Trapezoidal manifold-microchannel cold plate with micro-pin-fin porous structure

Abstract

The invention discloses a trapezoidal manifold-microchannel cold plate with a micro-pin-fin porous structure, and belongs to the technical field of heat dissipation of electronic equipment. The device comprises an upper cover plate, a manifold layer, a micro-channel layer and a lower cover plate, the manifold layer comprises an inlet, an outlet, an inlet flow equalizing cavity, an outlet flow equalizing cavity, a manifold inlet channel and a manifold outlet channel, and the micro-channel layer comprises an acceleration section, a buffer section and a micro-pin-fin porous structure. Fluid is distributed to the manifold inlet channel through the flow equalizing cavity under the action of pump work, then enters the micro-channel layer through the manifold inlet channel and takes away heat transferred by the lower cover plate in the micro-channel, and the fluid absorbing heat enters the outlet flow equalizing cavity through the manifold outlet channel. And the manifold structure shortens the flow path, so that the flow is in a development stage, and heat exchange is enhanced while the flow resistance is reduced. The acceleration section of the micro-channel layer inhibits phase change backflow, and the acceleration section and the buffer section are formed by the micro-pin-fin porous structure, so that the formation of a vaporization core is accelerated, and the stability of two-phase boiling is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat dissipation of electronic equipment. Background Art

[0002] Cold plates, as efficient heat exchange devices, are widely used in electronic equipment cooling. As the heat flux density of electronic devices increases, microchannel cold plates, with their large surface area and high fluid heat transfer coefficient, are considered an effective solution for dissipating heat from high-heat-flux electronic devices. However, microchannel cold plates also suffer from high flow resistance, uneven flow distribution in internal parallel channels, reduced heat transfer efficiency along the flow path, and oscillations caused by phase changes within the microchannels. These factors increase the required pumping power, reduce temperature uniformity, and lead to unstable phase change flows, all of which reduce the cooling effectiveness of microchannel cold plates.

[0003] Invention patent CN202211044265.2 discloses a manifold microchannel heat exchanger with a diversion structure. This device addresses the thermal management issues of electronic equipment with high heat flux density, can significantly reduce the pump work required by the system, and enhance the heat dissipation capacity of high heat flux density surfaces. However, this invention cannot solve the problem of phase change instability within the microchannel. Invention patent CN202211068124.4 discloses a manifold microchannel radiator with low thermal resistance, low pump work, and good stability. This device significantly improves the wall temperature distribution perpendicular to the microchannel direction by arranging a flow-limiting channel under the manifold channel. However, this invention cannot ensure uniform distribution of fluid into the manifold inlet channel, and the short fluid flow will prevent nucleate boiling from occurring, reducing heat exchange efficiency. Summary of the Invention

[0004] In order to solve the problems of large flow resistance of microchannel cold plates, uneven flow distribution in internal parallel flow channels, reduced heat exchange efficiency along the process, phase change oscillation, etc., the present invention proposes a trapezoidal manifold-microchannel cold plate with a micro-needle rib porous structure. By combining the manifold with the microchannel cold plate with a micro-needle rib porous structure, the flow resistance is reduced, the heat exchange efficiency is enhanced, and the flow stability is improved.

[0005] In order to achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0006] A trapezoidal manifold-microchannel cold plate with a micro-needle rib porous structure includes an upper cover plate 1, a manifold layer 2, a microchannel layer 3, and a lower cover plate 4; the manifold layer 2 includes an inlet 201, an outlet 202, an inlet flow balancing cavity 203, an outlet flow balancing cavity 204, a manifold inlet channel 205, and a manifold outlet channel 206; the microchannel layer 3 includes an acceleration section 301, a buffer section 302, and a micro-needle rib porous structure 303; the manifold inlet channel 205 is composed of a plurality of parallel channels of regular size; the manifold outlet channel 206 is composed of a plurality of parallel The microchannel layer 3 is composed of channels of regular size; the manifold inlet channel 205 and the manifold outlet channel 206 are spaced apart; the inlet equalizing flow cavity 203 is connected to the manifold inlet channel 205; the outlet equalizing flow cavity 204 is connected to the manifold outlet channel 206; the manifold inlet channel 205 is perpendicular to the acceleration section 301 and the buffer section 302 of the microchannel layer 3; the manifold outlet channel 206 is perpendicular to the acceleration section 301 and the buffer section 302 of the microchannel layer 3; the microneedle rib porous structure 303 forms the solid wall surface of the acceleration section 301 and the buffer section 302.

