CN214228725U

CN214228725U - Steam cavity radiator based on relieving technology

Info

Publication number: CN214228725U
Application number: CN202022943284.1U
Authority: CN
Inventors: 王军; 段勇军; 相喆; 袁超
Original assignee: Nanjing 6902 Technology Co ltd
Current assignee: Nanjing 6902 Technology Co ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-09-17
Anticipated expiration: 2030-12-11

Abstract

The utility model discloses a steam chamber radiator based on forming relieved tooth technology, including heat dissipation tooth and heat dissipation base plate, heat dissipation base plate and heat dissipation tooth are integrated into one piece structure, and heat dissipation tooth parallel arrangement is at heat dissipation base plate upper surface, the heat dissipation base plate is hollow steam chamber structure, steam chamber internal seal has phase change medium, steam chamber internal surface sintering has the porous medium bottom. The heat dissipation base plate and the heat dissipation teeth of the utility model are integrally formed in a shoveling mode, the heat dissipation effect is stable and the processing cost is low; in the shoveling range, the thickness of the radiating teeth can be thinner, the space between the teeth is smaller, the radiating area is increased, and the radiating efficiency is improved; the heat dissipation substrate adopts a hollow steam cavity structure and has extremely high heat diffusion capacity; through the cooperation mode of the heat conduction rib with the porous medium bottom layer, the capillary driving force of the reflux of the condensed liquid is improved, and further the heat transfer efficiency of the steam cavity is improved.

Description

Steam cavity radiator based on relieving technology

Technical Field

The utility model relates to a radiator field, in particular to steam chamber radiator based on forming relieved tooth technology.

Background

In the design of the existing high-performance electronic equipment and small-sized high-end mobile equipment, the power density and the heat effect caused by the power density become important factors for restricting the further miniaturization design of a high-power integrated circuit. The thermal effect caused by high power density forces designers to reserve design margins for conservative design, and the heat flow with uneven spatial distribution cannot be effectively diffused into the environment through a uniform passive cooling means, so that the system often adopts a redundant design, and the cost is increased. In some data center occasions, the heat dissipation cost accounts for more than 30% of the total electricity consumption cost, and the importance of the heat dissipation technology is highlighted increasingly.

As the thermal design power increases, the power density distribution of high performance chips becomes very non-uniform, especially for microprocessors, and even exceeds 300W/cm for local hot spot areas²Whereas the average power density of the chip is an order of magnitude lower. Once the hot spot temperature exceeds the safety temperature threshold, the dynamic thermal management engine is activated and the system is triggered to reduce the frequency, so that the running performance of the electronic equipment is directly influenced.

The development of the miniaturization design of electronic equipment enables the power density to show a linear increasing trend along with the reduction of the size factor, the performance of the existing radiator is greatly improved, but the existing radiator is limited by a machining process, so that the equipment is large in size, thick and sparse in radiating teeth, and in addition, the heat expansion capacity of a metal substrate is limited, so that the overall radiating performance is general, and the radiating requirement of the miniaturization design of the electronic equipment with high power density cannot be met.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: to the above problem, the utility model provides a steam chamber radiator based on forming relieved tooth technology of reliable and efficient utilizes integrated into one piece structure and steam chamber structure, increases the radiating efficiency, reduces the radiator size.

The technical scheme is as follows: a steam chamber radiator based on forming relieved tooth technology, including heat dissipation tooth and heat dissipation base plate, heat dissipation base plate and heat dissipation tooth are integrated into one piece structure, and the shaping mode adopts the relief process, and heat dissipation tooth parallel arrangement is at heat dissipation base plate upper surface, the heat dissipation base plate is hollow steam chamber structure, steam chamber internal seal has phase change medium, steam chamber internal surface sintering has porous medium bottom.

The steam cavity structure comprises an upper cover plate and a lower cover plate, a plurality of heat conducting ribs are arranged in parallel in the upper cover plate, the arrangement direction of the heat conducting ribs is perpendicular to the arrangement direction of the heat radiating teeth, the arrangement mode of the heat conducting ribs is not only favorable for heat flow to diffuse to the edge heat radiating teeth, and the heat radiating efficiency is improved, but also favorable for avoiding the upper cover plate from generating axial buckling deformation in the shoveling process, and the steam cavity structure plays a role of reinforcing ribs; the distance between the heat conducting ribs is 2.5 times of the width of the heat conducting ribs.

