Air conditioner with axial flow fan

Abstract

The invention discloses an air conditioner with an axial flow fan. The air conditioner aims to solve the problem that the air supply efficiency of the axial flow fan is reduced due to blade top air leakage. The air conditioner with the axial flow fan comprises a shell, a refrigerant heat exchanger and the axial flow fan, the refrigerant heat exchanger and the axial flow fan are located in a mounting cavity of the shell, and the axial flow fan is used for driving air to flow through the refrigerant heat exchanger. The axial flow fan comprises a motor and axial flow fan blades, the axial flow fan blades comprise a hub and a plurality of axial flow blades, the hub is used for being connected with an output shaft of the motor, and the multiple axial flow blades are distributed in the circumferential direction of the hub at intervals and connected with the hub. On the outer edge, away from the hub, of the axial flow blade, the radial distance between the end, close to the windward side, of the outer edge and the hub is larger than that between the end, close to the leeward side, of the outer edge and the hub, and the axial flow blade is used for reducing the blade top clearance at the outer edge. The axial flow fan of the air conditioner provided by the invention has relatively high air supply efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner provided with an axial flow fan. Background Art

[0002] 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. In the indoor unit or outdoor unit of the air conditioner, the rotation of the axial flow fan can drive the air to flow through the heat exchanger to improve the heat exchange efficiency between the heat exchanger and the surrounding environment.

[0003] The axial flow fan refers to a fan in which the fan blades make the air flow along the length direction of the fan blade shaft when the fan blades are working. The fan blades of the axial flow fan include a hub and a plurality of blades distributed at intervals in the circumferential direction around the hub.

[0004] During the rotation of the fan blades, a high-pressure airflow will be formed on the pressure surface of the blades. Along the radial direction of the fan blades, at the outer edge of the blades away from the hub, due to the limitation of the processing technology, there is a blade tip gap between the outer edge and the frame, which causes the high-pressure airflow on the pressure surface to leak through the blade tip gap, that is, the blade tip air leakage will reduce the air supply efficiency of the axial flow fan. Summary of the invention

[0005] The object of the present invention is to provide an air conditioner provided with an axial flow fan, aiming to solve the problem that air leakage at the blade tip reduces the air supply efficiency of the axial flow fan.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] The present invention provides an air conditioner with an axial flow fan, comprising a housing, a refrigerant heat exchanger and an axial flow fan, wherein the refrigerant heat exchanger and the axial flow fan are located in a mounting cavity of the housing, and the axial flow fan is used to drive air to flow through the refrigerant heat exchanger. The axial flow fan comprises a motor and axial flow blades, wherein the axial flow blades comprise a hub and a plurality of axial flow blades, wherein the hub is used to connect to an output shaft of the motor, and the plurality of axial flow blades are distributed at intervals along the circumference of the hub and are connected to the hub. Wherein, at the outer edge of the axial flow blade away from the hub, the radial distance between the end of the outer edge close to the windward side and the hub is greater than the radial distance between the end of the outer edge close to the leeward side and the hub, so as to reduce the blade tip clearance at the outer edge.

[0008] In some embodiments, the housing includes an air guide ring, the axial flow fan blade is located in the air guide ring, and the axial flow fan blade is spaced apart from the air guide ring in the radial direction of the air guide ring. At the outer edge of the axial flow blade away from the hub in the radial direction of the axial flow fan blade, the radial gap between the end of the outer edge close to the windward side and the air guide ring is smaller than the radial gap between the end of the outer edge close to the leeward side and the air guide ring.

[0009] In some embodiments, the outer edge includes a windward section, a leeward section, and a transition section. The windward section is located at one end of the outer edge close to the windward side, the leeward section is located at one end of the outer edge close to the leeward side, and the radial distance between the windward section and the hub is greater than the radial distance between the leeward section and the hub, and the transition section is located between the windward section and the leeward section and smoothly connects the two.

[0010] In some embodiments, the curve shape of the transition section includes a first curve

[0011] In some embodiments, the curve shape of the transition section includes a second curve

[0012] In some embodiments, the curve shape of the transition section includes a third curve

[0013] In some embodiments, the curve shape of the transition section includes a first curve, a second curve and a third curve. From the windward section to the leeward section, the first curve, the second curve and the third curve are sequentially connected to form a transition section, and the end of the first curve away from the second curve is connected to the windward section.

[0014] In some embodiments, along the axial direction of the axial flow blade, the vertical projection of the outer edge on the cross section is an outer arc line, and the cross section is a plane perpendicular to the axis of the axial flow blade;

[0015] In the cross section, the angle formed by the line connecting the two ends of the outer arc and the axis is the center angle of the outer arc. The center angle of the windward arc at the axis corresponding to the vertical projection of the windward section on the cross section accounts for 76% to 81% of the center angle of the outer arc, and the center angle of the leeward arc at the axis corresponding to the vertical projection of the leeward section on the cross section accounts for 13% to 18% of the center angle of the outer arc.

[0016] In some embodiments, the windward arc center angle accounts for 78.85% of the outer arc center angle, and the leeward arc center angle accounts for 15.35% of the outer arc center angle.

[0017] In some embodiments, between the outer edge and the hub, the edge of the axial flow blade close to the windward side along the circumference of the axial flow blade is the leading edge, and the edge of the axial flow blade close to the leeward side along the circumference of the axial flow blade is the trailing edge. From the hub to the outer edge, the length of the line between the trailing edge and the leading edge at the same length ratio is the primitive chord length of the axial flow blade. The primitive chord length of the axial flow blade is the length of the line between the leading edge and the trailing edge at the same ratio of arc length and radius size, and the primitive chord length of the axial flow blade increases first and then decreases.

[0018] In some embodiments, between the outer edge and the hub, the edge of the axial flow blade close to the windward side along the circumference of the axial flow blade is the leading edge, and the curved shape of the leading edge includes:

[0019] curve

[0020] curve

[0021] From the hub to the outer edge, the curve y4 and the curve y5 are connected in sequence to form the leading edge.

[0022] In some embodiments, the housing includes an air guide ring, which forms an air outlet connected to the installation cavity. At the outer edge of the axial flow blade, along the axial direction of the air guide ring, the leeward section is located inside the air guide ring, and the windward section close to the windward side is located between the air guide ring and the refrigerant heat exchanger.

