Device and method for preparing porous heat transfer coating on surface of metal pipe

Abstract

The invention relates to a device and method for preparing a porous heat transfer coating on the surface of a metal pipe. The metal pipe penetrates through a discharge port of the material storage mechanism; a film covering mechanism; the shaping wheel is in contact with the film and extrudes the material; the illumination mechanism illuminates the materials; the laser device is used for cladding the material on the surface of the metal pipe; the clamping rod penetrates through and outwards supports the metal pipe; the moving device pulls the clamping rod to move; wherein the moving device is movably arranged on the guide rail; the film covering mechanism is used for winding a film on the shaping wheel; the storage mechanism, the shaping wheel and the laser device are sequentially arranged on the guide rail in the moving direction of a metal pipe; and the illumination mechanisms are arranged among the material storage mechanism, the shaping wheel and the laser device at intervals. The problems that in an existing scheme, the thickness of a porous heat transfer coating is inconsistent, a porous structure of a complex structure cannot be formed, and the heat exchange efficiency is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of porous heat transfer tubes, and in particular to a device and a method for preparing a porous heat transfer coating on the surface of a metal tube. Background Art

[0002] The porous heat transfer coating on the heat transfer porous tube is prepared by first applying glue on the surface of the metal tube, then spraying metal powder on the glue, and after the glue is dried, the metal powder is melted onto the surface of the metal tube by laser to form a porous heat transfer coating.

[0003] Such a preparation method will lead to inconsistent thickness of porous heat transfer coating due to uneven metal powder spraying, which will affect the heat exchange efficiency. At the same time, due to the limited adhesion thickness of the glue to the metal powder, it is impossible to form a porous structure with a complex structure, thus affecting the heat exchange efficiency.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a device and method for preparing a porous heat transfer coating on the surface of a metal tube, so as to solve the problem in the prior art that the thickness of the porous heat transfer coating is inconsistent, a porous structure with a complex structure cannot be formed, and the heat exchange efficiency is affected.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A porous heat transfer coating is prepared on the surface of a metal tube;

[0008] It includes: a guide rail; a material storage mechanism, the metal tube passes through the material outlet of the material storage mechanism; a film coating mechanism; a shaping wheel, which contacts the film and squeezes the material; an irradiation mechanism, which irradiates the material; a laser device, which melts the material on the surface of the metal tube; a clamping rod, which penetrates and supports the metal tube outward; and a moving device, which pulls the clamping rod to move;

[0009] Among them, the moving device is movably arranged on the guide rail; the laminating mechanism winds the film around the shaping wheel; the material storage mechanism, the shaping wheel and the laser device are arranged in sequence on the guide rail along the moving direction of the metal tube; the illumination mechanism is arranged at intervals between the material storage mechanism, the shaping wheel and the laser device.

[0010] A further technical solution is that the material storage mechanism includes: a material storage cylinder, a covering cylinder connected to the material storage cylinder and a scraper arranged around the metal tube; the metal tube passes through the covering cylinder; the scraper is arranged at the outlet of the covering cylinder and expands or contracts.

[0011] A further technical solution is that the laminating mechanism includes: a discharge wheel, a receiving wheel and a film pressing wheel arranged oppositely; a first convex portion and a first concave portion are formed on the opposite film pressing wheels; a second convex portion is formed on the receiving wheel; two ends of the film are respectively wound on the discharge wheel and the receiving wheel; the film is wound on the shaping wheel after passing through the film pressing wheel oppositely; the first convex portion is embedded in the first concave portion to hot-press the film into shape; and the second convex portion pushes the film forming position outward to tension it.

[0012] A further technical solution is that the device for preparing a porous heat transfer coating on the surface of a metal tube further comprises:

[0013] An adjustment bracket and a blowing device arranged on the adjustment bracket; the shaping wheels are relatively movably arranged on the adjustment bracket; the metal tube passes through between the shaping wheels; the blowing end of the blowing device faces the film on the shaping wheel and is distributed along the moving direction of the film.

[0014] A further technical solution is that the clamping rod includes: a main rod passing through the metal tube, a guide rod slidably arranged on the main rod, and an external support member hinged on the guide rod; when the guide rod moves along the main rod, the external support member supports the metal tube outward; when the guide rod moves in the opposite direction along the main rod, the external support member detaches from the metal tube.