One side of the heat conducting rib is of a semicircular structure, and the porous medium bottom layer is arranged on the outer circumferential surface of the semicircular structure.

The upper surface of the lower cover plate is sintered with a porous medium bottom layer, and the porous medium bottom layer of the lower cover plate is in contact with the semi-circular arc structure zero-cut angle of the heat conducting ribs.

The porous medium bottom layer is formed by sintering copper powder particles, the particles are one or a mixture of more of spherical, flaky and acicular, and the particle size is 0.05-0.1 mm.

The radiator adopts red copper or aluminum, and the surface of the radiator is subjected to anodic oxidation blackening treatment.

The thickness of the heat dissipation teeth is not less than 0.2mm, and the distance between the heat dissipation teeth is not less than 0.5 mm.

The packaging form of the heat radiator comprises: and packaging the lower cover plate and the upper cover plate sintered with the porous medium bottom layer to form a hollow steam cavity, then injecting a phase change medium into the steam cavity through the injection filling port, press-welding the injection filling port, and finally scraping the heat dissipation teeth.

Has the advantages that: compared with the prior art, the utility model, it is showing the advantage and is:

1. the heat dissipation base plate and the heat dissipation teeth of the utility model are integrally formed by adopting a scraping mode, so that thermal contact resistance can not be generated, the heat conduction efficiency reaches 100 percent of the raw material, the heat dissipation effect is stable and the processing cost is low; in the shoveling range, the thickness of the radiating teeth can be thinner, the space between the teeth is smaller, the radiating area is increased, and the radiating efficiency is improved;

2. the heat dissipation substrate adopts a hollow steam cavity structure, has extremely high heat diffusion capacity, is combined with the high-density relieving teeth, improves the heat dissipation efficiency, can reduce the overall size of the heat sink under the same heat consumption condition, and meets the high-power heat dissipation requirement of a narrow space;

3. the porous medium bottom layer formed by sintering copper powder particles has high permeability, and the capillary driving force of the backflow of condensed liquid is improved by the matching mode of the heat conduction ribs of the sintered porous medium bottom layer and the porous medium bottom layer, so that the separation of the porous medium bottom layer and a vapor-liquid phase is facilitated, the interface friction force generated by high-speed convection of a vapor-liquid interface is reduced, the flow resistance of vapor is reduced, and the heat transfer efficiency of a vapor cavity is further improved.

Drawings

FIG. 1 is a cross-sectional view of a vapor chamber heat sink;

FIG. 2 is an enlarged cross-sectional view of the vapor chamber structure;

FIG. 3 is a schematic view of a steam chamber radiator;

fig. 4 is an assembled perspective view of the vapor chamber heat sink.

Detailed Description

As shown in fig. 1, this embodiment steam chamber radiator based on relieving technology, including heat dissipation base plate 20 and heat dissipation tooth 10, heat dissipation base plate 20 adopts relieving technology integrated into one piece with heat dissipation tooth 10, heat dissipation base plate 20 is the middle part sealed steam chamber structure that has the phase change medium, steam chamber structure includes upper cover plate 21 and lower apron 22, wherein the inside of upper cover plate 21 is equipped with a plurality of heat conduction muscle 23 side by side, heat conduction muscle 23 direction of arrangement is perpendicular with heat dissipation tooth 10 direction of arrangement, heat conduction muscle 23 arrangement mode not only is favorable to the heat flow to marginal heat dissipation tooth 10 diffusion, promote the radiating efficiency, also be favorable to avoiding upper cover plate 21 to take place axial buckling deformation at the relieving in-process, play the strengthening rib effect. By adopting the mode of combining the steam cavity with the relieving process, the heat expansion performance of the heat dissipation substrate 20 is improved, the thermal contact resistance between the heat dissipation teeth 10 and the heat dissipation substrate 20 is eliminated, and the thinner and denser heat dissipation teeth 10 provide enough heat dissipation area, so that the overall heat dissipation effect of the heat radiator is comprehensively improved to a certain extent.

