Heat pump system

Abstract

The embodiment of the utility model provides a heat pump system. The heat pump system comprises an evaporator, a compressor and a condenser which are communicated in sequence. The evaporator absorbs heat in air to heat a medium, the compressor compresses the medium heated by the evaporator, and the compressed medium is subjected to heat exchange through the condenser; wherein the evaporator comprises an evaporator pipeline and fins arranged on the evaporator pipeline, and a first graphene coating is arranged on the outer surface of each fin; the condenser comprises a shell and a heat exchange tube set, the shell is provided with a containing cavity, the heat exchange tube set is arranged in the containing cavity, and a second graphene coating is arranged on the outer surface of the heat exchange tube set. The working efficiency of the heat pump system is improved.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of heat exchange, and in particular to a heat pump system. Background Art

[0002] In the context of the "coal to electricity" policy, air-source heat pumps have become a common heating method. Air-source heat pumps offer low operating costs, are energy-efficient and environmentally friendly, and can provide both cooling and heating, making them suitable for cold regions.

[0003] When conventional air source heat pump units are operated for heating in cold or extremely cold climates, the heat generated by the air source heat pump units decreases as the outdoor ambient temperature drops. At the same time, low-temperature heat pump units will frequently frost and defrost, or even incomplete defrosting, resulting in a serious decrease in heating capacity and the unit failing to operate normally. In addition, since existing air source heat pumps generally do not have descaling devices, they cannot prevent scale from forming in the unit. After long-term use, the unit will seriously scale, which will affect the water quality and shorten the service life of the compressor. The existing solution requires users to discharge sewage regularly, which is very troublesome to operate. Utility Model Content

[0004] An embodiment of the utility model provides a heat pump system for improving the working efficiency of the heat pump system.

[0005] In a first aspect, an embodiment of the present invention provides a heat pump system, comprising:

[0006] An evaporator, a compressor, and a condenser are sequentially connected; the evaporator absorbs heat from the air to heat the medium, the compressor compresses the medium heated by the evaporator, and the compressed medium exchanges heat through the condenser;

[0007] Wherein, the evaporator comprises an evaporator pipeline and a fin arranged on the evaporator pipeline, and the outer surface of the fin is provided with a first graphene coating;

[0008] The condenser includes a shell and a heat exchange tube group. The shell has a receiving cavity. The heat exchange tube group is arranged in the receiving cavity. The outer surface of the heat exchange tube group is provided with a second graphene coating.

[0009] The present invention provides a heat pump system, which is an energy circulation and transport device, including an evaporator, a compressor, and a condenser connected in sequence. First, the medium in the evaporator absorbs a large amount of free energy Q1 from the air; then, the compressor performs work Q2 to compress the medium that absorbs energy from the air into a high-temperature and high-pressure medium. Of course, the high-temperature and high-pressure medium can be a gas; the gas exchanges heat energy Q3 through the condenser to supply hot water or heating; according to the law of conservation of energy: heat energy Q3 = electrical energy Q2 + air energy Q1. The above is the entire energy conversion process of the heat pump system. Of course, in order to further improve the working efficiency of the heat pump system provided by the present invention, the evaporator includes an evaporator pipeline and fins arranged on the evaporator pipeline, and a first graphene coating is provided on the outer surface of the fin. The first graphene coating enhances the heat transfer coefficient, improves the heat transfer effect, improves the defrosting ability and heat transfer efficiency of the evaporator, and greatly improves the overall energy efficiency of the evaporator. In addition, a second graphene coating is provided on the outer surface of the heat exchange tube group of the condenser to improve the corrosion resistance of the shell and tube condenser, increase its applicability and service life in high-salt and high-acid environments, reduce scaling on the condenser surface, and improve overall energy efficiency during long-term operation.

[0010] Optionally, the heat pump system further includes a filter, which is arranged at the outlet of the condenser.

[0011] Optionally, the filter includes a filter assembly, and the filter assembly includes one or more of a filter element, a filter mesh or a filter layer.

[0012] Optionally, a liquid storage tank is provided on the pipeline between the filter and the condenser.

[0013] Optionally, an expansion valve is provided at the outlet of the filter.

[0014] Optionally, the thickness of the first graphene coating layer is the same as the thickness of the second graphene coating layer.

[0015] Optionally, the thickness of the first graphene coating is 1 μm-9 μm;

[0016] The thickness of the second graphene coating layer is 1 μm-9 μm.

[0017] Optionally, when there are multiple fins, there are at least two parallel fins among the multiple fins.

[0018] Optionally, the material of the fin includes one or more of copper, aluminum or stainless steel.

[0019] Optionally, the accommodating cavity includes two evenly distributed subspaces, and the heat exchange tube groups are evenly distributed in the two subspaces.

