Evaporator

Abstract

The embodiment of the utility model provides an evaporator and an evaporator, the evaporator is divided into a first evaporation unit and a second evaporation unit, and the first evaporation unit and the second evaporation unit are not coplanar; wherein the first evaporation unit comprises a first bent pipe, a first fin and a first straight pipe group, the first bent pipe is connected with any two adjacent straight pipes in the first straight pipe group, and the first fin is arranged on the outer surface of the first straight pipe group; the second evaporation unit comprises a second bent pipe, a second fin and a second straight pipe group, the second bent pipe is connected with any two adjacent straight pipes in the second straight pipe group, and the second fin is arranged on the outer surface of the second straight pipe group; the first straight pipe groups and the second straight pipe groups are in one-to-one correspondence and are communicated, and the first straight pipe groups and the second straight pipe groups are not parallel; functional layers are arranged on the outer surfaces of the first fins and the second fins and comprise graphene. The evaporator is prevented from scaling, and the operation efficiency of the heat exchanger is improved.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of heat exchange, and in particular to an evaporator. Background Art

[0002] In winter, the air conditioning heat pump unit has a frost problem during operation. That is, a layer of frost forms on the surface of the air conditioning outdoor unit evaporator at low temperature due to humid air. As the frost layer thickens, the ventilation area decreases, the heat exchange area is reduced, and the heat transfer resistance of the evaporator surface is increased, resulting in reduced winter operating efficiency of the heat pump unit. In severe cases, the unit cannot operate. Therefore, the heat pump unit needs to be defrosted regularly during winter operation. The defrosting and frosting process can cause the unit to have reduced operating efficiency or even fail to operate, reducing equipment reliability and increasing equipment operating costs. Utility Model Content

[0003] The embodiment of the utility model provides an evaporator to prevent scaling of the evaporator so as to improve the operating efficiency of the heat exchanger.

[0004] The evaporator and the preparation of the evaporator provided by the embodiment of the utility model include:

[0005] In a first aspect, an embodiment of the present utility model provides an evaporator, which is divided into a first evaporation unit and a second evaporation unit, wherein the first evaporation unit and the second evaporation unit are not coplanar;

[0006] Wherein, the first evaporation unit comprises a first elbow, a first fin and a first straight tube group, the first elbow connects any two adjacent straight tubes in the first straight tube group, and the first fin is arranged on the outer surface of the first straight tube group;

[0007] The second evaporation unit comprises a second elbow, a second fin and a second straight tube group, the second elbow connects any two adjacent straight tubes in the second straight tube group, and the second fin is arranged on the outer surface of the second straight tube group;

[0008] The first straight tube group and the second straight tube group correspond to each other one by one and are connected, and the first straight tube group and the second straight tube group are not parallel; the outer surfaces of the first fin and the second fin are both provided with a functional layer, and the functional layer includes graphene.

[0009] The evaporator here includes a first evaporation unit and a second evaporation unit that are not coplanar. The evaporator is bent into two non-coplanar parts, thereby increasing the overall heat exchange area of ​​the evaporator without increasing the volume of the evaporator; that is, by bending the first evaporation unit and the second evaporation unit of the evaporator, the evaporator can have a larger heat transfer surface area in a limited space, thereby reducing the overall volume; and the bending design of the first straight tube group and the second straight tube group can reduce the resistance of the fluid flowing from the first straight tube group to the second straight tube group, reduce the pressure drop, and reduce energy consumption; of course, in order to further improve the heat dissipation effect of the heat exchanger, the first straight tube in the first evaporation unit The first fin is arranged on the group, and the second fin is also arranged on the second straight tube group in the second evaporation unit, and the functional layer is sprayed on the outer surface of the first fin and the second fin. The functional layer includes graphene, and the functional layer provides hydrophobic properties. Due to its small surface energy, it is difficult for water vapor to undergo a phase transformation and nucleation on the surface of the fin coated with the functional layer, so that the purpose of no frost or less frost on the surface of the treated evaporator can be achieved. The functional layer can also prevent scaling to extend the service life of the evaporator. The characteristics of the graphene material with large thermal conductivity and large specific surface area can be used to improve the heat exchange performance of the evaporator and improve the heat exchange efficiency to achieve the purpose of energy saving and emission reduction. Therefore, it is only necessary to spray the functional layer on the outer surface of the first fin and the second fin to prevent scaling and avoid tedious operations such as adding scale inhibitors, thereby making the operation simpler and effectively reducing costs.

