A liquid cooling plate with a high-efficiency heat dissipation structure

Abstract

This invention relates to the field of liquid cooling plate devices, and more particularly to a liquid cooling plate with a high-efficiency heat dissipation structure. The plate includes a liquid cooling plate body and a cooling flow tube forming a cooling medium channel within it, arranged in a meandering, bow-shaped structure. The straight section of the cooling flow tube is equipped with an adaptive turbulence structure that dynamically turbulents the coolant. High-temperature and low-temperature zones are formed in the middle and on both sides of the cooling flow tube, respectively. The adaptive turbulence structure includes bimetallic strips equidistantly arranged vertically along the straight section of the cooling flow tube, with one end of each bimetallic strip fixedly connected to the cooling flow tube. This invention can automatically change the flow channel morphology and turbulence intensity according to the component's heat dissipation temperature, achieving a dynamic balance between low-temperature, low-resistance, energy-saving, and high-temperature, high-turbulence, high-efficiency operation. Simultaneously, it precisely matches the heat dissipation of the high-temperature zone, prevents flow channel blockage, and enhances heat exchange uniformity, truly achieving dynamic adaptive turbulence adjustment. This effectively solves the problem of the inability to simultaneously balance heat dissipation and energy consumption in a fixed turbulence structure.

Description

Technical Field

[0001] This invention relates to the field of liquid cooling plate technology, and in particular to a liquid cooling plate with a high-efficiency heat dissipation structure. Background Technology

[0002] Power electronic devices generate a large amount of heat during long-term high-frequency operation, requiring liquid cooling plates for forced heat exchange and cooling to ensure the stability and lifespan of the devices. To improve the heat exchange efficiency of the cooling plate and enhance the heat dissipation of electronic devices, a turbulence structure is usually designed inside the liquid cooling plate to cut, block, and reverse the coolant, breaking the laminar flow state against the wall, promoting full mixing of hot and cold fluids, significantly improving the convective heat transfer coefficient, and enhancing heat exchange efficiency.

[0003] Because the load conditions of power electronic devices fluctuate greatly, they frequently experience extreme operating states of light load at low temperatures and heavy load at high temperatures. When the device is operating under light load, with low overall heat generation and low internal temperature of the cooling medium, the existing fixed turbulence structure still maintains a high degree of obstruction and turbulence. As the cooling water flows through the channel, the flow cross-section is continuously compressed, and the fluid flow resistance increases significantly. This continuously increases ineffective energy consumption, causing the overall pressure drop of the system's water circulation pipeline to rise. The water circulation pump needs to maintain high power operation to ensure flow supply, and ineffective energy consumption continues to increase, resulting in high overall energy consumption of the equipment. Long-term use leads to serious energy waste, and it is difficult to adjust the cooling medium autonomously according to the actual heat generation power and real-time temperature of the device. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a liquid cooling plate with a high-efficiency heat dissipation structure. This solves the technical problem that existing technologies cannot autonomously adjust the cooling medium according to the actual heat generation power and real-time temperature of the device, thus achieving true dynamic adjustment and effectively solving the problem that heat dissipation and energy consumption cannot be balanced by fixed turbulence structures.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a liquid cooling plate with a high-efficiency heat dissipation structure, including a liquid cooling plate body and a cooling flow pipe disposed therein to form a cooling medium channel and having a meandering bow-shaped structure. The straight section of the cooling flow pipe is provided with an adaptive turbulence structure for dynamically turbulenting the coolant. A high-temperature zone and a low-temperature zone are formed in the middle and on both sides of the cooling flow pipe, respectively. The adaptive turbulence structure includes bimetallic sheets arranged vertically and equidistantly along the straight section of the cooling pipe. One end of the bimetallic sheet is fixedly connected to the cooling pipe, and the other end is a free bending end. The bimetallic sheet includes iron and copper sheets that are compositely bonded and fixed. The iron and copper sheets of two adjacent bimetallic sheets are installed in opposite positions. At the same temperature, the bending directions of two adjacent bimetallic sheets are opposite, forming a wavy flow channel.

[0006] Preferably, the cooling pipe has a rectangular cross-section, and a gasket is fixed on the inner wall of the cooling pipe at the position corresponding to the bent end of the bimetallic strip to limit its bending range and form a flow channel.

[0007] Preferably, the copper sheets of two adjacent bimetallic strips are respectively attached to the inner wall of the cooling flow tube.

[0008] Preferably, the length of the bimetallic strip in the high-temperature zone of the cooling pipe is greater than the length of the bimetallic strip in the low-temperature zone, and the distance between two adjacent bimetallic strips in the high-temperature zone is less than the distance between two adjacent bimetallic strips in the low-temperature zone.

