Connecting structure of heat pipe and aluminum radiating seat

Abstract

The utility model relates to a connecting structure of heat pipes and an aluminum radiating seat, which comprises a radiator and a plurality of heat pipes longitudinally welded on the radiating seat in parallel, the radiator comprises the aluminum radiating seat, a plurality of radiating fins which are vertical to the aluminum radiating seat and are integrally formed by aluminum extrusion are arranged on the lower surface of the aluminum radiating seat, and the radiating fins are arranged at certain intervals. A heat pipe groove used for positioning a heat pipe is formed in the upper surface of the aluminum heat dissipation base, copper powder particles are fixed to the heat pipe groove through high-speed impact jetting to form a copper face substrate, the heat pipe is embedded in the heat pipe groove, and a gap between the heat pipe and the heat pipe groove is filled with first welding flux.

Description

Technical Field

[0001] The utility model relates to the technical field of radiator processing, and particularly to a connection structure between a heat pipe and an aluminum heat sink base. Background Art

[0002] With the continuous development of electronic products, the heat generated by the internal chips is also increasing. Traditional heat dissipation methods have been difficult to meet the requirements. Heat pipe technology has been widely used in radiator design due to its extremely high thermal conductivity, good isothermal property, and ability to transfer heat over long distances. Therefore, the connection process between the radiator and the heat pipe has become particularly important, directly affecting the heat dissipation efficiency and overall performance of the radiator.

[0003] In the prior art, generally, the heat pipe is connected and installed on the radiator through two processes: "nickel plating + soldering" or "pipe pressing + epoxy resin filling". However, when using the "nickel plating + soldering" process, the whole or part of the product needs to be electroplated, which increases the production cost of the product and the corresponding process steps. After the product is made by the "pipe pressing + epoxy resin filling" process, since the heat resistance of epoxy resin is 180°C, with the continuous development of electronic products, the heat generated by the internal chips is also increasing. Only 180°C heat resistance may not be able to meet the heat resistance requirements of high-performance products. Content of the Utility Model

[0004] To solve the above problems, the utility model provides a connection structure between a heat pipe and an aluminum heat sink base.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows: The utility model relates to a connection structure between a heat pipe and an aluminum heat sink base, including a radiator and several heat pipes longitudinally and parallelly welded on the heat sink base. The radiator includes an aluminum heat sink base. The lower surface of the aluminum heat sink base is provided with several heat dissipation fins that are perpendicular to it and integrally formed by aluminum extrusion, and the several heat dissipation fins maintain a certain distance. The upper surface of the aluminum heat sink base is provided with a heat pipe groove for positioning the heat pipe. Copper powder particles are fixed on the heat pipe groove by high-speed impact spraying to form a copper surface base. The heat pipe is embedded in the heat pipe groove, and the gap between the heat pipe and the heat pipe groove is filled with a first solder.

[0006] Preferably, the heat pipe groove is an arc-shaped groove.

[0007] Preferably, both sides of the aluminum heat sink base are of a stepped structure.

[0008] Preferably, the aluminum heat sink base is an aluminum alloy base body, the heat dissipation fins are aluminum alloy heat dissipation fins, and the heat pipe is a copper pipe.

[0009] Preferably, the first solder is solder paste.

[0010] Preferably, there are multiple heat pipes, and the number of the heat pipe grooves corresponds to the number of the heat pipes.

[0011] Preferably, the heat pipe includes a welding section, a heat dissipation section, and a connecting section for connecting the welding section and the heat dissipation section; the welding section is accommodated in the heat pipe groove, and the welding section is in close contact with the copper surface base.

[0012] Preferably, the multiple heat pipe grooves are arranged at intervals. The welding section is provided with a welding plane and a welding side. When the heat pipe is accommodated in the heat pipe groove, the welding plane is flush with the bottom of the heat pipe groove. First solder is provided on both sides of the heat pipe groove, and the welding sides are in close contact with the first solder to achieve seamless welding of the heat pipe and the heat pipe groove.

[0013] The beneficial effects of the present utility model are as follows: In the present utility model, a copper pipe is nested on the aluminum heat dissipation base as a heat dissipation pipeline, which can reduce corrosion by utilizing the material characteristics of copper. And since the thermal conductivity of copper is greater than that of aluminum, the heat dissipation effect of the radiator is further increased. A plurality of heat dissipation fins are arranged on the aluminum heat dissipation base to increase the contact area between the aluminum heat dissipation base and the air, making the heat dissipation effect better. By forming a copper surface base on the surface of the heat pipe groove welded to the copper pipe with copper powder particles, the copper pipe and the aluminum heat dissipation base are easily combined. By filling the gaps and bubbles between the copper pipe and the heat pipe groove with solder paste, the copper pipe and the aluminum heat dissipation base are combined into an integral structure. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the overall structure of the product of the present utility model.

[0015] Figure 2 is an exploded structure schematic diagram of the product of the present utility model.

