HEAT SINK BASE AND HEAT SINK

Abstract

Disclosed are a heat sink base and a heat sink. The heat sink base includes a base body. The bottom of the base body is provided with at least one protruded structure, and the bottom of the base body abuts against the top of the CPU. Each of the at least one protruded structure includes a gentle region with a protrusion, and a slope region surrounding the protruded gentle region with the protrusion. The gentle region of the protruded structure abuts against a high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region. Therefore, the heat sink base provided by the present invention has a simple and reasonable structure, and can efficiently dissipate the heat generated by the CPU, thus improving the cooling efficiency and obtaining more stable and more consistent cooling performance.

Claims

1. A heat sink base, comprising a base body, wherein the bottom of the base body is provided with at least one protruded structure, and the bottom of the base body abuts against the top of a CPU; each of the at least one protruded structure comprises a gentle region with a protrusion and a slope region located on the periphery of the gentle region; the gentle region of the protruded structure abuts against a high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region.

2. The heat sink base according to claim 1, wherein the gentle region of the protruded structure is located on an internal region of the protruded structure, and a projection of the slope region is located on two sides, three sides, or the periphery of a projection of the gentle region.

3. The heat sink base according to claim 1, wherein the height of a geometric center point of the gentle region of the protruded structure is greater than or equal to that of the edge of the region, and on a contour line of either side of a horizontal direction of any profile passing through the geometric center point, an absolute value of a vertical height difference corresponding to a unit horizontal distance of any local range in the gentle region is smaller than an absolute value of a vertical height difference corresponding to a unit horizontal distance of any local range in the slope region.

4. The heat sink base according to claim 1, wherein the center of the gentle region of the protruded structure abuts against the center of the high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region.

5. The heat sink base according to claim 1, wherein the center of the gentle region of the protruded structure abuts against the position close to the center of the high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region.

6. The heat sink base according to claim 1, wherein the projection area of the gentle region of the protruded structure is smaller than the area of the top of the CPU.

7. The heat sink base according to claim 1, wherein a projection form of the gentle region of the protruded structure comprises: a circle, an ellipse or a polygon.

8. The heat sink base according to claim 1, wherein a profile counter line of a gentle region part of the protruded structure comprises: a straight line, an arc line or a broken line.

9. The heat sink base according to claim 1, wherein the area of the gentle region of the protruded structure is 20 mm.sup.2 to 254 mm.sup.2.

10. The heat sink base according to claim 1, wherein the area of the gentle region of the protruded structure is 20 mm.sup.2 to 177 mm.sup.2.

11. The heat sink base according to claim 1, wherein the area of the gentle region of the protruded structure is 20 mm.sup.2 to 113 mm.sup.2.

12. The heat sink base according to claim 1, wherein the area of the gentle region of the protruded structure is 20 mm.sup.2 to 79 mm.sup.2.

13. The heat sink base according to claim 1, wherein the area of the gentle region of the protruded structure is 20 mm.sup.2 to 50 mm.sup.2.

14. A heat sink for cooling a CPU, comprising a base body, wherein the bottom of the base body is provided with at least one protruded structure, and the bottom of the base body abuts against the top of a CPU; each of the at least one protruded structure comprises a gentle region with a protrusion and a slope region located on the periphery of the gentle region; the gentle region of the protruded structure abuts against a high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region.

15. The heat sink according to claim 14, wherein the gentle region of the protruded structure is located on an internal region of the protruded structure, and a projection of the slope region is located on two sides, three sides or the periphery of a projection of the gentle region.

16. The heat sink according to claim 14, wherein the height of a geometric center point of the gentle region of the protruded structure is greater than or equal to that of the edge of the region, and on a contour line of either side of a horizontal direction of any profile passing through the geometric center point, an absolute value of a vertical height difference corresponding to a unit horizontal distance of any local range in the gentle region is smaller than an absolute value of a vertical height difference corresponding to a unit horizontal distance of any local range in the slope region.

17. The heat sink according to claim 14, wherein the center of the gentle region of the protruded structure abuts against the center of the high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region.

18. The heat sink according to claim 14, wherein the center of the gentle region of the protruded structure abuts against the position close to the center of the high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region.

19. The heat sink according to claim 14, wherein a projection form of the gentle region of the protruded structure comprises: a circle, an ellipse, or a polygon.

