An asymmetric vein-type fin microchannel condenser and a multi-evaporator loop heat pipe

Abstract

The present invention discloses an asymmetric vein-type fin microchannel condenser and a multi-evaporator loop heat pipe. The multi-evaporator loop heat pipe includes multiple gas pipelines, multiple liquid pipelines, multiple evaporators and a condenser; the multiple evaporators are connected in parallel with the steam chamber of the condenser through multiple gas pipelines, and the multiple evaporators are also connected in parallel with the condensate chamber of the condenser through multiple liquid pipelines. The loop heat pipe with multiple evaporators and a single condenser of the present invention realizes a loop heat pipe in which one condenser drives multiple evaporators to work through a novel condenser and evaporator structures with ingenious design concept and reasonable structure, ensures the heat dissipation efficiency, meets the miniaturization requirements, can be flexibly installed according to the number and position of heating elements, and can select different heat dissipation modes according to the needs of different heat dissipation loads, avoiding waste of energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal control, and particularly relates to an asymmetric vein-type fin microchannel condenser and a multi-evaporator loop heat pipe. Background Art

[0002] Nowadays, the high heat dissipation problems brought about by the light miniaturization and high integration of electronic devices and equipment have become the key factors restricting and affecting the further development of fields such as aerospace, new energy development, and integrated circuits. Therefore, as one of the most effective heat exchange devices, heat pipes play an increasingly important role. It is a two-phase heat transfer component with high heat transfer capacity, consisting of an evaporation section, a condensation section, and an adiabatic section. The working fluid absorbs heat in the evaporation section, turns into steam, then releases heat in the condensation section, and the condensate returns to the evaporation section under the action of the capillary wick. Traditional heat pipes are widely used due to their high thermal conductivity and passive cooling, etc., but they have problems such as coolant leakage and inability to meet long-distance transportation.

[0003] The emergence of the Loop Heat Pipe (LHP) can better solve the problems of liquid leakage and inability to perform long-distance heat transport in traditional heat pipes. It consists of an evaporator, a condenser, a liquid pipe, a gas pipe, and a compensator, and relies on the capillary force of the liquid-absorbing wick in the evaporator to make the working fluid circulate in the loop. Since there is only a liquid-absorbing wick in the evaporator of the loop heat pipe, and the liquid and gas pipelines are separated, the flow resistance of the working fluid is small, long-distance heat transfer can be achieved, and it is not easy to have liquid leakage problems. However, in the face of the problems of multi-source cooling or large-area heat source heat dissipation, the single-to-single and point-to-point heat dissipation mode of the loop heat pipe is no longer applicable. Thus, the multi-evaporator loop heat pipe for multi-point heat source matching single-point cold source heat transfer came into being.

[0004] The loop heat pipe with multiple evaporators and a single condenser has obvious advantages over traditional loop heat pipes. For example, it can match the heat dissipation of multiple heat sources or large-area heat sources, and has a higher heat transfer limit and can withstand a higher heat flux density. However, the multi-evaporator loop heat pipe still has defects. First, the heat load brought by multiple evaporators poses a challenge to the heat dissipation capacity of the condenser. The sum of the heat loads carried by each evaporator will cause a huge load on the condenser. Second, when an evaporator does not work, the heat load reaching the condensation end decreases, and the same heat dissipation mode will inevitably cause energy waste. How to regulate the heat dissipation mode at the condensation end to match the optimal heat load; and whether the non-working evaporator can be utilized to achieve the maximum efficiency of heat dissipation, thereby improving the working efficiency of the entire loop heat pipe, these are all technical problems that need to be solved. Summary of the Invention

[0005] The purpose of the present invention is to provide an asymmetric vein-type fin microchannel condenser and a multi-evaporator loop heat pipe with high heat exchange efficiency for the above problems.