[0010] Optionally, an evaporation area of ​​the first evaporation unit is larger than an evaporation area of ​​the second evaporation unit.

[0011] Optionally, when there are multiple first fins, the first fins are arranged along the length direction of the straight tubes in the first straight tube group, and at least two of the multiple first fins are parallel; when there are multiple second fins, the second fins are arranged along the length direction of the straight tubes in the second straight tube group, and at least two of the multiple second fins are parallel; at least one first fin among the multiple first fins is parallel to at least one second fin among the multiple second fins.

[0012] Optionally, the plurality of straight tubes in the first straight tube group all penetrate each of the first fins; and the plurality of straight tubes in the first straight tube group all penetrate each of the second fins.

[0013] Optionally, the first straight tube group includes a first tube fitting and a second tube fitting arranged adjacent to each other, and the projections of the first tube fitting and the second tube fitting in the Z direction do not overlap; the first straight tube group also includes a third tube fitting, and the projections of the third tube fitting and the second tube fitting in the Z direction do not overlap, and the projections of the third tube fitting and the first tube fitting in the Z direction overlap.

[0014] Optionally, the second straight tube group includes a fourth tube fitting and a fifth tube fitting arranged adjacent to each other, and the projections of the fourth tube fitting and the fifth tube fitting in the Z direction do not overlap; the second straight tube group also includes a sixth tube fitting, and the projections of the sixth tube fitting and the fifth tube fitting in the Z direction do not overlap, and the projections of the sixth tube fitting and the fourth tube fitting in the Z direction overlap.

[0015] Optionally, the first pipe fitting and the fourth pipe fitting are connected via a connecting pipe; the second pipe fitting and the fifth pipe fitting are connected via a connecting pipe; and the third pipe fitting and the sixth pipe fitting are connected via a connecting pipe.

[0016] Optionally, it further includes a first support plate and a second support plate; the first support plate is arranged on the outside of the plurality of first fins; the second support plate is arranged on the outside of the plurality of second fins.

[0017] Optionally, the thickness of the functional layer is 1 μm-9 μm.

[0018] In a second aspect, an embodiment of the present invention provides a method for preparing an evaporator, comprising:

[0019] The graphene coating and the diluent are mixed in a ratio of a:1 to form a mixed solution, wherein the value of a ranges from 9 to 11;

[0020] Spraying the mixed liquid on the outer surface of the fins in the evaporator at room temperature, wherein the evaporator is divided into a first evaporation unit and a second evaporation unit, and the first evaporation unit and the second evaporation unit are not coplanar;

[0021] The evaporator after spraying is solidified so that the mixed liquid on the fin forms a functional layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a three-dimensional structure of an evaporator provided in an embodiment of the utility model Figure 1 ;

[0024] Figure 2 A schematic diagram of a three-dimensional structure of an evaporator provided in an embodiment of the utility model Figure 2 ;

[0025] Figure 3A schematic diagram of an evaporator provided in an embodiment of the utility model Figure 1 ;

[0026] Figure 4 A side view of an evaporator provided by an embodiment of the utility model Figure 2 ;

[0027] Figure 5 A side view of an evaporator provided by an embodiment of the utility model Figure 3 ;

[0028] Figure 6 A cross-sectional view of a fin provided in an embodiment of the utility model.

