TWI863451B - Liquid-cooling heat sink - Google Patents

Abstract

A liquid-cooling heat sink having a base plate, a fin assembly, a cover and a flow-distributing member is provided. The fin assembly is arranged on the base plate and has a plurality of channels parallel to each other. Each channel has an inlet and an outlet opposite to each other. The cover is arranged on the base plate and covers each inlet, the cover has a liquid inlet port and with the base plate form a chamber between the liquid inlet port and each inlet. The flow-distributing member is arranged on outside of the cover and located between the liquid inlet port and the chamber. The flow-distributing member has a plurality of branch channels. The liquid inlet port is connected to the chamber and each inlet via each branch channel. The liquid-cooling heat sink is therefore increasing a number of the fins in an existing space, making a dielectric liquid to evenly flow into each channel to improve the heat dissipation efficiency.

Description

Liquid cooling radiator

The present invention relates to a heat sink, in particular to a liquid cooling heat sink used in an immersion liquid cooling system and capable of improving heat dissipation efficiency.

The immersion liquid cooling system immerses the heat generating components in electronic devices (such as servers) in a dielectric fluid (i.e., non-conductive liquid) in a sealed chassis, and uses the liquid properties of the dielectric fluid to remove the heat generated by the heat generating components. The general immersion liquid cooling system is mainly divided into single-phase and dual-phase. The single-phase system uses a pump to drive the dielectric fluid to circulate and cooperate with a hot-cold exchanger to achieve a heat dissipation effect, while the dual-phase system uses a low-boiling-point dielectric fluid with a condenser to continuously produce phase changes in the dielectric fluid to achieve a heat dissipation effect.

Common immersion liquid cooling systems, whether single-phase or dual-phase, usually install a heat sink with multiple fins on the heat generating element to quickly transfer the heat energy generated by the heat generating element to each fin to cool the dielectric fluid. However, due to the limited spacing between the fins and the certain viscosity of the dielectric fluid, the fluidity of the dielectric fluid between the fins of the heat sink is often poor, which greatly reduces the heat dissipation efficiency of the entire liquid cooling system.

Therefore, how to effectively improve the fluidity of the dielectric fluid between the fin bodies of the heat sink, and at the same time reduce the distance between the fin bodies in the existing space to increase the number of fin bodies, thereby greatly increasing the heat dissipation efficiency of the heat sink is a shortcoming that needs to be improved. In view of this, the inventor has focused on the above-mentioned shortcomings of the existing technology, and has made dedicated research and applied theory to try his best to solve the above-mentioned problems, which has become the goal of the inventor's improvement.

The main purpose of the present invention is to increase the number of fin bodies of the fin assembly within the existing space, while allowing the dielectric fluid flowing into the liquid interface to flow evenly into each channel, thereby effectively increasing the heat dissipation efficiency.

In order to achieve the above-mentioned purpose, the present invention provides a liquid cooling heat sink, including a substrate, a fin assembly, a cover and a diverter member. The fin assembly is arranged on the substrate, the fin assembly has a plurality of channels, each channel is parallel to each other, each channel has an inlet and an outlet opposite to each other, the cover is arranged on the substrate and covers each inlet, the cover has a liquid inlet interface, the cover and the substrate together form a chamber, the chamber is located between the liquid inlet interface and each inlet, the diverter member is arranged on the outer side of the cover and between the liquid inlet interface and the chamber, the diverter member has a plurality of branch channels, and the liquid inlet interface is connected to the chamber and each inlet through each branch channel.

In one embodiment of the present invention, the flow diversion component includes a tube body and a plurality of partition walls. The tube body gradually extends from the liquid inlet port toward the chamber, and each partition wall is arranged in the tube body to separate each branch channel.

In one embodiment of the present invention, each partition wall is formed with a flow guiding slope on the side facing the liquid inlet port.

In one embodiment of the present invention, the fin assembly includes a plurality of fin bodies, and the volume of each branch channel is positively correlated with the number of the corresponding fin bodies.

