Air conditioner indoor unit

Abstract

The application discloses an air conditioner indoor unit. The air conditioner indoor unit of the embodiment of the application forms a first reinforcing rib and a second reinforcing rib between a surrounding plate part and a mounting table part of a bottom plate, improves the structural strength and rigidity of the bottom plate, reduces load displacement and stress, improves the inherent frequency of the assembly, and effectively avoids resonance. A recessed surface part and a convex surface part are formed between the surrounding plate part and the mounting table part, the recessed surface part forms the first reinforcing rib, and the convex surface part forms the second reinforcing rib. The recessed surface part is formed by an outer curved surface part at the periphery and an inner flat surface part at the inner side, the outer curved surface part is gradually deepened, material flow can be improved, and the risk of cracking can be reduced; the inner flat surface part is convenient for adapting the installation of the fan, and the installation of the fan is more stable. The first reinforcing rib is formed in a curved type extension, which is beneficial to reducing stress concentration under forming and load, improving load area, and reducing the problem of anisotropy caused by deep drawing after forming, thereby avoiding strong warping deformation of parts.

Description

Technical Field

[0001] This application relates to the field of air temperature regulation technology, and more particularly to an indoor air conditioning unit. Background Technology

[0002] Ceiling-mounted air conditioner indoor units, also known as cassette-mounted air conditioner indoor units or simply ceiling units, are a type of air conditioner indoor unit that is installed embedded in the ceiling of a room. They are widely used due to their aesthetic appeal and ability to free up floor and wall space.

[0003] In related technologies, the base plate of a ceiling-mounted ceiling machine uses a star-shaped, radially arranged reinforcing rib to improve its rigidity. However, during lightweight design, the base plate thickness is reduced, and the use of a star-shaped, radially arranged reinforcing rib results in severe warping, stress concentration, and a high susceptibility to tearing. Summary of the Invention

[0004] This application provides an air conditioner indoor unit that improves the rigidity of the base plate while also enhancing the reliability of the base plate forming process.

[0005] This application provides an indoor unit for an air conditioner, which includes:

[0006] Fans provide the power for indoor air circulation;

[0007] A base plate, on the bottom surface of which the fan is mounted, the base plate comprising:

[0008] The base edge is ring-shaped;

[0009] A surrounding edge portion is connected to the inner side of the base edge portion, and the surrounding edge portion protrudes in a first direction relative to the base edge portion;

[0010] A plurality of first reinforcing ribs and a plurality of second reinforcing ribs are provided. A portion of the perimeter portion is recessed relative to the base edge portion in a second direction, forming a recessed surface and a convex surface. The plurality of first reinforcing ribs are formed in the recessed surface portion, and the plurality of second reinforcing ribs are formed in the convex surface portion. The plurality of first reinforcing ribs and the plurality of second reinforcing ribs are arranged alternately along the periphery of the perimeter portion. The first direction and the second direction are opposite and both are perpendicular to the thickness direction of the base edge portion.

[0011] The mounting platform is located at the center of the surrounding portion; the mounting platform is fixedly connected to the fan; the mounting platform protrudes in the first direction relative to the recessed surface.

[0012] The recessed surface includes an outer curved surface and an inner flat surface. The outer curved surface surrounds the outer side of the inner flat surface, and the recessed depth of the outer curved surface is smaller at the inner end than at the outer end.

[0013] The side edges of the first reinforcing rib and the second reinforcing rib extend along a curve; the first reinforcing rib includes:

[0014] Two first extensions are arc-shaped and protrude away from each other; there is a gap between the two first extensions, and the outer ends of the two first extensions extend toward the surrounding edge; the gap between the two first extensions increases from the mounting platform to the surrounding edge.

[0015] The second extension has two ends connected to the inner ends of the two first extensions respectively. The side of the second extension facing the mounting platform is connected to the mounting platform. The second extension is arc-shaped away from the inner side of the mounting platform and protrudes towards the mounting platform.

[0016] With the above configuration, a mounting platform is formed on the base plate for installing the fan. A first and second reinforcing rib are formed between the base plate's surrounding plate and the mounting platform, improving the structural strength and rigidity of the base plate, reducing load displacement and stress, and increasing the component's natural frequency to effectively avoid resonance. A recessed surface and a protruding surface are formed between the surrounding plate and the mounting platform. The recessed surface forms the first reinforcing rib, and the protruding surface forms the second reinforcing rib. The recessed surface is formed by an outer curved surface and an inner flat surface. The outer curved surface is gradually deepened, which improves material flow and reduces the risk of cracking; the inner flat surface facilitates fan installation, making the fan installation more stable.

[0017] The first reinforcing rib includes two first extensions and one second extension. The two first extensions are arc-shaped, and the inner side of the second extension is arc-shaped, so that the first reinforcing rib forms a curved extension. This helps to reduce stress concentration under molding and load. The curved extension also helps to increase the load area, improve the effective distribution of the reinforcing rib, and reduce the number of reinforcing ribs. This also helps to move the bottom plate material flow to the middle of the mold during molding, and reduce the strong warping deformation of the parts caused by anisotropy problems due to deep drawing after molding.

[0018] Furthermore, the outward expansion structure at the outer ends of the two first extensions facilitates the decomposition and guidance of forming stress and load, improves material flow, and reduces wrinkles caused by material accumulation and thinning cracks caused by excessive stretching. Moreover, the two arc-shaped second extensions make the strain (deformation) distribution in this region more uniform.

[0019] The second extension connects to the mounting platform, thereby bearing the load of the fan on the mounting platform and transmitting the load to the two second extensions respectively. This ensures that the dynamic load is quickly and smoothly distributed to the entire base plate, avoiding local stress concentration, thus significantly reducing vibration and noise, and significantly improving the durability and reliability of the base plate.

[0020] In some embodiments of this application, the outer side of the end where the two first extensions are connected to the surrounding edge protrudes outward to form a first protrusion, so that the angle between the outer side of the first extension and the surrounding edge is not an acute angle.

[0021] In this way, the connection area between the first extension and the surrounding edge can be increased, which is conducive to the outward dissipation of stress; the angle between the outer side of the first extension and the surrounding edge is not an acute angle, which reduces the probability of stress concentration; moreover, it is convenient to form and easy to demold.

[0022] In some embodiments of this application, the first reinforcing rib further includes:

[0023] The third extension extends circumferentially along the mounting platform and connects to the second extensions of two adjacent first reinforcing ribs.

[0024] A fourth extension is connected to one end of the two first extensions that is away from the second extension, and the fourth extension extends along the edge of the surrounding portion.

[0025] This configuration allows the fan force on the mounting platform to be evenly transmitted from the third and second extensions toward the first extension, facilitating stress outward and reducing the possibility of stress concentration.