[0029] Figure 7 A schematic diagram of the three-dimensional structure of a tube in an evaporator provided in an embodiment of the utility model;

[0030] Figure 8 A schematic diagram of a planar structure of a tube in an evaporator provided in an embodiment of the utility model Figure 1 ;

[0031] Fig. 9 A schematic diagram of a planar structure of a tube in an evaporator provided in an embodiment of the utility model Figure 2 ;

[0032] Fig.10 A schematic diagram of the structure of a fin in an evaporator provided in an embodiment of the utility model;

[0033] Figure numerals: 10-first evaporation unit; 11-first elbow; 12-first fin; 121-body; 122-hole; 13-first straight tube group; 131-first pipe fitting; 132-second pipe fitting; 133-third pipe fitting; 20-second evaporation unit; 21-second elbow; 22-second fin; 23-second straight tube group; 231-fourth pipe fitting; 232-fifth pipe fitting; 233-sixth pipe fitting; 234-inlet; 235-outlet; 30-functional layer; 40-first support plate; 50-second support plate; 60-connecting pipe; 61-third fin. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] When the existing evaporator has a frost problem during winter operation, the conventional defrosting method is reverse cycle defrosting, that is, the four-way valve changes the flow direction of the refrigerant, allowing the unit to switch from a heating operation state to a cooling operation state, and the high-temperature gas discharged from the compressor is switched to the outdoor heat exchanger through the four-way valve for defrosting. This method has great limitations and comes at the cost of a large amount of energy consumption, which is not in line with the original intention of energy conservation and emission reduction of the equipment.

[0036] In order to solve the above problems, new materials are used to treat the surface of the evaporator to prevent frost and condensation. Figure 1-Figure 6 In a first aspect, an evaporator provided by an embodiment of the utility model is divided into a first evaporation unit 10 and a second evaporation unit 20, and the first evaporation unit 10 and the second evaporation unit 20 are not coplanar;

[0037] The first evaporation unit 10 includes a first elbow 11, a first fin 12 and a first straight tube group 13, wherein the first elbow 11 connects any two adjacent straight tubes in the first straight tube group 13, and the first fin 12 is arranged on the outer surface of the first straight tube group 13; the second evaporation unit 20 includes a second elbow 21, a second fin 22 and a second straight tube group 23, wherein the second elbow 21 connects any two adjacent straight tubes in the second straight tube group 23, and the second fin 22 is arranged on the outer surface of the second straight tube group 23; the first straight tube group 13 and the second straight tube group 23 correspond to each other and are connected, and the first straight tube group 13 and the second straight tube group 23 are not parallel; the outer surfaces of the first fin 12 and the second fin 22 are both provided with a functional layer 30, and the functional layer 30 includes graphene. Graphene has excellent thermal conductivity and hydrophobicity. The utility model changes the surface characteristics of the evaporator fins. The functional layer 30 includes graphene and epoxy resin, that is, an epoxy resin graphene electric heating coating evaporator is prepared. The frost suppression performance of the graphene super-hydrophobic coating is combined with the characteristic of uniform surface heating of the epoxy resin to achieve the purpose of energy saving and emission reduction.

