A phase change heat spreader

Abstract

The application relates to a phase change radiator, comprising: a base, which defines a width direction and a length direction perpendicular to each other in an extension plane of the base, the base being provided with a storage cavity in which a phase change medium is stored; and a radiating fin supported on the top of the base, the radiating fin being arranged at equal intervals along the width direction and being provided with a flow channel; wherein the radiating fin comprises: first fins and second fins arranged at intervals along the width direction, a connecting portion and a communicating portion connected to the bottom of the first fins and the second fins, the communicating portion communicating the storage cavity and the flow channel, the first fins and the second fins extending along the length direction and a height direction perpendicular to the extension plane of the base; and the communicating portion comprises a first communicating portion communicating with the storage cavity and a second communicating portion connected between the first communicating portion and the flow channel, wherein the first communicating portion is offset from the second communicating portion in the length direction.

Description

Technical Field

[0001] This application relates to the field of heat dissipation equipment technology, and in particular to a phase change heat sink. Background Technology

[0002] Phase change heat sinks typically consist of a base and multiple phase change fins fixed to the base. The phase change fins have numerous connection points with the base, and the fins are connected to the internal channels of the base. If a leak occurs, that area of ​​the heat sink will fail. Therefore, most of them have extremely high requirements for welding reliability.

[0003] However, in practical applications, such as Figure 1 As shown, the bulge at the bottom of the U-shaped blow-in tooth connecting the substrate hole and the U-shaped bend connecting the two sides of the tooth are on the same vertical section. The bend of the U-shaped blow-in tooth in the magnified view is prone to buckling and collapse, thereby reducing the flow cross-sectional area. In addition, due to the cavity inside the tooth during bending, it cannot hold the rounded corner of the mold, resulting in the transition rounded corner of the welding surface being larger than the design value and uncontrollable, which in turn reduces the welding width and reduces the reliability of the weld. Summary of the Invention

[0004] The embodiments of this application provide a phase change heat sink, which separates the connecting part of the heat sink fins and the base into two mutually offset parts, thereby separating the connecting part of the heat sink fins and the base from the bent part of the heat sink fins themselves, so as to avoid the problem of reduced solder joint reliability caused by the bent structure of the heat sink fins.

[0005] In one embodiment of this application, a phase change heat sink is provided, comprising:

[0006] A base, defining mutually perpendicular width and length directions within an extending plane of the base, the base having a storage cavity for storing a phase change medium;

[0007] The heat dissipation fins are supported on the top of the base and are arranged at equal intervals along the width direction. Each heat dissipation fin has a flow channel.

[0008] The heat dissipation fins include: a first fin and a second fin spaced apart along the width direction, a connecting portion and a communicating portion connected to the bottom of the first fin and the second fin, the communicating portion connecting the storage cavity and the flow channel, and the first fin and the second fin extending along the length direction and the height direction perpendicular to the extension plane of the base.

[0009] The connecting portion includes a first connecting portion communicating with the storage cavity, and a second connecting portion connecting the first connecting portion and the flow channel, wherein the first connecting portion is offset from the second connecting portion in the length direction.

[0010] In one embodiment, the heat dissipation fins are fixedly connected to the top of the base via the first connecting portion and the connecting portion.

[0011] In one embodiment, the connecting portion and the connecting portion are isolated from each other.

[0012] In one embodiment, the top of the base has an opening communicating with the storage cavity.

[0013] The first connecting portion includes a bottom wall and an arc-shaped top wall that surrounds the bottom wall to form an internal cavity. The bottom wall has a central hole that aligns with the opening, and the diameter of the bottom wall is larger than the diameter of the central hole.

[0014] The first connecting portion is fixedly connected to the top of the base via the bottom wall.

[0015] In one embodiment, the connecting portion includes a third connecting portion connecting the first connecting portion and the second connecting portion.

[0016] The third connecting portion extends along the length direction and penetrates the arc-shaped top wall to communicate with the storage cavity via the internal cavity.

[0017] In one embodiment, the second connecting portion includes a pair of arcuate arms that communicate with the flow channels of the first toothed plate and the second toothed plate, respectively.

[0018] In one embodiment, the radius of the arc-shaped arm is greater than the radius of the connection between the connecting portion and the first and second toothed plates.

[0019] In one embodiment, the radius of the arc-shaped arm is greater than 10 mm.

[0020] In one embodiment, the flow channels are distributed in the first toothed plate and the second toothed plate, and the flow channels of the first toothed plate and the flow channels of the second toothed plate are connected only through the second connecting portion.

[0021] In one embodiment, the connecting portion is connected to one end of the bottom of the first toothed plate and the second toothed plate in the length direction.

