Air duct structure and air conditioner indoor unit having the same

Abstract

The present invention provides an air duct structure and an air conditioner indoor unit having the same. The air duct structure is used for guiding air flow, and the air duct structure comprises: a first air duct, wherein a first fan blade assembly is provided in the first air duct; a second air duct, wherein the first air duct is connected to the second air duct, wherein a second fan blade assembly is provided in the second air duct, so that the first fan blade assembly and the second fan blade assembly rotate in the same direction around a predetermined axis, so that the air flow is sucked into the first air duct and then blown out from the second air duct, or the air flow is sucked into the second air duct and then blown out from the first air duct; and a flow guide assembly, wherein the flow guide assembly is arranged between the first air duct and the second air duct, so as to guide the air flow in the first air duct into the second air duct or guide the air flow in the second air duct into the first air duct, so as to solve the problem of low energy utilization rate of air flow in air conditioners in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of mechanical design, and in particular to an air duct structure and an air conditioner indoor unit having the same. Background Art

[0002] At present, air conditioners have become indispensable household appliances. Air conditioners have a variety of air outlet modes to meet the needs of users. Among them, the air outlet of air conditioners mainly relies on air ducts to guide the airflow.

[0003] In the existing air-conditioning indoor unit, the air duct is provided with two air outlets to realize the cooling mode or the heating mode. The air flow enters the air duct from the first air outlet and is blown out from the second air outlet, or the air flow is blown into the air duct from the second air outlet and blown out from the first air outlet. However, the above two air outlet modes will cause the two air outlets to blow out air flows of different temperatures at the same time, thereby reducing the energy utilization rate and the human comfort of the user. Summary of the invention

[0004] The main purpose of the present invention is to provide an air duct structure and an air conditioner indoor unit having the same, so as to solve the problem of low energy utilization rate of air flow in the air conditioner in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an air duct structure for guiding airflow, the air duct structure comprising: a first air duct, the first air duct having a first fan blade assembly; a second air duct, the first air duct is connected to the second air duct, the second air duct having a second fan blade assembly, so that the first fan blade assembly and the second fan blade assembly rotate in the same direction around a predetermined axis, so that the airflow is sucked into the first air duct and then blown out from the second air duct, or the airflow is sucked into the second air duct and then blown out from the first air duct; a guide assembly, the guide assembly is arranged between the first air duct and the second air duct, so as to guide the airflow in the first air duct into the second air duct or guide the airflow in the second air duct into the first air duct.

[0006] Furthermore, the guide assembly includes: a guide cover, the first air duct and the second air duct are connected through the guide cover, and the guide cover has a passing space for airflow to pass through; a guide blade, the guide blade is installed in the passing space, and the guide blades are multiple, and the multiple guide blades are arranged at intervals around the axis of the guide cover to form a guide gap between two adjacent guide blades for guiding the airflow.

[0007] Furthermore, the first air duct has a first air outlet so that air can flow into or out of the first air duct through the first air outlet; the body of the first fan blade assembly extends along the direction of a predetermined axis and extends out of the end surface of the first air outlet.

[0008] Furthermore, an opening is provided on the side wall of the first air duct, and the opening extends to the first air outlet, so as to increase the air induced by the first fan blade assembly through the opening.

[0009] Furthermore, the air duct structure also includes: a first tapered portion, the first tapered portion having a first side wall at least partially opposite to the body of the second fan blade assembly; a first power device, the first tapered portion is connected to the first power device to drive the first side wall to extend or retract in a direction close to or away from the second fan blade assembly through the first power device to increase or decrease the radial air suction volume of the second fan blade assembly.

[0010] Further, the body of the second fan blade assembly extends along the direction of a predetermined axis, and one end of the second fan blade assembly is located on a side of the first constricted portion close to the first fan blade assembly.

[0011] Furthermore, the first fan blade assembly has a first hub, and the second fan blade assembly has a second hub. Both the first hub and the second hub are truncated cone-shaped, and the first large-diameter end of the first hub and the second small-diameter end of the second hub are arranged opposite to each other.

[0012] Furthermore, the air duct structure also includes: a driving device, which is drivingly connected to the first fan blade assembly and the second fan blade assembly respectively to drive the first fan blade assembly and the second fan blade assembly to rotate in the same direction around a predetermined axis.

[0013] Furthermore, the air duct structure also includes: a mounting plate, the mounting plate is mounted between the first air duct and the second air duct, and at least a portion of the air guide assembly is mounted on the mounting plate.

