Introduction to the selection of cooling fans of Taiwan fan brands.new mini rechargeable fan

　　The cooling fan is very important for the cooling of the device. Especially in the hot summer, the heat generated by the operation of the equipment is more difficult to be discharged, and the accumulation of heat can easily cause the equipment to fail, thus affecting the work efficiency. Here, Taiwan fan brands will explain the selection method of cooling fans in an easy-to-understand way.

　　For the choice of cooling fan, you may say at the beginning: Isn't the heat dissipation performance that the bigger the wind, the better the heat dissipation, so is it better to use a large fan? In fact, the air volume is not the only factor that affects the heat dissipation; Due to the limited space of the chassis, there are also great restrictions on the size of the fan. Now the mainstream game chassis basically supports two sizes of 8cm and 12cm, and a few chassis also support 14cm. Of course, the size will affect the cooling effect, but everyone can choose not strong. This article will no longer discuss.

　　In addition, you may ask: there are many LED fans now, will this affect the heat dissipation? The answer is no. The more popular LED lighting cooling fans are only for aesthetics and to create a dazzling effect, which is not helpful for heat dissipation. But if you like the lighting effect, you can choose this kind of fan, which will bring a different visual enjoyment when installed in the chassis.

　　Okay, after talking about two misunderstandings that everyone knows, let's move on to the topic. Efficient mute, high efficiency Needless to say, naturally the higher the heat dissipation efficiency, the better; so what is the standard for mute? In theory, the human ear is not very keen to perceive the sound below 20dBA, which can be used as a measure. Of course, this also has to be Subject to availability. Next, let the author show you how to choose an efficient and quiet fan.

　　Don't be foolish to distinguish the wind pressure and air volume

　　First of all, I want to popularize the concepts of air volume and air pressure. Many people may ask, aren't air volume and air pressure the same thing? In fact, air volume and air pressure are relative. At the same speed, the larger the air volume, the smaller the air pressure, and vice versa. The higher the wind pressure, the smaller the air volume. The size of the air volume and air pressure is the embodiment of the overall cooling performance of the fan, and is the first standard to pay attention to when purchasing a fan.

　　To put it simply, the wind pressure is the pressure of the wind. The greater the wind pressure, the greater the power of the wind, which can blow a farther distance in the chassis; and the air volume can be understood as the amount of airflow passing through the fan at the same time. Over time, more airflow can be exchanged to improve heat dissipation.

　　The choice of an air pressure type fan or an air volume type fan can be determined according to the design of the air duct of the chassis. The air pressure type fan is more suitable as an intake fan to blow cold air through the chassis, while the air volume type fan is suitable as an exhaust fan to efficiently remove the chassis. heat.

　　Fan speed and intelligent adjustment are not inconsistent

　　The speed of the fan directly affects the air volume generated by the fan, thereby affecting the heat dissipation performance of the fan, but the speed of the fan is also in contrast to the noise value. The faster the fan speed is, the higher the noise value. Therefore, it is very important to achieve a balance between heat dissipation and noise.

　　The speed of the fan refers to the number of times the fan blades rotate per minute, and the unit is RPM. Of course, the higher the speed of the fan, the larger the noise. Some fans will simply pursue high speed, which may bring huge noise and may not bring corresponding large air volume due to unreasonable fan blade design.

　　Now many fans have begun to support intelligent adjustment, which is a good design, because the chassis is not always in a high temperature state. When the temperature of the chassis is not high, the fans do not need to run at high speed. It can reduce noise, and secondly, it can also achieve energy saving. There is a very simple way to judge whether a fan supports intelligent adjustment. It is to see whether the fan power interface is a 3pin interface or a 4pin interface. The fan that adopts the 4pin interface is the fan that supports intelligent adjustment (does not rule out fraud by unscrupulous merchants).

　　The higher the fan speed, the larger the air volume and the higher the noise. The designer should determine the required fan speed according to the air volume required by the platform. In addition, it is necessary to choose a fan that can be adjusted intelligently. Now mainstream chassis supports the intelligent adjustment function to achieve The balance of heat dissipation and quietness.

　　Bearing selection is related to durability

　　The fan is mainly composed of a fan frame, a fan blade bracket and a bearing. The design of the bearing is related to the durability and noise value of a fan. At present, cooling fans are mainly divided into two categories: oil-impregnated bearings and ball bearings. Among them, oil-impregnated bearings are relatively cheap, but slightly less reliable; ball bearings are more expensive, and their reliability is correspondingly better. The more popular single ball bearings before, because it is difficult to control the reliability, there are not many.

　　Among non-big brand consumer electronic products, Sleeve Bearing is the most commonly used fan bearing. It uses lubricating oil as lubricant and drag reducing agent, which has the advantages of very low price and relatively low operating noise during initial use. The disadvantage is that the bearing is easy to wear and has a short life. In addition, when the bearing is used for a long time, the lubricating oil in the bearing sleeve will easily leak out, the noise will increase, and it will contaminate the main board and other accessories.

　　Fan blade design is very important

　　The more vertical the fan blade is, the larger the wind section, the greater the air volume generated, and the greater the wind shear noise; the straight fan blade is selected for no wind and less wind, not to mention heat dissipation. And the number of fan blades and the design of the fan blades will also have a great impact on the air volume and wind pressure.

　　Fans are mostly designed with 7, 9, 11 and other fan blades. Many friends will be curious about why they are all odd, because even-numbered fan blades with symmetrical shape, if the balance is not adjusted, it is easy to cause resonance, which will affect the operation of the fan. If the fan is heavy, it will damage the fan. The design of the odd-numbered fan blades with asymmetric axis can effectively avoid this problem.

　　Many of the blades of the fan blades are designed with air guide grooves, which can guide the air volume to form a gathered wind pressure, and can effectively reduce the wind resistance, thereby reducing noise.

　　The radian of the fan blade is small and relatively straight, the wind sent out is relatively scattered, and the wind pressure is small; and the design of a certain radian can concentrate the airflow and effectively increase the wind pressure.

　　The design of the fan blade has an obvious impact on the performance of a fan. At the same speed, a product with an excellent fan blade design can provide greater air pressure and air volume, resulting in better heat dissipation.

　　Rubber shock pad design is more quiet

　　Of course, the design and texture of an excellent cooling fan are not enough to maximize its performance, because a fan manufacturer with high cooling efficiency will also focus on its detailed design.

　　The fan will vibrate and generate noise when it rotates. The use of rubber shock-proof pads in the fan mounting holes can effectively slow down the vibration and reduce noise.

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