CN206531416U - Integrated die cavity phase-change heat sink - Google Patents

Abstract

The utility model provides an integrated cavity phase-change radiator, comprising: a fin condensation chamber, a substrate evaporation chamber, a vacuum filling port, a supporting rib and an evaporation micro-groove, and the fin condensation chamber is composed of multiple The substrate evaporation chamber is fixed on the bottom surface of the fin condensation chamber, a plurality of supporting ribs are grouped and fixed inside the fin condensation chamber, and the evaporation microchannels are arranged between the substrate evaporation chamber and the fin condensation chamber. On the combined evaporation surface, the vacuum filling port is installed on the side of the substrate evaporation chamber. In this integrated cavity phase change radiator, the heat sink base plate and fins are made into a hollow cavity, and the two are connected to form an overall cavity. The phase-change heat is carried out inside, and the heat is quickly transferred from the heat source to the fin wall by using the phase-change heat to dissipate heat, which improves the overall temperature uniformity of the radiator and greatly improves the overall heat transfer performance of the radiator.

Description

Integrated cavity phase change radiator

technical field

The utility model relates to the technical field of heat dissipation, in particular to an integrated cavity phase change radiator.

Background technique

The device commonly used in the field of electronic thermal management technology to increase the heat dissipation area is generally called a heat sink. The purpose of setting the heat sink is to quickly guide the heat generated by the concentrated heat source to a larger heat dissipation area for heat exchange, thereby achieving enhanced heat dissipation. Effectively reduce the heat source temperature purpose. This kind of heat sink is generally made of copper or aluminum with high thermal conductivity. Because copper is heavy and costly, unless it is used in special occasions, the heat sink material is mostly aluminum. Aluminum is light in weight, low in cost, and relatively thermally conductive Higher, so it has become an ideal material for heat sink production. Although the heat sink uses a material with a high thermal conductivity, when the heat sink is relatively large in size relative to the heat source, its own thermal resistance leads to an increased temperature gradient on the heat sink, that is, the temperature uniformity of the heat sink becomes very low. Poor, this will reduce the use efficiency of the heat sink area, so a large amount of metal materials are often used to meet the heat dissipation requirements of the heat source, and the heat dissipation is made very large, which causes waste of metal materials, and the equipment is very heavy and bloated , which increases the production cost and is unfavorable for product transportation applications.

In view of the above problems, the most commonly used method is to combine the metal heat sink with the phase change heat pipe technology. The phase change heat pipe has very outstanding low thermal resistance performance and good overall temperature uniformity. By embedding the heat pipe into the heat sink substrate and fins Among them, the overall temperature uniformity of the heat sink can be effectively improved, and the utilization efficiency of the heat sink can be improved. Although the combination of heat pipes and heat sinks can effectively improve the utilization efficiency of heat sinks, there are certain problems in the application of this structure: First, relatively small-sized heat sinks use heat pipes, which can improve the utilization efficiency of heat sinks, but the heat sink The number of welding interfaces with heat pipes increases, the welding process is complicated, the processing and manufacturing costs increase, and the economic benefits are not significantly increased; secondly, a heat sink with a relatively large size needs to use a large number of heat pipes to achieve its temperature uniformity, and the structure is complicated , the complexity of the processing technology rises linearly, and the threshold of use increases; in addition, because the heat pipe is a line structure, and the heat sink fin is a surface structure, even if a heat pipe is used, the contact thermal resistance between the heat pipe and the fin cannot be achieved. Avoid, the performance of the heat sink itself still cannot be improved to the best.

Utility model content

Aiming at the deficiencies of the prior art, the utility model proposes an integrated cavity phase change radiator, which can improve the overall utilization rate of the heat sink to the best and greatly improve the overall heat transfer performance of the heat sink.

In order to realize the above-mentioned technical solution, the utility model provides an integrated cavity phase-change radiator, including: a fin condensation chamber, a substrate evaporation chamber, a vacuum filling port, a support rib and an evaporation microchannel, the The fin condensation chamber is composed of multiple fins arranged in parallel. The substrate evaporation chamber is fixed on the bottom surface of the fin condensation chamber. Multiple support ribs are grouped and fixed inside the fin condensation chamber. Evaporation microchannels are arranged in the substrate evaporation chamber. On the evaporation surface combined with the fin condensation chamber, the vacuum filling port is installed on the side of the substrate evaporation chamber.

In the above technical solution, the fin condensation chamber and the substrate evaporation chamber are fixed to form a radiator cavity, and the interior of the radiator cavity is evacuated through the vacuum filling port, and the phase change working medium is filled at the same time, so that the radiator cavity The phase-change heat is carried out inside the cavity as a whole, and the heat is quickly transferred from the heat source through the base plate to the wall of the fin for heat dissipation by using the phase-change heat, which improves the overall temperature uniformity and improves the overall utilization of the heat sink to the best, which greatly improves the The overall heat transfer performance of the radiator. At the same time, by setting evaporation microchannels on the evaporation surface where the substrate evaporation chamber and the fin condensation chamber are combined, it is beneficial to expand the heat transfer area of the substrate, thereby enhancing the evaporation effect of the substrate evaporation chamber. Due to the vacuum in the fin condensation chamber during operation, the fins may be deformed under a large negative pressure. out of shape.

Preferably, the rib adopts a hollow structure, and a hollow cavity is provided inside the rib. The hollow structure of the fins can enlarge the heat dissipation area of the fins, thereby enhancing the heat dissipation efficiency of the phase change working medium in the fins.

Preferably, ribs are provided on the surface of the ribs to further ensure that the ribs will not be deformed due to negative pressure.

