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; the heat exchanger is used for exchanging heat with air driven by the fan, the heat exchanger comprises a flat pipe, the flat pipe comprises a plurality of flat pipe sections with the thicknesses gradually decreased in a stepped mode from the windward side to the leeward side of the heat exchanger, and each flat pipe section comprises a first flat pipe section with the thickness being Htm, a second flat pipe section with the thickness being Htm and a third flat pipe section with the thickness being Htm; the thickness of the second flat pipe section is Htn; the fins are provided with inserting grooves, each inserting groove comprises a plurality of inserting groove sections, each inserting groove section comprises a first inserting groove section and a second inserting groove section, each first inserting groove section is matched with the corresponding first flat pipe section, and the groove height of each first inserting groove section is Hfm; the second slot section is matched with the second flat tube section, and the slot height of the second slot section is Hfn; hfm-Htm is greater than or equal to 0, and Hfn-Htn is less than or equal to 0; or Hfm-Htm is smaller than or equal to 0, and Hfn-Htn is larger than or equal to 0. According to the air conditioner, assembly gaps with different sizes between the flat pipes and the fins can be avoided.

Description

TECHNICAL FIELD

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

[0002] Some air conditioners use micro-channel heat exchangers. The fins of the inserted micro-channel heat exchanger are provided with insertion grooves, and the flat tubes are inserted into the insertion grooves.

[0003] In order to ensure that the flat tube and the insertion groove can be welded together, the gap between the insertion groove and the flat tube needs to be set relatively small, and even can be a negative gap fit. When the flat tube is pressed into the fin insertion groove, the flat tube is easy to rebound after contacting the bottom of the insertion groove, thereby causing the assembly gap between the flat tube and the fin to be of different sizes. Such a fit defect can cause poor welding, poor local heat exchange of the heat exchanger, and other problems. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an air conditioner, which can avoid the assembly gap of different sizes between the flat tube and the fin.

[0005] In one aspect of the present application, an air conditioner comprises: a shell; a fan arranged in the shell; a heat exchanger for exchanging heat with air driven by the fan, the heat exchanger comprising: a flat tube, the flat tube comprising: a first flat tube section, the thickness of the first flat tube section being Htm; a second flat tube section, the second flat tube section being arranged along the width direction of the flat tube with the first flat tube section, the thickness of the second flat tube section being Htn; a fin, the fin being provided with an insertion groove, the insertion groove comprising: a first insertion groove section, the first insertion groove section being fitted with the first flat tube section, the groove height of the first insertion groove section being Hfm; a second insertion groove section, the second insertion groove section being fitted with the second flat tube section, the groove height of the second insertion groove section being Hfn; Hfm-Htm≥0, Hfn-Htn≤0; or Hfm-Htm≤0, Hfn-Htn≥0.

[0006] In the technical solution, the thickness Htm of the first flat tube section is not greater than the groove height Hfm of the first insertion groove section, and the thickness Htn of the second flat tube section is not less than the groove height Hfn of the second insertion groove section; or the thickness Htm of the first flat tube section is not less than the groove height Hfm of the first insertion groove section, and the thickness Htn of the second flat tube section is not greater than the groove height Hfn of the second insertion groove section, so that a part of the fit between the flat tube and the fin is a non-negative gap, and a part of the fit is a non-positive gap. In this way, the length of the flat tube and the fin in the negative gap fit can be reduced, thereby reducing the resistance of the flat tube inserted into the fin, and further reducing the rebound of the flat tube after being inserted into the fin, and thus reducing the assembly gap of the flat tube and the fin at the groove bottom.

[0007] In another aspect of the present application, an air conditioner comprises: a flat tube, from the windward side to the leeward side of the heat exchanger, the flat tube comprising a plurality of flat tube sections with thicknesses decreasing in a stepped manner; the first flat tube section and the second flat tube section are any two flat tube sections.

[0008] In the technical solution, the flat tube is arranged as multiple flat tube sections in a stepped manner, a part of the flat tube sections are in non-positive clearance fit with the fins, and the other part of the flat tube sections are in non-negative clearance fit with the fins, the frictional resistance in the assembly process can be greatly reduced by adjusting the size of each flat tube section, thereby reducing the rebound of the flat tube after being inserted into the fins.

[0009] In addition, the flat tube sections decrease in a stepped manner from the windward side to the leeward side of the heat exchanger, which is beneficial to the flow of condensate water / defrosting water on the flat tube to the leeward side, and improves the drainage efficiency of the heat exchanger.

[0010] In some embodiments, the first flat tube section and the second flat tube section are any two adjacent flat tube sections in the multiple flat tube sections.