[0006] To achieve its objectives, the technical solution adopted by the present invention is as follows:

[0007] An asymmetric vein-shaped fin microchannel condenser, the main body of the condenser is rectangular parallelepiped-shaped, and an upper partition and a lower partition are arranged inside the main body, dividing the inside of the main body into a steam chamber, a heat exchange chamber, and a condensate chamber from top to bottom in sequence. A steam inlet is arranged on the cavity of the steam chamber, and a condensate outlet is arranged on the cavity of the condensate chamber; a cooling fluid inlet and a cooling fluid outlet are arranged on the cavity of the heat exchange chamber. A number of hollow column-shaped fins arranged in a determinant are arranged in the heat exchange chamber. The top and bottom ends of the hollow column-shaped fins are respectively connected to the upper partition and the lower partition. Through holes are arranged on the upper partition and the lower partition where they are connected to the hollow column-shaped fins, so that the hollow column-shaped fins are respectively communicated with the steam chamber and the condensate chamber;

[0008] The hollow column-shaped fins in adjacent columns and adjacent rows are arranged staggeredly, and a number of side branch pipes are arranged from top to bottom between two adjacent fins in each row or each column of hollow column-shaped fins, so that the hollow column-shaped fins in the whole row or the whole column are sequentially communicated through the side branch pipes; on both sides of each hollow column-shaped fin, the side branch pipes are arranged at different heights from top to bottom, so that the side branch pipes on both sides are asymmetrically distributed, and the two ends of each side branch pipe are inclined at different heights; the inside of the hollow column-shaped fins and the side branch pipes serves as a steam microchannel for steam to flow through, and a hydrophobic material layer for suppressing condensate backflow is arranged on the inner surface of the side branch pipe;

[0009] A number of ventilation windows are arranged on two opposite side walls of the heat exchange chamber. An electric fan is also arranged on one of the side walls, which is used to blow cool air into the heat exchange chamber for heat dissipation, and baffles are arranged around the side wall where the electric fan is arranged to enclose the electric fan in the middle.

[0010] Preferably, the material of the hydrophobic material layer on the inner surface of the side branch pipe is fluorosilicon material or high molecular melt polymer, and the high molecular melt polymer is selected from polyolefin, polycarbonate, polyamide, polyacrylonitrile, polyester, fluorine-free acrylate, and molten paraffin.

[0011] Preferably, the cross section of the hollow column-shaped fin is airfoil-shaped, circular, elliptical or fusiform, which can reduce the flow resistance of the cooling fluid, make the flow of the cooling fluid smoother and faster, and improve the condensation efficiency of the condenser.

[0012] Preferably, a fan bracket is arranged on the side wall of the heat exchange chamber where the electric fan is arranged for installing the electric fan. The electric fan is electrically connected to an external power supply, so that the electric fan and the heat exchange chamber are integrally arranged, which is convenient for installation.

[0013] The present invention also provides a multi-evaporator loop heat pipe, which includes a plurality of gas pipelines, a plurality of liquid pipelines, a plurality of evaporators, and the condenser described in any one of the above items;

[0014] The multiple evaporators are connected in parallel with the steam chamber of the condenser through the multiple gas pipelines, and the multiple evaporators are also connected in parallel with the condensate chamber of the condenser through the multiple liquid pipelines.

[0015] Preferably, the loop heat pipe further includes a liquid reservoir, and the liquid reservoir is respectively communicated with the multiple liquid pipelines through multiple liquid replenishing pipelines. The liquid replenishing pipelines transport the liquid in the liquid reservoir into the liquid pipelines and then into the evaporators for liquid compensation, ensuring that there is sufficient heat exchange liquid in the evaporators to prevent dry burning.

[0016] Preferably, the number of the evaporators is 4, which is convenient for the arrangement of the evaporators and the condenser, makes the best use of the condenser, and enables one condenser to dissipate heat for multiple heat dissipation elements.

