Heat exchanger, mold for preparing heat exchanger and preparation method

Abstract

The invention relates to the technical field of heat exchange devices, in particular to a heat exchanger and a mold and method for preparing the heat exchanger. The heat exchanger comprises a heat exchange tube and a graphene part wrapping the heat exchange tube, the graphene part comprises a first through hole and a second through hole which are formed in the two sides of the heat exchange tube, the axis of the first through hole is perpendicular to the axis of the second through hole, and the second through hole penetrates through the first through hole. According to the heat exchanger, the heat exchange pipe is wrapped with the graphene part of the porous structure, the graphene is excellent in heat dissipation performance, the heat exchange area can be effectively increased through the porous structure, and therefore the heat exchange efficiency of the whole device is improved. Compared with a conventional fin, the graphene part is lighter in weight, convenient to carry, not prone to corrosion and blocking in a severe environment, convenient to clean and long in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange devices, and in particular to a heat exchanger and a mold and a method for preparing the heat exchanger. Background Art

[0002] Heat exchange devices usually transfer heat through fins. Existing heat exchange fins are mostly louver fins and corrugated fins. The surface area of ​​the fins is increased by bending to achieve sufficient heat transfer. For example, Chinese invention patent application number 201110021034.5 discloses a fin for air conditioner heat exchanger, which includes a corrugated fin part and a louver fin part, which can prevent frost from forming and improve heat exchange performance.

[0003] Current fins are usually made of metals with good thermal conductivity, light weight and easy processing. They are attached to the heating surface for composite heat exchange. They have disadvantages such as being not corrosion-resistant and easy to clog, and are not suitable for use in harsh outdoor environments such as high temperature and high humidity. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a heat exchanger which can be used in harsh environments and a mold and a method for preparing the heat exchanger.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a heat exchanger, including a heat exchange tube and a graphene part wrapped outside the heat exchange tube, the graphene part includes a first through hole and a second through hole arranged on both sides of the heat exchange tube, the axis of the first through hole is perpendicular to the axis of the second through hole, and the second through hole is arranged through the first through hole.

[0006] Another technical solution adopted by the present invention is: a mold for preparing the above-mentioned heat exchanger includes an outer shell and a transverse tube and a longitudinal tube arranged in the outer shell; the outer shell includes a cover and a box body opening upward, and the shape of the cover is consistent with the shape of the opening of the box body; one of the side surfaces of the box body is detachable and connected to one end of the transverse tube, and the cover is provided with a third through hole for the longitudinal tube to pass through.

[0007] Another technical solution adopted by the present invention is: the preparation method of the above-mentioned heat exchanger includes the following steps: placing a heat exchange tube filled with filler in a mold, adding graphene powder and binder powder to the mold for sintering, naturally cooling after sintering, and then removing from the mold and removing the filler to obtain a heat exchanger.

[0008] The beneficial effects of the present invention are as follows: the heat exchanger of the present invention wraps a graphene part with a porous structure outside the heat exchange tube, and the graphene has excellent heat dissipation performance. Its porous structure can effectively increase the heat exchange area, thereby improving the heat exchange efficiency of the entire device. Compared with conventional fins, the graphene part of the present invention is lighter and more convenient to carry, is not easy to corrode or clog in harsh environments, is easy to clean, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a heat exchanger in a specific embodiment of the present invention; Figure 2 A cross-sectional view of a heat exchanger in a specific embodiment of the present invention; Figure 3 is a structural diagram of a mold in Embodiment 4 of the present invention; Description of labels: 1. Heat exchange tube; 2. graphene portion; 21. first through hole; 22. second through hole; 3. Shell; 31. Cover; 311. Third through hole; 32. Box body; 321. Fourth through hole; 322. Fifth through hole; 4. Horizontal pipe; 5. Vertical tube. DETAILED DESCRIPTION

[0010] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0011] Please refer to Figure 1 as well as Figure 2 A heat exchanger includes a heat exchange tube and a graphene part wrapped outside the heat exchange tube, the graphene part includes a first through hole and a second through hole arranged on both sides of the heat exchange tube, the axis of the first through hole is perpendicular to the axis of the second through hole, and the second through hole is arranged through the first through hole.

