What is the main purpose of the heat sink? What are the classifications of heat sinks?

Heat sinks. It is mainly used in the host of the computer, because the computer is heated up during use, so there will be a heat sink to dissipate some heat.

Hello, the use is as follows:

The principle of heat sink heat dissipation is to increase the surface area and speed up the heat dissipation. As a heat sink material, it is a metal with less specific heat, which absorbs heat quickly, and at the same time loses heat relatively quickly, so that it can quickly dissipate heat through heat transfer.

For example, the CPU ** processor in the computer should use a considerable heat sink, and the power pipe, line tube, and power amplifier tube in the TV should use the heat sink.

Generally, the heat sink should be coated with a layer of thermal grease on the contact surface between the electronic components and the heat sink in use, so that the heat emitted by the components is more effectively conducted to the heat sink, and then dissipated into the surrounding air through the heat sink.

As far as the heat sink material is concerned, the thermal conductivity of each material is different, and it is ranked from high to low according to the thermal conductivity, which is silver, copper, aluminum, and steel. However, it would be too expensive to use silver for the heat sink, so the best solution is to use copper. Although aluminum is much cheaper, it is obviously not as thermally conductive as copper (only 50% of copper).

Conducts the heat emitted by the components more efficiently.

Heat sink is a kind of heat dissipation device for easy to heat electronic components in electrical appliances, mostly made of aluminum alloy, brass or bronze into plates, sheets, multiple sheets, etc., such as the CPU ** processor in the computer to use a considerable heat sink, the power tube in the TV, the line tube, the power amplifier tube in the power amplifier to use the heat sink.

The heat sink is mainly used in the hot place, and the hot place is used to dissipate heat to prevent it from being damaged by high temperatures, such as some of the chargers or the generator factory.

1. Endothermy - absorb the heat of the small volume and area of the heat break, so that they will not rise sharply due to the accumulation of heat, resulting in various failures.

2. Heat conduction - the original absorbed heat is conducted to all parts of the heat sink internally, and the larger heat capacity and surface area are fully used to conduct heat.

3. Heat dissipation - heat is lost into the air through various heat exchange pathways (mainly heat convection) on the surface (forced convection can be carried out with fans).

The purpose of the radiator, as the name suggests, is used to conduct and release heat, mainly used for winter heating in the northern region, the specific principle is to increase the air flow rate and flow through the radiator, and increase the heat dissipation capacity of the radiator.

The main purpose of the heat sink is to reduce the heat and use the machine method to cool down.

Heat sink, heat sink, as the name suggests, is a thing used to dissipate heat, and it can also make the heat a little less.

There are many types of heat sinks:

The heat dissipation method of the radiator is radiant heat dissipation plus convection heat dissipation. Compared with the direct blowing heating method of air conditioning, the human body feels more comfortable, easy to use, can adjust the temperature freely, no blowing feeling, high comfort, and heating is not dry. If you use too much electric heating, it will dry out and catch fire, and the radiator is a water circulation for heating, which will not lead to dryness and fire.

Electronic heat sink is usually a heat sink for heat dissipation of high-power electronic components, no external power supply, natural cooling, most of them are made of aluminum alloy profiles, cut into the required size according to the size of the components, such as the heat sink of high-power switch or transistor. Of course, in special cases, ultra-high-power electronic components also have cooling fans, such as the switch tube of the switching power supply, which must be equipped with a cooling fan.

I don't know which one you're talking about.

1. Aluminum extruded heat sink.

Aluminum material due to its soft and easy processing characteristics have been used in the radiator market for a long time, aluminum extrusion technology is simply to heat the aluminum ingot at high temperature, let the aluminum liquid flow through the extrusion die with grooves under high pressure, make the heat sink embryo, and then cut the heat sink embryo after cutting, trenching and other treatments to make a common heat sink.

The cost of aluminum extruded heat sink is low, and the technical threshold requirements are not high, but due to the limitation of its own material, the ratio of the thickness and length of the heat sink can not exceed 1:18, so it is difficult to increase the heat dissipation area in a limited space, so the heat dissipation effect of aluminum extruded heat sink is relatively poor, and it is difficult to be competent for today's rising high-frequency CPU.

2. Plug copper heat sink.

The main materials used in the mainstream heat sink in the market are nothing more than aluminum and copper, and the copper plug process is the product of combining the respective advantages of aluminum and copper.

The copper plugging process is completed by using the principle of thermal expansion and cold contraction, and the copper core is plugged into the aluminum extruded heat sink after heating, and finally the overall cooling is carried out.

Since no third-party medium is used, the Secha copper leasing process can greatly reduce the thermal resistance between the contact surfaces, which not only ensures the tightness of the copper-aluminum bond, but also makes full use of the characteristics of fast heat dissipation and fast heat absorption of copper. This copper plugging process has a moderate cost and good heat dissipation effect, and is the mainstream heat sink type on the market.