[0017] In the above technical solution, the evaporator includes an evaporator housing and a wick. The wick is arranged in the middle inside the evaporator housing, separating both ends of the inner cavity of the evaporator into an evaporator gas chamber and an evaporator liquid chamber;

[0018] The main body of the wick is cuboid-shaped, the bottom surface of the main body is the heated surface, the left side surface is the gas outlet end, and the right side surface is the liquid absorption end; a liquid storage tank is formed by the inward depression of the right side surface of the wick; a plurality of steam channels parallel to the heated surface are arranged on the outer surfaces of the front and rear side surfaces of the wick. One end of the steam channel reaches the gas outlet end and is communicated with the evaporator gas chamber, and the other end is at a distance from the liquid absorption end; the heated surface of the wick extends towards the evaporator gas chamber to form an extended surface for covering the surface where the evaporator gas chamber contacts the heating element.

[0019] A top gas channel and a plurality of intermediate gas channels are formed inside the wick. The top gas channel and the intermediate gas channels extend from the gas outlet end towards the liquid absorption end and are at a distance from the liquid absorption end; the intermediate gas channels penetrate up and down between the top surface and the bottom surface of the wick and are arranged parallel to the front and rear side surfaces of the wick; the top gas channel penetrates between the front and rear side surfaces of the wick and is communicated with the intermediate gas channels.

[0020] The intermediate gas channels divide the part of the wick near the gas outlet end into a plurality of wick chips parallel to the front and rear side surfaces of the wick. A plurality of liquid channels parallel to the heated surface are arranged on the wick chips from top to bottom. One end of the liquid channel extends to the liquid storage tank and is communicated with the evaporator liquid chamber, and the other end is at a distance from the gas outlet end.

[0021] Preferably, the top of the wick chip is arc-shaped, which further increases the evaporation area of the wick, enables the heat exchange cycle to proceed faster, and further improves the heat exchange efficiency.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The condenser of the present invention adopts hollow columnar fins with microchannels arranged in an array. The steam directly undergoes phase change condensation into liquid on the wall surface of the microchannels. The columnar fins can reduce the flow resistance of the cooling fluid. Moreover, a number of side branch pipes are provided between two adjacent hollow columnar fins, which greatly increases the heat transfer area within the limited heat exchange chamber space of the condenser, also speeds up the flow of steam and condensate in the microchannels, and improves the heat transfer efficiency. And the side branch pipes on both sides of the hollow columnar fins are arranged in an asymmetric vein shape. Compared with the symmetric arrangement of the side branch pipes, the asymmetric arrangement reduces the flow resistance of the cooling fluid in the heat exchange chamber on the one hand, promotes the flow of steam and condensate in the microchannels and increases the flow rate on the other hand, speeds up the heat transfer process, and improves the heat transfer efficiency of the condenser, laying a foundation for one condenser to drive multiple evaporators to work. A hydrophobic material layer is provided in the side branch pipes to prevent the condensate from flowing back due to the capillary action of the side branch pipes and hindering the circulation of the heat transfer medium.

[0024] 2. The condenser of the present invention is provided with a structure integrating natural cooling, air cooling and liquid cooling. One condenser can provide three heat dissipation modes, namely natural convection, air cooling and liquid cooling. Different heat dissipation modes can be selected according to the high or low heat load of the evaporator and the number of working evaporators. When the heat load of the evaporator is not high or there is an evaporator not working, the ventilation window on the side wall of the condenser can be opened for natural convection heat dissipation. When the heat load of the evaporator is relatively high, the ventilation window can be opened to turn on the electric fan to accelerate heat dissipation, or the ventilation window can be closed and the cooling fluid can be used to exchange heat in the heat exchange chamber for heat dissipation. The integrated design of multiple heat dissipation modes of the condenser can meet the different working modes of the loop heat pipes of multiple evaporators, and flexibly select the heat dissipation mode according to the number of working evaporators. When there is an evaporator not working, the heat dissipation load of the condenser does not need to be so large, avoiding energy waste caused by only one heat dissipation mode.