[0038] The evaporator here includes a first evaporation unit 10 and a second evaporation unit 20 that are not coplanar. The evaporator is bent into two non-coplanar parts, which increases the overall heat exchange area of ​​the evaporator without increasing the volume of the evaporator; that is, by bending the first evaporation unit 10 and the second evaporation unit 20 of the evaporator, the evaporator can have a larger heat transfer surface area in a limited space, thereby reducing the overall volume; and the bending design of the first straight tube group 13 and the second straight tube group 23 can reduce the resistance of the fluid flowing from the first straight tube group 13 to the second straight tube group 23, reduce the pressure drop, and reduce energy consumption; of course, in order to further improve the heat dissipation effect of the heat exchanger, the first straight tube group 13 in the first evaporation unit 10 is A first fin 12 is arranged on the top, and a second fin 22 is arranged on the second straight tube group 23 in the second evaporation unit 20, and a functional layer 30 is sprayed on the outer surface of the first fin 12 and the second fin 22. The functional layer 30 includes graphene, and the functional layer 30 provides hydrophobicity. Due to its small surface energy, it is difficult for water vapor to undergo phase transformation and nucleation on the surface of the fin coated with the functional layer 30, so that the purpose of no frost or less frost on the surface of the treated evaporator can be achieved. The functional layer 30 can also prevent scaling to extend the service life of the evaporator. The graphene material has the characteristics of large thermal conductivity and large specific surface area, which can improve the heat exchange performance of the evaporator and improve the heat exchange efficiency to achieve the purpose of energy saving and emission reduction. Therefore, it is only necessary to spray the functional layer 30 on the outer surface of the first fin 12 and the second fin 22 to prevent scaling, avoid cumbersome operations such as adding antiscaling agents, and thus the operation is simpler and the cost is effectively reduced.

[0039] In some specific embodiments, the evaporation area of ​​the first evaporation unit 10 is larger than the evaporation area of ​​the second evaporation unit 20, that is, the first evaporation unit 10 is used as the main evaporation structure. This is because in actual applications, since the first evaporation unit 10 is farther away from the heat source, in order to avoid excessive heat loss while ensuring the evaporation effect, the first evaporation unit 10 that requires a larger evaporation area is set away from the inlet 234 and the outlet 235; while the second evaporation unit 20 is relatively close to the heat source, and its evaporation area can be relatively small, so as to avoid excessive heat loss of the heat exchange fluid entering from the inlet 234 when passing through the second evaporation unit 20. Such a design makes the overall structure of the evaporator more reasonable and improves the heat exchange efficiency.

[0040] Specifically, when there are multiple first fins 12, the first fins 12 are arranged along the length direction of the straight tubes in the first straight tube group 13, and at least two of the multiple first fins 12 are parallel; when there are multiple second fins 22, the second fins 22 are arranged along the length direction of the straight tubes in the second straight tube group 23, and at least two of the multiple second fins 22 are parallel; at least one of the multiple first fins 12 is parallel to at least one of the multiple second fins 22. Of course, the multiple first fins 12 can also be parallel, and the multiple second fins 22 can also be parallel. In other words, the first fins 12 and the second fins 22 show a certain arrangement pattern on their respective straight tube groups. Such a design helps to ensure the heat exchange efficiency between the fins and the straight tube groups, and is not prone to problems such as excessive heat in a certain area. That is, the regular arrangement of the fins helps to ensure the evaporation efficiency of the evaporator provided in the embodiment of the utility model, and also facilitates the spraying operation of the functional layer 30.

[0041] In addition, in order to make the evaporator more adaptable to various application scenarios, the evaporator of the utility model can also be designed in a variety of deformations. For example, the shapes of the first evaporation unit 10 and the second evaporation unit 20 can be different to meet different spatial layout requirements. The evaporator of the utility model achieves multiple advantages such as preventing frost, improving heat exchange efficiency, and reducing energy consumption by adopting a graphene functional layer 30, a reasonable structural design and layout, and has broad application prospects and market value. At the same time, the evaporator of the utility model can also be adapted to different application scenarios through a variety of deformation designs, making it more practical and flexible.

[0042] In some specific embodiments, the plurality of straight tubes in the first straight tube group 13 penetrate each first fin 12; the plurality of straight tubes in the first straight tube group 13 penetrate each second fin 22. The spacing between two adjacent first fins 12 ranges from 1mm to 3mm, for example, the spacing between two adjacent first fins 12 can be 1mm, 2mm or 3mm, wherein the spacing between any two adjacent first fins 12 can be the same or different; the spacing between two adjacent second fins 22 ranges from 1mm to 3mm, for example, the spacing between two adjacent second fins 22 can be 1mm, 2mm or 3mm, wherein the spacing between any two adjacent first fins 12 can be the same or different. Of course, the distance between two adjacent first fins 12 can be equal to or different from the distance between two adjacent second fins 22. When the spacing between two adjacent first fins 12 decreases, the thickness of the functional layer 30 decreases accordingly to ensure the balance between the heat exchange efficiency and the anti-corrosion performance of the heat exchanger. The spacing between the first fins is d1, and the thickness of the functional layer is d2, preferably d1:d2 is 200:1.

