Air conditioner

Abstract

The utility model discloses an air conditioner, and belongs to the technical field of air treatment. The air conditioner comprises a shell; the fan is arranged in the shell and used for driving air to flow; the micro-channel heat exchanger is used for exchanging heat with air driven by the fan, and the micro-channel heat exchanger comprises a flat pipe used for circulating a refrigerant; the fin comprises a fin body part, a fin body part and a fin body part, and the flat pipe is inserted into the fin body part; the at least one sharp part is close to the lower surface of the flat pipe and connected to the fin body part, and the top end of the sharp part is a sharp end and used for puncturing water drops when making contact with the water drops on the lower surface of the flat pipe. The air conditioner can shorten the drainage time of the micro-channel heat exchanger.

Description

Technical Field

[0001] The present application relates to the technical field of air treatment, and in particular to an air conditioner. Background Art

[0002] An air conditioner is a device used to regulate the temperature, humidity, cleanliness, or airflow of indoor air. It regulates the indoor air by discharging cooled air obtained through a refrigeration cycle, which typically involves compression, condensation, expansion, and evaporation of a refrigerant. Alternatively, it can reversibly heat the air and discharge it into the indoor space. Heat exchangers are used in both the condensation and evaporation stages of the refrigeration cycle.

[0003] The heat exchangers in existing air conditioners are mostly traditional fin-and-tube heat exchangers. While microchannel heat exchangers have attracted widespread attention for their high efficiency and low cost, they utilize horizontally arranged flat tubes. When operating in low-temperature conditions, condensed water tends to accumulate on the tube surfaces, prolonging the microchannel heat exchanger's drain cycle. This trapped water quickly freezes during the next heating cycle, significantly reducing heat exchanger performance. Utility Model Content

[0004] The present application provides an air conditioner that can shorten the drainage time of a microchannel heat exchanger.

[0005] In one aspect of the present application, an air conditioner includes: a housing; a fan, which is arranged in the housing and is used to drive air flow; and a microchannel heat exchanger, which is used to exchange heat with the air driven by the fan, the microchannel heat exchanger includes: flat tubes, which are used to circulate refrigerant; fins, the fins include: a fin body, on which the flat tubes are inserted; at least one sharp portion, close to the lower surface of the flat tube and connected to the fin body, the top of the sharp portion is a pointed tip, which is used to puncture water droplets when it contacts water droplets on the lower surface of the flat tube.

[0006] In this technical solution, a sharp portion is provided below the flat tube on the fin. When the water accumulated on the lower surface of the flat tube reaches a certain level, the water will come into contact with the tip of the sharp portion, which will pierce the water surface and flow down along the sharp portion, thereby accelerating the downward flow of water on the flat tube, increasing the drainage speed on the heat exchanger, shortening the drainage time, and avoiding the problem of water being retained and frozen on the heat exchanger, which may cause the performance of the heat exchanger to deteriorate.

[0007] In some embodiments, the housing is provided with an air inlet; the side of the fin close to the air inlet is the windward side; when there is one sharp portion, the sharp portion is located below the end of the flat tube away from the windward side;

[0008] When there are a plurality of sharp portions arranged at intervals, one of the sharp portions is located below the end of the flat tube away from the windward side.

[0009] In this technical solution, the sharp portion is located below the leeward side of the flat tube, which can puncture the liquid film in time and inhibit the movement of water to the lower surface of the flat tube, thereby improving the drainage performance of the heat exchanger.

[0010] In some embodiments, the sharp portion is formed by partially opening a window in the fin body.

[0011] In this technical solution, the sharp portion is formed by a partial window opening of the fin body, which can simplify the product structure and reduce costs.

[0012] In some embodiments, the sharp portion is triangular; the side of the sharp portion close to the windward side of the fin is the first side; projected on the plate surface of the fin body, the first side is parallel to the height direction.

[0013] In this technical solution, a raised structure similar to a vortex generator is formed at the sharp part. When air blows through the triangular structure, a vortex is generated at the triangular structure. The vortex can prolong the contact time between the air and the fins, thereby enhancing heat exchange.

[0014] In some embodiments, the sharp portion is triangular; the side of the sharp portion close to the windward side of the fin is the first side; projected on the plate surface of the fin body, the first side is inclined from top to bottom away from the windward side.

[0015] In this technical solution, the first side surface can guide water toward the leeward side of the fin, thereby shortening the water drainage path and increasing the drainage rate.

