CN105927628B

CN105927628B - Indoor unit of air conditioner

Info

Publication number: CN105927628B
Application number: CN201610522915.8A
Authority: CN
Inventors: 朱江程; 杨亮; 张正甫; 林国游; 邓晶; 黄华东
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2016-07-04
Filing date: 2016-07-04
Publication date: 2020-02-14
Anticipated expiration: 2036-07-04
Also published as: CN105927628A

Abstract

The invention discloses an indoor unit of an air conditioner. The indoor unit of the air conditioner comprises an indoor unit shell, wherein the indoor unit shell comprises a shell, a return air cover plate and a clamping structure. At least one side of the return air cover plate is connected with the casing through a clamping structure, the clamping structure comprises a clamping groove structure and a buckle structure matched with the clamping groove structure, one of the clamping groove structure and the buckle structure is arranged on the plate body of the return air cover plate, and the other of the clamping groove structure and the buckle structure is arranged on the plate body of the casing. At least one side of the return air cover plate is connected with the casing through a clamping structure, and compared with the return air cover plate in the prior art which is fixedly installed only by screws, the installation process is simple and convenient, and the efficiency of assembling the indoor unit casing of the indoor unit of the air conditioner is improved.

Description

Indoor unit of air conditioner

Technical Field

The invention relates to the technical field of electric appliances, in particular to an indoor unit of an air conditioner.

Background

The indoor unit shell of the indoor unit of the air conditioner usually adopts sheet metal parts. The sheet metal part cannot be integrally formed like an injection molding part due to factors such as mold processing capacity, and therefore the shell of the indoor unit needs to be formed by splicing a plurality of parts. In the prior art, the sheet metal parts are usually fixed and installed by screws. Therefore, the installation of the indoor machine shell of the air conditioner indoor machine needs too many screws to be installed, and the efficiency is low. The prior art indoor unit of the air conditioner has a low assembly efficiency of the indoor unit casing.

In addition, the air return mode of the air conditioner indoor unit can be switched by replacing the position of the air return cover plate, but when the position of the air return cover plate needs to be replaced after sale, the screws are easily missed after sale due to the excessive number of the screws, and the missed screws can cause abnormal operation sound of the air conditioner indoor unit and influence the performance of the air conditioner.

Disclosure of Invention

The invention aims to provide an air-conditioning indoor unit, which aims to improve the assembly efficiency of an indoor unit shell of the air-conditioning indoor unit.

The invention provides an air-conditioning indoor unit which comprises an indoor unit shell, wherein the indoor unit shell comprises a machine shell, a return air cover plate and a clamping structure, at least one side edge of the return air cover plate is connected with the machine shell through the clamping structure, the clamping structure comprises a clamping groove structure and a clamping structure matched with the clamping groove structure, one of the clamping groove structure and the clamping structure is arranged on a plate body of the return air cover plate, and the other of the clamping groove structure and the clamping structure is arranged on the plate body of the machine shell.

Further, the clamping groove structure comprises a clamping groove, the clamping structure comprises a clamp buckle matched with the clamping groove in a clamping mode, the clamping groove structure further comprises a clamping groove folding edge, the clamping groove folding edge is a folding edge arranged at the edge of the plate body where the clamping groove structure 41 is located, and the clamping groove is formed in the clamping groove folding edge; and/or, the buckle structure still includes the buckle hem, and the buckle hem is for setting up in the hem of the edge of the plate body at buckle structure place, and the first end of buckle is connected in the buckle hem, and the second end of buckle extends to the draw-in groove in to one side of draw-in groove structure.

Furthermore, the folded edge of the clamping groove is bent towards the inner side of the indoor unit shell; and/or the buckle folding edge is bent towards the inner side of the indoor unit shell.

Furthermore, the first end of the buckle is abutted against the edge of the clamping groove of the plate body, close to the clamping groove structure, of the clamping groove.

Furthermore, the clamping groove folding edge and the buckle folding edge are abutted to limit the position of the return air cover plate relative to the machine shell.

Further, the buckle structure comprises at least two buckles, and the clamping groove structure comprises at least two clamping grooves which are arranged in one-to-one correspondence with the at least two buckles.