[0012] From the above description, it can be seen that the beneficial effect of the present invention is that the heat exchanger of the present invention is wrapped with a graphene part including a first through hole and a second through hole arranged on both sides of the heat exchange tube. The graphene material itself has excellent heat dissipation performance. It includes the first through hole and the second through hole arranged on both sides of the heat exchange tube, which are staggered, which can effectively increase the heat exchange area and improve the heat exchange efficiency. Compared with conventional metal heat dissipation fins, the graphene part of the present invention is lighter and more convenient to carry and install. It is not easy to corrode in harsh environments such as the seaside, acid rain, high temperature and high humidity, and the through holes are less likely to be blocked than fins, which is convenient to clean and has a longer service life.

[0013] Furthermore, the heat exchange tube is made of aluminum alloy or copper. The heat exchange tube is preferably a coil structure.

[0014] From the above description, it can be seen that aluminum alloy is rust-proof, has good corrosion resistance and good thermal conductivity.

[0015] Furthermore, the outer surface of the heat exchange tube located in the graphene portion is completely wrapped by the graphene portion.

[0016] Furthermore, a graphene layer is provided on the inner surface of the heat exchange tube.

[0017] From the above description, it can be seen that coating a layer of graphene inside the heat exchange tube can have an anti-corrosion effect.

[0018] Furthermore, the thickness of the graphene layer is 8-12 μm.

[0019] Furthermore, the distance between the first through hole, the second through hole and the heat exchange tube is at least 1 mm.

[0020] Furthermore, the distance between the first through hole, the second through hole and the heat exchange tube is at least 2-3 mm.

[0021] Furthermore, the distance between two adjacent second through holes is at least 5 mm.

[0022] From the above description, it can be seen that if the wall thickness is too thin, the stability of the graphene part is poor and it is easy to break.

[0023] Furthermore, the diameter of the first through hole is 10-15 mm, and the diameter of the second through hole is 6-11 mm.

[0024] From the above description, it can be seen that if the diameters of the first through hole and the second through hole are too large, the specific surface area is reduced and the heat transfer effect is reduced; if they are too small, ventilation is difficult, the heat transfer rate is low, and it is difficult to clean.

[0025] Please refer to Figure 3 Another technical solution adopted by the present invention is: a mold for preparing the above-mentioned heat exchanger includes an outer shell and a transverse tube and a longitudinal tube arranged in the outer shell; the outer shell includes a cover and a box body opening upward, and the shape of the cover is consistent with the shape of the opening of the box body; one of the side surfaces of the box body is detachable and connected to one end of the transverse tube, and the cover is provided with a third through hole for the longitudinal tube to pass through.

[0026] From the above description, it can be seen that when the mold is used, the heat exchange tube filled with filler is first placed in the box body, and then the horizontal tube is inserted between the heat exchange tubes by installing the side connected to the horizontal tube; then the longitudinal tube is inserted so that the longitudinal tube passes through the horizontal tube setting; then graphene powder and binder powder are added to the box body, the cover is installed, and the sintering pressure is adjusted by pressurizing the cover.

[0027] Furthermore, a fourth through hole for the liquid inlet and liquid outlet of the heat exchange tube to pass through is provided on the detachable side.

[0028] It can be seen from the above description that the fourth through hole is used to define the position of the heat exchange tube.

[0029] Furthermore, a fifth through hole for the transverse tube to pass through is provided on the surface arranged opposite to the detachable side surface.

[0030] From the above description, it can be seen that the fifth through hole is used to adjust the distance between the two surfaces, thereby adjusting the size of the heat exchanger and expanding the application range of the mold.

[0031] Furthermore, the transverse tube and the longitudinal tube are solid structures, and the longitudinal tube is arranged through the transverse tube.

[0032] Furthermore, the diameter of the transverse tube is 10-15 mm, and the diameter of the longitudinal tube is 6-11 mm.

[0033] Preferably, the distance between the transverse tube and the longitudinal tube and the heat exchange tube is at least 1 mm.

[0034] Furthermore, the distance between the transverse tube and the heat exchange tube is at least 2-3 mm.

