Air supply mechanism and air conditioner indoor unit having the same

Abstract

The present invention provides an air supply mechanism and an air conditioner indoor unit having the same. The air supply mechanism includes: a fan assembly, including a fan housing and a fan blade arranged in the fan housing, the fan housing including a housing body and two rotating parts, each rotating part is respectively arranged on both sides of the housing body, and the fan blade shaft of the fan blade is inserted into the two rotating parts; a bearing assembly, located on the first side of the fan assembly, the bearing assembly includes a first bearing and a second bearing, a rotating part extends into the first bearing, and the fan blade shaft extends into the second bearing; a bearing structure, located on the second side of the fan assembly, the bearing structure has a through hole, and the other rotating part extends into the through hole; a first positioning assembly, arranged between the through hole and the rotating part and including a first positioning part and a second positioning part, the first positioning part and the second positioning part limit stops, so that the fan housing rotates within a preset area. The present invention solves the problem in the prior art that the air outlet direction of the fan assembly cannot meet the user's use requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air supply mechanism and an air conditioner indoor unit having the same. Background Art

[0002] At present, during the operation of the wall-mounted air conditioner, the fan blades of the fan assembly rotate to make air flow into or out of the air conditioner, thereby realizing the circulation of indoor air. Among them, the fan blades of the fan assembly are cross-flow blades, one end of the fan blade shaft is fixedly connected to the drive motor shaft, and the other end is connected to the bearing.

[0003] However, in the prior art, the fan housing of the fan assembly is fixed, and only the fan blades are rotatable, which cannot meet the user's demand for different air outlet directions. Summary of the invention

[0004] The main purpose of the present invention is to provide an air supply mechanism and an air conditioner indoor unit having the same, so as to solve the problem in the prior art that the air outlet direction of the fan assembly cannot meet the user's use requirements.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an air supply mechanism, which is arranged at the air outlet of an indoor unit of an air conditioner, and the air supply mechanism comprises: a fan assembly, comprising a fan housing and a fan blade arranged in the fan housing, the fan housing comprising a housing body and two rotating parts, each rotating part is respectively arranged on both sides of the housing body, and the fan blade shaft of the fan blade is penetrated in the two rotating parts; a bearing assembly, which is located on a first side of the fan assembly, the bearing assembly comprises a first bearing and a second bearing, a rotating part extends into the first bearing, and the fan blade shaft extends into the second bearing; a bearing structure, which is located on a second side of the fan assembly, the bearing structure has a through hole, and the other rotating part extends into the through hole; a first positioning assembly, which is arranged between the through hole and the rotating part, the first positioning assembly comprises a first positioning part and a second positioning part, and the first positioning part and the second positioning part limit stops so that the fan housing rotates within a preset area.

[0006] Furthermore, the first positioning portion is arranged on the outer circumferential surface of the rotating portion, and the second positioning portion is arranged on the inner circumferential surface of the through hole. One of the first positioning portion and the second positioning portion is a first protrusion, and the other of the first positioning portion and the second positioning portion is a first recess. The first protrusion extends into the first recess and is limited by the first recess.

[0007] Further, there is one first protrusion; or, there are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the extension direction of the through hole.

[0008] Further, the first protrusion is an annular protrusion, the first recess is an annular or arc-shaped groove, and the inner diameter D1 of the annular or arc-shaped groove and the outer diameter D2 of the annular protrusion satisfy: 2D2≥D1>D2.

[0009] Furthermore, the first protrusion includes a plurality of arc segments spaced around the central axis of the through hole, and the first recess is an annular or arc groove, and the inner diameter D1 of the annular or arc groove and the outer diameter D2 of the arc segment satisfy: 2D2≥D1>D2.

[0010] Furthermore, the air supply mechanism also includes: a first driving device; a first gear, which is drivingly connected to the first driving device; a transmission structure, which is arranged on the fan housing of the fan assembly and meshes with the first gear, and the transmission structure is a second gear or a rack; wherein the width L1 of the first recess, the width L2 of the first protrusion and the width L3 of the second gear or the rack satisfy the axial movement dimension μ of the fan housing: 0<μ=L1-L2<L3.

[0011] Furthermore, the width L1 of the first recess, the width L2 of the first protrusion, and the width L3 of the second gear or rack satisfy the following relationship with the axial movement dimension μ of the fan housing: 0<μ<1 / 3L3.

