Heat dissipation control method and device based on piezoelectric jet flow and thermoelectric refrigeration cooperative coupling

Abstract

This invention discloses a heat dissipation control method and device based on the synergistic coupling of piezoelectric jet and thermoelectric cooling. The heat dissipation control method includes: controlling a piezoelectric ceramic driving plate to drive an intake flexible valve plate to generate periodic bending deformation, thereby changing the volume of the compression chamber, so that the compression chamber alternately performs the intake process and the compression process; during the compression process, when the pressure difference between the compression chamber and the external environment pressure reaches the opening threshold determined by the pre-tightening force and effective pressure area of ​​the outlet flexible valve plate, the outlet flexible valve plate passively generates an opening deformation, so that the cooling fluid in the compression chamber is injected into the air inlet of the heat exchange module in the form of a jet through the air outlet; the heat from the heat source is absorbed by the cold end of the thermoelectric cooling module, and the heat is transferred to the hot end of the thermoelectric cooling module, and then transferred to the heat exchange module, and carried away by the cooling fluid injected from the air inlet of the heat exchange module, fundamentally avoiding the risk of fatigue failure of traditional mechanical valve plates.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation technology for electronic devices, and more specifically to a heat dissipation control method and apparatus based on the synergistic coupling of piezoelectric jet and thermoelectric cooling. Background Technology

[0002] In existing heat dissipation devices integrating piezoelectric jets and thermoelectric cooling, the piezoelectric jet module typically requires independent inlet and outlet check valves to control the flow direction of the cooling fluid. This results in a large number of valves, a complex overall structure, and significant assembly difficulties. Furthermore, multiple mechanical valves are prone to mechanical fatigue failure under long-term high-frequency operation, reducing the long-term reliability of the device. In addition, the lack of an effective coordinated control mechanism between the thermoelectric cooling module and the piezoelectric jet module, with each adjusting independently, makes it difficult to achieve real-time matching of cooling capacity and heat dissipation capacity based on dynamic changes in the heat load of the heat source, leading to low overall energy efficiency of the heat dissipation system. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling, so as to solve the problems in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling is applied to a heat dissipation control device. The heat dissipation control device includes a thermoelectric cooling module, a heat exchange module, and a piezoelectric driven fluid module. The cold end of the thermoelectric cooling module is used to contact the heat source, and its hot end is in contact with the heat exchange surface of the heat exchange module. The piezoelectric driven fluid module includes a shell forming at least one compressed air chamber, an inlet flexible valve plate, an outlet flexible valve plate, and a piezoelectric ceramic driving plate. The shell is provided with at least one air inlet and multiple air outlets corresponding to the compressed air chamber. The heat exchange module has an air inlet communicating with the air outlets. The heat dissipation control method includes the following steps: The piezoelectric ceramic driving plate is controlled to drive the intake flexible valve plate to produce periodic bending deformation, thereby changing the volume of the compression chamber, so that the compression chamber alternately performs the intake process and the compression process; During the air compression process, when the pressure difference between the air compression chamber and the external environment reaches the opening threshold determined by the pre-tightening force and effective pressure area of ​​the outlet flexible valve plate, the outlet flexible valve plate passively undergoes opening deformation, causing the cooling fluid in the air compression chamber to be injected into the air inlet of the heat exchange module through the outlet hole in the form of an impact jet perpendicular to the heat exchange surface of the heat exchange module. The heat from the heat source is absorbed by the cold end of the thermoelectric cooling module, and the heat is transferred to the hot end of the thermoelectric cooling module. The heat is then transferred to the heat exchange module via the hot end and carried away by the cooling fluid injected from the air inlet of the heat exchange module. The thermal state parameters of the heat dissipation control device are acquired in real time, and the power of the thermoelectric cooling module and / or the driving voltage or frequency of the piezoelectric ceramic driving plate are dynamically adjusted according to the thermal state parameters so that the flow rate and velocity of the impinging jet and the cooling capacity of the thermoelectric cooling module are coordinated to match the heat load changes of the heat source.

[0005] In one embodiment, during the intake process, the pressure in the compressed air chamber is lower than the external ambient pressure, and the flexible valve plate at the outlet remains closed under the action of external pressure to prevent external fluid from flowing back from the outlet. During the air compression process, when the pressure in the air compression chamber rises until it exceeds the opening threshold, the outlet flexible valve plate is passively opened to establish a one-way jet channel from the air compression chamber to the heat exchange module.

[0006] In one embodiment, the opening threshold satisfies the condition that the pressure difference between the inside and outside of the compressed air chamber is greater than or equal to the ratio of the preload of the outlet flexible valve plate to its effective pressure-bearing area.

[0007] In one embodiment, the dynamic behavior of the drive unit consisting of the intake flexible valve plate and the piezoelectric ceramic drive plate is determined by its equivalent mass, damping coefficient, equivalent stiffness and piezoelectric coefficient. The dynamics of the passive opening process of the flexible valve disc are determined by its equivalent mass, damping coefficient, equivalent stiffness, effective pressure area, and preload.

[0008] In one embodiment, the dynamic adjustment includes: The temperature of the heat source, the ambient temperature, and / or the air velocity at the air outlet are collected as the thermal state parameters. A coupled prediction model is constructed based on the historical time-series data of the thermal state parameters. The coupled prediction model is used to describe the dynamic coupling relationship between heat load, heat dissipation capacity and environmental conditions. The model predictive control algorithm is used to calculate the future temperature change trend based on the coupled predictive model, and output the optimal adjustment amount that makes the temperature of the heat source approach the target value. The driving voltage or frequency of the piezoelectric ceramic driving plate and the power of the thermoelectric cooling module are adjusted synchronously or asynchronously according to the optimal adjustment amount.

[0009] In one embodiment, it further includes: Based on the thermal state parameters, determine whether the current operating condition is a steady-state condition or a dynamic condition; When the condition is determined to be steady-state, model predictive control mode is adopted; When the condition is determined to be dynamic and continues for more than the preset sampling period, the system switches to PID control mode, and the initial output value of the PID control mode inherits the last adjustment amount of the model prediction control mode before the switch. Once the dynamic operating condition ends and the thermal state parameters stabilize beyond the preset sampling period, the system smoothly reverts to model predictive control mode.

