Heat pipe type heat exchanger based on condensate drop bounce and heat exchange method

Abstract

The invention relates to a heat pipe type heat exchanger based on condensate drop bounce and a heat exchange method, the heat exchanger comprises a pipe shell and a capillary liquid absorption structure, and an evaporation area, a transportation area and a condensation area are formed in the pipe shell; the capillary liquid absorption structure comprises an evaporation capillary liquid absorption part, a transportation capillary liquid absorption part and a condensation capillary liquid absorption part; the evaporation capillary liquid absorption part covers the inner wall of the evaporation area; the transportation capillary liquid absorption part extends from the evaporation area to the condensation area, and the end, located in the evaporation area, of the transportation capillary liquid absorption part is connected with the evaporation capillary liquid absorption part; the condensation capillary liquid absorption parts of the columnar structures are distributed in the circumferential direction of the transportation capillary liquid absorption part in a divergent mode, one end of each condensation capillary liquid absorption part is connected with or tightly attached to the transportation capillary liquid absorption part, and the other end of each condensation capillary liquid absorption part extends to the position making contact with or close to the inner wall of the condensation area. The technical problems that heat resistance is increased and heat exchange efficiency is reduced due to a liquid film formed on the heat exchange tube are solved.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange and heat dissipation technology, and further to a heat pipe heat exchanger and a heat exchange method, and in particular to a heat pipe heat exchanger and a heat exchange method based on the bouncing of condensed liquid droplets. Background Art

[0002] A heat pipe radiator (heat pipe heat exchanger) is a heat dissipation device that uses passive cooling technology. It absorbs and releases heat by utilizing the phase change of the working fluid within the heat pipe. Its simple structure allows for efficient and stable operation in extreme temperature fluctuations and microgravity environments. Existing heat pipe radiators typically utilize a capillary wick material arranged on the inner wall of the heat exchange tube to circulate the working fluid. A sufficient number of heat pipes can be integrated to achieve heat exchange, depending on actual heat exchange needs.

[0003] In the existing technical solutions, since the capillary wick material is arranged on the inner wall of the heat exchange tube, this arrangement will cause condensation to form a liquid film on the wall of the heat exchange tube, thereby causing the overall thermal resistance of the heat exchange tube to increase and the heat exchange efficiency to decrease, which cannot meet the heat dissipation requirements of equipment with strict space and weight restrictions (such as space reactors, etc.).

[0004] Regarding the problem in related technologies that the liquid film formed on the heat exchange tube will lead to increased thermal resistance and reduced heat exchange efficiency, no effective solution has been given so far.

[0005] Therefore, the present invention proposes a heat pipe heat exchanger and a heat exchange method based on condensation droplet bouncing to overcome the defects of the prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a heat pipe heat exchanger and heat exchange method based on the bouncing of condensed droplets, which converts the liquid film formed by condensation into droplet form, thereby avoiding the increase in thermal resistance of the heat exchange tube due to the formation of a liquid film on the inner wall of the heat exchange tube, and effectively improving the heat exchange efficiency.

[0007] The purpose of the present invention can be achieved by adopting the following scheme:

[0008] The present invention provides a heat pipe heat exchanger based on condensed liquid droplet bouncing, the heat pipe heat exchanger based on condensed liquid droplet bouncing comprising:

[0009] A tube shell, wherein the tube shell has a hollow chamber, wherein the hollow chamber has a heat exchange medium, and wherein the hollow chamber is sequentially formed with an evaporation zone, a transport zone, and a condensation zone that are interconnected along a first direction;

[0010] A capillary liquid absorption structure made of a porous material, the capillary liquid absorption structure comprising an evaporation capillary liquid absorption portion, a transport capillary liquid absorption portion and a condensation capillary liquid absorption portion;

[0011] The evaporation capillary liquid absorption portion is in a layered structure adapted to the evaporation region, and the evaporation capillary liquid absorption portion is covered on the inner wall of the evaporation region;

[0012] The transport capillary liquid absorbing portion is a columnar structure, is located in the hollow chamber and extends from the evaporation zone to the condensation zone along the first direction, and one end of the transport capillary liquid absorbing portion is located in the evaporation zone and is connected to the evaporation capillary liquid absorbing portion;

[0013] The condensation capillary liquid absorption portion is a plurality of columnar structures, and the condensation capillary liquid absorption portions of the plurality of columnar structures are located in the condensation zone and are arranged in a divergent manner along the circumference of the transport capillary liquid absorption portion. One end of the condensation capillary liquid absorption portion of each columnar structure is connected to or tightly fitted with the transport capillary liquid absorption portion, and the other end of the condensation capillary liquid absorption portion of each columnar structure extends to a position in contact with or close to the inner wall of the condensation zone.