[0026] In some embodiments of this application, the first reinforcing rib further includes a fourth extension, which is connected to one end of the two first extensions away from the second extension, and extends along the edge of the surrounding portion.

[0027] The first extension is located away from the outer end of the mounting platform and is indirectly connected to the surrounding edge via the fourth extension. The fourth extension extends the second protruding edge of the surrounding edge to increase the connection area between the first reinforcing rib and the surrounding edge, thus facilitating better stress transfer.

[0028] In some embodiments of this application, the surrounding portion includes a plurality of straight edges, which are connected end to end in sequence.

[0029] Each of the straight edges is connected to one end of one of the second reinforcing ribs that is away from the mounting platform.

[0030] One first reinforcing rib is provided between each two adjacent straight edges.

[0031] With the above arrangement, the first and second reinforcing ribs are alternately arranged, and both the second reinforcing rib and the second protruding edge protrude in the first direction relative to the base edge. The straight edge of the second reinforcing rib corresponds to the straight edge of the second protruding edge, which can better guide stress outward and transfer load. The first reinforcing rib is set at the transition edge, which allows the force flow to smoothly turn from one straight edge to another, avoiding abrupt changes and accumulation of force at the transition edge; moreover, the first reinforcing rib can guide the force towards the straight edges on both sides, which helps to disperse the force and avoid local overload.

[0032] In some embodiments of this application, the second reinforcing rib includes:

[0033] Two first ribs, the two first ribs being arc-shaped toward each other's inner side and protruding toward each other; the two first ribs being spaced apart, and the outer ends of the two first ribs extending to the surrounding edge;

[0034] The second rib has an arc-shaped inner side that protrudes toward the mounting platform; both ends of the second rib are connected to the two first ribs respectively.

[0035] The second reinforcing rib in this embodiment includes two first ribs and one second rib, both of which have arc-shaped inner sides, so that the second reinforcing rib extends in a curved manner. This helps to increase the strength and rigidity of the base plate structure and avoid stress concentration.

[0036] In some embodiments of this application, in the projection of the base plate onto the first plane, a straight line parallel to the first horizontal direction and located at the center of the base plate in the second horizontal direction is defined as the first center line, and a straight line parallel to the second horizontal direction and located at the center of the base plate in the first horizontal direction is defined as the second center line; wherein, the first horizontal direction and the second horizontal direction are perpendicular and both are parallel to the first plane;

[0037] Define the straight line passing through the center of the arc of the second rib and the midpoint of the second rib as the centerline of the first rib;

[0038] The centerline of the first rib of a portion of the second reinforcing rib is parallel to the first centerline and is spaced apart from the first centerline.

[0039] In another portion, the centerline of the first rib of the second reinforcing rib is parallel to the second centerline and is spaced apart from the second centerline.

[0040] This design increases the flexibility of the second reinforcing rib's placement, allowing its position to be adjusted according to the asymmetrical structure of the indoor unit, which is beneficial for stress dissipation.

[0041] In some embodiments of this application, the protruding face also forms a third reinforcing rib, the third reinforcing rib being located inside the second reinforcing rib; and the third reinforcing rib being connected to the surrounding edge.

[0042] By setting a third reinforcing rib inside the second reinforcing rib, the structural strength and stiffness of this area are increased.

[0043] In some embodiments of this application, in the projection of the base plate onto the first plane, a straight line parallel to the first horizontal direction and located at the center of the base plate in the second horizontal direction is defined as the first center line, and a straight line parallel to the second horizontal direction and located at the center of the base plate in the first horizontal direction is defined as the second center line; wherein, the first horizontal direction and the second horizontal direction are perpendicular and both are parallel to the first plane;

[0044] The straight line passing through the center of the arc of the second extension and the midpoint of the second extension is defined as the centerline of the second rib.

[0045] The angle between the centerline of the second rib and the centerline of the second rib is 40° to 50°.

[0046] In this embodiment of the application, by limiting the relative position of the first reinforcing rib and the second center line, the arrangement of the first reinforcing rib is flexible and the position can be adjusted according to the actual situation.

[0047] In some embodiments of this application, the mounting platform includes:

[0048] The platform body is circular; the platform body protrudes in the first direction relative to the recessed surface.

[0049] The second protrusion protrudes in the first direction relative to the platform body portion;

[0050] Multiple fixing parts are arranged at intervals along the circumference of the platform body; the fixing parts protrude relative to the platform body towards the second direction; the fixing parts are fixedly connected to the fan.

[0051] The mounting platform in this embodiment of the application, by providing a platform body and a second protrusion protruding in a first direction and a fixing part protruding in a second direction, helps to improve the structural rigidity of the mounting platform and reduce the effect of resonance. The fixing part also serves to position the fan during installation.

[0052] In some embodiments of this application, the perimeter portion includes:

[0053] A first protruding edge protrudes in the first direction relative to the base edge, and the first protruding edge is connected to the inner side of the base edge.

[0054] A second protruding edge protrudes in the first direction relative to the first protruding edge, and the second protruding edge is connected to the inner side of the first protruding edge; the second protruding edge includes:

[0055] The edge body is annular and connected to the inner side of the first protruding edge.

[0056] A plurality of first protruding ribs are connected to the side body and extend toward the first protruding side portion; the plurality of first protruding ribs are arranged at intervals along the side body; the plurality of first protruding ribs are spaced apart from the base side portion;

[0057] A plurality of second protruding ribs are connected to the side body and extend toward the first protruding side to connect with the base side. The plurality of first protruding ribs are arranged at intervals along the side body.

[0058] The second protruding edge of this application embodiment further enhances the strength of the base plate and suppresses vibration by providing a first protruding rib and a second protruding rib around the periphery of the side body that fixes the heat exchanger. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the structure of an air conditioner indoor unit provided in an embodiment of this application;

[0060] Figure 2 for Figure 1 A cross-sectional schematic diagram of the indoor unit of a central air conditioner;

[0061] Figure 3 This is a schematic diagram of the structure of the base plate provided in the embodiments of this application;

[0062] Figure 4 This is a schematic diagram of the drawing direction of the base plate provided in an embodiment of this application;

[0063] Figure 5 A schematic cross-sectional view of the base plate provided in an embodiment of this application;

[0064] Figure 6 A schematic diagram of the mounting platform of the base plate provided in the embodiments of this application;

[0065] Figure 7 This is a schematic diagram of the structure of the base plate provided in the embodiments of this application;

[0066] Figure 8This is a schematic diagram of the structure of the base plate provided in the embodiments of this application;

[0067] Figure 9 This is a partial dimension diagram of the base plate provided in an embodiment of this application;

[0068] Figure 10 This is a partial dimension diagram of the base plate provided in an embodiment of this application;

[0069] Figure 11 This is a partial dimension diagram of the base plate provided in an embodiment of this application;

[0070] Figure 12 Displacement distribution cloud map of the base plate provided in the embodiments of this application;

[0071] Figure 13 Stress distribution cloud diagram of the base plate provided in the embodiments of this application;

[0072] Figure 14 A deep drawing simulation cloud diagram of the base plate provided in the embodiments of this application.