Further, the distance between the second end of the buckle and the inner side surface of the plate body where the buckle structure is located is smaller than the distance between the first end of the buckle and the inner side surface of the plate body where the buckle structure is located.

Further, the buckle hem includes the plain edge, and the buckle is including setting up in the dull edge on the dull edge flat board, the contained angle between plain edge and the flat board that sets up on it is the acute angle.

Further, the buckle hem is perpendicular to the plate body that buckle structure was located.

Further, the draw-in groove hem includes interconnect's first draw-in groove hem and second draw-in groove hem, and first draw-in groove hem is for connecting in the edge of the plate body at draw-in groove structure place and for the hem that this plate body buckles, and second draw-in groove hem is for connecting in first draw-in groove hem and from the hem that first draw-in groove hem was buckled towards buckle structure.

Furthermore, one end of the buckle folding edge, which is far away from the plate body where the buckle structure is located, is abutted against the side face, which is close to the plate body where the clamping groove structure is located, of the second clamping groove folding edge.

Further, the side face of the buckle folding edge is attached to the side face of the first clamping groove folding edge.

Further, the folded edge of the first clamping groove is perpendicular to the plate body where the clamping groove structure is located; and/or the folded edge of the second clamping groove is perpendicular to the folded edge of the first clamping groove.

Furthermore, the clamping groove structure is arranged on the plate body of the casing, and the buckle structure is arranged on the plate body of the return air cover plate.

Furthermore, the clamping groove structures are arranged on the plate body of the casing, the buckle structures are arranged on the plate body of the return air cover plate, the indoor unit casing comprises more than two clamping groove structures arranged on different plate bodies of the casing, and the buckle structures can be selectively matched with one of the more than two clamping groove structures so as to enable the return air cover plate to be connected to different positions of the casing; or the clamping groove structure is arranged on the plate body of the return air cover plate, the buckle structures are arranged on the plate body of the casing, the indoor unit casing comprises more than two buckle structures arranged on different plate bodies of the casing, and the clamping groove structure is selectively matched with one of the more than two buckle structures to enable the return air cover plate to be connected to different positions of the casing.

Furthermore, the indoor unit shell further comprises a fixing piece, the first side of the air return cover plate is connected with the casing through a clamping structure, and the second side of the air return cover plate is connected with the casing through the fixing piece.

Furthermore, the two ends of the second side of the air return cover plate are connected with the machine shell through fixing pieces.

Furthermore, the clamping groove structure and the plate body where the clamping groove structure is located are integrally formed sheet metal parts; and/or the buckle structure and the plate body where the buckle structure is arranged are integrally formed sheet metal parts.

Further, the air-conditioning indoor unit is an air pipe type air-conditioning indoor unit.

Based on the technical scheme provided by the invention, the indoor unit of the air conditioner comprises an indoor unit shell, wherein the indoor unit shell comprises a shell, a return air cover plate and a clamping structure. At least one side edge of the return air cover plate is connected with the machine shell through a clamping structure. The clamping structure comprises a clamping groove structure and a clamping buckle structure matched with the clamping groove structure. One of the clamping groove structure and the buckle structure is arranged on the plate body of the return air cover plate, and the other of the clamping groove structure and the buckle structure is arranged on the plate body of the machine shell. At least one side of the return air cover plate is connected with the casing through a clamping structure, and compared with the return air cover plate in the prior art which is fixedly installed only by screws, the installation process is simple and convenient, and the efficiency of assembling the indoor unit casing of the indoor unit of the air conditioner is improved.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic structural view of a return air cover plate of an indoor unit casing of an indoor unit of an air conditioner according to an embodiment of the present invention, the return air cover plate being disposed at a first position of the casing;

fig. 2 is a schematic structural view of a return air cover plate of an indoor unit casing of an indoor unit of an air conditioner according to an embodiment of the present invention, the return air cover plate being disposed at a second position of the casing;

FIG. 3 is a schematic structural view of a return air cover plate and a fastening structure according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of the M portion (where the buckle is located) of the buckle structure shown in FIG. 3;

FIG. 5 is a schematic view of an included angle between a buckle and a buckle folding edge of the buckle structure shown in FIG. 3;

FIG. 6 is a schematic structural diagram of a housing and a card slot structure according to an embodiment of the invention;

FIG. 7 is an enlarged schematic view of the N portion (where the card slot is located) of the card slot structure shown in FIG. 6;

FIG. 8 is a schematic view of a structure in which a snap structure is engaged with a slot structure;

fig. 9 is an enlarged schematic view of the engagement between the locking structure and the locking groove structure in fig. 8.

