Integrally-formed composite wick vapor chamber and manufacturing method

Abstract

The invention provides an integrally-formed composite wick vapor chamber and a manufacturing method. A cover plate and a bottom plate form a vapor chamber shell; a composite liquid absorbing core is arranged on the inner side of the bottom plate, the composite liquid absorbing core is composed of a first plane silk screen and a spiral woven mesh, a circular ring protrusion is arranged on the first plane, the protrusion replaces a traditional powder ring, and the first plane silk screen and a second plane silk screen are connected together; a second plane silk screen is arranged on the inner side of the cover plate and serves as a liquid absorbing core; the first plane silk screen and the second plane silk screen are connected into an integrated structure through the copper columns. The composite wick structure is integrally formed by adopting a mold, so that the traditional method of manually placing the powder ring is reduced, the labor force is greatly reduced, and the manufacturing process of the whole vapor chamber is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic heat dissipation, and in particular to an integrally formed composite liquid wick vapor chamber and a manufacturing method thereof. Background Art

[0002] With the rapid development of the Internet industry, the power of communication equipment chips has increased. When other communication equipment is in operation, the chips generate a large heat flux density, which causes the chip temperature to be too high, resulting in loss of frequency and overclocking.

[0003] Traditional heat sinks usually use a flat wire mesh structure or a flat wire mesh and copper powder sintered wick structure. The base plate and cover plate wick are connected by powder rings, which requires more manpower. Summary of the invention

[0004] In order to improve multiple technical problems, the present invention provides an integrated composite liquid wick vapor chamber and a manufacturing method. From the perspective of high-power chip heat dissipation, the integrated composite liquid wick vapor chamber has high thermal conductivity and low thermal resistance, and can transfer the heat of the chip to the heat dissipation fins in a short time and dissipate the heat, so that the high-power chip can meet the working range; in addition, it also provides

[0005] The present invention provides the following technical solutions:

[0006] An integrally formed composite liquid wick heat spreader comprises a cover plate and a bottom plate, wherein the cover plate and the bottom plate form a heat spreader shell; a composite liquid wick is arranged on the inner side of the bottom plate, and the composite liquid wick is composed of a first plane screen and a spiral woven screen; a second plane screen is arranged on the inner side of the cover plate, and the second plane screen serves as the liquid wick; the first plane screen is connected to the second plane screen through a copper column to form an integral structure.

[0007] The first plane screen has a circular protrusion, which replaces the traditional way of placing powder rings and greatly reduces human resources.

[0008] The copper column has the same inner diameter and height as the circular protrusion of the first plane screen. This design is to allow the liquid at the cover plate to flow back to the bottom plate through the plane screen, further improving the heat dissipation performance of the heat dissipation plate.

[0009] The spiral woven mesh has a dendrite structure at the evaporation end and the condensation end. The dendrite bifurcations are tangent to the annular protrusions of the first plane screen. This design greatly improves the liquid reflux capacity. The cross-sectional size of the spiral woven mesh is 0.26mm×2.6mm.

[0010] The first plane screen adopts a 200-mesh double-layer structure, the 200-mesh plane screen adopts a double-strand 0.05mm wire diameter, and the 100-mesh plane screen adopts a double-strand 0.1mm wire diameter.

[0011] The cross-sectional size of the spiral braided mesh is 0.26 mm×2.6 mm.

[0012] The second plane screen adopts a single-layer 100-mesh plane screen, and the 100-mesh plane screen adopts a double-strand 0.05 mm wire diameter.