[0016] In some embodiments, the sharp portion has: a first side surface, the bottom end of which is connected to the fin body; a second side surface, the bottom end of which is connected to the fin body, the top end of the second side surface and the top end of the first side surface are connected at an angle to form a pointed edge line, and the second side surface is farther away from the windward side of the fin than the first side surface; the first side surface is an outwardly convex arc surface, projected onto the plate surface of the fin body, and at least the lower part of the first side surface extends from top to bottom in a direction away from the windward side of the fin.

[0017] In this technical solution, the first side surface can guide water toward the leeward side of the fin, thereby shortening the water drainage path and increasing the drainage rate.

[0018] In some embodiments, the sharp portion has: a first side surface, the bottom end of which is connected to the fin body; a second side surface, the bottom end of which is connected to the fin body, the top end of the second side surface and the top end of the first side surface are connected at an angle to form a pointed edge line, and the second side surface is farther away from the windward side of the fin than the first side surface; the second side surface is a concave arc surface.

[0019] In this technical solution, the second side surface is an inwardly concave arc surface on the sharp portion. On the one hand, the area of ​​the sharp portion can be reduced as much as possible, reducing the impact of the sharp portion on the fin strength, wind resistance and heat conduction path; on the other hand, the inward concave second side surface can make the tip sharper, and its puncture effect on the liquid film is higher.

[0020] In some embodiments, the fin includes: a plurality of window portions connected to the fin body portion at intervals along the width direction of the fin body portion; and a sharp portion located above the window portions.

[0021] In this technical solution, after the sharp portion punctures the liquid film on the lower surface of the flat tube, the water flows downward and continues to be sucked downward by the window portion, which can speed up the drainage.

[0022] In some embodiments, the distance H from the tip to the flat tube is ≤ 2 mm.

[0023] In this technical solution, if the tip is too far away from the flat tube, the water on the flat tube needs to accumulate to a large extent before it can contact the tip and be punctured, which will weaken the effect of puncturing the water droplets through the tip and shortening the drainage time; if the tip is close to the flat tube, the water droplets on the flat tube can be punctured in time, shortening the drainage time.

[0024] On the other hand, the present application provides an air conditioner, comprising: a housing; a fan, which is arranged in the housing and is used to drive air flow; and a microchannel heat exchanger, which is used to exchange heat with the air driven by the fan, the microchannel heat exchanger comprising: flat tubes, which are used to circulate refrigerant; fins, the fins comprising: a fin body, which is provided with a flat tube groove for inserting the flat tube; at least one sharp portion, close to the bottom surface of the flat tube groove, the sharp portion is connected to the fin body at an angle, and the top of the sharp portion is a pointed end, which is used to pierce water droplets when it contacts the water droplets on the bottom surface of the flat tube.

[0025] In this technical solution, a sharp portion is provided below the flat tube groove. When the water accumulated on the lower surface of the flat tube reaches a certain level, the water will come into contact with the tip of the sharp portion, which will pierce the water surface and flow down along the sharp portion, thereby accelerating the downward flow of water on the flat tube, increasing the drainage speed on the heat exchanger, shortening the drainage time, and avoiding the problem of water being retained and frozen on the heat exchanger, which may cause the performance of the heat exchanger to deteriorate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 shows a schematic diagram of an air conditioner according to some embodiments;

[0027] Figure 2 A schematic diagram illustrating a refrigerant circuit of an air conditioner according to some embodiments is shown;

[0028] Figure 3 and Figure 4 shows a perspective view of an outdoor unit of an air conditioner according to some embodiments;

[0029] Figure 5 shows a cross-sectional view of an outdoor unit of an air conditioner according to some embodiments;

[0030] Figure 6 A perspective view of a microchannel heat exchanger for an air conditioner according to a first embodiment is shown;

[0031] Figure 7 Shown Figure 6 X-axis enlarged view;

[0032] Figure 8 A front view of a fin in a heat exchanger according to a first embodiment is shown;

[0033] Figure 9 shows a front view of a microchannel heat exchanger for an air conditioner according to a first embodiment;

[0034] Figure 10 shows a front view of a microchannel heat exchanger for an air conditioner according to a second embodiment;

[0035] Figure 11 Shown Figure 10 Y-axis enlarged view;

[0036] Figure 12 A front view of a microchannel heat exchanger for an air conditioner according to a third embodiment is shown;

[0037] Figure 13 A front view of a microchannel heat exchanger for an air conditioner according to a fourth embodiment is shown;

[0038] Figure 14 Shown Figure 13 Z-axis enlarged view;

[0039] Figure 15 A front view of a microchannel heat exchanger for an air conditioner according to a fifth embodiment is shown.