The liquid cooling heat sink of the present invention sets the flow dividing member on the housing so that the liquid inlet interface can be connected with the chamber and the entrance of each channel through each branch channel, so that the width of the channel can be reduced in the existing space to increase the number of fin bodies of the fin assembly, and at the same time, the dielectric liquid flowing into the liquid inlet interface can flow into each channel evenly through each branch channel, thereby effectively increasing the heat dissipation efficiency of the liquid cooling heat sink.

10: Substrate

11: Mounting surface

20: Fin assembly

21: Channel

211:Entrance

212:Exit

22: Fin body

30: Shell

31: Liquid inlet interface

32: Chamber

40: Diversion components

41: Divergent Roads

42: Connecting plate

43: Baffle

44: diversion slope

45: protrusion

46: Recessed part

47: Tube body

48: Partition wall

A: Dielectric fluid

B:Heating element

C: Hose

Figure 1 is a three-dimensional external view of the first embodiment of the present invention.

Figure 2 is a three-dimensional external view of the first embodiment of the present invention from another viewing angle.

Figure 3 is a three-dimensional external view of the diversion component of the first embodiment of the present invention.

Figure 4 is a cross-sectional top view of the first embodiment of the present invention.

Figure 5 is a cross-sectional side view of the first embodiment of the present invention.

Figure 6 is a cross-sectional side view of the first embodiment of the present invention in use.

Figure 7 is a three-dimensional external view of the second embodiment of the present invention.

Figure 8 is a three-dimensional external view of the diversion component of the second embodiment of the present invention.

Figure 9 is a cross-sectional top view of the second embodiment of the present invention.

Figure 10 is a cross-sectional side view of the second embodiment of the present invention.

Figure 11 is a three-dimensional external view of the third embodiment of the present invention.

Figure 12 is a three-dimensional external view from another angle of the third embodiment of the present invention.

Figure 13 is a cross-sectional view of the diversion component of the third embodiment of the present invention.

Figure 14 is a cross-sectional top view of the third embodiment of the present invention.

In the description of the present invention, it should be understood that the terms "front side", "rear side", "left side", "right side", "front end", "rear end", "end", "longitudinal", "lateral", "vertical", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limiting condition of the present invention.

The detailed description and technical contents of the present invention will be described below with accompanying drawings. However, the attached drawings are for illustrative purposes only and are not intended to limit the present invention.

The present invention provides a liquid cooling heat sink for use in an immersion liquid cooling system and attached to a heat generating element B immersed in a dielectric fluid A, so as to exchange the heat energy generated by the heat generating element B with the dielectric fluid A to achieve a heat dissipation effect. Please refer to Figures 1 to 5, which are the first embodiment of the liquid cooling heat sink of the present invention, which includes a substrate 10, a fin assembly 20, a housing 30 and a diversion member 40.

The substrate 10 is made of a material with good thermal conductivity, such as aluminum, copper, gold, tungsten, etc. or alloys of the aforementioned metals, but not limited to the above. In this embodiment, the substrate 10 is in the shape of a rectangular plate, but the shape of the substrate 10 can be adjusted accordingly according to the external dimensions of the heating element B or other requirements, so the present invention does not impose many restrictions on this. The substrate 10 has a relative attachment surface (not numbered in the figure) and a mounting surface 11. The attachment surface is used to attach to the heating element B, so that the substrate 10 can quickly absorb the heat energy generated by the heating element B through the attachment surface.