[0022] In this example, by separating the connecting portion of the heat sink fins and the base into two mutually offset parts, the connecting portion of the heat sink fins and the base is separated from the bent portion of the heat sink fins themselves. Thus, the connecting portion is not affected by the bending of the bent portion, thereby increasing the connecting area of ​​the connecting portion and avoiding the problem of reduced solder joint reliability caused by the bending structure of the heat sink fins. Furthermore, the bending radius of the bent portion is also not affected by the connecting portion, thereby avoiding the problem of buckling collapse by increasing the bending radius of the bent portion. Attached Figure Description

[0023] The following figures are for illustrative purposes only and do not limit the scope of this application.

[0024] Figure 1 This is a schematic diagram of an existing toothed radiator.

[0025] Figure 2 This is a schematic diagram of the phase change heat sink in the embodiments of this application.

[0026] Figure 3 and Figure 4 This is a schematic diagram of the connecting portion in an embodiment of this application.

[0027] Figure 5 This is a cross-sectional view of the heat dissipation fins in the embodiments of this application. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of the invention, specific embodiments of the invention are now described with reference to the accompanying drawings, in which the same reference numerals denote the same parts.

[0029] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0030] To keep the drawings concise, only the parts relevant to the invention are shown in each figure, and do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of the components with the same structure or function is shown schematically, or only one is labeled.

[0031] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0032] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0033] In this document, terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several subranges contained therein.

[0034] The embodiments of this application provide a phase change heat sink, which separates the connecting part of the heat sink fins and the base into two mutually offset parts, thereby separating the connecting part of the heat sink fins and the base from the bent part of the heat sink fins themselves, so as to avoid the problem of reduced solder joint reliability caused by the bent structure of the heat sink fins.

[0035] The exemplary embodiments will now be described more fully with reference to the accompanying drawings.

[0036] like Figures 2 to 5 As shown, one embodiment of this application provides a phase change heat sink, comprising:

[0037] The base 1 defines a width direction W and a length direction L that are perpendicular to each other in the extension plane of the base 1. The base 1 has a storage cavity in which a phase change medium is stored.

[0038] Heat dissipation fins 2 are supported on the top of the base 1. The heat dissipation fins 2 are arranged at equal intervals along the width direction W. The heat dissipation fins 2 have flow channels inside.

[0039] The heat dissipation fin 2 includes: a first fin 11 and a second fin 12 spaced apart along the width direction W, a connecting portion 13 and a communicating portion 14 connected to the bottom of the first fin 11 and the second fin 12, the communicating portion 14 connecting the storage cavity and the flow channel, the first fin 11 and the second fin 12 extending along the length direction L and the height direction H perpendicular to the extension plane of the base 1.

[0040] The connecting portion 14 includes a first connecting portion 141 communicating with the storage cavity, and a second connecting portion 142 connecting the first connecting portion 141 and the flow channel, wherein the first connecting portion 141 is offset from the second connecting portion 142 in the length direction L.

[0041] The heat dissipation fin 2 includes a first fin 11 and a second fin 12 arranged in parallel, each having a flow channel for the phase change medium to circulate. The bottoms of the first fin 11 and the second fin 12 are connected by a connecting portion 13 to form a U-shaped structure. The connecting portion 13 is perpendicular to both the first fin 11 and the second fin 12. If a cavity communicating with the flow channel were provided within the connecting portion 13, buckling and collapse would easily occur. Therefore, in this example, the connecting portion 13 is only used for structural support, connecting the first fin 11 and the second fin 12 and supporting the heat dissipation fin 2 on the base 1, and is not used to provide a cavity communicating with the flow channel.

[0042] In this example, the connecting portion 14 provides a connecting cavity, comprising a first connecting portion 141 communicating with the storage cavity, and a second connecting portion 142 connecting the first connecting portion 141 and the flow channel. The storage cavity is located within the base 1, the extending plane of which can be considered, for example, horizontal, while the flow channel is located within the first toothed plate 11 and the second toothed plate 12, the extending directions of which can be considered, for example, vertical. To accommodate communication between two components with different extending directions, the first connecting portion 141 and the second connecting portion 142 in this example are offset in the length direction L, such that the first connecting portion 141 and the second connecting portion 142 can be provided with different shapes and different extending directions to provide stable support and reliable communication structures, respectively.

[0043] In existing radiators, the connecting part is used to provide both structural support and connectivity. To provide connectivity, it is made into a hollow structure. A hollow structure cannot provide stable structural support, which is why buckling and collapse are prone to occur.

[0044] In this example, separating the structural support and the connecting structure can both increase the area of ​​the support structure and eliminate the buckling collapse problem by setting the connecting structure to a non-right-angle corner form.