[0015] A further technical solution is that the moving device includes a moving base plate, a roller rotatably arranged on the moving base plate, a moving plate movably arranged on the moving base plate, a screw rod rotatably arranged on the moving base plate and a clamping claw arranged on the moving plate; wherein, the roller rolls along the guide rail; the moving plate is threadedly connected to the screw rod; the screw rod rotates to drive the moving plate to move along the moving base plate, and the moving plate drives the clamping claw to pull the clamping rod.

[0016] A method for preparing a porous heat transfer coating on the surface of a metal tube comprises the following steps:

[0017] Clamping steps: the clamping rod penetrates and supports the metal pipe outward; the moving plate moves to the clamping rod, and the clamping claw pulls one end of the clamping rod;

[0018] Moving steps: the moving bottom plate moves along the guide rail at a certain speed, and drives the metal tube to approach the discharge port of the storage mechanism, the shaping wheel, the illumination mechanism and the laser device in sequence;

[0019] Material covering step: the material is mixed in the storage barrel, the metal tube passes through the covering barrel, and the material covers the outer surface of the metal tube; the scraper expands or contracts to control the thickness of the material covering;

[0020] Forming steps: the film passes between the film pressing wheels, and after the hot pressing film is formed, it is wound on the shaping wheel; the metal tube passes between the shaping wheels to complete the shaping of the material; the blowing device transfers heat to the film, and the film shrinks; the blowing device blows the film up and away from the material, and the collecting wheel recovers the film;

[0021] Cladding steps: the lighting mechanism irradiates the material to solidify the material; the laser device acts on the material with a certain power.

[0022] A further technical solution is that the materials include: a binder, a first metal powder and a second metal powder; the first metal powder: the second metal powder = 7:3; the binder is 10-15 parts; the first metal powder + the second metal powder is 20-105 parts.

[0023] A further technical solution is that the melting temperature of the first metal powder is less than the temperature at which the laser device acts on the material; the melting temperature of the second metal powder is greater than the temperature at which the laser device acts on the material; the diameter of the second metal powder is greater than the diameter of the first metal powder; and the first metal powder includes several metal particles of different diameters.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are as follows: (1) the metal tube passes through the discharge port of the storage mechanism, and the material is coated on the outer surface of the metal tube; the coating mechanism winds the film on the shaping wheel, and when the shaping wheel extrude the shaping material, the material is prevented from sticking to the shaping wheel; after the material is laser clad, a porous layer is formed on the outer surface of the metal tube, and the material is mixed with metal powder and a binder, and the distribution of the metal powder can be controlled, thereby controlling the path of the pores in the porous layer to improve the heat dissipation capacity of the porous layer on the metal tube; the covering thickness of the material is controlled through the discharge port of the storage mechanism, the material is rolled by the shaping wheel to ensure the uniformity of the material coverage, and the material is clad by the laser device; in order to prevent the material from sticking to the shaping wheel, the film is wound on the shaping wheel, and the shaping wheel completes the rolling of the material, and then the film is recovered.

[0025] (2) The blowing device at the film moving-in position blows out cold air, which is used to cool and harden the film; the film is heated and formed when passing through the film pressing wheel, and the film needs to be cooled before being wound on the shaping wheel; the blowing device at the position between the shaping wheels and close to the film moving-out direction blows out hot air, which heats the film. After the heated film moves out of the shaping wheel close to the film moving-out direction, the heated film wrinkles. The blowing device at the film moving-out position blows out cold air, which cools and hardens the wrinkled film. Under the action of the cold air, the wrinkled film separates from the material and is wound on the receiving wheel for recovery.

[0026] (3) The metal tubes are pulled by a pull rod, and the mobile device pulls a group of metal tubes for preparation, and the next group of metal tubes is moved by the pull rod, thereby realizing the rapid preparation of the metal tubes; one end of the pull rod is hooked on the clamping rod in a group of metal tubes, and the other end of the pull rod is hooked on the clamping rod in the next group of metal tubes; the clamping claw can pull the metal tube by clamping the pull rod; when a group of metal tubes is prepared, the pull rod on a group of metal tubes and a group of metal tubes are removed, the mobile device moves to reset, and the clamping claw re-clamps the pull rod on the next group of metal tubes, thereby preparing the next group of metal tubes, thereby realizing the continuous preparation of metal tubes and improving production efficiency.