[0023] Thus, at the air outlet of the indoor unit or outdoor unit housing, by arranging an axial flow blade with a larger radial dimension at one end of the outer edge close to the windward side, it is helpful to reduce the blade tip gap between the axial flow blade and the air outlet frame (such as the air guide ring), thereby reducing air leakage at the blade tip gap to increase the air outlet of the air conditioner. This is helpful to improve the air outlet efficiency of the air conditioner, thereby reducing the operating power consumption of the air conditioner.

[0024] Furthermore, the structural setting at the outer edge of the above-mentioned axial flow blades can reduce the leakage at the blade tip, thereby reducing the vortex and pressure pulsation at the outer edge and trailing edge of the axial flow blades, which is beneficial to improving the flocculation on the surface of the axial flow blades and the wake at their tails, thereby improving the aerodynamic efficiency of the axial flow fan and reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 A schematic diagram of a refrigerant flow path of an air conditioner provided in an embodiment of the present application;

[0027] Figure 2 A top view of an outdoor unit provided in an embodiment of the present application;

[0028] Figure 3 A front view of an outdoor unit provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of an exploded structure of an axial flow fan blade and a housing provided in an embodiment of the present application;

[0030] Figure 5for Figure 4 A three-dimensional structural schematic diagram of an axial flow fan blade shown in;

[0031] Figure 6 for Figure 4 A front view of the axial flow fan blades shown in the figure being installed in the air guide ring;

[0032] Figure 7 for Figure 6 A local enlarged schematic diagram of the middle A;

[0033] Figure 8 for Figure 6 A cross-sectional view along line BB;

[0034] Fig. 9 for Figure 8 A partial enlarged schematic diagram of point C in the middle;

[0035] Fig.10 It is the posture shape of a dolphin when entering and exiting the water;

[0036] Fig.11 for Figure 5 A front view of a hub and an axial flow blade shown in FIG.

[0037] Fig.12 for Figure 5 A side view of a hub and an axial flow blade is shown in;

[0038] Fig.13 A schematic diagram of the broken line relationship between the air volume and the speed of the axial flow fan before and after optimization;

[0039] Fig.14 A schematic diagram of the relationship between the noise and the speed of the axial flow fan before and after optimization;

[0040] Fig.15 A schematic diagram of the relationship between noise and air volume of the axial flow fan before and after optimization;

[0041] Fig.16 A schematic diagram of the broken line relationship between the power consumption and air volume of the axial flow fan before and after optimization.

[0042] Reference numerals:

[0043] 1000-air conditioner;

[0044] 10-compressor; 20-four-way valve; 30-outdoor heat exchanger; 40-pressure reducer; 50-indoor heat exchanger;

[0045] 200-outdoor unit;

[0046] 60-housing; 61-installation cavity; 62-air inlet; 63-air outlet; 64-air guide ring; 641-annular side plate; 642-speaker ring edge;

[0047] 70-axial flow fan; 71-motor; 72-axial flow fan blade; 721-hub; 7211-outer ring side; 7212-windward end face; 722-axial flow blade; 7221-outer edge; 72211-windward section; 72212-leeward section; 72213-transition section; 7222-inner edge; 7223-leading edge; 7224-trailing edge;

[0048] 300-Indoor unit. 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 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. Therefore, it should not be understood as a limitation to the present invention. Unless otherwise specified, the above-mentioned directional description can be flexibly set in the process of actual application under the condition of satisfying the relative positional relationship shown in the drawings.

[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 an air conditioner with an axial flow fan (hereinafter referred to as air conditioner 1000), the air conditioner 1000 may include a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, a pressure reducer 40 and an indoor heat exchanger 50. Exemplarily, 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 air end and an outlet air end, such as Figure 1 One end of the air flowing into the compressor 10 along the arrow direction is the return air end of the compressor, and the other end is the outlet air end of the compressor 10.

[0058] The return air end of the compressor 10 can be connected to the first port A of the four-way valve, the outlet air end 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 pressure reducer 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] Reference Figure 1 The air conditioner 1000 may include an outdoor unit 200 and an indoor unit 300. For example, the compressor 10, the four-way valve 20 and the outdoor heat exchanger 30 may be part of the outdoor unit 200, and the corresponding indoor heat exchanger 50 may be part of the indoor unit 300. The pressure reducer 40 may be a throttling device such as a capillary tube or an electronic expansion valve. The pressure reducer 40 may be Figure 1 As shown, the pressure reducer 40 is installed in the indoor unit 300. The pressure reducer 40 can also be installed in the indoor unit 300 and the outdoor unit 200. The pressure reducer 40 can also be installed in the refrigerant pipeline between the outdoor unit 200 and the indoor unit 300. It is only necessary to make the pressure reducer 40 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 300 and the outdoor unit 200 through the pipeline and produce a reversible phase change. While the refrigerant produces a phase change, it can release or absorb heat through the heat exchanger.

[0061] In this way, the refrigerant can exchange heat with the surrounding medium (such as air) in the outdoor unit 200 through the outdoor heat exchanger 30, thereby releasing heat and heating the surrounding air (or absorbing heat to cool the surrounding air). The refrigerant can exchange heat with the surrounding air in the indoor unit 300 through the indoor heat exchanger 50, thereby absorbing heat to cool the surrounding air (or releasing heat to heat the surrounding air), thereby achieving efficient cooling (or efficient heating) of the air conditioner 1000.

[0062] It should be noted that by adjusting the connection direction of the four-way valve 20, the air conditioner 1000 can be operated in a cooling state (such as Figure 1 The solid line flow direction of the refrigerant in the Figure 1 The function of the four-way valve 20 can also be replaced by other switching devices or flow paths, or the four-way valve is not required and the air conditioner 1000 is configured as a single cooling machine structure, which is not limited in this application.

[0063] In addition, for the air conditioner 1000, the outdoor heat exchanger 30 and the indoor heat exchanger 50 are both part of the refrigerant heat exchanger, that is, the refrigerant heat exchanger may include the indoor heat exchanger 50 and the outdoor heat exchanger 30. In the outdoor unit 200, the refrigerant heat exchanger may be used as the outdoor heat exchanger 30, and in the indoor unit 300, the refrigerant heat exchanger may be used as the indoor heat exchanger 50, which is not limited in the present application.