[0025] 3. By greatly improving the heat dissipation efficiency of the condenser, a loop heat pipe with one condenser matching multiple evaporators is realized. Only one condenser can meet the demand of multiple evaporators for simultaneous heat dissipation, ensuring the overall miniaturization of the loop heat pipe under high condensation efficiency, and being applicable to more application scenarios, meeting the requirements of electronic devices and equipment for the miniaturization of loop heat pipes.

[0026] 4. Multiple evaporators and a single condenser of the loop heat pipe of the present invention are connected in parallel, solving the problems of multi-source cooling and long-distance heat transport. In the case where an evaporator does not work, since the steam chambers of multiple evaporators and the condenser are connected in parallel, part of the steam may flow from the condenser steam chamber into the non-operating evaporator. The heated surface of the wick is extended to cover the surface where the evaporator gas chamber contacts the heating element, preventing the steam flowing in from heating the heating element and causing element damage. The extended surface of the heated surface of the wick plays a role in preventing heat from being transferred to the heating element and protecting the heating element. Part of the steam flowing into the non-operating evaporator allows the evaporator to also play a heat dissipation role, reducing the working burden of the condenser and accelerating heat dissipation.

[0027] 5. In the loop heat pipe of the present invention, the wick in the evaporator has a novel structure with a clever design concept. The wick divides the inner cavity of the evaporator into an air outlet end and a liquid suction end. The liquid storage tank provided at the liquid suction end can store the heat transfer working medium, ensuring that there is always enough heat transfer working medium in the wick and avoiding the wick from being dried out. The liquid storage tank functions as a liquid reservoir in the loop heat pipe, enabling the loop heat pipe of the present invention to work normally without setting a separate liquid reservoir, further reducing the overall volume of the loop heat pipe and realizing the miniaturization of the loop heat pipe. Multiple liquid channels are provided on the wick to guide the heat transfer working medium in the liquid storage tank to quickly enter the inside of the wick through the liquid channels. A top gas channel and multiple intermediate gas channels are provided inside the wick, greatly increasing the evaporation surface of the wick. The steam can also quickly flow to the gas pipeline through the numerous gas channels provided inside, accelerating the evaporation heat transfer rate, greatly improving the heat transfer efficiency, and solving the problems of difficult liquid return and gas accumulation in the heat pipe that easily lead to system startup failure.

[0028] The loop heat pipe with multiple evaporators and a single condenser of the present invention realizes a loop heat pipe in which a single condenser drives multiple evaporators to work through a novel condenser and evaporator structure with a clever design concept and reasonable structure. While ensuring the heat dissipation efficiency, it meets the miniaturization requirements, can be flexibly installed according to the number and position of the heating elements, and can select different heat dissipation modes according to the needs of different heat dissipation loads, avoiding waste of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a perspective view of the asymmetric vein-shaped fin microchannel condenser structure of the present invention;

[0030] Figure 2 is Figure 1 the front view of the condenser;

[0031] Figure 3 is Figure 1 the three-dimensional structure schematic diagram of the condenser;

[0032] Figure 4 is Figure 1 a schematic three-dimensional structure diagram of a hollow columnar fin in a heat exchange cavity of a condenser;

[0033] Figure 5 is Figure 4 a schematic connection diagram of the hollow columnar fins in

[0034] Figure 6 is Figure 4 a top view of the hollow columnar fins in

[0035] Figure 7 a schematic three-dimensional structure diagram of a multi-evaporator loop heat pipe according to the present invention;

[0036] Figure 8 is

[0037] Figure 9 a schematic three-dimensional structure diagram of an evaporator of the multi-evaporator loop heat pipe according to the present invention;

[0038] Figure 10 is Figure 9 a schematic three-dimensional structure diagram of a wick in the evaporator of

[0039] Figure 11 is Figure 10 a sectional view taken along line A-A in

[0040] Figure 12 is Figure 10 a schematic three-dimensional structure diagram of a wick chip of the wick in

[0041] Figure 13 is Figure 10 a right view of the wick from the liquid absorption end in