3. Pressing method.

That is, a large number of copper or aluminum sheets are stacked on top of each other, and then pressurized on both sides and polished with a cross-section that is in contact with the CPU core and the other side is stretched out and buried as a fin for the heat sink.

4. Forged heat sink.

The forging process is formed by heating the aluminum block and using high pressure to fill the mold, its advantage is that the height of the fin can reach more than 50mm, the thickness is less than 1mm, and the maximum heat dissipation area can be obtained in the same volume, and the forging is easy to get good dimensional accuracy and surface finish.

However, during forging, due to the low plasticity of the metal, it is easy to crack when deformed, and the deformation resistance is large, and a large ton (more than 500 tons) of forging machinery is required, and the product cost is extremely high because of the high cost of equipment and molds.

Categories: Computer, Networking, >> Hardware.

Problem description: My computer sometimes makes a loud noise when it turns on.

Sometimes the sound suddenly becomes louder during use, and as soon as the case is opened, the sound immediately becomes quieter.

I'd like to ask if it's the heatsink or the fan.

Thank you! Analysis:

There are several kinds of loud sounds:

1.If there is a booming resonance sound, you should check that your chassis is not deformed and that all hardware is properly secured. (Mainly the fixation of the case cover.) ）

2.If it's a whistling sound of air, it's normal, it's a matter of temperature control and heat dissipation, and the fan will work faster when the temperature of your system rises. The only way to solve this problem is to buy a fan governor, or change to a silent radiator.

3.If it's a plastic knock, tidy up your case wiring to see if your power cord is too close to the fan.

1.Endothermic - absorbing the heat of a small volume and area of a hot object, so that it does not rise sharply due to heat accumulation, resulting in various undesirable consequences; 2.Thermal conductivity - conducts the absorbed heat internally to all parts of the heat sink, making full use of the large heat capacity and surface area; 3.

Heat dissipation - heat is lost into the air through various heat exchange pathways (mainly heat convection) on the surface (forced convection can be carried out in conjunction with fans);

Heat absorption, heat conduction, heat dissipation. The heat sink is used on the radiator, such as the aluminum profile radiator of Xihe Radiator Factory, the heat dissipation can be naturally cooled, or air cooled and water cooled, which should be decided according to the heat generation and heat dissipation requirements of the equipment.

Heat sinks mainly include: cast iron radiators, steel radiators and aluminum alloy radiators.

1. Cast iron heat sink.

Cast iron radiators can be divided into column type and airfoil type according to their shape, while airfoil radiators are divided into round airfoil type and long airfoil type. Cast iron radiator has the advantage of corrosion resistance, but the pressure should not be exceeded, and the weight is large, and the labor intensity is high when assembling, and it is suitable for heating systems with less than working pressure, or in buildings not more than 400m high. Airfoil radiators are mostly used in factory workshops, and column types are mostly used in private buildings.

2. Steel heat sink.

Compared with cast iron radiators, steel radiators have the advantages of less metal consumption, high compressive strength, beautiful and tidy appearance, small size, less land occupation, easy layout, etc., but they are susceptible to corrosion and short service life, and are mostly used in high-rise buildings and high-temperature water heating systems, and cannot be used in steam heating systems, nor are they easy to be used in heating rooms with high humidity.

3. Aluminum alloy heat sink.

With the development and progress of society, people put forward higher requirements for the performance and aesthetics of radiators. With its outstanding advantages, aluminum alloy stands out and quickly occupies the market, becoming an ideal choice for radiator upgrading. Its characteristics are:

The pressure resistance and heat transfer performance are significantly better than those of traditional cast iron radiators; The appearance is elegant, with strong decoration and ornamentality; Small size, light weight, simple structure, easy to transport and install; Corrosion-resistant and long-lasting. Aluminum alloy radiators are mainly in the form of airfoil and closed type.

Precautions when choosing a radiator.

Looking at the shape, the fin-shaped radiator is bent through a thin aluminum plate and looks like an accordion bellows; Vortex heat sinks have each heat dissipation blade tilted in one direction to help with air circulation. The heat dissipation efficiency of these two products is relatively strong.

Looking at the material, the radiator of the aluminum extruded profile is the lowest, but the heat dissipation effect is not good; The heat dissipation effect of gold, silver and copper radiators is good, but the cost is high and the weight is large. The most cost-effective is the radiator made of aluminum alloy.

Looking at the area, the heat sink dissipates the heat in the form of convection, and the larger the surface area, the better the heat dissipation effect. When choosing a radiator, you should also pay attention to the heat dissipation area of the radiator.

Classification: Conducts heat emitted by components more efficientlyCopper heat sink cCopper-aluminum combined heat sink dHeat pipe heatsink eIron heat sink fGraphite heat sink gAluminum profile heat sink hAluminum plate heat sink.