[0064] In some embodiments, Figure 2 As shown, Figure 2The top view of an outdoor unit 200 provided in an embodiment of the present application, the outdoor unit 200 may include a housing 60, an outdoor heat exchanger 30 (i.e., a type of refrigerant heat exchanger), and an axial flow fan 70, all of which are part of the air conditioner 1000. The housing 60 may enclose an installation cavity 61, and the housing 60 may also be provided with an air inlet 62 and an air outlet 63 connected to the installation cavity 61, the axial flow fan 70 may include a motor 71 and axial flow blades 72, and the axial flow fan 70 and the outdoor heat exchanger 30 are both located in the installation cavity 61.

[0065] It should be noted that, in the air conditioner 1000, an axial flow fan may also be arranged in the indoor unit 300 to drive air to flow through the indoor heat exchanger 50 (i.e., a type of refrigerant heat exchanger) and heat or cool the surrounding environment. In this case, the housing and the axial flow fan may also be regarded as part of the indoor unit 300 and the air conditioner 1000, and this application does not limit this.

[0066] Take outdoor unit 200 as an example, combined with Figure 2 , the side of the housing 60 provided with the air outlet 63 is defined as the front side, and the air inlet 62 can be opened on the housing 60 corresponding to the rear side and / or the left and right sides of the installation cavity 61. Exemplarily, the outdoor heat exchanger 30 can be arranged close to the air inlet 62, and the axial flow fan blades 72 can be connected to the output shaft of the motor 71, and the axial flow fan blades 72 can be arranged close to the air outlet 63.

[0067] In this way, the motor 71 can drive the axial flow fan blades 72 to rotate, and the air can be discharged from the installation cavity 61 through the air outlet 63, so that a negative pressure area can be formed in the installation cavity 61. The air on the rear side or the left and right sides of the shell 60 can flow into the installation cavity 61 through the air inlet 62. In this process, the air flowing into the installation cavity 61 from the air inlet 62 can exchange heat with the outdoor heat exchanger 30 when flowing through the outdoor heat exchanger 30, so that the indoor heat exchanger 50 can be efficiently cooled or heated, that is, the axis of the axial flow fan 70 can be parallel to the front-to-back direction or the left-to-right direction.

[0068] In addition, the air outlet 63 may also be arranged on the top side wall of the housing 60, and correspondingly, the air inlet 62 may be arranged on at least one of the front and rear side walls and the left and right side walls of the housing 60, taking the case where four air inlets 62 are arranged on the front and rear side walls and the left and right side walls of the housing 60 as an example. The outdoor heat exchanger 30 may be arranged on the inner side of the air inlet 62 close to the installation cavity 61, and the axial flow fan 70 may be located on the inner side of the outdoor heat exchanger 30 away from the air inlet 62, or the axial flow fan 70 may also be located above the four air inlets 62 and between the air outlet 63, for driving the air upward and discharged through the air outlet 63, that is, the axis of the axial flow fan 70 is parallel to the up and down direction.

[0069] In some embodiments, Figure 3 As shown, Figure 3A front view of an outdoor unit 200 provided in an embodiment of the present application, the axial flow blade 72 may include a hub 721 and a plurality of axial flow blades 722. Exemplarily, the plurality of axial flow blades 722 may be distributed along the circumference of the hub 721 at intervals and connected to the hub 721, such as three axial flow blades 722 may be distributed along the circumference of the hub 721 at a central angle of 120°, so that the axial flow blade 72 may rotate smoothly.

[0070] Taking the number of axial flow blades 722 as n, where n is a natural number greater than or equal to 2, the n axial flow blades 722 can be evenly distributed at a center angle of 360° / n along the circumference of the hub 721. For example, two axial flow blades 722 can be evenly distributed at a center angle of 180° along the circumference of the hub 721, or four axial flow blades 722 can be evenly distributed at a center angle of 90° along the circumference of the hub 721, which is conducive to improving the dynamic balance of the axial flow blades 72 when rotating.

[0071] by Figure 3 Taking the axial flow blade 72 in the embodiment as an example, the axial flow blade 72 is away from the mounting cavity 61 (such as Figure 2 The side (as shown) is the front side. During the rotation of the axial flow blade 72, a high-pressure airflow area will be formed on the pressure side (such as the front side) of the axial flow blade 722, and a low-pressure area will be formed on the suction side (such as the rear side) of the axial flow blade 722. Along the radial direction of the axial flow blade 72, at the outer edge of the axial flow blade 722 away from the hub 721, due to the limitations of the processing technology and the installation technology, there is a blade tip gap between the outer edge of the axial flow blade 722 and the frame of the shell 60 at the air outlet 63, which causes the high-pressure airflow on the pressure side to leak to the suction side through the blade tip gap (i.e., blade tip leakage).

[0072] like Figure 4 and Figure 5 As shown, Figure 5 for Figure 4 A three-dimensional structural diagram of the axial flow blade 72 is shown in FIG. 7 . In the radial direction of the axial flow blade 72 , the edge of the axial flow blade 722 away from the hub 721 is the outer edge 7221 , and the edge of the axial flow blade 722 that is in contact with the hub 721 is the inner edge 7222 . Figure 5 When the axial flow fan blade 72 shown rotates in a clockwise direction to drive the air to flow from back to front, along the circumference of the axial flow fan blade 72, at the two edges of the axial flow blade 722 between the outer edge 7221 and the inner edge 7222 (or the hub 721), the windward side edge of the axial flow blade 722 is the leading edge 7223, and the other side edge of the axial flow blade 722 (i.e., the leeward side edge) is the trailing edge 7224.

[0073] For example, the axis of the axial flow blade 72 is parallel to the front-to-back direction, and the air outlet 63, the axial flow fan 70, at least part of the outdoor heat exchanger 30 and at least one air inlet 62 are distributed in sequence from front to back, that is, the rear side of the axial flow blade 72 is the windward side, and the front side of the axial flow fan 222 is the leeward side, so that the rotating axial flow blade 72 can drive the air to flow quickly from back to front. In addition, along the circumference of the axial flow blade 72, for a single axial flow blade 722, the front side of the axial flow blade 722 during rotation can also be regarded as the windward side, and the rear side of the corresponding axial flow blade 722 can be regarded as the leeward side.