The fin assembly 20 is disposed on the mounting surface 11 of the substrate 10. The fin assembly 20 is made of a material with good thermal conductivity, such as aluminum, copper, gold, tungsten, etc. or alloys of the aforementioned metals, but not limited to the above. The fin assembly 20 has a plurality of channels 21. The channels 21 are arranged parallel to each other, and each channel 21 has an inlet 211 and an outlet 212 opposite to each other. In this embodiment, the fin assembly 20 includes a plurality of fin bodies 22 that are stamped and formed into a "[" shape, and each fin body 22 is welded and fixed in sequence side by side in the same direction to form the fin assembly 20. However, the fin assembly 20 of the present invention is not limited to the above, and the shape and fixing method of each fin body 22 can still have many other embodiments, which are well known to those with ordinary knowledge in the field and are not the technical focus of the present invention, so they are not elaborated here, but the shape, number, arrangement and combination method of each fin body 22 in the fin assembly 20 should not be used to limit the present invention.

The housing 30 is disposed on the mounting surface 11 of the substrate 10 and at least covers the inlets 211 of the fin assembly 20. Therefore, the housing 30 can of course also cover the entire fin assembly 20. In this embodiment, the housing 30 is preferably made of metal, but can also be made of plastic or other materials. A liquid inlet port 31 is provided on the front side of the housing 30. The liquid inlet port 31 is generally in the shape of a hollow tube, so as to be connected to a hose C of a pump (not shown), as shown in FIG6 . The liquid inlet port 31 can be integrally formed with the housing 30, or can be fixedly combined with the housing 30 by a two-piece assembly. The inner side of the housing 30 and the mounting surface 11 of the substrate 10 together form a chamber 32, and the chamber 32 is located between the liquid inlet interface 31 and each inlet 211.

The flow dividing member 40 is disposed on the housing 30 . The specific configuration will be described later, so it is not described here in detail. The flow dividing member 40 has a plurality of branch channels 41 . The liquid inlet port 31 is connected to the chamber 32 and each inlet 211 through each branch channel 41 . As shown in FIG. 6 , the soft tube C is directly connected to the liquid inlet port 31, so that the dielectric liquid A driven by the pump and input from the soft tube C to the liquid inlet port 31 can be diverted from each branch channel 41 to the chamber 32 and flow into the fin assembly 20 through each inlet 211, thereby evenly passing through each channel 21 of the fin assembly 20, thereby forcing the dielectric liquid A to flow through each fin body 22 and perform heat exchange to achieve a good heat dissipation effect, and can reduce the distance between each fin body 22 under the existing space of the liquid cooling radiator, while increasing the number of fin bodies 22 to improve the heat dissipation efficiency.

To further explain, referring to FIGS. 1 to 5 again, the flow dividing member 40 in this embodiment is disposed on the inner side of the housing 30 and is accommodated in the chamber 32. Specifically, the flow dividing member 40 in this embodiment is welded to the inner side of the housing 30 and includes a connecting plate 42 and a plurality of baffles 43. The connecting plate 42 is generally fan-shaped. Each baffle 43 is vertically connected to the bottom surface of the connecting plate 42, and each baffle 43 is radially arranged from the liquid inlet port 31 toward the fin assembly 20. In this embodiment, the number of baffles 43 is six and the connecting plate 42 is divided into six pieces for easy production and manufacturing, and the diversion component 40 is formed by welding and fixing, but the present invention is not limited to this. For example, the diversion component 40 can also be formed as a whole or split into other shapes and then combined and fixed together after production and manufacturing.

Referring again to FIG. 4 , some of the baffles 43 are formed with a flow guiding slope 44 on the side facing the liquid inlet interface 31, and each flow guiding slope 44 is disposed toward the central axis of the liquid inlet interface 31. Specifically, each flow guiding slope 44 in this embodiment is disposed on the two outermost baffles 43 and the two innermost baffles 43, respectively, so as to increase the caliber size at the inlet 211 of the branch channels 41, thereby preventing the dielectric liquid A from flowing from the liquid inlet interface 31 into each branch channel 41 due to excessive resistance and affecting the flow rate, and at the same time, it can also play a role in guiding the dielectric liquid A to flow smoothly.