[0040] In the above figures, 100, outdoor unit; 111, compressor; 112, outdoor heat exchanger; 113, four-way valve; 114, outdoor throttling device; 115, liquid receiver; 116, outdoor fan; 200, indoor unit; 211, indoor heat exchanger; 212, indoor throttling device; 213, indoor fan;

[0041] 10. Shell; 11. Support base plate; 12. Frame column; 13. Grille plate; 14. Cover plate; 17. Air inlet; 18. Air outlet; 20. Fan; 30. Heat exchanger; 31. Flat tube; 31a. Flow hole; 32. Fin; 32a. Windward side; 320. Flat tube groove; 321. Fin body; 322. Sharp part; 323. Tip; 324. First side; 325. Second side; 326. Window; 327. Narrow gap. DETAILED DESCRIPTION

[0042] In order to make the purpose and implementation of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0043] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] <Structure of air conditioner>

[0047] Reference Figure 1 According to an embodiment of the present application, the air conditioner includes: an outdoor unit 100, located in an outdoor space, for performing heat exchange between a refrigerant and outdoor air; and an indoor unit 200, located in an indoor space, for performing heat exchange between a refrigerant and indoor air.

[0048] Figure 1 The multi-split air conditioner is used as an example for demonstration. In this embodiment, there are multiple indoor units 200. However, the air conditioner of the present application is also applicable to the case of a single indoor unit 200.

[0049] Reference Figure 2 The outdoor unit 100 includes: a compressor 111 for compressing the refrigerant; an outdoor heat exchanger 112 for performing heat exchange between the outdoor air and the refrigerant; a four-way valve 113 for selectively guiding the refrigerant compressed by the compressor 111 to the outdoor heat exchanger 112 or the indoor unit 200 according to the heating mode or the cooling mode; an outdoor throttling device 114 for decompressing the refrigerant guided to the outdoor heat exchanger 112 in the heating mode; and a liquid accumulator 115 for preventing the unevaporated liquid refrigerant from flowing to the compressor 111.

[0050] The compressor 111 compresses low-pressure gaseous refrigerant to high pressure using the rotational force of a compressor motor (not shown) when energized.

[0051] The four-way valve 113 guides the refrigerant compressed in the compressor 111 to the outdoor heat exchanger 112 in the cooling mode, and guides the refrigerant compressed in the compressor 111 to the indoor unit 200 in the heating mode.

[0052] The outdoor heat exchanger 112 condenses the refrigerant compressed by the compressor 111 in a cooling mode, and evaporates the refrigerant decompressed by the indoor unit 200 in a heating mode.

[0053] The outdoor fan 116 blows outdoor air to the outdoor heat exchanger 112 .

[0054] The outdoor throttling device 114 reduces the refrigerant pressure by throttling the refrigerant. As the refrigerant passes through a narrow passage, the refrigerant pressure decreases without exchanging heat with the outside. Specifically, the outdoor throttling device 114 may be an expansion valve or a capillary tube.

[0055] The indoor unit 200 includes an indoor heat exchanger 211 for performing heat exchange between a refrigerant and indoor air, and an indoor throttle device 212 for decompressing the refrigerant supplied to the indoor heat exchanger 211 in a cooling mode.

[0056] The indoor heat exchanger 211 evaporates the refrigerant in the cooling mode and condenses the high-pressure gas refrigerant in the heating mode.

[0057] Hereinafter, the flow of refrigerant in the air conditioner in a cooling mode or a heating mode will be described.

[0058] When the air conditioner operates in a cooling mode, the refrigerant is compressed to a high pressure by the compressor 111 of the outdoor unit 100. As the refrigerant is compressed, the pressure and temperature of the refrigerant increase.

[0059] The compressed refrigerant is guided to the outdoor heat exchanger 112 through the four-way valve 113. The refrigerant is condensed in the outdoor heat exchanger 112, and heat exchange is performed between the refrigerant and the outdoor air while the refrigerant is condensed. Specifically, the state of the refrigerant changes from gas to liquid.

[0060] After passing through the outdoor expansion device 114 , the condensed refrigerant is supplied to the indoor unit 200 .

[0061] The refrigerant supplied to the indoor unit 200 is decompressed by the indoor expansion device 212 .

[0062] The decompressed refrigerant is evaporated by the indoor heat exchanger 211, and heat exchange is performed between the refrigerant and the indoor air while the refrigerant is evaporated. Specifically, the state of the refrigerant changes to a gaseous state.

