Air pipe type air conditioner

Abstract

The invention discloses an air duct type air conditioner and aims to solve the problem that an indoor heat exchanger of an air duct type air conditioner is low in heat exchange efficiency. The indoor unit of the air pipe type air conditioner comprises a shell fan assembly and an indoor heat exchanger. The fan assembly and the indoor heat exchanger are located in the mounting cavity of the shell and distributed in the first linear direction at intervals. The fan assembly is used for driving air to flow through the indoor heat exchanger. And in the first linear direction, the two opposite ends of the indoor heat exchanger in the second linear direction are bent towards the fan assembly. The length direction of the indoor heat exchanger, the first linear direction and the second linear direction are perpendicular to one another. The side, facing the fan assembly in the first linear direction, of the indoor heat exchanger is a windward side. When air blown to the indoor heat exchanger by the fan assembly flows through the windward side of the indoor heat exchanger, the included angle between the flowing direction of the air at the position and the windward side of the indoor heat exchanger is 60-90 degrees. The air conditioner is used for improving the heat exchange efficiency of the indoor unit.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a duct type air conditioner. Background Art

[0002] The indoor unit of the duct air conditioner is a duct unit. Due to the advantages of the duct unit such as concealed installation and easy coordination with home ceiling decoration, the duct air conditioner has better aesthetics when installed indoors.

[0003] When the air conditioner is running, inside the duct unit, the fan assembly rotates so that the air near the shell enters the shell. The air exchanges heat with the heat exchanger while passing through the heat exchanger. The air after heat exchange can flow out of the shell and adjust the temperature and / or humidity of the installation area.

[0004] Since the height dimension of the internal space of the shell in the vertical direction is limited, the heat exchanger installed in the shell can be a flat plate structure and arranged obliquely. Alternatively, the heat exchanger installed in the shell can also be a V-shaped heat exchanger spliced ​​by two flat plate structures, and the opening of the heat exchanger is arranged toward the fan assembly.

[0005] However, in the shell space between the fan assembly and the heat exchanger, more air blown from the fan assembly to the heat exchanger will flow along the windward side surface of the heat exchanger close to the fan assembly. That is, this part of the air will not directly flow into the gap between two adjacent fins in the heat exchanger, thereby affecting the ventilation volume and heat exchange effect of the indoor heat exchanger. Summary of the invention

[0006] The object of the present invention is to provide a duct type air conditioner, aiming to solve the problem of low heat exchange efficiency of the indoor heat exchanger of the duct type air conditioner.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme:

[0008] The present invention provides a duct type air conditioner, the air conditioner comprises an indoor unit, the indoor unit comprises a housing fan assembly and an indoor heat exchanger. The housing has an installation cavity, the fan assembly and the indoor heat exchanger are located in the installation cavity and are spaced apart along a first straight line direction, and the fan assembly is used to drive air to flow through the indoor heat exchanger. Along the first straight line direction, the indoor heat exchanger is bent toward the fan assembly at two opposite ends in a second straight line direction, so that the indoor heat exchanger has an opening facing the fan assembly. The length direction of the indoor heat exchanger, the first straight line direction and the second straight line direction are perpendicular to each other, and the side of the indoor heat exchanger facing the fan assembly along the first straight line direction is the windward side.

[0009] The indoor heat exchanger is configured such that when the air blown toward the indoor heat exchanger by the fan assembly flows through the windward side of the indoor heat exchanger, the angle formed by the flow direction of the air at this position and the windward side of the indoor heat exchanger is 60° to 90°.

[0010] Based on this, in the installation cavity of the indoor unit of the duct structure, since the fan assembly can drive the air to flow through the indoor heat exchanger, the indoor heat exchanger can quickly exchange heat with the air flowing through. In this process, on the windward side of the indoor heat exchanger close to the fan assembly, the angle between the air flow direction and the windward surface corresponding to the windward side is different. When the angle between the air flow direction and the windward surface is less than 60°, the air will easily flow along the windward surface, that is, the air will not flow into the gap between two adjacent fins in the indoor heat exchanger, so that this part of the air cannot fully contact the indoor heat exchanger and exchange heat.

[0011] Thus, in the embodiment of the present application, the opening angle of the indoor heat exchanger, the inclined installation position of the indoor heat exchanger, and the installation distance between the indoor heat exchanger and the fan assembly can be changed so that when part or all of the air flows through the windward surface, the angle between the air flow direction and the windward surface can be greater than or equal to 60°. In this way, when part or all of the air is blown toward the windward side of the indoor heat exchanger, since the angle between the air flow direction and the windward surface is greater than or equal to 60°, part or all of the air can flow between two adjacent fins, and while the air fully exchanges heat with the indoor heat exchanger, the air can flow out smoothly from the leeward side of the indoor heat exchanger, which is also conducive to increasing the air volume and wind uniformity flowing through the indoor heat exchanger, thereby improving the overall heat exchange efficiency of the indoor unit.

[0012] In some embodiments, the range of the opening angle α formed by bending the two ends of the indoor heat exchanger toward the fan assembly is: 75°≤α≤85°.

[0013] In some embodiments, the range of the opening angle α formed by bending the two ends of the indoor heat exchanger toward the fan assembly is: 85°<α≤95° or 95°<α≤105°.

[0014] In some embodiments, the indoor heat exchanger includes a plurality of refrigerant tubes and a plurality of fins. The fins are an integrated sheet structure. The plurality of fins are spaced apart along the length direction of the indoor heat exchanger, and the refrigerant tube vertically penetrates the plurality of fins along the length direction of the indoor heat exchanger and is in contact with and connected to the plurality of fins. The edge of the fin close to the fan assembly along the first straight line is its windward side edge.

[0015] In some embodiments, the fin includes a first connecting piece and a second connecting piece, the second connecting piece is connected to the first connecting piece, and the angle formed by the windward edge of the first connecting piece and the windward edge of the second connecting piece is the opening angle of the indoor heat exchanger.

[0016] In some embodiments, along the second straight line direction, the air outlet of the fan assembly and the first connecting piece are arranged on the same side close to the installation cavity.

[0017] In some embodiments, the fan assembly is a centrifugal fan.

