CN114526625A - Heat pipe and preparation method thereof - Google Patents

Abstract

The invention discloses a heat pipe and a preparation method thereof, comprising a first combination part and a second combination part, wherein the first combination part comprises a first substrate, the lower surface of the first substrate is provided with a first spraying layer, the lower surface of the first substrate is subjected to metal spraying to form the first spraying layer, the first substrate and the first spraying layer are pressed to form the first combined part, the bottom surface of the first spraying layer is sequentially provided with a first groove, a second groove and a third groove from front to back, the left end of the first groove, the left end of the second groove and the left end of the third groove are communicated, the right end of the first groove, the right end of the second groove and the right end of the third groove are communicated, the second combination part comprises a second substrate, the upper surface of the second substrate is provided with a second spraying coating, and the upper surface of the second substrate is subjected to metal spraying to form a second spraying layer, and the second substrate and the second spraying layer are pressed to form the second combined part. The invention has the advantages of rapid heat transfer and conduction, firmness, durability, long service life and the like.

Description

Heat pipe and preparation method thereof

Technical Field

The invention belongs to the technical field of heat conducting devices, and particularly relates to a heat pipe and a preparation method thereof.

Background

The existing heat pipe is mainly composed of a sealed metal pipe body, a capillary structure in the metal pipe body and a heat transfer fluid filled in the metal pipe body, and the heat transfer fluid and the metal pipe body are kept in proper vacuum degree to reduce the temperature difference of the starting of the heat pipe.

Disclosure of Invention

The invention provides a heat pipe with long service life and a preparation method thereof, aiming at overcoming the defects in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme:

a heat pipe, comprising:

the first combination part comprises a first substrate, a first spraying layer is arranged on the lower surface of the first substrate, a first spraying layer is formed on the lower surface of the first substrate through metal spraying, the first substrate and the first spraying layer are pressed to form the first combination part, a first groove, a second groove and a third groove are sequentially arranged on the bottom surface of the first spraying layer from front to back, the left end of the first groove, the left end of the second groove and the left end of the third groove are communicated, the right end of the first groove, the right end of the second groove and the right end of the third groove are communicated, the second combination part comprises a second substrate, a second spraying layer is arranged on the upper surface of the second substrate, a second spraying layer is formed on the upper surface of the second substrate through metal spraying, the second substrate and the second spraying layer are pressed to form the second combination part, a fourth groove is sequentially formed on the top surface of the second spraying layer from front to back, The left end of the fourth groove, the left end of the fifth groove and the left end of the sixth groove are communicated, the right end of the fourth groove, the right end of the fifth groove and the right end of the sixth groove are communicated, the first groove, the second groove and the third groove are sequentially buckled on the fourth groove, the fifth groove and the sixth groove, the first combination part is buckled on the second combination part, the edge of the first combination part, which is contacted with the second combination part, is connected, the first groove and the fourth groove are encircled to form a first cavity, the second groove and the fifth groove are encircled to form a second cavity, the third groove and the sixth groove are encircled to form a third cavity, the left end of the first cavity, the left end of the second cavity and the left end of the third cavity are communicated, the right end of the first cavity, the right end of the second cavity and the right end of the third cavity are communicated, and a first liquid absorption core and a second liquid absorption core are respectively arranged in the first chamber and the third chamber, and fluid is filled in the first liquid absorption core and the second liquid absorption core.

Preferably, the first substrate and the second substrate are both made of a rigid heat conducting material.

Preferably, the first sprayed layer and the second sprayed layer are both composed of a plurality of layers of metal particles or powder, and the metal particles or powder are both made of heat conducting materials.

Preferably, the diameter of the metal particles is 2 to 100 μm.

The invention also discloses a preparation method of the heat pipe, which comprises the following steps:

(1) preparing a first substrate and a second substrate from rigid heat conduction materials, then respectively carrying out shielding treatment on the upper surface, the left side surface, the front side surface, the right side surface and the rear side surface of the first substrate, and carrying out shielding treatment on the lower surface, the left side surface, the front side surface, the right side surface and the rear side surface of the second substrate to expose areas of the first substrate and the second substrate needing metal spraying;

(2) carrying out surface roughening treatment on the lower surface of the first substrate and the upper surface of the second substrate in the step (1);

(3) performing metal spraying on the lower surface of the first substrate subjected to the surface roughening treatment in the step (2) and the upper surface of the second substrate to form a first spraying layer and a second spraying layer respectively;

