CN115279111A - Liquid cooling plate and heat dissipation equipment - Google Patents

Abstract

The invention discloses a liquid-cooling plate and heat-dissipating equipment. The liquid-cooling plate includes an inlet and an outlet and a heat exchange flow channel connecting the inlet and the outlet. The heat exchange flow channel includes a plurality of channel units communicated in sequence. In the liquid flow direction of the channel, the flow cross-sectional areas of the at least two channel units decrease sequentially. During use, since the temperature of the cooling liquid from the inlet to the outlet gradually increases, and in this solution, at least two channel units with decreasing cross-sectional area of the flow are designed in the direction of the liquid flow. On the other hand, the flow rate of the cooling liquid per unit flow section in these channel units increases sequentially, so that the heat exchange capacity of these channel units tends to be consistent, and the temperature uniformity of the entire liquid-cooled radiator is improved. While meeting the junction temperature requirements of the equipment, the invention can control the temperature difference between the equipments within a small range to ensure the temperature uniformity of the system.

Description

Liquid cold plate and cooling equipment

technical field

The invention relates to the technical field of heat dissipation devices, in particular to a liquid cooling plate and heat dissipation equipment.

Background technique

The temperature of equipment components is one of the main factors affecting the performance and reliability of power electronic equipment. When the operating temperature exceeds a certain range, the performance of equipment components decreases with the increase of junction temperature, and the failure rate is exponentially related to its junction temperature. Even affect its service life when overheated. At the same time, for multiple power electronic devices in the same system, such as semiconductor lasers, IGBTs, etc., the temperature uniformity among devices will affect the stability and service life of the entire system. Therefore, it is necessary to control the temperature difference of the entire system to improve Temperature uniformity among devices is particularly important.

Air cooling is widely used in electronic heat dissipation due to its simple structure and relatively low energy consumption. Meet the heat dissipation requirements of high-power power electronic equipment. In contrast, liquid cooling has high thermal conductivity and specific heat capacity, strong heat dissipation capability, fast response speed, and high reliability, which can meet the heat dissipation requirements of high-power power electronic equipment, and has great market application potential. One of the mainstream cooling forms.

In order to achieve the excellent heat dissipation effect of liquid cooling, the basic requirements for liquid cooling radiators used in equipment such as laser transmitters are: (1) have high heat dissipation efficiency so as to take away excess heat in time to avoid overheating of equipment; 2) Accurate heat dissipation design is required to control the temperature difference to ensure temperature uniformity among devices. Therefore, how to simultaneously ensure the absolute heat dissipation capacity of the liquid cooling system and the temperature difference of electronic equipment within a reasonable and controllable range is a major research focus of current liquid cooling radiators.

At present, in practical applications, considering the processing technology and cost, the common flow channels of liquid cooling radiators are mainly serial serpentine channels, parallel cold and hot cross channels, and U-shaped channels. However, the flow channel form of the existing liquid cooling radiator is not conducive to controlling the temperature difference among various devices in the system.

Therefore, how to control the temperature difference between the various devices in the same system within a small range is a technical problem that those skilled in the art need to solve at present.

Contents of the invention

In view of this, the purpose of the present invention is to provide a liquid cold plate, which can control the temperature difference between each device in a small range while meeting the requirements of the junction temperature of the device, so as to ensure the uniformity of the temperature of the system. Another object of the present invention is to provide a heat dissipation device comprising the above-mentioned liquid cooling plate.

In order to achieve the above object, the present invention provides the following technical solutions:

A liquid cold plate, comprising an inlet and an outlet and a heat exchange channel connecting the inlet and the outlet, the heat exchange channel includes a plurality of sequentially connected channel units, and the liquid along the heat exchange channel In the flow direction, the flow cross-sectional areas of at least two of the channel units decrease sequentially.

Preferably, in the second to the last channel unit along the liquid flow direction of the heat exchange channel, the flow cross-sectional area of any one of the channel units is smaller than or equal to that of the upstream adjacent channel unit. flow cross-sectional area.

Preferably, each of said channel units comprises one sub-channel or a plurality of sub-channels arranged in parallel.

Preferably, the flow cross-sectional areas of each of the sub-channels are equal, and the number of the sub-channels of at least two of the channel units decreases sequentially in the liquid flow direction along the heat exchange channel.