[0073] Explanation of reference numerals in the attached figures:

[0074] 10: Body; 11: Fan; 12: Heat exchanger; 13: Enclosure; 14: Thermal insulation; 15: Drain tray; 20: Panel; 21: Air outlet; 22: Air return outlet;

[0075] 100: Base plate; 110: Base edge; 120: Surrounding edge; 121: First protruding edge; 122: Second protruding edge; 1221: Edge body; 1222: First protruding rib; 1223: Second protruding rib; 1224: Straight edge; 1225: Transition edge; 130: Recessed surface; 131: Outwardly curved surface; 132: Inner plane; 140: Protruding surface; 150: First reinforcing rib; 151: First extension 152: Second extension; 153: First protrusion; 154: Third extension; 155: Fourth extension; 160: Second reinforcing rib; 161: First rib; 162: Second rib; 170: Mounting platform; 171: Platform body; 172: Second protrusion; 1721: First arc segment; 1722: Second arc segment; 173: Fixing part; 174: Positioning part; 180: Third reinforcing rib; 190: Flanged edge. Detailed Implementation

[0076] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0077] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0078] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0079] The base plate 100, as the core skeleton component of the ceiling-mounted air conditioning unit, provides installation positions for the fan 11, heat exchanger 12, electrical components, and other parts. The design strength of the base plate 100 determines the overall structure and operational stability of the unit; therefore, the rigidity design of the base plate 100 is particularly important.

[0080] The base plate 100, as a thin-plate component, is typically formed by pressing a substrate. In related technologies, a star-shaped radial protrusion is usually formed on the substrate to create reinforcing ribs, thereby increasing the rigidity and strength of the base plate 100.

[0081] However, in the robust design of the base plate 100, when a thin high-strength substrate is used to form the base plate 100, there are problems such as difficulty in improving stiffness, severe warping, stress concentration, large displacement, accumulation of the first ten modes, and easy tearing.

[0082] In view of this, the present application provides an air conditioner indoor unit, the base plate 100 of which adopts an irregular asymmetrical pressing design to form a curved reinforcing rib structure, thereby improving the rigidity of the base plate 100, reducing load displacement and stress, and increasing the natural frequency of the component, so as to effectively avoid resonance and solve the problems of tearing defects and strength reduction in thin plate materials.

[0083] The base plate 100 of this application embodiment can be applied to a thin plate material of 0.6~0.8mm, for example, a thin plate material of 0.65mm, such as DC51 material, while ensuring structural strength.

[0084] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0085] Combination Figure 1 and Figure 2This application provides an indoor air conditioner unit, which includes a body 10 and a panel 20. An air outlet 21 and a return air inlet 22 are formed on the panel 20. The air outlet 21 blows the heat-exchanged airflow towards the room, and the return air inlet 22 allows the airflow from the room to enter the body 10.

[0086] For example, four air outlets 21 are provided, located in the four directions of the panel 20, surrounding the return air inlet 22. When the panel 20 is rectangular, one air outlet 21 is provided on each side of the panel 20. In this way, a four-directional air outlet structure is formed.

[0087] The main body 10 includes a base plate 100, which serves as a basic frame and provides direct or indirect support to other components of the main body 10.

[0088] The main body 10 also includes a fan 11, which is fixed to the bottom surface of the base plate 100 and provides power for indoor air circulation. Specifically, under the action of the fan 11, air inside the main body 10 enters the room through the air outlet 21, and indoor air returns to the main body 10 through the air return outlet 22.

[0089] The main body 10 also includes a surrounding plate 13, which is fixedly connected to the base plate 100, providing a relatively enclosed space for the internal structure of the main body 10. The bottom end of the surrounding plate 13 is open. The panel 20 is fixed to the bottom end of the surrounding plate 13, closing the opening at the bottom end of the outer shell.

[0090] The main body 10 also includes a heat exchanger 12, which is installed inside the outer casing and serves to exchange heat with the air. A water receiving tray 15 is provided at the bottom of the heat exchanger 12 to collect the condensate generated during heat exchange. The heat exchanger 12 is located inside the enclosure 13 and is fixedly connected to the enclosure 13.

[0091] A thermal insulation barrier 14 is provided on the bottom surface of the base plate 100 to reduce heat transfer and decrease heat conduction between the interior of the air conditioner indoor unit and the external environment. For example, the thermal insulation barrier 14 can be a heat insulation device such as plastic foam.

[0092] In some embodiments, the enclosure 13 includes an outer shell portion and a heat insulation portion. When the heat insulation portion is made of plastic foam, the top end of the heat insulation portion can be bent and extended toward the fan 11 to form a thermal insulation barrier 14.

[0093] Combination Figure 3 In this embodiment, the base plate 100 is formed using a multi-stage deep drawing process, resulting in a one-piece molding of the base plate 100 with high structural integrity and strength. Furthermore, the multi-stage deep drawing process creates drawing depths of varying degrees, preventing material tearing and excessive thinning, facilitating the formation of complex geometric shapes; it also allows for control of material flow and thickness distribution, thereby improving production stability and yield.

[0094] Continue to refer to Figure 3 The base plate 100 includes a base edge portion 110, which is annular. When the base plate 100 is formed by deep drawing of a substrate, the base edge portion 110 may be the undrawn portion of the substrate.

[0095] The base plate 100 also includes a perimeter portion 120, which is connected to the inner side of the base edge portion 110 and protrudes in a first direction relative to the base edge portion 110.

[0096] The perimeter portion 120 includes a first protruding edge portion 121, which protrudes in a first direction relative to the base edge portion 110 and is connected to the inner side of the base edge portion 110.

[0097] The surrounding edge 120 also includes a second protruding edge 122, which protrudes in a first direction relative to the first protruding edge 121, and the second protruding edge 122 is connected to the inner side of the second protruding edge 122.

[0098] The thermal insulation resistance 14 of the indoor unit of the air conditioner is in close contact with the first protruding edge 121 and the second protruding edge 122 to ensure the heat insulation effect. The projection of the heat exchanger 12 on the base plate 100 is located at the second protruding edge 122.

[0099] In this embodiment, the edge portion 120 is formed by two-stage drawing to create a first protruding edge 121 and a second protruding edge 122. This avoids excessive deformation during a single drawing, reduces local stress concentration, and prevents the material from thinning or even cracking at corners or edges due to excessive stretching. The material flow is smoother and more controllable.

