A fan blade includes an arch-shaped body, a connecting portion, at least one sheet and at least one reinforcement component. The arch-shaped body has a pressure bearing surface and a negative pressure surface opposite to the pressure bearing surface. The connecting portion is connected to a first end portion of the arch-shaped body. The sheet is connected to the pressure bearing surface or the negative pressure surface. The reinforcement component is connected to the pressure bearing surface. An orthogonal projection of the sheet on the arch-shaped body and an orthogonal projection of the reinforcement component on the arch-shaped body are not overlapped with each other. A fan is also provided.

A thermal module including a first body, a second body, a first fan assembly, a second fan assembly, and a shaft is provided. The first body and the second body are slidably connected to each other and form an accommodating space together. The first fan assembly is disposed in the accommodating space and has a first hub and a plurality of first fan blades. The first hub is connected to the first body. The second fan assembly is disposed in the accommodating space and has a second hub and a plurality of second fan blades, and the second hub is connected to the second body. The first hub and the second hub overlap each other. The shaft is pivotally disposed in the first body and the second body and is engaged with the first fan assembly and the second fan assembly.

A cooling assembly includes an air mover and a vent panel coupled to the air mover. The vent panel includes an inlet. The cooling assembly includes a vane that is rotatable around a central vertical axis of the vane between an open position and a closed position to open and close the inlet.

A turbomachinery component of a gas turbine engine is disclosed having a number of techniques of reducing the effects of a gap flow between an airfoil member of the gas turbine engine and a wall of the gas turbine engine. The airfoil member can be variable and in one form is a variable turbine vane. In one embodiment a brush seal is included between the vane and the wall. In another form a wear surface is disposed between the vane and the wall. In yet another form a moveable member capable of being actuated to change position can be disposed between the vane and the wall to alter the size of a gap between the two.

Systems and methods for cooling a server case are disclosed. In at least one embodiment, a fan switches between an axial operation mode and a centrifugal operation mode to change a direction of an air flow within this server case.

A heat recovery unit with a unit housing (11) defining a unit compartment, a heat exchanger (20), a fresh air bypass flow passage and/or an exhaust air bypass flow passage, a fresh air centrifugal fan arrangement (41) and an exhaust air centrifugal fan arrangement (42), a fresh air filter (51) and an exhaust air filter (52).

A noise reduction method of a ventilator, comprising the following steps: S1 starting a ventilator and imputing a required wind pressure d at a man-machine interface, and then sending a signal to an actuator through a processor, and adjusting a first blade automatically to a maximum adjustable angle state a′° through the actuator and a second blade to a minimum adjustable angle state b°; S2 regulating a revolution speed, when a wind pressure is d, feeding back a revolution speed c, a conducting noise e.sub.1 and a radiated noise f.sub.1 to the processor through an acquisition device, and after the processor receives a revolution speed information, sending a command to lock the revolution speed to the actuator through the processor. The present disclosure can effectively solve the poor noise reduction function of the present noise reduction hoop, and can effectively reduce the cost and simplify the installation process.

Embodiments of a direct-drive fan system and a variable process control system are disclosed herein. The direct-drive fan system and the variable process control system efficiently manage the operation of fans in a cooling system such as a wet-cooling tower or air-cooled heat exchanger (ACHE), HVAC systems, mechanical towers or chiller systems.

Herein provided is a signal processing device for use in an aircraft engine with a variable geometry mechanism (VGM) and associated systems and methods. The signal processing device comprises a processing unit and a non-transitory computer-readable memory communicatively coupled to the processing unit. The memory has stored thereon computer-readable program instructions executable by the processing unit for: obtaining a VGM position request signal; determining whether a variation of the VGM position request signal is within a predetermined range; when the variation of the VGM position request signal is within the predetermined range: filtering the VGM position request signal to reduce a level of noise in the VGM position request signal; and transmitting the filtered VGM position request signal; and when the variation of the VGM position request signal is not within the predetermined range, transmitting a processed signal, based on the VGM position request signal.

This disclosure provides a fan, including a first case, a second case, and a reset mechanism. The first case includes a first side wall, where the first side wall has a first guide portion. The second case includes a second side wall, where the second side wall has a second guide portion. The first guide portion and the second guide portion are slidably joined and are configured to enable the first case and the second case to move toward or away from each other. The reset mechanism is connected to the first case and is configured to push the second case to move away from the first case.