[0011] In the technical solution, the fit between the flat tube sections and the fins is alternately distributed between the non-positive clearance and the non-negative clearance along the width direction of the flat tube, and the frictional resistance of the flat tube inserted into the fins can be greatly reduced.

[0012] In some embodiments, the fin is provided with a folded edge portion folded in the thickness direction thereof, the folded edge portion is arranged on the peripheral portion of the insertion slot, the folded edge height of the folded edge portion in the thickness direction of the fin is Hj, and Hj gradually decreases from the slot opening to the slot bottom of the insertion slot.

[0013] In the technical solution, Hj decreases, which can reduce the contact area of the folded edge portion and the flat tube, thereby reducing the frictional resistance in the assembly.

[0014] In some embodiments, the two ends of the flat tube in the width direction are in a circular arc shape, a plane passing through the center of the circular arc and being orthogonal to the height direction of the heat exchanger is plane P, and the flat tube is symmetrical relative to plane P.

[0015] In some embodiments, the thickness of the first flat tube section is greater than the thickness of the second flat tube section, and the hole height of the flow-through hole in the first flat tube section is greater than the hole height of the flow-through hole in the second flat tube section.

[0016] In the technical solution, the hole height of the flow-through hole in the first flat tube section is greater than the hole height of the flow-through hole in the second flat tube section, which can make the refrigerant flow more near the windward side in the flat tube, thereby adapting to the energy of the air in the windward direction, and making the heat exchange efficiency of the heat exchanger higher.

[0017] In some embodiments, the outer side surfaces of the two adjacent flat tube sections are connected by a bevel.

[0018] In the technical solution, the bevel is beneficial to the assembly of the flat tube to the fin.

[0019] In some embodiments, a notch portion is arranged on the insertion slot near the slot opening thereof, and a bulge portion is arranged on the flat tube and matched with the notch portion.

[0020] In the technical solution, the positioning structure with the notch part and the bulge part between the flat tube and the slot can realize self-locking function after the flat tube is inserted into the fin, avoid rebound of the flat tube, and eliminate assembly gap between the flat tube and the fin.

[0021] In addition, the bulge part and the notch part are close to the slot, which can avoid blocking of the bulge part to condensate water / demisting water on the flat tube.

[0022] In some embodiments, the thickness of the flat tube segment close to the slot of the slot is not greater than the slot height of the slot segment matched therewith.

[0023] In the technical solution, the non-negative gap cooperation between the flat tube segment where the bulge part is located and the fin can reduce friction resistance during assembly.

[0024] In some embodiments, the size of the notch part in the width direction of the flat tube is greater than the size of the notch part in the height direction.

[0025] In the technical solution, the size of the notch part in the height direction is small, which can reduce the difficulty of the bulge part being clamped into the notch part. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic diagram of an outdoor unit in an air conditioner according to some embodiments is shown;

[0027] Figure 2 A top view of an internal structure of an outdoor unit in an air conditioner according to some embodiments is shown;

[0028] Figure 3 A sectional view of an outdoor unit in an air conditioner according to some other embodiments is shown;

[0029] Figure 4 A side view of a heat exchanger in an air conditioner according to some embodiments is shown;

[0030] Figure 5 A side view of a heat exchanger in an air conditioner according to some embodiments is shown;

[0031] Figure 6 An exploded view of a heat exchanger in an air conditioner according to some embodiments is shown;

[0032] Figure 7 A side view of a flat tube in an air conditioner according to some embodiments is shown;

[0033] Figure 8 A side view of a flat tube in an air conditioner according to some embodiments is shown;

[0034] Figure 9 A Figure 8 enlarged view of A in FIG. 8 is shown;

[0035] Figure 10 A side view of a fin in an air conditioner is shown according to some embodiments;

[0036] Figure 11 A side view of a fin in an air conditioner is shown according to some embodiments; Figure 10 A zoomed-in view of B in the above figure;

[0037] Figure 12 A top view of a fin in an air conditioner is shown according to some embodiments.

[0038] In the above figures, 100, outdoor unit; 10, shell; 11, bottom plate; 12, top plate; 13, side plate; 14, air inlet; 15, air outlet; 20, fan; 30, heat exchanger; 31, flat tube; 31a, flow-through hole; 311, first flat tube side wall; 312, second flat tube side wall; 313, first circular arc side wall; 314, second circular arc side wall; 315, bulge; 3151, first bulge side; 3152, second bulge side; 3153, third bulge side; 3261, first flat tube segment; 3262, second flat tube segment; 32, fin; 320, slot; 3201, first slot segment; 3202, second slot segment; 321, notch; 322, slot bottom; 323, flange portion; 324, notch portion; 3241, first notch side; 3242, second notch side; 3243, third notch side. DETAILED DESCRIPTION

[0039] For the purpose of clarity and a complete understanding of the present application, the exemplary embodiments of the present application will be described in conjunction with the drawings, which are by way of illustration and not by way of limitation. It is apparent that the following description includes exemplary embodiments only and is not meant to limit the present application.