[0013] The manufacturing method of the one-piece composite liquid wick soaking plate comprises the following steps:

[0014] Step 1, manufacturing at least four cover plates and base plates, a welding mesh mold, a riveting mold, and a diffusion welding graphite mold;

[0015] Step 2: Place the spiral woven mesh into a graphite mold with a strip groove depth of 1 mm for annealing to eliminate internal stress and finalize the shape;

[0016] Step 3: trim the spiral woven mesh into a tree-like structure at the evaporation end and the condensation end and place it in a welded mesh graphite mold with a strip groove depth of H, place a first flat wire mesh on the upper part of the spiral woven mesh, and sinter it into a composite liquid wick in an integrated manner;

[0017] Step 4: The bottom plate and the sintered composite liquid absorbent core are first subjected to a fixed mesh treatment, and then the copper column is placed in the first plane screen ring protrusion, the plane screen ring protrusion and the copper column are placed in the graphite cylindrical groove, and the spiral woven mesh is placed in the strip groove of the graphite mold. The bottom plate, the composite liquid absorbent core and the graphite module are placed in a resistance welding furnace for sintering treatment; at the same time, the cover plate and the second plane screen are sintered together after being fixed to form a liquid absorbent core;

[0018] Step 5, annealing the sintered composite absorbent core and the absorbent core and testing the water absorption of the absorbent core;

[0019] Step 6: After the sintered cover plate and base plate are placed in a riveting mold for integral molding, they are placed in a diffusion welding graphite mold for diffusion welding and welded into one body to form a heat spreader;

[0020] Step 7: Vacuum the heat plate, perform secondary degassing and weld the liquid injection pipe;

[0021] Step 8: Fill the heat spreader with liquid, trim, level, and perform surface treatment.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention provides a method for manufacturing an integrally formed composite liquid wick vapor chamber. The radiator and the heat dissipation system have the following advantages over the existing technology:

[0024] (1) The one-piece composite liquid wick heat spreader is a flat wire mesh composite spiral woven mesh design structure, in which the spiral woven mesh has a dendrite-like liquid wick structure at the evaporation end and the condensation end. This design is conducive to the rapid flow of liquid at the condensation end to the heat source at the evaporation end. Since the evaporation end is also a dendrite-like liquid wick structure, it is conducive to evenly dispersing the liquid at the entire evaporation end, thereby increasing the gas-liquid flow rate and further improving the heat transfer performance of the heat spreader.

[0025] (2) In the manufacturing method of the integrally formed composite liquid absorbent core heat spreader, the liquid absorbent core of the heat spreader is integrally formed. The integrally formed liquid absorbent core has a circular ring protrusion to replace the traditional method of placing a powder ring, which reduces the steps of placing the powder ring in the traditional way, greatly reduces labor, and improves the efficiency of heat spreader manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall exploded view of the heat sink of the embodiment provided by the present invention.

[0027] Figure 2 These are the steps for manufacturing the heat spreader of the embodiment provided by the present invention.

[0028] Figure 3 It is the three-dimensional structure of the spiral woven mesh of the embodiment provided by the present invention.

[0029] Figure 4 It is the three-dimensional structure of the plane screen of the embodiment provided by the present invention.

[0030] Figure 5 The embodiment provided by the present invention Figure 4 Partial view of location A.

[0031] Figure 6 It is a three-dimensional structure formed by the composite of a flat wire mesh and a spiral woven mesh in the embodiment provided by the present invention.

[0032] Figure 7 The invention discloses a mold for compositely forming a flat wire mesh and a spiral woven mesh according to an embodiment of the invention.

[0033] Figure 8 The invention discloses a heat spreader riveting die according to an embodiment of the present invention.

[0034] The following are marked in the figure:

[0035] 101 bottom plate, 102 first plane wire mesh, 103 spiral woven mesh, 104 copper column, 105 second plane wire mesh, 106 cover plate, 201 circular ring protrusion, 301 graphite mold cylindrical groove, 302 graphite mold strip groove. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the embodiments and drawings, but it should be understood that the embodiments and drawings are only used to exemplify the present invention and do not constitute any limitation on the protection scope of the present invention. All reasonable changes and combinations within the scope of the inventive concept of the present invention fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "set", "install", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] Embodiment 1