[0012] Further, the bearing structure includes: two supporting members arranged opposite to each other, each supporting member having a second recess, and a through hole is formed between the two second recesses; a second positioning assembly, arranged between the two supporting members, the second positioning assembly includes a third positioning portion and a fourth positioning portion, one of the third positioning portion and the fourth positioning portion is a second protrusion, and the other of the third positioning portion and the fourth positioning portion is a second recess, and the second protrusion extends into the second recess and cooperates with the second recess to limit the position.

[0013] Furthermore, each support member includes a first plate body, an arc-shaped plate body and a second plate body, the two ends of the arc-shaped plate body are respectively connected to the first plate body and the second plate body, and the inner circumferential surface of the arc-shaped plate body is a second recessed portion; the bearing structure also includes a reinforcing rib, which is arranged at the connection between the first plate body and the arc-shaped plate body; and / or, the reinforcing rib is arranged at the connection between the second plate body and the arc-shaped plate body.

[0014] Furthermore, the inner diameter D4 of the first bearing and the outer diameter D3 of the fan blade shaft satisfy: 7D3≥D4>D3.

[0015] Furthermore, the first recessed portion is an arc-shaped groove, and the central angle θ corresponding to the arc-shaped groove and the rotation angle α of the fan housing satisfy: 360°≥θ≥α.

[0016] According to another aspect of the present invention, an air conditioner indoor unit is provided, comprising an indoor unit body and an air supply mechanism, wherein the indoor unit body has an air outlet; wherein the air supply mechanism is the above-mentioned air supply mechanism.

[0017] By applying the technical solution of the present invention, the first bearing is used to support a rotating part of the fan housing, the bearing structure is used to support another rotating part of the fan housing, and the fan housing is rotatably arranged. The second bearing is used to support the fan blade shaft, and both the fan housing and the fan blade shaft are rotatably arranged. In this way, during the operation of the air conditioner, the user can control the rotation of the fan housing according to the use requirements to meet different air outlet requirements, thereby solving the problem in the prior art that the air outlet direction of the fan assembly cannot meet the use requirements of the user. At the same time, the first positioning assembly arranged between the through hole of the bearing structure and the rotating part can limit the axial movement of the fan housing, so that the fan housing rotates within a preset area, and prevents the fan housing from axially moving or moving outside the preset area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 A cross-sectional view showing an embodiment of an air conditioner indoor unit according to the present invention; and

[0020] Figure 2 A three-dimensional structural schematic diagram of the air supply mechanism according to the first embodiment of the present invention is shown;

[0021] Figure 3 Shows Figure 2 Exploded diagram of the air supply mechanism in;

[0022] Figure 4 Shows Figure 2 A cross-sectional view of the air supply mechanism in FIG.

[0023] Figure 5 Shows Figure 4 An enlarged schematic diagram of the air supply mechanism at point A;

[0024] Figure 6 Shows Figure 2 A cross-sectional view of the bearing assembly of the air supply mechanism and the fan blade shaft after being assembled;

[0025] Figure 7 Shows Figure 6 An exploded view of the bearing assembly in FIG.

[0026] Figure 8 Shows Figure 2 A three-dimensional structural schematic diagram of the bearing structure of the air supply mechanism;

[0027] Fig. 9 Shows Figure 8 Exploded diagram of the bearing structure in;

[0028] Fig.10 Shows Figure 8 A cross-sectional view of the bearing structure in FIG.

[0029] Fig.11 A cross-sectional view showing a second embodiment of the air supply mechanism according to the present invention; and

[0030] Fig.12 Shows Fig.11 Schematic diagram of the three-dimensional structure of the air supply mechanism.

[0031] The above drawings include the following reference numerals:

[0032] 10. Fan assembly; 11. Fan casing; 111. Casing body; 112. Rotating part; 113. First positioning part; 12. Fan blade; 121. Fan blade shaft; 20. Bearing assembly; 21. First bearing; 22. Second bearing; 23. Bearing seat; 24. Bearing sleeve; 30. Bearing structure; 31. Through hole; 311. Second positioning part; 32. Support member; 321. First plate body; 322. Arc plate body; 323. Second plate body; 33. Third positioning part; 34. Fourth positioning part; 35. Reinforcing rib; 40. Indoor unit body; 50. Second driving device; 60. First driving device; 70. First gear; 80. Transmission structure. DETAILED DESCRIPTION

[0033] 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.