[0074] Based on this, in order to prevent the tip leakage from affecting the air supply efficiency of the axial flow fan 70, as shown in FIG. Figure 5 As shown, at the outer edge 7221 of the axial flow blade 722, the radial distance between the end of the outer edge 7221 close to the windward side and the hub 721 can be set to be greater than the radial distance between the end of the outer edge 7221 close to the leeward side and the hub 721. For example, when setting the profile at the outer edge 7221 of the axial flow blade 722, the end of the outer edge 7221 close to the windward side can be made to protrude away from the hub 721 in the radial direction, that is, the radial dimension of the end of the outer edge 7221 close to the windward side is larger, and the radial dimension of the end of the outer edge 7221 close to the leeward side is smaller.

[0075] Combination Figure 4 and Figure 5 At the air outlet 63 of the housing 60, by providing an axial flow blade 722 with a larger radial dimension at one end of the outer edge 7221 close to the windward side, it is helpful to reduce the blade tip gap between the axial flow blade 722 and the frame of the air outlet 63, thereby reducing air leakage at the blade tip gap to increase the air output of the axial flow fan 70 and the outdoor unit 200. It is helpful to improve the air output efficiency of the air conditioner 1000 such as the axial flow fan 70 and the outdoor unit 200, thereby reducing the operating power consumption of the air conditioner 1000.

[0076] It should be noted that, in the present application, the above-mentioned outer edge 7221 of the axial flow blade 722 is achieved by increasing the overall radial dimension of the axial flow blade 722 to meet the above-mentioned structural setting, such as increasing the radial dimension of the axial flow blade 722 at the outer edge 7221 near the leading edge 7223. In this way, the effective area of ​​the axial flow blade 722 is increased, which is also conducive to increasing the air output of the air conditioner 1000.

[0077] For the axial flow blade 722, due to the existence of gas viscosity, viscous resistance will be formed between the gas and the solid, thereby forming a flocculent boundary layer on the surface of the axial flow blade 722, and the thickness of the axial flow blade 722 itself will cause a wake to be formed at the tail of the axial flow blade 722 on the leeward side, thereby causing energy loss and reducing the aerodynamic efficiency of the axial flow fan 70.

[0078] However, the structural setting of the axial flow blade 722 at the outer edge 7221 can reduce the leakage of the blade tip, so that the vortex and pressure pulsation at the outer edge 7221 and the trailing edge 7224 of the axial flow blade 722 are also reduced, which is beneficial to improving the flocculation on the surface of the axial flow blade 722 and the wake of its tail, thereby improving the aerodynamic efficiency of the axial flow fan 70 and reducing noise.

[0079] In some embodiments, continue to refer to Figure 5 At the outer edge 7221 of the axial flow blade 722, the outer edge 7221 may include a windward section 72211, a leeward section 72212 and a transition section 72213. For example, the windward section 72211, the transition section 72213 and the leeward section 72212 may be sequentially connected to form the outer edge 7221 of the axial flow blade 722.

[0080] The windward section 72211 may be located at one end of the outer edge 7221 close to the windward side, such as one end of the windward section 72211 may be connected to one end of the transition section 72213, and the other end of the windward section 72211 may be connected to one end of the leading edge 7223 away from the hub 721. Correspondingly, the leeward section 72212 may be located at one end of the outer edge 7221 close to the leeward side, such as one end of the leeward section 72212 may be connected to one end of the transition section 72213 away from the windward section 72211, and the other end of the leeward section 72212 may be connected to one end of the trailing edge 7224 away from the hub 721.

[0081] In this way, the radial distance between the windward section 72211 and the hub 721 can be set to be greater than the radial distance between the leeward section 72212 and the hub 721, that is, the windward section 72211 can correspond to the structural edge of the axial flow blade 722 where its radial dimension increases. At the axial flow blade 722 corresponding to the leeward section 72212, its radial dimension can be kept unchanged, or the radial dimension at this position can be appropriately reduced, or the radial dimension at this position can be appropriately increased, as long as the radial distance between the windward section 72211 and the hub 721 is greater than the radial distance between the leeward section 72212 and the hub 721, and there is no limitation on this.

[0082] It should be noted that, for the windward section 72211 and the leeward section 72212, their structural shapes can be approximated as a spiral arc structure.

[0083] Exemplarily, in the axial direction of the axial flow blade 72, the windward section 72211 may have a windward end (such as the rear end) to connect the end of the leading edge 7223 away from the hub 721. The other end of the windward section 72211 along the axial direction of the axial flow blade 72 is a leeward end (such as the front end) to connect the windward end (such as the rear end) of the leeward section 72212 through the transition section 72213, and the leeward end (such as the front end) of the leeward section 72212 is connected to the end of the trailing edge 7224 away from the hub 721.

[0084] Furthermore, along the circumference of the axial flow blade 72, the rear end of the windward section 72211 can also be the windward end, and the front end of the leeward section 72212 can also be the leeward end.

[0085] In some embodiments, a plane perpendicular to the axis of the axial flow blade 72 may be defined as a cross section, and the vertical projection of the windward segment 72211 on the cross section may be an arc structure, and the center of the circle is located at the intersection of the axis and the cross section of the axial flow blade 72. The vertical projection of the leeward segment 72212 on the cross section may also be an arc structure, and the center of the circle is located at the intersection of the axis and the cross section of the axial flow blade 72.

[0086] For example, the projections of the leeward section 72212 and the windward section 72211 on the cross section may be partial arc structures on two concentric circles, that is, the radius sizes of the windward end and the leeward end of the windward section 72211 may be consistent, and the radius sizes of the windward end and the leeward end of the leeward section 72212 may be consistent.

[0087] Alternatively, the vertical projection of at least one of the windward segment 72211 and the leeward segment 72212 on the cross section may also be an arc structure. For example, the vertical projection of the leeward segment 72212 on the cross section may be an arc structure, and the vertical projection of the windward segment 72211 on the cross section may be an arc structure.

[0088] Exemplarily, the radial dimension of the windward section 72211 at the axis line may be gradually increased from the leeward end to the windward end. Alternatively, the radial dimension of the windward end of the windward section 72211 may be larger than the radial dimension of the leeward end.