[0063] After passing through the indoor heat exchanger 211, the evaporated gaseous refrigerant is supplied to the outdoor unit 100 and is supplied to the accumulator 115 via the four-way valve 113. In the accumulator 115, the refrigerant is separated into non-evaporated liquid refrigerant and evaporated gaseous refrigerant, and the gaseous refrigerant is again supplied to the compressor 111, completing one refrigerant cycle.

[0064] As described above, in the cooling mode, the air conditioner may cool the indoor air using heat exchange between the refrigerant generated in the indoor heat exchanger 211 and the indoor air.

[0065] When the air conditioner operates in a heating mode, the refrigerant is compressed to a high pressure by the compressor 111 of the outdoor unit 100, and the temperature of the refrigerant increases with the pressure of the refrigerant.

[0066] After passing through the four-way valve 113 , the compressed refrigerant is guided to the indoor unit 200 .

[0067] The refrigerant is condensed by the indoor heat exchanger 211, and heat is exchanged between the refrigerant and the indoor air while the refrigerant is condensed. Specifically, the state of the refrigerant changes from a gaseous state to a liquid state.

[0068] After passing through the indoor heat exchanger 211 , the condensed refrigerant is supplied to the outdoor unit 100 again.

[0069] The refrigerant supplied to the outdoor unit 100 is decompressed by the outdoor expansion device 114 .

[0070] The decompressed refrigerant is evaporated by the outdoor heat exchanger 112, and heat is exchanged between the refrigerant and the outdoor air while the refrigerant is evaporated. Specifically, the state of the refrigerant changes to a gaseous state.

[0071] The gaseous refrigerant evaporated by the outdoor heat exchanger 112 is supplied to the accumulator 115 via the four-way valve 113. In the accumulator 115, the refrigerant is separated into non-evaporated liquid refrigerant and evaporated gaseous refrigerant, and the gaseous refrigerant is supplied to the compressor 111 again, completing one refrigerant cycle.

[0072] As described above, in the heating mode, the air conditioner may heat the indoor air using heat exchange between the refrigerant generated in the indoor heat exchanger 211 and the indoor air.

[0073] In this application, the outdoor heat exchanger 112 and the indoor heat exchanger 211 are also referred to as heat exchangers. The outdoor fan 116 and the indoor fan 213 are also referred to as fans.

[0074] The following is an example of the outdoor unit of the air conditioner:

[0075] Reference Figures 3 to 5 The air conditioner includes a housing 10, which is in the shape of a rectangular box.

[0076] The housing 10 is provided with an air inlet 17 for allowing air to flow into the housing 10. The housing 10 is provided with an air outlet 18 for allowing the air in the housing 10 to be discharged.

[0077] The housing 10 includes a support base 11 and frame columns 12 connected to the four corners of the support base 11. The frame columns 12 play a role in supporting the entire machine.

[0078] The side of the housing 10 is provided with a grille plate 13 connected to the frame column 12. The grille holes on the grille plate 13 form an air inlet 17.

[0079] No plate may be provided between the frame columns 12 , so that the space between the frame columns 12 forms the air inlet 17 .

[0080] A cover plate 14 connected to the frame column 12 is provided on the side of the housing 10 to cover the internal components of the housing 10.

[0081] In some embodiments, the rear side of the housing 10 lacks the cover plate 14 and the grille plate 13; the left side and the left portion of the front side of the housing 10 are provided with the grille plate 13; and the rear portion of the right side of the housing 10 is provided with the grille plate 13. Therefore, the rear side, the left side, the left portion of the front side, and the rear portion of the right side of the housing 10 form air inlets 17 for allowing air to enter the housing 10.

[0082] The right portion of the front side of the housing 10 is provided with a cover plate 14. The front portion of the right side of the housing 10 is provided with a cover plate 14, and the cover plate 14 here can be integrally formed with the grille plate 13 of its rear portion.

[0083] Components related to the refrigerant, such as the compressor 111, can be connected to the support base plate 11. The cover plate 14 can cover the compressor 30 and the like to provide protection.

[0084] The top end of the housing 10 is open to form an air outlet 18 .

[0085] The air conditioner includes a heat exchanger 30, which is disposed inside the housing 10 corresponding to the air inlet 17. The heat exchanger 30 is configured to absorb heat from the air introduced into the air inlet 17 or transfer heat to the air.

[0086] The air conditioner includes a fan 20. The fan 20 is disposed within the housing 10 corresponding to the air outlet 18 and is used to drive air flow. The fan 20 may be located between the heat exchanger 30 and the air outlet 18. The fan 20 may be an axial flow fan.

[0087] Specific reference Figure 5 , the arrows in the figure indicate the direction of air flow. When the fan 20 is working, the air can flow from the air inlet 17, through the heat exchanger 30, to the air outlet 18.