[0042] Wherein, the components or structures denoted by the reference numerals are: condenser 1, upper partition 11, lower partition 12, steam chamber 13, steam inlet 13a, heat exchange chamber 14, cooling fluid inlet 14a, cooling fluid outlet 14b, hollow columnar fin 141, side branch pipe 142, ventilation window 143, electric fan 144, baffle 145, condensate chamber 15, condensate outlet 15a, evaporator 2, wick 21, heated surface 211, extended surface 211a, gas outlet end 212, liquid absorption end 213, liquid storage tank 213a, steam channel 214, top gas channel 215, intermediate gas channel 216, wick chip 217, liquid channel 217a, evaporator gas chamber 22, evaporator liquid chamber 23, gas pipeline 3, liquid pipeline 4, liquid storage device 5, liquid replenishment pipeline 6. Detailed implementation manners

[0043] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the following embodiments are used to illustrate the present invention, but not to limit the scope of the present invention.

[0044] Embodiment 1: An asymmetric vein-shaped fin microchannel condenser

[0045] As Figure 1-6 shown, an asymmetric vein-shaped fin microchannel condenser, the main body of the condenser 1 is rectangular parallelepiped-shaped, and an upper partition 11 and a lower partition 12 are arranged inside the main body, dividing the inside of the main body into a steam chamber 13, a heat exchange chamber 14, and a condensate chamber 15 from top to bottom in sequence. A steam inlet 13a is arranged on the cavity of the steam chamber 13, and a condensate outlet 15a is arranged on the cavity of the condensate chamber 15; a cooling fluid inlet 14a and a cooling fluid outlet 14b are arranged on the cavity of the heat exchange chamber 14. A number of hollow columnar fins 141 arranged in a determinant are arranged in the heat exchange chamber 14. The top and bottom ends of the hollow columnar fins 141 are respectively connected to the upper partition 11 and the lower partition 12. Through holes are arranged on the upper partition 11 and the lower partition 12 at the places connected to the hollow columnar fins 141, so that the hollow columnar fins 141 are respectively communicated with the steam chamber 13 and the condensate chamber 15;

[0046] The adjacent columns and adjacent rows of the hollow columnar fins 141 are arranged staggeredly, and a number of side branch pipes 142 are arranged from top to bottom between two adjacent fins of each row or each column of the hollow columnar fins 141, so that the hollow columnar fins 141 in the whole row or the whole column are sequentially communicated through the side branch pipes 142, and the hollow columnar fins 141 in different rows or different columns are not communicated; on both sides of each hollow columnar fin 141, the side branch pipes 142 are arranged at different heights from top to bottom, so that the side branch pipes 142 on both sides are distributed asymmetrically in a vein-like shape, and the two ends of each side branch pipe 142 are arranged obliquely at different heights; the inside of the hollow columnar fins 141 and the side branch pipes 142 serves as a steam microchannel for steam to flow through, and a hydrophobic material layer for inhibiting condensate backflow is arranged on the inner surface of the side branch pipes 142;

[0047] A number of ventilation windows 143 are arranged on two opposite side walls of the heat exchange chamber 14. An electric fan 144 is also arranged on one of the side walls for blowing cool air into the heat exchange chamber 14 for heat dissipation, and baffles 145 are arranged around the side wall where the electric fan 144 is arranged to enclose the electric fan 144 in the middle. The ventilation windows 143 can be opened or closed as needed, and conventional opening and closing methods such as buckling can be adopted. When the heat dissipation mode is selected as natural convection or air cooling mode, the ventilation windows 143 are opened, and when the liquid cooling mode is selected, the ventilation windows 143 are closed.

[0048] In some embodiments, the material of the hydrophobic material layer on the inner surface of the side branch pipe 142 is a fluorosilicon material or a high molecular melt polymer, and the high molecular melt polymer is selected from polyolefin, polycarbonate, polyamide, polyacrylonitrile, polyester, non-fluorinated acrylate, and molten paraffin. The hydrophobic material layer can be disposed on the inner surface of the side branch pipe 142 by means of coating or other conventional methods.