[0089] In some embodiments, Figure 4 As shown, the housing 60 may further include an air guide ring 64. Taking the front side wall of the housing 60 as an example, the air guide ring 64 may be located at the rear side of the front side wall of the housing 60 and connected to the front side wall at the edge of the air outlet 63. Figure 6 At least the front end portion of the axial flow fan blade 72 can be set on the inner side of the air guide ring 64, that is, at the air outlet 63, so that the axial flow fan blade 72 is spaced apart from the air guide ring 64 along the radial direction of the air guide ring 64, thereby avoiding contact and friction between the axial flow fan blade 72 and the air guide ring 64 during rotation.

[0090] On this basis, if Figure 4 and Figure 5 As shown, at the outer edge 7221 of the axial flow blade 72, the radial dimension between the end of the outer edge 7221 close to the windward side and the air guide ring 64 can be set to be smaller than the radial dimension between the end of the outer edge 7221 close to the leeward side and the air guide ring 64.

[0091] Combination Figure 7 , Figure 7 for Figure 6 The partially enlarged schematic diagram of the area A in the middle shows that the outer edge 7221 (such as Figure 5 As shown in FIG. 1 , the radial gap between the windward section 72211 and the air guide ring 64 can be set to be smaller than the radial gap between the leeward section 72212 and the air guide ring 64. This increases the effective area of ​​the axial flow blade 72 and reduces the leakage area and air leakage at the blade top gap, which is beneficial to increasing the air output of the axial flow blade 72, thereby improving the aerodynamic efficiency of the axial flow blade 72 and reducing its noise.

[0092] Among them, at the outer edge 7221 between the windward section 72211 and the leeward section 72212, since the radial dimension of the windward section 72211 has a large mutation when changing to the radial dimension of the leeward section 72212, and the blade tip air leakage is mainly concentrated in the radial outer gap of the axial flow blade 722 corresponding to the leeward section 72212. Based on this, by providing a smoothly connected transition section 72213 between the windward section 72211 and the leeward section 72212, it is beneficial to reduce the contact resistance between the outer edge 7221 of the axial flow blade 722 and the air, thereby improving the efficiency of the axial flow fan blade 72.

[0093] In some embodiments, Figure 4 and Fig. 9 As shown, Fig. 9 for Figure 8 In the partially enlarged schematic diagram at C in the middle, the air guide ring 64 may include an annular side plate 641 and a horn ring edge 642. Along the axial direction (such as the front-to-back direction) of the axial flow fan blade 72, the annular side plate 641 may be connected to the rear side of the housing 60 and arranged around the air outlet 63, and the horn ring edge 642 may be located at the rear side of the annular side plate 641 and connected to the annular side plate 641.

[0094] The radial dimension of the end of the horn ring edge 642 close to the windward side (such as the rear end) can be set to be larger than the radial dimension of the end of the horn ring edge 642 close to the leeward side (such as the front side), so that the air guide ring 64 can form a trumpet shape with an opening that increases toward the windward side, so that air can flow smoothly through the air outlet 63, and it is beneficial to increase the air intake and air outlet at the air outlet 63, while reducing the noise when the air flows.

[0095] Based on this, along the axial direction of the air guide ring 64, the rear end (i.e., the end close to the windward side) of the axial flow blade 72 can be arranged between the air guide ring 64 and the outdoor heat exchanger 30, that is, the rear end of the axial flow blade 72 can be arranged to protrude backwards compared to the air guide ring 64. This is conducive to reducing the axial size of the air guide ring 64, thereby saving manufacturing materials.

[0096] In the above scheme, at the outer edge of the axial flow blade 722, the axial flow blade 722 corresponding to the leeward section 72212 can be arranged to be located in the air guide ring 64, that is, the vertical projection of this part of the axial flow blade 722 in the radial direction can be located on the air guide ring 64. Correspondingly, the rear end portion of the windward section 72211 can be located between the air guide ring 64 and the outdoor heat exchanger 30 in the front-to-back direction.

[0097] like Fig. 9 As shown, along the front-to-back direction, at the outer edge 7221 of the blade 722 (as shown in FIG. Figure 5 As shown in FIG. 1 , the axial flow blades 722 corresponding to the leeward section 72212 and the transition section 72213 may be located in the annular side plate 641, that is, the vertical projection of the axial flow blades 722 along the radial direction may be located on the annular side plate 641. The windward section 72211 may extend from the annular side plate 641 to the horn ring edge 642 or to the area between the air guide ring 64 and the outdoor heat exchanger 30 from front to back.

[0098] For example, along the radial direction of the air guide ring 64 , the radial gap between the leeward section 72212 of the axial flow blade 722 and the air guide ring 64 may be 6-12 mm, so as to facilitate the positioning and installation between the axial flow blade 72 and the air guide ring 64 .

[0099] At the windward section 72211 of the axial flow blade 722, the radial dimension between the windward section 72211 and the hub 721 may be increased by 2 to 20 mm compared to the radial dimension between the leeward section 72212 and the hub 721. The vertical projection of the leeward section 72212 on the cross section may be an arc line with equal radius, or the vertical projection of the leeward section 72212 on the cross section may be an arc line structure with unequal radius.

[0100] It should be noted that the radial dimension of the windward section 72211 and the axis can be set smaller than the inner diameter of the air guide ring 64, so that the radial gap between the windward section 72211 and the air guide ring 64 can be 2 to 4 mm. While increasing the blade area of ​​the axial flow blade 72, it is helpful to reduce the air leakage at the blade top and avoid the contact friction resistance between the axial flow blade 72 and the air guide ring 64 during the rotation process.

[0101] Alternatively, take the structural shape of the windward section 72211 whose radial dimension gradually increases from the front end to the rear end as an example:

[0102] In the portion of the windward section 72211 corresponding to the annular side plate 641, the radial dimension of the windward section 72211 and the axis (the axis of the axial flow fan 72) can be set to be smaller than the inner diameter of the annular side plate 641, such as the radial gap between the windward section 72211 and the annular side plate 641 can be 2-4 mm, so as to avoid the contact friction resistance between the axial flow blade 72 and the annular side plate 641 during the rotation process.

[0103] In the part of the windward section 72211 corresponding to the horn ring edge 642, the radial dimension of this part of the windward section 72211 at the axis can be set to be smaller than the inner diameter of the horn ring edge 642. For example, the radial gap size between the windward section 72211 and the horn ring edge 642 can be 2 to 4 mm, so as to avoid the contact friction resistance between the axial flow blade 72 and the annular side plate 641 during rotation.