[0088] <Structure of heat exchanger>

[0089] Reference Figures 6 to 8 The heat exchanger 30 may be a microchannel heat exchanger having a plurality of flat tubes 31 and fins 32 .

[0090] The flat tubes 31 are used for circulating refrigerant. The fins 32 are connected to the flat tubes 31 to increase the surface area of ​​the flat tubes 31 to improve the heat exchange efficiency between the refrigerant and the air.

[0091] The flat tubes 31 are porous tubes with multiple flow holes 31a, which form refrigerant flow paths. The refrigerant exchanges heat with the air as it flows through each flow hole 31a in the flat tubes 31. The multiple flow holes 31a are arranged within the flat tubes 31 along the direction of air flow relative to the heat exchanger 30.

[0092] The fin 32 may be a plug-in structure. The fin 32 is provided with a flat tube groove 320 , which is adapted to the flat tube 31 and is used to install the flat tube 31 .

[0093] One transverse end of the flat tube groove 320 is open, so that the flat tube 31 can be inserted into the flat tube groove 320 from the open end.

[0094] The side of the fin 32 close to the air inlet 17 is the windward side 32a of the fin 32, and the side of the fin 32 opposite to the windward side 32a is the leeward side of the fin 32. The open end of the flat tube slot 320 is located on the windward side 32a of the fin 32.

[0095] A plurality of flat tube grooves 320 are arranged along the height direction of the fin 32 , and a flat tube 31 is inserted into each flat tube groove 320 .

[0096] Reference Figure 9 The red area in the figure represents condensate, and the large hollow arrows indicate the direction of air flow. Condensate generated during heat exchanger 30 operation drains downward under gravity. However, due to the transverse width of the flat tubes 31, some condensate accumulates on their surfaces. The drainage path from the flat tubes 31 is as follows: ① Condensate accumulates on the upper surface of the flat tubes 31 → ② Surface tension causes the condensate to flow circumferentially along the walls of the flat tubes 31 → ③ Gravity forces the condensate to flow downward. Path ② causes condensate to accumulate on the lower surface of the flat tubes 31, prolonging drainage time.

[0097] In order to reduce the retention time of condensed water on the flat tubes 31 and shorten the drainage cycle on the heat exchanger 30, the present application has made the following improvements:

[0098] Continue to refer to Figures 6 to 9 The fin 32 includes a fin body portion 321. A plurality of flat tube slots 320 are arranged on the fin body portion 321 at intervals along the height direction.

[0099] The fin 32 includes a sharp portion 322 . The sharp portion 322 is connected to the fin body 321 near the lower surface of the flat tube 31 . The top end of the sharp portion 322 is a tip 323 .

[0100] When the water accumulated on the lower surface of the flat tube 31 reaches a certain level, the water will come into contact with the tip 323 of the sharp portion 322. The tip 323 will pierce the water surface, and the water will flow down along the sharp portion 322, thereby accelerating the downward flow of water on the flat tube 31, increasing the drainage speed on the heat exchanger, and shortening the drainage time.

[0101] In the related art, the drainage method of the microchannel heat exchanger is mainly to add a water guide structure on the fin, which guides the water to the leeward side of the fin 32, thereby shortening the drainage time. Figure 9 In the process①.

[0102] This application adopts a drainage method different from the above: starting from the direction in which water is difficult to flow down the flat tube 31, a sharp portion 322 is provided on the fin, and the sharp portion 322 pierces the liquid film, destroying the surface tension of the liquid film to promote drainage.

[0103] To facilitate understanding, the working principle of this application is explained as follows: Surface tension is a property of a liquid surface that minimizes its surface area, thereby forming a thin, elastic film. When a sharp object punctures the water surface or applies pressure, this physical intervention disrupts the equilibrium state of the liquid surface, thereby destroying the surface tension.

[0104] In addition, in the embodiment of the present application, the area of ​​the sharp portion 322 is relatively small, and will not affect the strength, wind resistance and heat conduction path of the fin 32 .

[0105] In some embodiments, specific reference is made to Figure 7 The sharp portion 322 is formed by partially opening a window in the fin body 321. That is, it is formed by partially cutting and warping the fin body 321. This manufacturing method is relatively simple and has a relatively low cost.

[0106] In some embodiments, the sharp portion 322 is tilted relative to the fin body 321 , and the tip 323 is the portion of the sharp portion 322 that is farthest from the fin body 321 .

[0107] There is a distance L between the tip 323 of the sharp portion 322 and the fin body 321 to ensure that the tip 323 becomes a free end on the sharp portion 322 and can also contact the water on the lower surface of the flat tube 32 .