20. The heat sink according to claim 14, wherein a profile contour line of a gentle region part of the protruded structure comprises: a straight line, an are line, or a broken line.

21. The heat sink according to claim 14, wherein the projection area of the gentle region of the protruded structure is smaller than the area of the top of the CPU.

22. The heat sink according to claim 14, wherein the area of the gentle region of the protruded structure is 20 mm.sup.2 to 254 mm.sup.2.

23. The heat sink according to claim 14, wherein the area of the gentle region of the protruded structure is 20 mm.sup.2 to 50 mm.sup.2.

24. The heat sink according to claim 14, further comprising: a cooling fin group, arranged at one end away from the base body: a heat pipe group, comprising at least one heat pipe, wherein the heat pipe comprises a heat adsorption section and a cooling section, the heat adsorption section is arranged on the base body, and the cooling section is arranged in the cooling fin group; and a fixing assembly, configured to fix the base body to the position above the CPU.

25. The heat sink according to claim 14, further comprising: a cooling part, provided with a water inlet and a water outlet; a heat adsorption part, provided with a water inlet and a water outlet, wherein a water pump is arranged inside the heat adsorption part, and the heat adsorption part is arranged on one end of the base body; and a pipeline part, comprising a first pipeline and a second pipeline, wherein one end of the first pipeline and one end of the second pipeline are connected to the water inlet and the water outlet of the cooling part, respectively; and the other end of the first pipeline and the other end of the second pipeline are connected to the water outlet and the water inlet of the heat adsorption part, respectively; and under the action of the water pump, cooling liquid circulates among the cooling part, the pipeline part and the heat absorption part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0075] FIG. 1-1 is a schematic diagram of an axial structure of an existing CPU;

[0076] FIG. 1-2 is a schematic diagram of a profile structure of an existing CPU;

[0077] FIG. 2 is a schematic diagram of temperature distribution on the surface of an existing CPU of model Y;

[0078] FIG. 3 is a schematic diagram of profile forms of two heat sink bases in the prior art;

[0079] FIG. 4-1 is a schematic diagram of a top contour line of an existing CPU with slightly concave surface of model X:

[0080] FIG. 4-2 is a schematic diagram of a top contour line of an existing CPU with slightly convex surface of model X;

[0081] FIG. 5 is a schematic diagram of profiles of existing CPU with three surface forms;

[0082] FIG. 6 shows performance test data of two heat sink bases in the prior art on CPU with different surface forms;

[0083] FIG. 7 is a schematic diagram of adaptation characteristics of a heat sink base in the prior art to the surface of a CPU;

[0084] FIG. 8 is a schematic diagram of a certain profile passing through the center point of a gentle region in accordance with an embodiment of the present invention;

[0085] FIG. 9 is a schematic structure diagram of a heat sink base and a heat sink in accordance with an embodiment of the present invention;

[0086] FIG. 10 is another schematic structure diagram of a heat sink base and a heat sink in accordance with an embodiment of the present invention;

[0087] FIG. 11 is a schematic diagram of three example characteristics of a profile contour line of a gentle region part of a protruded structure in accordance with an embodiment of the present invention;

[0088] FIG. 12 is a schematic diagram showing the performance of a heat sink base as well as a #2 module of a heat sink with four types of different bottoms in accordance with an embodiment of the present invention on a CPU with slightly concave surface;

[0089] FIG. 13 is a schematic diagram showing the performance of a heat sink base as well as a #2 module of a heat sink provided with four types of different bases in accordance with an embodiment of the present invention on a CPU with high flatness;

[0090] FIG. 14 is a schematic diagram showing the performance of a heat sink base as well as a #2 module of a heat sink provided with four types of different bases in accordance with an embodiment of the present invention on a CPU with slightly convex surface;

[0091] FIG. 15 is a schematic diagram showing the performance of a heat sink base as well as a #4 module of a heat sink provided with four types of different bases in accordance with an embodiment of the present invention on a CPU with slightly concave surface;

[0092] FIG. 16 is a schematic diagram showing the performance of a heat sink base as well as a #4 module of a heat sink provided with four types of different bases in accordance with an embodiment of the present invention on a CPU with high flatness;

[0093] FIG. 17 is a schematic diagram showing the performance of a heat sink base as well as a #4 module of a heat sink provided with four types of different bases in accordance with an embodiment of the present invention on a CPU with slightly convex surface:

[0094] FIG. 18 is a schematic diagram showing the positional relationship between a projection of a gentle region and a projection of a slope region in accordance with an embodiment of the present invention;

[0095] FIG. 19 is a schematic diagram showing a projection form of a gentle region part of a protruded structure in accordance with an embodiment of the present invention.