[0020] In a second aspect, an embodiment of the present invention provides a preparation method, which is applied to the heat pump system in the first aspect, comprising:

[0021] The graphene coating and the diluent are mixed at a ratio of a:1 to form a first graphene coating, where a is in a range of 9-11; the graphene coating and the diluent are mixed at a ratio of b:1 to form a second graphene coating, where b is in a range of 9-11;

[0022] The first graphene coating is sprayed on the outer surface of the fin in the evaporator at room temperature; the second graphene coating is sprayed on the outer surface of the heat exchange tube group in the condenser;

[0023] The first graphene coating on the fins of the evaporator after spraying is solidified; and the second graphene coating on the heat exchange tube group in the condenser after spraying is solidified. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0025] Figure 1 A schematic structural diagram of a heat pump system provided in an embodiment of the present utility model;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of an evaporator provided in an embodiment of the utility model Figure 1 ;

[0027] Figure 3 A schematic diagram of the three-dimensional structure of an evaporator provided in an embodiment of the utility model Figure 2 ;

[0028] Figure 4 A schematic diagram of an evaporator provided in an embodiment of the present invention Figure 1 ;

[0029] Figure 5 A schematic diagram of an evaporator provided in an embodiment of the present invention Figure 2 ;

[0030] Figure 6 A schematic diagram of an evaporator provided in an embodiment of the present invention Figure 3 ;

[0031] Figure 7A cross-sectional view of a fin in an evaporator provided by an embodiment of the present utility model;

[0032] Figure 8 A schematic structural diagram of an evaporator pipeline provided in an embodiment of the present utility model;

[0033] Figure 9 A schematic diagram of the external structure of a condenser provided in an embodiment of the utility model;

[0034] Figure 10 A side view of a condenser provided in an embodiment of the present utility model;

[0035] Figure 11 A cross-sectional view of a heat exchange tube group in a condenser provided in an embodiment of the utility model.

[0036] Figure 1: evaporator; 2: compressor; 3: condenser; 4: filter; 5: liquid storage tank; 6: expansion valve; 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: first graphene coating; 40: first support Plate; 50-second support plate; 60-connecting pipe; 61-third fin; 10'-shell; 11'-third temperature measuring port; 12'-drain outlet; 13'-base; 20'-heat exchange component; 21'-heat exchange tube group; 211'-body; 212'-second graphene coating; 22'-inlet pipe group; 221'-first inlet pipe; 222'-second inlet pipe; 23'-outlet pipe group; 231'-first outlet pipe; 232'-second outlet pipe; 30'-liquid inlet pipe; 31'-first temperature measuring port; 40'-liquid outlet pipe; 41'-exhaust port; 42'-water flow switch; 43'-second temperature measuring port. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] like Figure 1 As shown, in a first aspect, an embodiment of the present invention provides a heat pump system, comprising:

[0039] The evaporator 1, compressor 2 and condenser 3 are connected in sequence; the evaporator 1 absorbs heat from the air to heat the medium, the compressor 2 compresses the medium heated by the evaporator 1, and the compressed medium passes through the condenser 3 for heat exchange;

[0040] The evaporator 1 includes an evaporator pipeline and a fin arranged on the evaporator pipeline 1, and the outer surface of the fin is provided with a first graphene coating 30;

[0041] The condenser 3 includes a shell 10 ′ and a heat exchange tube group 21 ′. The shell 10 ′ has a receiving cavity. The heat exchange tube group 21 ′ is arranged in the receiving cavity. The outer surface of the heat exchange tube group 21 ′ is provided with a second graphene coating 212 ′.

[0042] The present invention provides a heat pump system, which is an energy circulation and transport device, including an evaporator 1, a compressor 2, and a condenser 3 connected in sequence. First, the medium in the evaporator 1 absorbs a large amount of free energy Q1 from the air; then, the compressor 2 performs work Q2, compressing the medium that has absorbed the energy from the air into a high-temperature and high-pressure medium. Of course, the high-temperature and high-pressure medium can be a gas; the gas exchanges heat energy Q3 through the condenser 3 to supply hot water or heating; according to the law of conservation of energy: heat energy Q3 = electrical energy Q2 + air energy Q1, the above is the entire energy conversion process of the heat pump system. Of course, in order to further improve the working efficiency of the heat pump system provided by the present invention, the evaporator 1 includes an evaporator pipeline and fins arranged on the evaporator pipeline, and a first graphene coating 30 is provided on the outer surface of the fin. The first graphene coating 30 enhances the heat transfer coefficient, improves the heat transfer effect, improves the defrosting ability and heat transfer efficiency of the evaporator 1, and greatly improves the overall energy efficiency of the evaporator 1. In addition, a second graphene coating 2121' is provided on the outer surface of the heat exchange tube group 21' of the condenser 3 to improve the corrosion resistance of the shell and tube condenser, increase the applicability and service life in high salt and high acid environments, reduce scaling on the condenser surface, and improve the overall energy efficiency during long-term operation.

[0043] In some specific embodiments, the heat pump system further includes a filter 4, which is disposed at the outlet of the condenser 3. Specifically, the filter 4 includes a filter assembly, which includes one or more of a filter element, a filter screen, or a filter layer. For example, the filter element may be a PP cotton filter element, the filter screen may be a fine filter screen, and the filter layer may be an activated carbon filter layer. The provision of the filter 4 can effectively filter out impurities and dirt at the outlet of the condenser 3, preventing impurities and dirt from entering other parts of the heat pump system and protecting the normal operation of the heat pump system. At the same time, the filter 4 can also filter out solid particles and microorganisms in the medium, ensuring the cleanliness and stability of the medium in the heat pump system, thereby improving the operating efficiency and reliability of the heat pump system.