[0040] In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are terms of reference and are used only for the purpose of assisting in description of the present application and are not to be construed as limiting the present application to any particular position or orientation. There is no suggestion that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore, it is not to be construed as limiting the present application.

[0041] The terms "first", "second", etc., are used only for the purpose of description and are not to be construed as indicating or implying relative importance or a specific number of the technical features indicated thereby. Thus, the features defined with "first", "second", etc., can include one or more of the features explicitly or implicitly. In the description of the present application, "a plurality of" means two or more, unless otherwise specified.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been adjusted and heat exchanged.

[0044] The compressor compresses the refrigerant gas in a low-temperature and low-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0045] The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by exchanging heat with a material to be cooled using the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0046] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger, the indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0047] The indoor heat exchanger and the outdoor heat exchanger are used as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

[0048] When the outdoor unit and the indoor unit of the air conditioner are of a split structure, the outdoor unit is also called an outdoor unit, and the indoor unit is also called an indoor unit.

[0049] Referring to Figure 1 and Figure 2 , the air conditioner according to the embodiment of the present application includes an outdoor unit 100 located in an outdoor space for performing heat exchange between a refrigerant and outdoor air, and an indoor unit located in an indoor space for performing heat exchange between a refrigerant and indoor air.

[0050] The following is an example of an outdoor unit in an air conditioner:

[0051] The air conditioner comprises a housing 10 in the shape of a cuboid box.

[0052] The housing 10 comprises a bottom plate 11 constituting a bottom structure, a top plate 12 constituting a top structure, and side plates 13 connected between the bottom plate 11 and the top plate 12.

[0053] In the side plates 13 of the housing 10, an air inlet 14 can be provided on the rear side plate and the left side plate for air to flow into the housing 10, and an air outlet 15 can be provided on the front side plate for air in the housing 10 to flow out.

[0054] The air conditioner comprises a fan 20 arranged in the housing 10 corresponding to the air outlet 15, which is used to drive air flow. The fan 20 can be an axial fan.

[0055] The air conditioner comprises a heat exchanger 30 arranged in the housing 10 corresponding to the air inlet 14. The heat exchanger 30 is used to absorb heat from or transfer heat to the air introduced into the air inlet 14.

[0056] Figure 2 The arrows in the figure indicate the direction of air flow. When the fan 20 is working, air can enter the housing 10 from the air inlet 14, flow to the air outlet 15 after heat exchange by the heat exchanger 30, and then flow out of the housing 10.

[0057] The above is a description taking a side air outlet outdoor unit as an example. However, the embodiments of the present application are also applicable to a top air outlet outdoor unit.

[0058] Referring to Figure 3 , the arrows in the figure indicate the direction of air flow. When the outdoor unit is a top air outlet type, the housing 10 comprises a bottom plate 11 constituting a bottom structure, and side plates 13 connected to the bottom plate 11.

[0059] The air inlet 14 is provided on the side plates 13 of the housing 10. The air outlet 15 is provided on the top of the housing 10. The heat exchanger 30 is arranged below the fan 20.

[0060] Referring to Figure 4 , the heat exchanger 30 can be a micro-channel heat exchanger. The micro-channel heat exchanger has a plurality of flat tubes 31 and fins 32.

[0061] The flat tube 31 is used for the circulation of refrigerant; the fin 32 is connected to the flat tube 31, and the surface area of the flat tube 31 is increased to improve the heat exchange efficiency between the refrigerant and the air.

[0062] The flat tube 31 is a porous tube having a plurality of flow-through holes 31a that form refrigerant flow paths. The refrigerant exchanges heat with air as it flows through each flow-through hole 31a of the flat tube 31. The plurality of flow-through holes 31a are arranged in the flat tube 31 in the direction of air flow relative to the heat exchanger 30.

[0063] The fin 32 can be a tab structure. The fin 32 is provided with a tab slot 320 that is fitted to the flat tube 31 for mounting the flat tube 31.

[0064] One end of the tab slot 320 in the lateral direction is open to form a slot opening 321 to facilitate insertion of the flat tube 31 into the tab slot 320 from the slot opening 321.