[0034] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0035] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0036] In order to solve the problem in the prior art that the air outlet direction of the fan assembly cannot meet the user's usage requirements, the present application provides an air supply mechanism and an air conditioner indoor unit having the same.

[0037] Embodiment 1

[0038] like Figures 1 to 10As shown, the air supply mechanism is arranged at the air outlet of the indoor unit of the air conditioner, and the air supply mechanism includes a fan assembly 10, a bearing assembly 20, a bearing structure 30 and a first positioning assembly. Among them, the fan assembly 10 includes a fan housing 11 and a fan blade 12 arranged in the fan housing 11, and the fan housing 11 includes a housing body 111 and two rotating parts 112, each rotating part 112 is respectively arranged on both sides of the housing body 111, and the fan blade shaft 121 of the fan blade 12 is penetrated in the two rotating parts 112. The bearing assembly 20 is located on the first side of the fan assembly 10, and the bearing assembly 20 includes a first bearing 21 and a second bearing 22, one rotating part 112 extends into the first bearing 21, and the fan blade shaft 121 extends into the second bearing 22. The bearing structure 30 is located on the second side of the fan assembly 10, and the bearing structure 30 has a through hole 31, and the other rotating part 112 extends into the through hole 31. The first positioning assembly is disposed between the through hole 31 and the rotating portion 112 , and includes a first positioning portion 113 and a second positioning portion 311 . The first positioning portion 113 and the second positioning portion 311 are limit stops to enable the fan housing 11 to rotate within a preset area.

[0039] Using the technical solution of this embodiment, the first bearing 21 is used to support a rotating part 112 of the fan housing 11, and the bearing structure 30 is used to support another rotating part 112 of the fan housing 11, and the fan housing 11 is rotatably arranged. The second bearing 22 is used to support the fan blade shaft 121, and both the fan housing 11 and the fan blade shaft 121 are rotatably arranged. In this way, during the operation of the air conditioner, the user can control the rotation of the fan housing 11 according to the use requirements to meet different air outlet requirements, thereby solving the problem that the air outlet direction of the fan assembly in the prior art cannot meet the user's use requirements. At the same time, the first positioning assembly arranged between the through hole 31 of the bearing structure 30 and the rotating part 112 can limit the axial movement of the fan housing 11, so that the fan housing 11 rotates within the preset area, and prevents the fan housing 11 from axially moving or moving outside the preset area.

[0040] In this embodiment, the first positioning portion 113 is arranged on the outer circumference of the rotating portion 112, and the second positioning portion 311 is arranged on the inner circumference of the through hole 31. One of the first positioning portion 113 and the second positioning portion 311 is a first protrusion, and the other of the first positioning portion 113 and the second positioning portion 311 is a first recess. The first protrusion extends into the first recess and is limited by the first recess. In this way, the above arrangement makes it easier and simpler to arrange the first positioning portion 113 and the second positioning portion 311, and reduces the processing cost and difficulty of the first positioning assembly. At the same time, the above arrangement makes the structure of the first positioning portion 113 and the second positioning portion 311 more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff.

[0041] Specifically, the first positioning portion 113 is a first protrusion, the second positioning portion 311 is a second recess, the first protrusion extends into the first recess and is limited and stopped by the first recess to ensure that the fan housing 11 rotates within a preset area.

[0042] Optionally, there is one first protrusion; or, there are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the extension direction of the through hole 31. In this way, the above arrangement makes the arrangement of the first protrusion more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff.

[0043] In this embodiment, there is only one first protrusion, so that the structure of the first protrusion is simpler, easier to process and realize, and the processing cost and difficulty of the first protrusion are reduced.

[0044] It should be noted that the number of the first protrusions is not limited thereto, and can be adjusted according to working conditions and usage requirements. Optionally, the number of the first protrusions is two, three, four, or more.

[0045] Optionally, the first protrusion is an annular protrusion, and the first recess is an annular or arc-shaped groove, and the inner diameter D1 of the annular or arc-shaped groove and the outer diameter D2 of the annular protrusion satisfy: 2D2≥D1>D2. In this way, the above arrangement makes the structure of the first protrusion and the first recess simpler, easier to process and realize, and reduces the processing cost and difficulty of the first protrusion and the first recess. At the same time, the above arrangement ensures that the fan housing 11 rotates within the preset area and does not move or move outside the preset area, and can also prevent the fan housing 11 from axial movement or displacement.

