A neck fan includes: a shell, defining an air inlet, a receiving space, an air duct, and an air outlet, that are communicated with each other; and fan assemblies, received in the receiving space. The fan assemblies are configured to intake air from an outside of the neck fan through the air inlet and to drive the air to flow along the receiving space and the air duct to reach the air outlet; each fan assembly includes a fan and a motor configured to drive the fan to rotate. The air inlet has an air inlet plane perpendicular to an air inlet direction in which the air at an outside of the neck fan is intaken into the neck fan; an angle is formed the air inlet plane and a direction in which the neck fan is worn to the neck and is between 0 degrees and 90 degrees.

A neck fan is provided and is configured to be worn around a neck of a user. The neck fan includes: a shell, defining a receiving channel; and two centrifugal fans. One of the two centrifugal fans is disposed at an end of the receiving channel, and another one of the two centrifugal fans is disposed at another end of the receiving channel. Each of the two centrifugal fans includes: a plurality of blades, configured to rotate to intake air from an outside of the centrifugal fan to generate wind; and a vortex tongue structure, including a pressurizing plate and a wind guiding plate connected to the pressurizing plate. The pressurizing plate is a curved wall arranged around ends of some of the plurality of blades, the wind guiding plate protrudes from and is extending away from an outer surface of the pressurizing plate.

A neck fan is provided and is configured to be worn around a neck of a user. The neck fan includes: an outer shell, disposed away from the neck; an inner shell, connected to the outer shell and disposed near the neck, wherein the inner shell and the outer shell cooperatively define a receiving space. A plurality of air outlets are defined in the inner shell.

A neck fan is provided and is configured to be worn around a neck of a user. The neck fan includes: an outer shell, disposed away from the neck; an inner shell, connected to the outer shell and disposed near the neck, wherein the inner shell and the outer shell cooperatively define a receiving space. A plurality of air outlets are defined in the inner shell.

A wearable air purifier is provided and includes a headgear, an air delivery mask, and a fan. The air delivery mask is connected to the headgear and bounds an air delivery region. The air delivery mask is further configured to define a first airflow path to deliver a flow of air to the air delivery region. The headgear defines a second airflow path. The fan is configured to direct airflow to the first airflow path and the second airflow path.

A method of cooling a prosthetic socket includes placing a thermally conductive heat spreader including a curved shape portion in contact with a residual limb of a user, placing a heat extraction subsystem through a wall of the prosthetic socket and coupling the heat extraction subsystem to the thermally conductive heat spreader, and operating the heat extraction subsystem to drive heat from inside the prosthetic socket to an external environment using the thermally conductive heat spreader and the heat extraction subsystem such that a desired temperature is maintained in the prosthetic socket.

A neck fan includes an arc-shaped shell and a fan assembly. The arc-shaped shell is configured to be worn around a neck of a user. The shell has a first side and a second side opposite to the first side. Each of the first side and the second side defines air inlets. At least one of the first side and the second side defines air outlets. The shell further defines a receiving space, and the receiving space includes an air duct communicating with the air inlets and outlets. The fan assembly is received in the receiving space and configured to drive the air to flow from the air inlets of both sides, through the air duct, reaching the air outlets.