[0027] (4) Hot medium flows in the metal tube, and cold medium flows outside the metal tube. The cold medium flows into the channel. As the number of channels increases, more cold medium flows into the channel, which improves the heat exchange efficiency. The heat of the hot medium is transferred to the cold medium in the channel, and bubbles are generated in the cold medium in the channel. After the bubble diameter gradually increases, it flows out along the channel. Since the length of the channel is long and the inner surface of the channel is uneven, the surface of the inner surface of the channel is increased, and the number of bubbles generated is increased. Due to the long length of the channel, the flow time of the bubbles in the channel is increased, the heat absorbed by the bubbles is increased, and the heat exchange efficiency is improved. In addition, the inner surface of the channel is uneven, and the bubbles cannot flow smoothly along the channel, which further increases the flow time of the bubbles in the channel. The heat absorbed by the bubbles increases again, further improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of a device for preparing a porous heat transfer coating on the surface of a metal tube according to an embodiment of the present invention is shown.

[0029] Figure 2 Shows Figure 1 Enlarged structural diagram of point A in the middle.

[0030] Figure 3 The schematic diagram of the structure of the scraper member according to the embodiment of the present invention is shown.

[0031] Figure 4 The schematic diagram of the structure of the laminating mechanism and the shaping wheel according to the embodiment of the present invention is shown.

[0032] Markings in the accompanying drawings: 1. guide rail; 2. material storage mechanism; 21. material storage cylinder; 22. material covering cylinder; 221. outlet cylinder; 222. incision; 223. cylinder cover; 23. scraper; 24. cylinder plate; 25. electric push rod; 3. film coating mechanism; 31. material discharge wheel; 32. material collection wheel; 33. film pressing wheel; 34. first convex part; 35. first concave part; 36. second convex part; 4. shaping wheel; 41. adjustment bracket; 42. blowing device; 5. illumination mechanism; 6. laser device; 7. clamping rod; 71. main rod; 711. rod plate; 72. guide rod; 73. outer support member; 74. ring sleeve; 8. moving device; 81. moving bottom plate; 82. roller; 83. moving plate; 84. screw rod; 85. clamping claw. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention clearer, the device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0034] First embodiment:

[0035] Figure 1 A schematic structural diagram of a device for preparing a porous heat transfer coating on the surface of a metal tube according to an embodiment of the present invention is shown. Figure 2 Shows Figure 1 Enlarged structural diagram of point A in the middle. Figure 3 The schematic diagram of the structure of the scraper member according to the embodiment of the present invention is shown. Figure 4 The structure diagram of the laminating mechanism and the shaping wheel according to the embodiment of the present invention is shown. Figure 1-Figure 4 As shown, the present invention discloses a device for preparing a porous heat transfer coating on the surface of a metal tube.

[0036] The device for preparing a porous heat transfer coating on the surface of a metal tube comprises: a moving device 8, a guide rail 1, a material storage mechanism 2, a coating mechanism 3, a shaping wheel 4 for contacting a film and squeezing a material, a lighting mechanism 5 for irradiating the material, a laser device 6 for melting the material onto the surface of the metal tube, and a clamping rod 7 that penetrates and supports the metal tube outward.

[0037] The guide rail 1 is arranged in the left-right direction. On the guide rail 1, along the moving direction of the metal tube, the storage mechanism 2, the shaping wheel 4 and the laser device 6 are arranged from left to right. Exemplarily, the illumination mechanism 5 is a plurality of groups. The illumination mechanism 5 is arranged at intervals between the storage mechanism 2, the shaping wheel 4 and the laser device 6. The moving device 8 is arranged on the guide rail 1, and the moving device 8 is located at one end of the metal tube and clamps one end of the clamping rod 7 respectively. The moving device 8 drives the metal tube to move rightward along the guide rail 1.

[0038] The metal tube passes through the discharge port of the storage mechanism 2, and the material is coated on the outer surface of the metal tube. The film coating mechanism 3 winds the film on the shaping wheel 4, and when the shaping wheel 4 squeezes the shaping material, the material is prevented from sticking to the shaping wheel 4.

[0039] After laser cladding of the material, a porous layer is formed on the outer surface of the metal tube. The material is a mixture of metal powder and a binder. The distribution of the metal powder can be controlled, thereby controlling the path of the holes in the porous layer to improve the heat dissipation capacity of the porous layer on the metal tube.