[0096] In the drawings:

[0097] 1—base body; 11—protruded structure; 111—gentle region; 112—slope region; 2—cooling fin group: 3—heat pipe group; 4—cooling fan; 5—heat absorption part; 6—cooling part.

DESCRIPTION OF THE EMBODIMENTS

[0098] Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiments.

[0099] Unless otherwise expressly stated, throughout the specification and claims, the term “including” or its variations such as “containing” or “comprising” may be understood as including the stated elements or components, but not excluding other elements or components.

[0100] In a first aspect, a heat sink according to a preferred embodiment of the present invention includes a base body 1. The bottom of the base body 1 is provided with at least one protruded structure 11, the bottom of the base body 1 abuts against the top of a CPU, and each of the at least one protruded structure 11 includes a gentle region 111 with a protrusion, and a slope region 112 surrounding the gentle region 111. The gentle region 111 is located inside the protruded structure 11, and the slope region 112 is located on the periphery of the gentle region 111. The gentle region 111 of the protruded structure 11 abuts against a high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region 112.

[0101] As shown in FIG. 8, the height of a geometric center point of the gentle region 111 is greater than or equal to that of the edge of the region, and on a contour line of either side of a horizontal direction of any profile passing through the geometric center point, an absolute value ΔH.sub.p of a vertical height difference corresponding to a unit horizontal distance a of any local range in the gentle region 111 is smaller than an absolute value ΔH.sub.d of a vertical height difference corresponding to a unit horizontal distance a of any local range in the slope region 112. i.e., ΔH.sub.p is less than ΔH.sub.d. The gentle region 111 of the protruded structure 11 corresponds to the high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region 112. where ΔH.sub.p=|H.sub.p2−H.sub.p1|, H.sub.p2 is a vertical height of one pint in the gentle region 111, H.sub.p1 is a vertical height of another point in the gentle region 111, and a spacing distance between the two points is the unit horizontal distance a. where ΔH.sub.d=|H.sub.d2−H.sub.d1|, H.sub.d2 is a vertical height of one pint in the slope region 112, H.sub.d1 is a vertical height of another point in the slope region 112, and a spacing distance between the two points is the unit horizontal distance a.

[0102] As shown in FIG. 18, the gentle region 111 of the protruded structure 11 is located on an internal region of the protruded structure 11, and a projection of the slope region 112 is located on two sides of a projection of the gentle region 111.

[0103] As shown in FIG. 18, the gentle region 111 of the protruded structure 11 is located on an internal region of the protruded structure 11, and a projection of the slope region 112 is located on three sides of a projection of the gentle region 111.

[0104] As shown in FIG. 18, the gentle region 111 of the protruded structure 1l is located on an internal region of the protruded structure 11, and a projection of the slope region 112 is located on the periphery of a projection of the gentle region 111.

[0105] In an embodiment of the present invention, the center of the gentle region 111 of the protruded structure 11 abuts against the center of the high heat flux region at the top of the CPU or the position close to the center of the high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region 112. That is, the center of the gentle region 111 abuts against the center of the high heat flux region at the top of the CPU or the position close to the center above. As shown in FIG. 9 and FIG. 10, the gentle region 111 is located inside the protruded structure 11, but the position of the gentle region 111 is not limited in the present invention. The gentle region 111 may be located on other positions of the bottom of the base body 1 (not shown in figure specifically), as long as the center of the gentle region 111 abuts against with the center of the high heat flux region at the top of the CPU or the position close to the center above. That is, the specific position of the high heat flux region at the top of the CPU is also not limited in the present invention.

[0106] In an embodiment of the present invention, the projection area of the gentle region 111 of the protruded structure 11 is smaller than the area of the top of the CPU.

