CN215675515U

CN215675515U - Indoor unit of air conditioner

Info

Publication number: CN215675515U
Application number: CN202121269824.0U
Authority: CN
Inventors: 丁毅
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-01-28
Anticipated expiration: 2031-06-07

Abstract

The utility model discloses an air-conditioning indoor unit, which comprises: a housing; fresh air module, fresh air module sets up in the casing at least partially, and fresh air module includes: an air duct member; and the heating device is arranged to be used for heating the gas flowing through the fresh air module, and the longitudinal two ends of the heating device are respectively connected with the air duct component in a positioning manner. According to the air-conditioning indoor unit provided by the embodiment of the utility model, the heating device is arranged and is used for heating the gas flowing through the fresh air adding module, so that the temperature of the fresh air entering the indoor space is prevented from being too low, the visual feeling of a user is improved, the comfort is improved, and the use experience of the air-conditioning indoor unit is improved.

Description

Indoor unit of air conditioner

Technical Field

The utility model relates to the technical field of air conditioners, in particular to an indoor unit of an air conditioner.

Background

In the related art, the fresh air module is used for introducing air from the outside to the inside, and the temperature and humidity of the outdoor fresh air may be different from the temperature or humidity line of the indoor space by a large amount, for example: under the cold weather in north, the lower outdoor air of temperature enters into indoorly, can cause chilly health impression for the user, reduces and uses experience.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the utility model aims to provide an indoor unit of an air conditioner, which can heat fresh outdoor air and improve the use experience.

An air conditioning indoor unit according to an embodiment of the present invention includes: a housing; fresh air module, fresh air module sets up in the casing at least partially, and fresh air module includes: an air duct member; and the heating device is arranged to be used for heating the gas flowing through the fresh air module, and the longitudinal two ends of the heating device are respectively connected with the air duct component in a positioning manner.

According to the air-conditioning indoor unit provided by the embodiment of the utility model, the heating device is arranged and is used for heating the gas flowing through the fresh air adding module, so that the temperature of the fresh air entering the indoor space is prevented from being too low, the visual feeling of a user is improved, the comfort is improved, and the use experience of the air-conditioning indoor unit is improved.

According to some embodiments of the utility model, at least one of the longitudinal ends of the heating device is further connected to the air duct member by a fastener.

In some embodiments, the first longitudinal end of the heating device is provided with a first positioning portion, the air duct component is provided with a second positioning portion, and the first positioning portion is nested and positioned in cooperation with the second positioning portion.

Further, the first positioning portion is configured as a positioning pin extending upward from the top of the heating device, and the second positioning portion is configured as a positioning sleeve into which the positioning pin is inserted.

According to some embodiments of the present invention, a third positioning portion is disposed at a second longitudinal end of the heating device, and a fourth positioning portion is disposed on the air duct member, and the third positioning portion and the fourth positioning portion are inserted and positioned.

Further, the third positioning portion is a protruding block extending downwards from the bottom of the heating device, the fourth positioning portion is a positioning groove, and the protruding block is inserted into the positioning groove.

Further, the positioning groove includes: a first groove portion extending in a first direction and a second groove portion extending in a second direction, the first groove portion communicating with the second groove portion, the first direction being different from the second direction; the bump includes: the first lug is connected with the second lug, the first lug is inserted into the first groove part, and the second lug is inserted into the second groove part.

In some embodiments, the tab is further secured to the detent by a fastener.

Furthermore, the fastener is fixed with the lug after wearing to establish the constant head tank from the back that deviates from the lug of constant head tank.

According to some embodiments of the utility model, the heating device is mounted at the air inlet of the air duct component and the heating device spans the air inlet.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a partial schematic view of a fresh air module according to an embodiment of the present invention;

FIG. 2 is a schematic view of an angle at which the air duct assembly of the fresh air module cooperates with the heating device according to an embodiment of the present invention;

FIG. 3 is a schematic view of another angle at which the air duct assembly of the fresh air module cooperates with the heating device according to an embodiment of the present invention;

FIG. 4 is a schematic view of a duct assembly of a fresh air module according to an embodiment of the present invention;

FIG. 5 is a partial enlarged view of area A in FIG. 4;

FIG. 6 is a schematic view of a fourth positioning portion of the air duct assembly of the fresh air module cooperating with a third positioning portion of the heating device according to the embodiment of the utility model;

FIG. 7 is a schematic, broken away view of a fresh air module according to an embodiment of the utility model;

fig. 8 is a schematic view of an air conditioning indoor unit according to an embodiment of the present invention.

