CN216132000U - Machine and air conditioner in air conditioning - Google Patents

Abstract

The utility model relates to the technical field of air conditioners, and discloses an air conditioner indoor unit and an air conditioner, wherein the air conditioner indoor unit comprises: the air conditioner comprises a shell, wherein an air outlet is formed in the upper portion of the shell, a first air inlet is formed in the lower portion of the shell, an electric heating assembly is arranged in the shell between the first air inlet and the air outlet, and the electric heating assembly is transversely arranged in the shell. According to the air conditioner indoor unit and the air conditioner, the electric heating assembly is arranged, so that the load of an outdoor unit compressor can be reduced when the air conditioner heats, the heating effect is improved, and the heating efficiency is improved; the requirement on the compressor can be reduced, and the cost of the compressor is reduced; the first air inlet is formed in the lower portion of the shell, so that heating of air below the indoor space is enhanced, and user experience is improved; transversely establish electric heating element inside the casing, be favorable to increasing electric heating element's the area of setting up and increase electric heating element and circulating air's contact heat transfer area.

Description

Machine and air conditioner in air conditioning

Technical Field

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

Background

A heat exchanger is arranged in a shell of an existing vertical air conditioner indoor unit, wherein the heat exchanger is arranged in the shell, air subjected to heat exchange is blown out from an air outlet, and the air outlet is located on a front panel. In the use process of indoor heating of the cabinet air conditioner, a medium with higher temperature flows through the heat exchanger through the operation of the compressor in the outdoor unit, so that the indoor air is heated. Because the indoor hot air rises and gathers at the indoor top, and the indoor cold air gathers at the indoor bottom, so the existing cabinet air conditioner heating mode has the problems of long heating time, large load of the compressor and unsatisfactory heating effect when in use; especially, the heating requirement of the user cannot be met in a cold environment.

The existing air conditioner has the problems of high cost of a compressor and lower heating efficiency in operation.

SUMMERY OF THE UTILITY MODEL

The utility model provides an air conditioner indoor unit and an air conditioner, which are used for solving the problems of high cost and low heating efficiency of a compressor in the operation of the conventional air conditioner, reducing the cost of the compressor and meeting the heating requirement.

The utility model provides an air-conditioning indoor unit, comprising: the air conditioner comprises a shell, wherein an air outlet is formed in the upper portion of the shell, a first air inlet is formed in the lower portion of the shell, an electric heating assembly is arranged in the shell between the first air inlet and the air outlet, and the electric heating assembly is transversely arranged in the shell.

According to the air-conditioning indoor unit provided by the utility model, the corresponding positions of at least two sides of the electric heating assembly in the shell are connected with the mounting plates, and the edge part of the electric heating assembly is connected with the mounting plates.

According to the air conditioner indoor unit provided by the utility model, the mounting plate is provided with the through wiring hole.

According to the air conditioner indoor unit provided by the utility model, the shell is provided with an opening at a position corresponding to one side of the electric heating assembly, and the electric heating assembly is connected to the position corresponding to the opening of the shell in a drawing manner; the opening part is provided with a matched cover plate, and the cover plate is detachably connected to the shell or one side of the cover plate is rotatably connected to the shell.

According to the air-conditioning indoor unit provided by the utility model, the inner walls of the shell, which are positioned at the two sides of the opening, are respectively provided with the sliding grooves, and the two sides of the electric heating assembly are correspondingly connected with the sliding grooves at the two sides one by one.

According to the indoor unit of the air conditioner, the electric heating assembly comprises a plurality of heating elements which are arranged side by side, the heating elements are integrally connected into a whole, and a first gap is formed between every two adjacent heating elements; second gaps are respectively arranged between the heating elements positioned on the two sides and the inner wall of the machine shell.

According to the air conditioning indoor unit provided by the utility model, the heating element comprises the PTC element.

The indoor unit of the air conditioner provided by the utility model further comprises a centrifugal fan, a cross-flow fan and a heat exchanger set, wherein the centrifugal fan is arranged in the shell and corresponds to the first air inlet, and the cross-flow fan and the heat exchanger set are respectively arranged in the shell and correspond to the air outlet.