[0104] Since the inner diameter of the speaker ring edge 642 increases gradually from front to back and is larger than the inner diameter of the annular side plate 641, the radial dimension of the windward section 72211 and the axis may also be larger than or equal to the inner diameter of the annular side plate 641. For example, in the portion of the windward section 72211 corresponding to the speaker ring edge 642, the radial dimension of the windward section 72211 and the axis may also be larger than or equal to the inner diameter of the annular side plate 641.

[0105] In addition, if the part of the axial flow blades 722 corresponding to the rear end of the windward section 72211 is located between the trumpet ring edge 642 and the outdoor heat exchanger 30 in the front-to-back direction, the radial dimension of the part of the windward section 72211 at the axis line can also be set to be greater than or equal to the maximum radial dimension of the trumpet ring edge 642, and the present application does not impose any limitation on this.

[0106] At the outer edge 7221 of the axial flow blade 722, due to the large change in the radial dimension of the transition section 72213 between the windward section 72211 and the leeward section 72212, the axial flow blade 722 has a large resistance at the transition section 72213 during the rotation along the axis. Based on this, the shape of the outer edge 7221 at the transition section 72213 is improved to reduce the resistance at the transition section 72213.

[0107] In some embodiments, the curve-shaped transition section 72213 may include at least one of a first curve y1, a second curve y2, and a third curve y3.

[0108] Among them, the shape of the first curve is:

[0109]

[0110] The shape of the second curve is:

[0111]

[0112] The shape of the third curve is:

[0113]

[0114] Exemplarily, from the windward section 72211 to the leeward section 72212, the first curve, the second curve and the third curve can be connected in sequence to form a curved transition section 72213, that is, the first curve can be connected to the third curve through the second curve, the end of the first curve away from the second curve can be connected to the windward section 72211, and the end of the third curve away from the second curve can be connected to the leeward section 72212.

[0115] Reference Fig.10 , Fig.10 It is a posture shape of a dolphin when it enters and leaves the water. Because dolphins have a better posture when they enter and leave the water, such as Fig.10 The curve posture at the lower abdomen of the middle dolphin can effectively reduce the water exit resistance and water entry resistance. Based on this, through the bionic simulation of the above curve posture, a curve model in which the first curve, the second curve and the third curve are connected in sequence can be obtained. By applying the curve model in which the first curve, the second curve and the third curve are connected in sequence to the transition section 72213, the air resistance at the transition section 72213 can be effectively reduced, which is beneficial to reducing the overall resistance of the axial flow fan 70 when rotating, thereby improving the efficiency of the fan blades.

[0116] In some other embodiments, the curve shape of the transition section 72213 may also include one or both of the first curve, the second curve and the third curve. For example, the windward section 72211 and the leeward section 72212 may be smoothly connected by the first curve combined with other curve structures to form the transition section 72213, and so on, which is not limited in the present application.

[0117] like Fig.11 As shown, Fig.11 for Figure 5 The front view of the hub 721 and the axial flow blade 722 shown in FIG. 1 is a cross section of the plane perpendicular to the axis of the axial flow blade 72. Fig.11 The front view shown can be regarded as a vertical projection of the axial flow blade 72 on one of the cross sections.

[0118] In the cross section, an outer edge 7221 (such as Figure 5 The vertical projection of the cross section is an outer arc line, and the angle formed by the connecting line between the two ends of the outer arc line and the axis (i.e., the intersection of the arc line and the cross section) is the outer arc heart angle β. The windward section 72211 (as shown in FIG. Fig.11The windward arc center angle α1 at the axis corresponding to the vertical projection on the cross section accounts for 76% to 81% of the outer arc center angle β, and the leeward arc center angle α2 at the axis corresponding to the vertical projection on the cross section of the leeward segment 72212 accounts for 13% to 18% of the outer arc center angle β.

[0119] like Figure 5 and Fig.11 As shown, the two intersection points of the outer edge 7221 and the leading edge 7223 and the trailing edge 7224 are arranged one by one with the two ends of the outer arc along the axial direction. The axis is the central axis of the axial flow blade 72, which can also be Fig.11 The center position of the hub 721 shown in FIG. In the cross section, the vertical projections of the windward section 72211, the transition section 72213 and the leeward section 72212 on the cross section are sequentially connected to the first arc, the third arc and the second arc. The angle formed by the two ends of the first arc and the line at the axis can be taken as the windward arc center angle α1, the corresponding angle formed by the two ends of the second arc and the line at the axis is the leeward arc center angle α2, and the angle formed by the two ends of the third arc and the line at the axis is the transition arc center angle α3.

[0120] Since the windward arc center angle α1 accounts for 76% to 81% of the outer arc center angle β, and the leeward arc center angle α2 accounts for 13% to 18% of the outer arc center angle β, the transition arc center angle α3 can be set to account for 4% to 8% of the outer arc center angle β. The extended length dimensions of the windward section 72211, the transition section 72213, and the leeward section 72212 can be obtained through the above parameters, which are used to manufacture the axial flow fan blade 72 that takes into account both increasing the air volume and reducing the wind noise.

[0121] Exemplarily, the ratio of the windward arc center angle α1 to the outer arc center angle β can be 76%, 77%, 78%, 79%, 80% or 81%, the ratio of the leeward arc center angle α2 to the outer arc center angle β can be 13%, 14%, 15%, 16%, 17% or 18%, and the ratio of the transition arc center angle α3 to the outer arc center angle β can be 4%, 5%, 6%, 7% or 8%. The length dimensions of the windward section 72211, the transition section 72213 and the leeward section 72212 can be flexibly adjusted in combination with the above scheme.

[0122] For example, through simulation tests, it can be known that when the ratio of the windward arc center angle α1 to the outer arc center angle β is 78.85%, the ratio of the leeward arc center angle α2 to the outer arc center angle β is 15.35%, and the ratio of the transition arc center angle α3 to the outer arc center angle β is 5.8%, the length dimensions of the windward section 72211, the transition section 72213 and the leeward section 72212 are designed and the corresponding axial flow fan blades 72 are manufactured, so that the axial flow fan blades 72 have a better effect of increasing the air volume, and the effect of reducing wind noise is more obvious.