[0009] Preferably, the liquid cooling plate body includes a flow channel plate with a downwardly recessed center, and a cooling plate is provided at the top of the flow channel plate. Both the cooling plate and the flow channel plate are made of composite materials, which are stretched into a box shape and then brazed, and fixed by a number of sealing rivet nuts.

[0010] Preferably, the outer wall of the flow channel plate is fixed with an inlet pipe and an outlet pipe, which are respectively connected to the two ends of the cooling flow pipe.

[0011] Preferably, the cooling plate is provided with a preheating recovery structure, which includes a temperature difference slot inside the cooling plate. The temperature difference slot is arranged along the arc-shaped extension direction of the cooling pipe, and a thermoelectric generator is embedded inside the temperature difference slot in the same extension direction as the temperature difference slot.

[0012] By employing the above technical solution, the present invention provides a liquid cooling plate with a high-efficiency heat dissipation structure, which has at least the following beneficial effects: 1. This invention, by setting an adaptive turbulence structure and using a bimetallic strip composed of copper and iron sheets, utilizes the thermal expansion difference between copper and iron. When the temperature rises, the bimetallic strip bends more, the flow channel narrows, the turbulence is enhanced, and the heat exchange efficiency is improved. When the temperature drops, the bend decreases, the flow channel widens, the resistance decreases, and the water pump energy consumption is reduced. This achieves intelligent adjustment of large opening at low temperatures and small opening at high temperatures. It can automatically change the flow channel shape and turbulence intensity according to the temperature, achieving a dynamic balance of low temperature, low resistance, and energy saving, and high temperature, strong turbulence, and high efficiency. At the same time, it accurately matches the heat dissipation of the high temperature zone, prevents flow channel blockage, and enhances heat exchange uniformity, truly achieving dynamic adjustment and effectively solving the problem that heat dissipation and energy consumption cannot be balanced by a fixed turbulence structure.

[0013] 2. By placing gaskets at both ends of the bent end of the bimetallic strip, the present invention can provide local support for the bent end of the bimetallic strip, effectively limiting the maximum bending range of the bimetallic strip, preventing the free end of the bimetallic strip from sticking to the inner wall of the cooling flow tube and blocking the flow channel due to excessive bending, ensuring smooth circulation of the cooling medium, and buffering the stress when the bimetallic strip is bent, thus extending the service life of the bimetallic strip.

[0014] 3. This invention incorporates temperature difference slots within the cooling plate, into which continuous bow-shaped thermoelectric generators are embedded. The top of each thermoelectric generator is attached to the heating element, and the bottom is attached to the cooling pipe. The temperature difference between the two ends converts waste heat into a small amount of electrical energy. Simultaneously, this electrical energy can be transferred to the water pump, providing auxiliary power and reducing external energy consumption. This structure achieves waste heat recovery and reuse, effectively solving the problems of low waste heat utilization and severe energy waste in existing liquid-cooled plates, thus improving the energy efficiency of liquid-cooled plates. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0016] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the flow channel plate of the present invention; Figure 3 This is a side sectional view of the cooling plate of the present invention; Figure 4 This is a cross-sectional view of the top of the cooling plate of the present invention; Figure 5 This is a high and low temperature distribution diagram of the cooling flow tube of the present invention; Figure 6 This is a schematic diagram showing the installation position of the bimetallic strip in this invention; Figure 7 This is a schematic diagram of the structure of the bimetallic sheet of the present invention after being heated; Figure 8 This is a schematic diagram of the coolant flow direction after the bimetallic strip of the present invention is heated and opened; Figure 9 This is a schematic diagram of the cross-section of the cooling pipe of the present invention; Figure 10 This is a schematic diagram of the bimetallic sheet structure of the present invention.

