Loop heat pipe heat dissipation device
By designing a loop heat pipe evaporator with a multi-material liquid-absorbing core and a Tesla valve structure, the problem of small evaporation area in traditional loop heat pipes has been solved, achieving efficient and stable heat dissipation for multiple heat-generating devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-03-06
AI Technical Summary
The traditional loop heat pipe evaporator design results in a small evaporation area, which cannot meet the heat dissipation requirements of many high-power electronic heating devices.
The design incorporates multiple evaporators, each with a liquid storage chamber and a vapor chamber connected along its thickness. It employs a multi-material liquid wick and a Tesla valve structure to increase the evaporation area and prevent heat leakage. The condensers are arranged vertically to enhance heat dissipation circulation.
It achieves stable heat dissipation for multiple heat-generating components, increases the contact area between the evaporator and the heat-generating components, reduces the space occupied, and improves heat dissipation efficiency and stability.
Smart Images
Figure CN223976516U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of loop heat pipe heat dissipation technology, and in particular to a loop heat pipe heat dissipation device. Background Technology
[0002] Loop heat pipes offer advantages such as long heat transfer distance, rapid heat transfer, and resistance to gravity, leading to their widespread use in electronic heat dissipation and aerospace applications. Traditional loop heat pipes are primarily designed for single evaporators, which typically employ circular tubular or plate-like structures. To maintain stable evaporator operation, the external liquid storage area occupies a large space, resulting in a small evaporation area. This structural design cannot meet the heat dissipation requirements of many high-power electronic heating devices. Utility Model Content
[0003] The main purpose of this invention is to propose a loop heat pipe heat dissipation device that can handle heat dissipation scenarios involving multiple heat-generating devices.
[0004] To achieve the above objectives, this utility model proposes a loop heat pipe heat dissipation device, comprising:
[0005] Multiple evaporators, each evaporator having a liquid storage chamber and a vapor chamber connected in the thickness direction, the liquid storage chamber for storing a cooling medium, and the vapor chamber for storing vapor formed by the evaporation of the cooling medium;
[0006] Multiple piping structures are provided, each corresponding to one of the multiple evaporators. Each piping structure includes a liquid piping and a steam piping. The steam piping communicates with multiple steam chambers, and the liquid piping communicates with multiple liquid storage chambers; and...
[0007] A condenser having an air inlet and a liquid outlet spaced apart, the air inlet being connected to the steam pipeline and the liquid outlet being connected to the liquid pipeline;
[0008] The steam discharged from the multiple steam chambers is collected and enters the condenser. The cooling medium generated by the condenser is mixed and then sent to the multiple liquid storage chambers.
[0009] In one embodiment, the evaporator includes:
[0010] case;
[0011] A partition plate is disposed in the inner cavity of the housing to divide the inner cavity of the housing into the liquid storage cavity and the vapor cavity. The partition plate is annular and has a liquid inlet channel connecting the liquid storage cavity and the vapor cavity.
[0012] The liquid-absorbing core is attached to the inner wall of the partition plate and connected to the liquid inlet channel to absorb the cooling medium introduced by the liquid storage chamber.
[0013] In one embodiment, the absorbent core includes a plurality of absorbent core bodies, at least some of which are made of different materials.
[0014] In one embodiment, the plurality of liquid-absorbing cores include a first liquid-absorbing core and a plurality of second liquid-absorbing cores. The first liquid-absorbing core is arranged in a ring shape, attached to the inner side of the partition plate and connected to the liquid inlet channel. The plurality of second liquid-absorbing cores are spaced apart on the inner side of the first liquid-absorbing core. The two opposite ends of each second liquid-absorbing core along its length direction are abutted against the first liquid-absorbing core to communicate with the first liquid-absorbing core.
