Axial flow fan blade and air conditioner

Abstract

The invention provides an axial flow fan blade and an air conditioner, and relates to the technical field of air conditioning equipment. The axial flow fan blade comprises a main blade and an auxiliary blade; the auxiliary blade is movably arranged on the main blade, and the auxiliary blade can move relative to the main blade so as to be in a maximum unfolding state and a maximum stacking state. Under the condition that the rotating speed of the motor is small, the auxiliary blades move relative to the main blades to form a maximum stacking device, and therefore low-air-volume air outlet is achieved. And under the condition that the rotating speed of the motor is slightly increased, the auxiliary blades move relative to the main blades to be in the maximum unfolding state, so that the blade area is increased, and high-air-volume air outlet is achieved. Therefore, under the condition that the rotating speed of the motor is slightly changed, the auxiliary blades can stretch out or retract relative to the main blades, so that the air volume is greatly increased or reduced, and the motor is ensured to operate in a high-energy-efficiency state.

Description

Technical Field

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

[0002] At present, the air volume of the air conditioner outdoor unit can be adjusted by controlling the speed of the outdoor unit motor. In order to meet different heat exchange requirements, the air conditioner outdoor unit usually needs to be set with a larger air volume adjustment range, that is, a larger speed range of the outdoor unit motor is set.

[0003] However, the relationship between motor efficiency and speed is roughly parabolic in the coordinate system. Since the motor speed range of the existing air-conditioning outdoor unit is too large, the motor energy efficiency will be low when the motor speed is too high or too low. Summary of the invention

[0004] The present invention provides an axial flow fan blade and an air conditioner, which can realize a significant increase or decrease in the air volume within a relatively small rotation speed range of a motor, so as to ensure that the motor operates in a high energy efficiency state.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides an axial flow fan blade, comprising a main blade and an auxiliary blade;

[0007] The auxiliary blade can be movably arranged on the main blade, and the auxiliary blade can move relative to the main blade to be in a maximum expansion state and a maximum stacking state.

[0008] In the above embodiment, when the motor speed is low, the auxiliary blades move relative to the main blades to form a maximum stacking device, thereby achieving low air volume output; and when the motor speed increases slightly, the auxiliary blades move relative to the main blades to form a maximum expansion state, thereby increasing the blade area and achieving high air volume output. Therefore, when the motor speed changes slightly, the auxiliary blades can be extended or retracted relative to the main blades, thereby achieving a significant increase or decrease in air volume, thereby ensuring that the motor operates in a high energy efficiency state.

[0009] In an optional embodiment, in the maximum deployed state, the windward area of ​​the main blade and the secondary blade is equal to the sum of the areas of the main blade and the secondary blade.

[0010] In the above embodiment, the windward area of ​​the axial flow fan blade is effectively increased by making the windward area the sum of the areas of the primary and secondary blades in the maximum expanded state, thereby increasing the air output.

[0011] In an optional embodiment, in the maximum stacking state, the windward areas of the main blade and the auxiliary blade are equal to the area of ​​the main blade.

[0012] In the above embodiment, the windward area of ​​the axial flow fan blades is effectively reduced by making the windward area in the most stacked state only the area of ​​the main blades, thereby reducing the air output.

[0013] In an optional embodiment, the axial flow fan blade further includes a reset member, wherein the reset member is connected to the auxiliary blade, and the reset member is used to enable the auxiliary blade to have a movement tendency to recover from the maximum expanded state to the maximum stacked state.

[0014] In the above embodiment, a reset member is provided so that the auxiliary blades are always maintained in the maximum stacking state when the motor is not started or the speed is low, so as to ensure that the axial flow fan blades maintain low air volume operation; after the speed of the motor increases, the auxiliary blades temporarily overcome the force of the reset member and are converted from the maximum stacking state to the maximum expanded state, so as to achieve the purpose of increasing the working area of ​​the blades; when the motor speed is reduced from a higher speed to a lower speed, the reset member drives the auxiliary blades from the maximum expanded state to the maximum stacking state, so as to reduce the working area of ​​the blades; in this way, the motor only needs to adjust a smaller speed to achieve the operation of the axial flow fan blades with a smaller air volume or a larger air volume.

[0015] In an optional embodiment, the axial flow fan blade further includes a hub, the main blade is fixedly disposed on the hub, the auxiliary blade is movably disposed on the hub, and the reset member is disposed on the hub.