[0018] In some embodiments, the inclination ratio K of the angle formed by the windward edge of the first connecting piece and the first straight line direction to the opening angle is in the range of 6 / 17≤K<7 / 17, 7 / 17≤K<8 / 17 or 8 / 17≤K≤9 / 17.

[0019] In some embodiments, the inclination ratio of the angle formed by the windward edge of the first connecting piece and the first straight line direction to the opening angle is 1 / 2 to 9 / 17.

[0020] In some embodiments, the opening angle is 85°, and the angle formed by the windward edge of the first connecting piece and the first straight line direction is 45°.

[0021] In some embodiments, the maximum distance L between the windward edge of the fin and the air outlet of the fan assembly in the first straight line direction is in the range of: 136mm≤L<146mm, 146mm≤L<156mm or 156mm≤L≤166mm.

[0022] In some embodiments, the maximum distance between the windward edge of the fin and the air outlet of the fan assembly in the first straight line direction is 141-151 mm.

[0023] In some embodiments, the height dimension of the installation cavity in the second straight direction is 185-195 mm.

[0024] In some embodiments, the intersection of the windward side edge of the first connecting piece and the windward side edge of the second connecting piece is the vertex of the opening angle.

[0025] In some embodiments, the first connecting piece is connected to the second connecting piece via a chamfered or rounded structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the connection structure of a duct air conditioner provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 A schematic diagram of a structure in which a gas-liquid separator and an oil separator are installed between the compressor and the four-way valve shown in FIG.

[0029] Figure 3 for Figure 1 A schematic diagram of a connection structure in which no four-way valve is provided between the compressor and the outdoor heat exchanger and the indoor heat exchanger as shown in FIG.

[0030] Figure 4 A side view of an indoor unit of a first duct-type air conditioner provided in an example of the present application;

[0031] Figure 5 for Figure 4 A three-dimensional structural schematic diagram of an indoor heat exchanger shown in;

[0032] Figure 6 A side view of an indoor unit of a second duct-type air conditioner provided in the present application example;

[0033] Figure 7 A side view of an indoor unit of a third duct-type air conditioner provided in the present application example;

[0034] Figure 8 A schematic diagram of a broken line relationship between the opening angle of the indoor heat exchanger and its air volume provided in an embodiment of the present application;

[0035] Fig. 9 A side view of an indoor unit of a fourth duct-type air conditioner provided in the present application example;

[0036] Fig.10 A schematic diagram of a broken line relationship between the installation spacing of the indoor heat exchanger and the fan assembly and the air volume provided in an embodiment of the present application;

[0037] Fig.11 for Fig. 9 The first wind field simulation diagram when the upper end of the indoor heat exchanger is tilted at a large angle is shown in FIG.

[0038] Fig.12 for Fig. 9The second wind field simulation diagram when the upper end of the indoor heat exchanger is tilted at a larger angle is shown in FIG.

[0039] Fig.13 A schematic diagram of a broken line relationship between the tilt ratio of the indoor heat exchanger and its air volume provided in an embodiment of the present application;

[0040] Fig.14 for Fig. 9 The first wind field simulation diagram when the upper end of the indoor heat exchanger is tilted at a small angle is shown in FIG.

[0041] Fig.15 for Fig. 9 The first wind field simulation diagram when the upper end of the indoor heat exchanger is tilted at a small angle is shown in FIG.

[0042] Reference numerals:

[0043] 100-air conditioner;

[0044] 10-compressor; 20-four-way valve; 30-outdoor heat exchanger; 40-throttling device;

[0045] 50-indoor heat exchanger; 51-refrigerant pipe; 52-fin; 521-first connecting piece; 522-second connecting piece; 53-connecting hole;

[0046] 61-gas-liquid separator; 62-oil separator;

[0047] 70-housing; 71-installation cavity; 72-air outlet; 73-air inlet;

[0048] 80- fan assembly; 81- air outlet; 82- volute. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or relative positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Unless otherwise specified, the above-mentioned directional description can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the accompanying drawings is satisfied.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "connected" should be understood in a broad sense, such as fixed connection, detachable connection, and integral connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the electrical connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] It should be noted that in actual applications, due to the limitations of equipment accuracy or installation errors, absolute parallel or perpendicular effects are difficult to achieve. The description of perpendicularity, parallelism or co-ordination in this application is not an absolute limiting condition, but means that a perpendicular or parallel structure setting can be achieved within a preset error range (such as an upper and lower deviation of 5°) and the corresponding preset effect can be achieved, thereby maximizing the technical effect of the defined feature and making the corresponding technical solution easy to implement and having high feasibility.

[0054] In the embodiments of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.

[0055] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a specific way.

[0056] An air conditioner is a device that can adjust and control the temperature, humidity and circulating air of the ambient air in a building or structure.

[0057] like Figure 1 As shown, the present application provides a duct type air conditioner (hereinafter referred to as air conditioner 100), which may include a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, a throttling device 40 and an indoor heat exchanger 50. For example, referring to Figure 1 The four-way valve 20 may have a first port A, a second port B, a third port C and a fourth port D, and the compressor 10 may have a return port and an outlet port (not shown in the figure).

[0058] The return air port of the compressor 10 can be connected to the first port A of the four-way valve, the air outlet of the compressor 10 can be connected to the second port B of the four-way valve, the third port C of the four-way valve can be connected to one end of the outdoor heat exchanger 30, the other end of the outdoor heat exchanger 30 can be connected to one end of the indoor heat exchanger 50 through the throttling device 40, and the other end of the indoor heat exchanger 50 can be connected to the fourth port D of the four-way valve.

[0059] The air conditioner 100 may include an indoor unit and an outdoor unit. The compressor 10, the four-way valve 20 and the outdoor heat exchanger 30 may be part of the outdoor unit, and the corresponding indoor heat exchanger 50 may be part of the indoor unit. The throttling device 40 may be a capillary structure or an electronic expansion valve structure. The throttling device 40 may be installed in the outdoor unit or in the indoor unit. The throttling device 40 may also be installed in the refrigerant pipeline between the outdoor unit and the indoor unit. The throttling device 40 only needs to be located between the indoor heat exchanger 50 and the outdoor heat exchanger 30 along the flow direction of the refrigerant.

[0060] Based on this, driven by the compressor 10, the refrigerant can circulate between the indoor unit and the outdoor unit and produce a reversible phase change, and while the refrigerant produces a phase change, it can release or absorb heat through the heat exchanger.