[0015] In one embodiment, the housing includes two end plates disposed opposite to each other, each end plate having a recessed groove on its side facing each other, the two grooves covering each other to form the inner cavity, the two walls of the partition plate along the thickness direction respectively abutting against the two groove walls, the outer wall of the partition plate and one of the groove walls forming the liquid storage cavity, and the inner wall of the partition plate and the other groove wall forming the evaporation cavity.
[0016] In one embodiment, the peripheral edge of the partition plate is provided with a plurality of Tesla valve structures to jointly form the liquid inlet channel, and the two ports of each Tesla structure respectively penetrate the inner wall and the outer side of the partition plate;
[0017] The peripheral edge of the liquid-absorbing core is attached to the inner wall of the partition plate and is connected to the ports of multiple Tesla valve structures.
[0018] In one embodiment, the liquid-absorbing core is positioned to cover the heating element along the thickness direction of the evaporator.
[0019] In one embodiment, the condenser includes:
[0020] A housing, the inner cavity of which is filled with coolant; and,
[0021] An extension tube is provided in the inner cavity of the outer shell. The extension tube is formed by multiple tube segments arranged vertically at intervals and connected end to end. The two ends of the extension tube form the air inlet and the liquid outlet.
[0022] In one embodiment, the condenser is positioned vertically above the plurality of evaporators.
[0023] In one embodiment, the loop heat pipe cooling device further includes a steam header, which connects to the plurality of steam pipes and the air inlet of the condenser to collect steam from the plurality of steam pipes and guide it to the condenser; and / or,
[0024] The loop heat pipe cooling device further includes a liquid manifold, which connects to multiple liquid pipes and the liquid outlet of the condenser to collect the cooling medium and then redistribute it to the multiple liquid pipes. The liquid manifold is provided with an opening that can be opened and closed. Base;
[0025] In this invention, multiple evaporators can work together to dissipate heat from multiple heating elements. Each evaporator has a corresponding liquid storage chamber on one side for contact with the heating element. Heat from the surface of the heating element is conducted to the cooling medium within the liquid storage chamber. The cooling medium evaporates to form steam, which is stored in the evaporation chamber. Multiple evaporators are connected in parallel, and the steam is jointly transported to the condenser. The condensed cooling medium is then redistributed to the multiple evaporators, forming a heat dissipation cycle that ensures stability under high-load operation of multiple chips. Furthermore, the evaporator's structural design integrates the liquid storage chamber and the steam chamber. The thickness-oriented arrangement increases the contact area between the evaporator and the heating element while reducing the space occupied by the evaporator. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0027] Figure 1 A schematic diagram of an embodiment of the loop heat pipe heat dissipation device provided by this utility model;
[0028] Figure 2 for Figure 1 Exploded view of the evaporator;
[0029] Figure 3 for Figure 2 Schematic diagram of the middle partition plate;
[0030] Figure 4 is Figure 3 A magnified schematic diagram of part A in the middle;
[0031] Figure 4(a) is a schematic diagram of the Tesla valve structure;
[0032] Figure 4(b) is a schematic diagram of the liquid flow direction inside the Tesla valve structure;
[0033] Figure 4(c) is a schematic diagram of the Tesla valve mechanism for preventing backflow.
[0034] Figure 5 for Figure 1 Schematic diagram of the cross-section of the evaporator;
[0035] Figure 6 for Figure 1 Schematic diagram of the intermediate condenser;
[0036] Figure 7 for Figure 1 A schematic diagram of the structure of the liquid header and condenser working together.
[0037] Explanation of icon numbers:
[0038] 100. Loop heat pipe cooling device; 1. Evaporator; 11. Shell; 111. End plate; 12. Divider plate; 121. Tesla valve structure; 131. First liquid suction core; 132. Second liquid suction core; 1a. Liquid storage chamber; 1b. Steam chamber; 21. Liquid pipeline; 22. Steam pipeline; 3. Condenser; 3a. Air inlet; 3b. Liquid outlet; 31. Shell; 31a. Coolant inlet; 31b. Coolant outlet; 32. Extension pipe; 4. Steam header; 5. Liquid header; 51. Opening.
