What is a System Fan? What is Electric Fan?

This reminds me of a deliberate idea, IBM's after-sales service staff always follow **. Excuse me, which key is any key and where is it on the keyboard.

Related to this, the fan in the computer system refers to the cooling of the computer hardware in the computer system, and the exhaust air (in fact, it is to speed up the internal and external circulation) style. Typically, computers have power supply fans, fans to cool the CPU, and graphics card fans.

If it is overclocking or other reasons, such as the chassis used in the industrial control, it is very likely that there is a fan for cooling in the cabinet.

In other words, a system fan refers to a collection of fans that play a role in speeding up heat dissipation in a computer system, rather than a single fan called a "system fan." ”

systems

Fan is not a CPU fan, it is a fan interface connected to a fan interface in the middle right of the motherboard (with the CPU side as the top, the PCI side as the bottom), the specifications of this interface are the same as the CPU fan, and it is rarely used now, 0 is normal (I believe you should not have installed this fan).

In addition, this interface is relatively close to the graphics card, and you can fix a CPU fan on the graphics card to connect it to use here (some knockoffs and refurbished goods are made like this).

A system fan is a fan that is installed inside the chassis to increase air convection to the chassis to assist in cooling. The SYS Fan power connector connected to the motherboard is required.

A system fan is a fan that dissipates heat from the chassis as a whole.

The system fan doesn't have to be on the motherboard.

Like in the server chassis. The back under the power supply, and the front and back can be called system fans.

The fan used to dissipate heat inside the main unit.

Can dissipate heat! You have to install a cooling fan inside the host.

The one that gives you signs of heat dissipation for your computer is also used for CPU cooling.

An electrical appliance that can generate wind!

The fan is a kind of summer heat-off utensil, which has evolved in different forms from ancient times to the present, and now mostly refers to electric fans driven by electricity.

The fan refers to the utensils used to generate wind and cool in hot weather, and the electric fan produced by modern technology is a device that uses electricity to drive and generate airflow.

Origin of mechanical fan On the roof, James Byron invented a mechanical fan that can be fixed on the ceiling and driven by a clockwork, and later a man named Joseph developed a mechanical fan driven by a gear chain device, and at the end of the 19th century, the American Schuler first installed the blades directly on the electric motor and made the world's first electric fan.

Fans can be divided into two kinds according to the working mode, one is the parallel fan, the parallel dual fans are sensitive to air pressure or unchanged, but the air volume will rise, and the air volume will increase, so the heat dissipation effect will increase; The other is a series fan, which is to increase the air pressure, but the air volume remains unchanged, this method can not solve the problem of heat dissipation, and is generally used when the resistance near the wind is too large to ensure the air volume.

If the fan is classified according to the motor structure, it can be divided into: single-phase capacitive type, single-phase shaded pole type, three-phase induction type, DC and AC/DC dual-purpose series commutator type, DC permanent magnet, DC brushless electric fan.

<> Introduction: Usually a hand-held semi-automatic small fan, its appearance is close to the electric small hand-held fan, the difference is that the power is a simple device for a person to rework hand pressure, which can be directly converted into mechanical energy or converted into electrical energy and stored in the built-in small battery or external battery that can be installed in the pressure fan, and its working principle can be referred to and the pressure flashlight.

Advantages: Environmentally friendly and easy to crack.

Fan: A fan is a device used to generate wind and cool down on a hot day. The electric fan is a device that is driven by electricity to generate clear and closed airflow, and the fan configured in it rotates into natural wind after being energized to achieve the effect of cooling.

Electric fan, also known as fan and fan, is a household appliance that uses an electric motor to drive the fan blades to rotate to accelerate the circulation of air, mainly used to cool off the heat and circulate the air. It is widely used in homes, classrooms, offices, shops, hospitals and hotels.

Common household fans are essentially axial fans, i.e., the direction of the wind is parallel to the axis of rotation of the fan blades.

An electrical appliance that is driven by an electric motor to make the air flow move.

It is impossible to verify who invented the electric fan. It is said that in 1882, Huey Scatz Hoira, the chief technician of the Crocazykazis Engine Factory in New York, USA, was the first to invent a commercial electric fan. The following year, the factory began mass production, and the electric fan at that time was a desktop electric fan with only two blades.

In 1908, the American Eco Engine and Electric Company successfully developed the world's first gear-driven electric fan that shook head left and right. This electric fan prevented unnecessary 360-degree rotor air supply, and became the mainstream of future sales.

The electric fan is a kind of household appliance, when the motor rotates, it drives the rotation of the fan blades, so that the still air flows under the action of the fan blades, which is called an electric fan.