[0043] According to the evaporation capacity of the evaporator provided in the embodiment of the utility model, the spacing of the first fins 12 and the spacing of the second fins 22 are optimized, so that the defrosting speed of the evaporator is accelerated and the heat exchange efficiency is significantly improved. In addition, the super-hydrophobic properties and excellent mechanical properties of the graphene layer on the outer surfaces of the first fins 12 and the second fins 22 are combined to effectively prevent scaling and extend the service life of the heat exchanger.

[0044] like Figure 6 As shown, a functional layer 30 is provided on the outer surface of the first fin 12 and the second fin 22. The functional layer 30 can also be provided on the outer surface of the first elbow 11, the first straight tube group 13, the second elbow 21 and the second straight tube group 23. The thickness of the functional layer 30 is 1 μm-9 μm. For example, the thickness of the functional layer 30 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm or 9 μm. Of course, the functional layer 30 includes graphene and epoxy resin. Graphene has excellent electrical and thermodynamic properties. It is not only an ideal thermal conductive material, but also the material with the best electrical conductivity at room temperature. Therefore, graphene is considered to be an ideal filler for improving the electrical and thermal conductivity of resin-based composite materials. The typical feature of epoxy resin is strong adhesion. This is because the epoxy molecular structure has a large active oxygen-containing group, which is very active and easy to react with other groups. It has strong adhesion and can improve the shear strength of the material. Secondly, epoxy resin has strong stability and corrosion resistance, and epoxy resin is soluble in most organic solvents when it is not cured. More importantly, after curing, the molecular distance in the epoxy resin system will be closer, and a stable three-dimensional network structure can be formed, which can be mixed with other materials in any proportion, which creates good processing properties of epoxy resin. Since graphene is a lightweight material, it can help reduce the volume and weight of the heat exchanger; the functional layer 30 uses graphene and epoxy resin materials to mix, and sprays it on the outer surface of the heat exchanger. The heat exchanger can have higher heat exchange efficiency, better durability and safety, while reducing the volume and weight, which is beneficial to improving the overall performance and reliability of the heat exchanger.

[0045] For example, the first fin 12 , the second fin 22 and the third fin 61 may be made of copper, aluminum, stainless steel, etc., preferably aluminum foil.

[0046] like Figure 7-Figure 9As shown, the first straight tube group 13 includes a first tube 131 and a second tube 132 arranged adjacently, and the projections of the first tube 131 and the second tube 132 in the Z direction do not overlap; the first straight tube group 13 also includes a third tube 133, and the projections of the third tube 133 and the second tube 132 in the Z direction do not overlap, and the projections of the third tube 133 and the first tube 131 in the Z direction overlap. Such a design enables the first straight tube group 13 to have a greater space utilization in the Z direction, which helps to increase the overall heat exchange area of ​​the evaporator, thereby improving the evaporation efficiency of the evaporator. At the same time, by reasonably arranging the first tube 131, the second tube 132 and the third tube 133 in the Z direction, the evaporator can be made more compact in structure, reducing the volume of the evaporator, which is beneficial to the installation and use of the evaporator.