According to the air conditioner indoor unit provided by the utility model, the shell is also provided with a second air inlet at the upper part of the electric heating assembly.

The utility model also provides an air conditioner which comprises the air conditioner indoor unit.

According to the air conditioner indoor unit and the air conditioner, the electric heating assembly is arranged, so that the load of an outdoor unit compressor can be reduced when the air conditioner heats, the heating effect is improved, and the heating efficiency is improved; the requirement on the compressor can be reduced, and the cost of the compressor is reduced; the lower part of the shell is provided with the first air inlet, the electric heating assembly is arranged between the first air inlet and the air outlet, and the heating of air below the indoor space is facilitated to be enhanced, so that the heating effect is facilitated to be improved, and the user experience is improved; the electric heating assembly is transversely arranged inside the shell, so that the arrangement area of the electric heating assembly is increased, the contact heat exchange area of the electric heating assembly and circulating air is increased, the heating efficiency is improved, and the heating effect is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic view of an internal structure of an indoor unit of an air conditioner according to the present invention;

FIG. 2 is a schematic view of the connection of the electrical heating assembly provided by the present invention to a mounting plate;

fig. 3 is a schematic view of an electrical heating assembly provided by the present invention.

Reference numerals:

11: a rear guard plate; 12: a front panel; 2: an air outlet; 3: a first air inlet; 4: an electrical heating assembly; 41: a heating element; 42: a first gap; 5: a centrifugal fan; 6: a heat exchanger group; 7: a cross-flow fan; 8: mounting a plate; 81: bending the plate; 82: a wiring hole;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.

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.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

The air conditioner indoor unit and the air conditioner of the present invention will be described with reference to fig. 1 to 3.

Referring to fig. 1, a schematic side view of an internal structure of an indoor unit of an air conditioner is shown, and the present embodiment provides an indoor unit of an air conditioner, including: the air conditioner comprises a shell, wherein an air outlet 2 is formed in the upper portion of the shell, a first air inlet 3 is formed in the lower portion of the shell, an electric heating assembly 4 is arranged in the shell between the first air inlet 3 and the air outlet 2, and the electric heating assembly 4 is transversely arranged in the shell.

The air outlet 2 is arranged at the upper part of the shell, and the first air inlet 3 is arranged at the lower part of the shell. When the indoor unit of the air conditioner operates, indoor air can flow in from the first air inlet 3 at the lower part of the shell and flow out from the air outlet 2 at the upper part of the shell to form indoor air circulation so as to adjust indoor temperature. The electric heating component 4 is arranged inside the shell and between the first air inlet 3 and the air outlet 2, so that the indoor unit of the air conditioner has an electric heating function. When the air conditioner is in heating, the electric heating assembly 4 can be opened, indoor circulating air can flow through the electric heating assembly 4 to realize heat exchange and temperature rise, the temperature of the electric heating assembly 4 is fast and high, and the temperature of the indoor air can be efficiently increased.

Furthermore, the electric heating assembly 4 can reduce the load of the outdoor unit compressor when the air conditioner heats, improve the heating effect and improve the heating efficiency; and the requirement on the compressor can be reduced, and the cost of the compressor is reduced. Further, the present embodiment proposes that the electric heating element 4 is disposed horizontally inside the casing, that is, the electric heating element 4 is disposed horizontally in the indoor air circulation flowing direction, and the electric heating element 4 may be disposed perpendicular to the height direction of the casing, and may be distributed over the cross section of the casing. This mode of setting up of electric heating element 4 is convenient for install fixedly (can directly install fixedly through the casing), and is favorable to increasing electric heating element 4's the area that sets up and increase electric heating element 4 and circulating air's contact heat transfer area to be favorable to improving the efficiency of heating, guarantee the effect of heating.

Further, this embodiment specifically sets up first air intake 3 in the lower part of casing, and electric heating element 4 locates between first air intake 3 and the air outlet 2 for the air conditioner is when heating, can introduce the air admission casing of indoor below and the heat transfer of electric heating element 4, still is favorable to strengthening the heating to the air of indoor below, thereby is favorable to improving the heating effect, improves user experience.