[0014] Furthermore, the second air duct also includes: an air guide portion, which is arranged on a side of the second wind blade assembly away from the first wind blade assembly, and the air guide portion has a third guide blade. There are multiple third guide blades, and the multiple third guide blades are arranged at intervals around a predetermined axis to form a guide gap between two adjacent third guide blades, and the guide gap extends in the direction of the predetermined axis to guide the airflow.

[0015] Furthermore, the air duct structure also includes: a second tapered portion, which is arranged on a side of the air guide portion away from the second fan blade assembly so that the airflow flows out of or flows into the second air duct through the second tapered portion, and the second tapered portion has a second side wall; a second power device, the second tapered portion is connected to the second power device so as to drive the second side wall to extend or retract in a direction close to or away from a predetermined axis through the second power device so as to adjust the flow rate of the airflow in the second tapered portion.

[0016] According to another aspect of the present invention, an air conditioner indoor unit is provided, comprising an evaporator and an air duct structure, wherein the evaporator and the air duct structure are both installed in the body of the air conditioner indoor unit, wherein at least a portion of the evaporator is opposite to the air outlet of the air duct structure, and the air duct structure is the above-mentioned air duct structure.

[0017] Furthermore, the evaporator comprises a first plate body and a second plate body, the first plate body and the second plate body are arranged relatively spaced apart, and the distance between the first plate body and the second plate body gradually decreases in the direction away from the air outlet of the air duct structure.

[0018] Further, the air duct structure is the above-mentioned air duct structure; the second air duct has a second air outlet, so that the air flow flows into or flows out of the second air duct through the second air outlet; a first vent and a second vent are provided on the body, the first vent is connected to the first air outlet, and the second vent is connected to the second air outlet, so that the air flow flows into the air duct structure through the first vent and then is blown out by the second vent, or the air flow flows into the air duct structure through the second vent and then is blown out by the first vent.

[0019] Furthermore, the air-conditioning indoor unit has a first ventilation mode and a second ventilation mode: when the air-conditioning indoor unit is in the first ventilation mode, the first fan blade assembly and the second fan blade assembly rotate along the first direction, so that the air flow is sucked into the first air duct through the first vent, and is discharged from the second air outlet after passing through the second air duct, and then is discharged into the room through the second vent after heat exchange with the evaporator; when the air-conditioning indoor unit is in the second ventilation mode, the first fan blade assembly and the second fan blade assembly rotate along the second direction, the air flow is sucked into the body through the second vent to exchange heat with the evaporator, and then is guided into the second air duct by the second air outlet, and then passes through the first air duct to the first air outlet to be discharged into the room through the first vent.

[0020] Furthermore, the air duct structure also includes: a first tapered portion, the first tapered portion having a first side wall that is at least partially opposite to the main body of the second fan blade assembly of the air duct structure; a first power device, the first tapered portion is connected to the first power device, so as to drive the first side wall to extend or retract toward or away from the second fan blade assembly through the first power device, so as to increase or decrease the radial air suction volume of the second fan blade assembly; when the air conditioner indoor unit is in the first ventilation mode, the first power device drives the first side wall to move toward the direction close to the second fan blade assembly, so as to increase the radial air suction volume of the second fan blade assembly.

[0021] By applying the technical solution of the present invention, the duct structure is used to guide the airflow, wherein the duct structure includes a first duct, a second duct and a guide assembly, the first duct is provided with a first blade assembly, the first duct is connected to the second duct, and the second duct is provided with a second blade assembly, so that the first blade assembly and the second blade assembly rotate in the same direction around a predetermined axis, so that the airflow is sucked into the first duct and then blown out from the second duct, or the airflow is sucked into the second duct and then blown out from the first duct, and the guide assembly is arranged between the first duct and the second duct, so as to guide the airflow in the first duct into the second duct or guide the airflow in the second duct into the first duct, so as to realize the switching of the airflow flow direction, have a simple structure and be easy to realize, can ensure the one-way air inlet and outlet of the duct structure, and solve the problem of low energy utilization rate of air flow by air conditioners in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A first cross-sectional view of the air duct structure according to the present invention is shown;

[0024] Figure 2 A second cross-sectional view of the air duct structure according to the present invention is shown;

[0025] Figure 3 A schematic structural diagram of a first viewing angle of an air duct structure according to the present invention is shown;

