the ring gap reduces swirl in a gap flow orientated against the conveying direction. A shroud ring section of the shroud ring extends axially beyond the outer ring on the shroud underside. The shroud ring section is orientated parallel or at an angle of inclination and radially inwards relative to the conveying direction.

An attachment structure for a vehicle motor is applied for the purpose of attaching a vehicle motor to in-vehicle equipment. The attachment structure for a vehicle motor is provided with an axial gap motor that includes a rotor and a stator facing each other in the axial direction. The motor is attached to the in-vehicle equipment in a mode in which the axial direction is perpendicular to the vertical direction.

A vehicle radiator air intake screen maintenance system comprising a radiator fan, a fan motor; and a processor operable to control the rotational speed and direction of the radiator fan to: periodically implement a drop cycle whereby a radiator cooling air flow generated by the fan rotating in a forward direction is slowed such debris collected on a radiator air intake screen of the vehicle is caused to fall off due to gravitational force; and periodically implement a full reverse cycle where a rotational direction of the fan is reversed and an expulsion air flow is generated whereby debris collected on vehicle radiator and the air intake screen will be blown off, whereafter reverse rotation of the fan is stopped and the fan is returned to the full forward operating speed and direction.

An internal combustion engine includes an engine block including a cylinder, a piston positioned within the cylinder and configured to reciprocate within the cylinder, a crankshaft driven by the piston, a fuel system for supplying an air-fuel mixture to the cylinder, a starter motor configured to initiate rotation of the crankshaft to start the engine, a cover having a vent opening, a blower housing located between the cover and the engine block for directing cooling air toward the engine block, wherein the blower housing comprises a receptacle electrically coupled to the starter motor, a fan configured to draw the cooling air into the blower housing through the vent opening in the cover to cool the engine block, and a rechargeable battery pack removably attached to the receptacle, wherein the rechargeable battery pack is configured to power the starter motor to start the engine.

Power systems and enclosures having a configurable cooling air flow are disclosed. The power system includes an enclosure; an air inlet location, a first air outlet location, a second air outlet location, a fan assembly, and one or more relocatable covers to obstruct the first and second air outlet locations. The air inlet location may be at a first location on an exterior of the enclosure to permit intake of air from the exterior of the enclosure to an interior of the enclosure. The first air outlet location may be at a second location on the exterior of the enclosure to expel air taken in through the air inlet location, while the second air outlet location at a third location on the exterior of the enclosure to expel air taken in through the air inlet location.

A plural-fans driving apparatus is provided to drive a first fan and a second fan, and the first fan and the second fan are three-phase fans. The plural-fans driving apparatus includes a controller, a first three-phase motor driver structure, a second three-phase motor driver structure, and a protection and input interface circuit. The protection and input interface circuit is coupled to the first three-phase motor driver structure and the second three-phase motor driver structure, and protects the first three-phase motor driver structure and the second three-phase motor driver structure. The controller controls the first three-phase motor driver structure to drive the first fan, and controls the second three-phase motor driver structure to drive the second fan.

A system that may include an engine, and a fan configured to vary a measured engine temperature of the engine during operation. A vehicle controller may also be provided having one or more processors that may be configured to determine an ice risk characteristic of the engine, operate the fan to cool the engine based on the ice risk characteristic, and operate the fan to rotate in reverse based on the ice risk characteristic.