[0016] In the above embodiment, the reset member and the auxiliary blade are arranged on the hub to improve the stability of the movement of the auxiliary blade relative to the main blade.

[0017] In an optional embodiment, the outer wall of the hub is provided with a second accommodating groove, the auxiliary blade is at least partially accommodated in the second accommodating groove, and the reset member is arranged in the second accommodating groove and connected to the auxiliary blade.

[0018] In the above embodiment, a reset member is provided so that the auxiliary blade is always hidden and accommodated in the first receiving groove of the main blade when the motor is not started or the speed is low, so as to ensure that the axial flow fan blade maintains low air volume operation; and after the speed of the motor increases, the auxiliary blade temporarily overcomes the force of the reset member and extends out of the first receiving groove to achieve the purpose of increasing the working area of ​​the blade; when the motor speed is reduced from a higher speed to a lower speed, the reset member drives the second fan blade to retract from outside the first receiving groove to inside the first receiving groove to reduce the working area of ​​the blade.

[0019] In an optional embodiment, the reset member is a spring, and the reset member is located in the second accommodating groove at one end away from the main blade, with one end of the reset member abutting against the side wall of the second accommodating groove and the other end abutting against the auxiliary blade.

[0020] In the above embodiment, when the motor is not running or is in a low speed state, the auxiliary blade is located in the accommodating groove, and the reset member is in a free state or a compressed state; after the speed of the motor increases slightly, the sliding part overcomes the spring pressure of the reset member and drives the blade body to extend out of the first accommodating groove; after the speed of the motor decreases, the sliding part retracts into the second accommodating groove under the action of the elastic restoring force of the reset member, and drives the blade body to retract into the first accommodating groove.

[0021] In an optional embodiment, the auxiliary blade includes a blade body and a sliding portion that are connected to each other, the sliding portion can perform a circular motion around the axis of the hub in the second accommodating groove, and the reset member is connected to the sliding portion.

[0022] In the above embodiment, the second receiving groove and the sliding part are both arc-shaped, and the sliding part is concentrically arranged with the hub, so that the sliding part can rotate in a circular motion around the axis of the hub, thereby driving the blade body to slide smoothly to extend or retract the first receiving groove.

[0023] In an optional embodiment, in the maximum stacking state, the main blades and the auxiliary blades are arranged overlappingly.

[0024] In the above embodiment, in the maximum stacking state, the main blades and the auxiliary blades are overlapped, the structure is simple, and it is easy to implement.

[0025] In an optional embodiment, the main blade is provided with a first accommodating groove, which is used to accommodate the auxiliary blade, and the auxiliary blade can extend out of the first accommodating groove to present the maximum expanded state, or the auxiliary blade can retract into the first accommodating groove to present the maximum stacked state.

[0026] In the above embodiment, a first receiving groove is provided on the main blade so that the auxiliary blade is hidden and accommodated in the receiving groove of the first fan blade when the motor is at a low speed. This ensures the aesthetic appearance of the axial flow fan blade without affecting the disturbance of the airflow by the main blade, thereby avoiding affecting the air volume.

[0027] In an optional embodiment, the main blade includes a trailing edge, the trailing edge is a straight line, and the opening of the first accommodating groove is arranged at the trailing edge.

[0028] In the above embodiment, the side of the auxiliary blade is also straight, and the auxiliary blade extends from the straight trailing edge, which can effectively increase the blade area and make the structure of the auxiliary blade convenient to process.

[0029] In an optional embodiment, the main blade comprises a leading edge, and the leading edge is arc-shaped.

[0030] In the above embodiment, the air output can be ensured by setting the leading edge of the main blade to be arc-shaped.

[0031] In an optional embodiment, a limiting portion is provided on the edge of the auxiliary blade, and the limiting portion is used to abut against the edge of the main blade.

[0032] In the above embodiment, the limiting portion abuts against the trailing edge of the main blade to prevent the second fan blade from being completely retracted into the receiving groove of the main blade and to prevent the auxiliary blade from being stuck in the main blade.

[0033] In a second aspect, the present invention provides an air conditioner, comprising an indoor unit and an outdoor unit, wherein the indoor unit and the outdoor unit are connected by a pipe, and the outdoor unit comprises an axial flow fan blade as described in any one of the aforementioned embodiments, wherein the axial flow fan blade is mounted at a motor bracket of the outdoor unit and rotates at an air guide ring of the outdoor unit.