(4) performing laminating treatment on the first substrate and the first spraying layer which are subjected to metal spraying in the step (3), and performing laminating treatment on the second substrate and the second spraying layer which are subjected to metal spraying in the step (3);

(5) grooves are respectively formed in the bottom surface of the first spraying layer and the top surface of the second spraying layer, then a first groove, a second groove and a third groove are formed in the bottom surface of the first spraying layer, and a fourth groove, a fifth groove and a sixth groove are formed in the top surface of the second spraying layer;

(6) aligning the first spraying layer on the first substrate subjected to grooving to a second spraying layer on a second substrate in the step (5), enabling the spraying layer of the first substrate to be buckled on the second spraying layer on the second substrate, enabling the first groove and the fourth groove to surround a first cavity, enabling the second groove and the fifth groove to surround a second cavity, enabling the third groove and the sixth groove to surround a third cavity, enabling the left end of the first cavity, the left end of the second cavity and the left end of the third cavity to be communicated, enabling the right end of the first cavity, the right end of the second cavity and the right end of the third cavity to be communicated, then respectively arranging a first liquid absorption core and a second liquid absorption core in the first cavity and the third cavity, then filling fluid into the first liquid absorption core and the second liquid absorption core, and vacuumizing in the second cavity;

(7) and (4) pressing the edges of the first substrate and the second substrate which are buckled together in the step (6) to manufacture the heat pipe.

Preferably, the thickness of the heat pipe manufactured after the pressing in the step (7) ranges from 0.1mm to 0.5 mm.

By adopting the technical scheme, the invention has the following beneficial effects:

(1) the first substrate and the second substrate are made of rigid heat conduction materials, then metal spraying is carried out on the first substrate and the second substrate made of the rigid heat conduction materials to obtain the first spraying layer and the second spraying layer, and finally the heat pipe is manufactured;

(2) the invention adopts metal spraying on the first substrate and the second substrate and presses the edges to finally manufacture the heat pipe, the thickness range of the manufactured heat pipe is 0.1mm-0.5mm, the thickness of the heat pipe in the prior art is mostly 2 mm-200 mm, and the heat pipe is not suitable for being applied to lighter and thinner electronic equipment in the future, the thickness range of the manufactured heat pipe is only 0.1mm-0.5mm, the thickness is small, the heat pipe is suitable for lighter and thinner electronic equipment, and the application scene is wide;

in conclusion, the invention has the advantages of rapid heat transfer and conduction, firmness, durability, long service life, thin thickness and the like.

Drawings

FIG. 1 is a schematic view of the structure of the first and second substrates of the present invention when the edges are not laminated;

FIG. 2 is a schematic view of the structure of FIG. 1 when the edges of the first and second substrates are pressed together;

FIG. 3 is a cross-sectional view taken in the direction A-A of FIG. 2;

FIG. 4 is a bottom view of the first sprayed layer of FIG. 1;

fig. 5 is a top view of the second sprayed layer of fig. 1.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-5, in a first embodiment of the present invention, a heat pipe of the present invention comprises;