[0047] Further, the first pipe fitting 131, the second pipe fitting 132 and the third pipe fitting 133 can all be set as straight pipes, and their length direction can extend along the X direction. Such a design makes the evaporator simpler in structure and convenient for manufacturing and processing. At the same time, the shape of the straight pipe also helps to improve the heat exchange efficiency of the evaporator, so that the heat exchange fluid can fully exchange heat with the fins outside the tube when flowing in the tube. In addition, the number of the first pipe fitting 131, the second pipe fitting 132 and the third pipe fitting 133 can be adjusted according to actual needs. For example, the number of the first pipe fitting 131, the second pipe fitting 132 and the third pipe fitting 133 can be determined according to factors such as the overall size of the evaporator and the heat exchange requirements to meet the needs of different application scenarios. In addition to the above-mentioned structural design, the evaporator of the utility model can also improve performance by optimizing other aspects of the design. For example, the heat exchange efficiency between the fins and the fluid can be improved by changing the shape, size and arrangement of the fins; the heat exchange efficiency can be improved by optimizing the flow path and flow rate of the heat exchange fluid.

[0048] Similarly, the second straight tube group 23 includes a fourth tube fitting 231 and a fifth tube fitting 232 arranged adjacent to each other, and the projections of the fourth tube fitting 231 and the fifth tube fitting 232 in the Z direction do not overlap; the second straight tube group 23 also includes a sixth tube fitting 233, and the projections of the sixth tube fitting 233 and the fifth tube fitting 232 in the Z direction do not overlap, and the projections of the sixth tube fitting 233 and the fourth tube fitting 231 in the Z direction overlap.

[0049] like Figure 7As shown, the first pipe fitting 131 and the fourth pipe fitting 231 are connected through the connecting pipe 60; the second pipe fitting 132 and the fifth pipe fitting 232 are connected through the connecting pipe 60; the third pipe fitting 133 and the sixth pipe fitting 233 are connected through the connecting pipe 60. Of course, in order to facilitate the docking of the first straight pipe group 13 and the second straight pipe group 23, the connecting pipe 60 is designed as a curved pipe, and a plurality of third fins 61 are provided at the corresponding positions of the connecting pipe 60. There is a certain angle between the first pipe fitting 131 and the fourth pipe fitting 231, and the angle is less than or equal to 90°. Similarly, there is a certain angle between the second pipe fitting 132 and the fifth pipe fitting 232, and the angle is less than or equal to 90°. There is a certain angle between the third pipe fitting 133 and the sixth pipe fitting 233, and the angle is less than or equal to 90°.

[0050] Continue to refer Fig.10 , Fig.10 Schematic diagram of the structure of the first fin 12; the first fin 12 includes a body 121 and a plurality of holes 122 arranged on the body 121, and the arrangement of the holes 122 corresponds to the straight tubes in the first straight tube group 13 and the straight tubes in the second straight tube group 23.

[0051] In order to facilitate the installation of the evaporator provided in the embodiment of the utility model, a first support plate 40 and a second support plate 50 are further included; the first support plate 40 is arranged outside the plurality of first fins 12; the second support plate 50 is arranged outside the plurality of second fins 22. The first support plate 40 and the second support plate 50 are provided with a plurality of through holes, through which the connecting member penetrates, so that the evaporator and the housing are installed and fixed.

[0052] In a second aspect, an embodiment of the present invention provides a method for preparing an evaporator, comprising:

[0053] The graphene coating and the diluent are mixed in a ratio of a:1 to form a mixed solution, wherein the value of a ranges from 9 to 11;

[0054] The mixed liquid is sprayed on the outer surface of the fins in the evaporator at room temperature, wherein the evaporator is divided into a first evaporation unit 10 and a second evaporation unit 20, and the first evaporation unit 10 and the second evaporation unit 20 are not coplanar;

[0055] The sprayed evaporator is solidified so that the mixed liquid on the fins forms a functional layer 30 .

[0056] For ease of understanding, the spraying process of a preparation method of an evaporator provided in an embodiment of the utility model is specifically as follows: dilute the graphene coating and the diluent in a ratio of a:1, where a can be 9, 10 or 11, and stir the mixed mixture evenly, pass the mixed mixture through a 300-mesh sieve, and spray at room temperature with a spraying thickness of 2μm-20μm; naturally cure for more than 24 hours or bake at 150°C for 30 minutes to quickly cure to obtain a functional layer.

