A heat exchanger, a mold for manufacturing the heat exchanger, and a manufacturing method thereof

Abstract

The present invention relates to the technical field of heat exchange devices, and particularly relates to a heat exchanger, a mold for preparing the heat exchanger, and a preparation method thereof. The 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. The heat exchanger is wrapped with a graphene part with a porous structure outside the heat exchange tube. Graphene has excellent heat dissipation performance, and 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 in weight, convenient for transportation, not easily corroded and blocked in harsh environments, convenient for cleaning, and has a long 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 typically transfer heat through fins. Existing heat exchange fins are mostly louvered fins and corrugated fins. These fins are bent to increase their surface area for efficient heat transfer. For example, Chinese invention patent application number 201110021034.5 discloses a fin for an air conditioner heat exchanger. This fin comprises a corrugated fin portion and a louvered fin portion, which prevents frost and improves heat exchange performance.

[0003] Current fins are usually made of metal 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 corrosion resistance and easy clogging, 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 that 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 around the heat exchange tube, the graphene part including 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 and the axis of the second through hole are perpendicular to each other, 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 horizontal tube and a vertical tube arranged in the outer shell; the outer shell includes a cover and an upwardly open box body, 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 horizontal tube, and the cover is provided with a third through hole for the vertical 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 has a graphene part with a porous structure wrapped outside the heat exchange tubes. Graphene has excellent heat dissipation performance, and 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 in weight and convenient for transportation, is not easily corroded and blocked in harsh environments, is convenient for cleaning, and has a long service life. Brief Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the heat exchanger in the specific embodiment of the present invention;

[0010] Figure 2 It is a cross-sectional view of the heat exchanger in the specific embodiment of the present invention;

[0011] Figure 3 It is a structural diagram of the mold in the fourth embodiment of the present invention;

[0012] Reference Signs Explanation:

[0013] 1. Heat exchange tube;

[0014] 2. Graphene part; 21. First through hole; 22. Second through hole;

[0015] 3. Outer shell; 31. Cover; 311. Third through hole; 32. Box body; 321. Fourth through hole; 322. Fifth through hole;

[0016] 4. Horizontal tube;

[0017] 5. Vertical tube. Specific Embodiment

[0018] To describe the technical content, achieved objectives and effects of the present invention in detail, the following is described in conjunction with the embodiments and with reference to the drawings.

[0019] Please refer to Figure 1 and Figure 2 , a heat exchanger, comprising 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 provided 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.

[0020] As can be seen from the above description, the beneficial effects of the present invention are as follows: The heat exchanger of the present invention is wrapped outside the heat exchange tubes with a graphene part including a first through hole and a second through hole provided on both sides of the heat exchange tubes. The graphene material itself has excellent heat dissipation performance. The first through hole and the second through hole provided on both sides of the heat exchange tubes are arranged alternately, which can effectively increase the heat exchange area and improve the heat exchange efficiency. Compared with the conventional metal heat dissipation fins, the graphene part of the present invention is lighter in weight, convenient for transportation and installation, not easily corroded in harsh environments such as seaside, acid rain, high temperature and high humidity, and the through holes are less likely to be blocked than the fins, convenient for cleaning, and have a longer service life.

[0021] Further, the material of the heat exchange tubes is aluminum alloy or copper. The heat exchange tubes are preferably in a coil structure.

[0022] As can be seen from the above description, aluminum alloy has rust prevention, good corrosion resistance and good heat conduction effect.

[0023] Further, the outer surface of the heat exchange tubes located within the graphene part is completely wrapped by the graphene part.

[0024] Further, a graphene layer is provided on the inner surface of the heat exchange tubes.

[0025] As can be seen from the above description, plating a layer of graphene inside the heat exchange tubes can achieve an anti-corrosion effect.

[0026] Further, the thickness of the graphene layer is 8 - 12 μm.

[0027] Further, the distance between the first through hole and the second through hole and the heat exchange tubes is at least 1 mm.

[0028] Further, the distance between the first through hole and the second through hole and the heat exchange tubes is at least 2 - 3 mm.