[0035] Furthermore, the distance between the longitudinal tubes is at least 5 mm.

[0036] Another technical solution adopted by the present invention is: the preparation method of the above-mentioned heat exchanger includes the following steps: placing a heat exchange tube filled with filler in a mold, adding graphene powder and binder powder to the mold for sintering, naturally cooling after sintering, and then removing from the mold and removing the filler to obtain a heat exchanger.

[0037] From the above description, it can be seen that the heat exchanger is obtained by sintering in the present invention, and the preparation method is simple and fast, and is suitable for industrial production. Before sintering, the heat exchange tube is filled with fillers to avoid deformation of the heat exchange tube during the pressing and sintering process; after sintering, it is naturally cooled, and the slower cooling rate can obtain a smoother surface.

[0038] Furthermore, the filler is metal powder with a melting point greater than 500°C.

[0039] Furthermore, the metal powder can withstand high temperatures of 500-600°C.

[0040] Furthermore, the volume ratio of graphene powder to binder powder is 2.5~3.5:1.

[0041] Furthermore, the sintering temperature is 200-300° C., and the sintering pressure is 10-20 MPa.

[0042] Please refer to Figure 1 and Figure 2Embodiment 1 of the present invention is: a heat exchanger, comprising a heat exchange tube 1 and a graphene portion 2 wrapped outside the heat exchange tube 1, the outer surface of the heat exchange tube 1 located in the graphene portion 2 is completely wrapped by the graphene portion 2; the material of the heat exchange tube 1 is 3003 aluminum alloy, the inner surface of the heat exchange tube 1 is provided with a graphene layer with a thickness of 10 μm, and the diameter of the heat exchange tube 1 is 19 mm; the graphene portion 2 comprises a first through hole 21 with a diameter of 13 mm and a second through hole 22 with a diameter of 8 mm, the first through hole 21 and the second through hole 22 are both arranged on both sides of the heat exchange tube 1; the axis of the first through hole 21 and the axis of the second through hole 22 are perpendicular to each other, the second through hole 22 is arranged through the first through hole 21, the distance between the first through hole 21 and the second through hole 22 and the heat exchange tube 1 is 3 mm, and the distance between two adjacent second through holes 22 is 5 mm.

[0043] Embodiment 2 of the present invention is: The only difference between Example 2 and Example 1 is that the heat exchange tube 1 is made of copper, the thickness of the graphene layer is 8 μm, the diameter of the first through hole 21 is 10 mm, the diameter of the second through hole 22 is 6 mm, the distance between the first through hole 21 and the second through hole 22 and the heat exchange tube 1 is 2 mm, and the distance between two adjacent second through holes 22 is 5 mm.

[0044] Embodiment 3 of the present invention is: The only difference between the third embodiment and the first embodiment is that the thickness of the graphene layer is 12 μm, the diameter of the first through hole 21 is 15 mm, the diameter of the second through hole 22 is 11 mm, the distance between the first through hole 21 and the second through hole 22 and the heat exchange tube 1 is 1 mm, and the distance between two adjacent second through holes 22 is 6 mm.

[0045] Please refer to Figure 3 , the fourth embodiment of the present invention is: a mold for preparing the heat exchanger of the first embodiment, comprising an outer shell 3 and a transverse tube 4 and a longitudinal tube 5 arranged in the outer shell 3; the outer shell 3 comprises a cover 31 and a box body 32 opened upward, the shape of the cover 31 is consistent with the shape of the opening of the box body 32; one of the side surfaces of the box body 32 is detachable and connected to one end of the transverse tube 4, and the cover 31 is provided with a third through hole 311 for the longitudinal tube 5 to pass through; a fourth through hole 321 for the liquid inlet and liquid outlet of the heat exchange tube 1 to pass through is provided on the detachable side surface, and a fifth through hole 322 for the transverse tube 4 to pass through is provided on the surface arranged opposite to the detachable side surface; the transverse tube 4 and the longitudinal tube 5 are solid structures, and the longitudinal tube 5 is arranged through the transverse tube 4; the diameter of the transverse tube 4 is 13 mm, the diameter of the longitudinal tube 5 is 8 mm, the distance between the transverse tube 4 and the longitudinal tube 5 and the heat exchange tube 1 is 3 mm, and the distance between the longitudinal tubes 5 and the longitudinal tubes 5 is 5 mm.