[0040] like Figure 1 As shown, the present invention provides an integrally formed composite liquid absorbent core heat spreader, which mainly includes a cover plate 106 and a bottom plate 101, and the cover plate 106 and the bottom plate 101 form a heat spreader shell; a composite liquid absorbent core is provided on the inner side of the bottom plate 101, and the composite liquid absorbent core is composed of a first plane screen 102 and a spiral woven screen 103; a second plane screen 105 is provided on the inner side of the cover plate 106, and the second plane screen 105 serves as the liquid absorbent core; the composite liquid absorbent core contacted by the bottom plate 101 is a composite structure composed of the first plane screen 102 and the spiral woven screen 103, and the first plane screen 102 is formed by The copper column 104 is connected to the second plane screen 105 as an integral structure, and the spiral woven mesh 103 is a dendrite structure at the evaporation end and the condensation end. The spiral woven mesh 103 can provide a greater capillary force than the plane screen. The dendrite-like spiral woven mesh 103 at the evaporation end and the condensation end can well return the liquid at the condensation end to the heat source at the evaporation end, thereby improving and accelerating the efficiency of the gas-liquid circulation of the liquid wick, so that the entire heat spreader has a better heat spreader performance; the liquid wick contacted by the cover plate 106 has only one layer of the second plane screen 105 liquid wick structure.

[0041] like Figure 4 and Figure 5 As shown, the first plane screen 102 in contact with the bottom plate 101 has a circular protrusion, which replaces the traditional way of placing powder rings and greatly reduces human resources.

[0042] like Figure 3 As shown, a spiral woven mesh 103 is arranged above the first plane screen 102 in contact with the bottom plate 101, and a dendrite structure is arranged at the evaporation end and the condensation end thereof, and the dendrite bifurcation is tangent to the circular protrusion of the first plane screen, and the cross-sectional size of the spiral woven mesh 103 is 0.26 mm×2.6 mm.

[0043] like Figure 6 As shown, at the condensation end, the spiral woven mesh 103 is tangent to the annular protrusion of the first plane screen 102. This design greatly improves the liquid reflux capacity. An array of copper pillars 104 are arranged inside the heat spreader as support pillars. The copper pillars 104 have the same inner diameter and height as the annular protrusion of the first plane screen 102. This design is to allow the liquid at the cover plate 106 to flow back to the bottom plate 101 through the second plane screen 105 and the first plane screen 102, further improving the heat spreader performance.

[0044] The first plane screen 102 adopts a 200-mesh double-layer structure. The 200-mesh plane screen adopts a double-strand 0.05mm wire diameter, and the 100-mesh plane screen adopts a double-strand 0.1mm wire diameter. The double-layer aperture forms a V-shape, which is helpful for the bubble to detach and improves the temperature uniformity of the entire heat spreader. The second plane screen 105 adopts a single-layer 100-mesh liquid absorbent core; this design improves the reflux capacity of the entire liquid absorbent core, and also increases the gas channel, which is conducive to better gas flow, further improving the temperature uniformity of the entire heat spreader.

[0045] Embodiment 2

[0046] like Figure 2 As shown, the present invention also provides a method for manufacturing an integrally formed composite liquid wick vapor chamber, the steps comprising:

[0047] Step 1: manufacture at least four cover plates 106 and base plates 101, such as Figure 7 The welding mesh mold shown in Figure 8 The riveting die shown;

[0048] Step 2: Place the spiral woven mesh 103 into a graphite mold with a strip groove depth of 1 mm for annealing to eliminate internal stress and finalize the shape;

[0049] Step 3: trim the spiral woven mesh 103 into a dendrite structure at the evaporation end and the condensation end and place it in a welded mesh graphite mold with a strip groove depth of H, place the first flat wire mesh 102 on the upper part of the spiral woven mesh 103, and sinter it into a composite liquid wick in an integrated manner;

[0050] Step 4: The bottom plate 101 and the sintered composite liquid absorbent core are first subjected to a fixed mesh treatment, and then the copper column 104 is placed in the first plane screen ring protrusion 201, the plane screen ring protrusion and the copper column are placed in the graphite cylindrical groove 301, and the spiral woven mesh is placed in the graphite mold strip groove 302. The bottom plate 201, the composite liquid absorbent core and the graphite module are placed in a resistance welding furnace for sintering treatment; at the same time, the cover plate 106 and the second plane screen 105 are sintered together after being fixed to form a liquid absorbent core;

[0051] Step 5, annealing the sintered composite absorbent core and the absorbent core and testing the water absorption of the absorbent core;

[0052] Step 6: After the sintered cover plate 106 and base plate 101 are placed in a riveting mold for integral molding, they are placed in a diffusion welding graphite mold for diffusion welding and welded into one body to form a heat spreader;

[0053] Step 7: Vacuum the heat plate, perform secondary degassing and weld the liquid injection pipe;

[0054] Step 8: Perform post-processing such as liquid injection, edge trimming, leveling, and surface treatment on the heat spreader.