[0026] Figure 4 A structural schematic diagram of a second viewing angle of the air duct structure according to the present invention is shown;

[0027] Figure 5 A schematic structural diagram showing a third viewing angle of the air duct structure according to the present invention is shown;

[0028] Figure 6 A structural schematic diagram showing a fourth viewing angle of the air duct structure according to the present invention;

[0029] Figure 7 A schematic structural diagram of an embodiment of a mounting plate according to the present invention from a first viewing angle is shown;

[0030] Figure 8 shows a top view of a mounting plate according to the present invention;

[0031] Fig. 9 A schematic structural diagram of an embodiment of a mounting plate according to a second viewing angle of the present invention is shown;

[0032] Fig.10shows a bottom view of a mounting plate according to the present invention;

[0033] Fig.11 It shows a structural schematic diagram of a first ventilation mode of an indoor unit of an air conditioner according to the present invention;

[0034] Fig.12 It shows a structural schematic diagram of a second ventilation mode of an indoor unit of an air conditioner according to the present invention;

[0035] Fig.13 A schematic structural diagram of an embodiment of a first fan blade assembly or a second fan blade assembly according to the present invention is shown;

[0036] Fig.14 A schematic structural diagram of a second fan blade assembly or an embodiment of a second fan blade assembly according to the present invention is shown.

[0037] The above drawings include the following reference numerals:

[0038] 1. Evaporator; 2. Machine body; 3. First vent; 4. Second vent;

[0039] 10. first air duct; 11. first fan blade assembly; 12. first air outlet; 13. opening; 20. second air duct; 21. second fan blade assembly; 22. air guide; 220. third guide blade; 2201. guide gap; 23. second air outlet; 30. mounting plate; 31. driving device;

[0040] 32. Guide assembly; 320. Guide blade; 3201. First guide blade; 3202. Second guide blade; 321. Guide cover; 322. Guide interval; 3220. First guide interval; 3221. Second guide interval; 323. Second passing space; 324. First passing space; 302. Mounting hole; 40. First necking portion; 50. Second necking portion. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] The present invention provides a duct structure, please refer to Figures 1 to 14, used for guiding the airflow, the air duct structure includes: a first air duct 10, the first air duct 10 has a first fan blade assembly 11; a second air duct 20, the first air duct 10 is connected to the second air duct 20, and the second air duct 20 has a second fan blade assembly 21, so that the first fan blade assembly 11 and the second fan blade assembly 21 rotate in the same direction around a predetermined axis, so that the airflow is sucked into the first air duct 10 and then blown out from the second air duct 20, or the airflow is sucked into the second air duct 20 and then blown out from the first air duct 10; a guide assembly 32, the guide assembly 32 is arranged between the first air duct 10 and the second air duct 20, so as to guide the airflow in the first air duct 10 into the second air duct 20 or guide the airflow in the second air duct 20 into the first air duct 10.

[0043] The air duct structure provided according to the present invention is used to guide the airflow, wherein the air duct structure includes a first air duct 10, a second air duct 20 and a guide component 32, the first air duct 10 has a first fan blade component 11, the first air duct 10 is connected to the second air duct 20, and the second air duct 20 has a second fan blade component 21, so that the first fan blade component 11 and the second fan blade component 21 rotate in the same direction around a predetermined axis, so that the airflow is sucked into the first air duct 10 and then blown out from the second air duct 20, or the airflow is sucked into the second air duct 20 and then blown out from the first air duct 10, the guide component 32 is arranged between the first air duct 10 and the second air duct 20, so as to guide the airflow in the first air duct 10 into the second air duct 20 or guide the airflow in the second air duct 20 into the first air duct 10, so as to realize the switching of the airflow flow direction, the structure is simple and easy to realize, and can ensure the one-way air inlet and outlet of the air duct structure, thereby solving the problem of low energy utilization rate of airflow by air conditioners in the prior art.

[0044] Specifically, the guide assembly 32 includes: a guide cover 321, the first air duct 10 and the second air duct 20 are connected through the guide cover 321, and the guide cover 321 has a passage space for airflow to pass through; a guide blade 320, the guide blade 320 is installed in the passage space, and there are multiple guide blades 320, and the multiple guide blades 320 are arranged at intervals around the axis of the guide cover 321 to form a guide gap 322 for guiding the airflow between two adjacent guide blades 320, wherein the axis of the guide cover 321 coincides with the predetermined axis; the guide gap 322 extends in the direction of the predetermined axis, and by setting the guide assembly 32, the airflow flowing along the circumferential direction in the first air duct 10 or the second air duct 20 is guided through the guide gap 322, so that the airflow flows in the direction of the predetermined axis, thereby reducing the vortex loss between the airflows, improving the efficiency of the first fan blade assembly 11 and the second fan blade assembly 21, and increasing the air output of the air duct structure.