[0040] The material coverage thickness is controlled by the material outlet of the material storage mechanism 2, the material is rolled by the shaping wheel 4 to ensure the uniformity of the material coverage, and the material is melted by the laser device 6. In order to prevent the material from sticking to the shaping wheel 4, a film is wound on the shaping wheel 4, and the film is recovered after the shaping wheel 4 completes the rolling of the material.

[0041] The illumination mechanism 5 is disposed at intervals between the material storage mechanism 2, the shaping wheel 4 and the laser device 6. The material does not solidify quickly but solidifies slowly before and after the shaping wheel 4 is rolled, thereby ensuring smooth detachment of the film.

[0042] The material storage mechanism 2 comprises: a material storage barrel 21, a covering barrel 22 communicating with the material storage barrel 21, and a scraper 23 arranged around the metal tube. The metal tube passes through the covering barrel 22. The scraper 23 is arranged at the outlet of the covering barrel 22 and expands or contracts.

[0043] The lower end of the material storage barrel 21 is connected to the upper end of the covering barrel 22. A barrel plate 24 is slidably arranged in the material storage barrel 21, and the barrel plate 24 is in contact with the inner surface of the material storage barrel 21. An electric push rod 25 is arranged at the upper end of the material storage barrel 21. The barrel plate 24 is connected to the driving end of the electric push rod 25. The mixed material is stored in the material storage barrel 21, and the electric push rod 25 pushes the barrel plate 24 to move downward, and the barrel plate 24 squeezes the material downward, and the material enters the covering barrel 22 from the material storage barrel 21.

[0044] The scraper 23 comprises an outlet tube 221 disposed at the outlet of the covering tube 22, and the metal tube passes through the outlet tube 221. Notches 222 are formed at both ends of the outlet tube 221, and the notches 222 at both ends are arranged alternately.

[0045] The scraper 23 also includes cylinder covers 223 disposed at both ends of the outlet cylinder 221, and the cylinder covers 223 at both ends are threadedly connected to each other. After the cylinder covers 223 are rotated, the cylinder covers 223 are close to each other, and the cylinder covers 223 squeeze the outlet cylinder 221, and the spacing of the cutouts 222 is squeezed and reduced, and the aperture of the outlet cylinder 221 is reduced. When the metal tube passes through the outlet cylinder 221, the outlet cylinder 221 can accurately control the thickness of the material on the metal tube.

[0046] The film coating mechanism 3 comprises: a discharge wheel 31, a receiving wheel 32 and an oppositely arranged film pressing wheel 33. A first convex portion 34 and a first concave portion 35 are formed on the opposite film pressing wheel 33. A second convex portion 36 is formed on the receiving wheel 32. The two ends of the film are respectively wound on the discharge wheel 31 and the receiving wheel 32.

[0047] Grooves are formed around the shaping wheel 4, and the shaping wheels 4 are arranged opposite to each other, and the metal tube passes through the grooves of the shaping wheels 4 arranged opposite to each other. If the film is directly wound on the shaping wheel 4, the film will form wrinkles and piles in the grooves of the shaping wheel 4, and the surface quality of the material will be affected when the shaping wheel 4 squeezes the material. In order to make the shape of the film fit the grooves of the shaping wheel 4 when the film is wound on the shaping wheel 4, the film needs to be molded.

[0048] The film pressing wheel 33 is heated by the induction coil, the temperature of the film pressing wheel 33 is measured by the sensor, and the temperature of the film pressing wheel 33 is controlled by controlling the power of the induction coil. After the film passes through the relative film pressing wheel 33, the film is wound on the shaping wheel 4, and the first convex part 34 is embedded in the first concave part 35 to heat press the film into shape, and the film can be adapted to the groove of the shaping wheel 4 after being shaped.

[0049] When the film is recycled, the film is folded. To ensure uniform pulling of each position of the film, the second protrusion 36 is used to push the film forming position outward to tension it, so as to avoid pulling of the film during the recycling process.

[0050] The device for preparing a porous heat transfer coating on the surface of a metal tube also includes:

[0051] The adjusting bracket 41 and the blowing device 42 arranged on the adjusting bracket 41. The shaping wheels 4 are relatively movably arranged on the adjusting bracket 41, and the shaping wheels 4 are made to move closer to or farther away from each other by adjusting the position of the shaping wheels 4 on the adjusting bracket 41. When the shaping wheels 4 move closer to each other, the thickness of the material on the metal tube gradually decreases. When the shaping wheels 4 move away from each other, the thickness of the material on the metal tube gradually increases.