[0014] In a preferred embodiment of the present invention, the condensation capillary liquid absorption parts of the plurality of columnar structures are arranged in a plurality of groups, and the condensation capillary liquid absorption parts in the plurality of groups are arranged at intervals along the extension direction of the transport capillary liquid absorption part;

[0015] The plurality of condensation capillary liquid suction portions in at least two adjacent groups are staggered in the extending direction of the transport capillary liquid suction portion.

[0016] In a preferred embodiment of the present invention, the condensation capillary liquid suction sections in two adjacent groups are spaced at equal distances along the extending direction of the transport capillary liquid suction section.

[0017] In a preferred embodiment of the present invention, the surface of the capillary structure has a super lyophilic layer.

[0018] In a preferred embodiment of the present invention, the contact angle between the super lyophilic layer and the liquid heat transfer medium is less than 5°.

[0019] In a preferred embodiment of the present invention, the inner wall surface of the condensation zone has a super liquid-repellent layer.

[0020] In a preferred embodiment of the present invention, the contact angle between the super-lyophobic layer and the liquid heat transfer medium is greater than 150°.

[0021] In a preferred embodiment of the present invention, the inner wall surface of the condensation zone has microstructure units;

[0022] The microstructure unit includes a plurality of strip-shaped grooves, the plurality of grooves are distributed on the inner wall surface of the condensation zone at intervals along the circumference of the condensation zone, and each of the grooves extends along the axial direction of the condensation zone;

[0023] And / or, the microstructure unit includes a plurality of pits, and the plurality of pits are arranged in an array on the inner wall surface of the condensation zone.

[0024] In a preferred embodiment of the present invention, when the microstructure unit includes a plurality of the grooves, the width of the grooves is 10 μm to 500 μm, and / or the depth of the grooves is 10 μm to 500 μm.

[0025] In a preferred embodiment of the present invention, when the microstructure unit includes a plurality of the grooves, the inner walls of the grooves are in a multi-step structure.

[0026] In a preferred embodiment of the present invention, when the microstructure unit includes a plurality of pits, the diameter of the pits or the maximum spacing between the inner walls of the pits is 5 μm to 50 μm, and / or the depth of the pits is 2 μm to 20 μm, and / or the spacing between two adjacent pits is 0.5 μm to 5 μm.

[0027] In a preferred embodiment of the present invention, a support tube is provided inside the liquid transport capillary portion along its extension direction, and two ends of the support tube are respectively connected to two opposite inner walls of the tube shell.

[0028] The present invention provides a heat exchange method based on condensate droplet bouncing, which is implemented using the above-mentioned heat pipe heat exchanger based on condensate droplet bouncing. The heat exchange method includes the following steps:

[0029] Step S1: arranging the evaporation zone in the heat source area requiring heat exchange;

[0030] Step S2: the heat exchange medium in the evaporation zone flows from the evaporation zone through the transport zone to the condensation zone in a gaseous form;

[0031] Step S3: The gaseous heat exchange medium in the condensation zone is condensed into liquid droplets on the inner wall of the condensation zone;

[0032] Step S4: at least part of the liquid droplets located on the inner wall of the condensation zone bounces to the condensation capillary liquid absorption portion;

[0033] Step S5: transporting the liquid heat exchange medium on the condensation capillary liquid absorption portion to the evaporation capillary liquid absorption portion via the transport capillary liquid absorption portion;

[0034] Step S6: The liquid heat exchange medium on the evaporation capillary liquid absorption portion is heated and evaporated in the heat source area to form a gaseous heat exchange medium, which then enters the evaporation area;

[0035] Step S7: looping the above steps S1 to S6.

[0036] In a preferred embodiment of the present invention, in step S4, the droplets that bounce from the inner wall of the condensation zone to the condensation capillary liquid suction part are micron-sized droplets or submicron-sized droplets.

[0037] In a preferred embodiment of the present invention, in step S4, a plurality of adjacent liquid droplets located on the inner wall of the condensation zone are brought into contact and merged and then bounce toward the condensation capillary liquid absorption portion.