[0061] For example, the refrigerant in the outdoor unit can exchange heat with the surrounding medium (such as air) through the outdoor heat exchanger 30, thereby releasing heat and heating the surrounding air (or absorbing heat to cool the nearby air). The refrigerant in the indoor unit can exchange heat with the surrounding air through the indoor heat exchanger 50, thereby absorbing heat to cool the surrounding air (or releasing heat to heat the nearby air).

[0062] By setting the four-way valve 20, the operation mode of the air conditioner 100 can be flexibly adjusted between the hot-cooling condition and the heating condition, so that the air conditioner 100 can be applied to more usage scenarios.

[0063] When the air conditioner 100 is in cooling or dehumidification mode, Figure 1 Taking the solid arrow shown in FIG. 2 as an example, the four-way valve 20 can be adjusted to connect the second port B and the third port C, and to connect the fourth port D and the first port A.

[0064] In this way, the high-pressure gaseous refrigerant compressed by the compressor 10 can flow from the outlet through the second port B and the third port C of the four-way valve 20 to the outdoor heat exchanger 30, so that the high-temperature and high-pressure gaseous refrigerant can be liquefied and release heat at the outdoor heat exchanger 30 to heat the air near the outdoor heat exchanger 30.

[0065] Subsequently, under the action of the throttling device 40, the pressure of the liquid refrigerant passing through the throttling device 40 and flowing into the indoor heat exchanger 50 is reduced, so that the liquid refrigerant can absorb heat and vaporize at the indoor heat exchanger 50, thereby exchanging and transferring heat between the outdoor heat exchanger 30 and the indoor heat exchanger 50 and cooling the air near the indoor heat exchanger 50. The refrigerant flowing out of the indoor heat exchanger 50 after vaporization can flow through the fourth port D and the first port A of the four-way valve 20 in sequence, and then the gaseous refrigerant can be sucked into the compressor 10 through the return air port and compressed, thereby realizing the circulation of the refrigerant.

[0066] When the air conditioner 100 is in the heating state, Figure 1 Taking the dashed arrow shown in FIG. 2 as an example, the four-way valve 20 can be adjusted to connect the second port B and the fourth port D, and to connect the third port C and the first port A.

[0067] In this way, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 10 can flow from the air outlet through the second port B and the fourth port D of the four-way valve 20 to the indoor heat exchanger 50, so that the high-temperature and high-pressure gaseous refrigerant can be liquefied and release heat at the indoor heat exchanger 50 to heat the air near the indoor heat exchanger 50.

[0068] Subsequently, under the action of the throttling device 40, the pressure of the liquid refrigerant passing through the throttling device 40 and flowing into the outdoor heat exchanger 30 is reduced, so that the liquid refrigerant can absorb heat and vaporize at the outdoor heat exchanger 30, thereby exchanging and transferring heat between the outdoor heat exchanger 30 and the indoor heat exchanger 50 and cooling the air around the outdoor heat exchanger 30. The vaporized refrigerant can flow through the third port C and the first port A of the four-way valve 20 in sequence, and then the gaseous refrigerant can be sucked into the compressor 10 through the return air port and compressed, thereby realizing the circulation of the refrigerant.

[0069] In order to prevent the gaseous refrigerant sucked into the compressor 10 from being mixed with liquid refrigerant or impurities, Figure 2 As shown, the air conditioner 100 may further include a gas-liquid separator 61, which may be installed between the first port A of the four-way valve 20 and the return air port of the compressor 10, so that the first port A may be connected and conducted with the return air port of the compressor 10 through the gas-liquid separator 61. In this way, when the gaseous refrigerant mixed with impurities such as liquid refrigerant or lubricating oil flows to the return air port of the compressor 10 through the gas-liquid separator 61, the gas-liquid separator 61 may separate non-gaseous impurities (such as liquid refrigerant, liquid lubricating oil or other impurities) to prevent the above impurities from entering the compressor 10 and affecting the stable operation of the compressor 10.

[0070] Continue to refer to Figure 2 The air conditioner 100 may further include an oil separator 62, and the air outlet of the compressor 10 and the second port B of the four-way valve 20 may also be connected and conducted through the oil separator 62. In this way, the lubricating oil mixed in the high-temperature and high-pressure gaseous refrigerant can be separated in the process of flowing through the oil separator 62, thereby preventing the lubricating oil from adhering to the inner walls of the outdoor heat exchanger 30 and the indoor heat exchanger 50 when the refrigerant flows through the outdoor heat exchanger 30 and the indoor heat exchanger 50, so that the indoor heat exchanger 50 and the outdoor heat exchanger 30 have a higher heat exchange efficiency.

[0071] In some other embodiments, it is also possible that a four-way valve is not required. Figure 3 As shown, the air outlet of the compressor 10 can be connected to one end of the throttling device 40 through the outdoor heat exchanger 30, and the air return port of the compressor 10 can be connected to the other end of the throttling device 40 through the gas-liquid separator 61 and the indoor heat exchanger 50 in sequence. So that the refrigerant can circulate between the compressor 10, the outdoor heat exchanger 30, the throttling device 40, the indoor heat exchanger 50, the gas-liquid separator 61 and the compressor 10, at this time, the outdoor heat exchanger 30 can be used to heat the nearby air, and the indoor heat exchanger 50 can be used to cool the nearby air, so that the air conditioner 100 operates in a cooling condition or a dehumidification condition (i.e., a cooling-only mode air conditioner).

[0072] Based on this, Figure 4As shown, the indoor unit of the duct structure may include a housing 70, a fan assembly 80 and an indoor heat exchanger 50, the housing 70 may have an installation cavity 71, and the fan assembly 80 and the indoor heat exchanger 50 may be arranged at intervals in the installation cavity 71. Taking the fan assembly 80 and the indoor heat exchanger 50 in the installation cavity 71 as an example, the fan assembly 80 and the indoor heat exchanger 50 are arranged at intervals along the front-to-back direction (i.e., the first straight line direction), the housing 70 may be provided with an air outlet 72 on the front side of the installation cavity 71, and the housing 70 may be provided with an air inlet 73 on the rear side of the installation cavity 71, so that the fan assembly 80 can drive air to flow through the indoor heat exchanger 50.