[0046] In this embodiment, the first protrusion is an annular protrusion, and the first recess is an annular groove, so that the structure of the first protrusion and the first recess is simpler, easier to process and realize, and the processing cost and difficulty of the first protrusion and the first recess are reduced.

[0047] Optionally, the first protrusion includes a plurality of arc segments spaced apart around the central axis of the through hole 31, and the first recess is an annular or arc groove, and the inner diameter D1 of the annular or arc groove and the outer diameter D2 of the arc segment satisfy: 2D2≥D1>D2. In this way, the above arrangement makes the structure of the first protrusion more diverse to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff. At the same time, the above arrangement ensures that the fan housing 11 rotates within the preset area without moving or swaying outside the preset area, and can also prevent the fan housing 11 from axial swaying or movement.

[0048] like Figures 2 to 5As shown, the air supply mechanism also includes a first driving device 60, a first gear 70 and a transmission structure 80. The first gear 70 is drivingly connected to the first driving device 60. The transmission structure 80 is arranged on the fan housing 11 of the fan assembly 10 and meshes with the first gear 70. The transmission structure 80 is a second gear or a rack. Among them, the width L1 of the first recess, the width L2 of the first protrusion and the width L3 of the second gear or rack satisfy the axial movement size μ of the fan housing 11: 0<μ=L1-L2<L3. In this way, the first driving device 60 drives the fan housing 11 to rotate through the first gear 70 and the transmission structure 80, thereby improving the driving reliability of the first driving device 60, so that the fan housing 11 rotates smoothly to avoid vibration and noise. At the same time, the above-mentioned setting between the width L1 of the first recess, the width L2 of the first protrusion, and the width L3 of the second gear or rack and the axial movement dimension μ of the fan housing 11 ensures that the first gear 70 can engage with the transmission structure 80, thereby ensuring the air supply stability of the air supply device.

[0049] Optionally, the width L1 of the first recess, the width L2 of the first protrusion, and the width L3 of the second gear or rack satisfy the following relationship with the axial movement dimension μ of the fan housing 11: 0<μ<1 / 3L3.

[0050] like Figures 8 to 10 As shown, the bearing structure 30 includes two support members 32 and a second positioning assembly that are arranged opposite to each other. Each support member 32 has a second recess, and a through hole 31 is formed around the two second recesses. The second positioning assembly is arranged between the two support members 32, and the second positioning assembly includes a third positioning portion 33 and a fourth positioning portion 34, one of the third positioning portion 33 and the fourth positioning portion 34 is a second protrusion, and the other of the third positioning portion 33 and the fourth positioning portion 34 is a second recess, and the second protrusion extends into the second recess and cooperates with the second recess in a limited manner. In this way, the two support members 32 are arranged opposite to each other and form a through hole 31 around, so that the bearing structure 30 and the rotating part 112 can be disassembled and assembled, thereby reducing the difficulty of disassembly and assembly of the two. At the same time, in the process of assembling the two support members 32, the above-mentioned setting of the second positioning assembly can achieve assembly positioning, thereby improving the assembly accuracy of the bearing structure 30.

[0051] Specifically, there are two second positioning components, which are respectively located on both sides of the through hole 31. A third positioning portion 33 and a fourth positioning portion 34 are provided on each support member 32. The third positioning portion 33 of one support member 32 cooperates with the fourth positioning portion 34 of another support member 32, and the fourth positioning portion 34 of one support member 32 cooperates with the third positioning portion 33 of another support member 32 to achieve mutual positioning between the two support members 32.

[0052] In this embodiment, the third positioning portion 33 is a second protrusion and the fourth positioning portion 34 is a second recess, so that the structures of the third positioning portion 33 and the fourth positioning portion 34 are simpler, easier to process and realize, and the processing cost and difficulty of the two are reduced.

[0053] like Fig. 9 As shown, each support member 32 includes a first plate body 321, an arc-shaped plate body 322 and a second plate body 323. The two ends of the arc-shaped plate body 322 are respectively connected to the first plate body 321 and the second plate body 323, and the inner circumferential surface of the arc-shaped plate body 322 is a second concave portion. In this way, the above arrangement not only increases the contact area between the two support members 32, but also improves the structural strength of the bearing structure 30. At the same time, the above arrangement makes the structure of each support member 32 simpler, easier to process and realize, and reduces the processing cost of the bearing structure 30.

[0054] Specifically, the first plate body 321 and the second plate body 323 have the same plate thickness and are located in the same plane. The arc-shaped plate body 322 is a semicircular arc.