[0049] In some embodiments, the cross-section of the hollow columnar fin 141 is airfoil-shaped, circular, elliptical or fusiform.

[0050] In some embodiments, a fan bracket is provided on the side wall of the heat exchange chamber 14 where the electric fan 144 is installed for installing the electric fan 144, and the electric fan 144 is electrically connected to an external power source.

[0051] Example 2 A multi-evaporator loop heat pipe

[0052] As Figure 7 shown, a multi-evaporator loop heat pipe includes a plurality of gas pipelines 3, a plurality of liquid pipelines 4, a plurality of evaporators 2 and the condenser 1 of Example 1;

[0053] A plurality of evaporators 2 are connected in parallel with the steam chamber 13 of the condenser 1 through a plurality of gas pipelines 3, and a plurality of evaporators 2 are also connected in parallel with the condensate chamber 15 of the condenser 1 through a plurality of liquid pipelines 4.

[0054] In some embodiments, as Figure 8 shown, the multi-evaporator loop heat pipe of the present invention further includes a liquid reservoir 5, and the liquid reservoir 5 is respectively communicated with a plurality of liquid pipelines 4 through a plurality of liquid replenishing pipelines 6, and the liquid replenishing pipelines 6 convey the liquid in the liquid reservoir 5 into the liquid pipelines 4 and then enter the evaporator 2 for liquid compensation.

[0055] In some embodiments, the number of evaporators 2 is 4.

[0056] In some embodiments, as Figure 9-13 shown, the evaporator 2 includes an evaporator housing and a wick 21, and the wick 21 is disposed in the middle inside the evaporator housing, separating both ends of the inner cavity of the evaporator 2 into an evaporator gas chamber 22 and an evaporator liquid chamber 23;

[0057] The main body of the wick 21 is rectangular. The bottom surface of the main body is the heat-receiving surface 211, the left side surface is the gas outlet end 212, and the right side surface is the liquid absorption end 213; an inward depression is formed on the right side surface of the wick 21 to form a liquid storage tank 213a; a number of steam channels 214 parallel to the heat-receiving surface 211 are arranged on the outer surfaces of the front and rear side surfaces of the wick 21. One end of the steam channel 214 reaches the gas outlet end 212 and is communicated with the evaporator gas chamber 22, and the other end is spaced from the liquid absorption end 213, so that the steam channel 214 is separated from the evaporator liquid chamber 23 and not communicated; the heat-receiving surface 211 of the wick 21 extends towards the evaporator gas chamber 22 to form an extended surface 211a for covering the surface of the evaporator gas chamber 22 in contact with the heating element;

[0058] A top gas channel 215 and a number of intermediate gas channels 216 are provided inside the wick 21. The top gas channel 215 and the intermediate gas channels 216 extend from the gas outlet end 212 towards the liquid absorption end 213 and are spaced from the liquid absorption end 213, so that the top gas channel 215 and the intermediate gas channels 216 are separated from the evaporator liquid chamber 23 and not communicated, avoiding the entry of the heat transfer working fluid liquid into the gas channels, resulting in a reduction in the liquid entering the inside of the wick 21 and a decrease in the evaporation rate and heat transfer efficiency; the intermediate gas channels 216 penetrate up and down between the top surface and the bottom surface of the wick 21 and are arranged parallel to the front and rear side surfaces of the wick 21; the top gas channel 215 penetrates between the front and rear side surfaces of the wick 21 and is communicated with the intermediate gas channels 216;

[0059] The intermediate gas channels 216 divide the part of the wick 21 close to the gas outlet end 212 into a number of wick chips 217 parallel to the front and rear side surfaces of the wick 21. A number of liquid channels 217a parallel to the heat-receiving surface 211 are arranged on the wick chips 217 from top to bottom. One end of the liquid channel 217a extends to the liquid storage tank 213a and is communicated with the evaporator liquid chamber 23, and the other end is spaced from the gas outlet end 212, so that the liquid channel 217a is separated from the evaporator gas chamber 22 and not communicated, avoiding the entry of the heat transfer working fluid liquid into the evaporator gas chamber 22, resulting in a reduction in the liquid entering the inside of the wick 21 and a decrease in the evaporation rate and heat transfer efficiency.