[0073] Based on this, the indoor heat exchanger 50 can be arranged near the front air outlet 72 in the installation cavity 71, and the fan assembly 80 can be arranged near the rear air inlet 73. In this way, when the air conditioner is running, the fan assembly 80 can rotate to drive air into the installation cavity 71 from the air inlet 73 and can be blown toward the indoor heat exchanger 50 from the air outlet of the fan assembly 80, so that the refrigerant flowing in the indoor heat exchanger 50 can quickly exchange heat with the air flowing through it.

[0074] like Figure 4 and Figure 5 As shown, the length direction of the indoor heat exchanger 50 and the shell 70 can be the left-right direction, and the indoor heat exchanger 50 can include a plurality of refrigerant tubes 51 and a plurality of fins 52. The refrigerant tubes 51 can extend in the left-right direction, and the fins 52 can be an integrated sheet structure. The plurality of fins 52 can be spaced apart in the left-right direction (i.e., the length direction of the indoor heat exchanger 50), and the refrigerant tube 51 can pass through the plurality of fins 52 in the left-right direction and be in contact with and connected to the plurality of fins 52 to form an indoor heat exchanger 50 of an integrated structure.

[0075] Combination Figure 4 , a plurality of plug holes 53 may be provided on a fin 52, and the plurality of plug holes 53 on the plurality of fins 52 may be aligned in the left-right direction, so that the refrigerant tube 51 passing through the plug hole 53 and through the fin 52 may be in contact with the fin 52 while the plurality of refrigerant tubes 51 may be distributed at intervals in the plane of the fin 52. In this way, the plurality of refrigerant tubes 51 may be connected to form one or more refrigerant passages, so that the flowing refrigerant may fully contact the air through the refrigerant tube 51 and the fin 52, thereby improving the heat exchange efficiency of the indoor heat exchanger 50.

[0076] Taking the fin 52 as a rectangular sheet structure as an example, a plurality of fins 52 and a plurality of refrigerant tubes 51 can be connected to form a Figure 5 The flat plate heat exchanger shown. Figure 4In the installation cavity 71 shown, since the height dimension of the installation cavity 71 in the up and down direction (i.e., the second straight line direction) is limited, the upper side edge of the flat-plate structure indoor heat exchanger 50 can be arranged to tilt backward, so that the heat exchange area of ​​the indoor heat exchanger 50, such as the length dimension of the fin 52, can be increased within the limited height space.

[0077] In some other embodiments, such as Figure 6 As shown, multiple flat plate heat exchangers can also be spliced ​​together, such as two heat exchangers can be spliced ​​and installed in the up-down direction, and the lower edge of an upper heat exchanger can be connected to the upper edge of a lower heat exchanger to form a spliced ​​structure indoor heat exchanger 50. Taking the indoor heat exchanger 50 formed by splicing two flat plate heat exchangers as an example, along the second straight line direction, the upper end of the indoor heat exchanger 50 can be tilted or bent backward, and the lower end of the indoor heat exchanger 50 can also be tilted or bent backward, so that the indoor heat exchanger 50 can form an opening toward the fan assembly 80.

[0078] In this way, in a plane perpendicular to the front-to-back direction, the cross-section of the indoor heat exchanger 50 can be approximately a V-shaped structure, that is, the upper end and the lower end of the indoor heat exchanger 50 can be arranged to tilt backward in the installation cavity 71 to increase the contact area between the indoor heat exchanger 50 (especially the fins 52) and the air in the installation cavity 71.

[0079] However, in the installation cavity 71, since the air outlet of the fan assembly 80 is arranged toward one side of the installation cavity 71 in the vertical direction, for example, the air outlet of the fan assembly 80 can be arranged upward, the windward side (i.e., the rear side) of the indoor heat exchanger 50 facing the fan assembly 80 cannot be evenly contacted with the air, thereby affecting the ventilation volume and heat exchange effect of the indoor heat exchanger 50, that is, the overall heat exchange efficiency of the indoor unit is low.

[0080] Moreover, in the installation cavity 71 between the indoor heat exchanger 50 and the fan assembly 80, on the upper windward side of the indoor heat exchanger 50, more air will flow along the surface where the windward side is located, that is, this part of the air will not directly flow into the gap between two adjacent fins 52, thereby affecting the ventilation volume and heat exchange effect of the indoor heat exchanger.

[0081] Based on this, the opening size of the indoor heat exchanger 50 can be adjusted, and / or the installation position of the indoor heat exchanger 50 can be adjusted relative to the fan assembly 80. In this way, when the air blown by the fan assembly to the indoor heat exchanger 50 flows through its windward side, the flow direction of part or all of the air at this position can be set to form an angle of 60° to 90° with the windward side of the indoor heat exchanger 50, which is conducive to improving the wind uniformity and ventilation volume on the windward side of the indoor heat exchanger 50, thereby improving the heat exchange efficiency of the indoor heat exchanger 50.

[0082] It should be noted that, in the embodiments of the present application, the range of values ​​of 60° to 90° is taken as an example. If there is no larger range, it means that the angle range is greater than or equal to 60° and less than or equal to 90°. That is, unless otherwise specified, the range of values ​​on both sides of the symbol "~" includes equal to.

[0083] In some embodiments, the indoor heat exchanger 50 located in the installation cavity 71 may have an opening structure facing the fan assembly 80. The indoor heat exchanger 50 may be Figure 6 The spliced ​​structure shown can also be Figure 7 The indoor heat exchanger 50 of the integrated structure is shown. Based on this, the opening angle α formed by the upper and lower ends of the indoor heat exchanger 50 bending toward the fan assembly 80 can be set to be 75° to 105°, that is, the range of the opening angle can be greater than or equal to 75° and less than or equal to 105°, which is used to improve the heat exchange efficiency of the indoor heat exchanger 50.

[0084] Combination Figure 7 and Figure 8 , while keeping the speed of the fan assembly 80 unchanged, it can be known from the simulation comparison experiment that when the opening angle α of the indoor heat exchanger 50 increases from 75° to 105°, the air volume flowing through the indoor heat exchanger 50 per unit time gradually increases. Among them, when the opening angle increases from 85° to 95°, the air volume flowing through the indoor heat exchanger 50 increases faster, when the opening angle increases from 75° to 85°, the air volume flowing through the indoor heat exchanger 50 increases slower, and when the opening angle increases from 95° to 105°, the air volume flowing through the indoor heat exchanger 50 increases slower.