[0034] The beneficial effects of the axial flow fan blade and the air conditioner provided by the embodiment of the present invention include: when the motor speed is low, the auxiliary blade moves relative to the main blade to form a maximum stacking device, thereby achieving low air volume output; and when the motor speed increases slightly, the auxiliary blade moves relative to the main blade to form a maximum expansion state, thereby increasing the blade area and achieving high air volume output. Therefore, when the motor speed changes slightly, the auxiliary blade can be extended or retracted relative to the main blade, thereby achieving a significant increase or decrease in air volume, thereby ensuring that the motor operates in a high energy efficiency state. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 An exploded view of an axial flow fan blade provided in an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the structure of an axial flow fan blade provided in an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of the auxiliary blade structure provided in an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the structure of an axial flow fan blade in a retracted state from a first viewing angle provided by an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of the structure of the axial flow fan blade in a retracted state from a second viewing angle provided by an embodiment of the present invention;

[0041] Figure 6 A schematic diagram of the structure of an axial flow fan blade in an extended state from a first perspective provided by an embodiment of the present invention;

[0042] Figure 7 A schematic diagram of the structure of the axial flow fan blades in the extended state from a second viewing angle provided by an embodiment of the present invention.

[0043] Icons: 10-axial flow fan blade; 100-hub; 110-second receiving groove; 120-opening; 200-main blade; 210-first receiving groove; 220-leading edge; 230-trailing edge; 300-auxiliary blade; 310-limiting part; 320-blade body; 330-sliding part; 400-resetting member; 500-cover plate. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0049] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0050] At present, the air volume of the air conditioner outdoor unit can be adjusted by controlling the speed of the outdoor unit motor. In order to meet different heat exchange requirements, the air conditioner outdoor unit usually needs to set a larger air volume adjustment range, that is, set a larger speed range of the outdoor unit motor. For example, setting the motor speed of the air conditioner outdoor unit to 400r / min~900r / min can make the air volume of the air conditioner outdoor unit reach 1000m 3 / h~2250m 3 / h.

[0051] However, the relationship between motor efficiency and speed is roughly parabolic in the coordinate system. Since the motor speed range of the existing air-conditioning outdoor unit is too large, the motor energy efficiency will be low when the motor speed is too high or too low.

[0052] Based on the above problems, the present invention provides an air conditioner, which can achieve a larger air volume adjustment range with a smaller motor speed range, for example, when the motor speed is 700r / min to 900r / min, the air volume adjustment range can reach 1000m 3 / h~2250m 3 / h.

[0053] It is understood that the air conditioner includes an indoor unit and an outdoor unit, the indoor unit and the outdoor unit are connected by a pipeline, and the outdoor unit includes an axial flow fan blade, which is installed at the motor bracket of the outdoor unit and rotates at the air guide ring of the outdoor unit. The axial flow fan blade can achieve a large change in air volume when the motor speed changes slightly.

[0054] See also Figures 1 to 7 The axial flow fan blade 10 includes a hub 100, a main blade 200 and an auxiliary blade 300. The hub 100 is used to be installed on a motor (not shown) to drive the hub 100 to rotate through the motor, and the hub 100 drives the main blade 200 and the auxiliary blade 300 to rotate, thereby achieving the function of wind outlet.

[0055] In detail, the main blade 200 is fixedly arranged on the hub 100, and the auxiliary blade 300 is movably arranged on the hub 100. The auxiliary blade 300 can move relative to the main blade 200 and has two limit states, which are the maximum expansion state and the maximum stacking state. In the maximum expansion state, the auxiliary blade 300 extends relative to the main blade 200, and in the maximum stacking state, the auxiliary blade 300 retracts relative to the main blade 200.

[0056] It can be understood that the windward area of ​​the main blade 200 and the auxiliary blade 300 during operation is greater than or equal to the area of ​​the main blade 200, and less than or equal to the sum of the areas of the main blade 200 and the auxiliary blade 300. Therefore, in the maximum deployment state, the windward area of ​​the main blade 200 and the auxiliary blade 300 is equal to the sum of the areas of the main blade 200 and the auxiliary blade 300; and in the maximum stacking state, the windward area of ​​the main blade 200 and the auxiliary blade 300 is equal to the area of ​​the main blade 200.