[0107] As shown in FIG. 19, in an embodiment of the present invention, a projection form of the gentle region 111 of the protruded structure 11 is circular.

[0108] As shown in FIG. 19, in an embodiment of the present invention, a projection form of the gentle region 111 of the protruded structure 11 is elliptic.

[0109] As shown in FIG. 19, in an embodiment of the present invention, a projection form of the gentle region 111 of the protruded structure 11 is polygonal.

[0110] FIG. 11 is a schematic diagram of three example characteristics of the gentle region 111 of the protruded structure 1I at the bottom of the heat sink in accordance with an embodiment of the present invention. As shown in FIG. 11, when the projection form of the gentle region 111 is circular, the profile contour line of the gentle region 111 includes a straight line, an arc line or a broken line. Three different forms of gentle regions 111 correspondingly adapt to the high heat flux region at the top of the CPU.

[0111] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 254 mm.sup.2.

[0112] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 177 mm.sup.2.

[0113] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 113 mm.sup.2.

[0114] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 79 mm.sup.2.

[0115] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 50 mm.sup.2.

[0116] In a second aspect, a heat sink according to another embodiment of the present invention is configured to cool a CPU. The heat sink includes a base body 1. The bottom of the base body 1 is provided with at least one protruded structure 11, the bottom of the base body 1 abuts against the top of a CPU, and each of the at least one protruded structure 11 includes a gentle region 111 with a protrusion, and a slope region 112 surrounding the gentle region 111. The gentle region is located inside the protruded structure 11, and the slope region 112 is located on the periphery of the gentle region 111. The gentle region 111 of the protruded structure 11 abuts against a high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region 112.

[0117] In an embodiment of the present invention, as shown in FIG. 8, the height of a geometric center point of the gentle region 111 is greater than or equal to that of the edge of the region, and on a contour line of either side of a horizontal direction of any profile passing through the geometric center point, an absolute value ΔH.sub.p of a vertical height difference corresponding to a unit horizontal distance a of any local range in the gentle region 111 is smaller than an absolute value ΔH.sub.d of a vertical height difference corresponding to a unit horizontal distance a of any local range in the slope region 112. i.e., ΔH.sub.p is less than ΔH.sub.d. The gentle region 111 of the protruded structure 11 corresponds to the high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region 112. where ΔH.sub.p=|H.sub.p2−H.sub.p1|, H.sub.p2 is a vertical height of one pint in the gentle region 111, H.sub.p1 is a vertical height of another point in the gentle region 111, and a spacing distance between the two points is the unit horizontal distance a. where ΔH.sub.d=|H.sub.d2−H.sub.d1|, H.sub.d2 is a vertical height of one pint in the slope region 112, H.sub.d1 is a vertical height of another point in the slope region 112, and a spacing distance between the two points is the unit horizontal distance a.

[0118] As shown in FIG. 18, the gentle region 111 of the protruded structure 11 is located on an internal region of the protruded structure 11, and a projection of the slope region 112 is located on two sides of a projection of the gentle region 111.

[0119] As shown in FIG. 18, the gentle region 111 of the protruded structure 11 is located on an internal region of the protruded structure 11, and a projection of the slope region 112 is located on three sides of a projection of the gentle region 111.

[0120] As shown in FIG. 18, the gentle region 111 of the protruded structure 11 is located on an internal region of the protruded structure 11, and a projection of the slope region 112 is located on the periphery of a projection of the gentle region 111.

[0121] In an embodiment of the present invention, the center of the gentle region 111 of the protruded structure 11 abuts against the center of the high heat flux region at the top of a CPU or the position close to the center of the high heat flux region at the top of the CPU, thus forming a region with relatively high pressure and relatively stable pressure compared with the slope region 112. That is, the center of the gentle region 111 abuts against the center of the high heat flux region at the top of the CPU or the position close to the center above. As shown in FIG. 9 and FIG. 10, the gentle region 111 is located inside the protruded structure 11, but the position of the gentle region 111 is not limited in the present invention. The gentle region 111 may be located on other positions of the bottom of the base body 1 (not shown in figure specifically), as long as the center of the gentle region 111 abuts against with the center of the high heat flux region at the top of the CPU or the position close to the center above. That is, the specific position of the high heat flux region at the top of the CPU is also not limited in the present invention.