[0085] Based on this, the value range of the opening angle α can be 75° to 85°. Correspondingly, the air volume flowing through the indoor heat exchanger 50 with an opening angle of 75° is approximately 567m 3 The air volume flowing through the indoor heat exchanger 50 with an opening angle of 85° is approximately 575m per hour. 3 per hour.

[0086] Alternatively, the opening angle may be set in a range of 85°<α≤95° or 95°<α≤105°. For example, the air volume flowing through the indoor heat exchanger 50 with an opening angle of 95° is approximately 588m 3 The air volume flowing through the indoor heat exchanger 50 with an opening angle of 105° is approximately 589m per hour. 3 per hour.

[0087] Among them, the wind volume is approximately 570m 3 / h, the opening angle of the indoor heat exchanger 50 can be 78°, that is, the opening angle can also be set to 75°≤α<78° or 78°≤α≤85°. Correspondingly, the air volume is approximately 580m 3 The opening angle of the indoor heat exchanger 50 with a flow rate of 100 mph can be 88.6°, and the air volume is approximately 585 m 3 The opening angle of the indoor heat exchanger 50 per hour may be 92.7°, that is, the opening angle may also be set to 85°≤α<88.6°, 88.6°≤α<92.7° or 92.7°≤α≤95°.

[0088] In the installation cavity 71, due to the limited height of the indoor unit of the duct structure, such as Figure 7 As shown, the height dimension H of the installation cavity 71 in the vertical direction can be 185-195 mm, that is, 185 mm ≤ H ≤ 195 mm. In other words, the maximum height dimension of the indoor heat exchanger 50 in the vertical direction can be H, such as the height dimension of the installation cavity 71 can be 185 mm, 187 mm, 190 mm, 192 mm or 195 mm, etc., without limitation.

[0089] When the height of the indoor heat exchanger 50 is constant, the smaller the opening angle of the indoor heat exchanger 50 is, the longer the contour line of the windward edge of the indoor heat exchanger 50 is in the plane perpendicular to the left and right directions, and the larger the corresponding heat exchange area of ​​the indoor heat exchanger 50 is. However, this will make the path of the air flowing through the indoor heat exchanger 50 longer when it flows in the front-to-back direction. Although the air can exchange heat with the indoor heat exchanger 50 through a longer contact time, it will also cause the wind speed on the surface of the indoor heat exchanger 50 to be lower (i.e., the air volume is reduced) at the same speed of the fan assembly 80.

[0090] Based on this, if the opening angle of the indoor heat exchanger 50 is less than 75°, although the heat exchange area of ​​the indoor heat exchanger 50 is large, it will cause the indoor heat exchanger 50 to have a large wind resistance (that is, the side effects caused by the wind resistance are greater than the beneficial effects of the increase in the heat exchange area), that is, the air volume flowing through the indoor heat exchanger 50 is small and will further lead to a decrease in the overall heat exchange efficiency of the indoor heat exchanger 50. Correspondingly, if the opening angle of the indoor heat exchanger 50 is greater than 105°, although the wind resistance of the indoor heat exchanger 50 is small, the beneficial effect of the increase in air volume caused by the opening angle above 105° is less than the side effects caused by the reduction in the heat exchange area (that is, the wind speed is too fast and the heat exchange is insufficient), which will also lead to a decrease in the overall heat exchange efficiency of the indoor heat exchanger 50.

[0091] In summary, the opening angle of the indoor heat exchanger 50 is set between 75° and 105°, which is not only conducive to increasing the heat exchange area of ​​the indoor heat exchanger 50, but also conducive to increasing the air volume of the indoor unit, and is conducive to improving the indoor heat exchange efficiency and cooling or heating speed. Based on this, on the basis of taking into account the heat exchange efficiency and heat exchange speed (i.e., air volume) of the indoor unit, the opening angle can be set to 85°, that is, the indoor heat exchanger 50 can have a higher heat exchange efficiency, and the opening angle can also be set to 95 degrees (corresponding to a higher heat exchange speed).

[0092] It should be noted that, in the embodiment of the present application, if the indoor heat exchanger 50 is a spliced ​​structure, in a cross section perpendicular to the left and right directions, Figure 6 As shown, the opening angle is the angle between the upper and lower flat plate heat exchangers arranged backwards.

[0093] In some embodiments, if the height space of the installation cavity 71 is sufficient, or the width of the flat plate heat exchanger is small, one or more flat plate heat exchangers may be connected between the upper and lower inclined flat plate heat exchangers, so that the indoor heat exchanger 50 may be a C-shaped or W-shaped splicing structure in a cross section perpendicular to the left and right directions, which is not limited.

[0094] In addition, combined Figure 7 The indoor heat exchanger 50 may also be an integrated structure and have a rearward opening structure. The fin 52 may be an integrated sheet structure, and the fin 52 may include a first connecting sheet 521 and a second connecting sheet 522 , and the first connecting sheet 521 may be connected to the second connecting sheet 522 .

[0095] The fin 52 may be a sheet structure arranged perpendicular to the left-right direction (i.e., the second straight line direction), that is, the angle formed by the windward side (i.e., rear side) edge of the first connecting piece 521 and the windward side edge of the second connecting piece 522 is an opening angle α. In this way, the plurality of fins 52 are distributed at intervals in the left-right direction, and the plurality of refrigerant pipes 51 are sequentially passed through the plug holes 53 in the left-right direction, so as to contact and connect the plurality of fins 52, thereby forming an indoor heat exchanger 50 of an integrated structure.

[0096] During the installation of the indoor heat exchanger 50, the refrigerant pipe 51 only needs to be passed through the plurality of fins 52 in sequence, and the refrigerant pipe 51 and the plurality of fins 52 can be connected by brazing to meet the contact heat exchange between the two. No additional splicing operation is required, and the structure is simple.