[0010] In one embodiment, the heat exchange module is hollow inside, the air inlet of the heat exchange module is opened at the top, the air outlet of the heat exchange module is opened on the side, and the air outlet of the heat exchange module is provided with an inclined surface structure. The heat dissipation control method further includes: accelerating the jet fluid injected into the heat exchange module through cross-sectional area changes as it flows through the inclined surface structure, so as to project it to the external environment over a long distance.

[0011] In one embodiment, it is characterized by, When a positive voltage is applied to the piezoelectric ceramic driving plate, it drives the intake flexible valve plate to deform in a direction away from the air outlet, thereby performing the air intake process. When a reverse voltage is applied, the piezoelectric ceramic driving plate drives the intake flexible valve plate to deform towards the outlet, thereby performing the air compression process.

[0012] A heat dissipation control device based on the synergistic coupling of piezoelectric jet and thermoelectric cooling, comprising: A thermoelectric cooling module, wherein the cold end is used to contact the heat source, and the hot end is in contact with the heat exchange surface of the heat exchange module; The heat exchange module has an air inlet that communicates with the air outlet. A piezoelectric driven fluid module includes a housing having at least one compressed air chamber and a control component disposed corresponding to the compressed air chamber. The housing is provided with at least one air inlet and multiple air outlets corresponding to the compressed air chamber. The control component includes a piezoelectric ceramic drive plate, an air inlet flexible valve plate, and an air outlet flexible valve plate disposed at the air outlets. The flexible valve plate has a preset preload. The flexible valve plate is passively opened only when the difference between the pressure in the compressed air chamber and the external ambient pressure is greater than or equal to the ratio of the preload to the effective pressure-bearing area of ​​the flexible valve plate. This allows the cooling fluid to be sprayed into the heat exchange module in an impact jet pattern perpendicular to the heat exchange surface of the heat exchange module. The housing includes a base and a sealed top cover. The base is provided with a first limiting block and a second limiting block, and the sealed top cover is provided with a third limiting block. The inlet flexible valve plate and the piezoelectric ceramic drive plate are installed in the first fixing slot of the first limiting block, and the outlet flexible valve plate is installed in the second fixing slot of the second limiting block. The third limiting block is provided with a limiting space for limiting the opening range of the outlet flexible valve plate.

[0013] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention utilizes the pre-tensioned force and effective pressure-bearing area of ​​the outlet flexible valve plate to define the opening threshold condition, ensuring that the passive opening threshold is combined with the impact jet through pressure difference, thereby improving the jet kinetic energy and heat exchange efficiency. Specifically, during the compression process, the outlet flexible valve plate is only passively opened when the pressure difference between the inside and outside of the compression chamber reaches this threshold, ensuring that the cooling fluid forms a high-speed impact jet perpendicular to the heat exchange surface of the heat exchange module with sufficient kinetic energy. This impact jet can effectively disrupt the thermal boundary layer, significantly improving the convective heat transfer coefficient. Simultaneously, the outlet flexible valve plate does not require active actuation, relying on the pressure difference to achieve unidirectional flow naturally, avoiding the fatigue failure problem of traditional mechanical valve plates.

[0014] This invention brings the hot end of the thermoelectric cooling module into direct thermal contact with the heat exchange module, and injects an impinging jet vertically into the heat exchange module, forming a short thermal path of thermoelectric pump heat dissipation followed by jet impingement heat removal. This achieves synergy between the thermoelectric cooling and the impinging jet in a compact thermal path, meeting the needs of high heat flux density scenarios. Specifically, the thermoelectric cooling module actively pumps heat from its heat source to the heat exchange surface of the heat exchange module, while the impinging jet impacts the heat exchange surface at high speed, greatly enhancing the heat dissipation capacity of the hot end. This achieves deep spatial and functional coupling, effectively overcoming the problem of reduced cooling efficiency caused by insufficient heat dissipation at the hot end in traditional solutions.

[0015] This invention acquires thermal state parameters such as heat source temperature and ambient temperature in real time, and dynamically adjusts the power of the thermoelectric cooling module and / or the driving voltage or frequency of the piezoelectric ceramic driver based on these parameters. This coordinated dynamic adjustment based on thermal state parameters achieves on-demand matching of cooling capacity and heat dissipation capacity. Specifically, according to changes in heat load, the jet intensity (changing flow rate / velocity) and cooling capacity (changing TEC power) are adjusted synchronously or asynchronously to ensure optimal matching between the two. When the heat load is low, the TEC current and piezoelectric driving frequency are simultaneously reduced to avoid overcooling and ineffective jetting. When the heat load suddenly increases, the jet intensity is prioritized to enhance the heat dissipation capacity at the hot end, and then the TEC current is appropriately increased to prevent overheating at the hot end. This effectively solves the core problem of mismatch between cooling and heat dissipation, achieving on-demand heat dissipation and significantly improving system energy efficiency.

[0016] This invention requires only one piezoelectric drive assembly in conjunction with a pre-tightened flexible exhaust valve to achieve high-pressure unidirectional jetting, eliminating the need for separate inlet and outlet check valves in traditional solutions. This reduces moving parts, simplifies assembly, and lowers the risk of mechanical fatigue failure during long-term operation. Furthermore, this method is adaptable to flat, stacked structures, making it suitable for space-constrained applications such as ultra-thin laptops and server blades. Attached Figure Description