Each reference numeral represents:

1-a machine shell; 2-air return cover plate; 3-a fixing piece; 4-a clamping structure; 41-a card slot structure; 411-folding the first clamping groove; 412-folding the second clamping groove; 413-card slot; 42-a snap-fit structure; 421-folding a buckle; 422-snap fastener.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The air conditioner indoor unit comprises an indoor unit shell, wherein the indoor unit shell comprises a shell, a return air cover plate and a clamping structure. At least one side edge of the return air cover plate is connected with the machine shell through a clamping structure. The clamping structure comprises a clamping groove structure and a clamping buckle structure matched with the clamping groove structure. In this embodiment, buckle structure locates on the plate body of return air apron, and the draw-in groove structure is located on the plate body of casing. In an embodiment not shown in the drawings, the locking groove structure may be disposed on the plate body of the return air cover plate, and the locking structure is disposed on the plate body of the casing.

At least one side of the return air cover plate is connected with the casing through a clamping structure, and compared with the return air cover plate in the prior art which is fixedly installed only by screws, the installation process is simple and convenient, and the efficiency of assembling the indoor unit casing of the indoor unit of the air conditioner is improved.

As shown in fig. 1 to 9, the indoor unit casing of the present embodiment includes a casing 1, a return air cover 2, and a latch structure 4. One side of the return air cover plate 2 is connected with the machine shell 1 through a clamping structure 4. The latch structure 4 includes a latch structure 41 and a catch structure 42 cooperating with the latch structure 41. The buckling structure 42 is arranged on the plate body of the return air cover plate 2. The slot structure 41 is disposed on the board body of the housing 1.

One side of the air return cover plate 2 is connected with the machine shell 1 through the clamping structure 4, the installation process is simple and convenient, and the assembly efficiency of the indoor unit shell of the indoor unit of the air-conditioning indoor unit is improved.

In order to make the position of the return air cover plate 2 relative to the casing 1 more accurate and less prone to loosening, as shown in fig. 1 and 2, the indoor unit casing of the present embodiment further includes a fixing member 3. The first side of return air apron 2 is connected with casing 1 through joint structure 4, and the second side of return air apron 2 passes through mounting 3 and is connected with casing 1.

Specifically, the fixing member 3 is a screw. The first side of the return air cover plate 2 is connected with the machine shell 1 through a clamping structure 4, and the second side of the return air cover plate 2 is connected with the machine shell 1 through a screw. When the air return mode of the indoor unit of the air conditioner needs to be switched, the clamping structure 4 is arranged, so that the switching assembly process is simple and efficient. In addition, the second side of the air return cover plate 2 is connected with the machine shell 1 through screws, so that the position of the air return cover plate 2 on the machine shell 1 is more accurate and more stable in connection.

Therefore, the indoor unit casing of the indoor unit of the air conditioner is matched with the fixing piece 3 and the clamping structure 4, so that the assembling efficiency of the indoor unit casing is improved, and the return air cover plate 2 is not easy to loosen relative to the casing 1.

Preferably, both ends of the second side of the return air cover plate 2 are connected with the casing 1 through fixing members 3. The both ends of the second side of return air apron 2 are connected through mounting 3 and casing 1 and can make return air apron 2 install on the basis of casing 1 more firmly, and it is more convenient to assemble.

Preferably, the second side of the return air cover plate 2 is provided with an assembly flange for better connection between the second side of the return air cover plate 2 and the casing 1. The fixing piece 3 is used for connecting the assembly folding edge and the machine shell 1.