[0097] It should be noted that, combined with Figure 7 and Fig. 9The first connecting piece 521 of the fin 52 can be located at the upper end of the second connecting piece 522, such as the lower end of the first connecting piece 521 can be in contact with the upper end of the second connecting piece 522 to form an integrated sheet-like structure of the fin 52. Figure 7 As shown, the windward side edge (i.e., the rear side edge) of the first connecting piece 521 can be approximately a straight-line structure, and the windward side edge of the second connecting piece 522 can also be approximately a straight-line structure, and the front end of the windward side edge of the first connecting piece 521 can form an opening angle with the front end of the windward side edge of the second connecting piece 522, that is, the vertex of the opening angle can be located at the intersection of the two windward side edges (approximately a V-shaped fin structure).

[0098] In addition, in order to make the angle between the windward edge of the fin 52 and the flow direction of the air in contact with it larger in the range of 60° to 90°, Fig. 9 , the first connecting piece 521 can also be connected to the second connecting piece 522 by a rounded or chamfered structure. For example, the windward side edge of the first connecting piece 521 and the windward side edge of the second connecting piece 522 can be connected by a circular arc edge or a chamfered edge, which is conducive to making the angle between the chamfered or rounded structure of the windward side edge and the air flowing through be between 60° and 90°, so that the indoor heat exchanger 50 can take into account both the ventilation volume and the heat exchange effect, so as to improve the overall heat exchange effect of the indoor unit.

[0099] It should be noted that in the above embodiment, the fin 52 may also be an arc-shaped or circular arc-shaped sheet structure. In this case, the rounded structure between the first connecting sheet 521 and the second connecting sheet 522 may be regarded as a third connecting sheet with an arc structure. The upper end and the lower end of the third connecting sheet may be bent and extended backward, and may be connected to the first connecting sheet 521 and the second connecting sheet 522 which are approximately rectangular sheet structures. The angle between the straight line direction where the windward side edges of the first connecting sheet 521 and the second connecting sheet 522 are located is the opening angle. For example, the fin may be approximately a C-shaped structure.

[0100] In some other embodiments, the fin 52 may also include a first connecting piece 521, a fourth connecting piece, a fifth connecting piece, and a second connecting piece 522 that are bent and connected in sequence to form a sheet-like fin 52 that is approximately in the shape of a letter W. Alternatively, the fourth connecting piece and the fifth connecting piece may also be connected by a third connecting piece of a rectangular structure, so that there is a gap between the two openings of the W shape in the vertical direction, which is beneficial to improving the heat exchange area and heat exchange efficiency of the indoor heat exchanger.

[0101] In which case, when the fin 52 includes the fourth connecting piece and the fifth connecting piece, the windward side edge line and / or the leeward side edge line between two adjacent connecting pieces may be connected by rounded corners or chamfered corners.

[0102] Since the length direction of the indoor heat exchanger 50 is the second straight line direction, in the installation cavity 71, Fig. 9 As shown, the installation spacing between the indoor heat exchanger 50 and the fan assembly 80 in the front-to-back direction can also be adjusted. The maximum spacing between the windward edge of the fin 52 and the air outlet 81 of the fan assembly 80 in the front-to-back direction is defined as L, that is, L is the installation spacing between the fan assembly 80 and the indoor heat exchanger 50, which can be set to 136mm≤L≤166mm, which is beneficial to improving the heat exchange effect of the indoor heat exchanger 50.

[0103] Combination Fig. 9 and Fig.10 Under the condition that the rotation speed of the fan assembly 80 and other dimensions of the indoor heat exchanger 50 remain unchanged, it is known through simulation comparison experiments that when the installation distance between the indoor heat exchanger 50 and the fan assembly 80 increases from 136mm to 166mm, the air volume flowing through the indoor heat exchanger 50 per unit time first increases and then decreases.

[0104] For example, the air volume flowing through the indoor heat exchanger 50 when the installation spacing is 136 mm is approximately 580.5 m 3 / h, the air volume flowing through the indoor heat exchanger 50 when the installation spacing is 146mm is approximately 584.1m 3 / h, the air volume flowing through the indoor heat exchanger 50 when the installation spacing is 156mm is approximately 581m 3 / h, the air volume flowing through the indoor heat exchanger 50 when the installation spacing is 166mm is approximately 575m 3 Based on this, the installation distance L between the indoor heat exchanger 50 and the fan assembly 80 can also be set to: 136mm≤L<146mm, 146mm≤L<156mm or 156mm≤L≤166mm. In the above four installation distance intervals, the air volume flowing through the indoor heat exchanger 50 can change linearly.

[0105] Based on this, the installation spacing L of the indoor heat exchanger 50 can also be set to 141 mm ≤ L ≤ 151 mm, so that the air volume flowing through the indoor heat exchanger 50 is 582.5 m 3 / h or more, and a larger adaptation error range is provided when assembling the indoor heat exchanger 50 and the fan assembly 80 (facilitating the assembly of the indoor unit). In addition, it is advantageous to make the angle between the fins at the windward edge and the flow direction of the air flowing through 60° to 90°, so that the indoor heat exchanger 50 can take into account both the ventilation volume and the heat exchange effect, thereby improving the overall heat exchange effect of the indoor unit.

[0106] For example, when the height dimension H of the installation cavity 71 is 185 mm to 195 mm, when the installation distance between the fan assembly 80 and the indoor heat exchanger 50 is about 146 mm, the air volume flowing through the indoor heat exchanger 50 is relatively large and is 585 m 3 / h, which is beneficial to improving the overall heat exchange effect of the indoor unit.

[0107] For the indoor heat exchanger 50, in the installation cavity 71, the indoor heat exchanger 50 can be installed symmetrically compared to the plane in the front-to-back direction and the left-to-right direction, or the upper end of the indoor heat exchanger 50 (i.e., the first connecting piece 521) can be installed tilted backward, and the tilt angle can be larger or smaller.

[0108] Based on this, the upper end (i.e., the first connecting piece) of the indoor heat exchanger 50 can be set to have a larger tilt angle backward, that is, the first connecting piece 521 can have a larger length dimension than the second connecting piece 522. Since the air outlet of the fan assembly 80 is arranged at the top, it can be known through the wind field experimental simulation of the indoor heat exchanger 50 at this time.