[0044] In addition, the heat pump system provided by the embodiment of the present invention may further include a liquid storage tank 5 and an expansion valve 6. The liquid storage tank 5 is provided on the pipeline between the filter 4 and the condenser 3. Optionally, an expansion valve 6 is provided at the outlet of the filter 4. The liquid storage tank 5 is provided at the outlet of the evaporator 1 to store the liquid medium and ensure an adequate supply of the medium in the evaporator 1. The expansion valve 6 is provided at the inlet of the evaporator 1 to control the flow rate and pressure of the medium and ensure a stable flow of the medium in the evaporator 1 and a good heat exchange effect.

[0045] In specific application scenarios, the heat pump system provided by the embodiments of the present invention can be used for heating and cooling in homes, commercial businesses, and industrial environments. In heating mode, the medium absorbs heat from the air in evaporator 1. After being compressed by compressor 2, the high-temperature, high-pressure medium releases heat in condenser 3, providing indoor heating. In cooling mode, the medium absorbs heat from the room in condenser 3. After being compressed by compressor 2, the high-temperature, high-pressure medium releases heat in evaporator 1, achieving indoor cooling.

[0046] In summary, the heat pump system provided by the present embodiment improves the heat exchange efficiency and corrosion resistance of the evaporator 1 and condenser 3 by providing the first graphene coating 30 and the second graphene coating 212', thereby enhancing the overall efficiency and reliability of the heat pump system. Furthermore, the provision of components such as the filter 4, the liquid storage tank 5, and the expansion valve 6 ensures stable operation and cleanliness of the heat pump system. Therefore, the heat pump system provided by the present embodiment has broad application prospects and market value.

[0047] To facilitate understanding of the evaporator 1, the specific structure of the evaporator 1 is described in detail below:

[0048] Specific reference Figure 2-Figure 8The evaporator 1 provided by the embodiment of the present invention is divided into a first evaporation unit 10 and a second evaporation unit 20. The first evaporation unit 10 and the second evaporation unit 20 are not coplanar; the evaporation pipeline includes: a first elbow 11 and a first straight tube group 13 in the first evaporation unit 10, and the second evaporation unit 20 includes a second elbow 21 and a second straight tube group 23, wherein the first evaporation unit 10 includes a first elbow 11, a first fin 12 and a first straight tube group 13, the first elbow 11 connects any two adjacent straight tubes in the first straight tube group 13, 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, 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 first graphene coating 30, and the first graphene coating 30 includes graphene. Graphene has excellent thermal conductivity and hydrophobicity. The utility model changes the surface properties of the evaporator fins, and the first graphene coating 30 includes graphene and epoxy resin, that is, prepares an epoxy resin graphene electric heating coating evaporator, combines the frost suppression performance of the graphene super hydrophobic coating with the characteristics of uniform surface heating of epoxy resin, so as to achieve the purpose of energy saving and emission reduction.

[0049] The evaporator 1 here includes a first evaporation unit 10 and a second evaporation unit 20 that are not coplanar. The evaporator 1 is bent into two non-coplanar parts, which increases the overall heat exchange area of the evaporator 1 without increasing the volume of the evaporator 1; that is, by bending the first evaporation unit 10 and the second evaporation unit 20 of the evaporator 1, 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 evaporator 1, a first wing is provided on the first straight tube group 13 in the first evaporation unit 10. The first fin 12 is provided with a second straight tube group 23 in the second evaporation unit 20. A first graphene coating 30 is sprayed on the outer surfaces of the first fin 12 and the second fin 22. The first graphene coating 30 comprises graphene. The first graphene coating 30 provides hydrophobic properties. Due to its low surface energy, water vapor has difficulty in nucleating on the fin surface coated with the first graphene coating 30, thereby achieving the goal of preventing or minimizing frost on the treated evaporator surface. The first graphene coating 30 also prevents scaling, thereby extending the service life of the evaporator. The high thermal conductivity and large specific surface area of the graphene material can be utilized to improve the heat exchange performance and efficiency of the evaporator, thereby achieving energy conservation and emission reduction. Furthermore, the simple operation of spraying the first graphene coating 30 on the outer surfaces of the first fin 12 and the second fin 22 can prevent scaling, avoiding the tedious operations of adding scale inhibitors, thereby simplifying the operation and effectively reducing costs.

[0050] In some specific embodiments, the evaporation area of the first evaporation unit 10 is larger than that of the second evaporation unit 20, meaning that the first evaporation unit 10 serves as the primary evaporation structure. This is because, in practical applications, since the first evaporation unit 10 is farther from the heat source, to prevent excessive heat loss while still ensuring evaporation, the first evaporation unit 10, which requires a larger evaporation area, is positioned farther from the inlet 234 and outlet 235. The second evaporation unit 20, on the other hand, is closer to the heat source and can have a relatively smaller evaporation area to prevent excessive heat loss from the heat exchange fluid entering through the inlet 234 as it passes through the second evaporation unit 20. This design makes the overall evaporator structure more rational and improves heat exchange efficiency.

[0051] 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 first fin 12 among the multiple first fins 12 is parallel to at least one second fin 22 among 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 less likely to cause problems such as excessive heat in a certain area. In other words, 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 first graphene coating 30.