[0038] As described above, the characteristics and advantages of the heat pipe heat exchanger and heat exchange method based on condensate droplet bouncing of the present invention are:

[0039] In the hollow chamber of the tube shell, an evaporation zone, a transport zone and a condensation zone are sequentially formed along a first direction, and the capillary liquid absorption structure made of porous material includes an evaporation capillary liquid absorption portion, a transport capillary liquid absorption portion and a condensation capillary liquid absorption portion. The evaporation capillary liquid absorption portion is a layered structure covered on the inner wall of the evaporation zone, and the transport capillary liquid absorption portion is a columnar structure and extends from the evaporation zone to the condensation zone. The transport capillary liquid absorption portion is located at one end of the evaporation zone and is connected to the evaporation capillary liquid absorption portion, and a plurality of columnar condensation capillary liquid absorption portions are divergently arranged along the circumference of the transport capillary liquid absorption portion on the portion of the transport capillary liquid absorption portion located in the condensation zone. The transport capillary liquid absorption portion plays a role in transporting the heat exchange medium in a liquid state from the condensation capillary liquid absorption portion to the evaporation capillary liquid absorption portion. Under the action of the heat source area, the heat exchange medium in the evaporation zone flows through the transport capillary liquid absorption portion in the hollow chamber in a gaseous form. The heat transfer medium is transported from the heat transfer zone to the condensation zone and condenses on the inner wall of the condensation zone to form a number of small droplets (i.e., a heat transfer medium in liquid form). When two or more adjacent droplets come into contact and merge, they bounce toward the condensation capillary liquid absorption portion and are absorbed by the condensation capillary liquid absorption portion. Driven by the capillary force, the heat transfer medium in liquid form returns to the evaporation zone along the condensation capillary liquid absorption portion, the transport capillary liquid absorption portion, and the evaporation capillary liquid absorption portion in turn. Under the action of the heat source area, the heat transfer medium in liquid form evaporates into a heat transfer medium in gaseous form and repeats the above process, thereby forming a cycle of "evaporation → condensation → bounce → return" of the heat transfer medium. During the whole process, the heat transfer medium is in a dynamic circulation state and no longer exists in the form of a liquid film covering the wall of the heat exchange tube, thereby avoiding the problem of increased thermal resistance of the heat exchange tube due to the formation of the liquid film, and effectively improving the heat exchange efficiency of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0041] in:

[0042] Figure 1 It is a front cross-sectional view of a heat pipe heat exchanger based on condensate droplet bouncing according to the present invention;

[0043] Figure 2 for Figure 1 Cross-sectional view at the middle AA position;

[0044] Figure 3 for Figure 1 Cross-section at the mid-BB position;

[0045] Figure 4 for Figure 1 Cross-section at the mid-CC position;

[0046] Figure 5 Schematic diagram of the bouncing state of liquid droplets in the condensation zone of the heat pipe heat exchanger based on the bouncing of condensed liquid droplets according to the present invention;

[0047] Figure 6 Schematic diagram of the arrangement of microstructure units in a heat pipe heat exchanger based on condensate droplet bouncing according to the present invention;

[0048] Figure 7 This is a working principle diagram of the heat pipe heat exchanger based on condensation droplet bouncing of the present invention.

[0049] The accompanying drawings in the present invention are:

[0050] 1. Shell and tube; 101. Hollow chamber;

[0051] 1011. Evaporation area; 1012. Transportation area;

[0052] 1013. Condensation zone; 1014. Microstructure unit;

[0053] 2. Capillary liquid absorption structure; 201. Evaporation capillary liquid absorption part;

[0054] 202, transport capillary liquid suction part; 2021, support tube;

[0055] 203. Condensation capillary liquid absorption part. DETAILED DESCRIPTION

[0056] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0057] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementations.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0059] Implementation Method 1

[0060] like Figures 1 to 7 As shown, the present invention provides a heat pipe heat exchanger based on the bouncing of condensed liquid droplets, which includes a tube shell 1 and a capillary liquid absorption structure 2 made of a porous material. The tube shell 1 has a long cylindrical hollow chamber 101, and the hollow chamber 101 has a heat exchange medium. The hollow chamber 101 is sequentially formed with an evaporation area 1011, a transport area 1012 and a condensation area 1013 that are interconnected along a first direction; the capillary liquid absorption structure 2 includes an evaporation capillary liquid absorption portion 201, a transport capillary liquid absorption portion 202 and a condensation capillary liquid absorption portion 203; the evaporation capillary liquid absorption portion 201 is a layered structure adapted to the evaporation area 1011, and the evaporation capillary liquid absorption portion 201 is covered on the inner wall of the evaporation area 1011, and the evaporation capillary liquid absorption portion 201 is tightly fitted with the inner wall of the evaporation area 1011; The transport capillary liquid absorption portion 202 is a columnar structure, and the transport capillary liquid absorption portion 202 is located at the central axis position in the hollow chamber 101, and the transport capillary liquid absorption portion 202 extends from the evaporation zone 1011 to the condensation zone 1013 along the first direction. One end of the transport capillary liquid absorption portion 202 located in the evaporation zone 1011 is connected to or tightly fitted with the evaporation capillary liquid absorption portion 201; the condensation capillary liquid absorption portion 203 is a plurality of columnar structures, and the condensation capillary liquid absorption portions 203 of the plurality of columnar structures are located in the condensation zone 1013 and are divergently arranged along the circumference of the transport capillary liquid absorption portion 202, one end of each columnar structure of the condensation capillary liquid absorption portion 203 is connected to the transport capillary liquid absorption portion 202, and the other end of each columnar structure of the condensation capillary liquid absorption portion 203 extends to a position in contact with or close to the inner wall of the condensation zone 1013.