[0017] In the diagram: 1. Liquid cooling plate body; 11. Flow channel plate; 12. Cooling plate; 13. Sealing rivet nut; 2. Cooling flow pipe; 21. Water inlet pipe; 22. Water outlet pipe; 3. Adaptive turbulence structure; 31. Bimetallic strip; 311. Iron sheet; 312. Copper sheet; 32. Gasket; 4. Preheating recovery structure; 41. Thermoelectric slot; 42. Thermoelectric generator. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 To address the shortcomings of existing technologies, this invention provides a liquid cooling plate with a highly efficient heat dissipation structure. This solves the technical problem of existing technologies' inability to autonomously adjust the cooling medium based on the actual heat output and real-time temperature of the device, achieving true dynamic adjustment and effectively resolving the issue of the inability to simultaneously balance heat dissipation and energy consumption in fixed-flow structures. Please refer to... Figure 1 - Figure 5 The liquid cooling plate with a high-efficiency heat dissipation structure includes a liquid cooling plate body 1 and a cooling flow pipe 2 with a meandering bow-shaped structure forming a cooling medium channel inside it. The cooling flow pipe 2 is an integral continuous structure without any breaks, ensuring that the cooling medium circulates continuously inside the pipe. The straight section of the cooling flow pipe 2 is provided with an adaptive turbulence structure 3 that dynamically turbulents the coolant. The middle and both sides of the cooling flow pipe 2 form a high-temperature zone and a low-temperature zone, respectively. Existing liquid cooling plates mostly employ fixed turbulence columns and fixed flow channels to enhance heat dissipation. However, fixed turbulence methods are difficult to adaptively adjust to changes in the load of the heat-generating element, i.e., changes in the cooling medium temperature. When the heat-generating element is lightly loaded and the cooling medium temperature is low, the fixed turbulence structure will additionally increase the flow resistance of the cooling medium, leading to increased water pump energy consumption. To solve the above problems, such as... Figure 1 - Figure 10 As shown, the adaptive turbulence structure 3 includes bimetallic strips 31 arranged vertically and equidistantly along the straight section of the cooling pipe 2. One end of the bimetallic strip 31 is fixedly connected to the cooling pipe 2, and the other end is a free bending end. The bimetallic strip 31 includes iron strips 311 and copper strips 312 that are compositely bonded and fixed. The iron strips 311 and copper strips 312 of two adjacent bimetallic strips 31 are installed in opposite positions. At the same temperature, the bending directions of two adjacent bimetallic strips 31 are opposite, forming a wave-shaped flow channel. The bimetallic strip 31 is composed of copper strips 312 and iron strips 311 and is equidistantly arranged inside the cooling pipe 2. Its core function is to realize dynamic adaptive turbulence. By utilizing the difference in thermal expansion coefficients between copper and iron and the rapid heating characteristics of copper, it adaptively bends with the temperature change of the cooling pipe 2, and adjacent bimetallic strips 31 bend in opposite directions to form a wave-shaped flow channel, which enhances fluid turbulence and improves heat exchange efficiency.

[0020] The cooling plate 12 provides support for the heating element. The heat generated by the heating element when it is working is first transferred to the cooling plate 12. The cooling plate 12 quickly diffuses the locally concentrated high temperature heat to the entire plate surface. The diffused heat penetrates the cooling plate 12 and is transferred to one end of the bow-shaped thermoelectric generator 42 in the slot inside the cooling plate 12. At the same time, the coolant in the cooling pipe 2 circulates and transfers its own low temperature to the other end of the thermoelectric generator 42. The thermoelectric generator 42 uses the temperature difference between the two ends to convert waste heat into weak electrical energy, realizing the recovery and reuse of waste heat.

[0021] Specifically, such as Figure 9 As shown, the cross-section of the cooling pipe 2 is rectangular. The inner wall of the cooling pipe 2 is fixed with a gasket 32 ​​at the position corresponding to the bent end of the bimetallic strip 31 to limit its bending range and form a flow channel. The gasket 32 ​​is located at both ends of the bent end of the bimetallic strip 31, which plays a local support role, limits the maximum bending range of the bimetallic strip 31, and avoids the bimetallic strip 31 from bending too much, causing the bent end to stick to the inner wall of the cooling pipe 2 and block the flow channel, thus ensuring the stable flow of the cooling medium. When the temperature of the bimetallic strip 31 increases, the width of the channel between the bent end and the inner wall of the cooling pipe 2 decreases. When the temperature of the bimetallic strip 31 decreases, the width of the channel increases.

[0022] Most of the heat penetrating the cooling plate 12 is transferred to the cooling pipe 2, causing the overall temperature of the cooling pipe 2 to rise. The middle part of the cooling pipe 2 is the high-temperature zone, corresponding to the area directly below the heating element, where the heat is most concentrated. The two sides are low-temperature zones, far away from the heating element, where the heat gradually diffuses. The coolant in the cooling pipe 2 circulates under the guidance of the inlet and outlet pipes 22. When flowing through the high-temperature zone, it absorbs a large amount of heat, and when flowing through the low-temperature zone, it gradually dissipates the absorbed heat. Finally, the coolant carrying the heat is discharged from the cooling plate 12 through the outlet pipe 22, completing the heat dissipation and achieving the core heat dissipation of the heating element.