[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0041] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0042] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0043] Please refer to Figure 1 , Figure 2 and Figure 5 The loop heat pipe heat dissipation device 100 includes multiple evaporators 1, multiple pipe structures, and a condenser 3. Each evaporator 1 has a liquid storage chamber 1a and a steam chamber 1b connected along its thickness direction. The liquid storage chamber 1a is used to store the cooling medium, and the steam chamber 1b is used to store the steam formed by the evaporation of the cooling medium. Each evaporator 1 is configured to correspond to the multiple evaporators. Each pipe structure includes a liquid pipe 21 and a steam pipe 22. The steam pipe 22 is connected to the multiple steam chambers 1b, and the liquid pipe 21 is connected to the multiple liquid storage chambers 1a. The condenser 3 has an air inlet 3a and a liquid outlet 3b arranged at intervals. The air inlet 3a is connected to the steam pipe 22, and the liquid outlet 3b is connected to the liquid pipe 21. The steam discharged from the multiple steam chambers 1b is collected and enters the condenser 3. The cooling medium generated by the condenser 3 is mixed and then sent to the multiple liquid storage chambers 1a.
[0044] In this invention, multiple evaporators 1 can provide heat dissipation for multiple heating devices. Each evaporator 1 has a corresponding side forming a liquid storage chamber 1a for contact with the heating device. The heat from the surface of the heating device is conducted through heat transfer to the liquid cooling medium in the liquid storage chamber 1a. When the cooling medium reaches the required temperature, it evaporates to form steam, which is stored in the evaporation chamber 1b. The multiple evaporators 1 are connected in parallel, and the steam is jointly transported to the condenser 3. After condensation, the cooling medium is redistributed to the multiple evaporators 1, thus forming a heat dissipation cycle. This ensures stability under high-load operation conditions of multiple chips. Furthermore, the structural design of the evaporator 1 integrates the liquid storage chamber 1a and the steam chamber 1b together. The thickness-oriented arrangement increases the contact area between the evaporator 1 and the heating device while reducing the space occupied by the evaporator 1.
[0045] For the selection of heat transfer medium used for circulating heat dissipation, a solution with a suitable boiling point can be used according to reasonable requirements, such as ethanol, acetone, propylene glycol, etc. In this embodiment, a mixture of acetone and ethanol is used as the heat transfer medium.
[0046] Specifically, each evaporator 1 includes a shell 11, a partition plate 12, and a liquid suction core. The partition plate 12 is disposed in the inner cavity of the shell 11 to divide the inner cavity of the shell 11 into a liquid storage chamber 1a and a vapor chamber 1b. The partition plate 12 is annular and has a liquid inlet channel connecting the liquid storage chamber 1a and the vapor chamber 1b. The liquid suction core is attached to the inner wall of the partition plate 12 and is connected to the liquid inlet channel to absorb the cooling medium introduced from the liquid storage chamber 1a. The surface of the shell 11 is in direct contact with the heating element. The space is divided by the partition plate 12. The working medium in the liquid storage chamber 1a is absorbed by the liquid suction core through the liquid inlet channel. The heat generated when the heating element is working is conducted to the liquid suction core, causing the cooling medium in the liquid suction core to evaporate rapidly to form steam. The steam is stored in the vapor chamber 1b. The suction force of the liquid suction core forms the circulation power of the evaporator 1.
[0047] Considering the potential risk of heat leakage with a single-material absorbent core, in some embodiments, the absorbent core comprises multiple absorbent core bodies, at least some of which are made of different materials. Regarding the choice of materials, highly dense materials, such as sintered copper, or high thermal resistance materials, such as PTFE, can be used. It should be understood that the structure of absorbent core bodies made of different materials is not limited; they can have the same structure or different structures based on the characteristics of different materials.