[0057] Specifically, firstly, the main body 121 of the first fin 12, the second fin 22 and the third fin 61 is cut and punched to form the hole 122, and then cleaned and set aside; then the fin is sprayed to obtain the functional layer 30; the fin coated with the functional layer is assembled with the first straight tube group 13, the second straight tube group 23, the first support plate 40 and the second support plate 50.

[0058] In a third aspect, the embodiment of the utility model further provides an air conditioning device using the above evaporator. The air conditioning device includes a housing, a fan, a compressor, an evaporator and other components. Among them, the evaporator adopts the evaporator provided by the above embodiment, which has high heat exchange efficiency, good durability and safety.

[0059] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0060] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of this application and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An evaporator, characterized in that: Divided into a first evaporation unit and a second evaporation unit, wherein the first evaporation unit and the second evaporation unit are not coplanar; Wherein, the first evaporation unit comprises a first elbow, a first fin and a first straight tube group, the first elbow connects any two adjacent straight tubes in the first straight tube group, and the first fin is arranged on the outer surface of the first straight tube group; The second evaporation unit comprises a second elbow, a second fin and a second straight tube group, the second elbow connects any two adjacent straight tubes in the second straight tube group, and the second fin is arranged on the outer surface of the second straight tube group; The first straight tube group and the second straight tube group correspond to each other one by one and are connected, and the first straight tube group and the second straight tube group are not parallel; the outer surfaces of the first fin and the second fin are both provided with a functional layer, and the functional layer includes graphene.

2. The evaporator according to claim 1, characterized in that An evaporation area of ​​the first evaporation unit is greater than an evaporation area of ​​the second evaporation unit.

3. The evaporator according to claim 1 or 2, characterized in that: When there are multiple first fins, the first fins are arranged along the length direction of the straight tubes in the first straight tube group, and at least two of the multiple first fins are parallel; When there are multiple second fins, the second fins are arranged along the length direction of the straight tubes in the second straight tube group, and at least two of the multiple second fins are parallel; at least one first fin among the multiple first fins is parallel to at least one second fin among the multiple second fins.

4. The evaporator according to claim 3, characterized in that The plurality of straight tubes in the first straight tube group all penetrate each of the first fins; and the plurality of straight tubes in the first straight tube group all penetrate each of the second fins.

5. The evaporator according to claim 4, characterized in that The first straight tube group includes a first tube and a second tube arranged adjacent to each other, and the projections of the first tube and the second tube in the Z direction do not overlap; the first straight tube group also includes a third tube, and the projections of the third tube and the second tube in the Z direction do not overlap, and the projections of the third tube and the first tube in the Z direction overlap.

6. The evaporator according to claim 5, characterized in that The second straight tube group includes a fourth tube fitting and a fifth tube fitting arranged adjacent to each other, and the projections of the fourth tube fitting and the fifth tube fitting in the Z direction do not overlap; the second straight tube group also includes a sixth tube fitting, and the projections of the sixth tube fitting and the fifth tube fitting in the Z direction do not overlap, and the projections of the sixth tube fitting and the fourth tube fitting in the Z direction overlap.

7. The evaporator according to claim 6, characterized in that The first pipe fitting and the fourth pipe fitting are connected via a connecting pipe; the second pipe fitting and the fifth pipe fitting are connected via a connecting pipe; and the third pipe fitting and the sixth pipe fitting are connected via a connecting pipe.

8. The evaporator according to claim 1, characterized in that: It also includes a first support plate and a second support plate; the first support plate is arranged on the outside of the plurality of first fins; the second support plate is arranged on the outside of the plurality of second fins.

9. The evaporator according to claim 1, characterized in that: The thickness of the functional layer is 1 μm-9 μm.

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