[0065] A plurality of tab slots 320 are arranged in the height direction on the fin 32, and the flat tube 31 is inserted into each tab slot 320.

[0066] In some embodiments, Figure 4 The hollow arrowhead indicates the insertion direction of the flat tube into the fin, and the direction of air flow.

[0067] The side of the heat exchanger 30 that is close to the air inlet 14 is the windward side, and the side of the heat exchanger 30 that is opposite the windward side is the leeward side.

[0068] The slot opening 321 of the tab slot 320 is located on the windward side of the fin 32. The insertion direction of the flat tube 31 into the tab slot 320 is from the windward side to the leeward side.

[0069] In some embodiments, after the flat tube 31 is inserted into the tab slot 320, the flat tube 31 and the fin 32 are fused together by welding.

[0070] The fit clearance between the flat tube 31 and the fin 32 can be controlled to be within ±0.05 mm. When the thickness Ht of the flat tube 31 is not less than the slot height Hf of the tab slot 320, an external force is required to press the flat tube 31 into the tab slot 320 of the fin 32 during assembly.

[0071] It should be noted that the slot height Hf of the tab slot 320 is the dimension of the tab slot 320 in the height direction.

[0072] As the width of the flat tube 31 increases, the resistance of the flat tube 31 to insertion into the fin 32 under a negative fit clearance increases, the rebound force of the flat tube 31 after insertion into the fin 32 increases, and the fit clearance between the slot bottom 322 and the fin 32 of the flat tube 31 increases.

[0073] This assembly defect can cause poor contact between the flat tube 31 and the fin 32, thereby affecting the heat exchange of the heat exchanger 30.

[0074] This assembly clearance can cause poor local heat exchange performance of the heat exchanger 30, thereby causing the problem of rapid frosting under frosting conditions.

[0075] The assembly gap can cause the equivalent width of the flat tube 31 to increase, thereby hindering the drainage efficiency of the flat tube 31, deteriorating the corrosion resistance, and the like. Here, the equivalent width = the width of the flat tube 31 + the assembly gap.

[0076] The greater the resistance of the flat tube 31 to be inserted into the slot 320 of the fin 32, the greater the rebound force of the flat tube 31, resulting in the greater gap between the flat tube 31 and the fin 32 at the groove bottom 322.

[0077] In some embodiments, referring to Figure 5 and Figure 6 , along the width direction of the flat tube 31, the flat tube 31 can include a first flat tube segment 3261 and a second flat tube segment 3262 arranged along the width direction thereof.

[0078] The thickness of the first flat tube segment 3261 is Htm, and the thickness of the second flat tube segment 3262 is Htn.

[0079] The slot 320 includes a first slot segment 3201. The first slot segment 3201 cooperates with the first flat tube segment 3261. The groove height of the first slot segment 3201 is Hfm.

[0080] The slot 320 includes a second slot segment 3202. The second slot segment 3202 cooperates with the second flat tube segment 3262. The groove height of the second slot segment 3202 is Hfn.

[0081] Hfm-Htm≥0, Hfn-Htn≤0; or, Hfm-Htm≤0, Hfn-Htn≥0.

[0082] That is, because Hfm-Htm≥0 or Hfn-Htn≥0, the cooperation between the flat tube 31 and a portion of the fin 32 is non-negative gap cooperation; because Hfn-Htn≤0 or Hfm-Htm≤0, the cooperation between the flat tube 31 and a portion of the fin 32 is non-positive gap cooperation. In this way, the length of the flat tube 31 under the negative gap cooperation with the fin 32 can be reduced, thereby reducing the frictional resistance of the flat tube 31 to be inserted into the fin 32, and further reducing the rebound of the flat tube 31 after being inserted into the fin 32, and thus reducing the assembly gap between the flat tube 31 and the fin 32 at the groove bottom 322.

[0083] In some embodiments, along the width direction of the flat tube 31, from one end of the width direction of the flat tube 31 to the other end of the width direction of the flat tube 31, the thickness Ht of the flat tube 31 decreases in a stepped manner.

[0084] The slot 320 has a shape adapted to the outer shape of the flat tube 31. The slot 320 is generally U-shaped, and the opening end of the U-shape is the slot opening 321 of the slot 320. The bottom of the U-shape is the groove bottom 322 of the slot 320.

[0085] The slot height Hf of the slot 320 decreases in a stepped manner from the slot opening 321 to the slot bottom 322.

[0086] In the present application, the flat tube 31 is provided with a stepped shape, and the size of each flat tube segment 326 is relatively easy to process, thereby improving the processing efficiency of the flat tube 31.