[0108] If L=0, the tip 323 of the sharp portion 322 is located on the fin body 321 , and the tip 323 cannot contact the water on the lower surface of the flat tube 32 .

[0109] In some embodiments, the distance H between the tip 323 and the lower surface of the flat tube 31 is ≤ 2 mm. If the distance between the tip 323 and the lower surface of the flat tube 31 is too far, the tip 323 can only contact the liquid film when sufficient water accumulates on the lower surface of the flat tube 31, which will weaken the effect of the sharp portion 322 in improving drainage performance.

[0110] In some embodiments, the sharp portion 322 is in the shape of a sheet and includes a first side surface 324 and a second side surface 325. The top ends of the first side surface 324 and the second side surface 325 are connected at an angle to form a ridgeline of the tip 323. The bottom end of the first side surface 324 is connected to the fin body 321, and the bottom end of the second side surface 325 is connected to the fin body 32.

[0111] The first side surface 324 and the second side surface 325 are planes, and the sharp portion 322 is triangular.

[0112] In some embodiments, reference Figure 10 and Figure 11The first side surface 324 is closer to the windward side than the second side surface 325. When projected onto the plate surface of the fin body 321, the first side surface 324 is parallel to the height direction, or the angle between the first side surface 324 and the height direction is ≤10°.

[0113] In this structural form, a protruding structure similar to a vortex generator is formed at the sharp portion 322. When air blows through the triangular structure, a vortex is generated at the triangular structure. The vortex can prolong the contact time between the air and the fin 32, thereby enhancing heat exchange.

[0114] In some embodiments, reference Figure 12 The first side surface 324 is closer to the windward side than the second side surface 325. Projected onto the surface of the fin body 321, the first side surface 324 slopes downward, away from the windward side 32a. This allows the first side surface 324 to direct water toward the leeward side of the fin 32, shortening the water drainage path, increasing drainage speed, and reducing drainage time.

[0115] For ease of understanding, the two flat tubes 32 above and below the sharp portion 322 are respectively the flat tube 311 and the flat tube 312 .

[0116] A plane passing through the bottom end of the first side surface 324 and perpendicular to the width direction of the fin 32 is a plane P. The plane P intersects the upper surface of the flat tube 312 at a line m.

[0117] After the water on the flat tube 31 is punctured by the tip 323 of the sharp portion 322, part of the water will flow downward along the first side surface 324 to the flat tube 312. Then, regardless of the influence of wind force, the water will continue to flow from m to the leeward side along the upper surface of the flat tube 312 ( Figure 12 The center line arrows indicate the flow path of water in the flat tubes 312).

[0118] In the present application, the first side surface 324 is inclined from top to bottom in a direction away from the windward side 32a, so that the line m is closer to the leeward side, which can shorten the flow path of water on the flat tube 312, thereby shortening the flow time of water on the flat tube 31 and improving drainage efficiency.

[0119] In other embodiments, referring to Figure 13 and Figure 14 The first side surface 324 is closer to the windward side than the second side surface 325 , and the first side surface 324 is an arc surface protruding outward from the sharp portion 322 .

[0120] Assuming that the plane passing through the top and bottom ends of the first side surface 324 is an imaginary reference plane S, the first side surface 324 is in a convex outward state relative to the imaginary reference plane S. Therefore, the first side surface 324 is called the outward convex arc surface on the sharp portion 322.

[0121] The point on the first side surface 324 closest to the windward side 32a is point a, and the surface passing through point a and perpendicular to the width direction of the fin 32 is surface T. At least the lower portion of the first side surface 324 is located on the side of surface T away from the windward side 32a.

[0122] With this arrangement, when projected onto the surface of the fin body 321, at least the lower portion of the first side surface 324 extends downwardly, away from the windward side 32a. After the tip 323 of the sharp portion 322 pierces the liquid film, water flows downward along the first side surface 324. The first side surface 324 can guide the water flow toward the leeward side of the fin 32, thereby allowing the water to flow to the leeward side of the fin 32 more quickly and shortening the drainage time.

[0123] In some embodiments, the first side surface 324 is closer to the windward side than the second side surface 325, and the first side surface 324 is an outwardly convex curved surface on the sharp portion 322. The point on the first side surface 324 closest to the windward side 32a is located at the top of the first side surface 324. This allows the bottom end of the first side surface 324 to be closer to the leeward side, thereby improving drainage efficiency.

[0124] In some other embodiments, the first side surface 324 is closer to the windward side than the second side surface 325 , and the second side surface 325 is an inwardly concave arc surface on the sharp portion 322 .