[0061] In the present invention, the heat exchange medium can be a heat exchange medium (such as water) commonly used in existing heat exchange tubes that absorbs and releases heat and can convert between gaseous and liquid states, and heat exchange is achieved through phase change; and the porous material used as the capillary liquid absorption structure 2 in the present invention can be a densely arranged channel-shaped, sintered granular, wire mesh-shaped, foam-shaped or honeycomb-shaped structure. Specifically, the porous material can be but is not limited to copper, aluminum, titanium, nickel, iron, copper alloy, aluminum alloy, titanium alloy, nickel alloy, iron alloy or SiC and other materials.

[0062] In the present invention, the first direction is the length direction of the hollow chamber 101 , so that the evaporation zone 1011 , the transport zone 1012 and the condensation zone 1013 are distributed along the length direction of the hollow chamber 101 .

[0063] In the present invention, an evaporation zone 1011, a transport zone 1012, and a condensation zone 1013 are sequentially formed in the hollow chamber 101 of the tube shell 1 along the first direction. The capillary liquid absorption structure 2 made of a porous material includes an evaporation capillary liquid absorption portion 201, a transport capillary liquid absorption portion 202, and a condensation capillary liquid absorption portion 203. The evaporation capillary liquid absorption portion 201 is a layered structure covering the inner wall of the evaporation zone 1011, and the transport capillary liquid absorption portion 202 is a columnar structure and extends from the evaporation zone 1011 to the condensation zone 1013. 013, the transport capillary liquid absorption portion 202 is located at one end of the evaporation area 1011 and is connected to the evaporation capillary liquid absorption portion 201, and the portion of the transport capillary liquid absorption portion 202 located in the condensation area 1013 is provided with a plurality of columnar condensation capillary liquid absorption portions 203 in a divergent manner along the circumference of the transport capillary liquid absorption portion 202. The transport capillary liquid absorption portion 202 plays the role of transporting the heat exchange medium in a liquid state from the condensation capillary liquid absorption portion 203 to the evaporation capillary liquid absorption portion 201. Under the action of the heat source area, the position The heat exchange medium in the evaporation zone 1011 flows in the hollow chamber 101 through the transport zone to the condensation zone 1013 in the form of gas, and condenses on the inner wall surface of the condensation zone 1013 to form a number of small droplets (i.e., forming a liquid form of heat exchange medium). When two or more adjacent droplets contact and merge, they bounce toward the condensation capillary liquid absorption portion 203 and are absorbed by the condensation capillary liquid absorption portion 203. The liquid form of heat exchange medium is driven by capillary force and moves in sequence along the condensation capillary liquid absorption portion 203, the transport capillary liquid absorption portion 203, and the condensation capillary liquid absorption portion 203. The part 202 and the evaporation capillary liquid absorption part 201 return to the evaporation area 1011, and under the action of the heat source area, the liquid form of the heat exchange medium evaporates into the gaseous form of the heat exchange medium and repeats the above process, thereby forming a "evaporation → condensation → bounce → return" cycle of the heat exchange medium. During the whole process, the heat exchange medium is in a dynamic circulation state and no longer exists in the form of a liquid film covering the wall of the heat exchange tube, thereby avoiding the problem of increased thermal resistance of the heat exchange tube due to the formation of the liquid film, and effectively improving the heat exchange efficiency of the heat exchange tube.

[0064] In an optional embodiment of the present invention, the housing 1 has a centrally symmetrical cylindrical structure, such as a triangular prism, a square prism, a hexagonal prism, or a cylinder. The housing 1 may be made of, but not limited to, copper, aluminum, titanium, nickel, iron, a copper alloy, an aluminum alloy, a titanium alloy, a nickel alloy, an iron alloy, or SiC.

[0065] Furthermore, in conjunction with the structure of the tube shell 1, the transport capillary liquid suction portion 202 in the present invention also presents a centrally symmetrical columnar structure. For example, the transport capillary liquid suction portion 202 can be a triangular prism, a square prism, a hexagonal prism or a cylinder, etc., to ensure that the transport capillary liquid suction portion 202 can be set at the axial position of the hollow chamber 101. The transport capillary liquid suction portion 202 plays a certain supporting role, ensuring the structural stability of the capillary liquid suction structure 2 and the tube shell 1, and can also reduce the flow resistance of the transport capillary liquid suction portion 202 to the gaseous heat exchange medium, thereby realizing rapid circulation of the heat exchange medium in the tubular heat exchanger.