Reference numerals:

an indoor unit 1000 of an air conditioner,

a fresh air module 100, a shell 200, a purification module 300, a humidification module 400, an air duct component 500, a heat exchange component 600, an air outlet frame component 700,

an air duct assembly 10, a second positioning portion 11, a fourth positioning portion 12, a first groove portion 121, a second groove portion 122, an air inlet 13, a fresh air duct 14, a fresh air fan 15, an air guide frame 16,

a heating device 20, a first positioning portion 21, a third positioning portion 22, a first bump 221, a second bump 222,

a fresh air pipe 30, a fresh air joint 40, a first protective net 50, a second protective net 60,

a front panel 210, a rear box 220, a top cover 230 and a bottom plate 240.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

An air conditioning indoor unit 1000 according to an embodiment of the present invention will be described with reference to fig. 1 to 8.

As shown in fig. 1, 2 and 3, an air conditioning indoor unit 1000 according to an embodiment of the present invention includes: a housing 200, a fresh air module 100 and a heating device 20.

As shown in fig. 8, the indoor unit 1000 of an air conditioner of the present invention may be configured as an upright type indoor unit, a vertical hanging type indoor unit, or the like, and the casing 200 defines an accommodating space, and the casing 200 includes: the air conditioner comprises a front panel 210, a rear box 220, a top cover 230 and a chassis 240, wherein an accommodating space is defined by the shell 200, part of a fresh air module 100 is arranged in the accommodating space and is located below the accommodating space, a purification module 300 and a humidification module 400 are further arranged above the fresh air module 100, an air duct component 500 is arranged above the humidification module 400, a heat exchange component 600 is arranged on the rear side of the air duct component 500, and an air outlet frame component 700 is arranged between the air duct component 500 and the front panel 210.

The fresh air module 100 is communicated with the outdoor space through the drawn fresh air pipe 30 and the fresh air joint 40, the fresh air module 100 is provided with an air duct assembly 10, and the air duct assembly 10 is formed into a shell of the fresh air module 100 and defines a fresh air duct 14.

The fresh air module 100 is used for introducing fresh air from the outside to the inside, so that at least part of the fresh air module 100 is located in the casing 200, and the other part of the fresh air module extends out of the outdoor space, so that the fresh air introduced into the outdoor space is introduced into the indoor unit 1000 of the air conditioner.

As shown in fig. 7, the air duct assembly 10 includes: the fresh air fan 15 can be constructed as any one of a centrifugal fan, a cross flow fan or an axial flow fan, and is used for sucking air in an outdoor space to the indoor space, the fresh air fan 15 is arranged in the fresh air duct 14, the air duct assembly 10 actually forms a shell of the fresh air module 100 and is connected with the air guide frame 16, the air guide frame 16 is communicated with the outdoor space through a fresh air duct 30 and a fresh air joint 40, the heating device 20 is arranged between the air guide frame 16 and the fresh air fan 15, a first protective net 50 is arranged between the heating device 20 and the air guide frame 16, and a second protective net 60 is arranged above the fresh air component 10.

It can be understood that the air duct assembly 10 defines a fresh air duct 14, the fresh air duct 14 is communicated with the outdoor space, when the air-conditioning indoor unit 1000 is switched to a fresh air mode or air needs to be introduced into the indoor space from the outdoor space, the outdoor air is introduced into the air-conditioning indoor unit 1000 through the fresh air duct 14, and in the cold weather in the north, the temperature reduction introduced into the air can reduce the user experience, so that the intuitive feeling of cold and hot is generated.

Based on this, the present invention further provides a heating device 20 in the fresh air module 100, the heating device 20 is configured to heat the air flowing through the fresh air module 100, and the longitudinal ends of the heating device 20 are respectively connected with the air duct component 10 in a positioning manner.

That is to say, wind channel subassembly 10 has injectd new trend wind channel 14, and heating device 20's both ends are fixed on wind channel subassembly 10, heating device 20 is located new trend wind channel 14 promptly, in order by outdoor induction air, and outdoor air be when gas temperature is lower, can open heating device 20, heat the new trend through heating device 20, it is reasonable to ensure the temperature that enters into the new trend of indoor space, in order to avoid the user to produce the visual impression of neglecting cold and neglecting hot, improve the use experience of indoor set 1000 of air conditioner.