According to the indoor unit of the air conditioner, the electric heating assembly 4 is arranged, so that the load of the compressor of the outdoor unit can be reduced when the air conditioner heats, the heating effect is improved, and the heating efficiency is improved; the requirement on the compressor can be reduced, and the cost of the compressor is reduced; the lower part of the shell is provided with the first air inlet 3, the electric heating assembly 4 is arranged between the first air inlet 3 and the air outlet 2, and the heating of the air below the indoor space is facilitated to be enhanced, so that the heating effect is facilitated to be improved, and the user experience is improved; transversely establish electric heating element 4 inside the casing, be favorable to increasing electric heating element 4 set up the area and increase electric heating element 4 and circulating air's contact heat transfer area to be favorable to improving the efficiency of heating, guarantee the effect of heating.

On the basis of the above embodiment, further, the specific installation structure of the electric heating assembly 4 inside the housing may be: the inside of casing is in the department that corresponds of at least both sides of electric heating element 4 is connected with mounting panel 8, the marginal part of electric heating element 4 connect in mounting panel 8. Or, the casing is provided with an opening at a position corresponding to one side of the electric heating component 4, and the electric heating component 4 is connected to the opening of the casing in a drawing manner.

Specifically, the present embodiment provides a mounting and fixing manner of the electric heating element 4, and referring to fig. 2, in the present embodiment, the electric heating element 4 is fixed inside the cabinet by a mounting plate 8. The mounting plate 8 can be connected with the edge part of the electric heating component 4, and then the electric heating component 4 is fixedly mounted through the connection of the mounting plate 8 and the machine shell. The edge part of the electric heating component 4 and the mounting plate 8 can be fixedly connected through screws, and can also be connected through other structures, for example, the connection and the positioning are realized through matched clamping groove convex blocks, and the specific connection structure is not limited so as to realize the purpose of fixing the electric heating component 4.

The mounting plates 8 can be connected to at least two arbitrary sides of the electric heating assembly 4 to support and fix at least two side edges of the electric heating assembly 4, so as to realize the mounting and fixing of the electric heating assembly 4. Preferably, can connect mounting panel 8 in electric heating element 4's relative both sides, carry out electric heating element 4's installation fixed, be favorable to reducing the setting quantity of mounting panel 8 and realize the firm stable support to electric heating element 4.

Further, referring to fig. 2, two ends of the mounting plate 8 may be respectively bent to connect with a bending plate 81, and the bending plate 81 is used for being connected with the casing to realize the connection and fixation of the mounting plate 8 and the casing. The board 81 of bending intersects the setting at the tip of mounting panel 8 and mounting panel 8, is certain contained angle setting, can be convenient for be connected of mounting panel 8 and casing through setting up the board 81 of bending.

Specifically, the two bending plates 81 at the two ends of the mounting plate 8 can be connected to the two opposite sides of the housing in a one-to-one correspondence. For example, the cabinet includes a front panel 12 and a rear panel 11 that are opposed, and two side walls provided between the front panel 12 and the rear panel 11; the outlet 2 and the first inlet 3 may be disposed on the front panel 12. The mounting plate 8 may be arranged perpendicular to the front panel 12, i.e. in the direction from the front panel 12 to the rear panel; the board 81 of bending of 8 one ends of mounting panel can be connected fixedly with front panel 12, and the board 81 of bending of the 8 other ends of mounting panel can be connected fixedly with backplate 11 to it is fixed to realize being connected of mounting panel 8 and casing, and then realizes that electric heating element 4's installation is fixed.

Furthermore, four upright posts can be arranged at four corners of the case, and the bent plates 81 at the end parts of the mounting plates 8 can be connected and fixed by being connected with the upright posts. The mounting plate 8 can also be arranged between two side walls of the casing, and is fixedly mounted by being connected with the side walls of the casing. The specific installation direction of the installation plate 8 and the specific connection position with the casing are not limited, so as to facilitate the installation and ensure the firm installation.