[0048] In this embodiment, the plurality of liquid-absorbing cores include a first liquid-absorbing core 131 and a plurality of second liquid-absorbing cores 132. The first liquid-absorbing core 131 is arranged in a ring shape and is embedded in the inner side of the partition plate 12 and connected to the liquid inlet channel. It should be understood that at this time, the first liquid-absorbing core 131 is in contact with the inner wall of the partition plate 12, and the plurality of second liquid-absorbing cores 132 are spaced apart on the inner side of the first liquid-absorbing core 131. The two ends of each second liquid-absorbing core 132 along its length direction are pressed against the first liquid-absorbing core 131 to communicate with the first liquid-absorbing core 131. Along the thickness direction of the evaporator 1, the sides of the first liquid-absorbing core 131 and the second liquid-absorbing core 132 facing away from the liquid storage chamber 1a are both attached to the inner wall of the shell 11. The first liquid-absorbing core 131 and the second liquid-absorbing core 132 enclose and form multiple channel structures. The purpose of the first liquid-absorbing core 131 is to prevent heat leakage and cause the liquid-absorbing core to dry out. Its material can be a material with a large thermal resistance to suppress heat transfer, such as a high thermal resistance material with a thermal conductivity of 0.2 W / (m·k). The purpose of the second liquid-absorbing core 132 is to provide a large circulation force to drive the circulation flow of the entire system. Liquid enters the evaporator 1 and first connects with the first liquid-absorbing core 131 through the liquid inlet channel. Since the first and second liquid-absorbing cores 131 and 132 are fitted together, the liquid permeates the first liquid-absorbing core 131 and then enters the second liquid-absorbing core 132. The channel structure formed between each pair of adjacent second liquid-absorbing cores 132 is a steam channel. After some liquid medium permeates the second liquid-absorbing core 132 and enters the steam channel, it is heated and evaporates, finally flowing into the steam pipe 22 from the corresponding steam outlet of the evaporator 1. The material of the second liquid-absorbing core 132 can be sintered copper.
[0049] It should be noted that in other embodiments, the first absorbent core 131 and the second absorbent core 132 may be selected from different materials according to actual needs.
[0050] To facilitate internal structural design, the housing 11 can consist of a bottom shell with a cavity and end caps for closing. In some embodiments, the housing 11 includes two opposing end plates 111, each with recessed grooves on its sides facing each other. The two grooves close together to form the inner cavity of the housing 11. Two walls of a partition plate 12 along its thickness direction abut against the walls of the two grooves. The outer wall of the partition plate 12 forms a liquid storage cavity 1a with one of the groove walls, and the inner wall of the partition plate 12 forms an evaporation cavity 1b with the other groove wall. The two end plates 111 are assembled by splicing. The partition plate 12 can be welded to one of the end plates 111, or it can be assembled. To ensure good sealing of the liquid storage cavity 1a, it is preferable to weld the partition plate 12 to the corresponding end plate 111. Accordingly, through holes can be opened on the side walls of each groove to serve as liquid inlets or vapor outlets.
[0051] To prevent liquid or vapor from flowing back from the vapor chamber 1b into the liquid storage chamber 1a, the liquid inlet channel should be configured for one-way inlet, meaning that only liquid from the liquid storage chamber 1a is allowed to be drawn into the suction core through the liquid inlet channel. In some embodiments, a one-way valve can be installed in the liquid inlet channel to achieve this. In this embodiment, please refer to... Figure 3 As shown in Figure 4, multiple Tesla valve structures 121 are arranged on the peripheral edge of the partition plate 12 to form a liquid inlet channel. The two ports of each Tesla structure 121 penetrate the inner and outer walls of the partition plate 11, respectively. The peripheral edge of the suction core is fitted against the inner wall of the partition plate 11 and connects to one port of each Tesla valve structure 121. The Tesla valve structure 121 controls the unidirectional flow of internal fluid without any moving parts by setting the flow channels into a repeating, fixed assembly shape. Due to the unidirectional flow characteristics of the Tesla valve structure 121, heat leakage and gas-liquid mixing can be minimized, improving the ultimate heat transfer efficiency of the loop heat pipe, while also saving space and reducing the number of components.
