CN216437812U - Pump-free cooling device based on thermomagnetic effect - Google Patents

Abstract

A pumpless cooling device based on thermomagnetic effect, including PC tube, copper-aluminum composite fin radiator, red copper block, permanent magnet, fan and carbon nanotube/manganese-zinc ferrite nanofluid, above the red copper block is The liquid injection hole sealed by the rubber plug, a porous nano metal layer is arranged inside the red copper block, and the bottom of the red copper block is tightly combined with the electronic chip through a fastener; the inner cavity of the PC tube and the inner cavity of the red copper block are connected to each other, and the cavity is filled with carbon nanotubes /Manganese-zinc ferrite nanofluid as heat transfer medium; the permanent magnet is sleeved on the fluid pipeline, the inner cavity is not in contact with the fluid pipeline, but relies on the silicone rubber gasket as support; carbon nanotube/manganese-zinc ferrite nanofluid It flows through the copper-aluminum composite fin radiator, and the copper-aluminum composite fin radiator is located in the air outlet direction of the fan. The utility model reduces the equipment cost, the fluid flow can be controlled by the permanent magnet and the temperature, the structure is very simple, and it can be completely closed.

Description

A pumpless cooling device based on thermomagnetic effect

technical field

The utility model relates to a cooling device for an electronic chip, which belongs to the technical field of heat exchange.

Background technique

At present, power electronic equipment is widely used in all aspects of people's life, especially in important fields such as national defense, military industry, and communications. Therefore, the stable operation of power electronic equipment plays an important role, and its reliability has become the focus of attention today.

Among the many factors that affect the reliability of power electronic devices, heat dissipation is one of the most important ones. Generally, the operating temperature of power electronic components has a certain limited range. If the operating temperature exceeds this range, the performance of the components will be significantly reduced, and it will not work stably, thus affecting the reliability of the system operation. With the development of power electronic technology, processing technology and large-scale and ultra-large-scale integrated circuits, the heat dissipation problem of power electronic equipment has attracted more and more attention, especially in the field of high-power applications. Therefore, in product design, choosing an appropriate heat dissipation method and carrying out a reasonable design is one of the indispensable and important links to make the potential of the device fully play and improve the reliability of the device.

At present, the cooling of electronic devices mainly includes fan cooling and liquid cooling. Air cooling often requires multiple fans to work together, so in actual use, there are problems such as high noise, large volume, and general cooling effect. Began to use liquid cooling as the main cooling means. At present, liquid cooling often uses mechanical pumps as power to drive liquid flow, but existing mechanical pumps often face problems such as vibration of moving parts, noise and high power consumption. leakage, causing damage to electronic chips. As a commonly used cooling medium for liquid cooling, water also has the problem of low thermal conductivity, and the advantages of high thermal conductivity and good heat transfer performance of nanofluids have gradually attracted attention and become a new type of enhanced heat transfer medium.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of existing mechanical pumps that often face noise, leakage and vibration of moving parts, the utility model provides a pumpless cooling device based on thermomagnetic effect, which does not require the drive of a mechanical pump, reduces equipment costs, and can use permanent Magnets and temperature are controlled, no energy consumption is required, the device contains no moving parts or electrodes, the structure is very simple, and it can be completely enclosed.

The technical scheme adopted by the utility model to solve its technical problems is:

A pumpless cooling device based on thermomagnetic effect, including PC tube, copper-aluminum composite fin radiator, red copper block, permanent magnet, fan and carbon nanotube/manganese-zinc ferrite nanofluid, above the copper block is The liquid injection hole sealed by the rubber plug, the red copper block is provided with a porous nano metal layer, and the bottom of the red copper block is tightly combined with the electronic chip through a fastener; the inner cavity of the PC tube and the inner cavity of the red copper block are connected to each other, and the cavity is filled with carbon nanotubes / Manganese-zinc ferrite nanofluid as heat transfer medium; permanent magnet is sleeved on the fluid pipeline, the inner cavity is not in contact with the fluid pipeline, but relies on silicone rubber gasket as support; carbon nanotube/manganese-zinc ferrite nanofluid It flows through the copper-aluminum composite fin radiator, and the copper-aluminum composite fin radiator is located in the air outlet direction of the fan.

Further, the red copper block is a cuboid with an internal opening, and the permanent magnet is a cylindrical shape with an opening.

There is no need for an external mechanical pump as power, but it relies on the thermomagnetic effect of carbon nanotube/manganese-zinc ferrite nanofluids to flow spontaneously. The radiator is copper-aluminum composite fins, and an external fan is applied to cool down.

Further, the inside of the red copper block at the heat-conducting end is a porous nano metal layer, and the inner cavity is a sudden expansion pipeline. The inner diameter of the pipeline entering the red copper block from the PC tube is smaller, while the inner diameter of the red copper block is slightly larger, which strengthens the carbon nanotubes. Convective heat transfer of Mn-Zn ferrite nanofluids.

The nanofluid is carbon nanotube/manganese zinc ferrite nanofluid, the volume fraction of the nanoparticle is 3-5%, the particle size of the nanoparticle is 10-30nm, and the base fluid of the nanofluid is ethylene glycol.

The beneficial effects of the present utility model are mainly manifested in:

1) It does not require the drive of a mechanical pump, and the fluid can flow spontaneously, avoiding the defects of traditional equipment such as noise and energy consumption, and reducing equipment costs.

2) The fluid flow can be controlled with permanent magnets and temperature without energy consumption.

3) The device contains no moving parts or electrodes, the structure is very simple, and it can be completely enclosed.