[0045] In a specific implementation, the first air duct 10 has a first air port 12 so that air can flow into or out of the first air duct 10 through the first air port 12 ; the body of the first fan blade assembly 11 extends along a predetermined axis and extends out of the end surface of the first air port 12 .

[0046] An opening 13 is provided on the side wall of the first air duct 10, and the opening 13 extends to the first air outlet 12 to increase the air intake or air outlet of the first fan blade assembly 11 through the opening 13. When the first air outlet 12 discharges air, the airflow can be discharged through the opening 13, so that the resistance inside the first air duct 10 is reduced, thereby improving the work efficiency of the first air duct 10 and reducing the eddy loss of the airflow.

[0047] In the embodiment provided by the present invention, the air duct structure also includes: a first tapered portion 40, the first tapered portion 40 having a first side wall at least partially opposite to the main body of the second fan blade assembly 21; a first power device, the first tapered portion 40 is connected to the first power device to drive the first side wall to extend or retract in a direction close to or away from the second fan blade assembly 21 through the first power device, so as to increase or decrease the radial air suction volume of the second fan blade assembly 21 and improve the work efficiency of the second air duct 20.

[0048] Specifically, the body of the second fan blade assembly 21 extends along a direction of a predetermined axis, and one end of the second fan blade assembly 21 is located at a side of the first constricted portion 40 close to the first fan blade assembly 11 .

[0049] Furthermore, if Fig.13 and Fig.14 As shown, the first fan blade assembly 11 has a first hub, and the second fan blade assembly 21 has a second hub. The first hub and the second hub are both in the shape of a truncated cone. The first hub has a first large diameter end and a first small diameter end, and the second hub has a second large diameter end and a second small diameter end. By changing the rotation direction of the first fan blade assembly 11, air outlet or air inlet at the first large diameter end is achieved, and by changing the rotation direction of the second fan blade assembly 21, air outlet or air inlet at the second large diameter end is achieved. In the embodiment provided by the present invention, the first large diameter end is opposite to the second small diameter end to achieve the same-direction rotation of the first fan blade assembly 11 and the second fan blade assembly 21 to guide the airflow.

[0050] In order to facilitate driving the first fan blade assembly 11 and the second fan blade assembly 21, the air duct structure also includes: a driving device 31, which is respectively driven and connected to the first fan blade assembly 11 and the second fan blade assembly 21 to drive the first fan blade assembly 11 and the second fan blade assembly 21 to rotate in the same direction around a predetermined axis; specifically, the first driving shaft of the driving device 31 is driven and connected to the first large diameter end of the first hub, and the second driving shaft of the driving device 31 is driven and connected to the second small diameter end of the second hub.

[0051] The air duct structure further includes: a mounting plate 30 , which is mounted between the first air duct 10 and the second air duct 20 , and at least a portion of the air guide assembly 32 is mounted on the mounting plate 30 .

[0052] During the specific implementation process, the second air duct 20 also includes: an air guide portion 22, which is arranged on the side of the second fan blade assembly 21 away from the first fan blade assembly 11, and the air guide portion 22 has a third guide blade 220, and the third guide blade 220 is multiple, and the multiple third guide blades 220 are arranged at intervals around a predetermined axis to form a guide gap 2201 between two adjacent third guide blades 220, and the guide gap 2201 extends along the direction of the predetermined axis to guide the airflow, reduce the eddy loss generated by the second fan blade assembly 21, and increase the air intake or air outlet of the second air duct 20.

[0053] Specifically, the air duct structure also includes: a second tapered portion 50, which is arranged on the side of the air guide portion 22 away from the second fan blade assembly 21, so that the airflow flows out of or flows into the second air duct 20 through the second tapered portion 50, and the second tapered portion 50 has a second side wall; a second power device, the second tapered portion 50 is connected to the second power device to drive the second side wall to expand and contract in a direction close to or away from a predetermined axis through the second power device, so as to adjust the flow rate of the airflow in the second tapered portion 50.