It should be noted that, the heating device 20 is configured to heat the gas flowing through the fresh air module 100 means that the heating device 20 is disposed in the air inlet 13, the air outlet or the fresh air duct 14 of the fresh air duct 14, so as to directly heat the air entering from the outdoor space in the process of supplementing fresh air, the heating effect is stable and reliable, the longitudinal ends of the heating device 20 are respectively connected with the air duct component 10 in a positioning manner, that is, the upper and lower ends of the heating device 20 are positioned prior to the air duct component 10 and are fixed after being positioned, and the installation accuracy and the fixing stability of the heating device 20 on the air duct component 10 can be improved.

According to the air-conditioning indoor unit 1000 of the embodiment of the utility model, by arranging the heating device 20 and enabling the heating device 20 to be used for heating the air flowing through the fresh air adding module 100, the temperature of the fresh air entering the indoor space is prevented from being too low, the visual feeling of a user is improved, the comfort is improved, and the use experience of the air-conditioning indoor unit 1000 is improved.

It should be noted that, in some embodiments, the longitudinal ends of the heating device 20 are fixed to the upper and lower sidewalls of the air duct assembly 10, that is, the heating device 20 extends along the height direction of the air duct assembly 10; in other embodiments, the longitudinal ends of the heating device 20 are fixed to the left and right side walls of the air duct assembly 10, that is, the heating device 20 extends along the left and right direction of the air duct assembly 10; of course, the heating device 20 may longitudinally correspond to the extending direction of the fresh air duct 14 of the air duct assembly 10, that is, the heating device 20 extends into the fresh air duct 14 and may be fixed on the inner wall of the fresh air duct 14.

As shown in fig. 3, according to some embodiments of the present invention, at least one of the longitudinal ends of the heating device 20 is further connected to the air duct assembly 10 by a fastener.

In other words, the air duct assembly 10 is generally a frame structure, the middle area of the frame structure defines an air inlet duct, the edge area of the frame structure is used for fixing with the casing 200 of the air conditioner indoor unit 1000, and further, fastener through holes can be formed in the edge area of the frame structure, threaded holes are formed in the bases at the two longitudinal ends of the heating element, and after the fastener through holes are penetrated by the fastener, the fastener is in threaded fit with the threaded holes, so that the fixing stability of the heating device 20 on the air duct assembly 10 can be further improved through the fastener while the stable fixing of the heating device 20 on the air duct assembly 10 is realized.

In the specific embodiment shown in fig. 1, a first longitudinal end of the heating device 20 is provided with a first positioning portion 21, the air duct assembly 10 is provided with a second positioning portion 11, and the first positioning portion 21 is nested and positioned in cooperation with the second positioning portion 11.

Specifically, in some embodiments, the first positioning portion 21 is configured as a positioning pin extending upward from the top of the heating device 20, the second positioning portion 11 is configured as a positioning sleeve, and the positioning pin is inserted into the positioning sleeve to realize a nested positioning fit, and in other embodiments, the first positioning portion 21 is configured as a positioning sleeve, and the second positioning portion 11 is configured as a positioning pin formed on the frame of the air duct assembly 10, and the positioning pin is further in a plug-in fit with the positioning sleeve to realize the positioning and fixing of the longitudinal first end of the heating device 20 on the air duct assembly 10.

It can be understood that, in the embodiment in which the positioning sleeve is formed on the frame of the air duct assembly 10, the positioning sleeve may be embedded in the frame of the air duct assembly 10, or may protrude from the surface of the frame of the air duct assembly 10, the positioning sleeve may be configured to be convex, a positioning hole matched with the positioning pin is formed in the middle area of the convex, and through the arrangement of the convex, the above positioning and fixing can be realized, and the structural strength of the air duct assembly 10 can be improved.

Meanwhile, as shown in fig. 1 and 2, the length of the positioning pin formed at the longitudinal first end of the heating device 20 may be slightly greater than the depth of the positioning hole of the positioning sleeve, so that the interference between the base of the heating device 20 at the longitudinal first end and the air duct assembly 10 may be avoided, the assembly convenience may be improved, and a part of assembly errors may be absorbed, thereby improving the assembly convenience.

As shown in fig. 1, according to some embodiments of the present invention, a third positioning portion 22 is disposed at a second longitudinal end of the heating device 20, a fourth positioning portion 12 is disposed on the air duct assembly 10, and the third positioning portion 22 is inserted into and positioned with the fourth positioning portion 12.

Specifically, the third positioning portion 22 is configured as a projection extending downward from the bottom of the heating device 20, and the fourth positioning portion 12 is configured as a positioning groove, and the projection is inserted into the positioning groove.