5) The device is self-regulating because as the heat load increases, the difference in magnetization inside the fluid increases and the driving force increases, allowing the fluid to circulate at a faster rate and transfer heat faster from the heat source go out.

6) Temperature-sensitive magnetic fluid Manganese-zinc ferrite has suitable Curie temperature, large thermal magnetic coefficient, carbon nanotube has high thermal conductivity, avoids the agglomeration of manganese-zinc ferrite, reduces the grain size of the material, etc. Features: Manganese-zinc ferrite is wrapped in carbon nanotubes to form carbon nanotube/manganese-zinc ferrite composite nanoparticles, forming nanofluids with high magnetization and high thermal conductivity.

7) The porous nano metal layer increases the contact area with the nano fluid, and enhances the heat transfer of the chip to the fluid.

8) Using fin type radiator, small size, simple structure and good heat dissipation effect.

Description of drawings

FIG. 1 is a schematic diagram of the overall device structure of the application

FIG. 2 is a schematic cross-sectional view of the red copper block of the present application

3 is a schematic cross-sectional view of the permanent magnet of the application

In the picture: 1-PC pipe; 2-PVC 90-degree elbow; 3-copper block; 4-permanent magnet; 5-steel-aluminum composite fin radiator; 6-fan; 7-carbon nanotube/manganese-zinc ferrite Composite nanofluid; 8-silicon rubber gasket; 9-porous nano-metal layer; 10-liquid injection hole.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 3, a pumpless cooling device based on thermomagnetic effect includes PC pipe 1, PVC 90-degree elbow 2, red copper block 3, permanent magnet 4, steel-aluminum composite fin heat pipe 5, fan 6 and The liquid injection hole 10 , the PC pipe 1 , the PVC 90-degree elbow 2 , the red copper block 3 and the copper-aluminum composite finned tube 5 together constitute the flow pipeline.

The carbon nanotubes surface-treated by concentrated nitric acid needs 4% mass fraction, and the manganese-zinc ferrite needs 2% volume fraction. The manganese-zinc ferrite is wrapped in the carbon nanotubes, and water is added as the base liquid to form the particles of nanoparticles. A nanofluid with a diameter of 10-30nm and a volume fraction of 3-5%. The carbon nanotube/manganese-zinc ferrite nanofluid 7 combines the high thermal conductivity and high heat capacity of carbon nanotubes with the suitable Curie temperature and large thermomagnetic coefficient of manganese-zinc ferrite. Nanocomposite fluids suitable for electronic device cooling are formed.

The heat dissipation end adopts a steel-aluminum composite fin heat pipe 5, and a fan 6 is used for heat dissipation. And the diameter of the pipeline of the radiator is larger, which can simultaneously function as a water tank and accommodate more fluids. Due to the constant volume flow, the larger the cross-sectional area, the lower the flow rate, the longer the fluid stays in the radiator, and the better the cooling effect can be achieved.

As shown in Figure 2, the red copper block 3 has a high thermal conductivity, the bottom is a square structure, the outside is tightly combined with the electronic chip through a fastener, and the heat of the electronic chip is transferred to the inside of the red copper block, and the inner hole is opened to connect with the carbon nanotubes. The porous nano metal layer 9 in close contact with the manganese-zinc ferrite composite nanomaterial 7 can increase the contact area and enhance heat transfer. The sudden expansion pipe is used at the entrance of the red copper block, which causes strong disturbance to the fluid and enhances the convective heat transfer of the fluid.

As shown in FIG. 3 , it includes a PC tube 1 , a permanent magnet 4 , and a silicone rubber gasket 8 . Carbon nanotube/manganese-zinc ferrite nanofluid 7 behaves differently under different magnetic field conditions. This device uses hollow cylindrical galvanized rare earth NdFeB N52 cylindrical perforated permanent magnet 4, and the inner cavity of permanent magnet 4 is not connected to the PC tube. Road contact, but rely on the silicone rubber gasket as a support, so as to achieve a better effect.

The content described in the embodiments of the present specification is merely an enumeration of the realization forms of the idea of the utility model, and is only used for illustration purpose. The protection scope of the present invention should not be regarded as limited to the specific form stated in the present embodiment, and the protection scope of the present invention also extends to the equivalent technical means that those of ordinary skill in the art can think of according to the concept of the present invention.

Claims (3)

1. A no pump cooling device based on thermomagnetic effect which characterized in that: the device comprises a PC pipe, a copper-aluminum composite fin radiator, a red copper block, a permanent magnet, a fan and a nano fluid, wherein a liquid injection hole sealed by a rubber plug is arranged above the red copper block, a porous nano metal layer is arranged inside the red copper block, and the bottom of the red copper block is tightly combined with an electronic chip through a buckle; the inner cavity of the PC tube is communicated with the inner cavity of the red copper block, and the nano fluid in the inner cavity is used as a heat-conducting medium; the permanent magnet is sleeved on the fluid pipeline, and the inner cavity is not contacted with the fluid pipeline but supported by the silicone rubber gasket; the nanometer fluid flows through the copper-aluminum composite fin radiator, and the copper-aluminum composite fin radiator is positioned in the air outlet direction of the fan.

2. The thermo-magnetic effect based pumpless cooling device of claim 1, wherein: the red copper block is a cuboid with an inner hole, and the permanent magnet is cylindrical with the hole.

3. A pumpless cooling device based on thermomagnetic effect as claimed in claim 1 or 2, characterized in that: the interior of the red copper block is a porous nano metal layer, the inner cavity of the red copper block is a sudden expansion pipeline, the inner diameter of the pipeline for the PC pipe to enter the red copper block is smaller, and the inner diameter of the red copper block is larger, so that the convection heat exchange of the nanofluid is enhanced.

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