[0057] In this embodiment, when the motor speed is relatively low, the auxiliary blade 300 retracts relative to the main blade 200, that is, the blade area of ​​the auxiliary blade 300 coincides or overlaps with the blade area of ​​the main blade 200. At this time, only the blade area of ​​the main blade 200 disturbs the airflow and achieves low air volume output; when the motor speed is slightly increased, the auxiliary blade 300 can be extended relative to the main blade 200, that is, the auxiliary blade 300 is used as an extension of the main blade 200. At this time, the blade areas of the main blade 200 and the auxiliary blade 300 jointly disturb the airflow, which is equivalent to increasing the blade area of ​​the main blade 200, thereby achieving high air volume output.

[0058] Therefore, when the rotation speed of the motor changes slightly, the auxiliary blade 300 can be extended or retracted relative to the main blade 200, thereby achieving a significant increase or decrease in the air volume, ensuring that the motor runs in a high energy efficiency state.

[0059] It should be noted that the extending direction of the auxiliary blade 300 relative to the main blade 200 can be along the circumferential direction of the hub 100, that is, the auxiliary blade 300 rotates along the axis of the hub 100 to extend out of the main blade 200; the extending direction of the auxiliary blade 300 relative to the main blade 200 can also be along the axial direction away from the hub 100, and of course it can also be other directions, which are not specifically limited here.

[0060] Further, the main blade 200 is provided with a first accommodating groove 210 , and the first accommodating groove 210 is used to accommodate the auxiliary blade 300 . The auxiliary blade 300 can extend out of the first accommodating groove 210 , or be located in the first accommodating groove 210 .

[0061] In this embodiment, a first receiving groove 210 is provided on the main blade 200 so that the auxiliary blade 300 is hidden and accommodated in the receiving groove of the main blade 200 when the motor is at a low speed. This ensures the aesthetic appearance of the axial flow fan blade 10 without affecting the disturbance of the airflow by the main blade 200, thereby avoiding affecting the air volume.

[0062] It should be noted that the blade area of ​​the auxiliary blade 300 is smaller than the blade area of ​​the main blade 200 .

[0063] Of course, in other embodiments, the blade area of ​​the auxiliary blade 300 may also be equal to the blade area of ​​the main blade 200; not only that, in the maximum stacking state, the auxiliary blade 300 may also overlap behind the main blade 200, as long as the blade area of ​​the auxiliary blade 300 overlaps with the blade area of ​​the main blade 200, and no specific limitation is made here.

[0064] Furthermore, the main blade 200 includes a leading edge 220 and a trailing edge 230 , the leading edge 220 is arc-shaped, the trailing edge 230 is a straight line, and the opening 120 of the first accommodating groove 210 is disposed at the trailing edge 230 .

[0065] In this embodiment, the side of the auxiliary blade 300 is also straight, and the auxiliary blade 300 extends from the straight trailing edge 230, which can effectively increase the blade area and make the structure of the auxiliary blade 300 convenient to process.

[0066] Of course, in other embodiments, the opening 120 of the first receiving groove 210 may also be disposed at the front edge 220 .

[0067] Furthermore, a limiting portion 310 is provided on the edge of the auxiliary blade 300 , and the limiting portion 310 is used to abut against the edge of the main blade 200 .

[0068] In this embodiment, the limiting portion 310 abuts against the trailing edge 230 of the main blade 200 to prevent the auxiliary blade 300 from being completely retracted into the receiving groove of the main blade 200 and to prevent the auxiliary blade 300 from being stuck in the main blade 200 .

[0069] Specifically, the limiting portions 310 are protruded on both sides of the edge of the auxiliary blade 300 and extend along the edge.

[0070] Furthermore, the axial flow fan blade 10 also includes a reset member 400 , which is disposed on the hub 100 , and is used to drive the secondary blade 300 to retract relative to the main blade 200 .

[0071] In this embodiment, by setting the reset member 400, the auxiliary blade 300 is always hidden and accommodated in the first receiving groove 210 of the main blade 200 when the motor is not started or the speed is low, so as to ensure that the axial flow fan 10 maintains low air volume operation; and after the speed of the motor increases, the auxiliary blade 300 temporarily overcomes the force of the reset member 400 and extends out of the first receiving groove 210 to achieve the purpose of increasing the blade work area; when the motor speed is reduced from a higher speed to a lower speed, the reset member 400 drives the auxiliary blade 300 to retract from the outside of the first receiving groove 210 to the inside of the first receiving groove 210 to reduce the blade work area; in this way, the motor only needs to adjust a smaller speed to achieve the operation of the axial flow fan 10 with a smaller air volume or a larger air volume.