[0052] Furthermore, to make the evaporator more adaptable to various application scenarios, the evaporator of the present invention can also adopt a variety of design variations. For example, the first evaporation unit 10 and the second evaporation unit 20 can have different shapes to meet different spatial layout requirements. By adopting a first graphene coating 30 and a reasonable structural design and layout, the evaporator of the present invention achieves multiple advantages, such as preventing frost, improving heat exchange efficiency, and reducing energy consumption. It has broad application prospects and market value. Furthermore, the evaporator of the present invention can also adopt a variety of design variations to adapt to different application scenarios, making it more practical and flexible.

[0053] In some specific embodiments, the multiple straight tubes in the first straight tube group 13 all penetrate each first fin 12; and the multiple straight tubes in the first straight tube group 13 all penetrate each second fin 22. The spacing between two adjacent first fins 12 ranges from 1 mm to 3 mm. For example, the spacing between two adjacent first fins 12 can be 1 mm, 2 mm, or 3 mm, and 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 1 mm to 3 mm. For example, the spacing between two adjacent second fins 22 can be 1 mm, 2 mm, or 3 mm, and 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 distance between two adjacent first fins 12 decreases, the thickness of the first graphene coating 30 decreases accordingly to ensure a balance between the heat exchange efficiency and corrosion resistance of the heat exchanger. The distance between the first fins is d1, and the thickness of the first graphene coating is d2. Preferably, d1:d2 is 200:1.

[0054] like Figure 7As shown, a first graphene coating 30 is provided on the outer surface of each of the first fin 12 and the second fin 22. The first graphene coating 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 first graphene coating 30 is 1 μm-9 μm. For example, the thickness of the first graphene coating 30 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, or 9 μm. Of course, the first graphene coating 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. A typical characteristic of epoxy resin is its strong adhesion. This is due to the large, active oxygen-containing groups in the epoxy molecular structure, which are very active and easily react with other groups. They also have strong adhesion, which can improve the shear strength of the material. Secondly, epoxy resin is highly stable and corrosion-resistant, and when uncured, it is soluble in most organic solvents. More importantly, after curing, the molecular spacing in the epoxy resin system becomes closer, forming a stable three-dimensional network structure that can be mixed with other materials in any proportion, resulting in epoxy resin's excellent processing properties. Because graphene is a lightweight material, it can help reduce the size and weight of the heat exchanger. By using a first graphene coating 30 that mixes graphene with epoxy resin material and sprays it on the outer surface of the heat exchanger, the heat exchanger can have higher heat transfer efficiency, better durability and safety, while reducing its size and weight, which is beneficial for improving the overall performance and reliability of the heat exchanger.

[0055] 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.

[0056] like Figure 8 As shown, the first straight tube group 13 includes a first tube 131 and a second tube 132 arranged adjacent to each other, with the projections of the first tube 131 and the second tube 132 in the Z direction not overlapping. The first straight tube group 13 also includes a third tube 133, with the projections of the third tube 133 and the second tube 132 in the Z direction not overlapping, and the projections of the third tube 133 and the first tube 131 in the Z direction overlapping. This design allows the first straight tube group 13 to have greater space utilization in the Z direction, helping to increase the overall heat exchange area of the evaporator, thereby improving the evaporation efficiency of the evaporator. At the same time, by rationally 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 its volume and facilitating its installation and use.

[0057] Furthermore, the first, second, and third tubes 131, 132, and 133 can all be straight tubes, with their lengths extending in the X-direction. This design simplifies the evaporator's structure and facilitates manufacturing and processing. The straight tube shape also helps improve the evaporator's heat exchange efficiency, allowing the heat exchange fluid flowing within the tubes to fully exchange heat with the fins outside the tubes. Furthermore, the number of first, second, and third tubes 131, 132, and 133 can be adjusted according to actual needs. For example, the number of first, second, and third tubes 131, 132, 133 can be determined based on factors such as the overall size of the evaporator and heat exchange requirements to meet the needs of different application scenarios. In addition to the aforementioned structural design, the evaporator of the present invention can also improve performance through optimization of other design aspects. 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; and the heat exchange efficiency can be improved by optimizing the flow path and flow rate of the heat exchange fluid.

[0058] 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.

[0059] like Figure 8 As 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; and 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 straight first 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°.

[0060] For ease of understanding, the specific structure of the condenser 3 is as follows:

[0061] like Figure 9 As shown, the embodiment of the present invention provides a condenser 3, comprising:

[0062] The shell 10' has a accommodating cavity, which is divided into a first subspace and a second subspace that are connected to each other. The first subspace and the second subspace are arranged along the longitudinal direction of the shell 10'; the shell 10' has a liquid inlet and a liquid outlet that are both connected to the accommodating cavity. Along the longitudinal direction of the shell 10', the liquid inlet and the liquid outlet are respectively arranged at both ends of the shell 10'; wherein the liquid outlet is connected to the liquid outlet pipe 40', and the liquid outlet pipe 40' is provided with an exhaust port 41', a water flow switch 42' and a second temperature measuring port 43'. Specifically, when the liquid flows out of the outlet, When the high-temperature liquid is volatile, the gas is discharged by controlling the exhaust port 41' to effectively prevent excessive pressure in the liquid outlet pipe 40'. The water flow switch 42' on the liquid outlet pipe 40' is used to control the outflow rate of the high-temperature fluid on the liquid outlet pipe 40'. Similarly, the second temperature measuring port 43' monitors in real time whether the temperature of the high-temperature fluid flowing out of the liquid outlet pipe 40' meets the requirements. If the temperature is too high, the fluid flowing out of the liquid outlet pipe 40' will pass through the condenser again for cooling again to ensure the temperature of the cooled fluid flowing out of the liquid outlet pipe 40'. Here, the liquid inlet is connected to the liquid inlet pipe 30'. Specifically, a first temperature measuring port 31' is provided on the liquid inlet pipe 30'. The first temperature measuring port 31' detects the temperature of the high-temperature fluid entering the condenser shell 10' in real time. Of course, in order to ensure the overall cooling effect of the condenser provided by the embodiment of the present invention, the temperature detection between the first temperature measuring port 31', the second temperature measuring port 43' and the third temperature measuring port 11' is carried out to obtain the temperatures of the temperature measuring ports at three different positions in real time, so as to facilitate timely control of the flow rate or temperature of the high-temperature fluid entering the shell 10', and at the same time control the flow rate or temperature of the low-temperature fluid entering from the inlet pipe group 22', thereby greatly improving the overall heat exchange efficiency of the condenser provided by the embodiment of the present invention.

[0063] The heat exchange assembly 20' includes a heat exchange tube group 21', an inlet tube group 22' and an outlet tube group 23'. The heat exchange tube group 21' is arranged in the accommodating cavity. The inlet tube group 22' and the outlet tube group 23' are both connected to the heat exchange tube group 21'. The inlet tube group 22' and the outlet tube group 23' are located at the same end of the shell 10'; wherein the heat exchange tube group 21' includes a first heat exchange tube located in the first subspace and a second heat exchange tube located in the second subspace. The outer surfaces of the first heat exchange tube and the second heat exchange tube are both provided with a second graphene coating 212'. The second graphene The coating 212' includes graphene, that is, the first heat exchange tube includes a body 211' and a second graphene coating 212' arranged on the outer surface of the body 211'; the inlet tube group 22' includes a first inlet tube 221' and a second inlet tube 222', the first inlet tube 221' is connected to the first heat exchange tube, and the second inlet tube 222' is connected to the second heat exchange tube; the outlet tube group 23' includes a first outlet tube 231' and a second outlet tube 232', the first outlet tube 231' is connected to the first heat exchange tube, and the second outlet tube 232' is connected to the second heat exchange tube.

[0064] It should be noted that the condenser provided by the embodiment of the present invention includes a shell 10' and a heat exchange component 20'. The shell 10' has a receiving cavity, which is divided into two parts, namely a first subspace and a second subspace. The first subspace and the second subspace are arranged along the longitudinal direction of the shell 10'. A liquid outlet and a liquid inlet are provided on the shell 10', and the liquid outlet and the liquid inlet are arranged along the longitudinal direction of the shell 10'. Since the distance between the liquid inlet and the liquid outlet is at both ends of the shell 10', high-temperature liquid enters from the liquid inlet and flows out from the liquid outlet. A sufficiently long flow path is ensured, and the fluid can then flow through the first subspace and the second subspace, thereby increasing the heat exchange space of the high-temperature fluid and improving the cooling effect of the high-temperature fluid that needs to be cooled. Since the first subspace and the second subspace are connected, the path through which the high-temperature fluid flows includes at least the first subspace and the second subspace, and when there is a certain temperature difference between the first subspace and the second subspace, heat exchange can be carried out between the first subspace and the second subspace that are connected to each other, so as to further improve the heat exchange efficiency. The heat exchange assembly 20' includes a heat exchange tube group 21' , inlet pipe group 22 'and outlet pipe group 23 ', the heat exchange pipe group 21 'is located in the accommodating cavity of the shell 10 ', and the low-temperature fluid is introduced through the inlet pipe group 22 ', and the low-temperature fluid after heat exchange with the high-temperature fluid flows out through the outlet pipe group, wherein the heat exchange assembly 20 'comprises a first heat exchange pipe and a second heat exchange pipe, the inlet pipe group 22 'comprises a first inlet pipe 221 'and a second inlet pipe 222 ', the first inlet pipe 221 'is connected to the first heat exchange pipe, and the second inlet pipe 222 'is connected to the second heat exchange pipe; the outlet pipe group 23 'comprises a first outlet pipe 231 'and The second outlet pipe 232' and the first outlet pipe 231' are connected to the first heat exchange pipe, and the second outlet pipe 232' is connected to the second heat exchange pipe. The first heat exchange pipe is located in the first subspace, and the second heat exchange pipe is located in the second subspace. A second graphene coating 212' is provided on the outer surfaces of both the first and second heat exchange pipes. This second graphene coating 212' comprises graphene, which fully utilizes the excellent properties of graphene, such as high thermal conductivity, corrosion resistance, and high mechanical strength, to solve a series of problems with the heat exchange pipe assembly 21' of the traditional condenser, such as corrosion, scaling, and reduced condensation efficiency. Because the mass of the graphene coating is smaller than the thermal conductive layer of conventional metal products and graphene has excellent thermal conductivity, it is the carbon material with the highest thermal conductivity to date. Utilizing the thermal properties of graphene here ensures that the condenser's condensation efficiency is not reduced. It is only necessary to simply provide a second graphene coating 212' having graphene on the outer surface of the heat exchange tube group 21'. The preparation process is simple. The second graphene coating 212' is well bonded to the heat exchange tube group 21', has good toughness, and can be bent. That is, the heat exchange tube group 21' can be bent and deformed according to the accommodation space requirements of the shell 10', can withstand a certain degree of mechanical impact, has a stable effect, and has a long service life.