[0109] like Fig.11 and Fig.12 As shown, at the windward side edge of the plurality of first connecting sheets 521 (area A in the figure), most of the air at the windward side edge of the first connecting sheet 521 has a small angle with the edge (such as an angle size less than 60°), so that most of the air will flow along the indoor heat exchanger 50 (such as Fig. 9 The air flows along the windward side surface of the indoor heat exchanger 50, that is, the air does not flow into the gap between two adjacent fins 52. As a result, the air volume flowing through the upper area of ​​the indoor heat exchanger 50 is greatly reduced.

[0110] It should be noted that, in the embodiment of the present application, the maximum angle between the air and the windward edge of the first connecting piece 521 or the windward surface of the indoor heat exchanger is 90°, that is, there is no situation where the angle between the air flow direction and the windward surface is an obtuse angle.

[0111] Combination Fig.11 and Fig.12 In the installation cavity 71 behind the plurality of second connecting pieces 522 (area B in the figure), air will form a vortex region there, so that the indoor heat exchanger 50 (such as Fig. 9 The air volume flowing through the lower area is reduced.

[0112] Based on this, in combination with the above embodiment, by setting the opening angle of the indoor heat exchanger 50 to 75° to 105°, and setting the installation distance between the indoor heat exchanger 50 and the fan assembly 80 to 136mm to 166mm, the angle between the air flowing through the windward side of the indoor heat exchanger 50 and the fan assembly 80 can be between 60° and 90°. This improves the flow of air along the windward side surface of the indoor heat exchanger 50, and reduces the vortex in the rear installation cavity 71 at the lower part of the indoor heat exchanger 50, so as to increase the air volume flowing through the indoor heat exchanger 50 per unit time, and improve the heat exchange efficiency of the indoor heat exchanger 50.

[0113] On this basis, if Fig. 9 As shown, when the indoor heat exchanger 50 is arranged in the installation cavity 71, the inclination ratio range K of the angle θ formed by the windward edge of the first connecting piece 521 and the front-to-back direction (i.e., the first straight line direction) and the opening angle α can be set to 6 / 17≤K=θ / α≤9 / 17. This allows more air flowing through the windward side of the indoor heat exchanger 50 to have an angle between 60° and 90°, thereby improving the flow of air along the windward surface of the indoor heat exchanger 50, such as allowing more air to flow directly forward into the gap between two adjacent first connecting pieces 521, and reducing the vortex in the installation cavity 71 at the rear of the lower part of the indoor heat exchanger 50, thereby increasing the air volume flowing through the indoor heat exchanger 50 per unit time and improving the heat exchange efficiency.

[0114] Combination Fig. 9 and Fig.13 , while keeping the speed of the fan assembly 80 and other dimensions of the indoor heat exchanger 50 unchanged, it can be known through simulation and comparison experiments that the air volume flowing through the indoor heat exchanger 50 per unit time gradually increases when the tilt ratio K of the indoor heat exchanger 50 installation increases from 6 / 17 to 9 / 17. Among them, when the tilt ratio increases from 6 / 17 to 7 / 17, the air volume growth rate flowing through the indoor heat exchanger 50 is small, and when the tilt ratio increases from 7 / 17 to 9 / 17, the air volume growth rate flowing through the indoor heat exchanger 50 is approximately the same.

[0115] For example, the air volume flowing through the indoor heat exchanger 50 when the tilt ratio is 6 / 17 is approximately 573m 3 / h, the air volume flowing through the indoor heat exchanger 50 when the tilt ratio is 7 / 17 is approximately 574m 3 / h, the air volume flowing through the indoor heat exchanger 50 when the tilt ratio is 8 / 17 is approximately 582.5m 3 / h, the air volume flowing through the indoor heat exchanger 50 when the tilt ratio is 9 / 17 is approximately 591.5m 3Based on this, the tilt ratio K of the indoor heat exchanger 50 during installation can also be set to: 6 / 17≤K<7 / 17, 7 / 17≤K<8 / 17 or 8 / 17≤K<9 / 17. In the above three value intervals, the air volume flowing through the indoor heat exchanger 50 can change linearly, and the air volume change rates in the latter two intervals are approximately the same.

[0116] Among them, in the installation cavity 71, since the indoor heat exchanger 50 needs to discharge condensed water downward, if the indoor heat exchanger 50 is set to have an inclination ratio less than 6 / 17, that is, the length of the second connecting piece 522 is larger and the length difference with the first connecting piece 521 is larger, it will cause the angle between the second connecting piece 522 and the up and down direction to be smaller, that is, the installation slope of the second connecting piece 522 is smaller, which is not conducive to the condensed water on the second connecting piece 522 flowing into the water receiving tray below it, that is, the drainage performance of the indoor unit is poor.

[0117] Correspondingly, if the inclination ratio of the indoor heat exchanger 50 is set to be greater than 9 / 17, that is, the length of the first connecting piece 521 is greater, and the angle θ between the windward edge of the first connecting piece 521 and the front-rear direction is smaller. Fig.11 and Fig.12 It can be seen from the wind field simulation experiment shown that more air will flow along the surface of the windward side of the indoor heat exchanger 50 and form vortices, thereby reducing the air volume flowing through the indoor heat exchanger 50.

[0118] Based on this, by setting the inclination ratio of the indoor heat exchanger 50 to 6 / 17≤K≤9 / 17 during installation, combined with Fig. 9 and Fig.14 , so that the first connecting piece 521 has a larger installation angle with the front-rear direction. In this way, at the windward side edge of the first connecting piece 521 ( Fig.14 In the area A in the middle, the air flow direction can form an angle between 60° and 90° with the windward edge of the indoor heat exchanger 50, thereby avoiding the air flowing along the windward surface of the indoor heat exchanger 50, which is beneficial to increasing the air circulation.

[0119] Exemplarily, when arranging the inclination ratio of the indoor heat exchanger 50 in the installation cavity 71, 1 / 2≤K≤9 / 17 may also be set, which is beneficial to improving the adaptation error range when assembling the indoor heat exchanger 50 and facilitating the assembly of the indoor unit.

[0120] Based on this, in the installation cavity 71, by coupling the parameters of the opening angle α and the tilt ratio K of the indoor heat exchanger 50, and the installation spacing L between the indoor heat exchanger 50 and the fan assembly 80, the configuration parameters can be configured as 80°≤α≤90°, 1 / 2≤K≤9 / 17 and 141mm≤L≤151mm. Fig.14 and Fig.15As shown in the wind field simulation diagram, the air flowing along the surface of the windward side of the indoor heat exchanger 50 is less and has less eddy currents, so that a larger air volume flows through the indoor heat exchanger 50 per unit time, thereby improving the overall heat exchange efficiency of the indoor unit.