[0122] In an embodiment of the present disclosure, as shown in FIG. 9, the heat sink further includes: a cooling fin group 2, a heat pipe group 3, and a cooling fan 4. The cooling fin group 2 is arranged above the base body 1. The heat pipe group 3 includes a plurality of heat pipes, where each heat pipe includes a heat adsorption section and a cooling section, the heat adsorption section is arranged on the base body 1, and the cooling section is arranged in the cooling fin group 2. The cooling fan 4 is fixed to the cooling fin group 2. Heat-conductive silicone grease is arranged between the base body 1 and the CPU. The fixing assembly is configured to fix the base body 1 to the position above the CPU. In other embodiments of the present invention, the heat sink may not be provided with the cooling fan, or may be provided with a plurality of cooling fans.

[0123] In an embodiment of the present disclosure, as shown in FIG. 10, the heat sink further includes: a cooling part 6, a heat absorption part 5, and a pipeline part. The cooling part 6 is provided with a water inlet and a water outlet. The heat adsorption part 5 is provided with a water inlet and a water outlet, a water pump is arranged inside the heat adsorption part 5, and the heat adsorption part 5 is arranged on one end of the base body 1. The pipeline part includes a first pipeline and a second pipeline, one end of the first pipeline and one end of the second pipeline are connected to the water inlet and the water outlet of the cooling part 6, respectively; and the other end of the first pipeline and the other end of the second pipeline are connected to the water outlet and the water inlet of the heat adsorption part 5, respectively; and under the action of the water pump, cooling liquid circulates among the cooling part 6, the pipeline part and the heat absorption part 5.

[0124] In an embodiment of the present invention, the projection area of the gentle region 111 of the protruded structure 11 is smaller than the area of the top of the CPU.

[0125] As shown in FIG. 19, in an embodiment of the present invention, a projection form of the gentle region 111 of the protruded structure 11 is circular.

[0126] As shown in FIG. 19, in an embodiment of the present invention, a projection form of the gentle region 111 of the protruded structure 11 is elliptic.

[0127] As shown in FIG. 19, in an embodiment of the present invention, a projection form of the gentle region 111 of the protruded structure 11 is polygonal.

[0128] In an embodiment of the present invention, a profile contour line of a gentle region 111 part of the protruded structure 11 is a straight line.

[0129] In an embodiment of the present invention, a profile contour line of a gentle region 111 part of the protruded structure 11 is an arc line.

[0130] In an embodiment of the present invention, a profile contour line of a gentle region 111 part of the protruded structure 11 is a broken line.

[0131] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 254 mm.sup.2.

[0132] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 177 mm.sup.2.

[0133] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 113 mm.sup.2.

[0134] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 79 mm.sup.2.

[0135] In an embodiment of the present invention, the area of the gentle region 111 of the protruded structure 11 is 20 mm.sup.2 to 50 mm.sup.2.

[0136] The physical characteristics of the heat sink is that any protruded structure 11 includes a gentle region 111, and a slope region 112 corresponding to the gentle region 111. The gentle region 111 is located on the internal region of the protruded structure 11, and the slope region 112 is located on the periphery of the gentle region 111. In the gentle region 111, the height of the geometric center point of the region is greater than or equal to that of the edge of the region, and on a contour line of either side of a horizontal direction of any profile passing through the geometric center point, an absolute value of a vertical height difference corresponding to a unit horizontal distance of any local range in the gentle region 111 is smaller than an absolute value of a vertical height difference corresponding to a unit horizontal distance of any local range in the slope region 112. As the flat region 11I is the top region of the protruded structure 11, larger pressure may be formed when the flat region 111 abuts against the surface of the CPU. Moreover, the height change in the unit horizontal distance in the gentle region 111 is less than that in the slope region 112, so the pressure change in the gentle region 111 is less than that of the peripheral slope region 112. FIG. 11 shows the form characteristics of the gentle region in three embodiments of the patent technology.

[0137] In actual application, the differences in the surface forms of the CPU in reality have been discovered through in-depth study. By combining the internal and external structural characteristics, the heat generation mechanism and the technical development trend of the CPU, the test results of adaptation performance of different heat sink bottom forms and CPU with different surface characteristics are analyzed by cross comparison with the measured data of a large number of experimental samples, and a brand-new heat sink base bottom design structure with a region with stable and high pressure is creatively designed, which is described as follows.