[0065] Continue to refer Figure 9 In the longitudinal direction of the shell 10', a third temperature measuring port 11' is provided on the surface of one side of the shell 10' away from the inlet pipe group 22' and the outlet pipe group 23', which is used to detect the temperature of the high-temperature fluid in the internal accommodating cavity of the shell 10' in real time. At the same time, a drain port 12' is provided at the bottom of the shell 10'. Since when a high-temperature fluid is passed into the accommodating cavity inside the shell 10', if the temperature of the high-temperature fluid drops, problems such as crystallization may occur, a drain port 12' is provided at the bottom of the shell 10' to facilitate the discharge of impurities or crystals in the high-temperature fluid. In order to facilitate the installation of a condenser 1 provided in an embodiment of the utility model, a base 13' is installed at the bottom of the condenser.

[0066] Of course, the heat exchange tube group 21' includes a first heat exchange tube and a second heat exchange tube. The number of the first heat exchange tube and the second heat exchange tube is an odd number. The shape of the first heat exchange tube and the second heat exchange tube is a U-shaped tube. If there is one first heat exchange tube, the first heat exchange tube is a U-shaped tube; if there are three first heat exchange tubes, the first heat exchange tube is arranged in an S-shaped manner; similarly, if there is one second heat exchange tube, the second heat exchange tube is a U-shaped tube; if there are three second heat exchange tubes, the first heat exchange tube is arranged in an S-shaped manner. According to the heat exchange efficiency of a condenser provided by an embodiment of the utility model and the internal space of the accommodating cavity of the shell 10', the number of the first heat exchange tube and the second heat exchange tube is adjusted.

[0067] like Figure 11 As shown, the thickness of the second graphene coating 212 ′ is 1 μm-9 μm. For example, the thickness of the second graphene coating 212 ′ is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, or 9 μm.

[0068] In some specific embodiments, the first subspace and the second subspace are of the same size and are arranged horizontally. A first heat exchange tube is placed in the first subspace, which is connected to the first inlet tube 221' and the first outlet tube 231', and the first heat exchange tube is filled with a low-temperature fluid. Of course, a second heat exchange tube is placed in the second subspace, which is connected to the second inlet tube 222' and the second outlet tube 232', and the first heat exchange tube is filled with a low-temperature fluid. In other words, heat exchange is performed independently with the first subspace through the first heat exchange tube, the first inlet tube 221', and the first outlet tube 231'; similarly, heat exchange is performed independently with the second subspace through the second heat exchange tube, the second inlet tube 222', and the second outlet tube 232'. Furthermore, if there is a certain temperature difference between the first subspace and the second subspace, the temperature can be adjusted by adjusting the cold fluid entering the first inlet pipe 221' and the second inlet pipe 222' in real time. At the same time, the first subspace and the second subspace are two connected spaces. That is, if there is a temperature difference between the first subspace and the second subspace, the temperature can be adjusted at any time, thereby effectively improving the heat exchange efficiency of the condenser.

[0069] Optionally, the diameter of the first heat exchange tube is 6mm-9mm, for example, the diameter of the first heat exchange tube is 6mm, 7mm, 8mm or 9mm; the length of the first heat exchange tube is 2.5m-3.5m, for example, the length of the first heat exchange tube is 2.5m, 3m or 3.5m. The diameter of the second heat exchange tube is 6mm-9mm, for example, the diameter of the second heat exchange tube is 6mm, 7mm, 8mm or 9mm; the length of the second heat exchange tube is 2.5m-3.5m, for example, the length of the second heat exchange tube is 2.5m, 3m or 3.5m. Of course, the length of the first heat exchange tube can be the same as or different from the length of the second heat exchange tube; similarly, the diameter of the first heat exchange tube can be the same as or different from the diameter of the second heat exchange tube.

[0070] Continue to refer Figure 9 , it has two opposite surfaces along the length direction of the shell 10', and a plurality of openings are provided on one of the two surfaces. The first inlet pipe 221' is communicated with one of the plurality of openings, and the second inlet pipe 222' is communicated with one of the plurality of openings; the first outlet pipe 231' is communicated with one of the plurality of openings, and the second outlet pipe 232' is communicated with one of the plurality of openings; the opening communicated with the first inlet pipe 221' is higher than the opening communicated with the first outlet pipe 231', and the opening communicated with the second inlet pipe 222' is higher than the opening communicated with the second outlet pipe 232'.