Preferably, the casing of the indoor unit includes more than two slot structures disposed on different plate bodies of the casing 1. The snap features 42 selectively engage one of more than two slot features to allow the return air cover panel 2 to be attached to the chassis 1 at different locations.

Specifically, in this embodiment, as shown in fig. 6, the casing of the indoor unit includes two slot structures disposed on two different plate bodies of the casing 1. The two slot structures are respectively a slot structure 41 disposed on the lower plate (the plate located above in fig. 1) and a slot structure 41 disposed on the rear plate (the plate located on the front side in fig. 2). The snap features 42 selectively engage one of the two slot features to allow the return air cover panel 2 to be attached to the chassis 1 at different locations.

As shown in fig. 1, when the locking structure 42 is engaged with the locking groove structure 41 disposed on the lower plate, the return air cover plate 2 is disposed at the first position of the casing 1. At the moment, the air return cover plate 2 is positioned at the lower part of the shell 1, and the air return mode of the indoor unit of the air conditioner is back air return. As shown in fig. 2, when the locking structure 42 is engaged with the locking groove structure 41 disposed on the rear plate, the air return cover plate 2 is disposed at the second position of the casing 1. At the moment, the air return cover plate 2 is positioned at the rear part of the shell 1, and the air return mode of the indoor unit of the air conditioner is downward air return.

In this embodiment, since the rear plate body has a small area (the front bottom plate body in fig. 1 and 2), the rear plate body is integrally press-formed with the upper plate body.

In an embodiment not shown in the drawings, the locking groove structure may be disposed on the plate body of the return air cover plate, and the locking structure is disposed on the plate body of the casing. The indoor unit shell comprises more than two buckle structures arranged on different plate bodies of the casing. The clamping groove structure can be selectively matched with one of the more than two clamping structures so that the return air cover plate can be connected to different positions of the machine shell.

The detailed structure of the snap structure and the slot structure and the matching relationship between the two will be described in detail below with reference to fig. 3 to 9.

In this embodiment, the slot structure 41 is disposed on the casing 1, and the fastening structure 42 is disposed on the air return cover plate 2.

The pocket structure 41 includes a pocket flange and a pocket 413. The slot hem is the hem that sets up in the edge of the casing 1 plate body, and draw-in groove 413 is seted up on the slot hem.

The snap structure 42 further includes a snap 422 and a snap flange 421 snap-fitted to the snap groove 413. Buckle hem 421 is the hem that sets up in the edge of the plate body of return air apron 2, and buckle 422's first end is connected on buckle hem 421, and buckle 422's second end extends to in the draw-in groove 413 to draw-in groove structure 41 one side. The second end of the clip 422 extends into the clip groove 413 toward one side of the clip groove structure 41, so that the clip 422 is blocked by the clip folding edge 41, thereby connecting the return air cover plate 2 to the casing 1.

The folded edge of the clamping groove is bent towards the inner side of the indoor unit shell. The buckle folding edge is also bent towards the inner side of the indoor unit shell. This arrangement makes the fitting between the snap structure 42 and the catch structure 41 completed inside the indoor unit casing, thereby making the entire structure of the indoor unit casing compact. Moreover, the clamping fit between the clamping structure 42 and the clamping groove structure 41 is not interfered by the outside, and the fit is more reliable.

A first end of the fastener 422 abuts against a slot edge of the slot 413 close to the plate body of the housing 1. The first end of the buckle 422 abuts against the edge of the clamping groove 413 close to the plate body of the housing 1, and the position of the buckle 422 relative to the clamping groove 413 is limited by the abutment between the buckle folding edge 421 and the clamping groove 413, so that the reliability of the clamping structure 4 is improved.

Preferably, the slot edge abuts against the snap edge 421 to limit the position of the return air cover plate 2 relative to the casing 1. Draw-in groove hem and buckle hem 421 butt constitute spacingly to the cooperation between buckle 422 and the draw-in groove 413, further improve joint structure 4's reliability.

To better attach the return air cover 2 to the cabinet 1, the latch structure 42 includes at least two latches 422. At least two catches 422 are spaced apart on the catch flap 421. The slot structure 42 includes at least two slots 413 corresponding to the at least two fasteners 422.