[0123] In some embodiments, Figure 5As shown, between the outer edge 7221 of the axial flow blade 722 and the hub 721, the edge of the axial flow blade 722 close to the windward side along the circumference or axial direction of the axial flow blade 72 is the leading edge 7223, and the edge of the axial flow blade 722 close to the leeward side along the circumference or axial direction of the axial flow blade 72 is the trailing edge 7224. The primitive chord length of the axial flow blade 722 can be defined as the length of the line between the leading edge 7223 and the trailing edge 7224 at the same length ratio position, and from the hub 222 (i.e., the inner edge 7222) to the outer edge 7221, the primitive chord length of the axial flow blade 722 can first increase and then decrease, which is beneficial to improving the air supply efficiency of the axial flow blade 72 and reducing the air supply noise.

[0124] For example, the primitive chord length of the line connecting the two ends at the intersection of the inner edge 7222 and the leading edge 7223 and the trailing edge 7224 is taken as 0% of the primitive chord length L1 of the axial flow blade 722, and the primitive chord length of the line connecting the two ends at the intersection of the outer edge 7221 and the leading edge 7223 and the trailing edge 7224 is taken as 100% of the primitive chord length L2 of the axial flow blade 722. From the hub 721 to the outer edge 7221, the line connecting the two ends of the leading edge 7223 and the trailing edge 7224 at the 50% length ratio position is the 50% primitive chord length L3 of the axial flow blade 722, the line connecting the two ends of the leading edge 7223 and the trailing edge 7224 at the 25% length ratio position is the 25% primitive chord length L4 of the axial flow blade 722, and the line connecting the two ends of the leading edge 7223 and the trailing edge 7224 at the 75% length ratio position is the 75% primitive chord length L5 of the axial flow blade 722.

[0125] Based on this, the shape and size of the leading edge 7223 and the trailing edge 7224 of the axial flow blade 722 can be set to satisfy L3>L5>L2 and L3>L4>L1, which is beneficial to improving the air supply efficiency of the axial flow fan blade 72 and reducing the air supply noise.

[0126] In some embodiments, the curve shape of the leading edge 7223 of the axial flow blade 722 may include a curve y1 and a curve y2, and the curve y1 and the curve y2 are sequentially connected from the inner edge 7222 to the outer edge 7221 to form a shape curve of the leading edge 7223. Wherein:

[0127]

[0128]

[0129] Exemplarily, the portion of the leading edge 7223 between the intersection point of 50% of the primitive chord length and the inner edge 7222 can be set as curve y1, and correspondingly, the other portion of the leading edge, that is, the portion of the leading edge 7223 between the intersection point of 50% of the primitive chord length and the outer edge 7221 can be set as curve y2.

[0130] Correspondingly, the trailing edge 7224 of the axial flow blade 722 needs to be optimized to meet L3>L5>L2 and L3>L4>L1, so as to improve the air supply efficiency of the axial flow blade 72 and reduce the air supply noise. Alternatively, the basic chord length of the axial flow blade 722 increases first and then decreases from the hub 721 to the outer edge 7221, so as to improve the air supply efficiency of the axial flow blade 72 and reduce the air supply noise.

[0131] For example, the windward end surface 7212 of the hub 721 is connected to the outer ring side surface 7211 through a rounded structure. Fig.12 As shown, along the axial direction (such as the front-to-back direction) of the axial flow blade 72, the height dimension of the hub 721 is defined as H, and the radius dimension corresponding to the 1 / 4 fillet structure is r. For example, the height dimension of the hub 721 can be set to H=85mm, and the radius dimension of the fillet structure at the hub 721 is r=48.87mm.

[0132] It should be noted that the air guide ring 64 and the housing 60 can both be made of metal materials, and the axial flow blades 72 can be made of plastics such as polypropylene or ABS (Acrylonitrile Butadiene Styrene plastic).

[0133] For example, the air guide ring 64 is made of iron alloy, and the axial flow blades 72 are made of plastic. The axial width of the air guide ring 64 can be 120 mm, and the diameter of the air guide ring 64 can be 620 mm. Correspondingly, the number of axial flow blades 722 is three, and the diameter of the axial flow blades 72 is D=600 mm.

[0134] Based on this, it can be known from the simulation test of the axial flow fan 70 before and after the optimization that:

[0135] Before optimization, the static pressure of the axial flow fan 70 and the air guide ring 64 at a speed of 730 rpm is 45 Pa, the power consumption of the axial flow fan 70 is 176.5 W, and the air volume at the air outlet 63 is 5480 m 3 / h, that is, the static pressure efficiency of the axial flow fan 70 before optimization is 38%.

[0136] The static pressure of the optimized axial flow fan 70 and the air guide ring 64 is 45Pa at a rotation speed of 730rpm, and the power consumption of the axial flow fan 70 is 165.4W, but the air volume at the air outlet 63 is 5490m 3 / h, and the static pressure efficiency of the optimized axial flow fan 70 is 40%.

[0137] Obviously, by performing the above optimization on the axial flow fan 70 and the air guide ring 64, the efficiency of the axial flow fan 70 can be significantly improved, the air volume can be increased at the same rotation speed, the power consumption can be reduced by about 10W, and the wind noise can also be reduced.

[0138] For example, after optimizing the design of the axial flow blades 72 and the air guide ring 64 through the above-mentioned structural materials and structural dimensions, through simulation tests, as shown in Table 1, the speed, air volume, power consumption, noise and other parameters of the axial flow fan 70 before and after optimization can be compared and analyzed.

[0139] Table 1

[0140]

[0141] By analyzing the speed and air volume parameters in Table 1, we can see that Fig.13 As shown, Fig.13 This is a schematic diagram of the broken line relationship between the air volume and speed of the axial flow fan before and after optimization. Obviously, the air volume of the improved axial flow fan at the same speed is increased.

[0142] By analyzing the speed, air volume and noise parameters in Table 1, we can see that Fig.14 and Fig.15 As shown, Fig.14 A schematic diagram of the relationship between the noise and speed of the axial flow fan before and after optimization. Fig.15 The figure is a schematic diagram of the relationship between the noise and air volume of the axial flow fan before and after optimization. At the same speed, the noise of the improved axial flow fan can be reduced by 1-3dB(A), and at the same air volume, the noise of the improved axial flow fan can be reduced by 1-2dB(A), that is, the noise reduction effect of the improved axial flow fan is obvious.