[0071] It is understandable that if Figure 9 As shown, combined with Figure 10The first inlet pipe 221' is connected to the first heat exchange pipe. A low-temperature fluid is introduced from the first inlet pipe 221' and then enters the first heat exchange pipe. In the process of the low-temperature fluid flowing through the first heat exchange pipe, heat is exchanged with the high-temperature fluid outside the first heat exchange pipe. For example, the low-temperature fluid can be a low-temperature gas, that is, the low-temperature gas can be liquid nitrogen or liquid helium; of course, the low-temperature gas after flowing through the first heat exchange pipe will become liquid after absorbing heat. In order to facilitate the discharge of the liquid after absorbing heat, the height of the first outlet pipe 231' is to be lower than the height of the first inlet pipe 221'. Similarly, the second inlet pipe 222' is connected to the second heat exchange pipe. A low-temperature fluid is introduced from the second inlet pipe 222' and then enters the second heat exchange pipe. During the process of the low-temperature fluid flowing through the second heat exchange pipe, heat is exchanged with the high-temperature fluid outside the second heat exchange pipe. For example, the low-temperature fluid can be a low-temperature gas, that is, the low-temperature gas can be liquid nitrogen or liquid helium. Of course, the low-temperature gas that flows through the second heat exchange pipe will become liquid after absorbing heat. In order to facilitate the discharge of the liquid that has absorbed heat, the height of the second outlet pipe 232' must be lower than the height of the second inlet pipe 222'.

[0072] like Figure 10 As shown, the opening communicating with the first inlet pipe 221' and the opening communicating with the first outlet pipe 231' are arranged vertically, while the opening communicating with the second inlet pipe 222' and the opening communicating with the second outlet pipe 232' are also arranged vertically. The opening communicating with the first inlet pipe 221' and the opening communicating with the second inlet pipe 222' are arranged horizontally. The opening communicating with the first inlet pipe 221' and the opening communicating with the second inlet pipe 222' are located at the same height; the opening communicating with the first outlet pipe 231' and the opening communicating with the second outlet pipe 232' are also located at the same height.

[0073] Here, the low-temperature fluid flows through the first inlet pipe 221', the first heat exchange pipe, and the first outlet pipe 231' with a first resistance, and flows through the second inlet pipe 222', the second heat exchange pipe, and the second outlet pipe 232' with a second resistance. Designing the first outlet pipe 231' and the second outlet pipe 232' to be at the same height, and designing the first inlet pipe 221' and the second inlet pipe 222' to be at the same height, can ensure that the first resistance and the second resistance are as close as possible, thereby ensuring smoother flow of the low-temperature fluid in the condenser, reducing fluid flow resistance, and further improving the heat exchange efficiency of the condenser. At the same time, this design is also conducive to reducing the manufacturing cost and maintenance cost of the condenser and improving the service life and stability of the condenser.

[0074] In actual applications, the structure of the condenser can be further optimized and improved according to the specific needs and working environment of the condenser. For example, a thermal insulation layer can be provided on the outer surface of the shell 10' to reduce heat loss and improve the thermal efficiency of the condenser. In addition, a plurality of independent subspaces can be provided in the first subspace of the condenser, and an independent heat exchange tube group 21' can be provided in each subspace to better control the temperature of each subspace and further improve the heat exchange efficiency of the condenser. Similarly, a plurality of independent subspaces can also be provided in the second subspace, and an independent heat exchange tube group 21' can be provided in each subspace to better control the temperature of each subspace and further improve the heat exchange efficiency of the condenser.

[0075] In summary, by providing a second graphene coating 212' and rationally designing and adjusting parameters such as the number, diameter, and length of the first and second heat exchange tubes, the heat exchange efficiency and service life of the condenser can be effectively improved. Furthermore, this condenser offers advantages such as a simple structure, low manufacturing cost, and easy maintenance, and has broad application prospects and market demand.

[0076] For ease of understanding, the working principle of a condenser 3 provided in the embodiment of the present invention is described below in conjunction with the working process of the condenser. Figure 11 The following instructions are given:

[0077] The condensation process is divided into three stages: first, a low-temperature fluid flows through the heat exchange tube assembly 21', where it undergoes convection heat exchange with the inner wall of the heat exchange tube assembly 21'; then, the inner wall of the heat exchange tube assembly 21' exchanges heat with the single-layer cylindrical wall of the outer wall of the heat exchange tube assembly 21'; and finally, the outer wall of the heat exchange tube assembly 21' exchanges heat with the external high-temperature fluid in the housing 10'. To improve heat exchange efficiency, the heat exchange tube assembly 21' can be made of metal, such as copper.

[0078] Using a spray coating process, after adding a graphene surface coating, the original single-layer heat exchange tube group 21' heat dissipation is equivalent to a double-layer heat exchange tube group 21' heat exchange. At the same time, the medium for convective heat exchange between the outer wall of the heat exchange tube group 21' and the high-temperature liquid in the housing 10' cavity is replaced by a second graphene coating 212' containing a graphene coating. The entire heat exchange process becomes: first, the low-temperature fluid in the heat exchange tube group 21' convects heat with the inner wall of the heat exchange tube group 21'; then, the inner wall of the heat exchange tube group 21' exchanges heat with the outer wall of the heat exchange tube group 21', and then the outer wall of the heat exchange tube group 21' exchanges heat with the double-layer cylindrical wall of the second graphene coating 212'; finally, the outer wall of the heat exchange tube group 21' exchanges heat with the external high-temperature fluid.