[0072] Furthermore, a second receiving groove 110 is provided on the outer wall of the hub 100 , the auxiliary blade 300 is at least partially received in the second receiving groove 110 , and the reset member 400 is disposed in the second receiving groove 110 and connected to the auxiliary blade 300 .

[0073] It should be noted that the second accommodating groove 110 corresponds to and is connected to the first accommodating groove 210 , and the auxiliary blade 300 includes a connected blade body 320 and a sliding portion 330 , the first accommodating groove 210 is used to accommodate the blade body 320 , and the second accommodating groove 110 is used to accommodate the sliding portion 330 ; the limiting portion 310 is arranged on the side of the blade body 320 .

[0074] In this embodiment, the reset member 400 and the sliding portion 330 of the auxiliary blade 300 are both arranged in the second accommodating groove 110, so that the sliding portion 330 of the auxiliary blade 300 can slide along the extension direction of the second accommodating groove 110 to extend out of the first accommodating groove 210, or slide along another extension direction of the second accommodating groove 110 under the action of the reset member 400 to retract into the first accommodating groove 210, thereby improving the stability of the auxiliary blade 300 during the extension or retraction process.

[0075] In detail, the reset element 400 is a spring.

[0076] The reset member 400 is located at one end of the second accommodating groove 110 away from the main blade 200. One end of the reset member 400 abuts against the side wall of the second accommodating groove 110, and the other end abuts against the auxiliary blade 300. When the auxiliary blade 300 extends relative to the main blade 200, the reset member 400 is in a compressed state.

[0077] In this embodiment, when the motor is not running or is in a low speed state, the auxiliary blade 300 is located in the receiving groove, and the reset member 400 is in a free state or a compressed state; after the speed of the motor increases slightly, the sliding part 330 overcomes the spring pressure of the reset member 400 and drives the blade body 320 to extend out of the first receiving groove 210; after the speed of the motor decreases, the sliding part 330 retracts into the second receiving groove 110 under the action of the elastic restoring force of the reset member 400, and drives the blade body 320 to retract into the first receiving groove 210.

[0078] It can be understood that the extended blade area of ​​the auxiliary blade 300 increases as the rotation speed of the motor increases, until the blade body 320 is almost completely extended out of the first receiving groove 210 .

[0079] Furthermore, the sliding portion 330 can perform a circular motion around the axis of the wheel hub 100 in the second receiving groove 110 , and the reset member 400 is connected to the sliding portion 330 .

[0080] In this embodiment, the second receiving groove 110 and the sliding portion 330 are both arc-shaped, and the sliding portion 330 is concentrically arranged with the hub 100, so that the sliding portion 330 can perform a rotational circular motion around the axis of the hub 100, thereby driving the blade body 320 to slide smoothly to extend or retract the first receiving groove 210.

[0081] Furthermore, the axial flow fan blade 10 further includes a cover plate 500 , the bottom wall of the hub 100 is provided with an opening 120 communicating with the second accommodating groove 110 , and the cover plate 500 is provided on one side of the hub 100 provided with the opening 120 .

[0082] It can be understood that the shape of the opening 120 is consistent with the shape of the second receiving groove 110, so that the sliding portion 330 of the auxiliary blade 300 and the reset member 400 can enter the second receiving groove 110 through the opening 120, thereby facilitating the assembly of the axial flow fan blade 10; and the cover plate 500 is used to cover the opening 120, so that the sliding portion 330 of the auxiliary blade 300 can be stably accommodated in the second receiving groove 110.

[0083] Furthermore, the number of the auxiliary blades 300 and the second receiving grooves 110 are both multiple, the multiple second receiving grooves 110 are evenly arranged around the hub 100, and the sliding parts 330 of the multiple auxiliary blades 300 are arranged in the multiple second receiving grooves 110 in a one-to-one correspondence.

[0084] Optionally, in this embodiment, the number of main blades 200, auxiliary blades 300, second accommodating grooves 110 and reset members 400 are all three, the three blade bodies 320 are respectively accommodated in the first accommodating grooves 210 of the three main blades 200, and the three sliding parts 330 and the three reset members 400 are respectively accommodated in the second accommodating grooves 110.