[0046] Embodiment 5 of the present invention is a method for preparing the heat exchanger in Embodiment 1 by using the mold in Embodiment 4, and the steps are as follows: S1: Filling a heat exchange tube 1 having a diameter of 19 mm with metal powder that can withstand a high temperature of 500° C.; mixing graphene powder and binder powder in a volume ratio of 3:1 to obtain a mixed powder.

[0047] S2: The liquid inlet and outlet ends of the filled heat exchange tube 1 are fixed on the detachable side of the mold through the fourth through hole 321, and the side is installed on the box body 32; then the longitudinal tube 5 is inserted into the transverse tube 4, and the longitudinal tube 5 is set through the transverse tube 4; the mixed powder is added to the box body 32, and the longitudinal tube 5 is passed through the third through hole 311 to install the cover 31, and the cover 31 is pressurized for sintering; the sintering temperature is 250°C, and the sintering pressure is 18 MPa.

[0048] S3: After sintering, the heat exchanger is naturally cooled, and the cover 31, the longitudinal tube 5 and the transverse tube 4 are separated in sequence, separated from the mold and the filler is removed to obtain the heat exchanger.

[0049] In summary, the heat exchanger and the mold and method for preparing the heat exchanger provided by the present invention have the following advantages: 1. A graphene portion having a first through hole and a second through hole is wrapped outside the heat exchange tube to obtain excellent heat dissipation performance and improve heat exchange efficiency.

[0050] 2. The use of corrosion-resistant graphene materials and aluminum alloy materials is conducive to application in harsh environments.

[0051] 3. Compared with conventional fin heat exchangers, it is light, easy to clean, not easy to corrode, and has a long service life.

[0052] 4. The heat exchanger is obtained by sintering. The preparation method is simple and fast and suitable for industrial production.

[0053] 5. A specific mold is used during sintering, which has a simple structure and is easy to operate.

[0054] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that: It includes a heat exchange tube and a graphene part wrapped outside the heat exchange tube, the graphene part includes a first through hole and a second through hole arranged on both sides of the heat exchange tube, the axis of the first through hole is perpendicular to the axis of the second through hole, and the second through hole is arranged through the first through hole.

2. The heat exchanger according to claim 1, characterized in that: The heat exchange tube is made of aluminum alloy or copper.

3. The heat exchanger according to claim 1, characterized in that: The outer surface of the heat exchange tube located in the graphene portion is completely wrapped by the graphene portion.

4. A mold for preparing a heat exchanger according to any one of claims 1 to 3, characterized in that: It comprises an outer shell and a transverse tube and a longitudinal tube arranged in the outer shell; the outer shell comprises a cover and a box body opening upward, the shape of the cover matches the shape of the opening of the box body; one of the side surfaces of the box body is detachable and connected to one end of the transverse tube, and the cover is provided with a third through hole for the longitudinal tube to pass through.

5. The mold according to claim 4, characterized in that: The transverse tube and the longitudinal tube are solid structures, and the longitudinal tube is arranged through the transverse tube.

6. The mold according to claim 4, characterized in that: The diameter of the transverse tube is 10-15 mm, and the diameter of the longitudinal tube is 6-11 mm.

7. The mold according to claim 4, characterized in that: The distance between the transverse tube and the longitudinal tube and the heat exchange tube is at least 1 mm.

8. The mold according to claim 4, characterized in that: The distance between the longitudinal tubes is at least 5 mm.

9. The method for preparing a heat exchanger according to any one of claims 1 to 3, characterized in that: The following steps are involved: The heat exchange tube filled with fillers is placed in a mold, and graphene powder and binder powder are added to the mold for sintering. After sintering, the tube is naturally cooled, and then removed from the mold and the fillers are removed to obtain a heat exchanger.

10. The method for preparing a heat exchanger according to claim 9, characterized in that: The sintering temperature is 200-300° C., and the sintering pressure is 10-20 MPa.

Images