[0138] It is noted in the present invention that there is a specific region range for both the temperature gradient characteristics formed on the surface of the CPU chip due to heat generation and the measured convex-concave deformation characteristics of the surface form of CPU, and the two types of regional ranges have high coincidence. Therefore, a protruded gentle region 111 with specified area is designed at the bottom of the heat sink base for the region (high heat flux region) corresponding to the position of the internal chip of the corresponding CPU, which can better adapt to the CPU with different surface forms to form a region with relatively high pressure and relatively stable pressure. In this region, the pressure is larger but the pressure change is smaller, and outside this region is the slope region 112, which is smaller in pressure but larger in pressure change. In the range of the gentle region 111 with a certain set area of protrusion, the design enables the formation of similar pressure characteristics within the range of the preset area of the gentle region 111 when adapting to the CPU with different form, the similar interface material thickness δ is obtained, and the similar thermal contact resistance is obtained, and thus the more consistent cooling performance can be obtained compared with the prior art. Secondly, due to the features of the protruded structure, the pressure at the gentle region 111 is relatively high, and the area can be guaranteed through the arrangement of the gentle region 111. Therefore, the smaller average interface material thickness δ can be obtained in a determined range, and the small average thermal contact resistance is obtained. Meanwhile, due to the fact that the protruded gentle region 111 corresponds to the high heat flux region on the surface of the CPU, better cooling effect can be obtained.

[0139] The advantages and performance of the present invention are presented mainly from two dimensions:

[0140] 1. More consistent and more stable performance can be obtained on a CPU with one or several surface forms than in the prior art.

[0141] 2. More comprehensive performance can be obtained on a CPU with one or several surface forms than in the prior art.

[0142] The above advantages and performance of the present invention are illustrated by the test analysis of a specific embodiment below.

[0143] (1) CPU samples with three top surface forms: X is a CPU of a certain model, with super-frequency power consumption up to 280 w. Eleven CPU of this specification are selected randomly, and it is found that the surface forms of the CPU are as follows: three CPU are slightly concave in surface, one CPU is high in surface flatness, and seven CPU are slightly convex in surface, one is selected from each of the three types of CPU as the CPU used in the test;

[0144] (2) Replacement of the bases of the samples with bases with different bottom forms: a total of six heat pipe fin groups are provided in the test, which are divided into two sample groups, and respectively marked as a #1, #2 and #3 heat pipe fin group, and a #4, #5 and #6 heat pipe fin group. No any change is made to the heat pipe fin group each time the heat sink base is replaced. The combination of each heat pipe fin group and its matching base is shown in Table 2.

TABLE-US-00002 TABLE 2 The matching combination of six heat pipe fin sets and their matching copper bases First Second Third replacement replacement replacement Initial base of base of base of base #1, #2 and #3 heat Flat base A.sub.stp = A.sub.stp = A.sub.stp = pipe fin group 177 mm.sup.2 113 mm.sup.2 254 mm.sup.2 #4, #5 and #6 heat Tapered A.sub.stp = A.sub.stp = A.sub.stp = pipe fin group convex base 79 mm.sup.2 50 mm.sup.2 20 mm.sup.2

[0145] In the table, A.sub.stp refers to the projection area of the gentle region 111 of the protruded structure 11 of the base.

[0146] By taking the #1 heat pipe fin group as an example, an initial operation is to weld a flat base, and after the test is completed, the flat base is subjected to back-welding, then a base with A.sub.stp=177 mm.sup.2 is welded; and above action is repeated to replace the base with a base with A.sub.stp=113 mm.sup.2 as well as a base with A.sub.stp=254 mm.sup.2. For the other five samples, the base replacement operation and test are carried out according to this method, so as to obtain the samples representing different gentle region 111 area as well as test data.

[0147] (3) Test conditions: Every time samples with different bases are obtained, the samples are tested on CPU with three surface forms. Test equipment is provided strictly and uniformly from beginning to end, and the experimental environment temperature is controlled at 23° C. to 25° C. Uniform specifications of heat-conductive silicone grease, heat pipes, cooling fin groups, base materials and consistent processing and assembly technology are adopted for testing, and the consistent fastener pressure value is guaranteed.