[0007] Furthermore, the manifold layer 2 is located above the microchannel layer 3 , and the manifold inlet channel 205 and the manifold outlet channel 206 are connected through the microchannel layer 3 .

[0008] Furthermore, the inlet flow balancing chamber 203 and the outlet flow balancing chamber 204 are trapezoidal structures.

[0009] Furthermore, the acceleration section 301 is located below the manifold inlet channel 205 , and the buffer section 302 is located below the manifold outlet channel 206 .

[0010] Furthermore, the fluid inside the manifold layer 2 and the microchannel layer 3 is a single-phase working medium such as water, coolant, or a two-phase working medium such as Freon.

[0011] Compared with the prior art, the present invention has the following significant advantages:

[0012] (1) The trapezoidal manifold-microchannel cold plate with a micro-needle rib porous structure of the present invention shortens the fluid flow path and reduces the flow resistance inside the microchannel by combining the manifold and the microchannel cold plate.

[0013] (2) The trapezoidal manifold-microchannel cold plate with a micro-needle rib porous structure of the present invention forms a microchannel solid wall through a micro-needle rib porous structure array, which helps to accelerate the formation of the vaporization core, strengthen the heat exchange of the cold plate, and improve the stability of phase change boiling.

[0014] (3) The trapezoidal manifold-microchannel cold plate with a micro-needle rib porous structure of the present invention suppresses the fluid backflow caused by phase change oscillation through the acceleration section and buffer section inside the microchannel, thereby improving the flow stability.

[0015] (4) The trapezoidal manifold-microchannel cold plate with a micro-needle rib porous structure of the present invention evenly distributes the flow to each manifold inlet channel through the inlet equalizing flow cavity and the outlet equalizing flow cavity, thereby improving the temperature uniformity of the cold plate.

[0016] The present invention is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of an embodiment of the present invention after removing the upper cover plate.

[0019] Figure 3 2 is a cross-sectional view of the manifold layer of an embodiment of the present invention.

[0020] Figure 4 It is a cross-sectional view of the microchannel layer of an embodiment of the present invention.

[0021] Figure 5 It is a longitudinal sectional view of an embodiment of the present invention.

[0022] Figure 6 It is a transverse cross-sectional view of an embodiment of the present invention.

[0023] Among them, 1. upper cover plate; 2. manifold layer; 3. microchannel layer; 4. lower cover plate; 201. inlet; 202. outlet; 203. inlet uniform flow chamber; 204. outlet uniform flow chamber; 205. manifold inlet channel; 206. manifold outlet channel; 301. acceleration section; 302. buffer section; 303. microneedle rib porous structure. DETAILED DESCRIPTION

[0024] In order to illustrate the technical solution and technical purpose of the present invention, the present invention is further introduced below with reference to the accompanying drawings and specific embodiments.

[0025] Combine Figures 1 to 6The preferred embodiment of the present invention comprises an upper cover plate 1, a manifold layer 2, a microchannel layer 3, and a lower cover plate 4; the manifold layer 2 comprises an inlet 201, an outlet 202, an inlet flow balancing chamber 203, an outlet flow balancing chamber 204, a manifold inlet channel 205, and a manifold outlet channel 206; the microchannel layer 3 comprises an acceleration section 301, a buffer section 302, and a micro-needle rib porous structure 303; the manifold inlet channel 205 is composed of a plurality of parallel regular-sized channels; the manifold outlet channel 206 is composed of a plurality of parallel regular-sized channels. The manifold inlet channel 205 and the manifold outlet channel 206 are distributed at intervals; the inlet equalizing flow cavity 203 is connected to the manifold inlet channel 205; the outlet equalizing flow cavity 204 is connected to the manifold outlet channel 206; the manifold inlet channel 205 is perpendicular to the acceleration section 301 and the buffer section 302 of the microchannel layer 3; the manifold outlet channel 206 is perpendicular to the acceleration section 301 and the buffer section 302 of the microchannel layer 3; the microneedle rib porous structure 303 forms the solid wall surface of the acceleration section 301 and the buffer section 302.