Preferably, in the second to the last channel unit along the liquid flow direction of the heat exchange channel, the number of the sub-channels of any one of the channel units is less than or equal to the upstream adjacent channel The number of the sub-channels of the unit.

Preferably, partitions are arranged between adjacent sub-channels in the same channel unit.

Preferably, several heat exchange fins are arranged in the sub-channel.

Preferably, in the liquid flow direction along the heat exchange flow channel, the density of the heat exchange fins in at least two of the channel units increases sequentially.

Preferably, in the second to the last channel unit along the liquid flow direction of the heat exchange channel, the density of the heat exchange fins in any one of the channel units is greater than or equal to that of all adjacent upstream channels. The density of the heat exchange fins in the channel unit.

Preferably, at least one of the channel units is provided with an inlet diverging channel and an outlet converging channel, the inlet diverging channel communicates with the inlet of the sub-channel, and the outlet converging channel communicates with the outlet of the sub-channel.

Preferably, the inlet distribution channel is connected with a plurality of sub-channels, and the plurality of sub-channels are arranged in sequence along the direction away from the inlet of the inlet distribution channel, and the inlets of the plurality of sub-channels The flow cross-sectional area of the corresponding inlet distribution channel decreases sequentially along the arrangement direction of the plurality of sub-channels.

Preferably, the wall surface of the inlet branching channel on the inlet side away from the sub-channels gradually approaches the inlet side of the sub-channels along the arrangement direction of the plurality of sub-channels.

Preferably, the longitudinal section of the inlet distribution channel is trapezoidal or triangular.

Preferably, the flow cross-sectional area of the outlet confluence channel is consistent along the liquid flow direction.

The liquid cooling plate provided by the present invention includes an inlet and an outlet and a heat exchange channel connecting the inlet and the outlet. The heat exchange channel includes a plurality of sequentially connected channel units, and along the heat exchange channel In the direction of the liquid flow, the flow cross-sectional areas of at least two of the channel units decrease sequentially. When in use, since the temperature of the cooling liquid from the inlet to the outlet gradually increases, and in this solution, there are at least two channel units whose cross-sectional area decreases successively along the direction of the liquid flow. Therefore, in the direction of the liquid flow Above all, the flow rate of the cooling liquid per unit flow section in these channel units increases sequentially, so that the heat exchange capabilities of these channel units tend to be consistent, and the temperature uniformity of the entire liquid-cooled radiator is improved. The present invention can control the temperature difference among various devices in a small range while satisfying the junction temperature requirements of the devices, thereby ensuring the temperature uniformity of the system.

The present invention also provides a heat dissipation device including the above-mentioned liquid-cooled plate. The derivation process of the beneficial effect produced by the heat-dissipated device is similar to the derivation process of the beneficial effect brought by the above-mentioned liquid-cooled plate, so it will not be repeated here.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic diagram of the use state of the liquid cold plate in the specific embodiment of the present invention;

Fig. 2 is a schematic diagram of the bottom plate structure of the liquid-cooled plate in a specific embodiment of the present invention;

Fig. 3 is a top view of the bottom plate structure of the liquid cooling plate in a specific embodiment of the present invention.

The meanings of the reference signs in Fig. 1 to Fig. 3 are as follows:

1-heating equipment, 2-upper cover, 3-inlet, 4-outlet, 5-bottom plate, 6-heat exchange fin, 7-partition, 8-channel unit, 9-inlet diversion channel, 10-outlet confluence channel, 11-sub-channel.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figures 1 to 3, Figure 1 is a schematic diagram of the use state of the liquid cold plate in a specific embodiment of the present invention; Figure 2 is a schematic diagram of the bottom plate structure of the liquid cold plate in a specific embodiment of the present invention; Figure 3 is a specific embodiment of the present invention Top view of the bottom plate structure of the liquid cold plate in the embodiment.

The present invention provides a liquid cold plate, which includes an inlet 3 and an outlet 4 and a heat exchange channel connecting the inlet 3 and the outlet 4. The heat exchange channel includes a plurality of sequentially connected channel units 8, along the heat exchange channel In the direction of liquid flow, the flow cross-sectional areas of at least two channel units 8 decrease successively. It should be noted that, as shown in Fig. 1, the liquid cooling plate in the present invention specifically includes an upper cover plate 2 and a bottom plate 5, and the heat exchange flow channel may be composed of grooves processed on the upper cover plate 2 and/or bottom plate 5, Preferably, in this solution, a heat exchange channel is processed on the bottom plate 5, and then the upper cover plate 2 is sealed and covered on the bottom plate 5 to form a liquid cooling plate.