[0055] Optionally, the bearing structure 30 further includes a reinforcing rib 35, which is disposed at the connection between the first plate 321 and the arc-shaped plate 322; and / or, the reinforcing rib 35 is disposed at the connection between the second plate 323 and the arc-shaped plate 322. In this way, the above arrangement makes the arrangement position of the reinforcing rib 35 more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff. At the same time, the above arrangement improves the structural strength of the bearing structure 30 and prolongs the service life of the bearing structure 30.

[0056] In this embodiment, two reinforcing ribs 35 are provided on each support member 32 , one reinforcing rib 35 is provided at the connection between the first plate body 321 and the arc-shaped plate body 322 , and the other reinforcing rib 35 is provided at the connection between the second plate body 323 and the arc-shaped plate body 322 .

[0057] Optionally, the inner diameter D4 of the first bearing 21 and the outer diameter D3 of the fan shaft 121 satisfy: 7D3≥D4>D3. Thus, the above arrangement avoids motion interference between the first bearing 21 and the fan shaft 121 and affects the normal rotation of the fan shaft 121, thereby improving the operational reliability of the air supply mechanism.

[0058] like Figures 3 to 5 As shown, the air supply device further includes a second driving device 50, which is drivingly connected to the fan blade shaft 121 to drive the fan blade shaft 121 to rotate.

[0059] like Figure 6 and Figure 7As shown, the bearing assembly 20 includes a bearing seat 23 and a bearing sleeve 24. A third protrusion is provided on the inner surface of the bearing seat 23. The bearing sleeve 24 is arranged in the bearing seat 23, and the first bearing 21 and the second bearing 22 are arranged on the bearing sleeve 24. The third protrusion is limited and stopped by the bearing sleeve 24. The first bearing 21 and the second bearing 22 are coaxially arranged. In this way, the above arrangement makes the structure of the bearing assembly 20 simpler, easier to process and realize, and reduces the processing cost of the bearing assembly 20.

[0060] Specifically, the bearing seat 23 has a mounting cavity, and the bearing sleeve 24 is disposed in the mounting cavity.

[0061] like Figure 1 As shown, the present application also provides an air conditioner indoor unit, comprising an indoor unit body 40 and an air supply mechanism, wherein the indoor unit body 40 has an air outlet. The air supply mechanism is the above-mentioned air supply mechanism.

[0062] Embodiment 2

[0063] The difference between the air supply mechanism in the second embodiment and that in the first embodiment is that the structure of the first recess is different.

[0064] like Figures 10 to 12 As shown, the first recess is an arc-shaped recess, and the central angle θ corresponding to the arc-shaped recess satisfies the following relationship with the rotation angle α of the fan housing 11: 360°≥θ≥α. In this way, the first protrusion is an arc segment, and during the rotation of the fan housing 11, the first protrusion rotates synchronously with the rotating portion 112 in the arc-shaped recess, so that the structure of the first protrusion and the first recess is more flexible to meet different usage requirements and working conditions.

[0065] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0066] The first bearing is used to support a rotating part of the fan housing, and the bearing structure is used to support another rotating part of the fan housing, and the fan housing is rotatably arranged. The second bearing is used to support the fan blade shaft, and both the fan housing and the fan blade shaft are rotatably arranged. In this way, during the operation of the air conditioner, the user can control the rotation of the fan housing according to the use requirements to meet different air outlet requirements, thereby solving the problem in the prior art that the air outlet direction of the fan assembly cannot meet the user's use requirements. At the same time, the first positioning assembly arranged between the through hole of the bearing structure and the rotating part can limit the axial movement of the fan housing, so that the fan housing rotates within the preset area, and prevents the fan housing from axially moving or moving outside the preset area.