[0087] In some embodiments, the flat tube 31 includes a plurality of flat tube segments in a stepped manner, and the slot 320 includes a plurality of slot segments matched with the flat tube segments.

[0088] The first flat tube segment 3261 and the second flat tube segment 3262 are any two of the plurality of flat tube segments.

[0089] In some embodiments, the first flat tube segment 3261 and the second flat tube segment 3262 are any two adjacent flat tube segments. In this way, the matching of the flat tube segments and the slot segments is arranged alternately between the non-negative gap and the non-positive gap.

[0090] In some embodiments, starting from the flat tube segment close to the slot opening 321, the thickness of the flat tube segment at an odd position is not greater than the slot height of the slot segment matched therewith, and the thickness of the flat tube segment at an even position is not less than the slot height of the slot segment matched therewith; or the thickness of the flat tube segment at an odd position is not less than the slot height of the slot segment matched therewith, and the thickness of the flat tube segment at an even position is not greater than the slot height of the slot segment matched therewith.

[0091] The present application can greatly reduce the frictional resistance in the assembly process by adjusting the size of the odd and even flat tube segments, thereby reducing the rebound of the flat tube after being inserted into the fin.

[0092] According to the embodiments of the present application, the plurality of flat tube segments includes a first flat tube segment, a second flat tube segment,..., and an i-th flat tube segment arranged in sequence from the slot opening 321 side to the slot bottom 322 side.

[0093] The thickness of the first flat tube segment is Ht1, the thickness of the second flat tube segment is Ht2, and the thickness of the i-th flat tube segment is Hti.

[0094] The slot 320 includes a first slot segment, a second slot segment,..., and an i-th slot segment. The first slot segment is matched with the first flat tube segment. The second slot segment is matched with the second flat tube segment. The i-th slot segment is matched with the i-th flat tube.

[0095] The slot height of the first slot segment is Hf1, the slot height of the second slot segment is Hf2, and the slot height of the i-th slot segment is Hfi.

[0096] Hf1-Ht1≥0, Hf2-Ht2≤0, Hf3-Ht3≥0, Hf4-Ht4≤0; or Hf1-Ht1≤0, Hf2-Ht2≥0, Hf3-Ht3≤0, Hf4-Ht4≥0.

[0097] Hf1-Ht1≥0, Hf2-Ht2≤0, Hf3-Ht3≥0, Hf4-Ht4≤0; or Hf1-Ht1≤0, Hf2-Ht2≥0, Hf3-Ht3≤0, Hf4-Ht4≥0.

[0098] Exemplarily, referring to Figure 7 and Figure 10 , i=4. The plurality of flat tube segments include a first flat tube segment, a second flat tube segment, a third flat tube segment and a fourth flat tube segment arranged in sequence from the side of the slot 321 to the side of the slot bottom 322.

[0099] Hf1-Ht1≥0, Hf2-Ht2≤0, Hf3-Ht3≥0, Hf4-Ht4≤0; or Hf1-Ht1≤0, Hf2-Ht2≥0, Hf3-Ht3≤0, Hf4-Ht4≥0.

[0100] In some embodiments, referring to Figure 8 , the flat tube 31 is oblong circular. The flat tube 31 includes a first flat tube side wall 311 and a second flat tube side wall 312. The first flat tube side wall 311 and the second flat tube side wall 312 are oppositely arranged.

[0101] The two ends of the first flat tube side wall 311 and the second flat tube side wall 312 in the transverse direction are connected by a first circular arc side wall 313 and a second circular arc side wall 314 respectively.

[0102] The first circular arc side wall 313 is located at one end of the flat tube 31 close to the slot 321, and the second circular arc side wall 314 is located at one end of the flat tube 31 away from the slot 321.

[0103] The first flat tube side wall 311, the second flat tube side wall 312, the first circular arc side wall 313 and the second circular arc side wall 314 enclose a cavity. A plurality of partition walls are connected in the cavity, so as to divide the cavity into a plurality of flow-through holes 31a.

[0104] The arrangement direction of the first circular arc side wall 313 and the second circular arc side wall 314 is the width direction of the flat tube 31.

[0105] In some embodiments, the plane passing through the centers of the first circular arc side wall 313 and the second circular arc side wall 314 and orthogonal to the height direction is the plane P, and the flat tube 31 is symmetrical relative to the plane P. That is, both the upper and lower sides of the flat tube 31 are in a stepped shape.

[0106] In some embodiments, the upper side of two adjacent flat tube segments is connected by a slope.

[0107] In other embodiments, the upper side of the flat tube 31 is stepped, and the lower side of the flat tube 31 is in the same plane.