[0066] Further, such as Figures 1 to 5 As shown, a support tube 2021 is provided inside the transport capillary liquid suction portion 202 along its extension direction, and both ends of the support tube 2021 are respectively connected to two opposite inner walls of the tube shell 1, and the support stability is further improved by the support tube 2021.

[0067] In an optional embodiment of the present invention, Figure 1 、 Figure 4 and Figure 5 As shown, the multiple columnar condensation capillary liquid absorption portions 203 are divided into multiple groups, and the condensation capillary liquid absorption portions 203 in the multiple groups are arranged at intervals along the extension direction of the transport capillary liquid absorption portion 202, thereby ensuring that the droplets condensed on the inner wall of the condensation area 1013 can be evenly absorbed by the condensation capillary liquid absorption portion 203, thereby improving the transportation efficiency of the liquid heat exchange medium and achieving the purpose of improving the heat exchange efficiency.

[0068] Furthermore, multiple condensation capillary suction portions 203 in at least two adjacent groups are staggered in the extension direction of the transport capillary suction portion 202. By staggering the condensation capillary suction portions 203 in each group along the axial direction of the hollow chamber 101, it is ensured that there is an air gap in the condensation area 1013 and along the axial direction of the hollow chamber 101, so that the heat exchange medium in gaseous form will not be blocked and its flow rate will not be reduced during the flow in the condensation area 1013, thereby ensuring that the gaseous heat exchange medium can be quickly dispersed in the condensation area 1013, thereby achieving the effect of fully condensing the gaseous heat exchange medium.

[0069] Furthermore, the condensation capillary liquid absorption sections 203 in two adjacent groups are spaced at equal distances along the extension direction of the transport capillary liquid absorption section 202. By evenly arranging the condensation capillary liquid absorption sections 203 of each group along the extension direction of the transport capillary liquid absorption section 202, the uniformity of the distribution of the condensation capillary liquid absorption sections 203 is improved, thereby improving the transportation efficiency of the liquid heat exchange medium and achieving the purpose of improving the heat exchange efficiency.

[0070] The condensation capillary liquid absorption portion 203 may be a centrosymmetrical columnar structure. For example, the condensation capillary liquid absorption portion 203 may be a triangular prism, a square prism, a hexagonal prism, or a cylinder.

[0071] In an optional embodiment of the present invention, the surface of the capillary sorption structure 2 has a super lyophilic layer, and the contact angle between the super lyophilic layer and the liquid heat exchange medium is less than 5°, thereby providing a greater capillary force during operation to improve the capillary sorption structure 2's ability to receive and transport the liquid heat exchange medium.

[0072] In an optional embodiment of the present invention, the inner wall surface of the condensation zone 1013 has a super-lyophobic layer, and the contact angle between the super-lyophobic layer and the liquid heat exchange medium is greater than 150 degrees, so that the droplets formed after the heat exchange medium condenses on the inner wall surface of the condensation zone 1013 adhere to the inner wall surface of the condensation zone 1013 and are easily separated from the inner wall surface of the condensation zone 1013. As a result, when two or more adjacent droplets contact and merge, the droplets bounce and are absorbed by the condensation capillary liquid absorption portion 203. Because two or more adjacent droplets contact and merge to form larger droplets, the surface area of ​​the larger droplet after the merger is smaller than the sum of the surface areas of the multiple droplets before the merger, that is, the potential energy of the larger droplet after the merger is smaller than the sum of the potential energies of the multiple droplets before the merger. The reduced potential energy is converted into kinetic energy, which causes the droplets to spontaneously bounce in a certain direction when they contact and merge, thereby achieving the transfer of the droplets from the inner wall surface of the condensation zone 1013 to the condensation capillary liquid absorption portion 203. Through the above arrangement, when the heat pipe heat exchanger is in operation, the large-scale micron-sized droplets or submicron-sized droplets on the inner wall surface of the condensation zone 1013 can be controlled to spontaneously and directionally bounce toward the condensation capillary liquid suction portion 203 .

[0073] In an optional embodiment of the present invention, Figure 1 、 Figures 4 to 6 As shown, the inner wall surface of the condensation zone 1013 is provided with a microstructure unit 1014, which realizes the transformation from film-like (condensation forms a liquid film) condensation to bead-like (condensation forms droplets) condensation, thereby improving the heat exchange capacity of the heat pipe; in addition, the setting of the microstructure unit 1014 can limit the volume of the droplets condensed on the inner wall surface of the condensation zone 1013, thereby promoting the contact and merging of the droplets, making the droplets more likely to bounce, and reducing the dissipation of the droplet merging energy.