[0023] It should be noted that, as Figure 7 - Figure 10 As shown, the copper sheets 312 of two adjacent bimetallic sheets 31 are respectively attached to the inner wall of the cooling pipe 2. The coefficient of thermal expansion of the copper sheet 312 of the bimetallic sheet 31 is greater than that of the iron sheet 311. The copper sheet 312 responds to heat faster than the iron sheet 311. When the bimetallic sheet 31 is heated, it bends towards the side of the iron sheet 311.

[0024] To avoid localized overheating caused by heat exchange lag and address the slow response speed of the bimetallic turbulence element, a bimetallic material with a large difference in thermal expansion coefficients, copper sheet 312 and iron sheet 311, is selected. Copper sheet 312 has a fast thermal response speed. A vertically arranged installation method, with one end fixed and the other end freely bending, allows the bimetallic sheet 31 to quickly respond to temperature changes in the cooling medium. When the load on the heating element changes abruptly, the bending amplitude can be adjusted promptly to quickly strengthen or weaken the turbulence intensity. Since the cooling plate 12 experiences varying degrees of heating at its top (generally high temperature in the middle and low temperature on both sides), differentiated design is implemented, such as... Figure 7 - Figure 8 As shown, the length of the bimetallic strip 31 in the high-temperature zone of the cooling pipe 2 is greater than that in the low-temperature zone, and the distance between two adjacent bimetallic strips 31 in the high-temperature zone is smaller than that between two adjacent bimetallic strips 31 in the low-temperature zone. The bimetallic strips 31, which are equidistantly arranged in the cooling pipe 2, adaptively bend with the temperature change of the cooling pipe 2, thereby forming a dynamic turbulence channel. The specific principle is as follows: the coefficient of thermal expansion of the copper strip 312 is greater than that of the iron strip 311, and the thermal response speed of copper is faster than that of iron. When the temperature inside the cooling pipe 2 rises, the copper strip of the bimetallic strip 31... The 312 side expands rapidly when heated, while the iron sheet 311 side expands more slowly, causing the bimetallic strip 31 to bend towards the iron sheet 311 side as a whole. Since the copper sheet 312 of two adjacent bimetallic strips 31 are installed in opposite positions to the iron sheet 311, that is, the copper sheet 312 of one bimetallic strip 31 is attached to the inner wall of one side of the cooling pipe 2 and the iron sheet 311 faces the center of the pipe cavity, while the copper sheet 312 of the adjacent bimetallic strip 31 is attached to the inner wall of the other side of the cooling pipe 2 and the iron sheet 311 faces the center of the pipe cavity, under the same temperature, the bending directions of the two adjacent bimetallic strips 31 are opposite.

[0025] When the heating element is under high load, especially in the high-temperature zone, the bimetallic strip 31 bends more, narrowing the channel between the bent end and the inner wall of the cooling pipe 2. This increases the resistance to coolant flow, enhances fluid turbulence, and improves heat exchange efficiency. When the temperature inside the cooling pipe 2 is lower, the bimetallic strip 31 bends less, widening the channel between the bent end and the inner wall of the cooling pipe 2. This reduces the resistance to coolant flow, lowering pump energy consumption. Compared to a fixed turbulence channel, this structure achieves dynamic turbulence adjustment with a large opening at low temperatures and a small opening at high temperatures, balancing heat dissipation efficiency and system energy saving.

[0026] Meanwhile, the cooling pipe 2 has a meandering bow-shaped structure, which, together with the wave-shaped flow channel formed by the reverse bending of the adjacent bimetallic strips 31, makes the coolant form a composite flow of circumference and disturbance in the pipe, which completely destroys the fluid boundary layer and further improves the convective heat transfer efficiency. Moreover, the length of the bimetallic strips 31 in the high-temperature zone is longer than that in the low-temperature zone, and the distance between adjacent bimetallic strips 31 in the high-temperature zone is shorter than that in the low-temperature zone, so that the turbulence intensity in the high-temperature zone is higher than that in the low-temperature zone, realizing precise enhanced heat dissipation in the heat concentration area and further optimizing the overall temperature uniformity.

[0027] Example 2 Based on Example 1, such as Figure 1 - Figure 3 As shown, the liquid cooling plate body 1 includes a flow channel plate 11 with a downward recess in the middle, and a cooling plate 12 is provided at the top of the flow channel plate 11. Both the cooling plate 12 and the flow channel plate 11 are made of composite materials, which are stretched into a box shape and then brazed, and fixed by a number of sealing rivet nuts 13. Brazing is different from the welding structure fixing on the market, which makes the liquid cooling plate body 1 structurally stronger, better sealing, and has better performance and dimensional accuracy such as flatness, thereby reducing the product defect rate and cost.