[0052] The metal tube passes through between the shaping wheels 4. There are multiple groups of shaping wheels 4 arranged relatively to each other. The multiple groups of shaping wheels 4 repeatedly roll the material to strictly control the thickness of the material and ensure that the thickness of the material is evenly distributed.

[0053] There are multiple groups of air blowing devices 42. The air blowing devices 42 are respectively located at the film moving-in position, the position between the shaping wheels 4 close to the film moving-out direction, and the film moving-out position. The blowing end of the air blowing device 42 faces the film on the shaping wheel 4, and the air blowing devices 42 are distributed along the moving direction of the film.

[0054] The blowing device 42 at the moving-in position of the film blows out cold air, which is used to cool and harden the film. The film is heated and formed when passing through the film pressing wheel 33, and the film needs to be cooled and wound on the shaping wheel 4.

[0055] The blowing device 42 between the shaping wheels 4 and near the film moving direction blows out hot air, which heats the film. After the heated film moves out of the shaping wheel 4 near the film moving direction, the heated film becomes wrinkled. The blowing device 42 at the film moving-out position blows out cold air, which cools and hardens the wrinkled film. Under the action of the cold air, the wrinkled film is separated from the material and is wrapped around the receiving wheel 32 for recovery.

[0056] The clamping rod 7 comprises: a main rod 71 penetrating the metal tube in the left-right direction, a guide rod 72 slidably arranged on the main rod 71 , and an outer support member 73 hinged on the guide rod 72 .

[0057] Exemplarily, there are multiple groups of guide rods 72. The number of external support members 73 corresponds to the number of guide rods 72. The guide rods 72 are arranged in the left and right directions, and the guide rods 72 are spaced around the main rod 71. Adjacent guide rods 72 are connected to each other. A rod groove is formed on the outer surface of the main rod 71 in the left and right directions, and the guide rod 72 is placed in the rod groove and slides along the rod groove. The external support members 73 are distributed around the inner surface of the metal tube.

[0058] Rod plates 711 are arranged in parallel on the main rod 71, and the rod plates 711 are perpendicular to the main rod 71. When the guide rod 72 moves close to the rod plate 711, the outer support member 73 contacts the rod plate 711, and the guide rod 72 continues to move to push the outer support member 73 to swing outward along the rod plate 711, and the outer support member 73 contacts the inner surface of the metal pipe to support the metal pipe outward.

[0059] The main rod 71 is threadedly connected with a ring sleeve 74. The position of the ring sleeve 74 on the main rod 71 is moved by rotating the ring sleeve 74. The ring sleeve 74 restrains the outer support member 73 by resisting the guide rod 72, so that the outer support member 73 can continuously support the metal pipe outward.

[0060] When the guide rod 72 moves along the main rod 71, the outer support member 73 supports the metal pipe outward. When the guide rod 72 moves in the opposite direction along the main rod 71, the outer support member 73 separates from the metal pipe.

[0061] The moving device 8 includes a moving base plate 81 , a roller 82 rotatably disposed on the moving base plate 81 , a moving plate 83 movably disposed on the moving base plate 81 , a screw rod 84 rotatably disposed on the moving base plate 81 , and a clamping claw 85 disposed on the moving plate 83 .

[0062] The first motor and the second motor are also installed on the moving bottom plate 81, and the first motor drives the roller 82 to roll along the guide rail 1. The lower end of the moving plate 83 is threadedly connected to the screw rod 84, and the second motor drives the screw rod 84 to rotate.

[0063] Exemplarily, the clamp 85 is a pneumatic clamp. The second motor drives the screw 84 to rotate and drive the moving plate 83 to move along the moving bottom plate 81, and the moving plate 83 drives the clamp 85 to clamp one end of the clamping rod 7. The first motor drives the roller 82 to roll along the guide rail 1, driving the moving device 8, the clamping rod 7 and the metal tube to move along the guide rail 1, so that the metal tube is sequentially subjected to the material storage mechanism 2 to coat the material on the metal tube surface, the light irradiation mechanism 5 to irradiate the solidified material, the shaping wheel 4 to roll and shape the material on the metal tube, the light irradiation mechanism 5 to irradiate the solidified material and the laser device 6 to melt the material on the metal tube surface.