[0045] The heat dissipation fins 2 are fixedly connected to the top of the base 1 via the first connecting portion 141 and the connecting portion 13.

[0046] Since the first connecting portion 141 communicates with the storage cavity, it is fixedly connected to the top of the base 1 to ensure communication with the storage cavity. Similarly, the connecting portion 13 is also fixedly connected to the top of the base 1 to provide stable support for the heat sink fins 2.

[0047] In the connecting portion 14, the first connecting portion 141 provides structural support, while the second connecting portion 142 only provides a connecting structure.

[0048] In one embodiment, the connecting portion 14 and the connecting portion 13 are isolated from each other. The connecting portion 14 is connected to one end of the bottom of the first toothed piece 11 and the second toothed piece 12 in the longitudinal direction.

[0049] The connecting part 14 and the connecting part 13 are isolated from each other by an annular groove, which eliminates the need for bending and rounding around the connecting part, thereby increasing the welding area and improving the quality of the weld. At the same time, the forces such as external falling balls and angle steel impacts on the toothed piece will not be transmitted to the weld, avoiding the influence of uncontrollable environmental factors.

[0050] Specifically, the top of the base 1 has an opening communicating with the storage cavity. The first communicating part 141 includes a bottom wall 1411 and an arc-shaped top wall 1412 that surrounds the bottom wall 1411 to form an internal cavity. The bottom wall 1411 has a central hole 1413 that mates with the opening. The diameter of the bottom wall 1411 is larger than the diameter of the central hole 1413.

[0051] The first connecting part 141 is fixedly connected to the top of the base 1 via the bottom wall 1411.

[0052] In this example, the bottom wall 1411 has a central hole 1413 that mates with the opening, and the bottom wall 1411 surrounding the central hole 1413 is used for fixed connection with the top of the base 1. The periphery of the arc-shaped top wall 1412 is connected to the periphery of the bottom wall 1411, and the arched portion of the arc-shaped top wall 1412 is used to form an internal cavity, which communicates with the storage cavity via the central hole 1413.

[0053] The diameter of the central hole 1413 corresponds to the opening of the base 1. All the area of ​​the bottom wall 1411 except for the central hole 1413 can be used for welding connection with the base 1. The diameter of the bottom wall 1411 is adjustable. By increasing the diameter of the bottom wall 1411, the connection area between the first connecting part 141 and the base 1 can be expanded, thereby improving the connection stability between the heat dissipation fin 2 and the base 1. The quality of the weld point is increased by increasing the welding area.

[0054] The connecting portion 14 includes a third connecting portion 143 connected between the first connecting portion 141 and the second connecting portion 142. The third connecting portion 143 extends along the length direction L and penetrates the arc-shaped top wall 1412 to communicate with the storage cavity via the internal cavity.

[0055] The second connecting portion 142 is used to communicate with the flow channel in the heat dissipation fin 2. Since the second connecting portion 142 involves a change in direction, the second connecting portion 142 is isolated from the first connecting portion 141 via the third connecting portion 143.

[0056] The phase change medium in the base 1 enters the first connecting part 141 vertically and then propagates horizontally. The phase change medium in the connecting part 14 needs to change from horizontal to vertical to enter the heat dissipation fins. Therefore, the first connecting part 141 is used to guide the phase change medium in a direction perpendicular to the base 1 (i.e., in the extension direction of the heat dissipation fins 2), while the second connecting part 142 is used to guide the phase change medium from horizontal to vertical.

[0057] Specifically, the second connecting portion 142 includes a pair of arc-shaped arms 1421 that are respectively connected to the flow channels of the first toothed piece 11 and the second toothed piece 12.

[0058] In conventional setups, the transition between the heat sink fins and the connecting parts is mostly achieved through chamfering. However, it is conceivable that the cavity radius at the bend is necessarily smaller than the gap at the flat surface, which not only hinders the flow of the phase change medium but also easily leads to buckling and collapse.

[0059] In this example, the second connecting portion 142 is formed as a pair of arc-shaped arms 1421, which are respectively connected to the connecting channels in the first toothed piece 11 and the second toothed piece 12. In each arc-shaped arm 1421, one end can be formed in a horizontal direction to connect to the third connecting portion 143, and the other end can be formed in a vertical direction to connect to the first toothed piece 11 or the second toothed piece 12. The middle portion of the two ends is arc-shaped to ensure that the cavity size in the second connecting portion 142 is not affected by the bending portion.

[0060] Even after designing the U-shaped arc arm 1421 and adding the annular groove, the connecting part may still have cavity bending. In this case, we can independently increase the bending radius of the arc arm 1421 to further avoid the probability of buckling and collapse. Of course, we can also use a secondary blown tooth plate for correction.