[0100] Continue to refer to Figure 3 The second protruding edge 122 includes an edge body 1221, which is annular and connected to the inner side of the first protruding edge 121. The edge body 1221 is opposite to the heat exchanger 12.

[0101] For example, the edge body 1221 may include four straight edges 1224 and a transition edge 1225 connecting two adjacent straight edges 1224. The structure is simple in shape and easy to draw.

[0102] The second protruding edge 122 also includes a plurality of first protruding ribs 1222, which are connected to the edge body 1221 and extend toward the first protruding edge 121; the plurality of first protruding ribs 1222 are arranged at intervals along the edge body 1221; the plurality of first protruding ribs 1222 are spaced apart from the base edge 110.

[0103] For example, each straight edge 1224 of the edge body 1221 may be provided with two first protruding ribs 1222.

[0104] The second protruding edge 122 also includes a plurality of second protruding ribs 1223, which are connected to the edge body 1221 and extend toward the first protruding edge 121 to connect with the base edge 110. The plurality of first protruding ribs 1222 are arranged at intervals along the edge body 1221.

[0105] For example, a second protruding rib 1223 is provided on a portion of the transition edge 1225 of the edge body 1221.

[0106] The second protruding edge 122 of this application embodiment, by providing a first protruding rib 1222 and a second protruding rib 1223 around the periphery of the side body 1221 of the fixed heat exchanger 12, further enhances the strength of the base plate 100 and suppresses vibration generation.

[0107] In some embodiments, the width D8 of the first protruding rib 1222 is 50mm to 60mm. The distance D9 between the edge of the first protruding rib 1222 and the edge of the first protruding edge 121 is 20mm to 30mm. The width D8 and the distance D9 can be determined by combining static simulation and molding analysis, and are not limitations on the size of the first protruding rib 1222.

[0108] A portion of the area within the perimeter 120 is recessed relative to the base 110 in a second direction, forming a recessed face 130 and a protruding face 140.

[0109] It should be noted that, since the base plate 100 is formed by a deep drawing process, the structure on the base plate 100 is a protruding structure on the side facing the first direction, and the corresponding position on the side facing the second direction is a recessed structure; the concave structure on the side facing the first direction is a protruding structure on the side facing the second direction.

[0110] The base plate 100 also includes a mounting platform 170 located at the center of the perimeter 120; the mounting platform 170 is fixedly connected to the fan 11; the mounting platform 170 protrudes in a first direction relative to the recessed surface 130.

[0111] The first direction and the second direction are opposite and both are perpendicular to the thickness direction of the base edge 110. The first direction is defined as the positive direction and the second direction as the negative direction.

[0112] Combination Figure 4The first protruding edge 121 is drawn in the first stage, with the drawing occurring in the positive plane relative to the base edge 110; the second protruding edge 122 is drawn in the second stage, with the drawing occurring in the positive plane relative to the base edge 110. The recessed surface 130 is drawn in the third stage, with the drawing occurring in the negative plane relative to the base edge 110. At least a portion of the recessed surface is drawn with a gradual curvature. The mounting platform 170 is drawn in the fourth stage, with the drawing occurring in the negative plane relative to the base edge 110.

[0113] The term "gradual drawing" for curved surfaces can be understood as a gradual increase in drawing depth from the edge of the base plate 100 towards the center. Combined with... Figure 4 From the edge of the base plate 100 toward the center, the drawing depth decreases.

[0114] In the section between the perimeter 120 and the mounting platform, which serves as the area for the subsequent formation of the reinforcing rib structure, at least a portion of the recessed surface 130 employs a gradually tapered curved surface drawing technique. This significantly improves material flow and reduces the risk of cracking. The gradually tapered curved surface drawing also allows for smoother material flow, reducing wrinkling. Furthermore, the gradually tapered curved surface drawing results in uniform and continuous deformation of the material chamber, with a smooth strain path, which improves the surface quality and rigidity of the base plate 100 and enhances shape stability.

[0115] For example, with the base edge 110 as zero, the depth of the first stage of drawing is 4mm to 6mm, the depth of the second stage of drawing is 7mm to 9mm, the depth of the third stage of drawing is -4mm to -8mm, and the depth of the fourth stage of drawing is -2mm to -4mm.

[0116] The base plate 100 in this embodiment adopts bidirectional multi-step transition deep drawing. Multi-step deep drawing is beneficial for the material flow to flow towards the center of the base plate 100 during the forming of the base plate 100. While generating a hardening effect through sufficient deep drawing, it reduces the material thinning rate.

[0117] It should be noted that the first to fourth stages of drawing described above are only descriptions of the drawing of the base plate 100, and do not mean that only the above four drawing stages are required to form the base plate 100 structure of this application embodiment. In fact, based on the above four drawing stages, some detailed drawing is also required to form the base plate 100 structure of this application embodiment.

[0118] For example, combining Figure 5 The surface of the protruding part 140 facing the first direction is lower than the surface of the second protruding edge 122 facing the first direction. Therefore, a smaller drawing is required on the protruding part 140 to create a height difference between the two surfaces. This strengthens the structure, increases rigidity, raises the natural frequency, avoids the resonance point of the fan 11, and reduces resonance. It also meets the drop strength requirements during transportation.

[0119] For example, combining Figure 3 and Figure 5 The drawing process includes creating mounting holes on the mounting platform 170 and drawing to increase rigidity.

[0120] In some embodiments, the mounting platform 170 includes a platform body 171, which is circular. The platform body 171 protrudes in a first direction relative to the recessed panel 20. The center of the platform body 171 coincides with the center of the base plate 100.

[0121] The mounting platform 170 may further include a second protrusion 172, which protrudes in a first direction relative to the platform body 171. The second protrusion 172 may be located at the center of the platform body 171.

[0122] The mounting platform 170 may further include a plurality of fixing parts 173, which are arranged at intervals along the circumference of the platform body 171; the fixing parts 173 protrude in a second direction relative to the platform body 171. The fixing parts 173 are fixedly connected to the fan 11.

[0123] For example, three fixing parts 173 are provided, and the three fixing parts 173 are evenly spaced along the circumference of the platform body 171.

[0124] The mounting platform 170 of this embodiment, by providing a platform body 171, and on the platform body 171 providing a second protrusion 172 protruding in a first direction and a fixing part 173 protruding in a second direction, facilitates the improvement of the structural rigidity of the mounting platform and reduces the effect of resonance. The fixing part 173 also serves to position the fan 11 during installation.

[0125] In some embodiments, the edge of the second protrusion 172 extends in a curve, for example, the edge of the second protrusion 172 is a multi-segment tangentially connected arc.