[0125] Assuming that the plane passing through the top and bottom ends of the second side surface 325 is an imaginary reference plane Q, the second side surface 325 is concave relative to the imaginary reference plane Q. Therefore, the second side surface 325 is called the inwardly concave arc surface on the sharp portion 322.

[0126] Since the second side surface 325 is recessed inwardly, on the one hand, the area of ​​the sharp portion 322 can be reduced as much as possible, thereby reducing the influence of the sharp portion 322 on the fin strength, wind resistance and heat conduction path; on the other hand, the second side surface 325 is recessed inwardly, which can make the tip 323 sharper, and has a higher effect on puncturing the liquid film.

[0127] The space between the second side surface 325 and the surface Q is the area where the sharp portion 322 is reduced.

[0128] The angle between surface Q and the first side surface 324 is α1, the angle between the second side surface 325 and the first side surface 324 is α2, the second side surface 325 is located between surface Q and the first side surface 324, α2 is smaller than α1, therefore, the second side surface 325 is concave inwardly compared to when the second side surface 325 is flat, which can make the tip 323 sharper.

[0129] In some embodiments, the sharp portion 322 has one sharp portion 322 , and the sharp portion 322 is located below the leeward end of the flat tube 31 .

[0130] Since most of the water on the upper surface of the flat tube 31 flows to the lower surface of the flat tube 31 through the leeward end of the flat tube 31, the sharp portion 322 is arranged below the leeward end of the flat tube 31 to puncture the liquid film in time, thereby inhibiting the movement of water to the lower surface of the flat tube 31, thereby improving the drainage performance of the heat exchanger.

[0131] In some embodiments, there are multiple sharp portions 322 , which are spaced apart below the flat tube 31 along the width direction of the fin 32 . One of the sharp portions 322 is located below the leeward end of the flat tube 31 .

[0132] In some embodiments, reference Figure 15 The fin 32 includes a window portion 326 , which is connected to the fin body 321 and is located between two upper and lower adjacent flat tube slots 320 .

[0133] The narrow gaps 327 between the window portions 326 are similar to capillary structures, and the capillary action can be used to accelerate the absorption of water below the flat tubes 31, thereby improving the drainage performance.

[0134] The sharp portion 322 is located above the window portion 326. After the sharp portion 322 punctures the liquid film on the lower surface of the flat tube 31, water flows downward and continues to be sucked downward by the window portion 326, which can speed up drainage.

[0135] According to an embodiment of the present application, the bottom end of the first side surface 324 of the sharp portion 326 corresponds to the top of the narrow gap 327 formed by the window portion 326 , and the capillary action of the window portion 326 can be used to absorb water at the bottom end of the first side surface 324 .

[0136] According to an embodiment of the present application, the bottom end of the second side surface 325 of the sharp portion 326 corresponds to the top of the narrow gap 327 formed by the window portion 326, and the capillary action of the window portion 326 can be used to absorb water at the bottom end of the second side surface 325.

[0137] As can be seen from the above, according to the air conditioner of the embodiment of the present application, by providing a sharp portion 322 below the flat tube 31 on the fin 32, when the water accumulated on the lower surface of the flat tube 31 reaches a certain level, the water will come into contact with the tip 323 of the sharp portion 322, and the tip 323 will pierce the water surface, and the water will flow down along the sharp portion 322, thereby accelerating the downward flow of water on the flat tube 31, increasing the drainage speed on the heat exchanger, and shortening the drainage time.

[0138] In addition, the area of ​​the sharp portion 322 is relatively small and will not affect the strength, wind resistance and heat conduction path of the fin 32 .

[0139] In addition, the sharp portion 322 is provided below the leeward end of the flat tube 31 , which can promptly puncture the liquid film and inhibit the movement of water to the lower surface of the flat tube 31 , thereby improving the drainage performance of the heat exchanger.

[0140] Furthermore, the sharp portion 322 is triangular in shape, comprising a first side 324 and a second side 325. The first side 324 is closer to the windward side than the second side 325. Projected onto the surface of the fin body 321, the first side 324 is parallel to the height direction, or the angle between the first side 324 and the height direction is ≤10°. With this structure, the sharp portion 322 forms a raised structure similar to a vortex generator. When air blows over the triangular structure, it generates vortices, which prolong the contact time between the air and the fin 32, thereby enhancing heat exchange.

[0141] In addition, the first side surface 324 is inclined from top to bottom in a direction away from the windward side 32a. In this way, the first side surface 324 can guide water to the leeward side of the fin 32, thereby shortening the water drainage path and increasing the drainage rate.

