Active immersion two-phase liquid cooling device for heat dissipation of high-heat-flux heating element

Abstract

The utility model relates to the field of immersion liquid cooling heat dissipation, in particular to an active immersion two-phase liquid cooling device for heat dissipation of a high-heat-flux heating element, which comprises an immersion cavity and a condensation cavity. The immersion cavity is filled with cooling liquid for carrying out phase-change heat exchange on the high-heat-flux heating element, and the two side walls of the immersion cavity are communicated with an inlet and an outlet of the cooling circulation loop respectively; the condensation cavity is located above the immersion cavity and communicated with the immersion cavity, a metal foam layer is arranged at the communication position of the condensation cavity and the immersion cavity, and the two side walls of the condensation cavity are communicated with an inlet and an outlet of the cooling circulation loop respectively. According to the utility model, the condensation rate is increased mainly through the direct contact of the gaseous cooling liquid and the liquid cooling liquid, and meanwhile, the flow dividing cavities are arranged on the two sides of the immersion cavity to increase the fluid disturbance near the heating element, so that the thermal boundary layer on the surface of the heating element is changed, and the boiling heat exchange effect is enhanced. The heat exchanger has the advantages of low cost, simplicity in maintenance, good heat exchange effect and the like.

Description

Technical Field

[0001] This utility model relates to the field of immersion liquid cooling, and in particular to an active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements. Background Technology

[0002] Immersion liquid cooling technology has advantages such as strong heat transfer capacity, good temperature uniformity, and energy saving, and has good application prospects in the field of heat dissipation for high heat flux density heating elements. Currently, the heat and mass transfer (coolant vapor and high-temperature coolant) in the two-phase liquid cooling process is inherently complex. Therefore, improving the heat transfer efficiency in active two-phase immersion liquid cooling driven by a power unit is a current research challenge. Utility Model Content

[0003] Based on the above problems, the purpose of this utility model is to provide an active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements. The technical solution adopted by this utility model is as follows:

[0004] This utility model proposes an active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements, comprising:

[0005] An immersion chamber is filled with a coolant that performs phase change heat transfer on a high heat flux density heating element. The two side walls of the immersion chamber are respectively connected to the inlet and outlet of a cooling circulation loop.

[0006] A condensing chamber is located above the immersion chamber and is connected to the immersion chamber. A metal foam layer is provided at the connection point between the condensing chamber and the immersion chamber. The two side walls of the condensing chamber are respectively connected to the inlet and outlet of the cooling circulation loop.

[0007] Preferably, the cooling circulation loop includes a circulation pipe, on which a condenser, a liquid storage tank, a circulation pump, and monitoring and metering elements are installed;

[0008] The outlet of the circulation pipe is provided with branch pipe one and branch pipe two. Branch pipe one is connected to the condensation chamber, and branch pipe two is connected to the immersion chamber.

[0009] The inlet of the circulation pipe is provided with branch pipe three and branch pipe four. Branch pipe three is connected to the condensation chamber, and branch pipe four is connected to the immersion chamber.

[0010] Preferably, each of the two side walls of the immersion chamber is provided with a communicating flow divider chamber, and the two flow divider chambers are respectively connected to the inlet and outlet of the cooling circulation loop; each of the two flow divider chambers is provided with a flow divider component.

[0011] Preferably, the diversion component is a perforated plate.

[0012] Preferably, the condensation chamber is provided with a flow equalization component.

[0013] Preferably, the flow equalization component is a perforated plate.

[0014] Preferably, the condensation chamber is equipped with a safety valve and a pressure gauge.