[0126] For example, combined Figure 6 The edge of the second protrusion 172 includes three first arc segments 1721, which protrude toward the center of the platform body 171 and are evenly spaced around the center of the platform body 171. The edge of the second protrusion 172 also includes three second arc segments 1722, which protrude outwards from the center of the platform body 171 and are tangentially connected to two adjacent first arc segments 1721. This arrangement makes the edge of the second protrusion 172 smooth, facilitating stress relief.

[0127] The fixing part 173 extends from the outer end of the platform body 171 to the edge of the platform body 171, and there is a gap between the inner end of the fixing part 173 facing the platform body 171 and the second protrusion 172. The inner end of the fixing part 173 facing the platform body 171 is opposite to the first arc segment 1721 of the second protrusion 172, so that there is sufficient space for the fixing part 173 to avoid the fixing part 173 and the second protrusion 172 being too close, which would easily cause them to tear.

[0128] The fixing part 173 is partially recessed in the second direction to form a circular positioning part 174, which facilitates the installation, positioning and welding of the fan 11.

[0129] Continue to refer to Figure 5 The base plate 100 may also include a flange 190, which bends and extends in a second direction relative to the base edge 110, and is used to fix it to the outer shell portion of the enclosure 13.

[0130] Continue to refer to Figure 3 The base plate 100 in this embodiment further includes a plurality of first reinforcing ribs 150 and a plurality of second reinforcing ribs 160. The plurality of first reinforcing ribs 150 are formed within the recessed portion 130, and the plurality of second reinforcing ribs 160 are formed within the protruding portion 140. Thus, the first reinforcing ribs 150 and the second reinforcing ribs 160 are located between the edge portion 120 and the mounting platform portion 170, and the protruding directions of the first reinforcing ribs 150 and the second reinforcing ribs 160 are different. The two types of reinforcing ribs work together to provide bidirectional bending stiffness, which is beneficial for meeting the drop stiffness requirements during transportation. Furthermore, the different protruding directions of the first reinforcing ribs 150 and the second reinforcing ribs 160 facilitate demolding.

[0131] Multiple first reinforcing ribs 150 and multiple second reinforcing ribs 160 are alternately arranged along the periphery of the edge portion 120. This helps to evenly distribute stress and avoid stress concentration. Moreover, it also helps to form a stable spatial grid structure and improve overall stiffness.

[0132] In some embodiments of this application, the perimeter portion 120 includes a plurality of straight edges 1224, which are connected end to end in sequence. The second protruding edge 122 of the perimeter portion 120 includes a plurality of straight edges 1224, with adjacent straight edges 1224 indirectly connected in sequence via transition edges 1225.

[0133] For example, four straight edges 1224 are provided, and the extension directions of two adjacent straight edges 1224 are perpendicular.

[0134] Each straight edge 1224 is connected to one end of a second reinforcing rib 160 away from the mounting platform 170; a first reinforcing rib 150 is provided between every two adjacent straight edges 1224. Each transition edge 1225 is provided with a first reinforcing rib 150.

[0135] With the above arrangement, the first reinforcing rib 150 and the second reinforcing rib 160 are alternately arranged, and both the second reinforcing rib 160 and the second protruding edge 122 protrude in the first direction relative to the base edge 110. The second reinforcing rib 160 corresponds to the straight edge 1224 of the second protruding edge 122, which can better guide stress outward and transfer load. The first reinforcing rib 150 is arranged at the transition edge 1225, which allows the force flow to smoothly turn from one straight edge 1224 to another straight edge 1224, avoiding the abrupt turning and accumulation of force at the transition edge 1225; moreover, the first reinforcing rib 150 can guide the force towards the straight edges 1224 on both sides, which is beneficial to disperse the force and avoid local overload.

[0136] In some embodiments, the sides of the first reinforcing rib 150 and the second reinforcing rib 160 extend along a curve. This configuration allows the curved reinforcing ribs to better guide and transmit force flow, making force transmission smoother; it also avoids stress concentration at corners, thereby significantly improving the fatigue life and structural reliability of the parts.

[0137] In this embodiment, a portion of the first reinforcing rib 150 is located on the outer curved portion 131, and the remaining portion is located on the inner flat portion 132. This design allows both the first reinforcing rib 150 and the second reinforcing rib 160 to have variable cross-sectional heights, which is beneficial for molding high-strength, low-elongation sheets and preventing sheet tearing. The cross-sectional heights of the first reinforcing rib 150 and the second reinforcing rib 160 are 7mm to 14mm. The cross-sectional height is larger at the outer end near the edge portion 120 and smaller at the inner end near the mounting platform portion 170. The cross-sectional height can be understood as the dimension of the first reinforcing rib 150 and the second reinforcing rib 160 along the thickness direction of the base plate 100.

[0138] Reference Figure 7 The recessed surface 130 includes an outer curved surface 131 and an inner flat surface 132. The outer curved surface 131 surrounds the outer side of the inner flat surface 132, and the inner flat surface 132 surrounds the outer side of the mounting platform 170, facilitating the installation of the fan 11. The distance between the surface of the platform body 171 of the mounting platform 170 and the inner flat surface 132 can be 5mm to 7mm.

[0139] The inner end of the concave depth of the outer curved surface 131 is smaller than that of the outer end. A gradual deepening is formed in the outer curved surface 131.

[0140] The outer curved surface 131 is arc-shaped and smooth and continuous; the outer curved surface 131 and the inner flat surface 132 are tangentially connected, which facilitates the transmission of stress.

[0141] In this embodiment, the recessed surface 130 is formed by an outer curved surface 131 and an inner flat surface 132. The outer curved surface 131 is gradually deepened, which can improve material flow and reduce the risk of cracking. The inner flat surface 132 is easy to adapt to the installation of the fan 11, making the installation of the fan 11 more stable.

[0142] Therefore, in this embodiment, the base plate 100 is established with the geometric center as the forming point, and the forming point is distributed in a curved shape. This distribution shape is conducive to reducing stress concentration under forming and load. The curved distribution is also conducive to increasing the load area, improving the effective distribution of reinforcing ribs while reducing the number of reinforcing ribs. It is also conducive to the material flow of the base plate 100 moving to the middle of the mold during forming, reducing the strong warping deformation of parts caused by anisotropy problems due to deep drawing after forming.

[0143] Reference Figure 8 The first reinforcing rib 150 includes two first extensions 151, which are arc-shaped and protrude away from each other. There is a gap between the two first extensions 151, and the outer ends of the two first extensions 151 extend towards the perimeter portion 120. From the mounting platform portion 170 to the perimeter portion 120, the gap between the two first extensions 151 increases, causing the two first extensions 151 to expand outward from the center, extending towards the two straight edges 1224 respectively. This facilitates the first extensions 151 in guiding stress towards the straight edges 1224 on both sides, and allows the two first extensions 151 to cover a wider fan-shaped area, more effectively dispersing stress. Furthermore, the outwardly expanding two first extensions 151 provide a broad support base for the mounting platform portion 170, which helps to improve the overall structural rigidity, thereby increasing the natural frequency and reducing the possibility of resonance with the fan 11.