the first combination part comprises a first substrate 1, a first spraying layer 2 is arranged on the lower surface of the first substrate 1, a first spraying layer 2 is formed on the lower surface of the first substrate 1 through metal spraying, the first substrate 1 and the first spraying layer 2 are pressed to form the first combination part, a first groove 3, a second groove 4 and a third groove 5 are sequentially arranged on the bottom surface of the first spraying layer 2 from front to back, the left end of the first groove 3, the left end of the second groove 4 and the left end of the third groove 5 are communicated, the right end of the first groove 3, the right end of the second groove 4 and the right end of the third groove 5 are communicated, the second combination part comprises a second substrate 6, a second spraying layer 7 is arranged on the upper surface of the second substrate 6, a second spraying layer 7 is formed on the upper surface of the second substrate 6 through metal spraying, the second substrate 6 and the second spraying layer 7 are pressed to form the second combination part, a fourth groove 8, a fifth groove 9 and a sixth groove 10 are sequentially formed in the top surface of the second spray coating layer 7 from front to back, the left end of the fourth groove 8, the left end of the fifth groove 9 and the left end of the sixth groove 10 are communicated, the right end of the fourth groove 8, the right end of the fifth groove 9 and the right end of the sixth groove 10 are communicated, the first groove 3, the second groove 4 and the third groove 5 are sequentially buckled on the fourth groove 8, the fifth groove 9 and the sixth groove 10, the first combination part is buckled on the second combination part, the edge of the first combination part, which is contacted with the second combination part, is connected, the first groove 3 and the fourth groove 8 are encircled to form a first cavity 11, the second groove 4 and the fifth groove 9 are encircled to form a second cavity 12, and the third groove 5 and the sixth groove 10 are encircled to form a third cavity 13, the left end of the first cavity 11, the left end of the second cavity 12 and the left end of the third cavity 13 are communicated, the right end of the first cavity 11, the right end of the second cavity 12 and the right end of the third cavity 13 are communicated, a first liquid absorbing core and a second liquid absorbing core are respectively arranged in the first cavity 11 and the third cavity 13, fluid is filled in the first liquid absorbing core and the second liquid absorbing core, the second cavity 12 is vacuumized to keep a certain degree of vacuum, the first cavity 11, the second cavity 12 and the third cavity 13 are divided by a partition plate 14 (namely, a part jointed between the first spraying layer 2 and the second spraying layer 7), and the left end and the right end of the first cavity 3, the second cavity 4, the third cavity 5, the fourth cavity 8, the fifth cavity 9 and the sixth cavity 10 are respectively communicated with each other by laser engraving, Etched or formed in other ways, the first groove 3, the second groove 4, the third groove 5, the fourth groove 8, the fifth groove 9 and the sixth groove 10 formed in any way are all covered in the protection scope of the present invention, wherein the connection of the edge of the first combination part contacting with the second combination part can be through press connection, welding or other ways, the connection of the first combination part and the second combination part in any way is covered in the protection scope of the present invention, the left end of the first chamber 11, the left end of the second chamber 12 and the left end of the third chamber 13 of the present invention are interconnected to form an annular flow channel, the right end of the first chamber 11, the right end of the second chamber 12 and the right end of the third chamber 13 of the present invention are interconnected to form an annular flow channel, the first liquid suction core and the second liquid suction core are also capillary structures, the first liquid suction core and the second liquid suction core can be separate constituent units, the first liquid suction core and the second liquid suction core are directly formed into a part of the first groove 3 and the second groove 4 or the fifth groove 9 and the sixth groove 10, namely the first liquid suction core and the second liquid suction core in the first groove 3 and the second groove 4 or the fifth groove 9 and the sixth groove 10 are capillary porous structures instead of through grooves, and the first liquid suction core and the second liquid suction core can be provided with structures such as a plurality of micropore micro-cores and the like.

The first substrate 1 and the second substrate 6 are both made of rigid heat conductive material, such as stainless steel or other metal alloy material.

The first sprayed layer 2 and the second sprayed layer 7 are both composed of a plurality of layers of metal particles or powder, the metal particles or powder are both made of heat conducting materials, and the metal particles or powder are copper particles or powder.

The diameter of the metal particles is 2-100 μm.

The invention also discloses a preparation method of the heat pipe, which comprises the following steps:

(1) the method comprises the steps of preparing a first substrate 1 and a second substrate 6 from rigid heat conduction materials, then respectively carrying out shielding treatment on the upper surface, the left side surface, the front side surface, the right side surface and the back side surface of the first substrate 1, carrying out shielding treatment on the lower surface, the left side surface, the front side surface, the right side surface and the back side surface of the second substrate 6, exposing the areas of the first substrate 1 and the second substrate 6 which need metal spraying, namely, the areas which do not need metal spraying, and exposing the areas which need metal spraying, wherein the shielding treatment can be realized by fixing the first substrate 1 and the second substrate 6 on a shielding jig, covering the areas of the first substrate 1 and the second substrate 6 which do not need metal spraying by the shielding jig, exposing the areas which need metal spraying, wrapping the first substrate 1 and the second substrate 6 by using thin layer materials, and removing the thin material corresponding to the areas which need metal spraying treatment by using equipment such as a laser engraving machine, thereby exposing the area needing metal spraying, and the method for shielding treatment is not particularly limited;

(2) performing surface roughening treatment on the lower surface of the first substrate 1 and the upper surface of the second substrate 6 in the step (1);