[0017] Figure 1 A flowchart illustrating the heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling provided by this invention; Figure 2 A schematic diagram of a heat dissipation control device based on the synergistic coupling of piezoelectric jet and thermoelectric cooling provided by the present invention; Figure 3 for Figure 2 A cross-sectional structural schematic diagram of the heat dissipation control device in the middle; Figure 4 for Figure 2 A schematic diagram of the piezoelectric-driven fluid module in the diagram; Figure 5 for Figure 4 A cross-sectional view of the piezoelectric-driven fluid module in the diagram; Figure 6 for Figure 5 A partially enlarged structural diagram of point A of the piezoelectric driven fluid module in the image; Figure 7 for Figure 4 An exploded structural diagram of the piezoelectric-driven fluid module in the image; Figure 8 for Figure 4 A schematic diagram of the sealed top cover of the piezoelectric-driven fluid module in the image; Figure 9 for Figure 4 A schematic diagram of the connection structure between the base and control components of the piezoelectric driven fluid module in the diagram; Figure 10 for Figure 9 An exploded view of the base and control components. In the diagram: 1. Thermoelectric refrigeration module; 2. Heat exchange module; 21. Air inlet; 22. Air outlet; 3. Piezoelectric driven fluid module; 31. Housing; 311. Base; 3111. First limiting block; 3111-1. First fixing slot; 3111-2. Second fixing slot; 3112. Second limiting block; 3113. Sealing groove; 3114. Air outlet; 312. Sealing top cover; 3121. Third limiting block; 3121-1. Sealing stop; 3121-2. Limiting piece; 3121-3. Third fixing slot; 3122. Sealing protrusion; 3123. Air inlet; 32. Control component; 321. Piezoelectric ceramic drive piece; 322. Inlet flexible valve piece; 323. Outlet flexible valve piece; 33. Compressed air chamber. 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] like Figures 1 to 10 As shown, the present invention provides a heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling, applied to a heat dissipation control device. The heat dissipation control device includes a thermoelectric cooling module 1, a heat exchange module 2, and a piezoelectric driven fluid module 3. The cold end of the thermoelectric cooling module 1 is used to contact the heat source, and the hot end of the thermoelectric cooling module 1 is in contact with the heat exchange surface of the heat exchange module 2. The piezoelectric driven fluid module 3 includes a shell 31 having at least one compressed air chamber 33 and a control component 32 corresponding to the compressed air chamber 33. The shell 31 is provided with at least one air inlet 3123 and multiple air outlets 3114 corresponding to the compressed air chamber 33. The control component 32 includes a piezoelectric ceramic driving plate 321, an air inlet flexible valve plate 322, and an air outlet flexible valve plate 323 disposed at the air outlets 3114. The heat exchange module 2 has an air inlet 21 communicating with the air outlets 3114. It should be noted that thermally conductive interface material (such as thermally conductive silicone) is filled between the cold end of thermoelectric cooling module 1 and the heat source, as well as between the hot end of thermoelectric cooling module 1 and the heat exchange module 2. Specifically, the cold end of thermoelectric cooling module 1 (e.g., a semiconductor cooling chip TEC) is in close contact with the surface of the heat source (e.g., a high-power chip) through thermally conductive silicone grease to actively absorb the heat generated by the heat source. Similarly, the hot end of thermoelectric cooling module 1 forms thermal contact with the outer wall of the heat exchange surface of heat exchange module 2 through thermally conductive silicone grease to transfer the absorbed heat outward.

[0020] like Figures 2 to 3As shown, the heat exchange module 2 is a hollow shell structure 31 made of a highly thermally conductive material (such as copper or aluminum). Multiple air inlets 21 are provided on its top to receive cooling fluid from the piezoelectrically driven fluid module 3. An air outlet 22 is provided on one side of the heat exchange module 2, and this outlet 22 has an inclined surface structure (e.g., an inclination angle of 30 degrees or 45 degrees). By gradually decreasing the cross-sectional area, the flow rate of the fluid is increased, thereby enabling the hot fluid to be projected over a long distance to the external environment. The internal cavity of the heat exchange module 2 provides channels for the flow of cooling fluid and heat exchange.

[0021] like Figure 2 , Figures 4 to 10 As shown, the piezoelectric driven fluid module 3 includes a housing 31, a piezoelectric ceramic drive plate 321, an inlet flexible valve plate 322, and an outlet flexible valve plate 323. The housing 31 is connected to the base 311 and the sealing top cover 312 by fitting together through a sealing groove 3113 and a sealing protrusion 3122, and has an internal receiving cavity. At least one control component 32 is installed in the receiving cavity. In the initial state, a sealed compressed air chamber 33 is formed between the control component 32 and the housing 31.

[0022] like Figure 2 , Figures 4 to 10 As shown, at least one first limiting unit is provided on the base 311, at least one second limiting unit is provided on the sealed top cover 312, and the control component 32 is provided in a one-to-one correspondence with the first limiting unit. The control component 32 is installed on the first limiting unit, and the first limiting unit, the second limiting unit and the control component 32 together form the compressed air chamber 33. The first limiting unit includes two first limiting blocks 3111 arranged opposite to each other. A piezoelectric ceramic driving plate 321 is disposed at both ends of the intake flexible valve plate 322 to form a control unit. The control unit is disposed between the two first limiting blocks 3111. The opposite surfaces of the two first limiting blocks 3111 are provided with a first fixing slot 3111-1 for fixing the piezoelectric ceramic driving plate 321 and the intake flexible valve plate 322. As needed, the first limiting block 3111 can be provided with a through hole so that the control circuit can be electrically connected to the piezoelectric ceramic driving plate 321 through the through hole, thereby realizing the control of the piezoelectric ceramic driving plate 321. The through hole can be provided at the top or one side of the first fixing slot 3111-1 as needed. The first limiting unit also includes several second limiting blocks 3112. The opposing surfaces of the two first limiting blocks 3111 and the two end surfaces of the second limiting blocks 3112 are provided with second fixing slots 3111-2 for fixing the flexible valve plates 323. Each flexible valve plate 323 is installed between two adjacent second fixing slots 3111-2. The second fixing slots 3111-2 of the first limiting block 3111 are located at the end away from the first fixing slot 3111-1. Several second limiting blocks 3112 of the first limiting unit are located between the first fixing slots 3111-1 of the two first limiting blocks 3111 of the first limiting unit.