[0015] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0016] This invention proposes an active immersion two-phase liquid cooling device suitable for heat dissipation of high heat flux density heating elements. A condensation chamber is located in the upper part of the immersion chamber, allowing the vaporized coolant to directly contact the coolant at a lower temperature, thus facilitating faster vapor condensation and reflux. The inclusion of metal foam allows the fluid to be blocked by foam ligaments at different locations, resulting in a more uniform flow field. Furthermore, the pores of the metal foam break down larger air bubbles into smaller ones, enhancing the direct contact condensation effect. Flow dividers are located on both sides of the immersion chamber to increase fluid turbulence near the heating element, altering the thermal boundary layer on the heating element surface and thus enhancing boiling heat transfer. This invention offers advantages such as low cost, simple maintenance, and excellent heat exchange performance. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements according to this utility model.

[0019] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0020] Figure 3 for Figure 1 A cross-sectional view along the BB direction.

[0021] Explanation of reference numerals in the attached drawings: 1. Immersion chamber; 2. High heat flux density heating element; 3. Cooling circulation loop; 301. Circulation pipe; 302. Condenser; 303. Liquid storage tank; 304. Circulation pump; 305. Monitoring and metering element; 306. Branch pipe one; 307. Branch pipe two; 308. Branch pipe three; 309. Branch pipe four; 310. Control valve; 4. Condensation chamber; 401. Flow equalization component; 5. Metal foam layer; 6. Flow divider chamber; 601. Flow divider component; 7. Safety valve; 8. Pressure gauge; 9. Drain port; Detailed Implementation

[0022] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 As shown in the figure, this embodiment discloses an active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements, including an immersion chamber 1, a cooling circulation loop 3 and a condensation chamber 4.

[0024] The immersion chamber 1 is made of a pressure-resistant material such as metal, plastic, or quartz glass. The immersion chamber 1 is filled with a coolant that performs phase change heat transfer on the high heat flux density heating element 2. The two-phase coolant can be fluorinated liquid, mineral oil, or silicone oil, etc. The two side walls of the immersion chamber 1 are connected to the inlet and outlet of the cooling circulation loop 3, respectively.

[0025] The condensing chamber 4 is located above the immersion chamber 1 and is connected to the immersion chamber 1. A metal foam layer 5 is provided at the connection position between the condensing chamber 4 and the immersion chamber 1. The two side walls of the condensing chamber 4 are connected to the inlet and outlet of the cooling circulation loop 3, respectively.

[0026] The working principle of this invention is as follows: After the coolant in the immersion chamber 1 absorbs heat from the high heat flux density heating element 2, a portion of it turns into vapor and rises to the metal foam layer 5, where it comes into direct contact with the coolant flowing into the metal foam layer 5 in the condensation chamber 4, condensing into droplets. The condensed droplets eventually flow back into the immersion chamber 1. The coolant in the immersion chamber 1, after absorbing heat from the high heat flux density heating element 2, also turns into a higher-temperature liquid and flows into the cooling circulation loop 3. After being cooled by the circulation in the cooling circulation loop 3, it re-enters the condensation chamber 4 and the immersion chamber 1. Excess condensate in the condensation chamber 4 can flow back into the cooling circulation loop 3 through corresponding branch pipes.

[0027] This invention employs a condensation chamber 4 located above the immersion chamber 1, allowing the vaporized coolant to directly contact the coolant at a lower temperature, thus facilitating faster vapor condensation and reflux. The metal foam layer 5 allows the fluid to flow more uniformly as it is blocked by foam ligaments at different locations. Furthermore, the pores of the metal foam break down larger air bubbles into smaller ones, enhancing the direct contact condensation effect. The metal foam layer 5 can be made of metals with excellent heat transfer properties, such as copper or aluminum.

[0028] like Figure 2 As shown, in this embodiment, a flow equalization member 401 is provided in the condensation chamber 4, and the coolant entering the condensation chamber 4 is uniformly dispersed to the metal foam layer 5 through the flow equalization member 401. The flow equalization member 401 is specifically a perforated plate, and its holes can be circular, square, triangular, or other shapes.

[0029] In this embodiment, the cooling circulation loop 3 includes a circulation pipe 301, on which a condenser 302, a liquid storage tank 303, a circulation pump 304, a monitoring and metering element 305, and a control valve 310 are installed. The monitoring and metering element 305 can be a flow meter. The condenser 302 can be air-cooled or water-cooled.