[0143] By analyzing the air volume and power consumption parameters in Table 1, we can see that Fig.16 As shown, Fig.16 This is a schematic diagram of the relationship between the power consumption and air volume of the axial flow fan before and after optimization. Obviously, the power consumption of the improved axial flow fan is reduced to varying degrees at the same air volume. Especially when the air volume exceeds 3500m 3 / h, the power consumption of the optimized axial flow fan can be reduced by more than 4W, which has a significant improvement on the power consumption ratio of the axial flow fan.

[0144] It should be noted that the above-mentioned axial flow fan 70 and the adapted air guide ring 64 can be applied to the outdoor unit 200, and can also be applied and set at the indoor unit 300 of the corresponding structure. The efficiency of the axial flow fan 70 can also be improved, such as increasing the air volume at the same speed, reducing power consumption and reducing wind noise, which is not limited in this application.

[0145] 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.

[0146] 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. An air conditioner equipped with an axial flow fan, characterized in that: include: A housing having a mounting cavity; A refrigerant heat exchanger, wherein the refrigerant heat exchanger is located in the installation cavity; and an axial flow fan, the axial flow fan being located in the installation cavity and being used for driving air to flow through the refrigerant heat exchanger; The axial flow fan comprises: Motor; and an axial flow fan blade, wherein the axial flow fan blade comprises: A wheel hub, the wheel hub being used to connect to an output shaft of a motor; and a plurality of axial flow blades, the plurality of axial flow blades being distributed at intervals along the circumference of the hub and connected to the hub; Wherein, at the outer edge of the axial flow blade away from the hub, the radial distance between the end of the outer edge close to the windward side and the hub is greater than the radial distance between the end of the outer edge close to the leeward side and the hub, so as to reduce the blade tip clearance at the outer edge.

2. The air conditioner with an axial flow fan according to claim 1, characterized in that: The outer edge includes: A windward section, the windward section is located at one end of the outer edge close to the windward side; A leeward section, the leeward section is located at one end of the outer edge close to the leeward side, and a radial distance between the windward section and the hub is greater than a radial distance between the leeward section and the hub; and a transition section, wherein the transition section is located between the windward section and the leeward section and is smoothly connected to the two sections.

3. The air conditioner with an axial flow fan according to claim 2, characterized in that: The curve shape of the transition section includes: First Curve (0.666774≤x1≤10.84265); and / or, The second curve (10.84265≤x2≤49.906286083); and / or, The third curve (49.906286083≤x3≤58.208570544).

4. The air conditioner with an axial flow fan according to claim 3, characterized in that: In the case where the curve shape of the transition section includes a first curve, a second curve and a third curve: From the windward section to the leeward section, the first curve, the second curve and the third curve are sequentially connected to form the transition section, and one end of the first curve away from the second curve is connected to the windward section.

5. The air conditioner equipped with an axial flow fan according to any one of claims 2 to 4, characterized in that: Along the axial direction of the axial flow fan blade, the vertical projection of the outer edge on the cross section is an outer arc line, and the cross section is a plane perpendicular to the axis of the axial flow fan blade; In the cross section, the angle formed by the two ends of the outer arc and the line connecting the axis is the center angle of the outer arc, the vertical projection of the windward segment on the cross section corresponds to the center angle of the windward arc at the axis, which accounts for 76% to 81% of the center angle of the outer arc, and the vertical projection of the leeward segment on the cross section corresponds to the center angle of the leeward arc at the axis, which accounts for 13% to 18% of the center angle of the outer arc.

6. The air conditioner with an axial flow fan according to claim 5, characterized in that: The windward arc center angle accounts for 78.85% of the outer arc center angle, and the leeward arc center angle accounts for 15.35% of the outer arc center angle.

7. An air conditioner equipped with an axial flow fan according to any one of claims 1 to 4, characterized in that: Between the outer edge and the hub, the edge of the axial flow blade close to the windward side along the circumference of the axial flow blade is the leading edge, and the edge of the axial flow blade close to the leeward side along the circumference of the axial flow blade is the trailing edge; From the hub to the outer edge, the length of the line between the leading edge and the trailing edge at the same length ratio position is the primitive chord length of the axial flow blade. The primitive stage chord length of the axial flow blade is the length of the line between the leading edge and the trailing edge at the radius dimension at the same ratio of arc length, and the primitive stage chord length of the axial flow blade first increases and then decreases.

8. An air conditioner equipped with an axial flow fan according to any one of claims 1 to 4, characterized in that: Between the outer edge and the hub, the edge of the axial flow blade close to the windward side along the circumference of the axial flow fan blade is the leading edge, and the curved shape of the leading edge includes: curve (247.0999234≤x4≤264.5592876); curve (245.7355578≤x5≤264.5592876); From the wheel hub to the outer edge, the curve y4 and the curve y5 are sequentially connected to form the leading edge.

9. An air conditioner equipped with an axial flow fan according to any one of claims 2 to 4, characterized in that: The housing comprises: An air guide ring, the air guide ring enclosing an air outlet connected to the installation cavity; At the outer edge of the axial flow blade, along the axial direction of the air guide ring, the leeward section is located inside the air guide ring, and the windward section close to the windward side is located between the air guide ring and the refrigerant heat exchanger.

10. An air conditioner equipped with an axial flow fan, characterized in that: include: A housing having a mounting cavity; A refrigerant heat exchanger, wherein the refrigerant heat exchanger is located in the installation cavity; and an axial flow fan, the axial flow fan being located in the installation cavity and being used for driving air to flow through the refrigerant heat exchanger; The axial flow fan comprises: Motor; and an axial flow fan blade, wherein the axial flow fan blade comprises: A wheel hub, the wheel hub being used to connect to an output shaft of a motor; and a plurality of axial flow blades, the plurality of axial flow blades being distributed at intervals along the circumference of the hub and connected to the hub; Wherein, the shell includes an air guide ring, the axial flow fan blades are located in the air guide ring, and the axial flow fan blades are spaced apart from the air guide ring along the radial direction of the air guide ring; at the outer edge of the axial flow blades away from the hub along the radial direction of the axial flow fan blades, the radial gap between the end of the outer edge close to the windward side and the air guide ring is smaller than the radial gap between the end of the outer edge close to the leeward side and the air guide ring.

Images