[0064] The metal tubes are pulled by the pull rod, and the moving device 8 pulls a group of metal tubes for preparation, and the next group of metal tubes is moved by the pull rod, thereby realizing the rapid preparation of the metal tubes. One end of the pull rod hooks the clamping rod 7 in a group of metal tubes, and the other end of the pull rod hooks the clamping rod 7 in the next group of metal tubes. The clamp 85 can pull the metal tube by clamping the pull rod. When a group of metal tubes is prepared, the pull rods on a group of metal tubes and a group of metal tubes are removed, the moving device 8 moves and resets, and the clamp 85 re-clamps the pull rods on the next group of metal tubes, thereby preparing the next group of metal tubes, thereby realizing the continuous preparation of metal tubes and improving production efficiency.

[0065] Second embodiment:

[0066] A method for preparing a porous heat transfer coating on a metal tube surface comprises the following steps:

[0067] Clamping steps: Before covering the surface of the metal tube with material, firstly pass the clamping rod 7 through and support the metal tube outwardly.

[0068] The main rod 71 passes through the metal tube in the left and right directions and pushes the guide rod 72 toward the rod plate 711. After the outer support member 73 contacts the rod plate 711, the outer support member 73 swings outward to support the metal tube under the action of the guide rod 72, and the ring sleeve 74 is rotated to support the guide rod 72.

[0069] The clamping rod 7 and the metal pipe are hoisted and moved close to the moving device 8. The first motor drives the roller 82 to roll along the guide rail 1 to drive the moving base plate 81 to move close to the metal pipe. The second motor drives the screw rod 84 to rotate to drive the moving plate 83 to move. The moving plate 83 drives the clamping claw 85 to clamp the pull rod on the clamping rod 7.

[0070] Moving step: The moving bottom plate 81 moves along the guide rail 1 at a certain speed, and drives the metal tube to approach the discharge port of the storage mechanism 2, the shaping wheel 4, the illumination mechanism 5 and the laser device 6 in sequence.

[0071] The first motor drives the roller 82 to roll along the guide rail 1 to drive the movable base plate 81 to move, and the movable base plate 81 drives the metal tube to sequentially carry out the material storage mechanism 2 to coat the material on the surface of the metal tube, the lighting mechanism 5 to irradiate the solidified material, the shaping wheel 4 to roll and shape the material on the metal tube, the lighting mechanism 5 to irradiate the solidified material and the laser device 6 to melt the material on the surface of the metal tube.

[0072] Material coating step: the material storage cylinder 21 is mixed with materials, the moving device 8 drives the metal tube to move through the material coating cylinder 22, and the materials cover the outer surface of the metal tube. The scraper 23 expands or contracts to control the thickness of the material coating.

[0073] The cylinder covers 223 are screwed together and brought closer to each other, so that the cylinder covers 223 squeeze the outlet cylinder 221, and the cutout 222 is squeezed and shrunk, so that the aperture of the outlet cylinder 221 is reduced and the thickness of the material is reduced.

[0074] The cylinder covers 223 are loosened from each other and moved away from each other, so that the cylinder covers 223 no longer squeeze the outlet cylinder 221, the cutout 222 expands, the aperture of the outlet cylinder 221 increases, and the thickness of the material increases.

[0075] Forming steps: the film is discharged on the discharge wheel 31, and the film pressing wheel 33 is heated by the induction coil. The film passes between the film pressing wheels 33. After the first convex part 34 and the first concave part 35 heat-press the film, the blowing device 42 located at the film moving-in position blows out cold air to cold-form the film and then winds it on the shaping wheel 4. The metal tube passes between the shaping wheels 4 to complete the shaping of the material. The blowing device 42 at the position between the shaping wheels 4 close to the film moving-out direction blows out hot air to act on the film, causing the film to shrink and wrinkle. The blowing device 42 at the film moving-out position blows out cold air, and the cold air cools and hardens the wrinkled film. Under the action of the cold air, the wrinkled film separates from the material, and the blowing device 42 blows up the film to separate it from the material, and the collecting wheel 32 recovers the film.

[0076] Cladding step: the illumination mechanism 5 illuminates the material to solidify the material. The illumination mechanism 5 disposed between the material storage mechanism 2 and the shaping wheel 4 illuminates the material to initially solidify the material, and the illumination mechanism 5 disposed between adjacent shaping wheels 4 illuminates the material to gradually solidify the material. The illumination mechanism 5 disposed between the shaping wheel 4 and the laser device 6 illuminates the material to completely solidify the material.