[0055] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An integrally formed composite liquid wick soaking plate, characterized in that: The invention comprises a cover plate (106) and a bottom plate (101), wherein the cover plate (106) and the bottom plate (101) form a heat soaking plate shell; a composite liquid wick is arranged on the inner side of the bottom plate (101), and the composite liquid wick is composed of a first plane screen (102) and a spiral woven screen (103); a second plane screen (105) is arranged on the inner side of the cover plate (106), and the second plane screen (105) serves as the liquid wick; and the first plane screen (102) is connected to the second plane screen (105) through a copper column (104) to form an integrated structure.

2. The one-piece composite liquid wick vapor chamber according to claim 1, characterized in that: The first planar screen (102) has a circular protrusion.

3. The one-piece composite liquid wick soaking plate according to claim 2, characterized in that: The copper column (104) has the same inner diameter and height as the annular protrusion of the first planar screen (102).

4. The one-piece composite liquid wick vapor chamber according to claim 2, characterized in that: The spiral woven mesh (103) is a dendrite-like structure at the evaporation end and the condensation end, and the dendrite-like bifurcations are tangent to the annular protrusions of the first planar wire mesh (102).

5. The one-piece composite liquid wick vapor chamber according to claim 1, characterized in that: The spiral woven mesh (103) is a dendrite-like structure at the evaporation end and the condensation end.

6. The one-piece composite liquid wick vapor chamber according to claim 1, characterized in that: The first planar screen (102) adopts a 200-mesh double-layer structure, and the 200-mesh planar screen adopts a double-strand 0.05 mm wire diameter.

7. The one-piece composite liquid wick vapor chamber according to claim 1, characterized in that: The second flat screen (105) is a single-layer 100-mesh flat screen.

8. The integrally formed composite liquid wick vapor chamber according to claim 1, characterized in that: The cross-sectional size of the spiral braided mesh is 0.26 mm×2.6 mm.

9. The method for manufacturing the integrally formed composite liquid wick vapor chamber according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1, manufacturing a cover plate (106), a base plate (101), a welding mesh mold, a riveting mold, and a diffusion welding graphite mold; Step 2: placing the spiral woven mesh (103) into a graphite mold with a strip groove depth of 1 mm for annealing to eliminate internal stress and finalize the shape; Step 3, trimming the spiral woven mesh (103) into a dendrite structure at the evaporation end and the condensation end and placing it in a welded mesh graphite mold with a strip groove depth of 0.22 mm, placing a first flat wire mesh (102) on the upper part of the spiral woven mesh (103), and sintering it into a composite liquid wick in an integrated manner; Step 4: The bottom plate (101) and the sintered composite liquid absorbent core are first subjected to a meshing process, and then the copper column (104) is placed in the first plane screen ring protrusion (201), the plane screen ring protrusion and the copper column are placed in the graphite cylindrical groove (301), the spirally woven mesh is placed in the graphite mold strip groove (302), and the bottom plate (201), the composite liquid absorbent core and the graphite module are placed in a resistance welding furnace for sintering; at the same time, the cover plate (106) and the second plane screen (105) are meshed and sintered together to form the liquid absorbent core; Step 5, annealing the sintered composite absorbent core and the absorbent core and testing the water absorption of the absorbent core; Step 6: The sintered cover plate (106) and the bottom plate (101) are first placed in a riveting mold for integral molding, and then placed in a diffusion welding graphite mold for diffusion welding, and welded into one body to form a heat spreader; Step 7: Vacuum the heat plate, perform secondary degassing and weld the liquid injection pipe; Step 8: Fill the heat spreader with liquid, trim, level, and perform surface treatment.

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