(3) performing metal spraying on the lower surface of the first substrate 1 subjected to the surface roughening treatment in the step (2) and the upper surface of the second substrate 6 to form a first spraying layer 2 and a second spraying layer 7 respectively, wherein the metal spraying comprises thermal spraying and cold spraying, wherein the thermal spraying is a technology that a powdery or filamentous metal or nonmetal material is heated to a molten or semi-molten state by using a certain heat source (such as an electric arc, plasma spraying or combustion flame, and the like), and then is sprayed to the surface of the treated substrate at a certain speed by means of high-speed gas to deposit and form a surface coating with various functions; cold spraying means that metal particles are not melted in the whole spraying process, compressed air is utilized to accelerate the metal particles, the metal particles are flattened on the surface of a base body and are firmly attached, in the embodiment, the material of the coating layer is made of heat conduction materials, the first spraying layer 2 and the second spraying layer 7 are formed by metal spraying, and in addition, the material of the coating layer can also comprise different mixed materials, so that the coating layer has one or more performances of wear resistance, corrosion resistance, oxidation resistance, high strength, high density, high melting point, high hardness, good gloss, good ductility and the like while obtaining heat conduction performance, and can meet different requirements;

(4) performing laminating treatment on the first substrate 1 and the first spraying layer 2 which are subjected to metal spraying in the step (3), and performing laminating treatment on the second substrate 6 and the second spraying layer 7 which are subjected to metal spraying in the step (3);

(5) grooves are respectively formed on the bottom surface of the first spraying layer 2 and the top surface of the second spraying layer 7, then a first groove 3, a second groove 4 and a third groove 5 are formed on the bottom surface of the first spraying layer 2, a fourth groove 8, a fifth groove 9 and a sixth groove 10 are formed on the top surface of the second spraying layer 7, the first groove 3, the second groove 4, the third groove 5, the fourth groove 8, the fifth groove 9 and the sixth groove 10 of the invention are not limited in specific shapes, and can be made into various patterns according to requirements and form backflow after being matched with each other for use, a first liquid absorbing core is arranged in a first chamber 11 of the invention, a second liquid absorbing core is arranged in a third chamber 13, a proper vacuum degree can be kept in the second chamber 12, gas can circulate in the second chamber 12, a certain shape can be made in the first spraying layer 2 and the second spraying layer 7 to form a certain channel, the requirement is met, one end of the liquid absorption device is an evaporation end and the other end of the liquid absorption device is a condensation end in use, when the liquid absorption device is normally used, fluid in a first liquid absorption core and a second liquid absorption core at the evaporation end absorbs heat, changes the fluid into gas, enters a second cavity 12 and reaches the condensation end along the second cavity 12, and the gas changes the liquid again, enters the first liquid absorption core and the second liquid absorption core and flows back to the evaporation end;

(6) aligning the first spray coating layer 2 on the first substrate 1 subjected to grooving in the step (5) with the second spray coating layer 7 on the second substrate 6, so that the spray coating layer of the first substrate 1 is buckled on the second spray coating layer 7 on the second substrate 6, and the first groove 3 and the fourth groove 8 enclose a first chamber 11, the second groove 4 and the fifth groove 9 enclose a second chamber 12, the third groove 5 and the sixth groove 10 enclose a third chamber 13, and the left end of the first chamber 11, the left end of the second chamber 12 and the left end of the third chamber 13 are communicated, the right end of the first chamber 11, the right end of the second chamber 12 and the right end of the third chamber 13 are communicated, a first wick and a second wick are then provided in the first chamber 11 and the third chamber 13 respectively, then filling fluid into the first wick and the second wick and vacuumizing the second chamber 12;

(7) the edges of the first substrate 1 and the second substrate 6 which are buckled together in the step (6) are pressed to form the heat pipe, the thickness range of the heat pipe which is manufactured after pressing is 0.1mm-0.5mm, the heat pipe which is manufactured by adopting all-copper materials is generally adopted in the prior art, and the heat pipe which is manufactured by adopting copper is soft in texture, not firm and durable enough, short in service life and higher in cost.

In another embodiment of the present invention, a plurality of cavities may be formed by disposing a plurality of grooves to dispose a plurality of wick structures to meet the use requirement, for example, when four wicks are required to be disposed as compared with the first embodiment, the heat pipe of the present invention includes;

