A tubular element and heat pipe with a boat-shaped porous capillary structure

Abstract

The present invention provides a tubular element with a boat-shaped porous capillary structure, comprising a copper metal tube and a boat-shaped porous capillary structure. The copper metal tube has an inner surface, the inner surface has a plurality of groove structures, and the groove structure has a groove bottom surface and a groove side wall. The boat-shaped porous capillary structure is continuously formed in each groove structure, and the boat-shaped porous capillary structure has an upper surface, a lower surface, and a side surface. The upper surface has a middle recessed area and an edge protruding area. The lower surface is attached to the groove bottom surface. The side surface gradually shrinks from the upper surface to the lower surface, and there is a side wall gap between the side surface and the groove side wall. The present invention increases the conveying speed of the liquid working fluid in the heat pipe element, thereby improving the thermal conductivity and heat removal power of the heat pipe element.

Description

Technical Field

[0001] The present invention relates to a heat pipe structural element, in particular to a heat pipe tubular structural element with a gap formed between a capillary structure and a side wall of a substrate groove. Background Art

[0002] The water absorption capacity of the capillary structure is an important parameter in the design of general heat pipe components. The capillary structure with high permeability has a higher transmission capacity for the liquid working fluid in the heat pipe component, which is conducive to the condensation and reflux of the liquid working fluid, improves the two-phase circulation of the heat pipe component, and thus increases the heat transfer performance of the component. When the thickness of the heat pipe component is thinner after being flattened, the accommodation space between the upper and lower tube walls becomes smaller. In order to maintain sufficient flow space for the gas phase working fluid, the thickness of the capillary structure must be limited.

[0003] The thinner the capillary structure is, the less liquid working fluid it carries, and the speed at which the liquid working fluid flows back from the far condensation zone to the evaporation zone is also slow, affecting the two-phase circulation of the heat pipe element, and further affecting the heat conduction function and heat removal power.

[0004] The capillary structure inside the heat pipe generally includes sintered copper powder capillary structure, copper mesh capillary structure, groove capillary structure and composite capillary structure. In the sintered copper powder capillary structure, the copper powder heat pipe C1 is formed by sintering copper powder on the inner wall of the metal tube C10 to form a sintered porous copper powder layer C11, and the center of the tube is reserved as an airway, such as Figure 1A The copper mesh heat pipe C2 is a copper mesh C21 laid in the inner space of the metal pipe C20, and the remaining space is the airway, as shown in FIG. Figure 2A As shown in the figure. Since most electronic products are designed to be flat, heat pipes are usually further pressed into a flat shape to increase the contact area and facilitate installation, such as Figure 1B and Figure 2B shown.

[0005] However, the sintered copper powder capillary structure must have a considerable thickness of copper powder layer and is prone to cracks. When the thickness of the tubular heat pipe element after flattening is less than 1.0 mm, currently only the copper mesh capillary structure process can adapt to mass production. And when it is less than 1.0 mm, the copper mesh capillary structure also faces the problem of capillary limit, which greatly reduces the conveying capacity of the liquid working fluid. During production, the copper mesh needs to be manually threaded and accurately placed in the copper tube, which is very unfavorable for automated mass production.

[0006] The industry is in urgent need of a new capillary structure that can meet both the requirements of efficiency and automated process, to solve the problems of insufficient liquid working fluid delivery speed due to the reduction in thickness and capillary limit of copper mesh in current heat pipe components, as well as the problem of efficient and automated production of heat pipe components. Summary of the invention

[0007] In view of this, the object of the present invention is to provide a tubular element and a heat pipe with a boat-shaped porous capillary structure, which includes a groove structure and a boat-shaped porous capillary structure, and a tubular structural element with a gap formed between the porous capillary structure and the side wall of the groove in the tube. This tubular structural element with a composite novel capillary structure can be highly automated and mass-produced, and has excellent working fluid permeability and capillary transport capacity, overcoming the problem that the current sintered copper powder capillary and copper mesh capillary heat pipes are difficult to be highly automated and mass-produced.

[0008] To achieve the above object, the present invention discloses a tubular element with a boat-shaped porous capillary structure, which is characterized by comprising:

[0009] A copper metal tube having an inner surface with a plurality of groove structures, each groove structure having a groove bottom surface and a groove side wall; and

[0010] A boat-shaped porous capillary structure is formed in each groove structure, and the boat-shaped porous capillary structure has:

[0011] An upper surface having a middle recessed area and an edge raised area;

[0012] a lower surface attached to the bottom surface of the groove; and

[0013] A side surface gradually shrinks from the upper surface to the lower surface, and a side wall gap is provided between the side surface and the side wall of the groove.