Preferably, the at least two snaps 422 are evenly distributed on the snap flaps 421. Correspondingly, the at least two slots 413 are also uniformly distributed on the slot folding edge.

Preferably, the distance between the second end of the clip 422 and the inner side surface of the plate body of the return air cover plate 2 is smaller than the distance between the first end of the clip 422 and the inner side surface of the plate body of the return air cover plate 2.

Specifically, as shown in fig. 5, the snap flaps 421 are flat edges, and the snap 422 is a flat plate. The included angle a between the snap folding edge 421 and the snap 422 is an acute angle.

Preferably, the included angle a is 20 ° to 80 °. Within this angle range, the engagement between the locking structure 42 and the locking structure 41 is tight, and the assembly is convenient.

Preferably, the snap folding edge 421 is a flat edge, and the snap folding edge 421 is perpendicular to the plate body of the return air cover plate 2.

In this embodiment in particular, as shown in fig. 7 and 9, the pocket flange includes a first pocket flange 411 and a second pocket flange 412 that are connected to each other. The first slot flange 411 is a flange (specifically, a flat edge) connected to an edge of the plate of the housing case 1 and bent with respect to the plate of the housing case 1, and the second slot flange 412 is a flange (specifically, a flat edge) connected to the first slot flange 411 and bent from the first slot flange 411 toward the buckle structure 42. And one end (bottom end in fig. 9) of the buckle folding edge 421, which is far away from the plate body of the return air cover plate 1, abuts against the side (upper side in fig. 9) of the second slot folding edge 412, which is close to the plate body where the slot structure 41 is located.

The bottom end of the buckle folding edge 421 abuts against the upper side face of the second clamping groove folding edge 412 to limit the matching between the buckle 422 and the clamping groove 413, and the connection reliability of the clamping structure 4 is further improved.

Preferably, the side of the snap flap 421 fits the side of the first slot flap 411. The side of buckle hem 421 and the side of first draw-in groove hem 411 laminate mutually and constitute further spacing to the cooperation between buckle 422 and the draw-in groove 413, effectively prevent buckle 422 for the removal of draw-in groove 413 for return air apron 2 is more accurate for the position of casing 1, is difficult for rocking.

In this embodiment, the first slot flange 411 is perpendicular to the plate body of the housing 1. The first slot flap 411 is perpendicular to the second slot flap 412. The second slot flange 412 is vertically arranged at the lower end of the first slot flange 411, so that the upper side surface of the second slot flange 412 is abutted to the bottom end of the buckle flange 421, and meanwhile, the side surface of the buckle flange 421 is attached to the side surface of the first slot flange 411, so that the reliability of connection of the clamping structure is improved.

In this embodiment, the slot structure 41 and the plate body thereof may be an integrally formed sheet metal part. The snap structure 42 and the plate body thereof are integrally formed sheet metal parts.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. The utility model provides an indoor unit of an air conditioner, indoor unit of an air conditioner includes indoor unit casing, indoor unit casing includes casing (1) and return air apron (2), its characterized in that, indoor unit casing still includes joint structure (4), at least one side of return air apron (2) passes through joint structure (4) with casing (1) is connected, joint structure (4) including draw-in groove structure (41) and with draw-in groove structure (41) complex buckle structure (42), draw-in groove structure (41) with one of buckle structure (42) is located on the plate body of return air apron (2), on the plate body of casing (1) is located to another in draw-in groove structure (41) and the buckle structure (42), draw-in groove structure (41) includes draw-in groove (413), buckle structure (42) include with draw-in groove (413) joint complex buckle (422), the clamping groove structure (41) further comprises a clamping groove folding edge, the clamping groove folding edge is a folding edge arranged at the edge of the plate body where the clamping groove structure (41) is located, the clamping groove (413) is arranged on the clamping groove folding edge, the buckle structure (42) further comprises a buckle folding edge (421), the buckle folding edge (421) is a folding edge arranged at the edge of the plate body where the buckle structure (42) is located, a first end of a buckle (422) is connected to the buckle folding edge (421), a second end of the buckle extends to one side of the clamping groove structure (41) into the clamping groove (413), the clamping groove folding edge comprises a first clamping groove folding edge (411) and a second clamping groove folding edge (412) which are connected with each other, the first clamping groove folding edge (411) is a folding edge connected to the edge of the plate body where the clamping groove structure (41) is located, and the second clamping groove folding edge (412) is connected to the first folding groove folding edge (411) and is located from the first clamping groove folding edge And the end, far away from the plate body where the buckle structure (42) is located, of the buckle folding edge (421) is abutted against the side face, close to the plate body where the clamping groove structure (41), of the second clamping groove folding edge (412).