[0052] Specifically, the Tesla valve structure can be understood as a fluid channel composed of a direct flow path and a curved flow path, as shown in Figure 4(a). The normal flow state of the liquid is shown in Figure 4(b). The liquid flows into the Tesla valve from the top, and a portion of the liquid flows into the curved flow path, where it mixes with the fluid in the direct flow path. During the mixing process, the projections of the two fluid flow directions onto the Y-axis are in the same direction, allowing the liquid to flow smoothly. When the liquid flows into the Tesla valve from the bottom, as shown in Figure 4(c), the liquid is divided into two streams. When the liquid entering the curved flow path mixes with the liquid entering the direct flow path, the projections of the two fluid flow directions onto the Y-axis are opposite, causing vortices to form at the mixing point and hindering further liquid flow. Therefore, the liquid loses a significant amount of energy with each mixing process. In this technical solution, this principle is used to effectively prevent liquid backflow.
[0053] Based on the above embodiment, along the thickness direction of the evaporator 1, the projected area of the steam chamber 1b is smaller than the projected area of the liquid storage chamber 1a. That is, the cross-sectional area of the steam chamber 1b is smaller than the cross-sectional area of the liquid storage chamber 1a. This arrangement provides a transition space when the steam chamber 1b and the liquid storage chamber 1a are connected, which can mitigate the adverse effects caused by a large liquid inflow.
[0054] When the housing 11 is composed of two end plates 111, the groove sizes on the two end plates 111 are different.
[0055] Furthermore, the projection of the liquid-absorbing core along the thickness direction of the evaporator 1 should be able to cover the heating element, thereby ensuring that the heat from the heating element can be concentrated and transferred, thus achieving the optimal evaporation efficiency.
[0056] For further details, please refer to Figure 6 The condenser 3 includes a housing 31 and an extension pipe 32. The inner cavity of the housing 31 is filled with coolant. The extension pipe 32 is disposed within the inner cavity of the housing 31 and is at least partially immersed in the coolant. The extension pipe 32 consists of multiple pipe segments arranged vertically at intervals and connected end to end. Each pipe segment extends horizontally, and depending on the arrangement direction, it can be either transverse or longitudinal. An air inlet 3a and a liquid outlet 3b are formed at both ends of the extension pipe 32. A coolant inlet 31a and a coolant outlet 31b are provided on the housing 31 to allow for the filling and discharge of coolant, ensuring that the temperature of the coolant inside the condenser 3 always meets the heat exchange requirements.
[0057] Cooling water is stored inside the outer casing 31 and covers the outside of the extension tube 32. The steam entering the extension tube 32 exchanges heat with the cooling medium. The steam condenses into a liquid working fluid and flows out through the liquid outlet, then enters the liquid pipeline 21 and flows into the evaporator 1. The serpentine arrangement of the extension tube 32 increases the flow distance and the heat exchange area, thereby improving the condensation effect of the condenser 3. Each tube section is vertically arranged, that is, the condenser 3 as a whole is placed vertically, which can utilize gravity to improve the start-up characteristics of the loop heat pipe.
[0058] Specifically, the start-up of the loop heat pipe requires a sufficiently large temperature difference between the evaporator 1 and the condensing medium to offset the saturation pressure difference that causes the working fluid flow pressure loss, thereby achieving positive circulation of the working fluid, as shown in the following equation:
[0059]
[0060] Δp ex =Δp gr +Δp vl +Δp cond +Δp u +Δp g
[0061] In the formula:
[0062] P v p represents the saturation pressure inside the evaporator, in Pa. cc The saturation pressure inside the storage chamber is expressed in Pa; t v The saturation temperature inside the evaporator, in °C; t cc The saturation temperature inside the storage chamber is expressed in °C; Δp ex The external voltage drop of the circuit is expressed in Pa; Δp gr The pressure drop in the steam chamber is expressed in Pa; Δp vl The pressure drop across the gas line is expressed in Pa; Δp cond The pressure drop across the condenser line is expressed in Pa; Δp u The pressure drop across the liquid line is expressed in Pa; Δp g Pressure drop due to gravity, unit: Pa; d p / d t It represents the rate of change of an object's momentum.