[0014] Each groove structure is a strip-shaped groove structure and extends to both ends of the copper metal tube. The depth of the strip-shaped groove structure is between 0.1 mm and 1.0 mm, the length of the strip-shaped groove structure is at least 100 mm, and the width of the strip-shaped groove structure is between 0.5 mm and 5.0 mm.

[0015] The width of the upper surface is greater than the width of the lower surface, and the maximum width of the boat-shaped porous capillary structure is greater than 3 times the minimum width of the sidewall gap.

[0016] The minimum width of the sidewall gap is greater than 10um.

[0017] The boat-shaped porous capillary structure is a powder sintered porous capillary structure, which is formed by a slurry through printing, drying, cracking and sintering processes, and the slurry contains a plurality of metal copper particles, a plurality of cuprous oxide particles and a polymer colloid.

[0018] Also disclosed is a heat pipe having a boat-shaped porous capillary structure, characterized in that it comprises:

[0019] A copper metal sealed tube having an inner surface and forming a closed cavity, wherein the inner surface has a plurality of groove structures, each of the groove structures having a groove bottom surface and a groove side wall;

[0020] A boat-shaped porous capillary structure is formed in each groove structure, and the boat-shaped porous capillary structure has:

[0021] An upper surface having a middle recessed area and an edge raised area;

[0022] a lower surface attached to the bottom surface of the groove; and

[0023] A side surface gradually shrinks from the upper surface to the lower surface, and a side wall gap is formed between the side surface and the side wall of the groove; and

[0024] A working fluid flows in the closed cavity in gas phase or liquid phase.

[0025] Among them, there is further an evaporation zone and a condensation zone, wherein each groove structure is a long groove structure, one end of the long groove structure points to the evaporation zone, and the other end of the long groove structure points to the condensation zone, the depth of the long groove structure is between 0.1mm and 1.0mm, the length of the long groove structure is at least 80mm, and the width of the long groove structure is between 0.5mm and 5.0mm.

[0026] The width of the upper surface is greater than the width of the lower surface, and the maximum width of the boat-shaped porous capillary structure is greater than 3 times the minimum width of the sidewall gap.

[0027] The minimum width of the sidewall gap is greater than 10um.

[0028] The boat-shaped porous capillary structure is a powder sintered porous capillary structure, which is formed by a slurry through printing, drying, cracking and sintering processes, and the slurry contains a plurality of metal copper particles, a plurality of cuprous oxide particles and a polymer colloid.

[0029] In summary, the present invention forms a tiny sidewall gap between the boat-shaped porous metal capillary structure and the substrate groove, and the sidewall gap belongs to a micro-groove structure, has a good permeability to the working fluid, and also provides a capillary force, thereby forming a composite capillary structure in which the boat-shaped porous capillary structure and the sidewall gap are integrated. The present invention increases the permeability of the liquid working fluid in the heat pipe and accelerates the capillary transport speed of the liquid working fluid from the condensation zone to the evaporation zone, thereby improving the thermal conductivity and heat removal power of the heat pipe element. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1A and Figure 1B A schematic cross-sectional view of a sintered copper powder capillary heat pipe in the prior art is shown;

[0031] Figure 2A and Figure 2B A schematic cross-sectional view of a copper mesh capillary heat pipe in the prior art is shown;

[0032] Figure 3 A schematic cross-sectional view of a tubular element having a boat-shaped porous capillary structure in one embodiment of the present invention is shown;

[0033] Figure 4A Draw Figure 3 A partially enlarged schematic diagram of a tubular element having a boat-shaped porous capillary structure in an embodiment;

[0034] Figure 4B Draw Figure 3 Schematic diagram of a boat-shaped porous capillary structure in an embodiment;

[0035] Figure 5 Draw Figure 3 A schematic diagram of the composition of a boat-shaped porous capillary structure in the embodiment;

[0036] Figure 6 Draw Figure 3 A schematic diagram of a bird's-eye view of a tubular element having a boat-shaped porous capillary structure in an embodiment;

[0037] Figure 7 A schematic diagram showing a bird's-eye view of a heat pipe element having a boat-shaped porous capillary structure in another specific embodiment of the present invention;

[0038] Figure 8 A schematic diagram is shown showing the flow direction of the liquid working fluid in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the advantages, spirit and features of the present invention easier and clearer to understand, the following will be described and discussed in detail with reference to the accompanying drawings and specific embodiments. It should be noted that these specific embodiments are only representative embodiments of the present invention, and the specific methods, devices, conditions, materials, etc. exemplified therein are not intended to limit the present invention or the corresponding specific embodiments. In addition, the vertical direction, horizontal direction and each element in the figure are only used to express their relative positions, and are not drawn according to their actual proportions, which should be explained in advance.