[0016] Figure 3 is a schematic cross-sectional view of the product of the present utility model.

[0017] Figure 4 is the present utility model Figure 3 Enlarged view of part A in. [[ID=3ele]]

[0018] Figure 5 is a schematic diagram of the process steps of the present utility model.

[0019] Figure 6 is a graph of the performance test results of the product of the present utility model.

[0020] Reference Signs

[0021] 1. Aluminum heat dissipation base; 11. Heat pipe groove; 2. Heat dissipation fin; 3. Heat pipe. Detailed Embodiments

[0022] Please refer to Figures 1-6As shown in the figure, the present utility model relates to a connection structure between a heat pipe and an aluminum heat sink, including a heat pipe 3 and a radiator. The radiator includes an aluminum heat sink 1 and heat dissipation fins 2. The heat dissipation fins 2 are arranged on the aluminum heat sink 1. Among them, a heat pipe groove 11 for positioning the heat pipe 3 is opened on the upper surface of the aluminum heat sink 1. Copper powder particles are fixed on the heat pipe groove 11 by high-speed impact spraying, or nano-copper paste is coated on the surface of the heat pipe groove 11 to form a rough copper surface substrate. The heat pipe 3 is embedded in the heat pipe groove 11.

[0023] To manufacture the connection structure between the heat pipe and the aluminum heat sink using the connection structure between the heat pipe and the aluminum heat sink, the technological steps are as follows:

[0024] Step 1: Prepare an aluminum radiator. The aluminum radiator is made of a material with fast heat dissipation but slow heat conduction. A plurality of heat dissipation fins 2 arranged at equal intervals are integrally formed on the lower surface of the aluminum heat sink 1, and a heat pipe groove 11 for accommodating the heat pipe is prepared on the upper surface of the aluminum heat sink 1;

[0025] Step 2: Spray copper powder on the heat pipe groove: Copper powder particles are fixed on the heat pipe groove 11 by high-speed impact spraying, or nano-copper paste is coated on the surface of the heat pipe groove 11 to form a rough copper surface substrate;

[0026] Step 3: Press the heat pipe 3: Put the heat pipe 3 into the heat pipe groove 11 and press the heat pipe 3 to make the heat pipe 3 fit tightly with the copper powder and the heat pipe groove 11;

[0027] Step 4: Weld the heat pipe 3: Dot-apply the first solder between the heat pipe and the copper surface substrate. After heating, melt the first solder to bond and fix the heat pipe in the heat pipe groove, and a welding surface is formed between the heat pipe and the heat pipe groove; A better bonding force is generated between the rough copper surface substrate and the heat pipe, and the first solder has a better bonding force, so that the heat pipe 3 is welded and fixed in the heat pipe groove 11;

[0028] Step 5: Surface processing: Process the welded surface to smooth the heat pipe 3 and the welding surface;

[0029] Step 6: Testing: Test the product, test the performance and pulling force of the product, and check the cooperation between processes.

[0030] Furthermore, in this embodiment, the aluminum heat sink 1 is made of aluminum material, and the heat pipe 3 is made of a copper pipe.

[0031] Among them, the first solder is solder paste. The first solder fills the gaps and bubble holes between the heat pipe 3 and the heat pipe groove 11, so that the heat pipe 3 and the heat pipe groove 11 are tightly fitted without gaps.

[0032] In this solution, the heat pipe 3 is L-shaped or strip-shaped. When the heat pipe 3 is L-shaped, it includes a welding section, a heat dissipation section, and a connection section for connecting the welding section and the heat dissipation section; the welding section is accommodated in the heat pipe groove 11, and the welding section is in close contact with the copper surface. When the heat pipe 3 is strip-shaped, the surface of the heat pipe 3 flush with the upper surface of the aluminum radiator is the heat dissipation section, and the section of the heat pipe 3 joined to the copper surface is the welding section.

[0033] There are multiple heat pipes 3, and the number of the heat pipe grooves 11 corresponds to the number of the heat pipes 3. The multiple heat pipe grooves 11 are arranged at intervals. The welding section is provided with a welding plane and a welding side surface. When the heat pipe 3 is accommodated in the heat pipe groove 11, the welding plane is flush with the bottom of the heat pipe groove 11. First solder is provided on both sides of the heat pipe groove 11, and the welding side surfaces are in close contact with the first solder to achieve seamless welding between the heat pipe 3 and the heat pipe groove 11.

[0034] In this embodiment, the existing technologies of "nickel plating + soldering" and "pipe pressing + epoxy resin filling" are also adopted for production, and products are obtained by different production methods. After production, the performances of the products of the three welding processes are compared under the same parameter standard test.