It should be noted that in this embodiment, the volume of each branch channel 41 is positively correlated with the number of the fin bodies 22 corresponding thereto. Specifically, since each branch channel 41 is surrounded by two baffles 43 and a connecting plate 42, and the number of fin bodies 22 of the liquid cooling radiator and the size of the flow dividing member 40 are fixed, the ratio of the volume size of any branch channel 41 to the total volume of all branch channels 41 must be the same or similar to the ratio of the number of fin bodies 22 corresponding to the branch channel 41 to the number of all fin bodies 22, that is, the larger the angle formed by the two baffles 43 of any branch channel 41, the greater the number of fin bodies 22 corresponding to it, so as to ensure that the dielectric fluid A can flow evenly into each channel 21 of the fin assembly 20 after being diverted by the flow dividing member 40.

Please refer to Figures 7 to 10, which are the second embodiment of the present invention. The main difference between the second embodiment and the first embodiment is the specific structure of the diverter member 40, so the same parts will not be repeated, and the differences are described in detail as follows.

The flow-dividing member 40 in this embodiment is formed by bending in one piece and includes a plurality of protrusions 45 and a plurality of recesses 46. The protrusions 45 and the recesses 46 are arranged alternately and roughly in a wave shape. And each branch channel 41 is formed by each protrusion 45 and each recess 46, that is, each branch channel 41 in this embodiment is formed from left to right in sequence, one up and one down, above or below the flow-dividing member 40. Each protrusion 45 gradually extends from the liquid inlet interface 31 toward the fin assembly 20, and each recess 46 gradually extends from the liquid inlet interface 31 toward the fin assembly 20, so that the flow-dividing member 40 is roughly trapezoidal in a top view, as shown in FIG. 10.

Thus, since the branch channels 41 of this embodiment are located at the upper and lower sides of the diversion member 40, the number of branch channels 41 can be increased compared to the first embodiment of the present invention, thereby further enhancing the diversion effect. It should be understood that the number of branch channels 41 in each figure of the present invention is only used as an example to facilitate the understanding and implementation of those with ordinary knowledge in the field, and is not used to limit the present invention.

In addition, in this embodiment, the volume of each branch channel 41 is also positively correlated with the number of the fin bodies 22 corresponding thereto. Specifically, since each branch channel 41 is formed by a protrusion 45 or a recess 46, and when the number of fin bodies 22 of the liquid cooling radiator and the size of the flow dividing member 40 are fixed, the ratio of the volume size of any branch channel 41 to the total volume of all branch channels 41 must be the same or similar to the ratio of the number of fin bodies 22 corresponding to the branch channel 41 to the number of all fin bodies 22, that is, the larger the angle formed by the protrusion 45 or the recess 46 of any branch channel 41, the greater the number of fin bodies 22 corresponding to it, so as to ensure that the dielectric fluid A can flow evenly into each channel 21 of the fin assembly 20 after being diverted by the flow dividing member 40.

Please refer to Figures 11 to 14, which are the third embodiment of the present invention. The main difference between the third embodiment and the first embodiment is the location and specific structure of the diverter member 40, so the same parts will not be repeated, and the differences are described in detail as follows.

The flow dividing member 40 in this embodiment is disposed on the outer side of the housing 30 and is located between the liquid inlet port 31 and the chamber 32. Specifically, the flow dividing member 40 in this embodiment is welded to the outer side of the housing 30 and includes a tube 47 and a plurality of partition walls 48. The tube 47 gradually extends from the liquid inlet port 31 toward the chamber 32 and is generally in a trapezoidal shape. Each partition wall 48 is disposed inside the tube 47 to separate the internal space of the tube 47 into each branch channel 41. In this embodiment, the flow-dividing component 40 and the liquid inlet interface 31 are first integrally formed by plastic injection or metal die-casting and then installed on the housing 30, but the present invention is not limited thereto. For example, the flow-dividing component 40, the liquid inlet interface 31 and the housing 30 can also be directly integrally formed by plastic injection or metal die-casting, or the flow-dividing component 40 and the housing 30 are first integrally formed by plastic injection or metal die-casting and then the liquid inlet interface 31 is installed on the front end of the flow-dividing component 40.