[0067] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0068] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0070] The above description is only a preferred embodiment of the present invention and is 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 supply mechanism, arranged at the air outlet of an indoor unit of an air conditioner, characterized in that: The air supply mechanism comprises: A fan assembly (10) comprises a fan housing (11) and a fan blade (12) arranged in the fan housing (11), wherein the fan housing (11) comprises a housing body (111) and two rotating parts (112), each of the rotating parts (112) being arranged on two sides of the housing body (111), and a fan blade shaft (121) of the fan blade (12) passing through the two rotating parts (112); A bearing assembly (20) is located on a first side of the fan assembly (10), the bearing assembly (20) comprising a first bearing (21) and a second bearing (22), one of the rotating parts (112) extending into the first bearing (21), and the fan blade shaft (121) extending into the second bearing (22); A bearing structure (30) is located on a second side of the fan assembly (10), the bearing structure (30) having a through hole (31), and the other rotating portion (112) extends into the through hole (31); a first positioning assembly, arranged between the through hole (31) and the other rotating portion (112), the first positioning assembly comprising a first positioning portion (113) and a second positioning portion (311), the first positioning portion (113) and the second positioning portion (311) being limit stops so as to enable the fan housing (11) to rotate within a preset area; The first positioning portion (113) is arranged on the outer circumferential surface of the rotating portion (112), and the second positioning portion (311) is arranged on the inner circumferential surface of the through hole (31), one of the first positioning portion (113) and the second positioning portion (311) is a first protrusion, and the other of the first positioning portion (113) and the second positioning portion (311) is a first recess, and the first protrusion extends into the first recess and is stopped by the first recess; The air supply mechanism also includes: A first driving device (60); A first gear (70) drivingly connected to the first driving device (60); A transmission structure (80) is arranged on the fan housing (11) of the fan assembly (10) and meshes with the first gear (70), wherein the transmission structure (80) is a second gear or a rack; wherein the width L1 of the first recess, the width L2 of the first protrusion, and the width L3 of the second gear or rack satisfy the following relationship with the axial play dimension μ of the fan housing (11): 0<μ=L1-L2<L3.

2. The air supply mechanism according to claim 1, characterized in that: There is one first protrusion; or there are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the extension direction of the through hole (31).

3. The air supply mechanism according to claim 1, characterized in that: The first protrusion is an annular protrusion, the first recess is an annular or arcuate groove, and the inner diameter D1 of the annular or arcuate groove and the outer diameter D2 of the annular protrusion satisfy: 2D2≥D1>D2.

4. The air supply mechanism according to claim 1, characterized in that: The first protrusion comprises a plurality of arc segments spaced apart around the central axis of the through hole (31); the first recess is an annular or arc groove; the inner diameter D1 of the annular or arc groove and the outer diameter D2 of the arc segment satisfy the following relationship: 2D2≥D1>D2.

5. The air supply mechanism according to claim 1, characterized in that: The width L1 of the first recess, the width L2 of the first protrusion, and the width L3 of the second gear or rack satisfy the following relationship with the axial play dimension μ of the fan housing (11): 0<μ<1 / 3L3.

6. The air supply mechanism according to claim 1, characterized in that: The bearing structure (30) comprises: Two supporting members (32) arranged opposite to each other, each supporting member (32) having a second recess, and the through hole (31) is formed around the two second recesses; The second positioning assembly is arranged between the two support members (32), and the second positioning assembly comprises a third positioning portion (33) and a fourth positioning portion (34), one of the third positioning portion (33) and the fourth positioning portion (34) is a second protrusion, the other of the third positioning portion (33) and the fourth positioning portion (34) is a second recess, and the second protrusion extends into the second recess and is limitedly matched with the second recess.

7. The air supply mechanism according to claim 6, characterized in that: Each of the support members (32) comprises a first plate body (321), an arc-shaped plate body (322) and a second plate body (323); two ends of the arc-shaped plate body (322) are respectively connected to the first plate body (321) and the second plate body (323); an inner circumferential surface of the arc-shaped plate body (322) is the second recess; the bearing structure (30) further comprises a reinforcing rib (35), the reinforcing rib (35) being arranged at a connection between the first plate body (321) and the arc-shaped plate body (322); and / or the reinforcing rib (35) being arranged at a connection between the second plate body (323) and the arc-shaped plate body (322).

8. The air supply mechanism according to claim 1, characterized in that: The inner diameter D4 of the first bearing (21) and the outer diameter D3 of the fan blade shaft (121) satisfy the following relationship: 7D3≥D4>D3.

9. The air supply mechanism according to claim 1, characterized in that: The first recessed portion is an arc-shaped groove, and the central angle θ corresponding to the arc-shaped groove and the rotation angle α of the fan housing (11) satisfy the following relationship: 360°≥θ≥α.

10. An air conditioner indoor unit, characterized in that: It comprises an indoor unit body (40) and an air supply mechanism, wherein the indoor unit body (40) has an air outlet; wherein the air supply mechanism is the air supply mechanism according to any one of claims 1 to 9.

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