[0148] The advantages of the present invention are described below in conjunction with the test data and charts.

[0149] Firstly, the present invention is obtained on the basis of pioneering research on the adaption relationship between the surface form of a CPU and the bottom of a heat sink base. Therefore, compared with the prior art, the application of the present invention can enable the heat sink to obtain more stable and more consistent cooling performance when adapting to CPU with different surface forms, thus greatly improving the reliability of products.

[0150] Table 3 is the performance of three sample groups on a CPU with slightly concave surface, the three sample groups are a flat base sample group, a tapered convex base sample group, and a sample group with A.sub.stp=50 mm.sup.2 in the present invention. There are three samples in each sample group, and the average performance is an average value of the test performance of the three samples, and the standard deviation and range are used to characterize the discrete characteristics and performance consistency of the samples in the sample group. It can be known from the data that the sample group with A.sub.stp=50 mm.sup.2 obtains more stable and more consistent cooling performance is obtained in the performance test of adapting to the CPU with slightly concave surface, and meanwhile, the average performance of the sample group with A.sub.stp=50 mm.sup.2 is also superior to that of two sample groups in the prior art.

TABLE-US-00003 TABLE 3 Performance of three sample groups on the CPU with CPU with slightly concave surface (silicon grease B for testing) Performance of three samples in each sample Average Standard group/° C. performance/° C. deviation/° C. Range/° C. Flat base sample group 70.3 70.6 0.35 0.7 71 70.6 Tapered convex base 69.4 69.6 0.68 1.3 sample group 69.1 70.4 Sample group with 67.5 67.5 0.10 0.2 A.sub.stp = 67.4 50 mm.sup.2 67.6 in the present invention

[0151] Table 4 shows the performance of the three sample groups on a CPU with high flatness, it can be known from the data that the sample group with A.sub.stp=50 mm.sup.2 obtains more stable and more consistent cooling performance is obtained in the performance test of adapting to the CPU with high flatness, and meanwhile, the average performance of the sample group with A.sub.stp=50 mm.sup.2 is also superior to that of two sample groups in the prior art.

TABLE-US-00004 TABLE 4 Performance of three sample groups on the CPU with high flatness (silicon grease B for testing) Performance of three samples in each sample Average Standard group/° C. performance/° C. deviation/° C. Range/° C. Flat base sample group 68.3 69.2 0.78 1.5 69.8 69.4 Tapered convex base 68.4 68.9 1.01 1.8 sample group 68.3 70.1 Sample group with 66.3 66.5 0.20 0.4 A.sub.stp = 66.5 50 mm.sup.2 66.7 in the present invention

[0152] Table 5 shows the performance of the three sample groups on a CPU with slightly convex surface, it can be known from the data that the sample group with A.sub.stp=50 mm.sup.2 obtains more stable and more consistent cooling performance in the performance test of adapting to the CPU with slightly convex surface, and meanwhile, the average performance of the sample group with A.sub.stp=50 mm.sup.2 is also superior to that of two sample groups in the prior art.

TABLE-US-00005 TABLE 5 Performance of three sample groups on the CPU with slightly convex surface (silicon grease B for testing) Performance of three samples in each sample Average Standard group/° C. performance/° C. deviation/° C. Range/° C. Flat base sample group 68.6 69.3 0.70 1.4 70 69.2 Tapered convex base 71.3 71.8 1.14 2.1 sample group 71 73.1 Sample group with 68.0 67.7 0.26 0.5 A.sub.stp = 67.6 50 mm.sup.2 67.5 in the present invention

[0153] By summarizing the content in Table 3, Table 4 and Table 5, it can be known from the data that the sample group with A.sub.stp=50 mm.sup.2 obtains more stable and more consistent cooling performance in the performance test of adapting to the CPU with slightly concave surface, the CPU with high flatness, and the CPU with slightly convex surface, and meanwhile, the average performance of the sample group with A.sub.stp=50 mm.sup.2 is also superior to that of two sample groups in the prior art.

[0154] Table 6 shows the performance of the three sample groups on three types of CPU, it can be known from the data that the sample group with A.sub.stp=50 mm.sup.2 obtains more stable and more consistent cooling performance in the performance test of adapting to three types of CPU with different surface forms, and meanwhile, the average performance of the sample group with A.sub.stp=50 mm.sup.2 is also superior to that of two sample groups in the prior art.