[0108] In this application, because the flat tube 31 is stepped from the windward side to the leeward side (i.e. from the groove 321 side to the groove bottom 322 side), the condensate water or defrosting water on the upper surface of the flat tube 31 can flow to the lower part, thereby flowing to the leeward side of the fin 32, which is beneficial to the water discharge on the flat tube 31 and improves the water discharge efficiency of the heat exchanger 30.

[0109] In some embodiments, referring to Figure 5 , the fin 32 is provided with a folded edge portion 323 folded in the thickness direction thereof. The folded edge portion 323 is arranged around the periphery of the insertion groove 320. The space surrounded by the folded edge portion 323 forms the insertion groove 320.

[0110] The folded edge portion 323 can reduce the contact thermal resistance between the flat tube 31 and the fin 32.

[0111] In some embodiments, in combination Figure 12 , the folded height of the folded edge portion 323 in the thickness direction of the fin 32 is denoted as Hj; Hj gradually decreases from the groove opening 321 of the insertion groove 320 to the groove bottom 322 of the insertion groove 320. In this way, the contact area between the folded edge portion 323 and the flat tube 31 can be reduced, thereby further reducing the frictional resistance when the flat tube 31 is inserted into the fin 32.

[0112] In some embodiments, the thickness of the first flat tube segment 3261 is greater than the thickness of the second flat tube segment 3262, and the hole height of the flow-through hole 31a in the first flat tube segment 3261 is greater than the hole height of the flow-through hole 31a in the second flat tube segment 3262.

[0113] When the air flows from the windward side to the leeward side of the heat exchanger 30, the temperature of the air gradually decreases (when the heat exchanger is an evaporator), the flow-through hole 31a near the windward side of the flat tube 31 has a larger hole height, and the flow rate of the refrigerant flowing through the flow-through hole 31a is larger, which can make the flow rate of the refrigerant in the flat tube 31 near the windward side larger, thereby adapting to the energy of the air in the windward direction, and making the heat exchange efficiency of the heat exchanger 30 higher.

[0114] In some embodiments, referring to Figure 8 to Figure 11 , a positioning structure of the notch portion 324 and the bulging portion 315 is arranged between the flat tube 31 and the insertion groove 320. The positioning structure can realize the self-locking function of the flat tube 31 after being inserted into the fin 32, avoid the rebound of the flat tube 31, and eliminate the assembly gap between the flat tube 31 and the fin 32.

[0115] In some embodiments, the notch 324 is arranged at one end of the slot 320 close to the slot opening 321. The bulge 315 is formed by protruding outward from the outer surface of the flat tube 31.

[0116] In some embodiments, there are two notches 324 arranged at the upper and lower sides of the slot 320 close to the slot opening 321. The upper notch 324 is formed by recessing upward from the upper end of the slot 320, and the lower notch 324 is formed by recessing downward from the lower end of the slot 320.

[0117] There is one bulge 315 arranged on each of the first flat tube side wall 311 and the second flat tube side wall 312 of the flat tube 31.

[0118] The upper notch 324 cooperates with the bulge 315 on the first flat tube side wall 311, and the lower notch 324 cooperates with the bulge 315 on the second flat tube side wall 312.

[0119] When the flat tube 31 is inserted into the slot 320 on the fin 32, the bulge 315 on the flat tube 31 is clamped into the notch 324 on the fin 32, which ensures that the flat tube 31 is assembled in place and avoids the deviation of the flat tube 31 to the slot opening 321, thereby eliminating the assembly gap of the flat tube 31 on the slot bottom 322 of the fin 32.

[0120] In addition, when condensate water / defrosting water is generated on the heat exchanger 30, most of the water will flow downward along the leeward side of the fin 32, and the water on the upper surface of the flat tube 31 will also flow to the leeward side. In the present application, the bulge 315 is arranged close to the slot opening 321 of the slot 320, i.e. close to the windward side, which can avoid the obstruction of the bulge 315 to the water.

[0121] If the bulge 315 is arranged at the middle of the flat tube 31 or at the end of the flat tube 31 away from the slot opening 321, the water on the upper surface of the flat tube 31 will be blocked by the bulge 315 and stay on the flat tube 31, thereby causing the problem of difficult drainage on the flat tube 31.

[0122] In some embodiments, the bulge 315 is arranged on the flat tube segment close to the slot opening 321. The thickness Ht of the flat tube segment is not greater than the slot height Hf of the slot segment matched therewith.