As shown in fig. 2, one side of the heat conducting rib 23 is a semi-circular arc structure 231, and a porous medium bottom layer 24 is sintered on the outer circumferential surface. A porous medium bottom layer 24 is also sintered on the inner wall surface of the lower cover plate 22 of the steam cavity, the porous medium bottom layer 24 is in zero-tangential-angle contact with the semi-arc structure 231, a sharp-angle area is formed between the semi-arc structure 231 and the porous medium bottom layer 24, sufficient backflow capillary driving force is provided for liquid phase medium in a limited space, a smooth steam channel is also provided for phase change medium by the space formed between the parallel heat conducting ribs 23, the steam-liquid two-phase separation is realized, and the thermal performance of the steam cavity structure is improved.

As shown in fig. 3, the manufacturing process of the steam cavity radiator based on the relieved tooth process is as follows: firstly, welding and sealing the lower cover plate 22 sintered with the porous medium bottom layer 24 and the upper cover plate 21, then injecting a phase change medium into the encapsulated hollow steam cavity through the filling port 30, press-welding the filling port 30, and finally, utilizing the scraper knife 100 to scrape the uniform heat dissipation teeth 10.

As shown in fig. 4, a plurality of mounting holes 25 are uniformly formed at four peripheral corners of the heat sink, no heat dissipation teeth 10 are disposed in the arrangement region of the mounting holes 25, the heat sink is fixed by bolts 40 and is tightly attached to the upper surface of the heating element 50, and a heat conduction pad is filled between the lower cover plate 22 of the heat sink and the upper surface of the heating element 50 or a heat conduction grease is coated thereon.

In some air cooling occasions, the thickness of the shovel teeth can be as thin as 0.2mm, and the tooth space is 2-3 times of the thickness; under certain natural heat dissipation conditions, the ratio of tooth space to tooth height is 1: 9.

Claims

1. the utility model provides a steam chamber radiator based on relieving technology, its characterized in that, includes heat dissipation tooth (10) and heat dissipation base plate (20), heat dissipation base plate (20) and heat dissipation tooth (10) are integrated into one piece structure, and heat dissipation tooth (10) parallel arrangement is at heat dissipation base plate (20) upper surface, heat dissipation base plate (20) are hollow steam chamber structure, steam chamber internal seal has the phase change medium, steam chamber internal surface sintering has porous medium bottom (24).

2. The steam cavity radiator based on the relieved tooth process as claimed in claim 1, wherein the steam cavity structure comprises an upper cover plate (21) and a lower cover plate (22), a plurality of heat conducting ribs (23) are arranged in parallel in the upper cover plate (21), and the arrangement direction of the heat conducting ribs (23) is perpendicular to the arrangement direction of the heat dissipation teeth (10).

3. The steam cavity radiator based on the relieved tooth process as claimed in claim 2, wherein one side of the heat conducting rib (23) is a semi-arc structure (231), and the porous medium bottom layer (24) is arranged on the outer circumferential surface of the semi-arc structure (231).

4. The steam cavity radiator based on the relieved tooth process as claimed in claim 2, wherein a porous medium bottom layer (24) is sintered on the upper surface of the lower cover plate (22), and the porous medium bottom layer (24) of the lower cover plate (22) is in zero-tangential-angle contact with the semi-circular arc structures (231) of the heat conducting ribs (23).

5. The steam cavity radiator based on the relieved tooth process as claimed in claim 1, wherein the forming manner adopts a relieved process.

6. The steam cavity radiator based on the relieved tooth process as claimed in claim 1, wherein the porous medium bottom layer (24) is formed by sintering copper powder particles, the particles are one or a mixture of spherical, flaky or needle-shaped, and the particle size is 0.05-0.1 mm.

7. The steam cavity radiator based on the relieved tooth process as claimed in claim 1, wherein the radiator is made of red copper or aluminum, and the surface of the radiator is subjected to anodic oxidation blackening treatment.

8. The steam chamber radiator based on a relieved tooth process as claimed in claim 1, wherein the thickness of the radiating teeth (10) is not less than 0.2mm, and the distance between the radiating teeth (10) is not less than 0.5 mm.