[0060] In some embodiments, the top of the wick chip 217 is in the shape of an arc curved surface.

[0061] The working process of the loop heat pipe of the present invention is as follows:

[0062] The evaporator 2 starts the heating operation. The liquid in the wick 21 is heated and evaporated into gas, which enters the steam chamber 13 of the condenser 1 through the gas pipeline 3 and exchanges heat through the heat exchange chamber 14. In the condenser 1, the steam condenses into liquid and enters the condensate chamber 15. Due to capillary action, it flows into the liquid storage tank 213a of the evaporator 2 through the liquid pipeline 4. The heat exchange working fluid liquid fills the wick 21, is heated into steam by the heat of the heating element, and enters the gas pipeline 3 to form a cycle.

[0063] A liquid reservoir 5 can also be connected. The liquid reservoir 5 is separated from the evaporator 2 and is connected to the liquid pipeline 4 and the evaporator 2 through a replenishing pipeline 6, which is used to store the excess heat exchange working fluid and supplement the liquid to the evaporator 2. The circulation of the working fluid is driven by the capillary pressure generated by the wick 21 of the evaporator without an external power source.

[0064] The loop heat pipe with multiple evaporators and a single condenser of the present invention realizes a loop heat pipe in which a single condenser drives multiple evaporators to work through a novel condenser and evaporator structure with ingenious design and reasonable structure. While ensuring the heat dissipation efficiency, it meets the miniaturization requirements, can be flexibly installed according to the number and position of the heating elements, and can select different heat dissipation modes according to the needs of different heat dissipation loads, avoiding waste of energy.

Claims

1. A multi-evaporator loop heat pipe, characterized in that: It includes a plurality of gas pipelines (3), a plurality of liquid pipelines (4), a plurality of evaporators (2), a condenser (1) and a liquid storage tank (5); The plurality of evaporators (2) are connected in parallel with the steam chamber (13) of the condenser (1) through the plurality of gas pipelines (3), and the plurality of evaporators (2) are also connected in parallel with the condensate chamber (15) of the condenser (1) through the plurality of liquid pipelines (4); The main body of the condenser (1) is rectangular parallelepiped-shaped, and an upper partition plate (11) and a lower partition plate (12) are arranged inside the main body, and the inside of the main body is sequentially divided into a steam chamber (13), a heat exchange chamber (14) and a condensate chamber (15) from top to bottom. A steam inlet (13a) is arranged on the cavity of the steam chamber (13), and a condensate outlet (15a) is arranged on the cavity of the condensate chamber (15); A cooling fluid inlet (14a) and a cooling fluid outlet (14b) are arranged on the cavity of the heat exchange chamber (14). A number of hollow columnar fins (141) arranged in a determinant pattern are arranged inside the heat exchange chamber (14). The top and bottom ends of the hollow columnar fins (141) are respectively connected to the upper partition plate (11) and the lower partition plate (12). Through holes are arranged on the upper partition plate (11) and the lower partition plate (12) at the places where they are connected to the hollow columnar fins (141), so that the hollow columnar fins (141) are respectively communicated with the steam chamber (13) and the condensate chamber (15); The hollow columnar fins (141) in adjacent columns and adjacent rows are arranged staggeredly, and a number of side branch pipes (142) are arranged from top to bottom between two adjacent fins of the hollow columnar fins (141) in each row or each column, so that the hollow columnar fins (141) in the whole row or the whole column are sequentially communicated through the side branch pipes (142); For each hollow columnar fin (141), the side branch pipes (142) on both sides are arranged at different heights from top to bottom so that the side branch pipes (142) on both sides are asymmetrically distributed, and the two ends of each side branch pipe (142) are inclined at different heights; The inside of the hollow columnar fins (141) and the side branch pipes (142) serves as a steam microchannel for steam to flow through, and a hydrophobic material layer for inhibiting condensate backflow is arranged on the inner surface of the side branch pipes (142); A number of ventilation windows (143) are arranged on two opposite side walls of the heat exchange chamber (14), and an electric fan (144) is also arranged on one of the side walls for blowing cool air into the heat exchange chamber (14) for heat dissipation, and baffles (145) are arranged around the side wall where the electric fan (144) is arranged to enclose the electric fan (144) in the middle; The liquid storage tank (5) is respectively communicated with the plurality of liquid pipelines (4) through a plurality of liquid supplement pipelines (6), and the liquid supplement pipelines (6) convey the liquid in the liquid storage tank (5) into the liquid pipelines (4) and then enter the evaporator (2) for liquid compensation.