[0040] See also Figure 3 , Figure 4A and Figure 4B . Figure 3 A schematic cross-sectional view of a tubular element having a boat-shaped porous capillary structure in one embodiment of the present invention is shown; Figure 4A Draw Figure 3 A partially enlarged schematic diagram of a tubular element having a boat-shaped porous capillary structure in an embodiment; Figure 4B Draw Figure 3 Schematic diagram of a boat-shaped porous capillary structure in an embodiment. One scope of the present invention is to provide a tubular element T having a boat-shaped porous capillary structure, comprising a copper metal tube 1 and a boat-shaped porous capillary structure 2. The copper metal tube 1 has an inner surface, and the inner surface has a plurality of groove structures 10, and the groove structure 10 has a groove bottom surface 102 and a groove side wall 104. The boat-shaped porous capillary structure 2 is continuously formed in each groove structure 10, and the boat-shaped porous capillary structure 2 has an upper surface 21, a lower surface 22, and a side surface 24. The upper surface 21 has a middle recessed area 215 and an edge protruding area 217. The lower surface 22 is attached to the groove bottom surface 102. The side surface 24 gradually shrinks from the upper surface 21 to the lower surface 22, and there is a side wall gap 106 between the side surface 24 and the groove side wall 104.

[0041] The groove structure 10 is a long groove structure extending to both ends of the copper metal tube 1. A plurality of groove structures 10 may be separated by a plurality of supporting walls 18. The supporting walls 18 isolate the direct exchange of the liquid working fluid in two adjacent groove structures 10, and the two adjacent groove structures 10 must bypass the supporting walls 18 to communicate. The groove sidewall 104 is the long sidewall of the groove structure 10.

[0042] The side surface 24 is the long side surface of the boat-shaped porous capillary structure 2. At least one side surface 24 tapers downward and inward and is separated from the groove side wall 104 by a side wall gap 106. In the embodiment where both sides are separated by the side wall gap 106, the side surface 24 and the raised edge protrusion area 217 make the cross section of the boat-shaped porous capillary structure 2 look like a boat viewed from the side. In practical applications, the greater the curvature of the curved surface formed by the middle recessed area 215 and the edge protrusion area 217 of the upper surface 21 of the boat-shaped porous capillary structure 2, the better the capillary force. The larger the side wall gap 106, the better the permeability to the working fluid and the greater the carrying capacity. If the tubular element T with the boat-shaped porous capillary structure is further processed into a heat pipe element and flattened into a thin heat pipe, it is beneficial to the circulation efficiency of the two-phase flow, thereby increasing the thermal conductivity of the Bo-shaped heat pipe.

[0043] The width of the upper surface 21 of the boat-shaped porous capillary structure 2 is greater than the width of the lower surface 22, and the maximum transverse width of the boat-shaped porous capillary structure 2 is greater than 3 times the minimum width of the sidewall gap 106. The minimum width of the sidewall gap is greater than 10um. The sidewall gap 106 is narrow at the top and wide at the bottom, which is beneficial to increase the working fluid storage volume between the working fluid 3 and the boat-shaped porous capillary structure 2.

[0044] See also Figure 4A and Figure 8 . Figure 8 A schematic diagram is shown showing the flow direction of the liquid working fluid in a specific embodiment of the present invention. Figure 8 The composite capillary structure of the present invention is composed of a boat-shaped porous capillary structure 2, a groove structure 10 and a sidewall gap 106. The channel of the sidewall gap 106 and the boat-shaped porous capillary structure 2 complement each other and serve together as a conveying channel for the liquid phase working fluid 3 in the heat pipe.

[0045] The liquid working fluid 3 is poured into the heat pipe element. The liquid working fluid 3 is adsorbed in the inner and sidewall gaps 106 of the boat-shaped porous capillary structure 2. The water level of the liquid working fluid 3 in the sidewall gaps 106 may be higher than the average water level of the liquid working fluid 3 in the boat-shaped porous capillary structure 2.

