Provided area second-order sliding mode observation-based fan power control method and system. The method includes: calculating, by second-order sliding mode observation, an observed rotational speed value of a fan, and calculating a maximum power reference current corresponding to maximum power of the fan according to a relational expression between the rotational speed and maximum power point; and performing, by controlling a Pulse Width Modulation (PWM) switch to be toggled, system Maximum Power Point Tracking (MPPT) according to the maximum power reference current, so as to control the fan to operate stably at the maximum power point.

The present disclosure provides a fan coil unit and an air conditioning system. The fan coil unit includes: a housing, which defines an airflow inlet, an airflow outlet, and an airflow path from the airflow inlet to the airflow outlet; a cross-flow fan, which is located at the airflow inlet to introduce an airflow into the housing; and a heat exchange unit located downstream of the cross-low fan on the airflow path.

Air compressor for a vehicle having improved internal cooling efficiency by ensuring a circulation flow of compressed air for internal cooling and allowing the compressed air to sufficiently flow. The air compressor comprises: a housing with a compression unit for introducing and compressing air from outside; a motor unit which includes a rotor and a stator, and drives the compression unit to rotate according to the rotation of the rotor; a bearing unit supporting the rotor to be rotatable; a cooling circulation flow path formed inside the housing for moving, in an axial direction, some of the air compressed in the compression unit and circulating the air to the compression unit; and a bypass flow path which receives some of the air passing through the cooling circulation flow path and bypasses a partial region of the bearing unit to join the cooling circulation flow path.

A liquid-cooled heat dissipation device is disclosed, comprising a main body, a centrifugal pump, an inlet pipe, an outlet pipe, a centrifugal fan and a motor. The main body comprises a shaft hole, liquid flow channels and airflow channels. The centrifugal pump guides a cooling liquid through the inlet pipe, main body and outlet pipe. The centrifugal fan guides air into the main body axially from the shaft hole. After passing through the centrifugal fan, the air forms centrifugal airflows and leaves the body radially through the airflow channels. With an extended flow path of the cooling liquid and the radial flow of the centrifugal airflow provided by the present invention, the temperature of the cooling liquid may be quickly reduced and the cooling effect may be improved. Thus, the structure is compact, small, light-weight, easy-to-assemble.

A portable blower assembly includes a cylinder that has an exhaust port integrated into the cylinder. A handle extends around the cylinder and the handle can be gripped by a user for directing the exhaust port toward a vehicle. A blower is rotatably integrated into the cylinder to urge air outwardly through the exhaust port thereby facilitating the air to be directed onto the vehicle for drying the vehicle when the blower is turned on. A heater is integrated into the cylinder such that the heater is in thermal communication with an interior of the cylinder. The heater is positioned between the blower and the exhaust port to heat the air is blown by the blower for enhancing drying the vehicle.

This document describes a cooling device for cooling a heatsink having a plurality of cooling fins provided on a heatsink base. The cooling device includes a centrifugal fan having a fan inlet and a fan outlet, a support for mounting the fan above the heatsink, and a baffle locatable between the support and the heatsink base. The baffle defines an inlet pathway for feeding air between the cooling fins over the heatsink base to the fan inlet and an outlet pathway for expelling air from the fan outlet.

A fan-equipped heatsink includes: a heat receiving substrate made of metal; a centrifugal fan disposed on an upper surface side of the heat receiving substrate; a plate-shaped wall that is made of metal, is provided so as to stand at a position, on the upper surface of the heat receiving substrate, which is around and opposed to an outer peripheral portion having an air discharge opening of the centrifugal fan, and are provided with a plurality of through-holes that are open in a plate surface opposed to the centrifugal fan; and a lid member fixed to an upper end of the plate-shaped wall 4 and configured to close a space on the inner side of the plate-shaped wall.

A vacuum pump system includes a first vacuum pump and a second vacuum pump connected to an exhaust port of the first vacuum pump. The second vacuum pump has a pump portion and a trap portion. The pump portion has a rotor. The trap portion is configured such that a reaction product generated from gas guided to an internal space from the exhaust port of the first vacuum pump by suction by the pump portion is accumulated thereon.

Provided is a heating blower, comprising an air duct, a motor and a wind wheel arranged in the air duct, and a heating device arranged at a first air outlet of the air duct; the wind wheel is fixed to a rotating shaft of the motor; the heating device comprises a housing, an electric heater and a moving assembly; the housing is sleeved on the first air outlet, forming an inner chamber, which comprises a first area facing directly to the first air outlet and a second area not facing directly to the first air outlet; the electric heater is arranged on the moving assembly, and moves between the first area and the second area along with the moving assembly, so that an airflow blown from the first air outlet switches between a state of passing the electric heater and a state of not passing the electric heater, and is blown out from a second air outlet provided at the housing.

An integrated ceiling device includes a housing retaining an electronic assembly, a heat sink having a central opening, a light source coupled onto the heat sink, the housing is coupled with and disposed at least partly above the heat sink, and a central vertical axis of the housing aligns or is in proximity with the central opening of the heat sink.