[0035] In the performance test of the product, under the condition of using the same number of heating blocks, the parameters of the fan (specification, number, air pressure, air volume), the test power, and the test time, as Figure 6 shown. The performance detection results of the processed products show that the temperature at the same position of the "copper-aluminum combined welding" product of the present utility model is lower than that of the "nickel plating + soldering" product and the "pipe pressing + epoxy resin filling" product. Therefore, it can be concluded that the "copper-aluminum combined welding" process of the present utility model has no difference in performance from the "nickel plating + soldering" product and the "pipe pressing + epoxy resin filling" product under the same parameter standard performance test.

[0036] In the pull-out force test of the product, under the condition of using the same unified parameters such as the product size and weight of the three welding processes, the results of the pull-out force test are as follows: the pull-out force of the "nickel plating + soldering" product is 194 kgf, the pull-out force of the "pipe pressing + epoxy resin filling" product is 210 kgf, and the pull-out force of the "copper-aluminum combined welding" product is 211 kgf. There is no abnormality in the three welding process products after the pull-out force test. Therefore, it can be concluded that the "copper-aluminum combined welding" product of the present utility model has a higher pull-out force and can meet the requirements of existing products.

[0037] In the process matching degree test of the product, after cutting the products of the three welding processes at the matching position with the heat pipe 3, the heat pipe 3 and the heat pipe groove 11 of the three welding process products are closely matched without gaps. Among them, in the "copper-aluminum combined welding" product of the present utility model, the gaps and air holes are filled with solder paste to make the heat pipe 3 and the heat pipe groove 11 closely matched without gaps.

[0038] In this embodiment, for products made by three different processes in three tests with the same parameter standards, it can be obtained that the product performance, pulling force, matching degree, and appearance after the connection structure of the heat pipe and the aluminum heat sink are no different from those of the existing two processes of "nickel plating + soldering" and "pipe pressing + epoxy resin filling".

[0039] When comparing the connection structure of the heat pipe and the aluminum heat sink of the present utility model with the "nickel plating + soldering" process, for the connection structure of the heat pipe and the aluminum heat sink of the present utility model, only copper powder needs to be sprayed in the heat pipe groove 11, while the "nickel plating + soldering" process requires electroplating of the whole or part of the product. In comparison, the manufacturing cost of the present utility model is lower and the process is simpler.

[0040] When comparing the connection structure of the heat pipe and the aluminum heat sink of the present utility model with the "pipe pressing + epoxy resin filling" process, the advantage of the connection structure of the heat pipe and the aluminum heat sink of the present utility model lies in that the product can withstand high temperatures (the soldering temperature resistance is 240°C, and the epoxy resin temperature resistance is 180°C), which improves the high-temperature resistance of the product and further improves the performance of the product.

[0041] The above embodiments are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A connection structure between a heat pipe and an aluminum heat sink, comprising a radiator and a plurality of heat pipes longitudinally and parallelly welded to the heat sink, characterized in that: The radiator includes an aluminum heat sink base. A number of heat dissipation fins that are perpendicular to and integrally aluminum-extruded are provided on the lower surface of the aluminum heat sink base, and the number of heat dissipation fins maintains a certain spacing. A heat pipe groove for positioning a heat pipe is formed on the upper surface of the aluminum heat sink base. Copper powder particles are fixed on the heat pipe groove by high-speed impact spraying to form a copper surface base. A heat pipe is embedded inside the heat pipe groove, and a first solder is filled in the gap between the heat pipe and the heat pipe groove.

2. The connection structure between a heat pipe and an aluminum heat sink according to claim 1, characterized in that: The heat pipe groove is an arc-shaped groove.

3. The connection structure between a heat pipe and an aluminum heat sink according to claim 1, characterized in that: Both sides of the aluminum heat sink base are of a stepped structure.

4. The connection structure between a heat pipe and an aluminum heat sink according to claim 1, characterized in that: The aluminum heat sink base is an aluminum alloy base body, the heat dissipation fins are aluminum alloy heat dissipation fins, and the heat pipe is a copper pipe.

5. The connection structure between a heat pipe and an aluminum heat sink according to claim 1, characterized in that: The first solder is solder paste.

6. The connection structure between a heat pipe and an aluminum heat sink according to claim 1, characterized in that: There are multiple heat pipes, and the number of heat pipe grooves corresponds to the number of heat pipes.

7. The connection structure between a heat pipe and an aluminum heat sink according to claim 1, characterized in that: The heat pipe includes a welding section, a heat dissipation section, and a connection section for connecting the welding section and the heat dissipation section; the welding section is accommodated in the heat pipe groove, and the welding section is in close contact with the copper surface base.

8. The connection structure between a heat pipe and an aluminum heat sink according to claim 7, characterized in that: A plurality of the heat pipe grooves are arranged at intervals. The welding section is provided with a welding plane and a welding side surface. When the heat pipe is accommodated in the heat pipe groove, the welding plane is flush with the bottom of the heat pipe groove. First solder is provided on both sides of the heat pipe groove, and the welding side surfaces are in close contact with the first solder to achieve a seamless welding setting between the heat pipe and the heat pipe groove.

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