When in use, each heating device 1 is placed in contact with the surface of the liquid cooling plate. Since the temperature of the cooling liquid from the inlet 3 to the outlet 4 gradually increases, in this solution, the flow cross-sectional area is designed to decrease sequentially along the liquid flow direction. Small at least two channel units 8, therefore, in the liquid flow direction, the flow rate of the cooling liquid per unit flow section in these channel units 8 increases sequentially, so that the heat exchange capabilities of these channel units 8 tend to be consistent, Improved temperature uniformity across the liquid cooling radiator. The present invention can control the temperature difference between each heating device 1 in a small range while meeting the requirement of the junction temperature of the device, so as to ensure the temperature uniformity of the system.

Preferably, in the second to the last channel unit 8 along the liquid flow direction of the heat exchange channel, the flow cross-sectional area of any one channel unit 8 is smaller than or equal to the flow cross-sectional area of the upstream adjacent channel unit 8 . Such setting makes the flow cross-sectional area of each channel unit 8 on the entire liquid cooling plate gradually decrease along the liquid flow direction according to the preset law, so that the temperature difference between the various heating devices 1 on the liquid cooling plate is further reduced .

Preferably, each channel unit 8 comprises one sub-channel 11 or a plurality of sub-channels 11 arranged in parallel. With such arrangement, when the cooling liquid flows through the channel unit 8 , each sub-channel 11 can further guide and distribute the cooling liquid.

It should be noted that each of the sub-channels 11 in each channel unit 8 above or each sub-channel 11 of different channel units 8 can be designed as a structure with equal flow cross-sectional areas, or as a structure with unequal flow cross-sectional areas. . In a preferred solution, the flow cross-sectional areas of the sub-channels 11 are equal, and the number of the sub-channels 11 of at least two channel units 8 decreases sequentially in the liquid flow direction along the heat exchange channel. Specifically, in this solution, different design of flow cross-sectional areas of different channel units 8 is realized by designing channel units 8 with different numbers of sub-channels 11 .

Further preferably, in the second to last channel unit 8 along the liquid flow direction of the heat exchange channel, the number of sub-channels 11 of any channel unit 8 is less than or equal to the number of sub-channels 11 of the upstream adjacent channel unit 8. Number of channels 11. Such setting makes the flow cross-sectional area of each channel unit 8 on the entire liquid cooling plate gradually decrease along the liquid flow direction according to the preset law, so that the temperature difference between the various heating devices 1 on the liquid cooling plate is further reduced .

Preferably, partitions 7 are arranged between adjacent sub-channels 11 in the same channel unit 8 . Specifically, the partition part 7 can be designed as a partition structure or a partition block structure or the like. The lengths of the sub-channels 11 in the present invention can be equal or different, and the entire sub-channels 11 can be designed to extend along a straight line or a curve.

Further preferably, several heat exchange fins 6 are arranged in the sub-channel 11 . Specifically, the heat exchange fins 6 are arranged along the liquid flow direction, and the gaps between the heat exchange fins 6 form heat exchange gaps, which can further increase the heat exchange area in each sub-channel 11, thereby further improving the overall The heat transfer capacity of the liquid cold plate.

Preferably, in the direction of liquid flow along the heat exchange channel, the density of the heat exchange fins 6 in at least two channel units 8 increases sequentially. Wherein, the density of the heat exchanging fins 6 refers to the number of heat exchanging fins 6 in a unit flow section in the channel unit 8 . Since the temperature of the cooling liquid will gradually increase after heat exchange in several upstream channel units 8, in order to ensure that the downstream channel units 8 also have sufficient heat exchange capacity, this scheme is designed to ensure that the liquid flow along the heat exchange channel direction, the density of heat exchange fins in the downstream channel unit 8 is increased, thereby enhancing the heat transfer coefficient of the downstream channel unit 8, improving the heat dissipation capacity, and improving the temperature uniformity of the entire liquid cold plate.