[0030] The outlet of the circulation pipe 301 is provided with branch pipe 1 306 and branch pipe 2 307. Branch pipe 1 306 is connected to the condensation chamber 4, and branch pipe 2 307 is connected to the immersion chamber 1. The inlet of the circulation pipe 301 is provided with branch pipe 308 and branch pipe 4 309. Branch pipe 308 is connected to the condensation chamber 4, and branch pipe 4 309 is connected to the immersion chamber 1.

[0031] like Figure 1 and 3 As shown, in this embodiment, two interconnected flow-dividing cavities 6 are provided on both side walls of the immersion chamber 1. The two flow-dividing cavities 6 are respectively connected to the inlet and outlet of the cooling circulation loop 3, specifically, the two flow-dividing cavities 6 are connected to branch pipe two 307 and branch pipe four 309 respectively. Each of the two flow-dividing cavities 6 is provided with a flow-dividing component 601. The flow-dividing component 601 is specifically a perforated plate. The shape of the flow-dividing cavity 6 can be a cuboid or a cylinder.

[0032] The flow divider 6, connected to branch pipe 2 307, diverts the coolant in the circulation pipe 301 into the immersion chamber 1, thereby increasing the turbulence of the fluid near the high heat flux density heating element 2 and enhancing the heat transfer effect. The flow divider 6, connected to branch pipe 4 309, collects the mixed coolant in the immersion chamber 1 and returns it to the circulation pipe 301. The flow dividers 6 are located on both sides of the immersion chamber 1 to increase the fluid turbulence near the high heat flux density heating element 2, changing the thermal boundary layer on the surface of the heating element and thus enhancing the boiling heat transfer effect.

[0033] In this embodiment, a safety valve 7 and a pressure gauge 8 are provided on the condensation chamber 4, and a drain port 9 is provided at the bottom of the immersion chamber 1.

[0034] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements, characterized in that, include: Immersion chamber (1), which is filled with coolant that performs phase change heat transfer on high heat flux density heating element (2), and the two side walls of the immersion chamber (1) are respectively connected to the inlet and outlet of cooling circulation loop (3); A condensing chamber (4) is located above the immersion chamber (1) and is connected to the immersion chamber (1). A metal foam layer (5) is provided at the connection position between the condensing chamber (4) and the immersion chamber (1). The two side walls of the condensing chamber (4) are respectively connected to the inlet and outlet of the cooling circulation loop (3).

2. The active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements according to claim 1, characterized in that: The cooling circulation loop (3) includes a circulation pipe (301), on which a condenser (302), a liquid storage tank (303), a circulation pump (304), and a monitoring and metering element (305) are installed; The outlet of the circulation pipe (301) is provided with a branch pipe one (306) and a branch pipe two (307). The branch pipe one (306) is connected to the condensation chamber (4), and the branch pipe two (307) is connected to the immersion chamber (1). The inlet of the circulation pipe (301) is provided with branch pipe three (308) and branch pipe four (309). Branch pipe three (308) is connected to the condensation chamber (4), and branch pipe four (309) is connected to the immersion chamber (1).

3. The active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements according to claim 1, characterized in that: The two sides of the immersion chamber (1) are provided with a connecting flow divider (6), and the two flow dividers (6) are respectively connected to the inlet and outlet of the cooling circulation loop (3); the two flow dividers (6) are provided with a flow divider component (601).

4. The active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements according to claim 3, characterized in that: The diversion component (601) is a perforated plate.

5. The active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements according to claim 1, characterized in that: The condensation chamber (4) is provided with a flow equalization component (401).

6. The active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements according to claim 5, characterized in that: The flow equalization component (401) is a perforated plate.

7. The active immersion two-phase liquid cooling device for heat dissipation of high heat flux density heating elements according to claim 1, characterized in that: The condensation chamber (4) is equipped with a safety valve (7) and a pressure gauge (8).

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