a first combination part and a second combination part, wherein the first combination part comprises a first substrate 1, a first spraying coating layer 2 is arranged on the lower surface of the first substrate 1, the lower surface of the first substrate 1 is coated with metal to form a first coating layer 2, the first substrate 1 and the first coating layer 2 are pressed to form the first combined part, the bottom surface of the first spraying layer 2 is sequentially provided with a seventh groove, an eighth groove, a ninth groove, a tenth groove, an eleventh groove and a twelfth groove from front to back, the left end of the seventh groove, the left end of the eighth groove and the left end of the ninth groove are communicated, the right end of the seventh groove, the right end of the eighth groove and the right end of the ninth groove are communicated, the left end of the tenth groove, the left end of the eleventh groove and the left end of the twelfth groove are communicated, and the right end of the tenth groove, the right end of the eleventh groove and the right end of the twelfth groove are communicated; the second combination part comprises a second substrate 6, a second spraying layer 7 is arranged on the upper surface of the second substrate 6, the second spraying layer 7 is formed by metal spraying on the upper surface of the second substrate 6, the second substrate 6 and the second spraying layer 7 are pressed to form the second combination part, a thirteenth groove, a fourteenth groove, a fifteenth groove, a sixteenth groove, a seventeenth groove and an eighteenth groove are sequentially arranged on the top surface of the second spraying layer 7 from front to back, the left end of the thirteenth groove, the left end of the fourteenth groove and the left end of the fifteenth groove are communicated, the right end of the thirteenth groove, the right end of the fourteenth groove and the right end of the fifteenth groove are communicated, the left end of the sixteenth groove, the left end of the seventeenth groove and the left end of the eighteenth groove are communicated, the right end of the sixteenth groove, the right end of the seventeenth groove and the right end of the eighteenth groove are communicated, the first combination part is buckled on the second combination part, the first combination part is connected with the edge of the second combination part, which is contacted with the second combination part, the seventh groove and the thirteenth groove form a fourth chamber, the eighth groove and the fourteenth groove form a fifth chamber, the ninth groove and the fifteenth groove form a sixth chamber, the left end and the right end of the fourth chamber, the fifth chamber and the sixth chamber are respectively provided with two barrels, the tenth groove and the sixteenth groove form a seventh chamber, the eleventh groove and the seventeenth groove form an eighth chamber, the twelfth groove and the eighteenth groove form a ninth chamber, the left end and the right end of the seventh chamber, the eighth chamber and the ninth chamber are respectively communicated, and the third liquid absorption core, the fourth liquid absorption core, the fifth liquid absorption core and the sixth liquid absorption core are respectively arranged in the fourth chamber, the sixth chamber, the seventh chamber and the ninth chamber, the third liquid absorption core, the fourth liquid absorption core, the fifth liquid absorption core and the sixth liquid absorption core are filled with fluid, the fifth chamber and the eighth chamber are vacuumized and keep a certain degree of vacuum, the seventh groove, the eighth groove, the ninth groove, the tenth groove, the eleventh groove, the twelfth groove, the thirteenth groove, the fourteenth groove, the fifteenth groove, the sixteenth groove, the seventeenth groove and the eighteenth groove of the invention are formed by laser engraving, etching or other methods, the seventh groove, the eighth groove, the ninth groove, the fourth groove 8, the fifth groove 9 and the sixth groove 10 which are formed in any mode are covered in the protection range of the invention, wherein the connection of the edges of the first combination part, which are contacted with the second combination part, can be connected by pressing connection, welding or other modes, and the connection of the first combination part and the second combination part in any mode is covered in the protection range of the invention, the left end of a fourth chamber, the left end of a fifth chamber, the left end of a sixth chamber, the left end of a seventh chamber, the left end of an eighth chamber and the left end of a ninth chamber are communicated to form an annular flow channel, the right end of the fourth chamber, the right end of the fifth chamber, the right end of the sixth chamber, the right end of the seventh chamber, the right end of the eighth chamber and the right end of the ninth chamber are communicated to form an annular flow channel, a third liquid suction core, a fourth liquid suction core, a fifth liquid suction core and a sixth liquid suction core are also capillary structures, a plurality of microporous micro-cores and other structures can be arranged in the third liquid suction core, the fourth liquid suction core, the fifth liquid suction core and the sixth liquid suction core, and a plurality of groups of capillary structures are formed inside the liquid suction device, so that the heat dissipation and heat conduction efficiencies are enhanced The twelfth groove, the thirteenth groove, the fourteenth groove, the fifteenth groove, the sixteenth groove, the seventeenth groove and the eighteenth groove are not limited to specific shapes, and can be made into various patterns according to requirements and form backflow after being matched with each other for use And when the fifth chamber or the eighth chamber reaches the condensation end, the gas is changed into liquid again, enters the third liquid absorbing core, the fourth liquid absorbing core, the fifth liquid absorbing core and the sixth liquid absorbing core and then flows back to the evaporation end.