2. The indoor unit of an air conditioner according to claim 1, wherein the notch folded edge is folded toward the inside of the indoor unit casing; and/or the buckle folding edge (421) is bent towards the inner side of the indoor unit shell.

3. The indoor unit of air conditioner as claimed in claim 1, wherein the first end of the buckle (422) abuts against the edge of the slot (413) of the board body near the slot structure (41).

4. The indoor unit of air conditioner as claimed in claim 1, wherein the slot flange abuts against the snap flange (421) to limit the position of the return air cover plate (2) relative to the casing (1).

5. The indoor unit of air conditioner as claimed in claim 1, wherein the snap structure (42) comprises at least two of the snaps (422), and the slot structure (42) comprises at least two of the slots (413) disposed in one-to-one correspondence with the at least two snaps (422).

6. The indoor unit of claim 1, wherein a distance between the second end of the buckle (422) and the inner side surface of the panel on which the buckle structure (42) is located is smaller than a distance between the first end of the buckle (422) and the inner side surface of the panel on which the buckle structure (42) is located.

7. The indoor unit of claim 6, wherein the snap folding edge (421) comprises a flat edge, the snap (422) comprises a flat plate disposed on the flat edge, and an included angle between the flat edge and the flat plate disposed thereon is an acute angle.

8. The indoor unit of claim 1, wherein the snap folding edge (421) is perpendicular to the plate body where the snap structure (42) is located.

9. The indoor unit of claim 1, wherein a side of the snap folding edge (421) is attached to a side of the first slot folding edge (411).

10. The indoor unit of air conditioner as claimed in claim 1, wherein the first slot folded edge (411) is perpendicular to a plate body where the slot structure (41) is located; and/or the second slot fold (412) is perpendicular to the first slot fold (411).

11. The indoor unit of air conditioner as claimed in any one of claims 1 to 10, wherein the slot structure (41) is provided on a plate body of the casing (1), and the fastening structure (42) is provided on a plate body of the return air cover plate (2).

12. The indoor unit of air conditioner as claimed in any one of claims 1 to 10, wherein the slot structure (41) is provided on a plate of the casing (1), the snap structure (42) is provided on a plate of the return air cover plate (2), the indoor unit casing comprises more than two slot structures (41) provided on different plates of the casing (1), the snap structure (42) selectively cooperates with one of the more than two slot structures (41) to connect the return air cover plate (2) to different positions of the casing (1); or the clamping groove structure is arranged on the plate body of the return air cover plate, the buckle structures are arranged on the plate body of the casing, the indoor unit casing comprises more than two buckle structures arranged on different plate bodies of the casing, and the clamping groove structure is selectively matched with one of the more than two buckle structures so that the return air cover plate is connected to different positions of the casing.

13. Indoor unit of air conditioning according to any of claims 1 to 10, characterized in that the indoor unit casing further comprises a fixing member (3), the first side of the return air cover plate (2) is connected to the casing (1) by the snap-fit structure (4), and the second side of the return air cover plate (2) is connected to the casing (1) by the fixing member (3).

14. The indoor unit of claim 13, wherein both ends of the second side of the return air cover plate (2) are connected to the casing (1) through the fixing member (3).

15. The indoor unit of air conditioner according to any one of claims 1 to 10, wherein the slot structure (41) and the plate body on which it is located are integrally formed sheet metal parts; and/or the buckling structure (42) and the plate body on which the buckling structure is arranged are integrally formed sheet metal parts.

16. An indoor unit of an air conditioner according to any one of claims 1 to 10, wherein the indoor unit is an air duct type indoor unit.