[0123] Since the bulge 315 needs to be pressed into the notch 324 by external force, if the flat tube segment where the bulge 315 is arranged is matched with the fin 32 with negative clearance, the frictional resistance of the part of the flat tube 31 assembled into the fin 32 will be further increased. Therefore, in this embodiment, the flat tube segment where the bulge 315 is arranged is matched with the fin 32 without negative clearance, which can reduce the frictional resistance during assembly.

[0124] In some embodiments, the end of the upper side of the bulge 315 close to the notch 321 is located at the junction of the first flat tube side wall 311 and the first circular arc side wall 313. The end of the lower side of the bulge 315 close to the notch 321 is located at the junction of the second flat tube side wall 312 and the first circular arc side wall 313.

[0125] In some embodiments, continuing to refer to Figure 8 , the vertical plane passing through the junction of the first circular arc side wall 313 and the first flat tube side wall 311 is face Q, and the end of the bulge 315 close to the notch 321 is located on face Q.

[0126] In some embodiments, referring to Figure 11 , the size w11 of the notch portion 324 in the width direction of the flat tube 31 is greater than the size w12 of the notch portion 324 in the height direction.

[0127] Correspondingly, referring to Figure 9 , the size w21 of the bulge 315 in the width direction of the flat tube 31 is greater than the protrusion height w22 of the bulge 315.

[0128] w11 and w21 are large, which can ensure that the notch portion 324 and the bulge 315 have a larger fitting area, so as to avoid the bulge 315 from being easily detached from the notch portion 324.

[0129] w12 and w22 are small, which can reduce the assembly difficulty of the bulge 315 into the notch portion 324 when the flat tube 32 is assembled to the fin 32.

[0130] In some embodiments, the bulge 315 is projected on a plane orthogonal to the thickness direction of the fin 32, and the bulge 315 is in the shape of an isosceles trapezoid in the projection, and the notch portion 324 is in the shape of an isosceles trapezoid. The upper base of the isosceles trapezoid is located away from the flat tube 31, and the lower base of the isosceles trapezoid is located close to the flat tube 31.

[0131] In some embodiments, the bulge 315 includes a first bulge side surface 3151. The first bulge side surface 3151 is arranged above and below the first flat tube side wall 311.

[0132] The bulge 315 includes a second bulge side surface 3152. The second bulge side surface 3152 extends from the end of the first bulge side surface 3151 away from the notch 321 to the direction close to the flat tube 31 and the groove bottom 322. The second bulge side surface 3152 is an inclined surface, which is conducive to the assembly of the bulge 315 to the notch portion 324.

[0133] The bulge 315 includes a third bulge side surface 3153. The third bulge side surface 3153 is connected to the end of the first bulge side surface 3251 close to the notch 321.

[0134] The third bulging side 3252 extends from the first bulging side 3251 in a direction close to the flat tube 31 and the notch 321.

[0135] The second bulging side 3152 and the third bulging side 3153 are respectively connected to both ends of the first bulging side 3151 in the width direction of the flat tube 31.

[0136] The distance between the second bulging side 3152 and the third bulging side 3153 gradually increases in the height direction close to the flat tube 31 from the first bulging side 3151.

[0137] In some embodiments, the fin 32 is provided with a first notched side 3241. The first notched side 3241 is perpendicular to the height direction.

[0138] The fin 32 is provided with a second notched side 3242 and a third notched side 3243. The second notched side 3242 and the third notched side 3243 are respectively connected to both ends of the first notched side 3241 in the width direction of the flat tube.

[0139] The space surrounded by the first notched side 3241, the second notched side 3242 and the third notched side 3243 forms a notched part 324.

[0140] The distance between the second notched side 3242 and the third notched side 3243 gradually increases in the height direction close to the flat tube 31 from the first notched side 3241.

[0141] As can be seen from the above, in the embodiments provided by the present application, the flat tube 31 includes a first flat tube segment 3261 and a second flat tube segment 3262 arranged in the width direction thereof, the insertion groove 320 includes a first insertion groove segment 3201 matched with the first flat tube segment 3261 and a second insertion groove segment 3202 matched with the second flat tube segment 3262, the thickness Htm of the first flat tube segment 3261 is not greater than the groove height Hfm of the first insertion groove segment 3201, and the thickness Htn of the second flat tube segment 3262 is not less than the groove height Hfn of the second insertion groove segment 3201; or, the thickness Htm of the first flat tube segment 3261 is not less than the groove height Hfm of the first insertion groove segment 3201, and the thickness Htn of the second flat tube segment 3262 is not greater than the groove height Hfn of the second insertion groove segment 3201, so that a part of the flat tube 31 and the fin 32 are matched in non-negative clearance fit, and a part of them are matched in non-positive clearance fit. In this way, the length of the flat tube 31 and the fin 32 in negative clearance fit can be reduced, so that the resistance of the flat tube 31 inserted into the fin 32 is reduced, and then the rebound of the flat tube 31 after being inserted into the fin 32 is reduced, and thus the assembly clearance between the flat tube 31 and the fin 32 at the groove bottom 322 is reduced.