[0054] In another embodiment provided by the present invention, the guide blade 320 includes a first guide blade 3201 and a second guide blade 3202, and the guide cover has a first through space 324 and a second through space 323, the first through space 324 is connected to the second through space 323, the first guide blade 3201 is arranged in the first through space 324, and the second guide blade 3202 is arranged in the second through space 323, there are multiple first guide blades 3201, and the multiple first guide blades 3201 are arranged at intervals around the axis of the first through space 324 to form a first guide interval 3220 between two adjacent first guide blades 3201; there are multiple second guide blades 3202, and the multiple second guide blades 3202 are arranged at intervals around the axis of the second through space 323 to form a first guide interval 3220 between two adjacent first guide blades 3201. A second guide interval 3221 is formed between the two second guide blades 3202, wherein the first guide interval 3220 and the second guide interval 3221 are both multiple, and the multiple first guide intervals 3220 and the multiple second guide intervals 3221 are arranged in a one-to-one correspondence to guide the airflow, and the axis of the first passing space 324 and the axis of the second passing space 323 coincide with the axis of the guide cover; wherein a mounting hole 302 is also provided in the second passing space 323, and the multiple second guide blades 3202 are arranged between the outer wall of the mounting hole 302 and the inner wall of the second passing space 323, and the driving device 31 is installed in the mounting hole 302, and the driving device 31 has a first output shaft and a second output shaft, the first output shaft is drivingly connected to the first fan blade assembly 11, and the second output shaft is drivingly connected to the second fan blade assembly 21.

[0055] The present invention also provides an air-conditioning indoor unit, including an evaporator 1 and an air duct structure, wherein the evaporator 1 and the air duct structure are both installed in a body 2 of the air-conditioning indoor unit, and at least a portion of the evaporator 1 is opposite to the air outlet of the air duct structure, wherein the air duct structure is the air duct structure of the above-mentioned embodiment.

[0056] Specifically, in order to improve the heat exchange efficiency between the airflow and the evaporator 1, the evaporator 1 has a first plate and a second plate, the first plate and the second plate are relatively spaced apart, and the distance between the first plate and the second plate gradually decreases in the direction away from the air outlet of the air duct structure.

[0057] In the embodiment provided by the present invention, the air duct structure is the air duct structure of the above-mentioned embodiment; the second air duct 20 has a second air outlet 23, so that the air flow flows into or flows out of the second air duct 20 through the second air outlet 23; the first vent 3 and the second vent 4 are provided on the body 2, the first vent 3 is connected with the first air outlet 12, and the second vent 4 is connected with the second air outlet 23, so that the air flow flows into the air duct structure through the first vent 3 and then is blown out by the second vent 4, or the air flow flows into the air duct structure through the second vent 4 and then is blown out by the first vent 3.

[0058] The air conditioner indoor unit has a first ventilation mode and a second ventilation mode: when the air conditioner indoor unit is in the first ventilation mode, the first fan blade assembly 11 and the second fan blade assembly 21 rotate along the first direction, so that the air flow is sucked into the first air duct 10 through the first vent 3, and is discharged from the second air duct 20 by the second air vent 23, and then is discharged into the room through the second vent 4 after heat exchange with the evaporator 1; when the air conditioner indoor unit is in the second ventilation mode, the first fan blade assembly 11 and the second fan blade assembly 21 rotate along the second direction, the air flow is sucked into the body 2 through the second vent 4, and is heat exchanged with the evaporator 1, and then is guided into the second air duct 20 by the second air vent 23, and then the air flow passes through the first air duct 10 to the first air vent 12, so as to be discharged into the room through the first vent 3.

[0059] Specifically, when the air-conditioning indoor unit is in the first ventilation mode, the first power device drives the first side wall to move toward the direction close to the second fan blade assembly 21, so as to increase the radial air suction volume of the second fan blade assembly 21, and further improve the air output of the air-conditioning indoor unit and the energy utilization rate of the air flow; at the same time, the second power device drives the second side wall to move toward the direction close to the predetermined axis, wherein the direction of the predetermined axis is consistent with the direction of the middle of the air duct, so that the airflow in the air duct can flow out more concentratedly, thereby improving the air output efficiency.