[0063] As shown by the two formulas, flow along the direction of gravity can reduce the pressure drop in the loop, decrease the temperature difference required for startup, and facilitate startup under low-heat conditions. In this system, condenser 3 is arranged downwards along gravity, and condenser 3 is positioned vertically higher than the multiple evaporators 1. After condensation, the liquid is subjected to gravity, which can offset this pressure difference loss, providing conditions for the loop heat pipe to start up.
[0064] Furthermore, considering that when multiple evaporators 1 are supplying steam, the multiple steam pipelines 22 supply steam independently to each other, therefore, in some embodiments, please refer again to... Figure 1 The loop heat pipe heat dissipation device 100 also includes a steam header 4, which connects multiple steam pipes 22 to the air inlet 3a of the condenser 3, collecting the steam from the multiple steam pipes 22 and guiding it into the condenser 3. Specifically, multiple steam pipes 22 are provided in a one-to-one correspondence with the evaporators 1, with each evaporator 1 connected to one steam pipe 22. The steam pipes 22 are connected to the side end of the steam header 4, thereby collecting the steam through the steam header 4. The steam header 4 can improve the unevenness of steam flow within the condenser 3.
[0065] In this embodiment, two evaporators 1 are provided, and two steam pipes 22 corresponding to the two evaporators 1 are respectively connected to the opposite ends of the steam header 4.
[0066] Please refer to Figure 1 and Figure 7The loop heat pipe cooling device 100 also includes a liquid manifold 5, which connects to multiple liquid pipes 21 and the outlet 3b of the condenser 3 to collect the cooling medium and then redistribute it to the multiple liquid pipes 21. The liquid manifold 5 is provided with an opening 51 that can be opened and closed. There are multiple liquid pipes 21, which are arranged one-to-one with multiple evaporators 1. One end of each liquid pipe 21 is connected to the liquid manifold 5, and the other end is connected to the corresponding evaporator 1, so as to facilitate the centralized distribution of the cooling medium after collection. Specifically, after the steam is condensed, it enters the liquid manifold 5, and the flow rate can be distributed according to the power consumption of each heat-generating device. The opening 51 can be used as a liquid inlet or an exhaust outlet.
[0067] It should be understood that, depending on the actual setup requirements, only one of the steam header 4 and the liquid header 5 may be installed, or both may be installed simultaneously.
[0068] In this invention, multiple evaporators 1 are connected in parallel to address heat dissipation scenarios involving multiple heat-generating devices, enabling rapid response to heat transfer. Inside each evaporator 1, the liquid storage section and the evaporation section are separated by a wick and a partition plate 12. The partition plate 12 has multiple rows of Tesla valve structures 121. Due to the unidirectional flow characteristics of the Tesla valve structures 121, heat leakage is minimized, and steam is prevented from entering the liquid storage chamber 1a, thus preventing gas-liquid mixing and improving the ultimate heat transfer efficiency of the loop heat pipe. The use of multi-material wicks avoids heat leakage within the evaporator 1, further enhancing the ultimate heat transfer capacity of the loop heat pipe. During chip operation, the device transfers heat from the chip to the condenser end through phase change heat transfer of the working medium. The steam condenses at the condenser end and flows back into the evaporator 1, achieving a heat dissipation cycle and ensuring stability under high-load operation conditions of multiple CPUs.
[0069] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.