[0028] It should be noted that, as Figure 1 - Figure 2 As shown, the outer walls of the flow channel plate 11 are fixed with an inlet pipe 21 and an outlet pipe 22, which are respectively connected to the two ends of the cooling flow pipe 2. A water pump is installed at the water pipe, which can transfer the electrical energy generated by the thermoelectric generator 42 to the water pump, providing auxiliary power to the water pump and reducing external power consumption.

[0029] To improve the energy utilization rate of the liquid cooling plate body 1 and reduce energy waste, a preheating recovery structure 4 is added, such as... Figure 3 - Figure 4 As shown, a preheating recovery structure 4 is provided inside the cooling plate 12. The preheating recovery structure 4 includes a temperature difference slot 41 opened inside the cooling plate 12. The temperature difference slot 41 is arranged along the arc-shaped extension direction of the cooling pipe 2. A thermoelectric generator 42 with the same extension direction is embedded inside the temperature difference slot 41. The top end of the thermoelectric generator 42 is in close contact with the heat dissipation element, and the bottom end is in close contact with the cooling pipe 2. The waste heat is converted into weak electrical energy by utilizing the temperature difference between the two ends, realizing the recovery and reuse of energy and improving the energy utilization efficiency of the liquid cooling plate. The continuous arc-shaped structure can increase its contact area with the heat dissipation element and the cooling pipe 2, and improve the thermoelectric power generation efficiency.

[0030] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid cooling plate with a high-efficiency heat dissipation structure, comprising a liquid cooling plate body (1) and a cooling flow pipe (2) disposed therein to form a cooling medium channel and having a meandering arc-shaped structure, characterized in that: The straight section of the cooling pipe (2) is provided with an adaptive turbulence structure (3) that dynamically turbulents the coolant. The middle and both sides of the cooling pipe (2) form a high temperature zone and a low temperature zone, respectively. The adaptive turbulence structure (3) includes bimetallic sheets (31) arranged vertically and equidistantly along the straight section of the cooling pipe (2). One end of the bimetallic sheet (31) is fixedly connected to the cooling pipe (2), and the other end is a free bending end. The bimetallic sheet (31) includes iron sheet (311) and copper sheet (312) that are compositely bonded and fixed. The iron sheet (311) and copper sheet (312) of two adjacent bimetallic sheets (31) are installed in opposite positions. At the same temperature, the bending directions of two adjacent bimetallic sheets (31) are opposite and a wave-shaped flow channel is formed.

2. The liquid cooling plate with a high-efficiency heat dissipation structure according to claim 1, characterized in that: The cooling pipe (2) has a rectangular cross-section, and the inner wall of the cooling pipe (2) is fixed with a gasket (32) at the bending end of the bimetallic strip (31) to limit its bending range and form a flow channel.

3. The liquid cooling plate with a high-efficiency heat dissipation structure according to claim 1, characterized in that: The copper sheets (312) of the two adjacent bimetallic sheets (31) are respectively attached to the inner wall of the cooling pipe (2).

4. The liquid cooling plate with a high-efficiency heat dissipation structure according to claim 1, characterized in that: The length of the bimetallic strip (31) in the high-temperature zone of the cooling pipe (2) is greater than the length of the bimetallic strip (31) in the low-temperature zone, and the distance between two adjacent bimetallic strips (31) in the high-temperature zone is less than the distance between two adjacent bimetallic strips (31) in the low-temperature zone.

5. A liquid cooling plate with a high-efficiency heat dissipation structure according to claim 1, characterized in that: The liquid cooling plate body (1) includes a flow channel plate (11) with a downward recess in the middle. A cooling plate (12) is provided at the top of the flow channel plate (11). Both the cooling plate (12) and the flow channel plate (11) are made of composite material, which is stretched into a box shape and then brazed, and fixed by several sealing rivet nuts (13).

6. A liquid cooling plate with a high-efficiency heat dissipation structure according to claim 5, characterized in that: The outer wall of the flow channel plate (11) is fixed with an inlet pipe (21) and an outlet pipe (22) that are respectively connected to the two ends of the cooling flow pipe (2).

7. A liquid cooling plate with a high-efficiency heat dissipation structure according to claim 6, characterized in that: The cooling plate (12) is provided with a preheating recovery structure (4). The preheating recovery structure (4) includes a temperature difference slot (41) opened inside the cooling plate (12). The temperature difference slot (41) is arranged along the arc-shaped extension direction of the cooling flow pipe (2). The temperature difference slot (41) is fitted with a thermoelectric generator (42) that is consistent with its extension direction.

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