TABLE-US-00006 TABLE 6 Summary of performance of three sample groups on three types of CPU (silicon grease B for testing) Average Average Average performance of performance Average performance sample groups on the CPU performance on the CPU on the CPU with slightly on the CPU with slightly with three Standard concave with high convex surface deviation/ Range/ surface /° C. flatness/° C. surface/° C. forms/° C. ° C. ° C. Flat base sample 70.6 69.2 69.3 69.7 0.82 1.5 group Tapered convex 69.6 68.9 71.8 70.1 1.49 2.9 base sample group Sample group with 67.5 66.5 67.7 67.2 0.64 1.2 A.sub.stp = 50 mm.sup.2 in the present invention.

[0155] Secondly, considering the development trend of multi-core, multi-threaded, high-performance, and higher power density of the CPU core heating zone (DIE) of the CPU, the bottom region of the heat sink base corresponding to the CPU core heating zone (DIE) has been designed in a pioneering way to achieve lower thermal resistance and better cooling performance.

[0156] FIG. 12 shows the performance test data of the #2 heat pipe fin group provided with four types of bases on the CPU with slightly concave surface, these four bases are: a flat base, as well as the base with A.sub.stp=254 mm.sup.2, the base with A.sub.stp=177 mm.sup.2 and the base with A.sub.stp=113 mm.sup.2 in the present invention. It can be known from the data that, on the CPU with slightly concave surface, the three types of bases with protruded structures 11 with gentle regions 111 all have better cooling efficiency than the flat base in the prior art.

[0157] FIG. 13 shows the performance test data of the #2 heat pipe fin group provided with four types of bases on the CPU with high flatness. It can be known from the data that, on the CPU with high flatness, the three types of bases with protruded structures 11 with gentle regions 111 all have better cooling efficiency than the flat base in the prior art.

[0158] FIG. 14 shows the performance test data of the #2 heat pipe fin group provided with four types of bases on the CPU with slightly convex surface, it can be known from the data that, on the CPU with slightly convex surface, the base with A.sub.stp=254 mm.sup.2 has better cooling efficiency than the flat base in the prior art.

[0159] Similar to above, FIG. 15, FIG. 16 and FIG. 17 show the performance test data of the #4 module provided with four types of bases on the CPU with slightly concave surface, the CPU with high flatness, and the CPU with slightly convex surface, these four bases are: a tapered convex base, as well as the base with A.sub.stp=79 mm.sup.2, the base with A.sub.stp=50 mm.sup.2 and the base with A.sub.stp=20 mm.sup.2 in the present invention. It can be known from the data that, on the CPU with three surface forms, the three types of bases with protruded structures 11 with gentle regions 111 all have better cooling efficiency than the tapered convex base in the prior art.

[0160] In conclusion, the bottom of the base body 1 is provided with at least one protruded structure 11. The protruded structure 11 includes a protruded gentle region 111 and a slope region 112, and entirely abuts against the surface of the CPU. The gentle region 111 of the protruded structure 11 has relatively high and relatively stable pressure compared with the slope region 112, and the number of the protruded structures is not limited in the present invention.

[0161] Moreover, in the electronic equipment cooling industry or other industries, as long as the cooling problem is involved, the structure of the base body 1 defined by the present invention can be used for the cooling of equipment, thereby greatly improving the cooling efficiency and the consistency and reliability of product performance.

[0162] In conclusion, the heat sink base and the heat sink provided by the present invention have a simple and reasonable structure, can better adapt to the CPU with different surface forms to reduce thermal contact resistance, can efficiently dissipate the heat generated by the CPU to improve the cooling efficiency, and can obtain more stable and more consistent cooling performance, thus greatly improving the reliability of the product.

[0163] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and exemplary purposes. These descriptions are not intended to limit the present invention to the precise form disclosed, and apparently, many changes and variations may be made in accordance with the above teachings. The exemplary embodiments are chosen and described for the purpose of explaining the particular principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize a variety of different exemplary embodiments of the present invention, as well as a variety of different options and variations. The scope of the present invention is intended to be defined by the claims and their equivalent forms.