[0061] The radius of the arc arm 1421 is greater than the radius of the connection between the connecting part 13 and the first toothed piece 11 and the second toothed piece 12.

[0062] In one specific example, the radius of the arc arm 1421 is greater than 10 mm.

[0063] The second connecting portion 142 is independent of the connecting portion 13 and the first connecting portion 141, so the radius of the arc arm 1421 can be adjusted independently to eliminate the influence of the bend radius on the internal cavity of the connecting portion.

[0064] The flow channels are distributed in the first toothed plate 11 and the second toothed plate 12, and the flow channels of the first toothed plate 11 and the second toothed plate 12 are connected only through the second connecting part 142.

[0065] To increase the heat dissipation area, the flow channels in the first toothed plate 11 and the second toothed plate 12 are arranged in a meandering manner with repeated bends. Specifically, the flow channels can be arranged in a manner that extends along the vertical direction and bends along the length direction.

[0066] When the temperature rises, the phase change medium inside the base 1 changes from a liquid to a gaseous state and expands in volume. It then enters the flow channels in the first toothed plate 11 and the second toothed plate 12 through the opening in the base 1 via the connecting part 13, so as to exchange heat with the outside air through the surface of the heat dissipation toothed plate. After the phase change medium dissipates heat, it changes from a gaseous state back to a liquid state and shrinks in volume, and flows back into the base 1 under the action of gravity.

[0067] The embodiments of this application provide a phase change heat sink. By separating the connecting portion of the heat sink fins and the base into two mutually offset parts, the connecting portion of the heat sink fins and the base is separated from the bent portion of the heat sink fins themselves. Thus, the connecting portion is not affected by the bending of the bent portion, thereby increasing the connecting area of ​​the connecting portion and avoiding the problem of reduced solder joint reliability caused by the bending structure of the heat sink fins. Furthermore, the bending radius of the bent portion is also not affected by the connecting portion, thereby avoiding the problem of buckling and collapse by increasing the bending radius of the bent portion.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A phase change heat spreader, comprising: The application relates to a heat dissipation fin (2) of a phase change memory device. The heat dissipation fin (2) comprises a first fin (11) and a second fin (12) arranged in the width direction (W), a connecting part (13) and a communicating part (14) connected to the bottom of the first fin (11) and the second fin (12), the communicating part (14) communicates the storage cavity and the flow channel, and the first fin (11) and the second fin (12) extend along the length direction (L) and a height direction (H) perpendicular to the extension plane of the base (1). The communicating part (14) comprises a first communicating part (141) communicating with the storage cavity and a second communicating part (142) connected between the first communicating part (141) and the flow channel, wherein the first communicating part (141) is offset from the second communicating part (142) in the length direction (L). The heat dissipation fin (2) is fixedly connected with the top of the base (1) via the first communicating part (141) and the connecting part (13). The communicating part (14) and the connecting part (13) are isolated from each other.

2. The phase change heat spreader of claim 1, wherein, The top of the base (1) has an opening communicating with the storage cavity, 3. The phase change heat spreader of claim 2, wherein, The first communicating part (141) comprises a bottom wall (1411) and an arc-shaped top wall (1412) surrounding the bottom wall (1411) to form an internal cavity, the center of the bottom wall (1411) has a center hole (1413) abutting the opening, and the diameter of the bottom wall (1411) is greater than the diameter of the center hole (1413).

4. The phase change heat spreader of claim 1, wherein, The first communicating part (141) is fixedly connected with the top of the base (1) via the bottom wall (1411). The communicating part (14) comprises a third communicating part (143) connected between the first communicating part (141) and the second communicating part (142), The third communicating part (143) extends along the length direction (L) and penetrates the arc-shaped top wall (1412) to communicate with the storage cavity via the internal cavity.

5. The phase change heat spreader of claim 4, wherein, The second communicating part (142) comprises a pair of arc-shaped arms (1421) respectively communicating with the flow channels of the first fin (11) and the second fin (12). The radius of the arc-shaped arm (1421) is greater than the radius of the connecting part (13) connected with the first fin (11) and the second fin (12).

6. The phase change heat spreader of claim 4, wherein, The radius of the arc-shaped arm (1421) is greater than 10 mm.

7. The phase change heat spreader of claim 6, wherein, The flow channels are distributed in the first fin (11) and the second fin (12), and the flow channels of the first fin (11) and the second fin (12) are only communicated via the second communicating part (142).

8. The phase change heat spreader of claim 6, wherein, ​ 9. The phase change heat spreader of claim 1, wherein, ​ 10. The phase change heat spreader of claim 1, wherein, The communication portion (14) is connected to one end of the bottom of the first tooth blade (11) and the second tooth blade (12) in the length direction.

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