[0121] Exemplarily, the installation spacing L between the indoor heat exchanger 50 and the fan assembly 80 can be configured to be 141mm, 143mm, 146mm, 148mm, 150mm and 151mm, the opening angle α of the indoor heat exchanger 50 can be configured to be 80°, 82 degrees, 85°, 87° and 90°, and the tilt ratio parameter K when the indoor heat exchanger 50 is installed can be configured to be 1 / 2, 35 / 68 and 9 / 17, etc. When installing the indoor heat exchanger 50 and the fan assembly 80, the value units of the above parameters can be configured separately in the installation cavity 71, or the tilt ratio parameter, the installation spacing parameter and the opening angle parameter can be configured at the same time, so that the indoor heat exchanger 50 and the indoor unit have better heat exchange efficiency, which is not limited to this.

[0122] For the tilt parameter K of the indoor heat exchanger 50, taking K=9 / 17 as an example, when the opening angle of the indoor heat exchanger 50 is 85°, the angle θ formed by the windward edge of the first connecting piece 521 and the front-rear direction can be configured to be 45°. While increasing the ventilation volume per unit time of the indoor unit, the heat exchange efficiency of the indoor heat exchanger 50 can also be improved.

[0123] It should be noted that if Figure 7 and Fig. 9 As shown, the fan assembly 80 may be a centrifugal fan, including a volute 82, a centrifugal impeller and a motor. The air outlet 81 of the volute 82 may be arranged near the top of the installation cavity 71, that is, the air outlet 81 may be arranged forward toward the first connecting piece 521, and two or more centrifugal fans may be arranged in the installation cavity 71 at intervals along the length direction of the indoor heat exchanger 50, so that the fan assembly 80 can drive a sufficient amount of air to flow through the indoor heat exchanger 50.

[0124] In addition, the fan assembly 80 may also be an axial flow fan structure, and the diameter of the axial flow fan may be smaller than the height of the installation cavity 71. Behind the indoor heat exchanger 50, one or more axial flow fans may be arranged near the top of the installation cavity 71, and the air outlets of the axial flow fans may be arranged toward the plurality of first connecting sheets 521, without limitation.

[0125] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0126] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A duct type air conditioner, comprising an indoor unit, characterized in that: The indoor unit comprises: A housing having a mounting cavity; Fan components; and an indoor heat exchanger, wherein the fan assembly and the indoor heat exchanger are located in the installation cavity and are spaced apart along a first straight line direction, and the fan assembly is used to drive air to flow through the indoor heat exchanger; Along the first straight line direction, the indoor heat exchanger is bent toward the fan assembly at two opposite ends in the second straight line direction, so that the indoor heat exchanger has an opening toward the fan assembly; The length direction of the indoor heat exchanger, the first straight line direction and the second straight line direction are perpendicular to each other; The side of the indoor heat exchanger along the first straight line direction facing the fan assembly is the windward side, and the indoor heat exchanger is configured as follows: When the air blown by the fan assembly toward the indoor heat exchanger flows through the windward side of the indoor heat exchanger, the flow direction of at least part of the air at this position forms an angle of 60° to 90° with the windward side of the indoor heat exchanger.

2. The duct type air conditioner according to claim 1, characterized in that: The value range of the opening angle α formed by bending the two ends of the indoor heat exchanger toward the fan assembly is: 75°≤α≤85°.

3. The duct type air conditioner according to claim 1, characterized in that: The value range of the opening angle α formed by bending the two ends of the indoor heat exchanger toward the fan assembly is: 85°<α≤95° or 95°<α≤105°.

4. The duct type air conditioner according to any one of claims 1 to 3, characterized in that: The indoor heat exchanger comprises: Multiple refrigerant pipes: and a plurality of fins, wherein the fins are an integrated sheet structure; the plurality of fins are spaced apart along the length direction of the indoor heat exchanger, and the refrigerant pipe vertically penetrates the plurality of fins along the length direction of the indoor heat exchanger and is in contact with and connected to the plurality of fins; The edge of the fin close to the fan assembly along the first straight line direction is its windward side edge; the fin includes: a first connecting piece; and a second connecting piece, wherein the second connecting piece is connected to the first connecting piece, and an angle formed by an edge of the windward side of the first connecting piece and an edge of the windward side of the second connecting piece is an opening angle of the indoor heat exchanger.

5. The duct type air conditioner according to claim 4, characterized in that: Along the second straight line direction, the air outlet of the fan assembly and the first connecting piece are arranged on the same side close to the installation cavity; and / or, The fan assembly is a centrifugal fan.

6. The duct type air conditioner according to claim 4, characterized in that: The value range of the inclination ratio K of the angle formed by the windward side edge of the first connecting piece and the first straight line direction to the opening angle is: 6 / 17≤K<7 / 17, 7 / 17≤K<8 / 17 or 8 / 17≤K≤9 / 17.

7. The duct type air conditioner according to claim 4, characterized in that: The inclination ratio of the angle formed by the windward edge of the first connecting piece and the first straight line direction to the opening angle is 1 / 2 to 9 / 17; and / or, The opening angle is 85°, and the angle formed by the windward edge of the first connecting piece and the first straight line direction is 45°.

8. The duct type air conditioner according to claim 4, characterized in that: The maximum distance L between the windward edge of the fin and the air outlet of the fan assembly in the first straight line direction has a value range of: 136mm≤L<146mm, 146mm≤L<156mm or 156mm≤L≤166mm.

9. The duct type air conditioner according to claim 4, characterized in that: The maximum distance between the windward edge of the fin and the air outlet of the fan assembly in the first straight line direction is 141 to 151 mm; and / or, The height dimension of the installation cavity in the second straight line direction is 185-195 mm.

10. The duct type air conditioner according to claim 4, characterized in that: The intersection of the windward side edge of the first connecting piece and the windward side edge of the second connecting piece is the vertex of the opening angle; or, The first connecting piece is connected to the second connecting piece through a chamfer or rounded structure.

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