[0029] Further, the distance between adjacent two second through holes is at least 5 mm.

[0030] As can be seen from the above description, if the wall thickness is too thin, the stability of the graphene part is poor and it is easily broken.

[0031] Further, the diameter of the first through hole is 10 - 15 mm, and the diameter of the second through hole is 6 - 11 mm.

[0032] As can be seen from the above description, 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, it is not easy to ventilate, the heat transfer rate is low, and it is difficult to clean.

[0033] Please refer to Figure 3Another technical solution adopted by the present invention is: a mold for preparing the above-mentioned heat exchanger includes an outer shell and a horizontal tube and a vertical 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 horizontal tube, and the cover is provided with a third through hole for the vertical tube to pass through.

[0034] 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.

[0035] 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.

[0036] It can be seen from the above description that the fourth through hole is used to define the position of the heat exchange tube.

[0037] Furthermore, a fifth through hole for the transverse tube to pass through is provided on the surface opposite to the detachable side surface.

[0038] 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 applicable range of the mold.

[0039] Furthermore, the transverse tube and the longitudinal tube are solid structures, and the longitudinal tube is arranged through the transverse tube.

[0040] Furthermore, the diameter of the transverse tube is 10-15 mm, and the diameter of the longitudinal tube is 6-11 mm.

[0041] Preferably, the distance between the transverse tube and the longitudinal tube and the heat exchange tube is at least 1 mm.

[0042] Furthermore, the distance between the transverse tube and the heat exchange tube is at least 2-3 mm.

[0043] Furthermore, the distance between the longitudinal tubes is at least 5 mm.

[0044] 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.

[0045] As can be seen from the above description, the heat exchanger obtained by sintering in the present invention is simple, quick, and suitable for industrial production. Filling the heat exchange tubes with a filler before sintering prevents deformation during the pressing and sintering process. After sintering, the tubes are cooled naturally, and the slower cooling rate produces a smoother surface.

[0046] Further, the filler is metal powder with a melting point greater than 500 °C.

[0047] Further, the metal powder can withstand high temperatures of 500 - 600 °C.

[0048] Further, the volume ratio of graphene powder to binder powder is 2.5 - 3.5:1.

[0049] Further, the sintering temperature is 200 - 300 °C, and the sintering pressure is 10 - 20 MPa.

[0050] Please refer to Figure 1 and Figure 2 For Embodiment 1 of the present invention: A heat exchanger includes a heat exchange tube 1 and a graphene part 2 wrapped outside the heat exchange tube 1. The outer surface of the heat exchange tube 1 located inside the graphene part 2 is completely wrapped by the graphene part 2; the material of the heat exchange tube 1 is 3003 - type 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 part 2 includes a first through - hole 21 with a diameter of 13 mm and a second through - hole 22 with a diameter of 8 mm. Both the first through - hole 21 and the second through - hole 22 are arranged on both sides of the heat exchange tube 1; the axis of the first through - hole 21 is perpendicular to the axis of the second through - hole 22, the second through - hole 22 passes 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 adjacent two second through - holes 22 is 5 mm.

[0051] For Embodiment 2 of the present invention:

[0052] The difference between Embodiment 2 and Embodiment 1 is only that: the material of the heat exchange tube 1 is 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 adjacent two second through - holes 22 is 5 mm.

[0053] For Embodiment 3 of the present invention:

[0054] The difference between Embodiment 3 and Embodiment 1 is only 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 adjacent two second through - holes 22 is 6 mm.

[0055] Please refer to Figure 3, Embodiment 4 of the present invention is: A mold for preparing the heat exchanger of Embodiment 1, including a housing 3 and a horizontal tube 4 and a vertical tube 5 arranged inside the housing 3; the housing 3 includes a cover 31 and a box body 32 with an upward opening, and the shape of the cover 31 matches the shape of the opening of the box body 32; one side of the box body 32 is detachable and connected to one end of the horizontal tube 4, and the cover 31 is provided with a third through hole 311 for the vertical tube 5 to pass through; the detachable side is provided with a fourth through hole 321 for the liquid inlet end and the liquid outlet end of the heat exchange tube 1 to pass through, and the surface opposite to the detachable side is provided with a fifth through hole 322 for the horizontal tube 4 to pass through; the horizontal tube 4 and the vertical tube 5 are solid structures, and the vertical tube 5 is arranged through the horizontal tube 4; the diameter of the horizontal tube 4 is 13 mm, the diameter of the vertical tube 5 is 8 mm, the distance between the horizontal tube 4 and the vertical tube 5 and the heat exchange tube 1 is 3 mm, and the distance between the vertical tubes 5 is 5 mm.