[0142] In addition, the flat tube 31 is arranged in multiple stepped flat tube segments, a part of the flat tube segments are non-negative clearance fit with the fins 32, and another part of the flat tube segments are non-positive clearance fit with the fins 32, by adjusting the size of each flat tube segment, the frictional resistance in the assembly process can be greatly reduced, thereby reducing the rebound of the flat tube 31 after being inserted into the fins 32.

[0143] In addition, the flat tube 31 is arranged in a stepped manner decreasing from the windward side to the leeward side, which is conducive to the flow of condensate / demisting water on the upper surface of the flat tube 31 to the leeward side, and improves the drainage efficiency of the heat exchanger 30.

[0144] In addition, the positioning structure of the gap part 324 and the bulge part 315 between the flat tube 31 and the slot 320 can realize the self-locking function of the flat tube 31 after being inserted into the fins 32, avoid the rebound of the flat tube 31, and eliminate the assembly gap between the flat tube 31 and the fins 32.

[0145] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0146] In order to facilitate explanation, the above description has been made in combination with specific embodiments. However, the above exemplary discussion is not intended to exhaust or limit the embodiments to the specific forms disclosed above. Various modifications and variations can be derived according to the above teachings. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. An air conditioner, characterized in that, include: case; The fan is located inside the housing; A heat exchanger for exchanging heat with the fan-driven air, the heat exchanger comprising: A flat tube, extending from the windward side to the leeward side of the heat exchanger, comprises multiple flat tube segments with progressively decreasing thickness. Each flat tube segment includes: The first flat tube section has a thickness of Htm; The second flat tube section has a thickness of Htn; Fins, wherein the fins are provided with slots, the slots comprising multiple slot segments, the slot segments comprising: The first slot section mates with the first flat tube section, and the slot height of the first slot section is Hfm; The second slot section mates with the second flat tube section, and the slot height of the second slot section is Hfn; Hfm-Htm≥0, Hfn-Htn≤0; or Hfm-Htm≤0, Hfn-Htn≥0.

2. The air conditioner according to claim 1, characterized in that, The first flat tube segment and the second flat tube segment are any two adjacent flat tube segments among a plurality of flat tube segments.

3. The air conditioner according to claim 1, characterized in that, The fin has a flange that folds in the thickness direction, and the flange is located around the slot. The flange height along the thickness direction of the fin is Hj; Hj gradually decreases from the slot opening to the bottom of the slot.

4. The air conditioner according to claim 1, characterized in that, The two ends of the flat tube in the width direction are arc-shaped. The plane passing through the center of the arc and orthogonal to the height direction of the heat exchanger is plane P. The flat tube is symmetrical with respect to plane P.

5. The air conditioner according to claim 1, characterized in that, The thickness of the first flat tube segment is greater than the thickness of the second flat tube segment; the flat tube is provided with a plurality of flow holes, and the height of the flow holes in the first flat tube segment is greater than the height of the flow holes in the second flat tube segment.

6. The air conditioner according to claim 1, characterized in that, The outer surfaces of two adjacent flat tube segments are connected by an inclined plane.

7. The air conditioner according to any one of claims 1-6, characterized in that, The slot has a notch near its opening, and the flat tube has a bulge that mates with the notch.

8. The air conditioner according to claim 7, characterized in that, The thickness of the flat tube segment near the slot opening is not greater than the height of the slot segment that mates with it.

9. The air conditioner according to claim 7, characterized in that, The notch is larger in width direction than in height direction of the flat tube.

10. An air conditioner, characterized in that, include: case; The fan is located inside the housing; A heat exchanger for exchanging heat with the fan-driven air, the heat exchanger comprising: Flat tube, the flat tube comprising: The first flat tube section has a thickness of Htm; The second flat tube segment is arranged along the width direction of the flat tube with the first flat tube segment, and the thickness of the second flat tube segment is Htn. Fins, wherein the fins are provided with slots, the slots comprising: The first slot section mates with the first flat tube section, and the slot height of the first slot section is Hfm; The second slot section mates with the second flat tube section, and the slot height of the second slot section is Hfn; Hfm-Htm≥0, Hfn-Htn≤0; or Hfm-Htm≤0, Hfn-Htn≥0.

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