An electrical appliance used to dissipate heat. The structure of the fan: the rotor:

It is composed of magnets, fan blades and shafts; Stator: composed of silicon steel sheet, coil and bearing; Control circuit: The N S pole of the IC induction magnet is controlled by the circuit to turn on its coil and generate internal excitation to rotate the rotor.

Type: Axial Fan, DC Fan Selection: Overall Cooling Requirement Q = CP M A T = D CP CFM T Parallel Fan and Series Fan:

Parallel fan: The air pressure of the two fans connected in parallel does not change, but the air volume increases. If the heat dissipation power is too small in the design, you can consider adding a fan to solve the problem.

Series fan: The result of series fans is that the air pressure increases, but the air volume does not change. The second method is not able to solve the problem of heat dissipation, and it is generally used to ensure the air volume when the resistance near the wind is too large.

Noise level In order to achieve low noise, the following points must be taken into account: System impedance: The resistance of air flow will cause the flow noise of the air to be generated.

Turbulence of airflow: Due to the poor design of the flow channel, there will be high-frequency noise in the turbulence of the air, and it is difficult to improve the quality if the flow channel is not improved. Fan speed and size:

The faster the speed of the fan, the better the heat dissipation effect, and the larger the size of the fan, the larger the air volume, the better the heat dissipation effect. The higher the speed of the fan, the louder the noise, and the larger the size, the louder the noise. Rise in temperature:

When the temperature rises and the temperature difference decreases, the heat dissipation effect decreases. Vibration: Vibration can cause the fan to increase noise, reduce life, and reduce speed.

Voltage fluctuations: Voltage fluctuations can cause fan speed changes, making operation unstable and generating additional noise. Design Considerations:

Other design requirements must also be taken into account to ensure heat dissipation. Fan: 1. The distance of the fan into the air:

The distance of 3 5mm is a must 3mm - the efficiency of the fan is 80 4mm - the efficiency of the fan is 90 5mm - the efficiency of the fan is 100 2, different air inlets and outlets will cause a great change in airflow resistance, of course, the larger the opening of the inlet and outlet, the better. 3. Do not place blocking objects (such as chips and interfaces, etc.) near the air inlet of the fan, otherwise it will reduce the air flow of the fan. 4. It is better to use rubber to fix the fan, instead of metal screws, so as to avoid vibration.

5. The space design of the fan. For the efficiency and noise of the fan, it is necessary to ensure that the distance between the fan blades and the fan housing is 5 1omm. The blades of the fan must be close to the tongue for better efficiency.

Fan explained.

1) [fan] A tool or device that generates artificial air flow (e.g., making a wide surface flutter or whirlwind motion) 2) [electric fan] A device that uses electricity to drive the flow of air Explain in detail A device used to generate wind and cool air on a hot day. This refers to the electric fan. Southern Dynasty Qi Xiao Ziliang "The Four Gates of the Pure Residence and the Four Gates of the Pure Practice: The Four Great Gates":

Zheng judged that "if the season is steaming in summer, Xi He is scorching, and the complex must be light and wide, and the fan is toothy." Qing Wang Shizhen "Chibei Occasional Talk, Talking about Different Four, Wind Mill Fan": There is also a fan, shouting that the curtain is hung high in the tent, and the hair is used to face it, and the rope is set to pull it, and there is naturally wind, so there is no need to wave the fan.

Lu Xun "Lace Literature · Know the World": At the same time, I turned on the fan and ate ice cream. ” 1).

It is said that the wind is preached. Jin Luji's "Praise of Confucius": Confucius is a saint, with Tianhong Dao.

Fan Xuanliu, thinking about the treasure. ” 2).The wind blows.

Ming Shen Zhou's poem "Autumn Rain Puppet Book": "The fan is not worried about the banana breaking the leaves, and the rain room is afraid of the rice hurting the flowers." ”

Word decomposition Explanation of wind Wind (wind) The phenomenon of air flowing. Meteorology specifically refers to the movement of air in a horizontal direction: the direction of the wind.

Wind velocity. Wind level. Risk.

Turmoil (metaphor for disputes or chaos). Stormy (a refers to the constant wind and rain, the sky is dark, giving people a feeling of heavy pressure; b metaphor * or difficult situation). Wind Flower Snow Moon Fan Explanation Fan à Shake the utensils that give birth to wind and take coolness:

Fan. Fan pendant (ornament at the lower end of the fan handle). Fan.

Sector. Fingerboard or sheet screen: door leaf.

Partition sliding. Measure word, used for doors, windows, etc.: a door.

Fan ā Shake a fan or something else to accelerate the flow of air into wind: fan with a fan. Drum.