That is to say, the base of the longitudinal second end of the heating device 20 is provided with a convex block, the frame corresponding to the air duct assembly 10 is correspondingly provided with a groove matched with the convex block, the groove is formed into a positioning groove, the positioning groove is in insertion fit with the convex block, so that in the process of assembling the heating device 20 to the air duct assembly 10, the positioning pin of the longitudinal first end is inserted into and positioned by the positioning sleeve, and then the convex block of the longitudinal second end is in insertion fit with the positioning groove, so as to fix the heating device 20 on the air duct assembly 10.

It can be understood that, in other embodiments, the fourth positioning portion 12 on the air duct component 1 is configured as a protrusion, the corresponding third positioning portion 22 at the second longitudinal end of the heating device 20 is configured as a positioning groove matched with the protrusion, one side of the positioning groove is opened to form an assembly opening, during the assembly process, the positioning pin and the positioning sleeve are inserted and positioned first, and then the protrusion passes through the assembly hole to extend into the positioning groove, so as to realize the fixed connection between the second longitudinal end of the heating device 20 and the air duct assembly 10.

It should be noted that, in some embodiments, the positioning hole formed on the protrusion (i.e., the positioning sleeve) defining the second positioning portion 11 by the air duct assembly 10 is a blind hole, in other embodiments, the positioning hole on the positioning sleeve of the air duct assembly 10 is a through hole, and in addition, the positioning hole may be configured as a non-circular hole (e.g., a rectangular hole, a hexagonal hole, a triangular hole, etc.), and the positioning hole can be used for positioning and fixing in the assembling process, and effectively limiting, so as to prevent the heating device 20 from moving or shaking when bearing fresh air flow, so as to prevent the air-conditioning indoor unit 1000 from generating abnormal sound in the working process, and further improve the use experience of the air-conditioning indoor unit 1000.

As shown in fig. 4 and 5, the positioning groove includes: a first groove 121 extending in a first direction and a second groove 122 extending in a second direction, the first groove 121 and the second groove 122 communicating with each other, the first direction being different from the second direction; the bump includes: the first protrusion 221 extends along the first direction and the second protrusion 222 extends along the second direction, the first protrusion 221 is connected with the second protrusion 222, the first protrusion 221 is inserted into the first slot 121, and the second protrusion 222 is inserted into the second slot 122.

It can be understood that the first protrusion 221 and the second protrusion 222 may be connected to each other to form a "T" shaped block, an "x" shaped block, or a "+" shaped block, the corresponding first groove portion 121 and the second groove portion 122 are communicated with each other to define a "T" shaped groove, an "x" shaped groove, or a "+" shaped groove, and the third positioning portion 22 is matched with the fourth positioning portion 12, so as to improve the fixing stability of the heating device 20 on the air duct assembly 10, and meanwhile, the matching of the third positioning portion 22 and the fourth positioning portion 12 has a certain limiting effect, so as to avoid the heating device 20 from shaking during the working process, prolong the service life, avoid the abnormal sound during the working process, and improve the use experience.

In other embodiments, the first protrusion 221 and the second protrusion 222 may not be connected but extend toward the first direction and the second direction, respectively, the first groove 121 and the second groove 122 are not connected but extend toward the first direction and the second direction, respectively, so that the first protrusion 221 is inserted into the first groove 121, and the second protrusion 222 is inserted into the second groove 122, so as to improve the fixing stability of the heating device 20 on the air duct assembly 10.

That is, in some embodiments, the first direction and the second direction are perpendicular to each other, and in other embodiments, the first direction and the second direction form an included angle (obtuse angle or acute angle) so that the first protrusion 221 is engaged with the first groove 121, and the second protrusion 222 is engaged with the second groove 122, so as to limit the fixing of the heating device 20 and the air duct assembly 10 in two directions, which can further improve the connection stability of the heating device 20 and the air duct assembly 10.

Referring to fig. 6, the protruding lengths of the first projection 221 and the second projection 222 relative to the base of the longitudinal second end of the heating device 20 may be different, for example: in some embodiments, the first projection 221 has a greater projection length than the second projection 222; in other embodiments, the protruding length of the second protrusion 222 is greater than that of the first protrusion 221, so that better positioning and fixing effects can be achieved.

In some embodiments, the tab is further secured to the detent by a fastener.

That is to say, set up the fastener via hole on the diapire of constant head tank, correspond on the lug and set up the screw hole, wear to locate the fastener of fastener via hole and the screw hole screw-thread fit on the lug to further improve the fixed stability of heating device 20 on wind channel subassembly 10.