2. The multi-evaporator loop heat pipe according to claim 1, wherein: The material of the hydrophobic material layer on the inner surface of the side branch pipe (142) is fluorosilicon material or polymer melt polymer, and the polymer melt polymer is selected from polyolefin, polycarbonate, polyamide, polyacrylonitrile, polyester, fluorine-free acrylate or molten paraffin.

3. The multi-evaporator loop heat pipe according to claim 1, characterized in that: The cross-section of the hollow columnar fin (141) is airfoil-shaped, circular, oval or fusiform.

4. The multi-evaporator loop heat pipe according to claim 1, wherein: On the side wall of the heat exchange chamber (14) where the electric fan (144) is arranged, there is a fan bracket for installing the electric fan (144), and the electric fan (144) is electrically connected to an external power supply.

5. The multi-evaporator loop heat pipe according to claim 1, characterized in that: The number of the evaporators (2) is 4.

6. The multi-evaporator loop heat pipe according to claim 1, wherein: The evaporator (2) includes an evaporator housing and a wick (21). The wick (21) is arranged in the middle inside the evaporator housing, separating both ends of the inner cavity of the evaporator (2) into an evaporator gas chamber (22) and an evaporator liquid chamber (23); The main body of the wick (21) is cuboid-shaped. The bottom surface of the main body is the heat receiving surface (211), the left side surface is the gas outlet end (212), and the right side surface is the liquid suction end (213); an inward depression is formed on the right side surface of the wick (21) to form a liquid storage tank (213a); a number of steam channels (214) parallel to the heat receiving surface (211) are arranged on the outer surfaces of the front and rear side surfaces of the wick (21). One end of the steam channel (214) reaches the gas outlet end (212) and communicates with the evaporator gas chamber (22), and the other end is spaced from the liquid suction end (213); the heat receiving surface (211) of the wick (21) extends towards the evaporator gas chamber (22) to form an extended surface (211a) for covering the surface of the evaporator gas chamber (22) in contact with the heating element; A top gas channel (215) and a number of intermediate gas channels (216) are opened inside the wick (21). The top gas channel (215) and the intermediate gas channels (216) extend from the gas outlet end (212) towards the liquid suction end (213) and are spaced from the liquid suction end (213); the intermediate gas channels (216) penetrate vertically between the top surface and the bottom surface of the wick (21) and are arranged parallel to the front and rear side surfaces of the wick (21); the top gas channel (215) penetrates between the front and rear side surfaces of the wick (21) and communicates with the intermediate gas channels (216); The intermediate gas channels (216) divide the part of the wick (21) near the gas outlet end (212) into a number of wick chips (217) parallel to the front and rear side surfaces of the wick (21). A number of liquid channels (217a) parallel to the heat receiving surface (211) are arranged on the wick chips (217) from top to bottom. One end of the liquid channel (217a) extends to the liquid storage tank (213a) and communicates with the evaporator liquid chamber (23), and the other end is spaced from the gas outlet end (212).

7. The multi-evaporator loop heat pipe according to claim 6, characterized in that: The top of the wick chip (217) is arc-curved.

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