[0060] During specific use, the air conditioner includes a cooling mode and a heating mode. In this embodiment, taking a vertical air conditioner as an example, the first vent 3 is located at the lower part of the air conditioner body, and the second vent 4 is located at the upper part of the air conditioner body. When the air conditioner is in the heating mode, air is sucked in by the second air duct 20, and the hot air flows through the first air duct 10 and is discharged into the room through the first vent 3; when the air conditioner is in the cooling mode, air is sucked in by the first air duct 10, and the cold air flows through the second air duct 20 and is discharged into the room through the second vent 4, which improves the energy utilization rate of the air flow by the air conditioner and improves the comfort of the user.

[0061] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0062] The air duct structure provided according to the present invention is used to guide the airflow, wherein the air duct structure includes a first air duct 10, a second air duct 20 and a guide component 32, the first air duct 10 has a first fan blade component 11, the first air duct 10 is connected to the second air duct 20, and the second air duct 20 has a second fan blade component 21, so that the first fan blade component 11 and the second fan blade component 21 rotate in the same direction around a predetermined axis, so that the airflow is sucked into the first air duct 10 and then blown out from the second air duct 20, or the airflow is sucked into the second air duct 20 and then blown out from the first air duct 10, the guide component 32 is arranged between the first air duct 10 and the second air duct 20, so as to guide the airflow in the first air duct 10 into the second air duct 20 or guide the airflow in the second air duct 20 into the first air duct 10, so as to realize the switching of the airflow flow direction, the structure is simple and easy to realize, and can ensure the one-way air inlet and outlet of the air duct structure, thereby solving the problem of low energy utilization rate of airflow by air conditioners in the prior art.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air duct structure for guiding airflow, characterized in that: The air duct structure comprises: A first air duct (10), wherein a first air blade assembly (11) is provided in the first air duct (10); a second air duct (20), the first air duct (10) being in communication with the second air duct (20), the second air duct (20) having a second fan blade assembly (21) therein, so that the first fan blade assembly (11) and the second fan blade assembly (21) rotate in the same direction around a predetermined axis, so that the airflow is sucked into the first air duct (10) and then blown out of the second air duct (20), or the airflow is sucked into the second air duct (20) and then blown out of the first air duct (10); a flow guide component (32), the flow guide component (32) being arranged between the first air duct (10) and the second air duct (20) so as to guide the airflow in the first air duct (10) into the second air duct (20) or to guide the airflow in the second air duct (20) into the first air duct (10); The air duct structure further comprises: a first constricted portion (40) and a first power device; the first constricted portion (40) comprises a first side wall at least partially opposite to the body of the second fan blade assembly (21); the first constricted portion (40) is connected to the first power device, so that the first side wall is driven by the first power device to extend or retract in a direction approaching or away from the second fan blade assembly (21), so as to increase or decrease the radial air suction volume of the second fan blade assembly (21); The body of the second fan blade assembly (21) extends along the direction of the predetermined axis, and one end of the second fan blade assembly (21) is located on a side of the first constricted portion (40) close to the first fan blade assembly (11).

2. The air duct structure according to claim 1, characterized in that: The flow guide component (32) comprises: A flow guide cover (321), the first air duct (10) and the second air duct (20) are connected via the flow guide cover (321), and the flow guide cover (321) has a passage space for airflow to pass through; A guide blade (320), the guide blade (320) being installed in the passage space, the guide blade (320) being multiple, and the multiple guide blades (320) being arranged at intervals around the axis of the guide cover (321) so as to form a guide interval (322) for guiding the airflow between two adjacent guide blades (320).

3. The air duct structure according to claim 1, characterized in that: The first air duct (10) has a first air outlet (12) so that air can flow into or out of the first air duct (10) through the first air outlet (12); the body of the first air blade assembly (11) extends along the direction of the predetermined axis and extends beyond the end surface of the first air outlet (12).

4. The air duct structure according to claim 3, characterized in that: An opening (13) is provided on a side wall of the first air duct (10), and the opening (13) extends to the first air outlet (12), so as to increase the air flow rate of the first fan blade assembly (11) through the opening (13).

5. The air duct structure according to any one of claims 1 to 4, characterized in that: The first fan blade assembly (11) has a first hub, and the second fan blade assembly (21) has a second hub. The first hub and the second hub are both in the shape of a truncated cone, and a first large-diameter end of the first hub and a second small-diameter end of the second hub are arranged opposite to each other.