Further, the present embodiment provides another fixing manner of the electric heating element 4, and in the present embodiment, the electric heating element 4 can be installed inside the cabinet in a drawing manner. Namely, the electric heating assembly 4 is movably connected with the machine shell in a drawing way, and the electric heating assembly 4 can be installed in the machine shell or drawn out from the machine shell in a drawing way. This kind of setting mode can be convenient for electric heating element 4's installation and take out, improves the flexibility.

Specifically, two sliding grooves may be oppositely arranged on the inner walls of the opposite sides of the casing, and an opening may be arranged on the wall surface of one side between the opposite sides of the casing; the two opposite sides of the electric heating component 4 can be correspondingly inserted into the two sliding grooves one by one, and the electric heating component 4 can move along the sliding grooves; namely, the inner walls of the casing at the two sides of the opening are respectively provided with a sliding chute, and the two sides of the electric heating component 4 are correspondingly connected with the sliding chutes at the two sides one by one. Thereby realizing the drawing movement of the electric heating component 4 at the opening at one side of the shell and realizing the installation or the taking out of the electric heating component 4. The electric heating components 4 can respectively correspond to the sliding grooves on two sides of the opening and slide into the sliding grooves for installation; the electric heating component 4 can also be drawn out from the opening to realize the extraction of the electric heating component 4.

Furthermore, the opening part is provided with a matched cover plate, and the cover plate is detachably connected to the machine shell or one side of the cover plate is rotatably connected to the machine shell. The cover plate is used for shielding the opening to realize the sealing of the shell. The cover plate can be detachably connected to the corresponding position of the opening of the shell through screws and the like, and the opening is shielded or opened. The cover plate can also be rotatably connected to the opening of the shell at one side through a pin shaft, a hinge and other structures, the opening or closing of the opening is realized through rotation, and the structure is similar to the opening and closing structure of the door body.

Further, the sliding groove can be a U-shaped groove, and the distance between the groove walls at the two sides is adapted to the thickness of the electric heating component 4. The notches of the two sliding grooves on the inner walls of the two opposite sides of the machine shell are oppositely arranged, so that the electric heating component 4 can be conveniently inserted. In other embodiments, the chute may have other structures to fix the electric heating assembly 4 and move the electric heating assembly 4, and is not limited in particular.

In one embodiment, a through opening may be formed on the rear protection plate 11 of the casing corresponding to the electric heating element 4, and correspondingly, sliding grooves are respectively formed on the inner sides of the two side walls of the casing, so that the electric heating element 4 can be drawn out from the rear opening of the casing. In other examples, the opening may be provided on a side wall of the casing or on the front panel 12, which is not limited in particular.

Further, the electric heating component 4 is connected at the opening of the machine shell in a drawing mode, and the electric heating component 4 can be taken out conveniently by the aid of the installation mode, so that the electric heating component 4 can be maintained and replaced conveniently. And the electric heating component 4 can be taken out when the air conditioner refrigerates, so that the blockage to the flow of the air flow is reduced, the flow of the air flow during refrigeration is ensured, and the refrigeration effect is ensured.

On the basis of the above embodiment, further, referring to fig. 2, when the electric heating assembly 4 is fixedly installed through the installation plate 8, the installation plate 8 is provided with a wire hole 82 therethrough. Specifically, the mounting plate 8 has a wire hole 82 formed therethrough at a position corresponding to the outside of the electric heating element 4. The mounting plate 8 corresponds to a portion of the electric heating element 4, that is, a portion where the mounting plate 8 contacts the electric heating element 4 to support the electric heating element 4. The mounting plate 8 corresponds to a portion outside the electric heating element 4, that is, a portion supported without contacting the electric heating element 4. The wiring hole 82 penetrates through the mounting plate 8, and can be used for a wire harness such as a wire of the electric heating assembly 4 to pass through, so that the wire harness such as the wire can be conveniently mounted and connected. The mounting plate 8 can also be provided with a wiring groove and other structures for the lead to pass through and be arranged.