[0046] Since the sidewall gap 106 is in the shape of a long micro-groove, it has a good liquid-phase working fluid permeability, and the boat-shaped porous capillary structure 2 has a good capillary pressure difference, the liquid-phase working fluid is quickly transported to the evaporation area.

[0047] See also Figure 5 and Figure 6 . Figure 5 Draw Figure 3 A schematic diagram of the composition of a boat-shaped porous capillary structure in the embodiment;

[0048] Figure 6 Draw Figure 3 A top view of a tubular element with a boat-shaped porous capillary structure in an embodiment. The depth D1 of the elongated groove structure 10 is between 0.1 mm and 1.0 mm, the length D2 of the elongated groove structure 10 is at least 100 mm, and the width D3 of the elongated groove structure 10 is between 0.5 mm and 5.0 mm.

[0049] The tubular element T with a boat-shaped porous capillary structure has two open ends 15, so that the tubular element has an open cavity 14 inside to communicate with the outside. The length D2 of the long groove structure 10 can be equal to the length of the tubular element T with a boat-shaped porous capillary structure, or the long groove structure 10 can be arranged in the tubular element T with a boat-shaped porous capillary structure as a dotted line. In practical applications, if a tubular element with a length of 100 mm is to be mass-produced, a tubular element with a length of 500 mm can be first produced, and then cut into 5 tubular elements T with a boat-shaped porous capillary structure. Alternatively, a tubular element with a boat-shaped porous capillary structure of any length can be produced, and then cut into short tubular elements of any length for processing and manufacturing heat pipe elements of any length.

[0050] The boat-shaped porous capillary structure 2 is a powder sintered capillary structure. The boat-shaped porous capillary structure 2 includes a plurality of chain-shaped copper components 26 and a plurality of spherical copper components 28. The chain-shaped copper components 26 are connected to each other. The spherical copper components 28 are dispersed between the chain-shaped copper components 26. A plurality of pores are formed between the chain-shaped copper components and the spherical copper components. In a specific embodiment, the average diameter of the spherical copper components 28 is greater than the average diameter of the chain-shaped copper components 26.

[0051] The boat-shaped porous capillary structure 2 is a powder sintered porous capillary structure, such as copper powder. The powder sintered porous capillary structure is made of a slurry through printing, drying, cracking and sintering processes.

[0052] The slurry includes a plurality of metallic copper (Cu) particles, a plurality of cuprous oxide (Cu2O) particles, an organic solvent and a polymer; the particles are fine powder particles, which have powder properties when agglomerated, or can be called metallic copper powder and cuprous oxide powder. The polymer exists in the form of a rheological colloid under normal temperature and pressure conditions and is mixed in the solvent. The slurry is laid in the groove structure of the flexible copper sheet, for example, by direct continuous scraping, or by stencil printing or screen printing. Due to the rheological properties of the slurry, the slurry will evenly spread over the groove structure 10, covering the bottom surface of the groove and touching the side wall of the groove. The slurry is heated to remove the organic solvent and crack the polymer, so that the metallic copper particles are sintered to each other and form a boat-shaped porous capillary structure with side wall gaps.

[0053] After drying, the slurry is freed from solvent to form a solidified product. The polymer colloid is attached between the metal copper particles and the cuprous oxide particles, and the polymer, the metal copper particles and the cuprous oxide particles are condensed inward to form a prototype of the sidewall gap 106 after sintering. The polymer in the solidified product is gasified and removed during the cracking process, leaving holes between the metal copper particles and the cuprous oxide particles. When sintered in a hydrogen-containing atmosphere, the cuprous oxide crystals are partially reduced and extended to form long chains. After sintering, the metal copper powder forms a spherical copper component 28, and the cuprous oxide particles are reduced, sintered and stretched to form a chain-like copper component 26. The reduced cuprous oxide particles are stretched along the spherical copper component 28 in the aforementioned holes, and after solidification, a chain-like copper component 26 and a spherical copper component 28 that are interlaced with each other are formed.

[0054] When the temperature exceeds a certain level, the cuprous oxide crystals will extend and elongate from the farthest ends, while the metallic copper crystals will not extend and elongate; cuprous oxide cannot sinter with each other at high temperatures, while metallic copper will sinter with each other. Therefore, in order to ensure that the cuprous oxide particles can actually be sintered and extended during the sintering process, it is necessary. In actual application, the sintering process temperature is controlled between 700 and 800°C and is carried out in a strictly controlled nitrogen-hydrogen mixed reducing atmosphere.