Preferably, the surface of the evaporation micro-channel is provided with grooves with concave-convex intervals, through which the heat transfer area of the substrate can be further enlarged and the evaporation rate of the phase change working fluid can be accelerated.

The beneficial effect of the integrated cavity phase change radiator provided by the utility model is that the integrated cavity phase change radiator makes the heat sink base plate and the ribs into a hollow cavity, and the two are connected to form a whole The cavity, the inside of the cavity is evacuated, filled with phase change working fluid, so that the whole interior of the radiator undergoes phase change heat, and the phase change heat is used to quickly transfer the heat from the heat source to the fin wall for heat dissipation. The integrated structure At the same time, it avoids the contact thermal resistance between the heat pipe finned structure heat pipe and the heat dissipation fins, improves the overall temperature uniformity of the radiator, improves the overall utilization rate of the heat sink to the best, and greatly improves the overall exchange rate of the radiator. thermal performance.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram I of the present utility model.

Fig. 2 is a schematic diagram II of the three-dimensional structure of the utility model.

Fig. 3 is a three-dimensional structure schematic diagram I of the ribs in the present invention.

Fig. 4 is a schematic diagram II of the three-dimensional structure of the ribs in the present invention.

In the figure: 1. Fin condensation chamber; 11. Fin; 12. Rib; 13. Hollow cavity; 2. Substrate evaporation chamber; 3. Vacuum filling port; 4. Support rib; 5. Evaporation microgroove road.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. All other embodiments obtained by ordinary persons in the art without creative efforts belong to the protection scope of the present utility model.

Embodiment: an integrated cavity phase change radiator.

Referring to Figures 1 to 4, an integrated cavity phase change radiator includes: a fin condensation chamber 1, a substrate evaporation chamber 2, a vacuum filling port 3, a support rib 4 and an evaporation microchannel 5 , the fin condensation chamber 1 is composed of a plurality of fins 11 arranged in parallel, the substrate evaporation chamber 2 is fixed on the bottom surface of the fin condensation chamber 1, and a plurality of support ribs 4 are grouped and fixed inside the fin condensation chamber 1, The evaporation micro channel 5 is arranged on the evaporation surface where the substrate evaporation chamber 2 and the fin condensation chamber 1 are combined, and the vacuum filling port 3 is installed on the side of the substrate evaporation chamber 2 .

The working principle of the utility model is: the fin condensation chamber 1 and the substrate evaporation chamber 2 are fixed and sealed to form a radiator cavity, and the interior of the radiator cavity is vacuumed through the vacuum filling port 3, and the phase change process is filled at the same time. Quality, so that the entire interior of the radiator cavity undergoes phase-change heat, and uses phase-change heat to quickly transfer heat from the heat source through the substrate evaporation chamber 2 to the wall surface of the fin 11 for heat dissipation, improving the overall temperature uniformity and the overall utilization of the heat sink Upgraded to the best, greatly improving the overall heat transfer performance of the radiator. At the same time, by setting the evaporation microchannel 5 on the evaporation surface where the substrate evaporation chamber 2 and the fin condensation chamber 1 are combined, it is beneficial to expand the heat transfer area of the substrate, thereby enhancing the evaporation effect of the substrate evaporation chamber 2 . Due to the vacuum in the fin condensation chamber 1 during the operation, the fins 11 may be deformed under a large negative pressure, so multiple sets of supporting ribs 4 are added in the fin condensation chamber 1 to ensure that the fins 11 are not Will be deformed by negative pressure.

Referring to FIG. 4 , the fin 11 adopts a hollow structure, and a hollow cavity 13 is provided inside the fin 11 . The hollow structure of the fins 11 can enlarge the heat dissipation area of the fins 11 , thereby enhancing the heat dissipation efficiency of the phase change working fluid in the fins 11 .

Referring to FIG. 3 , ribs 12 are provided on the surface of the ribs 11 to further ensure that the ribs 11 will not be deformed due to negative pressure.

Referring to FIG. 2 , the surface of the evaporation micro-channel 5 is provided with grooves with concave-convex intervals, through which the heat transfer area of the substrate can be further enlarged and the evaporation rate of the phase-change working fluid can be accelerated.

This integrated cavity phase change radiator adopts 3D printing technology to form the overall structure in one step, without any solder joints, good sealing, low cost, and high yield. Combined with the performance advantages of this radiator itself, its future application prospects broad.

The above description is only a preferred embodiment of the utility model, but the utility model should not be limited to the disclosed content of the embodiment and the accompanying drawings, so any equivalent or completed without departing from the disclosed spirit of the utility model Modifications all fall within the protection scope of the utility model.

Claims (4)

1. An integrated cavity phase change radiator, characterized in that it comprises: a fin condensation chamber (1), a substrate evaporation chamber (2), a vacuum filling port (3), a support rib (4) and an evaporation The micro channel (5), the fin condensation chamber (1) is composed of a plurality of fins (11) arranged in parallel, the substrate evaporation chamber (2) is fixed on the bottom surface of the fin condensation chamber (1), multiple The supporting ribs (4) are grouped and fixed inside the fin condensation chamber (1), and the evaporation micro-channels (5) are arranged on the evaporation surface where the base plate evaporation chamber (2) and the fin condensation chamber (1) are combined, and vacuumized The filling port (3) is installed on the side of the substrate evaporation chamber (2). 2. The integrated cavity phase change radiator according to claim 1, characterized in that: the fins (11) adopt a hollow structure, and a hollow cavity (13) is provided inside the fins (11). 3. The integrated cavity phase change heat sink according to claim 2, characterized in that: the surface of the fins (11) is provided with reinforcing ribs (12). 4. The integrated cavity phase change radiator according to claim 1, characterized in that: the surface of the evaporation micro-channel (5) is provided with grooves with concave and convex intervals.