[0023] In the initial state, the compressed air chamber 33 is positioned between the corresponding air inlet 3123 and air outlet 3114. The intake flexible valve plate 322 is positioned near the air inlet 3123 of the compressed air chamber 33 and is driven by the piezoelectric ceramic drive plate 321. Specifically, one intake flexible valve plate 322 is connected by four piezoelectric ceramic drive plates 321. When voltage is applied, the piezoelectric ceramic drive plates 321 bend due to the inverse piezoelectric effect, thereby causing the intake flexible valve plate 322 to bend accordingly. When the intake flexible valve plate 322 and the outlet flexible valve plate 323 are installed in the housing 31, they are interference-fitted with the receiving cavity of the housing 31 to form the compressed air chamber 33.

[0024] The flexible valve plate 323 is located near the outlet port 3114 of the compression chamber 33. It is normally closed by its own preload and does not require active drive. It is only passively opened when the pressure difference in the compression chamber 33 exceeds a threshold. The outlet port 22 of the piezoelectric driven fluid module 3 is sealed and connected to the inlet port 21 of the heat exchange module 2.

[0025] An intake flexible valve plate 322 is provided with an intake port 3123, which is located on the sealing top cover 312 and is positioned at the middle of the intake flexible valve plate 322. An exhaust flexible valve plate 323 is provided with an exhaust hole 3114, which is located on the base 311 and is positioned at the middle of the exhaust flexible valve plate 323.

[0026] The second limiting unit includes a third limiting block 3121. The third limiting block 3121 is provided with a limiting space to prevent the flexible valve plate 323 from exceeding the preset area. A sealing block 3121-1 is provided on one side of the third limiting block 3121, and a limiting piece 3121-2 corresponding to the flexible valve plate 323 is provided on the other side. A limiting space is formed between the sealing block 3121-1 and the limiting piece 3121-2. A corresponding third fixing groove 3121-3 is also provided on the third limiting block 3121 at the position corresponding to the second limiting block 3112.

[0027] The piezoelectric driven fluid module 3 is stacked with the heat exchange module 2 and the thermoelectric cooling module 1. The heat dissipation control device forms a flat stacked heat dissipation structure with a total height that can be controlled within 6mm, making it suitable for space-constrained scenarios such as ultra-thin laptops and server blades.

[0028] The heat dissipation control method includes the following steps: S100, the piezoelectric ceramic drive plate 321 drives the intake flexible valve plate 322 to produce periodic bending deformation, so as to change the volume of the compression chamber 33, so that the compression chamber 33 alternately performs the intake process and the compression process. In this embodiment, by applying an alternating voltage signal to the piezoelectric ceramic driving plate 321, the intake flexible valve plate 322 is driven to produce periodic bending deformation. When the intake flexible valve plate 322 bends, it changes the volume of the compression chamber 33, thereby causing the compression chamber 33 to alternately perform the intake process and the compression process.

[0029] Specifically, when a positive voltage is applied to the piezoelectric ceramic driving plate 321, it bends and causes the intake flexible valve plate 322 to deform away from the outlet port 3114. At this time, the volume of the compression chamber 33 expands, and the intake process is executed. When a reverse voltage is applied to the piezoelectric ceramic driving plate 321, it bends in the opposite direction and causes the intake flexible valve plate 322 to deform towards the outlet port 3114. At this time, the volume of the compression chamber 33 shrinks, and the compression process is executed.

[0030] S200. During the air compression process, when the pressure difference between the air compression chamber 33 and the external environment pressure reaches the opening threshold determined by the pre-tightening force and effective pressure area of ​​the outlet flexible valve plate 323, the outlet flexible valve plate 323 passively undergoes opening deformation, causing the cooling fluid in the air compression chamber 33 to be sprayed into the air inlet 21 of the heat exchange module 2 through the air outlet 3114 in the form of a jet. The jet is an impact jet perpendicular to the heat exchange surface of the heat exchange module 2, so as to destroy the thermal boundary layer of the heat exchange surface of the heat exchange module 2 and improve the convective heat transfer coefficient. In this embodiment, during the compression process, as the inlet flexible valve plate 322 moves towards the outlet port 3114, the volume of the compression chamber 33 gradually decreases, the internal cooling fluid is compressed, and the pressure inside the compression chamber 33 continuously rises. When the difference between the instantaneous pressure inside the compression chamber 33 and the external atmospheric pressure reaches the opening threshold, the outlet flexible valve plate 323 passively undergoes opening deformation under the action of the pressure difference.

[0031] The opening threshold is determined by the preload of the flexible valve plate 323 and its effective pressure-bearing area. Specifically, the opening threshold satisfies the following condition: the pressure difference between the inside and outside of the compressed air chamber 33 is greater than or equal to the ratio of the preload of the flexible valve plate 323 to its effective pressure-bearing area. Once the opening threshold is met, the flexible valve plate 323 is passively opened, the pressure chamber is connected to the outlet port 3114, and the cooling fluid in the compressed air chamber 33 is ejected at high speed through the outlet port 3114 in the form of a jet and injected into the inlet port 21 of the heat exchange module 2.

[0032] Specifically, during the compression process, in the piezoelectric jet module, a reverse voltage is applied to the piezoelectric ceramic drive plate 321, causing the piezoelectric ceramic drive plate 321 and the inlet flexible valve plate 322 to bend and deform towards the outlet 22. When the deformation position of the inlet flexible valve plate 322 exceeds the position of the inlet 3123, the inlet is not connected to the compression chamber 33 and the outlet 22 is not opened, resulting in a closed environment inside the compression chamber 33. When the deformation of the inlet valve plate further increases to its maximum, the fluid inside the compression chamber 33 is compressed, and the pressure inside the compression chamber 33 increases. When the pressure increases to a certain level, the flexible valve plate 323 deforms towards the position of the outlet port 22 due to the pressure. When the deformation of the flexible valve plate 323 exceeds the outlet port 22, the compressed air chamber 33 is connected to the outlet port 22. At this time, due to the large pressure in the compressed air chamber 33, the fluid will be jetted into the air inlet 21 of the heat exchange module 2 through the outlet port 22.