[0074] In the present invention, the microstructure units 1014 are a plurality of grooves or a plurality of pits. When the microstructure units 1014 are a plurality of grooves in a long strip shape, as shown in FIG. Figure 4 and Figure 5 As shown, a plurality of grooves are spaced apart along the circumference of the condensation zone 1013 and are evenly distributed on the inner wall surface of the condensation zone 1013, and each groove extends along the axial direction of the condensation zone 1013. When the microstructure unit 1014 is a plurality of pits, as shown in FIG. Figure 6 As shown, a plurality of pits are arranged in an array on the inner wall surface of the condensation area 1013 .

[0075] Furthermore, when the microstructure unit 1014 is a plurality of grooves, the width of the grooves may be, but is not limited to, 10 μm to 500 μm, and / or the depth of the grooves may be, but is not limited to, 10 μm to 500 μm.

[0076] Furthermore, when the microstructure unit 1014 is a plurality of grooves, the inner wall of the groove may be in a multi-step structure to achieve the purpose of improving the jumping ability of the droplet.

[0077] Further, such as Figure 6 As shown, when the microstructure unit 1014 is a plurality of pits, the diameter of the pits or the maximum spacing between the inner walls of the pits is 5 μm to 50 μm, and / or the depth of the pits is 2 μm to 20 μm, and / or the spacing between two adjacent pits is 0.5 μm to 5 μm. The pits may be centrally symmetrical, such as triangular, square, hexagonal, or circular.

[0078] The working principle of the heat pipe heat exchanger based on condensate droplet bouncing of the present invention is as follows: Figure 7 As shown, under the action of the heat source area, the liquid heat exchange medium in the evaporation capillary liquid absorption portion 201 in the evaporation area 1011 absorbs heat and evaporates to become a gaseous heat exchange medium. The gaseous heat exchange medium flows from the evaporation area 1011 to the transport area 1012 in the hollow chamber 101, and then flows from the transport area 1012 to the condensation area 1013. The gaseous heat exchange medium condenses and releases heat in the condensation area 1013. The released heat is transferred to the shell and tube 1 and released to the outside. In this process, the microstructure units of the gaseous heat exchange medium on the inner wall surface of the condensation area 1013 The liquid condenses on 1014 into micron-sized droplets or submicron-sized droplets. When two or more adjacent droplets come into contact and merge, they spontaneously bounce toward the condensation capillary liquid absorption portion 203 and are absorbed by the condensation capillary liquid absorption portion 203. The liquid heat exchange medium absorbed by the condensation capillary liquid absorption portion 203 is driven by the capillary force to move along the transport capillary liquid absorption portion 202 to the evaporation capillary liquid absorption portion 201, and then returns to the evaporation area 1011, and the above process is repeated, thereby forming a heat transfer process of "evaporation → condensation → bouncing → return" of the heat exchange medium.

[0079] The characteristics and advantages of the heat pipe heat exchanger based on condensate droplet bouncing of the present invention are:

[0080] 1. This heat pipe heat exchanger based on the bouncing of condensed droplets relies solely on the kinetic energy generated by the bouncing of condensed droplets and the capillary force provided by the capillary wicking structure 2 itself to drive the operation of the heat pipe heat exchanger, breaking through the capillary limit of existing heat pipe heat exchangers. The super-lyophilic layer on the surface of the capillary wicking structure 2 and the connection between the evaporation capillary wicking part 201 and the condensation capillary wicking part 203 through the transport capillary wicking part 202 can effectively extend the heat transfer distance, realize the effective long-distance circulation of the heat pipe, and effectively improve the heat exchange effect.

[0081] Second, the heat pipe heat exchanger based on the bouncing of condensation droplets physically eliminates the limitation of capillary wick thermal resistance on heat transfer capacity, realizes the transformation from film-like (condensation forms liquid film) condensation to bead-like (condensation forms droplets) condensation, and improves the heat transfer capacity of the heat pipe.

[0082] 3. In the heat pipe heat exchanger based on the bouncing of condensed droplets, the microstructure units 1014 on the inner wall surface of the condensation area 1013 can limit the maximum size of the condensed droplets to the micron or submicron range, thereby enhancing the jumping ability of the condensed droplets and enabling faster and more recovery of the liquid heat exchange medium condensed on the inner wall surface of the condensation area 1013.

[0083] 4. In this heat pipe heat exchanger based on the bouncing of condensed droplets, the capillary sorption structure 2 is made of a porous material, which expands the evaporation area. The super-lyophilic layer on the surface of the capillary sorption structure 2 can evenly spread the recovered liquid heat exchange medium on the inner wall surface of the evaporation capillary sorption portion 201 and evaporate it into high-temperature heat exchange medium vapor to achieve the purpose of removing heat, thereby greatly improving the heat exchange efficiency of the evaporation zone 1011 and the boiling limit of the heat pipe.