The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (6)

1. A heat pipe, comprising:

the first combination part comprises a first substrate, a first spraying layer is arranged on the lower surface of the first substrate, a first spraying layer is formed on the lower surface of the first substrate through metal spraying, the first substrate and the first spraying layer are pressed to form the first combination part, a first groove, a second groove and a third groove are sequentially arranged on the bottom surface of the first spraying layer from front to back, the left end of the first groove, the left end of the second groove and the left end of the third groove are communicated, the right end of the first groove, the right end of the second groove and the right end of the third groove are communicated, the second combination part comprises a second substrate, a second spraying layer is arranged on the upper surface of the second substrate, a second spraying layer is formed on the upper surface of the second substrate through metal spraying, the second substrate and the second spraying layer are pressed to form the second combination part, a fourth groove is sequentially formed on the top surface of the second spraying layer from front to back, The left end of the fourth groove, the left end of the fifth groove and the left end of the sixth groove are communicated, the right end of the fourth groove, the right end of the fifth groove and the right end of the sixth groove are communicated, the first groove, the second groove and the third groove are sequentially buckled on the fourth groove, the fifth groove and the sixth groove, the first combination part is buckled on the second combination part, the edge of the first combination part, which is contacted with the second combination part, is connected, the first groove and the fourth groove are encircled to form a first cavity, the second groove and the fifth groove are encircled to form a second cavity, the third groove and the sixth groove are encircled to form a third cavity, the left end of the first cavity, the left end of the second cavity and the left end of the third cavity are communicated, the right end of the first cavity, the right end of the second cavity and the right end of the third cavity are communicated, and a first liquid absorption core and a second liquid absorption core are respectively arranged in the first chamber and the third chamber, and fluid is filled in the first liquid absorption core and the second liquid absorption core.

2. A heat pipe as set forth in claim 1 wherein: the first substrate and the second substrate are both made of a rigid heat conducting material.

3. A heat pipe as set forth in claim 2 wherein: the first spraying layer and the second spraying layer are both composed of a plurality of layers of metal particles or powder, and the metal particles or powder are both made of heat conducting materials.

4. A heat pipe as set forth in claim 3 wherein: the diameter of the metal particles is 2-100 μm.

5. A method of making a heat pipe according to claim 4, comprising the steps of:

(1) manufacturing a first substrate and a second substrate from rigid heat conduction materials, then respectively carrying out shielding treatment on the upper surface, the left side surface, the front side surface, the right side surface and the rear side surface of the first substrate, and carrying out shielding treatment on the lower surface, the left side surface, the front side surface, the right side surface and the rear side surface of the second substrate to expose areas of the first substrate and the second substrate, which need metal spraying;

(2) carrying out surface roughening treatment on the lower surface of the first substrate and the upper surface of the second substrate in the step (1);

(3) performing metal spraying on the lower surface of the first substrate subjected to the surface roughening treatment in the step (2) and the upper surface of the second substrate to form a first spraying layer and a second spraying layer respectively;

(4) performing laminating treatment on the first substrate and the first spraying layer which are subjected to metal spraying in the step (3), and performing laminating treatment on the second substrate and the second spraying layer which are subjected to metal spraying in the step (3);

(5) respectively forming grooves on the bottom surface of the first spraying layer and the top surface of the second spraying layer, then forming a first groove, a second groove and a third groove on the bottom surface of the first spraying layer, and forming a fourth groove, a fifth groove and a sixth groove on the top surface of the second spraying layer;

(6) aligning the first spraying layer on the first substrate subjected to grooving to a second spraying layer on a second substrate in the step (5), enabling the spraying layer of the first substrate to be buckled on the second spraying layer on the second substrate, enabling the first groove and the fourth groove to surround a first cavity, enabling the second groove and the fifth groove to surround a second cavity, enabling the third groove and the sixth groove to surround a third cavity, enabling the left end of the first cavity, the left end of the second cavity and the left end of the third cavity to be communicated, enabling the right end of the first cavity, the right end of the second cavity and the right end of the third cavity to be communicated, then respectively arranging a first liquid absorption core and a second liquid absorption core in the first cavity and the third cavity, then filling fluid into the first liquid absorption core and the second liquid absorption core, and vacuumizing in the second cavity;

(7) and (4) pressing the edges of the first substrate and the second substrate which are buckled together in the step (6) to manufacture the heat pipe.

6. A method of making a heat pipe according to claim 5, wherein: the thickness range of the heat pipe manufactured after the pressing in the step (7) is 0.1mm-0.5 mm.

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