Furthermore, the mounting plate 8 can be connected with a wire clamp; for fixing wire harnesses such as wires. The specific arrangement positions and the number of the wiring holes 82 and the wire clamps are not limited.

Furthermore, when the electric heating component 4 is connected with the casing through the sliding groove in a pulling manner, the wall of the sliding groove can be provided with a wiring groove and other structures, so that the wires can be conveniently arranged in a penetrating manner. The wiring groove penetrates through the groove wall and is positioned on one side of the opening of the sliding groove.

On the basis of the above embodiment, further, referring to fig. 3, the electric heating assembly 4 includes a plurality of heating elements 41 arranged side by side, the plurality of heating elements 41 are integrally connected into a whole, and a first gap 42 is provided between two adjacent heating elements 41; second gaps are respectively arranged between the heating elements 41 on the two sides and the inner wall of the machine shell. The first gap 42 and the second gap are provided for the circulation air to flow through, ensuring smooth flow of the circulation air and enhancing contact heat exchange of the circulation air with the heating element 41.

Referring to fig. 2, the electric heating assembly 4 in the present embodiment includes four heating elements 41 arranged side by side, and three first gaps 42 are formed between the four heating elements 41. Taking the orientation shown in fig. 2 as an example, second gaps are formed between the two heating elements 41 located at the uppermost and the lowermost positions and the corresponding inner walls of the casing, respectively. In other embodiments, the number of the heating elements 41 may be other, and is not limited.

On the basis of the above embodiment, further, the heating element 41 includes a PTC element. The electrical heating component 4 in this embodiment may be a PTC electrical heating assembly.

On the basis of the above embodiment, further referring to fig. 1, the indoor unit of an air conditioner further includes a centrifugal fan 5, a cross-flow fan 7 and a heat exchanger set 6, where the centrifugal fan 5 is disposed in the casing and corresponds to the first air inlet 3, and the cross-flow fan 7 and the heat exchanger set 6 are respectively disposed in the casing and corresponds to the air outlet 2.

The air-conditioning indoor unit is suitable for a cabinet air conditioner. The centrifugal fan 5 is disposed below the electric heating module 4, and introduces indoor air from the first air inlet 3 and blows the introduced indoor air upward toward the electric heating module 4. The centrifugal fan 5 is arranged to ensure the flow rate of the circulating air, thereby ensuring the operation effect of the air conditioner. The cross-flow fan 7 is arranged above the electric heating component 4 and used for driving the circulating air to be blown out from the air outlet 2 and driving the circulating air to contact with the heat exchanger group 6 for heat exchange. The heat exchanger group 6 is a heat exchanger of a conventional indoor unit of an air conditioner and is used for being connected with a heat exchanger of an outdoor unit to form a refrigerant loop.

Further, fig. 1 is a simple schematic diagram of the air conditioning indoor unit, and is used to show the approximate arrangement positions of the components of the indoor unit, and the specific arrangement structure of the components is not limited.

On the basis of the above embodiment, further, the casing is further provided with a second air inlet at a position above the electric heating assembly 4. The present embodiment proposes that a second air inlet may be further provided on the housing, and the second air inlet is located at an upper portion of the electric heating assembly 4. That is, when the second air inlet is opened, the air flowing in from the second air inlet may not need to flow through the electric heating element 4, so that the part of the air flow is not blocked by the electric heating element 4, and the air flow rate can be ensured.

Specifically, the second air inlet can be opened when the air conditioner is in refrigeration; so that the air inlet is not blocked by the electric heating component 4, and the air flow is ensured. The second air inlet can be closed when the air conditioner is in heating to make the air inlet get into from first air inlet 3, make the air current all flow out after fully contacting the heat transfer with electric heating element 4, guarantee the effect of heating.

Further, the second air inlet may be disposed on the rear protection plate 11 of the casing, or may be disposed on a side wall of the casing, which is not limited specifically.

On the basis of the foregoing embodiments, further, the present embodiment provides an air conditioner including the air conditioning indoor unit according to any of the foregoing embodiments. The air conditioner also comprises an outdoor unit, wherein a compressor and an outdoor heat exchanger are arranged in the outdoor unit.