[0077] The illumination mechanism 5 is disposed at intervals between the material storage mechanism 2, the shaping wheel 4 and the laser device 6. The material does not solidify quickly but solidifies slowly before and after the shaping wheel 4 is rolled, thereby ensuring smooth detachment of the film.

[0078] The laser device 6 acts on the material with a certain power. The laser emitted by the laser device 6 melts the material on the metal tube under the action of the protective gas. Exemplarily, the protective gas is an inert gas.

[0079] After the metal tube cladding is completed, a group of metal tube upper tie rods and a group of metal tubes are removed, the moving device 8 moves to reset, and the clamping claws 85 clamp the next group of metal tube upper tie rods again.

[0080] The materials include: a binder, a first metal powder and a second metal powder. The first metal powder: the second metal powder = 7:3. The binder is 10-15 parts, and the first metal powder + the second metal powder is 20-105 parts. The first metal powder and the second metal powder are mixed first, and then the binder is added and mixed.

[0081] The melting temperature of the first metal powder is less than the temperature at which the laser device 6 acts on the material. The melting temperature of the second metal powder is greater than the temperature at which the laser device 6 acts on the material.

[0082] The melting temperature of the second metal powder is greater than the melting temperature of the first metal powder, so that when the first metal powder melts, the second metal powder does not melt. After the first metal powder melts, it fills between the second metal powders and adheres to the second metal powders, forming porous channels on the porous heat transfer coating. Since the second metal powder does not melt, the first metal powder melts and adheres to the second metal powder or fills between the second metal powders, and the porous heat transfer coating is easy to form porous channels, which increases the number of channels.

[0083] The diameter of the second metal powder is greater than that of the first metal powder. The larger diameter of the second metal powder makes the outer circumference of the second metal powder longer, and the length of the channel formed by the first metal powder attached to the second metal powder after melting is also longer.

[0084] The first metal powder includes a plurality of metal particles of different diameters. After melting, the metal particles of different diameters adhere to different positions of the second metal powder in different amounts, so that the surface of the channel finally formed forms a concave-convex structure. The metal particles with larger diameters form a convex structure on the inner surface of the channel, and the metal particles with smaller diameters form a concave structure on the inner surface of the channel.

[0085] Hot medium flows in the metal tube, and cold medium flows outside the metal tube. Cold medium flows into the channel. As the number of channels increases, more cold medium flows into the channel, which improves the heat exchange efficiency. The heat of the hot medium is transferred to the cold medium in the channel, and bubbles are generated in the cold medium in the channel. After the bubble diameter gradually increases, it flows along the channel and is discharged. Since the length of the channel is long and the inner surface of the channel is uneven, the surface of the inner surface of the channel is increased, and the number of bubbles generated is increased. Due to the long length of the channel, the flow time of the bubbles in the channel is increased, and the heat absorbed by the bubbles is increased, which improves the heat exchange efficiency. In addition, the inner surface of the channel is uneven, and the bubbles cannot flow smoothly along the channel, which further increases the flow time of the bubbles in the channel. The heat absorbed by the bubbles increases again, which further improves the heat exchange efficiency.

[0086] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A device for preparing a porous heat transfer coating on the surface of a metal tube, characterized in that: include: Guide rail (1); A material storage mechanism (2), the metal tube passing through the material discharge port of the material storage mechanism (2); Laminating mechanism (3); A shaping wheel (4) contacts the film and squeezes the material; An irradiation mechanism (5) for irradiating the material; A laser device (6) is used to melt the material onto the surface of the metal tube; A clamping rod (7) penetrates through and supports the metal pipe outwardly; A moving device (8) pulls the clamping rod (7) to move; The moving device (8) is movably arranged on the guide rail (1); the coating mechanism (3) winds the film around the shaping wheel (4); the material storage mechanism (2), the shaping wheel (4) and the laser device (6) are arranged in sequence on the guide rail (1) along the moving direction of the metal tube; and the illumination mechanism (5) is arranged at intervals between the material storage mechanism (2), the shaping wheel (4) and the laser device (6).

2. The device for preparing a porous heat transfer coating on the surface of a metal tube according to claim 1, characterized in that: The material storage mechanism (2) comprises: a material storage cylinder (21), a covering cylinder (22) connected to the material storage cylinder (21), and a scraper (23) arranged around a metal tube; the metal tube passes through the covering cylinder (22); the scraper (23) is arranged at the outlet of the covering cylinder (22) and expands or contracts.