6. The air duct structure according to any one of claims 1 to 4, characterized in that: The air duct structure also includes: A driving device (31), the driving device (31) being drivably connected to the first fan blade assembly (11) and the second fan blade assembly (21) respectively, so as to drive the first fan blade assembly (11) and the second fan blade assembly (21) to rotate in the same direction around the predetermined axis.

7. The air duct structure according to any one of claims 1 to 4, characterized in that: The air duct structure also includes: A mounting plate (30), the mounting plate (30) being mounted between the first air duct (10) and the second air duct (20), and at least a portion of the air guide assembly (32) being mounted on the mounting plate (30).

8. The air duct structure according to any one of claims 1 to 4, characterized in that: The second air duct (20) further comprises: An air guide portion (22), the air guide portion (22) being arranged on a side of the second air blade assembly (21) away from the first air blade assembly (11), the air guide portion (22) having a third guide blade (220), the third guide blade (220) being multiple, the multiple third guide blades (220) being arranged at intervals around the predetermined axis so as to form a guide gap (2201) between two adjacent third guide blades (220), the guide gap (2201) extending in the direction of the predetermined axis so as to guide the airflow.

9. The air duct structure according to claim 8, characterized in that: The air duct structure also includes: a second constricted portion (50), the second constricted portion (50) being arranged on a side of the air guide portion (22) away from the second fan blade assembly (21), so that air flows out of or into the second air duct (20) through the second constricted portion (50), the second constricted portion (50) having a second side wall; A second power device, the second constricted portion (50) being connected to the second power device, so as to drive the second side wall to extend or retract in a direction approaching or away from the predetermined axis through the second power device, so as to adjust the flow rate of the airflow in the second constricted portion (50).

10. An air conditioner indoor unit, comprising an evaporator (1) and an air duct structure, wherein the evaporator (1) and the air duct structure are both installed in a body (2) of the air conditioner indoor unit, and at least a portion of the evaporator (1) is opposite to an air outlet of the air duct structure, characterized in that: The air duct structure is the air duct structure according to any one of claims 1 to 9.

11. The air conditioner indoor unit according to claim 10, characterized in that: The evaporator (1) comprises a first plate body and a second plate body, the first plate body and the second plate body are arranged relatively spaced apart, and the distance between the first plate body and the second plate body gradually decreases in a direction away from the air outlet of the air duct structure.

12. The air conditioner indoor unit according to claim 11, characterized in that: The air duct structure is the air duct structure according to claim 3; the second air duct (20) has a second air outlet (23), so that air flows into or out of the second air duct (20) through the second air outlet (23); The machine body (2) is provided with a first vent (3) and a second vent (4), the first vent (3) being in communication with the first air port (12), and the second vent (4) being in communication with the second air port (23), so that airflow flows into the air duct structure through the first vent (3) and is blown out through the second vent (4), or airflow flows into the air duct structure through the second vent (4) and is blown out through the first vent (3).

13. The air conditioner indoor unit according to claim 12, characterized in that: The air conditioner indoor unit has a first ventilation mode and a second ventilation mode: When the air conditioner indoor unit is in the first ventilation mode, the first fan blade assembly (11) and the second fan blade assembly (21) rotate in a first direction, so that airflow is sucked into the first air duct (10) through the first vent (3), and is discharged from the second air duct (20) through the second air duct (20), and then is discharged into the room through the second vent (4) after heat exchange with the evaporator (1); When the air conditioner indoor unit is in the second ventilation mode, the first fan blade assembly (11) and the second fan blade assembly (21) rotate in the second direction, and air is sucked into the machine body (2) through the second ventilation port (4) to exchange heat with the evaporator (1), and then guided into the second air duct (20) through the second air port (23), and then the air flows through the first air duct (10) to the first air port (12), and then discharged into the room through the first ventilation port (3).

14. The air conditioner indoor unit according to claim 13, characterized in that: The air duct structure also includes: A first constricted portion (40), the first constricted portion (40) having a first side wall at least partially opposite to a body of the second fan blade assembly (21) of the air duct structure; a first power device, the first constricted portion (40) being connected to the first power device so as to drive the first side wall to extend or retract in a direction approaching or away from the second fan blade assembly (21) through the first power device, so as to increase or decrease the radial air suction volume of the second fan blade assembly (21); When the air conditioner indoor unit is in the first ventilation mode, the first power device drives the first side wall to move in a direction close to the second fan blade assembly (21), so as to increase the radial air intake volume of the second fan blade assembly (21).

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