[0084] Implementation Method 2

[0085] like Figures 1 to 7 As shown, the present invention provides a heat exchange method based on condensate droplet bouncing, which is implemented using the above-mentioned heat pipe heat exchanger based on condensate droplet bouncing. The heat exchange method includes the following steps:

[0086] Step S1: arranging the evaporation zone 1011 in the heat source area requiring heat exchange;

[0087] Step S2: The heat exchange medium in the evaporation zone 1011 flows in gaseous form (i.e., gaseous heat exchange medium) from the evaporation zone 1011 through the transport zone 1012 and flows to the condensation zone 1013;

[0088] In step S2 , the original gaseous heat exchange medium in the evaporation zone 1011 or the gaseous heat exchange medium evaporated to the evaporation zone 1011 by the liquid heat exchange working fluid on the evaporation capillary liquid suction part 201 .

[0089] Step S3: The gaseous heat exchange medium in the condensation zone 1013 is condensed into liquid droplets (i.e., liquid heat exchange medium) on the inner wall of the condensation zone 1013;

[0090] Step S4: At least a portion of the liquid droplets located on the inner wall of the condensation area 1013 bounces to the condensation capillary liquid absorption portion 203;

[0091] Step S5: The liquid heat exchange medium on the condensation capillary liquid suction portion 203 is transported to the evaporation capillary liquid suction portion 201 via the transport capillary liquid suction portion 202;

[0092] Step S6: The liquid heat exchange medium on the evaporation capillary liquid suction portion 201 is heated and evaporated in the heat source area to form a gaseous heat exchange medium, which then enters the evaporation area 1011;

[0093] Step S7: loop the above steps S1 to S6.

[0094] Furthermore, in step S4 , the droplets that bounce from the inner wall of the condensation area 1013 to the condensation capillary liquid suction portion 203 are micron-sized droplets or submicron-sized droplets.

[0095] Furthermore, in step S4 , a plurality of liquid droplets located close to each other on the inner wall of the condensation area 1013 contact and merge and then bounce toward the condensation capillary liquid suction portion 203 .

[0096] In an optional embodiment of the present invention, the evaporation capillary liquid absorption portion 201, the transport capillary liquid absorption portion 202 and the condensation capillary liquid absorption portion 203 can be pre-formed as one piece, so that the capillary liquid absorption structure 2 is an integral structure; of course, the evaporation capillary liquid absorption portion 201, the transport capillary liquid absorption portion 202 and the condensation capillary liquid absorption portion 203 can also be formed separately, and then the evaporation capillary liquid absorption portion 201, the transport capillary liquid absorption portion 202 and the condensation capillary liquid absorption portion 203 are connected; or the evaporation capillary liquid absorption portion 201, the transport capillary liquid absorption portion 202 and the condensation capillary liquid absorption portion 203 are connected. After the fine liquid suction portion 201, the transport capillary liquid suction portion 202 and the condensation capillary liquid suction portion 203 are installed in the tube shell 1, it is ensured that the positions between the evaporation capillary liquid suction portion 201, the transport capillary liquid suction portion 202 and the condensation capillary liquid suction portion 203 where the liquid heat exchange medium needs to pass through are tightly fitted to ensure that the liquid heat exchange medium can be transferred from the condensation capillary liquid suction portion 203 to the transport capillary liquid suction portion 202, and then transferred from the transport capillary liquid suction portion 202 to the evaporation capillary liquid suction portion 201 under the action of capillary force.

[0097] The heat exchange method based on condensed liquid droplet bouncing of the present invention has the same characteristics and advantages as the above-mentioned heat pipe heat exchanger based on condensed liquid droplet bouncing, which will not be described in detail here.

[0098] It should be noted that, in the description of this application, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be understood to indicate or imply relative importance. Furthermore, in the description of this application, unless otherwise specified, "plurality" means two or more.

[0099] The above-mentioned various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0100] The above are only a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as above, the contents are only for the purpose of facilitating understanding of the present invention and are not intended to limit the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A heat pipe heat exchanger based on condensate droplet bouncing, characterized in that: The heat pipe heat exchanger based on condensate droplet bouncing includes: A tube shell, wherein the tube shell has a hollow chamber, wherein the hollow chamber has a heat exchange medium, and wherein the hollow chamber is sequentially formed with an evaporation zone, a transport zone, and a condensation zone that are interconnected along a first direction; A capillary liquid absorption structure made of a porous material, the capillary liquid absorption structure comprising an evaporation capillary liquid absorption portion, a transport capillary liquid absorption portion and a condensation capillary liquid absorption portion; The evaporation capillary liquid absorption portion is in a layered structure adapted to the evaporation region, and the evaporation capillary liquid absorption portion is covered on the inner wall of the evaporation region; The transport capillary liquid absorbing portion is a columnar structure, is located in the hollow chamber and extends from the evaporation zone to the condensation zone along the first direction, and one end of the transport capillary liquid absorbing portion is located in the evaporation zone and is connected to the evaporation capillary liquid absorbing portion; The condensation capillary liquid absorption portion is a plurality of columnar structures, and the condensation capillary liquid absorption portions of the plurality of columnar structures are located in the condensation zone and are arranged in a divergent manner along the circumference of the transport capillary liquid absorption portion. One end of the condensation capillary liquid absorption portion of each columnar structure is connected to or tightly fitted with the transport capillary liquid absorption portion, and the other end of the condensation capillary liquid absorption portion of each columnar structure extends to a position in contact with or close to the inner wall of the condensation zone.

2. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 1, characterized in that: The condensation capillary liquid absorption parts of the plurality of columnar structures are divided into a plurality of groups, and the condensation capillary liquid absorption parts in the plurality of groups are arranged at intervals along the extension direction of the transport capillary liquid absorption part; The plurality of condensation capillary liquid suction portions in at least two adjacent groups are staggered in the extending direction of the transport capillary liquid suction portion.

3. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 2, characterized in that: The condensation capillary liquid suction portions in two adjacent groups are spaced at equal distances along the extending direction of the transport capillary liquid suction portion.

4. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 1, characterized in that: The surface of the capillary liquid absorption structure has a super liquid-philic layer.

5. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 4, characterized in that: The contact angle between the super lyophilic layer and the heat exchange medium in liquid form is less than 5°.

6. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 1, characterized in that: The inner wall surface of the condensation zone has a super liquid-repellent layer.

7. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 6, characterized in that: The contact angle between the super-lyophobic layer and the liquid heat exchange medium is greater than 150°.

8. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 6 or 7, characterized in that: The inner wall surface of the condensation zone is provided with microstructure units; The microstructure unit includes a plurality of strip-shaped grooves, the plurality of grooves are distributed on the inner wall surface of the condensation zone at intervals along the circumference of the condensation zone, and each of the grooves extends along the axial direction of the condensation zone; And / or, the microstructure unit includes a plurality of pits, and the plurality of pits are arranged in an array on the inner wall surface of the condensation zone.

9. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 8, characterized in that: When the microstructure unit includes a plurality of the grooves, the width of the grooves is 10 μm to 500 μm, and / or the depth of the grooves is 10 μm to 500 μm.

10. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 8, characterized in that: When the microstructure unit includes a plurality of the grooves, the inner walls of the grooves have a multi-step structure.

11. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 8, characterized in that: When the microstructure unit includes a plurality of pits, the diameter of the pits or the maximum spacing between the inner walls of the pits is 5 μm to 50 μm, and / or the depth of the pits is 2 μm to 20 μm, and / or the spacing between two adjacent pits is 0.5 μm to 5 μm.

12. The heat pipe heat exchanger based on condensate droplet bouncing according to claim 1, characterized in that: A support tube is provided inside the capillary liquid transport portion along its extending direction, and two ends of the support tube are respectively connected to two opposite inner walls of the tube shell.

13. A heat exchange method based on condensate droplet bouncing, which is implemented using the heat pipe heat exchanger based on condensate droplet bouncing according to any one of claims 1 to 12, characterized in that: The heat exchange method comprises the following steps: Step S1: arranging the evaporation zone in the heat source area requiring heat exchange; Step S2: the heat exchange medium in the evaporation zone flows from the evaporation zone through the transport zone to the condensation zone in a gaseous form; Step S3: The gaseous heat exchange medium in the condensation zone is condensed into liquid droplets on the inner wall of the condensation zone; Step S4: at least part of the liquid droplets located on the inner wall of the condensation zone bounces to the condensation capillary liquid absorption portion; Step S5: transporting the liquid heat exchange medium on the condensation capillary liquid absorption portion to the evaporation capillary liquid absorption portion via the transport capillary liquid absorption portion; Step S6: The liquid heat exchange medium on the evaporation capillary liquid absorption portion is heated and evaporated in the heat source area to form a gaseous heat exchange medium, which then enters the evaporation area; Step S7: looping the above steps S1 to S6.

14. The heat exchange method based on condensate droplet bouncing according to claim 13, characterized in that: In the step S4, the droplets that bounce from the inner wall of the condensation zone to the condensation capillary liquid absorption portion are micron-sized droplets or submicron-sized droplets.

15. The heat exchange method based on condensate droplet bouncing according to claim 14, characterized in that: In step S4, a plurality of adjacent liquid droplets on the inner wall of the condensation zone are brought into contact and merged and then bounce toward the condensation capillary liquid absorption portion.

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