[0142] Furthermore, the first side surface 324 is an outwardly convex curved surface on the sharp portion 322. At least the lower portion of the first side surface 324 extends downwardly away from the windward side 32a. After the tip 323 of the sharp portion 322 pierces the liquid film, water flows downward along the first side surface 324. The first side surface 324 can guide the water flow toward the leeward side of the fin 32, thereby allowing the water to flow to the leeward side of the fin 32 more quickly and shortening the drainage time.

[0143] In addition, the second side surface 325 is an inwardly concave arc surface on the sharp portion 322. On the one hand, it can reduce the area of ​​the sharp portion 322 as much as possible, reducing the impact of the sharp portion 322 on the fin strength, wind resistance and heat conduction path; on the other hand, the inward concavity of the second side surface 325 can make the tip 323 sharper, and its puncturing effect on the liquid film is higher.

[0144] Furthermore, the window portion 326 is connected to the fin body 321 and is located between two adjacent flat tube slots 320. The sharp portion 322 is located above the window portion 326. After the sharp portion 322 punctures the liquid film on the lower surface of the flat tube 31, water flows downward and is further sucked downward by the window portion 326, which can accelerate drainage.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0146] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioner, characterized in that: include: case; a fan, disposed in the housing and configured to drive air flow; as well as A microchannel heat exchanger, configured to exchange heat with the air driven by the fan, the microchannel heat exchanger comprising: Flat tubes, used to circulate refrigerant; The fin comprises: a fin body, on which the flat tube is plugged; At least one sharp portion is connected to the fin body, the sharp portion is close to the lower surface of the flat tube, and the top of the sharp portion is a pointed end, which is used to pierce water droplets when contacting the water droplets on the lower surface of the flat tube.

2. The air conditioner according to claim 1, characterized in that The shell is provided with an air inlet; the side of the fin close to the air inlet is the windward side; When there is one sharp portion, the sharp portion is located below the end of the flat tube away from the windward side; Alternatively, when there are a plurality of sharp portions arranged at intervals, one of the sharp portions is located below an end of the flat tube away from the windward side.

3. The air conditioner according to claim 1, characterized in that The sharp portion is formed by partially opening a window in the fin body.

4. The air conditioner according to claim 1, wherein: The sharp portion is triangular in shape; The side surface of the sharp portion close to the windward side of the fin is the first side surface; when projected onto the plate surface of the fin body, the first side surface is parallel to the height direction.

5. The air conditioner according to claim 1, characterized in that The sharp portion is triangular in shape; The side surface of the sharp portion close to the windward side of the fin is the first side surface; when projected onto the plate surface of the fin body, the first side surface is inclined from top to bottom toward a direction away from the windward side.

6. The air conditioner according to claim 1, characterized in that The sharp portion has: a first side surface, the bottom end of which is connected to the fin body; a second side surface, the bottom end of which is connected to the fin body, the top end of which is connected to the top end of the first side surface at an angle to form a ridge line of the tip, and the second side surface is farther away from the windward side of the fin than the first side surface; The first side surface is an outwardly convex arc surface, which is projected onto the plate surface of the fin body, and at least the lower portion of the first side surface extends from top to bottom in a direction away from the windward side of the fin.

7. The air conditioner according to claim 1, wherein: The sharp portion has: a first side surface, the bottom end of which is connected to the fin body; The second side surface has a bottom end connected to the fin body, and the top end of the second side surface is connected to the top end of the first side surface at an angle to form the ridge line of the tip, and the second side surface is farther away from the windward side of the fin than the first side surface; the second side surface is a concave arc surface.

8. The air conditioner according to claim 1, wherein: The fin comprises: A plurality of window portions are connected to the fin body portion at intervals along the width direction of the fin body portion; The sharp portion is located above the window portion.

9. The air conditioner according to claim 1, wherein: The distance H from the tip to the flat tube located at an adjacent position above the tip is ≤ 2 mm.

10. An air conditioner, characterized in that: include: case; a fan, disposed in the housing and configured to drive air flow; as well as A microchannel heat exchanger, configured to exchange heat with the air driven by the fan, the microchannel heat exchanger comprising: Flat tubes, used to circulate refrigerant; The fin comprises: The fin body is provided with a flat tube groove for inserting the flat tube; At least one sharp portion is close to the bottom surface of the flat tube groove, the sharp portion is connected to the fin body at an angle, and the top of the sharp portion is a tip, which is used to pierce water droplets when contacting the water droplets on the bottom surface of the flat tube.

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