[0055] The average particle size D50 of the metal copper particles is about 10um to 53um. Or in another embodiment, the average particle size D50 of the metal copper particles is about 10um to 30um. The average particle size of the cuprous oxide particles is about 0.5um to 5um, and the cuprous oxide particles of rhombic octahedral crystals are preferred.

[0056] See also Figure 7 and Figure 8 . Figure 7 A schematic diagram of a heat pipe element with a boat-shaped porous capillary structure in another specific embodiment of the present invention is shown. Another scope of the present invention is to provide a heat pipe P with a boat-shaped porous capillary structure. The elements with the same names or numbers in this embodiment and the previous embodiment have substantially the same structure or effect, and will not be described in detail here. The differences from the previous embodiment will be described below.

[0057] The heat pipe P with a boat-shaped porous capillary structure includes a copper metal sealed tube 4, a boat-shaped porous capillary structure 2 and a working fluid 3. The copper metal sealed tube 4 has an inner surface and forms a closed cavity 44, and the inner surface has a plurality of groove structures, and the groove structure has a groove bottom surface and a groove side wall. The working fluid 3 flows in the closed cavity 44 in a gas phase or a liquid phase. The boat-shaped porous capillary structure 2 is formed in each of the groove structures, and the boat-shaped porous capillary structure 2 has an upper surface, a lower surface, and a side surface. The upper surface has a middle recessed area and an edge protruding area. The lower surface is attached to the bottom surface of the groove. The side surface gradually shrinks from the upper surface to the lower surface, and there is a side wall gap between the side surface and the groove side wall.

[0058] The copper metal sealed tube 4 has two sealed ends 45, so that a sealed cavity 44 is formed in the tube. The air pressure of the sealed cavity 44 is a negative pressure less than 1 atmosphere. The vacuum sealed cavity 44 containing the capillary structure and the working fluid 3 forms a heat pipe with heat exchange function.

[0059] The heat pipe P with the boat-shaped porous capillary structure further has an evaporation area P1 and a condensation area P2, wherein the groove structure is a long groove structure, one end of the long groove structure points to the evaporation area, and the other end of the long groove structure points to the condensation area.

[0060] The boat-shaped porous capillary structure 2 can be further divided into a first capillary structure and a second capillary structure. The first capillary structure is arranged in the evaporation zone P1, the second capillary structure is not arranged in the evaporation zone P1, and the second capillary structure is arranged outside the evaporation zone P1, especially in the far-end condensation zone P2 and the insulation section between the evaporation zone P1 and the condensation zone P2.

[0061] The first capillary structure and the second capillary structure are continuous structures, and the first capillary structure and the second capillary structure have different porosities. In a specific embodiment, the porosity of the first capillary structure is greater than that of the second capillary structure. The pore size of the first capillary structure is greater than that of the second capillary structure. The average particle size of the first capillary structure is greater than that of the second capillary structure. In particular, the average particle size of the spherical copper component of the first capillary structure is greater than that of the spherical copper component of the second capillary structure.

[0062] The first capillary structure has a large average particle size, which is conducive to forming a large area of ​​water film on the surface when the liquid working fluid boils and evaporates, thereby reducing thermal resistance and evaporating into a gaseous working fluid at a faster speed; relatively speaking, the second capillary structure has a small average particle size, which is conducive to enhancing the capillary force of conveying the liquid working fluid and accelerating the flow rate of the liquid working fluid. Therefore, the first capillary structure is arranged in the evaporation zone W1, which is more conducive to the conversion of the liquid phase into the gaseous working fluid, and the second capillary structure is arranged in other sections to help the liquid working fluid return from the condensing end to the evaporating end.

[0063] In practical applications, the heat pipe P having a boat-shaped porous capillary structure can be Figure 6 The tubular element T with a boat-shaped porous capillary structure is further processed and has the element features and manufacturing method of the previous embodiment. The processing steps include: first closing one of the open ends 15 to form a closed end 45; pouring the working fluid 3 into the open cavity 14 from the other open end 15; evacuating the other open end 15; and closing the other open end 15 to form another closed end 45.

[0064] Please refer to Figure 8 When the heat pipe P with the boat-shaped porous capillary structure is actually in operation, the liquid-phase working fluid 3 in the sidewall gap and the liquid-phase working fluid 3 in the boat-shaped porous capillary structure 2 move in the same direction (arrow direction). However, the fluid resistance in the sidewall gap is small, and the liquid-phase working fluid 3 flows faster; the fluid resistance in the boat-shaped porous capillary structure 2 is large, and the liquid-phase working fluid 3 flows slower. The liquid-phase working fluid 3 in the sidewall gap can also be supplemented into the boat-shaped porous capillary structure 2.