[0144] Since part of the first extension 151 is located on the outer curved part 131 and the other part is located on the inner flat part 132, the two first extensions 151 form a stable "arch" support, which helps to increase the structural stiffness and strength and increase the compressive strength.

[0145] The first reinforcing rib 150 also includes a second extension 152. The two ends of the second extension 152 are respectively connected to the inner ends of the two first extensions 151. The side of the second extension 152 facing the mounting platform 170 is connected to the mounting platform 170. The side of the second extension 152 facing away from the inner side of the mounting platform 170 is arc-shaped and protrudes towards the mounting platform 170.

[0146] The second extension 152 can transmit the force of the mounting platform 170 to the two second extensions 152 respectively. The inner side of the second extension 152 extends in an arc shape to achieve a gradual change in stiffness, eliminate stress concentration points, and make the force and vibration more smoothly transmitted and discharged outward.

[0147] Therefore, the first reinforcing rib 150 in this embodiment includes two arc-shaped first extensions 151 and a second extension 152 with an inner arc shape, forming a U-shaped structure. The overall structure presents a curved extension, which helps to reduce stress concentration under forming and load, so that stress can be more smoothly discharged outward, which helps to improve fatigue life.

[0148] The second extension 152 is connected to the mounting platform 170 to bear the load of the fan 11 on the mounting platform 170 and transmit the load to the two second extensions 152 respectively, ensuring that the dynamic load is quickly and smoothly distributed to the entire base plate 100, avoiding local stress concentration, thereby greatly reducing vibration and noise, and significantly improving the durability and reliability of the base plate 100.

[0149] In some embodiments, to prevent excessive thinning of the sheet metal, resulting in a thinning rate greater than or equal to 18%, the width D6 of the first extension 151 is greater than 30 mm. For example, the width D6 of the first extension 151 is 30 mm to 40 mm. The distance D7 between the inner side of the second extension 152 and the mounting platform 170 can be 20 mm to 30 mm.

[0150] Continue to refer to Figure 8 In some embodiments of this application, the outer side of the end where the two first extensions 151 are connected to the edge portion 120 protrudes outward to form a first protrusion 153, so that the angle between the outer side of the first extension 151 and the edge portion 120 is not an acute angle.

[0151] The two first extensions 151 have their opposite sides as the outer sides, and the end of the outer side that connects to the second protruding edge 122 protrudes outward to form the first protruding part 153. This increases the connection area between the first extension 151 and the surrounding edge 120, which is beneficial for stress to be discharged outward; it also ensures that the angle between the outer side of the first extension 151 and the surrounding edge 120 is not an acute angle, reducing the probability of stress concentration; moreover, it facilitates molding and demolding.

[0152] Continue to refer to Figure 8 The first reinforcing rib 150 further includes a third extension 154, which extends circumferentially along the mounting platform 170 and connects to the second extensions 152 of two adjacent first reinforcing ribs 150.

[0153] The third extension 154 is disposed near the mounting platform 170 and connects to the second extensions 152 of two adjacent first reinforcing ribs 150 that are close to each other. The third extension 154 is provided so that the multiple first reinforcing ribs 150 form a closed ring around one end of the mounting platform 170, and the closed ring surrounds the outside of the mounting platform 170.

[0154] This configuration allows the force exerted by the fan 11 on the mounting platform 170 to be evenly transmitted from the third extension 154 and the second extension 152 toward the first extension 151, which facilitates stress outward dissipation and reduces the possibility of stress concentration.

[0155] The first reinforcing rib 150 may also include a fourth extension 155, which is connected to one end of the two first extensions 151 that is away from the second extension 152, and the fourth extension 155 extends along the edge of the perimeter portion 120.

[0156] The first extension 151 is away from the outer end of the mounting platform 170 and is indirectly connected to the edge portion 120 via the fourth extension 155. The fourth extension 155 extends the second protruding edge 122 of the edge portion 120 to increase the connection area between the first reinforcing rib 150 and the edge portion 120, which is beneficial for better stress transmission.

[0157] Continue to refer to Figure 8 The second reinforcing rib 160 includes two first rib portions 161, which are arc-shaped and protrude towards each other from their inner sides; the two first rib portions 161 are spaced apart, and the outer ends of the two first rib portions 161 extend to the perimeter portion 120. The outer ends of the two first rib portions 161 away from the mounting platform portion 170 extend to the straight edge portion 1224 of the second protruding edge portion 122.

[0158] The second reinforcing rib 160 also includes a second rib portion 162, the inner side of which is arc-shaped and protrudes toward the mounting platform portion 170; both ends of the second rib portion 162 are respectively connected to two first rib portions 161. The arc shape on the inner side of the second rib portion 162 is tangentially connected to the arc shape on the inner side of the first rib portion 161.

[0159] The outer wall of the second reinforcing rib 160 is connected to the outer edge of the first reinforcing rib 150. In this embodiment, the draft angle of the deep drawing can be 30° to 40°, so that the edges of each part have a gradual inclination, which facilitates demolding and avoids stress concentration.

[0160] The second reinforcing rib 160 in this embodiment includes two first rib portions 161 and one second rib portion 162, both of which have arc-shaped inner sides, so that the second reinforcing rib 160 extends in a curved manner, which helps to increase the structural strength and rigidity of the base plate 100 and avoid stress concentration.

[0161] The interval between the two first ribs 161 increases from the center outward, making the second reinforcing rib 160 have an outward-opening trumpet shape. This helps to guide the load of the fan 11 on the central mounting platform 170 outward, thereby dispersing the load and avoiding fatigue caused by load concentration.

[0162] Continue to refer to Figure 8 In some embodiments, the protruding portion 140 also forms a third reinforcing rib 180, which is located inside the second reinforcing rib 160; and the third reinforcing rib 180 is connected to the surrounding edge portion 120. The third reinforcing rib 180 is connected to the second protruding edge portion 122 of the surrounding edge portion 120.

[0163] By providing a third reinforcing rib 180 inside the second reinforcing rib 160, the structural strength and stiffness of this area are increased.

[0164] The following is a schematic illustration of some dimensions of the first reinforcing rib 150 and the second reinforcing rib 160.

[0165] Combination Figure 9 In the projection of the base plate 100 onto the first plane, a straight line parallel to the first horizontal direction and located at the center of the base plate 100 in the second horizontal direction is defined as the first center line O1, and a straight line parallel to the second horizontal direction and located at the center of the base plate 100 in the first horizontal direction is defined as the second center line O2; wherein, the first horizontal direction and the second horizontal direction are perpendicular and both are parallel to the first plane. The intersection of the first center line O1 and the second center line O2 is the geometric center O of the base plate 100.