[0033] S300: The heat from the heat source is absorbed by the cold end of the thermoelectric cooling module 1, and the heat is transferred to the hot end of the thermoelectric cooling module 1. The heat is then transferred to the heat exchange module 2 via the hot end and carried away by the cooling fluid injected from the air inlet 21 of the heat exchange module 2. In this embodiment, the thermoelectric cooling module 1 is in operation simultaneously with the jet cooling fluid injected into the heat exchange module 2. The cold end of the thermoelectric cooling module 1 absorbs heat generated by the heat source and pumps the heat from the cold end to the hot end using the Peltier effect. After the heat is transferred to the hot end of the thermoelectric cooling module 1, it is then transferred from the hot end to the wall of the heat exchange module 2, which is in thermal contact with it. At this time, the jet cooling fluid injected into the heat exchange module 2 flows through the area where the hot end is located, carrying away the heat from the wall surface through convection heat transfer, completing the entire heat dissipation cycle.

[0034] Within heat exchange module 2, cooling fluid enters through the air inlet 21 and is jetted to the bottom of the internal cavity. The fluid undergoes convective heat transfer as it flows through heat exchange module 2, transferring the heat from the thermoelectric cooling module to the cooling fluid itself. At this point, a positive pressure is created within heat exchange module 2, forcing the cooling fluid outwards. Heat from the heat source is transferred to the thermoelectric cooling module, then to heat exchange module 2, and finally to the cooling fluid before being carried away. This process is repeated continuously to achieve heat dissipation.

[0035] S400: Real-time acquisition of thermal state parameters of the heat dissipation control device, and dynamic adjustment of the power of thermoelectric cooling module 1 and / or the driving voltage or frequency of piezoelectric ceramic driving plate 321 according to the thermal state parameters, so that the flow rate and velocity of the jet and the cooling capacity of thermoelectric cooling module 1 are coordinated to match the heat load changes of the heat source.

[0036] In this embodiment, in order to achieve dynamic matching between heat dissipation capacity and heat load, the present invention obtains the thermal state parameters of the heat dissipation control device in real time through sensors deployed at key locations of the heat dissipation control device (such as temperature sensors at the heat source, temperature sensors at the ambient air inlet, temperature sensors at the air outlet of the heat exchange module 2, and wind speed sensors).

[0037] After receiving these thermal state parameters, the controller dynamically adjusts the power of the thermoelectric cooling module 1 (e.g., adjusting the operating current of the TEC) and / or the driving voltage or frequency of the piezoelectric ceramic driver 321 according to a preset control algorithm (thereby changing the flow rate and velocity of the jet). This adjustment is synergistic, meaning that the flow rate and velocity of the jet and the cooling capacity of the thermoelectric cooling module 1 are adjusted synchronously or asynchronously to match the real-time heat load changes of the heat source, avoiding inefficient situations such as over-cooling with insufficient heat dissipation or excessive heat dissipation with insufficient cooling.

[0038] In one embodiment, during the intake process, the pressure inside the compressed air chamber 33 is lower than the external ambient pressure, and the outlet flexible valve plate 323 remains closed under the action of external pressure to prevent external fluid from flowing back from the outlet port 3114. During the compression process, when the pressure in the compression chamber 33 rises until it exceeds the opening threshold, the outlet flexible valve plate 323 is passively opened, establishing a one-way jet channel from the compression chamber 33 to the heat exchange module 2.

[0039] In one embodiment, the opening threshold satisfies that the pressure difference between the inside and outside of the compressed air chamber 33 is greater than or equal to the ratio of the preload of the outlet flexible valve plate 323 to its effective pressure-bearing area.

[0040] In this embodiment, during the compression process, the outlet flexible valve 323 is passively opened only when the pressure exceeds the opening threshold, establishing a unidirectional jet channel from the compression chamber 33 to the heat exchange module 2. The opening threshold satisfies the following relationship: the pressure difference between the inside and outside of the compression chamber 33 is greater than or equal to the ratio of the preload of the outlet flexible valve 323 to its effective pressure-bearing area. By adjusting the material thickness, width, or pre-compression of the outlet flexible valve 323, different opening thresholds can be preset to adapt to different application scenarios. Specifically, the opening threshold must at least satisfy the following: , in, The instantaneous pressure of the compressed air chamber 33. Due to external environmental pressures, The preload force of the flexible valve plate 323 (such as the preload force generated by the elasticity of the flexible valve plate 323 itself and the installation pre-compression in the undeformed state). The effective pressure-bearing area of ​​the flexible valve plate 323 for air outlet.

[0041] In one embodiment, during the intake process, the pressure inside the compressed air chamber 33 is lower than the external ambient pressure, and the outlet flexible valve plate 323 remains closed under the action of external pressure, which can effectively prevent external fluid from flowing back from the outlet port 3114 and ensure the unidirectionality of airflow.

[0042] Specifically, during the intake process, in the piezoelectric jet module, a voltage is applied to the piezoelectric ceramic driving plate 321, causing it to bend due to the inverse piezoelectric effect, which in turn causes the intake flexible valve plate 322 to deform. The intake flap becomes convex in the middle, that is, the intake flap moves away from the outlet 22. When the deformation position of the intake flap exceeds the position of the inlet 3123, the compression chamber 33 connects to the inlet 3123 and to the external fluid, thus forming an intake in the compression chamber 33. At this time, due to the negative pressure, the outlet flexible valve plate 323 deforms at its center towards the outlet 22. At this time, the outlet 22 is blocked by the outlet flexible valve plate 323 and its surrounding structure, and is not connected to the compression chamber 33. During this process, the external fluid enters the compression chamber 33, forming a state of waiting for compression.

[0043] In one embodiment, the dynamic behavior of the drive unit consisting of the intake flexible valve plate 322 and the piezoelectric ceramic drive plate 321 is determined by its equivalent mass, damping coefficient, equivalent stiffness and piezoelectric coefficient.

[0044] Specifically, the dynamic behavior of the drive unit composed of the intake flexible valve plate 322 and the piezoelectric ceramic drive plate 321 satisfies: , in, The displacement of the intake flexible valve plate 322 at its center point perpendicular to the initial plane. Input voltage, It is the piezoelectric coefficient (i.e., the equivalent piezoelectric coupling coefficient of the drive unit composed of the piezoelectric ceramic drive plate and the intake flexible valve plate, which characterizes the driving force generated per unit voltage). , , These represent the equivalent mass, damping coefficient, and equivalent stiffness of the intake flexible valve plate 322, respectively. The inertial force of the intake valve plate is 322.

