this article relates to a portable fan, in particular to a computer accessory cooling fan .

with the development of science and technology and the improvement of people's living standards, computers have been widely used in people's daily work and life, so people usually have to sit in front of computers to deal with affairs.if they are using notebook computers, they may sometimes be in the dark without electricity and hot environment, so it will bring discomfort to users. However, the current portable heat dissipation fan needs to use a battery or be directly connected to the mains supply, so this type of portable heat dissipation fan is inconvenient to use. Today, whether it is desktop computer or notebook computer the brain has a USB interface device.the USB interface device is characterized in that there are four branch lines in the electric wire, two of which are signal lines for transmitting data signals, and the other two are power lines for supplying low voltage (about 5v) and low current (about 250ma).therefore, the USB interface device of the computer has the ability to provide low voltage and low current for other equipment.

the purpose of this paper is to provide a portable cooling fan powered by a computer, that is, a computer-attached cooling fan.

the technical scheme adopted in this paper is:to provide a computer-attached heat dissipation fan, which includes fan blades, fan blade fixing seats, power lines, micro motors and USB connectors.the USB connectors are connected with the micro motors through the power lines to control the rotation of the fan blades.

the beneficial effect of this paper is that the computer-attached heat dissipation fan in this paper is small in size and convenient to use because it uses USB connector to obtain power from the computer's USB interface device, thus making the fan not need to use battery or be directly connected to commercial power.

fig.2 is an exploded view of the auxiliary cooling fan of the computer shown in fig.1.

。 Both ends of the power lines 121 and 122 are respectively connected with the USB connector 11 and the micromotor 15 to obtain power from the USB interface device of the computer through the USB connector 11 and transmit the power to the micromotor 15 through the power lines 121 and 122; The flexible hose 12 is sleeved on the power cord 121 and 122 to protect the power lines 121 and 122; The plastic shell 13 is sleeved outside the micro motor 15 to protect the micro motor 15; Fan blades 14 are fixed therein by fan blade fixing seats 18 and 19; The micro motor 15 is fixed on the motor fixing seat 17, and the fan blade fixing seat 19 is fixed with the motor the fixed seat 17 is connected by screws 16. In addition, the flexible hose 12 may be replaced by a hard tube.

when the cooling fan 10 attached to the computer is inserted into the USB interface device of the working computer, the USB connector 11 obtains power from the USB interface device of the computer and transmits it to the micro motor 15, which then drives the fan blades 14 to rotate.

or respectively control the opening and closing of the light emitting device 21 and the rotation and stop of the fan blades 24.