Furthermore, it should be noted that in some embodiments, threaded holes are provided on the positioning pins at the first longitudinal end of the heating device 20 and the protrusions at the second longitudinal end, and corresponding threaded hole through holes opposite to the threaded holes are provided on the frame structure of the air duct assembly 10, so that the first longitudinal end and the second longitudinal end of the heating device 20 are fixed to the air duct assembly 10 by fasteners, and in other embodiments, the first longitudinal end or the second longitudinal end is fixed to the air duct member 10 by fasteners.

It is understood that the passing of the fastener through the threaded hole via to secure with the lug means: the fastener is fixed with the lug after penetrating the constant head tank from the back (the opposite side of the diapire of constant head tank) that deviates from the lug of constant head tank.

Preferably, the portion of the air duct assembly 10 forming the positioning groove and the portion forming the positioning sleeve all protrude out of the circumferential surface of the air duct assembly 10, that is, when the longitudinal direction of the heating device 20 corresponds to the left and right directions of the air duct assembly 10, the positioning sleeve protrudes out of the left inner surface of the air duct assembly 10, the positioning groove protrudes out of the right inner surface of the air duct assembly 10, when the longitudinal direction of the heating device 20 corresponds to the height direction of the air duct assembly 10, the positioning sleeve protrudes out of the upper inner surface of the air duct assembly 10, and the positioning groove protrudes out of the lower inner surface of the air duct assembly 10.

In the particular embodiment shown in FIG. 2, according to some embodiments of the present invention, the heating device 20 is mounted at the intake vent 13 of the air duct assembly 10 and the heating device 20 spans the intake vent 13.

In other words, air intake 13 of wind channel subassembly 10 is arbitrary one kind circular, the rectangle, heating device 20 sets up on air intake 13 region, and heating device 20 extends along the direction of height or left and right sides direction of wind channel subassembly 10, heating device 20 is used for carrying out the part that heats with the air intake 13 of new trend wind channel 14 just right, with the heating effect that improves heating device 20, ensure under the cold weather in the north, the gas that enters into indoor can be by the effectual heating of heating device 20, with the use experience of improvement air conditioning indoor set 1000, avoid the user to produce the use of neglecting cold and neglecting hot feeling, improve the travelling comfort.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. An indoor unit of an air conditioner, comprising:

a housing;

fresh air module, fresh air module sets up at least partially in the casing, fresh air module includes: an air duct assembly;

and the heating device is arranged to heat the gas flowing through the fresh air module, and the longitudinal two ends of the heating device are respectively connected with the air duct component in a positioning manner.

2. An indoor unit of an air conditioner according to claim 1, wherein at least one of both longitudinal ends of the heating unit is further connected to the air duct member by a fastening member.

3. An indoor unit of an air conditioner according to claim 1, wherein a first positioning portion is provided at a first longitudinal end of the heating device, a second positioning portion is provided on the air duct assembly, and the first positioning portion and the second positioning portion are nested and positioned in cooperation.

4. An indoor unit of an air conditioner according to claim 3, wherein the first positioning portion is configured as a positioning pin extending upward from a top of the heating device, and the second positioning portion is configured as a positioning bush into which the positioning pin is inserted.

5. An indoor unit of an air conditioner as claimed in claim 1, wherein a third positioning portion is provided at a second longitudinal end of the heating device, a fourth positioning portion is provided on the air duct assembly, and the third positioning portion and the fourth positioning portion are inserted and positioned.

6. An indoor unit of an air conditioner according to claim 5, wherein the third positioning portion is configured as a projection extending downward from a bottom of the heating unit, and the fourth positioning portion is configured as a positioning groove into which the projection is inserted.

7. An indoor unit of an air conditioner according to claim 6, wherein the positioning groove includes: a first groove portion extending in a first direction and a second groove portion extending in a second direction, the first groove portion communicating with the second groove portion, the first direction being different from the second direction; the bump includes: the first lug extends along the first direction and the second lug extends along the second direction, the first lug is connected with the second lug, the first lug is inserted into the first groove part, and the second lug is inserted into the second groove part.

8. An indoor unit of an air conditioner according to claim 5, wherein the projection is further fixed to the positioning groove by a fastener.

9. An indoor unit of an air conditioner according to claim 8, wherein the fastener is fixed to the projection after passing through the positioning groove from a back surface of the positioning groove facing away from the projection.

10. An indoor unit of an air conditioner according to claim 1, wherein the heating unit is installed at an air inlet of the air duct assembly and spans the air inlet.