[0166] exist Figure 9 In this context, the first horizontal direction corresponds to the X-axis direction, the second horizontal direction corresponds to the Y-axis direction, and the first plane corresponds to the XY plane.

[0167] The straight line passing through the arc center of the second extension 152 and the midpoint of the second extension 152 is defined as the second rib centerline L1.

[0168] The angle between the centerline of the second rib and the centerline of the second rib is 40° to 50°.

[0169] When four first reinforcing ribs 150 are provided, the angles between the centerline L1 of each second rib and the second centerline are A1, A2, A3 and A4, respectively.

[0170] In some embodiments, the angle between each second rib centerline L1 and the second centerline can be different, i.e., A1, A2, A3 and A4 can be different, so that the first reinforcing ribs 150 are distributed in a non-stacked manner, which is related to the asymmetrical arrangement of the components on the base plate 100, and makes the arrangement position of the first reinforcing ribs 150 flexible.

[0171] Among them, A1, A2, A3 and A4 can be determined according to the maximum allowable position of the component, stress limit and other requirements.

[0172] In this embodiment of the application, by limiting the relative position of the first reinforcing rib 150 and the second center line, the arrangement position of the first reinforcing rib 150 is flexible and can be easily adjusted according to the actual situation.

[0173] Combination Figure 9 The outer dimensions of the base plate 100 can be 840mm×840mm, and the C-corner dimension is 224mm. This is only a schematic description of the dimensions of the base plate 100.

[0174] It should also be noted that, in Figure 9 In the diagram, the dimensions of the first reinforcing rib 150 are schematically illustrated with reference to the center line position of the first reinforcing rib 150.

[0175] exist Figure 9 In this diagram, DIA1 represents the diameter of the tangent circle at the end of the first reinforcing rib 150 near the mounting platform 170, and DIA4 represents the diameter of the tangent circle at the extension position of the outer end of the first extension portion 151 of the first reinforcing rib 150. The value of DIA1 ranges from 190mm to 220mm, and the value of DIA4 ranges from 740mm to 780mm.

[0176] Multiple first reinforcing ribs 150 can be tangent to the same diameter DIA1 at one end near the mounting platform 170, or they can be individually tangent to different diameter DIA1 according to design requirements. This invention preferentially uses different values ​​of DIA1 and unequal values ​​of A1, A2, A3, and A4.

[0177] Continue to refer to Figure 2 The straight line passing through the arc center of the second rib 162 and the midpoint of the second rib 162 is defined as the centerline of the first rib.

[0178] The centerline of the first rib of the second reinforcing rib 160 is parallel to the first centerline and is spaced apart from the first centerline.

[0179] In addition, the centerline of the first rib of the second reinforcing rib 160 is parallel to the second centerline and is spaced apart from the second centerline.

[0180] This design increases the flexibility of the second reinforcing rib 160's placement, allowing the position of the second reinforcing rib 160 to be adjusted according to the asymmetrical structure of the air conditioner's indoor unit, which is beneficial for stress dissipation.

[0181] For example, four second reinforcing ribs 160 are provided, and the intervals between the four second reinforcing ribs 160 and the first center line or the second center line are D1, D2, D3 and D4, respectively. The values ​​of D1, D2, D3 and D4 are within ±20mm relative to the center line. For example, D1 can be located within 20mm to the right and 20mm to the left of the first center line.

[0182] DIA2 represents the diameter of the tangent circle of the second reinforcing rib 160 near the top of the mounting platform 170, and DIA3 represents the diameter of the tangent circle at the extension position of the outer end of the first rib portion 161 of the second reinforcing rib 160. The value of DIA2 ranges from 300 to 340 mm, and the value of DIA3 ranges from 610 mm to 630 mm.

[0183] Combination Figure 10 The black dotted line indicates the centerline of the width of the first reinforcing rib 150. The outer red line represents the outer edge, and the inner blue line represents the inner edge. The radius R1 of the first extension 151 is 500mm to 600mm. The radius R2 of the second extension 152 is 50mm to 70mm. The R1 value is the same for all four first reinforcing ribs 150; the R2 value can be different for each rib as needed. The opening angle A5 is 16° to 24°. The width W1 of the first reinforcing rib 150 is 30mm to 40mm.

[0184] Combination Figure 11 The black lines indicate the position where the centerline of the first rib coincides with the centerline of the second rib. The red and blue lines indicate the positions where the centerline of the first rib deviates from the centerline of the second rib, respectively. The radius R4 of the first rib 161 is 360mm to 500mm, and the R4 value is the same for all second reinforcing ribs 160. The radius R3 of the second rib 162 is 10mm to 20mm, and the R3 value can be different for each second reinforcing rib 160 as needed. The opening width D5 of the second reinforcing rib 160 is 150mm to 180mm. The opening width of the second reinforcing rib 160 is the distance between the outer ends of the second reinforcing rib 160. The width of the second reinforcing rib 160 is 30mm to 40mm.

[0185] Combination Figure 12 The displacement cloud diagram shown in the figure indicates that the maximum displacement of the base plate 100 in this embodiment is 0.43 mm.

[0186] Combination Figure 13 The stress distribution cloud diagram shown in the figure indicates that the stress distribution amplitude of the base plate 100 in this embodiment of the application is between 0 and 40 MPa.

[0187] The base plate 100 structure of this application embodiment can be compatible with deep drawing of DC51 material with a thickness of 0.6~0.8mm, solving the problems of tearing defects and strength reduction in thin plate materials during forming.

[0188] In some experimental analyses, when the base plate 100 of this application embodiment is formed using DC51 material, compared with the base plate in the related art, the displacement of the base plate 100 of this application embodiment is reduced by 56%, the average stress value is reduced by 22.4% (maximum stress value 45.8 MPa), and the structural safety factor is 3.4 (yield strength 156 MPa).

[0189] When a lightweight, high-strength material is used to form the base plate, the material thickness t=0.65mm. Compared with the base plate in the related art, the displacement of the base plate 100 in this embodiment is reduced by 45.5% (the maximum displacement in the related art is 1.21mm, while the maximum displacement in this application is 0.66mm), the average stress value is reduced by 13% (the maximum stress value is 73.3MPa), and the structural safety factor is 4.5 (yield strength 330MPa).

[0190] Compared with the base plate design of t=0.65mm in the embodiment of this application, the displacement of the base plate in the embodiment of this application is still reduced by 29.7% when the material thickness t=0.8mm is used in related technologies.

[0191] Referring to the table below, a comparison of the frequencies of the base plate in the related art and the base plate 100 in the embodiment of this application is presented.

[0192] As can be seen from the table, in the embodiment of this application, the base plate 100, whether formed with a material thickness of 0.8mm or 0.65mm, has higher frequencies and improved stiffness at each order.