Preferably, in the second to the last channel unit 8 along the liquid flow direction of the heat exchange channel, the density of the heat exchange fins 6 in any channel unit 8 is greater than or equal to that in the upstream adjacent channel unit 8 The density of heat exchange fins 6. Such setting makes the density of the heat exchange fins 6 of each channel unit 8 on the entire liquid cold plate gradually increase along the liquid flow direction according to a preset rule, thereby further improving the temperature uniformity of the entire liquid cold plate, so that The temperature difference among the heating devices 1 on the liquid cooling plate is further reduced.

Preferably, at least one channel unit 8 is provided with an inlet split channel 9 and an outlet confluence channel 10 , the inlet split channel 9 communicates with the inlet of the sub-channel 11 , and the outlet confluence channel 10 communicates with the outlet of the sub-channel 11 . Specifically, for the channel unit 8 with a plurality of parallel sub-channels 11, or the channel unit 8 with only one sub-channel 11 and the size of the inlet and outlet of the sub-channel 11 is relatively large, the cooling liquid is supplied by the upstream When the channel unit 8 flows into the channel unit 8, it can be distributed into each sub-channel 11 or into each position of a single sub-channel 11 by means of the inlet branch channel 9. Correspondingly, after the cooling liquid flows through the channel unit 8, the outlet can be used to The confluence channel 10 is converged so as to flow into the next adjacent channel unit 8 .

Preferably, the inlet split channel 9 is connected with a plurality of sub-channels 11, and the plurality of sub-channels 11 are arranged in sequence along the direction away from the entrance of the inlet split channel 9, and the inlets of the plurality of sub-channels 11 correspond to the passages of the inlet split channel 9. The cross-sectional area of the flow decreases sequentially along the arrangement direction of the plurality of sub-channels 11 . With such an arrangement, the cooling liquid can enter each sub-channel 11 at the same time by using the inlet diversion channel 9 with a gradually reduced cross-section, and at the same time ensure that the flow rate in each sub-channel 11 is consistent, so as to achieve uniform flow distribution and effectively control the correspondence of each sub-channel 11 in parallel. equipment temperature difference.

Preferably, the wall surface on the inlet side of the back ion channel 11 of the inlet splitting channel 9 gradually approaches the inlet side of the subchannels 11 along the arrangement direction of the plurality of subchannels 11 . Specifically, in this solution, the inlets of each sub-channel 11 can be arranged flush, and the wall surface on the inlet side of the back ion channel 11 of the inlet shunt channel 9 is designed to be gradually approached along the arrangement direction of the multiple sub-channels 11. The inlet side of the sub-channel 11 is inclined; in this scheme, the wall surface on the inlet side of the back ion channel 11 of the inlet shunt channel 9 can also be designed as a straight-sided wall surface parallel to the side of the liquid cooling plate. The inlet is designed to gradually incline towards the above-mentioned straight wall surface along the arrangement direction of the plurality of sub-channels 11 . In this solution, through the above-mentioned structural design, the cross-sectional width of the inlet distribution channel 9 can be gradually reduced along the arrangement direction of the multiple sub-channels 11 , thereby achieving the purpose of evenly distributing the cooling liquid to the multiple sub-channels 11 .

Preferably, the longitudinal section of the inlet distribution channel 9 is trapezoidal or triangular, as shown in FIG. 2 and FIG. 3 . Of course, the present invention can also design the wall surface on the inlet side of the back ion channel 11 of the inlet shunting channel 9 as an arc surface structure, so that the longitudinal section of the inlet shunting channel 9 can be arcuate or other irregular shapes, which are not described herein. Let me repeat.

It should be noted that the present invention can also design the inlet shunt channel 9 into other structural shapes, for example, as shown in Figure 2 and Figure 3, the heat exchange flow channel designed on the liquid cooling plate includes two rows of upper and lower flow channel parts, the liquid The communication structure of the two channel units 8 on the far right side of the cold plate is the junction of two rows of flow channel parts. Since the inlet of the right channel unit 8 located in the lower row is opposite to the outlet of the right channel unit 8 located in the upper row , therefore, the flow of cooling liquid between the two channel units 8 is unobstructed, and there is no need for a split channel to divide the flow to balance the flow of each sub-channel 11. Therefore, the inlet split channel 9 of the channel unit 8 located at the right end of the lower row has no Designed as a trapezoidal or triangular configuration as described above.