3. The device for preparing a porous heat transfer coating on the surface of a metal tube according to claim 2, characterized in that: The laminating mechanism (3) comprises: a discharge wheel (31), a receiving wheel (32) and a film pressing wheel (33) arranged opposite to each other; a first convex portion (34) and a first concave portion (35) are formed on the film pressing wheel (33) opposite to each other; a second convex portion (36) is formed on the receiving wheel (32); two ends of the film are respectively wound around the discharge wheel (31) and the receiving wheel (32); the film passes through the film pressing wheel (33) opposite to each other and is then wound around the shaping wheel (4); the first convex portion (34) is embedded in the first concave portion (35) to heat-press the film into shape; and the second convex portion (36) pushes the film outward to the forming position to be tensioned.

4. The device for preparing a porous heat transfer coating on the surface of a metal tube according to claim 2, characterized in that: The device for preparing a porous heat transfer coating on the surface of a metal tube also includes: An adjustment bracket (41) and a blowing device (42) arranged on the adjustment bracket (41); the shaping wheel (4) is relatively movably arranged on the adjustment bracket (41); the metal tube passes through between the shaping wheels (4); the blowing end of the blowing device (42) faces the film on the shaping wheel (4) and is distributed along the moving direction of the film.

5. The device for preparing a porous heat transfer coating on the surface of a metal tube according to claim 2, characterized in that: The clamping rod (7) comprises: a main rod (71) penetrating the metal tube, a guide rod (72) slidably arranged on the main rod (71), and an outer support member (73) hinged on the guide rod (72); when the guide rod (72) moves along the main rod (71), the outer support member (73) supports the metal tube outward; when the guide rod (72) moves in the opposite direction along the main rod (71), the outer support member (73) is separated from the metal tube.

6. The device for preparing a porous heat transfer coating on the surface of a metal tube according to claim 2, characterized in that: The moving device (8) comprises a moving base plate (81), a roller (82) rotatably arranged on the moving base plate (81), a moving plate (83) movably arranged on the moving base plate (81), a screw rod (84) rotatably arranged on the moving base plate (81), and a clamping claw (85) arranged on the moving plate (83); wherein the roller (82) rolls along the guide rail (1); the moving plate (83) is threadedly connected to the screw rod (84); the screw rod (84) rotates to drive the moving plate (83) to move along the moving base plate (81), and the moving plate (83) drives the clamping claw (85) to pull the clamping rod (7).

7. A method for preparing a porous heat transfer coating on the surface of a metal tube, characterized in that: The steps include: Clamping steps: the clamping rod (7) penetrates and outwardly supports the metal pipe; the moving plate (83) moves to the clamping rod (7), and the clamping claw (85) pulls one end of the clamping rod (7); Moving step: the moving bottom plate (81) moves along the guide rail (1) at a certain speed, and drives the metal tube to approach the discharge port of the storage mechanism (2), the shaping wheel (4), the illumination mechanism (5) and the laser device (6) in sequence; Material coating step: materials are mixed in the material storage cylinder (21), the metal tube passes through the material coating cylinder (22), and the materials are coated on the outer surface of the metal tube; the scraper (23) expands or contracts to control the thickness of the material coating; Forming steps: the film passes between the film pressing wheels (33), and after the hot pressing film is formed, it is wound on the shaping wheel (4); the metal tube passes between the shaping wheels (4) to complete the shaping of the material; the blowing device (42) transfers heat to the film, and the film shrinks; The blowing device (42) blows up the film to separate it from the material, and the collecting wheel (32) recovers the film; Cladding step: the irradiation mechanism (5) irradiates the material to solidify the material; the laser device (6) acts on the material with a certain power.

8. The method for preparing a porous heat transfer coating on the surface of a metal tube according to claim 7, characterized in that: Materials include: Binder, first metal powder and second metal powder; first metal powder: second metal powder = 7:3; The binder is 10-15 parts; The first metal powder + the second metal powder is 20-105 parts.

9. The method for preparing a porous heat transfer coating on the surface of a metal tube according to claim 8, characterized in that: The melting temperature of the first metal powder is less than the temperature at which the laser device (6) acts on the material; the melting temperature of the second metal powder is greater than the temperature at which the laser device (6) acts on the material; the diameter of the second metal powder is greater than the diameter of the first metal powder; The first metal powder includes a plurality of metal particles with different diameters.

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