[0056] Embodiment 5 of the present invention is: A method for preparing the heat exchanger of Embodiment 1 using the mold of Embodiment 4, and the steps are as follows:

[0057] S1: Fill the heat exchange tube 1 with a diameter of 19 mm with metal powder that can withstand a high temperature of 500 °C; mix graphene powder and binder powder in a volume ratio of 3:1 to obtain a mixed powder.

[0058] S2: Pass the liquid inlet end and the liquid outlet end of the filled heat exchange tube 1 through the fourth through hole 321 and fix them on the detachable side of the mold, and install this side on the box body 32; then insert the vertical tube 5 into the horizontal tube 4 so that the vertical tube 5 is arranged through the horizontal tube 4; add the mixed powder into the box body 32, pass the vertical tube 5 through the third through hole 311 to install the cover 31, and perform sintering by pressurizing the cover 31; the sintering temperature is 250 °C, and the sintering pressure is 18 MPa.

[0059] S3: After sintering, cool naturally, separate the cover 31, the vertical tube 5 and the horizontal tube 4 in sequence, remove from the mold and remove the filler to obtain the heat exchanger.

[0060] In summary, the heat exchanger, the mold for preparing the heat exchanger, and the preparation method provided by the present invention have the following advantages:

[0061] 1. A graphene part with a first through hole and a second through hole is wrapped outside the heat exchange tube, obtaining excellent heat dissipation performance and improving the heat exchange efficiency.

[0062] 2. Using corrosion-resistant graphene material and aluminum alloy material is beneficial for application in harsh environments.

[0063] 3. Compared with conventional finned heat exchangers, it is light in weight, easy to clean, not easy to corrode, and has a long service life.

[0064] 4. The heat exchanger is obtained through sintering, and the preparation method is simple and fast, suitable for industrial production.

[0065] 5. A specific mold is used during sintering. This mold has a simple structure and is convenient to operate.

[0066] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that: The heat exchange tube comprises a heat exchange tube and a graphene portion wrapped around the heat exchange tube, wherein the graphene portion comprises 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 and the axis of the second through hole being perpendicular to each other, and the second through hole being arranged through the first through hole; the outer surface of the heat exchange tube located in the graphene portion is completely wrapped by the graphene portion; the inner surface of the heat exchange tube is provided with a graphene layer; the diameter of the first through hole is 10-15 mm, and the diameter of the second through hole is 6-11 mm.

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

3. A mold for preparing the heat exchanger according to claim 1 or 2, characterized in that: The invention 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 side surface 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.

4. The mold for preparing a heat exchanger according to claim 3, characterized in that: The transverse tube and the longitudinal tube are solid structures, and the longitudinal tube is arranged through the transverse tube.

5. The mold for preparing a heat exchanger according to claim 3, characterized in that: The diameter of the transverse tube is 10-15 mm, and the diameter of the longitudinal tube is 6-11 mm.

6. The mold for preparing a heat exchanger according to claim 3, characterized in that: The distance between the transverse tube and the longitudinal tube and the heat exchange tube is at least 1 mm.

7. The mold for preparing a heat exchanger according to claim 3, characterized in that: The distance between the longitudinal tubes is at least 5 mm.

8. The method for preparing a heat exchanger according to claim 1 or 2, characterized in that: The following steps are involved: The heat exchange tube filled with filler 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 filler is removed to obtain a heat exchanger.

9. The method for preparing a heat exchanger according to claim 8, wherein: The sintering temperature is 200-300° C., and the sintering pressure is 10-20 MPa.

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