[0045] In one embodiment, the dynamics of the passive opening process of the vent flexible valve plate 323 are determined by its equivalent mass, damping coefficient, equivalent stiffness, effective pressure area, and preload.

[0046] Specifically, the passive opening process of the outlet flexible valve plate 323 satisfies the kinetic equation: ; in, For the equivalent mass of the 323 flexible valve plate at the outlet, The displacement of the flexible valve plate 323 at its center point perpendicular to the initial plane. The damping coefficient is... For equivalent stiffness, For the effective pressure-bearing area, The opening force generated by the pressure difference acting on the flexible valve plate at the outlet is... For preload, The inertial force of the flexible valve plate 323 for air outlet.

[0047] In one embodiment, the pressure dynamics of the compressed air chamber 33 are coordinated with the movements of the inlet flexible valve plate 322 and the outlet flexible valve plate 323 to satisfy the following: , in, The instantaneous pressure of the compressed air chamber 33. External atmospheric pressure, The instantaneous volumetric flow rate at the air inlet is 3123. The initial chamber volume, , These refer to the effective pressure-bearing areas of the inlet flexible valve plate 322 and the outlet flexible valve plate 323, respectively. , These represent the displacements of the center points of the inlet flexible valve plate 322 and the outlet flexible valve plate 323, respectively. , The speeds are respectively the intake flexible valve plate 322 and the exhaust flexible valve plate 323.

[0048] in, The instantaneous volumetric flow rate of the intake port 3123 is determined by the opening displacement of the intake flexible valve plate 322. and the pressure difference between the inside and outside of the compressed air chamber Jointly decided, to satisfy: in, It is the inlet flow coefficient (dimensionless, usually taken as an empirical value of 0.6 to 0.7). The effective flow area of ​​the air inlet (as the air inlet expands) (Changes). Among them, effective circulation area The relative positions of the intake flexible valve plate 322 and the intake port 3123 are uniquely determined by their geometry. Those skilled in the art can calculate different displacements based on conventional fluid dynamics knowledge. It is obtained by the flow cross-sectional area formed between the edge of the lower valve plate and the valve port.

[0049] In one embodiment, the instantaneous flow rate of the fluid injected into the heat exchange module 2 from the outlet 22 satisfies a piecewise function: ; in, The opening displacement of the flexible valve plate 323 is... The instantaneous flow area at time, with Increase and increase, For instantaneous flow, For flow coefficient, For the air outlet 22 flow area, This refers to the displacement of the center point of the flexible valve plate 323 at the outlet. The fluid density is given.

[0050] In one embodiment, dynamic adjustment includes: Collect the temperature of the heat source, the ambient temperature, and / or the air velocity at the air outlet as thermal state parameters; A coupled prediction model is constructed based on historical time-series data of thermal state parameters. The coupled prediction model is used to describe the dynamic coupling relationship between heat load, heat dissipation capacity and environmental conditions. The model predictive control algorithm is adopted to calculate the future temperature change trend based on the coupled predictive model and output the optimal adjustment amount that makes the temperature of the heat source approach the target value. The driving voltage or frequency of the piezoelectric ceramic driver 321 and the power of the thermoelectric cooling module 1 are adjusted synchronously or asynchronously according to the optimal adjustment amount.

[0051] In this embodiment, firstly, the controller collects the heat source temperature, ambient temperature, and / or outlet air velocity as thermal state parameters. Then, based on historical time-series data of these parameters, a coupled prediction model is constructed. This model describes the dynamic coupling relationship between heat load, heat dissipation capacity, and environmental conditions. Next, a model predictive control algorithm is used to calculate the temperature change trend over a future period based on the coupled prediction model, and to optimize the heat source temperature towards a target value, outputting the optimal adjustment amount. Finally, based on this optimal adjustment amount, the driving voltage or frequency of the piezoelectric ceramic driver 321 and the power of the thermoelectric cooling module 1 are adjusted synchronously or asynchronously.

[0052] In one embodiment, it further includes: Determine whether the current operating condition is a steady-state condition or a dynamic condition based on the thermal state parameters; When the condition is determined to be steady-state, model predictive control mode is adopted; When the condition is determined to be dynamic and continues for more than the preset sampling period, the system switches to PID control mode, and the initial output value of PID control mode inherits the last adjustment amount of model prediction control mode before the switch. Once the dynamic operating condition ends and the thermal state parameters stabilize beyond the preset sampling period, the system smoothly reverts to model predictive control mode.

[0053] In this embodiment, the control method also includes an adaptive switching strategy. The controller determines whether the current operating condition is a steady-state condition (smooth heat load) or a dynamic condition (drastic heat load fluctuation) based on the thermal state parameters. When the condition is determined to be steady-state, the aforementioned model predictive control mode is used to achieve high-precision steady-state temperature control. When the condition is determined to be dynamic and continues for more than a preset sampling period (e.g., 0.5 seconds or 1 second), the controller switches to PID control mode to utilize the fast response advantage of PID control to cope with drastic fluctuations. During the switch, the initial output value of the PID control mode inherits the last adjustment amount of the model predictive control mode before the switch, thereby achieving a smooth, shock-free switch. When the dynamic condition ends and the thermal state parameters stabilize again for more than the preset sampling period, the controller smoothly reverts to the model predictive control mode.

[0054] In one embodiment, the heat exchange module 2 is hollow inside, the air inlet 21 of the heat exchange module 2 is opened at the top, the air outlet 22 of the heat exchange module 2 is opened on the side, and the air outlet 22 of the heat exchange module 2 is provided with an inclined surface structure. The heat dissipation control method also includes: accelerating the jet fluid injected into the heat exchange module 2 through the change of cross-sectional area when it flows through the inclined surface structure, so as to project it to the external environment over a long distance.