[0193]

[0194] Combination Figure 14 The deep drawing simulation diagram shown indicates that when the base plate 100 is formed by pressing according to the embodiment of this application, there is no tearing and all are within the safe range.

[0195] exist Figure 14 The left side of the image shows the Forming Limit Diagram (FLC), a core tool for material formability analysis. Its horizontal axis (usually principal strain or secondary strain) and vertical axis (usually secondary strain or thickness strain) represent the strain values ​​of the material in different directions. The curve in the diagram is called the Forming Limit Curve (FLC), used to delineate the safe zone, wrinkling risk zone, and fracture risk zone of the material. The area above the curve indicates that the material may fracture. The area near the curve indicates a risk of fracture. The area below the curve indicates that wrinkling may occur and needs to be evaluated in conjunction with other parameters (such as blank holder force). To the left of the curve: Insufficient stretching may occur.

[0196] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0197] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An indoor unit for an air conditioner, characterized in that, include: Fans provide the power for indoor air circulation; A base plate, on the bottom surface of which the fan is mounted, the base plate comprising: The base edge is ring-shaped; A surrounding edge portion is connected to the inner side of the base edge portion, and the surrounding edge portion protrudes in a first direction relative to the base edge portion; A plurality of first reinforcing ribs and a plurality of second reinforcing ribs are provided. A portion of the perimeter portion is recessed relative to the base edge portion in a second direction, forming a recessed surface and a convex surface. The plurality of first reinforcing ribs are formed in the recessed surface portion, and the plurality of second reinforcing ribs are formed in the convex surface portion. The plurality of first reinforcing ribs and the plurality of second reinforcing ribs are arranged alternately along the periphery of the perimeter portion. The first direction and the second direction are opposite and both are perpendicular to the thickness direction of the base edge portion. The mounting platform is located at the center of the surrounding portion; the mounting platform is fixedly connected to the fan; the mounting platform protrudes in the first direction relative to the recessed surface. The recessed surface includes an outer curved surface and an inner flat surface. The outer curved surface surrounds the outer side of the inner flat surface, and the recessed depth of the outer curved surface is smaller at the inner end than at the outer end. The side edges of the first reinforcing rib and the second reinforcing rib extend along a curve; the first reinforcing rib includes: Two first extensions are arc-shaped and protrude away from each other; there is a gap between the two first extensions, and the outer ends of the two first extensions extend toward the surrounding edge; the gap between the two first extensions increases from the mounting platform to the surrounding edge. The second extension has two ends connected to the inner ends of the two first extensions respectively. The side of the second extension facing the mounting platform is connected to the mounting platform. The second extension is arc-shaped away from the inner side of the mounting platform and protrudes towards the mounting platform.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The outer side of the two first extensions that are connected to the edge portion protrudes outward to form a first protrusion, so that the angle between the outer side of the first extension and the edge portion is not an acute angle.

3. The indoor unit of the air conditioner according to claim 1, characterized in that, The first reinforcing rib also includes: The third extension extends circumferentially along the mounting platform and connects the second extensions of two adjacent first reinforcing ribs. A fourth extension is connected to one end of the two first extensions that is away from the second extension, and the fourth extension extends along the edge of the surrounding portion.

4. The indoor unit of the air conditioner according to claim 1, characterized in that, The surrounding edge includes multiple straight edges, which are connected end to end in sequence. Each of the straight edges is connected to one end of one of the second reinforcing ribs that is away from the mounting platform. One first reinforcing rib is provided between each two adjacent straight edges.

5. The indoor unit of the air conditioner according to claim 1, characterized in that, The second reinforcing rib includes: Two first ribs, the two first ribs being arc-shaped toward each other's inner side and protruding toward each other; the two first ribs being spaced apart, and the outer ends of the two first ribs extending to the surrounding edge; The second rib has an arc-shaped inner side that protrudes toward the mounting platform; both ends of the second rib are connected to the two first ribs respectively.

6. The indoor unit of the air conditioner according to claim 5, characterized in that, In the projection of the base plate onto the first plane, a straight line parallel to the first horizontal direction and located at the center of the base plate in the second horizontal direction is defined as the first center line, and a straight line parallel to the second horizontal direction and located at the center of the base plate in the first horizontal direction is defined as the second center line; wherein, the first horizontal direction and the second horizontal direction are perpendicular and both are parallel to the first plane; Define the straight line passing through the center of the arc of the second rib and the midpoint of the second rib as the centerline of the first rib; The centerline of the first rib of a portion of the second reinforcing rib is parallel to the first centerline and is spaced apart from the first centerline. In another portion, the centerline of the first rib of the second reinforcing rib is parallel to the second centerline and is spaced apart from the second centerline.

7. The indoor unit of the air conditioner according to claim 5, characterized in that, The protruding surface also forms a third reinforcing rib, which is located inside the second reinforcing rib; and the third reinforcing rib is connected to the surrounding edge.

8. The air conditioner indoor unit according to any one of claims 1-7, characterized in that, In the projection of the base plate onto the first plane, a straight line parallel to the first horizontal direction and located at the center of the base plate in the second horizontal direction is defined as the first center line, and a straight line parallel to the second horizontal direction and located at the center of the base plate in the first horizontal direction is defined as the second center line; wherein, the first horizontal direction and the second horizontal direction are perpendicular and both are parallel to the first plane; The straight line passing through the center of the arc of the second extension and the midpoint of the second extension is defined as the centerline of the second rib. The angle between the centerline of the second rib and the centerline of the second rib is 40° to 50°.

9. The indoor unit of the air conditioner according to any one of claims 1-7, characterized in that, The mounting platform includes: The platform body is circular; the platform body protrudes in the first direction relative to the recessed surface. The second protrusion protrudes in the first direction relative to the platform body portion; Multiple fixing parts are arranged at intervals along the circumference of the platform body; the fixing parts protrude relative to the platform body towards the second direction; the fixing parts are fixedly connected to the fan.

10. The indoor unit of the air conditioner according to any one of claims 1-7, characterized in that, The surrounding edge includes: A first protruding edge protrudes in the first direction relative to the base edge, and the first protruding edge is connected to the inner side of the base edge. A second protruding edge protrudes in the first direction relative to the first protruding edge, and the second protruding edge is connected to the inner side of the first protruding edge; the second protruding edge includes: The edge body is annular and connected to the inner side of the first protruding edge. A plurality of first protruding ribs are connected to the side body and extend toward the first protruding side portion; the plurality of first protruding ribs are arranged at intervals along the side body; the plurality of first protruding ribs are spaced apart from the base side portion; A plurality of second protruding ribs are connected to the side body and extend toward the first protruding side to connect with the base side, and the plurality of first protruding ribs are arranged at intervals along the side body.

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