Further, the electric heating component 4 of the air conditioner is used for being closed during cooling and being opened during heating; the compressor is used for being opened when refrigerating and closed when heating. That is, the compressor is used only for cooling, and only heats by the electric heating assembly 4 when heating. The single refrigeration of the compressor can be realized by arranging the electric heating component 4, and the single refrigeration compressor can be adopted, so that the cost of the compressor is reduced.

On the basis of the above embodiment, further, considering that the compressor of the outdoor unit of the air conditioner needs to work both in heating and cooling, the cost is high; in the embodiment, the compressor adopts a single refrigeration compressor, and the cost of the compressor is low. Specifically, this embodiment is through setting up electric heating element 4 at the air conditioning indoor set, and in the refrigerated time of summer, electric heating unit is out of work, and the off-premises station work, centrifugal fan and cross flow fan 7 begin to work and induced draft, and after the heat transfer of heat exchanger group 6, cold wind discharges from air outlet 2 behind cross flow fan 7. In winter, the electric heating unit starts to work, the outdoor unit does not work, the centrifugal fan starts to work to suck air, and after heat exchange of the electric heating unit, hot air is discharged from the air outlet 2 after passing through the cross flow fan 7.

The embodiment realizes the air conditioner structure of refrigerating in summer and heating in winter. Compare outer machine of current air conditioner and all need work summer and winter, the compressor is with high costs. The air conditioner provided by the embodiment realizes the operation refrigeration of the air conditioner outdoor unit in summer, the air conditioner outdoor unit does not work in winter, and only the indoor unit electric heating unit works.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed 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 two or more unless specifically defined otherwise.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. An indoor unit of an air conditioner, comprising: the air conditioner comprises a shell, wherein an air outlet is formed in the upper portion of the shell, a first air inlet is formed in the lower portion of the shell, an electric heating assembly is arranged in the shell between the first air inlet and the air outlet, and the electric heating assembly is transversely arranged in the shell.

2. An indoor unit of an air conditioner according to claim 1, wherein mounting plates are attached to the inside of the casing at positions corresponding to at least two sides of the electric heating unit, and edge portions of the electric heating unit are attached to the mounting plates.

3. An indoor unit of an air conditioner according to claim 2, wherein the mounting plate is provided with a wiring hole therethrough.

4. An indoor unit of an air conditioner according to claim 1, wherein the casing is provided with an opening at a position corresponding to one side of the electric heating unit, and the electric heating unit is connected to the opening of the casing in a drawing manner; the opening part is provided with a matched cover plate, and the cover plate is detachably connected to the shell or one side of the cover plate is rotatably connected to the shell.

5. An indoor unit of an air conditioner as claimed in claim 4, wherein sliding grooves are respectively formed on inner walls of the casing on both sides of the opening, and both sides of the electric heating unit are connected with the sliding grooves on both sides in a one-to-one correspondence manner.

6. An indoor unit of an air conditioner as claimed in any one of claims 1 to 5, wherein the electric heating assembly comprises a plurality of heating elements arranged side by side, the plurality of heating elements are integrally connected into a whole, and a first gap is arranged between two adjacent heating elements; second gaps are respectively arranged between the heating elements positioned on the two sides and the inner wall of the machine shell.

7. An indoor unit of an air conditioner according to claim 6, wherein the heating element includes a PTC element.

8. An indoor unit of an air conditioner as claimed in any one of claims 1 to 5, further comprising a centrifugal fan, a cross flow fan and a heat exchanger set, wherein the centrifugal fan is disposed in the casing corresponding to the first air inlet, and the cross flow fan and the heat exchanger set are respectively disposed in the casing corresponding to the air outlet.

9. An indoor unit of an air conditioner as claimed in claim 8, wherein the casing is further provided with a second air inlet at a position above the electric heating unit.

10. An air conditioner characterized by comprising the indoor unit of an air conditioner according to any one of claims 1 to 9.

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