Preferably, the flow cross-sectional area of the outlet confluence channel 10 is consistent along the liquid flow direction. Specifically, the outlet confluence channel 10 can be designed as a channel structure with a rectangular longitudinal section, that is, the distance between the wall surface on the exit side of the back ion channel 11 of the outlet confluence channel 10 and the outlets of each sub-channel 11 is consistent, as Figure 3 shows.

It should be noted that the liquid cold plate provided by the present invention can design the position of the inlet and outlet according to the quantity of heating equipment and the flow rate of the coolant, for example, the inlet 3 and the outlet 4 are located on the same side of the liquid cold plate (as shown in Figure 1 shown), or the inlet 3 and the outlet 4 are respectively located on adjacent two sides of the liquid cooling plate, or the inlet 3 and the outlet 4 are respectively located on opposite sides of the liquid cooling plate.

The present invention also provides a heat dissipation device including the above-mentioned liquid-cooled plate. The derivation process of the beneficial effect produced by the heat-dissipated device is similar to the derivation process of the beneficial effect brought by the above-mentioned liquid-cooled plate, so it will not be repeated here.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. The utility model provides a liquid cooling plate, includes import and export and intercommunication the import with the heat transfer runner of export, its characterized in that, the heat transfer runner includes a plurality of channel unit that communicate in proper order, follows in the liquid flow direction of heat transfer runner, at least two channel unit's through-flow cross sectional area reduces in proper order.

2. The liquid-cooled plate of claim 1, wherein the flow cross-sectional area of any one of the channel units in the second to last channel units in the flow direction of the heat exchange flow path is equal to or smaller than the flow cross-sectional area of the upstream adjacent channel unit.

3. A liquid-cooled plate according to claim 1 or 2, characterized in that each of said channel units comprises one sub-channel or a plurality of sub-channels arranged in parallel.

4. A liquid-cooled panel according to claim 3, wherein the flow cross-sectional area of each of the sub-channels is equal, and the number of sub-channels of at least two of the channel units decreases in the direction of flow along the heat exchange flow channel.

5. The liquid-cooled plate of claim 4, wherein the number of the sub-channels of any one of the channel units is equal to or less than the number of the sub-channels of the upstream adjacent channel unit in the second to last channel unit in the flow direction of the heat exchange flow channel.

6. The liquid cooling panel of claim 3, wherein a partition is disposed between adjacent sub-channels within the same channel unit.

7. The liquid cooling plate of claim 3, wherein a plurality of heat exchanging fins are provided in the sub-channels.

8. The liquid cooling plate of claim 7, wherein the density of the heat exchange fins in at least two of the channel units increases sequentially in a liquid flow direction along the heat exchange flow channel.

9. The liquid cooling plate as claimed in claim 8, wherein the density of the heat exchange fins in any one of the channel units is equal to or greater than the density of the heat exchange fins in the upstream adjacent channel unit in the second to last channel units in the flow direction of the heat exchange flow channel.

10. The liquid-cooled panel of claim 3, wherein at least one of the channel units is provided with an inlet branch channel communicating with the inlet of the sub-channel and an outlet confluence channel communicating with the outlet of the sub-channel.

11. The liquid-cooled plate of claim 10, wherein the inlet manifold channel is in communication with a plurality of the sub-channels, the plurality of sub-channels are sequentially arranged in a direction away from the inlet of the inlet manifold channel, and the flow cross-sectional areas of the inlet manifold channel at the inlets of the plurality of sub-channels decrease sequentially in the direction along the arrangement of the plurality of sub-channels.

12. The liquid cooled plate of claim 11, wherein a wall surface of the inlet manifold facing away from the inlet side of the sub-passages is gradually closer to the inlet side of the sub-passages in the direction of the arrangement of the plurality of sub-passages.

13. The liquid cooled plate of claim 12 wherein the inlet manifold has a trapezoidal or triangular longitudinal cross-section.

14. The liquid cooled plate of claim 10, wherein the flow cross-sectional area of the outlet manifold is uniform in the direction of liquid flow.

15. A heat sink apparatus comprising a liquid cooled plate as claimed in any one of claims 1 to 14.

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