[0055] In this embodiment, the air outlet 22 of the heat exchange module 2 is provided with an inclined surface structure. The inclined surface structure (e.g., a 30-degree or 45-degree slope) increases the velocity of the fluid flowing through it by gradually reducing the cross-sectional area. This causes the jet fluid injected into the heat exchange module 2 to automatically accelerate as it flows through the inclined surface structure, thereby achieving long-distance projection to the external environment. This helps to remove heat from the device body and avoids hot air backflow.

[0056] In one embodiment, it includes: When a positive voltage is applied to the piezoelectric ceramic drive plate 321, it drives the intake flexible valve plate 322 to deform in a direction away from the air outlet 22, thereby performing the intake process. When a reverse voltage is applied to the piezoelectric ceramic drive plate 321, it drives the intake flexible valve plate 322 to deform towards the outlet 22, thereby performing the air compression process.

[0057] In this embodiment, the driving signal for the piezoelectric ceramic driving plate 321 is an alternating voltage. When a positive voltage is applied, the piezoelectric ceramic driving plate 321 bends in the forward direction, causing the intake flexible valve plate 322 to deform away from the outlet 22, thus performing the intake process. When a reverse voltage is applied, the piezoelectric ceramic driving plate 321 bends in the reverse direction, causing the intake flexible valve plate 322 to deform towards the outlet 22, thus performing the compression process. The outlet flexible valve plate 323 does not receive any active driving signal throughout the entire process; it passively opens and closes entirely based on pressure changes within the compression chamber 33, thereby improving the system's reliability.

[0058] In this invention, the outlet 22 of the piezoelectric driven fluid module 3 is aligned with the inlet 21 of the heat exchange module 2, such that the jet ejected from the outlet 22 is substantially perpendicular to the inner wall of the heat exchange module 2. This vertical impact jet method can effectively break the thermal boundary layer on the inner wall of the heat exchange module 2, reduce thermal resistance, and thus significantly improve the convective heat transfer coefficient, achieving efficient heat dissipation.

[0059] To improve heat transfer efficiency, thermally conductive interface materials, such as thermally conductive silicone grease, thermally conductive pads, or phase change thermally conductive materials, are filled between the cold end of the thermoelectric cooling module 1 and the heat source, as well as between the hot end of the thermoelectric cooling module 1 and the heat exchange module 2. These materials can fill the microscopic gaps between the contact surfaces and reduce contact thermal resistance.

[0060] The heat exchange module 2 is constructed with a hollow interior, with its air inlet 21 located at the top to facilitate receiving the vertical jet from the piezoelectrically driven fluid module 3 above; its air outlet 22 is located on the side to discharge the heat-absorbing fluid. This vertical-side layout of the air inlet and outlet 22 is beneficial for forming an efficient heat exchange path.

[0061] In a highly integrated, miniaturized embodiment, the piezoelectric driven fluid module 3 and the heat exchange module 2 are stacked to form a flat heat dissipation structure. For example, the overall size of the entire heat dissipation control device can be as small as 40mm x 40mm, and the total height of the piezoelectric driven fluid module 3 and the heat exchange module 2 is only about 6mm. This flat structure is very suitable for space-constrained compact electronic devices, such as ultra-thin laptops, tablets, or high-power-density server modules.

[0062] The working principle of this invention is as follows: In the initial state, when the piezoelectric ceramic drive plate 321 is not energized within the piezoelectric jet module, the base 311, sealing top cover 312, inlet flexible valve plate 322, and outlet flexible valve plate 323 together form a sealed compressed air chamber 33. During operation, the controller sends an alternating drive signal. Under positive voltage drive, the inlet flexible valve plate 322 bends upward, the volume of the compressed air chamber 33 expands, the pressure drops, and external cooling fluid is drawn into the chamber. At this time, the outlet flexible valve plate 323 remains closed under the action of negative pressure and its own pre-tightening force. Subsequently, the drive signal switches to reverse voltage, the inlet flexible valve plate 322 bends downward, compressing the fluid in the chamber, and the chamber pressure rises sharply. When the pressure exceeds the opening threshold of the outlet flexible valve plate 323, the outlet flexible valve plate 323 is forced open, and the high-pressure fluid is vertically injected into the heat exchange module 2 in the form of a high-speed jet, impacting the inner wall of the heat exchange module 2. Simultaneously, the thermoelectric cooling module 1 pumps the heat from the heat source to the wall of the heat exchange module 2, where it is carried away by the impinging jet. The fluid that has absorbed heat is accelerated and discharged through the inclined air outlet 22 on the side of the heat exchange module 2. The controller monitors the thermal state in real time through temperature and wind speed sensors and dynamically adjusts the piezoelectric drive frequency / voltage and thermoelectric cooling power to adapt to real-time changes in heat load.

[0063] The above process repeats periodically, forming a continuous heat dissipation cycle.

[0064] like Figures 2 to 10 As shown, a heat dissipation control device based on the synergistic coupling of piezoelectric jet and thermoelectric cooling includes: The thermoelectric cooling module 1 has a cold end that is used to contact the heat source, and a hot end that is in contact with the heat exchange surface of the heat exchange module 2. The heat exchange module 2 has an air inlet 21 that communicates with the air outlet 3114; The piezoelectric driven fluid module 3 includes a housing 31 having at least one compressed air chamber 33 and a control component 32 corresponding to the compressed air chamber 33. The housing 31 has at least one air inlet 3123 and a plurality of air outlets 3114 corresponding to the compressed air chamber 33. The control component 32 includes a piezoelectric ceramic drive plate 321, an air inlet flexible valve plate 322, and an air outlet flexible valve plate 323 disposed at the air outlets 3114.

[0065] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the invention and are protected by patent law.