[0079] In a second aspect, an embodiment of the present invention provides a preparation method, which is applied to the heat pump system in the first aspect, comprising:

[0080] The graphene coating and the diluent are mixed at a ratio of a:1 to form a first graphene coating, where a is in a range of 9-11; the graphene coating and the diluent are mixed at a ratio of b:1 to form a second graphene coating, where b is in a range of 9-11;

[0081] A first graphene coating is sprayed on the outer surface of the fins in the evaporator at room temperature; a second graphene coating is sprayed on the outer surface of the heat exchange tube group in the condenser;

[0082] The first graphene coating on the fins of the evaporator after spraying is solidified; the second graphene coating on the heat exchange tube group in the condenser after spraying is solidified.

[0083] The present invention provides a method for preparing an evaporator, comprising:

[0084] The graphene coating and the diluent are mixed at a ratio of a:1 to form a mixed solution, where the value of a ranges from 9 to 11;

[0085] 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;

[0086] The evaporator after spraying is solidified so that the mixed liquid on the fins forms the first graphene coating 30 .

[0087] For ease of understanding, the spraying process of a preparation method of an evaporator provided in an embodiment of the present invention is specifically as follows: diluting the graphene coating and the diluent in a ratio of a:1, where a can be 9, 10 or 11, and stirring the mixed liquid evenly. The mixed liquid is passed through a 300-mesh sieve and sprayed at room temperature with a spraying thickness of 2μm-20μm; naturally curing for more than 24 hours or baking at 150°C for 30 minutes for rapid curing to obtain a first graphene coating.

[0088] Specifically, first, the main body 121 of the first fin 12, the second fin 22 and the third fin 61 is cut and punched to form a hole 122, and then cleaned and set aside; then the fins are sprayed to obtain a first graphene coating 30; the fins coated with the first graphene coating are 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.

[0089] The present invention provides a method for preparing a condenser.

[0090] The graphene coating and the diluent are mixed in a ratio of a:1 to form a mixed solution, where the value of a ranges from 9 to 11, and the mixed solution is matured;

[0091] The outer surface of the heat exchange tube group 21' in the condenser is sprayed with the matured mixed liquid at room temperature;

[0092] The sprayed heat exchange tube group 21 ′ is solidified so that the mixed liquid on the heat exchange tube group 21 ′ forms a second graphene coating 212 ′.

[0093] For ease of understanding, the spraying process of a preparation method of a condenser provided in an embodiment of the present invention 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 liquid evenly. The mixed liquid is passed through a 300-mesh sieve, and the outer surface of the heat exchange tube group 21 is cleaned with anhydrous ethanol and blown dry with compressed air.

[0094] Optionally, spraying the matured mixed liquid on the outer surface of the heat exchange tube group 21' in the condenser at room temperature specifically includes: using a spray gun with a diameter less than 1 mm to spray the outer surface of the heat exchange tube group 21' at room temperature, with a spraying thickness of 2μm-20μm; for example, the spraying thickness can be 2μm, 10μm, 15μm or 20μm.

[0095] Optionally, curing the sprayed heat exchange tube group 21' includes at least one of the following methods:

[0096] Method 1: Dry the prefabricated parts at room temperature; for example, dry them at room temperature for 30 minutes, or leave them at room temperature for more than 24 hours to cure naturally;

[0097] Method 2: baking in an oven, for example, at 150° C. for 30 minutes to quickly solidify the second graphene coating 212 ′.

[0098] Depending on the working conditions, the above coating process can be repeated 2 times or more to achieve the most suitable and stable effect under the actual working conditions.

[0099] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional 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 that fall within the scope of the present invention.

[0100] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of this application and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A heat pump system, characterized in that: include: An evaporator, a compressor and a condenser connected in sequence; The evaporator absorbs heat from the air to heat the medium, the compressor compresses the medium heated by the evaporator, and the compressed medium exchanges heat through the condenser; Wherein, the evaporator comprises an evaporator pipeline and a fin arranged on the evaporator pipeline, and the outer surface of the fin is provided with a first graphene coating; The condenser includes a shell and a heat exchange tube group. The shell has a receiving cavity. The heat exchange tube group is arranged in the receiving cavity. The outer surface of the heat exchange tube group is provided with a second graphene coating.

2. The heat pump system according to claim 1, wherein The heat pump system further includes a filter disposed at an outlet of the condenser.

3. The heat pump system according to claim 2, wherein: The filter comprises a filter assembly, and the filter assembly comprises one or more of a filter element, a filter screen or a filter layer.

4. The heat pump system according to claim 2, wherein: A liquid storage tank is provided on the pipeline between the filter and the condenser.

5. The heat pump system according to claim 4, wherein: An expansion valve is provided at the outlet of the filter.

6. The heat pump system according to claim 1, wherein: The thickness of the first graphene coating layer is the same as the thickness of the second graphene coating layer.

7. The heat pump system according to claim 1, wherein: The thickness of the first graphene coating is 1 μm-9 μm; The thickness of the second graphene coating layer is 1 μm-9 μm.

8. The heat pump system according to claim 1, wherein: When there are a plurality of fins, there are at least two parallel fins among the plurality of fins.

9. The heat pump system according to claim 1, wherein: The accommodating cavity includes two evenly distributed subspaces, and the heat exchange tube groups are evenly distributed in the two subspaces.

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