[0085] Of course, in other embodiments, the number of the main blades 200, the auxiliary blades 300, the second accommodating grooves 110 and the reset member 400 may be other arrangements, which are not specifically limited here.

[0086] In summary, the embodiment of the present invention provides an axial flow fan blade 10 and an air conditioner. When the motor speed is low, the auxiliary blade 300 retracts relative to the main blade 200 and achieves low air volume output; when the motor speed increases slightly, the auxiliary blade 300 extends relative to the main blade 200 to increase the blade area, thereby achieving high air volume output. Therefore, when the motor speed changes slightly, the auxiliary blade 300 can be extended or retracted relative to the main blade 200, thereby achieving a significant increase or decrease in air volume, thereby ensuring that the motor operates in a high energy efficiency state.

[0087] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention 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 axial flow fan blade, characterized in that: It comprises a main blade (200) and an auxiliary blade (300); The auxiliary blade (300) is movably arranged on the main blade (200), and the auxiliary blade (300) can move relative to the main blade (200) to be in a maximum unfolded state and a maximum stacked state.

2. The axial flow fan blade according to claim 1, characterized in that: In the maximum unfolded state, the windward areas of the main blade (200) and the auxiliary blade (300) are equal to the sum of the areas of the main blade (200) and the auxiliary blade (300).

3. The axial flow fan blade according to claim 1 or 2, characterized in that: In the maximum stacking state, the windward areas of the main blade (200) and the auxiliary blade (300) are equal to the area of ​​the main blade (200).

4. The axial flow fan blade according to claim 1, characterized in that: The axial flow fan blade further comprises a reset member (400), wherein the reset member (400) is connected to the auxiliary blade (300), and the reset member (400) is used to enable the auxiliary blade (300) to have a movement tendency of restoring from the maximum unfolded state to the maximum stacked state.

5. The axial flow fan blade according to claim 4, characterized in that: The axial flow fan blade further comprises a hub (100), the main blade (200) is fixedly arranged on the hub (100), the auxiliary blade (300) is movably arranged on the hub (100), and the reset member (400) is arranged on the hub (100).

6. The axial flow fan blade according to claim 5, characterized in that: The outer wall of the hub (100) is provided with a second accommodating groove (110), the auxiliary blade (300) is at least partially accommodated in the second accommodating groove (110), and the reset member (400) is arranged in the second accommodating groove (110) and connected to the auxiliary blade (300).

7. The axial flow fan blade according to claim 6, characterized in that: The reset member (400) is a spring, and is located in the second receiving groove (110) at one end away from the main blade (200). One end of the reset member (400) abuts against the side wall of the second receiving groove (110), and the other end abuts against the auxiliary blade (300).

8. The axial flow fan blade according to claim 6, characterized in that: The auxiliary blade (300) comprises a blade body (320) and a sliding portion (330) which are connected to each other. The sliding portion (330) can perform circular motion around the axis of the hub (100) in the second receiving groove (110). The reset member (400) is connected to the sliding portion (330).

9. The axial flow fan blade according to claim 1, characterized in that: In the maximum stacking state, the main blade (200) and the auxiliary blade (300) are arranged to overlap.

10. The axial flow fan blade according to claim 1, characterized in that: The main blade (200) is provided with a first accommodating groove (210), and the first accommodating groove (210) is used to accommodate the auxiliary blade (300). The auxiliary blade (300) can extend out of the first accommodating groove (210) to present the maximum expanded state, or the auxiliary blade (300) can retract into the first accommodating groove (210) to present the maximum stacked state.

11. The axial flow fan blade according to claim 10, characterized in that: The main blade (200) comprises a trailing edge (230), the trailing edge (230) is in a straight line, and the opening (120) of the first accommodating groove (210) is arranged at the trailing edge (230).

12. The axial flow fan blade according to claim 1, characterized in that: The main blade (200) comprises a leading edge (220), and the leading edge (220) is arc-shaped.

13. The axial flow fan blade according to claim 1, characterized in that: The edge of the auxiliary blade (300) is provided with a limiting portion (310), and the limiting portion (310) is used to abut against the edge of the main blade (200).

14. An air conditioner, characterized in that: It includes an indoor unit and an outdoor unit, the indoor unit and the outdoor unit are connected by a pipeline, the outdoor unit includes an axial flow fan blade as described in any one of claims 1-13, the axial flow fan blade is installed at the motor bracket of the outdoor unit and rotates at the air guide ring of the outdoor unit.

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