Claims

1. A heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling, characterized in that, An application is made in a heat dissipation control device, which includes a thermoelectric cooling module, a heat exchange module, and a piezoelectric driven fluid module. The cold end of the thermoelectric cooling module is used to contact a heat source, and its hot end is in contact with the heat exchange surface of the heat exchange module. The piezoelectric driven fluid module includes a shell forming at least one compressed air chamber, an inlet flexible valve plate, an outlet flexible valve plate, and a piezoelectric ceramic driving plate. The shell is provided with at least one inlet and multiple outlet holes corresponding to the compressed air chamber. The heat exchange module has an inlet hole communicating with the outlet holes. The heat dissipation control method includes the following steps: The piezoelectric ceramic driving plate is controlled to drive the intake flexible valve plate to produce periodic bending deformation, thereby changing the volume of the compression chamber, so that the compression chamber alternately performs the intake process and the compression process; During the air compression process, when the pressure difference between the air compression chamber and the external environment reaches the opening threshold determined by the pre-tightening force and effective pressure area of ​​the outlet flexible valve plate, the outlet flexible valve plate passively undergoes opening deformation, causing the cooling fluid in the air compression chamber to be injected into the air inlet of the heat exchange module through the outlet hole in the form of an impact jet perpendicular to the heat exchange surface of the heat exchange module. The heat from the heat source is absorbed by the cold end of the thermoelectric cooling module, and the heat is transferred to the hot end of the thermoelectric cooling module. The heat is then transferred to the heat exchange module via the hot end and carried away by the cooling fluid injected from the air inlet of the heat exchange module. The thermal state parameters of the heat dissipation control device are acquired in real time, and the power of the thermoelectric cooling module and / or the driving voltage or frequency of the piezoelectric ceramic driving plate are dynamically adjusted according to the thermal state parameters so that the flow rate and velocity of the impinging jet and the cooling capacity of the thermoelectric cooling module are coordinated to match the heat load changes of the heat source.

2. The heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling according to claim 1, characterized in that, During the intake process, the pressure in the compressed air chamber is lower than the external ambient pressure, and the flexible valve plate at the outlet remains closed under the action of external pressure to prevent external fluid from flowing back from the outlet. During the air compression process, when the pressure in the air compression chamber rises until it exceeds the opening threshold, the outlet flexible valve plate is passively opened to establish a one-way jet channel from the air compression chamber to the heat exchange module.

3. The heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling according to claim 1, characterized in that, The opening threshold satisfies the condition that the pressure difference between the inside and outside of the compressed air chamber is greater than or equal to the ratio of the preload of the flexible valve plate to its effective pressure-bearing area.

4. The heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling according to claim 1, characterized in that, The dynamic behavior of the drive unit, which consists of the intake flexible valve plate and the piezoelectric ceramic drive plate, is determined by its equivalent mass, damping coefficient, equivalent stiffness, and piezoelectric coefficient. The dynamics of the passive opening process of the flexible valve disc are determined by its equivalent mass, damping coefficient, equivalent stiffness, effective pressure area, and preload.

5. The heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling according to claim 1, characterized in that, The dynamic adjustment includes: The temperature of the heat source, the ambient temperature, and / or the air velocity at the air outlet are collected as the thermal state parameters. A coupled prediction model is constructed based on the historical time-series data of the thermal state parameters. The coupled prediction model is used to describe the dynamic coupling relationship between heat load, heat dissipation capacity and environmental conditions. The model predictive control algorithm is used to calculate the future temperature change trend based on the coupled predictive model, and output the optimal adjustment amount that makes the temperature of the heat source approach the target value. The driving voltage or frequency of the piezoelectric ceramic driving plate and the power of the thermoelectric cooling module are adjusted synchronously or asynchronously according to the optimal adjustment amount.

6. The heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling according to claim 5, characterized in that, Also includes: Based on the thermal state parameters, determine whether the current operating condition is a steady-state condition or a dynamic condition; When the condition is determined to be steady-state, model predictive control mode is adopted; When the condition is determined to be dynamic and continues for more than the preset sampling period, the system switches to PID control mode, and the initial output value of the PID control mode inherits the last adjustment amount of the model prediction control mode before the switch. Once the dynamic operating condition ends and the thermal state parameters stabilize beyond the preset sampling period, the system smoothly reverts to model predictive control mode.

7. The heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling according to claim 1, characterized in that, The heat exchange module is hollow inside, with the air inlet at the top and the air outlet at the side, and the air outlet having an inclined surface structure. The heat dissipation control method further includes: accelerating the jet fluid injected into the heat exchange module through cross-sectional area changes as it flows through the inclined surface structure, so as to project it to the external environment over a long distance.

8. The heat dissipation control method based on the synergistic coupling of piezoelectric jet and thermoelectric cooling according to claim 1, characterized in that, When a positive voltage is applied to the piezoelectric ceramic driving plate, it drives the intake flexible valve plate to deform in a direction away from the air outlet, thereby performing the air intake process. When a reverse voltage is applied, the piezoelectric ceramic driving plate drives the intake flexible valve plate to deform towards the outlet, thereby performing the air compression process.

9. A heat dissipation control device based on the synergistic coupling of piezoelectric jet and thermoelectric cooling, characterized in that, include: A thermoelectric cooling module, wherein the cold end is used to contact the heat source, and the hot end is in contact with the heat exchange surface of the heat exchange module; The heat exchange module has an air inlet that communicates with the air outlet. A piezoelectric driven fluid module includes a housing having at least one compressed air chamber and a control component disposed corresponding to the compressed air chamber. The housing is provided with at least one air inlet and multiple air outlets corresponding to the compressed air chamber. The control component includes a piezoelectric ceramic drive plate, an air inlet flexible valve plate, and an air outlet flexible valve plate disposed at the air outlets. The flexible valve plate has a preset preload. The flexible valve plate is passively opened only when the difference between the pressure in the compressed air chamber and the external ambient pressure is greater than or equal to the ratio of the preload to the effective pressure-bearing area of ​​the flexible valve plate. This allows the cooling fluid to be sprayed into the heat exchange module in an impact jet pattern perpendicular to the heat exchange surface of the heat exchange module. The housing includes a base and a sealed top cover. The base is provided with a first limiting block and a second limiting block, and the sealed top cover is provided with a third limiting block. The inlet flexible valve plate and the piezoelectric ceramic drive plate are installed in the first fixing slot of the first limiting block, and the outlet flexible valve plate is installed in the second fixing slot of the second limiting block. The third limiting block is provided with a limiting space for limiting the opening range of the outlet flexible valve plate.

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