Thus, since the flow-dividing member 40 of this embodiment is directly connected between the liquid inlet interface 31 and the chamber 32, it is ensured that the dielectric liquid A flowing into the liquid inlet interface 31 can be completely diverted by the flow-dividing member 40, thereby entering the chamber 32 and entering each inlet 211, effectively achieving a better diversion effect than the first embodiment.

Furthermore, referring to FIG. 13 and FIG. 14 again, each partition wall 48 in this embodiment is formed with a flow guiding slope 44 on one side facing the liquid inlet interface 31, and each flow guiding slope 44 is arranged toward the central axis of the liquid inlet interface 31. In this way, the diameter of the inlet 211 of each branch channel 41 can be increased, thereby preventing the flow rate of the dielectric liquid A from being affected by excessive resistance when it flows from the liquid inlet interface 31 into each branch channel 41, and at the same time, it can also play a role in guiding the dielectric liquid A to flow smoothly.

In addition, in this embodiment, the volume of each branch channel 41 is also positively correlated with the number of the fin bodies 22 corresponding thereto. Specifically, since each branch channel 41 is formed by a tube 47 and at least one partition wall 48, and the number of fin bodies 22 of the liquid cooling radiator and the size of the flow dividing member 40 are fixed, the ratio of the volume size of any branch channel 41 to the total volume of all branch channels 41 must be the same or similar to the ratio of the number of fin bodies 22 corresponding to the branch channel 41 to the number of all fin bodies 22, that is, the larger the volume of any branch channel 41, the greater the number of fin bodies 22 corresponding to it, so as to ensure that the dielectric fluid A can flow evenly into each channel 21 of the fin assembly 20 after being diverted by the flow dividing member 40.

The liquid cooling heat sink of the present invention sets the flow dividing member 40 on the housing 30, so that the liquid inlet interface 31 can be connected with the chamber 32 and the inlet 211 of each channel 21 through each branch channel 41, thereby reducing the width of the channel 21 in the existing space and increasing the number of fin bodies 22 of the fin assembly 20. At the same time, the dielectric liquid A flowing into the liquid inlet interface 31 can flow into each channel 21 evenly through each branch channel 41, thereby effectively increasing the heat dissipation efficiency of the liquid cooling heat sink.

In summary, the present invention has industrial applicability, novelty and advancement. The present invention may have other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may evolve various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the patent applied for the present invention.

10: Substrate

11: Mounting surface

20: Fin assembly

21: Channel

211:Entrance

22: Fin body

30: Shell

31: Liquid inlet interface

32: Chamber

40: Diversion components

41: Divergent Roads

Claims (4)

A liquid cooling heat sink comprises: a substrate; a fin assembly disposed on the substrate, the fin assembly having a plurality of channels, each of the channels being parallel to each other, and each of the channels having an inlet and an outlet opposite to each other; a housing disposed on the substrate and covering each of the inlets, the housing having a liquid inlet interface, the housing and the substrate jointly forming a chamber, the chamber being located between the liquid inlet interface and each of the inlets; and a flow dividing member disposed on the outer side of the housing and between the liquid inlet interface and the chamber, the flow dividing member having a plurality of branch channels, the liquid inlet interface being connected to the chamber and each of the inlets via each of the branch channels. The liquid cooling heat sink as described in claim 1, wherein the flow diversion component includes a tube body and a plurality of partition walls, the tube body gradually extends from the liquid inlet port toward the chamber, and each of the partition walls is disposed in the tube body to separate each of the branch channels. The liquid cooling radiator as described in claim 2, wherein each of the partition walls is formed with a flow guiding slope on the side facing the liquid inlet port. The liquid cooling heat sink as described in claim 1, wherein the fin assembly includes a plurality of fin bodies, and the volume of each branch channel is positively correlated with the number of the corresponding fin bodies.