Claims
1. A loop heat pipe heat dissipating device, characterized by, include: Multiple evaporators, each evaporator having a liquid storage chamber and a vapor chamber connected in the thickness direction, the liquid storage chamber for storing a cooling medium, and the vapor chamber for storing vapor formed by the evaporation of the cooling medium; Multiple piping structures are provided, each corresponding to one of the multiple evaporators. Each piping structure includes a liquid piping and a steam piping. The steam piping communicates with the steam chamber, and the liquid piping communicates with the liquid storage chamber. A condenser having an air inlet and a liquid outlet spaced apart, the air inlet being connected to the steam pipeline and the liquid outlet being connected to the liquid pipeline; The steam discharged from the multiple steam chambers is collected and enters the condenser. The cooling medium generated by the condenser is mixed and then sent to the multiple liquid storage chambers.
2. The loop heat pipe thermal device of claim 1, wherein The evaporator includes: case; A partition plate is disposed in the inner cavity of the housing to divide the inner cavity of the housing into the liquid storage cavity and the vapor cavity. The partition plate is annular and has a liquid inlet channel connecting the liquid storage cavity and the vapor cavity. A liquid-absorbing core is attached to the inner wall of the partition plate and connected to the liquid inlet channel to absorb the cooling medium in the liquid storage chamber.
3. The loop heat pipe thermal device of claim 2, wherein The absorbent core includes multiple absorbent core bodies, and at least some of the absorbent core bodies are made of different materials.
4. The loop heat pipe thermal device of claim 3, wherein The plurality of liquid-absorbing cores include a first liquid-absorbing core and a plurality of second liquid-absorbing cores. The first liquid-absorbing core is arranged in a ring and is attached to the inner side of the partition plate and connected to the liquid inlet channel. The plurality of second liquid-absorbing cores are spaced apart on the inner side of the first liquid-absorbing core. The two opposite ends of each second liquid-absorbing core along its length direction are pressed against the first liquid-absorbing core to communicate with the first liquid-absorbing core.
5. The loop heat pipe thermal device of claim 2, wherein The housing includes two end plates arranged opposite each other, and each of the two end plates has a recessed groove on its side facing each other. The two grooves cover each other to form the inner cavity. The two walls of the partition plate along the thickness direction abut against the groove walls of the two grooves respectively. The outer wall of the partition plate and one of the groove walls form the liquid storage cavity, and the inner wall of the partition plate and the other groove wall form the vapor cavity.
6. The loop heat pipe thermal device of claim 2, wherein, The partition plate is provided with multiple Tesla valve structures on its peripheral edge to form the liquid inlet channel. The two ports of each Tesla valve structure respectively penetrate the inner wall and outer side of the partition plate. The peripheral edge of the liquid-absorbing core is in contact with the inner wall of the partition plate and is connected to the ports of multiple Tesla valve structures.
7. The heat pipe heat sink of any of claims 2 to 6, wherein The liquid-absorbing core is positioned to cover the heating element along the thickness direction of the evaporator.
8. The loop heat pipe thermal device of claim 1, wherein The condenser includes: A housing, the inner cavity of which is filled with coolant; and, An extension tube is provided in the inner cavity of the outer shell. The extension tube is formed by multiple tube segments arranged vertically at intervals and connected end to end. The two ends of the extension tube form the air inlet and the liquid outlet.
9. The loop heat pipe thermal device of claim 1 or 8, wherein, The condenser is positioned vertically above the plurality of evaporators.
10. The loop heat pipe thermal device of claim 1, wherein The loop heat pipe heat dissipation device further comprises a vapor header communicating with the plurality of vapor pipelines and an inlet of the condenser to collect the vapor in the plurality of vapor pipelines and then guide the vapor into the condenser; and / or, The loop heat pipe heat dissipation device further comprises a liquid header communicating with the plurality of liquid pipelines and a liquid outlet of the condenser to collect the cooling medium and then distribute the cooling medium into the plurality of liquid pipelines, and the liquid header is provided with an openable and closable opening.