[0026] The manifold layer 2 is located above the microchannel layer 3 , and the manifold inlet channel 205 and the manifold outlet channel 206 are connected through the microchannel layer 3 .

[0027] The inlet flow balancing chamber 203 and the outlet flow balancing chamber 204 are trapezoidal in structure.

[0028] The acceleration section 301 is located below the manifold inlet channel 205 , and the buffer section 302 is located below the manifold outlet channel 206 .

[0029] The fluid inside the manifold layer 2 and the microchannel layer 3 is a single-phase working medium such as water, coolant, or a two-phase working medium such as Freon.

[0030] In some embodiments, the microneedle rib porous structure 303 is cylindrical.

[0031] The cold plate has a length of 20-100 mm, a width of 20-100 mm, and a thickness of 4-15 mm. The upper cover plate has a thickness of 1-3 mm, the lower cover plate has a thickness of 1-3 mm, the microchannel layer has a thickness of 1-4 mm, the manifold layer has a thickness of 1-12 mm, the manifold inlet channel has a width of 2-10 mm, the manifold outlet channel has a width of 2-10 mm, the microneedle rib porous structure has a length of 1-100 μm, the microneedle rib porous structure has a width of 1-100 μm, and the spacing between the microneedle rib porous structures is 1-100 μm.

[0032] The working process of the trapezoidal manifold-microchannel cold plate with a micro-needle rib porous structure of the present invention is as follows:

[0033] The cold plate's lower cover is bonded to the heat source, transferring heat through the lower cover to the internal working medium. Fluid enters the inlet flow balancing chamber through the inlet, where it is evenly distributed to each manifold inlet channel. The fluid then enters the microchannel layer through the manifold inlet channels. The fluid absorbs heat in the acceleration section, buffer section, and micro-needle fin porous structure array. After flowing through an acceleration section and buffer section, the fluid enters the manifold outlet channel, where it converges into the outlet flow balancing chamber and exits the cold plate. This flow and heat exchange process reduces flow resistance, enhances the cold plate's heat exchange efficiency, and improves flow stability.

Claims

1. A trapezoidal manifold-microchannel cold plate with a micro-needle fin porous structure, characterized in that: The invention comprises an upper cover plate (1), a manifold layer (2), a microchannel layer (3), and a lower cover plate (4); the manifold layer (2) comprises an inlet (201), an outlet (202), an inlet flow balancing chamber (203), an outlet flow balancing chamber (204), a manifold inlet channel (205), and a manifold outlet channel (206); the microchannel layer (3) comprises an acceleration section (301), a buffer section (302), and a micro-needle rib porous structure (303); the manifold inlet channel (205) is composed of a plurality of parallel channels of conventional size; the manifold outlet channel (206) is composed of a plurality of parallel channels of conventional size; the manifold The tube inlet channel (205) and the manifold outlet channel (206) are distributed at intervals; the inlet flow balancing chamber (203) and the manifold inlet channel (205) are connected; the outlet flow balancing chamber (204) and the manifold outlet channel (206) are connected; the manifold inlet channel (205) is perpendicular to the acceleration section (301) and the buffer section (302) of the microchannel layer (3); the manifold outlet channel (206) is perpendicular to the acceleration section (301) and the buffer section (302) of the microchannel layer (3); and the micro-needle fin porous structure (303) forms the solid wall surface of the acceleration section (301) and the buffer section (302).

2. The trapezoidal manifold-microchannel cold plate with a micro-needle fin porous structure according to claim 1, characterized in that: The manifold layer (2) is located above the microchannel layer (3), and the manifold inlet channel (205) and the manifold outlet channel (206) are connected through the microchannel layer (3).

3. The trapezoidal manifold-microchannel cold plate with micro-needle fin porous structure according to claim 1, characterized in that: The inlet flow balancing chamber (203) and the outlet flow balancing chamber (204) are in a trapezoidal structure.

4. The trapezoidal manifold-microchannel cold plate with micro-needle fin porous structure according to claim 1, characterized in that: The acceleration section (301) is located below the manifold inlet channel (205), and the buffer section (302) is located below the manifold outlet channel (206).

5. The trapezoidal manifold-microchannel cold plate with micro-needle fin porous structure according to claim 1, characterized in that: The fluid inside the manifold layer (2) and the microchannel layer (3) is a single-phase working fluid, a cooling liquid or a two-phase working fluid.

Images