[0065] The composite capillary structure of the present invention can deliver pure water at a speed of more than 30 mm / sec in an anti-gravity vertical water absorption test, which is more than twice as fast as the pure water delivery speed of the copper mesh capillary structure. It has significant benefits for the capillary force of the heat pipe element.

[0066] In summary, the composite capillary structure provided by the present invention utilizes the sidewall gap between the porous metal capillary structure and the groove sidewall to form the composite capillary structure. Since the sidewall gap also forms a long strip micro-groove capillary effect, it has a good permeability for the liquid working fluid. At the same time, the presence of the sidewall gap also increases the carrying amount of the liquid working fluid in the entire composite capillary structure, and accelerates the delivery speed of the liquid working fluid from the far end condensation zone to the evaporation zone, thereby improving the thermal conductivity and heat removal power of the heat pipe element.

[0067] The above detailed description of the preferred embodiments is intended to more clearly describe the features and spirit of the present invention, rather than to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, the purpose is to cover various changes and arrangements with equivalents within the scope of the patent scope to be applied for by the present invention. Therefore, the scope of the patent scope applied for by the present invention should be interpreted in the broadest sense based on the above description, so as to cover all possible changes and arrangements with equivalents.

Claims

1. A tubular element having a boat-shaped porous capillary structure, characterized in that Contains: A copper metal tube having an inner surface with a plurality of groove structures, each groove structure having a groove bottom surface and a groove side wall; and A boat-shaped porous capillary structure is formed in each groove structure, and the boat-shaped porous capillary structure has: An upper surface having a middle recessed area and two edge protruding areas; a lower surface attached to the bottom surface of the groove; and A side surface gradually shrinks from the upper surface to the lower surface, and a side wall gap is formed between the side surface and the side wall of the groove; The width of the upper surface is greater than the width of the lower surface, and the maximum width of the boat-shaped porous capillary structure is greater than 3 times the minimum width of the sidewall gap; The minimum width of the sidewall gap is greater than 10um.

2. The tubular element having a boat-shaped porous capillary structure according to claim 1, characterized in that: Each groove structure is a strip groove structure and extends to both ends of the copper metal tube. The depth of the strip groove structure is between 0.1mm and 1.0mm, the length of the strip groove structure is at least 100mm, and the width of the strip groove structure is between 0.5mm and 5.0mm.

3. The tubular element having a boat-shaped porous capillary structure according to claim 1, characterized in that: The boat-shaped porous capillary structure is a powder sintered porous capillary structure, which is formed by a slurry through printing, drying, cracking and sintering processes, and the slurry contains a plurality of metal copper particles, a plurality of cuprous oxide particles and a polymer colloid.

4. A heat pipe having a boat-shaped porous capillary structure, characterized in that Contains: A copper metal sealed tube having an inner surface and forming a sealed cavity, wherein the inner surface has a plurality of groove structures, each of the groove structures having a groove bottom surface and a groove side wall; A boat-shaped porous capillary structure is formed in each groove structure, and the boat-shaped porous capillary structure has: An upper surface having a middle recessed area and two edge protruding areas; a lower surface attached to the bottom surface of the groove; and A side surface gradually shrinks from the upper surface to the lower surface, and a side wall gap is formed between the side surface and the side wall of the groove; and A working fluid flows in the closed cavity in a gas phase or a liquid phase; The width of the upper surface is greater than the width of the lower surface, and the maximum width of the boat-shaped porous capillary structure is greater than 3 times the minimum width of the sidewall gap; The minimum width of the sidewall gap is greater than 10um.

5. The heat pipe with a boat-shaped porous capillary structure according to claim 4, characterized in that: It further has an evaporation zone and a condensation zone, wherein each groove structure is a long strip groove structure, one end of the long strip groove structure points to the evaporation zone, and the other end of the long strip groove structure points to the condensation zone, the depth of the long strip groove structure is between 0.1mm and 1.0mm, the length of the long strip groove structure is at least 80mm, and the width of the long strip groove structure is between 0.5mm and 5.0mm.

6. The heat pipe with a boat-shaped porous capillary structure according to claim 4, characterized in that: The boat-shaped porous capillary structure is a powder sintered porous capillary structure, which is formed by a slurry through printing, drying, cracking and sintering processes, and the slurry contains a plurality of metal copper particles, a plurality of cuprous oxide particles and a polymer colloid.

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